A connection structure between a wind turbine foundation and a tower and a construction method thereof

Abstract

The present invention relates to the technical field of wind power generation, and in particular to a connection structure and construction method between a wind turbine foundation and a tower, comprising a foundation pile, a foundation platform connected to the foundation pile, a connection device, and a tower flange, wherein the foundation pile is embedded in the foundation platform for connection, the lower end of the connection device is connected to the foundation platform, and the tower flange is connected to the upper end of the connection device, the foundation platform is provided with an annular groove, including a fixed body surrounded by the annular groove, and the outer side wall of the fixed body is provided with a limiting groove; the connection device is arranged in the annular groove, the connection device includes a support body adapted to the fixed body, and a limiting body adapted to the limiting groove is arranged on the first side of the support body; the scheme solves the problem of displacement of the connection device that is easy to occur during hoisting and construction, and achieves the technical effect of improving construction quality, construction efficiency and enhancing structural strength.

Description

Technical field:

[0001] The present invention relates to the technical field of wind power generation, and in particular to a connection structure between a wind turbine foundation and a tower and a construction method. Background technology:

[0002] Wind power generation is the fastest growing green energy technology in the world. While the construction of onshore wind farms is developing rapidly, people have noticed some limitations on the use of onshore wind energy, such as large land area and noise pollution. Due to the abundant offshore wind energy resources and the feasibility of current technology, the ocean will become a rapidly developing wind power market.

[0003] The installation of a wind turbine is usually divided into a foundation installation part and a tower installation part. The two parts are connected by a connecting device, and the installation of the connecting device requires a crane for hoisting. When operating at sea, the connecting device will be affected by ocean currents and sea breezes, and there will be shaking and displacement after being hoisted onto the foundation platform, resulting in the need for secondary positioning during the connection, which reduces construction efficiency and increases construction inconvenience.

[0004] In view of this, the present invention is proposed. Summary of the invention:

[0005] The present invention provides a connection structure between a wind turbine foundation and a tower and a construction method, which can accurately position the connection device when hoisting it without secondary adjustment, and has the effects of simple construction and high connection strength.

[0006] The present invention protects a connection structure between a wind turbine foundation and a tower, including foundation piles, a foundation platform connected to the foundation piles, a connecting device, and a tower flange, wherein the foundation piles are embedded in the foundation platform for connection, the lower end of the connecting device is connected to the foundation platform, and the tower flange is connected to the upper end of the connecting device, the foundation platform is provided with an annular groove, including a fixed body surrounded by the annular groove, and the outer wall of the fixed body is provided with a limiting groove; the connecting device is arranged in the annular groove, the connecting device includes a supporting body adapted to the fixed body, and a limiting body adapted to the limiting groove is arranged on the first side of the supporting body.

[0007] By adopting the above scheme, the foundation piles can be driven into the seabed by a pile driver, and pile holes with the same number as the foundation piles are opened on the bottom surface of the foundation platform, the outer diameter of the pile holes is larger than the outer diameter of the foundation piles, and a grouting channel penetrating the top surface of the foundation platform is arranged on the top of each pile hole, and the connection between the foundation platform and the foundation piles is achieved by grouting through the grouting channel; the annular groove is arranged at the center of the foundation platform, and the depth is less than the height of the foundation platform, and the fixed body is integrally formed with the foundation platform; the connecting device includes a supporting body adapted to the fixed body, which means that the supporting body is arranged on the periphery of the fixed body and has an outer diameter slightly larger than the outer diameter of the fixed body, and the limiting body can be in a meshing connection with the limiting groove, thereby limiting the connecting device.

[0008] Furthermore, the limiting groove is provided with a first magnetic attraction portion, and the limiting body is provided with a second magnetic attraction portion adapted to the first magnetic attraction portion.

