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Re: Sole plate anchor rod holes

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Anchor "rods" are installed by laborers. Even if they use plywood templates, the templates are made by laborers.

ACI 117 dictates the tolerance for placement of embedded items as:
2.3.2 Vertical alignment, lateral alignment, and level alignment .................1 in.

I require steel setting templates to be fabricated and sent by the steel fabricator. The holes in the setting template are 1/16" over the bolt diameter. At least if they are off, the entire group is off. You can also specify a tighter tolerance in anchor rod placement. All that would do is make it harder to backcharge for misalignment, but anything outside of "normal" construction tolerance causes great consternation.

Normal structural steel has tolerance requirements of + - 1/16". Normal mill wright tolerances get into thoushandths of an inch.

The trick is to accomodate every trades' normal tolerances. Allow for interfaces to take up tolerance difference.

Harold Sprague

From: ad026(--nospam--at) (Paul Ransom)
Reply-To: <seaint(--nospam--at)>
To: seaint(--nospam--at)
Subject: Re: Sole plate anchor rod holes
Date: Sat, 17 Sep 2005 13:09:53 -0400

> From: "Dean Briggs" <dean(--nospam--at)>

> In 2003 AISC updated (AISC Manual of Steel Construction 9th ed pp 4-130)
> table, the Oversize Hole for 1 1/2"dia to as much as 2 5/16" if a heavy
> plate (5/16 to 1/2) washer is used.  All this is being driven by common
> practice of misplacement of anchor bolts by concrete trades (not
> conforming to AISC Code of Std Practice 7.5.1). =20

The problem is that the concrete trades have a set of drawings that say
they should use the ACI tolerances for setting anchors.

R. Paul Ransom, P. Eng.
Burlington, Ontario, Canada
<mailto:ado26(--nospam--at)> <>

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