Created on : December 2011 CASE STUDY CASE STUDY 2 Kolkata Metro Railway Kolkata Metro Railway The second phase overcomes the problem New Method of Construction CICO - Becomes a Partner in Progress CICO CICO CICO The Metro Rail Project at Calcutta involved construction of an underground tunnel in the city. During the first phase of the construction work, the job was divided amongst a number of contractors. Numerous difficulties were experienced by the contractors working on the project especially in mass concreting by conventional methods. The numerous construction joints and porous concrete, turned out to be a source of heavy water ingress into the tunnel. And the tunnel had to be reasonable dry for operating Metro Services on schedule and undisrupted. The heavy water ingress

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