N KTTC11 CHNG 1 SVTH: NGUYN TH NAMGVHD: ON VNH PHC LP: 07XD1 N K THUT THI CNG Yu cu : Thit k bin php xy lp v t chc thi cng qu trnh thnh phn cng tc san t v btng ct thp ti ch. 1.PHN SAN T -ng ng mc thp nht: 7,4 m - chnh cao ng ng mc: 0,45m - Kch thc t : 300m x 200m - H s mi dc: m=0,67 - H s ti xp ko=0,035 - t cp: II2.PHN B TNG- S khung s 1 -S tng nh : 4 tng -H tng3,3 m -S nhp : 5 -S bc : 26 -L nhp: 5,4m - Bc B : 5m - Chiu dy sn: 10cm - Ct25x35 cm - Dm chnh:20x55 cm - Dm ph:20x35 cm - Phng php b tng: th cng - Vn khun thp PHN ICNG TC SAN LP MT BNG I.1 .Tnh ton san bng khu vc xy dng Tnhsanbngkhuvcxydngtheoyucucnbngphnotvphnp t. Trnh t tin hnh theo cc bc sau: I.1.1.Chia khu vc san bng thnh cc vung ykchthct300x200m.Nntaphnchiathnhnhngvungvicnh 50m.Kng cho chia vung thnh nhng tam gic xui theo ng ng mc. Ti mi nh gc vung ta ghi cao trnh en (cao trnh t nhin) v cao trnh (cao trnh thit k), v vng ranh gii s khng ( ng ranh gii o p). Khu vc xy dng c chia thnh 48 tam gic c cnh gc vung 50 x 50m, c nh du nhhnh v. N KTTC12CHNG 1 SVTH:NGUYN TH NAM GVHD: ON VNH PHC LP: 07XD1 Hnh 1: Bnh khu t I.1.2.Tnh cao trnh en cc nh gc vung : ( cao t nhin ) Cao trnh en ti cc gc vung c tnh ni suy tng ng mc bng cc mt ct qua cc nh vung v vung gc vi hai ng ng mc. Hi = Ha +xLH.A V1ngthngvunggcvic2ngngmcxcnhL,dngthcxc nh khong cch t A n M c x.Bit c cao 2 ng ng mc qua A v B.T suy ra Hi. Kt qu tnh ton ghi trn bnh khu vc san bng. I.1.3.Tnh cao trnh san bng :( Ho)

