高水位软土地区顶进式铁路框架桥设计

Design for Jacking-type Railway Frame Bridge in High Water Level and Soft Soil Area

公路跨穿铁路时由于道路红线宽度、线位、横纵坡、周边环境等制约因素,常使用顶进框架桥的形式通过铁路。顶进式框架桥的优点是对周边环境和铁路影响小同时在施工时不会中断铁路运营。结合天津某工程实例,阐述顶进式框架桥在软土地区路基填土稳定性差、地下水位高并对结构有腐蚀性、地基承载力差等特殊条件下设计所采取的技术措施,为类似的工程提供借鉴。

Due to the restricting factors of road red line width,line,transverse and longitudinal slopes and the surrounding environment,the form of jacking-type frame bridge is commonly used when the road crosses the railway.The advantage of this frame bridge is its little impact on the surrounding environment and railway,as well as no interference with the opera-tion of the railway.The essay,combined with a project in Tianjin,expounds the technical measures of designing the jack-ing frame bridge under the special conditions of poor stability of roadbed filling in soft soil area,high underground water level and the corrosiveness to the structure,as well as poor bearing capability of the roadbed,to provide the reference for the similar engineering.