Patent Publication Number: US-2022235741-A1

Title: Tool arrangement for unloading a tower or a tower segment from a transportation vehicle and/or for storing the tower or the tower segment

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority to PCT Application No. PCT/EP2020/058330, having a filing date of Mar. 25, 2020, which is based off of EP Application No. 19172804.7, having a filing date of May 6, 2019, the entire contents both of which are hereby incorporated by reference. 
    
    
     FIELD OF TECHNOLOGY 
     The following relates to a tool arrangement for unloading a tower or a tower segment from a transportation vehicle and/or for storing the tower or the tower segment. 
     BACKGROUND 
     Many tower structures, especially tower structures of wind turbines, are pre-casted or comprise several pre-casted towers or tower segments. After the tower or tower segment has been brought to the construction site by a transportation vehicle like a truck or the like, the tower or tower segment is typically unloaded from the transportation vehicle using two cranes. The cranes hoist the tower or tower segment from the truck by ropes or chains or the like. After hoisting the tower or tower segment by the cranes, the truck drives away and the tower or tower segment is lowered by the cranes and set down directly on the ground or on, especially chock-like, tower feet or the like. 
     SUMMARY 
     An aspect relates to provide a system for a simplified unloading of the tower or the tower segment from the transportation vehicle and/or for storing the tower or the tower at the construction site. 
     An aspect relates to a tool arrangement as initially described, which comprises a bottom tool device with an attachment means or attachment to removably attach the bottom tool device to a bottom mounting section of the tower or the tower segment, wherein the tool arrangement further comprises a top tool device with an attachment means or attachment to removably attach the top tool device to a top mounting section of the tower or the tower segment, wherein the bottom tool device and the top tool device each comprise a lifting means to lift the tower or the  tower segment, when the tower or the tower segment is in a non-erected position and attached to the respective tool device. 
     Typically, tower structures, especially of wind turbines, consist either of only one pre-cased tower or of several pre-casted tower segments which are attached to each other at their front ends. While in the following only the word “tower” is mentioned, the whole disclosure refers to tower segments as well. 
     To be connected to the ground, to a nacelle of the wind turbine or to each other, each of the towers typically comprises the bottom mounting section and a top mounting section. These mounting sections can be flange-like protrusions located on the tower wall on the top or bottom forehead of the tower directing radially inwards and can comprise several holes. The mounting sections are typically adapted to be connected with another mounting section of an adjacent tower segment or, if the bottom mounting section belongs to the undermost tower, to the ground or, if the top mounting section belongs to the uppermost tower, to the bottom of the nacelle of the wind turbine by connection means, e.g., bolts and nuts. 
     Typically, as already mentioned, before getting transported to the construction site, the tower is loaded on a truck by clamping the tower between two trailers of the truck or attaching it on a trailer of the truck by, e.g., tension belts or the like. Already after loading the tower on the truck, the top tool device can be attached to the top mounting flange of the tower and the bottom tool device can be attached to the bottom mounting flange. 
     After arriving at the construction site, the lifting means of the top tool device and the bottom tool device is brought in contact with the ground and can be used to lift the tower so that the weight of the tower weighs on the tower lifting means but not on the transportation vehicle. So in this situation, only the lifting means and not the tower is in contact with the ground. After this, the unloaded truck can drive away. Hence, no crane for unloading the tower is required. Furthermore, in this position the tower can be stored temporarily on the construction site in the non-erected position without the need of the truck or cranes or the like but only being supported by the bottom tool device and the top tool device. 
     The bottom/top tool device and the respective mounting flange are attached to each other during the unloading process and during the storage of the tower on the construction site. Hence, the forces acting on the tower only act on the respective mounting flanges, especially not on contact areas between the tower and a rope or chain or, especially chock-like, tower feet, which could potentially lead to an unwanted deformation and/or scratching of the tower.  
     Each lifting means can be or can comprise at least two extendable pillars. While the tower is still loaded on the truck and the tool devices are attached to the respective mounting flanges, the extendable pillars can be extended downwards on the ground to lift the tower. The tower can be lifted just a few centimetres or decimetres. After this, the unloaded truck can drive away, i.e., when the tower is lifted, the truck can drive beneath the tower, along the longitudinal axis of the tower, between two extended pillars until he has completely left the area of the tower. 
     The pillars can be arranged at the sides of the bottom tool device and the top tool device. In this embodiment, the distance between the pillars is typically large enough to ensure a safe storage of the tower, e.g., wind or the like cannot upset the tower together with the tool devices easily. 
     The bottom tool device and/or the top tool device can comprise at least two vertical beams, wherein the pillars are extendable from the vertical beams. The vertical beams can be hollow and can, at least partially, house the pillars. The vertical beams can be attached to or part of a frame of the bottom tool device and/or the top tool device. 
