Method for embedding and positioning steel strand ducts and anchor plates in wind turbine foundations

Abstract

A method for embedding and positioning prestressed steel strand ducts and anchor plates in wind turbine foundations is disclosed, relating to the field of wind turbine foundation construction technology. The method includes: installing and fixing an inner template for a wind turbine column, the inner template comprising a first longitudinal inner template section, a horizontal inner template section, and a second longitudinal inner template section arranged sequentially from bottom to top; providing a prestressed steel strand duct assembly, the prestressed steel strand duct assembly comprising prestressed steel strand ducts and anchor plates; the anchor plates being disposed at the ends of the prestressed steel strand ducts; installing the prestressed steel strand duct assembly at the top of the horizontal inner template section; installing a leveling steel plate between the anchor plate and the horizontal inner template section, the thickness of the leveling steel plate gradually changing in one direction; and fixing the prestressed steel strand duct assembly and the leveling steel plate to the horizontal inner template section. This disclosed method for embedding and positioning prestressed steel strand ducts and anchor plates in wind turbine foundations is beneficial for improving the control accuracy of the inclination angle of the prestressed steel strand ducts and the installation efficiency of the prestressed steel strand ducts.

Description

Technical Field

[0001] This disclosure relates to the field of wind turbine foundation construction technology, and more specifically, to a method for embedding and positioning steel strand ducts and anchor plates in wind turbine foundations. Background Technology

[0002] The concrete foundation of a wind turbine is a crucial supporting structure for the wind turbine tower, typically consisting of a central column and an outer base plate. To withstand the enormous overturning moment and eccentric loads generated during wind turbine operation, a prestressed system is required in the foundation. This is achieved through post-tensioning of steel strands inserted into prestressed steel strand ducts, ensuring the concrete foundation is in a favorable compressive stress state before bearing the wind turbine's operating loads. This counteracts the tensile stress generated during wind turbine operation, inhibiting concrete cracking and deformation.

[0003] During construction, prestressed steel strand ducts are typically installed at a specific angle between the inner and outer formwork of the wind turbine foundation columns. The spatial position and angle of inclination of the prestressed steel strand ducts affect the stress state of the concrete structure, thereby impacting its safety. In related technologies, on-site adjustment of the inclination angle of the prestressed steel strand ducts suffers from poor precision and low efficiency, affecting the tensioning effect of the steel strands and the long-term safety of the structure. Summary of the Invention

[0004] This disclosure provides a method for embedding and positioning prestressed steel strand ducts and anchor plates in wind turbine foundations, which helps to improve the control accuracy of the inclination angle of the prestressed steel strand ducts and the installation efficiency of the prestressed steel strand ducts.

[0005] A method for embedding and positioning steel strand ducts and anchor plates in a wind turbine foundation includes: Install and fix the inner template of the wind turbine column. The inner template of the wind turbine column includes a first longitudinal inner template section, a horizontal inner template section, and a second longitudinal inner template section arranged sequentially from bottom to top. The first longitudinal inner template section is a closed circular cavity, and the second longitudinal inner template section is a closed circular cavity. The diameter of the first longitudinal inner template section is larger than that of the second longitudinal inner template section. The horizontal inner template section connects the first longitudinal inner template section and the second longitudinal inner template section. The horizontal inner template section is annular and arranged in the horizontal direction. A prestressed steel strand duct assembly is provided, which includes a prestressed steel strand duct and an anchor plate; the anchor plate is located at the end of the prestressed steel strand duct. A prestressed steel strand pipe assembly is installed at the top of the horizontal inner mold section, and a leveling steel plate is installed between the anchor plate and the horizontal inner mold section. The thickness of the leveling steel plate gradually changes in one direction. The prestressed steel strand pipe assembly and the leveling steel plate are fixed to the horizontal inner mold section.

[0006] In one exemplary embodiment of this disclosure, after fixing the prestressed steel strand duct assembly and the leveling steel plate to the horizontal inner mold section, the method for embedding and positioning the wind turbine foundation steel strand duct and anchor plate further includes fixing the top of the prestressed steel strand duct, including: A groove template is provided, which has an arc-shaped slot. Install the groove template on the top of the second longitudinal inner mold section, and insert the upper end of the prestressed steel strand pipe into the arc-shaped groove.

[0007] In one exemplary embodiment of this disclosure, the method for embedding and positioning the wind turbine foundation steel strand pipe and anchor plate further includes: installing the outer template of the wind turbine column around the second longitudinal inner template section; The top of the fixed prestressed steel strand duct includes: A groove template is provided, which has an arc-shaped slot. The groove template is installed on top of the second longitudinal inner mold section and the outer template of the fan column, and the upper end of the prestressed steel strand pipe is inserted into the arc-shaped groove.

[0008] In one exemplary embodiment of this disclosure, the groove template is installed on top of the second longitudinal inner mold section and the outer template of the wind turbine column, including: Provide fixed steel pipes and fasteners; One end of the fixed steel pipe is fixed to the top of the second longitudinal inner mold section with fasteners, and the other end of the fixed steel pipe is fixed to the top of the outer template of the fan column with fasteners. The groove template is fixed to the middle of the fixed steel pipe using fasteners.

[0009] In one exemplary embodiment of this disclosure, the prestressed steel strand duct and the anchor plate are integrally formed, and the axis of the prestressed steel strand duct is perpendicular to the plane of the anchor plate.

