BPTC Chi Tiet Doan C-D

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 PhÇn I : Giíi thiÖu chung I/ Giíi thiÖu chung. - Gãi th Çu 2.1 c¶ i t¹o n©n g cÊp CSHT cÊp 1 tuy Õn !ng "n #i h ¶i $% &'ng Ch() h%ng n* t+,n &) %n u0n , Ch©n Th%nh ph H¶i 3h4ng )o g5 6 HÖ thng tho7t níc cng h8p $% !ng h9: T+¹ !: CÊp níc: ;'ng gi)o th<ng: =>i &? @A < t<: ;iÖn chiÕu B7ng: C©y @)nh - ChD &Çu t 6 =)n u¶n EF ©ng cÊ p &< th H¶i 3h4ng. - ;!n $ thiÕt Õ6 T $Ên =E)c J A)tch IntA+ n)tion)E K=JIL - T $Ên gi7 B7t6 ouiB =A+ gA+ G+oup: i ppon # oAi co: EtM N $iO)BA. - h % thÇu thi c<n g6 i, n M)nh C<ng ty cP phÇ n 3h7t t+i ?n Q thu0t R©y Mn g H% 8i $% TPng c<ng ty &Çu t @©y Mn g $% cÊp tho7 t níc <i t+'ng JiÖt ). - C<n g t+n h &> &Uc h9i c<n g @©y M ng 2V th 7ng 2 nW 2XXY. II/C! B9 E0p tP chZc thi c<ng. - CWn cZ $%o h5 B! 'i thÇu c(ng c7c ti,u chu[n: ch\ M]n: y,u cÇu Q thu0t $% ti,n EUng ^ thAo. - CWn cZ $%o h5 B! thiÕt Õ Q thu0t Mo BVI E0p. - CWn cZ &i_u iÖn &) hnh: &) chÊt thDy $Wn $% th'i tiÕt thc tÕ t¹i hu $c thi c<ng. - CWn cZ Õt u¶ th[ &nh B Y`a/GTCC-T;Rb ng%y 1 th7ng nW 2XX cD) S9 Gi)o th<ng J0n t¶i H¶i 3h4ng $_ $iÖc ;i_u ch\nh P Bung iÖn ph7p thi c<ng gi) c th%nh h &%o tuyÕn cng h8p ,nh "n #i H¶i. - CWn cZ $%o nh% cung cÊp $0t EiÖu $% h¶ nWng cung Zng cho c<ng t+nh. - CWn cZ $%o h¶ nWng $_ @A 7y thiÕt $% inh nghiÖ thi c<ng t+ong nhi_u nW u) &i $íi nhdng c<ng t+nh cã y,u cÇu Q thu0t t!ng t. - CWn cZ $%o c7c ui t+nh ui ph¹ hiÖn h%nh $_ thi c<ng $% nghiÖ thu c<ng t+nh. III/ ;ec &i? tuyÕn thi c<ng - ;o¹n n%y M%i ho¶ng aYX fo M%i t cui h5 b H%ng K&i? CL &Õn &'ng guyn JWn inh K&i? bL thu8c u¶n EF cD) ph'ng 6 b H%ng #,nh. - ThAo h5 B! h¶o B7t nW 2XXa: et *ng t nhi,n cD) ,nh $íi c)o &8 t+ung nh t 2:V &Õn 2:Y. S)u hi nh0n %n gi)o et *ng: h% thÇu &> tiÕn h%nh c<ng t7c h¶o B7t &) hnh $% &) chÊt P @ung Kth7ng V/2XXYL: hiÖn t+¹ng et *ng cD) h)i ,n ' ,nh &> cã Page 1

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Transcript of BPTC Chi Tiet Doan C-D

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Phn I : Gii thiu chung

I/ Gii thiu chung. Gi thu 2.1 ci to nng cp CSHT cp 1 tuyn mng An Kim hi v ng Cha hng nm trn a bn qun L Chn Thnh ph Hi Phng bao gm : H thng thot nc cng hp v mng h, Trm bm, Cp nc, ng giao thng, Bi xe t, in chiu sng, Cy xanh

Ch u t : Ban qun l Nng cp th Hi Phng.

n v thit k: T vn Black & Veatch International (BVI)

T vn gim st: Louis Berger Group, Nippon Koei co, ltd viwase.

Nh thu thi cng: Lin danh Cng ty c phn Pht trin k thut Xy dng H Ni v Tng cng ty u t xy dng v cp thot nc mi trng Vit Nam.

Cng trnh c khi cng xy dng 25 thng 2 nm 2007.

II/C s lp t chc thi cng. Cn c vo h s mi thu cng cc tiu chun, ch dn, yu cu k thut v tin lng km theo.

Cn c vo h s thit k k thut do BVI lp. Cn c iu kin a hnh, a cht thy vn v thi tit thc t ti khu vc thi cng.

Cn c kt qu thm nh s 734/GTCC-TXD ngy 1 thng 8 nm 2008 ca S Giao thng Vn ti Hi Phng v vic iu chnh b sung bin php thi cng gia c thnh h o tuyn cng hp knh An Kim Hi.

Cn c vo nh cung cp vt liu v kh nng cung ng cho cng trnh.

Cn c vo kh nng v xe my thit b v kinh nghim thi cng trong nhiu nm qua i vi nhng cng trnh c yu cu k thut tng t.

Cn c vo cc qui trnh qui phm hin hnh v thi cng v nghim thu cng trnh.

III/ c im tuyn thi cng- on ny di khong 470 m ko di t cui h D Hng (im C) n ng Nguyn Vn Linh (im D) thuc qun l ca phng : D Hng Knh.- Theo h s kho st nm 2004, mt bng t nhin ca knh vi cao trung bnh t +2,5m n +2,7m. Sau khi nhn bn giao mt bng, Nh thu tin hnh cng tc kho st a hnh v a cht b xung (thng 5/2007), hin trng mt bng ca hai bn b knh c nhiu thay i vi cao bnh qun mc +3,3m, phn ln l do lng ph thi xy dng do nhn dn trong khu vc ra.

- Cc cng trnh nh dn dc theo tuyn knh ch yu l nh tm, nh cp 4 v c xy trn nn t yu.- Bin php thi cng ch c th tip cn c t ng Miu Hai X v mt ng ph vi ti trng nh c th qua im D (cui h D Hng), cn ng vo t Nguyn Vn Linh do c rt nhiu h thng nh cp nc, in thoi, in lc. nn cha th tip cn ngay c

IV/ Cc cng vic thc hin trn on C-D

Thot nc:

Cc:

+ Cc th nghim : 10 cc, mi cc di 26 m

+ Cc i tr : 1008 cc, mi cc di 26 m.

Cng hp:

Cng hp di 479.20 vi kch thc 2x1,5x2m

Cng trn:

S dng cng D500 v h ga trn c sn D1000 gom nc nh dn dc hai bn va h trn c on C-D.ng giao thng

Chiu di ng giao thng l 443.12m. + Ti trng tnh ton vi xe H10

+ Mduyn yu cu Ey/c =1500 daN/cm2

+ p lc tnh ton ln mt ng 6 daN/cm2

+ ng knh vt bnh xe 33cm

+ Dc 2 mi dc ngang i = 2,0 %, dc ngang h i =1,5% v pha lng ng

Mt ct ngang : B = 7,5 + (2 x 3,0)m = 13,5 m , p mi taluy mp ngoi h, vi dc mi taluy i = 1 : 1,5

- dc dc imax = 0,75 %

- dc dc imin = 0,21%

Kt cu ng t trn xung nh sau (KC1):

5cm BTAF ht mn.

Ti nha 0,5kg/m2.

6cm BTAF ht th.

Ti nha 1,0kg/m2.

15cm cp phi dm loi 1

24cm cp phi dm loi 2

30cm t cp phi m cht K=0,98 Nn t m cht K= 0,95. H thng in chiu sng, cy xanh v m bo giao thng c b tr ng bphn 2: t chc thi cng tng th

I/ Nhn lc v thit b

V nhn lc:

- Nh thu s b tr y cn b c nng lc kinh nghim, sc kho m bo tt chc v thi cng t khu ch o, qun l gim st n th nghim ti hin trng.

- Cng nhn b tr c tay ngh cao, c thc t chc k lut tt, cng trnh t cht lng v m thut v tin thi cng ra.

- Cng nhn vn hnh xe my thit b, nh thu b tr cng nhn lnh ngh c tuyn chn, c kinh nghim thi cng nhiu cng trnh tng t a phng.

V thit b:

- B tr thit b, my mc thi cng v chng loi, hp l l vn quan trng. Cht lng thit b tt, nng sut cao p ng c tin , cht lng cng trnh.

- Tt c cc thit b, my mc cn thit cho dy chuyn thi cng u phi tun theo cc qui nh, nm trong chng trnh iu hnh cht lng di s gim st v chp thun ca k s.

- Cc xe my thi cng ch yu:

Nh thu s a vo tham gia thi cng cng trnh cc lai thit b, xe my thi cng ng chng loi, ph hp v cng sut (C bn k thit b, xe my tham gia thi cng cng trnh km theo). Lun lun m bo h s sn sng lm vic cao. Cc thit b o, m kim tra trn cng trng u l cc loi cn mi s dng, qua kim nghim k thut.

My m bn

02 m cc

03 My lu, m 8-25 (Tn)

02 My lu 1,5 tn

01- My i (110hp)

01 My o thu lc (v=1,25 m3) 02 t vn chuyn (5-7 Tn) 07

My bm nc (250m3/h)

02 Thit b hn + my pht in

03

My p cc thu lc 90T

02

My m di

06

My un/ct thp

02

Cn cu di dng 16T, 20T

02

* Ch : Loi my v s lng y l ch l tm tnh, thc t Nh thu cam kt s huy ng nhiu hn, cho cng trnh m bo tin thi cng, m bo cht lng.

II/ ln tri, Kho tng, nh xng

Ti v tr cc t C67 n cc C68 bn pha ng Nguyn Vn Linh, do c mt bng rng nn Nh thu s b tr vn phng Ban ch huy cng trng, nh cho cng nhn, kho v bi cha vt t v vt liu ti y vi din tch khong 200m2.

III/ in, nc trong thi cng

in thi cng:

m bo lun c in phc v thi cng chng ti d kin hai phng n:

Phng n 1: S dng c ngun in li cu a phng.- Trn on 1 ny nh thu s s dng in ca in lc L Chn c ti trm Qun Si phng D Hng Knh.- Nh thu t lp t, vn hnh, bo dng v di chuyn cc ngun cp in cho lm lnh, chiu sng v thng gi tm thi cho cc lu tri, vn phng kho cha, phng th nghim v tt c cc ln tri tm thi. Dng c o m, ng dy ni t ngun in n v tr thi cng do Nh thu t lo.Phng n 2: S dng ngun my pht khi in li cu a phng khng cung cp c cho qu trnh thi cng.- Trng hp cn thit chng ti s s dng mt my pht in 300KVA chy du izen cung cp in cho mi hot ng ca cng trng khi gp s c in.

Nc thi cng:

- Nh thu s t sp xp vic cung cp nc cho cc lu tri, vn phng v cc ngi nh tm cng nh cho vic thc hin cc cng vic khc. Vic u nc tm thi s c sp xp vi Cng ty cp nc thnh ph Hi phng vi gi nc c p dng. ng thi chng ti s ch ng ngun nc l cc ging khoan.

- Khi s dng cc ngun nc phc v thi cng nh ra dm, trn b tng ... Nh thu s bn bc v lin h vi cc i tc gn cng trng ang s dng nc xin php c s dng. Vi ngun nc s dng cho thi cng Nh thu s trnh phiu kim nghim cho ngun nc.Yu cu ca in, nc phc v cho thi cng ca nh thu cng trng phi m bo:

- nhu cu

- Lin tc trong sut thi gian xy dng

- Phi tht an ton cho cc thit b my mc, con ngi.

IV/ D tr, b tr vt t c s dng Ngun vt t d kin s dng:

- Tt c cc vt t a vo cng trng u c kim tra cht lng v nh k ly mu vt liu gi n cc c quan kim nh cht lng c t cch php nhn (c Ch u t v K s t vn chp thun) gim nh cht lng. Cc kt qu th nghim u c lu vo h s thi cng .STTTn vt liuNgun cung cp

1t iMua ti m Ba ph (Thu Nguyn-Hi phng). Vn chuyn t ni n cng trnh bng x lan v t t .

2Cp phi dm loi 1 v loi 2Mua ti m Minh c (Thu nguyn-HP). Sau khi mua, vt liu c chuyn n bi tp kt vt liu.

3Ct en p nnCt en sng Hng v sng Thi bnh. Mua ti cng

4Ct vngVnh Ph - mua ti cng

5 dmKinh Mn Hi Dng, mua ti cng

6 hcMua ti m Ba ph-Hi phng v vn chuyn n bi tp kt vt liu bng x lan v t t .

7St thp cc loiS dng thp Vinkansai, Vit

8Xi mngXi mng bn Sunpht ( Di +2.5m)

Dng xi mng Hi Phng, Chinhfon, PhucSon (Cho phn cn li)

9Nha ngMua ti Hi phng Petrolimex.

10ng cng, h ga cc loi, b va cc loi, an rnhCng ty TNHH Thin Ho - Qun Kin An - TP Hi Phng v c c ti bi c ca Nh thu

11Ton b cc KM, bin bo cc loiMua ti cng ty ng b 230 (Km 10-Quc l 5), sau c vn chuyn bng t n cng trng.

- Vt t thit b thi cng c tp kt ng khi lng v tin , v tr tp kt c thit k trc khi thi cng nn chng ti c th hon ton ch ng c ngun vt t v thit b theo tin thi cng. Ngoi ra chng ti b tr cc ngun vt t thit b d phng c th cung ng kp thi trong cc trng hp bt trc c th xy ra.

- Tt c cc vt liu ny lun m bo ng yu cu trong c tnh k thut v ly mu trc khi a vo s dng.

- Do c im ca d n, cc hng mc di ct +2.5m phi dng ximng bn sunpht. Nh thu ang ngh t vn ph duyt cho s dng c ph gia bn sunpht kt hp vi ximng Trung ng v Xi mng bn sunpht ca nh my Ximng X18 B Quc Phng.V/ Hng v tuyn thi cng

- Do tin t chc thi cng yu cu khn trng vi cht lng k thut cao. Hn na vic tin hnh thi cng c th gp ma nn vic b tr thi cng phi tin hnh hp l, cc hng mc phi c phi hp ng b v cht ch vi nhau (cp thot nc, nn ng, mt ng..) huy ng my mc thit b cao, an ton lin tc ng b cho ngi, my mc thi cng cng nh m bo giao thng v v sinh mi trng trong sut qu trnh thi cng.

- Cn c khi lng cc hng mc cng trnh, n v t chc thi cng theo phng php dy chuyn, tun t, song song, thi cng bng c gii l ch yu kt hp th cng.

- B tr ring mt nhm lm cng tc phn lung, m bo giao thng cho tt c cc dy chuyn thi cng trn t khi bt u trin khai n khi hon thnh cng trnh.