     In an embodiment of the invention, on each pillar a foot plate of the lifting means is movably, especially pivotably, attached. The foot plate can be attached to the respective pillar by a joint, especially by a hinge joint or a ball joint. The foot plate can be tilted about one axis, which is perpendicular to a longitudinal axis of the respective pillar. Alternatively, the foot plate can also be tilted about two axes standing perpendicular to each other and to the longitudinal axis of the respective pillar. During extending the pillars, when the foot plate gets in contact with the ground, the alignment of the foot plate is automatically adapted to a possible unevenness of the ground. 
     The bottom tool device and/or the top tool device can comprise pneumatic or hydraulic or electric means for operating and/or positioning the attachment means and/or for operating the lifting means. A control device for controlling the operation of the pneumatic or hydraulic or electric means can be provided. The control device can be configured to generate respective control commands depending on signals from an input device, e.g., from a non-portable input device attached to the respective tool device or a portable input device, e.g., a mobile phone, tablet or the like. 
     To erect the tower from a lying into a standing position, i.e., from the non-erected position into an erected position, so far two fastening bases have been screwed to each of the typically flange-like mounting sections. Then, ropes or the like have been attached to the fastening bases and the tower has been erected by two cranes, i.e., one crane for each mounting section of the tower. Typically, both cranes have lifted the tower a bit and then the crane on the  mounting section on the upper side of the tower has hoisted the tower to erect it. Lifting the tower on its lower side has been required to avoid the tower or the tower segment being deformed or damaged during the erecting process. 
     To simplify the erection procedure of the tower, the bottom tool device can comprise a first device section with the attachment means and a second device section adapted to be arranged on the ground and being attachable or attached to the first device section, wherein the bottom tool device can comprise a pivot axis at least when the first and the second device sections are attached to each other, wherein the tower or the tower segment, when fixed to the bottom tool device, is pivotable around the pivot axis for being pivoted from the non-erected position to the erected position, wherein, when the tower or the tower segment is fixed to the bottom tool device, the pivot axis can be perpendicular to the longitudinal axis of the tower or the tower segment. 
     The first device section and/or the second device section can be or can comprise a plate and/or a frame with several beams. 
     While the first device section of the bottom tool device can be attached to the bottom mounting section of the tower, the second device section of the bottom tool device can be located on the ground of the respective construction site comprising a paved or gravelled or another suitable ground. 
     The first device section and the second device section can be attached or attachable to each other, providing a pivot or rotation axis. Since the first device section can be attached to the bottom mounting section of the tower and the second device section can be arranged on the ground, where the tower will be erected, there is no further safety arrangement required to secure the tower on its bottom side against slipping away or being damaged during the erecting process. Especially, for this purpose no crane is needed to hang up the tower on its bottom mounting section for the erecting process. 
     The pivot axis is perpendicular to the longitudinal axis of the tower and parallel to the plane defined by the ground. Thus, hoisting the tower, e.g., by a crane lifting the top section of the tower via a rope connected to the top mounting section, leads to a defined rotation of the tower about the pivot axis during the erecting process. Since there is only one crane needed to bring the tower from the non-erected position to the erected position, i.e., from a lying position to a standing position, embodiments of the present invention provide a simpler and cheaper opportunity to erect the tower compared to the previous method using two cranes. 
     The first device section and the second device section can be attached to each other non-detachably. In this embodiment, the bottom tool device can be brought into a space-saving  folded state by pivoting the second device section about the pivot axis. In an embodiment, both device sections can be removably attached to each other. During the transportation of the tower, wherein the first device section can be already mounted on the tower, the second device section can be transported independently from the first device section. 
     Axis forming means can be arranged at the first and the second device section, which axis forming means engage with each other when the first device section is attached to the second device section building the pivot axis. Components, which are attached to the first and/or the second device section or which are part of the first and/or the second device section can be used for this purpose. The geometrical shape of these components can allow these components to act together in such a way that the first device section and the second device section can rotate relatively to each other around the pivot axis. 
     The axis forming means can comprise a rod or at least two separate pins arranged at the first or the second device section and a rod or pin support arranged at the second or the first device section, wherein the rod or the pins engage in the rod or pin support building the pivot axis. The vertical direction along the rod or pin is moved while getting inserted into the rod or pin support can be perpendicular to the longitudinal axis of the rod or the pin. The rod or pin support can be U-shaped to hold the respective rod or pin regarding the horizontal direction. The pivot axis is defined by the longitudinal axis of the rod or the pin. 
     The axis forming means can comprise rolling element bearings or wheels interacting with round, especially cupped, support sections. 
