The new Brüderhofweg replacement buildings are spread over four subdivisions built on both sides of Brüderhofweg in Zurich-Unterstrass. The execution phase took place in two stages. The buildings consist of a basement, a ground floor and three to four upper floors. The top floor was generally constructed as a stepped-back attic structure.
A total of 288 new rental apartments were built, and there are also spaces for other uses such as community rooms, a bistro and a day care center. In the basements of the subareas TG1 and TG2, large underground garages were realized in addition to cellar, storage and technical rooms. The open spaces between the buildings serve as access and green areas.
The vertical loads are mainly transferred into the building ground via the supporting cores as well as additional wall plates and columns. Above the underground garages, the vertical loads are supported by a 70 cm thick reinforced concrete slab. The cores are used for horizontal bracing. All staircases are realized in fair faced concrete. Columns, stair flights and balustrade elements were designed as prefab concrete elements.
Due to the settlement-sensitive subsoil, the foundation had to be carried out as a deep foundation using approx. 10 to 15 m long drilled piles, which were designed as displacement piles. In areas subject to low stress (outside air intake, escape tubes, etc.), a foundation using micropiles was possible. Depending on the existing terrain profile, a combination of soldier pile wall, builder’s soldier pile wall and conventional embankment was used to close the excavation.