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Re: Anchor Embedment Inspection[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: Anchor Embedment Inspection
- From: "Sandy Pringle" <sandyp(--nospam--at)sic-inc.com>
- Date: Wed, 16 Sep 1998 20:22:23 -0700
The INSPECTION ISSUE AGAIN!!! At 12:57 PM 9/16/98 -0700, you wrote: >I have a question, particularly for any special inspectors on the list. For >expansion bolts we have always specified minimum embedment length on our >drawings and schedules. In Hilti's Product Technical Guide (And I assume on >others) the required hole depth is greater than the embedment by one bolt >diameter. This is due to the fact that the load is transferred at the wedge >not at the bottom of the bolt. My questions to the inspectors are this: > >1) When you are checking depth of holes are you checking against minimum >embedment or are you checking for the minimum hole depth (which will always >be deeper for expansion bolts). Pursuant to the ICBOES Research Reports installation procedures, the Special Inspector should be aware of the difference in the initial embedment and the final, torqued embedment. However there is only one agency, the City of LA, whose licensing procedure for Deputy Inspectors (also known as Special Inspectors) includes an additional examination specifically for the installation of Drilled-in Anchors and only with the successful completion of this examination is an Inspector deemed qualified to inspect a Drilled-in Anchor. There are many different varieties of this anchor, be it epoxy, undercut, back cut, shell, deformation, wedge and more and you as an Engineer should be aware of the qualifications required. One simple way is to specify an accredited Inspection Agency for assurance that the quality of the inspection is what you'd expect. Chapter 17 of the UBC has mandated for several code cycles that the Engineer of Record "specify the name of the individual or firms that will performing the inspections and what they will be inspecting". >2) Does it create problems in the field when the plans list only embedment >and not minimum hole depth? Which would you like to see specified on the >plans? (Both??) As a design engineer I am very rarely on the job during anchor >installations. We depend on the special inspector for these verifications >in critical applications. My feeling is that we will need to be more >specific on our drawings and schedules so it is very clear that we are >getting the embedment we need. It certainly couldn't hurt to spell it. Especially if yu aren't familiar with the Inspection Agency. And don't confuse Test Labs and Inspection Agencies. Certification as a Test Lab does NOT mean accreditation as an Inspection Agency. They are two different issues and although a Test Lab can also be accredited as an Inspection Agency, only one in Southern California has sought and achieved that status, so you should be really particular with your Inspection Program. A copy of an Inspection Program that exceeds the minimum requirements of the UBC can be found through my web site, if you're interested. Still plugging, R. Sandy Pringle STRUCTURAL INSPECTION CONSULTANTS Inc. sandyp(--nospam--at)sic-inc.com (800)598-1970 Fax(310)376-5294 http://www.sic-inc.com Hermosa, Redondo and Carson, CA Live your life as an exclamation, not an explanation.
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