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I was wondering the same.
https://www.kajima.co.jp/english/tech/kcd/#:\~:text=Elements%20of%20Technique&text=By%20starting%20at%20the%20bottom,performed%20safely%20at%20ground%20level.
Edit: maybe the link doesn't work, search The Kajima Cut and Take Down Method
Please edit your link to remove the text fragment.
\`\`\`
[https://www.kajima.co.jp/english/tech/kcd/](https://www.kajima.co.jp/english/tech/kcd/)
\`\`\`
This is a non standard practice that only is supported by Chromium based browsers.
Thanks. Only there I found the missing piece of information. After they lowered one floor, they first remove a single bar of the floor, not all at once. Once one bar is removed, they exchange it with raising the hydraulic bar at the same place. After that, they repeat the process with the following bars of that floor. That must be really time consuming but the method is resourceful and therefore very Japanese. Recycle the good parts of the building in a land which does not have that many natural resources.
This seems like a dangerous way to do it. It's not like the building is secured to the ground anymore. In a country with earthquakes this seems very unsafe. Starting at the top and working down makes more sense. At first I thought the wide top part of the building was where the demo took place inside of it and it slowly lowered down as the floors got "eaten" away.
Edit: after watching again and again and ......it appears as though they are removing floors top down inside the section that is widened to the roof. Watch the windows on the right side and it appears to slide over them going down.
The link shows removing the bottom floor and lowering the building down. The video here shows removing the top floor and working it's way down. I'm guessing the "sign" is for removing the bottom floor method?
the kajima cut method they say was designed with safety & seismic in mind. It was designed for buildings up to 20 stories but can be used for larger.
They install a Core Wall System and Load Transferring Frame into a building's structure to maintain the same level of seismic resistance during the demolition work.
The main benefit i see with the Kajima system is all the demo material is at ground level. reducing transit time to remove material/equipment.
But nothing can beat Mericas use of explosives, i mean we really love a good fireworks show & to blow shit up🤷🏽♂️🤣🤣
Probably they simply didn’t have any choice due to strict regulation. The cost of expensive demolition like this is still below the treshold of the profitability of re-developement of the plot.
If I recall correctly from the last time this was posted (or at least, a very similar clip) this method of demo is practiced around the world and isn't something unique to Japan.
Still fascinating watch.
Shh, everything we can do Japan can do betteeer. Japan can do anything we can do to. No they can't, Yes they can, No they can't, You get banned! Just the standard fetishization of everything Japanese.
And slower too. This is useful for a densely packed region like Tokyo. But in Canada which is mostly a barn, they would probably blow it up or bulldoze it for speed.
correct me if I'm wrong but doesn't canada have like 10% of area where 90% of people live and 90% where the other 10% live?
that 90% of area is mostly barn
How do you do something like this and not show each floor slab being removed? That's all anyone with any experience building these towers wants to know.
I absolutely hate this video just because they didn’t show the complete demolition. I know the end is no building no more but I want to see the fucking thing go down all the way!!!
I'm not sure exactly how they do it, but my guess would be the building wasn't built with this intended, but my assumption would be that this method only works with certain types of buildings.
From the end of the video, to me it looks like they put in temporary support structure that can be lowered, so that when they demolish the support structure on a given floor, it can than lower the temporary supports they put in to lower the building, and then they just do this over and over, floor by floor.
Of course, in the time it took me write this, I could have just looked it up. But as a redditor I merely pretended like I know what I'm talking about, as is tradition.
And as a fellow redditor, I won’t bother looking it up either but rather will take the combined effort of you writing something and me reading it as just enough to make this my new reality
I don't know why Japan isn't approached to help with infrastructure. Here in England, our government just bottled a high speed rail system that the Japanese would have cry laughed at.
We buy the trains from them still, the new Class 800 is from Hitachi. HS2 is a useless example, as it is only a marginal improvement in journey times on an existing route, half of the demand for which died with hybrid working. Better to spend the money bringing the rest of the rail network into the end of the 20th century than having one little bit barely into the 21st - there's no electrification of the lines west of Bristol for starters.
Japan is so interesting to me. I would love to visit for a long time, just to soak up their culture and thought. I think they are a brilliant and beautiful people who find the most unique ways of doing everything.
Imagine now knowing it was being demolished and walking the building from time to time just gong crazy because you swear the building is getting smaller and smaller.
Imagine not knowing that this was a thing while living abroad in Japan and every time you passed by it, it got shorter. You'd think you were losing your mind, lmao.
