Offshore wind power device and installation method of offshore wind power device

Abstract

The invention provides an offshore wind power device and an installation method of the offshore wind power device. The defects in the process of assembling the offshore wind power device on the land are overcome. The offshore wind power device comprises a tension leg platform and a fan, the tension leg platform comprises a mounting column and a tension arm, the mounting column is used for being connected with the fan, and the tension arm comprises an arm body connected with the mounting column and a wrist protruding from the arm body; the tension leg platform is provided with a marine transportation tool, the marine transportation tool comprises a plurality of floating bodies, the floating bodies are connected to the wrist part, and a plurality of ballast tanks are arranged in the floating bodies and used for injecting or discharging ballast water; the installation method comprises the steps that s1, the tension leg platform and the draught fan are towed to an assembly water area; s2, ballast water is injected into the floating body until the tension leg platform sits at the bottom; s3, the fan and the tension leg platform are assembled; s4, discharging ballast water in the floating body; and s5, towing the assembled fan and tension leg platform to an installation water area, and connecting the tension leg platform with the seabed of the installation water area.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power devices, and in particular, to an offshore wind power device and an installation method of an offshore wind power device. Background Art

[0002] As the global demand for renewable energy grows, offshore wind power generation is becoming increasingly important as a clean and renewable energy source. However, in the field of offshore wind power assembly, the traditional solution of assembling on land and then transporting the entire unit to the sea faces many challenges and limitations.

[0003] On the one hand, the limited resources of land crawler cranes have become one of the constraints. Since the weight and size of large offshore wind turbines far exceed the capabilities of conventional lifting equipment, it has become extremely difficult to find land crawler cranes with sufficient load-bearing capacity and operating radius. This not only increases the time cost of the project, but also limits the choice of assembly site, greatly reducing the flexibility of the project. On the other hand, the risk of assembling the tension leg platform with the wind turbine and then loading it for transportation cannot be ignored. The offshore environment is complex and changeable, and factors such as wind, waves, and tides place extremely high demands on the transportation of large equipment. Not only does the ship need to have strong stability and carrying capacity, but it also needs to face extreme weather conditions that may be encountered during transportation, which greatly increases the safety risks and economic loss risks during transportation. Thirdly, the process of bringing the tooling equipment ashore after assembly on land further increases the complexity and cost of the assembly process.

[0004] In view of this, how to overcome the drawbacks of land assembly of a series of wind turbines and tension leg platforms has been pursued by technical personnel in this field. Summary of the invention

[0005] The purpose of the present invention is to provide an installation method for an offshore wind power device, which enables the tension leg platform and the wind turbine to be assembled at sea, overcomes the wall sections assembled on land, avoids the risk of overall shipping, and effectively reduces project costs.

[0006] To achieve the above-mentioned object, the present invention provides an offshore wind power device and an installation method of the offshore wind power device, wherein the offshore wind power device comprises a tension leg platform and a wind turbine, wherein the tension leg platform comprises a mounting column and a tension arm, wherein the mounting column is used to connect with the wind turbine, and the tension arm comprises an arm body connected with the mounting column and a wrist protruding from the arm body; the tension leg platform is equipped with an offshore transport tool; the offshore transport tool comprises a plurality of floating bodies, wherein the floating bodies are connected to the wrist, and wherein a plurality of ballast tanks are arranged in the floating bodies for injecting or discharging ballast water;

[0007] The installation method comprises:

[0008] s1. Towing the tension leg platform and the wind turbine to the assembly waters respectively;

[0009] s2, injecting ballast water into the buoy until the tension leg platform is seated on the bottom;

[0010] s3, assembling the wind turbine and the tension leg platform;

[0011] s4, discharging the ballast water in the floating body;

[0012] s5. The assembled wind turbine and the towed vessel are towed to the installation waters, and the tension leg platform is connected to the seabed of the installation waters.

[0013] By adopting the solution in the present application, the tension leg platform and the wind turbine are first transported separately to the assembly waters, and then the tension leg platform is placed on the bottom. The wind turbine and the tension leg platform are then assembled in the assembly waters. Finally, the assembled wind turbine and the tension leg platform are towed together to the installation waters for installation. This method changes the traditional method of assembling the tension leg platform and the wind turbine on land, overcomes the resource limitations in the land assembly process, avoids the overall loading risk, and effectively reduces the project cost.

[0014] Optionally, a cylinder with an opening at the bottom is further provided on the lower surface of each buoy, and the bottom of the cylinder can be inserted into the seabed to block the opening. In this embodiment, the cylinder serves as a leveling structure, which can level the tension leg platform when the tension leg platform is seated.

[0015] Optionally, s2 also includes:

[0016] s21. Inject ballast water into the floating body so that the bottom of each cylinder is inserted into the seabed of the assembly water area.

[0017] In this way, the verticality of the fan and the mounting column can be ensured, and the docking accuracy of the fan and the mounting column can be ensured.

[0018] Optionally, it also includes:

[0019] s22, adjusting the negative pressure in each cylinder to adjust the embedding depth of the cylinder in the seabed. Thus, the embedding depth of different cylinders in the seabed can be adjusted, so as to level the tension leg platform.

[0020] Optionally, s4 also includes:

[0021] s41, releasing the negative pressure in the cylinder to separate the suction cylinder from the seabed, thereby enabling the suction cylinder to assist the floating body and push the assembled wind turbine device out from the seabed.

[0022] Optionally, s1 also includes:

[0023] s11. Roll-on / roll-off the tension leg platform to a semi-submersible vessel; s12. The semi-submersible vessel sinks, and the tension leg platform is self-floating under the action of the offshore transport tooling.

[0024] By adopting this method, the buoy can help float the tension leg platform and improve the stability of the tension leg platform during transportation.

[0025] Optionally, in s1 and s5, the following is further included:

[0026] s6. Control the injection or discharge of ballast water into the buoy to adjust the draft of the tension leg platform. In this way, on-site personnel can adjust the draft of the tension leg platform according to the current sea conditions, thereby ensuring the transportation stability of the tension leg platform and the stability of the offshore wind power device after assembly.

