CN113446046A - Extra-long high-gas tunnel draw-out type construction ventilation system - Google Patents
Extra-long high-gas tunnel draw-out type construction ventilation system Download PDFInfo
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- CN113446046A CN113446046A CN202110786100.1A CN202110786100A CN113446046A CN 113446046 A CN113446046 A CN 113446046A CN 202110786100 A CN202110786100 A CN 202110786100A CN 113446046 A CN113446046 A CN 113446046A
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- 238000009423 ventilation Methods 0.000 title claims abstract description 70
- 238000010276 construction Methods 0.000 title claims abstract description 67
- 238000009412 basement excavation Methods 0.000 claims abstract description 68
- 238000005192 partition Methods 0.000 claims description 7
- 238000000605 extraction Methods 0.000 claims description 6
- 239000000284 extract Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 25
- 230000000903 blocking effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 206010010904 Convulsion Diseases 0.000 description 4
- 230000036461 convulsion Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005641 tunneling Effects 0.000 description 3
- 206010021143 Hypoxia Diseases 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 230000029058 respiratory gaseous exchange Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
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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
- E21F1/08—Ventilation arrangements in connection with air ducts, e.g. arrangements for mounting ventilators
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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
- E21F1/10—Air doors
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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
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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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
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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Abstract
The invention provides a drawing-out type construction ventilation system for an extra-long high-gas tunnel, which comprises a drainage tunnel, an inclined shaft, a left line, a right line, a horizontal guide, a main air inlet unit, a main air return unit and a branch ventilation unit, wherein the drainage tunnel is arranged on the left side of the inclined shaft; the main air inlet unit comprises an air inlet area, at least three fresh air fans and at least three air pipes, the air inlet area is positioned at the rear ends of the left line and the horizontal guide, the air inlet area is communicated with the inclined shaft, the fresh air fans are arranged in the air inlet area, the three fresh air fans respectively correspond to the left line, the horizontal guide and the right line, and each fresh air fan supplies fresh air to the corresponding excavation surface through the air pipe; the main air return unit comprises an air return area and an exhaust fan, the air return area is positioned at the rear end of the right line and is communicated with the drainage hole, and the exhaust fan is arranged in the drainage hole and exhausts air from inside to outside; the branch ventilation unit comprises a ventilation area, the ventilation area is located at the front ends of the left line, the right line and the flat guide, and the exhaust fan extracts the old air in the ventilation area outwards, so that the fresh air enters the ventilation area from the air inlet area. The invention separately conveys the fresh air and the old air, and has high safety.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a drawing-out type construction ventilation system for an extra-long high-gas tunnel.
Background
In some new-built extra long type double-line (two holes divide and repair) + the flat tunnel construction in recent years, a novel extra long tunnel "stage type hybrid" ventilation system scheme has been used, this scheme mainly divides to repair + the flat very long type tunnel construction organization mode of leading to the double hole, utilize the air pressure difference that the natural difference in height of tunnel inclined shaft and sluicing hole formed, combine the air wall setting through the right side line, form holistic air inlet tunnel (sluicing hole) and return air tunnel (inclined shaft), thereby reach the negative pressure formula ventilation mode of airing exhaust. During construction, a 'stage type' ventilation technology is adopted, a horizontal guide advanced left-right front line construction state is combined, the total single-head ventilation distance is divided into three sections by moving the position of the air wall for multiple times, and each section is 2-3Km, so that the effect of dynamic ventilation management of 'long tunnel short wind' in 10Km single-head tunneling is realized.
However, the ventilation system scheme is mainly used for tunnel construction in which the whole work area is in a gas-free environment and the air quantity is small, and fresh air inlet is mainly realized by air suction operation of axial flow fans arranged on each working surface on an air wall of an air chamber. Along with the tunnelling construction in tunnel, its plenum wind wall need carry out stage formula antedisplacement, though reduced axial fan's air supply distance to a certain extent like this, but can increase the distance that right line new trend got into inlet air channel, the air inlet frictional resistance also increases thereupon simultaneously, this axial fan that can lead to plenum wind wall department induced drafts extremely difficultly, leads to it to the excavation face air supply to appear the difficulty, and then leads to the air supply not enough for the security problem appears in the tunnel construction. In addition, in the ventilation system scheme, the fresh air and the old air are mixed together, so that whether the air reaching the excavation surface is the fresh air or the old air or the mixed gas of the fresh air and the old air is difficult to distinguish. Therefore, the ventilation system scheme cannot be applied to the construction of gas tunnels or high gas tunnels.
