Construction system and construction method for wind turbine tower, and wind turbine tower

Abstract

A construction system for a wind turbine tower, comprising: a plurality of lifting / lowering devices (2), wherein each lifting / lowering device comprises one lifting / lowering rod (21) capable of extending and retracting in the vertical direction, and the lifting / lowering rods of the plurality of lifting / lowering devices can extend and retract synchronously; a lifting / lowering platform (3), which is horizontally supported on the lifting / lowering rods and ascends and descends along with the extension and retraction movement of the lifting / lowering rods, wherein the size of the lifting / lowering platform is smaller than the inner diameter of a currently installed tower section (10), such that the currently installed tower section can cover the lifting / lowering platform; and a plurality of horizontal extending / retracting devices (4), which are supported by the lifting / lowering platform and ascend and descend with the lifting / lowering platform synchronously, wherein each horizontal extending / retracting device comprises an extending / retracting rod (41) capable of extending and retracting in the horizontal direction, and end portions of the extending / retracting rods can extend out of the peripheral edge of the lifting / lowering platform and can be inserted into recesses (11) reserved in the inner wall of the tower section, so as to drive the tower section to ascend and descend synchronously with the lifting / lowering platform. The construction system can realize section-by-section assembly of a wind turbine tower from top to bottom, thus helping to increase the height of wind turbine towers and reduce costs. A construction method for a wind turbine tower, and a wind turbine tower are further provided.

Description

Construction system, construction methods and wind turbine tower

[0001] This application claims priority to Chinese Patent Application No. 202410497341.8, filed on April 24, 2024, entitled “Construction System, Construction Method and Wind Turbine Tower”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application belongs to the field of wind turbine construction technology, and in particular relates to a construction system, construction method and wind turbine tower. Background Technology

[0003] With the advancement of sustainable development, the global annual growth rate of renewable energy utilization has reached 25% in recent years. Among them, wind power generation is the most technologically mature renewable energy source besides hydropower, and it is receiving increasing attention and promotion worldwide. Wind power generation mainly utilizes wind turbine generators to convert the kinetic energy of wind into electrical energy. A wind turbine generator consists of a wind rotor, a generator, and a wind turbine tower. The wind turbine tower mainly plays a supporting role in the wind turbine generator, supporting the wind rotor at the appropriate height for operation, thereby obtaining sufficient wind power to drive the generator to generate electricity.

[0004] Traditional wind turbine tower construction methods typically involve hoisting the entire wind turbine generator set to its designated location for installation. Existing wind turbine towers are typically 110-180 meters tall with rotor diameters approaching 250 meters, requiring specialized large cranes for installation in a single operation. As the height of the wind turbine generator sets increases further, the installation height also increases, necessitating the manufacture of specialized cranes, which are extremely expensive, costing tens of millions of yuan per crane. Furthermore, the relocation and dismantling of such large cranes requires nearly a week each time, further increasing costs and time constraints.

[0005] For wind power generation, the higher the altitude, the greater the wind pressure and the better the wind energy resources. However, due to the aforementioned installation issues, the further increase in the height of existing wind turbines is significantly limited. In particular, when the height of wind turbine towers exceeds 150 meters, the lack of suitable cranes for installation greatly restricts the widespread application of high-power wind turbines.

[0006] Summary of the Invention

[0007] To address at least one shortcoming of the existing technology, this application provides a construction system, construction method and wind turbine tower for wind turbine towers, enabling the assembly of wind turbine towers section by section from top to bottom without the need for a special crane, thus freeing the height of the wind turbine tower from crane limitations and reducing costs.

[0008] The first aspect of this application provides a construction system for a wind turbine tower, wherein the wind turbine tower is assembled from multiple sections from top to bottom, and the construction system includes:

[0009] Multiple lifting devices are installed on the base of the wind turbine tower. Each lifting device includes a vertically retractable lifting rod, and the lifting rods of multiple lifting devices can extend and retract synchronously.

[0010] The lifting platform is horizontally supported on the lifting rod to move up and down with the extension and retraction of the lifting rod. The size of the lifting platform is smaller than the inner diameter of the currently installed cylinder section so that the currently installed cylinder section can be covered by the lifting platform.

[0011] Multiple horizontal telescopic devices are supported by a lifting platform and move up and down synchronously with the lifting platform. Each horizontal telescopic device includes a telescopic rod that can extend and retract in the horizontal direction. The end of the telescopic rod can extend out of the outer periphery of the lifting platform and insert into a pre-reserved groove on the inner wall of the cylinder section, so as to drive the cylinder section to move up and down synchronously with the lifting platform.

[0012] In some embodiments of the first aspect, the wind turbine tower includes n vertical sections with different inner diameters from top to bottom, as well as transition sections connecting the vertical sections with different inner diameters. The vertical sections and transition sections are assembled sequentially in order of increasing inner diameter to form the wind turbine tower. The lifting platform includes multiple units that can be spliced ​​sequentially from the center outward according to the construction progress, namely the first unit, the second unit, ..., the nth unit. The outer diameter of the lifting platform can be changed by splicing the units. The n units correspond sequentially to the n vertical sections with different inner diameters, and the outer diameter of the lifting platform after splicing each unit is smaller than the inner diameter of the corresponding vertical section and larger than the inner diameter of the vertical section of the previous specification.

[0013] In some embodiments of the first aspect, each unit of the lifting platform is annular, and each unit is formed by splicing two or more sector-shaped annular segments in the circumferential direction. The central angles of the sector-shaped annular segments in the same radial direction of the lifting platform are equal so that they are spliced ​​together in the radial direction. The horizontal telescopic device includes a drive device for driving the telescopic rod to perform telescopic movement. The drive device is located in the sector-shaped annular segment of the first unit and the telescopic path of the telescopic rod is located in the radial direction of the lifting platform.

[0014] In some embodiments of the first aspect, each sector-shaped annular segment includes a base plate and four side plates located on the base plate, forming a receiving cavity between the base plate and the four side plates. A cover plate is provided on the top of the four side plates, which can close the receiving cavity. The side plates located on the telescopic path of the telescopic rod are provided with corresponding through holes. A telescopic channel for the telescopic rod to perform telescopic movement is formed in one or more receiving cavities in the same radial direction. The telescopic rod can extend out of the lifting platform through the telescopic channel.

[0015] In some embodiments of the first aspect, the number of lifting devices is the same as the number of sector segments on the same circumference, and each sector segment on the outer circumference is supported by one lifting device.

[0016] In some embodiments of the first aspect, the lifting device is a hydraulic jack, which includes a hydraulic cylinder and a lifting rod that is retractable relative to the top of the hydraulic cylinder.

[0017] In some embodiments of the first aspect, the construction system further includes an external limiting system, which includes multiple support frames erected on the installation foundation of the wind turbine tower and a limiting ring fitted around the outer periphery of the wind turbine tower. The limiting ring is supported by the support frames and has multiple rollers arranged circumferentially on it. The rolling surfaces of the rollers are located on the inner surface of the limiting ring and contact the outer surface of the wind turbine tower. The multiple rollers cooperate with each other to limit the horizontal displacement of the wind turbine tower. The limiting ring is spliced ​​from multiple parts so that the inner diameter of the limiting ring can be varied to adapt to changes in the outer diameter of the tower section.

[0018] The second aspect of this application provides a method for constructing a wind turbine tower, which utilizes the wind turbine tower construction system described in any of the first aspects above. This construction method includes at least the following steps:

[0019] A construction system for wind turbine towers is established on the foundation of the wind turbine tower installation.

[0020] Top tower construction: The top tower located at the top of the wind turbine tower is hoisted onto the installation foundation. A groove is reserved on the inner wall of the top tower. The size of the lifting platform is smaller than the inner diameter of the top tower at the groove. The top tower is placed outside the lifting platform, and the groove reserved on the inner wall of the top tower is aligned with the extension path of the extension rod of the horizontal telescopic device. All extension rods are controlled to extend and insert into the groove on the inner wall of the top tower.

[0021] Tower lifting: Control all lifting booms to extend synchronously so that the lifting platform is raised. The lifting platform drives the installed part of the wind turbine tower to rise synchronously, so that the bottom of the installed part of the wind turbine tower is raised to a height greater than one section.

[0022] Cylindrical section hoisting: Hoist the next cylindrical section onto the installation foundation and place it directly below the installed part of the already lifted wind turbine tower. The next cylindrical section will be installed as the current cylindrical section in subsequent steps.

