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Re: old rib bolts

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I would contact engineers involved with mining and tunneling operations.
As I recall. Rib Bolts are used to prevent collapse of tunnel walls.

Steven A.
Los Angeles



Dave Evans wrote:

> A drawing dated 1958 calls out 1" rib bolts in some connections and 1"
> H.S. bolts in others. In other words, it clearly makes a distinction
> between the rib bolts and the H.S. bolts.   No ASTM references are
> given.
>
> According to Salmon&Johnson, rib bolts were of ordinary rivet steel, but
> an AISC bibliography references a 1959 paper discussing A325 rib
> bolts, so apparently there were also high strength rib bolts back then.
>
> It appears that there is no way to deduce the strength of the rib bolts
> and that we must remove some and test them.
>
> Would appreciate any comments on this subject.
>
> Also, does anyone know of references that discuss rib bolts of that
> vintage in more detail?  What ASTM would non-high-strength rib bolts
> have been supplied to back then?  Would a 1" rib bolt be installed in a
> 1" hole?  Should there be head marks if the rib bolts were high strength?
>
> Thanks,
> Dave Evans, P.E.
> TNH, Inc.
>
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