城市高架工程承台基坑的快速施工方法

摘要

Due to the limitation of construction site,urban viaduct engineering usually involves higher demands for time control and construction efficiency.Based on the south extension of Jiading-Minhang Viaduct engineering,a fast construction technique of foundation pit for urban viaduct is introduced.In which,the Larssen sheet piling + steel support is adopted as the retaining structure for the convenient implementation and recycling.This technique has characters like mechanization and routinization in terms of construction,and adapts to single foundation in limited area or multiple foundations with shallow excavation.In general,this fast construction technique features high construction efficiency,strong applicability and short occupation of construction site.%由于城市高架工程施工场地的特殊性,建设过程中对工期控制及施工效率要求较高.以上海某高架工程南延段为例,介绍了城市高架工程承台基坑的快速施工方法:采用拉森钢板桩+钢支撑作为基坑的围护结构,易于施工且方便回收和重复利用;具有机械化、程序化的施工特点,能够很好地适应于单个基坑面积小、深度较浅但数量众多的基坑工程;施工效率高、对场地的适应性强、占地时间短.