METHODSTATEMENT

Red River Bridge (Thanh Tri Bridge) Construction Project Method Statement for

Package 1: Red River Bridge Construction of Pile cap & Pier

Obayashi - Sumitomo Joint Venture OSJV-MSSB-A1-EN27Gi thu PK2: Cu FRF09 Bin php thi cng dm I DL c sn Cng ty : CPXD s 10 Thng Long

NI DUNG

1.Khi qut-----2-----

2.V tr-----2-----

3.Tin thi cng-----2-----

4.S t chc ti hin trng-----2-----

5.Vt liu-----2-----

6.Thit b-----3-----

7.Quy trnh thi cng-----3-----

7.1S trnh t thi cng-----3-----

7.2M t trnh t cng vic-----5-----

8.Qun l cht lng-----26----

9.Qun l an ton-----26----

10.Qun l mi trng-----27----

1. Khi quty l bn bin php thi cng cho dm I DL b tng d ng lc c sn (Sau y xin gi tt l Dm I DL ) phc v thi cng kt cu phn trn ca cu. Chiu di dm I DL s c c ph hp vi chiu di ca mi nhp cu theo nh hng khi cu nm trong ng cong nm v thay i chiu rng mt ng trn cu. Khi lng chnh xc s c tnh ton da trn bn v thi cng c ph duyt. Bn v kt cu in hnh ca dm I DL c sn c trnh by trong bn bin php thi cng ny theo ph lc s 1.2. V trV tr c th, chi tit ca cc dm I DL s c trnh by trn bn v thi cng. 3. Tin thi cngTin thi cng c lp theo bn Tin thi cng tng th c ph duyt. Bn tin ny c th sa i cho ph hp vi tnh hnh thc t thi cng ngoi cng trng.4. S t chc hin trngS qun l cht lng cho cng vic sn xut dm I DL theo s t chc ca Lin Danh.5. Vt liuVt liu c s dng sn xut dm I DL nh sau:

SVt liuM tGhi ch

1.Ct thp

(Thp gai) (Tiu chun KT ASTM A615- Grarde 60 Mc6.4) c ph duyt

2.B tngCp A-3: cng 40 Mpa Mc 3.2 (phn 6) TCKT

c ph duyt

3.Cp d ng lc 9C15ASTM 416-90a Cp 270

(Mc 06220_2.2.2- BTDL-TCKT )Cp Siam Thi Lan

4.H thng neo(Tiu chun KT Mc 06220_2.2.3- BTDL-TCKT)Neo OVM.M15A-9

5.ng gen (Tiu chun KT Mc 06220_2.2.4- BTDL-TCKT)2B80 & 2B60B

6.Va bm(Tiu chun KT Mc 06220_2.2.5- BTDL-TCKT) c ph duyt.

Nhng vt liu khi c d tr ngoi cng trng cn phi c cch ly vi nn t v c bo v trnh ma v bi bn.6. Thit bThit b phc v cho cng tc sn xut dm I DL nh sau:

Cc thit b c nu trong bng trn s c tng cng thm trong trng hp cn thit v theo yu cu.Vic huy ng thit b trn thc t s c K s T vn gim st v chp thun theo biu mu nghim thu c duyt.7. Quy trnh thi cng7.1 Trnh t thi cng

7.2 M t trnh t thi cng7.2(1)Cng tc chun b Thi cng b c dm

Cng tc chun b mt bng cho bi c s c tin hnh trc my mc thit b v cc vt liu cn thit c huy ng ti phc v cho cng tc c dm. V tr bi c c th hin trn bn v thi cng. Nn t xung quanh khu vc c dm s c san gt bng phng v m bo n nh to iu kin tt cho vic huy ng thit b. H thng ng dn vo bi c v h thng thot nc s c b tr ph hp, thun tin. i vi mng ca b c dm, nhng loi vt liu khng ph hp nh bn hoc t hu c s c bc b v thay th bng vt liu thch hp (ct en), sau nn mng c m nn ti khi t cht K95 nhm mc ch trnh xy ra ln ti v tr b c.Huy ng Vt liu v thit b phc v thi cng c huy ng s phi c ph duyt v chp thun v d nh cc th nghim vt liu, chng nhn hiu chun cho kch d ng lc, my bm va Trc khi tin hnh thi cng, tt c cc thit b v nhn cng s c kim tra theo mu bin bn kim tra c duyt vi s c mt ca K s t vn. Trc khi tin hnh cng vic c dm, bn v thi cng cho dm I DL phi c T vn chp thun. 7.2(2)Gia cng ct thpChi tit ca ct thp nh b tr, v tr, kch thc v hnh dng c trnh by trn bn v thi cng ph hp vi bn v thit k k thut.

(Ct thp gia cng c gi tt l ct thp)

Ct thp c gia cng theo hnh dng v kch thc trnh by trn bn v thi cng c ph duyt. Th nghim vt liu ct thp c tin hnh theo Tiu chun k thut. Thit b ct thp hoc cc thit b ph hp khc s c s dng vo vic ct thp. Thit b un thp hoc un bng tay s c p dng cho vic un thp c hnh dng v kch thc nh trnh by trong bn v thi cng. Ch to ct thp s c tin hnh bng my ct ngui hoc un ngui. i vi ct thp c gia cng bng phng php nhit phi tun th s ch dn ca K s.7.2(3)B tr vn khun yVn khun s c thi cng theo hnh dng, gii hn v kch thc nh trn bn v thi cng. Vn khun c lp dng phi trnh b bin dng do ti trng tc dng. Chiu di ca dm s c c theo ng bn v thi cng. Vn khun y l vn khun kim loi c sn. Cao ca vn khun y s tun theo vng trc theo thit k ca dm I DL c sn nu c. Vic tnh ton vng trc s c trnh ring bit.

to cho cc cnh vt c mn, thng, th cc thanh g gia cng mp khng c nh hn kch thc 25mm x 25 mm.

Tt c vn khun s c v sinh sch s khng cn bi bn, du m v cc tc ng bn ngoi khc. Sau vn khun s c qut dung dch bi trn trc khi lp t. Khong trng gia cc mi ni ca vn khun s c gn kn kht trnh d va xi mng trong qu trnh b tng.

