JP2017021730A - Tunnel disaster prevention system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable unnecessary suspension of traffic through a tunnel to be avoided by surely preventing erroneous fire determination due to influence of transient noise without impairing fire determination against an actual fire.SOLUTION: A tunnel disaster prevention system is provided that has a disaster prevention reception panel to which a plurality of fire detectors 16 installed in a tunnel are connected and that monitors them. The fire detectors 16 transmit fire pulse signals at a predetermined interval when they detect a fire. The disaster prevention panel receives fire pulse signals transmitted from the fire detectors 16 by a counter part 60 and counts the number of fire pulses. If the number of pulses counted by the counter part 60 reaches a predetermined threshold pulse number within a predetermined fire determination time period, a fire determination part 62 determines that there is a fire.SELECTED DRAWING: Figure 2

Description

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

  Conventionally, emergency facilities have been installed in tunnels for exclusive use of automobiles and the like in order to protect people and vehicles from fire accidents that occur in the tunnel.

  Such emergency facilities are equipped with fire detectors, manual notification devices, emergency telephones for fire monitoring and reporting, fire hydrant devices for fire extinguishing and fire spread prevention, and tunnel enclosures. In order to protect against fire, a water spray that sprays water for fire extinguishing from the water spray head is installed, and a disaster prevention system is built by monitoring and controlling the terminal equipment of these emergency facilities. .

  A tunnel disaster prevention system composed of a disaster prevention receiving board and terminal equipment is roughly divided into an R type transmission system and a P type direct transmission system. The R-type transmission method enables individual management in which terminal devices such as fire detectors whose addresses are set on the transmission line are connected, and detection and control are performed for each terminal device by transmission control. In the P-type direct transmission system, a plurality of terminal devices that enter the same section are connected to a signal line drawn out for each partition according to the type of the terminal device, and detection and control are performed for each signal line.

  As a tunnel disaster prevention system, considering the merits and demerits of the R type transmission method and the P type direct delivery method, the tunnel length, the traffic volume of the vehicle, etc., the tunnel disaster prevention system of the R type transmission method or the P type direct delivery method will be constructed. I have to.

  In the case of a tunnel disaster prevention system using the P-type direct delivery system, the fire detector installed in the tunnel is equipped with two sets of fire detectors that independently monitor the fire with a range of 25 meters or 50 meters on both sides as a detection area. Divide the tunnel into multiple sections according to the detector installation interval, and connect the fire detection unit that monitors the same section of the fire detector located at both ends of the section to the signal line drawn out from the disaster prevention reception board in units of sections And fire is monitored for each signal line. When the fire detector detects a fire, it outputs a fire pulse signal at predetermined time intervals.

  The conventional fire judgment by the disaster prevention receiving board of P-type direct transmission system is such that when a fire pulse signal is received from a fire detector at a predetermined time interval, the first pulse is notified to the outside as a fire warning signal. When the second pulse is received, it is determined that the fire detector is activated, the fire detector is temporarily restored after a predetermined delay time, and a fire is received when a fire pulse is received again from the fire detector within the predetermined time after recovery. If a fire pulse is not received again within a predetermined time, it is treated as a non-fire.

  When the fire is judged by the disaster prevention monitoring panel, in addition to the fire alarm output and printing output of the panel itself, the fire extinguishing pump equipment, the IG slave station equipment connected to the remote management equipment, the ventilation equipment, the alarm display board equipment Control other equipment such as radio re-broadcasting equipment, TV monitoring equipment, lighting equipment.

Japanese Patent Laid-Open No. 2002-246962 JP-A-11-128381

  However, in such a conventional P-type direct-sending tunnel disaster prevention system, a simulated fire pulse signal is sent to the disaster prevention reception panel due to the effects of transient noise such as lightning and radio. In some cases, fires are judged by the disaster prevention reception board, fire treatment is performed, and other facilities are interlocked and the tunnel is often closed.

  The present invention provides a tunnel disaster prevention system that can reliably prevent fire judgment errors due to the effects of transient noise and avoid unnecessary tunnel closure without impairing fire judgment for an actual fire. With the goal.

(Tunnel disaster prevention system)
The present invention is a tunnel disaster prevention system for monitoring and connecting a plurality of fire detectors installed in a tunnel to a disaster prevention receiving board,
The fire detector has a control unit that transmits a fire pulse signal at predetermined time intervals when a fire is detected,
Disaster prevention reception board
A counter unit that receives the fire pulse signal transmitted from the fire detector and counts the number of pulses;
A fire determination unit that determines a fire when the number of counted pulses by the counter unit reaches a predetermined threshold pulse number within a predetermined fire determination time;
It is provided with.

