JP2023134692A - Disaster prevention system and fire detector - Google Patents

Abstract

To provide a disaster prevention system that can suppress a non-fire alarm by determining a reliability of a fire detector which has transmitted a fire signal.SOLUTION: In a tunnel disaster prevention system, a fire detector 12 connected to a disaster prevention receiver 10 to monitor a fire in a detection area is configured to: determine that there is a failure sign when the fire is determined in at least one fire determination stage of a plurality of fire determination stages for determining the fire, but the fire is not determined in any of remaining fire determination stages; determine its own reliability based on the number of occurrences of failure signs, which is the number of the failure signs determined; and determine that its own reliability has decreased when the number of occurrences of failure signs reaches a predetermined reliability determination accumulating condition, for example, when the number of occurrences of failure signs reaches a predetermined number of 2 or more.SELECTED DRAWING: Figure 1

Description

The present invention relates to a disaster prevention system and a fire detector that monitor fires in a tunnel using a fire detector connected to a signal line drawn out from a disaster prevention receiver.

Traditionally, in tunnels such as motorways, fire detectors have been installed to monitor fires in order to protect people and vehicles from fire accidents that occur inside the tunnels, and are connected to signal lines drawn out from disaster prevention receiver panels. are monitoring the fire.

Fire detectors have detection areas in both the left and right directions, and the detection areas of adjacent fire detectors overlap in a mutually complementary manner along the longitudinal direction of the tunnel, for example, at intervals of 25 m or 50 m. are arranged consecutively at intervals.

In addition, the fire detector monitors radiation, such as infrared rays, from fire flames generated inside the tunnel through a transparent window, and in order to maintain the flame monitoring function, the sensitivity of the light receiving element is checked. sensitivity tests and dirt tests to monitor dirt on translucent windows.

However, with such conventional fire detectors, if the deterioration of the fire detector progresses over a long period of operation, the sensitivity test will not detect a sensor failure or the dirt test will not detect any fouling abnormalities, and the detector will continue to function normally. Even if it appears to be in operation, there is a possibility that the fire detector will output a fire detection signal and the disaster prevention receiver will issue a non-fire alarm. Until it is confirmed that this is the case, vehicles must be prohibited from passing through the tunnel by issuing a no-entry warning using warning display board equipment, etc., and a person in charge must go to the site to confirm the situation. It takes a lot of time, and the impact of traffic congestion is not small.

For this reason, a tunnel disaster prevention system has been proposed in which a disaster prevention receiver panel determines the degree of deterioration based on environmental stresses such as temperature, humidity, impact vibration, and electrical noise of fire detectors and provides notification. By being able to grasp the progress of detector deterioration, it is possible to take measures such as replacing the fire detector with a spare fire detector before a non-fire alarm is issued.

In addition, in conventional tunnel disaster prevention systems, when the disaster prevention receiver receives a fire signal from a fire detector, in order to prevent non-fire alarms, the fire detector is temporarily restored after a predetermined period of time, and then restarted again for a predetermined period of time. If a fire signal is received within that time, it will be determined that there is a fire and a warning will be issued using alarm display board equipment, etc.

Japanese Patent Application Publication No. 2002-246962 Japanese Patent Application Publication No. 2016-128796 Japanese Patent Application Publication No. 2018-169893

However, if such conventional fire detectors transmit a fire signal due to an incorrect fire judgment due to a malfunction or an unexpected non-fire cause, even after the system is restored, the malfunction or non-fire If the cause of the fire has not been resolved, the fire signal may be sent again, so problems caused by non-fire alarms still remain.

An object of the present invention is to provide a disaster prevention system and a fire detector that can suppress non-fire alarms by determining the reliability of a fire detector that has transmitted a fire signal.

(Third invention: Fire detector 1)
The present invention provides a fire detector that connects to a disaster prevention receiver panel and monitors fires in a detection area.
Determine failure signs based on predetermined conditions, judge own reliability based on the number of occurrences of failure signs, which is the number of determined failure signs,
It is characterized in that when the number of occurrences of failure signs reaches a predetermined number of 2 or more, it is determined that the reliability of the device itself has decreased.

(Fourth invention: Fire detector 2)
Another form of the present invention is a fire detector that is connected to a disaster prevention receiver panel and monitors fires in a detection area.
Fires are judged using multiple fire judgment stages.
If a fire is determined to be a fire in at least one of the multiple fire determination stages, but a fire is not determined to be a fire in any of the remaining fire determination stages, it is determined to be a failure sign, and the number of failure signs determined. determines its own reliability based on the number of occurrences of failure signs,
The device is characterized in that it is determined that its own reliability has decreased when the number of occurrences of failure signs satisfies a predetermined reliability judgment accumulation condition.

(Fifth invention: Fire detector 3)
Another form of the present invention is a fire detector that is connected to a disaster prevention receiver panel and monitors fires in a detection area.
We are conducting a test to determine the failure of the fire detection unit based on the light reception signal when driving the test light source.
If the level of the received light signal in the test does not satisfy the predetermined normality judgment conditions and the predetermined failure judgment conditions, it is judged as a failure sign, and self-confidence is determined based on the number of failure signs that have occurred, which is the number of judged failure signs. determine gender,
The device is characterized in that it is determined that its own reliability has decreased when the number of occurrences of failure signs satisfies a predetermined reliability judgment accumulation condition.

(Sixth invention: Fire detector 4)
Another form of the present invention is a fire detector that is connected to a disaster prevention receiver panel and monitors fires in a detection area.
If a fire is determined by multiple fire determination stages, and a fire is determined as a fire in at least one of the multiple fire determination stages, but a fire is not determined as a fire in any of the remaining fire determination stages. It is determined that this is the first sign of failure,
A test is being conducted to determine the failure of the fire detection unit based on the received light signal when the test light source is driven, and the level of the received light signal from the test does not satisfy the specified normality judgment conditions and the specified failure judgment conditions. It was determined that this was a sign of a second failure.
Self-confidence based on either or both of the number of occurrences of the first failure sign, which is the number of times the first failure sign has been determined, and the number of occurrences of the second failure sign, which is the number of times the second failure sign has been determined. determine gender,
It is characterized in that when either or both of the number of occurrences of the first failure sign and the number of occurrences of the second failure sign satisfy a predetermined reliability judgment accumulation condition, it is determined that the reliability of the device itself has decreased. .

(Reliability judgment accumulation condition)
The reliability judgment accumulation condition for determining a decrease in the reliability of the device is a condition that is satisfied when the number of occurrences of a failure sign reaches a predetermined number of times of 2 or more.

(unreliability signal)
When determining that its own reliability has decreased, it transmits a reliability decrease signal that includes information on the determined decrease in its own reliability.

(Stop sending fire signal)
In the fire detector of the third to sixth inventions, when it is determined that the reliability of the fire detector has decreased, the transmission of the fire signal that is transmitted when a fire is determined is stopped.

(Judgment of reliability)
One's own reliability is judged in multiple stages depending on the degree of reliability.

(Seventh invention: Disaster prevention system)
Another form of the present invention is a disaster prevention system that monitors fires in a detection area by connecting the fire detector according to any one of the third to sixth inventions to a disaster prevention receiving board,
When the disaster prevention receiver receives a reliability reduction signal sent by a fire detector that has determined that its own reliability has deteriorated, it changes the conditions for determining that there is a fire for the fire detector to more stringent conditions. When the fire detector receives a fire signal that is transmitted when a fire is detected from the fire detector and at least one of the adjacent fire detectors that are redundantly monitoring the detection area of the fire detector, It is characterized by fire treatment.

(Third invention: Effect of fire detector 1)
The present invention determines failure signs based on predetermined conditions, determines its own reliability based on the number of occurrences of failure signs, which is the determined number of failure signs, and determines whether the failure sign occurs a predetermined number of times of 2 or more. Since it is determined that the reliability of the detector itself has decreased when the reliability of the detector has decreased, it is possible to prevent a non-fire alarm from occurring due to malfunction of a fire detector whose reliability has been determined to have decreased.

(Fourth invention: Effect of fire detector 2)
Further, in another embodiment of the present invention, in a fire detector that is connected to a disaster prevention receiver panel and monitors fires in a detection area, a fire is determined by a plurality of fire determination stages. If a fire is determined to be a fire in at least one of the fire determination stages, but it is not determined as a fire in any of the remaining fire determination stages, it is determined to be a failure sign, and the occurrence of a failure sign is the number of failure signs determined. Since the reliability of the self is judged based on the number of occurrences, and when the number of occurrences of failure signs satisfies the predetermined reliability judgment accumulation conditions, it is judged that the self reliability has decreased, so the fire detector has multiple fire judgment stages. By determining the number of occurrences of failure signs that did not result in a fire being determined as a fire during the process and using this as the basis for determining reliability, even if a fire detector has determined a fire, failures will not occur. When the number of occurrences of a warning sign is large, it is determined that the reliability is low because there is a high possibility that it is a non-fire alarm, and it is possible to reliably prevent fire disposal due to a non-fire alarm.

