Sorry, the link given for info on elevated guy posts is available only by
going through all sorts of contortions. Here is the info that is at the end.
73, Dan, N5AR
Twr Ant Elevated Guy Post Anchor Data
Hght Load Type Size Len In GndOut GndCu.Yds. Size Deep
---- ---- ---- ---- ---- ---- ---- ---- ---- ----
Pipe 6" 10 4 6 4
HDBX I-beam 4" 11 4 7
T/O Pipe 4"x0.25 12 6 6 bell 7
60 Pipe 8"x0.375 10 3 7 0.11 1x1' 3
73 L I-beam 8" 5.5 3 2.5 1 3
75 Pipe 4" Sc40 10.5 4.5 6 0.17 1x1' 4.5
80 M Pipe 4" 6 3 3 0.09 1'dia 3
80 S I-beam 6" web 7.5 4 3.5 1.3
90 S Pipe 6" 8 3 5 0.75 3
90 I-beam 8 4 4 0.11 1'dia 4
93 S I-beam 4W-15 8 4 4 0.16 14"dia 4
100 L Pipe 6"x0.25 9 3 6 1 3.5
100 L I-beam 10W-24 11 6 5 2 3x3' 6
100 Pipe 5"x0.25 10 4 6 1 4
105 M Pipe 6" 8 3 5 0.75 3
120 L Pipe 4" 7 4 3
120 L Pipe 6" 12 6 6 2 3x3' 6
120 L Pipe 4"x0.25 7 4 3 1+ 4.5x? 4
130 I-beam 4" std 10 5 5 0.33 18" dia 5
130 I-beam 6" wide 10 5 5 1.5 5
130 Pipe 3"x0.25 8 5 3 0.06 8"dia 5
130 Pipe 5"x0.25 10 4 6 1 4
140 L I-beam 12" 9 5 4 3 4x4' 5
150 Pipe 7"x0.5 9+ 4 5 4.5 3.5x7 6
160 Pipe 8"x0.375 10 5 5 1.3 3' dia 5
192 Pipe 4" 13 3 10
HDBX is Rohn HDBX self-supporting tower
T/O is a Tilt over tower
Ant Load: S=small, M=medium, L=large
Most measurements in feet.
------------------------
From: W7XU Arliss <w7xu@dtgnet.com>
Reply-To: w7xu@dtgnet.com
To: Chad Kurszewski WE9V <Chad_Kurszewski@csg.mot.com>
Subject: Re: [TowerTalk] Elevated Guy Anchors
Hi,
The following information was from a talk K5IU (a mechanical
engineer and owner of Rotating Tower Systems) gave at (I
believe) the New Orleans DX convention a few years back:
For posts 7-8 ft above ground:
Installation Width and Ht. Length
Small 2 ft 5 ft
Med 3 9
Big 4 10
The above dimensions are for the concrete bunker. The
post sits in the middle of the bunker. The top of the
bunker is 1 ft below ground level. (Yes, that's right,
almost 6 yards of concrete per anchor for a large
installation).
Post size:
Round post, with guys attaching at 7-8 ft above ground
Installation Post diameter Wall thickness
Small 5" or larger 0.25" or more
Med 7" or larger 0.38" or more
Big 9" or larger 0.50" or more
Wide flange I-beams, with guys at 7-8 ft above ground
Installation Wide flange I-beam size, A36 steel
Small W 6x12 (6" X 4" - 12 lbs/ft)
Med W 8x15 (8" X 4" - 15 lbs/ft)
Big W 10x33 (10" X 8" - 33 lbs/ft)
What is a medium or big installation? I have a rotating
Rohn 25 tower approximately 135 ft high. It has eight
17-el 2 meter antennas on it, stacked one above the
other from 30 to 135 ft. The windload of each antenna
is 2.7 sq. ft., plus phasing lines, etc. That qualifies
as a medium size installation (per K5IU).
I have another rotating tower, 140 ft high. Rohn 55.
It's designed to hold a 10 ft dia. dish, a 6 ft. dia.
dish, a 4 ft dia. dish, 8 long boom (~22 ft) yagis on 432,
4 long boom (~28 ft) yagis on 222, and a couple of
vetical beams for 2m FM and 440 FM. That is a big
installation.
I have elevated guy posts for both of the above
towers, and followed K5IU's guidelines for the
concrete bunkers. I also did some reading on my
own and discussed it with a friend who is a civil
engineer -- it takes a lot of concrete and steel to
make proper elevated guys. A friend of mine skimped
when he put up what is probably a small system (a
tribander and 2m beam on 70 ft of Rohn 25) and now
his posts are pulled out of plumb.
Hope that gives you some ideas.
73, Arliss
W7XU
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