Anchoring Precast column
Anchoring Precast column
(OP)
Working on a small precast monument, and trying to figure out how to anchor the columns into the foundation. They are architectural, so they dont want weld plates, etc exposed.
I started with a grout sleeve, have rebar out of the footing into the column that has the grout sleeve
Also thought about a base plate with voids, recessed down into the foundation, grouted over later
Contractor is wanting to leave a void in footing, and have bars out the bottom of column into foundation. Say a 14" dia void, and drop column and bars down into it, and grout.
Not sure I like that, would just be relying on bond strength to anchor it. How do you leave a void, but keep it rough for interlock?
Any other suggestions?
Not a major amount of uplift, but also will be a cantilevered column for stability.
I started with a grout sleeve, have rebar out of the footing into the column that has the grout sleeve
Also thought about a base plate with voids, recessed down into the foundation, grouted over later
Contractor is wanting to leave a void in footing, and have bars out the bottom of column into foundation. Say a 14" dia void, and drop column and bars down into it, and grout.
Not sure I like that, would just be relying on bond strength to anchor it. How do you leave a void, but keep it rough for interlock?
Any other suggestions?
Not a major amount of uplift, but also will be a cantilevered column for stability.






RE: Anchoring Precast column
This. Potentially even without the dowels. I'm pretty sure I've seen it in a European precast doc. Will search over the weekend...
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Anchoring Precast column
A more positive connection is weld plates which are in a recess in the foundation and then get grouted over to hide them, but it sounds like drilled and epoxied rebar should be sufficient for your project.
Professional Engineer (ME, NH, MA) Structural Engineer (IL)
American Concrete Industries
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RE: Anchoring Precast column
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RE: Anchoring Precast column
Teh, its 12' square structure, 4-14" round columns at corners. 12' tall with statue on top. Using a cantilevered system for stability, and then a slab on top.
I like the idea of epoxy, they can field core them, less depth, and get them in the right spots.
RE: Anchoring Precast column
I am just the precast engineer. the foundation is by others, we just need to agree on the pocket, anchoring of the column.
Perhaps a extension of the column below the final grade, and socket it in to the hole, and then pour final slab to grade.
RE: Anchoring Precast column
My approach would be precluded. I was envisioning a much deeper recess.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Anchoring Precast column
RE: Anchoring Precast column
Grouted dowel base connections are pretty routine, but you will have a hole that will need to be patched to fill the duct.
RE: Anchoring Precast column
One that I did with anchor rods, the anchor rods were recessed and the recesses were grouted in after the columns were installed. They were grouted in before the T's were added.
Dik
RE: Anchoring Precast column
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Anchoring Precast column
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Anchoring Precast column