20.03.06dedicated freight corridor by chahatey ram cbe/er

20.03.06 Dedicated Freight Corridor

ByCHAHATEY RAMCBE/ER


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


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


CONSTRUCTION ASPECTS -GENERAL

Twin single line while entering/ leaving metros


CONSTRUCTION ASPECTS- TRACK

Take care of points which bother maintenance engineers



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



LEVEL CROSSING

Eliminate them

HOW ?

Provide grade separators



SEJs

Reduce them - station to station LWRs

Improve them – Use improved design



GLUED JOINTS

Eliminate them

HOW?

Jointless track circuit



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



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



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


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


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



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



Steel girders – corten steel, metallising for enhanced durability



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



Working area & access at piers

Inspection of PSC box girders from inside

How to inspect very tall piers



Concrete bridges

High performance concrete (HPC)

Self compacting concrete (SCC)



Use of concrete pump & batching plant to be made compulsory even for minor bridges for enhanced durability

Protective coating to all concrete surfaces


MAINTENANCE PRACTICES - TRACK

Decide maintenance system, organisation, dedicated fixed time corridor blocks; wokshop, track machines,conveyance & communication for P. Way engineers



Maintenance to be outsourced for long term say 10 to 15 years



USFD TESTING

Use high speed SPURT car capable of recording at 70 kmph

EMAT technique to be used


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


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

20.03.06dedicated freight corridor by chahatey ram cbe/er

Documents

minor bridges

track machines

psc girders of large

welded girders

ease of maintenance

initial costall bridges

complete track renewal

design quality