| 摘要 |
PROBLEM TO BE SOLVED: To make it possible a tunnel radio communication assist facility that is able to be simply and easily installed even in an existing tunnel without having an impact on a tunnel skeleton and is low in cost.SOLUTION: An antenna 18 is provided at a fire extinguisher housing device 12 installed at a predetermined interval in a tunnel 10, and a splitter 16 is housed in the fire extinguisher housing device 12. A power supply coaxial cable 26 is laid from a fire radio connection box 20 and police radio connection box 22 installed at an entrance of the tunnel via a shared device 24, sequentially going through fire extinguisher housing devices 12 in the tunnel 10, to another fire radio connection box 20 and police radio connection box 22 installed at an entrance of the tunnel via a shared device 24. An input terminal and an output terminal of the splitter 16 installed in the fire extinguisher housing device 12 are connected to the power supply coaxial cables 26 situated on both sides of the splitter 16, and the antenna 18 is connected with a branch terminal. |
