PROJECTSubway tunnels

Subway tunnels

Subway tunnelsSeoul Subway Line 9 (C917)
Category T / K Basic Design
Client Seoul Metropolitan Government Office of Subway Construction
Contractor Hanjin Heavy I & C
Period October 24, 2007 ~ February 28, 2008
Project Information
    • Location
      Samseong-dong, Gangnam-gu, Seoul ~ Jamsil-dong, Songpa-gu, Seoul, Korea


    • Scale  
      • Total L = 1,590m
      • Tunnel L = 1,337m
      • Station L = 165m   
      • Shafts L = 88m                            


        • Technical Issues
          • Design of extra retaining structures for the Tan stream section, using sheet piles and H-piles for soil and soft rock respectively, and Geo-tube for the prevention of water pollution
          • Design of the tunnel, passing through alluvium zone, using horizontal jet grouting, water stop grouting, and reinforced pipe umbrella method
          • Improvement of the constructability by changing the girder shape of 2-Arch tunnel station (ESCO patent regarding watertight and drainage)
          • Design of the tunnel under the existing subway, the baseball stadium and the fire station