Construction assembly and construction method for offshore installation of inner platform of fan foundation

Abstract

The invention relates to the technical field of offshore wind power, and discloses a construction assembly and a construction method for offshore installation of an inner platform of a fan foundation. According to the construction assembly provided by the invention, the first sliding groove structure in the shape of the long-strip-shaped sliding groove, the sliding structure and the connecting piece are arranged between the top flange and the bracket of the fan foundation, so that guidance is provided for the sliding structure to drive the inner platform to move; the inner platform can accurately move to the bracket along a preset path in the long-strip-shaped sliding groove in the installation process, deviation or dislocation of the inner platform caused by complex sea conditions such as waves, tides and strong wind is avoided, and then collision between the inner platform and the inner wall of the flange and the inner wall of the fan foundation is avoided. Any one of the inner platform, the fan foundation and the flange is prevented from being damaged when the inner platform collides with the inner wall of the fan foundation and the flange in the mounting process, and the safety of constructors and equipment is ensured. Meanwhile, after the inner platform is installed, the guide mechanism can be detached, and follow-up repeated use is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power generation, and in particular to a construction component and a construction method for offshore installation of a platform within a wind turbine foundation. Background Art

[0002] Offshore wind power is regarded as a key technology to solve the problem of utilizing deep-sea wind energy resources. During the installation of offshore wind power generation equipment, the precise lifting of the inner platform of the wind turbine foundation is a key step to ensure the stability of the entire structure and the safety of subsequent operation. Since the inner platform of the wind turbine foundation is generally located below the top flange surface of the foundation, in order to ensure that the inner platform can slide smoothly into the foundation without hindrance, the diameter of the inner platform needs to be designed to be slightly smaller than the inner diameter of the flange. When the inner platform passes through the flange surface, a narrow annular gap is formed between the inner platform and the flange surface in the radial direction. The narrow annular gap places extremely high precision requirements on the lifting operation of the inner platform, that is, it must remain stable during the lifting and translation process to prevent the inner platform from accidentally contacting the inner wall of the wind turbine foundation at the edge of the flange, thereby avoiding damage to the inner platform structure.

[0003] However, due to the particularity of the marine environment, during the process of installing the inner platform of the wind turbine foundation at sea through the top flange and other components to enter the internal space of the wind turbine foundation, complex sea conditions such as waves, tides, and strong winds will have a greater impact on the lifting and positioning process. There is a possibility that the inner platform will collide with the flange or the inner wall of the wind turbine foundation, causing damage to at least one of the inner platform, flange or wind turbine foundation. Summary of the invention

[0004] In view of this, the present invention provides a construction assembly and a construction method for offshore installation of an inner platform of a wind turbine foundation, so as to solve the problem of collision between the inner platform and the flange or the inner wall of the wind turbine foundation due to the influence of sea conditions such as waves, tides and strong winds during the offshore installation of the inner platform.

[0005] In the first aspect, the present invention provides a construction assembly for offshore installation of an inner platform of a wind turbine foundation, comprising a wind turbine foundation, a bracket, a flange and an inner platform, wherein the wind turbine foundation is a cylindrical structure and is vertically installed in the sea, with its bottom end inserted into the seabed and its top exposed above the sea surface; the bracket is installed on the inner wall of the wind turbine foundation, and a plurality of brackets are provided, and the plurality of brackets are arranged at intervals in the circumferential direction; the flange is installed on the top of the wind turbine foundation; the radial dimension of the inner platform is smaller than the radial dimension of the inner wall of the wind turbine foundation; the construction assembly also includes a connecting member and a guide mechanism, and the connecting member is installed at the outer edge of the inner platform; the guide mechanism is provided with a first slide groove structure and a sliding structure, the first slide groove structure is an elongated slide groove extending along the axial direction of the wind turbine foundation, the elongated slide groove extends from the top of the flange to the bracket, and the two end surfaces of the slide groove arranged along the axial direction of the wind turbine foundation are both provided with openings, the fixed end of the sliding structure is connected to the connecting member, the sliding end of the sliding structure enters and exits the slide groove at the opening of the first slide groove structure, and the sliding end of the sliding structure slides in the slide groove.

