Abstract:
The invention concerns a pylon base section for arrangement and fixing on a foundation and for the erection of a pylon of a wind power installation thereon including an outer lower annular flange for placement on the foundation and for fixing to the foundation, an inner upper annular flange for placement and fixing of a pylon segment with a corresponding lower pylon flange thereon, an inner lower support flange for placement on the foundation, and inner support elements, in particular support struts, for supporting the upper annular flange relative to the lower support flange.

Description:
BACKGROUND 
       [0001]    1. Technical Field 
         [0002]    The present invention concerns a pylon base section for the erection of a wind power installation. The present invention further concerns a pylon base arrangement having a pylon base section. The present invention also concerns a pylon of a wind power installation and a method of erecting a pylon of a wind power installation. 
         [0003]    2. Description of the Related Art 
         [0004]    Wind power installations are generally known and are frequently erected on a pylon, as is also the case with the wind power installation shown in  FIG. 1 . Such a pylon of a wind power installation, namely a wind power installation pylon, is erected for that purpose on a suitable foundation. In that case care is also to be taken to provide for perpendicular orientation or levelling of the pylon. 
         [0005]    To prepare for erecting a wind power installation pylon it is known for a pylon base section to be partly concreted into the foundation in order to erect the further pylon thereon. Such a pylon base section is in the form of a cylindrical casing or frustoconical casing having an upper peripherally extending annular flange and is concreted into place in such a way that this upper annular flange remains outside the concrete foundation in order to erect the pylon, in particular a steel pylon, thereon. In that case the pylon base section can be held in the aligned or levelled position by a holding device while the concrete foundation is cast. As soon as the concrete has set such a pylon base section can be released from the holding device. Such a method however is intended in particular for smaller pylons and possibly requires later post-levelling on its upper annular flange. Another disadvantage in that respect is that this pylon base section has to be held by the holding device upon pouring and setting of the concrete. That kind of pylon base section can also involve problems in terms of erecting and thus anchoring very large wind power installation pylons. 
         [0006]    Another method involves concreting into place a foundation basket having a lower circular segment anchor and a plurality of perpendicular connecting bars arranged in a circular shape, wherein the connecting bars project upwardly from the downwardly disposed segment anchor to which they are connected, through the concrete, and upwardly at the surface of the concrete, where the surface of the concrete or foundation forms a circular fixing region, and the bars are in that case provided with a peripherally extending levelling ring. That levelling ring can be arranged and levelled off after the concrete has set in order to arrange a first pylon segment thereon in properly oriented relationship and to fix it in place. In that arrangement the connecting bars project with threaded portions through corresponding bores in a lower flange of the lower pylon segment and can be provided there with nuts for fixing purposes. 
         [0007]    A problem in that respect is that, when pouring the concrete, the connecting bars have to be oriented with a template or jig in the region of the concrete surface or foundation surface to be produced, so that the connecting bars are correctly arranged after the concrete has set and can extend without any problem through the large number of bores in the levelling ring to be arranged, and the flange of the lower pylon segment to be set in place. Such a method is thus complicated and expensive because firstly such a template or jig has to be set in place and, after the concrete has set, has to be replaced by the levelling ring. For that purpose the nut of each connecting bars has to be released to be able to remove the template or jig and then re-fitted after the levelling ring and the lower pylon segment has been set in position. An arrangement with a levelling ring is to be found in German patent application DE 10 2004 017 006 A1. 
         [0008]    A problem with that use of a foundation basket with a lower segment anchor and a levelling ring is also that, if the foundation basket is constructed incorrectly or imprecisely, the result can be inclinedly extending connecting bars which can also be referred to as bolts. That can cause problems in further connection of the levelling ring and the first pylon segment to be placed thereon. One cause can involve defective use of an upper template or jig for orienting the bolts. 
       BRIEF SUMMARY 
       [0009]    One or more embodiments of the present invention is to address at least one of the above-mentioned problems. In particular, one embodiment of the invention seeks to propose a solution for improving a pylon base foundation of a wind power installation pylon. Additionally or alternatively the invention seeks to provide that the structure and arrangement of a foundation basket is simplified and/or is less susceptible to defects. One embodiment at least seeks to propose an alternative solution. 
