JP6527044B2 - Tunnel disaster prevention system - Google Patents

Description

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

  Conventionally, in tunnels such as motorways, emergency facilities are installed to protect human bodies and vehicles from fire accidents that occur in the tunnels.

  Such emergency facilities include a fire detector, a manual notification device, and an emergency telephone for monitoring and reporting fires, a fire hydrant for fire extinguishment and fire spread prevention, and a tunnel housing. In order to protect from a fire, water spray etc. which spray water for fire extinguishing from a water spray head are installed, and a tunnel disaster prevention system is constructed by providing a disaster prevention reception board which monitors and controls the terminal equipment of these emergency facilities. .

  A tunnel disaster prevention system consisting of a disaster prevention reception board and terminal equipment is roughly classified into an R type transmission method and a P type direct transmission method. In the R type transmission method, terminal equipment such as a fire detector whose address is set to a transmission line is connected, and transmission control enables individual management to perform detection and control in units of terminal equipment. In the P-type direct transmission method, a plurality of terminal devices entering the same section are connected to the signal line drawn in the section unit according to the type of the terminal device, and detection and control are performed in the signal line unit.

  As a tunnel disaster prevention system, a tunnel disaster prevention system of R type transmission method or P type direct transmission method should be constructed in consideration of merits and demerits of R type transmission method and P type direct transmission method, tunnel length and traffic volume of vehicles. I have to.

  In the case of tunnel disaster prevention system by P type direct delivery method, the fire detector installed in the tunnel is equipped with 2 sets of fire detection units that monitor fire independently with the range of 25 meters or 50 meters on both sides as detection area. The tunnel is divided into multiple sections by the installation interval of the detector, and the fire detection unit monitoring the same sections of the fire detectors located at both ends of the section is connected to the signal line drawn out from the disaster prevention reception board in the section unit And monitor fires on a signal line basis. Also, when a fire detector detects a fire, it outputs a fire pulse signal at predetermined time intervals.

  The conventional fire judgment by the disaster prevention reception board of such P type direct transmission method, when fire pulse signals are received from the fire detector at predetermined time intervals, the first pulse is used as a fire notice signal and the notice transfer to the outside is performed. A fire is detected when a fire pulse is received from the fire detector again within a predetermined time after restoration by judging that the fire detector is activated by receiving the second pulse, and the fire detector is restored after a predetermined delay time. Judge and fire treatment, and if it does not receive a fire pulse again within a predetermined time, it is treated as non-fire.

  Fire treatment when it is judged as fire by the disaster prevention monitoring panel, in addition to the output and printing output of the panel's own fire alarm, IG slave station equipment connected in communicative connection with fire extinguishing pump equipment and remote control equipment, ventilation equipment, alarm display board equipment Synchronized control of other equipment such as radio rebroadcasting equipment, television surveillance equipment, lighting equipment and so on.

Japanese Patent Laid-Open No. 2002-246962 Japanese Patent Application Laid-Open No. 11-128381

  However, in such a conventional P-type direct transmission method tunnel disaster prevention system, a simulated fire pulse signal is transmitted to the disaster prevention receiving board in a state that it is not an actual fire due to the influence of transient noise such as lightning or radio. In some cases, a fire is judged by the disaster prevention reception board and fire treatment is performed, and other facilities are interlocked and the tunnel is often closed.

  An object of the present invention is to provide a tunnel disaster prevention system capable of reliably preventing false fire judgments due to the influence of transient noise and avoiding unnecessary closing of tunnels without impairing fire judgments against actual fires. With the goal.

