Thanks Tommy,
The commercial "foundation" company crew brought a 30" auger, drilled the 4'
hole in less than 5 minutes, set a sonotube, dropped the spec'd rebar cage
in, c/lined the pier pin and I OMG set the base plate over and discovered
the fubar. Plan "B" is to now have them set a rectangular 36" square
(inside) 2'X6" form on grade centered around the 30" existing hole...they
will cut the 6" above grade sonotube down to grade level first and add
appropriate wire mesh or rebar in that 36" square form. Crossing my fingers
and knocking on wood....
73, Mike
_____
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of Tommy Alderman
Sent: Wednesday, November 03, 2010 4:48 PM
To: 'Tower and HF antenna construction topics.'
Subject: Re: [TowerTalk] Rohn 45 tower and base
No - you are exactly correct!
I did not follow the Rohn instructions and used the CB2 foundation. My pier
pin base plate is offset as you say, but with the larger 36" x 36" CB2
foundation, the base plate does not overhang. My tower is only 70' high, but
with a 90' 45G, I sure would phone Rohn and get confirmation that their
Buyers Guide is correct, just for the peace of mind!
Tom - W4BQF
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of MIKE
Sent: Wednesday, November 03, 2010 2:33 PM
To: towertalk@contesting.com
Subject: [TowerTalk] Rohn 45 tower and base
I am trying to get a 90ft 45G tower installed before winter sets in and the
required base in the mfg guide is a CB1, 30" round or square (more
concrete). Found out the hard way that the steel base plate hangs off the
30"circular pier on two sides. Digging into an older Rohn catalog, I found
in the fine print that I require a 36" circular pier! Aside from this all
the drawings I've found specs the pier pin to be "centered" whether or not
you use a round or square form.
The 20"X24" concrete base plate pier pin hole is offset and the plate (and
tower) will not be centered over the c/l of the foundation. Am I missing
something here?
Thanks, Mike K4EAR
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