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.