小湾水电站导流洞下闸施工技术

Construction Technology for Gate Closing of Diversion Tunnel,Xiaowan Hydropower Project

小湾水电站导流洞下闸前进行了2次水下探摸,查清门槽、底坎实际情况后制定了合适的下闸、堵漏方案,并在下闸前进行全面的演练,使所有人员熟悉下闸流程,确保下闸顺利进行。下闸后根据门后漏水情况及时进行了堵漏作业,采用水下混凝土堵漏取得了良好的效果。

Before the diversion tunnel of Xiaowan Hydropower Project is gated. Exploration under water is executed twice. The suitable scheme for gate closing and leakage blocking is finalized after the actual conditions of sills and slots are made clear. Full exercises are performed before the gate is closed so that all participants well acknowledge the closing flow to assure the smooth gate closing operation. Leakage behind the gate is blocked in time based on the actual leakage after the gate is closed. Application of concrete placement under water for the leakage blocking achieves excellently.