Why Cranes Collapse

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Practical Engineering

Practical Engineering

Жыл бұрын

Cranes are the backbone of construction projects. So why do so many of them fall down?
Because they are so pervasive and they do such a dangerous job of lifting massive objects high into the air, occasionally cranes fail. In this video, I want to walk through some of the reasons these failures occur, using historical events as case studies.
Practical Engineering is a KZbin channel about infrastructure and the human-made world around us. It is hosted, written, and produced by Grady Hillhouse. We have new videos posted regularly, so please subscribe for updates. If you enjoyed the video, hit that ‘like’ button, give us a comment, or watch another of our videos!
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This is not engineering advice. Everything here is for informational and entertainment purposes only. Contact an engineer licensed to practice in your area if you need professional advice or services. All non-licensed clips used for fair use commentary, criticism, and educational purposes.
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This video is sponsored by HelloFresh.
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Source: www.youtube.com/watch?v=U6fBP...
Producer/Writer/Host: Grady Hillhouse
Production Assistant: Wesley Crump

Пікірлер: 3 529
Practical Engineering
Practical Engineering Жыл бұрын
🏗 New to the channel? I have a lot more videos like this in my "failures" playlist: kzbin.info/aero/PLTZM4MrZKfW_kLNg2HZxzCBEF-2AuR_vP 🥑 Get some free meals from HelloFresh with code PRACTICAL14 at bit.ly/3wQlgvG
Aleksandra Kowalczyk
Aleksandra Kowalczyk 4 ай бұрын
In Poland there was a huge crane collapse.
LadyWeaselLou
LadyWeaselLou 10 ай бұрын
I wanted to try this but it wouldn't let me look at our choose meals until *after* checking out. I've looked in to this before and didn't care for the meal portions. My husband and I both work outdoor, physically demanding, very arguous jobs and these meals were not practical (we're not fat, in very good shape actually. I'm 32 and he's 52 and our work keeps us fit) but this is just not practical at all. I can shop at places like Save-a-lot and Aldi, get fresh fruit, veggies and meat and make us both large dinners with enough left over to pack as lunch the following day for what this place wants for a rather small meal that may or may not have what we like in it. It's a neat idea if you don't need large meals, have trouble leaving home or your sick or something (but even then, most places deliver groceries now). It's interesting but not for people such as us. Thank you though.
ProSpect
ProSpect 10 ай бұрын
because of gravity ?
dogefort
dogefort Жыл бұрын
Looked into doing testing on what playlist of backlog videos will best convert viewers into subscribers? A/B testing or tweaking that somehow should see more people getting a much needed STEM fix.
Big 'Un
Big 'Un Жыл бұрын
Grady, love your videos. Thank you so much!! PLEASE tell us where you get your cool crane models!!??
Linar
Linar Жыл бұрын
Looking at most cranes I'm always amazed how they DON'T collapse.
amp
amp 3 ай бұрын
maths!
Robert McGarry
Robert McGarry Жыл бұрын
@Samson Soturian He explains in the video that counter weights only work in two ways straight down and opposite the load. In air weight, usually used on horizontal extension cranes. I usually call weight added to the foundation ballast, usually used on folding and boom cranes. Yet, an average crane experiences at least 3 sometimes 4 forces. In fact, in air counter weights can cause their own problems. They increase the total weight of the crane which is not necessarily bad if balanced, but does lower the effective lift rating. Side to side tipping becomes a real issue when the wind blows, the extra weight just helps pull it over. In short, it takes an engineer to build one, and an engineer to operate one.
Qa38O
Qa38O Жыл бұрын
@MagicalBread yes lmao ty 😀😅
MagicalBread
MagicalBread Жыл бұрын
@Qa38O You mean a crane? 😂
Ash Kebora
Ash Kebora Жыл бұрын
@Churble Furbles A crane is only as useful as how much it can lift. (and how far and such, but...) So it kinda' makes sense that they'd both run up the scale _and_ run up the weight to the limit. Though clearly as cited in the video, you uh... kinda' still need _some_ safety margin...
Brian Shipman
Brian Shipman 11 ай бұрын
I have been a crane Inspector and Test Director for over 15 years. I find that in the early days, cranes were over built do to a lack of knowledge (engineering) and an abundance of labor and material. Today, cranes are engineered right to the edge. The benefit to the crane manufactures is that they can sell a higher capacity crane at the lowest possible expense. The problem this creates, however, is that there is literally no room for error. The slightest miscalculation is now catastrophic were it might have been absorbed by an older crane with an inherently larger safety factor. Additionally, profit of a project is inevitably tied to the speed work can be done and often has an inverse relationship with safety. Methods to "speed up the job" are often implemented at the cost of doing it as safely as possible. The willingness (known or unknown) to cut corners coupled with cranes built to the edge is a recipe for disaster.
Ian Chandley
Ian Chandley 28 күн бұрын
@travis w we LOVE them here in Jamaica!! An old employer has several “new” Krupp hydraulic cranes being scrapped for parts while the Limas that are 50-ish years old are still going strong (including one that I watched turn over about 16 years ago)….
Teesside man.
Teesside man. Ай бұрын
Bang on Brian. That is why Roman. Greek & Victorian structures are still In use safely to this day. Cranes!! Of old the same.
Richard Ross
Richard Ross 4 ай бұрын
In the 1970s, I was taught Allowable Stress Design. It gave an overall factor of safety of 4. In the 1980s, many engineers went to Load Factor Design Method which seems to be a factor of safety of 3. With older US made steel it was fine. Starting in the late 1980s, foreign steel started coming in to the US. Some of it was substandard and lead to failures. There is still substandard steel around and it can cause failures. In 2005, I was told about chinese steel that failed at 1/6 the design strength.
