Device and method for compensating for tolerances of pretensioned connecting assemblies

Abstract

The invention relates to a method and an assembly for pretensioning a connecting assembly, in particular for connecting rotor blade segments, which have a longitudinal axis (10), of a wind turbine or a hydroelectric power plant, said connecting assembly being arranged between at least two components to be connected. The assembly comprises at least one pretensioning element (104, 204), wherein at least two wedges (2, 3, 103, 203) are pushed against each other in order to pretension the components to be connected. At least one first pin (102) and at least one second pin (202) lying opposite thereto are connected to a first and second component (101 and 201, respectively) to be connected. According to the invention, the pins (102, 202) lying opposite each other form a pin pair, wherein the first and second pin (102, 202) have a nut side facing in the direction of a nut (1) and in the direction of the component (101, 201) to be connected lying opposite thereto, and the nut (1) is connected to the first and second pin (102, 202) via connections (902, 903).

Description

[0001] DEVICE AND METHOD FOR TOLERANCE COMPENSATION OF PRE-TENSIONED CONNECTION ARRANGEMENTS

[0002] The present invention relates to an assembly and a method for preloading connecting elements. It relates to connecting elements in which two preloaded bolts are connected with a nut. Among other things, this relates to connecting elements on split rotor blades of wind turbines. In particular, the connection system can be used to connect rotor blade segments of a wind or hydroelectric power plant.

[0003] The invention can be applied in all fields of technology in which components are connected and prestressed.

[0004] STATE OF THE ART

[0005] Arrangements for prestressing connecting elements are described in detail in the patents EP3441561A1 , W02015181401 A1 , DE 202017 105765 U1 or DE2611237A1.

[0006] When connecting split rotor blades of a wind or hydropower plant, a preload is ideally applied to the connecting element to increase its fatigue strength and create a frictional connection, as well as to prevent it from loosening during operation. If the connecting element is designed as a threaded bolt that is to be screwed into the opposing components on both sides, the respective threads do not usually overlap with their imaginary continuation. Varying the distance between the components can, although it can overlap the thread helices, changes the distance between the components, which is usually undesirable. Furthermore, this approach does not work with several adjacent connections, as each connection would require individual spacing adjustment.

[0007] A possible solution to this problem is shown in W02010086297A2 Fig. 9 and 10. The disadvantage here is the very high manufacturing accuracy when several bolts are inserted next to each other. In order for the screw connection to be possible at all, the opposing threads must be geometrically aligned to one another so that a thread helix is ​​created which continues into the other component and into which the bolts can be screwed. Even with fiber composite components with threaded bushings, this is only possible with increased manufacturing effort due to the common manufacturing tolerances. One solution for this is described, among others, in EP3150848B1. There, the connecting surfaces are aligned to one another and machined by facing and only then are all the threads cut (paragraph 0011, claim 1). The disadvantages here are the high technical effort and the required precision of the thread position.

[0008] Another possible solution to this problem is shown in W02010086297A2 Fig. 8. A recess allows the coaxial insertion of a screw into a through hole for engagement with a threaded bore in the opposing component. Subsequent preloading of the connection is possible using conventional methods. The disadvantage here is the notch effect of the recess 149 in component 102. The recess leads to excessive stress and reduces the component's strength. Adjusting the geometry leads to undesirable force deflection and, under certain circumstances, changes in the outer shape, both of which have a negative impact on the structural integrity and aerodynamics of wind turbine rotor blades.

[0009] Another option for connecting and preloading the connecting elements is described in US2014271210A1. An adapter is inserted between the two rotor blade sections. This adapter contains laterally accessible recesses through which the components to be connected are individually screwed to the adapter. The disadvantages of this approach are the additional weight of the adapter and the stress-concentration effects of the recesses in the adapter. Furthermore, the adapter itself is not preloaded throughout. This reduces its fatigue strength.

