高店枢纽互通新建高速主线下穿G40沪陕高速既有线,既有线需进行路改桥,在路改桥施工期间要确保既有线单幅安全通行,为了确保单幅通行安全,路改桥采取后开挖式墩柱施工方案,即墩柱施工期间保留原路基不开挖,待本幅梁板架设完毕并施工完路面后再开挖土体,本文讨论了方案的可行性。 High-storey hub interconnection The new high-speed main line under the G40 Shanghai-Shaanxi Expressway existing line, existing line need to be changed road bridge, during the construction of the road to change the bridge to ensure that the single line of safe passage, in order to ensure single traffic safety, After excavation pier construction program, that is, during the construction of the pier retaining the original roadbed is not excavation, until the frame beams erection completed and finish the road surface after excavation of soil, this paper discusses the feasibility of the program.