JP7611972B2 - Disaster Prevention System - Google Patents

Description

The present invention relates to a disaster prevention system that monitors abnormalities inside a tunnel by connecting terminal devices such as fire detectors installed inside the tunnel to a disaster prevention receiving panel.

Traditionally, emergency facilities have been installed in tunnels on expressways and other roads to protect people and vehicles from fires that may occur inside the tunnel.

Such emergency facilities include fire detectors, manual reporting devices, and emergency telephones for monitoring and reporting fires, as well as fire hydrants for extinguishing fires and preventing the spread of fires, and water spray equipment that sprays fire-extinguishing water from water spray heads to protect the tunnel structure from fires. A tunnel disaster prevention system is created by installing a disaster prevention receiving panel that monitors and controls the terminal equipment of these emergency facilities.

Tunnel disaster prevention systems, consisting of disaster prevention receiving panels and terminal devices, are broadly divided into R-type transmission methods and P-type direct transmission methods. The R-type transmission method connects terminal devices such as fire detectors with addresses set to the transmission line, enabling individual management with detection and control on a terminal device basis through transmission control. The P-type direct transmission method divides the terminal devices into designated partition units according to their type, connects multiple terminal devices belonging to the same partition to the signal lines drawn out for each partition, and performs detection and control on a signal line basis.

Figure 8 is an explanatory diagram showing the line connection of terminal equipment to a disaster prevention receiving panel using a conventional P-type direct connection method. As shown in Figure 8, in tunnel 201, fire detectors 16 are installed at the boundaries of monitoring areas divided, for example, at 25 m or 50 m intervals along the longitudinal direction of the tunnel, and fire detectors 16 have detection areas on both the left and right sides, and adjacently placed fire detectors 16 redundantly monitor fires in the same monitoring area.

In addition, in the tunnel 201, fire hydrant devices are installed along the longitudinal direction of the tunnel, for example at intervals of 50 m. The fire hydrant devices are equipped with manual notification devices 20 known as transmitters, and are also equipped with fire hydrant switches 22, which are connected in parallel to a fire hydrant valve opening/closing switch that is turned on when the fire hydrant valve is opened by the fire hydrant valve opening/closing lever, and a pump start switch operated by the fire brigade.

In addition, automatic valve devices for water spray equipment that spray mist water from water spray heads to protect the tunnel structure from heat caused by fire are installed along the longitudinal direction of the tunnel at intervals of, for example, 50 m, and the automatic valve devices are equipped with water spray switches 24 that detect the start of water spraying due to remote operation of the automatic valves.

The disaster prevention receiving panel 200 is provided with partition boards 202-1 and 202-2, each of which is a section of a given length within the tunnel, for example 800 meters. The fire detectors 16, manual reporting devices 20, fire hydrant switches 22, and water spray switches 24 installed in the section from 0 to 800 meters from the tunnel entrance are connected on an equipment-by-equipment basis to the signal lines of signal lines 204-1, 206-1, 208-1, and 210-1, which are bundled by type and pulled out from the partition board 202-1.

Furthermore, the fire detectors 16, manual reporting devices 20, fire hydrant switches 22, and water spray switches 24 installed in the section 800 to 1600 meters from the tunnel entrance are connected on an equipment-by-equipment basis to the signal lines of the signal line groups 204-2, 206-2, 208-2, and 210-2 that are bundled and pulled out by type from the partition board 202-2.

JP 2002-246962 A Japanese Patent Application Publication No. 11-128381

However, in conventional tunnel disaster prevention systems in which a given length of the tunnel is treated as one section and multiple division boards are installed, if a division board fails due to deterioration or other reasons during long-term operation, there is a problem that it becomes impossible to monitor all of the terminal devices installed in the section of the tunnel corresponding to the failed division board.

In addition, when a partition board fails, it is necessary to replace the failed circuit board with a spare partition board. However, there are cases where the spare partition board prepared for failures does not function properly due to aging, etc., and replacing the failed circuit board takes time and effort, and during that time, it becomes impossible to monitor all of the terminal equipment installed in the section of the tunnel corresponding to the failed partition board.

To solve this problem, it would be possible to duplicate the partition boards and configure the system so that if one board fails during operation, it would switch to the spare board. However, as tunnels become longer, the number of partition boards increases, and duplicating the partition boards would significantly increase the installation space and costs, making this not a practical solution.

Furthermore, in conventional partition boards, a line receiving unit is provided for each signal line from a terminal device. If fire detectors, manual reporting devices, fire hydrant switches, and water spray switches are installed at 50 meter intervals in an 800 meter section, a large number of circuits, such as 100 circuits, are required as line receiving units, which increases the circuit scale of the partition board, leading to increased costs, and the large number of circuits in the line receiving units also increases the frequency of malfunctions.

The present invention aims to provide a disaster prevention system that prevents the loss of monitoring functions of terminal equipment due to failures in multiple division boards installed corresponding to sections of a specified length within a tunnel, and that makes it possible to reduce the circuit scale of the division board even if there are a large number of lines from the terminal equipment.

(Tunnel disaster prevention system)
The present invention is a disaster prevention system in which a terminal device is connected to each of a plurality of lines connected to a disaster prevention receiving panel, and signals from the terminal devices are received on a line-by-line basis,
a line selection means for sequentially selecting lines and outputting the previous signal input from a terminal device connected to the selected line;
a receiving means for receiving a signal output from the line selecting means;
A control means for instructing a predetermined control target to perform a predetermined control;
having
The line selection means is
a first line selection unit that selects and outputs a signal input from a terminal device that belongs to any one of a plurality of groups into which terminal devices are divided;
a second line selection unit that selects and outputs a signal input from a terminal device that belongs to another group among the plurality of groups;
Equipped with
The receiving means is
a first line receiving unit that normally receives a signal from the first line selecting unit and is also capable of receiving a signal from the second line selecting unit when a predetermined event occurs;
a second line receiving unit that normally receives a signal from the second line selecting unit and is also capable of receiving a signal from the first line selecting unit when a predetermined event occurs;
The present invention is characterized by comprising:

( Maintaining fire monitoring function when the line receiving unit fails )
The control means includes:
when the function of the first line receiving unit is lost as a predetermined event, if the second line receiving unit receives from the first line selecting unit a predetermined signal indicating an event related to abnormality detection, the second line receiving unit instructs a predetermined control target of the group corresponding to the first line selecting unit to perform a predetermined control corresponding to the received predetermined signal, and if the second line receiving unit receives from the second line selecting unit a predetermined signal, the second line receiving unit instructs a predetermined control target of the group corresponding to the second line selecting unit to perform a predetermined control corresponding to the received predetermined signal;
When the function of the second line receiving unit is lost as a specified event, if the first line receiving unit receives a specified signal from the first line selecting unit indicating an event related to abnormality detection, it instructs a specified control object of the group corresponding to the first line selecting unit to perform a specified control in response to the received specified signal, and if the first line receiving unit receives a specified signal from the second line selecting unit , it instructs a specified control object of the group corresponding to the second line selecting unit to perform a specified control in response to the received specified signal.

(Switching output destination)
The control means includes:
When the function of the first line receiving unit is lost, the output destination of the first line selecting unit is switched to the second line receiving unit;
If the function of the second line receiving section is lost, the output destination of the second line selecting section is switched to the first line receiving section.

