Multi-time multi-stage reuse casing grouting device for roadway protection coal pillar

Abstract

The utility model discloses a roadway protection coal pillar multi-time multi-stage reuse casing pipe grouting device, which belongs to the field of coal mining, and comprises n grouting sections connected through flange plates, n grouting pipes, 2n-1 expansion capsules and a shell, the grouting pipes are arranged in the shell, the expansion capsules are arranged on the surface of the shell and are connected with the grouting pipes through holes in the shell, and the expansion capsules are arranged in the shell. A one-way valve and an explosion valve which are connected with the grouting pipe are arranged on the inner wall surface of the shell; aiming at the circulating crack expansion characteristic of the roadway protection coal pillar and the problems of low efficiency and high cost of the current drilling and grouting technology, the device provided by the utility model can be used for sequentially starting and starting the grouting pipe 1, the grouting pipe 2,..., and the grouting pipe n according to the coal wall reinforcement state after the coal wall is formed and installed, so that the effects of single drilling and multiple grouting are realized. According to the utility model, expansion of multiple cracks of the coal pillar caused by mining-induced stress can be effectively dealt with, the utilization efficiency of formed holes is improved, and the drilling construction cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of coal mining, in particular to a multiple-stage and multiple-use casing grouting device for protecting coal pillars in a tunnel. Background Art

[0002] During coal mine mining, protective coal pillars serve as a crucial safety barrier between the goaf and the roadway. They support the roadway, isolate pressure transmission, and mitigate the effects of mining stress. The stability of the protective coal pillars is directly related to the safe service life of the roadway. Therefore, maintaining their integrity is crucial to ensuring safe coal mine production.

[0003] During working face advancement, the main factor causing coal pillar fractures is the mining disturbance experienced by the protective coal pillar. As mining stresses persist, cracks appear within and on the surface of the coal pillar. The generation and expansion of these cracks are often accompanied by changes in stress. Under the influence of mining stress disturbances, these cracks continue to cyclically expand, weakening the supporting capacity of the coal pillar, causing roadway deformation and even leading to roadway collapse, equipment damage, and casualties, seriously compromising mine safety.

[0004] To address the problem of coal pillar crack expansion, traditional grouting reinforcement methods are widely used for crack repair. Common grouting techniques include one-time full-hole grouting and localized grouting, both of which inject slurry into coal pillar cracks to enhance their strength. However, these methods have significant shortcomings: due to the long-term effects of mining stress, coal pillar cracks may expand multiple times, while traditional grouting methods usually only perform grouting once, making it impossible to repair cracks after they expand, resulting in limited effectiveness. They also reduce drilling costs, improve grouting efficiency, and maintain safe mine production. Utility Model Content

[0005] In order to solve the problem that most of the existing coal mine underground grouting devices in the above-mentioned prior art can only achieve single grouting, and re-grouting requires re-drilling, and the utilization efficiency of single-hole single grouting is low, the utility model provides a tunnel protection coal pillar multiple and multi-stage reuse casing grouting device.

[0006] In order to realize the above technical solution, the utility model provides a multiple and multi-stage reused casing grouting device for coal pillar protection in a tunnel, comprising n grouting sections connected by flanges, n grouting pipes, 2n-1 expansion capsules and an outer shell, the grouting pipes being arranged inside the outer shell, the expansion capsules being arranged on the surface of the outer shell and connected to the grouting pipes through holes on the outer shell, and a one-way valve and a bursting valve connected to the grouting pipes being provided on the inner wall surface of the outer shell; each grouting section comprises an outer shell, a grouting pipe, two expansion capsules, a number of eyelets arranged between the two expansion capsules, a bursting valve and two one-way valves matching the expansion capsules; the nth grouting pipe can control the 2n-1th and 2n-2th expansion capsules; the nth grouting pipe is used for the grouting operation of the nth grouting section.

[0007] Furthermore, the grouting pipe is connected to the one-way valve and the expansion capsule through a three-way pipe, and the bursting valve provided between each grouting section is connected to the extended grouting pipe.

[0008] Furthermore, the nth grouting pipe is connected to the 2n-1 and 2n-2 expansion capsules in a tree shape.

[0009] Furthermore, a circular hole matching the size of the grouting pipe is provided on the flange; the circular hole of the flange is connected to the grouting pipe by a connecting pipe and a quick connector; an annular groove is provided around the circular hole, and a rubber ring is provided inside the annular groove; the two flanges are connected by fixing screws.