[0023] Tower descent: Control all lifting booms to retract synchronously so that the lifting platform descends, and the installed part of the wind turbine tower falls to the top of the currently installed section;

[0024] Cylindrical section connection: Connecting the existing section of the wind turbine tower to the currently installed cylindrical section;

[0025] Lifting object conversion: Control all telescopic rods on the lifting platform to retract and control all lifting rods to continue retracting, so that the lifting platform descends into the interior of the currently installed cylinder section and the extension path of the telescopic rods is aligned with the groove reserved on the inner wall of the currently installed cylinder section;

[0026] Control all telescopic rods on the lifting platforms to extend and insert into the grooves on the inner wall of the currently installed cylinder section;

[0027] Repeat the tower jacking steps and subsequent steps to install the next section in sequence. After the last section is connected, dismantle the construction system.

[0028] In some embodiments of the second aspect, the wind turbine tower includes a top steel tower and a plurality of precast concrete sections located below the top steel tower. The top tower includes a top steel tower and a first precast concrete section located below the top steel tower, with a groove reserved on the inner wall of the first precast concrete section. The construction steps of the top tower also include: firstly, installing the first precast concrete section on the installation foundation, then hoisting the top steel tower onto the first precast concrete section to form the top tower, installing the wind turbine onto the top steel tower, and installing the wind turbine blades onto the wind turbine.

[0029] In some embodiments of the second aspect, the sections of the wind turbine tower are all precast concrete sections, and the top tower is the first precast concrete section located at the top, with a groove reserved on the inner wall of the first precast concrete section; the construction steps of the top tower also include: hoisting the first precast concrete section onto the installation foundation, installing the wind turbine onto the first precast concrete section, and installing the wind turbine blades onto the wind turbine.

[0030] In some embodiments of the second aspect, the wind turbine tower comprises n vertical sections with different inner diameters from top to bottom, and transition sections connecting the vertical sections with different inner diameters. The lifting platform includes a first unit, a second unit, ..., an nth unit that can be sequentially assembled from the center outwards according to the construction progress. Each of the n units corresponds sequentially to a vertical section with one of the n inner diameters, and the outer diameter of the lifting platform after each unit assembly is smaller than the inner diameter of the corresponding vertical section but larger than the inner diameter of the vertical section with the previous inner diameter. At the beginning of construction, the lifting platform only includes the first unit corresponding to the first type of vertical section with the first inner diameter of the wind turbine tower; in the next type of vertical section... When the first cylindrical section of the next specification or when the transition cylindrical section is the current installation cylindrical section, the construction method after the jacking object conversion step also includes: the step of expanding the diameter of the lifting platform. Specifically: the unit of the lifting platform corresponding to the inner diameter of the next specification is spliced ​​to the outer periphery of the current lifting platform. The outer diameter of the spliced ​​lifting platform is expanded but smaller than the inner diameter of the vertical cylindrical section of the next specification. Each lifting device is moved outward to support the unit located on the outermost side of the lifting platform. The telescopic rod is controlled to extend and be inserted into the groove reserved on the inner wall of the first cylindrical section or transition cylindrical section of the next specification. Then the tower jacking step of installing the next cylindrical section is carried out.

[0031] In some embodiments of the second aspect, the cylindrical sections located below the top tower are all precast concrete cylindrical sections. Each precast concrete cylindrical section is formed by splicing two or more tower tube segments in the circumferential direction. The two end faces of each tower tube segment are a first end face and a second end face, respectively. The portion of the first end face near the outer side extends to form a first extension that matches the curvature of the tower tube segment. The portion of the second end face near the inner side extends to form a second extension that matches the curvature of the tower tube segment. The tower tube segments constituting a cylindrical section are spliced ​​sequentially. The first extension of one tower tube segment is spliced ​​with the second extension of the adjacent tower tube segment to form a cavity at the splicing position.

[0032] In some embodiments of the second aspect, transverse reinforcing bars with the same curvature as the tower tube segment are built into the tower tube segment. Each transverse reinforcing bar includes a first arc-shaped segment near the outer surface of the tower tube segment, a second arc-shaped segment near the inner surface of the tower tube segment, and two connecting segments. One end of the first arc-shaped segment extends into a first extension, and the other end of the first arc-shaped segment protrudes from a second end face. One end of the second arc-shaped segment extends into a second extension, and the other end of the second arc-shaped segment protrudes from the first end face. The two connecting segments connect the first arc-shaped segment and the second arc-shaped segment at their respective ends. To close the transverse reinforcement; in the section hoisting step, the tower tube segments that make up the next section are hoisted onto the installation foundation for splicing. After the tower tube segments are spliced, a cavity is formed at the joint of two adjacent tower tube segments, and transverse reinforcement extending from the tower tube segments is contained in the cavity. The transverse reinforcement extending into the cavity from two adjacent tower tube segments is arranged in a staggered manner in the longitudinal direction; in the section connection step, concrete or grout is poured into the cavity to solidify and connect each tower tube segment and the transverse reinforcement inside through concrete or grout, thus completing the connection of the sections.

[0033] In some embodiments of the second aspect, a grouting sleeve is built into the bottom of each tower segment. The grouting sleeve has a grouting cavity inside, and the bottom of the grouting sleeve is open and communicates with the grouting cavity. The grouting sleeve is provided with an injection hole and a grout outlet hole that communicate with the grouting cavity and the outside. The bottom end of the longitudinal steel bar built into the tower segment is connected to the grouting sleeve, and the top end extends out from the top of the tower segment. In the tower lowering step, when the installed part of the wind turbine tower falls to the top of the currently installed segment, the longitudinal steel bar extending out from the top of the currently installed segment extends into the grouting sleeve built into the bottom of the previous segment. In the segment connection step, grout is injected into the grouting sleeve through the injection hole, and the grout outlet hole is observed to achieve a solid connection between the upper and lower segments.

[0034] In some embodiments of the second aspect, the grouting sleeve is a semi-grouting sleeve. The bottom end of the longitudinal steel bar inside the tower segment is connected to the upper part of the grouting sleeve in a non-grouting manner. The bottom surface of the tower segment is concave upward and, after falling, together with the upper surface of the next segment, forms a grout flow channel. The grout flow channel is connected to the opening at the bottom of each grouting sleeve to allow grout to flow. The grout outlet is located above the injection hole. In the segment connection step, one injection hole is retained, and the other injection holes are blocked. Grouting is performed through the retained injection hole. The grout discharge of each outlet hole is observed. The outlet holes that have discharged grout are blocked. When all outlet holes discharge grout and are blocked, the grouting is completed.

[0035] In some embodiments of the second aspect, a corrugated sleeve is built into the lower part of each tower segment, and a connecting steel bar located in the same vertical direction as the corrugated sleeve is built into the top of each tower segment. The connecting steel bar extends from the top of the tower segment. The corrugated sleeve is hollow inside and has a grouting port at the top that communicates with the outside. The bottom of the corrugated sleeve is open to allow the connecting steel bar at the top of the next segment to be inserted therein. The side surface of the corrugated sleeve is corrugated. During the tower lowering step, when the installed part of the wind turbine tower falls to the top of the currently installed segment, the connecting steel bar extending from the top of the currently installed segment is inserted into the corrugated sleeve at the bottom of the previous segment. During the segment connection step, grout is injected into the corrugated sleeve through the grouting port to achieve a solid connection between the upper and lower segments.

[0036] In some embodiments of the second aspect, during the construction of the wind turbine tower and / or after all sections are installed, a rope restraint step is also included. Specifically, the top of a prestressed rope is connected to the top of the tower, and the bottom of the rope is connected to the installation foundation. Multiple ropes are provided and distributed along the inner circumference of the wind turbine tower. If strong winds occur during construction, the prestressed ropes are tightened to restrain the installed parts of the wind turbine tower. After all sections are installed, the prestressed ropes are tightened to restrain the displacement of the wind turbine tower.

[0037] The third aspect of this application provides a wind turbine tower assembled according to the construction method described in any one of the second aspects.

[0038] Compared with the prior art, the advantages and positive effects of this application are as follows:

[0039] (1) The wind turbine tower construction system provided in at least one embodiment of this application can realize the assembly of the entire wind turbine tower section by section from top to bottom through the cooperation of the lifting device, the lifting platform and the horizontal telescopic device. Compared with the prior art, there is no need to customize a special large crane for overall hoisting, which greatly reduces the construction cost, avoids the time and cycle of site transfer, and improves the construction efficiency. In addition, the height of the wind turbine tower assembled by the construction system is no longer limited by the hoisting equipment, which is conducive to increasing the height of the wind turbine tower and realizing the utilization of upper wind energy resources.

