Galerie Winx-Tower Frankfurt

Spiral staircase featuring glass railing

Amazing spiral staircase

The elegant spiral staircase in the WINX Tower attracts attention with the harmonious interplay of balustrade stringers and glass railings.

Project description

Exclusive stairs in the WINX Tower

“WINX. The Riverside Tower” in Frankfurt/Main is a 110 m high building over 28 storeys, located on the border of the banking district. With its butterfly-shaped and modern architecture, the office tower makes its mark on the skyline and becomes a unique specimen among the city’s skyscrapers. The WINX Tower is designed down to the smallest detail and built with resource efficiency in mind. As proof of this quality, the building received the DGNB platinum certificate.

Susanne Klatten, Germany’s richest woman, acquired the entire building even before its completion in 2019. Many office spaces have been occupied in the meantime. In 2020, the global law firm DLA Piper moved into their new premises on floors 23 to 27 and the roof terrace on the 28th floor of the building. For this renowned law firm, we were commissioned to produce two exclusive staircases.

Spiral staircase with glass railing

From floor 26 to 28, an elegant spiral staircase with a parapet railing on the inner stringer and a timeless all-glass railing on the outer stringer is highly convincing. The centre of the stringers is offset to change the running width. A filigree stainless steel U-profile serves as edge protection. Not at least because of the structurally supporting soffit cladding, the spiral staircase gets its sculptural character.
The assembly was really spectacular: already in Salach, our employees divided both staircases into transportable segments, which were placed in the upper floors on the construction site by means of a rotating tower crane. To transport the individual components within the tower, a mini crane was used.

Winx-Tower Frankfurt
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Project details

Floor plan spiral staircase

  • 1 stair flight, evenly rounded
  • diameter of the inner stringer approx. 900 mm
  • flight width approx 1,000-1,350 mm
  • 20 risers, 19 steps on storey 26 -27
  • 23 risers, 22 steps on storeys 27 – 28, between stairs foot and head

Inner fall-preventing balustrade stringer

  • stringer thickness up to 20 mm
  • stringer height up to 1020 mm

Outer box-type stringer with glass pocket

  • stringer thickness up to 20 mm
  • stringer width up to 80 mm
  • stringer height up to 400 mm

Structurally supporting soffit cladding

  • smooth steel surface
  • exactly shaped according the stairs design
  • welded in between the stringers on the bottom side
  • no visible joints, tolerance adjustments etc.
  • structurally supporting element resulting in improved statics and advantages for the vibration behaviour of the spiral staircase

All-glass railing for spiral staircase

  • design according to structural requirements and on the basis of AbP (general test certificate of the German building authorities)
  • laminated safety glass panes, thickness approx. 16-20 mm
  • length of the panes up to 2,000 mm
  • vertical glass joints approx. 10-20 mm
  • railing height approx. 1,020 mm
  • all-glass railing evenly rounded, ascending
  • stainless steel U-section for handrail, approx. 30×30 mm

On the 27th floor, the all-glass railing continues along the ceiling edge analogous to the spiral staircase.

Further MetallArt services

On floors 23-27, a stylish steel staircase with evenly rounded and straight sections connects the floors with each other. A paling balustrade with a handrail made of oiled American walnut finishes the construction.

In addition to the services listed, MetallArt was responsible for the verifiable structural analyses of the stairs, the paling balustrade and the all-glass railing for the spiral staircase.

Architectural practice:

CSMM GmbH, Munich