Wind turbine tower made of prefabricated concrete parts in the shape of annular segments

Abstract

A tower for a wind turbine includes at least one tower section made of concrete, made up of several annular concrete segments arranged on top of one another with horizontal joints. Each concrete segment includes at least two annular segment prefabricated concrete parts arranged in parallel with vertical joints. The each have one outer side, one inner side and one upper, lower and two lateral contact faces. The concrete segments are connected to one another in the vertical direction by vertical clamping devices.

Claims

1. A tower for a wind turbine comprising: at least one tower section of concrete with an inner wall which is pre-stressed with vertical tendons between a head bearing and a foot bearing, the tower section having an inner wall defining an interior of the tower section, the vertical tendons located completely radially inward of the cross-section in the interior and adjacent the inner wall, wherein the inner wall between the head bearing and the foot bearing has at least one adapted projection formed unitary with the tower section and on which at least one of the vertical tendons abuts an outermost surface of the projection.

2. The tower according to claim 1, wherein the projection has a rectangular cross section.

3. The tower according to claim 1, wherein the projection is configured circumferentially across an inner circumference of the tower section.

4. The tower according to claim 3, wherein several of the projections are arranged across the inner circumference of the tower section distributed at the same height.

5. The tower according to claim 1, wherein the at least one vertical tendon abuts on the at least one projection at a deflection angle ().

6. The tower according to claim 1, wherein the tower section has several projections adapted vertically offset to the inner wall of the tower.

7. The tower according to claim 1, wherein the tower section has at least one annular concrete segment to which the at least one projection is adapted.

8. The tower according to claim 7, wherein the annular concrete segment is made up of at least two prefabricated concrete parts arranged in parallel, wherein the at least one projection is adapted to at least one of the prefabricated concrete parts.

9. A tower for a wind turbine comprising: at least one tower section having a plurality of annular concrete segments that define a central axis that is vertical, each annular concrete segment including at least two prefabricated concrete parts, each prefabricated concrete part having an outer side, an inner side, an upper contact face, a lower contact face, two lateral contact faces, and a center area between the two lateral contact faces, each prefabricated concrete part having a reinforcing element located only in the center area and embedded within the prefabricated concrete part, the annular concrete segments arranged in a vertical stack with a horizontal joint located between respective upper contact faces of the prefabricated concrete parts within one annular concrete segment and respective lower contact faces of the prefabricated concrete parts within an adjacent annular concrete segment, the prefabricated concrete parts within each annular concrete segment arranged with a vertical joint between the lateral contact faces of each adjacent pair of prefabricated concrete parts, each of the vertical joints within a given annular concrete segment being offset circumferentially relative to the central axis from the vertical joints within adjacent annular concrete segments so that the reinforcing element of each prefabricated concrete part in an annular concrete segment underlying another annular concrete segment underlies a vertical joint within the another annular concrete segment, the annular concrete segments being joined together in a direction along the central axis only by vertical clamping devices that create a load-bearing friction connection between the annular concrete segments.

10. The tower according to the claim 9, wherein the prefabricated concrete parts of each vertical joint of each annular concrete segment is joined together only by a friction connection extending through each prefabricated concrete part of each vertical joint.

11. The tower according to claim 10, wherein at least the lateral contact faces of the prefabricated concrete parts are configured flatly and obtusely abut against one another to form the vertical joints.

12. The tower according to claim 11, wherein the lateral contact faces of the prefabricated concrete parts each have at least one raised contact area.

13. The tower according to claim 9, wherein at least one of the upper contact face and the lower contact face is ground.

14. The tower according to claim 9, wherein the prefabricated concrete parts of one of the annular concrete segments are joined together by one of horizontal-clamping devices and tension joint screw devices.

15. The tower according to claim 9, wherein the annular concrete segments are made of at least three identical prefabricated concrete parts.

16. The tower according to claim 9, wherein the upper contact faces, the lower contact faces, and the lateral contact faces of the prefabricated concrete parts are flat.

17. The tower according to claim 9, wherein a height (H) of the prefabricated concrete parts is smaller than a width (B) of the prefabricated concrete parts.

