Offshore wind turbine cylindrical foundation structure and construction method thereof

Abstract

The present invention belongs to the field of offshore wind power technology and provides an offshore wind power cylindrical foundation structure and a construction method thereof. The offshore wind power cylindrical foundation structure comprises a cylindrical foundation body, a spike-shaped structure, a first slideway, a second slideway, a sleeve, and a first airbag device; the spike-shaped structure is arranged at the bottom of the cylindrical foundation body; the first slideway and the second slideway are respectively arranged inside and outside the cylindrical wall of the cylindrical foundation body; the sleeve is sleeved on the outside of the cylindrical wall and can slide along the second slideway; and the first airbag device is arranged inside the cylindrical wall and can slide along the first slideway.

Description

Technical Field

[0001] The present invention belongs to the technical field of offshore wind power, and in particular relates to an offshore wind power cylindrical foundation structure and a construction method thereof. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Currently, in the offshore wind power generation sector, barrel foundations offer advantages such as ease of construction, low cost, and recyclability. Traditional barrel foundations place high demands on the foundation soil, requiring not only the bearing capacity but also considerations such as construction conditions and structural buckling. If the topsoil is too hard, the structure may struggle to sink during suction installation.

[0004] The inventors discovered that during the recovery process, traditional barrel foundations can experience a "water burst" phenomenon due to the sudden release of water trapped within the barrel under suction. This "water burst" phenomenon can cause significant movement in the foundation, hindering the safe lifting of the structure. Furthermore, during transportation, barrel foundations face challenges securing the structure to the transport vessel. Traditional lashing methods are prone to wear and tear, and insecure lashings can easily cause collisions between the barrel and the vessel, compromising structural safety. Summary of the Invention

[0005] In order to solve the technical problems existing in the above-mentioned background technology, the present invention provides an offshore wind power cylindrical foundation structure and a construction method thereof, which can reduce the "water explosion" phenomenon that may occur during recovery and lifting, and improve the safety of the recovery process construction; the airbag device effectively fixes the structure position, which can improve the safety of the structure during transportation and lifting.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A first aspect of the present invention provides an offshore wind turbine cylindrical foundation structure.

[0008] An offshore wind power cylindrical foundation structure, comprising a cylindrical foundation body, a spike-shaped structure, a first slideway, a second slideway, a sleeve, and a first airbag device;

[0009] The spike-shaped structure is arranged at the lower part of the cylindrical basic body;

[0010] The first slideway and the second slideway are respectively arranged inside and outside the cylinder wall of the cylinder-shaped basic body;

[0011] The sleeve is sleeved on the outside of the cylinder wall and can slide along the second slideway;

[0012] The first airbag device is arranged inside the cylinder wall and can slide along the first slideway.

[0013] As an embodiment, a second airbag device is further provided on the outside of the cylindrical wall of the cylindrical basic body, and the second airbag device can slide along a second slideway.

[0014] As an embodiment, the second airbag device is inflated with gas only during transportation.

[0015] As an embodiment, the first airbag device is inflated with gas only during transportation.

[0016] As an embodiment, when the offshore wind power cylindrical foundation structure initially sinks into the mud, the lower part of the casing is flush with the lower end of the spike-shaped structure, and a closed space is formed between the casing, the spike-shaped structure and the soil, and suction is applied to the cylindrical foundation body to achieve suction sinking.

[0017] As an implementation method, after the offshore wind power cylindrical foundation structure is completely buried in the mud, the position of the casing relative to the soil remains unchanged, and the cylindrical foundation body slides downward along the second slideway into the mud.

[0018] A second aspect of the present invention provides a construction method for the offshore wind turbine cylindrical foundation structure as described above.

[0019] A construction method for the above-mentioned cylindrical foundation structure for offshore wind power generation comprises:

[0020] Slide the casing down the second slideway until the lower part of the casing is flush with the lower end of the spike-shaped structure, and lower the cylindrical base body to the mud surface. At this time, the first airbag device and the second airbag device are both raised to the top of the cylindrical base body and are both deflated.

