压荷平衡深基坑支护体系的应用

Application of Pressure Load Balance Deep Foundation Excavation Supporting System

内支撑结构一般运用到跨度较大的基坑中,周边辅以地下连续墙或排桩支护,刚度大,安全性较好。但也有其使用的局限性,特别是多道内支撑支护结构会直接影响到土方开挖的顺序和进度、主体结构施工的进度、塔式起重机位置的确定等。结合某工程实例,在对深基坑支护方案分析的基础上,将压荷平衡法与钢筋混凝土灌注桩结合,形成单层内支撑挡土体系,应用于深基坑支护。实践表明,该方案取得了良好的效益。

Inner support is generally applied in large span foundation excavation with diaphragm wall or row of piles, it has good stiffness and security. But there are also limitations, especially in multi-channel support it will directly affect the order and progress of the excavation and the main structure, and the location of tower crane. Based on the engineering practice, according to the analysis on support scheme of deep foundation excavation, the pressure load balance method combined with reinforced concrete piles was adopted to form a single layer of support retaining system in deep foundation excavation support. Engineering practice shows that this method obtains good effect.