VSL International (for Vorspann System Losinger) is a specialist construction company founded in 1954. VSL contributes to engineering, building, repairing, upgrading and preserving transport infrastructure (bridges, tunnels, retained earth walls for roads), buildings and energy production facilities. Based in Switzerland, VSL is owned by French construction company Bouygues.
VSL specialises in post-tensioned concrete, stay-cable systems and heavy lifting, while its subsidiary Intrafor focuses on ground engineering and foundations. The company has also developed its proprietary systems, mostly related to post-tensioning and stay-cable, and has 370 patents.
| VSL International | |
| Foundation: | 1954 |
| Location City: | Bern |
| Location Country: | Switzerland |
| Key People: | Jean-Yves Mondon (CEO) |
| Areas Served: | Worldwide |
| Industry: | Construction |
| Services: | Post-tensioning Stay cables Heavy lifting Foundations and ground engineering Civil works (bridges and containment structures) Buildings Repairs |
| Num Employees: | 4,000 |
| Owner: | Bouygues |
In 1943, the Swiss construction company Losinger started to build post-tensioned bridges and began the development of its own post-tensioning system.
The patent of this wire-based system was registered in 1954 and Vorspann System Losinger was created to help develop this activity. The patent was first applied in 1956 for the construction of the Pont des Cygnes bridge in Yverdon, Switzerland.
In 1966, VSL launched its strand post-tensioning system. In 1978, VSL's stay cable system was installed for the first time on the Liebrüti bridge in Kaiseraugst, Switzerland.
While the company developed internationally from the 1970s, in 1991, VSL joined the Bouygues group following the purchase of Losinger.
In 2001, VSL diversified its activity to ground engineering.
VSL is headquartered in Bern in Switzerland, where the company was founded. In 2015, Jean-Yves Mondon was appointed chief executive officer. VSL operates in more than 30 countries, mostly in Asia, Oceania, the Middle East, Europe and South America.
VSL's activities are organized in 4 business lines to engineer, build, repair, upgrade and preserve transport infrastructure (bridges, tunnels, retained earth walls for roads), buildings and energy production facilities:
Among the most important projects VSL has carried out or taken a part in are:
Other known projects include:
VSL also provided heavy lifting (with hydraulic jacks) for fifteen segments of the CMS detector of the Large Hadron Collider.