CN109139081B - High-gas ultra-long tunnel construction ventilation method - Google Patents
High-gas ultra-long tunnel construction ventilation method Download PDFInfo
- Publication number
- CN109139081B CN109139081B CN201811097079.9A CN201811097079A CN109139081B CN 109139081 B CN109139081 B CN 109139081B CN 201811097079 A CN201811097079 A CN 201811097079A CN 109139081 B CN109139081 B CN 109139081B
- Authority
- CN
- China
- Prior art keywords
- tunnel
- ventilation
- air
- flow fan
- shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000009423 ventilation Methods 0.000 title claims abstract description 82
- 238000010276 construction Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000007789 gas Substances 0.000 claims description 36
- 238000005192 partition Methods 0.000 claims description 6
- 239000000779 smoke Substances 0.000 claims description 4
- 238000005422 blasting Methods 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 238000010790 dilution Methods 0.000 claims description 3
- 239000012895 dilution Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 230000000007 visual effect Effects 0.000 claims description 3
- 239000002912 waste gas Substances 0.000 claims description 3
- 238000011897 real-time detection Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 11
- 238000005516 engineering process Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/006—Ventilation at the working face of galleries or tunnels
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Ventilation (AREA)
Abstract
A ventilation method for high gas extra-long tunnel construction is characterized in that ventilation is carried out in two stages according to construction progress; the first stage is as follows: before the ventilation shaft is communicated, the working areas of the inlet and the outlet at the two ends of the tunnel and the working area of the inclined shaft in the middle of the tunnel adopt a press-in ventilation mode; and a second stage: after the ventilation vertical shaft is communicated, the ventilation modes of the work area at the inlet and the outlet of the two ends of the tunnel are unchanged, and a jet fan is additionally arranged in the hole according to the construction progress to strengthen the return air; the inclined shaft work area in the middle of the tunnel adopts an innovative ventilation mode of self-shaft suction type ventilation and self-inclined shaft exhaust, and a jet fan is additionally arranged in the tunnel according to the construction progress of working faces at two ends of the inclined shaft work area, so that dirty air is continuously exhausted from the inclined shaft through the jet fan. According to the invention, through reasonable matching of two ventilation modes in different stages and different work areas, the ventilation effect is improved, and the construction cost can be greatly reduced. Meanwhile, the personal safety of constructors is guaranteed by arranging the wind power locking system and the tile power locking system.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a ventilation method for high-gas extra-long tunnel construction.
Background
With the rapid development of national railway construction, some long tunnels and even extra long tunnels are gradually increased, and ventilation also becomes a critical problem, and the conventional press-in type ventilation and roadway type ventilation have long ventilation distance, large loss of air volume and air speed, increased cost and poor air return effect. It is difficult to meet the ventilation requirements of long tunnels and even extra-long tunnels. The use of shaft ventilation forms an essential component in the increasing number of long gas tunnels. The ventilation distance is reduced by the ventilation technology of the ultra-deep vertical shaft, so that on one hand, a good working environment is provided for operating personnel engaged in construction, and harm to the health of the operating personnel due to poor ventilation and smoke dissipation conditions is reduced; on the other hand, the cost can be saved, and the economic benefit can be improved. However, the existing shaft ventilation technology only uses a shaft as a natural air exhaust channel, and the air intake mode is not changed, so that the ventilation problem of the construction of the high-gas extra-long tunnel is not fundamentally solved.
Disclosure of Invention
The invention provides a ventilation method for construction of a high-gas extra-long tunnel, which comprises the following steps of ventilating in two stages according to the construction progress, adopting a positive hole and an inclined shaft hole to perform press-in type ventilation before a vertical shaft is communicated, keeping the ventilation form of the positive hole unchanged after the vertical shaft is communicated, taking air from an inclined shaft work area through the vertical shaft, and exhausting air from the inclined shaft. Through different stages, two ventilation modes in different work areas are reasonably matched, so that the ventilation effect is improved, and the construction cost can be greatly reduced. Meanwhile, the wind power locking system and the tile power locking system are arranged, so that the construction risk of the high gas tunnel is effectively reduced, and the personal safety of constructors is guaranteed.
