[TowerTalk] Lifting a pre-built section of tower using a crane - how to strap it off

[StellarCAT]

That's what I figured! Didn't use the term - didn't remember it at the time 
but choker slings... wrap them so they 'grab' the legs equally and thus it 
should be vertical. The hook will freely swivel correct? So this hanging 
load can be turned by the guy putting the bolts in - right? Its been a while 
since I last did it ...


g.



-----Original Message----- 
From: Grant Saviers
Sent: Wednesday, October 12, 2016 11:36 AM
To: Fred Keen ; StellarCAT
Cc: tower
Subject: Re: [TowerTalk] Lifting a pre-built section of tower using a 
crane - how to strap it off

A good catch re managing the bottom end of the 60' tower assembly being
hoisted.  I used a fork lift and sling at the bottom. A good crane op
can swing the boom to minimize the drag and load.   Also, rigging to the
top with three slings for this much tower will have it truly vertical
and much easier for the tower man to join the sections.  With 3 choker
slings on the legs there are very low loads on the rung welds.

Grant KZ1W

On 10/12/2016 8:19 AM, Fred Keen via TowerTalk wrote:
> As you lift the tower, it was a lot easier for us having three men to hold 
> the guy wires away from the tower as it was lifted.
> Have you given any thought to how you're going to move the bottom of tower 
> as the crane lifts it? We used a small front end loader bucket, there is 
> not a lot of weight involved but the bottom will drag the ground until the 
> point where the crane has the tower section off the ground.
> Fred  KC5YN
>
>      On Wednesday, October 12, 2016 9:19 AM, R Morris <robrk at nidhog.net> 
> wrote:
>
>   The crane guy will know how, and usually pick up at the 60% point. In 
> your case, 40 feet, and a choker around the whole tower.
>
> Sent from my iPhone
>
> On Oct 12, 2016, at 10:06, StellarCAT <rxdesign at ssvecnet.com> wrote:
>
> Ok,
>
> Another question: so I have this 60’ long section of R55 with a rotating 
> ring at the 48’ point which will have guys hanging down from it ... the 
> weight is probably around 850#. The tower is laying with the top closest 
> to where the crane will be set up (probably 50’ away from its nearest end) 
> and the tower going away from the crane.
>
> How do I ‘strap’ this for the crane to lift it?
>
> I’m concerned that the rungs are not strong enough – their welds – to 
> strap around them ... do I somehow wrap around the legs using three straps 
> all going up to the hook?
>
> Gary
> K9RX
>
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