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20.03.06 Dedicated Freight Corridor
ByCHAHATEY RAMCBE/ER
20.03.06 Dedicated Freight Corridor
CONSTRUCTION ASPECTS- GENERAL
Sectional speed to be 160 kmph
Formation and bridges to be fit for HM Loading
Ruling gradient to be 1 in 150 Curves not to be sharper than 1 degree
20.03.06 Dedicated Freight Corridor
CONSTRUCTION ASPECTS -GENERAL
Maximum moving dimensions to cater to widest future stock and double stack containers
Quality assurance to be separated from execution & to be entrusted to 3rd party – NHAI case
Speed on turnouts to be 50 kmph
20.03.06 Dedicated Freight Corridor
CONSTRUCTION ASPECTS -GENERAL
Twin single line while entering/ leaving metros
20.03.06 Dedicated Freight Corridor
CONSTRUCTION ASPECTS- TRACK
Take care of points which bother maintenance engineers
20.03.06 Dedicated Freight Corridor
CONSTRUCTION ASPECTS- TRACK
TURN OUTS Can’t eliminate them, reduce them
HOW? Only one x-over at each station Only one loop at a station, alternately on UP and DN side
20.03.06 Dedicated Freight Corridor
CONSTRUCTION ASPECTS- TRACK
LEVEL CROSSING
Eliminate them
HOW ?
Provide grade separators
20.03.06 Dedicated Freight Corridor
CONSTRUCTION ASPECTS- TRACK
SEJs
Reduce them - station to station LWRs
Improve them – Use improved design
20.03.06 Dedicated Freight Corridor
CONSTRUCTION ASPECTS- TRACK
GLUED JOINTS
Eliminate them
HOW?
Jointless track circuit
20.03.06 Dedicated Freight Corridor
CONSTRUCTION ASPECTS- TRACK
WEAK FORMATION Good quality construction, follow
RDSO guidelines for earthwork Emulate NHAI example Take safety measures against
boulders falling & slope failures in high cuttings-adequate cess width, 1:1 slope, pucca drains
20.03.06 Dedicated Freight Corridor
CONSTRUCTION ASPECTS- TRACK
BALLAST DEFICIENCY
Fully automated mega ballast depot to cater to the whole corridor, Rly to obtain lease, ballast contract for long period say 10 years with customised PVC
20.03.06 Dedicated Freight Corridor
CONSTRUCTION ASPECTS- TRACK
FREQUENT RENEWAL OF FITTINGS Have fittings of such design & quality so that uniform life of track (sleeper & fittings) can be achieved- only complete track renewal should be required
20.03.06 Dedicated Freight Corridor
CONSTRUCTION ASPECTS - BRIDGES
Training- Every person (Rly & contractor) in assigned job
Design theme to be the least LCC , ease of maintenance & not the initial cost
All bridges to have ballasted decks
20.03.06 Dedicated Freight Corridor
CONSTRUCTION ASPECTS (BRIDGES)
ROBs to be bearingless (framed structures)
Use continuous spans and fully welded girders for economy in capital as well as maintenance cost
20.03.06 Dedicated Freight Corridor
CONSTRUCTION ASPECTS (BRIDGES)
Use large span in perennial rivers to avoid/ reduce UWI of piers
Use strip seal expansion joints at ROBs wherever unavoidable
Provide inbuilt remote condition monitoring of bridges during construction itself
20.03.06 Dedicated Freight Corridor
CONSTRUCTION ASPECTS (BRIDGES)
Steel girders – corten steel, metallising for enhanced durability
20.03.06 Dedicated Freight Corridor
CONSTRUCTION ASPECTS (BRIDGES)
Design to cater for inspection, monitoring and maintenance How to measure camber in PSC girders of large spans
Lifting points of jacks for release/ replacement of bearings
20.03.06 Dedicated Freight Corridor
CONSTRUCTION ASPECTS (BRIDGES)
Working area & access at piers
Inspection of PSC box girders from inside
How to inspect very tall piers
20.03.06 Dedicated Freight Corridor
CONSTRUCTION ASPECTS (BRIDGES)
Concrete bridges
High performance concrete (HPC)
Self compacting concrete (SCC)
20.03.06 Dedicated Freight Corridor
CONSTRUCTION ASPECTS (BRIDGES)
Use of concrete pump & batching plant to be made compulsory even for minor bridges for enhanced durability
Protective coating to all concrete surfaces
20.03.06 Dedicated Freight Corridor
MAINTENANCE PRACTICES - TRACK
Decide maintenance system, organisation, dedicated fixed time corridor blocks; wokshop, track machines,conveyance & communication for P. Way engineers
20.03.06 Dedicated Freight Corridor
MAINTENANCE PRACTICES - TRACK
Maintenance to be outsourced for long term say 10 to 15 years
20.03.06 Dedicated Freight Corridor
MAINTENANCE PRACTICES - TRACK
USFD TESTING
Use high speed SPURT car capable of recording at 70 kmph
EMAT technique to be used
20.03.06 Dedicated Freight Corridor
MAINTENANCE PRACTICES - BRIDGE
Separate organisation for inspection in view of high level of expertise required- inhouse or outsourced
Separate organisation for repairs and strengthening- to be outsourced for 10 to 15 years
20.03.06 Dedicated Freight Corridor
MAINTENANCE PRACTICES - BRIDGE
Rail inspection vehicle a must Detailed Inspection and Repairs
Manual to be provided by construction agency
Have disaster management of bridges in place right at the end of construction
Release at least 5% elastomeric bearings every year
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