Rudy,
In 1912, German company built an 820 foot radio tower not far from you on an
ocean front island in Tuckerton, NJ. They also had a high water table problem
and built most of their tower and guy wire foundations above ground.
http://mcnally.cc/tuckmain.htm
They must have done a good job, because the huge foundations are still there!
One is right next to a house where N2GUU, N2NFH and KA2PFL live:
http://ka2pfl.tripod.com/homeeast.jpg
This one is in the middle of a street:
http://www.wikimapia.org/#lat=39.5584565&lon=-74.3706393&z=18&l=0&m=a&v=2&show=/556094/Block-in-middle-of-street-guy-anchor-for-tower&search=tuckerton
And this one too:
http://www.wikimapia.org/#lat=39.5580264&lon=-74.3705642&z=18&l=0&m=a&v=2&show=/556116/Block-in-middle-of-street-guy-wire-anchor-for-tower&search=tuckerton
73
Frank
W3LPL
---- Original message ----
>Date: Fri, 5 Jun 2009 12:27:13 -0700 (PDT)
>From: Rudy Bakalov <r_bakalov@yahoo.com>
>Subject: [TowerTalk] (Repost) Engineering advice on above ground foundation
>To: towertalk@contesting.com
>
>
>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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