MaxJax epoxy anchor question

[rday78]

Ok.... decided to go the epoxy anchor route for the maxjax. Drilled my holes into 5" concrete slab. When I went all the way through I noticed there is a couple inch void under the slab at that spot. Any ideas on how to install the anchors and keep the epoxy from running into the void? Thanks

 

[isaac338]

Why not just use the wedge anchors?

 

[dmeadow]

I rolled up some hardware cloth and shoved it down. Probably just a rolled up piece of cardboard would do the job.

 

[rday78]

I am using epoxy because they seem to have less problems than the wedges that come with the lift. That and they have a higher tensile strength

 

[sands35]

If there is a void you might want to think about taking up the concrete in that area and redoing that section. At least look for voids in the other holes.

 

[rday78]

I put a couple bags of sand in the void but not sure thats gunna do anything to help me. Dont want to pull up the concrete. Got nice thickness on the slab and want to get this bad boy in!!

 

[tomsmith]

+1 on the rolled up cardboard idea. Someone else mentiond using coffee filters in another thread.

Stay away from foam though, apparently it doesn't react well with the epoxy.

 

[OldNeons]

You definitely need to get with the manufacturer of your epoxy system before installing. I use Hilti system and they make wire mesh screens that you insert into the hole for situations like this. I would not trust my lift to "stuff some cardboard".... Epoxy systems are very strong and effective WHEN INSTALL DIRECTONS ARE FOLLOWED EXACTLY!

 

[rday78]

Turns out I was really overthinking it. The epoxy pretty much stays in place because its pretty thick... Put a wad of plastic in the hole... filled it up and spun the anchor in. At the end it pushes the bag down but the epoxy has already saturated the anchor. Everything went well

 

[sidwin]

I took a second look at the anchors and you're right it won't work...bad suggestion

has anyone noticed that epoxy anchors require 6.5 inches to depth?

and they are also out of stock and discontinued from wej-it.

I had 3 spin on me and i removed them and then put new ones back down and this time i coated the outside of them with epoxy and then some in the hole. hopefully they will hold. i'm worried they won't. one post all 5 went down fine and one post only 2.

thanks,
Sid

 

[NewShockerGuy]

I am redoing a few of the wedge anchors that seem to be not gripping. Replacing them with the epoxy anchors that so far the ones I've done years ago haven't budged.

I ordered several of these today: https://www.ebay.com/itm/Simpson-St...rentrq:8f8218d216d0aadad8a5965bfff845d6|iid:1

As noted above they are a mesh screen tube like thing. They come in different sizes. I ordered the 6". I will be putting them down the tube and then the epoxy anchor will at least nestle into it. Should be a much better solution than me jamming paper towels and coffee filters in the hole to fill the void. At least this will keep all the epoxy on the bolt and around it and not go where it won't be holding anything.

-Nigel

 

[Retroman]

Most important part of epoxy anchors is cleaning the hole. After it is drilled, blow out the hole with compressed air then run a nylon brush thru it 4 or 5 times then blow and brush and blow again. Do not use a metal brush not sure why but they are not allowed to be used. You need to pump a little epoxy out of the gun before you fill the hole to ensure proper mixing. Fill the hole about half full you want epoxy to come out of the hole once the rod is in. then spin the threaded rod in clockwise as you push it in. That is the procedure that is called out when we epoxy in rebar or anchors. Typically there will be a third party inspector to document the installation on a commercial job to ensure the procedures are correctly followed.
I would probably use a Titan concrete bolt or at least I would check there pull rating vs the epoxy. We use a lot of them for anchoring steel lintels over openings we have cut in block and concrete walls they are almost fool proof.

 

[finn]

Pick up a roll of cheap foam backer rod. Jamb it down the hole.

Will probably only cost a few bucks, too.

 

[Mr_fixit]

has anyone noticed that epoxy anchors require 6.5 inches to depth?

and they are also out of stock and discontinued from wej-it.

I had 3 spin on me and i removed them and then put new ones back down and this time i coated the outside of them with epoxy and then some in the hole. hopefully they will hold. i'm worried they won't. one post all 5 went down fine and one post only 2.

thanks,
Sid

you follow the directions?

 

[curiousB]

Just a thought. Spray expanding foam at bottom of hole? Once it dries redrill hole to just shy of thickness of slab to clean out the foam from sides of hole.