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Hard coal anti-scouring pressure-relief boring construction method and equipment

A technology of construction equipment and construction methods, which is applied in earth-moving drilling, drilling with liquid/gas jet, surface mining, etc. The cost of pressure relief, the effect of ensuring anti-scour effect, and the effect of broad market promotion value

Active Publication Date: 2017-08-08
NORTH CHINA INST OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The "break first and then break" drilling technology changes the mechanical drilling mode, retains the mechanical crushing characteristics, improves the drilling efficiency, and integrates the hydraulic anti-scour characteristics, so as to effectively solve the inefficient drilling of coal seam anti-scour drilling , sticking drill rods, powder accumulation and dust accumulation, etc.

Method used

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  • Hard coal anti-scouring pressure-relief boring construction method and equipment
  • Hard coal anti-scouring pressure-relief boring construction method and equipment
  • Hard coal anti-scouring pressure-relief boring construction method and equipment

Examples

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Embodiment 1

[0050] As a typical deep mine (mining depth exceeding 1000m), Yuncheng Coal Mine in Shandong Province is seriously threatened by rock burst disasters. In the past two years, there have been 6 occurrences of rock bursts in the Yuncheng mine field, causing damage to hundreds of meters of roadways, causing large economic losses to mining companies, and also seriously threatening the lives of underground personnel.

[0051] The mineable coal seam of Yuncheng Coal Mine is 3 coal seams, with an average thickness of 6.3m and a unidirectional compressive strength of 15MPa. During the process of roadway excavation and working face mining, it is threatened by rock burst. The Yuncheng Coal Mine used to use column-type pressure relief drilling rigs for construction. Three people worked as a shift. Under normal conditions where the drill did not get stuck, one shift constructed 3 pressure relief drilling holes, ie 75m.

[0052] The method of the present invention is used to implement large...

Embodiment 2

[0068] A kind of hard coal anti-scouring and pressure-relieving drilling construction method adopts the coal seam anti-scouring drilling technology of mechanical drilling and hydraulic jet drilling, and the steps are:

[0069] (1) First use high-pressure water to wash down the coal body and form a drilling section; the pressure of the high-pressure water flow is greater than the compressive strength of the coal body and is not greater than 30MPa. The drilling diameter after punching is 100-150mm.

[0070] (2) Reuse the drilling rig to break the washed down coal body;

[0071] (3) Then use the water flow to wash out the coal powder.

[0072] The hard coal refers to the Platts coefficient f>2.

[0073] A kind of hard coal anti-scouring and pressure-relief drilling construction method of the present invention adopts the coal seam anti-scouring drilling technology of mechanical drilling and hydraulic jet drilling, first uses high-pressure water to wash down the coal body and for...

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Abstract

The invention discloses a hard coal anti-scouring pressure-relief boring construction method and equipment. A coal bed anti-scouring boring drilling technology integrating mechanical drilling and hydraulic jetting drilling is adopted. Firstly, high-pressure water is jetted to wash down coal mass, a drilling fracture surface is formed, then the coal mass washed down is crushed through a drill bit, and the high-pressure water flows back and carries out pulverized coal, so that the three-level boring drilling technology that rock is washed down hydraulically, crushed mechanically and carried out through backflow is achieved, and the effects of drilling, pore forming, dust settling, pulverized coal discharging and cooling are achieved. Through the crushing-after-washing drilling technology, the mechanical drilling mode is changed, characters of mechanical crushing are preserved, the boring drilling efficiency is improved, the hydraulic anti-scouring character is combined, and accordingly, the problems of low-efficiency drilling, getting stuck and stem loss, dust accumulation and the like of coal bed anti-scouring boring are effectively solved.

Description

technical field [0001] The invention relates to the technical field of prevention and control of rock burst in coal mines, in particular to a hard coal anti-scouring and pressure-relieving drilling construction method and equipment. Background technique [0002] Rock burst is one of the most serious dynamic disasters faced by coal mines in my country. With the gradual reduction of shallow coal resource reserves, the mining depth continues to increase. According to statistics, coal resource reserves with a depth of more than 1,000 meters account for 53% of the total coal resources in my country. The maximum mining depth is close to 1,500 meters; easy-to-mine coal resources are gradually exhausted, and the proportion of complex and difficult-to-mine coal production is increasing. With the increase of coal mining intensity and the deterioration of coal mining conditions, rock burst disasters are becoming more and more serious. At present, there are more than 160 rock burst mine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/18E21B7/18
CPCE21B7/18E21C41/18
Inventor 刘金海田昭军高林生程建平王永朱权洁曲乐明王维斌居昌波李恒章
Owner NORTH CHINA INST OF SCI & TECH
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