(Delay time setting and recovery operation)
When the fire judgment unit of the disaster prevention reception panel receives the second pulse of the fire pulse signal or a predetermined pulse after that, it determines that the fire detector is activated and sets a predetermined delay time. Then, the fire detector is restored, and when the number of counted pulses reaches a predetermined threshold pulse number after the restoration, a fire is judged.

(Fire judgment following non-fire judgment)
The fire judgment part of the disaster prevention reception board changes the fire judgment time to a second fire judgment time shorter than that when the number of pulses counted by the counter part does not reach the threshold number of pulses within the fire judgment time. At the same time, the threshold pulse number is changed to a smaller second threshold pulse number, and it is determined that a fire has occurred when the count pulse number of the fire pulse signal by the counter unit reaches the second threshold pulse number within the second fire determination time. .

(Fire judgment by multiple fire detectors installed in the same section)
A plurality of fire detectors are provided for each section obtained by dividing the tunnel at a predetermined interval.
The counter unit of the disaster prevention reception board receives fire pulse signals transmitted at predetermined time intervals from each of a plurality of fire detectors provided in the same section in the tunnel, and counts the number of pulses.
The fire judgment unit of the disaster prevention reception board sets a predetermined delay time when the second pulse of the fire pulse signal transmitted from each of the plurality of fire detectors provided in the same section or a predetermined pulse thereafter is received. When the delay time elapses, control is performed to restore the fire detector, and after the restoration, if the number of fire pulses reaches a predetermined threshold within the fire judgment time, it is judged as a fire,
The control units of multiple fire detectors installed in the same section set different fire monitoring start times when receiving a recovery control from the disaster prevention receiver while transmitting a fire pulse signal. Resumes transmission of fire pulse signals after a lapse.

(Set fire monitoring disclosure time using random numbers)
The control unit of the fire detector sets the fire monitoring start time based on a random number when receiving the recovery control by the disaster prevention reception board.

(Fire judgment time)
The fire judgment time set by the fire judgment unit of the disaster prevention reception board is set based on the time for continuously receiving fire pulse signals corresponding to the threshold pulse number.

(Basic effect)
The present invention provides a disaster prevention system for monitoring a fire prevention receiver by connecting a plurality of fire detectors installed in a tunnel to a disaster prevention reception board. When a fire is detected, the fire detector is at predetermined time intervals. The fire prevention signal receiving panel is equipped with a control unit that transmits a fire pulse signal, the counter unit that receives the fire pulse signal transmitted from the fire detector and counts the number of pulses, and the counter unit counts a predetermined number of fires. Because it has a fire judgment unit that judges that a fire will occur when a certain number of threshold pulses are reached within a certain time, the disaster prevention reception panel is not a real fire due to the effects of transient noise such as lightning strikes and radio. Even if a pseudo fire pulse signal is input and counted, a fire is judged unless the count pulse number due to noise reaches a predetermined threshold pulse number, for example, 10 pulses within a predetermined fire determination time. Not Rukoto, erroneous fire determination by transient noise reliably prevented, enabling prevent unnecessary tunnel by interlocking of other facilities closures in advance.

(Effects of delay time setting and recovery operation)
In addition, the fire detection unit of the disaster prevention reception panel determines that the fire detector is activated when the second pulse of the fire pulse signal or a predetermined pulse thereafter is received, sets a predetermined delay time, and the delay time has elapsed. Since the fire detector is restored at the time when the number of counted pulses reaches the predetermined threshold pulse number within the fire judgment time after the restoration, it is determined that a fire has occurred. In the middle of arriving, the fire detector is temporarily restored, and the fire pulse signal is received from the fire detector and counted again. Make it possible.

(Effect of fire judgment following non-fire judgment)
In addition, the fire determination unit of the disaster prevention reception panel determines that the fire determination time is shorter than the second fire determination time when the count pulse number by the counter unit does not reach the threshold pulse number within the fire determination time and determines that there is no fire. And the threshold pulse number is changed to a second threshold pulse number smaller than that, and when the count pulse number of the fire pulse signal by the counter unit reaches the second threshold pulse number within the second fire judgment time, If the fire detector suspends the continuous transmission of the fire pulse signal temporarily and determines that it is non-fire, and then resumes the continuous transmission of the fire pulse signal even though it is an actual fire, After judging a fire, it is possible to judge a fire quickly in a shorter time than usual.

