应用反井钻机开挖导井可达到快速安全的效果。
Application of inverse well drill will permit quick and safe excavation of pilot shaft.
简述了反井钻机的工作特点及其在吉沙水电站工程的应用，给出了施工程序及质量保证措施。
The working traits of raising drilling rig and its application in Jisha Power Station are depicted briefly. Construction procedure and measures for quality guarantee are offered.
反井法施工斜井为自下而上进行，适合倾角不大的斜井施工，但不适宜运用于断面较大的斜井。
On the contrary, the back well drill method is from bottom to top, which is suitable for the small inclined Angle, but not for the large shaft section.
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