Screw prestress prefabricated radial beam plate type fan foundation and construction method thereof

Abstract

The invention discloses a screw prestressing prefabricated radial beam slab type fan foundation and a construction method thereof. The screw prestressing prefabricated radial beam slab type fan foundation comprises a beam pier combined prefabricated part, an anchor disc, a horizontal anchor rod, a vertical anchor bolt, a connecting plate, an upper anchor plate and a lower anchor plate. The fan foundation is formed by annularly arranging and splicing a plurality of beam and pier combined prefabricated parts, a plurality of rows of horizontal reserved hole channels are formed in the step-variable beam plate, and horizontal anchor rods are anchored to a connecting anchor plate in the center of the foundation and the outer side of the foundation through the reserved hole channels to lock the foundation. And connecting plates are arranged between the variable-step beam plates, so that the consistency of the whole structure is improved. A vertical preformed hole is formed in the middle pier on the inner side of the step-variable beam plate, and fan tower tube anchor plate grooves are reserved in the upper surface and the lower surface of the middle pier, so that vertical anchor bolt installation is facilitated. The foundation is reasonable in form stress, and the collision problem between the horizontal anchor rods is avoided by adopting a connection anchor plate pulling mode; and grouting-free dry operation on a construction site can be achieved, installation is convenient, efficient and environmentally friendly, and the problem that the temperature of a core area is too high in the traditional fan foundation construction process is effectively solved.

Description

Technical Field

[0001] The invention belongs to the technical field of wind power generation, and relates to a screw prestressed prefabricated radial beam-plate type fan foundation and a construction method thereof. Background Art

[0002] The wind turbine foundation is the structural foundation that bears the wind turbine's own weight and wind load in the wind turbine system, and plays the role of load-bearing support. Because the wind turbine is a tall structure, when subjected to horizontal wind load, its horizontal force and bottom bending moment are very large, and the wind turbine is sensitive to the inclination of the tower, and has high requirements for uneven foundation settlement. The wind turbine foundation needs to bear vertical loads, horizontal loads, uplift forces, and vibrations or dynamic effects generated by the wind turbine. Wind turbine foundations generally include extended foundations, pile foundations, anchor foundations, etc., which are usually cast-in-place concrete structures. It is necessary to tie steel bars, pour concrete and maintain them at the construction site, which takes about a month. The pouring process of the wind turbine foundation has high requirements for the environment. Too high or too low temperature will affect the quality of the foundation. There is a long construction interruption period for construction sites with changeable climates. In addition, the pouring and maintenance by the construction unit on site causes the construction quality of the wind turbine foundation to be affected by many uncertain factors, including the experience of the construction team. In general, the mainstream wind turbine foundation forms on the market are mainly cast on site, but the construction quality of cast-in-place foundations is difficult to control, the construction period is long, the environmental impact is large, and for special areas, commercial concrete cannot be effectively transported, and the quality of concrete from self-built mixing stations is uncontrollable, which will have a great impact on engineering construction. Summary of the invention

[0003] The purpose of the present invention is to design a screw prestressed prefabricated radial beam-slab wind turbine foundation to solve the problems raised by the above background technology that the current on-site construction period of wind power foundation is long and the construction quality is difficult to control, while ensuring that the wind turbine foundation is easy to install and safe and reliable.

[0004] To achieve the above object, the present invention provides the following technical solutions: A screw-prestressed prefabricated radial beam-slab wind turbine foundation, characterized in that it includes a beam-pier assembly prefabricated part, an anchor plate, a horizontal anchor rod, a connecting plate, a vertical anchor bolt and an anchor plate; the beam-pier assembly prefabricated part is a component composed of a middle pier, a main beam and a bottom plate, and the beam-pier assembly prefabricated part has a fan-shaped feature and can form a hollow annular foundation structure by splicing a plurality of beam-pier assembly prefabricated parts in a ring arrangement; the connecting plate is arranged between two adjacent beam-pier assembly prefabricated parts and is connected by a horizontal groove and a socket type; the beam-pier assembly prefabricated part is provided with a plurality of horizontal and vertical anchor bolt reserved holes for arranging horizontal anchor rods and vertical anchor bolts, and the end of the horizontal anchor rod close to the middle pier side is fixed on the anchor plate, and is fixed to the beam-pier assembly prefabricated part after prestress is applied from the other end.

