A roof surrounding rock gas extraction drilling structure for high gas mine

Abstract

The utility model relates to the technical field of gas extraction drilling structure, especially to a kind of roof surrounding rock gas extraction drilling structure for high gas mine, including extraction pipe, the extraction pipe is installed in extraction borehole, the extraction pipe is fixedly connected with lifting plate, the lifting plate is used to support shaft lining, the middle part of the lifting plate is fixedly connected with air suction pipe, the central axis of the air suction pipe coincides with the central axis of the extraction pipe, the lifting plate is embedded with gas guide pipe, first air bag is installed on the extraction pipe, the gas guide pipe is communicated with the first air bag, the gas injection port of the gas guide pipe is equipped with switch valve, second air bag and third air bag are installed in the lifting plate, the second air bag and the third air bag are communicated with the gas guide pipe.The utility model forms active mechanical lifting structure by lifting plate and bolt, can effectively prevent the direct drop of broken rock layer around orifice, provides direct, reliable safety protection for underground personnel and equipment.

Description

Technical Field

[0001] This utility model relates to the technical field of gas drainage borehole structures, and in particular to a gas drainage borehole structure for the roof surrounding rock of high-gas mines. Background Technology

[0002] Extracting gas from the roof rock of high-gas mines is a key technology for preventing gas outbursts. This technology involves drilling holes in the roof of the roadway to create extraction channels, thereby extracting gas contained in sandstone, limestone, and other roof strata, thus eliminating the risk of outbursts and ensuring mine safety.

[0003] In existing technologies, the structural design of roof gas drainage boreholes typically focuses on the sealing and stability of the deep borehole. For example, Chinese utility model patent CN209179815U discloses a "gas drainage borehole structure with pre-spraying and grouting reinforcement and sealing". Its technical solution mainly involves reinforcing the borehole wall and strengthening the overall sealing effect by spraying and grouting around the borehole after drilling, aiming to improve gas drainage efficiency.

[0004] However, existing borehole structures have significant shortcomings: First, their reinforcement focuses primarily on the borehole wall or deep rock strata, neglecting the localized reinforcement and protection of the borehole opening. Under the influence of downhole pressure, vibration, and mining activities, the coal and rock mass around the opening is prone to stress concentration and fracturing, leading to rockfalls. This not only damages the borehole's sealing and affects extraction efficiency but also endangers personnel safety. Second, existing reinforcement methods (such as shotcreting and grouting) are "one-time" static treatments. Once they fail due to stress changes, they cannot be quickly repaired, lacking maintainability. This results in low reliability and high maintenance costs in dynamic environments, and may even trigger secondary accidents. Utility Model Content

[0005] In order to overcome the problems mentioned in the background art, the present invention provides a drilling structure for gas extraction from the roof surrounding rock in high-gas mines.

[0006] The technical solution is: a borehole structure for gas extraction from the roof surrounding rock in high-gas mines, comprising an extraction pipe installed inside the extraction borehole, a support plate fixedly connected to the extraction pipe for supporting the well wall, an air suction pipe fixedly connected to the middle of the support plate, the central axis of the air suction pipe coinciding with the central axis of the extraction pipe, a ducting pipe embedded within the support plate, a first airbag installed on the extraction pipe, the ducting pipe communicating with the first airbag, a switch valve installed at the air injection port of the ducting pipe, and a second and third airbag installed inside the support plate, both of which are communicating with the ducting pipe.

[0007] Furthermore, the extraction tube is fixed with two symmetrically distributed elastic rings, which are in contact with the first airbag, and the elastic rings have circumferentially equidistant notches.

[0008] Furthermore, the lifting plate has multiple circumferentially equidistant oblique holes, and a pin is installed in the oblique holes of the lifting plate for insertion into the well wall.

[0009] Furthermore, the extraction tube is slidably provided with four circumferentially equidistant limiting blocks, and a spring is fixedly connected between the limiting blocks and the extraction tube. The limiting blocks are provided with inclined surfaces.

[0010] Furthermore, the extraction tube is slidably provided with four first sliding plates, four sliding blocks, and four second sliding plates. The four first sliding plates and the four limiting blocks are staggered. The first sliding plates are fixedly connected to the adjacent sliding blocks. The sliding blocks are provided with inclined surfaces, and the inclined surfaces of the sliding blocks are used to press the adjacent second sliding plates. The second sliding plates are fixedly connected to the extraction tube with springs.