(Fifth invention: Effect of fire detector 3)
Another aspect of the present invention is that in a fire detector that is connected to a disaster prevention receiver panel and monitors fires in a detection area, failure of the fire detection unit is determined based on a light reception signal when a test light source is driven. If a test is being conducted and the level of the received light signal from the test does not satisfy the predetermined normality judgment conditions and the predetermined failure judgment conditions, it is determined to be a failure sign, and the occurrence of a failure sign is the number of times the failure sign has occurred. The reliability of the fire detector is determined based on the number of times the fire detector tests its own reliability, and when the number of occurrences of failure signs satisfies the predetermined reliability judgment accumulation conditions, it is determined that the reliability of the fire detector has decreased. If the level does not satisfy the predetermined normality judgment conditions and failure judgment conditions, it is determined to be a failure sign, and the number of occurrences of the failure sign is used as the basis for determining reliability. Even if a failure is not detected, if a failure sign occurs frequently, it is likely that it is a non-fire alarm, so it is determined that reliability has deteriorated, and it is possible to reliably prevent fire treatment due to non-fire alarms. shall be.

(Sixth invention: Effect of fire detector 4)
Further, in another embodiment of the present invention, in a fire detector that is connected to a disaster prevention receiver panel and monitors fires in a detection area, a fire is determined by a plurality of fire determination stages. If a fire is determined to be a fire in at least one of the fire determination stages, but it is not determined to be a fire in any of the remaining fire determination stages, it is determined to be the first failure sign, and the light reception signal is generated when the test light source is driven. We conduct tests to determine the failure of the fire detection unit based on the following, and if the level of the received light signal in the test does not meet the predetermined normality judgment conditions and the predetermined failure judgment conditions, it is determined to be a sign of a second failure. , based on either or both of the number of occurrences of the first failure sign, which is the number of determined first failure signs, and the number of occurrences of the second failure sign, which is the number of determined second failure signs. Reliability is determined, and when either or both of the number of occurrences of the first failure sign and the number of occurrences of the second failure sign satisfy a predetermined reliability judgment accumulation condition, it is determined that the self-reliability has decreased. Therefore, an effect that combines the effects of the fire detector 2 of the fourth invention and the fire detector 3 of the fifth invention described above can be obtained.

(Effect of stopping fire signal transmission)
In addition, in the fire detectors of the third to sixth inventions, when it is determined that the reliability of the detector itself has decreased, the transmission of the fire signal that is transmitted when it is determined that there is a fire is stopped, so the reliability is decreased. It is possible to prevent the occurrence of non-fire alarms due to the reception of fire signals from fire detectors that have been determined to be fire alarms.

(Seventh invention: Effect of tunnel disaster prevention system)
Further, another form of the present invention is a disaster prevention system in which a fire detector according to any one of the third to sixth inventions is connected to a disaster prevention reception board to monitor a fire in a detection area. When a detector determines that its own reliability has deteriorated and receives a reliability reduction signal that it sends, the conditions for determining a fire in the fire detector are changed to stricter conditions and the fire is restored. When receiving a fire signal that is transmitted when a fire is determined from the detector and at least one adjacent fire detector that is redundantly monitoring the detection area of the fire detector, predetermined fire processing is performed. This makes it possible to correctly judge a fire and deal with it appropriately.

Explanatory diagram showing an overview of the tunnel disaster prevention system Explanatory diagram showing the detection area of a fire detector Explanatory diagram showing the appearance of a fire detector Block diagram showing an overview of the functional configuration of a fire detector Flowchart showing control operation of fire detector Block diagram showing an overview of the functional configuration of the disaster prevention reception panel Time chart showing control operations when the disaster prevention receiver panel determines that the fire detector is reliable Time chart showing control operations when the disaster prevention receiver panel determines that the reliability of the fire detector has decreased. Time chart showing the control operation of the disaster prevention receiver when a failure sign is received from a fire detector Explanatory diagram showing the peak level of the received light signal and the number of failure signs when the internal test light source is driven during a fire detector sensitivity test Flowchart showing fire detector sensitivity test with determination of signs of failure

[Tunnel disaster prevention system]
[Basic concept of embodiment]
FIG. 1 is an explanatory diagram showing an overview of a tunnel disaster prevention system, and FIG. 2 is an explanatory diagram showing a detection area of a fire detector. The basic concept of the tunnel disaster prevention system according to this embodiment is that the fire detector 12 in the tunnel connected to the signal lines 14a and 14b for each signal system from the disaster prevention receiving board 10 is activated by The disaster prevention receiving board 10 at least temporarily holds failure sign information based on the failure sign, for example, failure sign information indicating the number of times the failure sign has occurred, and when receiving a fire signal from the fire detector 12, the disaster prevention receiving board 10 receives the failure sign from the fire detector 12. The reliability of the fire detector 12 is evaluated and determined by acquiring the information, and when it is determined that the reliability is reliable, the predetermined fire treatment is performed when a fire signal is received again after the fire detector 12 is restored. , when it is determined that the reliability has decreased, the predetermined first fire judgment accumulation condition (for example, the first accumulation number threshold) of the fire detector 12 is changed to a second fire judgment accumulation condition that is stricter than the first fire judgment accumulation condition. The fire detection accumulation condition is changed to the fire detection accumulation condition (the second accumulation frequency threshold is greater than the first accumulation frequency threshold), and the fire detector 12 with the changed fire detection accumulation condition and the detection area of the fire detector 12 are redundantly monitored. When the fire detector 12 receives a fire signal from at least one of the adjacent fire detectors, the fire detector 12 performs a prescribed fire treatment. Even if a signal is transmitted, the reliability is evaluated based on the failure sign information of the fire detector 12 that transmitted the fire signal, and it is determined that the reliability is present or has decreased. If it is determined that the reliability is decreased, it is considered that there is no fire. Furthermore, it is possible to prevent tunnel passage from being stopped due to non-fire alarms more reliably than in the past without performing fire treatment accompanied by warnings for prohibiting entry into the tunnel.

In addition, even if the reliability is evaluated from the failure sign information of the fire detector 12 and it is determined that the reliability has deteriorated, it may be considered as a non-fire alarm, but if it is an actual fire, the first alarm will be By changing the first fire judgment accumulation condition of the fire detector that transmitted the fire signal to the strict second fire judgment accumulation condition, it became difficult to issue a non-fire alarm, and at the same time, the fire judgment accumulation condition was changed. By receiving a fire signal from the fire detector and at least one adjacent fire detector that is redundantly monitoring the detection area of the fire detector, the system determines that there is a fire and takes steps to dispose of the fire, including issuing a tunnel entry prohibition warning. fires, so that fires can be reliably detected and dealt with.

Furthermore, by having the disaster prevention receiving board 10 determine the reliability of the fire detector, the burden on the fire detector 12 side is reduced.

Furthermore, environmental factors such as temperature, humidity, and electrical noise may be unique to each tunnel, each signal system, or each section. Evaluate the reliability of the fire detector 12 for each tunnel, signal system, and section based on failure sign information indicating the number of failure signs that occur in the fire detector 12 installed in each unit, and determine whether it is reliable or has decreased reliability. can be judged.

Note that the failure sign in this embodiment refers to a phenomenon that predicts a failure that will occur in the future, and can also be referred to as a sign of a failure, a sign of a failure, a preview of a failure, etc.

Further, in the example of FIG. 1, the signal system and the tunnel correspond one-to-one, but for example, one tunnel can be provided with a plurality of signal systems. Alternatively, a plurality of tunnels can be made into one signal system, and the relationship between the signal system and the tunnel is arbitrary.

In addition, in the following description, the description of FIGS. 1 to 9 corresponds to the tunnel disaster prevention system of the first invention and the fire detectors of the third and fourth inventions, and the description of FIGS. 10 to 11 corresponds to the second and seventh inventions. It corresponds to the tunnel disaster prevention system of the invention and the fire detector of the fifth and sixth inventions. Note that the fire detectors of the third to sixth inventions do not prevent only one fire detector from being connected to one signal system.

[Overview of tunnel disaster prevention system]
As shown in FIG. 1, an upline tunnel 1a and a downline tunnel 1b are constructed as tunnels for a motorway. Inside the up-line tunnel 1a and the down-line tunnel 1b, fire detectors 12 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 12 is equipped with two sets of fire detection parts, one for the right eye and the other for the left eye.As shown in FIG. The fire detectors 12 and the detection area 15 which are arranged adjacent to each other are successively arranged so as to complement each other and overlap each other, for example, in the right eye 13R and the left eye 13L, and detect fires occurring within the detection area 15. Monitor and detect fires by observing infrared rays from flames.

In addition, the up-line tunnel 1a and the down-line tunnel 1b are equipped with emergency facilities such as manual reporting devices and emergency telephones for reporting fires, and fire hydrant systems for extinguishing fires and preventing the spread of fire. Water spray equipment that sprays fire extinguishing water from a water spray head is installed to protect the inside of the tunnel body and ducts from fire, but is not shown.

A power signal line and signal lines 14a, 14b are drawn out from the disaster prevention receiving board 10 to the up line tunnel 1a and the down line tunnel 1b, and a plurality of fire detectors 12 are connected to each of them. A unique address has been set. In the following description, the signal lines 14a and 14b may be referred to as the signal line 14 when there is no need to distinguish between them.

In addition, for the disaster prevention receiver 10, a fire pump equipment 16, a cooling pump equipment 18 for ducts, an IG slave station equipment 20, a ventilation equipment 22, an alarm display board equipment 24, a radio rebroadcast equipment 26, and a television monitoring equipment 28 are provided. and lighting equipment 30, etc., and the fire detector 12 and the disaster prevention receiving panel 10 communicate via a signal line 14 in a so-called R-type transmission system.

Here, the IG slave station equipment 20 is a communication equipment that connects the disaster prevention receiving board 10 and the remote monitoring and control equipment 32, which is an externally provided host equipment, via a network.

The ventilation equipment 22 is equipment that generates ventilation flow in the longitudinal direction of the tunnel by operating a jet fan installed on the ceiling side of the tunnel.

