JP2018092289A - Tunnel communication system, communication device, and communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tunnel communication system, communication device, and communication method capable of keeping a communicable state between a monitor device and terminals even when multiple defects occur in a wired communication line.SOLUTION: A tunnel communication system includes: multiple first communication devices arranged along a tunnel; a second communication device for monitoring the multiple first communication devices; and loop-shape wired communication lines for communicably connecting the multiple first communication devices to the second communication devices. Each one of the multiple first communication devices includes a first radio communication section. The second communication device includes a control section for guiding transmission of a response radio signal with respect to at least one of the multiple first communication devices when it is determined that multiple defects have occurred in the wired communication line.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a tunnel communication system, a communication apparatus, and a communication method.

  The purpose of the disaster prevention system for tunnels is to quickly and accurately grasp disasters such as fires in tunnels, notify road monitors, and carry out initial fire fighting activities to prevent the spread of damage caused by disasters. It is a system. For example, as an example of a tunnel disaster prevention system, the system disclosed in Patent Document 1 below can be cited.

  In such a disaster prevention system for a tunnel, various terminals such as a fire detector and a fire extinguishing device provided in the tunnel are monitored and controlled using a tunnel communication system. Since the disaster prevention system for tunnels is a safety-related system, it is required to be able to monitor and control various terminals under any circumstances. Therefore, the communication system for tunnels used in the disaster prevention system for tunnels is required to be maintained in a communicable state between the monitoring device and the terminal under any circumstances.

  For example, in the inventions disclosed in Patent Documents 2 and 3 below, the monitoring device and the terminal are communicably connected via a wired communication line. Even when a failure such as disconnection occurs on the wired communication line, the wired communication line is looped (a monitoring device and a monitoring device) in order to maintain a communicable state between the monitoring device and the terminal. The two terminals are connected to each other at the terminal farthest from the monitoring device, and these two lines are connected to each other at the terminal farthest from the monitoring device to form one closed communication line). According to the inventions disclosed in Patent Documents 2 and 3 below, even if a failure occurs on the wired communication line by configuring the wired communication line in a loop shape, the communication path on the wired communication line By making a detour so as to avoid a failure, the monitoring device and the terminal can be maintained in a communicable state.

  For example, in the invention disclosed in Patent Document 4 below, the monitoring device and the terminal (signal control device) are communicably connected via a plurality of wireless communication devices. Even when one of the plurality of wireless communication devices fails or when wireless communication using a signal of a specific frequency is not possible, another wireless communication device is used. Or by using signals of other frequencies, the monitoring device and the terminal can be maintained in a communicable state.

Japanese Patent Laid-Open No. 9-282576 JP 2008-011156 A JP-A-63-139442 Japanese Patent Laying-Open No. 2015-166217

  In communication systems used in conventional tunnel disaster prevention systems, long-distance communication in a closed space such as a tunnel is difficult, and communication conditions are easily affected by the environment, so wireless communication must be used. Rather, it is common to use wired communication using a looped wired communication line as described above. However, in wired communication using a looped wired communication line, when two or more failures occur on the wired communication line, it is not possible to secure a communication path that bypasses the failure. There is a problem that the monitoring device and the terminal cannot be maintained in a communicable state.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a connection between a monitoring device and various terminals even when a plurality of failures occur in a wired communication line. It is an object of the present invention to provide a new and improved tunnel communication system, communication apparatus, and communication method capable of maintaining a communication state.

  In order to solve the above problems, according to an aspect of the present invention, a plurality of first communication devices installed along a tunnel, and a second communication device that monitors the plurality of first communication devices, A loop-shaped wired communication line that connects the plurality of first communication devices and the second communication device so that they can communicate with each other, and each of the plurality of first communication devices includes a first wireless communication And when the second communication device determines that a plurality of failures have occurred in the wired communication line, a response wireless signal to at least one of the plurality of first communication devices There is provided a communication system for a tunnel having a control unit that guides the transmission of.

  The second communication device further includes a second wireless communication unit, and when the control unit determines that a plurality of failures have occurred in the wired communication line, the second wireless communication unit, Control may be performed so that at least one of the plurality of first communication devices transmits a monitoring wireless signal that induces transmission of the response wireless signal.

  The tunnel communication system may further include one or a plurality of amplifying devices that amplify a wired signal, and the amplifying device may be connected to the wired communication line and include a third wireless communication unit.

  When the control unit determines that a plurality of failures have occurred in the wired communication line, the control unit transmits an induction signal to the amplifying apparatus via the wired communication line, and Control may be performed so that at least one of the first communication devices transmits a monitoring wireless signal that induces transmission of the response wireless signal.

  The wired communication line includes a first line and a second line that connect the plurality of first communication devices and the second communication device, and an end of the first line and the second line. Are connected to each other, and the control unit determines whether the second communication device transmits a first monitoring wired signal to the plurality of first communication devices via the first line. A part of a plurality of first response wired signals that are responses to the first monitoring wired signal transmitted from the plurality of first communication devices via the first line within a time period. The second communication device is in a predetermined state after the second monitoring wired signal is transmitted to the plurality of first communication devices via the second line. The first communication device transmitted from the plurality of first communication devices via the second line within a time period. If it is not possible to receive a portion of the plurality of second response wireline signal which is a response to monitoring wired signal, it may determine that the wired communication line to a plurality of failure occurs.

  The monitoring wireless signal is other than the first communication device that has transmitted the first response wired signal or the second response wired signal that the second communication device has received within the predetermined time. May be transmitted to the first communication device.

  The first wireless communication unit may be a multi-hop wireless communication device.

  The plurality of first communication devices may be arranged with an interval shorter than a communicable distance of the multi-hop wireless communication device.

  The plurality of first communication devices may be arranged with a short interval compared to a half of the communicable distance of the multi-hop wireless communication device.

Each of the plurality of first communication devices may be connected to a fire detection device provided in the tunnel.

  In order to solve the above-mentioned problem, according to another aspect of the present invention, there is provided a monitoring device for monitoring a plurality of communication devices installed along a tunnel, wherein the monitoring device is connected via a looped wired communication line. When it is determined that a plurality of faults have occurred in the wired communication line and connected to a plurality of communication devices in a communicable manner, a response wireless signal is transmitted to at least one of the plurality of communication devices. A monitoring device comprising a control unit is provided.

  In order to solve the above problem, according to still another aspect of the present invention, a plurality of communication devices installed along a tunnel, wherein the communication devices are monitored via a looped wired communication line. A communication device is provided that is connected to a monitoring device so as to be communicable and includes a wireless communication unit that performs multi-hop wireless communication when a plurality of failures occur in the wired communication line.

  Furthermore, in order to solve the above-described problem, according to still another aspect of the present invention, a plurality of first communication devices installed along a tunnel and a second for monitoring the plurality of first communication devices. And a communication method for a tunnel including a loop-shaped wired communication line that connects the plurality of first communication devices and the second communication device in a communicable manner, The communication device transmits a monitoring wired signal to the plurality of first communication devices via the wired communication line, and the second communication device transmits the monitoring wired signal within a predetermined time. If a response wired signal to the monitoring wired signal from each of the first communication devices cannot be received via the wired communication line, at least one of the plurality of first communication devices Response wireless signal transmission Inducing, communication method comprising is provided.

  As described above, according to the present invention, it is possible to maintain a communicable state between the monitoring device and the terminal even when a plurality of failures occur in the wired communication line.

It is explanatory drawing which shows the outline | summary of the communication system 1 for tunnels concerning embodiment of this invention. It is explanatory drawing for demonstrating the case where one failure 100 arises on the wired communication line 8 of the communication system 1 for tunnels. It is explanatory drawing for demonstrating the case where several failure 100a, 100b has arisen on the wired communication line 8 of the communication system 1 for tunnels. It is explanatory drawing for demonstrating the detailed structure of the communication system 1 for tunnels which concerns on embodiment of this invention. It is explanatory drawing for demonstrating the structure of the monitoring apparatus 4 which concerns on embodiment of this invention. It is explanatory drawing for demonstrating the structure of the terminal connection apparatus 60 which concerns on embodiment of this invention. It is explanatory drawing for demonstrating the structure of the amplifier 66 which concerns on embodiment of this invention. It is explanatory drawing for demonstrating multihop type | mold radio | wireless communication. It is explanatory drawing for demonstrating the radio | wireless communication which concerns on embodiment of this invention. It is a flowchart of operation | movement of the communication system 1 for tunnels which concerns on embodiment of this invention. It is explanatory drawing (the 1) for demonstrating step S101 of FIG. 10, and step S103. It is explanatory drawing (the 2) for demonstrating step S101 and step S103 of FIG. It is explanatory drawing (the 1) for demonstrating step S105 and step S107 of FIG. It is explanatory drawing (the 2) for demonstrating step S105 and step S107 of FIG. It is explanatory drawing for demonstrating step S109 of FIG. It is explanatory drawing explaining step S111 and step S113 of the communication method which concerns on embodiment of this invention. It is explanatory drawing for demonstrating the communication system for tunnels 1a which concerns on the 1st modification of embodiment of this invention. It is explanatory drawing for demonstrating the structure of the monitoring apparatus 4a which concerns on the 2nd modification of embodiment of this invention.

  Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  In the present specification and drawings, a plurality of components having substantially the same functional configuration may be distinguished by adding different alphabets after the same reference numeral. For example, a plurality of configurations having substantially the same functional configuration or logical significance are distinguished as necessary, such as the terminal connection device 60a and the terminal connection device 60b. However, when it is not necessary to particularly distinguish each of a plurality of constituent elements having substantially the same functional configuration, only the same reference numerals are given. For example, when it is not necessary to distinguish between the terminal connection device 60a and the terminal connection device 60b, they are simply referred to as the terminal connection device 60.

<< Outline of configuration of communication system 1 for tunnel >>
The embodiment of the present invention can be applied to a tunnel communication system 1 used in a tunnel disaster prevention system in a tunnel 2 provided on a road 12 or a railway. First, with reference to FIG. 1, the outline | summary of a structure of the communication system 1 for tunnels based on embodiment of this invention is demonstrated. FIG. 1 is an explanatory diagram showing an overview of a tunnel communication system 1 according to the present embodiment. The communication system 1 for a tunnel according to the present embodiment quickly and accurately grasps a disaster such as a fire that has occurred in the tunnel 2, notifies a road supervisor, and implements an initial fire fighting activity. It is a communication system for the disaster prevention system for tunnels which performs the operation | movement which prevents the expansion of damage. Therefore, as described above, the tunnel communication system 1 is not limited to various types of fire detectors (fire detection devices) 14 and fire extinguishing devices 16 provided in the tunnel 2 under any circumstances. It is required that the monitoring device 4 and the terminal are always maintained in a communicable state so that the terminal can be monitored and controlled by the monitoring device (second communication device) 4.

  As shown in FIG. 1, the tunnel communication system 1 includes various terminals such as a fire detector 14 and a fire extinguishing device 16 provided in a tunnel 2 on a road 12 (specifically, an up line 12a and a down line 12b). A monitoring device 4 for monitoring the above, a plurality of connection devices 6 connected to these terminals and transmitting signals (specifically, the terminal connection device 60 and the amplification device 66), the monitoring device 4 and the connection device 6 And a loop-like wired communication line 8 that is communicably connected to each other. Below, the various apparatuses contained in the communication system 1 for tunnels of this embodiment are demonstrated.

(Monitoring device 4)
The monitoring device 4 is installed, for example, in the tunnel entrance or the ventilator communication machine room above the tunnel 2, and monitors various terminals (fire detector 14, fire extinguishing device 16, etc.) in the tunnel 2 through the connection device 6 described later. ,Control. For example, when the monitoring device 4 receives a notification that the detection state of the fire detector 14 has changed, such as when the fire detector 14 detects a fire, the monitoring device 4 detects it to the road administrator of the centralized monitoring center (not shown). Notify about changes in state. Further, when the road monitor performs an operation to extinguish the fire extinguishing device 16 or the like in response to the notification, the monitoring device 4 transmits a control signal based on the operation to the fire extinguishing device 16.

(Connecting device 6)
A plurality of connection devices 6 are installed along the up road 12a and the down road 12b in the tunnel 2 so as to form a line at regular intervals below the floor in the tunnel 2, and the plurality of connection devices 6 are They are connected in series by a wired communication line 8 to be described later. The number of connection devices 6 can be arbitrarily selected according to the length of the tunnel 2 or the wired communication line 8. Further, the interval between the connection devices 6 is determined by an installation interval corresponding to the performance of the fire detector 14 and the fire extinguishing device 16.

  Specifically, the connection device 6 according to the present embodiment includes various terminals (fire detector 14, fire extinguishing device (water spray automatic valve etc.) 16, emergency telephone door (not shown), emergency exit door (illustration) in the tunnel 2. A terminal connection device (first communication device) 60 that is an interface between the monitoring device 4 and the amplification device 66 that amplifies a wired signal transmitted through the wired communication line 8 described later. included. In FIG. 1, ten connection devices 6 including a terminal connection device 60 and an amplification device 60 are installed in each of the uplink 12 a and the downlink 12 b, but in this embodiment, 10 The number of tunnels 2 is not limited to the number of tunnels 2 and can be provided. In FIG. 1, the amplification device 66 is provided so as to sandwich the two terminal connection devices 60, but is not particularly limited thereto. The installation position of the amplifying device 66 is not particularly limited as long as it is provided at an appropriate order and interval according to the length of the wired communication line 8, but the amplifying device 66 is provided at each end of the tunnel 2. Provided.

  The terminal connection device 60 is connected to the various terminals in the tunnel 2 as described above, converts the signal transmitted from the monitoring device 4 and transmits it to the terminal, or appropriately transmits the signal from the terminal. Can be converted into a simple signal and transmitted to the monitoring device 4. Specifically, in the terminal connection device 60, the fire detector side block 62 (see FIG. 6) connected to the fire detector 14 and the fire extinguishing device side block 64 (see FIG. 6) connected to the fire extinguishing device 16 and the like. ) Is provided separately. The fire detector side block 62 is connected to a line 8a (first line) of the wired communication lines 8 described later. On the other hand, the fire extinguishing apparatus side block 64 is connected to a line (second line) 8 b of the wired communication line 8. Thus, by providing the fire detector side block 62 and the fire extinguisher side block 64 separately, even if a failure or the like occurs in one block, the function in the other block is not hindered.

  As described above, the amplifying device 66 can amplify the wired signal transmitted through the wired communication line 8. Further, the amplifying device 66 can also supply power to a red indicator lamp or an alarm bell (not shown) built in a fire hydrant (not shown) provided in the tunnel 2.

  Furthermore, in the tunnel communication system 1 according to the present embodiment, each terminal, and further, unique identification information (address) is set in each of the fire detector side block 62 and the fire extinguishing device side block 64 of the terminal control device 60. Has been. For example, the monitoring device 4 transmits and receives a signal including identification information of the terminal when receiving communication from a specific terminal or controlling a specific terminal. When each terminal receives a signal including its own identification information from the monitoring device 4, each terminal performs a predetermined operation based on the signal.

(Fire detector 14)
It is installed in the tunnel 2 at regular intervals, has a function of detecting a fire caused by a traffic accident or a vehicle failure and notifying the monitoring device 4 that the fire has been detected. In addition, the detection sensitivity can be self-tested based on the control from the monitoring device 4 so that the level of the detection function can be constantly maintained.

(Fire extinguishing device 16)
Similar to the above-described fire detector 14, it is installed in the tunnel 2 at regular intervals, and in order to avoid the spread of the fire that has occurred, based on the control from the monitoring device 4, a predetermined section in the tunnel 2 is Has the function of discharging fire-fighting water. For example, the fire extinguishing device 16 includes a water spray automatic valve or the like.

(Wired communication line 8)
The wired communication line 8 is a transmission line that is configured by a multicore cable including a communication line and a power line, and connects the above-described monitoring device 4 and the plurality of connection devices 6 in a communicable manner. Specifically, as shown in FIG. 1, the wired communication line 8 includes two lines 8 a and 8 b that connect a plurality of connection devices 6 in series and doubly, and ends of these two lines 8 a. Are connected at the connection device 6n farthest from the monitoring device 4 (specifically, the two lines 8a are connected within the connection device 6n). That is, the wired communication line 8 starts from the monitoring device 4 via the line 8a and connects to the connection device 6n via the plurality of connection devices 6, and further starts again from the connection device 6n via the line 8b. It is comprised in the form of a loop which connects to the monitoring apparatus 4 via the connection apparatus 6 of this. More specifically, the line 8a connects the monitoring device 4, the fire detector side block 62 of the plurality of terminal connection devices 60, and the plurality of amplification devices 66 in series. The line 8b connects the monitoring device 4, the fire extinguishing device side blocks 64 of the plurality of terminal connection devices 60, and the plurality of amplification devices 66 in series.

