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RE: Welding nut to anchor rod

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Title: Welding nut to anchor rod
When installing the top nut, clockwise rotation causes clockwise torgue in the rod, driving the rod downward through the bottom nut.  Even if the bond were broken, the rod would bottom out in the concrete.  It seems like the only advantage to tack welding or de-threading would be for removal of the top nut.  Is there a reason to plan for removal?  JPRiley

"Carter, Charlie" <carter(--nospam--at)aisc.org> wrote:
This recommendation is for the nut embedded in the concrete at the bottom of an anchor rod used in the threaded/nutted bottom configuration (not a headed rod). It is based upon field experience with installation of the nut at the top on such rod configurations. It is relatively easy to break the bond and spin the whole rod in the embedded nut. A simple tack weld of the nut to the projection of the rod below the nut will help prevent this, since it make the assembly function more like a headed rod when the top nut is installed.
 
Charlie
 
 

From: Greene, Al [PTS] [mailto:AGFO(--nospam--at)chevron.com]
Sent: Thursday, May 11, 2006 8:56 AM
To: seaint(--nospam--at)seaint.org
Subject: Welding nut to anchor rod
 
The following sentence is on Page 14-10, of the Steel Construction Manual, 13th edition, in a paragraph about anchor rods:  "The nut should be welded to the rod to prevent the rod from turning out when the top nut is tightened."
With respect to F1554-99 anchor bolts, does anyone know what the above statement is based on, i.e., theory, tests, opinion, what???
Thanks in advance.
Al Greene, PE, SECB
Chevron Richmond Refinery
841 Chevron Way, 244/Tech Center
Richmond, CA 94802
Phone: (510) 242-1788
Fax: (510) 242-2509
Pager: (510) 620-7315
agfo(--nospam--at)chevron.com


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