A marine converter station

Abstract

The application discloses a marine converter station and relates to the technical field of offshore wind power generation, which comprises a converter station hull, a pile leg device and a positioning pipe pile, and converter station function modules are integrated on the converter station hull. The converter station hull is configured as a structure capable of floating on the sea surface, so that the converter station can be directly towed on the sea, thereby simplifying the transportation link. A plurality of pile leg devices are connected with the converter station hull, and the pile leg devices are liftable relative to the converter station hull through lifting devices. The lifting devices are detachably connected with the converter station hull and the pile leg devices, so that the lifting devices can be removed after installation and recycled for other projects, thereby reducing equipment costs. A skirt pile sleeve is arranged on the pile leg device, the positioning pipe pile is arranged in the skirt pile sleeve, and the positioning pipe pile is grouted and fixed with the skirt pile sleeve, so as to form a permanent foundation with high bearing capacity and improve the stability and safety of the marine converter station under long-term load and extreme sea conditions.

Description

Technical Field

[0001] This application relates to the field of offshore wind power technology, and more specifically, to an offshore converter station. Background Technology

[0002] As offshore wind farms expand into deeper waters, offshore converter stations have become the mainstream solution for high-voltage direct current (HVDC) transmission to reduce long-distance power transmission losses. However, existing offshore converter stations are enormous and extremely heavy; the superstructure of a 1GW converter station weighs 20,000-30,000 tons, far exceeding the single-piece lifting capacity of conventional crane vessels (approximately 7,000-8,000 tons). While relying on 10,000-ton crane vessels or using floating installation methods are feasible, the former is costly and difficult to deploy, while the latter requires specialized supporting facilities and 10,000-ton barges, and is subject to stringent sea conditions and has a very short construction window.

[0003] In summary, both large-scale hoisting and floating installation face the common challenges of high costs, long construction periods, and significant risks. Therefore, providing a marine converter station that simplifies the installation process, reduces costs, and shortens the construction period has become a pressing technical problem for those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of this application is to provide an offshore converter station that simplifies the installation process, reduces costs, and shortens the construction period.

[0005] A marine converter station, comprising:

[0006] The converter station hull integrates converter station functional modules and is constructed to float on the sea surface.

[0007] The pile leg device, a plurality of the pile leg devices are connected to the hull of the converter station. The pile leg device is raised and lowered relative to the hull of the converter station via a lifting device. The lifting device is detachably connected to both the hull of the converter station and the pile leg device. The pile leg device is provided with a skirt pile sleeve.

[0008] The positioning pipe pile is inserted through the skirt pile sleeve and fixed to the skirt pile sleeve by grouting.

[0009] In some embodiments, the lifting device includes:

[0010] The fixed ring beam is through which the pile leg device passes, and the fixed ring beam is detachably connected to the hull of the converter station.

[0011] The pile leg device passes through the moving ring beam;

[0012] A pin system, comprising a first pin and a second pin, wherein the first pin is disposed on the fixed ring beam and the second pin is disposed on the moving ring beam, and the pile leg device is provided with a plurality of first pin holes for the insertion of the first pin and a plurality of second pin holes for the insertion of the second pin, wherein the first pin holes are spaced apart along the extension direction of the pile leg device and the second pin holes are spaced apart along the extension direction of the pile leg device.

[0013] The main lifting cylinder has one end connected to the fixed ring beam and the other end connected to the moving ring beam.

[0014] In some embodiments, the lifting device includes:

[0015] A steel strand, one end of which is detachably connected to the top of the pile leg device, and the other end of which is detachably connected to the bottom of the pile leg device;

[0016] The hydraulic drive unit includes a first hydraulic cylinder, a second hydraulic cylinder, a clamping mechanism, a locking mechanism, and a main cylinder. The first hydraulic cylinder is tractively connected to the clamping mechanism to drive the clamping mechanism to clamp or release the steel strand. The second hydraulic cylinder is tractively connected to the locking mechanism to drive the locking mechanism to clamp or release the steel strand, and the locking mechanism is configured to clamp the steel strand to prevent it from falling back when the clamping mechanism releases it. The main cylinder is connected between the first hydraulic cylinder and the second hydraulic cylinder, and one of the first hydraulic cylinder and the second hydraulic cylinder is detachably connected to the hull of the converter station.

[0017] In some embodiments, one of the pile leg devices corresponds to a plurality of the lifting devices, and each of the lifting devices is arranged at equal intervals around the circumference of the pile leg device.

