CN114382657A

CN114382657A - Combined tower, tower foundation and wind generating set

Info

Publication number: CN114382657A
Application number: CN202210074190.6A
Authority: CN
Inventors: 齐涛; 李荣富; 冀卫东
Original assignee: Jiangsu Goldwind Science and Technology Co Ltd
Current assignee: Jiangsu Goldwind Science and Technology Co Ltd
Priority date: 2022-01-21
Filing date: 2022-01-21
Publication date: 2022-04-22
Anticipated expiration: 2042-01-21
Also published as: CN114382657B

Abstract

The embodiment of the application discloses and provides a combined tower, a tower foundation and a wind driven generator unit, wherein a first tower part of the combined tower comprises an inner pipe positioned on the inner side and an outer pipe positioned on the outer side, and the inner pipe and the outer pipe are both made of fiber composite reinforced materials; an annular cavity is formed between the inner pipe and the outer pipe, and concrete is filled in the annular cavity; at least one end of the inner pipe and the outer pipe is a connecting end, and a first connecting piece is embedded in the connecting end. The concrete is restrained by the outer pipe and the inner pipe which are made of the fiber composite reinforced material, so that the strength of the concrete can be improved, and the fiber composite reinforced concrete has the advantage of low cost. In addition, the outer tube made of the fiber composite reinforced material can resist corrosion of the external marine environment. And utilize outer tube and the inner tube that fibre composite reinforcement made as the pre-buried basis of first connecting piece to set up first connecting piece reliably in the material that intensity is higher, ensure the reliability that first connecting piece is connected with other parts.

Description

Combined tower, tower foundation and wind generating set

Technical Field

The invention relates to the technical field of towers, in particular to a combined tower, a tower foundation and a wind generating set.

Background

At present, a tower for wind power generation is generally in a steel cylinder shape, and taking a mainstream structure of an offshore wind power tower as an example, the tower is formed into a section of about 30 meters by a steel cylinder body and a steel flange, and is connected through a high-strength bolt on a construction site. With the development of offshore wind power to the deep open sea, the tower made of the steel cylinder is heavier and heavier, and the cost is higher and higher. For this reason, there are composite towers, which are formed by filling concrete between an outer pipe and an inner pipe made of steel, but in this way, the outer pipe and the inner pipe of steel still have a heavy weight.

Disclosure of Invention

The embodiment of the application provides a combined tower, which comprises a first tower part, a second tower part and a third tower part, wherein the first tower part comprises an inner pipe positioned on the inner side and an outer pipe positioned on the outer side, and the inner pipe and the outer pipe are both made of fiber composite reinforced materials; an annular cavity is formed between the inner pipe and the outer pipe, and concrete is filled in the annular cavity; at least one end of the inner pipe and the outer pipe is a connecting end, and a first connecting piece is embedded in the connecting end.

In a specific embodiment, the inner and outer tubes comprise a main body segment, the connecting end portion is connected to one end of the main body segment, and the connecting end portion has a thickness greater than that of the main body segment.

In one embodiment, the connecting end portion and the main body segment are radiused.

In a particular embodiment, at least one of said inner pipe and said outer pipe is provided with stiffening ribs projecting towards said annular chamber.

In a specific embodiment, the inner pipe or the outer pipe is provided with a plurality of the stiffening ribs, and the stiffening ribs are distributed along the longitudinal direction and the circumferential direction of the combined tower.

In one embodiment, the outer tube has a thickness greater than a thickness of the inner tube.

In one embodiment, the first connecting member is a threaded rod or a sleeve provided with an internal thread.

In one embodiment, the outer surface of the sleeve has a texture.

In one embodiment, the tower further comprises a second tower part fixedly connected with the first connecting piece of one connecting end part of the first tower part through a second connecting piece; or, the combined tower further comprises a conversion section, the conversion section is fixedly connected with the first connecting piece at the connecting end part of the first tower part through a second connecting piece, and the second tower part is fixedly connected with the conversion section.

