VDW Technique
 

The VDW technique is a well-engineered and mature process primarily for the vibration-free installation of bored pile retaining walls for deep excavations immediately adjacent to existing  buildings. It facilitates the maximisation of the excavation’s usable floor area.

The leader rigs of the RG series are ideally suited as base
machines for the VDW technique due to their versatile and
compact construction and their high-powered system.
  VDW