Vn khun y s c lp t theo chiu di quy nh ca dm I DL c ch ra trn bn v thi cng. c bit, u ca vn khun y ti v tr t gi c lp t c dc thch hp vi dc dc thit k lao dm ti v tr gi cu. 7.2(4)Lp t ct thp

Ct thp bao gm c thp ch cho dm ngang s c thi cng theo bn v thi cng c ph duyt.

Nhng cc b tng nh s c s dng nh nhng con k ct thp. Con k s c t xung di lp ct thp y v ct thp cnh duy tr lp b tng bo v thch hp. Mu ca con k b tng s c kim tra v th nghim trc khi K s t vn chp thun. B tng dng ch to con k l b tng cp A3. B tr in hnh ca con k b tng c trnh by nh hnh 7.2.1.

Hnh 7.2.1 B tr con k b tng in hnh Ct thp s c c nh v ghp ni bng dy thp c ng knh 0.9mm hoc ln hn. Chiu di ni ct thp v v tr s c thc hin theo bn v thi cng. Cc im giao ca ct thp s c buc cht trnh x dch trong qu trnh b tng. Ct thp s c buc cht tt c cc ch giao nhau. C nh bng mi hn s c lm nh trn bn v thi cng c ph duyt hoc theo ch dn ca K s. Ct thp sau khi lp t s c bo v trnh khng b g, trnh bi bn v du m hoc bi bn t cc vt liu khc gy nn c th lm gim s lin kt. Cc thit b ph tr cho thi cng v d nh ct ni ph tr cho vn khun bn mt cu s c b tr ti nhng v tr thch hp. Nhng chi tit ny c trnh by trn bn v thi cng. Sau khi chng hon thnh nhim v th v tr ca chng li s c hon thin gn gng bng va xi mng. Va ny c trn t xi mng v ct c thnh phn ging b tng cp A. Cc bc thc hin cng vic hon thin c trnh by nh hnh 7.2.2.1 K s t vn s tin hnh gim st v ph duyt trc khi dng vn khun.7.2(5)Lp ng gen vi neo ng gen s c lp t theo ng ng thit k v v tr th hin trn bn v thi cng c ph duyt. ng gen s c c nh v chng bng gi tm bng ct thp v c c nh cht trnh x dch trong qu trnh lun cp v trong qu trnh b tng. ng gen cp d ng lc c ni vi nhau bng ct ni, sau c cun bng dnh nha bao ph nhm mc ch trnh cho nc xi mng r r vo bn trong ng Gen trong qu trnh b tng dm. Cch thc hin mi ni ng Gen c ch ra nh hnh v 7.2.2. Thit b phu neo s c b tr chnh xc theo ng v tr v cch thc c th hin trn bn v thi cng. C 4 l bt vt trn mt phu. Mt trong s ng knh inch dng bm va bt ng gen, 3 l cn li c ng knh 8mm c dng c nh phu neo vi bn ngm bng lu lng ng knh 8mm. Xem minh ho hnh v 7.2.3. L ch bm va bt ng gen s c bo v trnh cc vt l chui vo bng nt nha.

Khng c li bt k vt cn no xt li trong ng gen trc, trong v sau khi lp t ng gen.

Hnh 7.2.2 Quy trnh ni ng Gen d ng lcTHNG S CHNH CA NEO CNG TC TRN OVM.M15A 9

Tm neong ghenu neoL xo neoKch cng

AxBKhong cch l nh vDExFGHIN

200x19017580146x5524014505YCW250B

Figure 7.2.3 Chi tit phu neo7.2(6)Lun cp vo ng gen Cp d ng lc s c lun vo bng tay theo bn v thi cng c ph duyt nh hnh 7.2.4. Cp d ng lc lun vo ng gen s c ni di thm ti thiu 60cm c hai u dm thun li cho vic t kch cng ko.

Cp s c c ct bng my ct chuyn dng hoc loi thit b ph hp trnh lm h hi cp. Khng c php s dng la hoc phng php ct bng nhit khc ct cp.

Cp d ng lc l ra u dm s c ph bng phn ng gen cn d hoc cc vt liu tm thch hp trnh h hi, bn hoc b g. M cp s c s dng thun tin cho vic lun cp v trnh nhng h hi cho ng gen d ng lc. Xem hnh minh ho m cp hnh 7.2.5. Ht sc ch trong qu trnh lun cp trnh cho ng gen b chch hng hay h hi. Cc ng gen ny phi c chnh sa li nu chng b dch chuyn hay h hng. Trong v sau qu trnh lun cp, khng c php tin hnh cc cng vic hn hoc cc cng vic c s dng la nh cng vic ct bng kh ga gip vi v tr lun cp. Cc cng tc ny c th gy ra h hi cho cp v nh hng n vic cng ko.

Hnh 7.2.4 Lun cp d ng lc V tr, hng v tnh trng ca ng gen v phu neo s c K s kim tra bi theo bn v thi cng c ph duyt vi mi 1.0m chiu di dm v ti cc im thay i hng cp. dich chuyn cho php ca ng gen v thit b neo l trong khong +5mm so vi thit k cho chiu ngang v chiu ng.

Hnh 7.2.5 Lp t m cp7.2(7)Lp t vn khun cnh Vn khun cch s c ch to t thp tm c sn. B tr ca vn khun s c lp t theo thit k vn khun trnh by trong bn v thi cng c ph duyt. Cc thanh chng s c lp t ph hp theo thit k ca vn khun. Tt c vn khun s c v sinh sch s, khng dnh bi bn, du m hoc trnh nh hng t cc vt liu khc v s c s l bng vt liu bi trn mt vn khun c ph duyt trc khi lp t. Cc thanh thp gc khng nh hn kch thc 25mm x 25mm c dng c nh cc mp vt hay cc bin sc l ra ca dm.

Trn vn khun cnh, cc l cho ct thp ch dm ngang c b tr ti cc v tr v c kch ng theo bn v thi cng c duyt. Cc l ch ny c bt kn xung quanh thanh thp ch bng vi si hoc vt liu thch hp khc khng cho va b tng trn ra ngoi trong qu trnh b tng. Trc khi ghp ni vn khun, pha bn trong vn khun s c v sinh sch s. Sau khi ghp ni vn khun xong, nu vic v sinh bn trong vn khun khng tho mn yu cu ca K s t vn th trc khi b tng, mt s vn khun s c m ra tin hnh v sinh sau cng tc nghim thu mi c.