[0009] With the above solution, the first magnetic attraction portion can be arranged on the front and / or side of the limiting groove, and the second magnetic attraction portion is also arranged on the front and / or side of the limiting body accordingly. The arrangement of the first magnetic attraction portion and the second magnetic attraction portion can make the connection device more stably placed and more accurately positioned after hoisting, thereby improving the subsequent installation efficiency.

[0010] Furthermore, a first connecting hole is provided on the bottom side of the annular groove, and the connecting device also includes a connecting body and a connecting member connected to the second side of the support body, the connecting body is provided with a second connecting hole arranged longitudinally and adapted to the first connecting hole, and the tower flange is provided with a third connecting hole adapted to the second connecting hole, and the connecting member connects the tower flange, the connecting body and the base platform by being inserted into the third connecting hole, the second connecting hole and the first connecting hole.

[0011] With the above solution, the first connection hole is opened downward from the bottom side of the annular groove and does not pass through the bottom surface of the base platform; the second connection hole can be vertically arranged along the connector and penetrate the upper and lower surfaces of the connector, and the adaptation means that the positions and sizes of the three connection holes, the second connection hole, and the first connection hole correspond to each other, which can meet the insertion requirements of the connector. The solution makes the construction of the base platform, the connection device, and the tower flange connection more convenient and firm.

[0012] Preferably, the connecting member includes a first connecting member, and the first connecting member is sequentially inserted into the third connecting hole, the second connecting hole, and the first connecting hole for connection.

[0013] With the above solution, the third connection hole, the second connection hole and the first connection hole can be provided with internal threads, and the first connection member can be a screw with external threads, which is screwed from top to bottom. The solution is convenient and efficient during construction, and can also ensure the connection strength of the structure.

[0014] Preferably, the connectors are provided in plurality and are spaced apart along the second side of the support body, and a grouting layer is poured between the plurality of connectors.

[0015] By adopting the above scheme, the grouting layer is constructed before the first connecting member connects the third connecting hole, the second connecting hole and the first connecting hole. The pouring of the grouting layer can make the connection between the connecting device and the base platform more tightly and firmly. The figure only shows the structure of one grouting layer. In actual construction, the interval between each connecting body needs to be poured as a grouting layer.

[0016] Preferably, the plurality of connectors are arranged in concentric circles.

[0017] With the above solution, the support bodies are arranged in concentric circles, which makes it more convenient to prefabricate the connection device. The equal spacing between the multiple support bodies also makes the on-site construction process more convenient and improves the construction efficiency.

[0018] Preferably, the support body is provided with a grouting hole connecting the first side and the second side thereof, and the grouting hole is arranged between the plurality of connectors.

[0019] By adopting the above solution, the provision of the grouting holes can enable the concrete in the grouting layer to flow into the gap between the supporting body and the fixing body.

[0020] Specifically, a connecting portion is provided on the upper part of the tower flange, and the upper end of the connecting portion is connected to the tower. The connection structure between the wind turbine foundation and the tower also includes a support rod, one end of the support rod is connected to the tower, and the other end is connected to the upper part of the foundation platform.

[0021] By adopting the above solution, the connection part and the tower flange can be integrally formed during prefabrication, the connection part and the tower can be connected by welding or the like, and the support rod can enhance the bending resistance of the tower.

[0022] Preferably, the support rods are distributed axially symmetrically with the tower as the center.

[0023] By adopting the above solution, the connection structure between the wind turbine foundation and the tower can be subjected to more uniform force when subjected to external force, thereby improving the structural stability.

[0024] Preferably, the included angle between the support rod and the upper side of the base platform is set between 35° and 60°.

[0025] By adopting the above scheme, when the angle is set between 35° and 60°, the bending resistance of the overall structure can be the strongest, thereby ensuring the safety of the structure.

