安庆长江铁路大桥主墩大型深水基础施工方案与关键技术

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1、桥梁建设2012年第42卷第6期(总第217期)BridgeConstruction，Vo1．42，No．6，2012(TotallyNo．217)文章编号：1003—4722(2012)06—0001—07安庆长江铁路大桥主墩大型深水基础施工方案与关键技术农代培，季跃华。，徐炳法(1．中铁大桥局安庆长江铁路大桥指挥部，安徽安庆246008；2．中铁大桥局集团有限公司，湖北武汉430050)摘要：宁安铁路安庆长江铁路大桥主桥为双塔多跨连续钢桁梁斜拉桥，该桥3号、4号墩均采用高桩承台基础。为解决桩基汛期施工

2、风险大和3号墩深水无覆盖层斜岩面环境下桩基施工平台搭建难题，经方案比选，3号、4号墩基础采用先围堰(直径56m)后平台的双壁钢围堰施工方案。施工中采取了以下关键技术：3号墩围堰采用气囊法下河，4号墩围堰采用整体起吊下河；围堰采用无导向船重锚锚碇系统定位；采用活动插板法快速完成了斜岩面围堰底缺口封堵；围堰采取了分区封底施工。关键词：斜拉桥；基础；方案比选；钢围堰；桥梁施工中图分类号：U448．27；U445．55文献标志码：AC0nstructi0nSchemeandKeyConstructionTechn

3、iquesforLargeDeepwaterFoundationsofMainPiersofAnqingChang]iangRiverRailwayBridgeNONGDai—pei，J1Yue-hua，XUBing—fa(1．ConstructionHeadquartersofAnqingChangjiangRiverRailwayBridge．ChinaRailwayMajorBridgeEngineeringGroupCo．，Ltd．，Anqing246008，China；2．ChinaRailwa

4、yMajorBridgeEngineeringGroupCo．，Ltd．，Wuhan430050，China)Abstract：ThemainbridgeofAnqingChangjiangRiverRailwayBridgeonNanjing—AnqingRailwayisadouble——pylonandmulti——spancontinuoussteeltrussgirdercable-stayedbridgeandthemainpiersNo．3andNo．4ofthebridgearesuppo

5、rtedontheelevatedpilecapfoundations．Tocopewiththeproblemsthattheconstructionriskofthepilefoundationswouldbehighinthefloodperiodandthesetting—upoftheworkingplatformwouldbedifficultforthefoundationofthePierNo．3ontheinclinedrocksurfaceindeepwaterandwithoutov

6、erburden，itwasdeter—minedthroughcomparisonthattheconstructionschemeofbuildingthecirculardouble-wallsteelboxedcofferdams(eachbeing56mindiameter)forthePiersNo．3andNo．4firstandsettinguptheplatformslatewouldbeadopted．Intheprocessoftheconstruction，thefollowing

7、keytech—niqueswereapplied，i．e．thecofferdamforthePierNo．3waslaunchedtotheriverbytheairbagmethodandthecofferdamforthePierNo．4wasintegrallylifteddowntotheriver．Boththecof—ferdamswerepositionedatthepiersitesbytheheavyanchoranchoragesystemswithoututilizingtheg

8、uidingbarges．Theopeningatthebottomofthecofferdamontheinclinedrocksurfacewasfastblockadedbythemovableinsertedsteelplatemethodandthebasesofthetwocofferdamsweresealedbytremieconcreteinareas．Keywords：cable—stayedbridge；