JP6949175B2 - Tunnel disaster prevention system - Google Patents

Description

The present invention relates to a tunnel disaster prevention system that monitors a fire by connecting a fire detector installed in the tunnel to a disaster prevention monitoring panel.

Conventionally, emergency facilities have been installed in tunnels such as motorways to protect people and vehicles from fire accidents that occur in the tunnels.

Such emergency facilities include a fire detector, a manual notification device, and an emergency telephone for fire monitoring and notification, a fire hydrant device for extinguishing a fire and preventing the spread of fire, and a tunnel frame. In order to protect from fire, water spray equipment that sprinkles fire extinguishing water from the water spray head to lower the temperature inside the tunnel is installed, and by installing a disaster prevention receiver that monitors and controls the terminal equipment of these emergency facilities, We are building a tunnel disaster prevention system.

The tunnel disaster prevention system consisting of the disaster prevention receiver and the terminal equipment is roughly classified into the R type transmission system and the P type direct delivery system. The R-type transmission method connects a fire detector with an address set to a signal line, and enables individual management in which detection is performed for each fire detector by transmission control.

In the P-type direct delivery system, the fire detectors are divided into predetermined automatic notification section units, and a plurality of fire detectors belonging to the same section are connected to the signal line drawn from the disaster prevention receiver to each section for monitoring. In the fire judgment by the P-type direct delivery type disaster prevention receiver, when the fire detector detects a fire, a fire pulse signal is output at a predetermined time interval, so that the first pulse is processed as a fire warning signal. Subsequently, the disaster prevention receiving panel temporarily restores the fire receiving circuit when a predetermined time has passed from the reception of the first pulse, and if the fire pulse signal is received again from the fire detector within the predetermined time after the restoration, the fire is judged as a fire. On the other hand, if the fire pulse signal is not received again within the specified time after restoration, it is treated as non-fire.

Japanese Unexamined Patent Publication No. 2002-246962 Japanese Unexamined Patent Publication No. 11-128381 Japanese Unexamined Patent Publication No. 2006-99394

However, in such a conventional P-type direct delivery type tunnel disaster prevention system, the fire detector is monitored for each automatic notification section, so that the disaster prevention receiver installed in the tunnel with a large number of automatic notification sections has a section. There is a problem that a hardware configuration such as a receiving circuit according to the number is required, the size of the housing of the disaster prevention receiving panel becomes large, and the cost also becomes high.

For example, in the case of a 2400-meter tunnel, if the monitoring area of the fire detector is within a range of 25 meters on both sides, 96 fire detectors are required, and the automatic notification section is set to include two fire detectors each. Therefore, 48 sections are required, and the receiving circuit of the disaster prevention receiving board is required for 48 inputs correspondingly, the housing size of the disaster prevention receiving board becomes large, and the cost also becomes high.

In addition, the signal line between the disaster prevention receiver and the fire detector is also wired according to the number of automatic notification sections, and the amount of wiring installed between the disaster prevention receiver and the fire detector increases according to the number of sections. However, there is also a problem that the equipment construction is difficult and the equipment cost becomes expensive.

An object of the present invention is to provide a tunnel disaster prevention system that enables cost reduction without increasing the housing size and wiring amount of the disaster prevention receiver even when the number of automatic notification sections increases.

(Tunnel disaster prevention system)
The present invention is a tunnel disaster prevention system in which a plurality of fire detectors arranged in a tunnel are sequentially connected by a signal line including a plurality of signal lines, and one end of the signal line is connected to a disaster prevention receiver to monitor a fire. And
The fire detector carries out a predetermined test on its own machine based on a test start signal including a predetermined address received from the primary side which is the disaster prevention receiving panel side of the predetermined signal line, and uses the address as its own address. In addition, the test start signal including the changed address included in the received test start signal is transmitted to the secondary side of the predetermined signal line, and when a fire is detected , the address of the own machine is attached. It is characterized in that the fire detection signal is transmitted to the disaster prevention receiving panel by another signal line.

