Transport ship, transport installation system and transport installation method for offshore wind power plant

Abstract

According to the transport ship for the offshore wind power device, the installation and transportation system and the installation and transportation method, the transport ship capable of being matched with the tension leg foundation is designed, and therefore the stability of the tension leg foundation in the whole transportation process is improved. The transport ship comprises a ship body, an inserting channel is defined by the ship body, and the inserting channel is used for inserting a tension arm of the tension leg foundation. The ship body is further provided with a hoisting part, and the hoisting part is arranged on the upper side of the inserting channel in a striding mode so as to hoist a buoy arranged at the far end of the tension arm. By the adoption of the transport ship, all the tension arms of the tension leg foundation are hoisted, and when the tension arms are submerged in water, the hoisting force of the hoisting part on the tension arms can complement the state that the overall stability of the tension leg foundation is lost after the tension arms or buoys at the ends of the tension arms are submerged in water; safe diving of the whole tension leg foundation is achieved, and the stability of the tension leg foundation during transportation can be achieved.

Description

Technical Field

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

[0002] With the continuous development of marine engineering technology, floating tension leg platform (TLP), as an important marine structure, has been widely used in deep-sea oil and gas development, offshore wind power and other fields. Through its unique tension leg foundation, the floating tension leg platform uses pre-tension to tightly connect the platform body with the seabed base, effectively resisting dynamic loads such as waves and currents in the marine environment, and providing a stable support environment for the upper structure.

[0003] During transportation, the tension leg foundation needs to withstand the influence of complex marine environments such as wind, waves, and currents. Its small size leads to low stability, and it is prone to dangerous situations such as tilting, shaking, and even capsizing. How to improve the stability of the tension leg foundation during transportation has always been pursued by those skilled in the art. Summary of the invention

[0004] The purpose of the present invention is to provide a transport ship, an installation and transportation system, and an installation and transportation method for offshore wind power equipment. By designing a transport ship that can be adapted to an offshore wind power tension leg foundation (a form of offshore wind power floating foundation), the stability of the tension leg foundation during the overall transportation process is improved.

[0005] To achieve the above-mentioned objectives, the present invention provides a transport ship for offshore wind power devices, the transport ship comprising a hull, the hull enclosing a plug-in channel, the plug-in channel being used to insert the tension arm of the tension leg foundation; the hull is also provided with a hoisting portion, the hoisting portion being arranged across the upper side of the plug-in channel to hoist a buoy arranged at the far end of the tension arm.

[0006] By adopting the transport ship in the present application, the tension arms of the tension leg foundation are hoisted. When the tension arms are submerged in water, the lifting force of the hoisting part on the tension arms can make up for the state of overall stability loss of the tension leg foundation caused by the tension arms or the buoys at the ends of the tension arms being submerged in water, thereby achieving safe diving of the entire tension leg foundation and achieving stability of the tension leg foundation during transportation.

[0007] Optionally, a plurality of limiting devices are provided in the plug-in channel, and the limiting devices are arranged at intervals along the width direction of the plug-in channel, and the area between the limiting devices is used to accommodate the buoy. By providing the limiting devices in the plug-in channel to limit the buoy in the horizontal direction, the buoy is connected to the plug-in channel in a limited direction in the horizontal direction, thereby avoiding the buoy from colliding with the wall of the plug-in channel.

[0008] Optionally, the hull has a towing condition and a hoisting condition. In the towing condition, the limiting device is in a limiting connection with the buoy. In the hoisting condition, the buoy is disengaged from the limiting connection with the limiting device.

[0009] Thus, the hull can operate on the whole of the offshore wind power device during the operations of towing and installation.

[0010] Optionally, the transport ship includes a first area and a second area distributed along the length direction of the hull; the plugging channel is provided in the first area, and the second area is used for placing at least one pile foundation. In this way, the part of the hull other than the plugging channel provided in its length direction can be used to carry and transport the pile foundation.

[0011] Optionally, a conveying assembly is further provided on the upper surface of the hull, and the conveying assembly is used for conveying the pile foundation to the plugging channel; the conveying assembly includes a supporting member for carrying the pile foundation. In the towing condition, the supporting member stops in the second area; in the hoisting condition, the supporting member can move between the first area and the second area. In the hoisting condition, the pile foundation can be hoisted, and multiple pile foundations can be hoisted in sequence, further improving the conveying, transporting and installation efficiency.

[0012] Optionally, the conveying assembly includes a track extending along the length direction of the hull, and the track is adapted to the supporting member; parts of the two tracks are located outside the plugging channel in the width direction of the hull, and part of them extends to the second area.

[0013] By providing a track extending along the length direction of the hull, the movement of the supporting member can be guided, ensuring the accuracy of the moving position of the supporting member.

