CN106837308B - Gas tunnel pressure measuring device and method thereof - Google Patents
Gas tunnel pressure measuring device and method thereof Download PDFInfo
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- CN106837308B CN106837308B CN201710199119.XA CN201710199119A CN106837308B CN 106837308 B CN106837308 B CN 106837308B CN 201710199119 A CN201710199119 A CN 201710199119A CN 106837308 B CN106837308 B CN 106837308B
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000007789 sealing Methods 0.000 claims abstract description 105
- 239000002002 slurry Substances 0.000 claims abstract description 91
- 238000009530 blood pressure measurement Methods 0.000 claims abstract description 28
- 239000004568 cement Substances 0.000 claims abstract description 28
- 238000010276 construction Methods 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 229920001971 elastomer Polymers 0.000 claims abstract description 12
- 238000007689 inspection Methods 0.000 claims abstract description 9
- 238000002347 injection Methods 0.000 claims abstract description 8
- 239000007924 injection Substances 0.000 claims abstract description 8
- 238000009434 installation Methods 0.000 claims abstract description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 16
- 239000003245 coal Substances 0.000 claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 6
- 239000011435 rock Substances 0.000 claims description 5
- 238000005065 mining Methods 0.000 claims description 4
- 239000004746 geotextile Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 5
- 239000002699 waste material Substances 0.000 abstract description 4
- 229920006395 saturated elastomer Polymers 0.000 abstract 1
- 239000011440 grout Substances 0.000 description 9
- 230000000903 blocking effect Effects 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 238000007569 slipcasting Methods 0.000 description 3
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a gas tunnel pressure measuring device and a method thereof, and belongs to the technical field of gas tunnel construction. The device comprises a pressure measuring pipe, a hole sealing device, a grouting pump, a grouting pipe and a pressure gauge, wherein the hole sealing device comprises a hole sealing slurry bag, the hole sealing slurry bag is sleeved on the pressure measuring pipe, two ends of the hole sealing slurry bag are firmly bound by a binding belt, the front end of the hole sealing slurry bag is provided with the grouting pipe and an exhaust pipe, and the front side and the rear side of the hole sealing slurry bag are respectively provided with a rubber slurry stop plug; the grouting pipe is connected with a grouting pump; the front port of the pressure measuring pipe is connected with a three-way joint, one end of the three-way joint is connected with a pressure gauge, and the other end of the three-way joint is connected with a liquid injection inspection pump. The pressure measuring method has the advantages of simple and reliable structure, reasonable design, simple and convenient construction operation, high construction efficiency, high pressure measuring speed and accurate pressure measurement, and the hole sealing slurry bag is in a non-saturated state when in installation, so that the pressure measuring pipe is easy to install, the hole sealing slurry is sealed in the bag, the hole sealing effect is good, the cement slurry is not exposed, the cement slurry waste is reduced, and the cost is reduced.
Description
Technical Field
The invention relates to the technical field of gas tunnel construction.
Background
The pressure of the coal-bed gas is the most basic parameter of the flowing and the surging of the coal-bed gas, is one of the power of the coal-bed outburst, and has important significance for effectively and reasonably appointing gas prevention measures and predicting the risk of the gas outburst by accurately measuring the pressure of the coal-bed gas. When the tunnel construction process needs to pass through a gas stratum, in order to prevent disaster influence construction caused by gas outburst, advanced outburst prediction needs to be carried out on gas, indexes such as gas stratum pressure and the like are detected, a common method is to adopt an advanced probe hole, a pressure measuring pipe is arranged in the probe hole in order to prevent pressure relief, grouting hole sealing is adopted between the probe hole and the pressure measuring pipe, and yellow mud, cement, sealing liquid, grouting and the like are generally adopted. The hole sealing quality is an important factor for ensuring that the drilling hole accurately measures the gas pressure of the coal seam, and the pressure measuring mode has the following problems: (1) Due to the complexity of tunnel surrounding rock, the shape of the exploratory hole is irregular, a rubber grout stop plug is adopted, the sealing effect is poor, and the pressed cement grout can block the pressure measuring pipe through the rubber grout stop plug; (2) The length of the hole sealing mortar cannot be accurately sealed, and whether the hole sealing mortar meets the related standard requirement cannot be judged; (3) Because the air pressure exists in the exploratory hole, the grouting pressure is too small to be pressed into cement paste and can not be blocked quickly, and the grouting pressure is too large to push the piezometer tube to move forwards; (4) The grout stop is easy to rub against the hole wall to cause damage in the installation process, and the installation is complicated when the grout stop is oversized.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the gas tunnel pressure measuring device and the method thereof, wherein the pressure measuring device is simple and reliable in structure, reasonable in design, simple and convenient to construct and operate, high in construction efficiency, high in pressure measuring speed and accurate in pressure measurement, and the hole sealing slurry bag is in an unsaturated state when the pressure measuring method is installed, so that the pressure measuring pipe is easy to install, the hole sealing slurry is sealed in the bag, the hole sealing effect is good, cement slurry is not exposed, cement slurry waste is reduced, and the cost is reduced.