[0010] Furthermore, the expansion capsule is connected to a matching burst valve in series.

[0011] Furthermore, the outer shell is cylindrical.

[0012] In summary, the present invention has the following beneficial effects compared to the prior art:

[0013] This utility model provides a multi-stage, multiple-use casing grouting device. Through its multi-stage casing design, it achieves precise grouting at varying depths, improving grouting efficiency. The three-stage multiple-use grouting strategy effectively seals internal cracks in the coal pillar and enhances the overall stability of the coal wall. Compared to traditional grouting methods, this utility model reduces the need for repeated drilling and reduces construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0015] Figure 1 This is a schematic diagram of the relative positions of grouting pipes at all levels on the sealing flange;

[0016] Figure 2This is a schematic diagram of the internal flange connection of the multi-stage and multi-use casing grouting device provided by the utility model;

[0017] Figure 3 This is a schematic diagram of the grouting pipe connecting various components through a tee pipe;

[0018] Figure 4 This is a structural schematic diagram of the multi-stage and multi-reuse casing grouting device of the utility model.

[0019] The above drawings include the following reference numerals:

[0020] 1. Second grouting pipe; 2. First grouting pipe; 3. Third grouting pipe; 4. Expansion capsule; 401. First expansion capsule; 402. Second expansion capsule; 403. Third expansion capsule; 404. Fourth expansion capsule; 405. Fifth expansion capsule; 5. Eyelet; 6. One-way valve; 7. Burst valve; 8. Fixing screw; 9. Rubber ring; 10. Quick connector; 11. Connecting pipe; 12. Tee; 13. Flange; 131. First flange; 132. Second flange; 133. Third flange; 134. Fourth flange; 135. Fifth flange; 14. Housing; 15. Flange fixing one; 16. Flange fixing two. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0023] See also Figures 1 to 4 As shown, the utility model provides a multiple and multi-stage reusable casing grouting device for protecting coal pillars in a tunnel. Taking 2m as each grouting section as an example, it is divided into 3 sections with a total length of 6m, but this is not a limitation. As mentioned above, it can be expanded to n sections, then the total length is 2n (m), and the number of expansion capsules is 2n-1 (pieces).

[0024] The tunnel protection coal pillar multiple multi-stage reuse casing grouting device includes a circular cylinder shell 14, the outer diameter of the circular cylinder wall grouting section is designed to be 89mm, each grouting section is designed to be 2m, and the total length is 6m; an expansion capsule 4 with a length of 150mm is provided, and the expansion capsule 4 is tightly attached to the cylinder shell 14, the position of the first expansion capsule 401 is located 100mm inside the sealing flange 131, and the remaining expansion capsules 4 are staggered 200mm from the internal connection flange position; the grouting cylinder as a whole is divided into three sections (the first grouting section, the second grouting section, and the third grouting section), and each section is connected to the expansion capsule 4 through an opening on the cylinder to connect the internal components (the one-way valve 6, the bursting valve 7 and the internal grouting pipe 1 or 2);

[0025] The connection between the first grouting section and the second grouting section is fixed by flanges 132 and 133, and the connection between the second grouting section and the third grouting section is fixed by flanges (133 and 134). The cylindrical tail end of the third grouting section is directly closed. The grouting section in the area other than the position of the expansion capsule 4 is provided with a preset number of annular eyelets 5. The annular eyelets 5 are arranged at intervals of 200 mm, and the diameter of the eyelets 5 is 8 mm.

[0026] There are three grouting pipes 1, 2, and 3 of different lengths and independently built-in inside the cylinder. The length of the grouting pipe corresponds to the length of the corresponding grouting section. The first grouting pipe 2 of the first grouting section is used for the first grouting, the second grouting pipe 1 of the second grouting section is used for the second grouting, and the third grouting pipe 3 of the third grouting section is used for the third grouting; the first grouting pipe 2 and the second grouting pipe 1 respectively control the first expansion capsule 401, the second expansion capsule 402, the third expansion capsule 403 and the fourth expansion capsule 404, and the fifth expansion capsule 405 attached to the circular cylinder wall; the expansion capsule 4 controlled by the first grouting pipe 2 and the second grouting pipe 1 is correspondingly connected in series with a bursting valve 7.

