Kolkata Metro

The Kolkata Metro project involves extensive underground tunneling and metro station construction to enhance urban transit connectivity. Encardio-Rite played a crucial role in monitoring structural stability for both UG-1 and UG-2 packages, covering 10 km of tunnels, 6 underground stations, and critical safety monitoring. The instrumentation scope included inclinometers, piezometers, extensometers, strain gauges, and real-time data solutions. This project supports efficient metro operations across Kolkata, Salt Lake, and Howrah while ensuring geotechnical safety and infrastructure resilience.

Kolkata Metro

Encardio-rite received the contract for the supply, installation & monitoring work for both UG-1 & UG-2 Packages that consisted of 10 km tunnel, 6 underground stations, 1 cut & cover and 1 cross over.

The scope of work broadly consisted of:

Pre and post construction condition survey for buildings within zone of influence.
Supply, installation of geotechnical and structural instruments used for safety monitoring.
Manual and automatic monitoring.
Programming and commissioning of automatic systems where required.
Daily, weekly and monthly reporting with data evaluation & interpretation.
Calibration of data loggers and sensors.

Instrumentation used included:

Inclinometer system for diaphragm walls and subsurface monitoring around stations and tunnels.
Inclinometer cum Magnetic extensometer for subsurface lateral movement as well as settlement monitoring.
Piezometers (vibrating wire, casagrande and standpipe) for monitoring ground water level and pore pressures.
Center hole load cell for anchors.
Strain gauges for strut monitoring and for pile testing and diaphragm walls.
Borehole extensometer for subsurface settlement and ground settlement points for surface settlement monitoring.
Crack meters, tilt meters, bi-reflex targets, mini prism targets and building settlement points for structure monitoring.
Portable readout units.

Package UG-1

Contractor: Afcons TTA JV (UG 1)

Consultants: General Consultants

The Line 1, also known as North-South Metro of the Kolkata Metro is a rapid transit system serving Kolkata, South 24 Parganas and North 24 Parganas in West Bengal. The line connects Dum Dum and New Garia and uses a 5 ft 6 in (1,676 mm) broad gage rolling stock.

Package UG-2

Contractor: ITD – ITD Cementation JV

Consultants: General Consultants

Line 2, also known as East-West corridor of the Kolkata Metro is a rapid transit system under construction, which will serve Kolkata, Salt Lake and Howrah in West Bengal underneath the Hoogly River. It will consist of 12 stations from Salt Lake Sector V in the east to Howrah Maidan in the west, of which 6 would be elevated and 6 would be underground, with a total distance of 14.67 km.