In order to solve the technical problems, the invention adopts the following technical scheme: a pressure measuring method for a gas tunnel,
(1) According to advanced geological forecast data, a pressure measuring hole with the diameter of 75mm and the hole depth of not less than 15m and not less than 5m deep into a coal seam is drilled on a rock face which is close to a tunnel face of a gas stratum tunnel and is not affected by artificial mining by adopting a down-the-hole drill;
(2) The pressure measuring pipe is sleeved with a hole sealing slurry bag, the inner diameter of the hole sealing slurry bag is 1.5-2.5 times of the diameter of the pressure measuring hole, and two ends of the hole sealing slurry bag are firmly bound by a binding belt so as to prevent slurry leakage, and a rubber slurry stopping plug is respectively arranged at the front side and the rear side of the pressure measuring pipe;
(3) After the construction of pressure measuring drilling is finished, installing a pressure measuring pipe in a pressure measuring hole at a preset hole sealing depth, installing a grouting pipe, and exposing the pressure measuring pipe for a certain length after the installation of the pressure measuring pipe;
(4) Adding a certain proportion of expanding agent and air-tight agent into cement slurry, preparing hole sealing slurry according to the proportion of water-cement ratio of 2:1, wherein the expanding agent is 12% and the air-tight agent is 8%, continuously injecting the cement slurry into a hole sealing slurry bag at one time by using a grouting pump until the grouting pressure reaches 0.5MPa, keeping the grouting pressure for 5 minutes, exhausting gas in the hole sealing slurry bag through an exhaust pipe, fully ensuring the compactness of the hole sealing slurry in the hole sealing slurry bag, and plugging an orifice by using an accelerator after grouting is finished;
(5) The pressure measuring pipe is detected by adopting a liquid injection inspection pump, so that the smoothness of the pressure measuring pipe is ensured;
(6) And (3) installing a pressure gauge after the hole sealing slurry is solidified for 24 hours, observing and recording the change of the gauge value until the reading tends to be stable, and ending the pressure measuring work until the gauge pressure value is stable for 5-7 d, wherein the change of the gas pressure is less than 0.005 MPa/d.
The utility model provides a gas tunnel pressure measurement device, includes the piezometer tube, hole sealing device, slip casting pump, slip casting pipe and manometer, and hole sealing device includes hole sealing thick liquid bag, and hole sealing thick liquid bag cover is on the piezometer tube and both ends are firmly banded with the ligature area, and the front end of hole sealing thick liquid bag is provided with slip casting pipe and blast pipe, and both sides are provided with a rubber and stop the thick liquid stopper respectively around it; the grouting pipe is connected with a grouting pump; the front port of the pressure measuring pipe is connected with a three-way joint, one end of the three-way joint is connected with a pressure gauge, and the other end of the three-way joint is connected with a liquid injection inspection pump.
Preferably, the hole sealing slurry bag is made of geotextile.
Preferably, the effective length of the hole sealing slurry bag is 10-20 m.
Preferably, the binding band is a binding wire or rope.
Preferably, the pressure measuring pipe is formed by threaded connection of an iron pipe with the diameter of 15mm, a sieve pore pipe is arranged at the air inlet end, and an air inlet hole is formed in the sieve pore pipe.
Preferably, the exposed length of the piezometer tube is 150-350 mm.
Preferably, the measuring range of the pressure gauge is 1.5 times of the expected coalbed methane pressure.
Preferably, the hole sealing slurry bag is cylindrical.
