西堠门公铁两用大桥主桥结构设计  

Design of Main Bridge of Xihoumen Rail-cum-Road Bridge

作　　者：肖海珠[1] 高宗余[1] 刘俊锋[1] XIAO Hai-zhu;GAO Zong-yu;LIU Jun-feng(China Railway Major Bridge Reconnaissance&Design Institute Co.,Ltd.,Wuhan 430056,China)

机构地区：[1]中铁大桥勘测设计院集团有限公司,湖北武汉430056

出　　处：《桥梁建设》2020年第S02期1-8,共8页Bridge Construction

基　　金：中国中铁股份有限公司科技研究开发计划项目(2019-专项-01)。

摘　　要：西堠门公铁两用大桥主桥为主跨1 488m斜拉-悬索协作体系桥,公铁平层布置。主缆垂跨比为1/6.5,斜拉索与吊杆交叉索共9对,纯悬吊段长452m。主梁采用流线型三箱分离结构,中间箱通行铁路,边箱通行公路,主梁全宽68m(含风嘴),中心线处梁高5m。桥塔为A形钢筋混凝土结构,高294m。斜拉索采用Φ7mm高强平行钢丝束,呈扇形布置。主缆空间布置,塔顶处横向中心间距6m,跨中处横向中心间距26.5m,标准抗拉强度2 000MPa。4号桥塔墩采用设置钢沉井基础,5号桥塔墩采用18根Φ6.3m大直径钻孔桩基础。金塘岛侧锚碇采用岩锚,册子岛侧锚碇采用嵌岩重力锚。理论分析和试验研究表明大桥具有良好的静、动力性能,能够满足高速铁路行车要求。The main bridge of Xihoumen Rail-cum-Road Bridge is a combined cable-stayed suspension bridge with a main span of 1 488 m,which accommodates highway and railway on the same deck.The bridge features its 1/6.5 sag ratio,nine pairs of crossed stay cables and suspenders,and the pure 452 m-long suspended section.The main girder,which transversely consists of three separated streamlined boxes,totals 68 min width(including wind fairings)and measures 5 mdeep at the central line,with central box accommodating railway and side boxes carrying highway.The towers are A-shaped reinforced concrete structures,rising 294 m.The stay cables are made of Φ7 mm high-strength parallel steel wires and arranged in fan planes.The two main cables with nominal tensile strength of 2 000 MPa are in spatial arrangement,6 mapart at tower tops and 26.5 mapart in the midspan.The pylon pier No.4 is supported by the steel caisson foundation and the pylon pier No.5 is supported by the foundation formed of Φ6.3 mlarge-diameter bored piles.The main cables are anchored to a rock-socketed anchorage on the Jintang Island and a gravity anchorage on the Cezi Island.Theoretical analysis and test results reveal that static and dynamic performance of the bridge is sound,which can meet the load bearing requirements of high-speed railway.

关 键 词：公路铁路两用桥 斜拉-悬索协作体系桥 空间缆索 流线型三分箱 A形塔 设置钢沉井 大直径钻孔桩 风洞试验 

分 类 号：U448.121[建筑科学—桥梁与隧道工程] U442.5[交通运输工程—道路与铁道工程]