Apartment houses Unterhub, Zollikerberg
2021
In the case of the apartment buildings on the lower right bank of Lake Zurich, the advantages of TS3 technology and timber construction are both noticeable and visible: the construction method allows flexible room division and timber ceilings that run from the inside to the outside without complex cantilever connections.
The project
The above-ground building is a timber structure consisting of timber columns and cross laminated timber panels connected with TS3 technology. Timber Structures 3.0 technology, or TS3 for short, is a process that allows large areas to be made of wood - without the joists that were previously common. TS3 connects glulam panels to each other via their end faces in a flexurally rigid manner. The floor slabs rest only on the columns, which are usually positioned in the exterior walls, and the staircase core. The rooms can thus be designed very flexibly. In the model on image 3, the columns, the few load-bearing walls and the TS3 joints can be seen. A total of 520 meters of TS3 joints were created.
The construction
The TS3 connection by means of joint grouting allows the construction of joist-free skeleton building structures made of wood with slender, point-supported slabs. By activating the secondary bearing direction, the same ceilings can be built with wood. Because of the low thermal conductivity of wood, there is no need for elaborate cantilever connections. The CLT panel can easily run from the interior to the exterior. The concrete stairwell braces the building.
The challenge
The column-free and partially cantilevered balconies were a challenge in the structural analysis.
Construction Data
- OSB 15 mm 690 m2
- DSP 27 mm 980 m2
- C24 (Construction timber) 58 m3
- GL24h 30 m3
- TS3-CLT (200 mm) 343 m3 (1720 m2)
- CLT (various thicknesses) 33 m3
- TS3 joint 520 m1
Construction costs
- BKP 1-9:
- BKP 2:
- BKP 214:
Services of Timbatec
- SIA Phase 32 Construction project
- SIA Phase 31 Preliminary design
- SIA Phase 41 Tender and comparison of offers
- SIA Phase 51 Implementation project
- SIA Phase 52 Execution
- Fire protection planning
- Technical planning building physics
Client
Hirs Immobilien
8702 Zollikon
Architect
Merkli Degen Architekten ETH
8053 Zürich
Timber construction engineer
Timbatec Holzbauingenieure (Schweiz) AG Zürich
8005 Zürich
Timber construction
Holzbau Oberholzer GmbH
8733 Eschenbach SG
Building physics
Timbatec Holzbauingenieure (Schweiz) AG Zürich
8005 Zürich
Photography
Elisa Florian Fotografie
Design in concrete, build in wood
Hochparterre online, 12.06.2023 – The «TS3» building system enables timber constructions without beams and load-bearing interior walls. At the brownbag lunch at the Baumuster-Centrale Zurich, developers and architects showed what is possible with it. (Report in german)
