Thin spray sealing material and thin spray sealing method, open powder spraying equipment

Abstract

The invention provides a thin spray sealing material, which contains 15-55% of RD type polymer powder, 30-60% of inorganic filler, 14.5-40% of inorganic film-forming agent, and 0.5-5% of other auxiliary agents by weight percentage. %. The thin spray sealing material of the invention adopts RD type polymer powder as the main film-forming component, and can be sprayed to form a film by adding water, without by-products, VOCs and reaction heat, convenient and inexpensive to install, transport, store and use; Film-forming, ductility, permeability, environmental protection, flame retardancy, and can achieve sufficient strength, can replace shotcrete support in bolt-and-shot support technology. The invention also provides an open-type powder injection equipment with simple structure, low noise and no dust emission, which is suitable for the use of the thin-spraying sealing material of the invention, which includes a venturi gas-material mixing pipe, a blanking pipe, and a compressed air source. , the spray gun is communicated with the outlet of the venturi gas-material mixing pipe through the conveying pipe, and the spray gun is also provided with a spray nozzle which is communicated with the spray gun and is used for spraying atomized water into the spray gun.

Description

technical field [0001] The invention relates to a thin-spray sealing material, its thin-spray sealing method and open powder injection equipment, which is especially suitable for use in underground mine tunnels in coal mines. Background technique [0002] At present, domestic mines mainly adopt anchor shotcrete support as the main technical means of roadway support. Bolt-shotcrete support can effectively control the deformation of the roadway surrounding rock, ensure the stability of the roadway, and promote the technical reform of mine roadway support. Among them, shotcrete is an important content in the anchor shotcrete support technology system, and its function is to seal and reinforce the surrounding rock. [0003] However, after decades of practice tests, people have re-recognized the bearing capacity, scope of application and environmental safety of shotcrete: [0004] 1. The high concentration of dust can easily cause the operators to suffer from occupational disea...

AI Technical Summary

Problems solved by technology

[0004] 1. The high concentration of dust can easily make operators suffer from occupational diseases such as pneumoconiosis

[0005] 2. The shotcrete has high rebound rate and serious material waste

[0006] 3. The supporting capacity of the concrete sprayed layer is uncertain: it is difficult to inject into the cracks of the rock mass, and the effect of reducing the stress concentration of the concave and convex places of the surrounding rock is not obvious, etc.

[0007] 4. It is difficult for the concrete sprayed layer to deform together with the rock mass, and it is easy to break and fall off, forming a new safety hazard

[0008] 5. Regardless of the purpose of the sprayed concrete process is bearing, sealing, plugging, etc., due to its material characteristics, it needs to be sprayed thickly, which is easy to cause excessive support, making its spraying speed slow and employing many people, which is not conducive to reducing people and improving efficiency

However, after canceling the shotcrete process, it is bound to cause the surrounding rock of the roadway and the anchor net to be exposed, which will lead to the weathering of the surrounding rock, the corrosion of the anchor net and the spontaneous combustion of the coal seam.

[0010] At present, there are few similar technologies and achievements at home and abroad. The domestic literature is represented by "a mine support emulsion spraying material and support spraying construction method", which uses water glass and stone powder to make the base material and is matched with the curing agent. In use, it has the characteristics of no rebound, flame retardancy, fast solidification, high strength and low construction cost, but it needs on-site slurry mixing, complicated process, cumbersome cleaning, unclean working environment, low film adhesion and poor ductility.

Two-component reactive materials are basically used in foreign countries, which have the characteristics of strong adhesion, rapid curing, excellent mechanical properties, gap filling ability and excellent ductility, but they are prone to reaction heat and pungent odor, which is not conducive to underground construction in mines

Therefore, no matter it is the thin-sprayed material or the supporting process, the existing technology and achievements are difficult to meet the requirements of mines in my country.

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