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As a retired owner of a steel mill contact steel mill company I can say that these worker are cutting the pieces small enough to be able to be fed into an electric melt recycle steel furnace. They might use some of the same steel after it has been recycled to build the new bridge.

Being a near retired welder, you asked if they are cutting properly, yes they are. Best way is they have extended torch tubes, so they don't have to squat down.

I a welder that had 45 years of experience and I think they are doing a great job with this project 😊

Bro.... My dad had two years engineering at UW... Seattle....... his favorite thing to say to me after he told me something was ...okay explain it back to me with a few different words if you want ...but let me know that you understood what I was talking about .... And then give me a few examples so I even know more that you understood me. This proved to be invaluable to me all my life. Sir I really appreciate you taking time to explain things so clearly to everybody we need more people like you thank you very much. God loves us. We all have been through it with floating bridges in the state of Washington.... We just built a new bridge connecting State route 520 not too long ago. But the Hood canal bridge sunk and so did the one across to Mercer Island... And they said that the evergreen point floating bridge had to be replaced because it was too old. That's the one they just built... They built all the pontoons for it down here on the Pacific coast in grays harbor and then floated them all the way up to Seattle through the locks... And into lake Washington.... It was amazing how accurately each pontoon had to be..... made exactly like the other ones. Same weight same length same width same.height

Jeff, the cutting attachment on the excavator is called a 'SHEAR". They are cutting the metal up into 5 foot pieces because you get more money per ton from the scrap yard for doing so.

Imagine the amount of oxy/acetylene being consumed on this project. It boggles the mind on the sheer volume of steel being processed, the workforce, equipment. Thanks to all the trades that are working to clear and rebuild.

Ironically, the steel is being taken to Sparrows Point where it was made back in the 70's when Bethlehem Steel had a huge plant. Now being crunched up into pieces like the circle of life for steel.

Yes they are cutting the steel very well. That helmet/mask and respirator combination is the best that I've seen. back in the day, we would have been sent in with a short torch, a hard hat and some goggles. We would be expected to breath some of the fumes from the burning paint or fumes from zinc if it was galvanized.

One of the things I learned during my career as a crane operator doing a lot of steel erection, is that bolts in a gusset should never experience any shear force. That is why there are so many bolts, to create enough friction between the two or more pieces of steel so they can never slip pass one another. If the bolts ever experience shear forces then the gusset wasn't designed correctly.

the track machine has a demo shear on it for cutting steel in scrap yards and demolition site. The guys with the torches are cutters. Welders put steel together, cutters cut it apart. Very slow process cutting this much steel compared to what a shear could process. They have their work cut out for them either way.

I am a Boilermaker welder rigger from Australia 🇦🇺 those guys are doing a great job cutting up the steel. That bridge was definitely built well. It’s a shame that ship destroyed it. 🙏🇦🇺👨‍🏭

They are not Welders they are burners, the pieces are not being cut for inspection they are reduced to 5 foot or less sections as it is the optimum size for recycling

The "Grapple" you referred to is a Shear made by LaBounty , from memory they can cut up to 75 mm thick steel but the blades wear out faster that way , They have hardened steel cutting blades that can be unbolted and flipped over 4 times until they need replacing or sharpening. The hydraulic rams on the ones i serviced were over 400 ton of cutting force.

Steel is in excellent condition for its age. The paint is phenomenal. Those A36 bolts deserve our applause…as well.

Yes they are doing it correctly! I worked in heavy fabrication for decades. Did hours of demo burning of plates, beams, channels and angles of all sizes. We we're always cautioned about standing too close to material we were cutting up. We used long lanced burning and scarfing torches to extend our reach for safety. Steel members that are fabricated into different shapes, especially in building and bridge construction. Could potentially be under strain and once they are cut loose they can spring back at you. You have to plan your cuts and make sure your last release cut is close to your reach where you are in the clear and not further away. It was hard ,dangerous and hot work. I really miss it!