[0005] On the basis of adopting the above technical solutions, the present invention may also adopt the following further technical solutions, or use these further technical solutions in combination: The main beam of the beam-pier combination prefabricated part is connected as a whole with the circumferential middle part of the middle pier; radially, a step is provided in the middle of the main beam, and horizontal anchor rod reserved holes are provided on the step surface. The horizontal anchor rod reserved holes are arranged radially, pass through the main beam and the middle pier and are aligned with the center of the foundation circle.

[0006] A vertical anchor bolt reserved hole is provided on the middle pier of the beam-pier combination prefabricated part. The vertical anchor bolt reserved holes are arranged in a ring shape with the foundation circle center as the center, passing through the middle pier, and grooves are provided at the top and bottom of the middle pier at corresponding positions for the installation and positioning of the top anchor plate and the bottom anchor plate.

[0007] In the radial direction, the bottom plate is located on both sides of the bottom of the main beam. The bottom plate starts from the side of the middle pier and extends to the outer edge of the main beam. The side of the bottom plate has a fan-shaped side that forms a beam-pier combination prefabricated part, and a cut parallel to the main beam is formed at the middle of the main beam to the outer edge; a horizontal groove is set at the cut position for socket connection of the connecting plate.

[0008] The side of the connecting plate is provided with a protrusion matching the groove of the cutout portion of the bottom plate, and the connecting plate is connected to the beam-pier assembly prefabricated part through the protrusion, and the connecting plate is flush with the bottom plate of the beam-pier assembly prefabricated part.

[0009] The anchor plate is in the shape of a disc, with a threaded hole on the side, and the end of the horizontal anchor rod is also provided with a thread with a matching size, and the two are connected by threads.

[0010] The connection between the beam-pier combined prefabricated component and the upper wind turbine tower flange is achieved by vertical anchor bolts passing through the vertical reserved holes in the middle pier, anchored to the top anchor plate and the bottom anchor plate, and prestressed to tension and fix them.

[0011] According to a second aspect of the present invention, the present invention further provides a construction method for constructing a screw prestressed prefabricated radial beam-slab type fan foundation as described in any one of the above items, and the technical solution thereof is as follows: A construction method for a screw prestressed prefabricated radial beam-slab type fan foundation, the steps of which are as follows: Step 1: Excavate the installation pit of the wind turbine foundation according to the design drawings, and complete the cable pipe laying path at the same time. Continue to excavate a certain depth within the circular range with the outer diameter of the middle pier of the beam-pier combination prefabricated part as the diameter, and reserve the construction space for the anchor plate and vertical anchor bolts at the bottom; For areas with poor geology, it is also necessary to cast the cushion layer. When casting the cushion layer, cast the outer area of ​​the middle pier first, and after the anchor plate and vertical anchor bolts are installed, cast the middle low-lying area to the same elevation as the top of the bottom plate; Step 2: Assemble the beam-pier assembly prefabricated parts, first position each beam-pier assembly prefabricated part; before assembling the beam-pier assembly prefabricated parts 1, clean the cushion surface and the foundation interface, and apply a certain thickness of structural adhesive material; assemble each beam-pier assembly prefabricated part in place according to the designed position in turn; Step 3: After the beam-pier combination prefabricated parts are assembled, start installing the horizontal anchor rods. Place the anchor plate at the specified height of the inner hollow area surrounded by the middle pier, and connect the horizontal anchor rods to the anchor plate through the horizontal reserved holes of the beam-pier combination prefabricated parts and fix them. The installation is completed layer by layer from low to high. After all the horizontal anchor rods are installed, tension and fix them at the anchor end on the other side of the beam-pier combination prefabricated parts. When tensioning, the opposite sides must be tensioned at the same time to ensure the overall force balance of the wind turbine foundation.

[0012] Step 4: Clean the foundation interface, insert the concrete connecting plate into the horizontal groove position of the bottom plate of the beam-pier combined prefabricated parts, and apply structural adhesive material.

[0013] Step 5: After the installation of the horizontal anchor rods and concrete connecting plates is completed, the vertical anchor bolts are installed. After the vertical anchor bolts 5 are fixed and locked with the anchor plate at the bottom, the top anchor plate and wind turbine tower flange are installed, and the upper end of the vertical anchor bolts is tensioned to achieve the design required prestress value.

[0014] Step 6: After the prestressing value of each part reaches the design requirements, backfill the foundation.

