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RE: Anchor Bolt Straightening

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I would allow it, but check out the concrete afterward to see if there is
any damage.  (Ping the concrete with a hammer.  If it thuds, replace the
damaged concrete.)  Normally the concrete can tolerate some short term high
temperatures without degradation.  Remember also that beams used to be
cambered using heat cambering techniques.  Flame straightening locally bent
flanges is the order of business in a fabrication shop.

It is good to be cautious with heat straightening, but I would allow it on
A36 material. 

This is a good opportunity to put gage metal setting templates and double
nut requirements in your specification.  It forces the contractor to tie off
the assembly.


> -----Original Message-----
> From:	Tom.Hunt(--nospam--at) [SMTP:Tom.Hunt(--nospam--at)]
> Sent:	Tuesday, January 04, 2000 3:17 PM
> To:	SEAINT(--nospam--at)
> Subject:	Anchor Bolt Straightening
> I have some 1 1/2 inch diameter anchor bolts with a 10 inch projection
> that
> became skewed during concrete pouring.  They support a very large vertical
> pump.
> The field would like to straighten the bolts by heating and bending.  My
> first
> reaction was "no way" but then I remembered that we use to make L and J
> bolts by
> heating and there was a recent thread on beam straightening by heating.
> Any
> restrictions, cautions, or suggestions you can think of for heating and
> bending
> anchor bolts?  What would be the optimum temperature?  I assume the
> maximum
> temperature to be 1300 F per AISC LRFD manual.  The bolts are headed bolts
> made
> with standard A36 stock.
> Thomas Hunt
> Fluor Daniel