CN206668313U - The gas drainage system and tunnel structure in a kind of tunnel - Google Patents
The gas drainage system and tunnel structure in a kind of tunnel Download PDFInfo
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- CN206668313U CN206668313U CN201720411257.5U CN201720411257U CN206668313U CN 206668313 U CN206668313 U CN 206668313U CN 201720411257 U CN201720411257 U CN 201720411257U CN 206668313 U CN206668313 U CN 206668313U
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- drainage system
- under suction
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Abstract
The utility model discloses a kind of gas drainage system in tunnel, it includes conductance tunnels and tunnels terminal anterior position and extraneous gas drainage under suction duct, the air extractor for being arranged on outside tunnel and being connected with the gas drainage under suction duct and the sealing device for sealing in the gas drainage under suction duct and air extractor in junction realization.Terminal anterior position and the external world are tunneled by conductance tunnels, gas is extracted out and discharged before tunnel piercing to gas accumulation region, the security incident that effectively can be prevented and treated gas accumulation and occur.
Description
【Technical field】
It the utility model is related to the gas drainage system and tunnel structure in constructing tunnel field, more particularly to gas tunnel.
【Background technology】
Gas refers to the general name of the various pernicious gases overflowed out of coal (rock) layer, and its main component is methane, titanium dioxide
Carbon, the sometimes gas such as also a small amount of sulfur dioxide, hydrogen sulfide, carbon monoxide.Gas is a kind of odorless gas of colorless and odorless,
But sometimes due to hydrocarbon and trace hydrogen sulfide in association, the fragrant special odor of similar apple, its relative density can be sent
For 0.554, gas is slightly soluble in water, there is very strong diffusivity and permeability, and gas has flammability and explosivity.According to《Railway
Gas tunnel technical specification》Regulation, gas tunnel are divided into three kinds of present low gas tunnel, high methane tunnel and Gas Outburst tunnel, watt
The type in this tunnel is determined by the highest level in gas work area in tunnel.Gas tunnel work area is divided into non-gas work area, present low gas
Work area, high methane work area, Gas Outburst work area supply four classes.Present low gas work area and high methane work area can be by the absolute Gas amounts of going
Judged.When the gas emission in full work area is less than 0.5m3It is present low gas work area, more than or equal to 0.5m during/min3/min
When, it is high methane work area.As long as gas tunnel has outburst danger at one, the place work area be Gas Outburst work area.
At present, the preventing and treating of gas is main in gas tunnel is carried out by the way of being divulged information in closure integrating tunnel, and its is main
Measure includes：First, tunnel-liner is using the coiled material loopfuls such as waterproof layer closing sealing, gas；2nd, it is impervious to improve lining concrete
Energy；3rd, forced ventilation is implemented according to gas density in tunnel.Prevent because existing tunnel mainly carries out gas by the way of stifled
Control, the methane gas of lining cutting behind, only extremely micro part is drawn by the discharge structure of infiltration and existing tunnel, and
Substantial amounts of gas actually gathers behind in lining cutting, causes lining cutting behind hydraulic pressure and gas pressure to be gone up, invades tunnel normal operation
Space produces potential safety hazard even accident.And the gas drawn by existing tunnel discharge structure, aqueous vapor is mixed in discharge structure
Close, longitudinally circulated entirely in tunnel bottom, although only micro, also actually add the risk of gas effusion.
【Utility model content】
The purpose of this utility model be to provide a kind of gas tunnel reclaimed water, qi leel from remove gas in gas work area
Gas drainage system, to solve the problems, such as the gas preventing and control after tunnel piercing and operation.
A further object of the present utility model is in the tunnel structure in a kind of massif applied to gas accumulation is provided.
To realize the purpose, the utility model adopts the following technical scheme that：
A kind of gas drainage system in tunnel, it includes conductance tunnels driving terminal anterior position and extraneous gas drainage under suction
Duct, the air extractor for being arranged on outside tunnel and being connected with the gas drainage under suction duct and by the gas drainage under suction duct with taking out
Device of air realizes the sealing device of sealing in junction.
Further, the tunnel port in the gas drainage under suction duct is located at the front of the tunnel piercing terminal, mountain table end
Mouth is located at the mountain table nearest apart from the tunnel piercing terminal.
