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Method for reinforcing shallow part of mine shaft with long anchor cable

A long anchor cable and shaft technology, which is used in mining equipment, earthwork drilling, installation of bolts, etc., can solve the deformation and cracking of the support body and the wellbore, the difficulty of closing the support layer to resist pressure, and the lack of support strength, etc. It can solve the problem of cracking and damage, achieve good supporting effect and long service life.

Inactive Publication Date: 2013-06-12
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the support for the return air shaft is carried out by means of anchor nets composed of double-layer anchor rods and metal meshes plus concrete grouting, and a closed support layer with a certain thickness is formed around the shaft. When there is an empty area nearby, the support strength is not enough, and the support body and shaft body often appear deformation and cracking. Through the observation and analysis of the cracks, it is believed that there is an empty area around the shaft wall of the return air shaft, and the surrounding strata often collapse and move. , the closed support layer is difficult to resist the pressure brought by the formation movement

Method used

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  • Method for reinforcing shallow part of mine shaft with long anchor cable
  • Method for reinforcing shallow part of mine shaft with long anchor cable

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Embodiment Construction

[0017] This embodiment takes the main return air shaft of the No. 2 mining area of ​​Jinchuan Group Company as an example to illustrate the reinforcement process implemented by applying the method provided by the present invention.

[0018] The shaft of the return air shaft has a net diameter of 6.5m and a depth of 720m. The wellbore of the return air shaft is located near the contact zone between the fault and the soft and hard rock formations, and the caving area is within 20m from the center of the wellbore. After using the anchor net plus concrete grouting method for support, the deformation and cracking of the support body appeared at 28m, 60m, 90m, and 125m of the wellbore. It was decided to adopt the reinforcement method provided by the present invention. The specific steps are as follows:

[0019] (1) Drilling: Set 12 drilling points evenly on a circle with the center of the return air shaft as the center and a radius of 12m, and drill holes at each drilling point to f...

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Abstract

The invention provides a method for reinforcing a shallow part of a mine shaft with a long anchor cable. The method is characterized in that the method comprises the following steps of (1) hole forming, (2) anchor cable fabrication and mounting, and (3) grouting, wherein in Step (1), drilling holes are formed uniformly in a circumference which takes the shaft center as a circle center and has a radius of 8-15m; the drilling holes are allowed to be positioned in a caved area around the shaft; drilling is conducted at the drilling holes; anchor cable holes are formed; in Step (2), 2-4 steel wire ropes are fixed together and lifted into the anchor cable holes; the bottom ends of the steel wire ropes are allowed to reach the bottoms of the anchor cable holes; rope bodies of the steel wire ropes keep vertical; and in Step (3), cement mortar is injected into the anchor cable holes for sealing the anchor cable holes. The method is good in supporting effect, can improve stratum compactness around the shaft, and fundamentally solves the problems that the shaft is cracked and damaged easily due to caving and movement of a mined stratum area; the service life is long; grouting repair is small; and the method is simple and low in construction cost.

Description

technical field [0001] The invention belongs to the technical field of mine support and relates to a method for shallow reinforcement of mine shafts by using long anchor cables. Background technique [0002] In mining production, the return air shaft is a common vertical shaft. Since the return air shaft is often located near the fault, there is a greater possibility of stress concentration, deformation, damage, and caving. Therefore, it is necessary to take necessary measures for the return air shaft. support measures. At present, the support for the return air shaft is carried out by means of anchor nets composed of double-layer anchor rods and metal meshes plus concrete grouting, and a closed support layer with a certain thickness is formed around the shaft. When there is an empty area nearby, the support strength is not enough, and the support body and shaft body often appear deformation and cracking. Through the observation and analysis of the cracks, it is believed th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D20/02
Inventor 杨志强王五松陈仲杰赵学科夏冬林张俊文陈丽娟吴彦良梅万春寇永渊汪小平
Owner JINCHUAN GROUP LIMITED
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