K9KL did not specify if he is going to guy this tower or not. This makes a
huge difference regarding using the existing base. I also do not know how
he intends to get 28' in height using Rohn sections.
John
To:towertalk@contesting.com, k9kl@centurytel.net
Subject:Re: [TowerTalk] Rohn 45
From:K7LXC@aol.com
Date:Wed, 25 Dec 2013 17:40:10 -0500 (EST)
> I want to remove a Rohn 25 that I have buried in the cement. I want to
reuse the concrete base and attach Rohn 45 in its place. I want to install
about 28 feet of Rohn 45 with a small 6 meter array,4 antenna but only 5
elements each. The antenna box will be about 24 feet by 24 feet. There
will
be about 18 square feet of wind load on the tower. Is this possible?
Should I did out the base and plant the 45 in the hole and re-cement? Can
holes
be drilled down into the concrete and a base plate used for 45 be attached
using bolts and some type of epoxy?
I wouldn't recommend removing and re-installing the base - too much
danged work plus the base should go into undisturbed earth per previous
concrete comments. While a base for 25 or 45 isn't really asked to do much
(it
basically keeps the tower from sinking into the ground), for the relatively
little work to dig and pour the new concrete I'd opt for a new hole and
concrete.
OTOH feel free to use the existing base for the new 45 base. If you
don't have any rebar in the existing base, you just need a rotary hammer to
drill the new holes. If you run into some rebar, you'll need a diamond
coring bit.
The place where you rent the rotary hammer will probably have the
construction epoxy you'll need to anchor the new bolts. It's 2-part epoxy
and
you can get it at any hardware store. The cured epoxy is stronger than the
concrete so when it's hard, you're good to go!
Cheers & GL,
Steve K7LXC
TOWER TECH
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