Germany – Construction work – Stadtentwässerung Hannover - Zentralgebäude Kläranlage Hannover-Herrenhausen - Generalunternehmerleistungen

For the improvement of the infrastructure of the state capital of Hannover, Stadtentwässerung Hannover plans the new construction of the central building of the Hannover-Herrenhausen sewage treatment plant. Stadtentwässerung Hannover operates the Hannover-Herrenhausen sewage treatment plant, Dunenweg 20, in Hannover Herrenhausen with a current capacity for 500,000 inhabitants. The sewage treatment plant consists of a mechanical plant section, a central section and a biological plant section, which are all spatially separated from one another. The entire sewage treatment plant is in a conversion phase, during which numerous renovations and expansions are planned in the coming years. One part of the planned conversion measure is the new construction of the central building of the Hannover-Herrenhausen sewage treatment plant. The current operating building with workshops and storage, water treatment and parking spaces is located in the central section of the Hannover-Herrenhausen sewage treatment plant. The central building is over 40 years old, no longer meets today's requirements in many respects and is in need of renovation. An expansion of the existing central building is not planned. For the new construction of the operating building, a plot of land on the biological section of the sewage treatment plant west of the Leine between the access road to the north and the railway line to the south has been determined. The new construction of the central building consists of two partial buildings, the 5-storey social building and the single-storey workshop building. GFA - Gross floor area Social building: GFA 4,753 m², GFS 25 m² Workshop building: GFA 2,852 m², GFS 419 m² Total: GFA 7,605 m², GFS 444 m² NFA - Net floor area Social building: NFA 2,398 m² Workshop building: NFA 2,374 m² Total: NFA 4,772 m² The following uses are planned in the social building: - Kitchen for the preparation of approx. 50 meals per day including storage and social rooms - Dining hall for 100 people - Seminar/training room - Changing and shower areas black/white for 130 people - Office/Administration - Technical areas The workshop building comprises the following uses: - Workshop maintenance and operation (W1) - Workshop technical occupational safety (W2) - Mechanic/measurement, control and regulation workshop (W3) - Locksmith's workshop (W4) - Electrical workshop (W5) - Training workshop (W6) - Office and ancillary areas assigned to the individual workshops The new building is positioned parallel to the railway line to the south. Due to the narrow and very long plot of land, the individual workshops are lined up in a 120 m long single-storey hall. To the east, a 5-storey head building with canteen, kitchen, changing rooms, offices and technical control centre adjoins. Coming from the east via the bridge, the head building is already visible from afar as the address for the biological part of the sewage treatment plant. The canteen, as the most lively and publicly effective area, is immediately recognisable with its three-sided glazed facades for the arriving visitor. Under the folded roof, halls and head building are combined into an architectural unit. To the north, towards the access road, the workshop halls recede under the folded roof. The folded roof serves here as weather protection for the building entrances and access roads. All delivery areas (workshops, kitchen) are arranged on one level and are accessed from the north. Stadtentwässerung wishes to build in an environmentally friendly and sustainable manner as a public utility. The basis for the preliminary planning is therefore the concept of the timber-hybrid construction method, in which concrete components such as ceilings, walls and substructures are largely replaced by timber components or the proportion of concrete components is minimised. The timber-hybrid construction method is also to be reflected externally in the facade material. The building will therefore have a vertical timber cladding. A narrow concrete plinth serves as weather protection for the timber facade. The building is located in the landscape of the Leinemasch. The choice of the natural facade material wood and the shape of the folded and planted roof (roof landscape) support the integration of the building into this landscape. It is intended to award the contract within the framework of a general contractor contract. Within the framework of the general contractor contract, the necessary construction services are to be provided by one company.