大跨公铁两用钢桁拱桥边跨施工关键技术  

Key Construction Techniques for Side Spans of Long-Span Rail-cum-Road Steel Truss Arch Bridge

作　　者：周仁忠[1,2] 康学云 唐震 刘华龙 ZHOU Renzhong;KANG Xueyun;TANG Zhen;LIU Hualong(CCCC Second Harbor Engineering Co.,Ltd.,Wuhan 430040,China;Key Laboratory of Large-Span Bridge Construction Technology,Wuhan 430040,China;CCCC SHEC Fourth Engineering Co.,Ltd.,Wuhu 241000,China)

机构地区：[1]中交第二航务工程局有限公司,湖北武汉430040 [2]长大桥梁建设施工技术行业重点实验室,湖北武汉430040 [3]中交二航局第四工程有限公司,安徽芜湖241000

出　　处：《世界桥梁》2024年第5期30-36,共7页World Bridges

摘　　要：常泰长江大桥天星洲专用航道桥为(168+388+168)m大跨重载公铁两用钢桁拱桥。主梁采用2片主桁双层板桁组合结构,边跨钢梁施工采用架梁吊机悬臂散件拼装。为确保边跨钢梁架设轴线和竖曲线线形,按照最快形成稳定桁片结构原则拼装,上墩前悬臂拼装并形成三角桁片稳定结构后再实施抄垫;在钢梁架设过程中对钢梁标高进行调整,精确控制钢梁上墩标高;为确保边跨钢梁架设结构受力满足要求,通过有限元理论分析比选,确定临时墩最优脱空时机;采用“基于空间六点调位法”对边跨钢梁进行整体精确定位;主墩支座采用重力法灌浆;基于多点变形协调,通过优化杆件安装工艺,解决了超静定结构杆件带力安装难题。With a main span of 388 m and two side spans of 168 m,the Tianxingzhou Special Ship Channel Bridge is a long-span steel truss arch bridge accommodating heavy road and rail loads.The deck system consists of two main trusses that act compositely with the upper and lower orthotropic steel panels.The steel girders in the side spans were cantilever-assembled with individual members using deck cranes.To ensure the axial and vertical alignments of the steel girders in side spans,the principle of"forming a stable truss structure as fast as possible"was followed,before landing on the top of piers,the individual members of the trusses were assembled to be stable triangular structures first,and then cushioned to keep close contact with the pier top.During the erection,the elevations of the steel girders were dependently adjusted to accurately control the elevations of the steel girders when landing on pier tops.To ensure that the mechanical property of the steel girders in side spans could meet the requirements,numerical simulation was carried out to determine the optimal removal time of the auxiliary piers.The superstructure in the side spans was accurately positioned using a"spatial six-point positioning method",and the bearings rest on the main piers were gravity-grouted.Based on the multi-point deformation coordination,the truss members assembly process was modified to achieve the installation of members with forces in the statically indeterminate structure.

关 键 词：钢桁拱桥 悬臂散件拼装 上墩标高 临时墩脱空 钢梁调位 支座灌浆 杆件带力安装 施工技术 

分 类 号：U488.22[交通运输工程—载运工具运用工程] U445.46[交通运输工程—道路与铁道工程]