[0027] Optionally, in s6, when the floating body sinks to a set depth, the injection of ballast water into the floating body is stopped, so that the top of the floating body is always above the sea surface. Thus, the floating body always remains partially above the water surface, thereby providing sufficient stability support.

[0028] Optionally, the float is provided with a water level detection device for detecting the set depth, and the water level detection device is arranged at the lower side of the top of the float in the height direction. By detecting the water entry depth of the float through the water level detection device, the injection of ballast water can be stopped in time.

[0029] Optionally, the installation method further comprises: s7, in the installation water area, a plurality of positioning piles are arranged, one end of the tension tendon is connected to the corresponding positioning pile, and the other end is connected to a buoy. The location of the installation water area can be accurately indicated by arranging the positioning device, and at the same time, the other end of the tension tendon is connected to the buoy, so that the tension tendon is conveniently connected to the corresponding part of the tension leg.

[0030] By adopting the installation method in this application, the following advantages are achieved:

[0031] First, it realizes the offshore assembly of the tension leg platform and wind turbine on a floating foundation, avoiding a series of disadvantages of land assembly;

[0032] Second, the towing stability and installation safety of the tension leg platform and the offshore wind power device as a whole are significantly improved: In view of the problem of insufficient stability that may occur in the overall towing process of the tension leg platform, the marine transport tooling in this application is used to effectively enhance the overall stability of the tension leg platform during the towing process, ensuring the safety and reliability of the towing process.

[0033] Third, the application of offshore transport tooling further improves the stability of the tension leg platform during the installation process and reduces safety risks caused by environmental fluctuations or improper operation.

[0034] An offshore wind power device is installed using the above-mentioned offshore wind power device installation method, the offshore wind power device includes a tension leg platform and a wind turbine, the tension leg platform includes a mounting column and a tension arm, the mounting column is used to connect with the wind turbine, the tension arm includes an arm body connected to the mounting column and a wrist protruding from the arm body; the tension leg platform is equipped with offshore transport tooling, the offshore transport tooling includes a plurality of buoys, the buoys are connected to the wrist, and a plurality of ballast tanks are arranged in the buoy for injecting or discharging ballast water.

[0035] By adopting the method in the present application, the transport tooling can be injected with water, so that under the action of the transport tooling, the tension leg platform is driven to sink to a certain height, thereby significantly reducing the center of gravity of the tension leg platform; at the same time, since the highest point of the floating body exceeds 1 / 2 of the vertical height of the installation column, the depth of the floating body sinking to the sea surface can be increased, thereby increasing the contact area and interaction force between the tension leg platform and the seawater, which not only helps to disperse the wave impact force on the tension leg platform, but also further improves the overall stability of the tension leg platform by increasing the underwater damping effect, reduces the shaking of the tension leg platform caused by wave fluctuations, and improves the stability of the tension leg platform.

[0036] Optionally, the floating bodies are connected to the wrists of corresponding tension arms in groups of two, and the two floating bodies belonging to the same group are arranged on both sides of the tension arm.

[0037] Optionally, the buoy includes an upper section and a lower section, the upper section is vertically located on the upper side of the lower section, the maximum dimension of the upper section in the horizontal direction is smaller than the maximum dimension of the lower section in the horizontal direction, and the vertical height of the upper section is greater than the vertical height of the lower section. By adopting such a method, the horizontal dimension of the lower section is larger, so that the lower section has a larger waterplane surface (referring to the intersection surface of the horizontal plane under a specific draft and the buoyancy body), which is used to enhance the wind and wave resistance of the overall structure of the tension leg platform and the wind turbine and increase the stability of the system during long-distance towing; at the same time, compared with the lower section, the vertical dimension of the upper section is greater than that of the lower section, and sufficient height increases the sinking distance of the tension leg platform, thereby increasing the waterplane surface of the tension leg platform, and further increasing the buoyancy of the tension leg platform.

[0038] Optionally, the cross section of the upper section in the horizontal direction is circular, and the cross section of the lower section in the horizontal direction is square. Since the top of the upper section will always be above the sea surface during wet dragging, the circular cross section of the upper section can improve the fluid dynamics performance of the upper section, and can more effectively reduce the impact and shaking caused by waves and ocean currents, thereby improving the stability of the power leg platform during wet dragging. The square shape of the lower section allows the lower section to have more space to accommodate the carrying water, so that the float has a better ballast effect.

[0039] Optionally, a buoy is installed at the front end of the wrist, and the offshore transport tooling is located between the arm body and the buoy. This installation position is convenient for installation and disassembly and will not interfere with the buoy of the tension leg platform itself.

[0040] Optionally, the vertical height of the upper section is greater than the vertical height of the buoy, and the buoy can be completely submerged in water during wet dragging, further increasing the draft area of ​​the tension leg platform.

[0041] Optionally, the tension leg platform further comprises an oblique brace, one end of the oblique brace abuts against the mounting column, and the other end abuts against the position where the arm body and the wrist are connected; the upper section vertically exceeds the position where the oblique brace abuts against the mounting column. Thus, the oblique brace can be submerged in water, thereby further increasing the draft area of ​​the tension leg and lowering the center of gravity of the tension leg.

[0042] Optionally, the central axis of the upper section coincides with the center line of the lower section, thereby ensuring that the force on each floating body is uniform.

[0043] Optionally, the buoys are evenly arranged along the circumference of the mounting column; the buoys are evenly arranged along the circumference of the mounting column, which can ensure that the load distribution of the platform in the horizontal direction is more uniform, which helps to reduce the structural stress and deformation caused by uneven load, thereby improving the overall stability of the tension leg platform; at the same time, the evenly distributed buoys can better resist the impact of external forces, reduce the shaking and tilting of the tension leg platform, and further improve the stability of the tension leg platform.

