Förbifart Stockholm (Stockholm Bypass) is a series of underground expressway tunnels currently under construction between the Kungens Kurva interchange in the south of Stockholm and the Häggvik interchange north of Stockholm. Most of this bypass; more than 17 out of 21 kilometers, is built underground.
The bypass will become the world’s longest tunnel in the proximity of a city. 140 000 vehicles per day are expected to use the bypass.
KFS Finland Oy’s jet grouting team tightened the sheet pile with 70 columns down to the bedrock at Förbifart, Hjulsta Södra.