CN115306461A - Ventilation and cooling method for high-ground-temperature tunnel construction - Google Patents
Ventilation and cooling method for high-ground-temperature tunnel construction Download PDFInfo
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- CN115306461A CN115306461A CN202210831761.6A CN202210831761A CN115306461A CN 115306461 A CN115306461 A CN 115306461A CN 202210831761 A CN202210831761 A CN 202210831761A CN 115306461 A CN115306461 A CN 115306461A
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- 238000009423 ventilation Methods 0.000 title claims abstract description 81
- 238000001816 cooling Methods 0.000 title claims abstract description 80
- 238000010276 construction Methods 0.000 title claims abstract description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 42
- 238000009412 basement excavation Methods 0.000 claims abstract description 25
- 238000005507 spraying Methods 0.000 claims abstract description 20
- 230000000694 effects Effects 0.000 claims abstract description 14
- 238000005273 aeration Methods 0.000 claims abstract description 12
- 239000011435 rock Substances 0.000 claims description 35
- 238000013461 design Methods 0.000 claims description 17
- 239000002893 slag Substances 0.000 claims description 11
- 239000007921 spray Substances 0.000 claims description 9
- 230000036541 health Effects 0.000 claims description 6
- 230000017525 heat dissipation Effects 0.000 claims description 6
- 238000005728 strengthening Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 238000005422 blasting Methods 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 230000003203 everyday effect Effects 0.000 claims description 3
- 239000003595 mist Substances 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 238000005286 illumination Methods 0.000 claims description 2
- 230000009467 reduction Effects 0.000 claims description 2
- 239000000498 cooling water Substances 0.000 claims 1
- 239000002360 explosive Substances 0.000 description 3
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- 238000000605 extraction Methods 0.000 description 2
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- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 description 1
- 208000005156 Dehydration Diseases 0.000 description 1
- 206010047700 Vomiting Diseases 0.000 description 1
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- 230000009286 beneficial effect Effects 0.000 description 1
- 230000034994 death Effects 0.000 description 1
- 231100000517 death Toxicity 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
- E21F1/006—Ventilation at the working face of galleries or tunnels
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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
- E21F3/00—Cooling or drying of air
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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Abstract
The invention discloses an aeration cooling method for high-ground-temperature tunnel construction, which comprises three schemes of high-ground-temperature section enhanced aeration cooling, ice making block local cooling and water spraying cooling, wherein one or more of the three schemes of the high-ground-temperature section enhanced aeration cooling scheme, the ice making block local cooling scheme and the water spraying cooling scheme can be selected according to requirements. The high-ground-temperature-section construction ventilation scheme is divided into two stages, a press-in ventilation scheme is adopted in the first stage, a relay press-in ventilation scheme is adopted in the second stage, the air ventilation speed in the tunnel is accelerated, the effects of improving the operation environment and reducing the temperature of the operation surface are achieved, 2 5.5kW ventilators are additionally arranged on the excavation trolley, the lower portion of the inverted arch, the hanging plate trolley and the two lining trolleys respectively, the local air flow speed is enhanced, and the operation environment of workers is improved. The spraying surface is ensured to be moist, and the temperature is not increased any more, thereby achieving the purpose of cooling.
Description
Technical Field
The invention belongs to the technical field of tunnel cooling, and particularly relates to a ventilation cooling method for high-ground-temperature tunnel construction.
Background
With the rapid development of national infrastructure, more and more plateau mountain tunnels are planned and constructed, the construction faces the environmental characteristics of steep plateau shapes, strong plate activities, frequent geological disasters, fragile ecological environments, severe weather conditions and the like, the distribution range of high ground temperature along the line is wide, the sections are long, the temperature difference inside and outside the tunnel is large, and the construction method has the difficulties of high construction difficulty, high construction cost, high safety risk, serious construction efficiency reduction, few effective measures for construction prevention and control and the like.