     In an embodiment of the invention, the second device section is attachable to the first device section by arranging the second device section on the ground beneath the first device section and bringing the pillars of the lifting means of the bottom tool device from the extended state to the non-extended state. Besides allowing the tower to be unloaded from the truck and stored easily, in this embodiment the pillars furthermore allow the first device section and the second device section to be attached to each other. For this the second device section can be positioned under the first device section. Exemplarily, the rod or pin support of the second device section can be positioned vertically below the rod or pins of the first device section. Then, retracting the pillars leads to a down-motion of the tower or the tower segment together with the first device section. During this process, the rod or pins are inserted into the respective rod or pin support of the second device section, which is U-shaped with its opening directing upwards. 
     In an embodiment of the present invention, the second device section can comprise a ground plate or frame with several ground spikes protruding from the plate or frame for fixing the plate or frame to the ground. During the erecting process of the tower, horizontal forces can  occur acting on the second device section. Although mostly the friction between the second device section and the ground is large enough to avoid a slipping of the bottom tool device, the spikes sticking into the ground lead to a stabilisation regarding a possible horizontal slipping of the second device section. The spikes can be sticked into the ground by applying a vertical force to the second device section before erecting the tower and/or by the weight of the second device section and/or by the weight of the tower while being erected. 
     The top tool device can be adapted to be coupled to a hoisting means, especially to a rope or a chain. Although the hoisting means, i.e., the rope or the chain or the like, can be mounted directly to the top mounting section of the tower to lift or erect the tower by a crane, coupling the top tool device to the hoisting means ensures a safe attachment of the tower to the hoisting means and a uniform force distribution acting on the top mounting section while erecting the tower. 
     The top tool device can comprise a first hoisting fastener and a second hoisting fastener to connect the top tool device to the hoisting means to hoist the tower or the tower segment attached to the top tool device. To avoid a vertical tilt of the tower hanging on the hoisting means after erecting the tower, the first hoisting fastener and the second hoisting fastener can be positioned along a diameter of the circular cross section of the tower being connected to the top tool device. 
     The attachment means of the bottom tool device and/or of the top tool device can comprise a first attachment device and a second attachment device, wherein the relative position between the first attachment device and the second attachment device is adjustable. It is possible that the position of only one attachment device is adjustable and the other attachment device is located at a fixed position regarding of the top tool device. In an embodiment, the position of both attachment devices can be adjusted. By adjusting the relative position between the first attachment device and the second attachment device, towers with different diameters can be attached to the respective tool device. The relative position between the first attachment device and the second attachment device are adjustable such that the attachment devices can be attached to the respective mounting flange of the tower on opposite positions of the mounting flange. 
     The attachment devices can be clamping devices. Clamping the attachment devices to the, especially flange-like, mounting section of the tower provides a simple but also reliable connection between these components. The attachment devices can also be or comprise connecting means or connectors like bolts or screws or the like. Each clamping device can comprise a first clamping part and a second clamping part adapted to clamp the bottom mounting section or the top mounting section, especially the respective mounting flange, of the tower or the tower section in between.  
     The first device section of the bottom tool device and/or the top tool device can be or can comprise an especially horizontal, main beam, wherein the first attachment device and/or the second attachment device is, along a longitudinal main beam axis, movably mounted on the main beam. Both attachment devices are movably mounted on the main beam. The main beam can act as a guiding rail for the attachment devices, wherein guiding means or a guide between the main beam and the respective attaching device like, e.g., sliding shoes or the like, can be provided. 
     Assuming that the respective tool is attached to the tower being in the non-erected position, the main beam can be, with respect to the ground, positioned at an elevated position. In this embodiment, the tool can be used together with supporting feet, which are often used as supporting means or support for towers in the non-erected position. Such supporting feet typically comprise a plain contact area adapted to rest on the ground and an arched or two chock- like contact areas (matching the tower diameter) adapted to support the tower. The tool device can be attached to the respective mounting section of the tower even while it is stored on supporting feet. Although such supporting feet are obsolete by using a tool arrangement according to embodiments of the present invention, supporting feet are and will probably still be used widely. 
     The first device section of the bottom tool device and/or the top tool device can be or comprise a V-shaped beam arrangement with a first beam and a second beam, wherein the first attachment device is, along a longitudinal first beam axis, movably arranged on the first beam and the second attachment device is, along a longitudinal second beam axis, movably arranged on the second beam. In this embodiment, the attachment means or attachment is movably in a diagonal direction. The attachment means or attachment can be brought into a position, where they can be attached to the respective mounting flange from both sides. 
     The longitudinal axes of the first and the second beam can be perpendicular to each other. In this embodiment, the relative position between the first attachment means or first attachment and the second attachment means or second attachment can be adjusted in a way that they can be attached to a circular mounting flange of the tower at, concerning the diameter of the tower, opposite sides. In this case and assuming the V-shaped beam arrangement and the ground or a horizontal beam connected with the V-shaped beam arrangement enclose an angle of 45°, the lower side of the mounting flange of the tower being in the non-erected position is, independent from the diameter of the tower, at the same position regarding the respective tool device allowing an optimized usage of support sections, as will be described later in more detail. 
