Tunnel boring machine manufacturer Herrenknecht this week completed factory acceptance tests (FAT) on TBMs S-710 and S-1134 for constructing the 65.1 km Delhi Metro Phase 4 project.
Both refurbished Ø6.63m diameter Earth Pressure Balance (EPB) machines will be deployed by Afcons Infrastructure along with 2 other machines to build twin tunnels on Package DC-05 of the Magenta Line’s 28.92 km Janakpuri West – RK Ashram extension.
7.46 km underground Package DC-05 will connect a ramp north of Derawal Nagar with RK Ashram via 6 stations at Derawal Nagar, Ghanta Ghar, Pulbangash (interchange with Red Line), Sadar Bazar, Nabi Karim & Ramakrishna Ashram Marg (interchange with Blue Line).
Afcons was awarded Package DC-05’s Rs. 2481.50 crore contract by the Delhi Metro Rail Corporation (DMRC) in January 2022 with a 42 month deadline.
TBM S-710 had previously been deployed by Afcons in Chennai (2015-2017) to work on Phase 1’s Package UAA-01 between Egmore & May Day Park – Washermenpet.
It was then brought to Ahmedabad (2018-2020) to work on Phase 1’s Package-1 between East Ramp – Kankaria East – Kalupur where it recorded a historic final double breakthrough along with TBM S-1134 just 10 months after their launch.
Besides these 2 machines, Afcons will be deploying Robbins 367, which passed FAT in Gurgaon in December 2022, and a new Robbins machine 373.
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