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Allowable foundation settlement - portal crane
3

Allowable foundation settlement - portal crane

Allowable foundation settlement - portal crane

(OP)
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.

RE: Allowable foundation settlement - portal crane

if if there was a specification I would still go to the manufacturer and have them confirm.

RE: Allowable foundation settlement - portal crane

(OP)
Thanks.
We don't have a manufacturer yet. This is still early stages.

RE: Allowable foundation settlement - portal crane

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.

RE: Allowable foundation settlement - portal crane

(OP)
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.

RE: Allowable foundation settlement - portal crane

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.

RE: Allowable foundation settlement - portal crane

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.

RE: Allowable foundation settlement - portal crane

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.

----
just call me Lo.

RE: Allowable foundation settlement - portal crane

(OP)
Thanks for the responses.
The attached document from Retrograde is quite useful.

RE: Allowable foundation settlement - portal crane

Quote (OP)

There is a strip footing along each track. I'm not sure if piling is normally required.

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?

RE: Allowable foundation settlement - portal crane

(OP)
Hi, this is still in design stage.
So installation is future.

RE: Allowable foundation settlement - portal crane

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.

RE: Allowable foundation settlement - portal crane

(OP)
Thanks for advising, I will consider this.

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