[0014] Optionally, the supporting member is used for carrying a plurality of the pile foundations;

[0015] The supporting member includes a seat portion adapted to the track and a supporting portion rotatably connected to the seat portion; the supporting portion can rotate around a rotation axis and be maintained at a set angle, and the rotation axis extends along the height direction of the hull.

[0016] In this embodiment, by adopting a supporting portion that can rotate and be maintained at a set angle, the supporting portion can carry a plurality of pile foundations, facilitating the hoisting operation of the hoisting portion on the plurality of pile foundations in sequence.

[0017] A transportation system for an offshore wind power device includes a plurality of transport ships, and the transport ships can be respectively connected to the respective tension arms of the tension leg foundation in a one-to-one correspondence.

[0018] By using the transport ship in the present application, each tension arm of the tension leg foundation is lifted. When the tension arm is submerged in water, the lifting force of the lifting part on the tension arm can compensate for the lack of overall stability caused after both the tension arm or the buoy at the end of the tension arm are submerged in water, realizing the safe submergence of the entire tension leg foundation and enabling the stability during the transportation of the tension leg foundation.

[0019] A method for transporting and installing an offshore wind power device, comprising:

[0020] S1. Offshore assembly: Assemble the wind turbine and the tension leg foundation.

[0021] S2. Transport ship towing: Insert the tension arm into the insertion channel of the transport ship, connect the lifting part to the buoy arranged at the end of the tension arm, and the tension arm and the insertion channel are limitedly connected in the horizontal direction with the insertion channel.

[0022] S3. Tension leg transportation and installation: Release the limited connection, sink the buoy below the water surface, and the lifting part maintains the lifting of the tension arm at a set depth.

[0023] S4. Tension tendon connection: Hang the tension leg foundation on the pile foundation transported and installed on the seabed.

[0024] By using the transport ship in the present application, each tension arm of the tension leg foundation is lifted. When the tension arm is submerged in water, the lifting force of the lifting part on the tension arm can compensate for the lacking stability after both the tension arm or the buoy at the end of the tension arm are submerged in water, realizing the safe submergence of the entire tension leg foundation and enabling the stability during the transportation of the tension leg foundation.

[0025] Optionally, before the step S1, it further includes:

[0026] S1a. Transporting the pile foundation: The transport ship transports at least one of the pile foundations to a preset transport and installation location.

[0027] S1b. Lifting the pile foundation: The lifting part lifts the pile foundation.

[0028] Thus, it is also possible to transport and lift the pile foundation by the transport ship, further improving the functional integration degree of the transport ship and reducing the transport and installation cost of the tension leg foundation.

[0029] Through the following detailed description of the exemplary embodiments of the present specification with reference to the accompanying drawings, other features and advantages of the present specification will become clear. Description of the Drawings

[0030] The drawings incorporated in the specification and constituting a part of the specification illustrate the embodiments of the present specification, and together with the description thereof are used to explain the principles of the present specification.

[0031] Figure 1 It is a schematic structural diagram of the transportation and installation system and the offshore wind power device in the embodiment of the present invention;

[0032] Figure 2 It is a schematic structural diagram of the transport ship in the embodiment of the present invention;

[0033] Figure 3 It is one of the schematic flow diagrams of the assembly process of the offshore wind power device;

[0034] Figure 4 It is two of the schematic flow diagrams of the assembly process of the offshore wind power device;

[0035] Figure 5 It is three of the schematic flow diagrams of the assembly process of the offshore wind power device;

[0036] Figure 6 It is four of the schematic flow diagrams of the assembly process of the offshore wind power device;

[0037] Figure 7 It is five of the schematic flow diagrams of the assembly process of the offshore wind power device;

[0038] Figure 8 It is six of the schematic flow diagrams of the assembly process of the offshore wind power device;

[0039] Figure 9 It is seven of the schematic flow diagrams of the assembly process of the offshore wind power device;

[0040] Figure 10 It is a schematic diagram of the connection state between the hoisting part and the floating barrel;

[0041] Figure 11 It is a schematic diagram of the connection state between the transport ship and the tension arm;

[0042] Figure 12 It is one of the flowcharts of the installation process of the offshore wind power device by the transportation and installation system;

[0043] Figure 13 It is two of the flowcharts of the installation process of the offshore wind power device by the transportation and installation system;

[0044] Figure 14 It is three of the flowcharts of the installation process of the offshore wind power device by the transportation and installation system;

[0045] Figure 15 It is one of the schematic flowcharts of the process of the transport ship installing the pile foundation;

[0046] Figure 16 It is two of the schematic flowcharts of the process of the transport ship installing the pile foundation;

[0047] Figure 17Schematic diagram of the process of installing pile foundations on a transport ship, part three;

[0048] Figure 18 Schematic diagram of the process of installing pile foundations on a transport ship, part four;

[0049] Figure 19 Schematic diagram of the process of installing pile foundations on a transport ship, part five.