(Basic effect)
The present invention is a tunnel disaster prevention system in which a plurality of fire detectors arranged in a tunnel are arranged to monitor a fire, and the fire detector starts a test from the primary side which is the disaster prevention receiving panel side of a signal line. A fire detection signal with the address of the own machine is transmitted to the disaster prevention receiver when a fire is detected by conducting a predetermined test on the own machine based on the signal and setting the address of the own machine. , Send a test start signal with the address to be set to the fire detector connected to the signal line, set the address together with the detector test, and communicate only to set the address for each fire detector Since there is no need to perform control, it is possible to reduce the control burden on the disaster prevention receiver side due to address setting and to easily and surely automatically set the address on the fire detector.

In addition, when a fire is detected during operation, it is transmitted as a fire detection signal with the address set by the test, so it can be received by pre-registering the correspondence between the address and the section on the disaster prevention receiver. It is possible to identify and notify the automatic notification section that detected a fire from the address of the fire detection signal, and even with the P-type direct delivery method, it is possible to save the trouble of checking the fire detector that detected the fire on site as in the past. ..

Block diagram showing the outline of the functional configuration of the tunnel disaster prevention system Explanatory drawing showing signal line connection by signal line to fire detector Block diagram showing the functional configuration of the fire detector Explanatory drawing showing the test start signal which combined the test start pulse and the address pulse used in the detector test. Time chart showing the signal waveform of each signal line in the fire detector test Explanatory diagram showing management information showing the correspondence between the address of the fire detector registered in the disaster prevention receiver and the section Flow chart showing the control operation of the fire detector

[Overview of tunnel disaster prevention system]
FIG. 1 is a block diagram showing an outline of the functional configuration of the tunnel disaster prevention system. As shown in FIG. 1, a disaster prevention receiver 10 is installed in a monitoring center or the like in order to monitor an abnormality in the tunnel.

As the tunnel of the motorway, an up line tunnel and a down line tunnel are constructed, and fire detectors 14 are installed inside the tunnel at intervals of 25 meters, for example, along the wall surface in the longitudinal direction of the tunnel. The fire detector 14 sets monitoring areas on both sides, which are 25 meters to the left and right, detects a flame caused by a fire, and transmits a fire detection signal to the disaster prevention receiving panel 10. The fire detectors 14 installed in the tunnel at intervals of 25 meters form an automatic notification section by two adjacent fire detectors 14.

In the disaster prevention receiver 10 of the present embodiment, assuming that the sections of the fire detectors 14 installed in the tunnel are D1 to Dm, for example, eight fire detectors 14 included in the four sections are grouped as one group. It is divided into G1 to Gn, and a signal line 12 is pulled out from the disaster prevention receiving panel 10 for each of the divided groups G1 to Gn, and eight fire detectors 14 belonging to each group G1 to Gn are connected.

Therefore, the number of receiving circuit units 18 provided in the disaster prevention receiving panel 10 need only be provided corresponding to the number of groups G1 to Gn, and the number of receiving circuit units 18 is larger than that in the case where the receiving circuit units are provided in each section. This makes it possible to reduce the size of the housing of the disaster prevention receiver 10 and reduce the amount of wiring of the signal line 12 and reduce the equipment cost.

For example, in the case of a tunnel of 2400 meters, 96 fire detectors 14 are installed at intervals of 25 meters, and the number of sections of the automatic notification section is 48 because it is a unit of 2 fire detectors. In this case, if the receiving circuit unit 18 is provided in the conventional section unit, 48 units are required, but in the present embodiment, for example, eight fire detectors 14 are grouped and connected to the signal line 12. Therefore, the number of receiving circuit units 18 can be reduced to 12.

The number of fire detectors 14 connected to the same signal line 12 by group division is not limited to the eight shown in the figure, and the maximum address automatically set for the fire detector 14 to be clarified later through the detector test. Within the range of, it is possible to group eight or more units and further reduce the number of receiving circuit units 18.

The disaster prevention receiver 10 includes a control unit 16, and the control unit 16 is a function realized by executing a program, for example. As hardware, a computer circuit having a CPU, a memory, various input / output ports, and the like is used. ..

The control unit 16 is provided with a receiving circuit unit 18 corresponding to the signal line 12 drawn out for each group G1 to Gn including eight fire detectors 14, and the control unit 16 is provided with a speaker, a buzzer, and the like. An alarm unit 20 equipped with an alarm indicator light and the like, a display unit 22 equipped with a liquid crystal display and the like, an operation unit 24 equipped with various switches, a modem 26 for connecting IG slave station equipment, and a ventilation equipment and an alarm display board are provided. A P-type transmission unit 28 is provided in which equipment, radio rebroadcasting equipment, television monitoring equipment, lighting equipment, and fire extinguishing pump equipment are individually connected by a P-type signal line. The IG slave station equipment connected by the modem 26 is a communication equipment that connects the disaster prevention receiver 10 and other equipment with the remote management equipment.