In one embodiment, the first connecting piece is a screw or a sleeve provided with an internal thread; the second connecting piece is a nut matched with the screw rod, or the second connecting piece is a bolt matched with the sleeve, or the second connecting piece comprises a stud and a nut, and two ends of the stud are respectively matched with the sleeve and the nut.

In one embodiment, the transition section is tapered.

The embodiment of the application also provides a tower foundation, which comprises a foundation and the combined tower described in any one of the above;

the foundation is fixedly connected with the first connecting piece at one connecting end part of the combined tower through a third connecting piece; or, the tower foundation further comprises a conversion section, the conversion section is fixedly connected with the first connecting piece at the connecting end part of the combined tower through a second connecting piece, and the foundation is fixedly connected with the conversion section.

The embodiment of the application also provides a wind generating set, which comprises the tower foundation.

The main structure of the combined tower in the embodiment of the application is a combined structure which is characterized in that an inner pipe and an outer pipe are made of fiber composite reinforced materials with certain strength, and concrete is used as a sandwich layer. Therefore, the concrete is restrained by the outer pipe and the inner pipe which are made of the fiber composite reinforced material, the strength of the concrete can be improved, and the bearing capacity of the concrete is improved. Moreover, compared with steel materials in the background art, the fiber composite reinforced material has the advantage of lower cost. In addition, the fiber composite reinforced material has better anti-corrosion capability, and the outer pipe made of the fiber composite reinforced material can resist the corrosion of the external marine environment. In addition, the outer pipe and the inner pipe which are made of the fiber composite reinforced material are used as the pre-buried foundation of the first connecting piece, so that the first connecting piece is reliably arranged in the material with higher strength, and the reliability of connection between the first connecting piece and other parts is guaranteed.

Drawings

FIG. 1 is a schematic illustration of a tower foundation provided in accordance with a first embodiment of the present application;

FIG. 2 is an axial cross-sectional view of FIG. 1;

FIG. 3 is an enlarged view of portion B of FIG. 2;

FIG. 4 is an enlarged view of portion A of FIG. 2;

FIG. 5 is an enlarged view of the portion C in FIG. 2;

FIG. 6 is a transverse cross-sectional view of FIG. 1;

FIG. 7 is an enlarged view of portion D of FIG. 6;

FIG. 8 is a perspective view of the modular tower of FIG. 1;

FIG. 9 is a schematic view of a tower foundation provided by a second embodiment of the present application;

fig. 10 is an enlarged view of a portion E in fig. 9.

The reference numerals in fig. 1-10 are illustrated as follows:

1-a first tower portion;

11-an outer tube; 111-a first external connection end; 112-a second outer connecting end; 113-an outer body section;

12-an inner tube; 121-a first inner connecting end; 122-a second inner connecting end; 123-inner body section;

13-concrete; 14-a screw; 15-a cannula;

1 a-a stiffener;

2-a steel tower; 21-T-shaped flange;

3-a base; a 31-T shaped flange;

4-a conversion section; a 41-L shaped flange; a 42-T shaped flange; 43-a barrel portion;

5-a stud; 6-a gasket; 7-nut.

Detailed Description

In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Example 1

Referring to fig. 1-3, fig. 1 is a schematic view of a tower foundation according to a first embodiment of the present application; FIG. 2 is an axial cross-sectional view of FIG. 1; fig. 3 is an enlarged view of a portion B in fig. 2.

In this embodiment, a tower foundation is provided, which may serve as a support structure for a wind power plant, which may be onshore or offshore, and which includes a tower and a foundation, the tower being generally onshore or offshore, and the foundation being generally underground or underwater, although this is not a limitation. In this embodiment, the tower of the tower foundation is a combined tower, the combined tower includes a first tower portion 1, the first tower portion 1 includes an inner pipe 12 located inside and an outer pipe 11 located outside, the inner pipe 12 and the outer pipe 11 are both made of FRP (Fiber Reinforced Polymer) material, and the Fiber Reinforced composite material has high strength. In addition, the inner pipe 12 and the outer pipe 11 are arranged at intervals, so that an annular cavity can be formed between the inner pipe 12 and the outer pipe 11, concrete 13 is filled in the annular cavity, the concrete 13 can be self-compacting micro-expansion concrete 13, and the grade of the selected concrete 13 can be C50-C80. When the first tower portion 1 is manufactured, the outer pipe 11 and the inner pipe 12 may be placed in advance to serve as a casting form, and the concrete 13 may be cast into an annular cavity enclosed by the outer pipe 11 and the inner pipe 12, thereby integrating the outer pipe 11, the inner pipe 12, and the concrete 13.

