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RE: Leveling Nuts

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This is iron working 101.

The top of concrete foundations is never flat. Concrete tolerances are + or - 3/4". Steel tolerances are + or - 1/16".

1. A laser level is set up, and a bucket of 2"x2" of shims of various thicknesses are carried around by an iron worker. He sets up at the theoretical bottom of steel column and shoots in the top of concrete. The difference is the shim stack which is set in the center of the anchor bolt group

2.  The column is set on the shim stack.

3.  Plate washers and nuts are placed on the anchor bolts.

4.  Set the frame.

5. The columns are plumbed and aligned. (Optional and good safety practice.) Drive shims in between each pair of anchor bolts at the edge of the base plate.

6. Grout in the base plate leaving the steel shims in place. Remove the wedges.

This is the way that 90% of steel frames are set.

Regards,
Harold Sprague





From: Padmanabhan Rajendran <rakamaka(--nospam--at)yahoo.com>
Reply-To: <seaint(--nospam--at)seaint.org>
To: seaint(--nospam--at)seaint.org
Subject: RE: Leveling Nuts
Date: Thu, 15 Sep 2005 19:28:01 -0700 (PDT)

Harold,

If shim plates are used, how much of the volume below
the base plate is taken up by them? Do they get buried
in the grout?

Rajendran

--- Harold Sprague <spraguehope(--nospam--at)hotmail.com> wrote:

> As a former iron worker, I do not like leveling
> nuts.  Most iron workers
> will not use them even if you show them.  The
> preference is to use shims and
> wedges and nuts with plate washers on the top of the
> base plate only.
>
> That said, if you choose to use them, there is no
> justification in what the
> plan checker is asking.  What he is trying to do is
> get the grout to take
> all of the compression without loading the bolts in
> compression.  The answer
> is so what if they do take a measure of compression.
>  It will not have a
> major impact on the performance.
>
> Regards,
> Harold Sprague
>
>
>
>
>
> >From: "John L. Smart" <smartj(--nospam--at)smartengineers.com>
> >Reply-To: <seaint(--nospam--at)seaint.org>
> >To: <seaint(--nospam--at)seaint.org>
> >Subject: Leveling Nuts
> >Date: Wed, 14 Sep 2005 12:04:42 -0400
> >
> >I have a plan reviewer telling me that if I allow
> leveling nuts, I must
> >specify that the column be leveled, shimmed, then
> the leveling nuts backed
> >off before grouting. The erectors I have asked have
> never heard of this.
> >Has
> >anyone else? I assume the point is to keep the
> column from sitting on the
> >bolts, but so what?
> >
> >
> >
> >John L. Smart
> >
> >Lindsey & Ritter, Inc.
> >
> >smartj(--nospam--at)smartengineers.com
> >
> >
> >
>
>
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