TCCST I U C HU N C S B GIAO THNG VN TI TNG CC NG B VIT NAM TCCS 02:2010/TCBVN Xut bn ln 1 TIU CHUN THI CNG CU NG B - AASHTO LRFD AASHTO LRFD Bridge Construction Specifications H NI - 2010 TCCS 02:2010/TCBVN 1 Li ni u Tiu chun ny c bin dch t Tiu chun thi cng cu ng b AASHTO LRFD phin bn ban hnh nm 2004 v c b sung cc sa i ca phin bn ban hnh nm 2007. Cc ni dung ca Tiu chun gc c bn c gi nguyn nh c v ch sa i mt s ch sai st trong nguyn bn ting Anh.B Giao thng Vn ti c cng vn s 8579/BGTVT-KHCN ngy 4/12/2009 ngh Cc ng b Vit Nam (nay l Tng cc ng b Vit Nam) t chc cng b tiu chun ny di dng tiu chun cs(TCCS).Ngy20/8/2010,BGiaothngVnticvnbns5756/BGTVT-KHCNngh Tng cc ng b Vit Nam cng b v p dng th nghim trong vng 2 nm. TCCS 02:2010/TCBVN do Hi cu ng Vit Nam bin son, V Khoa hc Cng ngh ca B Giao thng Vn ti xt duyt, Tng cc ng b Vit Nam ban hnh.

TCCS 02:2010/TCBVN 1 NI DUNG TIU CHUN TiuchunnybaogmPhnmuv32phncbindchtTiuchunthicngcu AASHTO LRFD ln xut bn th 2 nm 2004 theo h n v o lng quc t SI, c th nh sau :1.o v lp kt cu 2.Tho d kt cu hin c 3.Cng trnh tm 4.Mng cc ng 5.Cc khoan v ging khoan 6.Neo t 7.Cc kt cu chn t 8.Kt cu b tng 9.Ct thp 10.To ng sut trc 11.Kt cu thp 12.Mt cu mng dm thp 13.Sn 14. xy 15.Cng trnh xy bng khi b tng v gch 16.Kt cu g 17.X l bo qun g 18.Gi cu 19.Tm bt khe ni mt cu 20.Lan can 21.Lp phng nc 22.Bo v mi dc 23.Kim loi linh tinh 24.Va phun bng kh nn 25.Tm lt hm bng b tng v thp 26.Cng kim loi 27.Cng b tng 28.B mt chu mi mn 29.Neo chn 30.ng nha do nhit 31.Kt cu nhm 32.B truyn va p TCCS 02:2010/TCBVN 2 PHN M U 1.M u tin s dng, phn Ch gii (Commentary) vi k t C trc ca mi iu c thc hin ngay sau mi iu ch khng vit thnh ct trang bn phi ca phn tiu chun nh trong bn gc, hoc lpthnhschring nhtrongGiithchtiuchunthitkcu22TCN272.05.Phnnycin nghing phn bit vi phn Tiu chun. Trong ti liu gc khng c mc nh ngha (thut ng) nh Tiu chun thit k nn chng ti khng lp thm. Mt s thut ng mi c ch gii khi xut hin ln u trong Tiu chun Tiu chun thi cng cu v c bn c trnh by theo mu ca TCVN 1-2: 2003. Phn 2 : Quy nh v trnh by v th hin ni dung Tiu chun Vit Nam v Thng t s 21 & 22/2007/TT-KHCN ngy 28/9/2007 ca B Khoa hc cng ngh hng dn v xy dng v p dng tiu chun. C bit c theo cch ca AASHTO tin i chiu. Trong Tiu chun ny cc t Ch u t (Owner), Nh thu (Contractor) v K s (Engineer) c vit hoa l ch 3 vai chnh trong cc hp ng thi cng xy dng theo c ch th trng. Trong K s chiulkstvngimsttrngcadn(hockstvngimstcngtau nhim). Cn k s ng b chuyn nghip l k s ca Nh thu. Khi cha c h thng ng b k s c hiu l k s chuyn nghip ca nh thu. Tn cc iu nh cp 5 (1.1.1.1.1) dng ch thng vit nghing theo nh bn gc. Thut ng nc ngoi do cha c trao i thng nht nn c ch tm dng nguyn gc ting Anh, c ch phin m Vit theo t in hoc theo m Vit ho ph cp. HuhtccTiuchuntrchdntrongTiuchunnylthuchthngTiuchunAASHTOv ASTM,nhngcngcnmtsTiuchunca cclnhvckhccaHoaK.Cctiliu vin dn bng ting Anh cui mi phn vn nguyn ting Anh tin s dng. Ch thch v nguyn bn ting Anh ca Tiu chun thi cng cu AASHTO LRFD: oTiuchunthicngcuAASHTOLRFDltiliusonghnhcngTiuchunthitkcu AASHTO LFRD m Cc ng b lin bang Hoa K cng cc bang t ra mc tiu l sau nm 2007 cc Tiu chun LRFD phi c dng thit k cc cu mi. oCc Tiu chun tm thi (Interim Specifications) thng c pht hnh vo gia nm, c gi tr nh cc Tiu chun, gm cc sa i d kin c t nht 2/3 thnh vin ca Tiu ban cu v kt cu chp thun v s a vo ln xut bn mi. oTiu chun thi cng cu AASHTO LRFD xut bn ln th hai nm 2004 cng cc Tiu chun tm thi cc nm 2006 v 2007 l ti liu cp nht ti 2007 ca AASHTO v thi cng cu. oNguynbntingAnhdngchoc2hnvolngHoak(US.Units)vnvo lng quc t (SI. Units). Trong bn dch ny ch dng h n v quc t tin s dng. Trong 32 phncaTiu chunthicngcu AASHTO LRFD2004sovi PhnIIcaTiuchunthi cng cu AASHTO LRFD 1998 v ca Tiu chun thit k cu AASHTO LRFD 1998 c th c nhng phn c sa i ng k cp nht cc cng ngh mi, nh cc phn 3, 8, 10, 11, 18, 19, 27. C 3 phn mi thm so vi ln xut bn u tin nm 1998 l cc phn 30, 31 v 32. oBngvitttccnvolngdngchungchocctiuchunLRFDtheonvquct c lit k di y:

TCCS 02:2010/TCBVN 3 n vVit ttn vVit tt mt khim3megapascalMPa ngyngymtmt vung mt khi micron mt, m m2 m3 mm celsius oCmililt milimt ml mm gi giy gi, h giy, s NewtonN hcHzNewton mtNm Joule, JunJNewton/mt ngy N/m ngy Kilmt/giKm/hPascalPa kilonewtonkNPascal second pht Pa.S pht, min kilopascalkParadianrad ltLRadian/giyrad/s 2.Phm vi p dng Tiu chun ny c khuyn co p dng i vi cng tc thi cng v nghim thu cu v cng cho cc cumicktcuthngthngvpdngcccngnghthngthngtrnngt,ng thnh ph.Phm vi p dng ca Tiu chun ny bao gm: oDng ch o thi cng cc cng trnh cu ng b Vit Nam nhm m bo cht lng, an ton v thn thin vi mi trng. oLTiuchunhihoviccTiuchunthitkvthicngthngdngtrnthgiiang c cc d n ODA v giao thng a vo cc Hp ng gia Ch u t v Nh thu, gia Ch u t v T vn gim st Vit Nam qua cc Ch dn k thut trong h s hp ng. oLm c s cho cc Nh thu tham kho lp cc Quy trnh cng ngh c th cho tng hng mc trong cc d n c th Ngoi cc quy nh trong Tiu chunny, trong thi cng v nghim thu cu v cng, cn cn phi tun theoccTiuchunhinhnhkhccaBGTVTvNhncclinquantrongphnccTiu chun vin dn. Tiuchunnykhngcptivickimtra, xemxt ichiuviccthit k cu.Cngtcny cn phi c thc hin theo nhng quy nh chung ca Nh nc v nghim thu cc cng trnh xy dng c bn. TCCS 02:2010/TCBVN 4 3.Ti liu vin dn (xp theo th t ban hnh t cc nm gn y) oTCXDVN364 : 2006Tiu chun k thut o v x l s liu GPS trong Trc a cng trnh" oTCVN 7570: 2006Ct liu cho b tng v va. Yu cu k thuto22TCN 272:2005Tiu chun thit k cu oTCXDVN 309:2004 Cng tc trc a trong cng trnh xy dngoTCXDVN 325:2004 Ph gia ho hc cho b tng oTCXDVN 327:2004 Ktcubtngvbtngctthp-Yucubovchngnmn trong mi trng bin. oTCXDVN 305: 2004 B tng khi ln - Quy phm thi cng v nghim thu o22TCN288-02 Tiu chun dm cu thp v kt cu thp - Yu cu k thut ch to v nghim thu trong cng xng oTCXD VN 262:2001 B tng nng -Phng php xc nh hm lng Clorua trong ct liu v b tng oTCVN 2682:1999 Xi mng pooc lng - Yu cu k thut oTCXDVN 238:1999 Ctliubtng-Phngphphohcxcnhkhnngphnng kim silc oTCXDVN 234:1999 Ni ct thp c g oTCVN 6260:1997Xi mng pooc lng hn hp - Yu cu k thutoTCVN 6067:1995Xi mng pooc lng bn sunpht - Yu cu k thutoTCVN 6069:1995Xi mng pooc lng t to nhit - Yu cuk thutoTCVN 4787:1989Xi-mng Phng php ly mu v chun b mu th oTCVN 338:1988Ct xy dng Phng php xc nh thnh phn khong vt oTCVN 1772:1987, si trong xy dng Phng php th oTCVN4506:1987Nc cho btng v va Yu cu k thut oTCVN 1770:1986Ct xy dng Yu cu k thut oTCVN 1771:1986 dm, si v si dm dng trong xy dng Yu cu k thut oTCVN 1651-1985Thp ct b tng cn nng oAASHTO M203M (ASTM A416M)Taothp7sidnglckhngsnph,ckhng sut cho b tng d ng lc hocoAASHTO M275M (ASTM A722)Thpthanhcngcaokhngsnphdngchob tng d ng lc. PHN 1: O V LP KT CU 1 - 1 - PHN 1: O V LP KT CU MC LC 1.1 TNG QUT 1.2 BN V THI CNG. 1.3 VT LIU... 1.4 THI CNG. 1.4.1 Chiu su mng.. 1.4.2 Chun b mng v khng ch nc.. 1.4.2.1 Tng qut 1.4.2.2 o trong dng nc 1.4.2.3 Mng trn .. 1.4.2.4 Cc mng khc.. 1.4.2.5 Chp thun nn mng.. 1.4.3 Lp t 1.5 O C V THANH TON 1.5.1 o c. 1.5.2 Thanh ton. Ti liu vin dn.. 1-2 1-2 1-3 1-3 1-3 1-3 1-3 1-3 1-4 1-4 1-4 1-4 1-5 1-5 1-5 1-7 PHN 1: O V LP KT CU 1 - 2 - PHN 1 O V LP KT CU 1.1 TNG QUT Cng tc obao gm vic loi b tt c cc loi vt liu, d bn cht th no, cn thit cho vic thi cng mng cu, tng chn v cc kt cu ch yu khc theo h s hp ng hoc theo ch dn ca K s ( trong Tiu chun ny c hiu l K s t vn gim st trng hoc i din ca ng ta). Nu khng c cc quy nh khc trong hp ng, cng tc o phi k c vic cung cp tt c cc thit b cn thit, vic thi cng v sau thu dn tt c cc vy, ct chng v cc h thng khng ch nc cn thit cho vic thi cng cng trnh. Ncngphigmcviclptcnthit, nukhngcquynhnokhc trong h s hp ng, k c vic lu gi cn thit cc loi vt liu o ln c dng lp li v em cc vt liu khng cn thit cho vic lp li, cho nn ng p hoc theo quy nh i vi vt liu tha khng ph hp trong Tiu phn 203.02. Tiu chun hng dn thi cng ng t ca AASHTO. Nu hp ng khng c mt mc thanh ton ring cho cng vic ny th cng tc o phi gm mi vic dn quang, o gc cy v d b cc kt cu hin c trong khu vc phi o. Nu c, vic phn loi cng tc o phi c ch r trn h s hp ng v nu ln trong bn kin ngh. Victhudnvemiccvt liutnhinhocnhntochndit c a vo trong cp loi cng tc o ti ni c cc vt chn vi , tr khi vic thudnvinhvyckvocchngmckhccacngtrnh.Tuy nhin, trong trng hp vt chn vi l nhn to th vic thu dn v i ca cc vt nyscchitrnhcngviclmthmvkhilngnyskhngbaogm trong khi lng o c ca h o nu: vic loibvt cndngnccphngphphocthitbkhng c s dng cho cc cng vic o khc trong n, s tn ti ca vt khng c ch r trn cc bn v trong hp ng, stnticavtcthkhngcxcnhtrongkhosthin trng, k c vic gp phi cc cng trnh tin ch cng cng trong khu vc, nh thu yu cu nh vy bng vn bn trc khi thu dn vt . Chgii:Tiuphn203.02trongTiuchunhngdnthicngngtca AASHTO. 1.2 BN V THI CNG Khi c quy nh trong bn v hp ng, Nh thu phi cung cp cc bn v thi cng, km theo nhng tnh ton thch hp v phng php o, thi cng nn p v cc thao tc lp t. Bn v ny phi cho thy cc chi tit ging, chng, x l mi dc hoc h thng bo v kin ngh s dng khc v phi km theo cc tnh ton thit k PHN 1: O V LP KT CU 1 - 3 - vccsliuxcminhchititchophpxemxtvkthutbnthitk ngh. Cc bn v thi cng bo v chng ln st phi np trc khi s dng c thi gian xemxt, sa li nu cn thit v chp thun khng gy chm tr cho cng vic. Cc bn v thi cng phi c K s chp thun trc khi thc hin cng vic c lin quan v vic chp thun ny khng gim nh cho Nh thu khi bt k trch nhim no trong hp ng hon thnh tt p cng vic. 1.3 VT LIU Vt liu dng lp khng c c cc cc b ng bng, g hoc cht c th b mc rung hoc nguy hi khc v phi c cp phi sao cho t c cht yu cu mt cch thch hp bng cch dng cc phng php m cht do Nh thu la chn. Vtliuthmnclmrnhtiuncngmphiphhpviiu704.01 Tiu chun hng dn thi cng ng t AASHTO nh sau: S dng ct cng bn vsch,sicui,nghinhocxnghinlpho,xyrnhthotncngm hoc cc mc ch thot nc ngmkhc. Bo m vt liu thm nc khng cha cht hu c, cc st hoc cc cht c hi khc. Chgii:Tiuphn704.01trongTiuchunhngdnthicngngtca AASHTO. 