I used the second method on all mine. Tie the bottom to the rebar cage then
there are just 2 angles to set. First line up the rod with the tower base
in azimuth and drive a stake there. Then use a level that reads the
elevation angle and dig down next to the stake to get it down to the right
angle and tie it to the stake... done.
The hardest part is being sure that everything is tied solidly enough that
it won't move when the concrete is poured. Remember, pouring concrete is
not like pouring water, even though it isn't moving very fast it is very
heavy and will easily push around the rebar if not properly tied.
David Robbins K1TTT
e-mail: mailto:k1ttt@arrl.net
web: http://wiki.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://k1ttt.net:7373
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
Richard (Rick) Karlquist
Sent: Saturday, June 11, 2016 03:08
To: towertalk@contesting.com
Subject: [TowerTalk] Advice needed on embedding guy anchor rod in concrete
deadman
I'm planning some concrete deadman guy anchors using Rohn GAC303 or
Endurance Helix4-54 anchor rods, to be embedded in the concrete. I am
looking for suggestions on how to fixture the rod correctly to prepare for
the concrete pour.
Obviously, I need to get both the azimuth and elevations angles correct so
that the guy cable pulls in a pure axial mode, without putting a deflecting
load on the rod. I'm trying to brainstorm some positioning technique. Any
suggestions? How about if I pre-attach the rod to a rectangular piece of
plywood at the correct elevation angle. Then I mount the plywood such that
it is square and plumb with respect to the foundation perimeter?
Alternately, I tie the bottom of the rod into the rebar cage and install a
temporary post in the ground that will support the top of the anchor rod.
Seems difficult to get this post correctly positioned in 3 dimensional
space.
Surely someone has solved this problem before.
I don't remember seeing any previous discussion of it on TT.
Rick N6RK
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