Disclosure of Invention
The invention aims to provide an extra-long high-gas tunnel extraction type construction ventilation system which separates and independently conveys fresh air and old air, is safe and efficient, and is particularly suitable for gas or high-gas tunnels.
In order to achieve the purpose, the extraction type construction ventilation system for the extra-long high-gas tunnel comprises a drainage tunnel, an inclined shaft, a left line, a right line and a horizontal guide, wherein the left line and the right line are respectively arranged on two sides of the horizontal guide, the inclined shaft is arranged on one side of the left line, the drainage tunnel is arranged on one side of the right line, excavation surfaces are respectively arranged in the left line, the right line and the horizontal guide, the extraction type construction ventilation system further comprises a main air inlet unit, a main air return unit and a branch ventilation unit, and the main air inlet unit is communicated with the main air return unit through the branch ventilation unit; the main air inlet unit comprises an air inlet area, at least three fresh air fans and at least three air pipes, the air inlet area is positioned at the rear ends of the left line and the horizontal guide, the air inlet area is communicated with the inclined shaft, the air inlet area can be expanded forwards along the construction direction, the fresh air fans are arranged in the air inlet area, the three fresh air fans respectively correspond to the left line, the horizontal guide and the right line, and each fresh air fan sends fresh air to the corresponding excavation surface through the air pipe; the main air return unit comprises an air return area and an exhaust fan, the air return area is positioned at the rear end of the right line and is communicated with the drainage hole, the air return area can be expanded forwards along the construction direction, and the exhaust fan is arranged in the drainage hole and exhausts air from inside to outside; the branch ventilation unit comprises a ventilation area, the ventilation area is located at the front end of the left line, the front end of the right line and the front end of the flat guide, the ventilation area is communicated with the air inlet area and the air return area respectively, and the old air in the ventilation area is outwards extracted by the exhaust fan, so that the fresh air enters the ventilation area from the air inlet area.
According to the scheme, the exhaust fan is arranged in the drainage hole and used for outwards extracting the old air in the tunnel, so that the fresh air enters the tunnel from the inclined shaft, the content of gas in the tunnel is reduced, the ventilation effect of tunnel construction is realized, explosion in the tunneling construction process is prevented, and the construction safety is improved; through setting up new trend fan and tuber pipe for directly carry the new trend to each excavation face through the tuber pipe, make things convenient for constructor's normal free breathing, prevent to take place the oxygen deficiency phenomenon. The invention is particularly suitable for the construction of gas or high gas tunnels, the old air in the tunnel contains gas, the exhaust fan is used for sucking away the old air containing the gas, so that enough fresh air is contained in the fresh air area, the air suction quantity of the fresh air fan is ensured to meet the design requirement, the increase of the motor operation damage rate of the fresh air fan due to the insufficient air suction quantity is prevented, the fresh air fan and the air pipe are used for conveying the fresh air, on one hand, the content of the gas in the tunnel can be reduced, on the other hand, the fresh air can not be mixed with the old air in the conveying process, the pollution of the fresh air by the gas of the old air is prevented, the supply quantity of the fresh air in the area close to an excavation surface is favorably ensured, and the safety and the high efficiency of the tunnel construction are favorably improved.
A separating part is arranged between the inclined shaft and the left line, the separating part divides the wind flow of the inclined shaft into a first flow passage and a second flow passage, the first flow passage is communicated with the rear end of the left line, and the second flow passage is communicated with the front end of the left line; the left line is internally provided with a movable air door used for adjusting the air flow at the front end and the rear end of the left line, and the movable air door is positioned at one side of the partition part.
A first cross road and a second cross road are arranged between the inclined shaft and the drainage tunnel, the first cross road is respectively communicated with the first flow passage, the left line, the right line and the horizontal guide, and the second cross road is respectively communicated with the second flow passage, the left line, the right line and the horizontal guide; a first air wall is arranged between the first cross channel and the right line, a second air wall is arranged between the first cross channel and the flat guide, and an air inlet area is formed among the first cross channel, the first air wall, the second air wall and the movable air door.
