Redesign of Hansakai on the northern harbor island of Stralsund, lot 7

The construction project "Redesign of Hansakai on the northern harbor island of Stralsund, lot 7" is a central component of the urban renewal of the harbor island in Stralsund. The eastern area of Hansakai was extensively renovated and redesigned between March 2022 and May 2023. The client was Stadterneuerungsgesellschaft Stralsund mbH, while Ed. Züblin AG, Engineering and Port Construction Division of the Northern Directorate, was responsible for the construction work. The project volume amounted to EUR 3.2 million. The main aim of the project was to restore the structural safety of the shoreline edges, improve the functionality of the open spaces and enhance their design. At the same time, infrastructural modernizations were implemented, which included supply lines as well as high-voltage systems and lighting.

The measure was closely linked to hydraulic engineering work, in particular the renewal of the sheet piling at the neighbouring berth 6. The design concept developed in advance defined both functional requirements and design standards to ensure harmonious integration into the overall appearance of the harbour island.
Implementation focused on two central construction areas: construction area A1 at the water stairs with a focus on concrete construction and construction area A2 around the pilot house and the slipway. Various main services were carried out within these areas. These included the demolition of 15 m³ of concrete and reinforced concrete, an excavation of 180 m³ and the construction of a 335 m long drainage trench. A total of 450 m³ of concrete foundations and 140 tons of reinforcing steel were used. In addition, 385 m³ of gravel base layers were created, a 1,220 m² drainage mat was installed and 335 m of drainage channels with grid elements were installed. A significant part of the work involved setting a total of 508 precast concrete elements, including platforms, seating steps as well as footpaths and block steps. The area worked on in this way was around 2,100 m² and has a significant impact on the appearance of the Hansakai.

The construction work was characterized by several special challenges. Firstly, parts of the work area were located in a flood hazard zone, which necessitated increased safety requirements and specific construction scheduling. In addition, high demands were placed on fair-faced concrete surfaces in order to achieve the sophisticated overall appearance of the quay. In some cases, manual excavation work was required for the construction of the pylon foundations, as the local conditions meant that the use of machines was only possible to a limited extent. In addition, various special constructions were used, such as special drainage channels or handrails made of V4A stainless steel, which offer particular corrosion resistance.

The construction method was mainly based on prefabricated parts and system construction and was supplemented by earthmoving and shallow foundations. The combination of technically demanding precast concrete work and complete port and hydraulic engineering services placed high demands on planning and construction management. In addition to the client and the executing unit Züblin, AIU Stralsund GmbH as planner and internal managers such as Sebastian Geldschläger (costing) and Ralf Mertz (group management) were also significantly involved.
The completion of the refurbishment created a modern, functional and aesthetically pleasing port area. The measure makes a sustainable contribution to Stralsund's urban development, improves the infrastructure and at the same time enhances the quality of the Hansakai.