Bitzer Sindelfingen Treppe

Sculptural staircases in rounded design

Self-supporting sculptural staircases

The seven identical sculptural staircases create fascinating accents in the new headquarters of the global player BITZER in Sindelfingen.

Project description

Tradition meets modernity

The innovative company BITZER in Sindelfingen had two important occasions to celebrate in September 2019. In addition to its 85th anniversary, the specialist for refrigeration and air conditioning technology held the opening of its new headquarters at the traditional Sindelfingen site.

Reaching 75 metres, the openly designed, 17-storey tower is the tallest building in this Swabian region. Up to 500 modern and communicatively arranged workplaces are spread over approx. 20,000 sqm. The lower two-storey base building accommodates the reception and meeting rooms, a staff restaurant and the BITZER showroom – an extensive exhibition area on the history and today of the corporate group.

Self-supporting sculptural staircases

Designed to aesthetic perfection, the seven self-supporting sculptural staircases of identical construction represent the traditional and also innovative character of the new headquarters. The sculptural staircases complement the meeting zones on the various floors of the high-rise building and are also visible from the outside as a prominent eye-catcher. The balustrade stringer stairs in elegant white were installed in the shell of the building in one piece over the open roof. According to the construction stages, the individual staircases were lifted into the building with the help of a construction crane and subsequently aligned by the MetallArt experts and installed with the most sophisticated assembly technology.

Treppe Bitzer Sindelfingen
Project details
Sculptural staircases featuring parapet-high stringers
  • 2 flights of spiralled, evenly rounded stringer stairs
  • Parapet-high flat-steel stringers on both sides to prevent falls
  • Steel treads in folded design welded in between the stringers
  • Effective flight width of the sculptural staircases approx. 990mm
  • 22 steps, 24 risers
  • Stringer height up to approx. 1,370mm, tread concealing on the bottom
  • 1 intermediate landing and 1 exit landing each, design analogous to the tread step construction
Angular steel handrail of the sculptural staircases
  • Realised in a welded construction for the sculptural staircases
  • On the upper side, a flat-steel handrail was welded at right angles to the balustrade stringer, to which a vertical flat steel is connected at the end
  • Handrail width approx. 50 mm
  • On both sides of the sculptural staircases, ascending and horizontal respectively
Steel soffit cladding for homogeneous appearance
  • Structurally supporting smooth soffit cladding made of sheet steel
  • Precisely shaped steel sheets were welded flush between the stringers on the underside to follow the run of the staircases
  • Significantly improved statics and optimised vibration behaviour of the sculptural staircases
  • Smooth steel surface for a homogeneous appearance
Frequency specification for sculptural staircases
  • Stringer thickness, tread construction and all steel parts of the staircases were designed on the basis of a self-frequency of >/= 4.82 Hz.
Additional services

In addition to the delivery and installation of the sculptural staircases, MetallArt was also responsible for the calculation and preparation of the verifiable structural analysis of the staircases and balustrades as well as for the additional vibration verifications.


kadawittfeldarchitektur, Aachen