The high ground temperature unfavorable geology of tunnel brings very adverse effect for tunnel construction, operation. In the high-temperature, high-humidity and low-oxygen operation environment, personnel cannot normally perform construction operation, and dehydration, vomiting, dizziness, anoxic shock and the like are easy to occur. The hot water and hot air sprayed suddenly can cause injuries and deaths of construction machines and people, and meanwhile, the working efficiency and the service life of mechanical equipment in the environment are seriously damaged. High ground temperature can also influence the stability of surrounding rocks, and high ground temperature fluid (gas, liquid) mostly exists along the compact zone of joint, migration, because of its long-term activity, will certainly increase the joint of basement rock or widen the joint width, cause the decomposition deformation once more of rock to influence the stability of tunnel surrounding rocks. Meanwhile, the explosive generates the phenomena of expansion and melting under the high-temperature and hot water soaking environment, and generates irritant ammonium nitrate smell after melting, thereby causing great harm to human bodies. And then, initiating devices such as a detonating tube, a detonator and the like can be normally used only within a certain temperature range, and the explosive can fail to work under the high ground temperature environment, so that the explosive is rejected to cause potential safety hazards. The high ground temperature is also extremely unfavorable to the stress of the two-lining structure, the concrete is easy to generate temperature stress in a high-temperature environment, and after the tunnel is formed, the dry and hard concrete is easy to crack, so that the tunnel safety is influenced.
At present, in the conventional high-ground-temperature tunnel construction, the power of a fan is simply increased, multi-person alternate construction is adopted, the construction method is simple and lagged behind, the construction period is long, the cost is high, and the safety risk is extremely high.
Disclosure of Invention
Aiming at the problems, the invention provides a ventilation and cooling method for high-ground-temperature tunnel construction, which solves the problems that the conventional high-ground-temperature tunnel construction is simple and lagged, the construction method is long in construction period, high in cost and extremely high in safety risk because the fan power is simply increased and the construction is carried out by adopting multi-person rotation.
The technical scheme of the invention is as follows: an aeration cooling method for high-ground-temperature tunnel construction comprises the following steps:
s1: original tunnel ventilation design: and 2 132kW & lt2 & gt ventilators are arranged on the support at a certain height which is not more than 30m away from the inclined shaft hole, and fresh air is supplied to the working surface of the main tunnel by utilizing the ventilating pipe with the diameter of 1.5 m.
S2: and (3) strengthening ventilation and cooling in a high ground temperature section: on the basis of the original tunnel ventilation design, a two-stage scheme is adopted for ventilation and cooling, and the axial flow fan is increased for increasing the mileage to accelerate the air circulation of the tunnel face.
A1: the first stage ventilation scheme adopts press-in ventilation, and the main scheme is as follows: 2 132kW 2 ventilators are installed at the inclined shaft hole, and fresh air is supplied to the inclined shaft intersection by using the ventilation pipe with the diameter of 1.5m, so that the wind resistance of the long inclined shaft section is favorably reduced.
A2: the second stage ventilation scheme adopts relay press-in type ventilation, and the main scheme is as follows: 2 132kW 2 ventilators are installed at the inclined shaft intersection, the air pipe that the entrance to the cave entrance input utilizes the diameter to be 1.5m ventilation pipe to the face supply fresh air to along with the corresponding quantity that increases ventilator and efflux fan of the propulsion of excavation, reduce the windage, accelerate tunnel cave air circulation speed, thereby reach the effect that improves the operational environment, reduces the operation face temperature.
S3: local cooling for ice making: the self-made ice blocks are stacked to the positions near an excavation rack, an inverted arch, a hanging plate trolley, a two-lining trolley and a working rack on the foundation construction site of the original tunnel ventilation design, and the temperatures near the working rack and the working rack are reduced when the ice blocks absorb heat.
S4: sprinkling water for cooling: on the basis of the original tunnel ventilation design, two water sprinkling and cooling measures are adopted for preventing the safety and health of operating personnel from being damaged by terrestrial heat, improving the construction environment in a tunnel and improving the working efficiency.
B1: and (3) sprinkling water on the excavated surface for cooling: a water channel with the diameter of phi 100 and special watering and cooling functions is laid at the intersection to the position near the tunnel face, a water outlet is formed in each 50m, a high-pressure spray head with the diameter of 5cm is installed, a water inlet pipe is connected to spray and cool the excavation face, a dust falling effect is achieved, after tunnel excavation blasting is conducted, water is sprayed and cooled on newly excavated exposed rock residues and rock faces immediately, the temperature of the rock residues is reduced, a large amount of heat dissipation of the rock residues and the rock faces to the air is slowed down, and heat sources are reduced.
B2: primary support and lining surface sprinkling and cooling: in high and low temperature areas, cold water is sprayed to the primary support and the lining surface by using a high-pressure spray head of each 50m of a special water spraying pipeline, the spraying surface is guaranteed to be moist, the temperature does not rise any more, the purpose of cooling is achieved, a plurality of spraying devices are additionally arranged in the tunnel along the side wall of the tunnel in a spraying cooling measure, and high-pressure air atomized water is used for forming water mist to reduce the high temperature in the tunnel.
