I recently used the method suggested by Gene and it works well. I used sheet
rock screws instead of nails, but the idea is the same. Basically, you're
using the wires to "guy" the rebar cage in place. I can't recall exactly
when I cut the wires, but it was probably sometime after the concrete was
halfway up the cage.
73, Dick WC1M
> -----Original Message-----
> From: ersmar@comcast.net [mailto:ersmar@comcast.net]
> Sent: Wednesday, October 11, 2006 8:35 PM
> To: Scotty Rathjen; towertalk@contesting.com
> Cc: Scotty Rathjen
> Subject: Re: [TowerTalk] How best to keep the rebar cage
> centered in the hole?
>
> Scotty:
>
> Do NOT use the rebar in the foundation hole as an anchor
> point for your rebar cage. The ends of the rebars sticking
> into the dirt will eventually corrode and follow the rest of
> the rebar into the concrete mass. That could lead to
> cracking, especially that close to the top of the concrete.
> (That's why you're using paving stones in the bottom of the
> hole - to keep the rebar ends out of the dirt - right?)
>
> If you framed out the top of the hole to form a neat
> concrete crown for the top of the concrete pour, you can
> hammer in a few nails around that wooden form, leaving a half
> inch of nail sticking out. Then wrap some rebar wire around
> the upper rebar pieces and use the nails to hold these wire
> pieces in place. That will give some rigidity to your rebar
> cage while the concrete is being poured.
>
> If you did not use wood to form the top of your concrete
> base, then you can hammer some rebars into the dirt ON TOP of
> the ground, then anchor the rebar wires to these rebars.
>
> When the concrete gets near these top pieces of rebar,
> simply cut the wires off the rebar and pull the wires out of
> the form, then finish the pour. There will be enough
> concrete in the hole by that time to keep the rebar from
> moving any more. Don't let the wires stick out of the
> concrete while it's curing - corrosion can find its way into
> the concrete through the corroding wires.
>
> 73 de
> Gene Smar AD3F
>
>
> -------------- Original message ----------------------
> From: "Scotty Rathjen" <scotty@ashiko.com>
> > What is the best way to keep the rebar cage in the center
> of the hole
> > as I pour the concrete? The rebar cage is held together
> with wire and
> > when it sits vertical in the hole on the paving stones the
> cage wants
> > to sag against the side of the hole for support. Can I
> pound a 8 inch
> > piece of rebar into the dirt on the inside of the hole wall, a foot
> > from the top, and use a piece of wire to hole the rebar
> cage up in the position I want it to be in?
> > Is this a problem? Is there a better way?
> > 73 and thanks for any and all help.
> > Scotty W7SW
> > W7SW at ARRL dot Net
> >
> >
> > _______________________________________________
> >
> >
> >
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> > TowerTalk@contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk
>
>
>
>
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