武汉天兴洲公铁两用长江大桥总体设计

武汉天兴洲长江大桥位于微弯分汊型河段,为公路6车道铁路4线的公铁两用桥,根据通航要求,南汊为主航道,采用跨度504 m的钢桁梁斜拉桥结构,北汊需布置跨度80 m的桥梁结构。从减少拆迁量和用地、合理利用桥位资源的角度考虑,大桥选择采用铁路公路两用桥方式。经济分析表明,南汊大跨桥梁合建、北汊中小跨度桥梁分建为经济合理的方案。

Overall Design of Wuhan Tianxingzhou Changjiang River Rail-cum-Road Bridge

Located over the slightly bent Y-shape branch sector of the Changjiang River,Wuhan Tianxingzhou Changjiang River Bridge is a railcum-road bridge that will carry dual three lane roadways and dual double track railways.In accordance with the requirement for navigation,the southern branch of the river will be the main navigable channel where a cable-stayed steel truss girder bridge with a main span 504 m is to be built while over the northern branch,the bridge consisting of 80-m span structure is required.In view of minimizing the residential relocation,right-of-way requisition and making a rational use of land resources at the Bridge site,a rail-cum-road bridge type is selected for the Bridge.The economic analysis indicates that it is the economic and rational scheme to build a long span combined railway and roadway bridge over the southern river branch and the medium and small span bridge over the northern river branch separately for the railways and roadways.