(Effect of fire judgment by multiple fire detectors installed in the same section)
In addition, a plurality of fire detectors are provided for each section obtained by dividing the tunnel at predetermined intervals, and the counter unit of the disaster prevention reception panel is set at a predetermined time interval from each of the plurality of fire detectors provided in the same section in the tunnel. The fire judgment signal of the disaster prevention reception panel is received by the fire pulse signal transmitted from the fire pulse signal sent from each of the plurality of fire detectors provided in the same section or When a predetermined delay is received after that, a predetermined delay time is set, and when the delay time elapses, control is performed to restore the fire detector, and after the recovery, the number of fire pulses falls within a predetermined threshold within the fire judgment time. If the control unit of multiple fire detectors installed in the same section is subjected to recovery control by the disaster prevention receiver while transmitting a fire pulse signal, they will differ from each other by, for example, random numbers. fire Since the visual start time is set and the transmission of the fire pulse signal is resumed after the fire monitoring start time has elapsed, the fire pulse is detected by detecting the fire in the same compartment with the two fire detectors provided at both ends of the compartment. If both fire pulse signals are duplicated and received by the disaster prevention reception board after the signal is continuously transmitted, the two fire detectors will return the fire pulse signal from the recovery when the recovery control is performed after a predetermined delay time has elapsed. The fire monitoring start time until resuming transmission is set to a different time, and the timing of resuming transmission of the fire pulse signal is different so that the fire pulse signals do not overlap and are separated from the two fire detectors. By counting the fire pulse signals transmitted continuously at the timing, it is possible to shorten the time until the threshold number of pulses is reached and a fire is determined.

Explanatory drawing showing the outline of the tunnel disaster prevention system using the P-type direct delivery system Block diagram showing the outline of the functional configuration of the disaster prevention reception board Block diagram showing outline of functional configuration of fire detector Time chart showing fire judgment control operation by counting fire pulse signals Flow chart showing fire judgment control action by disaster prevention reception board Time chart showing control action to judge fire in a short time after judging non-fire Flow chart showing the control operation of the disaster prevention reception panel that judges fire in a short time after judging it is non-fire Time chart showing the control operation of fire judgment when two fire detectors installed in the same section transmit fire pulse signals sequentially. Time chart showing the control action of receiving fire pulse signals of two fire detectors in the same section redundantly and resolving the fire pulse signals by restarting transmission after recovery to judge fire Flow chart showing the control operation of the fire detector that randomly sets the fire monitoring start time after recovery

[Outline of P type direct delivery tunnel disaster prevention system]
FIG. 1 is an explanatory diagram showing an outline of a tunnel disaster prevention system using a P-type direct delivery system. As shown in FIG. 1, an upstream tunnel 1a and a downstream tunnel 1b are constructed as tunnels for an automobile road.

  Fire detectors 16 are installed, for example, at intervals of 25 meters along the walls in the tunnel longitudinal direction inside the upstream tunnel 1a and the downstream tunnel 1b. The fire detector 16 has two sets of fire detectors, sets a monitoring area on both sides 25 meters, detects a fire from a flame, and continuously outputs a fire pulse signal at predetermined time intervals while detecting a fire. Send.

  Further, the inside of the upstream tunnel 1a and the downstream tunnel 1b is divided into sections A1 to An and sections B1 to Bn every 25 meters determined by the installation interval of the fire detector 16. In addition to the fire detector 16, equipment such as a fire hydrant device and an automatic valve device for water spray equipment are installed in the tunnel, but the illustration is omitted.

  A fire detector installed in the tunnel by drawing out signal lines 12a and 12b for n lines divided into sections A1 to An and sections B1 to Bn from the disaster prevention receiving board 10 to the upstream tunnel 1a and the downstream tunnel 1b. 16 is connected in signal line units.

  In addition to the fire detector 16, fire hydrant device and automatic valve device, the fire emergency pump equipment 24, the IG slave station equipment 26, the ventilation equipment 28, the alarm display board equipment 30, the radio rebroadcasting equipment 32, and the television are used as emergency facilities for the tunnel. Monitoring equipment 34, lighting equipment 36, etc. are provided, and other equipment is connected individually to the disaster prevention receiving board 10 by the P-type signal line 14 except that the IG slave station equipment 26 is connected by a data transmission line. ing.

  Here, the IG slave station facility 26 is a communication facility that connects the disaster prevention receiving board 10 and other facilities to the remote management facility. The ventilation facility 28 is a facility that energizes the air in the tunnel with a high blown air speed by the operation of a jet fan installed on the ceiling side in the tunnel, and causes a flow of arousal in the longitudinal direction of the tunnel.

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

[Disaster prevention receiver]
(Schematic configuration of disaster prevention receiver)
FIG. 2 is a block diagram showing an outline of the functional configuration of the disaster prevention reception board. As shown in FIG. 2, the disaster prevention receiving board 10 includes a control unit 40, and the control unit 40 is a function realized by executing a program, for example, and includes a CPU, a memory, various input / output ports and the like as hardware. Use computer circuit etc.

  For the control unit 40, the number of line receiving units 42 corresponding to the sections A1 to An and sections B1 to Bn of the upstream tunnel 1a and the downstream tunnel 1b are provided, and the fire detector 16 is connected by the signal line 12. ing.

