Ditto Dave, I had a very hard time reading the message, to the point i
went in and broke it up just so i could read line by line again..
mac/mc w5mc
On 4/4/2019 9:45 AM, Dave Hachadorian wrote:
I have seen an increasing number of posts such as the one below, where
the text is all compressed into one hard-to-read paragraph. Anyone
know what's going on? Maybe it's something on my end? I don't think
it's limited to Towertalk, but it may be limited to contesting.com.
I'm not sure.
Dave Hachadorian, K6LL
Yuma, AZ
-----Original Message----- From: Byron Tatum
Sent: Thursday, April 4, 2019 7:25 AM
To: Towertalk Reflector
Subject: [TowerTalk] 130' 45G Gyued Tower Questions
Hello- I have some questions regarding the effects seen on anchor
rods when installing first level of guys on a 130' 45G
tower: The tower is installed per Rohn 130 MPH specs, using
same spacing, dimensions and angle of anchor rod (38 deg). The anchor
rod is made identical to the Rohn GAC5655TOP being 10' long, 1.25"
high strength rod, 1/2" 50 KSI plate at top end of rod but with only 3
drilled 13/16" holes for turnbuckles, hole spacing same as Rohn (5655
anchor has 5 turnbuckle holes) and concreted in a concrete anchor
built per Rohn AB3 dimensions. I have the tower
free-standing at 41' right now using a 5' concrete base section. A guy
bracket was installed at 35' per Rohn spec and I attached the
guy/turnbuckle to bottom hole in anchor rod plate and tensioned to
around 600#. I am seeing the anchor rods bend downward to an angle of
around 30 deg as I increase the tension on guy wire. It appears the
rods have a very slight, just barely perceptible bow in them, possibly
from the wrenching action of the pull being from several inches below
the rod center (as plates are welded to rod and not
pivoting). I left the "slots" cut in ground (where anchor
rod angles upward from top of concrete to surface of ground) unfilled
as I wanted to be able to observe the effects on them and to install
protective sheaths on them, where they exit the ground, when tower is
finished plus to backfill these with clean sand. The rods were tarred
and wrapped for corrosion protection. I backed the
turnbuckles off to a much less guy wire tension in order to reduce the
downward pressure on anchor rods and to allow me to install cribbing
under the turnbuckle plates to restore my anchor rod angle back to 38
deg. This is the first tower that I have installed with fixed
turnbuckle plates welded on an anchor rod. It seems that all of the
ones in past had the pivoting turnbuckle plates and I did not notice
these effects as the plates pivoted way upward with only bottom guy
wire attached. So my questions are --1. Has anyone else
observed these things in installing a similar tower? Possibly if I had
backfilled the anchor rods these effects would not have been as easy
to detect.2. Would anyone have an opinion regarding using strong
cribbing under the turnbuckle plates in order to maintain original
installed rod angle of 38 deg. as I restore tension to around 600# on
bottom set of guy wires? I imaging that when I get the second
level of guys installed, of which turnbuckle holes are centered on
ends of anchor rods themselves, the rods will be pulled upward, closer
to the installed angle of 38 deg, and with installation of top set of
guys all will balance out for rod angle of 38 deg. My first
experience with fixed turnbuckle plates on anchor rods. Thanks for any
comments or advice.Byron W5FH
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