Seoul Cable Tunnel
South Korea, Seoul
2002 – 2003
The mother of all pipe jacking projects

The 800-meter-long route for the Seo Cho cable tunnel contained five curves with narrow radii of 200 to 250 meters. A further challenge was a safe advance with a target shaft in the cellar of a multi-storey building, where a new subway station was being built. In the heavily built-up area of Seo Cho it was not possible to set up a deep target shaft without completely blocking off one of the busy streets.

An expanded AVND2400AH mastered the tunnelling job, which can be described as "the mother of all pipe jacking projects". Due to a lack of space at the start shaft the pipes had to be delivered just in time, to save time with regard to handling. An automatic lubrication system kept the thrust forces lower than expected despite the extremely abrasive granite, so that only four of the nine intermediate jacking stations installed had to be used. The project was successfully completed in March 2003.

Data Sheet

Country, Location

South Korea, Seoul


2002 – 2003




Rock, groundwater

Tunnelling length

800 m

Machine Data

1x AVN Machine:
Diameter: 3,060 mm
Lining method: Pipe jacking
Cutterhead power: 315 kW
Torque: 780 kNm

Your contact person Contact us

Steffen Dubé President and General Manager Herrenknecht Tunnelling Systems USA Inc.
Gerhard Goisser Commercial Manager Herrenknecht Tunnelling Systems USA, Inc.