The control unit 16 of the disaster prevention receiver 10 automatically assigns addresses unique to the eight fire detectors 14 connected to each of the 12 signal lines by performing a detector test for each signal line 12 after the system is installed. Control to set.

Further, when the control unit 16 of the disaster prevention receiver 10 receives a fire detection signal including the address set by the detector test from the fire detector 14 during monitoring after the address setting by the detector test is completed, the control unit 16 receives the fire detection signal from the fire detector 14. Based on the address included in the received fire detection signal, control is performed to determine and notify the section where the fire was detected.

The detector test by the control unit 16 of the disaster prevention receiver 10 involves control of transmitting a test start signal including a predetermined start address, for example, address A = 1, to the signal line 12 when the detector test operation is detected. Detector test control of. Each fire detector 14 connected to the signal line 12 starts a predetermined test operation when the test start signal is received from the primary side, which is the disaster prevention receiver 10 side, for the detector test control of the disaster prevention receiver 10. At the same time, the address A included in the received test start signal is taken out and stored, and when the test is completed, the received address A is incremented by one and the test start signal including the address A + 1 is connected to the secondary side. Control to transmit to the next fire detector 14, eight fire detectors 14 autonomously send test start signals in order while increasing the address A by one, and automatically set a unique address.

[Fire detector configuration]
FIG. 2 is an explanatory diagram showing a signal line connection by a signal line to the fire detector, and FIG. 3 is a block diagram showing a functional configuration of the fire detector.

(Connection between fire detector and signal line)
As shown in FIG. 2, the signal line 12 drawn from the disaster prevention receiver 10 includes a power supply line 34, a common line 36, a fire signal line 38, a signal line 40 under test, test power supply lines 42 and 44, and a test start signal line. 46a is included.

FIG. 2 shows the connection between the first fire detector 14-1 near the disaster prevention receiver 12 side and the next fire detector 14-2 taken out and connected to the signal line 12, and the fire detectors 14-1 and 14 -2 is connected in parallel to the power supply line 34, the common line 36, the fire signal line 38, the test signal line 40, and the test power supply lines 42 and 44, but the test start signal line 46a from the disaster prevention receiving panel 10 Is input-connected to the fire detector 14-1, and the test start signal line 46b is output-connected to the fire detector 14-1 on the primary side and input-connected to the fire detector 14-2 on the secondary side. ing. That is, the fire detectors 14-1 and 14-2 are connected in series to the disaster prevention receiver 10 by the test start signal lines 46a and 46b.

The fire detectors 14-1 and 14-2 are provided with a left eye light receiving part 30a and a right eye light receiving part 30b side by side, and a range of 25 meters to the left and right is set as a monitoring area, and a fire detection signal is detected by detecting a flame caused by a fire. Is transmitted to the disaster prevention receiver 10. If it is not necessary to distinguish between the fire detectors 14-1 and 14-2 in the following description, the fire detector 14 is used.

(Fire detector configuration)
As shown in FIG. 3, the fire detector 14-1 includes a control unit 50, and the control unit 50 is a function realized by executing a program, for example, and the hardware includes a CPU, a memory, various input / output ports, and the like. Use a computer circuit or the like equipped with.

The control unit 50 is provided with a left-eye fire detection unit 48a, a right-eye fire detection unit 48b, a test transmission unit 52, and a fire transmission unit 54. The test transmission signal line 40 and the test power supply lines 42 and 44 are connected in parallel to the test transmission unit 52, the test start signal line 46a on the primary side is input and connected, and the test start signal line 46b on the secondary side is connected. The output is connected.

The left-eye fire detection unit 48a and the right-eye fire detection unit 48b monitor a fire by, for example, a two-wavelength flame detection. That is, the left eye fire detection unit 48a and the right eye fire detection unit 48b selectively transmit the radiant energy of 4.4 to 4.5 μm, which is the resonance radiation band of CO2 peculiar to the flame, by the narrow band optical wavelength bandpass filter. After (passing), the radiation energy is detected by the light receiving sensor and photoelectrically converted, and then subjected to predetermined processing such as amplification to process the light receiving signal corresponding to the amount of energy, and the relative ratio of the light receiving signal level is taken. The presence or absence of flame is determined by comparing with a predetermined threshold.