Sau khi lp t vn khun xong, mt bui kim tra s c t chc vi s c mt ca K s t vn chp thun b tng.7.2(8) b tng Cn cu v gu b tng s c s dng cho vic b tng c dm I DL. Nc s c phun ln vn khun, ct thp v b mt ca vn khun y trc khi b tng. Vic b tng s c tin hnh theo tng lp dy xp x 50cm. B tng s c bt u t mt pha u m v c tip tc tin ti u i din.

My m rung b tng s c chn l loi c tn s thch hp c th rung m hiu qu cho loi b tng thit k vi st 2cm trn phm vi ng trn c bn knh 45cm. S lng my m rung phi kh nng c kt b tng trong vng 10 pht sau khi vo trong vn khun. t nht l 3 my m rung c d phng sn sng ti hin trng duy tr thi cng lin tc trong trng hp c s c. My rung thnh (my rung bn ngoi) s c b tr bn ngoi vn. My m rung (m di) phi ngp xuyn n lp b tng trc, qua lp b tng mi . Vic vn hnh my m rung s c tin hnh cn thn trnh lm h hi ng gen. c bit l v tr neo u dm, v tr ny s nhn c s quan tm nghim ngt khi m b tng, trnh mi khim khuyt cho b tng v khu vc ny khng cho php bt k mt s x l hay sa cha no i vi b tng dm. nh ca lp b tng th nht cng chnh l nh ca bu dm, do vy vic m b tng s c thc hin ht sc cn thn trnh cc bt kh xut hin trn b mt b tng bu dm.

u tin, cc lp b tng c m bng m di. Sau , my m thnh s c s dng m b tng t lp 1 ln lp 3 ti cc v tr thch hp trn vn khun cch. nh ca lp th hai s nm khong gia thn dm. My m thnh s c vn hnh m b tng sau khi b tng lp ny c m bng m di ging nh vi lp 1. My m rung b tng khng c s dng vn chuyn b tng bn trong vn khun trong qu trnh b tng. iu kin ca b tng s c kim tra cht ch trnh b tng b cng trc khi lp tip theo. B tng mi s c trong vng nhiu nht l 2 ting sau khi lp trc .

B tng ri vi trn b mt vn khun s c dn sch trc khi b tng.

kht ca vn khun cn c kim tra v quan trc thng xuyn trnh bin dng hoc x dch ca vn khun cng nh r r ti vn khun. Trong trng hp c x dch, vn khun s c iu chnh ngay lp tc trc khi tip tc b tng.

Vic lp t ct thp s c tin hnh cn thn trnh b dch chuyn trong qu trnh b tng. Trong trng hp c s dch chuyn, s c iu chnh ngay lp tc trc khi tip tc b tng.

Lp t ng gen s c tin hnh cn thn trnh x dch trong qu trnh b tng. Trong trng hp b x dch hoc c h hi xy ra, ngay lp tc chng s c iu chnh trc khi tip tc b tng. Tc b tng s c kim sot khng vt qu p lc thit k nh cp trong phn thit k vn khun.

Sau khi b tng, b tng ri vi thp ch s c v sinh sch s. Lp b mt b tng s c hon thin t nht 2 ln bao gm ln hon thin cui cng bng tay v s dng bay thp. Dung sai chiu cao b tng l 20mm. Th nghim b tng ti hin trng s c tin hnh trn mi xe vn chuyn theo K hoch gim st v th nghim c ph duyt. Mu b tng s c ly lm mu th nghim nn theo K hoch kim tra v th nghim c ph duyt (ITP) ph hp vi Tiu chun K thut chung iu S10.01. khng nh cng ca b tng ti thi im cng ko cp, mu s c ly b sung t nht 3 b th nghim nn (9 mu). Nhng mu dng xc nh cng b tng lc cng ko s c ch b ti hin trng vi cng iu kin nh b tng c dm I DL.Trong trng hp c s c v cn thit phi dng b tng trc khi ton b mt ct dm c hon thnh, cc bin php nh sau s c thc hin. Trong trng hp tri ma, nc ng s c gt ht khi b mt b tng trc khi lm phng b mt. Tm nha ni lng bo v s c tri trn ton b din tch b tng. Trong trng hp c s c do cn cu hoc gu b tng hng, cc thit b hng hc ny s c thay th bi thit b d phng. Tuy nhin, di s gim st v nh gi ca K s T vn nhng dm c nhng mi ni thi cng ni trn c th b loi b. Bo co chi tit v s c b tng s c thc hin nu nh s c xy ra.7.2(9)Bo v v di di vn khun cnh Phn b mt l ra ca dm (mt nh dm) s c ph lp vi hoc vt liu dng vi khc thch hp ngay sau khi cng tc hon thin b mt b tng kt thc.

Mt ngy sau khi b tng, vn khun cnh s c tho d. Ngay sau dm li c ph bng lp vi m hoc bng vt liu thch hp khc. Xem minh ho trn hnh v 7.2.9 (1). Trong iu kin ma ng, gim thi gian b tng t cng m bo cng ko, phng php bo v bng hi nc s c p dng theo Tiu chun k thut chung iu S10.03(3)(d) nh trnh by trn hnh 7.2.9(2).

Vic d b vn khun s c tin hnh cn thn trnh gy h hi hoc lm hng b mt b tng v cc thp ch. Trong trng hp dm c tp kt trong mt thi gian di sau khi c, b mt ca thp ch dm ngang v bn mt cu s c qut xi mng trnh b n mn v g.

Sau khi d b vn khun, b mt ca b tng ni thi cng dm ngang s c x l to nhm nh mi ni thi cng.

Figure 7.2.9(1) Bo dng dm I DL - 1

Hnh v 7.2.9(2) Bo dng dm I DL-27.2(10)Cng ko cp d ng lcTrnh t chung cc bc cng ko DL c th hin nh hnh di y (Hnh 7.2.10).

