The key to controlling the risk of hoisting operation is to formulate a suitable hoisting process. Only after considering the details of the hoisting process and risk factors, selecting the appropriate load factor, correctly selecting the sling and calculating the strength of the lifting lugs and rods , In order to safely complete the hoisting operation.
The safety problem of hoisting operation often comes from the unreasonable load selection of various slings and lifting lugs, and the selection of hoisting load is related to the calculated load in the hoisting process, and the calculated hoisting load is related to the determined load factor in the hoisting process. The selection of the load factor is an important issue related to the maximum control of the lifting risk.
In the design of lifting engineering, in order to account for the dynamic load caused by the change of the moving speed of the lifted object, and the imbalance caused by the asynchronous phenomenon when multiple branches (multiple slings, multiple cranes) lift a heavy object together For the influence of load, the calculated load is often used as the basis for selecting cranes and slings. The load factors specified in the existing codes and standards are shown in the table.
The above specifications are different, and most of them give a wide range. In the actual hoisting design, it still brings great confusion to the designer in determining the load factor. If the load factor is selected too large, it will cause too much margin in the selection of slings, lifting lugs, and cranes, which will increase the engineering cost; if the load factor is selected too small, it will cause the loss of lifting objects in the lifting operation. Risks such as stability damage and crane overturning.