requirements of good stair and details of eah

stairs

1. REQUIREMENTS OF
GOOD STAIR

2. REQUIREMENTS OFGOOD STAIR
LOCATION
They should be located near the main entrance in case of
public building
In case of residential buildings it should be located
centrally so that all rooms shall have easy and direct
approach to the stair
There should be spaciousapproach.
Good light and ventilation should beavailable.

3. LENGTH OF FLIGHT
The number of steps should not be more than 12 & less than 3 from
comfort point ofview
PITCH OF STAIR
Pitch should be limited to 30
o
to45
o
.
HEAD ROOM
It should be preferably be not less than 2m
HAND RAIL
When a flight consist of more than three steps, a handrail atleaston one
side is considered to be necessity
The height of hand rail above the riser should be approximately 80cm

4. WIDTHOFSTAIR
Itshouldbewideenoughtocarrytheuserwithoutmuch
crowdandinconvenience.
InResidentialbuilding,a90cmwidestairissufficient
whileinpublic1.5to1.8mwidthmayrequired.
STEPDIMENSION
The rise and going should be of such dimensions as to
provide comfort tousers.
The going should not be less than 25 cm, though 30 cm
going is quitecomfortable.
The rise should be between 10 to 15cm.
All steps should be of uniform dimensions

5. THUMB RULES FOR DIMENSIONS OF STEP
(2 ×Rise in cm) + (Going in cm) =60 cm
(Rise in cm) + (Going in cm) = 40 to45 cm
(Rise in cm) ×(Going in cm) = 400 to450 cm

6. RAMP

7. RAMP
A ramp is a sloping surface and it is adopted as a substitute
for stair for easy connection between the floors.

8. The usual slope of a ramp is 1 in 15
The flooring of ramp should be non-slippery
The shape of ramp need not be straight.Itmay be of
spiral,curveetc.
The ramps are provided at places such as garage,railway
station,stadium,officebuildings etc.

9. ESCALATOR

10. Anescalatoris a moving staircase which carries people
between floors of a building. It consists of a motor-driven chain
of individually linked steps on a track which cycle on a pair of
tracks which keep them horizontal.

11. Specification
Speed-0.46 to 0.5 m/s
Angle of inclination -30 to 35°
Escalators are arranged in pairs,onefor upward
movement and other for downward movement
They are generally used when traffic of persons is heavy
between the floors

12. LIFT

13. A vertical transport equipment that efficiently moves people
between floors of abuilding
For multi storied buildings the installation of lift is essential to
avoid difficulties in climbing up the stairs and for quick vertical
movement between the floors
There are primarily two types of lifts are there
1.Passenger lifts:Passengerlifts are provided in aparment,high
rise buildings,officesetc. to lift the passengers from floor to
floor
2.Goods lift:Theyare provided in industrial buildings to carry
materials from one floor to another floor