[0010] DISCLOSURE OF THE INVENTION

[0011] The invention relates to an arrangement for prestressing a connecting arrangement, in particular for connecting rotor blade segments of a wind or hydroelectric power plant, with a longitudinal axis arranged between at least two components to be connected. The arrangement comprises at least one prestressing element that can apply a prestressing force substantially orthogonal to the longitudinal axis of the connecting arrangement, such that at least two wedges can be displaced against one another on at least one sliding plane, whereby the connecting arrangement can be prestressed substantially parallel to the longitudinal axis, and in which at least one first bolt is screwed into the first component to be connected and, opposite, at least one second bolt is connected, preferably also screwed, to a second component to be connected.

[0012] It is proposed that the opposing bolts form a bolt pair. For this purpose, the bolts are aligned substantially parallel to the longitudinal axis of the connecting arrangement, with at least the first bolt having a component-side side pointing in the direction of the first component to be connected. At least the first and second bolts have a nut-side side pointing in the direction of a nut and in the direction of the opposite component to be connected. At least the first and second bolts have a connection on the nut-side, and the first and second bolts have a component-side connection to the component to be connected. The nut is connected to the first and second bolts via the connections, with at least two connections having a positive connection, at least one of these positive connections being a connection of the nut, and at least one of the at least two positive connections being a thread.

[0013] Connection systems between two modules of a rotor blade typically include numerous preloaded bolts with threads. This places high demands on the flatness tolerance of the flange surfaces as well as on the alignment of the threads in the two rotor blade modules.

[0014] The invention thus relates to an arrangement and a method for connecting components and preloading the connecting elements used. The components to be connected have no recesses or flange bodies accessible from the rear. Furthermore, neither the precise rotational alignment of the threads nor the exact distance between the end faces of the components are necessary during the production of the two components to be connected. The method and the arrangement according to the invention enable tolerance compensation. This allows for lower tolerance requirements for all components involved. This reduces manufacturing costs.

[0015] In addition, the invention simplifies the assembly of all components. This is achieved through a design that allows for tool-free pre-assembly.

[0016] The following advantages arise from the invention:

[0017] The connection is extremely strong. This is achieved because no recesses are required for applying the preload force. All components involved are preloaded.

[0018] The tolerance requirements for thread manufacturing are low, as a defined alignment of the threads to each other is not necessary. This is achieved by an arrangement of positive connections.

[0019] The requirements for the flatness of the end faces of the components and the coplanarity of the end faces of adjacent components when using multiple connecting elements are low. This is achieved by adjustable shims. Tool-free pre-assembly of the entire connection is possible. This reduces assembly times, which in the case of large components such as rotor blades also means a reduction in the crane's operating time. This is achieved by an arrangement of retaining clamps and springs.

[0020] The proposed connection arrangement enables torsion-free preloading of the connecting bolts. This achieves precise and reproducible preloading of the components. At the same time, the technical complexity and the requirements for the preloading process are minimal. These properties are achieved by using expanding wedges that are moved relative to each other via a transversely arranged preloading element.

[0021] The elimination of rear-accessible flange bodies enables force transmission directly into the component without introducing the bending typical of flanges into the component.

[0022] In an advantageous embodiment, the component-side connection of the first bolt can be a threaded connection and the nut-side connection of the first bolt can be a threaded connection whose thread is opposite to the component-side thread of the first bolt and the nut-side connection of the second bolt can be a threaded connection whose thread is opposite to the component-side thread of the first bolt.

[0023] In an advantageous embodiment, at least one component for length compensation can be located between the components to be connected.

[0024] In an advantageous embodiment, the component for length compensation can consist of at least one outer component with an internal thread and at least one inner component with an external thread, which change the total length of the component for length compensation by rotating against each other.

[0025] In an advantageous embodiment, the wedges can be pushed apart by at least one element with spring properties and pressed with an outer end face against at least one stop.

