[TowerTalk] Rohn BPC25G

[D. Scott MacKenzie]

Thank you - I appreciate it.

The fender washers and nuts would be located in the concrete - they serve as
resistance to prevent pulling the pin out.

Looks like I am good to go then - I can start getting the foundation and
stuff ready for the tower....Thanks!

Scott

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com]On Behalf Of K7LXC at aol.com
Sent: Thursday, May 17, 2007 10:13 AM
To: towertalk at contesting.com; kb0fhp at comcast.net
Subject: Re: [TowerTalk] Rohn BPC25G



In a message dated 5/13/2007 11:32:34 A.M. Pacific Daylight Time,  towertal
k-request at contesting.com writes:

>  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?


    Hmm, I don't know. I don't recall seeing a second  hole in the base
plate. Doesn't sound like anything to worry about.

>  The pier pin, Rohn 3/4x12PP, is also a smooth pin, without  any other
features.  There is nothing to hold it in the  concrete.

    Except the concrete or some epoxy.

>  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.

    Sure, I've done that before. There really aren't  any lateral forces on
the pier pin so the all-thread will be plenty. What are  the fender washers
for? Don't put them between the concrete and the baseplate  - the baseplate
should sit right on the top of the concrete.

    Be real careful with your temporary guying as you  put it up and you'll
be good to go. I personally don't see any value for using  a pier pin with
25G
- the forces are pretty small. A pier pin is really for  big towers where
using it will help to equalize the compressive forces on the  legs -
something you
don't necessarily get when you bury the bottom section in  concrete.

Cheers,
Steve    K7LXC
TOWER TECH -
Professional tower services for hams
Cell: 206-890-4188








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