A very soft rock bolt structure and construction method
A construction method and technology of extremely soft rock, applied in the installation of bolts, earth-moving drilling, mining equipment, etc., can solve the problem of reducing the construction efficiency of tunnel support structures, easy to block the grouting holes of the grouting bolts, and the load-bearing effect is average. And other issues
Active Publication Date: 2021-04-23
ZHONGCHUAN NO 9 DESIGN & RES INST
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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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[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0026] see Figure 1-4 , a very soft rock bolt structure, including a hollow bolt body 1, a connecting sleeve 2, an expansion shell anchor head 3, a grout stopper 4, a backing plate 5 and a fixing nut 6, and one side of the hollow bolt body 1 is provided with There is a sealing plug 107. The sealing plug 107 seals the interior of the hollow anchor body 1. After the anchoring agent is injected, the sealing plug is used to seal it to prevent the anchoring agent ...
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The invention relates to the technical field of tunnel bolts, and discloses a very soft rock bolt structure, which includes a hollow bolt body, a connecting sleeve, an expansion shell anchor head, a grout stopper, a backing plate and a fixing nut. The limit nut is threaded on the side of the rod body close to the connecting sleeve, and the front surface, the rear surface, the upper surface and the lower surface of the hollow anchor body are provided with through grooves between the limit nut and the connecting sleeve. The inside of the hollow anchor rod body is provided with a moving block located at the through groove, and the moving block can move in the limit nut, and the front surface, the rear surface, the upper surface and the lower surface of the moving block are respectively fixedly connected with Link block. By setting another support rib inside the hollow anchor body, the support rib can be used to cooperate with the hollow anchor body and the anchoring agent inside, which can increase the bearing pressure of the anchor and improve the support of the hollow anchor body. The effect of tunnel support is improved, and the stability of tunnel support is increased.
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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IPC IPC(8): E21D21/00E21D20/02
CPCE21D20/003E21D20/02E21D21/0026E21D21/008
Inventor 金国龙李昀王鑫周竝符晓赟田振李小军陈狄明洪杰
Owner ZHONGCHUAN NO 9 DESIGN & RES INST