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Allowable foundation settlement - portal crane 3

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mte12

mte12

Structural
Joined
Mar 1, 2022
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146
Location
AU
Has anyone seen a specification for allowable settlement of foundations for a traveling portal crane.
Is there a general allowance or does it depend on each portal crane specifically.
The size of the crane is somewhere between 100t to 500t.
There is a strip footing along each track. I'm not sure if piling is normally required. Ground locally, will consist of imported sand fill most likely.
Untitled_tdapnu.png
 
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if if there was a specification I would still go to the manufacturer and have them confirm.
 
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Thanks.
We don't have a manufacturer yet. This is still early stages.
 
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I think this is very manufacturer driven.

I wouldnt be making any guesses. Id let your client advise what to adopt at these preliminary stages.
 
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OK thanks.
I was aware it has something to do with travelling, and how much incline the motors can overcome.
But we don't have a specification though.
 
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Skempton suggests that at differential settlement of L/300, overhead cranes are expected to have difficulty.

So likely less than that

----
just call me Lo.
 
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For preliminary study purposes, a mat foundation should be considered to support the tracks without worrying too much about the deflection, which shall be fine-tuned after receiving guidance from the manufacturer.
 
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In my experience, thats a poor plan le99 -- likely to lead to cost surprises and upset owners later on. Especially in regions where the cost of shallow foundations and piled foundations are widely different.

These cranes are sensitive to any deflection (including settlement) and this is a good question to ask early.

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just call me Lo.
 
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Thanks for the responses.
The attached document from Retrograde is quite useful.
 
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OP said:
There is a strip footing along each track. I'm not sure if piling is normally required.
Click to expand...

Sorry to have missed that line. The idea of "mat foundation" is based on the notion that it is a better approach to overcome complications due to differential settlement. And, at the preliminary stage, with the worst-case scenario, any change thereafter is likely to bring down the cost rather than escalation.

@mte12,

If footing is already in place, how do you install piles?
 
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Hi, this is still in design stage.
So installation is future.
 
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Note that the elevation differential is a critical matter for both the longitudinal and transverse directions. A grout trough is a good way to accommodate the late/last-minute changes.
 
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Thanks for advising, I will consider this.
 
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