1.4 THI CNG 1.4.1 Chiu su b mng Caoybmng,nh chotrnhshpng,chcxemlgn ng vK s c th yu cu bng vn bn v cc s thay i v kch thc hoc cao b mng cn thit m bo mt b mng tho ng. 1.4.2 Chun b mng v khng ch nc 1.4.2.1 Tng qut Tt c cc kt cu phn di, khi c th, phi thi cng trong cc h o h v khi cn thit h o phi ging chng hoc bo v bng cc vy thi cng theo cc yu cu trong iu 3.3 vy v khung chng. Khi mng c th t kh khng s dng vy, c th b cc khung chng vi s chp thun ca K s, ton b h o c y b tng ti cao yu cu camt trn mng. Lng b tng yu cu tng thm phi c cung cp v vi chi ph ca Nh thu. Cc h thng khngchnctmthiphiphhpviccyucutrongiu3.4Hthng khng ch tm thi mc nc. 1.4.2.2 o trong dngnc Khiotrongmtdngknhhocsngsui,trkhicphplmkhc, khng c o pha ngoi cc ging chm, ci, vy, cc thp hoc cc vn, lng sng thin nhin cnh kt cu khngc lmxo trn nu khng c K s cho PHN 1: O V LP KT CU 1 - 4 - php. Nu o hoc no vt ti a im kt cu trc khi h ging chm, ci hoc lm vy kiu dm hoc ti ch, saukhi nn mng lm xong, Nh thu phi lp tt c hotimtttrckhixymnghocysng bngvt liucKs ngvkhngcthmmtkhontinno.Vt liuotmnghoccch o khc c cht tm trong khu vc dng chy ca sng phi thu dn khu vc dng chy khng cn b cn tr. 1.4.2.3 Mng trn Khi mng t trn gc, gc phi khng c t ri rc, sch s v o ti mt mt phng, hoc bng phng, nh bc hoc g gh, theo ch dn ca K s. Cc khe ni phi lm sch v nhi y b tng, va hoc va phun trc khi lm bmng. Khi cn n mn b mng t n cao thit k, tt c cc mnh vn, ri rcbphthphncaochutiphicloibhocthaybngbtnghoc phun va bng tin ca Nh thu. 1.4.2.4 Cc loi mng khc Khi mng nm trn nn o khng phi l , phi c bit lu khng c xo trn y h o v vic loi b cui cng vt liu nn ti cao d kin ch c thc hin ngay trc khi b mng. Khitdiy bmngkhngcccbxotrn,t phivtiv thay bng b tng hoc vt liu c chp thun khc bng tin ca Nh thu. Di ccbmngccc,thtchoquhocbxotrnphicthayvluln theo ch o ca K s. 1.4.2.5 Chp thun nn mng Sau khi o xong, Nh thu phi thng bo cho K sv khng c b tng hoc vt liu mng khc trc khi K s chp thun chiu su h o v c tnh ca nn t. 1.4.3 Lp t t lp phi ph hp vi cc quy nh ca iu 1.3 Vt liu. Nu khng c t c cht lng ph hp ly t h o trong gii hn d n, Nh thu phi ly vt liu t ni khc n theo ch dn ca K s. Tr khi c quy nh khc trong h s hp ng, tt c cc khong khng lp khng b m, tr, hoc cng trnh vnh cu khc chim phi c lp li bng t cho ti b mt ca t xung quanh, vi d tr cho ln. Tr khi c cc quy nh khc, tt c t lp phi lu ln k cng ti cht ca t xung quanh, mt trn ca t phi san gn gng. t lp xung quanh tr phi sao cho c gn cng mt cao cng mt thi im hai bn tr. c kch thc ln hn 75 mm khng c ln trn mt b tng.ThicngnntphiphhpviccyucucaTiuphn203.02 Tiu chun hng dn thi cng ng t ca AASHTO. tlpticctngchn,m,tngcnh,cctrkhungtrongnnng p phi ri thnh tng lp nm ngang khng qu 150 mm, c m ln tt v phi lp lntrnttccc phacaktcuhoccngtrnhmtcchngu.t lp tronghocbndinnngp,bntronglngngtrongcckhuvco, hoc trc cc m v tng chn hoc tng cnh phi lp ti cng mt cht nh yu cu i vi nn ng p. PHN 1: O V LP KT CU 1 - 5 - NuchacKsng,khngclptrnbtcktcubtng no. Vic t lp cng phi theo ng cc yu cu ca iu 8.15.2 Ti trng t. Vic lp t trc m v tng cnh phi lm trc ht phng nga chuyn ng ra pha trc. Khng c php xi nc vo t lp sau m hoc tng cnh. Ticclthotncphibtrthong thothontonnccat lp, phi t cc rnh tiu nc kiu Php gm t nht 0,06m3 vt liu thm nc bc trong cc tm si lc ngn nga b tc hoc lt cc ht mn ca t p ra ngoi. Vic lp cc cng kim loi v b tng phi thc hin theo cc yu cu ca Phn 26 Cng kim loi v 27 Cng b tng. Chgii:Tiuphn203.02trongTiuchunhngdnthicngngtca AASHTO. 1.5 O C V THANH TON 1.5.1 o c Khilngphithanhtonchocngtcoktcuphiotheomtkhi. Khilngthanhtonphixcnhtgiihnchotrnhshpng,hoc theo lnh ca K s. Khng tr trong khi lng thanh ton ca cng tc o khi Nh thu khng o t nm ngoi gii hn ca kt cu thc t nhng nm trong gii hn thanh ton ca cng tc o. Khi khng c cc quy nh khc trong h s hp ng, cc gii hn thanh ton cho cng tc o kt cu c ly nh sau: ccgiihnnmngangslccmtphngthngngcch 450mmphangoinggiihnmpbmnghocmpcakt cu nu khng c b mng, cc gii hn trn mt l mt t trc khi xy mng hoc nh ca mt ct ngang san i theo yu cu, ly gii hn thp hn, v cc gii hn pha di phi l y ca bmng hoc y ca kt cu hoc gii hn thp hn ca h o theo ch th ca K s. KhimngnmtrongnnngpvccTiuchunkthutyucu nn ng p phi thi cng ti cao quy nh cao hn y b mng hoc y kt cu trc khi thi cng mng, th cao quy nh ny c xem l mt t ban u. Khi cn thit, theo kin ca K s, phi a mng xung di cc cao cho trn h s hp ng th 900mm o su thm c tnh trong khi lng c thanh tontheohngmcny.Vicosuthmqusunycthanhtonnh cng vic lm thm, tr khi Nh thu tuyn b bng vn bn rng vic thanh ton theo cc gi hp ng l chp nhn c. 1.5.2 Thanh ton Tr khi c quy nh khc, cng tc o c quy nh trong iu 1.5.1 o c scthanhtontheomtkhiivichttv loioquynhtronghs hp ng. PHN 1: O V LP KT CU 1 - 6 - Vic thanh ton i vi cng tc o kt cu phi bao gm y vic b p cho tt c nhn cng, vt liu, thit b v cc hng mc cn thit khc hoc thun tin cho vic hon thnh tt cng vic o ti cao y b mng hoc kt cu. Phi xt vic b p y cho vic khng ch v tho nc khi cc h o v cho vic cung cp lp t hoc thi cng cc vy, thanh chng v tt c cc thit bkhccnchocc thaotc,trcc lpbtng btycthhintrong hs hp ng, k c vic thu dn chng phi xt n trong gi hp ng i vi cng tc o kt cu, tr khi hp ng quy nh thanh ton ring cho cng tc . Gi hpngchocngtco phibaogmmikhonthanhtonchomi vicxlvctgitodngchovic lp li,kccngvic lmkhcn thit; v vic thanh thi t o ln cn tha hoc khng ph hp. Tr khi c quy nh khc trong hp ng, mi vic dn quang, o gc cy hoc thu dn kt cu cn thit, nu khng thanh ton trong cc hng mc khc ca h s hp ng, s c xt gp vo gi thanh ton cho cng vic o kt cu. Trkhihpngquynhthanhtonring,gihpngchocngtco phi b p y cho vic v m ln t lp. Vic cung cp vt liu lp t cc ngunngoihoscthanhtontheongihpngivivtlius dng, hoc theo cng vic lm thm nu khng lp c n gi. PHN 1: O V LP KT CU 1 - 7 - Ti liu vin dn AASHTO.1998.AASHTOGuideSpecificationsforHighwayConstruction,GSH-8, American Association of State Highway and Transportation Officials, Washington, DC. PHN 2: THO D KT CU HIN C 2 - 1 - PHN 2: THO D KT CU HIN C MC LC 2.1 M T 2.2 BN V THI CNG. 2.3 THI CNG. 2.3.1 Tng qut 2.3.2 Tn dng. 2.3.3 Tho d mt phn kt cu.. 2.3.4 Thu dn cng trng.. 2.4 O C V THANH TON 2-2 2-2 2-2 2-2 2-3 2-3 2-3 2-4 PHN 2: THO D KT CU HIN C 2 - 2 - PHN 2 THO D KT CU HIN C 2.1 M T Cngvicnybaogmvicthodhontonhocmtphn,vthudn cng trng, hoc tn dng tt c cc cu, tng chn v cc kt cu ch yu khc phi tho d c ch nh trong h s thu. Tr khi c quy nh khc, cng vic ny cng bao gm mi vic o v lp cc ho, cc l hoc h o do vic tho d m c. N cn bao gm mi chi ph cho h thng gim st mi trng v sc kho hoc cho cc k hoch khc c th c yu cu. 2.2 BN V THI CNG Bn v thi cng cho bit cc phng php v trnh t tho d: khi cc kt cu hoc cc phn ca kt cu c quy nh phi tho d v tn dng, khi cng tc tho d c thc hin trn hoc lin k ng xe chy hoc ng st, hoc khi c quy nh trong h s hp ng. t nht 10 ngy trc ngy d kin bt u cng vic tho d, cc bn v thi cng phi np cho K s c chp thun. Cng vic tho d khng c bt u trc khi bn v c chp thun. Vic chp thun ny khng gim nh trch nhim ca Nh thu c quy dnh trong h s hp ng cho vic hon thnh tt cng vic. Khi cn tn dng, cc bn v phi ch r rng cc du hiu ra t tn cc phn on ring r ca kt cu. 2.3 THI CNG 2.3.1 Tng qut Tr cc cng trnh tin ch cng cng v cc hng mc khc m K s c th ch th cho Nh thu li mt cch nguyn vn, Nh thu phi san bng, tho d v thanhthimiktcuhocbphnktcucchnhphithod.Ttcb tngvccmngkhcphithodti sut nht600mmdicao mtt hoc900mmdicaolpmtnnng,lycaonothphn. Trkhic cc quy nh khc trong h s hp ng, Nh thu c th hoc nh cc cc hoc ct chng ti im khng t hn 600mm di mt t. Cc l hng li do vic tho d ktcuphilpncaocatxungquanh,nunmtrongkhuvcxydng ng xe chy phi lu ln theo cc yu cu ca h s hp ng p nn ng. Khngcdngthucn,trticcvtrviukinni trongcchs hp ng. Tt c vic n mn phi hon thnh trc khi lm cng trnh mi. PHN 2: THO D KT CU HIN C 2 - 3 - 2.3.2 Tn dng Ccvtliucchnhphitndngtronghshpngdngli trongdnhocchotng lai,phithuc vtisncaChutvphic tho d cn thn thnh tng on c th vn chuyn c v phi ct gi gn cng trngtivtrdoKschnh.Nhthuphikhiphcvthaythvtliuh hng hoc b ph hu m khng c n b thm. Cc inh tn v bu lng phi tho ra khi cc kt cu thp c tn dng, phi thobngcchtyubngmtcic,sauthockhoanrakhil,hoc bng phng php khc m khng lm tn thng n cc cu kin s dng li v c s chp thun ca K s. Trc khi tho tt c cc cu kin hoc on kt cu thp phi nh du ch ni vi nhau bng sn theo s hoc bn v c K s chp thun. Tt c cc bu lng v inh phi tho khi cc tm g c K s coi l c th tn dng c nh mt phn ca cc kt cu g tn dng. 2.3.3 Tho d mt phn kt cu Khiktcuphimrnghocsaivchphithodccphncakt cu hin c, cc phn ny phi tho th no kt cu cn li khng b h hng v trongiukinthchhpsdngtheodnh.Khngcdngccphng php c s dng thuc n hoc n ph trong mt nhp hoc tr tr khi phi tho d ton b nhp hoc tr. Bt k h hng no cho cc phn cn li s dng Nh thu phi sa cha bng tin ca mnh. Trc khi bt u cc thao tc d b tng, gm c vic d mt phn ca mt b phn b tng lin khi, phi ca su khong 25mm theo mt ng chnh xc dc theo cc gii hn tho d trn tt c cc mt ca cu kin m c th nhn thy c khi cng vic hon thnh. Btngccdbcnthntheoccngchnhbngcchkhoan, chocccphngphpkhccKschpthun.Ccmtl radoktqu ca vic ph b phi tng i chnh xc v bng phng, vi cc gc thng, sc nt cho php ni gn gng v kho lo vi cng trnh mi hoc tho mn s dng theo d nh. Ch no c cc thanh ct thp hin c phi ko di t kt cu hin c sang kt cu mi, phi ph b b tng v li cc thanh thp th ra, sch s v khng h hng. Khi cc thanh thp th ra khng ko sang cng trnh mi phi c ct ngang bng vi b mt b tng c. Trong khi d b ton b b dy ca b tng mt cu trn cc dm ngang hoc dc bng thp s c gi li, Nh thu phi ch khng cho cc cnh trn b vt kha, vt khot hoc vn mo. Mi h hng phi do Nh thu sa cha theo ch dn ca K s v bng kinh ph ca mnh. Cc sa cha c th bao gm vic mi, hn, nn thng bng nhit hoc thay th cu kin tu thuc vo v tr v tnh cht nghim trng ca h hng. 2.3.4 Thu dn cng trng Bt k vt liu no khng c ch nh tn dng u thuc v Nh thu. Tr quy nh y, Nh thu phi ct gi hoc loi b cc vt liu ny ngoi hnh lang PHN 2: THO D KT CU HIN C 2 - 4 - ng. Nu vt liu c thi b trn mt khu t t, Nh thu phi c giy php do ngi ch t cp v phi npmt bn sao cami tho thun cho K s. Cc vt liuphthicthvoaimcaChutnuccaimnhvy c ni n trong cc h s hp ng. Tr khi c cc quy nh khc trong h s hp ng, b tng ph b phi em chn trong nn ng k bn, min l b tng phi p thnh mnh c th x l d dng v chn vo trong nn ng p sau khng t hn 900mm bn di cao honthinvmtmidc.Btngph bkhng cchntrongcckhuvc phi ng cc hoc cch cc cy to, ng ng, ct, nh ca, cc cng trnh hoc ktcuvnhcukhctrongvng3000mm,trkhiKschophp.Btngdb cng c th bn ngoi hnh lang ng nh quy nh trn. H s hp ng phi ch r mi vt liu c hi bit, bao gm lai lch sn. Vt liu c hi phi c thanh thi ng cch v c ghi chp ph hp. 2.4 O C V THANH TON Cng vic nh quy nh theo hng mc ny phi c o c cho tng kt cu ring bit, hoc phn kt cu phi d b. Thanh ton c thc hin trn c s gi b thu trn gi i vi vic d b mi kt cu, hoc mt phn ca kt cu nh quy nh trong h s hp ng. Cc gi v thanh ton nu trn phi b p y mi cng vic, nhn cng, dng c, thit b, o, p, vt liu, thanh thi ng n v ph ph cn thit cho vic hon thnh cng vic, k c vt liu tn dng khng s dng li trong d n khi vic tn dng ny c quy nh v khng c thanh ton thm. Vic b p cho vic ph d v tn dng vt liu c s dng li trong d n phi c xem nh gm trong gi hp ng tr cho vic khi phc, xc nh li v tr hoc iu chnh li cc hng mc c lin quan, hoc trong cc hng mc thanh ton khcca hp ngcthcchnhtronghshpng,khngckhonb p no thm cho vic . PHN 3: CNG TRNH TM3 - 1 - PHN 3: CNG TRNH TM MC LC 3.1 TNG QUT... 3.1.1 M t. 3.1.2 Bn v thi cng 3.1.3 Thit k. 3.1.4 Thi cng 3.1.5 Tho d. 3.2 GIO V VN KHUN... 3.2.1 Tng qut. 3.2.2 Thit k v thi cng gio.. 3.2.2.1 Ti trng 3.2.2.2 Mng.. 3.2.2.3 vng. 3.2.2.4 Tnh khng 3.2.2.5 Thi cng. 3.2.3 Thit k v thi cng vn khun. 3.2.3.1 Tng qut.. 3.2.3.2 Thit k.. 3.2.3.3 Thi cng. 3.2.3.4 Khun ng. 3.2.3.5 Cc vn khun li ti ch.. 3.2.4 Tho d gio v vn khun. 3.2.4.1 Tng qut.. 3.2.4.2 Thi gian tho d. 3.2.4.3 Phm vi tho d... 3.3 VY V KHUNG CHNG.. 3.3.1 Tng qut. 3.3.2 Bo v b tng 3.3.3 Tho d. 3.4 H THNG KHNG CH CH TM THI MC NC.. 3.4.1 Tng qut 3.4.2 Bn v thi cng 3.4.3 Thao tc vn hnh.. 3-3 3-3 3-3 3-4 3-4 3-4 3-4 3-4 3-5 3-5 3-5 3-5 3-6 3-6 3-6 3-6 3-7 3-7 3-7 3-8 3-8 3-8 3-8 3-9 3-9 3-9 3-10 3-10 3-10 3-10 3-10 3-10 PHN 3: CNG TRNH TM3 - 2 - 3.5 CU TM. 3.5.1 Tng qut. 3.5.2 Cu trnh.. 3.5.3 Cu cng v. 3.5.4 Bo tr 3.6 O C V THANH TON.. Ti liu vin dn.... 3-11 3-11 3-11 3-11 3-11 3-12 3-13 PHN 3: CNG TRNH TM3 - 3 - PHN 3 CNG TRNH TM 3.1 TNG QUT 3.1.1 M t Cng vic ny gm c vic thi cng v thu dn cc cng trnh tm thng do Nh thu thit k v s dng trong thi cng cng trnh v nu chng khng c thc hin ng n, c th nh hng c hi n tnh cht ca cng trnh hp ng hoc gymtantonchocccngtrnhtinchkbn,btngsnhoccngng.Cc cng trnh tin ch ny bao gm nhng khng gii hn gio, vn khun, vn khun y, vy, khung chng, h vng vy ngn nc v cu tm. Phi gim thch ngccngsutchophp,hssckhnghoccc titrngthitkkhis dng cc vt liu khng phi l mi hoc b h hng. Cc tnh ton phi bao gm