[0026] In an advantageous embodiment, at least one of the stops can have an undercut, so that at least two components of the connecting arrangement can no longer be displaced independently of one another in the direction of the longitudinal axis of the connecting arrangement. In a subordinate aspect, a method for connecting and prestressing a connecting arrangement using a previously described arrangement is proposed, comprising the following steps:

[0027] - Providing the components of the connection arrangement to be connected;

[0028] - Connecting at least two bolts to the components to be connected;

[0029] - Connecting the at least one nut to the at least two bolts;

[0030] - Moving the at least two wedges towards each other using at least one prestressing element so that the connecting arrangement is significantly prestressed in the direction of the longitudinal axis.

[0031] In a subordinate aspect, a further method for prestressing a connecting arrangement, preferably using a previously described arrangement, is proposed, comprising the following steps:

[0032] - Providing a first component to be connected with at least one thread;

[0033] - Providing a second component to be connected with an advantageous arrangement for connecting a second bolt;

[0034] - Providing a first bolt with a component-side thread and a nut-side thread opposite thereto;

[0035] - Providing a second bolt with a nut-side thread and an arrangement for connecting to the second component to be connected;

[0036] - Providing at least one mother;

[0037] - Connecting at least two bolts to the components to be connected;

[0038] - screwing at least one nut onto at least one bolt;

[0039] - Aligning the components to be joined to each other;

[0040] - aligning the threads of the opposing bolts by screwing or unscrewing at least one of the opposing bolts;

[0041] - Connect the opposite bolts with the nut;

[0042] - Pre-tensioning of the connection arrangement significantly in the direction of the longitudinal axis.

[0043] In an advantageous embodiment of the above-mentioned method, the prestressing of the connecting arrangement may comprise the following further steps:

[0044] - Providing at least two wedges;

[0045] - Positioning the wedges between the components to be joined;

[0046] - Moving the wedges (to each other) using at least one prestressing element so that the connecting arrangement is prestressed significantly in the direction of the longitudinal axis. In an advantageous embodiment of all the aforementioned methods, the following further work steps can be included:

[0047] - Providing a component for length compensation;

[0048] - Positioning the component to compensate for the length between the components to be connected;

[0049] - Compensating tolerances by changing the length of the component to compensate for the length.

[0050] In an advantageous embodiment of all the aforementioned methods, the wedges can be pushed apart by at least one element with spring properties and pressed with an outer end face against at least one stop, with the following further steps:

[0051] - Compressing the wedges against a restoring force;

[0052] - Placing the compressed wedges between the components to be joined;

[0053] - Positioning the components of the connecting arrangement in such a way that the wedges can be pressed apart by the spreading force of the elements with spring properties and that the wedges are pressed with at least one of their end faces against at least one stop.

[0054] A key aspect of the invention is the compensation of manufacturing-related thread alignment tolerances through the use of multiple bolts connected by a nut, in which the threads are advantageously arranged. A length compensation element can correct the spacing tolerance of the components to be connected. In a connection system with several adjacent connection elements, this can advantageously compensate for the flatness tolerance. Furthermore, a mechanism with advantageously shaped expansion wedges enables simple assembly and preloading of the connection arrangement.

[0055] BRIEF DESCRIPTION OF THE INVENTION

[0056] Fig. 1: Represents an embodiment of the connection arrangement with all components

[0057] Fig. 2: Represents an embodiment of the connection arrangement with an element for length compensation

[0058] Fig. 3: Represents an embodiment of the connection arrangement with an arrangement for easy assembly Fig. 4: Represents an embodiment of the arrangement for easy assembly with undercuts

[0059] Fig. 5: Represents an embodiment of the connecting arrangement with two wedges

[0060] Fig. 6: Represents an embodiment of the connection arrangement with four wedges

[0061] Fig. 7: Represents an embodiment of a wind turbine

[0062] Fig. 8: Represents a rotor blade

[0063] Fig. 9: Represents a separation point between two rotor blade modules that are connected to each other with a connection system.

[0064] Fig. 10: Represents the connection of a rotor blade with another component, which are connected to each other with a connection system.

[0065] Fig. 11 : Represents an embodiment of the connection arrangement with positive locking.

