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(1)事故主要类型一是倾翻事故。这是自行式及塔式起重机最常见的事故,大多是由于作业前支承不当所致。如地基不平或松软,而支腿或履带下没有铺设专用垫木或路基板(钢板);支腿未能全部伸出而仍按原性能表中的说明使用;起重机力矩限制器等安全装置失灵,超力矩起升重物导致其倾翻。
(1) One of the main types of accidents is a rollover accident. This is the most common accident with self-propelled and tower cranes, mostly due to improper support prior to operation. If the foundation is not flat or soft, and no special padding or road base plate (steel plate) is laid under the legs or tracks; the legs can not extend all the time but still use according to the original performance table; safety devices such as crane torque limiters are not working , Overtorque lifting heavy objects cause it to turn over.