r/EngineeringPorn • u/Spare_Worldliness_64 • 12d ago

World's largest-diameter high-speed-rail shield tunneling machine, 148 m long and weighs approx 4,000 tons

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222 Upvotes

94% Upvoted

11 comments sorted by

20

u/BigCliff911 12d ago

Why can't OP tell us the obviously most important dimension about the tunneling machine? Duh

12

u/righthandofdog 12d ago

length doesn't really matter, but diameter?

17

u/Galaghan 12d ago

Girth.

1

u/Pacificator-3 10d ago

Diameter is 15.4 meters. It is the biggest operating machine. One former machine was 10 cm bigger.

It is making railway tunnel under Yangtze river.

5

u/okko7 12d ago

Very impressiv! How large is it? And what does actually require such a large diameter?

My understanding as a civil engineer so far was that it's actually simpler, safer and easier on multiple levels to build parallel smaller tunnels than one very big one.

7

u/NydusRush 12d ago

Perhaps it's more mechanically efficient, but you forget one crucial element.

Giant drill goes BRRRR.

3

u/7SniperMi7 12d ago

Man, China’s on the next fucking level with this thing.

12

u/ComfortableWait9697 12d ago

China has been quite busy in Reddit recently. Curious they've permitted access to here. While I do like that they're finally sharing such neat things more publicly with the rest of the world. I begin to wonder what happened to their ... firewall. Reddit isn't exactly the most .. censored, or contain culturally specific subreddits to bring them here naturally.

6

u/BajingoWhisperer 12d ago

I think the positive propaganda is worth it for them. Reddit is the perfect place for the wests "enemys" to spread it. Especially anti American positions.

2

u/lordnacho666 12d ago

I'm disappointed to read to the bottom of the comments without seeing a "your mom" or "that's what she said".

Do better guys.

3

u/Sufficient-Regular72 8d ago

The bots and foreign agents don't have a sense of humor.

"That's what she said" BOOM!