<< Outline of operation of communication system 1 for tunnel >>
The outline of the configuration of the tunnel communication system 1 according to the present embodiment has been described above. Subsequently, an outline of an operation (communication method) in the tunnel communication system 1 according to the present embodiment will be described with reference to FIGS. 1 and 2. FIG. 2 is an explanatory diagram for explaining a case where one failure 100 occurs on the wired communication line 8 of the tunnel communication system 1 according to the present embodiment. In detail, FIG. 2 is easy to understand. Therefore, only the configuration of the communication system for tunnel 1 according to the uplink 12a of FIG. 1 is shown.

  In the tunnel communication system 1, for example, when any of the fire detectors 14 installed in the tunnel 2 detects a fire, the fire detector 14 is connected to the terminal connected to the fire detector 14. A detection signal for notifying that a fire has been detected is transmitted to the connection device 60. The terminal connection device 60 adds identification information (address) assigned to the fire detector 14 to information indicating that a fire has been detected. Further, the terminal connection device 60 converts the detection signal into a predetermined signal format, and transmits the converted detection signal to the monitoring device 4 via the wired communication line 8 at a predetermined timing. And the monitoring apparatus 4 which received the said detection signal specifies the fire detector 14 which detected the fire based on the information contained in the said detection signal, and notifies a road administrator.

  When the road supervisor operates the fire extinguishing device 16 around the fire detector 14 based on the notification, the monitoring device 4 transmits the fire extinguishing device via the wired communication line 8. A control signal is transmitted to the terminal connection device 60 connected to 16. Further, the terminal connection device 60 that has received the control signal converts the control signal into a predetermined signal format, and transmits the converted control signal to the fire extinguishing device 16. And the said fire extinguishing apparatus 16 which received the said control signal operate | moves based on the information contained in the said control signal.

  Therefore, in order to quickly perform the above-described fire extinguishing activities and the like, the monitoring device 4 is required to always grasp the detection status of the fire detector 14 and the like under any circumstances.

Therefore, in the tunnel for a communication system 1, for every predetermined time T ₁ (e.g., every few 100m sec), the monitoring device 4 performs an operation to confirm the detection status of the fire detectors 14. More specifically, the monitoring device 4 periodically transmits a monitoring signal to the fire detector side block 62 (see FIG. 6) of each terminal connection device 60 via the wired communication line 8. The fire detector side block 62 of each terminal connection device 60 that has received the monitoring signal transmits a response signal as a response to the received monitoring signal to the monitoring device 4 via the wired communication line 8. Further, the fire detector side block 62 of each terminal connection device 60 indicates that the detection state of the terminal such as the fire detector 14 connected to itself has changed (for example, if the fire detector 14 detects a fire, If the detector 14 has received a signal from the terminal in advance, the detection signal, which is a signal notifying that the detection state has changed, is received at the timing when the monitoring signal is received. To the monitoring device 4 via

  Specifically, the monitoring device 4 requests monitoring signals from the fire detector side block 62 of the terminal connection device 60 all at once. At this time, the monitoring device 4 requests a monitoring signal to pass through the line 8a along the direction of the arrow A in FIG. Furthermore, the fire detector side block 62 of the terminal connection device 60 is along the direction opposite to the direction of the arrow A in FIG. 1, that is, the direction in which the monitoring signal travels along the transmission path of the received monitoring signal. In the opposite direction, a response signal is transmitted via the line 8a.

Further, the response signal includes identification information (address) for identifying the fire detector side block 62 of the terminal connection device 60 that has transmitted the response signal. Therefore, the monitoring device 4 transmits the monitoring signals from the fire detector side blocks 62 of all the terminal connection devices 60 via the line 8a within a predetermined time T ₂ (for example, several hundred milliseconds) after transmitting the monitoring signal. When the response signal can be received, it can be understood that the monitoring device 4 and the fire detector side blocks 62 of all the terminal connection devices 60 are in a communicable state. Moreover, the monitoring apparatus 4 can grasp | ascertain that the fire etc. occurred in the division corresponding to the fire detector side block 62 of the terminal connection apparatus 60 which transmitted the detection signal, when a detection signal is received.

That is, in the tunnel communication system 1, it is confirmed whether or not there is a fire by polling in which the monitoring device 4 periodically inquires the fire detector side blocks 62 of the plurality of terminal connection devices 60. Or whether or not the monitoring device 4 and the fire detector 14 are in a communicable state. In the case where the response signal from the fire detector side block 62 of all the terminal connection unit 60 via a line 8a from the transmission of the monitoring signal of the first at a predetermined time T in ₂ can not be received, then, above The transmission of the monitoring signal as described above may be repeated a plurality of times (for example, three times).

  Incidentally, as shown in FIG. 2, the amplifying device 66d, which is the connecting device 6 that is located fourth in the right direction in the figure counted from the monitoring device 4, and the fifth position in the right direction in the figure counted from the monitoring device 4. Consider a case where a failure 100 such as a disconnection or a short circuit occurs in the line 8a in the section with the terminal connection device 60e that is the connection device 6 to be connected. In such a case, even if the monitoring device 4 transmits a monitoring signal to each of the fire detector side blocks 62 of the plurality of terminal connection devices 60 via the line 8a, the monitoring signal does not cause the failure on the line 8a. 100 cannot proceed in the direction of arrow B in the figure. As a result, the fire detector side blocks 62 (see FIG. 6) of the plurality of terminal connection devices 60 located between the amplification device 66d and the amplification device 66n, which is the connection device 6n installed farthest from the monitoring device 4. Reference) cannot receive the monitoring signal via the line 8a. Further, each fire detector side block 62 of the plurality of terminal connection devices 60 does not receive a monitoring signal, and therefore does not transmit a response signal as a response to the monitoring signal via the line 8a.

As a result, the monitoring device 4, within a predetermined time from the transmission of the monitor signal T _2, a terminal connecting device 60b which is positioned in the second to the right in FIG counted from the monitoring device 4, counted from the monitoring device 4 Thus, the response signal from the fire detector side block 62 to the terminal connection device 60c located third can be received via the line 8a. However, the monitoring device 4 cannot receive the response signal from the fire detector side block 62 of the plurality of terminal connection devices 60 located between the amplification device 66d and the amplification device 66n via the line 8a. . Therefore, since the monitoring device 4 cannot receive the response signal from the fire detector side block 62 of all the terminal connection devices 60 via the line 8a, the monitoring device 4 grasps that the failure 100 has occurred on the line 8a. be able to.

  Therefore, the monitoring device 4 that has grasped that the failure 100 has occurred on the line 8a, this time, for each of the fire detector side blocks 62 of the plurality of terminal connection devices 60 via the line 8b and the line 8a. Request supervisory signals. At this time, the monitoring device 4 reaches the amplifying device 66n along the arrow C in FIG. 2, that is, via the line 8b, and further connects each terminal connecting device from the amplifying device 66n via the line 8a. A monitoring signal is requested along a route that goes to 60 fire detector side block 62. Finally, the monitoring signal follows the path of arrow C as described above and reaches the fire detector side block 62 of the terminal connection device 60e. As shown in FIG. 2, there is no fault 100 on the line 8b, and there is no fault 100 on the line 8a in the section between the amplifier 66n and the terminal connection device 60e. Can reach the fire detector side block 62 of the terminal connection device 60e. That is, the monitoring device 4 can use a path that bypasses the obstacle 100 by using the line 8b. By using this path, the monitoring signal is transmitted from the amplification device 66d to the amplification device 66n. Can be requested to the fire detector side blocks 62 of the plurality of terminal connection devices 60 located between the two.

  And the fire detector side block 62 of the terminal connection apparatus 60 which received the said monitoring signal transmits the response signal as a response of the received monitoring signal to the monitoring apparatus 4 similarly to the above. At this time, the fire detector side block 62 of each terminal connection device 60 monitors the transmission path of the received monitoring signal so as to follow the path indicated by the arrow C in FIG. The response signal is transmitted through the line 8b and a part of the line 8a in the direction opposite to the direction in which the signal travels. Similarly to the above, the fire detector-side block 62 of each terminal connection device 60 is similar to the response signal when the detection state of the terminal such as the fire detector 14 connected to itself has changed. At the timing when the monitoring signal is received, a detection signal that is a signal notifying that the detection state has changed is transmitted to the monitoring device 4.

