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  High -Luminosity LHC Project at CERN

  CERN, the European Organization for Nuclear Research, is an intergovernmental organization that enables international collaboration in the field of high-energy particle physics research. CERN designs, builds and operates particle accelerators and the associated experimental areas, which are housed in a complex network of underground tunnels, galleries and caverns in the Geneva Basin. CERN’s HighLuminosity LHC project covers two nearly identical construction sites in Switzerland and neighbouring France on which a new shaft, cavern, underground galleries and industrial buildings are being constructed to house new accelerator equipment and services. The new galleries have been excavated using traditional methods in molasse, close to the existing ATLAS and CMS detector caverns, and connect to the existing LHC tunnel. The works were tendered in 2017 and construction started on site in 2018. Two engineering joint-ventures provide design and construction management services on site. Two construction joint-ventures hold re-measurable construction contracts of approximately 67 million CHF each with a duration of around 53 months. The works are rather complex due to the variety of structures and excavation sections, the connections to the existing LHC tunnel and the access constraints imposed by the single shaft at each site.

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