Landratsamt Rems-Murr-Kreis, Waiblingen
a+r Architekten, Stuttgart
Mayer-Vorfelder und Dinkelacker Ingenieurgesellschaft für Bauwesen GmbH & CO KG, Sindelfingen
EGS-plan Ingenieurgesellschaft für Energie-, Gebäude- und Solartechnik mbH, Stuttgart
Kuhn Decker GmbH & Co. KG Ingenieure und Architekten, Böblingen
HBH Holzbau Zimmerei GmbH, Landau/Isar
5
No
Office
approx. 5.964 m²
approx. 15.420 m²
17.092 m²
January 2023 to January 2025
January 2025
The new district administration building in Waiblingen harmoniously complements the ensemble of buildings comprising the existing pagoda, Villa Roller and the police building. The new building picks up on existing building lines. Care was taken to ensure an appropriate distance between the building and the neighbouring Villa Roller. The new building thus rounds off the surroundings to form a calm overall figure. In order to strengthen the building as a landmark, it is raised by an additional storey, which is set back slightly.
The district administration has set itself the goal of becoming climate-neutral with its district-owned properties by 2030. The building was therefore constructed using a timber hybrid design. However, the timber construction is not visible from the outside: the façade above, which fully encloses the first to third floors, consists of an irregular alternation of closed photovoltaic elements and windows. They are also staggered across the storeys. The storeys are separated by a belt cornice in a contrasting colour.
The timber hybrid building has reinforcing concrete cores in the inner zone. Consultation rooms, ancillary rooms, WCs and the stairwells are located in this centre zone. The timber hybrid ceiling extends from the core to the timber supporting structure on the façade. The well-lit office zones are located in this area. The innovative 3-zone concept was implemented throughout the building, which distinguishes between a public visitor zone, a semi-public consultation zone and an internal office zone. This makes it possible to realise an open office structure without corridors and cubicle offices. This is a very flexible structure. The structure saves space and enables every workstation to be designed with disabled access in mind.
From the ground floor upwards, the office building is designed as a timber hybrid construction. A modular concept with simple joints was chosen for this. The individual components remain recognisable in their materiality, as timber or exposed concrete.
Modular structure of the load-bearing components – façade and ceilings
The ceilings are realised as wood-concrete composite ceilings with board stack acoustic elements as finished exposed ceilings on the underside. The milled recesses serve to improve the room acoustics. The concrete on top serves to fulfil the fire protection requirements for R90, improves the sound insulation and ensures the disc effect of the ceilings for bracing. In addition, the absorber inserts on the underside of the ceiling were made of mineral wool to improve the fire protection behaviour. The bonding effect between wood and concrete was designed using notches in accordance with CEN TS 19301 and the application was accompanied by a project-related type approval.
Comparison between the visualisation in the planning and the appearance after structural implementation
The cross-laminated timber façade columns/wall pillars are designed in different widths. The load-bearing core cross-section is always b=56cm and is supplemented by ‘side wings’ of different widths. The side wings are minimally shortened on the underside in order to eliminate the load-bearing effect here.
Thanks to the CLT design, all pillar widths can be manufactured as a single component. This reduces the assembly effort, enhances the appearance of the interior (no joints) and still allows a consistent axis grid to be implemented in the structural idealisation. To ensure the R90 fire resistance duration of the CLT façade elements, a panel structure with double layers is selected (7SS). Integrated steel components at the column head guarantee a defined load transfer through the HBV slab. They are designed with a centring pin so that the upper prop can be fitted precisely over this pin. The spike also serves to absorb the horizontal loads at the prop base.
There are no visible beams in areas where the ceiling changes direction, but instead beams that are identical to the ceiling (Peikko Delta-Beam), which were subsequently clad with wood. The supporting structure and utilisation are optimally coordinated. Attention was paid to a material-appropriate construction and an attempt was made to consider the issue of deconstructability in order to create a timber hybrid building that is as exemplary as possible.
Realisation floor by floor, taking into account the installation concept, building tolerances, weather protection, etc.
via acoustic milling in board stacked ceilings with defined sound absorption coefficient, thus saving suspended ceilings or sails
Glulam ceilings, glulam beams and cross-laminated timber façade supports dimensioned using burn-off rates
Load-bearing timber ceiling + wall visible, no encapsulation
Absorber inlays, Board stack made of mineral wool
Stiff connection using cerves and reduced screw insert in accordance with CEN TS 19301
Ceiling-matching joists for HBV ceilings made of steel as a Peikko delta beam to create uniform ceiling lower edges in all areas
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