(Tunnel disaster prevention system)
The present invention relates to a tunnel disaster prevention system in which a fire detector installed in a tunnel is connected to a disaster prevention reception board and monitored.
The fire detector includes a control unit that transmits a fire pulse signal at predetermined time intervals when detecting a fire.
Disaster prevention reception board is
A counter unit that receives the fire pulse signal transmitted from the fire detector and counts the number of pulses;
A fire judgment unit that judges a fire when the number of pulses counted by the counter unit reaches a predetermined threshold pulse number within a predetermined fire judgment time;
Equipped with
The fire judgment unit of the disaster prevention reception board judges that the fire detector is activated when it receives a second pulse of the fire pulse signal or a predetermined pulse thereafter, and sets a predetermined delay time, and the time when the delay time has passed And the fire detector is restored, and when the counted pulse number reaches a predetermined threshold pulse number after the restoration, the fire detector is determined to be a fire .
(Fire judgment following non-fire judgment)
In addition, when the fire judgment unit of the disaster prevention reception board judges that the counted pulse number by the counter unit is not a fire without reaching the threshold pulse number within the fire judgment time, the fire judgment time is shorter than the second fire judgment time And change the threshold pulse number to a second threshold pulse number smaller than that, and 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 and the fire to decide.

(Fire judgment by multiple fire detectors)
A fire detector is provided for each section where the tunnel is divided at predetermined intervals,
The counter unit of the disaster prevention reception board receives fire pulse signals transmitted at predetermined time intervals from a plurality of fire detectors provided in the tunnel and counts the number of pulses,
Point a fire determination portion disaster prevention receiving plate is to set the predetermined delay time when receiving the second pulse or subsequent predetermined pulse transmitted the fire pulse signals from a plurality of fire detectors, it has passed the delay time And the fire detector is restored, and it is determined that the fire occurs when the counted number of pulses reaches a predetermined threshold pulse number within the fire determination time after the restoration.

(Fire judgment by multiple fire detectors provided in the same section)
Several fire detectors are provided for each section of the tunnel divided by 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 has elapsed, control is performed to restore the fire detector, and when the number of fire pulses reaches a predetermined threshold within the fire determination time after the recovery, the fire is determined to be a fire.

The control unit of the plurality of fire detectors sets different fire monitoring start times when receiving recovery control by the disaster prevention receiving panel while transmitting fire pulse signals, and the fire pulse signals are set after the fire monitoring start time has elapsed. Resume sending

(Setting of fire monitoring disclosure time by random number)
The control unit of the fire detector sets the fire monitoring start time based on the random number when the recovery control is received by the disaster prevention receiving board.

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

(Basic effect)
The present invention relates to a tunnel disaster prevention system in which a plurality of fire detectors installed in a tunnel are connected to a disaster prevention receiving board and monitored, wherein the fire detectors detect a fire at predetermined time intervals. The control unit which transmits the fire pulse signal, the disaster prevention reception board receives the fire pulse signal transmitted from the fire detector, and the counter unit which counts the number of pulses, and the counting pulse number counted by the counter unit is fire judgment Because it has a fire judgment unit that judges it as a fire when it reaches a predetermined threshold pulse number in time, it is not a real fire under the influence of transient noises such as lightning and radio, etc., the disaster prevention reception board Even if a pseudo fire pulse signal is input and counted, it is judged as a fire unless the number of counting pulses due to noise reaches a predetermined threshold pulse number, for example 10 pulses, within a predetermined fire judgment time. Not Rukoto, erroneous fire determination by transient noise reliably prevented, enabling preventing closures unnecessary tunnel by interlocking of other equipment in advance.

(Effect of delay time setting and recovery operation)
In addition, when the fire judgment unit of the disaster prevention reception board receives a second pulse of the fire pulse signal or a predetermined pulse thereafter, the fire judgment unit judges that the fire detector is activated and sets a predetermined delay time, and the delay time elapses. Since the fire detector is restored at the time when the counting pulse number reaches the predetermined threshold pulse number within the fire judgment time after the restoration, the number of counting pulses is equal to the predetermined threshold pulse number because the fire is determined to be fire. During the arrival, the fire detector is once restored, and after receiving the fire pulse signal from the fire detector and counting again, it is judged as a fire, and the reliability of the fire judgment by the so-called counter method is improved. To be possible.