(Basic Effects)
The present invention relates to a disaster prevention system in which terminal devices installed in a tunnel are connected to lines drawn from a disaster prevention receiving panel, and which receives and controls signals from the terminal devices or a block including a plurality of terminal devices on a line-by-line basis, the system comprising: line selection means for sequentially selecting lines and outputting a signal input from a terminal device connected to the selected line; receiving means for receiving a signal output from the line selection means; and control means for instructing a predetermined control target to perform a predetermined control. The line selection means comprises a first line selection unit for selecting and outputting a signal input from a terminal device belonging to any one of a plurality of groups into which the terminal devices are divided, and a second line selection unit for selecting and outputting a signal input from a terminal device belonging to another group out of the plurality of groups. The receiving means comprises a first line receiving unit for receiving a signal from the first line selection unit, and a second line receiving unit for receiving a signal from the second line selection unit. The control means switches the output destination of the first line selection unit to the second line receiving unit when the first line receiving unit receives a predetermined signal from the first line selecting unit, and in a state in which the switching has been performed, the second line receiving unit receives the same predetermined signal as that received by the first line receiving unit. When a predetermined signal is received from the second line selection unit, the output destination of the second line selection unit is switched to the first line reception unit, and when the same predetermined signal as that received by the second line reception unit is received by the first line reception unit in the switched state, the predetermined control is instructed to the predetermined control object to perform a predetermined control in accordance with the received predetermined signal. Therefore, if either the first line reception unit or the second line reception unit provided on the partition board, for example the first line reception unit, breaks down, The output of the first line selection unit is switched to the second line receiving unit, and following the selection and output of the line signal to the second line receiving unit by the second line selection unit, the first line selection unit on the faulty partition board side selects and outputs the line signal from the terminal equipment on the faulty side to the normal second line receiving unit.By repeating the selection and output of the second line selection unit to the normal second line receiving unit and the subsequent selection and output of the first line selection unit, the time required to select signals from multiple terminal equipment increases, but the terminal equipment monitoring function is not lost, and high redundancy is obtained in monitoring the terminal equipment for failures in the partition board.

In addition, since the selected output of the line selection means is input sequentially to the first line receiving unit and the second line receiving unit provided on each partition board, it is only necessary to provide one circuit corresponding to the first line receiving unit and the second line receiving unit on the partition board, which significantly reduces the circuit scale of the partition board, reduces costs and frequency of failures, and ensures high reliability.

(Effect of the line selection unit equipped with the line selection circuit)
Moreover, the first line selection unit includes a first selection circuit which receives signals from a plurality of terminal devices belonging to one group and selects and outputs the received signals, and the second line selection unit includes a second selection circuit which receives signals from a plurality of terminal devices belonging to another group and selects and outputs the received signals, and the control means switches the output destination of the first selection circuit to the second line reception unit when the first line reception unit receives a predetermined signal from the first selection circuit, and when the second line reception unit receives the same predetermined signal as that received by the first line reception unit with the switching being performed, instructs a predetermined control object to perform a predetermined control according to the received predetermined signal, and when the second line reception unit receives a predetermined signal from the second line selection circuit, switches the output destination of the second line selection circuit to the second line reception unit. The system is designed to switch to one line receiving unit, and when the first line receiving unit receives the same specified signal as that received by the second line receiving unit with the switching performed, it instructs a specified control corresponding to the specified signal received by a specified control object.Therefore, if either the first or second line receiving unit provided on the partition board, for example the first line receiving unit, fails, the output of the first selection circuit is switched to the second line receiving unit, and following the selection and output of the line signal to the second line receiving unit by the second selection circuit, the first selection circuit on the failed partition board side selects and outputs the line signal from the terminal equipment on the failed side to the normal second line receiving unit, so that the terminal equipment monitoring function is not lost due to a failure of the partition board, and high redundancy is obtained in monitoring the terminal equipment.

(Effect of line selection means having a main selection circuit and a sub selection circuit)
The first line selection unit includes a first main selection circuit which receives signals from a plurality of terminal devices belonging to one group and selects and outputs the input signals, and a first sub-selection circuit which receives each signal input to the first main selection circuit and selects and outputs the input signals. The second line selection unit includes a second main selection circuit which receives signals from a plurality of terminal devices belonging to another group and selects and outputs the input signals, and a second sub-selection circuit which receives each signal input to the second main selection circuit and selects and outputs the input signals. The control means switches the output of the first sub-selection circuit to the second line reception unit when the first line reception unit receives a predetermined signal from the first main selection circuit, and when the second line reception unit receives the same predetermined signal as that received by the first line reception unit with the switching performed, instructs a predetermined control object to perform a predetermined control corresponding to the received predetermined signal, and when the second line reception unit receives a predetermined signal from the second main selection circuit, controls the second sub-selection circuit when the second line reception unit receives a predetermined signal from the second main selection circuit. The output of the selection circuit is switched to the first line receiving unit, and when the first line receiving unit receives the same specified signal as that received by the second line receiving unit with this switching performed, it instructs a specified control corresponding to the specified signal received by a specified control object.As a result, in addition to the effect that the terminal equipment monitoring function is not lost due to a failure of the first line receiving unit or the second line receiving unit provided on the partition board, if, for example, a failure of the first main selection circuit of the first line selection unit causes the first line selection unit to no longer normally obtain signals from the terminal equipment, the output of the first sub-selection circuit is switched to the second line receiving unit, and following the selection and output of the line signal to the second line receiving unit by the second main selection circuit, the signal from the terminal equipment input to the failed first main selection circuit is selected and output by the first sub-selection circuit to the normal second line receiving unit.Although the time required to select signals from multiple terminal devices increases, the terminal equipment monitoring function is not lost, and high redundancy in monitoring of the terminal equipment is obtained even in the event of a failure of the partition board.

(Effect of AND judgment of terminal signals)
In addition, the control means switches the output of the first line selection unit to the second line receiving unit when a specified signal is received at the first line receiving unit due to the output from the first line selection unit, and when the same specified signal as that received by the first line receiving unit is received by the second line receiving unit, it instructs a specified control object to control based on the received specified signal.Therefore, when a line signal is received from a line that is the first line receiving unit, it is possible to confirm that a line signal is obtained from the same line at the second line receiving unit and to instruct control corresponding to that line signal, thereby preventing malfunction due to reception of a line signal and improving reliability.

The AND judgment of the terminal signal may be configured by switching the first line selection unit and the second line selection unit. That is, when a predetermined signal is received by the second line receiving unit due to the output from the second line selection unit, the control means switches the output of the second line selection unit to the first line receiving unit, and when the same predetermined signal as that of the second line receiving unit is received by the first line receiving unit, it instructs the predetermined control target to control based on the received predetermined signal. Therefore, when a line signal is received from a line that is the second line receiving unit, it is possible to confirm that a line signal is obtained from the same line in the first line receiving unit and instruct control corresponding to that line signal, thereby preventing malfunction due to reception of a line signal and improving reliability.

(Effect of AND Determination by Switching Between Main Selection Circuit and Sub Selection Circuit)
In addition, the control means switches the output of the first sub-selection circuit to the second line receiving section when a predetermined signal is received at the first line receiving section through the output from the first main selection circuit, and when the same predetermined signal as that received by the first line receiving section is received at the second line receiving section, it instructs a predetermined control object to control based on the received predetermined signal.Therefore, when a line signal from the line that is the first line receiving section is received through the output of the first main selection circuit, it is possible to switch the output of the first sub-selection circuit to the second line receiving section, confirm that a line signal is obtained from the same line, and instruct control corresponding to that line signal, thereby preventing malfunction due to reception of a line signal and improving reliability.

The AND determination by switching between the main selection circuit and the sub-selection circuit may be configured to switch the first line selection unit and the second line selection unit. That is, when a predetermined signal is received by the second line receiving unit through the output from the second main selection circuit, the control means switches the output of the second sub-selection circuit to the first line receiving unit, and when the same predetermined signal as that of the second line receiving unit is received by the first line receiving unit, the control means instructs the predetermined control target to control based on the received predetermined signal. Therefore, when a line signal is received from the line that is the second line receiving unit through the output of the second main selection circuit, the output of the second sub-selection circuit can be switched to the first line receiving unit to confirm that a line signal is obtained from the same line, and control corresponding to that line signal can be instructed, thereby preventing malfunction due to reception of a line signal and improving reliability.

(AND judgment of fire detection signal)
In addition, the control means instructs a specified control object to perform specified fire alarm control when a fire reception signal from a fire detector is received by the first line receiving unit and the second line receiving unit via the same signal line.As a result, when a fire detection signal is received from a fire detector, passage through the tunnel is blocked to deal with the fire. Therefore, if a false alarm from the fire detector causes passage through the tunnel to be blocked, it will take time to restore passage, resulting in significant social and economic losses.However, when a fire detection signal from the fire detector is received by both the first line receiving unit and the second line receiving unit, control corresponding to the fire detection is performed, which reduces the reception of fire detection signals due to false alarms and increases the reliability of fire monitoring.

