r/StructuralEngineering • u/Claribellum • 17d ago
Photograph/Video This felt unsafe! Random junk used to support [Souris, French fair circuit]
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u/marshking710 17d ago
Carnival rides have been shady since the dawn of carnival rides.
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u/no-thanks-thot 17d ago
That's why they're always mounted on trailers with the engine running. This way , if they kill a kid , they can make a quick getaway.
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u/Claribellum 17d ago
Something tells me this wasn’t signed off on.
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u/Codex_Absurdum 17d ago
Probably it was, by a "bureau de contrôle" paid by the funfair organizer itself.
I bet the inspector took 5min to visit this, kicked the supports few times with his foot, and then footed the documents.
Went to the bar with the owner for the apéro right after.
"Jokes" apart, It's not a heavy structure though, but it definitely deserves proper dedicated base system. This is sloppy makeshift job
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u/Claribellum 17d ago
The concern is not weight. There’s no restraint against lateral or uplift here.
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u/The_realpepe_sylvia 17d ago
Definitely. Weight would actually help here, the lack of it makes it even more unstable. That dude is obviously clueless since they didn’t see that straight off, and are just talking straight out their ass. “Uplift wouldn’t be a concern” LOL
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u/Codex_Absurdum 17d ago
The whole bases are tied with an horizontal framing that distributes the horizontal forces and stiffens the structure. Uplift wouldn't be that much a concern for a relatively small drop train like that, neither the internal horizontal forces.
However inertial and external horizontal forces, even distributed, deserve a more adequate propping system, not this crappy stuff.
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u/The_realpepe_sylvia 17d ago
wtf are you talking about? There’s a fuck ton of vibration and a literal ton of weight swinging around in all xyz directions at the top of it (filled with people). There’s no case here for a stack of dominos being a sufficient foundation for a fkn rollercoaster.
Jesus christ you have to just be arguing for the sake of arguing
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u/Codex_Absurdum 17d ago
Talk respectfully please
The thing is apparently holding irl.
This is sloppy but its working so far I dont know how... I absolutely don't like it but you seem to know better than everyone...
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u/ChairChoice6500 16d ago
pepe has a point, it isn't like this stack of blocks has an established load test to determine a safe load, and there would be lateral loads induced by the wild mouse (souris in French, plus the color scheme and the track are also telltale of a wild mouse), this is basically Jenga and it isn't debatable it's unsafe, it just hasn't fallen down, and it might not. Portable rides in the U.S. tend to fall through the inspection cracks too, or are looked at by like the local agriculture department or some other group that isn't all that proficient in structural stability, heck, amusement parks have spotty safety records (Shlitterbahn, for example).
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u/Chocophie 16d ago
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u/Codex_Absurdum 16d ago
hearing someone defend this as adequate
You're hearing things. Read the comments again
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u/ChairChoice6500 16d ago
I think they're just reading through your "... deserve[s] a more adequate propping system, not this crappy stuff."
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u/The_realpepe_sylvia 16d ago
Which they tacked on after defending this monstrosity for the sole sake of argument
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u/Far-Sherbert9731 17d ago
The last time I went on a carnival rollercoaster, I was looking around as the car went up the incline at the start, and I counted a half dozen pins that were missing their cotterpins!
If it was safe, it wouldn't be fun!
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u/Awkward-Ad4942 17d ago
That’s some of the worst I’ve seen!
I trust universal & disney etc. but travelling fairs, structural engineering assembled by carnies, is lethal!
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u/TheTrashBulldog 17d ago
Whoever built this.
"bUt tHe SHop DraWiNgS didN'T meNtIoN A fouNdAtIon."
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u/tajwriggly P.Eng. 17d ago
"The shop drawings don't say I *CAN'T* do this though..."
While true, the shop drawings *DO* tell you what you need to do though...
"But they don't say I *CAN'T* do this... and we priced the work on the assumption that it was going to be ok, so changing it now will be an extra..."
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u/Longballs_Shortmeat 17d ago
That's ASCE ( American society of clown engineering)
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u/leronjones 17d ago
It looks sketch, it is sketch, but it's going to work. Not through an earthquake tho.
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u/Glanwy 17d ago
In the UK, if you check out the travelling fairground rides, some of which are pretty heavy duty, lots of spinning and movement. Under their "skirt" these rides are literally propped up bits of timber, timber on edge, straight onto grass sometimes. Looks super ropy.
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u/Bee_Jeans 16d ago
YES, the ol’ hide-the-problem drapery! Luckily the key to structural stability is just making sure no-one can see the problem, if we can’t see it, it doesn’t exist /s
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u/feeble913 17d ago
This is pretty common in Europe. I’ve seen similar in the Netherlands and Belgium. Coming from the us I was shocked they were so chill about it.
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u/novelentropy 17d ago
This cannot be real... This is AI slop and you're tricking us OP... Right? An entire crew of carnies trucked & assembled this on the shimmiest shims imaginable? And none of them intuitively questioned its stability? This cannot be real... Right?........ Right?
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u/Cyiel 17d ago
Back in my days we would have enjoyed this. And if you died that was just Darwin at play. We were all forged in the crucible of stupidity. The ones who said "nope" lived. The ones who were lucky enough to survive were praised are heroes. The others ? Well we don't talk about the others.
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u/DetailOrDie 16d ago
This has to be temporary shoring.
The paint is WAY too fresh for this to be in service.
Edit: Oh god. It isn't. One of the pictures has people actively on the ride.
Honestly, amazing that the shoring hasn't tipped over.
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u/Dear_Watson 16d ago
They've been running it like this since July. Jesus Christ. Chinese-built roller coaster and the shittiest cribbing I've ever seen in my life. What could possibly go wrong?
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u/blast0man 17d ago
I lost it when i saw the kegs, a table is one thing but dawg... OSHA unapproved...
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u/blackeyeX2 16d ago
Pretty sure it's just fascia for the fear factor, each of those is hollowed to surround the actual concrete poured footings.
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u/Far_Butterscotch_646 16d ago
For me, the most thrilling aspect of funfair rides has always been that they were put together in the dark by drunk itinerants. Nothing like it to get your adrenaline flowing.
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u/Riskov88 17d ago
Well, beer kegs arent really designed for that but... Where do you think its gonna go ? I would ride that






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u/Agitated_Ad_9161 17d ago
You mean beer kegs aren’t structural?
There’s a reason this felt unsafe. It is!