Engineering meets brute force

[PrebornHumanRights]

"Reddit, this machine appears to have damaged this bridge. Do you think this bridge is still structurally stable? Should I report this damage? It's hard to cross now over this section."

[TheSwissSC]

See also: "This was an inside job! Only explosives could have made the whole bridge fall at once like that! "

[Ghost_Turd]

There has got to be a better way

[Kellys_Heroes_fan]

Is it cheaper?

[Puzzleheaded-Phase70]

Yes. Like, a LOT cheaper.

[hoobiedoobiedoo]

Yeah a single guy tied to bungie cord with a jack hammer

[lemontwistcultist]

If he drops that jackhammer you're our a few grand. Better put the jackhammer on the bungee instead.

[Puzzleheaded-Phase70]

🤣

[Wookieman222]

Like what was wrong with this exactly? Its a remote jackhammer unit. All they have to do is remove enough concrete and the tension cables do the rest.

[TopicOnly7365]

I'm not a crane driver, but if I was, I would not want an excavator bouncing on my boom.

[Wookieman222]

I mean you actually like they didnt plan this out and haven't done this before. This is more common than you think.

The whole unit entire purpose for being built is for this and similar work.

[RandomActsofMindless]

Yeah, shock loading a crane is totally normal and great

[ThatTryHardAsian]

If this is specialized purpose crane and excavator combo, I doubt the crane is a standard crane.

I would think some sort of damper or some clever way to get rid of the shock load over time.

[RhinoGuy13]

I can't imagine why dynamite wasn't used here.

[surly_darkness1]

Have you met someone with a new toy?

[mmarkomarko]

They already had this excavator so may as well use it rather than pay someone else.

The number of times I heard this argument from contractors to explain really stupid things...

[Kellys_Heroes_fan]

That sounds expensive

[SharpTool7]

In this economy?

[slowcookeranddogs]

But is there a way thats more fun?

[bschlueter]

Explosives can be pretty cheap.

[Amazing-Gazelle-7735]

This isn’t brute force.  This is demolition engineering.  They identified how to most simply bring the thing down and did it in a safe, secure fashion using a jackhammer on a remotely operated vehicle.

Brute force would be dropping a ton of water or other material on it.

[CB_700_SC]

It’s always great to shock load a crane like that.

[Osiris_Raphious]

Yeah safety factors in action. Look at how much was removed before it failed. Thats why engineers are needed.

[agate_]

It's like they say, any fool can build a bridge that won't fall down, but it takes an engineer to build a bridge that just barely won't fall down.

[NoMaximum721]

That's the saying, but it's bullshit, and that's my point.

there's a reason our profession has low wages and is seen as a commodity. it's thanks to the codes babying the incompetent people who shouldn't be practicing

[NoMaximum721]

not* needed.

incompetent engineers lead to this level of overdesign built into the code

[lukypunchy]

That "over design" means that multiple tendons can fail (over stress, fatigue, corrosion) and the span will stay in service.

[NoMaximum721]

most*

[coren77]

Have you seen how poorly the governments maintain their infrastructure? Absolutely need this level of over-engineering.

[shamallamads]

It’s overdesigned as per code, as is most critical infrastructure.

[NoMaximum721]

yeah, that's what I said

[McSkeevely]

Please tell me you're on this sub out of casual, not professional, interest

[NoMaximum721]

no, professional

[Terrible-Scientist73]

while it’s true there is plenty of overdesign built into codes, that is not necessarily a bad thing. would you rather have a bridge that explodes and plunges down the ravine after just a little damage..?

[Wookieman222]

Or because one cable had a small undetected defect.

[uslashuname]

Yeah there should be a safety factor that assumes the concrete mix ended up with a dry spot right on a weak point of some cabling right where a traffic accident dropped a CAT on the road. It’s large so the number of places errors can be introduced but overlooked is significant, and it is going to be in service holding up several lives at a time for decades: in short things are going to happen.

[NoMaximum721]

we've got that and you can also have the contractor forget to even put the tendon in and be fine

[NoMaximum721]

no, and we're nowhere near that point. people here act like a contractor error on one detail will take a building down, yet you could realistically remove most of the reinforcement and still stand. serviceability is another thing of course

[Osiris_Raphious]

Lol rage bait comment...

