[TowerTalk] torque arms or not?

[Roger (K8RI) on TT]

The Farwell MI 2-meter repeater was on a commercial tower about the 
equivalent a city block distant from our house when we lived up there.  
I did the antenna maintenance. I had to climb around a guy bracket that 
was made of either 3/8ths, or 1/2 inch steel that completely enclosed 
the tower. Similar plates were used higher up. Guys were 1" and looked 
like wire rope. The tension? Hit one at the tower and it'd ring like a 
high pitched tuning fork well above middle C.

Whether u-bolted, or wrapped around a leg, using a single leg, weakens 
the tower at that point.  If engineering determines the tower load is 
insufficient to cause a problem, then it's fine, but I wonder what the 
insurance co would say if it failed?  Now days they have become very 
cost conscious and look for ways to invalidate coverage.

73,  Roger (K8RI)

On 1/12/2017 10:00 PM, john at kk9a.com wrote:
> The guy bracket on larger towers is u-bolted to the tower leg and bracing,
> it does not encircle the tower. It is not necessary to encircle the tower.
> My Rohn guy brackets look like this
> https://www.dxengineering.com/parts/roh-ga65gd
>
> John KK9A
>
>
> To:	towertalk at contesting.com
> Subject:	Re: [TowerTalk] torque arms or not?
> From:	"Roger (K8RI) on TT" <K8RI-on-TowerTalk at tm.net>
> Date:	Thu, 12 Jan 2017 18:16:30 -0500
>
>
> Although it's a common practice with hams, Guys should be attached to a
> bracket, not individual tower legs. It's not normally a problem, but guy
> brackets like ROHN sells puts no strain on an individual tower leg. On a
> heavily loaded tower,(near its wind load limit), when the guys are
> attached to individual tower legs, in high winds, the tower leg on the
> windward side takes the strain. With a guy bracket encircles the tower
> with the guy strain taken by the bracket and converted to a downward
> force, putting far less strain on the tower.
>
> You don't see commercial towers with the guy wrapped around a leg.
>
> 73, Roger (K8RI)
>
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-- 

73

Roger (K8RI)


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