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Residential Pile Foundation Settlement - Advice Please 3

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RRJim

Civil/Environmental
Joined
Jan 4, 2004
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Location
US
Subject house is on a Bay subject to tidal fluctuation. First Floor elev. is about 2-3 feet above MHW. Foundation is wood piles, garage slab seems to have a support wall that has failed, causing the non-bearing wall above to settle about 2 inches to date. May have been damage from a 1985 hurricane or any number or nor-easter type storms that have affected the site. I need to jack the wall back up to original position and attempt to support the garage slab, working in an extremely tight environment. Does anyone out there have any experience in these types of situations?
 
If bored concrete micropiles are feasible (mainly on the concern of if they are reliably filled with injected non washed concrete) then they are a good candidate since the equipment uses to be small and apt even for interiors.

However, if not, you may think on bridging under the settling floor-wall with a longspan deep member, temporary or not, in order to work for foundations outside the plan.
 
Consider using helical screw piles. Check out the web site for A. B. Chance Company for their Chance Anchors. These should be much cheaper than micropiles unless you have underground obstructions which would make it difficult to install the screw piles.
 
Your first order of business ought to be a study to figure out what caused the wall failure. This should be done before you try to repair anything.

Helical anchors work well in some circumstances, but they don't do well with long unbraced lengths. They don't have much flexural stiffness -

[pacman]

Please see FAQ731-376 for great suggestions on how to make the best use of Eng-Tips Fora.
 
Like I said, check out the A. B. Chance web site. They have helical screw piers with different shafts of different stiffnesses, such as 1.5" & 1.75" square rods and 3.5", 8" and 10" diameter pipe. These should provide sufficient stiffness for the short unbraced lengths expected with a wood-framed garage/work shop.

 
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