The alarm display board facility 24 is a facility that notifies users of information such as a no-entry warning due to a fire by displaying it on an electronic display board. The radio rebroadcast facility 26 is a facility that allows drivers and the like to receive information from road administrators inside the tunnel. The television monitoring equipment 28 is equipment for checking the scale and location of a fire, operating water spray equipment, and grasping the situation inside the tunnel when conducting evacuation guidance. The lighting equipment 30 is equipment that drives and manages lighting equipment in the tunnel.

[Fire detector]
(Appearance of fire detector)
FIG. 3 is an explanatory diagram showing the external appearance of the fire detector, and FIG. 4 is a block diagram showing an outline of the functional configuration of the fire detector.

As shown in FIG. 3, the fire detector 12 includes two sets of light-transmitting windows 50R and 50L divided into left and right in the sensor housing section 46 provided at the top of the housing 44. , 50L are each equipped with a built-in sensor section. In addition, two sets of light-transmitting windows for test light sources are installed near the light-transmitting windows 50R, 50L, in positions where the sensor parts can be seen through, which house external test light sources used for dirt tests on the light-transmitting windows 50R, 50L. 52R and 52L are provided.

In the following description, the light-transmitting window 50R may be referred to as the right-eye light-transmitting window 50R, and the light-transmitting window 50L may be referred to as the left-eye light-transmitting window 50L.

(Schematic configuration of fire detector)
As shown in FIG. 4, the fire detector 12 includes a detector control section 54, a transmission section 56, a power supply section 58, two sets of left and right fire detection sections 60R and 60L, a test light emission drive section 76, and a light emission drive section 76 used for sensitivity testing. Internal test light sources 78R, 80R, 82R, internal test light sources 78L, 80L, 82L, and external test light sources 84R, 84L used for dirt tests are provided. In the following description, the fire detection section 60R may be referred to as a right eye fire detection section 60R, and the fire detection section 60L may be referred to as a left eye fire detection section 60L.

The detector control unit 54 is a function realized by executing a program, for example, and the hardware includes a computer circuit including a CPU, memory, various input/output ports, and the like.

The transmission section 56 is connected to the disaster prevention receiving board 10 shown in FIG. 1 by the transmission line S of the signal line 14 and the transmission common line SC, and various signals are transmitted and received by R-type transmission.

The power supply section 58 receives power supply from the disaster prevention receiving panel 10 shown in FIG. A predetermined power supply voltage is supplied to the detection units 60R, 60L and the test light emission drive unit 76.

The test light emission drive unit 76 is connected to internal test light sources 78R, 80R, 82R, 78L, 80L, and 82L used for sensitivity tests, and external test light sources 84R and 84L used for dirt tests, respectively. A krypton lamp is provided as an element.

(Fire detection section)
The fire detection sections 60R, 60L include sensor sections 64, 68, 72 and amplification processing sections 66, 70, 74. For example, taking the right eye fire detection section 60R as an example, the right eye light-transmitting window 50R provided in the sensor housing section 46 is arranged in front of the sensor sections 64, 68, and 72; Infrared energy from an external detection area is incident on the sensor sections 64, 68, and 72 via 50R.

The right eye fire detection unit 60R monitors fire using, for example, three-wavelength flame detection. The sensor unit 64 selectively transmits infrared rays in the 4.5 μm band, which is a resonance radiation band of CO2 peculiar to flames, out of the infrared energy that has entered through the right eye translucent window 50R. The infrared rays are received by the light receiving sensor and subjected to photoelectric conversion, and then subjected to predetermined processing such as amplification by the amplification processing section 66, and sent to the detector control section 54 as a flame light reception signal E1R corresponding to the amount of received light energy. Output.

The sensor unit 68 selectively transmits infrared energy in a first non-flame wavelength band, for example, a 5.0 μm band, out of the infrared energy that has entered through the right eye translucent window 50R, using an optical wavelength bandpass filter. (pass), is received by the light receiving sensor, photoelectrically converted, and then subjected to predetermined processing such as amplification by the amplification processing section 70 to be converted into the first non-flame light reception signal E2R corresponding to the amount of received light energy by the detector control section. Output to 54.

The sensor unit 72 selectively transmits infrared energy of, for example, 2.3 μm, which is a second non-flame wavelength band, out of the infrared energy that has entered through the right eye transparent window 50R ( After the light is received by the light receiving sensor and subjected to photoelectric conversion, it is subjected to predetermined processing such as amplification by the amplification processing section 74, and is output to the detector control section 54 as a second non-flame light reception signal E3R corresponding to the amount of received light energy. Output to.

The amplification processing units 66, 70, and 74 are provided with a preamplifier, a frequency filter that selectively passes a predetermined frequency band including the flame fluctuation frequency, a main amplifier, and the like.

(Fire judgment)
The detector control section 54 is provided with the function of a fire determination section 86 as a function realized by executing a program. The fire determination unit 86 determines a fire through a plurality of fire determination stages based on the flame reception signal E1R, the first non-flame reception signal E2R, and the second non-flame reception signal E3R. The fire determination unit 86 performs fire determination in the following three stages, for example.

When the flame reception signal E1R is equal to or higher than a predetermined threshold, the fire determination unit 86 calculates the relative ratio (E1R/E2R) with the first non-flame reception signal E2R, and calculates the relative ratio (E1R/E2R). exceeds a predetermined threshold, it is determined that the first stage fire determination conditions are satisfied, a fire (fire candidate) is detected, and the next second stage fire determination is performed.

The second stage of fire determination by the fire determination unit 86 is to calculate the relative ratio (E1R/E3R) of the flame reception signal E1R to the second non-flame reception signal E3R, and to determine whether the relative ratio (E1R/E3R) is a predetermined value. If the threshold value is exceeded, it is determined that the fire determination conditions of the second stage are satisfied and a fire has occurred.

Subsequently, the fire determination unit 86 performs the next third stage of fire determination. The third stage fire determination condition by the fire determination unit 86 is to perform fast Fourier transform (FFT) on the flame reception signal E1R and analyze the result, for example, the relative strength of the low frequency component of 4 Hz or less and the high frequency component of more than 4 Hz and 8 Hz or less. The relative ratio of the relative intensities of the side components is calculated, and if this relativization is equal to or greater than a predetermined threshold value, it is determined that the third stage fire determination conditions are satisfied and a fire occurs. This means that a fire has been determined in all of the fire determination stages in step 3, and the fire is determined as a whole.

Furthermore, if the fire determination conditions of the first to third stages are satisfied a predetermined number of times in succession, a fire is determined as having satisfied the predetermined fire determination accumulation conditions, and a fire signal is transmitted to the disaster prevention receiving board 10. I do. The same process is performed for the left eye fire detection section 60L.

Note that the fire determination by the fire determination unit 86 based on multiple fire determination stages is not limited to the fire determination described above, and one or more fire determination stages may be added, for example, any one of the above three stages may be added. may be omitted and the process may be performed in two stages. Alternatively, for example, there may be four stages including up to the accumulation determination stage.

(Determination of signs of failure)
The fire determination unit 86 determines that a failure sign has occurred when a fire is not determined to be a fire during the three fire determination stages described above, and calculates the number of times N of failure signs to occur using a counter. Perform counting control.

Further, the fire determining unit 86 determines that the failure sign is a failure sign (determined ), transmits a failure sign signal to the disaster prevention receiver 10, and then performs a predetermined failure sign process. Note that the fire determining unit 86 may further perform a predetermined failure sign process when the number of confirmed failure signs reaches a predetermined number.

The predetermined failure sign processing performed by the fire determination unit 86 includes, for example, a process of stopping the transmission of a fire signal, a process of increasing a threshold value for the number of accumulations of fire determinations, and tightening the fire determination accumulation conditions. The failure sign processing that stops the transmission of fire signals stops the transmission of fire signals and detects non-fire conditions, since even if a fire is determined after determining failure signs, there is a high possibility that the fire will be incorrectly determined due to a failure. The idea is to prevent the occurrence of information. Note that the process of stopping the transmission of the fire signal may not be performed.

In addition, when the fire determination unit 86 receives the internal state request command signal from the disaster prevention receiver 10, it performs control to generate and transmit failure sign information indicating the number N of occurrences of the failure sign obtained at that time, The disaster prevention receiver 10 is used to evaluate the reliability of the fire detector 12 based on the number of occurrences N of failure signs extracted from the acquired failure sign information, and to determine whether the fire detector 12 is reliable or has decreased reliability. Incidentally, the reliability reduction may be divided into multiple stages depending on the degree, so that, for example, a reliability reduction state and an unreliability state can be distinguished.

Note that the number of occurrences N of failure signs counted by the counter is reset every predetermined period, or when a predetermined period has elapsed since the failure signs were counted. However, the number N of occurrences of failure signs before reset may be stored as failure sign information.

(Sensitivity test)
The detector control section 54 is provided with the function of a sensitivity test section 88 as a function realized by executing a program. The sensitivity test section 88 operates when it receives a test instruction signal specifying its own address from the disaster prevention receiver 10 via the transmission section 56, and instructs the test light emission drive section 76 to turn on the internal test light sources 78R, 80R. , 82R, 78L, 80L, and 82L are sequentially driven to emit light to conduct a sensitivity test of the fire detection units 60R and 60L. Note that the internal test light sources 78R, 80R, and 82R and the internal test light sources 78L, 80L, and 82L may each be used as one light source.

