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RE: Double Nuts on Anchor Rods - Leveling base plates

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As I stated in some previous posts, the most common way to set columns is to shoot in a shim stack at the center of the bolt group. The top of the shim stack will be at the bottom of base plate elevation. The column is then placed on the bolts with nuts and plate washers to accomodate the oversized holes. The column is plumbed and aligned by tightening or loosnening the nuts. If the columns are larger, wedges are driven into the sides to increase the moment arm and move the column easier. Shim stacks remain, but wedges (if used) are removed prior to grouting.

If the column base plates are REAL big (like a coal fired power plant boiler building) the base plates are shipped loose and leveled in the field with leveling screws that are welded to the base plate. The column is then placed on top of the base plate. These are rare birds and the base plates can weigh a ton (literally).

Regards,
Harold Sprague





From: "Lloyd Pack" <packman90(--nospam--at)qwest.net>
Reply-To: <seaint(--nospam--at)seaint.org>
To: seaint(--nospam--at)seaint.org
Subject: RE: Double Nuts on Anchor Rods - Leveling base plates
Date: Fri, 13 Jan 2006 10:30:16 -0700

On 13 Jan 2006 at 16:26, Harold Sprague wrote:

> I have seen double nuts indicated for the retention of embedded anchor
> ends and anchor plates in ASCE Petrochemical Energy Committee "Design
> of Anchor Bolts in Petrochemical Facilities".  And leveling nuts are
> indicated in AISC Design Guide 1 Column Base Plates although I prefer
> other methods of leveling.

Harold,

You mentioned that you prefer other methods of leveling a column base
plates.  Please elaborate on that a bit more.  I would like to expand my
knowledge in this area, and value your experience and knowledge.


Thank you,
Lloyd Pack


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