If it were my dilema, I would go back to the tower manufacturer and tell them
my situation. Ask for a modified and certified specification for the specific
instalation.
JIM
________________________________
From: Jim Lux <jimlux@earthlink.net>
To: towertalk@contesting.com
Sent: Friday, January 10, 2014 4:59 PM
Subject: Re: [TowerTalk] Base equivalent
On 1/10/14 1:28 PM, Mike Reublin NF4L wrote:
> The specs for my crank up call for a hole 4x4x7.5 feet. That works out to 4.4
> yds of concrete. The smaller backhoes that I can get to the site can go to a
> depth of 6 feet. Because of the water table, I consider it an unacceptable
> risk to put a man in the hole to dig out to 7.5 feet deep.
>
> A hole 5x5x6 is 5.5 yds.
>
> Would that be a safe equivalent to hold the tower up with the same wind load?
>
I just thought of a better analogy than my straw in a milkshake one..
For a freestanding tower, the base is more about resisting movement, not
so much bulk and mass.
Compare a tootsie-pop and a long thin peppermint stick, each shoved
half-way into some stiff pudding or cake. The tootsie-pop is heavier,
but it's round and there's not much resistance to tipping the stick
over. The peppermint stick might be the same weight (in the "soil"),
but is harder to push over.
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