132HC Mast Section Tower Hang Maintenance System-Steel Wire Rope and Its Maintenance
1. Steel wire ropes shall be used to prevent wire ropes from being wound, twisted, bent or glued to debris during use, and to prevent friction with mechanical or other debris.
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2. After the tower crane is installed(before use), the wire rope shall be lubricated, and the graphite grease shall be applied again. Afterwards, the lubrication of the wire rope shall be carried out according to the "crane lubrication meter".
3. The overall design of the tower crane does not allow the wire rope to have an indefinite life. It should be scrapped in one of the following cases:
A. Steel wire rope 6 × 19-d(D wire rope diameter) The number of broken wires in 6D length exceeds 5, and the number of broken wires in 30D length exceeds 10.
B. Steel wire rope 6 × 37-d(D steel wire diameter) The number of broken wires in 6D length exceeds 10, and the number of broken wires in 30D length exceeds 19.
C. The wire ropes are close together and should be scrapped even if the number of broken wires does not exceed 5 in 6D length.
D. Although the wire rope is not broken, the wire rope wears 40 % of its diameter, or when the wire rope decreases by 7 % or more relative to the nominal diameter, or the wire rope is obviously bent.
E. The wire rope loses its normal shape and produces deformities, such as waves, cage-like distortions, rope extrusion, wire extrusion, local enlargement of the rope diameter, twisting, partial reduction of the rope diameter, partial compression, and bending.
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