     The first beam can act as a guiding rail for the first attachment device and the second beam can act as a guiding rail for the second attachment device. For this purpose, guiding means  between the respective beam and the respective attachment device, like e.g. sliding shoes or or guide like, can be provided. 
     The first beam can comprise a, regarding its longitudinal axis, extendable first beam bar and the second beam can comprise a, regarding its longitudinal axis, extendable second beam bar, wherein the respective attachment device is attached to the respective beam bar. The respective attachment device is attached to an axial front end of the respective beam bar. By extending the beam bar, the length of the respective beam and, hence, the position of the respective attachment device, can be adjusted. 
     In an embodiment of the invention, the first hoisting fastener and the second hoisting fastener of the top tool device are located along a connecting line defined by the first attachment device and the second attachment device. Especially in the embodiment having the attachment devices positioned along a diameter line of the circular cross section of the tower, the respective positioning of the hoisting fasteners allow hanging the tower vertically, i.e. avoiding a vertical tilt, when hanging on a rope of the crane. 
     The top tool device can furthermore comprise a third hoisting fastener adapted to be connected with another rope of the crane. After removing the top tool device from the top mounting section of the tower (e.g., after the tower has been erected and mounted on the ground by its bottom mounting section) and hoisting the top tool device away by the crane, the top tool device could possibly rotate uncontrollably around an axis defined by the first hoisting fastener and the second hoisting fastener. To avoid this, the third hoisting fastener can be connected to another rope of the crane, leading the third hoisting fastener to act as a third fixing point of the top tool device avoiding these uncontrollable movements. 
     In an embodiment of the present invention, the bottom tool device and/or the top tool device, especially the or a V-shaped beam arrangement or a horizontal beam, comprises a support section, wherein the tower or the tower segment rests on the support section if the tower or the tower segment is in the non-erected position and attached to the respective tool, e.g. after the tower or tower segment has been unloaded from the truck. Then, the weight of the tower is not only held by the attachment means, especially by the clamping connection provided by the attachment means, but also by the support section. The support section can be a nose or a support plate. 
     Especially if the attachment means are arranged on the V-shaped beam arrangement, wherein the first beam and the second beam of the beam arrangement are perpendicular to each other, the support section can be located on or near the lower point of the V-shaped beam arrangement. Since, as described above, in this embodiment the lower point of the circular cross  section of the tower is always at the same position, the support section supports the tower independently from the diameter of the tower. The support section can also be part of or attached to a plate of the respective tool device. 
     Especially a horizontal beam, which is connected to the lower point of the V-shaped beam arrangement, or the frame of the respective tool device can comprise two support sections. In this embodiment, the tool support sections are symmetrically spaced apart from the longitudinal middle axis (which is a symmetry axis) of the tool device. 
     The support section(s) can be support plates or noses or the like. If one central support section is provided to hold the tower at a central position, the contact area of the support section holding the tower is horizontal. There can also be provided two or more support sections additionally or alternatively to the central support section. These support sections are eccentrically positioned on the tool device, i.e. positioned apart to its middle axis, wherein the contact area of the support section is slanted. In this embodiment, the support sections can be used independently from the diameter of the tower. 
     The support section can be rotatably or pivotally attached to the respective tool device. In this embodiment, the contact area of the support sections automatically adjusts to the diameter of the tower when the tool device gets attached to the tower. 
     The bottom tool device or the top tool device can comprise an, especially box-like, power pack to provide the power supply for the respective tool device, especially for the pneumatic or hydraulic or electric means. The power pack can comprise or be equipped with an accumulator. The power pack can be mounted freely rotatably on the respective tool device and can be equipped with balance weights to ensure that the power pack is aligned horizontally at all times, especially during the erecting process of the tower. In this embodiment, a leakage or spill of battery liquid is avoided. To store tools, especially tools for mounting or dismounting the tool device to or from the hoisting means or hoist, the top tool device and/or the bottom tool device can comprise a tool box. Alternatively, tools can also be stored within the power pack. 
     The tool arrangement can comprise a transportation device attachable to the top tool device and the bottom tool device. For transportation, e.g., for sea transportation, several towers are often stacked one upon the other in the non-erected position. To connect the top/bottom tool devices attached to these towers and positioned on top of each other, the tool arrangement further comprises the, frame- or plate-like, transportation device. The transportation device is adapted to be connected to one tool at one side and to another tool at the opposite side, e.g., screws, clamping fasteners and/or other suitable attaching means.  
     The top tool device and/or the bottom tool device can comprise a mounting means or mount allowing the tool device to be brought to the respective mounting flange simply. The mounting means being attachable or attached to the respective tool device and comprises two fork pockets allowing the respective tool device to be transported and hoisted to the mounting flange (of the tower typically already loaded on the truck) by a telescopic handler or pallet transporter. 