18. The tower according to claim 17, wherein the height (H) of the prefabricated concrete parts is less than 3 m.

19. The tower according to claim 9, wherein the vertical clamping devices include vertical tendons guided unbonded and outside of the cross-section of the prefabricated concrete parts.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Additional advantages of the invention are described with the help of the embodiments depicted below, which show:

(2) FIG. 1 is an overview of a tower of a wind turbine with a tower section of concrete.

(3) FIG. 2 is a schematic diagram of a tower section with horizontal joints and vertical joints.

(4) FIG. 3 is an inner side view of an annular segment prefabricated concrete part.

(5) FIG. 4 is a truncated, schematic sectional diagram of a tower made up of several annular concrete segments arranged on top of one another, pre-stressed with vertical tendons.

(6) FIG. 5 is a top view of a tower section with a concrete segment made up of four annular segment prefabricated concrete parts.

(7) FIG. 6 is a frontal view from the inside of another embodiment of an annular segment prefabricated concrete part.

(8) FIG. 7 is a top view of the annular segment prefabricated concrete part of FIG. 6.

(9) FIG. 8 is a sectional view of a tower pre-stressed with vertical tendons, made up of several annular concrete segments arranged on top of one another according to a second embodiment.

(10) FIG. 9 is a schematic sectional view of an annular concrete segment with a projection.

(11) FIG. 10 is a top view of an annular segment prefabricated concrete part with a projection.

(12) FIG. 11 is a top view of another embodiment of an annular segment prefabricated concrete part with a projection.

(13) FIG. 12 is a top view of another embodiment of an annular segment prefabricated concrete part with several projections.

(14) FIG. 13 is a top view of another embodiment of an annular segment prefabricated concrete part with several projections.

DETAILED DESCRIPTION

(15) FIG. 1 shows a tower 1 for a wind turbine with at least one tower section 3 of concrete. The tower 1 is typically erected on a foundation 2 and designed here as a hybrid tower, which means that another tower section 4 of steel is arranged and situated on the tower section 3 of concrete, whereas the two sections 3 and 4 are joined together with a transition piece 5. Deviating from the diagram shown, however, it is also possible for the tower to just have one or several tower sections 3 of concrete, in which case the tower sections 3 of concrete can also be designed differently. Here, the tower section 3 of concrete has a conical design, but it is also possible for one or several tower sections 3 of concrete to have a cylindrical design (as FIG. 4 shows) or to combine a conical tower section 3 of concrete with a cylindrical tower section 3 of concrete.

(16) The tower section 3 of concrete shown here consists of several annular concrete segments 7 arranged on top of one another, in each case arranged on top of one another by forming horizontal joints 6. Each concrete segment 7 of the tower section 3, in turn, consists of at least 3 annular segment prefabricated concrete parts 9, which are arranged in parallel by forming vertical joints 8 in circumferential direction of the individual concrete segments 7.

(17) The concrete segments 7 of the at least one tower section 3 of concrete are joined together by vertical clamping devices, particularly vertical tendons 18, as FIG. 4 especially shows. Finally, on the other end of the tower 1, a gondola and rotor of the wind turbine can still be typically arranged (not shown here). In addition to the tower section 3 shown here, in which the individual concrete segments 7 consist of several prefabricated concrete parts 9, additional tower sections 3 can be present, in which the concrete segments 7 are executed as full rings. This is especially advantageous with conical towers 1, in which the upper concrete segments 7 have a smaller diameter.

(18) FIG. 2 shows a schematic, truncated detailed representation of a tower section 3 with horizontal joints 6 and vertical joints 8. It can be seen in it that each concrete segment 7 of the tower section 3 consists of at least two prefabricated concrete parts 9, made up by forming a vertical joint 8. It can furthermore be seen that each prefabricated concrete part 9 has one upper contact face 11, one lower contact face 12 and two lateral contact faces 13. Here, the lateral contact faces 13 have been provided with raised contact areas 14 that abut against one another in horizontal direction of the tower 1 or concrete segment 7. FIG. 3 shows such an individual annular segment prefabricated concrete part 9 seen from the inner side 16.