[0027] As a preferred embodiment, the grouting pipe is connected to the tee 12A side and then connected to the one-way valve 6 and the expansion capsule 4 of the cylindrical shell 14 through the tee 12B side. A bursting valve 7 is provided in the middle part of each grouting section and connected to the extended grouting pipe; the first grouting section includes a first expansion capsule 401 and a second expansion capsule 402, the second grouting section includes a third expansion capsule 403 and a fourth expansion capsule 404, and the third grouting section includes a fifth expansion capsule 405; the grouting pipe 1 and the two expansion capsules 401, 402 of the first grouting section and the third expansion capsule 403 of the second grouting section are connected in series; the grouting pipe 2 and the fourth expansion capsule 405 of the second grouting section and the fifth expansion capsule 405 of the third grouting section are connected in series; the grouting pipe 3 directly enters the grouting device of the third grouting section through the circular hole of the flange;

[0028] As a preferred embodiment, the two flanges 132, 133 at the connection of the first grouting section and the second grouting section and the two flanges 134, 135 at the connection of the second grouting section and the third grouting section are provided with spiral holes 8 on the outer rings of the four flanges so as to connect and fix them in pairs; a circular hole is provided in the middle of the flanges so that the grouting pipe can pass through, as shown in the figure. Figure 1 and hints Figure 2 As shown, in the middle of the two flanges where the circular hole is located, a connecting pipe 11 is used to connect the grouting pipe connected by the quick connector 10; in the middle of the two flanges where the circular hole is located, a connecting pipe 11 is used to connect the grouting pipe connected by the quick connector to ensure the airtightness and quick connection function of each section of the device during grouting;

[0029] As a preferred embodiment, the circular holes for grouting opened on each section of the fixed flange 132, 133, 134, 135 are connected to the grouting pipes 1, 2, 3 using a quick connector 10, and all the circular holes opened are of the same size and position; an annular groove is made around the circular holes opposite to each other on the two flanges as shown in FIG. Figure 2 As shown, a rubber ring 9 is used for sealing;

[0030] This new method achieves precise grouting at varying depths, improving grouting efficiency. The three-step grouting strategy effectively seals internal cracks in the coal pillar and enhances the overall stability of the coal wall. Compared to traditional grouting methods, this method reduces the need for repeated drilling and reduces construction costs.

[0031] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0032] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0033] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A tunnel protection coal pillar multiple multi-stage reuse casing grouting device, characterized in that: The invention comprises n grouting sections connected by flanges (13), n grouting pipes, 2n-1 expansion capsules (4) and a shell (14), wherein the grouting pipes are arranged inside the shell (14), the expansion capsules (4) are arranged on the surface of the shell (14) and connected to the grouting pipes through holes on the shell (14), and a one-way valve (6) and a bursting valve (7) connected to the grouting pipes are provided on the inner wall surface of the shell (14); each grouting section comprises a shell (14), a grouting pipe, two expansion capsules (4), a plurality of eyelets (5) arranged between the two expansion capsules (4), a bursting valve (7) and two one-way valves (6) matched with the expansion capsules (4); the nth grouting pipe can control the 2n-1th and 2n-2th expansion capsules (4); the nth grouting pipe is used for the grouting operation of the nth grouting section.

2. The tunnel protection coal pillar multiple and multi-stage reuse casing grouting device according to claim 1 is characterized in that: The grouting pipe is connected to the one-way valve (6) and the expansion capsule (4) via a three-way pipe (12), and the bursting valve (7) provided between each grouting section is connected to the extended grouting pipe.

3. The tunnel protection coal pillar multiple and multi-stage reuse casing grouting device according to claim 1 is characterized in that: The nth grouting pipe is connected to the 2n-1 and 2n-2 expansion capsules (4) in a tree shape.

4. The multiple-stage and multiple-use casing grouting device for tunnel protection coal pillar according to claim 1 is characterized in that: The flange (13) is provided with a circular hole that matches the size of the grouting pipe; the circular hole of the flange (13) is connected to the grouting pipe via a connecting pipe (11) and a quick connector (10); an annular groove is provided around the circular hole, and a rubber ring (9) is provided inside the annular groove; the two flanges (13) are connected via fixing screws (8).

5. The tunnel protection coal pillar multiple and multi-stage reuse casing grouting device according to claim 1 is characterized in that: The expansion capsule (4) is connected in series to the burst valve (7) matched therewith.

6. The tunnel protection coal pillar multiple and multi-stage reuse casing grouting device according to claim 1 is characterized in that: The shell (14) is cylindrical.

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