导流洞进出口组合式围堰拆除施工方法  

Demolition Construction Method for Combined Cofferdam at Inlet and Outlet of Diversion Tunnel

作　　者：韩加安 吴玉辉 谢凌宇 HAN Jia'an;WU Yuhui;XIE Lingyu(PowerChina Sinohydro Bureau 11 Co.,Ltd.,Zhengzhou 450001,China)

机构地区：[1]中国水利水电第十一工程局有限公司,郑州450001

出　　处：《西北水电》2023年第6期85-91,共7页Northwest Hydropower

摘　　要：导流洞是水电站大坝施工时的一种导流建筑物,在进行导流洞施工时,需在其进、出口修建挡水围堰,以保证其旱地施工。在导流洞施工完成,具备过流条件后,需对进、出口的挡水围堰进行拆除,为大坝截流、大坝围堰填筑顺利施工提供有利条件。导流洞围堰拆除的成功与否,对导流洞的过流至关重要。通过以坦桑尼亚朱利叶斯·尼雷尔水电站导流洞进出口组合式围堰拆除为例,总结了进出口围堰的拆除程序、方法和安全防护的关键技术,为同类围堰拆除施工提供借鉴。The diversion tunnel is a kind of diversion structure built during the dam construction of the hydropower station.During construction of the diversion tunnel,it is necessary to build a water retaining cofferdam at its inlet and outlet to ensure dryland construction.After the construction of the diversion tunnel is completed and the flow conditions are met,the retaining cofferdam at the inlet and outlet needs to be removed,so as to provide favorable conditions for river closure and dam cofferdam embankment.The success of the cofferdam removal of the diversion tunnel is crucial to the operation of the diversion tunnel.By taking the demolition of the combined cofferdam at the inlet and outlet of the diversion tunnel of the Julius Nyerere Hydropower Station in Tanzania as an example,key technologies such as the demolition procedures,methods and safety protection of the inlet and outlet cofferdam are summarized,which provides reference for the demolition construction of similar cofferdams.

关 键 词：导流洞 组合式 围堰 拆除 技术 

分 类 号：TV551.31[水利工程—水利水电工程]