Method for working inside tunnel and tunnel air conditioning system

Abstract

To provide a method for working inside tunnels capable of shortening construction periods while reliably maintaining the safety and health of operators.SOLUTION: When performing hazardous work that emits harmful substances and general work that does not emit harmful substances inside a tunnel, a first-side safety work involves simultaneously performing the general work on a first side of a hazardous area where the hazardous work is being conducted, with a first directional airflow from a first pit mouth toward a second pit mouth inside the tunnel, and a second-side safety work involves simultaneously performing the general work on a second side of the hazardous area where the hazardous work is being conducted, with a second directional airflow from the second pit mouth toward the first pit mouth inside the tunnel. The work inside the tunnel proceeds by switching between the first-side safety work and the second-side safety work on a timely basis.SELECTED DRAWING: Figure 12

Description

[Technical Field]

[0001] The present invention relates to a tunnel work method and a tunnel air conditioning system. [Background technology]

[0002] Once a tunnel is completed, work will be required, such as repairs, renovations, rehabilitation, and inspections, as well as firefighting in the event of an accident inside the tunnel and removing obstacles. A typical example is the pipe-in-pipe (PIP) method, which is a method of rehabilitation for water supply (water supply and sewerage) pipes, in which a new pipe is installed inside an existing, deteriorated pipe to rehabilitate the pipeline. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent 6216690 [Patent Document 2] Patent Publication No. 2016-007910 Summary of the Invention [Problem to be solved by the invention]

[0004] We will use the pipe-in-pipe (PIP) method, one of the pipeline rehabilitation methods, as an example. One type of pipe-in-pipe method is the retracted pipe method. This method allows a new pipe to be installed inside the existing pipe with a diameter close to that of the existing pipe, allowing for the rehabilitation of aging pipelines with minimal cross-sectional area reduction, making it a desirable method for pipeline rehabilitation. However, in order to install the new pipe, the pipe must first be cut in the direction of its extension and retracted to a smaller diameter in order to transport it to the installation site. At the installation site, the new pipe must then be expanded to a diameter slightly smaller than that of the existing pipe, and then welded (bonded) in the axial and circumferential directions. This welding (bonding) process, i.e., the fixing process, generates hazardous substances. Such work, which generates hazardous substances (hazardous work), must be performed by qualified, specialized workers who have received specialized training (e.g., special arc welding training, gas welding workshop training, and organic solvent handling supervisors) and wear protective clothing and dust masks. When hazardous work is being performed, personnel performing other general tasks, i.e., tasks that do not generate hazardous substances, are not permitted inside the tunnel. For this reason, the pipe-in-pipe method using retractable pipes is a time-consuming (day-long) construction project. It is difficult to perform multiple tasks simultaneously while ensuring the safety and health of workers in any tunnel work, not just with the pipe-in-pipe method. Therefore, even when working inside an existing tunnel, even if it does not involve digging a new tunnel, working inside the tunnel is still a difficult project that cannot be shortened. However, in recent years, there has been a labor shortage, and the number of pipelines requiring renovation work is enormous.

[0005] Controlling ventilation in a long tunnel is difficult, and even wind direction can change due to differences in temperature, air pressure, and wind speed between the two tunnel entrances. To carry out these construction projects, it is not enough to simply control wind direction; it is also necessary to maintain a minimum wind speed (in this example, for example) of 0.8 m / s or higher, determined by the minimum ventilation volume required for simultaneous work, without exceeding the 1.0 m / s upper limit set by the Industrial Safety and Health Regulations (cold season). Therefore, a control system is required that can maintain a constant wind speed despite the influence of external factors (weather and climate).

[0006] The object of the present invention is to provide a method for working in a tunnel that can dramatically shorten the construction period while reliably maintaining the safety and health of workers, and a tunnel air conditioning system for that purpose. [Means for solving the problem]

[0007] The method for working inside a tunnel according to claim 1 comprises: A method for working inside a tunnel, the method comprising: performing work inside a tunnel having a first entrance which is a first side entrance and a second entrance which is a second side entrance, In carrying out hazardous work that emits hazardous substances and general work that does not emit hazardous substances within the tunnel, a first-side safety work in which the general work is carried out in parallel on a first side of the hazardous area where the hazardous work is being carried out, with the airflow in the tunnel being a first-direction airflow from the first entrance to the second entrance; and second-side safety work, in which the general work is carried out in parallel on the second side of the hazardous area where the hazardous work is being carried out, with the airflow in the tunnel being a second-direction airflow from the second tunnel entrance toward the first tunnel entrance; The work inside the tunnel is carried out by switching between the first side safety work and the second side safety work every hour. It is characterized by:

[0008] The method for working inside a tunnel according to claim 2 comprises: In the tunnel work method according to claim 1, An air conditioning system is installed in the tunnel that switches the airflow in the tunnel between a first direction airflow from the first tunnel entrance to the second tunnel entrance and a second direction airflow from the second tunnel entrance to the first tunnel entrance; The air conditioning system switches the airflow in the tunnel between the first direction airflow and the second direction airflow, The work inside the tunnel is carried out by switching between the first side safety work and the second side safety work every hour. It is characterized by:

[0009] The method for working inside a tunnel according to claim 3 comprises: In the tunnel work method according to claim 1, Work is started in the tunnel from an area at or near the center between the first and second entrances, and then work is carried out in parallel toward both the first and second entrances. It is characterized by:

[0010] The method for working inside a tunnel according to claim 4 comprises: In the tunnel work method according to claim 1, The general work is the work of pulling a new pipe into the tunnel, The harmful work is the work of fixing the new pipe that has been pulled in. It is characterized by:

[0011] The tunnel air conditioning system according to claim 5 is A tunnel air conditioning system that is installed in a tunnel having a first entrance which is a first side entrance and a second entrance which is a second side entrance, and that switches the airflow in the tunnel between a first direction airflow from the first entrance to the second entrance and a second direction airflow from the second entrance to the first entrance, A first ventilation device is installed on the first tunnel entrance side and switches between sending outside air into the tunnel from the first tunnel entrance and exhausting the air inside the tunnel to the outside air from the first tunnel entrance; a second ventilation device that is installed on the second tunnel entrance side and that switches between an air supply that sends outside air into the tunnel from the second tunnel entrance and an exhaust that discharges the air inside the tunnel to the outside air from the second tunnel entrance. It is characterized by:

[0012] The tunnel air conditioning system according to claim 6 is In the tunnel air conditioning system according to claim 5, the first ventilation device and the second ventilation device are communicatively connected via wireless communication, The first ventilation device and the second ventilation device each have, as operation mode selection means, an air supply operation selection input unit that selects air supply operation and an exhaust operation selection input unit that selects exhaust operation, one of the first ventilation device and the second ventilation device that has received an operation mode selection operation from a user is designated as a local device, and the other is designated as a second device; When the device itself has confirmed that its own operating state is off and that the other device is also off, the device sets its own operating mode to one of an air supply operating mode and an exhaust operating mode in accordance with the operating mode selection operation received from the user, and transmits an operating mode setting command to the other device to set it to the other of the air supply operating mode and the exhaust operating mode; The other device sets the other of the air supply operation mode and the exhaust operation mode in accordance with the received operation mode setting command. It is characterized by:

[0013] The tunnel air conditioning system according to claim 7 is In the tunnel air conditioning system according to claim 5, the first ventilation device and the second ventilation device are communicatively connected via wireless communication, The first ventilation device and the second ventilation device each include a ventilation device that generates an airflow using a fan and a motor, and a control unit that controls the operation of the ventilation device, The first ventilation device and the second ventilation device each have an operation-on input unit, one of the first ventilation device and the second ventilation device that has received an operation-on operation from a user is designated as a local device, and the other is designated as a second device; When the device itself has confirmed that its own operating state is off and that the other device is also off, the device turns on the operating state of the device itself and transmits an operation start command to the other device; The other device that has received the operation start command turns on the operation state of the other device and transmits a receipt confirmation to the own device, and the other device starts the other of the air supply operation and the exhaust operation of the ventilation equipment of the other device, After receiving the receipt confirmation from the other device, the device starts one of the air supply operation and the exhaust operation of the ventilation device of the device. It is characterized by:

[0014] The tunnel air conditioning system according to claim 8 is In the tunnel air conditioning system according to claim 7, After checking the change in the measurement value of the anemometer installed in the tunnel, the device starts one of the air supply operation and the exhaust operation of the ventilation equipment of the device. It is characterized by:

[0015] The tunnel air conditioning system according to claim 9, In the tunnel air conditioning system according to claim 5, the first ventilation device and the second ventilation device are communicatively connected via wireless communication, The first ventilation device and the second ventilation device each include a ventilation device that generates an airflow using a fan and a motor, and a control unit that controls the operation of the ventilation device, The first ventilation device and the second ventilation device each have an operation-off input unit, one of the first ventilation device and the second ventilation device that has received an operation-off operation from a user is designated as a local device, and the other is designated as a second device; When the device itself has confirmed that its own operation state is on and that the other device is also in an on state, the device stops the ventilation equipment of the device itself and transmits an operation-off command to the other device; The control unit of the other device that has received the operation-off command stops the ventilation equipment of the other device and transmits a receipt confirmation to the own device, and then turns off the operation state of the other device; After receiving the receipt confirmation from the other device, the device turns off the operation state of the device. It is characterized by:

[0016] The tunnel air conditioning system according to claim 10, In the tunnel air conditioning system according to claim 5, Based on a moving average of the measured values ​​of an anemometer installed inside the tunnel and a preset target value of the wind speed, the first ventilation device and the second ventilation device are feedback-controlled so that the wind speed inside the tunnel falls within a range set by the target value. It is characterized by: [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a diagram for explaining the configuration of a tunnel air-conditioning system according to a first embodiment of the present invention. FIG. [Figure 2] FIG. 4 is a diagram illustrating a first control panel. [Figure 3] 1 is an overall flow diagram of the operation of the tunnel air conditioning system. [Figure 4] FIG. 10 is a diagram for explaining a procedure for selecting and setting an operation mode. [Figure 5] FIG. 10 is a diagram for explaining the procedure for starting operation of the tunnel air conditioning system. [Figure 6] FIG. 10 is a diagram for explaining the procedure for starting operation of the tunnel air conditioning system. [Figure 7] FIG. 10 is a diagram for explaining the operation procedure of wind speed feedback control. [Figure 8] FIG. 10 is a diagram for explaining the operation procedure of wind speed feedback control. [Figure 9] FIG. 10 is a diagram for explaining the procedure for stopping the operation of the tunnel air conditioning system. [Figure 10] FIG. 10 is a diagram for explaining the procedure for stopping the operation of the tunnel air conditioning system. [Figure 11] 10A and 10B are diagrams illustrating an example of how a pipeline rehabilitation work is performed while switching the direction of the airflow. [Figure 12] 10A and 10B are diagrams illustrating an example of how a pipeline rehabilitation work is performed while switching the direction of the airflow. [Figure 13] 10A and 10B are diagrams illustrating an example of how a pipeline rehabilitation work is performed while switching the direction of the airflow. DETAILED DESCRIPTION OF THE INVENTION

[0018] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be illustrated and described with reference to the reference numerals attached to the various elements in the drawings. Each embodiment may be implemented not only alone, but also in combination with two or more embodiments, and the modified examples supplemented in each embodiment may also be applied to other embodiments. (First embodiment) A first embodiment of the present invention will be described. The present invention relates to a tunnel work method and a tunnel air-conditioning system for efficiently performing work inside a tunnel. A tunnel air-conditioning system will be described as a first embodiment. FIG. 1 is a diagram illustrating the configuration of a tunnel air-conditioning system according to a first embodiment of the present invention. The tunnel 10 is an existing tunnel that has already been penetrated. Once penetrated, work such as repair, renovation, rehabilitation, and inspection, as well as firefighting in the event of an accident inside the tunnel and removal of obstacles, occurs. A typical example is the pipe-in-pipe (PIP) method, which is a method for rehabilitating water pipes (water supply, sewerage, agricultural water) by installing a new pipe inside an existing, deteriorated pipe.

[0019] Tunnel 10 is a long, continuous structure, but to draw in new pipes, vertical shafts are installed every few hundred meters or every few kilometers, and these serve as portals that connect to the surface. In other words, in a certain section, the tunnel has a first portal 11, which is the portal on the first side, and a second portal 12, which is the portal on the second side. Tunnel air conditioning system 100 includes ventilation devices 110 and 120 and environmental measurement devices 210 and 220.

[0020] The tunnel air conditioning system 100 comprises, as ventilation devices, a first ventilation device 110 installed on the first tunnel entrance 11 side and a second ventilation device 120 installed on the second tunnel entrance 12 side. The first ventilation device 110 and the second ventilation device 120 differ in their installation locations, but have the same configuration. The configuration will be explained using the first ventilation device 110 as an example.