Preferably, the S2 high-ground-temperature-section reinforced aeration cooling scheme, the S3 ice-making block local cooling scheme and the S4 sprinkling cooling scheme can be implemented on the basis of the S1 original tunnel aeration design.
Preferably, in S1 original tunnel ventilation design, the ventilation pipe is arranged in the middle of the top of the auxiliary tunnel section, the front tunnel section is arranged on the opposite side of the cable and the lighting line, and the distance between the ventilation air outlet and the excavation working face is not more than 15m.
Preferably, in the S2 high-ground-temperature section enhanced ventilation and temperature reduction process, the power of a forced ventilator at a ventilation hole opening in the enhanced hole is 2 multiplied by 110kW, the air volume is 1550 to 912m3/min, the air pressure is 860 to 5355Pa, the diameter of an air pipe connected with the forced ventilator is 1.5m, and the air pipe is connected to the position near the tunnel face.
Preferably, when the ventilation in the tunnel of the tunnel mouth fan exceeds 2 kilometers in the S2 high ground temperature section enhanced ventilation and temperature reduction process, a second ventilator is arranged at a position 40-60 meters away from the end of the air pipe of the tunnel mouth fan to supply air into the tunnel, an extraction type ventilator is arranged in the two lining sections and close to the end of the tunnel face, the power of the ventilator is 2 multiplied by 110kW, the air quantity is 1550-2912 m3/min, the air pressure is 860-5355 Pa, the diameter of the air pipe connected with the ventilator is 1.5m, and the air pipe is connected to the outside of the tunnel to absorb the hot air in the tunnel out of the tunnel.
Preferably, S2 high ground temperature section is strengthened ventilating and is set up local ventilation in the cooling, respectively increases 2 5.5kW ventilators on excavation platform truck, invert lower part, link plate platform truck and two lining platform trucks, strengthens local wind current speed, improves workman' S operational environment.
Preferably, 10 ice making machines are arranged in the local cooling of the S3 ice making block, and each work area single working surface is planned to use 4m ice making machines every day 3 And (4) ice blocks.
Compared with the prior art, the invention has the beneficial effects that:
1. the ventilation scheme of the construction at the high ground temperature section is divided into two stages, the first stage adopts a press-in ventilation scheme, the second stage adopts a relay press-in ventilation scheme, the air ventilation speed in the tunnel is accelerated, the effects of improving the working environment and reducing the working surface temperature are achieved, 2 5.5kW ventilators are respectively added to the excavation trolley, the lower part of the inverted arch, the hanging plate trolley and the two lining trolleys, the local air flow speed is enhanced, and the working environment of workers is improved.
2. The ice cubes self-made on site are stacked to the positions near the excavation rack, the inverted arch, the hanging plate trolley, the two-lining trolley and the face, and therefore when the ice cubes absorb heat, the temperature of the face and the position near the working rack is reduced.
3. In order to prevent the safety and health of operators from being damaged by the terrestrial heat, improve the construction environment in a tunnel and improve the working efficiency, two water spraying and cooling measures adopted by the project department are used for spraying water to cool the newly excavated rock slag and rock surface, reducing the temperature of the rock slag, slowing down the great heat dissipation of the rock slag and the rock surface to the air, reducing the heat source, effectively reducing the temperature of the air in the tunnel, creating conditions for optimizing the working environment, ensuring that the spraying surface is moist and the temperature does not rise any more, thereby achieving the purpose of cooling.
Drawings
FIG. 1 is a schematic view of a slant well work area forced draft arrangement of the present invention;
fig. 2 is a schematic structural view of the enhanced ventilation of the present invention.
Detailed Description
The embodiments of the present invention will be further described with reference to the accompanying drawings.
Example 1:
as shown in fig. 1-2, the present invention provides a technical solution: an aeration cooling method for high-ground-temperature tunnel construction comprises the following steps:
s1: original tunnel ventilation design: on the support of a take the altitude apart from being not more than 30m department in the inclined shaft entrance to a cave, set up 2 132kw 2 ventilation fans, utilize the diameter to be 1.5m ventilation pipe, toward the positive hole working face fresh air supply, well ventilation pipe establishes at the top intermediate position at the supplementary gallery section, establishes in the positive hole section cable and illumination line heteropleural side, and the distance of ventilation air outlet apart from the excavation working face is not more than 15m.