[0040] (2) The construction method of the wind turbine tower provided in at least one embodiment of this application is carried out by means of the construction system provided in this application. The sections constituting the wind turbine tower are assembled from top to bottom. During the installation process, the wind turbine tower is lifted and lowered by a lifting platform, so that the assembly of the sections no longer requires high-altitude operations. The height of the crane and the construction operation are no longer a limitation on the height of the wind turbine tower, which is conducive to promoting the further development of the wind power generation industry and reducing construction costs.

[0041] (3) The wind turbine tower provided in at least one embodiment of this application is assembled by the construction system and construction method provided in this application. Compared with the wind turbine tower in the prior art, it can have a higher height and a larger installed capacity, which is conducive to developing upper wind energy resources and improving wind energy utilization. Attached Figure Description

[0042] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0043] Figure 1a is a perspective view of a construction system in one embodiment of this application;

[0044] Figure 1b is a front view of the construction system in one embodiment of this application;

[0045] Figure 1c is a top view of a construction system in one embodiment of this application;

[0046] Figure 2a is a perspective view of a construction system with the lifting rod in the extended state according to an embodiment of this application;

[0047] Figure 2b is a front view of a construction system with the lifting rod in the extended state according to an embodiment of this application;

[0048] Figure 3a is a schematic diagram of a telescopic pole in a construction system according to an embodiment of this application;

[0049] Figure 3b is a schematic diagram of a telescopic rod in a construction system according to an embodiment of this application;

[0050] Figure 4a is a schematic diagram of the sector-shaped annular segment constituting the lifting platform in one embodiment of this application;

[0051] Figure 4b is a schematic diagram of the open state of the cover plate of the sector-shaped annular segment in one embodiment of this application;

[0052] Figure 5a is a schematic diagram of the docking of sector-shaped annular segments on the same radial direction in one embodiment of this application;

[0053] Figure 5b is a schematic diagram of the cover plate in the open state in Figure 5a;

[0054] Figure 6 is a schematic diagram of the peripheral limiting system in a construction system according to an embodiment of this application;

[0055] Figure 7 is a partial longitudinal sectional view of the mating position of the roller and the cylinder section in one embodiment of this application;

[0056] Figure 8 is a schematic diagram of the peripheral limiting system and pull rope in a construction system according to an embodiment of this application;

[0057] Figure 9 is a front view of a wind turbine tower assembled according to a construction method in one embodiment of this application;

[0058] Figure 10a is a schematic diagram of a cylindrical section in one embodiment of this application;

[0059] Figure 10b is a transverse sectional view of a cylindrical section in one embodiment of this application;

[0060] Figure 10c is a magnified view of part A in Figure 10b;

[0061] Figure 11 is an exploded view of a section of the cylinder in another embodiment of this application;

[0062] Figure 12 is a schematic diagram of a tower tube segment in one embodiment of this application;

[0063] Figure 13 is a top view of the transverse reinforcing bars in one embodiment of this application;

[0064] Figure 14 is a partial longitudinal sectional view of the cylindrical section connection portion in one embodiment of this application;

[0065] Figure 15 is a schematic diagram of a grouting sleeve in one embodiment of this application;

[0066] Figure 16 is a schematic diagram of a tower tube segment in another embodiment of this application;

[0067] Figure 17 is a partial longitudinal sectional view of a section of the cylinder in another embodiment of this application;

[0068] Figure 18 is a schematic diagram of a bellows sleeve in one embodiment of this application;

[0069] Figure 19 is a flowchart of a construction method for a wind turbine tower provided in one embodiment of this application. Detailed Implementation

[0070] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0071] Obviously, the accompanying drawings described below are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios based on these drawings without any inventive effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, any changes to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0072] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0073] In the description of this application, it should be understood that the terms "center", "lateral", "longitudinal", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0074] The terms "first," "second," "third," ..., "nth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. The term "multiple" as used in this application includes two or more.

[0075] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0076] An embodiment of the first aspect of this application provides a construction system for a wind turbine tower. As shown in FIG9, the wind turbine tower 1 assembled by the construction system provided in this embodiment is composed of multiple sections 10 assembled from top to bottom.

[0077] As shown in Figures 1a-2b, the construction system of this wind turbine tower includes multiple lifting devices 2, a lifting platform 3, and multiple horizontal telescopic devices 4.

[0078] Multiple lifting devices 2 are installed on the mounting foundation 7 of the wind turbine tower 1. Each lifting device 2 includes a vertically extendable lifting rod 21, and the lifting rods 21 of these lifting devices 2 can extend and retract synchronously.

[0079] The lifting platform 3 is horizontally supported on the lifting rod 21 of the lifting device 2, so that it can be raised and lowered with the extension and retraction of the lifting rod 21. The size of the lifting platform 3 is smaller than the inner diameter of the currently installed cylindrical section 10, so that the currently installed cylindrical section 10 can be covered by the lifting platform 3. It can be understood that the top of the lifting rod 21 of the lifting device 2 is located on the same horizontal plane, so that the lifting platform 3 remains horizontal.

[0080] Referring further to Figures 3a and 3b, multiple horizontal telescopic devices 4 are supported by the lifting platform 3. For example, they can be installed on or inside the lifting platform 3, as long as they can rise and fall synchronously with the lifting platform 3.

[0081] A groove 11 is pre-drilled circumferentially on the inner wall of the cylindrical section 10 of the wind turbine tower 1. The horizontal telescopic device 4 includes a telescopic rod 41 that can extend and retract horizontally. The end of the telescopic rod 41 can extend out of the outer peripheral edge of the lifting platform 3 and insert into the groove 11 on the inner wall of the currently installed cylindrical section 10. Thus, the lifting platform 3 and the horizontal telescopic device 4 rise and fall synchronously under the telescopic movement of the lifting rod 21. At the same time, because the telescopic rod 41 of the horizontal telescopic device 4 is engaged in the groove 11 on the inner wall of the currently installed cylindrical section 10, the currently installed cylindrical section 10 rises and falls synchronously with the lifting platform 3.

[0082] The wind turbine tower construction system provided in the above embodiments of this application cleverly transmits vertical lifting motion to the tower section 10 through the design of the lifting device 2 in conjunction with the lifting platform 3 and the horizontal telescopic device 4. The tower section 10 is lifted by controlling the synchronous extension and retraction of the lifting rod 21 of the lifting device 2, and the current installation section 10 can be switched by controlling the horizontal extension and retraction of the telescopic rod 41 in the horizontal telescopic device 4. Thus, the entire wind turbine tower 1 can be assembled section by section from top to bottom. Compared with existing technologies, there is no need to customize a special large crane for overall hoisting, greatly reducing construction costs, avoiding relocation time and cycle, and improving construction efficiency. At the same time, since the wind turbine tower is assembled section by section from top to bottom, the assembly of the tower sections does not require high-altitude operations, so the height of the wind turbine tower is no longer limited by the hoisting equipment, which is conducive to increasing the height of the wind turbine tower and making fuller use of wind energy.

[0083] In some embodiments, the lifting device 2 is a hydraulic jack, which includes a hydraulic cylinder 22 and a lifting rod 21 that is retractable relative to the top of the hydraulic cylinder 22. The lifting rods 21 of all hydraulic jacks can be raised and lowered synchronously, ensuring that the lifting platform 3 remains horizontal or nearly horizontal during the lifting process, thus improving the accuracy of the vertical connection of the tower sections. Hydraulic jacks provide powerful lifting force and excellent controllability, making them ideal for use in the construction of wind turbine towers, ensuring the stability and safety of the construction process.

[0084] In some embodiments, the horizontal telescopic device 4 includes a drive device 42 for driving the telescopic rod 41 to perform telescopic movements. The drive device 42 may be a hydraulic cylinder or other device that can provide driving force, and this application does not impose any limitations. The structure of the telescopic rod 41 of the horizontal telescopic device 4 can be designed as needed. During the design process, those skilled in the art can determine the structural parameters of the telescopic rod 41 by performing load-bearing calculations based on the weight of the wind turbine tower. This part belongs to the prior art and will not be described in detail in this application.

