CN105240040A - Ventilation method of inclined shaft assisted double-hole construction - Google Patents
Ventilation method of inclined shaft assisted double-hole construction Download PDFInfo
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- CN105240040A CN105240040A CN201510724033.5A CN201510724033A CN105240040A CN 105240040 A CN105240040 A CN 105240040A CN 201510724033 A CN201510724033 A CN 201510724033A CN 105240040 A CN105240040 A CN 105240040A
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- inclined shaft
- ventilation
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
Abstract
The invention specifically relates to a ventilation method of inclined shaft assisted double-hole construction. The ventilation method comprises the following steps: A, analyzing a pollution source and determining a ventilation standard; B, designing a ventilation system; and C, calculating tunnel ventilation parameters, selecting a fan and implementing a scheme; the ventilation system in the step B is specifically as follows: an axial-flow fan is arranged at an outer hole of an inclined shaft at an inclined shaft construction phase and a phase when inclined shaft construction is completed and a tunnel portal does not communicate with the inclined shaft, and a heading-face forced ventilation pattern is adopted with an air duct extending into a working face for ventilation; at a phase when the tunnel portal communicates with the inclined shaft, the tunnel portal is communicated with the inclined shaft and a jet flow gallery ventilation pattern is adopted, and a secure tunnel and a main tunnel both serve as air intake channels, while the inclined shaft serves as an exhaust channel. The ventilation method in the inclined shaft assisted double-track construction solves a long-distance problem that single forced ventilation fails in solving, and is high in ventilation efficiency and good in effect; moreover, the ventilation time is shortened and the construction efficiency is improved, and both electricity and air ducts can be saved; in addition, maintenance is convenient.
Description
Technical field
The present invention relates to construction ventilation of tunnel technology, be specifically related to the method for ventilation that the construction of two holes assisted by a kind of inclined shaft.
Background technology
Along with the development of national economy, in railway construction, the Construction amount of major long tunnel is increasing.In constructing tunnel, bore outburst excavation be still widely adopted, because excavated section is large, and mechanization of building operation degree improves day by day, in the tunnel that the pernicious gas produced after explosion and in diesel machine operation process causes, operating environment worsens, more and more become engineering constraint progress, affect the key factor that in duration of a project and harm hole, operating personnel is healthy.
Tunnel ventilation is the critical process that drilling and blasting method builds tunnel, and the quality of this operation construction technology directly has influence on integral layout and the economic effect of constructing tunnel, is the key of engineering construction success or failure.The form of construction ventilation of tunnel has various, mainly contains duct type and ventilates and ventilation by ducts.But the ventilation in the construction of two positive hole is assisted for inclined shaft, because the construction environment in each stage is different with operating mode of constructing, takes simple pipe ventilated and simple dash all can be limited and deposit Shortcomings and irrational place.Therefore, how to solve inclined shaft assists the ventilating problem in the construction of two positive hole to be emphasis and the difficult problem of unit in charge of construction always.
Summary of the invention
In order to better solve in above-mentioned prior art existing problem, the invention provides a kind of inclined shaft and assisting method of ventilation in two positive hole construction.
In order to realize foregoing invention object, the technical solution used in the present invention is: the method for ventilation in the construction of two holes assisted by a kind of inclined shaft, comprises the following steps:
A analyzes pollution sources and determines ventilation standard;
B designs ventilation system;
C tunnel ventilation parameter calculates, selected blower fan, embodiment;
Ventilation system in described step B is specially, the non-through stage after slope construction stage and slope construction complete and between tunnel portal and inclined shaft, and arrange axial flow blower at the outer hole of inclined shaft, adopt only head forced ventilation mode, airduct extend into face-airing; Through after-stage between tunnel portal and inclined shaft, tunnel portal and inclined shaft UNICOM adopt jet flow gallery ventilation mode, and secure tunnel and main tunnel are air intake passage, and inclined shaft is air exhaust passage.
In the slope construction stage, described only forced ventilation mode is: arrange axial flow blower at the outer hole of inclined shaft, and mates airduct and go deep into the air-supply of inclined shaft work plane.
Slope construction completes, and the non-through last stage between tunnel portal and inclined shaft, and described only forced ventilation mode is: arrange and the same number of axial flow blower of tunnel inner working face at the outer hole of inclined shaft, and axial flow blower all mates airduct to be goed deep into tunnel and blow to work plane.
