| 摘要 |
A simple spiral stair, in particular outside stair, is described, the individual steps of which are constructed as prefabricated steps. For the construction of the steps, two embodiments are proposed. In the first embodiment of a step, the tread plate and the riser plate are designed in separate parts; in the second embodiment of a step, the tread plate and the riser plate form one part. The material of the steps is concrete with an inner reinforcement. In both embodiments, the steps, assembled as a simple spiral stair, can overlap one another to a greater or lesser extent, so that a long or short winding can be produced using the same prefabricated steps. Rectangular steps which are known in their outward form, but are constructed in accordance with one of the embodiments according to the invention form the first step and the last step of the winding. <IMAGE> |
