Disaster prevention system

Abstract

To make it easier to plan the cleaning of fire detectors. [Solution] The disaster prevention system includes: an acquisition means for acquiring the degree of contamination of the light-receiving window of a fire detector; an alert output means for outputting a contamination alarm when the contamination degree acquired by the acquisition means exceeds a contamination alarm level, and for outputting a contamination warning when the contamination degree does not exceed the contamination alarm level but exceeds a contamination warning level; a first timing means for timing the period from when a contamination warning is output by the alert output means until a contamination alarm is output; and a first period output means for outputting the period timing by the first timing means.

Description

Technical Field

[0001] The present invention relates to a disaster prevention system.

Background Art

[0002] Patent Document 1 describes a problem of "making it easier to perform maintenance including cleaning on a fire detector installed in a tunnel by reducing the variation in the period from a contamination warning to a contamination alarm" (see the abstract). Also, Patent Document 1 describes, as a solution to this problem, that "the contamination determination unit 12 outputs a contamination warning when the contamination analog value signal transmitted from the optical fire detector exceeds a predetermined warning determination level, and outputs a contamination alarm when the contamination analog value signal exceeds a predetermined alarm determination level higher than the warning determination level after the output of the contamination warning. The determination level adjustment unit 13 can adjust the warning determination level according to the installation position or season of the optical fire detector, and can further automatically adjust the warning determination level according to the period from the warning to the alarm" (see the abstract).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the system described in Patent Document 1, the warning determination level can be automatically adjusted according to the period from the warning to the alarm. However, there is no particular description about outputting the period from the warning to the alarm. Therefore, the user of the system cannot know the period from the warning to the alarm. The present invention has been made in view of such circumstances, and an object thereof is to make it easier to make a cleaning plan for a fire detector.

Means for Solving the Problems

[0005] To solve the above problems, the disaster prevention system according to the present invention includes: an acquisition means for acquiring the degree of contamination of the light-receiving window of a fire detector; an alert output means for outputting a contamination alarm when the contamination degree acquired by the acquisition means exceeds a contamination alarm level, and for outputting a contamination warning when the contamination degree does not exceed the contamination alarm level but exceeds a contamination warning level; a first timing means for timing the period from when the contamination warning is output by the alert output means until the contamination alarm is output; and a first period output means for outputting the period timing by the first timing means. [Effects of the Invention]

[0006] According to the present invention, it is possible to make it easier to plan the cleaning of fire detectors. [Brief explanation of the drawing]

[0007] [Figure 1] Figure 1 shows an example of the relationship between the number of tests and the degree of contamination of the light-receiving window. [Figure 2] Figure 2 shows another example of the relationship between the number of tests and the degree of contamination of the light-receiving window. [Figure 3] Figure 3 shows an example of a disaster prevention system 300 for tunnels. [Figure 4] Figure 4 shows an example of the configuration of the disaster prevention receiving panel 302. [Figure 5] Figure 5 shows an example of fire extinguishing operation 500. [Figure 6] Figure 6 shows an example of the period timing operation 600. [Modes for carrying out the invention]

[0008] 1. Examples An embodiment of the present invention will be described with reference to the drawings. 1-1. Overview First, an overview of one embodiment of the present invention will be described. In this embodiment, the period from the output of a damage warning to the output of a damage alarm is measured. By measuring, accumulating, and outputting this period, the maintenance company can know the range of time from the output of the damage warning to the output of the damage alarm. As a result, it becomes easier for the maintenance company to plan the cleaning of the fire detectors.

[0009] Figure 1 shows an example of the relationship between the number of tests and the degree of contamination of the light-receiving window. The horizontal axis represents the number of tests, and the vertical axis represents the degree of contamination of the light-receiving window. In the example shown in the figure, the contamination rate exceeds 75% consecutively from the 5th to the 7th test. As a result, a contamination warning is issued after the 7th test.

[0010] Subsequently, the contamination rate consistently exceeded 85% from the Nth test to the N+2th test. As a result, a contamination alarm was triggered after the N+2th test.

[0011] In this embodiment, the period from when a contamination warning is issued after the 7th test until when a contamination alarm is issued after the N+2th test is measured.