[0018] In some embodiments, the pile leg assembly includes:

[0019] The pile leg body, the lifting device is detachably connected to the pile leg body, and the converter station hull is connected to the pile leg body;

[0020] A pile boot is disposed at the bottom of the pile leg body and is used to support the seabed. At least one of the pile leg body and the pile boot is provided with the skirt pile sleeve.

[0021] In some embodiments, both the pile leg body and the pile shoe are provided with the skirt pile sleeve, the skirt pile sleeve on the pile leg body and the skirt pile sleeve on the pile shoe are connected in a one-to-one correspondence, and the positioning pipe pile is sequentially passed through the skirt pile sleeve on the pile leg body and the skirt pile sleeve on the pile shoe.

[0022] In some embodiments, one of the pile leg devices corresponds to one or more of the positioning pipe piles, and the plurality of positioning pipe piles are arranged circumferentially around the pile leg device.

[0023] In some embodiments, the leg assemblies are arranged circumferentially around the hull of the converter station.

[0024] In some embodiments, the bottom of the converter station hull is constructed as a ship-shaped structure with a streamlined profile.

[0025] In some embodiments, a shock-absorbing device is provided between the converter station functional module and the converter station hull.

[0026] The offshore converter station provided in this application includes a converter station hull, leg units, and positioning pipe piles. The converter station hull integrates a converter station functional module, which combines power conversion, power quality purification, reactive power compensation, and intelligent control to achieve efficient and stable conversion between AC and DC power. The converter station hull is constructed to float on the sea surface, allowing for direct towing. Multiple leg units are connected to the converter station hull and can be raised and lowered relative to the hull via a lifting device. The lifting device is detachable from both the hull and the leg units, allowing it to be removed after installation and reused in other projects, thus reducing equipment costs. Furthermore, the lifting device only needs to meet the load requirements during the construction period and does not need to be designed to withstand long-term ultimate loads, further reducing manufacturing costs. Skirted pile sleeves are installed on the leg units, and the positioning pipe piles pass through these sleeves and are grouted to form a high-bearing-capacity permanent foundation.

[0027] During installation, the offshore converter station provided in this application is first towed to the installation area. Then, a lifting device is activated to lower the pile legs to the seabed and pre-stress them. Next, the converter station hull is raised to the designed height using the lifting device. Subsequently, positioning pipe piles are inserted into the skirt pile sleeves and driven to the designed depth using a hydraulic hammer. Finally, underwater grouting is performed to solidify the positioning pipe piles and skirt pile sleeves into a single, stable support. After the converter station hull is raised into position, it is fixed to the pile legs using welding, bolts, or other methods. Once fixed, the lifting device can be removed.

[0028] Compared to related technologies, the offshore converter station provided in this application has a self-floating hull that can be towed, simplifying the transportation process. The grouting permanent foundation system of skirt pile sleeves and positioning pipe piles significantly improves the stability and safety of the offshore converter station under long-term loads and extreme sea conditions. The detachable and reusable lifting device significantly reduces the investment cost and construction period of a single offshore converter station, providing strong support for the large-scale, low-cost development of offshore wind power. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of the offshore converter station disclosed in the embodiments of this application. Figure 1 ;

[0031] Figure 2 This is a schematic diagram of the structure of the offshore converter station disclosed in the embodiments of this application. Figure 2 ;

[0032] Figure 3 This is a schematic diagram of the installation of the offshore converter station disclosed in the embodiments of this application. Figure 1 ;

[0033] Figure 4 This is a schematic diagram of the installation of the offshore converter station disclosed in the embodiments of this application. Figure 2 ;

[0034] Figure 5 This is a schematic diagram of the installation of the offshore converter station disclosed in the embodiments of this application. Figure 3 ;

[0035] Figure 6 This is a schematic diagram of the installation of the offshore converter station disclosed in the embodiments of this application. Figure 4 ;

[0036] Figure 7 This is a schematic diagram of the structure of the first lifting device disclosed in the embodiments of this application;

[0037] Figure 8 This is a schematic diagram of the structure of the second type of lifting device disclosed in the embodiments of this application;

[0038] Figure 9 This is a diagram showing the calculation results of the pile shoe entering the mud in the embodiments of this application;

[0039] Figure 10This is a schematic diagram of the hull restoring arm and wind tilting arm of the converter station in the embodiments of this application;

[0040] Figure 11 This is a diagram showing the calculation results of the converter station hull stability in the embodiments of this application.