vicxcnhccctrngmtctcxtnhhnghoctnthtmtctn chng mc c th. Tr khi cho php khc i, thit k cng trnh tm phi da vo Tiu chun thit k cu AASHTO LRFD vi cc h s ti trng quy inh trong iu 3.4.1 v 3.4.2, phi tnh ton vi mi t hp ti trng c th. Chgii:FHWAbanhnhTvnkthutsT5140.24vongy29/10/1993lin quan n Cng trnh cu tm. B trng B giao thng Hoa K c quc hi ch o binsonTiuchunvhngdndngtrongthicngcutm.Vicspgin gio thi cng cu Maryland ng 198 qua cng vin Baltimore/Washington v thc t l khng c mt quy chun hoc tiu chun quc gia no c sn v cng trnh cu tm dn n vic giao nhim v ny. Cctiuchunhngdn,stayvchngtrnhchngthclcchlin quannphnnycatiuchun.Ccbangcngkhuynkhchxemxtccn phm ny a nhng phnph hp vo tiu chun ca S tayxy dng (xem di) l mt cng c ch dn c ch cho nhn vin kim tra hin trng. Cc n phm di y l cc ti liu tham kho c ch chun b tiu chun thit k, thm tra v gim st cng trnh tm. Tng hp v gin gio, vn khun v bc gin i li cho kt cu cu ng t, Thng 11-1991 (FHWA-RD-91-062). Tiu chun hng dn v cng trnh tm cho cu. Thng 11-1993 (FHWA-RD-93-031). TiuchunhngdnthitkcngtrnhtmchocuThng11-1993 (FHWA-RD-93-032). Chng trnh chng thc v cng trnh tm cho cu Thng 11-1993 (FHWA-RD-93-033). S tay xy dng cng trnh tm v cu Thng 11-1993 (FHWA-RD-93-034) 3.1.2 Bn v thi cng Mikhic quynhhoccyucucaKs,Nhthuphicungcpcc bn v thi cng vi cc tnh ton thit k v cc s liu cn c vi y chi tit cho php xem xt li v kt cu bn thit k kin ngh ca mt cng trnh tm thi. Khi c lin quan n b tng, cc s liu phi gm c trnh t v tc b tng. Phi PHN 3: CNG TRNH TM3 - 4 - cungcp bnsao pngyucucaKsvcccquankhccthm quyn xem xt. Cc bn v thi cng phi np trc ngy s dng d kin khong thi gian cho php xem xt, sa cha li nu thy cn, v chp thun m khng lm chm tr cho cng vic. Nh thu khng c khi cng bt c cng trnh tm no cn n cc bn v thi cng trc khi cc bn v c K s chp thun. Vic chp thun ny khng lm gim nh trch nhim ca Nh thu i vi kt qu t c do vic s dng cc bn v ny hoc bt k trch nhim no khc theo hp ng. 3.1.3 Thit k VicthitkcccngtrnhtmphiphhpviTiuchunthitkcu AASHTO LRFD, hoc phi ph hp vi mt Tiu chun hoc Quy trnh k thut thit k khc c xc lp v c chp nhn ph bin cho cng trnh .. Khi s dng cc cu kin ch sn, thit k khng c t ti ln cc cu kin chsnnyvtqumctitrngdonhsnxutcccukinchsnquy nh.Mctitrngdngchothitbcbit,nhccginphcvlprp,khng trnghpnomctitrngcvtqa80%titrngtiachungc trong khi th nghim ti trng thit b. Khi c quy nh yu cu hoc quy nh trong h s hp ng, bn thit k phi c chun b v cc bn v phi do k s chuyn nghip k tn.Chgii:iu3.1.3quynhvicsdngTiuchunthitkcuAASHTOLRFD hoctiuchunhngdnthitkcngtrnhtmchocu,trkhitiuchun c tha nhn khc c K s chp thun Tiu chun hng dn thit k cng trnh tm cho cu tham kho v ti trng thit k. Bc gin gio tip cn bao hm An ton ngh nghip v Qun tr sc kho (OSHA)cnccgingionnhdnglpktcuthpcthitknhgin gio. 3.1.4 Thi cng Cng trnh tm phi thi cng theo cc bn v thi cng c chp thun. Nh thu phi kim tra cht lng vt liu v cng ngh s dng c ph hp vi gi nh khi thit k khng. 3.1.5 Tho d Tr khi c quy nh khc, tt c cng trnh tm phi c tho d v vn l ti sn ca Nh thu khi s dng xong. Khu vc phi c khi phc v tnh trng ban u hoc theo trng thi d kin v dn sch rc ri, mnh vn. 3.2 GIO V VN KHUN 3.2.1 Tng qutBnvthicnggiophickschuynnghip lpvngdukhi chiu cao gio vt qa 4300mm hoc khi c giao thng di cu, khng k cng nhn qua li di cu ang thi cng.PHN 3: CNG TRNH TM3 - 5 - gio v vn khun phi cng v cng c mi ti trng t ln n mt cch an ton v to ra ng nt v cp kt cu c hon thin theo quynhtronghshpng.Vnkhun cnphigp phn licutrcv nhm b mt theo yu cu v khng lm gim tnh ng u v mu sc ca b mt c to khun. Ch gii: gio c xem l mt kt cu tm thi no cc b phn kt cu bng b tng, thp, gch xy hoc cc vt liu khc trong khi thi cng hoc lp rp. Vn khun c xem l cc vt bao quanh hoc cc tm vn cha b tng lng v chu ng cc lc do v m ln b tng. Cc vn khun c cc gio . Ccxeccdngtrongthicngchngphnonlmtthpcavn khun v gio. 3.2.2 Thit k v thi cng gio 3.2.2.1 Ti trng Titrngtnhtonivigiogmctngcctnhtivhottithng ng v mi ti trng nm ngang. Ti thiu, tnh ti phi bao gm trng lng gio v tt c vt liu thi cng m gio phi chu. Trng lng t hp b tng, ct thp, ct thp ng sut trc v vn khun phi gi nh khng nh hn 2560 kg/m3 i vi b tng thng v 2080 kg/m3 i vi b tng nh. Hot ti gm c trng lng thc t ca bt k thit b no phi nh cc ti trng tp trung ti cc im tip xc v mt ti trng ri u khng nh hn 0,001 MPa tcngtrnkhuvcccngthm1,10N/mmtcngtimpngoica cnh hng mt cu. Ti trng nm ngang dng thit k h ging chng gio l tng s cc ti trngnmngangdothitb,trnhtthicng,gmccclcthutnhkhngcn bngtbtnglng,dngchykhictcdngvtcdngcagi.Tuynhin, khngctrnghpnotitrngnmngangtnhtontheomtphngno c nh hn 2% tng tnh ti. Vi cc kt cu ko sau, gio cng phi c thit k chu c bt k ti trng tng ln hoc phn b li no do vic to ng sut trc cho kt cu. Cctitrngdogiotcngvoktcuhinc,mihocthicng xong mt phn, khng c vt qu cc ti trng cho php trong iu 8.15 t ti. Ch gii: Trong n v quc t, b tng trng lng thng thng c hiu l b tng t trng thng thng v b tng trng lng nh c hiu l b tng t trng nh. 3.2.2.2 Mng gio phi xy dng trn mt b mng chc chn an ton khng b xi di chn, c bo v khng b ho mm v c th chu c ti trng t trn . Khi K s yu cu, Nh thu phi chng minh bng cc th ti thch hp rng cc gi tr chu nncatcginhchovicthitkmnggiokhngvtqukh nng chng ca t. gio no khng th lm trn mt b mng tho ng phi c trn cc, cc phi c b tr, ng v tho d theo cch c chp thun. 3.2.2.3 vng PHN 3: CNG TRNH TM3 - 6 - i vi kt cu b tng c ti ch, vng tnh ton ca cc cu kin chu un ca gio khng c vt 1/240 khu ca chng khng k phn vng c b bng vng ngc to trc. 3.2.2.4 Tnh khng Tr khi c quy nh khc, kch thc ti thiu ca cc khong tnh khng b tr qua cc gio i vi cc ng cn phi m cho giao thng trong khi thi cng phi ln hn b rng ca ng dn n t nht l 1500mm, o gia cc ro chn khi s dng chng. Tnh khng thng ng ti thiu trn quc l v ng cao tc l 4400 mm, trn cc ng khc l 4300 mm. 3.2.2.5 Thi cng gio phi thi cng v b tr dc cho php ln v vng d kin bao gm c trc dc v vng ca kt cu vnh cu c ch r trn h s hp ng hoc theo lnh ca K s. Khi K s ch dn, phi dng cc di vng ngc c chiu cao thay i gia cc dm gio v cc khun y thc hin vic ny. Phi dng cc kch vt thch hp, cc i nm hoc thit b khc ti mi ct : iu chnh dc gio, chophpiuchnhnhtrongkhibtnghoctktcuthpphi quan st ln lch so vi d kin, v xt n vic lng dn ca gio. Nh thu phi b tr o c chnh xc ln gio trong khi v bo dng b tng. gio hoc vn khun bn mt cu trn cc cu kiu dm phi c trc tip trn cc dm chng khng b ln chnh lch ng k trong khi b tng. Cc dm phi ging v neo chng li cc lc c th lm quay hoc xon trong cc dm dobtngmtcuhocccvchnganghocphichothylchocchiu ng ny. Khng c php hn dm cha gio hoc cc thanh ging vo cc cu kin kt cu thp hoc ct thp, tr khi cho php ring. 3.2.3 Thit k v thi cng vn khun 3.2.3.1 Tng qut Vnkhunphibngg,thphocvtliucchpthunkhc,phikn va v c cng phng xon c hi cho mt b tng c to thnh do p lc ca b tng v cc ti trng khc xy ra trong cc thao tc thi cng. Vn khun dng cho cc mt b tng l ra nhn thy c phi to c mt nhnccutrcnguvmusccbngingvimusckhidnggdn chuyndng.Cc tmltccvnkhunnyphibtrsaochoccngnito thnh mt s i xng ph hp vi cc ng nt chung ca kt cu. Phi dng cngmtloivtliultvnkhuntrongsutmibphncaktcu.Ccvn khunphicngchognsngcamtbtngkhngvtqa3mmkhi kim tra bng mt thc thng hoc dng di 1500 mm. Tt c cc gc nhn phi to vt vi cc di vt cnh khong 20 mm. Khng c b tng vo trong vn khun trc khi mi cng vic lin quan n vic thi cng vn khun hon thnh, cc rc ri, mnh vn c dn sch, tt c cc vt liu chn trong b tng c t vo ch i vi khi c v K s kim tra vn khun v vt liu. PHN 3: CNG TRNH TM3 - 7 - Chgii:VnkhuncaktcubtngdnggdnthamkhoTiuchunsn phm PSI G dn xy dng v cng nghip ca Vin tiu chun v cng ngh quc gia. 3.2.3.2 Thit k Vic thit k kt cu vn khun phi ph hp vi Tiu chun ACI K thut thc hnh nn dng i vi vn khun b tng (ACI 347) hoc Tiu chun khc c chp nhn ph bin. Khi la chn p lc thu tnh s dng thit k vn khun, phi xtnnngsutbtng lnnht,tc ngmrung,nhitbtngvmi cht ph gia lm chm ng kt hoc vt liu puzolan d kin s dng trong hn hp b tng. Chgii:ThitkvnkhunthamkhoThchnhkhuyndngvvnkhunb tng ca ACI 347-78. 3.2.3.3 Thi cng Vn khun phi t v gi chnh xc cc kch thc, cc ng nt v cc dc kt cu trc v trong khi b tng. Vn khun c th lm vt hoc g vin ti ccchlinhnhtng,mbodtho.Trckhisdngli,ccvn khun phi sch, kim tra h hng v phi sa cha nu cn. Khi vn khun c biu hin b hng theo mt kiu no , hoc trc hoc trong khi b tng, K s c th ra lnh dng vic cho n khi ch h hng c sa cha. Vn khun phi x l bi trn bng du vn khun hoc cht tho khun khc cchpthuntrckhitctthp.Khngcsdngloivt liudnhvo hoc lm bin mu b tng. Trquynhy,ccthanhginghocneokimloinmbntrongvn khun phi thi cng th no cho php tho chng ti mt su t nht 25mm t mt b tng m khng lm h hi n b tng. Ch c th dng cc thanh ging bng sithpthngthngkhibtngkhngblranhnthycvkhibtng khngtipxcvimuihocsunpht.Ccsithpgingnhvy,khithovn khun, phi ct li vo t nht 6mm k t mt b tng bng c hoc km ct; vi b tng ti phi dng km ct. Cc g lp dng cho thanh ging kim loi phi c thit k sao cho khi tho chng, cc l li phi c kch thc nh nht c th. Cc lnyphinhivaximngvbmtliphitt,nhn,uvmuscng u. Khi yu cu dng ct thp bc epoxy, tt c cc ging, neo hoc tng- kim loi nm li trong b tng phi lm bng loi vt liu chng n mn hoc ph mt cht in mi. Vi cc tng v ct hp, y khun khng th vo c, phi m mt l vo trong vn khun lm sch cc vt liu t bn ngoi vo ngay trc khi b tng. 3.2.3.4 Khun ng Cc ng dng lm khun to ra l rng trong bn b tng phi c thit k v ch to thch hp hoc c x l lm cho mt ngoi khng thm nc. Trc khi btngcc ngnyphicbovchngg,ctgiv lptbngcc PHN 3: CNG TRNH TM3 - 8 - phng php khng gy ra mo m h hi. Cc u ca khun ng phi c np y kn va v khng thm nc. Nu dng g hoc cc vt liu khc n ra khi b m lm np ng. phi dng mt vng m bng cao su c sn dy 6mm xung quanh chu vi np cho php dn n. Phi b tr mt ng thng hi PVC gn mi u ca mi ng. Cc ng ny c lm thot hi tt cho cc l rng. Sau khi d khun ngoi, ng thng hi phi c xn li vo trong mt y b tng hon thnh 15 mm. Ccneovthanhgingchokhunngphingkhngbdchchuyn trong khi b tng. 3.2.3.5 Cc vn khun li ti ch Cc vn khun y mt cu li ti ch, nh bng tn ln sng hoc tm b tng c sn, c th c s dng nu c ch r trong h s hp ng hoc c ch dncaKs.Trckhi dngccvnkhunny,Nhthu phicungcpmtb y cc chi tit cho K s xem xt v chp thun. Tr khi c ghi ch khc, cc h s hp ng i vi kt cu cn dng cc vn khun tho ra c. Mi thay i cn thit ph hp vi cc khun li ti ch, nu c chp thun, phi do Nh thu chu chi ph. 3.2.4 Tho d gio v vn khun 3.2.4.1 Tng qut gio v vn khun khng c tho d nu khng c K s chp thun. Khi xc nh thi gian tho gio v vn khun phi xt ti v tr v tnh cht ca kt cu, thi tit, cc vt liu s dng trong m trn v cc iu kin khc nh hng n cng sm ca b tng. Khng c dng cc phng php tho d c kh nng gy ra ng sut qu cao trong b tng hoc gy h hi b mt b tng. Cc ct phi c tho sao cho kt cu chu ng sut do trng lng bn thn ng u v dn dn. Vi kt cu vm c hai hoc nhiu nhp, trnh t tho gio phi theo nh quy nh hoc chp thun trong h s hp ng. 3.2.4.2 Thi gian tho d Nuccthaotchintrngkhngckimtrabngccthnghim cng b tng theo mu kiu dm hoc mu hnh tr, trc khi tho gio hoc vnkhunphitriquathi gianti thiusauyktngyb tng,khngk cc ngy nhit thp di 50C: gio i vi: Khu trn 4300 mm14 ngy Khu 4300 mm v nh hn10 ngy M tr khung cha dm10 ngy Vn khun: Khng trng lng bn thn b tng:24 gi i vi cc ngn hp bn trong dm hp v i vi lan can:12 gi

