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Notre Dame Officials Tap AutoDesk for Tech, BIM

Thursday, May 6, 2021

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Building software firm Autodesk recently confirmed in a press release that it will be helping Notre Dame Cathedral officials by contributing design and construction solutions to the rebuilding efforts, including BIM support and technical expertise.

According to the company, this partnership allows the conservation and restoration of the cathedral to enable cloud collaboration among stakeholders, making a common data environmental that will be the central point for project information.

“I warmly thank Autodesk for supporting the rebirth of Paris Notre Dame Cathedral. Using digital technologies designed for the supervision and management of the restoration site is essential for the public institution. Thanks to Autodesk’s patronage, the use of cutting-edge design and construction technologies and BIM, are being leveraged to help prepare for the reopening of the cathedral, and to once again welcome both pilgrims and visitors,” said the Army General Jean-Louis Georgelin, President of the public establishment dedicated to the conservation and restoration of Notre-Dame de Paris cathedral.

In addition to the collaborative support, data created using reality capture technologies prior to the fire allowed Autodesk to create a 3D BIM model of the Notre Dame Cathedral as it existed before the catastrophic 2019 fire. Autodesk has now used recent scans to create 3D models post-fire for comparison.

BIM

Building software firm Autodesk recently confirmed in a press release that it will be helping Notre Dame Cathedral officials with by contributing design and construction solutions to the rebuilding efforts, including BIM support and technical expertise.

“We are humbled to participate in the restoration and future preservation of the Notre Dame Cathedral, a truly magnificent architectural wonder of the world. Since the devasting fire two years ago, we have provided funding and technology to support the effort through the French Fondation du Patrimoine (Heritage Foundation) and this announcement reinforces our commitment,” said Nicolas Mangon, Autodesk Vice President of Business Strategy for Architecture, Engineering and Construction Design Solutions.

Fire Background

On the evening of April 15, 2019, flames engulfed the more than 850-year-old Notre Dame Cathedral, destroying the spire and nearly two-thirds of the roof.

With the help of about 500 firefighters battling the blaze, the fire was brought under control by the early hours of the following morning, five hours after the outbreak. Officials stated that no fatalities took place during the incident, and only one firefighter was reported to have experienced serious injuries.

There were no initial reports about what had caused the blaze, though police said at the time that it appeared to be accidental and that the cause could be linked to the ongoing 6-million-euro ($6.8 million) renovations. Since then, though, investigators have said they believe an electrical short-circuit is the culprit.

City and national officials have since been criticized for failing to fully disclose the risk of contamination as a result of 440 tons of lead roofing that had burned in the fire, which consequently sent clouds of lead particles into the air. Work was suspended for weeks over the summer, while the surrounding area underwent lead testing.

On Aug. 13, maintenance and cleanup practices commenced in Notre Dame’s 100,000-square-foot enclosed plaza and on surrounding streets.

The process involved vacuuming, scrubbing and rinsing the pavement and various surfaces using a highly pressurized water mixer combined with a special particle compound used to remove lead. The wastewater was then recovered.

On more dense surfaces like granite, workers used a special gel to coat the contaminated surface, which was left to dry for several days and is then removed, pulling out any lead particles that became embedded in the stone.

Although environmental associations, labor unions and other groups agreed that cleanup procedures should have begun months ago, new decontamination measures were established for workers at the cathedral. Through the use of foot baths, showers and wearing of disposable uniforms, workers were both more protected and less likely to spread toxic particles outside of the plaza. Strict check-ins and check-outs were also employed.

Restoration

President Emmanuel Macron has specified that he wants the monument to be rebuilt in time for the 2024 Summer Olympics, slated to be held in Paris. To aid this goal, digital 3D scans taken by the late Andrew Tallon of New York’s Vassar College in 2015 are believed to provide the necessary information for fast-track construction.

However, before restoration efforts can begin, the melted scaffolding needs to be taken down—piece by piece.

If the scaffolding were to fall or collapse, it could reportedly put other parts of the building in jeopardy, so workers will have to first build a structure above the scaffolding that will allow them to rappel down.

Officials began taking down the 50,000 metal tubes that make up the lattice in October. While they were dismantling the lattice, they were also installing planks above and below the cathedral’s ceiling for closer examination.

At the beginning of last year, the ultimate fate of the structure was still unknown.

In mid-March, the process was delayed because of the COVID-19 pandemic; however, French general Jean-Louis Georgelin, who is heading up the 40-person committee that is overseeing the restoration, told The Guardian at the time that the unexpected pauses in work should not impact the deadline.

