水电站尾水壅水堰堰体水下施工关键技术

针对闽江水口水电站尾水位因河流下切和坝下无序采砂降低约4.4 m,已严重威胁发电机组正常运行与电网供电安全这一情况,为治理该水电站尾水位病害,提出尾水壅水堰治理措施,并对其有效性进行了模型试验验证。为了实现在不停机的条件下完成尾水雍水堰工程的水下施工作业,提出了半圆柱壳体水下缓流施工平台技术、缆索吊装、水平牵引就位施工新方法,以及翻转刚性托板、就位钢丝笼施工新工艺等施工关键技术。

Key technology for underwater construction of tail water weirs of hydropower stations

The tail water level of Shuikou Hydropower Station on Minjiang River has been lowered about 4.4 m because of river-downcutting and unordered sand-excavating,resulting in severe threat to the running of the electronic generators and the power supply safety of electric network.In order to deal with the tail water level,the relevant measures for the tail water weir were put forward,and their validity was verified by use of model tests.In order to complete the underwater construction of the tail water weir under running conditions of the electronic generators,several key construction techniques were proposed,including semi-cylindrical shell sluggish flow underwater construction platform,new construction method with cable lifting and horizontal trailing as well as new process with upset rigid brace and path wire basket.