Specifically, the air extractor connects at the mountain table port in the gas drainage under suction duct.
Optionally, the sealing device is by least one of cement mortar, cushion rubber hole packer or polyurethane sealing of hole material
It is made.
Further, gas drainage under suction duct tetrad, the tunneling direction for defining tunnel is longitudinal direction, described in same group
Gas extraction hole is in the same cross section relative to tunnel.
Optionally, it is parallel to each other between the gas drainage under suction duct of same group of gas drainage system.
Optionally, the gas drainage under suction duct of same group of gas drainage system be in from tunnel piercing terminal anterior position to
The fan-shaped laying of mountain table diverging.
Specifically, the air extractor includes gas suction pump, the mountain table port in the insertion gas drainage under suction duct is taken out
Put steel pipe and connect the extraction pipeline of the extraction steel pipe and the gas suction pump.
Optionally, the tunnel port in the gas drainage under suction duct is located in front of the tunnel piercing terminal 3 meters -5 meters.
A kind of tunnel structure, it uses gas drainage system in above-mentioned technical proposal.
Further, in addition to be laid in the tunnel inverted arch both sides drainage pipeline.
Specifically, also including the ring french drain of array arrangement, the both ends of the ring french drain connect with the drainage pipeline.
Referring now to prior art, the beneficial effects of the utility model are：In gas accumulation region, by from apart from tunnel digging
Enter the nearest mountain epitope of terminal and put to drill through the gas drainage under suction duct that tunnel port is located in front of the tunnel piercing terminal, and utilize
Air extractor carries out extraction to the gas in gas accumulation region, and before tunnel piercing to gas accumulation region, gas is arranged in advance
Go out, effectively this caused security incident of preventing and treating invar.
Meanwhile gas drainage under suction duct is put from mountain epitope and drilled through, the gas of its extraction can be directly discharged to the ring of tunnel outer
In border, job site will not be impacted.
In addition, by preliminary bracing, secondary lining and the gas drainage system positioned at tunnel piercing terminal, tunnel is realized
Gas drainage under suction problem and ponding emission problem in tunneling process, realize the separating treatment of aqueous vapor.Accordingly, it is capable to effectively avoid gas
And underground water gathering in lining cutting behind, avoid caused by lining cutting behind hydraulic pressure and gas pressure are gone up potential safety hazard very
To accident；Secondly, gas is discharged through drawing-off gas pipe, can effectively be reduced the gas density of lining cutting behind, be avoided methane gas from entering
Enter discharge structure, effectively reduce the effusion risk of gas, thus, it is possible to which tunnel piercing and the gas built up after operation is effectively ensured
Preventing and treating.
【Brief description of the drawings】
Fig. 1 is gas drainage system provided by the utility model and the cross-sectional view of tunnel structure；
Fig. 2 is the schematic perspective view of the tunnel structure in tunneling construction provided by the utility model；
Fig. 3 is longitudinal schematic cross-sectional view of tunnel structure provided by the utility model.
【Embodiment】
The utility model is further described with exemplary embodiment below in conjunction with the accompanying drawings, wherein identical in accompanying drawing
Label all refers to identical part.In addition, if it is known that the detailed description of technology is for showing feature of the present utility model
It is unnecessary, then is omitted.
As shown in figure 1, the one of which embodiment of tunnel structure provided by the utility model, including：Gas drainage system,
Drainage pipeline 4, ring french drain 5, preliminary bracing 6, secondary lining 7, inverted arch 9 and tunnel cavity 10；The gas drainage system bag
Include air extractor 1, gas drainage under suction duct 2 and sealing device 3；The preliminary bracing 6 is steelframe supporting, positioned at tunnel outer layer；Institute
The concreting that secondary lining 7 is air-tightness is stated, positioned at the inner side of the preliminary bracing 6；The inverted arch 9 and the secondary lining
7 relative layings are built, and the tunnel cavity 10 is crossed jointly with the secondary lining 7；The tunneling direction in tunnel is relative to level
Face has 5/1000ths degree of inclination angle.The drainage pipeline 4 is laid in the both sides of the inverted arch 9 in tunnel, and along tunnel piercing direction
Through whole piece tunnel；The boundary for being laid in the secondary lining 7 and the preliminary bracing 6 of the array of ring french drain 5 arrangement
Side, its both ends connect with the drainage pipeline 4.During tunneling construction and tunnel are runed, the ponding in massif 8 passes through described
Ring french drain 5 converges in the drainage pipeline 4, and discharges tunnel.
