CN106930781A - A kind of gas tunnel method of ventilation and its structure - Google Patents
A kind of gas tunnel method of ventilation and its structure Download PDFInfo
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- CN106930781A CN106930781A CN201710198549.XA CN201710198549A CN106930781A CN 106930781 A CN106930781 A CN 106930781A CN 201710198549 A CN201710198549 A CN 201710198549A CN 106930781 A CN106930781 A CN 106930781A
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- 238000009423 ventilation Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000005641 tunneling Effects 0.000 claims abstract description 15
- 230000008676 import Effects 0.000 claims abstract description 11
- 238000005273 aeration Methods 0.000 claims description 12
- 239000012895 dilution Substances 0.000 claims description 5
- 238000010790 dilution Methods 0.000 claims description 5
- 230000002776 aggregation Effects 0.000 claims description 4
- 238000004220 aggregation Methods 0.000 claims description 4
- 238000009415 formwork Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 9
- 230000007717 exclusion Effects 0.000 abstract description 5
- 230000002708 enhancing effect Effects 0.000 abstract 1
- 238000009412 basement excavation Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000004630 mental health Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
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- 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
-
- 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
- E21F1/04—Air ducts
-
- 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
- E21F1/04—Air ducts
- E21F1/06—Duct connections
-
- 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
- E21F1/08—Ventilation arrangements in connection with air ducts, e.g. arrangements for mounting ventilators
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Ventilation (AREA)
Abstract
The invention discloses a kind of gas tunnel method of ventilation and its structure, belong to construction ventilation of tunnel technical field.Including axial flow blower, ajutage, control for air distribution and jet blower；Axial flow blower is arranged at the import of parallel heading and is connected with the ajutage for matching；Ajutage is connected near the tunneling operation face rear of each closed cavern of positive hole along parallel heading and horizontal hole arrangement；The control for air distribution is positioned close to the horizontal hole of axial flow blower and the turnout position of parallel heading；Jet blower is provided with each closed cavern in positive hole, in parallel heading and at the air door in horizontal hole.The present invention can meet the ventilation requirement of the different constructing tunnel scope of operations, return air wind speed is accelerated by installing jet blower additional, and the exclusion to contaminated air serves guiding function, improve drafting efficiency, shorten ventilation time, enhancing ventilation effect, improves the utilization rate of press-in fresh air, it is ensured that the safety of staff.
Description
Technical field
The present invention relates to construction ventilation of tunnel technical field.
Background technology
Construction ventilation is one of important procedure of gas tunnel construction, is the key of gas tunnel construction safety construction, is closed
The ventilating system of reason, preferable ventilation effect are to realize Rapid Construction of Tunnels, ensure construction safety and workmen's physical and mental health
Important guarantee.Gas tunnel of growing up uses district operation, using the horizontal hole of insertion parallel heading and tunnel UNICOM using press-in
Formula ventilation is the means of ventilation commonly used during gas tunnel is constructed.It is primarily present when ventilating is implemented to the scope of operation simultaneously following
Technical problem：（1）When implementing to divulge information to multiple scope of operations, each scope of operation air output is identical, it may appear that different work face air quantity mistake
Surplus and short situation, fresh air utilization rate is low.（2）The positive hole of gas requires that ventilation return air speed needs to reach 1m/s, works as ventilation
When distance increases, common approach is increase air-supply axial flow blower power, thus causes the increase of ventilation cost input,（3）To many
When the individual scope of operation implements ventilation, because cavern's structure is more, there is return air interior circulation, greatly reduce drafting efficiency.（4）Insertion
Parallel heading construction cost is high.To solve the above problems, it is necessary to propose that a kind of many scope of operations of non-penetrating parallel heading are unbalanced logical
Wind method.
The content of the invention
The technical problem to be solved in the present invention is directed to above-mentioned the deficiencies in the prior art, there is provided a kind of gas tunnel ventilation side
Method and its structure, the ventilation to multiple closed cavern's tunneling operation faces is realized using parallel heading, meets different constructing tunnels
The ventilation requirement of the scope of operation, return air wind speed is accelerated by installing jet blower additional, and exclusion to contaminated air serves guiding
Effect, improves drafting efficiency, shortens ventilation time, strengthens ventilation effect, improves the utilization rate of press-in fresh air, it is ensured that
The safety of staff.