For example, taking the circuit system of the sensor section 64 and the amplification processing section 66 in the right eye fire detection section 60R as an example, the test light emission drive section 76 emits a false flame corresponding to fire flame by driving the internal test light source 78R to emit light. (infrared light simulating flame) is made to enter the sensor section 64.

Regarding the circuit blocks of the sensor section 64 and the amplification processing section 66, the reference received light value during the initial sensitivity test at the time of shipment from the factory is stored in memory, and the detected received light value obtained during the sensitivity test at system startup is the reference received light value. The detection sensitivity coefficient obtained by dividing the detected light receiving value by the reference light receiving value is 1. As the operating period passes, the detected light reception value gradually decreases, and the detection sensitivity coefficient decreases in the order of 0.9, 0.8, 0.7, and so on.

When the detection sensitivity coefficient decreases to 1 or less in this way, the sensitivity test section 88 calculates a correction coefficient that is the reciprocal of the detection sensitivity coefficient, stores it in the memory, and applies the correction coefficient to the received light value detected in the subsequent operation state. The sensitivity is corrected by multiplication, and the fire determination unit 86 determines a fire based on the sensitivity-corrected received light value.

Further, in the sensitivity test section 88, a sensitivity correction limit threshold corresponding to a correction coefficient that is the limit of sensitivity correction, for example, a sensitivity correction limit threshold of 0.5, is set in advance, and the sensitivity coefficient obtained in the sensitivity test is set in advance. If the value is below the correction limit threshold or below the sensitivity correction limit threshold, it is determined that the sensitivity of the sensor unit 64 is abnormal, and the transmitter 56 is instructed to set information indicating the sensitivity abnormality in the response signal to the call signal that matches the self address. Then, control is performed to transmit a sensitivity abnormality signal to the disaster prevention receiving board 10.

In addition, in the sensitivity test section 88, a sensitivity abnormality sign threshold of 0.6, for example, is preset, corresponding to a sensitivity coefficient that indicates a sign of a sensitivity abnormality before reaching the sensitivity correction limit, and is set in advance as a sensitivity abnormality sign threshold of 0.6. If the detected sensitivity coefficient is less than or equal to the sensitivity abnormality sign threshold, it is determined that this is a sign of a sensitivity abnormality state in which there is a high possibility that sensitivity correction will not be possible in the near future, and the transmission unit 56 is instructed to detect the sensitivity abnormality. Control is performed to transmit and notify a sensitivity abnormality sign signal indicating a sign of failure to the disaster prevention receiving board 10.

In addition, when the sensitivity testing section 88 determines that a sign of a sensitivity abnormality is detected, this is regarded as a sign of a failure, and the counter of the fire judgment section 86 performs a counting operation to increase the number of occurrences N of the failure sign. You can also do it.

Further, when the detection sensitivity coefficient increases to 1.1, 1.2, 1.3, etc. as the operating period passes, it is corrected in the same way, and when it reaches the limit, it is determined to be abnormal.

Sensitivity tests are similarly performed on the circuit systems of the sensor section 68 and the amplification processing section 70 and the sensor section 72 and the amplification processing section 74. Furthermore, a sensitivity test is similarly performed on the left eye fire detection section 60L by driving the internal test light sources 78L, 80L, and 82L to emit light using the test light emission drive section 76.

(stain test)
The detector control section 54 is provided with the function of a dirt test section 90 as a function realized by executing a program. Similar to the sensitivity test, the dirt test section 90 operates when it receives a test instruction signal specifying its own address from the disaster prevention reception board 10 via the transmission section 56, and instructs the test light emission drive section 76 to The external test light sources 84R and 84L are sequentially driven to emit light to perform a dirt test on the translucent windows 50R and 50L.

For example, in the case of a dirt test on the translucent window 50R, the test light emission driving unit 76 drives the external test light source 84R to emit a flame simulant light corresponding to a fire flame on the translucent window 52R for the test light source. And the light is made to enter the sensor section 64 via the light-transmitting window 50R. The light-transmitting window 52R for the test light source and the light-transmitting window 50R are not dirty when shipped from the factory, and the light reception value obtained in the dirt test at that time is stored in the memory as the reference light reception value, and the light attenuation rate calculation is performed. used for.

The detected light receiving value obtained in the dirt test at system startup almost matches the standard light receiving value, and the light attenuation rate obtained by subtracting the detected light receiving value from the standard light receiving value divided by the standard light receiving value is 0. There is. As the operating period passes, dirt adheres to the translucent window 50R, and the light attenuation rate gradually increases to 0.1, 0.2, 0.3, and so on.

When the light attenuation rate increases in this way, the stain test section 90 determines the light attenuation rate by the stain test, and also calculates a correction value that is the reciprocal of (1 - light attenuation rate) and stores it in memory for subsequent operation. Dirt correction is performed by dividing the light reception value detected in the state (the light reception value corrected by the correction value of the sensitivity test) by the correction value, and the fire determination unit 86 determines a fire based on the dirt correction corrected light reception value.

Further, in the dirt test section 90, a dirt threshold value, for example, dirt threshold value 0.5, which is a light attenuation rate corresponding to the limit of dirt correction is preset, and the light attenuation rate determined by the dirt test is equal to or higher than the dirt threshold value. Or, if the dirt exceeds the dirt threshold, it is determined that there is a dirt abnormality that makes it impossible to correct the dirt on the translucent window 50R, and instructs the transmission unit 56 to include dirt abnormality information in the response signal to the call signal that matches the own address. Control is performed to set and send a pollution signal to the disaster prevention receiver 10 for notification.

Further, in the dirt test section 90, a dirt indicator threshold value, for example, a dirt indicator threshold value of 0.6, which is a light attenuation rate corresponding to the indicator stage where the dirt correction reaches its limit, is preset, and the dirt indicator threshold value 0.6 is set in advance. If the light rate is equal to or higher than the contamination sign threshold or exceeds the contamination sign threshold, it is determined that the contamination sign state is likely to become impossible in the near future, and the transmission section 56 is instructed. control is performed to send a contamination sign signal to the disaster prevention receiving panel 10 for notification.

In addition, when the contamination test section 90 determines that there is a sign of contamination, this is regarded as one of the signs of failure, and the counter of the fire judgment section 86 performs a counting operation to increase the number N of occurrences of the sign of failure. Also good.

(Fire detector control operation)
FIG. 5 is a flowchart showing the control operation of the fire detector, which is the control operation by the fire determination section 86 shown in FIG.

As shown in FIG. 5, for example, taking the fire detection section 60R of FIG. The non-flame reception signal E2R and the second non-flame reception signal E3R are taken in by AD conversion, and if the flame reception signal E1R is equal to or higher than a predetermined value in step S2, the process proceeds to step S3, where the flame reception signal E1R and the first non-flame reception signal E1R are taken in. The ratio (E1R/E2R) of the received light signal E2R is calculated, and if it is equal to or greater than a predetermined value, the first step fire determination condition is satisfied and the process proceeds to step S4. The ratio (E1R/E3R) of the signal E3R is calculated, and if it is equal to or greater than a predetermined value, it is determined that the second stage fire determination condition is satisfied and the process proceeds to step S5.

Subsequently, the fire determination unit 86 performs fast Fourier transform (FFT calculation) on the flame reception signal E1R in step S5, and determines the relative intensity ratio of the low frequency component of, for example, 4 Hz or less and the high frequency component of more than 4 Hz and 8 Hz or less in step S6. If is greater than or equal to a predetermined value, it is determined that the fire determination condition of the third stage is satisfied and the process proceeds to step S7, and the fire determination conditions of the first to third stages in steps S1 to S6 are continuously satisfied for a predetermined accumulation number threshold. Determine whether or not.

Subsequently, when the fire determination unit 86 satisfies the accumulation count threshold value as a predetermined fire determination accumulation condition in step S7, the process proceeds to step S8 and determines that there is a fire, and sends a fire signal to the disaster prevention receiver 10 to carry out fire processing. Let it happen. Subsequently, when it is determined in step S9 that a fire recovery signal (restoration instruction signal) has been received from the disaster prevention receiver 10, the fire detection is restored to the initial state in step S10, and the process returns to step S1.

On the other hand, if the fire determination condition of the first stage is not satisfied in step S3, the fire determination unit 86 determines that a failure sign has occurred, and proceeds to step S11 to set a counter N for counting the number of occurrences of a failure sign. is set to +1 (incremented), and if in step S12 the number of occurrences of failure signs N is less than the predetermined threshold number of times Nth, the process from step S1 is repeated.

Further, if the fire determination condition in the first stage of step S3 is satisfied, but the fire determination condition in the second stage of step S4 is not satisfied, the fire determination unit 86 proceeds to step S11 to determine whether the failure sign has occurred. A counter N for counting the number of times is set to +1, and if the number N of failure sign occurrences is less than the predetermined threshold number Nth in step S12, the process from step S1 is repeated.

Furthermore, if the fire determination conditions of the first stage of step S3 and the second stage of step S4 are satisfied, but the fire determination conditions of the third stage of step S6 are not satisfied, the fire determination unit 86 Proceeding to step S12, a counter N for counting the number of occurrences of a failure sign is set to +1, and in step S12, if the number of failure sign occurrences N is less than a predetermined threshold number of times Nth, the process from step S1 is repeated.

By repeatedly counting the number of occurrences of failure signs in this manner, the fire determining unit 86 detects failure signs when the failure sign judgment accumulation condition is satisfied such that the number of failure signs occurrences N is equal to or greater than a predetermined threshold number of times Nth in step S12. It is determined (confirmed) that the process proceeds to step S13, where a failure sign signal is transmitted to the disaster prevention receiver 10 for notification, and then, in step S14, a predetermined failure sign process is performed.

