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  #61  
Old Posted Aug 22, 2013, 2:00 PM
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With a big view of the skyline;
A hole in the skyline is disappearing


La Défense Skyline par -pieton-, sur Flickr
     
     
  #62  
Old Posted Sep 13, 2013, 10:34 AM
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So now they put chips within concrete... Gather round, I took the time to translate for geeks on here, although being unfamiliar with some technical terms in there.

Quote:
Originally Posted by batiactu.com
The D2 tower believes in concrete 2.0



The site of the D2 tower is moving fast: first high-rise building with metallic exoskeleton and concrete core in the district of la Défense, it is a testing ground for several innovative technologies as well. Self-consolidating (or self-compacting) concrete (SCC) in use to implement the core embed some RFID (radio frequency identification) chips to provide some data helpful to material traceability.

The D2 tower, erected on the site of the former Bureau Veritas building (now demolished) at la Défense is an odd project in more ways than one. This 171-meter (561 ft) tall office tower is the first one of the business district to take up a mixed structure made of a steel exoskeleton and a reinforced concrete inner core. "The D2 tower will be provided with a terraced garden (at the top) and some light animation on the facade at night", states GTM Bâtiment deputy project manager Philippe Rouchette. The rounded shape of the building cladded with diamond mesh brings "a geometric complexity to the nodes of the facade", he says. The design requires glass and coating to be put up at a pace of 3 floors, which the progress of the whole construction work shows: "the core is ahead by roughly 3 floors of the steel skeleton, which itself is ahead of the facade by the same", says Philippe Rouchette.

"The 6,500 m³ (literally 1,429,797.2 gal, I guess) foundation raft was carried out to a thickness of 3 m (around 10 ft for sure) in ready-mixed SCC to improve the work conditions, reduce noise pollution and speed up implementation", Rouchette explains. According to him, the rate of that implementation would be of 80 m³ per hour and per pump instead of 25 m³ for a more regular method with vibrators (17,600 gal instead of 5,500). "There was simply no vibrator at all on the site! SCC was used for the raft, for vertical walls of which the thickness goes up to 2 m (~6.5 ft) and for pillars." They had to choose some new options due to the dimensions of the structure, like the implementation of the core with SCC within a self-climbing formwork. And innovations won't stop there: concrete is "traced" (literal translation) in order to make a "connected" building of the tower.

RFID chips as DNA carriers of the structure
Thus, RFID chips were embedded in the concrete mix of Lafarge's plant in Nanterre. A method allowing an undeniable identification of fresh then hardened concrete, within its bulk, to ensure the kind of it, hence its quality and its location in the structure. "Permanent traceability for casted concrete allows to watch the material quality, including standards for environmental certifications, for it is possible to append some metadata", argues Philippe Rouchette. "There are increasing requirements for traceability in construction", adds Pascal Marpeau, the marketing manager of Lafarge's industry department who raises computerization and fast access to data as reasons. Passive chips, of just a centimeter or so (half an inch) in diameter are encapsulated within a plastic shell to resist environmental constraints (pH, temperature, mechanical constraints and so on). A specific reader transmits radio frequency (RF) turning chips on in a short distance (15-20 cm) by supplying them with power. Then in return, it identifies every chip provided with a unique serial number which all needed data match with: delivery number, concrete plant id, concrete trade name, production date and time... Around 2 chips are introduced into the mixer for each cubic meter of concrete, so that the distribution in cast is homogeneous. "The amount of chips is a function of the dimensions of a structure and the number of detections per square meter that a customer wish", Lafarge specifies. As for collecting data, a reader may be set to the chute of a mixer truck to make sure proper concrete is casted on the right spot, whilst a portable reader may be used to collect data from hardened concrete.



Endless possibilities
Therefore this new technology allows to quickly collect some data about concrete by a non-destructive way, moreover to unlimited storage, during the entire lifetime of a building. In 2014, more data might even be added: volatile organic compounds (VOC) emissions, origin of a material, proportion of recycled materials, environmental and health specifications (something of the French administration), carbon footprint, records of post-delivery quality control... Possibilities are endless. Interesting to the cement company (Lafarge) that's planning data collecting and storage new services to watch what would be the DNA of the structure, up to the time of deconstruction and waste treatment. Given the rapid progress of technologies, snapshots of an entire structure with geolocation of each chip are conceivable within a relatively close future. Enough to interest many stakeholders: construction companies, building owners, real estate managers, insurances... Construction is thus witnessing, in turn, a digital revolution.