The through rear construction stage between tunnel portal and inclined shaft, described jet flow gallery ventilation mode is: be arranged in parallel multiple stage axial flow blower at secure tunnel hole, secure tunnel and the main tunnel transverse passage-way corresponding with an inclined shaft and nearest transverse passage-way is UNICOM from main tunnel excavation face, other transverse passage-ways are and are provided with brattice or air door and close, be provided with in secure tunnel respectively to secure tunnel and main tunnel front air-supply axial flow blower and coupling have airduct, the airduct that described axial flow blower of blowing to main tunnel front mates is through stretching to the air-supply of main tunnel front from the transverse passage-way that main tunnel front is nearest, in secure tunnel, a segment distance is provided with jet blower, its jet direction is consistent with air intake direction, jet blower is provided with in inclined shaft, its jet is square is inclined shaft hole.
Distance in described secure tunnel between jet blower is 900 meters.
In described secure tunnel, axial flow blower is arranged on the side of secure tunnel, and the length of the axial flow blower coupling airduct in described secure tunnel is 300 meters, and the hanging of described airduct is highly not less than 4.2 meters.
The upwind that described secure tunnel hole axial flow blower is positioned at outer hole is external, and is 30m-50m apart from outer hole.
The distance of the air outlet distance excavated surface of described airduct is 10-50m.
Described axial flow blower is equipped with double-cricuit supply.
In steps A, inner air flow wind speed in hole is 0.5m/s, and wind supply quantity ensures that everyone is not less than 3m3 at supplied fresh air, and described air outlet is 120m to the calculated length of drafting of work plane.
Tool of the present invention is by useful technique effect:
1. inclined shaft of the present invention assists the method for ventilation in two positive hole construction to solve the insurmountable long distance problem of simple forced ventilation, and drafting efficiency is high, effective, shortens ventilation time, improves efficiency of construction.The tunnel of usual drilling and blasting method excavation adopts forced ventilation can only reach the length of 3 kilometers, after tunnel piercing is more than 3 kilometers, only adopt forced ventilation just cannot meet construction ventilation requirement in tunnel, the use of construction ventilation method of the present invention is not by the restriction of constructing tunnel process, and change draft type according to the different situations of construction stage, make whole engineering drafting efficiency high, ventilation effect is good, shorten ventilation time, improve efficiency of construction.
2. method of ventilation power saving of the present invention, saving airduct, easy to maintenance.If adopt conventional forced ventilation, need power of fan large, airduct is many, thus cause difficult in maintenance, ventilation time is long, efficiency is low, the problems such as power consumption is large, and the present invention changes method of ventilation and saves electricity consumption, saves airduct, easy to maintenance according to the different situations in each stage.
Accompanying drawing explanation
Fig. 1 is the positive hole construction task amount schematic diagram of each service incline in embodiment of the present invention construction of tunnel;
Fig. 2 is the embodiment of the present invention tiltedly middle well construction stage ventilation schematic diagram;
Fig. 3 is non-through stage ventilation schematic diagram after slope construction completes in the embodiment of the present invention and between tunnel portal and inclined shaft;
Fig. 4 is slope construction stage inclined shaft section enlarged diagram in the embodiment of the present invention;
Fig. 5 is only through stage ventilation schematic diagram between secure tunnel hole and inclined shaft in the embodiment of the present invention;
Fig. 6 is secure tunnel and main tunnel portal through stage ventilation schematic diagram all and between inclined shaft in the embodiment of the present invention;
In the drawings, hole 6, brattice 7, work plane 8, axial flow blower 9, jet blower 10, airduct 11, fresh wind 12, transverse passage-way 13, dirty wind 14 in inclined shaft 1, main tunnel 2, secure tunnel 3, tunnel portal 4, the outer hole 5 of inclined shaft, inclined shaft.
Detailed description of the invention
Below in conjunction with accompanying drawing, by specific embodiment, the invention will be further described.Following examples are descriptive, are not determinate, can not limit protection scope of the present invention with this.
