Epoxy Anchors - Help Needed please

[matt_i]

This is likely not safe to use:

"Limitations
THE NTSB HAS STATED THAT THIS PRODUCT IS APPROVED FOR SHORT TERM LOADS ONLY AND SHOULD NOT BE USED IN SUSTAINED TENSILE LOAD ADHESIVE ANCHORING APPLICATIONS WHERE ADHESIVE FAILURE COULD RESULT IN A PUBLIC SAFETY RISK. CONSULT A DESIGN PROFESSIONAL PRIOR TO USE.
- Not for use in overhead applications."

Most epoxies creep and don't do well under sustained tensile loads, like some of the anchor bolts on a two post lift may see. There are special "overhead use" formulations that should do the trick and I recall that most manufacturers will recommend specific products that can be used for their applications.

Good info, although I see the glass transition temp is 60C = 140F. Simpson Strong tie makes a SET-XP epoxy that's claimed horizontal and overhead apps. I haven't worked out the loading on a 2 poster anchor bolts but my guess is its pretty conservative if there are multiple 3/4" anchors set deep. That's a lot of shear area....

 

[rburke65]

I wonder what the Mfg. of the lift originally recommended from mounting hardware in thir instructions. You have to read the instructions....."Blow out the holes".... And use the proper hardware. Doesn't the lift mfg. usually recommend a 'wedge' type of anchor and not 'all thread' rod? And are you going to buy Lowes and / or Home Depot allthread made of Chinese steel? And reluctant to buy a quality anchor bolt on which your life may depend? Ya have to read thedirectionsand yes this is going to cost some money to do it right. And as always, just my opinion.

 

[wssix99]

Or, is there some uplift when the car is being lowered or raised? 3000lb? Tensile only?

Yea, on a two post, there is constant tension on the outer bolts as the posts feel an inward bending with the load on them. The forward or rear bolts can also be in tension if the load is unbalanced for-to-aft.

Without knowing loads, one is just guessing about adequacy. It doesn't seem there is a sustained tensile load so creep should not be an issue, but I may be wrong.

I would check lift manufacturer for loads and anchorage recommendations.

This is great advice. The manufacturers should have options or tests to back this up.

The manufacturer/engineers may not consider a car up on a lift for a few hours "sustained," or they might. If one stored a car on a lift overnight, I would think that would be "sustained." (I'd still err on the side of an overhead epoxy, though.)

 

[hockey930]

Does anyone have access to any single Hilti HIS series anchors? I am looking to buy 1.

 

[mk3cn4]

Hi everyone, I am the OP from 6 years ago, just wanted to update per request from the thread resurector a few posts back LOL

The epoxy on the second set of bolts as described in my last post from 2012 has held up perfectly over the years. I use the lift several times a week and watch the bolts very closely and there is only 1 bolt that is super slowly working loose, the epoxied ones are rock solid and have continually held 100 ft. lbs. torque perfectly.

 

[Nexussian]

Hi everyone, I am the OP from 6 years ago, just wanted to update per request from the thread resurector a few posts back LOL

The epoxy on the second set of bolts as described in my last post from 2012 has held up perfectly over the years. I use the lift several times a week and watch the bolts very closely and there is only 1 bolt that is super slowly working loose, the epoxied ones are rock solid and have continually held 100 ft. lbs. torque perfectly.

Thank you so much for the update.

 

[TheEquineFencer]

Hi everyone, I am the OP from 6 years ago, just wanted to update per request from the thread resurector a few posts back LOL

The epoxy on the second set of bolts as described in my last post from 2012 has held up perfectly over the years. I use the lift several times a week and watch the bolts very closely and there is only 1 bolt that is super slowly working loose, the epoxied ones are rock solid and have continually held 100 ft. lbs. torque perfectly.

What epoxy did you end up using?

 

[James168]

Hi everyone, I am the OP from 6 years ago, just wanted to update per request from the thread resurector a few posts back LOL

The epoxy on the second set of bolts as described in my last post from 2012 has held up perfectly over the years. I use the lift several times a week and watch the bolts very closely and there is only 1 bolt that is super slowly working loose, the epoxied ones are rock solid and have continually held 100 ft. lbs. torque perfectly.

Hello I’m javing the same problem. A few of my wedge anchors are falling and starting to pull out. I want to try some epoxy. Which epoxy brand did you use, which size drill bit and bolt did you use?

Thanks

 

[TheEquineFencer]

Hello I’m javing the same problem. A few of my wedge anchors are falling and starting to pull out. I want to try some epoxy. Which epoxy brand did you use, which size drill bit and bolt did you use?

Thanks

Send the OP a pm and post the reply please.