Extremely Neat Engineering

"Bman76 (hates WS6 hoods, is on his phone and has 4 burners now)" (bman76-4) 09/15/2020 at 10:41 • Filed to: None

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Floating the constructed tunnel sections into place  and then flooding them to get them to the bottom is super neat.

facw > Bman76 (hates WS6 hoods, is on his phone and has 4 burners now) 09/15/2020 at 10:55

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Cool! Build more tunnels!

OPPOsaurus WRX > Bman76 (hates WS6 hoods, is on his phone and has 4 burners now) 09/15/2020 at 10:55

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something similar was used for the Big Dig in Boston. They built the tunnels and floated them out. They had to sit then on top of piles which kind of turned the tunnel sections into a bri dge going over a subway tunnel.

facw > OPPOsaurus WRX 09/15/2020 at 11:02

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Yep. The Ted Williams T unnel sections were actually built in Baltimore and floated all the way up the coast to Boston before being sunk. I think they’re steel rather than concrete, but same idea.

If only EssExTee could be so grossly incandescent > Bman76 (hates WS6 hoods, is on his phone and has 4 burners now) 09/15/2020 at 11:10

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It's a good solution for when the earth under the water body is to soft or wet to tunnel through. They can just dredge a trench and bury the tunnel pieces.

ClassicDatsunDebate > Bman76 (hates WS6 hoods, is on his phone and has 4 burners now) 09/15/2020 at 11:12

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The George Massey tunnel was built in 1959.  It was the first one in North America to be built like this.  It’s still in use today.  There’s a great old timey documentary on its construction on YouTube.  

Roadkilled > ClassicDatsunDebate 09/15/2020 at 12:13

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The Hampton Roads Bridge-Tunnel used immersion tunnel construction and was completed in 1957, 2 years before the Baltimore tunnel.

ClassicDatsunDebate > Roadkilled 09/15/2020 at 12:43

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I’m just going by the recorded history of my elders

davesaddiction @ opposite-lock.com > Bman76 (hates WS6 hoods, is on his phone and has 4 burners now) 09/17/2020 at 14:55

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So cool.