Thus, the monitoring device 4, within a predetermined time T ₂ from the transmission of the monitoring signal, through a portion of the line 8b and the line 8a, a plurality of terminals located until amplifier 66n from amplifier 66d When the response signal from the fire detector side block 62 of the connection device 60 can be received, it can be understood that the monitoring device 4 and the terminal connection device 60 are in a communicable state. Moreover, the monitoring apparatus 4 can grasp | ascertain that the fire etc. occurred in the area corresponding to the fire detector side block 62 of the terminal connection apparatus 60 which transmitted the detection signal, when receiving the detection signal. .

  As described above, in the tunnel communication system 1 according to the present embodiment, by configuring the wired communication line 8 in a loop shape, even if a failure 100 occurs on the wired communication line 8, the communication path is changed. By detouring so as to avoid the failure 100 on the wired communication line 8, the monitoring device 4 and the terminal connection device 60 can be maintained in a communicable state.

<< Background >>
However, even in the case of the wired communication line 8 configured in a loop as described above, there may be a case where communication between the monitoring device 4 and the terminal connection device 60 cannot be maintained. Such a case will be described with reference to FIG. FIG. 3 is an explanatory diagram for explaining a case in which a plurality of faults 100a and 100b occur on the wired communication line 8 of the tunnel communication system 1. Like FIG. 2, FIG. Only the configuration of the tunnel communication system 1 related to one upstream line 12a is shown.

  As shown in FIG. 3, an amplifying device 66d that is located fourth from the monitoring device 4 in the right direction in the figure and a terminal connection device 60e that is located from the monitoring device 4 to the fifth in the right direction in the figure. The first failure 100a occurs in the line 8a in the interval between them. Furthermore, the line in the section between the terminal connection device 60f, which is located sixth from the monitoring device 4 in the right direction in the figure, and the amplifier device 66g, which is located from the monitoring device 4 in the seventh direction in the right direction in the drawing. In 8a, the second failure 100b has occurred.

  In such a case, even if the monitoring device 4 requests a monitoring signal from the fire detector side block 62 (see FIG. 6) of the terminal connection device 60 via the line 8a along the direction indicated by the arrow D in the figure. Due to the fault 100a on the line 8a, the fire detector side blocks 62 of the plurality of terminal connection devices 60 located between the amplification device 66d and the amplification device 66n cannot receive the monitoring signal. Further, even if the monitoring device 4 transmits a monitoring signal to the terminal connection device 60 via a part of the line 8b and the line 8a as shown by the arrow E in the figure, due to the failure 100b on the line 8a, The fire detector side blocks 62 of the plurality of terminal connection devices 60 located between the amplifying device 66d and the amplifying device 66a (the amplifying device 66 installed closest to the monitoring device 4) receive the monitoring signal. I can't. As a result, the fire detector side block 62 of the terminal connection device 60 that cannot receive the monitoring signal from the monitoring device 4, more specifically, the fire detectors of the terminal connection devices 60e and 60f sandwiched between the failure 100a and the failure 100b. The side block 62 does not transmit a response signal as a response to the monitoring signal. That is, as shown in FIG. 3, when a plurality of failures 100a and 100b occur on the wired communication line 8, the monitoring device 4 and some terminal connection devices 60 may not be in a communicable state. is there.

  Accordingly, the present inventors have created the tunnel communication system 1 according to the embodiment of the present invention, focusing on the above circumstances. According to the embodiment of the present invention, even when a plurality of faults 100 occur in the wired communication line 8, it is possible to maintain a state in which communication between the monitoring device 4 and the terminal is possible. Hereinafter, the detailed configuration and operation of the embodiment of the present invention will be sequentially described in detail.

<< Detailed Configuration of Tunnel Communication System 1 >>
The detailed configuration of the communication system for tunnel 1 according to the embodiment of the present invention will be described below with reference to FIGS. FIG. 4 is an explanatory diagram for explaining a detailed configuration of the tunnel communication system 1 according to the embodiment of the present invention. FIG. 5 is an explanatory diagram for explaining a configuration of the monitoring device 4 according to the embodiment of the present invention. FIG. 6 is an explanatory diagram for explaining a configuration of the terminal connection device 60 according to the embodiment of the present invention. Further, FIG. 7 is an explanatory diagram for explaining the configuration of the amplifying apparatus 66 according to the embodiment of the present invention.

  As shown in FIG. 4, the communication system 1 for a tunnel includes a monitoring device 4 for monitoring various terminals such as a fire detector 14 and a fire extinguishing device 16 provided in the tunnel 2, and a plurality of devices connected to these terminals. Loop connection for connecting the terminal connection device 60, the plurality of amplification devices 66 connected in series with the plurality of terminal connection devices 60, and the monitoring device 4, the terminal connection device 60, and the amplification device 66 in a communicable state. The communication line 8 is mainly included. The intervals between the plurality of terminal connection devices 60 and the amplification devices 66 are not particularly limited as long as the communication between the monitoring device 4 and the terminal connection devices 60 and the amplification devices 66 can be maintained. More specifically, the intervals between the plurality of terminal connection devices 60 and the amplification devices 66 are the communicable distances (wireless communication) of the wireless communication unit 606 (see FIGS. 6 and 7) included in the terminal connection devices 60 and the amplification devices 66 described later. The radius is preferably shorter than the radius in the communicable range in which the wireless communication unit 606 can communicate with the unit 606 as a center. Below, the detailed structure of the various apparatuses contained in the communication system 1 for tunnels of this embodiment is demonstrated.

<Monitoring device 4>
As shown in FIG. 5, the monitoring device 4 mainly includes a control unit 400, a wired communication unit 402, and a display unit 404. Below, each function part contained in the monitoring apparatus 4 of this embodiment is demonstrated.

(Control unit 400)
The control unit 400 has a function of generally controlling the operation of the monitoring device 4 using hardware such as a CPU (Central Processing Unit) and a RAM (Random Access Memory) built in the monitoring device 4. For example, when the control unit 400 determines that a plurality of faults 100 have occurred in the wired communication line 8, the control unit 400 performs control so as to guide transmission of a response signal to at least one of the plurality of terminal connection devices 60. To do. In addition, when the control unit 400 receives a control signal from a centralized monitoring device (not shown) installed in a centralized monitoring center (not shown), the wired communication unit 402 described later is based on the received control signal. On the other hand, control is performed to transmit a signal to the terminal connection device 60 and the like.

(Wired communication unit 402)
The wired communication unit 402 is provided inside the monitoring device 4 and can communicate with the terminal connection device 60 and the like via the wired communication line 8.

(Operation display unit 404)
The display unit 404 is provided on the surface of the monitoring device 4, for example, and can indicate the state of the terminal connection device 60, the amplification device 66, and the like. The display unit 404 is realized, for example, by a liquid crystal display (LCD) device, an organic light emitting diode (OLED) device, or the like. Further, the display unit 404 may be a plurality of lamps (not shown) provided on the surface of the monitoring device 4.

<Terminal connection device 60>
As shown in FIG. 6, the terminal connection device 60 includes control units 600a and 600b, a wired communication unit 602a on the fire detector 14 side, a wired communication unit 602b on the fire extinguishing device 16 side, a protector 604, and a wireless device. The communication unit (first wireless communication unit) 606 is mainly included. Below, each function part contained in the terminal connection apparatus 60 of this embodiment is demonstrated. As shown in FIG. 6, a block including the control unit 600 a, the wired communication unit 602 a, and the protector 604 and connected to the fire detector 14 is referred to as a fire detector side block 62. A block including the control unit 600b and the wired communication unit 602b and connected to the fire extinguishing device 16 is referred to as a fire extinguishing device side block 64.

(Control unit 600a, 600b)
The control units 600a and 600b have a function of generally controlling the operation of the terminal connection device 60 using hardware such as a CPU and a RAM built in the terminal connection device 60. Specifically, the control unit 600 a has a function of controlling each functional unit included in the fire detector side block 62. The control unit 600b has a function of controlling each functional unit included in the fire extinguishing apparatus side block 64.

(Fire detector side wired communication unit 602a)
The fire detector side wired communication unit 602a is an interface provided between the wired communication line 8 and the fire detector 14 provided inside the terminal connection device 60. Specifically, the fire detector side wired communication unit 602a converts the signal transmitted from the monitoring device 4 via the line 8a of the wired communication line 8 into a predetermined signal format and detects the fire via the control unit 600a. The signal from the fire detector 14 received through the control unit 600a can be similarly converted and transmitted to the monitoring device 4 through the line 8a. The fire detector-side wired communication unit 602a is not limited to communicating with the fire detector 14, and includes, for example, an emergency exit door 14a, an emergency telephone door (not shown), and a foam fire hydrant (not shown). ) Etc., a limit switch contact signal for detecting opening and closing may be input.