[0066] Fig. 12: Shows the orientation of the thread helices to each other.

[0067] Fig. 13: Shows an embodiment of the connection arrangement in which the nut is part of the first bolt.

[0068] DETAILED DESCRIPTION OF THE INVENTION

[0069] Fig. 1: A prestressed connection arrangement 100 connects two components 101, 201. The connection arrangement has a longitudinal axis 10. At least two bolts 102, 202 and a nut 1 are arranged substantially parallel to this longitudinal axis. The prestress is applied via at least one prestressing element 104, 204. The prestressing element generates a first force along its longitudinal axis 9, substantially orthogonal to the longitudinal axis 10 of the connection arrangement. This force causes the wedges 2, 3, 103, 203 to be displaced relative to one another in such a way that they generate a second, advantageously higher, force substantially in the direction of the longitudinal axis of the connection arrangement. This second force corresponds to the prestressing of the connection arrangement. The prestressing causes components such as the bolts and the nut to be lengthened. These are the tensile bodies of the connection arrangement. Other components such as the wedges are compressed by the prestressing. These are the compression bodies of the connection arrangement.A wedge is a component with at least two side surfaces that meet at an angle. This arrangement allows a force directed toward the wedge tip to be redirected into a normal force acting essentially orthogonally to it.

[0070] Furthermore, the connecting arrangement consists of a pair of bolts. The pair of bolts consists of two opposing bolts 102, 202. The two bolts are aligned essentially parallel to the longitudinal axis of the connecting arrangement. The bolts each have a component-side side that points in the direction of the first component to be connected and a nut-side side that points in the direction of the nut and / or in the direction of the second component to be connected. At least one first bolt has a thread 14 on the component-side side and an opposing thread 15 on the nut-side side. The second bolt has at least one thread on the nut-side side 16. The second bolt is advantageously connected to the second component to be connected. This can be done including, but not exclusively, via a thread 12, 17, a positive connection or a material connection.By rotating the first bolt 102, the nut-side threads of bolts 15, 16 can be aligned. Only when the continuations of both nut-side threads are aligned can the nut be screwed onto both bolts or transferred from the first bolt to the second bolt.

[0071] The outer shape of the nut 1 can be arbitrary. In an advantageous embodiment, it is designed so that a positive force introduction for rotating the nut is possible. The outer geometry of the nut can be, including but not exclusively, hexagonal or round. It can also promote a frictional connection through a favorable surface finish. The inner geometry can have, including but not exclusively, one or more positive connections. These positive connections can be, among other things, threads. The nut can be designed as a threaded bushing, threaded tube, or nut-like connecting piece. The nut can be formed in one or more parts. The nut can also be a component of one of the bolts.

[0072] In an advantageous embodiment of the connecting arrangement, the nut is screwed onto one of the two bolts before the components are aligned with each other. The components to be connected are then aligned with each other so that opposing bolts each form a bolt pair. By rotating at least one bolt, the nut-side thread helices of the bolt pairs overlap. The nut is then screwed from one bolt to the other, creating a connection between the two bolts. Two threads are referred to as opposing threads if one of the threads is clockwise and the other counterclockwise.

[0073] In an advantageous embodiment of the connecting arrangement, this and / or its pressure body encloses a pair of bolts.

[0074] In an advantageous embodiment of the connecting arrangement, this and / or its pressure body encloses at least two adjacent pairs of bolts.

[0075] In an advantageous embodiment of the connecting arrangement, these and / or their pressure bodies are located between two adjacent pairs of bolts.

[0076] In an advantageous embodiment of the connection arrangement, the prestressing elements 104, 204 are screws. These are connected to a wedge 3 via a thread. The screws are located in a through hole in another wedge 2. By turning the screws, the distance between the wedges 2, 3 is reduced. This, together with the wedge-shaped geometry of the components, leads to a force in the direction of the longitudinal axis of the connection arrangement. This force prestresses the connection.

