深厚粉细砂层沉井综合助沉施工技术的研究与应用  

Research and Application of Comprehensive Sinking-aided Construction Technology for Open Caisson in Deep Silty Fine Sand Layer

作　　者：罗婷尹 LUO Tingyin(Guangdong Foundation Engineering Group Co.,Ltd.,Guangzhou,Guangdong,510700,China)

机构地区：[1]广东省基础工程集团有限公司,广东广州510700

出　　处：《建筑施工》2021年第7期1343-1345,1356,共4页Building Construction

摘　　要：结合江高净水厂配套主干管网工程、人和2号泵站(扩建)施工(标段一)项目中的沉井助沉施工实践,针对在深厚粉细砂层地质条件下沉井下沉至设计标高最后1.5~2.5 m停滞的施工难题,介绍了钢板桩围堰+井内环形冲孔成槽+分级配重的沉井综合助沉施工技术,分别对关键施工工艺进行了阐述。项目实施效果较好,可为类似工程提供参考。Combined with the sinking-aided construction practice of open caisson in Jianggao water purification plant supporting main pipe network project and Renhe No.2 pumping station(extension) construction(bid section I), aiming at the construction problem of caisson sinking to the last 1.5-2.5 m of design elevation stagnation in deep silty fine sand layer, the paper introduces the comprehensive sinking-aided construction technology of steel sheet pile cofferdam, annular punching and grooving in well and grading counterweight and describes the key construction technology respectively. The implementation effect of the project is good, which can provide reference for similar projects.

关 键 词：粉细砂层 下沉停滞 冲孔成槽助沉 沉井施工 钢板桩围堰 

分 类 号：TU99[建筑科学—市政工程]