[0044] Optionally, one of the lower sections is provided with a U-shaped connecting arm, and the other lower section is provided with a plate-like connecting arm, and the plate-like connecting arm and the U-shaped connecting arm are plugged and locked radially along the wrist; the transport tooling is provided with an installation channel for installing the wrist, and the installation channel axially penetrates the U-shaped connecting arm and the plate-like connecting arm; the U-shaped connecting arm has two side arm sections axially opposite to each other at the wrist, and the side arm sections are each provided with a first installation groove, and the plate-like connecting arm is provided with a second installation groove; the groove wall of the first installation groove constitutes part of the wall of the installation channel, and the groove wall of the second installation groove constitutes part of the wall of the installation channel, thereby enabling the transport tooling to be connected to each wrist. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0046] Figure 1 is a flow chart of a method for installing an offshore wind power device in an embodiment of the present invention;

[0047] Figure 2 It is a schematic diagram of the steps of the installation method of an offshore wind power device, one of which;

[0048] Figure 3 It is a schematic diagram of the steps of the installation method of an offshore wind power device, part 2;

[0049] Figure 4 It is a schematic diagram of the steps of the installation method of an offshore wind power device, part 3;

[0050] Figure 5 It is a schematic diagram of the steps of the installation method of an offshore wind power device, No. 4;

[0051] Figure 6 It is a schematic diagram of the steps of the installation method of an offshore wind power device, part five;

[0052] Figure 7 This is a schematic diagram of the steps of the installation method of an offshore wind power device, No. 6;

[0053] Figure 8 It is a schematic diagram of the steps of the installation method of an offshore wind power device, No. 7;

[0054] Fig. 9 is a top view of the tension leg platform, the wind turbine and the offshore transport tooling after assembly in an embodiment of the present invention;

[0055] Fig.10 yes Fig. 9 A partial side view of

[0056] Fig.11 It is a side view of the two floating bodies of the marine transport tooling in the disassembled state;

[0057] Fig.12 It is a side view of the two floating bodies of the marine transport tooling in the assembled state;

[0058] Fig.13 yes Fig.12 A top view of

[0059] Fig.14 It is a schematic diagram of the steps of the installation method of an offshore wind power device, No. 8;

[0060] Fig.15It is a schematic diagram of the steps of the installation method of an offshore wind power device, No. 9;

[0061] Fig.16 This is a schematic diagram of the steps of the installation method of an offshore wind power device, the tenth one.

[0062] Reference numerals:

[0063] 100-TLP; 200-Wind turbine; 1-Tension arm; 11-Arm body; 12-Wrist; 13-Diagonal brace; 2-Offshore transport tooling; 20-Floating body; 21-Upper section; 22-Lower section; 221-U-shaped connecting arm; 221a-Side arm section; 221b-First mounting groove; 221c-Bottom arm section; 222-Plate-shaped connecting arm; 222a-Second mounting groove; 223-Installation channel; 23-Ballast tank; 24-Watertight compartment bulkhead plate; 25-Cylinder; 26-Accommodation space; 27-Locking piece; 3-Mounting column; 4-Float; 300-Semi-submersible vessel; 400-Sea crane; 500-Positioning pile; 600-Tension tendon; 700-Tugboat. DETAILED DESCRIPTION

[0064] The present invention provides an offshore wind power device and an installation method for the offshore wind power device, which enables the tension leg platform and the wind turbine to be assembled at sea, overcomes the wall sections assembled on land, avoids the risk of overall shipping, and effectively reduces project costs.

[0065] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0066] Relational terms such as “first” and “second” and the like are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any such actual relationship or order between these components.

[0067] As the global demand for renewable energy grows, offshore wind power generation is becoming increasingly important as a clean and renewable energy source. However, in the field of offshore wind power assembly, the traditional solution of assembling on land and then transporting the entire unit to the sea faces many challenges and limitations.

[0068] On the one hand, the limited resources of land crawler cranes have become one of the constraints. Since the weight and size of large offshore wind turbines far exceed the capabilities of conventional lifting equipment, it has become extremely difficult to find land crawler cranes with sufficient load-bearing capacity and operating radius. This not only increases the time cost of the project, but also limits the choice of assembly site, greatly reducing the flexibility of the project. On the other hand, the risk of assembling the tension leg platform with the wind turbine and then loading it for transportation cannot be ignored. The offshore environment is complex and changeable, and factors such as wind, waves, and tides place extremely high demands on the transportation of large equipment. Not only does the ship need to have strong stability and carrying capacity, but it also needs to face extreme weather conditions that may be encountered during transportation, which greatly increases the safety risks and economic loss risks during transportation. Thirdly, the process of bringing the tooling equipment ashore after assembly on land further increases the complexity and cost of the assembly process.

[0069] In view of the above situation, the present application creatively proposes a method for assembling an offshore wind power device at sea.

[0070] Please refer to Figure 1-Figure 8 ,as well as Figure 14-16 , Figure 1 is a flow chart of a method for installing an offshore wind power device in an embodiment of the present invention; Figure 2 It is a schematic diagram of the steps of the installation method of an offshore wind power device, one of which; Figure 3 It is a schematic diagram of the steps of the installation method of an offshore wind power device, part 2; Figure 4 It is a schematic diagram of the steps of the installation method of an offshore wind power device, part 3; Figure 5 It is a schematic diagram of the steps of the installation method of an offshore wind power device, No. 4; Figure 6 It is a schematic diagram of the steps of the installation method of an offshore wind power device, part five; Figure 7 This is a schematic diagram of the steps of the installation method of an offshore wind power device, No. 6; Figure 8 It is a schematic diagram of the steps of the installation method of an offshore wind power device, No. 7; Fig.14 It is a schematic diagram of the steps of the installation method of an offshore wind power device, No. 8; Fig.15 It is a schematic diagram of the steps of the installation method of an offshore wind power device, No. 9; Fig.16 This is a schematic diagram of the steps of the installation method of an offshore wind power device, the tenth one.

