A Masterpiece of Functional Architecture
With Coeur Défense, French architect Jean-Paul Viguier has created a modern and functional complex. The impression is futuristic. The slender, towering skyscrapers with rounded corners remind one of twins or of a very tall couple. In front of the 180-meter-high twin towers with their 40 stories, stand three eight-storied buildings, each one 32 meters high. The whole complex is connected by a 40-meter-high atrium that gives it the stability it needs. Coeur Défense houses a reception hall, companies, stores and a conference center. There is even space for cultural events. The basement offers space for taxis and trucks, and the five subterranean stories have 3,500 parking places. In the interior of every building, 8 express elevators move unceasingly between the floors. It takes only 25 seconds to be catapulted from the ground floor to the 39th floor.
Cost Optimization was Decisive
Decision in Favor of SCHOTT‘s “Pyran S”
Rinaldi Structal, a subsidiary of Bouygues Batiment, commissioned the special glass producer and finisher SCHOTT Jenaer Glas GmbH, through the French sales company SCHOTT France, to supply the buildings with fire-proof glazing. Thanks to “Pyran S”, Rinaldi was able to achieve fire-proof glazing and a double glazing with pressure balance properties and integrated venetian blinds. Dominique Kienlen, research and development manager for Rinaldi Structal, explains the reason: “In order to prevent early aging of double glazing – something customers often complain about – we put all our efforts into creating dust- and condensation-free window pane gaps.” Owing to the way “Pyran S” is processed, Rinaldi was able to comply with the strict fire protection and safety regulations as well, while also preserving the aesthetics of the design.
In the area between both towers, “Pyran S” had to meet all requirements for G 60 glazing, whereas in the connecting areas between the façade and the glass wall, the fire-resistant class G 120 was required. The corresponding fire-proof glazings are expected to hold back flames and smoke for 60 and 120 minutes, respectively. The entire Coeur Défense complex profits from the outstanding properties that “Pyran S” special glass offers. Architect Viguier was able to break with the old architectural tradition of using darkly glazed, reflecting office towers in his office district of La Défense. He was able to achieve an aesthetic work full of transparency and openness thanks to 10,000 square meters of only 6-millimeter-thick “Pyran S”. With its extremely high degree of 92 percent light transmission, it was the perfect solution for the giant construction project of the new century.