结果表明，仰孔的排水效果明显优于铅孔。
Result shows that drainage effectiveness of upward hole has an obvious advantage over that of plumb hole.
介绍了尾水调压室大角度上仰孔锚索的施工方法。
The paper mainly introduced the construction method for anchor cable with large-angle upward hole in tailrace surge tank.
动力头及孔口板调转方向，可直接钻凿仰孔，大大增加钻孔倾角范围。
It can increase the hole inclination Angle range and drill elevation Angle holes, while setting the top drive power head and hole top plate toward the opposite direction.
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