mc 06800 - gi cu

PHN 6 CNG TC B TNG V CU

Mc 06800 Gi cu

MC 06800 - GI CUMC LC

1.M T22.YU CU VT LIU22.1TIU CHUN THAM CHIU22.2VT LIU CHO GI CU N HI (gi cao su ct ban thep)32.4 NG GI, VN CHUYN V LU KHO52.5 TRNH63.YU CU THI CNG73.1TH NGHIM V MU73.2GI N HI73.3DUNG SAI83.4LOI B GI83.5LP T GI84. BO M CHT LNG95.O C V THANH TON95.1PHNG PHP O C95.2C S THANH TON9

MC 06800 - GI CU

1.M T

Phn quy trnh k thut ny a ra nhng yu cu v th tc cn thit i vi vic cung cp v lp t gi cu nh c ch ra trn bn v, cng nh c ch dn ca T vn2.YU CU VT LIU

2.1TIU CHUN THAM CHIU

Cc tiu chun sau, vi phin bn mi nht c dng tham chiu cho cc cng vic trong ch dn k thut ny.

22TCN 217 -1994 Gi cu cao su ct bn thp

AASHTO M183Kt cu thp

ASTM A36Kt cu thp cc bon

AASHTO M 163Tiu chun k thut i vi thanh thp, l thp crm-niken bn nhit v khng g

ASTM A570Thp, tm v bn, Cacbon, ln nng, cht lng kt cu

ASTM A615Thp trn v thp c g cho b tng ct thp

ASMT C881H thng keo dn b tng

ASTM D412Cao su lu ha v cao su do v vt liu n hi

ASTM D429Tnh cht cao su - S dnh cng

ASTM D518Phng php th nghim chun v ph v cao su

ASTM D573Cao su - Ph hoi trong l vi sng

ASTM D746Nhit gin ca vt liu n hi bi nn

ASTM D1149Lu ha cao su - B mt gy ha hc trong khun

ASTM D2240Tnh cht cao su - o cng

ASTM D3182Vt liu, thit b v trnh t trn nn tiu chun v chun b x l lu ha cao su.

ASTM D3183Chun b cc mu th

ASTM D3184Gi tr cao su t nhin

ASTM D3185Gi tr ca cao su qua x l bng cch pha thm vi du

ASTM D3186Gi tr ca cao su qua x l bng pha thm cc bon en hoc cc bon en vi du

ASTM D3187Gi tr ca cao su NBR

ASTM D3188Gi tr ca cao su HR

ASTM D3189Gi tr ca cao su cao phn t BR

ASTM D3190Gi tr cu cao su pha Clo CR

ASTM D3192Cc bon en trong cao su NR (cao su t nhin)

ASTM D4014Thp trn v thp dt mng cho gi cu cao su n hi

2.2VT LIU CHO GI CU N HI (gi cao su ct ban thep)(1) Tng qut

(a) Tt c nhng vt liu c dng sn xut gi lp rp phi l nhng vt liu mi v khng c s dng nguyn liu ti ch kt hp trong lp rp cui cng.

(b) Gi n hi bao gm cc m n hi dt mng hoc cc m n hi dt mng nh c ch ra trn bn v v c ghi trong ti liu ny.

(c) S thay i b dy ca mt tm dt n hi ring r nm trong phm vi tm m gi khng c vt qu 3mm v s thay i b dy ca ton b cc tm dt n hi nm trong mt m gi phi ging nh i vi mi tm thp hoc tm dt thuc kt cu. N khng thay i qu 3mm k t mt mt phng song song n mt phng y hoc mt phng nh m gi

(d) B dy ton b ca mt m gi khng c nh hn b dy ch ra trn bn v v khng c dy hn chiu dy qui nh bn v qu 6mm. S thay i b dy ton b trong mt tm m gi ring r khng c vt qu 3mm.

(e) Chiu di v rng ca mt m gi khng c bin thin ln hn 3mm so vi kch thc ghi trong cc bn v

(f) S dnh bm gia th n hi v tm thp dt phi ging nh khi th nghim mt mu v s tch lp, lc s mt dnh kt xy ra trong lng th n hi m khng phi xy ra gia th n hi v tm thp dt.

