CN210797617U - Pile barrel composite truss type offshore wind turbine foundation - Google Patents

Abstract

The utility model discloses a pile-tube composite truss-type offshore fan foundation. The pile-tube composite truss-type offshore fan foundation comprises a truss structure, a suction tube and a pile foundation, and the suction tube is connected with the bottom of the truss structure. The suction cylinder is provided with an embedded sleeve for installing the pile foundation. The insert sleeve is located in the barrel of the suction barrel, on the barrel edge or outside the barrel. The pile-tube composite truss type offshore wind turbine foundation provided by the utility model can ensure that the structure of the offshore wind turbine foundation has higher stability and bearing capacity, can better withstand extreme loads such as typhoons, and has strong seabed adaptability.

Description

A pile-tube composite truss type offshore wind turbine foundation

technical field

The utility model relates to the field of offshore wind power engineering, in particular to a pile-tube composite truss type offshore wind turbine foundation.

Background technique

As a renewable energy source, offshore wind power has been vigorously researched and promoted by countries all over the world in recent years. The negative pressure cylinder (suction cylinder) is a large-diameter cylindrical thin-walled structure. As a mooring and basic form, the negative pressure cylinder has been widely used in marine structure mooring systems, marine foundation platforms and marine wind turbines. , has the advantages of simple assembly, high construction efficiency and low cost.

For example, the Chinese patent document with the publication number CN109914460A discloses a novel suction cylinder-type combined structure wind power foundation suitable for shallow seas, which relates to the technical field of wind power generation. The system includes central piles, suction cylinders, cylinder walls, roofs, sub-silo slabs, steel stiffeners, tower connections and studs. The suction cylinder is enclosed by a cylinder wall and a top cover, and three sub-silo boards are arranged in the cylinder to form a suction cylinder cavity. The cylinder wall, top cover and sub-silo board are all made of double-layer steel plate concrete, and the steel plate and the concrete are welded with studs to strengthen the connection. The central pile is made of solid steel tube concrete or empty steel tube. A tower connection section is arranged on the upper part of the top cover, and steel stiffeners are arranged along the circumferential direction, and the steel stiffeners are closely connected with the top cover and the tower connection section. For example, a Chinese patent document with publication number CN109853609A discloses an offshore wind power combination foundation. The offshore wind power composite foundation includes jacket, steel pipe pile, suction drum and steel cable. The offshore wind power combined foundation of the utility model is composed of a jacket, a steel pipe pile, a suction cylinder and a steel cable. The jacket and the suction cylinder are connected by a steel cable, and the steel cable can exert its high-strength tensile capacity and increase the side of the combined foundation. The vertical stiffness of the jacket, the vertical load of the jacket, the horizontal load of the fan and the wave flow force of the jacket are transmitted to the suction cylinder through the steel cable to jointly bear. Since the suction cylinder is dispersed and embedded in the topsoil, the contact area with the topsoil foundation is large, which can fully Give full play to the horizontal resistance of the surface soil, improve the horizontal bearing performance of the foundation pile, improve the anti-overturning ability of the foundation, and reduce the pulling force of the main leg of the jacket, thereby reducing the distance of the main leg of the jacket and the section of the rod, reducing the foundation cost and construction difficulty. The suction cylinder can be lowered by negative pressure, and the construction difficulty is small.

In the field of offshore wind power, three or more suction cylinders are generally connected to the truss-type steel frame to form the foundation of the suction cylinder-type truss fan. The foundation is limited by the seabed geological conditions of the installation sea area, and is suitable for installation in areas with relatively stable geological structures. During the installation process, multiple cylinders must sink at the same time, and the suction cylinder foundation needs to control the suction cylinder to sink to the design depth during the sinking process. , In the process of sinking, it is necessary to precisely control the verticality of the structure and the horizontality of the overall superstructure. And with the increase of water depth, the soil plug is easy to form bulge or even buckling in the cylinder, so that the suction cylinder cannot completely sink to the design depth at the same time, and it is difficult to ensure the levelness of the structure, which is also the current suction cylinder truss foundation in the process of use. difficulty.

