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Unit 1. introduction to Railway Engineering

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This document discusses various aspects of railway engineering including ballast, sleepers, rails, points and crossings, tractive resistance, track stresses, hauling capacity, buckling due to temperature stresses, and stresses in rails, sleepers, ballast, and formation. It covers topics such as the components that make up the track, factors that influence tractive resistance and track stresses, and how stresses are distributed throughout the track components and subsurface.

Education
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RAILWAY ENGINEERING By: Lohit Havalagi Assistant professor, NKOCET Solapur
BALLAST CESS BALLAST CRIB
Ballast Crib & Ballast cess BALLAST CRIB BALLAST CESS SLEEPER RAIL
Points & Crossings
Fishplate & Fish Bolt
Level Crossing
Concrete sleeper
Cast Iron Sleeper
CONONG OF WHEELS
Coning of Wheels
Tractive Resistances 1. Train Resistance I. Speed Independent (Rolling) Resistances II. Speed Dependent Resistances III. Atmospheric Resistances 2. Resistance due to Track Profile I. Grade Resistance II. Curve resistance 3. Resistance due to Starting & accelerating 4. Wind Resistance
Track stresses
Track stresses
Track Modulus • Load Per Unit Length of the rail Required to Produce Unit Depression. • Depends Upon: 1. Gauge 2. Type of Rail section 3. Type of sleeper and density 4. Type of ballast section 5. Subgrade
Track stresses 1. Wheel loads 2. Dynamic effect of wheel loads 3. Hammer Blow 4. Lateral Thrust due to Nosing Action 5. Pressure Exerted by the flanges of the wheels on sides of rails 6. Stresses due to Irregularity of track 7. Additional stresses on curves
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)
Buckling of Track Due to Temperature stresses
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
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
• Efficiency of Fastenings • Design & Dimension of Sleeper • Strength of Sleeper • Track Modulus • Stiffness of the rail • Maintenance of track
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.
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.
Unit 1. introduction to Railway Engineering

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Unit 1. introduction to Railway Engineering

  • 1. RAILWAY ENGINEERING By: Lohit Havalagi Assistant professor, NKOCET Solapur
  • 3. Ballast Crib & Ballast cess BALLAST CRIB BALLAST CESS SLEEPER RAIL
  • 4.
  • 7.
  • 9.
  • 13.
  • 15. Tractive Resistances 1. Train Resistance I. Speed Independent (Rolling) Resistances II. Speed Dependent Resistances III. Atmospheric Resistances 2. Resistance due to Track Profile I. Grade Resistance II. Curve resistance 3. Resistance due to Starting & accelerating 4. Wind Resistance
  • 18. Track Modulus • Load Per Unit Length of the rail Required to Produce Unit Depression. • Depends Upon: 1. Gauge 2. Type of Rail section 3. Type of sleeper and density 4. Type of ballast section 5. Subgrade
  • 19. Track stresses 1. Wheel loads 2. Dynamic effect of wheel loads 3. Hammer Blow 4. Lateral Thrust due to Nosing Action 5. Pressure Exerted by the flanges of the wheels on sides of rails 6. Stresses due to Irregularity of track 7. 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.
  翻译：