JP2020010359A - Tunnel disaster prevention system - Google Patents

Abstract

To make it possible to adequately determine a situation of insulation deterioration by continuing measurement and recording of line current without being disturbed by warning of current value abnormality even when the warning of current value abnormality is obtained via periodical measurement of current of a signal line to which a terminal apparatus is connected.SOLUTION: A tunnel disaster prevention system performs monitoring by connecting a terminal apparatus including a notification device and detector 16, 18 to a signal line drawn out from a disaster prevention reception board 10 into a tunnel. The disaster prevention reception board 10 includes line current monitoring means 72 for measuring and recording, in each predetermined period, a value of current flowing through the signal line to which the terminal apparatus is connected, determining current value abnormality and originating warning before notifying an external remote supervisory control facility 27 of the current value abnormality to make the facility originate warning when the measured value of current is equal to or larger than a predetermined threshold or exceeds the threshold, and canceling the current value abnormality before resuming current value measurement in each predetermined period when recovery operation by the disaster prevention reception board 10 or the remote supervisory control facility 27 is detected.SELECTED DRAWING: Figure 2

Description

  TECHNICAL FIELD The present invention relates to a tunnel disaster prevention system that connects terminal devices such as a notification device and a detector installed in a tunnel to a disaster prevention receiver to monitor an abnormality in the tunnel.

  2. Description of the Related Art Conventionally, an emergency facility is installed in a tunnel such as a motorway to protect persons and vehicles from a fire accident occurring in the tunnel.

Such emergency facilities are provided with fire detectors, manual notification devices, and emergency telephones for monitoring and reporting fires, and fire hydrant devices for extinguishing fires and preventing fire spread. To protect the inside of the duct from fire, a water spray that sprays water for fire extinguishing from a water spray head is installed, and a disaster prevention receiver that monitors and controls the terminal equipment of these emergency facilities is built to construct a tunnel disaster prevention system. are doing.

  Tunnel disaster prevention systems composed of disaster prevention receivers and terminal devices are broadly classified into R-type transmission systems and P-type direct transmission systems. The R-type transmission system enables individual management by connecting a terminal device such as a fire detector having an address set to a transmission line and performing detection and control for each terminal device by transmission control. In the P-type direct transmission method, a plurality of terminal devices belonging to the same block are connected to a signal line drawn out in block units and are detected and controlled in signal line units.

  The tunnel type disaster prevention system of the R-type transmission system has various advantages in terms of functions and management since detection and control can be individually performed by terminal devices. On the other hand, the tunnel type disaster prevention system of the P-type direct transmission system does not need to provide a transmission control function in the fire detector, and it is not necessary to provide a relay amplifier even if the transmission distance is long. The system configuration is simple and inexpensive in comparison.

  Considering the advantages and disadvantages of the R-type transmission method and the P-type direct transmission method, the tunnel length and the traffic volume of vehicles, etc., a tunnel disaster prevention system with an R-type transmission method or a P-type direct transmission method should be constructed. I have to.

  By the way, in the tunnel disaster prevention system of the P-type direct delivery system, terminal devices such as a manual notification device, a fire hydrant activation device, and a duct temperature detector configure a signal output unit by operation or detection as a no-voltage a contact switch, A no-voltage a-contact switch is connected to a signal line drawn from the disaster prevention receiver. The no-voltage a-contact switch is normally off in the monitoring state, and is turned on by an operation or a detection operation to output a no-voltage contact signal.

Specifically, the power supply voltage is applied from the disaster prevention receiver side to one of the signal lines via a pull-up resistor, and in a steady monitoring state in which the no-voltage a-contact switch is turned off, almost no current flows through the signal line. Instead, the power supply voltage between the signal lines as viewed from the disaster prevention receiver is maintained at substantially the power supply voltage. When the no-voltage a contact switch is turned on, a current flows through the signal line, the voltage between the signal lines as seen from the disaster prevention receiver drops to approximately zero volts, and the disaster prevention receiver increases the current consumption of the signal line or between the signal lines. A voltage drop is detected and a reception signal indicating operation or detection of the terminal device is output to the control unit.

  For example, in the case of a fire notification signal from a manual notification device, the disaster prevention receiver performs control operations such as display of a fire, lighting control of a response lamp on a terminal side, display of a manual notification section, and output of a fire extinguishing pump start signal, and remote monitoring. A fire alarm signal is sent to external equipment such as control equipment, TV monitoring equipment, variable road information board equipment, tunnel ventilation equipment, lighting equipment, etc., and predetermined countermeasures are performed.

JP 2002-246962 A JP-A-11-128381

  By the way, in such a conventional P-type direct transport type tunnel disaster prevention system, the insulation is deteriorated due to aging of a signal line (external cable) connecting the terminal device, and the terminal device is connected. A current greater than expected in the normal monitoring state flows through the signal line, and the disaster prevention receiver performs an alarm operation by judging that a signal has been received by operating or detecting the terminal device, and performs remote monitoring control equipment, television monitoring equipment, variable It is often the case that other facilities such as a roadside information board facility, a tunnel ventilation facility, a lighting facility, etc. are interlocked and a tunnel is closed.

  In order to solve this problem, the current flowing in the signal line connected to the terminal device provided with the no-voltage a-contact switch in the disaster prevention receiver is periodically measured and recorded, for example, once a day, and further recorded. When the measured current exceeds a predetermined threshold, determine the current value abnormality of the signal line and give an alarm, and further send the signal line current value abnormality signal from the disaster prevention receiver to the remote monitoring control equipment to give an alarm. Is considered.

  If the disaster prevention receiver is equipped with a function to monitor the insulation deterioration by measuring and recording the current value of the signal line, even if an abnormal current value occurs and a warning is given, the signal that caused the abnormal current value immediately Do not perform maintenance such as replacing the line to recover from the fault, and plan and respond to signal line replacement work while judging the progress of signal line insulation deterioration based on the current value measurement record. Thus, it takes a certain period of time to recover from a failure by exchanging signal lines.

  However, when the current value abnormality is determined and an alarm is issued, the current value abnormality is determined every time the current measurement is performed periodically, and the alarm output is repeatedly performed in the disaster prevention receiver and the remote monitoring control device. It is necessary to take measures against the alarm output, and there is a problem that the monitoring of the tunnel is hindered.

  The present invention measures the current of a signal line to which a terminal device is connected, and periodically warns the abnormal current value even if the abnormal current value is alarmed. It is an object of the present invention to provide a tunnel disaster prevention system which can accurately judge a situation of a tunnel.

