A tunnel ventilation device and method for preventing condensation water production

Abstract

The application relates to the technical field of tunnel ventilation, in particular to a tunnel ventilation device and method capable of preventing condensate water from being generated, which comprises a tunnel, a first gas conveying device installed on the ground of the tunnel, a buried main ventilation pipe buried underground of the tunnel, one end of the buried main ventilation pipe being communicated with the first gas conveying device and the other end being closed, a second gas conveying device installed on the top end of the tunnel, and a ceiling ventilation pipe fixed on the top end of the tunnel and arranged along the construction direction of the tunnel, one end of the ceiling ventilation pipe being communicated with the second gas conveying device and the other end being closed. The problem that a large amount of condensate water is generated in the tunnel in severe cold weather and is frozen under the action of cold air is solved, and the device is suitable for the tunnel portal in severe cold weather.

Description

Technical Field

[0001] This invention relates to the field of tunnel ventilation technology, specifically a tunnel ventilation device and method for preventing condensation. Background Technology

[0002] With the development of highway transportation, tunnels are an indispensable and important component of mountain highways. In tunnels operating in frigid weather, the temperature inside the tunnel is higher than the temperature outside. When cold air from outside enters the tunnel through the tunnel entrance, it condenses with the warmer surrounding rock environment inside the tunnel, resulting in a large amount of condensate inside the tunnel. This condensate then freezes under the influence of the cold air, which not only damages the composite lining inside the tunnel but also poses a risk of freezing and cracking pipelines and equipment. More importantly, the ice surface formed on the tunnel road surface poses a serious safety hazard to passing vehicles.

[0003] Therefore, it is necessary to invent a tunnel ventilation device and method to prevent condensation, alleviate seasonal freezing damage in tunnels, improve the service life of pipeline equipment in tunnels, and reduce safety hazards for passing vehicles. Summary of the Invention

[0004] To address the problem of excessive condensation in tunnels during frigid weather, which then freezes under the influence of cold air, this invention provides a tunnel ventilation device and method to prevent condensation.

[0005] This invention is achieved using the following technical solution:

[0006] A tunnel ventilation device for preventing condensation includes a tunnel, a first gas delivery device installed on the ground of the tunnel, a buried main ventilation pipe buried underground along the tunnel construction direction, one end of the buried main ventilation pipe being connected to the first gas delivery device and the other end being closed; a second gas delivery device installed at the top of the tunnel, and a ceiling ventilation pipe fixed at the top of the tunnel along the tunnel construction direction, one end of the ceiling ventilation pipe being connected to the second gas delivery device and the other end being closed.

[0007] Along the tunnel entrance to the tunnel interior, the underground main ventilation pipe is sequentially provided with underground vertical ventilation openings, underground bidirectional ventilation openings, and underground vertical ventilation opening I, all connected to the tunnel. Along the tunnel entrance to the tunnel interior, the ceiling ventilation pipe is sequentially provided with ceiling bidirectional ventilation openings above the underground vertical ventilation openings, ceiling vertical ventilation openings above the underground bidirectional ventilation openings, and ceiling unidirectional ventilation openings above underground vertical ventilation opening I. One end of the underground bidirectional ventilation opening faces the underground vertical ventilation opening, and the other end faces underground vertical ventilation opening I. One end of the ceiling bidirectional ventilation opening faces the tunnel entrance, and the other end faces the ceiling vertical ventilation opening. The ceiling unidirectional ventilation opening faces the ceiling vertical ventilation opening.

[0008] Furthermore, the buried main ventilation pipe is located on the side of the underground tunnel, and ventilation branch pipes are installed between the buried main ventilation pipe and the buried vertical ventilation opening, between the buried main ventilation pipe and the buried bidirectional ventilation opening, and between the buried main ventilation pipe and the buried vertical ventilation opening I.

