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.