Janakpuri Noida Corridor
Under its III phase Delhi Metro Rail Corporation, is currently constructing its deepest tunnel at 29 mts below another line. The 37 km long corridor from Janakpuri west to Botanical Garden in Noida, will pass through the existing Hauz Khas corridor with station at a depth of 29 metres against the normal depth of existing stations at 17 metres. To prepare for this engineering feat, Delhi Metro has begun a massive upgrade of construction infrastructure. Its unique aspect includes the topography and design of the station, the mode of construction and machinery deployed. The major challenge in this project is the construction of a tunnel below the existing one. The two tunnels will be separated by just three metres. To balance the pressure due to torque of the moving rail coaches in the tunnel and to ensure zero settlement of soil, real time online monitoring would be carried out constantly at diaphragm wall for which crack meters are proposed to be installed. In an attempt to ensure hassle free and residential properties remain unaffected, Mass Spring System will be used to mitigate the vibration. To curtail the noise during construction, sound absorbing material would be attached at the barriers, said official sources.