[0009] Furthermore, the underground bidirectional ventilation opening includes a left underground ventilation opening and a right underground ventilation opening. A left underground guide plate with a left-high and right-low orientation is installed in the left underground ventilation opening, and a right underground guide plate with a left-low and right-high orientation is installed in the right underground ventilation opening. The ceiling bidirectional ventilation opening includes a left ceiling ventilation opening and a right ceiling ventilation opening. A left ceiling guide plate with a left-low and right-high orientation is installed in the left ceiling ventilation opening, and a right ceiling guide plate with a left-high and right-low orientation is installed in the right ceiling ventilation opening. The ceiling unidirectional ventilation opening is equipped with a left ceiling guide plate I with a left-low and right-high orientation.

[0010] Furthermore, the buried vertical ventilation opening, the left buried ventilation opening, the right buried ventilation opening, the buried vertical ventilation opening I, the left ceiling ventilation opening, the right ceiling ventilation opening, the ceiling vertical ventilation opening, and the ceiling one-way ventilation opening are all equipped with air volume regulating valves.

[0011] Furthermore, a first humidity sensor is installed on the ground of the tunnel between the tunnel entrance and the buried vertical ventilation opening; a second humidity sensor is installed on the ground of the tunnel between the buried vertical ventilation opening and the buried bidirectional ventilation opening; and a third humidity sensor is installed on the ground of the tunnel between the buried bidirectional ventilation opening and the buried vertical ventilation opening I.

[0012] Furthermore, it also includes a controller, wherein the first humidity sensor, the second humidity sensor, and the third humidity sensor are all electrically connected to the controller, the first gas delivery device and the second gas delivery device are all electrically connected to the controller, and each airflow regulating valve is electrically connected to the controller.

[0013] Furthermore, both the first gas conveying device and the second gas conveying device are blowers; the top of the buried vertical ventilation opening, the buried bidirectional ventilation opening and the buried vertical ventilation opening I are all covered with protective grates.

[0014] This invention features a reasonable and reliable structural design. Through circulating ventilation, it heats the cold airflow at the tunnel entrance, preventing condensation and thus avoiding icing on the tunnel floor, reducing safety hazards for passing vehicles. Simultaneously, it can exchange the air inside the tunnel with the air at the tunnel entrance, purifying the air within the tunnel. Furthermore, to address temperature and humidity changes at the tunnel entrance, three preheating circulating airflow sections with different operating frequencies are designed, reducing equipment consumption and extending the service life of pipeline equipment within the tunnel. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention.

[0016] Figure 2 This is a top view schematic diagram of the ventilation branch pipe in this invention.

[0017] Figure 3 This is a side view schematic diagram of the present invention.

[0018] In the diagram: 1-Tunnel, 2-First gas delivery equipment, 3-Buried main ventilation pipe, 4-Second gas delivery equipment, 5-Ceiling ventilation pipe, 6-Buried vertical ventilation opening, 7-Buried bidirectional ventilation opening, 8-Buried vertical ventilation opening I, 9-Ceiling bidirectional ventilation opening, 10-Ceiling vertical ventilation opening, 11-Ceiling unidirectional ventilation opening, 12-Ventilation branch pipe, 13-Buried left guide plate, 14-Buried right guide plate, 15-Ceiling left guide plate, 16-Ceiling right guide plate, 17-Ceiling left guide plate I, 18-First humidity sensor, 19-Second humidity sensor, 20-Third humidity sensor. Detailed Implementation

[0019] A tunnel ventilation device to prevent condensation, as shown in the attached... Figure 1 ~Appendix Figure 3 As shown, the tunnel includes a tunnel 1, a first gas delivery device 2 installed on the ground of the tunnel 1, a buried main ventilation pipe 3 buried underground along the construction direction of the tunnel 1, one end of the buried main ventilation pipe 3 being connected to the first gas delivery device 2 and the other end being closed; a second gas delivery device 4 installed at the top of the tunnel 1, and a ceiling ventilation pipe 5 fixed at the top of the tunnel 1 along the construction direction of the tunnel 1, one end of the ceiling ventilation pipe 5 being connected to the second gas delivery device 4 and the other end being closed;