[0012] In this embodiment, the period from when a damage warning is issued until it is no longer issued is measured. By measuring, accumulating, and outputting this period, the maintenance company can know the range of time from when a damage warning is issued until it is no longer issued.

[0013] This information is useful for maintenance companies that clean fire detectors before a contamination alarm is triggered. For example, if the measured period is one, two, or three weeks, such a maintenance company can know that if cleaning is done within three weeks at the latest, a contamination alarm will not be triggered. As a result, it becomes easier for maintenance companies to plan the cleaning of fire detectors.

[0014] Figure 2 shows another example of the relationship between the number of tests and the fouling of the light-receiving window. The horizontal axis represents the number of tests, and the vertical axis represents the fouling rate of the light-receiving window. In the example shown in the figure, the fouling rate continuously exceeds 75% from the 5th to the 7th test. As a result, a fouling warning is output after the 7th test.

[0015] After that, in the (N + 2)-th test, the fouling rate is below 75%. When cleaning is actually performed, the fouling rate becomes approximately 0%. As a result, the output of the fouling warning stops.

[0016] In this embodiment, the period from when a fouling warning is output after the 7th test until the output of the fouling alarm stops after the (N + 2)-th test is timed.

[0017] 1-2. Configuration Next, the configuration of this embodiment will be described. Figure 3 shows an example of a disaster prevention system 300 for tunnels according to this embodiment. The disaster prevention system 300 shown in the figure includes a plurality of fire detectors 301 installed for each tunnel, a disaster prevention receiving panel 302, and remote monitoring and control equipment 303.

[0018] Among these, the plurality of fire detectors 301 are installed for each detection section set in the tunnel 304 along the vehicle driving direction. Each fire detector 301 is a binocular flame detector and includes a right-side flame detection unit that monitors the detection section on the right side as seen from the device, and a left-side flame detection unit that monitors the detection section on the left side. Each fire detector 301 is installed near the boundary of the detection section and monitors two detection sections simultaneously. Therefore, one detection section is redundantly monitored by two fire detectors 301.

[0019] The right-side flame detection unit and the left-side flame detection unit each include a solar cell as an example of a short-wavelength detection element, a pyroelectric element as an example of a long-wavelength detection element, and a light-emitting element as an example of a light source for fouling detection.

[0020] Each fire detector 301 is connected to the fire prevention receiving panel 302 via a circuit, and when it detects a fire, it outputs a fire signal to the fire prevention receiving panel 302. The output fire signal includes information that identifies the direction of detection.

[0021] Each fire detector 301 also performs a contamination test. In this contamination test, the light-emitting element is made to emit light, which is then received by a solar cell via a light-receiving window, and contamination of the light-receiving window is detected based on the output signal of the solar cell.

[0022] In this process, the optical attenuation rate DL (=1-V / V0) of the light-receiving window is calculated using the initial output signal V0 of the solar cell when the light-receiving window is clean and the output signal V during the contamination test. The calculated optical attenuation rate DL is, in other words, the contamination rate. Each fire detector 301 notifies the disaster prevention receiving panel 302 of the calculated contamination rate.

[0023] The fire alarm receiving panel 302 is installed in the electrical room 305 near the entrance of the tunnel 304. The fire alarm receiving panel 302 is connected to the fire detector 301 via a circuit. When the fire alarm receiving panel 302 receives a fire signal from the fire detector 301, it controls the pump control panel (not shown) to start the fire pump (not shown). The fire alarm receiving panel 302 also identifies the water discharge section corresponding to the detection section where the fire was detected, and controls the signal converter (not shown) of the identified water discharge section to open the automatic valve. As a result, water is discharged in the identified water discharge section.

[0024] Furthermore, the disaster prevention receiving panel 302 is connected to the remote monitoring and control equipment 303 via a communication network. The disaster prevention receiving panel 302 receives control signals output from the remote monitoring and control equipment 303 and controls the pump control panel and automatic valve device (not shown). Therefore, the operator of the remote monitoring and control equipment 303 can manually control the water discharge.

