Start collaring with reduced throttle to the impact mechanism and feeding, let the bit work its way slightly into the rock. 开孔时,应采用最小的冲击和推进力,使钻头平稳地进入岩层。
Collaring the kidnapper is a close second. 其次,才是逮捕逮捕绑匪。
Also, studied key techniques about grouting in loosen rock mass, such as drilling technique, collaring sealing technique and so on. 并对松散体注浆工艺中的成孔技术、孔口封堵技术等关键技术问题进行了研究,这些问题的解决保证了松散体注浆工程的顺利进行。