Coal pillar reinforcement method for waste resource utilization

Abstract

The application discloses a coal column reinforcing method for waste resource utilization, which is characterized by the following steps: ensuring the stability of the coal column, designing a groove on the coal column, pasting a groove mold on the coal column, embedding the groove mold, filling the groove mold with coal gangue concrete, and prefabricating the groove mold. The application can ensure the stability of the coal column, design a groove on the coal column, prefabricate a groove mold, paste the groove mold on the coal column, embed the groove mold, fill the groove mold with coal gangue concrete, and make the construction operation simple. The application can effectively reduce the size of the coal column, improve the coal resource mining rate, avoid the waste of coal resources, and realize the resource utilization of the waste coal gangue.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underground mining engineering reinforcement, and particularly relates to a coal pillar reinforcement method for waste resource utilization. BACKGROUND

[0002] In the process of coal mining, in order to ensure safety, a part of coal is left in the mining face during mining, which is a coal pillar. The coal pillar is an important standard for measuring the mining rate of a mining area and an important index for coal production safety. In order to improve the resource recovery rate, the coal pillar is usually reinforced to strengthen the lateral constraint of the coal pillar, so as to improve the strength of the coal pillar and reduce the size of the coal pillar. Common coal pillar reinforcement methods include wood pin and anchor rod reinforcement, grouting reinforcement, gangue, wood pile reinforcement, and high water material wall reinforcement.

[0003] Coal gangue is a waste residue generated in the process of coal production. The accumulation of coal gangue not only occupies a large amount of land, but also pollutes the atmosphere and water sources after the emission of sulfides contained in the coal gangue, causing serious consequences. Therefore, solving the problem of coal gangue treatment and utilization is also an important task of the coal mining and environmental protection departments.

[0004] FRP fiber cloth is a high-performance composite material formed by mixing fiber materials and resin in a certain proportion. FRP fiber cloth has the characteristics of high tensile strength, corrosion resistance, light weight, high hardness, and fatigue resistance, and is widely used in the field of building reinforcement.

[0005] HDPE pipe is a pipe made of high-density polyethylene. HDPE pipe has the characteristics of long service life, light weight, green environmental protection, etc. HDPE pipe is light and tough, easy to carry, labor-saving, and quick to install, and is a high-efficiency pipe. HDPE pipe can achieve ideal construction efficiency and economic effect.

[0006] Silicon-aluminum fiber blanket is formed by special double-needle punching process of special silicon-aluminum ceramic fiber filament. The silicon-aluminum fiber blanket has the properties of fire resistance, heat resistance, and thermal insulation, and also has the properties of shock resistance and excellent tensile strength, and is an excellent refractory material.

[0007] Among them according to patent application publication no. CN113818879A discloses a kind of broken coal column reinforcement and fire prevention method, broken coal column reinforcement and fire prevention method includes: the damage analysis of broken coal column is carried out, determines the damage region and damage distribution characteristics of broken coal column;Based on the damage region and damage distribution characteristics determined, the reinforcement, fire prevention material of broken coal column is determined;Based on the reinforcement, fire prevention material determined, material proportioning analysis and determination are carried out, and the reinforcement, fire prevention material combination of optimal proportion is obtained;Based on the reinforcement, fire prevention material combination of optimal proportion determined, the preparation of anti-blocking material is carried out;The performance detection of prepared anti-blocking material is carried out;Based on the damage region and damage distribution characteristics of broken coal column determined, the reinforcement of broken coal column is carried out using the anti-blocking material by performance detection.The construction is carried out using the sealing material of the application, the effect of reinforcement can be improved, and the fireproof performance of coal column is guaranteed.

[0008] Among them, the prior art design is complex when reinforcing coal column, and a large amount of coal gangue in coal mine is not convenient for resource utilization. SUMMARY

[0009] The purpose of the application is to provide a coal column reinforcement method for waste resource utilization, to solve the problems of durability, load-bearing capacity, corrosion resistance and construction inconvenience of coal column, and the environmental pollution caused by coal gangue and how to handle and utilize coal gangue, to further improve the mining rate of coal and avoid the problem of waste of coal resources.

