Tunnel ventilation branch pipe and tunnel humidification and dust fall maintenance system

Abstract

The utility model discloses a tunnel ventilation branch pipe and a tunnel humidification and dust fall maintenance system, which comprise a connecting structure and a whistle telescopic pipeline in a vortex structure, and a plurality of secondary air outlets are arranged on the whistle telescopic pipeline. The connecting structure is used for being connected with the connecting end of the rolling whistle telescopic pipeline and the outer wall of a ventilation pipeline of a tunnel and used for controlling communication between the rolling whistle telescopic pipeline and the ventilation pipeline. The whistle rolling telescopic pipeline is used for stretching to abut against the two lining waist portions and being stable under the action of wind power when the whistle rolling telescopic pipeline is communicated with the ventilation pipeline and is used for rolling back to the scroll structure when no air enters the ventilation pipeline.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel maintenance, in particular to a tunnel ventilation branch pipe. In addition, the utility model also relates to a tunnel humidification and dust reduction maintenance system comprising the tunnel ventilation branch pipe. Background Art

[0002] With the continuous increase in road traffic construction and municipal engineering construction, tunnel construction has also been increasing. Strengthening the safety control of tunnel construction has become more important, and tunnel ventilation technology is an important aspect to ensure the safety of tunnel construction and the health of workers. In tunnel construction, due to the large amount of rock powder, vehicle exhaust, and dust generated by tunnel blasting and slag transportation, the air quality in the tunnel has decreased, which is not conducive to construction safety and worker health. In order to ensure the air quality of tunnel construction, the previous ventilation methods of tunnels, such as duct type, lane type, and wind wall type, are currently the main ventilation and dust reduction methods in tunnel construction. The above methods are effective in reducing the dust concentration generated during drilling, blasting and excavation of the tunnel face, but the effect on the dust suspended in the tunnel during the mucking and vehicle transportation of the tunnel is extremely limited. At the same time, the dust in the surrounding rock removal and danger removal work after the blasting of the face seriously affects the working line of sight of the excavator operator, and the existing technology usually takes about 50 minutes to resume normal face construction, which makes it impossible to carry out compact construction and seriously delays the construction period.

[0003] In recent years, several accidents endangering traffic safety have occurred in operating tunnels at home and abroad due to tunnel lining diseases. These lining diseases have almost caused serious traffic accidents and endangered operational safety. In order to ensure tunnel operation safety, improve the quality of tunnel lining construction, and reduce the incidence of diseases, the early maintenance of tunnel lining concrete is the top priority in the maintenance process, and its maintenance quality directly affects the strength and durability of the later tunnel concrete. At present, in tunnel construction, lining maintenance generally adopts natural maintenance and simple water spraying maintenance. The above maintenance methods are greatly affected by the external environment and human factors, the maintenance effect is not good, and it is difficult to ensure the quality and service life of the lining.

[0004] Therefore, how to solve the problem of accelerating the quality of rapid ventilation in the tunnel and the early maintenance effect of the tunnel secondary lining construction has a direct impact on the construction period, the safety of construction personnel working in confined spaces, the construction quality and service life of the secondary lining during operation.

[0005] The structure of the commonly used tunnel ventilator in the prior art is composed of a ventilator and a ventilation hose. The ventilator is arranged outside the tunnel, and the ventilation hose is connected to the end of the ventilator and extends to the air supply position. However, as the tunnel excavation progress increases, the ventilator is farther away from the face. Under high ground temperature conditions, construction workers generally feel that the wind blown into the tunnel by the ventilator is too hot. The air temperature in the tunnel operation range is high. Working for a long time in such a harsh working environment is very detrimental to the health of the workers, and is also detrimental to the strength of the lining concrete and the development of cracks.