[0006] Beneficial effect: By providing a wind turbine foundation, a corbel, a flange and an inner platform, a scheme in which the inner platform passes through the top flange and other components to enter the inside of the wind turbine foundation until it is located on the top of the corbel in a conventional scheme is constituted, and a first slide groove structure, a sliding structure and a connecting piece in the form of a long slide groove are provided between the top end of the flange of the wind turbine foundation and the corbel, a guide is provided for the movement process of the inner platform driven by the sliding structure, which helps the inner platform to accurately move to the corbel along the preset path in the long slide groove during installation, avoiding the displacement or dislocation of the inner platform due to complex sea conditions such as waves, tides, strong winds, etc., and further avoiding the collision of the inner platform with the flange and the inner wall of the wind turbine foundation, preventing the inner platform from colliding with the inner wall or flange of the wind turbine foundation during installation, causing any of the inner platform, wind turbine foundation or flange to be damaged, thereby ensuring the safety of construction personnel and equipment. At the same time, the setting of the guide mechanism can simplify the installation steps of the inner platform. The operator can easily guide the inner platform from the outside of the fan foundation to the bracket inside the fan foundation by controlling the movement of the sliding structure in the slide slot, without the need for complex adjustment operations, which helps to improve construction efficiency. At the same time, after the installation of the inner platform is completed, the guide mechanism can be removed to facilitate subsequent reuse.

[0007] In an optional embodiment, the guide mechanism also includes a second slide groove structure, which is a guide groove extending at least along the axial direction of the fan foundation, and the guide groove extends from the outside of the fan foundation to the opening. The guide groove is connected to the opening, and in the direction extending from the outside of the fan foundation to the opening, the groove width of the guide groove gradually decreases and decreases to the groove width of the slide groove of the first slide groove structure.

[0008] Beneficial effect: By providing a second slide groove structure, and setting the second slide groove structure as a guide groove extending at least along the axial direction of the fan foundation, since the groove width of the guide groove in the direction extending from the outside of the fan foundation to the opening is gradually reduced, and the minimum value is the groove width of the slide groove of the first slide groove structure, the guide groove can guide the inner platform along the correct path in the initial landing stage, and guide the sliding structure to the opening for position limiting, ensuring that the sliding structure can smoothly enter the slide groove of the first slide groove structure, and move to the bracket along the guide of the slide groove. That is, by setting the second slide groove structure, the interruption and waiting time of the inner platform in the process of landing can be reduced, thereby improving the installation efficiency of the inner platform.

[0009] In an optional embodiment, the guide groove also extends along the radial direction of the wind turbine foundation.

[0010] Beneficial effect: By extending the guide groove along the axial direction of the fan foundation and the radial direction of the fan foundation, a three-dimensional precise guide can be provided for the sliding structure during the installation of the inner platform, so that the inner platform can not only be accurately guided to the vicinity of the fan foundation in the axial direction, but also be fine-tuned to the optimal position in the radial direction. At the same time, it helps the operator to more accurately determine the real-time position and state of the inner platform during the installation process, and allows the operator to minimize installation errors and deviations, ensuring that the inner platform is accurately installed to the top of the bracket.

[0011] In an optional embodiment, the guide mechanism also includes a positioning structure, which is fixedly mounted on the second slide groove structure. In the positioning structure and the flange, one of them is provided with a positioning through hole, and the other is provided with a positioning protrusion, and the positioning protrusion is used to be installed in the positioning through hole.

[0012] Beneficial effect: By providing a positioning structure, installing the positioning structure at the second slide groove structure, and setting the installation relationship between the positioning structure and the flange in the form of the positioning protrusion installed in the positioning through hole, the second slide groove structure and the flange can be accurately aligned, preventing the phenomenon that the slide groove of the second slide groove structure cannot accurately guide the sliding structure at the outer edge of the inner platform due to installation deviation, reducing safety hazards, and ensuring the stability and reliability of the inner platform installation. At the same time, the installation process between the second slide groove structure and the flange can be simplified, that is, the operator only needs to align the positioning protrusion with the positioning through hole and insert it into the positioning through hole, without the need for complex adjustment and calibration operations, reducing the risk of incorrect installation of the second slide groove structure due to improper operation of personnel.