[0010] To solve the above technical problems, the application adopts the following technical scheme:

[0011] The application provides a coal column reinforcement method for waste resource utilization, comprising the following steps:

[0012] Step one: under the condition of ensuring that the stability of the coal column is not affected, groove design is carried out on the coal column.

[0013] Step two: prefabricate a grooved mold, the grooved mold is spliced and arranged outside the coal column in step one, wherein after the grooved mold is attached to the coal column and embedded, the grooved mold is filled with coal gangue concrete.

[0014] Further, it further comprises step three: selecting FRP fiber cloth, uniformly applying a layer of adhesive on the inner surface of the FRP fiber cloth, wrapping the FRP fiber cloth along the outer surface of the HDPE pipe mold, and uniformly applying a layer of adhesive on the outer surface of the FRP fiber cloth.

[0015] Or / and, it further comprises step four: laying a layer of fireproof material, using aluminum silicate fiber blanket as the fireproof material, and wrapping the aluminum silicate fiber blanket on the outer surface of the FRP fiber cloth.

[0016] Further, in step one, when there are cracks on the outer surface of the coal pillar, the cracks are filled and repaired with water glass or epoxy resin glue, and then the grooving design on the coal pillar is continued.

[0017] Further, in step two, the adjacent said slotted molds are connected through mortise and tenon structure; and the coal gangue concrete is a concrete in which 40%-45% of coal gangue replaces coarse aggregate;

[0018] Or / and, the slotted mold is prefabricated through the HDPE pipe; wherein the connection mode between the adjacent said modules is that the two ends of the pipe wall connection of the HDPE pipe are prefabricated into connection structure one, connection structure two, and connection structure three;

[0019] Wherein the connection structure one is outside the pipe wall connection of one end of the module, the connection structure two is between the inside of the pipe wall connection of the other end, and a hole groove is opened on the outer surface of the pipe wall of the connection structure two, the position of the hole groove is opposite to the groove of the connection structure two, and the size of the hole groove is consistent with the size of the connection structure, the modules of each HDPE pipe are the same, and the slotted mold is embedded along the coal pillar groove, and the coal gangue concrete is filled in the slotted mold.

[0020] Or / and, the slotted mold can be prefabricated into a mold that can be spliced up and down according to the height of the coal pillar.

[0021] Further, in step three, the material of the FRP fiber cloth is selected from any one of carbon fiber reinforced composite material, glass fiber reinforced composite material, aramid fiber reinforced composite material, and basalt fiber reinforced composite material.

[0022] Further, in step four, the fireproof material in the fireproof layer is selected from aluminum silicate fiber blanket.

[0023] Further, in steps two and three, the thickness of the pipe wall of the HDPE pipe is T mm, the number of layers of the FRP fiber cloth is N, the height of the coal pillar is H meters, and if the cross-sectional shape of the coal pillar is circular, the diameter of the coal pillar is D meters, then the following four cases are discussed:

[0024] (1) When H≤3, D≤8, T=5, N=3;

[0025] (2) When 3

[0026] (3) When 5

[0027] (4) When H>7, D>25, T=20, N=9.

[0028] If the cross-sectional shape of the coal pillar is polygonal, the formula to judge the winding layer number of FRP fiber cloth, wherein n is the number of edges of the polygon, and n is a positive integer greater than or equal to 4, and D is the equivalent diameter of the coal pillar, is the length of the edge of the polygon.

[0029] Further, in step three, the last lap length of the FRP fiber cloth in the winding process is Δ, if the coal pillar section shape is circular, then If the coal pillar section shape is a polygon, then , wherein b max is the longest edge of the polygon.