The technical scheme adopted by the invention is as follows: a ventilation method for the construction of a high-gas extra-long tunnel is characterized in that the tunnel is divided into two stages for ventilation according to the construction progress;
the first stage is as follows: before the ventilation vertical shaft is communicated, an axial flow fan I is respectively arranged outside 30m of the front openings at the two ends of the tunnel, and fresh air is delivered to a working surface in the tunnel through an air pipe I by the air outlet end of the axial flow fan I; two axial flow fans II are respectively arranged outside 30m of the inclined shaft hole at one side of the tunnel, and fresh air is delivered to working surfaces at two ends in the hole through air pipes II at air outlet ends of the two axial flow fans II;
and a second stage: after the ventilation shaft is communicated, under the premise that the forced ventilation mode of the positive holes at the two ends of the tunnel is not changed, adding a jet fan I to the hole every 500m from the working surface in the hole according to the construction progress of the working surface in the hole, and continuously discharging dirty air along the positive holes at the two ends of the tunnel through the jet fan I; the ventilation vertical shaft is positioned on one side far away from the inclined shaft, an air inlet of the ventilation vertical shaft is positioned in a low-lying ground surface area, a transverse channel is arranged at the bottom of the ventilation vertical shaft, and the transverse channel and the main tunnel are sealed through a partition wall; moving two axial flow fans II outside the hole of the inclined shaft into the transverse channel, and moving two air pipes II into the main tunnel and arranging the two air pipes II at one side far away from the inclined shaft; two tuber pipes II pass the partition wall and are connected with the air-out end of two axial fan II respectively, and the fresh air that will ventilate the shaft entering passes through tuber pipe II and delivers to both ends working face in the hole, according to the construction progress of both ends working face in the hole, adds a efflux fan II from the working face in the hole every 500m, makes dirty wind follow efflux fan II and continues to discharge from the inclined shaft.
Further, calculating the air quantity required by tunnel construction ventilation according to the blasting smoke discharge, the lowest allowable air speed, the gas emission quantity, the maximum number of people working in the tunnel at the same time and the internal combustion engine waste gas used in the dilution tunnel respectively, and selecting the maximum value; and then selecting the models of the axial flow fan I, the axial flow fan II, the jet flow fan I and the jet flow fan II according to the maximum value of the air quantity required by ventilation, wherein the axial flow fan II, the jet flow fan I and the jet flow fan II are required to be explosion-proof products.
A tile power lock and a wind power lock system are arranged in the tunnel, and working conditions are set; the working conditions of the watt-hour lock and the wind-hour lock system are set according to the gas concentration and the wind speed near a real-time detection working surface, and the method specifically comprises the following steps:
(1) when the gas concentration is more than or equal to 0.3 percent, an audible and visual alarm is given out;
(2) when the gas concentration is more than or equal to 0.5 percent or when any one of an axial flow fan and a jet flow fan stops working or the return air speed is less than 0.5m/s, a control signal is sent to realize the power failure of the tunnel;
(3) when the gas concentration is less than 0.5% and the axial flow fan and the jet flow fan recover to work, the locking is released, and the power supply of the tunnel is recovered.
Furthermore, local fans are arranged on the front side and the rear side of the lining trolley and in the cavern part in the tunnel during construction, air outlets of the local fans arranged on the front side and the rear side of the lining trolley face the direction of exhausting dirty air, and air outlets of the local fans arranged on the cavern part face the interior of the tunnel.
Compared with the prior art, the invention has the advantages and effects that:
1. according to the invention, a staged ventilation scheme is implemented according to the tunneling length, so that the ventilation effect of the high-gas tunnel is ensured, the gas concentration in the tunnel is diluted, the energy-saving and emission-reducing effects are achieved, and the construction cost can be greatly reduced; meanwhile, the wind power locking system and the tile power locking system are arranged, so that the construction risk of the high gas tunnel is effectively reduced, and the personal safety of constructors is guaranteed.
