基坑盖板下逆作车站地下连续墙托换破除技术
Underpinning Methods of Diaphragm Wall of Subway Station Constructed by Cut and Cover Reverse Method under Foundation Pit Cover Plate
罗鹏 1刘映晶 1卢敬科 1林廷松 2朱汉华1
作者信息
- 1. 中天建设集团有限公司,浙江杭州 310000
- 2. 杭州市建设工程质量安全监督总站,浙江杭州 310000
- 折叠
摘要
附属结构与地铁车站连通常需要对地下连续墙进行破除,当地下连续墙上设有临时承重盖板时破除的施工难度更大,风险更高.以某地铁盖挖逆作车站的地下连续墙破除施工为依托,提出了利用局部破除体作为临时竖向支撑进行托换破除的施工方法.首先,采用数值计算分析了不同托换间距对盖板结构体系的受力影响,综合施工进度和作业空间考虑,确定预留 1 m宽的临时托换柱和不大于 12 m的破除间距为控制指标,能够满足各受力结构体系在临时托换施工下的承载性能要求;其次,对盖板下地下连续墙破除及切割块转运施工进行了详细分析,给出了分块尺寸、切割块吊装、预留柱节点等关键施工环节的控制指标与做法.实施结果表明:利用既有地下连续墙作为临时托换结构进行破除地下连续墙的施工方法,安全可靠,施工速度快,成本经济.
Abstract
The connection between the auxiliary structure and the subway station usually requires breaking the diaphragm wall,which is more difficult and risky when a temporary cover plate is installed on the diaphragm wall.Based on the demolition construc-tion of the diaphragm wall of a subway station constructed by cover and top-down construction method,a construction method of un-derpinning demolition using a local demolition body as temporary vertical support was proposed,and the problem was solved.First of all,the influence of different underpinning distances on the structural system of the cover plate was calculated numerically,and consid-ering the construction progress and workspace,the temporary underpinning columns with a width of 1 m and a breaking distance of no more than 12 m were determined as the control indicators,which can meet the load-bearing performance requirements of each stressed structural system under temporary underpinning construction.Secondly,the demolition of the diaphragm wall under the cover plate and the transfer construction of the cut blocks were detailed,and the control indicators and practices of key construction links such as block size,cutting block hoisting,and reserved column nodes were given.The implementation results showed that using the existing dia-phragm wall as a temporary underpinning structure for the construction of the diaphragm wall is safe,reliable,fast in construction,and economical in cost.
关键词
盖板/托换间距/地下连续墙破除/数值计算/绳锯切割Key words
cover plate/underpinning distance/diaphragm wall demolition/numerical calculation/wire saw cutting引用本文复制引用
出版年
2024
NETL
NSTL
万方数据