  Here, since the fire detector 16 includes two sets of fire detectors 16a and 16b, the fire detectors 16a and 16b of the fire detector 16 having the sections A1, An, B1, and Bn at both ends of the tunnel as monitoring areas. One of 16b is connected to the corresponding line receiver 42 by the signal line 12, and for the sections A2 to An-1 and sections B2 to Bn-1 between them, two fire detections having a monitoring area in the same section Corresponding fire detection units 16 and a16b of the device 16 are connected to the receiving circuit unit 42 through the same signal line 12.

  Further, a modem for connecting a control unit 40 with an alarm unit 45 including a speaker, an alarm indicator, a printer, a display unit 46 including a liquid crystal display, an operation unit 48 including various switches, and an IG slave station facility 26. 50, and P-type transmission in which ventilation equipment 28, alarm display board equipment 30, radio rebroadcast equipment 32, television monitoring equipment 34, lighting equipment 36 and fire pump equipment 24 are individually connected by P-type signal line 14. A part 52 is provided.

  Further, the control unit 42 is provided with functions of a counter unit 60 and a fire determination unit 62. The counter unit 60 receives the fire pulse signal transmitted from the fire detector 16 and counts the number of pulses N. The fire determination unit 62 determines that a fire has occurred when the count pulse number N by the counter unit 60 reaches a predetermined threshold pulse number Nth within a predetermined fire determination time Ta.

Here, when the time interval T1 of the fire pulse signal output from the fire detector 16 is T1 = 3 seconds, for example, the threshold pulse number Nth is, for example, Nth = 10 pulses. In this case, the fire determination time Ta is Ta = T1. * Nth = (3 seconds) * (10 pulses) = Set to a time obtained by adding a desired margin time to 30 seconds. The fire judgment time Ta is a time that does not exceed the maximum fire judgment time required for the tunnel disaster prevention system.

  More specifically, when the first pulse of the fire pulse signal is received, the fire determination unit 62 instructs the modem 50 to output a fire notice signal to the IG slave station equipment 26, and then continues. When the second pulse of the fire pulse signal is received, it is determined that the fire detector 16 is activated, a fire warning warning is displayed and printed out, and a predetermined delay time Tb is set and the delay time Tb has elapsed. At that time, the fire detector 16 is restored, and after the restoration, the fire pulse 16 that the fire detector 16 resumes transmitting has reached the predetermined threshold pulse number Nth within the fire judgment time Ta by the fire pulse signal counter 60. In case of fire.

[Fire detector]
FIG. 3 is a block diagram showing an outline of the functional configuration of the fire detector. As shown in FIG. 3, the fire detector 16 includes two sets of fire detection units 16a and 16b. As representative of the fire detection unit 16a, the sensor units 66a and 66b, and the amplification processing units 68a and 68b. The control unit 70 and the pulse transmission unit 72 are provided. Although the fire detection unit 16b has the same configuration, the control unit 70 is provided as a unit common to both, and for example, a microprocessor or the like having a CPU, a memory, various input / output ports and the like are used as hardware.

The fire detector 16a monitors the fire by, for example, two-wavelength flame detection. The sensor unit 66a selectively transmits (passes) radiant energy of 4.4 to 4.5 μm, which is a resonance radiation band of CO ₂ characteristic of flame, by a narrow band optical wavelength bandpass filter, and the radiation sensor receives the radiation. After detecting energy and performing photoelectric conversion, the amplification processing unit 68 a performs predetermined processing such as amplification, processes the received light signal corresponding to the amount of energy, and outputs it to the control unit 70.

The sensor unit 66b selectively transmits (passes) the radiant energy in the vicinity of 5.1 μm, which is out of 4.4 to 4.5 μm, which is the resonance radiation band of CO ₂ unique to the flame, using a narrow band optical wavelength bandpass filter. Then, after detecting the radiation energy by the light receiving sensor and performing photoelectric conversion, the amplification processing unit 68b performs predetermined processing such as amplification, processes the light reception signal corresponding to the energy amount, and outputs it to the control unit 70.

  The control unit 70 takes the relative ratio of the received light signal levels output from the amplification processing units 68a and 68b and compares it with a predetermined threshold value to determine the presence or absence of a flame. The pulse transmission unit 72 is instructed to continuously transmit a fire pulse signal having a predetermined pulse width T2 at a predetermined time interval T1.

  By determining such a flame, an infrared radiator other than the flame, for example, a high-temperature radiator such as sunlight (6000 ° C.), a relatively low-temperature radiator of about 300 ° C., a low-temperature radiator such as a human body, etc. And flame can be distinguished.

