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The lowering and assembly of the passageway boring instrumentality (TBM) has commenced for the operation of a 16 km-long passageway done TBM betwixt Bandra Kurla Complex (BKC) and Sawli (near Ghansoli) successful Maharashtra for the Mumbai-Ahmedabad Bullet Train Project, National High Speed Rail Corporation Limited (NHSRCL) officials said connected Thursday. The 21 km-long passageway is being constructed for the task betwixt BKC and Shilphata successful Maharashtra. The passageway besides features India’s archetypal 7 km-long undersea passageway beneath Thane Creek. Out of 21 km, 5 km of passageway utilizing the New Austrian Tunnelling Method (NATM) is already completed and the remaining 16 km volition beryllium completed done Tunnel Boring Machines (TBM). The passageway volition beryllium a azygous conduit passageway of 13.1 m diameter to accommodate duplicate track. This passageway volition beryllium astir 25 to 57 metres heavy from the crushed level and the deepest operation constituent volition beryllium 114 metres beneath the Parsik Hill. The process began with the lowering of 1 of the six segments of the main shield, weighing astir 170 metric tonnes. This conception measures astir 8.66 metres successful magnitude and astir 7 metres successful width and was lowered astatine a extent of 56 metres beneath crushed level, equivalent to a 20-storey building, astatine Vikhroli. “Two TBMs are being utilized and the tunnelling operations volition commence pursuing broad investigating and commissioning,” officials said. To little the TBMs, 3 shafts person been constructed: a retrieval shaft astatine BKC, and shafts astatine Vikhroli and Sawli (near Ghansoli). “TBM 1 volition commencement from Shaft 2 astatine Vikhroli and volition determination towards Shaft 1 of Mumbai Bullet Train presumption astatine BKC portion TBM 2 volition commencement from Shaft 3 astatine Sawli and determination towards Vikhroli,” officials explained. The 2 TBMs, weighing 3,080 tonnes (TBM-1) and 3,184 tonnes (TBM-2) respectively, are among the astir precocious tunnelling machines deployed successful the country. These precocious TBMs, based connected Mix Shield oregon Slurry technology, are specifically designed to run successful analyzable geological conditions. Each TBM measures 95.32 metres successful full magnitude and comprises respective captious components, including the cutter wheel, main bearing, jaw crusher, erector, main shield, process shield, and 4 specialised gantries that enactment tunnelling operations. These machines tin run astatine a maximum cutter caput velocity of 4 RPM (revolutions per minute), with a maximum excavation complaint of 49 mm per minute, enabling dependable and controlled tunnelling advancement portion maintaining precocious information standards, officials added.
Published - April 09, 2026 07:10 p.m. IST
