I do not have specs for the raised guy anchors I have installed over the years.
BUT my rule of thumb is 60/40 These were for towers in the 140 plus feet.
But started with 12 to 14 foot length of 12 in I beams ¼ web. A few were
sawn at a 45 degree angle and drilled for the jaw turnbuckles. Other used a
same piece of I beam gut down the middle web and drilled to bolt to the
flange face and then for the holes of the Jaw end of the turnbuckles.
As for the holes min was 6 foot depth perindicular to the tower and 4 foot
width. The bottom web was drilled 6 hole pattern to slide in the 1/2 inch
rebar .
As for concrete I fill the hole 50% and then back fill with tamped ground… I
am not in favor of the FULL hole fill. IMO it’s like a cork in a wine bottle,
wonce the friction of the walls in over come it POPS out ….. where the buried
DEAD man has allot of earth to over come /
My .02
Wayne W3EA
________________________________
From: TowerTalk <towertalk-bounces@contesting.com> on behalf of Fred Keen via
TowerTalk <towertalk@contesting.com>
Sent: Monday, March 19, 2018 5:53:45 PM
To: towertalk@contesting.com; Ed Sawyer
Subject: Re: [TowerTalk] Rohn raised guy mounts
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@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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