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DL E&C has patented a slip-form method for constructing vertical tunnels over 100 meters deep, aiming for commercialization to enhance pumped-storage power generation. This technology allows the slip-form to float during installation, enabling simultaneous work in upper and lower sections, thus reducing construction time by 20%.

The company recently completed a 120-meter vertical tunnel in Busan using advanced Raise Boring Machine (RBM) technology. DL E&C plans to apply this method to the Yeongyang Pumped-Storage Power Plant project and aims to leverage its expertise to capture opportunities in the growing pumped-storage market.