Abstract: An arrangement for installing building elements, such as piles and tunnel sections, into a ground formation, where a building element is provided. Two or more impact drivers for delivering blows to the element are mounted on or operatively connected to the element. Accordingly, large elements, such as monopiles for wind turbines, which may comprise a steel tube having a diameter in excess of 5 meters, or even tunnel sections, can be installed by utilizing a number of relatively small impact drivers.

Abstract: The invention pertains to a driver (1) for installing foundation elements, such as anchors or piles, in a ground formation and preferably in submerged condition, comprising a housing for accommodating and guiding a weight, an element for mounting the driver (1) on or in the foundation element, one or more chambers for holding a charge or one or more connectors for connecting the driver (1) to a source of a high pressure gas, and corresponding conduits allowing a high pressure gas to flow from the chamber(s) or connector(s) to below the weight. The housing is adapted to allow a stroke of the weight having a length such that, during upward movement of the weight the pressure of the gas drops to a value, which will cause the weight to decelerate.