(Effects by type of terminal device)
In addition, the terminal equipment is at least one of fire detectors, manual reporting devices, fire hydrant switches or water spray switches installed at predetermined intervals along the length of the tunnel. Therefore, the terminal equipment including fire detectors, manual reporting devices, fire hydrant switches or water spray switches installed in the tunnel are divided, for example, into two groups based on a predetermined length of the tunnel, and the fire detectors are connected in line units to the first line selection unit and the second line selection unit, while the other terminal equipment is connected in parallel by signal lines in units of a predetermined number of blocks. For example, even if the first line receiving unit to which the output of the first line selection unit is input breaks down, the output of the first line selection unit is switched to the input of the second line receiving unit. Therefore, even if the partition board on which the first line receiving unit is provided or the partition board on which the second line receiving unit is provided breaks down, the monitoring function by the fire detectors, manual reporting devices, fire hydrant switches or water spray switches is not lost, and high redundancy and reliability are ensured.

An explanatory diagram showing the overview of the tunnel disaster prevention system Block diagram showing the circuit board configuration of the disaster prevention receiving panel along with the terminal line connections Block diagram showing the outline of the functional configuration of the tunnel disaster prevention system FIG. 4 is a block diagram showing an embodiment of the line receiving unit and line switching unit shown in FIG. FIG. 4 is a block diagram showing another embodiment of the line receiving unit and the line switching unit shown in FIG. FIG. 6 is a block diagram showing line reception control when the first line reception unit of FIG. 5 fails. FIG. 6 is a block diagram showing line reception control when the second line reception unit of FIG. 5 fails. An explanatory diagram showing the line connection of terminal equipment to a disaster prevention receiving panel using a conventional P-type direct connection method.

[Outline of tunnel disaster prevention system]
The tunnel disaster prevention system is explained in detail in Fig. 1. As shown in Fig. 1, an up line tunnel 1a and an down line tunnel 1b are constructed as tunnels for a motorway. The up line tunnel 1a and the down line tunnel 1b are connected by an evacuation tunnel 2.

Inside the up-bound tunnel 1a and the down-bound tunnel 1b, fire detectors 16 functioning as terminal devices are installed along the walls in the longitudinal direction of the tunnels, for example at intervals of 50 meters. The fire detectors 16 set monitoring areas on both sides, 50 meters to the left and right, and sound a fire alarm when they detect flames caused by a fire.

In addition, inside the up-bound tunnel 1a and the down-bound tunnel 1b, fire hydrant devices 18 and automatic valve devices 23 are installed, for example, at intervals of 50 meters along the walls of the guard passage in the longitudinal direction of the tunnel. The fire hydrant devices 18 are equipped with manual reporting devices 20 and fire hydrant switches 22 that function as terminal devices.

The fire hydrant device 18 has a hose with a nozzle stored inside the hydrant door. In the event of a fire, the hydrant door is opened to pull out the hose with the nozzle, and when the fire hydrant valve opening/closing lever is opened, fire water is discharged. In addition, the fire hydrant valve opening/closing detection switch is turned on to output a pump start signal and start the fire pump.

The fire hydrant device 18 is also provided with a fire extinguisher door, which houses a fire extinguisher. The fire hydrant device 18 is also provided with a water supply hydrant for use by the fire brigade, and is also provided with a pump start switch that outputs a pump start signal when operated by a fire brigade member. The fire hydrant valve open/close detection switch and the pump start switch are connected in parallel, and function as the fire hydrant switch 22 shown in the figure.

Furthermore, the fire hydrant device 18 is provided with a notification device door, and the notification device door is provided with a manual notification device 20 that functions as a transmitter. When the manual notification device 20 is operated, a fire notification signal is output to the disaster prevention receiving panel 10, and a response lamp is turned on by a response signal from the disaster prevention receiving panel 10.

In addition, inside the up-bound tunnel 1a and the down-bound tunnel 1b, automatic valve devices 23 for the water spray equipment are installed at intervals of, for example, 50 meters along the walls of the guard passage in the longitudinal direction of the tunnel. The automatic valve devices 23 open the main valve by remotely controlling the opening of an operating motorized valve, and spray fire-extinguishing water from multiple water spray heads installed in the longitudinal direction at the top of the tunnel wall to protect the tunnel structure from fire. The automatic valve devices 23 for the water spray equipment are equipped with water spray switches 24 as terminal devices that detect the start of water spraying from the water spray heads. The water spray switches 24 use pressure switches that detect the water spray pressure caused by the opening of the automatic valves and turn on.

A disaster prevention receiving panel 10 is installed in a monitoring center or the like to connect terminal devices such as fire detectors 16, manual reporting devices 20, fire hydrant switches 22, and water spray switches 24 installed in the tunnel to monitor for abnormalities inside the tunnel.

P-type signal lines 11, 12 are pulled out from the disaster prevention receiving panel 10 into the up-line tunnel 1a and the down-line tunnel 1b, and are connected to a fire detector 16, a manual reporting device 20, a fire hydrant switch 22, and a water spray switch 24 installed in the tunnels.

In this embodiment, the tunnel is divided into two groups, each of which has a predetermined length, for example 800 meters, and the fire detectors 16 in each group are connected to individual signal lines. The remaining manual reporting devices 20, fire hydrant switches 22, and water spray switches 24 are connected to signal lines that are drawn out for each block section, with each 800-meter section being divided into block sections of a predetermined length, for example 200 meters. In the following explanation, we will use an example in which the tunnel is 1600 meters long and divided into two sections.

Here, the P-type signal line is composed of a signal line and a common line, and the fire detector 16, manual notification device 20, fire hydrant switch 22, and water spray switch 24 send fire detection signals, fire notification signals, pump start signals, and water spray start signals to the disaster prevention receiving panel 10 by passing line current based on their respective activations.

Other emergency facilities for the tunnel include a fire pump system 25, ventilation system 28, warning display board system 30, radio rebroadcast system 32, TV monitoring system 34, lighting system 36, and IG satellite station system 38. Except for the IG satellite station system 38, which is connected by a data transmission line, the other equipment is individually connected to the disaster prevention receiving panel 10 by a P-type signal line group 14.

Here, the IG child station equipment 38 is a communication equipment that connects the disaster prevention receiving panel 10 and the remote management equipment 42 via the network 40. The ventilation equipment 28 is an equipment that gives energy to the air in the tunnel by operating a jet fan installed on the ceiling side of the tunnel to blow out air at a high speed, thereby creating a ventilation flow in the longitudinal direction of the tunnel.

The warning display board equipment 30 is equipment that notifies users inside the tunnel of the outbreak of a fire inside the tunnel, the start of water spraying, etc. by displaying it on an electronic display board. The radio rebroadcast equipment 32 is equipment that enables drivers and others inside the tunnel to receive information from the road administrator. The TV monitoring equipment 34 is equipment that is used to confirm the scale and location of a fire, activate the water spray equipment, and grasp the situation inside the tunnel when providing evacuation guidance. The lighting equipment 36 is equipment that drives and manages the lighting equipment inside the tunnel.

[Disaster prevention receiving panel board configuration]
Fig. 2 is a block diagram showing the board configuration of the disaster prevention receiving panel together with the terminal line connection. As shown in Fig. 2, the disaster prevention receiving panel 10 is provided with a control rack 46 and a partition rack 52. The control rack 46 is provided with a control CPU board 48 and a control CPU spare board 50, and the control CPU board is duplicated.

The partition rack 52 is provided with a partition CPU board 54 and a partition CPU spare board 56, and the partition CPU board is also duplicated. In addition, the partition rack 52 is provided with partition boards 60-1 and 60-2 corresponding to the terminal equipment of the two 800-meter sections of the up-bound tunnel 1a, and two partition boards 60-3 and 60-4 corresponding to the terminal equipment of the two 800-meter sections of the down-bound tunnel 1b.