Embodiment 1
The present embodiment connects (Angren) ~ Pa cloth (Pop) railway Ku La meter tunnel 1# inclined shaft for Uzbekistan's peace leather, An Gelian (Angren) ~ Pa cloth (Pop) Railway Design speed per hour is 40km/h, main length of tunnel is 19.3km, build the secure tunnel (long 19.3km) parallel with main tunnel, main tunnel and secure tunnel center to center distance 29m simultaneously.Main tunnel is connected with adopting service channel between secure tunnel, service channel spacing 300m.Tunnel must have been built on September 1st, 2016, for meeting duration demand, arranges 3 inclined shaft auxiliary constructions.Tunnel must have been built on September 1st, 2016, for meeting duration demand, arranges 3 inclined shaft auxiliary constructions.The positive hole construction task amount of each service incline is as shown in table 1-1 and Fig. 1.
Table rummy tunnel, 1-1 storehouse each work area construction task amount and air-supply lengths table
Assist the Design of ventilation in the construction of two holes for 1# inclined shaft detailed description inclined shaft in this construction of tunnel below, wherein made detailed design to construction ventilation air quantity, blast, ventilation system layout, ventilator selection etc., its general steps is:
A analyzes pollution sources and determines ventilation standard, and wherein inner air flow wind speed in hole is 0.5m/s, and wind supply quantity ensures that everyone is not less than 3m3 at supplied fresh air, and described air outlet is 120m to the calculated length of drafting of work plane.
B designs ventilation system;
C tunnel ventilation parameter calculates, selected blower fan, embodiment;
Described ventilation system is specially, the non-through stage after inclined shaft 1 construction stage and inclined shaft 1 have constructed and between tunnel portal 4 and inclined shaft 1, and arrange axial flow blower 9 at the outer hole 5 of inclined shaft, adopt only head forced ventilation mode, airduct 11 extend into work plane 8 and ventilates; Through after-stage between tunnel portal 4 and inclined shaft 1, tunnel portal 4 and inclined shaft 1 UNICOM adopt jet flow gallery ventilation mode, and secure tunnel 3 and main tunnel 2 are air intake passage, and inclined shaft 1 is air exhaust passage.The air outlet distance work plane 8 of described airduct 11 is apart from being 10-50m.
Concrete construction sequence is:
A analyzes pollution sources and determines ventilation standard
Primary pollution source analysis in constructing tunnel, pollution sources mainly contain explosion pollution sources, mechanical contamination source, country rock release pollution sources, operating personnel's produced pollution source etc.
The standard of constructing tunnel operating environment is:
1) in tunnel oxygen content by volume percentage composition meter must not be less than 20%.
2) MAC of dust, the dust containing more than 10% free silicon dioxide in every cubic metres of air is 2mg; Dust concentration containing less than 10% free silicon dioxide in every cubic metres of air is 4mg.
3) pernicious gas maximum permissible concentration:
1. carbon monoxide maximum permissible concentration is 30mg/m
3.Under special circumstances, when constructor must enter work plane, concentration can be 100mg/m
3, but the working time must not more than 30min;
2. carbon dioxide, by volume percentage composition meter must not be greater than 0.5%;
3. nitrogen oxide (is converted into NO
2) be 5mg/m
3below;
5) in tunnel, temperature must not be greater than 28 DEG C.
6) in tunnel, noise must not be greater than 90dB.
7) wind speed of construction ventilation of tunnel should not be less than 0.5m/s.
B designs ventilation system;
See Fig. 2, in only the forced ventilation mode of inclined shaft 1 construction stage be: when inclined shaft 1 excavates, 1 SDF is set at the outer hole of inclined shaft
(B)-№ 11.5 fan shaft flow fan 9, and mate Φ 1.8m airduct 11 and go deep into inclined shaft work plane 8 and blow, airduct 11 exports air quantity 1734m
3/ min > 1640m
3/ min, meets and needs wind requirement.
See Fig. 3, Fig. 4, after inclined shaft 1 has been constructed and non-through stage between tunnel portal 4 and inclined shaft 1, this stage has importer to main tunnel 2 work plane 8, Way out main tunnel 2 work plane 8 and Way out secure tunnel 3 work plane 8 three work planes 8, importer to construct length 888m to main tunnel 2 work plane 8, Way out main tunnel 2 work plane 8 is constructed length 1902m, Way out secure tunnel 3 work plane 8 is constructed length 2122m, only head forced ventilation mode is adopted to be: to install three axial flow blowers 9 at the outer hole 5 of inclined shaft and coupling has corresponding airduct 11 to blow respectively to three work planes 8, 1 SDF
(B)-№ 13 blower fan also mates Φ 1.8m airduct 11 and blows to main tunnel 2 work plane 8 to importer, and airduct 11 exports air quantity 1963m
3/ min > 1640m
3/ min, meets and needs wind requirement, 1 SDF
(B)-№ 14 blower fan also mates Φ 1.8m airduct 11 and blows to Way out main tunnel 2 work plane 8, and airduct 11 exports air quantity 1834m
3/ min > 1640m
3/ min, meets and needs wind requirement, 1 SDF
(B)-№ 11.5 blower fan also mates Φ 1.6m airduct 11 and blows to Way out secure tunnel 3 work plane 8, and airduct 11 exports air quantity 1037m
3/ min > 651m
3/ min, meets and needs wind requirement.
