Assembly type foundation of wind power mixed tower

Abstract

The invention provides a wind power mixed tower assembly type foundation which can better adapt to site construction operation conditions and improve the assembly speed. The wind power mixed tower assembly type foundation comprises a cast-in-place center bottom plate and a plurality of prefabricated structural parts. The multiple prefabricated structural parts are sequentially in butt joint in the circumferential direction to form an annular assembly structure. A cast-in-place center bottom plate is formed at the bottom of the center area of the annular assembly structure through pouring. The built-in part of the cast-in-place center bottom plate is downwards built in the foundation, and the convex part of the cast-in-place center bottom plate extends into the annular assembly structure; the annular assembly structure is connected with the cast-in-place center bottom plate through a plurality of joint bars; the annular assembly structure is provided with a plurality of annular tensioning assemblies in the circumferential direction, and a plurality of vertical anchor cable assemblies are arranged in the annular assembly structure.

Description

Technical Field

[0001] The invention relates to an assembled foundation, in particular to an assembled foundation for a wind power hybrid tower, and belongs to the technical field of wind power generation engineering. Background Art

[0002] The wind turbine structure includes the foundation and the upper tower, nacelle, hub and blades. The wind turbine foundation structure is an important part of the wind turbine structure. Currently, the most commonly used are the extended foundation and beam-slab foundation, in addition to pile foundation, anchor bolt foundation, etc.

[0003] With the rapid development of wind energy utilization, wind turbines tend to be larger, with longer blades, and precast concrete towers (hereinafter referred to as "mixed towers") have high rigidity, becoming the mainstream trend of high towers. Mixed towers also have higher requirements for wind power foundation structures. When constructing wind power mixed tower support structures, the foundation is usually cast in place. However, in remote sites with good wind resources, the construction of mixed tower foundation casting is difficult, and the quality of on-site casting is difficult to guarantee. Summary of the invention

[0004] In view of this, the present invention provides a wind power hybrid tower assembled foundation, which can better adapt to on-site construction conditions and improve assembly speed.

[0005] The technical solution of the present invention is: a wind power hybrid tower assembled foundation, comprising: a cast-in-place central bottom plate and a plurality of prefabricated structural members; the plurality of said prefabricated structural members are sequentially butted together along the circumferential direction to form an annular assembly structure;

[0006] The bottom of the central area of ​​the annular assembly structure is cast to form a cast-in-place central bottom plate;

[0007] The embedded part of the cast-in-place central bottom plate is embedded downward in the foundation, and the raised part extends into the interior of the annular assembly structure;

[0008] The annular assembly structure is connected to the cast-in-place central bottom plate via a plurality of dowel bars;

[0009] The annular assembly structure is provided with a plurality of annular tensioning components along the circumferential direction, and a plurality of vertical anchor cable components are arranged inside.

[0010] As a preferred embodiment of the present invention: the prefabricated structural member comprises: a prefabricated unit bottom plate, a prefabricated unit rib beam and a prefabricated unit corbel column;

[0011] The prefabricated unit bottom plate is fan-shaped; the prefabricated unit rib beam is arranged vertically to the central axis of the fan-shaped prefabricated unit bottom plate, and the prefabricated unit rib beam is set with variable beam height, and the beam height decreases from inside to outside along the radial direction;

[0012] The prefabricated unit corbel column comprises a vertical portion and a horizontal portion extending inwardly from the upper end of the vertical portion; the inner sides of the prefabricated unit bottom plate and the prefabricated unit rib beam are connected to the outer sides of the vertical portion of the prefabricated unit corbel column.

[0013] As a preferred embodiment of the present invention, the outer end of the prefabricated unit rib beam protrudes from the outer circumferential surface of the prefabricated unit bottom plate, so that the outer edge of the formed annular assembly structure is gear-shaped.

[0014] As a preferred embodiment of the present invention: a circumferential tensioning assembly is arranged on the outer side of the prefabricated unit corbel column;

[0015] The annular tensioning assembly includes: annular cable holes, annular prestressed cables and tensioning anchoring assemblies; annular cable holes are reserved circumferentially on the outer side of the vertical part of the prefabricated unit corbel column, and the annular prestressed cables are passed through each annular cable hole; both ends of the annular prestressed cables are tensioned tightly by the tensioning anchoring assemblies.