A line switching board 64-1 is provided for the partition boards 60-1 and 60-2, and the terminal equipment installed in the up line tunnel 1a is connected to the line switching board 64-1 via the signal line group 11.

A line switching board 64-2 is provided for the partition boards 60-3 and 60-4, and the line switching board 64-2 is connected to the terminal equipment installed in the down line tunnel 1b via the signal line group 12. A P-type output board 62 is also provided in the partition rack 52.

The duplicated partition CPU board 54 and partition CPU spare board 56 are connected to the duplicated control CPU board 48 and control CPU spare board 50 via duplicated serial transmission paths 76, 78 such as RS-485. The duplicated partition CPU board 54 and partition CPU spare board 56 are also connected to partition boards 60-1 to 60-4 and P-type output board 62 via signal lines. The P-type output board 62 is connected to the external fire pump equipment 25, ventilation equipment 28, alarm display board equipment 30, radio rebroadcast equipment 32, TV monitoring equipment 34, and lighting equipment 36 shown in FIG. 1.

P-type signal lines 80-1, 82-1, 84-1, and 86-1 are pulled out from the line switching board 64-1 to the up-line tunnel 1a, and the fire detectors 16 are connected on a line-by-line basis, while the manual reporting devices 20, fire hydrant switches 22, and water spray switches 24 are connected on a block-by-block basis.

Here, there are 16 fire detectors 16 in one 800-meter section, and the other terminal equipment is divided into four 200-meter blocks over the 800 meters, so signal line groups 80-1 and 80-2 each have 16 lines, signal line groups 82-1 to 86-2 each have 4 lines, and signal line group 11 bundles 56 lines.

P-type signal circuit groups 80-3, 82-3, 84-3, 86-3 (56 circuits in total) are drawn from the circuit switching board 64-2 to the down line tunnel 1b, and the fire detectors 16 are connected on a circuit-by-circuit basis, while the manual reporting devices 20, fire hydrant switches 22, and water spray switches 24 are connected on a block-by-block basis.

In addition, the partition rack 52 is provided with a detector test board that sends a test signal to the fire detector 16 via a test signal line that serves as a jumper wiring, but this is not shown in the figure.

The disaster prevention receiving panel 10 is also provided with an operation display CPU board 65, to which an operation section 66 equipped with a touch panel and various operation switches and an audio section 68 equipped with a speaker are connected, and a display section 72 equipped with a liquid crystal display and various indicator lights is connected via a display control board 70. The disaster prevention receiving panel 10 is further provided with a serial CPU board 74, to which the IG child station equipment 38 shown in FIG. 1 is connected.

[Functional configuration of the disaster prevention receiving panel]
Fig. 3 is a block diagram showing an outline of the functional configuration of the tunnel disaster prevention system. As shown in Fig. 3, the disaster prevention receiving panel 10 is provided with a main control unit 90, which is a function realized by, for example, executing a program, and the hardware used is a computer circuit equipped with a CPU, memory, various input/output ports, etc., provided on the control CPU board 48 in Fig. 2.

When the main control unit 90 receives a fire detection signal from the fire detector 16 or a fire notification signal from the manual notification device 20, it performs a predetermined fire alarm control, and when it receives a pump start signal from the fire hydrant switch 22, it controls the start of the fire pump equipment 25. Furthermore, when it receives a water spray start signal from the water spray switch 24, it controls the alarm display board equipment 30 to display a warning not to enter the tunnel in conjunction with the start of water spraying.

A partition control unit 96 is provided for the main control unit 90. The partition control unit 96 is a function that is realized, for example, by executing a program. The hardware used is a computer circuit equipped with a CPU, memory, various input/output ports, etc., provided on the partition CPU board 54 in FIG. 2.

When the section control unit 96 receives a line signal from a terminal device installed inside the tunnel, it sends the type of line signal and the line number that identifies the received signal line to the main control unit 90, causing it to perform the specified control.

The main control unit 90 is provided with the functions of a sub-control unit corresponding to the control CPU spare board 50 in Figure 2, but this is not shown.

For the section control unit 96, two sets of line receiving units 102-1, 102-2, 104-1, 104-2, 106-1, 106-2, 108-1, 108-2 are provided in correspondence with two groups of fire detectors 16, manual reporting devices 20, fire hydrant switches 22, and water spray switches 24 that are divided into 800-meter sections of the up-bound tunnel 1a.

The line receiving units 102-1 to 108-2 receive signals output from the fire detectors 16, manual reporting devices 20, fire hydrant switches 22, and water spray switches 24, which are provided as terminal devices, on a line-by-line basis and output the received signals to the partition control unit 96. These received signals are then sent from the partition control unit 96 to the main control unit 90, where fire alarm control, pump start control, water spray alarm display control, etc. are performed.

In addition, two sets of line receivers 102-3, 102-4, 104-3, 104-4, 106-3, 106-4, 108-3, and 108-4 are provided for the section control unit 96 in correspondence with the fire detector 16, manual notification device 20, fire hydrant switch 22, and water spray switch 24 of the outbound tunnel 1b.

In the following description, the line receiving units 102-1, 104-1, 106-1, 108-1, 102-3, 104-3, 106-3, and 108-3 are referred to as first line receiving units, and the line receiving units 102-2, 104-2, 106-2, 108-2, 102-4, 104-4, 106-4, and 108-4 are referred to as second line receiving units.

The partition control unit 96 is provided with the functionality of a sub-partition control unit corresponding to the partition CPU spare board 56 in FIG. 2, but this is not shown.

The line switching units 100-1 to 100-8 input signal lines from the terminal devices in parallel, and repeatedly perform the operation of switching and scanning the line signals from the input lines in a predetermined order and selecting and outputting them. For example, the line switching unit 100-1 sequentially selects 16 line signals from the fire detector 16 via the signal line group 80-1 by switching and scanning, and inputs them to the first line receiving unit 102-1, and also sequentially selects 16 line signals from the fire detector 16 via the signal line group 80-2 by switching and scanning, and inputs them to the second line receiving unit 102-2.

In addition, if the first line receiving unit 102-1 fails, line signals from the 36 lines of the signal line groups 80-1 and 80-2 are selected and input in sequence to the normal second line receiving unit 102-2 to perform line switching to recover from the failure. Furthermore, if the second line receiving unit 102-2 fails, line signals from the 36 lines of the signal line groups 80-1 and 80-2 are selected and input in sequence to the normal first line receiving unit 102-1 to perform line switching to recover from the failure.

Details of line switching in the event of a failure in the first line receiving unit 102-1 or the second line receiving unit 102-2 will be explained later.

The main control unit 90 is provided with an audio unit 68, an operation unit 66, a display unit 72, a serial transmission unit 92, and a P-type output unit 94. Of these, the serial transmission unit 92 uses the serial CPU board 74 in FIG. 2, and the P-type output unit 94 uses the P-type output board 62 in FIG. 2.

[Countermeasures against failure of partition board]
FIG. 4 is a block diagram showing an embodiment of the line receiving unit and line switching unit shown in FIG. 3, taking the line receiving units 102-1 and 102-2 and line switching unit 100-1 shown in FIG. 3 as an example.

As shown in FIG. 4, the line switching unit 100-1 is provided with a first scanning circuit 112-1 that functions as a first line scanning unit, a second scanning circuit 112-2 that functions as a second line scanning unit, and further includes a changeover switch unit 114 and a line switching control unit 116.

The first scanning circuit 112-1 is connected to 16 fire detectors 16 belonging to group G1, which are located in the 0 to 800 meter section of the up-bound tunnel 1a, by each of the 16 signal lines included in the signal line group 80-1.

The second scanning circuit 112-2 is connected to 16 fire detectors 16 belonging to group G2, which are located in the 800-1600 meter section of the up-bound tunnel 1a, by each of the 16 signal lines included in the signal line group 80-2.

The first scanning circuit 112-1 and the second scanning circuit 112-2 have input terminals numbered 0 to n (where n=16), with input terminal number 0 being an unused terminal, and input terminals numbered 1 to n being individually connected to signal lines from the fire detectors 16 of groups G1 and G2.