[0021] The offshore wind turbine cylindrical foundation structure is sunk into the mud by its own weight. At this time, the spike structure is not completely immersed in the mud. A closed space is formed between the casing, the spike structure and the soil, and suction is applied to the inside of the cylinder to cause it to sink by suction.

[0022] The offshore wind turbine cylindrical foundation structure continues to sink under the action of suction. At this time, the position of the casing relative to the soil remains unchanged, and the cylinder slides downward relative to the casing along the second slideway into the mud.

[0023] After the offshore wind turbine cylindrical foundation structure is completely buried in the mud, the casing is located on the upper part of the cylinder top cover to form a retaining structure, and stones are thrown onto the upper part of the cylinder top cover for ballasting.

[0024] As an embodiment, before the construction of the offshore wind power cylindrical foundation structure, the following steps are further included:

[0025] The offshore wind turbine cylindrical foundation structure is transported to the installation sea area by a transport ship.

[0026] As an implementation method, the process of transporting the offshore wind turbine cylindrical foundation structure by a transport vessel is as follows:

[0027] The offshore wind turbine cylindrical foundation structure is placed in the groove of the transport ship; wherein the diameter of the groove of the transport ship is the same as the diameter of the cylinder, and a third airbag device is embedded in the groove;

[0028] The first airbag device, the second airbag device and the third airbag device are inflated to fix the offshore wind turbine cylindrical foundation structure to the transport ship.

[0029] As an embodiment, after the construction of the offshore wind power cylindrical foundation structure is completed, the method further includes:

[0030] The offshore wind power cylinder-type foundation structure is recovered, and the first airbag is inflated during the recovery and lifting process, and the first airbag is lowered to the bottom of the cylinder when the cylinder is about to emerge from the water.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] (1) The lower part of the barrel foundation in the present invention has a spike-shaped structure, which is beneficial for sinking construction when the surface soil is hard, and on the other hand, it can reduce the risk of "water explosion" during the recovery and lifting process. When the traditional barrel foundation is lifted out of the water, since the area of the air vent at the top of the barrel is much smaller than the opening area at the bottom of the barrel, there is a certain delay in the air being sucked into the barrel. Therefore, the air pressure inside the barrel will have a suction effect on the water inside the barrel, making the liquid level inside the barrel higher than the external liquid level. When the water is discharged from the bottom of the barrel, the pressure difference between the inside and outside of the barrel disappears, the water in the barrel is suddenly released, and the "water explosion" phenomenon occurs. The "water explosion" phenomenon will increase the motion response of the barrel foundation and increase the risk of the lifting construction process. The presence of the spike-shaped structure at the lower part of the barrel foundation of the present invention makes the area of communication between the water in the barrel and the external atmosphere gradually increase during the water discharge process of the barrel bottom, and the speed of reducing the pressure difference between the inside and outside of the barrel is slowed down, which effectively reduces the occurrence of the "water explosion" phenomenon and improves the safety of the lifting process.

[0033] (2) The present invention is provided with a casing on the outside of the cylindrical foundation, and the casing can move up and down along the second slide. In the initial stage of sinking, the casing is located at the bottom of the cylindrical foundation to form a closed space inside the cylinder, thereby realizing suction sinking. After the sinking is completed, the casing is located at the top of the cylinder and can serve as a retaining structure for stone ballast.

[0034] (3) The present invention uses airbag devices both inside and outside the offshore wind power tube-type foundation structure, which can effectively fix the structural position and improve the safety of the structure during transportation and lifting, ultimately improving the safety of offshore wind power tube-type foundation construction and expanding the applicable foundation soil range of the tube-type foundation.

