METHOD AND DEVICE TO CREATE A FOUNDATION AS WELL AS A FOUNDATION

Abstract

A method and a device to create a foundation in which a foundation pipe is driven into the soil. At least one bore is created into the soil in the perimeter area of the foundation pipe to insert before ramming by means of a drilling tool the diameter of which is significantly smaller than a diameter of the foundation pile. The soil material removed during drilling remains essentially within the bore. Furthermore, a foundation with a foundation pipe which is created accordingly.

Claims

1.-15. (canceled)

16. Method to create a foundation in which a foundation pipe is driven into a soil, wherein that before the driving-in by means of a drilling tool the diameter of which is significantly smaller than a diameter of the foundation pipe at least one bore is created into the soil in the perimeter area of the foundation pipe to insert, and that the soil material removed during drilling remains essentially in the bore.

17. Method according to claim 16, wherein that several bores are created which are arranged circularly in the soil along the perimeter area of the foundation pipe to insert.

18. Method according to claim 17, wherein that the bores are arranged in a touching or overlapping manner.

19. Method according to claim 17, wherein that adjacent bores are created with a distance to each other whereby a soil segment remains between the adjacent bores.

20. Method according to claim 16, wherein that the at least one bore is deepened up to a drill depth which is less than or is the same as the ramming depth of the foundation pipe.

21. Method according to claim 16, wherein that the foundation pipe is driven into the soil by means of a ramming device which is designed either as percussive drive hammer or an oscillating vibrator.

22. Method according to claim 16, wherein that the foundation pipe is driven into the soil of a body of water to create an underwater foundation.

23. Method according to claim 22, wherein that the drilling tool is driven rotationally by a drilling device which can be moved on the working platform along the perimeter of the foundation pipe to insert.

24. Method according claim 23, wherein that the work platform floats on the surface of the body of water or is lowered to the ground of the body of water.

25. Method according to claim 23, wherein that at the work platform is provided at least one circular drill guide which has guidance devices for the drilling tool according to the positions of the bores to insert.

26. Method according to claim 16, wherein that during the drawing back of the drilling tool from the soil fill material, in particular a hardenable material, is fed to the bore.

27. Foundation with a foundation pipe which is driven into a soil, in particularly according to a method according to claim 16, wherein that at least one bore is inserted into the soil in the perimeter area of the foundation pipe before the driving-in, the bore diameter of which is significantly smaller than a diameter of the foundation pipe and that the at least one bore is filled with soil material which accumulates during creating the bore.

28. Device to create a foundation with a foundation pipe into the soil, in particularly to carry out a method according to claim 16 with a working platform including a ramming device to drive the foundation pipe into the soil, wherein that on the work platform is provided a drilling device with drilling tool, the drill diameter of which is significantly smaller than a diameter of the foundation pipe to install, and that the drilling device can be moved along a perimeter area of the foundation pipe to drive in.

29. Device according to claim 28, wherein that the working platform to create an underwater foundation is designed floatable and/or lowerable.

30. Device according to claim 28, wherein that the drill device has a pipe-shaped drilling tool via which pipe interior fill material can be introduced into the bore.

Description

[0029] Subsequent the invention is further described by preferred exemplary embodiments which are depicted schematically in the drawings. The drawings show in:

[0030] FIG. 1 a schematic perspective view of a device according to the invention when constructing a foundation according to the invention; and

[0031] FIG. 2 a schematic top view of an inserted foundation pipe according to the invention.

[0032] According to FIG. 1 the creating of a foundation in the soil 3 of a body of water 4 is depicted. A device 10 according to the invention with a floatable work platform 12 is initially positioned at the desired position on a surface 6 of the body of water 4. Then four supports 18 are lowered in a basically well-known way at the work platform 12, wherein the supports 18 are anchored in the soil 3 of the body of water 4. Then the work platform 12 can be lifted. The device 10 is used to insert a foundation pipe 1 which can especially be used as a foundation for an offshore wind energy converter. Such foundation pipes 1 have a diameter of several meters, particularly between 5 meter and 10 meter.

[0033] Before the foundation pipe 1 is forced or driven into the soil 3 the soil 3 is loosened circularly in the area of the wall of the foundation pipe 1 by rotary inserting of bores 5. The bores 5 are thereby produced by a drill device 20 through which at the desired positions a drilling tool 22, preferably designed as an auger, is inserted into the soil 3.

[0034] In the depicted exemplary embodiment the drilling device 20 is a traditional mobile drilling rig with a movable undercarriage and an adjustable, especially rotatable upper carriage with mast arranged thereon, along which a drill drive is mounted in a vertically adjustable manner for rotary driving the drilling tool 22. The drilling device 20 can be moved along a flat work surface 13 on the work platform 12 to desired working positions. On the flat work surface 13 a further movable accessory device 40 is shown. This can be used to handle the foundation pipe 1 or the drilling tool 22. Alternatively, as accessory device 40 also a further drilling device can be provided so that basically the drilling work can be carried out twice as fast.

[0035] For an accurate sinking the bores 5, which are schematically shown in FIG. 2, an upper drilling guide 14 to guide the drilling tool 22 is arranged in the upper area along a vertical work transit at the work platform 12. The drill guides 14, 15 are preferably designed as circular drill templates. Within this upper drill guide 14 the ramming device 30, only schematically indicated, can be arranged for driving-in the foundation pipe 1. For an especially exact guiding a lower drill guide 15 with tubular guide mechanisms 16 is arranged. The circular lower drill guide 15 can be sunk from the work platform 12 up to the ground of the body of water 4 by means of hoist ropes 17.

[0036] Alternatively, the ramming device 30 can also be positioned on a separate second working platform. In this case, the first working platform 12 with the drilling device 20 is removed after having created the borings 5 and is replaced by the second working platform with the foundation pipe 1 and the ramming device 30. After a corresponding positioning, the foundation pipe 1 is then driven into the soil 3 in the area of the bores 5.

[0037] In this way, a plurality of bores 5 can be provided circularly along a perimeter of the foundation pipe 1 to drive in for loosening the soil 3. The circular arrangement of the bores 5 is shown schematically in FIG. 2. According to the shown exemplary embodiment eight bores 5 are sunk into the soil 3. The bores 5 are positioned circularly along the perimeter of the foundation pipe 1 to insert so that a wall of the foundation pipe 1 runs in each case approximately centrically through the bores 5. The bores 5 are created in such a way that the soil material removed during drilling remains essentially in the bore 5. Through the bores 5 a distinct loosening of the soil 3 is achieved, in particular in the case of hard soil. This allows successively the foundation pipe 1 to force or to drive into the soil 3 with lesser forces.

[0038] In general the bores 5 can be created in a touching or overlapping manner in a circular arrangement. In the shown exemplary embodiment according to FIG. 2, the bores 5 are designed in a mutually spaced manner wherein one soil segment 7 with not loosened up soil material remains between the bores 5 with loosened up soil material.