[0020] Along the tunnel entrance 1 to the interior of the tunnel 1, the underground main ventilation pipe 3 is provided with a series of underground vertical ventilation openings 6, 7, and I8 connected to the tunnel 1. Along the tunnel entrance 1 to the interior of the tunnel 1, the ceiling ventilation pipe 5 is provided with a series of ceiling vertical ventilation openings 9, 10, and 11 located above the underground vertical ventilation opening 6 and above the underground vertical ventilation opening 7. One end of the underground vertical ventilation opening 7 faces the underground vertical ventilation opening 6, and the other end faces the underground vertical ventilation opening I8. One end of the ceiling vertical ventilation opening 9 faces the tunnel entrance 1, and the other end faces the ceiling vertical ventilation opening 10. The ceiling vertical ventilation opening 11 faces the ceiling vertical ventilation opening 10.

[0021] In this invention, the air blown out by the first gas conveying device 2 and the second gas conveying device 4 both originate from the constant temperature and humidity air inside the tunnel 1. This not only heats the cold airflow at the tunnel 1 entrance in stages, but also prevents condensation by relying on the heat of the environment inside the tunnel 1 to conduct heat to the cold airflow at the tunnel 1 entrance, thus avoiding the occurrence of ice formation on the ground of the tunnel 1 and reducing the safety hazards of passing vehicles. Furthermore, it can also replace the air inside the tunnel 1 with the air at the tunnel 1 entrance, thereby purifying the air inside the tunnel 1.

[0022] As attached Figure 2 As shown, the buried main ventilation pipe 3 is located on the side of the underground tunnel 1. Ventilation branch pipes 12 are installed between the buried main ventilation pipe 3 and the buried vertical ventilation opening 6, between the buried main ventilation pipe 3 and the buried bidirectional ventilation opening 7, and between the buried main ventilation pipe 3 and the buried vertical ventilation opening 18.

[0023] The underground vertical ventilation opening 6, underground bidirectional ventilation opening 7, and underground vertical ventilation opening I8 are all located in the middle of the ground surface of tunnel 1. This arrangement, together with the ceiling bidirectional ventilation opening 9, ceiling vertical ventilation opening 10, and ceiling unidirectional ventilation opening 11, forms the optimal circulating airflow route, achieving the best effect of preventing condensation and ventilation. The ventilation branch pipe 12 is used to direct the airflow in the underground main ventilation pipe 3 to the underground vertical ventilation opening 6, underground bidirectional ventilation opening 7, and underground vertical ventilation opening I8, facilitating airflow circulation.

[0024] As attached Figure 1 As shown, the underground bidirectional ventilation opening 7 includes a left underground ventilation opening and a right underground ventilation opening. A left underground guide plate 13 with a left-high and right-low orientation is installed in the left underground ventilation opening, and a right underground guide plate 14 with a left-low and right-high orientation is installed in the right underground ventilation opening. The ceiling bidirectional ventilation opening 9 includes a left ceiling ventilation opening and a right ceiling ventilation opening. A left ceiling guide plate 15 with a left-low and right-high orientation is installed in the left ceiling ventilation opening, and a right ceiling guide plate 16 with a left-high and right-low orientation is installed in the right ceiling ventilation opening. A left ceiling guide plate 117 with a left-low and right-high orientation is installed in the ceiling unidirectional ventilation opening 11.

[0025] The buried left guide plate 13 can guide the airflow towards the buried vertical ventilation port 6, which is convenient for participating in the second stage of preheating circulation airflow during operation; the buried right guide plate 14 can guide the airflow towards the buried vertical ventilation port I8, which is convenient for participating in the third stage of preheating circulation airflow during operation.