The first scanning circuit 112-1 and the second scanning circuit 112-2 sequentially select input terminals numbered 0 to n by switching and scanning the switching segments indicated by the arrows, and selectively output the line signal input from the fire detector 16.

The first scanning circuit 112-1 and the second scanning circuit 112-2 are realized by a known scanning circuit or selector circuit that has multiple gate switches that are turned on and off by a line switching control signal from the outside.

The output of the first scanning circuit 112-1 is input to the first line receiving unit 102-1 provided on the partition board 60-1, and when the first line receiving unit 102-1 determines that a fire detection signal has been received from the line signal selected by the switching scanning of the first scanning circuit 112-1, it outputs a fire detection signal together with the line number indicating the fire detection line to the partition control unit 96 shown in Figure 3, causing it to perform fire alarm control. The fire detection line is determined by the first line receiving unit 102-1 based on the line switching control signal output from the line switching control unit 116 to the first scanning circuit 112-1 via the dotted line path.

The output of the second scanning circuit 112-2 is input to the second line receiving unit 102-2 provided on the partition board 60-2, and when the second line receiving unit 102-2 determines that a fire detection signal has been received from the line signal selected by the switching scanning of the second scanning circuit 112-2, it outputs a fire detection signal together with the line number indicating the fire detection line to the partition control unit 96 shown in Figure 3, causing it to perform fire alarm control. The second line receiving unit 102-2 determines the fire detection line based on the line switching control signal output from the line switching control unit 116 to the second scanning circuit 112-2 via the dotted line path.

(Line switching control during normal operation)
When there is no failure in the partition boards 60-1, 60-2 and the first line receiving unit 102-1 and the second line receiving unit 102-2 are normal, the line switching control unit 116 turns off the changeover switch unit 114 as shown in the figure, and repeatedly outputs line switching control signals in parallel to the first scanning circuit 112-1 and the second scanning circuit 112-2 to sequentially switch input terminals 0 to n at a predetermined period, causing the line signal selected by the switching scanning of the first scanning circuit 112-1 to be output to the first line receiving unit 102-1 and the line signal selected by the switching scanning of the second scanning circuit 112-2 to be output to the second line receiving unit 102-2.

The line switching control signal that the line switching control unit 116 outputs to the first scanning circuit 112-1 and the second scanning circuit 112-2 is, for example, a 4-bit line switching control signal indicating the input terminal number 0 to n, and the first scanning circuit 112-1 and the second scanning circuit 112-2 select and connect the input terminal by decoding the 4-bit line switching control signal.

The 4-bit line switching control signal from the line switching control unit 116 is input to the first line receiving unit 102-1 and the second line receiving unit 102-2, making it possible to determine the line number of the line signal selected and output from the first scanning circuit 112-1 and the second scanning circuit 112-2.

(Line switching control when partition board 60-1 fails)
When the function of the first line receiving unit 102-1 is lost due to a failure of the partition board 60-1, the line switching control unit 116 switches the output of the first scanning circuit 112-1 to the input of the second line receiving unit 102-2 by turning on the changeover switch unit 114, and outputs an all-zero 4-bit line switching control signal to the first scanning circuit 112-1 and the second scanning circuit 112-2 to fix them in a switched-connected state to the vacant terminal numbered 0.

In this state, the line switching control unit 116 outputs a line switching control signal to the second scanning circuit 112-2 to sequentially switch the input terminals numbered 1 to n, so that the line signal from the fire detector 16 in group G2 is selected and output to the second line receiving unit 102-2, and then switches to and fixes the free terminal numbered 0. Next, the line switching control signal is output to the first scanning circuit 112-1 to sequentially switch to the input terminals numbered 1 to n, so that the line signal from the fire detector 16 in group G1 is selected and output to the second line receiving unit 102-2 of the normal partition board 60-2 via the changeover switch unit 114, and then switches to and fixes the free terminal numbered 0. These operations are then repeated.

In this way, if the function of the first line receiving unit 102-1 is lost due to a failure of the partition board 60-1, a switching scan is performed to select the signal line from the second scanning circuit 112-2 and then the first scanning circuit 112-1, and the signal is input to the second line receiving unit 102-2 of the normal partition board 60-2. This prevents the fire monitoring function of the fire detectors 16 belonging to group G1 corresponding to the failed partition board 60-1 from being lost, and provides a high level of redundancy.

In this case, the selection period for the line signals of the fire detectors 16 belonging to groups G1 and G2 takes twice as long because the second scanning circuit 112-2 and the first scanning circuit 112-1 are switched and scanned in sequence. However, if the scanning period for 16 lines is, for example, 10 milliseconds per line, it is 160 milliseconds, and even if this is doubled, it is only 320 milliseconds, which is not a time delay that would cause a problem in fire monitoring.

(Line switching control when partition board 60-2 fails)
When the function of the second line receiving unit 102-2 is lost due to a failure of the partition board 60-2, the line switching control unit 116 switches the output of the second scanning circuit 112-2 to the input of the first line receiving unit 102-1 by turning on the changeover switch unit 114, and outputs an all-zero 4-bit line switching control signal to the first scanning circuit 112-1 and the second scanning circuit 112-2 to fix them in a switched-connected state to the vacant terminal numbered 0.

In this state, the line switching control unit 116 outputs a line switching control signal to the first scanning circuit 112-1 to switch to the input terminals numbered 1 to n, so that the line signals from the fire detectors 16 in group G1 are selected and output to the first line receiving unit 102-1, and then switches to and fixes the free terminal numbered 0. Next, the line switching control signal is output to the second scanning circuit 112-2 to switch to the input terminals numbered 1 to n, so that the line signals from the fire detectors 16 in group G2 are selected and output to the first line receiving unit 102-1 of the normal partition board 60-1 via the changeover switch unit 114, and then switches to and fixes the free terminal numbered 0, and these operations are repeated.

Even if the second line receiving unit 102-2 loses its function due to a failure of the partition board 60-2, a switching scan is performed to select the signal line in the order of the first scanning circuit 112-1 and the second scanning circuit 112-2, and the signal is input to the first line receiving unit 102-1 of the normal partition board 60-1. This ensures that the fire monitoring function of the fire detectors 16 belonging to group G2 corresponding to the failed partition board 60-2 is not lost, and high redundancy is achieved.

(Switching control of terminal devices other than fire detectors)
The line switching units 100-2, 100-3, and 100-4 provided in correspondence with the manual reporting device 20, fire hydrant switch 22, and water spray switch 24 arranged in the up-line tunnel 1a shown in Figure 3 are provided with the same configurations as the first scanning circuit 112-1, second scanning circuit 112-2, changeover switch unit 114, and line switching control unit 116 of the line switching unit 100-1 corresponding to the fire detector 16 shown in Figure 4.

In this case, the manual reporting device 20, the fire hydrant switch 22, and the water spray switch 24 are divided into 200 meter block sections, and four lines are provided for each 800 meter section, so the first and second scanning circuits switch and scan the input terminals numbered 0 to 4. However, if a scanning circuit that switches and scans the input terminals numbered 0 to 16, the same as the fire detector 16, is used, the manual reporting device 20, the fire hydrant switch 22, and the water spray switch 24 are included in groups G1 and G2, and each is provided with 16 lines. This allows the line switching units 100-2, 100-3, and 100-4 to be combined into one, and the first line receiving units 104-1, 106-1, and 108-1 to be combined into one, and the second line receiving units 104-2, 106-2, and 108-2 to be combined into one.

In addition, the line connections to the first scanning circuit and the second scanning circuit do not need to be standardized for each terminal device, and may be connected to allow for a mixture of different types of terminal devices.

In addition, in this embodiment, by providing the line switching units 100-1 to 100-8, it is possible to provide only one line receiving unit circuit in the first line receiving units 102-1, 102-3, 104-1, 104-3, 106-1, 106-3, 108-1, 108-3 and the second line receiving units 102-2, 102-4, 104-2, 104-4, 106-2, 106-4, 108-2, 108-4. Compared to the conventional line receiving units that were provided according to the number of lines, the circuit scale of the partition boards 60-1 to 60-4 shown in FIG. 2 can be significantly reduced.