[0011] Furthermore, a sliding ring is provided between the extraction tube and the suction tube in a sealed sliding manner, and a spring is fixedly connected between the sliding ring and the suction tube. The extraction tube is fixedly connected with a plurality of circumferentially equidistant T-tubes, the T-tubes are connected to the first airbag, and a sliding push rod is slidably provided at the lower part of the T-tube. The sliding push rod is fixedly connected to the sliding ring, and the T-tube is equipped with two one-way valves.

[0012] The beneficial effects are as follows: This utility model forms an active mechanical lifting structure through the lifting plate and the pin, which can effectively prevent the broken rock layers around the borehole from falling directly, providing direct and reliable safety protection for personnel and equipment downhole; the multi-stage progressive expansion sealing design of the first airbag, second airbag, and third airbag achieves multi-point and comprehensive sealing along the borehole axis, preventing external air leakage or gas leakage, and ensuring the concentration and efficiency of extracted gas; the entire device adopts non-destructive and detachable installation (such as the pin and airbag can be retracted after deflating), realizing quick disassembly and reuse, significantly reducing the cost per borehole, and improving the utilization rate and economy of the equipment; through the inclined linkage mechanism of the first sliding plate and the second sliding plate, the sliding plate can be automatically inserted into the well wall at the installation end to form an additional anchoring point, which greatly enhances the overall installation stability; through the pressure change in the extraction borehole, the sliding ring drives the sliding push rod to move, automatically replenishing some gas into the airbag, improving the reliability and durability of the device under long-term and pressure fluctuation conditions. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0014] Figure 2 This is a cross-sectional view of the extraction pipe and the lifting plate of this utility model.

[0015] Figure 3 This is a three-dimensional structural diagram of the limiting block and the first sliding plate of this utility model.

[0016] Figure 4 This is a cross-sectional view of the extraction pipe and the gas delivery pipe of this utility model.

[0017] The components and their numbers in the diagram are as follows: 1. Extraction tube, 2. Lifting plate, 3. Inhalation tube, 4. Air guide tube, 5. First airbag, 6. Second airbag, 7. Third airbag, 8. Elastic ring, 9. Pin, 10. Limiting block, 11. First sliding plate, 12. Sliding block, 13. Second sliding plate, 14. Sliding ring, 15. T-connector, 16. Sliding push rod. Detailed Implementation

[0018] The technical solution of this utility model will be further described below with reference to the accompanying drawings.

[0019] Example 1: A borehole structure for gas drainage in the roof surrounding rock of high-gas mines, referring to... Figures 1-3 As shown, the well includes a extraction pipe 1 installed inside an extraction borehole. A support plate 2 is fixedly connected to the extraction pipe 1 to support the well wall. An air intake pipe 3 is fixedly connected to the middle of the support plate 2, with its central axis coinciding with the central axis of the extraction pipe 1. An air guide pipe 4 is embedded within the support plate 2. An annular groove is formed on the side wall of the extraction pipe 1, and a first airbag 5 is installed within this groove. The air guide pipe 4 communicates with the first airbag 5, and a switch valve is installed at the air injection port of the air guide pipe 4. A second airbag 6 and a third airbag 7 are installed within the support plate 2, forming annular shapes. The central axes of the second airbag 6 and the third airbag 7 coincide, and both are connected to the air guide pipe 4. Two symmetrically distributed elastic rings 8 are fixedly connected to the annular groove of the extraction pipe 1. The outer surface of the elastic ring 8 is flush with the outer surface of the extraction pipe 1. The elastic ring 8 is in contact with the first airbag 5. The elastic ring 8 has circumferentially equidistant notches and is used to limit the expansion range of the first airbag 5. The lifting plate 2 has four circumferentially equidistant inclined holes. A pin 9 is installed in the inclined holes of the lifting plate 2. After the pin 9 is inserted into the well wall at an angle, any force that attempts to pull out the lifting plate 2 will cause the inclined surface of the pin 9 to squeeze the well wall rock more tightly, generating huge normal pressure, thereby generating greater static friction and greatly enhancing the reliability of anchoring. The extraction pipe 1 is slidably provided with four circumferentially equidistant limiting blocks 10. Two springs are fixed between the limiting blocks 10 and the extraction pipe 1. The limiting blocks 10 are provided with inclined surfaces, and the inclined surfaces of the four limiting blocks 10 gradually move away from each other from top to bottom.