[0026] The left guide plate 15 of the ceiling can guide the airflow towards the tunnel entrance 1, facilitating its participation in the first stage of preheating circulation during operation; the right guide plate 16 of the ceiling can guide the airflow towards the vertical ventilation opening 10 of the ceiling, facilitating its participation in the second stage of preheating circulation during operation; the left guide plate 117 of the ceiling can guide the airflow towards the vertical ventilation opening 10 of the ceiling, facilitating its participation in the third stage of preheating circulation during operation; thus providing a structural basis for heating the cold airflow at the tunnel entrance 1 in stages.

[0027] The underground vertical ventilation opening 6, the left underground ventilation opening, the right underground ventilation opening, the underground vertical ventilation opening I8, the left ceiling ventilation opening, the right ceiling ventilation opening, the ceiling vertical ventilation opening 10, and the ceiling one-way ventilation opening 11 are all equipped with air volume regulating valves.

[0028] As attached Figure 1 As shown, a first humidity sensor 18 is installed on the ground of the tunnel 1 between the tunnel entrance and the underground vertical ventilation opening 6. A second humidity sensor 19 is installed on the ground of the tunnel 1 between the underground vertical ventilation opening 6 and the underground bidirectional ventilation opening 7. A third humidity sensor 20 is installed on the ground of the tunnel 1 between the underground bidirectional ventilation opening 7 and the underground vertical ventilation opening 18.

[0029] Since the ground of tunnel 1 is in direct contact with passing vehicles, the relative humidity data of the air near the ground of tunnel 1 is crucial for the driving safety of passing vehicles. The first humidity sensor 18, the second humidity sensor 19 and the third humidity sensor 20 are used to detect the relative humidity of the air near the ground of tunnel 1.

[0030] It also includes a controller, the first humidity sensor 18, the second humidity sensor 19 and the third humidity sensor 20 are all electrically connected to the controller, the first gas delivery device 2 and the second gas delivery device 4 are all electrically connected to the controller; and each air volume regulating valve is electrically connected to the controller.

[0031] Both the first gas conveying device 2 and the second gas conveying device 4 are blowers; the tops of the buried vertical ventilation opening 6, the buried bidirectional ventilation opening 7 and the buried vertical ventilation opening I8 are all covered with protective grates.

[0032] A tunnel ventilation method for preventing condensation, the method being based on a tunnel ventilation device for preventing condensation, comprising the following steps:

[0033] Step S1: Turn on the first humidity sensor 18, the second humidity sensor 19, and the third humidity sensor 20, and transmit the real-time humidity detection value to the controller;

[0034] Step S2: When the first humidity sensor 18 detects that the relative humidity of the air near the ground of tunnel 1 reaches 90%, the controller controls the first gas delivery device 2 and the second gas delivery device 4 to start, and simultaneously controls the airflow regulating valves at the buried vertical ventilation opening 6 and the left ceiling ventilation opening to open and adjust to low frequency operation. At this time, the airflow at the buried vertical ventilation opening 6 and the airflow at the left ceiling ventilation opening form the first stage of preheated circulating airflow with the cold airflow at the entrance of tunnel 1, which conducts temperature for the cold airflow at the entrance of tunnel 1, prevents condensation, and provides ventilation at the same time; Appendix Figure 1 In this context, 'a' represents the first stage of preheating circulation airflow.

[0035] Step S3: When the second humidity sensor 19 detects that the relative humidity of the air near the ground of tunnel 1 reaches 90%, the controller controls the airflow regulating valves at the left underground ventilation opening, the right ceiling ventilation opening, and the ceiling vertical ventilation opening 10 to open and adjust to medium frequency operation. At this time, the airflow at the underground vertical ventilation opening 6, the right ceiling ventilation opening, the ceiling vertical ventilation opening 10, and the left underground ventilation opening form the second stage of preheated circulating airflow, which works simultaneously with the first stage of preheated circulating airflow to conduct temperature for the airflow in tunnel 1, prevent condensation, and provide ventilation. Figure 1 In this context, 'b' represents the second stage of preheating circulation airflow.

