CN220015139U - Multi-coal-bed tunnel gas permeation prevention structure - Google Patents
Multi-coal-bed tunnel gas permeation prevention structure Download PDFInfo
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- CN220015139U CN220015139U CN202321457896.7U CN202321457896U CN220015139U CN 220015139 U CN220015139 U CN 220015139U CN 202321457896 U CN202321457896 U CN 202321457896U CN 220015139 U CN220015139 U CN 220015139U
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- drill bit
- ring body
- gas
- gas permeation
- permeation prevention
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- 230000002265 prevention Effects 0.000 title claims abstract description 16
- 239000003245 coal Substances 0.000 claims abstract description 36
- 238000005553 drilling Methods 0.000 claims abstract description 36
- 238000007789 sealing Methods 0.000 claims description 9
- 239000013013 elastic material Substances 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 3
- 230000001737 promoting effect Effects 0.000 claims description 2
- 230000029058 respiratory gaseous exchange Effects 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 description 12
- 238000000605 extraction Methods 0.000 description 9
- 230000006872 improvement Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- Earth Drilling (AREA)
Abstract
The utility model relates to the technical field of tunnel gas permeation prevention, in particular to a multi-coal-bed tunnel gas permeation prevention structure. Including the cover ring body, the outer wall fixedly connected with bracing piece of cover ring body, the breathing pipe is installed to the tip of fan, and the inside of the lantern ring body is equipped with the drill bit, and the surface of drill bit has cup jointed protection component, and protection component's tip passes through sliding component and links to each other with the drill bit. According to the utility model, the drill bit can be used for telescopic drilling by using the cylinder arranged in the sleeve ring body and the piston rod sliding in the cylinder, the protection component can be arranged on the surface of the drill bit by using the sliding component, so that the outside of the drill bit can be protected, after the drill bit stretches into a coal seam, gas can float in the sleeve ring body through the drilling, the support rod can assist the fan to be arranged on the surface of the sleeve ring body, and the gas in the sleeve ring body can be discharged by using the fan and the air suction pipe arranged in the fan.
Description
Technical Field
The utility model relates to the technical field of tunnel gas permeation prevention, in particular to a multi-coal-bed tunnel gas permeation prevention structure.
Background
In the daily driving process of people, most roads are built into a straight line state as much as possible, so that a tunnel cannot be avoided in the building process, tunnel engineering is an important step of road building, however, coal seams are often encountered during tunnel mining, a large amount of gas is contained in the coal seams, the gas has certain permeability, once the gas permeates from the coal seams and is easy to explode, and human bodies are sucked into the human bodies to cause damage to body functions, so that at present, more engineering adopts a tunnel gas permeation prevention structure to assist in extracting gas in the coal seams;
the Chinese patent publication number is as follows: a multi-coal-seam tunnel gas permeation prevention structure of CN218862664U, which comprises a supporting plate and a lantern ring; the support plate is used for supporting the structural element and is provided with a rotary driving assembly, a drilling and punching assembly and a gas extraction assembly; wherein, rotary drive assembly includes: the device comprises a turntable, a rotating seat, a rack, a driving groove, a rotary driver, a transmission shaft and a driving gear; the utility model relates to the technical field of tunnel engineering, which has the following beneficial effects: according to the scheme, the lantern ring is tightly attached to the wall surface, and the exhaust pipe extends into the lantern ring, so that the exhaust pipe does not need to be inserted into a coal seam, and the device is more convenient to install and detach; the automatic drilling can be realized through the drilling and punching assembly and the rotary driving assembly, gas gathers in the hole after punching, then the hole can be extracted through the gas extraction assembly, and the gas can be prevented more conveniently by combining the drilling and extraction functions;
when gas in a coal seam needs to be extracted, the lantern ring is attached to the wall, the air cylinder is started to drive the drill bit to drill holes, at the moment, gas flows into the holes, then the exhaust pipe stretches into the lantern ring to extract the gas, so that the condition of gas permeation can be effectively reduced, in order to reduce gas leakage, the lantern ring needs to be attached to the wall, therefore, scraps generated by drilling can fall into the lantern ring, the exhaust pipe stretches into the lantern ring to carry out air extraction, and in the air extraction process, the scraps are easily driven to be extracted together, on one hand, the pollution of the gas is easily caused, on the other hand, the blockage of the exhaust pipe is easily caused, and the gas extraction efficiency is affected to a certain extent.
