In a message dated 4/25/2007 8:25:21 A.M. Pacific Daylight Time,
towertalk-request@contesting.com writes:
> here is what i have and what i am wanting to do,
> as it "stands" now i have a rohn 20 tower at 40ft when i installed this
tower about 10 years ago i didnt use a base plate so she is in 3x3x4 or
close to that, in concrete since then i have become a ham and noticed the
need for more tower work, what i am wondering is unstack the one cut it
flush with the concrete make a hinge plate and bold it down to the existing
concrete using heavy duty lag bolts? will this hold? we do not have alot of
wind or ice here. i do not have this one guided off no room for it so
getting down to it will it hold with out guy wires at a hight of 40ft,
bolted down with lag bolts that i will have to drill into the existing
concrete?
If you're in Prentiss County, it's a 70 MPH windspeed zone. Freestanding
25G is rated 1.5 square feet at that windspeed. Rohn specs call for a base
size of 4x4x4 using 2.4 cubic yards of concrete so your base is a little
undersized. Fatally? Probably not.
So your plan is to take it all down, put in a hinged base and then
reassemble everything? Personally I'd be more comfortable having a section in
concrete instead of the hinged base so I'd leave it the way it is. Lots less
work
too.
You can drill the concrete and put in anchor bolts with epoxy and it'll
hold just fine if that's the way you want to go.
Cheers,
Steve K7LXC
TOWER TECH -
Professional tower services for hams
Cell: 206-890-4188
************************************** See what's free at http://www.aol.com.
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