[0085] Typically, the diameter of the wind turbine tower 1 increases from top to bottom, resulting in a more stable structure. In this case, as shown in Figure 9, the wind turbine tower 1 comprises n vertical sections 101 with different inner diameters from top to bottom, and transition sections 102 connecting the vertical sections 101 with different inner diameters. The vertical sections 101 and transition sections 102 are assembled sequentially in ascending order of inner diameter to form the wind turbine tower 1. Here, n is a positive integer, and the value of n is related to the designer's design and the height of the wind turbine tower 1.

[0086] To address the aforementioned situation, the lifting platform 3 in the construction system includes multiple units 30 that can be sequentially assembled from the center outwards according to the construction progress. These units are, in order, the first unit 301, the second unit 302, the third unit 303, ..., the nth unit. The outer diameter of the lifting platform 3 can be changed by assembling the units 30. The n units 30 correspond sequentially to n vertical cylindrical sections 101 with different inner diameters. In this embodiment, the correspondence between the n units 30 and the n vertical cylindrical sections 101 with different inner diameters means that after each unit 30 is assembled, the outer diameter of the lifting platform 3 is smaller than the inner diameter of its corresponding vertical cylindrical section 101 but larger than the inner diameter of the vertical cylindrical section 101 of the previous specification.

[0087] The above embodiments take into account the differences in the inner diameter of the wind turbine tower. The design of the lifting platform 3, through its splicing mechanism, makes its size adjustable. This design ensures that the size of the lifting platform 3 is closer to that of the currently installed tower section 10, making the lifting process of the installed tower section 10 more stable, reducing the stress on the telescopic rod 41 of the horizontal telescopic device 4, and adapting to the installation requirements of tower sections of different sizes. In the above scheme, for the transition tower section 102, since its lower inner diameter is the same as the inner diameter of the vertical tower section 101 below it, the lifting platform 3, which is spliced ​​from the unit 30 corresponding to the vertical tower section 101 below it, can be directly used for installation.

[0088] In some embodiments, each unit 30 of the lifting platform 3 is annular, and each unit 30 is formed by splicing two or more sector-shaped annular segments 31 in the circumferential direction. The central angles of the sector-shaped annular segments 31 in the same radial direction of the lifting platform 3 are equal so that they are spliced ​​in the radial direction, as shown in Figures 3a and 3b. The driving device 42 of each horizontal telescopic device 4 is respectively provided in the sector-shaped annular segment 31 of the first unit 301 and the telescopic path of the telescopic rod 41 is located in the radial direction of the lifting platform 3.

[0089] During the use of the construction system, one or more units 30 are spliced ​​on the outer periphery of the first unit 301 of the lifting platform 3 as needed, according to the inner diameter of the currently installed cylinder section. When it is necessary to lift the cylinder section 10, the telescopic rod 41 of the horizontal telescopic device 4 extends radially outward from the lifting platform 3 and is inserted into the groove 11 on the inner wall of the cylinder section 10.

[0090] By adopting the design of annular unit 30 and sector-shaped annular segment 31, not only is the stability and reliability of the lifting platform 3 increased, but the splicing and adjustment of the platform also become more convenient and flexible. This design allows the construction system to adapt to the installation of cylinder sections of different sizes, further improving the system's applicability and construction efficiency.

[0091] In the embodiments of this application, the number and position of the horizontal telescopic devices 4 can be designed as needed. For example, the positions of each horizontal telescopic device 4 can be centrally symmetrically distributed so that the force on the construction system is more uniform and the construction process is more reliable.

[0092] In some embodiments, as shown in Figures 4a-5b, each sector-shaped annular segment 31 includes a base plate 311 and four side plates 312 located on the base plate 311. A receiving cavity 313 is formed between the base plate 311 and the four side plates 312. A cover plate 314 is provided on the top of the four side plates 312, which can close the receiving cavity 313. The side plates 312 located on the telescopic path of the telescopic rod 41 of the horizontal telescopic device 4 are respectively provided with through holes 315. A telescopic channel 32 is formed in one or more receiving cavities 313 in the same radial direction for the telescopic rod 41 of the horizontal telescopic device 4 to perform telescopic movement. The telescopic rod 41 of the horizontal telescopic device 4 can extend out of the lifting platform 3 through the telescopic channel 32.

[0093] The above embodiment provides a specific implementation of the fan-shaped annular segment 31. The design of the receiving cavity 313 of the fan-shaped annular segment 31 provides space for the extension and retraction movement of the drive device 42 and the telescopic rod 41 of the horizontal telescopic device 4. The drive device 42 of the horizontal telescopic device 4 is set in the receiving cavity 313 of the fan-shaped annular segment 31 of the innermost first unit 301. The telescopic rod 41 of the horizontal telescopic device 4 can extend outward or retract inward through the through hole 315 on its extension and retraction path. This design not only provides space for the horizontal telescopic device 4, but also protects the horizontal telescopic device 4 from damage by external forces during construction. When it is necessary to change the position of the horizontal telescopic device 4 or to repair the horizontal telescopic device 4, the top cover plate 314 can be opened to expose the horizontal telescopic device 4 for corresponding operations.

[0094] It is understood that the above embodiments only provide possible implementations of the lifting platform 3 and its horizontal telescopic device 4. Those skilled in the art can use other methods to achieve the corresponding functions, and this application does not impose any limitations. The connection between adjacent sector-shaped annular segments 31 can be achieved using any feasible solution in the prior art, such as fastening with bolts.

[0095] In some embodiments, the number of lifting devices 2 is the same as the number of sector-shaped annular segments 31 on the same circumference, and each sector-shaped annular segment 31 on the outer circumference is supported by one lifting device 2. That is, as shown in Figures 1a-2b, the lifting devices 2 are supported below the outermost sector-shaped annular segments 31 of the lifting platform 3, and each sector-shaped annular segment 31 on the outermost circumference is supported by one lifting device 2. This design ensures the stability of the entire lifting platform 3, making the construction process safer and more reliable, and reducing stress concentration in the overall structure.

[0096] In some embodiments, the construction system for the wind turbine tower also includes an external limiting system 5, as shown in Figures 6-8. The external limiting system 5 includes multiple support frames 51 erected on the installation foundation 7 of the wind turbine tower 1 and a limiting ring 52 fitted around the outer periphery of the wind turbine tower 1. The limiting ring 52 is supported by the support frames 51. Multiple rollers 53 are provided on the circumferential direction of the limiting ring 52. The rolling surface of the rollers 53 is located on the inner surface side of the limiting ring 52 and contacts the outer surface of the wind turbine tower 1. The multiple rollers 53 cooperate with each other to limit the horizontal displacement of the wind turbine tower 1. The limiting ring 52 is spliced ​​together from multiple ring segments 521, so that the inner diameter of the limiting ring 52 can be varied to adapt to the change of the outer diameter of the cylinder section 10.

[0097] In the above scheme, the peripheral limiting system 5 provides a limiting function for the wind turbine tower during construction. During the lifting and lowering process, the peripheral limiting system 5 can provide an effective horizontal limiting function, so that the wind turbine tower can always remain in the vertical direction during the lifting and lowering process, preventing the wind turbine tower from tilting or horizontally displacing, thereby improving installation accuracy and construction efficiency.

[0098] In the above scheme, the number of support frames 51 is not limited, and typically four or more are evenly spaced below the limiting ring 52 to support it. For example, in the embodiment shown in Figure 6, the support frame 51 includes a vertical support rod 511 and a horizontal support rod 512 located at the top of the vertical support rod 511. The vertical support rod 511 is used to position the support height, and the horizontal support rod 512 is used to connect the limiting ring 52, thereby supporting the limiting ring 52 at the required height. The support frame 51 can also adopt other structures. This application does not limit the specific structure of the support frame 51, as long as it can support the limiting ring 52 at the required height.

[0099] In the embodiment shown in Figure 8, a reinforcing rope 54 is connected between the top of the vertical support rod 511 and the mounting base 7. The reinforcing rope 54 provides an outward pulling force to the top of the vertical support rod 511, which is opposite to the force of the limiting ring 52 on the support frame 51, forming a stable force structure and making the peripheral limiting system more stable.

[0100] In the embodiment shown in Figure 7, the limiting ring 52 is hollow inside, the wheel body of the roller 53 is located inside the limiting ring 52, and one side of the roller 53 is exposed from the inner surface of the limiting ring 52 and rolls in contact with the outer surface of the cylinder section 10.

