The Concrete, Steel and Timber Foundations of the Zurich Kongresshaus (1937–39)

Abstract

This article brings to light historical records from the Robert Maillart Archive at ETH Zurich, which documented the construction and detailed testing of various foundations and piles for the Zurich Kongresshaus by Haefeli Moser Steiger Architects (HMS). As one of the three project engineers from Conzett Bronzini Partner AG who was involved in the Kongresshaus’ current restoration and extension, the author’s first-hand experiences and site photographs further supplement these historical records. The author’s own accounts arise from observing the construction of new piles, and also from working with and repurposing the building’s historical foundations. This article therefore aims to form an archaeological catalogue and review of the Kongresshaus’ foundations. In doing so, different materials and techniques are addressed, reflecting a range of both traditional practices and modern technology in the Kongresshaus’ construction. This work further offers valuable insights and examples for future projects and interventions within existing heritage buildings, including those located further afield with similarly challenging sites.