[0025] The remote monitoring and control equipment 303 is installed in the tunnel control room 306, which is located away from the tunnel 304. The remote monitoring and control equipment 303 is connected to the disaster prevention receiving panel 302 via a communication network and transmits and receives signals with the disaster prevention receiving panel 302. For example, the remote monitoring and control equipment 303, in response to an operation by a monitor, outputs a signal to the disaster prevention receiving panel 302 to control a fire pump or automatic valve device.

[0026] Next, the disaster prevention receiving panel 302 will be explained in more detail with reference to Figure 4. Figure 4 shows an example of the configuration of the disaster prevention receiving panel 302. The disaster prevention receiver panel 302 includes a main memory device 401 such as RAM, an auxiliary storage device 402 such as an HDD, a processor 403 such as a CPU, an input / output interface 404, and a communication interface 405 such as a network card.

[0027] The disaster prevention receiver panel 302 also includes a display 406, an operation unit 407, and a speaker 408. These devices are each connected to an input / output interface 404.

[0028] The main memory 401 described above stores various programs. These programs are distributable via non-temporary storage media or networks such as the Internet. Furthermore, various functions are realized when the processor 403 executes these programs. The functions realized include the water discharge area identification unit 411, the pump control unit 412, the automatic valve control unit 413, the contamination rate acquisition unit 414, the alert output unit 415, the first timing unit 416, the first period output unit 417, the second timing unit 418, and the second period output unit 419. Each function will be described below.

[0029] The water discharge area identification unit 411 receives a fire signal output from the fire detector 301 and identifies the water discharge area corresponding to the detection area where the detector is installed. In doing so, the water discharge area identification unit 411 identifies the water discharge area by referring to terminal equipment information and water discharge pattern information, which will be described later.

[0030] The pump control unit 412 outputs a control signal to the pump control panel. Specifically, the pump control unit 412 receives a fire signal output from the fire detector 301 and outputs a start signal to the pump control panel. The pump control panel receives this start signal and starts the fire pump.

[0031] The pump control unit 412 outputs a start signal to the pump control panel when a start operation is performed on the operating unit 407, and also when a start signal is received from the remote monitoring and control equipment 303.

[0032] Furthermore, the pump control unit 412 outputs a stop signal to the pump control panel when a stop operation is performed on the operating unit 407 or when a stop signal is received from the remote monitoring and control equipment 303. The pump control panel stops the fire pump upon receiving this stop signal.

[0033] The automatic valve control unit 413 outputs a control signal for the automatic valve device to a signal converter (not shown). Specifically, the automatic valve control unit 413 receives a fire signal output from the fire detector 301 and outputs an open control signal for the automatic valve device to the signal converter of the water discharge compartment identified by the water discharge compartment identification unit 411. The signal converter receives this open control signal and opens the automatic valve of the corresponding automatic valve device.

[0034] Furthermore, the automatic valve control unit 413 outputs an open control signal to the manually specified signal converter when an open control operation is performed on the operating unit 407 or when an open control signal is received from the remote monitoring and control equipment 303.

[0035] Furthermore, the automatic valve control unit 413 outputs a closed control signal to a manually designated signal converter when a closed control operation is performed on the operating unit 407 or when a closed control signal is received from the remote monitoring and control equipment 303. The signal converter receives this closed control signal and closes the automatic valve of the corresponding automatic valve device.

[0036] The contamination rate acquisition unit 414 acquires the contamination rate of the light receiving window output from the fire detector 301.

[0037] The alert output unit 415 outputs a soiling alarm if the soiling rate acquired by the soiling rate acquisition unit 414 exceeds the soiling alarm level. The alert output unit 415 also outputs a soiling warning if the acquired soiling rate does not exceed the soiling alarm level but exceeds the soiling warning level. Soiling alarms and soiling warnings are displayed on the display 406.

[0038] The first timing unit 416 measures the period from when the alert output unit 415 outputs a warning of soiling until the soiling alarm is output.

[0039] The first period output unit 417 outputs the period measured by the first timing unit 416. This period is displayed on the display 406. Alternatively, the information for this period is transmitted to another device.

[0040] The second timing unit 418 measures the period from when the alert output unit 415 outputs a stain warning until the stain rate acquired by the stain rate acquisition unit 414 falls below the stain warning level. This period is, for example, the period from when the alert output unit 415 outputs a stain warning until the stain rate acquired by the stain rate acquisition unit 414 falls below the stain warning level and becomes approximately 0%.

