Crane Bearing Mats

Once the allowable ground bearing pressure and maximum outrigger reaction force is known you re in the best position to select the right size outrigger pad or crane pads.

Crane bearing mats.

Outrigger pads floats placed outside target area center of the pad mat will result in non uniform ground bearing pressures. Fibermax crane pads have standard foot placement targets to assist with proper pad float placement. This is the pressure the soil can withstand. The first product of this work was the paper effective bearing length of crane mats which was presented at the 2010 crane rigging conference in houston.

Determine area by calculating force pressure. Responsibility as with all activities on construction sites the effective management of the safety of lifting. Crane weight and attachments plus load weight and rigging obtain the ground bearing capacity gbc permitted for the soil you are set up on. 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.

Crane tech teaches a 4 step process. 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. Simply divide the maximum outrigger load by the allowable ground bearing pressure to determine the pad area you need. Academia edu is a platform for academics to share research papers.

Calculate the force exerted on the ground i e. 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. 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. This paper is used as a reference in keith anderson s book rigging engineering basics in the chapter on load spreading for mobile cranes.

Mat size mat size deducted from point load in 3 in kns soil type value 2 73500 x 9 81 721 035 kns.