Bridge Rivets/Bolts for Historic Structure

[ms128]

I have a historic bridge where rivets that are to be replaced. New bolt heads are required to have the appearance of the existing rivets(on both ends of the bolt). Historic Commission has input. I've been looking for TC bolts that would look like this. Anyone have any experience with this kind of bolt? Does it exist? I called LeJeune - no luck!
I'm thinking the nut would look like the button end of a rivet, except it would have a hole in it for the bolt to thread - these would be TC bolts, so the ends would shear off, perhaps leaving a flat face aligning with button bolt end/hole.

 

[ms128]

Clarification...desired bolts would be TC twist-off type bolts, so the bolt end would shear off with the use of a Shear Wrench, perhaps leaving a flat face aligning with button bolt end/hole.

 

[hokie66]

There is no such thing (I believe). This is a ridiculous requirement. If the replacements have to look like rivets, they have to be rivets, not bolts.

 

[CoryPad]

The nut needs to be held fixed while the screw is rotated during tightening. If the nut is round like a rivet, how will it be held fixed?

 

[HgTX]

Let's try to keep all the responses to this in one thread:

http://www.eng-tips.com/viewthread.cfm?qid=247039&page=1

(Note to management: I'm NOT saying to delete this one.)

Hg


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