[0071] Please also refer to Figures 9 to 13 , Fig. 9 is a top view of the tension leg platform, the wind turbine and the offshore transport tooling after assembly in an embodiment of the present invention; Fig.10 yes Fig. 9 A partial side view of Fig.11 It is a side view of the two floating bodies of the marine transport tooling in the disassembled state; Fig.12 This is a side view of the two floating bodies of the marine transport tooling assembled. Fig.13 yes Fig.12 Top view of the .

[0072] like Figure 9-13 As shown, the present application provides an installation method for an offshore wind power device, an offshore wind power device and an offshore transport tooling 2. The offshore wind power device is installed using the aforementioned installation method for an offshore wind power device. The offshore wind power device includes a tension leg platform 100 and a wind turbine 200. The tension leg platform 100 is used to support the wind turbine 200. The tension leg platform 200 is also equipped with an offshore transport tooling 2.

[0073] Specifically, the tension leg platform 100 includes a tension arm 1 and a mounting column 3, the mounting column 3 extends in a vertical direction to install the wind turbine 200, the tension arm 1 is distributed along the circumference of the mounting column 3, and extends in the radial direction of the mounting column 3. In the example shown in the figure, the tension leg platform 100 has three tension arms 1, and the three tension arms 1 are evenly distributed around the mounting column 3; each tension arm 1 specifically includes an arm body 11 and a wrist 12 protruding from the arm body 11, the tension arm 1 is a horizontally extending tubular beam, one end of which is connected to the mounting column 3, and the other end continues to extend to form the wrist 12, extending in the same direction as the arm body 11 in the horizontal direction, the tension leg platform 100 also includes a diagonal brace 13, one end of the diagonal brace 13 is abutted against the mounting column 3, and the other end is abutted at the position where the arm body 11 is connected to the wrist 12, and a buoy 4 is installed at the front end of the wrist 12, that is, the end of the wrist 12 away from the mounting column 3.

[0074] The marine transport tooling 2 includes a plurality of floating bodies 20, which are connected to the corresponding wrists 12 in pairs. The floating bodies 20 in the same group are arranged on both sides of the tension arm 1; being located on both sides of the tension arm 1 means being located on the left and right sides of the wrist 12 in the radial direction of the wrist 12. In the vertical direction, the highest point of the floating body 20 exceeds 1 / 2 of the vertical height of the mounting column 3. At the same time, a plurality of ballast tanks 23 are separated in the marine transport tooling 2, and the ballast tanks 23 can discharge and inject ballast water. Each ballast tank 23 can be independent of each other or sealed from each other. The ballast tank 23 uses air ballast technology to drain and inject water into the ballast tank 23.

[0075] By adopting the method in the present application, the offshore transport tooling 2 can be injected with water, so that under the action of the offshore transport tooling 2, the tension leg platform 100 is driven to sink to a certain height, thereby significantly reducing the center of gravity of the tension leg platform 100; at the same time, since the highest point of the floating body 20 exceeds 1 / 2 of the vertical height of the mounting column 3, the depth of the floating body 20 sinking to the sea surface can be increased, thereby increasing the contact area and interaction force between the tension leg platform 100 and the seawater, which not only helps to disperse the wave impact force on the tension leg platform 100, but also further improves the overall stability of the tension leg platform 100 by increasing the underwater damping effect, reduces the shaking of the tension leg platform 100 caused by wave fluctuations, and improves the stability of the tension leg platform 100.

[0076] like Figure 1-Figure 8 As shown, the installation method of the offshore wind power device provided in this application specifically includes:

[0077] s1. Towing the tension leg platform 100 and the wind turbine 200 to the assembly waters respectively;

[0078] s2, injecting ballast water into the floating body 20 until the tension leg platform 100 is seated on the bottom;

[0079] s3, assembling the wind turbine 200 and the tension leg platform 100;

[0080] s4, discharging the ballast water in the floating body 20;

[0081] s5. Tow the assembled wind turbine 200 to the installation waters and connect the tension leg platform 100 to the seabed of the installation waters.

[0082] By adopting the solution in the present application, the tension leg platform 100 and the wind turbine 200 are first transported separately to the assembly waters, and then the tension leg platform 100 is placed on the bottom, and then the wind turbine 200 and the tension leg platform 100 are assembled in the assembly waters. Finally, the assembled wind turbine 200 and the tension leg platform 100 are towed together to the installation waters for installation. This method changes the traditional method of assembling the tension leg platform 100 and the wind turbine 200 on land, overcomes the resource limitations in the land assembly process, avoids the overall loading risk, and effectively reduces the project cost.

[0083] Specifically, if Figure 1-Figure 8 as well as Figure 14-16 As shown, in s1, the wind turbine 200 and the tension leg platform 100 can be wet mopped or dry mopped, and the tension leg platform 100 is preferably wet mopped; in a specific example, as shown in FIG. Fig.15 As shown, s1 also includes:

[0084] s11. Roll-on / roll-off the tension leg platform 100 to the semi-submersible vessel 300;

[0085] s12. The semi-submersible vessel 300 sinks, and the tension leg platform 100 is self-floating under the action of the offshore transport tooling 2.

[0086] The tension leg platform 100 can achieve self-floating under the action of the floating body 20, and then a tugboat is used to tow the tension leg platform 100 to the assembly waters.

[0087] In this way, the buoy 20 can help float the tension leg platform 100, while improving the stability of the tension leg platform 100 during transportation.

[0088] See also Figure 4-Figure 6 In the embodiment of s2, ballast water is injected into the floating body 20 until the tension leg platform 100 is seated on the bottom, as a specific implementation method, a control system and a ballast system connected to the control system are provided; the ballast system may include components such as a submersible pump, a pipeline, and a valve. The submersible pump is responsible for pumping water from the external seawater and transporting it to the floating body 20 through a pipeline. Under the operation of the control system, ballast water is gradually injected into the floating body 20. This process requires strict control of the speed and amount of water injection to ensure that the tension leg platform 100 can sink smoothly and avoid instability or tilting of the tension leg platform 100 due to excessive water injection. After confirming that the tension leg platform 100 is seated and stable, the ballast system is turned off and the injection of ballast water into the floating body 20 is stopped.