[Fire judgment by counting fire pulse signals]
FIG. 4 is a time chart showing the control operation of fire judgment by counting the fire pulse signal, FIG. 4 (A) shows the fire pulse signal, FIG. 4 (B) shows the counting operation of the counter, and FIG. FIG. 4D shows a print output, FIG. 4E shows an alarm display, and FIG. 4F shows recovery control. In addition, the number of 1-10 which shows what number pulse is put in the fire pulse signal of FIG. 4 (A).

  As shown in FIG. 4, the fire detector 16 starts receiving the fire pulse signal transmitted by detecting the fire from time t0. The fire pulse signal has a time interval T1 of T1 = about 3 seconds and a pulse width T2 of T2 = 100 to 200 milliseconds, and is continuously transmitted while a fire is detected.

  When the first pulse of the fire pulse signal is received by the disaster prevention receiving board 10, the counter unit 62 sets the count pulse number N = 1 by counting at the time t1 synchronized with the rising of the pulse shifted by one pulse, and the fire determination unit 60 sets the fire judgment time Ta and starts monitoring the passage of time, outputs a fire notice transfer signal to the IG slave station 26, and further prints a fire notice by the alarm unit 45 printer.

  Subsequently, when the disaster prevention receiving board 10 receives the second pulse, the counter unit 60 counts at time t2 shifted by one pulse, and the count pulse number N = 2, and the fire determination unit 62 sets the fire detector 16. Is determined to operate, a predetermined delay time Tb is set, and monitoring of the passage of time is started. Here, the delay time Tb is set to, for example, Tb = 20 seconds as a shorter time than the fire determination time Ta, for example, Ta = 30 seconds. The setting of the delay time Tb is not limited to the second pulse, and may be set by counting predetermined pulses thereafter.

  In addition, the fire determination unit 62 causes the printer of the alarm unit 45 to print a fire notice and synchronizes with the count of the second pulse, and causes the display of the display unit 46 to display the fire notice warning. Furthermore, the fire determination unit 62 compares the count pulse number N by the counter unit 60 with the threshold pulse number Nth = 10.

  Until the third to eighth pulses of the fire pulse signal, the counter unit 60 counts the number of pulses of the fire pulse signal, and the fire determination unit 62 repeats the operation of comparing with the threshold pulse number Nth.

  Subsequently, when the fire determination unit 62 detects the elapse of the delay time Tb at time t3, the fire detector 16 cuts off the power supply to the signal line receiving the fire pulse signal for 1 second, for example. Perform recovery control.

  When the fire detector 16 receives the recovery control by the disaster prevention reception board 10, the operation is stopped by shutting off the power supply, and then the operation is started when the power supply is resumed. If the fire continues at this time, Resume continuous transmission of fire pulse signals.

  The fire pulse signal received after recovery control of the fire detector 16 is the ninth pulse, and the counter unit 60 sets the count pulse number N = 9 by counting. The next fire pulse signal is the 10th pulse, and the counter unit 60 counts the number of counted pulses N = 10. At this time, the fire determination unit 20 determines a fire because the count pulse number N = 10 by the counter unit 62 matches the threshold pulse number Nth = 10, and causes the printer of the alarm unit 45 to print the fire and A fire alarm is displayed on the display, and a fire transfer signal is transmitted to various external equipments to perform a predetermined interlocking operation.

  According to such a fire judgment based on the count of fire pulse signals, a pseudo fire pulse signal (noise pulse) is sent to the disaster prevention receiver 10 in a state that is not an actual fire due to the influence of transient noise such as lightning or radio. ) Is input and counted, a fire is not determined unless the count pulse number N due to noise reaches a predetermined threshold pulse number Nth, for example, 10 pulses within a predetermined fire determination time Ta. The fire judgment due to excessive noise is surely prevented, and unnecessary tunnel closure by interlocking with other facilities can be prevented beforehand.

[Fire judgment control action]
FIG. 5 is a flowchart showing a fire judgment control operation by the disaster prevention reception board, which is a control operation by the control section 40 of the disaster prevention reception board 10 including the counter unit 60 and the fire judgment unit 62.

  As shown in FIG. 5, when the control unit 40 of the disaster prevention receiving board 10 detects reception of the first pulse of the fire pulse signal transmitted by the fire detector 16 in step S1, the control unit 40 proceeds to step S2 and counts by the counter unit 60. If the number of pulses N is set to N = 1 and the first pulse is determined in step 3, the process proceeds to step S4, a fire warning signal is transmitted to the outside, and the fire determination time Ta is set to monitor the passage of time. To do.

