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Delhi Metro Phase 3

Delhi Metro Phase 3

The Delhi Metro is the largest and busiest rapid transit system in India, serving Delhi and its satellite cities of Ghaziabad, Faridabad, Gurgaon, Noida, Bahadurgarh and Ballabhgarh. It operates over 2,700 trips daily.

The system currently consists of 10 color-coded lines passing 253 stations with a total length of 348 km, including a mix of underground, at-grade, and elevated stations.

The development of the network was divided into phases. Phase 1 and Phase 2 were completed by 2006 and 2011, respectively. Phase 3 has 35 underground stations and 3 new lines, totaling 167 km, and is scheduled to be mostly completed by the end of 2020.

The total length of the underground corridors in Phase 3 is 54 km, more than 20 km longer than the total underground sections in Phases 1 and 2 combined, making it one of the most challenging construction phases.

More than 20 tunnel boring machines were used simultaneously to expedite the tunnel work through 10 Dextra soft-eyes installed in diaphragm walls. Thanks to the cuttable nature of GFRP (glass fiber reinforced polymer) bars, TBMs can get in or out of shafts/stations in few minutes.

Furthermore, 450 sets of active anchors were applied to retain walls during the excavation work. The anchors are also made of GFRP, hence the tendons can be excavated by any standard equipment, and no anchor removal is required.

Moreover, around 2.3 million Bartec couplers were installed to connect rebars in various parts of the concrete structures of the stations. Bartec is a bar-break performance system, designed to withstand an ultimate tensile performance of up to 800 MPa.

2,800 sets of Shear Key post-tensioning systems were also inserted into the concrete reservation as a permanent seismic restrainer for the connection of the elevated metro segments.

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.

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