低净空条件下地下连续墙施工技术研究

地下连续墙作为城市地铁围护结构常用的支护方式,施工工艺受周围环境影响较大。针对长沙地铁5号线华雅站,高架桥下净空有限成槽、钢筋笼吊装入槽无法正常施工的情况,提出了方锤配合冲击钻成槽、折臂吊分节吊装、钢板焊接连接等解决方案,并对毗邻的高架桥提出了桥墩沉降监测、注浆加固的保护措施。现场施工验证了该施工工艺的合理性,对同类工程施工有一定借鉴意义。

Research on Construction Technology of Underground ContinuousWall underConditions of Low Headroom

As a supporting method the underground continuous wall is commonly used for urban subway structure,and the construction process is largely influenced by the surrounding environment. The forming slot by limited spaceunder the viaduct and lifting the steel cage into the groove can not be normal construction at Huaya station ofChangsha Metro Line 5. In this paper, with the side hammer impact drill into the groove, the section folding armcrane lifting steel plate welded connections solutions, and the concrete protection measures of settlement monitoringand grouting reinforcement for the viaduct are put forward. Site construction confirmed the rationality of theconstruction process, and the experience can provide reference in the similar case.