  Subsequently, when reception of the second pulse is detected in step S5, the process proceeds to step S6 to output a fire warning warning at the disaster prevention reception place 10 and set a delay time Tb to start time arrival monitoring. In step S7 Steps S1 to S6 are repeated until arrival at the delay time Tb is detected. When it is determined in step S7 that the delay time Tb has elapsed, the process proceeds to step S8, where recovery control of the fire detector 16 is performed and output and display of the fire warning alarm are stopped.

  Subsequently, when it is determined in step S9 that the fire detector 16 has received the fire pulse signal transmitted by resuming the operation after the recovery control, the process proceeds to step S10, where the counter unit 62 sets the count pulse number N to N = 9, and step S11. In comparison with the threshold pulse number Nth, if it is less than the threshold pulse number Nth, the process proceeds to step S12, and if the fire judgment time Ta has not elapsed, the processes of steps S9 to S1 are repeated.

  If it is determined in step S11 that the count pulse number N is equal to the threshold pulse number Nth = 10, the process proceeds to step S13, where a fire alarm is output, and linked control of other equipment is performed. Subsequently, when the input of the recovery operation based on the fire recovery is detected in step S14, the process returns to step S15 to reset the count pulse number N of the counter unit 60 to N = 0, and the process returns to step S1 to determine the next fire pulse signal. Prepare for reception.

  In addition, during the process of steps S9 to S12 after the recovery control of the fire detector 16 in step S8, the arrival of the fire determination time Ta is determined in step S12 without the count pulse number N reaching the threshold pulse number Nth. Then, it is determined that there is no fire, and in step S15, the count pulse number N of the counter unit 60 is reset to N = 0, and the process returns to step S1.

[Short fire judgment after judging non-fire]
When the fire determination unit 62 provided in the control unit 40 of the disaster prevention receiving board 10 of FIG. 2 determines that the number of counted pulses N by the counter unit 60 does not reach the threshold pulse number Nth within the fire determination time Ta and that there is no fire. The fire judgment time Ta is changed to the second fire judgment time Ta2 shorter than that, and the threshold pulse number Nth is changed to the second threshold pulse number Nth2 less than that, and the counter unit 60 performs the second fire judgment time Ta2 within the second fire judgment time Ta2. A fire is determined when the count pulse number N of the fire pulse signal reaches the second threshold pulse number Nth2.

  Due to such a fire determination, the fire detector 16 temporarily interrupts the continuous transmission of the fire pulse signal while it is an actual fire, and the fire determination unit 62 determines that there is no fire, and then the same fire detector 16 fires. When continuous transmission of pulse signals is resumed, it is possible to quickly determine a fire in a shorter time than usual after determining a non-fire.

  FIG. 6 is a time chart showing a control operation for judging a fire in a short time after judging a non-fire, FIG. 6 (A) shows a fire pulse signal, and FIG. 6 (B) shows a counting operation of the counter. 6 (C) shows a report to the IG slave station, FIG. 6 (D) shows a print output, FIG. 6 (E) shows an alarm display, and FIG. 6 (F) shows recovery control.

  In FIG. 6, times t1 to t3 are cases where the fire determination unit 62 determines that the fire does not occur, and the fire pulse signal is from the first pulse to the fifth pulse at time t1, after which the fire pulse signal is received. Instead, at time t3, the fire determination time Ta has passed, and it is determined that there is no fire, and the count pulse number N = 5 of the counter unit 60 is reset to N = 0.

  Subsequently, assuming that the reception of the fire pulse signal from the fire detector 16 that once interrupted the transmission of the fire pulse signal resumed from time t4, the fire determination unit 62 synchronizes with the fall of the resumed first pulse. The previous fire determination time Ta is changed to the second fire determination time Ta2, which is shorter than that, and the threshold pulse number Nth is also changed to the second count threshold Nth2 which is less than that. In this example, the second fire judgment time Ta is changed to half time Ta2 = Ta / 2, and the second threshold pulse number Nth2 is changed to half value Nth2 = Nth / 2 = 5 pulses. .

  For this reason, the fire determination unit 62 determines that the counting pulse number N by the counter unit 60 has reached the second threshold pulse number Nth2 at the fifth pulse of the restarted fire pulse signal, determines the fire, and performs fire printing and fire. Performs alarm output and linked control of other equipment.

  FIG. 7 is a flowchart showing the control operation of the disaster prevention control panel for judging a fire in a short time after judging that it is non-fire.

  In FIG. 7, the processes of steps S21 to S34 and S36 are the same as the processes of steps S1 to S15 of FIG. 5, and steps S35 and S37 are added as new processes.

  Step S35 is a process performed when it is determined in step S32 that the fire pulse signal count pulse number N does not reach the threshold pulse number Nth within the fire determination time Ta, and a non-fire is determined. In S36, the fire determination time Ta is changed to the second fire determination time Ta2, which is shorter than that, and the threshold pulse number Nth is also changed to the second count threshold Nth2 which is less than that. For this reason, in the processing of steps S21 to S33 after determining that there is no fire, a fire determination is made based on the second fire determination time Ta2 and the second count threshold Nth2 whose settings have been changed.

