Application of inverse well drill will permit quick and safe excavation of pilot shaft.
应用反井钻机开挖导井可达到快速安全的效果。
The pressure of the under well drill rod which even works in the caustic medium is extremely complex.
钻柱在井下的受力极度复杂，甚至工作在腐蚀性介质中。
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.
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.
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。
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