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Re: ASTM For Headed Anchor Bolts

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I specify that a lightly torqued [10 to 15 ft-lb.] double nut be used on the
embedded end of an embedded threaded anchor, not to prevent turning, but to
take-up play in the assembly: there is possibility of slight longitudinal
displacement of a single nut when tension is applied.

I first noticed this on a project using Threadbar reinforcing spliced with
couplers.  In that case, there can be as much as 1/8" of longitudinal
looseness through the coupler.  A nut tightened against each end of the
coupler pulls each rod of the splice tightly against the coupler's threads
and eliminates the possibility of an unexpected unrestrained elongation when
tension reaches the assembly.  The looseness in a nut on a structural bolt
is not nearly as much, but the double nut is a way to completely eliminate
it.

Nels Roselund
Structural Engineer
South San Gabriel, CA
njineer(--nospam--at)att.net


----- Original Message -----
From: "Harold Sprague" <spraguehope(--nospam--at)hotmail.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Tuesday, October 19, 2004 2:25 PM
Subject: Re: ASTM For Headed Anchor Bolts


| A jamb nut or double nut is just another piece that is not really needed
if
| you have the threads punched.  If you do double nut or use a jamb nut, you
| need to tension / torque the jamb nut enough to cause local thread
| deformation if you want to prevent nut rotation.  I just prefer punching
the
| threads.  It is quick and easy.
|
| Regards,
| Harold Sprague
|
|
|
|
| >From: "M. David Finley, P.E." <pec(--nospam--at)isgroup.net>
| >Reply-To: <seaint(--nospam--at)seaint.org>
| >To: <seaint(--nospam--at)seaint.org>
| >Subject: Re: ASTM For Headed Anchor Bolts
| >Date: Tue, 19 Oct 2004 15:43:12 -0400
| >
| >How about just double nuts at the bottom?  This elininates the need to
| >mechanically deform the threads.
| >
| >David Finley
| >
| >
| >
| >----- Original Message -----
| >From: "Harold Sprague" <spraguehope(--nospam--at)hotmail.com>
| >To: <seaint(--nospam--at)seaint.org>
| >Sent: Tuesday, October 19, 2004 1:43 PM
| >Subject: RE: ASTM For Headed Anchor Bolts
| >
| >
| > > Rich,
| > >
| > > This is not a problem.  Sometimes it takes a 2x4 between the eyes to
| > > persuade someone to use headed anchor bolts.
| > >
| > > The correct spec for all anchor bolts is ASTM F 1554.  There are many
| >tests
| > > that show that the hooked anchor bolts do not work reliably.  The
| >maximum
| > > length that you can get using an A 307 is about 8 inches.  Longer
headed
| > > bolts than 8" will be "hot headed".  But hot heading is expensive for
| >small
| > > quantities like anchor bolts.
| > >
| > > The best way is to draw a detail with a rod threaded on each end with
a
| >nut
| > > on the anchored end with the threads mechanically deformed.  They will
| >take
| > > a punch and drive it into the threads at the nut interface to "lock"
the
| >nut
| > > to the bolt shaft to form the head.  They can also use all-thread for
| >the
| > > bolt shaft.  It saves the threading process.
| > >
| > > Regards,
| > > Harold Sprague
| > >
| > >
| > >
| > >
| > > >From: richard lewis <rlewistx(--nospam--at)juno.com>
| > > >Reply-To: <seaint(--nospam--at)seaint.org>
| > > >To: seaint(--nospam--at)seaint.org
| > > >Subject: ASTM For Headed Anchor Bolts
| > > >Date: Tue, 19 Oct 2004 12:33:01 -0500
| > > >
| > > >What is the correct ASTM for headed anchor bolts that are commonly
| > > >available.  I have been using A307.  Is that the right one for anchor
| > > >bolts?  Is this commonly available?  I'm trying to persuade some of
my
| > > >contractor clients into using headed anchor bolts instead of the 'J'
| > > >bolts because the tension values are higher.  I have a job right now
| > > >where the 'J' bolts are "on the job" even though my details show
headed
| > > >bolts and the contractor is telling me how difficult it is to get
| >headed
| > > >bolts.  I would like to get headed bolts in the range of 12" to 16"
| > > >overall length if possible.
| > > >
| > > >Thanks.
| > > >
| > > >Rich
| > >
| > > _________________________________________________________________
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