[TowerTalk] Square Hole or Round Hole for Self Supporter?

[Dick's]

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 at 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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