Twin Tunnel of 5.80 mtr finish dia – Boring with TBM
Total Length 2 x 3956 mtr in four stretches, likely to be increased.
Concrete lining of 275 mm thickness – Precast Segments.
Cross passage – 12 Nos
Central Station – 225 Mtr – Diaphragm Wall, RCC Structure
Sealdah Station – 200 Mtr – Diaphragm Wall, RCC Structure
Intervention Shaft -118 Mtr – Diaphragm Wall, RCC Structure
Phool Bagan – 199 Mtr – Diaphragm Wall, RCC Structure
Subhash Sarobar – 513 Mtr – Cut & Cover Tunnel, RCC Structure
Three stations namely Khan Market, Jawaharlal Nehru stadium and Jungpura.
Eight cross passages
Ramp at Lajpat Nagar
Set up new Asia Record of tunnelling 37.5 m in a day Completed 2 months ahead of schedule.
Survey & Geotechnical Investigation
Design and Construction of Tunnel by Shield TBM for a length of 6798m of internal finished diameter 5.7-5.8m (4274m in soil & 2524m in weathered rock)
Design and Construction of Cut & Cover Tunnel at other 3 locations of length 152m, 162m & 143m approx.
Design and Construction of Cross Passages & Sumps
Design and Construction of two (02) nos. underground stations at Palam & I.G.D.Airport
Design and Construction of Finishing works for station, Plumbing & Sewage works. Design and Construction of Entry & Exit Structures, Utility galleries, AC plant rooms, DG room Protection, diversion and support of all utilities encountered during construction.
Providing & Fixing Shear Connectors for installation of Rail Track both in Tunnel and Station areas Building Condition survey, risk analysis, settlement prediction, ground and building monitoring, preventive and corrective actions.
Traffic management & diversion required for construction phase.