Hi all;
The tower guy is correct. I have seen this for myself.
Bill Wall KC4UZ
----- Original Message -----
From: "Jerry Plemmons" <jerry@plemmons.net>
To: "Red" <RedHaines@centurytel.net>; "FireBrick" <w9ol@billnjudy.com>
Cc: "Andrew Pfeiffer" <va3pl@cuic.ca>; <towertalk@contesting.com>
Sent: Thursday, September 19, 2002 4:21 PM
Subject: [Towertalk] Rebar Cage
> I can recall a commercial tower design firm (1,000 and 2,000 foot
broadcast
> towers) telling me that you never run a ground cable through a concrete
base
> or guy anchor. That the rebar cage is intended for strength not
grounding.
> That if you run a lightning strike through the foundation or guy anchor,
the
> concrete will crack if the lightning tries to exit the concrete looking
for
> real ground ground or from the heat of the lightning. Is this theory
> incorrect?
>
> Jerry, K6JRY
> ____________________________________________
>
> -----Original Message-----
> From: towertalk-admin@contesting.com
> [mailto:towertalk-admin@contesting.com]On Behalf Of Red
> Sent: Thursday, September 19, 2002 3:56 PM
> To: FireBrick
> Cc: Andrew Pfeiffer; towertalk@contesting.com
> Subject: Re: [Towertalk] Rebar Cage
>
>
> In addition, welding all joints helps the rebar distribute lightning
> discharges through the concrete, making your base a "Ufer" ground, named
> after the investigator who established its value. The welded cage
> assembly can then be set into the hole and braced with 2X4, with wires
> or ropes to pull them out as the concrete is poured.
>
> 73 de Red
>
> FireBrick wrote:
>
> >As a retired mason contractor, I can see where you are going.
> >You want the verticals stable so you can easily wire the horizontals on
> >while in the hold.
> >Ideally, rebar should not extend through the concrete, rebar should not
be
> >within 4" of the concrete.
> >This is to minimize moisture reaching the rebar and eventually rusting.
> >
> >If your worried about the rebar cage maintaining it's shape during
> >construction.
> >Stick the verticals in the ground at the surface. It's easier to work on
> >then in the hole.
> >Then have someone help you lift it and place in the hole.
> >
> >I also strongly suggest a little gravel in the bottom of the hole which
> >makes positioning the cage easier. You can wiggle it a bit to get it
plumb.
> >
> >The trick with all rebar cages is to maintain their shape and position
> while
> >dumping and vibrating the concrete.
> >If you gut a couple boards and drill holes to match the vertical rears,
you
> >can nail/clamp to braces on the surface.
> >
> >
> >----- Original Message -----
> >From: "Andrew Pfeiffer" <va3pl@cuic.ca>
> >To: <towertalk@contesting.com>
> >Sent: Thursday, September 19, 2002 11:36 AM
> >Subject: [Towertalk] Rebar Cage
> >
> >
> >>I become happy owner of TX455 crank up tower. I began planning the rebar
> >>cage.
> >>My questions is:
> >>Can vertical rebar members be driven let say 2 feet deep to the ground
at
> >>the bottom of the hole or this is NO NO...
> >>
> >>Andy - VA3PL
> >>
> >>_______________________________________________
> >>Self Supporting Towers, Wireless Weather Stations, see web site:
> >>
> >http://www.mscomputer.com
> >
> >>Call 888-333-9041 to place your order, mention you saw this ad and take
an
> >>
> >additional 5 percent off
> >
> >>any weather station price.
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> >>
> >>
> >
> >
> >_______________________________________________
> >Self Supporting Towers, Wireless Weather Stations, see web site:
> http://www.mscomputer.com
> >Call 888-333-9041 to place your order, mention you saw this ad and take
an
> additional 5 percent off
> >any weather station price.
> >_______________________________________________
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> >
> >
>
>
>
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> _______________________________________________
> Self Supporting Towers, Wireless Weather Stations, see web site:
> http://www.mscomputer.com
> Call 888-333-9041 to place your order, mention you saw this ad and take an
> additional 5 percent off
> any weather station price.
> _______________________________________________
> Towertalk mailing list
> Towertalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
> _______________________________________________
> Self Supporting Towers, Wireless Weather Stations, see web site:
http://www.mscomputer.com
> Call 888-333-9041 to place your order, mention you saw this ad and take an
additional 5 percent off
> any weather station price.
> _______________________________________________
> Towertalk mailing list
> Towertalk@contesting.com
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