DETECTING METHOD OF BROKEN ELEMENT WIRE OF PARALLEL-LINE CABLE FOR MOORING MARINE FLOATING STRUCTURE

摘要

PURPOSE:To detect a broken element wire and its breaking position securely by inputting ultrasonic wave pulses which are easy to propagate to element wires of the parallel-line cable and detecting reflected pulses from the breaking position of the element wire. CONSTITUTION:A parallel-line cable group 1 is coated with an anticorrosive layer 2 and the cables are unbundled in upper and lower sockets 3A and 3B and fixed by charging a cast material 7 among the element wires 1. Ultrasonic wave pulses of specific frequencies of 20kHz-50MHz easy to propagate in the element wires are inputted to the element wires 1 through an ultrasonic testing device 5 and a converter 4, so that transmit pulses and reflected pulses from the breaking position are both displayed on a display device 6. Then, the breaking position is calculated from the time interval and propagation speed of the ultrasonic wave.