- V tr ng qun, nh xng, kho tng, bn bi hp l, ng thi thun li cho qu trnh thi cng v tp kt vt liu v iu phi trn tuyn.

- Thi cng p cc v cng hp theo hai mi:+ Mi 1 : T im D v cc C73 (ng Nguyn Vn Linh).

+ Mi 2 : T im C (cui H D Hng) n cc C73.

VI/ Cc yu cu k thut khi thi cng v nghim thu cng trnh

Trong qu trnh thi cng, nghim thu Nh thu lun tun theo cc cc yu cu k thut c nu trong quyn Tp 2 Yu cu k thut v cc tiu chun c nu trong ph lc A v B trong quyn Tp 2 Yu cu k thutphn 3 : bin php thi cng chi tit

no vt lng mng, lm ng tm v mt bng thi cng.Nhn cc mc ta chun t ch u t. Kim tra li chun ca ct nn so vi ct thit k thng bo vi ch u t nhm a ra bin php x l kp thi.Xc nh phm vi, tim tuyn xy dng ca hng mc thi cng, cao hin trng bng my trc c. Mi t vn gim st v Ban qun l xc nhn.

T mc chun dng my ton c in t v mia cng li trc c cho cng trnh. Xy dng cc mc chun dc theo tim tuyn cng trnh. Tt c cc mc c dn ra ngoi phm vi nh hng ca xe my thi cng, c nh v c bo v chu o c th nhanh chng khi phc li cc cc mc chnh ng v tr thit k khi cn thit.Xc nh khi lng cng vic v phng tin thi cng, nhn lc ph hp thi cng.

Nh thu s s dng my xc bnh xch dung tch gu 0,65m3 xc lp ph thi xy dng (phn t o b sung) v lp bn ln t chuyn ra ngoi cng trng n bi ng quy nh. Khi my xc, xc bn n ct o vt bn th dng li, cho my xc li li v cho t t vn chuyn ct en san nn vo v tr o, dng my i san ct ln dn t gn ra xa. Mi khi t chiu dy 30cm cho my m vo kt hp ti nc m cht, lm nh th cho n khi cao ct nn mt bng thi cng p cc khong +3.3m ( +3.4m. Mt bng thi cng p cc phi lm cao +3.3m ( +3.4m bi cc l do:+ Cao ti a ca mc nc ngm;

+ Thot nc cho mt bng cng trng ngay c trong ma ma;

+ nh hng ca thu triu;

+ nh hng nc thi 2 bn trn vo;

+ Trong cng tc p cc, Nh thu phi s dng cc thit b p, cu v xe vn chuyn cc c tr trng ln di chuyn trn mt bng. Nu ct mt bng thp hn ct mc nc ngm th Nh thu s khng th thi cng c v mt khc s gy ra ngp ng lm nhim mi trng.

V thot nc khi thi cng, trn ton on, Nh thu b tr mt rnh dc chnh v mt rnh dc ph nm ngoi phm vi thi cng cng hp (gn nh dn), khong 50 n 100 m li b tr mt rnh ngang thot nc t rnh dc ph sang rnh dc chnh. Ti im C (cui h D Hng) v ti im D ( ng Nguyn Vn Linh), Nh thu p mt b ngn nc v o mt h ga thu nc t rnh dc chnh bm nc t h ga vo h thng thot nc chung v ra on knh h D-F khi thi cng v mt bng c kh ro.Trn on ny, Nh thu d kin s dng 2 my xc PC200, 6 t t 5m3, mt my i , 3 my bm 250m3/h, 02 my bm 40m3/h, 3 my m cc.

Ph thi xy dng, bn, t o c Nh thu k hp ng vi Cng ty mi trng th thnh ph Hi Phng ra bi s l ca h ti nh V.Cc xe ch, vn chuyn cht thi hu c phi c thng kn m bo khi vn chuyn khng ri ra ng.

Trong qu trnh thi cng ti cng trng cng nh vn chuyn ph thi, khng trnh khi nhng vng mc v k thut, bin php p dng, mt bng thi cng phi x l. Nh thu mong mun c gip , hp tc cht ch ca T vn gim st, Ban qun l d n, v cc ban ngnh lin quan nh S ti nguyn mi trng, Thanh tra giao thng, Cnh st giao thng v chnh quyn a phng s ti.

X l nn mng cng hpTrnh t:

Nh nu phn ng tm, mt bng p cc s c thc hin cao +3,2m ( +3.3m.

Vic gia c nn t do c thc hin sau khi c kt qu p cc th nghim, kho st li a hnh v kho st a cht b xung, 3 cng tc ny c tin hnh song song v c lp tin hnh lm bo co tnh ton li thit k trnh t vn ph duyt trc khi p cc i tr.

Cng tc kho st li a cht v a hnh do trung tm a k thut, trng i Hc m a cht H Ni l n vi c lp c nng lc tin hnh v lp bo co trnh t vn v ch u t. Xc nh phm vi gia c nn bng cc BTCT, a cc BTCT v my p cc vo p cc th nghim. Tin hnh lm cc th nghim xc nh sc chu ti ca cc cho tng on. S lng cc th nghim phi tun theo tiu chun ca Vit Nam l 1% (TCVN 269-2002). Cng vic ny phi c tin hnh sm v c nh vy mi c th thi cng c vic p cc i tr. V tr cc cc th nghim do nh thu xut v phi c t vn gim st cng ch u t ng .

Sau khi c kt qu chnh xc v sc chu ti ca cc cho tng on nn gia c, nh thu trnh T vn gim st v Ch u t xem xt thit k cc v quyt nh trc khi p cc i tr.

Vn chuyn v cu cc t bi c cc n v tr p cc bng xe Huyndai ti trng 15T

p cc bng my p tiu chun, my c kim nh bi c quan chc nng v c chng ch kim nh.

Trong qu trnh p cc, nhng v tr gn nh dn Nh thu u xy dng bin php m bo an ton trnh T vn quyt nh.

c sn cu kin cc BTCT :

Cc c thi cng theo thit k c kch thc 25x25 cm, di 26m c chia thnh 4 on mi on di 6,5 m b tng mc 300, ti bi c cu kin c sn ca Nh thu ti Cng ty Cng ty C phn Cng ngh 204 x An Hng- huyn An Dng TP Hi Phng.

Khi c cc Nh thu s dng b tng thng phm.Vt liu s dng c cc:

Xi mng:

Xi mng c dng cho c cc l xi mng bn sunpht, Nh thu s s dng xi mng bn Sunfat ca nh my Ximng X18 - B Quc Phng, loi xi mng ny cng ang c d n 1B s dng v Xi mng thng kt hp vi ph gia bn Sunfat.Ct:

Ct c s dng l ct vng Vnh Ph. Chng ch ca loi ct ny Nh thu trnh cho TVGS. Ct dng phi sch, ht nc khng vt qu 3%

:

b tng l khng b phong ho, bn v chc ca chc, khng b h hng khi b tc ng trc tip cc cc iu kin thi tit, nc v sng, tng mnh phi khng b nt, gy v c mt tinh th yu. Nh thu s dng Kinh Mn - Hi Dng, chng ch Nh thu cng trnh TVGS. Kch c ca l 1x2.Nc:Nc ra ct liu cho trn v bo dng b tng phi sch v khng c cht bn v phi tho mn nhng kin ngh nu trong Tiu chun Vit Nam; nng sunpht v clorua trong va b tng trn phi tun theo cc gii hn nh v hm lng mui.

Ct thp:

Ct thp s dng l thp Vinakansai, Vit Cc kch thc, loi thp c c lm theo ng bn v thit k.I/ Vn khun cc.- Vn khun dng c cc nh thu c sn, loi vn khun thp c ch to bng thp tm hn li vi nhau.

- Lp dng cc tm vn khun li theo hnh dng v kch thc cc bng th cng.

- Cc tm coppha lin kt li bng bu lng. Dc theo chiu di ca vn khun b tr h thng vng chng v gng gi vn khun m bo vng chc cho vn khun.

II/ Gia cng v lp dng ct thp, b tng cc.

- Ct thp cc c gia cng, lp buc ng kch thc, chng loi v bn v c duyt.

- Sau khi ct thp c gia cng v lp buc xong, nh v ct thp trong vn khun bng cc con k c c bng b tng M300 bng vi mc btng cc, c tc dng m bo c chiu dy lp b tng bo v ct thp.

- Vnh thp ni phi phng khng c vnh, vnh vnh thp ni phi nh hn 1%.

- Ct thp dc ca cc phi hn vo bn m theo c hai mt v trn sut chiu di bn m.

- Khi nh v xong, mi t vn gim st tin hnh nghim thu ct thp b tng.

b tng:

- Va b tng c trt t my trn xung xe ci tin chuyn dng v vn chuyn n ni b tng.

- b tng vo vn khun. b tng n u m n , v m lin tc cho n khi hon chnh.

- Mu c ly ra t mt m trn, m trn ny c ly bt k c tnh ngu nhin v mu th c c lm ba mu. Mu th b tng c lu v bo dng ti cng trng cng vi iu kin bo dng ca cu kin b tng. Trong qu trnh b tng nh thu s tin hnh ly mu thng xuyn th nghim theo qui nh trong h s mi thu, c 25m3 b tng ly mt t mu. Mi t mu gm ba vin mu vi kch thc tiu chun mi vin l: 150x150x150 v trn mu phi ghi r ngy, thng, nm, cng trnh, st (Trong : mt vin th nghim tui 7 ngy v hai vin th nghim tui 28 ngy). S lng t mu qui nh ly theo khi lng nh sau:

i vi cu kin chc nng c lp c khi lng nh hn 25m3, ly khng t hn mt t mu cho mt cu kin.

Nh thu s m bo cng b tng thc t tui 28 ngy theo ng qui phm Nh nc qui nh v phi trnh kt qu th nghim cho t vn gim st v Ch u t bit.

m b tng:

- Dng m di loi t 3.5cm n 7cm m b tng. Qu trnh m b tng phi m bo m theo phng thng ng, khng m va chm vo ct thp v vn khun lm x dch ct thp.

- b tng xong tin hnh lm b mt b tng.

- Sau khi nghim thu t yu cu xut xng cu kin c v vn chuyn cu kin c ra cng trng.

Bo dng b tng

Sau khi b tng xong c khong 3h Nh thu s tin hnh bo dng b tng. lun m bo m trn 75% trong mt tun sau khi b tng, Nh thu s dng bao ti ay ph kn ln b mt cc v ti nc sch thng xuyn ln .Vn chuyn cu kin BTCT:

- Cc BTCT sau khi cng thit k c vn chuyn ra cng trnh thi cng lp t bng t.

III/ Trnh t v bin php th cc.

Tp kt cc th:

- Tt c cc cc trc khi p th Nh thu s xut trnh T vn gim st, Ch u t bin bn kim nh cht lng ct thp v b tng cc, chng ch xut xng cc.

- Khi th cc, n v thi cng s trnh Ch u t, T vn gim st cc thng s k thut ca my p cc, chng ch kim nh my p v cc my phc v qu trnh p.

- Ch nhng cc thi gian bo dng b tng l 28 ngy tui th mi bc xp cc ln t vn chuyn cc ra cng trng n nhng v tr d nh p cc th. Khi xp cc c k chc chn trn hai con k bng g t ti v tr im cu nh du sn trn cc.

Th cc bng phng php p cc:

Theo quy phm Vit Nam:

TCVN 190-1996: Mng cc tit din nh-Tiu chun thi cng v nghim thu

TCVN 269-2002: Cc- Phng php th nghim bng ti trng tnh p dc trc.

a. Yu cu trong qu trnh p th cc:

- B tr my thu bnh o ln cc trong qu trnh p. Trn cc mt ca on u cc phi c k tim cc c chia thang vch n cm bng sn (ng tim cc v thang phn on vch hng v pha t my c ln). Phn cn li ca cc c chia thang vch 0,5m theo di qu trnh p.

- Trc khi p on cc cui, dn giy k ly kim tra chiu chi ca cc.

- Mi cc th c nht k theo di qu trnh ng theo ph lc quy nh.

- Tt c cc s liu trn c ghi chp y v thnh lp h s cung cp cho C quan thit k lm c s tnh ton li v quyt nh chiu di cc p i tr.

- Trc khi tin hnh n v thi cng s bo co bng vn bn cho Ch u t, T vn gim st, C quan thit k, C quan thc hin kim tra bit k hoch v thi gian thc hin trc 3 ngy cng nhau phi hp thc hin.

b. Qu trnh thi cng p cc th Nh thu lun lu :

- To th cc phi chnh xc, khng sai s qu tr s cho php.

- Vic ni cc, vn chuyn, p cc thc hin nh thi cng cc i tr.

- H thng cc chun, dm chun... phi c bo v, chng mi va chm ngu nhin trong qu trnh lm vic. Cc thit b o c bo v tt, chng mi tc ng trc tip ca thi tit: nng, ma, gi...

- Trong qu trnh thi cng th cc Nh thu s phi hp cht ch vi Ch u t, c quan thit k cng thc hin.

c. B tr my p th cc:

My p cc 90T : 01

My cu cht ti: 01 cu K162 16TMy hn 4KW : 02 t ti vn chuyn cc Huyndai 15T t hnh: 01

T cng nhn: 10 ngi

IV/ Bin php p cc.

Nhn lc, Xe my, thit b p cc:Ti hin trng p cc s c:

My p cc 90T: 02My cu cht ti: 02 cu K162 16T

My hn: 04 t ti vn chuyn cc Huyndai 15T t hnh: 02

My pht in: 01 ci (d phng)

T cng nhn: 20 ngi

Trnh t v bin php p cc i tr (phng php p trc):Cng tc p cc thc hin theo cc bc sau:

Bc 1: Cng tc nh v cc

- Cn c ta ca tng cc thit k, dng phng php tam gic lng, tnh ton gc m v chiu di cc cnh tam gic. chuyn t v tr thit k ra thc a, dng hai my kinh v t trn hai mc to thit k o c xc nh to tng cc theo phng X, Y ca trc to .

- Lp bn v ghi r khong cch v s phn b cc cc vi im giao nhau gia cc trc. cho vic nh v thun li v chnh xc, cn phi ly 2 im lm mc nm ngoi kim tra khi cc trc b mt (nu xy ra) trong qu trnh thi cng.

- Trn thc a, v tr cc c nh du bng cc thanh thp (10 hoc cc tre di t 20 n 30cm..

Trong qu trnh thi cng v lu gi h s nh th s gi cc ghi chp p cc nh nh biu mu c 3 bn thng nht.Bc 2: Tp kt cc.

- Cc BTCT c c sn ti bi c v vn chuyn bng xe ti xung gn v tr p cc, v c nm trong tm vi ca cu.Bc 3: p cc bng kch thu lc c i trng trn

Qu trnh thi cng cc c tin hnh theo trnh t sau:

+ S dng cc dn p m cc so vi t ang thi cng n cao u cc thit k.+. Theo di trnh t xung ca cc.

