1987年10月23日下午,在宜昌船厂船舶生产流水线上的一台40吨门座起重机,用副钩(额定起重量为10 t)将一块由8张钢板拼接的船体甲板(总重量约8.5 t),从自动焊车间拼板工位吊出。当臂架转到和起重机轨道几乎平行,船体甲板距地面近10 m高的时候,副钩吊钩组突然落下,连同船体甲板一起坠到地 On the afternoon of October 23, 1987, a 40-ton portal crane on the ship’s production line of Yichang Shipyard was used to attach an 8-sheet steel hull deck with a total weight of about 8.5 t), hanging from the automatic welding workshop puzzle station. When the boom is almost parallel to the crane track and the hull deck is nearly 10 m above the ground, the secondary hook and hook set suddenly falls and falls together with the hull deck