Utility model content

The purpose of the utility model is to provide a pile-tube composite truss type offshore wind turbine foundation, which can ensure that the structure of the offshore wind turbine foundation has higher stability and bearing capacity, is more resistant to extreme loads such as typhoons, and has strong seabed adaptability.

The utility model provides the following technical solutions:

A pile-tube composite truss-type offshore fan foundation, the pile-tube composite truss-type offshore fan foundation includes a truss structure, a suction tube and a pile foundation, the suction tube is connected with the bottom of the truss structure, and the suction tube is on the bottom of the truss structure. There is an embedded sleeve for installing the pile foundation.

The insert sleeve is located in the barrel of the suction barrel, on the barrel edge or outside the barrel. Both ends of the embedded sleeve are open, and the position, length and cylinder diameter of the embedded sleeve are determined according to actual conditions. The embedded position of the sleeve should consider the overall strength of the structure and facilitate the installation of the suction cylinder. Generally, it should be kept away from the position of the legs as far as possible. From the perspective of ensuring the sealing of the suction cylinder, the lower end is usually higher than the length of the sleeve. The lower end of the suction cylinder. The length of the upper end of the sleeve should be convenient for the pile hammer to carry out piling construction.

A cured grouting layer is arranged between the embedded sleeve and the pile foundation. The pile foundation can be a steel pile or other suitable material and type of pile foundation. The connection and fixation of the embedded sleeve and the pile foundation can be strengthened through the grouting layer.

When the embedding sleeve is located in the cylinder and the edge of the suction cylinder, the suction cylinder is provided with a reinforcing member for supporting the suction cylinder and connecting the suction cylinder and the embedding sleeve. Reinforcing members usually use stiffeners made of steel plates, H-beams, and T-beams.

The top of the suction cylinder is provided with a pump interface for connecting a suction pump or a suction line. The design of the pump interface can refer to the design of the general suction cylinder structure, and determine the interface position from the perspective of ensuring the overall strength of the cylinder body and facilitating the suction cylinder pumping operation.

The truss structure includes a jacket structure for carrying the wind turbine and the tower, and the jacket includes a plurality of jacket legs. The plurality of jacket legs are used to guide the bottom connection form of the pipe frame structure to be three-legged, four-legged or multi-legged. The jacket legs are in one-to-one correspondence with the suction cylinder.

The jacket legs are connected to the top end of the suction drum by stiffening members. Reinforcing members usually use stiffeners made of steel plates, H-beams, and T-beams.

The number of the jacket legs is at least three.

The construction process of the pile-tube composite truss type offshore fan foundation provided by the utility model comprises the following steps:

(1) The truss-type structure and the suction cylinder connected to the bottom of the truss-type structure are hoisted to the seabed, penetrated into the seabed after contacting the seabed until the bottom end of the embedded sleeve is submerged into the soil, and a closed space is formed in the suction cylinder;

(2) The suction cylinder is pumped through the suction pump or suction pipeline, so that the suction cylinder sinks to the specified elevation. After reaching the specified elevation, the suction pump is shut down, and the pump interface is sealed by the cover plate or grouting measures to complete the suction cylinder. Install;

(3) After the suction cylinder is installed, insert the pile foundation into the embedded sleeve, and grouting the gap between the pile foundation and the embedded sleeve after the pile sinking is completed.

In step (2), an underwater suction pump can be used, and the pumping operation can be performed after connecting with the pump interface. According to the actual situation, one or more suction pumps can be placed on the top of each suction cylinder, and a centralized control system can be used to control the suction force. The pressure of the pump ensures that the cylinders of multiple suction cylinders sink evenly. It is also possible to use the water suction system to connect the suction line to the pump port 6 at the top of each suction cylinder to operate to make the cylinder sink to a specified elevation.

In step (2), after the suction pump is pumped through the suction pump or suction pipeline, when the suction cylinder does not sink to the specified elevation or does not meet the structural level requirements, use a pile hammer to hit the embedded sleeve to complete the sinking and leveling operations .