(19) For reasons of better clarity, FIG. 2 shows these contact areas 14 slightly separated from one another and also strongly protruding. In fact, however, in the fully assembled tower 1, the contact areas 14 are mounted all the way to the stop and protrude only slightly from the lateral contact faces 13. Furthermore, the horizontal joints 6 (shown fully closed here) can be recognized, which also corresponds to the condition after the vertical pre-stress was applied.

(20) As can now be seen in the schematic longitudinal section of FIG. 4, the tower section 3 of concrete is pre-stressed in vertical direction by vertical tendons 18, which join together the individual concrete segments 7 arranged on top of one another. Here, the vertical tendons 18 are unbonded and guided into the interior 24 of the tower outside of the concrete cross section of the prefabricated concrete parts 9 and therefore easily built in. The concrete segments 7 are joined here together in vertical direction of the tower 1 only by the vertical tendons 18. In this case, the vertical tendons 18 are fixed to a foot bearing, preferably the foundation 2, of the tower 1 and extend at least all the way to the end of the corresponding tower section 3 of concrete, where they are preferably fixed to a head bearing, which can be the transition piece 5 (see FIG. 8). Here, the vertical tendons 18 are guided into the foundation 2 through cladding tubes 17.

(21) So the horizontal joints 6 can be executed as narrowly as possible and can still be fully closed, the upper and lower contact faces 11, 12 of the prefabricated concrete parts can be ground. Therefore, the contact faces 11, 12 have such low tolerances both with regard to their flatness and to their parallelism to one another that at least the horizontal joints 6 are almost fully closed at least after the pre-stress is applied by the vertical tendons 18. The lateral contact faces 13, or rather their contact areas 14 (see FIGS. 2 and 3), can therefore be ground so the vertical joints can be executed as narrowly as possible too. The grinding of the contact faces furthermore facilitates the assembly of the tower section, since owing to the high precision with regard to the position of the contact faces 11, 12, 13 no more alignment work needs to be done. However, instead of grinding the contact faces 11, 12, 13 it is likewise possible to manufacture the prefabricated concrete parts already as high-precision parts, as explained with the help of FIGS. 5-7.

(22) Now, as FIG. 2 also shows, the prefabricated concrete parts 9 of one concrete segment 7 are joined in horizontal direction by a friction, load-bearing connection through the pre-stress force of the vertical tendons 18 and that of the prefabricated concrete parts 9 of the concrete segment 7 lying above that overlap the vertical joints 8. Therefore, to assemble the tower section 3, the prefabricated concrete parts 9 are loosely placed on those of the concrete segment 7 lying underneath and placed all the way to the stop with regard to their lateral contact faces 13, so that the vertical joints 8 are largely closed. Afterwards, the prefabricated concrete parts 9 of the concrete segment 7 lying above are put down in such a way that the vertical joints 8 are offset from the concrete segment 7 lying underneath and the prefabricated concrete parts 9 of each upper concrete segment 7 overlap the vertical joints 8 of each concrete segment 7 lying below. If the concrete segments 7 are made up of two prefabricated concrete parts 9, then the prefabricated concrete parts 9 of the concrete segments 7 lying on top of one another are preferably offset in each case by 90 to each another. However, other offset angles, for example of only 45, are possible as well. Subsequently, the vertical tendons 18 are put in place and tensioned. In this case, the vertical tendons 18 are pre-stressed with such a high pre-stressing force that they prevent the resulting friction force occurring in the horizontal joints 6 from moving the prefabricated concrete parts 9 apart in horizontal direction, thereby preventing an opening of the vertical joints 8.

(23) In this case, due to the lateral contact faces 13 or their contact areas 14 butting against one another, the tower 1 is provided with good horizontal stiffness and better load-bearing capacity under bending stress. If the contact faces 13 are provided with the raised contact areas 14, then the positioning of the individual prefabricated concrete parts 9 will also be facilitated during the assembly. Preferably, the prefabricated concrete parts 9 have at least one contact area 14 on each lateral contact face 13 with which in mounted state they make contact with a lateral contact area 14 of an adjacent prefabricated concrete part 9. As far as two contact areas 14 are provided on one lateral contact face 13 of a prefabricated concrete part 9, it is also sufficient if in the vertical joint only one of the contact areas 14 makes contact with a contact area 14 of an adjacent prefabricated concrete part 9.