[0013] In an optional embodiment, the guide mechanism also includes a connecting structure; a plurality of second slide groove structures are provided, and the plurality of second slide groove structures are evenly distributed in the circumferential direction around the central axis of the wind turbine foundation, and two adjacent second slide groove structures are connected by a connecting structure.

[0014] Beneficial effect: When multiple second slide groove structures are evenly distributed in the circumferential direction around the central axis of the wind turbine foundation and connected to each other through a connecting structure, a more stable guide frame can be formed, so that the guide frame can be installed and disassembled as a whole, simplifying the installation and maintenance process of the construction components. At the same time, the extension direction and position of each slide groove are accurately determined, preventing the sliding structure from detaching from the slide groove, which helps to ensure that the sliding structure can move along a known path when moving.

[0015] In an optional embodiment, the inner platform includes a structural beam, and the structural beam is provided with a mounting portion, and the mounting portion is used to install a connecting piece.

[0016] Beneficial effect: By making the structural beam as the main load-bearing component of the inner platform and installing connecting parts on the installation part of the structural beam, since the fixed end of the sliding structure is installed on the connecting parts, the sliding structure can provide guidance for the structural beam when moving, and drive the structural beam to move to the corbel along the preset installation trajectory.

[0017] In an optional embodiment, the sliding structure is a pulley, and the pulley is rotatably mounted on the connecting member; wherein the rotation center of the pulley is arranged on a side of the first slide groove structure close to the central axis of the fan foundation along the radial direction of the central axis of the fan foundation.

[0018] Beneficial effect: By selecting the sliding structure as a pulley, the friction and resistance between the sliding groove and the sliding groove can be reduced, so that the inner platform moves more smoothly and achieves efficient placement. At the same time, by setting the rotation center of the pulley along the radial direction of the central axis of the fan foundation on the side of the first sliding groove structure close to the central axis of the fan foundation, it is convenient to quickly install or remove the sliding structure at the sliding groove.

[0019] In the second aspect, the present invention also provides a construction method for offshore installation of an inner platform of a wind turbine foundation, which is applied to the construction components for offshore installation of an inner platform of a wind turbine foundation provided in the first aspect, and the construction method comprises the following steps: prefabrication: completing the prefabrication of the construction components in the factory; hoisting: completing the fixation of the wind turbine foundation at sea, hoisting the inner platform and moving the inner platform to the top flange surface; adjustment: aligning the sliding end of the sliding structure with the opening; positioning: gradually lowering the inner platform until the inner platform falls onto the corbel; dismantling: dismantling the fixed end of the sliding structure installed on the flange.

[0020] Beneficial effect: Because the construction method for offshore installation of a platform within a wind turbine foundation is applied to the construction components for offshore installation of a platform within a wind turbine foundation provided in the first aspect, the effect is brought about by the construction components for offshore installation of a platform within a wind turbine foundation, and therefore, it will not be described in detail here.

[0021] In an optional embodiment, the prefabrication step includes: a flange is welded to the top of the fan foundation; a guide device consisting of a first slide groove structure and a second slide groove structure is pre-installed on the top of the flange; a connecting piece is welded at the outer edge of the inner platform, and a sliding end of the sliding structure is installed on the connecting piece.

