Germany – Engineering design services – Planungsleistungen für den Ersatzneubau des Auedeichsiels und die Erhöhung des Deichabschnittes Dkm 19-200 bis Dkm 19-300

Since a decision by the Hamburg Senate, new reference water levels for public flood protection facilities in Hamburg have applied since 2012, which has necessitated the adjustment of all flood protection facilities. As part of the flood protection construction program, the Hamburg main dike line is to be successively strengthened by 2050. In the southeast of Finkenwerder, there is the 1,441 m long Aue main dike, which is designed as a foundation dike. This is to be raised by 0.90 m to a target height of NHN +8.60 m. During the planning for the dike raise, it was determined that future climate changes and the associated changing water levels should be taken into account in order to be able to implement a subsequent raise of the Aue main dike as easily and sustainably as possible. For this purpose, a 2nd expansion stage with the planning horizon 2100 has been determined. The target height of the dike for the 2nd expansion stage has been set to NHN +9.40 m. The Aue main dike is divided into 5 sections (North 1.1, Auedeichsiel 1.2, Middle 2, Storchennest 3.1 and South 3.2) due to installations and different cross-sections. The Auedeichsiel crosses the Aue main dike at Dkm 19+252. It is approximately 90 m long, approximately 1.8 m wide and approximately 2.3 m high. Essentially, the structure consists of a single-track culvert, the inlet and outlet structure and an operating building with an operating shaft. The culvert is a box-shaped steel-reinforced concrete frame structure from 1968. The ceiling slab is concave. The culvert consists of individual building blocks, which are connected on the pressure water side by a joint construction. One culvert block was not renewed in 1968 and still exists from 1393/45. The culvert is founded on a preserved base plate from 1939/45 and the existing timber pile foundation from 1939/45. It drains the Auedeichgraben and the Ringgraben into the Finkenwerder Vorhafen and is thus a structure of water management. In the event of rising Elbe water levels, the stop gate closes and protects the hinterland from increased water levels. The second dike safety is ensured via a lifting gate. During the planning for the raising of the Aue main dike, it was found that the Auedeichsiel does not have any additional calculated load-bearing reserves in the culvert cross-section and in the foundation. For this reason, it is not possible to construct the intersection structure with a raised dike. A replacement new construction must be planned for the Auedeichsiel. The replacement new construction is to be integrated into the current raising measure in terms of planning. There is a current hydraulic-water management requirement planning for the Auedeichsiel, from which the dimensioning for the replacement new construction can be derived. In addition, the dismantling of the existing culvert and the maintenance of the culvert operation during the construction period must be planned. The location of the new Auedeichsiel will be determined as part of the planning service of the object and structural planning, inter alia, taking into account the existing structures, the recommendations of the ordnance survey planning, environmental-specific concerns and area availability. The dike planning in the area of the Auedeichsiel, taking into account both expansion stages and the planning adjacent to the north and south (section 1.1 and section 2), is also the subject of this planning task. During the construction of the Auedeichsiel, traffic on the Aue-Hauptdeich road and the intersecting cycle/pedestrian paths is to be maintained as far as possible. Building Information Modeling (BIM) is to be applied in this project. As part of the planning process, measures for climate-optimized construction in the areas of design (variants), choice of building materials, delivery transports, construction site logistics and processes are to be identified and evaluated. The contractual obligations of the contractor comprise the services of - structural design of civil engineering structures in phases 1 to 7 according to §43 HOAI - structural design for phases 1 to 6 according to §51 HOAI - technical equipment for phases 1 to 3 and 5 to 7 according to §55 HOAI, each for the system group 4, the system group 7.2 and the system group 8 - geotechnical calculations.