[0050] Reference numerals:

[0051] 1 - Hull; 11 - Main body; 12 - Split part; 13 - Insertion channel; L1 - Center line; 131 - Opening; 2 - Lifting part; 21 - Suspension beam; 22 - Vertical beam; 23 - Limiting device; 24 - Conveying component; 241 - Supporting member; 242 - Track; 3 - Offshore wind power device; 31 - Tension leg foundation; 311 - Tension arm; 313 - Buoy; 32 - Wind turbine; 5 - Semi - submersible ship; 6 - Offshore crane; 71 - First pile foundation; 72 - Second pile foundation; 73 - Third pile foundation; 8 - Tugboat. Detailed implementation manners

[0052] The present invention provides a transport ship, an installation and transportation system, and an installation and transportation method for an offshore wind power device. By designing a transport ship that can be adapted to a tension leg foundation, the stability of the tension leg foundation during the overall transportation process is improved.

[0053] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below with reference to the drawings and specific implementation manners.

[0054] Relative terms such as "first" and "second" are only used to distinguish one component with the same name from another, and do not necessarily require or imply any such actual relationship or order between these components.

[0055] Please refer to Figures 1 to 19 as shown Figure 1 is a schematic structural diagram of the installation and transportation system and the offshore wind power device in an embodiment of the present invention; Figure 2 is a schematic structural diagram of the transport ship in an embodiment of the present invention; Figure 3 is a schematic diagram of the process of assembling the offshore wind power device, part one; Figure 4 is a schematic diagram of the process of assembling the offshore wind power device, part two; Figure 5 is a schematic diagram of the process of assembling the offshore wind power device, part three; Figure 6 is a schematic diagram of the process of assembling the offshore wind power device, part four; Figure 7 is a schematic diagram of the process of assembling the offshore wind power device, part five; Figure 8 is a schematic diagram of the process of assembling the offshore wind power device, part six; Figure 9Schematic diagram of the assembly process of an offshore wind power device, part seven; Figure 10 Schematic diagram of the connection state between the hoisting part and the floating barrel; Figure 11 Schematic diagram of the connection state between the transport ship and the tension arm; Figure 12 Flow chart of the installation process of the offshore wind power device by the transport and installation system, part one; Figure 13 Flow chart of the installation process of the offshore wind power device by the transport and installation system, part two; Figure 14 Flow chart of the installation process of the offshore wind power device by the transport and installation system, part three; Figure 15 Schematic diagram of the process of the transport ship installing the pile foundation, part one; Figure 16 Schematic diagram of the process of the transport ship installing the pile foundation, part two; Figure 17 Schematic diagram of the process of the transport ship installing the pile foundation, part three; Figure 18 Schematic diagram of the process of the transport ship installing the pile foundation, part four; Figure 19 Schematic diagram of the process of the transport ship installing the pile foundation, part five.

[0056] To achieve the above object, the present invention provides a transport ship for an offshore wind power device 3. In the technical solution of the present application, the offshore wind power device 3 is composed of a tension leg foundation 31 and a wind turbine 32, wherein the tension leg foundation 31 undertakes the function of supporting the wind turbine 32. The tension leg foundation 31 includes two parts, a tension arm 311 and an installation column. The installation column extends vertically and is used to fix the wind turbine 32; the tension arm 311 is arranged circumferentially around the installation column and extends radially outward along it. For example, the tension leg foundation 31 shown in the figure is configured with three tension arms 311, which are evenly arranged around the installation column.

[0057] The tension arm 311 is a horizontally extending tubular beam, one end is connected to the installation column, and the other end continues to extend to form a distal end. The tension leg foundation 31 further includes a diagonal brace, which is obliquely arranged and supported between the installation column and the tension arm 311. A floating barrel 313 is installed at the distal end, and the distal end is the end of the tension arm 311 far from the installation column.

[0058] In the application, before the transport ship is used to tow the offshore wind power device 3 as a whole, the tension leg foundation 31 and the wind turbine 32 have been connected. The manner in which the tension leg foundation 31 and the wind turbine 32 are connected will be described in the subsequent part of the present application.

[0059] In some embodiments of the present application, as Figure 1 and Figure 2 shown, the transport ship includes a hull 1, and the hull 1 encloses an insertion channel 13. The insertion channel 13 is used to insert the tension arm 311 of the tension leg foundation 31.

