The ones I have used (mainly on Phyllistran) have a coating on the inner
surface of the grip which helps in the adhesion but I don't think it is
actually an adhesive per se. The instructions gave a few times the grip
could be unwrapped and rewrapped within a short time (a day or two I think)
on the ones I had.
If you wrap your hand around the index finger of the other hand and then
pull your index finger you can feel the resistance increase. I suspect it is
the same effect with grip and with the grip in a helical wind it probably
has much more resistance to slipping. But as noted, the grips do work. Power
companies have used them for years as guys for power poles. Mine have been
up about 10 years but others have had theirs up much longer than that.
73, Larry W6NWS
-----Original Message-----
From: Patrick Greenlee
Sent: Thursday, January 07, 2016 3:12 PM
To: towertalk@contesting.com
Subject: Re: [TowerTalk] My first introduction to guy-wire dead end grips
Unfortunately I don't know how they work, just that they do work and
very well in deed. I would guess it is some mechanical process similar
to Chinese finger cuffs or the wire pulling thingies similar thereunto
but I'm not a Mechanical Engineer. I have a good friend who has a MS in
Mechanical Engineering from UCLA plus over 35 years of hands on
experience who helped me install them on a 4-way guyed tower. I have
made him Bcc on this email and hopefully he will enlighten me so I can
pass it on. A lot of them in service and I have never heard of one
loosing its grip. Anyone ever know about one loosing its grip?
Patrick NJ5G
On 1/7/2016 12:49 PM, dw wrote:
I'm trying to understand the use of pre-formed wire-wrap dead-ends for
guy-wires.
If I understand the install process, the guy-wire itself doesn't wrap
around the lower anchor fixture.
But the dead-end goes into the lower anchor fixture and the dead-end
then wraps around the guy-wire.
First the guy-wire tension is pulled up to pre-tensioned position.
Then the dead-end is fed through the anchor fixture.
Then one leg of the dead-end is wrapped around the guy-wire...either
wrapped all the way or part way.
Then the other leg of the dead-end is wrapped.
And then the wrapping is complete....I think that approximates the
installation steps.
The question I have is, what is supposed to keep that wrapped dead-end
from slipping off the guy-wire?
Hard for me to believe it will grip the guy-wire just being wrapped
around it, especially when the guy wire is fully tensioned.
Why not put forged guy-wire clamps around the dead-end after its wrapped
to ensure it won't slip off the guy-wire?
What am I missing?
Also, companies like Hubbell and AED manufacture straight-type bolt-on
clamps that come in different lengths....like 6 inches with 3 bolts.
How does the bolt-on clamp assembly compare to the dead-end, in terms of
reliability and pull strength?
Thanks!
N1BBR :-]
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