四线曲线钢箱梁斜拉桥施工控制技术

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1、桥梁建设2013年第43卷第4期(总第221期)BridgeConstruction。Vol。43，No．4，2013(TotallyNo．221)文章编号：1003—4722(2013)04—0116—07四线曲线钢箱梁斜拉桥施工控制技术谭康荣，余昆(1．贵广南广铁路广州枢纽工程项目部，广东广州510380；2．中铁大桥局集团桥科院有限公司，湖北武汉430034)摘要：为了使曲线钢箱梁斜拉桥成桥后达到合理的内力和线形状态，以穗盐路斜拉桥为背景，基于无应力状态法，以钢箱梁制造线形为目标，进行全桥施工控制。在确定合理成桥状态下，计

2、算了钢箱梁的制造线形，悬臂拼装时按制造线形夹角进行拼装，并保证合龙段的无应力拼装，则最终成桥必会达到合理成桥状态；讨论了无应力索长的计算方法，用无应力索长差实现全桥调索的一次性完成；该桥的横向效应计算结果表明水平横向弯曲效应明显，弯扭耦合效应并不明显，可按直线桥对主梁进行线形控制。监测结果表明，成桥后索力误差在5之内，主梁线形满足设计要求，结构内力状态良好。关键词：斜拉桥；曲线梁；钢箱梁；悬臂拼装；无应力状态法；有限元法；gg：r_控制中图分类号：U448．27文献标志码：AConstructionControlTechniqu

3、esforFour-TrackCurvedSteelBoxGirderCable·-StayedBridgeTANKang—rong，YUKun。(1．Secti0nofGuangzhouTerminalConstructionProjectofGuiyang—GuangzhouRailwayandNanningOuangzhouRailway。Guangzhou510380，China；2．BridgeScienceResearchInstituteLtd．，ChinaRailwayMajorBridgeEngineering

4、Group，Wuhan430034，China)Abstract：Toensurethatthecurvedsteelboxgirdercable—stayedbridgecouldmeetthera—tionalinterna1forceandgeometricshapestateafterthebridgewascompleted，theSuiyanRoadCable—StayedBridgeofthesimilarkindwascitedasanexampleandtheconstructioncontrolotthewh

5、olebridgeofthebridgewascarriedoutinconformitytotheunstressedstatemethodandbytakingthemanufacturinggeometricshapesofthesteelboxgirderofthebridgeasthetarget．Undertheconditionthattherationa1completedbridgestatewasdetermined，themanutacturinggeometricshapesofthesteeIboxgi

6、rderwerecalculatedandatthetimeofthecantileverassemb—ling。ifthegirdercouldbeassembledaccordingtotheincludedangleso{themanufacturinggeo—metricshapesandtheclosureblockcouldbeassembledundertheunstressedcondition，thefinalbridgewouldbeboundtomeettherationalcompletedbridges

7、tate．Thecalculationmethodsfortheunstressedlen【gthofthestaycableswerediscussedandtheunstressedcablelengthdifferenceswereusedtocompletetheadjustmentofthecableforcesofthewholebridgeinonetime．Thecal—culationresultsofthetransverseeffectofthebridgeshowedthatthehorizontaltr

8、ansverseben—dingeffectwasobviouswhilethecouplingeffectofthebendingandtorsionwasnotandthegeo—Inetricshapesofthemaingirderofthebridge