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Jeff , I am sitting in my lounge half a world away from Baltimore, we don't see any of the work being done , so It is so good to watch your, and Capt Andy's video feeds and commentary . The work that is being done to release the ship and clear the site is phenomenal, and I appreciate being able to watch .
The shaped charges are shaped like a piece of angle iron. I've watched several of the videos that PBS had of CDI preparing structures for demolition that showed the shaped charges.
@Jeffostroff The blankets also act as 'tamping' that helps focus the explosion towards the target as well as reducing debris flying from the site. Often they use heavy things like sandbags or even bottles or containers of water to tamp an explosive charge so that it is pointed in a specific direction. I think that, in this case, they are just using the blankets and what looks like commercially made linear shaped charges. In the demo video segment about the controlled detonation, the charges depicted were the type that are basically a piece of angle-iron with plastic explosive packed into the inner corner in a fillet shape. The angle-iron is the main tamping element. That and the fillet shaped cross section of the explosive is the 'lense' that directs the explosion forward in a jet to cut the target. Its like they stretched the charge from an anti-tank rocket out in a line. There is no copper in front to make a projectile though. They don't need it because the charge is pressed right against the target. I am wondering how close their demo is to how the actual detonation goes. In the demo, all the pieces fall conveniently off the ship...
Like others have said, the black rectangles appear to be blast mats to mitigate the fragmentation from the explosive charge. If you look closely at time 3:27, you can just make out the copper looking rod that is the linear shaped charge they are using to cut the bridge trusses.
Agreed. Structures like this often look like a delicate latticework from a distance. Plus, as the bridge had no pedestrian access there were no people around give a better sense of scale.
Amazing how we ALL take thingscfor granted, isn't it? Nobody ever LOOKS at the things around us and appreciate the ammount of effort it takes to put them there, and to keep them there.
Thank you for explaining all this so we can understand what's going on as we watch it. I'm saddened by the deaths of the construction workers and I'm glad they have been found.
Controlled Demolition Inc out of Phoenix, MD is one of the best demo companies in the nation. Baltimore people should be very familiar with controlled demo. They turned high rises projects to dust before CDI went to NY for assist with the clean up of the world trade center. This has been an amazing journey with you. Thank you for sharing this time in human history with me - it is another chapter in my life in Baltimore book.
Jeff, I really enjoy your video's on the Francis Scott Key Bridge updates. They are very informative and helpful to explain how they going about removing the structure.
I think it's amazing how many good professionals they have brought in with almost no notice. It takes me longer than that to find a guy to fix my roof!
@@AshoreToo/ It just takes a large amount of money to get this kind of response......these contractors are like buzzards sitting around ready to pounce.
Always enjoy watching your analytical videos, you take an enormous amount of time and energy to assess these incidents. Just wanted to say, hello to you from the Isle of Axholme in North Lincolnshire, England
At all video I admire how clean, aka well-painted the bridge trusses are. If one looks at other bridges the dominant impression is rust. But here, I have still to detect any rusty spot. SO either they did the painting just the other day and/or are doing a fantastic job of keeping the bridge in good order.
Well spotted detail! It wasn't until I read your comment that I realised just how clean the bridge steel work looked. The trouble with a bridge like this one is that if you allow your maintenance program to get away from you, it then takes extra time and money to try and recapture it! Mark fromMelbourne Australia 🇦🇺
I don't know about this bridge, but I've heard that the Sydney Harbour Bridge in Sydney, Australia is being continually repainted - when they finish one repaint, they start again from the other end. It's over 90 years old now.... Suspect most large steel bridges are similarly under continual maintenance. (Greetings from Sydney, Australia).
Hi Jeff, I like your comments about the Baltimore bridge . It's because of your professional detailed knowledge you don't need to smash out sensational news like the TV channels. So, thank you very much for your comments! I'm German living in Spain.
I have been subscribed to your channel since the Orville dam. My brother lived outside of Oroville at the time. His house was burned down in 2018. In the Camp fire. I know the area, and I've been a fan of your channel since.
They finally got the ship out of our dock this morning. We had a draft of 42 feet and were waiting for the deeper channel to open. Glad I will be at work when they detonate the charges. We are roughly a half mile away
Thank you for daily information! I have enjoyed watching the serious work being done. Thank God all the men were found. Prayers for their family and friends. Prayers for worker safety 🙏
Why does god deserve praise for the recovery crew working hard to find the final bodies? Didn't god put that ship into the bridge? Isn't it all part of his plan? What exactly are you praying for?
The black strips are not the linear shaped charges, they are protective strips to catch the jet of molten metal after the charge detonates. The charges are the thin copper-coated strips which you see on the opposite side of the beams from the black strips. The charges run through the square holes cut in the web of the beams. If you want to see them in detail, there are documentaries out there showing CDI using linear shaped charges to demolish steel framed structures. The method CDI use is identical, with the pair of square holes for the charges joined by a thin chevron cut.
