The contracts concluded with the two civil engineering consortia imposed environmental restrictions and, notably, the hiring of experts to perform environmental monitoring on the worksite.
HL-LHC
What will happen to the excavated spoil?
In total, 92,000m3 of spoil were excavated from the underground structures on both sites. The excavated material was analysed on the surface to check its quality and the spoil polluted by hydrocarbon was managed accordingly.
What was the work schedule?
The HL-LHC civil engineering works began in May 2018 and lasted five years. All foreseen underground and surface works were successfully completed in September 2022 at Point 1 and in December 2022 at Point 5.
Who carried out the work?
The HL-LHC civil engineering project is based on four main contracts. Two consultancy service contracts are dedicated to the design and to the construction administration: SETEC–CSD–ROCKSOIL (ORIGIN) at Point 1 and LOMBARDI–ARTELIA–PINI (LAP) at Point 5. Two supply contracts are dedicated to the construction of both the underground and surface structures: MARTI TUNNELBAU - MARTI ÖSTERREICH - MARTI DEUTSCHLAND (JVMM) at Point 1 and IMPLENIA SCHWEIZ - BARESEL - IMPLENIA CONSTRUCTION (CIB) at Point 5.
What civil engineering work was required for the High-Luminosity LHC?
The new equipment for the High-Luminosity LHC requires new large civil engineering structures on the sites of the ATLAS experiment in Meyrin, Switzerland (LHC Point 1) and the CMS experiment in Cessy, France (LHC Point 5).
On each site, the underground constructions consist of:
- A vertical shaft around 80 m deep and 10 m in diameter
- An underground service cavern (16 m in diameter and 46 m long) that will notably house cryogenics, cooling and ventilation equipment