Jon Hohensee
Jon Hohensee 4 ай бұрын
Brian - DUE
travis w
travis w 7 ай бұрын
Old Lima cranes are proof of overbuilt. 4100 Vicon also. New cranes are no match
Than3Dane
Than3Dane Жыл бұрын
Lost my brother on a "crane accident" on Aug 31 2011, while working on the FN building in Copenhagen, there were a supposeded procedure to move the lifts when they needed to be raised, the workers used them to install insulation. Apparently in the year 2011, we don't have remote controlled lifts, he had to control it from the inside while standing half way into the container it was going into. Well, the lift wedged on the edges, which resulted in an overbalance on the container, soon after both the lift and my brother was dropped a couple meters down to the concrete floor below, the several ton lift landed ontop of him. . . Still trying to cope with it, still angry that safety and equipment weren't and probably still aren't up to date, especially on a globalistic prestige projects like that..
brandon shorkey
brandon shorkey 19 күн бұрын
@Than3Dane articles don't just disappear.
George Welker
George Welker Ай бұрын
I’m sorry about your loss. But from a corporate perspective it makes sense to keep older equipment in service for as long as possible. It’s not about safety it’s about margin and getting ahead
stephanie parker
stephanie parker 5 ай бұрын
I’m so sorry for your loss.. 😞
Mandy Robinson
Mandy Robinson 6 ай бұрын
Sorry for your loss, may your brother be at Peace with our Angel’s
Luke Arts
Luke Arts 9 ай бұрын
@Than3Dane Totally agree. The main responsibility is always with the person making wrong demands, i.e. the employer. But we also know that "Wir haben es nicht gewusst" doesn't fly as excuse... Just say "No" is always an option :) (That goes for everything, by the way... We all have the right to protect our own sovereignty)
The Real E.B.
The Real E.B. Жыл бұрын
"Bah, engineers always overdesign stuff. She'll hold twice that much, easy." -Construction Guys
Luke Arts
Luke Arts 9 ай бұрын
The OC used to be more or less correct, until everybody wanted the civi to lead the design instead of the industrial engineer because that would save money in materials. And then the CEO stepped in, and gave the design lead to an economist... :/
Induction by Force
Induction by Force 9 ай бұрын
@Dog Walker who the hell told you that don’t comment till you know anything they are tested to 15% and Tadano is 20% I myself have gone well over that but I know someone who had a boom break at 130% but inexperience played a factor as he could’ve shrunk the boom putting into tipping but that’s too much for most operators they just don’t understand
Neal Castagnoli
Neal Castagnoli 9 ай бұрын
yes and no. we once did a lift of a 12.000lb transformer. we all knew the crane was out of chart and were pretty queazy about the whole thing. later found out he was 15 feet out of chart and lets just say that wasn't a popular move by the operator amongst his co workers.
Conner O'Grady
Conner O'Grady 10 ай бұрын
@The Real E.B. you seem like such a pro 😳
theater of souls
theater of souls Жыл бұрын
hahahaha
James
James Жыл бұрын
"Presumably to speed up disassembly" And wouldn't you know, it worked! Fastest disassembly ever!
hdj81Vlimited
hdj81Vlimited 9 ай бұрын
@Tom Rogers What i tell him then? DO IT YOURSELF !!
Tom Rogers
Tom Rogers Жыл бұрын
Bring ‘ er down. Quick! OK Boss! Lazy bastards!
Matthew Noel
Matthew Noel Жыл бұрын
My career has included operating cranes as hefty as 240 tons and when this video started I was hoping to maintain the same respect for Grady which he's earned in other videos. Well, I respect him even more now. Every point was correct and explained so a newbie could understand it. This video alone could replace several training videos for new crane operators and make their workplace safer. Thanks Grady.
Steven
Steven 2 ай бұрын
@gerard . A yes you would know if you were a competent operator you check your manual and make sure it has the same serial number as the crane you’re working on that way there can be no mistakes.
Just a lone soul
Just a lone soul 6 ай бұрын
@al mai "Why wouldn’t you maintain the same respect for Grady off the bat on this video." Yup, to me as well, that sounded utterly arrogant and pretentious, and definitely dispensable.
Sam
Sam 9 ай бұрын
@Utube 1 does it really matter? At least it's explained correctly.
Christopher Anderson
Christopher Anderson 9 ай бұрын
@Casey Alan There's so many replies I have no idea who you've even replied to anymore haha
Casey Alan
Casey Alan 9 ай бұрын
You’re probably a real fun guy to have at a party
briansmobile1
briansmobile1 Жыл бұрын
Beautiful visuals and teaching examples!
wood works  paradise
wood works paradise Жыл бұрын
Working around cranes and boom trucks a lot in my life, this video is a great reminder, though its stuff we look at every day, good to have your voice in the back of my head, and the analytics of failures to consider. I dont operate, but as a ground guy, we often are the second eyes for the opperators.communication and awareness is very key to safety.
SmarterEveryDay
SmarterEveryDay Жыл бұрын
Really enjoyed this one
meet v
meet v 2 ай бұрын
A legend complementing his fellow legend friend
Rodolfo Perales
Rodolfo Perales 9 ай бұрын
Dope 💯
hooDio
hooDio 11 ай бұрын
let's get smarter every day
Ed Huzyak
Ed Huzyak Жыл бұрын
Dustin in the house!!! All my engineering channels coming together 😀
ArclightZRO
ArclightZRO Жыл бұрын
@Alex Deadeye it sounds like he is trying to get away from the wild fires
Veronica
Veronica Жыл бұрын
I was a first year student at the law school located at the site of the 2016 crawler crane collapse in Manhattan. Honestly even before it collapsed, we would have to walk underneath the crane to cross the street and it NEVER felt safe, and always gave a bad feeling. When it actually collapsed I sadly wasn’t even surprised. Condolences to all the victims in these accidents, it’s a shame their safety and life and well being wasn’t considered until it was too late. Thank you for an informative video!
Captain Quirk
Captain Quirk 17 күн бұрын
_Res ipsa loquitur!_
Chuck N
Chuck N Жыл бұрын
As a retired crane operator of 37 years I would like to say nicely done. I usually watch videos like this for a couple of minutes and pick them apart with all the miss information, not here. Looks like you did your research. I would say cranes are hazardous.......they only become dangerous when they are used outside of the manufactures guidelines or in most cases have incompetent humans involved.