[0041] The second period output unit 419 outputs the period measured by the second timing unit 418. This period is displayed on the display 406. Alternatively, the information for this period is transmitted to another device.

[0042] Next, we will describe the auxiliary storage device 402. The auxiliary storage device 402 stores terminal device information 421, water discharge pattern information 422, warning-to-alarm period information 423, and warning-to-no-warning period information 424.

[0043] Of these, terminal equipment information 421 is information indicating the installation area for the fire detector 301 and the automatic valve device. This information indicates the detection area for each of the left and right detection units of the fire detector 301, and the water discharge area for the automatic valve device. This information is set by the user of the disaster prevention receiving panel 302. The aforementioned water discharge area identification unit 411 identifies the installation area of ​​each terminal device by referring to this terminal equipment information 421.

[0044] The water discharge pattern information 422 is information that shows the correspondence between the detected area and the water discharge area. This water discharge pattern information 422 is set by the user of the disaster prevention receiving panel 302. The water discharge area identification unit 411 refers to this water discharge pattern information 422 to identify the water discharge area corresponding to the detected area where the fire was detected.

[0045] The notification-to-alarm period information 423 indicates the period measured by the first timing unit 416. This period is the time from when the damage notification is output until the damage alarm is output.

[0046] Specifically, this warning / alarm period information 423 consists of a set of identification information for the fire detector 301, the period measured for the detector by the first timing unit 416, and the date and time on which the period was recorded. This warning / alarm period information 423 is displayed on the display 406 by the first period output unit 417 in response to user operation of the disaster prevention receiving panel 302.

[0047] The "Notice to No Notice Period Information 424" indicates the period measured by the second timing unit 418. This period is from when the damage notice is output until the damage notice is no longer output.

[0048] This notice-to-no-notice period information 424 specifically consists of a set of identification information for the fire detector 301, the period measured for the detector by the second timing unit 418, and the date and time on which the period was recorded. This notice-to-no-notice period information 424 is displayed on the display 406 by the second period output unit 419 in response to user operation of the disaster prevention receiving panel 302.

[0049] 1-3.Operation 1-3-1. Firefighting Procedures Next, the fire extinguishing operation of the disaster prevention system 300 will be explained with reference to Figure 5. Figure 5 is a sequence diagram showing an example of the fire extinguishing operation 500.

[0050] First, a vehicle fire occurs inside tunnel 304, and when the fire detector 301 detects this fire (step 501), the detector outputs a fire signal to the disaster prevention receiving panel 302 (step 502). The pump control unit 412 of the disaster prevention receiving panel 302 receives this fire signal and outputs a start signal to the pump control panel (step 503). The pump control panel receives this start signal and starts the fire extinguishing pump (step 504). Once the fire extinguishing pump is started, it pressurizes the fire extinguishing water stored in the water tank and supplies it to the water supply piping.

[0051] Furthermore, the water discharge area identification unit 411 of the disaster prevention receiving panel 302 receives the above-mentioned fire signal and identifies the water discharge area corresponding to the detection area where the fire was detected (step 505). Next, the automatic valve control unit 413 of the disaster prevention receiving panel 302 outputs an open control signal to the automatic valve device to the signal converter of the water discharge area identified by the water discharge area identification unit 411 (step 506). The signal converter receives this open control signal and opens the automatic valve of the corresponding automatic valve device (step 507). As a result, water is discharged in a dispersed manner from the water spray heads installed in the identified water discharge area, thereby suppressing the fire and preventing its spread. The above is an explanation of fire extinguishing procedure 500.

[0052] If the fire is extinguished after the fire extinguishing operation 500 described above is performed, the monitor in the tunnel control room 306 will manually perform the restoration operation. Specifically, the monitor will operate the remote monitoring and control equipment 303 to stop the fire pump and close the automatic valve device.

[0053] 1-3-2. Period timing operation Next, the time-timing operation of the disaster prevention receiver panel 302 will be explained with reference to Figure 6. Figure 6 is a flowchart showing an example of the time-timing operation 600. The operation shown in the figure is performed for each fire detector 301.