In addition, in step S13, even if the sufficiency determination of the failure sign judgment accumulation condition of whether the number of failure sign judgments in step S12 reaches a predetermined threshold number of times is added to the failure sign judgment accumulation condition of step S12. good.

Further, the failure sign processing, for example, increases the accumulation count threshold value in step S7 to make the fire judgment accumulation conditions stricter. Furthermore, the fire detector 12 stops at least the latter of the monitoring operations in steps S1 to S7 and the transmission of the fire signal in step S8.

Note that if the relative ratio is less than a predetermined value in step S3, the process may return to step S1, and if it is determined in step S7 that the fire judgment accumulation condition is not satisfied, the process may proceed to step S11.

Further, when the fire determining unit 86 receives an internal state request command from the disaster prevention receiver 10 during the control operation, the fire determining unit 86 transmits information (indicating N) regarding the number of occurrences of the failure sign counted by the counter at that time to the failure sign. The information is transmitted as a response and used by the disaster prevention receiving panel 10 to determine the reliability of the fire detector 12.

[Disaster prevention receiver]
(Outline of disaster prevention reception board)
FIG. 6 is a block diagram schematically showing the functional configuration of the disaster prevention receiver. As shown in FIG. 6, the disaster prevention reception panel 10 includes a panel control section 34, and the panel control section 34 is a function realized by executing a program, for example, and the hardware includes a CPU, memory, various input/output ports, etc. Use computer circuits etc. equipped with

Transmission units 36a and 36b are provided for the panel control unit 34, and a plurality of fire detectors 12 installed in the upstream tunnel 1a and the downstream tunnel 1b are connected to signal lines 14a and 14b drawn out from the transmission units 36a and 36b, respectively. The machine is connected.

In addition, an alarm unit 38 equipped with a speaker, an alarm indicator light, etc., a display unit 40 equipped with a liquid crystal display, a printer, etc., an operation unit 41 equipped with various switches, etc., and an IG slave station equipment 20 are connected to the panel control unit 34. The modem 42 shown in FIG. An IO unit 43 is provided.

The panel control section 34 is provided with the function of a fire monitoring control section 48 as a function realized by executing a program.

The fire monitoring control unit 48 instructs the transmission units 36a and 36b to repeatedly transmit a call signal including a polling command that sequentially specifies the address of the fire detector 12 via the signal lines 14a and 14b, and the fire detector 12 12, when receiving a call signal matching its own address, returns a response signal such as a fire signal, a sensitivity abnormality sign signal, a sensitivity abnormality sign signal, a contamination sign signal, a stain signal, etc.

In addition, when the fire monitoring control unit 48 determines that there is a fire based on the reception of the fire signal from the fire detector 12, the fire monitoring control unit 48 outputs a fire alarm from the alarm unit 38, and controls interlocking of other equipment via the IO unit 43, such as an alarm. Predetermined fire treatment is performed, including displaying a no-entry warning on the display board equipment 24 and transmitting a fire transfer signal to the remote monitoring and control equipment 32.

In addition, the fire monitoring control unit 48 sends test instruction signals that sequentially specify the addresses of the fire detectors 12 at the startup of the system or at predetermined intervals (for example, once a day, 24-hour cycle). The fire detector 12 performs a sensitivity test and a dirt test, and responds with the results of each test. For example, when a response signal of a sensor failure is received, a sensor failure alarm that specifies the address of the fire detector 12 is issued. Control is performed to notify by an alarm sound from the section 38, display on the display section 40, and printing.

In addition, when the fire monitoring control unit 48 receives a response signal indicating a contamination abnormality obtained from the contamination test of the fire detector 12, the fire monitoring control unit 48 issues a contamination alarm specifying the address of the fire detector, an alarm sound from the alarm unit 38, and an alarm sound from the display unit 40. Controls the display and printing of information.

In addition, when the fire monitoring control unit 48 receives a response signal indicating sensor failure or contamination abnormality obtained from the sensitivity test and contamination test of the fire detector 12, the fire monitoring control unit 48 transmits the IG slave station equipment 20 shown in FIG. 1 from the modem 42. A transfer signal is transmitted to the remote monitoring and control equipment 32 via the remote monitoring control equipment 32, and control is performed to notify a failure alarm or an abnormality alarm.

(Fire judgment control)
When the fire monitoring control unit 48 receives a fire signal from the fire detector 12, it transmits an internal state request command signal specifying the address of the fire detector 12 that sent the fire signal, and counts the value using the counter of the fire detector 12. Obtains failure sign information including information indicating the number of times N failure signs have occurred, and based on this, evaluates the reliability of the fire detector 12 that transmitted the fire signal to determine whether it is reliable or has decreased reliability. do.

The reliability evaluation of the fire detector 12 by the fire monitoring control unit 48 is performed based on, for example, a predetermined threshold value set as a reliability judgment accumulation condition for the number of occurrences N of failure signs of the fire detector 12 acquired and extracted as failure sign information. If the number of times is less than Nref or the threshold number of times Nref, it is determined that the reliability is present, and if the number of times is more than the predetermined threshold number of times Nref or exceeds the threshold number of times Nref, it is determined that the reliability has decreased.

If the fire detector 12 does not transmit a fire signal when it determines a failure sign, for example, the threshold number of times Nref for setting the reliability judgment accumulation condition may be determined by the failure sign judgment by the fire determination unit 86 shown in FIG. It is sufficient to set a value lower than the threshold number of times Nth set as the accumulation condition.

When the fire monitoring control unit 48 determines that the fire detector 12 that transmitted the fire signal is reliable, the fire monitoring control unit 48 transmits a fire recovery command signal to the fire detector 12 to restore it, and then receives the fire signal again. It is determined that there is a fire, and predetermined fire treatment is carried out, including the output of a fire alarm, interlocking control of other equipment, including at least the display of a no-entry warning by the alarm display board equipment 24, and the transmission of a fire transfer signal to the remote monitoring and control equipment 32. conduct.

On the other hand, when the fire monitoring control unit 48 determines that the reliability of the fire detector 12 that has transmitted the fire signal has deteriorated, the fire monitoring control unit 48 detects the fire by transmitting an accumulation condition change command signal (accumulation condition tightening command) The accumulation count threshold for setting the first fire judgment accumulation condition (accumulation condition in step S7 in FIG. 5) of the detector 12 is increased to make the second fire judgment accumulation condition stricter (harder to reach a fire judgment). Specifically, for example, the accumulation frequency threshold value is increased to substantially reduce the sensitivity to fire, and then a restoration command signal is transmitted to restore the system.

In this state, the fire monitoring control unit 48 receives a second fire signal based on the satisfaction of the second fire judgment accumulation condition from the fire detector 12 that transmitted the first fire signal with the changed fire judgment accumulation condition. It is determined that there is a fire when a fire signal is received from an adjacent fire detector 12 that is redundantly monitoring the same detection area as the fire detector 12 that sent the first fire signal. , performs predetermined fire treatment including outputting a fire alarm, interlocking control of other equipment including at least the display of a no-entry warning by the alarm display board equipment 24, and transmitting a fire transfer signal to the remote monitoring and control equipment 32.

In this way, if the fire monitoring control unit 48 determines that the reliability of the fire detector 12 that transmitted the fire signal has decreased, or if the fire detector 12 determines that there is a fire due to a failure sign other than a fire and transmits the fire signal. By strictly changing the fire judgment accumulation conditions of the fire detector, the possibility of transmitting a fire signal again due to unknown non-fire factors after recovery is reduced, and in this case, the adjacent fire detector 12 is not reliable. The fire detector 12, which has been restored after transmitting the first fire signal, and the adjacent fire detector 12a By determining that there is a fire when a fire signal is received from one or both of the above, it is possible to reliably prevent the fire from being determined to be a fire even though it is not a fire and fire treatment is performed.

Further, after determining that the reliability of the fire detector 12 that transmitted the first fire signal has decreased, the fire monitoring control unit 48 makes a fire judgment based on the fire detector 12 and/or the adjacent fire detector 12a. If this is not true, control is performed to transmit a non-fire transfer signal indicating that a non-fire (erroneous) fire signal has been received from the fire detector 12 to the remote monitoring control equipment 32 for notification.

As a result, the person in charge of the management of the remote monitoring and control equipment 32 can know the state in which the reliability of the fire detector 12 has decreased, which could be the cause of a non-fire alarm, and can perform tunnel operations such as strengthening inspections of the fire detector 12. Make it available for management efficiency.

In addition, if the fire monitoring control unit 48 determines that the reliability of the fire detector 12 that transmitted the fire signal has decreased, the accumulation condition is set for the adjacent fire detector 12 that is redundantly monitoring the detection area of the fire detector 12. By transmitting a change command signal (accumulation condition relaxation command) and lowering the accumulation frequency threshold in step S7 in FIG. 5, the first fire judgment accumulation condition is relaxed (to make it easier to reach a fire judgment). It is also possible to change to the fire judgment accumulation condition of 3 to substantially increase the sensitivity to fire.

Specifically, for example, by lowering the accumulation count threshold set as the first fire judgment accumulation condition of the adjacent fire detector 12 and changing it to the third fire judgment accumulation condition, if it is an actual fire, The fire signal from the adjacent fire detector 12a is quickly transmitted, and/or the fire detector 12 that was determined to have decreased reliability after transmitting the first fire signal is restored, and then a second fire signal is promptly transmitted. Fire treatment can be carried out.

