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RE: Strengthening soils under existing footing?

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Check out both Resistance and Helical steel piles.  With resistance piers, a
machine anchors to the new footing and hydraulically pushed a steel pipe in
the ground in short sections, with each section is connected to the previous
one.  This would require a decent amount of existing dead load to work in
this application.  They?re typically used to repair foundation settling

Helical piers are similar, but with round plates that are slit and twisted
to form screw threads. is one place for information, but I?m sure there are

Jason Kilgore
Leigh & O'Kane, LLC
Kansas City, Missouri
From: Jim Wilson [mailto:wilsonengineers(--nospam--at)] 
Sent: Thursday, July 29, 2004 1:31 PM
To: seaint(--nospam--at)
Subject: Strengthening soils under existing footing?

Has anyone considered a way to strengthen the soils under an existing
footing without disturbing much of the surrounding?  I am envisioning
pressure grouting through a 30" x 30" footing to the soil below to
effectively increase the bearing area.  Hmm...
The original design drawings ca. 1975 state a 4000psf soil capacity.  The
owner wants to add a penthouse/roof structure, but the soil bearing pressure
is limiting the ability to do so.  Its hardly practical to widen the
footings and add new columns centered on the new improved/footing.
Is grouting effective in this case, and is it even cost effective?  Any
Thanks in advance,
Jim Wilson, PE
Stroudsburg, PA
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