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Re: Concrete Poles

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Mike,

In my area (Florida)  the highmast lighting you see on the interstate is
typically steel poles with a drilled shaft foundation.  Street light poles
are normally aluminum poles mounted either on precast shafts or on screw
anchors.  Strainpoles are typically concrete embedded into the ground with a
concrete foundation cast around them.  The latter is similar to your
condition.

Casting concrete around the base of the concrete pole essentially gives you
a larger surface for accomodating the loads.  A four foot diameter hole can
be drilled rather easily.  As far as the depth, I would use Broms's method
to determine how deep the pole needs to be set.  Of course, the electrical
contractor - who does not need to sign and seal the design - will claim you
are being overly conservative.

I don't see how you could connect the concrete pole to a spread foundation.

David Finley, P.E.



-----Original Message-----
From: Michael D Zaitz <mzaitz(--nospam--at)surfsouth.com>
To: seaint(--nospam--at)seaint.org <seaint(--nospam--at)seaint.org>
Date: Monday, February 15, 1999 3:50 PM
Subject: Concrete Poles


>Hello,
>
>A cleint has a concrete pole that is 35 feet above ground.  The pole will
>support some speakers to be used for an emergency broadcast system and
>will be designed for 110 mph winds.  We have the option of using a spread
>footing or encasing the pole in a caisson.  What is typically done for
>lightpoles that you see by the highway?  The electrical contractor
>recommended that we drill a 5 or 6 feet deep hole, stick the pole in it
>and fill it with concrete.  Any comments?
>
>Mike Zaitz
>
>
>
>