Single-hole multi-measuring-point type gas pressure monitoring device

Abstract

The invention relates to the technical field of coal seam gas pressure measurement, in particular to a single-hole multi-measuring-point type gas pressure monitoring device which comprises a measuring pipe body. The measuring tube body comprises a first-stage measuring tube, a second-stage measuring tube, a third-stage measuring tube and a fourth-stage measuring tube; according to the invention, a first-stage measuring pipe, a second-stage measuring pipe, a third-stage measuring pipe, a fourth-stage measuring pipe, a first air inlet pipe, a second air inlet pipe, a third air inlet pipe and a fourth air inlet pipe are arranged, and measuring points on the first-stage measuring pipe, the second-stage measuring pipe, the third-stage measuring pipe and the fourth-stage measuring pipe are respectively connected with the first air inlet pipe, the second air inlet pipe, the third air inlet pipe and the fourth air inlet pipe; the four measuring points are annularly distributed, when the measuring pipe body is installed, the measuring pipe body is spliced firstly, then the measuring pipe body can be placed into a drilled hole formed in advance, at the moment, the first-stage measuring pipe, the second-stage measuring pipe, the third-stage measuring pipe and the fourth-stage measuring pipe can monitor the four measuring points respectively, repeated punching construction is avoided, and the construction efficiency is improved. And the work amount and the test cost are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of coal seam gas pressure measurement, and in particular to a single-hole multi-measurement-point gas pressure monitoring device. Background Art

[0002] Coal is the main energy source in my country, and gas disasters have long threatened mine safety. Highlighting the danger prediction and early warning is crucial to the prevention and control of gas disasters. These tasks cannot avoid the measurement of parameters such as gas pressure. How to accurately measure parameters such as coal seam gas pressure is of great significance to the gas prevention and control in Guizhou coal mines.

[0003] At present, coal seam gas pressure is mainly measured by one hole and one pressure, which cannot effectively realize segmented pressure measurement. If the gas pressure of multiple coal seams is to be measured, multiple boreholes must be constructed, resulting in large construction volume and high testing costs. Therefore, the development of a single-hole multi-measurement point gas pressure monitoring device is imminent.

[0004] Therefore, in view of the above-mentioned current coal seam gas pressure measurement is mainly one hole one pressure, can not effectively realize segmented pressure measurement, if want to measure the gas pressure of multiple coal seams to construct multiple boreholes, resulting in large construction volume, high testing cost, a single hole multi-measuring point gas pressure monitoring device can be designed, by setting a primary measuring tube, a secondary measuring tube, a tertiary measuring tube, a quaternary measuring tube, an air intake pipe one, an air intake pipe two, an air intake pipe three and an air intake pipe four, the primary measuring tube, the secondary measuring tube, the tertiary measuring tube and the quaternary measuring tube are connected to the air intake pipe one, the air intake pipe two, the air intake pipe three and the air intake pipe four at the measuring points respectively, the four measuring points are distributed in a ring, when installing the measuring tube body, first splice the measuring tube body, then can place the measuring tube body into the pre-opened borehole, at this time the primary measuring tube, the secondary measuring tube, the tertiary measuring tube and the quaternary measuring tube can respectively monitor the four measuring points, avoid multiple drilling construction, reduce the engineering volume and testing cost. Summary of the invention

[0005] In order to overcome the problem that the current coal seam gas pressure measurement is mainly one hole one pressure, and segmented pressure measurement cannot be effectively realized, if the gas pressure of multiple coal seams is to be measured, multiple boreholes must be constructed, resulting in large construction volume and high testing costs.