[0006] The thermal evaporative auxiliary ventilation system in the prior art consumes a lot of energy for humidification and has low energy efficiency. The electric heating tube is immersed in water, which generates heat, causing the water to boil and turn into water vapor, thereby increasing the limited air temperature in the tunnel. The generated high-temperature water vapor has a bad effect on the conveying pipeline and the working environment in the tunnel. Similar existing patents such as Patent No.: 202320604295.8 disclose a tunnel ultrasonic water mist dust reduction device, which solves the problem of difficult tunnel ventilation and dust reduction and poor ventilation and dust reduction effects by using ultrasonic humidification. However, the maintenance trolley often needs to be moved synchronously and cannot be avoided in the limited working space in the tunnel. It will cause a certain impact on the normal passage of construction vehicles, reduce construction efficiency, and the disassembly and assembly operations lead to higher construction costs;

[0007] The cold and hot neutralization evaporative auxiliary ventilation system in the prior art adjusts the temperature in the ventilation duct by neutralizing dry cold air with high-temperature water vapor, but lacks closed-loop feedback measures to stably control the temperature of the adjusted air. At the same time, the temperature in the tunnel and the temperature of the ventilation duct also change over time, causing the water vapor entering the ventilation duct to further condense during the transportation process due to the temperature difference between the inside and outside of the ventilation duct, and adhere to the wall of the ventilation duct, further reducing the humidification efficiency. The saturated wet air is directly transported to the face, and then returned to the second lining from the face with the airflow, which has a better dust reduction effect on the face. After a long journey, a large amount of water vapor in the saturated wet air gradually condenses, and the air humidity gradually decreases, resulting in poor maintenance effect. Therefore, this method will cause more energy waste and low humidification efficiency. Utility Model Content

[0008] The utility model provides a tunnel ventilation branch pipe and a tunnel humidification and dust reduction maintenance system to solve the technical problems of the humidification and dust reduction maintenance method in the prior art that the humidification and dust reduction maintenance method has high energy consumption, low utilization rate and large space occupation, which affects the construction.

[0009] According to one aspect of the utility model, a tunnel ventilation branch pipe is provided, comprising a connecting structure and a retractable duct with a scroll structure, wherein a plurality of secondary air outlets are provided on the retractable duct, and the connecting structure is used to be respectively connected to the connecting end of the retractable duct and the outer wall of the ventilation duct of the tunnel, and is used to control the connection between the retractable duct and the ventilation duct; the retractable duct is used to be extended by the wind to press against the waist of the second lining and stabilize when connected with the ventilation duct, and is used to curl up into the scroll structure when there is no incoming wind.

[0010] As a further improvement of the above technical solution, the connection structure includes a conical connecting joint for being arranged on the ventilation duct and a cylindrical member arranged on the connecting end of the whistle telescopic duct, and the outer wall of the connecting joint is provided with a groove for embedding a clamp.

[0011] As a further improvement of the above technical solution, the connection structure is provided with a box plate valve, and the box plate valve is used to connect the reel telescopic pipe and the ventilation pipe when it is opened.

[0012] As a further improvement of the above technical solution, the tunnel ventilation branch pipe also includes embedded parts and connecting parts. The embedded parts are used to be embedded in the top of the secondary lining of the tunnel, and the connecting parts are used to respectively connect the retractable pipe and the embedded parts for support when the retractable pipe is in an extended state.

[0013] According to another aspect of the utility model, a tunnel humidification and dust reduction maintenance system is also provided, which includes a ventilation system, a water supply system, a control system, and a humidification device respectively connected to the ventilation system and the water supply system, the ventilation system includes a fan and a ventilation duct, the water supply system includes a high-pressure water pipe and a water source, and the tunnel humidification and dust reduction maintenance system uses any of the above-mentioned tunnel ventilation branches.

[0014] As a further improvement of the above technical solution, the ventilation duct is a segmented assembly structure and matches the length of the second lining of each plate, and the connection structure is provided on each segment of the ventilation duct.

[0015] As a further improvement of the above technical solution, the control system includes a pressure-limiting and flow-limiting sensing valve arranged between the humidifying device and the high-pressure water pipe, and the pressure-limiting and flow-limiting sensing valve is used to open when the water pressure reaches a preset value.

[0016] As a further improvement of the above technical solution, the control system includes a bidirectional booster pump arranged in the water supply system, and the booster pump has a pressure regulating valve.

[0017] As a further improvement of the above technical solution, the pipe wall of the whistle telescopic pipe and the pipe wall of the ventilation duct are provided with a coating for resistance to high and low temperatures.

[0018] As a further improvement of the above technical solution, the humidifying device is an ultrasonic humidifier.

