富阳鹿山大桥主墩深水承台施工技术

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1、富阳鹿山大桥主墩深水承台施工技术周功建77文章编号：1003—4722(2010)04—0077—04富阳鹿山大桥主墩深水承台施工技术周功建(中铁大桥局集团第一工程有限公司，河南郑州450053)摘要：富阳鹿山大桥主桥为(118+256+118)m双塔单索面预应力混凝土斜拉桥，桥塔墩承台为圆形，直径22m，高5．5m，承台底面在设计水位以下达15m，采用圆形双壁钢套箱围堰施工方案。该围堰不设内支撑，兼有挡水和模板功能。围堰在工厂内竖向分节、环向分块制作，车运至墩位处拼装，用千斤顶整体下放首节围堰自浮于水中，再对称安装剩余单元；利用定位桩精确定位，长

2、臂挖机配合吸泥机均匀下沉围堰至设计标高。封底混凝土不设置隔仓，采用垂直导管法一次性灌注。针对大体积承台，从配合比优化、混凝土输送方式、浇筑顺序、温度监控及养护等方面采取控制措施保证了承台大体积混凝土施工质量。关键词：斜拉桥；承台；围堰；大体积混凝土；桥梁施工中图分类号：U448．27；U443．25文献标志码：AConstructionTechniquesforDeepwaterPileCapsofPylonPiersofLushanBridgeinFuyangZHOUGong-jian(The1stEngineeringCo．，Ltd．，Chin

3、aRailwayMajorBridgeEngineeringGroup，Zhengzhou450053，China)Abstract：ThemainbridgeoftheLushanBridgeinFuyangisadouble—pylonandsingle—cable—planeprestressedconcretecable—stayedbridgewithspanarrangement(118+256+118)m．Thepilecapsforthepylonpiersofthebridgearecircularinshape，22mindia

4、meter，5．5mindepth，15munderthedesignedwaterlevelfromthebottomofthecapsandwereconstructedbythecir—culardouble—wallsteelboxedcofferdams．Insideeachcofferdam，theinternalbracingswerenotprovidedandthecofferdamconcurrentlyservedasthewaterretainingstructureandformwork．Thecofferdamwasma

5、nufacturedverticallyintiersandcircularlyinsegmentsinshop，deliveredbytruckstOthepiersitewheretheywereassembledtogether．Thefirsttiercofferdamwasfirstlyintegrallyloweredtotheriverbyjacks，floatedintheriverandthenthesuccessivetiersofthecofferdamweresymmetricallyinstalled．Thecofferd

6、amwasaccuratelypositionedbythepositio—ningpilesandwasevenlysunktoitsdesignedelevationbydredgingbytheaidofthelongboomexcavator．Fortheconstructionofthebasesealingtremieconcreteofthecofferdam，theconcretewascastonetimebytremieducts，nottobedoneinpartitionbulkbypartitionbulk．Inregar

7、dofthemassiveconcreteforthepilecaps，therelevantcontrolmeasuresoftheconcretemixpropor—tioningoptimization，conveyingways，castingsequence，temperaturemonitoringandcontrolandcuringweretakenandtheconstructionqualityoftheconcretewashenceensured．Keywords：cable—stayedbridge；pilecap；cof

8、ferdam；massiveconcrete；bridgeconstruction收稿Et期：2010—05一O7作者简介