CN102877863A - Wet-type injecting and reinforcing method of coal mine underworkings - Google Patents

Wet-type injecting and reinforcing method of coal mine underworkings Download PDF

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Publication number
CN102877863A
CN102877863A CN2012104007570A CN201210400757A CN102877863A CN 102877863 A CN102877863 A CN 102877863A CN 2012104007570 A CN2012104007570 A CN 2012104007570A CN 201210400757 A CN201210400757 A CN 201210400757A CN 102877863 A CN102877863 A CN 102877863A
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China
Prior art keywords
concrete
water
sand
coal mine
cement
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Pending
Application number
CN2012104007570A
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Chinese (zh)
Inventor
许志强
刘秋平
李松虎
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ZHENGZHOU ZHENGTONG MINING EQUIPMENT MANUFACTURING Co Ltd
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ZHENGZHOU ZHENGTONG MINING EQUIPMENT MANUFACTURING Co Ltd
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Priority to CN2012104007570A priority Critical patent/CN102877863A/en
Publication of CN102877863A publication Critical patent/CN102877863A/en
Pending legal-status Critical Current

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Abstract

The invention relates to a wet-type injecting and reinforcing method of coal mine underworkings, by which dust pollution in the coal mine underworkings can be prevented effectively so as to reduce occupational silicosis. The technical scheme for the solution is: raw material selection, wherein raw materials comprise sand, stones, cement, a dry powder accelerator calcium sulfate and water; and slurry preparation: firstly filling the sand and the stones into a spiral blending machine, adding water for the first time to blend and wet the sand and the stones; adding cement, then adding water for the second time and blending, thus the mixed materials form uniform concrete slurry; adding the dry powder accelerator calcium sulfate into the concrete slurry so as to form concrete injecting slurry; filling the concrete spraying slurry into a rotor-type concrete injector, adding water for the third time for an injecting head, and injecting the concrete injecting slurry on the top surface and the side surface of the coal mine underworkings in a wet mode. The method provided by the invention is simple; the injecting effect is good; the efficiency is high; the coal mine underworkings are solid and durable; the dust pollution in the workings is reduced; the occupational silicosis caused by dust is effectively prevented; and the economic and social benefits are great.

