葛洲坝大江电厂尾水冲坑水下修补

本文介绍了采用可固定拖移式水上施工平台和水下不分散混凝土在20m水深条件下进行大面积、薄层浇筑水下混凝土的经验。取样试验结果表明：水下混凝土强度等主要技术指标达到设计要求，水下摄像检测表明：浇筑面比较平整，高程满足业主要求。

Underwater concreting in repairing tailwater scour holes in great river hydropower plant of Gezhouba project

This paper describes how to use the fixcable drown type floating operational platform and non-dispersible concrete to concrete a large area stncture at 20m water depth. The technique of underwater concreting is also applied to concrete the thin layer. According to the testing results,it is proved that the underwater concreting strength conforms with the design requirements and the pictures photoed under water indicate that the comcreting surface is rather smooth and the height satisfies our clients.