| 摘要 |
PROBLEM TO BE SOLVED: To quickly and accurately measure the load stress of the web part of an I-steel structure by using a stress-measuring head with a magnetostriction sensor. SOLUTION: A stress-measuring head 1 is provided with a magnetostriction sensor 11 for obtaining the load stress of an object to be measured by utilizing magnetic anisotropy due to magnetostriction effect, while U-shaped yokes in that an excitation coil and a detection coil are wound are arranged orthogonally at the center of a yoke saddle part each other, a motor 12 for rotating the sensor 11, and an encoder 13 for measuring the rotary angle of the sensor 11. Further, a demagnetization head 2 for demagnetizing the object to be measured, a head-supporting stand 3 for mounting a stress-measuring head 1 and the demagnetization head 2, scanning mechanisms 4 and 5 that are fixed to an I-steel structure and scan the head-supporting stand 3 on its web surface 61, and a control device for controlling the scanning mechanisms, are provided, thus constituting the stress-measuring device.
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