(24) However, the contact faces 13 can likewise be executed as smooth, flat surfaces without contact areas 14, as FIG. 5 shows. Since the holding together of the individual prefabricated concrete parts 9 of a concrete segment 7 is significantly or even exclusively brought about by the friction forces in the horizontal joints 6, the contact areas 14 are not absolutely necessary. For the same reason, it does not affect the stiffness of the tower 1 if the vertical joints 8 open up somewhat under stress or one vertical joint 8 possibly also remains fully open due to the assembly tolerances. In any case, owing to the load-bearing connection made possible by the pre-stressing force of the vertical tendons 18, neither a casting nor a screwing of the vertical joints 8 is necessary.

(25) Because the individual prefabricated concrete parts 9 of a concrete segment 7 are not joined to one another, if a loading case occurs, it can cause significant stress peaks in the area of the prefabricated concrete parts 9 of the concrete segment 7 that lies underneath a vertical joint 8. According to the diagram of FIG. 2, the prefabricated concrete parts 9 have therefore been provided with extra reinforcement 15 or a higher reinforcement content in their upper end, in the area lying under the vertical joint 8, which depending on offset angle, lies usually in the center of the prefabricated concrete part 9.

(26) So a tower section 3 of a wind turbine can be manufactured in an especially easy way and mounted on the construction site, according to the embodiment shown in FIG. 5, it is provided for the annular segment prefabricated concrete parts 9 to be executed as exact identical parts. As a result of this, easy manufacturing of the prefabricated concrete parts 9 with the fewest possible formworks can be achieved. It is advantageous here for the individual concrete segments 7 not to be made up of two, but of three or more prefabricated concrete parts 9. Because of this, the individual prefabricated concrete parts 9 are smaller and can therefore be more easily transported to the construction site or manufactured locally on the construction site with transportable formworks.

(27) In order to facilitate the handling of the prefabricated concrete parts 9 on the construction site and their positioning on each concrete segment 7 lying underneath, according to this diagram the individual prefabricated concrete parts 9 are put together using horizontal screw connections 19 to create one concrete segment 7. To achieve this, according to this diagram, two screws 20 are necessary for each vertical joint 8, vertically offset and introduced to the connection point from inside at an angle. Here, the screw connection points are easily accessible from the inner side 16 through recesses 22, so that the screw connections 19 can be easily made or easily removed again if necessary. In this case, the screw connection 19 contains one dowel 21 molded in the area of a lateral contact face 13 of a prefabricated concrete part 9, and a screw 20 introduced through the recess 22 of an adjacent prefabricated concrete part 9 into the dowel 21.

(28) Here, the screw connections 19 are provided as mounting aids, without serving to transfer the force under normal operation. Only in an extreme case when there are strong wind stresses, for example, they will serve to transfer the force. By means of the screw connections 19, it is possible to fix several prefabricated concrete parts 9 of a concrete segment 7 together and handle them as one structural part. The concrete segment 7 can thus be assembled quicker and easier at the mounting location with the screw connections 19 and placed on the already existing tower section 3. In this case, the screw connections 19 are designed in such a way that they bear the own weight of the structural part formed in such a way. The prefabricated concrete parts 9 are thereby joined together even before the vertical tendons 18 are tensioned and already secured as a result of that while the tower section 3 is being assembled. After the tower is completed, the screw connections 19 can be left in the prefabricated concrete part to eliminate the removal working step or to ensure the tower's own stability in case of maintenance, when the vertical tendons 18 are exchanged or during a dismantling, for example.