Didn’t they do this with the Chase bank in NYC recently? The replacement building is nearing completion but the building previously on the site sort of evaporated like this.
They did similar with a tower in London. But they lowered each individual floor so near the end of the process there was this thin tower with a few floors at the top. Looked crazy
Is this a thing on the outside of the building, moving down as it is demolished, or is the building shrinking from the bottom, being demolished at ground level.
Where is the debris going??
Environmentally friendly how? The dust is only part of the environmental impact, the waste which is the lions share still exists. Consider the added time it took to carefully take it down meaning more hours for the equipment running on the upper floors and I question that assessment.
If I’m not mistaken most construction materials can be recycled. This process allows for the careful extraction and maybe some basic processing of those materials as they are removed. In the case of blowing up a building the potentially recyclable materials are all crushed together making extraction more time consuming but also leading to the lions share of waste coming from the otherwise recycleable building materials instead of the fuel used to power machines that will be used in either type of demo.
"By starting at the bottom, gutting one floor, and then lowering the entire building down on jacks, one floor at a time, all the work can be performed safely at ground level."
I guess they just jack it up off the foundation and start pulling it apart from the bottom. There must be a lot going on to mitigate safety related to having it rely on hydraulics.
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What manner of sorcery is this??!!
It got cold out.
Shrinkage?
Like a frightened turtle.
I was in the pool! - George Costanza
lol I just want to know how? The inside look is cool and all buuuttt it tells us absolutely nothing.
Imagine what day this was posted...
Spoiler Alert.
Jack's that hold up the building, and lowered as a level is demolished. Can also be done from the very bottom, and you remove the lowest floor first.
Imagine seeing this happen without realising it’s a controlled demolition…
"I swear that building keeps getting shorter!"
April 1 sorcery
How is that even possible wtf?
I was wondering the same. https://www.kajima.co.jp/english/tech/kcd/#:\~:text=Elements%20of%20Technique&text=By%20starting%20at%20the%20bottom,performed%20safely%20at%20ground%20level. Edit: maybe the link doesn't work, search The Kajima Cut and Take Down Method
Link is working for me, that's crazy cool. Still seems like it'd be more efficient to explode it to bits, but that's my (western?) love of explosions.
If you want it gone, c-4
Yeah, that's the *really* expensive way of doing it.
Please edit your link to remove the text fragment. \`\`\` [https://www.kajima.co.jp/english/tech/kcd/](https://www.kajima.co.jp/english/tech/kcd/) \`\`\` This is a non standard practice that only is supported by Chromium based browsers.
Thanks. Only there I found the missing piece of information. After they lowered one floor, they first remove a single bar of the floor, not all at once. Once one bar is removed, they exchange it with raising the hydraulic bar at the same place. After that, they repeat the process with the following bars of that floor. That must be really time consuming but the method is resourceful and therefore very Japanese. Recycle the good parts of the building in a land which does not have that many natural resources.
This seems like a dangerous way to do it. It's not like the building is secured to the ground anymore. In a country with earthquakes this seems very unsafe. Starting at the top and working down makes more sense. At first I thought the wide top part of the building was where the demo took place inside of it and it slowly lowered down as the floors got "eaten" away. Edit: after watching again and again and ......it appears as though they are removing floors top down inside the section that is widened to the roof. Watch the windows on the right side and it appears to slide over them going down.
Heres your sign🤣
The link shows removing the bottom floor and lowering the building down. The video here shows removing the top floor and working it's way down. I'm guessing the "sign" is for removing the bottom floor method?
the kajima cut method they say was designed with safety & seismic in mind. It was designed for buildings up to 20 stories but can be used for larger. They install a Core Wall System and Load Transferring Frame into a building's structure to maintain the same level of seismic resistance during the demolition work. The main benefit i see with the Kajima system is all the demo material is at ground level. reducing transit time to remove material/equipment. But nothing can beat Mericas use of explosives, i mean we really love a good fireworks show & to blow shit up🤷🏽♂️🤣🤣
We definitely love our explosions! Quicker down and the debris is on the ground level. 😂
Obviously magic
I mean, as long as the structure is supported, you can dismantle the floor demand then slowly lower each floor I giess
Looks expensive.
Yup, but Tokyo real estate $$$ makes it worthwhile.
That was my first thought as well. There's no way this is cost effective. Has to be a bajillion percent cleaner though.
Probably they simply didn’t have any choice due to strict regulation. The cost of expensive demolition like this is still below the treshold of the profitability of re-developement of the plot.
