DMRC achieves tunnel breakthrough at Tughlakabad Railway Colony on Phase 4's Golden Line
Construction details and safety measures
By ,
ETInfra
The Delhi Metro Rail Corporation (DMRC) has completed another section of underground tunnelling on the Tughlakabad–Aerocity corridor under Phase 4 of the metro network expansion. A Tunnel Boring Machine (TBM) achieved a breakthrough at the Tughlakabad Railway Colony site after completing a 792-metre-long tunnel.The milestone was marked in the presence of Naveen Gulati, Member (Infrastructure), Railway Board, along with senior officials of DMRC. The work was carried out by civil contractor Afcons Infrastructure Ltd Two parallel tunnels are being constructed between Tughlakabad and Tughlakabad Railway Colony stations for up and down train movement. The latest tunnel was constructed at an average depth of 18 metres using a 91-metre-long TBM. A total of 559 concrete rings have been installed, each with an inner diameter of 5.8 metres.The tunnel was built using Earth Pressure Balancing Method (EPBM), with precast concrete segments cast at a mechanised facility in Mundka. A steam curing system was used to achieve early strength for the segments. The construction took place beneath existing built-up areas, with ground movement monitored by sensors installed on nearby structures. DMRC stated that no settlement was observed during the process.The Aerocity–Tughlakabad corridor has 19.343 kilometres of underground sections, forming part of the 40.109 kilometres of approved underground work under Phase 4.Tunnel Boring Machines have been used by DMRC since Phase 1. In Phase 3, when around 50 kilometres of underground lines were constructed, about 30 TBMs were deployed across the capital. These machines are designed to excavate through varying strata and are widely used for tunnel construction in urban areas to minimise surface disruption.
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