[0015] In summary, the novel screw prestressed prefabricated radial beam-slab wind turbine foundation proposed in the present invention greatly reduces on-site operation time, shortens construction period, is efficient and environmentally friendly, and has good applicability and economy. It can be widely used in the construction of wind farms with natural foundations under various terrain conditions.

[0016] Compared with the prior art, the present invention has the following beneficial effects: (1) Each prefabricated module is mainly tied together by prestressed tension anchor bolts. Prestressed tension anchor bolts can enhance the shear bearing capacity of the inclined section of the main beam of the prefabricated module, thereby reducing the required height and thickness of the main beam, further reducing the volume of concrete in the prefabricated module and improving economic efficiency. Compared with the traditional disc-type expansion foundation, the screw prestressed prefabricated radial beam-slab fan foundation under the same load conditions uses less steel and concrete when having the same bearing capacity, and has good economic efficiency.

[0017] (2) The present invention produces prefabricated components in the factory, which is less subject to interference factors than on-site construction, can avoid long-term shutdowns due to long-term rainy and snowy weather or extremely low temperatures, and is more flexible and reliable in scheduling. Due to the use of prefabricated concrete structures, the production of prefabricated blocks and wedge-type concrete base plates can be carried out in the early stages of construction, such as site leveling and foundation pit excavation, and the steel bar binding and concrete pouring and curing can be completed in advance. After the foundation pit is excavated, the prefabricated blocks can be hoisted and spliced. Compared with traditional cast-in-place foundations, it can save one month of time required for steel bar binding and concrete pouring and curing, which greatly saves construction time.

[0018] (3) The wind turbine foundation of the present invention is reasonably stressed, and the collision problem between horizontal anchor rods is avoided by connecting anchor plates. It can also realize dry operation without grouting at the construction site, and the installation is convenient, efficient and environmentally friendly, which effectively solves the problem of excessive temperature in the core area during the construction of traditional wind turbine foundations.

[0019] (4) Dividing the wind turbine foundation into prefabricated blocks of uniform size and producing them in the factory can realize batch assembly line production, thereby unifying the manufacturing standards during the production of concrete blocks and ensuring the production quality of concrete blocks. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A three-dimensional schematic diagram of a wind turbine foundation according to an embodiment of the present invention; Figure 2 A top view of a fan foundation according to an embodiment of the present invention; Figure 3 A three-dimensional schematic diagram of a beam-pier assembly prefabricated component according to an embodiment of the present invention; Figure 4 This is a front view of a beam-pier assembly prefabricated member according to an embodiment of the present invention; Figure 5 It is a side view of the beam-pier assembly prefabricated member according to an embodiment of the present invention; Figure 6 A three-dimensional schematic diagram of a connecting plate according to an embodiment of the present invention; Figure 7 A top view of a connecting plate according to an embodiment of the present invention; Figure 8 This is a schematic diagram of an anchor plate according to an embodiment of the present invention; Fig. 9 This is a schematic diagram of an anchor bolt connection according to an embodiment of the present invention; Fig.10 It is a basic cross-sectional view of an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0022] The screw rod prestressed prefabricated radial beam-slab type wind turbine foundation of the present invention is mainly composed of a plurality of beam-pier combination prefabricated parts arranged radially, which are pulled on the middle anchor plate by a plurality of horizontal anchor rods arranged radially to form an effective whole. The beam-pier combination prefabricated parts have fan-shaped features, which enable a plurality of beam-pier combination prefabricated parts to be assembled into a ring-shaped foundation structure in a ring-shaped arrangement. The inner middle pier is also combined into a ring shape. Several rows of horizontal reserved channels are arranged on the variable-step beam-slab. The horizontal anchor rods are anchored on the connecting anchor plate at the center of the foundation and on the outside of the foundation through the reserved channels. The horizontal anchor rods are applied with prestress to tension and lock. Connecting plates are arranged between the variable-step beam-slabs, and the bottom plates are connected by socket-type connecting plates, thereby making the foundation more coordinated and stable as a whole, and improving the consistency of the overall structure. A vertical reserved hole is provided in the middle pier on the inner side of the variable-step beam plate, and a wind turbine tower anchor plate groove is reserved on the upper and lower surfaces of the middle pier to facilitate the installation of vertical anchor bolts. The wind turbine foundation of the present invention is suitable for connecting with the upper wind turbine tower using the mainstream anchor bolt cage on the market, and the anchor bolt cage is installed and fixed by reserving vertical anchor bolt holes on the middle pier. The following is further described in detail with reference to the accompanying drawings.

