京沪高速铁路跨吴淞江桥式方案研究

Research on Bridge Type Scheme of Beijing-Shanghai High-speed Railway Spanning the Wusong River

京沪高速铁路及上海虹桥站相关工程共10条线路并行跨越吴淞江,受上海虹桥站、虹桥动车运用所站场位置控制,各线路中心线与河道中心线的夹角仅31°。为满足桥下通航要求,在工程可行性研究及初步设计阶段,对桥跨型式进行了多方案研究;结合京沪高速铁路前期科研成果,推荐的(60+100+60)m斜连续梁方案与工点建设环境最为匹配,工程投资最省。斜连续梁结构简洁美观,对斜跨道路、航道的铁路桥梁具有较强的适用性和推广价值;研究提出的斜连续梁中支点构造措施、支座布置方式可为同类型桥梁设计提供借鉴。

Drawn from the Beijing-Shanghai High-speed Railway and from the projects in relation to Shanghai Hongqiao Railway Station respectively, there were a total of 10 railway tracks to be laid in parallel on the bridge spanning the Wusong River. However, controlled by the positions of Shanghai Hongqiao Railway Station and Hongqiao EMU Servicing Depot, the angle between the centerline of every track and the river centerline was only 31 degree. In order to meet the requirements of navigation under the bridge, multiple bridge type schemes were researched and compared during the feasibility study and preliminary design stages. Finally, based on early research results of Beijing-Shanghai High-Speed Railway, the scheme of （60＋100＋60）-m skew continuous girder bridge was recommended because it not only was most compatible with the environment but also was most economical. Skew continuous girder bridge has wide applicability and popularization value to the railway bridge which needs to obliquely span a road or a shipping lane. This paper also proposes some structural measures at the middle supporting point of skew continuous girder and the layout patterns of bridge bearings, which may serve as a reference to the designer of the same type bridge.