You older eggers might remember my constant recommendation of "double nutting"...

RRP · October 22

ATTENTION: Get out your cameras! RRP is getting ready to eat a big HUMBLE PIE! Yes, as @alaskanassasin and @Canugghead surmised those black lines were in fact magic marker drawn lines. Had I gotten closer yesterday I would have seen that fact. It was an honest mistaken belief, but- now chomp chomp chomp

BTW there were some of those nuts laying around and they each weighted at least 3 pounds or maybe 4 - but don't quote me as I don't have a good track record! chomp chomp chomp

alaskanassasin · October 22

thanks for taking the time to swing back through @RRP

Canugghead · October 23

Thanks Ron, for circling back. You got me scratching my head baffled as to how they were able to line up the precut kerfs perfectly, after the nuts were torqued to specs.
I should have looked closer, zoom in at the tip of the rightmost arrow, see how the line extends from the two nuts and runs over the slab?

Image: https://us.v-cdn.net/5017260/uploads/editor/s2/uytj32an8du6.png

Begger · October 23

Depends and depends.
Double nutting large columns? Sure.
Elastic stop nuts might not take the temp.
Cotter pins / castellated nuts? Also have a place.
In some cases, you could even use some kind of thread compound.
I have some locktite for 1/4" and smaller hardware. Non-hardening.
But I think its the blue version which is some serious stuff.....and hardens....

fishlessman · October 23

see what happens when you dont double nut the glued in ceiling studs in a tunnel....maybe they should have used duct tape

Canugghead · October 23

fishlessman said:

see what happens when you dont double nut the glued in ceiling studs in a tunnel....maybe they should have used duct tape

Interesting read:
https://en.wikipedia.org/wiki/Big_Dig_ceiling_collapse#:~:text=The%20Big%20Dig%20ceiling%20collapse,year%2C%20causing%20chronic%20traffic%20backups.
FWIW, root cause wasn't the lack of double nutting?

fishlessman · October 23

Canugghead said:

fishlessman said:

see what happens when you dont double nut the glued in ceiling studs in a tunnel....maybe they should have used duct tape

Interesting read:
https://en.wikipedia.org/wiki/Big_Dig_ceiling_collapse#:~:text=The%20Big%20Dig%20ceiling%20collapse,year%2C%20causing%20chronic%20traffic%20backups.
FWIW, root cause wasn't the lack of double nutting?

there was some things that never really got on the reports. contractor used a fast set epoxy instead of the approved one which wasnt up to the job. neither were any good to hold those studs in as whats the lifetime of a tunnel (maybe 75 or so years) under a harbor and whats the lifetime of an epoxied in stud. on top of that there were more studs than needed so some studs were wrapped in duct tape and simply pushed into the hole to look like they were epoxied in, you could literally pull them out by hand.....that whole project was a nightmare. think about all the steel in the concrete and think about all the salt water leaching in from above, the river in that area is salty with tidal flow and it leaks into the tunnel to get pumped out

Begger · October 23

fishlessman said:

see what happens when you dont double nut the glued in ceiling studs in a tunnel....maybe they should have used duct tape

big dig huge con and at that point, most $$$ public works project in US history.
But it is easily outdone by California High Speed Rail.

You older eggers might remember my constant recommendation of "double nutting"...

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