A truss-combined steel-concrete cylindrical wind power foundation

Abstract

The present invention discloses a truss-combined steel-concrete cylindrical wind power foundation, which includes a steel-concrete cylinder skirt; above the steel-concrete cylinder skirt, a reinforced concrete beam system structure is cast and provided; at the top center position of the reinforced concrete beam system structure, a vertically distributed steel-concrete vertical transition section is fixedly connected; the top of the steel-concrete vertical transition section is connected to the bottom of the steel vertical transition section; the steel-concrete vertical transition section and the steel vertical transition section are hollow cylindrical structures with a truss structure built therein; the top of the steel-concrete vertical transition section is open; both the upper and lower ends of the steel vertical transition section are open; the central points of the steel-concrete cylinder skirt, the steel-concrete vertical transition section, the steel vertical transition section and the truss are located on the same central axis. The truss-combined steel-concrete cylindrical wind power foundation disclosed by the present invention can meet the installation requirements of large-megawatt wind turbines in deep water areas, and has relatively high flexural stiffness and good anti-overturning ability.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power foundation structures, and particularly to a truss-combined steel-concrete cylindrical wind power foundation. Background Art

[0002] Wind energy is an inexhaustible and renewable clean energy source. Compared with traditional fossil fuels, wind energy is clean to use and has a lower cost, with advantages such as a wide development range, safety, and never-depleting energy. Compared with onshore wind power, offshore wind power has advantages such as high wind speed, low turbulence intensity, and no occupation of arable land.

[0003] Modern wind turbines mainly include a wind power foundation, a tower barrel arranged on the upper part of the wind power foundation, and a wind turbine at the top. The key to ensuring the safe and normal operation of the wind turbine lies in: the wind power foundation that supports the wind turbine. The wind power foundation generally includes a foundation structure below the tower barrel for supporting the tower barrel and the wind turbine;

[0004] At present, pile foundations or composite pile foundations are mostly used for offshore wind power foundations in China. They have simple designs and mature installation processes. However, they are subject to large horizontal deformations under lateral loads (wind, waves, and currents).

[0005] With the strong support of the state for offshore wind power, the development of offshore wind power in China has entered the fast lane. At present, the development of wind energy resources in the near-shore area has tended to be saturated. To achieve higher output, future offshore wind power will surely develop towards deep water and large capacity. When installing large-megawatt (e.g., installed capacity greater than 8 MW) wind turbines in deep water areas (e.g., water depth exceeding 40 m), it is required that the offshore wind power foundation has a large bearing capacity and higher requirements are put forward for the load transfer method of the structure.

[0006] However, for traditional offshore wind power foundations, they cannot meet the installation requirements for large-megawatt (e.g., installed capacity greater than 8 MW) wind turbines in deep water areas (e.g., water depth exceeding 40 m). Under the installation conditions of deep water areas (e.g., water depth exceeding 40 m) and large-megawatt (e.g., installed capacity greater than 8 MW) wind turbines, there are problems such as insufficient flexural stiffness and insufficient anti-overturning ability.

[0007] Therefore, there is an urgent need to develop a technical solution at present to solve the above problems. Summary of the Invention

[0008] The purpose of the present invention is to provide a truss-combined steel-concrete cylindrical wind power foundation in view of the technical defects existing in the prior art.

[0009] To this end, the present invention provides a truss-combined steel-concrete cylindrical wind power foundation, which includes a horizontally placed steel-concrete cylinder skirt;

[0010] Above the ladle concrete cylindrical skirt, a reinforced concrete beam system structure is cast and provided.

[0011] At the top center position of the reinforced concrete beam system structure, a vertically distributed ladle concrete vertical transition section is fixedly connected.

[0012] The top of the ladle concrete vertical transition section is connected to the bottom of the steel vertical transition section.

[0013] Among them, the ladle concrete vertical transition section and the steel vertical transition section are hollow cylindrical structures.

[0014] The top of the ladle concrete vertical transition section is open.

[0015] Both the upper and lower ends of the steel vertical transition section are open.

[0016] The top of the ladle concrete vertical transition section is communicated with the bottom of the steel vertical transition section.

[0017] The central points of the ladle concrete cylindrical skirt, the ladle concrete vertical transition section, and the steel vertical transition section are located on the same central axis.

[0018] Preferably, the ladle concrete cylindrical skirt includes a ladle concrete cylindrical skirt main body with a hollow interior and a regular hexagonal prism shape.

[0019] The ladle concrete cylindrical skirt main body is a concrete main body made by casting concrete.

[0020] Both the inner and outer surface of the ladle concrete cylindrical skirt main body are wrapped with steel shells.

[0021] The steel shell located at the top of the ladle concrete cylindrical skirt main body is welded to a horizontally distributed support steel plate.

[0022] Preferably, a plurality of inner partition plates of the cylindrical skirt are fixedly arranged inside the ladle concrete cylindrical skirt.

[0023] The plurality of inner partition plates of the cylindrical skirt are used to divide the ladle concrete cylindrical skirt into a plurality of hollow compartments in a honeycomb shape.

[0024] Among them, the inner partition plates of the cylindrical skirt are steel plates, and they are welded to the steel shell on the inner side of the bottom of the ladle concrete cylindrical skirt main body.

[0025] For the ladle concrete cylindrical skirt, the bottom surface of the support steel plate is welded to the top of the inner partition plates of the cylindrical skirt.

[0026] Among them, a circular upwardly protruding steel baffle is welded around the top four edges of the support steel plate.

[0027] The reinforced concrete beam system structure is cast inside the steel baffle.

[0028] Preferably, the ladle concrete vertical transition section is cylindrical as a whole and includes a ladle concrete vertical transition section main body with a hollow interior.

[0029] The ladle concrete vertical transition section main body is a concrete main body made by pouring concrete.

