Detachable fluidisation device

A detachable fluidisation device for use in a vertical positioned tubular foundation pile having a pile axis and comprising a central element and radially extending fixing means;

• wherein the radially extending fixing means can have a first position wherein, in use, the central element is radially fixed to the interior of the tubular foundation pile and a second position which allows the fluidisation device to axially move along the length of the tubular foundation pile;
• wherein the central element has at its lower end, when the detachable fluidisation device is in its orientation of use, a rotating lower end which in use can rotate in a direction of rotation along the pile axis;
• wherein the rotating lower end is provided with horizontally extending arms, which arms are each provided with high pressure water injection nozzles and with mechanical cutting elements extending from the arm in the direction of rotation;
• wherein the high pressure water injection nozzles are rotating nozzles;
• and
• wherein the rotating nozzle comprises a non-rotating fixed part and a rotating nozzle head as present in a nozzle head chamber,
• wherein the rotating nozzle head has an upper and lower end,
• wherein the nozzle head chamber has a wall defining the chamber and an opening at its lower end, the opening has sides, and the wall of the nozzle head chamber has one or more openings for discharging a water jet into the nozzle head chamber,
• wherein the lower end of the rotating nozzle head is present in the opening of the nozzle head chamber such that a sleeve opening between rotating nozzle head and the sides of the opening of the nozzle head chamber remains,
• wherein the non-rotating part is provided with an inlet for pressurised water and a conduit for passage of pressurised water to an inlet for pressurised water as present at the upper end of the rotating nozzle head, said inlet for water being fluidly connected to one or more nozzle outlets as present at the lower end of the rotating nozzle head from which in use a jet is ejected, and
• wherein the rotating nozzle head is further provided with a horizontal water wheel having a vertical axis of rotation at its upper end which is functionally aligned with the one or more openings for discharging a water jet into the nozzle head chamber such that a rotation of the rotating nozzle head results.