     The top tool device and the bottom tool device can furthermore comprise storing pillars. The storing pillars can be extendable from the frame of the respective tool device. Alternatively, the storing pillars can also be attachable to the frame by suitable attachment means. When attached to the frame, the storing pillars can point into a direction perpendicular to the plate or the frame of the respective tool device, especially into a direction perpendicular to the extendable pillars acting as the lifting means or lift. Several tool devices can be stored or transported by stacking them, wherein each storing pillar rests on a respective storing pillar support of the tool device located next to the respective tool device. The storing pillar support can be a recessed section of the surface of the plate or the frame of the tool device. 
     Although the top tool device and the bottom tool device are mainly discussed apart from each other, basically the top tool device can be used as the bottom tool device and vice versa. Since the top mounting section and the bottom mounting section, which are in many cases mounting flanges, are based on the same principle the top tool device can be connected to the bottom mounting section as well and also the bottom tool device (or at least the first device section of the bottom tool device) can be connected to the top mounting section. Hence, the tool arrangement can comprise a top tool device, which is identically to the bottom tool device or the first device section of the bottom tool device. Providing components of the tool arrangement based on the same construction simplifies the handling of the tool arrangement as well as its manufacturing. 
     BRIEF DESCRIPTION 
     Some of the embodiments will be described in detail, with reference to the following figures, wherein like designations denote like members, wherein: 
       FIG. 1  shows a first device section of a bottom tool device of an embodiment of the tool arrangement according to the present invention, in a state where it is not attached to a tower; 
       FIG. 2  shows the first device section of  FIG. 1  attached to the tower;  
       FIG. 3  shows the first device section together with a second device section from the bottom tool device of  FIGS. 1 and 2 , not attached to each other and the tower being in a non-erected position; 
       FIG. 4  shows the first device section and the second device section from  FIG. 3 , attached to each other and the tower being in the non-erected position; 
       FIG. 5  shows the first device section and the second device section from  FIGS. 3 and 4 , the tower being in an erected position; 
       FIG. 6  shows a top tool device of the embodiment of the tool arrangement according to  FIGS. 1 to 5 , being not attached to the tower; 
       FIG. 7  shows a detailed view of the top tool device of  FIG. 6 ; 
       FIG. 8  shows a detailed view of the top tool device of  FIG. 6 , being attached to the tower; 
       FIG. 9  shows the top tool device from  FIGS. 6 to 8 , being attached to the tower and hanging on ropes of a crane, the tower being in the erected position; 
       FIG. 10  shows a detailed view of the top tool device of  FIG. 6 , being attached to the tower; 
       FIG. 11  shows the tool arrangement together with the tower in the non-erected position and loaded on a truck; 
       FIG. 12  shows the tool arrangement from  FIG. 11  unloaded from the truck, wherein the truck is leaving the tower; 
       FIG. 13  shows the tool arrangement from  FIG. 12  unloaded from the truck, wherein the truck has left the tower; 
       FIG. 14  shows the top tool device according to  FIGS. 6-10  with a mounting means or mount; 
       FIG. 15  shows several tool devices according to  FIGS. 6-10  stacked to each other; and 
       FIG. 16  shows several towers stacked up on each other and attached to several tool devices according to  FIGS. 6-10 .  
    
    
     DETAILED DESCRIPTION 
     A tool arrangement  1  according to embodiments of the present invention comprises a bottom tool device  2  and a top tool device  3 . The tool arrangement  1  is provided to simply pivot the tower  4  from a non-erected position ( FIGS. 1-4 ) to an erected position ( FIG. 5 ) and to unload the tower  4  from a transport vehicle and store the tower  4  on a construction site with only little effort ( FIGS. 11 and 12 ). 
     The tower  4  is exemplarily a hollow, tubular and pre-casted tower segment of a tower structure of a wind turbine. The tower  4  has a circular cross section and comprises a bottom mounting section  5  on its lower axial end and a top mounting section  6  on its upper axial end. Exemplarily, the mounting sections  5 ,  6  are mounting flanges pointing radially inwards and comprising several holes. The complete tower structure of the wind turbine consists of several towers  4  standing one above the other, wherein the towers  4  are attached to each other by the mounting sections  5 ,  6  by screws and nuts or other suitable attachment means. 
     As shown in  FIGS. 1 and 2 , the bottom tool device  2  comprises an attachment means  7  consisting of two attachment devices  8 . The attachment devices  8  are mounted on a first device section  9  of the bottom tool device  2 . The first device section  9  is removably attachable to the bottom mounting section  5  of the tower  4  by the attachment means  7 . In  FIG. 1 , the first device section  9  is not attached to the bottom mounting section  5  and in  FIG. 2  the first device section  9  is attached to the bottom mounting section  5 . As will be described later in more detail, for this purpose the attachment means  7  are moved along a horizontal axis to attach the first device section  9  to the tower  4 . 
