深基坑施工中的支撑置换与提前拆除

Support Replacement and in Advance Demolition in Deep Foundation Pit Construction

当深基坑围护体系采用"地下连续墙+混凝土支撑+格构柱"的结构形式时,在地下结构施工期间,可根据设计及施工工况提前进行支撑的置换与拆除工作。这种方法的灵活应用,不仅能确保现场按照施工要求进行流水作业,而且能最大限度地减少地下结构的施工工期,大大降低了时间因素带来的安全风险。经对应用工程的测定,安全、工期、成本控制都达到了预期的目标,取得了很好的实施效果。

When the structural forms of ＂underground diaphragm wall ＋ concrete support ＋ latticed columns＂ were used for the deep foundation pit support system in construction process of underground structure, the in advance replacement and demolition of excavation supports can be carried out according to design and construction condition. The flexible application of such method not only can ensure the on-site flow process based on the construction requirements, but also can sharply minimize the construction period of underground structure, which can greatly reduce the safety risk caused by time factor. After determination of such application in engineering construction, the safety, the construction period and the cost control have all met the expected goal and achieved good implementation results.