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INDIAN RAILWAY INSTITUTE OF CIVIL ENGINEERING

INDIAN RAILWAY INSTITUTE OF CIVIL ENGINEERING. PRESENTATION ON THICK WEB SWITCH Prepared by: Sri Manish Jaiswal Sri Sanjeev Pathak. Thick Web Switch. Rails of Asymmetrical Section (Zu-2-49, Zu-1-60). Web Thickness 40/44 mm. Thick Web Switch. On IR ( Non OR type)

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INDIAN RAILWAY INSTITUTE OF CIVIL ENGINEERING

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  1. INDIAN RAILWAY INSTITUTE OF CIVIL ENGINEERING PRESENTATION ON THICK WEB SWITCH Prepared by: Sri Manish Jaiswal Sri Sanjeev Pathak

  2. Thick Web Switch Rails of Asymmetrical Section (Zu-2-49, Zu-1-60) Web Thickness 40/44 mm

  3. Thick Web Switch • On IR (Non OR type) • Zu-2-49 for 52 Kg • Zu-1-60 for 60 Kg RDSO/T-7075 (1 in 16) RDSO/T-6154 (1 in 12) RDSO/T-6279 (1 in 8½ )

  4. Special features of Thick-web Switches • Elevated slide chair • Switch Entry Angle – 0° 20’ 0” • Top of Tongue Rail is at level with Stock Rail • Tip of Tongue Rail is housed in recess under head of Stock Rail • End of Tongue Rail forged to match lead rail • Relief planning of foot of Tongue Rail near heel to improve flexibility • Inside foot of SR is anchored through a leaf spring • Double Pull Arrangement using GRE-5E Point Machines / Spring Setting Device for increased clearance at JOH • Tongue Rails are Fabricated from Imported Asymmetrical Rail Section, little machining of foot of Tongue Rail

  5. Advantages of Thick-web Switches • No twist as top of Tongue Rail is in level with top of Stock Rail • Increased Lateral strength • Sturdier due to thicker web • SEA reduced for Smooth Entry • Jerk at entry reduced as tip of Tongue Rail is housed in a recess • Higher speed potential (50 kmphfor 1 in 12 layout)

  6. Thick-web Switch Technical Superiority over ORS

  7. Thick-web Switch Technical Superiority over ORS

  8. Typical Drawings Reference set • 1 in 12 60Kg/PSC Layout with CMS Crossing Turnout - RT-4218 Switch - RT-4219 Crossing - RT-4220

  9. Thick Web Switch • Limitations: • Thick Web Rails are generally imported, hence Costlier • SAIL has now developed rolling facilities for asymmetric section • Functioning of Point Machines is not satisfactory and problem of less flange way clearance at JOH becomes more acute due to higher lateral rigidity of Rails

  10. Thick-web Switches Specification for Thick Web Switches and End Forging also developed by RDSO : Switches made from asymmetric thick web rails to be machined by CNC machine for correct profile and prescribed roughness factor on all machined surfaces The minimum length of forged section with desired rail profile is 500 mm to accommodate 1 metre long fish plate and transition length of forging shall be in the range of 150 mm to 200 mm.

  11. Spring Setting Device

  12. THANK YOU…..

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