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Re: Anchor Embedment[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: Re: Anchor Embedment
- From: gfergus(--nospam--at)entergy.com
- Date: Wed, 16 Sep 98 15:30:13 -0600
The important item to measure is the final anchor embedment depth. The extra depth of the hole given by the Hilti Product Technical Guide is to allow the bolt to "pull up" when the torque is applied to set the anchor. Without having the anchor actually installed deeper than the minimum embedment prior to torquing, the final embedment would wind up being less than the minimum embedment. ______________________________ Reply Separator _________________________________ Subject: Author: "Dave Morris" [SMTP:davem(--nospam--at)endex.com] at ENT-01 Date: 9/16/98 2:57 PM 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). 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.
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