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wedge anchors for auto lift

jmorgan1221

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Oct 7, 2018
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ohio
looking for some advise on wedge anchors. i am installing an atlas 9000 pound 2 post lift. the included wedge concrete anchors are 3/4" by 5-1/2" long. after torquing the bolts to 150 ft/lb, the bolts range from 2-1/2 to 3" above the concrete. most are at 2-1/2 give or take a 1/8". how far should the anchors pull up until it effects the holding power? the concrete is at least 5" thick. thanks.
 
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mlyonsdc

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Nov 23, 2018
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USA
I have the same lift I recently installed Atlas 9KBP. On mine the TQ was supposed to only be 85#. Page 10 #4 at top of the page.
https://www.google.com/url?sa=t&rct..._XH-9KBP.pdf&usg=AOvVaw2sL5SK0ORmuU9M65VbBc81


I don't think you want them pulling to high you won't have enough thread to tighten the lift base plate without a ton of washers on top. From what I am told you absolutely will not get them back out of the concrete either.

I have had to re-torque mine several times to keep them at 85# over the last month. They seem to be holding the correct TQ at this point.
 
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jmorgan1221

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Oct 7, 2018
Messages
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Location
ohio
I have the same lift I recently installed Atlas 9KBP. On mine the TQ was supposed to only be 85#. Page 10 #4 at top of the page.
https://www.google.com/url?sa=t&rct..._XH-9KBP.pdf&usg=AOvVaw2sL5SK0ORmuU9M65VbBc81


I don't think you want them pulling to high you won't have enough thread to tighten the lift base plate without a ton of washers on top. From what I am told you absolutely will not get them back out of the concrete either.

I have had to re-torque mine several times to keep them at 85# over the last month. They seem to be holding the correct TQ at this point.

per the instructions on my particular lift, it states to torque them to 150 ft/lb.
 

JeepJohn62

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Feb 25, 2019
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per the instructions on my particular lift, it states to torque them to 150 ft/lb.
I installed the 10K version last year. I believe there is a spec for the maximum bolt height which indicates how much concrete is retaining the bolt. Ideally you want the max depth possible for the most strength.

Is it possible to pound the anchors deeper and then re-torque for better concrete engagement?

As you said, the 80 ft-lb torque and the 150 ft-lb is confusing. Does the bolt "climb" in the hole considerably beyond 80 ft-lb?

Best wishes and stay safe,
John

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u2slow

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Nov 20, 2011
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BC
I have the same lift I recently installed Atlas 9KBP. On mine the TQ was supposed to only be 85#. Page 10 #4 at top of the page.
https://www.google.com/url?sa=t&rct..._XH-9KBP.pdf&usg=AOvVaw2sL5SK0ORmuU9M65VbBc81

^ That manual says:

1. Concrete shall have compression strength of at least 3,000 PSI and a
minimum thickness of 4” in order to achieve a minimum anchor embedment
of 3 1/4”. NOTE: When using the standard supplied 3/4” x 5 1/2 long
anchors; if the top of the anchor exceeds 2 1/4” above the floor grade, you
DO NOT have enough embedment.
 

mlyonsdc

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I went and looked and the "pro" overhead does say 150# of TQ for the bolts which seems odd as I have the same size anchors.

How deep did you drill the holes did you go all the way through the concrete?
 
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jmorgan1221

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Oct 7, 2018
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ohio
i hit one of the anchors back down and it did tighten up lower to the surface of the concrete. i cant find anywhere if this is ok to do. are the anchors able to be tapped back down if they were already set once before in the concrete? thanks for the clarification on the other manuals, the manual for my lift left alot to be desired. as for the last reply, i drilled all the way through the concrete.
 

JeepJohn62

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i hit one of the anchors back down and it did tighten up lower to the surface of the concrete. i cant find anywhere if this is ok to do. are the anchors able to be tapped back down if they were already set once before in the concrete? thanks for the clarification on the other manuals, the manual for my lift left alot to be desired. as for the last reply, i drilled all the way through the concrete.
The concrete hole is not exactly uniform due to the nature of aggregate and concrete. I think that if you are able to find a deeper embedment and the wedge finds a solid grasp to expand, then you have achieved the proper strength. Check the torque on a regular basis per the manual to verify all anchors are firm.

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jmorgan1221

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Oct 7, 2018
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ohio
i was able to drive the anchors a little deeper than i did the first time. they did torque to 150 ft-lb quicker this time. they have enough embedment now, but i still worry that they will lose there grip being as they were already set once. i will give it a try and see if they loosen up any.
 

JeepJohn62

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Feb 25, 2019
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i was able to drive the anchors a little deeper than i did the first time. they did torque to 150 ft-lb quicker this time. they have enough embedment now, but i still worry that they will lose there grip being as they were already set once. i will give it a try and see if they loosen up any.
You could call a manufacturer like Hilti and ask about this. They should be able to provide a professional answer.
I think that if you get the wedge expanded and torqued, that it will not slip in the hole. Best wishes my friend.

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finn

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Location
The UP, God's country
Just recheck torque after cycling the lift. It will probably creep a little, but significant torque loss tells you they are getting loose with use.

I wouldn’t expect a problem, though.
 
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