2. According to the invention, the press-in type ventilation is adopted in the tunnel entrance and exit working area and the inclined shaft working area before the vertical shaft is communicated, so that the condition of wasting ventilation resources in the initial stage of tunnel construction can be avoided, the construction ventilation cost is favorably reduced, and after the vertical shaft is communicated, the vertical shaft is adopted for air intake and the inclined shaft is adopted for air exhaust and ventilation, the length of an air pipe can be shortened, and the air supply effect is better.
3. The invention adopts the jet fan to accelerate the fluidity of the gas in the tunnel, so that the dirty air in the tunnel flows out of the inclined shaft quickly, thereby ensuring good ventilation and safe construction of the tunnel. Compared with the prior shaft ventilation technology, the shaft is only used as a natural exhaust channel, the fresh air inlet amount of the shaft is larger than that of an inclined shaft, the gas near the tunnel face is quickly diluted, and the construction safety is higher.
4. The air inlet of the ventilation vertical shaft is positioned in a low-lying ground surface area, and the axial flow fan is arranged at the bottom of the vertical shaft. Due to the fact that the low-lying area is low in air pressure, the fresh air entering amount of the vertical shaft is guaranteed. The axial flow fan is arranged at the bottom of the vertical shaft, so that the length of the air pipe can be greatly shortened, and the air supply effect is better.
5. The local fans are arranged on the front side and the rear side of the lining trolley and the cave part in the cave during construction, so that gas accumulated at the positions can be quickly mixed into flowing air flow, and safety accidents caused by continuous accumulation of the gas are avoided.
Drawings
Fig. 1 is a schematic view of the shaft ventilation before penetration of the shaft of the present invention;
fig. 2 is a schematic view of ventilation after the shaft is communicated.
Detailed Description
An embodiment of the invention is described below with reference to fig. 1-2.
The first step is as follows: calculating the air quantity required by tunnel construction ventilation according to the blasting smoke discharge, the lowest allowable air speed, the gas emission quantity, the maximum number of people working in the tunnel at the same time and the internal combustion engine waste gas used in the dilution tunnel respectively, and selecting the maximum value; and selecting the models of the axial flow fan I2, the axial flow fan II 4, the jet flow fan I6 and the jet flow fan II 8 according to the maximum air quantity required by ventilation, wherein the axial flow fan II 4, the jet flow fan I6 and the jet flow fan II 8 are required to be explosion-proof products. Meanwhile, a watt-hour lock and a wind-electricity lock system are arranged in the tunnel, and working conditions are set.
The second step is that: before the ventilation shaft 1 is communicated, an axial flow fan I2 is respectively arranged outside a front opening 30m at two ends of a tunnel, and fresh air is delivered to a working surface (tunnel face) in the tunnel through an air pipe I3 at an air outlet end of the axial flow fan I2; two axial flow fans II 4 are respectively arranged outside a 30m inclined shaft opening on one side of the tunnel, and fresh air is sent to working surfaces (tunnel faces) at two ends in the tunnel by air outlet ends of the two axial flow fans II 4 through air pipes II 5;
the third step: after the ventilation shaft 1 is communicated, under the premise that the forced ventilation mode of the positive holes at the two ends of the tunnel is not changed, according to the construction progress of a working surface in the tunnel, adding a jet fan I6 to the hole every 500m from the working surface in the tunnel, and continuously discharging dirty air along the positive holes at the two ends of the tunnel through the jet fan I6; the ventilation vertical shaft 1 is positioned on one side far away from the inclined shaft, an air inlet of the ventilation vertical shaft 1 is positioned in a low-lying ground surface area, a transverse channel 7 is arranged at the bottom of the ventilation vertical shaft 1, and the transverse channel 7 and the main tunnel are sealed through a partition wall 9; two axial flow fans II 4 outside the hole of the inclined shaft are moved into the transverse channel 7, and two air pipes II 5 are moved into the main hole and are arranged on one side far away from the inclined shaft; two tuber pipes II 5 pass through partition wall 9 and are connected with the air-out end of two axial fan II 4 respectively, and the fresh air that will ventilate the shaft 1 entering passes through tuber pipe II 5 and sends both ends working face (face) in the hole to, according to the construction progress of both ends working face in the hole, add a efflux fan II 8 in the hole from the working face every 500m, make dirty wind follow efflux fan II 8 and continue and discharge from the inclined shaft.
