Raising (Hell) Beams

John.Evans@comsat.com John.Evans@comsat.com
Thu, 9 Jan 1997 11:48:39 -0500

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        Lee, Depending on the height of your mast above the tower
        you may not want to attach the rope to it, lest you bend 
        or break it. If you think about it,you put an enormous 
        sideways force on the mast when trying to raise a heavy 
        beam with the supporting (tram-line) rope reasonably taut. 
        One option is to attach the tram-line to the top of the 
        tower (always assuming it can handle the sideways strain) 
        and use a come-along and/or a gin-pole to get the beam to 
        the right height on the mast. Alternatively, you can use a 
        second rope in the opposite direction to the first (suitably 
        secured of course) to serve as a back-stay to relieve the 
        sideways strain imposed on the mast by the tram-line rope. 
        In my experience, it is best if you can attach the tram-line
        to a point a good bit higher than where you need to attach 
        the antenna. You can then operate without the tram-line rope 
        being too taut, and once you have raised the antenna almost 
        all of the way up the tram line, slacken it to allow the 
        antenna to come in to the right place. While pulling the 
        antenna up the tram line with a tractor has much to commend
        it, you need to have a person on the tower to watch that the 
        pull rope, where it is tied to the load, does not reach the 
        pulley through which it is being pulled! My tractor could 
        not sense the increased strain when this happened, and the
        rope broke allowing a 6-element 20-meter beam (60 ft boom)
        to slide back down the tram-line and,on reaching the ground,
        turn itself into a prettzle! John N3HBX.

______________________________ Reply Separator _________________________________
Subject: Raising (Hell) Beams
Author:  Lee Buller <k0wa@southwind.net> at INTERNET
Date:    1/9/97 9:24 AM

Ladies and Gentlemen,
I ask for a "cookbook" method raising large antennas.  So far, I haven't got 
any pictures, but lets see if I can write a little verbage here as to what 
people are telling me.
1.  Place a rope from the top of the mast to a solid connecting point away 
from the tower.
2.  Install two pullies on the rope.
3.  Move the antenna under the rope and secure it to the lower pully on the 
rope.  The boom should be perpendicular to the rope.  Make sure that the 
boom to mast clamp is facing the right direction.   The antenna should be 
tied to the balance point.  
4.  Attach and 3 to 4 foot arm on the boom parallel to the rope using a 
U-Bold.  At the outer reach or the arm attach the second pully.  You now are 
supported by two pullies.  The reason to put the arm on the boom to act as a 
lever and keep the antenna from rolling over or flipping while raising the 
antenna.  It cannot flip over with this arraingment.  
5.  OPTIONAL:  Tag lines.  A tag line can be place on each end of the boom 
to keep the antenna horitontal during lifting.  Tag lines are very long 
loops of rope which can be taken off after the antenna is in place.  Smaller 
rope or cord could be used for the Tag Lines
6.  Place a pully at the top of the tower and string a pull line through the 
pulling and attach it to the arm on the boom of the antenna.  The pull line 
rope then goes to the ground.
7.  Slow pull the antenna up the rope until it comes to a place where you 
want to attach it to the mast.  A person on the ground might have to loosen 
the tram line to allow the placement of the antenna on the mast.  I suggest 
that a "hay-knot" be used at the lower end of the tram line to insure that 
the rope doesn't get out of hand.
Please make comments and suggestions as to this very simple seven point 
cookbook method.  I would like to know what I missed because I have never 
done it this way before.  I want to incorporate your thoughts and experience 
into the cookbook.  Thanks
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Date: Thu, 09 Jan 1997 09:24:15 -0600
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Subject: Raising (Hell) Beams
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