(Effect of fire judgment following non-fire judgment)
In addition, when the fire judgment unit of the disaster prevention reception board judges that the counted pulse number by the counter unit is not a fire without reaching the threshold pulse number within the fire judgment time, the fire judgment time is shorter than the second fire judgment time And change the threshold pulse number to a second threshold pulse number smaller than that, and 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 and the fire Since the fire detector decides to interrupt the continuous transmission of the fire pulse signal temporarily to judge it as a non-fire, and then resumes the continuous transmission of the fire pulse signal after that, the non-fire is not effective. It makes it possible to quickly judge a fire in a shorter time than usual after judging it as a fire.

(Effect of fire judgment by multiple fire detectors provided in the same section)
In addition, a plurality of fire detectors are provided in each section obtained by dividing the tunnel at predetermined intervals, and the counter unit of the disaster prevention receiving board is provided with predetermined time intervals from each of the plurality of fire detectors provided in the same section in the tunnel. The fire judgment unit of the disaster prevention reception board receives the second pulse of the fire pulse signal transmitted from each of a plurality of fire detectors provided in the same section or When a predetermined pulse after that is received, a predetermined delay time is set, and control is performed to restore the fire detector when the delay time passes, and after the recovery, the number of fire pulses is a predetermined threshold within the fire judgment time If the fire detection signal is received by the disaster prevention reception board during transmission of fire pulse signals, the control units of a plurality of fire detectors provided in the same section are determined to be a fire when they reach fire Since the visual start time is set and transmission of the fire pulse signal is restarted after the fire monitoring start time, two fire detectors provided at both ends of the section detect fire in the same section and fire pulse is detected. If signals are continuously transmitted and both fire pulse signals are received redundantly by the disaster prevention reception panel, fire control from the two fire detectors will be performed when recovery control is performed after a predetermined delay time has elapsed. The fire monitoring start time before resuming transmission of the fire is set to mutually different time, and the fire pulse signal does not overlap by the timing which restarts transmission of the fire pulse signal being different, and separate from the two fire detectors By counting the fire pulse signal continuously transmitted at the timing of 1, it is possible to shorten the time until the threshold pulse number is reached and the fire is determined.

Explanatory drawing showing the outline of the tunnel disaster prevention system which adopts P type direct transmission Block diagram schematically showing the functional configuration of the disaster prevention reception board Block diagram schematically showing the functional configuration of the fire detector Time chart showing control operation of fire judgment by counting fire pulse signals Flow chart showing control operation of fire judgment by disaster prevention reception board A time chart showing the control action to judge a fire in a short time after judging it as a non-fire Flow chart showing the control operation of the disaster prevention reception board that judges fire in a short time after judging it as non-fire Time chart showing the control operation of fire judgment when two fire detectors provided in the same section transmit fire pulse signals successively in sequence The time chart which showed the control action which the fire pulse signal of 2 fire detectors which are provided in the same section is received overlappingly, the duplication of the fire pulse signal is canceled and the fire is judged by the transmission resumption after restoration Flow chart showing control operation of fire detector that randomly sets fire monitoring start time after restoration

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

  Inside the upstream tunnel 1a and the downstream tunnel 1b, fire detectors 16 are installed at intervals of, for example, 25 meters along the wall surface in the longitudinal direction of the tunnel. The fire detector 16 has two sets of fire detection units, sets monitoring areas on both sides 25 meters, detects fire from flames, and continuously detects fire pulse signals at predetermined time intervals while detecting fires. 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 detectors 16. In the tunnel, in addition to the fire detector 16, facility equipment such as a fire hydrant device and an automatic valve device of a water spray facility are installed, but illustration is omitted.

From the disaster prevention reception board 10, the fire line 16 is divided into the upstream tunnel 1a and the downstream tunnel 1b, divided into the sections A1 to An and the sections B1 to Bn, and the signal lines 12 for n circuits are drawn. Connected in signal line units.