By the scheme, the fresh air is divided into two branches by arranging the first flow channel and the second flow channel, the fresh air on one branch is directly conveyed to the excavation face closest to the inclined shaft towards the left line, the other branch is gathered in the air inlet area, the fresh air fan can conveniently emit the fresh air to other excavation faces towards the left line, the flat guide excavation faces and the excavation faces towards the right line, the reasonable adjustment of the air inlet amount of the fresh air is facilitated, the air suction amount of each fresh air fan is balanced, and each excavation face is ensured to have enough fresh air.
A plurality of right cross ways are arranged between the flat guide and the right line, two ends of each right cross way are respectively communicated with the flat guide and the right line, and an air pipe positioned in the flat guide penetrates through the excavation surfaces of the right cross ways and the right line to extend; a plurality of left cross roads are arranged between the flat guide and the left line, two ends of each left cross road are respectively communicated with the flat guide and the left line, and air pipes positioned in the flat guide penetrate through the left cross roads and the excavation surface of the left line to extend; the front end of the left line, the front end of the right line, the front end of the flat guide, the right cross road and the left cross road form a ventilation area.
It is obvious by above-mentioned scheme, through setting up left cross walk and right cross walk, be favorable to accelerating tunnel construction progress on the one hand, on the other hand makes things convenient for laying of tuber pipe.
The further proposal is that one end of the drainage tunnel far away from the right line is provided with a Y-shaped air draft channel in a communicating way, and an exhaust fan is arranged at the first end of the Y-shaped air draft channel; the air return area is also provided with a standby exhaust fan which is arranged at the second end of the Y-shaped exhaust channel.
By the scheme, when the exhaust fan is overhauled or broken down, the standby exhaust fan is started, and normal and continuous operation of the tunnel construction ventilation system is guaranteed.
The method comprises the following steps that a plurality of left line excavation surfaces are arranged in a left line, a plurality of right line excavation surfaces are arranged in a right line, a flat guide excavation surface is arranged in a flat guide, and the flat guide excavation surface is ahead of all the left line excavation surfaces and the right line excavation surfaces in the construction direction; the fresh air fans are in one-to-one correspondence with the left line excavation surface, the flat guide excavation surface and the right line excavation surface respectively, and the number of the air pipes is equal to that of the fresh air fans.
The further scheme is that after the air return area is expanded forwards along the construction direction, a first wind retaining wall and a plurality of second wind retaining walls are arranged in the air return area, the first wind retaining wall is plugged at the rear end of the right line, and the second wind retaining wall is plugged between the air inlet area and the air return area.
According to the scheme, the first wind-break wall and the second wind-break wall are arranged, so that the extending direction of the return air area can be adjusted, old air in the construction area at the front end of the tunnel can be sucked away to the maximum extent, and the phenomenon that the new style in the new air area is sucked away when the new style does not reach the construction area is avoided.
The further scheme is that after the air inlet area is expanded forwards along the construction direction, the fresh air fan and the air pipe move forwards along with the air inlet area.
By above-mentioned scheme, all follow the intake zone through setting up new trend fan and tuber pipe and move forward, be favorable to reducing the length of tuber pipe, improve the transport speed of new trend.
Drawings
FIG. 1 is a block diagram of an embodiment of the present invention.
Fig. 2 is an enlarged view of the air intake area and the air return area in the embodiment of the present invention.
Fig. 3 is a structural diagram of the embodiment of the present invention expanded forward for the first time.
FIG. 4 is an enlarged view of the rear and return air regions after the first forward expansion in an embodiment of the present invention.
Fig. 5 is a structural diagram of the embodiment of the present invention after the second forward expansion.
The invention is further explained with reference to the drawings and the embodiments.
Detailed Description
Referring to fig. 1 and 2, the extraction type construction ventilation system provided by the embodiment is particularly suitable for construction of extra-long high gas tunnels, and comprises a drainage tunnel 1, an inclined shaft 2, a left line 3, a right line 4 and a horizontal guide 5, wherein the left line 3 and the right line 4 are respectively arranged on two sides of the horizontal guide 5 in parallel, the drainage tunnel 1 is positioned on one side of the right line 4 and communicated with the right line 4, and the inclined shaft 2 is positioned on one side of the left line 3 and communicated with the left line 3. Be provided with a plurality of left cross walks 6 between left side line 3 and the tie 5, a plurality of left cross walks 6 are arranged along the construction direction and are arranged, and left side line 3 leads 5 intercommunications through left cross walk 6 and tie, and right side line 4 is provided with a plurality of right cross walks 7 between the tie 5, and a plurality of right cross walks 7 are arranged along the construction direction, and right side line 4 leads 5 intercommunications through right cross walk 7 and tie.