[0026] Preferably, the connecting member includes a second connecting member and a third connecting member, and the first connecting hole and the second connecting hole are both arranged to be distributed in three concentric circles, wherein the middle hole is the middle hole and the rest are side holes, and the second connecting member passes through the first connecting hole and the side holes of the second connecting hole in sequence to connect the connecting device to the base platform, and then the grouting layer is poured so that the upper surface of the grouting layer is lower than the second connecting hole. At this time, the third connecting hole is also arranged to be distributed in three concentric circles, and the third connecting member passes through the middle hole of the third connecting hole to be connected with the middle hole of the second connecting hole, and the side of the third connecting hole is the space to accommodate the top of the second connecting member.

[0027] The present invention also protects a construction method of a connection structure between a wind turbine foundation and a tower, comprising the following steps:

[0028] The pile sinking step involves vertically embedding foundation piles into the seabed rock and soil layer to a set depth in a designated area using a pile driver;

[0029] The pile head processing step is to cut the pile head of each foundation pile flat so that the pile top of each foundation pile is at the same horizontal height;

[0030] A foundation platform installation step, wherein the foundation platform is prefabricated in a factory and connected to the foundation piles by hoisting;

[0031] A connecting device installation step, hoisting the limiting body of the connecting device into the annular groove along the limiting groove;

[0032] A grouting step, performing concrete grouting between the plurality of connectors, wherein the upper surface of the grouting layer is lower than the upper surface of the connector;

[0033] The flange installation step is to hoist the tower flange above the connecting device, align the third connecting hole, the second connecting hole, and the first connecting hole, and connect them by passing the first connecting member through the third connecting hole, the second connecting hole, and the first connecting hole in sequence.

[0034] Beneficial effects of the present invention:

[0035] 1. The arrangement of the limit groove, the limit body and the support body solves the problem of displacement of the connecting device during hoisting and construction, achieving the technical effect of improving construction quality, construction efficiency and enhancing structural strength.

[0036] 2. The provision of the first magnetic attraction portion and the second magnetic attraction portion further solves the problem of displacement and shaking of the connecting device that is prone to occur during construction, thereby achieving the technical effect of improving construction quality, construction efficiency and enhancing structural strength.

[0037] 3. The arrangement of the connecting piece, the third connecting hole, the second connecting hole and the first connecting hole solves the technical problem of loose connection between the tower flange, the connecting device and the foundation platform, and achieves the technical effect of enhancing the overall strength of the structure.

[0038] 4. The provision of the grouting layer further solves the technical problem of the loose connection between the connecting device and the base platform, and produces a technical effect of enhancing the overall strength of the structure.

[0039] 5. The provision of the grouting holes solves the technical problem of a loose connection between the support body and the fixed body due to a gap, and produces a technical effect of enhancing the overall strength of the structure.

[0040] 6. The support rod solves the technical problem of low bending resistance of the tower, and produces a technical effect of improving the bending resistance of the structure. Description of the drawings:

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 This is a schematic diagram of an annular groove in the first embodiment of the present invention;

[0043] Figure 2 for Figure 1 Partial magnification;

[0044] Figure 3 This is a schematic diagram of a connection device according to a first embodiment of the present invention;

[0045] Figure 4 This is a schematic diagram of the cooperation between the connecting device and the fixing body according to the first embodiment of the present invention;

[0046] Figure 5 This is a schematic diagram of a tower flange according to a first embodiment of the present invention;

[0047] Figure 6 for Figure 5 Partial magnification;

[0048] Figure 7 It is a left view of the first embodiment of the present invention;

[0049] Figure 8 This is a schematic diagram of the cooperation between the connecting device and the fixing body according to the second embodiment of the present invention;

[0050] Fig. 9 This is a schematic diagram of a tower flange according to a second embodiment of the present invention.

[0051] Description of reference numerals:

[0052] Through the above-mentioned description of the accompanying drawings, combined with the embodiments of the present invention, the technical solution of the present invention can be more clearly understood and explained.