  In addition to fire detector 16, fire hydrant device and automatic valve device as emergency facilities for tunnel, fire extinguishing pump equipment 24, IG slave station equipment 26, ventilation equipment 28, alarm display board equipment 30, radio rebroadcasting equipment 32, television A monitoring facility 34 and a lighting facility 36 are provided, and other facilities are individually connected to the disaster prevention receiving board 10 by a 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 equipment 26 is a communication equipment connecting the disaster prevention receiving board 10 and other equipment with the remote management equipment. The ventilation facility 28 is a facility that gives energy to the air in the tunnel by the high blowing velocity by the operation of a jet fan installed on the ceiling side in the tunnel and causes an evoked flow in the longitudinal direction of the tunnel.

  Moreover, the alarm display board installation 30 is an installation which displays the abnormality in a tunnel on the electric display board, and notifies it to the user in a tunnel. The radio rebroadcasting facility 32 is a facility for enabling a driver or the like to receive information from a road manager in a tunnel. The television monitoring equipment 34 is equipment for confirming the size and position of the fire, and operating the water spray equipment, and grasping the condition in the tunnel when performing evacuation guidance. The lighting equipment 36 is equipment that drives and manages lighting equipment in the tunnel.

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

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

Here, since the fire detector 16 is provided with two sets of fire detection units 16a and 16b, the fire detection unit 16a of the fire detector 16 uses the sections A1, An, B1 and Bn at both ends of the tunnel as monitoring areas. One fire 16b is connected to the corresponding line reception section 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 The corresponding fire detectors 16a, 16b of the unit 16 are connected to the line receiver 42 by the same signal line 12.

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

Further, the control unit 40 is provided with the 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 N of pulses. The fire judgment unit 62 judges that a fire occurs when the count pulse number N by the counter unit 60 reaches a predetermined threshold pulse number Nth within a predetermined fire judgment time Ta.

Here, assuming that the time interval T1 of the fire pulse signal output by the fire detector 16 is, for example, T1 = 3 seconds, 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) = 30 seconds is set to a time obtained by adding a desired margin time. The fire judgment time Ta is a time not exceeding the maximum fire judgment time required for the tunnel disaster prevention system.

  More specifically, when the fire judgment unit 62 receives the first pulse of the fire pulse signal, the fire judgment unit 62 instructs the modem 50 to output a fire notice transfer notification signal to the IG slave station equipment 26 and so on. When the second pulse of the fire pulse signal is received, it is determined that the fire detector 16 is activated, and a fire advance warning is displayed and printed, and a predetermined delay time Tb is set, and the delay time Tb is elapsed. The fire detector 16 is restored at the time of fire, and the count pulse number N by the counter unit 60 of the fire pulse signal whose transmission is resumed by the fire detector 16 after restoration has reached a predetermined threshold pulse number Nth within the fire judgment time Ta. In case of fire it is judged.

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

The fire detection unit 16a monitors a 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 emission band of CO ₂ specific to a flame, by a narrow band optical wavelength band pass filter, and the radiation by the light receiving sensor After energy is detected and photoelectrically converted, predetermined processing such as amplification is performed by the amplification processing unit 68a, and the received light signal corresponding to the amount of energy is processed and output to the control unit 70.

The sensor unit 66b selectively transmits (passes) radiant energy in the vicinity of 5.1 μm, which is outside 4.4 to 4.5 μm, which is a resonance emission band of CO ₂ specific to flames, using a narrow band optical wavelength band pass filter. The radiation energy is detected and photoelectrically converted by the light receiving sensor, and then predetermined processing such as amplification is performed by the amplification processing unit 68 b to process the light reception signal corresponding to the energy amount and output it to the control unit 70.

  The control unit 70 takes the relative ratio of the light reception signal levels output from the amplification processing units 68a and 68b, determines the presence or absence of a flame by comparing with a predetermined threshold, and detects a fire by the presence of a flame. And instructs the pulse transmission unit 72 to continuously transmit a fire pulse signal of a predetermined pulse width T2 at a predetermined time interval T1.

  Such flame judgments include infrared radiators other than flames, for example, high temperature radiators such as sunlight (6000 ° C.), relatively low temperature radiators of about 300 ° C., low temperature radiators such as human body, etc. This makes it possible to distinguish between fire and fire.

