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
************************************** See what's free at http://www.aol.com.
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