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The Delhi Metro Rail Company (DMRC) is growing greater than 40 kilometers of latest underground corridors as a part of its Section 4 growth, which constitutes round 50 per cent of the full strains being developed throughout 5 completely different corridors, in accordance with a senior DMRC official.
It’s establishing a complete of 27 underground stations in Section 4.
The DMRC has already accomplished a small underground part from Janakpuri West to Krishna Park of about two kilometres. That is an extension of the Magenta Line, the officer stated.
The Delhi Metro is establishing 40.109 kilometres of latest underground corridors as a part of its Section 4 growth, underneath which about 86 kilometres of latest strains are being laid throughout 5 completely different corridors.
It is a main engineering problem for the reason that underground corridors are passing by a wide range of strata reminiscent of crowded residential in addition to business areas in Sadar Bazar, Nabi Karim, the Mehrauli Badarpur Highway, Ajmal Khan Park, New Delhi and so on., he stated.
Usually, DMRC constructs the underground metro stations utilizing standard cut-and-cover know-how whereas the tunnels are constructed with the assistance of tunnel boring machines (TBM), the officer stated.
A TBM is a machine used to excavate tunnels with a round cross-section by a wide range of soil and rock strata. They are often designed to bore by something from laborious rock to sand, he said.
A small part on the Aerocity-Tughlakabad hall close to Tughlakabad can even be constructed utilizing the NATM know-how (New Austrian Tunnelling Technique). This technique of tunnelling has additionally been used earlier by the DMRC with nice success, the officer stated.
TBMs are particularly helpful for underground tunnelling work in congested city areas. The DMRC has been utilizing TBMs for its tunnelling work since Section 1. In Section 3, when about 50 kilometres of underground sections had been constructed, about 30 TBMs had been pressed into service within the nationwide capital, he stated.
Presently, seven completely different tunnelling drives have been accomplished throughout the Section 4 corridors and 9 drives are in progress at completely different areas.
“Whereas the Aerocity-Tughalakabad hall may have about 19 kilometres of underground hall, the Janakpuri West–RK Ashram Marg hall may have about 9 kilometres of underground sections. The Inderlok–Indraprastha hall may have over 11 kilometres of underground strains. The Majlis Park–Maujpur and the Lajpat Nagar-Saket G Block sections won’t have any underground stations,” the officer stated.
DMRC is monitoring the tunnelling work intently and crucial instrumentation has been completed to make sure that the situation of the buildings above are frequently monitored, he added.
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