In addition, if the fire detector 12 can transmit a fire signal that distinguishes between the right eye and the left eye, for example, if the fire detector 12 redundantly monitors the detection area of the right eye of this fire detector 12 with the left eye, The fire detector 12 may be adjacent to the eye). If it is not possible to distinguish between the right eye and the left eye, the fire detectors 12 on both sides or one of them will be used.

[Control operation of tunnel disaster prevention system]
(Fire detector is reliable)
FIG. 7 is a time chart showing the control operation when the fire detector is determined to be reliable by the disaster prevention receiver.

As shown in FIG. 7, when the fire detector 12 determines that there is a fire in step S21, the process proceeds to step S22 and transmits a fire signal to the disaster prevention receiver 10. When the disaster prevention receiving panel 10 receives the fire signal from the fire detector 12, it transmits an internal status request command signal to the fire detector 12 in step S23, and in response to this, the fire detector 12 counts the value using the counter in step S24. Failure predictor information including information indicating the number of occurrences N of failure predictors is generated and transmitted to the disaster prevention receiver 10.

The disaster prevention receiver 10 that has received the failure sign information from the fire detector 12 evaluates reliability based on the number of failure sign occurrences N extracted from the failure sign information in step S25, and if it is determined that the reliability is present in step S26. Proceeding to step S27, a recovery command signal is sent to the fire detector 12, and recovery is performed in step S28.In step S29, the fire detector 12 determines that there is a fire again, and a fire signal is transmitted in step S30. The disaster prevention receiver 10 that received the signal determines that there is a fire in step S31, and outputs a fire alarm, performs interlocking control of equipment including at least the display of a no-entry warning by the alarm display board equipment 24, and fire notification to the remote monitoring and control equipment 32. Carry out prescribed fire procedures, including sending signals.

(Reduced reliability of fire detector)
FIG. 8 is a time chart showing the control operation when the disaster prevention receiver panel determines that the reliability of the fire detector has decreased.

The processing in steps S41 to S45 in FIG. 8 is the same as the processing in steps S21 to S25 in FIG. In FIG. 8, the reliability is evaluated in step S45 based on the number of occurrences N of failure signs extracted from the failure sign information, and if it is determined in step S46 that the reliability has decreased, the process proceeds to step S47, where it is determined that the reliability has decreased. Fire judgment accumulation conditions for the detection area that is being monitored redundantly for the adjacent fire detector 12 that is redundantly monitoring the detection area corresponding to the fire detection unit that caused the reliability reduction of the fire detector 12 that has been A storage condition change command signal to reduce the accumulation condition change command signal, specifically, a storage condition change command signal to reduce the accumulation count threshold value which is the fire judgment accumulation condition in step S7 of FIG. an accumulation condition change command signal for changing the first fire judgment accumulation condition corresponding to the fire detection section that caused the transmission of the fire signal to the strict second fire judgment accumulation condition, to the fire detector 12 that transmitted the fire signal; Specifically, it transmits an accumulation condition change command signal that increases the accumulation frequency threshold for fire determination.

The adjacent fire detectors 12 (next to both sides or one side) that have received the accumulation condition change command signal from the disaster prevention receiver 10 relax the fire judgment accumulation condition by lowering the accumulation frequency threshold in step S48. The fire sensitivity is substantially increased, and if it is an actual fire, it is immediately determined to be a fire in step S49, and a fire signal is transmitted in step S50.

Further, the fire detector 12 that has received the accumulation condition change command signal to increase the accumulation frequency threshold from the disaster prevention receiver 10 increases the accumulation frequency threshold in step S51 to substantially lower the fire sensitivity. Subsequently, the disaster prevention receiver 10 transmits a recovery command signal to the fire detector 12 that sent the first fire signal in step S52, and the fire detector 12 that receives this signal temporarily recovers in step S53. At this time, if the actual fire continues, the fire detector 12 with lowered sensitivity also determines that there is a fire again in step S54 and transmits the fire signal again in step S55.

In step S57, the disaster prevention receiver 10 receives the second fire signal from the fire detector 12 that transmitted the first fire signal in step S56 before a predetermined time elapses, and in accordance with the strict fire judgment accumulation conditions. When one or both of the changed fire signal from the adjacent fire detector 12 (if there are two adjacent fire detectors, one or both of them) is received, the process proceeds to step S58, and the output of a fire alarm, or at least an alarm display. Predetermined fire treatment is performed, including interlocking control of the equipment, including display of a no-entry warning by the board equipment 24, and transmission of a fire transfer signal to the remote monitoring and control equipment 32. Here, the predetermined time in step S57 is a time corresponding to the accumulation time in consideration of the accumulation count threshold increased in step S51.

In addition, in a system that can distinguish between the right eye and the left eye, the one eye that is monitoring the detection area of the eye where a fire has occurred is redundantly monitored. All you have to do is put out the fire when you get a signal.

On the other hand, in step S57, it is determined whether one or both of the second fire signal from the fire detector 12 that transmitted the first fire signal and the fire signal from the adjacent fire detector 12 are received. If the predetermined time has elapsed in step S57, the process proceeds to step S59, and a non-fire transfer signal indicating that a non-fire fire signal has been received from the fire detector 12 is sent to the remote monitoring and control equipment 32 to notify it. .

[Embodiment in which reliability is determined using a fire detector]
In the above embodiment, when the disaster prevention receiver 10 receives a fire signal, it acquires failure sign information including information indicating the number of failure signs to occur from the fire detector 12 that transmitted the fire signal, Although the reliability of the fire detector 12 that transmitted the fire signal is evaluated to determine whether it is reliable or has decreased reliability, in another embodiment, the reliability is evaluated based on the number of occurrences of failure signs on the fire detector 12 side. It is also possible to evaluate whether the reliability is high or the reliability is low.

That is, the fire determination unit 86 of the fire detector 12 shown in FIG. 4 calculates the number of occurrences N of failure signs in step S11 as shown in the control operation of FIG. , when an internal state request command signal is received from the disaster prevention receiver 10, the number N of occurrences of the failure sign sought at that time is compared with a predetermined threshold number Nref set as a reliability judgment accumulation condition, and the predetermined threshold number Nref is determined. If it is less than or equal to the threshold number of times Nref, it is determined that there is reliability, and if it is more than or equal to the predetermined threshold number of times Nref or exceeds the threshold number of times Nref, it is determined that the reliability has decreased, and information indicating the result of this reliability judgment is included. The reliability information is transmitted to the disaster prevention receiving panel 10.

The disaster prevention receiver 10 determines the reliability determination result from the reliability information acquired from the fire detector 12 in the reliability determination process in step S25 of FIG. 7 and the reliability determination process in step S45 of FIG. All that is required is extraction, and the rest is the same as the embodiment described above. By making the reliability judgment on the fire detector 12 side in this way, the processing load on the disaster prevention receiving panel 10 side can be reduced.

(Control operation of disaster prevention receiving panel by detecting signs of failure of fire detector)
FIG. 9 is a time chart showing the control operation of the disaster prevention receiver when a failure sign is detected by the fire detector and determined to be a failure sign. Note that even if the fire detector determines that it is a sign of its own failure, it does not stop transmitting a fire signal as a failure sign process, but it transmits a fire signal when it determines that there is a fire.

As shown in FIG. 9, when the number of occurrences N of failure signs in the fire detector 12 reaches a predetermined threshold value Nth in step S61 and it is determined (determined) to be a failure sign, a failure sign signal is sent to the disaster prevention receiving board 10 in step S62. If a failure sign process is performed, a predetermined failure sign process is performed in step S62a, but as described above, in order to explain the subsequent control, an example in which stopping the transmission of fire signals is not performed as a failure sign process is used. do. The disaster prevention receiver 10 that has received the failure sign signal from the fire detector 12 notifies the fire detector 12 that has become a failure sign by an alarm display on a display in step S63, and sends a failure sign to the remote monitoring and control equipment 32 in step S64. Send a relocation signal to make an announcement.

In this state, if the fire detector 12 determines that there is a fire in step S65 and transmits a fire signal in step S66, the disaster prevention receiver 10 determines in step S67 whether or not the fire detector 12 has detected a failure sign. If it is not the fire detector 12 for which a sign of failure has been detected, the process proceeds to step S68, and the interlocking control of other equipment including the output of a fire alarm, the display of a no-entry warning by the alarm display board equipment 24, and the remote monitoring control equipment 32 are performed. Carry out predetermined fire treatment including sending a fire alarm signal.

On the other hand, if it is determined in step S67 that the second fire signal is transmitted from the fire detector 12 in which a failure sign has been detected, the process proceeds to step S69 and is determined to be a non-fire signal. , without performing fire processing, for example, notifying the reception of a non-fire alarm, then proceeding to step S70, and indicating malfunction of the fire detector 12 to the remote monitoring and control equipment 32 as malfunction information of the fire detector 12. Send a non-fire transfer signal to notify.

Note that if the fire determination unit 86 of the fire detector 12 has stopped transmitting the fire signal as a failure sign process, the processes after step S65 are not performed.

[Embodiment for determining reliability on a tunnel-by-tunnel or section-by-section basis]
In the above embodiment, reliability is determined for each fire detector 12, but in other embodiments, a plurality of fire detectors may be grouped for each tunnel, each signal system, or each predetermined section of a tunnel. Based on the 12 failure sign information, the reliability may be evaluated for each tunnel, each signal system, or each section to determine whether the system is reliable or has decreased reliability.

