The technology of the construction of a screw staircase may differ, depending on the materials used in the design. The metal staircase does not always look aesthetically aesthetically pleasing, a wooden spiral staircase is quite complicated. The best option for an independent structure is a combination of materials.
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The supporting metal pipe is installed vertically along the plumb line and securely fixed. The lower edge is concrete, the upper part is fixed to the ceiling. The frame under the step is welded in line with the drawing. Additionally, support pipes are fixed for installation of the railing, it is recommended to fix them on the floor and to the ceiling.
The steps for stairs are made of wood or terrace boards. The sizes of the sites are adjusted to the corresponding sizes of the metal frame. It is possible to build concrete steps for a spiral staircase, but for this you will need to build a formwork for each step.
The safety of the structure increases by connecting each step with the railing with a metal rod. For stairs above 3 m, additional supports are used. When calculating the steps, they should be arranged so that the layers of individual elements do not occur, but there should not be large cracks.