290HC Mast Section Repair and maintenance of metal structure parts of tower crane
1. Strictly implement the scrapping standard of crane steel structure.
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2. Check the metal fatigue strength, weld crack, structural deformation, damage and other conditions of the main stressed structural parts, check the key welds of the main stressed structural parts and the base metal of the welding heat affected zone, and handle if any abnormality is found. The inspection of structural parts shall be carried out according to the following procedures.
(a) daily inspection: the tower crane shall be inspected every 24 hours. The tower crane driver shall check the fastening of bolts at each connecting part during shift handover, and fasten them in time in case of looseness.
(b) when the tower crane makes abnormal sound, or misoperation occurs, or the safety protection device of the tower crane is found to be out of order, it shall be checked and recorded.
(c) when a project is completed and the tower crane is disassembled, engineering technicians and professional maintenance personnel shall conduct detailed inspection and make records.
3. Try to prevent structural parts from deformation and collision damage during transportation.
4. Spray paint once every six months to one year. Rust, oil and other dirt on the metal surface shall be removed before painting.
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