[0010] In one exemplary embodiment of this disclosure, a prestressed steel strand duct assembly is installed on top of a horizontal inner mold section, and a leveling steel plate is installed between an anchor plate and the horizontal inner mold section, comprising: Mark the installation position of the anchor plate at the top of the horizontal inner mold section; Place the leveling steel plate in the installation position and place the anchor plate on top of the leveling steel plate; The thicker side of the leveling steel plate faces the outer side of the horizontal inner mold section, while the thinner side faces the inner side of the horizontal inner mold section, so that the prestressed steel strand duct is inclined toward the center of the wind turbine foundation.

[0011] In one exemplary embodiment of this disclosure, the prestressed steel strand duct makes an angle of 88.53° with the horizontal plane.

[0012] In one exemplary embodiment of this disclosure, the anchor plate is provided with a first bolt hole; the leveling steel plate is provided with a second bolt hole corresponding to the first bolt hole; Fixing the prestressed steel strand duct assembly and leveling steel plate to the horizontal inner mold section includes: Use a fixing bolt to pass through the first bolt hole and into the second bolt hole to connect and tighten the fixing bolt to the top of the horizontal inner mold section.

[0013] In one exemplary embodiment of this disclosure, the groove template has a first edge and a second edge along the circumferential direction, and an arc-shaped slot is provided on the second edge; The groove template is fixed to the middle of the fixed steel pipe using fasteners, including: The first edge of the groove template is fixed to the fixed steel pipe using fasteners; The second edge of the groove template is fixed to the fixed steel pipe using fasteners; The first edge is set near the outer template of the wind turbine column, and the second edge is set near the inner template of the wind turbine column.

[0014] In one exemplary embodiment of this disclosure, installing and fixing the inner template of the wind turbine pedestal includes: A radial scaffolding support system radiating outwards from the center of the wind turbine foundation is erected; a ring-shaped steel plate is provided at the center of the radial scaffolding support system radiating outwards from the center, and a circumferential horizontal bar is provided outside the ring-shaped steel plate, and a radial horizontal bar is provided between the ring-shaped steel plate and the circumferential horizontal bar; Install the inner template of the wind turbine platform column on the periphery of the radial scaffolding support system; A radial scaffolding support system is used to apply support force to the inner formwork of the wind turbine column in order to fix the inner formwork of the wind turbine column.

[0015] This disclosed method for embedding and positioning prestressed steel strand ducts and anchor plates in wind turbine foundations utilizes a leveling steel plate with gradually varying thickness placed beneath the anchor plate. The tilt angle of the prestressed steel strand duct assembly is adjusted by utilizing the thickness variation of the wedge-shaped steel plate. The leveling steel plate can be precisely fabricated in the factory according to the design angle, ensuring accurate and consistent installation angles for each prestressed steel strand duct during installation. Compared to directly welding the anchor plate to the prestressed steel strand duct at the designed tilt angle, or adjusting by manually installing shims on-site, this method improves the control accuracy of the tilt angle of the prestressed steel strand duct and enhances installation efficiency. Furthermore, it avoids the quality instability issues that may arise from on-site welding of adjustment shims, thereby ensuring the effectiveness of subsequent steel strand tensioning and the long-term structural safety.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0018] Figure 1 This is a flowchart illustrating the method for embedding and positioning the steel strand duct and anchor plate in the wind turbine foundation disclosed herein.

[0019] Figure 2 This is a schematic diagram of the leveling steel plate in an exemplary embodiment of the method for embedding and positioning the wind turbine foundation steel strand duct and anchor plate disclosed herein.

[0020] Figure 3 This is a schematic diagram illustrating the cooperation between the leveling steel plate and the anchor plate in an exemplary embodiment of the method for embedding and positioning the wind turbine foundation steel strand duct and anchor plate disclosed herein.

[0021] Figure 4 This is a schematic diagram of a method for embedding and positioning wind turbine foundation steel strand ducts and anchor plates, as disclosed in this invention, showing the leveling steel plate and prestressed steel strand duct assembly installed at the top of a horizontal inner mold section.

[0022] Figure 5 This is a schematic diagram of a groove template in an exemplary embodiment of the method for embedding and positioning the wind turbine foundation steel strand duct and anchor plate disclosed herein.

[0023] Figure 6 This is a schematic diagram illustrating the installation of fixed steel pipes and fasteners on the top of the second longitudinal inner mold section, the groove template, and the outer template of the wind turbine column, in an exemplary embodiment of the method for embedding and positioning the wind turbine foundation steel strand pipe and anchor plate disclosed herein.

[0024] Figure 7 This is a construction site diagram of a radial scaffolding support system, which is an exemplary embodiment of the method for embedding and positioning steel strand pipes and anchor plates in the wind turbine foundation of this disclosure.

[0025] Figure 8 This is a construction site diagram showing the erection of full-span scaffolding in an exemplary embodiment of the method for embedding and positioning steel strand pipes and anchor plates for wind turbine foundations disclosed herein.

[0026] Explanation of reference numerals in the attached figures: 10. First longitudinal inner mold section; 20. Horizontal inner mold section; 30. Second longitudinal inner mold section; 41. Prestressed steel strand duct; 42. Anchor plate; 43. Leveling steel plate; 50. External formwork for the fan platform column; 60. Groove formwork; 61. Arc-shaped slot; 71. Fixed steel pipe; 72. Fasteners; 100. Radial scaffolding support system; 101. Circular steel plate; 102. Circumferential horizontal bar; 103. Radial horizontal bar; 104. Upright; 200. Full-span scaffolding. Detailed Implementation

[0027] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore detailed descriptions of them will be omitted. Furthermore, the drawings are merely illustrative of this disclosure and are not necessarily drawn to scale.

[0028] Unless otherwise specified or stated, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “a,” “an,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “comprising” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to those listed; the terms “first” and “second” are used only as illustrative marks and are not intended to limit the number, importance, or order of the objects.