[0006] The technical scheme of the present invention is: a single-hole multi-measurement point type gas pressure monitoring device, comprising a measuring tube body; the measuring tube body comprises a primary measuring tube, a secondary measuring tube, a tertiary measuring tube and a quaternary measuring tube, the primary measuring tube is provided with a head end at the rear side, the quaternary measuring tube is provided with a tail end at the front side, the first-level measuring tube is connected to an air intake pipe 1 at the lower left end of the first-level measuring tube, the rear end of the air intake pipe 1 is opened at the lower left end of the first-level measuring tube, the second-level measuring tube is connected to an air intake pipe 2 at the upper right end of the second-level measuring tube, the rear end of the air intake pipe 2 is opened at the upper right end of the second-level measuring tube, the tertiary measuring tube is connected to the lower left end of the first-level measuring tube, the rear end of the air intake pipe 2 is opened at the upper right end of the second-level measuring tube, the tertiary measuring tube is connected to the lower left end of the first-level measuring tube, the rear end of the air intake pipe 2 is opened at the upper right end of the second-level measuring tube, the tertiary measuring tube is connected to the lower left end of the first-level measuring tube, the tertiary measuring tube is connected to the lower right end of the second-level measuring tube, the tertiary measuring tube is connected to the lower right end of the first ... right end of the first-level measuring tube, the tertiary measuring tube is connected to the lower right end of the first-level measuring tube, the tertiary measuring tube is connected to the lower right end of the first-level measuring tube, the tertiary measuring tube is connected to the lower right end of the first-level An air intake pipe three is connected to the lower right end of the interior, and the rear end of the air intake pipe three is opened at the lower right end of the third-level measuring tube; an air intake pipe four is opened at the upper left end of the interior of the fourth-level measuring tube, and the rear end of the air intake pipe four is opened at the upper left end of the fourth-level measuring tube; the lower ends of the interiors of the first-level measuring tube, the second-level measuring tube, the third-level measuring tube and the fourth-level measuring tube are all connected to drainage pipes, the upper ends of the interiors of the first-level measuring tube, the second-level measuring tube, the third-level measuring tube and the fourth-level measuring tube are all connected to grouting pipes, and the front and rear ends of the outer sides of the first-level measuring tube, the second-level measuring tube, the third-level measuring tube and the fourth-level measuring tube are all connected to bags.

[0007] Preferably, the measuring points on the first-level measuring tube, the second-level measuring tube, the third-level measuring tube and the fourth-level measuring tube are respectively connected to the air intake pipe one, the air intake pipe two, the air intake pipe three and the air intake pipe four, and the four measuring points are distributed in a ring. When installing the measuring tube body, the measuring tube body is first spliced, and then the measuring tube body can be placed into the pre-opened drilled hole. At this time, the first-level measuring tube, the second-level measuring tube, the third-level measuring tube and the fourth-level measuring tube can monitor the four measuring points respectively. The setting of the drainage pipe facilitates the discharge of moisture in the gas, and the setting of the grouting pipe and the bag facilitates the sealing between the measuring points.

[0008] Preferably, the rear end of the internal drainage pipe of the first-level measuring tube is opened at the bottom of the first-level measuring tube, and a branch is opened at the lower end of the internal drainage pipes of the second-level measuring tube, the third-level measuring tube and the fourth-level measuring tube, and the other end of the branch at the lower end of the internal drainage pipes of the second-level measuring tube, the third-level measuring tube and the fourth-level measuring tube is opened at the bottom of the second-level measuring tube, the third-level measuring tube and the fourth-level measuring tube respectively.

[0009] Preferably, the rear end of the grouting pipe inside the first-level measuring tube is opened on the rear side of the top of the first-level measuring tube, a branch is opened at the front end of the top of the grouting pipe inside the first-level measuring tube, the branch at the front end of the grouting pipe inside the first-level measuring tube is opened on the front side of the top of the first-level measuring tube, and the grouting pipe inside the first-level measuring tube is connected to the bag.

[0010] Preferably, a branch is opened at both ends of the front and rear grouting pipes inside the secondary measuring tube, the tertiary measuring tube and the quaternary measuring tube, and the other ends of the two branches of the front and rear grouting pipes inside the secondary measuring tube, the tertiary measuring tube and the quaternary measuring tube are opened at the top of the secondary measuring tube, the tertiary measuring tube and the quaternary measuring tube respectively, and the grouting pipe is connected to the bag.

[0011] Preferably, the lower left end of the interior of the secondary measuring tube is connected to connecting tube 1, the lower left end of the interior of the tertiary measuring tube is connected to connecting tube 2, and the lower left end of the interior of the quaternary measuring tube is connected to connecting tube 3, and the intake pipe 1, connecting tube 1, connecting tube 2 and connecting tube 3 match each other.

