随着我国经济发展,许多既有干线铁路已不能满足当前经济发展的需求,需要对既有线进行扩能改造,致使既有上跨下穿结构物需拆除并还建,尤其为上跨既有线的主干桥梁,拆除前需要进行交通分流。本文就乐坪西改造施工过程交通分流及便桥施工工艺进行了详细阐速,为施工提供了理论依据和现实意义,并在实际工程应用中保证了安全,使施工得以顺利进行。 With the economic development in our country, many existing trunk railways are no longer able to meet the needs of current economic development. Therefore, it is necessary to expand the capacity of existing railways so that the existing cross-piercing structures need to be demolished and built. In particular, The backbone of the bridge, the need for traffic diversion before demolition. This paper elaborates the traffic diversion and construction process of the bridge in Lepingxi Reconstruction, provides a theoretical basis and practical significance for the construction, and ensures the safety in the actual engineering application so that the construction can be carried out smoothly.