(g) Ton b dnh kt cc thnh phn gi phi c tin hnh iu kin nhit cao v chu p lc trong sut qu trnh lu ha. S dnh kt phi lin tc sut b mt, trong cc vt liu dnh kt khng c c khong h ln hn 0,25mm. Gi lp rp phi c cung cp theo cc b hon chnh t cng mt ngun sn xut.

(h) Nhng vt liu lm cho gi n hi v dng cho vic lp rp cn tun theo nhng yu cu c ch ra trong Tiu chun ny hoc theo ch dn trc tip ca T vn.

(2) Vt liu n hiVt liu bao hm gi cu phi 100% nguyn gc cao su tng hp phi p ng yu cu bng s 1. Cc tnh cht ca cao su tng hp phi c kim tra t th nghim cc bn mu p ng vi ASTM D3182 thng qua D3190 bao gm v D3192. Mt s bin thin ( 10% lc cng gin gii hn di cc tnh cht vt l c cho php khi th nghim bn mu ct khi sn phm hon thin(3) Vt liu kim loi trong giCc tm thp dt mng pha trong i vi cc tm cao su dt mng phi c cn t tm thp cc bon tun theo tiu chun ASTM A 570 hoc AASHTO N183 (ASTM A 36)

(4) Gi cao su thnh phm

- Gi cao su c c ring bit theo knh thc yu cu. Cc gc v mp c th c lm trn vi bn knh cc gc khng vt qu 9 mm v bn knh mp khng vt qu 6 mm. Tt c cc mp ca cc tm thp dt c bao ph bi lp n hi khng mng hn 4 mm v khng dy hn 6 mm. c trng ca cc lp n hi c cho trong bng di y:

Tiu chun ASTMCc thuc tnh vt lGi tr

D2240 cng60 ( 5

D412Cng chu ko, nh nht kg/cm2

gin cc hn, nh nht.%175

425

Cng chu nng

S thay i cng, im ln nht + 15

D573, 70 HR.

@ 100oCS thay i cng chu ko. Ln nht . %

S thay i gin di cc hn, ln nht . %- 15

- 40

p ln

D395.

Phng php B22 gi @ 100 oC ln nht. %35

kh ozon

D1149100 pphm kh ozon trong mt th tch khng kh, Bin dng 20%, 37.7 oC ( 1C, 100 gi kp cht

Nguyn tc D 518, nguyn tc Akhng c vt nt

Lc dnh i vi thp

D429, AS kt dnh c thc hin trong sut qu trnh lu ho 80% R(Z1)

D429, BCng lp v bc (trn cm rng)7 kg

Lc dnh i vi cu kin TFE

S kt dnh c thc hin trong sut qa trnh lu ho

D429, BCng lp v bc

Bng 2 - Cc dung sai kch thc i vi gi cao su

Kch thc bao theo phng ng ca tm cao suB dy tng cng trung bnh ca tm cao su 32 mm hoc nh hn

B dy tng cng trung bnh ca tm cao su, ln hn 32 mm-0, +3 mm

-0, +6 mm

Kch thc bao theo phng ngang ca tm cao su90 cm hoc mng hn0, + 3 mm

- Cc tm cao su dt mng phi u n, ng nht, c kh nng b tch ring r do tc dng c hc (mt nt tnh cht r rt ca cc tm n hi). Gii hn ph hoi cc hn ca gi khi chu ti trong nn khng c nh hn 140 kg/cm2. Ngoi cc yu cu ca Bng 1, mi quan h ng sut bin dng ca cc gi hon chnh nhit trong phng khng c vt qu cc gii hn di y.

Bng 3 - Gii hn quan h ng sut-bin dng ca gi cao su n hi

ng sut nn35 kg/cm256 kg/ cm2

Bin dng (Tnh theo phn trm ca tng b dy tt c cc tm n hi dt mng)5%7%

- Mt khc cng chu ct ca gi khng c vt qu 2,1 kg/cm2 i vi cng 60, bng 1 t hp 25% bin dng ca ton b b dy c hiu ca tm cao su sau 4 ngy ko di vi nhit mi trng 28oC.

- Nh thu s trnh ln T vn gim st mt h s c nh km chng nhn ca nh sn xut v n hi trong cc m gi n hi m cc th phi c cp tng ng vi ton b cc yu cu nu trn phi da trn bn ph t chng ch v cc kt qu th nghim do nh sn xut thc hin i vi cc mu n hi s c dng lm tm m gi n hi.