[0101] The limiting ring 52 is composed of multiple ring segments 521 spliced ​​together. For example, the limiting ring 52 is composed of multiple ring segments 521 spliced ​​together circumferentially. By changing the number of spliced ​​ring segments 521, the inner diameter of the limiting ring 52 can be changed, thereby matching the size of the cylinder section 10 with different outer diameters. The roller 53 contacts the outer surface of the wind turbine tower 1 on the inner surface side of the limiting ring 52. During the lifting and lowering of the wind turbine tower 1, the roller 53 rolls with the outer surface of the wind turbine tower 1, without hindering the lifting and lowering movement of the wind turbine tower 1. In some embodiments, the structure of the ring segment 521 can refer to the structure of the fan-shaped circular segment 31 constituting the lifting platform 3, which is composed of a base plate, side plates, and a cover plate, and will not be described in detail here.

[0102] In some embodiments, the support height of the limiting ring 52 is higher than: the height of one section of the cylinder 10 + the length of the pre-reserved reinforcing bars on the outside of the cylinder 10 + twice the height of the limiting ring 52. Supporting the limiting ring 52 at the above-mentioned height ensures the smooth installation of the upper and lower cylinder sections 10 during construction, avoids the limiting ring 52 affecting the installation of the cylinder section 10, and eliminates the need for frequent readjustment of the position of the limiting ring 52, thereby improving construction efficiency.

[0103] An embodiment of the second aspect of this application provides a construction method for a wind turbine tower, which utilizes the wind turbine tower construction system described in any of the preceding claims. As shown in Figure 19, the construction method includes at least the following steps:

[0104] S1: The construction system for the wind turbine tower is set up on the installation foundation 7 of the wind turbine tower 1.

[0105] S2: Top tower construction: The top tower 103 located at the top of the wind turbine tower is hoisted onto the installation foundation 7. A groove 11 is reserved on the inner wall of the top tower 103. The height of the top tower 103 meets the installation height of the wind turbine blades 82. The size of the lifting platform 3 in the construction system is smaller than the inner diameter of the top tower 103 at the groove 11. The top tower 103 is covered outside the lifting platform 3, and the groove 11 reserved on the inner wall of the top tower 103 is aligned with the extension path of the extension rod 41 of the horizontal extension device 4. All extension rods 41 are controlled to extend and insert into the groove 11 on the inner wall of the top tower 103.

[0106] S3: Tower Lifting: Control all lifting booms 21 to extend synchronously so that the lifting platform 3 is raised. The lifting platform 3 drives the installed part of the wind turbine tower to rise synchronously, so that the bottom of the installed part of the wind turbine tower is raised to a height greater than that of one section 10. The height here needs to take into account the length of the exposed steel bars of the section 10 and the necessary construction height.

[0107] S4: Cylindrical section hoisting: Hoist the next cylindrical section 10 onto the installation foundation 7 and place it directly below the installed part of the wind turbine tower that has been lifted. The next cylindrical section 10 will be installed as the current installed cylindrical section 10 in subsequent steps.

[0108] S5: Tower descent: Control all lifting booms 21 to retract synchronously so that the lifting platform 3 descends, and the installed part of the wind turbine tower falls to the top of the currently installed section 10;

[0109] S6: Cylindrical section connection: Connect the installed part of the wind turbine tower to the currently installed cylindrical section 10;

[0110] S7: Lifting Object Conversion: Control all telescopic rods 41 on the lifting platform 3 to retract and control all lifting rods 21 to continue retracting, so that the lifting platform 3 descends into the interior of the currently installed cylinder section 10 and the telescopic path of the telescopic rods 41 is aligned with the groove 11 reserved on the inner wall of the currently installed cylinder section 10.

[0111] S8: Control all horizontal telescopic devices 4 to extend and insert the telescopic rods 41 into the grooves 11 on the inner wall of the currently installed cylindrical section 10;

[0112] Repeat steps S3-S8 above to install subsequent cylinder sections 10 in sequence. After the last cylinder section 10 has completed the cylinder section connection steps, remove the construction system.

[0113] The construction method for the wind turbine tower in the above scheme utilizes the construction system of any embodiment of the first aspect. It abandons the traditional method of using a dedicated crane for overall hoisting, and instead installs the tower sections 10 constituting the wind turbine tower 1 section by section from top to bottom. During installation, the wind turbine tower 1 is raised and lowered using a lifting platform 3, eliminating the need for high-altitude operations during the assembly of the sections 10. The height of the crane and construction work is no longer a limitation on the height of the wind turbine tower 1. The wind turbine tower 1 assembled using the above construction method can have a height far exceeding that of existing wind turbine towers 1, making fuller use of wind energy and promoting the application of the wind power generation industry.

[0114] It is understood that only the steps related to the improvement of this application are shown in the above method, not all of the steps. Therefore, the steps are not seamlessly connected, and other necessary steps may be interspersed between the two steps as needed.

[0115] In some embodiments, the wind turbine tower 1 includes a top steel tower 105 and a plurality of precast concrete sections 104 located below the top steel tower 105. In this case, the top tower 103 includes the top steel tower 105 and a first precast concrete section 1041 located below the top steel tower 105, with a groove 11 pre-reserved on the inner wall of the first precast concrete section 1041. Accordingly, the construction steps of the top tower also include: firstly, installing the first precast concrete section 1041 on the installation foundation 7; then, hoisting the top steel tower 105 onto the first precast concrete section 1041 to form the top tower 103; installing the wind turbine 81 onto the top steel tower 105; and installing the wind turbine blades 82 onto the wind turbine 81.

[0116] In some embodiments, the sections 10 of the wind turbine tower 1 are all precast concrete sections 104. In this case, the top tower 103 is the first precast concrete section 1041 located at the top, and a groove 11 is reserved on the inner wall of the first precast concrete section 1041. Accordingly, the construction steps of the top tower also include: hoisting the first precast concrete section 1041 onto the installation foundation, installing the wind turbine 81 onto the first precast concrete section 1041, and installing the wind turbine blades 82 onto the wind turbine 81. In this case, it is understood that the height of the first precast concrete section 1041 may be different from that of the other precast concrete sections below, and it needs to meet the height requirements for the installation of the wind turbine blades 82.

[0117] Since wind turbine tower 1 typically has a structure that is narrower at the top and wider at the bottom, in this case, wind turbine tower 1 comprises, from top to bottom, n vertical cylindrical sections 101 with different inner diameters and transition cylindrical sections 102 connecting the vertical cylindrical sections 101 with different inner diameters. The vertical cylindrical sections 101 and transition cylindrical sections 102 are assembled sequentially in order of increasing inner diameter to form wind turbine tower 1. Here, n is a positive integer, and the value of n is related to the designer's design and the height of wind turbine tower 1. It should be noted that the vertical cylindrical section 101 described here is a section with a vertical side surface, and its inner diameter is equal from top to bottom; the transition cylindrical section 102 is a section connecting two inner diameters, with its top dimension being the same as the upper section and its bottom dimension being the same as the lower section, therefore, its inner diameter varies. In the description of this application, the vertical cylinder 101 and the transition cylinder 102 are generally the aforementioned precast concrete cylinder 104 without including the top steel tower 105, which is connected to the first precast concrete cylinder 1041 below it and is raised and lowered together with the first precast concrete cylinder 1041.

[0118] In this case, the lifting platform 3 in the construction system includes a first unit 301, a second unit 302, ..., an nth unit 30 that can be sequentially spliced ​​from the center outward according to the construction progress. The n units 30 correspond to the n vertical cylinder sections 101 with different inner diameters. The outer diameter of the lifting platform 3 after splicing each unit 30 is smaller than the inner diameter of the corresponding vertical cylinder section 101 and larger than the inner diameter of the vertical cylinder section 101 with the previous specification. At the beginning of construction, the lifting platform 3 only includes the first unit 301 corresponding to the vertical cylinder section 101 with the first inner diameter of the wind turbine tower 1.

[0119] When the first cylindrical section 10 of the next specification inner diameter or when the transition cylindrical section 102 is the currently installed cylindrical section 10, the construction method after the S7 lifting object conversion step also includes: the S71 lifting platform diameter expansion step, specifically: splicing the unit 30 of the lifting platform 3 corresponding to the next specification inner diameter to the outer periphery of the current lifting platform 3, the outer diameter of the spliced ​​lifting platform 3 is enlarged but smaller than the inner diameter of the vertical cylindrical section 101 of the next specification inner diameter, moving each lifting device 2 outward to support the unit 30 located on the outermost side of the lifting platform 3, controlling the extension rod 41 to extend and insert into the groove 11 reserved on the inner wall of the first cylindrical section 10 or the transition cylindrical section 102 of the next specification inner diameter, and then performing the S3 tower lifting step for the installation of the next cylindrical section 10.