[0041] Among them, 100 represents the hull of the converter station;

[0042] 200 is the pile leg device, 210 is the skirt pile sleeve, 220 is the pile leg body, 221 is the first pin hole, 222 is the second pin hole, and 230 is the pile shoe.

[0043] 300 is the lifting device, 310 is the fixed ring beam, 320 is the moving ring beam, 330 is the first pin, 331 is the second pin, 340 is the main lifting cylinder, 350 is the steel strand, and 360 is the hydraulic drive unit.

[0044] 400 is a positioning pipe pile;

[0045] 600 is a self-propelled railcar, 610 is a semi-submersible barge, and 620 is a floating crane. Detailed Implementation

[0046] The core of this application is to disclose an offshore converter station that simplifies the installation process, reduces costs, and shortens the construction period.

[0047] Hereinafter, embodiments will be described with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the utility model as described in the claims. Additionally, the complete contents of the structures represented in the embodiments below are not limited to those necessary for the solution of the utility model as described in the claims. It should be noted that, for ease of description, only the parts relevant to the utility model are shown in the drawings. Unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0048] Combination Figures 1-2The offshore converter station disclosed in this application includes a converter station hull 100, a pile leg device 200, and positioning pipe piles 400. The converter station hull 100 integrates a converter station functional module, which integrates power conversion, power quality purification, reactive power compensation, and intelligent control to achieve efficient and stable conversion between AC and DC power. Its specific structure is prior art and will not be described further in this application. The converter station hull 100 is constructed to float on the sea surface, enabling direct towing at sea. Specifically, the lower structure of the converter station hull 100, from the ship's baseline to the height L (L=D+S) determined by the design draft D and freeboard S, is constructed according to ship structural standards to ensure its stability and safety as a floating foundation. The upper structure above height L is constructed according to the converter station design specifications to provide a stable and reliable installation and operation platform for the converter station functional module. By constructing the converter station hull 100 in sections, the differentiated structural performance requirements of different areas of the converter station hull 100 can be met.

[0049] Multiple pile leg devices 200 are connected to the converter station hull 100, and the pile leg devices 200 can be raised and lowered relative to the converter station hull 100 via lifting devices 300. The lifting devices 300 are detachable from both the converter station hull 100 and the pile leg devices 200, so that the lifting devices 300 can be removed after installation and reused in other projects, thus reducing equipment costs. The lifting devices 300 only need to meet the load during the construction period and do not need to be designed to withstand long-term ultimate loads, thereby further reducing the manufacturing cost of the lifting devices 300. A skirt pile sleeve 210 is provided on the pile leg device 200, and the positioning pipe pile 400 passes through the skirt pile sleeve 210 and is fixed with the skirt pile sleeve 210 by grouting to form a permanent foundation with high bearing capacity. The positioning pipe pile 400 can be a steel pile structure, and one pile leg device 200 can correspond to one or more positioning pipe piles 400, and multiple positioning pipe piles 400 can be arranged at intervals around the circumference of the pile leg device 200.

[0050] Combination Figures 3-6In the installation of the offshore converter station disclosed in this application, the converter station hull 100 is first towed to the installation area; then, the lifting device 300 is activated to lower the pile leg device 200, so that it touches the seabed and is pre-loaded; next, the converter station hull 100 is raised to the design height by the lifting device 300; then, the positioning pipe pile 400 is inserted into the skirt pile sleeve 210, and a hydraulic hammer is used to drive it to the design depth; finally, underwater grouting is carried out to solidify the positioning pipe pile 400 and the skirt pile sleeve 210 into one unit, forming a stable support, thereby realizing the one-step installation of the offshore converter station without the need for pre-laying a foundation. After the converter station hull 100 is raised to the position, the converter station hull 100 and the pile leg device 200 are fixed by welding, bolting, or other methods. After fixing, the lifting device 300 can be removed.

[0051] Compared to existing technologies, the offshore converter station disclosed in this application has a self-floating hull 100 that can be towed, simplifying the transportation process. The grouting permanent foundation system of the skirt pile sleeve 210 and the positioning pipe pile 400 significantly improves the stability and safety of the offshore converter station under long-term loads and extreme sea conditions, enabling long-term use of the offshore converter station. The detachable and reusable lifting device 300 significantly reduces the investment cost and construction period of a single offshore converter station, providing strong support for the large-scale, low-cost development of offshore wind power.

