[TowerTalk] Rohn Tower Pier Pin install

[Jeff DePolo]

> I am using Rohn products and yheir guidance from the their book and my
> question is the correct way to install the 3/4" x 12 pin into the concrete ba 

For one of the smaller Rohn tower series that have a flat baseplate, the pier pin is really there only to keep the base from moving laterally during erection.  Once there is vertical load on the baseplate from the dead weight of the tower sections plus the guy wire reactions, the pier pin should not be considered, or even relied on, as a structural element - if that's not the case, then the tower has other, major, issues. 

Whether it is set into the pour or inserted into a hole after the concrete is cured doesn't matter whole lot.  It's easier to set it into the mud though, and (mostly) gets around the issue of water being able to get into the hole if you were to drill and epoxy the pin.

For a larger tower with an articulated base (as opposed to a flat baseplate), the pier pin is arguably more of a structural element, particularly under worst-case wind conditions, that should be included in the analysis and design.
 
					--- Jeff WN3A



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