钢筋混凝土栈桥在软土深大基坑的设计和实践

Design and Application of Reinforced Trestle Bridge in Deep Excavations in Soft Soils

随着我国地下空间利用水平的不断提高,采用钢筋混凝土支撑型式的深大基坑越来越普遍,从而使得基坑土方开挖和运输的难度也越来越大。因此,设置专门的出土栈桥已成为深大基坑支护设计过程中不可或缺的重要环节。针对红树湾物业开发项目的软土深大基坑,根据周边环境复杂及施工场地狭窄等因素,通过设置钢筋混凝土栈桥式来提高土方运出的效率,并根据钢筋混凝土框架结构盖板体系的计算方法进行受力分析,取得了较好的效果,可为类似基坑工程提供参考。

Due to the increasing improvement of the underground space utilization,the deep excavation using the reinforced concrete support is more and more popular.As a result,the excavation and transportation waste soils are also increasingly difficult.Therefore,the trestle bridges that for the waste soil transportation have become an integral part deep excavation support design process.The Hongshuwan real estate large area and depth deep excavation case history is presented in this paper.This site had constrained excavation area and sensitive adjacent surrounding environment.A reinforced concrete temporary trestle bridge was designed to improve the waste soil transportation efficiency.The trestle bridge was analyzed by using the same approach for the design of reinforced concrete slab in the frame structure.