[0022] In an optional embodiment, the hoisting step includes: using a construction ship to install the wind turbine foundation with a flange in the sea; hoisting the guide mechanism on the construction ship and moving it to the flange, and controlling the cables and wind ropes to adjust the positions of each positioning structure to complete the installation of the positioning structure and the flange; hoisting the inner platform on the construction ship and controlling the cables and wind ropes so that the sliding structure can smoothly slide into the slide groove through the opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the specific implementation modes of the present invention, the drawings required for use in the description of the specific implementation modes will be briefly introduced below. Obviously, the drawings described below are some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A three-dimensional schematic diagram of a construction assembly for offshore installation of a platform within a wind turbine foundation provided by the present invention;

[0025] Figure 2 A partially enlarged schematic diagram of the inner platform of the construction assembly for offshore installation of the inner platform of the wind turbine foundation provided by the present invention sliding on the first slide groove structure through the sliding structure;

[0026] Figure 3 A three-dimensional schematic diagram of a construction assembly for offshore installation of an inner platform of a wind turbine foundation provided by the present invention, wherein a sliding structure is installed at the outer edge of the inner platform through a connecting piece;

[0027] Figure 4 A schematic flow chart of a construction method for offshore installation of a platform within a wind turbine foundation provided by the present invention.

[0028] Description of reference numerals:

[0029] 1. Fan foundation;

[0030] 2. Flange;

[0031] 3. Inner platform; 31. Structural beam; 311. Installation part;

[0032] 4. Connectors;

[0033] 5. Guide mechanism; 51. First slide groove structure; 511. Opening; 52. Sliding structure; 53. Second slide groove structure; 54. Positioning structure; 55. Connecting structure;

[0034] 6. Ox leg. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] Combine the following Figures 1 to 4 , describing an embodiment of the present invention.

[0040] According to an embodiment of the present invention, on the one hand, a construction assembly for offshore installation of an inner platform of a wind turbine foundation is provided, comprising a wind turbine foundation 1, a corbel 6, a flange 2 and an inner platform 3. Consistent with the existing scheme, the wind turbine foundation 1 is a cylindrical structure and is vertically installed in the sea, with its bottom end inserted into the seabed and its top exposed above the sea surface; the corbel 6 is installed on the inner wall of the wind turbine foundation 1, and a plurality of corbels 6 are provided, and the plurality of corbels 6 are spaced apart in the circumferential direction; the flange 2 is installed on the top of the wind turbine foundation 1; the radial dimension of the inner platform 3 is smaller than the radial dimension of the inner wall of the wind turbine foundation 1.

[0041] In order to accurately guide and place the inner platform 3 on the top of the bracket 6, Figures 1 to 3 As shown, the construction assembly further includes a connecting member 4 and a guide mechanism 5 .

[0042] Specifically, the connecting member 4 is installed at the outer edge of the inner platform 3; the guide mechanism 5 is provided with a first slide groove structure 51 and a sliding structure 52, the first slide groove structure 51 is a long slide groove extending along the axial direction of the fan foundation 1, the long slide groove extends from the top of the flange to the bracket 6, and the two end surfaces of the slide groove arranged along the axial direction of the fan foundation 1 are provided with openings 511, the fixed end of the sliding structure 52 is connected to the connecting member 4, the sliding end of the sliding structure 52 enters and exits the slide groove at the opening 511 of the first slide groove structure 51, and the sliding end of the sliding structure 52 slides in the slide groove.

[0043] By providing the wind turbine foundation 1, the corbel 6, the flange 2 and the inner platform 3, a conventional scheme is constituted in which the inner platform 3 passes through the top flange 2 and other components to enter the inside of the wind turbine foundation 1 until it is located on the top of the corbel 6. In addition, by providing a first slide groove structure 51, a sliding structure 52 and a connecting member 4 in the form of an elongated slide groove between the top of the flange of the wind turbine foundation 1 and the corbel 6, a guide is provided for the movement process of the inner platform 3 driven by the sliding structure 52, which helps the inner platform 3 to accurately move to the corbel 6 along the preset path in the elongated slide groove during installation, thereby avoiding the displacement or dislocation of the inner platform 3 due to complex sea conditions such as waves, tides, strong winds, etc., and further avoiding the collision between the inner platform 3 and the inner wall of the flange 2 and the wind turbine foundation 1, and preventing the inner platform 3 from colliding with the inner wall of the wind turbine foundation 1 or the flange 2 during installation, causing any of the inner platform 3, the wind turbine foundation 1 or the flange 2 to be damaged, thereby ensuring the safety of construction personnel and equipment.