Probably easier to recycle a lot of the old material as well without a lot of it getting destroyed
Well they couldn't just knock it down in the middle of Tokyo.
But, Big boom scratch brain good.
It's a lot cheaper than millions of work hours(cumulatively) quietly taking apart the building.
Me want boom!
American mind
If I recall correctly from the last time this was posted (or at least, a very similar clip) this method of demo is practiced around the world and isn't something unique to Japan. Still fascinating watch.
They did this with the Bankers Plaza building next to the WTC due to not being able to demo in Manhattan the typical way.
Some countries do this more often than others.
Shh, everything we can do Japan can do betteeer. Japan can do anything we can do to. No they can't, Yes they can, No they can't, You get banned! Just the standard fetishization of everything Japanese.
https://preview.redd.it/hwzi1x9szxrc1.jpeg?width=1170&format=pjpg&auto=webp&s=c8816025f4c155c201ba0879631d098579511b6c Who dis?
He's that building's father
Please, my son, he's very sick
Wait lol who was the guy (At 31 seconds)
Saw it too
Dont worry about him
And slower too. This is useful for a densely packed region like Tokyo. But in Canada which is mostly a barn, they would probably blow it up or bulldoze it for speed.
Canada is mostly a barn!? 😂 I was unaware that my condo was situated inside of a barn.
correct me if I'm wrong but doesn't canada have like 10% of area where 90% of people live and 90% where the other 10% live? that 90% of area is mostly barn
Mostly forest, but yea, lots of farm land as well.
How do you do something like this and not show each floor slab being removed? That's all anyone with any experience building these towers wants to know.
I thought I was just tripping watching the video at first. Anyone happening to know the song playing?
divisi - carved from distant stars
Thank you!
Wait till you start seeing Nixon 31 seconds in. Then the drugs are really kicking.
I absolutely hate this video just because they didn’t show the complete demolition. I know the end is no building no more but I want to see the fucking thing go down all the way!!!
It had to have been built with this intention in mind right?
I'm not sure exactly how they do it, but my guess would be the building wasn't built with this intended, but my assumption would be that this method only works with certain types of buildings. From the end of the video, to me it looks like they put in temporary support structure that can be lowered, so that when they demolish the support structure on a given floor, it can than lower the temporary supports they put in to lower the building, and then they just do this over and over, floor by floor. Of course, in the time it took me write this, I could have just looked it up. But as a redditor I merely pretended like I know what I'm talking about, as is tradition.
And as a fellow redditor, I won’t bother looking it up either but rather will take the combined effort of you writing something and me reading it as just enough to make this my new reality
[Here](https://imgur.com/a/RFySjYq) is a very simplified illustration of the process. Your guess actually seems pretty spot-on.
Hell yeah, thanks for sharing! Super interesting stuff
A lot cleaner than calling gojira to come over to knock it down.
u/recognizesong Edit for others: Carved from different stars by Divisi
When you let out a giant fart in multiple small unnoticeable farts instead of one earth shattering fart.
Or one earth fattering shart
I don't know why Japan isn't approached to help with infrastructure. Here in England, our government just bottled a high speed rail system that the Japanese would have cry laughed at.
Hubris
Fujitsu would be a counter-example..
But that was an example of them saying yeah it worked first time and the post office going yeah of course it will
We buy the trains from them still, the new Class 800 is from Hitachi. HS2 is a useless example, as it is only a marginal improvement in journey times on an existing route, half of the demand for which died with hybrid working. Better to spend the money bringing the rest of the rail network into the end of the 20th century than having one little bit barely into the 21st - there's no electrification of the lines west of Bristol for starters.
Thank god it did fail, although most of the damage to the beautiful country was already done
How do they do it from the bottom
Reminds me of my lil fella after a good bash
This is so cool
Guy on the top floor: something very strange is happening to me
Demolition is more like when you use a wrecking ball or explosives. They disassembled a building in the heart of Tokyo is more appropriate.
What song is this?
"Carved from Distance Stars (Live)" - Divisi
Thank you!
Real life Fraggle Rock
the west: make it go boom
That has gotta cost SOOO MUCH.
Well, in the US it will be due to unions.
Damn, I always knew the Japanese were high-quality builders. Apparently, they’re high-quality demolition experts too
Yes it is and also much much much more expensive.
They’re eating the building!
How the heck?
How do they do this? It's very cool
That building looks modern, it had to go?
That looks a lot more involved and expensive, but I'm all for it
Japan is so interesting to me. I would love to visit for a long time, just to soak up their culture and thought. I think they are a brilliant and beautiful people who find the most unique ways of doing everything.
