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1、橋梁建設(shè)２０１７年第４７卷第６期（總第２４７期）BridgeConstruction，Vol．４７，No．６，２０１７（TotallyNo．２４７）１文章編號：１００３－４７２２（２０１７）０６－０００１－０６平潭海峽公鐵兩用大橋通航孔橋橋塔墩承臺施工技術(shù)張立超（中鐵大橋局集團有限公司，湖北武漢４３００５０）摘要：平潭海峽公鐵兩用大橋FPZQ-３標段的３座通航孔橋均為雙塔鋼桁混合梁斜拉橋，橋塔墩均采用圓端啞鈴形高樁承臺，承臺施工采用集主體防撞結(jié)構(gòu)與施工圍堰一體的防撞箱圍堰結(jié)構(gòu)（由雙壁吊箱圍堰、防撞梁及聯(lián)結(jié)系組成），
2、將永久結(jié)構(gòu)與施工結(jié)構(gòu)有效結(jié)合。防撞箱圍堰采用工廠整體制造、整體吊裝工藝施工，以實現(xiàn)圍堰高精度制造與吊裝；圍堰下沉采用多臺連續(xù)千斤頂液壓數(shù)控整體下放技術(shù)，并采用數(shù)控液壓多點同步下放系統(tǒng)及多層水平限位裝置，以克服波流力大、潮位變化大等不利影響，實現(xiàn)圍堰自動化下放施工；圍堰采用分區(qū)封底、系梁區(qū)無封底工藝施工，承臺混凝土分兩層、三次施工，以解決圍堰抗浮、抗沉難題。該橋通航孔橋６個橋塔墩承臺均已施工完成，結(jié)果均滿足要求。關(guān)鍵詞：跨海大橋；公路鐵路兩用橋；斜拉橋；承臺；防撞箱圍堰；施工技術(shù)；橋梁施工中圖分類號：U４４８．２７；
3、U４４３．２５文獻標志碼：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
