Why not cut off the existing Rohn 25 and use a pier pin base for the new Rohn
45? it would only require drilling one hole in the center and epoxying one
bolt...pretty easy.
Chris
KF7P
On Dec 25, 2013, at 15:40 , K7LXC@aol.com wrote:
> 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
PS - What's a 24'x24' antenna box?
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