Figure 7.2.10 Trnh t chung cng tc cng koI. Cng tc chun b Trc khi tin hnh cc cng vic, tt c cc thit b v nhn cng s c kim tra theo biu mu c duyt vi s tham gia ca K s. Tin hnh hiu chun kch v bm d ng lc ti phng th nghim u quyn c ph duyt (IBST) vi s chng kin ca K s.

Chng ch cho vic kim nh ni trn s c bo co cho K s ph duyt, v iu ny s ch ra mi quan h gia s c trn p k v gi tr lc cng thc k trn kch. S kt hp gia kch v bm cng s c kim tra.

II. Cng ko thng sut ko s c kim sot thng qua h s ma st ca ng Gen DL. Cc thng s cn thit dng kim sot ng sut l h s ma st v m un n hi biu kin ca cp (Ep). c c cc gi tr h s ma st v m un n hi biu kin ca cp DL, ko th s c tin hnh trn dm u tin. Vic ko th s c tin hnh i vi c 3 b cp trn dm. Cc bc tin hnh ko th nh sau:(1)Lp t neo v kch.Neo s c lp nhng khng lp nm. Kch c lp c hai u dm. Mt u (gi l kch A) dng cng ko, u kia (gi l kch B) khng dng cng. Kch B c t c nh v kho van thu lc. Trc khi cng, ko vi ln kch ca kch B s to iu kin tho kch d dng sau khi cng ko. Xem minh ho cch t tn kch trn hnh 7.2.11.

(2)Trc khi cng koD ng lc trong cp s t ti 5Mpa (50bar) nh ko kch A. nh du v o dn di trn cp cui kch A. ng thi nh du v o rt ngn ca cp cui kch B.

Figure 7.2.11 B tr kch cho ko th(3)Thc hin cng koVic cng ko tip tc c thc hin tng nc 5Mpa (tng ng vi 50Bar) mt ln kch A cho ti khi t p lc cui cng. (4)o chiu cng koVn trn b trc, qu trnh cng cp d ng lc li c tin hnh nhng lc ny kch A c nh cn kch B th hot ng. Cc bc cng ko lp li ging nh cc bc t (1) n (3) trn.(5)Tip tc thc hin cc bc nh trn t (1) n (4) i vi cc b cp khc.Sau khi b cp u hin c cng ko xong, ko th s c thc hin cho cc b cp cn li theo trnh t t bc (1) n bc (4).H s ma st () v mun n hi biu kin (Ep) ca cp s c tnh ton da trn s liu ghi chp ko th trn dm th nht. Bo co c np cng vi kt qu tnh ton ca h s ma st v mun n hi biu kin ca cp c s dng iu khin ng sut cng ko cho cc dm chnh thc.

Nhng vt liu v dm dng cho cng tc cng ko th cng s c dng cho cng tc cng ko d ng lc chnh thc.

III. Xy dng ton kim sot ng sut cng koTon kim sot ng sut cng ko s c xy dng t h s ma st () v mun n hi biu kin (Ep) m hai gi tr ny thu c qua cng tc ko thTon kim sot ng sut cng ko s c trnh v ch K s t vn ph duyt trc khi tin hnh cng tc cng ko.IV. Cng ko chnh thc d ng lc cho dm ITrnh t ca cng tc cng ko DL chnh thc c th hin nh sau: (Xem hnh 7.2.12)

Figure 7.2.12 Trnh t cng tc cng ko DLTrc khi cng ko, cng b tng dm c xc nh bng trung bnh cng cng nn 3 mu m cc cc mu ny c ch b v bo dng trong cng iu kin ca dm. Cng ca b tng dm lc ny s phi ln hn 90% cng thit k.Di y l trnh t cc bc cng ko DL:(1)Tho b vn khun y ti v tr gi Vn khun y ti v tr gi s c tho b v thay th bng tm m cao su nhm mc ch thch ng vi s bin dng vng ca dm trong khi cng ko.

Figure 7.2.13 Lp t m cao su ti v tr gi (2) Lp t neo v nm

Trc khi lp neo, b mt ca phu neo s c v sinh ht cc va b tng dnh vo trnh gy ra cc khe h gia phu neo v neo. Neo c c nh bng cc nm nh th hin trong Hnh 7.2.14. Trc khi lp neo v nm th mt ngoi ca nm hoc mt trong ca l nm trn neo s c bi m m bo nm c sit vo neo mt cch m thun trong qu trnh cng ko.

Hnh 7.2.14 Lp t neo(3)Lp t kch v bm thu lc Ch nhng t hp bm v kch c chp thun mi c a vo cng ko. Kch cng s c lp c hai u dm ch c v tr neo. Kch s c lp t cn thn theo trc ca cp trnh ng sut phn b khng u ln cc tao cp. Kch s c a vo v tr neo bng cn cu hoc h thng rng rc c b tr gi treo. Kch s c treo ti ng v tr trc khi tin hnh cng ko.

Sau khi n nh v tr kch, bm thu lc c chp thun s c ni vi kch.

i vi mi nc cng cp, s c trn p k theo yu cu phi ph hp vi gi tr hiu chnh ca kch v bm. Nhng gi tr ny s c ghi chp v tng hp thnh bng ngay ti cng trng.

S ngi ph trch cng tc cng ko cp DL s c b tr nh hnh di y (Hnh 7.2.15).

SNhn lcM t vai trS ngi

1.K s trng iu khin chung 1 ngi

2.K s Lp ton kim sot ng sut1 ngi

3.Ngi vn hnh Vn hnh bm thu lc2 ngi

4.Cng nhn lnh ngh Kim tra gin di2 ngi

5.Cng nhn lnh ngh Cho cc cng vic chung2 ngi

Hnh 7.2.15 B tr ngi ph trch Tm chn bo v s c t pha sau kch m bo an ton v tt c nhng ngi tham gia cng ko ti hin trng s c cnh bo trnh xa pha sau kch trong qu trnh thao tc cng ko.(4) p dng cng ko trn tng b cp c thTrnh t cng ko DL trn tng loi dm c th hin nh hnh v 7.2.16.

