What is a spiral staircase? It is usually an addition to the march main ladder. The steps walking in a circle are installed on the central rack. The width of the steps increases from the rack to the outer finch. For a spiral staircase, it is not necessarily attaching it to the carrier wall. It can be installed anywhere, because one end is attached to the floor, and the second – to the ceiling or upper overlap. In addition, a spiral staircase will take twice the smaller area than the usual.
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The bearing base of the spiral staircase is usually a metal thick -walled pipe standing strictly vertically. It must be very firmly attached to the floor, because it carries a load from the mass of the entire stairs and the people located on it. The rack must either be attached with anchor bolts, or concrete. For external screw stairs, steps are made of corrugated steel, marble, tiles. Inside the rooms for steps take wood of strong wood species – oak, beech, maple). The thickness of the boards should be at least 40-50 mm. The boards are overlapped, between them the brackets are installed for reliability. A hole for installing the railing is drilled at a wide end of each step. The steps of the screw staircase unfold fan -shaped and evenly occupy a place around the circle. The direction is usually set clockwise. It is very important to properly place the first and last steps.
At the next stage of the work, you need to fix the support brackets on the wide parts of the steps. Then – install racks of the railing of the stairs. They can be curved or consisting of rectangular bars.
