The 1 accident process

In 2004, a LTMl170 type truck crane in the loading and unloading of goods, because the leg pin is not fixed and the level of support legs extend only half, right behind the driver from the crane to hoist cargo, lateral rotation, rollover, resulting in serious injury boom.

Analysis of 2 accidents

The field survey and measurement: Crane hoisted weight does not exceed the operating conditions of the rated lifting weight. But at that time due to the restricted conditions of the construction site, the operator in a leg only played half a leg and not fixed pin. The leg is not fully open the case using the original performance crane, crane from behind in return to the side, because the actual lifting torque exceeds the crane "rated lifting moment" (in the leg is not fully open the case, the actual "rated lifting force moment" is smaller than the original performance table in the rated lifting moment) crane, jib damaged caused by rollover.

The 3 accident lessons to be learned

This is in the leg is not completely open under the condition of overload truck crane hoisting operation causes tilting accident according to the original lifting performance table. We should draw lessons from the accident the following:

(1) performance curve of truck crane is extended under rated in the leg lifting capacity. The leg is not fully open the case, the lifting capacity is less than the numerical designation performance on curves. Therefore, when the lifting operation, must the legs fully extended, bearing plate should be firmly connected to the leg, leg should be reliably support.

(2) crane operators should be strictly in accordance with the rules of operation. Do not meet the prescribed conditions in the workplace, should be the spirit of "safety first" principle, coordination, improve and create conditions, make the crane can be run in the rules allow the working conditions, and not subjective, depending on the experience or the executive will, most probably it did not actually happen to change the operation essentials, illegal.

The terms, provisions, breach of which 4 Standard Specification

The accident was due to violation of the following provisions:

(1) "the people's Republic of China National Standard -- crane safety rules" (GB6067-85) of the 5.1.2.2 driver operation, shall comply with the following requirements: h. mobile crane, the work should be according to the specification requirements flat parking space, firmly and reliably good support.

(2) "Regulations on safety inspection of special equipment" (State Council Decree No. 373rd) units that use fortieth special equipment shall make special equipment safety education and training for special equipment operating personnel, ensure the special operations personnel have the necessary knowledge of special equipment safety operation. Special equipment operating personnel shall strictly execute the operation rules for special equipment and the relevant safety regulations in operation.

(3) "the people's Republic of China machinery industry standard -- mobile cranes and rubber tyred crane safety regulations" (JB8716-1998) 10.10 leg lifting operation, according to the specification requirements must be firmly and reliably good support.

(4) "the people -- electric power construction safety standards for Republic of China electric power industry" (DL 5009.l-2002) of the 10.2.2 mobile crane:

(5) should be a good whole leg before other operating cranes and rubber tyred crane operation car.