Description

A kind of coal mine down-hole tunnel wet shotcrete technology reinforcement means
Technical field
The present invention relates to safety of coal mines protection, particularly a kind of coal mine down-hole tunnel wet shotcrete technology reinforcement means.
Background technology
Coal mining worldwide extensively has it, particularly China is the important locality of coal, also be the main energy, and coal mining is to carry out underground, set up the mine that coal mining is used, because Mine Dust is many, environment is poor, and is very big on miner's healthy impact, and anthraco-silicosis is exactly common occupational disease, in order to prevent suffering from anthraco-silicosis because coal dust causes the miner, therefore need to carry out the shotcrete consolidation process to coal mine down-hole tunnel, to reduce dust, because the space is little under the mine, there is not agitator, spraying machine can not be realized wet shot or tide spray, at present shotcrete is carried out in the colliery tunnel and reinforces, and is mostly to adopt spraying machine that wall is carried out dry-type jetting, this dry-type jetting can only be applicable to ground, and can't effectively be applicable under the mine, therefore, environment pollution, the problem of suffering from anthraco-silicosis can't solve, so how effectively solve environment pollution, prevent from suffering from the problem of anthraco-silicosis? this is the technical problem that need to conscientiously solve.
Summary of the invention
For above-mentioned situation, for overcoming the defective of prior art, the present invention's purpose just provides a kind of coal mine down-hole tunnel wet shotcrete technology reinforcement means, can effectively prevent the pollution of dust in the tunnel under the colliery, suffers from the industrial pneumoconiosis problem to reduce.
The technical scheme that the present invention solves is may further comprise the steps:
1, choose raw material: raw material comprises sand, stone, cement, dry powder accelerating admixture calcium sulfate and water;
2, slurrying: sand, stone are packed into first in the screw mixer, add water for the first time and sand, stone are stirred drench, after adding cement, carry out adding second time the water stirring, make compound become uniform concrete grout;
3, in concrete grout, add dry powder accelerating admixture calcium sulfate, become concrete spraying;
4, concrete spraying is packed in the rotor-type concrete sprayer, shower nozzle is added water for the third time, with wet type concrete spraying is ejected on coal mine down-hole tunnel end face and the sidewall;
The inventive method is simple, and jeting effect is good, and efficient is high, and is sturdy and durable, has greatly reduced the pollution of dust in the tunnel, effectively prevents the industrial pneumoconiosis that causes because of dust pollution, and economic and social benefit is huge.
The specific embodiment
The present invention is realized by following steps in implementation:
1, choose raw material: raw material comprises sand, stone, cement, dry powder accelerating admixture calcium sulfate and water, wherein, in weight ratio Sha ︰ Shi ︰ cement=2 ︰, 2 ︰ 1, adding water 40m3(in the compound of every 100m3 by sand, stone, cement composition is that water/binder ratio is 40%), dry powder accelerating admixture calcium sulfate addition is 5m3;
2, slurrying: by above-mentioned steps 1 charge ratio, sand, stone are packed into first in the screw mixer, adding for the first time water drenches sand, stone stirring, add again cement, stirring makes sand, stone and cement-bonded, then adds for the second time water and stirs, and makes compound become uniform concrete grout, in concrete grout, add dry powder accelerating admixture calcium sulfate, become concrete spraying;
3, concrete spraying is packed in the rotor-type concrete sprayer, shower nozzle by rotor-type concrete sprayer sprays reinforcing to coal mine down-hole tunnel end face and sidewall, when spraying, shower nozzle is added water for the third time, with wet type concrete spraying is ejected on coal mine down-hole tunnel end face and the sidewall, to guarantee jeting effect;
In described step 2 slurrying, add water for the first time and make water/binder ratio reach 15%, add water for the second time and make water/binder ratio reach 25%, add for the third time water in the step 3 and make water/binder ratio reach 40%;
Described sand is the middle sand of particle diameter 0.35-0.5mm for building, and stone is the following stone of particle diameter 40mm for building, and cement is portland cement for building.
The inventive method is simple, is easy to construction, and is effective, compared with prior art, has following outstanding useful technique effect:
1, the present invention makes concrete spraying by screw mixer, with wet type coal mine roadway is sprayed reinforcing with rotor-type concrete sprayer again, and efficient is high, and is effective, firm, greatly reduced the pollution of dust to the tunnel; This wet type reinforcement means is unprecedented, has realized that shotcrete reinforcing in tunnel can only be adopted dried spray under the colliery, can't effectively prevent the problem of anthraco-silicosis;
2, the dry powder accelerating admixture adopts calcium sulfate among the present invention, more stable than the calcium carbonate that dry method is used, moisture evaporation after the calcium sulfate heating, can dewater rapidly after meeting water, so calcium sulfate is typically used as dehydrating agent, desiccant, the calcium sulfate chemical composition is highly stable, adds meeting accelerate concrete setting time in the concrete, strengthens concrete strength.Calcium sulfate itself is without corrosion, and odorlessness without harm, is conducive to prevent the tunnel environment pollution to human body, effectively reduces the probability of suffering from anthraco-silicosis;
3, existing wet sprayer NaoH liquid accelerator, NaOH belongs to the dangerous material of deep-etching strong stimulation smell, and is too large to workman's harm, NaOH and Carbon Dioxide in Air just generate sodium acid carbonate, and the sodium acid carbonate water breakthrough is dissolving just, flows out with water, concrete is formed cellular, reduce concrete strength, even therefore the Beijing West Railway Station infiltration reprocesses, the Harbin bridge collapses and also is so reason, the NaOH deep-etching, the strong stimulation smell, large especially to workman's harm, be not suitable for underground work.The concrete shelf-life of dry powder accelerating admixture of the present invention is 100 years, 3 years concrete shelf-lifves of liquid accelerator.Reduce side spray resilience 5 percent, top spray resilience ten Percent through stirring the concrete springback that sprays.Do not pass through the concrete of mixer, side spray resilience 50 percent, top spray resilience 60 percent.And the present invention adopts calcium sulfate, effectively overcomes defects, and the Eradication anthraco-silicosis is stopped secondary pollution, is that the applicant is pioneering;
4, the present invention adopts three times (or claiming three grades) to add the water mode, the world is pioneering, overcome that once to add the water current too large, cement is washed away, stir inhomogeneous, three times (or claiming three grades) add water: add water with sand for the first time, stone drenches, the sand that drenches, stone is run into rapidly cement, and cement parcel sandstone run into and add water for the second time, be stir more even, the generation effect is to brew cement, add for the third time water and thoroughly eliminate dust at shower nozzle, elimination anthraco-silicosis, its effect good, do not expect, in the actual use through the down-hole, and adopt other method that the borehole wall is reinforced to compare, subsurface environment has obtained improvement fundamentally, the anthraco-silicosis morbidity rate reduces more than 99%, and economic and social benefit is huge.

