×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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!
  • Students Click Here

*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

Jobs

Shoring CMU walls

Shoring CMU walls

Shoring CMU walls

(OP)
Hi,
I would like to know if needling is a good method of shoring CMU walls, or if there are any other proven methods?  Also, what is typically used for needling? I.e. tubes, wide flanges, pipes?  
I have a wall with a large (4 klf) and I am concerned that needling may not be sufficient to shore a load of that magnitude.  Any thoughts would be greatly appreciated.

RE: Shoring CMU walls

Needling is common for providing temporary support for CMU walls.  Your 4klf loading appears to be high.  Have you considered arching for the load?  If the load is of that magnitude, rather than needling, you may have to cut in a steel channel on one side to provide support and then install another one on the other side.  Alternatively, you may have to provide temporary support for the load and then provide needling.

Dik

RE: Shoring CMU walls

(OP)
dik,
Thanks for the quick reply.  I have considered arching but there isn't enough CMU above the opening to allow for arching action.  As for shoring the load, it is actually very complicated because of existing ductwork and other obstructions that limit that option.  
I do like the idea of cutting in a steel channel on one side like you suggested.  I will look it, otherwise I may not have a choice but to shore the load regardless of the inconvenience.
Thanks again for the helpful information.

RE: Shoring CMU walls

If there is load coming unto the wall from say a floor or roof, you might consider shoring those elements separately from the wall.

RE: Shoring CMU walls

can someone give an explanation of needling?

RE: Shoring CMU walls

Needling is the process of putting holes through a masonry wall and providing a support of it at the hole location.

The holes can be large 12"x16" and the 'needle beams' can be W12x26 for example.  Alternatively, the holes can be small, ie. 3/4" diameter and the 'needles' can be threaded rods.  Often dimensioned lumber to PSL material is used on either side of the wall with 3/4" dia threaded rod at 2' centres (for example only) are through bolted and clamped.  The ends of the PSL is supported by posts.  The masonry beneath the needle beam is then removed and a new steel/concrete/masonry lintel is put in place and the needle beam is removed.

Dik

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!


Resources