[0054] First, the contamination rate acquisition unit 414 acquires the contamination rate of the light receiving window output from the fire detector 301 (YES in step 601). Then, the contamination rate acquisition unit 414 determines whether the acquired contamination rate is 85% or higher (step 602). If the result of this determination is that the contamination rate is 85% or higher (YES in step 602), the contamination rate acquisition unit 414 determines whether the count value of the contamination alarm counter is less than a predetermined value (for example, "3") (step 603). If the result of this determination is that the count value is not less than 3 (NO in step 603), the process returns to step 601. On the other hand, if the result of this determination is that the count value is less than 3 (YES in step 603), the contamination rate acquisition unit 414 increments the contamination alarm counter (step 604). Then, the contamination rate acquisition unit 414 determines whether the count value of the contamination alarm counter is greater than or equal to a predetermined value (i.e., "3") (step 605). If the result of this determination is not 3 or greater (NO in step 605), the process returns to step 601. On the other hand, if the result of this determination is 3 or greater (YES in step 605), the first timing unit 416 records the timing value of the warning-to-alarm period timer, associating it with the identification information of the fire detector 301 and the current date and time (step 606). The recorded timing value represents the period from when the damage warning is output until the damage alarm is output. The first timing unit 416 then resets the warning-to-alarm period timer (step 607). The process then returns to step 601.

[0055] If the result of the determination in step 602 is not 85% or more (NO in step 602), the soiling rate acquisition unit 414 resets the soiling alarm counter (step 608). The soiling rate acquisition unit 414 then determines whether the soiling rate is 75% or more (step 609). If the result of this determination is 75% or more (YES in step 609), the soiling rate acquisition unit 414 determines whether the count value of the soiling warning counter is less than a predetermined value (for example, "3") (step 610). If the result of this determination is not less than 3 (NO in step 610), the process returns to step 601. On the other hand, if the result of this determination is less than 3 (YES in step 610), the soiling rate acquisition unit 414 increments the soiling warning counter (step 611). The soiling rate acquisition unit 414 then determines whether the count value of the soiling warning counter is greater than or equal to a predetermined value (i.e., "3") (step 612). If the result of this determination is that the count value is not 3 or greater (NO in step 612), the process returns to step 601. On the other hand, if the result of this determination is that the count value is 3 or greater (YES in step 612), the first timing unit 416 starts timing the warning-to-alarm period timer (step 613). This warning-to-alarm period timer is used to measure the period from when a damage warning is output until a damage alarm is output.

[0056] Next, the second timing unit 418 starts timing the warning-to-no-warning period timer (step 614). This warning-to-no-warning period timer is used to measure the period from when a damage warning is output until when damage warnings are no longer output. Then the process returns to step 601.

[0057] If, as a result of step 609 above, the contamination rate is not 75% or more (NO in step 609), the second timing unit 418 determines whether the warning-to-no-warning period timer is currently timing (step 615). If, as a result of this determination, the warning-to-no-warning period timer is not currently timing (NO in step 615), the process returns to step 601. On the other hand, if, as a result of this determination, the warning-to-no-warning period timer is currently timing (YES in step 615), the second timing unit 418 records the timing value of the warning-to-no-warning period timer, associating it with the identification information of the fire detector 301 and the current date and time (step 616). The recorded timing value represents the period from when the contamination warning is output until the contamination warning is no longer output. The second timing unit 418 then resets the warning-to-no-warning period timer (step 617). The process then returns to step 601. The above is an explanation of the period timing operation 600.

[0058] According to the time-measuring operation 600 described above, information on the fire detector 301 can be stored regarding the period from when a soiling warning is issued until a soiling alarm is issued, and information regarding the period from when a soiling warning is issued until the soiling warning is no longer issued. For the maintenance company, referring to this information makes it easier to plan the cleaning of the fire detector 301.

[0059] In the above-described time-delay operation 600, it is assumed that a contamination rate of 75% or higher is detected before detecting a contamination rate of 85% or higher. Therefore, in the above operation, when a contamination rate of 75% or higher is detected, the timer for the warning-to-alarm period and the timer for the warning-to-no-warning period are set to start. However, it is possible that a contamination rate of 85% or higher may be detected directly without going through the detection of a contamination rate of 75% or higher. To take such a case into consideration, the timer for the warning-to-alarm period and the timer for the warning-to-no-warning period may also be set to start when a contamination rate of 85% or higher is detected.