[0020] Specific working principle: After the extraction borehole is completed, the user inserts the extraction pipe 1 into the extraction borehole and makes the lifting plate 2 fit against the well wall. At this time, the rock strata around the opening of the extraction borehole will squeeze the inclined surfaces of the four limiting blocks 10, causing the limiting blocks 10 to move and compress the springs connected to them. Under the support of the four limiting blocks 10, the central axis of the extraction pipe 1 coincides with the central axis of the extraction borehole. Then, the user inserts the pin 9 into the inclined hole of the lifting plate 2 and nails the pin 9 into the well wall. The extraction pipe 1 and the lifting plate 2 lift the rock strata around the opening of the extraction borehole, preventing them from falling directly into the roadway, providing direct safety protection for the equipment and personnel below. Then, the user uses existing... Gas is injected into the air guide pipe 4 by the air pump. The injected gas is then injected into the first airbag 5, the second airbag 6, and the third airbag 7 through the air guide pipe 4. The first airbag 5 expands and squeezes the elastic ring 8, causing the elastic ring 8 to turn outward and fit against the well wall. Subsequently, the first airbag 5 expands and fits tightly against the well wall, while the second airbag 6 and the third airbag 7 gradually expand and fit tightly against the well wall, improving the sealing between the extraction pipe 1 and the lifting plate 2 and the well wall. This ensures that the suction pipe 3 effectively extracts the gas from the extraction borehole. After the gas collection is completed, the user removes the pin 9 and removes the extraction pipe 1 and the lifting plate 2 from the well wall. The above operation can be repeated when gas collection is needed in other areas.

[0021] Example 2: Based on Example 1, referring to... Figure 3 and Figure 4 As shown, the lower part of the extraction tube 1 is slidably provided with four first sliding plates 11, four sliding blocks 12, and four second sliding plates 13, which are circumferentially equidistant. The first sliding plates 11 and sliding blocks 12 slide in the vertical direction, and the second sliding plates 13 slide in the horizontal direction. The four first sliding plates 11 and four limiting blocks 10 are staggered. The first sliding plates 11 are fixedly connected to the adjacent sliding blocks 12. The sliding blocks 12 are provided with inclined surfaces. The inclined surfaces of the four sliding blocks 12 gradually approach each other from top to bottom. The inclined surfaces of the sliding blocks 12 are used to press the adjacent second sliding plates 13. The second sliding plates 13 are fixedly connected to the extraction tube 1 with springs.

[0022] Specific working principle: During the process of inserting the extraction pipe 1 into the extraction borehole, the first sliding plate 11 contacts the well wall. Then, the user continues to squeeze the extraction pipe 1 and the lifting plate 2. At this time, under the limiting action of the well wall, the first sliding plate 11 moves downward relative to the extraction pipe 1. The first sliding plate 11 drives the sliding block 12 to move. The sliding block 12 moves so that its upper inclined surface presses against the adjacent second sliding plate 13. The second sliding plate 13 will extend out from the extraction pipe 1, and the movement of the second sliding plate 13 will compress the spring connected to it. After the lifting plate 2 moves and fits against the well wall, the first sliding plate 11 moves and fits against the lifting plate 2. At the same time, the second sliding plate 13 moves and inserts into the well wall, further improving the firmness of the extraction pipe 1 installed in the well wall.

[0023] Example 3: Based on Example 2, referring to... Figure 3 and Figure 4 As shown, a sliding ring 14 is provided between the extraction pipe 1 and the suction pipe 3 for sealing and sliding. A convex ring is provided on the side wall of the suction pipe 3. The convex ring of the suction pipe 3 is used to limit the sliding of the sliding ring 14. A spring is fixed between the sliding ring 14 and the suction pipe 3. Four circumferentially equidistant three-way pipes 15 are fixed to the extraction pipe 1. The three-way pipes 15 are connected to the first airbag 5. A sliding push rod 16 is slidably provided at the lower part of the three-way pipe 15. The sliding push rod 16 is fixed to the sliding ring 14. A one-way valve for external gas to enter is installed at the top opening of the three-way pipe 15. A one-way valve for gas inside to enter the first airbag 5 is installed at the middle opening of the three-way pipe 15.