[0016] As a preferred embodiment of the present invention: a plurality of vertical anchor cable assemblies penetrating the prefabricated unit rib beams are radially arranged inside the prefabricated unit rib beams;

[0017] The vertical anchor cable assembly includes: a vertical anchor cable hole, a vertical anchor cable and an anchoring agent; a plurality of vertical anchor cable holes are radially arranged inside the prefabricated unit rib beam for the vertical anchor cable to pass through; the lower portion of the vertical anchor cable is embedded in the foundation, and the upper portion penetrates the prefabricated unit rib beam and exceeds the set length of the top surface of the prefabricated unit rib beam; the anchoring agent is filled between the vertical anchor cable hole and the vertical anchor cable.

[0018] As a preferred embodiment of the present invention: the vertical anchor cable is an anchor steel bar.

[0019] As a preferred embodiment of the present invention, adjacent prefabricated structural members are connected by grouting with U-shaped ribs.

[0020] As a preferred embodiment of the present invention: the horizontal part of the prefabricated unit corbel column is reserved with a vertical through-going tower prestressed cable channel, and a steel pipe and an anchor plate are pre-buried;

[0021] The prestressed cable channel is used for the threading and tensioning anchoring of the tower prestressed cables;

[0022] The tower prestressed cable channel is connected to the cavity, and the cavity is an area surrounded by the annular assembly structure and the cast-in-place central bottom plate.

[0023] As a preferred embodiment of the present invention: a tower bottom ring section groove and a cover plate groove are reserved on the horizontal surface of the prefabricated unit corbel column; the tower bottom ring section groove is used to connect the concrete tower bottom ring section, and the cover plate groove is used to place the foundation top cover plate.

[0024] Beneficial effects:

[0025] (1) The main body of the assembled foundation of the wind turbine hybrid tower of the present invention adopts an assembled structure, which can adapt to the construction conditions of remote sites and shorten the construction period of the hybrid tower foundation.

[0026] (2) The prefabricated foundation of the present invention is provided with a circumferential tensioning assembly, which can increase the assembly reliability between the prefabricated structural parts.

[0027] (3) In the present invention, a vertical anchor cable assembly is provided in the prefabricated unit rib beam of the prefabricated structural member, which can strengthen the anchorage between the foundation and the rock foundation, increase the pull-out bearing capacity of the foundation, improve the overall anti-overturning capacity of the foundation, enhance the site adaptability of the prefabricated foundation, and at the same time help to optimize and reduce the diameter of the foundation for easy transportation.

[0028] (4) In the present invention, the prefabricated unit rib beams of the prefabricated structural member protrude from the foundation bottom plate, so that the foundation has a gear-shaped outer edge, which can enhance the bite between the foundation and the foundation soil and improve the torsional rotation rigidity of the foundation.

[0029] (5) The cast-in-place central base plate at the bottom of the foundation of the present invention is embedded downward in the foundation, which can improve the shear resistance and anti-slip performance of the foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A three-dimensional diagram of the assembled foundation of the wind power hybrid tower of the present invention;

[0031] Figure 2 It is a front view of the assembled foundation of the wind power hybrid tower of the present invention;

[0032] Figure 3 It is a three-dimensional schematic diagram of a reinforced concrete prefabricated structural member;

[0033] Figure 4 It is a three-dimensional cross-sectional view of the assembled foundation of the wind power hybrid tower of the present invention.

[0034] In the figure: 1-cast-in-place central base plate, 101-embedded part, 102-raised part; 2-prefabricated structural member; 3-inserted reinforcement; 4-cavity; 5-annular cable channel; 6-vertical anchor cable hole; 7-inserted reinforcement hole; 8-tower prestressed cable channel; 9-tower bottom ring section groove; 10-cover plate groove; 11-annular prestressed cable; 12-vertical anchor cable; 201-prefabricated unit base plate; 202-prefabricated unit rib beam; 203-prefabricated unit corbel column. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0036] Embodiment 1:

[0037] This embodiment provides a wind turbine hybrid tower assembled foundation, which adopts an assembled structure and can better adapt to on-site construction conditions, improve assembly speed, and shorten construction period.

[0038] like Figure 1 and Figure 2 As shown, the wind power hybrid tower assembled foundation includes: a cast-in-place central bottom plate 1 and a plurality of prefabricated structural members 2; wherein the prefabricated structural members 2 are reinforced concrete prefabricated structural members.

