ワイヤロ-プの破断事故原因に関する調査と分析

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A wire rope because of its tensile strength and great flexibility (as mechanical properties of metal), and the availability in various sizes and types is used for construction, transportation and cargo handling machinery. Thus for, it appears that wire ropes are generally accepted expendable items (in contrast to irreplaceable items) and consequently the handling of wire ropes is somewhat thought lightly upon. Moreover, there is a tendency of twisting due to the great stretch of wire ropes and also become comparatively weak when lateral compression occurs. Consequently there should be caution in its use. The authors of this paper systematically investigated and analyzed an accident of wire rope which occured in Aza port, Naha City. The investigation included the investigation of operation of maintenance of wire rope and the visual identification of the damaged part (pile driver engine, anvil, knob of pile driver engine, pully, damaged wires). Through a close examination the main factors of the probable cause of the accident were as follows. 1) The wire rope did not travel on its normal functional path but instead deviated and became caught on a knob of the engine. 2) There were scars on the knob caused by the wire rope during its movement on its deviated path. 3) The scars on the knob were obserbed as definite singular cuts caused by the wire rope each time it contacted the knob (on its deviated path). 4) The cause of the accident as determined by the authors, coincide with the testimony given by the workers who were present at the site of the accident. 5) The result of experiments with wire rope passed through a path with one axle having shapes other than a normal pully, the strength of the rope diminished by about 40%. The five points listed above can be considered as the direct cause of the accident.
琉球大学理工学部の論文

著者

真喜志康二
琉球大学

ワイヤロ-プの破断事故原因に関する調査と分析

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