Therefore, when determining reliability for each section of a tunnel, for example, when the disaster prevention receiving board 10 receives a fire signal from a fire detector 12, it is grouped by the section to which the fire detector 12 that transmitted the fire signal belongs. The internal information request command signal is sent to the plurality of fire detectors 12 to receive the respective failure sign information, and from this information, the number of occurrences N1, N2,...Nn of failure signs is obtained, and the failure sign information is obtained. The average number of occurrences N1, N2, . . . If the threshold number of times Nref or exceeds the threshold number of times Nref, it is determined that the reliability has decreased, and the same control operation as in the above embodiment is performed depending on the reliability determination result.

This embodiment can evaluate the reliability of the fire detector 12 based on differences in environmental factors such as temperature, humidity, and electrical noise specific to each section of the tunnel, and determine whether the fire detector 12 is reliable or has decreased reliability. . This judgment result and the information indicating the above Nref are temporarily held as reliability information.

In addition, when determining reliability on a tunnel-by-tunnel basis, when receiving a fire signal from a fire detector 12, the disaster prevention receiver 10 sends an internal information request command to all fire detectors 12 installed in the tunnel. is transmitted, and the number of occurrences of failure signs N1, N2, ... Nn is obtained as all the failure sign information, and the average number of times Nave is calculated. If it is determined that there is reliability, and the number of times exceeds a predetermined threshold value Nref or exceeds the threshold value Nref, it is determined that the reliability has decreased, and the same control operation as in the above embodiment is performed depending on the reliability determination result.

Here, in the embodiments of FIGS. 7 and 8 and the present embodiment in which reliability information is generated for each tunnel, each signal system, and each section, when the disaster prevention receiving board 10 receives a fire signal from the fire detector 12, In this system, failure sign information is acquired from the relevant fire detector 12 or fire detectors in tunnels, signal systems, and sections, but the failure sign information is acquired prior to receiving the fire signal, and based on this, the fire signal is detected. It is also possible to perform various processes related to the reception of the data.

Furthermore, when determining the reliability for each system, the average number of occurrences of failure signs of the fire detector 12 for each signal line 14a, 14b is similarly calculated, and the reliability is determined based on this. Note that the failure predictor information is not limited to the number of occurrences of failure predictors, but may also be a moving average number of occurrences, a frequency of occurrence of failure predictors, an occurrence rate over a predetermined period, or the like.

[Other embodiments of determining failure signs]
(Determination of failure signs associated with sensitivity test)
FIG. 10 is an explanatory diagram showing the peak level of a light reception signal and the number of occurrences of a failure sign when an internal test light source is driven in a sensitivity test of a fire detector.

The sensitivity test unit 88 provided in the detector control unit 54 of the fire detector 12 shown in FIG. If a fire occurs, the test light emitting drive unit 76 is activated to cause the internal test light sources 78R, 80R, 82R, 78L, 80L, and 82L to blink in sequence for a predetermined period (for example, 1 second) at 2 Hz, for example, to prevent a fire. A sensitivity test is performed by injecting flame pseudo light (test light) corresponding to fire flame into the detection units 60R and 60L.

The sensitivity test performed by the sensitivity test section 88 has the same contents as already explained with reference to FIG. In addition, the sensitivity testing section 88 of the present embodiment receives a flame reception signal E1R, a first non-flame reception signal E2R, a second non-flame reception signal E3R, and , the peak level of each light reception signal is detected for each of the flame reception signal E1L, the first non-flame reception signal E2L, and the second non-flame reception signal E3L during the sensitivity test output from the fire detection unit 60L. As shown by the black circle in 10(A), for example, the peak level detected once a day is outside the predetermined normal range 94 based on the initial value 92 of the peak level detected in the state without deterioration at the time of shipment from the factory. However, if the predetermined failure threshold 96 or below or the failure threshold 96 is not satisfied and the failure judgment conditions are not satisfied, that is, if it is within the failure sign range 98, it is determined as a failure sign, and as shown in FIG. 10(B). , the number of occurrences N of failure signs is controlled by a counter.

Here, the normal range 94 of the light reception signal is a range centered on the initial value 92 and sandwiched between, for example, an upper limit value 94a and a lower limit value 94b, and is, for example, ±10% of the initial value 92. Further, the failure threshold value 96 is set to a value of about 50% of the initial value 92, for example.

The failure sign range is, for example, the range from the upper limit 94a of the normal range 94 to 50% of the initial value 92 added to the initial value 92, that is, exceeding (upper limit 94a) {(initial value 92) + (initial value 50% of 92)} The following range may be added and determined to be a sign of failure.

On the other hand, the fire determination unit 86 compares the number of occurrences N of the failure sign calculated by the counter of the sensitivity test unit 88 with a predetermined threshold number Nth set as the failure sign judgment accumulation condition, and compares the number N of occurrences of the failure sign When the predetermined failure sign is greater than or equal to the predetermined threshold Nth or exceeds the predetermined threshold Nth and satisfies the failure sign determination accumulation condition, it is determined (confirmed) to be a failure sign, and a failure sign signal is transmitted to the disaster prevention receiver 10, and then the predetermined failure sign is detected. Perform processing. The failure sign processing by the fire determination unit 86 is, for example, processing to stop transmitting a fire signal.

Further, when the fire determination unit 86 receives the internal state request command signal from the disaster prevention receiver 10, it performs control to transmit predictive failure information including information indicating the number N of occurrences of the failure sign obtained at that time, It is used to extract the number N of occurrences of failure signs in the disaster prevention receiver 10 and evaluate the reliability of the fire detector 12 that transmitted the fire signal based on this to determine whether the reliability is present or whether the reliability has decreased.

Note that the number of occurrences N of failure signs counted by the counter is reset, for example, every predetermined period, or when a predetermined period has elapsed since the failure signs were counted. The number N of failure sign occurrences before reset may be stored as a failure sign information history.

(Fire detector sensitivity test operation)
FIG. 11 is a flowchart showing a sensitivity test of a fire detector that involves determination of signs of failure, and is a control operation by the sensitivity test section 88 and fire determination section 86 of the fire detector 12 shown in FIG.

As shown in FIG. 11, for example, taking the fire detection section 60R of FIG. The process proceeds to step S72, where it instructs the test light emission drive section 76 to blink the internal test light source 78R at 2 Hz for a predetermined period (for example, 1 second) to lighten the sensor. A flame dummy light (test light) corresponding to a fire flame is incident on the section 64.

Subsequently, the sensitivity testing unit 88 proceeds to step S73, detects the peak level of the flame reception signal (light reception signal) E1R due to the test light output from the amplification processing unit 66, and in step S74, detects the peak level of the flame reception signal (light reception signal) E1R as shown in FIG. 10(A). It is determined whether or not it is within the normal range 94. If it is within the normal range 94, the process proceeds to step S75, and the peak level of the received light signal, for example, is determined based on the initial value (reference received light value) 92 stored during the initial sensitivity test at the time of factory shipment. A detection sensitivity coefficient is calculated by dividing, and in step S77, a correction coefficient for the light reception signal is calculated and stored as the reciprocal of the detection sensitivity coefficient, and is used to correct the light reception signal level.

Subsequently, the sensitivity test unit 88 proceeds to step S77, and repeats the processing from step S71 until the detection sensitivity coefficient calculated in step S75 reaches a predetermined sensitivity correction limit threshold (for example, 0.5). Note that the correction limit in step S75 may be set when the peak level is equal to or less than the failure threshold, similarly to step S81.

If the sensitivity test unit 88 determines in step S77 that the detection sensitivity coefficient has reached the sensitivity correction limit threshold, in step S78 the sensitivity test unit 88 continues the process from step S71 until reaching a predetermined sensitivity abnormality determination accumulation condition, for example, a predetermined accumulation number threshold. The process is repeated, and when the sensitivity abnormality determination accumulation condition in step S78 is satisfied, a sensitivity abnormality signal is transmitted to the disaster prevention receiving panel 10 in step S79.

Subsequently, the fire determining unit 86 receives the determination of sensitivity abnormality by the sensitivity testing unit 88 and performs a predetermined sensitivity abnormality process in step S80. This sensitivity abnormality processing is performed by, for example, the fire judgment unit 8 The fire sensitivity may be substantially lowered by increasing the number of accumulation thresholds used to set the fire judgment accumulation conditions, or the transmission of fire signals may be stopped.

On the other hand, if the sensitivity test section 88 determines in step S74 that the peak level of the light reception signal E1R during the test is outside the normal range 94, the process proceeds to step S81, and if the peak level is not lower than the failure threshold 96 or does not fall below the failure threshold That is, if it is within the failure sign range 98 shown in FIG. Note that the determination of a sign of failure in step S81 is not limited to the peak level of the light reception signal, and may be performed based on, for example, an integral value or an average level.

Subsequently, the fire determining unit 86, which has received the notification of the failure sign determination result from the sensitivity testing unit 88, increments a counter N for counting the number of failure sign occurrences by 1 in step S82, and in step S83, the fire judgment unit 86 increments the counter N for counting the number of failure sign occurrences. If the number N of occurrences is less than or equal to the threshold number Nth set as a predetermined failure sign determination accumulation condition, the process from step S71 is repeated.

By repeatedly counting the number N of occurrences of failure signs in this manner, the fire determination unit 86 determines whether the failure sign determination accumulation condition is satisfied in step S83 when the number N of failure sign occurrences exceeds a predetermined threshold number of times Nth. It is determined (confirmed) that it is a failure sign, and the process proceeds to step S85, where a failure sign signal is transmitted to the disaster prevention receiver 10 for notification, and then, in step S86, a predetermined failure sign process is performed.

