Self-drilling differential grouting combined anchor rod and method for anchoring same

Abstract

The invention discloses a self-drilling differential grouting combined anchor rod and a method for anchoring the same. The self-drilling differential grouting combined anchor rod comprises a drill bit, a grouting pipe, a spindle, an anchor head mechanism and an anchor tail mechanism. The anchor head mechanism comprises a fixed ring, a slip ring, a limit pipe and a plurality of pairs of driven connecting rods and driving connecting rods. The anchor head mechanism can be matched with fracturing grouting, so that the stability of inner anchor ends of the self-drilling differential grouting combined anchor rod can be guaranteed. The anchor tail mechanism comprises an anchor disc, a connecting cap, a spring and a nut; the grouting pipe and the spindle can deform in a coordinated manner by the aid of the connecting cap, joint bearing effects can be realized by the grouting pipe and the spindle, and the self-drilling differential grouting combined anchor rod can be timely in driving support states by the aid of the spring and can be in the driving support states for a long term. The self-drilling differential grouting combined anchor rod has the advantages that drilling, inner anchor end reaming and fracturing grouting can be carried out on weak broken surrounding rock by the aid of the self-drilling differential grouting combined anchor rod, and permeation grouting can be carried out on remaining sections by the aid of the self-drilling differential grouting combined anchor rod; the surrounding rock in small ranges around the grouting pipe can be anchored by the grouting pipe in a full-length anchoring mode; squeezing reinforcing effects can be realized by the spindle for the surrounding rock in large ranges including anchoring regions of the grouting pipe, the anchoring regions of the grouting pipe and anchoring regions of the spindle act with one another, the synergistic bearing effects can be realized by the grouting pipe and the spindle, and accordingly support effects can be improved.

Description

technical field [0001] The invention relates to soft and broken geotechnical engineering supporting workpieces and a supporting method, in particular to a self-drilling type differential grouting combined anchor rod and an anchoring method thereof. Background technique [0002] The support of weak and broken surrounding rock is one of the difficulties in the field of geotechnical engineering stability control. At present, the common and effective treatment method for this kind of surrounding rock is to firstly strengthen the broken surrounding rock by grouting, and then use anchor rods, anchor cables, etc. to support the grouted surrounding rock. [0003] The grouting process is usually accomplished using conventional grouting bolts or self-drilling grouting bolts. The conventional grouting bolt has simple structure, easy processing and low cost, but it is not easy to enter the hole due to the impact of the collapsed hole, and it needs to be specially fixed and sealed, whic...

AI Technical Summary

Problems solved by technology

The conventional grouting bolt has simple structure, easy processing and low cost, but it is not easy to enter the hole due to the impact of the collapsed hole, and it needs to be specially fixed and sealed, which increases the construction process and is not conducive to rapid construction; self-drilling The grouting anchor avoids the impact of hole collapse, but it still needs to be fixed and sealed before grouting

[0004] The more critical problem is that since grouting reinforcement and threaded steel bolt support are often carried out in two steps in sequence, on the one hand, the drilling workload is heavy and time-consuming, which not only seriously restricts the construction progress, but also greatly increases the project cost. cost; on the other hand, there is a lack of organic connection between the grouted anchor rod and the threaded steel anchor rod, the synergistic anchoring effect is weak, and the anchoring performance and reliability of the support system are low

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