[0012] Preferably, a connecting tube four is opened at the upper right end of the interior of the three-stage measuring tube, a connecting tube five is opened at the upper right end of the interior of the four-stage measuring tube, and a connecting tube six is ​​opened at the lower right end of the interior of the four-stage measuring tube. Inlet pipe two, connecting tube four and connecting tube five match each other, and intake pipe three and connecting tube six match each other.

[0013] Preferably, a connecting pipe 1 is connected between the internal air inlet pipe 1 and the drain pipe of the first-level measuring tube, a connecting pipe 2 is connected between the internal connecting pipe 1, the drain pipe and the air inlet pipe 2 of the second-level measuring tube, a connecting pipe 3 is connected between the internal connecting pipe 2, the drain pipe, the air inlet pipe 3 and the connecting pipe 4 of the tertiary measuring tube, and a connecting pipe 4 is connected between the internal air inlet pipe 4, the connecting pipe 3, the drain pipe, the connecting pipe 6 and the connecting pipe 5 of the fourth-level measuring tube.

[0014] Preferably, an extension tube is included, which matches the first-level measuring tube, the second-level measuring tube, the third-level measuring tube and the fourth-level measuring tube, the head end, the first-level measuring tube, the second-level measuring tube, the third-level measuring tube, the fourth-level measuring tube and the inner front side of the extension tube are connected with a mounting block, a positioning groove is provided at the bottom of the mounting block, the first-level measuring tube, the second-level measuring tube, the third-level measuring tube, the fourth-level measuring tube, the tail end and the inner rear side of the extension tube are connected with a positioning block, and the positioning groove and the positioning block match each other.

[0015] Preferably, a sealing gasket is provided between the first-level measuring tube, the second-level measuring tube, the third-level measuring tube, the fourth-level measuring tube and the tail end.

[0016] Preferably, the head end, the first-level measuring tube, the second-level measuring tube, the third-level measuring tube, the fourth-level measuring tube and the top front side of the extension tube are connected with buckles, and the first-level measuring tube, the second-level measuring tube, the third-level measuring tube, the fourth-level measuring tube, the tail end and the top rear side of the extension tube are provided with slots, and the buckles and the slots match each other.

[0017] The beneficial effects of the present invention are as follows: by arranging a first-level measuring tube, a second-level measuring tube, a third-level measuring tube, a fourth-level measuring tube, an intake pipe one, an intake pipe two, an intake pipe three and an intake pipe four, the measuring points on the first-level measuring tube, the second-level measuring tube, the third-level measuring tube and the fourth-level measuring tube are respectively connected to the intake pipe one, the intake pipe two, the intake pipe three and the intake pipe four, and the four measuring points are distributed in a ring shape. When installing the measuring tube body, the measuring tube body is first spliced, and then the measuring tube body can be placed into the pre-opened drilled hole. At this time, the first-level measuring tube, the second-level measuring tube, the third-level measuring tube and the fourth-level measuring tube can monitor the four measuring points respectively, avoiding multiple drilling construction and reducing the engineering workload and testing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Shown is a schematic diagram of the three-dimensional structure of a single-hole multi-measurement-point gas pressure monitoring device of the present invention; Figure 2 What is shown is a three-dimensional cross-sectional schematic diagram of a measuring tube body of a single-hole multi-measuring-point gas pressure monitoring device of the present invention; Figure 3 Shown is a three-dimensional cross-sectional schematic diagram of a measuring tube of a single-hole multi-measuring-point gas pressure monitoring device of the present invention; Figure 4 Shown is a schematic diagram of the three-dimensional structure of a measuring tube of a single-hole multi-measuring-point gas pressure monitoring device of the present invention; Figure 5 Shown is a schematic diagram of the three-dimensional structure of a measuring tube 2 of a single-hole multi-measuring-point gas pressure monitoring device of the present invention; Figure 6 Shown is a schematic diagram of the three-dimensional structure of a measuring tube of a single-hole multi-measurement-point gas pressure monitoring device of the present invention; Figure 7 Shown is a schematic diagram of the three-dimensional structure of a measuring tube of a single-hole multi-measurement-point gas pressure monitoring device of the present invention; Figure 8 Shown is a schematic diagram of the left side structure of a measuring tube of a single-hole multi-measuring-point gas pressure monitoring device of the present invention; Fig. 9 Shown is a schematic diagram of the left side structure of the measuring tube 2 of a single-hole multi-measuring-point gas pressure monitoring device of the present invention; Fig.10 Shown is a schematic diagram of the left side structure of the measuring tube 3 of a single-hole multi-measurement-point gas pressure monitoring device of the present invention; Fig.11 Shown is a schematic diagram of the left side structure of a measuring tube 4 of a single-hole multi-measuring-point gas pressure monitoring device of the present invention; Fig.12 Shown is a three-dimensional cross-sectional schematic diagram of a connecting pipe of a single-hole multi-measuring point gas pressure monitoring device of the present invention.

