132HC Mast Section What are the quality problems of the tower crane itself causing the accident?
Design problems: there are defects in the design of moment limiter, poor sensitivity; unreasonable stress in the design of steel structure, defects in the design of hydraulic system, etc.
132HC Mast Section：
http://www.towercranesupply.com/product/132hc-mast-section-liebherr-tower-crane
Parts problems: quality problems of moment limiter components, steel materials used in steel structure, quality problems of hydraulic system components, etc.
Manufacturing problem: the welding of steel structure fails to meet the requirements. The height of the weld is not enough, and there are defects such as porosity, slag inclusion and even faulty welding, especially the welding quality problems in the important connecting parts of tower cap, tower crane arm, balance arm and other parts. The geometric dimension of steel structure does not conform to the requirements. The blanking is not in accordance with the requirements, and the cross-sectional dimension of steel fails to meet the national standards.
132HC Mast Section：
http://www.towercranesupply.com/product/132hc-mast-section-liebherr-tower-crane
Problems of factory certificate and instruction manual: without factory certificate, it is a fake and inferior product. There is no batch description and no indication of changes to the original design.
132HC Mast Section：
http://www.towercranesupply.com/product/132hc-mast-section-liebherr-tower-crane
