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驻马店市某预制厂新购进的40吨门式起重机,在安装过程中突然倒塌,造成一人重伤、两人轻伤,直接经济损失40余万元。该起重机的主梁是由不同型号钢焊接并通过销轴连接而成的双梁、三角形桁架结构,支腿采用无缝钢管。设计提升高度为15m,跨度30m,大车起吊重量为40吨。一、事故现场
The newly purchased 40-ton gantry crane of a prefabricated factory in Zhumadian City collapsed suddenly during installation, resulting in one serious injury and two minor injuries. The direct economic loss was over 400,000 yuan. The main girder of the crane is a double-beam, triangular truss structure welded by different types of steel and connected by a pin, and the leg is made of seamless steel pipe. Designed to enhance the height of 15m, span 30m, cart lifting weight of 40 tons. First, the accident scene