JUST THINK ABOUT WHEN U NEED TO MOW THE LAWN AROUND THE TOWER!!
its easy to cut around a square form "but" a round one not so easy. my
2 bob's worth DE VK3PA
Quoting "Joe Subich, W4TV" <lists@subich.com>:
>
> I asked the same question of a well known Professional Engineer a
> couple of years ago. His answer was quite simple and made a lot
> of sense ... the round base can be used instead of a square one
> if the diameter of the round base is the same as the *diagonal*
> measurement of the square base.
>
> In your case, for a 2' 6" (30") square base the round equivalent
> would be 42" diameter *not* 36" as you propose. The reason has to
> due with projected surface area - the area that resists overturning
> - not volume (or weight) of the concrete.
>
> 73,
>
> ... Joe, W4TV
>
>
> On 10/26/2011 1:28 PM, Richard Thorne wrote:
>> 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.
>>
>> Thanks
>>
>> Rich - N5ZC
>>
>>
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