[0039] Several such as Figure 3 The prefabricated structural members 2 shown are distributed along a circular ring to form an annular assembly structure (i.e., a plurality of reinforced concrete prefabricated structural members 2 are connected in sequence along the circumferential direction to form an annular assembly structure). The number of prefabricated structural members 2 can be set according to the number of upper mixed tower prestressed cables and the size of the structural members (in this example, the number of prefabricated structural members 2 is the same as the number of upper mixed tower prestressed cables, and each prefabricated structural member 2 is provided with a tower prestressed cable channel 8 corresponding to the mixed tower prestressed cable), for example but not limited to 16 to 24; adjacent prefabricated structural members 2 are connected by U-shaped grouting.

[0040] The bottom of the central area of ​​the formed annular assembly structure is cast to form a cast-in-place central bottom plate 1; Figure 4 As shown, the cast-in-place central base plate 1 has an embedded part 101 and a raised part 102, wherein the embedded part 101 is in the shape of an inverted truncated cone and is embedded downward in the foundation; the raised part 102 is a cylinder (the diameter is retracted compared to the embedded part 101); the raised part 102 is located on the upper end surface (large end surface) of the embedded part 101 and has a diameter smaller than the large end diameter, thereby forming an annular step surface between the embedded part 101 and the raised part 102, which is used to cooperate with the annular assembly structure so that the raised part 102 extends into the interior of the annular assembly structure.

[0041] The annular assembly structure and the cast-in-place central bottom plate 1 are connected by a plurality of dowel bars 3 to form an integral foundation structure; the plurality of dowel bars 3 include dowel bars connecting the embedded portion 101 and the annular assembly structure and dowel bars connecting the raised portion 102 and the annular assembly structure.

[0042] Specifically: a rebar insertion hole 7 is reserved at the bottom of the prefabricated structural member 2 , a rebar insertion hole 7 is arranged, and a grouting material is filled in the gap between the rebar insertion hole 7 , and the rebar insertion 3 extends into the cast-in-place central bottom plate 1 .

[0043] A cavity 4 (i.e., the area surrounded by the annular assembly structure and the cast-in-place central bottom plate 1) is formed inside the formed integral foundation structure, which facilitates the tensioning construction of the prestressed cables of the tower structure at the upper part of the foundation.

[0044] As an example, when pouring the top surface of the cast-in-place central base plate 1, a slope of 1% to 2% from the outer ring to the center can be set, and a small circular or square puddle can be arranged in the center, which is beneficial for handling the accumulated water at the bottom of the foundation cavity and facilitating construction operations in the foundation cavity.

[0045] The annular assembly structure formed by several prefabricated structural members 2 is provided with an annular tensioning assembly along the circumferential direction, and the annular tensioning assembly makes the annular assembly structure composed of the prefabricated structural members 2 fastened and fixed and connected as a whole. At the same time, a vertical anchor cable assembly is provided inside the annular assembly structure, and the lower end of the vertical anchor cable assembly is embedded in the rock layer at the bottom of the foundation, so that the foundation and the foundation have good embedding, increase the anti-pull bearing capacity of the foundation, improve the overall anti-overturning ability of the foundation, and help to optimize and reduce the diameter of the foundation, and enhance the site adaptability of the assembled foundation.

[0046] Embodiment 2:

[0047] Based on the above embodiment 1, this embodiment provides a preferred structural form of the prefabricated structural member 2.

[0048] like Figure 3 and Figure 4 As shown, the prefabricated structural member 2 includes: a prefabricated unit bottom plate 201, a prefabricated unit rib beam 202 and a prefabricated unit corbel column 203. The prefabricated unit bottom plate 201 is fan-shaped, the prefabricated unit rib beam 202 is arranged vertically to the central axis of the fan-shaped prefabricated unit bottom plate 201, and the prefabricated unit rib beam 202 is a variable beam height setting, and the beam height decreases from the inside to the outside along the radial direction; more specifically, the prefabricated unit rib beam 202 is a right-angled trapezoid, and the waist where the right angle is located is vertically arranged to the central axis of the fan-shaped prefabricated unit bottom plate 201 (that is, the middle axis of the prefabricated unit bottom plate 201 along the circumferential direction).

[0049] The prefabricated unit rib beam 202 protrudes from the outer circumferential surface of the prefabricated unit bottom plate 201 at one end away from the center (i.e., the shorter bottom edge), so that the outer edge of the formed annular assembly structure is gear-shaped (the protruding portion of the prefabricated unit rib beam 202 in each prefabricated structural member 2 forms a tooth), thereby enhancing the bite force between the foundation and the foundation soil and improving the foundation's torsional rotation stiffness.