Excavation surfaces are respectively arranged in the left line 3, the right line 4 and the flat guide 5, and in the construction direction, the excavation surface of the flat guide 5 is ahead of the excavation surface of the left line 3 and also ahead of the excavation surface of the right line 4. In order to improve the construction efficiency, the left line 3 and the right line 4 are both provided with a plurality of excavation faces, and the plurality of excavation faces are tunneled simultaneously. In fig. 1 and 2, the left line 3 is provided with two left line excavation surfaces 31, and the right line 4 is provided with two right line excavation surfaces 41.
The extraction type construction ventilation system further comprises a main air inlet unit, a main air return unit and a branch ventilation unit, wherein the main air inlet unit is communicated with the main air return unit through the branch ventilation unit, and the functions of ventilation and air exchange in the tunnel are achieved.
The main air inlet unit comprises an air inlet area 8, five fresh air fans 81 and five air pipes 82, wherein the five fresh air fans 81 convey fresh air forwards through the corresponding air pipes 82. The air inlet area 8 is located at the rear end of the left line 3 and the horizontal guide 5, the air inlet area 8 is communicated with the inclined shaft 2, and the air inlet area 8 can extend forwards along the construction direction. Fresh air fan 81 sets up in air inlet zone 8, and fresh air fan 81 sets up with each excavation face one-to-one, and fresh air fan 81's quantity equals with the quantity of tuber pipe 82, and each fresh air fan 81 is carried the new trend to the excavation face that corresponds through independent tuber pipe 82, makes things convenient for the independent tunnelling construction of each excavation face in tunnel.
In fig. 2, a triangular partition 21 is provided between the slant well 2 and the left line 3, the partition 21 dividing the passage of the slant well 2 into a first flow passage 22 and a second flow passage 23, the first flow passage 22 communicating with the rear end of the left line 3, and the second flow passage 23 communicating with the front end of the left line 3. A movable damper 32 is provided between the front end and the rear end of the left wire 3, the movable damper 32 being located on one side of the partition 21, the movable damper 32 being for adjusting the air flow rate of the front end and the rear end of the left wire 3. Because the left line 3 is directly communicated with the second flow channel 23 of the inclined shaft 2, a fresh air fan 81 is arranged between the second flow channel 23 and the left line 3, and the fresh air fan 81 conveys fresh air to the left line 3 and the left line excavation surface 31 closest to the inclined shaft 2 through an air pipe 82. The air pipe 82 is preferably arranged along one side of the left line 3, and the directional old air is discharged from the other side of the left line 3, so that the fresh air and the old air respectively have independent routes, and smooth flow channels of the fresh air and the old air are guaranteed.
A first cross road 11 and a second cross road 12 are arranged between the inclined shaft 2 and the drainage tunnel 1, the first cross road 11 is respectively communicated with a first flow passage 22, a left line 3, a flat guide 5 and a right line 4, and the second cross road 12 is respectively communicated with a second flow passage 23, the left line 3, the flat guide 5 and the right line 4. A first air wall 111 is arranged between the first cross channel 11 and the right line 4 in a sealing manner and used for cutting off the air flow of the first cross channel 11 and the right line 4, so that the fresh air is gathered on one side of the first air wall 111 facing the flat guide 5. A second air wall 112 is arranged between the first cross channel 11 and the flat guide 5 in a sealing manner and used for cutting off the air flow of the first cross channel 11 and the flat guide 5, so that the fresh air is gathered on one side of the second air wall 112 facing the first cross channel 11. In this embodiment, the air intake area 8 is formed among the first cross duct 11, the first air wall 111, the second air wall 112, and the movable damper 32.
