The design drawings call for a rectangular hole with a rectangular rebar cage.
An 87” dia hole will be a LOT larger and greatly increase your volume of
expensive concrete. I just finished my tower foundation with a back hoe that is
very similar to your project. One can make a fairly decent hole with a backhoe
and a helper to help guide the operator. Also, what are you going to do at the
top; have a round or rectangular edge?
Finally, if you are going to have to pull a permit and not do it according to
the engineering drawings, you might have a tough time with a county/city
inspector who won’t understand why you deviated from the instructions.
Feel free to check out project I finished in our monthly newsletters starting
with Aug 2017 at:
http://n4lnr.org/newsletters/
Dick, K0CAT
———
> On Jan 20, 2018, at 2:01 PM, Richard Thorne <rthorne@rthorne.net> wrote:
>
> I have an HDX-589. I'm in the planning stages for getting the tower
> installed.
>
> I ran across a driller yesterday that can drill the 10' deep hole to a
> diameter of 7' (87" to be exact).
>
> We have excellent soil here for self supporting towers, caliche. Digging by
> hand is out and using a back hoe would probably make an over size hole.
>
> Is there a reason not to use a cylinder vs a square hole?
>
> Rich - N5ZC
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