[0120] In the above construction method, the lifting platform 3 has a size closer to the inner diameter of the currently installed cylinder section 10, making its lifting process for the installed cylinder section 10 more stable, reducing the stress on the telescopic rod 41 of the horizontal telescopic device 4, and adapting to the installation requirements of cylinder sections of different sizes. In the above scheme, for the transition cylinder section 102, since its lower inner diameter is the same as the inner diameter of the vertical cylinder section 101 below it, the lifting platform 3, which is spliced ​​with the unit 30 corresponding to the vertical cylinder section 101 below it, can be directly used for installation.

[0121] The sections below the top tower section 103 in the wind turbine tower are all precast concrete sections 14. In some embodiments, as shown in Figures 10a-13, each precast concrete section 14 is formed by splicing two or more tower segments 12 in the circumferential direction.

[0122] In some embodiments, the two end faces of each tower tube segment 12 are a first end face 121 and a second end face 122, respectively. The portion of the first end face 121 near the outer side extends to form a first extension 1201 that conforms to the curvature of the tower tube segment 12, and the portion of the second end face 122 near the inner side extends to form a second extension 1202 that conforms to the curvature of the tower tube segment 12. The tower tube segments 12 constituting a section 10 are sequentially spliced ​​together, and the first extension 1201 of one tower tube segment 12 is spliced ​​with the second extension 1202 of an adjacent tower tube segment 12 to form a cavity 14 at the splicing position. By improving the structure of the tower tube segment 12, a cavity 14 can be directly formed at the splicing position after adjacent tower tube segments 12 are joined, which is simple and efficient.

[0123] In some embodiments, a transverse steel bar 13 with the same curvature as the tower tube segment 12 is built into the tower tube segment 12, and the transverse steel bar 13 extends from the end faces on both sides of the tube segment 12; in order to achieve a more stable connection, the structure of the transverse steel bar 13 has also been improved. As shown in Figure 13, the transverse reinforcing bars 13 within each tower tube segment 12 include a first arc-shaped segment 131, a second arc-shaped segment 132, and two connecting segments 133 connecting the first arc-shaped segment 131 and the second arc-shaped segment 132. The first arc-shaped segment 131 is located near the outer surface of the tower tube segment 12, with one end extending into the first extension portion 1201 and the other end protruding through the second end face 122. The second arc-shaped segment 132 is located near the inner surface of the tower tube segment 12, with one end extending into the second extension portion 1202 and the other end protruding through the first end face 121. The two connecting segments 133 connect the first arc-shaped segment 131 and the second arc-shaped segment 132 at their respective ends, thereby enclosing the transverse reinforcing bars 13. When adjacent tower tube segments 12 are spliced, the connecting segments 133 are located within the cavity 14. The closed transverse reinforcing bars 13 have superior shear resistance. The ends of the transverse reinforcing bars 13 of adjacent tower tube segments 12 are fixed together within the cavity 14, improving the strength of the spliced ​​tube section 10 and the reliability of the splicing connection. Furthermore, since the first extension 1201 and the second extension 1202 have relatively thin thicknesses, they are prone to breakage at the connection point with the main body of the tower tube segment 12. The first arc-shaped segment 131 is located in the first extension 1201, and the second arc-shaped segment 132 is located in the second extension 1202, which can improve the strength between the first extension 1201 and the second extension 1202 and the main body of the tower tube segment 12.

[0124] In the S4 section hoisting step, the tower tube segment 12 that constitutes the next section is hoisted onto the installation foundation 7 for splicing. After the tower tube segment 12 is spliced, a cavity 14 is formed at the docking position of two adjacent tower tube segments 12, and a portion of the transverse steel bars 13 extending from the tower tube segment 12 are contained in the cavity 14. The transverse steel bars 13 extending into the cavity from two adjacent tower tube segments 12 are staggered in the longitudinal direction. Concrete or grout is poured into the cavity 14 to solidify and connect each tower tube segment 12 and the transverse steel bars 13 inside through concrete or grout, thus completing the connection of the section 10.

[0125] In the above scheme, a cavity 14 is formed at the joint of adjacent tower tube segments 12, and transverse reinforcing bars 13 extending from the inside of the tower tube segments 12 are arranged in the cavity 14. By pouring concrete or grout into the cavity 14, the adjacent tower tube segments 12 and the transverse reinforcing bars 13 are fixed into one piece. Although the cylinder section 10 is spliced ​​from precast tower tube segments 12 in this scheme, the cylinder section 10 spliced ​​by the above scheme is equivalent to cast-in-place molding. However, the construction method is simpler and more efficient than cast-in-place molding, which greatly reduces the construction process and cycle, and reduces the construction cost. In the embodiment shown in Figure 10a, a cylinder section 10 is spliced ​​from two tower tube segments 12 in the circumferential direction; in the embodiment shown in Figure 11, a cylinder section 10 is spliced ​​from four tower tube segments 12 in the circumferential direction; the number of tower tube segments 12 constituting a cylinder section 10 can be determined as needed.

[0126] In some embodiments, the upper and lower cylinder sections 10 are connected by grouting sleeves. The specific scheme is as follows.

[0127] As shown in Figures 14 and 15, a grouting sleeve 15 is built into the bottom of each tower tube segment 12. The grouting sleeve 15 has a grouting cavity 151 inside, and its bottom is open and communicates with the grouting cavity 151. The grouting sleeve 15 has an injection hole 152 and a grout outlet hole 153 connecting the grouting cavity 151 to the outside. The bottom end of the longitudinal reinforcing steel bar 17 built into the tower tube segment 12 is connected to the grouting sleeve 15, and its top end extends from the top of the tower tube segment 12. The grouting sleeve 15 achieves a stable connection between the upper and lower tube sections 10. The number and placement of the grouting sleeves can be determined as needed. For example, two rows of grouting sleeves 15 can be arranged near the inner and outer sides of the tower tube segment 12 respectively to achieve a more stable connection.

[0128] Based on the above scheme, in the S5 tower lowering step, when the installed part of the wind turbine tower 1 falls to the top of the currently installed cylinder section 10, the longitudinal steel bar 17 extending from the top of the currently installed cylinder section 10 extends into the grouting sleeve 15 built into the bottom of the previous cylinder section 10; in the S6 cylinder section connection step, grout is injected into the grouting sleeve 15 through the grouting hole 152, and the grout discharge situation of the grout outlet hole 153 is observed to achieve the consolidation connection between the upper and lower cylinder sections 10.

[0129] Furthermore, the grouting sleeve 15 is a semi-grouting sleeve. The bottom end of the longitudinal steel bar 17 built into the tower tube segment 12 is connected to the upper part of the grouting sleeve 15 in a non-grouting manner (e.g., threaded connection). The bottom surface of the tower tube segment 12 is concave upward and, after falling, together with the upper surface of the next tube section 10, forms a grouting material flow channel 16. The grouting material flow channel 16 is connected to the opening 154 at the bottom of each grouting sleeve 15 to allow grouting material to flow. The grout outlet is located above the grouting hole.

[0130] Based on the above scheme, in the S6 cylinder section connection step, only one grouting hole 152 is retained, and the other grouting holes are sealed. Grouting is performed through the retained grouting hole 152, and the grout discharge from each grout outlet hole 153 is observed. The grout outlet holes 153 that have discharged grout are then sealed. When grout discharge from all grout outlet holes 153 is observed and sealed, the grouting is completed. In this scheme, when grout discharge is observed from the grout outlet hole 153, it proves that the inside of the grouting sleeve 15 has been filled with grout, and the grouting situation can be directly observed, ensuring the grouting effect.

[0131] In other embodiments, the upper and lower cylinder sections 10 are connected by a corrugated sleeve 18, as shown in the following specific scheme.

[0132] As shown in Figures 16-18, a corrugated sleeve 18 is built into the lower part of each tower tube segment 12, and a connecting steel bar 19 located in the same vertical direction as the corrugated sleeve 18 is built into the top of each tower tube segment 12. The connecting steel bar 19 extends from the top of the tower tube segment 12. The corrugated sleeve 18 is hollow inside and has a grouting port 181 communicating with the outside at the top. The bottom of the corrugated sleeve 18 is open so that the connecting steel bar 19 at the top of the next tube segment 10 can be inserted into it. The side surface of the corrugated sleeve 18 is corrugated.

