板桩围堰在渡槽墩台基坑工程中的应用技术研究

Research on Application Technology of Sheet Pile Cofferdam in Aqueduct Pier Foundation Pit

为保证基坑稳定和基坑周边环境的施工安全,钢板桩围堰支护是较好措施之一。某渡槽墩台基坑工程施工场地为河流内,水位较高,结合基坑开挖支护工法和工程实际情况,合理选择适合该基坑钢板桩基坑支护方式,采用理论计算和理正计算相结合的方式,对钢板桩、内支撑、圈梁进行了强度校核和抗力校核,进行了封底混凝土抗浮验算、整体抗倾覆稳定性验算及抗隆起验算,并介绍了钢板桩基坑支护的施工要点。

Steel sheet pile cofferdam support is one of the effective measures to ensure the stability of foundation pit and construction safety of the surrounding environment of foundation pit.The construction site of an aqueduct pier foundation pit is in a river with high water level.Combined with the construction method of foundation pit excavation support and the actual situation of the project,the suitable supporting method of steel sheet pile foundation pit is selected reasonably.The strength and resistance of steel sheet pile,internal support and ring beam are checked by combining theoretical calculation and Lizheng calculation.Then the anti-float check of base sealing concrete,the anti-overturning stability check and anti-uplift check were carried out.And the key points of steel sheet pile foundation pit support construction are introduced.