BPTC Sua Chua Chong an Mon Cau Cang2

7/24/2019 BPTC Sua Chua Chong an Mon Cau Cang2

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QUOC THANG CO. LTD.

TRADING & CONSTRUCTION

HA CHT XY DNG XL CHNG THM, SA CHA CNG TRNHTrs: 257 in bin ph- TP NngTel: 0511. 3725881- Fax: 0511. 3725882. Email: [email protected]

Bn vng&Thn thin THNG HIU CHNG THM HNG U VIT NAM

www.quocthangco.com.vn

Trang 1

BIN PHP THI CNG PHC HI BO VCHNG N MN CU CNG C

ng ln u ti bachkhoadanang.net

I- T VN : t nc ta c trn 3200 km bbin, vi hng chc ngn cc cng trnh ven bin,iu ny i hi nhng bin php bo vb tng ven bin trc sn mn, xm thc ngy cng trnncp thit, khng chi vi nhng cng trnh mi, nhng cng trnh cxung cp nhanh, do cng trnh khng c quan tm ng mc cho vic bo vchng n mn cng phi c sa cha, duy tu, tngcng cc bin php bo v, bi nu khng chng ta sphi ng trc vic tn tht rt ln do hng lotcc cng trnh xung cp nghim trng trong mt thi gian ngn.

Song c mt thc tti nc ta l cc bi vit hn lm vchng n mn b tng, phc hi cucng th rt nhiu, chcn ngi vo mng search th ra hng t, trong khi nhng bi vit tthc tthrt him, i khi cn mc hi ht.. vy chng ti cng xin gp thm mt vti ny.

Trong khun khca bi thuyt minh bin php thi cng phc hi kt cu, bo vcu cng qua sdng, chng ti chxin cp khi qut nguyn nhn cbn ca vic n mn vi cng trnh cu cng, vbin php thi cng ca chng ti da trn cstthc tm n vchng ti thi cng, tng hp ccbc cbn, trnh by khi qut trong bi vit ny, tuy khng thchi tit tng cng on ca quytrnh, nhng chc chn smang c n nhng ai quan tm thm nhng thng tin, t c cch chncng nghph hp vi iu kin ca mnh, trn tinh thn chia sthc thchng ti xin trnh by nhsau:

1.1Khi qut nhng nguyn nhn lm hhi b tng.

Chng ta quan st hnh bn cnh, c chp bngphng php ct lp t bo mao dn trong b tng,phng to 4000 ln. y l l thuyt cn nguyn ca

chuyn nghnh chng thm, bo vb tng, bi ngin l bc nh cho chng ta nhn thc mt cchtrc quan vvic chng thm ci g, bo vci g, nl gii mt cch thuyt phc cho cu hi v sao!? Bcnh chng minh trong b tng c khng kh trongcc mao dn, v cc ti kh ny cng chu tc ngtrc tip tmi trng bn ngoi, thng qua cc maodn, cng theo thi gian, v tin trnh lo ha ca btng, cc mao dn ny s l tin cho cc loi khn mn, xm nhp vo trong b tng n mn thp giac, v snh hng tmi trng cng nhng nhc

im trong xy dng l nguyn nhn chnh lm hhi b tng ta xem nhng khi qut cbn nhsau:

- BCarbonat (carbon ha) do CO2.- Do c mui ngng t.- Do lp phbc st thp khng kn.- Do cht lng b tng km.

Mc hhi bchi phi bi nhng nguyn nhn trn v tin trnh xung cp ca b tng.

Carbon ha - mt yu tthen cht.Sthm nhp mt cch tnhin ca Carbon Dioxide lm bin i Canxy-hydroxyt c sn trong b tngthnh canxi-carbonate, do vy lm gim kim cao v cc c tnh chng n mn.

Nu lp phst thp mng v cht lng b tng km, hin tng carbon ha sl nguyn nhn lm stthp bn mn v Oxy v Nc kt hp vi nhau sto ra gst lm nt gy.

Sa cha v bo vb tng mt cch c hthng.


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Trang 2

Chbng phng php hthng mi mang li kt qulu bn trong vic bo vhoc sa cha b tng.im quan trng l chhthng sn phm c cht lng cao, qua thnghim vi nhng thnh tcn bng.

