Delhi: Work starts on corridor with metro’s first ‘double deck’
NEW DELHI: The work on the 22km Aerocity-Tughlaqabad corridor, which will connect the high-speed Airport Express Line with two busy corridors — Yellow (Samaypur...
- Aug 19, 2020
NEW DELHI: The work on the 22km Aerocity-Tughlaqabad corridor, which will connect the high-speed Airport Express Line with two busy corridors — Yellow (Samaypur Badli-HUDA City Centre) and Violet (Kashmere Gate-Raja Nahar Singh, Ballabhgarh) lines — was started by Delhi Metro Rail Corporation (DMRC) on Monday.
This includes casting work of U-girders for the 4.2km elevated section of this largely underground corridor. The casting of the 28m U-girders is being done at a yard in south Delhi’s Pushp Vihar. Four elevated stations — Sangam Vihar, Khanpur-Deoli, Ambedkar Nagar and Saket G-Block — will be constructed on this stretch.
In a first, Mehrauli-Badarpur Road in south Delhi will see a 2.4km double-decker viaduct with the metro corridor on top and a six-lane flyover below. Apart from this, a six-lane underpass will connect Saket G-Block to Sangam Vihar.
“After the construction of this section, MB Road will be signal free from Sangam Vihar to Saket. A ramp will facilitate seamless traffic movement from Lal Bahadur Shastri Marg to MB Road. An underpass will allow smooth movement of traffic from MB Road towards Lal Bahadur Shastri Marg,” said Anuj Dayal, executive director (corporate communications), DMRC.
The Saket G-Block station will be an interchange between the Aerocity-Tughlaqabad corridor and the proposed Lajpat Nagar-Saket G-Block corridor of Phase-IV, which is yet to get the Centre’s nod.
“The Aerocity-Tughlaqabad corridor will have 15 stations. Despite facing a labour shortage, DMRC is moving ahead with the construction work on all the three corridors of Phase-IV approved so far. Under this phase, 61.6km of new lines will be constructed across three corridors comprising 45 stations. These new sections will provide inter-connectivity among the already operational sections,” said Dayal.
Over the years, DMRC has used different types of precast structures, such as box girders, I-girders and U-girders to construct its corridors. For Phase-IV, DMRC has decided to standardise the usage of U-girders for the entire network to save time and lower construction cost.
U-Girders are precast, pre-tensioned, U-shaped girders on which tracks can be laid immediately. These girders are readied in casting yards and brought to the sites. “Metro projects across the world extensively use this technology nowadays, which saves time in construction besides ensuring better quality. The girders are set up at the site with the help of high-capacity cranes or launchers,” Dayal said.
The casting work of these girders requires meticulous precision and planning. “Optimum care has to be taken to maintain all measurements and technical parameters during the casting process. At the Pushp Vihar yard, four U-girder casting beds have been set up, apart from a dedicated quality control laboratory to monitor all parameters,” Dayal said.
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