[0029] The terms “connection” and “fixation” should be interpreted broadly. For example, “connection” can be a fixed connection, a movable connection, an integral connection, or a detachable connection. It can be a direct connection or an indirect connection through an intermediate medium.

[0030] The phrase "part A is located on part B" as described in this disclosure can mean that part A is directly connected to part B, or that part A is located on part C, and part C is located on part B.

[0031] The embedding and positioning of prestressed steel strand ducts and anchor plates in the concrete foundation of hybrid wind turbines is a key technical measure for modern wind power projects to meet the challenges of high hubs, large rotors, and new tower structures. As wind turbines develop towards higher nacelles and larger rotors, the eccentric loads on the hybrid tower body and the concrete foundation of the wind turbine have increased significantly. Traditional hybrid towers, to meet the requirements of crack control and deflection calculation under large spans, often require a significant increase in the reinforcement ratio of the precast blocks. This not only leads to excessively dense reinforcement in the precast blocks, affecting the quality of concrete pouring and vibration, but also significantly increases project costs. Embedding prestressed steel strand ducts and anchor plates, and applying prestress through external post-tensioning, can actively apply pre-compression stress to the precast concrete block structure of the hybrid tower, effectively offsetting the tensile stress generated by the working load, thereby fundamentally inhibiting cracking and excessive deformation of the hybrid tower body.

[0032] The core significance of prestressed steel strand ducts and strands lies in proactively improving the stress state of the wind turbine tower structure. By precisely embedding the ducts and tensioning the steel strands, the concrete foundation and precast blocks of the wind turbine tower are placed in a favorable compressive stress state before bearing the operating loads of the wind turbine. This not only effectively prevents concrete cracking but also significantly improves the concrete's resistance to fatigue failure caused by alternating wind loads, thereby ensuring the overall stability and safety of the wind turbine tower throughout its entire life cycle. The spatial position and alignment of the prestressed steel strand ducts and anchor plates must strictly adhere to the design drawings. Any deviation will alter the stress state of the structure, affect the prestressing effect, and even jeopardize structural safety.

[0033] To address the aforementioned problems, this disclosure provides a method for embedding and positioning steel strand ducts and anchor plates in wind turbine foundations, with reference to... Figure 1 As shown, the process includes steps S1000 to S4000.

[0034] Step S1000: Install and fix the inner template of the fan column. The inner template of the fan column includes a first longitudinal inner template section 10, a horizontal inner template section 20 and a second longitudinal inner template section 30 arranged sequentially from bottom to top. The first longitudinal inner template section 10 is a closed circular cavity and the second longitudinal inner template section 30 is a closed circular cavity. The diameter of the first longitudinal inner template section 10 is larger than that of the second longitudinal inner template section 30. The horizontal inner template section 20 is connected between the first longitudinal inner template section 10 and the second longitudinal inner template section 30. The horizontal inner template section 20 is annular and arranged in the horizontal direction.

[0035] Step S2000: Provide a prestressed steel strand duct assembly, which includes a prestressed steel strand duct 41 and an anchor plate 42; the anchor plate 42 is located at the end of the prestressed steel strand duct 41.

[0036] Step S3000: Install the prestressed steel strand pipe assembly on the top of the horizontal inner mold section 20, and install the leveling steel plate 43 between the anchor plate 42 and the horizontal inner mold section 20. The thickness of the leveling steel plate 43 gradually changes in one direction.

[0037] Step S4000: Fix the prestressed steel strand pipe assembly and the leveling steel plate 43 to the horizontal inner mold section 20.

[0038] Specifically, in step S1000, the first longitudinal inner mold section 10 is located at the bottom, forming a closed circular cavity with a larger diameter; the second longitudinal inner mold section 30 is located at the top, forming a closed circular cavity with a smaller diameter; the horizontal inner mold section 20 connects the top of the first longitudinal inner mold section 10 and the bottom of the second longitudinal inner mold section 30, forming an annular plate structure and extending horizontally. The three-section structure of the first longitudinal inner mold section 10, the horizontal inner mold section 20, and the second longitudinal inner mold section 30 can adapt to the design requirements of variable cross-section of the wind turbine pedestal, while the top of the horizontal inner mold section 20 also provides an operating platform and support surface for the installation of the prestressed steel strand duct assembly.

[0039] In steps S2000 to S4000, the prestressed steel strand duct 41 provides a channel for the steel strands to pass through, while the anchor plate 42 is used to fix the bottom of the duct to the foundation structure of the horizontal inner mold section 20 and to withstand the pressure during tensioning. (Reference) Figure 2 The diagram shown is a schematic diagram of a leveling steel plate 43. Figure 3 The diagram shown illustrates the fit between a leveling steel plate 43 and an anchor plate 42 (circled in red in the diagram). Figure 4 The diagram shows the installation of the leveling steel plate 43 and the prestressed steel strand duct assembly on the top of the horizontal inner mold section 20. The leveling steel plate 43 is a wedge-shaped steel plate with a gradually changing thickness in one direction, i.e., a structure with one side thicker and the other side thinner. By varying the wedge-shaped thickness of the leveling steel plate 43, the tilt angle of the prestressed steel strand duct 41 relative to the vertical direction can be adjusted to meet the installation angle required by the design.

