The document discusses lifts, including their components, types, space requirements, and design considerations. Lifts are installed in multi-storey buildings to avoid fatigue from using stairs and allow for quick vertical circulation. A lift shaft extends from below the ground floor to house equipment and buffers, and a machine room located at the top of the shaft houses additional equipment. Design considerations for lifts include quantity of service, expressed as passenger handling capacity, and quality of service, expressed as waiting time.

1. LIFT

2. lift
• For multi- storeyed buildings the installation of lifts is a
must to avoid fatigue in climbing up the stairs and for
quick vertical circulation between different floors.
• The provision of lifts in a building is a highly specialised
job.
• A vertical hat with openings at the floor level is
provided.
• The shaft is located at a suitable place e.g. by the side
of the stair or within the open well of a stiar.
• The shaft extends below the ground floor to
accomodate the spring buffers for low speed lifts and
hydraulic buffers high speed lifts.

3. • Usually a machine room (control room) is located
at the top of the left shaft for housing equipment
and accessories.
• It can be at the bottom by the side of the shaft.
• The size of the machine room is normally 4 m x 3
m x 2.5 m.
• Floors or machine room should be designed to
carry a load or not less than 500 Kg/m
• Previously collapsible doors were provided both
for the lift car (cage) and for the opening in the
shaft at the floor level.
• Now a days flush doors of sliding type are
provided.

4. Types of lift
1) Hydraulic lift
2) Electric lift
3) Passenger lift
4) Goods lift

5. Components of lift
1) Control room
2) guides
3) lift car
4) counter weight
5) control panel
6) lift pit
7) Buffer
8) Hoist way
9) hoist rope

6. Space Requirements

7. Passanger lift

8. DESIGN CONSIDERATIONS FOR LIFT
• Two important aspects in lift design are
a. Quantity of service
b. Quality of service

9. a. Quantity of service
• “Quantity of service” means passenger
handling capacity of lift.
• During peak hours, the number of
passengers which a lift can handle in 5
minutes time is taken as passenger handling
capacity (H).
• It is expressed as percentage of total number
of persons living in the building.

10. Class of occupancy H (percent)
Residential building
Office for single purpose
Office for multiple purpose
5
15 – 25
10 - 15

11. b. Quality of service
• The waiting time for lift by passengers on
different floors is expressed as quality of
service.
Quality of service
(WAITING INTERVAL)
RATING
20-25 Seconds
30-35 Seconds
35-40 Seconds
40-45 Seconds
over 45 Seconds
Excellent
Good
Fair
Poor
unsatisfactory

12. Handling capacity
H= 300 x Q x 100
T x P
Where,
H = Handling capacity for 5 minute
Q = average number of passengers
carried in car
T = waiting interval (sec.)
P = total population to be handled

13. Waiting interval
T = Rf
N
where,
T = Waiting interval (sec.)
Rf = Round trip time
N = No. of lifts

14. Occupant load :
Occupant load = gross area (m2)
person

15. Sr.
No.
occupancy Occupant load gross
area in m2 / person
1.
2.
3.
4.
5.
6.
7.
Residential
Educational
Institutional
Assembly hall with seats
Business and industrial
Storage
hazardous
12.5
4
15
0.6
10
30
10