[0019] The utility model has the following beneficial effects:

[0020] The ventilation branch pipe of this tunnel is connected to the tunnel ventilation duct through a connecting structure. During the drilling construction of the heading face or other situations where humidification and dust reduction maintenance are required, the connecting structure connects the ventilation duct and the retractable duct with a whistle. After the air inlet of the retractable duct is opened, it can be extended based on the component force of the wind force in the ventilation duct, so that the end of its free end abuts against the waist of the second lining to complete the stability. The humidified air humidified by the humidifying device is output through the secondary air outlet of the retractable duct with the whistle, so as to realize the humidification and dust reduction maintenance in the tunnel. When the maintenance is completed or engineering equipment, vehicles, etc. need to pass through, the inlet end of the retractable duct is closed to make it curled up. Retract the scroll state, and set the reel telescopic pipe to directly transport saturated moist air to the surface of the second lining in the aged second lining section, so as to improve the maintenance coverage effect and solve the problem of poor maintenance effect of returning moist air from the heading face. The reel telescopic pipe is designed to be able to curl up to the scroll state in a non-working state, which ensures the passability of equipment and vehicles and avoids damage caused by vehicles passing through when the pipe falls. Compared with the existing maintenance method, it can avoid the use of additional equipment such as trolleys, reduce the space occupied in the tunnel, reduce the maintenance cost, improve the maintenance efficiency, and ensure the working environment and traffic in the limited space of the tunnel.

[0021] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0023] Figure 1 This is a schematic diagram of the structure of the preferred embodiment of the utility model Figure 1 ;

[0024] Figure 2 This is a schematic diagram of the structure of the preferred embodiment of the utility model Figure 2 ;

[0025] Figure 3 This is a schematic diagram of the working state of the retractable whistle pipe of the preferred embodiment of the utility model;

[0026] Figure 4 yes Figure 3 A partial enlarged view of

[0027] Figure 5 This is a schematic diagram of a curled-up state of a whistle retractable pipe in a preferred embodiment of the utility model;

[0028] Figure 6 yes Figure 5 A partial enlarged view of .

[0029] Legend:

[0030] 1. Construction platform 2. Fan 3. Iron frame 4. Ventilation duct 5. Secondary lining 6. Pressure and current limiting induction valve 7. Humidifier 8. High-pressure water pipe 9. Water pipe branch 10. Connector 11. Winding telescopic pipe 12. Box plate valve 100. Work face 200. Forklift 300. Muck truck 400. Water mist. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. However, the present invention can be implemented in a variety of different ways as defined and covered below.

[0032] Figure 1 This is a schematic diagram of the structure of the preferred embodiment of the utility model Figure 1 ; Figure 2 This is a schematic diagram of the structure of the preferred embodiment of the utility model Figure 2 ; Figure 3 This is a schematic diagram of the working state of the retractable whistle pipe of the preferred embodiment of the utility model; Figure 4 yes Figure 3 A partial enlarged view of Figure 5 This is a schematic diagram of a curled-up state of a whistle retractable pipe in a preferred embodiment of the utility model; Figure 6 yes Figure 5 A partial enlarged view of

[0033] like Figures 1 to 6 As shown, the tunnel ventilation branch pipe of this embodiment includes a connecting structure and a retractable duct 11 with a scroll structure. A plurality of secondary air outlets are provided on the retractable duct 11. The connecting structure is used to be connected to the connecting ends of the retractable duct 11 and the outer wall of the ventilation duct 4 of the tunnel respectively, and is used to control the connection between the retractable duct 11 and the ventilation duct 4; the retractable duct 11 is used to be stretched under the action of wind to press against the waist of the second lining and stabilize when connected with the ventilation duct 4, and is used to curl up into the scroll structure when there is no incoming wind.

