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An extendable anchor

A technology of bolts and rods, which is applied in the installation of bolts, mining equipment, earthwork drilling and mining, etc. It can solve the problems that long bolts cannot be constructed, the elongation rate of anchor cables is low, and the roadway is easy to fail, so as to maintain the stability of the roadway, Improve the anchoring effect and reduce the effect of roof fall accidents

Active Publication Date: 2018-04-24
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, due to the limitation of roadway space, long anchor rods cannot be constructed, and only anchor cables can be used to control the roof
However, the elongation rate of the anchor cable is low, and it is easy to fail when the deformation of the roadway is large, causing a roof fall accident

Method used

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Examples

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Effect test

Embodiment approach

[0028] According to an exemplary embodiment, the rod body 1 includes at least two interconnected rods 11. The rods 11 are made of metal with a certain strength. In the embodiment of the present invention, they can be made of threaded steel, or other materials known in the art. Threaded connection or other detachable connection methods known in the art can be used between the two interconnected rods 11 . A connecting sleeve 5 is also provided on the outer side of the connecting ends of the two rods 11 . The connecting sleeve 5 covers the outside of the connecting ends of the two rods 11, and is fixedly connected to the two rods 11 through more than one fixing device 4. The connecting sleeve 5 can be made of rigid material, or other Other materials that can achieve strength, the present invention does not limit its specific materials, the main purpose of using rigid materials is to increase the strength of the rod body 1, there is also an accommodation space 51 inside the conne...

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Abstract

The invention discloses an extensible anchor rod. The extensible anchor rod comprises a rod body, a tray and a tip, wherein the tray and the tip are arranged at the two ends of the rod body correspondingly; the tray is detachably arranged at one end of the rod body; the tip is arranged at the other end of the rod body through one or more fixing devices; the rod body comprises at least two rod pieces connected with each other; a connection sleeve and an expansion sleeve are arranged outside the connecting end of the two rod pieces connected with each other; the connection sleeve wraps the outer side of the connecting end of the two rod pieces, and is fixed to the rod pieces through one or more fixing devices; the expansion sleeve wraps other portions of the rod pieces; a fixing sleeve is arranged on the side, close to the tip, of each rod piece; and the fixing sleeves are fixed to the rod pieces and the tip through one or more fixing devices. By means of the extensible anchor rod, the problems that long anchor rods cannot be used as the space of a current coal mine tunnel is not sufficient, and the anchoring force of anchor rods is not enough can be solved.

Description

technical field [0001] The present invention relates generally to a bolt, and in particular to an extendable bolt. Background technique [0002] With the development of bolting technology in coal mines, the application range of bolting continues to expand, but under certain conditions, the application of long bolts will be limited by the underground space. At present, the height of my country's coal mine roadway is generally 2.0-3.5m. For the convenience of construction, the length of the anchor rod does not exceed 3m. When the thickness of the roadway roof is broken, a longer anchor rod is required for maintenance. 6m to prevent roof fall accidents. Obviously, due to the limitation of the roadway space, the long anchor rod cannot be constructed, and the roof can only be controlled by the anchor cable. However, the elongation rate of the anchor cable is low, and it is easy to fail when the deformation of the roadway is large, causing a roof fall accident. [0003] The abov...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D21/00
CPCE21D21/0006E21D21/0046
Inventor 郭鹏飞杨晓杰
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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