[0030] Compared with the prior art, the beneficial technical effects of the present application are:

[0031] The present application ensures that the coal pillar stability is not affected, and the grooving design is performed on the coal pillar; then a prefabricated grooved mold is arranged outside the coal pillar in step one, wherein the grooved mold is attached to the coal pillar and embedded, and the coal gangue concrete is filled in the grooved mold; so that the construction operation is simple; the coal pillar size can be effectively reduced, the coal resource mining rate is improved, and the waste of coal resources is avoided;

[0032] In addition, in the present application, the coal gangue is used to make the coal gangue concrete, so as to realize local material taking, resource utilization of waste coal gangue, so as to avoid pollution to the ecological environment, and reduce the waste of human and material resources of the coal gangue; BRIEF DESCRIPTION OF DRAWINGS

[0033] The present application will be further described below in combination with the description of the drawings.

[0034] Figure 1 is the operation flow diagram of the coal pillar reinforcing method of waste resource utilization of the present application;

[0035] Figure 2 is the schematic diagram of the coal pillar reinforcing method of waste resource utilization of the present application;

[0036] Figure 3 is the HDPE pipe mold schematic diagram in the coal pillar reinforcing method of waste resource utilization of the present application;

[0037] Figure 4 is the HDPE pipe mold connection operation schematic diagram in the coal pillar reinforcing method of waste resource utilization of the present application.

[0038] BRIEF DESCRIPTION OF DRAWINGS 1, coal pillar; 2, HDPE pipe mold; 3, coal gangue concrete; 4, FRP fiber cloth; 5, aluminum silicate carbon fiber blanket; 6, connection structure one; 7, connection structure two; 8, connection structure three. DETAILED DESCRIPTION

[0039] This embodiment discloses a method for reinforcing coal pillars through waste resource utilization, comprising the following steps:

[0040] Step 1: Design a slotting pattern on coal pillar 1, ensuring that the stability of the coal pillar is not affected;

[0041] Step 2: Prefabricate the grooved mold. The grooved mold is spliced ​​and surrounded on the outside of the coal pillar 1 in Step 1. After the grooved mold is fitted and embedded into the coal pillar 1, coal gangue concrete 3 is filled into the grooved mold.

[0042] It also includes step three: select FRP fiber cloth 4, apply a layer of adhesive evenly to the inner surface of FRP fiber cloth 4, wrap the inner surface of FRP fiber cloth 4 along the outer surface of the grooved mold, and apply a layer of adhesive evenly to the outer surface of FRP fiber cloth 4.

[0043] It also includes step four: laying a fireproof material layer. The fireproof material is aluminum silicate fiber blanket, which is wrapped around the outer surface of FRP fiber cloth. In step four, the fireproof material in the fireproof layer is aluminum silicate fiber blanket.

[0044] In step one, when there are cracks on the outer surface of coal pillar 1, water glass or epoxy resin is used to fill and repair the cracks, and then the grooving design continues on coal pillar 1.

[0045] In step two, adjacent grooved molds are connected by mortise and tenon joints.

[0046] Specifically, such as Figure 4 As shown, the grooved mold is prefabricated using HDPE pipe, and it is an HDPE pipe mold; wherein the connection method between adjacent modules is: the two ends of the pipe wall connection of the HDPE pipe are prefabricated into connection structure one 6, connection structure two 7, and connection structure three 8.

[0047] Among them, the first connecting structure 6 is located on the outside of the pipe wall connection at one end of the grooved mold, and the second connecting structure is located on the inside of the pipe wall connection at the other end. A groove is drilled on the outer surface of the pipe wall of the second connecting structure, the position of the groove is opposite to the groove of the second connecting structure, and the size of the groove is the same as that of the connecting structure. The modules of each HDPE pipe are the same. After the grooved mold is fitted along the coal pillar groove, the empty groove of the grooved mold is filled with coal gangue concrete.

[0048] Specifically, the grooved mold can be prefabricated into a mold that can be spliced ​​up and down according to the height of the coal pillar.

[0049] In this embodiment, in step three, the material selected for the FRP fiber cloth is any one of carbon fiber reinforced composite material, glass fiber reinforced composite material, aramid fiber reinforced composite material, and basalt fiber reinforced composite material.

