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Poor-quality surrounding rock concrete wet-spraying method

A technology of surrounding rock and inferior quality, which is applied in the field of shotcrete surrounding rock of roadway and wet shotcrete of inferior surrounding rock, can solve the problems of poor supporting effect of dry shotcrete, and achieve good integrity and cohesion, stable performance, spraying fast effect

Active Publication Date: 2014-01-08
DATONG COAL MINE GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the support effect of dry sprayed concrete is poor for the surrounding rocks of underground roadways in coal mines, especially inferior surrounding rocks, the present invention provides a method for wet spraying concrete for inferior surrounding rocks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The wet shotcrete method for inferior surrounding rock comprises the following steps:

[0020] The gravel and sand are sieved with a special standard sieve for gravel and a special standard sieve for sand respectively, and then the cement, gravel and sand are mixed by a batching machine in a ratio of 1:1.5:3 by mass;

[0021] The prepared mixture is transported to the mixer by an explosion-proof transport vehicle;

[0022] Add water to the mixer at a mass ratio of 0.4:1 to cement, and stir to obtain concrete. Add water reducer and hydration agent to the concrete. The amount of water reducer added is 0.8% of the cement mass, and hydration agent The additive amount is 0.3% of the cement mass, the water reducer is RHEOPLUS 26 water reducer, and the hydration agent is Delvo hydration agent;

[0023] Use explosion-proof tanker to transport the concrete to the wet spraying machine installed in the underground;

[0024] At the nozzle of the wet spraying machine, the peristal...

Embodiment 2

[0026] The wet shotcrete method for inferior surrounding rock comprises the following steps:

[0027] The gravel and sand are sieved with a special standard sieve for gravel and a special standard sieve for sand respectively, and then the cement, gravel and sand are mixed by a batching machine in a mass ratio of 1:2:1.5;

[0028] The prepared mixture is transported to the mixer by an explosion-proof transport vehicle;

[0029] Add water to the mixer at a mass ratio of 0.5:1 to cement, and stir to obtain concrete. Add water reducer and hydration agent to the concrete. The amount of water reducer added is 1% of the cement mass, and hydration agent The additive amount is 1% of the cement mass, the water reducer is RHEOPLUS 26 water reducer, and the hydration agent is Delvo hydration agent;

[0030] Use explosion-proof tanker to transport the concrete to the wet spraying machine installed in the underground;

[0031]At the nozzle of the wet spraying machine, a peristaltic pump i...

Embodiment 3

[0033] The wet shotcrete method for inferior surrounding rock comprises the following steps:

[0034] The gravel and sand are sieved with a special standard sieve for gravel and a special standard sieve for sand respectively, and then the cement, gravel and sand are mixed by a batching machine in a ratio of 1:3:2 by mass;

[0035] The prepared mixture is transported to the mixer by an explosion-proof transport vehicle;

[0036] Add water to the mixer at a mass ratio of 0.43:1 to cement, and stir to obtain concrete. Add water reducer and hydration agent to the concrete. The amount of water reducer added is 0.85% of the cement mass, and hydration agent The additive amount is 1.5% of the cement mass, the water reducer is RHEOPLUS 26 water reducer, and the hydration agent is Delvo hydration agent;

[0037] Use explosion-proof tanker to transport the concrete to the wet spraying machine installed in the underground;

[0038] At the nozzle of the wet spraying machine, the peristal...

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Abstract

The invention relates to an underground coal mine supporting method, particularly relates to a roadway surrounding rock concrete wet-spraying method, and in particular relates to a poor-quality surrounding rock concrete wet-spraying method. The poor-quality surrounding rock concrete wet-spraying method comprises the following steps: respectively sieving stones and sand with a dedicated standard stone sieve and a dedicated standard sand sieve, then mixing cement, stones and sand through a batching machine according to the mass ratio of 1:(1.5-3):(1.5-3); conveying the batched mixed materials to an agitator; adding water in the agitator according to the water-cement ratio of (0.4-0.5):1, agitating to obtain concrete, adding a water reducing agent and a hydrated agent into the concrete, wherein the addition amount of the water reducing agent is 0.8%-1wt% of the cement, and the addition amount of the hydrated agent is 0.3%-2.0wt% of the cement; transporting the concrete to a wet spraying machine, arranged underground, through an anti-explosion tank car; adding an alkali-free liquid-state accelerator into the to-be-sprayed concrete at the spray nozzle of the wet spraying machine by a peristaltic pump through a regulating valve, wherein the addition amount of the alkali-free liquid-state accelerator is 1%-3wt% of the cement, and the concrete is sprayed out from the spray nozzle of the wet spraying machine. According to the poor-quality surrounding rock concrete wet-spraying method, the problem that the supporting effect of the surrounding rock, especially poor-quality surrounding rock is poor by adopting concrete dry spraying can be solved.

Description

technical field [0001] The invention relates to an underground supporting method of coal mines, in particular to a method for spraying concrete on roadway surrounding rocks, in particular to a method for wet spraying concrete on inferior surrounding rocks. Background technique [0002] With the significant increase in the intensity and scale of coal mine mining in my country, the section requirements of the roadway are getting larger and larger. The support problem of the large-section roadway has seriously affected the safe and efficient production of coal mines, which has attracted more and more people's attention. The research on cross-section roadway support is very important, especially in large-section coal roadways, the coal body is often unstable, the surrounding rock is easy to crack, and the support is difficult. When supporting large-section roadways in coal mines in China, sprayed concrete is generally used to enhance the stability of large-section coal roadways. ...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B14/06
Inventor 吴兴利杨智文成云海霍利杰宋银林刘大同李向峰王琦王利栋朱海月曹东升王冬波陈振国杨鑫春付茂全
Owner DATONG COAL MINE GRP
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