[0021] The first ventilation device 110 includes a first ventilator 111 , a first air duct 112 , a first air gate 113 , a first operation panel 114 , and a first control unit 115 .

[0022] The first ventilator 111 has a fan and a motor. Here, it is assumed that the operation is switched between air supply and exhaust by switching the rotation direction of a single fan, but it is also possible to provide separate devices dedicated to air supply and exhaust, and switch between the devices.

[0023] The first ventilator 111 is installed outside the shaft, and the inside of the tunnel 10 and the first ventilator 111 are connected by a first air duct 112.

[0024] The first wind gate 113 is a door installed near the tunnel entrance as a partition between adjacent tunnel sections. Ventilation efficiency is improved by closing at least one of the first wind gate 113 or the second wind gate (wind gate on the second tunnel entrance 12 side) 123. Note that under the construction conditions of the second embodiment described below, the wind gate on the air supply side cannot be closed all the time, so when the wind gates are closed, it is assumed that the wind gate on the exhaust side is closed. The wind gates may be opened and closed manually, or a controller (for example, the first control unit 115 of the first ventilation device 111) may control the opening and closing of the wind gates.

[0025] The first operation panel 114 is installed near the tunnel entrance 11 inside the tunnel 10. An example of the first operation panel 114 is shown in FIG. 2. The first operation panel 114 is provided with on / off buttons 131 / 134 and operation mode selection buttons 132 / 133. The on / off buttons 131 / 134 are buttons (input units) that switch the operation state of the first ventilation device 110 on and off. The on button 131 and the off button 134 may be separate, or may be combined into a single button. Alternatively, only the off button 134 may be provided, and the on button 131 may also serve as the operation mode selection button 132 / 133. The operation mode selection buttons 132 / 133 include an air supply operation selection button 132 that selects air supply operation, and an exhaust operation selection button 133 that selects exhaust operation.

[0026] It is preferable that the first operation panel 114 has a display panel that displays various messages. Note that the display panel may be a touch panel instead of buttons.

[0027] The first control unit 115 is a control device for the first ventilator 111. The first control unit 115 is communicatively connected to the first ventilator 111 and the first operation panel 114, and receives input operations from the first operation panel 114 to control the operation of the first ventilator 111 of its own device and to transmit and receive signals with the second control unit 125 of the other device (second ventilation device) 120. Here, the first control unit 115 has a wireless communication device and transmits and receives signals with the second control unit 125 of the other device (second ventilation device) 120 via wireless communication. It is assumed that communication with the monitoring monitor 300 will also be via wireless communication. Note that the communication connections between the first control unit 115, first ventilator 111, and first operation panel 114 within one first ventilation device 110 may be wired. A communication cable can be laid inside the shaft. On the other hand, the distance between one entrance (first entrance 11) and the other entrance (second entrance 12) is several hundred meters or even several kilometers, construction equipment is present inside the tunnel, new pipes must be installed inside the tunnel, and installing a communication cable between the first entrance (first entrance 11) and the other entrance (second entrance 12) along the entire length of tunnel 10 would pose a risk of the communication cable breaking when the retracting pipe is expanded. Therefore, it would be difficult to run a wired cable inside the tunnel to connect the control units of the first ventilation device 110 and the other device (second ventilation device 120). Furthermore, the ground above tunnel 10 is often a road in urban areas, making it difficult to run a wired cable above ground. Furthermore, in cultivated land, this would interfere with cultivation, and in forests, there is concern that the cable could be broken by animals. Therefore, it is desirable that communication between the device itself (first ventilation device 110) and another device (second ventilation device 120), and communication between the device itself 110 (or another device 120) and the monitoring monitor 300 be wireless communication via a wireless communication device.

[0028] The tunnel air-conditioning system 100 comprises environmental measuring devices 210, 220: a first environmental measuring device 210 installed on the first tunnel entrance 11 side, and a first environmental measuring device 220 installed on the second tunnel entrance 12 side. The first environmental measuring device 210 and the second environmental measuring device 220 differ in their installation locations, but have the same configuration. The configuration will be explained using the first environmental measuring device 210 as an example.

[0029] The first environment measuring device 210 includes a first anemometer 211 and a first dust meter 212 . The first anemometer 211 is installed near the first tunnel entrance 11, but is preferably installed an appropriate distance (several meters or a dozen meters, or if the airflow is still unstable, several tens of meters, for example 50 meters) inside from the tunnel entrance 11 so as to be less susceptible to turbulence in the airflow. The first anemometer 211 may transmit the wind speed values ​​measured every moment to the control unit (first control device 115) of its own device (first ventilation device 110), or may transmit the average (moving average) wind speed per (management) unit time to the control unit 115. Similarly, the first dust meter 212 will also be installed. The first environment measuring device 210 may also be any other gas concentration meter, such as a carbon dioxide concentration meter, a carbon monoxide concentration meter, an oxygen concentration meter, or a hydrogen sulfide meter. It is assumed that communication between the first environment measuring device 210 and the first control unit 115 is wireless communication via a wireless communication device.

[0030] It is desirable for the anemometer 211 to be able to determine not only the absolute value of wind speed but also wind direction (airflow direction). However, for example, in the first embodiment, the lower limit of wind speed is set to 0.8 m / s, and both entrances to tunnel 10 (first entrance 11, second entrance 12) are vertical shafts, preventing outdoor airflow from directly blowing into tunnel 10. In this state, if the wind speed required for tunnel work sufficiently exceeds the upper limit of 0.3 m / s defined by the Japan Meteorological Agency as a calm state, it is unlikely that the wind direction will reverse during wind speed control. Therefore, here (the anemometers 211, 221 used in this tunnel air-conditioning system 100) are not required to measure wind direction, but only to know the magnitude of the wind speed. The wind direction should be set or switched using the ventilation system's control panel 114 (124), and the control target value should be controlled based on the magnitude of the wind speed.

[0031] A monitoring monitor 300 is installed in a control room on the ground just outside the tunnel 10. The monitoring monitor 300 monitors the operating status of the ventilation devices (first ventilation device 110, second ventilation device 120) and measurements by the environmental measuring devices (first environmental measuring device 210, second environmental measuring device 220). Furthermore, when performing feedback control of the air conditioning (wind speed) inside the tunnel, a function for sending control commands to the ventilation devices (first ventilation device 110, second ventilation device 120) based on measurements (wind speed) by the environmental measuring devices 210, 220 may be added to the monitoring monitor 300. Because the ventilation status inside the tunnel 10 may be monitored from a construction office or the like located away from the tunnel 10, it is preferable that communication between the monitoring monitor 300, the ventilation devices (first ventilation device 110, second ventilation device 120), and the environmental measuring devices (first environmental measuring device 210, second environmental measuring device 220) be wireless communication via wireless communication devices.

