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Re: Foundation Underpinning

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Jason,

	Find some contractors who specialize in this type of work and ask them
how to do it.  Geotechnical information will certainly be required; your
geotech. will probably have some contractor names AND some ideas of how
to do it.

	Good luck.

				Regards,

				H. Daryl Richardson

Jason Kilgore wrote:
> 
> I have a job where the architect wants to add a lower level to a structure,
> and he wants the lower area to be the same as the upper area.
> 
> At the exterior wall, I think this is possible.  Excavate both sides of the
> wall, then when you get to the foundation, install a needle-beam/column
> system to "unload" the wall (a column or drilled pier on each side of the
> wall with a beam punched through).  Continue excavating under the footing,
> pour a new footing and wall, then you're done.
> 
> Unfortunately, in several locations, there is no access on the opposite side
> of the wall from the new lower level (one locations has a very crowded
> mechanical room opposite).  I can't think of a way to excavate directly
> under the existing footing.
> 
> These interior walls are fairly lightly loaded (mostly the weight from tall
> interior CMU walls, but no "structure" weight or live load).  The largest
> excavation is 7'-0" from bottom of existing footing to finished floor.
> 
> One solution I have proposed to the architect is by Atlas systems, Inc.  It
> uses a combination of steel resistance piers and helical soil-nails to
> underpin an existing foundation, but the lower wall is offset the width of
> the wall + 4" (16" offset for a 12" wall).  He wasn't happy about loosing
> 16", and in one location he really can't loose 16".
> 
> Does anyone out there have any suggestions?
> 
> ----
> Jason W. Kilgore, P.E.
> Leigh & O'Kane, L.L.C.
> jkilgore(--nospam--at)leok.com
> (816) 444-3144
> 
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