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Questions and Answers
What is the designation of the person responsible for supervising the welding process?
What is the designation of the person responsible for supervising the welding process?
- Helper Khalasi/Khalasi
- Welder Grade I/Grade II
- Process Supervisor (correct)
- Trackman
What is the purpose of including bolt hole distance in the Thermit Weld Register?
What is the purpose of including bolt hole distance in the Thermit Weld Register?
- To track the progress of the welding process
- To ensure proper alignment of the rails (correct)
- To determine the type of rail to be used
- To calculate the total cost of the project
What is the primary responsibility of the Trackman?
What is the primary responsibility of the Trackman?
- To perform duties as per workload (correct)
- To perform trimming and grinding operations
- To manage the workload of the welding team
- To assist the Welder Grade I/Grade II
What is the purpose of including the Agency code in the Thermit Weld Register?
What is the purpose of including the Agency code in the Thermit Weld Register?
What is the designation of the person responsible for performing trimming and grinding operations?
What is the designation of the person responsible for performing trimming and grinding operations?
What is the purpose of including the Portion details in the Thermit Weld Register?
What is the purpose of including the Portion details in the Thermit Weld Register?
What is the purpose of including the Date of manufacturing in the Thermit Weld Register?
What is the purpose of including the Date of manufacturing in the Thermit Weld Register?
What is the purpose of including the USFD testing in the Thermit Weld Register?
What is the purpose of including the USFD testing in the Thermit Weld Register?
What is the recommended range of values of gaps in mm for 39m panels in Zone I and II when the rail temperature is between tm - 7.5°C to tm - 2.5°C?
What is the recommended range of values of gaps in mm for 39m panels in Zone I and II when the rail temperature is between tm - 7.5°C to tm - 2.5°C?
What is the permissible value of gap in mm for 26m rolled rails in Zone III and IV when the rail temperature is between tm + 2.6°C to tm + 7.5°C?
What is the permissible value of gap in mm for 26m rolled rails in Zone III and IV when the rail temperature is between tm + 2.6°C to tm + 7.5°C?
What is the range of rail temperature during gap survey for which the permissible value of gap is 9-13 mm for 39m panels in Zone I and II?
What is the range of rail temperature during gap survey for which the permissible value of gap is 9-13 mm for 39m panels in Zone I and II?
How is the average of the measured gaps worked out?
How is the average of the measured gaps worked out?
What is the recommended range of values of gaps in mm for 26m rolled rails in Zone III and IV when the rail temperature is between tm + 7.6°C to tm + 12.5°C?
What is the recommended range of values of gaps in mm for 26m rolled rails in Zone III and IV when the rail temperature is between tm + 7.6°C to tm + 12.5°C?
What is the rail temperature range during gap survey for which the permissible value of gap is 5-9 mm for 39m panels in Zone I and II?
What is the rail temperature range during gap survey for which the permissible value of gap is 5-9 mm for 39m panels in Zone I and II?
What is the permissible value of gap in mm for 39m panels in Zone III and IV when the rail temperature is between tm - 17.5°C to tm - 12.6°C?
What is the permissible value of gap in mm for 39m panels in Zone III and IV when the rail temperature is between tm - 17.5°C to tm - 12.6°C?
What is the rail temperature range during gap survey for which the permissible value of gap is 3-7 mm for 26m rolled rails in Zone I and II?
What is the rail temperature range during gap survey for which the permissible value of gap is 3-7 mm for 26m rolled rails in Zone I and II?
What is the maximum span length for a bridge with single span and sliding bearings at both ends?
What is the maximum span length for a bridge with single span and sliding bearings at both ends?
How many anchoring arrangements are required for central sleepers in end spans?
How many anchoring arrangements are required for central sleepers in end spans?
What is the frequency of lubrication of sliding bearings?
What is the frequency of lubrication of sliding bearings?
When should the sliding bearings be inspected and cleared of foreign materials?
When should the sliding bearings be inspected and cleared of foreign materials?
How should the girders be positioned before laying LWR/CWR?
How should the girders be positioned before laying LWR/CWR?
What type of fastenings should be provided for the remaining sleepers?
What type of fastenings should be provided for the remaining sleepers?
What is the purpose of anchoring arrangements for central sleepers?
What is the purpose of anchoring arrangements for central sleepers?
What is the standard for laying and maintaining the track structure in the approaches?
What is the standard for laying and maintaining the track structure in the approaches?
What is the recommended number of packing rounds for newly laid track or freshly deep screened track?