[0053] 1-foundation pile, 2-foundation platform, 21-annular groove, 211-first connecting hole, 22-fixed body, 221-limiting groove, 2211-first magnetic attraction part, 31-support body, 311-grouting hole, 32-limiting body, 321-second magnetic attraction part, 33-connecting body, 331-second connecting hole, 341-first connecting piece, 342-second connecting piece, 343-third connecting piece, 4-tower flange, 41-third connecting hole, 5-connecting part, 6-tower, 7-support rod, 8-grouting layer. Specific implementation method:

[0054] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0055] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "the" and "the" used in the present invention and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0056] The present invention will be described in detail below through embodiments.

[0057] Implementation Method 1

[0058] refer to Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, a connection structure between a wind turbine foundation and a tower comprises a foundation pile 1, a foundation platform 2 connected to the foundation pile 1, a connecting device, and a tower flange 4, wherein the foundation pile 1 is embedded in the foundation platform 2 for connection, the lower end of the connecting device is connected to the foundation platform 2, and the tower flange 4 is connected to the upper end of the connecting device, the foundation platform 2 is provided with an annular groove 21, and comprises a fixed body 22 surrounded by the annular groove 21, and the outer wall of the fixed body 22 is provided with a limiting groove 221; the connecting device is arranged in the annular groove 21, and the connecting device comprises a supporting body 31 adapted to the fixed body 22, and a limiting body 32 adapted to the limiting groove 221 is arranged on the first side of the supporting body 31.

[0059] By adopting the above scheme, the foundation pile 1 can be driven into the seabed by a pile driver, and pile holes with the same number as the foundation pile 1 are opened on the bottom surface of the foundation platform 2, the outer diameter of the pile hole is larger than the outer diameter of the foundation pile 1, and a grouting channel penetrating the top surface of the foundation platform 2 is arranged on the top of each pile hole, and the connection between the foundation platform 2 and the foundation pile 1 is realized by grouting through the grouting channel; the foundation platform 2 is arranged in a cylindrical shape, the annular groove 21 is arranged at the center of the foundation platform 2, and the depth is less than the height of the foundation platform 2, and the fixed body 22 is integrally formed with the foundation platform 2; the limiting groove 221 is arranged in a groove shape, and the limiting body 32 is arranged in a convex block shape. The connecting device includes a supporting body 31 adapted to the fixed body 22, which means that the supporting body 31 is arranged on the periphery of the fixed body 22 and has an outer diameter slightly larger than the outer diameter of the fixed body 22, and the limiting body 32 can be in a meshing connection with the limiting groove 221, thereby limiting the connecting device.

[0060] Through the coordinated arrangement of the annular groove 21, the fixed body 22, the supporting body 31, the limiting groove 221 and the limiting body 31, the connecting device can be accurately positioned during the lifting process without the need for secondary adjustment and without displacement or shaking due to environmental factors, thereby improving construction efficiency and structural strength.

[0061] refer to Figure 2 , Figure 3 As shown, the limiting groove 221 is provided with a first magnetic attraction portion 2211 , and the limiting body 32 is provided with a second magnetic attraction portion 321 adapted to the first magnetic attraction portion 2211 .

[0062] By adopting the above scheme, the first magnetic attraction part 2211 and the second magnetic attraction part 321 can be made of magnets in the form of magnetic sheets, and fixed to the limiting groove 221 and the limiting body 31 respectively by bolt connection, pin connection, etc.; the position of the first magnetic attraction part 2211 can be set on the front and / or side of the limiting groove 221, and the second magnetic attraction part 321 is also correspondingly set on the front and / or side of the limiting body 31. The setting of the first magnetic attraction part 2211 and the second magnetic attraction part 321 can make the placement of the connecting device more stable and the positioning more accurate after hoisting, thereby improving the subsequent installation efficiency.

[0063] refer to Figure 2 , Figure 3 , Figure 5 , Figure 6 As shown, a first connecting hole 211 is provided on the bottom side of the annular groove 21, and the connecting device also includes a connecting body 33 and a connecting piece connected to the second side of the support body 31, the connecting body 33 is provided with a second connecting hole 331 arranged longitudinally and adapted to the first connecting hole 211, and the tower flange 4 is provided with a third connecting hole 41 adapted to the second connecting hole 331, and the connecting piece connects the tower flange 4, the connecting body 33, and the base platform 2 by being inserted into the third connecting hole 41, the second connecting hole 331, and the first connecting hole 211.