2.3 m thp m

(a) Dm Super-T c m thp tm m kem, s c cung cp v lp t theo ng yu cu cng vi cc ph kin km theo c ghi ch trong bn v.

(b) m s l cc thanh thp phng nhn nhi theo ng yu cu ca ASTM A615 v phi l km m nhng nong theo ng tiu chun AASHTO M111 hoc ASTM A123 hoc TCVN 7470-2005.

(c) m s c gn ti ch nh trong bn v hoc c khoan v trt va vi vt liu epoxy c chp thun.

(d) Nu m c khoan hay trt va khi cc l c ng knh t nht l 10mm ln hn ng knh ln nht ca m;

(e) Cc l s c lm sch cn thn bng nc v thi hi trc khi trt va cc tm m loi b tt c cc vt liu l d tha.

(f) Hn hp epoxy s theo tiu chun ASTM C881, loi IV hoc cc loi tng ng c chp thun, trn v s dng theo ng yu cu ca nh sn xut.

2.4 NG GI, VN CHUYN V LU KHO

Khi vn chuyn t ni sn xut, cc gi s c ng gi theo cng mt loi nhp kho, c thng, v bo v chng h hng trong qu trnh vn chuyn, do thi tit hoc bt k s ri ro bt thng no.

Mi gi hon chnh s c nhng du hiu nhn dng mt cch r rng, c bt bulng, c chng bng dy ai mt cch an ton hoc buc dy ngn nga bt k s chuyn ng tng i, v nh du trn nh ca n, v tr v hng trn mi mt kt cu trong d n ph hp vi cc bn v, phi km theo chng ch ca nh sn xut.

Khng c tho d ngoi hin trng tr khi hon ton cn cho vic kim tra v lp t.

Khi vn chuyn cng nh xp trong kho phi t gi theo ng chiu quy nh.

Tt c cc thit b v thnh phn ca gi s c ct gi trong kho ti cng trng c iu kin bo v gi di s tc ng ca mi trng v cc ph hoi vt l khc.

Khi chun b lp t gi, phi lau chi sch loi b ton b vt liu khng ph hp.

Cc gi phi c nh du r rng theo trc dc v ngang, s kiu loi v cc v tr d nh ca chng trong Cng trnh.

Nh thu phi t v c nh tt c cc gi da trn cc kin ngh ca nh sn xut v ph duyt ca K s. Kin ngh v b dy v cc loi ca b k gi v m gi phi c Nh thu trnh v c K s duyt trc khi lp t gi.

Nh thu phi trnh ln K s xin duyt mt bn bo co chi tit v cc phng php lp t cc gi cu. Mt khi cc phng php ny c K s ph duyt, chng s khng c thay i nu khng c K s ph duyt.

Gi khng c tho d. Bt c bu lng chuyn tip, bn ging hoc cc ph kin c nh tm thi khc u khng c di di cho ti khi gi c c nh ti v tr cui cng ca chng v kt cu trc tip trn gi c t. Phi thc hin cn thn m bo tt c bu lng neo, bn ging hoc cc ph kin c nh tm thi khc c tho di cui cng.

Tt c cc gi phi c t nm ngang trn c 2 hng v phi c t sao cho cc trc dc song song vi trc ca kt cu ti im , tr phi c ghi khc i trong cc bn v.

Bt c thit b no nh cc hp thp c s dng gi cc gi phng trong khi ang c c nh, phi c di di sau cng, cho cc gi ch t trn nn va.

Va phi l va khng co ngt c K s ph duyt.

Ni cc dm v cc on c sn phi c t trn cc gi n hi, ngay trc khi t tng dm v on dm trn nh gi, phi to mt lp dy va c chp nhn lin kt bt c v tr khng u no gia b mt ca dm, cc on dm v cc gi.

Cc gi phi c t vi cc dung sai di y:

Chiu cao t gi(5mm

Sai lch v hng trt(10mm

Khong cch gia tm n tm ca cc gi(5mm

nghing theo phng dc v ngang1/100

2.5 TRNH

Nh thu phi chun b v trnh T vn kim tra v chp thun theo cc iu sau:

(a) Cc chng ch ca Nh sn xut v vt liu gi n hi, trong m gi n hi s c cung cp cho tt c cc yu cu ca Ch dn k thut. Cc chng ch ny l cc bn copy kt qu th nghim ca nh sn xut v cc mu ca vt liu n hi lm m gi.

