Two oscillation units per drum
In the split oscillation drum from HAMM, one full oscillation unit works in each half. These two units are mechanically independent of each other. To ensure that the two drum halves always vibrate synchronously, despite their different rotation speeds around corners, HAMM has integrated an electrohydraulic control. This adapts the position of the unbalanced mass quickly and precisely to the position of the two drum halves. It is precisely this that is decisive for the high quality of the compaction because, in this way, shear stresses in the asphalt that is to be compacted are minimised. This, in turn, ultimately prevents material displacement and cracks.
Successfully using split oscillation drums
On various construction sites across Central and Northern Europe, customers are already familiar with the advantages of compaction using split oscillation drums. A prime example of using the split oscillation drum was the compaction when laying asphalt in the roundabout at a junction on autobahn A 7 in Northern Germany: "Despite the extremely tight radii, the DV+ 90i VS-OS created a crack-free and, therefore, high-quality surface for the roundabout," confirms building contractor Ferdinand Kalinowsky from Ewald Kalinowsky GmbH & Co. KG in Bad Beverstedt. These experiences were also confirmed by Arnold Rijper from BAM Infra in the Netherlands: "Using the split oscillation drum, we have achieved outstanding compaction results within a short time. The drum particularly impressed us when compacting in curves." A significant advantage of oscillation is the rapid increase in compaction. In practice, this means that compaction with oscillation is quick and is therefore extremely economical. When using the split oscillation drum, this feature is now combined with the increase in quality during compaction in curves and for every steering movement.