+. Hon thin u cc.

a. Tin hnh p cc:

- Kim tra s cn bng n nh ca thit b p cc:

+ Mt phng cng tc ca sn my p phi song song hoc tip xc vi mt bng thi cng.

+ Phng nn ca thit b p phi vung gc vi mt phng cng tc. nghing khng qu 0,5%.

+ Chy th my kim tra tnh n nh v an ton my chy (chy my khng ti v c ti).

- Kim tra cc v cu lp cc vo v tr trc khi p.

+ Buc cp cu cc vo cc im cu nh du trn cc. Ko dy mc cu a ln cao ti thiu so vi mt sn 1,5m, quay u cu a cc xp vo khung gi my.

+ Lp cc ai m cc c nh cc vo gi.

- Tin hnh lp on cc u tin (on 1):

+ Khi tin hnh vn chuyn v lp rp thit b vo v tr p phi m bo an ton. Chnh my cho cc ng trc ca khung my, trc ca kch, trc ca cc thng ng, trng nhau v cng nm trn mt mt phng; mt phng ny phi vung gc vi mt phng chun nm ngang

+ on cc ny cn c dng lp cn thn, cn chnh trc ca n trng vi phng nn cu thit b p v i qua im nh v cc. + Khi y kch tip xc cht vi nh cc th iu khin van tng dn p lc. Cn ch nhng giy u tin, p lc nn tng t t on cc xuyn su dn vo t mt cch nh nhng vi vn tc khng ln hn 1cm/sec.

+ Khi pht hin thy nghing phi dng li, cn chnh ngay.

- Lp ni v p cc on cc tip theo ( on 2 ):

+ Kim tra b mt 2 u ca on 2, sa cha cho tht phng, lp dt, cn chnh ng trc ca 2 trng vi trc kch v trc ca 1.

+ Kim tra chi tit mi ni on cc v chun b my hn.

+ Gia ln u cc mt lc khong 3-4 (kg/cm2) to tip xc gia hai b mt b tng v duy tr p lc ny trong sut thi gian hn ni, ri mi tin hnh hn ni theo qui nh ca thit k. Kim tra cht lng mi hn theo tiu chun.

+ Tng dn p lc nn my p c thi gian cn thit to lc p thng lc ma st v lc khng ca t mi cc cc chuyn ng. Thi im u 2 i su vo lng t vi vn tc xuyn khng qu 1cm/sec. Khi on 2 chuyn ng u th mi p cc vi vn tc xuyn khng qu 2cm/sec. Tip tc nh th lp cc on 2 tip theo.

- Cc c coi l p xong khi tho mn hai iu kin sau:

+ Chiu di cc p di bng chiu su do thit k qui nh.

+ Lc p ti thi im cui cng phi t tr s thit k qui nh trn sut chiu su xuyn ln hn 3 ln ng knh hoc cnh cc. Trong khong vn tc xuyn khng qu 1cm/sec.

b. Theo di trnh t xung ca cc:

- Sau khi cc cm su vo t 30 - 50cm, ghi ch s lc p u tin. Mi ln cc i xung 1m li ghi lc p ti thi im vo nht k thi cng, k c khi lc p thay i t ngt.

- Ghi lc p giai on hon thnh vic p mt cc: khi lc p c gi tr bng 80% gi tr lc p gii hn ti thiu th ghi li ngay su v lc p . Bt u t su ny, ghi chp lc p ng vi tng xuyn su 20cm vo nht k cho n khi kt thc.

c. Hon thin u cc:

- Do p cc m nn phi chun b mt on cc dn di c th c p on cc cui cng ng yu cu ca thit k.

V/ Bin php p cc di ng in cao th.- T cc C68 ( C71 di 80,00m ca on C-D nm di vng nh hng ca ng in cao th 110KV do Cng ty in lc Hi Phng qun l (Ngun in ny c cung cp cho khu vc qun L Chn, Ng Quyn, Khu cng nghip Vnh Nim).

- Chiu cao tnh t mt t ln v tr thp nht ca dy in l 14m v khong cch ngang ca dy 2 dy in l 8m(xem bn v mt bng).

- nh hng ca ng in ti phm vi thi cng l 80m, li cc trong on ny c 152 cc.

Gii php thi cng p cc di ng in cao th.

Khong cch an ton thi cng l phi m bo cch ng in l 4m cho nn khong cch cn li ch l 10m. Nh thu s c gng h ct thi cng xung 0,5m, khi nng chiu cao c php thi cng ln 10,5m.

Vi chiu cao 10,5m, Nh thu s phi hn ch phm vi hot ng mi thit b thi cng khng vi phm chiu cao ny.

i vi Cu t hnh: Mc d dng loi cu ADK ca Nht, vi sc nng l 16T, tm vi l 18m nhng chng ti s hn c nh li cu, ch cho php Cu hot ng c nh trong tm 10,5m.

i vi my p cc: L my p thu lc song hnh, chiu cao dn p l 9m, Lc p ti a l 120T, vic a cc vo lng cc c d dng, chng ti s ct bt chiu cao dn cn 8m.

i vi cng nhn: Phi tuyt i tun th cc yu cu v an ton lao ng v c bit l an ton lao ng khi lm vic di ng in cao th.Gii php thi cng:

Ton b thi gian thi cng p cc di li in s c gim st cht ch ca T vn gim st thi cng, cc cn b k thut ca in lc Hi Phng v cn b k thut thi cng ca Nh thu.

a, Cng tc d, xp i trng:

Cng tc xp i trng c tin hnh sau khi chuyn sang v tr p cc mi, i trng s c cu xp ln dm ca dn p cn bng t 2 pha, trnh hin tng nghing dn p dn ti p cc b nghing.

Khi p xong, i trng phi c d chuyn dn p sang im p tip theo, qu trnh d i trng cng phi tin hnh d cn bng t 2 pha trnh dn, gy nguy him. i trng sau khi d, phi c v tr thun li sao cho khi xp cho im p tip theo phi trong phm vi tm vi b khng ch ca cu.

b, Cng tc di chuyn dn p:

Sau khi d i trng, dn p c di chuyn sang im tip theo. Vic di chuyn phi c tin hnh mt cch cn thn, cp cu phi c buc v tr gn nh dn p. Khi nng dn, khng c nng qu 2,5m so vi mt t (m bo chiu cao ca nh dn khng qu 10,5m).

Dn p c Cu di chuyn ngang kt hp vi cng nhn iu chnh vo v tr mi.

c, Cng tc a cc vo lng ca dn p:

Phng php a cc vo lng p l phng php a ngang, khi cu cc phi ch nh ca cc khng c cao qu chiu cao ca Cu.

Thi cng cng hp

I/ Cng tc thi cng gia c thnh h o mng cng hp:

Thnh h o c gia cng bng cc c Larsen II di 6m kt hp vi h vng chng ngang bng thp hnh H250.

Cng tc chun b:

- Cc c Larsen, h vng chng ngang c tnh ton chng loi, s lng, chiu di.Thi cng p cc c Larsen:

- Dng my kinh v xc nh phm vi thi cng h mng, vi kch thc ngang ca h mng l 9,0 m, chiu di mt phn on l 15,4m. m bo thi cng c lin tc, cng tc ng cc Larsen trn mi mi thi cng s c ng mt ln cho 2 phn on (Nh thu s thi cng theo hai mi, mi 1: T cc im D v cc C73, mi 2: T im C n cc C73).

- Dng vi bt nh du ng ng cc Larsen.

- Dng my p cc Larsen xung mt cch t t, cc cc Larsen c lin kt st vi nhau, trong qa trnh p cc Larsen phi cng dy c sao cho hng cc c thng. Cao u cc Larsen c p n cao bng mt bng p cc +3.3 m.

- Sau khi thi cng p xong cc Larsen mi cho my xc o t h mng, khi o n cao +3.0m th tin hnh cng tc lp t thanh h vng chng ri mi thi cng o t n cao thit k, cng tc o t n u phi xong n y. My bm nc phi c duy tr lin tc m bo h mng lun kh trong qu trnh thi cng.

- Cng tc rt cc c thp c thc hin ngay sau khi thi cng xong cng tc lp ct en h mng.

Chi tit c th hin trong bn v km theo(Bn v c th cho mt mi thi cng).

II/ Cng tc o t v ph u cc BTCT.

- My s o n ct cch u cc p trc n khong 20cm trnh nh hng n cc p. Sau khi hon tt cng tc o t ng thi cng tm phn on ny Nh thu s cho nhn cng xung o th cng n ct b tng lt mng cng thot nc hp, v ph u cc BTCT. Cng tc ny, mc d l cng vic gin n nhng s gy nh hng n cht lng im tip xc gia cc v phn mng ca cng hp thot nc. V vy vic ph u cc BTCT phi c thc hin ng k thut v khng c nh hng n cht lng ca cc p.

- Dng my thu bnh xc inh v tr ct u cc, dng sn vch xung quanh cc.

- Dng my ct b tng cm tay ct b tng cc theo ng sn vch ( Chiu su ct nh 3cm m bo khng nh hng n ct thp dc ca cc).

- Dng ba hi kt hp vi th cng (ba tay, c, trm) ph u cc .

Iii/ thi cng cng hp.

III.1/ B tng lt mng cng hp:

Chun b - Trm trn b tng 60m3/h, my m bn, nhn cng thi cng, xe ci tin, x thng ...

- Cc loi vt liu: , Ct, Xi mng c chn ng chng loi theo thit k, tiu chun yu cu.

- Nc sch dng thi cng

- My bm tiu thot nc mt h mng lun kh ro trong qu trnh b tng v b tng ninh kt.

Tin hnh thi cng b tng lt

- Cng tc b tng lt mng ch tin hnh sau khi nghim thu phn Ph u cc BTCT, kh nng thot nc ca tng phn on nh thi cng, km theo bin bn nghim thu ca cc cng tc nu trn c ch k ca cc bn lin quan.

- Sau nh thu s tin hnh gic cc trc bng my kinh v, ng cc cc cao ri b tng lt y mng, hon thin kch thc v chiu cao ng thit k yu cu.

- Cng tc o t, p u cc xong th cho tin hnh B tng lt mng mc 100 chiu dy 100mm. B tng c trn bng trm trn, c vn chuyn n cng trng bng xe Mix v xung h mng bng mng .- Dng m bn m b tng lt mng

- B mt ca b tng lt mng sau khi m xong phi bng phng ri ct thp sau ny.

- Sau khi lm xong btng lt mng ngng ch theo yu cu cng ngh ri tin hnh lp dng ct thp, cp pha v btng mng theo ng thit k.

III.2/ H thng thot nc cng hp 2x 2x1,5 (m):

Sau khi thi cng b tng lt cng 1 ngy tin hnh vo thi cng cng hp. Theo thit k cc phn on cng hp c chia vi chiu di l 16,1m kt hp lm khe bin dng. Ti ch mch dng c xm ay nha bitum nng chng thm. Trn mi phn on li chia lm 3 t thi cng:

- Mng cng (y cng)

- Thnh cng

- Mt trn cng

* Cc dy chuyn thi cng cng hp:

- Ct thp mng cng hp

- Vn khun mng cng hp

- b tng mng cng hp

- Ct thp thnh cng hp

- Vn khun thnh cng hp

- B tng thnh cng hp

- Vn khun mt cng hp

- Ct thp mt cng hp

- B tng mt cng hp

- H ga thm BTCT cng hp.

a, Cng tc gia cng v lp dng ct thp:

- Ct thp mng c gia cng theo TCVN 5574-91.

Theo thit k s dng 2 loi ct thp :

AI : Ra = 2.100 kg/cm2.

AII : Ra = 2.700 kg/cm2.

- Thp vn chuyn n cng trng phi c y ho n, chng ch xut xng, thp m bo khng b han g, khng b gp cy thp .

- Thp trc khi dng c ko th xc nh cng thc t. Thp phi yu cu k thut, c cn b gim st ng mi a vo s dng.

- Ct thp c lin kt vi nhau bng thp mm 1 ly (hoc lin kt hn).

- Ct thp c lm v sinh sch s trc khi dng, khng g, khng dnh du, t. Ct thp b gim din tch mt ct do co g, b bp khng qu gii hn 2% ng knh.

- Khi vn chuyn ct thp trong cng trng c cn b hng dn c th cho cng nhn cc v tr mc cu, cch neo buc, cch bo v thp khi b bin dng, h hi.

- Thp c bo qun trong kho trnh ma, nng, c cch mt t ln hn 45cm. Thp c xp thnh l theo k hiu ng knh sao cho d nhn bit bng mt thng, d s dng.

- Vic gia cng c tin hnh ti xng.

- Ct thp c nn thng, ct un bng my, tun theo TCVN 8874-91.

- Ct thp gia cng xong c xp thnh tng l. Mi l ly 5% sn phm kim tra. Tr s sai lch khng c qu quy phm TCVN 4453-95.

- C nh ct thp: Ct thp c t trong vn khun theo ng v tr thit k. Ti cc v tr giao nhau, buc bng dy thp mm 0,8 - 1mm, ui buc xon vo trong ai.

- Ni thp : c thi cng theo ng ch dn thit k, k c v tr ni v chiu di ni.

- Hn thp : vic hn thp c tin hnh ng theo TCVN 5724-93.

- Trc khi t ct thp vo v tr, k s kim tra li vn khun cho ph hp vi thit k, gia ct thp v vn khun t cc ming m bng b tng c chiu dy bng lp b tng bo v ct thp nh thit k, khng k m bng g, gch .

- K s hng dn cng nhn lp t ct thp c th t hp l cc b phn lp trc khng nh hng ti b phn lp sau.

- Hnh dng ca ct thp lp dng theo thit k c gi vng trong sut thi gian b tng, khng bin dng, x dch.

b, Cng tc vn khun

y l mt trong nhng cng tc quan trng trong cng tc b tng ct thp, cng tc ny quyt nh mt phn n tnh m thut, tnh chnh xc ca cng trnh do vy nh thu s rt ch trng khi chn kiu, loi vn khun a vo gia cng lp dng. Trong cng trnh ny, nh thu s dng cc loi cp pha sau:

Cp pha mng, thnh, mt cng dng vn khun thp nh hnh, nhng v tr c kch thc c bit s dng cp pha g dn dy 30mm.

Vn khun mng cng hp:

Copha mng c lp dng khi ct thp ca mng lp dng xong. Sau khi thi cng phn lt y mng t trc c tin hnh nh v li chnh xc tim trc ca cng, sau thc hin vic lp vn khun c nh 2 bn. Nh thu s s dng cp pha tn kt hp cp pha g.

Kim tra tim, ct, cao , v tr ca vn khun bng my kinh v, thu bnh so vi thit k t tiu chun thit k, k s gim st chp thun mi tin hnh cng tc b tng mng.

Tho copha sau 48 ting b tng vi iu kin bo dng b tng thng xuyn ng quy phm.

