Underpass Greencity Zürich - Switzerland
Skidding of underpass

Scope of work performed

Skidding of 460t underpass


STRABAG Switzerland



VSL Entity

VSL Heavy Lifting


August 2015

Project Description

Greencity Zürich is a beacon of sustanibility for Switzerland. This will be the first city quarter meeting the standards of the "2000 Watt Society". On the 8 hectar former ground of the Sihl paper factory a new district combining living, working and leisure is being created. 

VSL Heavy Lifting was appointed to skid the new underpass into the gap of the railway dam. For this operation the railway traffic had to be stopped over the weekend which meant a very narrow time slot.

Within 54 hours the team of VSL, STRABAG and SZU (Railway Sihltal Zürich) carried out the following works: dismounting of  the railway line, ground works for the gap, fundaments and walls, skidding of the precast concrete underpass and finally the replacing of railway line. 

The underground was difficult and the underpass had to be placed with millimeter precision. The VSL Skidding System VSS enabled a very fast installation and demounting of the equipment. The skid beams were additionally equipped with hydraulic jacking units which allowed to balance height differences of the underground up to 8mm during the skidding operation.

As planned the trains were operation again Monday morning. 

The complete job report will be available soon. 

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