JP6130269B2 - Tunnel radio communication auxiliary equipment - Google Patents

Description

The present invention relates to a tunnel radio communication auxiliary equipment for use in communication with the outside of a tunnel in the case of rescue activities, fire fighting activities, and the like in a tunnel.

  Conventionally, emergency equipment in road tunnels includes emergency telephones, fire alarms and other reporting / alarming equipment, fire extinguishers and fire hydrants, refuge guidance equipment, and other equipment such as wireless communication auxiliary equipment. The emergency equipment to be installed is determined according to the tunnel grade that can be extended and the traffic volume per day.

  Of these, the AA class with tunnel lengths exceeding 10,000m requires the installation of wireless communication auxiliary equipment for communication with the outside of the tunnel for rescue and fire fighting activities in the tunnel. Is in the A grade of 3000 to 10000 m, it is assumed that wireless communication auxiliary equipment will be installed as necessary.

  This wireless communication auxiliary equipment is composed of an antenna installed in the tunnel and a wireless device installed outside the tunnel mine. Leaky coaxial cables are used for the antennas installed in the tunnel. The leaky coaxial cable is provided with a slot for radiating radio waves on the coaxial cable, and is called LCX (Leaky Coaxial Cable).

Radio equipment to be installed outside the tunnel mine is used when the base station, relay station, etc. are always installed, and when the radio equipment is brought in only when necessary and connected to the aerial system using the connection terminal of the radio connection box. For example, wireless connection boxes for connecting fire fighting radios and wireless connection boxes for connecting police radios are installed.

JP 2006-155495 A

  By the way, such a tunnel wireless communication auxiliary equipment is not obliged to install in the case of class B where the tunnel extension is 1000 to 3000 m. You may want to install auxiliary equipment.

  Therefore, it is conceivable to install a wireless communication auxiliary equipment for installing a leaky coaxial cable in the tunnel as in the case of the AA grade and the A grade for the B grade tunnel.

  However, leaky coaxial cables are thick and heavy in structure, so the workability at high places is poor, and tunnel side wall mounting is standard in consideration of construction safety, and when leaky coaxial cables are laid in an existing tunnel It is necessary to attach a hanging bracket to the tunnel side wall, which has a problem of affecting the tunnel frame.

  In addition, the leaky coaxial cable is expensive because it has a special structure, and there is a problem that the cost burden is large.

  In order to solve this problem, the applicant of the present application installed an antenna in a plurality of equipment installed in a tunnel at predetermined intervals, for example, a fire extinguisher storage device, provided a branching device, and installed it in a tunnel wellhead. A coaxial cable for power feeding is laid from the wireless connection box to the other wireless connection box at the tunnel wellhead via the fire hydrant storage device in the tunnel in order, and power is supplied to the input terminal and output terminal of the branching device provided in the fire extinguisher storage device. A tunnel wireless communication auxiliary equipment has been proposed in which a coaxial cable is connected and an antenna is connected to a branch terminal (Japanese Patent Application No. 2013-136555).

  According to such a tunnel wireless communication auxiliary equipment, instead of leaking coaxial cable, an existing fire extinguisher storage device installed in the tunnel is provided with an antenna and a branching device, and the wireless connection box at the wellhead with this shaft cable. The connection eliminates the need for installation work for the tunnel housing, and allows the existing tunnel to be installed easily and easily without affecting the tunnel housing. Moreover, since it is not necessary to use an expensive leaky coaxial cable, the equipment cost can be reduced.

  Here, the installation of the antenna to the fire extinguisher storage device is performed by installing the antenna on the front face of the door that can be freely opened and closed in the housing containing the fire extinguisher, and the installation interval of the fire extinguisher storage device is 50 meters. It is necessary to install an antenna for transmitting radio waves and receiving radio waves so as to enable communication with a portable wireless communication device existing in a range of about 25 meters.

  However, when an antenna is arranged on a fire hydrant device, even if the straight tunnel can cover the communication range of about 25 meters on both sides, for example, in the case of a curved tunnel, the communication range of about 25 meters on both sides is set. It may not be possible to cover.