         [0010]    According to one embodiment of the invention there is proposed a pylon base section as set forth in claim  1 . Such a pylon base section is adapted for arrangement and fixing on a foundation and for the erection of a pylon of a wind power installation thereon. The pylon base section includes an outer lower annular flange for placement on the foundation and for fixing to the foundation. In addition there is provided an inner upper annular flange for placement and fixing of a pylon segment with a corresponding lower pylon flange thereon. In particular that inner upper annular flange (reference is also made thereto hereinafter for the sake of simplicity as the upper annular flange) substantially corresponds to a corresponding lower pylon flange in terms of size and nature and number of bores for passing fixing bolts therethrough. 
         [0011]    The pylon base section also has an inner lower support flange for placement on the foundation, wherein that inner lower support flange is also in the form of an annular flange and in particular for the sake of easier understanding is referred as the support flange. In particular the outer lower annular flange and the inner lower support flange are arranged in mutually adjacent relationship and have a common surface in the form of a circular ring to be arranged and placed on the foundation or on a levelling layer on the foundation. In that respect, the term placement on the foundation is used to mean that the pylon base section sits in particular in the finished condition on the foundation. Placement on the foundation is not to be interpreted so narrowly that it is only after complete construction of the foundation that the pylon base section is arranged and placed thereon. Rather this specification will later describe in detail how the pylon base section preferably achieves its position on the foundation. 
         [0012]    In addition there are provided inner support elements, in particular support struts, for supporting the upper annular flange relative to the lower support flange. Those support elements are thus disposed between the upper annular flange and the lower support flange and are adapted to transmit a force which acts on the upper annular flange, in particular due to the pylon applying a loading thereto, at least partially to the lower support flange and thus accordingly to the foundation. In addition or alternatively those support elements are intended and are suitable for carrying a bracing force by means of corresponding fixing elements which can act between the inner upper annular flange and the lower support flange when they are braced directly or indirectly relative to each other. 
         [0013]    In an embodiment the pylon base section is characterized by an annular casing portion connecting the lower annular flange and the lower support flange to the upper support flange. In particular the casing portion defines an outer region and an inner region. The outer and inner regions basically correspond to an outer and inner pylon region respectively of the wind power installation pylon to be erected. In that case the lower outer annular flange is arranged in the outer region and is thus also visible and accessible from outside the pylon to be erected. In contrast the upper annular flange, the lower support flange and the support elements are arranged in the inner region, that is to say, after erection of a wind power installation pylon, in the interior of the pylon. Preferably the height of the casing portion is 0.2 meters (m) to 2 m, preferably 0.5 m to 1.5 m and particular preferably 0.75 m. That correspondingly involves a spacing of the upper annular flange relative to the lower support flange at one of those respective sizes. When the pylon base section is arranged on the foundation therefore the inner upper annular flange is arranged at approximately that height, that is to say in the range of 0.2 m to 2 m, or 0.5 m to 1.5 m or at 0.75 m. In that way that inner upper annular flange is also at a suitably pleasant and practicable working height for a member of a construction team who is standing on the foundation. 
         [0014]    A further configuration provides a pylon base section characterized in that the support elements are in the form of vertical support ribs, wherein in particular the upper annular flange and the lower support flange have a plurality of bores for passing therethrough fixing screws or fixing bolts and each support rib is respectively fixed to the upper annular flange between two of the bores and to the lower support flange also between two of the bores which more specifically correspond to the respective upper two bores. Thus when fixing screws or fixing bolts are respectively passed in the appropriate required fashion through a bore in the lower support flange and the upper annular flange at least one respective fixing screw or fixing bolt is arranged between two support ribs. When now the fixing screws or bolts are tightened and exert a tensile force which also leads to a tensile force between the lower support flange and the upper annular flange the support ribs can counteract that force and correspondingly counteract deformation of the two flanges. 