[0060] Specifically, the hull 1 includes a main body portion 11 and two split portions 12 extending from the main body portion 11 in the length direction. The two split portions 12 are spaced apart in the width direction of the hull 1 to form the aforementioned insertion channel 13. The insertion channel 13 has an opening 131, and the opening 131 is located in the interval area between the ends of the two split portions 12 that are away from the main body portion 11. The midline of the insertion channel 13 in the length direction passes through the midpoint of the hull 1 in the width direction.

[0061] Combined Figure 1 、 Figure 2 And Figure 10 Moreover, the hull 1 is further provided with a lifting portion 2. The lifting portion 2 straddles the insertion channel 13 to lift and hold the buoy 313 provided at the distal end of the tension arm 311. The lifting portion 2 includes a suspension beam 21 located above the connection channel. The two ends of the suspension beam 21 in the width direction of the hull 1 are fixedly connected to the corresponding split portions 12 through vertical beams 22.

[0062] The suspension beam 21 is used to apply a lifting force to the tension arm 311. The suspension beam 21 can be located at the center of the hull 1 in the length direction, or can be biased towards the side where the main body portion 11 is located, or can be biased towards the side where the split portion 12 is located. Those skilled in the art can choose by themselves, as long as it is ensured that the suspension beam 21 is located below the insertion channel 13.

[0063] In this way, the suspension beam 21 can apply a lifting force to the tension arm 311 through the hook connected to the suspension beam 21, and at the same time, the hook can be further lowered to a set depth in the water.

[0064] By using the transport ship in this application, each tension arm 311 of the tension leg foundation 31 is lifted and held. When the tension arm 311 is immersed in water, the lifting force of the lifting portion 2 on the tension arm 311 can make up for the lack of stability of the tension leg foundation 31 after both the tension arm 311 or the buoy 313 at the end of the tension arm 311 are immersed in water, realizing the safe diving of the entire tension leg foundation 31 and ensuring the stability of the tension leg foundation 31 during transportation.

[0065] Furthermore, please continue to refer to Figure 10 There are several limiting devices 23 arranged in the insertion channel 13. The limiting devices 23 are spaced apart in the width direction of the insertion channel 13, and the area between the limiting devices 23 is used to accommodate the buoy 313.

[0066] In the technical solution shown in the figure, at least a part of the buoy 313 is located within the insertion channel 13. At this time, since the bottom of the transport ship is also submerged in water, a part of the insertion channel 13 will also be submerged in water along with the hull 1. In this embodiment, as long as it is ensured that the buoy 313 is located within the insertion channel 13, all of the buoy 313 can be submerged in water, or a part of the buoy 313 can be submerged in water and a part can protrude above the water surface. Those skilled in the art can choose by themselves during the actual operation.

[0067] The draft of the transport ship can be adjusted according to the actual situation. Specifically, the draft of the transport ship can be adjusted by injecting and discharging ballast water into the transport ship.

[0068] In this embodiment, the limiting device 23 can be a structure such as a foam stopper or metal beam members hinged to each other. Those skilled in the art can choose by themselves as long as it can achieve the horizontal limitation of the buoy 313.

[0069] By arranging the limiting device 23 within the insertion channel 13 to limit the buoy 313 in the horizontal direction, the buoy 313 can be prevented from colliding with the wall of the insertion channel 13.

[0070] As an alternative embodiment, a guiding portion extending along the length direction of the hull 1 (not shown in the figure) is further provided on the wall of the insertion channel 13. The guiding portion can be in rolling fit with the buoy 313. In this way, during the process of the buoy 313 being inserted into the insertion channel 13 horizontally through the opening 131, the guiding portion can ensure that the center of the buoy 313 is always located on the center line of the insertion channel 13. Here, the center line of the insertion channel 13 extends along the length direction of the hull 1, passes through the midpoint of the hull 1 in the width direction, and also passes through the midpoint of the insertion channel 13 in the width direction. Thus, during the process of limiting and connecting the buoy 313 to the wall of the insertion channel 13, the guiding portion plays a role in clamping the buoy 313.

[0071] In this way, during the process of connecting each tension arm 311 to the transport ship, the uniformity and consistency of the installation of each transport ship can be ensured, and the stability of towing the offshore wind power device 3 can be further improved.

[0072] The part of the guiding portion in contact with the buoy 313 can be in rolling fit with the buoy 313 in the height direction of the hull 1. Thus, during the process of the buoy 313 sinking, the limiting device 23 can play a role in limiting the buoy 313 in the horizontal direction and also play a role in sliding guidance in the vertical direction.

[0073] In another aspect of the present application, a transportation system for an offshore wind power device 3 is further provided. The transportation system includes a plurality of transport ships, and the transport ships can be connected to each tension arm 311 of the tension leg foundation 31 in a one-to-one correspondence. Specifically, in the example as shown in Figure 1 , the number of tension arms 311 is three, and the number of transport ships is also three, and they are connected to the distal ends of the tension arms 311 in a one-to-one correspondence.

