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Anchor rod thread length

Anchor rod thread length

Anchor rod thread length

(OP)
Hi everyone. We have run into a problem on a job site. The contractor set the anchor bolts too far into the pier that there is not enough thread on the rod to fully adhere the bolt. I remember seeing a system (I though was Hilti) that can accommodate this site discrepancy.

Any thoughts?

RE: Anchor rod thread length

AISC has a free resource that may be of assistance https://www.aisc.org/content.aspx?id=2168

If you need to make the threads or length longer, you can use a coupling and another threaded piece to increase the length. You may need to add fabricated spacer plates to allow for the increased diameter due to the coupling.

RE: Anchor rod thread length

Depending on the situation you could weld the nut to the bolt if you are getting partial but not full engagement of the nut.

This is dependent on a few things, shear or tension or both on the bolt, how much partial engagement are you getting, is the anchor bolt of weldable material, to name a few.

RE: Anchor rod thread length

I recently sat in on an ASCE seminar which showed an example of calculating the pull-out strength of an anchor with a partially threaded nut. Check out "Fastener Design Manual" by Richard T. Barrett if you are able. I can dig up the slides showing the example if you'd like.

RE: Anchor rod thread length

From AISC's 'Field Fixes' document dated 2006 by Fisher and Kloiber:





RE: Anchor rod thread length

What you need is the Elocone nut by CANAM Steel. This is an elongated nut specially made for this very purpose. They fit anchor rod diameters ranging from 3/4" to 2 1/2". Google "Elocone Nuts".

RE: Anchor rod thread length

(OP)
Thanks everyone - very helpful. And Hokie - that is the nut I was referring to! Thanks for the refresher.

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