[0032] (Tunnel air conditioning system operation) The operation of the tunnel air conditioning system will now be explained. Figure 3 is an overall flow chart of the operation of the tunnel air conditioning system. First, before turning on the tunnel air-conditioning system, the operating mode is selected and set in advance (ST100). Here, the operating mode includes two modes: 1) the operating side supplies air and the other side exhausts, and 2) the operating side exhausts air and the other side supplies air. In 1) and 2), the operating mode being on refers to an operating state in which the first ventilation unit 111 on the operating side and the second ventilation unit 121 on the other side are controlled in conjunction with each other by instructions from the operating side. This also includes a state in which at least one of the first ventilation unit 111 or the second ventilation unit 121 is stopped. To prevent a sudden reversal of the airflow, the tunnel air-conditioning system 100 only accepts forced airflow switching when the system is stopped. Furthermore, if the tunnel air-conditioning system 100 accepts an instruction to switch the airflow during operation, a wireless communication failure (e.g., loss of communication) could disrupt the interlock between the ventilation units on both sides, potentially leading to an accident if the worker is unaware of this.

[0033] (Operating mode selection setting) FIG. 4 shows the flow of control performed in the selection and setting of the operation mode (ST100). The operation mode selection setting (ST100) can be accepted from either the first operation panel 114 of the first ventilation device 110 or the second operation panel 124 of the second ventilation device 120. The supervisor determines the desired airflow direction in the tunnel based on a predetermined work plan and the progress of work inside the tunnel, and selects the operation mode on the nearest operation panel. For example, assume that the supervisor at the first tunnel entrance 11 presses the air supply operation selection button 132 on the first operation panel 114 of the first ventilation device 110. In other words, assume that the supervisor selects the first directional airflow, which is the airflow from the first tunnel entrance 11 to the second tunnel entrance 12.

[0034] When the first control unit 115 of the first ventilation device 110 detects that it has received an operation mode selection operation (ST110), the first control unit 115 checks whether the operation status of the air conditioning system 100 is off (ST120). The first control unit 115 is already aware of the operation status of its own device (first ventilation device 110) since it is its own device. For the operation status of the other device (second ventilation device 120), an inquiry (Ask) is sent to the other device 120 and a response is confirmed from the control unit (second control unit 125) of the other device (second ventilation device 120). If the operation status of the first device 110 is off and the operation status of the other device 120 is off, the first control unit 115 continues setting the operation mode, but if it cannot confirm that both the first device 110 and the other device 120 are off, the first control unit 115 discards the input operation mode selection operation. In this case, it is advisable to display a message on the display panel indicating that the operation mode selection operation will not be accepted.

[0035] If the operating status of the own device 110 is off, the operating status of the other device 120 should also be off, but the actual status of the other device several hundred meters away is unknown, and there is a possibility of unexpected inconveniences such as the device being turned off, being removed, not being installed yet, etc. Therefore, it is desirable to inquire about the operating status of the other device 120 and reliably receive and confirm the response.

[0036] If the operating status of the own device and the other device is off (ST120: YES), the operating mode of the own device 110 is set according to the instruction (here, air supply operating mode) (ST130), and the other device 120 is instructed to set the corresponding operating mode (here, exhaust operating mode) (ST140). It is even more preferable to receive a setting completion report (ST150) from the other device 120.

[0037] (Start of operation) Once the operation mode has been selected and set, operation begins (ST200). The control flow from the operator pressing the operation-on button 131 to the operation of the other ventilator (125 in the following example) and the operation of the host ventilator (115 in the following example) during operation start (ST200) is shown in FIGS. 5 and 6. Here, it is assumed that the operation-on button 131, which commands the start of operation, is located on the operation panel 114 separately from the operation mode selection input unit (air supply button 132 and exhaust button 133). However, the operation mode selection input unit (air supply button 132 and exhaust button 133) may also serve as the "operation-on input unit." In this case, once the operation mode selection operation is input and the operation mode setting is complete, the air conditioning system automatically starts operating.

[0038] The operation to turn on the operation can be accepted by the operation panel 114, 124 of either ventilation apparatus 110, 120. Here, it is assumed that an observer presses the operation on button 131 on the first operation panel 114 of the first ventilation apparatus 110 (ST210). Note that the relationship between the parent unit (master) that issues the control command and the child units (slave) that operate in accordance with the parent unit's command is such that the ventilation apparatus whose operation on button 131 was operated (in this example, the first ventilation apparatus 110) is the parent unit (master), and the other apparatuses are child units (slave). Then, until the series of operations stops, it commands the other apparatuses to start and stop the ventilation, as well as to increase or decrease the airflow. The control unit (first control unit 115) of the first apparatus (first ventilation apparatus 110) confirms that the operation status of both the first apparatus 110 and the other apparatuses 120 is off (ST220: YES), and then turns on the operation status of the first apparatus 110 (ST230). Then, an operation start command is transmitted to the other device (second ventilation device 120) (ST240).

[0039] When the other apparatus (second ventilation apparatus 120) receives the operation start command, the other apparatus (second ventilation apparatus 120) turns on the operation state (ST310) and simultaneously transmits a reception confirmation to the other apparatus (here, first ventilation apparatus 110) (ST320). Then, the other device (second ventilation device 120) starts the operation of the ventilation device (second ventilation device 125) (ST330). Here, it is assumed that the second ventilation device 120 has already been set to the exhaust operation mode, that is, the second ventilation device 121 performs the exhaust operation.

[0040] The output and wind speed target values ​​at initial startup will be described later.

[0041] The control unit (first control unit 115) of the own device (first ventilation device 110) may immediately start operating the ventilator 111 of its own device 110 after sending an operation start command to the other device 120 (ST240), but here, when the other device 120 receives the operation start command, it first starts operating the ventilator 121 of the other device 120, and after checking the change in wind speed on the other device's anemometer 221 (ST260), it starts operating the ventilator 111 of its own device 110 (ST270). (The threshold for determining changes in wind speed is set appropriately.) In addition, when the other device 120 receives an operation start command from its own device 110, it may send an operation start consent signal from the other device 120 to its own device 110 at the same time as the ventilator 121 of the other device starts operating, and upon receiving the operation start consent signal in its own device 110 (ST250), it may start operating the ventilator 111 of its own device 110 (ST270). Furthermore, when other device 120 receives an operation start command from its own device 110, other device 120 only transmits an operation start consent signal to its own device 110, and when its own device 110 receives the operation start consent signal from other device 120, it starts its own device 110 and transmits an operation start signal to other device 120, and when other device 120 receives the operation start signal from its own device 110, it starts operating the ventilator 121 of the other device, so that operation can be started using a double control signal. Here, it is assumed that the first ventilation device 110 is set to the air supply operation mode, and the first ventilation unit 111 performs the air supply operation.