S2: and (3) strengthening ventilation and cooling in a high ground temperature section: on the basis of the original tunnel ventilation design, a two-stage scheme is adopted for ventilation and cooling, and the axial flow fan is increased by a large mileage and a small mileage to accelerate the ventilation of the tunnel face.
A1: the first stage ventilation scheme adopts press-in ventilation, and the main scheme is as follows: 2 132KW + 2 ventilators are arranged at the hole opening of the inclined shaft, and fresh air is supplied to the intersection of the inclined shaft by using the ventilation pipe with the diameter of 1.5m, so that the wind resistance of the long inclined shaft section can be reduced.
A2: the ventilation scheme of the second stage adopts relay press-in type ventilation, and the main scheme is as follows: installing 2 132KW 2 ventilators at the intersection of the inclined shaft, connecting an air pipe input from the entrance to the tunnel, supplying fresh air to the tunnel face by using the ventilation pipe with the diameter of 1.5m, correspondingly increasing the number of the ventilators and the jet flow fans along with the propulsion of the excavation, reducing the wind resistance, and accelerating the air circulation speed in the tunnel hole, thereby achieving the effects of improving the working environment and reducing the temperature of the working face, strengthening the forced ventilation fan at the entrance of the tunnel with the power of 2 x 110kW, the air quantity of 1550-912 m3/min, the wind pressure of 860-5355 Pa, the diameter of the air pipe connected with the forced ventilation fan is 1.5m, and the air pipe is connected to the vicinity of the tunnel face, when the ventilation in the tunnel is over 2 kilometers, a second ventilator is arranged at the position 40-60 meters away from the end of the air pipe of the fan at the tunnel opening to supply air into the tunnel, an extraction type ventilator is arranged in the second lining section close to the face end of the tunnel, the power of the ventilator is 2 multiplied by 110KW, the air quantity is 1550-2912 m3/min, the air pressure is 860-5355 Pa, the diameter of the air pipe connected with the ventilator is 1.5m, the air pipe is connected to the outside of the tunnel to suck hot air in the tunnel, 2 ventilators of 5.5kW are respectively added on the excavation trolley, the lower part of the inverted arch, the hanging plate trolley and the second lining trolley, the local air flow speed is enhanced, and the working environment of workers is improved.
S3: local cooling for ice making: self-made ice blocks are stacked to the positions near an excavation rack, an inverted arch, a hanging plate trolley, a secondary lining trolley and a tunnel face on the basic construction site of the original tunnel ventilation design, when the ice blocks absorb heat, the temperature near the tunnel face and a working rack is reduced, 10 ice making machines are arranged, and each single working face of each work area is planned to use 4m ice making machines every day 3 And (4) ice blocks.
S4: sprinkling water for cooling: on the basis of the original tunnel ventilation design, two water sprinkling and cooling measures are adopted for preventing the safety and health of operating personnel from being damaged by terrestrial heat, improving the construction environment in a tunnel and improving the working efficiency.
B1: and (3) sprinkling water on the excavated surface for cooling: a water channel of phi 100 pipe diameter special for sprinkling water for cooling is paved at an intersection to a position near a tunnel face, a water outlet is arranged at each 50m position, a high-pressure spray head with the diameter of 5cm is installed, an access water pipe sprays and cools an excavation face, a dust falling effect is achieved, after tunnel excavation blasting, water is immediately sprayed and cooled on newly excavated and exposed rock residues and rock faces, the temperature of the rock residues is reduced, a large amount of heat dissipation of the rock residues and the rock faces to the air is slowed, and a heat source is reduced.
B2: primary support and lining surface sprinkling and cooling: in high and low temperature areas, cold water is sprayed to the primary support and the lining surface by using a high-pressure spray head of each 50m of a special water spraying pipeline, the spraying surface is guaranteed to be moist, the temperature does not rise any more, the purpose of cooling is achieved, a plurality of spraying devices are additionally arranged in the tunnel along the side wall of the tunnel in a spraying cooling measure, and high-pressure air atomized water is used for forming water mist to reduce the high temperature in the tunnel.