[0019] Explanation of the reference numerals: 1. Measuring tube body; 2. First-level measuring tube; 3. Second-level measuring tube; 4. Third-level measuring tube; 5. Fourth-level measuring tube; 6. Head end; 7. Tail end; 8. Extension tube; 9. Inlet pipe one; 10. Connecting pipe one; 11. Connecting pipe two; 12. Connecting pipe three; 13. Inlet pipe two; 14. Connecting pipe four; 15. Connecting pipe five; 16. Inlet pipe three; 17. Connecting pipe six; 18. Inlet pipe four; 19. Drain pipe; 20. Connecting pipe one; 21. Connecting pipe two; 22. Connecting pipe three; 23. Connecting pipe four; 24. Grouting pipe; 25. Bag; 26. Mounting block; 27. Positioning groove; 28. Positioning block; 29. ​​Sealing pad; 30. Buckle; 31. Slot. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] See also Figure 1-Figure 12 The present invention provides an embodiment: a single-hole multi-measurement-point gas pressure monitoring device, comprising a measuring tube body 1; the measuring tube body 1 comprises a first-level measuring tube 2, a second-level measuring tube 3, a third-level measuring tube 4 and a fourth-level measuring tube 5, a head end 6 is arranged at the rear side of the first-level measuring tube 2, a tail end 7 is arranged at the front side of the fourth-level measuring tube 5, an air intake pipe 1 9 is connected to the lower left end of the first-level measuring tube 2, a rear end of the air intake pipe 1 9 is opened at the lower left end of the first-level measuring tube 2, an air intake pipe 2 13 is connected to the upper right end of the second-level measuring tube 3, a rear end of the air intake pipe 2 13 is opened at the upper right end of the second-level measuring tube 3, an air intake pipe 3 16 is connected to the lower right end of the third-level measuring tube 4, a rear end of the air intake pipe 3 16 is opened at the lower right end of the third-level measuring tube 4, an air intake pipe 4 18 is opened at the upper left end of the fourth-level measuring tube 5, a rear end of the air intake pipe 4 18 is opened at the upper left end of the fourth-level measuring tube 5, the first-level measuring tube 2, the second-level measuring tube 3, the third-level measuring tube 4 The lower ends of the inner parts of the first-level measuring tube 2, the second-level measuring tube 3, the third-level measuring tube 4 and the fourth-level measuring tube 5 are connected with a drainage pipe 19, the upper ends of the inner parts of the first-level measuring tube 2, the second-level measuring tube 3, the third-level measuring tube 4 and the fourth-level measuring tube 5 are connected with a grouting pipe 24, the front and rear ends of the outer sides of the first-level measuring tube 2, the second-level measuring tube 3, the third-level measuring tube 4 and the fourth-level measuring tube 5 are connected with a bag 25, the measuring points on the first-level measuring tube 2, the second-level measuring tube 3, the third-level measuring tube 4 and the fourth-level measuring tube 5 are respectively connected with an intake pipe 1 9, an intake pipe 2 13, an intake pipe 3 16 and an intake pipe 4 18, and the four measuring points are distributed in a ring shape. When installing the measuring tube body 1, the measuring tube body 1 is first spliced, and then the measuring tube body 1 can be placed into the pre-opened drilled hole. At this time, the first-level measuring tube 2, the second-level measuring tube 3, the third-level measuring tube 4 and the fourth-level measuring tube 5 can monitor the four measuring points respectively, wherein the setting of the drainage pipe 19 facilitates the discharge of moisture in the gas, and the setting of the grouting pipe 24 and the bag 25 facilitates the sealing between the measuring points.