(Fire extinguishing device side wired communication unit 602b)
The fire extinguishing apparatus side wired communication unit 602b is an interface provided between the wired communication line 8 and the fire extinguishing apparatus 16 provided inside the terminal connection apparatus 60. Specifically, like the fire detector side wired communication unit 602a, the fire extinguishing device side wired communication unit 602b converts a signal transmitted from the monitoring device 4 via the line 8b of the wired communication line 8 to convert the fire extinguishing device 16. Or the signal from the fire extinguishing device 16 can be converted and transmitted to the monitoring device 4 via the line 8b.

(Protector 604)
The protector 604 is provided inside the terminal connection device 60 and connects the fire detector 14 to the terminal connection device 60. When a short circuit or the like occurs in the fire detector 14, the protector 604 detects the short circuit and disconnects the fire detector 14 from the terminal connection device 60. Thus, although the fire detector 14 cannot be monitored by the monitoring device 4 due to the disconnection by the protector 604, it is possible to avoid a short circuit of the fire detector 14 from adversely affecting other fire detectors.

(Wireless communication unit 606)
The wireless communication unit 606 is a multi-hop wireless communication device that is provided inside the terminal connection device 60 and can perform multi-hop wireless communication with other terminal connection devices 60 and amplification devices 66. . Specifically, the wireless communication unit 606 is connected to the control unit 600a and the control unit 600b, converts the signal received from the monitoring device 4 and transmits the signal to the fire detector 14 and the like via the control units 600a and 600b. Can do. Details of the multi-hop wireless communication will be described later. The wireless communication unit 606 can perform multi-hop wireless communication with the wireless communication unit of the monitoring device 4 when a similar wireless communication unit (not shown) is provided in the monitoring device 4. .

<Amplifier 66>
As illustrated in FIG. 7, the amplification device 66 mainly includes a control unit 660, an amplification unit 662, and a wireless communication unit (third wireless communication unit) 664. Hereinafter, each functional unit included in the amplification device 66 of the present embodiment will be described.

(Control unit 660)
The control unit 660 has a function of generally controlling the operation of the amplification device 66 using hardware such as a CPU and a RAM built in the amplification device 66. For example, the control unit 660 can control supply of power to a red indicator lamp or an alarm bell (not shown) built in a fire hydrant (not shown) provided in the tunnel 2. Further, when the control unit 660 receives an induction signal for inducing the start of wireless communication between the terminal connection device 60 and the amplification device 66 from the monitoring device 4 via the wired communication line 8, it will be described later. The wireless communication unit 664 can also be controlled to transmit a monitoring signal for controlling to start wireless communication to the terminal connection device 60 or the like.

(Amplifier 662)
The amplifying unit 662 amplifies a signal transmitted via the wired communication line 8. For example, when the tunnel 2 is a long distance, the wired communication line 8 is naturally long, and a signal transmitted via the wired communication line 8 is attenuated according to the distance that has passed through the wired communication line 8. Therefore, by providing the amplification device 66 having the amplifying unit 662 with a certain interval on the wired communication line 8, the signal is amplified and the signal transmitted through the wired communication line 8 is maintained at a certain level of quality. be able to.

(Wireless communication unit 664)
The wireless communication unit 664 is provided inside the amplifying device 66, and can perform multi-hop wireless communication with the other terminal connection devices 60 and the amplifying device 66 in the same manner as the wireless communication unit 606 described above. This is a multi-hop wireless communication device that can be used. Details of the multi-hop wireless communication will be described later.

  As shown in FIG. 2, in the inside of the amplifying device 66n, which is the connecting device 6n installed at the position farthest from the monitoring device 4 (see FIGS. 1 and 2), the line 8a and the line of the wired communication line 8 are connected. 8b is connected to form a looped wired communication line 8.

  Further, the terminal connection device 60 is supplied with double DC power from the amplifying devices 66 on both sides by the power line of the wired communication line 8.

<< About multi-hop wireless communication >>
The detailed configuration of the various devices of the tunnel communication system 1 according to the present embodiment has been described above. Next, multi-hop wireless communication and wireless communication according to the present embodiment will be described with reference to FIGS. 8 and 9. FIG. 8 is an explanatory diagram for explaining the multi-hop wireless communication. In FIG. 8, the wireless communication path is indicated by a solid line. FIG. 9 is an explanatory diagram for explaining wireless communication according to the present embodiment.

  Multi-hop wireless communication is a communication technique in which a plurality of wireless communication devices 900 transmit signals through their adjacent wireless communication devices 900 via a bucket relay system. Multi-hop wireless communication can enable communication between wireless communication devices 900 that are not adjacent by repeating transmission between adjacent wireless communication devices 900, so it is desirable to construct a communication network in a wide area. Used in cases.

  Specifically, the identification information (address) of the transmission destination wireless communication device 900k to which the signal is to be transmitted is added to the signal transmitted by the wireless communication device 900a as the transmission source shown in FIG. First, the wireless communication device 900a transmits the signal to the adjacent wireless communication devices 900b, 900c, and 900d located within the communicable range where communication from the wireless communication device 900a is possible. Although these wireless communication devices 900b, 900c, and 900d have received the signal, the wireless communication devices 900b, 900c, and 900d do not include their own identification information. To send the signal. By repeating such transmission, the signal is finally transmitted to the wireless communication device 900k.

  As shown in FIG. 8, each wireless communication device 900 can also transmit a signal to another wireless communication device 900 using a plurality of communication paths, and automatically selects an optimal communication path. It is also possible. Further, when it becomes impossible to transmit a signal via a specific communication path due to deterioration of the radio wave condition, each wireless communication device 900 can also search for and transmit another communication path. Therefore, it can be said that multi-hop wireless communication is communication with high tolerance against a failure on a communication network.

  By the way, in general, in wireless communication, since the communication state is likely to change due to the influence of the surrounding environment or the like, it has been difficult to guarantee that the wireless communication devices 900 are always communicable. Further, in the wireless communication in the tunnel 2, the tunnel 2 is a closed space and may be bent further, so that radio waves are likely to be reflected and attenuated, and long-distance communication is performed even if the radio wave intensity is increased. It is difficult. Furthermore, in wireless communication, wireless signals do not ideally propagate in a closed space, so the state of communication becomes unstable compared to the case of propagating through a dedicated wired communication line for communication. May occur. For this reason, wireless communication has been considered unsuitable for disaster prevention communications that require communication stability. For these reasons, wireless communication has not been used in conventional tunnel communication systems.

  However, the tunnel communication system 1 according to the present embodiment uses wireless communication. However, in the present embodiment, wireless communication is used to compensate for the vulnerability of wired communication in the conventional tunnel communication system 1 rather than constructing a communication network in the tunnel communication system 1 only by wireless communication. . By doing in this way, the communication network of the communication system 1 for tunnels concerning this embodiment can be strengthened. Further, in the present embodiment, multi-hop wireless communication with high resistance to failures is used as wireless communication, and the communication network of the communication system 1 for tunnels can be made stronger.

  More specifically, as shown in FIG. 9, the tunnel communication system 1 according to the present embodiment includes a monitoring device 4, a fire detector 14 provided in the tunnel 2 (not shown in FIG. 9), and the like. A plurality of terminal connection devices 60, a plurality of amplification devices 66, and a looped wired communication line 8 that connects the monitoring device 4, the terminal connection device 60, and the amplification device 66. . In a normal state, the tunnel communication system 1 performs communication between the monitoring device 4 and the terminal connection device 60 using wired communication via the wired communication line 8. On the other hand, in a state where a plurality of faults 100 have occurred on the wired communication line 8, the wireless communication unit 606 provided in the terminal connection device 60 and the amplification device 66 is used to communicate between the terminal connection device 60 and the amplification device 66. Perform multi-hop wireless communication. In the multihop wireless communication, as shown in FIG. 9, the terminal connection device 60 and the amplification device 66 pass signals to the adjacent terminal connection device 60 or amplification device 66 in a bucket relay manner, thereby performing wireless communication. I do. In the present embodiment, in order to realize multi-hop wireless communication, the intervals between the plurality of terminal connection devices 60 and the amplification devices 66 are made shorter than the communicable distance of the multi-hop wireless communication device. A plurality of terminal connection devices 60 and amplifying devices 66 are installed.