[Fire judgment by counting fire pulse signals]
FIG. 4 is a time chart showing a control operation of fire judgment by counting fire pulse signals, FIG. 4 (A) shows a fire pulse signal, FIG. 4 (B) shows a counting operation of a counter, C) shows the transfer notification to the IG slave station, FIG. 4D shows the print output, FIG. 4E shows the alarm display, and FIG. 4F shows the recovery control. In the fire pulse signal of FIG. 4A, numerals 1 to 10 indicating the number of the pulse are inserted.

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

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

  Subsequently, when the disaster prevention receiving board 10 receives the second pulse, it counts at the time t2 when the counter unit 60 shifts one pulse, and sets the count pulse number N to 2, and the fire judgment unit 62 Is set, and a predetermined delay time Tb is set to start monitoring the passage of time. Here, the delay time Tb is set to, for example, Tb = 20 seconds as a time shorter 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 the predetermined pulses thereafter.

  Further, the fire judgment unit 62 causes the printer of the alarm unit 45 to print a fire notice and causes the display of the display unit 46 to display a fire notice warning in synchronization with the counting of the second pulse. Furthermore, the fire judgment unit 62 compares the count pulse number N by the counter unit 60 with the threshold pulse number Nth = 10.

  For 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 judgment unit 62 repeats the operation of comparing with the threshold pulse number Nth.

  Subsequently, when the fire judgment unit 62 detects that the delay time Tb has elapsed at time t3, the fire detector 16 is shut off by, for example, shutting off the power supply to the signal line receiving the fire pulse signal for one second. Perform recovery control of

  When the fire detector 16 receives 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, and if the fire continues at this time, Resume continuous transmission of fire pulse signal.

The fire pulse signal received after recovery control of the fire detector 16 is the ninth pulse, and the counter unit 60 counts the number of pulse pulses N = 9. 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 judgment unit 62 judges a fire because the counted pulse number N = 10 by the counter unit 60 becomes equal to the threshold pulse number Nth = 10, and causes the printer of the alarm unit 45 to print a fire. A fire alarm is displayed on the display, and further, a fire notification signal is transmitted to various external facilities to perform a predetermined interlocking operation.

  According to the fire judgment based on the counting of such fire pulse signals, the fire fire signal (noise pulse) (noise pulse) is transmitted to the disaster prevention receiving board 10 in a state where it is not a real fire due to the influence of transient noise such as lightning or radio. Even if N) is counted by input, it is not judged as a fire unless it reaches a predetermined threshold pulse number Nth, for example 10 pulses, within a predetermined fire judgment time Ta. Certainly prevent fire judgment caused by excessive noise and make it possible to prevent unnecessary tunnel closure due to interlocking of other facilities in advance.

[Control operation of fire judgment]
FIG. 5 is a flowchart showing a control operation of fire judgment by the disaster prevention reception board, which is a control operation by the control unit 40 of the disaster prevention reception board 10 provided with 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 the 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 the counter unit 60. When the pulse number N is N = 1, and the first pulse is determined in step 3, the process proceeds to step S4 to transmit a fire warning announcement signal to the outside, and set a fire determination time Ta to monitor time lapse Do.

  Subsequently, when the reception of the second pulse is detected in step S5, the process proceeds to step S6, the fire alarm is output at the disaster prevention reception field 10, and the delay time Tb is set to start monitoring for time arrival. The processes in steps S1 to S6 are repeated until it is detected that the delay time Tb has been reached. 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 the output and display of the fire advance warning are stopped.

Subsequently, when it is determined in step S9 that the fire detector 16 has received the fire pulse signal transmitted by resuming operation after recovery control, the process proceeds to step S10, the counting pulse number N is set to N = 9 by the counter unit 60 , and step S11 The threshold pulse number Nth is compared with the threshold pulse number Nth, and if less than the threshold pulse number Nth, the process proceeds to step S12, and if it is before the fire determination time Ta has elapsed, the processing of steps S9 to S1 is repeated.

  If it is determined in step S11 that the counted pulse number N matches the threshold pulse number Nth = 10, the process proceeds to step S13, a fire alarm is output, and interlock control of other facilities 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, resets the count pulse number N of the counter unit 60 to N = 0, and returns to step S1 for the next fire pulse signal. Prepare for reception.

