上海500kV虹杨变电站深基坑工程设计与实践

Design and Practice of the Deep Foundation Excavation in the Shanghai 500kV Hongyang Power Sub-station Project

上海500k V虹杨变电站工程基坑开挖深度为24m,周边环境条件复杂,且邻近住宅小区,基坑实施期间需减少扰民程度,给基坑工程的设计与实施带来了一系列技术难题:超深地下连续墙的设计与实施;逆作水平结构和临时支撑的设计与实施;超深基坑开挖对周边环境影响及控制。本工程基于逆作法的总体设计方案,采用了支护结构与主体结构全面结合的先进设计理念,成功实现了超深基坑的设计与实施。

The excavation area and depth of Hongyang Power Sub-station was about 24. 0 m. Surroundings environment of this excavation is complex. There are residential district buildings adjacently. The construction disturbs residents at the same time. A series of problems were encountered in the design and construction of this project. These include the design and construction of the deep diaphragm wall,design and construction of top-down structural beams and slabs,and impact of deep excavation on adjacent environment. The excavation was constructed by top-down method. The adoption of the advanced concept of deep excavation supported by permanent structure and other innovative techniques ensured the successful construction of the project.