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Designing a frame to stiffen skirt during lifting

Designing a frame to stiffen skirt during lifting

Designing a frame to stiffen skirt during lifting

(OP)
I've designed the lifting and tailing lugs for a very tall tower, and have determined that at picking, the skirt is likely to go oval without internal support (the designer obviously wasn't thinking about how to pick this thing up when designing the skirt and base ring).

Unfortunately, we cannot change the skirt or base ring, so the lead engineer wants to use an internal frame for support.  I'd like to know what the logistics of such a setup are, mainly, how is a frame attached to the inside of the skirt?

I've got a description in Moss 3rd edition, but I'm leery of the typos usually present in the book.  We could size beams until we're blue in the face but we don't know how they are commonly attached.

As always, any help is greatly appreciated.

Regards,
KLee

RE: Designing a frame to stiffen skirt during lifting

Design a beam to go from one side to the other and attach to the skirt anchor bolts, or design another base ring that can take the load and bolt it up to the existing skirt bolt pattern.

RE: Designing a frame to stiffen skirt during lifting

You can design something to attach to the skirt anchor bolts to stiffen the skirt, but that becomes problematic when you are trying to erect the column.  You can do the same thing that we often do with large diamter piping or shells that have to be moved around, weld in an internal frame and cut it out later.  Sounds like the company you are working with needs a new designer or at least a swift kick in the pants.

Brian
www.mcabeeconstruction.com

Opinions expressed are my own and are not those of the company.

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