[0052] In some embodiments disclosed in this application, combined with Figure 7 The lifting device 300 includes a fixed ring beam 310, a moving ring beam 320, a pin system, and a main lifting cylinder 340. The pile leg device 200 passes through the fixed ring beam 310, and the fixed ring beam 310 is detachably connected to the converter station hull 100 by means of bolts, pins, etc. The pile leg device 200 passes through the moving ring beam 320. The pin system includes a first pin 330 and a second pin 331. The first pin 330 is disposed on the fixed ring beam 310, and the second pin 331 is disposed on the moving ring beam 320. On the pile leg device 200, multiple first pin holes 221 are provided for insertion of the first pin 330, and multiple second pin holes 222 are provided for insertion of the second pin 331. The first pin holes 221 and the second pin holes 222 are spaced apart along the extension direction of the pile leg device 200. One end of the main lifting cylinder 340 is connected to the fixed ring beam 310, and the other end is connected to the moving ring beam 320. Specifically, the first pin 330 and the second pin 331 can be driven to extend and retract by a third hydraulic cylinder and a fourth hydraulic cylinder, respectively. The third hydraulic cylinder can be mounted on the fixed ring beam 310, and the fourth hydraulic cylinder can be mounted on the moving ring beam 320.

[0053] During the lifting of the converter station hull 100, the first pin 330 is inserted into the first pin hole 221, while the second pin 331 exits from the second pin hole 222. At this time, the piston rod of the main lifting cylinder 340 extends to drive the moving ring beam 320 to rise to a preset stroke height. Then, the second pin 331 can be inserted into the corresponding second pin hole 222, and the first pin 330 can exit from the first pin hole 221. The piston rod of the main lifting cylinder 340 then retracts to drive the fixed ring beam 310 and the converter station hull 100 to move in the direction of the moving ring beam 320 until the first pin 330 is aligned with the next first pin hole 221 and inserted. Repeating the above steps can achieve the step-by-step continuous lifting of the converter station hull 100. The process of lowering the pile leg device 200 is the same as the process of lifting the converter station hull 100 described above, and will not be repeated here.

[0054] The fixed ring beam 310 and the moving ring beam 320 are coaxially arranged and are both ring structures through which the pile leg device 200 can pass. To ensure the stability of lifting, combined with Figure 7 There can be multiple main lifting cylinders 340, which are arranged at equal intervals around the axes of the fixed ring beam 310 and the moving ring beam 320.

[0055] In other embodiments disclosed in this application, combined with Figure 8 The lifting device 300 includes a steel strand 350 and a hydraulic drive unit 360. One end of the steel strand 350 is detachably connected to the top of the pile leg device 200, and the other end is detachably connected to the bottom of the pile leg device 200. The hydraulic drive unit 360 includes a first hydraulic cylinder, a second hydraulic cylinder, a clamping mechanism, a locking mechanism, and a main cylinder. The first hydraulic cylinder is driven by the clamping mechanism to drive the clamping mechanism to clamp or release the steel strand 350. The second hydraulic cylinder is driven by the locking mechanism to drive the locking mechanism to clamp or release the steel strand 350, and the locking mechanism is configured to clamp the steel strand 350 to prevent it from falling back when the clamping mechanism releases it. The main cylinder is connected between the first and second hydraulic cylinders, and one of the first and second hydraulic cylinders is detachably connected to the converter station hull 100. The specific structures of the clamping mechanism and the locking mechanism are existing technologies and will not be described in detail here.

[0056] Taking the detachable connection between the second hydraulic cylinder and the converter station hull 100 as an example, during the lifting of the converter station hull 100 or the lowering of the leg assembly 200, firstly, the locking mechanism clamps the steel strand 350 under the drive of the second hydraulic cylinder, while the first hydraulic cylinder drives the clamping mechanism to release the steel strand 350; subsequently, the main cylinder extends, pushing the clamping mechanism to rise one stroke relative to the locking mechanism along the steel strand 350; after moving into position, the first hydraulic cylinder first drives the clamping mechanism to clamp the steel strand 350, and the second hydraulic cylinder then drives the locking mechanism to release the steel strand 350; the main cylinder retracts, driving the locking mechanism to move towards the clamping mechanism, thereby realizing the lifting of the converter station hull 100; this cycle repeats, with the clamping mechanism and locking mechanism alternately performing the functions of active lifting and safety locking, realizing the continuous and stable lifting of the converter station hull 100. The process of lowering the converter station hull 100 relative to the leg assembly 200 is the reverse, and will not be described in detail here. In this embodiment, after the converter station hull 100 is raised into place, the steel strand 350 and the hydraulic drive unit 360 can be disassembled and reused, reducing costs.