[0074] By using the transport ships in the present application, each tension arm 311 of the tension leg foundation 31 is lifted. When the tension arm 311 is submerged in water, the lifting force of the lifting part 2 on the tension arm 311 can make up for the lack of stability of the tension leg foundation 31 after both the tension arm 311 or the buoy 313 at the end of the tension arm 311 are submerged in water, realizing the safe diving of the entire tension leg foundation 31 and ensuring the stability during the transportation of the tension leg foundation 31.

[0075] To adapt to the aforementioned transportation system of the offshore wind power device 3, the present application further provides a transportation and installation method for the offshore wind power device 3, including:

[0076] s1. Offshore assembly: Assemble the wind turbine 32 and the tension leg foundation 31;

[0077] s2. Transport ship towing: Insert the tension arm 311 into the insertion channel 13 of the transport ship, connect the lifting part 2 to the buoy 313 arranged at the end of the tension arm 311, and the tension arm 311 is connected to the insertion channel 13 in a limited way in the horizontal direction;

[0078] s3. Tension leg transportation and installation: Lower the buoy 313 below the water surface, and the lifting part 2 maintains the lifting of the tension arm 311 at a set depth;

[0079] s4. Tension tendon connection: Hang the tension leg foundation 31 on the pile foundation transported and installed on the seabed.

[0080] Since the improvement of the technical solution of the present application mainly involves s2 and s3, s2 and s3 will be described first.

[0081] In s2, as shown in Figure 10 and Figure 11 , drive the transport ship to approach the corresponding tension arm 311, and make the opening 131 of the insertion channel 13 face the tension arm 311. At this time, the length direction of the hull 1 is parallel to the extension direction of the tension arm 311. Drive the transport ship to sail towards the side where the tension arm 311 is located until the tension arm 311 gradually enters the insertion channel 13.

[0082] At this time, the buoy 313 can be docked with the guiding part and move along the center line of the insertion channel 13 under the guiding action of the guiding part.

[0083] After the buoy 313 moves to the lower side of the suspension beam 21, the hook is connected to the upper end of the floating body. The aforementioned limiting device 23 is filled between the floating body and the wall of the insertion channel 13. A limiting device 23 can also be provided between the part of the tension arm 311 located in the insertion channel 13 and the wall of the insertion channel 13 to limit the buoy 313 in the horizontal direction. However, in the vertical direction, the buoy 313 can move. During this process, a part of the buoy 313 is above the water surface, and the hoisting part 2 maintains a lifting force on the buoy 313.

[0084] In the aforementioned manner, after each tension arm 311 is correspondingly connected to the transport ship, one of the transport ships is started to tow the offshore wind power device 3.

[0085] In this embodiment, a driving member capable of driving the hull 1 to move in all directions, such as a propeller, is provided at the bottom of each transport ship, so that each transport ship has the function of self-positioning.

[0086] During the towing process, the three transport ships can be controlled together through the control system. Not only can the towing direction of the offshore wind power device 3 be adjusted by controlling the sailing direction of the transport ship, but also the circumferential position of the offshore wind power device 3 can be adjusted by controlling the transport ship to adjust the different orientations of the wind turbine 32 during the transportation process.

[0087] By adopting the method in the present application, propeller devices are equipped at the bottom of each transport ship. These propeller devices are integrated at the bottom of the hull 1 through modular design. Specifically, the propulsion system of the transport ship is composed of four groups or six groups or more independently controlled propeller units.

[0088] During the towing stage, by adjusting the propeller thrust and direction of each transport ship, a controllable rotational torque is formed, and the three transport ships can be cooperatively controlled to achieve the functions of adjusting the course of the offshore wind power device 3 and the circumferential position of the wind turbine 32.

[0089] In S3, as Figure 12 shown, the transport ship transports the tension leg foundation 31 to the installation site, and the installation position of the tension leg foundation 31 is positioned by controlling each transport ship.

[0090] After completing the offshore positioning operation and confirming that the position is accurate, the connection release operation between the tension leg foundation 31 and the transport ship is performed.

[0091] Specifically, after unloading the limiting device 23 from between the buoy 313 and the tension arm 311, the tension leg foundation 31 is decoupled from the transport ship. Subsequently, the ballast water system of the tension leg foundation 31 is started, and seawater is injected into each ballast tank through the ballast tank pipeline preset in the tension leg foundation 31. During this process, ensure that the tension leg foundation 31 maintains longitudinal and lateral stability during the weight gain process.