  In order to solve this problem, it is conceivable to install a booster equipped with a bi-directional amplification function as necessary to widen the communication range. However, when a booster is installed, a power supply device is installed in the booster. Therefore, there is a problem that the equipment configuration becomes complicated and the cost becomes expensive.

It is an object of the present invention to provide a tunnel radio communication auxiliary facility that improves the antenna characteristics provided in a fire extinguisher storage device and can easily expand a communicable area for communication connection with a radio communication device used in a tunnel. And

The present invention
An antenna that is provided in a plurality of equipment installed in the tunnel at predetermined intervals, and that is connected to a wireless communication device used in the tunnel;
A wireless connection box installed at one or both of the tunnel wellheads and having a connection terminal for connecting a wireless communication device;
A coaxial cable for power feeding installed in the other wireless connection box of the tunnel wellhead or the other of the tunnel wellhead, sequentially through the equipment in the tunnel from one wireless connection box of the tunnel wellhead,
A branch device installed inside the equipment and connected to one input coaxial cable located on both sides to the input terminal and the other supply coaxial cable to the output terminal, and an antenna connected to the branch terminal;
In tunnel radio communication auxiliary equipment equipped with
The equipment is a fire extinguisher storage device that has a door that can be opened and closed on the front of the housing, and stores the fire extinguisher in the housing.
Form an opening in the door of the fire extinguisher storage device, install the antenna,
Place a reflector behind the antenna inside the door opening,
An antenna cover is disposed so as to cover the front of the antenna that is outside the opening of the door.

  Here, the antenna cover has a three-dimensional shape schematically representing a fire extinguisher cylinder of a fire extinguisher symbol provided on the door of the fire extinguisher storage device.

In addition, as a wireless connection box, a plurality of wireless connection boxes for connecting wireless devices having different assigned frequency bands are provided, and the plurality of wireless connection boxes are connected via a duplexer having a band filter that passes a signal of the assigned frequency band. Connect to the coaxial cable for power supply.

  According to the tunnel radio communication auxiliary equipment of the present invention, an antenna is installed by forming an opening in a door that can be opened and closed on the front surface of a housing that houses a fire extinguisher of a fire extinguisher storage device, and the inside of the door opening and A reflector is placed behind the antenna, and an antenna cover is placed to cover the front of the antenna outside the door opening, so that when transmitting radio waves from the antenna, it is reflected to the radio waves from the antenna. The radio wave reflected by the plate can be added to expand the range that can be received by the portable wireless communication device, and when receiving the radio wave transmitted from the portable wireless communication device, the reflected wave is reflected by the reflector directly on the antenna. Thus, it is possible to expand the transmittable range of the portable wireless communication device by adding the incoming radio wave.

  Moreover, by installing an antenna on the front face of the door of the fire extinguisher storage device, for example, the installation work of the antenna can be performed simply by replacing the door of the fire extinguisher storage device with one having an antenna.

In addition, the fire extinguisher storage device door is provided with a fire extinguisher symbol that schematically represents the fire extinguisher, so the antenna cover that covers the outside of the antenna is imitated as a fire extinguisher cylinder in the fire extinguisher symbol. By adopting a three-dimensional shape, the antenna is not exposed on the door surface of the fire extinguisher storage device, and the antenna can be provided on the door without impairing the function of the door of the fire extinguisher storage device.

Explanatory drawing which showed embodiment of the tunnel radio | wireless communication auxiliary equipment radio-supplied from a tunnel both sides wellhead Explanatory drawing showing the equipment of B grade tunnel The perspective view which showed the fire extinguisher storage device which installed the antenna Front view showing fire extinguisher storage device with antenna Exploded view showing the case and fire extinguisher door Explanatory drawing showing the fire extinguisher door exploded Sectional drawing which showed the XX cross section of FIG. Sectional drawing which showed the YY cross section of FIG. 7, and its assembly disassembly state

[Configuration of wireless communication auxiliary equipment]
FIG. 1 is an explanatory view showing an embodiment of a tunnel wireless communication auxiliary facility that wirelessly supplies from both tunnel wellheads, and FIG. 2 is an explanatory view showing a B grade tunnel facility.

  As shown in FIGS. 1 and 2, the tunnel wireless communication auxiliary equipment of this embodiment is provided with a branching device 16 and an antenna 18 in a fire extinguisher storage device 12 installed along a supervisor passage 15 in the tunnel 10. A power feeding coaxial cable 26 is laid from one of the 10 wellheads to the other wellhead.