Cpha thnh cng hp:

Cpha thnh l copha thp nh hnh c lp ghp sau khi lp dng xong phn ct thp thnh cng. Thi cng thnh rt quan trng, n nh hng rt ln n tin thi cng phn copha, ct thp mt trn cho nn phi lm tt cng tc chun b. T trc c xc nh tim cho tng thnh theo c hai phng nh du bng sn . Coppha c chun b y t trc ch vic mang ra g lp. Copha thnh hnh ch nht dng cpha thp nh hnh lin kt bng cc ci kp cp pha. S dng h thng xuyn tm mi bn thnh cppha cng bng 2 thanh thp U50 theo chiu dc vi khong cch khong 0,65m v cc thanh U50 ng vi khong cch 2m ging gi cppha kt hp dng neo tng thp (8 ging cho xung y mng v ging ngang gia cc cppha thnh vi nhau. Tng ging cho c neo vo mng bng mc thp (8 chn sn khi b tng mng v cch chn thnh cng khong 1,2m.

Dng my kinh v, thu bnh kim tra chnh xc tim, ct, thng ng ca thnh, ghi s nht k thi cng trc khi b tng.

Cc tiu chun khc phi tun th theo quy trnh, quy phm ca Nh nc.

Bin php copha mt trn cng hp:- Dng h gio PAL kt hp vi x g g, thp ton b kt cu mt trn, cp pha thp nh hnh lm vn khun y mt trn cng hp. Tm y mt trn c t trn 2 lp x g g. Lp th nht l x g 80x100 a400, lp th 2 l x g 100x120 chy trn bt ca h gio PAL

- Gii php kt cu sao cho h thng cp pha khi mang ti khng b bin dng, ch ch tip gip u thnh v mt trn phi v sinh sch s trc khi b tng ti nc ra sch sau ti nc xi mng.

- Tt c cc l ch qua mt trn v cc chi tit t sn c nh du ln b mt cp pha mt trn mt cch r rng, chc chn khng b x dch trong qu trnh b tng.

- Chi tit vn khun mt trn cng nh trnh by trong bn v thi cng chi tit vn khun mt trn cng hp.

- Trc khi lp t h ct thp khung thnh, mt trn, ... phi nghim thu hon chnh h thng vn khun nh vn thnh, ct chng, gio, ... trnh tt c cc sai st, bin dng vn khun khi thi cng.

Lp dng coppha:

- Tt c cc phn cpha, gio lp dng chng ti u c mu trc c xc nh v tr, nh du r rng bng sn nhng ni c nh, d thy.

- Trc khi lp t cc phn cpha +gio phn trn chng ti kim tra vng chc ca kt cu phn di.

- Trong qu trnh thi cng cc k s ca nh thu kim tra cc yu t: chnh xc ca vn khun so vi thit k, bn vng ca nn, gio chng, bn thn vn khun, sn thao tc, cc v tr neo gi, kn kht ca vn khun, n nh ca ton b h thng, cc v tr l ch, cc chi tit t ngm...

Sau khi lp dng xong chng ti s dng my phun nc p lc cao v sinh ton b cpha + ct thp trc khi b tng.

Tho d coppha:

Cpha gio chu lc ca cc kt cu (y mt trn cng, ct chng) c tho d khi b tng t cng cn thit kt cu chu c trng lng bn thn v cc ti trng tc ng khc trong giai on thi cng.Bin php thi cng phn on cng hp ti bn xe but.Ti on C-D c mt trm xe but ti cc s C68+4,45 n cc C69+16,56, phn y ca cng hp trn on ny c chiu rng l 11,20m (Ti cc v tr khc bn y c chiu rng l 7,50m), phn thnh v mt cng hp tng t nh cc phn on khc.

- Tt c cc cng tc, tho lp vn khun, ct thp, b tng c tin hnh tng t nh cc phn on cng hp khc nh trnh by trn. Tuy nhin, phn on cng hp ny cc c Larsen phi c ng rng hn, h vng chng di hn do h mng phi c o rng l 12,70m (cc on khc l 9m).

- Do v tr thnh cng hp cch xa thnh h o hn cc phn on khc, ngoi cc thanh xuyn tm, tng vng chng vn khun thnh pha bn ngoi s c vng chng mau hn v to hn ( Bn v chi tit trong bn v thi cng).Cng tc b tng cc kt cu:

a,Cc vn chung v b tng cc kt cu

Sau khi nghim thu k lng v cp pha, ct thp vi T vn gim st, Ch u t, nu t yu cu nh thu mi c php tin hnh cng tc b tng.

Kim tra chnh xc v tr tim, ct, cc chi tit ch m bo sau khi b tng tin hnh lp dng vn khun v cp pha phn sau khng b sai lch.

B tng cho cng hp l b tng thng phm, c vn chuyn n cng trng bng xe MIX, btng c bng my bm hoc bng mng . m b tng bng m in (my m xng d phng khi ang thi cng b mt in).

B tng mt trn th hin trn bn v thi cng b tng. Do khi lng b tng tng i ln, yu cu cht lng b mt cao nh thu s s dng b tng c cng theo thit k ng vi quy phm. Chiu dy cc lp b tng thch hp vi kch thc kt cu v dng c m. Trong qu trnh b tr my thu bnh lin tc theo di kim tra cao ngoi ra b tr c ct t theo li vung 2m x 2m cho ngi th theo di d dng. Nn c chia lm cc phn on . Sau khi san, m b tng nn s s dng thit b lm nhn b mt theo ng yu cu thit k.

Cng nhn s b tng di s ch dn ca cn b hin trng m bo thc hin cng tc b tng theo ng trnh t, qui cch hp l, ng qui phm.

b, Trong qu trnh b tng phi tun th cc yu cu sau:

Khng lm sai lch v tr ct thp, cp pha, v tr cc chi tit ch v chiu dy lp b tng bo v.

Nu ct thp b cong, vnh th phi c nn thng li trc khi b tng.

Lm mt trn cng tc cn b, cng nhn i li trong qu trnh b tng khng dm, p trc tip ln ct thp lm h hi ct thp.

Mi kt cu u phi ch n cao trnh mt b tng (cc cao trnh ny phi c nh du bng cc mc c nh trc khi b tng), khng c cao qu hay thp qu so vi thit k, mt b tng phi c hon thin k lng.

c, Ct liu trn va b tng

Ct liu sn xut b tng phi m bo yu cu k thut theo cc tiu chun hin hnh. Ct liu phi c bo qun, trnh nhim bn hoc b ln ln c ht v chng loi.

Xi mng s dng xi mng Hi Phng PC40. Tho mn quy nh tiu chun ca xi mng Poc-lng TCVN 2682-1992. Xi mng c bo qun ti kho m bo ni kh ro thong mt. Xi mng khng b vn cc, i mu sc.Ph gia trn b tng cng hp l ph gia bn sun pht Plaacc CR.Ct dng lm b tng phi tho mn cc yu cu ca tiu chun TCVN 1770-1986: "Ct xy dng - yu cu k thut. Ct khng ln t v ln tp cht. Bi cha ct phi kh ro, ng theo nhm ht theo mc sch bn tin s dng v che chn chng gi bay, ma tri.

dm dng cho b tng l loi dm nghin dp t thin nhin m bo cht lng theo quy nh tiu chun TCVN 1771-1986 " dm, si dm, si dng trong xy dng". C ht 1x2cm, TCVN 1771-1987. Mc ca xc nh theo nn dp trong xi lanh h s (105N/m2) trng thi bo ho nc khng di 1,5 ln i vi b tng mc di 300.

Nc s dng trn hoc bo dng b tng s c kim tra bng cc phng php m t trong TCVN 4506-87 hoc tng ng. Nc c cha trong cc b khng bn. Dng bm bm cp nc.

d, Trn va b tng:

B tng c trn ti trm trn b tng thng phm ca cng ty TNHH Phc Tin Nam Sn An Dng Hi Phng.

T l trn ct liu p dng ng theo ng cp phi mu th nghim v mc b tng.

Va b tng c trn bng trm trn v my trn ngoi cng trng.

Ct liu c ong o m chnh xc ng t l trc khi a vo my trn.

Ph gia ch c dng cho va b tng khi c s ch nh ca nh thit k v cn b t vn gim st.

e, Vn chuyn va b tng:

- Khi trn btng bng trm trn Nh thu s vn chuyn bng xe Mix

- Khi trn bng my trn ngoi cng trng th vn chuyn va b tng bng xe ci tin, thng i, xe y mt bnh. - Trong khi vn chuyn khng lm cho va b tng b phn tng v mt nc.

- Khng vn chuyn qu lu, qu xa b tng b phn tng. f, , m b tng:

Cng tc m phi ng k thut, khng c ko hoc gh m vo ct thp v c bit ch ti cc gc cnh ca kt cu, cc chi tit ch sao cho khi d vn khun ra b mt b tng khng b r, cc chi tit ch khng b sai lch.

Khi khng va b tng ri t do cao >1,5m, dng mng tn dn va b tng ti ch cn .

m cht b tng bng my m (m di, m bn, ..) m su m bo cc lp b tng y v thnh lin kt cht, khng c cc ch b xp t ong gy r r . m ti khi b tng ni nc b mt l t yu cu.

g, Mu th b tng

c ly ra t mt m trn, m trn ny c ly bt k c tnh ngu nhin v mu th c c lm ba mu. Mu th b tng c lu v bo dng ti cng trng cng vi iu kin bo dng ca cu kin b tng. Trong qu trnh b tng nh thu s tin hnh ly mu thng xuyn th nghim theo qui nh trong h s mi thu. Mi t mu gm ba vin mu vi kch thc tiu chun mi vin l: 150x150x150 v trn mu phi ghi r ngy, thng, nm, cng trnh, st (Trong : Ba vin th nghim tui 7 ngy v ba vin th nghim tui 28 ngy). S lng t mu qui nh ly theo khi lng nh sau:

i vi cu kin chc nng c lp c khi lng nh, ly khng t hn mt t mu cho mt cu kin. C 25 m3 b tng ly mt t mu Nh thu s m bo cng b tng thc t tui 28 ngy theo ng qui phm Nh nc qui nh v phi trnh kt qu th nghim cho t vn gim st v Ch u t bit.

h, Cng tc bo dng b tng:

Cng tc ny c p dng, quan tm i vi khi lng btng ln. Gp thi tit khng thun li phi c bin php c th cho tng trng hp. Ti nc bo dng b tng hng ngy bng nc sch. Bo dng b tng trong 5 n 7 ngy (mi ngy 3 n 5 ln bo dng) cho n khi lp t h mng th thi bo dng. (V mi trng t cng bo dng m b tng)

IV/ Cng tc nghim thu cng hpCng tc bm ht nc lm sch h mng

- Mi phn on nghim thu di 40m 100m (Tu thuc vo khong cch gia cc ga thm) v c xy chn li.

- Sa sang h thng rnh dc hai bn tuyn m bo nc thot ra h thng thot nc ca thnh ph c r rng.

- Dng 02 my bm ti hai u h ga (thuc phn on nghim thu) ra h thng rnh dc trn.

- Sau khi bm nc cn tin hnh dn dp bn t v cc cht thi khc cho h mng sch s.

Cng tc m bo nh sng v dng kh cho qu trnh nghim thu.

- m bo nh sng cho phn on nghim thu chng ti tin hnh mc 4 bng n chiu sng kt hp nh sng ca n pha di ng theo on nghim thu cho mi phn on nghim thu.

- m bo cho vic thng kh cho qu trnh nghim thu, do mi phn on nghim thu c 2 h ga nn chng ti tin hnh m np cc h ga m bo cho vic thng kh v nh sng cho phn on nghim thu, ng thi m bo cc kh c trong lng cng khng nh hng n con ngui trong qu trnh nghim thu chng ti s tin hnh bm cn nc trc 1 ngy cho cc kh c thot ra bn ngoi ht.

- Trong trng hp khng dng kh cho qu trnh nghim thu v sa cha chng ti s cung cp cc thit b dng kh (bnh th OXY) vic tin hnh nghim thu c an ton.

- Cc thit b m bo dng kh ny chng ti chun b v s cung cp ngay nu c yu cu.

Cng tc m bo giao thng i li, cc thit b an ton trong qu trnh nghim thu.

- Chng ti s b tr h thng thang xung ti cc v tr h ga m bo cho qu trnh i li ln xung nghim thu c thun tin.

- Ti cc v tr h ga chng ti s b tr cc tm g lm cu i li qua ch c h ga c d dng v an ton.

- Chng ti s cung cp cc thit b bo h (m, ng ) m bo cho qu trnh nghim thu c an ton

Ni dung nghim thu:

Tiu ch p dng cho vic nghim thu: p dng mc 5.15.2( kim tra cc ng ng khng p)

- Theo tiu ch k thut cc on ng t tiu chun nghim thu nu lng thm bao gm lng thm vo cc h ga trong 30 pht khng vt qu 0.5 lt/ mt di/mt kch thc danh nh. Do cng hp trong d n ny l 2 cng c kch thc 1,5 x2 m nn mi bn c coi nh l 1 ng ng c kch thc 1.5x2 m vy cng hp t tiu chun thm nu lng thm bao gm lng thm vo cc h ga trong 30 pht khng vt qu 1.0 lt/ mt di/mt kch thc danh nh.

- o lng nc thm vo trong lng cng hp tin hnh dn nc xung cc h ga dng thc o hoc dng vt thm ht nc nh tm mt bt bin ri x vo cc bnh v tin hnh o lng nc thm .

- B tr lng thng cha nc thm khi nghim thu l 6 thng th tch Vthng = 20lt.

- Cc v tr thm ln c th quan st c bng mt thng c chp nh v nh du bng sn sa cha m bo lng thm theo yu cu ca tiu ch k thut.

- xc nh c v tr cc thm bn ngoi thnh cng hp dng thc dy 50m o cc v tr c nh du bng sn bn trong n tim h ga c kch thc l A. khi o t tim h ga ra kch thc A v o ln ta s xc nh c v tr cc l thm.

- m bo gi n nh cho thnh h o trong qu trnh x l thm ta dng bao ti ct p chn xung quanh h o v c hng ro, bin bo bo hiu.(chi tit th hin trn bn v)

Phng n sa cha:

- Cc khuyt tt trn b mt b tng nh r b mt, r g nc qua thnh cng c sa cha nh sau:

+ Cc im b r b mt nhiu trn thnh cng, r n khng su vo thnh b tng v khng thm nc, s l bng cch c ra vi din tch b r v c trt li bng va xi mng ct vng t l 1:2 trn vi SIKA FLEX to thnh va khng co ngt lm lp trt khng b rn nt;

+ Cc im r nhiu b r r nc trn thnh b tng cng c x l nh sau: trc ht tin hnh o ct ngoi thnh cng khng nc thm qua, to b mt x l c kh ro, sau dng khoan b tng vi mi khoan 10 12 khoan cc l su vo thnh khong 15cm to ng dn vi khong cch cc l t 7cm n 12cm, ri dng bm p lc cao bm va xi mng ct t l 1:2 c ph gia trng n, bm va vo cc l khoan n khi no va xi mng c thm chy ra cc l ln cn th thi, sau dng va ny trt mt ngoi khu vc x l to b mt.