Outis Tynnan YT
Outis Tynnan YT Ай бұрын
@Jaqui Greenlees okay, but, were they continuing to work when there were indications of winds? Winds don't just "appear," and if you're working in an urban area with wind corridors, you should be taking that into account. Theres no such thing as an "act of god," there should have been redundant safety to stop accidents
Arturo Eugster
Arturo Eugster Ай бұрын
@keta00 Good idea! Extend that to a gimballed rotor, able to compensate instantly: compensate for a lateral motion up there where the leverage is high and driven by angular acceleration, due to starting to tilt.This because mostly when they fall they tilt away and on the ground the lever is exceedingly small, the rotor is folded up and only powered up for critical tasks, electric driven with a large acceleration to rapidly correct for an unstable condition measured very fast. The rotors are telescopic with a light weight carbon fiber structure. Pre powered by an enclosed rotating momentum wheel, which via a clutch accelerates the extending rotor halves very quickly.
toyotasupra97
toyotasupra97 Жыл бұрын
Did his research? Doesn’t he engineer them?
Sean
Sean Жыл бұрын
@Felrin Kirla my favorite to tell my wife is PICNIC. Problem in chair, not in computer 😂
Felrin Kirla
Felrin Kirla Жыл бұрын
There's always a PEBCAC risk, or "Problem Exists Between Chair and Controls."
Paul Banionis
Paul Banionis Жыл бұрын
Currently I am in the process of taking OSHA 30 safety training. Interestingly enough, I am in the module on Crane safety. Great video!
The Arisen
The Arisen Жыл бұрын
I'd love to see you talk about modern Nuclear reactors and how safe the Nuclear industry actually is.
D N
D N 11 ай бұрын
It would go against Climate Czar Kerry's interest even while he jets around the world in a private jet not needing to be ran because hey it puts out more emissions per human and mile than the rest of us do as we ride in planes. The climate summit was attended by leaders from around the world and they showed up in 400 private jets. If they were willing to fly on a scheduled flight as most flying public does we could've got them comfortable into 2 passenger jets though they probably wouldn't have go along. Heard about it over on the PragerU KZbin channel. Alot of great content there.
James Harding
James Harding Жыл бұрын
Safer than coal and gas, that’s for sure.
Kamil
Kamil Жыл бұрын
I remember an accident that happen on the site a couple years back. We were assembling an STS crane in Bremerhaven using 2 crawlers. While lifting the machine house one of the steel lines snapped and the 50+ tonnes steel shrapnel grenade went flying down 100 meters. I remember the sound bolts made when they flew away from the crash, nightmare. Fortunately noone was hurt.
Garrett Ducat
Garrett Ducat Жыл бұрын
Perhaps in your next video you could touch on cyclic loading of crane failures. It is technically covered when discussing proper assembly, but I think it's such an interesting form of mechanical failure that's it's worth a special mention. Basically, if the bolts aren't torqued correctly then they can undergo cycles of tension and compression as the crane is loaded and unloaded. Proper torquing pre loads the bolts so they are always in tension and therefore not subject to cyclic loading.
Robert Antognoni
Robert Antognoni Жыл бұрын
Removing the pins definitely sped up the disassembly of that crane...
P Lopez
P Lopez 9 ай бұрын
@Imcons Equetau They were directed by the “lift direct” that was provided by the owner of the crane to remove the pins to help speed up the process on a Saturday to save money they are allowed to remove so many pins when disassembling. But unfortunately 40 mile an hour wind toppled the crane
BiwiHD
BiwiHD Жыл бұрын
Chef.
Allworkandnoplay
Allworkandnoplay Жыл бұрын
@MrBlackHawk888 he’s right
MrBlackHawk888
MrBlackHawk888 Жыл бұрын
@Jwanil Patel Keep me informed about that
Jwanil Patel
Jwanil Patel Жыл бұрын
@MrBlackHawk888 no one literally no one cares
Jake Riley
Jake Riley 9 ай бұрын
I’m a high voltage lineman in the Dallas area. I was working the storm on the Dallas crane accident you mentioned. We had several outages due to the winds that night. The reason I remember it so well is because basically no news stations reported the incoming storm. It came out of nowhere, it popped up North of Dallas and winds quickly picked up, if I remember correctly Addison airport had winds in the 90+MPH range. I’d guess the crane that fell into the building was left locked down like you mentioned. Nobody expected that storm.
peter frazier
peter frazier 11 ай бұрын
I spent 35 years in Ship Repair after coming out of the Forces. In that time I saw 5 crane failure's which resulted in 3 deaths. 4 of the failure's were due to overloading for the radius the jibs were at, the other one was high wind. It's a horrible feeling watching a Crane go over and knowing there is nothing you can do. I am 78 now and must say that the vast improvement in Health and Safety in the Western World has contributed to workers safety but we know that accidents still happen!
Richard Cranium
Richard Cranium 2 ай бұрын
@Chiara Coetzee At 20 miles an hour, radius and boom length should be reduced. At 30 the lift should be cancelled.
Chiara Coetzee
Chiara Coetzee 8 ай бұрын
High winds I can almost excuse as an unanticipated element but overloading for the radius seems like wilfull recklessness. There's no way any operator wouldn't know the load limit by radius, that's the most basic of all limits. They had to have been disregarding the limit, right? What kind of organizational incentives led to that?
comptoonman
comptoonman Жыл бұрын
Very thorough explanation of cranes, although I never worked in construction, cranes always fascinated me. It's disturbing to see how many accidents are caused by human error. I enjoyed watching your video, and anxious to watch many more. Thank you
Hubris Wonk
Hubris Wonk Жыл бұрын
I worked ground crew as a contractor with a construction company in 1990 when Big Blue was brought in to make a very heavy lift of a dome off a reactor in a refinery. We spent two months driving hundreds of pilings into the ground to shore it up for the lift. It took almost 100 truck loads to delivery the crane and a month to assemble the crane. The safety involved to make the actual lift was very thorough and every precaution was taken to ensure no harm to life or property. It is very difficult for me to imagine how the Milwaukee accident happened when considering my experience with Lampson and their crew.
