QUANTITY OF STAIR
QUANTITY OF STAIR
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A staircase is a compulsory part of a building that is provided to make a path between two floors.
mainly two parts of the staircase Step and Landing.
Step: A step is mostly used on the triangular-shaped part of a staircase which sits on an inclined slab mean (Waist slab). A step also has two parts: Tread and Riser.
Riser: it is the vertical portion of steps. Normally, the height of a riser is 6’’ to 8’’ inches.
Tread: tread is the horizontal portion of a step. The width of a tread is normally kept 10’’to 12’’ inches.
Landing: landing is a horizontal slab which is provided in between the two flights of a staircase.landing is mainly provided for changing the moving direction of a stair.
QUANTITY OF STAIR
PARTS OF STAIRCASE
A staircase is a compulsory part of a building that is provided to make a path between two floors.
mainly two parts of the staircase Step and Landing.
Step: A step is mostly used on the triangular-shaped part of a staircase which sits on an inclined slab mean (Waist slab). A step also has two parts: Tread and Riser.
Riser: it is the vertical portion of steps. Normally, the height of a riser is 6’’ to 8’’ inches.
Tread: tread is the horizontal portion of a step. The width of a tread is normally kept 10’’to 12’’ inches.
Landing: landing is a horizontal slab which is provided in between the two flights of a staircase.landing is mainly provided for changing the moving direction of a stair.
- 1st flight of stair Steps and waist slab
- 2nd flight of stair Steps and waist slab
- Landing.
</script>Now start to calculate the concrete volume for the staircase.
THE VOLUME OF 1ST FLIGHT OF THE STAIRCASE
From the above two images –
Riser = 6 inches
Tread = 12 inches
Length of a step = 5 feet
Number of steps = 7
The thickness of the waist slab = 6 inches
CONCRETE VOLUME FOR THE WAIST SLAB
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</script>The staircase slab means the waist of the staircase. To calculate the inclined length of the waist slab.
Do not show the Inclined length of the waist slab in the drawing. But we can calculate that from the drawing plan.
let’s calculate.
the horizontal length of a waist slab = number of steps x tread
horizontal length of a waist slab = 7 x 12’’
horizontal length of a waist slab =7’ feet ………………(1)
height of the landing top from the floor
= number of riser x-height of the riser
= 7 x 6″ [number of riser = number of steps = 1]
= 3.5’ feet.
So the inclined length of the waist slab is,
=√{(horizontal length)2 + (Height)2}
= (7’)2 + (3.5’)2
=10.5’ feet
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