th the rapid development of China's tower crane industry, the quantity, kind and quality of tower crane products have developed rapidly. Tower crane accidents, especially malignant accidents, have been greatly reduced, but still occur from time to time. Tracing back to its origin, there are many reasons such as design, production, installation and use. The management of each link in the life cycle of the tower crane has the manufacturing license and the installation license. The management requirements are similar to the ISO9001:2000 Quality Management System, and its requirements are strictly implemented, in theory, tower crane accidents can be avoided. The design, development and use of the tower crane are not strictly controlled, however, the author thinks that the quality source of the tower crane ——
L68A1 Mast Section