I've been on a boom lift inches from newly installed commercial windows at a car dealership near Toronto where every little movement had the basket bouncing around. Working at 3 stories up is scary with lots bouncing without wind.
Do you think that the Dalia will bounce up and down or list(?) with the removal of the truss weight? And what about the stability of the containers staying in place or toppling?
That black stuff isn't the actual charge, it's blast mat. It's supposed to stop or slow down debris coming off the blast itself, so it doesn't become deadly shrapnel. Watch some videos on controlled demolition, you'll often see it hung as curtains where the charges are placed. Other than that, a very very nice report. A big thank you to Captain Andy of the Minorcan Mullet to use some of his footage. He puts a lot of time and effort into capturing this story. So Saturday around 5 eh? Does anyone know what time low tide peaks? I hope there's a thousand cameras on this. Thanks Jeff!
2 mile radius is to keep ships and drunk boaters far away, the exclusion zone allows enough time for CG cutter to intercept before they are in the danger zone. Beam swinging was building up plastic deformation, and then as the steel cooled it finally fractured. The explosives are pretty inert until they put the detonators in, and likely here they are using coded detonators, which do not go off from stray currents, but which are addressed like stage lights, so they are all powered, and get sent a time delay command. Safer than a detcord as it can be tested for each charge right up to detonation, though a lot more expensive, and use once. But even with 5% failing that will still be successful in removing that beam structure, and then they can use larger charges to fracture the concrete after drilling into it to place them, or drill and use expanding mortar to fracture the concrete, so the claw and hammers can nibble it away.
linear shape charges are normal in demolition. they are chevron shaped copper clad explosives. the black things are likely conveyor belt or heavy mats to prevent projectiles from flying off the cut sections.
Jeff, I have spent a fair amount of time in shipyards in baskets hanging from cranes, riding sky climbers, and climbing on ladders and scaffolding on ships. I would not want to be doing any of this on barge cranes. Think about it your basket is hanging from a wire. You are standing in the basket. Your fall protection is hooked safely to the basket. Based on my experiences with repairs, if I was Dali's owner, I would be assessing the cost and time for repair versus calling the ship a total constructive loss. If they decide a repair is the right answer, I would expect them to have the shipyard build a completely new bow assembly. To me, it would be a complete waste of time and money to try to salvage anything. One of the questions that will need to be answered is how far aft would have to be replaced. The other day you were wondering why they were cutting steel and letting it drop into the water. You have to imagine the ship, the bridge remains, the salvors, and the cranes and rigging in 3D. The people with the torches were hanging in the basket above the steel that was going to drop. To secure the load to a second crane you would need to have clear access to rig the steel to the crane. You would need to be sure that when the mass was transferred the steel would move safely away from the men in the basket. A miscalculation could cost them their lives. I was in the shipyard during a ship construction project. The largest unit that could be handled was 150 LT. The units were erected so the majority of the welding was downland, so some units were built upside-down. To flip the units two cranes picked the unit up. One crane had a fabricated spreader roughly 30' × 6' fabricated of 3/4" plate. The other crane used 2 wire slings. The process involved lifting the unit, lowering the sling end until the spreader carried the full load. The slings were detached. The unit was rotated 180°, and the slings were reattached. The unit was now right-side-up. During the lift a wire sling failed and one crane lost its load. The crane with the spreader stayed attached, and the crane was able to hold the load. The unit was unharmed. The spreader was bent lengthwise into a perfect parabola. Luckily no one was hurt. Bob
I'd guess they would take a wrecking ball to the concrete pillars....generally that's how concrete structures are demolished. But I could be wrong in this case...
Earlier video shows where the main concrete pillar was was cut in two. Commenters under that video point out that a diamond studded belt saw (quarry style) was used, power plant mounted at the very front of the Dali itself, the chain a very long thin loop that cut concrete and steel cleanly.
Hey Jeff, longtime subscriber here. No such thing as "electrical tape." It's just vinyl tape preferred by electricians. Keep up the great work on your channel here. It's most fascinating my friend!
These workers are so amazing!!! It's so interesting to see what they are doing and how they have analyzed the work to be done and how they are executing their plan.
Jeff! Thanks for the great video compendium and explanations (and the pics from INSIDE the Dali's bow...!) I think I like your 'hair' on your professional page better than the 'UA-cam' semi-mullet style...A fan in Toronto!
Those black sheets are thick rubber mats, designed to slow down or stop the molten metal and shrapnel from the explosion of the shaped charges. The charges themselves are much smaller and fit in the small triangular slots that are being cut. Also, the charges are incredibly stable and won't even explode if engulfed in fire. The only thing that triggers the explosive to go off is a pressure wave from a detonator that is fired by an electrical charge.
