Mumbai Metro Update: TBM (Tunnel Boring Machine) Begins Tunnelling For Metro-3 In Mahim

Mumbai Metro Update: TBM (Tunnel Boring Machine) Begins Tunnelling For Metro-3 In Mahim

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Date of Post: 11 Nov, 2017

Mumbai: Work on the upcoming Mumbai Metro-3 entered a crucial stage with excavation work started by a TBM (Tunnel Boring Machine) in Mahim on Friday, officials said.

This is the first of the three TBMs which have already been lowered in launching shafts, one at Azad Maidan in south Mumbai and two in Mahim.

Top officials including MMRC (Mumbai Metro Rail Corporation) Managing Director Ashwini Bhide and others were present to witness the first excavation work by the TBM at Nayanagar.

Image Credit: MMRC

TBM Starts Tunneling

  • Ashwini Bhide, Managing Director, Mumbai Metro Rail Corporation (MMRC), said, “With this, tunnelling for the underground corridor has begun in the city. This TBM will tunnel up to Dadar. Since it is hard rock, the machine will travel a distance of 8-14 metres per day.”
  • The TBM is expected to travel a distance of 2.5 km and reach the retrieval shaft in Dadar by September 2018.
  • “Currently, five TBMs have reached here. Of them, three have been lowered and two more will be lowered by next month. While one of them has begun tunneling, the other TBM should begin in a month. Seven more TBMs are in transit, while the Factory Acceptance Test (FAT) for five more TBMs are pending. However, all 17 should be in the city by March next year,” added Bhide.

Image Credit: MMRC

  • These TBMs will carry out boring 25-30 metres below the ground level in what is mostly rocky strata on the entire Metro Line 3 corridor, which will be the city’s first running fully underground.

The Metro-3 Line

  • The Mumbai metro Line 3 will run 33.50 km between Colaba-Bandra-SEEPZ with two underground stations & one at ground level, totally costing a little over Rs 23,000 crore.
  • For this, the MMRDA (Mumbai Metropolitan Region Development Authority) has imported at least 17 TBMs, of which four have already arrived & the remaining 13 are expected by February next.

Image Credit: MMRC

  • The TBMs shall be launched through 7 shafts and start boring the metrol tunnels from various points like Cuffe Parade, Chhatrapati Shivaji Maharaj Terminus, Mumbai Central, Worli, Bandra Kurla Complex, Mumbai Airport & Marol Naka.
  • A MMRDA spokesperson said, the entire tunneling activity is likely to be completed within 2 years & the Metro Line 3 is expected to be operational on schedule by December 2021

Image Credit: MMRC

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