Continuous and multilayer pre-support method of short downward anchor cable

A technology of pre-support and short anchor cable, which is applied in earth-moving drilling, bolt installation, mining equipment, etc., can solve the problems of unsafe support, easy to fall off, complicated support process, etc., and achieve the operation strength and installation cost. The effect of low, simple processing and production, and simple installation process

Active Publication Date: 2013-02-13
SANSHANDAO GOLD MINE SHANDONG GOLD MINING LAIZHOU
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing problems: complex support process, low efficiency, high cost, easy to fall off during support; support equipment is large, stope support cannot be completed under a small section, and the support operation itself is unsafe when the stope exposed area is large; The anchor cable has not taken root and is easy to fall off later
Existing problems: the support range is small, the support effect on broken and soft rock mass is poor, it is easy to fall off when impacted by blasting, and the support operation is unsafe
Existing problems: small support range, unsafe support operation
Advantages and disadvantages: the support process is simple but the construction is difficult; the support range is small, not suitable for broken rock and soft rock, and the support operation is unsafe
Disadvantage: It is difficult to recover the ore pillar, which will eventually cause a large loss of ore

Method used

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  • Continuous and multilayer pre-support method of short downward anchor cable
  • Continuous and multilayer pre-support method of short downward anchor cable

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific examples.

[0025] 1. Preparatory work before support, such as figure 1 :

[0026] First of all, the mining joints are constructed: several parallel and spaced one-step mining joints and two-step mining joints are excavated perpendicular to the ore body direction, and both the first-step mining joints and the second-step mining joints reach the boundary of the ore body footwall. The distance between one-step mining and two-step mining is determined according to ore and rock conditions, mid-section planning and stope production capacity requirements.

[0027] Then carry out one-step mining and recovery operation: excavate along the one-step mining and mining joint into the one-step mining and cutting roadway of the ore body, and then excavate several one-step mining sub-sections 1 along the two sides of the one-step mining and cutting roadway parallel to the...

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PUM

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Abstract

The invention provides a continuous and multilayer pre-support method of a short downward anchor cable. In the method, by starting from a second layer, after one-step mining stripping backstopping, the pre-support operations are conducted as follows: firstly, drilling downwards inclining drill holes along slightly upper positions of two rib bottom plates of one-step mining stripping; mounting support deformed steel bars in the drill holes and pouring cement paste; utilizing the same one rooting deformed steel bar to connect tails of the support deformed steel bars at the same strip in the one-step mining strpping backstopping together; and performing cemented filling in a stope. Milltailings are filled after two-step mining backstopping. By using the method, look-head, continuous and multilayer supports are performed on an orebody to be mined, so that roof falling in the stope can be completely eliminated.

Description

[0001] technical field [0002] The invention relates to a roof support technology for underground mining stope pressure management of metal mines. Background technique [0003] At present, there are mainly the following methods for the roof support technology of underground metal deposit mining stope pressure management at home and abroad: [0004] The first method is roof pre-support before stope recovery. Use upward long anchor cables for pre-support. Supporting principle: The long anchor cable (rebar) is poured with cement slurry to form a whole with the ore rock. While strengthening the surrounding rock, it also plays a role in lifting and supporting the bottom ore rock. Supporting equipment and materials: YGZ90 guide rail rotary rock drill, single-cylinder grouting pump, screw steel, cement, accelerator, return air pipe, etc. Supporting process: rock drilling - installation of rebar, return air pipe - sealing - grouting - return air pipe overflow. Advantages: The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D21/00
Inventor 修国林杨竹周马云庆王瑞星王善飞
Owner SANSHANDAO GOLD MINE SHANDONG GOLD MINING LAIZHOU
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