[0034] The retractable duct 11 contracts into a vortex state without external force, and when an external force such as wind penetrates into the duct, the retractable duct 11 stretches into a straight-line duct; the retractable duct 11 is designed according to the actual wind force provided, so that the retractable duct 11 is stretched after the wind force reaches a certain value; the secondary air outlet on the surface of the retractable duct 11 is in a "plum blossom shape", and in other embodiments, it can also be other shapes that are convenient for air output;

[0035] It should be noted that a humidifying device 7 is provided in the tunnel system to which the tunnel ventilation branch pipe is applied to humidify the air in the ventilation duct 4;

[0036] It can be understood that the ventilation branch pipe of the tunnel is connected to the tunnel ventilation duct 4 through a connecting structure. When drilling construction is carried out on the face 100 or other situations where humidification and dust reduction maintenance are required, the connecting structure connects the ventilation duct 4 and the retractable duct 11. After the air inlet of the retractable duct 11 is opened, it can be extended based on the component force of the wind force in the ventilation duct 4, so that the end of its free end is abutted against the waist of the second lining to complete the stability. The humidified air humidified by the humidifying device 7 is output through the secondary air outlet of the retractable duct 11, so as to realize the humidification and dust reduction maintenance in the tunnel. When maintenance is completed or engineering equipment and vehicles such as forklifts 200 and muck trucks 300 need to pass through, the retractable duct 11 is closed. The inlet end of the telescopic duct 11 is curled back into a scroll state. By setting the telescopic duct 11, saturated moist air is directly transported to the surface of the second lining in the aged second lining section, thereby improving the maintenance coverage effect and solving the problem of poor maintenance effect of returning moist air from the heading face 100. The design and use of the telescopic duct 11 can be curled back into a scroll state in a non-working state, thereby ensuring the passability of equipment and vehicles and avoiding damage caused by vehicles passing through when the duct falls. Compared with the existing maintenance method, it can avoid the use of additional equipment such as trolleys, reduce the space occupied in the tunnel, reduce the maintenance cost, improve the maintenance efficiency, and ensure the working environment and smooth traffic in the limited space of the tunnel.

[0037] In this embodiment, the connection structure includes a conical connection joint for being arranged on the ventilation duct 4 and a cylindrical member arranged on the connection end of the reel telescopic duct 11, and the outer wall of the connection joint is provided with a groove for embedding a clamp; specifically, a conical connection joint is reserved on the ventilation duct 4 as a connection structure, and the connection structure of the reel telescopic duct 11 can be a hard cylindrical member arranged at its connection end, which can be embedded in the conical joint, and the outer wall of the conical joint is provided with a groove for embedding a clamp to fasten the reel telescopic duct 11; the connection between the ventilation duct 4 and the reel telescopic duct 11 adopts an assembled structure, which is easy to disassemble and operate, and can be disassembled after the maintenance cycle is completed for turnover and continued use; a connection structure is arranged on the ventilation duct 4 every 12m or every two linings of each board, and a connection joint is reserved; hooks are respectively arranged on the connection joint and the top of the tunnel, and the connection joint is hung to the top of the tunnel through the connection member 10 to ensure that the joint is firm when conducting wind;

[0038] In this embodiment, the connection structure is provided with a cartridge valve 12, and the cartridge valve 12 is used to connect the reel telescopic pipe 11 and the ventilation pipe 4 when it is opened. Specifically, by arranging the cartridge valve 12 at the connection joint, when the reel telescopic pipe 11 needs to be ventilated, the cartridge valve 12 is opened to connect the two, and closing the cartridge valve 12 can close the inlet end of the reel telescopic pipe 11, which is easy to operate and improves the construction efficiency and maintenance efficiency; wherein, the cartridge plate of the cartridge valve 12 is driven by a screw rod, and in some embodiments, a hand wheel and / or a driver can be provided at the operating end of the screw rod, so that the cartridge valve 12 can be manually operated to open and / or the driver can be remotely controlled by the control system to open the cartridge valve 12.

[0039] In this embodiment, the tunnel ventilation branch pipe also includes an embedded part and a connecting part 10. The embedded part is used to be embedded in the top of the tunnel secondary lining 5 and matches the installation position of the reel telescopic pipe 11. The connecting part 10 is used to connect the reel telescopic pipe 11 and the embedded part to provide support when the reel telescopic pipe 11 is extended. The connecting part 10 can be a hook. After the reel telescopic pipe 11 is extended, the connecting part 10 is hooked to the embedded part and the reel telescopic pipe 11 is hung to support it. It should be understood that the hook at the connection joint position still maintains connection with the embedded part and supports the connection joint when the reel telescopic pipe 11 is in a curled state or removed.

