Here is a spreadsheet that calculates stress in a cantilever beam, i.e., your
elevated guy anchor. I include tables with many different sizes of standard
I-beams, pipe, square tubing, and angle. This was done for a major tower
upgrade at N6RO, 135 ft of Rohn 45G. We ended up with a 6x3 I-beam, elevated 5
ft and with 5 ft in the ground. I specified a robust foundation as well, with a
rebar cage derived from a tower base. The cage was surprisingly cheap, and
quickly fabricated by a local rebar shop. Our local steel supplier had a
variety of structural steel in their outdoor “excess" yard and charged us way
less than market price for a not-too-rusty beam that we then sent to the
galvanizer.
https://na6o.com/main/Amateur_Radio_files/Cantilever_beam_stress_calc.xlsx
73,
Gary NA6O
> From: Rick Harrington N0VT <N0VT@outlook.com>
> Subject: [TowerTalk] Pipe for guy anchor
>
>
> I have a small lot and my tower is 70' of 25G.? Due to some obstacles in
> the yard that can't be worked around I need to sink some metal pipe in
> concrete and attach the guys about 6 feet up instead of taking them down
> to the ground.? I realize this isn't the preferred situation.
>
> What type of pipe should I be looking for?
>
> Thanks, Rick N0VT
>
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