[0060] Specifically, the time-timing operation 600 is modified as follows. If the result of the determination in step 602 is that the contamination rate is 85% or higher (YES in step 602), the first timing unit 416 determines whether the warning-to-alarm period timer is currently timing. If the result of this determination is that the warning-to-alarm period timer is currently timing, the process proceeds to step 603. On the other hand, if the result of this determination is that the warning-to-alarm period timer is not currently timing, the first timing unit 416 starts timing the warning-to-alarm period timer, and the second timing unit 418 starts timing the warning-to-no-warning period timer. The process then returns to step 601.

[0061] 2. Variations The above embodiment may be modified as follows. The following modifications may be combined with each other.

[0062] (1) Defacement alarm level In the above example, a contamination alarm level of 85% is assumed. However, this value is merely an example, and any value can be set.

[0063] (2) Level of warning of damage In the above example, a soiling warning level of 75% is assumed. However, this value is merely an example, and any value lower than the soiling alarm level may be set.

[0064] (3) Arrangement of the timing unit and the period output unit In the above embodiment, the first timing unit 416, the first period output unit 417, the second timing unit 418, and the second period output unit 419 are located in the disaster prevention receiving panel 302. However, the disaster prevention receiving panel 302 is merely one example of where these functions can be located. These functions may also be located in another device that is communicated with the disaster prevention receiving panel 302.

[0065] (4) Unit for outputting period information In the above embodiment, it is assumed that each fire detector 301 outputs information on the period from warning to alarm and information on the period from warning to no warning. In this case, the maintenance company will check the information on the period from warning to alarm and information on the period from warning to no warning for each fire detector 301.

[0066] Alternatively, for each tunnel 304, information on the period from warning to alarm and information on the period from warning to no warning may be output. In this case, the maintenance company will be able to check the information on the period from warning to alarm and information on the period from warning to no warning for each tunnel 304.

[0067] In this case, the contamination rate acquisition unit 414 of the disaster prevention receiving panel 302 acquires the contamination rate of the light receiving window for each of the multiple fire detectors 301 installed in the same tunnel 304.

[0068] The first timing unit 416 measures the period for each of the multiple fire detectors 301 from when the alert output unit 415 outputs a contamination warning until the contamination alarm is output. The second timing unit 418 measures the period for each of the multiple fire detectors 301 from when the alert output unit 415 outputs a contamination warning until the contamination rate acquired by the contamination rate acquisition unit 414 falls below the contamination warning level. The timing methods for these two periods are as shown in the period timing operation 600 in Figure 6.

[0069] The disaster prevention receiving panel 302 further comprises a third period output unit and a fourth period output unit. The third period output unit calculates and outputs basic statistics based on the period measured for each of the multiple fire detectors 301 by the first timing unit 416. Meanwhile, the fourth period output unit calculates and outputs basic statistics based on the period measured for each of the multiple fire detectors 301 by the second timing unit 418. These basic statistics are displayed on the display 406. Alternatively, this basic statistics information is transmitted to another device.

[0070] For example, this basic statistical information may be shared among the disaster prevention receiving panels 302. In this case, the basic statistical information may be shared among the disaster prevention receiving panels 302 that share the same environmental conditions of the tunnels they manage (e.g., temperature, humidity, traffic volume, number of lanes, tunnel length, etc.). This allows the receiving device to estimate the basic statistical values ​​to be calculated by its own device by referring to the basic statistical values ​​of other devices, without having to calculate the basic statistical values ​​in its own device.

[0071] The sharing of basic statistics may be done via the remote monitoring and control equipment 303 or via a cloud server. Furthermore, the information shared is not limited to basic statistics; it may also include information on the warning-to-alarm period or the warning-to-no-warning period for individual fire detectors 301.

[0072] In this specification, basic statistics include measures of central tendency and measures of dispersion. Measures of central tendency include the mean, median, mode, maximum, and minimum, while measures of dispersion include variance and standard deviation.

