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1事故现象在起重机运行过程中,大车车轮在同一平面中不能同时与大车轨道接触,出现车轮悬空现象,该情况通常被称作大车“三条腿”。日前,在对一台跨度为7.5m,起重量3t的电动单梁起重机进行安装监督检验过程中,发现起重机在试运行中出现“三条腿”现象,为此安装单位虽然采取了一些措施,但仍无法完全消除“三条腿”现象。2情况分析引起“三条腿”的因素有多种,其中,四个车轮不在同一截面,主梁变形,大车轨道高低差和两边等高差大等是造成“三条腿”的主要原因。对此,对大
1 accident phenomenon During the operation of the crane, trolley wheels in the same plane can not be in contact with the trolley track at the same time, the phenomenon of wheel dangling, the situation is often referred to as cart “three legs ”. Recently, during the installation supervision and inspection of a single-girder crane with a span of 7.5m and a lifting capacity of 3t, it was found that there was a “three-legged” phenomenon in the trial operation of the crane. For this reason, the installation unit took some measures , But still can not completely eliminate “three legs ” phenomenon. 2 Situation Analysis There are many factors that cause “Three Legs ”, of which four wheels are not in the same section, the deformation of the main girder, the height difference of the trolley track, and the height difference on both sides are caused by “three legs” main reason. In this regard, big