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柳洪水电站地下压力管道由3个平段2、个斜段组成。上下部分导井分别采用反井钻及人工开挖,通过改造钻机基架、控制钻速、合理使用稳定钻杆等措施,开挖斜井导洞124 m,成孔向下偏斜仅1.2 m,偏斜率约为1%。
The underground pressure pipeline of Liuhong Hydropower Station is composed of 3 flat sections 2 and an oblique section. The upper and lower guide wells were drilled by reverse drilling and manual excavation respectively. Through the measures such as rebuilding drilling frame, controlling the drilling rate and using stable drill rod reasonably, the guide tunnel of inclined shaft was excavated 124 m and the deviation of formation hole was only 1.2 m , The skew rate is about 1%.