No form is necessary in the bottom of the footing. The earth retains the
concrete.
That is if the earth does not cave in. It may, and just use extra concrete.
The most important part is holding the sleeve or the post vertical. That is
easily done with 1x4's and stakes.
A plywood form in the hole is unnecessary. jloomis construction and
concrete
"hillpc" wrote in message
...
I'm making a home tennis court out of an asphalt paved area. I've
already bought the net and posts. The specified concrete footing for
each tennis net post is a 30" square at the bottom, tapering up over a
height of 42" into an 18" diameter circle at the top. A drawing is at
http://sportsbuilders.org/page.php?id=96&from[]=11&from[]=12&from[]=13&.
Could I use 3/4" plywood to make a form strong enough to contain this
much concrete without blowing out or breaking? I think the bigger job
may actually be cutting out a big enough square out of the asphalt
(32"?) so I can then rent a 30" auger to dig 42" deep, cut the corners
out to a square with a shovel, and then drop the empty form in, and
somehow hold it down while pouring the roughly ton of concrete into
each one. After stripping the form, backfill with dirt and repair the
asphalt. Any suggestions for me? I'm thinking readymix concrete for
the little over 1 cubic yard I need to avoid all that mixing, and it's
probably cheaper than buying eighty 80" bags of concrete mix.