冲击钻在糯扎渡水电站闸门井导井施工中的应用

Application of percussion drill to construction of pilot heading for excavation of gate shaft of Nuozhadu Hydropower Station

糯扎渡水电站右岸泄洪洞事故检修闸门井垂直深度143.2 m,导井的开挖方法是关键难点。采用冲击式钻机(即冲击钻)进行闸门井的导井施工,提高了工效,节约了成本,降低了施工安全风险。

The vertical depth of the shaft for the emergency service gate of the flood discharge tunnel on the right bank of Nuozhadu Hydropower Station is 143.2 m; for which key difficulty in the construction is the excavation method for the pilot heading. During the construction the pilot heading, percussion drill is adopted, and then, not only the construction efficiency is increased and the eonstruction cost is saved, but the risk of the construction is also lowered.