[0030] Steel shells are fixedly wrapped on the inner and outer surfaces of the concrete side walls around the ladle concrete vertical transition section main body.

[0031] The whole of the steel vertical transition section is a cylindrical steel structure.

[0032] A flange is welded to the bottom of the steel vertical transition section, and a flange is welded to the top of the ladle concrete vertical transition section.

[0033] The flange at the bottom of the steel vertical transition section and the flange at the top of the ladle concrete vertical transition section are fixedly connected by a plurality of bolts passing through the through holes on the flanges correspondingly.

[0034] Preferably, the reinforced concrete beam system structure includes a reinforced structure arranged in a concrete main body in the shape of a regular hexagonal prism.

[0035] The reinforced structure includes a plurality of prestressed steel bars and a steel mesh.

[0036] The top of the supporting steel plate is welded to the steel mesh embedded in the reinforced concrete beam system structure.

[0037] Preferably, steel internal trusses are vertically installed in the inner cavities of the ladle concrete vertical transition section and the steel vertical transition section.

[0038] The whole of the steel internal trusses is a steel structure.

[0039] Among them, the lower part of the steel internal truss is welded to the steel shell on the inner side of the concrete side wall around the ladle concrete vertical transition section.

[0040] The middle and upper parts of the steel internal truss are welded to the inner side of the steel vertical transition section.

[0041] Preferably, steel external trusses are installed around the outer walls of the ladle concrete vertical transition section and the steel vertical transition section.

[0042] The whole of the steel external trusses is a steel structure.

[0043] The central point of the steel external truss and the central points of the ladle concrete vertical transition section and the steel vertical transition section are located on the same central axis.

[0044] Among them, the upper part of the steel external truss is welded to the lower outer wall of the steel vertical transition section.

[0045] The middle and lower parts of the steel outer truss are welded to the steel shell on the outer side of the concrete side walls around the steel - contained concrete vertical transition section;

[0046] The bottom of the steel outer truss is welded to the steel bar structure arranged inside the concrete main body of the reinforced concrete beam system structure.

[0047] Preferably, in the inner cavities of the steel - contained concrete vertical transition section and the steel vertical transition section, steel inner trusses vertically distributed are installed;

[0048] Around the outer walls of the steel - contained concrete vertical transition section and the steel vertical transition section, steel outer trusses are installed;

[0049] The whole of the steel inner truss and the steel outer truss is of steel structure;

[0050] The center point of the steel outer truss, the center points of the steel - contained concrete vertical transition section and the steel vertical transition section are located on the same central axis;

[0051] The bottom of the steel outer truss is welded to the steel bar structure arranged inside the concrete main body of the reinforced concrete beam system structure.

[0052] Preferably, in the inner cavities of the steel - contained concrete vertical transition section and the steel vertical transition section, steel inner trusses vertically distributed are installed;

[0053] The whole of the steel inner truss is of steel structure;

[0054] The steel shells on the outer side of the upper part of the steel - contained concrete vertical transition section are respectively welded to the tops of multiple steel - contained concrete inclined support beams at equal intervals;

[0055] The steel - contained concrete inclined support beam includes a hollow steel pipe, and concrete is poured inside the steel pipe, filling the inner cavity of the steel pipe;

[0056] The bottoms of the steel - contained concrete inclined support beams are respectively welded to the steel bar structures arranged inside the concrete main body of the reinforced concrete beam system structure at equal intervals;

[0057] The steel - contained concrete inclined support beam is inclined, and the included angle between the middle main part of it and the horizontal plane is 30° - 75°.

[0058] Preferably, in the inner cavities of the steel - contained concrete vertical transition section and the steel vertical transition section, steel inner trusses vertically distributed are installed;

[0059] Around the outer walls of the steel - contained concrete vertical transition section and the steel vertical transition section, steel outer trusses are installed;

[0060] The whole of the steel inner truss and the steel outer truss is of steel structure;

[0061] The central point of the steel outer truss, the central points of the ladle concrete vertical transition section and the steel vertical transition section are located on the same central axis;

[0062] Among them, the steel shells on the outer sides of the upper parts of the ladle concrete vertical transition sections are respectively welded to the tops of multiple ladle concrete inclined support beams at equal intervals;

[0063] The ladle concrete inclined support beam includes a hollow steel pipe, and concrete is poured inside the steel pipe, and the internal cavity of the steel pipe is filled with concrete;

[0064] The bottoms of the ladle concrete inclined support beams are respectively welded to the steel bar structures arranged in the concrete main body of the reinforced concrete beam system at equal intervals.

[0065] As can be seen from the technical solutions provided by the present invention above, compared with the prior art, the present invention provides a truss combined steel-concrete cylindrical wind power foundation, which is scientifically designed, has a relatively high bending stiffness and good anti-overturning ability, can better meet the installation requirements of deep-water large-capacity wind turbines, and has great practical significance.

[0066] After inspection, by applying the present invention, it can meet the installation requirements of large-megawatt (for example, the installed capacity is greater than 8 MW) wind turbines in deep water areas (for example, the water depth exceeds 40 m). Brief Description of the Drawings

[0067] Figures 1a to 1b , respectively, are the front view and top view structural schematic diagrams of a truss combined steel-concrete cylindrical wind power foundation provided by the present invention when a steel inner truss is installed in Embodiment 1;

[0068] Figures 2a to 2b , respectively, are the front view and top view structural schematic diagrams of a truss combined steel-concrete cylindrical wind power foundation provided by the present invention when a steel outer truss is installed in Embodiment 2;

[0069] Figures 3a to 3b , respectively, are the front view and top view structural schematic diagrams of a truss combined steel-concrete cylindrical wind power foundation provided by the present invention when a steel outer truss and a steel inner truss are installed in Embodiment 3;

