Werner Lorenz is giving the keynote at “Footbridge_2025” in Chur (Switzerland).

Under the title “Shifting values – repair and reuse,” the coordinator of SPP 2255 discussed the background and guiding principles of this value shift, which is central to the work of SPP 2255.

The series of Footbridge Conferences has established itself as an international forum for the latest developments in pedestrian bridge construction. Engineers and architects from around the world come together to exchange ideas in this subfield of construction, which is particularly open to innovative approaches. For this year’s conference in Chur, Switzerland, Werner Lorenz was invited to deliver a keynote. Under the title “Shifting values – repair and reuse,” he addressed the background and guiding principles of an approach that is also central to SPP 2255: preserving and continuing existing structures rather than demolishing and rebuilding.

After Berlin (2019) and Madrid (2022), the Swiss city of Chur was the host of Footbridge_2025. The choice of location was justified, among other reasons, by the high density of impressive historical and modern bridges in the surrounding canton of Graubünden, but above all by the fact that one of the world’s most prominent bridge builders, Jürg Conzett, is based here—teaching and, most importantly, building. Well over 200 participants attended the lectures and presentations from September 3 to 5, which covered the full range of different aspects of pedestrian bridge construction. The conference concluded on September 6 with a excellently organized excursion to outstanding bridges in the area, some of which have gone down as milestones in the history of structural engineering.

In his keynote, Werner Lorenz drew attention to a topic that has long been taken for granted in SPP 2255 but remains rather marginal in pedestrian bridge construction: preserving and continuing existing (bridge) structures as an alternative to their premature demolition and replacement. Referring to this year’s Venice Architecture Biennale, he began by noting that such concepts now enjoy top priority in construction in general, yet in bridge building they still play only a minor role. From a historical perspective, this is particularly puzzling: repair and maintenance were widespread practices for millennia, and it was only with late modernism that the idea of the fundamental superiority of new construction (compared to the development of existing structures) gained prominence.

In the second part of the keynote, Werner Lorenz outlined several central guidelines for a fundamentally new approach to 21st-century construction, one increasingly committed to preserving the existing built environment—a profound shift that has become unavoidable in practice under the “sustainability turn,” while also opening up new ways to incorporate cultural heritage considerations. The text of the keynote is available for download.

Werner Lorenz startet seine Keynote (© Wilfried Dechau 2025)

Keynote

Lorenz_Keynote_Chur_250904

Further Workshop Aktivitäten


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