PROJECTRoad tunnels

Road tunnels

Road tunnelsNational Road No.1 for Administrative City (C1)
Category T / K Basic & Detailed design
Client Korea Land Corporation
Contractor Posco E & C
Period September 20, 2007 ~ August 26, 2008
Project Information
  • Location
    Garam-dong, Sejong-si ~ Dajeong-dong, Sejong-si, Korea


  • Description
    • Total L = 1,981m
    • U-Type L = 541m
    • Box-Type L = 255m
    • 2-Arch L = 1,185m


  • Technical Issues
    • Application of the impermeable waterproof layer composed of soil and bentonite on the center column of 2-Arch tunnel for the solution of drainage troubles, commonly happens in 2-Arch tunnels
    • Installation of the compositive ventilation system using a jet fan and an airduct in tunnel for improvement of the urban underpass road conditions