After the first look of ITD Cem’s TBM Tunga yesterday, here’s the first look of Afcons Infrastructure’s third tunnel boring machine that will be deployed for constructing a 3.655 km underground section of Bangalore Metro’s 21.386 km Pink Line (Reach 6) which will connect Nagawara – Kalena Agrahara through 18 stations.
Unlike Afcons’ first two machines which are brand new from China, this Herrenknecht earth pressure balance (EPB) machine is a refurbished machine. It passed passed factory acceptance tests (FAT) in November at Herrenknecht’s Indian plant at Alinjiwakkam, Tamil Nadu, just 10 kms north-west of Chennai, and has since arrived in town.
Like Larsen & Toubro’s four CRCHI machines for Bengaluru and one for Mumbai’s Coastal Road project, this machine proudly sports an Indian flag-themed cutterhead with what appears to be a temporary chakra added for the photo-op.
This TBM along with the other two machines will be deployed by Afcons to build 8 tunnels on Package RT-01 (Dairy Circle Ramp – National Military School) of the 73.92 km Bangalore Metro Phase 2 project which was awarded by the Bangalore Metro Rail Corporation Ltd. (BMRCL) in June 2019 with a contract value of Rs. 1526.33 crore.
The machine’s serial number is unknown at this time, but the other two are confirmed to be S-1259 and S-1260. Like L&T and ITD, Afcons will likely give their 3 machines nicknames prior to commissioning them in the coming months, if not already.
Update: This TBM is S-1264. Here’s a brilliant graphic shared by Herrenknect:
Per the tunneling plan, Afcons’ TBM#3 will build both twin tunnels between a shaft adjacent to the Rashtriya Military School Station and Langford Town Station – a one-way distance of 596 meters. Here’s a snap I’ve shared previously of what’s known as ‘RMS Shaft’ getting ready for it:
Larsen & Toubro has so far commissioned three TBMs (Urja, Avni & Vindhya) while TBM Lavi is still being configured for commissioning by the end of this month towards MG Road Station where excavation is underway.
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