Dextra Group | Reliable Connections

Close this search box.
My Dextra
Close this search box.

Chennai Metro

Chennai Metro

Chennai Metro is a urban transport system in the city of Chennai, large fast developing city in the South of India. The system comprises 4 lines, part underground and part elevated, and a total of 42 stations. Construction started in 2009 with the first line opening to the public in 2015. Total length of the system planned exceeds 45.1km.

Underground stations For this large construction project, Dextra has been involved between 2011 and 2015 in the design, engineering and supply of 61 FRP Soft Eyes for stations entry/exit points as well as TBM insertion/extraction shafts.

Thanks to the properties of FRP material, Tunnel Boring Machines cut through the D-Wall in a minimum time, saving time on schedule and ensuring the perfect condition of the TBM’s head.

Elevated segments As a complement to Soft-Eyes for underground parts of the lines, Dextra also supplied Post-Tensioning Bar Systems for permanent applications.

The PT systems are connecting piles and precast segments of the elevated viaduct (shear key and hold-down applications). Each bar system, composed of high tensile performance bars, plates and nuts, is post-tensioned to provide seismic resistance.

For each of the 1,000 sets used on Chennai metro, Dextra also supplied the corrosion accessories necessary for this type of permanent applications.

D-Walls Finally, 350,000
Bartec couplers were also used vertically and horizontally in the station D-Walls.

Horizontal connections are performed with couplers left pending. Reconnection is done one the station is excavated, with second phase rebar being reconnected to start the slabs.

Related Solutions


At every moment of your customer journey, Dextra teams dedicate themselves to the production of smart construction solutions that allow our customers to reach higher productivity and safety levels on their construction sites.

Dextra holds physical stocks on several continents, complemented in each country by the local inventories of our distributors. With this extended network, Dextra makes sure our products are always at reach no matter where our partners are.

For solutions that require to be customized, Dextra can also go beyond our standard delivery times and offer accelerated delivery schemes. Consult us for more information.

From 3 major industrial sites located in Bangkok (Thailand), Guangzhou (China), and Pune (India), Dextra completely owns its manufacturing facilities and processes. This allows us to have complete control over the timing of our operations and the quality of the solutions produced.

An independently accredited material testing laboratory, accredited to ISO-IEC17025, is located at Dextra’s main Bangkok factory, allowing the testing of material and products.

Dextra aims to supply products that exceed the most demanding international technical approvals and it is our goal to create maximum customer satisfaction by complying with our clients’ needs and specified requirements.

Please enter your information

Contact us

   Share your information with us and we’ll get back to you as soon as possible.