Engineers from Larsen & Toubro on Thursday began site acceptance tests (SAT) on their tunnel boring machine (TBM) Urja at Cantonment Station for building tunnels on the 21.386 km Line-4 (Reach 6 / Pink Line) of the 73.92 km Bangalore Metro Phase 2 project.
This Ø6.67m slurry machine (DZ670) was dispatched from TBM manufacturer China Railway Construction Heavy Industry Co., Ltd. (CRCHI)’s plant in Changsha after completing factory acceptance tests (FAT) in November 2019. The machine’s parts arrived in the city in February and workers began lowering them into the station’s southern-end in March.
Per the tunneling plan, this TBM along with TBM Vindhya, visible in one of the images below, will exclusively build tunnels on the 2.884 km package RT-03 (Shivajinagar – Tannery Road) which was awarded by the Bangalore Metro Rail Corporation Ltd (BMRCL) in February 2019. The machines will first travel to Shivajinagar and then be brought back to the Cantonment Station for building tunnels towards Pottery Town and Tannery Road stations.
Earlier this month, BMRCL’s Director of Projects revealed to the New Indian Express that excavation can not begin without CRCHI’s tunneling experts due to warranty conditions, so it’ll be interesting to see if and when actual excavation begins with local tunneling experts. The way things are going, I do not expect BMRCL to provide an advance notice or plan a grand event for it.
For more updates, check out the Bangalore section of The Metro Rail Guy!