Ready To Blow Key Bridge Off MV Dali Baltimore
ฝัง
- เผยแพร่เมื่อ 8 พ.ค. 2024
- Jeff Ostoff shows you the latest US Coast Guard attempts to remove the Francis Scott Key Bridge truss off the bow of the MV Dali ship. There are also more updates on the engineering disaster aftermath of the MV Dali ship striking the Francis Scott Key Bridge causing the bridge collapse in Baltimore, Md. on the Patapsco River. The video also shows how they are installing the detonators for using precision-cut demolition explosives to break apart the bridge truss and force it to slide off the MV Dali. You'll also see the incredible cranes cutting off and removing large sections of existing bridge truss metal from the now re-closed channel. They closed this limited access channel on April 29, 2024, after the first ships to pass through the new limited access channel, a deepwater 300 ft wide, and a 35-foot deep access channel for larger ships, the first time since the MV Dali collided with the Francis Scott Key Bridge in Baltimore, MD on March 26, 2024. You'll see progress so far in this Baltimore bridge collapse.
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Jeff, If you have to ask what that metal shear costs, you cannot afford it!
😊😊
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
Jeff - - - You have the PERFECT voce for narrating TH-cam videos! Thanks.
Wow, thanks!
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.
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.
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.
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.
I snorted my coffee when @jeffostroff asked how much it would cost to have one of the giant cranes shipped to him 🤣🤣🤣
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, 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!
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 🙏
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 .
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.
Today was a great collection of footage and pictures!
Glad you enjoyed it
Thank you Jeff. I can’t wait to watch this on Saturday
Thank you, Jeff, for all of your work.
I remember you about the condo bldg collapse in FL.
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).
Great job Jeff as always.
You are very good at doing this, factual and a soothing voice, no drama!!!😊😊😊😊😊😊😊
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.
It's 12:21am & here I am...🤔 hearing a melodious voice as I gently drift into slumber. (Pun int.) Thank you, Jeff 🙏
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.
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
Ready for Saturday. Thanks for video.
Thanks for this video, so explanatory! I also watched your kitchen remodel, so detailed too. Appreciate your coverage.🇨🇦👍
Thanks so much! 😊
Great Progress , it will cleared away before you can blink 😮
Awesome
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!
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.
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
You have a playful sense of humor. Thanks for keeping us entertained in many ways.
Thanks for watching!
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
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
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!
thank you for highlighting the cursor! it is very difficult to see otherwise.
Love the updates. Thank you
You never worry about accidently blowing yourself up.
One second your whistling in the breeze, a few milliseconds later your a pink mist, painless.
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.
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.
Stunning footage - thanks.
Minorcan Mullet gave you a nice live shout out after seeing my comment, in his live stream, that you sent me to his channel.
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!
Thanks for the video.
That smoke stack in fast forward lol
Yes, the passing boats look cool in FF also
Thats stream not smoke
Wow Incredible Video Thank You
Great info Jeff, Amazing how fast they are moving along, Especially through some rough weather they are getting.
Glad they found the last? worker.
Thanks for your very informative videos.
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 'TH-cam' semi-mullet style...A fan in Toronto!
Boy,,,, This Man "Jeff'' Does a Great Job,,, Great Voice, Great Timing, Great Knowledge
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.
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.
Excellent commentary!
I do appreciate these videos on whats happening in the Baltimore harbor.
Excellent narrative sir, as always. tku.
Many thanks!
When the cleanup stage is over you’ll be able to make a great review film!
Amazing.
Hey, it's Sunday Night, 20:10. Nothing on computer showing the Blast (s) ?
At 5:45pm on Saturday: "Nothing to see here! Please disperse!"
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!
Your videos are very interesting
Nice!!!
wow... that is going to be sooo cool. Late Saturday... i would like to watch that.
Those are not Cherry Pickers! They are Boom Lifts!
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.
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. 👍
These damn machines they are using for demo are incredible.
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)
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 TH-cam videos on how these giant ships are built in the first place.
Let's hear it for these guys! Long live SCIENCE AND ENGINEERING ❤
Just missed this...have to catch the next one! Yep, blow it at night, but combining a serious job with a 'show' can go wrong. So night-time please, just don't screw it up. Thanks from Australia. ⚓
Watching this at 0:5 speed makes for better viewing of damage and is even quite funny because Jeff sounds like he's drunk. 😂
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.
Like that one about Amazon, Jeff. I wonder if there's a TEMU version!!!!!!!
Love your content! If they broadcast the demo live you should consider going live and giving us live feedback.
Thanks Jenn!
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...
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.
That big beam that was cut, probably 5000+ lbs and they definitely had to cut the last little bit. Iron workers are badass!
Those big black squares are NOT the demo charges; those are blast blankets covering the LINEAR Shaped Charges to keep flying debris down.
Baltimore pre Fourth of July fireworks.
As far as stuff "going into the drink" and settling on the bottom, like those smaller pieces, do they recover that stuff straight away?
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 guess at 8:00 they saw the blue lights that popped up in the mirror and thought “Oh no, now we are doomed. We're all going to jail. Stop what we're doing and call our families to say goodbye.”
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
Was wondering when we going to get this view
They are moving at lightning speed.
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]
In a silly moment, I figured they should cover all the pieces with car air bags and when the linear shaped charges do the cutting of the parts, each section would then trigger the airbags and rather than sinking to the bottom of the Federal Channel, all the sections would just sit on the surface floating ... and a tug boat with a big magnet could go past and tow all the bits over to Tradepoint Atlantic. :)
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.
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.
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.
Ready
I want to push the button that detonates it
OH look, The Italian Stallion !
Go down to the FL Keys and watch the line men work the electrical transmission lines from a bucket truck sometimes on a barge.
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.
If I recall the black Paches are probably plywood sheets wrapped with Geotech blast wrap.
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).
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.
I think that they wanted anybody who was close to where these "charges" will be detonated, far enough away to make sure they wouldn't get hit with debris. I've seen videos of these charges being used by demolition companies to take down buildings, but not the size they are using for this job. The charges for this bridge removal are massive. If any piece were not covered properly, they could travel in any direction very quickly.
The proper terminology is a “kinetic disassembly” of the truss remains. Military engineers have their own vocabulary.
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?
Question. Would someone have created some sort of mathematical model for all the forces and where to put the charges?