It is amazing how complicated things get on towertalk. I installed Rohn
65g (some were double braced sections) complete with ring rotators and a
massive torque assembly using a crane on multiple occasions. The rings and
other objects bolted to the tower have no effect on picking it up. There
is no reason to drag the legs though the soil unless you want to. For
those that do not know, K8LX is in the tower business so I would recommend
that you give a lot of weight to his posts.
GL
John KK9A
To: towertalk <towertalk@contesting.com>
Subject: Re: [TowerTalk] Legs of a 60' piece of tower being dragged while
being lifted
From: Steve Maki <lists@oakcom.org>
Date: Mon, 17 Oct 2016 22:55:07 -0400
Hmm. All I can say is we install much larger pieces of assembled tower
than R55 (and 50' pieces of monopole weighing many thousands of pounds for
that matter), and crane operators seem to have no problem picking the
tower from the top end and standing it up straight without dragging it. It
seems to be second nature with these guys.
I can't quite visualize how rings complicate things that much if you have
the base on the ground and the tower tipped up on a support 2/3 or so up
the tower.
-Steve K8LX
On 10/17/2016 22:39 PM, Grant Saviers wrote:
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@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
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|