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Rock Crusher WRC 240i Speeds up Recycling Project for New Trailer Port in Germany
At the Dresden-Friedrichstadt port facilities, in Germany, the state-of-the-art TrailerPort being built for rail-road transshipment requires a particularly stable, high-quality cement-treated base layer. This is why a Wirtgen Rock Crusher WRC 240i was chosen for the job. As the port has been rebuilt many times in its 130-year history, the ground on the site was interspersed with brick, stone, and the remains of foundations with edge lengths of up to 250 mm from the demolition of the old buildings and infrastructure. The contracted construction company opted for in-situ processing of the ground. A WRC 240i Rock Crusher was deployed to crush and homogenize the ground material on the 12,000 m² site. This meant that the existing material could be re-used in an extremely resource-friendly way and had the added benefit of eliminating the need for transporting materials to and from the site – saving more than 1,000 truckloads in all.
A crawler dozer spread the material evenly in the desired subgrade. A Streumaster SW 16 MC spread 80 kg/m² of cement mix in 2 passes and the layer was subsequently mixed in homogeneously by a Soil Stabilizer WR 250i. The Wirtgen WR was followed by a soil compactor for pre-compaction, a Grader for producing the fine subgrade, and a smooth drum roller for final compaction. The chosen approach had the advantage of saving transport costs, time, and resources. The recycling of the existing surface pavement and ground material in-place made it possible to realize a sustainable and resource-friendly construction method. The base layer with a thickness of 48 cm was completed within two weeks. Soil replacement would have taken 8 to 14 weeks. However, the use of the Wirtgen WRC 240i made it possible to significantly reduce construction time and eliminated the costs of transporting material to and from the site.
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The Rock Crusher processed the ground material with its crushing and mixing rotor to a depth of 50 cm. At an advance rate of around 8 m/min, it achieved an average productivity of approximately 450 t/h. The HT18 crushing tools shattered the material on the crushing bars, and the screens retained this material in the crushing and mixing chamber until it met the material requirements (grain size: 0/32) and could pass through the 45 mm screen mesh. The homogeneously mixed material that remained behind the WRC was prepared for subsequent stabilization with NovoCrete ST98 cement.
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