[0035] Advantages of additional aspects of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0037] Figure 1 This is a schematic diagram of a cylindrical foundation structure according to an embodiment of the present invention;

[0038] Figure 2 Schematic diagram of the first airbag device during transportation of a cylindrical foundation according to an embodiment of the present invention;

[0039] Figure 3 Schematic diagram of the second airbag device during transportation of a cylindrical foundation according to an embodiment of the present invention;

[0040] Figure 4 Schematic diagram of the second airbag device and the transport ship during the transportation of the cylindrical foundation according to an embodiment of the present invention;

[0041] Figure 5 This is a schematic diagram of the initial stage of sinking of a barrel foundation into the mud according to an embodiment of the present invention;

[0042] Figure 6 This is a schematic diagram of the completion of sinking of a barrel foundation according to an embodiment of the present invention;

[0043] Figure 7 This is a schematic diagram of the barrel foundation recovery and lifting process according to an embodiment of the present invention.

[0044] In the figure: 1. Cylindrical foundation; 2. Spike-shaped structure; 3. Second slideway; 4. Casing; 5. First airbag device; 6. Second airbag device; 7. Airbag groove; 8. Transport ship; 9. Groove on the ship; 10. Riprap; 11. Water surface; 12. Water inside the cylinder. DETAILED DESCRIPTION

[0045] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0046] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0047] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0048] like Figure 1 As shown, this embodiment provides an offshore wind power cylindrical foundation structure, which includes a cylindrical foundation body 1, a spike-shaped structure 2, a first slide, a second slide 3, a sleeve 4, a first airbag device 5 and a second airbag device 6.

[0049] in:

[0050] The spike-shaped structure 2 is arranged at the lower part of the cylindrical basic body 1;

[0051] The first slideway and the second slideway 3 are respectively arranged inside and outside the cylinder wall of the cylindrical basic body 1;

[0052] The sleeve 4 is sleeved on the outside of the cylinder wall and can slide along the second slideway 3;

[0053] like Figure 2 As shown, the first airbag device 5 is arranged inside the cylinder wall, and the first airbag device 5 can slide along the first slideway.

[0054] In some embodiments, the outer wall of the cylindrical base body 1 is further provided with a second airbag device 6, an airbag groove 7 is provided in the second airbag device 6, the sleeve 4 is located in the airbag groove 7, the second airbag device 6 and the second airbag device 6 can slide along the second slide 3, and the sleeve 4 slides together with the second airbag device 6. Figure 3 shown.

[0055] The second airbag device 6 is only inflated with gas during transportation.

[0056] The first airbag device 5 is inflated with gas only during transportation and lowering.

[0057] It should be noted that in this embodiment, the first airbag device 5 and the second airbag device 6 are both existing structures, and those skilled in the art can configure them according to specific working conditions, which will not be described in detail here.

[0058] In the specific implementation process, when the offshore wind power cylindrical foundation structure is initially sunk into the mud, the lower part of the casing 4 is flush with the lower end of the spike-shaped structure 2, and a closed space is formed between the casing 4, the spike-shaped structure 2 and the soil. Suction is applied to the cylindrical foundation body 1 to cause suction sinking. Figure 5 shown.

[0059] When the offshore wind power cylindrical foundation structure is completely buried in the soil, the position of the casing 4 relative to the soil remains unchanged, and the cylindrical foundation body 1 slides downward along the second slideway 3 into the soil. Figure 6 shown.

[0060] Among them, during the lowering process of the cylindrical foundation, the first airbag device 5 can rise to the top of the cylinder along the slide, providing a certain buoyancy for the structure, which can effectively reduce the tension of the suspension cable during the lowering process and improve the safety of the suspension cable.

[0061] The presence of the spike-shaped structure at the bottom of the barrel foundation of this embodiment can reduce the risk of "water explosion" during the recovery and lifting process. When the traditional barrel foundation is lifted out of the water, since the area of the air vent at the top of the barrel is much smaller than the opening area at the bottom of the barrel, there is a certain delay in the air being sucked into the barrel. Therefore, the air pressure inside the barrel will have a suction effect on the water inside the barrel, making the liquid level inside the barrel higher than the external liquid level. When the water comes out of the bottom of the barrel, the pressure difference between the inside and outside of the barrel disappears, the water in the barrel is suddenly released, and a "water explosion" phenomenon occurs. The "water explosion" phenomenon will increase the motion response of the barrel foundation and increase the risk of the lifting construction process. The presence of the spike-shaped structure at the bottom of the barrel foundation gradually increases the area of communication between the water in the barrel and the external atmosphere during the water discharge process, and slows down the rate of reduction of the pressure difference between the inside and outside of the barrel, which can effectively reduce the occurrence of the "water explosion" phenomenon and improve the safety of the lifting process.

