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Re: Embedded Pole

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Page 14 of the Metal Flagpole Manual published by NAAMM  (my edition 1980) has a page detailing a variety of embedded type poles, depending upon the height of the pole.   Essentially it is a tapered hole with a corrugated steel tube centered and back filled with concrete.  The pole is then set into the steel tube sleeve and tamped dry sand is placed full depth of the sleeve.   The pole has 4 steel centering wedges, welded to the base of the pole and then at the top, 4 hardwood wedges are installed.   There are other details.

The disclaimer is that this is used in "good, firm, dry soil only,....."

Neil Moore, SE, SECB
shingel springs, ca

At 06:53 AM 1/30/2007, you wrote:
It is not uncommon for a directly embedded pole (sign column, traffic signal pole, utility pole, etc.) to have a concrete "collar" cast around it.  This is typically done by setting the pole in the drilled hole and then backfilling with concrete.  The result is an increased width of the structure which increases the resistance to overturning.  Pretty standard stuff.
But how about if tamped gravel is used rather that concrete?  It stands to reason that the gravel should provide greater capacity than just the pole alone, but certainly less that the concrete collar.  Does anyone know of a reference addressing this?

David Finley
M. David Finley, P.E., P.A.
2086 SW Main Boulevard - Suite 111
Lake City, FL  32025