[TowerTalk] Rohn raised guy mounts

[Grant Saviers]

Based on a PE plan I had done (but decided to use the standard Rohn guy 
anchor design) it takes a lot of in ground depth of the post or concrete 
mass like KC5YN used to withstand the moment of a post with 8' of 
clearance.  My 7' clearance 8" sch 40 pipe post holes were to be 4' 
square by 7.5' deep for a much bigger tower. I have seen posts not set 
deep enough that were leaning get saved with a back guy to a concrete 
deadman, but that kinda defeats the whole idea.  IMO this is PE 
territory to get a stable design both for the needed soil resistance and 
the beam strength & deflection.  The guy pretension is present 24x365 
also, so freezing and ground water influences could be significant.

Grant KZ1W

On 3/19/2018 14:53 PM, Fred Keen via TowerTalk wrote:
> We installed raised guy posts similar to Eds. I bought 8" wide flange beams (I beams) 12' long and had 3/4" rods 36" long welded to the front and rear (three each side) of the flat faces of the beams about 8" apart on the lower 3 feet of the beam. We then set the bottom 4' of the beam into a 4' x 4' x 4' hole and and filled with concrete.
> This allows me to mow with approximately 8' height clearance around the base.
> The tower is 70' Rohn 45, with guy connections at 33' and 66'. The top 20' of the guys are phillystran.It supports a Force 6BA 40-10meter yagi, 80 meter rotatable dipole and 6meter yagi.
> Note, you should take into account the guy spacing as shown in the book going to the ground will be different for the top and middle guys. I would use the dimensions for the top guys. This you can do with a scaled graph chart.
>
> Good luck with your venture.
> Fred KC5YN
>
>
>
>
>   
>
>      On Monday, March 19, 2018, 12:17:08 PM CDT, Ed Sawyer<sawyered at earthlink.net>  wrote:
>   
>   The ones I have seen were home made.  12 or so ft of building construction
> grade steel I beam with a few guy attach holes drilled near the top of one
> end and a couple of holes for some steel rods to be passed through on the
> bottom end.  The lower 4 ft or so is buried in concrete with the steel rods
> going through at right angles to the I beam.
>
>   
>
> Ed  N1UR
>
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