         [0015]    In a configuration there are no bores between some support ribs, in particular there can be more support ribs than corresponding bores. 
         [0016]    According to one embodiment of the invention there is also proposed a pylon base arrangement which includes a pylon base section, namely a pylon base section according to one embodiment as described hereinbefore. In addition the pylon base arrangement includes a foundation basket having inner and outer fixing bolts for anchoring with one respective side in a foundation and for fixing with another respective side at the pylon base section. The inner fixing bolts in that case are longer approximately by the height of the pylon base section than the outer fixing bolts. At least the inner fixing bolts are longer in respect of their operative length by the height of the pylon base section than the outer fixing bolts. Accordingly in particular the fixing bolts are to be arranged in the foundation at the same height and are thus fixed after the concrete has set, more specifically in particular at an approximately horizontally arranged segment anchor peripherally extending in a circular shape. In that arrangement the outer fixing bolts extend from the segment anchor to and through the outer lower annular flange. The inner fixing bolts extend from the segment anchor to and through the inner lower support flange and also to and through the inner upper annular flange. After a lower pylon segment has been arranged on the pylon base section with a lower pylon flange the inner fixing bolts also still project through that lower pylon flange of the lower pylon segment. The effective length of the connecting bolts is that which is necessary to produce a connection between the segment anchor and the outer lower annular flange and between the segment anchor and the inner upper annular flange. Upon very close consideration, in the latter case, that is to say for the inner connecting bolts, the thickness of the lower pylon flange of the lower pylon segment to be set in place is also added. 
         [0017]    In an embodiment of the pylon base arrangement therefore the outer fixing bolts are passed for fixing to the pylon base section through bores in the outer lower annular flange and the inner fixing bolts are passed through bores in the inner lower support flange and through bores in the upper inner annular flange. In that case the inner fixing bolts are intended to be adapted for fixing a pylon segment to be set in place with a lower pylon flange on the inner upper annular flange in order in that case more specifically to be passed through bores in the lower pylon flange. 
         [0018]    A further configuration of a pylon base arrangement according to one embodiment of the invention provides a plurality of connecting bolts for connecting the pylon base section to a lower pylon segment placed on the pylon base section. In this case the connecting bolts extend through the inner upper annular flange and the corresponding lower pylon flange of the fitted pylon segment. In particular the connecting bolts do not extend into the foundation. Such a pylon base arrangement thus has outer fixing bolts which extend into the foundation for anchoring the outer lower annular flange. In addition there are inner fixing bolts which extend from the lower pylon flange of the fitted pylon segment further through the inner upper annular flange and from there further through the inner lower support flange into the foundation. In addition to those inner and outer fixing bolts there are provided connecting bolts which connect the inner upper annular flange to the lower pylon flange and are preferably also of a correspondingly short configuration. Basically therefore those connecting bolts extend through those two flanges which bear against each other, namely the inner upper annular flange and a lower pylon flange, and accordingly at both ends still have sufficient space for arranging a respective clamping means such as a clamping nut. Such a clamping nut can also be referred to as a nut for simplification purposes. 
         [0019]    Preferably connecting bolts and fixing bolts which both respectively extend through the inner upper annular flange and the lower pylon flange alternate. Thus in relation to a peripheral direction, the lower pylon flange of the lowermost fitted pylon segment is alternately anchored in or braced in relation to the foundation on the one hand with an inner fixing bolt and on the other hand is fixed to or braced in relation to the inner upper annular flange with a connecting bolt. In other words, long inner fixing bolts and short connecting bolts alternate in the interior of the pylon base arrangement. 
         [0020]    It is also possible to provide more inner fixing bolts than connecting bolts or vice-versa. In addition or alternatively inner fixing bolts on the one hand and connecting bolts on the other hand can also be arranged in pair-wise relationship so that in the peripheral direction two connecting bolts follow two inner fixing bolts and the two connecting bolts are in turn followed by two inner fixing bolts and so forth, to give just one further example. 