Diamond mesh
The weaving of the metallic mesh that wraps up D2 draws some diamond pattern sticking to the curves of the building. Each half of a diamond (so that's an isosceles triangle indeed) is 3-story tall. The facade is gradually adorning itself with glass and protective coating thanks to specific tools and some well planned logistics.



Exoskeletal structure
The steel framework weighs 5300 tons, including the 2000 tons of the exoskeleton drawing the diamond (or X) mesh. Above seen in close up, fitted with its protective coating.



IGH (immeuble de grande hauteur, that just means high-rise building)
D2 will be topped out at 171 m. Exclusively for office purpose, it will host 3750 people over 38 floors (French: R+37).



Inner core
Overview of the concrete inner core containing elevator shafts, staircases and technical rooms, which frees up all the surrounding space on floors.



Steel and concrete mixed structure
Mixed floors are supported by steel joists.



Reading RFID chips
A portable reader lets one scan the ids of RFID chips drowned in the concrete bulk of vertical walls. Once an id collected, it leads to the matching data like origin of concrete, concrete type and traits, date and time of production and so on.



RFID chips
Chips are 1.2 cm in diameter and don't affect the traits of concrete that embed them. Around 4 chips per batch are necessary to ensure reading afterwards. Reinforcement increases interference.



Foundation
D2 sits upon the Alsace technical gallery serving the district of la Défense, especially for steam. That required the implementation of 86 deep foundation strips (23 m, 75 ft deep) on either side of the gallery and of concrete structures that span it.

Complete
D2 will be complete by mid-2014. It will be crowned with a 30 m tall steel structure that will contain some technical rooms and a terraced garden (non-accessible).
French original: http://www.batiactu.com/edito/la-tou...n-20-36035.php

Okayyy... The building is tall but obviously nothing exceptional regarding the size of the structure, so I'm wondering what actually prompted them to use their SCC jointly to their self-climbing formwork, if that's even anything new. There's one sure thing, high-rise structures mixing steel and concrete are very unusual over here, it's the first one I see. So far, it had mostly (if not always) been full concrete structures. Notice that reinforced concrete, which France is seemingly deeply in love with, was invented by French gardener Joseph Monier. Besides, the tower is really closely surrounded as the area is now quite dense.

Now Lafarge is of the typical kind of friendly companies to me: jobs in France performing good results and innovative stuff indeed in their business.

Finally, notice they coated steel joists with something on every floor. Except for the exoskeleton, the entire steel structure is coated in that thing. I know neither why nor what that is. Maybe for local safety standards, but that's only my guess.
     
     
  #63  
Old Posted Nov 13, 2013, 8:37 PM
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Almost topped out...


Picture by Milo.
     
     
  #64  
Old Posted Nov 13, 2013, 10:01 PM
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Nice, I'm a sucker for X bracing/diamonds.
     
     
  #65  
Old Posted Nov 19, 2013, 10:14 PM
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Self rising cores are cool, but there not new, we've been using them for a few years in New York and London. I like this tower, but it looks like a blatant copy of the gherkin tower (30 st Mary's axe) in London, the shape and even the diamond facade is an exact copy, but the gherkin has better cladding to me
     
     
  #66  
Old Posted Nov 20, 2013, 12:49 AM
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Amazing tower.
     
     
  #67  
Old Posted Nov 20, 2013, 1:12 PM
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Quote:
Originally Posted by hughesnick312 View Post
Self rising cores are cool, but there not new, we've been using them for a few years in New York and London.
Uh, same over here, I believe. They were talking about the traits of concrete in use, if I'm not mistaking. And yes, it's seemingly widely inspired by the London gherkin. Meh...
For once that London finally inspires something to Paris, you should be glad, don't you think?
     
     
  #68  
Old Posted Jan 7, 2014, 7:34 PM
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By piéton.





From the other side.



That segment of the boulevard is as unfriendly as what you see for now, and I hope it goes on like this for long, the time for it to become a glory.
     
