Note, we are not talking about synchronised lifts here. Upending a vertical vessel using two cranes, one at the top end and a tailing crane on the bottom end is also considered a multi-crane lift. Put simply, multi-crane lifts are those which involve two or more cranes to support a load either with hooks attached directly to the load by slings, through shackles attached to pad eyes, or directly to an equaliser beam. I encourage you to do your own research in this regard, but I will attempt to provide some general things to be considered when planning and executing a multi-crane lift. Therefore, I must preface this article by saying it will not be possible for me to outline the specific requirements of your local region. Guidelines differ between states and countries. There is also often a layer of state or local guidelines to meet, which can be at odds with national standards. The Australian Standards or international equivalents can be difficult to interpret. As an industry, we generally struggle with multiple crane lifts. Multiple crane lifts are among the most technically complex lifts to plan and execute. It’s always important to properly plan any lift, but even more so when there are several cranes involved. It figures – right? Double the equipment, double the personnel, double the consequences! The complex nature of lifts involving multiple mobile or crawler cranes makes them particularly hazardous. When there are two or more cranes involved in an incident, the impact and outcome of the incident is often magnified. If you are new to crane operation and require the help of a professional, contact us today to learn more about our top-rated crane rigging and lifting services.Several of the most high-profile crane accidents of recent times have been those involving multiple cranes (also referred to as tandem lifts). Understanding your equipment is the key to a safe and successful construction job. Crane operators should check if the machine comes with a guide, and refer back to it before each job.
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hC = Lifting height multiplied by the capacityĭepending on the specific type of crane you are using, this piece of equipment may come with a convenient load chart, which will allow you to estimate the crane load capacity without extensive calculations.The standard calculation for maximum crane capacity is (r)(hC)/100.Measuring the dimensions of this triangle will allow you to achieve an accurate crane load calculation. Elements, which should be measured include the boom, hoist and the ground, which form a triangle. To get a precise crane load calculation, you will need to know the geometry of the machine. These factors will help determine the machine’s ability to hold weight and remain stable during operation.
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Crane operators should note the type of crane, whether the crane will be mobile or stagnant while carrying the load, and whether a lattice jib will be used during operation.
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Numerous factors affect a crane’s ability to hold weight, which is why the smallest mistake in a calculation can lead to costly crane repairs and serious injuries.īefore beginning your calculation, it is important to understand the specific equipment that is going to be used.
CRANE LIFT PLAN CALCULATIONS HOW TO
Continue reading to learn how to calculate the load capacity of your crane before operation.Ĭrane operators who are not familiar with load calculations should consult a professional before relying on their calculation as a lifting guide. Crane operators must recalculate this amount each time they use this piece of equipment, as it can vary depending on the position of the hoist and the lift range among other factors.Īt Bobcat Contracting, our qualified crane operators provide some of the best crane lifting services in the United States. To safely operate a crane without dropping the load or damaging the machine, it is essential to know the crane load capacity.