This steel staircase in the foyer of KSK bank in Boppard (near Koblenz) is definitely the focus of attention. The steel staircase is characterised by an attractive harmony of steel and wood in combination with elements of stainless steel. The well-balanced selection of materials is as convincing as the modern design of this steel staircase. The parapet-high outer and inner steel stringers are curved in line with the ground plan. The stairs are perfectly set in scene on a foot landing with stainless steel frame.
Construction of the steel stairs
Consists of flat-steel stringers with steel treads welded between the stringers
The stringer thickness is 12 mm; the stringer height amounts to 1,350 mm
The inner handrail of the steel staircase consists of a round stainless steel tube with a diameter of 42 mm
The handrail brackets are manufactured from 12 mm-thick, angled round stainless steel bars
The steel staircase is fastened to the unfinished floor by steel base plates. Wall-mounted supports were added where structurally required
Design and construction in accordance with DIN 18065
Evenly rounded stairs' ground plan with an inner diameter of approximately 500 mm and an outer diameter of 2,500 mm
This provides for a generous flight width of 1,000 mm for the steel staircase
There are 19 risers up to the stair head landing, which is four times as big as one tread
Tread structure for steel staircase
Angular steel sheet frames with a thickness of 5 mm and a width of 4 cm, front and rear sides bent down
This tread structure is suitable for wood as well as glass or stone covers (marble or granite)
Two-step foot landing with a central stainless steel plate
Consists of a flat, circumferential stainless steel frame with a landing diameter of 2,600 mm
Landing consists of a frame structure with steel plate stiffeners
Ceiling frame for steel staircase structures
Circular frame layout
Suitable to mask the edge of the opening in the ceiling and provide a connection to the flooring and the ceiling structure
Flat-steel frame with a thickness of 6 mm and a height of 300 mm, with welded-on flat-steel fishplates for fastening to the unfinished floor
Frame projects slightly at the bottom and top over the ceiling and finished floor surfaces
All steel parts of the steel staircase are made of laser-cut St37-2, only scale-free, bright material was used; all stainless steel parts are made of material no. 1.4301.
Due to the use of steel and stainless steel, we were required to provide qualification certificates for the welding of stainless steel and steel/stainless steel connections.