[0042] The wind speed values ​​of the anemometers 211, 221 may be directly exchanged between the first control unit 115 and the second control unit 125, but the measurement values ​​of the environmental measurement devices (e.g., the first and second anemometers 211, 221) may be collected in the monitoring monitor 300, and the control units 115, 125 of the ventilation devices 110, 120 may inquire of the monitoring monitor 300.

[0043] If no change in wind speed is confirmed after a predetermined time has passed, this indicates some kind of error, and the control unit (first control unit 115) of the device itself (first ventilation device 110) displays a message on the operation panel 114 and also reports it to the monitoring monitor 300.

[0044] (Wind speed feedback control ST400) The flow of control performed in the wind speed feedback control (ST400) is shown in Figs. When the first ventilation fan 111 of the first ventilation device 110 and the second ventilation fan 121 of the second ventilation device 120 start operating, feedback control of the first ventilation fan 111 and the second ventilation fan 121 is performed so that the target wind speed is achieved. Here, the feedback control is performed by first control unit 115 on the device 110 side. Specifically, the device on which the operation on button 131 is operated commands the other device to increase or decrease the output of the ventilator, with the device acting as the master and the other device acting as the slave.

[0045] However, feedback control of the first ventilator 111 and the second ventilator 121 may be performed by the second control unit 125 of the second ventilation device 120 or the monitoring monitor 300, without relying on the first control unit 115 on the device 110 itself.

[0046] The target value of the wind speed is set appropriately taking into consideration regulations and the nature of the work. Regarding the lower limit of the target wind speed, from the viewpoint of safety and health, the stronger the wind speed, the better, since harmful dust and other particles are exhausted into the outside air. In this example, the minimum wind speed required for ventilation to deal with dust generated during arc welding work and the breath of workers is set to 0.8 m / s. However, the upper limit of the target wind speed is 2.0 m / s, as stipulated in the Ministry of Agriculture, Forestry and Fisheries' General Specifications for Facility Machinery Work, etc., which prohibit welding work. Furthermore, in this example, construction took place during the winter agricultural off-season, and because the pipes were through, temperatures inside the pipes sometimes dropped below 10°C. Therefore, the upper limit of wind speed for indoor work in low temperatures, as stipulated in Article 601, Paragraph 2 of the Industrial Safety and Health Regulations, is 1.0 m / s. Therefore, in this example, the target wind speed range is set to between 0.8 m / s and 1.0 m / s. Taking these factors into consideration, as well as the difficulty of precisely controlling wind speed in tunnels several hundred meters or kilometers long, the target wind speed (target wind speed range) is determined. Here, the target wind speed (hereinafter referred to as the "target value") as the control target value is set to 0.9 m / s, the median of the target wind speed range, with a tolerance of ±0.1 m / s.

[0047] Since anemometers 211 and 221 are installed near the entrances on both sides, the wind speed measurements from both anemometers could be used together, but here it is assumed that feedback control is performed based on the wind speed measurement from the anemometer 221 on the exhaust side. Note that the time interval for wind speed feedback control (ST400) is set to one minute, taking into account the time it takes for the wind speed to settle after changing the air volume. The flow of control performed by wind speed feedback control (ST400) is shown below with reference to Figures 7 and 8.

[0048] At the initial start of the ventilators (first ventilator 111, second ventilator 121), the ventilator in the air supply operation mode (here, first ventilator 111) starts operation with an initial air volume equivalent to the product of the cross-sectional area and the target air velocity, and the ventilator in the exhaust operation mode (second ventilator 121) starts operation with an initial air volume equivalent to the product of the cross-sectional area and the target air velocity, and although the initial air volume on the exhaust side may be 0, since starting from a stopped state consumes a large amount of power, the ventilator starts operation with a minimum output that is not 0 at the initial air volume on the exhaust side (ST401), and starts a timer until one minute later, which is the time for feedback control of the next air volume (ST402). At this time, if the target air volume is close to the maximum air velocity, the initial air volume may be the air volume equivalent to the maximum output. As a specific example, both the first ventilator 111 and the second ventilator 121 may start operation with a maximum air volume of 150 m / s when supplying air. 3 / min, and the maximum air volume during exhaust is 75m 3 At the start of the wind speed management, the first ventilator 111 sends out air at a maximum volume of 150 m 3 / min, and the second ventilation unit 121 blows air at 9m3, which is equivalent to 1 / 8 of the maximum air volume during exhaust. 3 Ventilation is started from a state in which the exhaust is performed at a rate of 1 / min (ST401). Here, in this example, the initial air volume of the first ventilator 111 on the air supply side is set to the maximum air volume for air supply because the cross-sectional area of ​​the pipe after installation of the steel pipe with an inner diameter of 1800 mm in this example is 2.5434 m 2 (=(1.8 ÷ 2) × (1.8 / 2) × 3.14), so even if air is sent at the maximum volume with no loss in the duct, the volume is 150 ÷ ​​2.5434 ÷ 60 = 0.98 m 3 / min, and does not exceed 1.0 m / sec, which is the upper limit of the range of the target wind speed. The reason why the initial air volume of the second ventilator 121 on the exhaust side is set to 1 / 8 of the maximum air volume for exhaust is that the ventilator consumes a lot of power when it starts operating, so it is desirable to operate the second ventilator 121 on the exhaust side at the minimum output in the initial state, and one unit of the amount of change in the air volume on the exhaust side in the feedback control of the wind speed in the duct, which will be described later, is set to 1 / 8 of the maximum air volume, and the air volume step is set to 0 m 3 / min, so the wind volume is 9m, which is one unit higher than the no-wind state. 3 / min is set as the initial state of the exhaust side. Also, the air gates 113 and 124 may be open or closed, and if we consider the case where both air gates 113 and 124 are closed, it may not be appropriate to set the initial air volume of the exhaust unit to zero. In this case, the air volume increase / decrease amount for one time (1 unit) on the exhaust side is set to 9 m 3 The reason for using this value is that when the maximum ventilation volume on the exhaust side is divided by 8, the change in wind speed is 9 ÷ 2.5434 ÷ 60 = 0.06 m / s, which is smaller than the allowable error of the target wind speed, 0.1 m / s, and is therefore considered to be suitable as an increase / decrease value for each feedback control.