     Referring to  FIGS. 3 and 4 , the second device section  10  of the bottom tool device  2  will be explained in more detail. As it will be described later, in  FIG. 3  the first device section  9  is standing on the ground carrying the weight of the tower  4 . The second device section  10  is also arranged on the ground beneath the first device section  9 . 
     The first device section  9  and the second device section  10  are attachable to each other by axis forming means  11  or axis former.  FIG. 3  shows the device sections  9 ,  10  not attached to each other and  FIG. 4  shows the device sections  9 ,  10  attached to each other. The axis forming means or axis former  11  engage with each other when the device sections  9 ,  10  are attached to each other and build a pivot axis  12  of the bottom tool device  2 . Hence, the tower  4 , when fixed to the bottom tool device  2 , can be pivoted around the pivot axis  12 , wherein the pivot axis  12  is perpendicular to a longitudinal axis  48  of the tower  4  and parallel to the second device section  10  to the ground where the tower  4  will be erected.  
     Rotating the tower  4  around the pivot axis  12  allows for pivoting the tower  4  from the non-erected position ( FIG. 4 ) to the erected position ( FIG. 5 ). For this, the tower  4  only needs to be lifted or hoisted by a crane, e.g., by a rope attached to the top mounting section  6  of the tower  4 . Another crane securing the tower  4  on the bottom mounting section  5  while erecting the tower is not required, since the bottom tool device  2  provides a safe and secure support of the lower tower end while getting erected. 
     Next, the attachment means  7  of the bottom tool device  2  will be described in more detail. The first device section  9  comprises a horizontal main beam  13 , wherein the attachment devices  8  are movably mounted on the main beam  13  along a longitudinal axis of the main beam  13 .  FIGS. 1 and 2  illustrate the mechanism attaching the attachment devices  8  to the bottom mounting section  5 . After positioning the first device section  9  to the bottom mounting section  5 , the attachment devices  8  are moved away from each other along the longitudinal axis of the main beam  13  leading the attachment devices  8  to engage behind the bottom mounting section  5 . Hence, as shown in  FIG. 2 , the bottom mounting section  5  is clamped between each of the attachment devices  8  and the main beam  13  of the first device section  9 . Since, as will be described later in more detail, the tower  4  furthermore rests on support sections  34 , a safe and secure fixation, especially during the erecting process, of the tower  4  is ensured. 
     Next, the axis forming means  11 , consisting of two pins  14  and two pin supports  15 , will be described in more detail. The first device section  9  comprises the pins  14  and the second device section  10  comprises the pin supports  15 . The pins  14  are adapted to be inserted into the U-shaped pin supports  15 , wherein the longitudinal axis of the pins  14  are aligned to each other forming the pivot axis  12 . Inserting the pins  14  into the pin supports  15  is illustrated by  FIGS. 3 and 4 . The tower  4 , together with the first device section  9 , is lowered to insert the pins  14  into the pin supports  15 . Details concerning this lowering will be described later in more detail. 
     Next, the second device section  10  will be described in more detail. The second device section  10  comprises a ground plate  16  with several ground spikes  17  protruding from the plate  16 . The spikes  17  are provided to protect the second device section  10  from slipping on the ground while the tower  4  is erected. When the tower  4  is lowered (like shown in  FIGS. 3 and 4 ) the weight of the tower  4  leads the ground plate  16  getting pressed towards the ground, leading the spikes  17  getting sticked into the ground. To ensure a stable and secure footing, the ground can be gravelled. 
     The top tool device  3  is a frame-like structure comprising a V-shaped beam arrangement  18  with a first beam  19  and a second beam  20 , wherein the longitudinal axes of the beams  19 ,  20  are perpendicular to each other ( FIG. 6 ). The first beam  19  comprises an extendable first beam bar  21  and the second beam  20  comprises an extendable second beam bar  22 . Each attachment  means  23  is an attachment device  24  located at the axial front end one of the beam bars  21 ,  22 . The attachment devices  24  are clamping devices comprising a first clamping part  25  and a second clamping part  26 . 
     Details of attaching the top tool device  3  to the top mounting section  6  are illustrated in  FIGS. 7 and 8 , where an enlarged view of the attachment device  24  of the second beam bar  22  is shown. In  FIG. 7 , the top tool device  3  is not attached to the top mounting section  6 . In  FIG. 8  the beam bars  21 ,  22  are extended to position the top mounting section  6  between the clamping parts  25 ,  26 . Next, the top mounting section  6  can be attached to the top tool device  3  by clamping the clamping parts  25 ,  26 . Extending the beam bars  21 ,  22  and clamping the attachment devices  24  occurs via hydraulic or pneumatic means (not shown). 
