ONG DUNG CONG NGHE TYFO® FIBRWRAP®
TRONG SUfA CHUfA KHAN CAP BAN MAT CAU BTCT DAM BAD GIAO THONG
TS. LU-QNG X U A N BINH, THS. VU VAN T H A N H TS. TRjNH MINH HAI, THS. DO XUAN Q U ?
SO mOn SCfC B6n V$t Li$u, Trwifng D^i hpc Giao thdng V$n U ONG WEE KEONG
FYFEASIA. Singapore
Tdm tit: C6ng ngh0 Tyfo® Fibnvrap® /d cdng ngh$ v$t li$u composite vd'i nhiSu wu (fiim n6i b^t nhw: ch4t kSt dinh Epoxy Ikm vi$c tin c$y, c6 thi dp dyng cfupc cho diSu i<i0n thi cdng phCrc t$p md c6c v$t li$u composite truySn thdng khd thi/c hi$n duiyc nhw ddn tr§n b4 m$t c6 d'O im cao, ddn tn/c tiSp trong mdi truing nutfc. Ttrong ph^m vi nghi&n c&u ndy, nhdm nghi§n cu-u ti4n hdnh nghi§n cuv thin khai Cmg dyng cdng ngh$ Tyfo® Fibnfl/rap® vdo st/a ctiira bdn m$t cSu BTCT trong thi/c ti. Phdn tich d0c diim cdng ngh$, ddnh gid hi$u qud cua cdng ngh$ ndy dS du^c thi^x: hi$n vd trinh bdy trong bdi bdo ndy Abstract: Tyfo® Fibrwrap® Technology is a composite technology with a number of dominant points such as epoxy with high strengths of bonding, being able to install in complicated conditions (high humidity or underwater). In this paper, the authors conduct research work on applying Tyfo® Fibrwrap®
Technology to repair/strengthening of reinforcement concrete slabs of a bridge in reality. Analysis of technology features, evaluation of effictiveness of this technology are demonstrated and illustrated in this paper.
1.DATVANDE
Doi voi cbng tac quan ly bao tri, khai thdc cac cbng trinh d u duang a nu'b'c ta hiOn nay dang dOng tru'oc bai toan Idm t h i nao d l sOa chOa, tang cu'b'ng cho cac d u y l u ma v l n dam bdo giao thbng trong hp thing m^ng lu'b'i du'b'ng. Ddy Id bdi todn khb ddc bipt Id dli vb'i cdc tuyin du'ong QuIc Ip vbi dp lye lu'u thdng xe cO tren tuyin Id rit Ib'n. Nhilu giai phdp truyen thing dd vd dang du'oc dp dgng rOng rdi 6k sOa chOa, ting cu'b'ng cho cdc cbng trinh d u y l u nhu-: cdng dy Ong lye ngodi [1], ddn bdn th^p [2], xdy dyng trg tam, xdy dyng th§m lap ban bb tbng c6t th6p m$t d u , lap ddt them kit d u chju lye phg trc cho kit d u nhjp [3]... Trong 66 nli b^t han ca Id giai phdp sOa ehOa, tdng cu'b'ng kit d u d u
bIng vdt lipu composite (spi thuy tinh ho^c soi cdc bon lam vipc cung keo Epoxy) cb t h i k l den nhu'! cbng trinh sOa chi>a d u Trin Thj Ly a Dd Ning, c l u Lli a Nghp an. Tuy nhibn do hgn c h i v l d0c tinh CO hpc cua vdt li$u vd giai phdp cbng nghp chi phu hp-p trong dieu ki^n thi cbng vol dO I m du-di 4%. Trong nghibn cOu ndy, cdc tdc gid dd nghibn cOu Ong dyng mOt cbng nghO sO dyng vdt li$u composite, cbng nghO Tyfo®
Fibrwrap®, h i trp' hi§u qud cho cbng tdc sOa ehOa, tdng cu'b'ng kit d u c l u nbi chung, d u y l u nbi ribng d l dam bao giao thbng.
