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Sumit Singhal
Sumit Singhal
Sumit Singhal loves modern architecture. He comes from a family of builders who have built more than 20 projects in the last ten years near Delhi in India. He has recently started writing about the architectural projects that catch his imagination.

Schuman Bridge on the Saône in Lyon, France by Explorations Architecture

 
March 5th, 2015 by Sumit Singhal

Article source: Explorations Architecture

Inaugurated by Explorations Architecture in November 2014, the Schuman bridge is the 17th bridge built on the Saône in Lyon. The international competition for the Schuman bridge, held in 2009 by the Urban community of Lyon (Grand Lyon), brought together designers such as Renzo Piano, Marc Mimram and Dietmar Feichtinger.

Image Courtesy © Michel Denancé

Image Courtesy © Michel Denancé

  • Architects: Explorations Architecture
  • Project: Schuman Bridge on the Saône
  • Location: Lyon, France
  • Photography: Jacques Leone, Michel Denancé
  • Project owner: Grand Lyon (Urban community of Lyon)
  • Superstructure Design: Flint and Neill
  • Infrastructure Design: AIA Ingénierie
  • Lighting design: Les Eclairagistes Associés
  • Total length: 180 m, (2 spans of 85 m)

Image Courtesy © Michel Denancé

Image Courtesy © Michel Denancé

  • Deck Surface: 5000 m², Deck width varies between 26 and 30 m
  • Roadway width: 12 m uniform, “Soft” mode sidewalk width varies between 4.50 and 6 m, Composite deck thickness varies between 50 and 70 cm
  • Support structure width: 1.60 m uniform
  • Arch height: 11 m at the top of the arch
  • Steel tonnage: 2800 T
  • Construction cost: 25 M€
  • Important Dates
    • November 2009: invitation for proposal
    • May 2012: start of the bank development project
    • January 2013: start of framework fabrication in Italy
    • September 2013: start of framework assembly at Edouard-Herriot port in Lyon
    • November 2014: bridge is operational
Image Courtesy © Michel Denancé

Image Courtesy © Michel Denancé

Location
Constructed along the narrows of the Saône, an area named World Heritage site by UNESCO, on the boundary between the city and a more rural landscape, the Schuman bridge is the new entryway to the historic center of Lyon. It connects the banks of Vaise to those at the base of the bluffs of Croix Rousse and is situated between the Masaryk bridge and the “Ile Barbe” bridge. These remarkable works of civil engineering, the oldest two bridges in Lyon, dating back to the early 19th century, are characterized by their unique appearance (bridges suspended from a central pillar) and dignified elegance. Due to their close proximity, there is significant interplay between the Masaryk bridge and the Schuman bridge.
Unlike the Masaryk bridge, whose stone pillar forms a “ridge”, the Schuman bridge seeks to open up the center of the river with two arches that plunge below the deck at mid-span. These arcs define an open area, a place above the river designed to become a small public area or viewpoint.

Image Courtesy © Michel Denancé

Image Courtesy © Michel Denancé

Structure
The bridge is as slim, light, and transparent as possible, in order to facilitate its integration into the urban landscape, concentrating the forces on the central support in order to gently touch down upon the banks.
The arches, the architectural challenge of the project, consist of triangular sections of steel casing with variable inertia, creating a line that shifts according to the viewing angles and the time of day.
The thinness of the deck (70 cm at the thickest point) is achieved thanks to a composite structure (steel/concrete)
meeting the combination of geometric constraints of the surface and underside
(accessibility for people with reduced mobility and passage above the navigation channels).
The sidewalks located on either side of the structure help to refine the profile; they are treated by steel casings, in the form of a tapered blade, cantilevered over the Saône. In the center of the structure, they expand and offer a place for contemplation. Stainless steel benches placed along the path dot the crossing.

Image Courtesy © Michel Denancé

Image Courtesy © Michel Denancé

Traffic
The various bridge users (pedestrians, bicycles, and cars) move about at the same level, as in a street. This friendly coexistence between modes of travel ensures the continuation of the city on the river. Cars drive in the center of the structure while the “soft” modes of transportation (pedestrians and cyclists) proceed along the sidewalks separated from the road by the structure of the bridge. This simple feature keeps the views of the river open at all times, creating a sense of comfort.

Nighttime ambiance
At night, road and sidewalk lights are directed towards the ground; their reflection subtly highlights the superstructure. The roadway light fixtures, developed specifically for the bridge, are placed about 40 cm above the ground and provide a uniform raking light.

Image Courtesy © Michel Denancé

Image Courtesy © Michel Denancé

Image Courtesy © Michel Denancé

Image Courtesy © Michel Denancé

Image Courtesy © Jacques Leone

Image Courtesy © Jacques Leone

Image Courtesy © Jacques Leone

Image Courtesy © Jacques Leone

Image Courtesy © Jacques Leone

Image Courtesy © Jacques Leone

Image Courtesy © Jacques Leone

Image Courtesy © Jacques Leone

Image Courtesy © Explorations Architecture

Image Courtesy © Explorations Architecture

Image Courtesy © Explorations Architecture

Image Courtesy © Explorations Architecture

Image Courtesy © Explorations Architecture

Image Courtesy © Explorations Architecture

Image Courtesy © Explorations Architecture

Image Courtesy © Explorations Architecture

Image Courtesy © Explorations Architecture

Image Courtesy © Explorations Architecture

Image Courtesy © Explorations Architecture

Image Courtesy © Explorations Architecture

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Category: Bridge

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