[0050] The inner sides of the prefabricated unit bottom plate 201 and the prefabricated unit rib beam 202 (ie, the inner circumferential surface of the prefabricated unit bottom plate 201 and the other bottom edge of the prefabricated unit rib beam 202 ) are connected to the prefabricated unit corbel column 203 .

[0051] The prefabricated unit corbel column 203 includes a vertical portion and a horizontal portion extending inward from the upper end of the vertical portion; the inner sides of the prefabricated unit bottom plate 201 and the prefabricated unit rib beam 202 are connected to the outer sides of the vertical portion of the prefabricated unit corbel column 203.

[0052] An annular tensioning assembly is arranged circumferentially on the outer side of the prefabricated unit corbel column 203; the annular tensioning assembly comprises: annular cable holes 5, annular prestressed cables 11, and tensioning and anchoring assemblies; annular cable holes 5 are reserved circumferentially on the outer side of the vertical portion of the prefabricated unit corbel column 203, and the annular prestressed cables 11 are passed through each annular cable hole 5; both ends of the annular prestressed cables 11 are tensioned tightly by the tensioning and anchoring assemblies, so that the annular assembly structure is connected as a whole, thereby enhancing the integrity of the foundation.

[0053] The annular prestressed cable 11 is an unbonded prestressed steel strand.

[0054] As an example, a plurality of circumferential protrusions are distributed on the outer side of the vertical part of the prefabricated unit corbel column 203, and a through hole is circumferentially arranged inside each protrusion as a reserved annular cable channel 5. In this example, two upper and lower annular cable channels 5 are reserved circumferentially on the outer side of the vertical part of the prefabricated unit corbel column 203.

[0055] Several vertical anchor cable assemblies penetrating the prefabricated unit rib beam 202 are arranged radially inside the prefabricated unit rib beam 202 (i.e., between the two bottom sides of the right-angled trapezoidal prefabricated unit rib beam 202), and the vertical anchor cable assemblies include: vertical anchor cable holes 6, vertical anchor cables 12, and anchoring agents; several vertical anchor cable holes 6 are arranged radially inside the prefabricated unit rib beam 202 for the vertical anchor cables 12 to pass through. In this example, three vertical anchor cable holes 6 are reserved radially inside the prefabricated unit rib beam 202. The lower part of the vertical anchor cable 12 is embedded in the foundation rock layer, and the upper part is located in the vertical anchor cable hole 6 of the prefabricated structural component, and exceeds the set length of the top surface of the prefabricated unit rib beam 202; the vertical anchor cable hole 6 and the vertical anchor cable 12 are filled with anchoring agents. The vertical anchor cable assembly connects the assembled foundation to the ground, which improves the foundation's anti-overturning performance, helps to optimize and reduce the foundation's diameter, miniaturizes prefabricated structural components, and improves the site adaptability of the assembled foundation.

[0056] As an example, the vertical anchor cable 12 is an anchor steel bar.

[0057] The horizontal part of the prefabricated unit bracket column 203 is reserved with a vertical through-going tower prestressed cable channel 8, and a steel pipe and anchor plate are pre-buried; the prestressed cable channel 8 is used for the tower prestressed cable to pass through and tension and anchor. The tower prestressed cable channel 8 is connected to the cavity 4, which facilitates the tensioning construction of the tower structure prestressed cable.

[0058] In addition, a tower bottom ring section groove 9 and a cover plate groove 10 are reserved on the horizontal surface of the prefabricated unit corbel column 203; the tower bottom ring section groove 9 is used to connect the concrete tower bottom ring section, and the cover plate groove 10 is used to place the foundation top cover plate.

[0059] The annular prestressed cable 11 passes through the annular cable channel 5 and is tensioned tightly, so that the annular assembly structure composed of the prefabricated structural members 2 is fastened and fixed and connected as a whole. The vertical anchor cable 12 is passed through the vertical anchor cable hole 6, and the lower end of the vertical anchor cable 12 is embedded in the rock layer at the bottom of the foundation. An anchoring agent is filled between the vertical anchor cable 12 and the vertical anchor cable hole 6. The vertical anchor cable 12 makes the foundation and the foundation have better embedding, increases the pull-out bearing capacity of the foundation, improves the overall anti-overturning ability of the foundation, is conducive to optimizing and reducing the diameter of the foundation, and enhances the site adaptability of the assembled foundation.

