[TowerTalk] Info on elevated guy points

[Dan Hearn]

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 at dtgnet.com>
Reply-To: w7xu at dtgnet.com
To: Chad Kurszewski WE9V <Chad_Kurszewski at 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