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Multi-section type hollow grouting cable anchor and supporting method

A grouting anchor cable, multi-stage technology, applied in tunnels, geotechnical engineering, underground engineering anchor cable support, mining fields, can solve the problem of multi-level segmented grouting reinforcement, uneven diffusion of grout in boreholes, The problem of low grouting amount in deep rock cracks can achieve the effect of improving the grouting effect, increasing the amount of grouting, and improving the bearing capacity

Active Publication Date: 2019-12-24
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above analysis, the present invention aims to provide a multi-stage hollow grouting anchor cable and a supporting method to solve the problem that the existing grouting anchor cable cannot carry out multi-level segmental grouting reinforcement and drilling for deep surrounding rocks. Inhomogeneous diffusion of internal grout leads to low grouting volume and poor support effect in deep rock formation fissures

Method used

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  • Multi-section type hollow grouting cable anchor and supporting method
  • Multi-section type hollow grouting cable anchor and supporting method
  • Multi-section type hollow grouting cable anchor and supporting method

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Experimental program
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Effect test

Embodiment 1

[0038] A specific embodiment of the present invention discloses a multi-section hollow grouting anchor cable, such as to 1 image 3 As shown, the cable body 3 is included, the cable body 3 is composed of a plurality of steel strands 11 spirally wound around the grouting pipe 8, the spirally wound steel strands 11 wrap the grouting pipe 8, and the pitch of the wound steel strands 11 is greater than The diameter of the steel strand 11; the grouting pipe 8 is provided with a plurality of flow-limiting components, and the multiple flow-limiting components divide the grouting pipe 8 into a plurality of segmented pipelines; wherein, the flow-limiting components can divide two adjacent segments The pipelines are separated and can be opened under the threshold pressure of the flow-restricting assembly to connect the adjacent two segment pipelines. Open under a certain hydraulic pressure to connect the adjacent two segmented pipelines; a slurry outlet 10 is set on the flow limiting com...

Embodiment 2

[0047] The multi-section hollow grouting anchor cable of this embodiment uses the grouting anchor cable sealing assembly 1 to replace the plug in the first embodiment to seal the grouting port of the grouting pipe 8, as Figure 5 to Figure 6 As shown, the grouting anchor cable sealing assembly 1 includes a housing 1-8, a spring 1-3 and a grout stop piston 1-4, and the housing 1-8 is provided with a piston chamber for installing the grout stop piston 1-4. The grout stop piston 1-4 is located in the piston cavity and can move in the piston cavity; one end of the grout stop piston 1-4 is fixedly connected with the bottom wall of the piston cavity by a spring 1-3, and the other end of the grout stop piston 1-4 One end is a free end, and the free end can be in contact with the slurry entering the piston cavity, that is to say, the tail end of the slurry stopper 1-4 is connected to the spring 1-3, and the head end of the slurry stopper 1-4 can be connected to the piston cavity. In c...

Embodiment 3

[0059] This embodiment provides a support method, using the multi-section hollow grouting anchor cables in Embodiment 1 and Embodiment 2 for support, including the following steps:

[0060] The first step: Determine the grouting parameters and make preliminary preparations. According to the geological general situation and production conditions, the grouting parameters of the grouting anchor cable are determined, wherein the grouting parameters include the number of segmented pipelines of the grouting pipe 8, the pipe diameter, the diameter and the quantity of the steel strand, and the diameter and quantity of the anchor cable hole 13. Hole diameter and depth, grouting pressure, etc. Determine the number of grouting sections according to the actual conditions, wherein the grouting pipe 8 is n sections, and the expansion pipe 2 is n-1 sections; the grouting pump is arranged in the designed roadway, and the anchor cable hole 13 is pre-drilled in the roadway coal rock mass 7 acco...

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Abstract

The invention relates to a multi-section type hollow grouting cable anchor and a supporting method, and belongs to the technical field of tunnel supporting. The problems are solved that an existing grouting cable anchor cannot conduct multi-layer multi-section type grouting reinforcing on deep surrounding rock and slurry in drilled holes cannot be evenly dispersed, so the grouting volume is low and the supporting effect is poor on fractures in a deep rock layer. The multi-section type hollow grouting cable anchor comprises a cable body. The cable body is formed by spirally winding a pluralityof steel strands on a grouting pipe. A plurality of passage limiting assemblies are arranged on the grouting pipe and divide the grouting pipe into a plurality of segmented pipelines. The passage limiting assemblies can partition every two adjacent segmented pipelines and can be opened under the threshold pressure of the passage limiting assemblies so that every two adjacent segmented pipelines can communicate. The multi-section type hollow grouting cable anchor is simple in structure, convenient to operate and good in supporting effect and can conduct multi-layer multi-section type grouting reinforcing on the deep surrounding rock.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to the technical field of anchor cable support for mines, tunnels and underground engineering, and in particular to a multi-stage hollow grouting anchor cable and a support method. Background technique [0002] With the continuous increase of coal mining depth, the complexity of roadway topography is constantly changing, which is mainly reflected in the serious fracture of surrounding rock and stress concentration. Nearby and roadways affected by dynamic pressure. The grouting anchor cable can effectively inhibit the occurrence of joints and cracks in the surrounding rock, and can also prevent the rock mass and the grouting slurry in the surrounding rock from forming stones again. Inject into the pores, cracks and other structures of the rock and soil to make the rock and soil become a new structure with high strength, good impermeability and high stability, so as ...

Claims

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Application Information

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IPC IPC(8): E21D21/00E21D20/02
CPCE21D20/02E21D21/0026E21D21/0073
Inventor 回新冬姚强岭朱柳李学华徐强
Owner CHINA UNIV OF MINING & TECH
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