Generally, three fresh air fans 81 are arranged in the flat guide 5, the three fresh air fans 81 are all located on one side of the second air wall 112 facing the air inlet area 8, the air duct 82 passes through the second air wall 112 and extends along the flat guide 5 towards the flat guide excavation surface 51, and the air duct 82 can also extend towards the left line excavation surface 31 and the right line excavation surface 41 respectively through the left cross duct 6 and the right cross duct 7. Because the space of the flat guide 5 is limited, all the fresh air fans 81 and all the air pipes 82 cannot be accommodated, for a right line excavation surface 41 closest to the air intake area 8, a fresh air fan 81 can be arranged in the first cross channel 11, and the air pipes 82 extending through the corners extend to the right line excavation surface 41; for a left line digging surface 31 closest to the air inlet area 8, as the inclined shaft 2 is directly communicated with the left line 3 through the second flow channel 23, a fresh air fan 81 can be directly arranged in the left line 3 and extends to the left line digging surface 31 through the air pipe 82 which extends linearly.
The main air return unit comprises an air return area 9, an exhaust fan 91 and a standby exhaust fan 92, wherein the air return area 9 is located at the rear end of the right line 4, the air return area 9 is communicated with the drainage hole 1, and the air return area 9 can extend forwards along the construction direction. One end and the right-hand member 4 intercommunication of sluicehole 1, the other end of sluicehole 1 is provided with "Y" type convulsions passageway with communicateing, and air exhauster 91 is provided with the first end of "Y" type convulsions passageway, and reserve air exhauster 92 is provided with the second end of "Y" type convulsions passageway, and air exhauster 91 and reserve air exhauster 92 homoenergetic are from inside to outside convulsions for form the negative pressure environment in the tunnel, the new trend is automatic under the effect of pressure and is got into the tunnel from inclined shaft 2. Compared with the prior art, this implementation increases the air exhauster to ensure to carry out the new trend amount of wind in the intake zone. The air return area 9 is communicated with an excavation surface, closest to the drainage tunnel 1, in the right line 4 and is used for pumping away old air near the excavation surface; meanwhile, the return air area 9 is also communicated with the second cross channel 12, so that the old air in the flat guide 5 and the left line 3 can flow to the return air area 9.
The branch ventilation unit comprises a ventilation area 10, the ventilation area 10 is located at the front end of the left line 3, the front end of the right line 4 and the front end of the horizontal guide 5, the ventilation area 10 is communicated with an air inlet area 8 and an air return area 9 respectively, and the exhaust fan 91 outwards pumps out old air containing gas in the ventilation area 10 through the air return area 9, so that new wind energy enters the ventilation area 10 from the air inlet area 8. The front end of the left line 3, the front end of the right line 4, the front end of the flat guide 5, the left cross road 6 and the right cross road 7 form a ventilation area 10, and old wind in the ventilation area 10 flows along a preset direction.
Referring to fig. 3 and 4, as the staged construction of the tunnel progresses, the air intake section 8 and the air return section 9 are expanded and extended forward in the construction direction, and the ventilation section 10 is gradually moved backward in the construction direction. Correspondingly, the fresh air fan 81 and the air duct 82 move forward following the extension of the intake area 8.
When the air intake zone 8 extends forward, a third wind-blocking wall 95 is arranged between the first flow channel 22 and the left line 3 in a blocking manner, so that fresh air only enters the tunnel from the second flow channel 23, and simultaneously, the movable wind door 32 is closed, and a second wind-blocking wall 112 between the first cross channel 11 and the second cross channel 12 and a first wind-blocking wall 111 positioned in the first cross channel 11 are reserved, so that the fresh air can only flow forward along the construction direction. In order to prevent the fresh air in the air inlet area 8 from directly flowing to the air return area 9. A first wind blocking wall 93 and a plurality of second wind blocking walls 94 are arranged in the air return area 9, the first wind blocking wall 93 is blocked at the rear end of the right line 4, attention is paid to keeping the air return area 9 communicated with the drainage tunnel 1, and the second wind blocking wall 94 is blocked in the right cross passage 7 to cut off the air flow between the air inlet area 8 and the air return area 9. At this time, the fresh air in the air intake region can only flow forward along the left line 3 and the planar guide 5. The middle part of the flat guide 5 is provided with a second air wall 112, the second air wall is positioned at the front end of the fresh air fan 81 and used for blocking fresh air from freely flowing to a ventilation area, and then the fresh air is conveyed to a corresponding excavation surface through the fresh air fan 81 positioned on one side of the second air wall 112 and the air pipe 82 penetrating through the second air wall 112. The left side line 3 is provided with three left side line excavation faces 31, except that the excavation face that is closest to the intake zone 8 carries the new trend through the new trend fan 81 that sets up in the left side line 3, other two excavation faces in the left side line 3 all carry the new trend through setting up the new trend fan 81 that leads 5 middle parts on level. The middle of the flat guide 5 is provided with four fresh air fans 81, wherein two of the fresh air fans are used for conveying fresh air to the left excavation surface 31, one of the fresh air fans is used for conveying the fresh air to the flat guide excavation surface 51, and the other fresh air fan is used for conveying the fresh air to the right excavation surface. The right line 4 is provided with two right line excavation surfaces, and the fresh air is conveyed by the fresh air fan 81 which is arranged on one side of the second wind retaining wall 94 closest to the right line excavation surface closest to the wind return area 9.
