Wow! I'm with you on that one... I was simply showing that Rohn
requires 2 brackets to use the data on their table... And there's a 0.6
derate if not all the elements are round!
Sounds like someone did not know how to properly source, use, torque
fasteners.... Personally, I would use a torque wrench and safety wires
on every section fastener is I were going to use butt joinery in a metal
tower like Rohn. It's more expensive, but so is my house, my family,
and me.
73,
Clay
On 10/24/2017 6:59 AM, N1BUG wrote:
I am far from an expert but every bracketed Rohn 25G tower I have
climbed (several) wobbled in the joints above the top bracket. The one
that I took down showed major elongation of holes in the joint that
was above the top bracket.
I once installed a guyed 25G tower with guys near the top of the next
to last section. It only had a large VHF vertical on top but was in a
very windy location. After two years the bolt holes at the one joint
above the guys were worn so much I had to replace the top two sections.
I know Rohn gave the OK to bracketed installations for many years
(maybe still does) but personally I will never again put even one
section joint above the uppermost bracket or guys.
Paul
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