[Fire judgment by two fire detectors in the same section]
(Embodiment when two fire detectors transmit fire pulse signals without duplication)
FIG. 8 is a time chart showing the control operation of the fire judgment when two fire detectors provided in the same section sequentially transmit the fire pulse signal in order, and FIG. 8 (A) is the first fire. FIG. 8B shows the transmission of the fire pulse signal of the second fire detector 16-2, and FIG. 8C shows the received fire pulse signal. 8 (D) shows the counting operation of the counter, FIG. 8 (E) shows the transfer to the IG slave station, FIG. 8 (F) shows the print output, and FIG. 8 (G) shows the alarm display. FIG. 8H shows the recovery control.

  As shown in FIG. 8, the fire detectors 16-1 and 16-2 disposed at both ends of the same section in the tunnel stop transmission after the former transmits five fire pulse signals continuously, Assume that the fire detector 16-2 continuously transmits a fire pulse signal. As a result, the disaster prevention receiving board 10 continuously receives the fire pulse signal from the first pulse to the tenth pulse, so that the count pulse number N becomes N = 10 and reaches the threshold pulse number Nth = 10 within the fire judgment time Ta. It is determined that the fire has occurred, fire is judged, and fire treatment is performed. This is the same operation as when one fire detector 16 shown in FIG. 4 continuously transmits a fire pulse signal.

(Embodiment when two fire detectors transmit fire pulse signals in duplicate)
Fig. 9 shows the control operation for receiving fire pulse signals of two fire detectors installed in the same section redundantly and resolving the fire pulse signals by restarting transmission after recovery to judge the fire. 9A shows the transmission of the fire pulse signal of the first fire detector 16-1, and FIG. 9B shows the fire pulse signal of the second fire detector 16-2. 9 (C) shows the received fire pulse signal, FIG. 9 (D) shows the counting operation of the counter, FIG. 9 (E) shows the transmission to the IG slave station, and FIG. ) Shows the print output, FIG. 9G shows the alarm display, and FIG. 9H shows the recovery control.

  As shown in FIG. 9, in the fire detectors 16-1 and 16-2 arranged at both ends of the same section in the tunnel, the former starts the continuous transmission of the fire pulse signal first, and then the latter is slightly delayed. The fire pulse signal has started to be transmitted continuously. Both fire pulse signals transmitted to the same signal line have the same timing, and the counter unit is at the timing of the rising of two overlapping fire pulse signals shifted by one pulse. The counting pulse number N is obtained by performing 60 counting operations. When the delay time Tb elapses in this state, the fire determination unit 62 performs recovery control at time t3.

  In the present embodiment, the two fire detectors 16-1 and 16-2 that have received the recovery control from the disaster prevention receiving board 10 during the transmission of the fire pulse signal are controlled by the control unit 50 shown in FIG. For example, different fire monitoring start times Ts1, Ts2 are set based on random numbers, and control is performed so that continuous transmission of fire pulse signals is resumed after the fire monitoring start times Ts1, Ts2.

  For this reason, the transmission of the fire pulse signal is resumed at different start timings from the two fire detectors 16-1 and 16-2 that have undergone the recovery control, the duplication of the fire pulse signals up to that point is eliminated, and the counter unit 60 Alternately counts the fire pulse signals from the fire detectors 16-1 and 16-2, and makes it possible to shorten the time until the threshold pulse number Nth = 10 is reached and a fire is determined at time t4.

  FIG. 10 is a flowchart showing the control operation of the fire detector that randomly sets the fire monitoring start time after restoration.

  As shown in FIG. 10, when the control unit 50 of the fire detector 16 determines fire detection in step S41, it proceeds to step S42 and transmits a fire pulse signal. Subsequently, when it is determined in step S43 that the predetermined transmission waiting time T1 has elapsed, the process proceeds to step S44, and when fire detection is determined, a fire pulse signal is transmitted in step S45. Subsequently, in step S46, it is determined whether or not there is restoration control. If there is no restoration control, the process returns to step S43, and the control for transmitting the fire pulse signal at the time interval T1 is repeated.

  If the recovery control by the disaster prevention receiver 10 is determined in step S46 during continuous transmission of the fire pulse signal, the process proceeds to step S47, the fire monitoring start time Ts is set randomly based on the random number, and the fire monitoring is started in step S48. When the elapse of time Ts is determined, the process returns to step S41. When fire detection is determined, the transmission of the fire pulse signal is resumed in step S42.