[0070] Figures 4a to 4b , respectively, are the front view and top view structural schematic diagrams of a truss combined steel-concrete cylindrical wind power foundation provided by the present invention when a steel inner truss and ladle concrete inclined support beams are installed in Embodiment 4;

[0071] Figures 5a to 5b, respectively, a front view and a top - down structural schematic diagram of a truss - combined steel - concrete cylindrical wind power foundation provided by the present invention when a steel inner truss, a steel outer truss, and a steel - wrapped concrete inclined support beam are installed in Embodiment Five;

[0072] Figure 6 In the truss - combined steel - concrete cylindrical wind power foundation provided by the present invention, it is a sectional view inside the steel - wrapped concrete barrel skirt. The sectional plates inside the barrel skirt divide the steel - wrapped concrete barrel skirt into seven honeycomb - shaped compartments;

[0073] In the figure: 1. Steel - wrapped concrete barrel skirt; 2. Sectional plate inside the barrel skirt; 3. Reinforced concrete beam system structure; 4. Steel - wrapped concrete inclined support beam; 5. Steel - wrapped concrete vertical transition section;

[0074] 6. Steel vertical transition section; 7. Steel inner truss; 8. Steel outer truss. Specific embodiments

[0075] To make the technical means achieved by the present invention easier to understand, the following further details the present application in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the relevant application, rather than limiting the application. Additionally, it should be noted that for the sake of description, only parts related to the present application are shown in the drawings.

[0076] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following will detail the present application with reference to the drawings and embodiments.

[0077] It should be noted that in the description of the present application, terms indicating directions or positional relationships such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation of the present application.

[0078] In addition, it should be noted that in the description of the present application, unless otherwise clearly specified and limited, terms such as "installation" should be understood in a broad sense. For example, it can be fixedly installed or detachably installed.

[0079] For those skilled in the art, the specific meanings of the above - mentioned terms in the present application can be understood according to specific circumstances.

[0080] See Figures 1a to 6 , the present invention provides a truss - combined steel - concrete cylindrical wind power foundation, including a horizontally placed steel - wrapped concrete barrel skirt 1;

[0081] Above the steel ladle concrete cylinder skirt 1, a reinforced concrete beam system structure 3 is cast and arranged;

[0082] At the top center position of the reinforced concrete beam system structure 3, a vertically distributed steel ladle concrete vertical transition section 5 is fixedly connected;

[0083] The top of the steel ladle concrete vertical transition section 5 is connected to the bottom of the steel vertical transition section 6;

[0084] Among them, the steel ladle concrete vertical transition section 5 and the steel vertical transition section 6 are hollow cylindrical structures;

[0085] The top of the steel ladle concrete vertical transition section 5 is open;

[0086] Both the upper and lower ends of the steel vertical transition section 6 are open;

[0087] The top of the steel ladle concrete vertical transition section 5 is in communication with the bottom of the steel vertical transition section 6;

[0088] The center points of the steel ladle concrete cylinder skirt 1, the steel ladle concrete vertical transition section 5, and the steel vertical transition section 6 are located on the same central axis.

[0089] It should be noted that in the present invention, the steel ladle concrete cylinder skirt 1, as the cylinder foundation part of the wind power foundation, is used to support the tower barrel; the steel ladle concrete vertical transition section 5 and the steel vertical transition section 6 together serve as the tower barrel part of the wind power foundation.

[0090] In the present invention, specifically, the cross-sectional shape of the steel ladle concrete cylinder skirt 1 is a regular hexagon.

[0091] In the present invention, specifically, the steel ladle concrete cylinder skirt 1 includes a steel ladle concrete cylinder skirt main body with a hollow interior and a regular hexagonal prism shape;

[0092] The steel ladle concrete cylinder skirt main body is a concrete main body made by casting concrete;

[0093] Both the inner and outer side surfaces of the steel ladle concrete cylinder skirt main body are wrapped with steel shells (i.e., steel cladding treatment is carried out), that is to say, all the exposed parts are steel clad, specifically including: the inner and outer side surfaces of the concrete side walls (i.e., concrete side walls) around the steel ladle concrete cylinder skirt main body and the inner and outer side surfaces of the bottom plate are fixedly wrapped with steel shells (i.e., steel cladding treatment is carried out);

[0094] The steel shell located at the top of the steel ladle concrete cylinder skirt main body is welded to a layer of horizontally distributed support steel plates.

[0095] It should be noted that the method of steel cladding treatment for concrete is a well-known method in the prior art and will not be elaborated here.

[0096] It should be noted that in terms of specific implementation, the height range of the ladle concrete cylinder skirt 1 is 16 - 24 m;

[0097] In the ladle concrete cylinder skirt main body, the wall thickness of the concrete is 0.3 - 0.4 m, and the thickness of the steel shell is 5 - 10 mm.

[0098] In the present invention, in terms of specific implementation, inside the ladle concrete cylinder skirt 1, a plurality of inner compartment plates 2 of the cylinder skirt are fixedly arranged;

[0099] It should be noted that the plurality of inner compartment plates 2 of the cylinder skirt are used to divide the ladle concrete cylinder skirt 1 serving as the cylinder foundation into a plurality of (for example, 7) hollow compartments in a honeycomb shape;

[0100] See Figure 1b and Figure 6 As shown, the plurality of compartments specifically include: a central compartment 21 with a regular hexagon cross-sectional shape, and six surrounding compartments 22 with equal cross-sectional areas distributed around the central compartment 21.

[0101] In terms of specific implementation, the inner compartment plates 2 of the cylinder skirt are steel plates, which are welded to the steel shell on the inner side of the bottom of the ladle concrete cylinder skirt main body. Among them, for the inner compartment plates 2 of the cylinder skirt close to the side walls around the ladle concrete cylinder skirt 1, their outer ends are also welded to the steel shells on the side walls around the ladle concrete cylinder skirt main body.

