Advanced pre-grouting support structure in abnormal area of coal mine

Abstract

The utility model discloses a coal mine abnormal area advance pre -grouting support structure relates to advance pre -grouting roof reinforcement technical field. Including: top surface lower layer grouting pipe, top surface upper layer grouting pipe, outwardly arranged grouting pipe and country rock side wall grouting pipe, top surface lower layer grouting pipe and top surface upper layer grouting pipe are arranged in the country rock top through punching and carry out grouting, and top surface upper layer grouting pipe is located in the both sides of top surface lower layer grouting pipe and is extended to the position above top surface lower layer grouting pipe from bottom to upwards through the inclined arrangement. Form the complete grouting curtain zone with country rock together and bear the mine pressure in the country rock periphery and interior, prevent the adverse effect of broken country rock, mining influence. Meanwhile, this method can effectively control the distribution of roof stress, improve the construction effect, avoid the roof caving, coal wall spalling, country rock deformation, the problem of easy instability after being influenced by mining to a great extent, provides the new technical path for the safety production of mine and the improvement of coal production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of advanced pre-grouting reinforcement of the roof, and in particular to advanced pre-grouting support structure in abnormal areas of coal mines. Background Technology

[0002] Grouting reinforcement technology is a core method for reinforcing fractured surrounding rock and weak strata, and it is widely used in engineering fields such as mines, tunnels, slopes, and dam foundations. From the perspective of engineering practice, grouting reinforcement technology improves the strength of fractured zones and surrounding rock in roadways, forming an ideal consolidated integral load-bearing structure, reducing the degree of surrounding rock deformation, and effectively filling the water-conducting paths in the surrounding rock fissures. This achieves the purpose of grouting reinforcement, ensures safe production, and yields excellent engineering practice results.

[0003] In existing technologies, when the working face passes through abnormally fractured zones, the geological structure of this area is complex, the coal seam is broken and undulating, which has a significant impact on mining. It may face problems such as roof collapse, coal wall spalling, surrounding rock deformation, and instability after being affected by mining, leading to safety hazards and reduced production efficiency. Measures need to be taken in advance.

[0004] Therefore, based on the above-mentioned technical problems, those skilled in the art urgently need to develop advanced pre-grouting support structures for abnormal areas in coal mines. Utility Model Content

[0005] The purpose of this utility model is to provide a pre-grouting support structure for abnormal coal mine areas that uses advanced pre-grouting technology to form a complete grouting curtain zone around and inside the surrounding rock, which together with the surrounding rock bears the mine pressure, thereby preventing the adverse effects of broken surrounding rock and mining.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] This utility model relates to an advanced pre-grouting support structure for abnormal zones in coal mines, comprising:

[0008] The lower grouting pipe on the top surface, the upper grouting pipe on the top surface, the outwardly arranged grouting pipe, and the grouting pipe on the side wall of the surrounding rock;

[0009] The lower grouting pipe and the upper grouting pipe are arranged on the top of the surrounding rock through drilling and grouting is performed. The upper grouting pipe is located on both sides of the lower grouting pipe and extends from the bottom upward to the position above the lower grouting pipe by an inclined arrangement.

[0010] The outwardly arranged grouting pipes are arranged on the top of the surrounding rock through drilling and grouting is performed. The outwardly arranged grouting pipes are two sets arranged on both sides of the upper grouting pipe on the top surface.

[0011] The grouting pipes for the surrounding rock sidewalls are installed by drilling holes in the surrounding rock sidewalls.

[0012] Furthermore, along the direction of the coal mine working face: the inclination angle of the lower layer grouting pipe on the top surface is 30°, the inclination angle of the upper layer grouting pipe on the top surface is 45°, the inclination angle of the outwardly arranged grouting pipe is 60°, and the inclination angle of the grouting pipe on the surrounding rock sidewall is 30°.

[0013] Furthermore, among the top upper grouting pipes distributed on both sides of the lower grouting pipe on the top surface, at least two sets of the top upper grouting pipes on each side are arranged along the extension direction of the lower grouting pipe on the top surface.

[0014] Furthermore, at least two sets of the outwardly arranged grouting pipes are arranged in the extension direction of the lower grouting pipes on the top surface.