(Recovery operation for abnormal current value)
The present invention relates to a tunnel disaster prevention system for monitoring by connecting a terminal device to a signal line drawn into a tunnel from a disaster prevention receiver,
Measure the current value flowing in the signal line, determine that the current value is abnormal when the measured current value is equal to or more than the predetermined threshold value or exceeds the predetermined threshold value, and transmit the current value abnormality signal to external equipment A line current monitoring means for giving an alarm is provided.

  The line current monitoring means suspends the measurement of the current value when it is determined that the current value is abnormal.

  The line current monitoring means records a measured current value flowing through the signal line.

  The line current monitoring means releases the alarm of the abnormal current value when a predetermined recovery operation by the disaster prevention receiver or the external equipment is detected.

  The line current monitoring means restarts the measurement of the value of the current flowing through the signal line when a predetermined recovery operation by the disaster prevention receiver or external equipment is detected.

(Change of threshold)
The line current monitoring means sets a threshold value for judging a current value abnormality for each line, and when it is judged that the current value is abnormal, it changes a predetermined threshold value, making it difficult to determine that the current value is abnormal as compared to before the change. To be.

(Current value measurement mask)
When the line current monitoring unit determines that the current value is abnormal in any of the plurality of signal lines, the line current monitoring unit excludes the signal line determined to be abnormal in the current value from the current value measurement target.

(Judgment of abnormal current value related to environmental conditions)
The line current monitoring means measures a predetermined environmental condition together with the current value of the signal line, and determines an abnormal current value according to the measured current value of the signal line and the environmental condition.

(Change of threshold value due to environmental conditions)
The line current monitoring means changes a predetermined threshold value for determining an abnormal current value based on a measurement result of a predetermined environmental condition.

(Change of threshold value according to temporal change of environmental conditions)
The line current monitoring means changes a predetermined threshold for determining that the current value is abnormal for a predetermined period based on a measurement result of a predetermined environmental condition.

(Change threshold value according to season and time of day)
The line current monitoring means changes a predetermined threshold value for determining that the current value is abnormal based on a measurement result of a predetermined environmental condition in a seasonal or daily time zone according to the seasonal or daily time zone.

(Change threshold value according to high temperature and high humidity and low temperature drying)
The line current monitoring means sets a predetermined threshold value in advance as a predetermined reference threshold value, and changes the reference threshold value to a higher threshold value when it is determined as high temperature and high humidity from the measurement result of the predetermined environmental condition, When it is determined from the measurement result that the drying is at a low temperature, the reference threshold is changed to a lower threshold.

(External notification if current value abnormality continues for a predetermined number of times)
The line current monitoring means sends a current value abnormality signal to an external facility to alert when an abnormal current value is determined for the same signal line continuously for a predetermined number of times.

(If the current value is abnormal, shorten the cycle and measure and record the current value)
The line current monitoring means measures the current value of the signal line at predetermined intervals, and if it is determined that the current value of the signal line is abnormal at the measurement of the signal line at predetermined intervals, the signal line determined to be abnormal is detected. The current value of the signal line is measured for each cycle shorter than the predetermined cycle.

(Report to upper-level equipment and stop report)
The line current monitoring means sends a current value abnormality signal to an external facility to make an alarm when it is determined that the current value is abnormal, and then cancels the alarm when a predetermined time has elapsed since the notification.

  Further, the line current monitoring means sets the predetermined threshold to a predetermined lower threshold lower than the current value normally flowing through the signal line, and the current value measured by the line current monitoring means is equal to or less than the lower threshold or lower than the lower threshold. In this case, it is determined that the current value is abnormal.

(Effect of restoration operation of abnormal current value)
The present invention relates to a tunnel disaster prevention system for monitoring by connecting a terminal device including a notification device and a detector to a signal line drawn into a tunnel from a disaster prevention receiver. Measures and records the flowing current value, and when the measured current value is equal to or greater than a predetermined threshold value, determines that the current value is abnormal and issues an alarm, and sends a current value abnormality signal to an external host equipment to issue an alarm When a recovery operation by the disaster prevention receiver or higher-level equipment is detected, line current monitoring means is provided to release the abnormal current value and restart the current value measurement at predetermined intervals. Even if an alarm occurs and a warning is issued, by performing a recovery operation, it is possible to continuously measure and record the current value alarm, and determine the tendency of insulation deterioration of the signal line from the change in the recorded current value. Properly Possible to be.

(Effect of changing the threshold)
Further, the line current monitoring means sets a threshold value for determining a current value abnormality for each line, and when it is determined that the current value is abnormal, the threshold value is changed so as not to determine the current value abnormality. Even if a current value abnormality occurs and an alarm is issued, the threshold value is changed to a higher value, for example, so that the current value is not abnormally determined. The alarm of abnormal value is not issued, and the current value can be measured and recorded continuously without bothering with the alarm of abnormal current value, and the tendency of insulation deterioration in the signal line is judged from the change of the recorded current value. And make it possible to deal with it appropriately.

(Effect of current value measurement mask)
In addition, when the line current monitoring unit determines that the current value is abnormal in any of the plurality of signal lines, the line current monitoring unit suppresses the measurement of the current value of the signal line determined to be abnormal, so that the current value abnormality is determined. By excluding the signal line from the measurement target, even if insulation deterioration occurs in a specific signal line, measurement and recording of the current value of another signal line can be continued.

(Effect of judging abnormal current value related to environmental conditions)
Further, the line current monitoring unit measures predetermined environmental conditions together with the current value of the signal line, and determines an abnormal current value in relation to the measured environmental conditions. One or both of the humidity is measured, and the threshold value for judging the current value abnormality is changed in accordance with one or both of the temperature and the humidity. Specifically, the line current monitoring means sets a predetermined reference threshold value. To be set in advance, the reference threshold is changed to a higher threshold when it is determined to be high temperature and high humidity from temperature and humidity, and the reference threshold is changed to a lower threshold when it is determined to be low temperature drying from temperature and humidity. For example, when insulation degradation temporarily occurs due to environmental conditions such as high temperature and high humidity, by changing the threshold value according to the change in environmental conditions, it is possible to avoid being determined that the current value is abnormal, and to output an unnecessary alarm output. It makes it possible to deter the deer.

(Effects of threshold changes according to temporal changes in environmental conditions)
Further, the line current monitoring means changes the threshold value for determining the current value abnormality based on the environmental conditions and the temporal measurement result of the current value over time, for example, one or both of temperature and humidity and the current value. Based on the time measurement results, the threshold value for judging the current value abnormality was temporally changed, so that the log that is the measurement result of the temperature or humidity and the current value was artificially confirmed, for example, when the temperature and humidity became high. The threshold value is changed to a higher value from June to September when the current value tends to increase, and the threshold value is increased during a time period of one day, for example, from 10:00 to 18:00 when the temperature is high. By changing the threshold value according to the temporal change of the environmental condition, it is possible to prevent the current value from being determined to be abnormal, and to suppress unnecessary alarm output.

