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随着城市工业发展和人民生活水平的提高,城市的上、下水道事业必然相继要扩建,大口径管线的施工任务日渐增加。由于城市建筑密度的增长和道路交通的繁忙,管线施工日益要求采用不开槽施工法。但是大口径管子(钢筋混凝土管)的自重很大,在土壤中顶进时,所需的顶力较大,而管体强度为一定值,故当顶力达到某一界限后,必然要导致管体的破坏,或是后背墙承载力不足以致破坏等事故。因此,大口径管子的顶进长度受到限制,一般一次顶进距离约40米左右,如果需要穿越大型建筑群,或需穿越宽阔的
With the development of urban industries and the improvement of people’s living standards, the urban sewer and sewer operations will inevitably have to be expanded one after another. Construction tasks for large-diameter pipelines are increasing. Due to the increasing density of urban buildings and the heavy traffic of roads, pipeline construction increasingly requires the use of a non-grooving method. However, the large-diameter pipe (reinforced concrete pipe) has a large self-heavy weight. When jacking in the soil, the required jacking force is large, and the pipe body strength is a certain value. Therefore, when the jacking force reaches a certain limit, it will inevitably lead to The destruction of the pipe body or the bearing capacity of the back wall is not enough to destroy it. Therefore, the jacking length of large-diameter pipes is limited. Generally, the jacking distance is about 40 meters at a time. If you need to cross large buildings, you may need to cross a wide area.