I think the steel for the central truss is somewhere in the 2 to 4-inch thick range, possibly more, and about 4 to 6 feet wide by a couple of feet thick hollow beams. These are welded up from plate steel and bolted together with high-strength bolts to form the complete truss. There is very little chance that any of those charges will go off prematurely by accident because of the type of material used and how they are handled. These type of charges are frequently used to take down bridges and structures such as you showed yesterday. Even C4 can be dropped or hit with a hammer and not go off; it takes primers to set it off. What I know of this stuff is from videos and written info, but I would not want to just pick it up and mess with it without a lot of training.
Has nobody at Spacex noticed that just before Stage 1 touchdown, the camera view becomes blocked? Have seen this before. Seems like something easily corrected in order to follow all the way down with the great view that camera gives.
It's actually kind of amazing how well the ship withstood having a major bridge fall on it. I guess some of the containers above the deck absorbed a lot of the impact energy. I really want to know how the underwater hull held up.
The Dali is located on the Fort Armstead side of the channel it is about 3500 feet away from the observation area the exclusion zone and it only needs to be 2000-3000 feet away 1000-1500 ft on each side of the demolition. You are showing us demo on the east side and it is demo on the west side. 👍
Im not sure if I missed an explanation but was wondering why the controlled detonation instead of using the giant shear, torches and the claw? Are the Dali owners getting impatient in wanting their ship back to start repairs?
Because they can't safely predict how that structure will react if you start hacking at it one cut at a time. This takes it all apart at once so it can fall into the water where it is safe to work on. The Dali isn't going to be hauling cargo for a long time, if ever again. It isn't even a consideration. Getting the channel and thus the port of Baltimore fully open is the primary concern at this point.
It is incredible the amount of damage to the front of the ship. I can't see how the ship can be repaired. Thank you for the updates. Watching from Australia
They will dry-dock it, cut off the bow and fabricate a new one. Modern ships are built in segments and then joined together. The original engineering plans will show exactly how each part was made before they wee joined together. There are a lot of UA-cam videos on how these giant ships are built in the first place.
@@jeffostroff ohh i know it On this very night 10 years ago on this same stretch of road, in a dense fog, just like this. I saw the worst accident I've ever seen. It sounded like a garbage truck falling off the empire state building. And when they finally pulled the drivers body from the twisted burning wreck, it looked like this! Yes sir. that was the worst accident I've ever seen!
The black rectangles may be blast pads. You want as much energy as possible directed at the metal beams and you do not want shrapnel damaging the ship. After the Dali is refloated and the containers removed, the ship's owners will probably get the ship into a drydock. Replacing the bow may be cheaper than repairing the damage. Many of the structural members have been stressed beyond their elastic limit. Even if they have not, how would you test each joint and rivet and weld. Plus, refloating the Dali may cause additional damage. The Evergiven ran aground in the Suez Canal and even though she ran into soft sand, the bow was replaced rather than repaired. All of this is going to be very expensive and take months to accomplish.
@@brucenadams1 The 'what going on in shipping' guy said it's likely to be repaired. If the keel is highly damaged, scrapping may still be an option IMHO
I wonder if some charges will be set lower on the truss, nearer to the water. I'm not a demolition expert, but it seems to me that weakening the lower beams will help the weight fall away from the ship more easily.
I think the "blankets" not only reduce shrapnel, but concentrate (direct) the charge affect "into" the structure and n waste as little of the force as possible. The carges themselves are embedded into framework inside cut channels.
This will be a risky demo job. All it will take is for a cap to delay and things can go sideways. We had instanteanious caps and delay caps 50 years ago. Every once in a while an instanteanious cap would be defective and wouldn't fire or would delay. For that reason we double primed. I don't know if they double prime charges now. It should be very interesting to watch. Good Luck, Rick
I keep wondering about the crew person or persons who presumably had been on the bow of the Dali to operate the anchor winch when the pilot desperately called for the port-side anchor to be dropped just before collision with the bridge pier. They must have survived the crash of course, but did they see the bridge coming up quickly and decide to get the heck out of there?
These are plasma-jet charges of the same type used to seperate the space shuttle from that big orange fuel tank that lifted off from the Cape with it, older reliable technology. A detonator to initiate primacord, variable delay non-els to initiate cutter charges to get it moving away from the ship before it is completely cut. Modern explosives are extremely safe, they don't go off on their own they must be forced to go off.
You don't use plasma jet charges anywhere near 16 inch pipes carrying liquid hydrogen and liquid oxygen. They use enclosed dual detonator frangible nut/bolt assemblies to secure the fore and aft struts and the ET umbilical plates to the bellly of the orbiter. They use the RCS thrusters to move the shuttle away from the tank. I really wonder where people come up with this stuff.
