3 ms·

I think OP is referring to using the interior space of the segment for buoyancy rather than hauling it on a barge, not prefabrication in general.

brnt 5y ago
The caisson technique is not new.
- jamiek88 5y ago
  It’s not caisson either. How about understanding the conversation and questions being asked before jumping in with dismissive (incorrect) answers?
- ghostly_s 5y ago
  ? This is not caisson construction.
  - brnt 5y ago
    It's what the construction consortium writes they are doing [1]. Looks like it too? [1] https://www.betoningenieure.de/dateien/FT2018/Seiten/fehmarn.html https://www.betoningenieure.de/dateien/FT2018/Seiten/fehmarn...
    - sitkack 5y ago
      What that shows is the mold that is used to make the tunnel segments. A Caisson is like an upside down boat turned into a diving bell that is used to get access to the seafloor. https://en.wikipedia.org/wiki/Caisson_(engineering) https://en.wikipedia.org/wiki/Caisson_(engineering) Famously used in the construction of the Brooklyn Bridge https://fromthepublicdomain.com/2020/08/26/the-brooklyn-bridge/ https://fromthepublicdomain.com/2020/08/26/the-brooklyn-brid... 10 minute documentary on Brooklyn Bride https://www.youtube.com/watch?v=Ct_-0GC_QfM https://www.youtube.com/watch?v=Ct_-0GC_QfM The Ken Burns' documentary is really worth a watch, https://en.wikipedia.org/wiki/Brooklyn_Bridge_(film) https://en.wikipedia.org/wiki/Brooklyn_Bridge_(film) https://www.pbs.org/kenburns/brooklyn-bridge/ https://www.pbs.org/kenburns/brooklyn-bridge/
    - ghostly_s 5y ago
      I think this might be a translation issue - the German Senkkasten is literally "sinking-box," so maybe it does apply to structures like these segments too? But the English caisson only means the diving-bell things.
      - jaclaz 5y ago
        Yes it must be lost in translation somehow, in Italian also "cassone" is both the "diving bell" thingy and the "sinking box". The Mose in Venice (though it is a sort of foldable dam) has inside a tunnel for maintenance and it was built in a similar way: https://www.mosevenezia.eu/cassoni/ https://www.mosevenezia.eu/cassoni/
      - Someone 5y ago
        > But the English caisson only means the diving-bell things. https://en.wikipedia.org/wiki/Caisson_(engineering) https://en.wikipedia.org/wiki/Caisson_(engineering) disagrees. It distinguishes between box caissons and open caissons.
        ghostly_s 5y ago
        That's still not what's being used here.

brnt 5y ago

The caisson technique is not new.

jamiek88 5y ago
It’s not caisson either. How about understanding the conversation and questions being asked before jumping in with dismissive (incorrect) answers?
ghostly_s 5y ago
? This is not caisson construction.
- brnt 5y ago
  It's what the construction consortium writes they are doing [1]. Looks like it too? [1] https://www.betoningenieure.de/dateien/FT2018/Seiten/fehmarn.html https://www.betoningenieure.de/dateien/FT2018/Seiten/fehmarn...
  - sitkack 5y ago
    What that shows is the mold that is used to make the tunnel segments. A Caisson is like an upside down boat turned into a diving bell that is used to get access to the seafloor. https://en.wikipedia.org/wiki/Caisson_(engineering) https://en.wikipedia.org/wiki/Caisson_(engineering) Famously used in the construction of the Brooklyn Bridge https://fromthepublicdomain.com/2020/08/26/the-brooklyn-bridge/ https://fromthepublicdomain.com/2020/08/26/the-brooklyn-brid... 10 minute documentary on Brooklyn Bride https://www.youtube.com/watch?v=Ct_-0GC_QfM https://www.youtube.com/watch?v=Ct_-0GC_QfM The Ken Burns' documentary is really worth a watch, https://en.wikipedia.org/wiki/Brooklyn_Bridge_(film) https://en.wikipedia.org/wiki/Brooklyn_Bridge_(film) https://www.pbs.org/kenburns/brooklyn-bridge/ https://www.pbs.org/kenburns/brooklyn-bridge/
  - ghostly_s 5y ago
    I think this might be a translation issue - the German Senkkasten is literally "sinking-box," so maybe it does apply to structures like these segments too? But the English caisson only means the diving-bell things.
    - jaclaz 5y ago
      Yes it must be lost in translation somehow, in Italian also "cassone" is both the "diving bell" thingy and the "sinking box". The Mose in Venice (though it is a sort of foldable dam) has inside a tunnel for maintenance and it was built in a similar way: https://www.mosevenezia.eu/cassoni/ https://www.mosevenezia.eu/cassoni/
    - Someone 5y ago
      > But the English caisson only means the diving-bell things. https://en.wikipedia.org/wiki/Caisson_(engineering) https://en.wikipedia.org/wiki/Caisson_(engineering) disagrees. It distinguishes between box caissons and open caissons.
      - ghostly_s 5y ago
        That's still not what's being used here.