Extremely-soft rock anchor rod structure and construction method

Abstract

The invention relates to the technical field of tunnel anchor rods and discloses an extremely-soft rock anchor rod structure. The extremely-soft rock anchor rod structure comprises a hollow anchor rodbody, a connecting sleeve, an expanding shell anchor head, a grout-stopping plug, a backing plate and a fixing nut, a limiting nut is mounted on the side, close to the connecting sleeve, of the hollow anchor rod body in threaded and sleeving modes, through grooves located between the limiting nut and the connecting sleeve are formed in the front surface, the rear surface, the upper surface and the lower surface of the hollow anchor rod body correspondingly, the hollow anchor rod body is internally provided with a movable block located in the through grooves, the movable block can move in thelimiting nut, and the front surface, the rear surface, the upper surface and the lower surface of the movable block are fixedly connected with linkage blocks correspondingly. A supporting rib is additionally arranged inside the hollow anchor rod body, the supporting rib is matched with the hollow anchor rod body and an anchoring agent inside the hollow anchor rod body, the bearing pressure of an anchor rod can be increased, the supporting effect of the hollow anchor rod body is improved, and the stability of tunnel supporting is improved.

Description

technical field [0001] The invention relates to the field of tunnel bolts, in particular to an extremely soft rock bolt structure and a construction method. Background technique [0002] The most basic component of the bolt tunnel support is to reinforce the surrounding rock of the tunnel, so that the surrounding rock can support itself and ensure the stability of the tunnel support structure. One end is connected to the engineering structure, and the other end goes deep into the ground. The whole bolt is divided into a free section and an anchor section. The free section refers to the area where the tension at the head of the bolt is transmitted to the anchor body. Stress, in some tunnel environments with extremely soft rock rings, grouting anchors are used for the channel, and anchoring agent is injected into the borehole through the grouting anchoring agent, and the anchoring agent is used to fill the soft rock gap and fix it. [0003] However, the existing ultra-soft ro...

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Problems solved by technology

[0003] However, the existing ultra-soft rock grouting bolt is a hollow bolt body. Although there is an anchoring agent in the pipe, its load-bearing effect is average and it is easy to be bent, which makes the support effect not good, and the existing ultra-soft rock grouting When the anchor rod is inserted into the borehole, because the rock in the tunnel is extremely soft rock, the broken soil cannot be cleaned with water, and there is a lot of soil in the borehole, which is easy to block the grout hole of the grouted anchor rod, reducing the injection of anchoring agent efficiency, which reduces the construction efficiency of the tunnel support structure

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