@@stargazer7644 A local guy copied and modified the NASA ones (with their approval) for use as collar cutters in the oil patch, they were the best at the time. For what its worth...
@@bruceday6799 You do realize the documentation and drawings for how the system worked is all publically available? NASA doesn't need to give their approval. Anything NASA creates is public domain. That's why all the drawings are out there.
The charges are completely safe to handle. They will only explode when detonators are put into them and an they are wired to explode. The black things are mats that contain the explosion and send the pressure wave through the steel and not into the air.
They are shaped charges encased in copper. When the charge goes off it turns the copper into a knife blade. In less than 100th of a second the steel is cut. Then gravity takes over and pulls things apart. The fun part is those charges are held in place with ordinary rubber bands.
Thank you this is so interesting even for people who don't live in USA. I have wondered about this. By the way these people are TRAINED in Explosions very well)
The 2000 yard zone they announced before wasn’t the blast safety area, it was just the hearing protection area. So if you were within that circle you should wear earplugs or other hearing protection. It wasn’t designed to be overkill, and people will absolutely be within that area during the detonation. (The Dali crew for sure, and I’m betting the news media are just meeting at the staging area to get on a boat that will take them even closer).
That damage to the Dali is incredible. With that weight and impact, their surely would be further damage, maybe even to the keel. Would love to be there, but im in the UK.
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Jeff, If you have to ask what that metal shear costs, you cannot afford it!
😊😊
Jeff , I am sitting in my lounge half a world away from Baltimore, we don't see any of the work being done , so It is so good to watch your, and Capt Andy's video feeds and commentary . The work that is being done to release the ship and clear the site is phenomenal, and I appreciate being able to watch .
the shaped charges are quite small, basically like det-cord with a lens, what we're seeing are the "blankets" to cut down on flying debris.
Yes, they quite often use Conveyor belt for the Blankets, It is very tough, but still flexible enough to give where needed.
Came here to say that
The shaped charges are shaped like a piece of angle iron. I've watched several of the videos that PBS had of CDI preparing structures for demolition that showed the shaped charges.
@Jeffostroff The blankets also act as 'tamping' that helps focus the explosion towards the target as well as reducing debris flying from the site. Often they use heavy things like sandbags or even bottles or containers of water to tamp an explosive charge so that it is pointed in a specific direction. I think that, in this case, they are just using the blankets and what looks like commercially made linear shaped charges. In the demo video segment about the controlled detonation, the charges depicted were the type that are basically a piece of angle-iron with plastic explosive packed into the inner corner in a fillet shape. The angle-iron is the main tamping element. That and the fillet shaped cross section of the explosive is the 'lense' that directs the explosion forward in a jet to cut the target. Its like they stretched the charge from an anti-tank rocket out in a line. There is no copper in front to make a projectile though. They don't need it because the charge is pressed right against the target. I am wondering how close their demo is to how the actual detonation goes. In the demo, all the pieces fall conveniently off the ship...
Who cares
Like others have said, the black rectangles appear to be blast mats to mitigate the fragmentation from the explosive charge. If you look closely at time 3:27, you can just make out the copper looking rod that is the linear shaped charge they are using to cut the bridge trusses.
All of the years driving over the FSK bridge I never realized how big the steel above the roadway was! Wow!
Agreed. Structures like this often look like a delicate latticework from a distance. Plus, as the bridge had no pedestrian access there were no people around give a better sense of scale.
Amazing how we ALL take thingscfor granted, isn't it?
Nobody ever LOOKS at the things around us and appreciate the ammount of effort it takes to put them there, and to keep them there.
Big
Jeff - - - You have the PERFECT voce for narrating UA-cam videos! Thanks.
Wow, thanks!
Thank you for explaining all this so we can understand what's going on as we watch it. I'm saddened by the deaths of the construction workers and I'm glad they have been found.
Condolences to all the survivors. Victims RIP.
Controlled Demolition Inc out of Phoenix, MD is one of the best demo companies in the nation.
Baltimore people should be very familiar with controlled demo. They turned high rises projects to dust before CDI went to NY for assist with the clean up of the world trade center.
This has been an amazing journey with you. Thank you for sharing this time in human history with me - it is another chapter in my life in Baltimore book.
I wondered if CDI was doing the work. They definitely are a top notch company with lots of expertise.
Congratulations to the explosive business.
Jeff, I really enjoy your video's on the Francis Scott Key Bridge updates. They are very informative and helpful to explain how they going about removing the structure.
Thank you, Jeff, for all of your work.
I remember you about the condo bldg collapse in FL.
Jeff, thank you for your daily news!
Thanks, I'm glad you liked it!
Jeff there's not enough to report on daily. Leave it to Captain Sal. You are only here at this point to keep getting clicks.
