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在软土地基营业线上建造有通航要求的较大跨度的桥梁时,采用顶入钢筋混凝土箱形框架桥是一种较好的结构形式。目前,在建造较大跨度或数跨连续框架桥顶进施工时,由于不间断的运营条件及施工空间受限界要求的限制,无法采用简易的高大结构加固线路,施工单位往往用吊轨梁、横梁、纵梁等多层次结构的“纵挑横抬法”,但这种临时结构,由于层次较多,结构的整体性较差,在列车冲击作用下,即使限速25km/h慢行通过,线路的中线和水平仍较难保持,工地上往往需要大量人工对线路进行昼夜监督和保养,但仍然威胁着行车安全,成为施工中的薄弱环节。
In the soft-based business line construction of the navigation requirements of the larger span of the bridge, the use of roofing into the reinforced concrete box-framed bridge is a better form of structure. At present, when constructing a large-span or several-span continuous frame bridge jacking construction, due to the unrestricted operating conditions and the limited construction space requirements, the simple high-strength structural reinforcement lines can not be adopted. The construction units often use the hanger rails, Horizontal and vertical beams and other multi-level structure of the “vertical pick and roll lift method”, but this temporary structure, due to more levels, the overall structure of the poor, under the impact of the train impact, even if the speed limit of 25km / h slow through , The midline and level of the line are still harder to maintain. The construction site often requires a lot of manual supervision and maintenance of the line day and night, but it still threatens the driving safety and becomes the weak link in construction.