关键词: 续建工程, 浑水摄像系统, 水下模板定位安装, 水下混凝土浇筑, 闸门井封闭, 干地施工

Abstract: The lower reservoir of Huanggou pumped storage power station is the existing Lianhua reser- voir. The inlet/outlet structure of the lower reservoir constructed in early stage has been submerged. The continued project is the first domestic hydraulic structure that adopts underwater construction technolo- gy. A camera system for turbid water is developed during construction, and construction tech such as un- derwater formwork positioning and installation, underwater welding of steel bars and underwater concret- ing by placing machine are used. A underwater sealing device for gate well is designed to achieve dry construction for embedded parts and the phase Ⅱ concrete.

Key words: extension project, camera system for turbid water, underwater formwork positioning and in- stallation, underwater concreting, gate well sealing, dry construction