The subject matter relates to a set of mold parts for a wind turbine foundation and a wind turbine foundation.

Wind turbines, especially onshore wind turbines, are regularly founded with a concrete foundation. Such a concrete foundation is built on-site as part of engineering work. First, a formwork is built and then filled with concrete and reinforced by rebars to form a reinforced concrete structure. However, the engineering work, formwork and pouring on-site are costly and take a long time. In addition, transporting liquid concrete to the construction site is technically challenging and expensive, especially in impassable terrain. The conditions under which the poured concrete can harden are on-site weather-dependent and thus cannot be standardized, which can lead to different compressive and tensile strengths of the components. In addition, due to the on-site formwork, the dimensional accuracy of the structures is often worse than desired by the designer and necessary for a safe stand.

Due to these disadvantages of on-site construction, the subject matter was based on the object of providing mold parts for a wind turbine foundation as well as a wind turbine foundation which provides great stability with low material input and can be produced with high constructional, in particular dimensional accuracy.

This object is solved by a set of mold parts according to claim 1 and a wind turbine foundation according to claim 15.

A set of mold parts is to be understood as a set, group, plurality or multiplicity of mutually compatible mold parts. A set of mold parts is formed from at least two separate mold parts that can be joined to form a mold part assembly. In this case, at least two separate mold parts of the mold part set can be compatible with each other and can be joined to form a mold part assembly. Joining to build the mold part assembly is preferably carried out by means of a form fit on corresponding joining surfaces of the mold parts. The mold parts can engage in form fit with each other via the respective joining surfaces.

The foundation can be a shallow foundation, slab foundation and/or ground foundation. When the term ground is used, the term shallow or slab is also meant.

The mold parts can be reduced in weight if they have a U-profile cross-section with a base and two side walls. At least two mold parts can be joined to form a mold part assembly. The mold part assembly then has a trough-shaped. A trough base is formed by the base of the mold parts.

The profiling of the parts results in a considerably smaller volume, and therefore a lower weight, compared with a cuboid component. This is of particular interest if the mold parts are to be delivered to the building site as prefabricated components. In addition to the weight advantages, there are also considerable cost advantages, since the mold parts require less building material. Once assembled, the mold parts are trough-shaped. In the assembled, installed state, a trough base may rest on the ground and the side walls may project upwardly, particularly substantially vertically. The base and the walls may be substantially perpendicular to each other. To provide sufficient weight to securely fix the wind turbine, the mold parts in the mold part assembly may be backfilled with excavated material on site. In this case, the excavated material can be backfilled into the trough formed by the mold parts.

In order to join the mold parts into a mold part assembly, in particular such that the joined mold parts in the mold part assembly are trough-shaped, it is proposed that a first mold part has the U-profile in a cross-section and has an L-profile with a lateral leg and a base in a longitudinal section. Also, it is proposed that a second mold part has the U-profile in a cross-section and has an L-profile with a lateral leg and a base in a longitudinal section complementary to the first L-profile. The two mold parts can be joined together with their end faces opposite the legs, in particular to abut against each other. These end faces, which then abut with each other, can also be referred to as joining faces. The at least two mold parts form a trough in the joined state.

At least one mold part of a mold part assembly has a substantially polygonal outline according to embodiments. Moreover a mold part assembly with at least two joined mold parts has a substantially triangular, rectangular or hexagonal outline according to embodiments. The outline can be in plan view.

In plan view of one mold part according to embodiments, a recess is provided in the mold part, wherein opposing side walls and a leg are form the recess. In plan view, the opposing side walls and the leg form a U-shape that embraces the recess. The base of the mold part does form the bottom of the recess. In plan view of a mold part assembly, the recesses of the at least two mold parts form the through.

A mold part extends perpendicular to a side wall in a transverse direction. That is, the transverse direction can be understood as the surface normal of the surface of the side wall. The mold part extends perpendicular to a leg in a longitudinal direction. That is, the longitudinal direction can be understood as the surface normal of the surface of the leg. The mold part extends perpendicular to its base in a vertical direction. That is, the vertical direction can be understood as the surface normal of the surface of the base.