When the control unit 50 of the fire detector 14-1 detects a fire based on the determination by the left eye fire detection unit 48a or the right eye fire detection unit 48b that there is a fire, the control unit 50 instructs the fire transmission unit 54 for a predetermined time. Control is performed to periodically transmit a fire detection signal, which is a combination of a fire pulse having a predetermined pulse width and an address pulse indicating a self-address, to the fire signal line 38 at intervals.

Further, the control unit 50 of the fire detector 14-1 has the repolarization voltage output to the test power supply lines 42 and 44 and the address A = output to the test start signal line 46a in accordance with the detector test of the disaster prevention receiver panel 10. When the test start signal including 1 is received via the test transmission unit 52, the right eye fire detection unit 48b and the left eye fire detection unit 48a are controlled to perform a predetermined test operation and transmit the fire detection signal by the test. conduct.

Further, when the control unit 50 of the fire detector 14 receives the test start signal, the control unit 50 takes out the address A = 1 included in the test start signal as a self-address and stores it in the memory, and the next fire detector 14 In order to set the address of -2, the received address A is increased by one to address A = A + 1 = 2, and when the detector test is completed, the increased address A = 2 is included in the test start signal and is secondary. Control is performed to output to the test start signal line 46b on the side. In addition to setting the received address A to be an increased address A = A + 1, the received address A may be increased by two or more multiple values, or may be increased by multiplying by a predetermined coefficient. It may be an address.

(Test start signal)
FIG. 4 is an explanatory diagram showing a test start signal that is a combination of a test start pulse and an address pulse used in the detector test.

FIG. 4A shows the format of the test start signal 60, for example, a test start pulse 62 having a pulse width of 8 milliseconds is combined with an address pulse 64 of 22 milliseconds, and the address pulse 64 is a 1-bit pulse of 1 millisecond. A 22-bit length address that combines 66 can be set.

4 (B) to 4 (I) show the test start signals 60-1 to automatically set the addresses A = 1 to 8 in the eight fire detectors 14 provided in the group G1 shown in FIG. It shows 60-8. For the test start signals 60-1 to 60-8, the test start pulse 62 is fixedly arranged at the beginning, and subsequently, the addresses A = 1 to 8 are displayed in binary. 1000 ... 0, 0100 ... 0, ~ The address pulses of 000 ... 0 are combined.

(Detector test operation)
FIG. 5 is a time chart showing the signal waveform of each signal line in the fire detector test, and the detector tests of the fire detectors 14-2 and 14-2 shown in FIG. 2 are taken as an example.

When performing a detector test, as shown in FIGS. 5A and 5B, the disaster prevention receiver 10 performs a repolarization control that alternately switches the polarity of the test voltage with respect to the test power lines 42 and 44 at predetermined time intervals. The right eye fire detection unit 48b of the fire detector 14 can be tested by turning the test power line 42 as a plus.

When the fire detector 14-1 receives the test start signal 60-1 shown in FIG. 4B via the test start signal line 46a at time t1, the test power line 44 is turned positive by the test start pulse 62. The right eye fire detection unit 48b of the fire detector 14 was tested in synchronization with the poles, and when the test was performed normally, the fire pulse signal from the test was sent to the disaster prevention receiver 10 as shown in FIG. 5 (G). It is transmitted by the signal line 38.

Subsequently, the left eye fire detection unit 48a of the fire detector 14 is tested in synchronization with the turning pole with the test power line 42 as a plus, and when the test is normally performed, as shown in FIG. 5 (G). The fire pulse signal from the test is transmitted to the disaster prevention receiving panel 10 by the fire signal line 38. Further, during the detector test, as shown in FIG. 5 (F), the test signal is output to the test signal line 40 to other fire detectors including the disaster prevention receiver 10 and the fire detector 14-2. Recognize that the detector is being tested.

The fire detector 14-1 extracts the address A = 1 from the received test start signal 60-1, stores it as a self-address in the memory, and increases the address by one as the address to be set in the next fire detector 14-2. Generate A = 2.

