Encardio-rite was entrusted with the monitoring work for almost all the packages of Chennai metro i.e. UAA-1, UAA-2, UAA-3, UAA-4 and UAA-5. 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 gages 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 UAA-01

Contractor: Afcons-Transtonnelstroy JV

Consultants: General Consultants

This package included 1 corridor of the Chennai Metro Project – the distance from Washermenpet to the Egmore station. With 5 underground stations, the length of the twin tunnel using the TBM (Tunnel Boring Machine) technique is 5.5 km.

Encardio-rite was awarded the sub-contract for instrumentation, monitoring and survey work of the alignment of the tunnel and of the underground stations at Washermenpet, Mannadi, High Court, Chennai Central and Egmore and May Day Park.

Package UAA-02

Contractor: Gammon – Mosetrostroy JV (GILMMS JV)

Consultants: General Consultants

The Package UAA-2 consisted of twin tunnels with diameter of 6.6 m each. Encardio-rite was the subcontractor for the monitoring and instrumentation work for the underground stations at the Government estate, LIC, Thousand Lights estate and associated tunnels.

Package UAA-03

Contractor: GAMMON – MOSMETROSTROYJV (GILMMS JV)

Consultants: General Consultants

Encardio-rite was awarded the contract for the complete monitoring and instrumentation of package UAA-03 on corridor 1 including four underground stations at Saidapet, Chamier’s, Teynampet, Gemini and associated twin tunnels of about 3.4 km.

Package UAA-04

Contractor: L&T-SUCG joint venture

Consultants: General Consultants

Encardio-rite was responsible for the monitoring and instrumentation work of the underground stations and associated tunnels at Nehru Park, Kilpauk Medical College and Pachaiappa College.

Package UAA-05

Contractor: AfconsTranstonnelstroy JV

Consultants: General Consultants

This package included 2 corridors of the Chennai Metro Project, covering the distance from Shenoy Nagar to Thirumangalam station. With 4 underground stations, the length of twin tunnel with the TBM (Tunnel Boring Machine) technique is 3.1 km.

Encardio-rite was awarded the sub-contract for the instrumentation of underground stations and tunnels at Shenoy Nagar, Anna Nagar East, Anna Nagar Tower and Thirumangalam.