Disclosure of Invention
The utility model aims to solve the defects and provide the multi-coal-bed tunnel gas permeation prevention structure which can lead the drill bit to perform omnibearing check blocking through the sliding component arranged on the surface of the drill bit and the protective component arranged in the sliding component, thereby effectively reducing the waste dust extraction during the gas extraction of the gas suction pipe.
Through setting up the slip subassembly and the inside protective component that is equipped with of slip subassembly on the drill bit surface for the drill bit can carry out all-round check and keep off, effectually reduced the breathing pipe when taking out gas, taken out the condition of sweeps together, utilized the inclined plane that sets up at the middle pad inner wall simultaneously, and the inclined plane is slope to solid fixed ring direction, and the sweeps that produces when can assisting the drilling on the one hand slides, on the other hand makes the sweeps deposit in depositing the storehouse that forms between inclined plane and solid fixed ring.
The utility model provides a multi-coal-seam tunnel gas permeation prevention structure, which comprises a sleeve body, wherein the outer wall of the sleeve body is fixedly connected with a supporting rod, the supporting rod is used for assisting a fan to be installed on the surface of the sleeve body, the end part of the fan is provided with an air suction pipe, one end of the air suction pipe stretches into the sleeve body, a drill bit is arranged in the sleeve body, the stretching-in operation of the drill bit is realized by adopting a cylinder, a piston rod is arranged in the cylinder in a sliding manner, the other end of the piston rod is connected with the end part of the drill bit, and a sealing sucker is arranged at the opening part of the sleeve body;
the surface of drill bit has cup jointed the protection subassembly, the protection subassembly is used for carrying out the check to the surface of drill bit and keeps off, the tip of protection subassembly links to each other with the drill bit through sliding component, sliding component is used for promoting the protection effect of protection subassembly to the drill bit.
As a further improvement of this technical scheme, the protection subassembly is including being located the solid fixed ring on drill bit surface, gu fixed ring keeps away from the one end fixedly connected with check baffle of piston rod, and the drill bit is located the inside of check baffle for carry out check to the periphery of drill bit and keep off the protection.
As a further improvement of the technical scheme, the sliding assembly comprises a groove formed in the surface of the drill bit, the fixing ring slides in the groove, one side, close to the piston rod, of the fixing ring is connected with an elastic piece, and the other end of the elastic piece is fixedly connected with the inner wall of the groove.
As a further improvement of the technical scheme, the grid baffle consists of a middle pad and a fixing piece, one end of the middle pad is connected with the surface of the fixing ring, the other end of the middle pad is connected with the end part of the fixing piece, the middle pad is made of elastic materials, and a plurality of through holes are formed in the surface of the fixing piece and used for assisting gas circulation.
As a further improvement of the technical scheme, the inner wall of the middle pad is provided with an inclined surface inclined towards the direction of the fixed ring, a storage bin for storing scraps can be formed between the inclined surface and the fixed ring, and the inclined surface is used for assisting in flowing scraps generated by drilling.
Compared with the prior art, the utility model has the beneficial effects that:
in this many coal seam tunnel gas permeation prevention structure, through utilizing the sealed sucking disc that sets up in the lantern ring body opening part, can make the annular body of cover seal fit at the inner wall in tunnel, the infiltration of effectual reduction gas, utilize the cylinder that sets up in annular body inside and the inside gliding piston rod of cylinder, make the drill bit can carry out flexible drilling, utilize the slip subassembly that sets up on the drill bit surface, make the surface at the drill bit of protection subassembly accessible slip subassembly installation, make the outside of drill bit can protect, the effectual sweeps that produce when having reduced drilling scatter the condition inside annular body of cover, after the drill bit stretches into the coal seam inside, gas accessible drilling floats in the inside of the lantern ring body, utilize the bracing piece, can assist the fan to install on annular body of cover surface, utilize the fan and the breathing pipe that is equipped with in the fan, can carry out the discharge to the gas of the annular body inside.