[0092] During the injection of ballast water, the lifting part 2 synchronously enters the working state. The lifting tool of the lifting part 2 is reliably connected to the lifting point at the top of the buoy 313 of the tension leg foundation 31 through a special lifting ear. When the ballast water is injected into the tension leg foundation 31, the lifting part 2 applies a pre-tightening force until both the tension arm 311 and the buoy 313 are submerged in water. Control the lifting part 2 to lower the tension leg foundation 31. During the lowering process, the stability of the tension leg foundation 31 is maintained jointly by the lifting force of the lifting part 2 and the gravity of the ballast water. Thus, the transport ship can be used to lower the tension leg foundation 31 during the installation process, and at the same time, the stability of the tension leg foundation 31 during the installation process is ensured.

[0093] As Figure 14 shown, then perform S4 to connect the tension leg foundation 31 with the pile foundation installed on the seabed for transportation. The connection operation is an existing technology in this field and will not be elaborated here.

[0094] The following specifically describes S1. The transport ship of the present application is adapted to the overall offshore wind power device 3. In S1, the assembly process of the tension leg foundation 31 and the wind turbine 32 before towing is mainly described.

[0095] In S1, for the wind turbine 32 and the tension leg foundation 31, wet towing or dry towing methods can be adopted. For the tension leg foundation 31, the wet towing method is preferably adopted;

[0096] As Figure 3 、 Figure 4 and Figure 5 shown, roll the tension leg foundation 31 onto the semi-submersible ship 5; after the semi-submersible ship 5 transports the tension leg foundation 31 to the designated position, the semi-submersible ship 5 sinks, and the tension leg foundation 31 realizes self-floating. As Figure 6 shown, the self-floating tension leg foundation 31 is towed to the set assembly location by the tugboat 8.

[0097] Please refer to Figure 7 , after the tension leg foundation 31 is transported to the designated location, inject ballast water into the floating body until the tension leg foundation 31 sits on the bottom. After confirming that the tension leg foundation 31 is stable on the bottom, stop injecting ballast water into the floating body.

[0098] In this step, in order to increase the wind resistance capacity after the connection between the tension leg foundation 31 and the wind turbine 32, the tension leg foundation 31 can be fixed to the seabed through physical connection. Specifically, mooring tools (such as anchor chains, suction anchors or gravity anchors) can be arranged at the bottom of the tension leg foundation 31. The mooring tools can design the anchor chain length, pre-tension and anchor point layout according to the wind and wave loads to form a stable anti-overturning system. In addition, several positioning piles can also be sunk into the seabed at the assembly site, and an integral structure can be formed through the rigid connection between the positioning piles and the foundation. The positioning piles are used to provide sufficient uplift bearing capacity.

[0099] After the tension leg foundation 31 completes the bottom-sitting operation, its own weight will be mainly borne by the seabed, and this characteristic lays a solid foundation for the subsequent installation of the wind turbine 32.

[0100] After confirming that the tension leg foundation 31 is in a stable state and all installation conditions are met, the assembly work of the wind turbine 32 begins.

[0101] Specifically, as Figure 8 and Figure 9 shown, with the aid of the offshore crane 6 equipment, the wind turbine 32 can be accurately hoisted onto the tension leg foundation 31 and tightly connected to the installation column.

[0102] When performing the assembly process of the wind turbine 32 and the tension leg foundation 31, the offshore crane 6 can be used to vertically lift the wind turbine 32 and then accurately lower it into the installation column, thereby realizing the stable docking of the wind turbine 32 and the tension leg foundation 31.

[0103] After the assembly is completed, the ballast water in the floating body is drained. As the ballast water is drained, under the action of buoyancy, the tension leg foundation 31 will gradually rise, thereby driving the entire offshore wind power device 3 to float up and be completely separated from the seabed.

[0104] After complete separation, the aforementioned s2 can be carried out to tow the entire offshore wind power device 3.

[0105] In another invention of the present application, the transport ship can also transport and install the pile foundation. Specifically, the transport ship includes a first area and a second area distributed along the length direction of the hull 1; a plugging channel 13 is provided in the first area, and the second area is used to place at least one pile foundation. The first area is located at the split part 12, and the second area is located at the main body part 11. In this way, the part of the hull 1 other than the plugging channel 13 provided in its length direction can be used to carry and transport the pile foundation.

[0106] Specifically, a conveying assembly 24 is further provided on the upper surface of the hull 1, and the conveying assembly 24 is used to convey the pile foundation to the plugging channel 13; the conveying assembly 24 includes a supporting member 241 for carrying the pile foundation, and the conveying assembly 24 includes a track 242 extending along the length direction of the hull 1, and the track 242 is adapted to the supporting member 241.

[0107] In a more specific example, the supporting member 241 is used to carry a plurality of pile foundations; the supporting member 241 includes a seat portion adapted to the track 242 and a supporting portion rotatably connected to the seat portion; the supporting portion can rotate around the rotation axis and be maintained at a set angle, and the rotation axis extends along the height direction of the hull 1. The supporting portion is adapted to two tracks 242 and is slidably or rollably adapted to the two tracks 242. Part of the two tracks 242 is located outside the insertion channel 13 in the width direction of the hull 1, and part extends to the second area.