[0036] Step S4: When the third humidity sensor 20 detects that the relative humidity of the air near the ground of tunnel 1 reaches 90%, the controller controls the airflow regulating valves at the right-side buried ventilation opening, the ceiling one-way ventilation opening 11, and the buried vertical ventilation opening I8 to open and adjust to high-frequency operation. At this time, the airflow at the right-side buried ventilation opening, the airflow at the buried vertical ventilation opening I8, the airflow at the ceiling one-way ventilation opening 11, and the airflow at the ceiling vertical ventilation opening 10 form the third stage of preheated circulating airflow, which works simultaneously with the first and second stages of preheated circulating airflow to conduct temperature for the airflow in tunnel 1, prevent condensation, and provide ventilation. Figure 1 In this context, 'c' represents the third stage of preheating circulation airflow.

[0037] In response to the constantly changing air humidity at the entrance of Tunnel 1, this method sets up a three-stage airflow circulation and allows the first gas delivery device 2 and the second gas delivery device 4 to operate at different frequencies in each stage, thereby reducing equipment consumption and improving the service life of pipeline equipment inside the tunnel.

[0038] Step S5: When the third humidity sensor 20 detects that the relative humidity of the air near the ground of tunnel 1 has dropped to 60%, the controller controls the air volume regulating valve at the right underground ventilation opening, the air volume regulating valve at the ceiling one-way ventilation opening 11, and the air volume regulating valve at the underground vertical ventilation opening I8 to close, and the third stage of preheating circulation airflow stops circulating; at this time, if the second humidity sensor 18 detects that the relative humidity of the air near the ground of tunnel 1 is 90% or above, the controller controls the first gas conveying device 2 and the second gas conveying device 4 to operate at medium frequency, and the first stage of preheating circulation airflow and the second stage of preheating circulation airflow continue to circulate;

[0039] Step S6: When the second humidity sensor 19 detects that the relative humidity of the air near the ground of tunnel 1 has dropped to 60%, the controller controls the air volume regulating valve at the left underground ventilation opening, the air volume regulating valve at the right ceiling ventilation opening, and the air volume regulating valve at the ceiling vertical ventilation opening 10 to close, and the second stage of preheating circulation airflow stops circulating; at this time, if the first humidity sensor 18 detects that the relative humidity of the air near the ground of tunnel 1 is 90% or above, the controller controls the first gas conveying device 2 and the second gas conveying device 4 to operate at low frequency, and the first stage of preheating circulation airflow continues to circulate;

[0040] Step S7: When the first humidity sensor 18 detects that the relative humidity of the air near the ground of tunnel 1 drops to 60%, the controller controls the air volume regulating valve at the underground vertical ventilation opening 6 and the air volume regulating valve at the left ceiling ventilation opening to close, and controls the first gas delivery device 2 and the second gas delivery device 4 to close, and the first preheating circulating airflow stops circulating.

[0041] Based on the above process description, including but not limited to Embodiment A including steps S1, S2, and S7, and Embodiment B including steps S1, S2, S3, S6, and S7, all are within the protection scope of this invention. In specific implementation, the circulation intervals of the first, second, and third stages of preheating circulating airflow can be determined according to the geographical environment of the area where tunnel 1 is located and the orientation of tunnel 1.