  By providing the control function shown in FIG. 10 in the fire detector 16 installed in the tunnel, even if the fire pulse signals from the two fire detectors shown in the time chart of FIG. 9 overlap, By the recovery control performed before the fire judgment, it becomes possible to eliminate the overlap of the fire pulse signals, and the time required for the fire judgment can be shortened.

  In addition, although the control part 70 of the fire detector 16 sets mutually different fire monitoring start time Ts by a random number, as long as a different value other than a random number can be set, it may be set by an appropriate method. For example, the fire monitoring start time Ts may be set based on the machine number or the like set in the fire detector 16.

[Modification of the present invention]
(Fire judgment time and delay time)
It is desirable that the fire determination time Ta and the delay time Tb for performing recovery control in the above embodiment can be variably set as necessary.

(Fire detector)
In the above embodiment, a two-wavelength fire detector is taken as an example. For example, in addition to the above-described two wavelengths, the short wavelength side of the 4.4 to 4.5 μm band, which is the resonance emission band of CO ₂ , For example, a three-wavelength flame detector that detects radiation energy in a wavelength band near 3.8 μm by a method similar to the two-wavelength method, and determines the presence or absence of a flame based on the relative ratio of each received light signal in these three wavelength bands. It is also good.

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

DESCRIPTION OF SYMBOLS 1a: Uplink tunnel 1b: Downlink tunnel 10: Disaster prevention receiving board 12: Signal line 16: Fire detector 16a, 16b: Fire detector 24: Fire pump equipment 26: IG slave station equipment 28: Ventilation equipment 30: Alarm display Board equipment 32: Radio rebroadcast equipment 34: Television monitoring equipment 36: Lighting equipment 40, 70: Control section 42: Reception circuit section 45: Alarm section 46: Display section 48: Operation section 50: Modem 60: Counter section 62: Fire Determination units 66a and 66b: sensor units 68a and 68b: amplification processing unit 72: pulse transmission unit

Claims (6)

In a tunnel disaster prevention system that monitors and connects multiple fire detectors installed in the tunnel to the disaster prevention reception board,
The fire detector includes a control unit that transmits a fire pulse signal at a predetermined time interval when a fire is detected,
The disaster prevention reception board
A counter unit for receiving the fire pulse signal transmitted from the fire detector and counting the number of pulses;
A fire determination unit that determines a fire when the count pulse number by the counter unit reaches a predetermined threshold pulse number within a predetermined fire determination time;
A tunnel disaster prevention system characterized by comprising
In the tunnel disaster prevention system according to claim 1,
The fire determination unit of the disaster prevention reception panel determines that the fire detector is activated when a predetermined pulse after the second pulse of the fire pulse signal or after is received, sets a predetermined delay time, and sets the delay time. The tunnel disaster prevention system is characterized in that the fire detector is restored at the time when elapses, and a fire is judged when the count pulse number reaches the predetermined threshold pulse number after the restoration.
In the tunnel disaster prevention system according to claim 2,
The fire determination unit of the disaster prevention reception board determines that the fire determination time is shorter than the second time when the count pulse number by the counter unit determines that the fire does not reach the threshold pulse number within the fire determination time and does not fire. While changing to the fire judgment time, the threshold pulse number is changed to a second threshold pulse number smaller than that, and the count pulse number of the fire pulse signal by the counter unit is changed to the second threshold pulse number within the second fire judgment time. A tunnel disaster prevention system characterized by a fire when it reaches
In the tunnel disaster prevention system according to claim 2,
A plurality of fire detectors are provided for each section obtained by dividing the tunnel at predetermined intervals.
The counter part of the disaster prevention receiving board receives a fire pulse signal transmitted at a predetermined time interval from each of a plurality of fire detectors provided in the same section in the tunnel, and counts the number of pulses.
The fire determination unit of the disaster prevention reception panel receives a predetermined delay when receiving a second predetermined pulse after the second pulse of the fire pulse signal transmitted from each of a plurality of fire detectors provided in the same section or after that. A time is set, and when the delay time elapses, control is performed to restore the fire detector. After the restoration, it is determined that a fire occurs when the number of fire pulses reaches the predetermined threshold within the fire determination time. And
The control unit of the plurality of fire detectors provided in the same section, when receiving a recovery control by the disaster prevention reception board during the transmission of the fire pulse signal, set different fire monitoring start time, A tunnel disaster prevention system, wherein transmission of the fire pulse signal is resumed after a fire monitoring start time has elapsed.
The tunnel disaster prevention system according to claim 4, wherein the control unit of the fire detector sets the fire monitoring start time based on a random number when receiving a recovery control by the disaster prevention reception board. Tunnel disaster prevention system.
  2. The tunnel disaster prevention system according to claim 1, wherein the fire judgment time is set based on a time for continuously receiving the fire pulse signals corresponding to the threshold pulse number.

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