In order to solve the above technical problems, the technical solution used in the present invention is：A kind of gas tunnel method of ventilation,（1）
Including positive hole and parallel heading, the positive hole is connected with parallel heading by horizontal hole, and horizontal hole is place is provided with wind with one voice with positive hole
Door；Positive hole is made up of several caverns tunneled simultaneously, and its two ends is open cavern, and middle cavern is closed hole
Room, is named as 1# caverns, 2# caverns successively, until n# caverns, each closed cavern is provided with what is connected with parallel heading
Horizontal hole, is named as the horizontal holes of 1#, the horizontal holes of 2# successively, until the horizontal holes of n#；
（2）Axial flow blower is installed at the import of parallel heading, the axial flow blower is connected and passes through with the ajutage for matching
Fresh air is pressed into ajutage the tunneling operation face of positive each cavern of hole, is the air-supply of each cavern, and dilution contaminated air is through horizontal stroke
Hole and parallel heading are discharged；
（3）Control for air distribution is set in the turnout position by horizontal hole, the control to different cavern's air outputs is realized；
（4）One jet blower is respectively set at the air door in parallel heading and horizontal hole, and the blast formed by jet blower is accelerated
Guiding return air direction；
（5）The gas blowout that dead angle position axial-flow electric fan for local ventilation in each closed cavern in positive hole will be assembled, makes
Mix with return air after discharge.
Preferably, the dead angle position of each closed cavern in the positive hole is turned for serious place of being backbreak in cavern with cavern
The positions such as angle.
A kind of gas tunnel aeration structure, including axial flow blower, ajutage, control for air distribution and jet blower；Axle
Flow fan is arranged at the import of parallel heading and is connected with the ajutage for matching；Ajutage is along parallel heading and horizontal hole cloth
Put near the tunneling operation face rear for being connected to each closed cavern of positive hole；The control for air distribution is positioned close to axle stream
The horizontal hole of blower fan and the turnout position of parallel heading；In each closed cavern in positive hole, the air door in parallel heading and horizontal hole
Place is provided with jet blower.
Preferably, the axial flow blower is arranged on parallel heading import outside and height is more than at parallel heading hole
Return air road junction.
Preferably, the jet blower in each closed cavern of the positive hole is arranged at air return section.
Preferably, a kind of gas tunnel aeration structure according to claim 3, it is characterised in that the positive hole is each
Jet blower in individual closed cavern can be moved with formwork jumbo, arrange that one used as main wind path, main wind tube using double wind paths
Two lining chassis are passed through, one used as standby wind path in addition, immediately following two lining chassis.
Preferably, the air-out port of the ajutage is arranged on apart from the position in 10~30 meters of tunneling operation face.
Preferably, the dead angle position in each closed cavern of the positive hole is provided with axial-flow electric fan for local ventilation.
Preferably, the horizontal hole sets between each closed cavern in positive hole and parallel heading every 200~500 meters
Put one.
Preferably, the ajutage is fixedly installed on the wall on each closed cavern left side of positive hole or right side, send
Airduct is provided with skew T joint at dead angle position, and mouth of pipe is towards return air direction.
It is using the beneficial effect produced by above-mentioned technical proposal：The present invention realizes closing multiple using parallel heading
The ventilation in formula cavern tunneling operation face, meets the ventilation requirement of the different constructing tunnel scope of operations, is accelerated by installing jet blower additional
Return air wind speed, and exclusion to contaminated air serves guiding function, improves drafting efficiency, shortens ventilation time, increases
Forced ventilation effect, improves the utilization rate of press-in fresh air, it is ensured that the safety of staff.
Brief description of the drawings
Fig. 1 is structural representation of the invention；
Fig. 2 is double wind paths of the invention alternately supplement ventilation schematic diagram；
In figure：1st, Zheng Dong；1.1st, 1# caverns；1.2nd, 2# caverns；2nd, parallel heading；3rd, Heng Dong；3.1st, the horizontal holes of 1#；3.2nd, 2# is horizontal
Hole；4th, air door；5th, axial flow blower；6th, ajutage；7th, control for air distribution；8th, jet blower；9th, axial-flow electric fan for local ventilation；
10th, tunneling operation face；11st, main wind tube；12nd, two lining chassis；13rd, splash guard chassis；14th, air duct is replaced.