@@timsmothers8740for me as a foreigner with not so good English skills, JEFF is the best journalist and he has a well understanding voice!
I think it's amazing how many good professionals they have brought in with almost no notice. It takes me longer than that to find a guy to fix my roof!
FIY.
@@AshoreToo/ It just takes a large amount of money to get this kind of response......these contractors are like buzzards sitting around ready to pounce.
Thank you Jeff. I can’t wait to watch this on Saturday
Hey, it's Sunday Night, 20:10. Nothing on computer showing the Blast (s) ?
Always enjoy watching your analytical videos, you take an enormous amount of time and energy to assess these incidents. Just wanted to say, hello to you from the Isle of Axholme in North Lincolnshire, England
At all video I admire how clean, aka well-painted the bridge trusses are. If one looks at other bridges the dominant impression is rust. But here, I have still to detect any rusty spot. SO either they did the painting just the other day and/or are doing a fantastic job of keeping the bridge in good order.
Well spotted detail! It wasn't until I read your comment that I realised just how clean the bridge steel work looked.
The trouble with a bridge like this one is that if you allow your maintenance program to get away from you, it then takes extra time and money to try and recapture it!
Mark fromMelbourne Australia 🇦🇺
I don't know about this bridge, but I've heard that the Sydney Harbour Bridge in Sydney, Australia is being continually repainted - when they finish one repaint, they start again from the other end. It's over 90 years old now....
Suspect most large steel bridges are similarly under continual maintenance. (Greetings from Sydney, Australia).
Today was a great collection of footage and pictures!
Glad you enjoyed it
Great job Jeff as always.
Can't wait! Native Las Vegan here! Have seen Soo many of our old Hotels Brought down, that it would be Refreshing to see how they do a Bridge!
This isn’t comparable to a standing building or bridge for that matter. This is twisted metal. A whole different ballgame. Incredibly unpredictable.
@@makattak88 more bridges have been blown up, but never with a ship underneath. you can hope the ship doesn't sink.
@@Jodocus1000 You don’t understand. Those bridges were standing. It’s way different.
2:50, those black detonation Bars are the backing, the charges are underneath those are to focus the power of the explosion toward the Bridge girders
Hi Jeff,
I like your comments about the Baltimore bridge .
It's because of your professional detailed knowledge you don't need to smash out sensational news like the TV channels.
So, thank you very much for your comments!
I'm German living in Spain.
Thanks for this video, so explanatory! I also watched your kitchen remodel, so detailed too. Appreciate your coverage.🇨🇦👍
Thanks so much! 😊
Ready for Saturday. Thanks for video.
You have a playful sense of humor. Thanks for keeping us entertained in many ways.
Thanks for watching!
I have been subscribed to your channel since the Orville dam. My brother lived outside of Oroville at the time. His house was burned down in 2018. In the Camp fire. I know the area, and I've been a fan of your channel since.
You are very good at doing this, factual and a soothing voice, no drama!!!😊😊😊😊😊😊😊
thank you for highlighting the cursor! it is very difficult to see otherwise.
It's 12:21am & here I am...🤔 hearing a melodious voice as I gently drift into slumber. (Pun int.) Thank you, Jeff 🙏
Love the updates. Thank you
They finally got the ship out of our dock this morning. We had a draft of 42 feet and were waiting for the deeper channel to open.
Glad I will be at work when they detonate the charges. We are roughly a half mile away
Thank you for daily information! I have enjoyed watching the serious work being done. Thank God all the men were found. Prayers for their family and friends. Prayers for worker safety 🙏
Why does god deserve praise for the recovery crew working hard to find the final bodies? Didn't god put that ship into the bridge? Isn't it all part of his plan? What exactly are you praying for?
The black strips are not the linear shaped charges, they are protective strips to catch the jet of molten metal after the charge detonates. The charges are the thin copper-coated strips which you see on the opposite side of the beams from the black strips. The charges run through the square holes cut in the web of the beams.
If you want to see them in detail, there are documentaries out there showing CDI using linear shaped charges to demolish steel framed structures. The method CDI use is identical, with the pair of square holes for the charges joined by a thin chevron cut.
Yeah, thanks but he explained this. 3:29
I snorted my coffee when @jeffostroff asked how much it would cost to have one of the giant cranes shipped to him 🤣🤣🤣
Great Progress , it will cleared away before you can blink 😮
Awesome
I've been on a boom lift inches from newly installed commercial windows at a car dealership near Toronto where every little movement had the basket bouncing around. Working at 3 stories up is scary with lots bouncing without wind.
Do you think that the Dalia will bounce up and down or list(?) with the removal of the truss weight? And what about the stability of the containers staying in place or toppling?
If its stuck in the mud, it will take some force to remove it, so I doubt it will bounce until the suction is released...
Great info Jeff, Amazing how fast they are moving along, Especially through some rough weather they are getting.
