城市道路下穿铁路设计方案的比选

The Comparative Choice of the Design Schemes for Urban Roads Under-Crossing Railways

某拟建城市道路下穿铁路立交桥工程,以19°的交角与铁路交叉。提出三种道路下穿铁路方案:修建铁路临时便线、新建现浇框架桥;新建顶进框架桥;修建铁路临时便线,新建2×64m钢桁桥。从技术特点、实施难易、施工风险、投资等方面对城市道路下穿铁路立交桥实施方案进行对比分析,最终决定采用方案一。目前该项目的铁路临时便线工程已实施,铁路临时便线运营状态较好。可为同类工程设计提供设计参考。

A certain planned urban highway has to under-cross an existing railway flyover, in a skew angle of 19 degrees with the railway,in which case three under-crossing schemes are put forward： building a temporary make-shift railway, building a cast-in-place frame bridge or building a jacking-type frame bridge. If the temporary make-shift railway is to be built,a 2 ×64m steel truss bridge has to be erected. All the three implementation schemes for the urban highway under-crossing the railway flyover are compared and analyzed respectively from the angles of the technical characteristics, the difficulty in implementation, the construction risk and the investment,with Scheme One finally chosen for the project. Right now, the project of the temporary make-shift railway is already implemented, with the operation state of the temporary make-shift railway found quite satisfactory. The success in the design of this project may serve as a useful reference for the design of other projects of the same type.