main element will be plenty of manpower at the guy anchors....this is the
costliest part of this type of installation...the time it takes to set the
guys...I would make sure you had three crews, one for each guy point...and
all three crews were fully outfitted with the right hardware to do the job
be it 3 comealongs, 3 tensioning gauges, three sets of wrenches, etc....also
make sure he is not billing you tim e from when he leaves his place, stops
to make small chat with the convenience store chick over a cup of coffee,
etc...
k4oj
----- Original Message -----
From: "Bill Ralston" <n7vm@lgcy.com>
To: <towertalk@contesting.com>
Sent: Friday, February 01, 2002 11:53 AM
Subject: [TowerTalk] Rigging (crane) question
>
> I'm putting up 100' of Rohn 55 (two level guying on pier pin). I am
> thinking of using a crane to put it up for both time and safety
> considerations. Cost is pretty minimal (about $100/hour - the same rate I
> bill out my consulting time at!). After talking with a crane company, we
> think the easiest way to go might be the following:
>
> - Assemble all 100' of the tower on the ground
> - Install rotators, mast, guy anchors, and guys (let guys drape down)
>
> Pick the whole mess up from the top end with the crane, set it on the pier
> pin, set and tension the guys, then climb the tower and disconnect the
> crane.
>
> Use the crane to place the three antennas.
>
> The total weight of the tower with rotors and mast etc. is well within the
> capacity of the crane. I'm a little bit worried about the bending on the
> tower. I recall seeing that you aren't supposed to hinge up more than 30'
of
> Rohn 25, 40' of Rohn 45, and 50' of Rohn 55, but I can't find it anymore.
>
> I tried to do some calculations, and it looks marginal to me, but I don't
> really trust that I know what I am doing.
>
> An alternative would be to lift up just the first 50' of tower, guy it,
and
> then use the crane to stack 1 or 2 sections at a time on top of that. (I'm
> hesitant to try and get too long a piece of tower lined up property on the
> lower part). Obviously this would take quite a bit more time (both for
the
> crane and for the tower climber).
>
> Any comments or actual experience?
>
> 73 de Bill n7vm@lgcy.com
>
>
>
>
>
>
>
>
> ________________________________________________________________________
> Where do you get ICE bandpass filters & beverage matching boxes? The
> same place that pays for the hosting of this list: The eHam Store.
> Order online at http://store.eham.net.
> -----------------------------------------------------------------------
>
> -----
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>
________________________________________________________________________
Where do you get ICE bandpass filters & beverage matching boxes? The
same place that pays for the hosting of this list: The eHam Store.
Order online at http://store.eham.net.
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