论文部分内容阅读
QJ250型灌注桩钻孔机是由郑州勘察机械厂研制成功的,并通过了部级鉴定。该钻机采用一套钻具适用于正反循环两种钻进工艺,并可实现气举、泵吸两种循环钻进方
The QJ250 cast-in-place pile drilling machine was successfully developed by Zhengzhou Investigation Machinery Factory and passed the ministerial appraisal. The drilling rig uses a set of drilling tools for two types of forward and reverse circulation drilling technology, and can achieve gas circulation, pumping two circulation drilling side