Thin spraying material for inorganic coal mine and construction method of thin spraying material

Abstract

The invention provides an inorganic thin spraying material for a coal mine, and belongs to the technical field of spraying materials. The thin spraying material for the inorganic coal mine comprises the following components: 42.5-grade quick-hardening early-strength sulphoaluminate cement, 328-type redispersible latex powder, S95 mineral powder, glass fibers and the balance of 200-mesh quartz powder and quicklime powder. Mixing with water, stirring and pressurizing; the method has the advantages that the supporting thickness is small, and only 5 mm is needed; and in the construction process, the thickness of the thin spraying support is greatly reduced compared with that of the sprayed concrete support, so that the corresponding material preparation and transportation volume are greatly reduced. Under the same supporting condition, the weight of the thin spraying supporting material is only 7-10% of the weight of the sprayed concrete supporting material; on the other hand, thin spraying supporting equipment is small in size, light in weight and easy to transport; and the spraying operation speed is high, manpower resources are few, the construction period is short, and the material cost and the construction cost are both lower than those of a conventional supporting material.

Description

Technical Field

[0001] The invention belongs to the technical field of spraying materials, and in particular relates to an inorganic thin spraying material for coal mines. Background Art

[0002] Inorganic thin shotcrete materials for coal mines are inorganic materials that can be used for sealing, reinforcement, burst prevention, and weathering prevention of underground tunnels. They have the characteristics of gas mine sealing, heat insulation, weathering prevention, corrosion prevention, flame retardancy, and anti-static. They can effectively solve the shortcomings of existing shotcrete technology, such as slow construction speed, poor working environment, large material consumption, large auxiliary transportation volume, and many safety hazards. They are ideal materials for spraying underground tunnels in coal mines. The existing inorganic thin-sprayed materials for coal mines have the problems of long surface drying time, 50mm-150mm thickness of shotcrete support, high construction cost and poor bonding strength. Summary of the invention

[0003] The invention aims at solving the problems in the prior art and provides an inorganic thin spraying material for coal mines.

[0004] In order to achieve the above purpose, the technical solution adopted in this application is: The invention discloses an inorganic thin spraying material for coal mines, the components of which include fast-hardening and early-strengthening sulphoaluminate cement, redispersible latex powder, S95 mineral powder and glass fiber, and the balance is 200-mesh quartz powder and quicklime powder.

[0005] Preferably, the fast-hardening and early-strength sulphoaluminate cement is 42.5 grade fast-hardening and early-strength sulphoaluminate cement.

[0006] Preferably, the redispersible latex powder is 328 type redispersible latex powder.

[0007] Preferably, the S95 mineral powder includes at least one of 400 mesh mineral powder and 600 mesh mineral powder.

[0008] A construction method of inorganic thin spraying material for coal mines, the specific construction method is: Step 1: Mix inorganic coal mine thin-spraying materials and water in a water / material mass ratio of 0.35-0.45, set up a filter at the inlet of the mixing tank, pour in the prepared slurry, and the height of the slurry in the tank shall not exceed the maximum adding height of the mixing tank; Step 2: Use a coal drill with a stirring head to fully stir the water material for about 3-5 minutes until a uniform slurry without powder balls and agglomerates is formed; after mixing, place a rubber pad flat on the slurry and tighten the tank cover screws with a tool; Step 3: Close the pressure relief valve on the mixing tank, open the air inlet switch connected to the pressure pipe on the pressure gauge assembly to pressurize the tank; control the pressure in the tank to 0.4 MPa-0.6 MPa to obtain slurry; Step 4: Open the discharge valve at the bottom of the tank, then open the air pipe valve of the spray gun connected to the discharge valve, exhaust the air, and then open the spray gun material pipe valve until the slurry sprays out of the spray gun, then you can start construction; Step 5: After the construction is completed, immediately clean the spray equipment such as the spray gun and the inner wall of the mixing tank.