[0049] When one minute has elapsed since the timer was started (ST403), the timer is stopped and feedback control is started every minute. In this example, the wind speed measurement value (moving average every minute) of the second anemometer 221 is compared with the target value (0.9 m / s) (ST404).

[0050] If the target value minus the measured value is 0 or more (ST404: YES), this means that the actual wind speed in the tunnel is weaker than the target value, and the process proceeds to ST405 in FIG. 7. In this case, if the target value minus the measured value is 0.1 or more (ST405: YES), this means that the actual wind speed is quite weak, and the process proceeds to ST406 in FIG. 7, where the air volume of the ventilation unit in air supply operation (here, for example, the first ventilation unit 111) is increased by one level (+19 m 3 / min) (ST407). Here, the set unit is 150 m3, which is the maximum air volume during ventilation operation. 3 / min (similar to the unit of 1 during exhaust operation) is divided into 8 (150 ÷ ​​8 ≒ 19 m 3 / min, 19 m 3 / min ÷ 2.5434m 2 ÷ 60 = 0.125 m / s). When the ventilation unit in air supply operation (for example, the first ventilation unit 111 in this case) is at the maximum air supply output (ST406: YES), the exhaust output of the ventilation unit in exhaust operation (for example, the second ventilation unit 121 in this case) is at the maximum (75 m 3 / min) (ST408: NO), proceed to ST409 in FIG. 7, and reduce the output of the ventilator in exhaust operation (second ventilator 121) by 1 unit (9 m 3 / min) (ST409). Then, the process returns to the beginning of the flow with the determined air volume, and ventilation continues at the same air volume for one minute (ST402, ST403). ST402-ST409 are repeated in a loop until the wind speed "target value - measured value" is between 0 m / s and 0.1 m / s, and eventually the wind speed measured value of the second anemometer, i.e., the wind speed inside the mine, stabilizes within the target wind speed range. Since the target wind speed was set to 0.9 m / s, the wind speed should be 0.8 m / s or higher.

[0051] If the wind speed is not within the target range even though both the air supply and exhaust are operating at maximum output, an error is reported to the supervisor from the monitor 300, for example (ST410).

[0052] If the target value minus the measured value is less than 0 (ST404: NO), the wind speed inside the tunnel is stronger than the target. In this case, if the target value minus the measured value is even smaller than -0.1 m / s (ST420: YES), the exhaust output of the ventilation unit in exhaust operation (second ventilation unit 121) is set to the minimum (9 m / s in this case). 3 / min) (ST421: NO), the output of the exhaust ventilation unit (secondary ventilation unit) is set to 1 unit (9 m 3 / min) (ST422). Then, the flow returns to the beginning (ST402) at the determined air volume, and ventilation is performed at the same air volume for one minute. The exhaust output of the ventilator in exhaust operation (second ventilator 121) is reduced to the minimum (9 m in this case). 3 / min) (ST421: YES), the air supply output of the ventilation unit in air supply operation (first ventilation unit 111) is set to the minimum (19 m 3 / min) (ST423: NO), the air supply output of the ventilation unit in air supply operation (first ventilation unit 111) is set to one unit (19 m 3 / min) (ST424). Then, return to the beginning of the flow (ST401) with the determined airflow rate and ventilate at the same airflow rate for one minute. By repeating this process until the target wind speed minus the measured value falls between -0.1 m / s and 0 m / s, the wind speed measured by the second anemometer 221, i.e., the wind speed inside the tunnel, will eventually stabilize within the target wind speed range. Since the target wind speed was set to 0.9 m / s, the wind speed should be below 1.0 m / s.

[0053] If the wind speed is not within the target range (ST423: YES) even though both the air supply and exhaust are operating at minimum output, an error is reported to the supervisor from the surveillance monitor 300, for example. If the tunnel 10 is several hundred meters or several kilometers long, the outside air pressure and wind speed may be unexpectedly different between the first entrance 11 and the second entrance 12, and even if the ventilators 111 and 121 are operating normally, it may not be possible to control the air flow inside the tunnel as intended.

[0054] (Suspension of operation) 9 and 10 show the flow of control performed when the operation of the air conditioning system 100 is stopped (ST500). When the operation of the air conditioning system 100 is stopped (ST500), the operation-off operation can be accepted from the operation panel 114, 124 of either ventilation apparatus 110, 120. Here, it is assumed that a monitor presses the operation-off button 134 on the first operation panel 114 of the first ventilation apparatus 110 (ST510). The control unit (first control unit 115) of the first apparatus (first ventilation apparatus 110) confirms that the operation status of both the first apparatus 110 and the other apparatus 120 is on (i.e., the first apparatus 110 and the other apparatus 120 are in an interlocked control state) (ST520: YES), and then stops operation of the ventilator (first ventilator 111) of the first apparatus (first ventilation apparatus 110) (ST530). Then, an operation-off command is transmitted to the other device (second ventilation device 120) (ST540).

[0055] When the other apparatus (second ventilation apparatus 120) receives the operation-off command (ST550: YES), the other apparatus (second ventilation apparatus 120) stops operation of the ventilation unit (second ventilation apparatus 121) (ST610). At the same time, it transmits a reception confirmation to the other apparatus (here, first ventilation apparatus 110) (ST620). Then, the other apparatus (second ventilation apparatus 120) turns off its operation state (ST630).

[0056] After sending an operation-off command to the other device 120, the control unit (first control unit 115) of the device itself (first ventilation device 110) confirms receipt confirmation from the other device (second ventilation device 120) (ST550: YES), and turns off the operation state of the device itself (first ventilation device) (ST560).

[0057] If you want to change the direction of the airflow and restart after turning off the operation state, return to the operation mode selection setting, select the operation mode (select the direction of the airflow), and resume operation.

[0058] This tunnel air conditioning system makes it possible to forcibly change the direction of airflow inside the tunnel. At the same time, the above-described feedback control of the wind speed inside the tunnel makes it possible to automatically maintain the wind speed inside the tunnel within a certain range. Furthermore, this embodiment makes it possible to reliably link ventilation devices that are separated by hundreds of meters or even kilometers, ensuring the safety and hygiene of workers inside the tunnel.

