To hold my tower's cage in place (it was a bit wobbly in the hole) prior
to the concrete pour, I wire tied the top horizontal rebar pieces to the wooden
form above ground. I drove few 16d duplex nails into the tops of the form
around the perimeter. Then I wired each top rebar element to a nail, pulling
the wire tight.
When the concrete pour reached within a foot of the top rebar, I cut the
tie wires at the rebar and pulled them out. Don't cut them after the pour is
completed; you'll have small pieces of steel wire exposed to the elements and
they'll corrode and expand, possibly damaging the top of the concrete and
leaving a way for water to ingress.
BTW - duplex nails have two heads on the end, separated by about a
quarter-inch. You drive these things into temporary wooden forms up to the
first head. This leaves a quarter-inch space above for your claw hammer,
making it easy to remove the nails to disassemble the forms. This nail space
is where I tied off the wires holding the rebar cage during the pour. You can
also use ordinary nails driven part way into the top of the forms, but I had
the duplex version on hand for the form itself.
Gene Smar AD3F
-------------- Original message ----------------------
From: Red <RedHaines@centurytel.net>
> Hi, TTrs;
I wired the
> legs in place inside the cage and I blocked the cage and tower legs with
> 2 X 4 members wedged against the sides of the hole to prevent movement
> while pouring the initial foot or more of concrete. Once that much
> concrete was in the hole, I pulled out the 2 X 4 members with ropes I
> had tied to them for that purpose and finished the pour.
> 73 de WOØW
> TowerTalk mailing list
TowerTalk mailing list