Start of construction for Hamburg’s longest “mountain trail” of its kind
Around 300 meters long and, at 422 tons, as heavy as 8 HVV subway railcars
– on a lushly planted public “mountain path,” Hamburg residents will soon be hiking high up to their city garden on the St. Pauli bunker. Work on the impressive structure has now begun with the assembly of the first of a total of 24 steel support arms. “Another important milestone on the way to the green bunker,” says the responsible project manager Paul Hahnert from EHP Erste Hamburger Projektmanagement GmbH about the next construction phase.
Each of the steel support arms, which are fastened to the outer facade with several threaded rods, each two to three meters long, weighs around 5.5 tons alone. The ground foundation of the later path is formed, among other things, by approx. 20 cm high prestressed concrete slabs with a further 24 cm high superstructure. On top of this, in turn, the substrate for the greening will be applied.
After completion of the mountain path, the five-meter-wide ascent, lined by a railing, starts at ground level on the north side of the “green bunker”. Freely accessible to all, it leads up the east, south and west facades, offering imposing panoramic views in all directions as it climbs. Finally, at a height of 58 meters, the path ends in Hamburg’s largest public roof garden. Around 4,700 trees, shrubs, hedges and climbing plants from the von Ehren tree nursery are planned for this imposing natural oasis. They already reach impressive sizes of up to 5 meters and are ready to be transported to the bunker roof.
The addition of five pyramid-like floors to the elevated bunker at Heiligengeistfeld and the creation of the “hanging gardens of Hamburg” are considered unique. The “Süddeutsche Zeitung”, for example, considers the pioneering landscape architecture project to be in a “top position among the world’s attractions” in the “series of spectacular green buildings”.
Text/Photo: Frank Schulze Kommunikation