CN112854292A - Truss combined type steel-concrete cylindrical wind power foundation - Google Patents

Abstract

The invention discloses a truss combined type steel-concrete cylindrical wind power foundation which comprises a steel ladle concrete cylindrical skirt; a reinforced concrete beam system structure is poured and arranged above the steel ladle concrete cylindrical skirt; the top center position of the reinforced concrete beam system structure is fixedly connected with a vertically distributed ladle concrete upright transition section; the top of the steel ladle concrete upright transition section is connected with the bottom of the steel upright transition section; the steel ladle concrete upright transition section and the steel upright transition section are hollow cylindrical structures, and truss structures are arranged in the hollow cylindrical structures; the top end of the steel ladle concrete upright transition section is provided with an opening; the upper end and the lower end of the steel upright transition section are respectively provided with an opening; the central points of the ladle concrete skirt, the ladle concrete upright transition section, the steel upright transition section and the truss are positioned on the same central axis. The truss combined type steel-concrete cylindrical wind power foundation disclosed by the invention can meet the installation requirement of a large megawatt wind driven generator in a deep water area, and has higher bending rigidity and good anti-overturning capability.

Description

Truss combined type steel-concrete cylindrical wind power foundation

Technical Field

The invention relates to the technical field of offshore wind power foundation structures, in particular to a truss combined type steel-concrete cylinder type wind power foundation.

Background

Wind energy is an inexhaustible renewable clean energy. Compared with the traditional fossil fuel, the wind energy is clean in use and low in cost, and has the advantages of wide development range, safety, inexhaustible energy and the like. Compared with onshore wind power, offshore wind power has the advantages of high wind speed, low turbulence, no land occupation and the like.

Modern wind generating set mainly includes wind power basis and sets up the aerogenerator at the tower section of thick bamboo on wind power basis upper portion and top, and guarantees the key of wind generating set safety and normal operating and lie in: and supporting the wind power foundation of the wind driven generator. Wind foundations, typically comprising a foundation structure below a tower for supporting the tower and the wind turbine;

at present, pile foundations or composite pile foundations are mostly adopted for offshore wind power foundations in China, the design is simple, the installation process is mature, but the horizontal deformation caused by transverse loads (wind, wave and flow) is large.

With the strong support of China on offshore wind power, offshore wind power in China is developed to enter a freeway. At present, the development of the wind energy resources in the offshore area tends to be saturated. In order to realize higher output, offshore wind power must be developed to deep water and large capacity in the future. When the installation condition of a large megawatt (for example, the installed capacity is more than 8MW) wind driven generator is carried out in a deep water area (for example, the water depth is more than 40m), the offshore wind power foundation is required to have larger bearing capacity, and higher requirements are put forward on the load transmission mode of the structure.

However, for the conventional offshore wind power foundation, the installation requirement of a wind power generator with large megawatt (for example, the installed capacity is more than 8MW) in a deep water area (for example, the water depth is more than 40m) cannot be met, and under the installation condition of the wind power generator with large megawatt (for example, the installed capacity is more than 8MW) in the deep water area (for example, the water depth is more than 40m), the problems of insufficient bending rigidity, insufficient anti-overturning capacity and the like exist.

Therefore, there is a need to develop a technical solution to solve the above problems.

Disclosure of Invention

The invention aims to provide a truss combined type steel-concrete cylinder type wind power foundation aiming at the technical defects in the prior art.

Therefore, the invention provides a truss combined type steel-concrete cylindrical wind power foundation which comprises a horizontally placed steel ladle concrete cylindrical skirt;

wherein, a reinforced concrete beam system structure is poured above the steel ladle concrete cylinder skirt;

the top center of the reinforced concrete beam system structure is fixedly connected with vertically distributed vertical transition sections of the ladle concrete;

the top of the steel ladle concrete upright transition section is connected with the bottom of the steel upright transition section;

wherein, the steel ladle concrete vertical transition section and the steel vertical transition section are hollow cylindrical structures;

the top end of the steel ladle concrete upright transition section is provided with an opening;

the upper end and the lower end of the steel upright transition section are respectively provided with an opening;

the top of the steel ladle concrete upright transition section is communicated with the bottom of the steel upright transition section;

the central points of the ladle concrete skirt, the ladle concrete upright transition section and the steel upright transition section are positioned on the same central axis.

Preferably, the ladle concrete cylinder skirt comprises a ladle concrete cylinder skirt main body which is hollow inside and has a regular hexagonal prism shape;

the ladle concrete cylindrical skirt main body is a concrete main body which is formed by pouring concrete;

the inner side surface and the outer side surface of the steel ladle concrete cylinder skirt main body are both wrapped with steel shells;

the steel shell positioned on the top of the steel ladle concrete cylinder skirt main body is welded with a layer of horizontally distributed supporting steel plates.

Preferably, a plurality of cabin plates in the cylinder skirt are fixedly arranged in the steel ladle concrete cylinder skirt;

the plurality of inner cabin plates of the cylinder skirt are used for dividing the steel ladle concrete cylinder skirt into a plurality of honeycomb hollow cabins;

the inner partition plate of the cylinder skirt is a steel plate and is welded with a steel shell on the inner side of the bottom of the steel ladle concrete cylinder skirt main body;

for the steel ladle concrete cylindrical skirt, the bottom surface of the supporting steel plate is welded with the top of the inner partition plate of the cylindrical skirt;

the steel enclosure baffle plate is characterized in that a circle of steel enclosure baffle plates protruding upwards are welded around the periphery of the top of the support steel plate;

and the reinforced concrete beam system structure is poured on the inner side of the steel fence.