Preferably, the hole sealing slurry bag can bear the pressure of not less than 2 MPa.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in: the invention provides a gas tunnel pressure measuring device and a method thereof, the pressure measuring device has the advantages of simple and reliable structure, reasonable design, simple construction operation, high construction efficiency, high pressure measuring speed and accurate pressure measurement, and the hole sealing slurry bag is in an unsaturated state when in installation, a pressure measuring pipe is easy to install, hole sealing slurry is sealed in the bag, the hole sealing effect is good, cement slurry is not exposed, cement slurry waste is reduced, the cost is reduced, grouting materials can uniformly fill the whole space and tightly combine with the wall of a hole sealing material and the wall of the hole sealing hole, the sealing along the coal seam is realized, the cement slurry infiltration caused by poor sealing property is avoided, and the permeated cement slurry is prevented from blocking the air inlet hole of the pressure measuring pipe, thereby improving the success rate and accuracy of gas pressure measurement, leading the measured gas pressure value to be closer to the real gas pressure of the coal seam, effectively predicting the gas outburst, improving the sealing property of the pressure measurement, improving the working efficiency of the pressure measurement and widely popularizing prospect.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
in the figure: 1. a pressure measuring tube; 2. rubber grout stop; 3. binding bands; 4. an exhaust pipe; 5. sealing the hole slurry bag; 6. grouting pipe; 7. a grouting pump; 8. a pressure gauge; 9. a three-way joint; 10. a liquid injection inspection pump; 11. a coal seam; 12. a screen hole pipe; 13. an air inlet hole.
Detailed Description
The invention will be described in further detail with reference to the drawings and the detailed description.
Example 1
A pressure measuring method for a gas tunnel,
(1) According to advanced geological forecast data, a pressure measuring hole with the diameter of 75mm and the hole depth of not less than 15m and not less than 5m deep into a coal seam is drilled on a rock face which is close to a tunnel face of a gas stratum tunnel and is not affected by artificial mining by adopting a down-the-hole drill;
(2) The pressure measuring tube 1 is sleeved with a hole sealing slurry bag 5, the inner diameter of the hole sealing slurry bag is 1.5-2.5 times of the diameter of the pressure measuring hole, and two ends of the hole sealing slurry bag are firmly bound by a binding belt 3 so as to prevent slurry leakage, and the front side and the rear side of the pressure measuring tube 1 are respectively provided with a rubber slurry stop plug 2;
(3) After the pressure measurement drilling construction is finished, installing the pressure measurement pipe 1 in a pressure measurement hole at a preset hole sealing depth, installing the grouting pipe 6, and exposing the pressure measurement pipe 1 for a certain length after the pressure measurement pipe 1 is installed;
(4) Adding a certain proportion of expanding agent and air-tight agent into cement slurry, preparing hole sealing slurry according to the proportion of water-cement ratio of 2:1, wherein the expanding agent is 12% and the air-tight agent is 8%, continuously injecting the cement slurry into the hole sealing slurry bag 5 at one time by using a grouting pump 7 until the grouting pressure reaches 0.5MPa, holding the pressure for 5 minutes, exhausting gas in the hole sealing slurry bag 5 through an exhaust pipe 4, fully ensuring the compactness of the hole sealing slurry in the hole sealing slurry bag 5, and plugging an orifice by using an accelerator after grouting is finished;
(5) The piezometer tube 1 is detected by adopting the liquid injection inspection pump 10, so that the smoothness of the piezometer tube 1 is ensured;
(6) And (3) installing a pressure gauge 8 after the hole sealing slurry is solidified for 24 hours, observing and recording the change of the gauge value until the reading tends to be stable, and ending the pressure measuring work until the gauge pressure value is stable for 5-7 d, wherein the change of the gas pressure is less than 0.005 MPa/d.
The utility model provides a gas tunnel pressure measuring device, includes pressure measuring pipe 1, hole sealing device, grouting pump 7, grouting pipe 6 and manometer 8, and pressure measuring pipe 1 adopts the iron pipe threaded connection that diameter is 15mm to form, and the inlet end is provided with screen hole pipe 12, is provided with inlet port 13 on it; the hole sealing device comprises a cylindrical hole sealing slurry bag 5 made of geotextile, wherein the effective length of the hole sealing slurry bag 5 is 15m, the hole sealing slurry bag is sleeved on a pressure measuring pipe 1, two ends of the hole sealing slurry bag are firmly bound by a binding belt 3, the front end of the hole sealing slurry bag 5 is provided with a grouting pipe 6 and an exhaust pipe 4, and the front side and the rear side of the hole sealing slurry bag are respectively provided with a rubber slurry stop plug 2; the grouting pipe 6 is connected with a grouting pump 7; the front end port of the pressure measuring pipe 1 is connected with a three-way joint 9, one end of the three-way joint 9 is connected with a pressure gauge 8, and the other end is connected with a liquid injection inspection pump 10.