2. GlOl THIEU C 6 N G NGHE TVfo® Fibrwrap®
Tyfo® Fibrwrap® Id nhu'ng polymer du'O'c tgo thdnh bIng cdc elt liOu sp-i cu'b'ng dO cao (sp-i
thuy tinh, sp^i cdc bon vd Aramid) kit hop vb'i keo Tyfo® Epoxy tao thdnh vdt li|u composite cb trpng lu'p'ng nhp, cu'b'ng dO cao Ong dyng cho t i t ca ode ngdnh if^
thudt vb'i mgc dich tdng cu'b'ng va bao vO kit c l u : bb tbng cot th^p, bb tbng cit th^p dy Ong lye, ggch dd xdy. kit d u thep vd kit clu gl.
Vdt ti$u Tyfo® Fibrwrap® c6n cb kha ndng tdng cu'b'ng khang chin rIt hi^u qua va dd dirpc minh chOng trong cdc tr§n ding d i t Ib'n tgi Ddi Loan, Los Angeles, Seattle. Salvador, Nh$t Ban, Indonesia vd Trung Quoc. Ngoai tinh ndng u-u vipt Id tang cu'b'ng kha ndng chju lye cho cbng trinh, h$ thing Tyfo® Fibrwrap® con bao ve kit c l u trong mbi trobng xam thyc. giam thilu cdc tdc dOngdochdy, n6...
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S6 6 ndm 2012 |KHOA HOC - C O N G N G H ? a0Bk
HO thing Tyfo® FibnAfrap®
du'oc thi cbng rat dan gidn vd hodn toan thu cbng. Nhb' trpng lu-png nhp, d l ddng thi cbng, khbng phai phd bo, khoan d y vdo kit d u hi^n hOu d l tgo \\hx\ kit giOa v^t lipu gia cu'b'ng vd vdt liOu CO bin, h^ thong ndy cb nhieu u'u diem la khbng yeu clu cdc thilt bj thi cbng n$ng, cdc thilt bj thi cbng chuyen dgng. 06 t h i thi cbng nai khbng gian cung nhu* diOn tich nhb hep, khbng ngOng tho'i gian khai thdc cbng trinh trong giai doan sOa chOa. Cb t h i thi cbng trong dilu kiOn dO I m cao, th^m chi Id cb t h i thi cbng tryc tilp trong mbi trubng nu-bc
Nha cdc d^c dilm nbu trbn ma hO thing ndy Id giai phdp phu hyp cho d o cbng trinh d n tiln dO thi cbng nhanh (thdm chi Id khIn dp), khbng anh hu'ong den sy khai thdc lien tyc cua cbng trinh.
3. ONG DUNG CONG NGHE TYFO TRONG SUTA CHJJfA KHAN CAP CAU TRANG, km 2 9 + 9 1 2 QL38B. TINH HUNG YEN 1.1. Tinh trang cSu Trdng thing 9 nam 2011
c l u Trdng nam tren tuyen quoc 10 38B dang du'oc ndng d p noi hai tinh Hu-ng Ybn vd Hal Duang, tgi Km 29+912 thupc dia phdn huypn Phu CO, tinh Hu'ng Y§n. c l u du'oc xay dyng ndm 1982 voi tai trpng H13, gim 3 nhjp gian don chieu dai 12 met, dam thep Hen hpp ban BTCT, mdt cIt ngang c l u gom 5 d i m chu 155, vol b l rong d u 7m, 2 le bO hdnh 2 bbn mbi ben rOng Im. Mo d u bIng BTCT dat trbn bb mbng gIm 2 hdng cpc dbng, m5i hdng 4 coc vubng 35cm x 35cm; Cdc ' tru clu lam bang BTCT, xd mQ d§t
trbn 2 cOt du'b'ng kinh 60 cm.
