Swift progress on Chennai’s double-decker metro corridor


Despite initial delays, the construction of Corridor 4 for Chennai’s double-decker Metro is now advancing rapidly. Managed by Chennai Metro Rail Limited (CMRL) in collaboration with L&T, this project is notable for being India’s first double-decker Metro, with both lines supported on the same pier.

Project Highlights:

Stations and Structure:
The 5 km stretch will include four stations: Alwarthirunagar, Valasaravakkam, Karambakkam, and Alapakkam.
Each station is being developed at two levels, featuring a common concourse and island platforms.

Construction Progress:
99% of the piling work and 78% of the pile cap work have been completed.
The 3.75 km elevated corridor merges with Corridor 5 at pier 110 and de-merges at pier 242, showcasing impressive construction speed despite design and space challenges.
Launching girders (LG) were used to erect U-girders due to space constraints, successfully completing 13 spans. Currently, 27 spans on both levels of the double-decker corridor are ready for U-girder installation.

Station-Specific Developments:

Alapakkam: Installation of 11 piers is complete.
Karambakkam: Concourse level piers have been completed.
Valasaravakkam and Alwarthirunagar: Ongoing pier work continues.
General Station Work: Entry and exit constructions, including underground sump-and-pump rooms, are progressing well at all stations.
This double-decker Metro project is poised to set a new standard in urban transportation infrastructure, providing a significant boost to Chennai’s public transit capabilities.