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时间:2019-05-11
《安庆长江铁路大桥主桥上部结构施工关键技术》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、桥梁建设2013年第43卷第2期(总第219期)BridgeConstruction,Vo1.43,No.2,2013(TotallyNo.219)33文章编号:1003—4722(2013)02—0033—07安庆长江铁路大桥主桥上部结构施工关键技术汪水清,刘爱林(1.宁安铁路有限责任公司,安徽芜湖241000;中铁大桥局宁安铁路安庆长江大桥工程指挥部,安徽安庆246008)摘要:安庆长江铁路大桥主桥为主跨580m的空间三索面钢桁梁斜拉桥,主粱采用3片主桁的钢桁架结构,桥塔为钢筋混凝土结构,高210m。根据该桥非对称三主桁、超高塔、三索面的特点,钢桁梁采用散拼法架设
2、,无索区6号至7号墩间钢桁梁在膺架上拼装架设,6号至5号墩间钢桁梁采用悬臂架设有索区钢桁梁除墩顶4个节间采用浮吊散拼架设外,其余均采用悬臂架设;全桥设2个合龙口,采用“长圆孔+圆孔”合龙铰技术,先中跨后边跨合龙。桥塔中、上塔柱采用爬模施工,采取塔梁同步施工技术,索道管分两阶段(在地面平台上将索道管与劲性骨架组装、初调,在塔上微调)进行精确定位。该桥已于2O12年12月12日成功实现了全桥钢桁梁多点精确合龙。关键词:斜拉桥;大跨度桥;索道管;钢桁梁;散拼法架设;桥梁施工中图分类号:U448.27;U445.4文献标志码:AKeyTechniquesforConstruc
3、tionofSuperstructureofMainBridgeofAnqingChangjiangRiverRailwayBridgeWANGShui—qing.LIUAi-lin(1.NinganRailwayCo.,Ltd.,Wuhu241000,China;2.ConstructionHeadquartersofAnqingChangjiangRiverBridgeonNanjing-AnqingRailway,ChinaRailwayMajorBridgeEngineeringGroupCo.,Ltd.,Anqing246008,China)Abstract
4、:ThemainbridgeofAnqingChangJiangRiverRailwayBridgeisastee1trussgirdercable—stayedbridgewithspatialtriplecableplanesandwithamainspan580m.Themaingirderofthebridgeisthetrussgirderstructureconsistingof3maintrussesandthepylonsaretherein—forcedconcretestructures,eachbeing210mhigh.Inthelightof
5、thecharacteristicsoftheasym—metricthreemaintrusses,veryhighpylonsandtriplecableplanesofthebridge,thetrussgirderwaserectedbythepiece—by—pieceassemblingmethod,ofwhichthegirderformPierNo.6toPierNo.7intheareawithoutstaycableswasassembledanderectedonscaffolding,thegirderfromPierNo.6toPierNo.
6、5waserectedbythecantilevermethodandforthegirderintheareawithstaycables,withtheexceptionthatthe4panelsofthegirderatpiertopwereassembledanderec-tedbythefloatingcrane,therestofthegirderwaserectedbythecantilevermethod.Thereweretwoclosuregapsdesignedforthegirderofthewholebridge,thegirderwasc
7、losedinthese-quenceofthecentralspanfirstandthesidespanlate,usingthetechniqueoftheclosurehingeof”slottedhole+roundhole”.Themiddleanduppercolumnsofapylonwereconstructedbytheclimbformwork,usingthetechniqueofsynchronousconstructionofthepylonandgirder.Thecableductsinapylonwereaccura
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