  When the present embodiment is implemented in Japan or the like, the multi-hop wireless communication according to the present embodiment uses a 920 MHz band ISM band (Industrial Scientific and Medical Band) that has become available in recent years. It is preferable. Since the frequency band has a communicable range with a radius of about several kilometers, it can be applied to long-distance communication, for example, wireless communication for a long-distance tunnel 2. Moreover, since the license is not required and the antenna is small, it can be applied to disaster prevention terminal equipment communication, that is, the tunnel communication system 1.

<< Operation of Communication System 1 for Tunnel >>
The multi-hop wireless communication according to this embodiment has been described above. Next, the operation (communication method) of the tunnel communication system 1 according to the present embodiment will be described with reference to FIGS. 10 to 16. FIG. 10 is a flowchart of the operation of the tunnel communication system 1 according to the present embodiment. 11 to 16 are explanatory diagrams for explaining each step in FIG. 10. 11 to 14 and 16 show signal transmission paths between the monitoring apparatus 4 and the terminal connection apparatus 60, and arrows in the drawings indicate signal transmission paths. In more detail, in these drawings, a solid line arrow indicates a transmission path of a wired signal, and a chain line arrow indicates the failure 100 of the wired signal that could not be transmitted due to the failure 100 generated on the wired communication line 8. Indicates the transmission path to be transmitted when it does not occur. Further, in FIG. 16, a thick arrow indicates a radio signal transmission path. In these drawings, only the amplifying device 66a closest to the monitoring device 4 is shown, and the other amplifying devices 66 are not shown. In these drawings, the terminal connection device 60 is illustrated, which means the fire detector side block 62 of the terminal connection device 60.

As shown in FIG. 10, the flowchart of the operation of the tunnel communication system 1 according to the present embodiment includes eight steps from step S101 to step S115. These steps are repeatedly performed every predetermined time T ₁ in order for the monitoring device 4 to check the detection status of the terminal such as the fire detector 14.

(Step S101)
Monitoring device 4, for each predetermined time T ₁ to a predetermined, along a direction indicated by an arrow A in FIG. 1, via a line 8a wired communication line 8, the fire detector side of the terminal connection unit 60 A monitoring signal (first monitoring wired signal) is transmitted to the block 62. In FIG. 11, as indicated by a plurality of arrows in the upper region F in the drawing, the monitoring device 4 requests a monitoring signal from the fire detector side block 62 of the terminal connection device 60.

  When the fire detector side block 62 of each terminal connection device 60 is able to receive the monitoring signal, as shown by the arrow in the lower region G of FIG. (First response wired signal) is transmitted to the monitoring device 4 via the line 8a. At this time, the fire detector side block 62 of each terminal connection device 60 makes the same transmission path as the monitoring signal opposite to the transmission direction of the monitoring signal (the path indicated by the arrow A in FIG. 1). Is followed in the direction opposite to the direction of the arrow A), the response signal is transmitted. In addition, the fire detector side block 62 of each terminal connection device 60 is used when the detection state of a terminal such as the fire detector 14 connected to itself changes (for example, when the fire detector 14 detects a fire). Transmits a detection signal, which is a signal notifying that the detection state has changed, to the monitoring device 4 via the line 8a in the same manner as the response signal (in FIG. 11, in regard to the transmission of the detection signal). , Illustration is omitted). Next, the process proceeds to step S103.

(Step S103)
Monitoring device 4, in the in time the monitor signal from the requirements of a given T ₂ at step S101, whether the response signal from the fire detector side block 62 of all the terminal connection unit 60 via the line 8a has been received Judge whether or not. When the monitoring device 4 is able to receive response signals from the fire detector side blocks 62 of all the terminal connection devices 60 via the line 8a as indicated by the arrow in the lower region G of FIG. The operation is completed assuming that the monitoring device 4 and the fire detector side block 62 of each terminal connection device 60 are in a communicable state via the line 8a. When the monitoring device 4 receives the detection signal, the monitoring device 4 identifies the terminal or the like (for example, the fire detector 14) that transmitted the detection signal based on the detection signal, and notifies the road administrator.

  On the other hand, as shown in FIG. 12, when the monitoring device 4 cannot receive the response signals from the fire detector side blocks 62 of all the terminal connection devices 60 via the line 8a, the monitoring device 4 and the terminal connection device Assuming that the fire detector side block 62 of 60 is not in a communicable state via the line 8a (assuming that a failure 100 has occurred on the line 8a), the process proceeds to step S105.

  Specifically, FIG. 12 shows a line 8a in a section between the terminal connection device 60b located second from the monitoring device 4 and the terminal connection device 60c located third from the monitoring device 4. A case where a failure 100 has occurred is shown. The fire detector side blocks 62 of the plurality of terminal connection devices 60 that are further from the monitoring device 4 than the terminal connection device 60b after the terminal connection device 60b cannot receive the monitoring signal via the line 8a (FIG. 12). See the plurality of arrows in the upper region H). Therefore, the fire detector side block 62 of the plurality of terminal connection devices 60 that cannot receive the monitoring signal does not transmit a response signal. As a result, the monitoring device 4 cannot receive a response signal from the fire detector side block 62 of the plurality of terminal connection devices 60 (see the arrow in the lower region I in FIG. 12).

  When the monitoring device 4 cannot receive the response signals from the fire detector side blocks 62 of all the terminal connection devices 60, the monitoring device 4 performs steps S101 and S103 a predetermined number of times (for example, three times) determined in advance. May only be repeated. In addition, the monitoring device 4 identifies the terminal connection device 60 that could not receive the response signal in step S103, and displays a warning display on the display unit 404 to warn that the response signal cannot be received from the identified terminal connection device 60. It may be done. Furthermore, the monitoring device 4 may notify the road administrator of the centralized monitoring center (not shown) of the name of the terminal connection device 60 that could not receive the response signal in step S103.

(Step S105)
Next, the monitoring device 4 transmits a monitoring signal (first signal) to each of the fire detector-side blocks 62 of the plurality of terminal connection devices 60 via the line 8b and the line 8a as indicated by a path indicated by an arrow C in FIG. 2 monitoring wired signals). In FIG. 13, as indicated by a plurality of arrows in the upper region J in the figure, the monitoring device 4 requests a monitoring signal from the fire detector side block 62 of the terminal connection device 60.

  When the fire detector side block 62 of the terminal connection device 60 has received the monitoring signal, as shown by the arrow in the lower region K in FIG. 13, the fire detector side block 62 sends a response signal (second response wired signal). Then, the data is transmitted to the monitoring device 4 via the line 8b and a part of the line 8a. At this time, the fire detector side block 62 of the terminal connection device 60 makes the same transmission path as that of the monitoring signal opposite to the transmission direction of the monitoring signal (the path indicated by the arrow C in FIG. 2). The response signal is transmitted via the line 8b and part of the line 8a (following the direction opposite to the direction of the arrow C). In addition, the fire detector side block 62 of each terminal connection device 60 changes the detection state in the same manner as the response signal when the detection state of the terminal such as the fire detector 14 connected to itself changes. A detection signal, which is a signal for notifying the fact, is transmitted to the monitoring device 4 via the line 8b and a part of the line 8a (in FIG. 13, illustration of the transmission of the detection signal is omitted). ). Next, the process proceeds to step S107.

(Step S107)
Monitoring device 4, in the the monitoring signal a predetermined time after requesting the T ₂ at step S105, through a portion of the line 8b and the line 8a, the terminal connecting device response signal is not received in step S103 60 It is determined whether or not the response signal from the fire detector side block 62 has been received. The monitoring device 4 can receive a response signal from the fire detector side block 62 of the terminal connection device 60 via the line 8b and part of the line 8a as shown by the arrow in the lower region K of FIG. In such a case, the operation is completed assuming that the monitoring device 4 and the fire detector side block 62 of the terminal connection device 60 are in a communicable state. When the monitoring device 4 receives a detection signal notifying that a fire has been detected, the monitoring device 4 identifies the terminal connection device 60 that has transmitted the detection signal based on the detection signal and notifies the road administrator. .

  On the other hand, as shown in FIG. 14, the monitoring device 4 responds from the fire detector side block 62 of the terminal connection device 60 that could not receive the response signal in step S103 via the line 8b and part of the line 8a. If the signal cannot be received, the monitoring device 4 and the fire detector side block 62 of the terminal connection device 60 are not in a communicable state (a plurality of faults 100 occur on the wired communication line 8). If it is grasped, the process proceeds to step S109.

