My GUESS would be that 4" galvanized pipe would work. I would sink it
about four feet in a base about 3 x 3 x 1.5 feet of concrete. That would be
in a hole 3 x 3 x 4 so you would only fill the hole up 18 inches with
concrete and back fill the rest with the dirt from the hole. if it was in my
backyard, I would sleep well at night with the set up. You might be able to
get by with less, but do you really want to try. Towers make a big boom
when they come down.
The three anchor bases would need a total of 1.5 yards and your base for
the Rohn 25 will need another yard or so. If your concrete company has a 5
yard minimum (many do) simply pour the rest into the three anchor holes.
They will never go anywhere...for sure.
As an extra you might want to dump concrete down the pipe...stops the pipe
from filling with water and adds some strength. If you do I would order
the mud with small agregate for easier pouring.
Bill KH7XS/K4XS
In a message dated 10/29/2011 4:09:54 P.M. Greenwich Standard Time,
yvadir@gmail.com writes:
I live on a small city lot and am in the process of installing a 40 ft
Rohn 25G tower in my back yard with a pier pin base. I'd really like to
avoid using screw in anchors in such close quarters and would prefer to
use an elevated guy anchor like pipe set in cement. I originally thought
that 11 ft would be great to clear my roof line but have been told that
would require a pipe larger than what I can obtain around here. Revising
my plans a 4 ft high pipe in the corners of the back yard would still be
better than going to ground level. Can anyone give me an approximate
idea as to what size pipe and what size base might be needed?
My tower is 40 ft, I would have at most 12 lbs of wind load on it, my
soil is a pretty heavy clay with no sand and no rock at least down to 4
ft., our wind zone is said to be 70 MPH. Any input would be greatly
appreciated.
73
Richard / N5YPJ
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