泉州晋江大桥斜拉桥主梁施工

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1、泉州晋江大桥斜拉桥主梁施工杨奉举81文章编号：1003—4722(2010)05—0081-04泉州晋江大桥斜拉桥主梁施工杨奉举(中铁大桥勘测设计院有限公司，湖北武汉430050)摘要：泉州晋江大桥主桥为(200+165)m独塔双索面预应力混凝土斜拉桥，主梁横断面为双波浪形箱梁。该桥主梁采用普通挂篮对称悬臂施工，挂篮底平台刚度大，外模采用整体钢模，内模采用拆装式模板；0号节段采用水中支架分段施工，并设置后浇段；梁上张拉斜拉索。为加快施工进度，增加了主跨支架现浇长度，使主跨与边跨同步对称合龙。同时，在桥塔中横梁施工完后，设置安全

2、隔离装置，实现塔、梁交叉施工。在悬臂施工过程中，主梁横梁底部施加临时体外预应力，2号节段施工时设置临时反拉梁。主梁合龙时，在合龙口每个箱内设置三榀体外桁架式劲性骨架，并加强合龙口处的支架以抵抗合龙后主梁的反力。关键词：斜拉桥；预应力混凝土结构；箱形梁；施工方法；桥梁施工中图分类号：U448．27；U445．4文献标志码：AConstructionofMainGirderofCable-StayedBridgeofQuanzhouJinjiangRiverBridgeYANGFeng-jU(ChinaRailwayMajorBr

3、idgeReconnaissance&DesignInstituteCo．，Ltd．，Wuhan430050，China)Abstract：ThemainbridgeofQuanzhouJinjiangRiverBridgeisaprestressedconcretecable—stayedbridgewithasinglepylonanddoublecableplanesandwithspanarrangement(2OO+165)m．ThecrosssectionofthemaingirderoftheBridgeisde

4、signedasadual—waveshapeboxgirderandthegirderisconstructedbythecommonformtravelerbythebalancedcantilevermethod．Therigidityofthebottomplatformofthetravelerisgreat，theexternalformworkthereofistheintegralsteeIonewhiletheinternalformworkiSthedetachableone．ThesegmentNo．0i

5、scastinsectionsOnscaffoldingstandinginwaterandthesuccessivesegmentstobecastareprepared．Thestaycablesaretensionedatthegirder．Tospeeduptheconstruction，thelengthofcast—in—situonscaffoldingforthemainspanisincreasedinordertoensurethatthemainspanandsidespancanbeclosedinsa

6、mestepandinasymmetricway．Moreover，aftertheconstructionofthemiddlecrossbeamofthepyloniscompleted，thesafetyisolatingdevicesareinstalledandthustheparal—lelconstructionofthepylonandgirdercanberealized．Intheprocessofthecantileverconstruc—tion，thetemporaryexternalprestres

7、singisappliedtothebottomofthecrossbeamsofthemaingirderandatthetimethesegmentNo．2isconstructed，thetemporarycounterpullbeamsarear-ranged．Beforethemaingirderisclosed，threeexternalstiffeningskeletonsoftrusstypearesetineachboxattheclosuregapandthescaffoldingattheclosureg

8、apisreinforcedtoresistthere—actionforcefromtheclosedgirder．Keywords：cable—stayedbridge；prestressedconcretestructure；boxgirder；construction