     
  #69  
Old Posted Feb 2, 2014, 11:44 AM
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Yesterday by Vincent92000 on pss-archi:





















Thanks to Vincent for these.
     
     
  #70  
Old Posted Feb 12, 2014, 7:12 PM
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Pss-archi member Vincent went up to the top of Majunga that's not even complete yet and took these showing D2 undergoing the work on it's cap.











Simply the best possible view to check that work out.
     
     
  #71  
Old Posted Feb 12, 2014, 9:22 PM
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Yes, a really great view.
I wanted to take picture from Puteaux today but the rain deterred me.
I hate the weather these days, a blue sky and few minutes latter a rainstorm.
     
     
  #72  
Old Posted Mar 9, 2014, 1:15 PM
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Why was this thread closed?

Updates, 3/7

Quote:
Originally Posted by cochise75 View Post
By Indy G :







By Vincent1746 :

     
     
  #73  
Old Posted Mar 27, 2014, 8:54 PM
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Today



     
     
  #74  
Old Posted May 3, 2014, 4:16 PM
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Ah yea, you guys may be curious about D2's top completion, though.
So Vincent had a little walk under la Défense's grey sky yesterday and posted these on pss-archi.eu.



That CGI logo is insanely tacky at the top of their smaller green tower that yet looks cool, but Bouygues and Sogeprom won't leave theirs to the top of D2, huh. That's just some temporary advertising.







Below, they're putting up the little LED lamps to the façade that should nicely dress the tower up with glitter at night.



And, we're still waiting for Aurore to the left to be demolished to make way to Air²... Dang, it's been slow.





Hé! Guys, beware of that boulevard. For more towers are planned along, and my guess is it's finally going to be a formidable deep canyon to embody our local wealth and economic strength in a more contemporary and bigger fashion, in addition to what the historic central city has to offer.
Right there is some kind of USA-like way, right?







Only, locals still have to really appropriate that kind of bigger stuff. The fact that most tower feet are completely closed to the few pedestrians going there is still showing.

Many thanks to Vincent again.
     
     
  #75  
Old Posted Jul 6, 2014, 6:52 AM
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The top is weird, some sort of sloppy design.


ludoboy

There's a little garden as initially planned up there, though.

















More pictures like some interiors and views on leparisien.fr.

From farther away.


vincent1746

Hé, the river is cleaner and cleaner, that allowed a whole bunch of species of fish to come back and live there yet. You might even be allowed to swim in there sometime kind of soon, without having to undergo half a dozen of vaccines. But maybe not on that very spot, eh.
     
     
  #76  
Old Posted Sep 27, 2014, 11:39 AM
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From Eqho's 25th floor.





From Carpe Diem's 36th.









Pictures by Vincent.

Below by jaimeleraï.



     
     
  #77  
Old Posted Sep 27, 2014, 11:44 PM
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The building looks awesome. Great updates! Are the gardens at the top public?
     
     
  #78  
Old Posted Sep 30, 2014, 10:31 AM
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^ Unfortunately, no. It should be open to the employees of the tenants exclusively, and maybe not even all of them. It sucks. There's that kind of sorry, distrustful and paranoid trend to make some sort of fortress of every building over here, whether offices or residential.

However, some commercial/retail room is planned at the foot of the tower, as well as in Carpe Diem and in Saint-Gobain. A first step to make towers feel more friendly and more open to the general public locally, also necessary to improve the boulevard.
     
     
  #79  
Old Posted Sep 30, 2014, 7:04 PM
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Unhappy Another lost opportunity for a public view

Quote:
Originally Posted by mousquet View Post
^ Unfortunately, no. It should be open to the employees of the tenants exclusively, and maybe not even all of them. It sucks. There's that kind of sorry, distrustful and paranoid trend to make some sort of fortress of every building over here, whether offices or residential.

However, some commercial/retail room is planned at the foot of the tower, as well as in Carpe Diem and in Saint-Gobain. A first step to make towers feel more friendly and more open to the general public locally, also necessary to improve the boulevard.
That is unfortunate as it would have made for a great vantage point.
     
     
  #80  
Old Posted Mar 11, 2015, 10:34 AM
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Quote:
Originally Posted by vincent1746 View Post
Today :















     
     
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