[0062] In addition to the spiked structure at the bottom of the barrel foundation, which can reduce the risk of "water burst" during the recovery and lifting process, the first and second airbag devices can also be used to reduce the risk of "water burst". Inflating the first airbag device during the lifting process and lowering the airbag to the bottom of the barrel before the structure emerges from the water can prevent "water burst" from occurring.

[0063] In one or more embodiments, a construction method for the above-mentioned offshore wind turbine cylindrical foundation structure is further provided, which specifically includes the following steps:

[0064] Step 1: Slide the sleeve 4 down the second slide 3 until the lower portion of the sleeve 1 is flush with the lower end of the spike-shaped structure 2, and lower the cylindrical base body 1 to the mud surface. At this time, the first airbag device 5 has been deflated and risen to the top of the cylindrical base body 1;

[0065] Step 2: Using its own weight, the offshore wind turbine cylindrical foundation structure is sunk into the mud. At this time, the spike structure 2 is not completely sunk into the mud. A closed space is formed between the casing 4, the spike structure 2 and the soil. Suction is applied to the inside of the cylinder to cause it to sink by suction.

[0066] Step 3: The offshore wind turbine cylindrical foundation structure continues to sink under the action of suction. At this time, the position of the casing 4 relative to the soil remains unchanged, and the cylinder slides downward relative to the casing 4 along the second slideway 3 into the mud;

[0067] Step 4: After the offshore wind turbine cylindrical foundation structure is completely buried in the mud, the casing 4 is located on the top of the cylinder to form a retaining structure, and rocks 10 are thrown onto the top of the cylinder to add ballasting.

[0068] In some embodiments, before the construction of the offshore wind turbine cylindrical foundation structure, the method further comprises:

[0069] The offshore wind turbine cylindrical foundation structure is transported to the installation sea area by a transport ship 8 .

[0070] Specifically, if Figure 4 As shown, the process of transporting the offshore wind turbine cylindrical foundation structure by the transport ship 8 is as follows:

[0071] Place the offshore wind turbine cylindrical foundation structure in the position of the transport ship groove 9; wherein the diameter of the transport ship groove 9 is the same as the diameter of the cylinder, and a third airbag device is embedded in the groove;

[0072] The first airbag device, the second airbag device and the third airbag device are inflated to fix the offshore wind turbine cylindrical foundation structure to the transport ship.

[0073] There is a circular groove on the transport ship, the diameter of the groove is the same as the diameter of the cylinder, and an airbag device is buried inside the groove. That is, during the transportation of the cylinder foundation, the third airbag device in the groove can be inflated to provide external support for the cylinder. At the same time, the bottom of the third airbag device is connected to the groove of the hull, which can effectively ensure a reliable connection between the cylinder and the transport ship.

[0074] During transportation, the first airbag device slides along the first slide to the bottom of the cylinder to provide internal support for the cylinder body, and at the same time inflates the second airbag device. The first airbag device and the second airbag device fix the cylinder foundation on the hull deck.

[0075] In some other embodiments, such as Figure 7 As shown, after the construction of the offshore wind power cylindrical foundation structure is completed, it also includes:

[0076] Recovering an offshore wind turbine cylindrical foundation structure. During the recovery and hoisting process, the first airbag is inflated, and when the cylinder is about to emerge from the water, the first airbag is lowered to the bottom of the cylinder. Reference numeral 11 represents the water surface, and reference 12 represents the water inside the cylinder. During the recovery and hoisting process, the first airbag can be inflated, and when the cylinder is about to emerge from the water, the airbag is lowered to the bottom of the cylinder to reduce the risk of "water explosion."

