Anchor Bolts for Hoist

[MR P BODY]

I have a 9000# twin post(side by side) that mounts on the concrete, it
uses 4 (could be 8) 3/4" bolts..... what would be the depth for the anchors
to be safe.... I have 1/2" pex near the bottom of my 6" slab. I didnt put the
pex where I thought the hoist was going to be BUT I changed hoist and this
one uses a bigger mounting plate..... any help is appreciated

 

[pipehack]

You can use a HILTI "drop in anchor" They are made from 1/4" up to 1" (i believe) You would only have to drill the depth of the anchor and use a set tool to secure it. most construction supply houses should sell it. They are strong as hell. I'm sure someone will disagree .

 

[GeorgiaHybrid]

There are several Hilti's and others that you can use. The drop in anchor from Hilti is one, as is the parabolt (epoxy anchor) you can also use wedge-it type anchors from several vendors. As to depth, I would very hesitant to use less than a 4" embedment on them. Call a local bolt supply company and they can fill you in on the options that they have and give you the tensile capacity of the anchor system.

You don't need the shear value as the bolts are subject to a moment load putting them in tension (from the post wanting to meet in the middle when you lift the vehicle). Make sure that the bolts you buy give you a nice "comfort" margin compared to the requirements given by the lift company. They have the correct number (and a very large safety factor) but it is MY (in this case, your) **** under the lift...

 

[benjamming]

Hilti makes their stuff in the US, correct?

 

[GeorgiaHybrid]

ben,

You can spec domestic bolts when you buy and they will furnish them. I don't know if all of their bolts are made here or if some production is offshore. With Hilti being worldwide, I doubt that all of their products are domestic US production.

I will say that I hope I am wrong on that....

 

[pipehack]

I know the anchors are .

 

[MR P BODY]

Thank guys..... I think I'll drill in the Hilti style to about 3 1/2"... I dont want to
get near my pex

 

[pipehack]

Hey... I checked out some of the Hilti anchors at work today and the box read " made in Taiwan" Sorry.. I thought they were still made in the U.S.

 

[Vernmotor]

Are you learning anything over here Mike ??

 

[e3pres]

You could get an estimate of the uplift force in the tension anchors by multiplying 1/2 the hoist rating (since half goes to each side) by the distance from the pads to the center of the post, then dividing by the lateral spacing of the bolts. This will be the total uplift load. Divide that by two (for a four bolt arrangement), and you'll have the max uplift for a single anchor. You can then compare that to the manufacturer's load data. I've made some assumptions since I haven't seen your exact setup, but that should get you pretty close.

BTW - I usually spec out Hilti Quik-Bolt III's, but any fastener with a sufficient load rating should work.

 

[krooser]

I used Wedj-its when I set up my 9K Weaver... 1"... still standing after 10 years.