     Further aspects of the top tool device  3  are illustrated in  FIG. 9 . Due to the right angle between the first beam  19  and the second beam  20 , the attachment devices  24  can be clamped to the top mounting section  6  diametrically opposed to each other. Along this diameter, the top tool device  3  comprises a first hoisting fastener  27  and a second hoisting fastener  28  to connect the top tool device  3  to hoisting means or hoist  29 , i.e. to ropes of a crane. The hoisting fasteners  27 ,  28  can be loops or hooks. 
     After being erected, the tower  4  is hoisted to the position where it has to be mounted by the crane. If the tower  4  is the undermost tower section of the complete tower, the tower  4  has to be hoisted or brought to the foundation where it has to be mounted. Otherwise, the tower  4  has to be hoisted to the (already erected and mounted) tower section, on whose top mounting section the bottom mounting section  5  of the tower  4  will be mounted. However, after the tower  4  has been erected and before it gets hoisted to its designated position, the bottom tool device  2  has to be detached from the bottom mounting section  5  of the tower  4 . For this purpose, immediately after the tower  4  has been erected and still hangs on the hoisting means  29  of the crane, staff can detach the attachment means  7 . After this, the crane can hoist the tower  4  away, wherein the bottom tool device  2  remains at its position on the ground. 
     Since the hoisting fasteners  27 ,  28  are positioned along the circular diameter of the tower  4 , a tilt of the tower  4  is avoided while it is hoisted away. 
     After the tower  4  has been hoisted to its designated position and mounted, the top tool device  3  can be detached from the top mounting section  6 , e.g., by climbing staff. Next, the top tool device  3  can be hoisted or brought away from the tower  4  by the crane. To avoid the top tool device  3  swinging around the axis provided by the hoisting fasteners  27 ,  28 , respectively, a third hoisting fastener  30  of the top tool device  3  is provided to be connected with another hoisting means  31 , e.g., another rope, of the crane.  
     Another aspect concerning the top tool device  3  is shown in  FIG. 10 , where, compared to  FIG. 4 , the top tool device  3  is shown in part from its back side. The top tool device  3  comprises two support sections  32  attached to a horizontal beam  33  on which the V-shaped beam arrangement  18  is attached. The tower  4  rests on the support sections  32  when the tower is in the non-erected position and attached to the top tool device  3 . The support sections  32  of the top tool device  3  are arranged symmetrically to the symmetry axis of the also symmetric V-shaped beam arrangement  18 . Hence, the weight of the tower  4  is not only held by the attachment devices  24  but also by the support sections  32 . Additionally, or alternatively, a support section can also be provided on the V-shaped beam arrangement  18 , especially on its lower edge. 
     In analogy to this, the bottom tool device  2  also comprises two support sections  34 , which are attached to a bar  49  protruding vertically downwards from the main beam  13  (see e.g.,  FIG. 1 ). The support sections  34  are positioned symmetrically to a vertical symmetry axis of the bottom tool device  2 . 
     The support sections  32 ,  34  are rotatably attached to the respective tool device  2 ,  3 . Hence, the contact area of the support sections  32 ,  34  automatically adjusts to the diameter of the tower  4  when the tool device  2 ,  3  gets attached to the respective mounting section  5 ,  6 . 
     Next, aspects concerning the transportation of the tower  4  to the construction side and the unloading process of the tower  4  from a transport vehicle, especially from a truck  45 , will be described in detail. Typically, before getting transported to the construction site, the tower  4  is loaded on the truck  45 . The tower  4  is fastened to the truck  45  by attaching it on a trailer of the truck  45  by, e.g., tension belts. Even before transporting the tower  4  to the construction side, the first device section  9  of the bottom tool device  2  is attached to the bottom mounting section  5  and the top tool device  3  is attached to the top mounting section  6 .  FIG. 11  shows the situation, where the tool devices  2 ,  3  are attached to the tower  4 , wherein the tower  4  is loaded on the truck  45 . 
     To simplify the unloading process of the tower  4  from the truck  45 , the first device section  9  of the bottom tool device  2  comprises a lifting means  35  and the top tool device  3  comprises a lifting means  36 . The lifting means  35  comprises two extendable pillars  37  which can be extended from vertical beams  38  of the first device section  9  of the bottom tool device  2 . In analogy to this, the lifting means  36  also comprises two extendable pillars  39 , which are extendable from vertical beams  40  of the top tool device  3 . The pillars  37 ,  39  are not extended while the tower  4  is transported to the construction side by the truck  45  (see  FIG. 11 ). In this situation, the weight of the tower  4  weighs on the truck  45 .  