Kris Johnson
Kris Johnson 3 ай бұрын
It all boils down to $$$. Stay on schedule. Stupidity basically. That same day big blue went down I was the #2 guy on a house setting trusses. I recall thinking how idiotic it was that we were swinging trusses that day. Then I heard of big blue and realized how right I was.
Babbler49
Babbler49 Жыл бұрын
Let me guess: you bought a bunch of construction toys, and then you realized you needed to justified your purchase, so you thought up this series, right?
Nikolay Vasilev
Nikolay Vasilev Жыл бұрын
@Emil Fladstrand But I don't wanna pay the tax
Emil Fladstrand
Emil Fladstrand Жыл бұрын
@Holowaty Vlogs I just really wanted it
Thuy Le
Thuy Le Жыл бұрын
He has toys in all of the video's I've seen from him. Prob "borrowed" from his son 😂
Joshua Nash
Joshua Nash Жыл бұрын
"Don't tell my wife"
Tim Hill
Tim Hill Жыл бұрын
They're not toys, they're to-scale miniatures!
J J
J J Жыл бұрын
As a retired Ironworker I think this video is very informative. I enjoyed it and I must say as a super on large projects in NYC most if not all cranes that fell where do to human error. I am also a rigger and in the past riggers have a license to set up cranes and insure it is done properly. Today a lot of them on concrete buildings are put up by laborers that hire a licensed rigger to oversee the project and that is where the mistakes come into play. Most Ironworkers know the safety and proper installation of tower cranes and most cranes. A plan is devised and the oversight of such a operation is crucial to be able to ensure proper building techniques in regards to tower cranes. The operators for tower cranes in NYC are smart and hard working men and women but the team as a whole need to be on top of their game so the operation of these cranes can be done safely. This is why in the past most cranes where put up and taken down by Ironworkers Local 40-361 in NYC.
Curious Investigations
Curious Investigations Жыл бұрын
I love your forensic analysis videos. There have been several large explosions/fires at propane tank companies in the past 10 years. It would be interesting to get your take on how they got started and what happened. The difference between propane gas escaping and burning and a BLEVE.
Lou Slade
Lou Slade Жыл бұрын
A fun fact about Miller Park: during construction, steel I-beams were set out for the public sign. My parents did that, so there's a beam in the roof somewhere with their names on it. :>
bryan reis
bryan reis 11 ай бұрын
We learned so much about the big blue collapse in our apprenticeship. Three of our ironworker brothers died that day. Thank you for such an informative video!
Nondescript
Nondescript Жыл бұрын
Including the "X people died and Y people were injured" after every example of a fall was very powerful. The near ubiquity of a non-zero casualty rate after each collapse really hammered in how consequential each lesson was. Sobering, dramatic, and respectful.
Cookson On Drums
Cookson On Drums Жыл бұрын
X people? they’re called the X-Men
Noble Herring
Noble Herring Жыл бұрын
There's a reason they say regulations are written in blood, after all
Blake UFO 🛸
Blake UFO 🛸 Жыл бұрын
HI Grady, Im a rigger and would love to see more episodes on rigging from the engineers perspective,,, particularly loads , loading, and any other thoughts on ground , prep, assesment, risk mitigation... just some ideas love the vids awesome content,,,
Muskiet
Muskiet Жыл бұрын
Great video. One thing to note is that unlike most situations where you can reverse an action and correct a problem before it gets out of hand, with a crane this usually isn't possible. If a crane starts to go, it will only keep going since the length of the arm is increasing as it falls.
Charles Crawford
Charles Crawford 11 ай бұрын
Does the speed of lifting or unloading heavy loads have an influence on the stresses developed in the boom structure? In other words, should large loads be lowered a specified rate to avoid a tugging action?
Георги Ставрев
Георги Ставрев Жыл бұрын
I really appreciate the editing and animation on this one, really well made!
Aaron Moore
Aaron Moore Жыл бұрын
After a 10 year career in crane engineering, I know how easy it is to get even basic crane content dangerously wrong. I started this video fully expecting to be ranting afterward. But, you did an incredible job and has me sending this video to our training people. Bravo.
Richard Cranium
Richard Cranium 2 ай бұрын
@Peet Ky a telescoping two section stick boom truck will work for what you’re attempting to do. You can do it the old fashioned way by setting the truss ends on the top sills and have someone on the ground use a pipe or 2x4 to help raise the top of the truss up.
Sean Brogan
Sean Brogan Жыл бұрын
Crane content
E
E Жыл бұрын
@Dominic yeah, why call the best trained, safest in the industry when you can get some scab outfit that half the time stumbles through and gets it right.
Peet Ky
Peet Ky Жыл бұрын
@360magnum thanks
360magnum
360magnum Жыл бұрын
@Peet Ky rent a telehandler and use proper rigging
dabajabaza111
dabajabaza111 2 ай бұрын
These videos are fascinating and you're a wonderful host. It's so nice to not see catastrophic events dramatized and instead focus on the practicality of what went wrong.
SonicGirl4Ever
SonicGirl4Ever Жыл бұрын
I worked at Manitowoc Crane as an intern, and one of the first things they show us as part of safety training is that "Big Blue" crane collaspe at Miller Park in Milwaukee. Very sobering.
Alfred Humperdink
Alfred Humperdink Жыл бұрын
I appreciate the effort that went into this video. Good job!
Phil Price
Phil Price Жыл бұрын
Excellent presentation. Someday maybe we'll have pocket devices to determine soil bearing capacity. Until then variables will always be a risk as sink holes and soil shift are not visible issues in advance.
Donna McCann
Donna McCann Жыл бұрын
Grady, I watched many episodes of Modern Marvels over the years, and I always wished someone would do something similar, but more in depth and with more of a science and engineering analysis. This is exactly what your videos do! Thanks for making them.
Winds of March Journey/Perry tribute band
Winds of March Journey/Perry tribute band Жыл бұрын
@Penoatle Love that show.
Penoatle
Penoatle Жыл бұрын
I have "acquired" Engineering Disasters. I listen to them nightly before bed. Sadly it is the same uploads that are being put onto this website, including 10 with the bad audio. I cannot seem to find 7 and I consider it "lost" media.
