REAR ANCHORAGE STEEL PILE WALL WITH MICRO PILE FOUNDATIONS
Categorie: References
REINFORCEMENT OF AN ARMOURED STEEL PILE WALL WITH MICROPILE FOUNDATIONS IN SCHWELGERN HARBOUR
Schwelgern is a works harbour in the north of Duisburg. Some of its embankments were in need of repair and were no longer able to withstand the increased demands placed on them. On the north bank, an armoured steel sheet pile wall was to be placed in front of the existing bank wall over a length of around 400 metres and anchored back at predetermined points. In addition to the complete technical machining, the planning of logistics and construction site operations was also in our hands.
At this project, there was a high degree of prefabrication - for example, the factory-made attachment of impact protection plates and ladder and bollard devices. The baseplates for the intended anchor elements were already welded in the factory.
Finally, more than 70 heavy-duty transporters delivered the sheet piles. Each week, an excavator leader working on a pontoon vibrated approximately 30 elements into the ground from the waterside. Filtering cartridge technology was used to drive the sheet piles up to one metre before reaching the statically determined embedment. Afterwards, a fast impact hammer without flushing hammered them down to the final depths.
As the sheet pile wall was being constructed, we used special fitted planks to compensate for dimensional tolerances. In addition, the inserted planks were backed with a waler. These walers serve as load distribution beams in the longitudinal direction; they also contribute to the alignment of the structure.
The completed sheet pile wall was anchored back to the building ground with micropiles. Our terra ASF Micropile was used for this application. This is a micropile system according to DIN EN 14199 that we developed as a tension and pressure pile. The system is a further development of existing micropile systems, characterised by particularly high internal bearing capacities and reserves, as well as great robustness and low deformations. Thanks to precise preliminary planning, all the works went smoothly together.