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Bremerhaven, Germany

The grounds of the Naval Operations School between the bends in the River Geeste in Bremerhaven extend right up to the riverbanks on the northern, southern and western sides. After 80 years the sheet piling on the southern and western banks has become so badly corroded that repairing the wall would be uneconomic. Permission for the construction of a replacement wall was granted in February 2011. This article describes the boundary conditions for the design and construction work, especially the influence of the soft soils and groundwater situation so typical of this locality. The only answer to the abrupt change in level between the school grounds and the river is a heavyweight, combined sheet pile structure with piles up to 33 m long. Despite this, at most only the top 7.60 m of the wall is visible. The article also looks at the restrictions on site noise emissions laid down by the authorities. © 2013 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin. Source

Scholz A.,Bremenports GmbH and Co. KG | Pabst C.,Bremenports GmbH and Co. KG | Spekker H.,Projektleiter Inros Lackner AG
Wasser und Abfall

In Bremen and Lower Saxony, the state protective dikes, quays and harbor facilities are being raised and reinforced for future flooding occurrences. Because the dike systems are not only for the utilization of flood control, but also a variety of other requirements, there are always new technical issues, which will be explained based on construction projects. Source

Tesch A.,Planungsburo Tesch WBNL | Marchand M.,KuFOG GmbH | Ebert C.,Bremenports GmbH and Co. KG | Wellm H.,Bremenports GmbH and Co. KG
Naturschutz und Landschaftsplanung

The restoration of tide-influenced foreshores in estuaries can require compensation measures in the inland in order to balance the loss of grasslands by shifting biotope functions to another location. The study summarises experiences how to establish temporarily flooded grasslands in the marsh, particularly in view of bird protection. It bases on efficiency reviews of comprehensive compensation schemes along the lower Weser River over at least ten years. The results are compared to the changes on the restored foreshores. Finally the study draws general conclusions for nature conservation measures along lower courses of rivers. © 2010 Verlag Eugen Ulmer. Source

Qiu G.,University of Management and Technology | Grabe J.,University of Management and Technology | Kukolka N.,Bremenports GmbH and Co. KG | Vollstedt H.-W.,Bremenports GmbH and Co. KG
Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE

New Jack-up ships are built to transport offshore wind turbines from harbor and assemble them with the help of cranes on the ship at the site of installation. Every ship has four stilts, which can be lowered to seabed and jack the ship up. However, penetration and extraction the stilts at the harbor area could jeopardize the existing quay wall construction. In this paper two conceptual designs of foundations, which are used to improve the strength of the seabed in front of the quay wall, are investigated using numerical methods. Through soil exchange in openended cylinder or bucket foundation the strength of the seabed should be improved so that jack-up ships can dock directly at the quay wall and lower the stilts into the foundations. Three dimensional finite element analysis using a coupled Eulerian- Lagrangian method (CEL) are carried out to simulate penetration and extraction process. A hypoplastic constitutive model and the Mohr-Coulomb constitutive model are used to describe the filling. The studies of influences of geometry of foundations as well as the soil parameters on the bearing capacity of stilts and failure mechanism in foundations are carried out as the design basis of the foundations. Copyright © 2011 by ASME. Source

Qiu G.,University of Management and Technology | Hamann T.,University of Management and Technology | Grabe J.,University of Management and Technology | Hein C.,Bremenports GmbH and Co. KG | Howe R.,Bremenports GmbH and Co. KG
Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE

Jackup ships are built to transport wind turbines foundation between offshore logistics center and the installation site. It require sufficiently stable seabed next to quay walls. Otherwise jackup processes may reduce the stability of the quay wall and remained footprints of the legs could induce unsafe jackup procedures in the future. Foundations have been planned to improve the strength of seabed in front of the quay wall. The numerical analyses of the penetration/extraction processes of the legs into/out of the foundations were presented in OMAE2011-49928 to study the bearing capacity of two foundation designs (open-ended cylinder and bucket foundation). In consequence of the numerical studies, the bucket foundation was selected and was improved by reduction the height of the foundations and adjust the inclination of the inner wall to reduce the construction costs. Four bucket foundations have been built in Bremerhaven, Germany. This paper provided of a resume of design, construction and set-up process. The penetration and extraction processes of the jackup legs were tested the results were compared with the numerical predictions. Copyright © 2013 by ASME. Source

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