Specific embodiment
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
Embodiment 1
A kind of gas tunnel aeration structure, including positive hole 1 and parallel heading 2, positive hole 1 are connected with parallel heading 2 by horizontal hole 3,
Horizontal hole 3 is place is provided with air door 4 with one voice with positive hole 1；Positive hole 1 is made up of several caverns tunneled simultaneously, and its two ends is opening
Formula cavern, middle cavern is closed cavern, and 1# caverns 1.1,2# caverns 1.2 are named as successively, until n# caverns, each
Closed cavern is provided with the horizontal hole 3 connected with parallel heading 2, the horizontal hole 3.2 in the horizontal holes 3.1,2# of 1# is named as successively, until n#
Horizontal hole；Axial flow blower 5 is installed at the import of parallel heading 2, axial flow blower 5 is connected and by sending with the ajutage 6 for matching
Fresh air is pressed into airduct 6 the tunneling operation face 10 of each cavern of positive hole 1, is the air-supply of each cavern, dilution contaminated air warp
Horizontal hole 3 and parallel heading 2 are discharged；Control for air distribution 7 is set in the turnout position by horizontal hole 3, is realized to different caverns
The control of air output；One jet blower 8 is respectively set at the air door 4 in parallel heading 2 and horizontal hole 3, is formed by jet blower 8
Blast, accelerate guiding return air direction；In the dead angle position axial-flow electric fan for local ventilation 9 of each closed cavern in positive hole 1
The gas blowout that will assemble, discharges after being allowed to mix with return air；The dead angle position of each closed cavern in positive hole 1 is in cavern
Backbreak the positions such as serious place and cavern turning.
The present invention installs axial flow blower 5 in the import of tunnel parallel heading 2, and axial flow blower 5 is connected with ajutage 6, by sending
Fresh air is pressed into positive hole 1 by airduct 6, and dilution contaminated air is discharged outside hole through horizontal hole 3, parallel heading 2.Branch off by horizontal hole 3
Road position sets one drag two air volume distributor 7, realizes the control to different work face air output.Positive hole 1, parallel heading 2 and horizontal stroke
A jet blower 8 is respectively set at the air door 4 of hole 3, to ensure that distinguished and admirable circulation rate need to set jet blower 8, wind direction is induced.By penetrating
The negative pressure that flow fan 8 is formed, accelerates guiding return air direction.In dead angle, the position axial-flow type local ventilations such as serious, turning of backbreaking
The gas blowout that machine 9 will be assembled, discharges after being allowed to mix with return air；When gas density is more than or equal to 0.5%, blower fan will
Run at high speed, strengthen detection and ensure in hole that any place's gas density is down to less than 0.5% constructing.When mobile two serve as a contrast chassis,
Blower fan takes low-grade location air feed, to ensure the continuity of air feed.
A kind of gas tunnel aeration structure, including axial flow blower 5, ajutage 6, control for air distribution 7 and jet blower
8；Axial flow blower 5 is arranged at the import of parallel heading 2 and is connected with the ajutage 6 for matching；Ajutage 6 is along parallel heading
2 and horizontal hole 3 arrangement be connected near the rear of tunneling operation face 10 of each the closed cavern of positive hole 1；Control for air distribution 7 is set
In the turnout position near the horizontal hole 3 of axial flow blower 5 and parallel heading 2；In each closed cavern in positive hole 1, parallel heading 2
Neutralize and jet blower 8 is provided with the air door 4 in horizontal hole 3；Axial flow blower 5 is arranged on the import of parallel heading 2 outside and height is big
Return air road junction at the hole of parallel heading 2；Jet blower 8 in positive each closed cavern of hole 1 is arranged at air return section, can
Moved with formwork jumbo；The air-out port of ajutage 6 is arranged on the position for having 20 meters apart from tunneling operation face 10；Positive hole 1 each
Dead angle position in closed cavern is provided with axial-flow electric fan for local ventilation 9；Horizontal hole 3 positive hole 1 each closed cavern and
Between parallel heading 2 one is set every 300 meters；Ajutage 6 is fixedly installed on each the closed cavern left side of positive hole 1 or right side
Wall on, ajutage 6 is provided with skew T joint at dead angle position, and mouth of pipe is towards return air direction；Allocation of the amount of air is controlled
Device 7 is one drag two control for air distribution.
