[Antennas] RE:Re-bar "Cage" To Use For Your Tower

2002年9月09日 21:25:44 -0400

> >From my observation, Jacqui, and talking to varius concrete/re-bar experts 
> in the area, it is not a good idea to "weld" re-bar when constructing a 
> cage for a foundation or tower base (also a foundation).
>> Welding at the intersections of re-bar severely weakens the elements of 
> the "cage" (both in the vertical and horizontal planes) and should not be 
> used!
>> Instead, the pieces of re-bar (or "rebar" as more commonly used) should be 
> tied together using galvanized wire, much like you would use a "twistie-ty" 
> to seal a trash bag or the end opening of a bag of sliced bread.
>> Check your local highway construction designs (that is, if they use 
> concrete) and you'll see that the re bar elements are "connected" by using 
> steel wire "wraps", and not by welding.
>> I don't know the details of why all of this is so, but it just is, Jacqui! 
> I would tend to follow the real experts in this respect when it comes to 
> rebar.

absolutely! Welding (cad, arc, or any kind) destroys the high tensile
strength of rebar. But when the purpose of the rebar isn't
strength....but dispersing the ground current over a large area....then
the extremely low resistance of a welded joint is needed.
regards
lyn
wa4geh