(Effect of higher-level notification when current value abnormality continues a predetermined number of times)
In addition, the line current monitoring means sends a current value abnormality signal to a higher-level facility to alert when a current value abnormality is determined to be continued for a predetermined number of times. Even if insulation deterioration occurs, unless the insulation deterioration continues, even if it is determined that the current value is abnormal, the current value abnormality signal is not transmitted to the upper-level equipment, for example, a remote monitoring control equipment, etc. It is possible to suppress unnecessary alarms.

(Effect of measuring and recording the current value by shortening the cycle when a current value abnormality occurs)
When the current value of the signal line is determined to be abnormal in the measurement of the current value of the signal line at a predetermined cycle, the line current monitoring means measures and records the current value of the signal line at a predetermined second cycle shorter than the predetermined cycle. For this reason, for example, when it is determined that the current value is abnormal by measuring the current value once a day at a predetermined cycle, the signal line is determined to be abnormal by changing the current value to a shorter second cycle, for example, an hour. The current value is measured and recorded at short time intervals, so that a change in the current value due to insulation deterioration can be more accurately grasped and dealt with.

(Effects of reporting to higher-level equipment and stopping reporting)
In addition, the line current monitoring means transmits a current value abnormality signal including signal line information to a higher-level facility to be alerted when it is determined that the current value is abnormal, and when a predetermined time has elapsed from the notification, the current value abnormality is detected. Since the signal transmission is stopped and the alarm is released, even if the disaster prevention receiver determines that the current value of the signal line is abnormal and outputs an alarm, the external upper-level equipment, for example, a remote monitoring and control equipment, requires a predetermined value. Only the alarm of the abnormal current value is output only during the time, and it is possible to prevent the alarm state of the abnormal current value from continuing and hindering the management work.

Explanatory diagram showing the outline of the tunnel disaster prevention system Block diagram showing an outline of the functional configuration of the tunnel disaster prevention system Block diagram showing details of P-type transmission unit Circuit block diagram showing details of the current measurement unit Flowchart showing a first embodiment of line current monitoring control for releasing an alarm of a current value abnormality by a recovery operation Flowchart showing a second embodiment of line current monitoring control for canceling a current value abnormality alarm by changing a threshold value Flowchart showing a third embodiment of the line current monitoring control for masking the current value measurement of a line having an abnormal current value Flowchart showing a fourth embodiment of line current monitoring control for determining a current value abnormality based on a threshold value according to environmental conditions Flow chart showing a fifth embodiment of the line current monitoring control for notifying the host equipment when the current value abnormality exceeds a predetermined number of times. Flow chart showing a sixth embodiment of line current monitoring control for measuring and recording a current value by shortening a measurement cycle when it is determined that a current value is abnormal. A flow chart showing a seventh embodiment of the line current monitoring control for notifying a higher-level equipment for a certain period of time and making an alarm when a current value abnormality is determined.

[Overview of tunnel disaster prevention system]
FIG. 1 is an explanatory diagram showing an outline of a tunnel disaster prevention system. As shown in FIG. 1, an up line tunnel 1 a and a down line tunnel 1 b are constructed as tunnels for a motorway, and the up line tunnel 1 a and the down line tunnel 1 b are connected by an evacuation connection tunnel 2.

Inside the up line tunnel 1a and the down line tunnel 1b, fire detectors 16 are installed at intervals of, for example, 25 meters or 50 meters along the wall surface in the longitudinal direction of the tunnel. The fire detector 16 sets a monitoring area on both sides of 25 meters or 50 meters on the left and right sides, detects a flame due to a fire, and issues a fire alert.

  In addition, ducts and cables are laid with ducts formed inside the observer passages in the longitudinal direction of the tunnels in the up line tunnel 1a and the down line tunnel 1b. 18 are installed. The duct temperature detector 18 detects a temperature rise in the duct due to a cable fire or the like, and outputs a temperature detection signal when a non-voltage a contact switch functioning as a contact means is turned on.

  In addition, inside the up line tunnel 1a and the down line tunnel 1b, a fire hydrant device 20 and an automatic valve device 22 are installed at intervals of, for example, 50 meters along a wall surface of a guard path in the longitudinal direction of the tunnel.

  The fire hydrant device 20 houses a hose with a nozzle in the fire hydrant door. In the event of a fire, open the fire hydrant door, pull out the hose with the nozzle, and open the fire hydrant valve opening / closing lever to discharge water for fire extinguishing. The switch turns on and starts the fire pump. The fire hydrant device 20 is provided with a fire extinguisher door, in which the fire extinguisher is housed.

  In addition, the fire hydrant device 20 is provided with a water tap used by the fire brigade, and a pump start switch operated by a fire brigade member is provided accordingly. Further, the fire hydrant device 20 is provided with a notification device door, and the notification device door is provided with a manual notification device (transmitter). For this reason, the hydrant device 20 includes a transmitter, a hydrant valve opening / closing detection switch, and a pump start switch as terminal devices, and a fire notification signal, a hydrant detection signal or Outputs pump start signal.

  The hydrant valve open / close detection switch and the pump start switch are the same switch in terms of a system that outputs the same pump start signal. Therefore, hereinafter, the hydrant valve open / close detection switch (including the pump start switch) will be described. There is. The manual notification device is installed in the emergency telephone booth in addition to the fire hydrant device 20, but in the following description, the manual notification device provided in the fire hydrant device 20 will be described as a representative.

  The automatic valve device 22 constitutes a water spraying device, and opens and drives the main valve by remote opening control of an operating electric valve, and discharges fire extinguishing water from a plurality of water spraying heads installed in a longitudinal direction on an upper portion of a tunnel wall surface. To protect the tunnel frame from fire. For this reason, the automatic valve device 22 is provided with an operating electric valve as a terminal device.

  To monitor the abnormalities in the tunnel by connecting terminal equipment such as the fire detector 16, the temperature detector 18 in the duct, the fire hydrant device 20, and the automatic valve device 22 installed in the tunnel. A receiving panel 10 is provided.

  From the disaster prevention receiver 10, a plurality of P-type signal lines 12 are drawn out into the up line tunnel 1a and the down line tunnel 1b for each predetermined section divided in the longitudinal direction of the tunnel, and the fire detector 16 installed in the tunnel is installed. Connected.

  In addition, a plurality of P-type signal lines 12 are drawn from the disaster prevention receiver 10 into the up line tunnel 1a and the down line tunnel 1b by dividing the inside of the tunnel into longitudinal sections and terminal device types. As terminal devices other than the fire detector 16, terminal devices such as a manual notification device provided in the fire hydrant device 20, a fire hydrant valve opening / closing detection switch (including a pump activation switch), and a duct temperature detector 18 are connected.