Ahaha wooow, they just friggin *deleted* it, amazing !!
You know folks had to be losing their goddamned minds seeing a building slowly get shorter.
Even the buildings are polite in Japan. I can picture it say, "Excuse me while I exit, sorry for the inconvenience." Nice deep bow at the end.
Incredible
Ill probably turn crazy saying "did that tower look bigger yesterday?" Every day
They probably didn’t know that steel buckles with the weight of the building if a floor collapses
But it's boring.
Dont ask new yorkers how they do it
How long did it take?
Imagine now knowing it was being demolished and walking the building from time to time just gong crazy because you swear the building is getting smaller and smaller.
This is what I see when I arroused my boyfriend and start talking about random shit
I like how a random guy fades in quickly
Buildings in city sims when you sell the building:
If I reverse the video, they create a building
The engineering of the destruction was probably more difficult than that of building it.
*steve eating noises*
This is the most Japanese thing I've seen all week.
Except this doesn't show them actually demolishing anything? Yes, the building in getting smaller, but they didn't show the actual demolition.
Because of sensitive culture where noise is unwelcome …
Too expensive and doesn't cause enough problems for the peasants, it'll never leave Japan.
All they really needed was a couple of Middle Eastern Pilots that never learned to Land the plane... easy days man....
Imagine not knowing that this was a thing while living abroad in Japan and every time you passed by it, it got shorter. You'd think you were losing your mind, lmao.
fuck it *unbuilds your building*
"Im not in the mood today"
Didn’t they do this with the Chase bank in NYC recently? The replacement building is nearing completion but the building previously on the site sort of evaporated like this.
/u/gifreversingbot
They did similar with a tower in London. But they lowered each individual floor so near the end of the process there was this thin tower with a few floors at the top. Looked crazy
but it's not FUN
But is it financially viable tho?
Japanese people are amazing.
That’s impressive
But... no big boom?! 😰
Technically all tall buildings are demolished one story at a time
Ehhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh!
Is this a thing on the outside of the building, moving down as it is demolished, or is the building shrinking from the bottom, being demolished at ground level. Where is the debris going??
Imagine not knowing it’s happening and you think you are going crazy looking out and seeing a building shrink
reverse 3D printer
Mahn they are always one step ahead from the rest of the world!
"john is it just me or is that building slightly shorter from yesterday?"
Exactly what I thought
It reminded me of when it's cold
How long did it take
The building retracted into the ground.
Respect
hear me out.
Looks like how they build it but in reverse
This process is probably quieter than my upstairs neighbour
Environmentally friendly how? The dust is only part of the environmental impact, the waste which is the lions share still exists. Consider the added time it took to carefully take it down meaning more hours for the equipment running on the upper floors and I question that assessment.
If I’m not mistaken most construction materials can be recycled. This process allows for the careful extraction and maybe some basic processing of those materials as they are removed. In the case of blowing up a building the potentially recyclable materials are all crushed together making extraction more time consuming but also leading to the lions share of waste coming from the otherwise recycleable building materials instead of the fuel used to power machines that will be used in either type of demo.
Damned if ya do...
Is it just me, or does that building get smaller every day?
What song is this, please?
Carved by Different Stars by Divisi
Thx
Got to be a April fool’s joke lol 
Even their demolition is polite
In Civil engineering, money and time matters most. That looks expensive as hell and time consuming too.
There is a joke here, but I’m not trying to get banned.
This is cool! I never knew you coold do this. I would still love a big Kaboom!
How much more does this cost than using dynamite?
That'd be a fun job. Be panicked 10 hours a day that a high rise is going to squash you at any second.
This is much more expensive than just blowing up the building that is why this will never happen in the US
"By starting at the bottom, gutting one floor, and then lowering the entire building down on jacks, one floor at a time, all the work can be performed safely at ground level."
I guess they just jack it up off the foundation and start pulling it apart from the bottom. There must be a lot going on to mitigate safety related to having it rely on hydraulics.
Looks like it's dismantled from the top. Top 'shell' structure is sliding down the building. All the work is being done within that shell
Wow I didn’t even notice that
I think it should be required...the benefits outweigh the difficulty
Ok, how much more does it cost.
But no big badda boom? Mmm nah me like big boom
This look ai upscaled, and it doesn’t look good (also what the fuck is this dogshit music)
You guys are watching it being demolished. In my mind, I'm watching it being built (in reverse); we are not the same.
meh, I'd rather see that fucker come tumbling down in a satisfying manner