[0040] The disclosed method for embedding and positioning prestressed steel strand ducts and anchor plates in wind turbine foundations utilizes a leveling steel plate 43 with gradually varying thickness, placed beneath the anchor plate 42. The tilt angle of the prestressed steel strand duct assembly is adjusted by utilizing the thickness variation of the wedge-shaped steel plate. The leveling steel plate 43 can be precisely fabricated in the factory according to the design angle, ensuring accurate and consistent installation angles for each prestressed steel strand duct 41 during installation. Compared to directly welding the anchor plate 42 to the prestressed steel strand duct 41 at the designed tilt angle, or adjusting by manually installing shims on-site, this method improves the control accuracy of the tilt angle of the prestressed steel strand duct 41 and enhances installation efficiency. Furthermore, it avoids the quality instability issues that may arise from on-site welding of adjustment shims, thereby ensuring the effectiveness of subsequent steel strand tensioning and the long-term structural safety.

[0041] In one exemplary embodiment of this disclosure, after step S4000: fixing the prestressed steel strand duct assembly and the leveling steel plate 43 to the horizontal inner mold section 20, the method for embedding and positioning the wind turbine foundation steel strand duct and anchor plate further includes step S5000: fixing the top of the prestressed steel strand duct 41. Specifically, this includes steps S5100 to S5200.

[0042] Step S5100: Provide a groove template 60, on which an arc-shaped slot 61 is provided.

[0043] Step S5200: Install the groove template 60 on the top of the second longitudinal inner mold section 30, and make the upper end of the prestressed steel strand pipe 41 fit into the arc-shaped groove 61.

[0044] Specifically, refer to Figure 5 The diagram shown illustrates multiple grooved templates 60 stacked together. Figure 6 The diagram shows the groove template 60 installed on the top of the second longitudinal inner mold section 30. The curvature and dimensions of the arc-shaped groove 61 match the outer diameter of the prestressed steel strand duct 41. By installing the groove template 60 on the top of the second longitudinal inner mold section 30 and engaging the upper end wall of the prestressed steel strand duct 41 within the arc-shaped groove 61, the limiting function of the groove template 60 can be used to position and fix the top of the prestressed steel strand duct 41. The groove template 60 can precisely and stably limit the position of the top of the prestressed steel strand duct 41, thereby further improving the control accuracy of the tilt angle of the prestressed steel strand duct 41 and preventing its displacement during subsequent construction.

[0045] In one exemplary embodiment of this disclosure, the method for embedding and positioning the wind turbine foundation steel strand duct and anchor plate further includes step S6000: installing the outer template 50 of the wind turbine column around the second longitudinal inner template section 30. A concrete cavity for the column to be poured is formed between the outer template 50 and the inner template of the wind turbine column, and the prestressed steel strand duct 41 is located in the cavity. Exemplarily, step S6000 can be performed before step S5000. Specifically, step S5000: fixing the top of the prestressed steel strand duct 41 may include the following steps S5300 to S5400.

[0046] Step S5300: Provide a groove template 60, which has an arc-shaped slot 61.

[0047] Step S5400: Install the groove template 60 on the top of the second longitudinal inner mold section 30 and the outer template 50 of the fan column, and make the upper end of the prestressed steel strand pipe 41 fit into the arc-shaped groove 61.

[0048] In this exemplary embodiment, reference is made to Figure 6 As shown, the grooved template 60 can be connected to the top of both ends of the inner template of the wind turbine column and the outer template 50 of the wind turbine column, which further enhances the stability and support rigidity of the grooved template 60, so that the top of the prestressed steel strand pipe 41 can withstand greater impact during concrete pouring and is less likely to shift or deviate.

[0049] In one exemplary embodiment of this disclosure, step S5400, which involves installing the groove template 60 on the top of the second longitudinal inner mold section 30 and the outer template 50 of the wind turbine column, may include steps S5410 to S5430.

[0050] Step S5410: Provide the fixing steel pipe 71 and fastener 72.

[0051] Step S5420: Fix one end of the fixed steel pipe 71 to the top of the second longitudinal inner mold section 30 using fastener 72, and fix the other end of the fixed steel pipe 71 to the top of the outer template 50 of the fan column using fastener 72.

[0052] Step S5430: Fix the groove template 60 to the middle of the fixed steel pipe 71 using fasteners 72.

[0053] In this exemplary embodiment, reference is made to Figure 6As shown, the fixed steel pipe 71 radially spans above the concrete pouring cavity of the wind turbine column. The two ends of the fixed steel pipe 71 can be supported by the inner template and outer template 50 of the wind turbine column, respectively. The groove template 60 is fixed to the middle of the fixed steel pipe 71 by fasteners 72, that is, between the inner template and the outer template 50 of the wind turbine column. This exemplary embodiment can firmly fix the position of the groove template 60 using the inner template and outer template 50 of the wind turbine column, which helps to avoid a decrease in the installation accuracy of the prestressed steel strand duct 41 due to deformation or displacement of the groove template 60.

[0054] By way of example, as will be understood by those skilled in the art, the wind turbine platform is cylindrical, the groove template 60 is segmented in an arc shape, and the segments of the groove template 60 can be joined together circumferentially to form an annular groove template 60. (Reference) Figure 6 As shown, the groove template 60 has a first edge and a second edge along the circumferential direction, and an arc-shaped groove 61 is provided on the second edge for clamping the prestressed steel strand pipe 41. In step S5430: the groove template 60 is fixed to the middle of the fixed steel pipe 71 by fastener 72, which may include the following steps S5431 and S5432.

[0055] Step S5431: Fix the first edge of the groove template 60 to the fixed steel pipe 71 using fasteners 72.

[0056] Step S5432: Fix the second edge of the groove template 60 to the fixing steel pipe 71 using fasteners 72.

[0057] The first edge is set near the outer template 50 of the wind turbine column, and the second edge is set near the inner template of the wind turbine column.

