A better knot than half-hitches for such a task is the PRUSSIC. With either
the prussic or half hitches, rather than the "finger trap" approach, you
have a part of the cable in front of the knot, being pushed, instead of
pulled, and it's liable to hang up if it meeds an obstacle.
http://www.survivaltopics.com/survival/how-to-make-a-prusik-knot/
-Rex-
Rex Lint, Consultant
26 Brek Drive
Merrimack, NH 03054
PH: 603-860-7651
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of Daron Wilson
Sent: Tuesday, April 14, 2009 11:18 PM
To: 'Glenn Thorne'
Cc: 'Tower Talk'
Subject: Re: [TowerTalk] Pull ropes in buried PVC
The question is how to make the 'head', the interface of the pulling rope to
the product. The simplest commercial way is a cable grip, a device made of
steel wire much like the 'chinese finger cuff' kind of thing, you slip it
over the cable, pull it tight and wrap with tape. Andrew makes a hoisting
grip for various sizes of cables that laces up the side, so you can slip it
around existing cables and then unlace it when they are in place.
The less expensive way is a few half hitches around the coax, then wrap the
head with tape and pull it.
Unless you are hoisting a hundred feet of really heavy line, I don't see a
problem with careful half hitches. If you use mule tape, it lays nicely
against the cable and doesn't deform the jacket. We pull miles of fiber
optics and the like with a simple clove hitch backed up with a couple of
half hitches and a tight wrap of electrical tape.
Good luck
> -----Original Message-----
> From: towertalk-bounces@contesting.com [mailto:towertalk-
> bounces@contesting.com] On Behalf Of Glenn Thorne
> Sent: Tuesday, April 14, 2009 8:06 PM
> To: towertalk@contesting.com
> Subject: Re: [TowerTalk] Pull ropes in buried PVC
>
> Jim,
>
> How do you attach the cable to the pull rope? Lot's of electrical
> tape?
>
> A related question: what's the best way to get a coax run up the tower?
> The
> last time I did this I just tied the coax to a rope and pulled it up,
> taping
> the coax to the tower as I came back down. But that was only a 40ft
> tower.
> I have a bit more to go this time and am worried about deforming the
> cable.
>
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