[0015] Furthermore, at least two sets of the grouting pipes for the surrounding rock sidewall are arranged in the extension direction of the grouting pipes in the lower layer of the top surface.

[0016] This utility model has the following beneficial effects.

[0017] This invention forms a complete grouting curtain zone around and inside the surrounding rock, which, together with the surrounding rock, bears the mining pressure and prevents adverse effects from broken surrounding rock and mining activities. Simultaneously, this method effectively controls the distribution of roof stress, improves construction efficiency, and largely avoids problems such as roof collapse, coal wall spalling, surrounding rock deformation, and instability after mining activities. It provides a new technical approach for safe mine production and improved coal production efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 This is a schematic diagram of the pre-grouting support structure for abnormal areas in coal mines provided in this embodiment of the utility model.

[0020] Figure 2 A comparative schematic diagram of the distribution angles of the top layer grouting pipe, the outwardly arranged grouting pipe, and the grouting pipe distribution angle of the pre-grouting support structure in the abnormal zone of a coal mine provided in this embodiment of the utility model;

[0021] Figure 3 A schematic diagram showing the distribution of the lower grouting pipe on the top surface, the upper grouting pipe on the top surface, the outwardly arranged grouting pipe, and the grouting pipe on the sidewall of the surrounding rock in the pre-grouting support structure of the abnormal zone in a coal mine provided in this embodiment of the utility model.

[0022] Figure 4A schematic diagram showing the distribution angle between the lower grouting pipe on the top surface and the grouting pipe on the sidewall of the surrounding rock of the pre-grouting support structure in the abnormal zone of a coal mine, provided in this embodiment of the utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Lower grouting pipe on the top surface; 2. Upper grouting pipe on the top surface; 3. Outwardly arranged grouting pipes; 4. Grouting pipes on the sidewalls of the surrounding rock. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solution of this utility model, a further detailed description of this utility model will be provided below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] See Figures 1 to 4 As shown;

[0027] This embodiment discloses an advanced pre-grouting support structure for abnormal zones in coal mines, including:

[0028] The top lower grouting pipe 1, the top upper grouting pipe 2, the outwardly arranged grouting pipe 3, and the surrounding rock sidewall grouting pipe 4;

[0029] The lower grouting pipe 1 and the upper grouting pipe 2 are arranged at the top of the surrounding rock through drilling and grouting. The upper grouting pipe 2 is located on both sides of the lower grouting pipe 1 and extends from the bottom to the upper position of the lower grouting pipe 1 through an inclined arrangement. The lower grouting pipe 1 and the upper grouting pipe 2 form a three-dimensional grouting distribution, which effectively improves the stability of the pre-grouting support structure. The distribution of the lower grouting pipe 1 and the upper grouting pipe 2 from bottom to top ensures the construction sequence of grouting the lower layer first and then the upper layer. The support structure that combines the lower and upper layers of the lower grouting pipe 1, the upper grouting pipe 2, the outwardly arranged grouting pipe 3, and the grouting pipe 4 of the surrounding rock sidewall is more stable.

[0030] The outward-arranged grouting pipes 3 are arranged on the top of the surrounding rock through drilling and grouting. The outward-arranged grouting pipes 3 are two sets arranged on both sides of the upper grouting pipes 2 on the top surface. The outward-arranged grouting pipes 3 effectively support the outer part of the surrounding rock through grouting.

[0031] The grouting pipe 4 is installed in the side wall of the surrounding rock through drilling, thus providing support for the side wall of the surrounding rock as well.

[0032] Specifically, this support device injects grout at specific locations through the lower grouting pipe 1 on the top surface, the upper grouting pipe 2 on the top surface, the outwardly arranged grouting pipe 3, and the grouting pipe 4 on the side wall of the surrounding rock. This grouting distribution pattern forms a stable support structure, creating a complete grouting curtain zone around and inside the surrounding rock. Together with the surrounding rock, it bears the mining pressure and prevents the adverse effects of broken surrounding rock and mining.