Refering to Fig. 1 and Fig. 2, in the one of which embodiment of gas drainage system provided by the utility model, it includes taking out
Device of air 1, gas drainage under suction duct 2 and sealing device 3, the air extractor 1 include gas suction pump 11, extraction pipeline 12 and taken out
Steel pipe 13 is put, the gas drainage under suction duct 2 includes hole body, mountain table port 21 and tunnel port 22, and the gas extraction hole
The tunnel port 22 in road 2 is located at the front of tunnel piercing terminal, and the mountain table port 11 is located at apart from the tunnel piercing terminal
Nearest mountain table 81.The sealing device 3 is made by least one of cement mortar, cushion rubber hole packer and polyurethane sealing Porous materials
Into.Wherein, the tunnel piercing terminal be the progress with tunneling construction and dynamic change.
In tunnel excavating process, when detecting gas emission or running into Gas Outburst work area domain, stop tunneling construction, enter
Row gas drainage under suction is constructed；In the nearest mountain table drilling of distance driving terminal, gas drainage under suction duct 2 is drilled out, the gas drilled out
The tunnel port 22 in extraction duct 2 is located at about 3 meters to 5 meters of the front of the tunnel piercing terminal, and quantity is generally 4；Connect
The hole body enlarged-diameter that will be close to mountain table port 11 to 100-120mm, insertion diameter 70-80mm extraction steel pipe 13, use is close
The sealing of hole of seal apparatus 3, the sealing device 3 can use cement mortar to use cushion rubber hole packer or polyurethane sealing of hole, and sealing is deeply
Degree is depending on the table near ports rock property of mountain, 2-3m when country rock is firm, 6-7m when country rock is soft, or even 10m or so, sealing of hole
Afterwards, it is necessary to the composition such as bend pipe, automatic water drainage device, flowmeter, armored hose (or anti-static plastic flexible pipe), gate before extraction
Extraction pipeline 12 the gas drainage under suction duct 2 and the gas suction pump 11 are connected；Finally, according to the pipe laid
Road calculates and selects suitable gas suction pump 11.The extraction work of gas is carried out, once institute's extraction watt was detected every 10 minutes
This concentration, extraction can be stopped after concentration continues 20 minutes to be less than 1.0%, and continue tunneling construction.
During using gas in the extraction massif 8 of gas drainage under suction duct 2, the aperture in gas drainage under suction duct 2, the depth in hole
Degree, extraction pipeline length, the frictional resistance of extraction pipeline, gas flow etc. can influence the extraction resistance of gas drainage system in hole
Power, and then influence drainage efficient and effect.Therefore, in gas drainage system, the depth and hole interior diameter one in gas drainage under suction duct
As need combine specifically used environment, demand and by calculate obtain.Generally, the depth in the gas drainage under suction duct is not
It should be greater than 60m.Therefore it is primarily adapted for use in the less shallow tunnel of Shangfang Mountain body thickness.The accumulation rule of gas and mountain in massif
The factors such as body structure, geology are related, and the factor that the structure of same massif, geology etc. influence gas accumulation regional location is constant, because
The gas accumulation region run into this tunnel excavating process, by the region that gas is easily assembled during being still tunnel operation.
Fig. 3 shows the longitudinal sectional view of the tunnel structure.The gas drainage under suction duct 2 that gas accumulation region drills through
Continue to tunnel with tunnel, and be changed into from the duct that mountain table is extended on the outside of Tunnel, and remain in massif
In., can also be right again by the gas drainage under suction duct 2 if gas is assembled in bore position again during tunnel operation
The gas in these regions carries out extraction, is assembled with the gas during preventing tunnel operation in massif on the outside of tunnel.
Although having been illustrated with some exemplary embodiments of the present utility model above, those skilled in the art will
Understand, in the case where not departing from principle or spirit of the present utility model, these exemplary embodiments can be made a change, this
The scope of utility model is limited by claim and its equivalent.