Todd Kagler
Todd Kagler Жыл бұрын
@Arvin B I do not like the new format of that show. I still watch the old ones regularly even though I know most of the scripts by heart. Awesome series.
marcelleskr
marcelleskr Жыл бұрын
💯 me too
Arvin B
Arvin B Жыл бұрын
Modern marvels was an excellent show with great narration. Miss it
fiddyscent tupacksaday
fiddyscent tupacksaday Ай бұрын
Just found your site today, AWESOME. I have been involved in heavy industrial construction and maintenance for 25 years and running. 3 trade certifications and years of experience but I still love learning many new things everyday. Nice to see a clear and concise mode of communication. Well done.
Arrested Effort
Arrested Effort Жыл бұрын
I remember when I was young, I witnessed a crane in downtown Toledo, Ohio wobbling back and forth. It concerned me, but we were over a couple blocks away at the time, and left soon after. Later that evening, as we were watching the news, the big headline that night was about a crane collapse in downtown Toledo. That same crane I had seen swaying only mere hours earlier. If I remember correctly, I think one or two people may have died in the collapse. It's still crazy to think that I witnessed the crane shortly before complete disaster occurred though.
iamdarkyoshi
iamdarkyoshi Жыл бұрын
Your videos are incredibly well done. Easy to understand visuals go a long way!
Glen McCabe
Glen McCabe 3 ай бұрын
Another brilliant video, thanks Grady! First time commenter here. As well as expanding the tipping line, another reason to use outriggers is that they are (presumably always) bolted directly to the frame of the mobile crane. Without outriggers, the vehicle's suspension will take up the load, and it will naturally settle to one side. Having outriggers directly connected to the frame removes this issue and makes the crane more stable... ...but then again, what do I know? I just translate crane manuals, I've never actually used one! I'm happy to be corrected by the pros :D
Creator Ryan
Creator Ryan Жыл бұрын
My father passed away in a crane accident due to negligence and vertical deformation. I appreciate your video bringing more awareness to the preventable danger of cranes
Demon n the sn0w
Demon n the sn0w Жыл бұрын
Sorry for ur loss.
Patrick Bailey
Patrick Bailey Жыл бұрын
Very instructional content as usual, Grady. Thank you!
E=Mc2
E=Mc2 Ай бұрын
Thanks for creating and sharing this episode! I travel a good deal and in major cities you always seem to see cranes in work. If I have to pass close to the area, I worry, "will this thing come down?"
Yashsvi Dixit
Yashsvi Dixit Жыл бұрын
To me cranes have always looked precarious and fraught with danger of tipping over
Joe Jenkins
Joe Jenkins Жыл бұрын
As a crane operator you did a great job with this video in my opinion, and when you showed the photos of the computers in the cab those are really familiar because I used to run a grove GMK series and now I’m running a Tadano ATF series 👍
Joel Peavy, FWS
Joel Peavy, FWS Жыл бұрын
I'm an electrical engineer, but Grady makes civil engineering so interesting it almost makes me want to be a civi... wait, what am I saying?! These are the best civil engineering videos on the planet, with Grady's calm demeanor, clear explanations, and awesome mock-ups being key. A+
Richard Ross
Richard Ross 4 ай бұрын
I was in graduate school 40+ years ago getting an MSCE. I was working with one of my professors cleaning his concrete lab and we looked pretty dirty. His oldest son and I had been in the same squad in the Army years before so he treated me like one of his sons. When we were done, he chuckled and said that as Civil Engineers we had the most fun of all engineers. We got to play with dirt, water, steel, timber, and concrete. Most of my career, I had a good time designing and building roads, bridges, buildings, and management systems. My son became an electrical engineer and doesn't like it. Good Luck, Rick
One Sad Tech
One Sad Tech 8 ай бұрын
@magnus hem Only one way to find out! Pick a topic and start recording! 😁
Bmendonc
Bmendonc 9 ай бұрын
As a chemE, it's very interesting to see the other side of planning a plant and the thought process behind the systems we just roll up as assumptions
sabretechv2
sabretechv2 11 ай бұрын
@magnus hem hahahahahahahaah
Nirabhra Das
Nirabhra Das Жыл бұрын
Exactly. I'm a game developer. These videos make me wonder why I didn't go for Civil Engineering rather than IT in college!
marcus green
marcus green Жыл бұрын
As a crane operator for 14 years you did good on this video I was looking for anything wrong but didn't notice anything
Mikie
Mikie 9 ай бұрын
How do you like your job?
avalanche15301
avalanche15301 Жыл бұрын
Love how you and your family are together. Makes me want to watch even more! keep it up man!
Drean
Drean Жыл бұрын
I still remember driving past Miller Park after the crane fell when I was little. Pretty cool that you mentioned Big Blue (:
Center of Troy
Center of Troy Ай бұрын
I was in Seattle when the google tower crane came down. That was no sudden wind. It was a downright storm. The fact that they unbolted the crane was absolutely nuts. They had more than enough warning. The wind was strong that day, blowing me over when I crossed between buildings.
Givrally
Givrally Жыл бұрын
There's a crane right above my apartment. Love how this starts with "Let's walk through some of the biggest crane disasters in history" 😂
P RO
P RO Жыл бұрын
@GloomGaiGar Won't do any good. Most foremen have done the jobs they're overseeing and understand things, but the same cannot be said of those in higher positions, and it's those higher positions where the pressure comes from. In the US almost never do the people who initiate the chain of events which result in failure ever suffer more than a small financial loss over it. If we start making them personally pay for their mistakes and add some jail time for them to think about how they lost touch with reality to increase their wealth then maybe things would change for the better. No hope for it until then.
GloomGaiGar
GloomGaiGar Жыл бұрын
find the foreman, make him watch this video
Jumping Fan
Jumping Fan Жыл бұрын
@Jonathan Bush but others may have been boarding.. and maybe he had a round trip.
Jonathan Bush
Jonathan Bush Жыл бұрын
@Ken More At least they waited until you landed.