Subsequently, the fire detector 14-1 starts the test shown in FIG. 4 (C) on the test start signal line 46b on the secondary side at the timing t3 when the test power line 42 becomes positive when the detector test is completed. A test start signal 60-2 in which the pulse 62 is combined with the address pulse 64 having the address A = 2 is transmitted.

The second fire detector 14-2 receives the test start signal 60-2 transmitted by the fire detector 14-1 placed on the primary side from the test start signal line 46b and receives the test start signal line 46b of the fire detector 14-1. Perform the detector test as in the case. Further, the fire detector 14-2 extracts the address A = 2 from the received test start signal 60-2, stores it as a self-address in the memory, and increases it by one as the address to be set in the next fire detector 14-3. The address A = 3 is generated.

Subsequently, the fire detector 14-2 starts the test shown in FIG. 4 (D) on the test start signal line 46c on the secondary side at the timing t5 when the test power line 42 becomes positive when the detector test is completed. A test start signal 60-3 in which the pulse 62 is combined with the address pulse 64 having the address A = 3 is transmitted.

Hereinafter, the unique addresses A = 3 to 8 are automatically set for the remaining 6 fire detectors following the fire detector 14-2 through the same detector test.

(Disaster prevention receiver management information)
FIG. 6 is an explanatory diagram showing management information indicating the correspondence between the address of the fire detector registered in the disaster prevention receiver and the division.

In the memory provided in the control unit 16 of the disaster prevention receiving panel 10 shown in FIG. 1, the correspondence relationship between the addresses of the eight fire detectors 14 connected to each signal line shown in FIG. 6 and the automatic notification sections D1 to Dm. The management information indicating is stored and registered in advance.

In the management information of FIG. 6, the systems L1 to Ln are set for each signal line 12, and for example, the compartments D1 to D4 are set to the fire detectors 14 corresponding to the addresses 1 to 8 of the eight fire detectors corresponding to the system L1. It is set for every two units.

By registering such management information in the disaster prevention receiver 10 in advance, when a fire detection signal is received from the fire detector 14, the management information is searched by the address included in the fire detection signal and the corresponding section is determined. The automatic notification section that was acquired and detected the fire is displayed on the display of the display unit 22, and the automatic notification section that detected the fire is known and appropriate and prompt action is taken without having to go inside the tunnel and check the site. Is possible.

(Control operation of fire detector)
FIG. 7 is a flowchart showing the control operation of the fire detector. As shown in FIG. 7, when the control unit 50 of the fire detector 14 detects the turning pole with the test power supply line 42 as a plus in step S1 in response to the turning pole control by the detector test of the disaster prevention receiver panel 10, the step Proceeding to S2, when the reception of the test start signal from the primary side is detected in step S2, the process proceeds to step S3, the address A included in the test start signal is extracted and stored in the memory as a self-address, and then the next Add 1 to the received address A to set the address of the fire detector, and set A = A + 1.

Subsequently, in step S5, the testing signal is transmitted to the testing signal line 40 to perform the test on the right eye fire detection unit 48b side, and when the flame detection is determined by the test, the fire detection signal is transmitted to the disaster prevention receiving panel 10.

Subsequently, when a turning pole with the test power supply line 44 as a plus is detected in step S6, the process proceeds to step S7 to perform a test on the left eye fire detection unit 48a side, and when flame detection is determined by the test, a fire detection signal is sent to the disaster prevention receiver. Send to 10.

Subsequently, when a turning pole that makes the test power line 42 side positive again is detected in step S8, it is determined that the detector test is completed, the output of the test signal is stopped in step S9, the process proceeds to step S10, and step S4. A test start signal including the changed address A is generated and transmitted to the test start signal line on the secondary side.

When the automatic address setting by the detector test is completed, the process proceeds to step S11 to enter the fire detection monitoring state, and when the fire detection is determined in step S11, the process proceeds to step S12, including the self-address stored in the detector test. Generates a fire detection signal and periodically transmits the fire detection signal.

[Modification of the present invention]
(System that automatically sets the address on the terminal slave unit)
The point that addresses are automatically set for a plurality of fire detectors connected to the signal line through the detector test shown in the tunnel disaster prevention system of the above embodiment is that the address is not set for the signal line drawn from the general appropriate master unit. It can be applied to a system in which multiple terminal slave units are connected.