[0064] With the above solution, the first connection hole 211 is opened downward from the bottom side of the annular groove 21 and does not pass through the bottom surface of the base platform 2, which can prevent seawater from corroding the connection piece; the second connection hole 331 can be selected to be vertically arranged along the connection body and pass through the upper and lower surfaces of the connection body 33, and the adaptation means that the positions and sizes of the three connection holes 41, the second connection hole 331, and the first connection hole 211 correspond to each other, which can meet the insertion requirements of the connection piece. The solution makes the construction of the connection between the base platform 2, the connection device, and the tower flange 4 more convenient and firm.

[0065] refer to Figure 5 , Figure 6 As shown, the connecting member includes a first connecting member 341, and the first connecting member 341 is inserted into the third connecting hole 41, the second connecting hole 331, and the first connecting hole 211 in sequence for connection.

[0066] By adopting the above scheme, the third connection hole 41, the second connection hole 331, and the first connection hole 211 can be respectively arranged into three concentric circles with different radii, and distributed on the tower flange 4, the connecting body 33, and the bottom side of the annular groove 21. The third connection hole 41, the second connection hole 331, and the first connection hole 211 can be provided with internal threads, and the first connection member 341 can be a screw with external threads, which is screwed from top to bottom. The scheme is convenient and efficient during construction, and can also ensure the connection strength of the structure.

[0067] refer to Figure 4 As shown, the connectors 33 are provided in plurality and are spaced apart along the second side of the support body 31 , and a grouting layer 8 is poured between the plurality of connectors 33 .

[0068] By adopting the above scheme, a setting form of the connecting body 33 is provided. The connecting body 33 is set as a plurality and arranged at intervals along the second side of the supporting body 31, which can reduce the weight of the connecting device during prefabrication, thereby making it more convenient to transport; before the first connecting member 341 connects the third connecting hole 41, the second connecting hole 331, and the first connecting hole 211, the grouting layer 8 is constructed. At this time, the second connecting hole 331 and the first connecting hole 211 can be covered with a cover plate to prevent concrete clogging. The pouring of the grouting layer 8 can make the connection between the connecting device and the base platform 2 tighter and more firmly. The figure only shows the structure of one grouting layer 8. In actual construction, the interval between each connecting body 33 needs to be poured as a grouting layer 8.

[0069] refer to Figure 4 As shown, the multiple connectors 33 are arranged in concentric circles.

[0070] With the above solution, the support bodies 31 are arranged in concentric circles, which makes it more convenient to prefabricate the connection device. The equal spacing between the multiple support bodies 31 also makes the on-site construction process more convenient and improves the construction efficiency.

[0071] refer to Figure 4 As shown, the support body 31 is provided with a grouting hole 311 connecting the first side and the second side thereof, and the grouting hole 311 is located between the plurality of connectors 33 .

[0072] By adopting the above scheme, the setting of the grouting hole 311 can make the concrete in the grouting layer 8 flow into the gap between the support body 31 and the fixed body 22. Since it is difficult to use a machine to pour concrete into the gap during actual construction, and it is time-consuming and labor-intensive to use manual methods, the concrete in the grouting layer 8 is introduced into the gap. Therefore, the connection between the connecting device and the fixed body 22 can be strengthened, and manpower can be saved to facilitate construction, thereby improving the structural strength and work efficiency.

[0073] refer to Figure 5 , Figure 6 , Figure 7 As shown, a connecting portion 5 is provided on the upper part of the tower flange 4, and a tower 6 is connected to the upper end of the connecting portion 5. The connection structure between the wind turbine foundation and the tower also includes a support rod 7, one end of the support rod 7 is connected to the tower 6, and the other end is connected to the upper part of the foundation platform 2.