(29) FIG. 6 shows a frontal view for a prefabricated concrete part 9 suitable for such a tower section 3 seen from the inner side 16 and FIG. 7 shows a top view. Here, the prefabricated concrete part 9 has one outer side 10, one inner side 16, one upper contact face 11, one lower contact face 12 and two lateral contact faces 13. Like the prefabricated concrete part of FIG. 3, these prefabricated concrete parts 9 can also have contact areas 14. However, the contact faces 13 can also be executed as completely flat surfaces. The height H of the annular segment prefabricated concrete parts 9 is here considerably smaller than their width B. Preferably, the height H of the prefabricated concrete parts is less than 3 m. Therefore, the prefabricated concrete parts 9 can be transported lying flat, without exceeding the maximum permissible road transportation width. It is therefore especially advantageous for the prefabricated concrete parts 9 to be less than 2.50 m high because they can then be transported with conventional transportation vehicles. The height of the prefabricated concrete parts 9 is here oriented in transverse direction of the transportation vehicle. In this case, it is especially advantageous that owing to their shell-like design, the prefabricated concrete parts 9 can be stacked, therefore allowing also several superimposed prefabricated concrete parts 9 to be transported lying flat.

(30) The prefabricated concrete parts 9 are in this case manufactured with a formwork (not depicted) as high-precision parts. This means that the prefabricated concrete parts 9 reach their ready-to-install final contour already through the casting, without needing another processing step. The prefabricated concrete parts 9 are cast here with such a high degree of precision that the upper contact face 11 and lower contact face 12 are oriented exactly plane-parallel to one another without post-processing. Likewise, the two lateral contact faces 13 are oriented to one another at an exact right angle towards the upper and lower contact faces 11, 12. The angle between the two lateral contact faces 13 of each prefabricated concrete part 9 is 120 with three prefabricated concrete parts 9 per concrete segment 7, and 90 with four prefabricated concrete parts 9 per concrete segment 7.

(31) To do this, the formwork (not shown) to manufacture the prefabricated concrete parts contains in each case two frontal formworks and two lateral formworks, each adjustable independently of one another with regard to the basic formwork. Subsequent work to achieve plane-parallelism in each one of the two contact faces 11, 12 lying opposite one another is therefore unnecessary. Likewise, the orientation of the lateral contact faces 13 to the upper and lower contact faces 11, 12 is in each case developed precisely in such a way that when several prefabricated concrete parts 9 are assembled to create an annular concrete segment 7, no compensation mass must be introduced into the vertical joints.

(32) Due to the small dimensions of the prefabricated concrete parts 9 and therefore of the associated formworks as well, the prefabricated concrete parts 9 can be manufactured directly at the assembly location or at least close to it, so that no difficult and expensive transporters, which often require the construction of new access roads and the whacking of approach paths, are necessary. Once the tower 1 or planned towers 1 have been fully erected on the assembly site, the formworks can be simply be transported further to the next assembly site and serve there once again for the on-site manufacture of prefabricated concrete parts 9. Thus, in spite of the on-site production, an economical manufacture of the prefabricated concrete parts 9 or towers 1 is made possible.

(33) The schematic cross section diagram of FIG. 8 shows another embodiment of the tower 1. Like the tower section 3 shown in FIG. 4, the tower section 3 shown here is made up of several annular concrete segments 7 arranged on top of one another. The concrete segments 7 arranged on top of one another are, in turn, held together by means of vertical tendons 18, which extend between a head bearinghere once again a transition piece 5and a foot bearing, here once again the foundation 2. Here, the vertical tendons 18 are at least fixed to one of their two ends, but preferably on both of their ends, with a pre-stressing anchor and can thus be restressed. The vertical tendons 18 also run outside of the concrete cross section of the concrete segments 7 into the interior 24, which is enclosed by the inner wall 23 of the tower section 3. Here, the inner wall 23 consists, in turn, of the individual inner sides 16 of the individual concrete segments 7 or of the individual prefabricated concrete parts 9 of the concrete segments 7 (see FIGS. 10-12). In this case, the individual concrete segments 7 can be executed as one annular piece or, as already described in FIGS. 2-7, made up of several annular segment prefabricated concrete parts 9.

(34) Here, only the tower section 3 of the tower 1 is shown. Naturally, another tower section 3, 4 of concrete or steel can also be arranged on this tower section 3, which together with the tower section 3 shown here, then forms the tower 1 for the wind turbine. In this case, the vertical joints 6 between the individual concrete segments 7 are recognizable as well. For reasons of clarity, only the outer side 10 and the inner side 16 of the individual concrete segments 7 are named in this diagram. Needless to say, however, they also have one upper contact face 11, one lower contact face 12, andas far as the concrete segments 7 are built of prefabricated concrete parts 9lateral contact faces 13, as they were described in the previous figures. The same applies to the following FIGS. 9-12, on which due to reasons of clarity, only the structural parts or characteristics described were labeled.

