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水库输水洞进口检修闸门埋件更换工程 ,原设计在洞口上游修建临时挡水土石围堰 ,现改用输水洞进口水下封堵方案 ,新方案采用了水下清淤、水下切割、水下电焊、水下浇注PBM -3聚合物混凝土、水下浇注快干水泥、水下堵漏等技术 ,虽然施工有一定难度 ,但比原方案节约投资 ,并缩短了输水洞施工围堰工期
The original design of the project is to construct a temporary retaining earth and rock cofferdam in the upper reaches of the entrance of the tunnel. Now, it will switch to a submarine plugging scheme for the entrance of the water tunnel, and the new scheme adopts underwater dredging and underwater cutting , Underwater welding, underwater casting PBM-3 polymer concrete, underwater pouring fast-drying cement, underwater plugging and other technologies, although the construction has a certain degree of difficulty, but compared with the original program to save investment and shorten the construction of water tunnel Weir construction period