In order for the project to be a success, the building ground must be improved along the 2675-metre long coast. For this purpose Keller is compacting more than 7 million cubic metres of sand in an area of 380,000 m². Through deep compaction, the load-bearing capacity of the ground to support construction loads is enhanced and the settlement of the ground is reduced. For the current harbour project, the company is using a duty cycle crawler crane from the Liebherr HS series. The HS 8130 is equipped with a vibro-flot for deep compaction.
The long boom of the HS 8130 provides Keller with a large working radius. Without having to change the position of the duty cycle crawler crane, a wide radius of building ground can be compacted. The radius is a particular advantage for the steep drop into the sea. Work of this kind is usually carried out from a barge. Or land is temporarily reclaimed for the task and subsequently restored to the sea. Both these methods are considerably more time-consuming and cost-intensive. Thanks to the deep compaction using the HS 8130, Keller improves the building ground down to a depth of 19 m. The aim is to withstand a construction load of 200 kPa. In order to verify the geo-technical requirements of the ground, approximately 600 compaction points are being tested using SPT (Standard Penetration Test). In addition to the large radius of the HS 8130, the complete HS series has proven itself through its all-rounder qualities.