Delays included specialist artisan builders being sent home as France went on lockdown, as well work being stopped before it began on the removal of the damaged scaffolding.

Georgelin had also noted that monitoring equipment attached to different parts of the structure indicated that there has been no movement in the last year.

At the end of April, the site was retrofitted for the virus, which included rearranging showers and cloakrooms as well as installing a place to eat. In addition, most workers were staying at vacant hotels in order to not use public transportation.

Work officially resumed at the site in May.

In June, the dismantling process restarted. Two teams of five workers each took turns descending on ropes into the scaffolding, which was made up of 40,000 pieces, and cut with saws through the metal tubes that fused together. The pieces were then lifted out via crane.

GodefroyParis, CC-SA 4.0, via Wikimedia Commons

In addition to the collaborative support, data created using reality capture technologies prior to the fire allowed Autodesk to create a 3D BIM model of the Notre Dame Cathedral as it existed before the catastrophic 2019 fire. Autodesk has now used recent scans to create 3D models post-fire for comparison.

Most recently, at the beginning of this year, new scaffolding was being erected as decontamination and cleaning continues ahead of restoration and rebuilding work.

The cleaning is especially important as the lead roof was a casualty of the fire, billowing yellow smoke into the air and coating the entire area with lead dust, causing the surrounding neighborhood to be decontaminated afterward and an immense amount of precaution chained to the work that takes place inside now.

One technology that workers are considering implementing is lasers. Chicago-based GC Laser Systems, led by art restoration expert Bartosz Dajnowski, was texted inside the structure in the fall.

The technique is used with the goal of weeding out contamination without using chemical or mechanical abrasion.

Design

Possible design changes for the cathedral’s spire erupted just days after the fire, and French Prime Minister Edouard Philippe even launched a spire design competition, saying that instead of recreating the original spire, the city hoped to create a new design that is “adapted to the techniques and the challenges of our era.”

Since the spire was not a part of the original structure, or even the first spire built for the cathedral—the first spire was believed to be built between 13th and 18th centuries, and was removed due to wind damage; the second spire was added during the 19th century restoration by French architect Eugène Viollet-le-Duc—questions about replicating the tower arose.

The founder of Farshid Moussavi Architecture (London), Farshid Moussavi said that a new opportunity has been presented in bringing together talent and donations to rebuild Notre Dame, much like when the structure was originally built.

“The rebuilding of Notre-Dame is an opportunity to expand that history,” Moussavi said at the time.

“Whereas the political landscape in the Gothic era was based on each country competing with each other to show their piety, today, we can come together as an international community to rebuild Notre-Dame because it is a world heritage landmark.”

Since then, several ideas have been revealed, including: Italian architects Massimiliano and Doriana Fuksas proposed a contemporary roof and spire made from Baccarat crystals that would be lit up every evening; French designer Mathieu Lehanneur proposed a golden, fire-like structure; Bratislava-based Vizumatelier proposed a lightweight tower that would shine a beam of light directly upward; Cyprus collaborative architectural studio Kiss The Architect suggested various arches and balls wrapped around a central staircase-type spire; and Paris-based architects Studio NAB have submitted a design proposing a greenhouse and educational apiary to sit upon the damaged landmark.

However, about a month after the fire, the French Senate passed a bill that would require the cathedral to be rebuilt to its “last known visual state,” a move that pushed back against the proposed innovation for the structure.

The legislation was introduced in order to allow for the fast-tracking of reconstruction that Macron proposed. However, some other facets were changed as well, including a clause that would give the government the power to override regulations on planning, environmental and heritage protection and public tenders, according to The Local.

The law also dictates that the government create a “public project” to oversee the construction project, overseen by the Ministry of Culture.

In July of last year, Macron dropped the idea of a modernized spire.

However, along with the cleaning update at the beginning of the year, aesthetic debate was still raging when a draft of plans was published in the French media. Some proposals included replacing the historic glass-stained windows in the chapel’s nave with more contemporary ones.

Other significant changes include furniture and different lighting, which prompted immediate dissent from members of the French public. So much so that the Archdiocese of Paris published a press release, restating that the ideas were only a draft with the intention on allowing visitors to better experience the cathedral.

The restoration team is still shooting for the first Mass to be held on April 15, 2024, the five-year anniversary of the fire.

   

Tagged categories: Accidents; EMEA (Europe, Middle East and Africa); EU; Fire; Historic Preservation; Historic Structures; Maintenance + Renovation; Renovation; Restoration

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