As the first TBM breakthrough for the UG-01 contract, the upline TBM, Eagle, has broken through at Thirumayilai on Corridor 4, whereas on Corridor 3, the downline TBM, Noyyal, arrived at the Mandaveli shaft on 7 February.<\/p>\n
Launching TBMs Noyyal and Vaigai, excavation between Greenways Station and Mandaveli Station on Corridor 3 was commenced in September 2023, and the TBM Vaigai achieved its breakthrough on the upline in October last year.<\/p>\n
The latest breakthrough is the eighth on the TU-02 contract.<\/p>\n
With 763m length, this tunnel is executed by Larsen & Toubro Ltd and passes beneath densely built-up areas, with an overburden ranging from 9-12m and main underground utilities in the Mandaveli shaft area posed additional challenges.<\/p>\n
Due to facing predominantly silty sand and sandy soil conditions the TBMs were operated mainly in closed-face mode. Completing the drive in 449 days, excluding the waiting period near the shaft for completion of shaft construction, a total of 14 cutterhead interventions were carried out on TBM Noyyal.<\/p>\n
Including almost 4km of twin tunnels, the underground section of Corridor 4 from Light House Station to Kodambakkam Flyover has been divided into two packages, UG-01 and UG-02. With the aim of implementing around 16km of tunneling in both directions, four 6.67m-diameter TBMs have been deployed.<\/p>\n
Following commissioning TBMs Eagle and Flamingo in January 2024 tunneling between Light House Station and Thirumayilai Station commenced.<\/p>\n
With an overburden depths ranging from 4.5-23m, TBM Eagle\u2019s 1.98km-long drive, executed by Cemindia Projects Ltd, formerly ITD Cementation India Ltd, passes beneath several historic and sensitive structures, including Chennai Lighthouse, All India Radio, the Russian Embassy, a church and schools, as well as 151 buildings.<\/p>\n
Considering that the tunnel drive encountered challenging geological conditions, including rock strata and gas leakage, particularly near St Raphael\u2019s School, the TBM operated mainly in closed-face mode, with 17 cutterhead interventions, and tunneling was completed over a period of 24 months.<\/p>\n
Stretching from Panagal Park to Boat Club Station under Corridor 4, UG-02, TBM Pelican has started its final drive, whereas this machine had earlier completed a 2km drive from Panagal Park to Meenakshi College, safely passing beneath active Indian Railways tracks.<\/p>\n
Being launched earlier on the same section, TBM Peacock has already completed 370m of a 1.898km drive.<\/p>\n
CMRL\u2019s Phase 2 Metro Rail Project across Chennai city, covers 118.9km across three corridors with 128 metro stations.<\/p>\n","protected":false},"excerpt":{"rendered":"
As the first TBM breakthrough for the UG-01 contract, the upline TBM, Eagle, has broken through at Thirumayilai on Corridor 4, whereas on Corridor 3, the downline TBM, Noyyal, arrived at the Mandaveli shaft on 7 February. Launching TBMs Noyyal and Vaigai, excavation between Greenways Station and Mandaveli Station on Corridor 3 was commenced in September 2023, and the TBM Vaigai achieved its breakthrough on the upline in October last year. The latest breakthrough is the eighth on the TU-02 contract. With 763m length, this tunnel is executed by Larsen & Toubro Ltd and passes beneath densely built-up areas, with […]<\/p>\n","protected":false},"author":5,"featured_media":20120,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4001],"tags":[2049,55,5373,5372,47],"class_list":["post-20119","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-contract-projects","tag-chennai-metro-project","tag-india","tag-larsen-toubro-ltd","tag-tbms-noyyal-and-vaigai","tag-tunneling","post--single"],"yoast_head":"\n