  The P-type signal line 12 is composed of a signal line and a common line, and is provided with a manual notification device of the fire hydrant device 20, a fire hydrant valve opening / closing detection switch, a pump activation switch, and a non-voltage a contact provided in each of the duct temperature detectors 18. When the switches are connected, the non-voltage a-contact switch is turned on by each operation or detection operation to flow the line current, so that a fire notification signal, a pump start signal, and a temperature detection signal are sent to the disaster prevention receiving panel 10. ing.

  As emergency facilities for the tunnel, in addition to the fire detector 16, the fire hydrant device 20, and the automatic valve device 22, a fire extinguishing pump device 24, a cooling pump device 25 for ducts, an IG substation device 26, a ventilation device 28, an alarm display. The board equipment 30, the radio rebroadcast equipment 32, the television monitoring equipment 34, the lighting equipment 36, etc. are provided. Except for connecting the IG slave station equipment 26 with a data transmission line, the other equipment is a P-type signal line. Reference numeral 12 denotes an individual connection to the disaster prevention receiver 10. Here, the IG slave station equipment 26 is a communication equipment that connects the disaster prevention receiver 10 and a remote monitoring and control equipment 27 that is a higher-order equipment provided outside via a network.

  The ventilation equipment 28 is an equipment that gives energy to the air in the tunnel by the high blowing wind speed by the operation of the jet fan installed on the ceiling side in the tunnel and causes a flow of ventilation in the longitudinal direction of the tunnel.

  Further, the alarm display panel equipment 30 is an equipment for displaying an abnormality in the tunnel to a user in the tunnel by displaying it on an electronic display panel. The radio rebroadcasting facility 32 is a facility for enabling a driver or the like to receive information from a road manager in a tunnel. The television monitoring facility 34 is a facility for confirming the scale and position of the fire, and for grasping the situation in the tunnel when the water spray facility is operated and evacuation guidance is performed. The lighting equipment 36 is equipment for driving and managing lighting equipment in the tunnel.

[Configuration of disaster prevention receiver]
FIG. 2 is a block diagram schematically showing a functional configuration of the tunnel disaster prevention system. As shown in FIG. 2, the disaster prevention receiver 10 includes a control unit 40. The control unit 40 is a function realized by, for example, executing a program. The hardware includes various input / output units including a CPU, a memory, and an AD conversion port. A computer circuit having an output port or the like is used.

  The control unit 40 is provided with a P-type transmission unit 42 in which various terminal devices installed in the tunnel are connected by the P-type signal line 12. Also, the control unit 40 has a speaker, a buzzer, an alarm indicator, and the like. , A display unit 46 having a liquid crystal display, etc., and an operation unit 48 having various switches. Further, a ventilation system 28, an alarm display panel system 30, a radio rebroadcasting system 32, and a television monitoring system 34 are provided. , A lighting device 36, a fire pumping device 24, and a cooling pumping device 25 are provided with a P-type transmission unit 52 which is individually connected by a P-type signal line 12.

  The control unit 40 includes a monitoring control unit 70 and a line current monitoring unit 72 as functions realized by executing the program. The monitoring control means 70 performs predetermined monitoring control based on detection signals and operation signals from terminal devices such as the fire detector 16 installed in the tunnel, the temperature detector 18 in the duct, the fire hydrant device 20 and the automatic valve device 22. .

For example, when receiving a fire notification signal by operating a manual notification device provided in the fire hydrant device 20, the monitoring control unit 70 performs a main sounding sound by the alarm unit 44 and displays a fire display and a manual notification section display on the display unit 46. Also, a response signal is transmitted to the fire hydrant device 20 to turn on the response lamp, and a pump start signal is output to the fire extinguishing pump equipment 24 to start the fire pump. Further, the monitoring control means 70 controls the other equipment by transmitting a fire notification signal to the remote monitoring control equipment 27 via the IG slave station equipment 26 to give an alarm, and by the TV monitoring equipment 34 to display a fire notification section. The control to display a fire report in the manual report section by the alarm display panel equipment 30, the control to ventilate the manual report section by the ventilation equipment 28, the control to illuminate the manual report section by the lighting equipment 36, and the like are performed.

  Further, when the temperature in the duct rises and the temperature detection signal is received from the temperature detector 18 in the duct, the monitoring control means 70 outputs a pump start signal to the cooling pump equipment 25 to spray water from the head installed in the duct. Control to cool the inside of the duct.

  The line current monitoring means 72 determines the current value of the signal line 12 connected to a terminal device equipped with a manual notification device, a fire hydrant valve open / close detection switch, a pump start switch, and a no-voltage a contact switch including a duct temperature detector 18. It is measured every cycle, for example, once a day, and stored in the memory. When the measured current value is equal to or more than a predetermined threshold value or exceeds a predetermined threshold value, it is determined that the current value is abnormal and an alarm is issued, and the current value is abnormal A signal is transmitted to a remote monitoring and control facility 27 which is an external higher-level facility via an IG slave station facility 26 so as to perform an alarm.

  The line current monitoring unit 72 determines the current value of the signal line 12 and issues an alarm. When the recovery signal from the operation unit 48 or the notification signal of the recovery operation by the remote monitoring control equipment is detected, A control for canceling the alarm due to the abnormality and restarting the current value measurement at predetermined intervals is performed. This control is the first embodiment of the line current monitoring control by the line current monitoring means 72 which will be described later.

[P-type transmission unit]
FIG. 3 is a block diagram showing details of a P-type transmission unit provided in the disaster prevention receiver. As shown in FIG. 3, the P-type transmission unit 42 is provided with a plurality of partition modules 60 corresponding to the partitions of the terminal devices installed in the tunnel. For example, a tunnel corresponding to the first partition module 60 is provided. In the section inside, a plurality of fire hydrant devices 20 and a plurality of duct temperature detectors 18 shown on the right side are arranged.

  The hydrant device 20 is provided with a manual notification device (transmitter) 54, a hydrant valve opening / closing detection switch 56, and a pump start switch 58 as terminal devices provided with a no-voltage a-contact switch.

  The compartment module 60 is provided with a line receiving unit 62a corresponding to the manual notification device 54, and provided with a line receiving unit 62b corresponding to the fire hydrant valve open / close detection switch 56 and the pump start switch 58. Correspondingly, a line receiving section 62c is provided.

