Two tunnel boring machines simultaneously constructing Lucknow Metro’s tunnels

LUCKNOW: A total of two Tunnel Boring Machines (TBMs) are simultaneously engaged in constructing metro tunnels across the length and breadth of Uttar Pradesh's capital region. The TBMs would be digging two parallel tunnel across 3.5 km underground metro stretch from Charbagh to KD Singh Babu Stadium (near Hazratganj) in Lucknow. Lucknow Metro Rail Corporation (LMRC) officials claim that the Lucknow Metro's underground corridor has emerged as one of the largest tunnelling projects ever undertaken below any major urban centre globally. The team has commenced the tunnelling drive of its second Tunnel Boring Machine (TBM) at the Sachivalaya underground metro station site in the presence of the managing director and other senior officers of the organization in the first week of March, 2017. Metro officials said, "With this, the underground tunnelling work for the 3.5 km Sachivalaya, Hussainganj and Hazratganj section of Phase 1A (North - South Corridor) of Lucknow Metro Rail Project has started ahead of its schedule." The work shall be carried out simultaneously on the 'UP' and 'Down' lines with two Tunnel Boring Machines (TBMs) aptly named 'Gomti' and 'Ganga' after the prominent rivers in the state of Uttar Pradesh. While the first TBM 'Gomti' which was assembled 18 m deep inside the launching shaft at the Sachivalaya Station - commenced operations for the UP line, the second TBM 'Ganga' has begun boring from March's first week onwards. Ganga will commence tunnelling on DOWN line. Officials said that assembly of TBMs is a complex technical process involving lowering of individual parts down the shaft by 250 tonne crane, correct positioning, jointing and providing electrical/hydraulic/water/grouting connections etc. First TBM Ganga was launched for tunnel construction around mid of 2016. The underground metro corridor has to be completed by March 2019.