Chennai Metro: TBM Adyar Breaks Through
26 Feb 2025
2 Min Read
CW Team
Larsen & Toubro鈥檚 (L&T) tunnel boring machine (TBM) Adyar (S-1326A) has achieved its first breakthrough at Adyar Junction for Package TU-02 on Chennai Metro Phase 2鈥檚 Line 3. This milestone marks the fourth breakthrough in the 12 km tunnel stretch between Kellys and Taramani Road Junction stations.
The 116.1 km Phase 2 project aims to improve connectivity across Chennai, with Line 3 spanning 45.8 km and 49 stations鈥�20 elevated and 29 underground.
A Key Milestone for Chennai Metro
TBM Adyar, a 100m-long Herrenknecht earth pressure balance (EPB) machine, began its assignment at Greenways Road Station in April 2023. Over 22 months, it navigated complex geological conditions, including constructing a 300m tunnel under the Adyar River, before breaking through at Adyar Junction.
L&T has deployed eight TBMs for twin tunnel construction under Package TU-02, which involves building 24 km of tunnels.
Project Background & Scope
L&T secured Package TU-02 from Chennai Metro Rail Ltd. (CMRL) in May 2021 for Rs. 23.85 billion ($286 million), with a 42-month deadline. The contract covers:
Twin tunnel construction between Kellys and Taramani Road Junction
Diaphragm walls and entry/exit structures for Chetpet, Royapettah Government Hospital, and Thiruvanmiyur stations
Partial diaphragm wall construction at Greenways Road Station
Chennai Metro鈥檚 Progress on Line 3
With TBM Adyar鈥檚 breakthrough, 10 tunnel breakthroughs have been completed on Line 3. Other notable breakthroughs include:
Siruvani (DZ1040) 鈥� Sterling Road (703m) 鈥� August 2024
Kaveri (S-1327A) 鈥� Adyar Junction (1,228m) 鈥� September 2024
Palar (DZ1041) 鈥� Sterling Road (700m) 鈥� October 2024
Pushing Forward
As Chennai Metro Phase 2 progresses, each breakthrough brings the city closer to a seamless urban transit system. A CMRL official noted, 鈥淭hese milestones reflect the dedication of our teams in overcoming challenging tunneling conditions to enhance Chennai鈥檚 metro connectivity.鈥�
With more breakthroughs expected in the coming months, Chennai Metro continues to shape the city's urban transport landscape.
Larsen & Toubro鈥檚 (L&T) tunnel boring machine (TBM) Adyar (S-1326A) has achieved its first breakthrough at Adyar Junction for Package TU-02 on Chennai Metro Phase 2鈥檚 Line 3. This milestone marks the fourth breakthrough in the 12 km tunnel stretch between Kellys and Taramani Road Junction stations.
The 116.1 km Phase 2 project aims to improve connectivity across Chennai, with Line 3 spanning 45.8 km and 49 stations鈥�20 elevated and 29 underground.
A Key Milestone for Chennai Metro
TBM Adyar, a 100m-long Herrenknecht earth pressure balance (EPB) machine, began its assignment at Greenways Road Station in April 2023. Over 22 months, it navigated complex geological conditions, including constructing a 300m tunnel under the Adyar River, before breaking through at Adyar Junction.
L&T has deployed eight TBMs for twin tunnel construction under Package TU-02, which involves building 24 km of tunnels.
Project Background & Scope
L&T secured Package TU-02 from Chennai Metro Rail Ltd. (CMRL) in May 2021 for Rs. 23.85 billion ($286 million), with a 42-month deadline. The contract covers:
Twin tunnel construction between Kellys and Taramani Road Junction
Diaphragm walls and entry/exit structures for Chetpet, Royapettah Government Hospital, and Thiruvanmiyur stations
Partial diaphragm wall construction at Greenways Road Station
Chennai Metro鈥檚 Progress on Line 3
With TBM Adyar鈥檚 breakthrough, 10 tunnel breakthroughs have been completed on Line 3. Other notable breakthroughs include:
Siruvani (DZ1040) 鈥� Sterling Road (703m) 鈥� August 2024
Kaveri (S-1327A) 鈥� Adyar Junction (1,228m) 鈥� September 2024
Palar (DZ1041) 鈥� Sterling Road (700m) 鈥� October 2024
Pushing Forward
As Chennai Metro Phase 2 progresses, each breakthrough brings the city closer to a seamless urban transit system. A CMRL official noted, 鈥淭hese milestones reflect the dedication of our teams in overcoming challenging tunneling conditions to enhance Chennai鈥檚 metro connectivity.鈥�
With more breakthroughs expected in the coming months, Chennai Metro continues to shape the city's urban transport landscape.
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