Glad they found the last? worker.
Stunning footage - thanks.
That black stuff isn't the actual charge, it's blast mat. It's supposed to stop or slow down debris coming off the blast itself, so it doesn't become deadly shrapnel. Watch some videos on controlled demolition, you'll often see it hung as curtains where the charges are placed. Other than that, a very very nice report. A big thank you to Captain Andy of the Minorcan Mullet to use some of his footage. He puts a lot of time and effort into capturing this story.
So Saturday around 5 eh? Does anyone know what time low tide peaks? I hope there's a thousand cameras on this. Thanks Jeff!
2 mile radius is to keep ships and drunk boaters far away, the exclusion zone allows enough time for CG cutter to intercept before they are in the danger zone.
Beam swinging was building up plastic deformation, and then as the steel cooled it finally fractured. The explosives are pretty inert until they put the detonators in, and likely here they are using coded detonators, which do not go off from stray currents, but which are addressed like stage lights, so they are all powered, and get sent a time delay command. Safer than a detcord as it can be tested for each charge right up to detonation, though a lot more expensive, and use once. But even with 5% failing that will still be successful in removing that beam structure, and then they can use larger charges to fracture the concrete after drilling into it to place them, or drill and use expanding mortar to fracture the concrete, so the claw and hammers can nibble it away.
linear shape charges are normal in demolition. they are chevron shaped copper clad explosives. the black things are likely conveyor belt or heavy mats to prevent projectiles from flying off the cut sections.
You never worry about accidently blowing yourself up.
One second your whistling in the breeze, a few milliseconds later your a pink mist, painless.
Jeff,
I have spent a fair amount of time in shipyards in baskets hanging from cranes, riding sky climbers, and climbing on ladders and scaffolding on ships. I would not want to be doing any of this on barge cranes. Think about it your basket is hanging from a wire. You are standing in the basket. Your fall protection is hooked safely to the basket.
Based on my experiences with repairs, if I was Dali's owner, I would be assessing the cost and time for repair versus calling the ship a total constructive loss. If they decide a repair is the right answer, I would expect them to have the shipyard build a completely new bow assembly. To me, it would be a complete waste of time and money to try to salvage anything. One of the questions that will need to be answered is how far aft would have to be replaced.
The other day you were wondering why they were cutting steel and letting it drop into the water. You have to imagine the ship, the bridge remains, the salvors, and the cranes and rigging in 3D. The people with the torches were hanging in the basket above the steel that was going to drop. To secure the load to a second crane you would need to have clear access to rig the steel to the crane. You would need to be sure that when the mass was transferred the steel would move safely away from the men in the basket. A miscalculation could cost them their lives.
I was in the shipyard during a ship construction project. The largest unit that could be handled was 150 LT. The units were erected so the majority of the welding was downland, so some units were built upside-down. To flip the units two cranes picked the unit up. One crane had a fabricated spreader roughly 30' × 6' fabricated of 3/4" plate. The other crane used 2 wire slings. The process involved lifting the unit, lowering the sling end until the spreader carried the full load. The slings were detached. The unit was rotated 180°, and the slings were reattached. The unit was now right-side-up.
During the lift a wire sling failed and one crane lost its load. The crane with the spreader stayed attached, and the crane was able to hold the load. The unit was unharmed. The spreader was bent lengthwise into a perfect parabola. Luckily no one was hurt.
Bob
How interesting, thank you for the detailed info from an old lady from upper Michigan who's interested in everything!!!
@dianebeier8379 I am an old man who grew up in the Lower Peninsula and received his training at the University of Michigan. Go Blue!
I do appreciate these videos on whats happening in the Baltimore harbor.
Boy,,,, This Man "Jeff'' Does a Great Job,,, Great Voice, Great Timing, Great Knowledge
How are they going to cut up and clear the concrete parts of the bridge?
I'd guess they would take a wrecking ball to the concrete pillars....generally that's how concrete structures are demolished. But I could be wrong in this case...
Earlier video shows where the main concrete pillar was was cut in two. Commenters under that video point out that a diamond studded belt saw (quarry style) was used, power plant mounted at the very front of the Dali itself, the chain a very long thin loop that cut concrete and steel cleanly.
Thanks for your very informative videos.
Hey Jeff, longtime subscriber here. No such thing as "electrical tape." It's just vinyl tape preferred by electricians. Keep up the great work on your channel here. It's most fascinating my friend!
Minorcan Mullet gave you a nice live shout out after seeing my comment, in his live stream, that you sent me to his channel.
Thanks for the video.
Wow Incredible Video Thank You
How will they remove the concrete bridge support pylons? Will they also implode those supports?
As far as stuff "going into the drink" and settling on the bottom, like those smaller pieces, do they recover that stuff straight away?
