Tata Projects Ltd. (TPL) on Thursday celebrated tunnel boring machine S99’s breakthrough at 116.1 km Chennai Metro Phase 2 project’s Venugopal Nagar Shaft.
This was TBM S99 (nicknamed TBM Servarayan)’s first ever tunnel breakthrough and the 3rd of 24 breakthroughs planned on 45.4 km Line-3‘s civil package TU-01 connecting Venugopal Nagar – Kellys.
TPL’s tunneling crew had commissioned this Ø6.61m diameter Terratec Earth Pressure Balance (EPB) machine from Madhavaram Milk Colony Station’s north shaft in May 2023. It traveled 415m to build the down-line tunnel towards Venugopal Nagar Shaft in roughly 4 months.
Chennai Metro Rail Ltd. (CMRL) had awarded Tata Projects with Package TU-01’s Rs. 1999 crore contract in May 2021 with a 42 month deadline.
TBM Seravarayan along with 6 other TBMs will build approximately 9 km twin tunnels (total 18 km) on Line-3’s Venugopal Nagar – Kellys underground section. The scope also includes construction of diaphragm walls, entry/exit structures of Madhavaram Milk Colony Station, Murari Hospital Station, Ayanavaram Station and Purasaiwakkam High Road Station.
The parallel up-line tunnel was built by TBM S98 (Anaimalai). That machine had recorded the entire Phase 2 project’s 1st breakthrough at this shaft in June 2023.
With 3/24 breakthroughs squared away by TBMs S98, S96 and S99, the next breakthrough by Tata’s 4 new Terratec machines will be recorded by TBM S97. That machine is currently boring the 1.4 km down-line tunnel from Madhavaram Milk Colony Station towards Madhavaram High Road Station, and I expect it to show its face in the November-December timeframe.
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