DMRC has achieved yet another milestone as the 1st tunnel boring machine of Phase 4 started boring a 1.4 km long tunnel from Vikaspuri to Krishna Park Extension today as part of 2.2km long underground stretch from Janakpuri West to Krishna Park Extension. The tunnelling drive began in the presence of DMRC/MD Dr. Mangu Singh and other senior officials.
In October last year, the lowering and assembling process of the giant 73-metre long machine had started. After completion of tunnelling, this machine will be taken out from the retrieval shaft being built with Krishna Park Extension underground station.
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The tunnelling started from the Vikaspuri area in continuation of the Delhi Metro Magenta line tunnel that has been already constructed for the presently operational Delhi Metro Botanical Garden – Janakpuri West corridor. The tunnel will be constructed approximately at a depth of 14 to 16 metres. About 2,040 concrete rings will be installed in the tunnels. Each tunnel will have an inner diameter of 5.8 metres. The entire tunnelling work on this stretch is expected to be completed in about 12 months. The alignment of the tunnel runs along the outer ring road and below the multi-storied built-up structures.
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The tunnel will be built up with proven technology of EPBM (Earth pressure balancing method) with a concrete lining made up of precast tunnel rings. The tunnel rings are being cast at the fully mechanized casting yard setup at Mundka. The concrete segments are cured with steam curing system to achieve early strength. The TBM will be able to carry out tunnelling up to 10 metres per day.
As part of the Phase-4 work approved so far, about 27 kilometres of underground lines will be constructed. The Janakpuri West – RK Ashram Marg corridor will have underground sections of 7.74 kilometres in total. Once operational, the stretch will be a big boon to Janakpuriwalas for connecting with North Delhi.
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