Preferably, the ladle concrete upright transition section is cylindrical as a whole and comprises a ladle concrete upright transition section main body with a hollow interior;

the ladle concrete upright transition section main body is a concrete main body which is formed by pouring concrete;

the inner side surface and the outer side surface of the concrete side wall at the periphery of the steel ladle concrete upright transition section main body are fixedly wrapped with steel shells;

the whole steel upright transition section is of a cylindrical steel structure;

a flange is welded at the bottom of the steel upright transition section, and a flange is welded at the top of the steel ladle concrete upright transition section;

the flange at the bottom of the steel upright transition section and the flange at the top of the steel ladle concrete upright transition section are fixedly connected by a plurality of bolts correspondingly penetrating through the through holes on the flanges.

Preferably, the reinforced concrete beam system structure comprises a concrete main body in a regular hexagonal prism shape, and a reinforced structure is arranged in the concrete main body;

the steel bar structure comprises a plurality of prestressed steel bars and a steel bar mesh;

the top of the supporting steel plate is welded with a reinforcing mesh pre-embedded in the reinforced concrete beam system structure.

Preferably, vertically distributed steel inner trusses are arranged in the inner cavities of the steel ladle concrete upright transition section and the steel upright transition section;

the whole steel inner truss is of a steel structure;

the lower part of the steel inner truss is welded with a steel shell on the inner side surface of the concrete side wall around the vertical transition section of the ladle concrete;

the middle part and the upper part of the steel inner truss are welded with the inner side surface of the steel upright transition section.

Preferably, the outer walls of the steel ladle concrete upright transition section and the steel upright transition section are provided with steel outer trusses in a surrounding manner;

the whole steel outer truss is of a steel structure;

the central point of the steel outer truss, the central points of the steel ladle concrete upright transition section and the steel upright transition section are positioned on the same central axis;

the upper part of the steel outer truss is welded with the outer wall of the lower part of the steel upright transition section;

the middle part and the lower part of the steel outer truss are welded with the steel shell on the outer side surface of the concrete side wall around the steel ladle concrete upright transition section;

the bottom of the steel outer truss is welded with a steel bar structure arranged in a concrete main body of the reinforced concrete beam system structure.

Preferably, vertically distributed steel inner trusses are arranged in the inner cavities of the steel ladle concrete upright transition section and the steel upright transition section;

the outer walls of the steel ladle concrete upright transition section and the steel upright transition section are provided with steel outer trusses in a surrounding way;

the steel inner truss and the steel outer truss are both of steel structures;

the central point of the steel outer truss, the central points of the steel ladle concrete upright transition section and the steel upright transition section are positioned on the same central axis;

the bottom of the steel outer truss is welded with a steel bar structure arranged in a concrete main body of the reinforced concrete beam system structure.

Preferably, vertically distributed steel inner trusses are arranged in the inner cavities of the steel ladle concrete upright transition section and the steel upright transition section;

the whole steel inner truss is of a steel structure;

the steel shell on the outer side surface of the upper part of the vertical transition section of the ladle concrete is respectively welded with the top ends of the plurality of ladle concrete inclined supporting beams at equal intervals;

the ladle concrete inclined supporting beam comprises a hollow steel pipe, concrete is poured in the steel pipe, and a cavity in the steel pipe is filled with the concrete;

the bottom ends of the ladle concrete inclined supporting beams are respectively welded with a steel bar structure arranged in a concrete main body of the reinforced concrete beam system structure at equal intervals;

the ladle concrete inclined supporting beam is obliquely arranged, and the included angle between the middle main body part and the horizontal plane is 30-75 degrees.

Preferably, vertically distributed steel inner trusses are arranged in the inner cavities of the steel ladle concrete upright transition section and the steel upright transition section;

the outer walls of the steel ladle concrete upright transition section and the steel upright transition section are provided with steel outer trusses in a surrounding way;

the steel inner truss and the steel outer truss are both of steel structures;

the central point of the steel outer truss, the central points of the steel ladle concrete upright transition section and the steel upright transition section are positioned on the same central axis;

wherein, the steel shell on the outer side surface of the upper part of the vertical transition section of the ladle concrete is respectively welded with the top ends of the plurality of ladle concrete inclined supporting beams at equal intervals;

the ladle concrete inclined supporting beam comprises a hollow steel pipe, concrete is poured in the steel pipe, and a cavity in the steel pipe is filled with the concrete;

the bottom ends of the ladle concrete inclined supporting beams are respectively welded with the steel bar structures arranged in the concrete main bodies of the reinforced concrete beam system structures at equal intervals.

Compared with the prior art, the truss combined type steel-concrete cylinder type wind power foundation provided by the invention is scientific in design, has higher bending rigidity and good anti-overturning capability, can better meet the installation requirement of a deepwater large-capacity wind power generator, and has great practical significance.

Through inspection, the invention can meet the installation requirement of a wind driven generator with large megawatt (for example, the installed capacity is more than 8MW) in a deep water area (for example, the water depth is more than 40 m).

Drawings

Fig. 1a to 1b are a front view and a top view of a truss combined type steel-concrete tubular wind power foundation provided by the invention, respectively, in a first embodiment, a steel inner truss is installed;

fig. 2a to 2b are a schematic front view and a schematic top view of a truss combined type steel-concrete tubular wind power foundation provided by the invention, respectively, in an embodiment ii, when a steel outer truss is installed;

fig. 3a to 3b are schematic front view and schematic top view of a truss combined type steel-concrete tubular wind power foundation provided by the invention, in a third embodiment, when a steel outer truss and a steel inner truss are installed;

fig. 4a to 4b are schematic front and top views of a truss combined type steel-concrete tubular wind power foundation provided by the invention, in a fourth embodiment, when a steel inner truss and a ladle concrete inclined supporting beam are installed;

fig. 5a to 5b are schematic front and top views of a truss combined type steel-concrete tubular wind power foundation provided by the invention, in a fifth embodiment, when a steel inner truss, a steel outer truss and a ladle concrete inclined support beam are installed;

fig. 6 is a schematic view of a subdivision in a steel ladle concrete skirt in a truss combined type steel-concrete cylinder type wind power foundation provided by the invention, wherein the steel ladle concrete skirt is divided into seven honeycombed compartments by subdivision plates in the skirt;

in the figure: 1. steel ladle concrete cylinder skirt; 2. a bulkhead inner; 3. a reinforced concrete beam system structure; 4. the ladle concrete inclined supporting beam; 5. a ladle concrete upright transition section;

6. a steel upright transition section; 7. steel inner trusses; 8. and (4) steel outer trusses.