[0077] In an advantageous embodiment of the connecting arrangement, the prestressing elements 104, 204 are screws with opposing thread formations. These are connected to at least one of the wedges 3 via a portion of the thread. The screw with the opposing thread is engaged in at least one other wedge 2. By turning the screws, the distance between the wedges 2, 3 is reduced.

[0078] In an advantageous embodiment of the connecting arrangement, at least one prestressing element is located between two adjacent pairs of bolts.

[0079] In an advantageous embodiment of the connecting arrangement, at least one prestressing element is located in a free space between two opposing bolts. The axes of the prestressing elements 9 are arranged substantially orthogonally to the axis of the connecting arrangement 10. The axis of the prestressing element is as close as possible to the axis of at least one bolt. This arrangement is made possible by an advantageous recess in the nut 1.

[0080] In an advantageous embodiment, the bolts have a right-hand thread on the side of the components to be connected and a left-hand thread on the nut side. Thus, the threads in the components are right-hand threads, while the thread in the nut is left-hand threads. Before the threads are aligned, the nut is completely seated on one of the bolts. By turning the bolt not in contact with the nut, the threads of the nut-side threads can be aligned. The nut can then be screwed onto the other bolt by turning it until the engagement depth of both bolts is sufficient for the force to be transmitted.

[0081] In an advantageous embodiment, the alignment of the threads can be checked before connecting the bolts with the nut. This can be done, for example, using a thread gauge or by measuring the threads relative to each other.

[0082] In an advantageous embodiment, a bolt 102 with a component-side thread 14 is screwed into a component 101 with a thread 11. Opposite, a second bolt 202 with a component-side thread 17 is screwed into a second component 201 with a thread 12. A nut 1 with a thread 13 is screwed onto the nut-side thread 15 of the first bolt 102 and onto the nut-side thread 16 of the second bolt 202. The nut 1 thus connects the two threaded bolts 102, 202 to each other.

[0083] In an advantageous embodiment, one of the opposing bolts can also be a part or component of the component.

[0084] An advantageous embodiment of the connecting arrangement is an arrangement for prestressing a connecting arrangement 100 with a longitudinal axis 10 which is arranged between at least two components 101, 102 to be connected, containing at least one prestressing element 104, 204 which can apply a prestressing force substantially orthogonal to the longitudinal axis of the connecting arrangement, so that at least two wedges 2, 3, 103, 203 are displaced against each other on at least one sliding plane 21, 22, whereby the connecting arrangement is prestressed substantially parallel to the longitudinal axis and in which at least one first bolt 102 is screwed into the first component 101 to be connected and oppositely at least one second bolt 202 is connected to a second component 102 to be connected, characterized in that the opposite bolts 102, 202 form a bolt pair, the bolts are aligned substantially parallel to the longitudinal axis of the connecting arrangement,at least the first bolt has a component-side side that points in the direction of the first component to be connected, at least the first and second bolts have a nut-side side that points in the direction of a nut 1 and / or in the direction of the opposite component to be connected, at least the first bolt has a thread 14 on the component-side side and a thread 15 that runs counter to this on the nut-side side, and the second bolt has a nut-side thread 16 that runs counter to the component-side thread 14 of the first bolt, the second bolt is advantageously connected to the second component to be connected, and the nut is sufficiently screwed onto the nut-side thread of the first and second bolts.

[0085] Fig. 2: In an advantageous embodiment, the connecting arrangement includes a length-compensating component 301, 302. The length-compensating component is located primarily between the two components to be connected. Intentional and unintentional length tolerances of the entire connecting arrangement and / or the entire connecting system can be compensated for with the length-compensating component. Before prestressing the connecting arrangement with the aid of the prestressing elements, air gaps between the components of the connecting arrangement are adjusted, reduced, or closed with the length-compensating component.

[0086] In an advantageous embodiment, the length compensation component consists of two parts. The inner part 302 has an external thread. The outer part 301 has an internal thread. By rotating the outer part relative to the inner part, the length of the entire length compensation component changes. This change in length increases or decreases any gaps between the components of the connecting arrangement.

