George - sounds like we have a similar
"problem". I did exactly what Steve recommended
and it works fine. I sleep well at night. You
can see how I did it on my web site:
http://home.centurytel.net/WD0M/
Click on Ham Radio, then Tower Project. It's
been up for almost 4 years....not a problem even
in 88 mph wind gusts that blew out the windows on the front of my home.
Let me know if you have questions...
73,
Joe
WDØM
Pagosa Springs, CO
At 11:11 AM 4/7/2007, K7LXC@aol.com wrote:
>
>In a message dated 4/6/2007 3:24:30 P.M. Pacific Daylight Time,
>towertalk-request@contesting.com writes:
>
> > Folks, I have a 60ft (6 x 10ft section) tower, like the Universal 18"
>pattern. I intend on a 36"x36"x36" concrete (C20) footing set into near
>solid rock ground. Any ideas or documents on concrete footings and design of
>rebar, heat cracking problems of pouring such a cubic amount of concrete in
>one go? Additives? I want to get this up ASAP due to certain planning
>requirements so don't have much time to get a engineer out to have a look so
>am happy to over engineer the thing. I can supply accurate dimensions of the
>tower if needed.
>
> My first question is why aren't you using the free solid rock that's
>just sitting there? You're proposing taking out
>the rock - a LOT of work - and
>then replacing it with concrete. Why bother? Use a rock drill to drill your
>anchor bolt holes and then epoxy the anchor
>bolts into the rock. Put concrete
>on the top of the rock to 4-6" above grade to
>get water to run off and you'll
>be good to go. Sounds simple and cheap to me.
>
>Cheers,
>Steve K7LXC
>TOWER TECH -
>Professional tower services for hams
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