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Re: Overhead anchors

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Good point! but it seems the days of drypacking are long gone.

Steven A.
Los Angeles



Daryl Richardson wrote:

> Fellow engineers,
>
>         Why not use non shrink or expanding cement based grout for this
> application?  I would expect this type of material to work very well.
>
> Respectfully submitted,
>
> H. Daryl Richardson
>
> Forrest Braun wrote:
>
> > William
> >
> > On various Corps projects that I have worked on adhesive anchors were
> > not allowed.  The argument was that 1) epoxy will allow creep such that
> > under long term tension loads the anchor will pull out, 2) keeping the
> > epoxy in the overhead hole during installation is difficult, and 3)
> > under elevated temperatures or fire conditions the epoxy will loose
> > strength and release the anchor creating an additional hazard.  Some of
> > the acrylic adhesives solve the temperature and creep problems but may
> > still have the installation problem.  Expansion anchors were accepted
> > for overhead conditions.
> >
> > "Sherman, William" wrote:
> > >
> > > Engineers in our office have expressed concerns with using expansion anchors
> > > in overhead applications, such as hanger supports, due to the potential of
> > > long-term slippage under constant tension. I do not see any cautions noted
> > > on the use of expansion anchors in such applications in manufacturer's
> > > literature or in ICBO reports. Does anyone know if there is documentation of
> > > slippage of "friction-type" anchors in constant tension applications?
> > >
> > > We often prefer to use adhesive anchors in overhead applications, when
> > > drilled-in anchors are required - but concerns have also been raised with
> > > such anchors due to the potential softening of the adhesive in case of a
> > > fire. Also, overhead installation of adhesive anchors is more difficult.
> > > Does anyone have other recommendations for application of post-installed
> > > anchors in overhead applications?
> > >
> > > William C. Sherman, PE
> > > CDM, Denver, CO
> > > Phone: 303-298-1311
> > > Fax: 303-293-8236
> > > email: shermanwc(--nospam--at)cdm.com
> > >
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> > --
> > ++++++++++++++++++++++++++
> > Forrest T. Braun, P.E.
> > BBFM Engineers, Inc.
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> > Anchorage, Alaska
> > http://www.bbfm.com
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