KOCHI METRO RAIL

Geometrical design norms are based on international practices adopted for similar metro systems with standard gauge on the assumption that the maximum permissible speed on the section is limited to 80 kms.
Tracks will be carried on U-shaped elevated decking supported by single circular piers, generally spaced at 28-m centres and located on the median of the road. Horizontal alignment and vertical alignment are, therefore, dictated to a large extent by the geometry of the road followed by the alignment.
Track centre on the elevated section will be 3.7 m on portions of tracks which are straight or having curvature upto radius of 150 m. Track centre will be increased to 4 m on curves with radius sharper than 150 m.
The proposed viaduct structure for the Kochi Metro is a 'U'-shaped pre-stressed concrete deck, carrying two tracks supported on single pier located on the median of the road. Width of the deck is 9.0 m and the piers will be elliptical of 1.2 m x 1.85 m size. Road clearance of 5.5 m is ensured below the viaduct structure. The foundation shall be pile foundation at most of the locations. Open foundations are possible at certain isolated locations. The superstructure shall be pre-cast segmental construction which will cause minimal inconvenience to the road users during the execution stage.