Ken More
Ken More Жыл бұрын
It's like having airline disasters being shown at an airport. Seriously, after I landed in North Dakota, they had an airline disaster video loop playing on the monitors! What?
Dwight Mansburden
Dwight Mansburden Жыл бұрын
Grady seems like such a genuinely nice guy- it’s too bad this video introduced me to a phobia that I never knew I had lol
NorthPlayyyer
NorthPlayyyer 9 ай бұрын
I have worked with tower cranes everyday for the past six months and you get used to them when around them all the time. Also it's fun to chat with yhe operator on a walkie talkie while on breaks etc. Superfun work i think!
TassieLorenzo
TassieLorenzo 10 ай бұрын
@Animation Space Really? Cranes are usually everywhere in the central business district (downtown).
Animation Space
Animation Space Жыл бұрын
I find it unlikely that you are walking under cranes, let alone cranes at breaking point to failure often if that helps
Kelsey Hann
Kelsey Hann Жыл бұрын
this was super interesting! a crane collapsed in my city a few months ago. would love to see a video on the kelowna crane collapse once there’s more info!
RA9
RA9 9 ай бұрын
Omg, I absolutely enjoyed every single moment of your video. Very informative and straight to the point without a bunch of technical stuff. The family video at the end just warmed my heart. First time viewer but won't be my last. Thank you sir and have a wonderful day.
Mac McCauley
Mac McCauley Жыл бұрын
I had a view over several construction sites when High winds suddenly arose. At least 2 of them were lifting large heavy flat wall segments. One got theirs down fairly quickly, while the other had a very limited space to lower it. You could see the Urgency as the workers tried to balance the need to get the load off the hook, while also not causing any initial damage/injury. Hadn't really appreciated the amount of factors that need to be taken into account till then.
Colton Dodd
Colton Dodd Жыл бұрын
The fact that this guy always has custom props for all of his vids I’ve seen so far is impressive
micko lesmana
micko lesmana Жыл бұрын
it is passive ability of engineer, you will always found a material to prototype on
Tomas T
Tomas T Жыл бұрын
you buy such toys for the kid that you can play with them too. men are just overgrown kids but in the good side of it.... i bought me a lego technic when i was 30 :D:D
darlingicarus
darlingicarus 11 ай бұрын
Wonderful video. Your practical demonstrations really add so much to the explanations! Also i don't think I've ever seen a sponsored segment that I would describe as "adorable" but you've managed it somehow! Wishing you and your family a wonderful 2022.
Captain Quirk
Captain Quirk 17 күн бұрын
Yeah, I always skip through those ads -- but not this one! 😁
Robin de Jongh
Robin de Jongh Жыл бұрын
Thanks Grady! Your demo of the soil particles for ground failure in particular was amazing.
KEVIN NGUYEN
KEVIN NGUYEN 7 ай бұрын
Love your videos. Really helps me understand the civil engineering concepts when I study for my architectural exams toward my licensure. Thanks
Elizabeth Luca
Elizabeth Luca 11 ай бұрын
Excelente trabalho. Aprendi bastante enquantoum leigo amante dos guindastes. Parabéns!
Adam Lauina
Adam Lauina 9 ай бұрын
Nice video. Also, big respect to all especially the crane operators. Knowing something can go wrong every time you go up.
ÿÿÿ ÿÿÿ
ÿÿÿ ÿÿÿ Жыл бұрын
Well researched episode. Good job! I would like to add that in a load chart there's a stair like bold line separating the chart into two sections. Anything above the bold line is for structural strength; anything below is for stability. I was surprised that some operators didn't even know this. Another comment is the video should also include shock load as another frequent cause of accident. One observation back when I was working on load moment indicators: many manufacturers claimed the LMIs came with a "black-box" feature (event recorder or data logger), which was supposed to help engineers reconstruct the last lift in case of an accident. It's nothing but a cyclic recording of CANopen messages on the CAN bus with timestamp. However, I can't figure out the sequence by just looking at the recording. Simply put, my interpretation of the event never matched what had happened. Clearly more work needed to be done to make this very important feature useful. Coincidentally, there was a crane accident in Washington DC involving a mobile crane. In the investigation report it stated that the 'black-box" wasn't reliable enough to help the investigation.
bisiilki
bisiilki Жыл бұрын
This is such a great channel. Simple to understand explanations for complex concepts! 10/10 would recommend.
Aphex
Aphex 5 ай бұрын
We're getting into cranes, as one of the projects using Aphex has Big Carl out and about, and another has 8 tower cranes popping up over the next few months. Grady, your videos are excellent and we can't believe it's taken us so long to find you!
stanthology
stanthology Жыл бұрын
9:23 I read an article about the sports stadium crane in Brazil years ago. It was a massive crane like a Liebherr LR 13000. In the article it stated that the slave driver wanted to save time by not putting the mats down for the crane to spread the load on. The load was a huge roof section. The data recorder for the crane was also disconnected. (like a black box on aircraft) Therefore there was no way the manufacturer would be able to analyze the forces acting on the crane etc. And of course , liabilities.
ernest mathews
ernest mathews 4 ай бұрын
So nice to find out how things happen. You make things clear. It's always treat to watch your content.
Steve Jones
Steve Jones 11 ай бұрын
I've always wondered how a tower crane can manage to go from unloaded to loaded, without falling over forward. Obviously there are counterweights on the opposite side of the beam, but that just makes it seem to me that when UNloaded the crane would have the potential to fall over backward. I had always assumed that the counterweights moved in and out, closer and further from the fulcrum point as the load being lifted is added or removed to keep balance, but in this video, in some of the closer shots of the cranes, it doesn't look like this is possible. Isn't this a seriously restricting aspect of the loading of any crane of this type?
Robert Erbes
Robert Erbes Жыл бұрын
Awesome video. Big blue was was shown to me in my training classes. The main operator declined the lift due to conditions so they had a back up operator do the lift. Don't know how true that is but it's a shame if so.