[0087] In an advantageous embodiment, the length compensation component consists of at least two parts. The parts can be moved relative to each other via wedge-shaped surfaces so that the overall length of the length compensation component changes.

[0088] Fig. 3: In an advantageous embodiment, the connection arrangement includes an arrangement for easy assembly. The arrangement for easy assembly consists of a combination of stops 402 and spring-action elements 401. The stops limit the distance between the first and second wedges. At least one spring-action element 401 presses at least one wedge 2, 3 with an end face 41 against a stop 402. At least one spring-action element acts primarily orthogonally to the longitudinal axis of the connection.

[0089] Fig. 4: In an advantageous embodiment of the arrangement for easy assembly, at least one stop 402 has an undercut 42. This undercut prevents or impedes separation of at least two of the components 2, 3, 103, 203 of the connecting arrangement significantly in the direction of the longitudinal axis of the connecting arrangement.

[0090] Fig. 5: An advantageous embodiment of the connecting arrangement 100 is shown in Fig. 5. Between two components 101, 201 to be connected, there are two wedges 2, 3. By means of at least one prestressing element 104, the wedges can be displaced against one another in such a way that the connecting arrangement is prestressed.

[0091] Fig. 6: An advantageous embodiment of the connecting arrangement 100 is shown in Fig. 6. Four wedges 2, 3, 103, 203 are located between two components 101, 201 to be connected. The distance between the first wedge 2 and the second wedge 3 can be reduced by at least one prestressing element 104, 204. The displacement of the wedges relative to one another leads to an extension of the connecting arrangement in the direction of the longitudinal axis 10 due to the sliding planes 21, 22 arranged at an angle. This extension prestresses the connecting arrangement.

[0092] Fig. 7, 8, 9, 10: In an advantageous embodiment, a wind turbine consists of a tower 504, a nacelle 503, a rotor hub 502, and at least one rotor blade 501. The rotor blade of the wind turbine can consist of several modules 601, 602. These modules are connected to one another at a point AA. At point BB, the rotor blade is connected to the rotor hub of the wind turbine. Connection systems 701, 801 are located at points AA and BB. These connection systems each consist of several connection assemblies 100.

[0093] In an advantageous embodiment of the connecting arrangement, at least one component to be connected can be a rotor blade of a wind turbine.

[0094] In an advantageous embodiment of the connecting arrangement, the components to be connected can be two or more modules of a rotor blade of a wind turbine.

[0095] In an advantageous embodiment of the connecting arrangement, it can be part of a connecting system 701, 801. The connecting system consists of several connecting assemblies 100, in particular arranged side by side. The opposing threads of the respective first and / or second bolts enable individual adjustment of the position and alignment of the threads relative to one another. This makes it possible to achieve an overlapping thread alignment of all opposing bolt pairs relative to one another.

[0096] Fig. 11: In an advantageous embodiment of the connecting arrangement, the first component 101 to be connected is connected to the first bolt 102 via a connection 901. The first bolt is connected to a nut 102 via a connection 902. The nut is connected to the second bolt 202 via a connection 903. The second bolt is connected to the second component 201 via a connection 904. All four connections can be form-fitting or material-fitting. At least one of the four connections is a threaded connection. This threaded connection enables length compensation. The distance between the components can thus be freely adjusted. At least one further of the four connections has a form-fitting connection. This can include, but not exclusively, a threaded connection or an undercut. The form-fitting connection enables at least two of the components 102, 1, 202 to be rotated relative to one another.

[0097] In an advantageous embodiment of the connection arrangement, the first connection 901 is a threaded connection, the second and third connections 902, 903 are positive connections, and the fourth connection 904 is a material connection. The nut 1 connects the two bolts via two positive connections. Length adjustment of the connection can be achieved by rotating the first bolt 102.

[0098] In an advantageous embodiment of the connecting arrangement, the second bolt 202 is a component of the second component 201 to be connected.

