For my TX489, I drilled some steel plates to match each pair if j bolts
(3 pairs). These, I slipped over the bolts so that they would fall over
the lower bend. This tied each pair together as an assembly. I was going
to tye wire each pair to the steel but did'nt get a chance since the
concrete truck arrived too soon. Any way, these pairs held together
precisely where they belonged and the tower base fit right over the
bolts. I am told, the "pro's" have trouble with j bolts quite often and
solve the problem by threading the nuts on and hitting the bolt with a
sledge hammer. I would not do this unless you are sure the concrete has
Patrick Barkey wrote:
> AC6TK wrote:
> 5)Insert anchor bolts thru holes in plywood and place appropriate
> double-nut/washer combo on threaded end on "top" of template w/"hook"
> end of bolt projecting below.
> 6)Use this template as top of form to cover existing 4x4x6' hole. If
> spec for SSV calls for larger dim. form., center on longer pieces of 2"x to
> support and enlarge hole appropriately.
> 7)Pour suitable concrete mix (don't forget the re-bar "cage"!) and
> wait necessary curing time.
> My comment:
> I did precisely this for my self supporting tower base. The problem is,
> the act of pouring the concrete twisted and turned my anchor bolts in
> ways that I could not perfectly correct. Now that the concrete has
> cured, the bolts are slightly off. Big pain.
> If I had it to do over again, I would pour first and then set the entire wood
> template/anchor bolt assembly down into the wet concrete. (How
> exactly I would avoid the rebar cage I am not sure. Perhaps by making
> precise markings of where it was?).
> -- Pat
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