Seek advice from the crane manufacturer or an engineer on wind sail effects – particularly for loads with a large surface area. Identify structures, plant items and powerlines which may restrict crane movement or could be contacted during the lift. However, where multiple cranes must be used, the following precautions should be followed:Ĭonduct a lift study during the planning phase (including load share and how it will be managed during the lift). It’s important to properly plan crane lifts and avoid using multiple cranes if it is possible to do so safely. Hoist rope angles can cause a push/ pull effect. Maximum rated capacity limiters not designed for this operation may not prevent the crane from operating beyond its limits Individual crane loads can increase during the lift as the load’s centre of gravity shifts or the hoist ropes move away from verticalĮach crane’s actions can affect the stability of other crane/s involved in the lift if operations are not synchronised. Using multiple cranes simultaneously to lift a load increases the risk of the lift because: Multiple cranes are simultaneously used to lift a load when it is too heavy for a single crane, or its shape requires multiple cranes to make sure it’s stable during lifting or rotate it during the lift. The load indicator wasn’t working on one of the cranes, and the load was much heavier than previously thought. In the second incident, two pick-and-carry cranes were moving a load around a corner when one of the cranes overturned. The incident could have been avoided if the beam had been tied to other Super T’s already installed, before taking the load off the hoist ropes. When the load was released from the crane hooks, the beam fell to the outside, knocking out both the temporary support brackets and a wing wall on the bridge and injuring two workers. The beam was not symmetrical, with a precast barrier attached to one side.
#MULTI CRANE LIFT DRIVER#
In the first incident, two cranes on outriggers were lifting a 50 tonne Super T bridge beam, and the driver was unable to see where the load was being placed. The developed framework's functionality is validated by implementing it into a portion of a real project in Alberta, Canada, through three different cases.Workplace Health and Safety Queensland has investigated two serious incidents involving dual crane lifts over the last two years. This framework addresses five different components regarding onsite crane operation management, including BIM-based multi-crane lift animation, scheduling and cost analyses, motion controlling in the BIM environment, safety monitoring and clash detection, and spatiotemporal site analyses. Unlike similar recent efforts, the proposed framework is built upon previously developed crane planning and optimization systems, which enables generating accurate operation plans both in micro (objects) and macro scales (site). This study introduces an integrated 4D crane simulation and onsite operation management framework for multiple concurrent mobile crane operations in the BIM environment with the support of a comprehensive database. Heavy industrial construction, particularly when modularization is adopted, requires thorough heavy-lift studies to manage the extensive use of mobile cranes in congested and dynamic site layouts.