Detailed Description

In order to make the technical means for realizing the invention easier to understand, the following detailed description of the present application is made in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant application and are not limiting of the application. It should be noted that, for convenience of description, only the portions related to the present application are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

It should be noted that in the description of the present application, the terms of direction or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application.

In addition, it should be noted that, in the description of the present application, unless otherwise explicitly specified and limited, the term "mounted" and the like should be interpreted broadly, and may be, for example, either fixedly mounted or detachably mounted.

The specific meaning of the above terms in the present application can be understood by those skilled in the art as the case may be.

Referring to fig. 1a to 6, the present invention provides a truss combined type steel-concrete cylindrical wind power foundation, including a horizontally placed steel ladle concrete cylindrical skirt 1;

wherein, a reinforced concrete beam system structure 3 is poured above the steel ladle concrete cylindrical skirt 1;

the center position of the top of the reinforced concrete beam system structure 3 is fixedly connected with a vertically distributed ladle concrete upright transition section 5;

the top of the ladle concrete upright transition section 5 is connected with the bottom of the steel upright transition section 6;

wherein the ladle concrete upright transition section 5 and the steel upright transition section 6 are hollow cylindrical structures;

the top end of the ladle concrete upright transition section 5 is opened;

the upper end and the lower end of the steel upright transition section 6 are respectively provided with an opening;

the top of the ladle concrete upright transition section 5 is communicated with the bottom of the steel upright transition section 6;

the central points of the ladle concrete skirt 1, the ladle concrete upright transition section 5 and the steel upright transition section 6 are positioned on the same central axis.

It should be noted that, in the invention, the ladle concrete skirt 1 is used as a base part of the wind power foundation for supporting a tower; the ladle concrete upright transition section 5 and the steel upright transition section 6 are used together as a tower barrel part of the wind power foundation.

In the invention, the cross section of the ladle concrete skirt 1 is in a regular hexagon shape.

In the invention, the ladle concrete skirt 1 comprises a hollow ladle concrete skirt main body in a regular hexagonal prism shape;

the ladle concrete cylindrical skirt main body is a concrete main body which is formed by pouring concrete;

the inside and outside both sides surface of this ladle concrete skirt main part all wraps up there is the steel-clad (having carried out the package steel promptly), that is to say, exposes the part outside and all wraps up the steel, specifically includes: the inner and outer side surfaces of the concrete side wall (namely the concrete side wall) at the periphery of 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 (namely steel wrapping treatment is carried out);

the steel shell positioned on the top of the steel ladle concrete cylinder skirt main body is welded with a layer of horizontally distributed supporting steel plates.

It should be noted that the method for steel-coating concrete is a known method, and is not described herein again.

It should be noted that, in particular, the height range of the ladle concrete skirt 1 is 16-24 m;

the wall thickness of concrete in the steel ladle concrete cylinder skirt main body is 0.3-0.4 m, and the thickness of a steel shell is 5-10 mm.

In the invention, a plurality of cabin plates 2 in the steel ladle concrete cylindrical skirt 1 are fixedly arranged inside the cylindrical skirt;

a plurality of skirt inner partition plates 2 for dividing the ladle concrete skirt 1 as a base into a plurality of hollow (for example, 7) cells in a honeycomb shape;

referring to fig. 1b and 6, the plurality of compartments specifically include: a central chamber 21 having a cross-sectional shape of a regular hexagon, and six surrounding chambers 22 of equal cross-sectional area distributed around the central chamber 21.

In the concrete implementation, the inner partition plate 2 of the skirt is a steel plate and is welded with the steel shell on the inner side of the bottom of the steel ladle concrete skirt main body, wherein the inner partition plate 2 of the skirt close to the peripheral side wall of the steel ladle concrete skirt 1 is welded with the steel shell on the peripheral side wall of the steel ladle concrete skirt main body at the outer side end.

In the invention, the ladle concrete skirt 1 and the inner bulkhead plate 2 of the skirt are welded, and the inner space of the ladle concrete skirt main body is divided into a plurality of cabins by the inner bulkhead plate 2 of the skirt, as shown in fig. 1b and fig. 6, specifically comprising 7 cabins and 12 bulkhead plates. The internal space of the ladle concrete skirt main body is divided into a plurality of cabins, so that the floating stability of the wind power foundation is improved during the transportation period, the whole machine towing of the wind power foundation is facilitated, and the whole machine towing of the wind power foundation (except for the steel inner truss 7) is achieved through a floating ship.

In the invention, in concrete implementation, the bottom surface of the steel ladle concrete cylinder skirt 1 is welded with the top of the cabin plate 2 in the cylinder skirt.

In the concrete implementation, a circle of steel enclosure baffle plates protruding upwards are welded around the periphery of the top of the support steel plate;

and the reinforced concrete beam system structure 3 is poured on the inner side of the steel enclosure plate.

