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If different types of cranes are used together (i.e. Lifting operations using two or more cranes at the same time shall use cranes of the same type. That’s why when performing a multiple crane lift, a documented lift plan and procedure should be prepared by a competent person, for example, an engineer, and followed. These can occur from misalignment in cranes to load, load shifting, minor errors in centre of gravity location and general crane motions. These loadings include horizontal forces acting on the boom and additional vertical load. This example uses two cranes, the same principle can be used for three or more crane lifts, but the calculation will be much more complex as the cranes are not evenly spaced either side of the centre of gravity.įor multiple crane lifts, the movement of the load between the cranes will create extra loadings on the cranes. The closer a crane is to the centre of gravity, the more load the crane will receive.
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size, centre of gravity (CoG), lift point position) can be used in the moment equation to calculate the load distribution (see a simple example of a load share calculation on this page). Configuration of the load to be lifted (i.e. One critical control measure is to calculate the distribution of the load among the cranes and how the load distribution will change for the entire lifting process. Lifting with multiple cranes is always more complex than lifting with just one crane, so appropriate planning, engineering and operational control measures need to be in place to manage the risks associated with multiple crane lifts. If there is a large distance between lift point locations relative to the boom length, which would impact on retaining pins, localised stress distribution and other elements of the crane. If the load would be out of sight of the crane operator if it were a single crane or single crane dual hook operation. In general, these considerations may determine when you would choose a multiple crane lift (this is not a blanket fixed set of rules): Multiple crane lifts can range from rotating a column using a lift crane at the top and a tailing crane at the bottom, to lifting a pre-assembled platform with eight cranes. Multiple crane (means a lift operation that requires two or more cranes) arrangements/methods are sometimes used on lifting jobs when physical dimensions, characteristics, mass, required movement of the load, environmental restrictions or other factors prevent the lifting operation from being performed by a single crane or single hoist. Contributed by Alice Edwards, Technical Project Engineer – The Crane Industry Council of Australia (CICA)