[0089] After the tension leg platform 100 is seated, the weight of the tension leg platform 100 is mainly supported by the seabed, thereby providing a stable installation foundation for the installation of the wind turbine 200. In this embodiment, those skilled in the art can select the water depth of the assembly water area according to the height of the floating body 20, so that the floating body 20 is always exposed above the water surface. After confirming that the tension leg platform 100 is stable and meets the installation conditions, the assembly of the wind turbine 200 begins, for example, the wind turbine 200 is hoisted onto the tension leg platform 100 by the sea crane 400 and connected to the installation column 3, and then various cables and pipelines are connected.

[0090] like Fig.10 , Fig.11 As shown, in some other optional embodiments, the marine transport tooling 2 further includes a leveling structure, which is arranged on the lower surface of the lower section 22; the leveling structure includes a cylinder 25, the inner wall of the cylinder 25 and the lower surface of the lower section 22 form a cavity, and the cylinder 25 is coaxially arranged with the upper section 21. Through such an arrangement, the tension leg platform 100 can be seated under the action of the floating body 20, and the leveling structure can be used for leveling during the process of its seating.

[0091] Specifically, a cylinder 25 with an opening at the bottom is further provided on the lower surface of each buoy 20, and the bottom of the cylinder 25 can be inserted into the seabed to block the opening. In this embodiment, the cylinder 25 serves as a leveling structure, and can level the tension leg platform 100 when the tension leg platform 100 is seated.

[0092] like Fig.14 As shown, in this embodiment, the installation method of the offshore wind power device in step s2 also includes:

[0093] s21. Inject ballast water into the floating body 20 so that the bottom of each cylinder 25 is inserted into the seabed of the assembly water area.

[0094] In this way, the verticality of the fan 200 and the mounting column 3 can be ensured, and the docking accuracy of the fan 200 and the mounting column 3 can be ensured.

[0095] Specifically, in s21, as a specific implementation, the control system is also signal-connected with a water depth sensor. During the ballasting process of the floating body 20, the water depth below the floating body 20 is monitored in real time to ensure that the bottom of the cylinder 25 can be accurately inserted into the seabed to close the opening of the cylinder 25, so that a closed cavity is formed in the cylinder 25; optionally, the control system can also measure the pressure when the bottom of the cylinder 25 contacts the seabed, and the pressure change of the ballast water in the floating body 20 through a pressure sensor to ensure the safety and stability of the ballasting process. The control system adapted to this can also monitor the stress changes of the cylinder 25 and the floating body 20 structure during the ballasting process through a stress sensor to prevent structural damage caused by excessive stress. The stress sensor can be set at a weak position such as the connection between the cylinder 25 and the floating body 20, and those skilled in the art can choose it by themselves.

[0096] The offshore wind turbine installation method s2 further includes s22, adjusting the negative pressure in each cylinder 25 to adjust the seabed embedding depth of the cylinder 25. Thus, the seabed embedding depth of different cylinders 25 can be adjusted, so as to level the tension leg platform 100.

[0097] The control system is also connected to a negative pressure system, which may include, for example, a vacuum pump for generating and maintaining negative pressure in the cylinder 25, a negative pressure regulating tank for storing and regulating negative pressure to ensure a stable supply, and various pipes and valves for connecting the vacuum pump, the negative pressure regulating tank and the cylinder 25 to control the transmission and cutoff of negative pressure. A scale is also provided on the outside of the cylinder 25 to assist in indicating the embedding depth of the cylinder 25 on the seabed.

[0098] In this embodiment, the control system monitors whether the tension leg platform 100 is in a horizontal state at any time. If a part of the tension leg platform 100 is higher than other parts, the cylinder 25 of this part is negatively pressured to increase the embedding depth of the cylinder 25 in the seabed.

[0099] As some other embodiments, in s3, the step of completing the assembly of the wind turbine 200 and the tension leg platform 100; the sea crane 400 can be used to vertically lift the wind turbine 200, so that the wind turbine 200 can be lowered into the installation column 3 accordingly, thereby completing the assembly of the wind turbine 200 and the tension leg platform 100.

[0100] Then, step s4 is performed to discharge the ballast water in the floating body 20. At this time, the ballast water is discharged, and under the action of buoyancy, the tension leg platform 100 rises and is separated from the seabed to carry out the next step of towing.

[0101] In this embodiment, if Fig.16 As shown, if a cylinder 25 is also installed at the lower part of the floating body 20, in s4, it also includes: s41, releasing the negative pressure in the cylinder 25 to separate the suction cylinder from the seabed. In this way, the floating body 20 can be assisted by the suction cylinder to push the assembled wind turbine device out of the seabed. In this way, it can be avoided that the cylinder 25 hinders the floating of the tension leg structure.

[0102] In the embodiment of the present application, water is first injected into each cylinder 25 until the first cylinder 25 embedded in the seabed is detached from the seabed, and then the drainage operation of each floating body 20 is started. Before the last cylinder 25 embedded in the seabed is detached from the seabed, the drainage operation of each floating body 20 is completed to maximize the buoyancy of the tension leg platform 100.

[0103] That is to say, the control system injects water into each cylinder 25, but does not discharge ballast water from each buoy 20. Water is injected into each cylinder 25 to release the negative pressure inside each cylinder 25. At this time, the cylinder 25 is pushed away from the seabed, and the tension leg platform 100 can gradually rise under the drive of the cylinder 25. Preferably, in this process, the water injection speed of each cylinder 25 is kept consistent to prevent the tension leg platform 100 from tilting during the ascent.

[0104] When the control system detects that the opening of one of the cylinders 25 is no longer sealed by the seabed, that is, when the bottom of one of the cylinders 25 is detected to be off the seabed, the control system controls the floating body 20 to drain water outwards, while the remaining cylinders 25 continue to be filled with water. In this process, the drainage speed of the floating body 20 and the water filling speed of each cylinder 25 can be calculated to match, thereby ensuring that the tension leg platform 100 is approximately in a horizontal state.