[0073] For example, if the average is calculated and output, the maintenance company can find out the average of the warning-to-alarm period and the warning-to-no-warning period for multiple fire detectors 301 installed in tunnel 304.

[0074] As another example, if the minimum value is calculated and output, the maintenance company can find out the minimum values ​​for the warning-to-alarm period and the warning-to-no-warning period for multiple fire detectors 301 installed in tunnel 304.

[0075] (5) Units for outputting period information (Part 2) In the above embodiment, it is also possible to output information on the period from the notice to the alarm and information on the period from the notice to no notice for each of the multiple tunnels 304. In this case, the maintenance company will be able to check the information on the period from the notice to the alarm and information on the period from the notice to no notice for each of the multiple tunnels 304.

[0076] In this case, the contamination rate acquisition unit 414 of the disaster prevention receiving panel 302 acquires the contamination rate of the light receiving window for each of the multiple fire detectors 301 installed in the same tunnel 304. This process is performed in the disaster prevention receiving panel 302 of each tunnel 304. As a result, looking at the disaster prevention system 300 as a whole, the contamination rate is acquired for each of the multiple fire detectors 301 installed in different tunnels 304.

[0077] The first timing unit 416 measures the period for each of the multiple fire detectors 301 from when the alert output unit 415 outputs a contamination warning until the contamination alarm is output. The second timing unit 418 measures the period for each of the multiple fire detectors 301 from when the alert output unit 415 outputs a contamination warning until the contamination rate acquired by the contamination rate acquisition unit 414 falls below the contamination warning level. The timing methods for these two periods are as shown in the period timing operation 600 in Figure 6.

[0078] The timing by the first timing unit 416 and the timing by the second timing unit 418 are performed at the disaster prevention receiving panel 302 in each tunnel 304. As a result, when viewed as a whole, the disaster prevention system 300 will have two time periods measured for each of the multiple fire detectors 301 installed in different tunnels 304.

[0079] The remote monitoring and control equipment 303 includes a third period output unit and a fourth period output unit. The third period output unit acquires information on the period measured for each of the multiple fire detectors by the first timing unit 416 of each fire prevention receiving panel 302, and calculates and outputs basic statistics based on the acquired information. On the other hand, the fourth period output unit acquires information on the period measured for each of the multiple fire detectors 301 by the second timing unit 418 of each fire prevention receiving panel 302, and calculates and outputs basic statistics based on the acquired information. These basic statistics are displayed on the display 406. Alternatively, this basic statistics information is transmitted to other devices. The definition of basic statistics is as described above.

[0080] In this modified example, if the average is calculated and output, the maintenance company can find out the average of the warning-to-alarm period and the warning-to-no-warning period for multiple fire detectors 301 installed in multiple tunnels 304.

[0081] In the above explanation, it is assumed that the remote monitoring and control equipment 303 is equipped with a third period output unit and a fourth period output unit. However, instead of the remote monitoring and control equipment 303, these functions may be provided by a disaster prevention receiving panel 302 that monitors multiple tunnels 304, or by a device in the management office located between the remote monitoring and control equipment 303 and the disaster prevention receiving panel 302.

[0082] (6) Output value of the period output section The first period output unit 417 may output basic statistics for multiple periods recorded by the first timing unit 416 for a single fire detector 301. The definition of basic statistics is as described above.

[0083] For example, by outputting the average over multiple periods, the maintenance company can find out the average warning-to-alarm period for the fire detector 301.

[0084] Similarly, the second period output unit 419 may output basic statistics for multiple periods recorded by the second timing unit 418 for a single fire detector 301. The definition of basic statistics is as described above.

[0085] For example, by outputting the average over multiple periods, the maintenance company can find out the average for the fire detector 301 from the period with prior notice to the period without prior notice.

[0086] (7) Other variations It should be noted that the present invention is not limited to the embodiments described above, and various modifications are included. For example, the embodiments described above are described in detail to make the present invention easier to understand, and are not necessarily limited to those having all the configurations described. Furthermore, it is possible to replace parts of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add configurations from other embodiments to the configuration of one embodiment. In addition, it is possible to add, delete, or replace parts of the configuration of each embodiment with other configurations.

