严寒地区超长深基坑支护的设计施工一体化

Integrated Design and Construction of Super-Long and Deep Foundation Pit Support in Severe Cold Area

结合本溪市威宁大街地下管廊工程狭长形基坑施工的实际,对其所在土层、周围环境、基坑特点及开挖条件进行分析,通过基坑支护设计、施工方案的比选,决定采用钢管桩加预应力锚索支护体系设计施工一体化的方式,并对钢管桩水平及基坑坡顶竖向位移进行监测。应用实践表明,该基坑支护体系安全、经济、施工速度快,值得推广应用。

Combined with the actual construction of a narrow and long-shaped foundation pit in the underground utility tunnel project of Weining Street in Benxi City, the soil layer, surrounding environment, features of foundation pit, and excavation condition have been analyzed in this paper. Through comparison of the foundation pit support designs and the construction schemes, it has been decided to use the integrated design and construction method of steel pipe piles and prestressed anchor cables supporting system, and to monitor the horizontal displacement of steel pipe piles and the vertical displacement of the foundation pit slope top. The application practice shows that the foundation pit support system is safe, economical, rapid for construction and worthy of popularization and application.