CASTING OF STAIRS • Dhameliya Urmila •Khandelwal Arti •Dhaduk Nikhilesh •Devani Chirag
CASTING OF STAIRS
• Dhameliya Urmila
•Khandelwal Arti
•Dhaduk Nikhilesh
•Devani Chirag
STAIRS
• A staircase or stairway is one or more flights of stairs leading from one floor to another, and includes landings, newel posts, handrails, balustrades and additional parts.
• Location: 14, Patel-Industrial-2, Ved Road, Surat. • Architect-ar anil patel
• It consists of risers and treads.
SITE LOCATION
• Staircase type : dog leg
• Bars : TMT bars of grade 500,dia 16mm
• Rcc construction method
• cement-grade M20
• Cement concrete Ratio-1:2:3
• Height of first riser : 0.20m
• Height of last riser : 0.10m
• Finishing material : Kota stone
Details
Process of casting a staircase Step1: Calculation
• The height of the one floor to the another is calculated. This number is the total rise to the stairs.
• Measure the horizontal distance the staircase will span.
• Measure the width of each step from left to right in the area where the staircase will go.
Step 2 : The bars extending from the slab are bent to an accurate angle and scented with the grids of flight.
Step3 : Building the plywood frame
• It is made up of steel panels in grid form (15 X 15 cm).
• The side forms are cut acc. To the tread and riser calculation.
• They must be securely adhered to the building's foundation.
6mm thk. plate
Step4: Mixing the concrete
• It can be done using Portland Cement mixer or simply
by hand.
Step5: Pouring the Concrete
• Start from the bottom and pour one step at a time.
• Once you pour it, it should be spread evenly.
• Use a spade or a rod to remove trapped air bubbles.
• Step6: Add the Finishing Touches
• A screed board is a piece of lumber somewhat longer than the width of the staircase that you'll gently work front to back and side to side to get the excess concrete off the treads.
• Size:2 by 4
After one week, frame is removed and curing is done to gain strength.
Points to consider :
• For residential building : Tread =250mm,
Riser=160mm
• For public building : Tread=300mm,
Riser=150mm
• For industrial building :
Tread=not less than 250mm,250mm to 300mm,
Riser=not less than 150mm,150mm to 190mm
Report :-
• Day1 : preparation of the frame of the staircase(approx 1-2 hours)
Day 2 : Concreting is done after the frame is ready and set(approx 3 hours)
Day 3 : left undisturbed to settle and dry
Day 4 : the frame is removed and curing is done
For coming next few days(approx 4-5 days)curing is being done to gain strength and not to dry and crack.