NucngcbtngtngnhanhnhdngximngloiIIIhocs dng thm xi mng, cc thi hn trn c th c gim theo ch dn. PHN 3: CNG TRNH TM3 - 9 - Khi cc thao tc hin trng c kim tra bng cc th nghim mu hnh tr: Ch c tho d cc vn khun chu lc hoc gio sau khi thy b tng t cng nn quy nh. Khng trng hp no cc ct c tho d trc 7 ngy sau khi b tng. Vnkhunkhngcthotrckhibtngccngkhng gy ra h hng cho b mt. gio ca cc phn kt cu cng ko sau ch c ni lng sau khi thp d ng lc c cng ko xong. gio mt nhp bt k no ca mt cu lin tc hoc khung cng ch c ni lng sau khi cc yu cu ni trn c tho mn i vi tt c b tng kt cu trong nhp v trong cc phn ln cn ca mi nhp k bn vi mt chiu di bng t nht mt na chiu di ca nhp m gio c ni lng. Tr khi c quy nh hoc chp thun khc trong h s hp ng, gio phi c ni lng trc khi lp lan can, tng nh hoc ro chn cho mi loi cu. Vi cu vm, thi gian ni lng gio so vi thi cng cc b phn ca cu pha trn vm phi c ch ra trn h s hp ng hoc do K s ch dn. 3.2.4.3 Phm vi tho d Tt c gio v vn khun phi c tho d tr:Cc phn ca cc ng lm gio di lp mt nn trn 300mm trong nn ng, hoc 600 mm di mt t ban u hoc cao hon thin ngoi nn ng, hoc 600 mm di cc gii hn xc nh cho lng knh c chy tu. Cc vn khun c b mng m khi tho d chng s lm nguy him cho s an ton ca vy hoc cng trnh khc. Cc vn khun trong cc khoang kn khng c li vo. Cc vn khun mt cu trong cc ngn ca cu dm hp khng cn tr g nviclptcccngtrnhtinchcngcng nutrongcc hs hp ng. 3.3 VY V KHUNG CHNG 3.3.1 Tng qut vy phi c thi cng ti chiu su thch hp m bo n nh v su bt khng cho nc vo. Chng phi c thit k v thi cng an ton, c lm kn nc cn thit thc hin tho ng cng vic phi lm bn trong . Ni chung, cc kch thc bn trong ca vy phi c khong trng thi cng cc vnkhunvkimtraphangoicachngvchophpbmncrangoivn khun. vy b nghing hoc b dch ngang do qu trnh h phi nn thngv dch li,hoclmrngthmtorakhongtrngcnthit.TinchiphdoNhthu chu. Nhthuphikhngchncchyvosaochobtngbmngcththi cng kh. Nh thu phi xc nh c cn lp bt y khng, nu cn th phi xc dnh PHN 3: CNG TRNH TM3 - 10 - chiu dy ca lp bt y v thi gian bo dng cn thit v phi chu trch nhim hontonvchtlngbty.Saukhilpbtcbodng,vyphi c bm nc ra v phn b tng cn li c thi cng kh. Khi dng vy trng lcvtrng lngcdngchngli mtphnplcthutnhtcngvo y lp bt mng, phi b tr neo c bit nh cht hoc kho truyn ton b trng lng vy trong lp bt mng. Trong khi v bo dng lp bt mng, phi kim tra cao nc bn trong vng vy phng nga mi dng chy qua lp bt, nu vy c gi li ti ch, n phi c l thot nc di mc nc thp. Khung chng phi chu c tt c cc ti trng t vo v phi tun th mi quy tc an ton cn p dng. Ch gii:Cc vy v khung chng gm cc kt cu dng gi t tm thi xung quanhvncngoicchovbovtisnhoccccngtrnhlink trong khi thi cng cng trnh vnh cu. Lp b tng bt y ph hp vi yu cu Phn 8 Kt cu b tng phi c di nc di cao mng. 3.3.2 Bo v b tng Cc vy c thi cng bo v b tng ti khi b h hi do dng nc dnglntngtvphngngamngbhhngdoxi.Khngcdngcc thanh chng hoc thanh ging hoc cc h chng trong vng vy m vo trong hoc xuyn qua cng trnh chnh m khng c K s cho php bng vn bn. 3.3.3 Tho d Tr khi c quy nh hoc chp thun khc, cc v h chng vi tt c cc cc vn v thanh chng phi tho d sau khi hon thnh kt cu phn di, phi ch khng lm ri hoc h hi cng trnh hon thnh. 3.4H THNG KHNG CH TM THI MC NC 3.4.1 Tng qut H thng khng ch tm thi mc nc gm c , knh i dng, mng nc v cc cng trnh lm trch dng nc mt khc, h thng tng chn nc v bm, k c h thng ging su v b lc ng kim, dng ngn nc vo trong cc h o cho kt cu. 3.4.2 Bn v thi cng Cc bn v thi cng ca h thng khng ch tm thi mc nc khi cn thit phi bao gm cc chi tit thit k v thit b, phng thc thao tc vn hnh, v v tr im hoc cc im thot nc. Thit k v vn hnh phi ph hp vi tt c cc yu cu kim tra vic nhim bn v xi l ca nc. 3.4.3 Thao tc vn hnh PHN 3: CNG TRNH TM3 - 11 - Vic ht nc ra khi khung vy mng phi loi tr kh nng nc chy qua b tng mi . Khng c ht nc trong khi b tng hoc trong thi gian t nht 24 gi sau , tr khi bm tmt h thch hp tch ring vi cngtrnh b tng bng tng kn nc hoc phng php hu hiu khc c K schp thun. Ch c ht cn ncmt vy bt y sau khi lp bt y cng chu c p lc thy tnh. Bm t cc b lc ng kim hoc cc ging su phi iu chnh trnh lm h hi cho ti sn tip gip do ln st. 3.5CU TM 3.5.1 Tng qut Cc cu tm phi thi cng, bo tr v tho d sao cho khng lm nguy hi cho cng trnh v dn chng. . Ghi ch: Cu tm bao gm cc cu i trnh dng cho giao thng cng cng, cu cng v v cc kt cu khc nh cc cu bng ti do nh thu s dng. 3.5.2 Cu trnh Khi c Ch u t cung cp thit k, cu trnh phi thi cng v bo tr theo ng thit k hoc mt phng n thit k khc c chp thun. Khi cc yu cu k thut cho php, Nh thu c th np mt phng n thit k kin ngh. Mi phng n thit k khc phi tng ng v mi mt vi bn thit k v cc s liu do Ch u t cp v phi c K s chp thun. Cc bn v thi cng v cc bn tnh ton cho mi phng n thit k phi do k s chuyn nghip k tn. Khi thit k khng c Ch u t cp, Nh thu phi lp bn thit k v cung cp cc bn v thi cng cho K s xin chp thun. Bn thit k phi cung cp cc khongtnhkhng,tuyn,khnngchutivccthngstnhtonkhcquy nh hoc c chp thun trong h s hp ng. Bn thit k phi ph hp vi Tiu chun thit k cu AASHTO LRFD. Nu khng c quy nh no khc v hot ti thit k, phi dng 75% ca ti trng HL-93. Cc bn v thi cng v cc tnh ton thit k phi dok s chuyn nghip k tn. 3.5.3 Cu cng v Khi kin ngh lm mt cu cng v hoc cc cu khc cho thi cng khng dng chocngcngvtbntrnmthnhlangngchogiaothngcngcnghoc mtngst,phinpchoKschpthunccbnvthicngvithitk honchnhvccchititbaogmctitrng lnnhtphichu.Ccbnvny phi dok s chuyn nghip k tn. Bn thit k phi ph hp vi Tiu chun thit k cu AASHTO LRFD khi c th hoc cc Tiu chun thch hp khc. Chgii:ThitkcucngvthamkhoTiuchunthicngcuAASHTOLRFD 2004. PHN 3: CNG TRNH TM3 - 12 - 3.5.4 Bo tr Vic bo tr cc cu tm i hi phi c cc bn v thi cng, phi bao gm c victhaythchngtrongtrnghpbhhngmtphnhoctonb.Trong trng hp Nh thu b chm tr hoc tin hnh khng tho ng vic sa cha hoc thay th, Ch u t c quyn cung cp nhn lc, vt liu v gim st cng trnh khi cn khi phc kt cu cho giao thng cng cng c m bo. Ton b chi ph ca vic khi phc v sa cha nycxem lmt phn ca chi ph cho kt cu tm. Khi Ch u t chi cc khon tin , Nh thu phi gnh chu. 3.6O C V THANH TON Tr khi c quy nh khc trong h s hp ng, vic thanh ton cho cng trnh tmcxemlkvotinthanhton chocchngmckhcnhaucacng trnh m chng c dng v khng c thanh ton ring.Khi trong bn danh mc hp ng c k n hng mc b tng bit y cho vy, b tng ny c o c v thanh ton nh quy nh trong Phn 8 Kt cu b tng. Khimthngmchocnhiuhngmccacutm,vykhungchng hoc h khng ch mc nc tnh n trong hng mc b thu, vic thanh ton s l s tin trn gi b thu cho mi kt cu hoc h thng c lit k trong danh mc b thu v c thi cng v tho d theo ng cc yu cu ca h s hp ng. Vic thanh ton ny bao gm vic n b y cho tt c mi chi ph lin quan n vic cung cp mi vt liu, thi cng, bo tr v tho d cng trnh tm . PHN 3: CNG TRNH TM3 - 13 - Ti liu vin dn AASHTO.1995.ConstructionHandbookforBridgeTemporaryWorks,CHBTW-1, American Association of State Highway and Transportation Officials, Washington, DC. AASHTO.1995.GuideDesighSpecificationforBridgeTemporary,FSBTW-1, American Association of State Highway and Transportation Officials, Washington, DC. AASHTO. 2004. AASHTO LRFD Bridge Desigh Specifications, 3rd Edition, LRFDUS-3 orLRFDSI-3,AmericanAssociationofStateHighwayandTransportationOfficials, Washington, DC. Available in customary U.S. units or SI units. ACI.1978.RecommendedPracticeforConcreteFramework,AmericanConcrete Institute, Farmington Hills, MI. FHWA.1991.SynthesisofFalsework,Formwork,andScaffoldingforHighwayBridge Structures,FHWA-RD-91-062,FederalHighwayAdministration,U.S.Departmentof Transportation, Washington, DC, Nov. 1991. FHWA.1993.BridgeTemporary Works, TS140.24,FederalHighwayAdministration, U.S, Department of Transportation, Washington, DC, Oct. 1993. FHWA.1993. Guide Standard Specifications for Bridge Temporary Works, FHWA-RD-93-031,FederalHighwayAdministration,U.S.DepartmentofTransportation, Washington, DC, Nov. 1993. FHWA.1993. Guide Design Specifications for Bridge Temporary Works, FHWA-RD-93-032, Federal Highway Administration, U.S. Department of Transportation, Washington, DC, Nov,. 1993. See also AASHTO GSBTW-1, listed above. FHWA.1993.CertificationProgramforBridgetemporaryWorks,FHWA-RD-93-033, Federal Highway Administration, U.S. Department of Transportation, Washington, DC, Nov. 1993. FHWA.1993.ConstructionHandbookforBridgeTemporaryWorks,FHWA-RD-93-034, Federal Highway Administration, U.S. Department of Transportation, Washington, DC, Nov. 1993. See also AASHTO CHBTW-1, listed above. NIST.1995. Construction and Industrial Plywood, Voluntary Product Standard PS 1-95, NationalInstituteofStandardsandTechnology,U.S.DepartmentofCommerce, Gaithersburg, MD. PHN 4: MNG CC NG4 - 1 - PHN 4: MNG CC NG MC LC 4.1 M T 4.2 VT LIU... 4.2.1 Cc thp. 4.2.1.1 Sn.. 4.2.2 Cc g. 4.2.3 Cc b tng 4.3 CH TO CC. 4.3.1 Cc b tng c sn. 4.3.1.1 Vn khun... 4.3.1.2 b tng.. 4.3.1.3 Hon thin... 4.3.1.4 Bo dng v bo v 4.3.1.5 To ng sut trc 4.3.1.5.1 Bn v thi cng... 4.3.1.6 Ct gi v bc xp 4.3.2 Cc b tng c ti ch 4.3.2.1 Kim tra ng vch.. 4.3.2.2 b tng.. 4.4 NG CC... 4.4.1 Thit b ng cc... 4.4.1.1 Ba... 4.4.1.1.1 Tng qut. 4.4.1.1.2 Ba ri t do 4.4.1.1.3 Ba hi nc kh nn. 4.4.1.1.4 Ba iden.. 4.4.1.1.5 Ba rung.. 4.4.1.1.6 Thit b hoc cc phng php ph thm.. 4.4.1.2 Cc ph tng ng cc. 4.4.1.2.1 m ba.. 4.4.1.2.2 u truyn ng. 4.4.1.2.3 m cc... 4.4.1.2.4 Gi ba. 4.4.1.2.5 Cc dn 4-3 4-3 4-3 4-3 4-3 4-4 4-4 4-4 4-4 4-4 4-4 4-5 4-5 4-5 4-5 4-5 4-5 4-6 4-6 4-6 4-7 4-7 4-7 4-8 4-8 4-8 4-8 4-8 4-8 4-9 4-9 4-9 4-9 PHN 4: MNG CC NG4 - 2 - 4.4.1.2.6 Xi nc.. 4.4.2 Chun b ng 4.4.2.1 Cng vic cng trng. 4.4.2.1.1 o 4.4.2.1.2 Khoan trc ng cc c d dng 4.4.2.1.3 Cc l khoan trc trong nn ng p.. 4.4.2.2 Chun b cc.. 4.4.2.2.1 ai cc. 4.4.2.2.2 Lm nhn u. 4.4.2.2.3 Thp bt mi cc v vu cc. 4.4.3 ng cc. 4.4.3.1 ng cc th.. 4.4.3.2 chnh xc ng cc. 4.4.4 Xc nh kh nng chu lc. 4.4.4.1 Tng qut 4.4.4.2 Phng php A Cng thc cc kinh nghim. 4.4.4.3 Phng php B Phn tch phng trnh sng........................ 4.4.4.4 Phng php C - Th nghim ti trng ng............................ 4.4.4.5 Phng php D - Th nghim ti trng tnh.............................. 4.4.5 Ni cc 4.4.5.1 Cc thp.. 4.4.5.2 Cc b tng. 4.4.5.3 Cc g. 4.4.6 Cc h hng.. 4.4.7 Ct cc 4.4.7.1 Tng qut 4.4.7.2 Cc g. 4.5 O C V THANH TON 4.5.1 Phng php o c 4.5.1.1 Cc g, thp v b tng 4.5.1.1.1 Cc cp.. 4.5.1.1.2 Cc ng 4.5.1.2 Mi ni cc, chp bt mi cc v vu cc.. 4.5.1.3 Th ti trng... 4.5.2 C s thanh ton.. Ti liu vin dn.. 4-9 4-10 4-10 4-10 4-10 4-10 4-10 4-11 4-11 4-11 4-11 4-11 4-12 4-12 4-12 4-12 4-13 4-13 4-14 4-15 4-15 4-15 4-15 4-16 4-16 4-16 4-16 4-17 4-17 4-17 4-17 4-17 4-17 4-17 4-18 4-19 PHN 4: MNG CC NG4 - 3 - PHN 4 MNG CC NG 4.1 M T Cng vic ny bao gm vic cung cp v ng cc cc mng thuc chng loi vkchthcchnhtronghshpng,kcvicctucchocthicng mng cc khi yu cu. Quy nh cng bao hm c vic cung cp cc cc th nghim vtinhnhccthnghimtitrng.CcphiphhpvclpttheoTiu chun ny ng v tr, ng cao , chiu su ng cc v kh nng chu lc cho trn h s hp ng theo ch dn ca K s. Tr khi c yu cu th cc, Nh thu phi cung cp cc cc theo ng cc kch thc cho trong h s hp ng. Khi cn th cc, chiu di cc cho trong h s hp ng ch l c tnh, chiu di thc t cung cp sn xut cc s c K s xc nh sau khi ng cc cc th. Cc chiu di cho trong danh mc t hng ca K s ch gm cc chiu di d tnh dng trong kt cu hon thnh. Nh thu phi tng thm chiu di cho hoc b tng ti ch ni di u cc tng thm chiu dicnthitphhpviphngphpngcccamnhmkhngcnb thm. 4.2 VT LIU 4.2.1 Cc thp Thp kt cu dng trong cc mng phi ph hp vi Tiu chun AASHTO M 270M/M270(ASTMA709/A709M)cp36,50hoc50W(cp250,345hoc 345W) hoc ASTM A690/A 690M. 4.2.1.1 Sn Tr khi c quy nh khc, khi cc thp hoc cc ng vch thp ko di ln trn mt t hoc mt nc, chng