The Rohn spec is to leave 4" exposed.
I use a U-bolt to clamp the rod to a piece of aluminum or steel angle that I
place diagonally across the form, checking measurement on the other diagonal to
make sure it is centered. I place this shortly after concrete is poured.
73/Jon
Jon P. Zaimes, AA1K Tower climber for hire http://www.aa1k.us/ Cell:
302-632-2353email: jz73@verizon.net or aa1k@arrl.net
-----Original Message-----
From: CEPitts <cpitts@ec.rr.com>
To: towertalk@contesting.com
Sent: Thu, Feb 18, 2021 5:20 pm
Subject: [TowerTalk] Rohn Tower Pier Pin install
Need the correct way to do this. In my search efforts could not find any
documentation involving this issue. Having installed and taken down
various tower installs in the past I am about to do a install involving
a pier pin with the standard Rohn galvanized base.
Previous experiences with installs and take downs has always been
sections and rebar placed in the hole, various fold overs and extension
towers but never a pier pin until now, Go figure!
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 base. Do I place the pin into the fresh concrete after it is
poured and of course before the concrete cures supporting the pin so it
is plumb and vertical above the base of the concrete by approximately 3-4" ?
Or do I drill out a hole once the curing has subsided in approx 30 days
and insert the pin with some epoxy concrete hardener applied to the pin
upon insertion?
I have a hammer drill but not relishing the thought of the latter with a
bit to handle the 3/4" diameter along with the cost of purchasing said
drill bit designed for concrete use.
Thanks for responses in advance, 73! Charles "Ed" K5OF in NC
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