On Fri, May 2, 2014 at 10:38 AM, K7LXC--- via TowerTalk
<towertalk@contesting.com> wrote:
>> The engineer didn't want to do a formal analysis, and there is no
> permit involved. Undisturbed soil is what I'd heard, but the HyGain book
> doesn't
> mention it. I have no idea how old it is.
>
> Since way back then (70's? 80's?), the TIA-222 has been written and
> revised several times. It is the industry standard for tower installations.
TIA-222 has very little to say about the tower foundations except to
say that a geotechnical report is required and frost depth is
required. It is a standard used to calculate the loading conditions
on the tower structure itself, it has nothing to do with the soil
engineering.
>
>> Still in Duval, so care is certainly advised. What that means in terms
> of real life shovel-in-the-ground practice, I'm unsure.
>
> Sounds like your engineer wasn't real helpful. If you're going to do
> it all yourself, contact a local excavator and ask their advice, especially
> for your sandy environment. In this case over-engineering mostly means a
> bigger base since you don't have any control of what's above it. There is a
> chance that a tower with a base in sand will start to lean away from the
> prevalent wind direction over time, being pushed by the wind. A bigger base
> will minimize this. A single guy to the top of the bottom section in the
> direction of the prevailing wind will help too.
>
> Cheers & GL,
> Steve K7LXC
> TOWER TECH -
> Professional tower services for amateurs
>
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