In the invention, the ladle concrete upright transition section 5 is cylindrical as a whole and comprises a ladle concrete upright transition section main body with a hollow interior;

the ladle concrete upright transition section main body is a concrete main body (namely, the peripheral side walls are concrete side walls) which is formed by pouring concrete;

the inner side surface and the outer side surface of the concrete side wall (namely the concrete side wall) at the periphery of the steel ladle concrete upright transition section main body are fixedly wrapped with a steel shell (namely steel-wrapping treatment is carried out).

In particular, the height range of the vertical transition section 5 of the ladle concrete is 15-22 m;

the thickness range of concrete in the main body of the vertical transition section of the ladle concrete is 0.5-1.5 m;

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

In concrete implementation, a plurality of round prestressed steel strands are arranged (embedded) in the concrete side wall around the steel ladle concrete upright transition section 5 from top to bottom.

In particular, for the invention, the top of the reinforced concrete beam system structure 3 is welded with the bottom of the ladle concrete upright transition section 5, and the concrete method comprises the following steps: flanges are pre-embedded on the reinforced concrete beam system structure 3 and then welded with a steel shell at the bottom of the steel ladle concrete upright transition section 5 through the flanges. It should be noted that the reinforced concrete beam system structure 3 is connected with the vertical transition section of the ladle concrete in a way of embedding the flange, and is a conventional installation way in the prior art.

In the present invention, the whole steel upright transition section 6 is a cylindrical steel structure.

In the invention, a flange is welded at the bottom of the steel upright transition section 6, and a flange is welded at the top of the steel ladle concrete upright transition section 5;

the flange at the bottom of the steel upright transition section 6 and the flange at the top of the ladle concrete upright transition section 5 are fixedly connected by a plurality of bolts correspondingly penetrating through holes on the flanges.

In the concrete implementation, the diameter of the flange is 6-9 m, and the thickness is 50-100 mm.

In the present invention, the reinforced concrete beam system 3 includes a concrete body having a regular hexagonal prism shape, and a reinforcing structure is provided in the concrete body.

In the present invention, the steel bar structure provided in the concrete body of the reinforced concrete beam system 3 includes a plurality of prestressed steel bars and a steel bar mesh.

In the invention, the top of the supporting steel plate is welded with a reinforcing mesh embedded in a reinforced concrete beam system structure 3.

It should be noted that, in particular, in implementation, the reinforced concrete beam system structure 3 is a regular hexagonal prism-shaped structure, and the concrete main body (regular hexagonal prism-shaped) includes an upper layer of prestressed reinforcements and a lower layer of prestressed reinforcements, each layer of prestressed reinforcements may include three prestressed reinforcements, each prestressed reinforcement is located on a diagonal line of the reinforced concrete beam system structure 3, and of course, any plurality of prestressed reinforcements may be disposed in other positions as needed. The prestressed reinforcement (steel strand) serves to make the reinforced concrete beam system 3 more resistant to bending and load.

Of course, it should be noted that the reinforced concrete beam system structure 3 further has a reinforcing mesh formed by fixedly connecting a plurality of common reinforcing bars in the concrete main body (regular hexagon structure) for restricting the use of concrete. The reinforcing mesh is a frame formed by binding a plurality of reinforcing steel bars together, and is commonly called reinforcing mesh. The reinforcing mesh is a common reinforcing mesh structure in reinforced concrete, and is not described in detail herein.

In the invention, at least one of the three structures of the steel ladle concrete inclined strut 4, the steel inner truss 7 and the steel outer truss 8 can be selected and matched according to the environment and the load condition for the truss combined type steel-concrete cylindrical wind power foundation provided by the invention.

The first embodiment.

Fig. 1a to 1b are respectively a perspective view, a front view, and a top view of a truss combined type steel-concrete cylindrical wind power foundation provided by the invention, in a first embodiment, when a steel inner truss is installed.

Referring to fig. 1a to 1b, in the present invention, in a concrete-filled ladle upright transition section 5 and a steel upright transition section 6, vertically distributed steel inner trusses 7 are installed in the inner cavities;

the whole steel inner truss 7 is of a steel structure.

In the concrete implementation, the lower part of the steel inner truss 7 is welded with a steel shell on the inner side surface of the concrete side wall (namely the concrete side wall) around the ladle concrete upright transition section 5;

the middle part and the upper part of the steel inner truss 7 are welded with the inner side surface of the steel upright transition section 6.

In the concrete implementation, the steel inner truss 7 can be arranged in 2-20 layers, and each layer is 3-6 m high.

Example two.

Fig. 2a to 2b are schematic perspective, front view and top view structural diagrams of a truss combined type steel-concrete cylindrical wind power foundation provided by the invention, respectively, in a second embodiment, when a steel outer truss is installed;

referring to fig. 2a to 2b, in the present invention, in a specific implementation, steel outer trusses 8 are installed around outer walls of the ladle concrete upright transition section 5 and the steel upright transition section 6;

the whole steel outer truss 8 is of a steel structure;

the central point of the steel outer truss 8 and the central points of the steel ladle concrete upright transition section 5 and the steel upright transition section 6 are positioned on the same central axis.

In the concrete implementation, the upper part of the steel outer truss 8 is welded with the outer wall of the lower part of the steel upright transition section 6;

the middle part and the lower part of the steel outer truss 8 are welded with the steel shell on the outer side surface of the concrete side wall (namely the concrete side wall) around the ladle concrete upright transition section 5.

In concrete implementation, the bottom of the steel outer truss 8 is welded with a steel bar structure arranged in the concrete main body of the reinforced concrete beam system structure 3.

In the concrete implementation, the steel outer truss 8 can be arranged in 2-6 layers, and each layer is 3-6 m high.

Example three.