Great videos as always Jeff. FYI, cutting with a torch is not the same as welding. A cutting torch uses acetylene gas with if I remember correctly, a degree of pure oxygen to make a hotter flame. Once the metal is heated red hot, a stream of pure oxygen is injected through the center of the cutting torch which blows away the molten metal, thus making a cut. There is a trigger on the cutting torch that you pull to eject the pure oxygen through the center of the cutting torch. This process does not require the amount of skill needed to weld metal. Dark glasses are required to protect the eyes from the brightness of the flame.

Glad this guy acknowledges how well the bridge was built. He bad mouthed it in earlier videos😖 I drove to the salvage area and was told they are laying the bridge out as originally built as possible to study strengths and weaknesses in the design and construction before chopping it up for recycling. Impressive operation to behold

Thanks Jeff. You're adding great perspective beyond a single camera view - a behind the scenes look.

the bridge is a testament to a great design and American steel...... hopefully the bridge is replaced again in the near future. Hello from New Zealand

Thanks for the live stream Jeff. I was looking for something like that a couple days ago!

Don't know whether to curse or applaud how well this bridge was made. Amazing.

Thank you so much for your updates and the links you provided.... I didn't know there was a live feed of the progress.

Another excellent, well-explained video! Thank you for explaining what's happening on all these different, tragic sites in plain English, Jeff

These guys are cutting the steal with demolition torches, which has nothing to do with welding, nor was there any rivets in the steel. Nuts and bolts!

Very impressed with how fast the clean up is going. The Department of Transportation doesn't mess around.

Thanks Jeff for the update. Cool video. I’ve been on this bridge hundreds of times and I guess I took it for granted how this was built. So many memories. There were even many suicides from this bridge, the boy who lived across the street from me did this. Wow. Really hits ya.

Those 2 big yellow cranes you pointed out are rated for 200 tons lift each.The long boom crane further up the shipyard is only 50 ton rated with the boom almost straight up,and this its 50 year anniversary since it was put up.That boom on that crane is 257 feet long and was needed to reach across the super tankers that we built between 1974 and 1977 five in all 265,000 DWT's each.Lots of interesting things I saw during that period......memories that no one can take away

great coverage Jeff....keep up the great commentary

Nicely done, Jeff! Thanks!

Great footage and commentary. Thank you.

After nearly 50 years, the bridge has weathered well

Good work, Jeff!

The power of hydraulics is mind boggling!

Sparrow’s Point was for many decades the site of the huge Bethlehem Steel plant. My father worked there in the summers when he was getting a degree in mechanical engineering at John’s Hopkins University.

Love your channel! ❤

The U.S. Army Corps of Engineers is amazing. 👍🏼

After the sections are removed They are broken down in prep for recycling Once all the pieces have been inspected photographed and they have learned what they need to then they go to recycling

An old power plant was demoed by several of those claw machines several years ago on our river front in Henderson, KY. It took them about three months. Another old bridge was taken down not far from my home. After the new bridge was opened, they cut slots in the old, then used explosives to drop it in the river. They pulled out the pieces and cut them up just like in your video.

followed you on the surfside fl devastating event, it was captivating.

Excelente trabajo gracias por compartir tus conocimientos

I hope you win an award for your amazing work. Thank You!

That was cutting not welding. The arc flash was not present. Manageable stress on eyes.

Technically the gas 'cutting' is actually burning (iron + heat + oxygen = instant rust!)... Once the steel is heated via Oxyacetylene to near white hot by the flame you add 'excess' oxygen then the steel burns (releasing a lot more heat) and the 'cutting' action speeds up 😎

I've said it before, but the FIU Bridge Collapse video is the single best work you've ever done. From a structural analysis level, it's up there with Mario Salvadoris "Why Buildings Fall Down".

Great work again Jeff, what I'm noticing is you're a day or 2 ahead of the news outlets. Relating to this tragedy. I took some wielding and cutting torch classes years ago. It was great during the winter, but hellish during the summer months. They're pretty going to be cutting torches here. And other similar industrial devices.