A longitudinal section through a mold part runs in a plane spanned by the vertical direction and the longitudinal direction. A cross-section through a mold part runs in a plane spanned by a vertical direction and a transverse direction. A horizontal section through a mold part runs in a plane spanned by the transverse direction and the longitudinal direction.

A mold part may have a U-shaped profile in a horizontal section, with a base of the U formed by a side leg and walls of the U formed by opposing side walls, In addition to the first mold part and the second mold part, a third mold part is proposed according to an embodiment. The third mold part has a substantially rectangular cross-section. The third mold part has no legs like the first and second mold parts, but is formed only by the base and the side walls.

The side walls of the first, second and/or third mold part, which in cross-section together with the base span the U-profile, have an inner wall face (aka surface) and an outer wall face (aka surface). The inner wall surfaces face each other and the outer wall surfaces face away from each other. In particular, the side walls are substantially perpendicular to the base. Preferably, the side walls have an extension in the vertical direction corresponding to between 0.5 times and 1 times the extension of the mold part in the transverse direction. It is also proposed that the extension of the side walls in the vertical direction corresponds to between 0.75 times and 1.25 times the extension ofthe side walls in the longitudinal direction. Preferably, the extension of the side walls in the longitudinal direction and in the vertical direction is the same, so that the side walls lie with their upper end faces in the same plane.

A leg of the first and/or second mold part, which in longitudinal section spans the L profile together with the base, has an inner leg face (aka surface) and an outer leg face (aka surface). The leg is in particular substantially perpendicular to the base. Preferably, the leg has an extension in the vertical direction corresponding to between 0.5 and 1 times the extension of the mold part in the transverse direction. Preferably, the extension ofthe leg in the vertical direction is equal to the extension of at least one side wall, so that the leg and the side wall lie with their upper end faces in the same plane. The leg extends in a transverse direction between two side walls.

The wall thickness of a leg is approximately 0.25-0.75 of the extension of the mold part in the longitudinal direction. The wall thickness of the side walls and the wall thickness of the base are preferably similar, in particular substantially the same, with the wall thickness corresponding to between 0.1 and 0.2 times the extension of the mold part in the longitudinal direction. The base is confined in the transverse direction by two side walls. In the first and second mold parts, the base is also confined in the longitudinal direction on one side by a leg and on the opposite side the mold opens up.

According to one embodiment, it is proposed that the legs have an inner leg face (surface] on the side of the base and an outer leg face (surface) facing away from the base.

To assemble the base foundation, it is proposed that a mold part assembly is formed of at least two, preferably three, mold parts. In the longitudinal direction, it is possible that a first mold part abuts a second mold part, with the legs lying on longitudinally opposite sides of the mold part assembly. It is also possible for a first mold part to abut in the longitudinal direction a third mold part, and the third mold part to abut in the longitudinal direction a second mold part. The legs of the first and second mold part then lie on longitudinally opposite sides of the assembly and the side walls lie on transversely opposite sides.

By joining the first two or the three mold parts, the mold part assembly may be formed in a trough shape. The trough base is formed by the respective bases of the joined mold parts. In particular, the bases are aligned with each other in the joined state so that a flat base of the mold part assembly is formed.

The adjoining side walls of mold parts joined together laterally delimit the trough. In particular, the side walls are such that the inner wall surfaces are planar to each other. Furthermore, the inner wall of the trough is formed by the opposing inner leg surfaces of the first and second mold parts.

A transition between an inner wall surface and the base or an inner leg surface and the base may be formed in the form of a fillet. Also, a transition between an inner leg surface and an inner wall surface may be formed in the form of a fillet. The mold parts can be joined to form a mold part assembly, and mold part assemblies can in turn be joined to one another. In order to stabilize the mold part assemblies among each other, they are preferably joined together in a form fit at least in the vertical direction. For this purpose, the outer leg surfaces and/or the outer wall surfaces can have shear keys. The shear keys are in particular projections and recesses, in particular in the form of nuts and tongues. The projections and recesses preferably run parallel to the transverse direction on the outer leg surfaces and parallel to the longitudinal direction on the outer wall surfaces.