Drawings
The utility model is described in more detail below, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of the overall structure of the present utility model;
FIG. 2 is a schematic view of the internal structure of the collar body of the present utility model;
FIG. 3 is a schematic view of a drill bit tensile structure according to the present utility model;
FIG. 4 is a schematic view of an exploded construction of a lattice baffle according to the present utility model;
fig. 5 is a schematic view of the overall cut-away structure of the present utility model.
The meaning of each reference sign in the figure is:
1. a ferrule body; 11. sealing the sucker; 12. a support rod; 13. a blower; 14. an air suction pipe; 15. a cylinder; 16. a piston rod; 17. a drill bit;
2. a protective assembly; 21. a fixing ring; 22. a grid baffle; 221. a middle pad; 222. a fixing member; 23. an inclined surface;
3. a sliding assembly; 31. a groove; 32. an elastic member;
4. and a through hole.
Detailed Description
When gas in the coal seam needs to be extracted, the lantern ring is attached to the wall, the air cylinder is started to drive the drill bit to drill holes, at the moment, gas flows into the holes, then the exhaust pipe stretches into the lantern ring to extract the gas, the condition of gas permeation can be effectively reduced, in order to reduce gas leakage, the lantern ring needs to be attached to the wall, therefore, scraps produced by drilling fall into the lantern ring, the exhaust pipe stretches into the lantern ring to exhaust air, and in the process of exhausting air, the scraps are easily driven to be exhausted together, on one hand, the pollution of the gas is easily caused, on the other hand, the blockage of the exhaust pipe is easily caused, and the extraction efficiency of the gas is affected to a certain extent.
Referring to fig. 1-5, the device comprises a sleeve body 1, a supporting rod 12 is fixedly connected to the outer wall of the sleeve body 1, the supporting rod 12 is used for assisting a fan 13 to be installed on the surface of the sleeve body 1, an air suction pipe 14 is installed at the end part of the fan 13, one end of the air suction pipe 14 stretches into the sleeve body 1, a drill bit 17 is arranged in the sleeve body 1, the stretching operation of the drill bit 17 is realized by adopting an air cylinder 15, a piston rod 16 is arranged in the air cylinder 15 in a sliding manner, the other end of the piston rod 16 is connected with the end part of the drill bit 17, a sealing sucker 11 is arranged at the opening of the sleeve body 1, a protection component 2 is sleeved on the surface of the drill bit 17, the protection component 2 is used for blocking the surface of the drill bit 17, the end part of the protection component 2 is connected with the drill bit 17 through a sliding component 3, and the sliding component 3 is used for improving the protection effect of the protection component 2 on the drill bit 17. The sealing sucker 11 arranged at the opening of the sleeve ring body 1 is utilized, the sleeve ring body 1 can be tightly attached to the inner wall of a tunnel, the permeation of gas is effectively reduced, the drill bit 17 can be used for telescopic drilling by utilizing the air cylinder 15 arranged in the sleeve ring body 1 and the piston rod 16 sliding in the air cylinder 15, the sliding component 3 arranged on the surface of the drill bit 17 is utilized, the protecting component 2 can be arranged on the surface of the drill bit 17 through the sliding component 3, the outside of the drill bit 17 can be protected, the situation that waste scraps generated during drilling are scattered in the sleeve ring body 1 is effectively reduced, after the drill bit 17 stretches into a coal seam, the gas can float in the sleeve ring body 1 through the drilling, the supporting rod 12 is utilized, the fan 13 can be assisted to be arranged on the surface of the sleeve ring body 1, and the gas in the sleeve ring body 1 can be discharged by utilizing the air suction pipe 14 arranged in the fan 13 and the fan 13.