[0108] In this embodiment, by adopting a supporting portion that can rotate and be maintained at a set angle, the supporting portion can carry a plurality of pile foundations, facilitating the hoisting operation of the hoisting portion 2 for the plurality of pile foundations in sequence. In addition, by arranging the track 242 extending along the length direction of the hull 1, the movement of the supporting member 241 can be guided, ensuring the accuracy of the moving position of the supporting member 241.

[0109] In the towing condition, the supporting member 241 is stopped in the second area; in the hoisting condition, the supporting member 241 can move between the first area and the second area. In the hoisting condition, the pile foundation can be hoisted, and a plurality of pile foundations can be hoisted in sequence, further improving the conveying and transportation and installation efficiency.

[0110] The transportation and installation method of the pile foundation will be further described below. Here, the pile foundation is a suction bucket structure, and of course, it can also be other types of pile foundations.

[0111] In this embodiment, the transportation and installation of the pile foundation are completed before towing the tension leg foundation 31. Specifically, before s1, it further includes:

[0112] s1a. Transport the pile foundation: The transport ship transports at least one pile foundation to a preset transport and installation location;

[0113] s1b. Hoist the pile foundation: The hoisting portion 2 hoists the pile foundation.

[0114] Thus, the pile foundation can also be transported and hoisted by the transport ship, further improving the functional integration degree of the transport ship and reducing the transport and installation cost of the tension leg foundation 31.

[0115] In the example shown in the figure, each supporting portion of the transport ship carries three pile foundations, and the three pile foundations are circumferentially spaced apart around the rotation axis. The supporting portion is located in the first area at this time. The three pile foundations are respectively defined as the first pile foundation 71, the second pile foundation 72, and the third pile foundation 73.

[0116] In as Figure 15In the example shown, rotate the driving support part to rotate the center of the first pile foundation 71 to the center line of the insertion channel 13, and then drive the seat part to move in the direction close to the hoisting part 2 relative to the sliding rail until it slides to the lower side of the hanging beam 21. Then connect the hook to the lifting point at the top of the first pile foundation 71, and hoist the first pile foundation 71 until the first pile foundation 71 is separated from the support part and is located above the support part.

[0117] As Figure 16 shown, then drive the seat part to move reversely along the track 242 to the second area to avoid the insertion channel 13. Lower the first pile foundation 71 into the mud through the hoisting part 2.

[0118] As Figure 17 shown, rotating the driving support part can be clockwise or counterclockwise rotation, which can be selected by those skilled in the art. When the support part rotates, the second pile foundation 72 and the third pile foundation 73 located thereon are driven to rotate, and the center of the second pile foundation 72 is rotated to the center line of the insertion channel 13, so as to align with the insertion channel 13.

[0119] As Figure 18 shown, repeat the foregoing actions, drive the seat part to move to the first area to be located under the hanging frame, connect the hook to the lifting point at the top of the second pile foundation 72, and hoist the second pile foundation 72 so that the second pile foundation 72 is far away from the support part.

[0120] As Figure 19 shown, drive the seat part away from the first area to avoid the insertion channel 13, and then use the hoisting part 2 to lower the second pile foundation 72 into the mud.

[0121] Repeat the foregoing actions to complete the operation of driving the third pile foundation 73 into the mud. Thus, the transportation and installation operation of the pile foundation by the transport ship is completed.

[0122] Next, a specific embodiment is used to illustrate the parameters of the transport ship of the present application. It is only an optional method and does not constitute a limitation to the present application.

[0123] The hoisting part 2 of the transport ship adopts a gantry crane device. The gantry crane device can provide a hoisting force of 2000t and a hoisting depth of 500m. Thus, the overall transportation and installation system can carry a marine wind power device 3 far greater than 6000t, and can far meet the characteristics of the large-scale existing marine wind power transportation devices. In addition, the hoisting depth of 500m can also meet the requirements of deep-sea operations.

[0124] In this mode, the towing speed of the overall transportation and installation system can be controlled at 8 knots - 10 knots, and the speed of a single transport ship can be 12 knots.

[0125] During the process of transporting and installing pile foundations using a transport ship, taking the suction pile as an example of the pile foundation, the transport ship can transport 3 suction piles with a diameter of 25 m, a height of 30 m, and a weight of 1500 t at a time and complete the pile driving operation of the suction piles.

