关键词: 超深混凝土防渗墙, 施工工效, 单价计算方法

Abstract: As more and more hydropower projects adopt the extra-deep (more than 100 m) concrete cutoff wall for seepage control treatment at dam foundation, the current estimated budget quota of hydropow⁃ er projects can not meet the demand of unit price calculation of concrete pouring projects. Taking the hidden risk treatment by extra-deep (148 m) concrete cut-off wall in Shiziping hydropower station as ex⁃ ample, the digital image technology is used to measure and analyze the concrete pouring efficiency for a year, and the relationship between average pouring efficiency and depth of extra-deep concrete cut-off wall is obtained. On this basis, combined with the relevant technical specifications, the calculation meth⁃ od and key points for unit price of extra-deep concrete cut-off wall pouring project are put forward.

Key words: extra-deep concrete cut-off wall, construction efficiency, calculation method of unit price