[0022] See also Figure 4-Figure 11 In this embodiment, the rear end of the internal drainage pipe 19 of the first-level measuring tube 2 is opened at the bottom of the first-level measuring tube 2, and a branch is opened at the lower end of the internal drainage pipe 19 of the second-level measuring tube 3, the third-level measuring tube 4 and the fourth-level measuring tube 5. The other ends of the lower branches of the internal drainage pipes 19 of the second-level measuring tube 3, the third-level measuring tube 4 and the fourth-level measuring tube 5 are respectively opened at the bottom of the second-level measuring tube 3, the third-level measuring tube 4 and the fourth-level measuring tube 5. The opening of the drainage pipe 19 facilitates the discharge of moisture in the gas.

[0023] See also Figure 4-Figure 11 In this embodiment, the rear end of the grouting pipe 24 inside the first-level measuring tube 2 is opened at the rear side of the top of the first-level measuring tube 2, a branch is opened at the top front end of the grouting pipe 24 inside the first-level measuring tube 2, the branch at the front end of the grouting pipe 24 inside the first-level measuring tube 2 is opened at the front side of the top of the first-level measuring tube 2, the grouting pipe 24 inside the first-level measuring tube 2 is communicated with the bag 25, the front and rear ends of the grouting pipes 24 inside the second-level measuring tube 3, the third-level measuring tube 4 and the fourth-level measuring tube 5 are all opened with a branch, the second-level measuring tube 3, the third-level measuring tube 4 and the fourth-level measuring tube 5 are all opened with a branch, The other ends of the front and rear branches of the grouting pipe 24 inside the tube 4 and the fourth-level measuring tube 5 are respectively opened at the top of the second-level measuring tube 3, the third-level measuring tube 4 and the fourth-level measuring tube 5. The grouting pipe 24 is communicated with the bag 25. The setting of the grouting pipe 24 is convenient for pressure sealing grouting operations. The slurry can be poured into the bag 25 through the grouting pipe 24. The bag 25 is expanded by the slurry pressure. The bag 25 can fit together with the wall at the punched hole, thereby playing a sealing role between each measuring point.

[0024] See also Figure 4-Figure 12In this embodiment, a connecting pipe 10 is connected to the lower left end of the inner part of the secondary measuring tube 3, a connecting pipe 2 11 is connected to the lower left end of the inner part of the tertiary measuring tube 4, a connecting pipe 3 12 is connected to the lower left end of the inner part of the quaternary measuring tube 5, an intake pipe 1 9, a connecting pipe 1 10, a connecting pipe 2 11 and a connecting pipe 3 12 match each other, a connecting pipe 4 14 is opened at the upper right end of the inner part of the tertiary measuring tube 4, a connecting pipe 5 15 is opened at the upper right end of the inner part of the quaternary measuring tube 5, a connecting pipe 6 17 is opened at the lower right end of the inner part of the quaternary measuring tube 5, an intake pipe 2 13, a connecting pipe 4 14 and a connecting pipe 5 15 match each other, an intake pipe 3 16 and a connecting pipe 6 17 match each other, a connecting pipe 20 is connected between the inner intake pipe 1 9 and the drain pipe 19 of the primary measuring tube 2, a connecting pipe 2 21 is connected between the inner connecting pipe 10, the drain pipe 19 and the intake pipe 2 13 of the secondary measuring tube 3, a connecting pipe 2 11 and a drain pipe 19 of the tertiary measuring tube 4 , a connecting pipe three 22 is connected between the air intake pipe three 16 and the connecting pipe four 14, a connecting pipe four 23 is connected between the internal air intake pipe four 18, the connecting pipe three 12, the drain pipe 19, the connecting pipe six 17 and the connecting pipe five 15 of the four-stage measuring tube 5, the gas at the measuring point on the first-stage measuring tube 2 can flow to the detection device through the air intake pipe one 9, the connecting pipe one 10, the connecting pipe two 11 and the connecting pipe three 12, the gas at the measuring point on the second-stage measuring tube 3 can flow to the detection device through the air intake pipe two 13, the connecting pipe four 14 and the connecting pipe five 15, the gas at the measuring point on the tertiary measuring tube 4 can flow to the detection device through the air intake pipe three 16 and the connecting pipe six 17, the gas at the measuring point on the fourth-stage measuring tube 5 can flow to the detection device through the air intake pipe four 18, wherein the moisture mixed in the gas can be affected by gravity and can flow to the drain pipe 19 through the connecting pipe one 20, the connecting pipe two 21, the connecting pipe three 22 or the connecting pipe four 23 for discharge.

