Stralsund
Hansakai
Stralsund, Germany / 08.2021 - 08.2022
Stralsund’s Northern Harbour Island lies between the historic harbour, brick warehouses and the Strelasund. This is where the history of the Hanseatic city, the harbour’s maritime infrastructure and modern development concepts converge. Overlooking the Ozeaneum, the Gorch Fock I and the old town, the Hansakai has been extensively refurbished and redesigned. For the foundation and stabilisation works along the water’s edge, PORR special civil engineering Berlin was awarded the contract to install micro piles for the rear anchoring of the new sheet pile walls, as well as for the foundations of lattice masts and a new staircase. PORR Equipment Services supported the project with equipment and fleet management.
Facts & Figures
Company
PORR Spezialtiefbau GmbH
Type
Rehabilitation
Runtime
08.2021 - 08.2022
Micro piles are securing the new quay at Hansakai in Stralsund
A new look for the Northern Harbour Island
The Northern Harbour Island was artificially reclaimed in the 19th century and developed over many decades into a major harbour and industrial site. Even today, historic warehouse buildings, quays and maritime infrastructure characterise the appearance of the area. The rehabilitation of the Hansakai involved the renewal of traffic areas and quay edges. At the same time, new recreational areas were created along the waterfront, providing access to the harbour area and views of the Strelasund.
Micro piles for the quay edge and staircase
PORR special civil engineering installed vertical grouted piles to provide the foundations for the staircase as well as two new lattice masts. The new sheet pile wall was anchored using a total of 63 inclined piles. In total, around 2,600 running metres of micro piles with lengths of up to 33.5 m were installed. GEWI® and GEWI®-Plus steel members with diameters of 50 mm and 63.5 mm respectively were used. The piles transfer the load from the structures whilst simultaneously securing the new quay structure along the water’s edge.
Work between the harbour, the water and existing structures
The construction work took place in the immediate vicinity of the water and within a heavily frequented harbour and tourist area. Micro piles were used for the work, which were tailored to the site conditions as well as the requirements of the quay. The work was carried out amongst existing buildings, port infrastructure and the future recreational areas along the waterfront. In addition to the foundations for the new structures, this also laid the groundwork for the renewal of the quay edge.
Hansakai with a maritime character
As part of the redevelopment, two new steel lattice towers with viewing and lighting platforms were erected. They draw on the site’s industrial history and will in future define the appearance of the Hansakai. The new staircase connects the quay to the water’s edge and offers a view across the Strelasund to the island of Rügen. This has created new recreational areas along the refurbished harbour edge, situated between the water, the city and the harbour.
The foundation for the new harbourfront
Even before the redesigned open spaces came to define the appearance of the Hansakai, their foundations were laid deep beneath the surface. The installation of the micro piles laid the groundwork for the renewal of the quay. Between the historic harbour complex, the Strelasund and the Baltic Sea coast, this marked the completion of a further phase in Stralsund’s harbour development.
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