Fig. 3a to 3b are schematic perspective, front view and top view structural diagrams of a truss combined type steel-concrete tubular wind power foundation provided by the invention, in a third embodiment, when a steel outer truss and a steel inner truss are installed;

referring to fig. 3a to 3b, in the present invention, vertically distributed steel inner trusses 7 are installed in the inner cavities of the ladle concrete upright transition section 5 and the steel upright transition section 6;

the outer walls of the steel ladle concrete upright transition section 5 and the steel upright transition section 6 are provided with steel outer trusses 8 in a surrounding way;

the steel inner truss 7 and the steel outer truss 8 are both of steel structures;

the central point of the steel outer truss 8 and the central points of the steel ladle concrete upright transition section 5 and the steel upright transition section 6 are positioned on the same central axis.

In the concrete implementation, the lower part of the steel inner truss 7 is welded with a steel shell on the inner side surface of the concrete side wall (namely the concrete side wall) around the ladle concrete upright transition section 5;

the middle part and the upper part of the steel inner truss 7 are welded with the inner side surface of the steel upright transition section 6.

In the concrete implementation, the upper part of the steel outer truss 8 is welded with the outer wall of the lower part of the steel upright transition section 6;

the middle part and the lower part of the steel outer truss 8 are welded with the steel shell on the outer side surface of the concrete side wall (namely the concrete side wall) around the ladle concrete upright transition section 5.

In the concrete implementation, the steel inner truss 7 can be arranged in 2-20 layers, and each layer is 3-6 m high.

In concrete implementation, the bottom of the steel outer truss 8 is welded with a steel bar structure arranged in the concrete main body of the reinforced concrete beam system structure 3.

In the concrete implementation, the steel outer truss 8 can be arranged in 2-6 layers, and each layer is 3-6 m high.

Example four.

Fig. 4a to 4b are schematic perspective, front and top views of a truss combined type steel-concrete tubular wind power foundation provided by the invention, in a fourth embodiment, when a steel inner truss and a ladle concrete inclined supporting beam are installed;

referring to fig. 4a to 4b, in the present invention, vertically distributed steel inner trusses 7 are installed in the inner cavities of the ladle concrete upright transition section 5 and the steel upright transition section 6;

the whole steel inner truss 7 is of a steel structure;

the steel shells on the outer side surface of the upper part of the ladle concrete upright transition section 5 are respectively welded with the top ends of a plurality of (for example, 3 to 12) ladle concrete inclined supporting beams 4 at equal intervals;

the bottom ends of the ladle concrete inclined supporting beams 4 are respectively welded with the steel bar structures arranged in the concrete main bodies of the reinforced concrete beam system structures 3 at the tops (preferably the tops at the edges and corners) of the ladle concrete cylindrical skirts 1 at equal intervals.

In concrete realization, the ladle concrete inclined supporting beam 4 is obliquely arranged, and the included angle between the middle main body part and the horizontal plane is 30-75 degrees.

In the concrete implementation, the lower part of the steel inner truss 7 is welded with a steel shell on the inner side surface of the concrete side wall (namely the concrete side wall) around the ladle concrete upright transition section 5;

the middle part and the upper part of the steel inner truss 7 are welded with the inner side surface of the steel upright transition section 6.

In the concrete implementation, the steel inner truss 7 can be arranged in 2-15 layers, and each layer is 3-6 m high.

Example five.

Fig. 5a to 5b are schematic perspective, front and top views of a truss combined type steel-concrete tubular wind power foundation provided by the invention, in a fifth embodiment, when a steel inner truss, a steel outer truss and a ladle concrete inclined support beam are installed;

referring to fig. 5a to 5b, in the present invention, vertically distributed steel inner trusses 7 are installed in the inner cavities of the ladle concrete upright transition section 5 and the steel upright transition section 6;

the outer walls of the steel ladle concrete upright transition section 5 and the steel upright transition section 6 are provided with steel outer trusses 8 in a surrounding way;

the steel inner truss 7 and the steel outer truss 8 are both of steel structures;

the central point of the steel outer truss 8, the central points of the steel ladle concrete upright transition section 5 and the steel upright transition section 6 are positioned on the same central axis;

wherein, the steel shell of the outer side surface of the upper part of the ladle concrete upright transition section 5 is respectively welded with the top ends of a plurality of (for example, 3 to 12) ladle concrete inclined supporting beams 4 at equal intervals;

the ladle concrete diagonal support beam 4 includes a hollow steel pipe (e.g., a square steel pipe), and concrete is poured into the steel pipe to fill a cavity inside the steel pipe.

The bottom ends of the ladle concrete inclined supporting beams 4 are respectively welded with a steel bar structure arranged in the concrete main body of the reinforced concrete beam system structure 3 at equal intervals.

In concrete implementation, the ladle concrete inclined supporting beam 4 is obliquely arranged, and the included angle between the middle part of the ladle concrete inclined supporting beam and the horizontal plane is 30-75 degrees.

In the concrete implementation, the lower part of the steel inner truss 7 is welded with a steel shell on the inner side surface of the concrete side wall (namely the concrete side wall) around the ladle concrete upright transition section 5;

the middle part and the upper part of the steel inner truss 7 are welded with the inner side surface of the steel upright transition section 6.

In the concrete implementation, the upper part of the steel outer truss 8 is welded with the outer wall of the lower part of the steel upright transition section 6;

the middle part and the lower part of the steel outer truss 8 are welded with the steel shell on the outer side surface of the concrete side wall (namely the concrete side wall) around the ladle concrete upright transition section 5.

In the concrete implementation, the steel inner truss 7 can be arranged in 2-15 layers, and each layer is 3-6 m high.

In concrete implementation, the bottom of the steel outer truss 8 is connected with a steel bar structure arranged in the concrete main body of the reinforced concrete beam system structure 3.

In the concrete implementation, the steel outer truss 8 can be arranged in 2-6 layers, and each layer is 3-6 m high.