Interesting..thanks Jeff

Great subject sir

Dang! 0:22 You have to appreciate the scale of that Hyd. Grapple and everything it takes to move it around 👍😎✊

Lots of good static & dynamic stress analysis samples.

Were rivets actually still being used in the 1970’s? It’s actually amazing how strong some of the structure was. Great analysis of many tragedies. Thanks!

Protecting the foundation must be a part of the bridge design; whether it be from scour or ships..

Every structure is only as good as its foundation.

Those pieces are not numbered so it is unlikely they are retained for investigation

In 1987 a pillar supporting a high voltage electrical transmission tower was hit by a ship in the Delaware River, down river from the Delaware Memorial Bridge. The tower collapsed with its high voltage lines. Fortunately no one was injured. The only problem was the lines were an important cross-tie between NJ and Delaware. The reliability of the grid was challenged until the tower was rebuilt and the lines rehung.

I wonder if people would buy a small portion of the bridge, which would go towards a memorial or whatever. Small enough to pick up or mail. A piece that had a rivet would be nice to have as a part of history.

Your background music on this reminds me Sims CAS music. 😂

That cutting arm on the Volvo digger is relatively small. They have one that is way larger, more than twice that size.

Excellent!

"I gotta get me one of these. Don't know what I'd do with it, but looks like fun!" Same!

When they raised the Tappan Zee Bridge in NY they cleaned the steal and concrete and barged it out off the coast of Long Island to build an artificial reef in the ocean .

I doubt very much they will learn anything new from most of those steel truss parts. The bits that will matter, are the piers, the protection around the piers and a few parts where the bridge connects to the piers. It's not as if the bridge failed in an unexpected way, it was just hit be a huge sideways force which it was never designed to withstand, and it was inadequately protected against this sort of scenario. I think the investigators will only want samples of critical parts and maybe a general survey to look for any more wide spread problems, like corrosion. Also, if they wanted a minute examination of ever part, in situ, they would surely not be cutting it up into bite-sized chunks. So there are three key points :- 1) what went wrong on the Dali, which is important, but kind of secondary to my mind in that infrastructure surely ought to be protected against forseeable events where practicable (and this was a very foreseeable event - here are plenty of instances of bridges either being brought down or being badly damaged by ships and barges). 2) Why was the protection inadequate to prevent a collision like this bringing down the bridge. There are, again, examples of newer bridges with much better protection against ships the size of the MV Dali. 3) The bridge also had a single point of failure. Could it have been designed to avoid that such that, even though damaged, none of the roadway collapsed, or failing that, multiple spans didn't fail.

Enjoying all the solar powered equipment used on this project

Can you get any video of the current state of the Dali bow to see how many containers have been removed?

I'd be nice to see a time lapse video of the removal process, I'm curious about the size of the superstructure pieces as they are craned off

that big orange frame thing you see at the offloading @ 0:45 could be an xray machine. i'm guessing they are learning from the stress points and how the metal stood up and what design points they can improve on future models. very cool making positivity from a bad experience.

Thank you

The touch on frictional forces is very interesting so I am asking here. Is this the case in bridges and buildings? Are the surfaces faces at the joints for bridges made such that the frictional forces in the vertical direction can be the primary force? Of course, to this interHack there seems to be more of a “sphere” type set of directions, so the bolts have to do something I guess. Any help or point to where I can learn more would be great.

Metal Grappling machine is called: a "SHEAR"....btw

What's the condition of the ship at the moment in cases like this? Are the engines running, is the crew still living on the ship, is it powered by some sort of auxiliary generator or is it just a floating shell? When they get the debris cleared, will it sail under its own power to a repair dock or be towed?

They could use the steel for a new Navy ship!😀

Getting the steel ready to make more kia replacement engines 🥺 good videos always

I’m surprised they don’t sell the parts to the public, I believe people would come from all over the world to buy a part of it. I would drive down from Bolingbrook Illinois for a souvenir piece.