The shear keys of opposing outer leg surfaces of a mold part assembly or of opposing outer wall surfaces of a mold part assembly can be complementary to each other. The shear keys of abutting outer wall surfaces of two mold parts of a single mold part assembly can be uniform with respect to each other, especially in their cross-sectional profile. Shear keys of abutting outer leg surfaces of two abutting mold part assemblies may interlock and form a form fit at least with respect to the vertical direction. Shear keys of abutting outer wall surfaces of two abutting mold part assemblies can engage with each other and form a form fit at least with respect to the vertical direction.

It is proposed that shear keys are formed on the outer leg surface. In particular, it is proposed that complementary shear keys are formed on opposing outer leg surfaces. That is, the shear key of an outer leg surface of a first mold part is complementary to the shear key of an outer leg surface of a second mold part of a single mold part assembly. It is then possible that, when a mold part of a first mold part assembly abuts with its outer leg surface against another mold part of a second mold part assembly with its outer leg surface, these leg surfaces interlock with one another and form a form fit, in particular with respect to the vertical axis.

According to one embodiment, it is also proposed that shear keys are formed on the outer wall surface. The opposing outer wall surfaces of a respective mold part in turn preferably have complementary shear keys. It is then possible that, when an outer wall surface of a mold part of a first mold part assembly abuts against an outer wall surface of a mold part of a second mold part assembly, these wall surfaces interlock with one another and form a form fit, in particular with respect to the vertical axis.

According to one embodiment, it is proposed that the two first mold parts have a joining surface on their end face facing away from the outer leg surface. The joining surface is in particular a flat surface on which the two mold parts can be joined together, in particular can be placed directly against each other.

According to one embodiment, it is proposed that the third mold part has a joining surface on each of two opposite end faces. It is thus possible to abut the first mold part with its joining surface against a first joining surface of the third mold part and to abut the respective other joining surface of the third mold part against a joining surface of a second mold part. This makes it possible for the three mold parts to form a trough shaped mold part assembly.

It is also possible for the joining surfaces to have similar shear keys as described. Adjacent joining surfaces of two mold parts of a mold part assembly can have complementary joining surfaces. The joining surface of the first mold part can be complementary to the joining surface of the second mold part. The opposing joining surfaces of the third mold part can be complementary to each other. One joining surface of a third mold part can be complementary to a joining surface of a first mold part and the other joining surface of the third mold part can be complementary to a joining surface of a second mold part.

For clamping the mold parts to form the mold part assembly and for clamping mold part assemblies to one another, it is proposed that the mold parts can be clamped by means of tendons or bars. In the following, the term tendon is used, but can be replaced by bar or bolt with the same meaning. The tendons are suitable for clamping the mold parts of a mold part assembly to one another. The tendons are also suitable for clamping at least two adjacent mold part assemblies. According to one embodiment, it is proposed that a side wall has at least one receptacle (through-opening] for at least one tendon extending in the longitudinal direction between an outer leg surface and a joining surface. This applies in particular to the first and second mold parts.

According to an embodiment, the third mold part can have a receptacle for at least one tendon extending in the longitudinal direction inside a side wall between two joining surfaces. Preferably, at least two receptacles running parallel to one another are provided in one side wall each.

In the joined state of the mold parts, the receptacles are aligned with one another. In the joined state of the mold part assemblies, the receptacles are likewise aligned with one another. The alignment of the receptacles can be optimized in particular by the fact that at least one alignment of the mold part assemblies with respect to one another in the vertical direction is fixed by the shear keys due to their complementary form, and thus the receptacles can also aligned with respect to one another. Also, the alignment of the mold part assemblies with respect to one another is fixed by post tension forces applied in the tendons, which might bring the complete flexural behavior of the assembly to equal a monolithic.