When in pressure measurement, a pressure measurement hole with the diameter of 75mm and the hole depth of not less than 15m and deeper into a coal seam is firstly drilled on a rock surface which is not affected by artificial mining and is close to the tunnel face of a gas stratum tunnel, after the pressure measurement drilling construction is finished, an active pressure measurement pipe 1 is arranged at a preset hole sealing depth in the drilling hole, a grouting pipe 6 is arranged, a rubber grout stop plug 2 is arranged at the front end and the rear end of the pressure measurement pipe 1 respectively, the rubber grout stop plug 2 is used for positioning the pressure measurement pipe and preventing the hole sealing grout bag 5 from being broken to cause the blocking of an air inlet hole 13, the pressure measurement pipe 1 is arranged at the preset hole sealing depth in the pressure measurement hole, in order to prevent cracks from being generated due to shrinkage after cement paste is solidified, a certain proportion of expanding agent and air-tight agent are added into cement paste according to the hole sealing depth, hole sealing slurry is prepared according to the proportion of 12% of the expanding agent to 8% of the air-tight agent in a water cement ratio of 2:1, a grouting pump 7 is used for continuously injecting the cement paste into a hole sealing slurry bag 5 at one time until the grouting pressure reaches 0.5MPa for 5 minutes, gas in the hole sealing slurry bag 5 is discharged through an exhaust pipe 4, the compactness of the hole sealing slurry in the hole sealing slurry bag 5 is fully ensured, an accelerator is used for sealing an orifice after grouting is finished, a grouting inspection pump 10 is used for detecting a pressure measuring pipe 1, and the smoothness of the pressure measuring pipe 1 is ensured; and (3) installing a pressure gauge 8 after the hole sealing slurry is solidified for 24 hours, observing and recording the change of the gauge value until the reading tends to be stable, and ending the pressure measuring work until the gauge pressure value is stable for 5-7 d, wherein the change of the gas pressure is less than 0.005 MPa/d.
The invention provides a gas tunnel pressure measuring device and a method thereof, the pressure measuring device has the advantages of simple and reliable structure, reasonable design, simple construction operation, high construction efficiency, high pressure measuring speed and accurate pressure measurement, and the hole sealing slurry bag is in an unsaturated state when in installation, a pressure measuring pipe is easy to install, hole sealing slurry is sealed in the bag, the hole sealing effect is good, cement slurry is not exposed, the waste of cement slurry is reduced, the cost is reduced, grouting materials can uniformly fill the whole space and tightly combine with the wall of a hole sealing material, the hole sealing is not blocked, the sealing along the hole of the coal seam is realized, the cement slurry infiltration caused by poor sealing property is avoided, the penetrated cement slurry is prevented from blocking the hole sealing hole of the pressure measuring pipe, thereby improving the success rate and accuracy of gas pressure measurement, leading the measured gas pressure value to be closer to the real gas pressure of the coal seam, effectively predicting the gas projection, improving the tightness of the pressure measurement, and improving the working efficiency of the pressure measurement, and having wide popularization prospect.
The foregoing description of the disclosed embodiments will so enable one skilled in the art to make or use the invention, and many modifications of this embodiment will be readily apparent to those skilled in the art from the description, to devise other arrangements of the products which, although still within the spirit and scope of this invention, are not intended to be limited to the embodiments shown herein but are to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A gas tunnel pressure measuring method is characterized in that:
(1) According to advanced geological forecast data, a pressure measuring hole with the diameter of 75mm and the hole depth of not less than 15m and not less than 5m deep into a coal seam is drilled on a rock face which is close to a tunnel face of a gas stratum tunnel and is not affected by artificial mining by adopting a down-the-hole drill;
(2) The pressure measuring tube (1) is sleeved with a hole sealing slurry bag (5), the inner diameter of the hole sealing slurry bag is 1.5-2.5 times of the diameter of the pressure measuring hole, two ends of the hole sealing slurry bag are firmly bound by a binding belt (3) so as to prevent slurry leakage, and a rubber slurry stop plug (2) is respectively arranged at the front side and the rear side of the pressure measuring tube (1);
(3) After the pressure measurement drilling construction is finished, installing the pressure measurement pipe (1) in a pressure measurement hole at a preset hole sealing depth, installing the grouting pipe (6), and exposing the pressure measurement pipe (1) for a certain length after the installation;
(4) Adding a certain proportion of expanding agent and air sealing agent into cement slurry, preparing hole sealing slurry according to the proportion of water-cement ratio of 2:1, wherein the expanding agent is 12% and the air sealing agent is 8%, continuously injecting the cement slurry into a hole sealing slurry bag (5) at one time by using a grouting pump until the grouting pressure reaches 0.5MPa, holding the pressure for 5 minutes, exhausting gas in the hole sealing slurry bag (5) through an exhaust pipe (4), fully ensuring the compactness of the hole sealing slurry in the hole sealing slurry bag (5), and plugging an orifice by using an accelerator after grouting is finished;
(5) The pressure measuring tube (1) is detected by adopting a liquid injection inspection pump (10), so that the smoothness of the pressure measuring tube (1) is ensured;
(6) Installing a pressure gauge (8) after the hole sealing slurry is solidified for 24 hours, observing and recording the change of the gauge value until the reading tends to be stable, and ending the pressure measuring work until the gauge pressure value is stable for 5-7 d, wherein the change of the gas pressure is less than 0.005 MPa/d;
the pressure measuring pipe (1) is formed by threaded connection of iron pipes with diameters of 15mm, a screen hole pipe (12) is arranged at the air inlet end, and an air inlet hole (13) is formed in the air inlet end.
