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UNDER THE GUIDANCE OF
ER. ALTAMASH MANSOORI
LECTURER CIVIL ENGG.
INTEGRAL UNIVERSITY LKO.
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TAIYYAB YUSUF
NIPURN KAKKAR
SYED AUSAF HASAN
EKANK TIWARI
B.TECH CIVIL 3
RD
YR (CE-2)
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SLEEPER
Sleepers are member generally laidtransverse to the rail on
which the rails aresupported and fixed ,to transfer the loadsfrom
rails to ballast and sub-grade below.
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To hold the rails to correct gauge.FUNCTIONS OF SLEEPERS:
To hold the rails in proper lever.
To distribute the load from the rails to indexarea of ballast
underlying it.
To act an elastic medium in between the ballastand rails.
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To distribute the load from the rails to index areaof ballast
underlying it
To support the rails at a proper level in straight
tracks and at proper superelevation on curves.
They also provide means to rectify track geometry during
service life.
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REQUIREMENTS OF SLEEPERS
The sleepers to be used should be economical.
The weight of sleepers should not be too
heavy.
The design of sleepers should be such thatthey are not damaged
during packing
processes.
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The design of sleepers should be such that they arenot damaged
during packing processes.
The insulation of rails should possible for track
circuiting if required though sleepers.
The sleepers should be capable of resistingshocks and
vibrations
An ideal sleeper should also have antisabotageand anti-theft
qualities.
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TYPES OF SLEEPERS
There are following types of sleeper:*Wooden sleepers
*Metal sleepers
(a)Cast iron sleepers
(b)Steel sleepers
*Concrete sleepers
(a)Reinforced concrete sleepers
(b)Pre-stressed concrete sleepers *
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WOODEN SLEEPERS
Wooden sleepers are regarded to be best as they fulfilalmost all
the requirement of an ideal sleeper .The life of
timber sleepers depends upon their ability to resist .Wear,
Decay, White ants
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DISADVANTAGES
The sleepers are subjected to wear, decay,
cracking, rail cutting etc.
Track is easily disturbed.
Wooden sleepers have got minimum service life12 to 15 years.
Maintenance cost of wooden sleeper is highest
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CONCRETE SLEEPER
They are made of a strong homogeneous materials
,impervious to effects of moisture and is unaffected
by chemical attack of atmospheric gases or sub-soil
salts.
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TYPES OF CONCRETE SLEEPERS
R i f rc c cr t sl rs
Pr -str ss c cr t sl rs
ADVANTAGESThese sleepers are free from natural decay andattacks
by vermin, insects etc.
T
hey have maximum life when compared toother sleepers.
There is no difficulty in track-circuiting.
The sleepers have higher elastic modulus.
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DISA
DVAN
TAGES
The weight of concrete sleeper is as high as 2.5 to 3
times of wooden sleepers.
These sleepers require pads and plugs for spikes.
They damage the bottom edge during the packing.
The damages to the concrete sleepers is very heavy
in case of derailment.
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THANK YOU