In the embodiment, the construction length of the tunnel inclined shaft is long, so that the air flow speed in the tunnel is accelerated, the construction ventilation scheme in the high ground temperature section is divided into two stages, the first stage adopts a press-in ventilation scheme, the second stage adopts a relay press-in ventilation scheme, the air flow speed in the tunnel is accelerated, the effects of improving the working environment and reducing the temperature of the working surface are achieved, 2 5.5kw ventilators are respectively added on the excavation trolley, the lower part of the inverted arch, the hanging plate trolley and the two lining trolleys, the local air flow speed is enhanced, the working environment of workers is improved, the self-made ice blocks are stacked to the excavation trolley, the inverted arch, the hanging plate trolley, the two lining trolleys and the vicinity of the rock face on site, when the ice blocks absorb heat, the temperature of the rock face and the vicinity of the working trolley is reduced, the safety and the health of operators are prevented from being damaged by the terrestrial heat, the construction environment in the tunnel is improved, the working efficiency is improved, two water sprinkling cooling measures are adopted by the item part, the newly excavated rock slag and the air cooling temperature in the rock face is reduced, the air is effectively reduced, and the air temperature in the excavation trolley is reduced, so that the heat source is not increased, the heat dissipation condition is created, and the heat source is effectively reduced.
As shown in fig. 1-2, on the basis of the first embodiment, the present invention provides a technical solution: and the S2 high-ground-temperature-section reinforced aeration cooling scheme, the S3 ice-making block local cooling scheme and the S4 water spraying cooling scheme can be implemented on the basis of the S1 original tunnel aeration design.
In this embodiment, can select one or more in S2 high ground temperature section enhancement aeration cooling scheme, S3 ice-making piece local cooling scheme and the three kinds of schemes of S4 watering cooling scheme according to the demand, promote the cooling effect.
The working principle and the using process of the invention are as follows: because the construction length of the tunnel inclined shaft is longer, in order to accelerate the air flow speed in the tunnel, the construction ventilation scheme of the high ground temperature section is divided into two stages, the first stage adopts a press-in ventilation scheme, the second stage adopts a relay press-in ventilation scheme, the air flow speed in the tunnel is accelerated, thereby achieving the effects of improving the working environment and reducing the temperature of the working surface, 2 5.5kw ventilators are respectively added on the excavation trolley, the lower part of the inverted arch, the hanging plate trolley and the second lining trolley, the local air flow speed is enhanced, the working environment of workers is improved, the self-made ice blocks are stacked to the positions near the ice block excavation rack, the inverted arch, the hanging plate trolley, the second lining trolley and the tunnel face, when the ice blocks absorb heat, the temperature near the tunnel face and the workbench frame is reduced, the safety and the health of operators are prevented from being harmed by terrestrial heat, the construction environment in a tunnel is improved, the working efficiency is improved, two sprinkling cooling measures are taken by the project, newly excavated exposed rock slag and rock face are sprinkled with water for cooling, the temperature of the rock slag is reduced, a large amount of heat dissipation of the rock slag and the rock face to the air is slowed down, heat sources are reduced, the air temperature in the tunnel is effectively reduced, conditions are created for optimizing the working environment, the sprinkling face is guaranteed to be moist, the temperature does not rise any more, the cooling purpose is achieved, one or more of an S2 high-ground-temperature section strengthening ventilation cooling scheme, an S3 ice block local cooling scheme and an S4 sprinkling cooling scheme can be selected according to requirements, and the cooling effect is improved.
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (7)
1. A ventilation cooling method for high-ground-temperature tunnel construction is characterized by comprising the following steps: the method comprises the following steps:
s1: original tunnel ventilation design: 2 132KW x 2 ventilators are arranged on a support which is not more than 30m away from the hole of the inclined shaft and at a certain height, and fresh air is supplied to the working surface of the main tunnel by using a ventilation pipe with the diameter of 1.5 m;
s2: and (3) strengthening ventilation and cooling in a high ground temperature section: on the basis of the original tunnel ventilation design, a two-stage scheme is adopted for ventilation and cooling, and the axial flow fan is increased for the large mileage and the small mileage to accelerate the air circulation of the tunnel face;
a1: the first stage ventilation scheme adopts press-in ventilation, and the main scheme is as follows: 2 132KW + 2 ventilators are arranged at the hole of the inclined shaft, and fresh air is supplied to the intersection of the inclined shaft by using the ventilation pipe with the diameter of 1.5m, so that the wind resistance of the long inclined shaft section is reduced;