         [0021]    For the use of connecting bolts which therefore do not extend through the inner lower support flange, it is also possible to use a pylon base section which is also intended for a pylon base arrangement without connecting bolts. In other words it is also possible to use for this embodiment, being a pylon base arrangement which uses connecting bolts, a pylon base section which in its inner upper annular flange has as many bores as in its inner lower support flange. Then some bores in the inner lower support flange would not have any bolt passing therethrough and in that respect would remain empty. Naturally such bores which remain empty in that respect can however be filled with a filling material if that is desired. 
         [0022]    Alternatively it is possible to use a pylon base section which is specifically designed and adapted for a pylon base arrangement which uses connecting bolts. 
         [0023]    A pylon base arrangement which uses connecting bolts can thus provide for the application of force from the pylon, in particular from the lower pylon segment, into the foundation, in two ways. The transmission of force, that is to say in particular tensile forces, can thus be implemented on the one hand from the lower pylon segment directly by way of the inner fixing bolts into the foundation. In addition, such forces can be in part passed to the pylon base section by way of the connecting bolts and from the pylon base section further by means of the outer fixing bolts into the foundation. In that respect, such anchorage in the foundation is possible with a comparatively low level of material expenditure, in particular as regards the number of bolts and bracing means such as bracing nuts. A comparatively small number of bracing means such as bracing nuts can also reduce the complication and expenditure when erecting such a pylon base arrangement. 
         [0024]    Preferably a pylon base arrangement has as many outer fixing bolts as inner fixing bolts and/or it has as many outer fixing bolts as inner fixing bolts and connecting bolts together. 
         [0025]    In addition there is proposed a pylon of a wind power installation according to claim  10 . It has a foundation having a foundation basket with outer and inner fixing bolts and with a pylon base section according to one of the above-described embodiments. The pylon further has a lower pylon segment, in particular a steel pylon segment, with a lower pylon flange. In that arrangement the lower pylon segment is disposed with its pylon flange on the pylon base section. Some of the fixing bolts, in particular the inner fixing bolts, are passed from the foundation through the inner lower support flange and through the inner upper annular flange of the pylon base section and through the lower pylon flange in order thereby to arrange the lower pylon flange on the pylon base section and to fix it to the foundation. Fixing is effected in particular by screwing and tightening fixing nuts on the fixing bolts which project upwardly through the lower pylon flange. 
         [0026]    Thus the inner fixing bolts provide for directly fixing or bracing the lower pylon segment to the foundation, in particular a segment anchor provided in the foundation. In this case the pylon base section is arranged between the foundation and the pylon segment and the inner connecting bolts thus project completely beyond the pylon base section. 
         [0027]    According to another embodiment of the invention there is proposed a method of erecting a pylon of a wind power installation, in particular a steel pylon, according to claim  12 . This accordingly firstly involves positioning a foundation basket connected to a pylon base section in a foundation excavation prepared for pouring a foundation. Concrete can then be poured into the foundation excavation for partially concreting the foundation basket in place. In that case the pouring operation is preferably effected as far as possible in such a way that a concrete surface, that is to say a foundation surface, is produced somewhat shortly below the pylon base section, namely shortly below the lower flanges of the pylon base section. Preferably there should be just so much space remaining between the concrete surface and the underside of the pylon base section, that levelling by a levelling material or compensating material can still be effected. 
         [0028]    The concrete will then set and after the concrete has set construction of the pylon can be continued, or, depending on the respective way in which the situation is considered, such construction can be begun. One of the next steps in constructing the pylon is placement and fixing of a lower pylon segment. Depending on the respective size of the pylon the lower pylon segment can also be the sole pylon segment on which then a wind power installation pod or at least an azimuth bearing is fitted. 
         [0029]    Preferably the method of erecting a pylon of a wind power installation uses a pylon base section in accordance with one of the described embodiments. Preferably the pylon basket is connected to the pylon base section in the positioning operation by way of fixing bolts. In that case inner fixing bolts are passed through bores in the upper inner annular flange and fixed there with fixing means, in particular suitable nuts. 