In the fifth embodiment, the height of the ladle concrete skirt 1 may be 20 m; the wall thickness of concrete in the ladle concrete cylinder skirt main body is 0.35m, and the thickness of the steel shell is 8 mm.

In the fifth embodiment, in the steel-concrete internal-support truss combined type cylindrical foundation, the diameter of the opposite side of the regular-hexagon ladle concrete skirt 1 as the cylindrical foundation is 38 m.

In the fifth embodiment, the height range of the ladle concrete upright transition section 5 is 20 m;

the thickness range of concrete in the main body of the vertical transition section of the ladle concrete is 1 m;

the thickness of the steel shell in the main body of the steel ladle concrete vertical transition section is 15 mm.

In the fifth embodiment, the included angle between the middle main body part of the ladle concrete diagonal support beam 4 and the horizontal plane is 55 degrees.

In the fifth embodiment, the height of the ladle concrete upright transition section 5 can be 20m, and the height of the steel upright transition section 6 can be 40 m.

In the fifth embodiment, the flanges at the bottom of the steel upright transition section 6 and the top of the ladle concrete upright transition section 5 have a diameter of 8.5m and a thickness of 80 mm.

In the fifth embodiment, the steel inner truss 7 can be arranged in 6 layers, each layer is 6m high, and the total height is 36 m. The steel outer truss 8 can be arranged in 5 layers, and each layer is 5m high.

In order to construct the truss combined type steel-concrete cylindrical wind power foundation provided by the invention, the invention also provides a construction method of the truss combined type steel-concrete cylindrical wind power foundation, which specifically comprises the following steps:

firstly, towing the whole hexagonal cylindrical foundation (the truss combined type steel-concrete cylindrical wind power foundation except the steel inner truss 7) to a target sea area where a wind driven generator needs to be installed by using a floating ship;

the hexagonal cylindrical foundation comprises a steel ladle concrete cylindrical skirt 1, a cylindrical skirt inner partition plate 2, a reinforced concrete beam system 3, a steel ladle concrete inclined supporting beam 4, a steel ladle concrete upright transition section 5, a steel upright transition section 6 and a steel outer truss 8, wherein the steel ladle concrete cylindrical skirt 1, the cylindrical skirt inner partition plate 2, the reinforced concrete beam system and the steel ladle concrete inclined supporting beam are installed;

secondly, sinking the hexagonal cylindrical foundation to the seabed by adopting a negative pressure sinking method in a target sea area where the wind driven generator needs to be installed, wherein the overall height of the hexagonal cylindrical foundation is higher than the water depth of the target sea area;

in the invention, the support steel plate is reserved with air extraction holes, the reinforced concrete beam system structure 3 is also reserved with air extraction holes, and the air extraction holes of the support steel plate and the reinforced concrete beam system structure are communicated up and down; the top of the air exhaust hole of the reinforced concrete beam system structure 3 is positioned at the bottom of the inner cavity of the vertical transition section 5 of the ladle concrete.

The negative pressure sinking method is characterized in that a plurality of cabins are divided by a cabin plate 2 in a cylinder skirt through a pump, air and water which do not enter a soil body space are pumped out, a negative pressure space lower than the external air pressure is formed in the space, and the internal and external pressure difference forms driving force, so that a foundation is sunk, and engineering mechanical equipment for assisting sinking is reduced.

The negative pressure sinking method is the prior art, and can refer to the Chinese patent application of negative pressure control device for barrel-type foundation sinking and the use method thereof, with the publication number of CN 106436786A; and refer to the Chinese patent application for 'a composite cylinder type foundation sinking attitude feed control system', the patent application publication number is CN 106988335A; reference may also be made to the Chinese patent application for a steel-concrete composite cylindrical foundation structure and a construction method thereof, which is published under the number CN 102877478A.

And thirdly, placing the steel inner truss 7 prefabricated on land into the inner cavities of the steel ladle concrete upright transition section 5 and the steel upright transition section 6 from top to bottom through the top opening of the steel upright transition section 6, and then welding the steel inner truss 7 with the steel ladle concrete upright transition section 5 and the steel upright transition section 6, thereby completing the construction of the truss combined type steel-concrete cylindrical wind power foundation.

In the present invention, it should be noted that the steel upright transition piece 6, which is a part of the tower, is a conventional support structure for the wind turbine, and is generally used in conjunction with the wind turbine at the top. The installation mode of the tower and the wind driven generator can adopt the existing conventional installation mode, is not an innovation point of the patent, and is not described again.

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

1. the combined foundation type that a cylindrical wind power foundation (namely the steel ladle concrete cylindrical skirt 1) and a steel vertical transition section are combined is adopted, compared with the traditional variable-diameter transition section, the combined foundation type has the advantages that the vertical mold is more convenient to erect and the pouring is easier, and the construction efficiency of the cast-in-place can be greatly improved;

2. compared with a large-diameter single-pile wind power foundation, the steel consumption is small, and the cylindrical foundation can be quickly sunk and installed through negative pressure.

As the diameter of the cylindrical foundation is as large as 30-38 m, and the diameter of the existing single pile is as large as 5-8 m, the cylindrical foundation has a large differential pressure action area due to negative pressure inside, and can provide a larger driving force, and the existing single pile wind power foundation has a small diameter and a large soil penetration depth, and is installed in a piling mode in the existing engineering.

3. The steel upright transition section and the ladle concrete upright transition section can be connected through flanges, the flanges are locked and fixed through bolts, and the steel upright transition section and the ladle concrete upright transition section can be assembled through local structures, so that the construction period is shortened, and the construction cost of offshore wind power is reduced.

