Epoxied Dowels and Plug Welds
Epoxied Dowels and Plug Welds
(OP)
I have a situation where I need to anchor something at the edge of a slab and space is at a premium...
I was thinking of placing dowels into the vertical face of the slab (about 10" thick) with epoxy, placing a plate with holes over the dowels and plug welding the plate to the dowels. I'm limited in the space I have at the slab edge to the point where I only have the room to put a 3/4" plate (no room to bolt the plate). I can extend my plate along the length of the slab to get the number of anchors to suit the loading.
This isn't so much a question, just wondering if anyone can see anything wrong with this idea, or has any success/failure experience with this.
I plan on contacting Hilti and asking about the affect the heat of welding will have on the epoxy.
Like I said, I have flexibility with the anchors so there is no specific load I'm working with yet...but it is in the range of about 5000 lbs tension/shear.
I was thinking of placing dowels into the vertical face of the slab (about 10" thick) with epoxy, placing a plate with holes over the dowels and plug welding the plate to the dowels. I'm limited in the space I have at the slab edge to the point where I only have the room to put a 3/4" plate (no room to bolt the plate). I can extend my plate along the length of the slab to get the number of anchors to suit the loading.
This isn't so much a question, just wondering if anyone can see anything wrong with this idea, or has any success/failure experience with this.
I plan on contacting Hilti and asking about the affect the heat of welding will have on the epoxy.
Like I said, I have flexibility with the anchors so there is no specific load I'm working with yet...but it is in the range of about 5000 lbs tension/shear.






RE: Epoxied Dowels and Plug Welds
Plug welds are for shear only, not tension.
www.FerrellEngineering.com
Providing fabrication and erection efficient structural design of connections. Consulting services for structural welding and bolting.
RE: Epoxied Dowels and Plug Welds
I appreciate the quick response.
RE: Epoxied Dowels and Plug Welds
www.FerrellEngineering.com
Providing fabrication and erection efficient structural design of connections. Consulting services for structural welding and bolting.
RE: Epoxied Dowels and Plug Welds
As for the weld, bevel the dowel and use a partial penetration weld.
RE: Epoxied Dowels and Plug Welds
RE: Epoxied Dowels and Plug Welds
RE: Epoxied Dowels and Plug Welds
ron: I may have to use that option. The thought had crossed my mind, but I thought inserting the dowels first then cutting the holes in the plate would be easeir on the contractor incase they start hitting a lot of rebar. They may just have to drill holes then fabricate the plates accordingly.
hokie: countersunk bolts may also be an option...I hadn't thought of that. They may end up being fairly long so I'll have to check availability, but it is an option.
Thanks all for the input!
RE: Epoxied Dowels and Plug Welds
I like hokie66's idea of countersunk bolts....those can be obtained in any size and you have the added benefit of better adhesion to the epoxy. They will have to be pushed against the slab to maintain plate contact as you cannot tighten after installation.
An installation suggestion if you select this route:
Put duct tape over the drilled holes after proper cleaning. Puncture the tape only enough to inject the epoxy into the clean, drilled hole, completely filling the void. Put the plate in place and then drive the bolts through the tape forcing excess epoxy out of the hole. This wastes epoxy but assures epoxy all around the bolt.
RE: Epoxied Dowels and Plug Welds
If they weld the dowels on the plate and then insert into epoxy, I don't like the fact that they won't be able to see anything after the installation. Getting a tight fit might be an issue as well with the excess epoxy spreading out between the backside of the plate and the edge of slab.
I think I might go with the countersunk bolts and pass on your installation suggestion...
Thanks again.
RE: Epoxied Dowels and Plug Welds
RE: Epoxied Dowels and Plug Welds
RE: Epoxied Dowels and Plug Welds
RE: Epoxied Dowels and Plug Welds
TXStructural: This is new construction so there is plenty of room now, but nuts and bolts will get in the way of the brick/brick shelf, or so I'm told. This is one of those jobs where I have been suggesting the best route and there is always some reason why it doesn't work. This is basically my last option. Thanks for the reply.
RE: Epoxied Dowels and Plug Welds
http://www.williamsform.com/Concrete_Anchors/Reusa...