[0102] In the present invention, the ladle concrete cylinder skirt 1 and the inner compartment plates 2 of the cylinder skirt are connected by welding. The inner compartment plates 2 of the cylinder skirt divide the internal space of the ladle concrete cylinder skirt main body into a plurality of compartments. See Figure 1b and Figure 6 As shown, specifically including 7 compartments and 12 compartment plates. The reason for dividing the internal space of the ladle concrete cylinder skirt main body into a plurality of compartments is mainly to improve the floating stability of the wind power foundation during the transportation period and facilitate the overall towing of the wind power foundation of the present invention, that is, to tow the wind power foundation of the present invention (except for the steel inner truss 7) to the target sea area through a floating ship.

[0103] In the present invention, in terms of specific implementation, for the ladle concrete cylinder skirt 1, the bottom surface of the support steel plate is welded to the top of the inner compartment plates 2 of the cylinder skirt.

[0104] In terms of specific implementation, a circle of upwardly protruding steel baffles is welded around the top four edges of the support steel plate;

[0105] The reinforced concrete beam system 3 is poured inside the steel baffles.

[0106] In the present invention, in terms of specific implementation, the ladle concrete vertical transition section 5 is generally cylindrical and includes a ladle concrete vertical transition section main body with a hollow interior;

[0107] The main body of the vertical transition section of the ladle concrete is a concrete main body made by pouring concrete (i.e., the surrounding side walls are concrete side walls).

[0108] On the inner and outer surfaces of the surrounding concrete side walls (i.e., concrete side walls) of the main body of the vertical transition section of the ladle concrete, a steel shell is fixedly wrapped (i.e., steel cladding treatment is carried out).

[0109] Specifically, the height range of the vertical transition section 5 of the ladle concrete is 15 - 22 m.

[0110] The thickness range of the concrete in the main body of the vertical transition section of the ladle concrete is 0.5 - 1.5 m.

[0111] The thickness of the steel shell in the main body of the vertical transition section of the ladle concrete is 8 - 15 mm.

[0112] Specifically, inside the surrounding concrete side walls of the vertical transition section 5 of the ladle concrete, multiple circular prestressed steel strands are arranged (embedded) from top to bottom.

[0113] Specifically, for the present invention, the top of the reinforced concrete beam system structure 3 is welded to the bottom of the vertical transition section 5 of the ladle concrete. Specifically: a flange is embedded in the reinforced concrete beam system structure 3, and then through the flange, it is welded to the steel shell at the bottom of the vertical transition section 5 of the ladle concrete. It should be noted that the connection of the reinforced concrete beam system structure 3 to the vertical transition section of the ladle concrete by embedding a flange is a conventional installation method in the existing field.

[0114] In the present invention, specifically, the whole of the steel vertical transition section 6 is a cylindrical steel structure.

[0115] In the present invention, specifically, a flange is welded to the bottom of the steel vertical transition section 6, and a flange is welded to the top of the vertical transition section 5 of the ladle concrete.

[0116] The flange at the bottom of the steel vertical transition section 6 and the flange at the top of the vertical transition section 5 of the ladle concrete are fixedly connected by multiple bolts passing through the through holes on the flanges correspondingly.

[0117] Specifically, the diameter of the flange is 6 - 9 m, and the thickness is 50 - 100 mm.

[0118] In the present invention, the reinforced concrete beam system structure 3 includes a concrete main body in the shape of a regular hexagonal prism, and a steel structure is arranged inside the concrete main body.

[0119] In the present invention, the steel structure arranged inside the concrete main body of the reinforced concrete beam system structure 3 includes multiple prestressed steel bars and a steel mesh.

[0120] In the present invention, specifically, the top of the support steel plate is welded to the steel bar mesh embedded in the reinforced concrete beam system structure 3.

[0121] It should be noted that, specifically, the reinforced concrete beam system structure 3 is a regular hexagonal prism-shaped structure, and its concrete main body (regular hexagonal prism shape) includes two layers of prestressed steel bars up and down. Each layer of prestressed steel bars can include three prestressed steel bars, and each prestressed steel bar is respectively located on a diagonal line of the reinforced concrete beam system structure 3. Of course, according to needs, any number of prestressed steel bars can also be set at other positions. The function of the prestressed steel bars (steel strands) is to make the bending resistance and bearing capacity of the reinforced concrete beam system structure 3 stronger.

[0122] Of course, it should be noted that in the concrete main body (regular hexagonal structure) of the reinforced concrete beam system structure 3, there is also a steel bar mesh composed of a plurality of ordinary steel bars fixedly connected, which is used to restrain the use of concrete. The steel bar mesh is formed by bundling steel bars vertically and horizontally at a certain spacing to form a steel bar framework in a similar mesh shape with a certain stress state. The framework formed by bundling such a large number of steel bars together is commonly called a steel bar mesh. The steel bar mesh is a common steel bar mesh structure in reinforced concrete and will not be elaborated here.

[0123] In the present invention, for the truss-combined steel-concrete cylindrical wind power foundation provided by the present invention, at least one of the three structures of the steel-concrete-filled inclined support 4, the steel inner truss 7, and the steel outer truss 8 can also be selected according to environmental and load conditions.

[0124] Embodiment 1.

[0125] Figures 1a to 1b , which are respectively the perspective view, front view, and top view structure schematic diagrams of a truss-combined steel-concrete cylindrical wind power foundation provided by the present invention when the steel inner truss is installed in Embodiment 1.

[0126] See Figures 1a to 1b As shown, in the present invention, specifically, in the internal cavities of the steel-concrete-filled vertical transition section 5 and the steel vertical transition section 6, a vertically distributed steel inner truss 7 is installed;

[0127] The whole of the steel inner truss 7 is of a steel structure.