(b) Cc chng ch gi cu ca Nh sn xut tng cung cp cho cc d n khc, danh sch cc d n , nc no v m hiu gi cng nh c tnh.

(c) Bn v gi cu c thit k theo Tiu chun AASHTO, mc 18, phn II, quyn II hoc theo tiu chun tng ng c T vn cho php. Bn v phi th hin c chi tit ca gi cu bao gm c vt liu d kin s dung v chng nhn cc gi trnh c thit k p ng vi yu cu ti trng c chi tit ra trong bn v. Ch c ch to khi c T vn chp thun.

(d) Bn v thi cng v thuyt minh tnh ton tt c gi cu ph hp k hoch thi cng ch ra trong bn v.

(e) Bin php chi tit miu t th tc ng gi, vn chuyn v lu kho cc gi cu s c dng cho d n.

(f) Chi tit k hoch cho tt c cc th nghim v vt liu v cc b phn gi cu c s dng cho D n.(g) Chi tit trnh t thi cng lp t gi cu s c dng cho d n.

(h) Mt s tay chi tit v vic hng dn bo dng, quy trnh thay th, cc phng php lp t cc gi cu. Mt khi K s T vn chp thun cc phng php th cc phng php lp t s khng c thay i nu khng c s ng trc ca K s T vn. (i) Bng cam kt bo hnh sn phm

3.YU CU THI CNG

3.1TH NGHIM V MU

(1) Trc khi lp t gi vo v tr, Nh thu phi tin hnh th nghim gi t nht 1 mu cho mi loi theo cng do Nh thu lp trnh T vn gim st, Ch u t v cp c thm quyn ph duyt. (2) Th ti phi thc hin cho tt c gi c phn lc thit k khc nhau

(3) Th nghim s c thc hin ti phng th nghim c lp c K s chp thun.3.2GI N HI

(1)Th nghim nn cc gi trong mt thi gian di

Nhng gi c chn phi cht ti nn vi tr s gp1.5 ln so vi ti trng thit k ln nht trong mt thi gian t nht l 15 gi. Nu trong qu trnh th nghim, ti st xung di 1.3 ln so vi ti trng thit k ln nht, thi gian th ti cn tng thm mt khong tng ng ti trng st xung di gii hn . Gi c kim tra bng mt cui qu trnh th nghim trong khi n vn chu ti. Nu c dng phnh ra, iu cho thy rng cc tm thp dt song song v tm n hi c dung sai nm ngoi qui nh hoc dnh bm gia cc tm dt km, gi ny phi loi b. Nu c hn 3 mt nt tch vi b rng vt nt >0.08in (2mm) v chiu su vt nt > 0,08 (2mm) gi cng b loi.

(2)Cc th nghim mdun ct ca vt liu lm gi

Cc mdun ct ca vt liu gi hon thin c nh gi bng th nghim mt mu c ct ra t gi dng cc thit b v phng php m t trong ph lc A ca tiu chun ASTM D 4014 hoc theo m t ca K s T vn, th nghim cng khng ph hu c tnh so snh c th lm trn mt cp gi hon chnh. M un ct c thp hn trong khong 15% so vi cc gi tr qui nh hoc nm trong phm vi cng c a ra trong tiu chun k thut ca AASHTO cho cc cu ,iu 14.3 phn I khi khng c cc m un ct qui nh. Nu th nghim tin hnh trn cc gi hon chnh, m dun ct ca vt liu xc nh t cng chu ct o c ca gi c xt nh hng ca yu t hnh hc gi v ti trng nn n cng chu ct.

3.3DUNG SAI

Cc c tnh ca m gi n hi s phi nm trong khong dung sai cho php ca Nh sn xut. Cc dung sai ny phi c T vn chp thun trc.

Dung sai cho vic lp t gi cu:

thng hng, s sai lch ln nht so vi mt phng thng ng v nm ngang yu cu

Lp t ton b1:400

Phn thp hn ca gi so vi phn trn1:1000

S v tr:

Mt bn phn trn:3mm

Theo chiu dc6mm

Khong cch gia tim n n tim kia3mm

3.4LOI B GI

Bt c gi no m theo kt qu th nghim nu, th hin bt c du hiu sai st no nh c nu di y, phi c loi b v thay th.

