随着我国技术经济的不断发展，在既有铁路线一侧，将预制好的框构桥顶进路基而增建公路铁路分离式立交桥，已得到广泛的应用，受到建设、施工和使用单位的普遍欢迎。但在软土地基上顶进框构桥，有时会产生很大偏差甚至危及既有线行车安全，这就需要在顶进施工中采取一些特殊方? With the continuous development of our country’s economy and technology, it has been widely applied that the prefabricated framed bridge is advanced into the embankment on the side of the existing railway line, and has been widely used by construction, construction and user units Generally welcome However, if the subgrade frame bridge is built on soft soil foundation, it may sometimes cause great deviation or even endanger the traffic safety of the existing line. Therefore, some special measures should be taken during the construction of jacking ground.