[0044] At the same time, the setting of the guide mechanism 5 can simplify the installation steps of the inner platform 3. The operator only needs to control the movement of the sliding structure 52 in the slide groove to easily guide the inner platform 3 from the outside of the fan foundation 1 to the bracket 6 inside the fan foundation 1. There is no need to perform complicated adjustment operations, which helps to improve construction efficiency.

[0045] It can be explained that there is no specific limitation on the structure of the first slide groove structure 51 , and it can be an integrated structure or a split structure.

[0046] For example, in the present application, the first chute structure 51 is a split structure as a whole, and is formed by two steel plates arranged at intervals to enclose and form the chute.

[0047] It can be explained that the guiding direction of the inner platform 3 by the guiding mechanism 5 provided in the present application is at least one of the axial direction of the wind turbine foundation 1 and the radial direction of the wind turbine foundation 1 .

[0048] As one implementation manner, the guide mechanism 5 guides the inner platform 3 in the axial direction of the wind turbine foundation 1 .

[0049] Specifically, if Figure 1 and Figure 2 As shown, the guide mechanism 5 also includes a second slide groove structure 53, which is a guide groove extending at least along the axial direction of the fan foundation 1, and the guide groove extends from the outside of the fan foundation 1 to the opening 511. The guide groove is connected to the opening 511, and in the direction extending from the outside of the fan foundation 1 to the opening 511, the groove width of the guide groove gradually decreases and decreases to the groove width of the slide groove of the first slide groove structure 51.

[0050] By providing a second slide groove structure 53, and setting the second slide groove structure 53 as a guide groove extending at least along the axial direction of the fan foundation 1, since the groove width of the guide groove in the direction extending from the outside of the fan foundation 1 to the opening 511 is gradually reduced, and the minimum value is the groove width of the first slide groove structure 51, the guide groove can guide the inner platform 3 along the correct path in the initial landing stage, and until the sliding structure 52 is guided to the opening 511 for positioning, it is ensured that the sliding structure 52 can smoothly enter the slide groove of the first slide groove structure 51, and move to the bracket 6 along the guide of the slide groove. That is, by setting the second slide groove structure 53, the interruption and waiting time of the inner platform 3 in the process of landing can be reduced, thereby improving the installation efficiency of the inner platform 3.

[0051] Of course, the guide groove may also extend along the radial direction of the wind turbine foundation 1 .

[0052] By extending the guide groove along the radial direction of the fan foundation 1 in addition to the axial direction of the fan foundation 1, a precise guide in a three-dimensional space can be provided for the sliding structure 52 during the installation of the inner platform 3, so that the inner platform 3 can not only be accurately guided to the vicinity of the fan foundation 1 in the axial direction, but also be fine-tuned to the optimal position in the radial direction. At the same time, it helps the operator to more accurately determine the real-time position and state of the inner platform 3 during the installation process, and allows the operator to minimize installation errors and deviations, ensuring that the inner platform 3 is accurately installed on the top of the bracket 6.

[0053] like Figure 1 and Figure 2 As shown, the guide mechanism 5 also includes a positioning structure 54, which is fixedly installed on the second slide groove structure 53. In the positioning structure 54 and the flange 2, one of them is provided with a positioning through hole, and the other is provided with a positioning protrusion, which is used to be installed in the positioning through hole.

[0054] By providing a positioning structure 54, installing the positioning structure 54 at the second slide groove structure 53, and setting the installation relationship between the positioning structure 54 and the flange 2 in the form of a positioning protrusion installed in the positioning through hole, the second slide groove structure 53 can be accurately aligned with the flange 2, preventing the slide groove of the second slide groove structure 53 from being unable to accurately guide the sliding structure 52 at the outer edge of the inner platform 3 due to installation deviation, reducing safety hazards, and ensuring the stability and reliability of the installation of the inner platform 3.

[0055] At the same time, the installation process between the second slide groove structure 53 and the flange 2 can also be simplified. That is, the operator only needs to align the positioning protrusion with the positioning through hole and insert it into the positioning through hole. There is no need to perform complicated adjustment and calibration operations, which reduces the risk of incorrect installation of the second slide groove structure 53 due to improper operation.

