随着既有线改造任务的加重,在既有线修建立交工程,如在车站增设地道,在区间将平交道改为立交桥涵、穿越路基修建护管涵等,这些工程日益增多。为减少施工对行车的干扰,桥涵顶入法和顶拉法已日益作为主要的施工方法被采用。 当顶入法和顶拉法施工遇到软土时,施工将是十分困难的。由于软土的一些特性,使桥涵建筑物在顶进过程中极易发生顶进低头和路 With the aggravation of the task of reconstructing the existing lines, there are more and more projects such as the construction of interchange works on existing lines, such as the addition of tunnels at the stations, the replacement of level intersections to overpass bridges and culverts, and the construction of culverts along the roadbed. In order to reduce the construction on the traffic jamming, bridge culvert jacking method and the top pull method has increasingly been used as the main construction method. When top-in construction and roof-top construction encounter soft soil, the construction will be very difficult. Due to some characteristics of soft soil, so that the bridge culverts in the process of jacking can easily lead into the bow and road