According to one embodiment, it is proposed that a mold part has a receptacle for at least one tendon extending in the transverse direction inside one leg between two outer wall surfaces. This applies to the first and second mold parts. Preferably, at least one receptacle is provided in each leg. In the joined state of the mold parts, the receptacles are aligned with one another. In the joined state of the mold part assemblies, the receptacles are likewise aligned with one another. The alignment of the receptacles can be optimized in particular by the fact that at least one alignment of the mold part assemblies with respect to one another in the vertical direction is fixed by the shear keys due to their complementary form, and thus the receptacles can also aligned with respect to one another. According to one embodiment, it is proposed that a first mold part assembly is form fitted to a second mold part assembly via the shear keys of abutting outer wall surfaces and/or via the shear keys of abutting outer leg surfaces. In particular, the shear keys form a form fit in the vertical direction.

According to one embodiment, the mold parts are formed as precast parts, in particular as precast concrete parts. The mold parts are in particular prefabricated precast parts that can be delivered to the construction site in a prefabricated state.

The mold parts are preferably formed from a mineral building material, in particular from concrete. The concrete is in particular a high-strength concrete or an ultra-high- strength concrete. Preferably, fiber reinforcements is provided in the concrete, in particular synthetic fiber reinforcements. This can be a basalt fiber or a carbon fiber. However, metal fibers are also possible. In particular, the precast elements are made of fiber-reinforced concrete (FRC). FRP fibers, basalt fibers, metallic fibers or rebars (metallic or non-metallic) can be used. The tensile strength of the finished parts can be increased by using fibers, in particular glass fibers, carbon fibers, basalt fibers or the like. Here, a fiber content of at least 1%, preferably at least 1,5%, preferably not more than 2%, is advantageous in order to achieve a sufficiently high tensile strength. A further increase in tensile strength results from post tensioning of the mold parts by means of the tendons. Sufficient compressive strength results from the use of the mineral building material, in particular concrete.

For the production of the mold parts, two or three mold forms can be provided from which the first, second and third mold parts can be formed. Due to the mold forms, the mold parts are identical in construction to each other and can be produced in a large number.

By joining the first and second mold parts or the first, second or third mold parts as described above, respective mold part assemblies are formed. The mold part assemblies can then be joined together depending on the application. The mold parts can be placed on a clean (levelled] layer at the construction site and clamped by means of the tendons. The shear keys ensure that the mold parts of a mold part assembly are interlocked in form fit. The tendons can be guided through receptacles of mold parts of adjacent mold part assemblies and thus clamp two or more mold part assemblies together.

On the one hand, the tendons are suitable for clamping/bracing the mold parts of a mold part assembly against each other. On the other hand, the tendons are suitable for clamping at least two adjacent mold part assemblies.

The tendons can also post tension (over press, compress] the mold parts, which means that the mold parts are given a mechanical tension by the tendons. This increases the tensile strength against tensile stress of the mold part, especially if it is formed from a mineral building material, such as concrete. A tendon is in particular a post tensioning steel. The tendon can be inserted in the form of a bar through suitable through-openings running in the mold parts and tensioned at the outer outlets of the mold parts joined together or of the mold part assemblies joined together, in particular by means of bolting.

The molded assemblies form side-by-side troughs that can be backfilled with excavated or imported material to increase the bearing weight of the foundation.

According to another aspect, a wind turbine foundation includes a central foundation body having an upper face, a lower face, and at least one side face extending between the upper face and the lower face. This foundation body serves as a support for a junction console for a tower of the wind turbine at the upper face. This foundation body may also be understood as pedestral.

The central foundation body can take up the tendons. The central foundation can be cast on site. The junction console can be a standard anchor cage. The junction console can be made from tendons trough an adapter plate, which is closed by the side faces and which can be cast on site.

At least one mold part assembly having at least one set of mold parts as described is disposed on a side face. The central foundation body can be manufactured on site, in particular formed and cast. In this context, it is possible in particular for tendons to be guided through the formwork mold and to be integrated into the foundation body during casting. It is also possible, in particular, that receptacles for tendons are provided in the formwork for the foundation body and are integrated into the foundation body during casting. It is also possible that the foundation body is a prefabricated concrete component arid in particular has a receptacle for the tendons or integrated tendons.

