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Re: Overhead anchors

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If it is a critical application you could also use an undercut anchor such as Drillco or HILTI Self-Undercuting HDA.

Thomas Hunt, S.E.
ABS Consulting

"Sherman, William" <ShermanWC(--nospam--at)>

02/12/2003 06:55 AM
Please respond to seaint

        To:        "SeaInt Listserver (E-mail)" <seaint(--nospam--at)>
        Subject:        Overhead anchors

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)

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