[0105] When the control system detects that one of all the cylinders 25 is still embedded in the seabed and the other cylinders 25 are all out of the seabed, the control system needs to detect whether the ballast water in each floating body 20 has been drained. If it is detected that the drainage in each floating body 20 is completed, water will continue to be injected into the last cylinder 25 to make it separate from the seabed; if it is detected that there is still ballast water in each floating body 20, water injection into the last cylinder 25 will be stopped, and the drainage operation in each floating body 20 will be maintained; and within a certain time interval, the control system detects whether the drainage of the floating body 20 is completed at a certain frequency, until it is detected that the drainage of the floating body 20 is completed, and then water is injected into the last cylinder 25 again until the last cylinder 25 is separated from the seabed and the offshore wind power device as a whole floats on the sea surface.

[0106] The completion of drainage does not only refer to the state in which the ballast water in each ballast tank in the floating body 20 is emptied, but also may refer to the state in which the ballast tank still has a certain amount of ballast water, as long as it is ensured that the tension leg platform 100 is in a suspended state when the drainage is completed.

[0107] By adopting this method, on the one hand, the assembled offshore wind power device can be kept in a roughly horizontal state and floated; in addition, if water is directly injected into the cylinder 25 until all the cylinders 25 are separated from the seabed, the tension leg platform 100 will cause a certain bounce at the moment of separation from the seabed; through the method in the present application, before the first cylinder 25 is separated from the seabed, the buoy 20 is kept in a ballasted state, which can lower the center of gravity of the wind power device and reduce or avoid its bounce. Before the last cylinder 25 is separated from the seabed, the buoy 20 is in a state of complete drainage, which can minimize the inclination of the tension leg platform 100 when it is separated from the seabed. Specifically, the cylinder 25 that is separated from the seabed last must be embedded in a lower position on the seabed, while the height of the seabed corresponding to the rest of the tension leg platform 100 is higher. If the buoy 20 has not completed drainage at this time, the height of the part of the tension leg in contact with the seabed above the sea surface will be greater than the height of the part of the buoy in contact with the seabed above the sea surface, thereby causing the tension leg platform 100 to incline more at the moment of separation from the seabed.

[0108] As some other optional embodiments, in s1 and s5, the following is further included:

[0109] like Figure 4 and Figure 7 As shown, s6, control the injection or discharge of ballast water into the floating body 20 to adjust the draft of the tension leg platform 100. In this way, the on-site personnel can adjust the draft of the tension leg platform 100 according to the current sea conditions, thereby ensuring the transportation stability of the tension leg platform 100 and the stability of the assembled offshore wind power device.

[0110] Specifically, in s6, when the floating body 20 sinks to the set depth, the ballast water is stopped from being injected into the floating body 20, so that the top of the floating body 20 is always above the sea surface. Thus, the floating body 20 is always partially above the water surface, thereby providing sufficient stability support.

[0111] Optionally, the floating body 20 is provided with a water level detection device for detecting a set depth, the water level detection device is electrically connected to the control system, and the water level detection device is arranged at the lower side of the top of the floating body 20 in the height direction. By detecting the water entry depth of the floating body 20 through the water level detection device, the injection of ballast water can be stopped in time.

[0112] like Figure 8 As shown in some other optional embodiments, the installation method further includes: s7, in the installation water area, a plurality of positioning piles 500 are arranged, one end of the tension tendon 600 is connected to the corresponding positioning pile 500, and the other end is connected to the buoy. By setting the positioning device, the location of the installation water area can be accurately shown, and at the same time, the other end of the tension tendon 600 is connected to the buoy, which facilitates the connection between the tension tendon 600 and the corresponding part of the tension leg.

[0113] The following is a detailed description of the installation method in this application using a specific implementation method:

[0114] First, the tension leg platform 100 is transported to the dock and loaded onto a semi-submersible barge by a roll-on / roll-off method;

[0115] After loading, the tugboat 700 is used to tow the tension leg platform 100 to the assembly waters, which can be selected from shallow waters and good sea conditions. The semi-submersible barge is ballasted, and the tension leg platform 100 floats on the sea surface under the action of the floating body 20. In this embodiment, the tension leg platform 100 can be connected to the offshore transport tooling 2 on land, or the offshore transport tooling 2 and the tension leg platform 100 can be installed at sea after the tension leg platform 100 floats on the sea.

[0116] When the tension leg platform 100 is transported to the assembly sea area, the buoy 20 is ballasted to drive the tension leg platform 100 to sit on the bottom.

[0117] A self-elevating installation vessel (or sea crane 400) is used to install the wind turbine 200 in the assembly waters. While the wind turbine 200 is being installed, another work surface installs several positioning piles 500 (or suction piles) in the installation waters for subsequent connection with the tension leg platform 100. The positioning piles 500 are connected to the tendons 600 before installation, and a buoy is connected to the connection point of the tendons 600 to mark its position in the water.

[0118] The ballast water in the floating body 20 is discharged, and the entire offshore wind power device floats. At this time, the offshore transport tooling 2 can provide sufficient stability for the entire device to meet the stability requirements for long-distance towing.

[0119] Finally, the entire device is towed to the installation sea area and positioned by a tugboat 700. After positioning, the tension leg platform 100 and the offshore transport tooling 2 are used to jointly ballast the entire device so that it sinks to the installation draft, that is, the draft at which the tension tendons 600 can be connected. The tension tendons 600 are connected to the tension leg platform 100 accordingly, thereby completing the installation of the offshore wind power device.

[0120] By adopting the installation method in this application, the following advantages are achieved:

[0121] First, the floating foundation offshore assembly of the tension leg platform 100 and the wind turbine 200 is realized, avoiding a series of disadvantages of land assembly;

[0122] Second, the towing stability and installation safety of the tension leg platform 100 and the offshore wind power device as a whole are significantly improved: In order to address the problem of insufficient stability of the tension leg platform 100 that may occur during the overall towing process, the offshore transport tooling 2 in the present application is used to effectively enhance the overall stability of the tension leg platform 100 during the towing process, thereby ensuring the safety and reliability of the towing process.

