Lift anchoring questions

[rattle_snake]

I prepped my new building for a the installation of a 2 post lift. I now have the opportunity to use a friends lift that he just acquired, for at least a few years until he builds his own shop.

The lift is a Atlas BP 8000. I was going to get a Bendpak XPR-10S. The Atlas is not enough, on paper, to lift my truck, so I still plan to purchase a 10k lift down the road.

My slab is 4" 3k psi, except for where the lift was originally going to be placed. I increased depth to 6" in a 4' x 6' area around where each post would go.

I am hesitant to install the Atlas in the original target location, as the hole patterns are different. I don't think I should drill additional holes for the bendpak in close proximity to the existing ones from the Atlas.

OR maybe I can, what do you think?
How close can I drill next to an empty/abandoned hole?
I understand that the baseplates themselves have multiple anchors close to one another, and can de-rate some anchors specifications.

Option B is placing the Atlas within, but near the edge of the 6" deep area. That would give me about 15" between the rows of anchors (columns centers 27" apart)

WWGJD?


Extended rambling:
Also to note is that the Bendpak in wide configuration is 21" wider than the Atlas. This leaves the outer anchors (the REALLY important ones) at least 10" away from any existing holes, even if installed in-line with one another .

 

[rattle_snake]

Also, what type/brand/length anchors?
would a Redhead wedge style 3/4 x 5-1/2" be sufficient? 4" deep hole? (11-3/8" bolt to bolt spacing)

Since I plan to remove, I would also value a removable anchor instead of cutting off the exposed stud later. I understand I can drill all the way through for a wedge type.

Something like a Titen HD? These have higher tension/closer spacing ratings than wedge.
https://www.strongtie.com/mechanicalanchors_mechanicalanchoringproducts/thd_anchor/p/titen-hd

Or sleeve style that can have bolt removed?
https://www.strongtie.com/mechanicalanchors_mechanicalanchoringproducts/diab_anchors/p/drop-in-diab

Suggestions?

 

[sberry]

Its not a problem, pour rock the old holes and make new ones, 3 inches from old or more should be fine.

 

[lakeroadster]

If I were you, I would address your question to Bendpak, since ultimately that is the lift you want.

I think it is a bad idea to have a double bolt pattern drilled into the concrete..

 

[matt_i]

I'd say in a 6" deep slab I'd not want to drill another hole within a 6" diameter of existing if you intend to use wedge anchors.

I would personally use a drop in anchor to hold up a piece of 1/2" EMT.

If you epoxy studs, I'd put another hole within 3" of previously drilled.

 

[wssix99]

This seems like a lot of grief and work for something that's "free" that will probably be taken away from you - and it's not what you really want anyway. Then you'll have to go do the work of putting in what you really want. (After dealing with the mess that the borrowed lift pegs have left in your floor.) The borrowed lift will also probably get scratched and you'll piss off your friend, doing irreparable damage to your relationship.

Personally, you wouldn't catch me dead under an Atlas lift. ... or, maybe you would.

The course of action seems pretty obvious on this one. Do we need to call your wife?

 

[rattle_snake]

Looks like spacing is dependent on anchor type, and is also impacted by the baseplate bolt spacing. The 3 types of anchors I listed above all need more bolt to bolt spacing (around 12") that the plate allows, so all the anchors are de-rated by some amount.

For instance, Atlas outer bolt spacing is 6.2", so this de-rates the anchors from 10k tension to approximately half that.

That said, providing a full 12" spacing to other holes is ideal, however anything over 6.2 isn't going to help, as it's already de-rated.

So going with plan b, which does allow 12" between any 2 anchors of the 2 lift locations. Probably going with the Titen HDs

The opportunity to use this lift is well worth the time and money to install. Even one job with it justifies it, and it frees up $ to do other things, like insulation/drywall.

 

[Falcon67]

IIRC, the manual on my new Weaver says no holes within 6". It's a 9K and uses 3/4" wedge anchors.

 

[rattle_snake]

Its alive! I ended up using 3/4 x 5-1/2 wedge anchors. They went in fine although I needed a few beers to calm my nerves after some previous experiences....
This lift was modified/narrowed specifically for VW bugs, to allow doors to be opened. I returned it to its full width.

 

[sberry]

Nice. When you move can pound the bolts almost thru if drilled for it and pour rock the hole full. There guys are probably right, 6 inches for a hole that size.

 

[Scud67]

"Personally, you wouldn't catch me dead under an Atlas lift. ... or, maybe you would."

This is just an ignorant statement. There is absolutely nothing wrong with Atlas lifts. They have been selling them for a very long time and I have yet to hear of one that has failed.

Atlas may not be your choice, but don't bash a product just because it is less expensive than the one you decided to buy. They work just fine...

 

[Falcon67]

LOL, about the same as my Weaver floor plate model except for the color. The concrete under at least most of my anchors should be 12~14" thanks to the 12x12 grade beam I put down the middle of the foundation.

 

[wssix99]

"Personally, you wouldn't catch me dead under an Atlas lift. ... or, maybe you would."

This is just an ignorant statement. There is absolutely nothing wrong with Atlas lifts. They have been selling them for a very long time and I have yet to hear of one that has failed.

Atlas may not be your choice, but don't bash a product just because it is less expensive than the one you decided to buy. They work just fine...

I never said there was anything wrong with Atlas lifts. I just said wouldn't catch me under one and I said that in the context of the OP desiring a superior Bend-Pak unit.

So my statement, being my personal opinion is truthful and can't be ignorant. My opinion based on physics and design. Enough has been said on this site regarding these lifts, marketing tactics, etc. on other threads, so I don't think any of us need to re-hash that here.

For properly maintained home use, I'm sure the Atlas structure is fine. I would definitely advise anyone standing under one to opt for their baseplate extension kit for an added margin of safety, though.