New construction of the Büttenen school complex, Luzern

2009

According to a decision of the Lucerne City Council, the small school building in the residential district of Büttenen was to be demolished and not replaced. The children would have had to go to a school much further away. The solution?

Facts and images
Construction Data
Involved
Articles
Exterior view facade; Photo: Roger Frei, Zurich
Exterior view facade; Photo: Roger Frei, Zurich
Interior view; Photo: Roger Frei, Zurich
Interior view; Photo: Roger Frei, Zurich
Work niche with cantilevered BSH beam
Work niche with cantilevered BSH beam
Overhanging floor slab in the area of the entrance
Overhanging floor slab in the area of the entrance
Exterior view from Büttenbergstrasse
Exterior view from Büttenbergstrasse

The project
The affected residents of the neighborhood successfully resisted and convinced the parliament to erect a new school building. The new school building was to be built of wooden elements, and its architectural design was to give it a light, attractive appearance. With the idea of building the schoolhouse closer to the street, a large break area with a lot of green space was created. To ensure that the new building is also in harmony with the green surroundings, the school building was built according to the Minergie-ECO standard. The building consists of a basement in solid construction and two upper floors in wooden element construction. The generously designed, bright classrooms placed high demands on the structural concept.

The construction method
Due to the geometry and the arrangement of the classrooms, the ceiling had to span 7.3 meters, the roof even 9.0 meters. These large spans could be achieved with box-girder ceilings made of ribs in glulam and planking of three-layer boards and OSB boards. The high forces of the cantilevered ceiling were taken up by box girders made of Kerto-Q panels. The loads were transferred from the floor elements to beams, some of which are integrated into the box girder floor.

The challenge
In order to design the large cantilevers and distribute the forces to the pile foundations, high beams made of glulam were inserted in the roof as well as in the floor slabs. Another highlight were the round skylights: due to the filigree support in four points, the skylight roof seems to float on the surrounding light band.

Construction Data

- Timber: 120 m3

- Kerto-Q for wooden ceilings and beams: 12 m3

- Three-layer boards for box-girder ceilings: 1320 m3

- OSB boards for wooden box ceilings: 830 m3


Services of Timbatec

- SIA Phase 32 Construction project

- Statics and construction

- SIA Phase 51 Implementation project

- Technical site management and site inspections

Owner
Structural Engineering Office of the City of Lucerne
6000 Lucerne


Timber constructioncontractors
Zimmerei Kühni AG
3435 Ramsei


Timber construction engineers
Timbatec Holzbauingenieure Schweiz AG, Thun
3600 Thun


General Contractor
Starck AG, General Contractor
6340 Baar


Architect
Rohrer Sigrist Architekten
6003 Lucerne



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