Trai qua 30 ndm khai thdc, vb'i dieu kiOn tdi trpng thilt k l HI 3, nhu'ng trbn thyc t l tai trpng khai thdc Id H30, c l u Trdng dd xuing d p nghibm trpng vd bi xip hgng Id d u ylu vbi gib'i h^n tdi trpng khai thdc Id 8 tin.
Bdn m$t c l u bj hu'ng hbng nUng, quan sdt tO phia du'bi, bdn mdt d u xult hi^n nhilu vlt nOt vd cb tinh h? thing vd b l rOng khd Ibn, bdn bd tbng c6t thbp dd mIt tinh l i l n k h l i (Hinh 1).
D i n dIu thdng 9/2011, ban m§t clu trbn nhip phia Hai Du'ong bj not nghibm trpng va cb nguy CO sdP- c l u Trang d n ngOng khai thdc 6e sOa chOa bdn mdt cau, giao thbng tren tuyin huylt mgch QL38B dOng tru'b'c nguy ca ngu'ng trp trong khoang thai gian dai, cb t h i gay anh hu'ong Ib'n din ddn sinh, kinh t l dia phu'ong nbi ribng cua kinhtl vung nbi chung.
Bdi todn dat ra Id d n nghibn cOu ap dung giai phdp sOa chOa/
tdng cu'b'ng d u Trdng khan d p dam bdo giao thbng tren tuyin huylt mach QL38B sac cho: Ddp Ong day du cdc yeu clu kinh t l - ky thuat; Khbng ngOng lu'u thbng tren tuyin; Thb'i gian thi cbng ngan.
1.2. Pnan tfcli so sanh vd lua chon glal plidp sura diOa tang cilOng clu Trdng
Phuong dn 1: Thay ban m$t d u mbi
Mb ta chung: R& bb ban mdt d u cQ, do l^i ban mgt clu mai.
U'u nhu'p'c dilm'
+ U'u diem: Khic phyc mpt each triOt d l cac hu* hbng cQng nhu- chit lu-cng thip cua be tbng ban mdt d u .
I H i n h l .
Nij't vCT ban mat BTCT c^u Trang.
+ Nhu-ac dilm. thai gian thi cbng lau, phai ngOng lu'u thbng xe trbn cau, ton k^m do phai Idm clu tam phuc vu cbng tdc sOa chOa
Kinh phi dy kiln. 3,1 tl dong (chu'a k l thipt hgi gidn tilp do ngOng lu'u thbng xe tren d u ) .
Phu^ng dn 2. D l thbm ban BTCT tren mat clu cu
Mb ta chung: Do thbm mOt lap be tbng ban mat clu cb cot thep vbi chilu day 15cm Ibn tren mgt d u hipn tai.
U'u nhu'pc dilm.
+ U'u dilm: tai trpng se tac dyng Ibn lap be tbng ban mai do, phdn b l lai vao Ibp bdn m$t d u cu rli tdc dgng xuong dam.
Gidi phap ndy khIc phgc tu-ong doi triet d l hu'ng hbng cua ban mdt d u So vai phu'ong phap thay ban mdt d u thi phu'ong phdp nay se tilt kiem du'oc thdi gian thi cbng, vi khbng phai ddp bb lop bb tbng ban mat d u cu
I S6 6 nam 2012
mvm\
# # # # # KHOA HOC - CONG NGHE
Vd Cb t h i thi cbng du-pc khii lu'p'ng Idn, trong thb'i gian ngin + Nhu'p'c dilm: gilng vb'i
phu'ong phdp thay bdn m$t d u mbi, vIn phli d m d u trong qud trinh d l bb tbng vd khoang thb'i gian du cho bb tbng dgt cu'b'ng dO chju lye;
tdng thbm tTnh t l i cho clu.
Kinh phi dy kiln: 2,7 ti ding.
Phuxyng dn 3: Ddn vdi spi thuy tinh
Mb ta Chung: Bb tbng bj nOt vQ ducc khbi phgc tinh liln khIi bIng biOn phdp bam keo vdo cdc vlt not. Tgi khu vyc ban chju kbo, bb tbng du'O'c gia cu'b'ng bIng cdc I6p vai spi thuy tinh vd keo Epoxy.