[0025] See also Figure 1-Figure 3In this embodiment, an extension tube 8 is included, and the extension tube 8 matches with the primary measuring tube 2, the secondary measuring tube 3, the tertiary measuring tube 4 and the quaternary measuring tube 5. The front sides of the head end 6, the primary measuring tube 2, the secondary measuring tube 3, the tertiary measuring tube 4, the quaternary measuring tube 5 and the extension tube 8 are all connected with a mounting block 26. A positioning groove 27 is provided at the bottom of the mounting block 26. The rear sides of the primary measuring tube 2, the secondary measuring tube 3, the tertiary measuring tube 4, the quaternary measuring tube 5, the tail end 7 and the extension tube 8 are all connected with a positioning block 28. The positioning groove 27 matches with the positioning block 28. A sealing gasket 29 is provided between the primary measuring tube 2, the secondary measuring tube 3, the tertiary measuring tube 4, the quaternary measuring tube 5 and the tail end 7. The top front sides of the measuring tube 2, the secondary measuring tube 3, the tertiary measuring tube 4, the quaternary measuring tube 5 and the extension tube 8 are all connected with a buckle 30, and the top rear sides of the primary measuring tube 2, the secondary measuring tube 3, the tertiary measuring tube 4, the quaternary measuring tube 5, the tail end 7 and the extension tube 8 are all provided with a slot 31, and the buckle 30 and the slot 31 match each other. The setting of the extension tube 8 is convenient for adjusting the spacing between the primary measuring tube 2, the secondary measuring tube 3, the tertiary measuring tube 4 and the quaternary measuring tube 5 according to the spacing between the measuring points. The setting of the mounting block 26 and the positioning block 28 facilitates the positioning between the pipelines. The setting of the sealing gasket 29 can seal the pipeline joints, and the setting of the buckle 30 and the slot 31 can lock the pipelines.

[0026] When working, first drill a hole that meets the experimental conditions at the designated position, then determine the position of the measuring point according to the project requirements, and splice the measuring tube body 1 according to the position of the measuring point. During the splicing process, the pipelines can be positioned and connected by the mounting block 26 and the positioning block 28, the pipeline connection can be sealed by the sealing gasket 29, and the pipelines can be locked by the buckle 30 and the slot 31. After the splicing of the measuring tube body 1 is completed, the head end 6 on the measuring tube body 1 is facing the borehole, and the measuring tube body 1 is sent into the borehole. After the measuring tube body 1 is in place, the corresponding pressure sealing slurry is injected through the grouting pipe 24 according to the process, and the bag 25 is expanded by the slurry pressure, so that the bag 25 can fit with the side wall of the borehole, so that each measuring point can be sealed. After the sealing slurry solidifies, the multi-channel electronic pressure gauge can be installed to measure the pressure of the four measuring points respectively.

