It is not a good idea to put aluminum in the concrete, significant corrosion
can occur. If you are thinking of adding more sections to this embedded
aluminum tubing to make the vertical element, concrete is conductive so you
will need an insulated base. If it is free standing I would look at the base
bolts of similar sized light duty tubular towers. FWIW, I used steel
channel with around 1/4 wall embedded in concrete for my verticals.
John KK9A
To: towertalk@contesting.com
Subject: [TowerTalk] Vertical on concrete pad
From: garyk9gs <garyk9gs@wi.rr.com>
Date: Fri, 18 Aug 2017 15:17:20 -0500
Hello all,
I have an existing concrete base of several yards of concrete that i want to
mount a vertical to.
I plan on using a 2 1/2 inch OD , 36 inch long, piece of steel or aluminium
tubing (thick wall) with the end welded to a flat plate with gusset plates
every 90 degrees. This plate would bolt to the concrete with anchor bolts
epoxied into holes bored in the concrete.
My questions:
1) How do I calculate the size and thickness of the plate and gusset
material?
2) How many bolts and bolt diameter needed? Bolt length needed in the
concrete?
3) Should I use steel or aluminum? This is coastal FL so there is some
salt
to contend with. Steel would probably be painted unless I can find a local
galvanizing vendor.
4) the other thing I thought of doing was boring a 2 1/2 + inch diameter
hole
and just epoxying in the tubing. Not sure how to bore a hole that large and
deep. Maybe hire someone to do this?
Suggestions? I don't wsnt to over complicate or engineer this either.
73-Gary K9GS
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