First, the disclaimer. I just installed a 50 tower for a commercial
application and used the pier pin because it was part of the engineered
specifications, and I had an engineer on the job that was a stickler for
things like that. That stupid pier pin is part of the base design, so I
used it.
Second, the reality. That pier pin does nothing except keep the tower base
from shifting horizontally as far as I can tell. In the past on my own
installations, I've dropped a 'J' bolt or foundation bolt in the pour, tied
to some steel in the base, and used that in place of the pier pin. Makes it
nice to put a timber washer and nut on while you are stacking up sections so
it at least stands there on it's own for the first couple sections.
Regarding the second hole, a couple times that I used it, I drove a ground
rod in before pouring the base, and made it pop up in that second hole just
for extra grounding.
Your mileage may vary of course, good luck.
N7HQR
> Gentlemen:
>
> I have the Rohn BPC25G, which is the concrete base plate for 25G. It
> requires a single pier pin, but there are two holes - one in the center,
> and
> one at the edge of the plate. I realize I use the center pin, but what
> purpose does the other hole serve?
>
> The pier pin, Rohn 3/4x12PP, is also a smooth pin, without any other
> features. There is nothing to hold it in the concrete.
>
> Would 3/4" threaded rod (material is similar to the pier pin), with large
> fender washers also serve as a better pin - at least there would be
> something to hold it in the concrete. There is nothing that I have found
> in
> the Rohn catalog that would provide me guidance.
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