Port of Straubing Sand, Straubing
Straubing, Germany / 09.2022 - 10.2023
As part of the Danube expansion between Straubing and Vilshofen, the harbour basin in the port of Straubing-Sand is being deepened. On behalf of the Zweckverband Hafen Straubing-Sand (Straubing-Sand Port Association), the Stuttgart-based Stump-Franki subsidiary realised Lot 1, which comprises the reinforcement of the existing sheet pile walls with 1076 permanent grouted anchors. The German Sustainable Building Council (DGNB) awarded Stump-Franki the pre-certificate "Sustainable Construction Site - Special Civil Engineering" for its very good performance in the areas of construction site organisation, resource protection, health & social issues and quality of construction.
The Danube expansion between Straubing and Vilshofen is a long-planned decade-long project that pursues two main goals. On the one hand, the flood protection level is to be raised from an approximately 30-year flood to a 100-year flood. Secondly, navigation conditions on the important federal waterway will be improved. Among other things, the draught at low water will be increased by at least 20 cm, between the Straubing lock and the port of Straubing Sand even by 65 cm. Since the existing sheet pile walls are subjected to considerably more static stress due to the deepening of the harbour bottom, a reinforcement of the sheet pile walls is necessary before dredging.
Facts & Figures
Company
Stump-Franki Spezialtiefbau GmbH
Type
Foundations
Runtime
09.2022 - 10.2023
Permanent anchors secure the statics of the sheet pile walls
The additional anchor layer consists of 1076 grouted permanent anchors spaced at 1.0 m intervals. The lengths vary between about 18.50 m and 29 m, the anchor steel diameters are 40 mm, 50 mm and 63.5 mm. As the anchor heads are each located in the sheet pile valley, waling is not required.
High demands on nature conservation and deadline security
In order to disrupt port operations as little as possible, the anchors were produced exclusively from a 42 x 12 m work pontoon. The required material was lifted by crane from an intermediate storage area on land onto a supply pontoon, which was then moved next to the work pontoon. In order to guarantee deadlines and to achieve a high daily output, work was carried out in two shifts at times. The requirements for environmental protection and nature conservation as well as timely completion are also high. For example, no substances are allowed to get into the Danube water. The drilling material is collected in rubble troughs, brought ashore by supply pontoon and disposed of properly. As the harbour area is partly located in a bird sanctuary, the noise and sound-intensive work in these areas had to be completed by the beginning of the official breeding season on 1 March 2023.
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