  The branching device 16 provided in the fire extinguisher storage device 12 includes an input terminal, an output terminal, and a branching terminal, and connects one feeding coaxial cable 26 located on both sides to the input terminal and the other feeding coaxial cable 26. Connected to the output terminal, the antenna 18 is connected to the branch terminal. The antenna 18 transmits a radio wave and receives a radio wave so as to enable communication with a portable wireless communication device existing in a range of about 25 meters on both sides.

  A fire fighting wireless connection box 20 and a police wireless connection box 22 are installed at the wellheads on both sides of the tunnel 10 via a duplexer 24. The fire fighting radio connection box 20 is provided with a power supply connection terminal inside an openable / closable door, connected to a fire fighting radio using a predetermined fire fighting radio allocated frequency in the 150 MHz band, and a radio carried by fire fighters in the tunnel. Enables conversation communication with a communication device. In the 150 MHz band fire fighting radio, 68 channels are allocated from 148.0100 MHz to 154.3100 MHz with a bandwidth of 1.6 MHz.

  The police radio connection box 22 is provided with a power supply connection terminal inside an openable / closable door, connected to a police radio using a predetermined police radio allocation frequency of 150 MHz band, and a radio carried by a police officer in a tunnel. Enables conversation communication with a communication device.

  The duplexer 24 includes a band-pass filter that passes through the firefighting radio allocation frequency and a band-pass filter that passes through the police radio allocation frequency, and connects the output of one of the two bandpass filters in common to the coaxial cable 26 on the tunnel side. Connected.

  The coaxial cable 26 is laid in the tunnel 10 through a conduit 19 installed in the duct passage 17 below the supervisor passage 15 and is started up at the place where the fire extinguisher storage device 12 is installed. A coaxial cable 26 is connected to the branching device 16 installed in the fire extinguisher storage device 12 through a through hole provided in the fire extinguisher. For this reason, installation of a mounting bracket or the like for laying the coaxial cable 26 in the tunnel 10 is unnecessary, and the tunnel housing is not affected.

  In this way, instead of the leaky coaxial cable, the fire extinguisher storage device 12 installed in the tunnel 10 is provided with the branching device 16 and the antenna 18, and the coaxial cable 26 is used for the fire-fighting wireless connection box 20 and the police wireless connection box. 22 and the duplexer 24 are connected so that the installation work for the tunnel housing is not required, and the existing tunnel can be installed easily and easily without affecting the tunnel housing. Moreover, since it is not necessary to use an expensive leaky coaxial cable, the equipment cost can be reduced.

[Installing the antenna of the fire extinguisher storage device]
FIG. 3 is a perspective view showing a fire extinguisher storage device with an antenna installed, and FIG. 4 is a front view showing the fire extinguisher storage device with an antenna installed.

  As shown in FIGS. 3 and 4, the fire extinguisher storage device 12 includes a box-shaped housing 28 opened on the front surface and a fire extinguisher door 30 provided in the housing opening so as to be openable and closable. For example, two fire extinguishers are stored.

  The fire extinguisher door 34 is provided with an opening / closing handle 36 on the right side, and a fire extinguisher symbol plate 32 using a synthetic resin or the like schematically representing the fire extinguisher is fixed to the front surface of the center with screws. The word “fire extinguisher” is drawn at the top.

  The cylinder portion of the fire extinguisher symbol drawn on the fire extinguisher symbol plate 32 is an antenna cover 34, and the antenna cover 34 has a three-dimensional shape schematically representing the fire extinguisher cylinder by projecting in an arc shape forward. As a cavity, an antenna installation space is secured, and an antenna 18 is arranged inside.

  FIG. 5 is an explanatory view showing the housing and the fire extinguisher door in an exploded manner, FIG. 5 (A) shows the housing, and FIG. 5 (B) shows the fire extinguisher door.

  As shown in FIG. 5, the housing 28 of the fire extinguisher storage device 12 has a box shape with a door opening 40, is formed by sheet metal processing, and has hinge receiving portions at two upper and lower positions on the left side of the door opening 40. 42, and a magnet latch 44 is provided in the approximate center on the right side of the door opening 40 so that the fire extinguisher door 30 can be sucked and held.