[0050] In step two and step three, the HDPE pipe wall thickness is T mm, the FRP fiber cloth winding layer is N, the coal pillar height is H meters, and if the coal pillar cross section shape is circular, the coal pillar diameter is D meters, then the following four cases need to be discussed:

[0051] (1) When H≤3, D≤8, T=5, N=3;

[0052] (2) When 3

[0053] (3) When 5

[0054] (4) When H>7, D>25, T=20, N=9.

[0055] If the coal pillar cross section shape is polygonal, then the formula is used to determine the number of FRP fiber cloth winding layers, where n is the number of sides of the polygon, and n is a positive integer greater than or equal to 4, D is the equivalent diameter of the coal pillar, is the side length of the polygon.

[0056] Wherein in step three, the last lap length of the FRP fiber cloth during winding is Δ, if the coal pillar cross section shape is circular, then ; if the coal pillar cross section shape is polygonal, then , where b max is the longest side of the polygon.

[0057] Application example

[0058] The coal pillar reinforcement method for waste resource utilization includes the following steps:

[0059] Step one: groove design is carried out on the coal pillar 1 under the condition of ensuring the stability of the coal pillar;

[0060] Step two: a prefabricated HDPE pipe mold 2 with a groove mold is used, the HDPE pipe mold 2 with a groove mold is composed of four modules, each module is provided with a prefabricated hole, the HDPE pipe mold 2 is embedded along the coal pillar 1 groove, and the coal gangue concrete 3 is filled in the HDPE pipe mold 2 mold cavity, which solves the problem of accumulation and land occupation of coal gangue, and reduces the pollution of coal gangue to the ecological environment;

[0061] Step three: select FRP fiber cloth 4, evenly apply a layer of adhesive on the inner surface of the FRP fiber cloth 4, wrap the FRP fiber cloth 4 along the outer surface of the HDPE pipe 1 mold, and evenly apply a layer of adhesive on the outer surface of the FRP fiber cloth 4.

[0062] Step four: laying fireproof material layer, fireproof material uses aluminum silicate fiber blanket 5, aluminum silicate fiber blanket 5 is wound on the outer surface of FRP fiber cloth 4, and the coal pillar 1 reinforcement process is completed.

[0063] As shown in Figure 2 ; FRP fiber cloth 4 has the characteristics of high tensile strength, corrosion resistance, light weight, high hardness and fatigue resistance, which can effectively improve the compression resistance of coal pillar 1, and the selected material of FRP fiber cloth 4 is any one of carbon fiber reinforced composite material, glass fiber reinforced composite material, aramid fiber reinforced composite material and basalt fiber reinforced composite material; HDPE pipe mold 2 is a kind of environmental protection material, which has the characteristics of light weight, convenient installation and operation, etc., and the pipe wall thickness of HDPE pipe mold 2 is T mm, the winding layer number of FRP fiber cloth 4 is N, and the height of coal pillar 1 is H meters. If the cross-sectional shape of coal pillar 1 is circular, and the diameter of coal pillar 1 is D meters, the following cases need to be discussed: when H≤3, D≤8, T=5, N=3; when 3 , where D is the diameter of coal pillar 1; if the cross-sectional shape of coal pillar 1 is polygon, then , where b max is the longest side of the polygon;

[0064] As shown in Figure 3 , the prefabricated HDPE pipe mold 2 is composed of four modules and has a hollow slot to fill coal gangue concrete 3, which solves the pollution problem of coal gangue to the ecological environment; as shown in Figure 4 ​​As shown, the four modules of the HDPE pipe mold 2 are connected, the wall connection of the HDPE pipe mold 2 is prefabricated into a connection structure one 6, a connection structure two 7, a connection structure three 8 is created, and the connection structure one 6 is outside the wall connection of the one end module, the connection structure two 7 is between the wall connection of the other end module, and a hole groove is opened on the outer surface of the wall of the connection structure two 7, the position of the hole groove is opposite to the groove of the connection structure two 7, and the size of the hole groove is consistent with the size of the connection structure 8, and the four modules of the HDPE pipe mold 2 are made in this way, and the HDPE pipe mold 2 can be prefabricated into a mold that can be spliced up and down according to the height of the coal column 1, and the connection method is the same as the method described above, this installation method is simple to operate, convenient to splice and install, and the material is a non-metallic environmentally friendly material, there is no need to worry about the sparks caused by metal friction, which affects the life safety of underground workers, and has good economic benefits and promotion prospects.