In work progress when pressure coal seam has been opened in Gas Outburst tunnel, a large amount of gas emissions, will lead in the short time
Gas density in closed cavern is caused drastically to raise, if quickly do not dropped in safe range gas density in hole, it is possible to send out
Raw serious accident, influences worker safety；Typically when major long tunnel excavating depth more than certain distance after, air returning ratio compared with
Difficulty, to improve ventilation condition, the present invention realizes the ventilation to multiple closed cavern's tunneling operation faces using parallel heading, full
, quickly can be down to below safe concentration gas density, with tunnel excavation by the ventilation requirement of the foot difference constructing tunnel scope of operation
The distance of the propulsion of working face, air inlet duct and air -return duct also will be increasing, and due to air return, gas and dust are dense in air intake
Degree can increase, and in order to ensure the quality of air intake of constructing, the relay drainage of jet blower 8 be installed in air return section, by installing jet wind additional
Machine 8 accelerates return air wind speed, and exclusion to contaminated air serves guiding function, it is ensured that ventilation effect, in local excavation not
Smooth-going section, dead angle, the backbreak positions such as serious, turning or easily generation local gas aggregation, using axial-flow electric fan for local ventilation 9
Air mass can be dispelled, effectively prevents local gas from assembling, discharged after the gas blowout of aggregation is allowed to mix with return air.
Moreover, the position connection oblique three that ajutage 6 is easily assembled in dead angle, the gas such as serious, turning of backbreaking
Pass joint, while mouth of pipe is towards return air direction, by its mouth of pipe submitting portion fresh air, so as to by dead angle, backbreak sternly
In the rapid dilution of gas of the positions such as weight, turning aggregation and in time remittance return air discharge air-flow.
In practice of construction, because airduct passes through two lining chassis 12, when two lining chassis 12 are moved, it is necessary to blowing-out, mobile
During two lining chassis 12, due to the inhibition of two lining chassis 12, gas easily gathers, and gathering for gas is accelerated in blowing-out；To have
Effect solving practical problems, using double wind sleeves（Road）Arrangement, one as main wind path, main wind tube 11 passes through two lining chassis 12, in addition
One used as standby wind path, the method combination axial-flow electric fan for local ventilation 9 that alternately air duct 14 is arranged immediately following two lining chassis 12 always
Ventilation；When mobile two serve as a contrast chassis 12 and must close main wind path, standby wind path is opened, while using the axial-flow type on two ride cars 12
Ventilating problem in the lining movement of chassis 12 of 9 final result of booster two.
The present invention realizes the ventilation to multiple closed cavern's tunneling operation faces using parallel heading, meets different tunnels and applies
The ventilation requirement of the work scope of operation, return air wind speed is accelerated by installing jet blower additional, and the exclusion of contaminated air is served draws
Effect is led, drafting efficiency is improve, ventilation time is shortened, strengthens ventilation effect, improve the utilization rate of press-in fresh air, protected
Demonstrate,prove the safety of staff.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or using the present invention,
Various modifications to the present embodiment will be apparent for those skilled in the art, those skilled in the art's root
Go out the product of other structures according to principle design of the invention, belong to protection scope of the present invention, the present invention will not be limited
In embodiment illustrated herein, and it is to fit to the most wide scope consistent with principles disclosed herein and features of novelty.
Claims (10)
1. a kind of gas tunnel method of ventilation, it is characterised in that：
（1）Including positive hole（1）And parallel heading（2）, the positive hole（1）And parallel heading（2）By horizontal hole（3）Connection, horizontal hole
（3）With positive hole（1）Place is provided with air door with one voice（4）；Positive hole（1）It is made up of several caverns tunneled simultaneously, its two ends is
Open cavern, middle cavern is closed cavern, and 1# caverns are named as successively（1.1）, 2# caverns（1.2）, until n#
Cavern, each closed cavern is provided with and parallel heading（2）The horizontal hole of connection（3）, the horizontal holes of 1# are named as successively（3.1）、
The horizontal holes of 2#（3.2）, until the horizontal holes of n#；
（2）In parallel heading（2）Import at install axial flow blower（5）, the axial flow blower（5）With the ajutage for matching
（6）Connect and by ajutage（6）Fresh air is pressed into positive hole（1）The tunneling operation face of each cavern（10）, it is each hole
Room is blown, and dilution contaminated air is through horizontal hole（3）And parallel heading（2）Discharge；
（3）By horizontal hole（3）Turnout position set control for air distribution（7）, realize the control to different cavern's air outputs
System；
（4）In parallel heading（2）And horizontal hole（3）Air door（4）One jet blower of each setting in place（8）, by jet blower（8）
The blast of formation, accelerates guiding return air direction；
（5）In Zheng Dong（1）Each closed cavern dead angle position axial-flow electric fan for local ventilation（9）The gas of aggregation is blown
Go out, discharged after being allowed to mix with return air.