[0133] Based on the above scheme, in the S5 tower lowering step, when the installed part of the wind turbine tower 1 falls to the top of the currently installed section 10, the connecting steel bar 19 extending from the top of the currently installed section 10 is inserted into the corrugated sleeve 18 at the bottom of the previous section 10; in the S6 section connection step, grout is injected into the corrugated sleeve 18 through the grouting port 181 to achieve a solid connection between the upper and lower sections 10.

[0134] In some embodiments, when the construction system for the wind turbine tower includes the aforementioned peripheral limiting system 5, the construction system steps for setting up the wind turbine tower also include the step of setting up the peripheral limiting system. Specifically, multiple support frames 51 are erected on the installation foundation 7, and a limiting ring 52 is fitted around the outer periphery of the installed portion of the wind turbine tower 1. The limiting ring 52 is supported by the support frames 51, and multiple rollers 53 are provided circumferentially on the limiting ring 52. The rolling surfaces of the rollers 53 are located on the inner surface side of the limiting ring 52 and contact the outer surface of the installed portion of the wind turbine tower 1. The multiple rollers 53 cooperate with each other to limit the horizontal displacement of the wind turbine tower 1. Optionally, the limiting ring 52 is spliced ​​together from multiple ring segments 521, so that the inner diameter of the limiting ring 52 can be varied to adapt to the change in the outer diameter of the cylinder section 10.

[0135] During the above construction process, as the lifting platform 3 lifts and lowers the installed part of the wind turbine tower 1, the external limiting system 5 always limits the horizontal displacement of the wind turbine tower 1, so that the wind turbine tower 1 can always remain in the vertical direction during the lifting and lowering process, preventing the wind turbine tower 1 from tilting or horizontally displacing, thereby improving the installation accuracy and construction efficiency.

[0136] In some embodiments, during the construction of the wind turbine tower 1 and / or after all sections 10 are installed, a rope restraint step S9 is also included. Specifically, the top of a pre-stressed rope 6 is connected to the top tower 103, and the bottom of the rope 6 is connected to the installation foundation 7. Multiple ropes 6 are provided and distributed along the inner circumference of the wind turbine tower 1. During construction, if strong winds occur, the pre-stressed ropes 6 are tightened to restrain the installed portion of the wind turbine tower 1. After all sections 10 are installed, the pre-stressed ropes 6 are tightened to restrain the displacement of the wind turbine tower 1 during its use. In Figure 8, some sections 10 are hidden to show the ropes 6 inside the wind turbine tower 1.

[0137] In the above scheme, during the construction of the wind turbine tower 1, the prestressed guy ropes 6 are used to tighten the tower body when extreme weather conditions such as strong winds are needed, thus restraining the tower body and preventing displacement. Once the extreme weather subsides, the guy ropes 6 are released, and construction of the tower body continues. After the construction of the wind turbine tower 1 is completed, the guy ropes 6 are tightened and kept taut at all times, providing constant restraint to the tower body during its use and improving its stability.

[0138] An embodiment of the third aspect of this application provides a wind turbine tower 1 assembled according to the construction method described in any of the embodiments of the second aspect above. Because the wind turbine tower 1 is assembled section by section from top to bottom during construction, its height is not limited by cranes or high-altitude operations, allowing it to have a higher height than existing wind turbine towers 1. The installed capacity can be increased from 2MW to 10MW, which is beneficial for further developing upper-level wind energy resources, improving wind energy utilization, and at a lower cost.

[0139] In some embodiments, the wind turbine tower 1 includes a top steel tower 105 for mounting a wind turbine generator 81 and a wind turbine blade 82, and a plurality of precast concrete sections 104 located below the top steel tower 105.

[0140] In other embodiments, the wind turbine tower 1 is assembled from multiple sections 10 from top to bottom, and all sections 10 are precast concrete sections 104.

[0141] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

Claims

1. A construction system for a wind turbine tower, wherein the wind turbine tower is assembled from multiple sections from top to bottom, characterized in that, The construction system includes: Multiple lifting devices are installed on the mounting base of the wind turbine tower. Each lifting device includes a vertically extendable lifting rod, and the lifting rods of the multiple lifting devices can extend and retract synchronously. A lifting platform is horizontally supported on the lifting rod to move up and down with the extension and retraction of the lifting rod. The size of the lifting platform is smaller than the inner diameter of the currently installed cylinder section so that the currently installed cylinder section can be covered by the lifting platform. Multiple horizontal telescopic devices are provided, which are supported by the lifting platform and move up and down synchronously with the lifting platform. Each horizontal telescopic device includes a telescopic rod that can extend and retract in the horizontal direction. The end of the telescopic rod can extend out of the outer peripheral edge of the lifting platform and insert into a groove reserved on the inner wall of the cylindrical section, so as to drive the cylindrical section to move up and down synchronously with the lifting platform.

2. The construction system for wind turbine towers according to claim 1, characterized in that, The wind turbine tower comprises n vertical sections with different inner diameters from top to bottom, as well as transition sections connecting the vertical sections with different inner diameters. The vertical sections and the transition sections are assembled sequentially in order of increasing inner diameter to form the wind turbine tower. The lifting platform comprises multiple units that can be sequentially spliced ​​from the center outward according to the construction progress, namely the first unit, the second unit, ..., the nth unit. The outer diameter of the lifting platform can be changed by splicing the units. The n units correspond sequentially to the n vertical sections with different inner diameters, and the outer diameter of the lifting platform after splicing each unit is smaller than the inner diameter of the corresponding vertical section and larger than the inner diameter of the vertical section of the previous specification.

3. The construction system for wind turbine towers according to claim 2, characterized in that, Each unit of the lifting platform is annular, and each unit is formed by splicing two or more sector-shaped annular segments in the circumferential direction. The central angles of the sector-shaped annular segments on the same radial direction of the lifting platform are equal so that they are spliced ​​together in the radial direction. The horizontal telescopic device also includes a driving device for driving the telescopic rod to perform telescopic movement. The driving device is located in the sector-shaped annular segment of the first unit and the telescopic path of the telescopic rod is located in the radial direction of the lifting platform.

4. The construction system for wind turbine towers according to claim 3, characterized in that, Each of the fan-shaped annular segments includes a base plate and four side plates located on the base plate, forming a receiving cavity between the base plate and the four side plates. A cover plate is provided on the top of the four side plates to close the receiving cavity. The side plates located on the telescopic path of the telescopic rod have corresponding through holes. A telescopic channel is formed in one or more of the receiving cavities in the same radial direction for the telescopic rod to perform telescopic movement. The telescopic rod can extend out of the lifting platform through the telescopic channel.

5. The construction system for wind turbine towers according to claim 3, characterized in that, The number of lifting devices is the same as the number of the sector-shaped annular segments on the same circumference, and each of the sector-shaped annular segments on the outer circumference is supported by one of the lifting devices.

6. The construction system for wind turbine towers according to claim 1, characterized in that, The lifting device is a hydraulic jack, which includes a hydraulic cylinder and a lifting rod that can extend and retract relative to the top of the hydraulic cylinder.

7. The construction system for wind turbine towers according to claim 1, characterized in that, It also includes an external limiting system, which includes multiple support frames erected on the installation foundation of the wind turbine tower and a limiting ring fitted around the outer periphery of the wind turbine tower. The limiting ring is supported by the support frames and has multiple rollers arranged circumferentially on the limiting ring. The rolling surface of the rollers is located on the inner surface of the limiting ring and contacts the outer surface of the wind turbine tower. The multiple rollers cooperate with each other to limit the horizontal displacement of the wind turbine tower. The limiting ring is spliced ​​from multiple parts, so that the inner diameter of the limiting ring can be changed to adapt to the change of the outer diameter of the tower section.

