An Overhead Crane Accident Case in Zhejiang, China

When an overhead crane accident occurs, it is often caused by the illegal operation of the operator. Each overhead crane operation guide corresponds to a bloody lesson. A recent overhead crane accident in Zhejiang, China, once again illustrates the importance of professional training for crane operators.

At about 6:30 on the day of the incident, in the forging workshop of a limited company, Wei and others found that the bolt of the electro-hydraulic hammer was loose when forging the steel billet. In order to fix the bolt, Wei and his co-worker Jiang violated the safety operation rules of the crane and hung a steel column on the overhead crane as a firing pin. Wei used the remote control to operate the crane to move back and forth. Control the direction, and use the inertia generated by the movement of the overhead crane to drive the striker to swing to strike the latch.

After the first impact, Wei operated the crane to back up, and the firing pin then backed away and hit Jiang's chest, which suddenly went behind the firing pin, causing the victim Jiang to bleed to death from his chest and abdomen.

The court of Jinyun County, Zhejiang Province heard the case and held that Wei violated relevant safety operation procedures in production and operation, resulting in a major accident that killed one person, and his behavior constituted the crime of major liability accident. The court sentenced him to ten months in prison, suspended for one year and three months.

Several questions about the safe operation of hoisting machinery

1. In addition to a comprehensive inspection of the lifting machinery in use every year, the user should also conduct a comprehensive inspection in some special circumstances. In the following special cases, a comprehensive inspection is required ( ).

A. In the event of a magnitude 4.2 earthquake disaster

B. Lifting machinery has been suspended for more than half a year

C. A general lifting machinery accident occurs

D. Open-air operation is subjected to 7-level force after wind

【Answer】A

[Analysis] This question examines the special cases where a comprehensive inspection of lifting machinery is required. When learning, talk about a few special situations to memorize.

The situation of comprehensive inspection: (1) Normal situation: at least once a year for all the lifting machinery in use; (2) Special situation: stop for more than 1 year (too long), in the event of an earthquake of magnitude 4 or above or a major occurrence Equipment accidents and open-air hoisting machinery has been subjected to a wind force of level 9 or higher. Option A is suitable, with a magnitude 4.2 earthquake; option B should be suspended for more than 1 year; option C should be a major equipment accident; option D should be after experiencing a magnitude 9 wind.

2. The safety of lifting operations is closely related to the entire operation process. Before lifting, operators of lifting machinery should confirm that all preparations and the surrounding environment meet the safety requirements. Regarding the preparations for lifting, the correct one is ( ).

A. A pad must be added between the hoisted object and the sling

B. Crane outriggers must be fully extended and stable

C. The main and auxiliary lifting mechanisms shall not work at the same time

D. Items of different sizes must not be mixed

【Answer】B

[Analysis] Option A is wrong. When bundling hanging objects, the burrs of the bundled parts should be smoothed, and the sharp edges and corners should be padded.

Option C is wrong, except the design allows, it is not allowed to use the main and auxiliary hooks to work at the same time.

Option D is wrong. Items of different shapes or sizes cannot be mixed without special binding.

3. In order to ensure the safe operation of hoisting machinery, the preparation work and safety inspection of hoisting machinery should strictly abide by the regulations. Among the following safety requirements for hoisting and transportation of hoisting machinery, the correct one is ( ).

A. Rail cranes operating in the open air should stop working when the wind power is greater than level 5

b. Without protection, the hanging object shall not pass over the head of the person, and no person shall stand under the hanging object and the jib

c. When two or more cranes are used to lift the same weight, each crane must not be overloaded

D. Whether the minimum distance between the crane and other equipment or fixed buildings is more than 1m

【Answer】C

[Analysis] Option A is wrong. Rail cranes operating in the open air should stop working when the wind force is greater than level 6.

Option B is wrong, the hanging object must not pass over the person's head, and the person must not stand under the hanging object and the boom.

Option D is wrong, whether the minimum distance between the crane and other equipment or fixed buildings is more than 0.5m.

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