| 摘要 |
PROBLEM TO BE SOLVED: To provide an inspection method of easily inspecting a curing state of resin lining the inner peripheral surface 3 of a buried pipe 1. SOLUTION: An impact is applied to a striking position of each of a buried pipe 11 where fiber reinforced plastic material 4 lining the inner peripheral surface 3 is cured and a buried pipe 11 to be inspected, the frequency spectrum is measured at a measuring position separated from the striking position by a predetermined distance, the ratio between the area about the frequency spectrum in a predetermined high frequency range and the area about frequency spectrum in a range including the predetermined low frequency range is calculated as a cure value, and the curing state of the fiber reinforced plastic material 4 of the buried pipe 1 to be inspected is determined by comparing the cure values of both buried pipes 1 with each other. COPYRIGHT: (C)2008,JPO&INPIT
|
