资源描述：
《武汉二七长江大桥中主塔墩基础围堰施工技术》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、武汉二七长江大桥中主塔墩基础围堰施工技术高培成,佘巧宁1文章编号:1003-4722(2010)02-0001-04武汉二七长江大桥中主塔墩基础围堰施工技术高培成,佘巧宁(中铁大桥局武汉二七长江大桥Ⅱ、Ⅲ标项目部,湖北武汉430081)摘要:武汉二七长江大桥通航孔主桥为三塔双索面斜拉桥,中主塔墩位于长江中心航道上,其下部结构基础为18根<3.40m钻孔灌注桩。采用双壁钢吊箱围堰法进行基础施工。钢吊箱围堰在工厂制造,完成后整体滑移下水并浮运至墩位,采用重力锚锭系统进行围堰定位;围堰定位完成后,插打定位钢护筒,将围堰与已经插打完成的钢护筒进行连接形成稳定
2、的钻孔平台,插打剩余钢护筒,进行钻孔桩施工;钻孔桩施工完毕,将围堰下放至围堰封底设计标高,进行围堰清淤、堵漏,用垂直导管法依次浇注封底舱、底隔舱、侧舱封底水下混凝土,按照从两端向中间、从外向内的顺序分块、对称进行施工。关键词:武汉二七长江大桥;桥梁基础;双壁钢吊箱围堰;桥梁施工中图分类号:U448.27;U445.556文献标志码:AConstructionTechniquesofCofferdamforIntermediatePylonPierFoundationofWuhanErqiChangjiangRiverBridgeGAOPei2chen
3、g,SHEQiao2ning(SectionofContractsⅡandⅢofWuhanErqiChangjiangRiverBridgeConstructionProject,ChinaZhongtieMajorBridgeEngineeringGroupCo.,Ltd.,Wuhan430081,China)Abstract:ThenavigablespanmainbridgeofWuhanErqiChangjiangRiverBridgeisatriple2pylonanddouble2cable2planecable2stayedbridge
4、withitsintermediatepylonpierlocatedinthecentralshippingchanneloftheChangjiangRiver.Thefoundationofthepylonpierismadeupof18nos.of<3.40mboredpilesandwasconstructedbythedouble2wallsteelboxedcofferdam.Thecofferdamwasmanufacturedinshop,launchedtoriverintegrallyandfloatedtothepiersit
5、ewhereitwaspositionedbythegravityanchorsystem.Afterthecofferdamwaswellpositioned,partofthesteelcasingswereinsertedanddrivenin,thecasingswerethenconnectedwiththecofferdamtoformastableboringplatform.Therestofthecasingswerecontinuouslyinsertedanddriveninandtheboringconstructionwas
6、carriedout.Uponthecompletionoftheconstruc2tionoftheboredpiles,thecofferdamwassunkdowntothedesignelevationofthecofferdambasesealing,theinsideofthecofferdamwasclearedoff,thewaterleakagetherewasstoppedandthetremieconcretewascastbythetremieductsintothebasesealingbulks,bottompartiti
7、onbulksandsidebulksofthecofferdaminsuccessionandtheconcretewascastinsectionssymmetricallyfrombothendstothemiddleandfromtheoutsidetotheinside.Keywords:WuhanErqiChangjiangRiverBridge;bridgefoundation;double2walledsteelboxedcofferdam;bridgeconstruction收稿日期:2010-02-08作者简介:高培成(1962-
8、),男,高级工程师,1994年毕业于华中理工大学,工学学士(gpc@ztmbec.com)。2桥梁建设201
