On 6/10/16 8:08 PM, Richard (Rick) Karlquist wrote:
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.
I would think of some sort of wooden cribbing - not a single post
because it's easy to knock it, but maybe a couple of posts and wire them
together?
Sure, you want it "reasonably close" to aligned, realistically, 10-15
degrees is probably close enough. The rod will bend a bit under the
load, won't it?
When I worked at a place where they placed the anchors with a hydraulic
system on a truck, they basically got "close" to the right orientation
as they screwed them into the ground. When we loaded the guys, either
the shaft of the anchor bent or there was an angle between the guy and
the shaft, depending on the load and the size of the shaft (it takes a
fairly hefty load to bend a 1" solid bar of steel).
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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