In plan view, the foundation body is polygonal, in particular rectangular, preferably square. A mold part assembly can be arranged on each of the side faces, in particular four side faces. Thus, it is possible for one mold part assembly with one leg of the first mold part or the second mold part to bear against two mutually opposite side faces of the foundation body. A mold part assembly with a respective third mold part with its respective outer side wall can be in contact with two further mutually opposite side faces of the foundation body. The side faces of the central foundation body have shear keys complementary to the outer wall faces or the outer leg faces. This allows the side faces of the foundation body to be form fitted to the mold parts.

The molded assemblies can be arranged in a cellular pattern around the foundation body. The number of assemblies and extend can be as required to meet the ground (soil) conditions avoiding overstresses in the ground.

According to an embodiment, the tendons extend from a first mold part assembly over the foundation body to a second mold part assembly. In particular, the tendons extend from a first outer edge of the foundation to a second outer edge of the foundation, the outer edges preferably being located on two opposite sides of the foundation, preferably parallel to each other. The plan view of the foundation body is preferably geometrically similar, in particular the same as the plan view of a mold part assembly of two or three mold parts. The subject matter is explained in more detail below with reference to a drawing showing embodiments. In the drawing show:

Fig. la a first mold part according to an embodiment;

Fig. lb a second mold part according to an embodiment;

Fig. lc a third mold part according to an embodiment;

Fig. 2a a first mold part according to Fig. la with a further shear key;

Fig. 2b a second mold part according to Fig. lb with a further shear key;

Fig. 2c a third mold part according to Fig. lc with a further shear key;

Fig. 3a-c Mold parts according to Figs, la-c with shear keys on the joining surfaces according to embodiments;

Fig. 4a view of a mold part assembly according to an embodiment;

Fig. 4b plan view of a mold part assembly according to Fig. 4a;

Fig. 5 longitudinal cross section through a mold part assembly according to

Fig. 4b;

Fig. 6 further mold part assemblies according to an embodiment;

Fig. 7 another mold part assembly according to an embodiment. Fig. 8 another mold part assembly according to an embodiment. For the discussion, the following definitions are used. The X, Y, Z coordinate system shown in Fig. la shows a longitudinal direction in the X-axis, a transverse direction in the Y-axis, and a vertical direction in the Z-axis. A cross section is parallel to a plane spanned by the Y and Z axes. A longitudinal section is parallel to a plane spanned by the X and Z axes. A horizontal section is parallel to a plane spanned by the X and Y axes.

The first mold part 2a has a leg 4, a base 6, and two opposing side walls 8a, 8b. The side wall 8a has an outer wall surface 8a' and an inner wall surface 8a" (not shown]. The side wall 8b has an inner wall surface 8b" and an outer wall surface 8b' (not shown). The leg 4 has an outer leg surface 4 (not shown) and an inner leg surface 4".

The base 6, the inner leg surface 4" and the inner wall surfaces 8a", 8b" span a recess in the first mold part 2a. In a longitudinal cross section in the area of the base 6, the first mold part 2a has an L-profile and in a transversal cross-section in the area of the base 6, the mold part 2a has a U-profile.

On the side opposite the outer leg surface 4a', the first mold part 2a has a joining surface 10.

On the outer surfaces, in particular the outer wall surface 8a', the outer wall surface 8b' and/or the outer leg surface 4', the first mold part 2a has shear keys, in particular formed as tongue and groove. The shear keys on the outer wall surface 8a' are complementary to the shear keys on the outer wall surface 8b'. This allows a mold part 2a to be placed with its outer wall surface 8a' against the outer wall surface 8b' of another mold part 2a, resulting in an interlocking, e.g. by a form fit.

The shear keys are such that two such mold parts 2a can abut against each other and come into interlock with each other. In such a case preferably the surfaces of the upper leg faces of abutting mold parts are flush. Moreover, the base surfaces of abutting mold parts are flush. This may apply to all abutting mold parts as shown in the following figures. An outer wall surface is complementary to an outer wall surface abutting it, so that in each case two mold parts can be "plugged into one another", in particular can be connected to one another in a form-fit manner, in which case a form-fit is then effected in particular at least in the vertical direction. This means that the mold parts are interlocked relative to at least the vertical direction.

