STEEL SPIRAL STAIRECASE

STEEL SPIRAL STAIRCASE Name: Maryam Anaa Ahmed Student ID: 0338915 Module name: Detailing and Working Drawings Module code: IDS 60804 Lecturer's name: Ms.Norji

IMAGES OF THE STAIRECASE

MATERIALS

Steel structural frame

Walnut wood tread

CONSTRUCTION METHOD

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The skeleton of the staircase is all steel joined using wielding.

The railing is joined into the sockets shown in detail 1 and 2 in CAD drawing.

The Walnut wood tread is glued using an adhesive onto the steel tread.

UBBL STATEMENT

Tread 240mm Riser 200mm

By Law 106 - Rules on STAIRCASES • RISERS ≤180mm max & TREAD 255mm min.

By Law 109 – WINDING STAIRCASE • Spiral Stairs permitted as secondary stairs where top floor ≤12.2m or not as required means of egress

By Law 107 - Rules on HANDRAILS TO STAIRCASES • min 4Risers stairs to have handrails, • min 2225mm width stairs to have intermediate handrails spaced equally

The tread does follow the UBBL law but the riser is higher than a normal standard staircase. From my research I have found out that spiral stair cases are allowed to have a riser more than 180mm.

The upper rectangular treads are kept in 30 degrees and they have different tread size.

The railing is 3657mm long. According to all my research this staircase does not follow much of the UBBL laws. It is built in away to save space.

FIRE SAFETY

Steel is not combustible and it will not feed the fire so it is quite safe. As the spiral staircase has different tread size it is not the safest against fire.

The wood treads are combustible and will attract fire hence the overall fire safety of this staircase is quite low.