lift
TRANSCRIPT
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LIFT
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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.
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• 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.
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Types of lift
1) Hydraulic lift
2) Electric lift
3) Passenger lift
4) Goods lift
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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
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Space Requirements
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Passanger lift
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DESIGN CONSIDERATIONS FOR LIFT
• Two important aspects in lift design are
a. Quantity of service
b. Quality of service
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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.
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Class of occupancy H (percent)
Residential building
Office for single purpose
Office for multiple purpose
5
15 – 25
10 - 15
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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
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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
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Waiting interval
T = Rf
N
where,
T = Waiting interval (sec.)
Rf = Round trip time
N = No. of lifts
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Occupant load :
Occupant load = gross area (m2)
person
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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
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