  In step S8, during the processing of steps S9 to S12 after the recovery control of the fire detector 16, the count pulse number N does not reach the threshold pulse number Nth, and in step S12 it is determined that the fire determination time Ta has been reached. 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-term fire judgment after judging as non-fire]
The fire judgment unit 62 provided in the control unit 40 of the disaster prevention receiving board 10 of FIG. 2 does not reach the threshold pulse number Nth within the fire judgment time Ta when judging that the fire is not a fire. The fire judgment time Ta is changed to the second fire judgment time Ta2 which is shorter than that, and the threshold pulse number Nth is changed to the second threshold pulse number Nth2 which is smaller than that, and the second fire judgment time Ta2 is changed by the counter unit 60 within the second fire judgment time Ta2. When the counted pulse number N of the fire pulse signal reaches the second threshold pulse number Nth2, it is determined that a fire occurs.

  Based on such fire judgment, the fire detector 16 temporarily interrupts continuous transmission of the fire pulse signal even though it is a real fire, and the fire judgment unit 62 judges that the fire is not a fire, and thereafter the same fire detector 16 fires When continuous transmission of the pulse signal is resumed, it is possible to quickly judge the fire in a shorter time than usual after judging that it is 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 a counter. 6 (C) shows the transfer notification to the IG slave station, FIG. 6 (D) shows the print output, FIG. 6 (E) shows the alarm display, and FIG. 6 (F) shows the recovery control.

  In FIG. 6, times t1 to t3 are when the fire judgment unit 62 judges that there is no fire, and the fire pulse signal is from the first pulse to the fifth pulse at time t1, and thereafter the fire pulse signal is received No, at time t3, it is determined that a fire does not occur when the fire determination time Ta has elapsed, 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 which has suspended transmission of the fire pulse signal resumes from time t4, the fire judgment unit 62 synchronizes with the fall of the restarted first pulse. The fire judgment time Ta until then is changed to the second fire judgment time Ta2 shorter than that, and the threshold pulse number Nth is changed to the second counting threshold Nth2 smaller than that. In this example, the second fire determination time Ta is changed to a half time Ta2 = Ta / 2, and the second threshold pulse number Nth2 is changed to a half value Nth2 = Nth / 2 = 5 pulses. .

  Therefore, the fire judgment unit 62 judges that the counted 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, judges the fire, and prints fire and fire Perform alarm output and interlock control of other facilities.

  FIG. 7 is a flow chart showing the control operation of the disaster prevention control panel which determines a fire in a short time after determining that it is not a 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 the processes of steps S35 and S37 are added as new processes.

  Step S35 is processing performed when it is determined that the number N of fire pulses of the fire pulse signal does not reach the threshold pulse number Nth within the fire determination time Ta in step S32 and the fire determination unit 62 determines that the fire is not a fire. In S36, the fire judgment time Ta is changed to the second fire judgment time Ta2 which is shorter than that, and the threshold pulse number Nth is also changed to the second counting threshold Nth2 which is smaller. For this reason, in the processing of steps S21 to S33 after determining that there is no fire, fire determination is performed based on the second fire determination time Ta2 and the second count threshold Nth2 whose setting has 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 fire judgment when two fire detectors provided in the same section sequentially transmit fire pulse signals, and FIG. 8 (A) is the first fire The transmission of the fire pulse signal of the detector 16-1 is shown, FIG. 8 (B) shows the transmission of the fire pulse signal of the second fire detector 16-2, and FIG. 8 (C) is the received fire pulse signal. 8 (D) shows the counting operation of the counter, FIG. 8 (E) shows the transfer report to the IG slave station, FIG. 8 (F) shows the print output, and FIG. 8 (G) shows the alarm display. FIG. 8 (H) shows recovery control.