See Fig. 5, through between the tunnel portal 4 and inclined shaft 1 of secure tunnel 3, and the non-through stage between main tunnel 2 tunnel portal 4 and inclined shaft 1, described tunnel portal 4 and inclined shaft 1 UNICOM adopt jet flow gallery ventilation mode to be: external in the upwind apart from the outer hole of secure tunnel 3 being 30m-50m, four axial flow blowers 9 are arranged side by side, secure tunnel 2 and main tunnel 3 transverse passage-way 13 corresponding with inclined shaft 1 and are UNICOMs from the transverse passage-way 13 that main tunnel front 8 is nearest, other transverse passage-ways 13 are and are provided with brattice 7 or air door and close, and are provided with a SDF in secure tunnel 3
(B)-№ 11 blower fan also mates Φ 1.4m airduct 11 to the air-supply of secure tunnel 3 work plane 8 and two SDF
(B)-№ 11.5 blower fan also mates Φ 1.8m airduct 11 and blows to work plane 8 respectively to main tunnel 2 Way out and importer, the described airduct 11 mated to the axial flow blower 9 of main tunnel 2 both direction work plane 8 air-supply is blown through stretching to main tunnel 2 work plane 8 from the transverse passage-way 13 that direction, main tunnel 2 work plane 8 is nearest separately, in secure tunnel 3,900 meters are provided with a jet blower 10, its jet direction is consistent with air intake direction, be provided with jet blower 10 in inclined shaft 1, its jet is square is inclined shaft hole 5; Secure tunnel 2 and the main tunnel 3 transverse passage-way 13 secure tunnel end corresponding with inclined shaft 1 arranges a jet blower 10 and regulates pressure, makes this transverse passage-way secure tunnel end form zone of positive pressure, reduces and avoid the dirty wind in main tunnel 2 to enter secure tunnel 3.
See Fig. 6, at secure tunnel 3 and through after-stage between main tunnel 2 tunnel portal 4 and inclined shaft 1, described tunnel portal 4 and inclined shaft 1 UNICOM adopt jet flow gallery ventilation mode to be: external in the upwind apart from the outer hole of secure tunnel 3 being 30m-50m, four axial flow blowers 9 are arranged side by side, secure tunnel 2 and main tunnel 3 transverse passage-way 13 corresponding with inclined shaft 1 and are UNICOMs from the transverse passage-way 13 that main tunnel front 8 is nearest, other transverse passage-ways 13 are and are provided with brattice 7 or air door and close, and are provided with a SDF in secure tunnel 3
(B)-№ 11 blower fan also mates Φ 1.4m airduct 11 to the air-supply of secure tunnel 3 work plane 8 and a SDF
(B)-№ 11.5 blower fan also mates Φ 1.8m airduct 11 and blows to main tunnel 2 work plane 8, the described airduct 11 mated to the axial flow blower 9 of main tunnel 2 work plane 8 air-supply is blown through stretching to main tunnel 2 work plane 8 from the transverse passage-way 13 that main tunnel 2 work plane 8 is nearest, in secure tunnel 3,900 meters are provided with a jet blower 10, its jet direction is consistent with air intake direction, be provided with jet blower 10 in inclined shaft 1, its jet is square is inclined shaft hole 5; In inclined shaft, hole 6 importer arranges a jet blower 10 to first transverse passage-way main tunnel 2 end, this transverse passage-way main tunnel 1 end is made to form malleation air curtain, reduce the circulation of dirty wind, secure tunnel 2 and the main tunnel 3 transverse passage-way 13 secure tunnel end corresponding with inclined shaft 1 arranges a jet blower 10 and regulates pressure, make this transverse passage-way secure tunnel end form zone of positive pressure, reduce and avoid the dirty wind in main tunnel 2 to enter secure tunnel 3.