3:44 - it's flame cutting (standard number: 81), which is a commonly used technique for cutting thick metal parts where precision is not important. They use a gas mixture for the flame (propane or acetylene + oxygen) that melts and even burns the metal, and a cutting gas (also oxygen), which blows out the melted and burnt steel (rather slag and oxide) out of the cutting gap.

Are the bolts of this bridge for sale ?

Ex journeyman ironworker here ... the BOLTS don't hold the weight. It is held by the friction between the plates.

I was wondering how they're doing with unloaded the front of the ship. Is it clear enough to get the bridge off of it?

When someone is welding, they are joining two pieces of metal together. These guys are using a Oxy Acetylene torch to cut apart metal not to weld it. Ron

The scrap without bolts needs to be just under 3 square. I think they are trying to knaw off as much from the sections where different angles come together and are bolted to get it under 3 foot square. However the bolts are different steel than the beams and plates and sometimes they don't want to mix that.

Do you know the tally of containers removed do far?

Lets hope they recycle the old bridge into caissons for large sturdy dolphins for the new bridge.

So who gets the money for the scrap and how much is estimated to be there? That's gotta be a healthy chunk of change. Thanks for these updates!

They're TORCHING, not welding, they're using a cutting torch, that's what us construction guys consider them doing. Usually, on big jobs like this they'll use liquid oxygen because it lasts longer and the tanks are larger. Some contractors like to use propane instead of acetylene because it's cheaper, but doesn't heat up as fast to begin to cut. Most likely they're cutting up the pieces into what the scrap industry calls prepared iron, you get a better price if you prepare the iron before you haul it in to the scrap yard.

Do you think there is a chance for the DALI to capsize???

That’s quite the cutting torch all I’ve used is the short version never seen those super long versions

Could They use two moble floating Docks on either side of the bridge and run i beams through the thrusesv of each bridge sections and float them up more level with the surface añd float a third dry dock under the bridge section and float up the bridge sections and cut up the bridge sections inside the dry Docks.

The bridge was designed and built when shipping coming in and out of the ports were 2/3 the size they are today.

It appears to me, that they're separating the steel to recycle it. If it has rivets and nuts and bolts, cut it out , and move it to another non-pure pile. Otherwise, you'll notice all the plain steel is in a large pile, and the small chunks with bolts in it, are in a different pile. Different grade steel(s) for recycling would be my guess. They're not separating it for the NTSB to reconstruct the bridge to see how it's built. They know how it's built, and how it went down. That isn't a mystery. They know it wasn't fastener failure, or grid failure.

The entire thing collapsed because it was built so strong.

Many years ago, one of an old saw mill in Thunder Bay was destroyed by a large steel sniper on job site . No welders and crew were needed. Every girdles were snipped into small pieces and a back hoe would pick up the pieces and drop them in the dump box . It’s too dangerous for cutters to cut apart the twisted beams. I see one worker got wiped 50 ft when a beam got cut apart. He did survived , but he quit the job. He said he still has 8 lives left when l talk to him .

What is so amazing is that the gussets held yet the bridge in the video collapsedlike tissue paper tearing.

1:19 😂That's all good steel scrap, it'll be worth some bucks

Imagine if the bridge designers had installed bumpers to protect the bridge Wonder what a few million dollars in protection would have saved

Surprised the site isn't crawling with workers. Should be pretty impressive once everything starts moving as everyone involved knows there is a rebuilding effort which could become absolutely massive once the (superfund) site is fully cleared. Definitely great news for real estate values there.

We can only hope the new bridge is built back somewhere near as good..

Getting a cherry picker mobile crane to assist the torch crew. Use a plate clamp to hold while cutting. Lift up enough so the torch doesn’t burn into rocks.

Live stream not available.

After the study I would love to have the metal to make a sculpture ! No machine could bend these shapes. I am also a certified welding inspector and have a masters degree in sculpture. I have one sculpture made from this type steel destruction. Lots of potential

Technique is spot on equipment is spot on these guys look like they have to be union ironworkers

TO protest the bridge piers, how far away would the pilings need to be? 50'? 100'?