12 years and a number of other obstacles later, E-W Metro tunnelling work is full

12 years and several stumbling blocks later, E-W Metro tunnelling work is complete | Kolkata News - Times of India

Among the many most formidable Metro tasks within the nation, the Rs 8,576-crore East-West Metro hyperlinks the dual cities of Kolkata and Howrah by way of a tunnel that runs under the Hooghly riverbed. (Picture used for representational objective solely)

KOLKATA: The tunnelling work of East-West Metro was accomplished on Saturday night, a day forward of the scheduled ‘breakthrough’ as engineers revved up the tunnel boring machine to achieve the landmark earlier than restrictions kicked in on Sunday.
Among the many most formidable Metro tasks within the nation, the Rs 8,576-crore East-West Metro hyperlinks the dual cities of Kolkata and Howrah by way of a tunnel that runs under the Hooghly riverbed. Whereas the tunnelling was scheduled to be accomplished months earlier, an accident in August 2019 that led to deal with collapses in Bowbazar delayed the undertaking.
On Saturday afternoon, TBM Urvi lined the ultimate 10 metres to pierce the diaphragm wall to finish the Howrah-bound tunnel. Final October, it had accomplished the Kolkata-bound tunnel after which rotated to finish the 800 metres to the cave-in zone the place TBM Chandi had stalled after hitting an aquifer resulting in subsidence. Final yr, a shaft was constructed to extricate Chandi in order that Urvi might full the tunnel.
Kolkata Metro Railway Company (KMRC), the implementing company of the 16km East-West Metro hall undertaking had initially scheduled to cross the ultimate barrier on Sunday afternoon.
The East-West Metro undertaking has crossed a number of milestones alongside its journey. Essentially the most important was on Could 23, when TBM Rachna accomplished the tunnelling below the Hooghly in 36 days. Sibling TBM Prerna adopted and completed the opposite river tunnel on June 21, 2017.
Nevertheless it was the final lap of tunnelling that proved probably the most difficult because the TBMs bored below a congested neighbourhood with crumbling buildings and met with an accident. Sarcastically, it was over the alignment of the identical part that the undertaking was delayed for a number of years in its infancy.

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