Dry mixing gunite material in use for underworkings of coal mine, and preparation method

Abstract

The invention relates to a dry-mixed slurry spraying material used in coal mine laneway. It includes concrete, quartz sand or crushed sand, CaCO3, cellulose, and fiber. The feature is that concrete contains 100 portions, quartz sand or crushed sand contains 150-300portions, calcium carbonate is 0-50 portions, HPMC is 0.2-0.3 portions, polymer emulsion is 10-30 portions, polypropylene fiber is 0.1-0.2 portions, zinc fluosilicate is 5-10 portions, water reducing agent is 0.5-0.7 portions, and early strength agent is 0.2-0.3 portions. The method includes the following steps: weighing the raw material accurately, whisking in high efficiency blender for 20 minutes, mixing to equal and packaging. The invention has the advantages of light, high intension, high binding glue, inflaming, water proof, simple manufacturing technology, etc.

Description

technical field [0001] A dry-mixed shotcrete material for coal mine underground roadway and a preparation method thereof, the invention relates to the technical field of a coal mine underground roadway construction shotcrete material and the preparation of the material. Background technique [0002] China's economic development in the past 30 years has achieved world-renowned achievements, but at the same time, the rapidly developing economy has an increasing demand for energy. At present, domestic oil cannot meet the needs of economic development, and it is a strategic state policy of our country to increase the development of domestic abundant coal resources. [0003] For a long time, in the process of mining coal resources, the proportion of investment in safety production facilities and improvement of workers' working environment has been very small. Among them, the underground dust pollution is serious, and the underground dust mainly comes from the coal dust at the mi...

AI Technical Summary

Problems solved by technology

[0007] 1. In the underground mining site, the dry mixing of cement sand and gravel, cement sand and gravel and other dust pollution is large, which is harmful to the workers on site and seriously pollutes the underground environment;

[0008] 2. On-site mixing, the noise generated by the mixer is large, which is harmful to the hearing of the operator;

[0009] 3. On-site mixing, it is not easy for operators to strictly control the proportion of cement, sand and gravel, etc., and the quality control of shotcrete materials is not strict, which may easily cause hidden dangers of quality accidents; It is easy to produce ground material, causing a lot of waste, and the general rebound of the ground material is more than 30%. The performance of the sprayed material is single, and it is impossible to make the sprayed material have high adhesion, waterproof, anti-cracking, reinforcement and support;

[0010] 4. On-site mixing needs to occupy valuable underground roadway places, such as stacking cement, sand and gravel, etc., which will affect the roadway section and transportation gap, affect the construction speed of the main coal mining industry, and easily block the roadway and cause accident hazards;

[0011] 5. The thickness of the sprayed grout is required to be thick, generally 10-20 cm thick. When sprayed, the adhesion is poor, the rebound is large, and the ground material is large, resulting in serious waste of sprayed grouting materials. At the same time, the mortar coagulates slowly and the supporting effect is slow.

[0012] 6. After the shotcrete material is solidified, due to the single ingredients, most of the components are rigid, the material is rigid and brittle, and the flexibility is insufficient. With the geological movement of the underground roadway or the vibration of blasting in the re-mining, it is very easy to cause the traditional shotcrete material cracking and falling off, which may cause further hidden dangers such as water leakage, gas overflow, and support mortar collapse, and cannot really play its due protective role.

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