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RE: Structural Bolts in Opened Kegs[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Structural Bolts in Opened Kegs
- From: Harold Sprague <spraguehope(--nospam--at)hotmail.com>
- Date: Mon, 5 May 2008 14:42:44 +0000
You need to get a copy of the Structural Bolting Handbook from the Steel Structures Technology Center. (This is Bob Shaw's company.) Reference pages 66 & 67. In it he provides good information and the appropriate references to the RCSC.
Specific to your inquiry. The RCSC states that only the manufacturer of the twist off bolts can re-lubricate the bolts. The other bolts should be verified by contacting the manufacturer.
The lubrication of bolts is a water soluble lubricant. Bolts can be over-lubricated and under-lubricated.
If you allow re-lubrication, requre a verification in the Skidmore if you have are requiring fully tensioned bolts. If the bolts are not fully tensioned, it is not much of an issue.
This is a pervasive problem for complicated structures. You may have a crew installing a lot of bolts and then the structure is hit by a rain storm prior to tensioning the bolts. The lubrication can be removed, and then you need to verify the tension in a representative number of bolts in a Skidmore. You need to verify that you can get the tension that is required.
I personally like using the combination of a twist off bolt (because of their ease of installation) and the use a load indicating washer (which can be checked with a feeler gauge). It still has to be verified in a callibrated Skidmore.
> Subject: Structural Bolts in Opened Kegs
> Date: Sat, 3 May 2008 12:25:01 -0700
> From: MSteiner(--nospam--at)ThorntonTomasetti.com
> To: seaint(--nospam--at)seaint.org
> All of the structural bolts on a project were stored in one location on
> the site. During a lift some construction materials fell on the storage
> area and broke open the pallet of bolt kegs.
> Not sure what quantities are standard bolts (A325, A490) compared to
> twist-off type (F1852). I've read and re-read the commentary in section
> 2.2 of the structural joint Specification. We aren't the designer for
> the project, but are trying to respond to the contractors request for a
> supply of all new bolts.
> Can standard A325 and A490 bolts be cleaned and lubricated by the
> fabricator or erector? Will manufacturers of twist-off bolts
> "re-lubricate" open containers?
> Matthew R. Steiner, P.E., S.E.
> Senior Project Engineer
> Thornton Tomasetti
> 2415 Campus Drive, Suite 110
> Irvine, CA 92612
> T 949.271.3300 F 949.271.3301
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