[0074] By adopting the above scheme, the connecting part 5 and the tower flange 4 can be integrally formed during prefabrication, the connecting part 5 and the tower 6 can be connected by welding or the like, the supporting rod 7 can enhance the bending resistance of the tower 6, and since the sea breeze is sometimes strong at sea, the supporting rod 7 can enhance the overall strength of the structure.

[0075] refer to Figure 7 As shown, the support rods 7 are axially symmetrically distributed with the tower 6 as the center.

[0076] By adopting the above solution, the connection structure between the wind turbine foundation and the tower can be subjected to more uniform force when subjected to external force, thereby improving the structural stability.

[0077] The included angle between the support rod 7 and the upper side of the base platform 2 is set between 35° and 60°.

[0078] By adopting the above scheme, when the angle is set between 35° and 60°, the bending resistance of the overall structure can be the strongest, thereby ensuring the safety of the structure.

[0079] The present invention also protects a construction method of a connection structure between a wind turbine foundation and a tower, comprising the following steps:

[0080] A pile sinking step, in which a foundation pile 1 is vertically embedded into the seabed rock and soil layer to a set depth in a designated area by a pile driver;

[0081] A pile head processing step, wherein the pile head of each foundation pile 1 is cut flat so that the pile top of each foundation pile 1 is at the same horizontal height;

[0082] The step of installing the foundation platform 2 is that the foundation platform 2 is prefabricated in the factory and connected to the foundation pile 1 by hoisting;

[0083] A connection device installation step, hoisting the limiter 32 of the connection device into the annular groove 21 along the limiter groove 221;

[0084] In the grouting step, concrete grouting is performed between the plurality of connectors 33 , and the upper surface of the grouting layer 8 is lower than the upper surface of the connector 33 .

[0085] Flange installation step: hoist the tower flange 4 above the connecting device, align the third connecting hole 41, the second connecting hole 331, and the first connecting hole 211, and connect them by passing the first connecting member 341 through the third connecting hole 41, the second connecting hole 331, and the first connecting hole 211 in sequence.

[0086] Implementation Method 2

[0087] refer to Figure 8 , Fig. 9 The structure of this embodiment is basically the same as that of embodiment 1, except that: the connecting member includes a second connecting member 342 and a third connecting member 343, the first connecting hole 211 and the second connecting hole 331 are both arranged to be distributed in three concentric circles, wherein the middle hole is the middle hole and the rest are side holes, the second connecting member 342 sequentially passes through the side holes of the first connecting hole 211 and the second connecting hole 331 to connect the connecting device to the base platform 2, and then the grouting layer 8 is poured so that the upper surface of the grouting layer 8 is lower than the second connecting hole 331, at this time, the third connecting hole 41 is also arranged to be distributed in three concentric circles, the third connecting member 343 passes through the middle hole of the third connecting hole 41 to connect with the middle hole of the second connecting hole 331, and the side of the third connecting hole 41 is the space for accommodating the top of the second connecting member 342. The scheme can fix the connecting device before grouting, thereby ensuring that its position will not be moved by grouting during the grouting process.

[0088] In some embodiments of the present invention, the connector 33 can be prefabricated into a ring shape in a factory for direct hoisting.

[0089] It should be pointed out that the foundation pile 1 can be not only the high pile cap foundation but also a single pile cap foundation. In addition, the foundation cap 2 and the foundation pile 1 can also be replaced by a jacket foundation, the jacket includes a plurality of brackets and a jacket platform connected to the top of the bracket, the fixed body 22 can be made of steel, the annular groove 221 is provided on the jacket platform, and the connecting device is arranged in the annular groove 221 and connected to the tower flange 4.