  As shown in FIG. 8, fire detectors 16-1 and 16-2 disposed at both ends of the same section in the tunnel stop transmission after the former transmits 5 pulses of fire pulse signals continuously, and then It is assumed 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, and the counting 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 been judged and the fire treatment is performed. This is the same operation as when one fire detector 16 shown in FIG. 4 transmits the fire pulse signal continuously.

(Embodiment when two fire detectors overlap and transmit fire pulse signals)
Fig. 9 shows the control action of receiving fire pulse signals of two fire detectors provided in the same section in duplicate and judging the fire by eliminating the fire pulse signal duplication by resuming transmission after recovery It is a chart, FIG. 9 (A) shows transmission of the fire pulse signal of the 1st fire detector 16-1, and FIG. 9 (B) shows the fire pulse signal of the 2nd fire detector 16-2. FIG. 9 (C) shows the received fire pulse signal, FIG. 9 (D) shows the counting operation of the counter, FIG. 9 (E) shows the transfer notification to the IG slave station, and FIG. 9 (G) shows a print output, FIG. 9 (G) shows an alarm display, and FIG. 9 (H) shows a recovery control.

  As shown in FIG. 9, the fire detectors 16-1 and 16-2 disposed at both ends of the same section in the tunnel, the former first starts continuous transmission of fire pulse signals, and then the latter is slightly delayed. Continuous transmission of fire pulse signals is started, and the fire pulse signals transmitted to the same signal line by both parties overlap in timing, and the counter unit is shifted by one pulse on the rising edge of two overlapping fire pulse signals. The count pulse number N is obtained by performing 60 count operations. When the delay time Tb elapses in this state, the fire judgment unit 62 performs restoration control at time t3.

In the present embodiment, the two fire detectors 16-1 and 16-2 which have received recovery control from the disaster prevention receiving board 10 during transmission of fire pulse signals are controlled by the control unit 70 shown in FIG. For example, different fire monitoring start times Ts1 and Ts2 are set based on random numbers, and control is made to resume continuous transmission of fire pulse signals after the fire monitoring start times Ts1 and Ts2 have elapsed.

  For this reason, transmission of fire pulse signals is resumed at different start timings from the two fire detectors 16-1 and 16-2 which have been subjected to recovery control, and duplication of fire pulse signals up to that point is resolved. Can alternately count the fire pulse signals from the fire detectors 16-1 and 16-2, and shorten the time from reaching the threshold pulse number Nth = 10 to determining the fire at time t4.

  FIG. 10 is a flowchart showing the control operation of the fire detector in which the fire monitoring start time after restoration is randomly set.

As shown in FIG. 10, when the fire detection is determined in step S41, the control unit 70 of the fire detector 16 proceeds to step S42 to transmit 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. When fire detection is determined, a fire pulse signal is transmitted in step S45. Subsequently, in step S46, the presence or absence of recovery control is determined. If recovery control is not performed, the process returns to step S43, and control of transmitting a fire pulse signal at time interval T1 is repeated.

  If the recovery control by the disaster prevention reception board 10 is determined in step S46 during continuous transmission of fire pulse signals, the process proceeds to step S47, the fire monitoring start time Ts is randomly set based on the random number, and fire monitoring starts in step S48. When it is determined that the time Ts has elapsed, the process returns to step S41, and when it is determined that a fire is detected, transmission of a fire pulse signal is restarted in step S42.

  By providing the control function shown in FIG. 10 in the fire detector 16 installed in the tunnel, even if fire pulse signals from the two fire detectors shown in the time chart in FIG. 9 overlap, It is possible to eliminate duplication of fire pulse signals by restoration control performed before fire judgment, and it is possible to shorten the time required for fire judgment.

  In addition, although the control part 70 of the fire detector 16 sets the mutually different fire monitoring start time Ts with a random number, as long as a different value other than a random number can be set, you may set it with 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 the recovery control in the above embodiment can be variably set as needed.

(Fire detector)
Although the above-described embodiment takes a fire detector of a two-wavelength system as an example, for example, in addition to the two wavelengths described above, on the short wavelength side with respect to the 4.4 to 4.5 μm band which is a resonance emission band of CO ₂ , For example, a three-wavelength flame detector that detects radiation energy in a wavelength band around 3.8 μm by the same method as the two-wavelength formula and determines the presence or absence of a flame by the relative ratio of light reception signals in these three wavelength bands As well.