[0009] Compared with the prior art, the advantages and positive effects of the present invention are: The present invention relates to an inorganic thin spraying material for coal mines and a construction method thereof. The inorganic thin spraying material for coal mines comprises 42.5-grade fast-hardening and early-strength sulphoaluminate cement, 328-type redispersible latex powder, S95 mineral powder and glass fiber, with the remainder being 200-mesh quartz powder and quicklime powder; it is made by mixing with water, stirring and pressurizing; it has the advantage of thin support thickness, which only requires 5mm; and during construction, since the thickness of the thin spraying support is greatly reduced compared to the thickness of the shotcrete support, the corresponding material preparation and transportation volume are greatly reduced. Under the same support conditions, the weight of the thin spraying support material is only 7-10% of the weight of the shotcrete support material; on the other hand, the thin spraying support equipment is small in size, light in weight and easy to transport; and the spraying operation speed is fast, with less human resources and a short construction period, so that its material cost and construction cost are lower than those of conventional support materials; In addition, the inorganic thin spraying material for coal mines of the present application also has good adhesion: it can quickly and firmly bond coal, rocks, metal materials, plastics, etc.; strong airtightness: it can effectively isolate water and prevent gas overflow; the spray layer has good flexibility, high bending and shear strength; there is no dust and low rebound rate during spraying construction; the material is non-toxic and odorless pure powder, which is easy to construct, and has the advantages of flame retardant, anti-static, safe and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0011] Figure 1 This is a physical picture of the thin spray material of the present invention. DETAILED DESCRIPTION

[0012] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0013] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0014] Embodiment 1, as Figure 1 As shown, an inorganic thin spraying material for coal mines in the present application comprises 25% of 42.5-grade fast-hardening and early-strength sulphoaluminate cement, 20% of 328-type redispersible latex powder, 55% of S95 mineral powder, and the remainder is 200-mesh quartz powder and quicklime powder, wherein the ratio of 400-mesh mineral powder to 600-mesh mineral powder in the S95 mineral powder is 3:1.

[0015] The above-mentioned inorganic coal mine thin spraying material construction method is as follows: step 1: the inorganic coal mine thin spraying material is mixed with water according to the specific construction requirements and the water / material mass ratio is 0.4, a filter is set up at the feeding port of the mixing tank, and the prepared slurry is poured in. The height of the slurry in the tank does not exceed the maximum adding height of the mixing tank; the maximum adding height of the mixing tank is 20 cm below the feeding port; Step 2: Use a coal drill with a stirring head to fully stir the water material for about 3-5 minutes until a uniform slurry without powder balls and agglomerates is formed; after mixing, place a rubber pad flat on the slurry and tighten the tank cover screws with a tool; Step 3: Close the pressure relief valve on the mixing tank, open the air inlet switch connected to the pressure pipe on the pressure gauge assembly to pressurize the tank; control the pressure in the tank to 0.4 MPa-0.6 MPa to obtain slurry; Step 4: Open the discharge valve at the bottom of the tank, then open the air pipe valve of the spray gun connected to the discharge valve. After exhausting the air, open the spray gun material pipe valve until the slurry sprays out of the spray gun, then you can start construction.

[0016] Step 5: After the construction is completed, immediately clean the spraying equipment such as the spray gun and the inner wall of the mixing tank; avoid the slurry solidifying and clogging the mixing tank or the nozzle inside the spray gun, causing irreversible damage to the equipment, or contaminating the mixing tank.

[0017] Example 2, an inorganic thin spraying material for coal mines in the present application, its components include 25% of 42.5 grade fast-hardening and early-strength sulphoaluminate cement, 20% of 328 type redispersible latex powder, 55% of S95 mineral powder, and the remainder is 200 mesh quartz powder and quicklime powder, wherein the ratio of 400 mesh mineral powder to 600 mesh mineral powder in the S95 mineral powder is 1:0.

