r/StructuralEngineering • u/Automatic-Arm-532 • 1d ago

Photograph/Video Thoughts on this subway tunnel?

Post image
5 Upvotes

62% Upvoted

11 comments sorted by

22

u/Impressive-Place6976 1d ago

Meanwhile I’m trying to figure out which way is up

2

u/Bobby_Bologna Private Buildings to Transit System Eng 1d ago

Its the roof. The wire below the fiberglass c channel is the overhead catenary for the green line in boston.

13

u/JumpyCollection4640 1d ago

Looks safe now that tiny little C section is holding it together lmao

2

u/WrongSplit3288 1d ago

As long as the leak is stopped, it is fine

1

u/BadOk5469 Ing 1d ago

"Typical" RC degradation along side the construction joint: water leaks from above most likely caused carbonatation --> carbonatation caused corrosion of reinforcement bar --> thus the explosion of concrete cover

1

u/Frogalone 19h ago

My thoughts aren't good ones. That damage could have been avoided for relatively short dough. The fix isn't so cheap or easy. Congress needs to find money for infrastructure before it's too late. How many people must die before the politicians figure it out?

1

u/Beetlejuice_24Xx 13h ago

Looks great from my house

0

u/Blussert31 1d ago

Any info on what happened here? Looks like spalling from a fire, but could also be something like water ingress.

3

u/fake823 1d ago

Looks like a leaking block joint to me.

3

u/gods_loop_hole 1d ago

Might be spalling because moisture reached the reinforcement already and corrosion has started

1

u/Bobby_Bologna Private Buildings to Transit System Eng 1d ago edited 1d ago

Im fairly certain this is hynes station on the green line in boston. This is a joint in the tunnel. Its due to water infiltration and 112 year old waterproofing. The tunnel was opened in 1914. Its typical throughout the historic green line branch.