Axial flow blower 9 in described secure tunnel 3 is arranged on the side of secure tunnel 3, and the length of described axial flow blower coupling airduct 11 is 300 meters, and the hanging of described airduct 11 is highly not less than 4.2 meters.
The distance of the air outlet distance excavated surface 8 of described airduct 11 is 10-50m.
Described axial flow blower 9 is equipped with double-cricuit supply.
C tunnel ventilation calculates
Ventilation needed for the constructing tunnel scope of operation should ventilation required for the maximum numbers simultaneously worked in tunnel, the pernicious gas that once detonation explosive charge produces is reduced to the ventilation required for allowable concentration, the pernicious gas of the diesel machine generation of operation simultaneously in tunnel is diluted to the ventilation required for allowable concentration, and get the required airflow of maximum value wherein as the constructing tunnel scope of operation, finally check by minimum wind speed.
(1) required airflow calculating parameter
The parameter of Wind Coverage Calculation is determined, in Table 3-1 according to construction scheme in tunnel.
Table 3-1 Wind Coverage Calculation parameter
(2) Wind Coverage Calculation result
1. calculate by the maximum number of operation simultaneously in hole, secure tunnel work plane 8 required airflow is 90m
3/ min, positive hole and inclined shaft work plane 8 required airflow are 150m
3/ min;
2. calculating required airflow by work plane 8 explosion smoke evacuation is: secure tunnel work plane 8 required airflow of discharging fume is 552.7m
3/ min, inclined shaft work plane 8 required airflow of discharging fume is 774m
3/ min, positive hole work plane 8 required airflow of discharging fume is 1050m
3/ min;
3. calculating required airflow by dilution engine exhaust gas is: secure tunnel rail travel does not consider diesel machine, and inclined shaft and positive hole work plane 8 required airflow are 1640m
3/ min;
4. calculating required airflow by minimum wind speed is: the minimum air quantity of secure tunnel work plane 8 is 651m
3/ min, inclined shaft and the minimum air quantity of positive hole work plane 8 are 1032m
3/ min;
According to above result of calculation: secure tunnel calculates required airflow for controlling air quantity by minimum wind speed, and secure tunnel work plane 8 required airflow is 651m
3/ min; Inclined shaft and positive hole are pressed diesel machine waste gas and are calculated required airflow for controlling air quantity, and work plane 8 required airflow is 1640m
3/ min.In addition, adopt rail travel muck removal from the positive hole work plane 8 that secure tunnel is established newly in advance, so with explosion smoke evacuation required airflow for controlling air quantity, be 1050m
3/ min.
Main ventilation equipment
The blower fan airduct configuration model in 1# inclined shaft work area and quantity are in Table 6-1.
Table 6-1 ventilation equipment allocation list
The test and repair of ventilation effect
After ventilation scheme is implemented, can the scheme implemented reach designing requirement, or whether design itself has problems, these all need by the import and export air quantity of temperature, humidity, pipeline, hundred meters of air leak rate of air curtain of pipeline, the test of the project such as flowing resistance and the change of work plane harmful gas concentration, check scheme implementation of conditions (mainly air pipeline installation quality), evaluate design scheme.Require that technician tests as early as possible, to revise in time Problems existing after scheme implementation.In addition, also require that technician carries out regular detection, to check the installation and maintenance quality of air pipeline to ventilation effect (the harmful gas concentration situation of change in groundwork face).
Must be detected on-the-spot ventilation effect by professional and technical personnel, measure the parameters such as atmospheric parameter, wind speed, air quantity, carbon monoxide, hydrogen sulfide, need if desired to measure fan performance, adjust the running status of ventilation fan according to testing result in time.
Ventilation by pipes detects: with 1.5m pibtot's tub, precision digital barometer with 10, five rings method testing conduit total head and static pressure, with ram compression distinguished and admirable in 1.5m pibtot's tub, DGM-9 type compensate-type micropressure meter test air chimney, and calculates air quantity by ram compression.
Atmospheric parameter is measured: with the inside and outside temperature of digital temperature meter testing conduit, with the humidity value of each point air pressure in aneroid barometer, wet-and-dry-bulb thermometer test tunnel.