[0057] Specifically, in combination Figure 8 One leg device 200 corresponds to multiple lifting devices 300, and the lifting devices 300 are arranged at equal intervals around the circumference of the leg device 200, thereby distributing the load evenly on the circumference of the leg device 200. This avoids local buckling or stress concentration of the leg device 200 that may be caused by excessive force at a single point, thus ensuring the structural stability and safety of the lifting process. At the same time, structural redundancy is achieved. When individual lifting devices 300 fail or require maintenance, the remaining lifting devices 300 can still work together to maintain basic functions, improving the fault tolerance and reliability of offshore operations.

[0058] In some embodiments disclosed in this application, the pile leg device 200 includes a pile leg body 220 and a pile shoe 230. A lifting device 300 is detachably connected to the pile leg body 220, and the converter station hull 100 is used to connect to the pile leg body 220. The pile shoe 230 is disposed at the bottom of the pile leg body 220 and used to support the seabed. At least one of the pile leg body 220 and the pile shoe 230 is provided with a skirted pile sleeve 210. The pile shoe 230 has a larger cross-sectional area than the pile leg body 220, which can disperse the contact pressure applied to the seabed during the preloading of the pile leg device 200, thereby providing stable support in the initial stage of installation. Based on this, the skirted pile sleeve 210 provided on the pile leg body 220 and / or the pile shoe 230 is used to accommodate and connect the positioning pipe piles 400 driven into deeper soil layers of the seabed, constituting a permanent anchoring system that provides the final bearing capacity. The skirted pile sleeve 210 is directly mounted on the pile leg body 220, providing strong resistance to bending and settlement. Furthermore, directly mounting the skirted pile sleeve 210 on the pile shoe 230 allows long-term loads to be directly transferred to the positioning pipe pile 400 via the pile shoe 230, resulting in a shorter and clearer force transmission path. The cross-sectional area of ​​the pile shoe 230 can be adaptively adjusted according to the seabed soil bearing capacity and design preloading requirements.

[0059] Furthermore, combined Figure 1 Both the pile leg body 220 and the pile shoe 230 can be equipped with a skirt pile sleeve 210, and the skirt pile sleeve 210 on the pile leg body 220 and the skirt pile sleeve 210 on the pile shoe 230 are connected in a one-to-one correspondence. The positioning pipe pile 400 can be sequentially inserted with the skirt pile sleeve 210 on the pile leg body 220 and the skirt pile sleeve 210 on the pile shoe 230. In this embodiment, by simultaneously installing the skirt pile sleeve 210 on the pile leg body 220 and the pile shoe 230, a functionally complementary composite foundation system is constructed, which significantly improves the overall performance: the skirt pile sleeve 210 and the positioning pipe pile 400 on the pile shoe 230 serve as the main load-bearing structure, directly transferring the huge vertical load of the converter station hull 100 to the foundation, ensuring the vertical bearing capacity of the foundation; while the skirt pile sleeve 210 on the pile leg body 220 provides horizontal restraint at a higher position, which can effectively resist lateral loads such as wind, waves and currents, greatly enhancing the bending stiffness and stability of the structure, thereby achieving a comprehensive response to complex marine loads.

[0060] To ensure the overall stability and structural safety of the offshore converter station during operation, multiple leg units 200 are evenly distributed circumferentially along the hull 100 of the converter station. The specific number and dimensions of the leg units 200 can be flexibly adjusted according to the total weight of the offshore converter station, its center of gravity height, and the environmental load of the operating sea area. For example, Figure 2 The diagram illustrates a technical solution where the number of pile leg devices 200 is eight.

[0061] To facilitate towing, the substructure of the converter station hull 100 can adopt a streamlined hull design and follow hull construction specifications to ensure the watertightness, lateral strength, and longitudinal strength of the converter station hull 100. Furthermore, by optimizing the cabin layout and internal frame of the converter station hull 100, the converter station hull 100 can have excellent stability and safety in both towing and self-floating states.

[0062] Furthermore, in order to isolate and absorb vibrations and impacts generated by waves, currents, etc., during navigation or operation of the converter station hull 100, and to ensure the safe and stable operation of the precision electrical components inside the converter station functional modules, a vibration damping device is also installed between the converter station functional modules and the converter station hull 100. For example, this vibration damping device can be a composite vibration isolation system composed of high-damping rubber, metal springs, or hydraulic dampers.