[0033] Furthermore, along the direction of the coal mine working face: the lower grouting pipe 1 on the top surface has an inclination angle of 30°, and the upper grouting pipe 2 on the top surface has an inclination angle of 45°, so that the lower grouting pipe 1 on the top surface and the upper grouting pipe 2 on the top surface form a three-dimensional distribution structure for grouting, making the grouting structure complete and the support structure formed after grouting stable. The outwardly arranged grouting pipe 3 has an inclination angle of 60°, so that the outer part of the surrounding rock is effectively supported by grouting through the outwardly arranged grouting pipe 3. The grouting pipe 4 on the side wall of the surrounding rock has an inclination angle of 30°, so as to effectively support the side wall of the surrounding rock.

[0034] Furthermore, among the top upper grouting pipes 2 distributed on both sides of the lower grouting pipe 1, at least two sets of top upper grouting pipes 2 are arranged along the extension direction of the lower grouting pipe 1 on each side, so that the top upper grouting pipes 2 are distributed along the length direction of the lower grouting pipe 1 to form a complete three-dimensional spatial distribution.

[0035] Furthermore, at least two sets of outward-facing grouting pipes 3 are arranged in the extension direction of the lower grouting pipe 1 on the top surface.

[0036] Furthermore, at least two sets of grouting pipes 4 are arranged in the extension direction of the lower grouting pipe 1 on the top surface of the surrounding rock sidewall.

[0037] Similarly, the outward-facing grouting pipe 3 and the surrounding rock sidewall grouting pipe 4 are arranged in the same direction as the extension of the lower grouting pipe 1 on the top surface, so as to fully deploy the advanced pre-grouting support structure on the working face of the entire coal mine abnormal zone, so as to achieve more effective support.

[0038] In the above technical solution, the pre-grouting support structure for abnormal zones in coal mines provided by this utility model has the following beneficial effects:

[0039] This invention forms a complete grouting curtain zone around and inside the surrounding rock, which, together with the surrounding rock, bears the mining pressure and prevents adverse effects from broken surrounding rock and mining activities. Simultaneously, this method effectively controls the distribution of roof stress, improves construction efficiency, and largely avoids problems such as roof collapse, coal wall spalling, surrounding rock deformation, and instability after mining activities. It provides a new technical approach for safe mine production and improved coal production efficiency.

[0040] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A pre-grouting support structure for abnormal zones in coal mines, characterized in that, include: The top surface lower layer grouting pipe (1), the top surface upper layer grouting pipe (2), the outwardly arranged grouting pipe (3), and the surrounding rock sidewall grouting pipe (4); The lower grouting pipe (1) and the upper grouting pipe (2) are arranged on the top of the surrounding rock by drilling and grouting is performed. The upper grouting pipe (2) is located on both sides of the lower grouting pipe (1) and extends from the bottom to the upper position of the lower grouting pipe (1) by an inclined arrangement. The outwardly arranged grouting pipe (3) is arranged on the top of the surrounding rock by drilling and grouting is performed. The outwardly arranged grouting pipe (3) consists of two sets arranged on both sides of the upper grouting pipe (2) on the top surface. The grouting pipe (4) of the surrounding rock sidewall is arranged in the position of the surrounding rock sidewall by drilling.

2. The pre-grouting support structure for abnormal zones in coal mines according to claim 1, characterized in that, Along the direction of the coal mine working face: the lower grouting pipe (1) on the top surface has an inclination angle of 30°, the upper grouting pipe (2) on the top surface has an inclination angle of 45°, the outwardly arranged grouting pipe (3) has an inclination angle of 60°, and the grouting pipe (4) on the side wall of the surrounding rock has an inclination angle of 30°.

3. The pre-grouting support structure for abnormal zones in coal mines according to claim 1, characterized in that, Among the top upper grouting pipes (2) distributed on both sides of the top lower grouting pipe (1), at least two sets of the top upper grouting pipes (2) on each side are arranged along the extension direction of the top lower grouting pipe (1).

4. The pre-grouting support structure for abnormal zones in coal mines according to claim 1, characterized in that, At least two sets of the outwardly arranged grouting pipes (3) are arranged in the extension direction of the lower grouting pipes (1) on the top surface.

5. The pre-grouting support structure for abnormal zones in coal mines according to claim 1, characterized in that, At least two sets of the grouting pipes (4) on the sidewall of the surrounding rock are arranged in the extension direction of the grouting pipes (1) on the top surface.

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