Single-pile foundation and construction method for offshore wind power generation

Abstract

To provide a single pile foundation for offshore wind power generation that protects the seabed soil layer and structure of a single pile for wind power generation, reduces the impact of water currents to protect the foundation of equipment, improves safety and lifespan, and improves load-bearing capacity.SOLUTION: A single pile foundation for offshore wind power generation includes a floating engagement tank, a soil cement expansion pipe, and a reinforcing structure. One end of the soil cement expansion pipe is connected to the floating engagement tank, and the other end of the soil cement expansion pipe is connected to the reinforcing structure. The reinforcing structure includes an inner sleeve, a rib plate, and a steel net. The rib plate is arranged in an annular shape on the outer wall of the inner sleeve and is provided radially outward. The steel net is also provided in an annular shape around the outer wall of the inner sleeve.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power generation, and specifically relates to a single-pile foundation for offshore wind power generation and a construction method therefor.

Background Art

[0002] The single-pile foundation for offshore wind power generation is a structural form that is relatively widely used in offshore wind power generation because of its high bearing capacity, uniform settlement, and ease of construction. However, when a single pile is installed, the original balance state between the original water flow and scouring near the sand bed is disrupted, and the ground and soil around the pile are partially scoured, seriously threatening the normal operation of the offshore wind power generation system.

[0003] Measures to prevent scouring of single piles mainly include dumped stones, sand packs, solidified treated soil, and bionic grass, etc. The scouring protection by solidified treated soil has advantages such as excellent scouring resistance, good adhesion to the pile foundation, good structural integrity, quick construction, efficiency, safety, reliability, good water resistance and durability, etc., and has significant advantages for scouring protection on silty seabeds. However, when using a single-pile foundation in a place where the mechanical properties of the surface soft soil are inferior, such as when the surface silt soft layer is thick and the sand layer is thin or there is no sand layer, the amount of steel structure used will increase.

[0004] Based on the current situation of the above works, if it is possible to renovate based on the conventional scouring prevention structure and combine it with the reinforcement measures of the single-pile foundation while ensuring the scouring prevention effect, it will have important significance for cost reduction and efficiency improvement of offshore wind power generation.

[0005] Patent Document 1 discloses a single-pile foundation for offshore wind power generation. This single-pile foundation includes an excavation box, excavation nails, and a lateral insertion assembly. The excavation nails allow the pile to be inserted more easily into the seabed soil, and once it has been inserted to a certain depth, the lateral insertion fixing assembly is extended and inserted horizontally into the soil. This makes it possible to firmly attach the single pile to the seabed, improving the stability and horizontal rigidity of the single pile.

[0006] Patent Document 2 discloses a scour prevention structure for a single-pile foundation of an offshore wind power generation system. This scour prevention structure, upon impact with seawater, buffers the seawater through water passages, allows it to permeate into the crushed stone along the water passages, and then disperses the seawater with the crushed stone. It also has a support conical ring inside the support sleeve, which supports the steel pipe single pile so that it maintains its vertical position without being affected. Furthermore, by blocking it with a concrete bottom plate and allowing seawater to seep out from the outside of the foundation pit, it is possible to effectively avoid the situation in which the single-pile foundation is exposed to the seabed. This further stabilizes the single-pile foundation and reliably guarantees the safe operation of the offshore wind power generation system.

[0007] Patent Document 3 discloses a scour prevention device for a single pile foundation of an offshore wind power generation facility. The scour prevention device is installed on the outside of a steel pipe pile and includes an external ring frame, an expandable sleeve, and a geotextile. The expandable head pipe and expandable tail pipe are connected and fixed to expand and contract by a watertight hose. The inside of the geotextile is fixedly connected to an adjacent expandable head pipe, and the outside of the geotextile is fixedly connected to an adjacent expandable tail pipe. Several groups of bionic glass, uniformly distributed, are fixedly attached to the geotextile. This achieves scour prevention and scour energy dissipation around the single pile foundation of an offshore wind power generation facility.

[0008] Patent Document 4 discloses a scour prevention structure for a single pile foundation of an offshore wind power generation system. This scour prevention structure includes sandbags, sand packs, and a scour prevention assembly. The sandbags are used to surround and fix the single pile, and the sand packs are laid on top of the sandbags. The scour prevention assembly is provided on top of the sand packs to fix the sand packs and sandbags together. This makes it possible to fix the sandbags and sand packs together, and by avoiding scouring of the sandbags and sand packs by ocean currents, the scour resistance of the sandbags and sand packs is improved, thereby improving the fixing effect of the single pile.