Running transversely through the leg 4, at least one through opening [recess) 12 can be provided. This can be used to accommodate a tendon. Through-openings (recesses) 12 can be provided in parallel running through the side walls 8a, b in the longitudinal direction. The recesses 12 parallel to the transverse direction are offset in the vertical direction from the recesses 12 parallel to the longitudinal direction. One or more recesses 12 may be provided both in the leg 4 and in the side walls 8a, b. In particular, the recesses 12 have a diameter which is a clearance fit with a tendon, in particular a round steel bar. The recesses 12 can accommodate tendons.

Fig. lb shows a second mold part 2b which is mirroring the first mold part 2a, in particular mirrored on the plane spanned by the Z and Y axes, in particular on the joining surface 10. The explanations for the first mold part 2a thus apply in mirror to the second mold part 2b. In particular, the joining surfaces 10 of the two mold parts 2a, 2b are congruent with each other, so that two mold parts 2a, b can abut at their joining surfaces 10 and clamped together by means of tendons through the recesses 12.

A third mold part 2c is shown in Fig. lc. This third mold part 2c has two side walls 8a, 8b.The side walls 8a, b are shaped with their wall surfaces 8a’, 8a", 8b', 8b" corresponding to the wall surfaces 8a', 8a", 8b', 8b" of the first two mold parts 2a, 2b and the explanations thereto apply accordingly. In particular, the shear keys are identical thereto. However, the third mold part 2c does not have a leg 4 but has only a U-profile in cross section over its entire longitudinal extend. The joining surfaces 10 lie on opposite sides of the base 6. The joining surfaces 10 are congruent with the respective joining surfaces 10 of the first mold part 2a and the second mold part 2b. Recesses 12 are provided in the side walls 8a, b. The positions of the recesses 12 in the side walls 8a, b are identical to the positions of the recesses 12 in the side walls 8a, b of the first two mold parts 2a, b.

A rnold part assembly can now be formed by joining at the joining surfaces 10 a first mold part 2a and a second mold part 2b. Also, a mold part assembly can be formed by joining at the joining surfaces 10 first a first mold part 2a with a third mold part 2c and then the third mold part 2c with the second mold part 2b

The orientation of the mold parts 2a-c is such that the shear keys on the outer wall surfaces 8a', 8b' on mold parts 2a-c are joined together to form a mold part assembly. The three mold parts form a trough-shaped mold part assembly, the trough being formed by the bases 6, the side walls 8a, b and the opposite legs 4. Opposing outer wall surfaces _, 8a', 8b' are complementary to each other. Opposing outer leg surfaces 4' of first mold part 2a and second mold part 2b are also complementary to each other. Two mold part assemblies can be connected to each other via the shear keys, with the lower surface and the upper surface of two connected mold part assemblies being flush. This is made possible by the complementary shear keys.

Figs. 2a-c show alternative shear keys for the mold parts 2a-c. The only difference to the embodiments shown in Figs la-c lies in the shear keys. The shear key shown in Figs. 2a-c is such that a form fit is possible in the vertical direction as well as in the transverse and longitudinal directions. The shear key is relief-shaped along two directions, whereas in Figs. 1 it is relief-shaped along only one direction. The shear key is pyramidal or conical, in particular in the form of truncated pyramids, or truncated cones.

Figs. 3a-c show three mold parts 2a-c according to Figs. la-c. In contrast, however, the joining surfaces 10 are also provided with shear keys. These shear keys are preferably corresponding to the shear keys in Figs. la-c. However, they can also correspond to the shear keys in Figs. 2a-c, which is not shown. By means of these shear keys on the joining surfaces 10, a form fit can be achieved between two mold parts 2a-c abutting at joining surfaces 10. The shear key secures the position of the mold parts 2a-c of a single mold part assembly relative to each other in addition to securing via tendons inserted in the recesses 12.