  Specifically, in FIG. 14, similarly to FIG. 12, a failure 100 has occurred in the line 8 a in the section between the terminal connection device 60 b and the terminal connection device 60 c. The case where the failure 100 has occurred in the line 8a in the section with the terminal connection device 60d positioned fourth from the device 4 is shown. In this case, the fire detector side block 62 of the plurality of terminal connection devices 60 closer to the monitoring device 4 than the terminal connection device 60d cannot receive the monitoring signal (a plurality of the upper region L in FIG. 14). See arrow). Therefore, the fire detector side block 62 of the plurality of terminal connection devices 60 that cannot receive the monitoring signal does not transmit a response signal. As a result, the monitoring device 4 cannot receive a response signal from the fire detector side block 62 of the plurality of terminal connection devices 60 (see the arrow in the lower region M in FIG. 14). In the case illustrated in FIG. 14, the terminal connection device 60 that cannot be received by the monitoring device 4 in both step S103 and step S107 is the terminal connection device 60c that is located third from the monitoring device 4.

  When the monitoring device 4 cannot receive a response signal from the fire detector side block 62 of the terminal connection device 60 that has not received the response signal in step S103, the monitoring device 4 performs steps S105 and S107 in advance. May be repeated as many times as possible.

(Step S109)
The monitoring device 4 identifies the terminal connection device 60 corresponding to the response signal that could not be received in step S103 and step S107. That is, the monitoring device 4, a predetermined time T _2, the terminal connecting device that has transmitted the response signal could be received by the terminal connection unit 60 or the step S107 and transmits a response signal can be received in step S103 A terminal connection device 60 other than 60 is specified. As described above, the response signal includes identification information for identifying the terminal connection device 60 that has transmitted the response signal. Therefore, the monitoring device 4 can recognize from which terminal connection device 60 the response signal can be received by analyzing the received response signal. Furthermore, based on the recognition, it can be recognized that the response signal from which terminal connection device 60 could not be received. For example, in step S103 as shown in FIG. 15, response signals from a plurality of terminal connection devices 60 from terminal connection devices 60c to 60n could not be received. Furthermore, in step S107, a case is considered in which a response signal from a terminal connection device 60 other than the terminal connection devices 60 (specifically, the terminal connection devices 60b and 60c) from the terminal connection devices 60d to 60n cannot be received. . In such a case, the terminal connection device 60c is specified as the terminal connection device 60 corresponding to the response signal that could not be received. Next, the process proceeds to step S111.

  In addition, the monitoring device 4 may cause the display unit 404 to display a warning that warns that a response signal cannot be received from the terminal connection device 60 identified in step S109. Furthermore, the monitoring device 4 may notify the warning content to a road administrator of a centralized monitoring center (not shown).

(Step S111)
The monitoring device 4 requests a monitoring signal from the terminal connection device 60 (the terminal connection device 60c in FIG. 16) identified in step S109 (selecting transmission). Specifically, as indicated by a thin solid line arrow in the upper region N in FIG. 16, the monitoring device 4 transmits an induction signal to the amplification device 66 a closest to the monitoring device 4 via the wired communication line 8. . Then, based on the reception of the induction signal, the amplification device 66a transmits a monitoring signal (monitoring wireless signal) for inducing transmission of a response signal by wireless communication to the terminal connection device 60 identified in step S109. , As indicated by the thick arrow in the upper region N of FIG.

  In step S111, the monitoring device 4 may send a monitoring signal to all the terminal connection devices 60, but transmits a monitoring signal only to the terminal connection device 60 specified in step S109. It is preferable to do. As described above, wireless communication is more susceptible to signal delay than wired communication. Therefore, in the present embodiment, it is preferable to reduce the number of signals to be transmitted so as not to cause a delay as much as possible, that is, to improve the communication speed. Therefore, in step S111, it is specified in step S109. It is preferable to transmit the monitoring signal only to the terminal connection device 60.

  When the identified terminal connection device 60 receives the monitoring signal, as shown by the thick arrow in the lower area P of FIG. 16, the response signal (response wireless) as a response to the received monitoring signal is received. Signal) is transmitted to the amplifying device 66a. Furthermore, the amplifying device 66a that has received the response signal transmits the response signal to the monitoring device 4 via the wired communication line 8 as indicated by the thin solid arrow in the upper region P of FIG. The response signal includes identification information (address) for identifying the terminal connection device 60 that has transmitted the response signal. Therefore, the monitoring device 4 can recognize from which terminal connection device 60 the response signal can be received by analyzing the received response signal. In addition, when the detection state of the terminal such as the fire detector 14 connected to itself is changed, the terminal connection device 60 that has received the monitoring signal notifies that the detection state has changed as in the case of the response signal. The detection signal to be transmitted is transmitted to the monitoring device 4 using wireless communication (in FIG. 16, illustration of the transmission of the detection signal is omitted). Next, the process proceeds to step S113.

(Step S113)
Monitoring device 4, in the inductive signal transmitted within a predetermined time T ₂ from the in step S111, via the amplifier 66a, whether or not the received response signal from the identified terminal connection unit 60 in step S109 Judging. As indicated by a plurality of arrows in the lower area P of FIG. 16, the monitoring device 4 finishes a series of operations when response signals from all the terminal connection devices 60 identified in step S109 are received. To do. When the monitoring device 4 receives a detection signal notifying that a fire has been detected, the monitoring device 4 identifies the terminal connection device 60 that has transmitted the detection signal based on the detection signal and notifies the road administrator. . On the other hand, if the response signals from all the terminal connection devices 60 specified in step S109 cannot be received, the process proceeds to step S115.

(Step S115)
The monitoring device 4 identifies the terminal connection device 60 corresponding to the response signal that could not be received in step S113, and displays a warning display that warns that the response signal cannot be received from the identified terminal connection device 60. The unit 404 performs the processing. Furthermore, the monitoring device 4 may notify the warning content to a road administrator of a centralized monitoring center (not shown).

  By the way, in the conventional communication system for tunnels, as described above, when a plurality of failures occur on the wired communication line as shown in FIG. 3, a terminal sandwiched between the monitoring device and the plurality of failures. There may be a case where communication by wire communication cannot be performed with the connection device. However, in the tunnel communication system 1 according to the present embodiment, not only wired communication but also wireless communication is used complementarily, so that the monitoring device 4 and the terminal connection device 60 Communication between the two can be established. That is, according to this embodiment, even when a plurality of failures occur in the wired communication line 8 by using wireless communication as a supplement to the vulnerability of wired communication in the conventional tunnel communication system, It is possible to maintain a communicable state between the device 4 and the terminal connection device 60 (terminal). As a result, the communication network of the tunnel communication system 1 can be strengthened. Moreover, in this embodiment, the communication network of the tunnel communication system 1 can be further strengthened by using multi-hop wireless communication having high resistance to failures as wireless communication. Furthermore, this embodiment can be realized without drastically modifying a conventional tunnel communication system whose reliability has been confirmed through many years of operation. Therefore, according to the present embodiment, higher reliability can be ensured by further using wireless communication while ensuring the reliability of the conventional tunnel communication system.

<< First Modification >>
In the above-described embodiment, the intervals between the plurality of terminal connection devices 60 and the amplification devices 66 are made shorter than the communicable distance of the wireless communication unit 606, so that the plurality of terminal connection devices 60 and amplification devices 66 arranged in series. Wireless communication was realized by passing signals between the two by multi-hop wireless communication. However, when there is a malfunctioning wireless communication unit 606 among the plurality of wireless communication units 606 included in the plurality of terminal connection devices 60 and amplification devices 66 arranged in series, multi-hop wireless communication is used. In some cases, the monitoring device 4 cannot communicate with the terminal connection device 60 and the amplification device 66. Accordingly, hereinafter, a tunnel communication system 1a according to a first modification of the embodiment of the present invention that can cope with such a case will be described with reference to FIG. FIG. 17 is an explanatory diagram for explaining the tunnel communication system 1a according to the first modification of the present embodiment. Note that illustration of the tunnel 2 is omitted in FIG.