[0009] Patent Document 5 discloses a scour prevention structure for a single pile foundation of an offshore wind power generation system. This scour prevention structure includes sand packs and a deceleration and deposition promotion member that are laid sequentially on the seabed around the outer perimeter of the single pile foundation. The sand packs are annular in shape. The width of the sand packs is 0.5 to 2 times the pile diameter. The deceleration and deposition promotion member is also laid in an annular shape and concentrically around the outer perimeter of the sand packs. The width of the deceleration and deposition promotion member is 0.5 to 3 times the pile diameter.

[0010] Patent document 6 discloses a scour prevention structure for a single-pile foundation of a wind power generator that can cultivate marine crustaceans, diversifying the function of the structure. This structure enables the cultivation of shrimp and crabs while protecting the foundation of the wind turbine. This structure mimics the habitat of shrimp and crabs. The device is located on the seabed and has caves where shrimp and crabs can hide.

[0011] The conventional technology described above cannot guarantee the scouring prevention effect of single-pile foundations while simultaneously reinforcing the foundation. Therefore, further improvements are needed to overcome these technical shortcomings. [Prior art documents] [Patent Documents]

[0012] [Patent Document 1] Chinese Utility Model Specification No. 218492549U [Patent Document 2] Chinese Utility Model Specification No. 218437164U [Patent Document 3] Chinese Patent No. 114606985B Specification [Patent Document 4] Chinese Utility Model Specification No. 218233551U [Patent Document 5] Chinese Utility Model Specification No. 219011322U [Patent Document 6] Chinese Utility Model Specification No. 219330425U [Overview of the project] [Problems that the invention aims to solve]

[0013] In view of the above, the object of the present invention is to provide a single-pile foundation for offshore wind power generation that protects the seabed soil layer and structure of the single pile of the wind power generation, reduces the impact of water flow to protect the foundation of the equipment, improves safety and lifespan, and improves load-bearing capacity. [Means for solving the problem]

[0014] This invention aims to solve one of the problems in the background technology.

[0015] In order to achieve the above-mentioned objectives and other related objectives, the present invention provides the following technical details.

[0016] The single-pile foundation for offshore wind power generation includes a floating engagement tank, a soil-cement expansion joint, and a reinforcing structure. One end of the soil-cement expansion joint is connected to the floating engagement tank, and the other end of the soil-cement expansion joint is connected to the reinforcing structure. The reinforcing structure includes an inner sleeve, rib plates, and a steel net. The rib plates are arranged in an annular pattern on the outer wall of the inner sleeve and are also provided radially outward. The steel net is also provided in an annular pattern around the outer wall of the inner sleeve.

[0017] The technical content provided by the present invention further has the following technical features.

[0018] Preferably, the floating engagement groove is a circular ring. The floating engagement groove is covered on the outer wall of the single-pile pipe by the circular ring. Four horizontal sliding paths are arranged in the circumferential direction on the circular ring of the floating engagement groove.

[0019] Preferably, a soil-cement expansion pipe is arranged at the intersection of the horizontal sliding path and the floating engagement groove.

[0020] Preferably, the inner diameter of the inner sleeve is larger than the outer diameter of the single-pile pipe.

[0021] Preferably, the inner sleeve has To achieve uniform flow of soil cement Four apertures are uniformly arranged in the circumferential direction. At each aperture position, a pair of , open The rib plates are provided facing outward. Also, the ends of each pair of the rib plates are fixedly connected to each other.

[0022] Preferably, the ends of each pair of the rib plates are connected by a vertical plate.

[0023] Preferably, the rib plate is provided with mounting holes for a steel net. Also, the rib plate is provided with flow holes. The flow holes are located above the steel net.

[0024] Preferably, horizontal slide rails are provided inside each pair of the rib plates. Also, a joint is provided at the bottom of the soil-cement expansion pipe. The joint is provided with a concave groove adapted to the horizontal slide rail.

[0025] Preferably, the height of the horizontal slide rail of the rib plate is higher than the discharge and filling height of the soil-cement.

[0026] Preferably, the steel net is two layers. Also, there are four flow holes, which are uniformly arranged at the central part of the rib plate.

[0027] The construction method for single-pile foundations for offshore wind power generation includes steps 1 through 8.