         [0030]    Preferably the pylon base section is held by a crane or a carrier frame set up in the foundation excavation, in the operation of pouring the concrete, whereby in addition the foundation basket which is fixed to the pylon base section is also held. In that case the foundation basket is basically suspended from the pylon base section. 
         [0031]    Preferably the pylon base section is levelled after the concrete has set. The pylon base section is thus oriented straight to permit the pylon to be constructed as exactly vertically as possible. For that purpose for example a self-levelling material can be applied to the foundation beneath the two lower flanges of the pylon base section and, after the self-levelling levelling material has hardened, the pylon base section can be set down thereon. Alternatively the pylon base section as such can be levelled off and the levelled-off position of the pylon base section can be fixed by a suitable compensating material. In this case also that compensating material is to be arranged in the region between the foundation and the lower flanges of the pylon base section in order to harden there in the levelled position. Optionally, depending on the respective concrete foundation, it is possible to dispense with the levelling operation, or levelling can be effected without the compensating or levelling material. In that case the pylon base section stands directly on the foundation. The outer fixing bolts can then be fixedly braced, namely in particular with suitably fitted nuts. In the case of the inner fixing bolts, upper nuts can now be released and a lower pylon section can be placed with a lower pylon flange on the pylon base section, in which case the inner fixing bolts are passed through bores in the lower pylon flange and then can be firmly tightened by suitable nuts. 
         [0032]    This therefore provides that at any event the outer nuts, namely the nuts of the outer fixing bolts, no longer have to be also released after pouring of the concrete and after the levelling-off operation, but only still have to be tightened. This can therefore eliminate replacement of a template or jig. The pylon base section can be held without a crane in the concrete pouring operation, or requires only a very small crane so that this can reduce corresponding costs for crane time. In that procedure a pylon base section is arranged between the foundation and the lower pylon segment, and is fixed together with the lower pylon segment to the foundation at any event in the inner region, in particular being fixedly braced thereto. The proposed solution avoids at any event in the inner region fixing of the pylon base section to the foundation on the one hand and fixing of the lower pylon section to the pylon base section on the other hand. It is thus possible here to save on two sets of nuts and the corresponding working time for arranging them and screwing them tight. In particular it is possible here to achieve a reduction in complication and expenditure and also material. 
         [0033]    In particular placement and fixing of a lower pylon segment are effected in such a way that the fixing means, therefore in particular nuts, are removed from the inner fixing bolts, the lower pylon segment is placed with a lower pylon flange on the inner upper annular flange of the pylon base section and in that case the inner fixing bolts are passed through bores in the lower pylon flange. The fixing means, in particular fixing nuts, are then screwed onto the inner fixing bolts projecting through the pylon flange in order to pull the pylon flange fixedly onto the upper inner annular flange of the pylon base section. 
     
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
         [0034]    The invention is described in greater detail hereinafter by way of example by means of embodiments with reference to the accompanying Figures. 
           [0035]      FIG. 1  shows a perspective view of a wind power installation, 
           [0036]      FIG. 2  shows a sectional view through a part of a pylon base arrangement according to an embodiment of the invention, 
           [0037]      FIG. 3  diagrammatically shows a perspective view of a pylon base section without pylon, without foundation and without foundation basket, 
           [0038]      FIG. 4  diagrammatically shows a perspective view of a pylon base section with foundation basket and with a pylon flange, 
           [0039]      FIG. 5  diagrammatically shows a pylon base section with foundation basket and a peripherally extending compensating layer for levelling purposes, wherein the concrete on which the compensating layer is arranged is not shown, 
           [0040]      FIG. 6  diagrammatically shows a perspective view of a pylon base section which is appropriately arranged on a foundation and a compensating layer, and 
           [0041]      FIG. 7  shows a sectional view through a part of a pylon base arrangement according to a further embodiment. 
       
    
    
     DETAILED DESCRIPTION 
       [0042]    Hereinafter the same references are possibly used for similar but non-identical features to improve understanding of the functionality of the respective components. 
