Along with the continuous exploitation and utilization of mineral resource, the production of people safety consciousness also unceasingly is strengthening, such as in the use of cable supporting construction matters needing attention, more and more people are concerned about. However, some of the company's quality management system is not perfect, worker technology quality is low, such as the pipe joint anchor rod installation problems more:
      Some 1 workers in order to speed up the bolt installation speed, the hammer struck the bolt, make its diameter tapering, slit width becomes small, and simply bolt saw the next section, but this will lead to the anchoring force is low, cannot well control the roof;
      2 tube seam anchor drill wear serious attention to replace, caused by drilling small diameter bolt installation, time-consuming effort, even cause the installation is not in place. No anchoring bolt;
      3 bolt holes do not pay attention when often move drill, drill direction change, and in a position to play multiple borehole; playing the top hole directly with long rod. The pipe joint anchor rod installation angle often do not comply with the design requirements.

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