[0056] It can be explained that, in the above embodiments, there is no specific limitation on the cross-sectional shape of the positioning protrusion and the positioning through hole, and they may be square, such as triangle, square, rectangle, pentagon, etc., or circular.

[0057] Preferably, the positioning protrusion is a cylindrical protrusion, and the positioning through hole is a circular through hole.

[0058] In addition, it should be noted that the number of the second slide groove structures 53 corresponds to the number of the positioning structures 54 , for example, one-to-one correspondence or proportional correspondence, that is, one group of positioning structures 54 corresponds to one second slide groove structure 53 , and one second slide groove structure 53 corresponds to two or more positioning structures 54 .

[0059] It can be explained that, in the above embodiment, the number of the second sliding groove structures 53 is not specifically limited, and can be one, two or more.

[0060] When the number of the second slide groove structure 53 is one, there is only one positioning structure 54 . During installation, the installation of the second slide groove structure 53 can be completed by only installing the positioning structure 54 on the flange 2 .

[0061] Of course, in other optional embodiments, when there are multiple second slide groove structures 53, that is, two or more, the guide mechanism 5 also includes a connecting structure 55; the multiple second slide groove structures 53 are evenly distributed in the circumferential direction around the central axis of the wind turbine foundation 1, and two adjacent second slide groove structures 53 are connected by the connecting structure 55.

[0062] When multiple second slide groove structures 53 are evenly distributed in the circumferential direction around the central axis of the wind turbine foundation 1 and are interconnected by the connecting structure 55, a more stable guide frame can be formed, so that the guide frame can be installed and disassembled as a whole, simplifying the installation and maintenance process of the construction components. At the same time, the extension direction and position of each slide groove are accurately determined, preventing the sliding structure 52 from detaching from the slide groove, which helps to ensure that the sliding structure 52 can move along a known path when moving.

[0063] It can be explained that, in the above embodiment, the structure of the connection structure 55 is not specifically limited, and it is sufficient that two adjacent second slide groove structures 53 are connected.

[0064] Preferably, the connection structure 55 is an arc-shaped steel bar structure, so that the guide frame formed by connecting the plurality of second slide groove structures 53 presents an arc shape as a whole.

[0065] like Figure 1 and Figure 3 As shown, the inner platform 3 includes a structural beam 31 , and the structural beam 31 is provided with a mounting portion 311 , and the mounting portion 311 is used for mounting the connecting member 4 .

[0066] By making the inner platform 3 include a structural beam 31, making the structural beam 31 the main load-bearing component of the inner platform 3, installing the connecting member 4 on the mounting portion 311 of the structural beam 31, and since the fixed end of the sliding structure 52 is installed on the connecting member 4, the sliding structure 52 can provide guidance for the structural beam 31 when moving, and drive the structural beam 31 to move to the corbel 6 along the preset installation trajectory.

[0067] It can be explained that the number of the mounting portions 311 corresponds to the number of the sliding structures 52 and the first sliding groove structures 51 , preferably a one-to-one correspondence.

[0068] It can be explained that the sliding structure 52 is preferably a pulley, which is rotatably mounted on the connecting member 4; wherein the rotation center of the pulley is arranged on one side of the first slide groove structure 51 close to the central axis of the fan foundation 1 along the radial direction of the central axis of the fan foundation 1.

[0069] By selecting the sliding structure 52 as a pulley, the friction and resistance between the sliding groove and the sliding groove can be reduced, so that the inner platform 3 moves more smoothly and achieves efficient placement. At the same time, by setting the rotation center of the pulley along the radial direction of the central axis of the fan foundation 1 on the side of the first sliding groove structure 51 close to the central axis of the fan foundation 1, it is convenient to quickly install or remove the sliding structure 52 at the sliding groove.

[0070] The sliding end of the sliding structure 52 is a wheel body, and the fixed end of the sliding structure 52 is a rotating shaft. At this time, the rotating shaft is fixedly connected to the connecting member 4, and the wheel body 52 is rotatably installed on the rotating shaft.