         [0043]      FIG. 1  shows a wind power installation  100  comprising a pylon  102  and a pod  104 . Arranged on the pod  104  is a rotor  106  having three rotor blades  108  and a spinner  110 . In operation the rotor  106  is caused to rotate by the wind and thereby drives a generator in the pod  104 . 
         [0044]    The pylon base arrangement  2  in  FIG. 2  includes a pylon base section  1  and a pylon basket  4  which can also be referred to as a bolt basket. 
         [0045]    The pylon base section  1  includes an outer lower annular flange  6 , an inner upper annular flange  8  and a lower inner support flange  10  which is also in the form of an annular flange. The outer lower annular flange  6  and the lower inner support flange  10  basically together form a lower annular base portion  12 . That lower annular base portion  12  can be made from one piece, in particular of steel, and has a lower support surface  14  with which the pylon base section  1  stands on an annularly arranged compensating layer  16  which in turn is arranged on a foundation  18 . 
         [0046]    The lower annular base portion  12  is connected to the upper inner annular flange  8  by way of an annular casing portion  20 . The annular casing portion  20  is almost in the form of a cylindrical casing, but differs therefrom by virtue of a conical configuration and thus corresponds to a frustoconical peripheral casing. The lower annular base portion  12 , the annular casing portion  20  and the upper inner annular flange  8  are provided in  FIG. 2  with different hatchings in the illustrated sectional view. Nonetheless those three portions  12 ,  20  and  8  are fixedly connected together, in particular by welding. All three portions  12 ,  20  and  8  can be made from steel and they can be in the form of a common casting. 
         [0047]    The pylon base section  1  in  FIG. 2  also has support elements  22  of which five support elements  22  are shown in  FIG. 2 . The support elements  22  can also be referred to as support struts or reinforcing plates. The support elements  22  are disposed between the upper inner annular flange  8  and the lower inner support flange  10  and are fixedly connected to both and to the annular casing portion  20 , in particular by welding, or are produced jointly as a casting. Forces acting on the upper inner annular flange  8  can be transmitted by way of those support elements  22  and also the annular casing portion  20  to the lower annular base portion. In particular such forces are passed from the support elements  22  to the lower inner support flange  10  and are also passed from the annular casing portion  20  to the lower annular base portion or the outer lower annular flange. 
         [0048]    The foundation basket  4  includes a multiplicity of inner bolts  24  and outer bolts  26 . The inner bolts  24  and the outer bolts  26  are respectively arranged in an annular row in the foundation  18  and are fixed at a lower end to a segment anchor  28  which also correspondingly peripherally extends in an annular configuration in an approximately horizontal plane in the foundation  18  and which can also be referred to as the anchor ring. Arranged on the upper inner annular flange  8  and thus on the pylon base section  1  is a lower pylon flange  30  which forms a lower part of an indicated lower pylon section  32 . 
         [0049]    The foundation basket  4  is now of such a structure that the inner bolts  24  extend from the segment anchor  28  through the foundation  18  upwardly through the compensating layer  16 , the inner lower support flange  10 , the upper inner annular flange  8  and finally through the lower pylon flange  30 . Those inner bolts  24  which are in the form of threaded bolts are fixed to the segment anchor  28  by means of nuts  34 . The lower pylon flange  30  is thus braced in relation to the segment anchor  28  with further nuts  36  which can be identical to the nuts  34 . In that way a pylon of which the lower pylon section  32  is indicated in  FIG. 2  is also fixedly connected to the segment anchor and thus the foundation. 
         [0050]    The outer bolts  26  are also fixed to the segment anchor  28  with nuts  34  and project upwardly through the foundation  18 , through the compensating layer  16  and through the outer lower flange  6  to which they are fixed by means of nuts  36 . 
         [0051]      FIG. 3  shows a diagrammatic perspective view of a pylon base section  1 . This pylon base section  1  substantially corresponds to the pylon base section  1  shown in the sectional view in  FIG. 2 . It will be seen from  FIG. 3  that the support elements  22  are in the form of support struts or reinforcing plates and are respectively arranged in the region of the lower inner support flange  10  and the upper inner annular flange  8  between two respective bores  38 . In this case there are two respective bores  38  on the lower inner support flange  10  and the upper inner annular flange  8 , disposed between two support elements  22 . In other words there is a respective support element  22  after each second bore  38 . The pylon base section can also be made in the form of a casting, in particular a steel casting. 
