JPH0227644Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention mainly relates to a wireless communication device in a concrete building such as a nuclear power plant building.

[Prior art and its problems]

The nuclear power plant building is surrounded by thick reinforced concrete walls, creating a shielding structure for radio waves. In addition, there are many measurement cables in the building.
In particular, because neutron beam detection cables are installed, wireless communication using commonly used transceivers is not possible. That is, the radio waves emitted from the transceiver may introduce noise into the neutron detection cable and other parts, which may cause the detection circuit to malfunction. Therefore, it was previously decided to set up temporary telephones on each floor, but since the number is limited,
I felt inconvenienced by telephone calls and other calls.

[Purpose and structure of the invention]

Therefore, the present invention aims to eliminate the above-mentioned problems and provide a device that can communicate anywhere within a construction site, and its configuration is as follows.

That is, the wireless transmitter of the fixed station is connected to the ground wire network installed inside the building. Then, weak communication radio waves are emitted from each ground wire to the vicinity thereof, and the radio waves are received by a portable wireless receiver.

[Example of idea]

Next, embodiments of the present invention will be described based on the drawings.

The drawing is a schematic diagram of this equipment installed inside a nuclear power plant building.

In this embodiment, each floor in the building 5 is formed with a concrete floor separating them, and each floor is also separated by a concrete wall 6. Grounding wires 1 connected to the grounding plate 2 are laid vertically and horizontally inside the building, penetrating each floor and each wall. Therefore, a wireless transceiver 3 serving as a fixed station is connected to one end of the grounding wire 1. Then, radio waves from the radio transceiver 3 are emitted to the vicinity using the grounding wire 1 as a huge antenna. As this radio wave,
As an example, it is sufficient to emit a modulated wave of about 2 MHz that is FM modulated. Workers on each floor carry a portable wireless transmitter/receiver 4 in their pockets. Therefore,
A supervisor calls the worker through the radio transceiver 3 and ground wire 1 of the fixed station. Then, the worker who has the portable wireless transceiver 4 can listen to it and respond directly with the portable wireless transmitter/receiver 4. The radio waves from the portable transmitter are connected to the ground wire 1
Alternatively, it is received by a fixed station using a separately provided antenna. Note that this communication device is assumed to only make calls, and when making a call, it can also be done by wire using a separate nearby telephone.

The present device is particularly effective for communication during cable extension work, pressure testing of piping, electrical interlock testing, and communication during emergencies.

[Effect of idea]

The wireless communication device of the present invention has the above configuration and has the following effects.

(1) This device uses the ground wire network installed inside the building as a transmitting antenna, and radiates weak communication radio waves from there. This has the effect of improving work efficiency by improving communication between workers and each worker.

(2) Also, since this device uses the ground wire network laid vertically and horizontally inside the building as an antenna, relatively weak radio waves are sufficient, and because of the weak radio waves, various signal cables and detection circuits No other adverse effects.

(3) Furthermore, since a grounding wire is always used for inspection, maintenance, or expansion of various equipment in the building, this device can be easily used at those work locations.

[Brief explanation of the drawing]

The drawing is an explanatory diagram showing an example of this device installed inside a nuclear power plant building. 1... Grounding wire, 2... Grounding plate, 3... Radio transceiver, 4... Portable radio transceiver, 5... Building,
6...Wall.

Claims (1)

[Scope of utility model registration request] The wireless transmitters of fixed stations are connected to the ground wire network installed in the building, and weak communication radio waves are emitted from each ground wire to the vicinity, and the radio waves are received by a portable wireless receiver. Wireless communication equipment inside a concrete building.