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1、18桥梁建设2010年增刊1文章编号:1003-4722(2010)S1-0018-04嘉绍跨江大桥桥塔墩承台钢围堰结构设计与施工1112洪苏科,张敏,张牧,刘德清(1.嘉绍跨江大桥工程建设指挥部,浙江绍兴312366;2.武汉桥梁建筑工程监理有限公司,湖北武汉430034)摘要:嘉绍跨江大桥主桥为单桩独柱六塔四索面斜拉桥,桥塔墩承台为圆形深埋式,采用无底双壁钢围堰整体下放施工。钢围堰由侧板系统、导向内撑系统和下放就位系统组成。从拼装平台搭设、钢围堰侧壁拼装、导向及定位系统安装、下放系统布置、刃脚混凝土浇注及围堰下沉
2、施工方面总结了钢围堰施工技术,其中围堰下沉分为依靠自重下沉、注水下沉、舱壁混凝土浇注及吸泥下沉、最后一次舱壁混凝土浇注及吸泥下沉到位4个阶段。实践证明,该桥钢围堰施工是成功的,其纵向及平面偏差均满足规范要求。关键词:嘉绍跨江大桥;斜拉桥;承台;钢围堰;结构设计;桥梁施工中图分类号:U443.162文献标志码:AStructuralDesignandConstructionofSteelCofferdamsforPileCapsofPylonPiersofJiashaoBridge1112HONGSu-ke,ZHANG
3、Min,ZHANGMu,LIUDe-qing(1.ConstructionHeadquartersofJiashaoRiver-CrossingBridgeProject,Shaoxing312366,China;2.WuhanBridgeandBuildingWorksSupervisionCo.,Ltd.,Wuhan430034,China)Abstract:ThemainbridgeoftheJiashaoBridgeisacable-stayedbridgehavingthesinglepilesinglec
4、olumnpiers,sixpylonsandfourcableplanes.Thepilecapofpylonpierofthebridgeisacircularshapeanddeeplyburiedstructurethatisconstructedbywayofintegrallyloweringacof-ferdamwithoutbottom.Thecofferdamismadeupofthelateralwallsystem,guidingsystem,in-ternalbracingsystemandl
5、oweringsystem.Thetechniquesforconstructionofthecofferdamaresummarizedherewithfromaspectsofsetting-upoftheassemblingplatform,assemblingofthelateralwalls,installationoftheguidingsystemandpositioningsystem,arrangementofthelow-eringsystem,castingofconcreteintothecu
6、ttingedgesandsinkingofthecofferdam.Thecoffer-damissunkdowninfourstagesofsinkingbytheselfweightofthecofferdam,sinkingbywaterpumpedintothecofferdam,castingofconcreteintothebulksofthecofferdam,sinkingbymudair-liftingandthefinaltimecastingofconcreteintothebulksands
7、inkingbyair-lifting.Practiceprovesthattheconstructionofthecofferdamsofthebridgeisquitesuccessful,theverticalandplanpositiondeviationsofthecofferdamscanallsatisfytherelevantrequirementsinthetechnicalspecification.Keywords:JiashaoBridge;cable-stayedbridge;pilecap
8、;steelcofferdam;structuraldesign;bridgeconstruction收稿日期:2010-11-18作者简介:洪苏科(1972-),男,高级工程师,1995年毕业于扬州大学水利工程建筑专业,工学学士(781638279@qq.com)。嘉绍跨江大桥桥塔墩承台钢围堰结构设计与施工洪苏科,张敏,张牧,刘德清191工程