At least one left transverse channel 6 for returning air is arranged between the air inlet area 8 and the ventilation area 10, and at least one right transverse channel 7 for returning air is arranged between the air return area 9 and the ventilation area 10, so that the smooth proceeding of the returning air is ensured, and the purposes of ventilation and air exchange are achieved.
Referring to fig. 5, after completing the one-stage construction, the draw-out type construction ventilation system may be extended forward for a second time until the full line tunnel construction is completed. In the construction process of each stage, the number of the excavation faces of the left line 3 and the right line 4 can be adjusted according to actual requirements. The number of the fresh air fans 81 is adjusted according to the number of the excavation faces.
In conclusion, the exhaust fan is arranged in the drainage tunnel and used for outwards pumping out old air in the tunnel, so that fresh air enters the tunnel from the inclined shaft, the content of gas in the tunnel is reduced, the ventilation effect of tunnel construction is realized, explosion in the tunneling construction process is prevented, and the construction safety is improved; through setting up new trend fan and tuber pipe for directly carry the new trend to each excavation face through the tuber pipe, make things convenient for constructor's normal free breathing, prevent to take place the oxygen deficiency phenomenon. The invention is particularly suitable for the construction of gas or high gas tunnels, the old air in the tunnel contains gas, the exhaust fan is used for sucking away the old air containing the gas, so that enough fresh air is contained in the fresh air area, the air suction quantity of the fresh air fan is ensured to meet the design requirement, the increase of the motor operation damage rate of the fresh air fan due to the insufficient air suction quantity is prevented, the fresh air fan and the air pipe are used for conveying the fresh air, on one hand, the content of the gas in the tunnel can be reduced, on the other hand, the fresh air can not be mixed with the old air in the conveying process, the pollution of the fresh air by the gas of the old air is prevented, the supply quantity of the fresh air in the area close to an excavation surface is favorably ensured, and the safety and the high efficiency of the tunnel construction are favorably improved.
Finally, it should be emphasized that the above-described preferred embodiments of the present invention are merely examples of implementations, not limitations, and various changes and modifications may be made by those skilled in the art, without departing from the spirit and scope of the invention, and any changes, equivalents, improvements, etc. made within the spirit and scope of the present invention are intended to be embraced therein.
Claims (8)
1. The utility model provides a ventilation system is under construction in extra long type high gas tunnel pull-out type, includes sluicehole, inclined shaft, left side line, right side line and leads flatly, the left side line with the right side line is established respectively the both sides that lead flatly, the inclined shaft setting is in one side of left side line, the sluicehole sets up one side of right side line, the left side line, right side line and be provided with excavation face in the flat lead respectively, its characterized in that:
the extraction type construction ventilation system also comprises a main air inlet unit, a main air return unit and a branch ventilation unit, wherein the main air inlet unit is communicated with the main air return unit through the branch ventilation unit;
the main air inlet unit comprises an air inlet area, at least three fresh air fans and at least three air pipes, the air inlet area is positioned at the rear ends of the left line and the horizontal guide, the air inlet area is communicated with the inclined shaft, the air inlet area can be expanded forwards along the construction direction, the fresh air fans are arranged in the air inlet area, the three fresh air fans respectively correspond to the left line, the horizontal guide and the right line, and each fresh air fan supplies fresh air to the corresponding excavation surface through the air pipes;
the main air return unit comprises an air return area and an exhaust fan, the air return area is positioned at the rear end of the right line and is communicated with the drainage tunnel, the air return area can be expanded forwards along the construction direction, and the exhaust fan is arranged in the drainage tunnel and exhausts air from inside to outside;
the branch road ventilation unit is including the ventilation district, the ventilation district is located the left side line with the right side line reaches the front end that the level was led, the ventilation district respectively with the air inlet district with return air district intercommunication, the air exhauster will old wind in the ventilation district is outwards taken away, makes the new trend follow the air inlet district gets into in the ventilation district.