BiN PHP Thi cng cng trn D500 v h ga d1000 trn tuyn

I/ cng BTct d500, H ga d1000 c sn..

- Cng trn BTCT D500 c nh thu t mua ca Cng ty TNHH Thin Ho - Qun Kin An - TP Hi Phng. Cng c sn xut trn dy chuyn c cng ly tm.

- Trn va h s dng cng c ti trng H10 v i vi cng ct ngang qua ng, s dng cng c ti trng H20.

- Vt liu cng trc khi a vo s dng s c kim tra xut xng theo tiu chun TCXDVN 372:2006 v kim tra ng chng loi, kch thc v c trng k thut.

- Mi ni ca cng D500 l mi ni: Xm bng ay tm bitum, bn ngoi trt va mc M100 vi xi mng Pooclng PC40.

- Cng trn c lp t v nghim thu tun theo tiu chun TCXDVN 372:2006 v theo tiu chun BS5911 phn 100 v phn 120 nh nu trong Tiu ch k thut ca H s thu.- H ga c sn D1000 c nh thu c sn ti cng trng theo bn v c ph duyt cho 2 loi h ga Loi 1 v Loi 2 v tun theo tiu chun TCVN - 4452, 1987 Kt cu b tng v btng ct thp lp ghp Quy phm thi cng v nghim thu

- Np ga gang Nh thu d kin s dng ca cng ty C phn c Tn Long - H L Hng Bng Hi Phng. Trc khi tin hnh thi cng, nh thu s trnh d Ch u t v T vn gim st ph duyt.

II/ Thi cng lp t cng trn.

II.1 iu kin thi cng

- Cng tc thi cng cng trn c tin hnh sau khi thi cng xong cng hp, m ct nn ng, nn va h do iu kin mt bng khng nh hng nhiu n qu trnh thi cng cng trn (mt bng c gii phng thi cng cc hng mc trc nh cng hp, p ct nn ng v va h).

- Nh thu s tnh ton khi lng cng trn, h ga trn tng on b tr tp kt ph hp, khng nhng ni qu nhiu hay ni qu t.

II.2 o mng.

- Cng tc thi cng cng trn s c tin hnh thi cng t im C (cui h D Hng) m im D (ng Nguyn Vn Linh).

- Khi thi cng ct nn ng n ct nh cng (khong +3.50 n +3.60m ) th dng li tin hnh cng tc o t v lp cng trn D500 hai bn va h chy theo chiu di mng.

- Trc khi o mng chng ti cho trc c li ton tuyn, xc nh cao tuyn cng, nh v trc tuyn cng v cao , cc mc gi kim tra khi cn thit, nh v v tr cc h ga, cc ga thu v b tr hp l cc on ni cng.

- nh v b rng mt h o, y h o my xc d thao tc khi o t.

- Trong trng hp cn thit, cc v tr mng ct in hoc cc cng trnh lin k trong phm vi trt t khi o h mng chng ti cho tin hnh x l c ct p ng cc tre trc khi o ( do chiu su t cng khng ln, t 0,6m n 1,3m).

- Dng my o gu nghch c dung tch gu 0,25 m3, t o c sang bn cnh h o v pha st mt bn ng, va h thun tin cho cng tc lp t v m bo khng b nh hng n cng tc thi cng lp t tuyn cng cng nh giao thng ca ngi dn (Kch thc h o c th hin trong bn v thi cng).

- Cn i lng t d tha sau khi lp vn chuyn vn chuyn i ni khc, trnh lng t tp kt qu nhiu trn mt bng.

- My o, o n u chng ti cho sa bng th cng ngay n , to rnh thu, ga thu nc m bo gi cho y mng lun kh, trnh ho bn y mng.

- Sau khi lm phng y mng, tin hnh m s b b mt y mng bng m cc, kim tra cao , cht y mng m bo, tin hnh nghim thu trc khi tri m ct lt y mng cng.

II.3 Lt ct y cng

- Ct lt cng dng ct vng sch, m lp lt bng m cc bo m dm cht K>=0,95.

- dy lp lt sau khi m xong l 30 cm.

- o ly du v tr ming bt trn y cng.

- Ti v tr nh du, o h thao tc.

- Kim tra ct ca lp lt bng my thu bnh sau khi m cht

II.4 H cng

- Dng xe ti c mc cu vn chuyn cng v ph kin n cng trnh.

- Dng xe ti c mc cu hoc Palng 3-5 tn h cng.

- Dy nng h cng dng cp la, dy vi, ti v tr buc cp dng tm m cao su trnh lm hng lp bo v ng.

II.5 Lp cng

- Sau khi thi cng o t h mng v c nghim thu bi t vn gim st, dng my xc, h cng xung h mng

- Tin hnh lp ghp cc ng cng b tng vi nhau, vt liu dng lm mi ni l dy ay tt : Si ay chnh l v ca cy ay c sn xut sau khi ngm nc vi thng (3-6 thng) v c r sch, phi kh, cc si ay ny c bn cht theo kiu bn thng vi ng knh ph hp khe mi ni cn lp ghp. Nha ng c nu si trong khong 1000C- 1200 C ri tin hnh nhng tm nha ng cho l dy ay bn trong thi gian khong 5 pht cho nha ng thm k vo ay, sau tin hnh ct cc on ay vi chiu di bng chu vi cng trn, cc cng nhn dng cc loi dng c nh ba, di che nm ng cht cc on ay vo mi ni n khi khng th vo c na.

- Chnh li tim cng , dng vt liu chn cng khng b ln chch khi tim, trc.

- Dng xi mng ct vng mc 100 (S dng xi mng PC40) trt cc u mi ni hon thin theo yu cu.Thi cng ng cao trnh t cng:- Cao trnh t cng ti hin trng c xc nh da vo cc im mc cao lm chun do Ch u t v n v T vn thit k cp trong qu trnh bn giao mt bng, hoc cc im mc cao c n v thi cng gii thiu vi s cng nhn ca Ch u t v thit k. T cc mc cao chun ny chng ti tin hnh xy dng li truyn dn cao c cc tuyn truyn dn song song vi cc tuyn ng nhm to ra nhiu im mc chun khc s dng trong qu trnh thi cng.

- Trong qu trnh thi cng t cc im mc trn li truyn dn ni trn chng ti t my thu bnh. Mt khc li dng mia ti u mi ng ang lp. Khi lp ng xong s iu chnh cao nh ng chnh xc theo yu cu vi cng thc.

H1 + h = HTK + M

H1: Cao im mc t my; h : Chiu cao my

HTK: Cao nh ng thit k

M : Chiu cao mia (s dc mia thun)

HTK = H nh ng + D + 2d

D : ng knh ng; d : Chiu dy ng

Kim tra mi ni v cng tc lp t:

- Dng my kinh v, thu bnh kim tra ct t ng, dc thu bnh. Lp bin bn nghim thu cng ch u t xong mi c chuyn giai on thi cng.

II.6 Thi cng lp ct en

- Vic san lp ct en ch c tin hnh sau khi h ga v cng trn c lp t v nghim thu ng quy nh.

- Phn lp ct en 2 bn ng cng c san lp bng th cng thnh tng lp dy 30 phn, san u 2 bn ng cng, ti m v tin hnh m bng m cc n chiu dy ti thiu cao trnh lp ct en cao hn mt trn ca cng l 25 cm.

- Phn lp ct en pha trn c san gt nh nhng bng my xc, dng my m cc m mt m bo cht theo yu cu thit k cho tng lp.

III/ Thi cng h ga

- H ga trn on C-D c 2 loi

+ Loi 1: C l ch u ni vi h thng thot nc nh dn

+ Loi 2: C l ch u ni vi h thng thot nc nh dn v cng hp BTCT.

III.1 o mng.

- Cng tc thi cng h ga c tin hnh song song vi cng tc thi cng cng trn, cng thi cng n u, tin hnh thi cng h ga n y.

- Trc khi o mng, dng my kinh v xc nh chnh xc v tr cao to ca h ga, t nh v b rng mt h o, y h o my xc d thao tc khi o t.

- Trong trng hp cn thit, cc v tr mng ct in hoc cc cng trnh lin k trong phm vi trt t khi o h mng chng ti cho tin hnh x l c ct p ng cc tre trc khi o.

- Dng my o gu nghch c dung tch gu 0,25 m3, t o c sang bn cnh h o v pha st mt bn ng, va h thun tin cho cng tc lp t v m bo khng b nh hng n cng tc thi cng lp t tuyn cng cng nh giao thng ca ngi dn (Kch thc h o c th hin trong bn v thi cng).

- Cn i lng t d tha sau khi lp vn chuyn vn chuyn i ni khc, trnh lng t tp kt qu nhiu trn mt bng.

- My o, o n u chng ti cho sa bng th cng ngay n , to ga thu nc v bm thot nc m bo gi cho y mng lun kh, trnh ho bn y mng.

- Sau khi lm phng y mng, tin hnh m s b b mt y mng bng m cc, kim tra cao , cht y mng m bo, tin hnh nghim thu trc khi tri m ct lt y mng cng.

III.2 Lt ct y mng

- Ct lt cng dng ct sch, m lp lt bng m cc bo m dm cht K>=0,95.

- dy lp lt sau khi m xong l 20 cm.

- Kim tra ct ca lp lt bng my thu bnh sau khi m cht.

III.3 H h ga.

- Sau khi thi cng xong lp ct lt, tin hnh thi cng h h ga.

- Dng cu KH162 tin hnh h h ga xung nn ct c m cht, cn chnh h ga theo ng, cao ta , v tr thit k.

- Cng trn c u ni vi h ga, gia cng v h ga c m bng giong cao su.

- Sau khi lp t xong h ga v mi ni vi cng, tin hnh nghim thu vi T vn gim st v cao, to v mi ni mi c chuyn sang thi cng sang giai on tip sau.

III.4 Thi cng lp ct en.

- Phn lp ct en xung quang h ga c san lp bng th cng thnh tng lp dy 30 phn, san u 2 bn ng cng, ti m v tin hnh m bng m cc

IV/ Tiu chun nghim thu

- Cng s c thi cng theo tiu chun BS5911 phn 100, 120 v tiu chun Vit Nam TCXDVN 372-2006 cng nh trong Tiu ch k thut ca H s thu.Thi cng ng giao thng I/ Vt liu v my mc thc hin thi cng

a, Vt liu s dng:

- Ct en sng Hng c Nh thu mua ti cng.- Cp phi t i c mua ti m Ba Ph ( Li Xun- Thu Nguyn HP)

- Cp phi dm loi 1 v loi 2 c mua ti Mua ti m Minh c (Thu nguyn-HP) c vn chuyn v cng trnh bng t.- Ct vng Vnh Ph c mua ti cng.

- dm b tng Kinh Mn Hi Dng c mua ti cng.

Tt c cc vt t, vt liu trn trc khi a vo cng trng u c kim tra cht lng v nh k ly mu vt liu gi n phng th nghim Las09 - Bch ng gim nh cht lng.

b, My mc thit b tham gia thi cng:

- My o PC200: 01

- My i t hnh: 01

- My san t hnh: 01

- My ri: 01

- t vn chuyn5-10 tn : 05

- Lu bnh thp 6-8 tn: 01

- Lu bnh thp 8-10 tn: 01- Lu rung 14-25 tn: 01

- Lu rung 20-44 tn: 01

- Lu bnh lp 25 tn: 01- Xe tc phun nc, bm c vi ti bng tay, bnh ti th cng...

II/ Thi cng san nn bng ct en

a, Bin php thi cng.

- Qu trnh lp ct en nn ng trong phm vi h o cng hp c tin hnh song song vi qu trnh thi cng cng hp, khi thi cng xong tng phn on, ct en c lp tr h mng v c m cht tng lp 30 cm mt bng lu loi nh (1,5 tn) kt hp vi m cc. Qu trnh th nghim ly cht cly cho tng lp cho tng phn on.- Ngoi phm vi h mng (phn va h), s dng my xc vt ht lp rc thi xy dng v ht lp bn nh bn v kho st thng 5/2007 ln xe ch n bi theo quy nh, ct en cng c lu ln, m cht tong lp 30 cm mt.- Ti nhng v tr gn cng trnh nh dn, bin php o vt c ht sc ch v gia c bng h cc U180 v vn tn trnh lm nh hng n cng trnh ca h. Cng ti nhng v tr ny khi lu m Nh thu cng s dng loi lu nh kt hp vi m cc.

- Qu trnh thi cng nn ng c thi cng song song vi h thng thot nc dc D500, Nh thu cng Ban qun l s phi hp vi chnh quyn a phng v nhn dn u ni h thng thot nc ca dn vo cc h ga D1000 trn h thng cng ny. Mt khc nn ng li c thi cng vo ma kh, do lng nc mt l khng nhiu, Nh thu s to mt rnh dc (ngoi phm vi nn ng v va h) lm rnh thot nc t thm trnh nc chy trc tip vo lm nh hng n kt cu nn.

b, Kim tra v nghim thu

Sau khi m cht tng lp 30 cm, ct nn s c kim tra cao , chiu rng, dc v m cht theo tiu chun Vit Nam TCVN 4447-1987.

Cng tc th nghim v cht do phng th nghim Las 09 Bch ng thc hin.

III/ Thi cng lp t i dy 30cm

a, Bin php thi cng.

Cng tc chun b chung:

Cng tc ny s thi cng vo nhng ngy kh ro, nhit khng kh cao hn 15oC.

Ln ga, cm cc nh dng nn.

B tr my mc, thit b, nhn lc cn thit.

Chun b vt liu:

Sau khi cc ch tiu c l ca t m c K s t vn chp thun, Nh thu tin hnh gia cng s b bng my i iu chnh thnh phn ht. My i san gt v ri u vt liu thnh lp dy khong 30cm sau li gom li thnh ng.

My xc s xc cp phi t i qua gia cng s b ln t v vn chuyn n v tr thi cng. t t vn chuyn cp phi s chy vi tc khng qu 30km/h m bo cho cp phi khng b phn tng.

Cc ch tiu c l cp phi t i t nhin chn lc s c Nh thu tun th cht ch theo yu cu ca h s mi thu v tiu chun hin hnh.

B tr my thi cng:

y chng ti s dng kt hp 2 loi lu bnh thp v lu rung bnh lp trng lng 20-44 tn, c im ca lu rung bnh lp l chiu su tc dng ln, lu bnh thp c chiu su tc dng nh (20 - 25 cm ) nhng c kh nng to mt v cn phng ct, trnh t lu ln nh sau:

+ My i v my san, san t thnh tng lp 30cm.

+ Dng lu 8-10 tn lu s b 2 - 4 lt / im.

+ Dng lu rung 20-44 tn m ln n cht K 0,98 (4-6 lt/im).

