[TowerTalk] Self Supporting Tower Install

[Grant Saviers]

  With a big enough base footprint and mass and the foundation can sit 
above grade and meet the needed moment resistance.  However, these 
dimensions seem like the "stock" plans that require undisturbed soil 
around the concrete base.  Or backfill and compact around the form with 
a rated fill, but when I looked into that for a way oversize hole 
created by encountering 2 ! abandoned septic tanks, it was cheaper to 
pour more concrete which counted as "undisturbed" soil.

Grant KZ1W

On 5/14/2017 6:02 AM, Jon Pearl - W4ABC wrote:
> I hope there's nothing sitting in the fall zone, Mike.
>
>
>
> 73,
>
>
> Jon Pearl - W4ABC
>
>
> On 5/11/2017 7:42 PM, Mike Ryan wrote:
>>            Over the weekend I was shown some pictures of a method 
>> being used
>> by some locals here to plant a new 50ft self supporting tower. Not 
>> sure of
>> the WIDTH of the hole but I am pretty sure it was 5ft wide.  (As I 
>> recall it
>> was going to be 5 x 5 x 5).  What I was surprised at in particular 
>> was their
>> use of a section of plastic corrugated pipe (PVC) which was to line the
>> hole.  I guess it is designed as a cylinder of some type to hold the
>> concrete. I've done a few towers myself and would not ever have 
>> dreamed of
>> such a scheme but I was told they got their 'idea' from a ROHN catalog.
>> ....I've never seen THIS in a ROHN catalog.  The fill in around the 
>> cylinder
>> would fly in the face of the otherwise 'undisturbed soil' mandate.  
>> They do
>> intend to put rebar in the cylinder and attach the bolts to anchor 
>> the base
>> to these.
>>             Has anyone ever seen this method or done this before?  -Mike
>>
>
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