Groundbreaking for the Civil Engineering work at P1 and P5 of the LHC

Two contracts for the civil engineering works were adjudicated by the Finance Committee of March 2018 to a consortium MARTI TUNNELBAU, MARTI ÖSTERREICH and MARTI DEUTSCHLAND for the Point 1 works and to a consortium IMPLENIA SCHWEIZ, BARESEL and IMPLENIA CONSTRUCTION for the Point 5 works. At each point, the work consists of the construction of an access shaft, a service cavern and underground galleries as well as five surface buildings. The site mobilization of the site started on both Points. The shaft excavations will begin end of June 2018 and should be completed before the end of the year. These excavations will be performed with electrical road-headers in order to minimize the vibration level on the LHC machine and its detectors, which will be in operation with beams during this period. In parallel, the two consultants are progressing in the detailed design of underground structures. The underground excavation works will be completed by mid-2020 during the next long shutdown and the works, including the surface buildings, will be completed in the autumn 2022. The groundbreaking ceremony for the launch of the civil engineering works took place on Friday 15 June 2018 with the presence of the CERN management, the French and Swiss Authorities and the CERN Council.

Fig. 1: The groundbreaking ceremony at Point 5 on June 15th (2018)
Fig. 2: The effect of the first Civil Engineering work on the site surface on the proton losses in the LHC. One can clearly recognize the 22Hz perturbation of the excavation equipment