| 摘要 |
PROBLEM TO BE SOLVED: To provide a nondestructive inspection method and a nondestructive inspection device capable of detecting a break of a reinforcing-bar inside of concrete even if covering of concrete is superficial.SOLUTION: According to a nondestructive inspection method for detecting whether a reinforcing-bar 2 is broken or not by magnetizing the reinforcing-bar 2 in a concrete body 1 from a surface 1A by means of a magnet 5 and then measuring a magnetic flux density on the surface 1A of that concrete body 1, the magnet 5 is moved from right above the reinforcing-bar 2 along a length direction of the reinforcing-bar 2, the reinforcing-bar 2 is magnetized along the length direction and thereafter, the reinforcing-bar 2 is magnetized again along the length direction by moving the magnet 5 at a surface position of the concrete body 1 on a neighboring reinforcing-bar 2 along the length direction of the reinforcing bar 2A. A magnetic sensor is then moved along the length direction of the reinforcing-bar 2 on the surface of the concrete body 1, and a magnetic flux density on the surface 1A of the concrete body 1 is measured, thereby detecting whether or not the reinforcing-bar 2 is broken. |