[0040] On the other hand, the present embodiment also provides a tunnel humidification and dust reduction maintenance system, which includes a ventilation system, a water supply system, a control system, and a humidification device 7 respectively connected to the ventilation system and the water supply system. The ventilation system includes a fan 2 and a ventilation duct 4, and the water supply system includes a high-pressure water pipe 8 and a water source. The tunnel humidification and dust reduction maintenance system uses the above-mentioned tunnel ventilation branch pipe.

[0041] It should be noted that in the existing tunnel construction, a ventilation system and a water supply system are usually set up. The ventilation system is provided by setting a fan 2 on the construction platform 1 outside the tunnel, supported by an iron frame 3, CI identification signs are hung around the iron frame 3, and a ventilation duct 4 is set along the extension direction of the tunnel. The high-speed flowing air is converted into a high-pressure airflow by the fan 2 so as to discharge the air out of the tunnel. The control system includes a controller for adjusting the speed and air volume of the fan 2 to meet different needs inside the tunnel; the high-pressure water pipe 8 of the water supply system is connected to an external water source (such as a water tank, a pool), close to the tunnel. The secondary lining 5 is provided to supply clean water for tunnel construction; the high-pressure water pipe 8 is connected to the ventilation duct 4 through the water pipe branch 9, and the humidifying device 7 is provided on the water pipe branch 9; the ultrasonic humidifier in the prior art is selected as the humidifying device 7, which uses high-frequency oscillation and high-frequency vibration of the atomizing plate to make the water in the humidifier be thrown off the water surface to generate water mist 400, and the water mist 400 generated by the humidifier is mixed with the cold air in the ventilation system through the steam delivery pipe and then output to achieve the purpose of air humidification, which can reduce energy consumption, improve humidification efficiency, and avoid condensation caused by temperature difference;

[0042] In this embodiment, the ventilation duct 4 is a segmented assembly structure, each segment is 12m or matches each plate two linings, and a connection structure is provided on each segment of the ventilation duct 4, that is, a connection joint is reserved for each segment;

[0043] In this embodiment, the control system includes a pressure-limiting and current-limiting sensing valve 6 arranged between the humidifying device 7 and the high-pressure water pipe 8. The pressure-limiting and current-limiting sensing valve 6 is used to open when the water pressure reaches a preset value; the pressure-limiting and current-limiting sensing valve 6 is installed between the water supply system and the humidifying device 7, and the pressure-limiting and current-limiting sensing valve 6 is debugged so that the pressure-limiting and current-limiting sensing valve 6 opens when the water pressure reaches a preset value and closes when the water pressure is lower than the preset value. Among them, the pressure-limiting and flow-limiting sensing valve 6 includes a valve body, a valve core, a spring and an adjusting nut. The pressure-limiting and flow-limiting sensing valve 6 is used to control the pressure of the fluid to remain within a set range. When the fluid enters the pressure-limiting and flow-limiting sensing valve 6 through the valve body, the valve core moves upward under the action of the fluid pressure. When it rises to a certain height, the spring is compressed to close the valve. When the fluid pressure drops, it moves downward under the action of the spring to open the valve, so that the fluid continues to flow. When the water pressure reaches a preset value, the valve is opened and the ultrasonic humidifier is started. The pressure-limiting and flow-limiting sensing valve 6 is used as the switch of the humidifying device 7, so that the opening of the humidifying device 7 matches the drilling operation time of the face 100, and the operation is automatically matched when dust reduction maintenance is required, so that it is more efficient and energy-saving, and the construction cost is reduced.

[0044] In this embodiment, the control system includes a two-way booster pump arranged in the water supply system, and the booster pump has a pressure regulating valve; a two-way booster pump is arranged outside the tunnel to draw water from a water source to supply water to the high-pressure water pipe 8 of the water supply system, and the pressure regulating valve is arranged on the booster pump. When drilling a hole in the face 100, the water pressure reaches 0.8Mpa, so that the valve is opened, and then water is provided to the ultrasonic humidifier to realize automatic humidification and dust reduction maintenance; when the face 100 is not drilled, the booster pump can also be opened by manually adjusting the pressure regulating valve, and when the water pressure reaches 0.6Mpa, the pressure limiting and current limiting sensing valve 6 can be opened for maintenance.