In step (3), by grouting the gap between the pile foundation and the embedded sleeve, the connection strength between the pile foundation and the embedded sleeve can be ensured. The setting of the pile foundation can also increase the bearing capacity of the entire offshore wind turbine foundation.

The pile-tube composite truss type offshore fan foundation provided by the utility model mainly utilizes the frictional force of the outer side of the suction cylinder, the outer side of the embedded sleeve, the outer side of the steel pile and the soil, and the pressure difference inside and outside the suction cylinder to resist External loads to which the structure is subjected.

The utility model provides a truss-type fan foundation of a mixed type of suction cylinder and pile foundation, and proposes a method and technology that facilitates offshore construction. The offshore fan foundation and construction process provided by the utility model can effectively ensure that the suction cylinder sinks to the seabed according to the design depth; once the geology is strong or there is an impermeable layer, the construction cannot be carried out to the design depth due to its own weight and negative pressure. Embedded casing, the external force of the construction hammer acts on the embedded casing structure, and the overall structure is constructed to the design depth; in order to improve the bearing capacity and long-term stability of the structure, the pile foundation can be inserted inside the embedded casing and connected by grouting Pile foundation and embedded casing. The pile-tube composite truss type offshore wind turbine foundation provided by the utility model can ensure that the foundation structure has higher stability and bearing capacity, can better withstand extreme loads such as typhoons, and has strong seabed adaptability, simple installation, low cost, and repeatability. Taking advantage of such advantages, it has broad application prospects.

Compared with the traditional suction tube foundation and pile foundation structure, the advantages and innovations of the pile tube composite truss foundation are as follows:

1) The seabed has strong adaptability: it can be used not only for sandy soil, but also for sandy soil and clay multi-layered geology, as well as for construction with thick soft soil covering and weak bearing capacity;

2) High foundation reliability: Combines the advantages of traditional steel piles and new suction cylinder foundations to provide sufficient bearing capacity;

3) Convenient construction: The truss structure sits on the seabed by itself, without the need for an auxiliary platform or an auxiliary structure to stabilize the truss foundation.

Description of drawings

Fig. 1 is the structural schematic diagram of the pile-tube composite truss type offshore wind turbine foundation provided by embodiment 1;

Fig. 2 is the structural representation of the suction cylinder and pile foundation provided by embodiment 1;

3 is a schematic plan view of the suction cylinder and the pile foundation provided in Example 1;

4 is a schematic structural diagram of a pile-tube composite truss-type offshore wind turbine foundation provided in Example 2;

Fig. 5 is the structural representation of the suction cylinder and pile foundation provided by embodiment 2;

6 is a schematic plan view of the suction cylinder and the pile foundation provided by Embodiment 2;

7 is a schematic structural diagram of a pile-tube composite truss-type offshore wind turbine foundation provided in Example 3;

8 is a schematic structural diagram of a suction cylinder and a pile foundation provided in Example 3;

FIG. 9 is a schematic top view of the suction cylinder and the pile foundation provided in Example 3. FIG.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model more clearly understood, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and do not limit the protection scope of the present invention.

Example 1

The pile-tube composite truss-type offshore wind power infrastructure provided in this embodiment is shown in Figures 1-3, and consists of two parts, the upper truss structure 1, and the lower suction tube and pile foundation combined part.

The truss structure 1 includes: any jacket structure that can be used to carry the wind turbine and the tower, and the bottom connection form of the jacket is three jacket legs.

The structure of the combined part of the suction cylinder 3 and the pile foundation 4 includes: a cylindrical thin-walled suction cylinder 2 with an opening at the bottom, and the top end of the suction cylinder 2 and the jacket legs are connected by a reinforcing member 7. The suction cylinder 2 is provided with an embedded sleeve 3 for installing the pile foundation 4. The embedded sleeve 3 is connected with the suction cylinder 2 through a reinforcing member 8. Both ends of the embedded sleeve 3 are open. The position, length and cylinder diameter of the embedded sleeve are based on According to the actual situation, a reinforcing member 8 is also provided inside the suction cylinder 2 to ensure the connection between the suction cylinder 2 itself and the suction cylinder 2 and the embedded sleeve 3 . The pile foundation 4 can be driven into the seabed through the embedded sleeve 3 to increase the bearing capacity of the foundation structure, and the pile foundation 4 and the embedded sleeve 3 are connected through the grouting layer 5 . The top of the suction cylinder 3 is provided with a pump interface 6 for connecting the underwater suction pump.