phi c bo v bng cc loi sn quy nh cho vic snthpmitrongmitrngnhimcaohocvngbbinnhquynhtrong Phn 13 Sn. Vic bo v ny phi lm t cao 600mm di mt nc hoc mt t ti nh ca thp l ra. 4.2.2 Cc g Cc g phi ph hp vi cc yu cu ca AASHTOM 168. Cc g phi c x l hoc khng x l theo ch dn trong h s hp ng. X l bo qun phi ph hp vi cc yu cu ca Phn 17 X l bo qun g. Phng php ct gi v bc xp phi sao cho khng gy h hi cho cc. Phi c bit ch trnh lm v nt bmt cc x l. Khng c s dng ccmc PHN 4: MNG CC NG4 - 4 - xin, ngom hoc thanh xin. Cc ch ct hoc ch v, nt trn b mt cc x l hoc l bu lng phi x l theo quy nh trong iu 16.3.3 G x l. 4.2.3 Cc b tng Cc b tng gm cc b tng c sn hoc cc b tng c ti ch trong ng vch thp. B tng xi mng Porland phi ph hp vi cc yu cu trong Phn 8 Kt cu b tng, tr khi trong h s hp ng quy nh mt loi khc, b tng phi l loi A. Ct thp phi ph hp vi cc yu cu ca Phn 9 Ct Thp v vic to ng sut trc phi ph hp vi yu cu ca Phn 10 To ng sut trc. Cc ng vch thp dng lm cc b tng c ti ch phi c b dy khng nh hn b dy cho trong h s hp ng. Nh thu phi cung cp cc ng vch c b dy ln hn nu cn thit c cng v cng cho php ph hp vi thit b chn dng m khng lm h hi, v phng nga b vn do p lc t hoc do ng cc cc ln cn. Cc thit k ng vch khc phi c chp thun trc bt k ln h cc no. Cc ng vch cng phi kn nc loi tr nc trong khi b tng. Cc ng vch c th c hnh tr trn hoc cn, hnh cn nhiu bc hoc kt hp c hai vi cc on hnh tr trn. 4.3 CH TO CC 4.3.1 Cc b tng c sn 4.3.1.1 Vn khun Vnkhunchocc btngcsnphiphhpviccyucuchung i vicngtcvnkhunbtngtheoquynhtrongPhn3Cngtrnhtm.Cc khun phi b tr ch a my vo rung v san m b tng. 4.3.1.2 b tng Vic vn chuyn v b tng phi ph hp vi cc yu cu ca Phn 8 Kt cu b tng v cc quy nh ny. Phi c bit ch b tng sao cho to c linktthongvictthpvtrnhvictothnhccti,tonghoccc khuyt tt khc. m bo ng u, b tng trong mi cc phi lin tc v phi m cht bng cch rung hoc bng cch khc m K s c th chp thun. Vn khun phi ytrn,btngthaphigti,mttrnchonthinvimtktcung u, bng phng tng t nh c to thnh bi vn khun. 4.3.1.3 Hon thin PHN 4: MNG CC NG4 - 5 - Cc phn cc l ra nhn thy c phi c hon thin theo cc quy nh v vichonthinctbtng.Phncckhckhngphihonthin,trphnni trn y. 4.3.1.4 Bo dng v bo v Cc b tng phi bo dng theo quy nh trong Phn 8 Kt cu b tng v ccquynhhny.Ngaykhicccng,trnhhhngchngcthokhi khun v xp trong mt chng cc bo dng ngn cch vi nhau bng cc khi g k. Khng c ng cc trc khi b tng cc c t nht 21 ngy tui sau khi c,trongthititlnhphiluhnnatheoquynhcaks.Ccbtng dng trong nc bin hoc t sunphat phi c bo dng khng t hn 30 ngy trckhicsdng.Btngphicbovkhngbngbngchotikhi cng nn t t nht 0,8 c. 4.3.1.5 To ng sut trc Victongsuttrcchoccbtngphiphhpviccquynhca Phn 10 To ng sut trc. 4.3.1.5.1 Bn v thi cng Nh thu phi trnh hai b bn v thi cng cc b tng ng sut trc cho K s ti cng trng. Cc bn v ny ghi r kch thc cc, vt liu, phng php to ng sut trc, cch b tr b cp v cc lc to ng sut trc c kin ngh s dng v mi ct thp b tr thm hoc b tr li so vi h s hp ng. Vic thi cng cc ch c bt u sau khi cc bn v c K s chp thun. 4.3.1.6 Ct gi v bc xp Vic tho vn khun, bo dng, ct gi, vn chuyn v cu lp cc b tng ct thp c sn phi thc hin theo cch no trnh cc ng sut un qa mc, nt v, tch lp hoc cc hu qu lm h hi khc. Phi p dng cc yu cu thit k trong iu 5.13.4 ca Tiu chun thit k cu AASHTO LRFD. Ccccdngtrongncbinhoctrongtsunfatphiccusaocho trnh b mt b mi mn hoc cc tn thng khc l b tng bn trong. Chgii:Ccyucuthitkctgivculpxemiu5.13.4Ccb tng trong Tiu chun thit k cu AASHTO LRFD. 4.3.2 Cc b tng c ti ch 4.3.2.1 Kim tra ng vch PHN 4: MNG CC NG4 - 6 - mi thi im trc khi b tng trong ng vch, Nh thu phi chun b nh sng kim tra mi ng vch trn sut chiu di ca chng. 4.3.2.2 b tng Chcbtngsaukhivichttc ccngvchtrongvngbnknh4500 mm ca cc hon thnh, hoc cng tc h ng vch trong phm v trn phi dng cho ti khi b tng trong cc cui cng c c t nht 5 ngy. B tng trong cc cc c ti ch phi cht ch v ng nht. Thay cho cc quy nhlinquannvicrungbtngnhquynhtrongiu8.7.4mchtb tng, vic rung hoc xc b tng i vi cc cc c ti ch ch yu cu ti sau 1500 mm di mt t. Btngchomiccphitheomtthaotclintcduynhtvi dngb tnghngxungdivvotmccmbtngbngvap.Nctcht trong ng vch phi c ht httrc khi b tng. Sau khi b tng cng, b mttrncngphiccti loibsaximngvlctliuranhquy nh trong Iu 8.8 Mi ni thi cng. 4.4 NG CC 4.4.1 Thit b ng cc Khng c s dng thit b ng cc lm h hi n cc. Tt c thit b ng cc, bao gm ba ng cc, m ba, u dn, m cc v cc ph tng khc m Nh thu cung cp phi c K s chp thun trc khi ng cc. c chp thun, t nht hai tun trc khi ng cc Nh thu phi np bn m t thit b ng cc cho K s. Mtkhikhnngchulccacccquynhphixcnhtheoiu 4.4.4.3PhngphpB-phntchphngtrnhsng,Nhthucnphinpcc bn tnh da trn phn tch phng trnh sng, chng minh rng cc c th ng vi lc hp l ti chiu di nh m khng b h hi. Phi s dng cc h s c ch ca ba sau y trong phn tch phng trnh sng: Loi baH s c ch theo % Ba n ng kh nn/ hi nc Ba song ng kh nn/ hi nc Ba iden 67 50 72 NgoiccquyinhkhccaTiuchunny,cctiuchmKsdng nh gi thit b ng cc gm c s nht ba cn thit cho mi 300 mm v ng sut cc tng ng vikh nng chu ti cc hn yu cu ca cc. S nht ba cn thit PHN 4: MNG CC NG4 - 7 - theotnhtontngngvikhnngchuticchnyucuphigia 36v 120 cho mi 300 mm l c th chp nhn c i vi thit b ng cc. Ngoi ra, thit b ng cc c th chp nhn c, ng sut cc tnh ton do thit b ng cc sinh ra khng c vt qu cc gi tr di y: i vi cc thp, ng sut nn do ng cc khng vt qu 90% gii hn chy ca vt liu cc. i vi cc b tng, cc ng sut ko khng c vt qu 0,25 nhn vi cnbchaicacngnncabtng ctheoMPa,cngvigitr ng sut trc hu hiu, tc 0,25c + ng sut trc, cc ng sut nn khng c vt 85 % cng nn tr i gi tr ng sut trc hu hiu, tc l (0,85c ng sut trc). iviccg,ngsutnndongcckhngcvtqu3ln cng thit k tnh cho php trong h s hp ng. Cc chun s ny dng nh gi cc kt qu tnh ton xc nh kh nng c th chp thun c ca thit b ng cc do Nh thu kin ngh. Trongccthaotcngcc,Nhthuphisdnghthng cchp thun. Bt k thay i no trong h thng ng cc ch c xem xt sau khi Nh thu np cc s liu tnh ton thit b ng cc c sa i. Nh thu s c thng bo v s chp thun hay bc b cc thay i h thng ng cc trong vng 7 ngy k t lc K s nhn c yu cu thay i. Thi gian cn thit np, xem xt li, v chp thun mt h thng ng cc c sa i khng c to thnh c s cho nh thu ko di hp ng. VicchpthunthitbngcckhnglmgimtrchnhimcaNhthu trong vic ng cc, khng h hng ti kh nng chu nn v cao mi cc cho trong h s hp ng. 4.4.1.1 Ba 4.4.1.1.1 Tng qutCccthngbngba ritdo,bakhnn/hinc,hoc baiden ph hp vi cc quy nh ny. Ccba ngcc,ngoibaritdo,phickchccnthitcc nng lng ng cc vi chi khng nh hn 2,5mm mi nht gi tr chu ti yu cu. 4.4.1.1.2 Ba ri t do Ba ri (trng lc) khng c dng cho cc cc b tng hoc cc cc c kh nng chu ti tnh ton vt qu 30 tn (267000N). Khi cho php dng ba ri t do, trnglngbakhngcnhhn900kgvchiucaorikhngvtqu 4500mm. Trong mi trng hp, trng lng u ba ca ba trng lc khng c nhhntng trng lngcamngv cc.Ttcccbatrng lcphi c PHN 4: MNG CC NG4 - 8 - trang b cc thanh dn ba m bo lc va p tp trung vo u ng hoc m cc. 4.4.1.1.3 Ba hi nc kh nn Trng lng phn va p ca cc ba kh nn/hi nc c s dng khng cnhhn1/3trnglngccvmng,trongmitrnghptrnglng phn va p khng c nh hn 1250 kg. Xng v thit b cung cp cho ba kh nn/hi nc phi c nng lc duy tr, trong cc iu kin lm vic, p lc ti ba do nh sn xut quy nh. 4.4.1.1.4 Ba iden Baidenuhnngphitrangbmtdngcchophpksxc nhsvapcabatimithiimtrongkhingcc.Baidenukn (song ng) phi trang b mt ng h o p lc bung ny, lm vic tt, lp gn mt t k s d dng c c. Nh thu phi cung cp mt th tng quan gia p lc bung ny v nng lng ba cung cp. 4.4.1.1.5 Ba rung Ch c th s dng phng php rung hoc cc phng php ng cc khc khi c quy nh trong h s hp ng hoc bng vn bn ca K s. Tr khi chiu di cc c xc nh t cc cc th ti, kh nng chu lc ca cc ng bng ba rung phi c kim tra bng cch ng li cc u tin ng trong mi nhm 10 cc bng mt ba va p c nng lng ph hp o kh nng ca cc trc khi ng cc cc cn li trong nhm. 4.4.1.1.6 Thit b hoc cc phng php ph thm Trongtrnghpsuhccyucukhngtc bngvicsdng mt ba tun th cc yu cu ti thiu trn y, Nh thu c th phi cung cp mt ba c nng lng ln hn hoc khi cho php cn dng cc phng php ph thm nh xi nc hoc khoan trc. 4.4.1.2 Cc ph tng ng cc 4.4.1.2.1 m ba Tt c thit b ng cc kiu va p tr ba trng lc phi c trang b m ba vi vt liu m c b dy thch hp ngn nga h hi ba hoc cc v m bo tc ng ng cc ng u. m ba phi lm bng cc vt liu bn, c ch togiccctnhchtngu trongkhing.Khngcsdngccm ba bng g, cp thp v aming. Phi t mt tm va p trn m ba m bo nn ng u vt liu m. m ba phi c kim tra vi s c mt ca K s khi bt u ng cc v sau mi 100 gi ng cc. m ba phi c Nh thu thay th trc khi cho php tip tc ng cc khi b dy m ba b gim qu 25% b dy ban u. PHN 4: MNG CC NG4 - 9 - 4.4.1.2.2 u truyn ng Cc cc ng vi ba va p phi lp khp vi mt u truyn ng thch hp phn phi nht ba vo u cc. u truyn ng phi c tm thng hng vi tm ba v cc. u truyn ng phi c dn hng bng cc gi ba, khng c lc tdo.utruynngphikhtvixungquanhuccsaochongnngac vic truyn cc lc xon trong khi ng trong lc gi cho ba v cc ng thng hng. Vi cc thp v g, cc u cc phi ct vung v b tr mt u truyn ng gi cho trc dc ca cc thng hng vi trc ba. i vi cc b tng v b tng ng sut trc c sn, u cc phi phng v vung gc vi trc dc ca cc phng nga tc ng lch tm t u truyn ng. Viccloicccbit,phibtrccutruynngthchhp,cccn dn hoc cc dng c khc cc cc c th ng khng b h hi. 4.4.1.2.3 m cc Cc u cc b tng phi c bo v bng mt tm m cc khi tnh cht ca vic ng cc s lm cc h hng qu mc. Khi s dng g dn, b dy ti thiu t trnucctrckhingkhngcnhhn100mm.Phibtrmttmm ccminutrongkhingmbnnqumtnabdybanuhocbtu chy.Cckchthcmbaphiphnphinht batrn ton btitdin ngang ca cc. 4.4.1.2.4 Gi ba Phi dng gi ba ng cc cc v ba trong cc v tr ng n trong sut thao tc ng cc. Thanh dn phi thi cng theo cch cho php ba t do chuyn ngtrongkhigithnghnggiabav ccmbotcngngtmca mi nht ba. Gi ba phi di khng cn dng cc dn v phi thit k sao cho thng hng vi cc cc xin. 4.4.1.2.5 Cc dn Ch c s dng cc dn khi c K s chp thun bng vn bn hoc khi quy nh trong h s hp ng. Khi cho php dng cc dn, kim tra su h cc sao cho l pht trin kh nng chu lc mong mun ca cc, th cc th nht trong mi tr cu v c mi cc th 10 ng sau phi c lm di v phi ngtonbchiudikhngcccdn.Ccdnvccphicgivduytr thng hng trong khi ng. Cc dn phi bng vt liu v kch thc sao cho cc cc c th c ng ti chiu di c xc nh l cn thit trn c s ng cc cc c chiu di. V tr v tim dc cui cng ca hai cc u tin c ng vi cc dn trongmtbmngphickimtraxemcngccdungsaivvtrquynh trong iu 4.4.3 ng cc trc khi tip tc ng. 4.4.1.2.6 Xi nc Ch c php xi nc nu c quy nh trong h s hp ng hoc K s chp thun bng vn bn. Khi khng cn xi nc nhng c chp thun sau khi c yucucaNhthu,Nhthuphixcnhslngtiaxi,thtchvplc nc cn thit ti vi phun xi d dng t tip gip vi cc m khng lm nh PHN 4: MNG CC NG4 - 10 - hng n n nh bn ca cc v tr cui cng. Nh thu phi chu trch nhim v mi h hng ti ch do cc thao tc xi gy ra. Khi trong h s hp ng c quy nh xi nc, thit b xi nc phi c nng lng cung cp vo mi lc mt p lc tng ng vi t nht 0,7 MPa ti hai vi phun 20mm. Trongchaitrnghp,trkhicquynhkhccaKs,ccngphun phi d i khi mi cc trn cao mi quy nh t nht 1500mm v cc phi ng ti kh nng chu lc cn thit bng mt ba va p. Nh thu cng phi kim tra, x l nu cn thit, v b tr tt c nc phun nhm tho mn K s. 4.4.2 Chun b ng cc 4.4.2.1 Cng vic cng trng 4.4.2.1.1 o Ni chung cc chi c ng sau khi t o xong. Mi vt liu chn gia cc cc phi c ly i ti cao chnh xc trc khi b tng mng. 4.4.2.1.2 Khoan trc ng cc c d dng Khi c quy nh trong h s hp ng, Nh thu phi khoan trc cc l ti v tr cc ti cc chiu su cho trong h s hp ng hoc c K s cho php. Cc l khoan trc phi nh hn ng knh hoc ng cho ca tit din ngang cc v cho php cc thm nhp