Lb'p vdi spi thuy tinh vd keo gia eu'bng giup: tdng kha ndng chju keo khi uon vd tdng do cOng cho bdn; bao vO elt thbp khbng bj xdm thyc; ehing tham cho ban m|t d u .
U'u nhu'p'c dilm:
+ U'u dilm: Ddp Ong du'oc day du cac yeu d u ky thu^t cua cbng tdc sOa chOa gia cu'b'ng kit clu ban; hlu nhu- khbng tdng them tTnh tai cho d u ; thi cbng don gian, nhanh gpn;
khbng phai ngOng lu'u thOng xe tren clu trong suit qud trinh thi cbng sOa chOa.
+ NhLFOC dilm: bj hgn chi trong mOt s i dilu ki$n eg t h i nhu'.
hiOu qua gia cu'b'ng khi ndng chong d t cho ban khbng cao;
khbng hiOu qua ho^c hiOu qua thIp tai nhOng vj tri bin chj nbn khi uln.
Kinh phi dy kiln: 1,7 ti ding Ket lu$n: Quan phdn tich u-u nhu'p'c dilm vd d$c dilm kinh t l - ky thudt cua tOng phu'cng dn.
kiln nghj lya chpn Phu-ang dn 3 - Ddn v l i syi thuy tinh d l sOa chOa tdng cu'b'ng bdn BTCT m$t d u Trdng. Trong db v$t liOu vd cbng nghO Tyfo dyyc lya chpn d l triln khai.
1.3. Thi cftng sura chfia bdn BTCT cSu Tring bling vdt Il6u vd cfing nghft TVfo®
1.3.1. Xi>lyfb§ tdng chSt lu-q/ng th&p vd vit nirt trong bdn BTCT
Tiln hdnh dgc bb cdc phin bb tbng dd bj om v& vgn vd bb tbng chit lu'png thIp. Trdm vd cdc vj tri l l ring, cdc phIn bb tbng bj lo$i bb, bjt v l t not bIng vOa khbng co ngbt eu'bng dO cao (Hinh 2). Bom keo ehuybn dgng bdo hba cdc v l t not trong bin BTCT (Hinh 3).
1.3.2. XCfl^ b6 m$t bdn BTCT Tiln hdnh mdi b l m$t ban BTCT tgo phlng. Voi nhOng khu vyc cb dO bIng phang khbng cao, sO dgng vOa khbng co ngbt cu'b'ng dO cao cua Sika de trdt t^o dO bIng phang tuang doi, sau db sO dgng may mdi 6e t^o phlng hodc sao cho be m$t cb dO l l i Ibm nho.
Trong phIn Ib'n d c tru-bng hyp, cb t h i si> dgng mdy mdi d m tay d l t^o cdc b l mdt ddp Ong ylu d u dinh bdm.
Tgi cdc vj trI cb cdc gbc cgnh phli du'O'c vult trbn v6i mO* bdn kinh ndo db tru'b'c khi tiln hdnh tdng cu'b'ng clu ki$n db bIng vdt liOu Tyfo sao cho trong mpi tru'b'ng hyp v$t liOu Tyfo khbng du'yc bj bd gly vdi gbc 90°. Cb t h i t^o bdn kinh cong trbn cdc gbc vdt cgnh bIng cdch dCing bay cb mdt lu'yn trbn de chdt vdt liOu keo Tyfo® S, cOng cb t h i bIng cdch dCjng hO thing mdy mdi d m tay, ho^c cQng cb t h i kit hyp sO
dgng Ing I6t vd nhli v§t liOu keo Tyfo® S. Thbng thu'b'ng, ybu cau bdn kinh cong t l i thilu Id 2cm.
Phgm vi b l mdt ban BTCT can ddn spi thuy tinh d n difpc lam sgch bIng khi nbn, chli tay ho|c bam.