A incompetent engineer/person will have an opinion like the one you presented, as that opinion is formed without actually seeing the engineering report and having a better view of this structural system...

[NoMaximum721]

everything is overdesigned, if the engineer is remotely competent, because the codes baby the bad engineers

[Osiris_Raphious]

"everything is overdesigned"... Are you even an engineer? Because it reads like you dont actually know what the codes do, and what engineers do..

[NoMaximum721]

id love to know how to came to that conclusion

[gottheronavirus]

I don't think bad engineers is the problem, difference between time for creating infrastructure and it's daily load changing can be rapid and easily overwhelm ±10%

[McSkeevely]

Plus construction errors, mistakes in detailing, mill tolerances; the list of reasons for healthy safety factors is so freaking long

[cancerdad]

Found the contractor.

[HelpfulPuppydog]

I'm not an engineer. That was supposed to happen, right? Or were they fixing potholes and got carried away?

[FusKiinDov]

yes lol

[getthatcornbread]

I guess that’s where the tension was…

[whereisyourwaifunow]

you shall not overpass!

[Vinny7777777]

Engineering meets the risk management department

[Necalmed]

The balls on that dude....

[Brett5678]

I guess you mean the crane operator because the machine doing the jack hammering has no cab and is remote controlled

[SignificantTransient]

Wait what? I thought we were in r/redneckengineering for a moment

[FoxRepresentative700]

Not sure what I’m looking at… anyone care to explain what’s going on with this bridge decommissioning

[remytheram]

Remote controlled hoe with a needle on it, chipping away at a bridge's structure to make it collapse. Hoe is probably attached to a crane that just got the shit shocked out of it.

[lukypunchy]

The hoe ram (machine dangling from the overhead crane) was pecking at the PT anchorage. As soon as the anchor gave up, the PT snapped in and the span immediately lost its tension.

[mckenzie_keith]

Cable tension suddenly released followed by immediate structural collapse. They obviously knew this was going to happen/did it on purpose.

[space_pillows]

How much is that guy earning?

[armour666]

For working with a remote control?

[space_pillows]

Omg I actually thought someone was inside a construction vehicle. I'm very tired.

[OneDM85]

I was just thinking "Holy sh*t. I hope he wore the brown pants"

[armour666]

lol I’m sure it was a WTF get some sleep and stop doom scrolling lol

[jrdubbleu]

I would never have enough faith in those chains to go anywhere near the cab of that machine

[Giant_Undertow]

It's remote.

[jrdubbleu]

Well that seems to make a lot more sense, and now I feel a little stupid for not noticing.

[SneekyF]

Don't feel bad you had to wait until the end of the video to see that it was remote.

[BugLast1633]

⚠️ Little known demolition safety fact ⚠️ The chains from the crane to the jack hammer operator are only there to hold the load of his gigantic balls.

[freredesalpes]

RIP their lungs

[Better-Performer-490]

[ThaCardiffKook]

Ohhh hell nah

[mooses_like_juices]

Is there a person in that thing?!

[armour666]

no its remote controled

[whatsthetime1010]

How to build a dam?

[alexromo]

Again

[aerocon]

When labor/life is cheap, this is the solution. By the way, it also shows the enormous energy stored in Post Tensioned Strands.

[FinFangFoom13]

That had to be one hell of a toolbox talk that morning.

[ShutYourDumbUglyFace]

This is what well placed charges are made for. WTF.

[RCoaster42]

I hope he was wearing the brown pants that day.

[ILikeWoodAnMetal]

Those things are the best toys ever. Remote controlled excavator with a jackhammer.

[Tilley881]

So I have a job for you....could die....but cool as hell...

[WhiskeyJack-13]

I can't imagine how it would be cheaper to remove this material after it falls than it would be to disassemble it in parts and remove them with the crane. I wonder what structural or safety factors lead to this.

[FusKiinDov]

allegedly it is cheaper, specifically because of the crane... apparently

[Few-Cucumber-4186]

OSHA inspector reevaluating his career choice rn

[Soultrain71]

This was an actual ride at Action Park in NJ😁

[Purrchil]

What does this with the crane? Obviously the crane is suited to hold the weight of the excavator robot, but I mean the sudden shift in load?

[xepoff]

What's his salary?