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In the lifting operation of lifting machinery, it is very dangerous to be under the suspension rod, under the lifted object, in the pre lifting area of the lifted object, in the triangular area of the guide pulley steel rope, around the fast rope, standing on a diagonal hook or in the direction of force on the guide pulley, etc. Once danger occurs, it is not easy to avoid it. So, during operation, the position of the staff is very important. They not only need to pay attention to themselves at all times, but also need to remind each other and check implementation to prevent accidents.
In lifting operations, workers often rely on continuous use without a correct understanding of the coefficient of lifting equipment, resulting in overweight operations always being in a dangerous state. Lifting operations are different from many construction projects, involving a large area and often using different units and types of cranes. Differences in daily operating habits, performance, and command signals can easily lead to misoperation, so special caution should be taken.
During the dismantling of large lifting equipment, the steel ropes wrapped around the drum of the crane or motorized winch are arranged loosely, causing the fast ropes under heavy loads to be pulled into the rope bundle, resulting in severe shaking and instability of the fast ropes. As a result, there is often a danger of continuing the operation and the embarrassing situation of being unable to stop. The lack of theoretical calculations for setting up lifting tools or using pipelines, structures, etc. as lifting points to lift objects, and the insufficient bearing capacity or local bearing capacity of lifting tools, pipelines, structures estimated based on experience, can cause instability in one area and lead to overall collapse.
There are many accidents that occur when the lifting work has already ended, and when the hook is running with an empty rope, the free state of the lifting rope grabs the lifted object or other object that has been unhooked. If the operator or the commander of the double beam crane does not respond in a timely manner, the accident will occur instantly, and such accidents have very serious consequences for the operators and lifting equipment.