  A plurality of manual notification devices 54 provided in a plurality of fire hydrant devices 20 are connected in parallel to the signal line 12a drawn from the line receiving unit 62a. For this reason, when the no-voltage a-contact switch is turned on by operating any one of the push buttons of the plurality of manual notification devices 54 belonging to the same section, the line current flows, and the line receiving section 62a receives the fire notification signal and specifies the section. The fire notification signal is output to the control unit 40.

  A plurality of fire hydrant valve open / close detection switches 56 and a pump start switch 58 provided in the plurality of fire hydrant devices 20 are connected in parallel to the signal line 12b drawn from the line receiving unit 62b. Here, the fire hydrant valve opening / closing detection switch 56 and the pump start switch 58 output a pump start signal based on an operation related to fire, and since they are common as pump start operating means, they are of the same type. Therefore, they are connected in parallel to the same signal line 12b as the same type of terminal device.

For this reason, when the user pulls out the hose with the nozzle of the fire hydrant device 20 and operates the fire hydrant valve opening / closing lever, the fire hydrant valve opening / closing detection switch 56 is turned on and the line current flows, so that the line receiving section 62b generates the pump start signal. The control unit 40 receives the pump start signal specifying the section and
Output to Also, when the fireman opens the door of the fire hydrant device 20, connects the fire hose to the water tap, and turns on the pump start switch 58, the line current flows and the line receiving unit 62b receives the pump start signal. Then, a pump start signal specifying the section is output to the control unit 40.

  Further, a duct temperature detector 18 provided in the same section is connected in parallel to the signal line 12c drawn from the line receiving section 62c. Therefore, when the detected temperature in the duct becomes equal to or higher than a predetermined threshold temperature by one of the plurality of duct temperature detectors 18 belonging to the same section, the no-voltage a contact switch is turned on, and the line current flows, The receiving unit 62c receives the temperature detection signal, and outputs a duct fire detection signal specifying the section to the control unit 40.

  Current measuring units 64a to 64c are provided for the line receiving units 62a to 62c provided in the partition module 60. The current measuring units 64a to 64c input a current value detection signal, which detects a current value flowing through each of the signal lines 12a to 12c, to the selector unit 65. The selector unit 65 receives a control signal at a predetermined measurement timing that is once a day by the line current monitoring means 72 provided in the control unit 40 of FIG. The current value detection signal is sequentially selected and output to the AD conversion port of the control unit 40, and the line current monitoring means 72 converts the analog current value input to the AD conversion port into a digital current value, reads the digital current value, and stores it in the memory. The current value of each signal line is periodically measured and recorded.

  FIG. 4 is a circuit block diagram showing details of the current measuring unit provided in the P-type transmission unit of FIG. 3, and shows one signal line as an example. As shown in FIG. 4, a non-voltage a contact switch 68 and a terminating resistor 15 provided in the terminal device 14 are connected in parallel to a signal line 12 including a signal line L and a common line C drawn from the disaster prevention receiver 10. In the normal monitoring state, the no-voltage a-contact switch 68 is off as shown in the figure.

  The signal line L of the signal line 12 is connected to a power supply line of the power supply voltage + Vc by a resistor 66, and the common line C is grounded. For this reason, in the steady monitoring state in which the no-voltage a contact switch 68 of the terminal device 14 is off, the line voltage VL between the signal line L of the signal line 12 and the common line C is the power supply voltage + Vc. The voltage VL is input to the line receiving unit 62.

  When any of the no-voltage a-contact switches 68 of the terminal devices 14 connected to the signal line 12 is turned on, the line voltage VL between the signal line L and the common line C decreases to substantially zero volt. The line receiving unit 62 includes a switching circuit that is turned on when the line voltage VL drops to around zero volt, and outputs a received signal to the control unit 40 when the switching circuit is turned on.

  The current measuring unit 64 is a circuit that detects the line voltage VL between the signal line L and the common line C pulled up to the power supply line by the resistor 66 as a current detection signal VL. Assuming that the value is Rs and the insulation resistance of the signal line 12 is Z, the current I flowing through the signal line 12 when the no-voltage a contact switch 68 is off is expressed by the following equation.

Here, ( _RS // Z) is the parallel resistance value.

Represents Therefore, the current detection signal (line voltage) VL is

And a current detection signal (line voltage) VL that increases in proportion to the line current I is obtained.

  When the insulation deterioration of the signal line 12 occurs, the insulation resistance Z decreases, thereby increasing the current I flowing through the signal line 12 and increasing the current detection signal (line voltage) VL.

The line voltage (current detection signal) VL detected by the current measuring unit 64 is input to the selector unit 65, and is sequentially read out from the selector unit 65 together with another current detection signal at a predetermined measurement timing, and is read from the AD conversion port. The line current monitoring means 72 of the control unit 40
I = (Vc−VL) / R (Equation 3)
The current value I is obtained and recorded, and compared with a predetermined threshold value, it is determined that the current value is abnormal due to deterioration of the insulation of the signal line, and an alarm is issued.

  As another embodiment of the current measuring unit 64, a current detecting resistor is inserted and connected to the signal line L side following the pull-up connection point by the resistor 66, and a current detecting voltage generated at both ends of the current detecting resistor in proportion to the current. Is input to the selector unit 65, and sequentially read out from the selector unit 65 together with another current detection signal at a predetermined measurement timing, and read and recorded as a current detection value from the AD conversion port by the line current monitoring unit 72 of the control unit 40. Alternatively, a warning may be made by comparing with a predetermined threshold value and determining an abnormal current value due to insulation deterioration of the signal line.

[First Embodiment of Line Current Monitoring and Control]
FIG. 5 is a flowchart showing a first embodiment of the line current monitoring control for canceling the alarm of the current value abnormality by a recovery operation. As described above, the first embodiment of the line current monitoring control by the line current monitoring means 72 provided in the control unit 40 shown in FIG. 27, an alarm is issued. When a recovery operation by the disaster prevention receiver 10 or the remote monitoring and control equipment 27 is detected during the alarm, the alarm state due to the abnormal current value is released and the current value measurement is restarted at predetermined intervals. It is characterized by doing so.

   As shown in FIG. 5, when the line current monitoring means 72 determines in step S1 that the line current measurement timing reaches a predetermined time, for example, once a day, the flow proceeds to step S2, where the line number N is set to N = 1. Then, in step S3, the current value of the first signal line determined by N = 1 under the control of the selector unit 65 shown in FIG. 3 is measured and recorded in the memory.

  Subsequently, it is determined whether or not the current value measured in step S4 is equal to or greater than a predetermined threshold (or whether or not the current value is greater than the threshold). If it is determined that the current value is equal to or greater than the predetermined threshold, the process proceeds to step S5. It is determined that the current value is abnormal due to the deterioration of the insulation of the signal line, an audible alarm is issued by the alarm unit 44 of the disaster prevention receiver 10, and an alarm is displayed by the display unit 46. The current value abnormality signal is transmitted to the remote monitoring and control equipment 27 to warn the user. If the current value is less than the threshold value in step S4, the processing in steps S5 to S7 is skipped.