In such a system, the master unit is provided with a control unit that transmits an address setting signal including a predetermined address to the signal line, and each terminal slave unit connected to the signal line is the primary unit on the master unit side. When the address included in the address setting signal received from the side is taken out and stored, a control unit for transmitting the address setting signal including the address obtained by changing the received address to the secondary side is provided.

By providing such a system configuration, the master unit transmits an address setting signal including the start address to the terminal slave unit connected to the head of the signal line to set the address, and thereafter, the address is set. An address setting signal including an address that is incremented by, for example, one from the terminal set by the terminal slave unit that has finished Since it is not necessary to perform communication control to set an address individually for each machine, it is possible to reduce the control burden on the master unit side due to address setting and easily and surely automatically set an address unique to the terminal slave unit. And.

(Detector test)
The test of the fire detector by the disaster prevention receiver shown in the above embodiment is an example, the test start signal including the address is transmitted from the disaster prevention receiver, and the fire detector receives the test start signal from the primary side. If the detector test is performed, the address is extracted and stored as a self-address, and the test start signal including the changed address at the end of the test is transmitted to the secondary side, the repolarization control of the test power supply or It can be applied to the control of an appropriate detector test without being restricted by the output of the signal during the test.

(others)
In addition, the present invention includes appropriate modifications that do not impair its purpose and advantages, and is not further limited by the numerical values shown in the above embodiments.

10: Disaster prevention receiver 12: Signal line 14, 14-1, 14-2: Fire detector 16, 50: Control unit 18: Reception circuit unit 30a: Left eye light receiving unit 30b: Right eye light receiving unit 34: Power supply line 36 : Common line 38: Fire signal line 40: Test signal line 42, 44: Test power supply line 46a, 46b, 46c: Test start signal line 48a: Left eye fire detection unit 48b: Right eye fire detection unit 52: Test transmission unit 54 : Fire transmission unit 60: Test start signal 62: Test start pulse 64: Address pulse 66: 1-bit pulse

Claims (5)

A tunnel disaster prevention system in which a plurality of fire detectors disposed in the tunnel sequentially connected by a signal line comprising a plurality of signal lines, by connecting one end of the signal line to the disaster prevention receiving board to monitor the fire,
The fire detector carries out a predetermined test on its own machine based on a test start signal including a predetermined address received from the primary side of the predetermined signal line on the disaster prevention receiving panel side, and also self-identifies the address. When a fire is detected by setting the address of the machine and further transmitting a test start signal including the changed address included in the received test start signal to the secondary side of the predetermined signal line. the tunnel disaster prevention system and transmitting a fire detection signal denoted by the address of its own to the disaster received Release by another of said signal lines.
A tunnel disaster prevention system that monitors fires by sequentially connecting multiple fire detectors placed in the tunnel via a signal line including a test start signal line and a fire signal line, and connecting one end of the signal line to a disaster prevention receiver. There,
The fire detector carries out a predetermined test on the own machine based on the test start signal received from the primary side of the disaster prevention receiving panel side of the test start signal line, sets the address of the own machine, and sets a fire. A tunnel disaster prevention system characterized in that a fire detection signal with the address of the own machine is transmitted to the disaster prevention receiving panel by the fire signal line when the above is detected.
A tunnel in which a plurality of fire detectors arranged in a tunnel are sequentially connected by a signal line including a test start signal line and a fire signal line, and one end of the signal line of the signal line is connected to a disaster prevention receiving panel to monitor a fire. It ’s a disaster prevention system.
The fire detector carries out a predetermined test on its own machine based on a test start signal including a predetermined address received from the primary side of the disaster prevention receiving panel side of the test start signal line, and also self-identifies the address. When a fire is detected by setting a machine address and further transmitting a test start signal including an address obtained by changing the address included in the received test start signal to the secondary side of the test start signal line. A tunnel disaster prevention system characterized in that a fire detection signal with an address of the own machine is transmitted to the disaster prevention receiving panel by the fire signal line.
In the tunnel disaster prevention system according to claim 2 or 3, the test start signal line receives a signal from the primary side of the fire detector, which is the disaster prevention receiving panel side, and sends the signal to the secondary side of the fire detector. A tunnel disaster prevention system characterized in that a plurality of fire detectors are sequentially connected so as to transmit to the other connected fire detectors.
In the tunnel disaster prevention system according to claim 2 or 3, the fire signal line is a tunnel disaster prevention system in which a plurality of fire detectors are connected in parallel.

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