*Vi n l s tam gic c cnh a x a trong khu vc xy dng.Trong :EH1 ,EH2,.., EH8 : Tng gi tr cao tnhin ca cc nh c 1, 2,..., 8 tam gic hi t. Vi kt qu tnh ton theo hnh v trn, ta c : +1EH1= 22,56m +2EH2=44,08 m N KTTC13CHNG 1 SVTH:NGUYN TH NAM GVHD: ON VNH PHC LP: 07XD1 +3EH3= 552,66 m +6EH6= 1044,7 m +4EH4=5EH5=EH7 =8EH8= 0 H0=11,56mI.1.4.Tnh cao trnh thi cng Htc = Hi - H0 Trong : Hi - L cao t nhin ti im i ( Hen ) H0 - L cao san bng ( H) Kt qu tnh ton cao t nhin, cao thi cng: I.1.5. Tnh khi lng t cc lng tr tam gic Hnh 2: Trng hp h1, h2, h3 cng du. +Cc hon ton o hay p i vi cc tam gic c cnh axa: Vo (p) =) (6.3 2 12h h ha ( 1) Vi h1,h2,h3 : Ly gi tri s Cc c c phn o vp ( cao cc nh khc du ) K hiu nh khc du l h1 Hnh 3: Trng hp h1, h2, h3 khc du. +Th tch khi chp cy A cng du vi h1 VA= ) )( () (63 1 2 1312h h h hh a+ +( 2 ) VA lun cng du vi h1 h 2 h h 1 V chm V Chp a a H o h1 h 2 h 3 a a N KTTC14CHNG 1 SVTH:NGUYN TH NAM GVHD: ON VNH PHC LP: 07XD1 Vi h1 t s ly gi tri s, h1,h2,h3 mu s ly gi tr tuyt i +Phn th tch cn li tri du vi VA c2 nh cn li ca tam gic: Vchm = V - VA ( 3) VA: xc nh theo cng thc ( 2) V : xc nh theo cng thc ( 1) Ta c khi lng t o vp c tnh theo bng: Du (-) phn bit phn t p. Cc s liu tnh ton c ghi trong bng: Bng 1.1: Tnh ton khi lng t cng tc STT cao thi cng ViV Khi lng t cng tc h1h2h3V+V- 1-1.73-2.45-1.06-2183.333 -2183.333 2-1.01-1.73-1.06-1583.333 -1583.333 30.06-1.01-1.06-837.50.0750.075-837.575 4-1.010.340.06-254.167-297.19143.024-297.191 50.340.060.75479.167 479.167 60.751.590.341116.667 1116.667 71.590.751.551620.833 1620.833 81.552.51.592350 2350 92.51.552.592766.667 2766.667 102.593.432.53550 3550 110.342.593.642737.5 2737.5 123.643.943.434587.5 4587.5 13-2.45-2.72-1.7-2862.5 -2862.5 14-2.45-1.06-1.7-2170.833 -2170.833 15-1.06-1.7-0.88-1516.667 -1516.667 160.06-0.88-1.06-783.3330.0850.085-783.418 17-0.880.060.02-333.333-335.6342.301-335.634 180.060.020.75345.833 345.833 190.960.020.75720.833 720.833 200.960.751.551358.333 1358.333 211.910.961.551841.667 1841.667 221.911.552.592520.833 2520.833 232.951.912.593104.167 3104.167 242.953.642.593825 3825 25-2.72-3.5-2.74-3733.333 -3733.333 26-1.7-2.72-2.74-2983.333 -2983.333 27-1.7-2.74-1.87-2629.167 -2629.167 28-0.88-1.7-1.87-1854.167 -1854.167 29-0.88-1.87-0.61-1400 -1400 300.02-0.88-0.61-612.50.0060.006-612.506 31-0.610.020.38-87.5-151.63664.136-151.636 N KTTC15CHNG 1 SVTH:NGUYN TH NAM GVHD: ON VNH PHC LP: 07XD1 STT cao thi cng ViV Khi lng t cng tc h1h2h3V+V- 320.020.380.96566.667 566.667 330.960.381.361125 1125 341.360.961.911762.5 1762.5 351.911.361.912158.333 2158.333 361.912.951.912820.833 2820.833 37-4.5-3.62-3.5-4841.667 -4841.667 38-2.74-3.62-3.5-4108.333 -4108.333 39-2.74-3.62-2.58-3725 -3725 40-2.74-1.87-2.58-2995.833 -2995.833 41-1.87-2.58-1.28-2387.5 -2387.5 42-1.87-0.61-1.28-1566.667 -1566.667 43-0.61-1.28-0.25-891.667 -891.667 440.38-0.61-0.25-20036.65836.658-200 45-0.250.380.31183.333-18.454201.787-18.454 461.360.380.31854.167 854.167 471.360.310.65966.667 966.667 481.361.910.651633.333 1633.333 TNG45160.572-46669.747 I.1.6.Tnh khi lng t mi dc: Dotcmidcnnkhisancnphitinhnhtnhtonttomidcxung quanh vng t san trnh hin tng st l. Hnh 4: Cc trng hp tnh khi lng t mi dc. t mi dc o hoc p c tnh theo cng thc: l h m V . .6121 =I ) .