Firstly, a specific structure of the protection assembly 2 is disclosed, the protection assembly 2 comprises a fixing ring 21 positioned on the surface of a drill bit 17, one end, far away from a piston rod 16, of the fixing ring 21 is fixedly connected with a grid baffle 22, and the drill bit 17 is positioned in the grid baffle 22 and used for conducting grid baffle protection on the periphery of the drill bit 17. By utilizing the fixed ring 21 arranged on the surface of the drill bit 17 and the grid baffle 22 fixedly connected with the end part of the fixed ring 21, the drill bit 17 can be positioned in the grid baffle 22, and when the drill bit 17 drills the coal seam and the coal seam surface, the waste scraps generated by drilling can be stored in the grid baffle 22, so that the situation that the waste scraps drift in the collar body 1 and are extracted together with gas can be reduced.
Secondly, a specific structure of the sliding component 3 is disclosed, the sliding component 3 comprises a groove 31 formed in the surface of the drill bit 17, the fixed ring 21 slides in the groove 31, one side, close to the piston rod 16, of the fixed ring 21 is connected with an elastic piece 32, and the other end of the elastic piece 32 is fixedly connected with the inner wall of the groove 31. When the cylinder 15 and the piston rod 16 drive the drill bit 17 to extend into the coal seam for drilling, the end part of the grid baffle 22 is attached to the surface of the coal seam, the drill bit 17 extends into the coal seam, the grid baffle 22 and the fixed ring 21 can be extruded, the fixed ring 21 can slide in the groove 31, when the drill bit 17 is pulled out under the driving of the cylinder 15, the elastic piece 32 between the fixed ring 21 and the inner wall of the groove 31 loses pressure rebound, the fixed ring 21 is driven to slide to the original position, the drill bit 17 can be always positioned in the grid baffle 22, and therefore the condition that drilling scraps fly out is further reduced.
The purpose of the elastic member 32 is mainly: when the drill bit 17 is pulled out under the driving of the air cylinder 15, the elastic piece 32 positioned between the fixed ring 21 and the inner wall of the groove 31 loses pressure rebound, and drives the fixed ring 21 to slide to the original position, so that the drill bit 17 can be always positioned in the grid baffle 22, the situation that drilling scraps fly out is further reduced, and the elastic piece 32, preferably a spiral spring piece, can also use a rubber pad to achieve the purposes.
The improvement of the embodiment is that: firstly, the sealing sucker 11 arranged at the opening of the sleeve ring body 1 can enable the sleeve ring body 1 to be in sealing fit with the inner wall of a tunnel, so that gas permeation is effectively reduced, the drill bit 17 can be used for telescopic drilling, the fixed ring 21 arranged on the surface of the drill bit 17 and the grid baffle 22 fixedly connected with the end part of the fixed ring 21 are utilized, the drill bit 17 can be positioned in the grid baffle 22, and when the drill bit 17 is used for drilling the coal seam and the coal seam surface, waste scraps generated by drilling can be stored in the grid baffle 22, so that the situation that the waste scraps drift in the sleeve ring body 1 and are extracted together with the gas can be reduced;
when the air cylinder 15 and the piston rod 16 drive the drill bit 17 to extend into the coal seam for drilling, the end part of the grid baffle 22 is attached to the surface of the coal seam, the drill bit 17 extends into the coal seam, and meanwhile, the grid baffle 22 and the fixed ring 21 can be extruded, so that the fixed ring 21 can slide in the groove 31, when the drill bit 17 is pulled out under the drive of the air cylinder 15, the elastic piece 32 positioned between the fixed ring 21 and the inner wall of the groove 31 loses pressure rebound, the fixed ring 21 is driven to slide to the original position, the drill bit 17 can be always positioned in the grid baffle 22, and therefore the condition that drilling scraps fly out is further reduced;
after the drill bit 17 stretches into the coal seam, gas can float in the sleeve ring body 1 through drilling, the supporting rod 12 is utilized to assist the fan 13 to be installed on the surface of the sleeve ring body 1, and the fan 13 and the air suction pipe 14 arranged in the fan 13 are utilized to discharge the gas in the sleeve ring body 1.
