Maintenance construction method for underground coal bunker of coal mine

Abstract

The invention provides a coal mine underground coal bunker maintenance construction method. The method comprises the following steps that constructors enter a coal bunker, a damaged part is determined, a working platform is erected, gravel on the damaged part is cleaned, and a proper amount of concrete slurry is prepared; hanging a net on the damaged part to enable the net surface to cover the damaged part, and injecting anchor rods on the net surface to reinforce and support; a formwork is supported at the hanging net and fixed to the bin wall, the damaged part is covered with the formwork, and a pouring space is formed at the damaged bin wall; and prepared concrete slurry is poured into the pouring space, sealing is conducted after pouring is completed, after the concrete slurry is solidified, the formwork is removed, wear-resistant materials are smeared on the surface of the solidified concrete and the joint of the concrete and the silo wall, and trowelling and natural drying are conducted. The firmness degree of the maintained bunker wall can be improved, and the service life of the coal bunker is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of coal bunker maintenance, and in particular to a coal bunker maintenance construction method in a coal mine. Background Art

[0002] Coal bunkers are cast underground in mines to store mined coal. However, due to the long-term impact of large pieces of coal (gangue), the original cast-in-place structure of the bunker wall is damaged and collapsed, seriously affecting the normal use of the bunker. The maintenance of the coal bunker is usually based on the maintenance system of different units. The coal bunker is emptied regularly, and construction workers are lowered into the coal bunker with a sling. The damaged location is found through manual inspection, and then the damaged location is sealed and fixed with plates. However, although this method can temporarily solve the sealing problem, it is not strong enough, and the interior of the damaged area has not been repaired. There is a risk of further collapse under the impact of coal flow. The damaged and collapsed area is getting larger and larger, which increases the difficulty of subsequent maintenance and affects the service life of the coal bunker and the normal operation of the coal flow system. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, an embodiment of the present invention provides a coal bunker maintenance construction method for a coal mine, which improves the firmness of the bunker wall after maintenance and extends the service life of the coal bunker.

[0004] The embodiment of the present invention provides a coal bunker maintenance construction method in a coal mine, comprising the following steps:

[0005] S1. Construction workers enter the coal bunker, identify the damaged parts of the bunker wall, set up a working platform, clean the sand and gravel from the damaged parts, and prepare an appropriate amount of concrete slurry according to the size of the damaged parts;

[0006] S2. Hang a mesh on the damaged part so that the mesh covers the damaged part, and inject anchor rods into the mesh surface for reinforcement support;

[0007] S3. Support the formwork at the mesh hanging location and fix it to the silo wall. The formwork covers the damaged area, forming a pouring space at the damaged silo wall, and leaving an entrance for pouring above the formwork.

[0008] S4. Pour the prepared concrete slurry into the pouring space, seal it after pouring, remove the formwork after the concrete slurry solidifies, apply wear-resistant material on the solidified concrete surface and the joint between the concrete and the warehouse wall, smooth it, and let it dry naturally.

[0009] In some embodiments, in step S1, the bottom plate of the coal bunker is compacted before setting up the working platform.

[0010] In some embodiments, in step S1, the working platform is constructed by using rack poles and bamboo rack boards.

[0011] In some embodiments, the concrete slurry includes sand, cement, a setting accelerator, and an early strength agent, and is stirred evenly during use.

[0012] In some embodiments, the amount of the accelerating agent is 4-8% by weight of the cement, and the amount of the early strength agent is 3-6% by weight of the cement.

[0013] In some embodiments, in step S2, when anchor rods are injected into the mesh surface, anchor rods are injected into the upper, lower and middle parts of the mesh surface along the periphery of the damaged part.

[0014] In some embodiments, in step S3, the formwork is supported and fixed by a support structure composed of multiple steel pipes.

[0015] In some embodiments, in step S3, the netting is performed step by step according to the size of the damaged part and the mesh surface, so as to completely cover the damaged part.

[0016] In some embodiments, the template is made of steel.

[0017] In some embodiments, in step S4, the wear-resistant material is a high-strength wear-resistant material with a compressive strength greater than or equal to 60 MPa. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings.

[0019] in:

[0020] Figure 1 This is a diagram showing the effect of repairing and constructing an underground coal bunker in a coal mine using the method of an embodiment of the present invention;

[0021] Figure 2 for Figure 1 A top view of

[0022] Reference numerals:

[0023] 1. Coal bunker; 2. Bunker wall; 3. Anchor rod; 4. Concrete slurry; 5. Wear-resistant materials. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0025] The coal bunker maintenance construction method for an underground coal mine according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0026] like Figure 1-2As shown, the embodiment of the present invention provides a coal bunker maintenance construction method in a coal mine, comprising the following steps:

[0027] S1. Construction workers enter the coal bunker 1, identify the damaged part of the bunker wall 2, set up a working platform, clean the sand and gravel from the damaged part, and prepare an appropriate amount of concrete slurry 4 according to the size of the damaged part;

[0028] S2. Hang a mesh on the damaged part so that the mesh covers the damaged part, and inject anchor rods 3 into the mesh surface for reinforcement support;

[0029] S3. Support the formwork at the mesh hanging location and fix it on the silo wall 2. The formwork covers the damaged part, forming a pouring space at the damaged silo wall 2, and leaving an entrance for pouring above the formwork;

[0030] S4, pour the prepared concrete slurry 4 into the pouring space, seal it after pouring, remove the template after the concrete slurry 4 solidifies, apply wear-resistant material 5 on the solidified concrete surface and the junction of the concrete and the warehouse wall 2, smooth it, and dry it naturally.

