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

[Grant Saviers]

For chokers from single loop slings, you are making a noose on the leg 
below the rung, and long enough slings so the tension is ok in them and 
not too much compression force on the legs.  8' slings?

Not sure how your crane will be configured, maybe a multi sheave hook 
for a 70T crane? Assume it will swivel since the wire ropes won't very 
much.  With long slings there is probably enough motion in them.  Ask 
how the crane will be rigged.

Grant KZ1W

On 10/12/2016 10:51 AM, StellarCAT wrote:
> 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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