ti chiu su quy nh. Nu c tr ngi di mt t, nh c cc tng hoc gp cc lp , ng knh l c th tng ti kch thc nh nht lp cc. Mi khong rng cn li sau khi ng cc xong phi lp y ct hoc vt liu khc c chp thun. Vic s dng thun khng c php thay cho vic khoan trc, tr khi c quy nh trong h s hp ng hoc c php bng vn bn ca K s. Vt liu t cc l khoan phi dn i theo chp thun ca K s. Ch gii: Thun l mt thanh cng, ngn ng xung ri rt ln to thnh l t cc vo. 4.4.2.1.3 Cc l khoan trc trong nn ng p Cc cc phi ng qua nn ng mi p phi ng trong cc l khoan sn hoclthunquannngpkhichiusucannngpvtqu 1500mm.Lphicngknhkhngnhhnkchthclnnhtcatitdin ngang cc cng 150mm. Sau khi ng cc, khong trng xung quanh cc phi nhi bng ct kh hoc si ht u ti mt t. t ly t cc l khoan phi dn i theo s chp thun ca K s. 4.4.2.2 Chun b cc Ngoi vic lm vung vn u cc trc khi ng, cc phi chun b thm ng theo quy nh sau y. PHN 4: MNG CC NG4 - 11 - 4.4.2.2.1 ai cc Khi cn ng cc g c sc chu hn 310.000N hoc khi iu kin ng c yu cu khc, phi b tr cc ai, di hoc dng c khc bo v cc khng b ch hoc x ra. 4.4.2.2.2 Lm nhn u Cc g phi lm nhn u khi iu kin t yu cu. Khi cn thit cc phi bt m cc bng kim loi theo thit k c K s ng , cc u nhn ca cc phi to hnh dng cn thn m bo lc nn ng u trn mi cc. 4.4.2.2.3 Thp bt mi cc v vu cc Thp bt mi cc bo v tt c cc loi cc khi d kin l kh ng v cc vu cc c dng tng kh nng chu lc ca cc thp phi thuc loi cho trong h s hp ng v phi dng ti cc v tr quy nh hoc theo lnh ca K s. Chp bt miccbngthpphichtotthpcphhpviAASHTOM103M/M103 (ASTM A 27/A 27M). Cc thp bt mi cc hoc vu cc no c s dng theo la chn ca Nh thu phi c K s chp thun. 4.4.3 ng cc Cc phi ng ti cc cao mi cc ti thiu v kh nng chu lc cho trn h shpnghoccKschpthun.Ccccbchilnqu6mmtrongkhi ng cc cc ln cn th phi ng li. 4.4.3.1 ng cc th Cc th v cc th ti trng tnh khi c nu trong h s hp ng phi c cung cp theo cc chiu di nh v ng ti cc v tr v ti cao do K s hngdntrckhicccckhctrongkhuvccncvoccthclnh ng. Tt c cc cc th phi ng bng ba xung ng (va p) tr khi c quy nh khc trong h s hp ng. Ni chung, chiu di t hng ca cc cc th s ln hn chiudictnhcaccsnxutcththayitheoiukint.Thitb dng ng cc th phi ging ht thit b m Nh thu kin ngh s dng khi ng cctht.VicchpthunthitbngccphiphhpviccyucucaTiu chun ny. Tr khi c K s cho php lm khc, Nh thu phi o t ti mi cc th ti cao ca y mng trc khi ng cc. Cc th phi ng theo cch m nht ba do K s xc nh ti cao c tnh ca mi cc. Cc th khng t s nht ba quy nh trn y su trn cao mi cc c tnh cho trn h s hp ng 300mm c php hi phc trong mt thi gian t 12 ti 24 gi theo xc nh ca K s trc khi ng li. Khi c th, ba phi khi ng trc khi bt u ng li bng cch ng t nht 20 nht vo cc khc. Nu s nht ba quy nh khng t c khi ng li, K s c th ch th cho Nh thu ng mt phn hoc c chiu di cc th cn li v lp li trnh t hi phc PHN 4: MNG CC NG4 - 12 - ng li. Khi theo lnh ca K s, cc cc th ng ti cao ca bn v v khng t c s nht ba yu cu th phi ni v ng cho ti khi t c kh nng chu lc yu cu. 4.4.3.2 chnh xc ng cc Cc cc phi ng vi sai lch khng qu 1:50 theo trc cc thng ng hoc theotrcccxinchotronghshpng,trcccc dng lmtrgiophi ng sao cho m cc c th t vo ng v tr m khng gy ra tc ng xu ln sc chu ti ca cc cc. Cc cc mng sau khi ng khng c lch khi v tr cho trong h s hp ng qa 25% ng knh cc hoc 150mm, ly s no ln hn. Mi ph tn do tng kch thc mng hoc tng ct thp do cc cc b lch khi v tr phi do Nh thu chu. 4.4.4Xc nh kh nng chu lc 4.4.4.1 Tng qut Ccccphingtikh nngchu lcchotrnhshpng.Khnng chu lc ca cc s do K s xc nh nh quy nh trong h s hp ng bng cch s dng mt hoc mt t hp ca cc phng php sau. Phng php A, Cng thc cckinh nghimscsdngkhikhngcccquynhkhctronghshp ng. 4.4.4.2 Phng php A Cng thc cc kinh nghim Khikhngngtichitheothchnh, khnngchu lcnhnhs ca cc s c xc nh bng cng thc cc kinh nghim. Tr khi c quy nh khc trong h s hp ng, c th dng cng thc sau y: Vi ba ri t do (trng lc) Pn = (0, 6)1635( 25)WHS +(4.4.4.2-1) Vi cc loi ba khc Pn = (0, 6)166, 7( 2, 5)ES +(4.4.4.2-2) Trong : Pn : kh nng chu lc cha nhn h s, hay danh nh, N W : trng lng ca phn va p ca ba, kg H : chiu cao ri, m E : nng lng do mi nht ba sinh ra, J. Gi tr da trn nht ba thc t hoc p lc bung ny quan st c (ba iden song ng), PHN 4: MNG CC NG4 - 13 - S ;d xung su trung bnh tnh theo mm ca 5 ti 10 nht ba cui cng ivibatrng lcv10 n20nhtbacuicngivicc loi ba khc. Cc cng thc trn ch p dng c khi : Ba c ri t do (ba trng lc v ba n ng). u cc khng b x ra, v vn hoc b cc h hi khc. xung su (thm nhp) nhanh hp l v ng u. ny tr li khng ng k. Khng dng cc dn. xung su theo nht ba c th o trong ln ng u tin hoc trong ln ng li vi mt ba khi ng trc vi nng lng sau mt thi gian cc n nh, theo xc nh ca K s. Trong trng hp dng tia nc xi kt hp vi ng cc, kh nng chu lc c xc nh bng cng thc trn t cc kt qu ng cc sau khi khng xi nc na. Ch gii: Cng thc k lc mi v cng trnh ENR c sa dng cho ti trng nhn h s bng cch nhn vi tng cc ti trng nhn h s v chia cho tng cctitrngchanhnhs.ykhngphilshiuchnhthngkvdo khng th hin bt k s ci thin no v tnh khng chnh xc ni ting ca phng trnhENR.HssckhngdngchoccphngtrnhENRphthucvo phng php c dng xc nh sc khng a k thut ca cc chu ti dc trc. H s 0,8 l s trit gim tip theo ch dng khi s dng cng thc ENR. H s 0,6 l xt n s khc bit truyn thng gia bin an ton gi nh trong thit k v quy nh truyn thng trong Phn II ca Tiu chun cu. Phn ny cn hay dng t K s-lp-bin bn (Engineer-of-Record) nn b i v nhim v caT vn gim st Vit Nam l phi lp bin bn ri. 4.4.4.3 Phng php B Phn tch phng trnh sng Khi c quy nh trong h s hp ng, kh nng chu lc cc hn ca cc c xc nh bng vic phn tch phng trnh sng. Cc tnh cht ca t, cc v thit b ng cc s dng trong phn tch ny dc cho trong h s hp ng, hoc theo xc nh ca K s bng cch s dng cc s liu do Nh thu cung cp, cc l khoan th nghim v khi s dng cc th nghim ng lc cc (Phng php C). Kh nng chu lc ca mt cc phi ly bng 85% kh nng chu lc cc hn tnh ton ch ly theo phn tch pbng trnh sng cho mt mc thm nhp cho trc. Khi kh nng chu lc cc hn c xc nh t phn tch phng trnh sng c hiu chnh t cc kt qu th nghim ng lc cc th kh nng chu lc cha nhn h s hoc danh nh phi ly bng kh nng chu lc cc hn tnh ton c t phn tch phng trnh sng cho mc thm nhp cho trc. 4.4.4.4 Phng php C - Th nghim ti trng ng PHN 4: MNG CC NG4 - 14 - Cc o c ng lc phi dok s lm trong khi ng cc cc gi l cc th nghim ti trng ng. Kh nng chu lc cc hn ca cc s c xc nh vi vic s dng cc dng c phn tch cc v kt qu ny c coi l sc khng danh nh. Trc khi t ln gi ba, Nh thu phi chun b cho mi cc b tng v /hoc cc g c ch nh c th ly c cc s liu o c tc sng v phi khoan sn vo cc cc l gn thit b o cn thit. Khng cn ly cc s liu o c tc sng trc khi ng cc thp. Khi o c tc sng, cc phi t v tr nm ngang cch khi mt t v khng tip xc vi cc khc. K s s cung cp thit b, vt liu v nhn lc cn thit khoan cc l trn cc lp cc thit b. Nhthuphilpccthitbvoccsaukhiccttrngiba,hoc cung cp cho K s cc phng tin hp l ti c cc lp cc thit b sau khi ccdngtrngiba.Nhthuphicungcpsnckchthctithiu 1200x1200mm(1,44m2)cthitknngctinhcctrongkhiccnm trn gi ba. Nh thu phi cung cp in cho thit b th nghim ng lc. in xoay chiu cpticmphilin10A,115vn,55-60chuk.Ccmyphtinhin trng dng lm ngun in phi c trang b ng h o gim st cc mc in th v tn s. Nh thu phi cung cp mt bung nh bo v thit b th nghim ng lc. Bungbovphickchthcsntithiu2400x2400mm(5,76m2)vmtmi che cao ti thiu 2100mm. Nhit trong bung phi duy tr trn 70C. Bung phi t cch v tr th nghim trong vng 15000mm. Nh thu phi ng cc ti sau ti thit b th nghim ng lc cho bit tckhnngchu lcthitkchotronghshpng,trkhicchth khc ca K s. Nu K s ch th, Nh thu phi gim nng lng ng truyn cho cc bng cch dng thm cc m hoc gim nng lng ra ca ba duy tr cc ng sut c th chp nhn c trong cc. Nu cc s o ca thit b th ng lc chothyngkhng ngtmcc,Nh thuphingaytckhcchnh lihthng ng cc cho thng hng. Khi K s ch th, nh thu phi i ti 24 gi sau khi thit b li c gn vo, ng li cc th nghim ti trng ng. Ba phi khi ng trc khi bt u ng li bng cch ng t nht 20 nht vo cc cc khc. Yu cu cc xuyn xung ti a khi ng li phi l 150mm hoc tng nht ba ti a bng 50, ly trng hp no xy ra trc.Saukhing li,Ksscungcp caoctucc hocquynhng su thm v th nghim thm. 4.4.4.5 Phng php D - Th nghim ti trng tnh Th nghim ti trng phi tin hnh theo cc phng php xut trong ASTM D 1143 bng cch s dng phng php th nghim nn nhanh ti trng tr khi phi th nghim ti lc ph hoi ln st hoc ba ln ti trng thit k, ly trng hp no xyratrc.ThitbthnghimvhthngophiphhpviASTMD1143. Nh thuphi np cho K s chp thun h s hp ng chi tit v dng c cht ti kin ngh dok s chuyn nghipchun b. Dng c phi c ch to cho php tng dn cc ti trng khc nhau m khnglm rung cc th. Khi phng php th nghim yu cu s dng cc cc chu ko (neo) sau c s dng nh cc vnh PHN 4: MNG CC NG4 - 15 - cu trong cng trnh, cc cc chu ko ny phi cng loi v ng knh nh cc cng trnh v phi ng v tr cc vnh cu khi c th. Kh nng chu lc danh nh phi ly bng ti trng ph hoi. Ti trng ph hoi ca mt cc th nghim chu nn dc trc l ti trng to ra ln lc ph hoi u cc bng: Sf = S + (3,8 + 0,008D)(4.4.4.5-1) Trong :Sf = ln lc ph hoi, mm D = ng knh hoc b rng cc, mm S = bin dng n hi ca tng chiu di cc khng c chng , mm Cao nh cc th nghim phi xc nh ngay sau khi ng v ngay trc khi th ti kim tra nng ln ca cc. Cc no b nng ln qu 6mm phi ng li hoc kch cho v cao ban u trc khi th nghim. Tr khi c quy nh khc trong hshpng,phiquanstmtthigiantithiu lbangygia lcngmt cc neo no hoc cc th ti v lc bt u th ti. 4.4.5 Ni cc 4.4.5.1 Cc thp Phi s dng cc c chiu di khi c th. Nu cho php ni, phng php ni phi c quy nh trong h s hp ng hoc c K s chp thun. Nn dng phng php hn h quang khi ni cc cc thp. Ch cc th hn c cp chng ch mi c hn. 4.4.5.2 Cc b tng Cc b tng khng c ni, ngoi cc on ni ngn cho php y, tr khi c quy nh trong h s hp ng hoc bng vn bn ca K s. Cconningncththmvonhccccbtngctthpsa li cc trng hp khng d on trc. Sau khi ng xong, b tng u cc phi ct b, li ct thp l ra mt on di bng 40 ng knh. Mt ct cui cng ca b tngphivunggcvitrccc.Phibucchcchnctthptngtctthp dngtrongccvoonthpthravtvnkhuncnthit,chcnthn phngnga rrdctheocc.Cht lng btngkhngckmchtlngb tng dng trong cc. Ngay trc khi b tng, u cc phi xi nc k, cho kh, sauphmtlpmngximng,vahocvtliudnhktphhp.Vnkhun phi gi ti ch t nht by ngy, sau c tho cn thn v ton b b mt l ra ca cc phi c hon thin nh quy nh phn trc. 4.4.5.3 Cc g PHN 4: MNG CC NG4 - 16 - Cc g khng c ni tr khi c quy nh trong h s hp ng hoc bng vn bn ca K s. 4.4.6 Cc h hng Phng php ng cc khng c lm dng qu mc v sai phm qu ng lmchobtngbvv nt,b ntnc hi, gbvvxra,hocthpbbin dng qu mc. Khng c php kch p cc dch vo ng v tr nu K s cho rng vic dch l qu ng. Bt c cc no b h hng do cc khuyt tt bn trong, hoc do ng khng ng cch hoc ng lch khi v tr ng ca n, hoc ng thp hn caouccchshpnghocKsquynhuphisachali bng chi ph ca Nh thu theo mt trong cc cch c s chp thun ca K s i vi cc c vn di y: Phi rt cc ln v thay bng cc mi, nu cn, l mt cc di hn. ng mt cc th hai k vi cc b h hng hoc cc b thp. Cc phi ni hoc c di thm theo quy nh khc y hoc mt phn mng c m rng chn cc ng cch. Tt c cc cc b y ln do ng cc cc ln cn hoc do bt c nguyn nhn g cng phi ng xung li. Tt c cc vt liu v cng vic sa cha phi do Nh thu cung cp vi khon chi ph ca h. 4.4.7 Ct cc 4.4.7.1 Tng qut Tt c cc cc phi ct mt mt phng ng vi cao yu cu v neo vo kt cu nh cho trong h s hp ng. Tt c cc on cc ct b thuc v ti sn ca Nh thu v phi thu dn tho ng. 4.4.7.2 Cc g Cc cc g m g hoc i cc phi ca theo ng mt phng y kt cu chng bn trn. Ni chung, chiu di cc trn cao ct b phi cho php loi b hon ton mi vt liu b h hng do ng cc, nhng cc ng ti rt gn cao ct phi b