It can be seen that the main structure of the first tower portion 1 in the embodiment of the present application is a combined structure in which the inner pipe 12 and the outer pipe 11 are made of fiber composite reinforced material with certain strength and the concrete 13 is sandwiched, that is, the first tower portion 1 is a three-layer sandwich structure. Thus, the outer pipe 11 and the inner pipe 12 made of the fiber composite reinforced material restrain the concrete 13, so that the strength of the concrete 13 can be improved, and the bearing capacity of the concrete 13 can be improved. Moreover, compared with steel materials in the background art, the fiber composite reinforced material has the advantage of lower cost. In addition, the fiber composite reinforced material has better corrosion resistance, the outer pipe 11 made of the fiber composite reinforced material can resist corrosion of the external marine environment, and in order to better exert the advantage of corrosion resistance, the thickness of the outer pipe 11 can be further set to be larger than that of the inner pipe 12.

In addition, please refer to fig. 4 and 5, wherein fig. 4 is an enlarged view of a portion a in fig. 2; fig. 5 is an enlarged view of a portion C in fig. 2.

The inner tube 12 and the outer tube 11 of the first tower portion 1 comprise a body section and end portions at both ends of the body section, the end portions being provided as connection end portions, the body section and the connection end portions being of unitary construction, the divisions being made here for ease of understanding. Specifically, it is possible to define that the two connection end portions of the outer pipe 11 are a first outer connection end portion 111 and a second outer connection end portion 112, respectively, and the two connection end portions of the inner pipe 12 are a first inner connection end portion 121 and a second inner connection end portion 122, respectively, and in fig. 2, the first outer connection end portion 111 and the first inner connection end portion 121 are located at the upper end of the first tower portion 1, and the second outer connection end portion 112 and the second inner connection end portion 122 are located at the lower end of the first tower portion 1. The first connecting piece can be embedded in the connecting end part.

Thus, the first tower section 1 may be connected to other components connected thereto, such as a nacelle, by means of pre-embedded first connecting elements, in which case the first tower section 1 constitutes the entire tower, or the combined tower may also comprise other sections assembled with the first tower section 1, and the first tower section 1 may further comprise a second tower section, such as a steel tower 2 as shown in fig. 1, or the combined tower may comprise a plurality of first tower sections 1 assembled together, and the first connecting elements of the first tower section 1 may be used for connecting to other first tower sections 1. Therefore, in the embodiment, the outer pipe 11 and the inner pipe 12 made of the fiber composite reinforced material are used as the pre-buried foundation of the first connecting piece, so that the first connecting piece is reliably arranged in the material with higher strength, and the reliability of connection between the first connecting piece and other parts is guaranteed.

Moreover, inner tube 12 and outer tube 11 all are equipped with pre-buried first connecting piece, can satisfy higher joint strength demand to be favorable to bearing load uniformly after establishing the connection like this, avoid eccentric load, certainly, under the prerequisite that joint strength satisfies the requirement, only pre-buried first connecting piece in inner tube 12, perhaps only pre-buried first connecting piece in outer tube 11 also can. When the first connecting piece is embedded, the first connecting piece can be evenly embedded along the circumferential direction of the inner pipe 12 and the outer pipe 11.