[0099] In an advantageous embodiment of the connecting arrangement, the nut consists of two half-shells. The positive locking is achieved by placing the two half-shells around the bolts.

[0100] For the purposes of the invention, a thread is including but not exclusively a special design of a positive connection.

[0101] In an advantageous embodiment of the connecting arrangement, the nut is a component of the first or second bolt.

[0102] Fig. 12: Figure 12 illustrates the topic of thread overlap. On a first bolt 102 there is a first thread 15. The thread turns of the first thread describe a first thread helix. There is an imaginary continuation of this first thread helix 30. The imaginary continuation of the thread helix is ​​unlimited. On a second bolt 202 there is a second thread 16 which runs parallel to the first thread. Both threads are geometrically similar and have, among other things, the same thread pitch. The thread turns of the second thread describe a second thread helix. The first and second thread helix are generally not overlapped 31. By shifting the second bolt dl, the imaginary continuation of the first thread can be brought into overlap with the second thread 32. Only when this state of overlap exists can a nut be screwed onto both bolts at the same time.

[0103] Fig. 13: In an advantageous embodiment of the connecting arrangement, the nut 1 is a component of the first bolt 102. The nut and the bolt are integrally connected to one another. The first bolt has a first thread 14 on its component side, which is connected to a second thread 11 of a first component to be connected. The nut has a third thread 13, which is connected to a fourth, nut-side thread 16 of the second bolt 202. The first, second, third and fourth threads 11, 14, 13, 16 are co-rotating. The second bolt has a fifth thread 17 on its component side, which is connected to the sixth thread 12 of the second component to be connected. The fifth and sixth threads are opposite to the first thread.

[0104] The two separate bolts 102, 202 do not have to have opposing right-hand threads. For example, the first bolt 102 can have a purely right-hand thread, while the second bolt 202 has an R / L thread. Both bolts 102, 202 can then be connected via the connecting nut 1 using an R thread. The second bolt 202 can be screwed into its bushing using an L thread. If the second bolt 202 is turned with its L thread, the imaginary helix of its R thread moves translationally. At a favorable point, this helix then covers the corresponding R thread helix of the first bolt 102. The nut 1 can be easily over-screwed. However, the use of a right-hand-left thread in both bolts is advantageous in order to screw over the nut or union nut when there are several bushings lying next to each other.

[0105] LIST OF REFERENCE SYMBOLS

[0106]

Claims

Patent claims 1. Arrangement for prestressing a connecting arrangement (100), in particular for Connecting rotor blade segments (601, 602) of a wind or hydroelectric power plant, with a longitudinal axis (10) which is arranged between at least two components (101, 102) to be connected, containing at least one prestressing element (104, 204) which can apply a prestressing force substantially orthogonal to the longitudinal axis of the connecting arrangement, so that at least two wedges (2, 3, 103, 203) are displaced against each other on at least one sliding plane (21, 22), whereby the Connecting arrangement is prestressed substantially parallel to the longitudinal axis and in which at least one first bolt (102) is screwed into the first component (101) to be connected and at least one second bolt (202) is connected opposite to a second component (201) to be connected, characterized in that the opposing bolts (102, 202) form a bolt pair, the bolts (102, 202) are aligned substantially parallel to the longitudinal axis of the connecting arrangement, at least the first bolt (102) has a component-side side which points in the direction of the first component (101) to be connected, at least the first and second bolts (102, 202) have a nut-side side which points in the direction of a nut (1) and in the direction of the opposite component (101, 201) to be connected, at least the first and second bolts have a connection (902, 903) on the nut-side side and the first and second bolts (102,202) have a component-side connection (901, 904) with the component to be connected (101, 201) and the nut (1) is connected to the first and second bolts (102, 202) via the connections (902, 903) and at least two connections (901, 902, 903, 904) have a positive connection and at least one of these positive connections is a connection (902, 903) of the nut (1) and at least one of the at least two positive connections is a thread., 2. Arrangement according to claim 1, characterized in that the component-side connection of the first bolt (901) is a threaded connection and the nut-side connection (902) of the first bolt is a threaded connection whose thread is opposite to the component-side thread of the first bolt and the nut-side connection of the second bolt (903) is a threaded connection whose thread is opposite to the component-side thread of the first bolt.