Considering the gas flowing condition in the coal seam, in order to facilitate the gas absorbing pipe 14 to absorb the gas, the grid baffle 22 is composed of a middle pad 221 and a fixing piece 222, one end of the middle pad 221 is connected with the surface of the fixing ring 21, the other end of the middle pad 221 is connected with the end of the fixing piece 222, the middle pad 221 is made of elastic material, and a plurality of through holes 4 are formed in the surface of the fixing piece 222 to assist the gas flowing.
The improvement is that: the grid baffle 22 is composed of the middle pad 221 and the fixing piece 222, the middle pad 221 is made of elastic materials, when the drill bit 17 stretches into a coal layer, the middle pad 221 can be driven to be extruded, the grid baffle 22 can be always blocked on the periphery of the drill bit 17, and the gas emitted by the coal layer can be assisted to circulate by utilizing the through holes 4 formed in the surface of the fixing piece 222, so that the gas can be more conveniently extracted.
Since the drill bit 17 drills the coal seam and the coal seam surface, the scraps generated by the drilling flow into the grid baffle 22, in order to further reduce the phenomenon of the scraps drifting out, the inner wall of the middle pad 221 is provided with an inclined surface 23 inclined to the direction of the fixed ring 21, as shown in fig. 3-5, a storage bin for storing the scraps can be formed between the inclined surface 23 and the fixed ring 21, and the inclined surface 23 is used for assisting the flow of the scraps generated by drilling.
The improvement is that: by utilizing the inclined surface 23 arranged on the inner wall of the middle pad 221, and the inclined surface 23 is inclined towards the direction of the fixed ring 21, on one hand, the waste scraps generated during drilling can be assisted to slide, and on the other hand, the waste scraps can be stored in a storage bin formed between the inclined surface 23 and the fixed ring 21, so that the condition of the waste scraps is reduced when the gas is pumped out by the gas suction pipe 14.
To sum up, the working principle of the scheme is as follows: firstly, the sealing sucker 11 arranged at the opening of the sleeve ring body 1 can enable the sleeve ring body 1 to be in sealing fit with the inner wall of a tunnel, so that gas permeation is effectively reduced, the drill bit 17 can be used for telescopic drilling by utilizing the air cylinder 15 arranged in the sleeve ring body 1 and the piston rod 16 sliding in the air cylinder 15, the drill bit 17 can be positioned in the grid baffle 22 by utilizing the fixed ring 21 arranged on the surface of the drill bit 17 and the grid baffle 22 fixedly connected with the end part of the fixed ring 21, when the drill bit 17 is used for drilling a coal seam and the surface of the coal seam, the grid baffle 22 is formed by the middle pad 221 and the fixed piece 222, the middle pad 221 is made of elastic materials, when the drill bit 17 stretches into the coal seam, the middle pad 221 can be driven to be extruded, the grid baffle 22 can be always blocked at the periphery of the drill bit 17, and the gas emitted by the coal seam can be assisted to circulate by utilizing the plurality of through holes 4 arranged on the surface of the fixed piece 222, so that gas can be more conveniently extracted;
by utilizing the inclined surface 23 arranged on the inner wall of the middle pad 221, and the inclined surface 23 is inclined towards the direction of the fixed ring 21, on one hand, the waste scraps generated during drilling can be assisted to slide, and on the other hand, the waste scraps can be stored in a storage bin formed between the inclined surface 23 and the fixed ring 21, so that when gas is pumped out by the gas suction pipe 14, the condition of pumping the waste scraps is reduced;
when the air cylinder 15 and the piston rod 16 drive the drill bit 17 to extend into the coal seam for drilling, the end part of the grid baffle 22 is attached to the surface of the coal seam, the drill bit 17 extends into the coal seam, and meanwhile, the grid baffle 22 and the fixed ring 21 can be extruded, so that the fixed ring 21 can slide in the groove 31, when the drill bit 17 is pulled out under the drive of the air cylinder 15, the elastic piece 32 positioned between the fixed ring 21 and the inner wall of the groove 31 loses pressure rebound, the fixed ring 21 is driven to slide to the original position, the drill bit 17 can be always positioned in the grid baffle 22, and therefore the condition that drilling scraps fly out is further reduced;
after the drill bit 17 stretches into the coal seam, gas can float in the sleeve ring body 1 through drilling, the supporting rod 12 is utilized to assist the fan 13 to be installed on the surface of the sleeve ring body 1, and the fan 13 and the air suction pipe 14 arranged in the fan 13 are utilized to discharge the gas in the sleeve ring body 1.
