That's a long-debunked urban legend. Don't believe me? Do some web
searching, including the archives of this very forum.
Besides, there is nothing ... nothing ... in any description of a Ufer
ground that requires welding the rebar together. Crossed and tied
connections do just fine.
73,
Dave AB7E
On 1/3/2014 7:52 PM, Stan Labinsky Jr. wrote:
On another tack, from what I've read, not having the rebar
interconnected, that is, welded to itself and to the tower bolts is a
recipe for concrete block destruction from steam bursts during a
lightning strike, when strike current jumps over the poor/marginal
interconnects and creates huge point sources of heat within the block.
Welding also makes the block into a Ufer ground.
Stan
-----Original Message----- From: Patrick Greenlee
Sent: Friday, January 03, 2014 9:35 PM
To: towertalk-bounces@contesting.com ; towertalk@contesting.com
Subject: Re: [TowerTalk] Tack welding rebar
Maybe the majority would have to lug lots of heavy gear but I have a
plasma
cutter, 180 amp Mig, AC/DC stick welder, grinder, vise, O-A bottles,
Argon-CO2 bottle, 14 inch cutoff saw, and on and on and on all on my
single
axle welding trailer which is not hard to hitch up and get close to just
about anywhere on the ranch including antenna farm endeavors. I don't
think
I am unique.
Point 2: wire tied cages of rebar are not nearly as robust as
welded. It
is darned inconvenient to have rebar messed up under the forces
involved in
pouring concrete. Dimensional tolerances are much easier to maintain
with
weldments. Wire tied rebar is a very good thing with flat work like
slabs,
aprons, patios, sidewalks, and the like but more 3 dimensional work is
sometimes approached easier and with more confidence with at least some
welding. Must you weld? NO, but if you can it is sometimes better for
any
of several reasons.
Patrick NJ5G
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