why reduce pile capacity in existimg piles
why reduce pile capacity in existimg piles
(OP)
I have a scheme where we are installing new pile close to existing, it has been suggested to me I should be reducing the capacity of the existing. Why? If we are far enough away and block failure of the pile group is not critical why does it matter? Why is that any different to them being installed at the same time. The existing is actually less capacity than the new piles.?
I see no logic. Maybe if the old were greater capacity keep the load down to the new, I can almost understand the logic. but not this. Any ideas?
I see no logic. Maybe if the old were greater capacity keep the load down to the new, I can almost understand the logic. but not this. Any ideas?






RE: why reduce pile capacity in existimg piles
If they do, consider that over time the (loaded) old pile have either settled in the soil or foreshortened due to compression within the pile itself - not much, maybe a few hundreds of an inch, but they have settled / foreshortened. No matter what specs are used for the new piling, when they are loaded, they will settle / foreshorten (a little bit) also.
However, when the new common pile cap is constructed the new pile settlement has NOT yet happened. When this settlement does happen the load on the new piles will tend to go lower (as the piles go down in elevation) and the load on the old piles will tend to go higher (since they will not go down in elevation as much or any at all).
By arbitrarily saying that the old piling will be more lightly loaded (for the new design), you are taking into consideration that (in the field) the loads on the old pile will slowly increase as time goes by (hopefully not to exceed their ORIGINAL design capacity).
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RE: why reduce pile capacity in existimg piles
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: why reduce pile capacity in existimg piles
This is how a newly installed system behaves.
RE: why reduce pile capacity in existimg piles
BA
RE: why reduce pile capacity in existimg piles
RE: why reduce pile capacity in existimg piles
However you calculate pile load, I see no reason to reduce the capacity of existing piles.
BA