( .412221h h a m V + = VIII=31231h m m: l h s mi dc m = 0,67 h 1 mh 1 l I II III h 2 mh 2 a h 1 mh 1 mh 1 mh 1 h 1 N KTTC16CHNG 1 SVTH:NGUYN TH NAM GVHD: ON VNH PHC LP: 07XD1 Kt qu tnh ton ghi bng di: Bng1.2: Tnh ton khi lng t mi dc STTMI DC H OKHI LNG (M3) OP V10,67x((-1,732)+(-1.01)2)/4-33.609 V20,67x33,4242x(-1,012)/6-3.807 V30,67x16,5758x0,342/60.214V40,67x(0,342)+1,592)/422.141V50,67x(1,592+2,52)/473.517V60,67x(2,52+3,432)/4150.875V70,67x(3,432+3,942)/4228.541V80,67x(3,942+3,642)/4240.976V90,67x(3,642+2,942)/4183.849V100,67x(2,952+1,912)/4103.436V110,67x(1,912+0,652)/434.091V120,67x(0,652+0,312)/44.343V130,67x21,1073x(-0,25)2/60.227 V140,67x28,8927x(-1,28)2/6-0.202 V150,67x((-0,25)2+(-1,282)/4-14.245 V160,67x((-1,28)2+(2,58)2)/4-69.469 V170,67x((-2,58)2+(-3,62)2)/4-165.497 V180,67x((-3,62)2+(-4,5)2)/4-279.343 V190,67x((-4,5)2+(-3,5)2)/4-272.188 V200,67x((-3,5)2+(-2,72)2)/4-164.555 V210,67x((-2,72)2+(-2,45)2)/4-112.233 V220,67x((-2,45)2+(-1,73)2)/4-75.336 V230,672x(-1,73)3/3-0.775 V240,672x3,943)/39.152V250,672x0,653/30.041V260,672x(-0,45)3/3-13.635 TNG 1051.403-1204.894 T ta c: +Tng khi lng t p: Vp = Vp+Vm p = 46669,747 + 1204,894 =47874,641(m3) +Tng khi lng t o: Vo = Vo+Vm o= 45160,572+ 1051,403= 46212,123(m3) -Xt ti xm ca t: t khu vc thi cng lt cp II c h s ti xp cui cng l 0,035 Vo = 46212,123 x(1+0.035) = 47829,394(m3) -Sai s gia khi lng o vp l: N KTTC17CHNG 1 SVTH:NGUYN TH NAM GVHD: ON VNH PHC LP: 07XD1 AV = 47874,641 - 47829,394=45,247(m3) -Sai s l:S =09 , 0394 , 47829247 , 45= =AVV% < 5% Vy tha mn iu kin I.2.Xc nh hng vn chuyn v khong cch vn chuyn trung bnh Dng phng php th xc nh hng vn chuyn v khong cchvn chuyn trung bnh . TbiuCutinpvtheonguyntccngvcttaxcnhckhongcchtrung bnh v hng vn chuyn: 39 , 319242475 , 2901016= = =VWLxxm 34 , 949242425 , 8718837= = =VWLyym 42 , 99 34 , 94 39 , 312 2 2 2= + = + =y x tbL L L m I.3.Chn my thi cng v s di chuyn my-Khu vc san bng lt cp II vng t rng, dc nh,nn c th chn my cp san nn . -Chn my cp DZ-77.-Cc thng s k thut : +Dung tch thng:q =8,8 m3 +Chiu rng li ct:b = 2,58 m + su ct t ln nht:h =0,35 m I.3.1. on ng o ca my cp t ch K Kh bqL . ..== 35 , 0 . 58 , 28 , 0 . 1 . 8 , 8 = 7,8 m Trong :q = 8,8 m3 Kch = 1- H s cha Kt - H s ti xp ca t, vi t cp II, Kt = 0,8 b = 2,58 m h = 0,35 m I.3.2. Nng sut ca my cp : ) / (... . . 36003s mK TK K qQt cktg s=q-Dung tch thng xe Ktg- H s s dng thi gian Tck- Chu k cng tc Khong cch vn chuyn trung bnh : L = 99,42 m- Qung ng o: + l1 = 7,8 m + Cho my chy s 1 vi vn tc v1=4 km/ h = 1,1m/ s - Qung ng vn chuyn v ri t : + l2 = 99,42 7,8= 91,62 m + Cho my chy vi vn tc trung bnh v2 =5,8 km/ h = 1,6 m/s N KTTC18CHNG 1 SVTH:NGUYN TH NAM GVHD: ON VNH PHC LP: 07XD1 - Qung ng quay v: + l3 = 99,42 m + Cho my chy s 4 vi vn tc v3 = 9 km/ h = 2,5 m/ s -Thi gian chu k hot ng ca my : 03322112 . t t nvlvlvlTs s ck+ + + + =ns - s ln thay i s, ns = 3 ts- thi gian thay i s, ts = 5s t0- thi gian quay xe, t0 = 20 s

