The Indian capital can be now considered, on a global scale, as one the cities where the largest tunneling project has ever been undertaken. According to the Delhi Metro officials this is not an understatement considering the 19 Tunnel Boring Machines (TBM) that are simultaneously working underneath the city. Phase III of the metro expansion is expected to complete by the end of the year.
According to a Delhi Metro Rail Corporation (DMRC) spokesperson, the parallel use of 19 TBMs within the limits of one city "is probably among the highest used anywhere in the world". Phase III of the metro expansion involves over 53km in tunneling works, 74 different tunneling drives summing up to 37 kilometers. It is estimated that 35 TBMs will be required for the completion of the third phase of the expansion, while so far 21 kilometers and 33 tunneling drives have been completed. For their construction, tunneling drives have passed under railway tracks, existing Metro tunnels and viaducts and flyovers and more importantly, without requiring disruption of traffic flow above or below ground.
Source: TheHindu.com
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