[0065] The above embodiments only describe the preferred modes of the present application, and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements of the technical solutions of the present application made by those skilled in the art shall fall within the protection scope determined by the claims of the present application.

Claims

1. A coal pillar reinforcement method for waste resource utilization, characterized in that: The method comprises the following steps: Step one: groove design on the coal pillar under the condition of ensuring the stability of the coal pillar; Step two: prefabricate the grooved mold, which is assembled around the coal pillar in step one, and fill the coal gangue concrete in the grooved mold after the grooved mold is attached to the coal pillar and embedded; Step three: select FRP fiber cloth, evenly apply a layer of adhesive on the inner surface of the FRP fiber cloth, and wrap the FRP fiber cloth along the outer surface of the grooved mold, and evenly apply a layer of adhesive on the outer surface of the FRP fiber cloth; Step four: lay a layer of fireproof material, use aluminum silicate fiber blanket, and wrap the aluminum silicate fiber blanket on the outer surface of the FRP fiber cloth; In step two, the adjacent grooved molds are connected through mortise and tenon structure; The grooved mold is prefabricated through HDPE pipe; the connection mode between adjacent HDPE pipes is that the pipe wall connection of the HDPE pipe is prefabricated into connection structure one, connection structure two, and connection structure three; The connection structure one is outside the pipe wall connection at one end of the HDPE pipe, the connection structure two is between the pipe wall connection at the other end, and a hole groove is opened on the outer surface of the pipe wall of the connection structure two, the position of the hole groove is opposite to the recess of the connection structure two, and the size of the hole groove is consistent with the size of the connection structure three, the modules of each HDPE pipe are the same, and the coal gangue concrete is filled in the groove of the grooved mold after the grooved mold is embedded along the coal pillar groove.

2. The coal pillar reinforcement method for waste resource utilization according to claim 1, characterized by: In step one, when there are cracks on the outer surface of the coal pillar, use water glass or epoxy resin glue to fill and repair the cracks, and then continue to groove design on the coal pillar.

3. The coal pillar reinforcement method for waste resource utilization according to claim 1, characterized by: In step two, the coal gangue concrete is 40%-45% coal gangue instead of coarse aggregate in concrete; The grooved mold is prefabricated according to the height of the coal pillar to form a mold that can be assembled up and down.

4. The coal pillar reinforcement method for waste resource utilization according to claim 1, characterized by: In step three, the material of the FRP fiber cloth is selected from any one of carbon fiber reinforced composite material, glass fiber reinforced composite material, aramid fiber reinforced composite material, and basalt fiber reinforced composite material.

5. The coal pillar reinforcement method for waste resource utilization according to claim 1, characterized in that: In step two and step three, the pipe wall thickness of the HDPE pipe is T mm, the number of FRP fiber cloth winding layers is N, the height of the coal pillar is H meters, and if the cross-sectional shape of the coal pillar is circular, the diameter of the coal pillar is D meters, then the following four cases need to be discussed: (1) when H≤3, D≤8, T=5, N=3; (2) when 3 (3) when 5 (4) when H>7, D>25, T=20, N=9; If the cross-sectional shape of the coal pillar is a polygon, then the formula is used to determine the number of layers of FRP fiber cloth winding, wherein n is the number of sides of the polygon, and n is a positive integer greater than or equal to 4, D is the equivalent diameter of the coal pillar, b i is the side length of the polygon.

6. The coal pillar reinforcement method for waste resource utilization according to claim 5, characterized in that: In step three, if the last lap length of the FRP fiber cloth in the process of winding is Δ, if the coal pillar cross section shape is circular, then If the coal pillar cross section shape is polygon, then Wherein b max is the longest side of the polygon.

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