2. The drawing-out type construction ventilation system for the extra-long high gas tunnel according to claim 1, wherein:
a partition part is arranged between the inclined shaft and the left line, the inclined shaft is divided into a first flow passage and a second flow passage by the partition part, the first flow passage is communicated with the rear end of the left line, and the second flow passage is communicated with the front end of the left line;
the left side is provided with a movable air door used for adjusting the air flow at the front end and the rear end of the left side, and the movable air door is positioned on one side of the partition part.
3. The drawing-out type construction ventilation system for the extra-long high gas tunnel according to claim 2, wherein:
a first cross road and a second cross road are arranged between the inclined shaft and the drainage tunnel, the first cross road is respectively communicated with the first flow road, the left line, the right line and the flat guide, and the second cross road is respectively communicated with the second flow road, the left line, the right line and the flat guide;
first air wall is provided with between first cross road with the right side line, first cross road with it is provided with the second air wall to put down between leading, first cross road first air wall second air wall with form between the movable air door the air inlet district.
4. The drawing-out type construction ventilation system for the extra-long high gas tunnel according to claim 1, wherein:
a plurality of right cross channels are arranged between the flat guide and the right line, two ends of each right cross channel are respectively communicated with the flat guide and the right line, and an air pipe positioned in the flat guide penetrates through the right cross channels and extends along the excavation surface of the right line;
a plurality of left cross roads are arranged between the flat guide and the left line, two ends of each left cross road are respectively communicated with the flat guide and the left line, and air pipes positioned in the flat guide penetrate through the left cross roads and extend through the excavation surfaces of the left line;
the front end of the left line, the front end of the right line, the front end of the flat guide, the right cross road and the left cross road form the ventilation zone.
5. The drawing-out type construction ventilation system for the extra-long high gas tunnel according to claim 1, wherein:
one end of the drainage tunnel, which is far away from the right line, is provided with a Y-shaped air draft channel in a communicating manner, and the exhaust fan is arranged at the first end of the Y-shaped air draft channel;
the air return area is further provided with a standby exhaust fan, and the standby exhaust fan is arranged at the second end of the Y-shaped exhaust channel.
6. The drawing-out type construction ventilation system for the extra-long high gas tunnel according to any one of claims 1 to 5, wherein:
a plurality of left line excavation surfaces are arranged in the left line, a plurality of right line excavation surfaces are arranged in the right line, a flat guide excavation surface is arranged in the flat guide, and the flat guide excavation surface is ahead of all the left line excavation surfaces and the right line excavation surfaces in the construction direction;
the fresh air fans are in one-to-one correspondence with the left line excavation face, the flat guide excavation face and the right line excavation face respectively, and the number of the air pipes is equal to that of the fresh air fans.
7. The drawing-out type construction ventilation system for the extra-long high gas tunnel according to any one of claims 1 to 5, wherein:
and after the air return area is expanded forwards along the construction direction, a first air retaining wall and a plurality of second air retaining walls are arranged in the air return area, the first air retaining wall is plugged at the rear end of the right line, and the second air retaining wall is plugged between the air inlet area and the air return area.
8. The drawing-out type construction ventilation system for the extra-long high gas tunnel according to any one of claims 1 to 5, wherein:
when the air inlet area is expanded forwards along the construction direction, the fresh air fan and the air pipe move forwards along with the air inlet area.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN115263398A (en) * | 2022-07-06 | 2022-11-01 | 中铁二院工程集团有限责任公司 | Ventilation and drainage method based on one-way slope three-hole and inclined shaft underground tunnel |
-
2021
- 2021-07-12 CN CN202110786100.1A patent/CN113446046A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN115263398A (en) * | 2022-07-06 | 2022-11-01 | 中铁二院工程集团有限责任公司 | Ventilation and drainage method based on one-way slope three-hole and inclined shaft underground tunnel |
| CN115263398B (en) * | 2022-07-06 | 2023-09-19 | 中铁二院工程集团有限责任公司 | Ventilation and drainage method based on unidirectional slope three-hole and inclined shaft underground tunnel |
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