[0058] Specifically, when fixing the upper end of the prestressed steel strand pipe 41 with the groove template 60, the first edge of the groove template 60 can be fixed to the fixed steel pipe 71 with the fastener 72, and the second edge of the groove template 60 can also be fixed to the same fixed steel pipe 71 with the fastener 72. In this way, both the inner and outer sides of the groove template 60 are pressed tightly, which further ensures the stability of the engagement between the arc-shaped groove 61 and the prestressed steel strand pipe 41.

[0059] In one exemplary embodiment of this disclosure, the prestressed steel strand duct 41 and the anchor plate 42 are integrally formed, and the axis of the prestressed steel strand duct 41 is perpendicular to the plane of the anchor plate 42. Exemplarily, the anchor plate 42 is welded to the end of the prestressed steel strand duct 41. Through customized factory processing, a firm connection and precise perpendicularity between the anchor plate 42 and the prestressed steel strand duct 41 can be ensured, avoiding quality problems such as perpendicularity deviation and incomplete welding that may occur during on-site welding. This improves the installation accuracy of the prestressed steel strand duct 41 and shortens on-site construction time.

[0060] In one exemplary embodiment of this disclosure, step S3000: installing a prestressed steel strand pipe assembly on the top of the horizontal inner mold section 20 and installing a leveling steel plate 43 between the anchor plate 42 and the horizontal inner mold section 20 may include the following steps S3100 to S3200.

[0061] Step S3100: Mark the installation position of the anchor plate 42 at the top of the horizontal inner mold section 20.

[0062] Step S3200: Place the leveling steel plate 43 in the installation position and place the anchor plate 42 on top of the leveling steel plate.

[0063] The thicker side of the leveling steel plate 43 faces the outside of the horizontal inner mold section 20, and the thinner side of the leveling steel plate 43 faces the inside of the horizontal inner mold section 20, so that the prestressed steel strand duct 41 is inclined toward the center of the wind turbine foundation.

[0064] Specifically, in step S3100, a measuring instrument (such as a total station) can be used to mark the installation position of the anchor plate 42 at the top of the horizontal inner mold section 20. Then, in step S3200, the leveling steel plate 43 is placed at the marked installation position, and the anchor plate 42 is placed on top of the leveling steel plate 43. During placement, the thicker side of the leveling steel plate 43 is positioned closer to the outer side of the horizontal inner mold section 20 (i.e., the side away from the center of the wind turbine foundation), and the thinner side of the leveling steel plate 43 is positioned closer to the inner side of the horizontal inner mold section 20 (i.e., the side closer to the center of the wind turbine foundation). In this way, the prestressed steel strand duct 41 is tilted towards the center of the wind turbine foundation, achieving the tilt angle required by the design. For example, the angle between the prestressed steel strand duct 41 and the horizontal plane in a wind turbine foundation can be 88.53°. In this exemplary embodiment, precise small-angle control can be achieved through a standardized and uniformly designed leveling steel plate 43.

[0065] In one exemplary embodiment of this disclosure, for step S4000: fixing the prestressed steel strand duct assembly and the leveling steel plate 43 to the horizontal inner mold section 20, a first bolt hole can be opened on the anchor plate 42, and a second bolt hole corresponding to the first bolt hole can be opened on the leveling steel plate 43. (See reference...) Figure 2 , Figure 3 as well as Figure 4 As shown, during installation, fixing bolts are passed through the first and second bolt holes to connect and tighten the fixing bolts to the top of the horizontal inner mold section 20, thereby firmly locking the prestressed steel strand duct assembly and the leveling steel plate 43 onto the horizontal inner mold section 20. This method of connection is reliable and facilitates installation and subsequent inspection.

[0066] For example, after the top and bottom of the prestressed steel strand duct 41 are fixed, the planar position deviation, elevation deviation, and installation angle deviation of the prestressed steel strand duct 41 can be checked. For example, the check can be performed using measuring equipment such as a total station and a level to ensure that all indicators meet the quality control standards.

[0067] In some exemplary embodiments of this disclosure, the method for embedding and positioning the wind turbine foundation steel strand duct and anchor plate may also include other steps. For example, before installing the outer formwork 50 of the wind turbine column around the second longitudinal inner formwork section 30 in step S6000, a step of tying reinforcing bars is included, including tying the foundation slab reinforcing bars and the column reinforcing bars. The longitudinal and transverse reinforcing bars of the column must be arranged strictly according to the drawings and fully tied securely. Protective layer spacers are used to isolate the reinforcing bars from the wind turbine column formwork, including between the inner formwork and the outer formwork 50 of the wind turbine column, to ensure the thickness of the concrete protective layer between the reinforcing bars and the wind turbine column formwork. Exemplarily, when tying the top reinforcing bars of the column, the installation height and the distance from the grooved formwork 60 can be checked multiple times to ensure that the thickness of the concrete protective layer between the grooved formwork 60 and the reinforcing bars meets the requirements. The installation of the outer formwork 50 of the wind turbine column can be carried out by a crane, which will hoist each arc-shaped formwork to the outside of the column reinforcement in sequence. The inner side of the outer formwork can be connected and fixed to the inner formwork of the column by tie rods and top fixing steel pipes 71, and the outer formswork are connected by high-strength bolts.

[0068] In one exemplary embodiment of this disclosure, step S1000: installing and fixing the inner template of the wind turbine column may include the following steps S1100 to S1300.

[0069] Step S1100: Construct a radial scaffolding support system radiating outward from the center of the wind turbine foundation; the radial scaffolding support system 100 radiating outward from the center has an annular steel plate 101 at its center, an annular horizontal bar 102 outside the annular steel plate 101, and a radial horizontal bar 103 between the annular steel plate 101 and the annular horizontal bar 102.