1nm1
1nm1 9 ай бұрын
As you stated the main operator REFUSED to do the lift due to the wind (props to him!!!) As a result, the superintendent took over the main operator's job and did the lift himself. While the effect of the wind on the CRANE itself was accounted for, they FORGOT to account for the effect of the wind on the LOAD. It also was the HEAVIEST / LARGEST LIFT the crane was scheduled to do at that project, so an unexplainable oversight too. I remember it well because our family drove by the construction site the weekend BEFORE it collapsed. The stadium is right off the interstate and I think we got off and drove into the parking lot & looked at it. The video showing the crane collapsing on a GIANT sports stadium completely fails to give the viewer ANY REAL idea of the size & massiveness of that crane. It was a giant of a crane (one of the world's largest at the time). As soon as I saw this video, I wondered if Grady would mention it and he did...
Rik MaxSpeed
Rik MaxSpeed Жыл бұрын
Having witnessed a 400 ft crane collapse in Canary Wharf in 2000, it certainly brought home how absolutely massive some of these can be. Cranes might look tall and slender from a distance, but the size of the tubular beams and frame structures are terrifyingly huge when you see them brought down to ground level.
Ranalla651
Ranalla651 Жыл бұрын
I am an auto technician but love your videos. I like details and your models. Keep it up!!
Effen Fish
Effen Fish Жыл бұрын
a good root-cause analysis of crane failures. seeing the family at the end was an unexpected treat!
edopizza
edopizza Жыл бұрын
14:38 The peel of the lime is creating a bowl which does not allow the juice to freely sip down. In an engineering point of view, it is best practice to rotate the tool by an angle of Pi on its long axis.
ATAG_Flare
ATAG_Flare Жыл бұрын
Recently a crane collapsed in my province. Thanks for explaining why these accidents happen!
Rhys Hugill
Rhys Hugill Жыл бұрын
The Deme Orion crane incident is also an interesting event. A faulty hookblock caused massive amounts of damage to the entire crane structure and caused an expensive delay of the Vessel
Lee Brooke
Lee Brooke 10 ай бұрын
I enjoyed the video very much. As a DYI guy I have lifted moved and helped others do the same to items up twenty tons. Puny to a crane operator but still formidable at ground level. The understanding of platform stability, center of gravity and the safety factor have helped me keep my fingers and toes as well as keeping those around me safe. Again this is an excellent presentation! We use “ Hello Fresh” and recommend it to all our friends.
Guido GT
Guido GT Жыл бұрын
Very interesting. I look forward to watching the crane series. Thanks!
Jezack R
Jezack R Жыл бұрын
I love your vids, so well presented and informative. But the best thing about them are all the props! I adore your props!
pkav8tor
pkav8tor Жыл бұрын
What you did not mention was the influence of pressure to "get it done" that forces operators to push limits to the max leaving no room for unseen errors. As in the Lampson Crane in the last example. Running max load and pushing the wind max load without leaving any room for safety. How hard was management pushing?
Chiara Coetzee
Chiara Coetzee 8 ай бұрын
@I reckon I can build that I feel like there had to be a way to break the section into multiple pieces and install them separately.
1nm1
1nm1 9 ай бұрын
In the case of the collapse of Big Blue, they NEVER figured out the wind effect on the LOAD (they ONLY figured out the effect for the crane). If they had done the actual calculations for the load, NO one would have attempted the lift that day.
Ethan Schaefer
Ethan Schaefer Жыл бұрын
@Keith Broom where did you get this info? The only thing I can find is one guy maybe objecting to the lift and three companies fined a total of 500k.
Nico Nico
Nico Nico Жыл бұрын
@I reckon I can build that wait for the wind to stop.
Jack Poage
Jack Poage Жыл бұрын
@Simon Tay They would probably let him walk and hire another operator who will do anything for pay because his truck is about to be repossessed.
Emma Acquah
Emma Acquah Жыл бұрын
You always continue to amaze me with your loads of knowledge and professionalism. As a young civil engineer, I always learn something new and helpful each time. Keep up the good work sir 🙏 ( and your crew)
Tom Rogers
Tom Rogers Жыл бұрын
Definition: “Civil Engineer”. A professional who is extremely polite while laying your sewer and waterlines beneath a new bridge over the river.
m1k1a1
m1k1a1 Жыл бұрын
I still remember the sound of a tower crane falling near my apartment. I had never heard a sound like it, but I guessed what it was even before I reached my balcony. Unfortunately the operator died.
sunking2001
sunking2001 Жыл бұрын
Very good video! It's all about physics, having competently trained operators, and having the operator fully understanding load charts. I'm a small hydraulic crane operator in California. To get my certification I had to go to my trade school (Operating Engineers Union Local 3) and prove I could read, understand, and apply crane load charts...before I was awarded my CCCO. I've seen numerous videos here on KZbin of operators "not knowing what the hell they are doing." I would guess 99% of all crane accidents are "human error"...any way you want to look at it!
Mr. B
Mr. B Жыл бұрын
Always enjoy your videos, and send them to our kids to learn from. Thanks!
Arlen Addison
Arlen Addison Жыл бұрын
Me, a 25y/o wildlife biologist who knows absolutely nothing about engineering: “Well of course slew ring failed, they used the 12 ton counter weight instead of the 8 ton weight!”
Arlen Addison
Arlen Addison Жыл бұрын
@kiwibob 🇺🇦 We mow big a big tractor with a mow width of around 12ft. We have two bison but they're kept in pins. We leave the cut grass there as fertilizer. We have hundreds of acres of prairie so that would take a lot of bison & bison aren't entirely people friendly. We mow half the prairie every year so every acre gets mowed once every two years. That's except for the firebreaks that divide sections of prairie. We mow those every few weeks & keep them short. They're about 40-50 feet wide & divide the prairie in 20-30 acre sections that make management easier & would slow down a possible wildfire. And I like my job lot!
kiwibob 🇺🇦
kiwibob 🇺🇦 Жыл бұрын
@Arlen Addison 😯 " Mow the prairie" I can tell you this is the first time I've seen this sentence in my life. What do you do with the cuttings? How many man hours does it take? Wouldn't it be easier to buy bison ? How much do you love your job ? 🤯
Mas Baiy
Mas Baiy Жыл бұрын
Actually it can be done if you have turbo encabulator installed.
