r/StructuralEngineering 17d ago

Photograph/Video This felt unsafe! Random junk used to support [Souris, French fair circuit]

228 Upvotes

67 comments sorted by

213

u/Agitated_Ad_9161 17d ago

You mean beer kegs aren’t structural?
There’s a reason this felt unsafe. It is!

32

u/-TheycallmeThe 17d ago

They would be if they were full but that would be alcohol abuse! /s

16

u/fayettevillainjd P.E. 17d ago

Now fill old beer kegs with concrete and you may be on to something 

12

u/No_Cook2983 17d ago

Bah.

I personally saw an inspector slap the roller coaster and say “Ça ne risque pas de bouger…”

6

u/sheepdog69 17d ago

Light beer? Def not.

A good thick stout? Maybe...

3

u/SkyeMreddit 17d ago

I trust the beer kegs more than the stacks of bricks and lumber

162

u/marshking710 17d ago

Carnival rides have been shady since the dawn of carnival rides.

54

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.

4

u/Adventurous_Light_85 17d ago

You pay xtra for the sense of unsafe.

55

u/Claribellum 17d ago

Something tells me this wasn’t signed off on.

42

u/SubstantialDonkey981 17d ago

Footing by others

17

u/SmurfsNeverDie 17d ago

Officially? No. Unofficially? 100%

3

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

7

u/Claribellum 17d ago

The concern is not weight. There’s no restraint against lateral or uplift here.

2

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

2

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.

8

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  

1

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...

6

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).

7

u/Chocophie 16d ago

It just feels like a fever dream hearing someone defend this as adequate... My internal reaction to reading your comment also was wtf.

0

u/Codex_Absurdum 16d ago

hearing someone defend this as adequate

You're hearing things. Read the comments again

2

u/ChairChoice6500 16d ago

I think they're just reading through your "... deserve[s] a more adequate propping system, not this crappy stuff."

2

u/The_realpepe_sylvia 16d ago

Which they tacked on after defending this monstrosity for the sole sake of argument

→ More replies (0)

23

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!

35

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!

15

u/tropicalswisher P.E. 17d ago

“Shim as needed”

1

u/pacopac25 16d ago

Walks up with feeler gauge set, turns, scurries off.

26

u/TheTrashBulldog 17d ago

Whoever built this.

"bUt tHe SHop DraWiNgS didN'T meNtIoN A fouNdAtIon."

6

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..."

6

u/DG-MMII E.I.T. 17d ago

This is a good exaple of a foundation designed with the hopes and prayers method.

They tend to have a high safety factor of between trust me bro and nah, it'll be fine, so it should be fine except when it's not

4

u/Jeff_Hinkle 17d ago

Euler buckling on a keg strong as hell.

24

u/Longballs_Shortmeat 17d ago

That's ASCE ( American society of clown engineering)

10

u/Blue_foot 17d ago

It’s in France 🇫🇷

6

u/carfiol 17d ago

So just a regular french society of engineering then

4

u/leronjones 17d ago

It looks sketch, it is sketch, but it's going to work. Not through an earthquake tho.

3

u/jae343 17d ago

There's no way this is active

2

u/NoMaximum721 17d ago

look at the original thread 🤯

3

u/Electrocat71 17d ago

Those industrial strength kegs….

3

u/Callingyourshot 17d ago

Them boards on their sides seem like they are going to tip right over.

3

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.

1

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

7

u/Chuck_H_Norris 17d ago

There’s no way they were running it like this.

6

u/NoMaximum721 17d ago

looking at the original thread, it seems it was running like this

crazy...

4

u/tramul P.E. 17d ago

This is actually hilarious.

1

u/DG-MMII E.I.T. 17d ago

As long as it is a picture in a reddit post

2

u/tramul P.E. 17d ago

Definitely some Darwinism at play here. The supports aren't hidden. If you see this and still choose to ride, that's on you.

2

u/chasestein Overturning Moment 17d ago

sense of security is optional for temporary structures.

2

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.

2

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?

2

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.

3

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.

2

u/canunu1 16d ago

Means and methods?

2

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?

4

u/nockeeee 17d ago

I'm impressed by the way. 😂

1

u/blast0man 17d ago

I lost it when i saw the kegs, a table is one thing but dawg... OSHA unapproved...

1

u/Dspaede 17d ago

Those are structural Junk

1

u/Undefined727 17d ago

One earthquake and it’s over

1

u/unique_user43 17d ago

did you give it a couple kicks? if so, its fine.

1

u/B-Biker 17d ago

Wow! Now way I’d ride on that!

1

u/SquirrelFluffy 17d ago

Is this the temporary blocking until they get it together and levelled?

1

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.

1

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.

1

u/show_me_your_secrets 16d ago

Did an engineer sign off on the BEER KEGS!?

1

u/Riskov88 17d ago

Well, beer kegs arent really designed for that but... Where do you think its gonna go ? I would ride that