[0087] Furthermore, each of the above configurations, functions, processing units, and processing means may be implemented in hardware, either partially or entirely, by designing them as integrated circuits, for example. Alternatively, each of the above configurations and functions may be implemented in software by having the processor interpret and execute programs that implement each function. Information such as programs, tables, and files that implement each function can be stored in memory, a recording device such as a hard disk or SSD (Solid State Drive), or a recording medium such as an IC card, SD card, or DVD.

[0088] Furthermore, the control lines and information lines shown are those deemed necessary for explanatory purposes, and not all control lines and information lines are necessarily shown in the actual product. In reality, it is safe to assume that almost all components are interconnected. Furthermore, the above-described embodiments disclose at least the configuration described in the claims. [Explanation of symbols]

[0089] 300...Disaster prevention system, 301...Fire detector, 302...Disaster prevention receiving panel, 303...Remote monitoring and control equipment, 304...Tunnel, 305...Electrical room, 306...Tunnel control room

Claims

1. A means for acquiring the degree of contamination of the light-receiving window of a fire detector, An alert output means that outputs a contamination alarm when the contamination rate obtained by the acquisition means exceeds the contamination alarm level, and outputs a contamination warning when the contamination rate does not exceed the contamination alarm level but exceeds the contamination warning level, A first timing means for timing the period from when the damage warning is output by the alert output means until the damage alarm is output, A first period output means that outputs the period measured by the first timing means, A disaster prevention system equipped with these features.

2. The acquisition means acquires the contamination rate of the light-receiving window for each of the multiple fire detectors installed in the same tunnel. The first timing means measures the period for each of the plurality of fire detectors from the time the contamination warning is output by the alert output means until the contamination alarm is output. The system further comprises a second period output means that calculates and outputs basic statistics based on the period measured for each of the plurality of fire detectors by the first timing means, The disaster prevention system according to claim 1.

3. The acquisition means acquires the contamination rate of the light-receiving window for each of the multiple fire detectors installed in different tunnels. The first timing means measures the period for each of the plurality of fire detectors from the time the contamination warning is output by the alert output means until the contamination alarm is output. The system further comprises a second period output means that calculates and outputs basic statistics based on the period measured for each of the plurality of fire detectors by the first timing means, The disaster prevention system according to claim 1.

4. A second timing means that measures the period from when the aforementioned contamination warning is output by the aforementioned alert output means until the contamination rate acquired by the acquisition means falls below the aforementioned contamination warning level, A third period output means that outputs the period measured by the second timing means, The disaster prevention system according to claim 1, further comprising:

5. The acquisition means acquires the contamination rate of the light-receiving window for each of the multiple fire detectors installed in the same tunnel. The second timing means measures, for each of the plurality of fire detectors, the period from when the contamination warning is output by the alert output means until the contamination rate acquired by the acquisition means falls below the contamination warning level. The system further comprises a fourth period output means that calculates and outputs basic statistics based on the period measured for each of the plurality of fire detectors by the second timing means, The disaster prevention system according to claim 4.

6. The acquisition means acquires the contamination rate of the light-receiving window for each of the multiple fire detectors installed in different tunnels. The second timing means measures, for each of the plurality of fire detectors, the period from when the contamination warning is output by the alert output means until the contamination rate acquired by the acquisition means falls below the contamination warning level. The system further comprises a fourth period output means that calculates and outputs basic statistics based on the period measured for each of the plurality of fire detectors by the second timing means, The disaster prevention system according to claim 4.

7. A means for acquiring the degree of contamination of the light-receiving window of a fire detector, An alert output means that outputs a contamination alarm when the contamination rate obtained by the acquisition means exceeds the contamination alarm level, and outputs a contamination warning when the contamination rate does not exceed the contamination alarm level but exceeds the contamination warning level, A timing means for timing the period from when the warning of soiling is output by the alert output means until the soiling rate acquired by the acquisition means falls below the warning level, A period output means that outputs the period measured by the aforementioned timing means, A disaster prevention system equipped with these features.

8. The period measured by the timing means is the period from when the alert output means outputs the stain warning until the stain rate acquired by the acquisition means is less than or equal to the stain warning level and approximately 0%. The disaster prevention system according to claim 7.

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