[0126] Compared with the prior art, the advantages of the present application are as follows:

[0127] First, the transport ship can complete the towing and installation operations of the entire offshore wind power device 3. By using the transport ship in the present application, each tension arm 311 of the tension leg foundation 31 is lifted. When the tension arm 311 is submerged in water, the lifting force of the lifting part 2 on the tension arm 311 can make up for the lack of stability of the tension leg foundation 31 after both the tension arm 311 or the buoy 313 at the end of the tension arm 311 are submerged in water, realizing the safe submergence of the entire tension leg foundation 31 and the stability during the transportation of the tension leg foundation 31.

[0128] Second, the transport ship can also realize the towing and installation operations of the pile foundation.

[0129] By adopting a supporting part that can rotate and be maintained at a set angle, the supporting part can carry multiple pile foundations, facilitating the lifting operation of the lifting part 2 on multiple pile foundations in sequence. In addition, by setting the track 242 extending along the length direction of the hull 1, it can play a guiding role in the movement of the supporting member 241 and ensure the accuracy of the moving position of the supporting member 241.

[0130] In this article, specific examples are used to elaborate on the principle and implementation mode of the present invention. The description of the above embodiments is only used to help understand the core idea of the present invention. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A transport ship for offshore wind power installations, characterized in that: The invention comprises a hull (1), wherein the hull (1) encloses a plug-in channel (13), and the plug-in channel (13) is used to insert a tension arm (311) of a tension leg foundation (31); The hull (1) is also provided with a hoisting portion (2), and the hoisting portion (2) is arranged across the upper side of the plug-in channel (13) to suspend the tension arm (311).

2. The offshore wind turbine transport vessel according to claim 1, characterized in that: A plurality of limiting devices (23) are arranged in the plug-in channel (13), and the limiting devices (23) are arranged at intervals along the width direction of the plug-in channel (13), and the area between the limiting devices (23) is used to accommodate the float (313).

3. The offshore wind turbine transport vessel according to claim 2, characterized in that: The hull (1) has a towing condition and a hoisting condition. In the towing condition, the limiting device (23) is connected to the buoy (313) in a limiting manner. In the hoisting condition, the buoy (313) is released from the limiting connection with the limiting device (23).

4. The offshore wind turbine transport vessel according to claim 1, characterized in that: The transport ship comprises a first area and a second area distributed along the length direction of the hull (1); The first area is provided with the insertion channel (13), and the second area is used to place at least one pile foundation.

5. The offshore wind turbine transport ship according to claim 4, characterized in that: The upper surface of the hull (1) is also provided with a conveying assembly (24), and the conveying assembly (24) is used to convey the pile foundation to the insertion channel (13); the conveying assembly (24) includes a supporting member (241) for carrying the pile foundation, and in the towing condition, the supporting member (241) stops at the second area; In the hoisting condition, the supporting member (241) is capable of moving between the first area and the second area.

6. The offshore wind turbine transport ship according to claim 4, characterized in that: The conveying assembly (24) comprises a track (242) extending along the length direction of the hull (1), and the track (242) is adapted to the supporting member (241); Parts of the two rails (242) are located outside the insertion channel (13) in the width direction of the hull (1), and partly extend to the second area.

7. The offshore wind turbine transport vessel according to claim 6, characterized in that: The supporting member (241) is used to support a plurality of the pile foundations; The supporting member (241) comprises a seat portion adapted to the track (242) and a support portion rotatably connected to the seat portion; the support portion is capable of rotating around a rotation axis and being maintained at a set angle, and the rotation axis extends along the height direction of the hull (1).

8. A transportation and installation system for an offshore wind power device, characterized in that: It comprises several transport ships for offshore wind power installations as described in any one of claims 1 to 7, and the transport ships can be connected one-to-one with each tension arm (311) of the tension leg foundation (31).

9. A method for transporting and installing an offshore wind power device, characterized in that: The transport and installation system for an offshore wind power device according to claim 8, wherein the transport and installation method for an offshore wind power device comprises: s1. Offshore assembly: assembling the wind turbine (32) and the tension leg foundation (31); s2. Towing by transport ship: insert the tension arm (311) into the plug-in channel (13), connect the hoisting part (2) to the buoy (313) arranged at the end of the tension arm (311), and the tension arm (311) is limitedly connected to the plug-in channel (13); s3. Transport and install the tension leg: release the limit connection, so that the buoy (313) sinks below the water surface, and the hoisting part (2) keeps the tension arm (311) hoisted at the set depth; s4. Tension tendon connection: The tension leg foundation (31) is connected to the pile foundation transported and installed on the seabed.

10. The method for transporting and installing an offshore wind power device according to claim 9, characterized in that: Before the s1, it also includes: s1a, transporting pile foundations: the transport ship transports at least one of the pile foundations to a preset transport and installation location; s1b. Hoisting the pile foundation: the hoisting unit (2) hoists the pile foundation.

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