The oblique material inspection method of Cable stayed bridge

摘要

PROBLEM TO BE SOLVED: To provide a diagonal inspection method for cable-stayed bridge that can inspect whether a PC steel wire constituting a diagonal of a cable-stayed bridge is damaged or broken in an unmanned manner through remote operation.SOLUTION: Moving means having a pair of driving wheels in contact with a surface of the cable with the cable held therein is used to move, along the cable, imaging means for acquiring image data on the surface of the cable, inspection means arranged movably on an annular path arranged along an outer periphery of the cable and measuring impedance of a coil generating an eddy current in the cable, control means for placing the respective means in operation based upon a control signal from a ground side and transmitting data acquired by the imaging means and inspection means to the ground side, and a battery for supplying electric power to the respective means. On the ground side, it is confirmed based upon the image data whether the cable surface is abnormal, and if abnormality is confirmed, the region is determined as a region which needs to be inspected so as to measure impedance in all circumferential directions of the region.SELECTED DRAWING: Figure 2