1、吊装时未设置警戒区域和有效的警戒维护，有人员在吊装区活动或穿越时被构件砸伤或碰伤。  

2、吊机在起吊钢柱或钢梁并进行就位临时固定时，因起吊角度过大或构件起吊点设置不合理引起吊机倾覆。

3、无专职的司索、指挥、起重驾驶人员及现场安全监督人员，违章冒险作业。

4、起吊钢丝绳安全系数过低或本身质量问题，在吊装过程中断裂导致构件坠落伤人。

5、进入施工现场的吊机未经检验合格或未报监理、总包单位审查，作业时引发事故。

1, when lifting is not set warning area and effective maintenance, and personnel when hoisting area activities or through be component parts or damaged.

2, in the lifting crane steel column or steel girder and temporary fixed in place, because of the lifting Angle is too large or component lifting point set is not reasonable cause crane overturning.

3, without full-time of cable, command, lifting the driving and site safety supervision personnel, dangerous operations manual.

4, lifting rope safety factor is too low or the quality problem itself, fracture cause artifacts in the process of hoisting falling cuts.

5, enter the construction site of the crane without inspection or supervision, total package units without reporting review, cause accidents when working.

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