Hnh 7.2.16 Trnh t cng ko DL trn dmTrnh t c th cho tng bc cng ko c m t nh di sau:(4-i)Bt u cng ko Vic cng ko s c thc hin trn c hai kch. u tin cp s c cng n 5MPa (50Bar) theo s c trn p k loi b ht nhng yu t nh hng ph n kt qu cng ko trn cc tao cp. Sau p lc kch li c gim v 0. Cp DL s c nh du phn sau neo bng cch phun mu ln phn cp ny vi mc ch kim tra bng mt s trt dch chuyn ca cp trong kch trong qu trnh cng ko hoc s dch chuyn nm cp sau khi cng ko. Tip , cp c cng li n p lc 5Mpa (50Bar) v vic nh du trn cp c thc hin o gin di khi ko. Xem minh ho hnh 7.2.17 Tin hnh kim tra iu kin tip xc gia neo v phu neo cng nh gia b mt kch v neo. Nu nh kim tra thy vn cn nhng khe h ti nhng v tr ni trn hoc kch cha c t ng tm, p lc trn kch s phi gim v khng v sau tin hnh ko li n 5Mpa theo s c trn p k.

Hnh 7.2.17 nh u trn cp o dn di(4-ii)Cng ko n lc kt thc Vic cng ko DL c thc hin tng nc vi bc l 5MPa (50Bar) theo s c p k. Xem hnh v 7.2.18.

Sau mi nc cng ko, dn di ca cp s c o c v ghi chp vo biu kim sot ng sut, hnh v 7.2.19.

Khi ng sut ko xp x t 75% ng sut ko cui cng, k mt ng ni cc im ghi trn biu kim sot ng sut. Sau dch chuyn tnh tin ng ny v gc (0.0) v ng ny c gi l ng khng ch. Giao im ca ng khng ch v ng gii hn ng sut l im dng cng ko. Xem minh ho trn hnh v 7.2.19.

Sau khi k c ng khng ch, cn thit kim tra xem ng ny c nm trong phm vi gii hn cho php c v trn biu kim sot ng sut hay khng.

Cp DL s tip tc c ko cho ti khi t lc cng ko cui cng. H s ma st thc t s c xc nh trn ton kim sot ng sut ko v c ghi li gi tr. N c xc nh thng qua giao im gia ng khng ch v ng mun n hi biu kin Ep

Hnh 7.2.18 Kch v cch o dn di cp

Hnh 7.2.19 Kim sot ng sut ko Nu ng khng ch nm ngoi phm vi gii hn trn ton kim sot ng sut, th vic cng ko s b dng li. Sau tnh trng ca kch v cp s c kim tra. Sau cng bo co v s c dn n thi cng khng lin tc v xut gii php khc phc s thit c. Khng cho php ng sut ko cp vt qu ng gii hn ko.(4-iii)Nh p v tho d kch ko Sau khi o c dn di cp ng vi cp lc ko cp cui cng, p lc kch s c nh dn n gi tr bng 5MPa (50Bar). rt ngn ca cp s c o c v tnh ton c xt n dn d ca cp DL trong kch di p lc ko bng 5Mpa. Xc nhn rt ngn thc t l nh hn rt ngn cho php.

Sau khi o xong rt ngn cp, p lc kch s c nh ht v 0 v kch c tho b.(5) Chuyn sang cng ko cc b cp tip theoKch s c chuyn ti b tr cho b cp tip theo v cc bc thc hin cng ko nh cp trn s c lp li.

(6) Kim sot khi cng ko nhiu b cp trn dmSau khi hon thnh cng ko cho cc b cp trn mi dm cc d liu ghi c trn ton kim sot ng sut s c tng hp li theo biu kim sot lm vic theo nhm v thng s . Mt dm s c lm thnh mt nhm. Gii hn kim sot nhm c thit lp nh di y.

ng gii hn trn:+ a

ng gii hn di: - a

: Dung sai a c ly theo bng 7.2.2.

Bng 7.2.2 Dung sai kim sot nhm cp

Kim sot theo nhm c mc ch nh gi iu kin cng ko thng qua thng s v da trn lch tiu chun () ca (phng php 2) trnh nhng h hi trong mi ln cng ko. iu ny c xem nh l khng c h hi g trong qu trnh cng ko DL trn mi dm thm tr ng kim sot theo nhm vt qu gii hn.V vy, vic nh gi cng tc cng ko theo biu kim sot nhm c trnh by nh sau: Trng hp m cc im trn biu nm trong phm vi gii hn cho php l trng hp thng thng. Nu nh c xy ra trng hp cc im vt qu gii hn nhng khng qu 1/20 th vn c xem l cha c s c. Bi v theo phng php 2 th cc im vt qu gii hn 1/20 l kh nng c th xy ra. Nu nh xy ra trng hp cc im vt qu gii hn 1/20 th cn thit phi iu tra xem nguyn nhn l do vn hnh cng ko, trnh t cng ko, do thit b hay do cc nhn t khc. Nu nh trn biu c lin tc 5 im xut hin v cng mt pha so vi ng trung tm (thp hn hoc cao hn) th cn thit phi tm hiu nguyn nhn v a ra gii php khc phc. Nu nh c by 7 im c v lin tc tng hoc lin tc gim th cn thit phi tm hiu nguyn nhn cng nh a ra gii php khc phc. Nu kt qu ko th c cho l khng i din cho nhng ln ko thc th cng vic kim sot ng sut cng ko cho nhm hay tng ln cng ko s c xem xt v iu chnh c lu ti s bin i tiu chun ca h s ma st o c thc t sau khong 20 ln cng ko.Ton kim sot ng sut v biu kim sot nhm s c trnh ln K s t vn ngay sau mi ln cng ko cho mt dm.(7) Theo di vng ca dm. Cng tc chun b:

Dng giy k ly gn cht vo cc v tr u dm, gia dm v 1/4 dm (5 im).

Dng my thu bnh ngm cao c nh trn giy k ly ti cc im theo di vng ca dm trong qu trnh cng ko.

(8) Theo di chuyn v ngang ca dm. Khi chun b cng ko ta xc nh tim dc dm bng my kinh v v nh du ti 3 im gia dm v hai u dm. C nh my kinh v li chc chn.