[0128] Specifically, the lower part of the steel inner truss 7 is welded to the steel shell on the inner side of the concrete side wall (i.e., the concrete side wall) around the steel-concrete-filled vertical transition section 5;

[0129] The middle and upper parts of the steel inner truss 7 are welded to the inner side of the steel vertical transition section 6.

[0130] Specifically, the steel inner truss 7 can be arranged in 2 to 20 layers, and each layer is 3 to 6 m high.

[0131] Example 2

[0132] Figures 2a to 2b , respectively, are the perspective view, front view, and top view structural schematic diagrams of a truss - combined steel - concrete cylindrical wind power foundation provided by the present invention when a steel outer truss is installed in Example 2;

[0133] See Figures 2a to 2b As shown, in the present invention, specifically, on the outer walls of the steel - encased concrete vertical transition section 5 and the steel vertical transition section 6, a steel outer truss 8 is installed around;

[0134] The whole of the steel outer truss 8 is of steel structure;

[0135] The central point of the steel outer truss 8 and the central points of the steel - encased concrete vertical transition section 5 and the steel vertical transition section 6 are located on the same central axis.

[0136] Specifically, the upper part of the steel outer truss 8 is welded to the lower outer wall of the steel vertical transition section 6;

[0137] The middle and lower parts of the steel outer truss 8 are welded to the steel shell on the outer side of the surrounding concrete side walls (i.e., concrete side walls) of the steel - encased concrete vertical transition section 5.

[0138] Specifically, the bottom of the steel outer truss 8 is welded to the steel bar structure arranged in the concrete main body of the reinforced concrete beam system 3.

[0139] Specifically, the steel outer truss 8 can be arranged in 2 - 6 layers, with each layer having a height of 3 - 6m.

[0140] Example 3

[0141] Figures 3a to 3b , respectively, are the perspective view, front view, and top view structural schematic diagrams of a truss - combined steel - concrete cylindrical wind power foundation provided by the present invention when a steel outer truss and a steel inner truss are installed in Example 3;

[0142] See Figures 3a to 3b As shown, in the present invention, in the internal cavities of the steel - encased concrete vertical transition section 5 and the steel vertical transition section 6, a vertically distributed steel inner truss 7 is installed;

[0143] On the outer walls of the steel - encased concrete vertical transition section 5 and the steel vertical transition section 6, a steel outer truss 8 is installed around;

[0144] The wholes of the steel inner truss 7 and the steel outer truss 8 are both of steel structure;

[0145] The central point of the steel outer truss 8, the central points of the steel - lined concrete vertical transition section 5 and the steel vertical transition section 6 are located on the same central axis.

[0146] Specifically, the lower part of the steel inner truss 7 is welded to the steel shell on the inner side of the concrete side walls (i.e., the concrete side walls) around the steel - lined concrete vertical transition section 5.

[0147] The middle and upper parts of the steel inner truss 7 are welded to the inner side of the steel vertical transition section 6.

[0148] Specifically, the upper part of the steel outer truss 8 is welded to the lower outer wall of the steel vertical transition section 6.

[0149] The middle and lower parts of the steel outer truss 8 are welded to the steel shell on the outer side of the concrete side walls (i.e., the concrete side walls) around the steel - lined concrete vertical transition section 5.

[0150] Specifically, the steel inner truss 7 can be arranged in 2 - 20 layers, with each layer having a height of 3 - 6m.

[0151] Specifically, the bottom of the steel outer truss 8 is welded to the steel structure arranged in the concrete main body of the reinforced concrete beam system 3.

[0152] Specifically, the steel outer truss 8 can be arranged in 2 - 6 layers, with each layer having a height of 3 - 6m.

[0153] Embodiment Four.

[0154] Figures 4a to 4b , respectively, are the perspective view, front view, and top - down structural schematic diagram of a truss - combined steel - concrete cylindrical wind power foundation provided by the present invention when a steel inner truss and a steel - lined concrete inclined support beam are installed in Embodiment Four;

[0155] See Figures 4a to 4b As shown, in the present invention, in the inner cavities of the steel - lined concrete vertical transition section 5 and the steel vertical transition section 6, a vertically distributed steel inner truss 7 is installed;

[0156] The whole of the steel inner truss 7 is of a steel structure;

[0157] The steel shells on the outer side of the upper part of the steel - lined concrete vertical transition section 5 are respectively welded to the tops of multiple (for example, 3 to 12) steel - lined concrete inclined support beams 4 at equal intervals;

[0158] The bottoms of the steel - lined concrete inclined support beams 4 are respectively welded to the steel structures arranged in the concrete main body of the reinforced concrete beam system 3 at the top of the steel - lined concrete barrel skirt 1 (preferably at the top of the corners) at equal intervals.

[0159] In specific implementation, the ladle concrete inclined support beam 4 is inclined, and the included angle between the middle main body part thereof and the horizontal plane is 30° to 75°.

[0160] In specific implementation, the lower part of the steel inner truss 7 is welded to the steel shell on the inner side of the concrete side walls (i.e., concrete side walls) around the ladle concrete vertical transition section 5;

[0161] The middle and upper parts of the steel inner truss 7 are welded to the inner side surface of the steel vertical transition section 6.

[0162] In specific implementation, the steel inner truss 7 can be arranged in 2 to 15 layers, and the height of each layer is 3 to 6 m.

[0163] Example Five.