(35) As can now be seen in FIG. 8, according to this diagram, the concrete segment 7 has on its inner side 16 a projection 25, on which the vertical tendons 18 abut. Thus, the vertical joints 18 can be fixed with friction forces to the inner wall 23 or to the projection 25, so the free oscillating length of the vertical tendons 18 can be reduced and unwanted transversal movements prevented. It is therefore possible to also execute very high towers 1 without an additional, active intermediate fastening of the tendons 18. In this case, the relevant concrete segment 7 or the prefabricated concrete part 9 can be very easily manufactured with the projection 25, as the projection 25 can be well integrated into the formwork. In addition, this also facilitates the assembly on the construction site because the vertical tendons 18 do not need any additional assembly steps for this intermediate fastening. Moreover, it is sufficient to fix the vertical tendons 18 in place on their head bearing, for example, unroll them downwards, and anchor them on their foot bearing. Here, the vertical tendons 18 are automatically guided above the projection 25 and fixed to it by friction after tensioning, in which a pressing force is created on the vertical tendons 18. Especially advantageous here is that such fixation of the vertical tendons 18 on a projection 25 can be used with different construction designs of tower sections 3 or towers 1. Thus, the adapted projection 25 cannot only be used in connection with annular one-piece concrete segments 7, but also with concrete segments 7 made up of several prefabricated concrete parts 9. In addition, it is also possible to provide such a projection 25 on an in-situ concrete tower.

(36) Here, only two vertical tendons 18 are shown as examples. It goes without saying that in a real tower section 3 at least three, generally many vertical tendons 18 are distributed across the inner circumference of the tower section 3. In this case, the vertical tendons 18 can be distributed equidistantly across the inner circumference or individual groups of vertical tendons 18 can be formed to be also equidistantly distributed across the inner circumference, whereas gaps between such individual groups occur. However, executions in which one vertical tendon 18 extends beside the next one so that the entire inner circumference of the tower section 3 is covered with vertical tendons 18 are also possible.

(37) According to the diagram shown here, the projection 25 is executed so it can extend circumferentially across the entire inner circumference of the tower section 3 or of the concrete segment 7. It can thus be used in any towers 1 with any number and arrangement of vertical tendons 18.

(38) This diagram also shows a tower section 3 in which only one projection 25 is provided on the inner wall 23. Needless to say, however, it is also possible to arrange another projection 25 vertically offset to the first projection 25 of the inner wall 23 in order to attain a better fixation of the vertical tendons 18 in very high towers 1 as a result of this. Furthermore, it goes without saying that this diagram showing only five concrete segments 7 should merely be understood as an example and that real tower sections 3 are built from considerably more concrete segments 7 or prefabricated concrete parts 9.

(39) FIG. 9 shows a cross section of a one-piece, annular concrete segment 7, which likewise has one projection 25 on its inner side 16. Contrary to the diagram of FIG. 8, the vertical tendons 18 are guided here under a deflection angle across the at least one projection 25. The abutment under a deflection angle makes it possible to exert extremely high pressing forces on the tendons 18, so that they are especially well fixed in place by high friction forces. Naturally, such a guidance of the vertical tendons 18 under a deflection angle is also possible in combination with segment prefabricated concrete parts 9 or an in-situ concrete tower.

(40) FIG. 10 shows an annular segment prefabricated concrete part 9, which together with additional annular segment prefabricated concrete parts 9, can be assembled to have one annular concrete segment 7. The annular segment prefabricated concrete part 9 also has (like the one shown in FIG. 7) one outer side 10, one inner side 16, two lateral contact faces 13 and an upper contact face 11. A lower contact face 12 (see FIGS. 2-4) is not visible in this diagram. The annular segment prefabricated concrete part 9, in turn, has on its inner side 16 a projection 25 that is preferably bracket- or flange-shaped (like the one shown in FIGS. 8 and 9) and preferably has a rectangular cross section. In this case, the edges of the rectangular cross section pointing towards the interior 24 are preferably rounded off to prevent the damaging effects of the projection 25 to the vertical tendons 18.

