论述石大快速路沪杭公铁立交桥改造

Improvement of Shanghai-Hangzhou Highway and Railway Overpass of Shida Expressway

沪杭公铁立交桥是石大快速路跨越沪杭铁路的重要节点，由于快速路高架桥宽度与原立交桥桥面宽度不一致，并且缺少桥面拼宽空间；在改造过程中，提出了在原桥宽度不变的基础上，采取利用中央分隔带空间的改造思路，通退封上、下部结构进行改造设计和验算，得出最佳改造方案；并封改造设计中的节点设计和植筋施工技术进行阐述。

Shanghai-Hangzhou highway and railway overpass is a very important node for Shida Expressway across the Shanghai-Hangzhou Railway. The width of overpass is not consistency with the width of the Viaduct, and lack of deck space. In the improvement process, we can keep the width of the original bridge, take advantage of the median space, calculating and designing the upper and lower parts of the structure, then we proposed the best improving programs; At the same time, 1 described how to design the nodes in the improvement process and construction techniques of embedded steel bars.