[0060] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made on the basis of the present invention. Therefore, these modifications or improvements made on the basis of not departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A wind power tower assembly foundation, characterized in that: include: A cast-in-place central base plate (1) and a plurality of prefabricated structural members (2); the plurality of prefabricated structural members (2) are connected in sequence along the circumferential direction to form an annular assembly structure; The bottom of the central area of ​​the annular assembly structure is cast to form a cast-in-place central bottom plate (1); The embedded part (101) of the cast-in-place central base plate (1) is embedded downward in the foundation, and the raised part (102) extends into the interior of the annular assembly structure; The annular assembly structure is connected to the cast-in-place central base plate (1) via a plurality of dowel bars (3); The annular assembly structure is provided with a plurality of annular tensioning components along the circumferential direction, and a plurality of vertical anchor cable components are arranged inside.

2. The wind power tower assembly foundation according to claim 1, characterized in that: The prefabricated structural member (2) comprises: a prefabricated unit bottom plate (201), a prefabricated unit rib beam (202) and a prefabricated unit corbel column (203); The prefabricated unit bottom plate (201) is fan-shaped; the prefabricated unit rib beam (202) is arranged vertically to the central axis of the fan-shaped prefabricated unit bottom plate (201); the prefabricated unit rib beam (202) is arranged with a variable beam height, and the beam height decreases from the inside to the outside along the radial direction; The prefabricated unit corbel column (203) comprises a vertical portion and a horizontal portion extending inwardly from the upper end of the vertical portion; the inner sides of the prefabricated unit bottom plate (201) and the prefabricated unit rib beam (202) are connected to the outer sides of the vertical portion of the prefabricated unit corbel column (203).

3. The wind power tower assembly foundation according to claim 2, characterized in that: The outer ends of the prefabricated unit rib beams (202) protrude from the outer circumferential surface of the prefabricated unit bottom plate (201), so that the outer edge of the formed annular assembly structure is gear-shaped.

4. The wind power hybrid tower assembled foundation according to claim 2 or 3, characterized in that: A circumferential tensioning assembly is arranged on the outer side of the prefabricated unit corbel column (203); The annular tensioning assembly comprises: annular cable holes (5), annular prestressed cables (11) and a tensioning anchor assembly; annular cable holes (5) are reserved circumferentially on the outer side of the vertical part of the prefabricated unit corbel column (203), and the annular prestressed cables (11) are passed through each annular cable hole (5); and both ends of the annular prestressed cables (11) are tensioned tightly by the tensioning anchor assembly.

5. The wind power hybrid tower assembled foundation according to claim 2 or 3, characterized in that: A plurality of vertical anchor cable assemblies penetrating the prefabricated unit rib beam (202) are radially arranged inside the prefabricated unit rib beam (202); The vertical anchor cable assembly comprises: a vertical anchor cable hole (6), a vertical anchor cable (12) and an anchoring agent; a plurality of vertical anchor cable holes (6) are radially arranged inside the prefabricated unit rib beam (202) for allowing the vertical anchor cable (12) to pass through; the lower portion of the vertical anchor cable (12) is embedded in the foundation, and the upper portion passes through the prefabricated unit rib beam (202) and exceeds the top surface of the prefabricated unit rib beam (202) by a set length; the anchoring agent is filled between the vertical anchor cable hole (6) and the vertical anchor cable (12).

6. The wind power hybrid tower assembled foundation according to claim 5, characterized in that: The vertical anchor cable (12) is an anchoring steel bar.

7. The wind power hybrid tower assembled foundation according to claim 1, 2 or 3, characterized in that: Adjacent prefabricated structural members (2) are connected by grouting with U-shaped ribs.

8. The wind power hybrid tower assembled foundation according to claim 2 or 3, characterized in that: The horizontal part of the prefabricated unit corbel column (203) is reserved with a vertically penetrating tower prestressed cable channel (8), and a steel pipe and an anchor plate are pre-buried; The prestressed cable channel (8) is used for passing the tower prestressed cables through and tensioning and anchoring them; The tower prestressed cable channel (8) is in communication with the cavity (4), and the cavity (4) is an area surrounded by the annular assembly structure and the cast-in-place central bottom plate (1).

9. The wind power hybrid tower assembled foundation according to claim 2 or 3, characterized in that: The horizontal surface of the prefabricated unit corbel column (203) is reserved with a tower bottom ring section groove (9) and a cover plate groove (10); the tower bottom ring section groove (9) is used to connect the concrete tower bottom ring section, and the cover plate groove (10) is used to place the foundation top cover plate.

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