8. A construction method for a wind turbine tower, characterized in that, Construction is carried out using the construction system for wind turbine towers as described in any one of claims 1-7, and the construction method includes at least the following steps: The construction system for the wind turbine tower is established on the foundation of the wind turbine tower installation. Top tower construction: The top tower, located at the top of the wind turbine tower, is hoisted onto the installation foundation. A groove is pre-reserved on the inner wall of the top tower. The size of the lifting platform is smaller than the inner diameter of the top tower at the groove. The top tower is placed over the lifting platform, and the groove on the inner wall of the top tower is aligned with the extension path of the horizontal telescopic device's telescopic rod. All the telescopic rods are controlled to extend and insert into the top tower. In the groove on the inner wall; Tower lifting: Control all the lifting rods to extend synchronously so that the lifting platform is raised, and the installed part of the wind turbine tower is raised synchronously through the lifting platform so that the bottom of the installed part of the wind turbine tower is raised to a height greater than one section. Cylindrical section hoisting: Hoist the next cylindrical section onto the installation foundation and place it directly below the installed portion of the already lifted wind turbine tower. The next cylindrical section will be installed as the current cylindrical section in subsequent steps. Tower descent: Control all the lifting booms to retract synchronously so that the lifting platform descends, and the installed portion of the wind turbine tower falls to the top of the currently installed section; Cylindrical section connection: Connect the already installed part of the wind turbine tower to the currently installed cylindrical section; Lifting object conversion: Control all the telescopic rods on the lifting platform to retract and control all the lifting rods to continue retracting, so that the lifting platform descends into the interior of the currently installed cylinder section and the extension and retraction path of the telescopic rods is aligned with the groove reserved on the inner wall of the currently installed cylinder section; Control all the telescopic rods on the lifting platforms to extend and insert into the grooves on the inner wall of the currently installed cylindrical section; Repeat the tower jacking steps and subsequent steps to install the next section in sequence. After the last section is connected, dismantle the construction system.

9. The construction method for wind turbine towers according to claim 8, characterized in that, The wind turbine tower includes a top steel tower and multiple precast concrete sections located below the top steel tower. The top tower includes the top steel tower and a first precast concrete section located below the top steel tower, with the groove pre-reserved on the inner wall of the first precast concrete section. The construction steps of the top tower also include: firstly, installing the first precast concrete section on the installation foundation; then, hoisting the top steel tower onto the first precast concrete section to form the top tower; installing the wind turbine onto the top steel tower; and installing the wind turbine blades onto the wind turbine.

10. The construction method for wind turbine towers according to claim 8, characterized in that, The wind turbine tower sections are all precast concrete sections, and the top tower section is the first precast concrete section located at the top. The groove is reserved on the inner wall of the first precast concrete section. The construction steps of the top tower section also include: hoisting the first precast concrete section onto the installation foundation, installing the wind turbine onto the first precast concrete section, and installing the wind turbine blades onto the wind turbine.

11. The construction method for wind turbine towers according to claim 8, characterized in that, The wind turbine tower comprises n vertical sections with different inner diameters from top to bottom, as well as transition sections connecting the vertical sections with different inner diameters. The lifting platform includes a first unit, a second unit, ..., an nth unit that can be sequentially spliced ​​from the center outwards according to the construction progress. The n units correspond sequentially to the n vertical sections with different inner diameters, and the outer diameter of the lifting platform after splicing each unit is smaller than the inner diameter of the corresponding vertical section and larger than the inner diameter of the vertical section with the previous specification. At the beginning of construction, the lifting platform only includes the first unit corresponding to the first vertical section with the first inner diameter of the wind turbine tower. When the first cylindrical section of the next specification inner diameter or the transition cylindrical section is the currently installed cylindrical section, the construction method, after the lifting object conversion step, further includes: a step of expanding the diameter of the lifting platform. Specifically: the unit of the lifting platform corresponding to the next specification inner diameter is spliced ​​to the outer periphery of the current lifting platform. The outer diameter of the spliced ​​lifting platform is expanded but smaller than the inner diameter of the vertical cylindrical section of the next specification inner diameter. Each lifting device is moved outward to support the unit located on the outermost side of the lifting platform. The telescopic rod is controlled to extend and insert into the groove reserved on the inner wall of the first cylindrical section or transition cylindrical section of the next specification inner diameter. Then, the tower lifting step of installing the next cylindrical section is carried out.

12. The construction method for wind turbine towers according to claim 8, characterized in that, The cylindrical sections located below the top tower are all precast concrete cylindrical sections. Each precast concrete cylindrical section is formed by splicing two or more tower tube segments in the circumferential direction. The two end faces of each tower tube segment are a first end face and a second end face, respectively. The portion of the first end face near the outer side extends to form a first extension that matches the curvature of the tower tube segment. The portion of the second end face near the inner side extends to form a second extension that matches the curvature of the tower tube segment. The tower tube segments that make up a cylindrical section are spliced ​​sequentially. The first extension of one tower tube segment is spliced ​​with the second extension of the adjacent tower tube segment to form the cavity at the splicing position.

13. The construction method for wind turbine towers according to claim 12, characterized in that, The tower tube segment contains transverse reinforcing bars with the same curvature as the tower tube segment. Each transverse reinforcing bar includes a first arc-shaped segment near the outer surface of the tower tube segment, a second arc-shaped segment near the inner surface of the tower tube segment, and two connecting segments. One end of the first arc-shaped segment extends into the first extension portion, and the other end of the first arc-shaped segment protrudes from the second end face. One end of the second arc-shaped segment extends into the second extension portion, and the other end of the second arc-shaped segment protrudes from the first end face. The two connecting segments connect the first arc-shaped segment and the second arc-shaped segment at their respective ends to close the transverse reinforcing bars. In the section hoisting step, the tower tube segments constituting the next section are hoisted onto the installation foundation for splicing. After splicing, a cavity is formed at the joint position of two adjacent tower tube segments, and the transverse reinforcing bars extending from the tower tube segments are contained within the cavity. The transverse reinforcing bars extending into the cavity from two adjacent tower tube segments are arranged in a staggered manner in the longitudinal direction. In the section connection step, concrete or grout is poured into the cavity to solidify and connect each tower tube segment and the internal transverse reinforcing bars through concrete or grout, thus completing the connection of the section.

14. The construction method for wind turbine towers according to claim 12, characterized in that, A grouting sleeve is built into the bottom of each tower segment. The grouting sleeve has a grouting cavity inside. The bottom of the grouting sleeve is open and communicates with the grouting cavity. The grouting sleeve is provided with a grouting hole and a grouting outlet hole that communicate with the grouting cavity and the outside. The bottom end of the longitudinal steel bar built into the tower segment is connected to the grouting sleeve, and the top end extends out from the top of the tower segment. During the tower lowering step, when the installed portion of the wind turbine tower falls to the top of the currently installed section, the longitudinal steel bar extending from the top of the currently installed section extends into the grouting sleeve built into the bottom of the previous section; during the section connection step, grout is injected into the grouting sleeve through the grouting hole, and the grout discharge from the grout outlet is observed to achieve a solid connection between the upper and lower sections.

15. The construction method for wind turbine towers according to claim 14, characterized in that, The grouting sleeve is a semi-grouting sleeve. The bottom end of the longitudinal steel bar built into the tower tube segment is connected to the upper part of the grouting sleeve in a non-grouting manner. The bottom surface of the tower tube segment is concave upward and, after falling, together with the upper surface of the next tube segment, forms a grouting material flow channel. The grouting material flow channel is connected to the opening at the bottom of each grouting sleeve to allow grouting material to flow. The grout outlet is located above the grouting hole. In the section connection step, one grouting hole is reserved, and the other grouting holes are blocked. Grouting is carried out through the reserved grouting hole, and the grout discharge of each grout outlet is observed. The grout outlets that have discharged grout are blocked. When all grout outlets discharge grout and are blocked, the grouting is completed.

16. The construction method for wind turbine towers according to claim 12, characterized in that, A corrugated sleeve is built into the lower part of each tower tube segment, and a connecting steel bar located in the same vertical direction as the corrugated sleeve is built into the top of each tower tube segment. The connecting steel bar extends from the top of the tower tube segment. The corrugated sleeve is hollow inside and has a grouting port communicating with the outside at the top. The bottom of the corrugated sleeve is open to allow the connecting steel bar at the top of the next tube segment to be inserted therein. The side surface of the corrugated sleeve is corrugated. During the tower lowering step, when the installed portion of the wind turbine tower falls to the top of the currently installed section, the connecting steel bar extending from the top of the currently installed section is inserted into the corrugated sleeve at the bottom of the previous section; during the section connection step, grout is injected into the corrugated sleeve through the grouting port to achieve a solid connection between the upper and lower sections.

17. The construction method for wind turbine towers according to claim 8, characterized in that, During the construction of the wind turbine tower and / or after all sections are installed, a rope restraint step is also included. Specifically, the top of a pre-stressed rope is connected to the top of the tower, and the bottom of the rope is connected to the installation foundation. Multiple ropes are provided and distributed along the inner circumference of the wind turbine tower. In case of strong winds during construction, the pre-stressed ropes are tightened to restrain the installed parts of the wind turbine tower. After all sections are installed, the pre-stressed ropes are tightened to restrain the displacement of the wind turbine tower.

18. A wind turbine tower assembled according to any one of claims 8-17.

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