Fig. 4a shows a view of a wind turbine foundation 14. The wind turbine foundation 14 preferably has a central foundation body 16 (aka pedestral) with an anchor cage 18 for a tower of a wind turbine. The connection of a wind turbine to an anchor cage 18 is known per se. There are various possibilities for connecting a tower of a wind turbine, in particular a tower of a wind turbine, to an anchor cage 18. It should be noted that the design of the pedestral 16 and the anchor cage 18 can be according to the needs of the tower, the ground, etc. The pedestral 16 and/or the anchor cage 18 can be formed from concrete and or steel.

The foundation body 16 and the anchor cage 18 can be manufactured on-site, in particular in the form of a molded concrete structure. The outer wall faces of the foundation body 16 can also be formed, in particular in areas where they come into contact with the mold part assemblies, with shear keys matching the shear keys of the mold parts 2a-c, in particular congruent with the shear keys of abutting outer wall surfaces 8a', 8b' or outer leg surfaces 4'.

In Fig. 4a, it can be seen that first mold part assemblies 20 are formed from mold parts 2a, 2b, 2c. In addition, second mold part assemblies 22 are formed in a central gap around the foundation body 16 from two third mold parts 2c. The mold part assemblies 20, 22 are clamped together by tendons passing through the recesses 12 through a plurality of mold part assemblies 20, 22.

Fig. 4b shows the structure of the mold part assemblies 20, 22 around the central foundation body 16. In a first column, mold part assemblies 20 each comprising a first mold part 2a, a third mold part 2c, and a second mold part 2b are arranged side by side. These mold part assemblies 20 are clamped together via tendons 24. In a second column, mold part assemblies 22 are arranged around the central foundation body 16. These mold part assemblies 20 are clamped together via tendons 24, which can also run through the foundation body 16.

In a third column, mold part assemblies 20 each having a first mold part 2a, a third mold part 2 c, and a second mold part 2b are arranged side by side. These mold part assemblies 20 are clamped together via tendons 24.

Tendons 26 run perpendicular to tendons 24 through recesses 12 in side walls 8a, b, with which the mold part assemblies of the first, second and third columns are clamped to one another and/or to the foundation body 16. Via the tendons 24, 26, the mold part assemblies 20, 22 can be clamped with each other and with the foundation body 16.

Fig. 5 shows a longitudinal cross section through a foundation 14 according to Fig. 4b. It can be seen that the mold part assemblies 20 enclose the foundation body 16. The mold part assemblies 20 and the foundation body 16 are clamped together via the tendons 26. It can also be seen that backfill material 28 can be filled into the troughs to increase the stability of the foundation 14. Fig. 6 shows a further embodiment in which compared to Fig. 4a (which description can be applied here as well) two instead of one mold part assemblies 20, 22 are arranged radially in each direction around the foundation body 16. These five mold part assemblies 20, 22 are also clamped together via tendons 24, 26 (not shown). The shear keys correspond to Figs. la-c.

Fig.7 shows a further embodiment in which compared to Fig. 4a (which description can be applied here as well) two instead of one mold part assemblies 20, 22 are arranged radially in each direction around the foundation body 16. These five mold part assemblies 20, 22 are also clamped together via tendons 24, 26. In contrast to Fig. 6, the shear keys correspond to Figs. 2a-c. Largely identical in structure, it is also possible to form mold part assemblies around the foundation body 16, each consisting of a first mold part 2a and a second mold part 2b. The third mold part 2c can be omitted and only mold part assemblies formed from a first mold part 2a and a second mold part 2b are arranged around the foundation body 16 as shown in Fig. 8 and clamped in the described manner via the shear keys and tensioned via the tendons 24, 26 (not shown).

List of reference signs

2a-c mold parts

4 legs

4 outer leg face

4 inner leg face

6 base

8a, b Side wall

8a', 8b’ outer wall face 8a", 8b" inner wall face

10 jointing face

12 recess

14 wind turbine foundation

16 pedestral

18 anchor cage

20, 22 mold part assembly

24, 26 tendons