平潭海峡公铁两用大桥通航孔桥桥塔墩承台施工技术.pdf

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1、桥梁建设２０１７年第４７卷第６期（总第２４７期）BridgeConstruction，Vol．４７，No．６，２０１７（TotallyNo．２４７）１文章编号：１００３－４７２２（２０１７）０６－０００１－０６平潭海峡公铁两用大桥通航孔桥桥塔墩承台施工技术张立超（中铁大桥局集团有限公司，湖北武汉４３００５０）摘要：平潭海峡公铁两用大桥FPZQ-３标段的３座通航孔桥均为双塔钢桁混合梁斜拉桥，桥塔墩均采用圆端哑铃形高桩承台，承台施工采用集主体防撞结构与施工围堰一体的防撞箱围堰结构（由双壁吊箱围堰、防撞梁及联结系组成），

2、将永久结构与施工结构有效结合。防撞箱围堰采用工厂整体制造、整体吊装工艺施工，以实现围堰高精度制造与吊装；围堰下沉采用多台连续千斤顶液压数控整体下放技术，并采用数控液压多点同步下放系统及多层水平限位装置，以克服波流力大、潮位变化大等不利影响，实现围堰自动化下放施工；围堰采用分区封底、系梁区无封底工艺施工，承台混凝土分两层、三次施工，以解决围堰抗浮、抗沉难题。该桥通航孔桥６个桥塔墩承台均已施工完成，结果均满足要求。关键词：跨海大桥；公路铁路两用桥；斜拉桥；承台；防撞箱围堰；施工技术；桥梁施工中图分类号：U４４８．２７；

3、U４４３．２５文献标志码：AConstructionTechniquesforPileCapsofPylonPiersofNavigableSpanBridgesofPingtanStraitsRail-cum-RoadBridgeZHANGLichao-（ChinaRailwayMajorBridgeEngineeringGroupCo．，Ltd．，Wuhan４３００５０，China）Abstract：The３navigablespanbridgesofContractFPZQ-３ofthePingtanStra

4、itsRail-cum-RoadBridgeareallthedouble-pylonsteeltrusshybridgirdercable-stayedbridges．Thepilecapsofthepylonpiersofthebridgesweredesignedintotheelevatedpilecapsofround-endeddumbbellshapeandwereconstructed，usingtheanti-collisionboxcofferdamstructures（composedofth

5、edouble-wallboxedcofferdams，anti-collisionbeamsandbracingsystems）integratingthemainanti-collisionstructuresandtheconstructioncofferdamsandasaconsequence，thepermanentstruc-turesofthebridgewereeventuallyeffectivelycombinedwiththeconstructionstructures．Theanti-co

6、llisionboxcofferdamsweremanufacturedintegrallyintheworkshopandliftedandinstalledinte-grallyinthefieldinordertorealizethehighlyaccuratemanufacturingandinstallationofthecof-ferdams．Themultiplesetsofthecontinuousjacksandthenumericalcontrolhydraulictechniquewereus

7、edtointegrallylowerthecofferdamsdowntotheriverandthemulti-pointandsynchro-nizedloweringsystemofthenumericalcontrolhydraulicandthemulti-levelhorizontallimitdeviceswereusedaswelltogetovertheadverseinfluencesofthegreatwavecurrentforcesandtidechan-gesandtorealizet

8、heautomaticloweringofthecofferdams．Afterthecofferdamsweresunkdowninplace，thebasesofthecofferdamsweresealedinareasandintheareasofthetiebeams，theconstructionofthebasesealingwasnotnee