[0028] In step 1, the reinforcing structure is assembled on land by welding, one end of the soil cement expansion joint is connected to the floating engagement tank, and the other end is connected to the engagement groove in the rib plate of the reinforcing structure.

[0029] In step 2, the single pile foundation is settled.

[0030] In step 3, the soil-cement expansion joint on the floating engagement tank is connected to the solidified soil discharge and filling pipe of the construction vessel.

[0031] In step 4, the floating engagement tank and the inner sleeve of the reinforcing structure are lowered to a predetermined position along the pile head of the single pile foundation.

[0032] In step 5, The internal space formed by the pair of rib plates The solidified soil is then discharged and filled into the container.

[0033] In step 6, after the solidified soil has been discharged and filled to the design elevation, the discharge and filling pipe of the solidified soil on the construction vessel is disconnected from the soil-cement expansion joint.

[0034] In step 7, the soil-cement expansion joint on the floating engagement tank is slid along the horizontal sliding path, moving the joint at the bottom of the soil-cement expansion joint along the horizontal sliding rail until it disengages from the horizontal sliding rail.

[0035] In step 8, the soil-cement expansion joint and the floating engagement tank are lifted to the construction vessel for use in the next single-pile foundation. [Effects of the Invention]

[0036] The present invention has the following beneficial effects.

[0037] 1. The solidified soil of the present invention has two effects. Firstly, it provides erosion protection. Secondly, by utilizing the fluidity and later strength of the solidified soil to connect the reinforcing structure of the single pile foundation to the pile foundation, the horizontal load-bearing capacity of the single pile foundation is strengthened. In addition, the amount of work required for the single pile foundation is streamlined and the number of construction steps is reduced, thus lowering construction costs.

[0038] 2. The reinforcing structure of the present invention can be assembled on land on a large scale, thereby reducing the time spent working at sea.

[0039] 3. The soil-cement expansion joint and floating engagement tank of the present invention are reusable and can reduce costs.

[0040] 4. The rib plates of the reinforcing structure improve the horizontal load-bearing capacity of the structure and also allow for the fixing and positioning of the soil-cement expansion joints.

[0041] 5. By providing openings in the rib plates and inner sleeves of the reinforcing structure, uniform flow of soil cement can be achieved, thus guaranteeing the quality of scouring prevention construction using soil cement.

[0042] 6. According to the construction method of the present invention, the entire soil cement discharge and reclamation process can be completed with a single positioning, without the need for the vessel to repeatedly circle around the single pile foundation for positioning.

[0043] 7. By utilizing the fluidity of the solidified soil to integrate it with the surrounding steel structure, the lateral load-bearing capacity is improved. In addition, steel can be saved, and the diameter of the wind turbine piles can be reduced. [Brief explanation of the drawing]

[0044] [Figure 1] This is a perspective view of the floating engagement tank for the single pile foundation of an offshore wind power generation system according to the present invention. [Figure 2] A perspective view of the bottom structure of a single pile foundation for offshore wind power generation according to the present invention. [Figure 3]A perspective view of the reinforcing structure for a single pile foundation of an offshore wind power generation facility according to the present invention. [Figure 4] This is a schematic diagram of the bottom connection of the soil-cement expansion joint for the single pile foundation of an offshore wind power generation system according to the present invention. [Figure 5] This is an exploded view of the bottom connection of the soil-cement expansion joint of the single pile foundation for offshore wind power generation according to the present invention. [Modes for carrying out the invention]

[0045] The following describes specific embodiments of the present invention in more detail, with reference to the drawings. These embodiments are merely illustrative and do not limit the present invention.

[0046] In describing the present invention, the directions or positional relationships indicated by terms such as "center," "vertical," "horizontal," "up," "down," "front," "back," "left," "right," "perpendicular," "horizontal," "ceiling," "bottom," "inside," and "outside" are directions or positional relationships based on the illustrations and are merely for the convenience and simplification of the description of the present invention. They do not explicitly or implicitly suggest that the device or component in question has a specific direction or must be configured and operated in a specific direction. Therefore, they should not be interpreted as limiting the present invention. Furthermore, the terms "first" and "second" are merely for the convenience of description and should not be interpreted as explicitly or implicitly indicating relative importance.

