TBM S711 Makes a Breakthrough at Chennai Metro’s Korukkupet Stn
TBM S711 – a Herrenknecht tunnel boring machine operated by Afcons Infrastructure today made a successful breakthrough at Chennai Metro’s Korukkupet Station in north Chennai – 5 months ahead of its scheduled target of February 2018.
After building tunnels for Chennai’s UAA-01 project, this TBM was commissioned on April 25 2017 from the Washermenpet Station to build the 1818.6m down-line tunnel of the 2.4 km UAA-08 project between Washermenpet and Korukkupet on the 32.10 km Line-1 between Chennai Airport and Wimco Nagar. The earth pressure balance machine built a total of 1299 rings in just 5 months aided by north Chennai’s favorable soil profile which comprises of silty sand, fine sand and clay. Along the way, it made a ‘hidden’ breakthrough at Sir Theagaraya College Station in June as the station’s excavation was still underway.
Package UAA08: Washermenpet – Korrukupet – view Chennai Metro map & information
Perforated D-wall – Photo Copyright: Karthick
Photo Copyright: Afcons
Breakthrough! – Photo Copyright: Afcons
Photo Copyright: Afcons
Photo Copyright: Afcons
Local news coverage –
The 1st TBM on this section, a Robbins EPB machine, was commissioned in March 2017 to build its parallel up-line tunnel and has another 330 rings (approx 462m) left to reach Korrukupet Station.
For more updates, check out the Chennai section of The Metro Rail Guy!
– TMRG
So just 3 more pending now….can’t wait. What is the status of 703 and 704?
As of Sept 16 –
S703 – 120 rings
S704 – 425 rings
Afcons expects S703 to arrive at AG-DMS between Oct 10-15.
Is this the new extension or the section abandoned by gammon india ltd
This is the new extension.
Three breakthroughs expected next month. One on this extension line and 2 more at AG-DMS on Anna Salai( Mount Road).
With this all tunneling work for phase one would be complete.
Thank you
Robbins and S704 should arrive some time in Nov-Dec. It’ll be a great moment!
gr8 news!
thn whether the same TBMs ll b used for phase 2?any news on CG approval yet fr phase 2?
Depends on CMRL’s tunnel specifications and if the same contractors (Afcons & L&T) win contracts.
Before CG’s approval, the project needs the state government’s cabinet approval. I haven’t seen that.
When station construction will start for elevated corridor from TONDIARPET to WIMCO NAGAR?
Contract is yet to be awarded. Piling work got awarded to NCC earlier this year in Feb.