[0042] In the description of this invention, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tunnel ventilation device for preventing condensation, comprising a tunnel (1), characterized in that: A first gas delivery device (2) is installed on the ground of the tunnel (1), and a buried main ventilation pipe (3) is buried underground along the construction direction of the tunnel (1). One end of the buried main ventilation pipe (3) is connected to the first gas delivery device (2) and the other end is closed. A second gas delivery device (4) is installed at the top of the tunnel (1), and a ceiling ventilation pipe (5) is fixed at the top of the tunnel (1) along the construction direction of the tunnel (1). One end of the ceiling ventilation pipe (5) is connected to the second gas delivery device (4) and the other end is closed. The underground main ventilation pipe (3) is provided with underground vertical ventilation opening (6), underground bidirectional ventilation opening (7), and underground vertical ventilation opening I (8) connected to the tunnel (1) in sequence from the tunnel (1) entrance to the tunnel (1) interior. The ceiling ventilation pipe (5) is provided with ceiling bidirectional ventilation opening (9) above the underground vertical ventilation opening (6), ceiling vertical ventilation opening (10) above the underground bidirectional ventilation opening (7), and ceiling unidirectional ventilation opening (11) above the underground vertical ventilation opening I (8) in sequence from the tunnel (1) entrance to the tunnel (1) interior. One end of the underground bidirectional ventilation opening (7) faces the underground vertical ventilation opening (6), and the other end faces the underground vertical ventilation opening I (8). One end of the ceiling bidirectional ventilation opening (9) faces the tunnel (1) entrance, and the other end faces the ceiling vertical ventilation opening (10). The opening of the ceiling unidirectional ventilation opening (11) faces the ceiling vertical ventilation opening (10). The underground bidirectional ventilation opening (7) includes a left underground ventilation opening and a right underground ventilation opening. The left underground ventilation opening is equipped with a left-high and right-low underground guide plate (13), and the right underground ventilation opening is equipped with a right-low and right-high underground guide plate (14). The ceiling bidirectional ventilation opening (9) includes a left ceiling ventilation opening and a right ceiling ventilation opening. The left ceiling ventilation opening is equipped with a left-low and right-high ceiling guide plate (15), and the right ceiling ventilation opening is equipped with a right-high and left-low ceiling guide plate (16). The ceiling unidirectional ventilation opening (11) is equipped with a left-low and right-high ceiling guide plate I (17). A first humidity sensor (18) is installed on the ground of the tunnel (1) between the tunnel (1) entrance and the underground vertical ventilation opening (6). A second humidity sensor (19) is installed on the ground of the tunnel (1) between the underground vertical ventilation opening (6) and the underground bidirectional ventilation opening (7). A third humidity sensor (20) is installed on the ground of the tunnel (1) between the underground bidirectional ventilation opening (7) and the underground vertical ventilation opening I (8).

2. The tunnel ventilation device for preventing condensation as described in claim 1, characterized in that: The underground main ventilation pipe (3) is located on the side of the tunnel (1) underground. Ventilation branch pipes (12) are provided between the underground main ventilation pipe (3) and the underground vertical ventilation opening (6), between the underground main ventilation pipe (3) and the underground bidirectional ventilation opening (7), and between the underground main ventilation pipe (3) and the underground vertical ventilation opening I (8).

3. A tunnel ventilation device for preventing condensation as described in claim 1, characterized in that: The underground vertical ventilation opening (6), the left underground ventilation opening, the right underground ventilation opening, the underground vertical ventilation opening I (8), the left ceiling ventilation opening, the right ceiling ventilation opening, the ceiling vertical ventilation opening (10), and the ceiling one-way ventilation opening (11) are all equipped with air volume regulating valves.

4. A tunnel ventilation device for preventing condensation as described in claim 1, characterized in that: It also includes a controller, the first humidity sensor (18), the second humidity sensor (19) and the third humidity sensor (20) are all electrically connected to the controller, the first gas delivery device (2) and the second gas delivery device (4) are all electrically connected to the controller; and each air volume regulating valve is electrically connected to the controller.

5. A tunnel ventilation device for preventing condensation as described in claim 1, characterized in that: The first gas conveying device (2) and the second gas conveying device (4) are both blowers; the top of the buried vertical ventilation opening (6), the buried bidirectional ventilation opening (7) and the buried vertical ventilation opening I (8) are all covered with protective grates.

