| 摘要 |
<p>PROBLEM TO BE SOLVED: To remarkably shorten the earth wire exposed to the outside of a pole to surely obtain grounding with good appearance, by providing an earth terminal on the surface of pole consisting of reinforcing steel and concrete, and then electrically connecting the earth terminal to the reinforcing steel. SOLUTION: An earth terminal 4 is previously provided to cage type reinforcing steels 2, 3 by welding 9. The earth terminal is buried at two positions to the upper and lower underground areas of the pole. The earth terminal 4 is formed of a metal material having a cylindrical shape in which a threaded hole enabling screwing of a bolt type plug 6 is provided. Here, concrete 1 is applied around the reinforcing steels 2, 3, thereby exposing the external side of earth terminal 4 to the surface of pole. The end portion of an earth wire 8 has an annular connector 7 and is connected to the earth terminal 4 with a bolt plug 6. Therefore, the earth wire 8 is electrically connected to the reinforcing steel 2 via the connector 7 and the earth terminal 4, and the reinforcing steel 2 itself is working as the earth wire. As a result, it is no longer required to provide a longer earth wire along the surface of pole preventing deterioration and breaking of the earth wire.</p> |