[0090] It should be pointed out that, for those skilled in the art, several improvements and modifications may be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A connection structure between a wind turbine foundation and a tower, characterized in that: The invention comprises a foundation pile (1), a foundation platform (2) connected to the foundation pile (1), a connecting device, and a tower flange (4), wherein the foundation pile (1) is embedded in the foundation platform (2) for connection, the lower end of the connecting device is connected to the foundation platform (2), and the tower flange (4) is connected to the upper end of the connecting device, the foundation platform (2) is provided with an annular groove (21), and comprises a fixed body (22) surrounded by the annular groove (21), and the outer wall of the fixed body (22) is provided with a limiting groove (221); the connecting device is arranged in the annular groove (21) ), the connecting device comprising a supporting body (31) adapted to the fixing body (22), a limiting body (32) adapted to the limiting groove (221) being provided on a first side of the supporting body (31), the limiting groove (221) being provided with a first magnetic attraction portion (2211), the limiting body (32) being provided with a second magnetic attraction portion (321) adapted to the first magnetic attraction portion (2211), a first connecting hole (211) being provided on a bottom side of the annular groove (21), the connecting device further comprising a connecting body (33) connected to the second side of the supporting body (31) and A connecting piece, wherein the connecting body (33) is provided with a second connecting hole (331) arranged in the longitudinal direction and adapted to the first connecting hole (211), the tower flange (4) is provided with a third connecting hole (41) adapted to the second connecting hole (331), the connecting piece connects the tower flange (4), the connecting body (33) and the base platform (2) by inserting into the third connecting hole (41), the second connecting hole (331) and the first connecting hole (211), the connecting body (33) is provided in plurality and is arranged at intervals along the second side of the support body (31), the connecting piece A grouting layer (8) is poured between the multiple connecting bodies. The third connecting hole (41), the second connecting hole (331), and the first connecting hole (211) are respectively arranged to form three concentric circles with different radii and are distributed on the bottom side of the tower flange (4), the connecting body (33), and the annular groove (21). Internal threads are arranged in the third connecting hole (41), the second connecting hole (331), and the first connecting hole (211). The connecting member includes a first connecting member (341), which is a screw with external threads and is screwed from top to bottom.

2. The connection structure between the wind turbine foundation and the tower according to claim 1, characterized in that: The multiple connectors (33) are arranged in concentric circles.

3. The connection structure between the wind turbine foundation and the tower according to claim 2, characterized in that: The support body (31) is provided with a grouting hole (311) communicating with the first side and the second side thereof, and the grouting hole (311) is arranged between the plurality of connectors (33).

4. The connection structure between the wind turbine foundation and the tower according to any one of claims 1 to 3, characterized in that: A connecting portion (5) is provided on the upper portion of the tower flange (4), the upper end of the connecting portion (5) being connected to the tower (6), and the connecting structure between the wind turbine foundation and the tower further comprising a support rod (7), one end of the support rod (7) being connected to the tower (6) and the other end being connected to the upper portion of the foundation platform (2).

5. The connection structure between the wind turbine foundation and the tower according to claim 4 is characterized in that: The support rods (7) are distributed in an axisymmetric manner with the tower (6) as the center.

6. A construction method for the connection structure between a wind turbine foundation and a tower as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: A pile sinking step, in which a foundation pile (1) is vertically embedded into the seabed rock and soil layer to a set depth in a designated area by a pile driver; A pile head processing step, wherein the pile head of each foundation pile (1) is cut flat so that the pile top of each foundation pile (1) is at the same horizontal height; A step of installing a foundation platform (2), wherein the foundation platform (2) is prefabricated in a factory, and the foundation platform (2) is connected to the foundation pile (1) by hoisting; A connection device installation step, hoisting the limiting body (32) of the connection device along the limiting groove (221) into the annular groove (21); Grouting step: performing concrete grouting between the plurality of connectors (33), wherein the upper surface of the grouting layer (8) is lower than the upper surface of the connector (33); Flange installation steps: hoist the tower flange (4) above the connection device, align the third connection hole (41), the second connection hole (331), and the first connection hole (211), and connect them by passing the first connection member (341) through the third connection hole (41), the second connection hole (331), and the first connection hole (211) in sequence.

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