vo hoc loi b bng cch khc tt c cc vt liu b x, v hoc b h hi khc mt cch thn trng. Ngay sau khi ct ln cui cng cc cc g c x l ca mng, din tch ct phi qut kn hai lp cht bo qun, sau l mt lp dy c hc n trn ph xi mng hoc cht bt c chp thun khc. Cc g x l c cc ch ct l ra trong kt cu th din tch ct phi x l bng ba lp vt liu bo qun ph hp. PHN 4: MNG CC NG4 - 17 - Ch gii:Bo qun cc g tham kho Tiu chun gi gn g x l bo qun M4 ca Hip hi bo qun g. 4.5 O C V THANH TON 4.5.1 Phng php o c 4.5.1.1 Cc g, thp v b tng 4.5.1.1.1 Cc cung cp Khi lng ca mi loi cc c thanh ton s l tng s chiu di tnh bng mtcacccc.Ccphi l loihnhvchiu dicghitronghshpng hoc c K s cho dng bng vn bn, c cung cp ph hp vi cc yu cu v vt liu theo Tiu chun ny v c ct gi, i vi cc cc b tng c ti ch h xong, trng thi tt ti a im cng trnh v c K s chp thun. Chiu di ca cc cc, k c cc th do Nh thu cung cp thay th nhng cc trc y cKschpthunnhngsaubhhngtrckhihonthnhhpng khng c tnh vo khi lng thanh ton. Khicnnithmcc,chiudinithmtheolnhbngvnbncaKs c tnh vo trong chiu di cc cp. 4.5.1.1.2 Cc ng Khilngccngcamiloicthanhtonlslngccchp nhn c ca mi loi cc ng. Vic khoan trc, xi nc hoc cc phng php khc lm d dng cho vic ng cc, khi c yu cu hoc c php s khng c tnh khi lng v vic thanh ton phi xt tnh vo trong n gi thanh ton cho cc cc ng. 4.5.1.2 Mi ni cc, chp bt mi cc v vu cc Khi trn h s hp ng c nu cc mi ni cc, cc chp bt mi cc bo v hoc cc vu ct t, s lng mi ni, chp bt v vu cc o thanh ton l s lng cho trn h s hp ng hoc theo lnh bng vn bn ca K s, v thc t lp trn cc dng cho cng trnh. Khng thanh ton cho cc mi ni, chp bt v vu cc c dng theo phng n ca Nh thu. Khi khng c nu trong h s hp ng, cc mi ni, chp bt hoc vu do K s ra lnh s c thanh ton theo cng vic lm thm. 4.5.1.3 Th ti trng Khi lng th ti trng c thanh ton l s lng th nghim ti trng honthnhvcchpthun,trccthnghimtitrngclmtheoca Nh thu khng c k vo khi lng o c thanh ton. PHN 4: MNG CC NG4 - 18 - Ccccneovccthlmthnghimtitrng,dcnmtrongcng trnhvnhcuhaykhng,ctnhnhcccccungcpvngvc thanh ton theo hng mc thch hp. 4.5.2 C s thanh ton Cc khi lng c xc nh nh quy nh, c thanh ton theo n gi trong h s hp ng cho n v oc tng ng cho tng loi, vi mi loi hng mc thanh ton chung lit k di y i vi mi kch thc v loi cc cho trong h s hp ng: Hng mc thanh tonn v thanh ton Cc cp Cc ng Cc th cp Cc th ng Th ti trng cc (tnh) Th ti trng cc (ng) Mi ni Chp bt Vu cc Mt di Ci Mt di CiCi Ci Ci Ci Ci Vic thanh ton cho vic cung cp cc bao gm mi chi ph lin quan trong vic cung cp v giao cc, k c ng vch cho cc cc c ti ch, ti cng trng v tt c cc chi ph lin quan n vic cung cp v c b tng v t ct thp i vi cc cc c ti ch. Vic thanh ton cho vic ng cc phi n b y cho mi chi ph lin quan trongvicngvctthcsccccvngvch,vchottcccchiphcha cnbtrongcchngmcthanhtonkhclinquantiviccungcpnhn lc, thit b v vt liu dng thi cng cc cc nh cho trn h s hp ng. Khi vic huy ng my mc v thit b cho d n khng c thanh ton ring, vic thanh ton cho vic ng cc cng phi k n vic n b y cho chi ph huy ng tt c cc thit b cn thit bc d v ng cc sau khi cc cc c giao ti cng trng. Vic thanh ton cho cc th nghim ti trng bao gm vic n b y cho vic cung cp nhn lc, thit b v vt liucn thit cho vic thc hin cc th nghim ti trng nh quy nh. Victhanhton theocc hngmcchitrthchhpiviccminicc, cc chp bt v vu cc bao gm vic n b y cho tt c cc chi ph lin quan n vic cung cp tt c vt liu v thc hin cng vic bao gm vic gn vo hoc lp t cc mi ni, cc chp bt v vu vo cc. PHN 4: MNG CC NG4 - 19 - Ti liu vin dn AASHTO.2002.StandardSpecificationsforHighwayBridge,17thEdition,HB-17, American Association of State Highway and Transportation Officials, Washington, DC. AASHTO. 2004. AASHTO LRFD Bridge Design Specifications, 3rd Edition, LRFDUS-3 orLRFDSI-3,AmericanAssociationofStateHighwayandTransportationOfficials, Wahington, DC. Available in customary U.S. units or SI units. AASHTO.2004.StandardSpecificationsfor TransportationMaterialsand Methodsof SamplingandTesting,24thEdition,HM-24,AmericanAssociationofStateHighway and Transportation Officials, Washington, DC. AWPA. 2002. Standard for the Care of Preservative- Treated Wood Products, AWPA-M4-02, American Wood-Preserverss Association, Selma, AL. EngineeringNews-Recordformula.Basedonaformulapublishedin1888byA.M. Wellington, editor of Engineering News-Record, New York, NY. PHN 5: CC KHOAN V GING KHOAN 5 - 1 - PHN 5: CC KHOAN V GING KHOAN MC LC 5.1 M T 5.2 BN V THI CNG. 5.3 VT LIU... 5.3.1 B tng 5.3.2 Ct thp.. 5.3.3 ng vch 5.4 THI CNG. 5.4.1 Bo v cc kt cu hin c.. 5.4.2 Trnh t thi cng 5.4.3 Cc phng php v thit b chung... 5.4.4 Phng php thi cng kh.. 5.4.5 Phng php thi cng t.. 5.4.6 Phng php thi cng ng vch tm thi. 5.4.7 Phng php thi cng ng vch vnh cu 5.4.8 Cc phng php thi cng khc 5.4.9 Cng tc o.. 5.4.10 ng vch.. 5.4.11 Va khoan 5.4.12 Kim tra l khoan o 5.4.13 Thi cng v t lng ct thp 5.4.14 b tng, bo dng v bo v b tng. 5.4.15 Cc th v cc m rng chn. 5.4.16 Dung sai thi cng ... 5.4.17 Th nghim tnh ng nht.. 5.5 CC TH NGHIM TI TRNG CC KHOAN. 5.6 O C V THANH TON 5.6.1 o c. 5.6.1.1 Cc khoan... 5.6.1.2 Mng m rng chn...... 5.6.1.3 Cc th 5.6.1.4 Phn m rng th nghim... 5.6.1.5 Thm d.. 5-3 5-3 5-3 5-3 5-4 5-4 5-4 5-4 5-4 5-4 5-5 5-5 5-5 5-6 5-6 5-6 5-6 5-7 5-8 5-8 5-8 5-9 5-9 5-10 5-10 5-11 5-11 5-11 5-11 5-11 5-11 5-11 PHN 5: CC KHOAN V GING KHOAN 5 - 2 - 5.6.1.6 ng vch vnh cu 5.6.1.7 Th ti. 5.6.2 Thanh ton. 5.6.2.1 Cc khoan.. 5.6.2.2 Mng m rng chn.. 5.6.2.3 Cc th 5.6.2.4 Phn m rng th nghim.. 5.6.2.5 L thm d.. 5.6.2.6 ng vch vnh cu 5.6.2.7 Th ti. 5-11 5-12 5-12 5-12 5-12 5-12 5-12 5-12 5-13 5-13 PHN 5: CC KHOAN V GING KHOAN 5 - 3 - PHN 5CC KHOAN V GING KHOAN 5.1 M T Cng vic ny bao gm vic thi cng cc cc khoan v ging khoan, c hoc khng c mng loe, k c vic t ct thp v b tng theo ng cc h s hp ng v cc quy nh ny.Ch gii: . Trong phn ny thut ng cc c ngha l cc hoc ging. 5.2 BN V THI CNG Khihshpngyucu,tnhtbntunltrckhibtucngvic khoan cc, Nh thu phi np cho K s xem xt v chp thun k hoch thi cng cc khoan. H s np phi bao gm: Danhmcthitbnghsdng,gmcncu,mykhoan,mikhoan, thng vt bn, thit b lm sch sau cng, thit b lc ct, bm va st, thit b ly mu, cc phu hoc cc bm b tng, ng vch vv Trnh t chi tit thao tc thi cng chung v trnh t thi cng cc khoan trong cc tr khung hoc nhm cc. Chi tit cc phng php thi cng cc khoan. Khicnnvast,chititcaphngphpkinnghtrn,lun chuyn v lc ct trong va st. Chi tit cc phng php lm sch h khoan. Chi tit t ct thp k c cc phng php v t ng tm. Chi tit b tng, bo dng v bo v. Chi tit mi th nghim ti trng yu cu. Thng tin khc cho trn h s hp ng hoc do K s yu cu. Nh thu ch c bt u thi cng cc cc khoan sau khi cc bn v thi cng cachngcKschpthun.Vicchpthunnykhnggimnhtrch nhim ca Nh thu v cc kt qu t c do s dng cc bn v ny hoc bt k trch nhim no khc ca Nh thu theo h s hp ng. 5.3 VT LIU 5.3.1 B tng B tng phi ph hp vi cc yu cu ca Phn 8 Kt cu b tng. B tng phi l loi A tr khi c quy nh khc trong h s hp ng. PHN 5: CC KHOAN V GING KHOAN 5 - 4 - 5.3.2 Ct thp Ct thp phi ph hp cc yu cu ca Phn 9 Ct thp. 5.3.3 ng vch ng vch no c coi l mt phn ca cng trnh vnh cu phi ph hp vi ccyucucaPhn11Ktcuthp.ThpphilloiAASHTOM270M/M270 (ASTMA709/A709M)cp36(cp250)trkhicquynhkhctronghshp ng. 5.4 THI CNG 5.4.1 Bo v cc kt cu hin c Phi dng mi cch phng nga hp l phng h hng cho cc kt cu hincvcngtrnhtinchcngcng.Ccbinphpnyphibaogm,nhng khngchhnchviclachnccphngphpthicngvccphngthc ngn nga vic ln st qu mc khi ly t trong cc, gim st v kim tra cc rung ng do h cc ng vch hoc cc vn, khoan cc hoc do n mn nu c php. 5.4.2 Trnh t thi cng Mivicomngtrongcccckhoancthicngphihonthnh trc khi vic thi cng cc bt u. Tr khi h s hp ng quy nh khc, ni no cc khoan c thi cng cng vi vic p nn ng, chng phi thi cng sau khi p t. 5.4.3 Cc phng php v thit b chung Phi tin hnh o theo yu cu ca cc khoan v mng loe xuyn qua bt c loi t no gp phi, theo cc kch thc v cao cho trn h s hp ng hoc theo lnh ca K s. Cc phng php v thit b s dng phi ph hp vi cc mcchnhlmvtphigp.Nichung,thngdngphngphpkh, phng php t, phng php ng vch tm thi, phng php ng vch vnh cu tutheocnthit to raccmngbtngtt, bnkhngckhuyttt.Phng php ng vch vnh cu ch dng khi h s hp ng yu cu hoc c K s cho php. Khi h s hp ng yu cu mt phng php thi cng no , phi s dng phng php . Nu khng quy nh phi dng phng php no, Nh thu phi la chn v s dng phng php cn thit hon thnh tt cng trnh tu theo cc iu kin ti ch v c K s chp thun. PHN 5: CC KHOAN V GING KHOAN 5 - 5 - 5.4.4 Phng php thi cng kh Ch c dng phng php thi cng kh ti cc a im m mc nc ngm v cc iu kin a im ph hp cho php thi cng cc trong h o tng i kh, v khi mt bn v chn ct n nh v c th kim tra bng mt trc khi b tng. Ch gii: Phng php kh gm c khoan h ct, rt nc tch t v loi b vt liu ri rc khi h o, b tng cc trong h o tng i kh. 5.4.5 Phng php thi cng t Phisdngphngphpthicngtticcaimmcchokh khng th duy tr b tng cc.Phi b tr cc ng vch tm thi trn b mt gip cho vic nh v v tr v tuyncc,ngnnganhhobst,trkhichngminhcchoKstho mn l khng cn n ng vch trn mt. Chgii:Phngphpnygmcvicsdngnchocvakhong duy tr n nh ca chu vi l trong khi tin hnh o ti su cui cng, t lng thp v b tng. Phng php ny c th yu cu loi b ct v lm sch va st; lm sch cui cng l o bng gu tt, my ht kh nn, bm t chm hoc cc thit b khc; b tng cc vi mt ci phu hoc bm b tng. 5.4.6 Phng php thi cng ng vch tm thi Phidngphngphpthicngngvchtmthiticcaimmcc phng php thi cng kh hoc t khng thch hp. Nh mt phng n khc ca phng php o t, ng vch tm thi c th t bng cch ng hoc rung trc khi o ti cc gii hn cao thp hn lp t st. Trckhirtngvchvtrongkhiangrtngvch,caobtngti trong ng vch phi cao sao cho mi cht lng tp trung sau ng vch c dch chuyn ln trn m khng lm bn b tng cc. Ch gii: phng php ny gm c vic tin hnh o qua lp t d st bng phng php t nh m t trong iu 5.4.5 Phng php thi cng t. Khi o ti mt lp gn nh khng thm nc, t mt ng vch trong l v kht kn trong lp gn nh khng thm nc. Sau khi dung dch khoan b ht i khi ng vch, c th tin hnhkhoantheo phngphpkhtrkhingvchphirtlnkhi btngcc. nutnhhnhncrngncnvicsdngphngphpkh,vicophihon thnh theo phng php t. C th b va st nu c th t ng vch m ch gy ra st rt nh trong l. PHN 5: CC KHOAN V GING KHOAN 5 - 6 - 5.4.7 Phng php thi cng ng vch vnh cu Phidngphngphpthicngngvch vnhcukhihs hpngyu cu. Nu khng th h chiu su thm nhp, K s c th yu cu o t trong phn chnngp ca ng vch hoc o mt l dn di chn ng vch cho ti khi ngvchtthmnhpcn thit. Trongmtstrnghpc thcnnvic khot rng thm ng knh ngoi ca ng vch a ng vch xung. ng vch phi lin tc gia cc cao cho trn h s hp ng. Khng c dng ng vch tm thi thay cho hoc thm vo ng vch vnh cu, tr khi quy nh trong h s hp ng hoc cho php bng vn bn ca K s. Sau khi t ng vch v o cc xong, ng vch phi ct ti cao quy nh, t ct thp v b tng vo trong phn ng vch li ti ch. Ch gii; Phng php ny gm c vic ng hoc xoay mt ng vch ti chiu su quy nh trc khi vic o bt u. 5.4.8 Cc phng php thi cng khc Nh thu c th ngh cc phng php thi cng khc ngn nga t st v khng ch nc ngm. Cc kin ngh ny phi np theo iu 5.2 Bn v thi cng km theo cc s liu chng minh. 5.4.9 Cng tc o Cao y ca cc khoan cho trn bn v c th iu chnh trong thi cng nu K s xc nh rng t nn gp phi trong khi o khng ph hp hoc khc vi loi t d kin trong thit k cc khoan. Nh thu phi ly cc mu t hoc li khi c nu trong h s hp ng hoc theo ch dn ca K s xcnh tnh cht t trc tip bn di h o. K s s kim tra cc mu hoc li t xc nh su yu cu cui cng ca h o cc khoan. t o ly ra khi l khoan v mi dung dch khoan phi dn b theo h s hp ng hoc theo ch th ca K s. Khi trn h s hp