Underwater Plugging Construction Technique of Surface Spillways in the Danjiangkou Dam Heightening Project
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Abstract:
Dry land is a critical working condition for concrete pouring of the overflow dam heightening project of the Danjiangkou dam. Different schemes were compared and the combination method of cavity concrete stop logs with underwater concrete pouring and steel stop log gates was selected. During the construction, several problems were solved such as the installation positioning of concrete stop logs, grouting stopping before pouring, underwater concrete pouring, added underwater sills of steel stop log gates, and later leakage treatment. Moreover, the gate sills were installed and leveled under water for the first time and the new type of anti-washout and self-compacted polymer?resin concrete was used as the secondary concrete for sill embedded parts to form a complete sill sealing structure, which has good effects on the construction.
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