The working conditions of the tile electric locking system and the wind electric locking system are set by detecting the gas concentration and the wind speed near a working surface in real time during construction, and the method specifically comprises the following steps:
(1) when the gas concentration is more than or equal to 0.3 percent, an audible and visual alarm is given out;
(2) when the gas concentration is more than or equal to 0.5 percent or when any one of an axial flow fan and a jet flow fan stops working or the return air speed is less than 0.5m/s, a control signal is sent to realize the power failure of the tunnel;
(3) when the gas concentration is less than 0.5% and the axial flow fan and the jet flow fan recover to work, the locking is released, and the power supply of the tunnel is recovered.
And when the ventilation of the second step and the third step is implemented, local fans are arranged on the front side and the rear side of the lining trolley and the cavern part in the cavern during construction, air outlets of the local fans arranged on the front side and the rear side of the lining trolley face the exhaust direction of the dirty air, and air outlets of the local fans arranged on the cavern part face the cavern. The gas accumulated at the positions can be quickly mixed into flowing gas flow, and safety accidents caused by continuous accumulation of the gas are avoided.
The inlet and outlet work areas of the invention adopt hole press-in type ventilation. And the ventilation of the inclined shaft work area takes the shaft through as a node, the shaft is pressed into the ventilation from the inclined shaft hole before the shaft is through, the shaft is sucked into the ventilation from the shaft after the shaft is through, and an innovative ventilation mode of exhausting air from the inclined shaft greatly shortens the length of the air pipe and enables the air supply effect to be better. Before and after the shaft of prior art had been linked up, the inclined shaft worker district forced ventilation mode is unchangeable, leads to along with the construction progress increase, and tuber pipe length constantly lengthens, and inclined shaft length ratio shaft is a lot of longer in addition, and wind-force loss is great, makes the ventilation effect from inclined shaft entrance to the cave forced ventilation more and more poor, and the loss is overcome to the fan that can only change more powerful under the general condition, leads to the ventilation cost to increase by a wide margin. In addition, the air inlet and outlet work areas and the inclined shaft work area of the invention adopt a mode of arranging jet fans at intervals to accelerate the return air speed, thereby further improving the ventilation effect.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. A high gas extra-long tunnel construction ventilation method is characterized in that: the tunnel is divided into two stages for ventilation according to the construction progress;
the first stage is as follows: before the ventilation vertical shaft (1) is communicated, an axial flow fan I (2) is respectively arranged outside a positive hole opening 30m at two ends of the tunnel, and fresh air is sent to a working surface in the hole by an air outlet end of the axial flow fan I (2) through an air pipe I (3); two axial flow fans II (4) are respectively arranged outside 30m of an inclined shaft opening on one side of the tunnel, and fresh air is sent to working surfaces at two ends in the tunnel by air outlet ends of the two axial flow fans II (4) through air pipes II (5);
and a second stage: after the ventilation vertical shaft (1) is communicated, under the premise that the forced ventilation mode of the positive holes at the two ends of the tunnel is not changed, according to the construction progress of a working surface in the tunnel, adding a jet fan I (6) to the hole every 500m from the working surface in the tunnel, and continuously discharging dirty air along the positive holes at the two ends of the tunnel through the jet fan I (6); the ventilation vertical shaft (1) is positioned on one side far away from the inclined shaft, an air inlet of the ventilation vertical shaft (1) is positioned in a low-lying ground surface area, a transverse channel (7) is arranged at the bottom of the ventilation vertical shaft (1), and the transverse channel (7) and the main hole are sealed through a partition wall (9); two axial flow fans II (4) outside the hole of the inclined shaft are moved into the transverse channel (7), and two air pipes II (5) are moved into the main hole and are arranged on one side far away from the inclined shaft; two tuber pipes II (5) pass partition wall (9) and are connected with the air-out end of two axial fan II (4) respectively, and the fresh air that will ventilate shaft (1) and get into is delivered to both ends working face in the hole through tuber pipe II (5), according to the construction progress of both ends working face in the hole, sets up a efflux fan II (8) from the working face every 500m in the hole, makes dirty wind follow efflux fan II (8) and continue from the inclined shaft and discharge.
