This paper carries out technological and economic comparison on the reconstruction and expansion design scheme of seismic damage bridge on the existing railway line,and recommends reliable technology and economic scheme for reconstruction and expansion design.The successful implementation of the bridge reconstruction and expansion design on existing railway line has certain guiding significance for the reconstruction and expansion design and construction of damage bridge on existing railway line.%对既有铁路线某震害桥梁的改扩建设计方案进行了技术经济比较,在此基础上推荐了技术可靠、经济合理的方案进行改扩建设计;本次既有线桥梁改扩建设计与施工成功实施,对其他既有铁路线病害桥梁的改扩建设计与施工具有指导意义。
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