Concrete Inserts with Low Pullout Ratings?

5/13/2019

We're located in a seismic area where PT decks are to be considered cracked concrete for the purpose of hanging and bracing. We see a lot of the Dewalt Mini Undercuts and now the newer Hilti HDP-TZ inserts being used to hang up to 4" pipe from the concrete decks. The data sheets show them with pullouts of under 240lbs.

How can these be used to hang ANY sprinkler pipe if the minimum required capacity of the hanger assembly is the weight of the water filled pipe plus 250lbs?

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5 Comments

MARC-ANTOINE NEPTON

5/13/2019 10:33:24 am

Hey ! How are you ?

For the hanger part, look at product that are approved for FM-1951 1952 (I suggere that read that FM test, if it meets NFPA requirements).

I think that for the seismic part, the anchor shall meet NFPA 13 and shall be accredidate for ACI 355.2.

let me know !

PETE

5/13/2019 02:50:17 pm

You are correct. You can't use them. For the hangers, there's a Sammy swivel SH-CCST-516, which is a concrete screw 5/16-14 x 2 1/2"... 857lb pullout for cracked concrete and seismic zones A-F, but it's not FM approved. They're expensive, but they save on labor b/c no pre-drilling.
For seismic bracing you need to use the Hilti Kwik Bolt TZ expansion anchor. The 1/2 diameter gets embedded only 2", and has the lowest pullout force of 2,205 lbf. in tension.

PETE

5/13/2019 02:52:09 pm

Correction- the sammys require a pilot hole, but still easier than setting an anchor. Sorry, it's been a while since I used them.

Mike

5/14/2019 03:12:05 am

Drilling in PT slabs is not a good idea. The tendons could be cut and many time the structural engineer will not allow it.

I've only used inserts in these types of slabs. I create an insert plan including sleeves.

Mike

5/14/2019 03:16:30 am

Sammy CST 20 for 3/8" rod is FM approved at 1,475#

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Concrete Inserts with Low Pullout Ratings?

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