4. The steel inner truss, the steel outer truss and the steel ladle concrete inclined supporting beam are matched, the combination is selected according to the environment and load conditions, and the steel inner truss structure or the steel outer truss structure can be used as a transition section support under the conditions of a deep water area (the water depth is more than 40m) and a small megawatt (the installed capacity is less than 6 MW). The truss structure transmits part of the load on the transition section to the reinforced concrete beam system 3 more uniformly.

5. The truss structure (comprising the steel inner truss and the steel outer truss) is small in steel consumption, can be prefabricated through a factory, and is integrally hoisted and welded on site. In a deep water area (the water depth is over 40m) and under the condition of small megawatt (the installed capacity is 6-8 MW), a steel inner truss and a steel outer truss are combined to be used as a transition section support.

6. Compared with an inclined supporting structure (namely a ladle concrete inclined supporting beam), the steel outer truss structure has the advantages that the supported height range is larger, the problem that the inclination rate is too large due to large flexibility and insufficient support when the water depth of the transition section is larger is effectively solved, the steel outer truss structure is suitable for the sea area with deeper water depth, and the applicable water depth range of the cylindrical foundation is expanded.

7. In the deep water area (the water depth is over 40m) and under the condition of large megawatt (the installed capacity is more than 8MW), an inclined support (namely a steel ladle concrete inclined support beam) is adopted to be combined with a steel inner truss or the inclined support is combined with the inner truss and the outer truss. The inner truss structure is designed in the steel vertical transition section, so that the horizontal bearing capacity and the anti-overturning capacity of the steel vertical transition section are increased while the wave force is not increased, the steel consumption of the steel vertical transition section is reduced, and the material performance of steel is fully exerted.

In the invention, for the truss combined type steel-concrete cylindrical wind power foundation provided by the invention, except that the truss structure (comprising the steel inner truss 7 and the steel outer truss 8) adopts Q235 steel, the steel used in the other structures is Q345 steel.

It should be noted that the wind turbine foundation with insufficient bending rigidity and anti-overturning capability aims at the existing wind turbine foundation, and the new body designed by the invention meets the bending resistance and anti-overturning conditions under large megawatt and large water depth.

The size of a large megawatt foundation is increased, and the amount of structural steel is increased; the structure is higher and the slenderness ratio is increased along with the development to deep water, and the bending rigidity is not enough and the anti-overturning capability is not enough because the traditional offshore wind power foundation is a standard high-rise flexible structure. The invention can achieve the purpose of saving steel consumption by adopting a concrete structure to replace part of a steel structure. In addition, for the invention, the wall thickness of the steel transition section (comprising the steel inner truss 7 and the steel outer truss 8) is effectively reduced through the use of the trusses, the existing single pile manufacturing technology (the wall thickness exceeds 150mm) is not mature at present, and the truss structure designed by the invention supports and protects the upper flexible structure in the wind power foundation, so that steel can be saved, the manufacturing difficulty can be further reduced, and the rigidity of the structure can be increased.

Compared with the prior art, the truss combined type steel-concrete cylinder type wind power foundation provided by the invention is scientific in design, has higher bending rigidity and good anti-overturning capability, can better meet the installation requirement of a deepwater large-capacity wind power generator, and has great practical significance.

Through inspection, the invention can meet the installation requirement of a wind driven generator with large megawatt (for example, the installed capacity is more than 8MW) in a deep water area (for example, the water depth is more than 40 m).

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (10)

1. A truss combined type steel-concrete cylindrical wind power foundation is characterized by comprising a horizontally placed steel ladle concrete cylindrical skirt (1);

wherein a reinforced concrete beam system structure (3) is poured above the ladle concrete skirt (1);

the center of the top of the reinforced concrete beam system structure (3) is fixedly connected with a vertically distributed ladle concrete upright transition section (5);

the top of the steel ladle concrete upright transition section (5) is connected with the bottom of the steel upright transition section (6);

wherein the ladle concrete upright transition section (5) and the steel upright transition section (6) are hollow cylindrical structures;

the top end of the ladle concrete upright transition section (5) is opened;

the upper end and the lower end of the steel upright transition section (6) are respectively provided with an opening;

the top of the ladle concrete upright transition section (5) is communicated with the bottom of the steel upright transition section (6);

the central points of the ladle concrete skirt (1), the ladle concrete upright transition section (5) and the steel upright transition section (6) are positioned on the same central axis.

2. The truss combined type steel-concrete cylindrical wind power foundation as claimed in claim 1, wherein the ladle concrete cylindrical skirt (1) comprises a hollow-inside ladle concrete cylindrical skirt main body in a regular hexagonal prism shape;

the ladle concrete cylindrical skirt main body is a concrete main body which is formed by pouring concrete;

the inner side surface and the outer side surface of the steel ladle concrete cylinder skirt main body are both wrapped with steel shells;

the steel shell positioned on the top of the steel ladle concrete cylinder skirt main body is welded with a layer of horizontally distributed supporting steel plates.

3. The truss combined type steel-concrete cylindrical wind power foundation as claimed in claim 2, wherein a plurality of inner partition plates (2) of the cylindrical skirt are fixedly arranged in the steel ladle concrete cylindrical skirt (1);

the inner partition plates (2) of the cylinder skirt are used for dividing the steel ladle concrete cylinder skirt (1) into a plurality of honeycomb hollow cabins;

the inner partition plate (2) of the cylinder skirt is a steel plate and is welded with a steel shell on the inner side of the bottom of the steel ladle concrete cylinder skirt main body;

for the steel ladle concrete cylindrical skirt (1), the bottom surface of the supporting steel plate is welded with the top of the inner partition plate (2) of the cylindrical skirt;

the steel enclosure baffle plate is characterized in that a circle of steel enclosure baffle plates protruding upwards are welded around the periphery of the top of the support steel plate;

and the reinforced concrete beam system structure (3) is poured on the inner side of the steel fence.