  Subsequently, until the line number N reaches the maximum value Nmax, the line number N is incremented by one in step S9, and the processing from step S3 is repeated. When the measurement recording of the current values of all the signal lines and the determination of the current value abnormality are completed, the process proceeds to step S10, and it is determined whether or not the current value abnormality is currently being warned. If it is determined that the current value is being warned, the process proceeds to step S11. It is determined whether there is a direct error recovery operation by the disaster prevention receiver 10 or a remote error recovery operation by the remote monitoring control equipment 27.

  If it is determined in step S11 that the abnormality recovery operation has been performed directly or remotely, the process proceeds to step S12, in which the alarm of the current value abnormality is restored to release the alarm state, and the process returns to step S1 to wait for the next line current measurement timing.

  According to the first embodiment of such line current monitoring control, even if a current value abnormality occurs once and an alarm is issued, a recovery operation is performed by the disaster prevention receiver 10 or the remote monitoring control device 27. The alarm state is released, the current value can be measured and recorded continuously, and the tendency of insulation deterioration of the signal line can be determined from the change in the recorded current value so that appropriate measures can be taken.

[Second embodiment of line current monitoring control]
FIG. 6 is a flowchart showing a second embodiment of the line current monitoring control for canceling the current value alarm by changing the threshold value. In the second embodiment of the line current monitoring control by the line current monitoring means 72 of FIG. 2, a threshold value for judging a current value abnormality is set for each line, and when the current value is judged to be abnormal, the current value is not judged to be abnormal. The threshold value is changed as described above.

  As shown in FIG. 6, the processing in steps S21 to S32 by the line current monitoring means 72 is the same as the processing in steps S1 to S12 in FIG.

  If the line current monitoring means 72 determines in step S31 that the abnormality has been restored directly or remotely, the process proceeds to step S32, in which the alarm of the abnormal current value is restored and the alarm state is released, and then the process proceeds to step S33, where the abnormal current value is detected. The threshold set for the signal line determined to be is read out and displayed on the display unit 46. If the threshold change operation by the operation unit 48 is determined in step S34, the current threshold is changed so as not to be determined as abnormal current value in step S35. I do.

  Changing this threshold changes the current threshold to a larger threshold. This change to increase the threshold may be performed by adding a predetermined threshold increase value to the current threshold or by multiplying the current threshold by one or more predetermined coefficients. However, the upper limit is determined for the increase in the threshold, and no further increase is performed.

Subsequently, the process from step S33 is repeated until the process of changing the threshold value is performed for all the signal lines having abnormal current values in step S36, and when this is completed, the process returns to step S21 to wait for the next line current measurement timing.

  According to the second embodiment of such line current monitoring control, even if a current value abnormality occurs once and an alarm is issued, for example, the threshold value is changed to a higher value so as not to determine the current value abnormality. By doing so, the alarm of the current value abnormality is not issued until the current value abnormality is determined by the changed threshold value, and the current value can be continuously measured and recorded without bothering with the current value abnormality alarm. It is possible to judge the tendency of insulation deterioration in the signal line from the change in the recorded current value and to take appropriate measures.

[Third Embodiment of Line Current Monitoring and Control]
FIG. 7 is a flowchart showing a third embodiment of the line current monitoring control for masking the current value measurement of a line having an abnormal current value. In the third embodiment of the line current monitoring control by the line current monitoring means 72 in FIG. 2, when an abnormality in the current value is determined in any of the plurality of signal lines, the measurement of the current value of the signal line determined to be abnormal is performed. It is characterized in that mask processing for suppressing is performed.

  As shown in FIG. 7, the processing of steps S41, S42 and S44 to S53 by the line current monitoring means 72 is the same as the processing of steps S1 to S12 in FIG. 5, and the processing of step S43 is newly added.

  In step S43, the line current monitoring means 72 determines whether or not the signal line has been determined to have an abnormal current value in the previous processing. If the signal line has not been determined to have an abnormal current value, the process proceeds to steps S44 to S48. By processing, the current value of the signal line is measured and recorded, and the measured current value is compared with a threshold to determine the presence or absence of a current value abnormality. If the current value is determined to be abnormal, the disaster prevention receiver 10 and the remote monitoring control The equipment 27 outputs an alarm for abnormal current value.

  On the other hand, if it is determined in step S43 that the signal line for which the current value abnormality has been determined is determined, the processing in steps S44 to S48 is skipped, and the current value for the signal line is not measured and recorded. The signal line is subjected to a mask process for excluding the signal line from monitoring targets.

  According to the third embodiment of such line current monitoring control, by excluding a signal line determined to have an abnormal current value from a measurement target, even if insulation deterioration occurs in a specific signal line, other signal lines are not affected. The measurement record of the current value can be continued.

[Fourth Embodiment of Line Current Monitoring and Control]
FIG. 8 is a flowchart showing a fourth embodiment of the line current monitoring control for determining a current value abnormality based on a threshold value according to environmental conditions. The fourth embodiment of the line current monitoring control by the line current monitoring means 72 in FIG. 2 measures a predetermined environmental condition, for example, temperature and humidity, together with the current value of the signal line, and determines an abnormal current value according to the temperature and humidity. The threshold value is changed.

  The change of the threshold value according to the environmental condition by the line current monitoring means 72 is performed, for example, by setting a predetermined reference threshold value in advance, and changing the reference threshold value to a higher threshold value when it is determined that the temperature and the humidity are high and high humidity. If the low-temperature drying is determined from the humidity and the humidity, the reference threshold is changed to a lower threshold.

  As shown in FIG. 8, when the line current monitoring unit 72 determines in step S61 that the predetermined line current measurement timing has been reached, the process proceeds to step S62, in which the line current monitoring unit 72 measures the temperature with the temperature detector installed in the tunnel, and adjusts the humidity. Measure the humidity with a detector and capture it.

Subsequently, the process proceeds to step S63, and the threshold value for judging the current value abnormality is changed according to the temperature and humidity measured and taken in step S62. This change in the threshold value is performed because the insulation deterioration of the signal line 12 is likely to occur under the environmental conditions of high temperature and high humidity in the summer, so that the reference threshold value is changed to a higher threshold value, and the temporary insulation caused by the environmental condition is changed. It is possible to determine that the current value is abnormal due to deterioration and not to issue an alarm.

  Subsequently, the processes of steps S64 to S74 are performed, but since this process is the same as steps S2 to S12 of FIG. 5, the description thereof will be omitted.