[0027] Through the above steps, by setting the first-level measuring tube 2, the second-level measuring tube 3, the third-level measuring tube 4, the fourth-level measuring tube 5, the air intake pipe 1 9, the air intake pipe 2 13, the air intake pipe 3 16 and the air intake pipe 4 18, the measuring points on the first-level measuring tube 2, the second-level measuring tube 3, the third-level measuring tube 4 and the fourth-level measuring tube 5 are respectively connected to the air intake pipe 1 9, the air intake pipe 2 13, the air intake pipe 3 16 and the air intake pipe 4 18, and the four measuring points are distributed in a ring. When installing the measuring tube body 1, the measuring tube body 1 is first spliced, and then the measuring tube body 1 can be placed into the pre-opened borehole. At this time, the first-level measuring tube 2, the second-level measuring tube 3, the third-level measuring tube 4, and the fourth-level measuring tube 5 can monitor the four measuring points respectively, avoiding multiple drilling constructions, reducing the engineering workload and testing costs, so as to solve the problem that the current coal seam gas pressure measurement is mainly one hole one pressure, and the segmented pressure measurement cannot be effectively realized. If multiple boreholes are to be constructed when the gas pressure of multiple coal seams is to be measured, multiple boreholes must be constructed, resulting in large construction workload and high testing costs.

Claims

1. A single-hole multi-measurement-point gas pressure monitoring device, comprising a measuring tube body (1); characterized in that: The measuring tube body (1) comprises a first-stage measuring tube (2), a second-stage measuring tube (3), a third-stage measuring tube (4) and a fourth-stage measuring tube (5). The first-stage measuring tube (2) is provided with a head end (6) at the rear side, and the fourth-stage measuring tube (5) is provided with a tail end (7) at the front side. The first-stage measuring tube (2) is connected to an air intake pipe (9) at the lower left end inside, and the rear end of the air intake pipe (9) is opened at the lower left end of the first-stage measuring tube (2). The second-stage measuring tube (3) is connected to an air intake pipe (13) at the upper right end inside, and the rear end of the air intake pipe (13) is opened at the upper right end of the second-stage measuring tube (3). The third-stage measuring tube (4) is connected to an air intake pipe (16) at the lower right end inside, and the air intake pipe (16) is opened at the upper right end of the third-stage measuring tube (4). The rear end of the first-level measuring tube (2), the second-level measuring tube (3), the third-level measuring tube (4) and the fourth-level measuring tube (5) is connected to a grouting pipe (24); the front and rear ends of the first-level measuring tube (2), the second-level measuring tube (3), the third-level measuring tube (4) and the fourth-level measuring tube (5) are connected to a grouting pipe (24); and the front and rear ends of the outer sides of the first-level measuring tube (2), the second-level measuring tube (3), the third-level measuring tube (4) and the fourth-level measuring tube (5) are connected to a bladder bag (25).

2. The single-hole multi-measurement-point gas pressure monitoring device according to claim 1 is characterized in that: The rear end of the internal drainage pipe (19) of the first-level measuring pipe (2) is opened at the bottom of the first-level measuring pipe (2), and the lower ends of the internal drainage pipes (19) of the second-level measuring pipe (3), the third-level measuring pipe (4) and the fourth-level measuring pipe (5) are each provided with a branch, and the other ends of the lower branches of the internal drainage pipes (19) of the second-level measuring pipe (3), the third-level measuring pipe (4) and the fourth-level measuring pipe (5) are respectively opened at the bottom of the second-level measuring pipe (3), the third-level measuring pipe (4) and the fourth-level measuring pipe (5).

3. The single-hole multi-measurement-point gas pressure monitoring device according to claim 1 is characterized in that: The rear end of the first-level measuring tube (2) internal grouting tube (24) is opened at the rear side of the top of the first-level measuring tube (2), the front end of the top of the first-level measuring tube (2) internal grouting tube (24) is provided with a branch, the front end branch of the first-level measuring tube (2) internal grouting tube (24) is opened at the front side of the top of the first-level measuring tube (2), and the first-level measuring tube (2) internal grouting tube (24) is communicated with the bag (25).