[0018] The above-mentioned inorganic coal mine thin spraying material construction method is as follows: step 1: the inorganic coal mine thin spraying material is mixed with water according to the specific construction requirements and the water / material mass ratio is 0.35, a filter is set up at the feeding port of the mixing tank, and the prepared slurry is poured in. The height of the slurry in the tank does not exceed the maximum adding height of the mixing tank; the maximum adding height of the mixing tank is 20 cm below the feeding port; Step 2: Use a coal drill with a stirring head to fully stir the water material for about 3-5 minutes until a uniform slurry without powder balls and agglomerates is formed; after mixing, place a rubber pad flat on the slurry and tighten the tank cover screws with a tool; Step 3: Close the pressure relief valve on the mixing tank, open the air inlet switch connected to the pressure pipe on the pressure gauge assembly to pressurize the tank; control the pressure in the tank to 0.4 MPa-0.6 MPa to obtain slurry; Step 4: Open the discharge valve at the bottom of the tank, then open the air pipe valve of the spray gun connected to the discharge valve. After exhausting the air, open the spray gun material pipe valve until the slurry sprays out of the spray gun, then you can start construction.

[0019] Step 5: After the construction is completed, immediately clean the spraying equipment such as the spray gun and the inner wall of the mixing tank; avoid the slurry solidifying and clogging the mixing tank or the nozzle inside the spray gun, causing irreversible damage to the equipment, or contaminating the mixing tank.

[0020] The elongation at break of the thin sprayed materials of Example 1 and Example 2 was tested, and the elongation at break of the thin sprayed material of Example 1 was measured to be 12.5% ​​at 1d, and the elongation at break at 28d remained above 12%; the elongation at break of the thin sprayed material of Example 2 at 28d remained above 11%, meeting the performance index of an elongation at break of more than 10%.

[0021] Example 3, an inorganic thin spraying material for coal mines in the present application, its components include 25% of 42.5 grade fast-hardening and early-strength sulphoaluminate cement, 20% of 328 type redispersible latex powder, 55% of S95 mineral powder, 0.2% of glass fiber, and the remainder is 200 mesh quartz powder and quicklime powder, wherein the ratio of 400 mesh mineral powder to 600 mesh mineral powder in the S95 mineral powder is 1:0.

[0022] The above-mentioned inorganic coal mine thin spraying material construction method is as follows: step 1: the inorganic coal mine thin spraying material is mixed with water according to the specific construction requirements and the water / material mass ratio is 0.35, a filter is set up at the feeding port of the mixing tank, and the prepared slurry is poured in. The height of the slurry in the tank does not exceed the maximum adding height of the mixing tank; the maximum adding height of the mixing tank is 20 cm below the feeding port; Step 2: Use a coal drill with a stirring head to fully stir the water material for about 3-5 minutes until a uniform slurry without powder balls and agglomerates is formed; after mixing, place a rubber pad flat on the slurry and tighten the tank cover screws with a tool; Step 3: Close the pressure relief valve on the mixing tank, open the air inlet switch connected to the pressure pipe on the pressure gauge assembly to pressurize the tank; control the pressure in the tank to 0.4 MPa-0.6 MPa to obtain slurry; Step 4: Open the discharge valve at the bottom of the tank, then open the air pipe valve of the spray gun connected to the discharge valve. After exhausting the air, open the spray gun material pipe valve until the slurry sprays out of the spray gun, then you can start construction.

[0023] Step 5: After the construction is completed, immediately clean the spraying equipment such as the spray gun and the inner wall of the mixing tank; avoid the slurry solidifying and clogging the mixing tank or the nozzle inside the spray gun, causing irreversible damage to the equipment, or contaminating the mixing tank.

[0024] Example 4, an inorganic thin spraying material for coal mines in the present application, its components include 25% of 42.5 grade fast-hardening and early-strength sulphoaluminate cement, 20% of 328 type redispersible latex powder, 55% of S95 mineral powder, 0.1% of glass fiber, and the remainder is 200 mesh quartz powder and quicklime powder, wherein the ratio of 400 mesh mineral powder to 600 mesh mineral powder in the S95 mineral powder is 1:0.