[0164] Figures 5a to 5b , respectively, are perspective view, front view, and top view structure schematic diagrams of a truss-combined steel-concrete cylindrical wind power foundation provided by the present invention when a steel inner truss, a steel outer truss, and a ladle concrete inclined support beam are installed in Example Five;

[0165] See Figures 5a to 5b As shown, in the present invention, a vertically distributed steel inner truss 7 is installed in the inner cavities of the ladle concrete vertical transition section 5 and the steel vertical transition section 6;

[0166] Steel outer trusses 8 are installed around the outer walls of the ladle concrete vertical transition section 5 and the steel vertical transition section 6;

[0167] The whole of the steel inner truss 7 and the steel outer truss 8 is of steel structure;

[0168] The center point of the steel outer truss 8 and the center points of the ladle concrete vertical transition section 5 and the steel vertical transition section 6 are located on the same central axis;

[0169] Among them, the steel shells on the outer side surfaces of the upper parts of the ladle concrete vertical transition section 5 are respectively welded to the tops of multiple (for example, 3 to 12) ladle concrete inclined support beams 4 at equal intervals;

[0170] It should be noted that the ladle concrete inclined support beam 4 includes a hollow steel pipe (such as a square steel pipe), and concrete is poured inside the steel pipe, and the inner cavity of the steel pipe is filled with concrete.

[0171] The bottoms of the ladle concrete inclined support beams 4 are respectively welded to the steel bar structures arranged in the concrete main body of the reinforced concrete beam system 3 at equal intervals.

[0172] In specific implementation, the ladle concrete inclined support beam 4 is inclined, and the included angle between the middle main body part thereof and the horizontal plane is 30° to 75°.

[0173] Specifically, the lower part of the steel inner truss 7 is welded to the steel shell on the inner side of the concrete side walls (i.e., the concrete side walls) around the steel-concrete vertical transition section 5;

[0174] The middle and upper parts of the steel inner truss 7 are welded to the inner side of the steel vertical transition section 6.

[0175] Specifically, the upper part of the steel outer truss 8 is welded to the lower outer wall of the steel vertical transition section 6;

[0176] The middle and lower parts of the steel outer truss 8 are welded to the steel shell on the outer side of the concrete side walls (i.e., the concrete side walls) around the steel-concrete vertical transition section 5.

[0177] Specifically, the steel inner truss 7 can be arranged in 2 to 15 layers, with each layer having a height of 3 to 6 m.

[0178] Specifically, the bottom of the steel outer truss 8 is connected to the steel structure arranged in the concrete main body of the reinforced concrete beam system 3.

[0179] Specifically, the steel outer truss 8 can be arranged in 2 to 6 layers, with each layer having a height of 3 to 6 m.

[0180] In Example 5, the height of the steel-concrete cylinder skirt 1 can be 20 m; the concrete wall thickness in the main body of the steel-concrete cylinder skirt is 0.35 m, and the thickness of the steel shell is 8 mm.

[0181] In Example 5, in the steel-concrete inner support truss combined cylindrical foundation, the steel-concrete cylinder skirt 1 in the shape of a regular hexagon serving as the cylindrical foundation has an opposite side diameter of 38 m.

[0182] In Example 5, the height range of the steel-concrete vertical transition section 5 is 20 m;

[0183] The concrete thickness range in the main body of the steel-concrete vertical transition section is 1 m;

[0184] The thickness of the steel shell in the main body of the steel-concrete vertical transition section is 15 mm.

[0185] In Example 5, the included angle between the middle main body part of the steel-concrete inclined support beam 4 and the horizontal plane is 55°.

[0186] In Example 5, the height of the steel-concrete vertical transition section 5 can be 20 m, and the height of the steel vertical transition section 6 can be 40 m.

[0187] In Example 5, for the flange at the bottom of the steel vertical transition section 6 and the flange at the top of the steel-concrete vertical transition section 5, the diameter of the flange is 8.5 m and the thickness is 80 mm.

[0188] In the fifth embodiment, the steel inner truss 7 can be arranged in 6 layers, with each layer having a height of 6 m and a total height of 36 m. The steel outer truss 8 can be arranged in 5 layers, with each layer having a height of 5 m.

[0189] In order to construct the truss-combined steel-concrete cylindrical wind power foundation provided by the present invention, the present invention also provides a construction method for the truss-combined steel-concrete cylindrical wind power foundation, which specifically includes the following steps:

[0190] First step, use a floating ship to tow the hexagonal cylindrical foundation (the truss-combined steel-concrete cylindrical wind power foundation except the steel inner truss 7) as a whole to the target sea area where the wind turbine needs to be installed;

[0191] Among them, the hexagonal cylindrical foundation includes the steel-concrete cylinder skirt 1, the inner partition board 2 of the cylinder skirt, the reinforced concrete beam system 3, the steel-concrete inclined support beam 4, the steel-concrete vertical transition section 5, the steel vertical transition section 6 and the steel outer truss 8 that have been completed for installation;

[0192] Second step, in the target sea area where the wind turbine needs to be installed, use the negative pressure sinking method to sink the hexagonal cylindrical foundation to the seabed. Among them, the overall height of the hexagonal cylindrical foundation is higher than the water depth of the target sea area;

[0193] In the present invention, air extraction holes are reserved on the support steel plate, and air extraction holes are also reserved on the reinforced concrete beam system 3, and the air extraction holes of the two are connected up and down; the top of the air extraction hole of the reinforced concrete beam system 3 is located at the bottom of the inner cavity of the steel-concrete vertical transition section 5.

[0194] It should be noted that the negative pressure sinking method refers to pumping out the air and water in the unentered soil space in the multiple compartments separated by the inner partition board 2 of the cylinder skirt through a pump, forming a negative pressure space lower than the external air pressure in this space, and the internal and external pressure difference forms a driving force, so that the foundation sinks, reducing the auxiliary sinking engineering machinery and equipment.