  More specifically, as shown in FIG. 17, when the wireless communication unit 606 of the terminal connection device 60 a located on the right side of the amplification device 66 in the drawing is broken, the amplification device 66 sends the above terminal connection device. 60a cannot communicate via wireless communication. However, in the tunnel communication system 1a of this modification, as shown in FIG. 17, the interval between the plurality of terminal connection devices 60 and the amplification devices 66 is made shorter than half of the communicable distance Q of the wireless communication unit 606. (In other words, a plurality of terminal connection devices 60 and amplification devices 66 are installed such that three or more other wireless communication units 606 are included in the communicable range of each wireless communication unit 606). Specifically, the interval between the plurality of terminal connection devices 60 and the amplification devices 66 is made shorter than half of the communicable distance Q of the wireless communication unit 606, and specifically, the wireless communication unit 606 of the amplification device 66 shown in FIG. This communication range includes not only the terminal connection device 60a but also the terminal connection device 60b located on the right side of the terminal connection device 60a in the drawing. As a result, the amplifying device 66 can communicate with the terminal connecting device 60b via wireless communication. That is, according to the present modification, even when the wireless communication unit 606 of the terminal connection device 60a fails, the amplification device 66 is connected to the terminal connection device 60b and further via the terminal connection device 60b. Since communication can be performed with respect to the terminal connection device 60, a communication network related to multi-hop wireless communication can be maintained.

  As described above, according to the present modification, the interval between the plurality of terminal connection devices 60 and the amplification devices 66 is made shorter than half the communicable distance Q of the wireless communication unit 606, so that the wireless communication unit 606 has failed. Even if the connection device 60 exists, the communication between the monitoring device 4 and the other terminal connection device 60 can be maintained using multi-hop wireless communication.

<< Second Modification >>
In the above-described embodiment, in step S111, the monitoring device 4 starts transmitting a monitoring signal by wireless communication to the terminal device 60 identified in step S109 to the amplification device 66a closest to the monitoring device 4. A guidance signal to be guided to is transmitted via the wired communication line 8. Then, the amplification device 66a that has received the induction signal has transmitted a monitoring signal to the terminal connection device 60 identified in step S109 by wireless communication. However, in the present embodiment, the monitoring device 4 is not limited to transmitting an induction signal to the amplifying device 66a. For example, the monitoring device 4 directly identifies the terminal connection device specified in step S109. A monitoring signal may be transmitted to 60 by wireless communication. Therefore, a monitoring device 4a as a second modification of the present embodiment will be described with reference to FIG. FIG. 18 is an explanatory diagram for explaining a configuration of a monitoring device 4a according to a second modification of the present embodiment.

  As illustrated in FIG. 18, the monitoring device 4 a according to this modification includes a control unit 400, a wired communication unit 402, and a display unit 404, similarly to the monitoring device 4 described above. Further, the monitoring device 4 a includes a wireless communication unit (second wireless communication unit) 406. Note that the control unit 400, the wired communication unit 402, and the display unit 404 are the same as the control unit 400, the wired communication unit 402, and the display unit 404 of the monitoring device 4 described above. Only the unit 406 will be described.

(Wireless communication unit 406)
The wireless communication unit 406 is provided inside the monitoring device 4 a, and, like the wireless communication unit 606 of the terminal connection device 60 and the amplification device 66, a multihop wireless communication is performed between the terminal connection device 60 and the amplification device 66. This is a multi-hop wireless communication apparatus capable of performing communication.

  Thus, in this modification, by providing the wireless communication unit 406 in the monitoring device 4a, the monitoring device 4a directly communicates with the terminal connection device 60 identified in step S109 by wireless communication in step S111 described above. A monitoring signal (monitoring radio signal) that induces transmission of a response signal (response radio signal) can be transmitted.

<< Supplementary >>
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention pertains can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that these also belong to the technical scope of the present invention.

  In addition, each step in the operation of the above-described embodiment does not necessarily have to be processed in the order described. For example, the steps may be processed by changing the order as appropriate. Each step may be processed in parallel or individually instead of being processed in time series. Furthermore, the processing method of each step does not necessarily have to be processed according to the described method, and may be processed by other functional units, for example.

  Moreover, in the above-mentioned embodiment, although demonstrated as what applies to the communication system 1 for tunnels used with the disaster prevention system for tunnels, this embodiment is not limited to applying to the communication system 1 for tunnels. However, the present invention can be applied to other communication systems that require high reliability.

DESCRIPTION OF SYMBOLS 1, 1a Communication system for tunnels 2 Tunnel 4, 4a Monitoring device 6, 6a-6n Connecting device 8, 8a, 8b Line 12, 12a, 12b Road 14 Fire detector 14a Emergency exit door 16 Fire extinguishing device 60 Terminal connecting device 62 Fire detection Unit side block 64 Fire extinguisher side block 66 Amplifying device 100, 100a, 100b Fault 400, 600, 600a, 600b, 660 Control unit 402, 602a, 602b Wired communication unit 404 Display unit 406, 606, 664 Wireless communication unit 604 Security device 662 Amplifier 900, 900a, 900b, 900c, 900d, 900k Wireless communication device A, B, C, D, E Arrows F, G, H, I, J, K, L, M, N, P Area Q Communication possible distance

Claims (13)

A plurality of first communication devices installed along the tunnel;
A second communication device that monitors the plurality of first communication devices;
A looped wired communication line that connects the plurality of first communication devices and the second communication device in a communicable manner;
Including
Each of the plurality of first communication devices has a first wireless communication unit,
When the second communication device determines that a plurality of failures have occurred in the wired communication line, the second communication device induces transmission of a response wireless signal to at least one of the plurality of first communication devices. Having a control unit,
Communication system for tunnels. The second communication device further includes a second wireless communication unit,
If the control unit determines that a plurality of failures have occurred in the wired communication line, the control unit sends the second wireless communication unit to the response to at least one of the plurality of first communication devices. Control to transmit a monitoring wireless signal that induces transmission of the wireless signal;
The tunnel communication system according to claim 1. One or more amplifying devices for amplifying the wired signal;
The amplifying device is connected to the wired communication line and includes a third wireless communication unit.
The tunnel communication system according to claim 1. When the control unit determines that a plurality of failures have occurred in the wired communication line, the control unit transmits an induction signal to the amplifying apparatus via the wired communication line, and Control to cause at least one of the first communication devices to transmit a monitoring wireless signal that induces transmission of the response wireless signal;
The tunnel communication system according to claim 3. The wired communication line includes a first line and a second line that connect the plurality of first communication devices and the second communication device, and an end of the first line and the second line. Are connected,
The controller is
The second communication device passes the first line via the first line within a predetermined time after the first monitoring wired signal is transmitted to the plurality of first communication apparatuses via the first line. A portion of the plurality of first response wired signals transmitted from the plurality of first communication devices, which are responses to the first monitored wired signal, cannot be received; and
The second communication device passes the second line via the second line within a predetermined time after the second monitoring wired signal is transmitted to the plurality of first communication apparatuses via the second line. In a case where a part of the plurality of second response wired signals transmitted from the plurality of first communication devices and being a response to the second monitoring wired signal cannot be received,
Determining that a plurality of faults have occurred in the wired communication line;
The communication system for tunnels according to claim 2 or 4. The monitoring wireless signal is other than the first communication device that has transmitted the first response wired signal or the second response wired signal that the second communication device has received within the predetermined time. Transmitted to the first communication device.
The tunnel communication system according to claim 5.   The tunnel communication system according to claim 1, wherein the first wireless communication unit is a multi-hop wireless communication device.   The tunnel communication system according to claim 7, wherein the plurality of first communication devices are arranged with a shorter interval than a communicable distance of the multi-hop wireless communication device.   The tunnel communication system according to claim 7, wherein the plurality of first communication devices are arranged with a short interval compared to a half of a communicable distance of the multi-hop wireless communication device.   10. The tunnel communication system according to claim 1, wherein each of the plurality of first communication devices is connected to a fire detection device provided in the tunnel. 11. A monitoring device for monitoring a plurality of communication devices installed along a tunnel,
It is communicably connected to the plurality of communication devices via a looped wired communication line,
A controller that guides transmission of a response wireless signal to at least one of the plurality of communication devices when it is determined that a plurality of failures have occurred in the wired communication line;
Monitoring device. A plurality of communication devices installed along a tunnel,
It is connected to a monitoring device that monitors the communication device via a looped wired communication line so as to be communicable,
When a plurality of failures occur in the wired communication line, a wireless communication unit that performs multi-hop wireless communication,
Communication device. A plurality of first communication devices installed along a tunnel, a second communication device that monitors the plurality of first communication devices, the plurality of first communication devices, and the second communication device; A communication method in a communication system for tunnels including a looped wired communication line that connects to each other in a communicable manner,
The second communication device transmits a monitoring wired signal to the plurality of first communication devices via the wired communication line,
The second communication device receives a response wired signal to the monitored wired signal from each first communication device via the wired communication line within a predetermined time after transmitting the monitored wired signal. If not, directing transmission of a response radio signal to at least one of the plurality of first communication devices;
A communication method.

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