Railway Engineering - PowerPoint PPT Presentation

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Railway Engineering

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Track structure, Terminologies & Components of Railway Track Train resistances Hauling Capacity & Tractive Effort – PowerPoint PPT presentation

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Title: Railway Engineering


1
RAILWAY ENGINEERING
  • By Lohit A Havalagi
  • Assistant Professor, NKOCET Solapur
  • India

2
BALLAST CRIB
BALLAST CESS
3
Ballast Crib Ballast cess
BALLAST CESS
RAIL
BALLAST CRIB
SLEEPER
4
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5
Fishplate Fish Bolt
6
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7
Level Crossing
8
Points Crossings
9
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10
Concrete sleeper

11
Cast Iron Sleeper
12
CONONG OF WHEELS
13
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14
Coning of Wheels
15
Tractive Resistances
  • Train Resistance
  • Speed Independent (Rolling) Resistances
  • Speed Dependent Resistances
  • Atmospheric Resistances
  • Resistance due to Track Profile
  • Grade Resistance
  • Curve resistance
  • Resistance due to Starting accelerating
  • Wind Resistance

16
Track stresses
17
Track stresses
18
Track Modulus
  • Load Per Unit Length of the rail Required to
    Produce Unit Depression.
  • Depends Upon
  • Gauge
  • Type of Rail section
  • Type of sleeper and density
  • Type of ballast section
  • Subgrade

19
Track stresses
  • Wheel loads
  • Dynamic effect of wheel loads
  • Hammer Blow
  • Lateral Thrust due to Nosing Action
  • Pressure Exerted by the flanges of the wheels on
    sides of rails
  • Stresses due to Irregularity of track
  • Additional stresses on curves

20
Hauling Capacity (H.C) Tractive Effort (Te)
  • Load handled by the locomotive
  • H.C is the Product of Coefficient of friction
    Weight on the driving wheels.
  • Average value of Coefficient of friction (1/6)

21

22
Buckling of Track Due to Temperature stresses
23
Stresses in Rail
  • Longitudinal Stresses due to Tractive Effort
    Braking Forces.
  • Thermal stresses
  • Due irregularity there will be heavy impact on
    the rails.
  • Minimum Ultimate Tensile Strength of Rail 72.42
    kg/cm2

24
Stresses in the Sleepers
  • Stresses in sleepers depends upon
  • Wheel load
  • Irregularities in the track
  • Speed
  • Dynamic effect of wheels on rails
  • Elasticity of the rail

25
  • Efficiency of Fastenings
  • Design Dimension of Sleeper
  • Strength of Sleeper
  • Track Modulus
  • Stiffness of the rail
  • Maintenance of track

26
Stresses in the Ballast
  • Stresses in Ballast depends on
  • Elastic Property of the sleeper
  • Degree of compaction
  • Nature of Ballast bed
  • Bigger the cess size of sleeper, lesser the
    Pressure in ballast formation.

27
Stresses in the Formation
  • Stresses in subgrade is decreased by increasing
    both depth Size of the Ballast.
  • Quality Gradation of Ballast influences
    ultimate pressure on formation.

28
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