The spiral staircase represents a special case among all the forms of circular stairs and requires the least space. Its main characteristic is the load-bearing column in the centre. Spiral staircases are often only mentioned as an aside in standard literature as there are no concrete provisions that regulate them. Because of the special form of the steps we need to differentiate in principle between the clear tread width (distance between the central column and the inside edge of the banister hand rail) and the usable tread width (from 100 mm run, see DIN 18065) in spiral staircases. Another special characteristic of spiral staircases is the shifting of the walking area from the centre to the outside at approx. 0.5 – 0.7 of the staircase radius. The smallest outer diameter of a staircase should not be less than 1,300 mm as this only allows severely limited use. A usable tread width of 1,000 mm can be achieved with an external diameter or approx. 2,900 mm. The standard spiral staircase currently produced by MEISER has a central column with a corresponding step sleeve column. This means that we are in a position to realise a wide range of versions and customer requirements. In the basic form, four column pairs are used which can be selected according to the diameter and height of the staircase and in line with static requirements. In order to avoid sleeve movement between the individual sleeves in our ‘push-fit system’ we also offer steel spacer rings as turned parts. Another possibility is a column that is split by storey with welded plates to screw on the individual steps. Step connections are achieved using a pipe sleeve and a special screw.
Технические характеристики
CharacteristicsTypespiralMaterialmetalOther characteristicsfirefighting
