平潭海峡公铁大桥施工关键技术  

Key Construction Techniques for Pingtan Straits Rail-cum-Road Bridge

作　　者：刘自明[1] LIU Zi-ming(China Railway Major Bridge Engineering Group Co., Ltd., Wuhan 430050, China)

机构地区：[1]中国中铁大桥局集团有限公司

出　　处：《桥梁建设》2019年第5期1-8,共8页Bridge Construction

摘　　要：平潭海峡公铁大桥的FPZQ-3标段全长约11.15km,包括3座通航孔桥(双塔钢桁混合梁斜拉桥)、34孔简支钢桁结合梁桥、119孔混凝土箱梁桥。针对风大、浪高、水深、流急、潮差大及地质条件复杂等工程特点,对施工期间的风浪进行监测及预报,以指导施工;基础采用“先平台后围堰”的方案施工,采取了长栈桥、钻孔平台及超大直径钻孔桩等施工技术,桥塔墩承台采用哑铃形防撞箱围堰施工;桥塔采用全封闭液压爬模施工,采取了全封闭防风液压爬模抗风、11000kN·m塔吊及塔吊附墙抗风、空间桁架横撑等施工技术;通航孔桥钢桁梁采用整节段全焊制造、拼装,利用架梁吊机或3600t浮吊整节段海上架设;混凝土箱梁采用海上造桥机和现浇支架施工;简支钢桁梁采用工厂整孔制造,船运至现场后利用3600t浮吊整孔吊装。The Contract FPZQ-3 of the Pingtan Straits Rail-cum-Road Bridge project consists of three navigational channel bridges (all two-pylon steel truss-concrete hybrid girder cable-stayed bridges), a 34-span simply-supported steel truss-concrete composite girder bridge and a 119-span concrete box girder bridge, with a total length of about 11.15 km. The construction of the bridge faces challenges imposed by heavy winds, high waves, deep seawater, raging torrents and large tidal ranges and complex geological conditions. The winds and waves are monitored and forecasted to direct the construction. For the foundation construction, the platform is erected before the launching of the cofferdam, and long trestles, pile hole drilling platforms and large-diameter bored piles are used. The pile caps of the pylon piers are constructed with the aid of the dumbbell-shaped anti-collision box cofferdams. The pylons are erected by the use of fully-closed hydraulic climbing formworks. Different wind-resistant measures are taken, such as choosing the fully-closed wind-resistant hydraulic climbing formworks, attaching walls to stabilize the tower crane that has a lifting capacity of 11 000 kN·m, and using spatial trusses as the lateral bracings. The steel truss girders in the navigational spans are assembled from integral fully-welded truss sections that are lifted and installed by girder erection cranes or the floating crane with a capacity of 3 600 t. The concrete box girders are cast by the use of offshore bridge building machine and scaffoldings. The simply-supported steel truss girders in a span are manufactured as an integral unit, and delivered to the construction site to be lifted and installed by the 3 600 t-capacity floating crane.

关 键 词：跨海峡大桥 公路铁路两用桥 斜拉桥 超大直径钻孔桩 吊箱围堰 钢桁梁 混凝土梁 施工技术 

分 类 号：U448.121[建筑科学—桥梁与隧道工程] U445.4[交通运输工程—道路与铁道工程]