Wes:
From your description it sounds like you're installing a pier and pad
type of foundation. That is, the base is a flat, thick concrete slab ( your
9' X 9' X 18" pad), and the tower actually gets bolted to a tall, slender
column (pier) of concrete (5' X 5' X ??) that extends upward from the slab.
That's the way these things are usually done - two distinct pours. Just
make sure you (or someone you've hired) backfills properly after the
concrete cures and you've removed the form for the column (you WERE planning
on removing the form, weren't you?). The backfill material has to be
compacted while it's being replaced. You can use a tamping plate to pound
the dirt around the column as each foot or two has been shoveled back in. A
real PITA, but necessary. The commercial projects, rather than
tamp-as-you-go, use a bulldozer to run back and forth across the fill after
it's all been replaced.
BTW, how deep is the excavation in total?
73 es GL de
Gene Smar AD3F
-----Original Message-----
From: Wes Cosand <wz7i@arrl.net>
To: towertalk@contesting.com <towertalk@contesting.com>
To: <towertalk@contesting.com>
Date: Saturday, November 30, 2002 7:54 PM
Subject: [Towertalk] Pouring base of tower
>I am planning the installation of a self-supporting tower. My contractor
>asked me a question to which I don't know the answer. Is there any reason
>why he cannot pour the base in two pours as long as they are tied together
>by the rebar cage? The plans call for the foundation to be 9 x 9 at the
>base and then 5 x 5 at the surface. He would prefer to pour the 18" thick
>9 x 9 foot section before the 5 x 5 foot section. Any reason why not?
>
>Thanks
>
>Wes, WZ7I
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