[0077] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. An offshore wind turbine cylindrical foundation structure, characterized in that: It includes a cylindrical basic body, a spike-shaped structure, a first slideway, a second slideway, a sleeve and a first airbag device; The spike-shaped structure is arranged at the lower part of the cylindrical basic body; The first slideway and the second slideway are respectively arranged inside and outside the cylinder wall of the cylinder-shaped basic body; The sleeve is sleeved on the outside of the cylinder wall and can slide along the second slideway; The first airbag device is arranged inside the cylinder wall and can slide along the first slideway.

2. The offshore wind power cylindrical foundation structure according to claim 1, characterized in that: A second airbag device is further provided on the outside of the cylindrical wall of the cylindrical basic body, and the second airbag device can slide along the second slideway.

3. The offshore wind turbine cylindrical foundation structure according to claim 2, characterized in that: The second airbag device is inflated with gas only during transportation.

4. The offshore wind power cylindrical foundation structure according to claim 1, characterized in that: The first airbag device is inflated with gas only during transportation.

5. The offshore wind power cylindrical foundation structure according to claim 1, characterized in that: When the offshore wind power cylindrical foundation structure initially sinks into the mud, the lower part of the casing is flush with the lower end of the spike-shaped structure, and a closed space is formed between the casing, the spike-shaped structure and the soil. Suction is applied to the cylindrical foundation body to cause suction sinking.

6. The offshore wind power cylindrical foundation structure according to claim 1, characterized in that: When the offshore wind power cylindrical foundation structure is completely embedded in the soil, the position of the casing relative to the soil remains unchanged, and the cylindrical foundation body slides downward along the second slideway into the soil.

7. A construction method for an offshore wind turbine cylindrical foundation structure according to any one of claims 1 to 6, characterized in that: include: Slide the sleeve down the second slideway until the lower part of the sleeve is flush with the lower end of the spike-shaped structure, and lower the cylindrical base body to the mud surface. At this time, the first airbag device rises to the top of the cylindrical base body and is deflated. The offshore wind turbine cylindrical foundation structure is sunk into the mud by its own weight. At this time, the spike structure is not completely immersed in the mud. A closed space is formed between the casing, the spike structure and the soil, and suction is applied to the inside of the cylinder to cause it to sink by suction. The offshore wind turbine cylindrical foundation structure continues to sink under the action of suction. At this time, the position of the casing relative to the soil remains unchanged, and the cylinder slides downward relative to the casing along the second slideway into the mud. After the offshore wind turbine cylindrical foundation structure is completely buried in the mud, the casing is located on the upper part of the cylinder top cover to form a retaining structure, and stones are thrown onto the upper part of the cylinder top cover for ballasting.

8. The construction method of the offshore wind turbine cylindrical foundation structure according to claim 7, characterized in that: Before the construction of the offshore wind power cylindrical foundation structure, the method further includes: The offshore wind turbine cylindrical foundation structure is transported to the installation sea area by a transport ship.

9. The construction method of the offshore wind turbine cylindrical foundation structure according to claim 8, characterized in that: The process of transporting offshore wind turbine cylindrical foundation structures by transport ships is as follows: The offshore wind turbine cylindrical foundation structure is placed in the groove of the transport ship. A second airbag device is provided on the outside of the cylindrical wall of the cylindrical foundation body, and the second airbag device can slide along the second slideway. The diameter of the transport ship groove is the same as the diameter of the cylinder, and a third airbag device is embedded in the groove. The first airbag device, the second airbag device and the third airbag device are inflated to fix the offshore wind turbine cylindrical foundation structure to the transport ship.

10. The construction method of the offshore wind turbine cylindrical foundation structure according to claim 7, characterized in that: After the construction of the offshore wind power cylindrical foundation structure is completed, the method further includes: The offshore wind power cylinder-type foundation structure is recovered, and the first airbag is inflated during the recovery and lifting process, and the first airbag is lowered to the bottom of the cylinder when the cylinder is about to emerge from the water.

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