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Posts Tagged ‘reconstruction’

Photo: Sabine Glaubitz/dpa/picture alliance.
Notre Dame’s spire is visible once again following the partial removal of scaffolding.

After the Notre Dame cathedral in Paris burned, there were many suggestions for rebuilding it with lots of modern features, but tradition mostly won out. Ancient craft processes and materials were used whenever possible. People from all over pitched in.

Stefan Dege writes at DW, “The fire was still raging at the Notre Dame Cathedral on April 15, 2019, when French President Emmanuel Macron vowed to renovate and reconstruct the medieval monument within five years. Since then, work on the Gothic Episcopal church has been in full swing and is apparently on schedule.

” ‘We are meeting deadlines and budget,’ Philippe Jost, the head of reconstruction efforts, told a French Senate committee in late March. …

“The cathedral is officially scheduled to reopen on December 8, 2024. Though it will not be ready in time for the Summer Olympic in Paris, as was initially desired, visitors to the French capital can once again see Notre Dame’s towering spire following the recent removal of the surrounding scaffolding. The lead roof is also currently being installed. Fire-prevention features, such as a sprinkler system and compartmentalized sections, are also part of restoration efforts. …

“Exactly five years have passed since the fire, which partially destroyed the historic building. The Paris fire department fought for four hours before it was able to confine the fire to the wooden roof truss. The west facade with the main towers, the walls of the nave, the buttresses and large parts of the ceiling vault remained stable, along with the side aisles and choir ambulatories. Heat, smoke, soot and extinguishing water affected the church furnishings, but here, too, there was no major damage. …

“The extent of the destruction was not as great as initially feared. ‘Thank God not all the vaults collapsed,’ German cathedral expert Barbara Schock-Werner told DW at the time. Only three vaults fell in the end, and there was a hole in the choir. …

“French donors alone pledged €850 million ($915 million) to help restore the landmark. But money and expertise also came from Germany, with Schock-Werner taking over the coordination of German aid.

Cologne Cathedral’s construction lodge restored four stained glass windows that had been severely damaged by flames and heat. The four clerestory windows with abstract forms are the work of the French glass painter Jacques Le Chevallier (1896-1987), and were produced in the 1960s.

“In the glass workshop in Cologne, they were first freed from toxic lead dust in a decontamination chamber. The restorers then cleaned the window panes, glued cracks in the glass, soldered fractures in the lead mesh, renewed the edge lead and re-cemented the outer sides of the window panels. …

“As dramatic as the fire was, a discovery by French researchers at the fire site was just as sensational: iron clamps hold the stones of the structure together. Dating and metallurgical analyses revealed that these iron reinforcements date back to the first construction phase of the church in the 12th century. This may make Notre Dame the world’s oldest church building with such iron reinforcement.

“But more importantly, the mystery of why the nave was able to reach this height in the first place has also been solved. When construction began in 1163, Notre Dame — with its nave soaring to a height of more than 32 meters (about 105 feet) — was soon the tallest building of the time, thanks to a combination of architectural refinements. The five-nave floor plan, the cross-ribbed vaulting with thin struts and the open buttress arches on the outside of the nave, which transferred the load of the structure from the walls, made the enormous height possible. …

“In a stroke of luck, the cathedral’s showstoppers — the statues of the 12 apostles and four evangelists that architect Eugene Viollet-le-Duc grouped around the ridge turret he designed in the 19th century — survived the fire unscathed because they had been removed from the roof shortly beforehand for restoration.

“Some 2,000 oak trees were cut down for the reconstruction of the medieval roof truss. To work the trunks into beams, the craftsmen used special axes with the cathedral’s facade engraved on the blade. These can be seen in a special exhibition in the Paris Museum of Architecture. The show also details the painstaking work that was required to reinstall stones and wood in their original places to make the reconstruction as true to the original as possible.”

More at DW, here. No firewall.

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Image: Casto Vocal
Virtual reconstruction of northernmost section of pre-Incan temple in Bolivia.

Here’s why a general education may equip the workforce of the future better than job-specific training: you never know what skills will be needed. In this example, a new breed of adaptable archaeologist is expanding the use of 3-D technology to reimagine lost worlds.

George Dvorsky writes at Gizmodo, “The 1,500-year-old Pumapunku temple in western Bolivia is considered a crowning achievement of Andean architecture, yet no one knows what the original structure actually looked like. Until now.

“Using historical data, 3D-printed pieces, and architectural software, archaeologist Alexei Vranich from UC Berkeley has created a virtual reconstruction of Pumapunku — an ancient Tiwanaku temple now in ruins. Archaeologists have studied the site for over 150 years, but it wasn’t immediately obvious how all the broken and scattered pieces belonged together. The surprisingly simple approach devised by Vranich is finally providing a glimpse into the structure’s original appearance. Excitingly, the same method could be used to virtually reconstruct similar ruins. The details of this achievement were published [last December] in Heritage Science.

“First, some background on the structure. Pumapunku, which means ‘door of the puma,’ was a temple designed and built by the pre-Incan Tiwanaku culture, who lived and thrived in what is now western Bolivia from 500 AD to 1,000 AD. …

“Pumapunku displayed a level of craftsmanship that was largely unparalleled in the pre-Columbian New World, and it’s often considered the architectural peak of Andean lithic technology prior to the arrival of the Europeans. …

“Unfortunately, the ruins of Tiwanaku, and the Pumapunku temple in particular, have been ransacked repeatedly over the past half-millenium. Archaeologists have virtually no idea what the structure actually looked like. None of the blocks that once comprised the original structure are currently located in their original place, and many of them are badly damaged or decayed. …

“To overcome these difficulties and limitations, Vranich and his colleagues integrated historical archaeological data with modern computer software and 3D-printer technology to reconstruct the ancient temple, and by doing so, devised an entirely new approach to reconstructing and visualizing ancient ruins that would otherwise be impossible to build.

“The team created miniature 3D-printed models, at 4 percent actual size, of the temple’s 140 known pieces, which were based on measurements compiled by archaeologists over the past 150 years and Vranich’s own on-site observations of the ruins. … The researchers could have performed this work exclusively in the virtual realm, but they had better luck with tangible, physical pieces they could freely move around.

“ ‘It was much easier to use the 3D-printed models,’ Vranich told Gizmodo. ‘You can quickly manipulate them in your hand and try position after position. It is much slower and less intuitive on the computer.’ …

“Satisfied with their Lego-like configurations, the researchers keyed their creations into an architectural modeling program, culminating in a single hypothetical model of the temple complex. This wasn’t terribly difficult, as the construction methods used by the Tiwanaku people, and how they formed their incredibly geometric stones, are well documented, explained Vranich. But the exercise yielded some new findings.

“ ‘What we found out is that it appears they were making prototypes for each type of stone type, and then would have copied one after the other. It’s almost like it was a pre-Columbian version of Ikea.’ …

“Another interesting finding was that the gateways scattered around the site were lined up in a way to create a mirror effect. That is, ‘one big gateway, then another smaller one in line, then another,’ he said. ‘It would create an effect as if you were looking into infinity in the confines of a single room.’ ”

Read more here.

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