Blasting fume and pernicious gas content measuring in tunnel: automatically record each measuring point flue dust concentration value per minute with P-5 type Digital Dust meter.TX2000 surveys carbon monoxide, nitrous oxides concentration in tunnel.Use O
2tester, H
2s tester, SO
2the concentration of oxygen, hydrogen sulfide, sulfur dioxide in tunnel surveyed by tester.Checkout equipment is in Table 8-1.
Table 8-1 ventilation checkout equipment
1# inclined shaft work area construction operation environment detection result is in shown in Table 9-1.
Table 9-11# inclined shaft work area construction operation environment detection result
As can be seen from upper table construction operation environment detection result: main hole excavation face and safe hole excavation face are all carrying out spray operation, at the bottom of safe hole excavation face and inclined shaft, all there is not CO concentration over-standard phenomenon, safe hole excavation face and main hole excavation face O
2concentration meets the demands, and excavation face near zone temperature meets the demands.
Construction ventilation safety precautions
(1) in order to ensure that ventilation fan can normally start and operate, being necessary for the power supply unit that ventilation fan provides suitable, will double-cricuit supply being equipped with by regulation.
(2) strengthen daily ventilation to detect, ensure enough air quantity and blast, and will air pipeline be cherished, avoid the destruction to air pipeline, reduce air leak rate of air curtain.
(3) hole blower fan needs to be installed in the upwind beyond distance hole 30m, avoids the circulation of dirty wind occurs; Airduct air outlet is no more than 5m apart from the distance of excavated surface.
(4) because selected dust diameter is comparatively large, must ensure that tunnel cross-section has enough headroom, avoid vehicular traffic and machinery scratch airduct and affect construction.
(5), when adopting flexible transport, the exhaust port of haulage vehicle can install purifier, to reduce the degree of contamination to construction environment in tunnel.
Pollution prevention measure
In order to reach relevant regulations and codes and standards, periodic detection must be carried out to operating environment, necessary measure must be taked simultaneously in construction to change construction environment, antipollution major measure can be taked to have:
(1) adopt wet drill, forbid to use dry drilling machine; Adopt wet drilling compared with dry drilling, the dust of 80% can be reduced.
(2) sprayed mortar adopts dampen shotcreting method, can reduce dust 85% with dampen shotcreting method than dry sprayig process.
(3) water curtain dust fall: water smoke is changed into wet water droplet and is ejected in air, make it to collide with the dust in air, then grit invests on water droplet, moist grit coacervating large particle, thus accelerates its sinking speed, thus reaches the object of dedusting.Depositing dust after explosion and in slagging tap has obvious effect.
(4) mechanical ventilation: ventilation will ensure enough air quantity, blast, air duct and substantially stands intact and hang flat, suitable, straight.Therefore, take suitable method of ventilation in construction to guarantee and reach above-mentioned target.
(5) mechanical cleaning: the oil spout effect mainly adjusting atomizer, adopts Principle of Turbosupercharger, and make oil inflame more abundant, the pernicious gas of generation is less, and installs exhaust purifier on gas emission device.
(6) personal protection: wear the security protection articles for use such as respirator by regulation.
In addition, tunnel road surface is regularly sprinkled water, when preventing vehicle operating or Blasting shock wave and cause laying dust secondary fly-up.During constructing tunnel in hole to construction machinery, as air compressor, ventilator etc. add the facilities such as noise damper.
Claims (10)
1. the method for ventilation in the construction of two holes assisted by inclined shaft, comprises the following steps:
A analyzes pollution sources and determines ventilation standard;
B designs ventilation system;
C tunnel ventilation parameter calculates, selected blower fan, embodiment;
It is characterized in that, ventilation system in described step B is specially, the non-through stage after slope construction stage and slope construction complete and between tunnel portal and inclined shaft, arranges axial flow blower at the outer hole of inclined shaft, adopt only head forced ventilation mode, airduct extend into face-airing; Through after-stage between tunnel portal and inclined shaft, tunnel portal and inclined shaft UNICOM adopt jet flow gallery ventilation mode, and secure tunnel and main tunnel are air intake passage, and inclined shaft is air exhaust passage.
2. the method for ventilation in the construction of two holes assisted by inclined shaft as claimed in claim 1, and it is characterized in that: in the slope construction stage, described only forced ventilation mode is: arrange axial flow blower at the outer hole of inclined shaft, and mates airduct and go deep into the air-supply of inclined shaft work plane.