2. a kind of gas tunnel method of ventilation according to claim 1, it is characterised in that the positive hole（1）Each closing
The dead angle position of formula cavern is the positions such as serious place and cavern turning of being backbreak in cavern.
3. a kind of gas tunnel aeration structure of the method for ventilation of gas tunnel according to claim 1, it is characterised in that including
Axial flow blower（5）, ajutage（6）, control for air distribution（7）And jet blower（8）；The axial flow blower（5）It is arranged on flat
Row base tunnel（2）Import at and with the ajutage for matching（6）It is connected；The ajutage（6）Along parallel heading（2）With horizontal hole
（3）Arrangement is connected to positive hole（1）The tunneling operation face of each closed cavern（10）Near rear；The control for air distribution
（7）It is positioned close to axial flow blower（5）Horizontal hole（3）With parallel heading（2）Turnout position；The positive hole（1）Each envelope
In enclosed cavern, parallel heading（2）Neutralize horizontal hole（3）Air door（4）Place is provided with jet blower（8）.
4. a kind of gas tunnel aeration structure according to claim 3, it is characterised in that the axial flow blower（5）It is arranged on
Parallel heading（2）It is more than on the outside of import and highly parallel heading（2）Return air road junction at hole.
5. a kind of gas tunnel aeration structure according to claim 3, it is characterised in that the positive hole（1）Each is closed
Jet blower in cavern（8）It is arranged at air return section.
6. a kind of gas tunnel aeration structure according to claim 3, it is characterised in that the positive hole（1）Each is closed
Jet blower in cavern（8）Can be moved with formwork jumbo, arrange that one used as main wind path, main wind tube using double wind paths（11）
Pass through two lining chassis（12）, one used as standby wind path in addition, immediately following two lining chassis（12）.
7. a kind of gas tunnel aeration structure according to claim 3, it is characterised in that the ajutage（6）Outlet air end
Mouth is arranged on apart from tunneling operation face（10）10~30 meters of position.
8. a kind of gas tunnel aeration structure according to claim 3, it is characterised in that the positive hole（1）Each is closed
Dead angle position in cavern is provided with axial-flow electric fan for local ventilation（9）.
9. a kind of gas tunnel aeration structure according to claim 3, it is characterised in that the horizontal hole（3）In Zheng Dong（1）
Each closed cavern and parallel heading（2）Between every 200~500 meters set one.
10. a kind of gas tunnel aeration structure according to claim 3, it is characterised in that the ajutage（6）Fixation sets
Put in Zheng Dong（1）On the wall on each closed cavern left side or right side, ajutage（6）Dead angle position is provided with skew T to connect
Head, and mouth of pipe is towards return air direction.
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| CN201710198549.XA CN106930781A (en) | 2017-03-29 | 2017-03-29 | A kind of gas tunnel method of ventilation and its structure |
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| CN201710198549.XA CN106930781A (en) | 2017-03-29 | 2017-03-29 | A kind of gas tunnel method of ventilation and its structure |
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Cited By (6)
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| CN107327310A (en) * | 2017-07-13 | 2017-11-07 | 高军 | A kind of method of ventilation of high-speed railway gas tunnel |
| CN108425698A (en) * | 2018-03-19 | 2018-08-21 | 中煤科工集团西安研究院有限公司 | Coal mine down-hole tunnel tunnels method for treating flour dust |
| CN108843368A (en) * | 2018-08-21 | 2018-11-20 | 中铁二院工程集团有限责任公司 | A kind of gas integration monitoring tapping equipment for tunnel cavern |
| CN109139081A (en) * | 2018-09-20 | 2019-01-04 | 中铁局集团第五工程有限公司 | A kind of high methane Extra Long Tunnel Construction method of ventilation |
| 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 |
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| CN108843368A (en) * | 2018-08-21 | 2018-11-20 | 中铁二院工程集团有限责任公司 | A kind of gas integration monitoring tapping equipment for tunnel cavern |
| CN109139081A (en) * | 2018-09-20 | 2019-01-04 | 中铁局集团第五工程有限公司 | A kind of high methane Extra Long Tunnel Construction method of ventilation |
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| 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 |
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Application publication date: 20170707 |