钢管桩在垂直开挖深基坑支护中的应用

Application of Steel Pipe Pile in Vertical Excavation and Supporting of Deep Foundation Pit

在城区深基坑开挖支护时,其周边往往会遇到密集的建(构)筑物或各种管线设施,这就要求开挖支护过程中应确保支护结构变形控制在很小的容许范围内,以保证周边建(构)筑物及管线设施的安全;且在这种支护空间往往比较狭小,几无放坡空间而需要垂直开挖的基坑中,采用需要大型施工设备的支护桩、地下连续墙等工法往往也是不适宜的。鉴于此,采用直径较小的钢管桩结合预应力锚杆的支护形式对某工程进行了设计施工探讨,经工后监测效果良好,从而验证了这一支护形式的可行性,可供其它类似工程参考。

There are usually dense buildings and all kinds of pipelines around the deep foundation pits during their excavation and supporting in the urban area. Thus the deformation of the supporting structures in the course of excavation must be ensured to be in little allowable range so that those buildings and pipelines would be safe.And it is usually not feasible that using the retaining piles or underground diaphragm wall to retain and protect the excavations.It is because that there is no space can be used for large construction equipment and make slope so that the digging must be done vertically.Thus the design and construction of a deep excavation are made by using composite style of the small steel pipe pile and prestressed anchor.After monitoring testing the results are good, so it verifies the supporting type is feasible,and it can be as reference for similar engineering project.