[TowerTalk] FW: More crank-up questions

[Roger (K8RI) on TT]

On 12/1/2013 1:23 PM, Matt wrote:
>>> Recent, commercial rebar cages ordered with the towers have come through
> welded instead of tied.
>
>>> I have the wire, but it's a whale of a lot easier to weld it.  If it's
> good enough for the manufacturer, then it's good enough for me.
>
> Be aware that normal grade rebar should not be welded - the heat destroys
> its strength.   There is a separate grade of rebar available for welding.
> That said, in a crank-up tower application the foundation serves as ballast,
> so is not much tensile stress developed in the concrete - except in the
> vicinity of the anchor bolt embedment.

There is no anchor bolt assembly in this base.  The tower bolts to 1/2 X 
3 X 25: steel plates (ears) welded to 60" long # 10 rebar, and this has 
the rest of the rebar cage fastened to it in many places.

73

Roger (K8RI)
>
> Matt
> KM5VI
>
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