Beton-Tegl A/S has produced a special sprial staircase in CRC for one of the office buildings on Tuborg Boulevard in Copenhagen. The staircase is designed by the architects Arkitema and is centrally located in the atrium of the building. The staircase has an outer diameter of 6 meters. The inner handrail also acts as a spiral beam and the steps are cantilevered 2250 mm from this beam, which has to take a fair amount of torsion. The spiral beam has a thickness of 150 mm and a height of 1500 mm.
For the staircase to appear as slender and elegant as possible the steps have a thickness of 30 mm towards the atrium and this thickness increases to 100 at the root - against the handrail.
The staircase has been precast in 16 repeating elements - 4 for each floor - and is joined on site by CRC JointCast.
The staircase has been painted with a white concrete paint and the steps are covered in hard wood timber.