[0059] Second Embodiment A second embodiment of the present invention will now be described. (Work inside the tunnel) By switching the airflow direction using the tunnel air conditioning system described in the first embodiment, hazardous work and general work can be performed in parallel, enabling efficient work inside the tunnel. Here, we will explain the pipe-in-pipe (PIP) method, one of the pipeline rehabilitation methods, as an example. One type of pipe-in-pipe method is the pipe-in-pipe method using a retracted pipe. The pipe-in-pipe method using a retracted pipe allows for the installation of a new pipe inside the existing pipe with a diameter close to that of the existing pipe, thereby enabling the rehabilitation of aging pipelines with minimal cross-sectional reduction. However, installing a new pipe requires welding (bonding) in the axial and circumferential directions, which generates hazardous substances during the welding (bonding) process. Such work involving the generation of hazardous substances (hazardous work) is performed by qualified, professionally trained workers wearing protective clothing and dust masks. Personnel performing other general work are not allowed inside the tunnel while hazardous work is being performed. Therefore, the pipe-in-pipe method using a retracted pipe is a time-consuming (day-consuming) construction project.

[0060] In this embodiment, we propose that the tunnel air conditioning system controls the direction and speed of the airflow inside the tunnel, ensuring a safe and hygienic environment on the upwind side of the area where hazardous work is being carried out, allowing hazardous work and general work to be carried out in parallel inside the tunnel, dramatically shortening the construction period.

[0061] The pipe-in-pipe method using rolled-up pipes mainly involves the following three processes: If the rolled-up pipe is made of steel (rolled steel pipe), there is a subsequent process of painting the inside of the steel pipe, but this process is generally not carried out simultaneously with other processes, either upstream or downstream, in order to prevent dust and other particles from adhering to the painted surface before it dries, so this process will be omitted from the explanation of this example. (1) Pull-in installation process (pulling work) (2) Connection process (connection work) (3) Backfilling process

[0062] (1) In the pulling-in installation process, the new pipe is cut in the axial direction of the pipe and rolled up into a small roll, which is then pulled into the tunnel, placed in the designated position, and expanded for installation. (2) In the connection process, the cut section along the pipe axis is first connected (welded) to form a pipe, and then the pipe is pulled to the new pipe that has already been installed, and the circumferential direction is connected. If it is a steel pipe, it is welded, and if it is a resin pipe such as a PVC pipe, it is glued with an organic solvent. (3) The backfilling process is a process of filling mortar or the like between the existing old pipe and the new pipe on the inside.

[0063] The connection process is a harmful task and is also the most time-consuming critical path. The lead-in installation process and backfilling process are general tasks. As an example, let's assume that one harmful task (connecting one pipe) takes two hours and one general task (leading-in work) takes one hour. In this case, we consider the possibility of controlling the airflow inside the tunnel to carry out the harmful task and general work simultaneously, thereby shortening the total work time (construction period).

[0064] The procedure for pipe rehabilitation will be described with reference to Figures 11, 12, and 13. Note that in Figures 11 to 13, the tunnel air-conditioning system 100 is shown in a simplified or omitted form due to space limitations. When rehabilitating a tunnel, construction begins in the center between the first and second portals 11 and 12. In Figure 11, new pipes are installed starting from the center of the tunnel, and then new pipes are installed from the center toward both portals. In Figure 11, welding of the two most recently installed new pipes is underway at both ends of the new pipes installed sequentially from the center of the tunnel toward the portals on both sides of the first and second portals 11 and 12. At this time, a first-direction airflow is ensured from the first portal 11 toward the second portal 12. Since the first portal 11 side, which is upwind of the welding section, is free of hazardous materials, general work can be performed. Work that can be performed on the first portal 11 side, which is upwind of the welding section, is called first-side safe work. In other words, new pipes can be pulled in from the first portal 11, transported through the tunnel, and unfolded and placed at the next installation location.

[0065] Then, as shown in Figure 12, the direction of the airflow is changed to ensure a second-direction airflow from the second tunnel entrance 12 to the first tunnel entrance 11. Since the second tunnel entrance 12 side, which is upwind of the welding section, is free of hazardous materials, general work can be performed. The work that can be performed on the second tunnel entrance 12 side, which is upwind of the welding section, is called second-side safe work. That is, new pipe can be pulled in from the second tunnel entrance 12, transported through the tunnel, and unfolded and placed at the next installation location. Next, as shown in Figure 13, a first-direction airflow from the first tunnel entrance 11 to the second tunnel entrance 12 is ensured, and since the first tunnel entrance 11 side, which is upwind, is free of hazardous materials, general work (e.g., pulling and installation) can be performed.

[0066] As a result, while welding work is being carried out, the airflow inside the tunnel is alternately switched between a first direction airflow, in which the air flows from the first entrance 11 to the second entrance 12, and a second direction airflow, in which the air flows from the second entrance 12 to the first entrance 11, and by carrying out the new pipe pulling work on the upwind side of the airflow, the next new pipe to be installed and fixed can be brought in from the entrances on both sides of the tunnel. And since the pulling work has already been completed, the next welding work can be done without waiting. In this way, the construction period can be dramatically shortened compared to conventional methods.

[0067] In the above example, it was assumed that the hazardous work would take longer than the regular work, but even if the regular work took longer than the hazardous work, the construction period could still be shortened if the air current direction was changed so that the regular work was upwind while the regular work continued, and the hazardous work could be carried out simultaneously on the downwind side.

[0068] The present invention is not limited to the above-described embodiment, and can be modified as appropriate within the scope of the invention. In the above embodiment, the selection of the operation mode (selection of the airflow direction) and switching are explained as an example in which an observer manually operates the control panel, but if the timetable or daily schedule of the work content is determined in advance, an operation program can be created accordingly, and the operation program can be stored, for example, in the surveillance monitor, the first control unit, or the second control unit, so that operation start / stop and mode (airflow direction) switching can be performed automatically. Furthermore, in this example, when increasing the airflow rate, the airflow rate of the blower is first maximized and then the airflow rate of the exhauster is increased, but it is also possible to maximize the airflow rate of the exhauster first and then maximize the airflow rate of the blower. Similarly, in this example, when decreasing the airflow rate, the airflow rate of the exhauster is first minimized and then the airflow rate of the blower is reduced, but it is also possible to minimize the airflow rate of the blower first and then reduce the airflow rate of the exhauster. And, regarding the minimum airflow rate of the blower and exhauster, taking into account that a large amount of power is consumed at startup, the minimum value of the blower is set to 19 m 3 / min, exhaust fan is 9m 3 / min, but to ensure a larger range of air volume change, the minimum output of the air blower and exhauster was set to 0m 3 / min may also be used. [Explanation of symbols]