[0031] By repairing the underground coal bunker 1 using the method of the embodiment of the present invention, the firmness of the bunker wall 2 after repair can be improved, and the service life of the coal bunker 1 can be extended.

[0032] By injecting anchor rods 3 after hanging the net, the stability of the net can be improved and it can be prevented from falling off.

[0033] The formwork is supported at the hanging mesh to enclose a space for pouring.

[0034] By applying the wear-resistant material 5 , the impact wear resistance of the silo wall 2 can be improved.

[0035] Furthermore, if the damaged part is large, resulting in insufficient size of the mesh and template, it can be repaired in sections from bottom to top. First, the lower damaged part is repaired using steps S2-S4, and then the upper damaged part is repaired using steps S2-S4 until the entire damaged part is repaired.

[0036] In some embodiments, in step S1, the bottom plate of the coal bunker 1 is compacted before setting up the working platform, so that the working platform is more firmly placed in the coal bunker 1 and the safety of the construction workers is ensured.

[0037] In some embodiments, in step S1, the working platform is constructed by using rack poles and bamboo rack boards.

[0038] In some embodiments, the concrete slurry 4 includes sand, cement, an accelerating setting agent and an early strength agent, which are mixed evenly when used. By adding the accelerating setting agent and the early strength agent, the setting time of the concrete can be shortened, thereby completing the repair quickly.

[0039] In some embodiments, the amount of the accelerating agent is 4-8% by weight of the cement, and the amount of the early strength agent is 3-6% by weight of the cement.

[0040] In some embodiments, in step S2, when anchor rods 3 are injected into the mesh surface, anchor rods 3 are injected into the upper, lower and middle parts of the mesh surface along the periphery of the damaged part, thereby improving the firmness of the mesh surface.

[0041] In some embodiments, in step S3, the template is supported and fixed by a support structure composed of multiple steel pipes. When the concrete slurry 4 solidifies, the template and the concrete slurry 4 are in contact with each other, and the support structure can be removed and reused.

[0042] In some embodiments, in step S3, the netting is performed step by step according to the size of the damaged part and the mesh surface, so as to completely cover the damaged part.

[0043] In some embodiments, the template is made of steel, which can improve the firmness of the sealing structure and reduce the risk of further damage and collapse.

[0044] In some embodiments, in step S4, the wear-resistant material 5 is a high-strength wear-resistant material with a compressive strength greater than or equal to 60 MPa, thereby further improving wear resistance and reducing the risk of further damage and collapse.

[0045] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0047] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0048] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0049] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0050] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A coal mine underground coal bunker maintenance construction method, characterized in that: The steps include: S1. Construction workers enter the coal bunker, identify the damaged part of the coal bunker wall, set up a working platform, clean the sand and gravel from the damaged part, and prepare an appropriate amount of concrete slurry according to the size of the damaged part; S2, hanging a mesh on the damaged part so that the mesh covers the damaged part, and injecting anchor rods on the mesh surface for reinforcement support; S3. Supporting a formwork at the mesh hanging location and fixing it to the silo wall, the formwork covering the damaged portion, forming a pouring space at the damaged silo wall, and leaving an entrance for pouring above the formwork; S4. Pour the prepared concrete slurry into the pouring space, seal it after pouring, remove the formwork after the concrete slurry solidifies, apply wear-resistant material on the surface of the solidified concrete and the junction between the concrete and the warehouse wall, smooth it, and let it dry naturally.

2. The coal mine underground coal bunker maintenance construction method according to claim 1, characterized in that: In step S1, the bottom plate of the coal bunker is compacted before setting up the working platform.

3. The coal mine underground coal bunker maintenance construction method according to claim 1, characterized in that: In step S1, the working platform is constructed by using rack poles and bamboo rack boards.

4. The coal mine underground coal bunker maintenance construction method according to claim 1, characterized in that: The concrete slurry includes sand, gravel, cement, quick-setting agent and early strength agent, and is stirred evenly when used.

5. The coal bunker maintenance construction method for a coal mine according to claim 4, characterized in that: The dosage of the quick-setting agent is 4-8% of the weight of the cement, and the dosage of the early strength agent is 3-6% of the weight of the cement.

6. The coal bunker maintenance construction method for a coal mine according to claim 1, characterized in that: In step S2, when injecting the anchor rods into the mesh surface, the anchor rods are injected into the upper, lower and middle parts of the mesh surface along the periphery of the damaged part.

7. The coal mine underground coal bunker maintenance construction method according to claim 1, characterized in that: In step S3, the template is supported and fixed by a supporting structure composed of multiple steel pipes.

8. The coal mine underground coal bunker maintenance construction method according to claim 1, characterized in that: In step S3, the netting is hung step by step according to the damaged part and the size of the net surface, so as to completely cover the damaged part.

9. The coal mine underground coal bunker maintenance construction method according to claim 1, characterized in that: The template is made of steel.

10. The coal mine underground coal bunker maintenance construction method according to claim 1, characterized in that: In step S4, the wear-resistant material is a high-strength wear-resistant material with a compressive strength greater than or equal to 60 MPa.

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