(41) Preferably, several of these annular segment prefabricated concrete parts 9 (according to this diagram, four such prefabricated concrete parts 9) are assembled to form one concrete segment 7, so that once again the result is one circumferential flange-like projection 25. However, it is also conceivableespecially if there are more than four annular segment prefabricated concrete parts 9 per concrete segment 7that merely one part of the annular segment prefabricated concrete parts 9 has such a projection. During the assembly of the tower section 3, these prefabricated concrete parts 9 are then arranged in such a way that the projections 25 run where the vertical tendons 18 should later be pulled in.

(42) FIG. 11 shows another embodiment of a prefabricated concrete part 9, in which a projection 25 executed in the shape of a bracket does not extend across the entire inner side 16. Such an embodiment can be suitable for demolding, for example, and contributes to the possibility that the lateral contact faces 13 can be flatly designed or processed (e.g. ground) in an especially easy way. Even here, it is conceivable once again to join several vertical tendons 18 together to groups, whereas the group of tendons 18 then extends into the area of the projection 25, whereas no vertical tendons 18 are arranged in the inner side 16 area outside the projections 25.

(43) FIG. 12 shows another embodiment of an annular segment prefabricated concrete part 9, in which several projections 25 are distributed at the same height, but across the inner circumference of the prefabricated concrete part 9, on the inner side 16. The projections 25 are, in turn, provided in the areas of the tower section 3, in which the subsequent arrangement of vertical tendons 18 is planned. Naturally, it would also be conceivable to provide one annular concrete segment 7 with such projections 25 distributed across the inner circumference.

(44) FIG. 13 shows another embodiment of an annular segment prefabricated concrete part 9 with several projections 25 across the inner circumference of the prefabricated concrete part 9 distributed on the inner side 16. However, on their side pointing to the tower's interior 24, the projections 25 are not flatly executed as those of FIG. 12, but have a concave recess pointing to the interior 24. Here, the tendons 18 lie on the deepest point of the concave recess and, as a result of this, are especially well fixed in their transversal direction or are automatically placed back after a possible displacement. Such a design is advantageous, especially with wire tendons.

(45) To sum up, the manufacturing of the present tower 1 with concrete segments 7 made up of several prefabricated concrete parts 9 is facilitated because the individual prefabricated concrete parts 9 can be easily positioned and no time-consuming connections of the vertical joints 8 or of the prefabricated concrete parts 9 of a concrete segment 7 are necessary. The casting-free assembly of the prefabricated concrete parts 9 to concrete segments 7 and of the concrete segments 7 to a tower section 3 of concrete can here be made easier by the highly precise production of the prefabricated concrete parts 9 as identical parts. Owing to the casting-free execution of the horizontal joints and vertical joints as well as the composite-free guidance of the vertical tendons, the tower's assembly, maintenance and dismantling are facilitated. In this case, the fixation of the vertical tendons 18 to the projection 25 contributes to the easy manufacturing of the concrete segments 7 or the prefabricated concrete parts 9 and to the easy assembly of the tower sections 3.

REFERENCE LIST

(46) 1 Tower

(47) 2 Foundation

(48) 3 Tower section of concrete

(49) 4 Tower section of steel

(50) 5 Transition piece

(51) 6 Horizontal joint

(52) 7 Concrete segment

(53) 8 Vertical joint

(54) 9 Prefabricated concrete part

(55) 10 Outer side

(56) 11 Upper contact face

(57) 12 Lower contact face

(58) 13 Lateral contact face

(59) 14 Contact area

(60) 15 Extra reinforcement

(61) 16 Inner side

(62) 17 Cladding tube

(63) 18 Vertical tendon

(64) 19 Screw connection

(65) 20 Screw

(66) 21 Dowel

(67) 22 Recess for screw connection

(68) 23 Inner wall

(69) 24 Interior

(70) 25 Projection

(71) H Height

(72) B Width

(73) Deflection angle