Claims (3)

1. a coal mine down-hole tunnel wet shotcrete technology reinforcement means is characterized in that, may further comprise the steps:
(1), choose raw material: raw material comprises sand, stone, cement, dry powder accelerating admixture calcium sulfate and water, wherein, in weight ratio Sha ︰ Shi ︰ cement=2 ︰, 2 ︰ 1, add water 40m3 in the compound of every 100m3 by sand, stone, cement composition, dry powder accelerating admixture calcium sulfate addition is 5m3;
(2), concrete spraying processed: by above-mentioned steps (1) charge ratio, sand, stone are packed into first in the screw mixer, adding for the first time water drenches sand, stone stirring, add again cement, stirring makes sand, stone and cement-bonded, then adds for the second time water and stirs, and makes compound become uniform concrete grout, in concrete grout, add dry powder accelerating admixture calcium sulfate, become concrete spraying;
(3), concrete spraying is packed in the rotor-type concrete sprayer, shower nozzle by rotor-type concrete sprayer sprays reinforcing to coal mine down-hole tunnel end face and sidewall, when spraying, shower nozzle is added water for the third time, with wet type concrete spraying is ejected on coal mine down-hole tunnel end face and the sidewall.
2. coal mine down-hole tunnel wet shotcrete technology reinforcement means according to claim 1, it is characterized in that, for the first time add water in described step (2) slurrying and make water/binder ratio reach 15%, add water for the second time and make water/binder ratio reach 25%, add for the third time water in the step (3) and make water/binder ratio reach 40%.
3. coal mine down-hole tunnel wet shotcrete technology reinforcement means according to claim 1 is characterized in that, described sand is the middle sand of particle diameter 0.35-0.5mm for building, and stone is the following stone of particle diameter 40mm for building, and cement is portland cement for building.
CN2012104007570A 2012-10-19 2012-10-19 Wet-type injecting and reinforcing method of coal mine underworkings Pending CN102877863A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109236329A (en) * 2018-11-13 2019-01-18 湖南黄金洞矿业有限责任公司 A kind of underground tailings wet shotcrete method for protecting support
CN110359927A (en) * 2019-07-16 2019-10-22 黑龙江天辉生物科技有限公司 The compound gunite material of underground mine use and its application method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101535208A (en) * 2006-11-09 2009-09-16 电气化学工业株式会社 Set accelerator and technique for spraying with the same
CN102733823A (en) * 2012-07-03 2012-10-17 河南省煤炭科学研究院有限公司 Mining method for jetting concrete in wet type

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101535208A (en) * 2006-11-09 2009-09-16 电气化学工业株式会社 Set accelerator and technique for spraying with the same
CN102733823A (en) * 2012-07-03 2012-10-17 河南省煤炭科学研究院有限公司 Mining method for jetting concrete in wet type

Non-Patent Citations (3)

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唐文哲: "潮喷法喷射混凝土在大广坝水电站地下洞室中的应用", 《广西电力工程》, no. 3, 15 August 1996 (1996-08-15) *
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109236329A (en) * 2018-11-13 2019-01-18 湖南黄金洞矿业有限责任公司 A kind of underground tailings wet shotcrete method for protecting support
CN110359927A (en) * 2019-07-16 2019-10-22 黑龙江天辉生物科技有限公司 The compound gunite material of underground mine use and its application method
CN110359927B (en) * 2019-07-16 2021-10-29 双鸭山德盟机电科技开发有限公司 Composite guniting material for underground coal mine and use method thereof

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Application publication date: 20130116