Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Steel beam to lift 12,000 pounds-size??

Steel beam to lift 12,000 pounds-size??

Steel beam to lift 12,000 pounds-size??

I have a leaning 6 ft wide chimney that weighs approxi- mately 12,000 pounds.  I would like to insert a steel beam of about 14 ft length under it, so that 4 ft stick out each side.  Then I will use two 10 ton jacks to lift the beam&chimney.  I plan to position the jacks 3 ft from the chimney.  I need to know what size/shape/material steel I-beam (or other shape?) to use that will support this weight over a 12 ft span with minimal deflection.  I wish achieve an even loading across the foundation to lessen the chance of cracking it, so minimal deflection is needed.
I do not know where to find this information, even though I did have "statics"  and "dynamics" in school. (I am an electrical engineer).  If someone could clue me in as to what I need, I will greatly appreciate it.  Also, I am interested in the learning the information source, so I will be better informed in the future.
I am fixing up an old farmhouse, so who knows what I might need down the road.  Thanks!

RE: Steel beam to lift 12,000 pounds-size??

Hi, pappa.

What you really need is an experienced structural engineer, who will fully assess your scheme.

We cannot tell you what damage you may do to your chimney when you try to take its full weight on two local points; you cannot achieve "equal loading" on any foundation if you load it at only two points; we cannot tell whether the foundation will do much more than simply "crack" - you could do quite cause serious damage to it, and end up with much worse problem than the existing lean; we cannot tell why your chimney is leaning at present - it could well be that your foundation is quite inadequate right now, and you are addressing a symptom rather than the real problem.

"Minimal deflection" is a meaningless design criterion.  For some purposes, span/150 may be quite OK, for others, one fifth of that might be needed.

As for references, all that you would need would be a couple of good steel design texts, several geotechnical texts, a lab report on the soil conditions under your foundation.  (And a couple of good concrete texts if it is a concrete chimney).  Plus some books on site construction operations, and several years of worthwhile experience in the field.

As far as your basic site operation is concerned - if you try to lift a chimney with only two jacks, it will almost certainly fall over perpendicular to your proposed lifting beam unless it is also guyed in both directions, and the guys are extended as you lift.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close