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三峡水利枢纽三期工程钢管底部回填灌浆采用塑料拔管法施工,灌浆前应压风检查缝隙串通情况,风压小于灌浆压力,采用锤击法检查确定脱空范围。
The backfilling grouting at the bottom of the steel pipe of the third phase of the Three Gorges Project is to be carried out by plastic pipe extubation. Before the grouting, air pressure is required to check the collusion of cracks, and the wind pressure is less than the grouting pressure.