(a) V hoc bin dng vnh vin b phn n hi;

(b) Rch, nt hoc bin dng vnh vin b mt;

(c) Nt hoc bin dng vnh vin ai bt hoc phn khc ca gi;

(d) Cc du hin mi mn cho thy tip xc khng bnh thng gia cc b mt kim loi ca cc tm gi hoc pt tng, v chu;

(e) Khng tho mn cc yu cu ca Tiu chun k thut ny.

(f) Cc gi b h hi trong qu trnh vn chuyn, lp t hoc cc hot ng thi cng sau cng phi loi b v thay th bng chi ph ca Nh thu.

Nh thu phi chu mi chi ph pht sinh gy ra t vic loi b gi nh cp n cc tiu mc trn.

3.5LP T GI

(a) Cc gi s c nh du mt cch r rng theo trc dc v cc trc ngang ca chng, s kiu loi v v tr nh dng trong Cng trnh.

(b) Tr khi c s chp thun khc ca T vn, Nh thu s lp t tt c cc gi trn va khng co ngt theo tiu chun ASTM C1107, Loi A. Nh thu trnh ngh v b dy gi, kiu b k gi v lp va m v phi c K s T vn ph chun trc khi lp t.

(c) Khng c tho ri gi. Khng cc bu lng, ai kp, hoc cu kin c nh tm thi khc ri ra khi vn chuyn n, tn lc gi c c nh v tr cui cng ca n v kt cu ngay trn gi c lp t. Vic bo dng phi m bo chc chn rng ton b cc bu lng, ai kp hoc cu kin c nh tm thi cui cng mi c tho d.

(d) Tt c cc gi phi c t nm ngang trn c hai hng v nh v sao cho trc dc nh du song song vi tim kt cu ti v tr t gi, tr nhng trng hp khc c ghi ch trong cc bn v.

(e) Bt c thit b no nh cc b phn bng thp dng gi cao gi trong khi c nh phi c tho b khi lp t xong, cho cc gi ch t trn lp va ca n.

(f) Trn cc gi n hi c k dm c sn v t dm, ngay trc lc t dm v t dm phi ph trn nh gi mt lp va khng co ngt cng cao c ph chun dy khc phc s khng u n trn b mt gi v dm, t dm.

4. BO M CHT LNG

(a) Gi cu s c cung cp bi nh ch to c chng nhn ISO 9001:2000.

(b) Nh ch to phi c kinh nghim trong ch to cc gi cu n hi t nht l 10 nm vi cc ti liu tham chiu cng vic chng minh chc chn v cng tc cu.

(c) Gi cu c thit k v th nghim v bn vng v lc trt theo cc yu cu ca 22TCN 272 2005 hoc AASHTO M 251 hoc tng ng c T vn ph duyt.

(d) Gi cu c th tho ri v c th c thay th vi kch kt cu ti thiu.

5.O C V THANH TON

5.1PHNG PHP O C

(a) S lng cc gi tnh bng s ca mi loi v tr lp t hon chnh v c K s T vn chp nhn. S lng cc gi tnh bng s ca mi loi v tr lp t hon chnh theo bn v khng tnh n kch c.

(b) m thp gi se c tinh bao gm trong gia cua gi.5.2C S THANH TON

(a) Khi lng c nghim thu, o c nh c qui nh trn, s c thanh ton vi n gi hp ng i vi mi n v o c cho cc hng mc thanh ton ca Biu k khi lng(b) Tin thanh ton trang tri y cho vic trang b, th nghim gi, ch to, vn chuyn, sn ph, b tr vt liu nh nhn cng, dng c, thit b v cc chi ph cn thit hon thnh cng vic theo qui nh v ton b cc ph kin cn thit c ch ra trong bn v. Vic thanh ton cng bao gm c phn thanh ton cho cng tc chun b, sn xut, vn chuyn sn ph v lp t tt c cc thanh m bng thp m. Nu cc ming m c khoan hay trt va th th vic thanh ton cng bao gm c chi ph cho cc dng c, vt liu ph cho cng tc khoan hoc lm sch l khoan m, va epoxy cng nh vic t hp l cc tm m v trt va.

Ghi ch: Cc ni dung khc cha c cp trong ch dn k thut ny, trc khi trin khai thi cng bt k mt hng mc no, Nh thu c trch nhim trnh K s ph duyt tt c cc ti liu v cc vn lin quan.

Xy dng cc cu trn tuyn ng Ha Phc Ha KhngTrang 4 / 9