Hi Gerald,
Actually I’m use to using grips and have done many towers... I’ve done it all
before – I’ve just not used 5/16” and don’t know if in situ I’ll be able to
estimate it accurately. I have 3 older grips that will function as the
‘connection point’ for pulling each guy. What I don’t have is three come
alongs. I have instead, what I used on the 1/4” guys, are three ... I’m not
sure what you’d call them... they’re rope and there is a block with a rotating
cog in it that locks on the rope when you pull it through adding tension in the
process... I don’t know if they’re able to handle any more than about 150# of
pull – so there is my question ... if I get to that amount of pull will the
turnbuckles have enough room to pull them from there to full 1100#? I’ve Google
searched to see if there is a chart of initial tension and how fast say per
inch of displacement of the turnbuckle the force goes up ... its obviously a
non-linear curve.
and I’m having trouble getting people to just lift and stage the antennas let
alone with any experience at the guys so its looking more like I’ll be running
from one to the other (140’ out from the base and not a direct shot from one to
the other). I’ll get my work out.
thanks Gerald.
Gary
From: TexasRF@aol.com
Sent: Tuesday, October 11, 2016 9:15 PM
To: rxdesign@ssvecnet.com ; towertalk@contesting.com
Subject: Re: [TowerTalk] questions on the use of a man-bucket and guy
tensioning 5/16"...
Gary, you are on a steep learning curve! Most installers use a come-a-long to
pull the initial guy tension and hold the guy in position while the lower guy
grip is installed.
If you install the grip about 75% it is relatively easy to remove and
reposition the grip. Once installed 100% you likely will destroy the grip
trying to remove it. Once you are sure of the proper position it is easy to
complete the grip installation.
After the first few grips are installed you will get the hang of it and get the
position correct on the first try.
If you have a man on each anchor it will go a lot quicker but you will need
three of the come-a-longs for best speed. a half installed big grip makes a
quick method of attaching the come-a-long to the guy. Some installers use a
"pork chop" (I forget the actual proper name) to grab the guy cable; perhaps
you already have three of these.
73,
Gerald K5GW
In a message dated 10/11/2016 7:18:06 P.M. Central Daylight Time,
rxdesign@ssvecnet.com writes:
Hello,
This is directed at those that have had direct experience with the use of a
crane and a man bucket.
My antenna/tower project, at least the major part of it (one of the two
towers) is finally getting close to being done. I’ve ordered the crane for the
end of next week ... so I can get a man bucket for an additional $150. There
are 6 large yagis to be installed – well 5 and a rotary dipole for 80/75 which
is also BIG in that regard ... there’s currently 74’ of tower up on the K0XG
rotating base and 2 rings ... I’ve built another 60’ of tower with the second
ring on it ... that will go up first and the top section of guys installed.
then I have 14’ of tower that will already have mounted on it (I hope) the
rotary dipole at the top and a 5 element 50’ boom 20 mounted just above the leg
of the tower (R55). That whole assembly will go up as one and thus 2 antennas
will be finished once this is bolted in to place.
Then there are 4 yagis to go up along the height of the tower from 124’ down
to 45’. I had planned on just having a guy on the tower stuff (no choice there
of course) ... and then have him climb down the tower as we go from the top
down with the 4 remaining antennas 124’, 90’, 75’, 45’. This means I’ll have to
lash up the antenna on the ground to the crane hook and then of course the
crane will raise it up to him where he can hopefully bolt it in place (2 plates
on the boom already in place for the boom to tower mount).
But the guy that is doing the climbing is saying the man bucket will make
putting the antennas up easier. Having never used one I’m writing to get the
comments of those that have used one.
How is the antenna ‘held’ to the man bucket? And whatever that is does that
get in the way of mounting the antenna when at the tower. I.e. you have the
side rails of the man bucket that would be ‘hitting’ the tower – will the
antenna ‘move in” to position and still be SAFELY held until bolted in place?
Is it really any faster?
I assume it could be considered safer as the guy would be in the man bucket
and not climbing the tower but obviously one expects whomever that is to be
careful and always be strapped in when climbing ...
thoughts please?
And on another note: the top guys are 5/16” mixed with 11200# philly (50%)
... how much tension do you need to pull out of the ‘free’ cable before
attaching it to the turnbuckle? I’m worried about not pulling enough and having
to redo the big grip ... on the bottom set of guys (the bottom 2 sets are 1/4”)
I managed to do just that – I pulled too much and had to redo the big grip. Of
course on the 5/16” the worry is more that I won’t pull enough and will run out
of turnbuckle adjustment space. Put another way: how fast does the tension go
up as one adjusts the turnbuckle? If the turnbuckle has 12” range – will that
pull up even a relatively loose guy to full tension of 1100# before running out
of adjustment room?
Gary
K9RX
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