4. The truss combined type steel-concrete cylindrical wind power foundation as claimed in claim 1, wherein the ladle concrete upright transition section (5), which is cylindrical as a whole, comprises a ladle concrete upright transition section main body with a hollow interior;

the ladle concrete upright transition section main body is a concrete main body which is formed by pouring concrete;

the inner side surface and the outer side surface of the concrete side wall at the periphery of the steel ladle concrete upright transition section main body are fixedly wrapped with steel shells;

the whole steel upright transition section (6) is of a cylindrical steel structure;

a flange is welded at the bottom of the steel upright transition section (6), and a flange is welded at the top of the steel ladle concrete upright transition section (5);

the flange at the bottom of the steel upright transition section (6) and the flange at the top of the steel ladle concrete upright transition section (5) are fixedly connected by a plurality of bolts correspondingly penetrating through holes on the flanges.

5. The truss-combined type steel-concrete tubular wind power foundation as claimed in claim 2, wherein the reinforced concrete beam system structure (3) comprises a regular hexagonal prism shaped concrete body in which a steel bar structure is provided

The steel bar structure comprises a plurality of prestressed steel bars and a steel bar mesh;

the top of the supporting steel plate is welded with a reinforcing mesh pre-embedded in the reinforced concrete beam system structure (3).

6. The truss combined type steel-concrete cylindrical wind power foundation as claimed in any one of claims 1 to 5, wherein a vertically distributed steel inner truss (7) is installed in the inner cavities of the ladle concrete upright transition section (5) and the steel upright transition section (6);

the whole of the steel inner truss (7) is of a steel structure;

wherein, the lower part of the steel inner truss (7) is welded with the steel shell on the inner side surface of the concrete side wall around the steel ladle concrete upright transition section (5);

the middle part and the upper part of the steel inner truss (7) are welded with the inner side surface of the steel upright transition section (6).

7. The truss combined type steel-concrete cylindrical wind power foundation as claimed in any one of claims 1 to 5, wherein the outer walls of the ladle concrete upright transition section (5) and the steel upright transition section (6) are provided with steel outer trusses (8) around;

the whole of the steel outer truss (8) is of a steel structure;

the central point of the steel outer truss (8) and the central points of the steel ladle concrete upright transition section (5) and the steel upright transition section (6) are positioned on the same central axis;

wherein, the upper part of the steel outer truss (8) is welded with the lower outer wall of the steel upright transition section (6);

the middle part and the lower part of the steel outer truss (8) are welded with the steel shell on the outer side surface of the concrete side wall around the steel ladle concrete upright transition section (5);

the bottom of the steel outer truss (8) is welded with a steel bar structure arranged in the concrete main body of the reinforced concrete beam system structure (3).

8. The truss combined type steel-concrete cylindrical wind power foundation as claimed in any one of claims 1 to 5, wherein a vertically distributed steel inner truss (7) is installed in the inner cavities of the ladle concrete upright transition section (5) and the steel upright transition section (6);

the outer walls of the steel ladle concrete upright transition section (5) and the steel upright transition section (6) are provided with steel outer trusses (8) in a surrounding way;

the steel inner truss (7) and the steel outer truss (8) are both of steel structures;

the central point of the steel outer truss (8) and the central points of the steel ladle concrete upright transition section (5) and the steel upright transition section (6) are positioned on the same central axis;

the bottom of the steel outer truss (8) is welded with a steel bar structure arranged in the concrete main body of the reinforced concrete beam system structure (3).

9. The truss combined type steel-concrete cylindrical wind power foundation as claimed in any one of claims 1 to 5, wherein a vertically distributed steel inner truss (7) is installed in the inner cavities of the ladle concrete upright transition section (5) and the steel upright transition section (6);

the whole of the steel inner truss (7) is of a steel structure;

the steel shell on the outer side surface of the upper part of the steel ladle concrete upright transition section (5) is respectively welded with the top ends of the plurality of steel ladle concrete inclined supporting beams (4) at equal intervals;

the ladle concrete inclined supporting beam (4) comprises a hollow steel pipe, concrete is poured into the steel pipe, and a cavity in the steel pipe is filled with the concrete;

the bottom ends of the ladle concrete inclined supporting beams (4) are respectively welded with a steel bar structure arranged in a concrete main body of the reinforced concrete beam system structure (3) at equal intervals;

the ladle concrete inclined supporting beam (4) is obliquely arranged, and the included angle between the middle part main body part and the horizontal plane is 30-75 degrees.

10. The truss combined type steel-concrete cylindrical wind power foundation as claimed in any one of claims 1 to 5, wherein a vertically distributed steel inner truss (7) is installed in the inner cavities of the ladle concrete upright transition section (5) and the steel upright transition section (6);

the outer walls of the steel ladle concrete upright transition section (5) and the steel upright transition section (6) are provided with steel outer trusses (8) in a surrounding way;

the steel inner truss (7) and the steel outer truss (8) are both of steel structures;

the central point of the steel outer truss (8) and the central points of the steel ladle concrete upright transition section (5) and the steel upright transition section (6) are positioned on the same central axis;

wherein, the steel shell on the outer side surface of the upper part of the ladle concrete upright transition section (5) is respectively welded with the top ends of the ladle concrete inclined supporting beams (4) at equal intervals;

the ladle concrete inclined supporting beam (4) comprises a hollow steel pipe, concrete is poured into the steel pipe, and a cavity in the steel pipe is filled with the concrete;

the bottom ends of the ladle concrete inclined supporting beams (4) are respectively welded with a steel bar structure arranged in the concrete main body of the reinforced concrete beam system structure (3) at equal intervals.

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