  As a modified example of the fourth embodiment of the line current monitoring control for changing the threshold value according to the environmental condition, the line current monitoring means 72 detects the abnormal current value based on the environmental condition and the temporal measurement result of the current value. May be changed over time.

  In this case, the line current monitoring unit 72 artificially checks a log that is a measurement result of the temperature or humidity and the current value, for example, from June to September when the current value tends to increase due to high temperature and high humidity, for example. Changes the reference threshold to a higher threshold, and changes the reference threshold to a higher threshold during the time of day when the temperature becomes higher, for example, from 10:00 to 18:00, and thus changes the time of the environmental condition. By changing the threshold value in accordance with a specific change, it is possible to avoid the determination of the abnormal current value and to suppress unnecessary alarm output.

  Here, the change of the threshold value corresponding to the temporal change of the environmental condition is performed by automatically storing a threshold value that temporally changes in accordance with the season or the time zone of the day, so that the threshold value is automatically changed according to the passage of time. The threshold value may be changed and set, or the threshold value may be temporally changed by a manual operation.

[Fifth Embodiment of Line Current Monitoring and Control]
FIG. 9 is a flowchart showing a fifth embodiment of the line current monitoring control for notifying the host equipment when the current value abnormality exceeds a predetermined number. In the fifth embodiment of the line current monitoring control by the line current monitoring means 72 in FIG. 2, when the abnormal current value of the signal line is determined continuously for a predetermined number of times, a current value abnormal signal is transmitted to the higher-level equipment to make an alarm. It is characterized by the following.

  As shown in FIG. 9, the processing in steps S81 to S87 by the line current monitoring means 72 is the same as the processing in steps S1 to S6 in FIG.

  When the measurement and recording of the current values of all the signal lines and the determination of the current value abnormality are performed by the processing of S81 to S87 and the process proceeds to step S89, it is determined whether the determination of the current value abnormality has been continued for the same signal line for a predetermined number of times or more. If the number of continuations is less than the predetermined number of times, step S90 is skipped and the current value abnormality signal is not transmitted to the remote monitoring control equipment 27, and it is determined in step S89 that the current value abnormality has continued for the predetermined number of times or more. If it is determined, the process proceeds to step S90, and at this stage, the remote monitoring and control equipment 27 is notified by sending a current value abnormality signal to give an alarm.

  Subsequent processes in steps S91 to S93 are the same as steps S10 to S12 in FIG.

  According to the fifth embodiment of such line current monitoring control, even if insulation degradation of a signal line temporarily occurs due to a change in environmental conditions or the like, it is determined that the current value is abnormal unless insulation degradation continues. The current value abnormality signal is not transmitted to the remote monitoring control equipment 27 and the like, and it is possible to suppress unnecessary alarms for the current value abnormality due to the transient factor.

[Sixth Embodiment of Line Current Monitoring and Control]
FIG. 10 is a flowchart showing a sixth embodiment of the line current monitoring control for notifying the host equipment when the current value abnormality exceeds a predetermined number. The sixth embodiment of the line current monitoring control by the line current monitoring means 72 in FIG. 2 is characterized in that when it is determined that the current value is abnormal, the measurement period is shortened and the current value is measured and recorded.

  As shown in FIG. 10, when the line current monitoring means 72 determines in step S101 that the line current measurement has reached the first timing, for example, once a day at a predetermined time, the line number N is changed to N = N in step S102. The process is initially set to 1, and the processes of steps S103 to S109 are performed. However, since this process is the same as the processes of steps S3 to S9 in FIG.

  Subsequently, based on the current value measurement of the signal line 12 and the determination result of the abnormal current value, if there is a signal line having an abnormal current value in step S110, the line current monitoring unit 72 proceeds to step S111. It is determined whether or not the first measurement timing is once a day. If not, the process proceeds to step S112, and it is determined whether or not the second measurement timing is shorter than the period of the first measurement timing, for example, once every hour. When it is determined that the measurement timing has been reached, the process proceeds to step S113, in which the current value of the signal line for which the current value abnormality is determined is measured and recorded, and in step S114, the measurement of all the signal lines for which the current value abnormality is determined is completed. The process of step S113 is repeated until.

  Subsequently, the processing of steps S115 and S116 is performed, but since this is the same as steps S11 and S12 in FIG. 5, the description is omitted.

  According to the sixth embodiment of such a line current monitoring control, for example, when it is determined that the current value is abnormal in the current value measurement once a day at predetermined intervals, the current value is changed to a second period shorter than that. It is possible to measure and record the current value of a signal line for which a current value abnormality has been determined at short time intervals, and to more accurately grasp the change in the current value due to insulation deterioration and to deal with it.

[Seventh embodiment of line current monitoring control]
FIG. 11 is a flowchart showing a seventh embodiment of the line current monitoring control in which a higher-level facility is notified and warned for a predetermined time when it is determined that the current value is abnormal. In the seventh embodiment of the line current monitoring control by the line current monitoring means 72 of FIG. 11, when it is determined that the current value of the signal line is abnormal, a current value abnormal signal including the signal line information is transmitted to the remote monitoring control equipment 27. Then, when a predetermined time has passed, the transmission of the current value abnormality signal is stopped, and the warning of the current value abnormality in the remote monitoring control equipment 27 is released.

  As shown in FIG. 11, the processing of steps S121 to S126 by the line current monitoring means 72 is basically the same as the processing of steps S1 to S6 of FIG. 5, but the steps of FIG. 11 corresponding to step S6 of FIG. In the process of S126, the current value abnormality is alarmed by the disaster prevention receiver 10. However, at this stage, the current value abnormality signal is not transmitted to the remote monitoring control equipment 27 and the current value abnormality alarm is not performed. Different.

  The remote monitoring and control equipment 27 proceeds to step S129 after the processing of steps S121 to S128 is completed, and if there is a signal line with an abnormal current value, the remote monitoring and control equipment 27 sends the current value abnormal signal including the line information to the remote monitoring and control equipment 27 in step S130. Is transmitted, and the remote monitoring control equipment 27 outputs an alarm for an abnormal current value including the line information.

  Subsequently, if it is determined in step S131 that the remote monitoring and control equipment 27 has passed a predetermined time which can respond to the alarm of the current value abnormality, the process proceeds to step S132, and the transmission of the current value abnormal signal to the remote monitoring and control equipment 27 is stopped. , Release the alarm output.

  Subsequently, the processing of steps S133 and S134 is performed, but since this is the same as steps S11 and S12 in FIG. 5, the description is omitted.

