The current Rohn 25G/45G brochures actually show round bases but the
notes allow for a square base. The GSR (solid rod rails) brochure shows
a square base with a tower piece embedded in the concrete base. The older
25G/45G data had square base recommendations. I suspect it does not make
much difference. The square hole will take more concrete and would be easier
to dig with a backhoe. If you had access to big posthole digger then the
hole is probably easier a bit less concrete.
73, Larry W6NWS
----- Original Message -----
From: "Richard Thorne" <email@example.com>
To: "Towertalk" <firstname.lastname@example.org>
Sent: Wednesday, October 26, 2011 1:28 PM
Subject: [TowerTalk] Tower Base Round or Square?
> I'm finally getting some dirt work done in the next day or two at my new
> place which will include holes/concrete for my 45g tower.
> I plan on using a pier pin install, so does it matter if the base is
> square or round? The rohn book calls for a 2' 6" square hole 4' deep
> (I'm designing the tower based on 90mhp winds with a height of 120').
> It would be easier to use a 36" auger to dig the hole. Since I'm going
> with a pier pin I don't see that there would be any twisting moments on
> the concrete base, it would only be there to hold the tower up. But I'm
> not an engineer, hence the question.
> Rich - N5ZC
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