The Delhi Metro Rail Corporation (DMRC) has achieved a tunnel breakthrough on the phase 3 works at Lal Quila Metro Station.
The DMRC has now completed the tunnelling on the Kashmere Gate – Lal Qila stretch of the Central Secretariat – Kashmere Gate Corridor.
The tunnel boring machine (TBM) emerged at Lal Qila metro station site after creating a 1,351m long tunnel from Kashmere Gate.
The TBM was lowered at Kashmere Gate shaft on 6 December 2014 and after the machine was assembled below ground level, the initial drive began on 26 December 2014.
The maximum depth of the tunnel is 16m below the earth’s surface.
An earth pressure balancing (EPB) TBM was used to concrete the tunnel. A total of 967 rings have been inserted. Each ring has five segments (each 275mm thick) and the length of one segment is 1.4m.
The Central Secretariat – Kashmere Gate route is scheduled for completion in March 2016.