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某单位1台2005年购置、臂架长度为37m的4节臂某型混凝土泵车,在混凝土泵送结束、开启自动泵送清洗时,第一节臂(最下面)液压缸耳环被反向拉断,造成泵车臂架整体倾倒事故。事故发生前,该车停放的工作场地地面平整、坚实,满足承载要求,支撑水平度也未超过使用说明书中规定值。事故发生时,臂架在泵车前方完全伸直,正处于垂直布料状态。事故发生后,第三、第四节臂完全落地。
A unit purchased in 2005, boom length of 37m 4-arm type of concrete pump truck, concrete pump at the end of the open automatic pump cleaning, the first arm (the bottom) hydraulic cylinder earrings are reversed Pull off, resulting in the entire pump arm dumping accident. Before the accident, the car parked on the ground smooth and solid workplaces, to meet the bearing requirements, the support level did not exceed the value specified in the instructions. At the time of the accident, the boom was completely straightened in front of the pump truck and was in a vertical position. After the accident, the third and fourth arm completely landed.