If the PE is recommending that you go 5 times!! deeper than the
manufacturers specs, I would want to review his calculations
to see why he is wanting to go so deep. As Jim says, it certainly
sounds like a very strong installation, but it also sounds like
bocque overkill for a ham tower (David, have you received a
cost estimate on the augering yet).
BTW, here's on for all of the PE/civil engineer's out there.
How does one calculate the max overturning force that a
cylindrical reinforced concrete column can take? Do you
assume a homogenous material with a yield strength of 3
to 5 Kpsi, or is it more complicated than that (e.g. does
tensile/compressive strength of the rebar come into play)?
73 de Mike, W4EF............................................
----- Original Message -----
From: "Jim Lux" <jimlux@earthlink.net>
To: "Jerry Keller" <k3bz@arrl.net>; "David Giuliani" <David@Giuliani.org>;
<towertalk@contesting.com>
Sent: Sunday, October 05, 2003 11:18 AM
Subject: Re: [TowerTalk] The tower base is poured BUT...
> Sure, there are truck mounted augers that can bore a lot deeper than
25'...
> The cave in issue is mostly for the upper layers of soil. Once you get
down
> very deep, the soil tends to be more like "soft rock" and is fine for
> drilling... The other thing to think about is that the auger operator has
> drilled hundreds of holes and are well aware of what's feasible and
what's
> not in a given area, and what the specific techniques needed are.
>
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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