1.3.3. ChuSn bi vdi 5(H OiOy tinh vd keo ddn
V l i syi thuy tinh du'px; cdt thdnh nhOng manh cb kich thi/ac nhIt djnh du-pc chi djnh theo thilt k l hodc ddm bao vi$c thi cdng ddn syi Ibn b l m$t ban BTCT du'O'c thudn tibn.
TrOn thdnh phIn A cua keo Tyfo® S vdi thdnh phIn B vdi ham lu'p'ng du'O'c do lu-dng theo t^ le.
100 thdnh phIn A vdi 42 thanh phIn B nlu do lu'dng theo tiie tich vd 100 thdnh phIn A vdi 34.5 thdnh phIn B nlu do lu'dng theO trpng lu'p'ng. Cdc thdnh phIn cOa keo epoxy du'oc trOn bIng m^y trOn cho d i n khi hin hyp difcc trOn dIu. Thbng thudng thdi gian trOn la 5 phCit trong trudng hypt^c dO trOn Id 400-600 vbng trbn phiit
S6 6 nam 20121
KHOA HOC - CONG NGHE B'^k
1.3.4. Qudt I6p keo I6t vd tam keo cho sq/i thuy tinh
SO dung con lan hodc bay xay chdt mOt Idp keo lot Tyfo® S trbn b l mdt kit d u d n tdng cu'dng (tli thilu 2 milimet) Dyi cho Idp keo Ibt dgt trgng thdi bit dIu dinh bdm, nbi chung t6i thilu 1 gid (Hinh 4).
Thim ddm bao hba vai syi bIng keo Tyfo® S theo khuyin d o cua nha san xult. ViOc ndy cb t h i thyc hipn bang tay (Hinh 5) cho cdc cbng trinh nhb, ho^c cb t h i sO dgng mdy Tyfo® Saturator.
1.3 5 Ddn sy/ thuy tinh vdo bi m0t ban BTCT
Ddn Idp vai syi bdo hba keo vdo be mgt be tbng bIng tay (Hinh 6), dung bay vult ep d l dam bao t i t d moi khoang tring va khi du'oc Ioai bb. Khodng trIng giOa cdc dai vai spi ch^y song song vdi sol ca ban khbng dupe vu-yt qua 1,3cm b l rOng trO khi cb chi ddn khdc trong ban ve thilt k l Chieu ddi phIn gli len nhau giOa cac dai vai syi theo phu'ong cua syi co ban yeu clu t l i thilu 15,25cm trong mpi tru'dng hyp.
Tham van ngu'di chi dgo thi cbng tai cbng tru'dng cho d e dieu kiOn cu t h i cua cbng trinh.
Tiln hdnh phit Idp keo Tyfo®
S vd ddn Idp vai syi bdo hba keo tilp theo mOt d c h libn tyc hodc nli ghep, cho d i n khi dam bao du so Idp theo thilt ke.
1.4. Ddnh gia hifiu qui siiia cliila tang cudng cau Trdng
De ddnh gid hiOu qua cua cbng tac sOa chOa, ting cu'dng d u Trang, cbng tdc kilm djnh danh gid ndng (yc chju tai cua d u Trdng da doyc thyc hiOn tru'dc va sau khi sOa chOa vdi d p tai trpng
HIS, kilm djnh ddnh gid ndng lye chju tai cua d u Trdng sau khi sOa chOa vdi d p tai trpng H30
V l mdt cu'dng dO:
+ Khi xIp tdi trpng H13, Ong suit kbo Idn nhIt tgi ban cdnh dudi cac dim chu khi chu'a sOa ChOa Id 335,3 daN/cm2, sau khi sOa chOa/tdng cu-dng cbn Igi 140 daN/cm2, gidm 58%.
+ Khi xIp tai trong H30, d u sau khi sOa chOa, Ong suit kbo Idn nhIt trong cdc dim chu Id 160 daN/cm^ (nhb hon cd khi clu chu'a sOa chOa chju t l i H13).
