Abstract: According to the features of major engineering works, implementing upper air maintenance for fracture crack and distortion of largescale tower crane metal structure and other metal structure in the building construction spot is the most effective method for reducing expenses and equipment maintenance time. However, there is safety risk and technical difficulty lying in this method, only the enthusiasm and creativity of the specialized technical personnel is comprehensively performed can the technical difficulty of safety construction of metal structure upper air maintenance be solved. This article puts forward relevant methods and innovative principle advices by cases for the reference of the industrial technical personnel.

Key words: carnage equipment, metal structure, upper air maintenance, safe construction technology