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Re: [TowerTalk] torque arms or not?

To: towertalk <towertalk@contesting.com>
Subject: Re: [TowerTalk] torque arms or not?
From: Steve Maki <lists@oakcom.org>
Date: Sun, 15 Jan 2017 00:10:01 -0500
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
I think you're over-generalizing this topic.

On larger commercial towers, one ALMOST never sees guy brackets encircling the tower (except for the guy levels requiring a 6-way star guy). The normal attachment is via a heavy tab welded directly to a leg. The tabs are generally located at horizontal braces, so that the guy forces ARE distributed to all three legs. Rest assured that the towers are engineered properly.

-Steve K8LX

On 1/14/2017 21:15 PM, Roger (K8RI) on TT wrote:

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.

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

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