Despite the fact that already had one of the most advanced public mobility systems in Europe, the Danish capital Copenhagen has created a new underground ring of over 15 kilometres: the Cityringen. Located in the very centre of the city and inaugurated in 2019, the Cityringen develops entirely underground along its wide extension with two tunnels of 17.4 km kilometres each serving 17 new stations at an average depth of 30 meters below the street level. The target obtained with this project was that currently 85% of the inhabitants of Copenhagen live at an average distance of 600 meters from a metro station. The excavation of the tunnels was carried out by means of TBM; only the excavation of a service tunnel, for connection to the maintenance centre, was carried out using the traditional method. 

During the excavations, three million tons of soils were removed, which were used to reclaim a new area into the Baltic Sea and allow the urban development of a new area of the city: the Nordhavn; as many as 500 trucks a day transported the excavated soil. The traffic lights in the city had to be modified to manage this traffic flow. The line, fully automated, operating 24 hours a day, with minimum intervals between trains of just 100 seconds, guarantees the mobility of 72 million passengers a year. The project represented a technical challenge due to its complexity and importance. It is an almost entirely Italian project, with a cost of approximately 21.3 billion crowns; it must be said that the "Cityringen factory" represents the largest project in the city since 1600. Cipa SpA through its subsidiary (100 %) Cipa Denmark ApS was involved in this ambitious project as a subcontractor of CMT - Copenhagen Metro Team I/S group of companies. The activities carried out by Cipa Denmark started in February 2013, initially involving an average of approx. 180 highly specialized resources and equipment, in order to make the complete construction of the stations of Aksel Mollers Have and Frederiksberg, the roof slab of Norrebro and Frederiksberg Allè, the excavation, consolidation and final lining of the Norrebroparken cave, the intermediate slabs of Norrebros Runddel, the bottom slab and the perimeter walls of Nuuks Plads and the Tommergraven ramp and bottom slabs, perimeter walls, central wall, cantilevers, launch of beams and subsequent construction of the roof slab, as well as other minor works such as ground anchors for the bottom slabs of the Tommergraven ramp, shotcrete on piles walls to make the base support for the waterproofing in most of the stations of the project. Subsequently, Cipa Denmark's involvement in the project became increasingly large and was extended to other stations and shafts (Copenhagen H, Gammel Strand, Enghave Plads, Havenholmen) and to other specialized tunnel works (First Stage Concrete, Cross Passages and Pump Sumps), reaching a peak in 2016 where the average workforce was over 500 persons. During the 5 years that Cipa Denmark has been involved in Cityringen, the most representative numbers of its intervention were: - Approx. 107,000 m3 of concrete; - Approx. 22,000 tons of steel for reinforced concrete; - Approx. € 90,000,000 in turnover; - Approx. 2,400,000 hours of specialized work.
Job worksheet
Place: Denmark - Copenhagen
Period: February 2013 - November 2017
Client: Copenhagen Metro Team I/S
Value: 86.448.941 EUR
Status advancement work: 100%

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