2. The ventilation method for the construction of the high gas extra-long tunnel according to claim 1, characterized in that: calculating the air quantity required by tunnel construction ventilation according to the blasting smoke discharge, the lowest allowable air speed, the gas emission quantity, the maximum number of people working in the tunnel at the same time and the internal combustion engine waste gas used in the dilution tunnel respectively, and selecting the maximum value; and then selecting the models of the axial flow fan I (2), the axial flow fan II (4), the jet flow fan I (6) and the jet flow fan II (8) according to the maximum value of the air quantity required by ventilation, wherein the axial flow fan II (4), the jet flow fan I (6) and the jet flow fan II (8) are required to be explosion-proof products.
3. The ventilation method for the construction of the high gas extra-long tunnel according to claim 2, characterized in that: a tile power lock and a wind power lock system are arranged in the tunnel, and working conditions are set; the working conditions of the watt-hour lock and the wind-hour lock system are set according to the gas concentration and the wind speed near a real-time detection working surface, and the method specifically comprises the following steps:
(1) when the gas concentration is more than or equal to 0.3 percent, an audible and visual alarm is given out;
(2) when the gas concentration is more than or equal to 0.5 percent or when any one of an axial flow fan and a jet flow fan stops working or the return air speed is less than 0.5m/s, a control signal is sent to realize the power failure of the tunnel;
(3) when the gas concentration is less than 0.5% and the axial flow fan and the jet flow fan recover to work, the locking is released, and the power supply of the tunnel is recovered.
4. The ventilation method for the construction of the high gas ultra-long tunnel according to claim 1, 2 or 3, characterized in that: local fans are arranged on the front side and the rear side of the lining trolley and in the cavern part during construction, air outlets of the local fans arranged on the front side and the rear side of the lining trolley face the direction of exhausting dirty air, and air outlets of the local fans arranged on the cavern part face the cavern.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811097079.9A CN109139081B (en) | 2018-09-20 | 2018-09-20 | High-gas ultra-long tunnel construction ventilation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811097079.9A CN109139081B (en) | 2018-09-20 | 2018-09-20 | High-gas ultra-long tunnel construction ventilation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109139081A CN109139081A (en) | 2019-01-04 |
| CN109139081B true CN109139081B (en) | 2020-03-17 |
Family
ID=64815018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811097079.9A Active CN109139081B (en) | 2018-09-20 | 2018-09-20 | High-gas ultra-long tunnel construction ventilation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109139081B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109707433A (en) * | 2019-03-04 | 2019-05-03 | 中铁十六局集团有限公司 | A kind of inclined shaft ventilation technics of constructing tunnel |
| CN110130969A (en) * | 2019-05-16 | 2019-08-16 | 黄河勘测规划设计研究院有限公司 | Method of ventilation for Super-long tunnel construction |
| CN110185485B (en) * | 2019-07-08 | 2023-12-05 | 中国电建集团成都勘测设计研究院有限公司 | Hot-pressing type tunnel ventilation system for high-altitude high-ground-temperature long tunnel |
| CN111219203A (en) * | 2020-03-19 | 2020-06-02 | 中铁二院工程集团有限责任公司 | Gas discharge system of supplementary gallery |
| CN115749901A (en) * | 2022-11-02 | 2023-03-07 | 中铁十八局集团有限公司 | Two-stage ventilation structure and method for adjacent construction section tunnels |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH451232A (en) * | 1967-03-14 | 1968-05-15 | Expilly Paul | Construction method of at least two parallel galleries |