Hiu ng ha hc.- pH 100

Amoni NH4+(mg/l) 15 - 30 30 - 60 60 - 100 25 - 65

Magi Mg2+(mg/l) 300 - 1000 1000 - 3000 > 3000 220 - 450

Sulphate SO42-(mg/l) 200 - 600 600 - 3000 3000 - 6000 250 - 1250

c tnh v chc nng.

nh test n mn b tng:

Mu (bn tri) b tng bsulphate n mn

Mu (bn phi) b tng bacid n mn

-

Xi mng c hm lng C3A thp: tng tnhchu sulphate.

-

Xi mng k thut l cao: Tng tnh chu vchng sphn hy n mn v sulphate.

- Phgia polymer:tng bn ha hc.

-

Khi lng l t: gim s lu thng bng maodn.

-

Tlw/c thp:bn cao.Nhng nguyn nhn vt l lm gim cht lng btng:


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Trang 3

Qu trnh carbon ha:

B tng trn tip xc vi CO2sbcarbon ha.

Qu trnh ny lm gim pH c trong nc mao mch ca hn hp xi mng tkhong 13 xung cnkhong 9. iu ny lm gim tnh bo vv sxy ha chng g, dn n st thp bn mn. Sn mnttsto iu kin cho xy v hi m chim ch, n mt mc nht nh th sn mn st thp sl nguyn nhn lm hhi bmt. (trch dn tliu nc ngoi )

Nhng hin tng n mn trn thc tti mt scu cng c

Sau khi c kho st chi tit ti cu cng, chng ti nhn thy cht lng b tng cu cngxung cp nhanh a sl do vic duy tu bo dng nh kkhng c quan tm ng mc, thi gianlm vic lu nm ca cng trong mi trng n mn lun i hi chng ta c cc bin php bo vmtcch hthng, nhm nng cao hiu qukhai thc, c cscho nhng gii php ca mnh, chng tixin khi qut mt snguyn nhn cbn nhsau:

Ta xem 2 nh thc t ti mt cu cng, chng ta c ththy c hin tng n mn hin din tuymi l giai on u, bi giai on ny mi chbt u bng cc vt nt dc theo mp ngoi ca thp aisn b tng cu cng, cc vt nt ny khng nh hng n kt cu nhng li l hin tng mu cavic n mn rt mnh b tng trong tng lai gn. Ta xem qua hnh nh mt cu cng khc tng tdi y, thy r hn vnhng hin tng ban u nu nhkhng c gii php bo vkp thi sdnn nhng khng chgy tn km ln m cn thm phn kh khn cho vic sa cha trong tng lai.

Chng cng xem qua biu n mn bn di chng minh rt r vvic n mn hng mc ny


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Trang 4

Chng ta cng c ththy r trn biu vng 1 bn mn mnh nht.

i vi phn gm ca cu cng ta cng c thxem xt tng tqua nhng bc nh thc tti mt cucng sau:

Xem qua 2 nh thc tnu trn cho thy cng xut hin mt vi vtr cc b bn mn, ta xemthm hnh vminh ha hi nc tn cng mt gm cu cng sau:


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Trang 5

Trong khi va phi chu trc tip ti trng, mi trng, thi tit bn trn, b tng gm cu cn phi chung thm cc loi hot cht n mn chi phi sut trong thi gian tn ti ca cng.

Cn y l nhng bc nh nhng cu cng bn mn.

Qua 2 bc nh tham kho trn, ta c thnhn thy sn mn pha trn mc nc mnh hn rt nhiu phn sng tp.

Qua nhng chng csbnu trn, chng ta c ci nhn cthhn tthc t, iu cho chng ta thycn phi c bin php bo vb tng mt cch ng b, tng thhn cho cu cng.

II- THUYT MINH BIN PHP THI CNG:

Cn cthc tsau cuc kho st thc tti cu cng

Xt tnh ph hp ca cc gii php cng nghhin nay Vit Nam, v trn thgii

n vQuocThang Co xut phng n thi cng, gii php p dng vt liu, cng nghthi cng phchi kt cu, bo vb tng cu cng cnhsau:

2.1 La chn phng n chun bcho vic thi cng:

PHNG N 1 : Lp t dn gio thi cng


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Sau khi xem xt thc t, chng ti cho rng: vic dng dn gio skhng my ph hp bi nhngyu tcthnhsau:

Do kt cu cu cng thng c su ln, nn y ca cng gm ct lm chm

Mc nc thy triu ln xung slm mt rt nhiu thi gian cho vic lp t.

Rt tn km chi ph do phi dng rt nhiu dn gio, c ni khng thlp c

Vi nhng yu tbt li nu trn, chng ti loi bphng n ny.

PHNG N 2 : lp t sn cng tc

Bin php ny cng khng khthi bi mt vi yu tcbn nhsau:

Khng thkhoan bt vt vo b tng trong iu kin bng bnh trn mt nc, v khng c csm bo mi khoan chnh xc khng lm t kt cu thp bn trong.

Cng khng thdng hn in neo cc thanh ca dn khng gian vo kt cu tr, c bit l cctrc ng thp bn ngoi.

Chai cch neo sn cng tc u khng c csp dng c bi, khng thbo vb tng chny li gy thm iu kin cho n mn chkhc, c bit l cc trc ng thp bn ngoi, nhng vtrhn slm hng lp ng thp bo vtr.

PHNG N 3 : lp b phao

Phng n ny tra hp l bi nhng yu tcbn nhsau:

Ch ph lp t, chto khng cao, vi vic tn dng cc thng can.. phuy nha, c kt thnh bphao bng khung st, thi cng da theo lch thy triu.

B ny c buc dy iu khin, cc loi my thi cng, vt liu..v/v, c t trn mt cu cng,cc loi thit bthi cng ca n Vchng ti u khnng tc nghip ton bdin tch bn di gmcu. Thi cng da theo lch thy triu.

y l phng n c chn ca chng ti, bi phng n ny loi bhon ton nhng yuim bt li ca 2 phng n trc, v l phng n cc nc pht trin cng ang dng. Ta xem quahnh nh sau:

3. Cng nghvt liu p dng:Trn thgii hin nay vic p dng bo vcho mt gm cu cng c tng i nhiu, nhng

y chng ti xin trnh by 3 loi vt liu, cng nghcbn cho hng mc ny nhsau:


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3.1. Cng nghphun lp phpolyurea:

nh: Phun lp phPolyurea nh: Dn thp ln bmt b tng bng polyurea

Cng nghny c xem l cng nghthk21, chng c dnh bm rt cao, trn nhiu loi bmtca nhiu loi cht liu khc nhau, c bit l siu bn. Song cho n nay cha c mt bi vit no trnthgii cng nhVit Nam, nh gi c hiu quvvic p dng cng nghny cho gm cu cng.

n vQuocThangCo sau mt qu trnh thc nghim, nghin cu, ng dng cng nghny, chngti thy rng cng nghny c nhng hn chc th khi dng cho mi trng ny, cthnhsau:

1. Vt liu ny khng m bo kt dnh khi phun ln bmt c m cao. (hi m cncha trong cc mao dn nm gn bmt b tng).Nhvy, khi mun p dng lp phny cn

phi c nhng thit bchuyn dng o m bmt, kim tra xem c t kh yu cu trc

khi phun hay khng, .v/v rt nhiu chi tit lin quan cn phi xl vi bmt cn c xem xtmt cch thn trng. Nu khng chmt thi gian ngn sau khi thi cng, lp phny sbbongdo hi m bn trong, lc lp mng ny chnhchic o ma khoc ngoi cu trc.

2. Khng dng c cho bmt b tng c hin tng vi ha do vt liu c cng dnh bmrt cao, nn khi bmt b tng bvi ha th lp polyurea ny sbm vo lp bt bmt v s

bung ra trong thi gian vi thng sau . Trong khi thc tti cu cng cth bmt u chin tng ny.

3. Mt khc, ngay ckhi phun ln bmt thp, hoc b tng chun, nu khng c bin php xl bmt ph hp mt cch chuyn nghip, lp phpolyurea ny sbhin tng bt kh nh hngrt ln n cht lng ca lp bo vny

nh minh ha hin tng lp phbbt kh


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Trong khi kho st thc tti mt scng trnh cu cng trn t nc ta, chng ti nhn thy hu htu c hin tng n mn, khi ly ngn tay ch nhvo bmt u thy hin tng ri bt bmt.

V vy vic p dng cng nghny trong thi im hin c tnh ri ro rt cao. Trn l thuytchng cn c 1 hoc 2 loi Primer xl m trong bmt b tng, bi chng khng chp ng cvic xl cc loi bmt b tng ang bcabonat ha, m cn m bo ngn hi m ca b tng nn mtcch hiu qu. iu c ngha l: Nu p dng cng nghny, n vthi cng phi tht slm chc cng nghmt cch chuyn nghip tcng on vsinh bmt.cho n xl m, hon thinv/v. Song cho n nay, nc ta snh thu thc sc nng lc, trnh thc slm chcngnghkhng c nhiu. Thi gian gn y c mt sn vng dng cng nghny bo vb tng cucng, hquay video tung ln mnglng x..v/v. Song cng xin thng thn ni rng: a svn ang ngdng ng cp skhai, rt hi ht trong cch t vn vkthut, cng ngh.V thc t, cng nghny p dng khng thnh cng mt p thy in ln ti Vit Nam. Cn cc hng mc b tng trnkhc cng nghny c thnh cng vang di.

Xut pht tnhng l do nu trn, n Vchng ti khng la chn cng nghny cho hng mcbo vb tng gm cu cng.

3.2. Cng nghdng epoxy: y l cng nghc xem l phthng ti Vit Nam, ta xem quaquy trnh cng nghca loi vt liu ny c csxem xt nh gi n khnng ph hp i vi yu

cu cthca cng hay khng cthnhsau:

- Cng nghny i vi cc cu cng cn, thi cng trndn gio, hoc sng cng tc th khng vn g. Songcng nghny c nhng mt hn ch, m vi sphttrin ca thi i ngy nay kh chp nhn c viyu tnh:

1. Thi cng bng phng php thcng, lmchm tin , vi 3 lp vt liu.

2. Khng c khnng chu m tb tng nn (hi m pha lng ca lp vt liu ny), chcn hi mtvt liu nn slm bung tng mng vt liu ny.

3. Tnh c hi ca vt liu ny khng ph hpvi xu thpht trin bn vng ca cc ngnh khoa hc

hin nay trn thgii. Ta xem qua bng so snh cng nghepoxy v cc loi vt liu thn thin khc gcxi mng /polymer.


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Bng so snh vt liu gc xi mng v expoxy.

Gc xi mng/polymer Epoxy

c tnh

- Tnh khng nc mm bhn ch.

- Khnng chu mi mn cao.

- Cho php hi m thot m tnhin.

- Tng thch tuyt i vi b tnggc, tn ti tng tc trong b tng

-Tnh khng nc mm bhn ch.

- Khnng chu mi mn rt cao.

- Khng cho php hi m thot qua.

- Khng tng thch vi b tng gc,tn ti cng chbmt b tng

Cchdng

- Dng cho b tng m.

- Ddng sa cha / b tng tng

thch.

- Bmt tng i phi kh.

- Yu cu nhng iu kin c bit

cho vic sa cha.

Sc khe

- Khng c hi, khng gy dng.

- Khng yu cu iu kin c bitkhi sdng

- C tnh c hi, gy dng i vimi trng, cn c nhng bin php

bo vkhi sdng.

- L cht thi nguy him.

Cn cvo nhng yu tnh nu trn, chng ti khng la chn cng nghny, bi khngph hp cho vic p dng bo vb tng gm cho cu cng.

3.3 Cng nghbn vng, p dng vt liu gc xi mng/polymer: y l phng n xut

ca n Vchng ti.Cng nghny c pht trin tnhng vt liu tng thch vi b tng gc, chng c u im

tuyt i l cng tn ti vi b tng nn chng c bn vnh cu, y cng l khi nim cbn cacng nghcn bng tnhin, thn thin vi mi trng, n c xem l phng chm ct li trong cngnghxl bn vng cng trnh. Chng ta cng xem qua hnh vminh ha bin php thi cng ca cngnghny:


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3.3.1 c tnh cbn, cchhot ng ca vt liu GS 200.

Chng ta cng xem nhng bc nh chp ct lp cchthm thu ca vt liu c tn l Greenseal200, bc nh ny c ng k v ng du bo chng ca cquan qun l cht lng quc t. n sgip chng ta chn la c mt phng n tt nht cho yu cu tthc tnu ra cho chng ta.

1. nh mao dn cha p dng vt liu 2. nh 7 ngy sau khi p dng vt liu 3. nh 24 ngy sau khi p dng vt liu

Nhng hnh nh trn chng minh cho chng ta mt ci nhn trc quan, sinh ng vsthm thu cavt liu Greenseal GS 200 vo cc mao dn ca b tng, khnng ny ca vt liu khng chcc maodn, ngn nga cc loi kh, n mn, hi nc xm nhp vo b tng, c bit cchthm thu nykhng nhng ngn chn hi m tb di ln m cn loi bhi m tbn trn xung. Chng ta c ththy vtr p dng vt liu ny trong kt cu b tng cu cng, n khng n thun chn lp cc mao dntrong b tng m cn bo vtrc tip bmt b tng gm, lm nn tng tt cho lp vt liu GS Polydeksau bm cht vo bmt tn ti tng tc, cng bo vb tng cu cng. Mi thng tin kthut chi titca vt liu xin xem thm mc : Thng tin kthut vt liu GS 200 dnh km theo hsny.

3.3.2 c tnh cbn, cchhot ng ca vt liu Polydek.

Polydek l lp mng chng thm a nng dng lng to mng Polymer, c khnng dnh bm vn hi rt cao, trn mi loi bmt, vt liu ny chuyn dng cho cc vng ven bin bi khnng chumn trc tip, chu sng mui, vt liu ny c khnng chu ng mi thi thit khc nhit , khng chl nhng ni m thp m ngay ctrong mi trng bc x, tia cc timv/v. vi tnh nng ni tri nutrn, vt liu ny c chng ti p dng kt hp cho vic bo vb tng cu cng PVGAS. Mi thngtin kthut chi tit ca vt liu xin xem thm mc : Thng tin kthut vt liu Polydek dnh km theohsny.

3.4 THUYT MINH QUY TRNH THI CNG

Quy trnh thi cng ca n vQuoc Thang Co theo tng bc nhsau:

1.

Vsinh bmt

Dng my phun nc p lc cao kt hp vi ct, bn sch bmt gm, phng n ny sloi bhon ton lp mt bcacbonat ha, c xem l ra mn cho bmt trc khi p dng vt liu,v vy phi dng nc sch phun bn, ta xem hnh nh


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Trang 11

2. Phc hi - Chnh sa bmt. kt cu b tng cu cng

3.

y l cng on c bit quan trng trong quytrnh sa cha,phc hi cng nh bo vb tngven bin, bi nu cng on ny khng c x ltt th vic th lp bo vbc ngoi cu trc s trln v ngha. Hin nay, vic sa cha phc hi btng cng c kh nhiu cng ngh. Song trn c s

hng n s bn vng cho cng trnh, n vQuocThang Co xut p dng bin php xl bnvng. V y cng l phng n ang thnh hnh cc nc pht trin.

Chng ta xem qua mt vi hnh nh ca p dng phng n sa cha bn vng ny ti nc ngoi:

nh sa cha hon ton p dng cc loi vt liu gc xi mng, tng thch tuyt i vi b tng

nh vsinh bmt bng thit bchuyndng, nhm ti u ha khnng dnh

bm, thm thu ca vt liu GS 200.

nh b tng slnhng chkhuyt tt bmt. iu ny gip cho vic chnh sa t

cht lng cao nht.


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Trang 12

V hnh nh tliu QuocThangCo p dng ti vit Nam

1. Vsinh bng thit bchuyn dng 2. Lp vn khun li b tng

3. Gn ng bm va chuyn dng 4. Hon thin a vo sdngChng ta xem qua sha bin php sa cha phc hi p dng cho gm cu cng sau:

Sau khi phun nc ct cao p bng thit bchuyn dng, bmt slra nhng vtr b tng yu,vi nhng vtr ny, phi c sa cha, cc vt rmt sc thc hin theo quy trnh sau:


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Trang 13

Kt ni bng vt liu chuyn dng SBR 701 ha vi xi mng theo tlnht nh. hoc dng ccloi polymer trung tnh kt ni, ty theo thc t, khi lp kt ni ny va se mt, tin hnh trm li

bng hn hp va 3 thnh phn xi mng + ct + Phgia gc xi mng, to ra mt loi va trt c

bit c mc tng ng vi b tng gc, hn hp ny c trn ti cng trnh. i vi cc vtr brng, chng ti gn ng bm va chuyn dng phc hi. Trong trng hp thp gia cchm bnmn, ta vsinh sch qut vt liu bo v.. bin i r, nhng nu bn mn qu 2/3 ng knh, s

phi c mrng thay thon thp v hon thin li.

Cn cvo cc bn Test mu, kt qugim nh cht lng ca cc cquan chc nng, th vicp dng cng nghny ca n vchng ti c kt qu rt tt, thm ch c cng trnh chc ti

phc hi 6-7 nm n nay u khng c hin tng g.

i vi cc vt nt mp ngoi ca cu cng:

Cc dng vt nt nhc chiu rng khong 3 n 4 mm trxung s p dng quy trnh bm keoepoxy bng xy lanh chuyn dng qua cc bc cthnhsau:

Vsinh sch hai bn vt nt khong t3- 4 Cm

Dng keo dn epoxy chuyn dng trm bmt lm km vt nt

Dn nh vcc nt bm bng keo dn chuyn dng

Dng keo bm epoxy c nht thp, keo ny c sc cng bmt thp nn c khnngthm su vo ton b vt nt, c ha trn vi t l chun, sau s dng xy lanhchuyn dng bm lu p khong 4 ting

Hon thin li bmt

Sau y l hnh nh thi cng bm epoxy sa cha kt cu b tng ca n vchng ti:

2.1 nh thi cng theo quy trnh bm epoxy bng xy lanh.

2.2 nh thi cng theo quy trnh bm epoxy bng thit bbm cao p.


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Trang 14

Lu :Vic p dng bm keo epoxy hn gn vt nt chc thdng nhng vt nt nh, ttnht l cc vt nt c3mm trxung, nu p dng cho cc vt nt ln srt dgy ng sut, lmnt chkhc. Cc vt nt ln hn khong t5mm trln, phi p dng bin php xl bn vng,

(nhtrn hnh nh tliu chng ti nu trn) bm va c bit phc hi b tng.3. p dng vt liu:

3.1. Phun vt liu GS 200 Bng thit bchuyn dng

Sau khi bmt b tng c sa cha, ta tinhnh phun lp vt liu GS 200 theo cc bc sau:

Dng my phun nc c p lc trung bnh tim (ra qua bmt b tng)

Ha vt liu GS 200 vi nc sch t l tiuchun

Dng thit bphun va chuyn dng p lc cao,phun ngc ln bmt di ca gm cu cng

Phun mt lp duy nht, vi nh mc t1,3 n1,5 kg/ m2 (phng n ny loi bsphn tng

gia hai lp vt liu do thi gia thi cng trc v t thi cng sau)

y l thit bln u tin ti Vit Nam n vQuoc Thang Co ng dng, thit bc p lc rtcao, t cng lc bn ct liu tiu chun ln bmt b tng, vi p lc u vit ny m bo tolc ht bm dnh bmt ca cc thnh phn ht trong vt liu, nng cao hiu quthm thu cavt liu.

3.2.

Phun vt liu Polydek bng thit bchuyn dng:

Sau khi bmt lp vt liu GS 200 kh hn, khong t1 n 3 ngy ( ty theo thi tit thc t),ta tin hnh thi cng lp hon thin Polydek theo cc

bc nhsau:

Phun ra, ti m b mt bng myphun nc

Ha vt liu Polydek vi nc ( ty theotnh hnh thi tit lc phun )

Khi bmt cn m do phun ra nc, tatin hnh phun ngc ln gm cu cnglp th nht. Khi lp th nht va se

mt, hoc kh hn, ta phun lp th2. nh mc ca c2 lp vt liu ny l 1 lt/ 1,6 n2m2

Vt liu Polydek skh trong khong t4 n 24 ting ( ty theo tnh hnh thi tit ).

Sau thi cng xong lp polydek l lp hon thin cui cng ca quy trnh thi cng m n vchngti trnh by nu trn.

Nng, Thng 11 nm 2010

Ngi vitPhm Quyt Thng

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BPTC Sua Chua Chong an Mon Cau Cang2

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