(AND judgment of fire detection signal)
When there are no faults in the partition boards 60-1, 60-2 shown in FIG. 2 and the first line receiving unit 102-1 receives a first fire detection signal from a fire detector 16 belonging to group G1 and determines the line number to output based on the selection output from the first scanning circuit 112-1, the partition control unit 96 shown in FIG. 3 instructs the line switching control unit 116 to turn on the changeover switch unit 114 to switch the output of the first scanning circuit 112-1 to the input of the second line receiving unit 102-2, and outputs an all-zero 4-bit line switching control signal to the second scanning circuit 112-2 to fix the state in which the signal is switched and connected to the available terminal number 0.

In this state, the line switching control unit 116 outputs a line switching control signal to the first scanning circuit 112-1 to switch to the input terminals numbered 1 to n, again selecting and outputting the line signals from the fire detectors 16 in group G1, and inputting them to the second line receiving unit 102-2 via the changeover switch unit 114.

When the first line receiving unit 102-1 receives a second fire detection signal and outputs the line number, the partition control unit 96 compares the first and second line numbers, and if they match, determines that the fire detection signal has been AND received, confirms that a true fire detection signal has been received, and performs fire alarm control.

In addition, when the second line receiving unit 102-2 determines and outputs the first fire detection signal and line number from a fire detector 16 belonging to group G2 based on the selection output from the second scanning circuit 112-2, the partition control unit 96 instructs the line switching control unit 116 to turn on the changeover switch unit 114 to switch the output of the second scanning circuit 112-2 to the input of the first line receiving unit 102-1, and outputs an all-zero 4-bit line switching control signal to the first scanning circuit 112-1 to fix the state in which it is switched and connected to the vacant terminal numbered 0.

In this state, the line switching control unit 116 outputs a line switching control signal to the second scanning circuit 112-2 to switch to the input terminals numbered 1 to n, again selecting and outputting the line signals from the fire detectors 16 in group G2, and inputting them to the first line receiving unit 102-1 via the changeover switch unit 114.

When the second line receiving unit 102-2 receives a second fire detection signal and outputs the line number, the partition control unit 96 compares the first and second line numbers, and if the two match, determines that the fire detection signal has been AND received, confirms that a true fire detection signal has been received, and performs fire alarm control.

By determining the AND reception of such fire detection signals and controlling the fire alarm, if the fire detector temporarily outputs a fire detection signal due to a malfunction, the AND reception of the fire detection signal will not be performed, and traffic through the tunnel will not be blocked due to a false alarm, improving the reliability of fire monitoring.

The AND reception determination of line signals from terminal devices may also be performed for terminal devices other than fire detectors as necessary.

[Countermeasures for failure of partition board and line switching board]
FIG. 5 is a block diagram showing another embodiment of the line receiving unit and line switching unit shown in FIG. 3, taking the line switching unit 100-1 shown in FIG. 3 as an example, and is characterized in that the scanning circuit of the line switching unit is duplicated to enhance redundancy.

As shown in FIG. 5, the line switching unit 100-1 is provided with a first main scanning circuit 118-1 and a first sub-scanning circuit 120-1 that function as a first line switching unit, a second main scanning circuit 118-2 and a second sub-scanning circuit 120-2 that function as a second line switching unit, and further includes changeover switch units 114-1 and 114-2 and a line switching control unit 116.

The first main scanning circuit 118-1 is connected to 16 fire detectors 16 belonging to group G1, which are located in the 0-800 meter section of the up-bound tunnel 1a, by each of the 16 signal lines included in the signal line group 80-1. The inputs of the first main scanning circuit 118-1 are branched and input in parallel to the first sub-scanning circuit 120-1.

The second main scanning circuit 118-2 is connected to 16 fire detectors 16 belonging to group G2, which are located in the 800-1600 meter section of the up-bound tunnel 1a, by each of the 16 signal lines included in the signal line group 80-2. The input of the second main scanning circuit 118-2 is branched and connected in parallel to the second sub-scanning circuit 120-2.

The first main scanning circuit 118-1 and the second main scanning circuit 118-2 have input terminals numbered 0 to n (where n=16), with input terminal number 0 being an unused terminal, and input terminals numbered 1 to n being individually connected to signal lines from the fire detectors 16 of groups G1 and G2.

The first main scanning circuit 118-1 and the second main scanning circuit 118-2 sequentially select input terminals numbered 0 to n by switching and scanning the switching segments indicated by the arrows, and selectively output the line signal input from the fire detector 16.

The first sub-scanning circuit 120-1 and the second sub-scanning circuit 120-2 have input terminals numbered 0 to n (where n=16), with the input terminal numbered 0 being an unused terminal, and the input terminals numbered 1 to n being connected in parallel to the input terminals numbered 1 to n of the first main scanning circuit 118-1 and the second main scanning circuit 118-2.

The first sub-scanning circuit 120-1 and the second sub-scanning circuit 120-2 sequentially select input terminals numbered 0 to n by switching and scanning the switching segments indicated by the arrows, and selectively output the line signal input from the fire detector 16.

The output of the first main scanning circuit 118-1 is input to the first line receiving unit 102-1 provided on the partition board 60-1, and when the first line receiving unit 102-1 detects reception of a fire detection signal from the line signal selected by the first main scanning circuit 118-1, it outputs a fire detection signal together with the line number indicating the fire detection line to the partition control unit 96 shown in Figure 3, causing it to perform fire alarm control. The first line receiving unit 102-1 identifies the fire detection line based on the line switching control signal output from the line switching control unit 116 via the dotted line path.

The output of the second main scanning circuit 118-2 is input to the second line receiving unit 102-2 provided on the partition board 60-2, and when the second line receiving unit 102-2 detects reception of a fire detection signal from the line signal selected by the second main scanning circuit 118-2, it outputs a fire detection signal together with the line number indicating the fire detection line to the partition control unit 96 shown in FIG. 3, causing it to perform fire alarm control. The second main line receiving unit 102-2 identifies the fire detection line based on the line switching control signal output from the line switching control unit 116 via the dotted line path.

The output of the first sub-scanning circuit 120-1 is connected to the input of the second line receiving unit 102-2 via the changeover switch unit 114-1. The output of the second sub-scanning circuit 120-2 is connected to the input of the first line receiving unit 102-1 via the changeover switch unit 114-2.

(Line switching control during normal operation)
When the first line receiving unit 102-1 and the second line receiving unit 102-2 are normal, the line switching control unit 116 turns off the change-over switches 114-1, 114-2 as shown in the figure, and repeatedly outputs line switching control signals in parallel to the first main scanning circuit 118-1 and the second main scanning circuit 118-2 to sequentially switch input terminals 1 to n at a predetermined period, causing the line signal selected by the switching scanning of the first main scanning circuit 118-1 to be output to the first line receiving unit 102-1, and the line signal selected by the switching scanning of the second main scanning circuit 118-2 to be output to the second line receiving unit 102-2.

The line switching control signal that the line switching control unit 116 outputs to the first main scanning circuit 118-1 and the second main scanning circuit 118-2 is, for example, a 4-bit line switching control signal indicating the numbers 0 to n of the four input terminals, and the first main scanning circuit 118-1 and the second main scanning circuit 118-2 select and connect the input terminals by decoding the 4-bit line switching control signal.

The 4-bit line switching control signal from the line switching control unit 116 is also input to the first line receiving unit 102-1 and the second line receiving unit 102-2, making it possible to determine the line number corresponding to the input terminal number of the line signal selected and output from the first main scanning circuit 118-1 and the second main scanning circuit 118-2.

When the first line receiving unit 102-1 and the second line receiving unit 102-2 are normal, the first sub-scanning circuit 120-1 and the second sub-scanning circuit 120-2 may stop switching scanning while being fixed to the vacant terminal numbered 0, or may perform switching scanning in synchronization with the first main scanning circuit 118-1 and the second main scanning circuit 118-2.

