| 摘要 |
PURPOSE:To accurately confirm the burying position of metallic piping to be detected with good operation efficiency by bringing one detection current output terminal into contact with the metallic piping to be detected and bringing the other into contact with a metallic part which can feeds electricity to the blade edge of a tool for operation. CONSTITUTION:Metal to be detected is, for example, a gas pipe 1 buried underground 9. In this case, a current is generated by a detecting machine 2, sent from a cord 4 to a hammer drill 3, and then returned to the detecting machine 2 through the gap pipe 1, a gas plug 6, and the cord 4. Consequently, the detecting machine 2 in operation generates a warning tone or warning light, etc., so the accurate detection is performed with good operation efficiency.
|
