[TowerTalk] Rohn 45G/55G foundation dimensions

David Hachadorian k6ll at adelphia.net
Thu Nov 17 14:55:56 EST 2005

----- Original Message ----- 
From: "Dick Green" <dickgreen at verizon.net>
To: "Tower" <towertalk at contesting.com>; "YCCC" <yccc at yccc.org>
Sent: Thursday, November 17, 2005 6:38 PM
Subject: [TowerTalk] Rohn 45G/55G foundation dimensions

> Hi. I'm putting together specs for a tower installation that will 
> consist of
> 100' of Rohn 45G or 55G (or equivalent) with pier pin base. The 
> local zoning
> administrator would like some detail on the concrete footings for 
> the tower
> and guy anchors. The Rohn catalog only shows specs for an embedded 
> base
> foundation and doesn't show any detail on reinforcement. No 
> dimensions,
> other than the rod angle, are shown for guy anchor footings.
> Questions:
> - What hole depth and concrete dimensions are required for a Rohn 
> 45G or 55G
> pier-pin base?
> - What are the specs for the rebar cage?

In my 1996 catalog, these are shown on Rohn Dwg C610621

> - What hole depth and concrete dimensions are required for standard 
> guy rod
> anchor footings?
> - Is rebar required for an anchor rod footing, or does the rod 
> provide
> enough reinforcement?

These are on Rohn Dwg C620643

> - If I decide to use I-beam posts to elevate the guys, what hole 
> depth and
> concrete dimensions do I need?
> - Is rebar required to reinforce an I-beam post or will the post 
> provide
> sufficient reinforcement?
> - What's the max height of the I-beam above ground?

Not much is available from Rohn on this subject, although the catalog 
has a murky photo of a 10' I-Beam, showing a 45 degree diagonal cut at 
the top, with each guy level going through its own separate hole. 
Check the towertalk archives on "elevated guys." There has been a lot 
of previous discussion. Serious buried depth, heavy metal, and lots of 
concrete are in order for elevated guys. An engineered solution is 
preferred. Serious overkill is a possible alternative. Either way, 
it's rather expensive.

Dave Hachadorian, K6LL
Yuma, AZ 

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