Trong sut qu trnh cng ko sau mi b thp, u phi kim tra v tr tim dc dm v xc nh sai s v v tr so vi mc ban u (nu c).

(9) Ct cp neo. Sau khi kt qu cng ko c K s t vn chp thun, s tin hnh ct cp neo. Neo sau khi cp phi m bo cn tha t nht l 3cm nh th hin trn hnh 7.2.20.

Ct cp s c s dng thit b ct chuyn dng.

Hnh 7.2.20 Ct cp sau khi cng ko7.2(11)Vn chuyn dm sang bi cha dmSau khi cng ko, dm I DL s c bc khi b c v chuyn sang bi cha. Trnh t vn chuyn dm nh sau:Bc 1:

Lp khi nng vo lifting hole ca dm t 2 kch thu lc vo c 2 bn ca mi u dm Chi tit ca khi nng c th hin ph lc -8

Bc 2:

Nng dm ln khi b xp x 200mm bng 2 kch u dm.

Kch nng s chu ti ca tng u dm lp xe y.

Bc 3:

t xe y vo pha di ca dm. T t h kch t y ca dm ln xe y. Tho kch ra. Lp thanh chng cho trn xe y dm. Vic ny c tin hnh cho tng u dm Lp ng gong (bng thanh thp C 200x50) cho xe y

Bc 4:

Ni cp ko vo xe y

Bt u di chuyn dm ti v tr cha tht chm vi s ko ca xe y bi ti c kh hoc thit b khc.

Bc 5:

Dng di chuyn ti v tr cha dm.

Bc 6:

Lp 2 kch thu lc vo 2 bn dm, trc tin cho 1 u dm. Lp thanh ta di ng vo y dm.

Bc 7:

Nng dm n chiu cao ly xe y ra.

Bc 8:

Ly xe y ra khi y dm. Kim tra v tr t thanh ta di ng. H kch t t dm ta ln thanh ta.

Bc 9:

Tho kch v khi nng. Lp thanh chng cho tm.(tin trnh t bc 6 n bc 10 c thc hin cho tng dm)

S t chc di chuyn dm I DL c nh km trong ph lc 8iu c bit ch l trong khi kch phi kim tra s cn bng c 2 bn ca dm, s n nh ca khi nng v ca c dm. Khng ai c php ng 2 bn dm trong qu trnh di chuyn. Sc ko ca xe y phi t t vi tc nh nhau 2 u dm.

Sau khi vic di chuyn hon thnh, s n nh ca dm v iu kin lm vic ca gi ta tm phi c kim tra rt cn thn.

7.2(12)X l u dm I DL Vic chn kht cho v tr neo ca cp ng sut trc c thc hin bi b tng ti ch trc khi bm va vo ng gen. B mt tip xc vi b tng ti ch u dm c x l bng nh nh mi ni thi cng. iu kin lm vic ca thit b neo nh l neo brocks, tao cp v nm phi c kim tra cn thn. Nu bn hoc c g, chng phi c lm sch.

Trc khi lp vn khun u dm I DL, vi bm va vi ct nha PVC chuyn i s c lp chnh xc nh hnh v 7.2.21. Ct nha PVC ny c bt vt vo l ren (ng knh.3/4) trn thit b neo.V u khuu vung gc ca ct c ni vi vi bm theo chiu thng ng. Vi bm c ni cht vi ct PVC bng dy thp. Vi bm c c nh vo thanh thp trn nh ca dm gi vi thng trnh b un gy tc vi.

Hnh 7.2.21 Ni vi bm va vi thit b neo Vn khun u dm s c b tr theo hnh v 7.2.22.

B tng c s c cng thnh phn ca dm I DL d ng lc (Cp A-3).

B tng s c bng gu b tng v mng. B tng s c m nn vi my m ri thch hp mt cch cn thn trnh h hi ng bm va v b un.

Hnh 7.2.22 Ni ng bm va vi thit b neo Trc khi b tng phi c nhm u dm.

Kch thc hnh hc ca n phi m bo theo thit k.

Khng c hn ct thp bt u dm vo neo v cp CC.

Vic bo dng phi c thc hin nh bo dng b tng dm.

7.2(13)Cng tc bm va vo ng genCng tc bm va c thc hin theo s 7.2.23.

Hnh 7.2.23 Cc bc bm va vo ng genM t tng bc cng vic nh sau:1.Cc cng tc chun b: Trc khi tin hnh cng tc va, vic huy ng thit b v nhn lc s c K s gim st v ph duyt. ng bm va (PC grout) s c thc hin theo iu S10.03. Cc vt liu v t l ca vt liu trong va c xut ring bit. Thit b nh my trn v bm va s c b tr nh hnh 7.2.23. Vi bm va c kt ni chc chn vi vi c trong dm.2.Kim tra s thng kh v v sinh ng gen

Vi kh t my nn kh c ni vi 1 u ca vi bm va v khng kh s c cp vo trong ng gen. S thng kh ca ng gen c kim tra u kia ca vi bm va,

Cng lc , nc tha v cc vt liu thi s b thi ra ngoi.

Nu khng thng tc l ng b tc. Trong trng hp ny, v tr v iu kin tc phi c kim tra nhanh chng a ra bin php khc phc.

3.Trn va

Mi m trn thc t s theo s chp thun t l trn.

Qui trnh trn nh sau 1. Nc + Sikament R4 2. Xi mng 3. Intraplast Z (trn trong 4 pht)

Sau khi trn xong, va s c a qua mng lc vi mt mng ln nht l 1.2mm trc khi a vo bm. Sau khi trn, th nghim ti hin trng s c tin hnh nh bng 7.2.3.

Bng 7.2.3 Kim tra ti ch cho va bmSHng mcvTiu chunPhng php th nghim

1.Lng thi giangiy> 13.0ASTM C939

< 25.0

2.Nhit oCnh hn 35oC

3.Cng nn(Ly mu)MPanhiu hn 32MPa trong 28 ngyTCN247-98

*t nht l 6 mu (707070mm) mi dm PC-I s c ch to.(3 mu mi ln th nghim cng nn trong 7 ngy v 28 ngy)

Tt c va s c lc qua 1 mng lc vi mt mng lc c kch thc ln nht l 1.20mm trc khi dc da vo bm. Va s c s dng trong vng 30 pht sau khi trn ca mi trm trn m bo chy v trng n.4.Bm va M tt c cc l thot va.

