Steel stairs with balustrade stringers

Expressive design

In the centre of the ultra modern office block, the steel stairs winding up in a three-centred ellipse are a real eye-catcher.

Project description

WTZ III in Heilbronn

On 30 July 2015, the Centre for Science and Technology WTZ III was officially opened in the presence of representatives from science, politics and economy in the business development area “Zukunftspark Wohlgelegen” in Heilbronn. The smooth-faced underside soffit shaped to match the steel stairs run and the balustrade stringers constitute additional impressive features.

Balustrade stringers for steel stairs

The experts from MetallArt constructed the balustrade stringers for the steel stairs from welded rectangular H-shaped profiles which were fastened at the top and bottom to the load-bearing concrete stairs in a force-closed manner. The stringers have a thickness between 8 and 12 mm and are approximately 1,430 mm high. The steel steps and landing structures were welded between the stringers.

Smooth-faced steel underside soffit for steel stairs

The smooth-faced steel underside soffit is the most fashionable element in modern stairs architecture. In this project, such a soffit was also realised by shaping steel plates to match the spiralled stairs ground projection and fixing them to the underside of the steel stairs.

WTZ III Treppe
Project details

Handrails made of stainless steel

Curved stainless steel tube profiles were welded to the inner sides of the balustrade stringers and serve as handrails. Another eye-catcher is the cornice lighting as a stylish element of design. It was realised with LEDs installed by the customer.

We prepared the verifiable structural analysis for the steel stairs system and the vibration-resistance calculation. The stairs structure complies with the requirements stipulated by DIN 18065.

The Centre for Science and Technology was funded by the European Union (funds for regional development) and the state Baden-Württemberg.


Project manager

Johannes Dobnig, Dipl. Ing. Architekt