[0069] 10. Tunnel 11 First well mouth 12 Second well mouth 100 Tunnel air conditioning system 110 First ventilation system 111 First Ventilation Machine 112 First Wind Pipe 113 Daiichifumon 114 First operation panel 131 On button 132 Air supply operation selection button 133 Exhaust operation selection button 134 Off button 115 First Control Section 120 Second ventilation system 121 Second Ventilation Machine 122 Second wind pipe 123 Second wind gate 124 Second operation panel 125 Second Control Section 210 First environment measurement device 211 First anemometer 212 First dust meter 220 Second environment measuring device 221 Second anemometer 222 Second dust meter 300 Surveillance Monitor

Claims

1. A method for working inside a tunnel, the method comprising: performing work inside a tunnel having a first entrance which is a first side entrance and a second entrance which is a second side entrance, In carrying out hazardous work that emits hazardous substances and general work that does not emit hazardous substances within the tunnel, a first-side safety work in which the general work is carried out in parallel on a first side of the hazardous area where the hazardous work is being carried out, with the airflow in the tunnel being a first-direction airflow from the first entrance to the second entrance; and second-side safety work, in which the general work is carried out in parallel on the second side of the hazardous area where the hazardous work is being carried out, with the airflow in the tunnel being a second-direction airflow from the second tunnel entrance toward the first tunnel entrance; The work inside the tunnel is carried out by switching between the first side safety work and the second side safety work every hour. A method for working inside a tunnel.

2. In the tunnel work method according to claim 1, An air conditioning system is installed in the tunnel that switches the airflow in the tunnel between a first direction airflow from the first tunnel entrance to the second tunnel entrance and a second direction airflow from the second tunnel entrance to the first tunnel entrance; The air conditioning system switches the airflow in the tunnel between the first direction airflow and the second direction airflow, The work inside the tunnel is carried out by switching between the first side safety work and the second side safety work every hour. A method for working inside a tunnel.

3. In the tunnel work method according to claim 1, Work is started in the tunnel from an area at or near the center between the first and second entrances, and then work is carried out in parallel toward both the first and second entrances. A method for working inside a tunnel.

4. In the tunnel work method according to claim 1, The general work is the work of pulling a new pipe into the tunnel, The harmful work is the work of fixing the new pipe that has been pulled in. A method for working inside a tunnel.

5. A tunnel air conditioning system that is installed in a tunnel having a first entrance which is a first side entrance and a second entrance which is a second side entrance, and that switches the airflow in the tunnel between a first direction airflow from the first entrance to the second entrance and a second direction airflow from the second entrance to the first entrance, A first ventilation device is installed on the first tunnel entrance side and switches between sending outside air into the tunnel from the first tunnel entrance and exhausting the air inside the tunnel to the outside air from the first tunnel entrance; a second ventilation device that is installed on the second tunnel entrance side and that switches between an air supply that sends outside air into the tunnel from the second tunnel entrance and an exhaust that discharges the air inside the tunnel to the outside air from the second tunnel entrance. A tunnel air conditioning system characterized by:

6. In the tunnel air conditioning system according to claim 5, the first ventilation device and the second ventilation device are communicatively connected via wireless communication, The first ventilation device and the second ventilation device each have, as operation mode selection means, an air supply operation selection input unit that selects air supply operation and an exhaust operation selection input unit that selects exhaust operation, one of the first ventilation device and the second ventilation device that has received an operation mode selection operation from a user is designated as a local device, and the other is designated as a second device; When the device itself has confirmed that its own operating state is off and that the other device is also off, the device sets its own operating mode to one of an air supply operating mode and an exhaust operating mode in accordance with the operating mode selection operation received from the user, and transmits an operating mode setting command to the other device to set it to the other of the air supply operating mode and the exhaust operating mode; The other device sets the other of the air supply operation mode and the exhaust operation mode in accordance with the received operation mode setting command. A tunnel air conditioning system characterized by:

7. In the tunnel air conditioning system according to claim 5, the first ventilation device and the second ventilation device are communicatively connected via wireless communication, The first ventilation device and the second ventilation device each include a ventilation device that generates an airflow using a fan and a motor, and a control unit that controls the operation of the ventilation device, The first ventilation device and the second ventilation device each have an operation-on input unit, one of the first ventilation device and the second ventilation device that has received an operation-on operation from a user is designated as a local device, and the other is designated as a second device; When the device itself has confirmed that its own operating state is off and that the other device is also off, the device turns on the operating state of the device itself and transmits an operation start command to the other device; The other device that has received the operation start command turns on the operation state of the other device and transmits a receipt confirmation to the own device, and the other device starts the other of the air supply operation and the exhaust operation of the ventilation equipment of the other device, After receiving the receipt confirmation from the other device, the device starts one of the air supply operation and the exhaust operation of the ventilation device of the device. A tunnel air conditioning system characterized by:

8. In the tunnel air conditioning system according to claim 7, After checking the change in the measurement value of the anemometer installed in the tunnel, the device starts one of the air supply operation and the exhaust operation of the ventilation equipment of the device. A tunnel air conditioning system characterized by:

9. In the tunnel air conditioning system according to claim 5, the first ventilation device and the second ventilation device are communicatively connected via wireless communication, The first ventilation device and the second ventilation device each include a ventilation device that generates an airflow using a fan and a motor, and a control unit that controls the operation of the ventilation device, The first ventilation device and the second ventilation device each have an operation-off input unit, one of the first ventilation device and the second ventilation device that has received an operation-off operation from a user is designated as a local device, and the other is designated as a second device; When the device itself has confirmed that its own operation state is on and that the other device is also in an on state, the device stops the ventilation equipment of the device itself and transmits an operation-off command to the other device; The control unit of the other device that has received the operation-off command stops the ventilation equipment of the other device and transmits a receipt confirmation to the own device, and then turns off the operation state of the other device; After receiving the receipt confirmation from the other device, the device turns off the operation state of the device. A tunnel air conditioning system characterized by:

10. In the tunnel air conditioning system according to claim 5, Based on a moving average of the measured values ​​of an anemometer installed inside the tunnel and a preset target value of the wind speed, the first ventilation device and the second ventilation device are feedback-controlled so that the wind speed inside the tunnel falls within a range set by the target value. A tunnel air conditioning system characterized by:

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