This failure sign processing, for example, increases the accumulation count threshold value set as the fire judgment accumulation condition by the fire judgment unit 86 to tighten the fire judgment accumulation condition and substantially lower the fire sensitivity. Furthermore, even if the fire determining unit 86 determines that there is a fire after that, there is a high possibility that the fire will be determined incorrectly due to a malfunction, so the transmission of the fire signal will be stopped and processing will be performed to suppress the occurrence of non-fire alarms. You can also do it.

Further, upon receiving the internal status request command from the disaster prevention receiving board 10, the fire determining unit 86 responds by transmitting failure sign information including information indicating the number of failure sign occurrences N counted by the counter at that time, and receives the disaster prevention reception. The panel 10 extracts the number of occurrences of a failure sign from the acquired failure sign information of the fire detector 12, evaluates the reliability, and determines whether reliability is present or reliability is decreased.

On the other hand, if the sensitivity test section 88 determines in step S81 that the peak level of the light reception signal has decreased to the failure threshold 96 or less, the process proceeds to step S78, and the sensitivity testing section 88 advances to step S78 to reach the predetermined accumulation count threshold set as the sensitivity abnormality determination accumulation condition. The processing from step S71 is repeated until the sensitivity abnormality determination accumulation condition of step S78 is satisfied, a sensitivity abnormality signal is transmitted to the disaster prevention receiver 10 in step S79, and then a predetermined sensitivity abnormality process is performed in step S80.

Furthermore, although this embodiment takes as an example a case where the number of occurrences of a failure sign is determined through a sensitivity test periodically performed on a fire detector, the present invention is not limited to this, and the test instruction operation from the disaster prevention receiver 10 can be performed at any timing. It also includes tests performed on internal test light sources other than sensitivity tests. The same can be done for the left eye fire detection section 60L. Further, the same process can be performed for the first non-flame light reception signals E2R, E2L and the second non-flame light reception signals E3R, E3L during the test.

[Judgment of signs of failure by fire judgment section and sensitivity testing section]
As another embodiment of the fire detector 12 according to the present invention, a combination of the failure sign determination by the fire determining section 86 shown in the flowchart of FIG. 5 and the failure sign determination by the sensitivity testing section 88 shown in the flowchart of FIG. , is configured to cumulatively count the number of occurrences N of failure signs judged by each of them, and receives failure sign information including information indicating the cumulative number of occurrences of failure signs from the fire detector 12 that transmitted the fire signal. Reliability is evaluated based on the cumulative number of occurrences of failure signs acquired and extracted by the panel 10, and it is determined whether reliability is present or reliability is decreased.

Furthermore, when the cumulative number of occurrences of a failure sign exceeds a predetermined threshold number Nth and satisfies the failure sign judgment accumulation condition, the failure sign is determined to be a failure sign and a failure sign signal is sent to the disaster prevention receiver 10. A notification is sent and a predetermined failure sign process is subsequently performed.

[Modification of the present invention]
(fire detector)
Although a three-wavelength fire detector is used as an example, other methods may also be used.For example, infrared rays in the 4.5 μm band, which is the resonant radiation band of CO2, and the shorter wavelength band, for example, around 5.0 μm. It may be a two-wavelength flame detector that detects energy and determines the presence or absence of flame based on the relative ratio of each received light signal in these two wavelength bands.

(Change of storage conditions)
In addition, changing the fire judgment accumulation conditions of the fire detector 12 in the above embodiment, for example, changing the fire judgment accumulation frequency threshold, makes the failure sign judgment conditions stricter as the fire detector 12 itself performs failure sign processing (fire sensitivity In the case of increasing the accumulation count threshold (step S14 in FIG. 5) in order to lower the number of fires (reducing the sensitivity of There is a case where the accumulation count threshold is increased (step S51 in FIG. 8) in order to increase the number of accumulation times (step S51 in FIG. 8), and if both are carried out at the same time, the total accumulation time becomes longer than necessary and the detection of a fire is not delayed. Change it accordingly.

(P-type tunnel disaster prevention system)
Although the above embodiment has shown a so-called R-type tunnel disaster prevention system that monitors fires by connecting a fire detector with an address set to a signal line drawn out from a disaster prevention receiver, the present invention is not limited to this. The same applies to a so-called P-type tunnel disaster prevention system in which signal lines are drawn out for each fire detector from a disaster prevention receiver and a fire detector is connected to each signal line.

In a general P-type tunnel disaster prevention system, it is not possible to communicate information such as the number of occurrences of specific warning signs between the disaster prevention reception board and the fire detector, so the disaster prevention reception board shown in the above embodiment The fire detector has a function that evaluates the reliability of the fire detector and determines whether it is reliable or has decreased reliability. By doing so, or by providing a dedicated line for reliability degradation signals, reliability information is transmitted to the disaster prevention receiving board to notify the disaster prevention receiver of the reliability degradation.

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

1a: Up line tunnel 1b: Down line tunnel 10: Disaster prevention reception board 12: Fire detectors 14a, 14b: Signal line 16: Fire pump equipment 18: Cooling pump equipment 20: IG slave station equipment 22: Ventilation equipment 24: Alarm display Board equipment 26: Radio rebroadcasting equipment 28: Television monitoring equipment 30: Lighting equipment 32: Remote monitoring and control equipment 34: Panel control sections 36a, 36b: Transmission section 48: Fire monitoring and control section 50R, 50L: Translucent window 52R, 52L: Translucent window for test light source 54: Detector control section 56: Transmission section 58: Power supply section 60R, 60L: Fire detection section 64, 68, 72: Sensor section 66, 70, 74: Amplification processing section 76: Test Light emission drive section 78R, 78L, 80R, 80L, 82R, 82L: Internal test light source 84R, 84L: External test light source 86: Fire judgment section 88: Sensitivity test section 90: Dirt test section

Claims (9)

In a fire detector that connects to a disaster prevention receiver and monitors fires in the detection area,
Determine failure signs based on predetermined conditions, judge own reliability based on the number of occurrences of failure signs, which is the number of determined failure signs,
A fire detector characterized in that when the number of occurrences of the failure sign reaches a predetermined number of times of 2 or more, it is determined that the reliability of the fire detector has decreased.
In a fire detector that connects to a disaster prevention receiver and monitors fires in the detection area,
Fires are judged using multiple fire judgment stages.
If a fire is determined to be a fire in at least one of the plurality of fire determination stages, but a fire is not determined to be a fire in any of the remaining fire determination stages, it is determined to be a failure sign, and the determined failure sign is determined to be a failure sign. Determine your own reliability based on the number of occurrences of failure signs, which is the number of times,
A fire detector characterized in that the fire detector determines that its own reliability has decreased when the number of occurrences of the failure sign satisfies a predetermined reliability judgment accumulation condition.
In a fire detector that connects to a disaster prevention receiver and monitors fires in the detection area,
We are conducting a test to determine the failure of the fire detection unit based on the light reception signal when driving the test light source.
If the level of the received light signal in the test does not satisfy the predetermined normality judgment condition and the predetermined failure judgment condition, it is judged as a failure sign, and the self-control is determined based on the number of occurrences of the failure sign, which is the number of judged failure signs. determine the reliability of
A fire detector characterized in that the fire detector determines that its own reliability has decreased when the number of occurrences of the failure sign satisfies a predetermined reliability judgment accumulation condition.
In a fire detector that connects to a disaster prevention receiver and monitors fires in the detection area,
A fire is determined by a plurality of fire determination stages, and a fire is determined to be a fire in at least one of the plurality of fire determination stages, but a fire is not determined to be a fire in any of the remaining fire determination stages. If this occurs, it is determined that this is the first sign of failure,
A test is being conducted to determine the failure of the fire detection unit based on the light reception signal when the test light source is driven, and the level of the light reception signal from the test does not satisfy the predetermined normality judgment condition and the predetermined failure judgment condition. If this occurs, it is determined to be a sign of a second failure.
Self-confidence based on either or both of the number of occurrences of the first failure sign, which is the number of times the first failure sign has been determined, and the number of occurrences of the second failure sign, which is the number of times the second failure sign has been determined. determine gender,
When one or both of the number of occurrences of the first failure sign and the number of occurrences of the second failure sign satisfy a predetermined reliability judgment accumulation condition, it is determined that the reliability of the device has decreased. fire detector.
In the fire detector according to any one of claims 2 to 4,
The fire detector is characterized in that the reliability judgment accumulation condition for judging a decrease in its own reliability is a condition that is satisfied when the number of occurrences of failure signs reaches a predetermined number of times of 2 or more.
In the fire detector according to any one of claims 1 to 5,
A fire detector characterized in that, when determining that its own reliability has decreased, it transmits a reliability decrease signal that includes information on the determined decrease in its own reliability.
In the fire detector according to any one of claims 1 to 6,
A fire detector is characterized in that it stops transmitting a fire signal when it determines that a fire has occurred when it determines that its own reliability has decreased.
In the fire detector according to any one of claims 1 to 7,
A fire detector characterized by determining its own reliability in multiple stages depending on the degree of reliability.
In a disaster prevention system that monitors fires in a detection area by connecting the fire detector according to any one of claims 1 to 4 to a disaster prevention receiving board,
When the fire detector receives a reliability reduction signal transmitted by the fire detector after determining that its own reliability has deteriorated, the disaster prevention receiver sets stricter conditions for determining that there is a fire in the fire detector. When a fire signal that is sent when a fire is determined from at least one of the adjacent fire detectors that redundantly monitors the fire detector and the detection area of the fire detector after being changed and restored, A disaster prevention system characterized by performing the predetermined fire treatment.

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