| CN101761352A (en) * | 2010-01-13 | 2010-06-30 | 中铁隧道集团有限公司 | Ventilation method for inclined well and construction workface in tunnel construction |
| CN202391448U (en) * | 2011-12-14 | 2012-08-22 | 中铁十二局集团有限公司 | Roadway type ventilating structure of no-air door of long-distance tunnel |
| CN202520352U (en) * | 2012-03-06 | 2012-11-07 | 中铁二十二局集团第五工程有限公司 | Large-cross section gas outburst tunnel ventilating system |
| CN203097922U (en) * | 2013-03-15 | 2013-07-31 | 中铁隧道集团有限公司 | Multiple-working face ventilation structure for long and large tunnel |
| CN104405430B (en) * | 2014-10-08 | 2017-05-10 | 西南交通大学 | Ventilation system and ventilation method for single-cavern large-section extra-long tunnel construction |
| CN105240040B (en) * | 2015-10-30 | 2018-03-09 | 中铁隧道集团有限公司 | The method of ventilation of the double hole constructions of inclined shaft auxiliary |
| CN205349398U (en) * | 2016-01-21 | 2016-06-29 | 中铁十八局集团隧道工程有限公司 | Air supply system in large and long tunnels hole of supplementary construction of many inclined shafts |
| CN106930781A (en) * | 2017-03-29 | 2017-07-07 | 中铁十七局集团第三工程有限公司 | A kind of gas tunnel method of ventilation and its structure |
-
2018
- 2018-09-20 CN CN201811097079.9A patent/CN109139081B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109139081A (en) | 2019-01-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109139081B (en) | High-gas ultra-long tunnel construction ventilation method | |
| CN104405430B (en) | Ventilation system and ventilation method for single-cavern large-section extra-long tunnel construction | |
| CN105240040B (en) | The method of ventilation of the double hole constructions of inclined shaft auxiliary | |
| CN101215973A (en) | Tunnel construction jet flow laneway ventilation method | |
| CN203097922U (en) | Multiple-working face ventilation structure for long and large tunnel | |
| CN104314600B (en) | Article three, the construction ventilation method of Parallel Tunnel | |
| CN202520352U (en) | Large-cross section gas outburst tunnel ventilating system | |
| CN108301859A (en) | A kind of Large Underground water seal cave depot group push-pull type construction ventilation method and its system | |
| CN202391448U (en) | Roadway type ventilating structure of no-air door of long-distance tunnel | |
| CN107387145B (en) | Long-long tunnel ventilation system with long-distance air supply function | |
| CN112780330A (en) | Construction ventilation method for parallel three-hole tunnel press-in type ventilation | |
| CN106930781A (en) | A kind of gas tunnel method of ventilation and its structure | |
| CN211230483U (en) | Middle partition plate air duct type railway double-hole tunnel | |
| CN111022110B (en) | Method for controlling gas in one-end roadway of wind-cut driving working face during mine windward period | |
| CN110318799B (en) | Ventilation method for long and large tunnel construction | |
| WO2021196707A1 (en) | Staged ventilation method based on construction of complex cavern group | |
| CN103527236A (en) | Gas tunnel mixed type ventilation method | |
| CN201281421Y (en) | Tunnel aspiration channel | |
| CN211950572U (en) | System for discharging gas in flat guide | |
| CN206707747U (en) | A kind of gas tunnel aeration structure | |
| CN214787496U (en) | Construction ventilation structure of supplementary parallel three hole method tunnels of shaft | |
| CN206409267U (en) | A kind of underground mining exhaust ventilation structure | |
| CN220469992U (en) | Submarine tunnel construction stage ventilation system | |
| CN217897934U (en) | Drawing-out type ventilation system for driving face | |
| CN104533500A (en) | Natural ventilation system and method for coal mine underground |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |