安庆长江铁路大桥桥塔墩钻孔桩施工关键技术

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1、桥梁建设2013年第43卷第5期(总第222期)12BridgeConstruction，Vo1．43，No．5，2013(TotallyNo．222)文章编号：1003～4722(2013)05-0012—06安庆长江铁路大桥桥塔墩钻孔桩施工关键技术刘爱林(中铁大桥局宁安铁路安庆长江大桥工程指挥部，安徽安庆246008)摘要：安庆长江铁路大桥主桥为(101．5+188．5+580+217．5+159．5+1l6)m双塔三索面钢桁梁斜拉桥，3号、4号桥塔墩均采用37根3．4(3．0)m变直径钻孔摩擦桩基础，桩长分别达108m、110m。3

2、号、4号桥塔墩基础均采用双壁钢围堰施工方案，通过人工创建稳定地层施工环境，利用KTY4000型钻机完成清水法钻孔，钻孔到位后利用钻机进行第1次清孔，采用JJC一1D超声波成孔检测仪定量检孔，检测合格后移开钻机，下放钢筋笼和导管，利用导管进行第2次清孔，再灌注桩身水下混凝土，完成桩基施工。该桥桥塔墩桩基施工过程中未发生任何掉钻及断桩事故，经超声波无损检测均为I类桩。关键词：铁路桥；斜拉桥；桩基础；钻孔摩擦桩；桥梁施工中图分类号：U448．27；U445．551文献标志码：AKeyTechniquesforConstructionofPylo

3、nPierBoredPilesofAnqingChangjiangRiverRailwayBridgeLJ【，Af—lin(ConstructionHeadquartersofAnqingChangjiangRiverBridgeonNanjing-AnqingRailway，ChinaRailwayMajorBridgeEngineeringGroupCo．，Ltd．，Anqing246008，China)Abstract：ThemainbridgeofAnqingChangjiangRiverRailwayBridgeisasteel

4、trussgirdercable—stayedbridgewithdoublepylons。triplecableplanesandwithspanarrangement(101．5+188．5+580+217．5+159．5+116)m．ThepylonpiersNo．3andNo．4ofthebridgeareallsup—portedonthefoundationsthatarerespectivelymadeupof37nos．ofthej＆3．4(3．0)mvariabledi—ameterfrictionalboredpile

5、swiththelengthofthepilesbeingupto108mandI10m．Thefoun—dationsforthepylonpierswereconstructedbythedouble—wallsteelcofferdamscheme．Bywayoftheartificialeffort。theconstructionenvironmentofthestablestratumwascreated，theboredholesoftheclearwatermethodwerecompleted，usingtheKTY400

6、0boringmachine．Aftertheholeswereboredtothedesignedelevation，theholeswereclearedoffforthefirsttimebytheboringmachineandtheholeswerethenquantitativelyinspected，usingtheJJC一1DBoredHoleUltrasonicInspectionInstrument．Furtheraftertheholeswereprovedtobequalifiedthroughtheinspect

7、ion，theboringmachinewasremovedaway，thereinforcementcagesandtremieductswere10weredintotheholesandtheholeswereclearedoffforthesecondtimethroughtheducts．Final—lYthetremieconcreteforthepileswascasttocompletetheconstructionofthepilefoundations．Intheconstructionofthepiles，noacc

8、identslikethefallingoftheboringbitsandbreakingofthepilestookplaceandthepileswereallqualifiedasCl