JV Hochtief-Implenia

JV Hochtief-Implenia is a project-based joint venture between HOCHTIEF and Implenia that delivers complex underground infrastructure for rail and electricity networks in Europe. The partners typically hold equal 50/50 stakes, combining HOCHTIEF’s and Implenia’s experience in tunnelling, special foundations and large-scale civil engineering. The consortium structure is applied flexibly: on the Marienhof joint venture for Munich’s Second Core S‑Bahn Route, Implenia acts as technical lead while HOCHTIEF provides commercial leadership, whereas on the Tunnel Ostbahnhof joint venture for the same rail corridor those roles are reversed. In Sweden, the JV (branded locally as JV Hochtief Implenia) is the main contractor for the Anneberg‑Skanstull tunnel, a 14 km, 5 m diameter electricity tunnel for Svenska Kraftnät that forms the second of four phases in the City Link project to reinforce Stockholm’s power supply. In Munich, the JV is responsible for key sections of Deutsche Bahn’s Second Core S‑Bahn Route, an approximately 11 km largely underground line designed to relieve the existing east‑west tunnel, which carries more than 840,000 passengers per day. The Marienhof JV is building the deep‑level central station beneath the city centre, including complex special foundation and tunnel works beneath existing metro lines. The Tunnel Ostbahnhof JV is constructing two main traffic tunnels, a rescue gallery, the underground München‑Ost station, a new track underpass and multiple connecting structures and shafts over roughly three kilometres between Marienhof and Ostbahnhof, using BIM and Lean methods to manage construction under live rail operations. On selected projects, such as Marienhof, the JV also pilots low‑emission construction solutions, including fully electric excavation equipment, contributing to the decarbonisation targets pursued by both parent companies.