[0023] See also Figure 1-10 The present embodiment provides a screw prestressed prefabricated radial beam-slab wind turbine foundation, comprising a beam-pier assembly prefabricated component 1, an anchor plate 2, a horizontal anchor rod 3, a connecting plate 4, a vertical anchor bolt 5, and an anchor plate 6. The inner end of the beam-pier assembly prefabricated component 1 is a middle pier 101. The beam-pier assembly prefabricated component 1 and the connecting plate 4 are reinforced concrete structural components. The anchor plate 2, the horizontal anchor rod 3, the vertical anchor bolt 5, and the anchor plate 6 are steel structural components.

[0024] like Figure 3 , 4 As shown in Figure 5, the beam-pier combination prefabricated component 1 is a combination structure of a variable-step beam, a middle pier 101 and a bottom plate 105. The variable-step beam is radially arranged, and the bottom plate 105 is located on both sides of the bottom of the variable-step beam to form two side edges of a fan shape. The middle pier 101 is located at the inner end of the variable-step beam, and its cross section is a fan shape.

[0025] The main beam of the beam-pier combination prefabricated component, i.e., the variable-step beam, is connected to the circumferential middle of the middle pier as a whole; radially, a step is provided in the middle of the main beam, and a horizontal anchor rod reserved hole 102 is provided on the step surface. The horizontal anchor rod reserved holes 102 are arranged radially, passing through the main beam and the middle pier and aligned with the center of the foundation circle. The horizontal anchor rod reserved holes 102 are arranged in multiple rows and distributed at different heights. In this embodiment, four rows of horizontal reserved holes 102 are provided, with four holes in one row. The anchoring ends of the two middle horizontal reserved holes 102 are on the step surface, and the anchoring ends of the two outer horizontal reserved holes 102 are on the part of the middle pier 101 outside the step surface. The horizontal anchor rod 3 passes through the reserved hole 102, and one end is fixed to the anchor plate 2 in the middle of the wind turbine foundation by threaded connection, and the other end is fixed to the anchoring end of the beam-pier combination prefabricated component 1 by bolts and tensioned and locked. The middle pier 101 is provided with grooves 104 for installing the anchor plates 6 at the top and bottom, respectively. The vertical reserved holes 103 implemented in conjunction with the wind turbine manufacturer are provided at the bottom of the grooves 104. The vertical reserved holes 103 on the anchor plates 6 on each middle pier 101 are arranged in a circle with the center line of the wind turbine foundation as the center. The lower end of the vertical anchor bolt 5 is anchored to the anchor plate 6 at the bottom, and the upper end passes through the anchor plate 6 at the top and is connected to the flange of the wind turbine tower and tensioned and locked. All the reserved holes are hollow steel pipes with a certain thickness. A section is provided on the bottom plate 105 of the beam-pier combination prefabricated part 1, and a horizontal groove 106 is provided at the section, which is connected to the connecting plate 4 with a socket.

[0026] like Figure 6 and Figure 7 As shown, the connecting plate 4 is a fan-shaped concrete plate, and protrusions 401 matching the horizontal grooves 106 on the sides of the bottom plate 105 of the beam-pier assembly prefabricated component 1 are arranged on three sides of the connecting plate 4. After the beam-pier assembly prefabricated component 1 is installed and fixed, the two sides of the connecting plate 4 are horizontally inserted into the horizontal grooves 106 of the bottom plate 105 of the beam-pier assembly prefabricated component 1 by means of sockets and splices, and structural adhesive materials are applied for reinforcement.

[0027] like Figure 8 , 9 As shown in 10, the anchor plate 2 is a steel disc structure with a certain thickness, which meets the requirements of connection with the horizontal anchor rods 3 and prestressing. The anchor plate 2 is radially provided with multiple reserved holes 201 with threads at a certain angle. After the horizontal anchor rod 3 passes through the reserved hole of the beam-pier combination prefabricated part 1, one end is connected to the anchor plate 2, and the other end is anchored on the beam-pier combination prefabricated part 1 and tensioned and locked. The diameter of the anchor plate 2 is smaller than the center hole of the wind turbine foundation surrounded by the middle pier 101, and it is located at the center of the center hole. After the anchor plate is tightened by the horizontal anchor rods 3 in all directions, it is in a suspended stress state, and the gaps between the horizontal anchor rods 3 can be used for maintenance and installation personnel to go up and down.

