多扶正器防斜钻具组合在大岗山水电站帷幕灌浆工程中的应用

Application of Multi-stabilizer Anti-deflection BHA in the Curtain Grouting Engineering at Dagangshan Hydropower Station

摘要:

大岗山水电站帷幕灌浆工区施工局限性显著、地层自然造斜力强，灌浆孔孔斜设计要求高，其顶角要求≤0.5?/100 m，防斜技术难度大。采用多扶正器防斜钻具组合，有效地限制了灌浆孔轴线顶角变化和孔底偏移量，控制了灌浆孔弯曲偏斜，灌浆孔成孔质量明显提高，获得了较好的经济效益。

Abstract:

The dykes of curtain grouting work area in Dagangshan hydropower station are steep and the environmental limitation and natural deflecting force of formation are significant. So the design of hole-deflection is strict and the vertex angle requirement is up to ≤ 0.5 °/100 m. By using multi-stabilizer anti-deflection BHA, the grouting hole axis vertex angle changing and hole bottom offset were effectively limited and the grouting hole bending deflection was controlled with the quality of grouting holes significantly improved.