+ U'ng suit nbn Idn nhIt t?i ban cdnh trbn cdc dim chu khi chu'a CO sOa chi/a, thO vdi d p tai H13 Id 93 daN/cm2. Sau khi clu dupe sOa chOa thi Ong suit Idn nhatkhi thO vdi cap tai HI 3 Id 59,7 daN/cm2, va Id 80daN/cm2 vdi d p tai H30.
+ Sau khi sOa chOa ban m^t d u da t h i hien tinh lien khIi, ban lam vipc dung so do chju lu'c cija no. Theo phu'ong ngang d u ban bj kbo phia du'di, lam viec theo mb hinh ban kb tren hai canh.
Theo phu'ong dpc d u ban trd thdnh ban cdnh tren cua dam chu, du'dng trung hba nim ngay sdt vut nbn khbng cb biln dgng theo phuang dpc d u . Biln dgng ddy ban theo phu'ong ngang d u nhb, Ong suit kbo Idn nhat 6,6daN/
cm2 ndm trong gidi han cu'dng dO chju kbo cho phep cua bb tbng.
Kit Iudn v l m$t cu'dng dO:
l^ng suit trong cdc dim chu giam rb rbt sau khi du-yc sOa chOa - tang cu'dng; bb tbng ban mdt d u dd Idm vipc liln khoi nhu' mOt t h i thong nhat; sau khi sOa chOa, kit clu nhjp Idm vibe an todn vdi t l i trong H30.
v l mdt dO eOng-
+ Dp vbng Idn nhIt trong cdc dim chO giam ro rbt so vdi khi chu'a sOa chOa/tang cu'dng.
+ DO vbng Idn nhIt khi xIp tai H13, khi chu'a sOa chOa la 4,16mm, sau khi sOa chOa con 3,375 mm, giam 18%:
+ Khi xIp tai H30 tren d u sau khi sOa chu'a, dO vbng Idn nhIt (Xem tiip trang 55)
I So 6 nam 2012
DIEN DAN DOANH NGHIEP VA BAN QUAN LV DU" AN # # # # #
Mgt khdc, Vinalines eung h i trp- nguon tdi ehinh khbng nhb va thu tyc phdp ly d l giai quyet cde vy tranh chip tgi nude ngodi dli vdi cdc tdu cua Vinashinlines.
Tuy nhidn, Vinalines eung thing thin thua nhgn ring cb nhdng nguydn nhdn chu quan din tdi vigc kinh doanh thua l6 trong giai dogn ndy. Thd nhlt. sy yeu kdm trong dy bao thj trudng tgi giai dogn phdt trien nbng dd din tdi hidu qua diu tu thIp, kha ndng thanh todn cua dbi tdu yeu trong khi nhilu dan vj cua Vinalines vdn nbng vOi phdt triln nhanh dbi tdu, khiln dOi tdu ehi cb Iupng md it cb chit. Thu hai, mb hinh t l chdc cbn nhilu bit cdp khiln cbng tdc quan ly, kilm tra giam sdt chua dupe trigt d l . chat
che, tinh trgng jdng phi xay ra.
Vdi nhdn dinh ndy, Vinalines da gidi trinh vdi BO Giao thbng Vdn tai v l k l hogch diu tu dOi tdu, trong db se khbng su dyng ngdn sdch Nhd nude d l diu tu md huy dOng tu ode nguIn v6n vay thuang mgi, vOn huy dOng trdn thj trudng chdng khodn vd vin ty eb. Thyc hidn phdt triln dbi tdu Id nhidm vy thilt ylu 6i dly mgnh ngdnh hdng hdi quie gia, bdi vdy Vinalines se vin tilp tyc c l ging diu tu sdu, rOng vdo dbi tdu eua minh, cy t h i trong giai dogn 2011- 2015 se mua 29 tdu mdi vd tdu cQ, giai dogn 2015-2020 tdp trung dbng mdi vd mua tdu nbi dja, dua ting trpng tai dbi tdu chilm 44%
todn quIc. Tuy nhien, d l trdnh ddu tu nbng vpi, khbng hidu qua,
Vinalines se dly manh cbng tde sip xIp, doi mdi mb hinh to chuc de khdc phyc cde ylu kdm, tin tgi trong thdi gian vua qua. Mgt khac, tien hdnh tdi ca clu cdc doanh nghipp, dy an dang thyc hign d l trdnh tinh trang diu tu ddn trai nhlm tdp trung phdt triln vi>ng mgnh cdc ITnh vyc ea ban, chu ylu, dong thdi tdng cudng cbng tde nhdn sy. ndng cao trinh db cdn bb cbng nhdn vidn 6k phdt trien Ting cbng ty v l mdt Idu ddi.