Vi bm ca bm c ni vi 1 u l bm va ca dm.

B tr ngi trong t bm theo hnh 7.2.23.

Va s c bm qua ng v chy lin tc qua ca x u tin sau khi qua ca thu, cho n khi khng cn s hin din ca nc hay khng kh m ch cn va c phun ra, ti thi im ny ca x s c ng. p lc bm ti ca thu s khng vt qu 1.0 MPa.

Sau khi ng ca x, p lc 0.5 MPa s c duy tr trong vng mt pht. Sau khi duy tr p lc trong vng mt pht, p lc bm ca ca thu s c gim i v iu kin ca va ti ng thu s c xc nh va c chy ngc hay b gim p khng .

Sau giai on trn, p lc s li c tng ln n 0.5 MPa. V ca thu s c ng li. (p lc 0.5MPa gim p p lc 0.5MPa ng ca x)

Vic ng ca x v ca thu s c tin hnh bng vic o kho cht v kt cht ca vi bm. Sau khi bm va xong, ng bm va s c duy tr theo chiu thng ng nh hnh 7.2.24. Chiu di ca on vi bm l trn mt b tng ln hn 1m, trong 1 ngy. Trong trng hp bm va b gin on do c s c v my mc hoc cc l do khc trc khi hon thnh, tt c ch va c bm s c x ra ngoi ng bng nc c bm t my bm hoc bng cc thit b thch hp khc ngay lp tc.

Hnh 7.2.23 Cng tc bm va

Hnh 7.2.24 X l ng bm va sau khi bm5. Ct vi bm Sau khi bm va 1 ngy, s thot hi c kim tra bng mt thng trong vi bm tha l .

Nu thy s thot hi trong vi, n s c nghim thu cho cng tc bm va u vi l ny ( du vi pha trn dm) Sau khi xc nh s thot hi, u vi tha se c ct st vi b mt b tng ca dm Dm s khng c di chuyn trong vng 48 ting sau khi bm va.

8. Qun l cht lng

Ton b quy trnh s c k s chuyn trch kim tra k lng thc hin. Qun l cht lng cn c tin hnh theo bin php thi cng v cc tiu chun c th p dng khc. Mi dm I DL s c nh du duy nht v vnh cu th hin tn ca dm (s dm) v ngy c.Dung sai i vi cc kt cu b tngNi chung, dung sai ca cc kt cu b tng s c tun theo iu SS.10 ca Tiu chun k thut c bit. Tuy nhin, iu ny cn tu thuc vo thay i theo ch o ca K s. Dung sai i vi cc kt cu b tng nh sau sau khi hon thnh cng vic s khng c vt qu.

1)Kch thc mt ct ca dm

8mm

2)B tng ph v bc ca ct thp

a.B tng ph cho kt cu trn

5mm

b.Bc ca ct thp

10mm

3)V tr ca cp d ng lc

a.Chiu ngang v dc

5mmChiu di v vng trc ca dm s c xut ring bit.9. Kim sot an ton

Trc khi bt u cng tc kt cu di, cc vn nh sau cn phi c tt c mi ngi lm vic ti cng trng hiu r hon thnh cng vic thi cng kt cu di hiu qu m khng c tai nn hay thng vong no xy ra.9.1 Hp phi hpTrc khi tin hnh bt c cng vic g, cn phi t chc mt cuc hp phi hp vi s c mt ca tt c cc nhn vin c lin quan vi mc ch gii thch khi qut v ton b ni dung cng vic cng nh bin php thc hin cng vic thi cng hiu qu.9.2 Cc hng dn c bnTt c cng nhn phi mang bo h (PPE) mi lc nh i m bo h, i ng, gng tay v mc qun o bo h lao ng.9.3 Trnh tai nn trong qu trnh cng koCng nhn khng c php pha sau ca kch ko trong qu trnh kch v o c.9.4 Trnh tai nn trong qu trnh bm va

Phi hp thi cng nhp nhng c bit ngay khi kt thc bm va trnh n vi bm v c s dng p lc.9.5 Trnh tai nn gy ra bi thit b nng

Ch c ngi vn hnh lnh ngh mi c php vn hnh thit b ti cng trng. Trong trng hp c ngi vn hnh mi, cn phi kim tra nng lc trc khi chp thun c tin hnh cng vic. S kim tra phng trnh tai nn s c tin hnh thng xuyn vi thit b thi cng ti cng trng trc khi a v vn hnh. S n nh ca khu vc thi cng v b my s c kim tra k cng ti cc v tr ca dm cha ra v ng i ca cu.9.6 Phng trnh tai nn v in

Thit b pht in s c bo v nghim ngt v c tip t ng cch. Dy in s bc bng bng dnh in chng h. Ch c ngi vn hnh lnh ngh mi c php vn hnh thit b ti cng trng.9.7 Phng trnh tai nn khi lm ca mH thng chiu sng y s c thit lp phc v cng tc thi cng vo ban m v c bit l lp dng sn thi cng. Ton b khu vc thi cng s c chiu sng nu cn thit.9.8 Cc cng trnh cng cng hin cCc cng trnh cng cng hin c c bit l ng dy in trn cao, ng ng dn nc, ng dy truyn thng v cc cng trnh quan trng khc xung quanh khu vc thi cng s c ch trnh b h hi.10. Bo v mi trngTrch nhim vi mi trng xung quanh trong khi thi cng kt cu di c tun theo iu kin hp ng v lut php ca nh nc Vit Nam v bo v mi trng v cc php ch lin quan khc nh: Ngh nh Chnh ph s 175/CP, Ngh nh Chnh ph v thc hin lut bo v mi trng, 1994.

Nu c bt k vn g xy ra ti hin trng, cc bin php tho g hoc bo v s c quyt nh v thc thi ngay lp tc.

Mesure Elongation

Revision A1, June16, 2003 PAGE 6/28

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General Procedure of Prestressing

(I)Cng tc chun b

* Kim tra huy ng thit b v nhn lc

* Xc nhn kt qu kim nh ca kch v bm

(II)Cng tc cng ko th cho dm u tin

* Cng ko th cho dm u tin

thu c "'"and "E'p" cho s kim sot ng sut cng ko.