  The fire extinguisher door 30 is provided with two hinge portions 46 on the left and right sides, and is fitted to the hinge receiving portion 42 of the housing 28 so that the fire extinguisher door 30 can be freely opened and closed. In the fire extinguisher symbol plate 32 fixed to the front face of the fire hydrant door 32, the antenna 18 is arranged inside the antenna cover 34 that becomes a fire extinguisher cylinder part, and the reflection plate 38 is arranged behind the antenna 18.

  FIG. 6 is an exploded view of the fire extinguisher door, FIG. 6 (A) shows the fire hydrant door, FIG. 6 (B) shows the fire extinguisher symbol plate, and FIG. 6 (C) shows the antenna cover. Show.

  As shown in FIG. 6, an opening 48 is formed at a position where the antenna cover 34 of the fire hydrant door 30 is attached, and the antenna 18 erected on the antenna base 50 by the attachment angle member 52 a is disposed at the opening 48. . Further, behind the antenna 18, a reflection plate 38 is disposed by mounting angle members 52a and 52b.

  The fire extinguisher symbol plate 32 penetrates the fire extinguisher cylinder portion to form a cylinder opening 54. The cylinder opening 54 has the same shape as the opening 48 formed in the fire extinguisher door 30, and when the fire extinguisher symbol plate 32 is fixed to the front surface of the fire extinguisher door 30 with screws, the opening 48 and the cylinder opening 54 overlap each other. It becomes an opening.

  The antenna cover 34 is integrally formed with a flange portion 56 around a cover main body 55 simulating a fire extinguisher cylinder portion in a three-dimensional shape, and is fitted into an opening 48 formed in the fire extinguisher door 30 from the inside. Thus, it can be fixed to the back of the door with an adhesive, for example.

  The material of the fire extinguisher symbol plate 32 and the antenna cover 34 is made of synthetic resin or fiber reinforced plastic (FRP) that hardly changes the gain of the antenna 18.

  7 is a cross-sectional view showing the XX cross section of FIG. 4, and FIG. 8 is a YY cross section of FIG. 7 (see FIG. 8A) and its assembled and disassembled state (see FIG. 8B). FIG.

  As shown in FIG. 8, two fire extinguishers 66 are housed in the housing 28 of the fire extinguisher storage device 12 as indicated by an imaginary line, and a portion of the opening 48 formed in the fire extinguisher door 30. The antenna 18 is arranged vertically upright, and a reflector 38 is arranged behind the antenna 18.

  As shown in FIG. 8B, the mounting structure of the antenna 18, the antenna cover 34, and the reflector 38 to the fire extinguisher door 30 is obtained by attaching the antenna cover 34 from the inside to the opening 48 of the fire hydrant door 30 with an adhesive or the like. The fire extinguisher symbol plate 32 is fixed to the outside of the opening 48 with screws 64.

  The antenna base 50 from which the antenna 18 is erected is fixed to a mounting angle member 58. The mounting angle member 58 is fixed to a mounting angle member 52a with screws 60. Further, the mounting angle member 52a is placed inside the fire hydrant door 30. The antenna 18 is fixed by welding or the like so that the antenna 18 enters the opening 48 of the fire hydrant door 30.

  Mounting angle members 52a and 52b are fixed by welding or the like at two locations above and below the opening 48 formed in the fire hydrant door 30, and the upper mounting angle member 52b is a lower mounting angle member on which the antenna 18 is disposed. The reflector plate 38 made of a conductive material is fixed to the back of the mounting angle members 52a and 52b fixed in two places at the upper and lower portions with the screw 62, and the reflector plate 38 is disposed behind the antenna 18. Yes.

  In this way, the opening 48 is formed in the fire hydrant door 30 of the fire extinguisher storage device 12 and the antenna 18 is installed. The reflector 38 is disposed behind the antenna 18 inside the opening 48 of the fire hydrant door 30. Since the antenna cover 34 is disposed so as to cover the front of the antenna 18 outside the opening 48 of the door 30, the communicable range by the antenna 18 can be expanded by providing the reflector 38.