+ Hon thin b mt bng lu bnh lp 2-4 lt/im

Trnh t thi cng:

Dng my san t hnh san cp phi i thnh tng lp dy ~30 cm theo chiu di 100m dc theo tim tuyn ung ri tin hnh san phng. Trong qu trnh p, m s c kim tra ti hin trng lin tc ph hp vi cht, n nh v ng u ca nn p. Khi san t lun m bo b mt bng phng, to dc thot nc tt chng li cc h hng do phng tin thi cng gy ra.

Dng lu bnh thp 8-10T, sau dng lu rung 20-44T. Sau cng dng bnh lp hon thin.

Ti nc thng xuyn trong qu trnh lu ln, m bo m thch hp cho cp phi t i.

Dng my san t hnh san t thnh lp dy ~30cm vi chiu di thi cng t 100m dc theo tim ng. Sau khi t c san phng tin hnh m s b 4-5 ln / im ng u trn sut b rng nn ng. Khi m vt sau phi ph ln vt trc t nht 20 cm.

b, Kim tra v nghim thu

Sau khi m cht lp t i s c kim tra cao , chiu rng, rng v cht theo TCVN 4447-1987.

C 200 m3 vt liu, Nh thu s tin hnh ly 03 mu th nghim v m cht v th nghim ny phi c tin hnh n su ca lp t . ti cc khu vc lp t, ct xung quanh cc kt cu hoc trong cc ho cng, t nht phi tin hnh mt th nghim cho mi lp t hon thnh. Th nghim kim tra cht t ti hin trng kt hp 2 phng php: dao vng v phng php phu ct, tu thuc vo loi t ng dng tng phng php no cho ph hp. Ly mu th nghim trong phng kim chng iu chnh kt qu hin trng.

IV/ Thi cng lp cp phi dm:

- Lp mt ng dm ca KC1 c thi cng thnh 2 lp, lp mt di (loi 2) dy 24 cm, lp mt trn (loi 1) dy 15 cm.

- Theo tiu chun 22 TCN 334-06 (iu 3.2.3) Chiu dy sau khi lu ln khng nn ln hn 18 cm i vi lp mt di. Do vy chia lp mt di loi 2 thnh thnh 2 lp c dy ln lt l 14cm v 10 cm.

a, Bin php thi cng.

Chun b lng ng

- Sau khi thi cng v nghim thu xong lp cp phi t i s tin hnh thi cng ngay lp cp phi dm ngay.

Ri dm:

- Dng t vn chuyn cp phi dm n v cho my san san to phng vi h s lu ln ly l 1,3.

Lu ln lp cp phi:

- Trc khi lu ln, nu thy cp phi dm cha t m Wtn th ti thm nc. Trong qa trnh lu c th vn tin hnh ti m b li lng nc bc hi.

- u tin lu s b bng lu bnh st 6-8 tn vi 3-4 ln/im

- Dng lu rung 14 tn lu t 8-10 ln/im

- Lu bnh lp vi ti trng bnh t 2,5-4 tn, lu 20-25 ln/im

- Dng lu bnh st 8-10 tn to phng

b, Kim tra v nghim thu

Qu trnh thi cng v nghim thu c tun theo tiu chun 22 TCN 334-06

- C 1000m3 vt liu ly mt mu kim tra cho mi ngun cung cp hoc khi c s bt thng v cht lng vt liu.

- C 200 m3 hoc 1 ca thi cng cng phi ly mt mu th nghim thnh phn ht v m.

- C 800m2 tin hnh ly mu th nghim kim tra cht lu ln ti v tr ngu nhin.

V/ mt s vn cn ch khi thi cng ng giao thng.

Cng tc o t khun ng c tun th Tiu ch chung cho Cng tc xy dng. Lun bo m thot nc b mt l tt nht trong mi iu kin thi tit.

t p phi c m thch hp, nn t kh phi dng nc ti di dng sng m, t th phi phi thm.

- Do iu kin mt bng thi cng ng giao thng qu gn cc cng trnh nh dn (ch yu l nh cp 4, nh tm), khong cch t mp va h n nh dn khong 2,5m nn khi s dng lu rung m ct cng nh cc lp o ng cn c bit ch gim lc rung v tng thi gian lu khi lu pha mp ngoi va h. Nu qu gn c th s phi dng m cc m thay th.

- Trong qu trnh thi cng, Nh thu lun ch n n cao , bng phng ca lp mng b ph cho kp thi, c bit ch on siu cao trn ng cong v ng dc, lp mng thi cng ng kch thc hnh hc s quyt nh kch thc chnh xc ca lp mt.

thi cng va h, b tng lt b va v lp t b va

I/ Cng tc thi cng b tng lt b va:

- Cng tc thi cng b tng lt b va khi thi cng xong lp kt cu dm.

- B tng lt b va l b tng mc 100 theo kch thc thit k (xem bn v thi cng).

- Do khi c khi lng nh v khng tp trung v vy chng ti ch s dng my trn c dung tch 350 l d c ng trn mt bng cng trng.

- B tng c trn bng my trn m bo mc va theo thit k, do, st v cc tiu chun ca b tng.

- Vn chuyn b tng bng xe y tay 1 bnh chuyn dng cho b tng.

- B tng phi nht thit kp cp pha 1 bn pha va h, khng xp gch thay cp pha.

- B mt b tng phi cn phng mt v ct thun tin khi lp t tm va b tng.

II/ Cng tc thi cng lp t b va khng an rnh:

- B va b tng c chng ti gia cng ti xng bng khun thp v m bng thit b rung v vy m bo c cht lng, k m thut, nhn b mt. Cc ng cua c gia cng b va ring m bo ng ln v tnh m quan ca cng trnh.

- Bt mc ton tuyn trc khi lp t b va .

- Lt va n u lp t b va n , va phi do.

- Khi lp t xong chn va mt ngoi pha va h gi chn.

- Do cha lt va h v vy sau khi lp t b va xong phi chn t pha ngoi qu 1/2 chiu cao vin b va gi b va.

II/ Thi cng va h

- Cng tc thi cng va h c tin hnh sau khi thi cng xong b va. Va h c lt bng gch c kch thc 30x30x5cm s dng b tng xi mng mc 200, c nh thu c ti bi trn cng trng.

- Khi thi cng xong b va, tin hnh m lp ct trong phn va h n ht cao lp ct t K95, sau thi cng lp t i dy 30cm K95.

- Ri 1 lp ct en v m cht dy 5cm.

- Trn va M100 bng th cng hoc my trn 250l v ri 1 lp dy 2cm ri tin hnh lt gch va h.

- Cng tc hon thin s c tin hnh sau khi thi cng xong h thng in chiu sng v h thng cy xanh.

Thi cng mng in, ct n chiu sng v cy xanh

i/ Thi cng ho cp in.

- Dy chuyn thi cng cp in chiu sng c tin hnh lin sau khi lp lm ng giao thng, va h.

- Tt c cc thit b trc khi a vo lp t v vn hnh u phi c kim tra, hiu chnh m bo ng tiu chun k thut.

a. Cng tc o ho t cp

Khi o ho khng c o ng thnh m o vt gc khong 300 , nu gp t d st l th dng vn, hoc tn mng v ng cc .

Khi o ho pht hin hoc nghi ng c ng dy cp nm di, o n 0,4 m khng dng cuc m dng xng tip tc o. Gp ng cp c hoc cp thng tin phi thn trng khng lm xy xc v dng n g, tre v thng treo cp.

t o ln c xa ming ho 0,3 m trnh t ri xung ngi.

b. Cng tc ri cp ngm:

Trc khi ri cp phi k m t cun cp cao hn mt t, nn t phi phng, nu t ch t ln th k vn vo chn m phng trng hp ang quay cun cp b lt ngang hoc m.

Khi vn chuyn v ra cp theo phng thng ng. Khi ra cp phi quay t t, va quay va ch c hin tng g tr ngi khng, thy vng phi dng li kim tra ngay.

Ch huy cng trng ri cp ph bin tn hiu bng ci cho tt c cc cng nhn tham gia ri cp.

- Ri v ko cp:

L cp c t trn thit b ra cp chuyn dng.

B tr ngi v con ln ko cp.

Cp lun c t trn con ln trc khi ko.

Cp khng c tip xc vi t trc v trong khi ko khng lm xc cp.

Trnh khng cho cp b cc lc c hc ln tc dng ln trong qu trnh ri v lp t cp.

Cp c ri c chng 3% v mi hp ni c d phng hai pha: 2 x 1,5m=3m

Bn knh un cp >= 1,4 m

Cc on tuyn i men theo ng hoc theo va h:

Cp c lun vo ng nha v c chn xung t su 0,8 m, pha di ng cp ri 1 lp ct en dy 0,1 m, pha trn ri tip 1 lp ct en 0,2 m, tip theo l mt lp gch ch bo v chng va p c hc, mt 9 vin cho 1 m di. Pha trn ri mt lp t mn 0,3 m ri t 1 lp bng cnh bo cp, trn cng l lp t bnh thng v lm li va h t yu cu v hnh thc, cht lng v c c quan qun l chuyn ngnh chp thun.

ch h ga thot nc, tu theo iu kin cho php c th t cp di h ga, t cp ngang h ga (trong ng nha chu lc ( 150 mm) hoc r ra mp trong h ga nu va h cn rng. Khi r cp phi r t xa hn 3 m m bo bn knh cong cho php.

- Cc on tuyn ct ngang ng t, xe la:

Lun trong ng thp m km 150 x 5,5mm , su 1m. ng lun cp c t su trong va h mi bn 2m, ring on chui ng 5 mi ang xy dng s lin h vi Ban qun l ng 5 t ng thp xuyn qua ng trc khi lp t cp.

- Trn tuyn cp u c mc bo hiu tuyn cp, hng cp, hp ni cp bng gch b tng trn mt t gip vic qun l vn hnh c d dng.

- Vic lp t cc hp ni cp, phu cp n v thi cng tun th cht ch hng dn lp t trong bn v thi cng v hng dn lp t ca nh ch to.

- Sau khi lun cp, u ng thp, ng nha xon c bt bng bitum v si ay trnh trng hp t chui vo trong ng.

- Thi cng cc t in, ct thp c ni vi h thng tip a an ton 1 cc L63x63x5 2,5m vi Rat ( 10(. H thng tip a ny c ni vi trung tnh ca ngun in ti bng in bng dy ng mm M16. in tr tip t ca h thng in cc tip t phi nh quy nh trong cc tiu chun Vit Nam lin quan.

- Ton b cng tc lp ct ho cp in phi c s gim st ca n v T vn gim st ng cho lp chng ti mi cho lp ho cp.

- Khi lp ho tuyt i khng cc vt cng, nhn v sc vo trong ho nh kim loi, inh, gch v..... v cc dng c khc nh cht ho hc s lm h hi n lp bo v ca cp. Tin hnh lp ho theo ng thit k.

II/ Thi cng lp t ct in:

o h mng ct:

+ Trc khi tin hnh o mng, phi dng my trc c kim tra xc minh chnh xc cc cc tim, mc ca v tr nh o. Mi v tr c mt cc tim, hai cc phn gic, hai cc bo v hng trc sau. Cn c vo tim mc, gic mng theo quy phm.

+ Khi o nu gp s dng my nn kh ph . Nu gp cc cng trnh ngm phi dng li xin kin gim st, thit k , khi c kin thay i mi tip tc thi cng.

+ o theo th cng ng kch thc, di, rng su theo bn v thit k v t o ln phi ht ra ming h 0,5m khi b tng t trn b khng ri xung b tng. Nu gp nc ngm phi x l h mng c rnh thot nc xung quanh v h ga thu nc. Phi bm nc thng xuyn trong qu trnh b tng mng cho n khi ng kt b tng.

+ San mt bng tp kt vt t, vt liu b tng mng.

+ Khi trn dng my trn. Yu cu vi vt liu b tng, cc yu cu khc v k thut thi cng b tng, cp pha nh nu trn phn xy lp. Khi xong ton tuyn, phi kim tra hon cng bng my kinh v, thc mt sn nh du tuyn vo hai bn mp mc ct. Cn c vo hon cng mng v lm tim tuyn khi dng ct.

- Trc khi lp dng ct, cc mng phi lp c t n phn c mng chc chn.

B mng ct n c thi cng b tng ti ch. Cc v tr bulng s c thi cng chnh xc so vi chn ct .

Dy in trong ct n s c lun trc khi thi cng trc khi lm ng giao thng.

Ct n c cu lp bng cn cu: Dng cu t hnh ch ct ti cc v tr lp ct nh sn th tin hnh cu lp, ln lt cho n ht. Khi h m bo ct phi thng ng, ngm bng my, qu ri theo hai phng v c bt bu lng chc chn i vi loi ct n bng thp.

Cc thit b in nh ct, dy in, n, ng cp S c Nh thu trnh nh cung cp, cht lng sn phm trc khi tin hnh thi cng

iii/ Thi cng h thng cy xanh.

- Trn on ny h thng cy xanh to bng mt l cy: Keo tai tng.

- Hai bn h c chiu rng l 3m, xy b va h trng cy bng gch c xy nghing bng va Xi mng 100#, rng 1x1m (Chi tit xem bn v thi cng).

- Trc khi tin hnh cng tc trng cy nh thu s hp ng vi cng ty Cng vin cy xanh thnh ph cung cp ging cy v c i ng trng cy.

- t bi cho cc h trng cy l t mu sch.

- Cy sau khi trng s c chm sc bng cch ro bo v v ti nc bo dng sao cho r cy pht trin c nhanh hn.

Phn 4 : H thng qun l cht lng cng trnh

Cc yu t nh hng n cht lng cng trnh:

Yu t ch quan: vt t, vt liu; nhn lc (nng lc, trnh thit k,t chc thi cng, lm th nghim); my thi cng, my kim nh; vn...

Yu t khch quan: thi tit, kh hu, a cht, th trng gi c...

Cc yu t ny gy nh hng n cht lng cng trnh t lc lp d n, thit k cho n khi thi cng xong v c trong qu trnh s dng. Do vy h thng qun l m bo cht lng cng trnh l rt quan trng.

I/qun l cht lng trong giai on chun b:

I.1. Cn b, cng nhn vin thi cng

- La chn ch huy, cn b c trnh , c nng lc thc t, kinh nghim thi cng lu nm. Chn nhn vin, cng nhn thi cng l nhng ngi mnh kho, nhanh nhn, kinh nghim, c chuyn mn vng vng, c thc lao ng.

- Bi dng kin thc nghip v chuyn mn ph hp vi khoa hc hin i.

I.2. Kim tra, hiu chnh h s thit k

Mc ch

Cc cn b k thut ca chng ti s nghin cu k ton b h s thit k, kim tra cc s liu thng k cc d liu cn thit:

Phc v qu trnh qun l, trin khai thi cng

xut, phn nh cc vn bt hp l ( nu c) ra phng n gii quyt (trong gii hn cho php). Phi hp vi Ch u t, T vn gim st c phng n x l m bo khng nh hng ti trnh t thi cng.

Ch ng trong iu tit nhn lc, trin khai thi cng.

Ch ng trong cc cng tc thanh quyt ton hng thng.

Ch ng trong cng tc t chc nghim thu, bn giao cng nh cc kim nh cn thit trong qu trnh thi cng.