4. The single-hole multi-measurement-point gas pressure monitoring device according to claim 1 is characterized in that: A branch is provided at both the front and rear ends of the grouting pipe (24) inside the secondary measuring pipe (3), the tertiary measuring pipe (4) and the quaternary measuring pipe (5). The other ends of the front and rear branches of the grouting pipe (24) inside the secondary measuring pipe (3), the tertiary measuring pipe (4) and the quaternary measuring pipe (5) are respectively provided at the top of the secondary measuring pipe (3), the tertiary measuring pipe (4) and the quaternary measuring pipe (5). The grouting pipe (24) is in communication with the bag (25).

5. The single-hole multi-measurement-point gas pressure monitoring device according to claim 1 is characterized in that: The lower left end of the second-stage measuring tube (3) is connected to a connecting tube 1 (10), the lower left end of the third-stage measuring tube (4) is connected to a connecting tube 2 (11), the lower left end of the fourth-stage measuring tube (5) is connected to a connecting tube 3 (12), and the air inlet tube 1 (9), the connecting tube 1 (10), the connecting tube 2 (11) and the connecting tube 3 (12) are matched with each other.

6. The single-hole multi-measurement-point gas pressure monitoring device according to claim 1 is characterized in that: A connecting pipe 4 (14) is provided at the upper right end of the interior of the third-stage measuring tube (4), a connecting pipe 5 (15) is provided at the upper right end of the interior of the fourth-stage measuring tube (5), a connecting pipe 6 (17) is provided at the lower right end of the interior of the fourth-stage measuring tube (5), the air intake pipe 2 (13), the connecting pipe 4 (14) and the connecting pipe 5 (15) are matched with each other, and the air intake pipe 3 (16) and the connecting pipe 6 (17) are matched with each other.

7. The single-hole multi-measurement-point gas pressure monitoring device according to claim 1 is characterized in that: A connecting pipe 1 (20) is connected between the internal air inlet pipe 1 (9) and the drain pipe (19) of the first-stage measuring pipe (2); a connecting pipe 2 (21) is connected between the internal connecting pipe 1 (10), the drain pipe (19) and the air inlet pipe 2 (13) of the second-stage measuring pipe (3); a connecting pipe 3 (22) is connected between the internal connecting pipe 2 (11), the drain pipe (19), the air inlet pipe 3 (16) and the connecting pipe 4 (14) of the tertiary measuring pipe (4); and a connecting pipe 4 (23) is connected between the internal air inlet pipe 4 (18), the connecting pipe 3 (12), the drain pipe (19), the connecting pipe 6 (17) and the connecting pipe 5 (15) of the fourth-stage measuring pipe (5).

8. The single-hole multi-measurement-point gas pressure monitoring device according to claim 1 is characterized in that: The invention comprises an extension tube (8), the extension tube (8) matches with a primary measuring tube (2), a secondary measuring tube (3), a tertiary measuring tube (4) and a quaternary measuring tube (5), the head end (6), the primary measuring tube (2), the secondary measuring tube (3), the tertiary measuring tube (4), the quaternary measuring tube (5) and the extension tube (8) are connected to a mounting block (26) at the front side thereof, a positioning groove (27) is provided at the bottom of the mounting block (26), the primary measuring tube (2), the secondary measuring tube (3), the tertiary measuring tube (4), the quaternary measuring tube (5), the tail end (7) and the extension tube (8) are connected to a positioning block (28) at the rear side thereof, and the positioning groove (27) matches with the positioning block (28) at the rear side thereof.

9. The single-hole multi-measurement-point gas pressure monitoring device according to claim 1, characterized in that: A sealing gasket (29) is provided between the first-stage measuring tube (2), the second-stage measuring tube (3), the third-stage measuring tube (4), the fourth-stage measuring tube (5) and the tail end (7).

10. The single-hole multi-measurement-point gas pressure monitoring device according to claim 1, characterized in that: The top front sides of the head end (6), the first-level measuring tube (2), the second-level measuring tube (3), the third-level measuring tube (4), the fourth-level measuring tube (5) and the extension tube (8) are all connected with a buckle (30), and the top rear sides of the first-level measuring tube (2), the second-level measuring tube (3), the third-level measuring tube (4), the fourth-level measuring tube (5), the tail end (7) and the extension tube (8) are all provided with a clamping groove (31), and the buckle (30) and the clamping groove (31) are matched with each other.

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