Representatives of the Delhi Metro Rail Corporation Limited, project contractor J.Kumar Infraprojects Ltd, and TBM supplier TERRATEC have celebrated the successful Factory Acceptance Test of a new 6.61m diameter Rock EPBM destined for Delhi Mass Rapid Transit System Project – Phase-IV, Contract DC-08 in India.
TERRATEC has delivered three machine orders for this project, including a combination of both brand-new and refurbished EPBMs, with the new TBM (S111) specifically assigned to construct the 23.62km long, 5.7m-wide Silver Line tunnel, connecting Aerocity to Tughlakabad via 16 stations. The anticipated launch point for TBM S111 is the Aerocity Shaft, while the previously launched TBMs, S63B and S64B, have already commenced their operations from the Kishangarh Shaft.
This new 6.61m diameter Rock EPBM named “Narayani” marks the third deployment by J.Kumar for the construction of twin tunnels spanning 6.116km within the 65.1km Delhi Metro Phase 4 project’s Package DC-08, between Aerocity and Kishangarh stations.
The EPBM has a robust mixed-face dome-style cutterhead designed to work effectively in the expected mixed ground geological conditions. The tunnel alignments are expected to encounter quartzite, sandy silt, and rocks. As the TBM progresses, 1,400mm wide by 275mm thick universal reinforced concrete lining rings will be installed, which consist of five segments plus a key. Muck removal, segment transport and supply of consumables will be facilitated using rail-bound equipment powered by battery locomotives.
TERRATEC’s refurbished EPBM (S86) with a diameter of 6.52m made its second breakthrough at Delhi Metro’s Krishna Park Extension Station in November 2022. This breakthrough not only marked the successful completion of a 2.03km underground extension for package DC-06 but also played a crucial role in expanding the 38.235km Magenta Line (Line-8).