Specifically, fig. 4 illustrates a first outer connection end 111 of the outer tube 11 and a first inner connection end 121 of the inner tube 12, where the first connection members pre-embedded in the first outer connection end 111 and the first inner connection end 121 are both screws 14, and the second connection member matched with the screws 14 is nuts 7. As will be understood from fig. 1, the steel tower 2 is connected to the upper end of the first tower portion 1, the steel tower 2 includes a cylindrical portion, a T-shaped flange 21 is provided at the lower end of the cylindrical portion, and the T-shaped flange 21 and the cylindrical portion are of an integral structure.

The T-shaped flange 21 is divided into an inner part and an outer part by the tube part, as shown in fig. 4, when the first tower part 1 and the steel tower 2 are installed, the steel tower 2 can be erected above the first tower part 1, the first outer connecting end part 111 and the first inner connecting end part 121 of the first tower part 1 are embedded with the screw 14 extending out of the upper end surface of the first tower part 1, the screw 14 can be inserted into the flange hole of the T-shaped flange 21, specifically, the screw 14 embedded in the first outer connecting end part 111 is inserted into the flange hole of the outer part of the T-shaped flange 21 and penetrates out, the screw 14 embedded in the first inner connecting end part 121 is inserted into the flange hole of the inner part of the T-shaped flange 21 and penetrates out, and the penetrating part is in threaded connection with the nut 7, thereby locking the T-shaped flange 21. A gasket 6 may be arranged between the T-flange 21 and the nut 7 to protect the T-flange 21 and the nut 6 and to increase the contact area and avoid loosening, and a gasket may also be arranged between the T-flange 21 and the entire end surface of the first tower portion 1.

As shown in fig. 4, the axial cross section of the embedded screw 14 is T-shaped, that is, the screw 14 includes a head portion and a threaded rod portion, the transverse dimension of the head portion is greater than that of the threaded rod portion, and the threaded rod portion extends out of the corresponding connection end portion, so that the head portion can limit the threaded rod portion to be separated from the connection end portion, and the embedded reliability of the screw 14 is improved. In the manufacturing process, the screw 14 may be prepared, the screw 14 may be used as a core mold or a part of a core mold, and the fiber composite reinforcement may be integrated with the screw 14 by winding, laying, or the like.

Referring again to fig. 5, the first tower portion 1 is mounted on the upper end of a foundation 3, which foundation 3 may be a steel frame, and in particular, the foundation 3 is a truss structure such as a jacket, a mono-pile structure, or the like. The upper end of the foundation 3 is also provided with a T-shaped flange 31, the first connecting pieces pre-embedded in the second outer connecting end portion 112 and the second inner connecting end portion 122 at the lower end of the first tower portion 1 are also screw rods 14, and are connected with the foundation 3 through third connecting pieces, and the third connecting pieces are understood by referring to the second connecting pieces, that is, the connecting mode between the screw rods 14 and the T-shaped flange 31 of the foundation 3 is understood by referring to the connecting mode with the steel tower 2, and no further description is given. It can be known that the steel tower 2 and the foundation 3 may not be provided with T-shaped flanges, for example, L-shaped flanges, and the connection strength requirement may be satisfied. Certainly, the T-shaped flange is matched with the embedded first connecting piece at the inner connecting end part and the outer connecting end part, and the stress is balanced.

As shown in fig. 2, the inner tube 12 and the outer tube 11 each include a main body section defined as an inner main body section 123 and an outer main body section 113, respectively, a first inner connecting end portion 121 and a second inner connecting end portion 122 respectively connected to both ends of the inner main body section 123, and a first outer connecting end portion 111 and a second outer connecting end portion 112 respectively connected to both ends of the outer main body section 113. In the embodiment of the present application, the thickness of the connecting end portion is greater than that of the main body segment, that is, the outer pipe 11 and the inner pipe 12 are locally thickened at the end portion, so that a sufficient space can be provided to pre-embed the first connecting member.

As shown in fig. 2 and 5, the connecting end portions of the outer pipe 11 and the inner pipe 12 and the corresponding main body section have different thicknesses, and the connecting position a forms a step, and in the embodiment of the present invention, the connecting position a adopts an arc transition, so that the stress concentration can be reduced.