[0025] The above-mentioned inorganic coal mine thin spraying material construction method is as follows: step 1: the inorganic coal mine thin spraying material is mixed with water according to the specific construction requirements and the water / material mass ratio is 0.35, a filter is set up at the feeding port of the mixing tank, and the prepared slurry is poured in. The height of the slurry in the tank does not exceed the maximum adding height of the mixing tank; the maximum adding height of the mixing tank is 20 cm below the feeding port; Step 2: Use a coal drill with a stirring head to fully stir the water material for about 3-5 minutes until a uniform slurry without powder balls and agglomerates is formed; after mixing, place a rubber pad flat on the slurry and tighten the tank cover screws with a tool; Step 3: Close the pressure relief valve on the mixing tank, open the air inlet switch connected to the pressure pipe on the pressure gauge assembly to pressurize the tank; control the pressure in the tank to 0.4 MPa-0.6 MPa to obtain slurry; Step 4: Open the discharge valve at the bottom of the tank, then open the air pipe valve of the spray gun connected to the discharge valve. After exhausting the air, open the spray gun material pipe valve until the slurry sprays out of the spray gun, then you can start construction.

[0026] Step 5: After the construction is completed, immediately clean the spraying equipment such as the spray gun and the inner wall of the mixing tank; avoid the slurry solidifying and clogging the mixing tank or the nozzle inside the spray gun, causing irreversible damage to the equipment, or contaminating the mixing tank.

[0028] The thin-film spraying material of Example 3 and the traditional concrete spraying material were subjected to comparative mechanical property testing and cost comparison calculation, and the results are shown in Table 1 and Table 2; Table 1 Comparison of mechanical properties of thin-film spraying materials and traditional concrete spraying materials Table 2 Comparison of the cost of thin-film spraying materials and traditional concrete spraying materials

[0029] According to calculation, each ton of thin spray material can spray an area of ​​300m 2 About 300m per spray 2 The total area can save about 60,000 yuan, and the cost per square meter can be saved by 211.25 yuan.

[0030] The dynamic viscosity and 1d mechanical properties of the thin sprayed materials of Example 3 and Example 4 were tested, and the 1d compressive strength of the thin sprayed material of Example 3 with a glass fiber content of 0.2% was measured to be 2.83 MPa, and the 1d compressive strength of the thin sprayed material of Example 4 with a glass fiber content of 0.1% was measured to be 2.91 MPa. The 1d compressive strength of the thin sprayed material of Example 3 is reduced by about 6% relative to that of the thin sprayed material of Example 4, but the dynamic viscosity of the thin sprayed material of Example 3 is 4395 mPa.s, corresponding to the fluidity of the material.

[0031] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. An inorganic thin spraying material for coal mines, characterized in that: The components include fast-hardening and early-strength sulphoaluminate cement, redispersible latex powder, S95 mineral powder and glass fiber, and the balance is 200-mesh quartz powder and quicklime powder.

2. The inorganic thin-spray material for coal mine according to claim 1, characterized in that: The fast-hardening and early-strength sulphoaluminate cement is 42.5 grade fast-hardening and early-strength sulphoaluminate cement.

3. The inorganic thin spraying material for coal mine according to claim 1, characterized in that: The redispersible latex powder is 328 type redispersible latex powder.

4. The inorganic thin spraying material for coal mine according to claim 1, characterized in that: The S95 mineral powder includes at least one of 400 mesh mineral powder and 600 mesh mineral powder.

5. A construction method for inorganic thin spraying material for coal mine according to any one of claims 1 to 4, characterized in that: The specific construction method is: Step 1: Mix inorganic coal mine thin-spraying materials and water in a water / material mass ratio of 0.35-0.45, set up a filter at the inlet of the mixing tank, pour in the prepared slurry, and the height of the slurry in the tank shall not exceed the maximum adding height of the mixing tank; Step 2: Use a coal drill with a stirring head to fully stir the water material for about 3-5 minutes until a uniform slurry without powder balls and agglomerates is formed; after mixing, place a rubber pad flat on the slurry and tighten the tank cover screws with a tool; Step 3: Close the pressure relief valve on the mixing tank, open the air inlet switch connected to the pressure pipe on the pressure gauge assembly to pressurize the tank; control the pressure in the tank to 0.4 MPa-0.6 MPa to obtain slurry; Step 4: Open the discharge valve at the bottom of the tank, then open the air pipe valve of the spray gun connected to the discharge valve, exhaust the air, and then open the spray gun material pipe valve until the slurry sprays out of the spray gun, then you can start construction; Step 5: After the construction is completed, immediately clean the spray equipment such as the spray gun and the inner wall of the mixing tank.

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