I.2.2. Quy trnh kim tra nh sau: Kim tra, kho st a cht cng trnh, a hnh.

Kim tra h s bn v thi cng, khi lng trng thu so vi thc t sau khi kho st chun b thi cng.

Tng hp cc s liu chng ti lp bo co gi T vn gim st v Ch u t phi hp cng x l.

I.3. Qun l cht lng bn v bn thi cng

- Lp bn v thi cng y , ph hp vi mt bng, a cht hin trng thi cng, ph hp v t chc thi cng, ph hp vi tng tin thi cng.

- Bn v phi th hin cc quy trnh p cc, s di chuyn my, s qui trnh gia ti v d ti, thao tc chun tc m bo an ton cho ngi v my mc thit b thi cng.

- Bn v thi cng phi c thuyt minh y km theo.

I.4. Qun l cht lng xe my, thit b thi cng

- Xe my phi ph hp cng trnh, k thut tin tin, tnh nng tin cy, s dng an ton, thao tc thun li, bo dng d dng.

- Tnh nng phi p ng yu cu cng vic, m bo tin thi cng ra.

- Hp l s dng my, thao tc chnh xc, nh trch nhim v tr cng tc.

I.5. Qun l cht lng phng tuyn trc c:

- Lp li li khng ch trc c thi cng: To im u ca li khng ch thi cng, mng li thu chun khng ch cao , v tr chn cc mc chun...

I.6. Qun l cht lng vt liu, cu kin:

Quy trnh theo di, kim sot nguyn vt t:

n v thi cng s lp quy trnh chi tit tm hiu la chn, mua sm, qun l cht lng v qun l nh cung cp cc vt t, vt liu cho cng trnh. Ni dung nh sau:

Chun b k hoch mua sm:

Cn c vo cc tiu chun thit k, hoch nh cht lng cho cc vt t, vt liu chnh, ph cho ton cng trnh.

Chun b y hoc c k hoch chi tit v vic tm cc i tc tiu chun phi hp kim sot, kim tra cc vt t, nguyn vt liu a vo thi cng.

m bo s tng thch gia quy trnh sn xut, lp t, kim tra th nghim v h thng cc vn bn p dng i vi cng trnh.

Tm hiu, nh gi th trng

Cn c vo cc d liu nguyn vt liu bao gm:

Chng loi

Cp, kiu

Du hiu chnh xc theo yu cu ca thit k

B phn qun l v cung ng vt t ca cng trnh s tm hiu cc ngun cung ng ti a phng, v tnh thnh ln cn c th a ra mt danh sch ngun cung ng s b nhm rt ra danh sch rt gn cc nh cung ng.

Nhn bit, xc nh ngun gc, kim sot sn phm, kim sot qu trnh

Vic xc nh ngun gc ca sn phm l yu cu rt cn thit nhm m bo tnh ng nht v ph hp ca nguyn vt liu do vy chng ti s cng cc nh cung cp lp v duy tr cc th tc dng vn bn nhn bit thng nht cc nguyn vt liu n chic hoc l sn phm.

Quy trnh theo di v kim sot nguyn vt liu c thc hin theo nguyn tc ton b nguyn vt liu chnh phi c kim tra cht lng, chng loi (trnh T vn cc h s v mu) v c s ng ca T vn trc khi a vo s dng.

n v thi cng s lp v duy tr cc th tc dng vn bn kim sot vic kim tra xc nhn, bo qun v bo dng sn phm do khch hng cung cp d dng qun l quy trnh cung ng cng nh cht lng vt liu.

Nh cung ng cn m bo rng cc vt t, vt liu phi c php s dng v lu hnh. xc nh tnh ng n ca cc nh cung cp, cn b k thut ca Nh thu thi cng phi kim tra tn ni sn phm, cung ng ca Nh cung cp v xem xt cc ti liu xc nhn cht lng ca nh cung ng.

Trong hoc sau khi cung ng, khi c yu cu ca Ch u t hoc c quan chc nng, nh cung ng phi trnh cc vn bn cn thit hoc thc hin cc th nghim xc nh s ng n ca vt t, vt liu a vo cng trnh.

Bo m cht lng vt t: m bo cht lng vt t a vo cng trnh n v thi cng s c nhng bin php c th bao gm tt c cc khu t kho st, mua, lu kho v a vo s dng.

Quy trnh kim tra cht lng vt t: I.7. Qun l cc vn khc:

- Lp k hoch thi cng, phng n, bin php thi cng c th cho hng mc, cng vic. Chng ti s hp nh k hng tun c rt kinh nghim, ci tin v ra cc phng n thi cng tt hn hiu qu hn.

- Qun l tin vn m bo vt t, nhn lc, my thi cng huy ng kp thi m bo tin thi cng theo hp ng.

- Cc vn bn, h s xin cp php thi cng ca hng mc, cng vic... c hon thnh np trc cho c quan c thm quyn c cp php trc ngy thi cng hng mc, cng vic theo tin ra.

II/ qun l cht lng cng trnh trong qu trnh thi cng.

C s qun l cht lng:

H s thit k, h thng tiu chun p dng cho thi cng cng trnh.

Cc vn bn php lut quy nh v quy trnh, quy phm v qun l cht lng xy dng c bn.

Nng lc con ngi, nng lc thit b, nng lc ti chnh ca n v thi cng.

Quy trnh qun l cht lng ca chng ti c thc hin nh sau:

II.1. Lp k hoch qun l, kim sot cht lng:II.2. Phn cp qun l cht lng

II.3. Cng tc gim st cht lng ni b ca n v thi cng:Yu cu: Cng tc gim st c chng ti thc hin thng xuyn, khoa hc ti hin trng m bo ngn nga nhng sai phm k thut, bo m vic nghim thu khi lng v cht lng cc cng tc xy lp c thc hin theo ng thit k c ph duyt, theo ng quy chun, tiu chun k thut v cc quy nh v an ton.

Cn b chuyn trch ng nng lc, chuyn mn i vi cng vic c giao.

Ni dung:

Kim tra danh mc, quy cch, chng loi v tnh nng ca vt liu, cu kin.

Kim tra iu kin, bin php m bo an ton thi cng cho cng trnh, an ton cho cc cng trnh ln cn.

Gim st thng xuyn cng tc thi cng xy dng lp t thit b theo chc nng v phn cp thng nht.

Kim tra h thng m bo cht lng, k hoch cht lng, quy trnh v phng n t kim tra cht lng ca cc b phn, cc i, cc t nhm thi cng.

Kim tra tin , bin php thi cng cho tng hng mc.

Kim tra vt liu, cu kin, sn phm xy dng ti hin trng so snh vi cc vt liu, cu kin, vt t, thit b trnh T vn gim st trc khi thi cng nhm m bo s ng nht, ph hp. Theo yu cu k thut, yu cu ca T vn, Ch u t chng ti s ly mu, kim nh cc vt t, thit b ny nhm m bo tnh chnh xc trong thi cng.

Kim tra, xc nhn khi lng, cht lng cc cng vic trc khi bo co Ch u t. Lp cc bo co lin quan phc v giao ban cng trng cng nh bo co ln Ch u t.

Kim tra cht lng ti hin trng v th nghim:

Phng th nghim hin trng c chng ti b tr hoc do ch nh ca k s t vn thun tin cho vic tc nghip. Phng th nghim ny c trang b y thit b th nghim cn thit. Nhng ngi lm vic ti phng th nghim l nhng ngi c y kinh nghim v thng tho cng vic th nghim cc vt liu c yu cu v phi c s chp thun trc ca k s t vn. Cc th nghim trong phng bao gm:

Th nghim m cht tiu chun, xc nh thnh phn v kch c ht ca t.

Xc nh gii hn chy, gii hn do v ch s do ca t.

Th nghim m cht tiu chun v xc nh thnh phn ht ca lp cp phi dm bng phng php rt ct Kim tra cht lng bitum Th nghim cht ti ch.

Kim tra tuyn, cao cc lp kt cu bng my ton c, my thy bnh.

Kim tra kch thc hnh hc cng trnh bng thc thp.

Kim tra bng phng cc lp kt cu bng thc 3m.

Kim tra chiu dy cc lp kt cu bng phng php khoan.

Trong qu trnh thi cng, tt c cc loi vt liu u phi c th nghim, sau gi kt qa v mu cho k s. Cng tc nghim thu n du phi thc hin theo ng quy trnh, quy phm ca B GTVT hin hnh v ch dn ca k s t vn v ch c php chuyn bc thi cng khi k s t vn cho php.

II.4. nh gi hiu qu:

Hiu qu ca quy trnh qun l cht lng c nh gi sau tng cng vic hon thnh. Chng ti s t chc rt kinh nghim mt cch nghim tc nhm nh gi chnh xc hiu qu ca quy trnh i vi tng cng vic t c cch thc iu chnh cho ph hp. Cc kha cnh xem xt n trong vic nh gi hiu qu gm:

chnh xc trong k hoch c lp

Mc ph hp trong t chc, phn cp thc hin

Nhng vn t c v cn tn ti trong vic trin khai thc hin v kim sot quy trnh

iu chnh i vi nhng cng vic hoc hng mc tip theo

Trong quy trnh qun l cht lng, vic lp h thng vn bn, bin bn v cc ghi chp trong qu trnh thi cng bao gm: cc bin bn nghim thu cng vic, thnh phn cng vic v cc hng mc cng trnh, cc pht sinh, cc x l k thut. Ni dung phi cp y cc thng tin cn thit theo quy nh ca k thut thi cng. y s l c s xc nh cht lng tng thnh phn cng nh ton b cng trnh sau ny ng thi cng l c s lp h s hon cng, c s thanh quyt ton.

III/ quy trnh kim tra nghim thu:

Quy trnh ny lun tun theo N209/CP. Trc khi yu cu nghim thu Nh thu s t chc nghim thu ni b v trnh bin bn nghim thu ny lm cng tc nghim thu chnh thc.

Bn v hon cng v tnh ton khi lng s c nh km ngay trong giai on nghim thu cc cng vic xy dng, hng mc cng trnh v cng trnh xy dng.

Quy trnh kim tra v nghim thu thi cng tng phn v ton b cng trnh c tin hnh nh sau:

III.1. Nguyn tc:

Ton b cc cng vic, cc hng mc cng trnh sau khi thi cng xong u c nghim thu trc khi tin hnh cc cng vic tip theo.

Ch nghim thu nhng cng vic xy lp, b phn kt cu, thit b, hng mc cng trnh khi hon ton ph hp vi thit k c duyt, tun theo nhng yu cu tiu chun k thut m bo cht lng theo thit k quy nh.

III.2. C s nghim thu:

C s cn c cho cng tc nghim thu bao gm:

H s thit k thi cng, ton b cc bn v thi cng, ti liu hng dn, ti liu a cht, cc cng vn, vn bn thay i (nu c) ca ch u t v n v thit k trong qu trnh thi cng

Cc tiu chun c ch nh p dng

Cc thng t, vn bn hng dn ca chnh ph, ca B xy dng v cc ngnh

III.3. Nghim thu tng phn, nghim thu tng th:Vic nghim thu tng phn, nghim thu tng th cc hng mc c thc hin theo k hoch sau bi Ban nghim thu c s do ch u t ch tr thnh phn ban nghim thu c s bao gm:

i din ch u t lm trng ban

Cn b k thut gim st thi cng ca ch u t

Ban iu hnh d n (i din cho lin danh d thu)

T chc thit k nu c.

III.4. Trch nhim ca ban nghim thu c s:

Tin hnh nghim thu mt cch thng xuyn: Cng vic xy lp hon thnh

Nhng b phn cng trnh s b lp kn: p cc, ng cc tre, cng hp, cng trn, ng cp nc, mng nh...

Nhng kt cu chu lc quan trng

Nhng giai on chuyn bc thi cng

i vi nghim thu cng trnh a vo s dng phi kim tra: Bin bn nghim thu cc b phn cng trnh n du

Bin bn nghim thu cc b phn cng trnh quan trng

Bin bn nghim thu cc giai on chuyn bc thi cng

Nht k cng trnh

Kim tra ti ch cc phn vic hon thnh

Kim tra s hon cng ca phn vic hon thnh

Kim tra cc ti liu th nghim, o c, cc vn bn khc lp trong quy trnh thi cng.

IV/ Cng tc hon cng theo ngh nh 209 ca chnh ph:

Mt trong nhng cng tc quan trng nhm nh gi cht lng, hiu qu ca quy trnh thi cng ng thi gip n v thi cng, Ch u t cng nh n v Thit k, T vn gim st, qun l cng trnh trong v sau khi xy dng l cng tc hon cng. Cng tc hon cng bao gm:

Cc bn v hon cng: ton b cc cng tc thi cng u c th hin trn cc bn v hon cng.

H s hon cng: bao gm cc bn thuyt minh k thut, chng ch th nghim, h s vt liu, h s cc vn bn php l, vn bn kim nh khc.

IV.1. Yu cu ca bn v v h s hon cng: m bo y

m bo chnh xc theo cc hin trng thi cng ti cng trng

m bo kp thi v p ng c cc yu cu ca ch u t

IV.2. Trnh t thc hin cc cng tc hon cng nh sau:

Trong quy trnh thi cng chng ti s lu gi ton b cc vn bn lin quan nh bin bn pht sinh, cng vn, giy t yu cu ca Ch u t, T vn.

Sau khi thi cng xong mt hng mc hoc mt cng vic, k thut thi cng l ngi c trch nhim hon thnh bn v hon cng ca hng mc hoc cng vic . Vic thc hin cng tc hon cng c thc hin lin tc, xuyn sut trong qu trnh thi cng.

Sau khi hon thnh ton b cng trnh Ban iu hnh, cc phng ban chc nng ca n b thi cng tp hp ton b h s, b sung (nu c) np cho Ch u t, T vn cng vi h s thanh quyt ton cng trnh.

Phn 5 : bin php an ton lao ng v v sinh mI trng

I/. bin php an ton lao ng

Trc v trong khi thi cng thng xuyn t chc cho cn b v cng nhn hc tp v quy trnh quy phm an ton lao ng. V cc quy trnh, quy phm an ton cho tng loi cng vic c th.Cng nhn trc tip thi cng v cng nhn phc v c trang b y cc dng c bo h lao ng: Khu trang, gng tay, ng, knh bo h, m.. . v c ch bi dng c hi tng ng.

m bo tuyt i an ton ti v tr khai thc t, phi b tr ngi hng dn giao thng ti v tr xe ra vo m t v ti v tr ly t.

II/. Phng chy, cha chy

Mi ngi trn cng trng c hun luyn thc hnh phng ho hon, ng thi nm vng nhng thao tc cn thit khi m chy pht sinh (Bit cch bo ng ct ngay cu dao in, bit ni trang thit b cha chy, bit cch s dng trang thit b cha chy, bit cch chn ng loi bnh cu ho cho tng kiu m chy...).

Khng c ht thuc, t la hay hn gn khu vc cm la, khu vc c xng du, thit b, my mc, xng gia cng cp pha...