With continued reference to fig. 6-8, fig. 6 is a transverse cross-sectional view of fig. 1, the transverse direction being a direction perpendicular to the axial direction of the first tower portion 1; FIG. 7 is an enlarged view of portion D of FIG. 6; fig. 8 is a perspective view of the first tower part 1 of fig. 1.

In the present embodiment, at least one of the inner pipe 12 and the outer pipe 11 may be provided with a stiffening rib 1a projecting towards the annular chamber, and in fig. 7, both the inner pipe 12 and the outer pipe 11 are provided with a stiffening rib 1 a. The stiffeners 1a and the corresponding inner and

outer pipes

12, 11 may be of a unitary structure. The provision of the reinforcing ribs 1a can increase the adhesion between the concrete 13 and the inner pipe 12 or the outer pipe 11.

As shown in fig. 8, the inner pipe 12 and the outer pipe 11 are each provided with a plurality of reinforcing ribs 1a, and the plurality of reinforcing ribs 1a may be distributed in the longitudinal direction and the circumferential direction of the first tower portion 1. The longitudinal distance value of two stiffening ribs 1a adjacent in the longitudinal direction can be 1000mm, the circumferential distance can be 60 degrees, namely the angle of the central angle corresponding to the arc length between two stiffening ribs 1a adjacent in the circumferential direction is 60 degrees, and two circles of stiffening ribs 1a adjacent in the upper and lower directions are arranged in a staggered mode in the circumferential direction. Of course, the above values are merely examples, and the specific number of the stiffeners 1a may be referred to as positions according to the adhesive force requirement to the concrete 13. As shown in fig. 7, the cross-sectional structure of the stiffening rib 1a in the transverse direction may be rectangular, and specifically, the dimension may be 100mm in length in the radial direction and 20mm in width in the circumferential direction, and the stiffening rib 1a is formed integrally with the inner pipe 12 and the outer pipe 11, and is also made of a fiber composite reinforcing material.

Example 2

Referring to fig. 9 and 10, fig. 9 is a schematic view of a tower foundation provided in a second embodiment of the present application, in which a combined tower of the tower foundation includes a first tower portion 1 and a transition section 4, only an upper portion of the first tower portion 1 is shown; fig. 10 is an enlarged view of a portion E in fig. 9.

The first tower portion 1 in this embodiment is the same as the first embodiment, except that the first embedded connecting member is different, the first embedded connecting member in this embodiment is a sleeve 15, the sleeve 15 is provided with an internal thread, and the second connecting member or the third connecting member matched with the sleeve 15 includes a stud 5 and a nut 7, so that a threaded connection is established with other components through the sleeve 15, the stud 5 and the nut 7.

In order to further improve the reliability of embedding the sleeve 15, the outer surface of the sleeve 15 may be provided with a texture, for example, a special-shaped thread, or any other type of texture may be provided, as long as the outer surface of the sleeve 15 is formed with regularly distributed protrusions or irregularly distributed protrusions, the reliability of embedded connection may be improved, so that the sleeve 15 may be better bonded with the fiber composite reinforcement material of the inner tube 12 or the outer tube 11.

In addition, unlike the composite tower of embodiment 1, the first tower portion 1 in this example is not directly connected to the steel tower 2, but is connected to the transition section 4, and the transition section 4 is connected to the steel tower 2, and the transition section 4 may be of a steel structure. As shown in fig. 10, the transition section 4 includes a cylindrical portion 43, and one end of the cylindrical portion 43 facing the outer pipe 11 and the inner pipe 12 is provided as a T-shaped flange 42. The T-shaped flange 42 is divided into an inner part and an outer part by taking the cylinder part 43 of the conversion section 4 as a boundary, the stud 5 can downwards pass through a flange hole on the inner side of the T-shaped flange 42 and be inserted into the sleeve 15 pre-embedded at the first inner connecting end part 121, the sleeve 15 is fastened with the thread of the sleeve, and the matched nut 7 is screwed at the upper end of the stud 5, namely the stud 5 is a double-end stud, so that the two ends of the stud are conveniently screwed, and the second connecting piece matched with the sleeve 15 can also be a bolt; similarly, the stud 5 may be inserted downward through the flange hole on the outer side of the T-shaped flange 42 and into the pre-embedded sleeve 15 of the first outer connecting end 111 for threaded connection, and then the mating nut 7 may be screwed onto the upper end of the stud 5. That is, the conversion section 4 is connected to the first tower portion 1, and similarly to the connection between the first tower portion 1 and the steel tower 2 in embodiment 1, the conversion section 4 is provided at an upper end thereof with an L-shaped flange 41 that is connectable to a flange at the bottom of the steel tower 2, thereby performing a function of engaging the first tower portion 1 with the steel tower 2.