  For example, the range in which the radio wave transmitted from the antenna 18 can be received by the portable wireless communication device is expanded by adding the radio wave radiated forward from the antenna 18 and reflected by the reflector 18 to the radio wave radiated forward from the antenna 18. To do.

  Further, the range in which the radio wave transmitted from the portable wireless communication device can be received by the antenna 18 is the same as the radio wave that arrives directly at the antenna 18 and is reflected by the reflector 18 and arrives at the antenna 18. Expanding.

[Modification of the present invention]
In the above-described embodiment, the flat reflector plate is disposed behind the antenna when viewed from the plane, but the reflector plate may have a curved plate shape or a bent plate shape when viewed from the plane.

  In addition, it is desirable that the position of the reflector installed behind the antenna is arranged at an appropriate position where the communicable range can be expanded within a range that does not hinder the storage of the fire extinguisher in the housing.

  Further, in the above embodiment, the antenna is arranged in the opening portion formed in the fire hydrant door. However, jumping forward of the antenna cover simulating the three-dimensional shape of the fire extinguisher cylinder part may impair the symbol display. By enlarging in a range that is not present, the communicable range may be expanded by arranging the antenna in a forward position as far as possible from the opening formed in the fire extinguisher door.

  Moreover, the attachment structure of the antenna and the reflecting plate with respect to the fire extinguisher door shown in the above embodiment is an example, and an appropriate attachment structure may be used as necessary.

  In the above embodiment, the fire extinguisher storage device is taken as an example of the equipment for installing the branching device and antenna of the tunnel wireless communication equipment. However, like the fire extinguisher storage device, a door is provided on the housing. You may make it provide in the other appropriate equipment provided.

  Further, the above-described embodiment is an example in which tunnel wireless communication auxiliary equipment is provided in an existing tunnel, but the present invention can be similarly applied to a new tunnel.

  In the above-described embodiment, signals from the radio and / or police radio connection box are combined into a tunnel and supplied to the tunnel. An FM radio rebroadcast device or the like may be connected as necessary.

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

10: Tunnel 12: Fire extinguisher storage device 14: Illuminating device 16: Branch device 17: Duct passage 18: Antenna 19: Conduit 20: Wireless connection box for fire fighting 22: Wireless connection box for police 24: Duplexer 25: Wireless connection Box 26: Coaxial cable 28: Housing 30: Fire extinguisher door 32: Fire extinguisher symbol plate 34: Antenna cover 38: Reflecting plate 48: Opening

Claims (3)

An antenna that is provided in a plurality of equipment installed in the tunnel at predetermined intervals, and that is connected to a wireless communication device used in the tunnel;
A wireless connection box provided with a connection terminal for connecting a wireless communication device, installed at one or both of the tunnel wellheads,
A coaxial cable for power supply laid in the other wireless connection box of the tunnel wellhead or the other of the tunnel wellhead through the equipment in the tunnel from one wireless connection box of the tunnel wellhead,
A branching unit installed inside the equipment and connected to one input coaxial cable located on both sides to the input terminal and the other feeding coaxial cable to the output terminal, and the antenna connected to the branch terminal; ,
In tunnel radio communication auxiliary equipment equipped with
The equipment is a fire extinguisher storage device that includes a door that can be opened and closed on the front surface of the housing, and stores the fire extinguisher in the housing.
Form the opening in the door of the fire extinguisher storage device and install the antenna,
A reflector is placed behind the antenna that is inside the door opening,
A tunnel radio communication auxiliary equipment, wherein an antenna cover is disposed to cover the front of the antenna that is outside the opening of the door.
2. The tunnel radio communication auxiliary equipment according to claim 1, wherein the antenna cover has a three-dimensional shape schematically representing a fire extinguisher cylinder of a fire extinguisher symbol provided on a door of the fire extinguisher storage device. Tunnel radio communication auxiliary equipment.
In the tunnel radio communication auxiliary equipment according to claim 1,
As the wireless connection box, a plurality of wireless connection boxes for connecting radio devices having different assigned frequency bands are provided, and a duplexer provided with a band filter for passing the signals of the assigned frequency band through the plurality of wireless connection boxes. A tunnel radio communication auxiliary facility, which is commonly connected to the power supply coaxial cable via the cable.

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