| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and a device for detecting contact position of embedded pipes capable of easily and accurately detecting a metallic contact position of a pair of embedded pipes by eliminating difficulty in measurement of a voltage change when alternating current leaks into the ground from a coating film damaged part of the embedded pipes. SOLUTION: Change of a current value of the pipe current of the embedded pipe is measured with a measuring pig moving inside one or the other embedded pipe by applying direct current between one embedded pipe 10 and the other embedded pipe 20. Change of the current direction of the pipe current is measured with a measuring pig moving in the other embedded pipe 20 by applying direct current between one embedded pipe 10 and the ground. Furthermore, the measuring pig 40 is formed of a pair of wire brushes 41 and 42 and a connection part 43 having flexibility to arrange both the wire brushes with a predetermined interval between them. COPYRIGHT: (C)2004,JPO
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