[0070] Step S1200: Install the inner template of the wind turbine column on the periphery of the radial scaffolding support system 100.

[0071] Step S1300: Apply support force to the inner template of the wind turbine column using the radial scaffolding support system 100 to complete the fixing of the inner template of the wind turbine column.

[0072] In this exemplary embodiment, due to the use of a radial structure radiating outwards from the center, reference... Figure 7As shown, the overall force of the scaffolding can be evenly transmitted radially to the central annular steel plate 101. The annular steel plate 101 serves as the central positioning reference for the entire radial scaffolding support system 100, preventing the scaffolding support system from shifting its center during scaffolding erection and subsequent bearing of the lateral pressure from the inner formwork of the wind turbine column. Simultaneously, the radial horizontal bars 103 and the circumferential horizontal bars 102 work together to form a stable horizontal grid, providing a support foundation for the inner formwork of the wind turbine column and helping to ensure the cylindricity and verticality of the inner formwork after installation.

[0073] Step S1100: Erecting a radial scaffolding support system 100 radiating outward from the center of the wind turbine foundation, and may also include steps S1110 to S1120.

[0074] Step S1110: Vertically embed multiple positioning components at the center cushion layer of the wind turbine foundation.

[0075] Step S1120: The annular steel plate 101 is threaded onto multiple positioning members to form the central positioning reference of the radial scaffolding support system 100.

[0076] Specifically, multiple positioning elements can define the horizontal and vertical positions of the annular steel plate 101, thereby forming the central positioning reference of the radial scaffolding support system 100. (Reference) Figure 7 The construction site diagram of the radial scaffolding support system 100 shown (blurred to protect the privacy of construction workers) ensures that the center of each ring of the scaffolding system is consistent when erecting the uprights 104 and horizontal bars (including circumferential horizontal bars 102 and radial horizontal bars 103) outward. This ensures that the center of the finally installed inner formwork coincides with the design center, reducing the eccentricity of the inner formwork caused by center offset.

[0077] In one exemplary embodiment of this disclosure, after forming the center positioning reference of the radial scaffolding support system 100 in step S1120, step S1100: erecting a radial scaffolding support system 100 radiating outward from the center at the center of the wind turbine foundation, and also including steps S1130 to S1160.

[0078] Step S1130: Starting from the central positioning reference, erect multiple uprights 104 outwards according to the preset radial spacing.

[0079] Step S1140: After the upright 104 is erected to the preset height, install the circumferential horizontal bar 102 and make the circumferential horizontal bar 102 closed in the circumferential direction.

[0080] Step S1150: While erecting the uprights 104, install the radial horizontal bars 103 and scissor braces to form a spatially stable grid.

[0081] Step S1160: As the height of the upright 104 increases, circumferential horizontal bars 102 and radial horizontal bars 103 are installed layer by layer until the design elevation is reached, so as to form a radial scaffolding support system 100 radiating outward from the center.

[0082] Specifically, after establishing the central positioning reference for the radial scaffolding support system 100 in step S1120, the scaffolding erection continues outward. In step S1130, starting from the central positioning reference, multiple uprights 104 are erected sequentially according to a pre-set radial spacing. The distance from each upright 104 to the central positioning reference can be equal.

[0083] In step S1140, after the uprights 104 are erected to a preset height, circumferential horizontal bars 102 are installed. The circumferential horizontal bars 102 of each layer are connected circumferentially to form a closed ring structure. (Reference) Figure 7 As shown, during the installation of the circumferential horizontal bar 102, each layer of the circumferential horizontal bar 102 can be composed of multiple horizontal straight bars connected end to end, and each straight bar that makes up the circumferential horizontal bar 102 is connected to the adjacent upright bar 104.

[0084] In step S1100, while erecting the support pole 104, the radial horizontal bar 103 and the scissor brace can be installed simultaneously. (Reference) Figure 7 As shown, the radial horizontal bar 103 is radially connected between the annular steel plate 101 and the circumferential horizontal bar 102, and is distributed radially outward from the annular steel plate 101. The position and angle of the radial horizontal bar 103 can be determined by the upright bar 104 erected in step S1130, as shown in the reference. Figure 7 As shown, one end of the radial horizontal bar 103 is connected to the annular steel plate 101, and the other end is connected to the connection point of the corresponding upright 104 and the circumferential horizontal bar 102 near the end. The end of the radial horizontal bar 103 away from the annular steel plate 101 can extend radially out of the circumferential horizontal bar 102 to apply support force to the inner template of the wind turbine column, facilitating the fixation of the inner template of the wind turbine column. Scissor bracing is a cross-bracing member installed on the vertical or horizontal plane of the scaffolding, which can improve the lateral displacement resistance and overall rigidity of the scaffolding structure. Through the combined action of the radial horizontal bar 103, the circumferential horizontal bar 102, and the scissor bracing, the scaffolding can form a spatially stable grid in both the vertical and horizontal directions.

[0085] In step S1160, as the height of the uprights 104 increases, the above process is repeated layer by layer to erect circumferential horizontal bars 102 and radial horizontal bars 103 as well as scissor bracing. That is, a layer of circumferential horizontal bars 102 and radial horizontal bars 103 is set up every time the height increases. If necessary, scissor bracing is added until the elevation required by the design is reached, and finally a complete radial scaffolding support system 100 radiating outward from the center is formed.

[0086] In the exemplary embodiment of this disclosure, a spatial grid of radial scaffolding support system 100 is formed layer by layer through steps S1130 to S1160, which helps to control the cumulative deformation of the scaffolding during the erection process. Especially for the installation of the inner formwork of the wind turbine column, which has a tall structure, this exemplary embodiment can achieve uniform force distribution through circumferential horizontal bars 102, radial horizontal bars 103, each upright 104, and scissor braces, which helps to suppress the deflection of the uprights 104 and provide solid support for the installation of the inner formwork of the wind turbine column.

