摘要： 本文叙述了采用PBM-3聚合物混凝土，通过导管在龚嘴水电站10号冲沙底孔水下58 m水深范围内，整体修补了一个封水面，使浮体闸门一次性封水成功。

Abstract: This article introduces the experience on repairing sealing surface whole by duct casting PBM-3 polymer concrete in the scope under water 58m, which made floating gate sealing successonly by one effort.