2. The gas tunnel pressure measuring device for realizing the gas tunnel pressure measuring method according to claim 1 comprises a pressure measuring pipe (1), a hole sealing device, a grouting pump (7), a grouting pipe (6) and a pressure gauge (8), and is characterized in that the hole sealing device comprises a hole sealing slurry bag (5), the hole sealing slurry bag (5) is sleeved on the pressure measuring pipe (1) and the two ends of the hole sealing slurry bag are firmly bound by binding belts (3), the front end of the hole sealing slurry bag (5) is provided with the grouting pipe (6) and an exhaust pipe (4), and the front side and the rear side of the hole sealing slurry bag are respectively provided with a rubber slurry stop plug (2); the grouting pipe (6) is connected with a grouting pump (7); the front port of the pressure measuring pipe (1) is connected with a three-way joint (9), one end of the three-way joint (9) is connected with a pressure gauge (8), and the other end of the three-way joint is connected with a liquid injection inspection pump (10).
3. The gas tunnel pressure measuring device according to claim 2, wherein the hole sealing slurry bag (5) is made of geotextile.
4. The gas tunnel pressure measuring device according to claim 2, wherein the effective length of the hole sealing slurry bag (5) is 10-20 m.
5. A gas tunnel pressure measuring device according to claim 2, characterized in that the tie-down strap (3) is a tie-down wire or rope.
6. A gas tunnel pressure measuring device according to claim 2, wherein the exposed length of the pressure measuring tube (1) is 150-350 mm.
7. A gas tunnel pressure measuring device according to claim 2, characterized in that the measuring range of the pressure gauge (8) is 1.5 times the expected coalbed gas pressure.
8. A gas tunnel pressure measuring device according to claim 2, characterized in that the hole sealing pulp bag (5) is cylindrical.
9. A gas tunnel pressure measuring device according to claim 2, characterized in that the sealing pulp bag (5) can withstand a pressure of not less than 2 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710199119.XA CN106837308B (en) | 2017-03-29 | 2017-03-29 | Gas tunnel pressure measuring device and method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710199119.XA CN106837308B (en) | 2017-03-29 | 2017-03-29 | Gas tunnel pressure measuring device and method thereof |
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| CN106837308A CN106837308A (en) | 2017-06-13 |
| CN106837308B true CN106837308B (en) | 2024-01-12 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107795315A (en) * | 2017-12-06 | 2018-03-13 | 中煤第建设有限公司 | Determination of coal seam gas pressure device and its method for measuring gas pressure of coal bed under the participation of coal mine shaft lining pit shaft hydraulic pressure |
| CN110159226A (en) * | 2019-06-19 | 2019-08-23 | 贵州盘江精煤股份有限公司 | A kind of gas control provided pipe fast plugging device |
| CN111879477B (en) * | 2020-07-30 | 2022-07-19 | 陕西煤业化工技术研究院有限责任公司 | System and method for inspecting sealing effect of roadway spraying |
| CN112282790A (en) * | 2020-09-16 | 2021-01-29 | 贵州大学 | Slurry stirring self-injection equipment |
| CN112282791B (en) * | 2020-09-16 | 2022-11-29 | 贵州大学 | Quick grouting system for soil body tunnel |
| CN113107469B (en) * | 2021-05-06 | 2023-11-17 | 中煤科工集团西安研究院有限公司 | Device and method for measuring gas pressure through underground long drilling |
| CN113107471B (en) * | 2021-05-14 | 2023-02-28 | 中国矿业大学 | System and method for testing stress distribution characteristics before mining based on capsule pressure change |
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|---|---|---|---|---|
| CN101845944A (en) * | 2010-05-08 | 2010-09-29 | 中国矿业大学 | Method for sealing gas drainage boreholes at specified positions |
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| CN106837308A (en) | 2017-06-13 |
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