Project Description

Project description

Daimler Benz in Stuttgart/Sindelfingen

The flamboyant structure of the steel stairs presents itself like a sculpture in the foyer of the customer center at the Mercedes Benz factory in Stuttgart/Sindelfingen. The glass railing which is inserted in the box-type stringers juts out freely from the bearing structure and conveys the impression of transparency and elegance.

Modern steel stairs with glass railings

  • Steel stairs ground plan: single-flight, evenly rounded
  • 24 risers, 22 treads, foot landing with straight steel bridge
  • Stair width between the box-type stringers: 1,700 mm
  • Effective flight width of the steel stairs: 1,440 mm
  • Stair stringers made of welded rectangular section steel
    Stringer thickness of 12 and 15 mm in accordance with the structural analysis
    Stringer width of 150 mm
    Stringer height of 410 mm
Holzhandlauf unseerer Metalltreppe
Project details

Stair tread construction for steel stairs

  • Folded steps (TS2000) made of 8 mm-thick steel sheet, bent at the front and welded at the rear, closed tread/riser structure (folded)
  • Suitable as substructure for the wooden cover as
    tread and riser construction

Underside soffit lining

  • Made of steel sheet shaped accordingly and welded into the spiralled rising stair flight.

Substructure for the stairs’ foot landing

  • Segmental arch shape, inner radius of 650 mm, outer radius of 2,950 mm
  • Consisting of a four-sided L-frame, 8 to 10 mm thick, with steel sheet step on the top side to accommodate the landing cover
  • Frame height up to 230 mm
  • With welded-on steel fishplates for fastening to the unfinished floor
  • Tread of 5 to 6 mm-thick steel sheet with stiffeners on the underside, suitable for a multi-piece wooden covering

Inner railing with wooden handrail

  • Top chord and posts of flat steel 50/15 mm welded together to form U-shaped baluster spans
  • Handrail support as continuous flat steel chord 50/8 mm
  • Handrail bracket made of 8 mm-thick steel sheet, fastened to the railing posts

Outer railing as glass balustrade

  • With clamping structure to hold the glass balustrade, welded to the side of the box-type stringers of the steel stairs or the bridge
  • Balustrade filling on both sides made of 20 mm-thick laminated safety glass panes, regularly curved in accordance with the stair flight, cast in the U-pocket of the clamping structure and sealed (dispenses with screw connections, thereby more attractive)

For the Stuttgart/Sindelfingen project, we performed the following work and services in addition to the delivery and assembly of the complete steel stairs:

  • CAD construction drawings and detail drawings
  • Individual approval of the curved glass railing


Kohlbecker Gesamtplan GmbH, Gaggenau