Drilling with W100 at the Stockholm Central Station, train yard area
The Citybanan rail link project is made up of a number of subprojects. One of these involves the construction of a work tunnel in the track area at Stockholm Central Station. The ground conditions there are extremely difficult. Old filling material, pollutants and high groundwater present special challenges in terms of management and implementation.
The fact that the main line passes at a distance of 5 meters means that no settling was permissible under any circumstances. The contractor, Züblin–Oden Constructors HB, began work in the fall of 2006 with jet grouting to seal the soil between the rock and the sheet piling, because of the strict requirements imposed on the leakage of groundwater.
A total of 500 holes were drilled to a depth of between 10 and 20 meters.