Ld doanh nghidp blu tdu eua todn ngdnh Hdng hai cd nude, Vinalines da nhdn thdc dupe nhung ton tai, ylu kem trong thdi gian qua vd dang tung budc khac phuc d l trd lai vj tri vin cb cua minh trong kinh te van tai biln Viet Nama
HHG D U N G CONG NGHE TYFO« FIBRWRAP*.,
(Tiip theo trang 10) cua dam la 4,06 mm nam trong pham vi cho phdp cua quy trinh ( [f] = 30 mm).
VimdtdaodOng:
+ Hd s i xung kich khi xe vao d u tren edc nhjp diu giam, trudc khi sua chua hd s i xung kich Idn nhlt Id 1,24, sau khi sua xong he s i xung kich Idn nhat tren toan clu chi cbn 1,13.
+ Tin so dao dOng theo phuang thing ddng cua cdc dim trdn cde nhjp deu tdng, tardc khi si>a chda tin s i trung binh f = 5,7 Hz, sau khi sua chda tan s i trung Wnh tang Idn f = 10,1 Hz. Dilu ndy chdng to 66 cdng eua d u tdng len ddng k l sau khi sua chua.
4. KET LUAN
v l mdt ky thugt: Cau Trdng sau khi sua chua tdng cudng khai thdc an todn vdi tai trong H30.
v l mdt cbng nghg: Nhbm nghien cuu da dng dyng thdnh cbng cbng nghg Tyfo® Fibrwrap®
vdo sua chua tdng cudng kit d u ban be tbng cot thdp da bj hu hbng d mdc dO nghidm trpng, b l sung thdm mOt giai phdp sua chua tdng cudng cbng trinh d u hidu qud. ddc bigt Id khbng phai ngdng luu thbng xe trong qud trinh thi cbng sda chua.
v l mdt hidu qua kinh t l : Cbng nghd sua chua tdng cudng d u bing ddn vai spi cudng dO cao cho phdp giam chi phi tryc tilp so vdi cdc phuang phap sua chda tang cudng kit d u clu truyin
thing. Ngoai ra cbng nghe ndy cbn cho phep giam thilu chi phi gidn tilp do khbng phai ngung luu thbng xe trong qud trinh thi cbng sua chua. Thdi gian thi cbng ngdn cung Id mOt hieu qua kinh t l dang ke cua cbng nghd naya
TAI LIEU THAM KHAO [1] Nghien cuu ung dyng cong
nghe dy Ung Iyc ngoai tang cu'b'ng cac cau be tSng dy dng Iyc trong dieu kien dam bao giao thong, Nguyen Ngpc Long, Tgp chi Khoa hgc Giao thflng, 2010
[2]. Nghien cUu hoan thien cong ngh$ dan ban thep trong sua chua va gia c6 c l u BTCT tren duong B$, dk tai cap BQ (GTVT) cua GS TS Nguyin Viet Trung, 2005.
[3] Thiit ke va che tgo mgt s6 thi4t bj chuyen dung phyc vy sOa chua nang cdp edu be tong d Viet Nam, 6k tai cap Bp (GTVT) cua Nguyin Xuan Khang, 2005.
j S6 6 ndm 2012