The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present utility model, and are not intended to limit the utility model, and that various changes and modifications may be made therein without departing from the spirit and scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (5)
1. The utility model provides a many coal seam tunnel gas permeation prevention structure, includes cover ring body (1), its characterized in that: the novel air conditioner is characterized in that a supporting rod (12) is fixedly connected to the outer wall of the sleeve ring body (1), the supporting rod (12) is used for assisting a fan (13) to be installed on the surface of the sleeve ring body (1), an air suction pipe (14) is installed at the end part of the fan (13), one end of the air suction pipe (14) stretches into the sleeve ring body (1), a drill bit (17) is arranged in the sleeve ring body (1), the drill bit (17) stretches into an air cylinder (15), a piston rod (16) is slidably arranged in the air cylinder (15), the other end of the piston rod (16) is connected with the end part of the drill bit (17), and a sealing sucker (11) is arranged at the opening of the sleeve ring body (1);
the surface of drill bit (17) has cup jointed protection component (2), protection component (2) are used for carrying out the check to the surface of drill bit (17), the tip of protection component (2) links to each other with drill bit (17) through slip subassembly (3), slip subassembly (3) are used for promoting protection effect of protection component (2) to drill bit (17).
2. The multi-seam tunnel gas permeation prevention structure according to claim 1, wherein: the protection assembly (2) comprises a fixing ring (21) positioned on the surface of the drill bit (17), one end, far away from the piston rod (16), of the fixing ring (21) is fixedly connected with a grid baffle (22), and the drill bit (17) is positioned in the grid baffle (22) and used for conducting grid protection on the periphery of the drill bit (17).
3. The multi-seam tunnel gas permeation prevention structure according to claim 2, wherein: the sliding assembly (3) comprises a groove (31) formed in the surface of the drill bit (17), the fixing ring (21) slides in the groove (31), one side, close to the piston rod (16), of the fixing ring (21) is connected with an elastic piece (32), and the other end of the elastic piece (32) is fixedly connected with the inner wall of the groove (31).
4. The multi-seam tunnel gas permeation prevention structure according to claim 2, wherein: the grid baffle plate (22) is composed of a middle pad (221) and a fixing piece (222), one end of the middle pad (221) is connected with the surface of the fixing ring (21), the other end of the middle pad is connected with the end part of the fixing piece (222), the middle pad (221) is made of elastic materials, and a plurality of through holes (4) are formed in the surface of the fixing piece (222) and used for assisting gas circulation.
5. The multi-seam tunnel gas permeation prevention structure according to claim 4, wherein: the inner wall of the middle pad (221) is provided with an inclined surface (23) inclined towards the direction of the fixed ring (21), a storage bin for storing scraps can be formed between the inclined surface (23) and the fixed ring (21), and the inclined surface (23) is used for assisting in flowing scraps generated by drilling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321457896.7U CN220015139U (en) | 2023-06-09 | 2023-06-09 | Multi-coal-bed tunnel gas permeation prevention structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321457896.7U CN220015139U (en) | 2023-06-09 | 2023-06-09 | Multi-coal-bed tunnel gas permeation prevention structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220015139U true CN220015139U (en) | 2023-11-14 |
Family
ID=88671240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321457896.7U Active CN220015139U (en) | 2023-06-09 | 2023-06-09 | Multi-coal-bed tunnel gas permeation prevention structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220015139U (en) |
-
2023
- 2023-06-09 CN CN202321457896.7U patent/CN220015139U/en active Active
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