43143 Ramp landings Landings shall be located at the top and bottom of ramps

43143 ramp landings landings shall be located at the

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4.3.14.3 Ramp landings Landings shall be located at the top and bottom of ramps and at every change of direction. The minimum dimension in the direction of travel shall be 1.0 m. Where a door opens unto a ramp, the landing shall be at least 1.5 m long in the direction of travel through the door. Figure 4-26 illustrates different types of ramps with landings.
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PCTTS 599: 20XX 50 4.3.15 Stairways 4.3.15.1 Width Stairways shall have a minimum width o f 1.0 m and a minimum clear width of 0.9 m. 4.3.15.2 Treads and risers The dimensions of risers and treads shall conform to the following formula: 600 mm < (Tread + 2 Risers) < 640 mm. The maximum riser height shall be 200 mm and the minimum tread depth shall b e 250 mm. The riser height shall be measured vertically between leading edges of the adjacent treads. The tread depth shall be measured horizontally between the vertical planes of the foremost projection of adjacent treads and at a right angle to the tre ad’s leading edge. Risers shall be vertical or sloped from the underside of the leading edge of the tread above at an angle not more than 30 degrees from the vertical. Open risers may be used, provided that the opening between treads is not greater than 100 mm. The greatest riser height within any flight of stairs shall not exceed the smallest by more than 5 mm. The greatest tread depth within any flight of stairs shall not exceed the smallest by more than 10 mm. The walking surface of treads and landings of a stairway shall have a non-skid surface and be sloped no steeper than 2 percent. The radius of curvature at the leading edge of the tread shall be no greater than 10 mm. When nosing is provided, it shall be not less that 20 mm but not more than 32 mm on stairways with solid risers. Bevelling of nosing shall not exceed 10 mm. Figure 4-27 illustrates details of treads, risers and nosings. 4.3.15.3 Headroom The minimum headroom on all parts of the stairway shall not be less than 2.0 m measured vertically from the sloped plane adjoining the tread nosing or 2.15 m from the floor surface of the landing; see Figure 4-25 for details. 4.3.15.4 Winders Winders may be used, provided that the depth of the tread at a point 500 mm from the side where the treads are narrower is at least equal to the depth of tread of the other section. Handrails on winding stairways shall be located on the side where the tread is narrower. 4.3.15.5 Spiral stairs Spiral stairways may be used, provided the minimum width is 700 mm with each tread having a 200 mm minimum tread depth at 350mm from the narrow edge. All treads shall be identical, and the rise shall be no more than 240 mm. Minimum headroom of 2.00 m shall be provided throughout. NOTE Spiral stairs are not to be considered as fire escapes.
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PCTTS 599: 20XX 51 4.3.15.6 Curved stairways Curved stairways shall have a 300 mm minimum tread depth at a point not more than 350mm from the side where the treads are narrower and the minimum tread depth at any point shall not be less than 150 mm. Tread depth at any walking line , measured a consistent distance from a side of the stairway, shall be uniform.
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