What is the recommended number of packing rounds for newly laid track or freshly deep screened track?
What type of clamps are used with joggled fishplates?
What type of clamps are used with joggled fishplates?
What is the primary factor that resists thermal force in a Longitudinal Welded Rail (LWR)?
What is the primary factor that resists thermal force in a Longitudinal Welded Rail (LWR)?
What is the unit of longitudinal ballast resistance of sleepers?
What is the unit of longitudinal ballast resistance of sleepers?
What is the indicative density of PSC sleeper?
What is the indicative density of PSC sleeper?
What is the purpose of imposing a temporary speed restriction?
What is the purpose of imposing a temporary speed restriction?
What is a critical factor in determining the gap at SEJ?
What is a critical factor in determining the gap at SEJ?
What is the purpose of the initial gap at SEJ?
What is the purpose of the initial gap at SEJ?
What is the primary purpose of de-stressing operation of LWR?
What is the primary purpose of de-stressing operation of LWR?
What is the temperature range at which de-stressing operation is typically done?
What is the temperature range at which de-stressing operation is typically done?
What is the purpose of removing impediments to free movement of rail during de-stressing operation?
What is the purpose of removing impediments to free movement of rail during de-stressing operation?
What is the recommended duration of a traffic block during de-stressing operation?
What is the recommended duration of a traffic block during de-stressing operation?
Under whose supervision is the de-stressing operation of LWR done?
Under whose supervision is the de-stressing operation of LWR done?
What is the criterion for dividing LWR into manageable lengths for de-stressing?
What is the criterion for dividing LWR into manageable lengths for de-stressing?
What is the purpose of using rail tensors during de-stressing operation?
What is the purpose of using rail tensors during de-stressing operation?
What is the relevance of Fig 3.19 in the context of de-stressing operation of LWR?
What is the relevance of Fig 3.19 in the context of de-stressing operation of LWR?
Study Notes
Bridges with Rail-Free Fastenings
- Bridges with rail-free fastenings and partly box-anchored are allowed with single spans not exceeding 30.5 meters and having sliding bearings at both ends.
- The overall length of the bridge should not exceed the maximum provided in Table 1.
- Central sleepers shall be anchored with an anchoring arrangement, and the remaining sleepers shall be provided with rail-free fastenings.
- The track structure in the approaches shall be laid and maintained to the standards stated in the guidelines.
Welding Team Composition
- The composition of the welding team consists of:
- Welder Grade I/Grade II: 1
- Welder Grade III/Skilled Artisan: 2
- Helper Khalasi/Khalasi: 5
- Trackman: as per workload
Thermit Weld Register
- A proforma for the Thermit Weld Register is provided, which includes:
- Sl. No.
- Date of welding
- Location details
- Rail details
- Bolt hole distance (in mm)
- Portion details
- Welding details
- Agency code
- Batch number
- Manufacturing code
- Process Supervisor code
- Welder code
Recommended Range of Gaps
- The recommended range of values of gaps during service for various ranges of rail temperature is provided in Table 2.
- The table includes ranges for Zone I and II, as well as Zone III and IV.
- The gaps are measured in mm and are dependent on the rail temperature.
Calculations for Adjustment
- The average of the measured gaps is worked out as shown in the proforma for gap survey.
- For newly laid tracks, three rounds of packing are required, with the last two rounds done by on-track tamping machines.
Temporary Speed Restriction
- A temporary speed restriction is imposed on the length of track where welded panels are joined by 1m long fishplates with special screw clamps or joggled fishplates with slotted grooves and bolted clamps.
Gaps at SEJ
- The thermal force in a Long Welded Rail (LWR) is to be resisted by suitable track structure.
- The gap at SEJ depends on:
- Longitudinal Ballast Resistance of sleepers
- Area of rail section
- Modulus of Elasticity (E) for rail steel
- Coefficient of linear expansion (α) for rail steel
- Difference between the De-stressing temperature and prevailing rail temperature of LWR
- Initial gap at SEJ at de-stressing temperature
De-stressing Operation of LWR
- De-stressing shall be done during a traffic block under the personal supervision of JE/SSE/P.Way.
- De-stressing shall be done when the rail temperature falls between the range provided for t d.
- If the required temperature cannot be obtained in the field, de-stressing can be done at a little lower temperature than the targeted stress-free temperature with the use of rail tensors.
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Description
This quiz covers the specifications and design requirements for bridges with rail-free fastenings and box-anchored bridges. It includes details on overall length, anchoring arrangements, and sleeper design.