[0195] The negative pressure sinking method is an existing technology. Specifically, reference can be made to the Chinese invention patent application "A Negative Pressure Control Device for Sinking Cylindrical Foundations and Its Use Method", the patent application publication number is CN106436786A; and reference can also be made to the Chinese invention patent application "A Composite Cylindrical Foundation Sinking Attitude Feed Control System", the patent application publication number is CN106988335A; reference can also be made to the Chinese invention patent application "A Steel-Concrete Composite Cylindrical Foundation Structure and Its Construction Method", the patent application publication number is CN102877478A.

[0196] In the third step, the steel internal truss 7 prefabricated on land is placed into the inner cavities of the steel-concrete vertical transition section 5 and the steel vertical transition section 6 from top to bottom through the top opening of the steel vertical transition section 6. Then, the steel internal truss 7 is welded to the steel-concrete vertical transition section 5 and the steel vertical transition section 6. Thus, the construction of the truss-combined steel-concrete cylindrical wind power foundation is completed.

[0197] In the present invention, it should be noted that the steel vertical transition section 6, as a part of the tower barrel, is a conventional support structure of the wind turbine and is generally used in combination with the wind turbine in the upper part. The installation method of the tower barrel and the wind turbine can adopt the existing conventional installation method, which is not the innovation point of this patent and will not be elaborated here.

[0198] Compared with the prior art, the truss-combined steel-concrete cylindrical wind power foundation provided by the present invention has the following beneficial effects:

[0199] 1. Adopting the combined foundation type of the cylindrical wind power foundation (i.e., the steel-concrete cylinder skirt 1), the steel-concrete vertical transition section and the steel vertical transition section, compared with the traditional variable-diameter transition section, the formwork erection is more convenient and the pouring is easier, which can greatly improve the construction efficiency of on-site pouring.

[0200] 2. Compared with the large-diameter single-pile wind power foundation, the steel consumption is small, and the cylindrical foundation can be quickly sunk and installed by negative pressure.

[0201] For the present invention, due to the large diameter of the cylindrical foundation, mostly 30m - 38m, while the diameter of the existing single pile is mostly 5m - 8m, the pressure difference acting area formed by negative pressure inside the cylindrical foundation of the present invention is large, which can provide a greater driving force. The existing single-pile wind power foundation has a small diameter and a large penetration depth, and currently, the driving pile form is used for installation in engineering.

[0202] 3. The steel vertical transition section and the steel-concrete vertical transition section can be connected by a flange, and the flange is locked and fixed by bolts, and can be assembled by local structures, which shortens the construction period and reduces the cost of offshore wind power construction.

[0203] 4. With the steel internal truss, the steel external truss and the steel-concrete inclined support beam, the combination is selected according to the environmental and load conditions. In the deep water area (water depth exceeding 40m) and small megawatt (installed capacity less than 6MW) conditions, the steel internal truss structure or the steel external truss structure can be used as the transition section support. The truss structure evenly transfers part of the load received by the transition section to the reinforced concrete beam system 3.

[0204] 5. The truss structure (including the steel inner truss and the steel outer truss) has a small steel consumption and can be prefabricated in the factory and integrally hoisted and welded on site. Under the conditions of deep water area (water depth exceeding 40m) and small megawatts (installed capacity of 6 - 8MW), the combination of the steel inner truss and the steel outer truss is used as the support for the transition section.

[0205] 6. The steel outer truss structure can support a larger height range compared with the inclined support structure (i.e., the steel - wrapped concrete inclined support beam), effectively solving the problem of excessive inclination rate caused by large flexibility and insufficient support when the water depth of the transition section is large. It is applicable to deeper sea areas and expands the applicable water depth range of the cylindrical foundation.

[0206] 7. Under the conditions of deep water area (water depth exceeding 40m) and large megawatts (installed capacity greater than 8MW), the combination of inclined support (i.e., the steel - wrapped concrete inclined support beam) and the steel inner truss, or the combination of inclined support, inner and outer trusses is adopted. The inner truss structure is designed inside the steel vertical transition section, which can increase the horizontal bearing capacity and anti - overturning capacity of the steel vertical transition section without increasing the wave force, reduce the steel consumption of the steel vertical transition section, and give full play to the material properties of steel.

[0207] In the present invention, for the truss - combined steel - concrete cylindrical wind power foundation provided by the present invention, except that the truss structure (including the steel inner truss 7 and the steel outer truss 8) uses Q235 steel, the steel used in the remaining structures all adopts Q345 steel.

[0208] It should be noted that the insufficient flexural stiffness and anti - overturning capacity are for the existing wind turbine foundation in terms of its shape, while the new shape designed by the present invention meets the flexural and anti - overturning conditions under large megawatts and large water depths.

[0209] For large - megawatt foundations, as the foundation size increases, the steel consumption of the structure will inevitably increase; when developing towards deep water, the structure is higher and the slenderness ratio also increases. Since the traditional offshore wind power foundation is a standard high - rise flexible structure, its flexural stiffness is insufficient and the anti - overturning capacity is insufficient. By using concrete structure to replace part of the steel structure in the present invention, the purpose of saving steel consumption can be achieved. In addition, for the present invention, through the use of trusses (including the steel inner truss 7 and the steel outer truss 8), the wall thickness of the steel transition section (including the steel - wrapped concrete vertical transition section 5 and the steel vertical transition section 6) is effectively reduced. At present, the existing single - pile manufacturing technology (wall thickness exceeding 150mm) is not yet mature. Using the truss structure designed by the present invention to support and protect the upper flexible structure in the wind power foundation can not only save steel but also further reduce the manufacturing difficulty and increase the stiffness of the structure.

[0210] In summary, compared with the prior art, a truss-combined steel-concrete cylindrical wind power foundation provided by the present invention is scientifically designed, has a relatively high flexural stiffness and good anti-overturning ability, can better meet the installation requirements of deep-water large-capacity wind turbines, and has great practical significance.