     After arriving at the construction site, after placing the truck  45  to the position where the tower  4  shall be unloaded and after removing or loosening the tension belts, the pillars  37 ,  39  of the tool devices  2 ,  3  are extended towards the ground by hydraulic and pneumatic means. During the extending process, the pillars  37 ,  39  or, more precisely, foot plates  50 , which are attached to the lower front edge of each of the pillars  37 ,  39 , get in contact with the ground (which should be firm and stable). Each of the foot plates  50  is pivotally attached to the respective pillar  37 ,  39  via a hinge joint  51  (see  FIGS. 6 and 10 ), so that the orientation of the foot plates  50  are automatically adjusted to a possible unevenness of the ground. All pillars  37 ,  39  or foot plates  50 , respectively, get in touch with the ground at the same time. After this, the pillars  37 ,  39  are extended further (exemplarily some centimetres or decimetres) so that the weight of the tower  4  does not weigh on the truck  45  anymore, but on the pillars  37 ,  39 . Additionally the tower  4  will be lifted or raised during this process, ideally by the same distance as the pillars  37 ,  39  are further extended after getting into contact with the ground. 
     Although in this situation the truck  45  is still located beneath the tower  4 , the truck  45  is not connected to the tower  4  anymore. Since the distance between the pillars  37  of the bottom tool device  2  (which is exemplarily located at the side of the tower  4  facing the truck  45 ), and also the distance between the pillars  39  of the bottom tool device  3  is larger than the width of the truck  45  respectively its trailer, the truck  45  respectively the trailer can just drive straight ahead to leave the position where the tower  4  has been unloaded.  FIG. 12  shows the tower  4  with the tool devices  2 ,  3  being attached to the mounting sections  5 ,  6  and the pillars  37 ,  39  being extended after the truck  45  is leaving the tower  4 .  FIG. 13  shows the tower  4  after the truck  45  has left the construction site. 
     Hence, the tool arrangement  1  allows for unloading the tower  4  from the truck  45  without the need of a crane. So far, for unloading the tower  4  even two cranes have been required, wherein each side of the tower  4  has been hoisted by one of the two cranes, the truck  45  has been driven away and the cranes have lowered the tower  4  to store it on supporting feet. 
     Supporting feet are often used as supporting means for towers in the non-erected or lying position. Such supporting feet typically comprise a plain contact area adapted to rest on the ground and an arched or two chock-like contact areas adapted to support the tower  4  on its outer wall. Instead of support feet, the tool arrangement  1  can be used to store the tower  4  temporarily on the construction site, being supported by the tool devices  2 ,  3  (see.  FIG. 13 ). For this, no further action is needed to store the tower  4  after being unloaded from the truck  45  as described above. Since the tool devices  2 ,  3  are attached to the tower  4  on its attachment means  5 ,  6 , a contact of the outer wall to the ground or tower feet, leading to an unwanted deformation or scratches of the tower  4 , during the storage of the tower  4  is avoided.  
     As a next step (again referring to  FIG. 13 ) the tower  4  can be erected. First, the second device section  10  of the bottom tool device  2  is located beneath the first device section  9 , as shown in  FIG. 3 . Retracting the pillars  37 ,  39  makes the axis forming means  11  to engage with each other forming the pivot axis  12  (as shown in  FIG. 4 ). 
     To supply the top tool device  3  (and possibly also the bottom tool device  2 ), especially the hydraulic means, with electricity, the top tool device  3  comprises a power pack  41 . The power pack  41  comprises an accumulator (not shown) and is freely rotatable about a horizontal axis to be always aligned horizontally, especially during erecting the tower  4 . For this purpose, the power pack  41  is equipped with weights at its lower side avoiding battery liquid getting spilled. 
     As shown in  FIG. 14 , the tool arrangement  1  further comprises transportation means  42  with two fork pockets  43 . The transportation means  42  can be removably attached to the tool devices  2 ,  3 , wherein a telescopic handler  44  can be used to lift the respective tool device  3 ,  4  to attach it to the tower, which is already loaded on the truck  45 . 
       FIG. 15  shows three top tool devices  3  which are stacked. Each of the top tool devices  3  comprises four storing pillars  46  which are detachably attached to the vertical beams  38 . The axes of the storing pillars  46  and the vertical beams  38  are rectangular to each other. The storing pillars  45  enable the top tool devices  3  to be stacked for, e.g., transportation or storing or the like. When the top tool devices  3  are stacked, each storing pillar  46  rests on a respective storing pillar support, which can be a recessed section of the adjacent top tool device  3 . 
     Especially for sea transportation, several towers  4  are often stacked one upon the other in the non-erected position as shown in  FIG. 16 . To enable a secure stacking, the tool arrangement  1  further comprises a frame-like connecting piece  47  which is removably attachable to the bottom tool device  2  and to the top tool device  3  on opposite sides of the connecting piece  47 . The tool devices  2 ,  3  can be attached to the connecting piece  47  by attaching means like screws, clamping devices or the like (not shown). 
     Although the present invention has been disclosed in the form of preferred embodiments and variations thereon, it will be understood that numerous additional modifications and variations could be made thereto without departing from the scope of the invention. 
     For the sake of clarity, it is to be understood that the use of “a” or “an” throughout this application does not exclude a plurality, and “comprising” does not exclude other steps or elements.