[0087] In one exemplary embodiment of this disclosure, step S1200: installing the inner template of the wind turbine column on the periphery of the radial scaffolding support system 100 may include steps S1210 to S1230.

[0088] Step S1210: Pre-assemble multiple curved templates that form the inner template of the wind turbine column on the ground, check the curvature and joints, and number the multiple curved templates according to the installation sequence.

[0089] Step S1220: Use a crane to lift multiple arc-shaped templates to the periphery of the radial scaffolding support system 100 in numerical order, and arrange them sequentially along the circumference.

[0090] Step S1230: Use bolts to connect and fix the horizontal and vertical seams of adjacent arc-shaped templates to form a closed circular cavity.

[0091] Specifically, the process begins with pre-assembling multiple curved templates forming the inner formwork of the wind turbine column on the ground. The curvature of each template is checked to ensure it meets design requirements, and the joints between adjacent templates are tight. After successful pre-assembly, the curved templates are numbered according to the installation sequence. A crane is then used to hoist the templates sequentially to the periphery of the radial scaffolding support system 100, arranging them circumferentially. Adjacent curved templates are connected and fixed at both horizontal and vertical joints using multiple bolts, such as 16mm diameter bolts, with several bolts at each joint to ensure connection strength. Once all curved templates are connected, a single, closed circular cavity is formed—the inner formwork of the wind turbine column. Because the templates are pre-assembled and numbered before hoisting, on-site installation only requires sequential hoisting and assembly, followed by bolt tightening. This shortens the time for high-altitude adjustments and corrections, improving installation efficiency and reducing gap deviations caused by improper assembly, thus enhancing construction quality.

[0092] For example, firstly, the first longitudinal inner formwork section 10 is installed on the periphery of the radial scaffolding support system 100 according to the aforementioned steps S1210 to S1230. After the first longitudinal inner formwork section 10 is fixed, the horizontal inner formwork section 20 is installed on its top. The outer edge of the horizontal inner formwork section 20 is connected to the top circle of the first longitudinal inner formwork section 10, and can be connected by high-strength bolts to ensure the connection strength between the horizontal inner formwork section 20 and the first longitudinal inner formwork section 10, control the up and down floating of the horizontal inner formwork section 20 during the subsequent concrete pouring process, and ensure that the installation of the inner formwork of the wind turbine column meets the design requirements. After the horizontal inner formwork section 20 is erected, a radial scaffolding support system 100 is erected upwards, with its height exceeding the elevation of the horizontal inner formwork section 20. Then, a second longitudinal inner formwork section 30 is installed on top of the horizontal inner formwork section 20. The inner edge of the horizontal inner formwork section 20 is connected to the bottom circle of the second longitudinal inner formwork section 30, and the connection can be made by high-strength bolts to ensure the connection strength between the horizontal inner formwork section 20 and the second longitudinal inner formwork section 30.

[0093] When installing the horizontal inner formwork section 20 on the top of the first longitudinal inner formwork section 10, a full-span scaffold 200 can be erected on the top of the first longitudinal inner formwork section 10, and then multiple horizontal plates connected in sequence along the circumferential direction can be laid on the top of the full-span scaffold 200 to form the horizontal inner formwork section 20.

[0094] Specifically, a full-span scaffolding 200 is erected on top of the first longitudinal inner formwork section 10, as shown in the reference. Figure 8The diagram shows the construction site of the full-span scaffolding 200. The full-span scaffolding 200 is a planar support frame constructed from numerous uprights and horizontal bars arranged in a dense grid pattern, used to support the horizontal slabs laid on top. After the full-span scaffolding 200 is erected, multiple horizontal slabs are laid on top, sequentially spliced ​​along the circumference. These horizontal slabs together form a ring-shaped horizontal inner formwork section 20.

[0095] The full-span scaffolding 200 provides longitudinal support for the horizontal inner formwork section 20, ensuring that the top of the horizontal inner formwork section 20 will not sink or deform under the weight of the concrete during subsequent concrete pouring between the inner and outer formwork of the wind turbine column. Furthermore, in some embodiments, the horizontal inner formwork section 20 can be pre-stressed. During concrete pouring, the horizontal inner formwork section 20 relies on the weight of the concrete at its top and the high-strength bolts connecting it to the first longitudinal inner formwork section 10 and the second longitudinal inner formwork section 30 to control its vertical movement, ensuring that the final elevation and levelness of the horizontal inner formwork section 20 meet design requirements, and that the installation of the wind turbine column inner formwork meets the specifications.

[0096] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. A method for embedding and positioning steel strand ducts and anchor plates in a wind turbine foundation, characterized in that, include: Install and fix the inner template of the wind turbine column. The inner template of the wind turbine column includes a first longitudinal inner mold section (10), a horizontal inner mold section (20), and a second longitudinal inner mold section (30) arranged sequentially from bottom to top. The first longitudinal inner mold section (10) is a closed circular cavity, and the second longitudinal inner mold section (30) is a closed circular cavity. The diameter of the first longitudinal inner mold section (10) is larger than that of the second longitudinal inner mold section (30). The horizontal inner mold section (20) is connected between the first longitudinal inner mold section (10) and the second longitudinal inner mold section (30). The horizontal inner mold section (20) is annular and arranged in the horizontal direction. A prestressed steel strand duct assembly is provided, the prestressed steel strand duct assembly including a prestressed steel strand duct (41) and an anchor plate (42); the anchor plate (42) is disposed at the end of the prestressed steel strand duct (41); The prestressed steel strand pipe assembly is installed on top of the horizontal inner mold section (20), and a leveling steel plate (43) is installed between the anchor plate (42) and the horizontal inner mold section (20), the thickness of the leveling steel plate (43) gradually changing in one direction; The prestressed steel strand pipe assembly and the leveling steel plate (43) are fixed to the horizontal inner mold section (20).