(Line switching control when partition board 60-1 fails)
FIG. 6 is a block diagram showing line reception control when the first line receiving unit in FIG. 5 fails, in which operating parts are indicated by solid lines and non-operating parts are indicated by dotted lines, with the line switching control unit 116 omitted.

As shown in FIG. 6, when the function of the first line receiving unit 102-1 is lost due to a failure of the partition board 60-1, the line switching control unit 116 switches the output of the first sub-scanning circuit 120-1 to the input of the second line receiving unit 102-2 by turning on the changeover switch unit 114-1, and outputs an all-zero 4-bit line switching control signal to the first main scanning circuit 118-1 and the second sub-scanning circuit 120-2, fixing them to the vacant terminal numbered 0.

In this state, the line switching control unit 116 outputs a line switching control signal to the second main scanning circuit 118-2 to switch to the input terminals numbered 1 to n, so that the line signals from the fire detectors 16 in group G2 are selected and output to the second line receiving unit 102-2, and then switches to and fixes the vacant terminal numbered 0. Next, the line switching control signal is output to the first sub-scanning circuit 120-1 to switch to the input terminals numbered 1 to n, so that the line signals from the fire detectors 16 in group G1 are selected and output to the second line receiving unit 102-2 of the normal partition board 60-2 via the changeover switch unit 114-1, and then switches to and fixes the vacant terminal numbered 0, and these operations are repeated.

In this way, if the function of the first line receiving unit 102-1 is lost due to a failure of the partition board 60-1, a switching scan is performed to select the signal line in the order of the second main scanning circuit 118-2 and the first sub-scanning circuit 120-1, and the signal is input to the second line receiving unit 102-2 of the normal partition board 60-2. This prevents the fire monitoring function of the fire detectors 16 belonging to group G1 corresponding to the failed partition board 60-1 from being lost, and provides a high level of redundancy.

In this case, the selection period for the line signals of the fire detectors 16 belonging to groups G1 and G2 takes twice as long because the second main scanning circuit 118-2 and the first sub-scanning circuit 120-1 are switched and scanned in sequence, but this does not result in a time delay that is problematic for fire monitoring.

(Line switching control when partition board 60-2 fails)
FIG. 7 is a block diagram showing line reception control when the second line receiving unit in FIG. 5 fails, in which operating parts are indicated by solid lines and non-operating parts are indicated by dotted lines, with the line switching control unit 116 omitted.

As shown in FIG. 7, when the second line receiving unit 102-2 loses function due to a failure of the partition board 60-2, the line switching control unit 116 switches the output of the second sub-scanning circuit 120-2 to the input of the first line receiving unit 102-1 by turning on the changeover switch unit 114-2, and outputs an all-zero 4-bit line switching control signal to the first sub-scanning circuit 120-1 and the second main scanning circuit 118-2 to fix the state in which they are switched and connected to the vacant terminal numbered 0.

In this state, the line switching control unit 116 outputs a line switching control signal to the first main scanning circuit 118-1 to switch to the input terminals numbered 1 to n, so that the line signals from the fire detectors 16 in group G1 are selected and output to the first line receiving unit 102-1, and then switches to and fixes the terminal numbered 0 as an empty terminal. Next, the line switching control signal is output to the second sub-scanning circuit 120-2 to switch to the input terminals numbered 1 to n, so that the line signals from the fire detectors 16 in group G2 are selected and output to the first line receiving unit 102-1 of the normal partition board 60-1 via the changeover switch unit 114-2, and then switches to and fixes the terminal numbered 0 as an empty terminal, and these operations are repeated.

Even if the second line receiving unit 102-2 loses its function due to a failure of the partition board 60-2, a switching scan is performed to select the signal line in the order of the first main scanning circuit 118-1 and the second sub-scanning circuit 120-2, and the signal is input to the first line receiving unit 102-1 of the normal partition board 60-1. This ensures that the fire monitoring function of the fire detectors 16 belonging to group G2 corresponding to the failed partition board 60-2 is not lost, and a high level of redundancy is achieved.

(Line switching control when the first main scanning circuit 118-1 fails)
When the first main scanning circuit 118-1 of the line switching unit 100-1 fails, the line switching control unit 116 switches the output of the first sub-scanning circuit 120-1 to the input of the second line receiving unit 102-2 by turning on the changeover switch unit 114-1, just as when the partition board 60-1 fails and the first line receiving unit 102-1 loses its function, and outputs an all-zero 4-bit line switching control signal to the first main scanning circuit 118-1 and the second sub-scanning circuit 120-2 to fix them to the available terminal number 0.

In this state, the line switching control unit 116 outputs a line switching control signal to the second main scanning circuit 118-2 to switch to the input terminals numbered 1 to n, and selects and outputs the line signals from the fire detectors 16 of group G2 to the second line receiving unit 102-2, then switches and fixes it to the vacant terminal numbered 0, and then outputs a line switching control signal to the first sub-scanning circuit 120-1 to switch to the input terminals numbered 1 to n, and selects and outputs the line signals from the fire detectors 16 of group G1 to the second line receiving unit 102-2 of the normal partition board 60-2 via the changeover switch unit 114-1, then switches and fixes it to the vacant terminal numbered 0, and repeats these operations. As a result, even if the first main scanning circuit 118-1 fails, the monitoring function of the fire detectors 16 of group G1 is not lost.

(Line switching control when the second main scanning circuit 118-2 fails)
When the second main scanning circuit 118-2 of the line switching unit 100-1 fails, the line switching control unit 116 switches the output of the second sub-scanning circuit 120-2 to the input of the first line receiving unit 102-1 by turning on the changeover switch unit 114-2, just as when the partition board 60-2 fails and the second line receiving unit 102-2 loses its function, and outputs an all-zero 4-bit line switching control signal to the first sub-scanning circuit 120-1 and the second main scanning circuit 118-2, fixing them in a switched-connected state to the vacant terminal numbered 0.

In this state, the line switching control unit 116 outputs a line switching control signal to the first main scanning circuit 118-1 to switch to the input terminals numbered 1 to n, and selects and outputs the line signal from the fire detector 16 of group G1 to the first line receiving unit 102-1, then switches and fixes it to the vacant terminal numbered 0, and then outputs a line switching control signal to the second sub-scanning circuit 120-2 to switch to the input terminals numbered 1 to n, and selects and outputs the line signal from the fire detector 16 of group G2 to the first line receiving unit 102-1 of the normal partition board 60-1 via the changeover switch unit 114-2, then switches and fixes it to the vacant terminal numbered 0, and repeats these operations. As a result, even if the second main scanning circuit 118-2 fails, the monitoring function of the fire detector 16 of group G2 is not lost.

(Switching control of terminal devices other than fire detectors)
The line switching units 100-2, 100-3, and 100-4 provided in correspondence with the manual reporting device 20, fire hydrant switch 22, and water spray switch 24 arranged in the up-line tunnel 1a shown in Figure 3 are provided with the same configurations as the first main scanning circuit 118-1, first sub-scanning circuit 120-1, second main scanning circuit 118-2, second sub-scanning circuit 120-2, changeover switch units 114-1 and 114-2, and line switching control unit 116 of the line switching unit 100-1 corresponding to the fire detector 16 shown in Figure 5.

In this case, the manual reporting device 20, the fire hydrant switch 22, and the water spray switch 24 are divided into 200-meter block sections, and four lines are provided for each 800-meter section. Therefore, the first main scanning circuit, the first sub-scanning circuit, the second main scanning circuit, and the second sub-scanning circuit switch and scan the input terminals numbered 0 to 4. However, if a scanning circuit that switches and scans the input terminals numbered 0 to 16, the same as the fire detector 16, is used, the manual reporting device 20, the fire hydrant switch 22, and the water spray switch 24 are included in groups G1 and G2, and each is provided with 16 lines. This allows the line switching units 100-2, 100-3, and 100-4 to be combined into one, and the first line receiving units 104-1, 106-1, and 108-1 to be combined into one, and the second line receiving units 104-2, 106-2, and 108-2 to be combined into one.

