Delhi Metro Phase 4: First twin tunnels breakthrough completed, 3 km long tunnels built 14-15 metres underground – Details insideThe Delhi Metro Rail Corporation (DMRC) announced the successful completion of the first twin tunnels breakthrough on the Janakpuri West - R K Ashram corridor, marking a significant achievement in the Phase IV construction project. The twin tunnels, linking Derawal Nagar to Pulbangash, were excavated by two tunnel boring machines (TBMs)...
more... that emerged concurrently at Pulbangash Metro Station. This 3-kilometer-long tunnel drive, spanning over 14 months, is the longest in Phase IV, with the TBMs operating at an average rate of 8.2 meters per tunnel per day. The tunnels, built at a depth of 14-15 meters, pass through densely populated areas like Rana Pratap Bagh and Punjabi Basti Colony, including a section beneath the Najafgarh drain. Despite the challenging environment, the TBMs successfully navigated through submerged water conditions and beneath the under-construction Ghanta Ghar station without causing any damage. The tunnels have an internal diameter of 5.8 meters and feature six cross passages for passenger safety.
Delhi Metro Rail Corporation (DMRC) ne Janakpuri West - R K Ashram corridor pe Phase IV construction project mein pehla twin tunnels breakthrough ka successful completion announce kiya hai. Ye ek bada achievement hai. Derawal Nagar se Pulbangash tak ke twin tunnels, do tunnel boring machines (TBMs) dwara khade kiye gaye...
more... hai, jo Pulbangash Metro Station pe ek saath nikle. Ye 3-kilometer lamba tunnel drive, 14 months se zyada time mein complete hua hai, aur Phase IV mein sabse lamba drive hai. TBMs har din 8.2 meters per tunnel ki average rate se chal rahe the. 14-15 meters ki depth pe bane yeh tunnels, Rana Pratap Bagh aur Punjabi Basti Colony jaise densely populated areas se guzarte hain, aur Najafgarh drain ke neeche se bhi guzarte hain. Mushkil environment ke baavajood, TBMs successfully submerged water conditions aur under-construction Ghanta Ghar station se guzar gaye bina koi damage ke. Tunnels ka internal diameter 5.8 meters hai aur passenger safety ke liye 6 cross passages hain.