Composite structure for a pile foundation for anchoring a tower structure, foundation and jacket for a wind turbine, and wind turbine

Abstract

A composite structure for a pile foundation for anchoring a tower structure (e.g., an offshore wind turbine) in ground, which includes a hollow pile introduced into the ground at an erection site of the tower structure and a corner post which is connected to the tower structure and which, on a connection side, is arranged within the pile. The pile and the corner post are fixedly bonded to one another in a bonding region by a cured bonding material. At least one bonding means for transmitting shear forces is fixedly arranged on the pile and/or on the corner post in the bonding region. The bonding means has at least one aperture which is filled with the bonding material or, together with the corner post or pile, forms the aperture that is filled with the bonding material. The aperture encloses the bonding material by an angular range of 90 or more.

Claims

1. A composite structure for a pile foundation for anchoring a tower structure in ground, comprising: a hollow pile which is introduced into the ground at an erection site of the tower structure; and a corner post which is connected to the tower structure and which, on a connection side, is arranged within the pile; wherein the pile and the corner post are fixedly bonded to one another in a bonding region by a cured bonding material, wherein at least one bonding means for transmitting shear forces is fixedly arranged on the corner post in the bonding region, wherein the at least one bonding means has a longitudinal axis that extends parallel to a longitudinal axis of the corner post, wherein a longitudinal side of the bonding means is fastened to the corner post, wherein a free side of the bonding means opposite to the longitudinal side of the bonding means that is fastened to the corner post includes teeth between which apertures are provided, and wherein the apertures are filled with the bonding material.

2. The composite structure as claimed in claim 1, wherein the bonding means has a radial extent which is greater than a wall thickness of the corner post bearing the bonding means.

3. The composite structure as claimed in claim 1, wherein the bonding means is welded to a corner post circumferential surface facing the pile.

4. The composite structure as claimed in claim 1, wherein the bonding means is formed as a continuous bonding strip.

5. The composite structure as claimed in claim 4, wherein the bonding strip extends substantially in a direction of the longitudinal axis of the corner post.

6. The composite structure as claimed in claim 5, wherein the apertures have a clothoid shape or a puzzle part shape.

7. The composite structure as claimed in claim 4, wherein the bonding strip extends over a substantial part of the bonding region.

8. The composite structure as claimed in claim 4, wherein a plurality of continuous bonding means are arranged circumferentially spaced apart on a corner post circumference.

9. A foundation for a tower structure having a composite structure as claimed in claim 1.

10. A jacket for a wind turbine, having at least one corner post, wherein bonding means according to claim 1 are formed on the corner post.

11. A wind turbine having a jacket as claimed in claim 10.

12. A wind turbine having a foundation as claimed in claim 9.

Description

(1) The invention will be explained in more detail below with reference to exemplary embodiments which are schematically illustrated in the figures, in which:

(2) FIG. 1 shows a sectional view of a first exemplary embodiment of a pile foundation according to the invention with discontinuous bonding means;

(3) FIG. 2 shows a sectional view of a second exemplary embodiment of a pile foundation according to the invention with continuous bonding means;

(4) FIG. 3 shows some examples of discontinuous bonding means; and

(5) FIG. 4 shows some examples of continuous bonding means.

(6) A pile foundation 1 for an offshore wind turbine is illustrated in FIG. 1.

(7) The pile foundation 1 comprises a hollow pile 2. A connection-side end of a corner post 3 is arranged in the hollow pile 2, wherein the depth of penetration of the corner post 3 is limited by what is referred to as a pile stopper 12.