6. A tunnel ventilation method for preventing condensation, the method being implemented based on a tunnel ventilation device for preventing condensation as described in claim 1, comprising the following steps: Step S1: Turn on the first humidity sensor (18), the second humidity sensor (19), and the third humidity sensor (20), and transmit the real-time humidity detection value to the controller; Step S2: When the first humidity sensor (18) detects that the relative humidity of the air near the ground of the tunnel (1) reaches 90%, the controller controls the first gas delivery device (2) and the second gas delivery device (4) to open. At the same time, it controls the air volume regulating valve at the buried vertical ventilation opening (6) and the air volume regulating valve at the left ceiling ventilation opening to open. It also controls the first gas delivery device (2) and the second gas delivery device (4) to operate at low frequency. At this time, the airflow at the buried vertical ventilation opening (6) and the airflow at the left ceiling ventilation opening form the first preheating circulation airflow with the cold airflow at the tunnel (1) entrance. This airflow conducts temperature and humidity for the cold airflow at the tunnel (1) entrance, prevents condensation, and provides ventilation. Step S3: When the second humidity sensor (19) detects that the relative humidity of the air near the ground of the tunnel (1) reaches 90%, the controller controls the air volume regulating valve at the left buried ventilation port, the air volume regulating valve at the right ceiling ventilation port, and the air volume regulating valve at the ceiling vertical ventilation port (10) to open, and controls the first gas delivery device (2) and the second gas delivery device (4) to operate at medium frequency. At this time, the airflow at the buried vertical ventilation port (6), the airflow at the right ceiling ventilation port, the airflow at the ceiling vertical ventilation port (10) and the airflow at the left buried ventilation port form the second preheating circulation airflow, and work simultaneously with the first preheating circulation airflow to conduct temperature and humidity for the airflow in the tunnel (1), prevent condensation, and provide ventilation at the same time. Step S4: When the third humidity sensor (20) detects that the relative humidity of the air near the ground of the tunnel (1) reaches 90%, the controller controls the air volume regulating valve at the right buried ventilation port, the air volume regulating valve at the ceiling one-way ventilation port (11) and the air volume regulating valve at the buried vertical ventilation port I (8) to open, and controls the first gas delivery device (2) and the second gas delivery device (4) to operate at high frequency. At this time, the airflow at the right buried ventilation port, the airflow at the buried vertical ventilation port I (8), the airflow at the ceiling one-way ventilation port (11) and the airflow at the ceiling vertical ventilation port (10) form the third preheating circulation airflow, and works simultaneously with the first preheating circulation airflow and the second preheating circulation airflow to conduct temperature and humidity for the airflow in the tunnel (1), prevent condensation, and provide ventilation at the same time. Step S5: When the third humidity sensor (20) detects that the relative humidity of the air near the ground of the tunnel (1) drops to 60%, the controller controls the air volume regulating valve at the right buried ventilation port, the air volume regulating valve at the ceiling one-way ventilation port (11) and the air volume regulating valve at the buried vertical ventilation port I (8) to close, and the third preheating circulation airflow stops circulating; at this time, if the second humidity sensor (18) detects that the relative humidity of the air near the ground of the tunnel (1) is 90% or above, the controller controls the first gas conveying device (2) and the second gas conveying device (4) to operate at medium frequency, and the first preheating circulation airflow and the second preheating circulation airflow continue to circulate; Step S6: When the second humidity sensor (19) detects that the relative humidity of the air near the ground of the tunnel (1) drops to 60%, the controller controls the air volume regulating valve at the left underground ventilation opening, the air volume regulating valve at the right ceiling ventilation opening, and the air volume regulating valve at the ceiling vertical ventilation opening (10) to close, and the second stage of preheating circulation airflow stops circulating; at this time, if the first humidity sensor (18) detects that the relative humidity of the air near the ground of the tunnel (1) is 90% or above, the controller controls the first gas conveying device (2) and the second gas conveying device (4) to operate at low frequency, and the first stage of preheating circulation airflow continues to circulate; Step S7: When the first humidity sensor (18) detects that the relative humidity of the air near the ground of the tunnel (1) drops to 60%, the controller controls the air volume regulating valve at the underground vertical ventilation opening (6) and the air volume regulating valve at the left ceiling ventilation opening to close, and controls the first gas conveying device (2) and the second gas conveying device (4) to close, and the first preheating circulating airflow stops circulating.

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