Final breakthrough on Copenhagen M4 line
5 May 2021The final tunnelling breakthrough on the construction of Copenhagen’s M4 Sydhavn metro extension occurred recently when TBM Olivia holed through at Havneholmen station.
Having spent the past 15 months tunnelling, the Chinese-built machine holed through shortly after sister TBM Inge. On this last leg of their journey, the machine’s have between them created a 4.9m-ID tunnel made up of 5,651 six-segment rings, each 1.4m long and 330mm thick .
First, the machines mined from Enghave Brygge to Ny Ellebjerg where they broke through at the beginning of 2021. They were then hoisted up and transported back to Enghave Brygge, where they drilled the last tunnel section to the Havneholmen metro station.
Connecting the southern part of Copenhagen to the metro system, the 4.5km Sydhavn extension of the M4 line will comprise five new stations (also connected to the M3 Cityringen) from Havneholmen to the terminus at Ny Ellebjerg.
Expected to open in 2024, the new US$566m M4 Sydhavn extension is part of a line that will link through to the inner city and ends in the Nordhavn extension.