These workers are so amazing!!! It's so interesting to see what they are doing and how they have analyzed the work to be done and how they are executing their plan.
Question. Would someone have created some sort of mathematical model for all the forces and where to put the charges?
So who was the videos 1:25 of was that silverter Stallone?
These damn machines they are using for demo are incredible.
Excellent commentary!
Jeff! Thanks for the great video compendium and explanations (and the pics from INSIDE the Dali's bow...!) I think I like your 'hair' on your professional page better than the 'UA-cam' semi-mullet style...A fan in Toronto!
Those black sheets are thick rubber mats, designed to slow down or stop the molten metal and shrapnel from the explosion of the shaped charges. The charges themselves are much smaller and fit in the small triangular slots that are being cut.
Also, the charges are incredibly stable and won't even explode if engulfed in fire. The only thing that triggers the explosive to go off is a pressure wave from a detonator that is fired by an electrical charge.
Do you think that they’ll fish out all the steel out or just leave it if it’s laying flat on the riverbed?
I think the steel for the central truss is somewhere in the 2 to 4-inch thick range, possibly more, and about 4 to 6 feet wide by a couple of feet thick hollow beams. These are welded up from plate steel and bolted together with high-strength bolts to form the complete truss.
There is very little chance that any of those charges will go off prematurely by accident because of the type of material used and how they are handled. These type of charges are frequently used to take down bridges and structures such as you showed yesterday. Even C4 can be dropped or hit with a hammer and not go off; it takes primers to set it off. What I know of this stuff is from videos and written info, but I would not want to just pick it up and mess with it without a lot of training.
Has nobody at Spacex noticed that just before Stage 1 touchdown, the camera view becomes blocked? Have seen this before. Seems like something easily corrected in order to follow all the way down with the great view that camera gives.
That smoke stack in fast forward lol
Yes, the passing boats look cool in FF also
Thats stream not smoke
It's actually kind of amazing how well the ship withstood having a major bridge fall on it. I guess some of the containers above the deck absorbed a lot of the impact energy. I really want to know how the underwater hull held up.
Smushed into the mud, so probably perfectly intact. They may need to hose out the mud to release the ship, if it doesn't pop up of its own accord.
It didn't. The forward compartments are flooded.
@@stargazer7644 [citation needed]
This will be a great show Saturday 👏 Is that smoke stack a power station?
Yes that is steam coming from the power station
The Dali is located on the Fort Armstead side of the channel it is about 3500 feet away from the observation area the exclusion zone and it only needs to be 2000-3000 feet away 1000-1500 ft on each side of the demolition. You are showing us demo on the east side and it is demo on the west side. 👍
Im not sure if I missed an explanation but was wondering why the controlled detonation instead of using the giant shear, torches and the claw? Are the Dali owners getting impatient in wanting their ship back to start repairs?
Because they can't safely predict how that structure will react if you start hacking at it one cut at a time. This takes it all apart at once so it can fall into the water where it is safe to work on. The Dali isn't going to be hauling cargo for a long time, if ever again. It isn't even a consideration. Getting the channel and thus the port of Baltimore fully open is the primary concern at this point.
When the cleanup stage is over you’ll be able to make a great review film!
Excellent narrative sir, as always. tku.
Many thanks!
wow... that is going to be sooo cool. Late Saturday... i would like to watch that.
It is incredible the amount of damage to the front of the ship. I can't see how the ship can be repaired. Thank you for the updates. Watching from Australia
They will dry-dock it, cut off the bow and fabricate a new one. Modern ships are built in segments and then joined together. The original engineering plans will show exactly how each part was made before they wee joined together. There are a lot of UA-cam videos on how these giant ships are built in the first place.
Jeff, i got only 2 friends that know of large marge. You just made my day when you said that, boy aren't we old lol?
From like 1984 when Pee Wee came out
@@jeffostroff ohh i know it
On this very night 10 years ago on this same stretch of road, in a dense fog, just like this. I saw the worst accident I've ever seen. It sounded like a garbage truck falling off the empire state building. And when they finally pulled the drivers body from the twisted burning wreck, it looked like this! Yes sir. that was the worst accident I've ever seen!
By the way does USA have the largest crane or does it come from somewhere else??????
Love your content! If they broadcast the demo live you should consider going live and giving us live feedback.
Thanks Jenn!
That big beam that was cut, probably 5000+ lbs and they definitely had to cut the last little bit. Iron workers are badass!
Like that one about Amazon, Jeff. I wonder if there's a TEMU version!!!!!!!
They found some stolen cars in the box cars. Any more info on that?
They found some cars in containers. That's how they're shipped on container ships. There's no evidence they're stolen. It's clickbait.