[0047] It should be noted that, unless otherwise explicitly defined and limited, the terms “attach,” “connect,” and “join” in this invention should be interpreted broadly. For example, the connection may be fixed, removable, or integral. It may also be mechanical or electrical. Furthermore, it may be a direct connection, an indirect connection via an intermediate medium, or internal communication between two members. Those skilled in the art will be able to interpret the specific meaning of these terms in this invention according to the specific circumstances.

[0048] Furthermore, unless otherwise specified, the term "multiple" in the description of this invention means two or more.

[0049] As shown in Figures 1 to 5, the single-pile foundation for offshore wind power generation includes a floating engagement tank 1, a soil-cement expansion joint 2, and a reinforcing structure 3. One end of the soil-cement expansion joint 2 is connected to the floating engagement tank 1, and the other end of the soil-cement expansion joint 2 is connected to the reinforcing structure 3. The reinforcing structure 3 includes an inner sleeve 4, rib plates 5, and a steel net 6. The rib plates 5 are arranged in a ring shape on the outer wall of the inner sleeve 4 and are also provided radially outward. The steel net 6 is also provided in a ring shape around the outer wall of the inner sleeve 4.

[0050] The characteristics of the present invention when implemented are as follows: The floating engagement tank 1, soil-cement expansion joint 2, and reinforcing structure 3 are fixed to the single pile pipe 8, and the impact of the water flow is reduced by using a steel net 6, thereby reducing the impact on the equipment. In addition, the rib plate 5 is used to absorb energy and reduce the impact of the water flow. Furthermore, flow holes are provided in the rib plate 5 to reduce the impact of the water flow on the equipment. As a result, the objective of protecting the single pile and reducing scouring is achieved.

[0051] Specifically, the floating engagement tank 1 is a circular ring. The floating engagement tank 1 is covered by the circular ring on the outer wall of the single pile pipe 8. Four horizontal sliding passages 7 are arranged in the circumferential direction within the circular ring of the floating engagement tank 1.

[0052] A soil-cement expansion joint 2 is positioned at the intersection of the horizontal sliding track 7 and the floating engagement tank 1.

[0053] The inner diameter of the inner sleeve 4 is larger than the outer diameter of the single pile pipe 8.

[0054] The inner sleeve 4 has four openings uniformly arranged in the circumferential direction. A pair of rib plates 5 are provided at each opening, facing outwards. The ends of each pair of rib plates 5 are fixedly connected to one another.

[0055] The ends of each pair of rib plates 5 are connected by vertical plates 10.

[0056] The rib plate 5 is provided with mounting holes for the steel net 6. The rib plate 5 is also provided with flow holes. The flow holes are located above the steel net 6.

[0057] A horizontal slide rail 11 is provided inside each pair of rib plates 5. A joint 12 is also provided at the bottom of the soil cement expansion joint 2. The joint 12 has a groove that fits into the horizontal slide rail 11.

[0058] The height of the horizontal slide rail 11 of the rib plate 5 is higher than the height of the soil cement discharge and filling.

[0059] The steel net 6 has two layers. Additionally, there are four flow holes, uniformly distributed in the center of the rib plate 5.

[0060] As shown in Figures 1 to 5, the construction method for single-pile foundations for offshore wind power generation includes steps 1 to 8.

[0061] In step 1, the reinforcing structure 3 is assembled on land by welding, one end of the soil cement expansion joint 2 is connected to the floating engagement tank 1, and the other end is connected to the engagement groove in the rib plate 5 of the reinforcing structure 3.

[0062] In step 2, the single pile foundation is settled.

[0063] In step 3, the soil-cement expansion joint 2 on the floating engagement tank 1 is connected to the solidified soil discharge and filling pipe of the construction vessel.

[0064] In step 4, the inner sleeve 4 of the floating engagement tank 1 and the reinforcing structure 3 is sunk to a predetermined position along the pile head of the single pile foundation.

[0065] In step 5, the solidified soil is discharged and packed into the facility.

[0066] In step 6, after the solidified soil has been discharged and filled to the design elevation, the solidified soil discharge and filling pipe of the construction vessel is disconnected from the soil cement expansion joint 2.

[0067] In step 7, the soil-cement expansion joint 2 on the floating engagement tank 1 is slid along the horizontal sliding path 7, moving the joint 12 at the bottom of the soil-cement expansion joint 2 along the horizontal sliding rail 11 until it disengages from the horizontal sliding rail 11.

[0068] In step 8, the soil-cement expansion joint 2 and the floating engagement tank 1 are lifted to the construction vessel for use in the next single-pile foundation.