2. The method for embedding and positioning the steel strand duct and anchor plate in the wind turbine foundation according to claim 1, characterized in that, After fixing the prestressed steel strand duct assembly and the leveling steel plate (43) to the horizontal inner mold section (20), the method for embedding and positioning the wind turbine foundation steel strand duct and anchor plate further includes fixing the top of the prestressed steel strand duct (41), including: A groove template (60) is provided, wherein the groove template (60) is provided with an arc-shaped slot (61); The groove template (60) is installed on the top of the second longitudinal inner mold section (30), and the upper end wall of the prestressed steel strand pipe (41) is inserted into the arc-shaped groove (61).

3. The method for embedding and positioning the steel strand duct and anchor plate in the wind turbine foundation according to claim 2, characterized in that, The method for embedding and positioning the wind turbine foundation steel strand pipe and anchor plate further includes: installing the outer template (50) of the wind turbine column on the periphery of the second longitudinal inner template section (30). Fixing the top of the prestressed steel strand duct (41) includes: A groove template (60) is provided, wherein an arc-shaped slot (61) is provided on the groove template (60); The groove template (60) is installed on the top of the second longitudinal inner mold section (30) and the outer template (50) of the wind turbine column, and the upper end wall of the prestressed steel strand pipe (41) is inserted into the arc-shaped groove (61).

4. The method for embedding and positioning the wind turbine foundation steel strand duct and anchor plate according to claim 3, characterized in that, Installing the groove template (60) on top of the second longitudinal inner mold section (30) and the outer template (50) of the wind turbine column includes: Provide a fixed steel pipe (71) and fasteners (72); One end of the fixed steel pipe (71) is fixed to the top of the second longitudinal inner mold section (30) by means of the fastener (72), and the other end of the fixed steel pipe (71) is fixed to the top of the outer template (50) of the fan column by means of the fastener (72). The groove template (60) is fixed to the middle of the fixed steel pipe (71) by the fastener (72).

5. The method for embedding and positioning the steel strand duct and anchor plate in the wind turbine foundation according to claim 1, characterized in that, The prestressed steel strand duct (41) and the anchor plate (42) are integrally formed, and the axis of the prestressed steel strand duct (41) is perpendicular to the plane of the anchor plate (42).

6. The method for embedding and positioning the steel strand duct and anchor plate in a wind turbine foundation according to claim 1, characterized in that, The prestressed steel strand duct assembly is installed on top of the horizontal inner mold section (20), and a leveling steel plate (43) is installed between the anchor plate (42) and the horizontal inner mold section (20), including: The installation position of the anchor plate (42) is marked on the top of the horizontal inner mold section (20); Place the leveling steel plate (43) at the installation position and place the anchor plate (42) above the leveling steel plate; The thicker side of the leveling steel plate (43) faces the outer side of the horizontal inner mold section (20), and the thinner side of the leveling steel plate (43) faces the inner side of the horizontal inner mold section (20), so that the prestressed steel strand pipe (41) is inclined toward the center of the wind turbine foundation.

7. The method for embedding and positioning the steel strand duct and anchor plate in a wind turbine foundation according to claim 6, characterized in that, The angle between the prestressed steel strand duct (41) and the horizontal plane is 88.53°.

8. The method for embedding and positioning the steel strand duct and anchor plate in the wind turbine foundation according to claim 5, characterized in that, The anchor plate (42) is provided with a first bolt hole; the leveling steel plate (43) is provided with a second bolt hole corresponding to the first bolt hole. Fixing the prestressed steel strand pipe assembly and the leveling steel plate (43) to the horizontal inner mold section (20) includes: Using a fixing bolt passed through the first bolt hole and into the second bolt hole, the fixing bolt is connected to and tightened to the top of the horizontal inner mold section (20).

9. The method for embedding and positioning the steel strand duct and anchor plate in a wind turbine foundation according to claim 4, characterized in that, The groove template (60) has a first edge and a second edge along the circumferential direction, and the arc-shaped slot (61) is provided on the second edge; Fixing the groove template (60) to the middle of the fixed steel pipe (71) using the fastener (72) includes: The first edge of the groove template (60) is fixed to the fixed steel pipe (71) by the fastener (72); The second edge of the groove template (60) is fixed to the fixed steel pipe (71) by the fastener (72); The first edge is located near the outer template (50) of the wind turbine column, and the second edge is located near the inner template of the wind turbine column.

10. The method for embedding and positioning the steel strand duct and anchor plate in a wind turbine foundation according to claim 1, characterized in that, Install and secure the inner template of the wind turbine support column, including: A radial scaffolding support system radiating outward from the center is erected at the center of the wind turbine foundation; a ring-shaped steel plate (101) is provided at the center of the radial scaffolding support system (100) radiating outward from the center, a circumferential horizontal bar (102) is provided outside the ring-shaped steel plate (101), and a radial horizontal bar (103) is provided between the ring-shaped steel plate (101) and the circumferential horizontal bar (102). The inner template of the wind turbine column is installed on the periphery of the radial scaffolding support system (100); The radial scaffolding support system (100) is used to apply a supporting force to the inner template of the wind turbine column in order to fix the inner template of the wind turbine column.

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