The main load-bearing structure of the tower crane increases the calculated stress of the structure due to corrosion or wear. When it exceeds 15% of the original calculated stress, it should be scrapped. Tower cranes without calculation conditions should be scrapped when the corrosion depth reaches 10% of the original thickness.

The main load-bearing structural parts of the tower crane, such as the tower body, the boom, etc., should be scrapped when the overall stability is lost. If it is partially damaged and repairable, it cannot be lower than the bearing capacity of the original structure after repair.

When cracks occur in the structural parts and welds of the tower crane, measures such as strengthening or re-welding should be taken according to the stress and crack conditions, and their development should be regularly observed during use. Tower cranes that cannot eliminate the effects of cracks should be scrapped.

The normal working life of the main load-bearing structural parts of the tower crane is calculated according to the requirements of the operating instructions or the structural working level and stress cycle level structure stress state specified in the operating instructions. If the instruction manual does not indicate the normal working life. If the structural work level is specified and cannot be determined by the tower crane manufacturer, the normal use of the main load-bearing structure of the tower crane should not exceed 1.25 x 10^5 working cycles.

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