[0123] Third, the application of the offshore transport tooling 2 further improves the stability of the tension leg platform 100 during the installation process and reduces the safety risks caused by environmental fluctuations or improper operation.

[0124] The specific structure of the marine transport tooling 2 is described below with some specific embodiments:

[0125] In some implementations, the buoys 20 are evenly arranged along the circumference of the mounting column 3; the buoys 20 are evenly arranged along the circumference of the mounting column 3, which can ensure that the load distribution of the platform in the horizontal direction is more uniform, and help reduce the structural stress and deformation caused by uneven load, thereby improving the overall stability of the tension leg platform 100; at the same time, the evenly distributed buoys 20 can better resist the impact of external forces, reduce the shaking and tilting of the tension leg platform 100, and further improve the stability of the tension leg platform 100.

[0126] In a specific embodiment, the floating body 20 includes an upper section 21 and a lower section 22. The upper section 21 is located vertically on the upper side of the lower section 22. The maximum horizontal dimension of the upper section 21 is smaller than the maximum horizontal dimension of the lower section 22. The vertical height of the upper section 21 is greater than the vertical height of the lower section 22. The ballast tanks 23 in the upper section 21 are distributed vertically, and the ballast tanks 23 in the lower section 22 are distributed horizontally, and each ballast tank 23 is connected. By adopting such a method, the horizontal dimension of the lower section 22 is larger, so that the lower section 22 has a larger waterplane surface (referring to the intersection surface of the horizontal plane under a specific draft and the floating body 20), which is used to improve the wind and wave resistance of the overall structure of the tension leg platform 100 and the wind turbine 200 during long-distance towing, and increase the stability of the system; at the same time, compared with the lower section 22, the vertical dimension of the upper section 21 is greater than that of the lower section 22. The sufficient height increases the sinking distance of the tension leg platform 100, thereby increasing the waterplane surface of the tension leg platform 100, and further increasing the buoyancy of the tension leg platform 100.

[0127] In some embodiments, the highest point of the floating body 20 is greater than the highest point of the buoy 4, so that the buoy 4 can be completely submerged in the water. Optionally, the vertical height of the upper section 21 is greater than the vertical height of the buoy 4, and the buoy 4 can be completely submerged in the water during wet dragging, further increasing the draft of the tension leg platform 100. Alternatively, the upper section 21 vertically exceeds the position where the diagonal brace 13 abuts against the mounting column 3. In this way, the diagonal brace 13 can be submerged in the water, thereby further increasing the draft of the tension leg and lowering the center of gravity of the tension leg.

[0128] In the example shown in the figure, the cross section of the upper section 21 in the horizontal direction is circular, and the cross section of the lower section 22 in the horizontal direction is square. Of course, the cross section of the upper section 21 can also be square, polygonal, etc., and the cross section of the lower section 22 can also be circular; in the example shown in the figure, the upper section 21 is a cylindrical structure, and a horizontally extending watertight compartment bulkhead plate 24 is arranged in the upper section 21 to divide the space in the upper section 21 into a plurality of ballast tanks 23 extending vertically. Of course, a vertically extending watertight compartment bulkhead plate 24 can also be arranged in the upper section 21, and the position where the vertically extending watertight compartment bulkhead plate 24 and the horizontally extending watertight compartment bulkhead plate 24 intersect is arranged along the central axis of the cylindrical structure. The lower section 22 is also divided into a plurality of ballast tanks 23 by a plurality of vertically extending watertight compartment bulkhead plates 24 and horizontally extending watertight compartment bulkhead plates 24, and the ballast tanks 23 can be distributed in the horizontal direction and / or in the vertical direction.

[0129] Since the top of the upper section 21 will always be above the sea surface during wet dragging, the circular cross-section of the upper section 21 can improve the fluid dynamics performance of the upper section 21, and can more effectively reduce the impact and shaking caused by waves and ocean currents, thereby improving the stability of the power leg platform during wet dragging. The square shape of the lower section 22 allows the lower section 22 to have more space to accommodate the carrying water, so that the floating body 20 has a better ballast effect. In order to ensure that each floating body 20 is subjected to uniform force, the central axis of the upper section 21 coincides with the center line of the lower section 22.

[0130] Optionally, in order to increase the structural strength of the upper section 21 of the cylindrical structure, a plurality of reinforcing ribs are provided on the inner wall of the upper section 21, the reinforcing ribs extend in the axial direction, and the two ends of the reinforcing ribs respectively abut against the top wall and the bottom wall of the upper section 21. The plurality of reinforcing ribs are evenly distributed along the circumference of the upper section 21.

[0131] In the above embodiment, one lower section 22 is provided with a U-shaped connecting arm 221, the installation position of the U-shaped connecting arm 221 and the lower section 22 is spaced from the edge of the lower section 22, and the other lower section 22 is provided with a plate-shaped connecting arm 222, the installation position of the plate-shaped connecting arm 222 and the corresponding lower section 22 is spaced from the edge of the lower section 22, and the plate-shaped connecting arm 222 and the U-shaped connecting arm 221 are plugged and locked along the radial direction of the wrist 12; in this way, there is a certain interval between the two floating bodies 20, and an accommodating space 26 is enclosed between the two floating bodies 20 and the outer wall of the U-shaped connecting arm 221, and at least part of the buoy 4 is located in the accommodating space 26. Further, the line connecting the center of the buoy 4 and the center of one buoy 20 is l1, and the line connecting the center of the buoy 4 and the center of the other buoy 20 is l2, and the angle between l1 and l2 is greater than 100°. The marine transport tooling 2 is provided with an installation channel 223 for installing the wrist 12, and the installation channel 223 axially penetrates the U-shaped connecting arm 221 and the plate-like connecting arm 222; the two side arm sections 221a of the U-shaped connecting arm 221 are each provided with a first installation groove 221b, and the plate-like connecting arm 222 is provided with a second installation groove 222a; the groove wall of the first installation groove 221b constitutes part of the wall of the installation channel 223, and the groove wall of the second installation groove 222a constitutes part of the wall of the installation channel 223, thereby enabling the marine transport tooling 2 to be connected to each wrist 12.