In addition, the line connections to the first scanning circuit and the second scanning circuit do not need to be standardized for each type of terminal device, and may be connected to allow a mixture of different types of terminal devices.

(AND judgment of fire detection signal)
When there are no faults in the partition boards 60-1, 60-2 shown in FIG. 5 and the first line receiving unit 102-1 receives a first fire detection signal from a fire detector 16 belonging to group G1 and determines the line number to output based on the selection output from the first main scanning circuit 118-1, the partition control unit 96 shown in FIG. 3 instructs the line switching control unit 116 to turn on the changeover switch unit 114-1 to switch the output of the first main scanning circuit 118-1 to the input of the second line receiving unit 102-2, and outputs an all-zero 4-bit line switching control signal to the second main scanning circuit 118-2 to fix the state in which the signal is switched and connected to the available terminal number 0.

When the first line receiving unit 102-1 and the second line receiving unit 102-2 are normal, the first sub-scanning circuit 120-1 and the second sub-scanning circuit 120-2 either stop switching scanning while fixed to the vacant terminal numbered 0, or switch scanning in synchronization with the first main scanning circuit 118-1 and the second main scanning circuit 118-2.

In this state, the line switching control unit 116 outputs a line switching control signal to the first main scanning circuit 118-1 to switch to the input terminals numbered 1 to n, and selects and outputs the line signals from the fire detectors 16 in group G1, and inputs them to the second line receiving unit 102-2 via the changeover switch unit 114-1.

When the second line receiving unit 102-2 receives a second fire detection signal and outputs the line number, the partition control unit 96 compares the first and second line numbers, and if the two match, determines that the fire detection signal has been AND received, thereby confirming that a true fire detection signal has been received and performing fire alarm control.

In addition, when the second line receiving unit 102-2 receives a first fire detection signal from a fire detector 16 belonging to group G2 and determines and outputs the line number based on the selection output from the second main scanning circuit 118-2, the partition control unit 96 instructs the line switching control unit 116 to turn on the changeover switch unit 114-2 to switch the output of the second main scanning circuit 118-2 to the input of the first line receiving unit 102-1, and outputs an all-zero 4-bit line switching control signal to the second main scanning circuit 118-2 to fix the state in which it is switched and connected to the vacant terminal numbered 0.

In this state, the line switching control unit 116 outputs a line switching control signal to the second main scanning circuit 118-2 to switch to the input terminals numbered 1 to n, and selects and outputs the line signals from the fire detectors 16 in group G2, and inputs them to the first line receiving unit 102-1 via the changeover switch unit 114.

When the first line receiving unit 102-1 receives a second fire detection signal and outputs the line number, the partition control unit 96 determines that an AND reception has occurred, where the first and second line numbers match, and then performs fire alarm control.

In this way, the line switching unit 100-1 in Figure 5 also distinguishes between AND reception of a fire detection signal and performs fire alarm control. In the event that a fire detector temporarily outputs a fire detection signal due to a malfunction, for example, AND reception of the fire detection signal is not performed, and a false alarm that would block passage through the tunnel is prevented, thereby improving the reliability of fire monitoring.

The AND reception determination of line signals from terminal devices may also be performed for terminal devices other than fire detectors as necessary.

[Modifications of the present invention]
(Terminal Equipment)
The above embodiments take fire detectors, manual reporting devices, fire hydrant switches, and water spray switches as examples of terminal equipment connected to the partition board via signal lines, but are not limited to these and can also be applied to cases where the operation of any appropriate terminal equipment related to a fire, such as emergency telephone reporting operations, removal of a fire extinguisher, etc., is connected to the partition board as terminal equipment.

(others)
Furthermore, the present invention includes appropriate modifications that do not impair the objects and advantages of the present invention, and is not limited to the numerical values shown in the above embodiment.

1a: Up line tunnel 1b: Down line tunnel 10: Disaster prevention receiving panel 11, 12, 14: Signal line group 16: Fire detector 18: Fire hydrant device 20: Manual reporting device 22: Fire hydrant switch 23: Automatic valve device 24: Water spray switch 25: Fire pump equipment 28: Ventilation equipment 30: Alarm display board equipment 32: Radio rebroadcast equipment 34: TV monitoring equipment 36: Lighting equipment 38: IG child station equipment 40: Network 42: Remote management equipment 46: Control rack 48: Control CPU board 50: Control CPU spare board 52: Partition rack 54: Partition CPU board 56: Partition CPU spare board 60-1 to 60-4: Partition board 62: P-type output board 64-1, 64-2: Line switching board 65: Operation display CP U board 66: operation unit 68: audio unit 70: display control board 72: display unit 74: serial CPU boards 80-1 to 86-4: signal line group 90: main control unit 92: serial transmission unit 94: P-type output unit 96: partition control units 100-1 to 100-8: line switching units 102-1, 104-1, 106-1, 108-1: first line receiving unit 102-2, 104-2, 106-2, 108-2: second line receiving unit 112-1: first scanning circuit 112-2: second scanning circuit 114, 114-1, 114-2: changeover switch unit 116: line switching control unit 118-1: first main scanning circuit 118-2: second main scanning circuit 120-1: first sub-scanning circuit 120-2: second sub-scanning circuit

Claims (3)

A disaster prevention system in which a terminal device is connected to each of a plurality of lines connected to a disaster prevention receiving panel, and signals from the terminal devices are received on a line-by-line basis,
a line selection means for sequentially selecting the lines and outputting the signal input from the terminal device connected to the selected line;
a receiving means for receiving the signal output from the line selecting means;
A control means for instructing a predetermined control target to perform a predetermined control;
having
The line selection means
a first line selection unit that selects and outputs a signal input from a terminal device that belongs to any one of a plurality of groups into which the terminal devices are divided;
a second line selection unit that selects and outputs a signal input from the terminal device that belongs to another group among the plurality of groups;
Equipped with
The receiving means includes:
a first line receiving unit which normally receives a signal from the first line selecting unit and which is also capable of receiving a signal from the second line selecting unit when a predetermined event occurs;
a second line receiving unit which normally receives a signal from the second line selecting unit and which is also capable of receiving a signal from the first line selecting unit when a predetermined event occurs;
Equipped with
The control means
when the second line receiving unit receives a predetermined signal indicating an event related to abnormality detection from the first line selecting unit when the function of the first line receiving unit is lost as the predetermined event, the second line receiving unit instructs the predetermined control target of the group corresponding to the first line selecting unit to perform the predetermined control in response to the received predetermined signal, and when the second line receiving unit receives the predetermined signal from the second line selecting unit, the second line receiving unit instructs the predetermined control target of the group corresponding to the second line selecting unit to perform the predetermined control in response to the received predetermined signal;
A disaster prevention system characterized in that when the function of the second line receiving unit is lost as the specified event, if the first line receiving unit receives a specified signal from the first line selection unit indicating an event related to abnormality detection, the first line receiving unit instructs the specified control of the specified control object of the group corresponding to the first line selection unit to perform the specified control in response to the received specified signal, and if the first line receiving unit receives the specified signal from the second line selection unit , the first line receiving unit instructs the specified control of the specified control object of the group corresponding to the second line selection unit to perform the specified control in response to the received specified signal.
The disaster prevention system according to claim 1,
The control means
When the function of the first line receiving unit is lost, the output destination of the first line selecting unit is switched to the second line receiving unit;
A disaster prevention system characterized in that, when the function of the second line receiving unit is lost, the output destination of the second line selection unit is switched to the first line receiving unit.
The disaster prevention system according to claim 1 or 2,
The predetermined signal is
If the terminal device is a fire detector, the signal is a fire detection signal.
If the terminal device is a manual notification device, it is a fire notification signal,
If the terminal device is a fire hydrant switch, the signal is a pump start signal.
If the terminal device is a water spray switch, the water spray start signal is
The predetermined control is
When the predetermined signal is the fire detection signal or the fire notification signal, it is a fire alarm control;
When the predetermined signal is the pump start signal, it is a fire pump start control,
A disaster prevention system characterized in that, when the specified signal is the water spray start signal, a warning display control is performed.

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