[0028] The construction steps of the screw prestressed prefabricated radial beam-slab type fan foundation are as follows: Step 1: Excavate the installation pit of the wind turbine foundation according to the design drawings, and complete the cable pipe laying path at the same time. Continue to excavate a certain depth within the circular range with the outer diameter of the middle pier 101 of the beam-pier combination prefabricated part 1 as the diameter, and reserve the construction space for the anchor plate 6 and vertical anchor bolt 5 at the bottom. For areas with poor geology, it is also necessary to cast the cushion layer. When casting the cushion layer, cast the outer area of ​​the middle pier first, and after the anchor plate 6 and vertical anchor bolt 5 are installed, cast the middle low-lying area (i.e., the construction space) to the same elevation as the top of the bottom plate.

[0029] Step 2: Assemble the beam-pier assembly prefabricated parts 1, first position each beam-pier assembly prefabricated part 1; before assembling the beam-pier assembly prefabricated parts 1, clean the cushion surface and the foundation interface, and apply a certain thickness of structural adhesive material; assemble each beam-pier assembly prefabricated part 1 in place according to the designed position in turn; Step 3: After the beam-pier combination prefabricated parts are assembled, start installing the horizontal anchor rods 3. Place the anchor plate 2 at the specified height of the inner hollow area surrounded by the middle pier 101. The horizontal anchor rods 3 are connected to the anchor plate 2 through the horizontal reserved holes 102 of the beam-pier combination prefabricated parts 1 and fixed. The installation is completed in layers from low to high. After all the horizontal anchor rods 3 are installed, tension and fix them at the anchor end on the other side of the beam-pier combination prefabricated parts 1. When tensioning, the opposite sides must be tensioned at the same time to ensure the overall force balance of the wind turbine foundation.

[0030] Step 4: Clean the foundation interface, insert the concrete connecting plate 4 into the horizontal groove 106 of the bottom plate of the beam-pier assembly prefabricated component, and apply structural adhesive material.

[0031] Step 5: After the installation of the horizontal anchor rod 3 and the concrete connecting plate 4 is completed, the vertical anchor bolt 5 is installed. The anchor plate 6 at the bottom can be supported by a bracket. After the vertical anchor bolt 5 and the bottom anchor plate 6 are fixed and locked, the bracket can be removed, and the top anchor plate 6 and the wind turbine tower flange can be installed. The upper end of the vertical anchor bolt is tensioned to achieve the design required prestress value.

[0032] Step 6: After the prestressing value of each part reaches the design requirement, the foundation is backfilled. When backfilling, only the beam and slab area of ​​the beam-pier combination prefabricated part 1 is backfilled. The inside of the middle pier can be kept hollow. A steel structure operating platform can be set up in the tower at the top of the wind turbine foundation. When necessary, you can enter the middle pier at the bottom of the foundation through the tower to perform maintenance, inspection and monitoring.

[0033] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the ideas and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A screw prestressed prefabricated radial beam-plate type fan foundation, characterized in that: The invention comprises a beam-pier assembly prefabricated component (1), an anchor plate (2), a horizontal anchor rod (3), a connecting plate (4), a vertical anchor bolt (5) and an anchor plate (6); the beam-pier assembly prefabricated component is a component consisting of a middle pier (101), a main beam and a bottom plate (105); the beam-pier assembly prefabricated component has a fan-shaped feature and can be formed into a hollow annular foundation structure by splicing a plurality of beam-pier assembly prefabricated components in an annular arrangement; the connecting plate (4) is arranged between two adjacent beam-pier assembly prefabricated components (1) and connected in a socket-type manner via a horizontal groove; the beam-pier assembly prefabricated component is provided with a plurality of horizontal and vertical anchor bolt pre-reserved holes for arranging horizontal anchor rods and vertical anchor bolts; the end of the horizontal anchor rod close to the middle pier is fixed to the anchor plate and fixed to the beam-pier assembly prefabricated component after prestress is applied from the other end.

2. A screw rod prestressed prefabricated radial beam-slab type fan foundation according to claim 1, characterized in that: The main beam of the beam-pier combination prefabricated component is connected to the circumferential middle of the middle pier as a whole; in the radial direction, a step is provided in the middle of the main beam, and horizontal anchor rod reserved holes (102) are provided on the step surface. The horizontal anchor rod reserved holes (102) are arranged radially, pass through the main beam and the middle pier, and are aligned with the center of the foundation circle.

