Larsen & Toubro’s tunnel boring machines DZ669 (Avni) and DZ670 (Urja) arrived in Bangalore city on February 20 for excavating and building tunnels on the 13.885 km Dairy Circle – Nagawara underground section of Bangalore Metro’s 21.386 km Line-4 (Reach 6 / Pink Line) of the 73.92 km Phase 2 project.
Both Ø6.65m slurry machines were dispatched from tunnel boring machine (TBM) manufacturer China Railway Construction Heavy Industry Co., Ltd. (CRCHI)’s plant in Changsha, China back in November 2019 after completing factory acceptance tests (FAT), and made a touch-down at Chennai Port in early February from where its parts were loaded on top of trailers and brought to Bangalore over a roughly 250 km road journey.
Per the tunneling plan, TBM Avni will first be launched from Shivaji Nagar Station to build tunnels on the line’s 2.755 km package RT-02 (Vellara Road Station – Shivaji Nagar). It will later be followed by another TBM, nicknamed Lavi, which passed FAT in December 2019. Further north, TBM Urja will be launched from Cantonment Station to build tunnels on the 2.884 km package RT-03 (Shivaji Nagar Station – Tannery Road), and it will later be followed by TBM Vindhya.
Here’s a general alignment of the line. The BMRCL in January 2018 decided to stick with their decision to place the Cantonment Station at Bamboo Bazaar (see location) instead of the original location which was closer to the railway station (as depicted below).
For more updates, check out the Bangalore section of The Metro Rail Guy!