Hilti vs embedded anchors
Hilti vs embedded anchors
(OP)
Plan for steel barn on 24'x36' slab/piers calls for 5/8in hilti bolts (4in deep) at 10 anchor points. I called the engineer and asked why they specify hilti's vice embedded anchor bolts. He said mostly because of precision needed for placement. My sense is embedded anchors would be stronger. Can anyone relate the strengths?
If the strength difference is significant I would probably go with the embedded anchors since the barn is in a high wind area and I'm doing the excavation and forms myself.
If the strength difference is significant I would probably go with the embedded anchors since the barn is in a high wind area and I'm doing the excavation and forms myself.





RE: Hilti vs embedded anchors
Having said that, if the engineer has appropriately designed the anchors, he can do that successfully, even in high wind areas. Make sure he has considered the spacing of the bolts (the closer they are, the lower their pullout resistance), the embedment depth relative to the concrete thickness, the edge distances, and the probable failure mode of the anchors. All play into the design. Further, most building codes require that a safety factor of at least 4 be used for anchors and that shear-tension interaction be checked. If you have a lateral load (probable) then this parameter must be checked.
RE: Hilti vs embedded anchors
I plan to embed the 10 connector column anchors in wet concrete, using 10" long 5/8" anchors. Rather than try to get an exact placement on the other 16 anchors for the pour, go with the hilti's for the clips/support column plates. This should improve overall strength.
For the piers I plan to use sonotubes, since I'm digging with a backhoe. And a 2" deep tamped 3/4- gravel underlayment for the slab. Ground is hard clay (SOCAL).
RE: Hilti vs embedded anchors
RE: Hilti vs embedded anchors
My 2 cents would be to use what was specified. You will possibly cause yourself more erection problems with misaligned anchors than you would gain in strength.
Dick
RE: Hilti vs embedded anchors
RE: Hilti vs embedded anchors
Dick, you make a good point, it comes down to a tradeoff between placement precision and pullout strength. If I'm setting the forms, I feel like I can get the necessary precision on at least the 10 primary anchors to wet set them.
70-80mph winds are not uncommon during extreme SOCAL Santa Ana conditions, and I live on an unsheltered bluff in an area which generally experiences the highest wind speeds. Color me somewhat paranoid.
RE: Hilti vs embedded anchors
Here is the Hilti website http:
We have used the epoxy to hold in the anchor-bolts for some smaller natural gas field compressors, which withstands a fair amount of vibration. Not sure if the size and all match up to what you were thinking. Our anchor system is somewhat more elaborate than what you would want on a barn. However, I think you could epoxy in some nice ¾” studs with the epoxy system. Our experience is the epoxy with the correct embedment length will pull out the concrete before the epoxy fails. I would think that a well stocked rental store would have a good hammer drill you could rent.
However if you are placing wood sill plates over the anchor bolts, I’m not sure why you would need the precision. Maybe I am misunderstanding your application?
dwedel
Hotrod Big Engines!
RE: Hilti vs embedded anchors
Accuracy of anchors is critical as its a prefab steel barn. The barn outfit does the install, drills for the anchors, etc. I watched them put up similar barn down the street from me and its a good job but they seemed in an awful hurry.
RE: Hilti vs embedded anchors
Anyway, my 2 cents. Good Luck,
dwedel
Hotrod Big Engines!