DMRC completes work on two parallel tunnels
6 Aug 2014 6:03 AM IST
‘The two TBMs (tunnel boring machine) named ‘Riddhi’ and ‘Siddhi’ emerged out at the Dabri Mor station after boring 1.2 kilometre long twin tunnels. While one of the TBMs was inserted in December last year, the other TBM had started work in January earlier this year. These are the first tunnels to be completed on this corridor,’ said a DMRC spokesperson.
He also added, ‘this is the first occasion when twin tunnels have been completed together in any Metro project in India. The decision to go for a twin TBM breakthrough was taken since both the TBMs were progressing almost simultaneously.
The first such instance of a twin breakthrough had happened during work on the 8.6 kilometre long Toronto-York Spadina subway extension in 2002.’ According to the DMRC, the construction of these tunnels was a major engineering challenge as they passed below densely populated residential as well as commercial areas. Extensive geotechnical instrumentation and monitoring was done to ensure the safety of the structures above.
This tunnel is a part of the 36 kilometre long Janakpuri West – Botanocal Garden corridor of phase 3 under which about 21 kilometres of underground lines are being built. This corridor is expected to be operational by 2016. As part of its third phase of expansion, DMRC is slated to construct about 53 kilometres of underground lines for which 35 TBMs are expected to be used. Presently, about 28 TBMs are engaged in tunnelling works in different parts of the national capital. In Phase 2, 14 TBMs were used for the construction of tunnels.
He also added, ‘this is the first occasion when twin tunnels have been completed together in any Metro project in India. The decision to go for a twin TBM breakthrough was taken since both the TBMs were progressing almost simultaneously.
The first such instance of a twin breakthrough had happened during work on the 8.6 kilometre long Toronto-York Spadina subway extension in 2002.’ According to the DMRC, the construction of these tunnels was a major engineering challenge as they passed below densely populated residential as well as commercial areas. Extensive geotechnical instrumentation and monitoring was done to ensure the safety of the structures above.
This tunnel is a part of the 36 kilometre long Janakpuri West – Botanocal Garden corridor of phase 3 under which about 21 kilometres of underground lines are being built. This corridor is expected to be operational by 2016. As part of its third phase of expansion, DMRC is slated to construct about 53 kilometres of underground lines for which 35 TBMs are expected to be used. Presently, about 28 TBMs are engaged in tunnelling works in different parts of the national capital. In Phase 2, 14 TBMs were used for the construction of tunnels.
Next Story