[0024] Specific working principle: After the extraction pipe 1 and the lifting plate 2 are installed, the gas pressure in the extraction borehole will squeeze the sliding ring 14 downward. The sliding ring 14 moves and compresses the spring connected to it. At the same time, the sliding ring 14 drives the four sliding push rods 16 to move downward together. The downward movement of the sliding push rods 16 draws the gas between the extraction pipe 1 and the suction pipe 3 into the three-way pipe 15. As the gas in the extraction borehole is continuously collected, the pressure in the extraction borehole gradually decreases. Under the elastic force of the spring connected to the sliding ring 14, the sliding ring 14 drives the four sliding push rods 16 to move upward together. The sliding push rods 16 push the gas in the three-way pipe 15 into the first airbag 5, causing the first airbag 5 to expand and further fit against the well wall, further improving the sealing between the extraction pipe 1 and the lifting plate 2 and the well wall.

[0025] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A borehole structure for gas drainage from the roof surrounding rock in high-gas mines, characterized in that, The system includes a extraction pipe (1), which is installed inside the extraction borehole. A support plate (2) is fixedly connected to the extraction pipe (1). The support plate (2) is used to support the well wall. An air suction pipe (3) is fixedly connected to the middle of the support plate (2). The central axis of the air suction pipe (3) coincides with the central axis of the extraction pipe (1). A gas guide pipe (4) is embedded in the support plate (2). A first airbag (5) is installed on the extraction pipe (1). The gas guide pipe (4) is connected to the first airbag (5). A switch valve is installed at the air injection port of the gas guide pipe (4). A second airbag (6) and a third airbag (7) are installed inside the support plate (2). Both the second airbag (6) and the third airbag (7) are connected to the gas guide pipe (4).

2. The borehole structure for gas drainage in the roof surrounding rock of a high-gas mine according to claim 1, characterized in that, The extraction tube (1) is fixed with two symmetrically distributed elastic rings (8), the elastic rings (8) are in contact with the first airbag (5), and the elastic rings (8) have circumferentially equidistant notches.

3. The borehole structure for gas drainage in the roof surrounding rock of a high-gas mine according to claim 2, characterized in that, The lifting plate (2) has multiple oblique holes that are circumferentially distributed. A pin (9) is installed in the oblique holes of the lifting plate (2) and is used to be inserted into the well wall.

4. The borehole structure for gas drainage in the roof surrounding rock of a high-gas mine according to claim 3, characterized in that, The extraction tube (1) is slidably provided with four circumferentially equidistant limiting blocks (10), and a spring is fixed between the limiting block (10) and the extraction tube (1). The limiting block (10) is provided with an inclined surface.

5. A borehole structure for gas drainage in the roof surrounding rock of a high-gas mine according to claim 4, characterized in that, The extraction tube (1) is slidably provided with four first sliding plates (11), four sliding blocks (12) and four second sliding plates (13). The four first sliding plates (11) and the four limiting blocks (10) are staggered. The first sliding plates (11) are fixedly connected to the adjacent sliding blocks (12). The sliding blocks (12) are provided with inclined surfaces. The inclined surfaces of the sliding blocks (12) are used to press the adjacent second sliding plates (13). The second sliding plates (13) are fixedly connected to the extraction tube (1) with springs.

6. A borehole structure for roof gas drainage in high-gas mines according to claim 5, characterized in that, A sliding ring (14) is provided between the extraction pipe (1) and the suction pipe (3) for sealing and sliding. A spring is fixed between the sliding ring (14) and the suction pipe (3). A plurality of three-way pipes (15) are fixedly distributed circumferentially on the extraction pipe (1). The three-way pipes (15) are connected to the first airbag (5). A sliding push rod (16) is slidably provided at the lower part of the three-way pipe (15). The sliding push rod (16) is fixedly connected to the sliding ring (14). Two one-way valves are installed on the three-way pipe (15).

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