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Re: OSHA 4-bolt column anchorage

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I think part of the reason for the requirement was that if 250# iron worker climbed on column with only two bolts and he/she was leaning in a direction perpendicular to the bolt axis the column may lean or bend in that direction.  With four bolts the column should not move and put the iron worker in harms way...................assuming there are nuts attached of course.
 
 
 
Joe Venuti
Johnson & Nielsen Associates
Palm Springs, CA