[0071] Of course, in other optional implementations, the sliding structure 52 can also be selected as a T-shaped slider, and in this case the T-shaped slider slides in the sliding groove.

[0072] According to an embodiment of the present invention, on the other hand, a construction method for offshore installation of a platform within a wind turbine foundation is provided, which is applied to the construction assembly for offshore installation of a platform within a wind turbine foundation provided in the previous aspect.

[0073] like Figure 4 As shown, the construction method includes the following steps: prefabrication: completing the prefabrication of construction components in the factory; hoisting: completing the fixation of the wind turbine foundation 1 at sea, hoisting the inner platform 3 and moving the inner platform 3 to the surface of the flange 2 at the top of the wind turbine foundation 1; adjustment: aligning the sliding end of the sliding structure 52 with the opening 511; landing: gradually lowering the inner platform 3 until the inner platform 3 falls onto the bracket 6.

[0074] Among them, the prefabrication steps include: the flange is welded on the top of the fan foundation 1; the guide mechanism 5 composed of the first slide groove structure 51 and the second slide groove structure 53 is pre-installed on the top of the flange; the connecting piece 4 is welded at the outer edge of the inner platform 3, and the sliding end of the sliding structure 52 is installed on the connecting piece 4.

[0075] It should be noted that when installing the flange 2 , the flange 2 is welded to the top of the fan foundation 1 .

[0076] It may be noted that the prefabrication step is completed in an onshore manufacturing plant.

[0077] Similarly, the hoisting steps include: using a construction ship to install the wind turbine foundation 1 with the flange 2 in the sea; hoisting the guide mechanism 5 on the construction ship, and moving it to the flange 2, and controlling the cables and wind ropes to adjust the positions of each positioning structure 54 to complete the installation of the positioning structure 54 and the flange 2; hoisting the inner platform 3 on the construction ship, and controlling the cables and wind ropes so that the sliding structure 52 can smoothly slide into the slide groove through the opening 511.

[0078] It should be noted that in the step of hoisting the guide mechanism 5, the guy rope is controlled to adjust the approximate angle, and then the operator manually or operates a related adjustment device, such as a rod-shaped adjustment member, so that the positioning protrusion can pass through the positioning through hole.

[0079] It should be noted that, when installing the fan foundation 1 , the flange 2 is installed on the top end surface of the fan foundation 1 .

[0080] It should be noted that, during the positioning process, the sliding structure 52 will gradually and accurately move to the designed installation position along the gradually narrowing slot, and finally accurately position on the corbel 6 along the guidance of the slide groove.

[0081] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A construction assembly for offshore installation of an inner platform of a wind turbine foundation, comprising a wind turbine foundation (1), a bracket (6), a flange (2) and an inner platform (3), wherein the wind turbine foundation (1) is a cylindrical structure and is vertically installed in the sea, with its bottom end inserted into the seabed and its top exposed above the sea surface; the bracket (6) is installed on the inner wall of the wind turbine foundation (1), a plurality of brackets (6) are provided, and the plurality of brackets (6) are arranged at intervals in the circumferential direction; the flange (2) is installed on the top of the wind turbine foundation (1); the radial dimension of the inner platform (3) is smaller than the radial dimension of the inner wall of the wind turbine foundation (1); and it is characterized in that: The construction components also include: A connecting member (4), wherein the connecting member (4) is installed at the outer edge of the inner platform (3); A guide mechanism (5), wherein the guide mechanism (5) is provided with a first slide groove structure (51) and a sliding structure (52), wherein the first slide groove structure (51) is a long slide groove extending along the axial direction of the fan foundation (1), the long slide groove extending from the top of the flange to the bracket (6), and both end surfaces of the slide groove arranged along the axial direction of the fan foundation (1) are provided with openings (511), the fixed end of the sliding structure (52) is connected to the connecting member (4), the sliding end of the sliding structure (52) enters and exits the slide groove at the opening (511) of the first slide groove structure (51), and the sliding end of the sliding structure (52) slides in the slide groove.

