I recently dug a number of holes to place 10' posts about 3 to 4 feet into
the ground for attaching a deer fence.
Some of the posts are leaning a bit with only the deer fence straining on
them--not even the deer running into them yet!
These were in freshly dug holes but with the refill hand-packed and no
Isn't "backyard engineering" a misnomer?
----- Original Message -----
From: "Lee Buller" <firstname.lastname@example.org>
To: "Alton J Drummond Jr" <email@example.com>; "TowerTalk Reflector"
Sent: Monday, January 09, 2006 10:21 AM
Subject: Re: [TowerTalk] Elevated Guys ??
> Take great care installing elevated guys. There are a lot of vector
> forces to account for and Dave is right...get an engineer to do the
> design. I did not do that thinking that 4 feet in concrete and 6 feet
> above ground would do. It did not! Do not use backyard engineering
> I used 10 foot steel 8" pipes that were schedule 80....filled with
> concrete. The pipes bend, but the earth moved. You need a massive amount
> of concret under elevated guys. I did not have enough concrete under
> mine. I need to dig them out and redo them, but then again that is a lot
> of work. You need to account for the "leverage" that is applied to the
> top of the elevated guy point and what it is doing through the fulcrum
> into the ground. The ground cannot move and the pipe should not bend.
> Most of the forces are along the line of the guy line...of course.
> If I were to do it again, I would triple the amount of concrete and make
> provision to weld on some braces that would be in the ground along the
> lines of the guy wires so when the energy is transmtted through the guy
> lines the braces would have to bare down from the fulcrum and the other
> would bare up. The braces would be in the ground....and in concrete.
> Think of burying a "T" upside down in the ground and the pouring concrete.
> The top of the "T" would be in line with the guys. That would give the
> elevated guy point something to push against in two directions...down
> thrust and up trust. Gobs of concrete too.
> I would also would have used "H" steel beams with an extra 1/2" plate
> steel welded between the verticle component of the "H".
> Dave is correct. Get a PE to do the work. Well worth the dollars.
> Lee - K0WA
> In our day and age it seems that Common Sense is in short supply. If you
> don't have any Common Sense - get some and use it. If you can't find any
> common sense, ask for help from somebody who has some common sense.
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