[0069] The above description represents only preferred embodiments of the present invention. It should be noted that those skilled in the art may make some improvements and substitutions without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention. [Explanation of Symbols]

[0070] 1. Floating engagement tank 2. Soil cement expansion joint 3. Reinforcement structure 4. Inner sleeve 5 Rib Plate 6 Steel Net 7 Horizontal sliding track 8 Single pile pipe 10 Vertical Plates 11 Horizontal slide rail 12 joints

Claims

1. The structure includes a floating engagement tank (1), a soil-cement expansion joint (2), and a reinforcing structure (3), wherein one end of the soil-cement expansion joint (2) is connected to the floating engagement tank (1), and the other end of the soil-cement expansion joint (2) is connected to the reinforcing structure (3). The reinforcing structure (3) includes an inner sleeve (4), a rib plate (5), and a steel net (6). The rib plates (5) are arranged in an annular pattern on the outer wall of the inner sleeve (4) and are provided radially outward, and the steel net (6) is provided in an annular pattern around the outer wall of the inner sleeve (4). The floating engagement tank (1) is a circular ring, and the floating engagement tank (1) is covered by the circular ring on the outer wall of the single pile pipe (8), and four horizontal sliding passages (7) are arranged in the circumferential direction on the circular ring of the floating engagement tank (1). The soil-cement expansion joint (2) is positioned at the intersection of the horizontal sliding track (7) and the floating engagement tank (1), and the soil-cement expansion joint (2) on the floating engagement tank (1) slides along the horizontal sliding track (7). The inner sleeve (4) has four openings uniformly arranged in the circumferential direction to ensure uniform flow of soil cement, and at each of the opening positions, a pair of perforated rib plates (5) are provided facing outwards, and the ends of each pair of rib plates (5) are fixedly connected to each other, and the inner sleeve (4) covers the outer wall of the single pile pipe (8). A horizontal slide rail (11) is provided inside each pair of the rib plates (5), and a joint (12) is provided at the bottom of the soil cement expansion joint (2), and the joint (12) is provided with a groove that fits the horizontal slide rail (11). A single pile foundation for offshore wind power generation, characterized in that the rib plate (5) is provided with mounting holes for the steel net (6).

2. The single pile foundation for offshore wind power generation according to claim 1, characterized in that the ends of each pair of rib plates (5) are connected by vertical plates (10).

3. The single pile foundation for offshore wind power generation according to claim 1, characterized in that the rib plate (5) is provided with flow holes, and the flow holes are located above the steel net (6).

4. The single pile foundation for offshore wind power generation according to claim 1, characterized in that the height of the horizontal slide rail (11) of the rib plate (5) is higher than the height of the soil cement discharge and filling.

5. The single pile foundation for offshore wind power generation according to claim 3, characterized in that the inner diameter of the inner sleeve (4) is larger than the outer diameter of the single pile pipe (8), the steel net (6) is made of two layers, the flow holes are four in number and are uniformly arranged in the center of the rib plate (5).

6. Using the single pile foundation for offshore wind power generation described in any one of claims 1 to 5, Step 1 involves assembling the reinforcing structure (3) on land by welding, connecting one end of the soil cement expansion joint (2) to the floating engagement tank (1), and connecting the other end to the engagement groove in the rib plate (5) of the reinforcing structure (3), Step 2 involves settling the aforementioned single pile foundation, Step 3 involves connecting the soil cement expansion joint (2) on the floating engagement tank (1) to the solidified soil discharge and filling pipe of the construction vessel, Step 4 involves sinking the inner sleeve (4) of the floating engagement tank (1) and the reinforcing structure (3) to a predetermined position along the pile head of the single pile foundation, Step 5 involves discharging and filling the internal space formed by the pair of rib plates (5), Step 6 involves discharging and filling the solidified soil up to the design elevation, and then disconnecting the solidified soil discharge and filling pipe of the construction vessel from the soil-cement expansion joint (2). Step 7 involves sliding the soil-cement expansion joint (2) on the floating engagement tank (1) along the horizontal sliding path (7) to move the joint (12) at the bottom of the soil-cement expansion joint (2) along the horizontal sliding rail (11) until it detaches from the horizontal sliding rail (11), A method for constructing a single pile foundation for offshore wind power generation, comprising step 8 of lifting the soil cement expansion joint (2) and the floating engagement tank (1) to the construction vessel for use in the next single pile foundation.

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