超深基坑复杂条件下的土方开挖施工技术

Excavation and Construction Technology of Deep Foundation Pit under Complicated Conditions

南京金融城I区工程,其基坑面积及土方开挖量大,施工场地狭小,且紧靠地铁2号线,土方开挖施工困难。通过在第1道内支撑上设置栈桥作施工道路,解决土方开挖及地下结构施工的交通运输问题;分区、分层、分段进行土方开挖,降低了施工难度、加快了施工进度;基坑施工过程中实行全方位的基坑监测,保证了深基坑施工安全。

In the District I project of Nanjing Financial City, there are large foundation pit areas and large earthwork excavation. The construction site is small, close to Metro Line 2, and there are difficulties in earthwork excavation. By setting the trestle as construction road on the first road support, this article addresses the transport issues of the earth excavation and construction of underground structures. It carries out partitioning, hierarchical, segmented earthwork excavation to reduce the difficulty of construction and speed up the construction progress. The implementation of a full range of monitoring of foundation pit excavation in the construction process ensures the safety construction of deep foundation pit.