[0211] After inspection, by applying the present invention, the installation requirements of large-megawatt (for example, the installed capacity is greater than 8 MW) wind turbines in deep water areas (for example, the water depth exceeds 40 m) can be met.

[0212] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A truss-combined steel-concrete cylindrical wind power foundation, characterized in that, It includes a horizontally placed ladle concrete cylindrical skirt (1); Above the ladle concrete cylindrical skirt (1), a reinforced concrete beam system structure (3) is cast and provided; At the top center position of the reinforced concrete beam system structure (3), a vertically distributed ladle concrete vertical transition section (5) is fixedly connected; At the top of the ladle concrete vertical transition section (5), it is connected to the bottom of the steel vertical transition section (6); Among them, the ladle concrete vertical transition section (5) and the steel vertical transition section (6) are hollow cylindrical structures; The top end of the ladle concrete vertical transition section (5) is open; Both the upper and lower ends of the steel vertical transition section (6) are open; The top of the ladle concrete vertical transition section (5) and the bottom of the steel vertical transition section (6) are connected and communicate; The central points of the ladle concrete cylindrical skirt (1), the ladle concrete vertical transition section (5), and the steel vertical transition section (6) are located on the same central axis; Inside the internal cavities of the ladle concrete vertical transition section (5) and the steel vertical transition section (6), a vertically distributed steel internal truss (7) is installed; Around the outer walls of the ladle concrete vertical transition section (5) and the steel vertical transition section (6), a steel outer truss (8) is installed; The whole of the steel internal truss (7) and the steel outer truss (8) is of steel structure; The central point of the steel outer truss (8) and the central points of the ladle concrete vertical transition section (5) and the steel vertical transition section (6) are located on the same central axis; Among them, the steel shells on the outer side surface of the upper part of the ladle concrete vertical transition section (5) are respectively welded to the tops of multiple ladle concrete inclined support beams (4) at equal intervals; The ladle concrete inclined support beam (4) includes a hollow steel pipe, and concrete is cast inside the steel pipe, and the internal cavity of the steel pipe is filled with concrete; The bottoms of the ladle concrete inclined support beams (4) are respectively welded to the steel bar structures arranged inside the concrete main body of the reinforced concrete beam system structure (3) at equal intervals; The lower part of the steel internal truss (7) is welded to the steel shell on the inner side surface of the surrounding concrete side walls of the ladle concrete vertical transition section (5); The middle and upper parts of the steel internal truss (7) are welded to the inner side surface of the steel vertical transition section (6); The upper part of the steel outer truss (8) is welded to the lower outer wall of the steel vertical transition section (6); The middle and lower parts of the steel outer truss (8) are welded to the steel shells on the outer side surfaces of the surrounding concrete side walls of the ladle concrete vertical transition section (5); The bottom of the steel outer truss (8) is welded to the steel bar structure arranged inside the concrete main body of the reinforced concrete beam system structure (3).

2. The truss-combined steel-concrete cylinder-shaped wind power foundation according to claim 1, wherein The ladle concrete cylindrical skirt (1) includes a ladle concrete cylindrical skirt main body with a hollow interior and a regular hexagonal prism shape; This ladle concrete cylindrical skirt main body is a concrete main body made by casting concrete; Both the inner and outer surface sides of this ladle concrete cylindrical skirt main body are wrapped with steel shells; The steel shell located at the top of this ladle concrete cylindrical skirt main body is welded to a layer of horizontally distributed support steel plates.

3. The truss-combined steel-concrete cylindrical wind power foundation according to claim 2, wherein Inside the ladle concrete cylindrical skirt (1), multiple inner compartment plates of the cylindrical skirt (2) are fixedly arranged; Multiple internal partition plates (2) of the barrel skirt are used to divide the steel - lined concrete barrel skirt (1) into multiple hollow compartments in a honeycomb shape; Among them, the internal partition plate (2) of the barrel skirt is a steel plate, which is welded to the steel shell on the inner side of the bottom of the main body of the steel - lined concrete barrel skirt; For the steel - lined concrete barrel skirt (1), the bottom surface of the supporting steel plate is welded to the top of the internal partition plate (2) of the barrel skirt; Among them, a circular upward - protruding steel baffle is welded around the top four - week edge of the supporting steel plate; The reinforced concrete beam system structure (3) is poured inside the steel baffle; 4. The truss-combined steel-concrete cylindrical wind power foundation according to claim 1, wherein The steel - lined concrete vertical transition section (5) is cylindrical as a whole, including a steel - lined concrete vertical transition section main body with a hollow interior; The main body of the steel - lined concrete vertical transition section is a concrete main body made by pouring concrete; On the inner and outer surfaces of the concrete side walls around the main body of the steel - lined concrete vertical transition section, steel shells are fixedly wrapped; The whole of the steel vertical transition section (6) is a cylindrical steel structure; A flange is welded to the bottom of the steel vertical transition section (6), and a flange is welded to the top of the steel - lined concrete vertical transition section (5); The flange at the bottom of the steel vertical transition section (6) and the flange at the top of the steel - lined concrete vertical transition section (5) are fixedly connected by multiple bolts passing through the through - holes on the flanges correspondingly; 5. The truss-combined steel-concrete cylinder-shaped wind power foundation according to claim 2, wherein The reinforced concrete beam system structure (3) includes a reinforced concrete main body in the shape of a regular hexagonal prism, and a steel bar structure is arranged in the concrete main body; The steel bar structure includes multiple prestressed steel bars and a steel bar mesh; The top of the supporting steel plate is welded to the steel bar mesh embedded in the reinforced concrete beam system structure (3); 6. The truss - combined steel - concrete cylindrical wind power foundation according to any one of claims 1 to 5, characterized in that, The steel - lined concrete inclined support beam (4) is inclined, and the included angle between the middle main body part and the horizontal plane is 30° - 75°.

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