[TowerTalk] Pipe for guy anchor

[gwj at me.com]

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 at 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
>