  According to the seventh embodiment of such line current monitoring control, even if the disaster prevention receiver 10 determines that the signal line has an abnormal current value and outputs an alarm, for example, the remote monitoring and control equipment 27 serving as an external higher-level equipment In this case, only the alarm of the abnormal current value is output only during the predetermined time, and the alarming condition of the abnormal current value continues to interfere with the management work in the remote monitoring and control equipment 27 that centrally monitors a plurality of tunnels. Can be avoided.

[Modification of the present invention]
(Terminal equipment)
In the above embodiment, as a terminal device connected to a signal line for measuring and monitoring a current value due to insulation deterioration, a manual notification device, a hydrant valve opening / closing detection switch, a pump activation switch, and a temperature detector in the duct are taken as an example. As long as the terminal device connects the non-voltage a contact switch to the signal line from the disaster prevention receiver, other appropriate terminal devices are included.

(Disconnection monitoring of signal line)
Further, in the above embodiment, when the measured current value of the signal line exceeds a predetermined threshold value or exceeds an upper limit threshold value due to insulation deterioration, it is determined that the current value is abnormal, but the current value flows to the signal line in a normal monitoring state. It is also possible to set a predetermined lower threshold value lower than the current consumption, and determine that the current value is abnormal when the measured current value is equal to or lower than the lower threshold value or lower than the lower threshold value, and issue an alarm. In this manner, an abnormal current value such as being equal to or less than the lower threshold value is detected and alarmed by detecting a disconnection failure of the signal line.

(Other)
Further, the present invention includes appropriate modifications that do not impair the objects and advantages thereof, and is not limited by the numerical values shown in the above embodiments.

1a: Up line tunnel 1b: Down line tunnel 10: Disaster prevention receiver 12: Signal line 14: Terminal equipment 16: Fire detector 18: Duct temperature detector 20: Fire hydrant device 22: Automatic valve device 24: Fire extinguishing pump equipment 25 : Cooling pump equipment 26: IG slave station equipment 27: Remote monitoring control equipment 28: Ventilation equipment 30: Alarm display board equipment 32: Radio rebroadcast equipment 34: Television monitoring equipment 36: Lighting equipment 40: Control units 42, 52: P Type transmission unit 44: Alarm unit 46: Display unit 48: Operation unit 54: Manual notification device 56: Fire hydrant valve open / close detection switch 58: Pump start switch 60: Partition module 62: Line reception unit 64: Current measurement unit 65: Selector unit 68: no-voltage a contact switch 70: monitoring control means 72: line current monitoring means

Claims (16)

In a tunnel disaster prevention system that connects terminal equipment to the signal line drawn into the tunnel from the disaster prevention receiver and monitors it,
A current value flowing through the signal line is measured, and when the measured current value is equal to or greater than a predetermined threshold value or exceeds the predetermined threshold value, it is determined that the current value is abnormal, and a current value abnormality signal is transmitted to external equipment. A tunnel disaster prevention system comprising a line current monitoring means for giving an alarm when a warning is issued.
2. The tunnel disaster prevention system according to claim 1, wherein the line current monitoring means interrupts the measurement of the current value when it is determined that the current value is abnormal.
3. The tunnel disaster prevention system according to claim 1, wherein the line current monitoring means records a measured current value flowing through the signal line.
3. The tunnel disaster prevention system according to claim 1, wherein the line current monitoring unit cancels the alarm of the abnormal current value when a predetermined recovery operation by the disaster prevention receiver or the external equipment is detected. Tunnel disaster prevention system.
5. The tunnel disaster prevention system according to claim 3, wherein the line current monitoring unit measures a current value flowing through the signal line when detecting a predetermined restoration operation by the disaster prevention receiver or the external equipment. Tunnel disaster prevention system characterized by restarting.
The tunnel disaster prevention system according to any one of claims 1 to 5, wherein the line current monitoring unit sets a threshold value for determining an abnormal current value for each signal line, and determines that the current value is abnormal. And changing the predetermined threshold value so that it is difficult to determine that the current value is abnormal as compared to before the change.
6. The tunnel disaster prevention system according to claim 1, wherein the line current monitoring unit determines that the current value is abnormal when any of the plurality of signal lines determines that the current value is abnormal. A tunnel disaster prevention system characterized by excluding from the current value measurement target.
6. The tunnel disaster prevention system according to claim 1, wherein the line current monitoring unit measures a predetermined environmental condition together with a current value of the signal line, and measures the measured current value of the signal line and the current value of the signal line. A disaster prevention system for a tunnel, wherein the abnormal current value is determined according to an environmental condition.
9. The tunnel disaster prevention system according to claim 8, wherein said line current monitoring means changes said predetermined threshold value for judging said current value abnormality based on a measurement result of said predetermined environmental condition. Disaster prevention system.
10. The tunnel disaster prevention system according to claim 9, wherein the line current monitoring unit changes the predetermined threshold value for determining that the current value is abnormal for a predetermined period based on a measurement result of the predetermined environmental condition. Tunnel disaster prevention system.
11. The tunnel disaster prevention system according to claim 10, wherein the line current monitoring unit is configured to determine the current value to be abnormal based on a measurement result of the predetermined environmental condition during a season or a day. A tunnel disaster prevention system, which changes according to the season or the time of day.
12. The tunnel disaster prevention system according to claim 9, wherein the line current monitoring unit sets the predetermined threshold value as a predetermined reference threshold value in advance, and determines that the temperature is high and high from the measurement result of the predetermined environmental condition. Wherein the reference threshold is changed to a higher threshold, and when it is determined that the temperature is low-temperature drying from the measurement result of the predetermined environmental condition, the reference threshold is changed to a lower threshold.
6. The tunnel disaster prevention system according to claim 1, wherein the line current monitoring unit determines that the current value is abnormal for a predetermined number of times with respect to the same signal line and the external equipment. 7. Wherein the current value abnormal signal is transmitted to cause an alarm.
6. The tunnel disaster prevention system according to claim 1, wherein the line current monitoring means measures a current value of the signal line at predetermined intervals, and measures a current value of the signal line at predetermined intervals. When the current value is determined to be abnormal in the measurement, the current value of the signal line is measured for each of the signal lines determined to have the abnormal current value for each cycle shorter than the predetermined cycle. .
In the tunnel disaster prevention system according to any one of claims 1 to 5, when the line current monitoring unit determines that the current value is abnormal, the line current monitoring unit transmits the current value abnormal signal to the external facility to issue an alarm. And after that, when a predetermined time has elapsed, the warning is released.
16. The tunnel disaster prevention system according to claim 1, wherein the line current monitoring unit sets the predetermined threshold to a predetermined lower threshold lower than a current value normally flowing through the signal line. When the current value measured by the monitoring means is equal to or less than the lower threshold value or lower than the lower threshold value, it is determined that the current value is abnormal.

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