a2: the second stage ventilation scheme adopts relay press-in type ventilation, and the main scheme is as follows: 2 132KW + 2 ventilators are installed at the intersection of the inclined shaft, an air pipe input from the entrance of the cave is connected, fresh air is supplied to the tunnel face by utilizing the ventilation pipe with the diameter of 1.5m, the number of the ventilators and jet flow fans is correspondingly increased along with the propulsion of excavation, the wind resistance is reduced, the air circulation speed in the tunnel is increased, and therefore the effects of improving the operation environment and reducing the temperature of the operation face are achieved;
s3: local cooling for ice making: self-made ice blocks are stacked to the positions near an excavation rack, an inverted arch, a hanging plate trolley, a secondary lining trolley and a tunnel face on the foundation construction site of the original tunnel ventilation design, so that the temperatures near the tunnel face and a working rack are reduced when the ice blocks absorb heat;
s4: sprinkling water for cooling: on the basis of the original tunnel ventilation design, two water sprinkling and cooling measures are adopted for preventing the safety and health of operating personnel from being damaged by terrestrial heat, improving the construction environment in a tunnel and improving the working efficiency;
b1: and (3) sprinkling water on the excavated surface for cooling: a special water-sprinkling water-cooling water channel with the diameter of phi 100 is laid at an intersection to the position near the tunnel face, water outlets are arranged at every 50m, high-pressure spray heads with the diameter of 5cm are installed, water pipes are connected to spray and cool the excavated face, the dust falling effect is achieved, after tunnel excavation and blasting, water is immediately sprayed on newly excavated rock slag and rock faces to cool the newly excavated rock slag and rock faces, the temperature of the rock slag is reduced, a large amount of heat dissipation of the rock slag and the rock faces to the air is slowed down, and heat sources are reduced;
b2: primary support and lining surface sprinkling water for cooling: in high and low temperature areas, cold water is sprayed to the primary support and the lining surface by using a high-pressure spray head of each 50m of a special water spraying pipeline, the spraying surface is guaranteed to be moist, the temperature does not rise any more, the purpose of cooling is achieved, a plurality of spraying devices are additionally arranged in the tunnel along the side wall of the tunnel in a spraying cooling measure, and high-pressure air atomized water is used for forming water mist to reduce the high temperature in the tunnel.
2. The aeration-cooling method for high-ground-temperature tunnel construction according to claim 1, wherein: and the S2 high-ground-temperature-section reinforced aeration cooling scheme, the S3 ice-making block local cooling scheme and the S4 water spraying cooling scheme can be implemented on the basis of the S1 original tunnel aeration design.
3. The aeration-cooling method for high-ground-temperature tunnel construction according to claim 1, characterized in that: s1, in the original tunnel ventilation design, the ventilation pipe is arranged in the middle of the top of the auxiliary tunnel section, the front tunnel section is arranged on the opposite side of the cable and the illumination line, and the distance between the ventilation outlet and the excavation working face is not more than 15m.
4. The aeration-cooling method for high-ground-temperature tunnel construction according to claim 1, wherein: the power of a forced ventilator at the vent hole in the reinforced tunnel in the S2 high ground temperature section reinforced ventilation and temperature reduction is 2 multiplied by 110kW, the air volume is 1550 to 912m < 3 >/min, the air pressure is 860 to 5355Pa, the diameter of an air pipe connected with the forced ventilator is 1.5m, and the air pipe is connected to the position near the tunnel face.
5. The aeration-cooling method for high-ground-temperature tunnel construction according to claim 1, wherein: when the ventilation in the tunnel of the tunnel mouth fan exceeds 2 kilometers in the S2 high ground temperature section enhanced ventilation and cooling process, a second ventilator is arranged at a position 40-60 meters away from the end of the air pipe of the tunnel mouth fan to supply air into the tunnel, a suction type ventilator is arranged in the two lining sections and close to the end of the tunnel face, the power of the ventilator is 2 multiplied by 110KW, the air quantity is 1550-2912 m3/min, the air pressure is 860-5355 Pa, the diameter of the air pipe connected with the ventilator is 1.5m, the air pipe is connected to the outside of the tunnel, and hot air in the tunnel is sucked out of the tunnel.
6. The aeration-cooling method for high-ground-temperature tunnel construction according to claim 1, wherein: s2 set up local ventilation in the high ground temperature section is strengthened ventilating and cooling, respectively increase 2 5.5kw ventilators on excavation platform truck, invert lower part, link plate platform truck and two lining platform trucks, strengthen local air current speed, improve workman' S operational environment.
7. The aeration-cooling method for high-ground-temperature tunnel construction according to claim 1, wherein: s3, 10 ice making machines are arranged in the local cooling process of the ice making blocks, and each work area single working face is planned to use 4m of ice making machines every day 3 Ice cubes.
Priority Applications (1)
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| CN116927853A (en) * | 2023-07-19 | 2023-10-24 | 安徽理工大学 | High-ground-temperature tunnel cooling system and method |
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