Claims (12)
1. a kind of gas drainage system in tunnel, it is characterised in that it includes conductance tunnels driving terminal anterior position and the external world
Gas drainage under suction duct, the air extractor for being arranged on outside tunnel and being connected with the gas drainage under suction duct and the gas is taken out
The sealing device of sealing is realized in junction in discharge hole road with air extractor.
2. gas drainage system according to claim 1, it is characterised in that the tunnel port position in the gas drainage under suction duct
In the front of the tunnel piercing terminal, mountain table port is located at the mountain table nearest apart from the tunnel piercing terminal.
3. gas drainage system according to claim 2, it is characterised in that the air extractor is in the gas extraction hole
Connected at the mountain table port in road.
4. gas drainage system according to claim 3, it is characterised in that the sealing device is by cement mortar, cushion rubber
At least one of hole packer or polyurethane sealing of hole material are made.
5. gas drainage system according to claim 2, it is characterised in that gas drainage under suction duct tetrad, it is fixed
The tunneling direction in adopted tunnel is longitudinal direction, and gas extraction hole is in the same cross section relative to tunnel described in same group.
6. gas drainage system according to claim 5, it is characterised in that the gas of same group of gas drainage system
Extraction is parallel to each other between duct.
7. gas drainage system according to claim 5, it is characterised in that the gas of same group of gas drainage system
Extraction duct is in the fan-shaped laying dissipated from tunnel piercing terminal anterior position to mountain table.
8. gas drainage system according to claim 1, it is characterised in that the air extractor include gas suction pump,
Insert the extraction steel pipe of the mountain table port in the gas drainage under suction duct and connect the extraction steel pipe and the gas suction pump
Extraction pipeline.
9. gas drainage system according to claim 1, it is characterised in that the tunnel port position in the gas drainage under suction duct
3 meters -5 meters in front of the tunnel piercing terminal.
10. a kind of tunnel structure, it is characterised in that it uses the gas drainage system as described in claim 1-9 is any.
11. tunnel structure according to claim 10, it is characterised in that also include the inverted arch both sides for being laid in the tunnel
Drainage pipeline.
12. tunnel structure according to claim 11, it is characterised in that also include the ring french drain of array arrangement, it is described
The both ends of ring french drain connect with the drainage pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720411257.5U CN206668313U (en) | 2017-04-18 | 2017-04-18 | The gas drainage system and tunnel structure in a kind of tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720411257.5U CN206668313U (en) | 2017-04-18 | 2017-04-18 | The gas drainage system and tunnel structure in a kind of tunnel |
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| CN206668313U true CN206668313U (en) | 2017-11-24 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106979031A (en) * | 2017-04-18 | 2017-07-25 | 中交路桥华南工程有限公司 | The gas drainage system and tunnel structure in a kind of tunnel |
| CN109869189A (en) * | 2019-03-22 | 2019-06-11 | 云南建投基础工程有限责任公司 | A kind of tunnel pernicious gas and underground moisture are from exhaust system device |
| CN111396049A (en) * | 2020-03-23 | 2020-07-10 | 中国矿业大学(北京) | Safe and environment-friendly rock blasting device and method |
| CN112943349A (en) * | 2021-04-15 | 2021-06-11 | 中铁九局集团第七工程有限公司 | Comprehensive management construction method for gas of high-gas tunnel |
-
2017
- 2017-04-18 CN CN201720411257.5U patent/CN206668313U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106979031A (en) * | 2017-04-18 | 2017-07-25 | 中交路桥华南工程有限公司 | The gas drainage system and tunnel structure in a kind of tunnel |
| CN109869189A (en) * | 2019-03-22 | 2019-06-11 | 云南建投基础工程有限责任公司 | A kind of tunnel pernicious gas and underground moisture are from exhaust system device |
| CN111396049A (en) * | 2020-03-23 | 2020-07-10 | 中国矿业大学(北京) | Safe and environment-friendly rock blasting device and method |
| CN112943349A (en) * | 2021-04-15 | 2021-06-11 | 中铁九局集团第七工程有限公司 | Comprehensive management construction method for gas of high-gas tunnel |
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