(8) The hollow pile 2 is filled with mortar 4 over its entire represented length, in particular also the overlapping region, designated as bonding region VB, between the pile 2 and the corner post 3. The bonding region VB extends from the upper edge of the pile 2, on which the pile stopper 12 bears, over the entire overlap length of the corner post 3 to the lower tip of the corner post 3. The region of the corner post 3 introduced into the hollow pile 2 is also designated as grout pin 15. In this bonding region VB, various discontinuous bonding means 5, 6, 7, 8, 9, 10 are arranged on the corner post circumference 13. Thus, for example, a headed-bolt dowel 5 is fastened to the corner post 3. The following are also shown: a horseshoe dowel 6 and an angle anchor 7, a block dowel 8 and a T-dowel 9, wherein the angle anchor 7, the block dowel 8 and the T-dowel 9 are additionally provided with anchor loops or hook anchors 10. In addition to these bonding dowels, annular shear ribs 11 are also arranged on the hollow pile inner surface 14, via which shear ribs shear forces are dissipated into the pile 2. Other than shown in FIG. 1, only one type of dowel is generally provided for the practical implementation of the invention. FIG. 1, and in particular also FIG. 3, are intended to show that there are a multiplicity of suitable dowel types. Bonding dowels have already long been used, for example for reinforced concrete bridge construction. A description of corresponding discontinuous and continuous dowels with further references is described, for example, in the dissertation Zum Trag- und Verformungsverhalten von Verbundtrgern aus ultrahochfestem Beton mit Verbundleisten [The load-bearing and deformation behavior of composite beams of ultra-high-strength concrete with bonding strips], faculty of civil engineering of RWTH Aachen by Mrs Sabine Heinemeyer.

(9) An alternative pile foundation 20 for an offshore wind turbine is illustrated in FIG. 2.

(10) The pile foundation 20 also comprises a hollow pile 22 into which there projects a corner post 23, again limited by a pile stopper 32 which comes to bear on the upper pile edge. As was also already the case in the first exemplary embodiment of FIG. 1, in this second exemplary embodiment the hollow pile 22 is also filled with mortar 24 over its entire represented length, in particular thus also the space between the pile 22 and the corner post 23. Load transmission substantially takes place in the bonding region VB which corresponds to the overlapping region between the corner post 23 and hollow pile 22.

(11) In the second exemplary embodiment illustrated in FIG. 2, instead of the discontinuous bonding means from FIG. 1, a plurality of continuous bonding means 25 are now arranged on the corner post circumference 33, for example four bonding strips offset circumferentially by 90. Furthermore, shear ribs 31 are arranged as additional bonding means on the hollow pile inner surface 34 facing the corner post 23. However, it would also be conceivable, instead of or in addition to the shear ribs 31, for one or more discontinuous and/or continuous bonding means to be arranged on the hollow pile inner surface 34.

(12) The continuous bonding means 25 fastened to the corner post 23 are designed as strips whose longitudinal axis extends parallel to the longitudinal axis of the corner post 23. A longitudinal side of the bonding strip 25 is welded to the corner post 23, and the free longitudinal side opposite to the welded side has apertures 26 between teeth 27.

(13) In the exemplary embodiment illustrated, the apertures 26 have a clothoid design. However, alternative aperture shapes are also conceivable, such as, for example, puzzle-shaped, dovetail-shaped or else droplet-shaped apertures. Further examples of suitable bonding strips are illustrated in FIG. 4.

(14) FIG. 3 shows some non-exhaustive examples of discontinuous bonding means, namely from top left to bottom right:

(15) 1st line: headed-bolt dowel;

(16) 2nd line: in perspective view, block dowel with anchor loop, T-dowel with hook anchor, C-dowel with anchor loop, horseshoe dowel with anchor loop;

(17) 3rd line: block dowel with hook anchor in plan view and side view, block dowel with anchor loop in plan view and side view, angle anchor with hook anchor in perspective view.

(18) FIG. 4 shows some non-exhaustive examples of discontinuous bonding means, namely from top left to bottom right:

(19) 1st line: perfobond strip, combination dowel strip (perfobond strip with further edge apertures);

(20) 2nd line: sawtooth strip, puzzle strip;

(21) 3rd line: in each case welded on a double-T-beam, a perfobond strip, a curvy perfobond strip, a T-connector, a curvy bonding strip;

(22) 4th line: the figures show example profiles of apertures 26/teeth 27 of different bonding strips 25.