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Truck driver waits for rescue inside the dangling cab of a semi-truck after a bridge collapse in China's Guizhou province. (i.imgur.com)

submitted 4 days ago* (last edited 4 days ago) by [email protected] to c/[email protected]

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[–] [email protected] 38 points 4 days ago (2 children)

I'm guessing from the rain and the bare earth that this was a landslide?

[–] wildbus8979 27 points 4 days ago

Correct, there's been massive flooding in the area.

[–] [email protected] 8 points 4 days ago (1 children)

Looks like it. One set of pillars seems to be gone (the bridge in the front) dropping two segments, and the foundation of the pillar on the rear bridge has seriously moved around - you can see that the pillar is anything but straight, causing one segment to fall.

So either the foundation was not set deep enough, or the pillars broke just above the foundation. And for some reason, the segments were just placed on top of the pillars and not connected to each other by steel cables running the full lenght of the bridge.

[–] [email protected] 2 points 4 days ago (1 children)

Steel wires in the same plane (ie horizontal anchoring) as the horizontal segments could hold up even a single segment?

I wasn't aware they are there, how are they called so I can learn more?
I've had a quick look at some schematics & didn't find anything.
Also afaik tensioned steel wires (prob not just on bridges) arent allowed to be hidden (at least in Europe) to allow for inspection.

[–] [email protected] 3 points 4 days ago (1 children)

Well, they seem to exist. I recalling a news article where a pylon of a bridge broke, and the segments were held together by such a cable. It didn't leave a usable bridge, but at least nothing big and more important nobody fell down.

And whether they were hidden or not, I cannot give you an answer, but I think they could be accessible in the innards of the segments corpus, which in turn must be accessible anyway for inspection.

[–] [email protected] 4 points 4 days ago* (last edited 3 days ago)

Was it a proper viaduct like this one (tho this is a medium one, with roadways separated completely into two "bridges") or a much smaller one?

I'll look into it when I have more time.
(Tho the more I think about it the more I see a structurally unsound cable connecting the top pieces as a liability - it could be the cause for the collapse of the whole bridge instead of just the two sections in one & three on the order bridge ... and if it could support the road then why not just beef up the cable & not use supports? ... it might just not be possible)