* Trnh bo co cho cng tc cng ko th

(III)Xy dng ton ng sut cng ko

(IV)C nh ng sut cng ko cho dm I DL

(4)Installation of Anchorage Block with Wedges

(5)Setting Pump and Jacks

(6)Setting Pump and Jacks

_1336836887.xlsSheet1

Quy trnh thi cngTin hnh cng vic

(1)Chun b b c dm (Bi c)*Chun b v tr b c dm

Huy ng*Thi cng mng b c dm

*Gim st huy ng nhn cng v thit b

*Ph duyt vt liu (Cp, h thng neo, ng dn)

*Xc nhn ph duyt bn v thi cng

(2)Ch to lng thp*Th nghim vt liu ct thp c chuyn ti

*Gim st hnh dng v kch thc ca lng thp c ch to

(3)t vn khun y*Kim tra cao v chiu di ca vn khun y

*Kim tra dc iu chnh ti gi (loi b tng bt u dm)

*Kim tra n nh ca vn khun y (ni, chng )

(4)Lp t ct thp*Kim tra ct thp sau khi lp t

(V tr, khong cch , b tng bo v theo mi bn v c duyt)

(5)Lp t ng gen cng vi thit b neo*Kim tra s thng hng v v tr ca ng gen

*Kim tra v tr v c nh u ca thit b neo

(6)a cp d ng lc vo ng gen*Kim tra chiu di ca cp d ng lc (s d chiu di kch) l hn 60 cm

(7)Lp t v c dnh vn khun thnh*Kim tra n nh v thng ng ca vn khun

*Kim tra b tng ph ca ct thp cng vi con k b tng

(8) b tng*Kim tra ngun cung cp b tng

*Xc nh chiu dy ca lp b tng

*Kim tra tc

*Kim tra n nh v bin dng ca vn khun trong qu trnh

*Kim tra dch chuyn ca ng gen v ct thp trong qu trnh

*Th nghim b tng c vn chuyn ti hin trng

*Ly mu cho th nghim bn nn

(9)Bo v v di di vn khun cnh*Xc nh khong thi gian (24 gi sau khi )

*Che ph bng bt nha bo v

(10)Cng ko cp d ng lc*Xc nhn v ph duyt kim nh kch v bm

*Xc nhn v ph duyt biu cng ko

*Kim tra cng b tng (90% ca thit k)

*Kim tra v ph duyt ca K s v kt qu cng ko

(11)Di chuyn dm n bi d tr*Xc nh n nh di chuyn dm v quy trnh an ton

(12)X l u dm I d ng lc*Kim tra iu kin cp d ng lc (Neo, nm chn, cp)

(13)Va cho ng ghen d ng lc*Kim tra iu kin ct cp v capping end-anchornate

*Kim tra cp phi trn thc t ca va

*Th nghim va t hin trng

*Kim tra p lc bm va

*Ly mu cho th nghim bn nn

Lao dm

_1364709787.xlsSheet1

SHng mcM tHng mc cng vicGhi ch

Ct thpVn khunCtc b tngCng ko, bm va

1.Cn cu phc v20 tn111

2.My ct thpK ln nht 32mm2

3.My un thpK ln nht 32mm2

4.My pht in50~ 150 kVA1111

5.My hn14KW hoc tng g4

6.Gu b tng1.0~ 1.2m31

7.My nn kh7kg/cm2 - p sut1 lm sch

8.Thit b kho st1

9.m rung b tngD308

10.m thnh220HZ (gn vo VK)15

11.Trm trn50m3/ gi1

12.Xe ti trn6

13.H thng chiu sng1

14.Vn khunVn khun thp1 units

15.Kch d ng lc2900 kN4

16.Bm d ng lc4

17.Trn va225ltr.2

18.Bm valn nht 1MPa2

19.Tc nc2.0~ 4.0m32

20.Xe gong2dng vn chuyn dm

21.Thit b khc1

_1215332600.xlsSheet1

General Procedure of Prestressing

(I)Preparation Work

* Inspection of Mobilization of Equipment & Worker

* Confirmation of calibration result of Jacks and Pumps

(II)Test Prestressing on 1st PCI Girder

* Test Prestressing on 1st PCI girder

in order to obtain "'"and "E'p" for prestressing control.

* Report on Test Prestressing shall be submitted.

(III)Provision and approval of Prestressing Control Chart

(IV)Permanent Prestressing on PCI Girders

(1)Di vn khun y ti gi

(2)Lp neo v nm

(3)Lp kch v bm thu lc cng ko

(4)Cng ko cho tng b cp DL

* Bt u cng ko (ko n 50 Bar theo s c trn p k)

* nh du trn tao cp o dn di

* Cng ko tng nc 50Bar theo s c trn p sut k

* o dn di ca mi ln cng ko

* T cc im v 1 ng ln ton .

(xp x 75% cho ln cng cui, xp x 450Bar)

* Kim tra lc cng cui cng theo biu kim ton

Kim tra ng sut cng ko c nm trong gii hn ca ton

* Ghi li "' trn biu

* Gim p v 50Bar theo s c trn p sut k

* o Pull-in

* Gim p lc v vch 0Bar v tho kch ra

(5)Chuyn sang cng b cp tip theo

(6)Kim sot khi cng nhiu b cp

(7)Ct cp neo

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1.Cc cng tc chun b

*Kim tra huy ng thit b v nhn cng

*Ph duyt vt liu v cp phi trn

*B tr thit b (My bm v trn va)

* B tr ng bm va

2.Kim tra s thng sut v v sinh ng gen

3.Trn va

*Trn va vi cp phi trn c ph duyt

*Th nghim va ti hin trng

4.Bm va

* Va khng c bm gin on vo ng

* Kim tra iu kin chy ca va

* Duy tr p lc bm 0.5MPa

* Hn ch p lc phun ca vi l 0.5MPa

* Dng bm

* Gi vi thng ng v c nh

( sau 1 ngy bm va)

6.Ct vi bm va

Kim tra cng v chy ca va

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