[TowerTalk] (Repost) Engineering advice on above ground foundation

[Joe - WDØM]

As I pointed out - similar, but my issue was bedrock, his is water 
table.  It's never too late....

73,

Joe
WDØM

David Gilbert wrote:
> Your foundation is pinned to the bedrock ... his isn't.
>
> It seems to me that the opportunity for N2WQ to properly engineer his 
> installation may have come and gone.
>
> 73,
> Dave   AB7E
>
>
>
> Joe - WDØM wrote:
>   
>> Hi Rudy,
>>
>> My situation is similar, although different.  I have an above ground 
>> base but without the water table issues.  My problem was bedrock.  The 
>> tower has been up for over 5 years without a problem, and has withstood 
>> 90 mph gusts that blew out the windows on my home.
>>
>> http://www.wd0m.com/
>>
>> Click on Ham Radio, then Tower Project.  I hope this gives you some 
>> confidence that it will work!
>>
>> 73,
>>
>> Joe
>> WDØM
>>
>>
>> Rudy Bakalov wrote:
>>   
>>     
>>> Looks like first post came out very difficult to read so here it is again.
>>>
>>> I have a rather complex situation that certainly can benefit from the collective wisdom and experience of this reflector.
>>>
>>> My property has a very high water table and as a result my builder and I decided to build the tower foundation mostly above ground. Specifically, we dug a hole, filled it with compacted gravel that is above the water table, covered the gravel with very thick sheets of plastic, and inserted 2' styrofoam boards around the base. Then we poured the concrete.  As a result, only about 1.5' of the foundation is below ground, 3.5' are above.  The overall dimensions are 10' x 10' x 5'.
>>>
>>> Now I wonder what are the additional engineering issues we need to address to make sure the foundation will last and the 90' AN Wireless tower will stay up.  Currently, we have identified the following next steps:
>>>
>>> 1) Waterproof the concrete using silica based solutions, such as Penetron, Xypex, etc. as permanent solution against water getting into the foundation
>>>
>>> 2) Add extra waterproofing using tar/asphalt-like solutions to make sure we have extra protection should cracks emerge
>>>
>>> 3) Add styrofoam boards to prevent against freezing (it gets as cold as -25F in Ontario)
>>>
>>> 4) Backfill around the structure to create a mound that takes the rain and melting snow water away from the concrete. I have also proposed we layer more plastic sheets about a foot below the mound surface to make sure no water gets near the foundation
>>>
>>> Any further comments and suggestions will be greatly appreciated.
>>>
>>> Rudy N2WQ
>>>
>>> _______________________________________________
>>>
>>>
>>>
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>>>
>>>   
>>>     
>>>       
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