深江铁路洪奇沥公铁大桥主桥设计关键技术  

Key Design Technologies of Main Bridge of Hongqili Rail-cum-road Bridge on Shenzhen-Jiangmen Railway

作　　者：刘振标[1] 夏正春[1] 印涛[1] 张晓江[1] 徐伟伟 杨得旺 LIU Zhenbiao;XIA Zhengchun;YIN Tao;ZHANG Xiaojiang;XU Weiwei;YANG Dewang(China Railway Siyuan Survey and Design Group Co.Ltd,Wuhan,Hubei 430063,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《铁道工程学报》2024年第2期55-60,共6页Journal of Railway Engineering Society

基　　金：国铁集团科技研发项目(N2021G034,N2023G040);中国铁建股份有限公司科技研发项目(2021-B17);中铁第四勘察设计院集团有限公司科技研发项目(2021K001,2021K006,2021K015)。

摘　　要：研究目的:洪奇沥公铁大桥是深江铁路的控制性工程,主桥采用主跨808 m公铁合建斜拉桥一跨跨越洪奇沥水道,上层布置8车道城市快速路,下层布置4线铁路。结合建设条件、结构特点及使用性能,对主桥结构体系、主梁横断面及结构形式、索-塔锚固结构、施工方法等关键技术展开研究,确定技术合理可行和经济节约的设计方案。研究结论:(1)首创了短边跨叠合板-桁组合梁斜拉桥结构体系,主桥长度减少20%,节省工程投资;(2)首次在4线铁路公铁合建斜拉桥上采用倒梯形双主桁截面,桥面布置紧凑、受力明确;(3)提出的边跨主梁采用矩形钢管混凝土叠合板-桁组合结构,集结构受力和锚固压重于一体,施工便捷;(4)发明了“自平衡交叉锚固+齿块锚固”的索-塔混合锚固方式,技术经济性高;(5)钢主梁创新采用“纵向大节段+横向分块”施工方法,解决了超宽超高超重整节段钢桁梁运输受既有桥净空限制的难题;(6)本研究成果可为公铁合建桁梁斜拉桥设计提供参考或借鉴。Research purposes:The Hongqili Rail-cum-road Bridge is control project of the new Shenzhen-Jiangmen Railway.The main bridge is a cable-stayed bridge with a main span of 808 m across the Hongqili Waterway.The upper layer is arranged with the 8-lane urban expressway,and the lower layer is arranged with 4-line railway.Combined with the construction conditions,structural characteristics and service performance,the key technologies such as structure system of the main bridge,the cross section and structural form of the main beam,the cable-tower anchorage structure and the construction method are studied to determine the reasonable and economical design scheme.Research conclusions:(1)The structural system of laminated slab-truss composite girder cable-stayed bridge with short side span is first proposed,which reduces the length of main bridge by 20%and saves engineering investment.(2)The inverted trapezoidal double main truss section is firstly adopted in the main girder of the 4-line rail-cum-road bridge,which makes the deck layout compact and the stress clear.(3)The proposed side span main girder adopts the rectangular concrete-filled steel tube laminated slab-truss composite structure,which integrates the stress and anchorage pressure of the structure,and is convenient for construction.(4)The cable-tower hybrid anchorage mode of"self-balanced cross anchorage+tooth block anchorage"is invented,which has high technical and economic efficiency.(5)The main girder creatively adopts the construction method of"longitudinal large section+transverse block",which solves the problem that the transportation of ultra-wide ultra-high overweight full block of steel girder is limited by the clearance of the existing bridge.(6)The research results of this paper can provide reference for the design of rail-cum-road cable-stayed bridge with truss girder.

关 键 词：公铁合建 短边跨斜拉桥 双主桁 叠合板-桁组合梁 自平衡交叉锚固 

分 类 号：U448.121[建筑科学—桥梁与隧道工程] U442.54[交通运输工程—道路与铁道工程]