库区堆积体上围堰的施工技术研究

Construction Technology of Cofferdam on Accumulation Body in Reservoir Area

胜利水电站灾后重建工程为“4·20”芦山地震后原胜利水电站扩机改造工程,其新建进水口及老溢流坝加固改造工程的水下部分施工安排在“二枯”原电站停机5个月期间实施,工期紧、任务重,且新建进水口为窑洞式,结构复杂,施工难度大,致围堰施工的成败为工程进度目标能否按期实现的关键。结合实际施工过程,从围堰施工方案的制定与优化、防渗处理等方面详细阐述了库区堆积体上围堰修建采用的施工技术。

The post-disaster reconstruction project of Shengli Hydropower Station is the expansion and reconstruction project of the original Shengli Hydropower Station after the“4·20”Lushan Earthquake.The construction of the new water inlet and the underwater part of the old overflow dam reinforcement and reconstruction project is arranged to be implemented during“the second dry period”,the 5 month shutdown of the original Hydropower Station.The construction period is tight and the task is heavy,and the new water inlet is a cave dwelling structure,which is complex and difficult to construct.The success or failure of cofferdam construction is the key to the realization of the progress target on schedule.Combined with the actual construction,this paper expounds in detail the successful application examples of cofferdam construction technology on the accumulation body in the reservoir area from the aspects of cofferdam construction scheme,construction optimization and anti-seepage treatment.