3. Arrangement according to claim 1 or 2, characterized in that at least one component for length compensation (301, 302) is located between the components to be connected (101, 102).

4. Arrangement according to claim 3, characterized in that the component for length compensation consists of at least one outer component with internal thread (301) and at least one inner component with external thread (302), which change the total length of the component for length compensation by rotating against each other.

5. Arrangement according to one of the preceding claims, characterized in that the wedges (2, 3) are pressed apart by at least one element with spring properties (401) and are pressed with an outer end face (41) against at least one stop (402).

6. Arrangement according to claim 5, characterized in that at least one of the stops (402) has an undercut (42) so that at least two components of the connecting arrangement (2, 3, 103, 203) can no longer be displaced independently of one another in the direction of the longitudinal axis (10) of the connecting arrangement (100).

7. A method for connecting and prestressing a connecting arrangement (100) by means of an arrangement according to one of the preceding claims, comprising the steps of: Providing the components (102, 202) of the connecting arrangement (100) to be connected; Connecting the at least two bolts (102, 202) to the components (101, 201) to be connected; Connecting the at least one nut (1) to the at least two bolts (102, 202); Displacing the at least two wedges (2, 3, 103, 203) relative to one another by means of at least one prestressing element (104, 204) so ​​that the connecting arrangement (100) is prestressed significantly in the direction of the longitudinal axis (10). Method for prestressing a connecting arrangement (100), preferably using an arrangement according to one of claims 1 to 6, comprising the steps of: providing a first component to be connected (101) with at least one thread (11); Providing a second component to be connected (201) with an advantageous arrangement for connecting a second bolt (12); Providing a first bolt (102) with a component-side thread (14) and a nut-side thread (15) running in the opposite direction thereto; Providing a second bolt (102) having a nut-side thread (16) and an arrangement for connecting to the second component to be connected; Providing at least one nut (1); Connecting the at least two bolts (102, 202) to the components (101, 201) to be connected; - screwing at least one nut (1) onto at least one bolt (102); - aligning the components (101, 201) to be connected to one another; - aligning the threads (15, 16) of the opposing bolts (102, 202) by screwing in or unscrewing at least one of the opposing bolts (102, 202); Connecting the opposing bolts (102, 202) with the nut (1); Prestressing the connecting arrangement (100) significantly in the direction of the longitudinal axis (10).

9. The method according to claim 8, characterized in that the prestressing of the connecting arrangement (100) comprises the following steps: Providing at least two wedges (2, 3, 103, 203); Positioning the wedges (2, 3, 103, 203) between the components (101, 201) to be connected; Moving the wedges (2, 3, 103, 203) relative to one another by means of at least one prestressing element (104, 204) so ​​that the connecting arrangement (100) is prestressed significantly in the direction of the longitudinal axis (10).

10. Method according to claim 7, 8 or 9, characterized by the following steps: Providing a component for length compensation (301, 302); Positioning the component for length compensation (301, 302) between the components to be connected (101, 201); - Compensation of tolerances by changing the length of the component to compensate for length (301, 302).

11. Method according to one of claims 7 to 10, characterized in that the wedges (2, 3) are pressed apart by at least one element with spring properties (401) and pressed with an outer end face (41) against at least one stop (402), with the following working steps: Compressing the wedges (2, 3) against a restoring force; Placing the compressed wedges (2, 3) between the components to be connected (101, 201); Positioning the components (101, 201) of the connecting arrangement (100) in such a way that the wedges (2, 3) can be pressed apart by the spreading force of the elements with spring properties (401) and the wedges (2, 3) are pressed with at least one of their end faces against at least one stop.

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