框架桥顶进施工时既有铁路架空加固技术

Strengthening Techniques for the Elevated Existing Railway During the Construction of the Framed Bridge

结合郑州东绕城公路下穿京广铁路框架桥顶进施工,介绍在不中断既有铁路运营行车的条件下,采用吊轨、纵梁、横梁相结合加固架空既有铁路、顶进框架桥的施工技术。该方案的采用成功解决了框架桥顶进时既有线路架空跨度大的施工难题。

With the forward-driving construction of the framed bridge underlying the existing railway of the Zhengzhou Round-city Highway as a practical example, the construction techniques for lifting tracks, and the combination of longitudinal beams and transverse beams to strengthen the existing railway for the for-ward-driving construction of large-spanned bridges under the elevated existing railway without interrupting the normal operation of the railway are presented in the paper. The construction techniques help success-fully solve the construction problem of the elevating-spanning distance of the existing railway track being great when a framed bridge is being forward-driven under it.