Example 2

The pile-tube composite truss-type offshore wind power foundation provided in Example 1 is different from Figures 4-6, except that the suction tube 2 is provided with an embedded sleeve 3 at the tube edge. The barrel edge means that the suction barrel 2 is tangent to the embedded sleeve 3 .

Example 3

The pile-tube composite truss-type offshore wind power foundation provided in Example 1 and Figures 7-9, the difference is that the suction tube 2 is provided with an embedded sleeve 3 outside the tube, and the suction tube 2 does not need to be provided with an embedded sleeve. 3 Connected reinforcement members.

The construction technology of the pile-tube composite truss type offshore wind turbine foundation provided by embodiment 1-3 comprises the following steps:

(1) The truss-type structure and the suction cylinder connected to the bottom of the truss-type structure are hoisted to the seabed, penetrated into the seabed after contacting the seabed until the bottom end of the embedded sleeve is submerged into the soil, and a closed space is formed in the suction cylinder;

(2) The suction cylinder is pumped through the underwater suction pump, so that the suction cylinder sinks to the specified elevation. After reaching the specified elevation, the suction pump is shut down, and the pump interface is sealed by the cover plate or grouting measures to complete the installation of the suction cylinder. ;When the suction cylinder does not sink to the specified elevation or does not meet the structural level requirements after the suction cylinder is pumped by the underwater suction pump, use the pile hammer to hit the embedded sleeve to complete the sinking and leveling operation;

(3) After the suction cylinder is installed, insert the pile foundation into the embedded sleeve, and grouting the gap between the pile foundation and the embedded sleeve after the pile sinking is completed.

The above-mentioned specific embodiments describe in detail the technical solutions and beneficial effects of the present invention. It should be understood that the above are only the most preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, additions and equivalent replacements made within the scope of the principles of the utility model shall be included within the protection scope of the present utility model.

Claims (8)

1. The utility model provides a compound truss-like offshore wind turbine basis of a pile section of thick bamboo, its characterized in that, compound truss-like offshore wind turbine basis of a pile section of thick bamboo includes truss-like structure, a suction section of thick bamboo and pile foundation, a suction section of thick bamboo is connected with truss-like structure's bottom, be equipped with the embedding sleeve of installation pile foundation on the suction section of thick bamboo.

2. The pile-casing composite truss offshore wind turbine foundation of claim 1, wherein the embedment sleeve is located inside, at a casing rim, or outside of a suction casing.

3. The pile-barrel composite truss offshore wind turbine foundation of claim 2, wherein a cured grout blanket is disposed between the embedment sleeve and the pile foundation.

4. The pile-casing composite truss offshore wind turbine foundation of claim 2, wherein when the embedment sleeve is located within and at a casing edge of the suction casing, a reinforcement member is provided within the suction casing for supporting the suction casing and the connection of the suction casing to the embedment sleeve.

5. The pile-barrel composite truss offshore wind turbine foundation of claim 1, wherein the top end of the suction barrel is provided with a pump interface for connecting a suction pump or a suction line.

6. The pile-tubular composite truss offshore wind turbine foundation of claim 1, wherein the truss structure includes a jacket structure for carrying a wind turbine and a tower, the jacket including a plurality of jacket legs.

7. The pile-barrel composite truss offshore wind turbine foundation of claim 6, wherein the duct frame legs are connected to the top end of the suction barrel by a stiffening member.

8. The pile-barrel composite truss offshore wind turbine foundation of claim 6, wherein the number of conduit frame legs is at least three.

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