OasisLMS

Chennai city with around 11 million population requires massive infrastructure development to cater to Urban mobility. As part of Urban infrastructure development Chennai metro rail corporation (CMRL), is operating around 47 km. About 120 km of metro line combining elevated and underground sections is planned in Phase 2, which is under implementation. The CMRL planned the construction of Underground stations by installing diaphragm walls as part of the retaining structures. The execution of diaphragm walls is planned using Trench cutters to enhance the quality of construction. Construction joints were made by overcutting the panels instead of a water stopper in conventional diaphragm wall construction. These diaphragm walls are planned with a design life of 120 years plus with stringent quality control and assurance criteria. Since these panels are constructed in an urban environment where concreting and shifting of prefabricated cages are restricted day time requires meticulous planning and implementation. This technical paper focused on the challenges while preparing the working platform for heavy equipment during the high monsoon period, diverting the existing charted and uncharted utilities, making monolithic joints in D-wall between the station box and entryexit with different dimensions of D-walls control the Verticality of the trenching as well the reinforcement. The paper also covers the instrumentation and monitoring mechanism adopted to safeguard the adjoining structures within the influence zone.

Jayarama Haluvally, L&T Heavy Civil Infrastructure; Senthil Kumar K P, L&T Heavy Civil Infrastructure

International Conference Proceedings