Fibermax crane pads have standard foot placement targets to assist with proper pad float placement.
Crane bearing mats.
Crane tech teaches a 4 step process.
Simply divide the maximum outrigger load by the allowable ground bearing pressure to determine the pad area you need.
Outrigger pont loading based on 25tground bearing pressure weight of crane weight of load ground bearing pressure weight of crane 72t weight of counterweight 60t 132t weight of load 11 4t.
Determine area by calculating force pressure.
These loads will be significantly lower than the above worst case scenarios noted above and are produced from crane specific software produced by the crane manufacturer.
Mat size mat size deducted from point load in 3 in kns soil type value 2 73500 x 9 81 721 035 kns.
Determining the load exerted by mobile crane outriggers or crawler crane tracks determining the suitability of the crane mats and bearing capacity of different types of soil.
This paper is used as a reference in keith anderson s book rigging engineering basics in the chapter on load spreading for mobile cranes.
The crane outrigger float should be placed squarely in the center of an outrigger pad or crane mat.
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Calculate the force exerted on the ground i e.
Responsibility as with all activities on construction sites the effective management of the safety of lifting.
This is the pressure the soil can withstand.
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When using this type of loading it is important to ensure an appropriate factor of safety is included in consideration of ground bearing capacity mat size.
Outrigger pads floats placed outside target area center of the pad mat will result in non uniform ground bearing pressures.