(Others)
Furthermore, 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 embodiment.

1a: Uplink tunnel 1b: Downlink tunnel 10: Disaster prevention reception board 12: Signal line 16: fire detector 16a, 16b: fire detection unit 24: fire extinguishing pump equipment 26: IG slave station equipment 28: ventilation equipment 30: alarm display Board equipment 32: Radio rebroadcasting equipment 34: Television monitoring equipment 36: Lighting equipment 40, 70: Control unit 42: Line reception unit 45: Alarm unit 46: Display unit 48: Operation unit 50: Modem 60: Counter unit 62: Fire Determination unit 66a, 66b: Sensor unit 68a, 68b: Amplification processing unit 72: Pulse transmission unit

Claims (7)

In the tunnel disaster prevention system which connects and monitors the fire detector installed in the tunnel to the disaster prevention reception board,
The fire detector includes a control unit that transmits a fire pulse signal at predetermined time intervals when a fire is detected.
The disaster prevention reception board is
A counter unit that receives the fire pulse signal transmitted from the fire detector and counts the number of pulses;
A fire judgment unit which judges that a fire occurs when the number of pulses counted by the counter unit reaches a predetermined threshold pulse number within a predetermined fire judgment time;
Equipped with
The fire judgment unit of the disaster prevention reception board judges that the fire detector is in operation and sets a predetermined delay time when receiving a second pulse of the fire pulse signal or a predetermined pulse thereafter, and sets the delay time to the delay time The tunnel disaster prevention system is characterized in that the fire detector is restored when it passes, and the fire is judged to be a fire when the counted pulse number reaches the predetermined threshold pulse number after the restoration .
In the tunnel disaster prevention system according to claim 1 ,
When the fire judgment unit of the disaster prevention reception board judges that the counted pulse number by the counter unit is not a fire without reaching the threshold pulse number within the fire judgment time, the fire judgment time is shorter than that second The threshold pulse number is changed to a smaller second threshold pulse number while changing to the fire determination time, and the counting pulse number of the fire pulse signal by the counter unit is the second threshold pulse number within the second fire determination time. A tunnel disaster prevention system characterized by judging it as a fire when it reaches
In the tunnel disaster prevention system according to claim 1,
A fire detector is provided for each section obtained by dividing the tunnel at predetermined intervals,
The counter unit of the disaster prevention receiving board receives fire pulse signals transmitted at predetermined time intervals from a plurality of fire detectors provided 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 receiving a second pulse of the fire pulse signal transmitted from the plurality of fire detectors or a predetermined pulse thereafter, and the delay time The tunnel disaster prevention system is characterized in that the fire detector is restored when the time has passed, and the fire is judged to be a fire when the counted pulse number reaches the predetermined threshold pulse number within the fire judgment time after the restoration. .
In the tunnel disaster prevention system according to claim 1 ,
A plurality of fire detectors are provided for each section obtained by dividing the tunnel at predetermined intervals,
The counter unit of the disaster prevention receiving 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 receives a predetermined pulse of 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. Control is performed to restore the fire detector when the delay time has elapsed, and when the number of fire pulses reaches the predetermined threshold within the fire determination time after the recovery, the fire is determined to be a fire. Tunnel disaster prevention system characterized by
The tunnel disaster prevention system according to claim 3 or 4, wherein the control units of the plurality of fire detectors receive different fires when receiving recovery control by the disaster prevention receiving board while transmitting the fire pulse signal. A tunnel disaster prevention system comprising setting a monitoring start time and resuming transmission of the fire pulse signal after the fire monitoring start time has elapsed.
The tunnel disaster prevention system according to claim 3 or 4 , wherein the control unit of the fire detector sets the fire monitoring start time based on a random number when receiving recovery control by the disaster prevention receiving board. The tunnel disaster prevention system that features.
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 signal for the threshold pulse number.

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