[TowerTalk] Legs of a 60' piece of tower being dragged while being lifted

[StellarCAT]

Hi Grant,

Indeed it was about one ring - and that ring is near the top (48' level of a 
60' stick) ...and determining the COG isn't that difficult at all using sum 
of moments. It should be pretty straight forward. Assuming he booms out as 
he lifts to keep it on a radius, which is the key, there will always be a 
force at the end pushing it down in to the ground so again assuming he booms 
out as he lifts on a radius it should stay planted. Not that difficult I'd 
guess for an experienced operator. I've seen them place something within an 
inch of where you need it at a distance of 100' from where they sit ... that 
stated I will try to get something under the legs as it will more than 
likely get dragged at least a little.

Gary
K9RX


-----Original Message----- 
From: Grant Saviers
Sent: Monday, October 17, 2016 10:39 PM
To: Steve Maki ; towertalk
Subject: Re: [TowerTalk] Legs of a 60' piece of tower being dragged while 
being lifted

Since my largest tower went up with a commercial tower company who
builds 400' plus towers, and who required the base be managed, I would
say there are definite disagreements about this.   When lifting sections
with rings off supports, it can't be done safely and reliably, no matter
the skill of the crane op.  A plain stick of Rohn 25/45/55 is a
different animal.  Note the thread origin is about tower sections with
rings already mounted.

Grant KZ1W

On 10/17/2016 18:55 PM, Steve Maki wrote:
> On 10/17/2016 11:53 AM, john at kk9a.com wrote:
>
>> The weight is irrelevant.  A skilled crane operator can move the boom as
>> it is being lifted leaving the section on the ground as a pivot point.
>> Of  course if someone wishes to build a slide or use a loader to move
>> the base as it is being lifted that is perfectly fine, but I won't be
>> doing this.
>>
>> John KK9A
>
> I agree. A good operator has no problem at all with this scenario, as long 
> as the crane is sized properly and can be positioned properly.
>
> It's just a non-issue.
>
> -Steve K8LX
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>