3. The screw rod prestressed prefabricated radial beam-slab type fan foundation according to claim 1, characterized in that: The middle pier (101) of the beam-pier assembly prefabricated component (1) is provided with vertical anchor bolt reserved holes (103), the vertical anchor bolt reserved holes (103) are arranged in a ring shape with the foundation circle center as the center, penetrate the middle pier, and grooves (104) are provided at the top and bottom of the middle pier at corresponding positions for installing and positioning the top anchor plate (6) and the bottom anchor plate (6).

4. The screw rod prestressed prefabricated radial beam-slab type fan foundation according to claim 1, characterized in that: In the radial direction, the bottom plate (105) is located on both sides of the bottom of the main beam. The bottom plate (105) starts from the side of the middle pier and extends to the outer edge of the main beam. The side of the bottom plate has a fan-shaped side that forms a beam-pier combination prefabricated part, and a cut parallel to the main beam is formed at the middle of the main beam toward the outer edge. A horizontal groove (106) is provided at the cut position for socket connection of the connecting plate (4).

5. The screw rod prestressed prefabricated radial beam-slab type fan foundation according to claim 4, characterized in that: The side of the connection plate (4) is provided with a protrusion (401) matching the groove (106) at the cutout portion of the bottom plate, the connection plate (4) is connected to the beam-pier assembly prefabricated component (1) through the protrusion, and the connection plate (4) is flush with the bottom plate (105) of the beam-pier assembly prefabricated component (1).

6. The screw rod prestressed prefabricated radial beam-slab type fan foundation according to claim 1, characterized in that: The anchor plate (2) is in the shape of a circular plate, with a threaded hole (201) provided on the side thereof, and the end of the horizontal anchor rod (3) is also provided with a thread of matching size, and the two are connected via threads.

7. The screw rod prestressed prefabricated radial beam-slab type fan foundation according to claim 3, characterized in that: The connection between the beam-pier assembly prefabricated component (1) and the upper wind turbine tower flange is achieved by passing a vertical anchor bolt (5) through a vertical reserved hole (103) in the middle pier, anchoring the top anchor plate (6) and the bottom anchor plate (6), and applying prestress to tension and fix them.

8. A construction method for a screw prestressed prefabricated radial beam-slab type fan foundation, characterized in that: The steps for constructing the screw prestressed prefabricated radial beam-slab fan foundation as described in any one of claims 1 to 7 are as follows: Step 1: Excavate the installation pit of the wind turbine foundation according to the design drawings, and complete the cable pipe laying path at the same time. Continue to excavate a certain depth within the circular range with the outer diameter of the middle pier of the beam-pier combination prefabricated part as the diameter, and reserve the construction space for the anchor plate and vertical anchor bolts at the bottom; For areas with poor geology, it is also necessary to cast the cushion layer. When casting the cushion layer, cast the outer area of ​​the middle pier first, and after the anchor plate and vertical anchor bolts are installed, cast the middle low-lying area to the same elevation as the top of the bottom plate; Step 2: Assemble the beam-pier assembly prefabricated parts, first position each beam-pier assembly prefabricated part; before assembling the beam-pier assembly prefabricated parts 1, clean the cushion surface and the foundation interface, and apply a certain thickness of structural adhesive material; assemble each beam-pier assembly prefabricated part in place according to the designed position in turn; Step 3: After the beam-pier combination prefabricated parts are assembled, start installing the horizontal anchor rods. Place the anchor plate at the specified height of the inner hollow area surrounded by the middle pier. Connect the horizontal anchor rods to the anchor plate through the horizontal reserved holes of the beam-pier combination prefabricated parts and fix them. Install them layer by layer from low to high. After all the horizontal anchor rods are installed, tension and fix them at the anchor end on the other side of the beam-pier combination prefabricated parts. When tensioning, tension the opposite sides at the same time to ensure the overall force balance of the wind turbine foundation. Step 4: Clean the foundation interface, insert the concrete connecting plate into the horizontal groove position of the bottom plate of the beam-pier combined prefabricated part, and apply structural adhesive material; Step 5: After the installation of the horizontal anchor rod and the concrete connecting plate is completed, the vertical anchor bolt is installed. After the vertical anchor bolt 5 is fixed and locked with the anchor plate at the bottom, the top anchor plate and the wind turbine tower flange are installed, and the upper end of the vertical anchor bolt is tensioned to achieve the prestress value required by the design; Step 6: After the prestressing value of each part reaches the design requirements, backfill the foundation.

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