3. the method for ventilation in the construction of two holes assisted by inclined shaft as claimed in claim 1, it is characterized in that: slope construction completes, and the non-through last stage between tunnel portal and inclined shaft, described only forced ventilation mode is: arrange and the same number of axial flow blower of tunnel inner working face at the outer hole of inclined shaft, and axial flow blower all mates airduct to be goed deep into tunnel and blow to work plane.
4. the method for ventilation in the construction of two holes assisted by inclined shaft as claimed in claim 1, it is characterized in that: the through rear construction stage between tunnel portal and inclined shaft, described jet flow gallery ventilation mode is: be arranged in parallel multiple stage axial flow blower at secure tunnel hole, secure tunnel and the main tunnel transverse passage-way corresponding with an inclined shaft and nearest transverse passage-way is UNICOM from main tunnel excavation face, other transverse passage-ways are and are provided with brattice or air door and close, be provided with in secure tunnel respectively to secure tunnel and main tunnel front air-supply axial flow blower and coupling have airduct, the airduct that described axial flow blower of blowing to main tunnel front mates is through stretching to the air-supply of main tunnel front from the transverse passage-way that main tunnel front is nearest, in secure tunnel, a segment distance is provided with jet blower, its jet direction is consistent with air intake direction, jet blower is provided with in inclined shaft, its jet is square is inclined shaft hole.
5. the method for ventilation in two positive hole construction assisted by inclined shaft as claimed in claim 4, it is characterized in that: the distance in described secure tunnel between jet blower is 900 meters.
6. the method for ventilation in two positive hole construction assisted by inclined shaft as described in claim 4, it is characterized in that: in described secure tunnel, axial flow blower is arranged on the side of secure tunnel, the length of the axial flow blower coupling airduct in described secure tunnel is 300 meters, and the hanging of described airduct is highly not less than 4.2 meters.
7. the method for ventilation in two positive hole construction assisted by inclined shaft as claimed in claim 1, it is characterized in that: the upwind that described secure tunnel hole axial flow blower is positioned at outer hole is external, and is 30m-50m apart from outer hole.
8. the method for ventilation in two positive hole construction assisted by the inclined shaft as described in claim 1,2,3 or 4, it is characterized in that: the distance of the air outlet distance excavated surface of described airduct is 10-50m.
9. the method for ventilation in two positive hole construction assisted by inclined shaft as claimed in claim 1, it is characterized in that: described axial flow blower is equipped with double-cricuit supply.
10. the method for ventilation in two positive hole construction assisted by inclined shaft as claimed in claim 1, it is characterized in that: in steps A, inner air flow wind speed in hole is 0.5m/s, wind supply quantity ensures that everyone is not less than 3m3 at supplied fresh air, and described air outlet is 120m to the calculated length of drafting of work plane.
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| CN106014468A (en) * | 2016-07-07 | 2016-10-12 | 长安大学 | Double-hole complementary vertical/inclined shaft ventilation system for expressway tunnel |
| CN108087012A (en) * | 2017-12-25 | 2018-05-29 | 中矿金业股份有限公司 | A kind of mine skip shaft outgoing airflow shuts off partition apparatus |
| CN108266215A (en) * | 2018-01-30 | 2018-07-10 | 中蓝长化工程科技有限公司 | A kind of energy saving mine ventilation method of air feed on-demand at times |
| CN108625860A (en) * | 2018-04-03 | 2018-10-09 | 中国建筑第八工程局有限公司 | The constructing structure and its construction method of Tunneling by mining method transverse passage-way |
| 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 |
| CN110525454A (en) * | 2019-08-30 | 2019-12-03 | 中车大连机车车辆有限公司 | A kind of state automatic identification method that diesel locomotive passes through tunnel |
| CN113530564A (en) * | 2021-07-21 | 2021-10-22 | 四川农业大学 | Design method and system for high-altitude railway tunnel portal emergency rescue station |
| CN113530564B (en) * | 2021-07-21 | 2023-03-31 | 四川农业大学 | Design method and system for high-altitude railway tunnel portal emergency rescue station |
| CN113685219A (en) * | 2021-08-31 | 2021-11-23 | 中铁二院工程集团有限责任公司 | Tunnel press-in type ventilation relay system |
| CN113931655A (en) * | 2021-10-08 | 2022-01-14 | 贵州省公路工程集团有限公司 | Relay press-in type and roadway type combined ventilation system |
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