[0132] Specifically, the plug-in U-shaped connecting arm 221 has two opposite side arm sections 221a and a bottom arm section 221c connected between the two side arm sections 221a, the bottom arm section 221c extends along the axial direction of the wrist 12 and is fixedly connected to the lower section 22, and the side arm sections 221a are each provided with a first mounting groove 221b; the plate-like connecting arm 222 is provided with a second mounting groove 222a; after the plate-like connecting arm 222 is plugged into the U-shaped connecting arm 221, part of the groove wall of the first mounting groove 221b is pressed against part of the side wall of the wrist 12, and part of the groove wall of the second mounting groove 222a is pressed against part of the side wall of the wrist 12.

[0133] The marine transport tooling 2 further includes a locking member 27, which sequentially penetrates the side arm section 221a and the plate-shaped connecting arm 222 in the axial direction to lock the plate-shaped connecting arm 222 with the U-shaped connecting arm 221. The locking member 27 is a locking pin or a plug rod, which is used to lock the two floating bodies 20 in the axial and radial directions of the wrist 12. Two locking members 27 are provided in the height direction, one is located on the upper side of the wrist 12, and the other is located on the lower side of the wrist 12.

[0134] In another optional solution, the offshore transport tooling 2 is located between the arm body 11 and the buoy 4. Specifically, one side of the U-shaped connecting arm 221 can be abutted against the buoy 4, and the other side can be abutted against the mounting column 3. This mounting position is convenient for installation and disassembly and will not interfere with the buoy 4 of the tension leg platform 100 itself.

[0135] Compared with the prior art, the offshore transport tooling 2 and the offshore wind power device in this application have the following advantages:

[0136] First, the offshore transport tooling 2 itself has sufficient stability. During the ballasting process of the offshore transport tooling 2, part of it is always above the sea surface, thereby providing sufficient stability support for the tension leg platform 100;

[0137] Second, the offshore transport tooling 2 and the tension leg platform 100 in the present application can be connected in water, which is simple, efficient and easy to operate;

[0138] Third, after the connection between the offshore transport tooling 2 and the tension leg platform 100 is completed, the towing of the tension leg platform 100 meets the stability requirements;

[0139] Fourthly, the buoy 20 can inject and discharge ballast water, so that the tension leg platform 100 can be submerged to the sea surface. During the entire submerging process, the stability of the tension leg platform 100 meets the requirements.

[0140] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An offshore wind power device, characterized in that: The offshore wind power device comprises a tension leg platform (100) and a wind turbine (200), wherein the tension leg platform (100) comprises a mounting column (3) and a tension arm (1), wherein the mounting column (3) is used to connect to the wind turbine (200), and the tension arm (1) comprises an arm body (11) connected to the mounting column (3) and a wrist (12) protruding from the arm body (11); the tension leg platform (100) is equipped with an offshore transport tooling, wherein the offshore transport tooling comprises a plurality of floating bodies (20), wherein the floating bodies (20) are connected to the wrist (12), and wherein a plurality of ballast tanks are arranged in the floating bodies (20) for injecting or discharging ballast water.

2. A method for installing an offshore wind power device, used for installing the offshore wind power device according to claim 1, characterized in that: include: s1. Towing the tension leg platform (100) and the wind turbine (200) to the assembly waters respectively; s2, injecting ballast water into the floating body (20) until the tension leg platform (100) is seated on the bottom; s3, completing the assembly of the fan (200) and the tension leg platform (100); s4, discharging the ballast water in the floating body (20); s5. Towing the assembled wind turbine (200) and the tension leg platform (100) to an installation water area, and connecting the tension leg platform (100) to the seabed of the installation water area.

3. The method for installing an offshore wind power device according to claim 2, characterized in that: The lower surface of each of the floating bodies (20) is also provided with a cylinder (25) with a bottom opening, and the bottom of the cylinder (25) can be inserted into the seabed to block the opening.

4. The method for installing an offshore wind power device according to claim 3, characterized in that: In s2, it also includes: s21. Inject ballast water into the floating body (20) so that the bottom of each cylinder (25) is inserted into the seabed of the assembly water area.

5. The method for installing an offshore wind power device according to claim 4, characterized in that: Also includes: s22. Adjust the negative pressure in each of the cylinders (25) to adjust the embedding depth of the cylinders (25) in the seabed.

6. The method for installing an offshore wind power device according to claim 3, characterized in that: In s4, it also includes: s41. Release the negative pressure in the cylinder (25) so that the cylinder (25) is separated from the seabed.

7. The method for installing an offshore wind power device according to any one of claims 1 to 6, characterized in that: In s1, it also includes: s11, rolling the tension leg platform (100) onto the semi-submersible vessel (300); s12. The semi-submersible vessel (300) sinks, and the tension leg platform (100) achieves self-floating under the action of the offshore transport tooling.

8. The method for installing an offshore wind power device according to claim 7, characterized in that: In s1 and s5, it also includes: s6. Controlling the injection or discharge of ballast water into the floating body (20) to adjust the draft of the tension leg platform (100).

9. The method for installing an offshore wind power device according to claim 8, characterized in that: In s6, when the floating body (20) sinks to a set depth, injection of ballast water into the floating body (20) is stopped, so that the upper part of the floating body (20) is always above the sea surface.

10. The method for installing an offshore wind power device according to any one of claims 2 to 6, characterized in that: The installation method further comprises: s7. A plurality of positioning piles (500) are provided in the installation water area, one end of the tension tendon (600) is connected to the corresponding positioning pile (500), and the other end is connected to the tension leg platform (100).

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