Thanks to all for the quick answers. Found the info in the back of my Rohn
catalog -- silly me for not looking. Guess I thought all the info needed
would be grouped with each product. Anyway, the drawings should be
sufficient to satisfy the zoning administrator's request.
Also thanks to those who warned me about getting professional engineering
advice for elevated anchors. This may be more complicated than I had
thought, and may not be worth the trouble (the tower is in a field that gets
no traffic and is mowed only once a year.) I was mainly hoping to reduce the
guy radius a bit so foliage would screen the guys from the house better.
I have more questions I'll put in separate posts.
73, Dick WC1M
> -----Original Message-----
> From: Joe Subich, W4TV [mailto:firstname.lastname@example.org]
> Sent: Thursday, November 17, 2005 3:08 PM
> To: email@example.com
> Subject: RE: [TowerTalk] Rohn 45G/55G foundation dimensions
> My 1993 Commercial Products Catalog answers most of these questions
> > 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.
> Pier pin base: Drawing C641210R7
> 2'6" x 2'6" x 4.0' with 6" above grade
> Rebar: 4 x #6 vertical (corners)
> #3 ties every 12" on center
> Guy anchors: Drawing C620643R13
> Anchor block: 4A -- 3' x 3' x 1.5' bottom is 4' below grade
> Rebar: 1/2" diameter both faces (top/front)
> 12" centers both ways.
> > 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?
> > - 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?
> All answered above.
> > - 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?
> > - Is there a source of drawings for these footings?
> Catalog provides no information on elevated guy anchors.
> Best minds have suggested that elevated anchors should be
> designed based on local conditions.
> ... Joe Subich, W4TV
> microHAM America, LLC.
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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