[TowerTalk] Guy Anchor Pullout Strength

[T A RUSSELL]

On Thu, 02 Jul 98 19:22:31 PDT "Ron Youvan" <ka4inm@gte.net> writes:
>
>T A RUSSELL said:
>snip
>I don't believe a few inches of pullout will allow a tower to fall.
>
>W1EVT told me he decided to install insulators in one
>of his 140 ft Rohn 25 towers to make a 160M elevated GP.
>They had to loosen the upper guys to where they were
>almost hanging along the tower before they could jack it up.
>
>de  N4KG
>snip
>
>  Did he slack ONE cable until there was little or no tension, then 
>move tho the next one?
>
	My understanding was they slackened them equally
	at each level.   N4KG

>If one cable loosens and the other two are maintaining tension, they 
>will TRY to pull the tower over.

	YES, but NOT to the point of failure.  I had 2 trees fall
	on one of my guys after a tornado.  The top of the 130
	ft tower was arched over 1 ft, but the tower did NOT fail.
	Once the trees were removed, the tower straightened 
	right up.  I had to retighten the guys.  I assumed they 
	stretched.    N4KG

>If ONE (or two) legs "KINK" she* will come down.

	Not likely.  As in the above case, they are more likely to
	arch.     N4KG
>
>With out any wind, a tower will stand with NO guy cables, without any 
>problems. (assuming it is plum)
>Guy cables add loading to the tower, they pull down on the tower, 
>pretty much their weight + the tension.
>
	Understand.  Agree.

>The higher the tension the greater the chance of tower failure.
>There is a correct tension, any MORE IS BAD!
>
	A few inches stretch in one guy point is not
	likely to put a permanent bend in the tower.
	Tower is a lot more  flexible than you imagine.
	N4KG

>* anything with speed, beauty, style or grace is often refered to in 
>the feminen gender!
>
>      73  de Ron ka4inm@qsl.net    Best Regards

_____________________________________________________________________
You don't need to buy Internet access to use free Internet e-mail.
Get completely free e-mail from Juno at http://www.juno.com
Or call Juno at (800) 654-JUNO [654-5866]

--
FAQ on WWW:               http://www.contesting.com/towertalkfaq.html
Submissions:              towertalk@contesting.com
Administrative requests:  towertalk-REQUEST@contesting.com
Problems:                 owner-towertalk@contesting.com
Search:                   http://www.contesting.com/km9p/search.htm