The black rectangles may be blast pads. You want as much energy as possible directed at the metal beams and you do not want shrapnel damaging the ship. After the Dali is refloated and the containers removed, the ship's owners will probably get the ship into a drydock. Replacing the bow may be cheaper than repairing the damage. Many of the structural members have been stressed beyond their elastic limit. Even if they have not, how would you test each joint and rivet and weld. Plus, refloating the Dali may cause additional damage. The Evergiven ran aground in the Suez Canal and even though she ran into soft sand, the bow was replaced rather than repaired. All of this is going to be very expensive and take months to accomplish.
The Dali will not be fixed and seaworthy until well over a year from now
@@MikeBarbarossa I agree. Do you think the owners will scrap the ship rather than repair it?
@@brucenadams1 The 'what going on in shipping' guy said it's likely to be repaired. If the keel is highly damaged, scrapping may still be an option IMHO
Did they remove the 21 crew members off ship?
No the crew will shelter in place
Who is doing the implosion there is a Pennsylvania company that specializes in it. I was just wondering if that is some company
What time today is the explosion?
5 pm
5 pm
@@jeffostroff Thanks so much! I am watching patiently!!!!!
@@jeffostroff Now I am hearing tomorrow at 7pm??
I wonder if some charges will be set lower on the truss, nearer to the water. I'm not a demolition expert, but it seems to me that weakening the lower beams will help the weight fall away from the ship more easily.
Galion, 15 ton mobile crane is a good example of a Cherry Picker.Pipe fitters use them a lot to put pipe in the pipe racks.
به نظر شما هزینه کامل بازسازی واواربرداری چقدر میشه
Let's hear it for these guys! Long live SCIENCE AND ENGINEERING ❤
Your videos are very interesting
I think the "blankets" not only reduce shrapnel, but concentrate (direct) the charge affect "into" the structure and n
waste as little of the force as possible. The carges themselves are embedded into framework inside cut channels.
This will be a risky demo job. All it will take is for a cap to delay and things can go sideways. We had instanteanious caps and delay caps 50 years ago. Every once in a while an instanteanious cap would be defective and wouldn't fire or would delay. For that reason we double primed. I don't know if they double prime charges now. It should be very interesting to watch. Good Luck, Rick
I keep wondering about the crew person or persons who presumably had been on the bow of the Dali to operate the anchor winch when the pilot desperately called for the port-side anchor to be dropped just before collision with the bridge pier. They must have survived the crash of course, but did they see the bridge coming up quickly and decide to get the heck out of there?
These are plasma-jet charges of the same type used to seperate the space shuttle from that big orange fuel tank that lifted off from the Cape with it, older reliable technology. A detonator to initiate primacord, variable delay non-els to initiate cutter charges to get it moving away from the ship before it is completely cut. Modern explosives are extremely safe, they don't go off on their own they must be forced to go off.
You don't use plasma jet charges anywhere near 16 inch pipes carrying liquid hydrogen and liquid oxygen. They use enclosed dual detonator frangible nut/bolt assemblies to secure the fore and aft struts and the ET umbilical plates to the bellly of the orbiter. They use the RCS thrusters to move the shuttle away from the tank. I really wonder where people come up with this stuff.
@@stargazer7644 A local guy copied and modified the NASA ones (with their approval) for use as collar cutters in the oil patch, they were the best at the time. For what its worth...
@@bruceday6799 You do realize the documentation and drawings for how the system worked is all publically available?
NASA doesn't need to give their approval. Anything NASA creates is public domain. That's why all the drawings are out there.
The charges are completely safe to handle. They will only explode when detonators are put into them and an they are wired to explode. The black things are mats that contain the explosion and send the pressure wave through the steel and not into the air.
w minucie 4:29 filmu widać jak jedna noga betonowa fundamentowa jest pusta w środku jak cienka rura kwadratowa
They are shaped charges encased in copper. When the charge goes off it turns the copper into a knife blade. In less than 100th of a second the steel is cut. Then gravity takes over and pulls things apart. The fun part is those charges are held in place with ordinary rubber bands.
Rubber bands>> I don't think so, more black steel and threaded rods abd nuts - then again I could be wrong
I like your stuff. Quick question do they call the floors on ships floors or decks ?
Sailors even call the floors on buildings "decks".
Thank you this is so interesting even for people who don't live in USA. I have wondered about this. By the way these people are TRAINED in Explosions very well)
Definitely interested don't really think this will work still need to recover the parts
Was wondering when we going to get this view
The 2000 yard zone they announced before wasn’t the blast safety area, it was just the hearing protection area. So if you were within that circle you should wear earplugs or other hearing protection. It wasn’t designed to be overkill, and people will absolutely be within that area during the detonation. (The Dali crew for sure, and I’m betting the news media are just meeting at the staging area to get on a boat that will take them even closer).
That damage to the Dali is incredible. With that weight and impact, their surely would be further damage, maybe even to the keel. Would love to be there, but im in the UK.