ng c nu dn cc mng loe, chng phi c o to thnh mt din tch chu nn c kch thc v hnh dng cho. Ming loe phi o bng phng php c gii. 5.4.10 ng vch ng vch phi bng kim loi, nhn, sch, kn nc v c d cng chu c cc ng sut khi cu v khi ng v chu c p lc ca c b tng v ca cc loi t xung quanh. ng knh ngoi ca ng vch khng c nh hn kch thc quy nh ca cc. PHN 5: CC KHOAN V GING KHOAN 5 - 7 - Phi rt cc ng vch tm thi ln khi b tng cn cha ng cng. Ni chung, vic rt ng vch tm thi ch c bt u sau khi b tng trong cc ti mt t hoc trn mt t. c php lm ng vch c th chuyn ng bng cch quay, tc ng p lc xung v v d rt ln hoc rt bng ba rung. Vic rt ng vch phi lm vi tc chm, vi lc ko ng u theo trc dc. Phiduytrmtctbtngbntrnyngvchthngcp lc thu tnh ca nc hoc dung dch khoan bn ngoi ng vch. 5.4.11 Va khoan Va trong qu trnh khoan phi l loi va khong, va phi c c ht khong cht l lng vi cc c trng nht v keo vn chuyn t o ti h thng phn loi ph hp. T l phn trm v trng lng ring ca vt liu dng lm cht l lng phi duy tr n nh ca l o v cho php b tng ng n. Cao va phi duy tr ti mt chiu cao phng nga l b st. Va khong phi trn k trc vi nc ngt sch v vi thi gian cho vic hydrathotrckhiavotronglo.Phicnnccthngchavathch hpkhicquynh.Khngcphplmcchchavakhicyucuthng cha va trong d n, tr khi c php bng vn bn ca K s. Khi c quy nh trong h s hp ng phi c thit b loi b ct thch hp. Phi c cc bin php ngn chn va b ng cng trong l cc, nh khuy, tun hon hoc iu chnh cc tnh cht ca va. Nh thu phi tin hnh cc th nghim kim tra bng cc dng c ph hp i vi va khong xc nh t trng, nht v pH. Trong bng sau cho phm vi c th chp nhn c ca cc gi tr i vi cc tnh cht vt l ny. Bng 5.4.11-1 Phm vi cc gi tr 20oC Tnh cht, n v lc a va vo lc b tng trong l Phng php th nghim T trng (kg/m3)1030 -11101030 - 1200Cn t trng nht (S/L)30 4830 48Hnh nn pH8 118 11Giyhocthc o pH Cc chun s sau y dng cho Bng 5.4.11-1 Tng gi tr t trng thm 32 kg/m3 trong nc mn. Nu cn loi b ct; hm lng ct khng c vt qu 4% (theo th tch) bt c im no trong l o xc nh theo th nghim hm lng ct ca Vin Du m M. PHN 5: CC KHOAN V GING KHOAN 5 - 8 - Cc th nghim xc nh cc gi tr t trng, nht v pH phi lm trong khi o l cc xc nh kiu lm vic ph hp. Trc khi b tng cc, cc mu va phi ly t y vti cc khong cch khng qu 3000mm trn ton b chiu cao va. Mi phn va b nhim bn nng tch t y cc phi loi b. Va khong phi trong phm v cc yu cu k thut ngay trc khi b tng. 5.4.12 Kim tra l khoan o Nh thu phi cung cp thit b kim tra cc kch thc v thng ca mi l cc. Cc kch thc v thng phi do Nh thu xc nh c s ch dn ca K s. Chiu su cui cng ca cc phi c o sau khi dn sch ln cui. L cc khoan phi dn sch s ch cn khng qu 12mm t bi lng y cc trc khi b tng cc chng. i vi cc chu ma st ch cn khng qu 50mm t bi lng. Phi gi nh l cc chng, tr khi c nu khc i trong bn v. Cc khoan phi c K s chp thun trc khi tip tc thi cng. 5.4.13 Thi cng v t lng ct thp Lng ct thp gm c thp cho trn h s hp ng cng thm cc thanh lm cng lng, cc ming k, cc tm chnh cho ng tm v cc ph kin cn thit khc, tt c phi lp rp hon chnh thnh mt khi ngay sau khi l cc o c kim tra v nghim thu v trc khi b tng cc. Ct thp trong cc phi ging v sao cho ct thp nm trong cc dung sai cho php so vi v tr d kin cho ti khi b tng c ct thp. Khi b tng c theo phng php rt ng thng ng, phi dng cc dng c km gi tm thi phng lng thp b tri ln trong khi b tng. Phi dng cc ming gi c ly bng btnghocccdngcgiclykhngbnmnkhccchpthunt khongcchkhngvt qu1500mmdctheocc mbovtr lngng tmvilcco.Khikchthcctthpdcvtquthanhs25,cckhong cch ny khng c vt qu 3000mm. 5.4.14 b tng, bo dng v bo v b tng Phi tranh th b tng ngay sau khi t lng ct thp. Vic b tng phi lin tc trong cc ti cao nh cc. Phi tip tc b tng sau khi cc y cho n khi cht lng b tng u cc r rng l tt. B tng trong nc hoc va stphiquaphuhocbmbtngbngcchsdngccphngphpquy inh trong iu 8.7.5 b tng di nc. Btngtrongcclcckhphicvckttheoquynhtrong iu 4.3.2 Cc b tng c ti ch v cc quy nh ny. Vi cc c ng knh nh hn 2400mm, thi gian t lc bt u b tng trongcctilchonthnhxongkhngcvtqu2gi.Viccccc ngknhbng2400mmvlnhn,tcbtngkhngnhhn9000mm PHN 5: CC KHOAN V GING KHOAN 5 - 9 - chiu cao cc cho mi thi hn 2 gi. Hn hp b tng phi thit k sao cho b tng cn trng thi do d thi cng trong sut gii hn 2 gi b tng. Khicaonhcctrnmtt,phncctrnmttphicvnkhun tho ra c hocc ng vch vnh cu khi c quy nh trong h s hp ng. B tng cc phi c rung hoc xc ti su 1500mm bn di mt t tr khi ti y t mm khng c ng vch hoc va st cn li trong l o c th trn vi b tng. Sau khi , cc mt b tng ca cc tm thi l ra phi c bo dng theo cc quy nh ca iu 8.11 Bo dng b tng. t nht l 48 gi sau khi b tng cc, khng c c thao tc thi cng no c th gy ra chuyn ng ca t tip gip vi cc, ngoi rung ng nh. Cc phn cc khoan l ra trong nc phi c bo v khi tc ng ca nc bng cch khun ti ch t nht by ngy sau khi b tng. 5.4.15 Cc th v cc m rng chn Cc th phi c thi cng khi c yu cu trong h s hp ng. Thi cng cc th c dng xc nh xem cc phng php, thit b v cc trnh t do Nh thu s dng c to ra mt l cc khoan p ng cc yu cu ca h s hp ng. Nh thu phi xem xt li phng php v thit b ca mnh khi cn, ti mi thi im trong khi thi cng l cc th, hon thnh l khoan o c nh mun. Vtrccthphi cchotrong hshpng hoctheochdncaK s. ng knh v su ca l cc th hoc cc l cc th phi bng ng knh v su nh cc cc khoan sn xut cho trn h s hp ng hoc theo ch dn ca K s. Cc l cc th phi nhi y b tng thng theo cng mt cch nh cc s c thi cng, tr khi mt vt liu lp khc c nu trong h s hp ng hoc do K s quy nh. KhiNhthukhngchngminhcmtcchthomntnhchnhxcca phng php, trnh t hoc thit b ca mnh, h phi thc hin thm cc cc th m khng c Ch u t cp thm chi ph. Khi cho trn h s hp ng hoc khi K s ra lnh bng vn bn, cn phi m rng chn trong cc l cc th xc lp tnh kh thi ca vic m rng chn trong mt lp t c bit no . 5.4.16 Dung sai thi cng Phi duy tr cc dung sai thi cng sau y trong thi cng cc khoan: Cc khoan phi nm trong khong 75mm so vi v tr cho trong bn v b tr mt bng ti cao nh cc. thngngcalccsovibnvkhngcqu20mm/mchiu su. Sau khi ton b b tng, nh ca lng ct thp khng c cao qu 150mm v thp qu 75mm so vi v tr trong bn v. PHN 5: CC KHOAN V GING KHOAN 5 - 10 - Khidngngvch,ngknhngoicangvchkhngcnhhn ng knh cc cho trong h s hp ng. Khi khng dng ng vch ng knhtithiucacckhoanphibngngknhchotronghshp ngviccngknh600mmhocnhhn,vkhngnhhnqu 25mm so vi ng knh cho trong h s hp ng vi cc dng knh ln hn 600mm. Dintchchuptacaphnmrngchnphiotithiutheodin tchchuptatrongbnv.Ttccckchthckhccabnvv ming loe c th thay i khi c chp thun thch ng vi thit b s dng. Cao nh cc phi nm trong khong 25mm so vi cao nh cc theo bn v. ycalccophivunggcvitrccctrongphmvidungsai 60mm/m ca ng knh cc. Cc l cc khoan c thi cng theo cch m khi cc b tng hon thnh nm ngoiphmviccdungsaichophpthkhngcchpthun.Bocophng php sa cha phi do Nh thu np cho K s chp thun. Phi c c chp thun trc khi tip tc thi cng cc khoan. Cc vt liu v cng vic cn thit thc hin sa cha cc l o cc khoan qa dung sai cho php phi c Nh thu cung cp m khng c Ch u t chi tr. 5.4.17 Th nghim tnh ng nht Khibtngcccbngphngphpthicngt,vkhicyucu trong h s hp ng, cc hon thnh phi c c th nghim khng ph hu xc nh quy m cc khuyt tt c th c trong cc. Vt liu v cng vic cn thit th do Nh thu cung cp phi c quy nh trong h s hp ng. Trongtrnghpthnghimphthincclrnghocccchginon trong b tng m theo xc nh ca K s cho thy cc khoan khng tho ng v mt kt cu, phi loi b cc, vic thi cng cc cc khoan thm phi ngng li cho ti khi Nh thu sa cha, thay th hoc b sung cc h hng v K s chp thun cc sa cha. Vic ngng thi cng cc khoan cn tip tc duy tr cho ti khi c cc thay i bng vn bn v phng php thi cng cc khoan c K s chp thun. 5.5 CC TH NGHIM TI TRNG CC KHOAN Khicc ti liu hpnggmcvicthnghimcc,ttcccthnghim phi hon thnh trc khi thi cng bt k cc khoan no ca cng trnh. Nh thu phi hai tun l sau th nghim ti trng cui cng K s phn tch cc s liu th nghim ti trng trc khi quy nh cao mi cc khoan cho cc cc ca cng trnh. Phi c v tr cc th ti v cc neo, ti trng ti a v thit b th nghim u doNhthucungcp,victhchinthctthnghimccphichotronghs hp ng. PHN 5: CC KHOAN V GING KHOAN 5 - 11 - Saukhithnghimxong,ccccthvccneonukhngcdng lm cccacngtrnh,phicti cao thphnmtthonthin 900mm.Phn cc ct i do Nh thu b tr ch thanh thi. 5.6 O C V THANH TON 5.6.1 o c 5.6.1.1 Cc khoan Cc khoan hon thnh ti ch c o theo mt di cho mi c cc c lit k trong h s hp ng. Vic o c s o theo ng tim cc da trn cao mi cc v cao ct cc cho trn h s hp ng hoc theo lnh ca K s. 5.6.1.2 Mng m rng chn Mngmrngchnotheomtkhi,tnhtheocckchthcvhnhdng quynhtrong hshpnghoc ngknhsa litheoKs.Phnmrng gm c th tch ngoi theo bn v hoc kch thc c php ca cc ko di ti y phn m rng chn c o. 5.6.1.3 Cc th Cc th c ng knh quy nh c o t cao mt t lc bt u khoan, tnh theo mt di ca cc th khoan chp nhn c. 5.6.1.4 Phn m rng th nghim Phn m rng th nghim c o theo mt khi tnh theo cc kch thc quy nh trong iu 5.6.1.2 Mng m rng chn. 5.6.1.5 Thm d Cc l thm d c o theo mt di, o t cao nh cc ti y l thm d cho mi l thm d c php. 5.6.1.6 ng vch vnh cu ngvchvnhcucotheomtdichomicngvchchophps dng. Phi o dc theo ng vch t nh ng vch hoc nh cc ti y ng vch ti mivtrccmtingvchvnhcucphpsdng, lys liunonh hn. PHN 5: CC KHOAN V GING KHOAN 5 - 12 - 5.6.1.7 Th ti Cng vic th ti c o bng s ln th ti thc hin cho mi cc c ch nh th ti. 5.6.2 Thanh ton 5.6.2.1 Cc khoan Cc khoan c thanh ton vi gi hp ng theo mt di i vi cc khoan c ng knh quy nh, Vic thanh ton ny phi b p y cho tt c cc chi ph bao gm vic o cc, thanh thi t o, cung cp v b tng, t ct thp, k c milao ng,vt liu,thitb,ngvchtmvccph phcnthitchovichon thnh cc khoan. 5.6.2.2 Mng m rng chn Mngmrngchncthicngtheocckchthcquynhhocc php s c thanh ton theo n gi hp ng cho mi mt khi i vi mng m rngchn.Victhanhtonnyphibpychovicovbtngngoi ng knh cc khoan, k c mi lao ng, vt liu, thit b v ph ph cn thit cho vic hon thnh loe. 5.6.2.3 Cc th Cc th c ng knh quy nh c thanh ton theo n gi hp ng cho mi mt di cc th. Vic thanh ton ny phi b p y cho vic o v b tng hoc vt liu lp bao gm mi lao ng, vt liu, thit b v ph ph cn thit hon thnh cc th. 5.6.2.4 Phn m rng th nghim Phnmrngthnghimcngknhvhnhdngquynhhocc php v c chp thun c thanh ton theo n gi hp ng cho mi mt khi i vi phn m rng th nghim.Vic thanh ton ny phi b p y cho vic o v b tng hoc vt liu lp bao gm mi lao ng, vt liu, thit b v ph ph cn thit hon thnh phn m rng th nghim. 5.6.2.5 L thm d Lthmdcthanhton theo n gihpngchomimtdi lthm d. Vic thanh ton ny phi b p y cho vic khoan v ly li cc l, ly ra v PHN 5: CC KHOAN V GING KHOAN 5 - 13 - ng gi cc mu hoc li v giao chng cho Ch u t v tt c cc chi ph cn thit khc hon thnh cng vic. 5.6.2.6 ng vch vnh cu ngvchvnhcucthanhtontheongihpngchomimtdi ng vch vnh cu. Vic thanh ton ny phi b p y cho vic cung cp v t ngvchcngthmccchiphlinquanncngviccthanhtontheocc hng mc i km. 5.6.2.7 Th ti Vic th ti c thanh ton theo n gi hp ng cho mi ln th ti. Vic thnh ton ny phi b p y cho tt c cc chi ph lin quan n vic th ti. PHN 6: NEO T 6 - 1 - PHN 6: NEO T MC LC 6.1 M T 6.2 BN V THI CNG. 6.3 VT LIU... 6.3.1 Thp ng sut trc. 6.3.2 Va phun 6.3.3 Cc b phn bng thp 6.3.4 Cc thnh phn bo v chng n mn.................................................... 6.3.5 Cc b phn khc. 6.4 CH TO... 6.4.1 Chiu di dnh kt v chiu di knhkt ca cp.................................... 6.4.1.1 Cp neo t bo v bng phun va........................................... 6.4.1.2 Cp neo t bo v bng v bc............................................... 6.4.2 Chiu di khng dnh kt. 6.4.3 Neo v ng loe u neo... 6.4.4 Ct gi v bc d cp.. 6.5 LP T 6.5.1 Khoan.. 6.5.2 a cp vo.. 6.5.3 Phun va 6.5.4