Arlen Addison
Arlen Addison Жыл бұрын
@kiwibob 🇺🇦 I work at a 2,500 acre nature preserve. Mostly its habitat management. We have to replicate the now gone environmental factors. Things like grazing by bison and elk & small wildfires the clear fuel load. We plant native plants, suppress invasive plants, mow the prairie once every two years to simulate grazing, and do controlled burns.
kiwibob 🇺🇦
kiwibob 🇺🇦 Жыл бұрын
What type of study do you do? 20 years ago I helped a friend with their study, catching all their critters, building their apparatus. Very stimulating time.
Taylor Ogden
Taylor Ogden Жыл бұрын
I work for a company that makes a specific mining product that is very analogous to a mobile crane. Very interesting to see how the concepts we use in our designs also apply to the big boys!
Department of Entertainment
Department of Entertainment Жыл бұрын
There was a crane that nearly collapsed near me a few years ago after high winds. The company had been having issues and hadn't been at the site for a few days so they hadn't disengaged the clutch and the jib was raised higher than it should have been because it was a small site and the neighbours complained about overhang. There was a serious storm and the crane was pointed directly into the wind causing the jib to blow over the top and point backwards. Everyone who lived within a couple of hundred meters was evacuated and had to sleep in the town hall and traffic was blocked for a few days while they tried to take it down.
TheBenjammin5150
TheBenjammin5150 Жыл бұрын
Ive been involved in many crane collapses in my life...some my fault some not. This video is spot on.
Ryan Hawley
Ryan Hawley Ай бұрын
Thats not something you wanna hear an operator say. Lol
Emin Muradov
Emin Muradov Жыл бұрын
Seeing how good of a family man he is and great content, one of the most interesting channels on YT
M1911jln
M1911jln Жыл бұрын
Back when I was a young civil engineer, I was given a couple rules to follow on construction sites by more experienced engineers. 1) don't walk under a crane lift if you can avoid it. As this video demonstrates, cranes can fail. You don't want to be under the boom or load if something breaks. 2) If you see people running, then run. Don't try to figure out why they are running. Don't look up (your hard hat gives you some protection from smaller falling objects, but only if you don't look up). Don't hesitate. Just run. Once you are safely away, then you can try to figure out why they were running.
Steve
Steve 11 ай бұрын
@M1911jln Not true. It Entirely depends on the terminal velocity of the bolt. Every object has a maximum falling speed determine by weight and shape (due to wind resistance as it falls) and once it hits that speed, it doesn't accelerate further. So if the bolt hits it's terminal velocity in the first 20 feet, it's going the same speed if you drop it from 20 stories.
Cole Logan
Cole Logan Жыл бұрын
@M1911jln I agree. Some protection is definitely better than no protection. Here's the video I was talking about kzbin.info/www/bejne/h2indaZ5hZusbs0
Winds of March Journey/Perry tribute band
Winds of March Journey/Perry tribute band Жыл бұрын
Instincts never fail.
M1911jln
M1911jln Жыл бұрын
@Cole Logan That depends a great deal on the height of the drop. A bolt dropped off the twentieth floor? Yeah, the hard hat isn't going to help. A bolt dropped of the second floor? The hard hat will likely help.
Andrew Harrison
Andrew Harrison Жыл бұрын
Always try and outrun the safety guy.
Willa Herrera
Willa Herrera 9 ай бұрын
I find it rather amazing how many cranes tip. One time a crane company was placing a mobile home on a foundation for us. Their spreader bar had about a 1/4 inch hole in the bar and that's right where it folded and the mobile fell right on the foundation. The picked it back up, placed it where we wanted it. They just had cracks to repair
wwb
wwb Жыл бұрын
Never mentioned that most load charts have 2 distinct sections.... stability (tips before it breaks), and structural (breaks before it tips). Also, the Miller park failure was not caused by dynamic loading.... it was simply side load due to the wind. The Lampson Transi-Lift was notoriously unstable side-to-side. I have nearly 40 years as a crane designer, specializing in structures..... crawler mounted and truck mounted, both lattice boom and telescopic cantilever boom machines.
Esteban Betancourt
Esteban Betancourt 4 ай бұрын
In my job site we encountered a problem where the foundation for the tower crane was elevated 3cm due to underground pressure coming from the continuous auger piles we were constructing. That same week a towe crane was overloaded and failed in the same city
JPR Photo & Video
JPR Photo & Video Жыл бұрын
When I had to engineer lifting jobs, I always had to look at the maximum ground pressure and add steel mats underneath the outriggers, if we were over the limit
Ted Fisk
Ted Fisk 10 ай бұрын
I watched two very tall buildings being built in downtown Chicago 2-3 years ago. Both had different types of cranes and all the cranes were assembled and operated safely. I watched them lift and place a lot of different types of loads from steel beams to hoppers of cement to outhouses. It was cool to watch.
Smeraldo DeRosa
Smeraldo DeRosa Жыл бұрын
Awesome, Grady. My wife watched this episode with me for the first time ever. Grimaced but loved it we especially enjoyed meeting your wonderful family.
Katya5cat
Katya5cat Жыл бұрын
Where I worked we had several cranes. On one occasion an operator was insisting on making a pick with his outriggers coming off the ground. Everyone was screaming for him to stop. He had to be threatened with loss of job to cease the craziness. He was just too far from the pick and shy some grey matter.
Timmy2Fingerz
Timmy2Fingerz Жыл бұрын
Can you do one on Fire Dept Aerial vehicle failures? They use some interesting mechanical advantage and have some interesting failures. Love the series.
Tommy Wheeler
Tommy Wheeler Жыл бұрын
I'm a crane op and most of these crane videos is regurgitated garbage from armchair operators. Not this one. Great video! Will be sharing with other operators and riggers!
Trendnwin
Trendnwin Жыл бұрын
I always drive by cranes in amazement. The construction of the crane vs how much weight it can lift does not compute in my head.
bob bobby
bob bobby Жыл бұрын
I personally knew one of the people killed in the 2019 Seattle accident. I appreciate your video on this topic since crane accidents hit a little closer to my heart.
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