2. The construction assembly for offshore installation of a platform within a wind turbine foundation according to claim 1, characterized in that: The guide mechanism (5) further comprises a second slide groove structure (53), wherein the second slide groove structure (53) is a guide groove extending at least along the axial direction of the fan foundation (1), wherein the guide groove extends from the outside of the fan foundation (1) to the opening (511), and the guide groove is connected to the opening (511). In the direction extending from the outside of the fan foundation (1) to the opening (511), the groove width of the guide groove gradually decreases and decreases to the groove width of the slide groove of the first slide groove structure (51).

3. The construction assembly for offshore installation of a platform within a wind turbine foundation according to claim 2, characterized in that: The guide groove also extends along the radial direction of the fan foundation (1).

4. The construction assembly for offshore installation of a platform within a wind turbine foundation according to claim 2, characterized in that: The guide mechanism (5) further comprises a positioning structure (54), wherein the positioning structure (54) is fixedly mounted on the second slide groove structure (53), wherein one of the positioning structure (54) and the flange (2) is provided with a positioning through hole, and the other is provided with a positioning protrusion, wherein the positioning protrusion is used to be mounted in the positioning through hole.

5. The construction assembly for offshore installation of a platform within a wind turbine foundation according to any one of claims 2 to 4, characterized in that: The guiding mechanism (5) further comprises a connecting structure (55); A plurality of the second slide groove structures (53) are provided, and the plurality of the second slide groove structures (53) are evenly distributed in the circumferential direction around the central axis of the fan foundation (1), and two adjacent second slide groove structures (53) are connected via a connecting structure (55).

6. The construction assembly for offshore installation of a platform within a wind turbine foundation according to any one of claims 1 to 4, characterized in that: The inner platform (3) comprises a structural beam (31), the structural beam (31) is provided with a mounting portion (311), and the mounting portion (311) is used to mount a connecting piece (4).

7. The construction assembly for offshore installation of a platform within a wind turbine foundation according to any one of claims 1 to 4, characterized in that: The sliding structure (52) is a pulley, and the pulley is rotatably mounted on the connecting member (4); The rotation center of the pulley is arranged on a side of the first slide groove structure (51) close to the central axis of the fan foundation (1) along the radial direction of the central axis of the fan foundation (1).

8. A construction method for offshore installation of a platform within a wind turbine foundation, applied to the construction assembly for offshore installation of a platform within a wind turbine foundation as claimed in any one of claims 1 to 7, characterized in that: The construction method comprises the following steps: Prefabrication: Prefabrication of construction components is completed in the factory; Hoisting: Fixing the wind turbine foundation (1) at sea, hoisting the inner platform (3) and moving the inner platform (3) to the surface of the flange (2) at the top of the wind turbine foundation (1); Adjustment: aligning the sliding end of the sliding structure (52) with the opening (511); Dropping: gradually lowering the inner platform (3) until the inner platform (3) falls onto the corbel (6); Removal: Remove the fixed end of the sliding structure (52) mounted on the flange.

9. The construction method for offshore installation of a platform within a wind turbine foundation according to claim 8, characterized in that: The prefabrication step comprises: The flange is welded to the top of the fan foundation (1); The guide mechanism (5) composed of the first slide groove structure (51) and the second slide groove structure (53) is pre-installed on the top of the flange; The connecting piece (4) is welded to the outer edge of the inner platform (3), and the sliding end of the sliding structure (52) is mounted on the connecting piece (4).

10. The construction method for offshore installation of a platform within a wind turbine foundation according to claim 8, characterized in that: The hoisting steps include: Using a construction vessel, installing a wind turbine foundation (1) with a flange (2) in the sea; The guide mechanism (5) is hoisted on the construction vessel and moved to the flange (2), and the wind rope is controlled to adjust the position of each positioning structure (54), thereby completing the installation of the positioning structure (54) and the flange (2); The inner platform (3) is hoisted on the construction vessel, and the guy rope is controlled so that the sliding structure (52) can slide smoothly into the sliding groove through the opening (511).

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