[TowerTalk] Rebar Cage Question

[WO0W]

Welding works if you specify weldable rebar. It is not hard to find and 
is not much more expensive than the uncontrolled rebar that is made from 
scrap metal.   Welding  enables the rebar to distribute a lightning hit 
more evenly throughout the cage.  It is easily welded with E7018 rod.  
If properly designed, it becomes a Ufer ground that provides a large 
area of contact to the earth for grounding.  Contrary to some claims, a 
Ufer ground does not lead to damaging the concrete when it conducts 
lightning.  A Ufer ground is not a good HF ground and, for good 
lightning protection of equipment connected to the control lines and 
feedlines from the tower, the base should be supplemented by at least 
one circle of six ground rods about 16 feet from the base.

73 de WOØW

n9lah at comcast.net wrote:

>OK now we are getting to the question I have been wanting to ask. Can a rebar cage work just as well if it is cut and welded together rather than bent and wire tied? It is my plan but thought I might toss the idea out for the critics.
>
>Phil
>N9LAH
>
>-------------- Original message -------------- 
>From: Robert Hess <w1rh at yahoo.com> 
>
>  
>
>>Just built the cages for my Rohn 45 guy anchors. 
>>First time for me. Quite a learning process. These 
>>cages are only 2.5/2.5/1.5 and I could not make it 
>>work by bending the re-bar. Cut each piece. Adding 
>>diagonals made a hell of a difference. I also used 
>>multiple ties on each junction plus lots of extra 
>>re-bar pieces. Now they are quite sturdy and ready to 
>>be set in place. 
>>
>>Bob 
>>W1RH 
>>--- Larry Burke wrote: 
>>
>>    
>>
>>>Are there any tricks of the trade when it comes to 
>>>making sturdy rebar 
>>>cages? I have used tie wires, along with the tie 
>>>wire tool, but mine tend to 
>>>flop around when complete. Could I be tying the 
>>>wires incorrectly? I realize 
>>>it doesn't make a whole lot of difference once the 
>>>concrete is poured, but 
>>>I'd like to understand how to give these a more 
>>>professional look and feel. 
>>>
>>>On a somewhat related issue, an area Lowe's store is 
>>>now stocking a ground 
>>>clamp designed specifically for use on rebar. First 
>>>time I have seen these 
>>>at a big box store. They look similar to the type 
>>>that clamps on a water 
>>>pipe, but the clamp is designed to grab a smaller 
>>>diameter "pipe" (the 
>>>rebar) and accommodate a slightly larger ground 
>>>wire. Useful for anyone 
>>>planning a UFER ground, although I suspect a 
>>>exothermic weld connection 
>>>would be better. 
>>>
>>>
>>>Larry Burke WI5A 
>>>
>>>
>>>
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