In addition, the stud 5 can be tensioned by means of a tensioner before being connected to the internally threaded sleeve 15, in order to obtain a suitable pretensioning force.

In the same way as in embodiment 1, the lower end of the first tower part 1 in this embodiment may be connected to the foundation 3, and may also be connected to the foundation 3 by means of the transition section 4, i.e. the lower end of the first tower part 1 may also be provided with the transition section 4 in the connection manner as described in fig. 9.

The conversion sections 4 in the embodiment can be in a straight cylinder shape or a conical shape, and the conversion sections 4 with different conical degrees can be matched with steel towers 2 or foundations 3 with different diameters, so that the assembly of the tower foundation is more flexible.

The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. The combined tower is characterized by comprising a first tower part, wherein the first tower part comprises an inner pipe positioned on the inner side and an outer pipe positioned on the outer side, and the inner pipe and the outer pipe are both made of fiber composite reinforced materials; an annular cavity is formed between the inner pipe and the outer pipe, and concrete is filled in the annular cavity; at least one end of the inner pipe and the outer pipe is a connecting end, and a first connecting piece is embedded in the connecting end.

2. The modular tower of claim 1 wherein the inner and outer tubes comprise a main body segment, the connecting end portion being connected to one end of the main body segment, the connecting end portion having a thickness greater than a thickness of the main body segment.

3. The modular tower of claim 2 wherein said connecting end and said main body segment are radiused.

4. A modular tower as claimed in claim 1 in which at least one of the inner and outer tubes is provided with stiffening ribs projecting towards the annular cavity.

5. A modular tower as claimed in claim 4, in which said inner or outer tube is provided with a plurality of said stiffening ribs distributed longitudinally and circumferentially of said modular tower.

6. The modular tower of claim 1 wherein the outer tube has a thickness greater than a thickness of the inner tube.

7. A modular tower as claimed in any one of claims 1 to 6 in which the first connection member is a threaded rod or a sleeve provided with an internal thread.

8. The modular tower of claim 7 wherein the outer surface of said sleeve is textured.

9. A modular tower as claimed in any one of claims 1 to 6, further comprising a second tower section fixedly connected to said first connecting member of said one said connecting end portion of said first tower section by a second connecting member; or, the combined tower further comprises a conversion section, the conversion section is fixedly connected with the first connecting piece at the connecting end part of the first tower part through a second connecting piece, and the second tower part is fixedly connected with the conversion section.

10. The modular tower of claim 9 wherein said first connector is a threaded rod or a sleeve with internal threads; the second connecting piece is a nut matched with the screw rod, or the second connecting piece is a bolt matched with the sleeve, or the second connecting piece comprises a stud and a nut, and two ends of the stud are respectively matched with the sleeve and the nut.

11. The modular tower of claim 10 wherein said transition section is tapered.

12. A tower foundation comprising a foundation and a composite tower according to any one of claims 1 to 11;

the foundation is fixedly connected with the first connecting piece at one connecting end part of the combined tower through a third connecting piece; or, the tower foundation further comprises a conversion section, the conversion section is fixedly connected with the first connecting piece at the connecting end part of the combined tower through a third connecting piece, and the foundation is fixedly connected with the conversion section.

13. A wind park comprising a tower foundation according to claim 12.