Rank: Forum user 
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Hi
Can someone provide reference or link to Bearing Pressure Calculation / Calculator when lifting with:
- mobile crane 4 x outriggers
- mobile crane tracked
Also
- Lifting with excavator - along the tracks / across the tracks
Thanks - Tom.
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Rank: Super forum user 
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 1 user thanked gerrysharpe for this useful post.
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Rank: Super forum user
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I think you are asking about the imposed load rather than the bearing capability of the soil.
You will need the surface area of each outrigger or contact area of each track (call this A),the number of bearing points (N) and the all up weight of the crane plus the load to be lifted (W)
Thus imposed load per outrigger(IL) =W/(N)
and per unit area IL/A
This only relates to a static uniform loading and as the jib is rotated and extended the imposed load at each outrigger changes
This gives a first order estimate but the best bet is to get the Engineer to calculate it accurately
Edited by user 25 March 2017 19:30:43(UTC)
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1 user thanked boblewis for this useful post.
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Rank: Forum user
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Hi
Yes needed to know Imposed Load.- bad question.
I understand what you say re calculations - convert to kN/m2.
Compare this with the "Pemissable Bearing Pressure" - from BS Table.
eg. Stiff Clay 150 - 300 kN/m2 .... having divided by Factor of Safety (3).
Will give good assessment of lift.
Realise this for static lift and moment calculation for lift required to find reaction under outriggers / tracks.
Thanks - Tom
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