嘉闵高架路(春申铁路段)北竹港过水框架扩孔工程设计与施工技术

Design and Construction Technology of Water Frame Expanding Project of Beizhu Harbor in Jiamin Elevated Road(Chunshen Railway Section)

近年来下穿既有线铁路框架桥顶进施工有较多的实践,但在正线下进行现浇施工为数不多,由于上海地区地质条件差,现浇框架施工便梁在线周期长,安全风险高,动车组运行要求高,因此施工方案的选择和优化就显得尤为重要。该文以北竹港下穿既有沪春铁路框架桥扩孔工程设计与施工为例,总结既有线下现浇框架桥若干体会,为在正线上同类施工提供参考。

In recent years,there are more practices of the frame bridge jacking construction to underpass the existing railways,but there is few in number cast-in-situ construction under the main railway.Owing to the poor geological condition of Shanghai,the on-line period of cast-in-situ frame construction for the beam is long with the high safety risk,but the operation of motor train unit is highly required.Therefore,the selection and the optimization of construction scheme are more important.Taking the design and construction of the frame bridge expanding project to underpass the existing Huchun Raiwlay in Beizhu Harbor as an example,the article sums up some experience of the cast-in-situ frame bridge under the existing railway,which can be referred for the similar construction on the railways.