         [0052]      FIGS. 4 to 6  basically show a perspective view of the same pylon base arrangement  2 , wherein that shown in  FIG. 6  is appropriately cast into a concrete foundation  18  and in that case rests with its lower annular base portion  12  on a compensating layer  16 . 
         [0053]    The concrete is not shown in the view in  FIG. 5 , but is shown in the view in  FIG. 6 . In addition the compensating layer  16  is not shown in the view in  FIG. 4 . 
         [0054]    Each of  FIGS. 4 to 6  also shows a lower pylon flange  30  with the attachment of a lower pylon section  32 . The largest part of the pylon section  32  is cut out in order to more clearly show the details of the pylon base arrangement  2 . 
         [0055]    One or more embodiments described thus makes it possible to achieve a simpler and more secure and reliable structure for the foundation baskets and assembly times can be reduced. It is possible to provide for pre-assembly of the foundation basket with steel segment without templates or jigs so that the operation of removing the templates or jigs can be eliminated. Damage to the foundation and thus restoration operations on the foundation can be avoided by virtue of a simpler and more reliable and in particular also better reproducible structure for the foundation basket. 
         [0056]      FIG. 7  shows a section through a pylon base arrangement  70  according to a further embodiment. This sectional view in  FIG. 7  substantially corresponds to the sectional view in  FIG. 2 . The same components are also entirely similar or even identical and in that respect identical references are used here for similar or even identical components although the base arrangement  70  as such differs from the base arrangement  2  in  FIG. 2 , as follows. 
         [0057]    Instead of the inner fixing bolt  24  in  FIG. 2 ,  FIG. 7  shows a connecting bolt  72 . The connecting bolt  72  is markedly shorter than the inner fixing bolt  24  in  FIG. 2 . The connecting bolt  72  extends through the lower pylon flange  30  and the upper inner annular flange  8 . Those two flanges  30  and  8  are thus fixedly connected together or braced relative to each other by the connecting bolts  72 . For that purpose the connecting bolt  72  has two screw nuts or bracing nuts  36 . A tensile force from the lower pylon section  32  can be passed in the illustrated region by way of the lower pylon flange  30 , the connecting bolt  72 , the upper inner annular flange, the annular casing portion  20  of the pylon base section  1  to the outer lower annular flange  6  and from there further to the foundation  18  by means of the outer bolt  26 . 
         [0058]      FIG. 7  shows a sectional view of a connecting bolt  72 . Such connecting bolts  72  alternate with inner bolts  24 , in accordance with the illustrated pylon base arrangement  70 . Therefore the sectional view in  FIG. 2  also shows a pylon base arrangement  70  to which  FIG. 7  relates, namely for all the sections which are made in the region of an inner bolt  24 . 
         [0059]    At the locations at which a connecting bolt  72  in accordance with the pylon base arrangement  70  is used, a bore both in the lower inner support flange  10  and also in the segment anchor  28  can remain unused and possibly filled, or the lower inner support flange  10  and/or the segment anchor  28  can be correspondingly provided, but without a bore. 
         [0060]    The various embodiments described above can be combined to provide further embodiments. All of the U.S. patents, U.S. patent application publications, U.S. patent application, foreign patents, foreign patent application and non-patent publications referred to in this specification and/or listed in the Application Data Sheet are incorporated herein by reference, in their entirety. Aspects of the embodiments can be modified, if necessary to employ concepts of the various patents, application and publications to provide yet further embodiments. 
         [0061]    These and other changes can be made to the embodiments in light of the above-detailed description. In general, in the following claims, the terms used should not be construed to limit the claims to the specific embodiments disclosed in the specification and the claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which such claims are entitled. Accordingly, the claims are not limited by the disclosure.