Phi chun b cc dng c, phng tin chng chy nh b ct, b nc, bm nc, vi bm nc, bnh kh CO2... kp thi cha chy khi c ho hon xy ra .

Phi thit k thit b t ng ngt in cu dao tng li in nhm ngt in kp thi khi c s c.

Bin php hn ch m chy lan rng: Trc khi tin hnh xy dng cng trnh lin lc v t quan h ngay vi trm PCCC gn nht.

Khi c m chy cn hn ch khng cho lan rng, t chc cha chy kp thi.

Trn cng trng b tr cc h thng cu ho tm thi nh bnh bt ho hc, bnh bt ho khng kh, bnh cha chy bng kh CO2

C bng quy nh v phng v cha chy ti cng trnh.

Cc thit b phng chy cha chy (bnh bt, thang, b nc) thng xuyn c kim tra.

Lc lng phng chy cha chy c thnh lp v m bo khc phc kp thi khi s c xy ra

III/. Bin php thi cng trong ma bo:

Vn quan trng l m bo tin thi cng v an ton lao ng trong qu trnh t chc thi cng. Chng ti a ra cc gii php sau:

Tng cng d tr v bo qun vt t, chng ma dt, m t dn n gim cht lng vt liu ti cc kho bi. C bin php cung ng v d tr thch hp cho tng a im thi cng.

Trong giai on thi cng mng, chng ti d phng mt my bm cng sut ln 15(m3/h) m bo h mng lun kh ro trong ma ma bo.

Khi tin hnh o mng, b tr h thng knh dn nc vi dc v b rng hp l m bo nc lun tp trung v h thu nc.

chng trn, trt mt ng phi lm tt bin php thot nc, chng ngp ng trn cng trng, lm cho h thng thot nc lun lun thng thot v cc phng tin vn ti di chuyn d dng.

H thng dy dn in phc v sn xut c bc trong v bc cch in, cc im ni c cch in tt, dy khng t trong nc, c t trn cao nu c th v c bin bo an ton.

Iv/.an ton trong cng tc t:

- Cc h o su phi c hng ro, bin bo v ban m phi c n bo hiu.

- t c tn dng li lp h mng khng c ngay trn ming h o, phi cch xa mp h t nht l 0,5m. ng t ln b phi c dc khng qu 45 so vi phng nm ngang. Khng lu gi hay vn chuyn vt liu v thit b trn ming h o.

- Khi mi ngi lm vic di h phi sp xp b tr ngi v cng vic hp l trnh vic ngi ny lm nh hng n ngi khc gy mt an ton.

- Cng nhn khng c ngi ngh di h o trnh hin tng st l bt ng.

- Phi lm ng ln xung bng thang chc chn.

- My o ang mang ti hay gu y khng c di chuyn.

- Tuyt i khng ng trong phm vi tm quay ca tay cn my o.

- Khng c nhy khi xung, khng c u ngi ln vch h.

- i li qua h phi bc cu i li c lan can an ton bo v.

- Khng c cm v li cc vt nhn, cng di h o nh x beng, que st...

- Khi o t phi c 1 ngi ch dn my o.

V/. an ton trong cng tc xy, trt

- Phi s dng thng cha c mt kn vch kn vn chuyn gch ln cao khng gy ra ri, v ...

- Cng nhn khng c php ngi di tng ang xy .

- Khng i li trn mt tng, da thang vo tng mi xy ln xung.

- Khng c t dng c xy hay cc th tha khc ln tng ang xy .

- Khi tri ma tng ang xy cn phi che y khng cho va b tri gy tng.

- Khi lm vic trn cao cng nhn bt buc phi eo dy an ton v c mc vo v tr chc chn.

- Khi xy nu c ma to, ging hoc gi cp 6 tr ln phi che y, chng khi xy cn thn khng b xi l hoc sp .

VI/. An ton trong cng tc thi cng lp dng v tho d vn khun:

- Khi ca x g bng my ca cn phi tun th theo ng ni quy s dng my.

- Lin kt cc tm vn khun phi chc chn. c bit cng nhn phi eo dy an ton khi lm vic trn cao.

- Cc loi dn gio v cy chng phi vng vng, neo ging chc chn, khng xiu vo. Khng c s dng gio hoen g, cy chng, x g mc nt.

- Ti chn ca gio hay cy chng nu di t c m cht v lt cc bn rng. Khng dng cc vt liu d v nh gch hoc vn chn dn gio.

- Ch c tho d cp pha khi b tng ca kt cu t cng cho php v c php ca cn b ph trch. Khi tho d s thc hin theo trnh t t trn xung, tho dn tng b phn.

- Khi d gin gio phi d theo trnh t khng ko cho , sp tng mng ln.

Vii/. An ton lao ng trong cng tc ct thp:

- Khi nn thng thp bng dng c th cng, phng vy g st bn vo mt v lm xy xc tay, khi lm vic cng nhn phi eo knh, gng tay bo h lao ng.

- Cng nhn khng c ng gn thp ang ko

- Cm dng my truyn ng ct cc on thp ngn hn 80cm nu khng c thit b m bo an ton.

- Ch c dch chuyn v tr ct thp un trn bn my khi a quay ngng hot ng.

- Khi ct thp bng my th ch ngi c chuyn mn mi c s dng my v phi tun theo ni quy s dng my.

- Ct thp gia cng xong c xp gn gng vo ni quy nh, khng ln my, li i li.

- Khi vn chuyn thp ln cao phi buc b thp chc chn trnh ri rt.

- Khng cht ct thp ln sn cng tc hay cp pha qu ti trng cho php.

- Khi hn ct thp phi kim tra k ng dy dn in, ng thi my pht hn c che y m bo an ton v c bin bo nguy him.

Viii/. An ton lao ng trong cng tc m v b tng:

- Ch cho php cng nhn c qua o to v chuyn mn mi c php vn hnh v s dng my trn.

- Trc khi tin hnh b tng phi kim tra k lng h thng vn khun, gio, ct thp, sn cng tc, ...

- Khi b tng nu di chuyn m ti v tr khc cn ngt in xong mi c di chuyn.khi b tng trn cao bt buc phi eo dy an ton.

-Phi kim tra sc kho nh k cho cng nhn, cn b c bit l nhng ngi lm vic trn cao kp thi loi nhng ngi khng sc kho khng cho tip tc lm vic na.

- Cng nhn lm vic trn cao phi eo dy an ton v khng c ung ru bia trong gi lm vic.

- Phi lm hng ro ngn cch khu vc ang thi cng. C bin bo bo hiu, khng cho mi ngi i li, ng di khu vc ang thi cng.

- Dng m rung m va phi ni t v m rung, dng dy bc cch in ni t bng phn phi in n ng c in ca m, lm sch m rung, lau kh v cun dy dn khi ngng vic, cng nhn vn hnh my phi c trang b ng cao su cch in.

Ix/. Bin php an ton khi hn in, hn ct hi:

- Bnh kh xy, acetylen c thng ng trong khi lm vic, cng nh khi vn chuyn, khng gn nhng vt liu d chy.

- Cc my hn c u ni dy v phi c che bc cn thn. Khi hn phi c bin hiu v c che chn.

- Th hn c trang b thit b an ton : nh mt n, gng tay...

- Ch c hn trn cao khi c bin php chng chy v bin php an ton cho ngi i li pha di..

X/. bin php an ton in:

- Cng nhn in cng nh cng nhn vn hnh cc thit b in phi c hc tp, kim tra v cp giy chng nhn t yu cu v k thut an ton in.

- Cng nhn in lm vic khu vc no trn cng trng, phi nm vng s cung cp in khu vc .

- S dng in trn cng trng c s mng in, c cu dao chung v cc cu dao phn on c th ct in ton b hay tng khu vc cng trnh khi cn thit.

- in ng lc v in chiu sng phi lm hai h thng ring. Lp t h thng cu dao chng git.

- Cc u dy dn, cp h phi c cch in, bc kn, hoc treo cao. Cc dy dn phc v thi cng tng khu vc cng trnh c dy bc cch in. Cc dy phi mc trn ct hoc gi chc chn v cao t nht l 2,5m i vi mt bng thi cng v 5,0m i vi ni c xe c qua li. Cc dy dn in c cao di 2,5m k t mt nn hoc mt sn thao tc phi dng dy cp bc cao su cch in.

- Cc cu dao cp in cho tng thit b hoc tng nhm thit b c kho chc chn.

- Cc thit b ng ct in, cu dao .. phi c t trong hp kn, t ni kh ro, an ton v thun tin cho thao tc v x l s c. Trng hp mt in phi ngt cu dao phng nguy him khi c in tr li.

XI/. An ton trong s dng xe my:

- Tt c cc xe my u phi c ng kim, c h s y

- Xe c kim tra bo dng, sa cha nh k

- Trc khi a xe ra cng trng thi cng phi c kim tra

- Cng trng phi c ni quy an ton xe

- Cng nhn thng thng khng c s dng xe, ch c th li iu kin mi c php iu khin xe.

- Cui ngy th li a xe vo ln ti im tp kt xe ca cng trng.

XII/. An ton trong lp rp thit b cng ngh v ng ng:

- C trang thit b ba h y

- Khng cu thit b, ng ng qua u cng nhn

- Mi cng lp u c dy dn hng

- Cp treo buc, mi ni phi c k s gim st thi cng kim tra th mi c cu lp.

- Khi cu lp phi a tay cu t t khng c gia tng tc t ngt.

XIII/. Cng tc v sinh mi trng:

- Cng ty b tr cc thit b hin i, gn nh thi cng nhm hn ch ti a vic nhim mi trng.

- Khi thi cng cc cng tc gy nhiu bi (thi cng nn, dm...) cng ty b tr bm phun nc chng bi ti khu vc thi cng.

- t vn chuyn vt liu phi c ph kn bt hn ch ti a vt liu v ph thi ri vi ra ng.

- Cc thit b thi cng sau khi lm vic xong phi v sinh, tp kt ng v tr quy nh.

- Tt c cc vt liu tha phi c ng ni quy nh trong h s thit k v k s t vn ch nh.

- Ti khu vc thi cng c b tr y cc b ro chn cho thi cng nn c sn trng . Kt hp vi bin bo hiu, bin gim tc , n hiu, c, ci v ro chn cho hai u cc on thi cng cng.

- Phi hp cht ch vi chnh quyn a phng trong sut qu trnh thi cng m bo mt ng, l ng trng thi lu thng, thng sut ca giao thng,

- Trn mi on cng trng, ni ng hin ti s thi cng, nh thu s chun b mt chng trnh qun l giao thng c d kin phng php lin lc trn hin trng, m bo thng tin thng xuyn gia cng trng vi cc m vt liu cng nh c quan a phng trn tuyn.

Vn v sinh mi trng ca cng trng:

Cng tc V sinh

Nh thu s bo m hin trng v cc khu vc thi cng trong iu kin v sinh. Tt c cc vn v sc kho v v sinh s tng ng vi cc quy nh ca B y t, c quan y t a phng v cc c quan hu quan khc.

X l nc thi v cht thi nhim mi trng:

Nh thu s ra cc quy nh cho cng trng v phng n x l nc thi t cc lu tri, vn phng v hin trng thi cng v tt c cc loi nc thi, cng nh tt c cc loi cht lng, cht thi rn sinh ra.

Nh thu s thc hin cc bin php hp l gim thiu v cc cht bn, nhim ngun nc v khng thch hp hoc c nh hng xu n cng ng khi thc hin cc cng vic

Nh thu sp xp v m bo cung cp xng, du diezen, du ng c, cc loi bi trn v cc sn phm xng du khc vo bt k lc no nhm p ng cc yu cu ca mnh i vi mc ch hoc lin quan n hp ng

XIV. cng tc m bo giao thng:

n v thi cng s s dng cc thit b hin i, gn nh thi cng dt im tng on hn ch ti a vic ch tc giao thng.

B tr ro chn di ng, bin hn ch tc c sn phn quang. Ngi eo bng mc o bo h phn quang cm c, ci hiu 2 u ng iu tit xe c v ngi qua li, ban m c n hiu.

Phi hp vi lc lng thanh tra giao thng, cng an giao thng v chnh quyn a phng lm tt vic m bo giao thng, trt t cng cng v v sinh mi trng.

XV/. An ton lao ng khi p cc BTCT

Khi thi cng cc phi thc hin mi quy nh v an ton lao ng v m bo v sinh mi trng theo ng cc quy nh hin hnh.

XVI/. An ton lao ng trong cng tc cu lp cc cu kin c sn:

Bi bc xp cc cu kin c sn cn lm bng phng v c quy nh tuyn ng cho ngi v phng tin bc xp i li thun tin bo m an ton.

Phi c h thng thot nc tt.

Khi bc xp cc cu kin c sn, cng nhn iu khin khng c ng pha di m phi ng sang hai bn.

Trc khi cu cc cu kin c sn, li xe v cng nhn iu khin phi tin hnh kim tra dy cp, mc cu c m bo an ton mi tin hnh cng vic.

Cng nhn iu khin tuyt i khng c ng trong tm vi ca cn trc.

Trong phm vi cng trng xe chy vi tc khng ln hn 10 km/h v qua cc qung ngt hoc vng tc khng ln hn 5 km/h.

XVII/. Bin php an ton y t:

- Cng nhn lm vic phi c nh k kim tra sc kho hng thng. Ai sc kho mi c tham gia vo thi cng.

- Cc t cng tc lun c cc dng c s cu mang theo bao gm: bng ca, gc, bng bng ... v mt s th thit yu s cu ban u.

- B tr 24h/24h mt b phn bao gm: xe, in thoi di ng, y t, bc s trc thuc Ban iu hnh cng trng. S in thoi ny c ph bin n tng t i sn xut duy tr cp cu bt k c th xy ra.

- Cng nhn lm vic khu vc nc thi (kh mtal nhiu) s c trang b cc dng c bo h cn thit nh: gng cao su, ng, mt n phng c ... v c st trng sch s sau mi ca lm vic.

Kin ngh v Kt lun

Trn y l xut nh thu v bin php thi cng v mt s xut kin ngh i vi on C-D thuc d n Nng cp c s h tng cp 1, 2 Tiu d n thnh ph Hi Phng (xy dng ng giao thng, h thng in chiu sng, thot nc, cp nc, trm thu gom rc thi, trm bm, cu Tri L, bi xe t).

Trong qu trnh thi cng, cn c tnh hnh c th v yu cu thc t, chng ti s c b sung, chnh l ph hp hn nhm m bo cng trnh t yu cu k thut thi cng tt, cht lng cao, ng tiu chun Nh nc v php lut hin hnh, an ton trong thi cng. Knh ngh Ch u t, T vn gim st quan tm xem xt v c kin ch o cho nh thu thi cng.

Xin chn thnh cm n!

T vn gs, K thut thi cng kim tra xc nhn

T vn gs, Ch u t duyt

S dng, lp t vo ct

bo qun,

Lu kho

Mua, vn chuyn

Kho st h s, ly mu

PAGE Page 38


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