-Nng sut:Q = tx cktg t chk TK K K q.. . . . 3600 Q =) / ( 39 , 9435 , 1 . 12 , 1598 , 0 . 8 , 0 . 1 . 8 , 8 . 36003h m =Nng sut ca my : 94,39 8 = 755,12 (m3/ ngy) Tng s ngy cng my lm vic san bng ton b khu t l :

Chn2mylmvic2camytrong1ngy.Thigianthicngsantl: T =835 , 152 . 234 , 63=(ngy) Vy ta chn T= 16 (ngy) san bng hon ton khu t. I.3.3.S di chuyn my: Vi din tch khu vc san bng kh rng, khong cch vn chuyn trung bnh tng i ngn cho my di chuyn theo hng xc nh trn theo s di chuyn hnh elip. Tun to v ri t theo cc vng ni tip nhau kn khu vc o vp. N KTTC19CHNG 1 SVTH:NGUYN TH NAM GVHD: ON VNH PHC LP: 07XD1 PHN II:THI CNG BTNG CT THP TON KHI MT CT NGANG CNG TRNH Hnh 2.1: Mt ct ngang cng trnh *S LIU THIT K: Kch thc cc cu kin trong tng nh cho nh sau: Cng trnh nh 4 tng 5 nhp Chiu rng nhp: L = 5.4 m Bc ct: B = 5m S bc ct : 26 Chiu cao tng: H= 3,3 m Dm chnh: 200 x 550 mm Dm ph: 200 x 350 mm Tit din ct: 250 x 350 mm Chiu dy sn:os= 100 mm Tit din dm bo:120 x 350 mm Tit din consol: 200 x 350 mm Chiu su chn mng:G =1,6m Mng c bc dt cp: - Chiu cao bc 1:300 mm - Chiu cao bc 2:300mm - Din tch mt di: 2000x2600 mm - Din tch mt trn: 1400x1800 mm * Cng trnh l nh cao tng c s lng cng vic tng i ging nhau, c th cu to sn mi khc so vi sn cc tng, do bin php thi cng thng c chn l thi cng dy chuyn. * Cngtrnh chn phng php thi cng b tng bng bin php th cng: trn b tng ti ch, vn chuyn ln bng vn thng. Sau dng xe kt kt v th cng vn chuyn n ni . N KTTC110CHNG 1 SVTH:NGUYN TH NAM GVHD: ON VNH PHC LP: 07XD1 * V cng tc gin gio,vn khun: cng trnh s dng vn khun thp thun tin cho qutrnhthicnglpdngvthod,mbochtlngthicng,mboviclun chuyn vn khun ti a, kt hp vi h gio bng gio Pal, h thanh chng n kim loi, h gio thao tc ng b. S dng vn khun thp, gio PAL v ct chng n kim loi c nhiu u im:- t c bn cao, duy tr c cng ln trong sut qu trnh b tng, bo m an ton cao cho vn khun. Vic lp dng c m bo chnh xc, b mt b tng thng nhn. - Vic tho lp vn khun n gin nh cc phng php lin kt thch hp, do vy khng cn cng nhn c trnh cao. y l yu t quan trng trong sut thi gian thi cng. - Chi ph thit k vn khun c gim v cc cng vic tnh ton c tnh sn, lp thnh cc bng tra. i vi cc dng vn khun c bit, cng vic thit k ch cn da trn c s c tnh sn m hiu chnh li cho thch hp. - Vn khun cng c t c thi gian s dng lu nht, c th dng cho mt haynhiucngtrnhmvnpngcyucukthut,qunlthuntin,hiuqu kinh t cao. - Hnh dng, kch thc ca tng cu kin thch hp cho vic lp dng, tho d, vnchuynbngthcng.cbit,khitmkhunchtohontonbngthpmngth trng lng rt nh. - Vn khun cng c khi km theo chng bng gin gio cng c s tr thnh mt h thng ng b, hon chnh, m bo thi cng nhanh, nng cao thm cht lng vn khun, hin trng thi cng gn gng, khng gian thong, mt bng vn chuyn tin li, an ton. -S dng b gin gio cng c (gio PAL) v ct chng n d iu chnh c chiu cao v chu ti trng ln. * (x g): chn loi g nhm III c trng lng 600 kG/m3. C ng sut cho php[o]=120(kG/cm2)(lytheotiliuKThutThiCngVNghimThuKtCuBtng V Btng Ct Thp). II.1 V CC S CU TO; TNH TON, THIT K VN KHUN V H CHNG CHO CC KT CU CT, DM, SN. A. Thit k vn khun sn: 1.Xc nh ti trng tc dng ln dm sn: Ti trng tc dng ln dm sn l lc phn b u qtt bao gm tnh ti ca b tng sn, vn khun v cc hot ti trong qu trnh thi cng . +Tnh ti:Bao gm ti trng do b tng ct thp sn v ti trng ca vn khun sn . - Ti trng do b tng ct thp sn:qbt=1x h sn= 1 x 0,12500 = 250(kG/m2) . - Ti trng do bn thn vn khun sn: qvk=30 (kG/m2) +Hot ti: Bao gm hot ti sinh ra do ngi v phng tin di chuyn trnsn, do qu trnh m btng v do b tng vo vn khun. - Hot ti sinh ra do ngi v phng tin di chuyn trn b mt sn :250 KG/m2 - Hot ti sinh ra do qu trnh m rung b tng v b tng: 200kG/m2 Vy, Tng ti trng tiu chun tc dng ln sn qtc = 250+30+0,9 ( 250+200 ) = 685 (kG/m ). 2 N KTTC111CHNG 1 SVTH:NGUYN TH NAM GVHD: ON VNH PHC LP: 07XD1 Tng ti trng tnh ton tc dng ln sn l:qtt = 250.1,2 +30.1,1 + 0,9.(250 + 200) = 708,3 ( kG/m2) . 2.Tnh ton kim tra vn sn. S tnh ton vn sn l : Coi vn sn nh dm lin tc k ln cc gi ta l cc x g lp 1(x g lp trn st tm cppha). Xtsninhnhckchthc25004800mm.Dmphrng0,2m,Dm chnh rng 0,2 m Dng vn khun:32tm loi 1200*300, 3 tm loi 1500x100, nhng ch thiu ta dng vn g lp vo. Khong cchgia cc x g lp 1 c tnh ton sao cho m bo iu kin bn viukinnnhchovnsn.Khongcchccxglp1phthucvothpvn sn. Ct ra 1 di bn c b rng b = 0,3 m bng b rng ca mt vn sn tnh ton Ti trng tc dng ln di 0,3m l:qtt =708,3 0,3=212,49 (kG/m) qtc =685 0,3=205,5 (kG/m.) CB23500054001V2V2V28*V18*V18*V1V1 = 300*1200V2 = 100*1500qMMM=ql /102l l l N KTTC112CHNG 1 SVTH:NGUYN TH NAM GVHD: ON VNH PHC LP: 07XD1 +Tnh ton theo iu kin bn : | |ax Mm M s | |2ax .10ttq lMm W o = s ViCng chu un ca vn khun kim loi:| | o = 2100 kG/cm2 Momen khng un ca tm vn khun rng 30cm:W = 6,55 (cm3) Coi di vn khun nh dm lin tc k ln cc dc ta c:

[]

+Tnh ton theo iu kin bin dng: vng gii hn cho php ca vn sn []

vng ln nht ca vn khun sn

Vi

Theo iu kin ny th khong cch ln nht ca x g:

Kt hp vi iu kin t x g lp1 theo cu to vi vn sn v vi x g lp 2 (x g lp 2 t ln ct chng ca hai gio Pal k nhau c khong cch l 1,4 m)Vy chn khong cch gia cc x g ngang l 60cm ph hp vi iu kin tnh ton v cu to.3. Tnh ton, kim tra n nh ca x g : Hxglp1ctalnhxglp2(khongcchxglp2bng150cml khong cch gia 2 ct chng ca 2 gio Pal k nhau).Chn dng x g bng g c tit din 8 10 cm c cc c trng hnh hc nh sau:Mmen qun tnh J ca x g :

cm4 M men khng un:

(cm3) S tnh ton x g l dm lin tc nhp 120cm chu ti trng phn b u m gi ta l cc x g lp 2. -Ti trng sn: qtc = 685 (kG/m2) qtt = 708,3(kG/m2) - Ti trng bn thn x g: qxg = 600 x 0,05 x 0,1 = 3 (kG/m) - Tng ti trng tc dng ln x g: qtc = 685 x 0,6 + 3 = 414 (kG/m) N KTTC113CHNG 1 SVTH:NGUYN TH NAM GVHD: ON VNH PHC LP: 07XD1 qtt = 708,3 x 0,6 + 1,1 x 3 = 424,8 (kG/m) Do l1 = 60cm l khong cch gia cc x g lp 1. +Kim tra li iu kin bn:

[o] = 120 (kG/cm2) Vy iu kin bn c m bo. +Kim tra li iu kin bin dng: vng c tnh theo cng thc:

vng cho php:[]

(Tho mn) Nh vy, tit din x g ngang chn vkhong cch gia cc x g dc b tr l tho mn. e . Kim tra s lm vic ca x g dc (x g lp 2):Tit din 10 x 15 cmc: J = 2812,5cm4 W =375 cm3 Ti trng tp trung t gia thanh l: Ptt = qtt1,2 = 424,81,2 = 509,76 (kG) Ptc = qtc1,2 = 4141,2= 496,8 (kG) Ta c M tp trung gia :

Theo iu kin bn:

< [o] = 120 (kG/cm2) (Tha mn). - Theo iu kin bin dng: vng c tnh theo cng thc:

vng cho php: []

(Tho mn) Nh vy, tit din x g dc chn v khong cch gia cc x g dc b tr l tho mn. f. Kim tra kh nng chu lc ca gio PAL Titrngtcdngln1ctchngcagioPALkhigisdindntilhnh vung cnh 1,5 1,2 (m) l: P= 1,51,2qtt = 1,51,2708,3=1275 (kG) P