The HL-LHC underground works at Point 1 are entering their final half year and are currently approximately 80% complete. The concrete final lining has been cast in all underground galleries and the US/UW cavern. The connections between the UPR13/17 galleries and the LHC tunnel were successfully created and handed over on time to CERN in 2020. The final floor finish is currently being cast in the UR and UL galleries. The waterproofing membrane is being installed in the PM17 shaft, after which the final lining will be cast in one continuous operation lasting approximately 12 days using a slipform system (as is often used on the concrete cores of high-rise buildings). The production of the concrete prefab elements for the shaft staircase is in full swing at the contractor’s precast factory in canton Solothurn. Once the underground structures are painted, the steel structures will be installed in the cavern and as well as the steel staircase modules in the shaft. The underground works are scheduled to be completed by the end of summer 2021.
By Pieter Mattelaer and Milton Morais, SCE-PPM.
HL - LHC civil engineering status (Point 1)