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.
Click on Ham Radio, then Tower Project. I hope this gives you some
confidence that it will work!
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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