FWIW, on the bottom end of each of the anchor rods from US Tower for my TX-472,
there is a 2"x2"x5/8" plate welded to a nut. The nut is threaded onto and
welded to the rod. See the last photo in this set on Flickr:
www.tinyurl.com/wa7prc-tower
Hank: It's not up yet but my target is next month.
vy 73,
Bryan WA7PRC
> Date: Sun, 15 Apr 2012 10:22:30 -0700
> From: Jim Lux
> Subject: Re: [TowerTalk] Anchor bolts for LM470
>
> On 4/15/12 9:53 AM, Rick Stealey wrote:
> >
> >
> >> There is no need and it is not recommended by
> >> American Concrete Institution (ACI)
> >> 318 design specifications for reinforced
> >> concrete to use hooked (J)
> >> anchor rods
> >
> > Again, remember, I had a hard time with Statics in
> > college so go easy on me, but
> > I always thought it was necessary to have a J to keep
> > the rod from turning.
> > But I guess even a tiny, very tiny, amount of bend
> > would do the same thing?
> >
>
> the friction between the concrete and the bolt
> is MORE than enough to resist the nut torque.
> This isn't a connecting rod bolt where you
> torque it down to preload the tension in the
> bolt so it never goes negative.
>
> You can finger tighten the nut to snug, and as
> long as you have some way to keep the nut from
> coming off (safety wire, cotter pin, second
> jam nut), then you're in great shape.
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