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Thus, we can see that the load on crane 1 increases by lbs or The increase in load must be accounted for in the lift plan. Using the same calculation method as given before, for Figure 2 we calculate that Load 1 will increase to 5, Lbs and Load 2 will drop to 4, Lbs. When this situation occurs, the load distribution will change as the load tips up. In Figures 1 and 2, the lugs are at different heights and if we drew a line between the lug holes, the CG does not lie on that line. How much the distribution changes will depend on the geometry of the load. Tipping Up The Load Once we begin tipping up the load, we may find that the load distribution between the cranes changes. Obviously, the worse our guess, the more inaccurate our assumed load distribution.Īlso, where the distance between the lugs gets smaller, the accuracy of our guess makes a lot more difference to our assumed load distribution. This might seem like a lot, but taking all measurements in feet for Figure 3, the discrepancy is only 6 inches.
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Intel 660p series m 2 2280 1tb reviewĪs mentioned above, we are left to guessing its location. In this case, the relative height of the lugs and CG is not a factor in the calculations. Note that distances are measured to the lift lug holes from the CG. Calculating Load Share Once we have the necessary data, the load share for each crane can be determined. Remember, if we guess at the CG location, we are guessing at the load weight which can lead to accidents. However, the load distribution cannot be calculated accurately without it and this must be impressed upon the owner of the load if the lift is to be done safely. Of these three factors, the hardest to get is usually the CG. These are the load weight, the load center of gravity CGand in some cases, the load geometry. To obtain this most basic piece of information for a multi-crane lift, three factors must be known first. This is generally due to the load interaction between the cranes. One source described two crane lifts as being more than twice as risky as single crane lifts with even more disproportionate increases in risk as more cranes are added. Multiple crane lifts can be tricky business.