[0045] In this embodiment, the ventilation duct 4 and the retractable duct 11 are both made of flame-retardant air duct cloth. The air duct cloth is made of high-strength polyester glass fiber woven into a coated base cloth, and the PVC is modified as a surface film, which effectively combines the high-strength base cloth with the high-tech surface film; the pipe wall of the retractable duct 11 and the pipe wall of the ventilation duct 4 are provided with a coating for resistance to high and low temperatures, and the coating is a high and low temperature resistant nano coating to prevent the liquefaction of water vapor in the pipe, thereby solving the problem of condensation adhering to the pipe wall, increasing the dead weight of the pipe wall and causing damage, and energy loss causing its functional efficiency to be low. At the same time, it has corrosion resistance and serves as a pipe protective film to prevent the pipe from being affected by water vapor corrosive substances and affecting its service life.

[0046] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A tunnel ventilation branch pipe, characterized in that: The invention comprises a connection structure and a scroll-shaped telescopic duct (11), wherein the telescopic duct (11) is provided with a plurality of secondary air outlets, and the connection structure is used to be respectively connected to the connection end of the telescopic duct (11) and the outer wall of the ventilation duct (4) of the tunnel, and is used to control the communication between the telescopic duct (11) and the ventilation duct (4). The connection structure comprises a conical connection joint for being arranged on the ventilation duct (4) and a cylindrical member arranged on the connection end of the telescopic duct (11). The outer wall of the connection joint is provided with a groove for embedding a clamp, and the connection structure is provided with a box plate valve (12); when the telescopic duct (11) is connected with the ventilation duct (4), the wind force penetrating from the ventilation duct (4) causes the top of the wind duct (11) to be stretched into a straight line to press against the waist of the second lining and stabilize it, and is used to curl back into the scroll structure when there is no air inflow.

2. The tunnel ventilation branch pipe according to claim 1, characterized in that: The tunnel ventilation branch pipe also includes an embedded part and a connecting part (10), wherein the connecting part (10) is a hook, and the embedded part is used to be embedded in the top of the tunnel secondary lining (5), and the connecting part (10) is used to respectively connect the retractable duct (11) and the embedded part when the retractable duct (11) is in an extended state to provide support.

3. A tunnel humidification and dust reduction maintenance system, characterized in that: The tunnel humidification and dust reduction maintenance system comprises a ventilation system, a water supply system, a control system and a humidification device (7) respectively connected to the ventilation system and the water supply system, the ventilation system comprises a fan (2) and a ventilation duct (4), the water supply system comprises a high-pressure water pipe (8) and a water source, and the tunnel humidification and dust reduction maintenance system applies the tunnel ventilation branch pipe described in any one of claims 1-2.

4. The tunnel humidification and dust reduction maintenance system according to claim 3 is characterized in that: The ventilation duct (4) is a segmented assembly structure and matches the length of the second lining of each plate, and the connection structure is arranged on each segment of the ventilation duct (4).

5. The tunnel humidification and dust reduction maintenance system according to claim 3 is characterized in that: The control system comprises a pressure-limiting and flow-limiting sensing valve (6) arranged between the humidifying device (7) and the high-pressure water pipe (8), the pressure-limiting and flow-limiting sensing valve (6) being used to open when the water pressure reaches a preset value, and the pressure-limiting and flow-limiting sensing valve (6) comprising a valve body, a valve core, a spring and an adjusting nut.

6. The tunnel humidification and dust reduction maintenance system according to claim 3 is characterized in that: The control system comprises a bidirectional booster pump arranged in the water supply system, and the booster pump has a pressure regulating valve.

7. The tunnel humidification and dust reduction maintenance system according to claim 3 is characterized in that: The pipe wall of the whistle retractable pipe (11) and the pipe wall of the ventilation pipe (4) are provided with a coating for resisting high and low temperatures.

8. The tunnel humidification and dust reduction maintenance system according to claim 3 is characterized in that: The humidifying device (7) is an ultrasonic humidifier.

Images