×
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

Anchors to Existing Masonry

Anchors to Existing Masonry

Anchors to Existing Masonry

(OP)
On one of our jobs, we had called out epoxy anchors into existing masonry. The contractor went ahead and used expansion anchors instead. The loads are very small, about 100# at each anchor. It is a short open corridor canopy w/ existing masonry on either side.

Do expansion anchors work in masonry/CMU?

The connection is on the face of masonry.

RE: Anchors to Existing Masonry

Depends on the anchor. Need to get the manufacturer and model. If it doesn't work don't hesitate to make them change them out for the correct anchors.

RE: Anchors to Existing Masonry

If they are installed into grouted cells, yes they do. However, Hilti limits installation of expansion anchors to 1 per cell. See Hilti catalog, section 4.3.5 (p. 344 in 2008 edition)

RE: Anchors to Existing Masonry

(OP)
Thank you guys.

I was looking at the Hilti Anchor Selection Guide (pages 52-56) in 2011 catalog and it seems expansion anchors cannot be used in masonry. I just trying to be sure.

RE: Anchors to Existing Masonry

ron has it right.

Most are not acceptable - even into brick.

You can only use ones that have been tested for the specific application.

I thought Hilti or Powers had a couple that could be used....but their tension loads are relatively low.

Check carefully..

RE: Anchors to Existing Masonry

I'm almost positive that at least the Hilti Kwick bolt III can be used in grouted masonry. I don't have the product manual with me though.

EIT

RE: Anchors to Existing Masonry

I would never use an expansion anchor in the top of a concrete or masonry wall, or within a foot of the end of a concrete or masonry wall, or an opening in the wall.  There is just too much danger of spalling, with subsequent anchor failure.  You need a certain amount of confining concrete around the anchor for it to work properly.   

Mike McCann
MMC Engineering

 

RE: Anchors to Existing Masonry

The OP said the anchor was on the face of the masonry, and the load is only 100 pounds.  There are lots of mechanical anchors which will work in that case.

RE: Anchors to Existing Masonry

Loads are relatively small... and almost any reasonably installed anchor will work... Tapcons included.  As noted, check with the manufacturer.

Dik

RE: Anchors to Existing Masonry

Not sure of the canopy configuration, but 100 lbs. seems low.  You at least have a 90 mph wind load anywhere in the US (assuming you are in the US).  Nevertheless, as others have noted, there are plenty of anchors that will work.

RE: Anchors to Existing Masonry

I was aware of that Hokie.  Just adding to the mix.

Mike McCann
MMC Engineering

 

RE: Anchors to Existing Masonry

what about seismic load?   

RE: Anchors to Existing Masonry

FYI: As msquared48 alluded to, the method of obtaining the hole for the anchor is critical; hammerdrills will cause spalling on the inside face of ungrouted CMU cells that will not be evident.

engphila

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