论文部分内容阅读
在复杂地层中进行跟管钻进和施工大吨位预应力锚固孔,都需要采用一种能够自动伸缩的扩孔钻具。《地质与勘探》曾在1986年第8期封底上介绍了一种液压伸缩扩孔钻具,引起了笔者和许多工程钻探工作者的注意。这种钻具的工作原理是利用水泵的冲洗液挤压活塞,压迫弹簧,推动活塞杆、推盘、刀杆共同下行,通过铰链机构变活塞的轴向移动为刀杆的径向位移,完成扩孔工
In complex formations with pipe drilling and construction of large-tonnage prestressed anchoring holes, require the use of a self-expanding reaming drill. Geology and Exploration introduced a hydraulic reaming reaming drill on the back cover of the eighth issue of 1986, arousing the attention of the author and many engineering drillers. The working principle of the drilling tool is that the piston is pressed by the flushing liquid of the pump, the spring is pressed, the piston rod is pushed, the pushing disc and the cutter bar are jointly descended, the axial displacement of the piston is changed by the hinge mechanism to the radial displacement of the cutter bar, Reaming workers