[0063] This application describes the offshore installation of the aforementioned offshore converter station using the following method, including the following steps:

[0064] S10, Converter station towing;

[0065] The offshore converter station will be towed to the installation area at sea. It should be noted that, to ensure safe and stable transportation, all legs 200 must be kept in a retracted state that does not affect towing when the tugboat is towing the offshore converter station to the installation area.

[0066] S20, lowering the pile legs;

[0067] Upon reaching the installation area, the leg device 200 is lowered to the seabed using the lifting device 300 and pre-loaded to ensure that the pile shoe 230 is in close contact with the seabed. After pre-loading is completed, the converter station hull 100 is raised to the preset height using the lifting device 300.

[0068] S30, Pipe pile fixing;

[0069] Insert the positioning pipe pile 400 into the skirt pile sleeve 210 and fix it with grout.

[0070] Specifically, the positioning pipe piles 400 can be transported to the installation area by a floating crane vessel 620 and lifted and inserted into the skirt pile sleeve 210; subsequently, a hydraulic hammer is used for pile driving until the positioning pipe piles 400 penetrate to the designed depth. After all the positioning pipe piles 400 have been driven, underwater grouting is performed to firmly connect the positioning pipe piles 400 and the skirt pile sleeve 210 into a whole.

[0071] The offshore converter station installation method disclosed in this application allows the offshore converter station to be constructed as a whole on shore, thus avoiding the high-cost and high-risk segmented assembly at sea. This application adopts overall towing and positioning, which is more adaptable to sea conditions, and only requires conventional tugboats and floating crane vessels 620 during installation, without the need to use ultra-large special crane vessels, making it suitable for offshore converter stations with larger capacities such as several GW. The entire process of this application avoids highly difficult offshore hoisting operations, significantly shortens the construction cycle, and greatly improves safety and controllability.

[0072] The steps preceding S10 include:

[0073] S00, Structural Construction and Drainage;

[0074] After the offshore converter station is built on the slipway, it is loaded and launched by the semi-submersible barge 610; or, after the offshore converter station is built in the dock, it is floated by filling with water and towed out of the port by tugboats.

[0075] Specifically, the construction method for offshore converter stations can be either slipway construction or dry dock construction, depending on the engineering conditions. Because the main structure has self-floating characteristics, the launching processes differ between the two methods: if slipway construction is used, the assembled offshore converter station must be transported as a whole to a semi-submersible barge 610 using an axle vehicle system or a self-propelled railcar 600, and then launched by the semi-submersible barge 610; if dry dock construction is used, the offshore converter station is directly floated by filling the dry dock with water, and then towed out of port. During construction, the main structures, such as the converter station hull 100 and the leg assembly 200, are all constructed using a segmented manufacturing and assembly method.

[0076] Furthermore, when the offshore converter station is constructed on a slipway, S10 specifically includes: after a tugboat tows a semi-submersible barge 610 to move the offshore converter station to a pre-designated anchorage, the semi-submersible barge 610 gradually submerges to its design draft through ballast sinking operations until the offshore converter station detaches from the support of the semi-submersible barge 610 and achieves floating separation on the water. Then, a tugboat tows the offshore converter station away from the semi-submersible barge 610 to the installation area at sea. This step, through the process of loading onto the ship, wet towing, separation, and re-towing, achieves efficient and safe transfer of the offshore converter station from the land-based construction site to the offshore installation area.

[0077] Combination Figure 10 and Figure 11 During the towing phase, to ensure the stability and directional control of the offshore converter station, it is necessary to monitor its buoy attitude, roll angle, pitch angle, and tow cable tension in real time. After entering the installation area, it is precisely positioned using anchoring or a dynamic positioning system, thus providing a precise initial state for the lowering of the leg assembly 200.

[0078] In some embodiments, S20 specifically includes: activating the lifting device 300 to gradually lower the leg assembly 200 until its pile shoe 230 touches the seabed and inserts into the mud layer. By adjusting the ballast water of the converter station hull 100 and using the weight of the converter station hull 100 to preload the leg assembly 200, the load-bearing capacity and seabed stability of the leg assembly 200 are verified. After the preload reaches the design requirements, the lifting device 300 lifts the converter station hull 100 off the water surface and raises it to the designed operating height, forming a self-elevating state. Combined with... Figure 9 The insertion depth of the pile shoe 230 needs to be determined during the design phase by comprehensively considering factors such as geological conditions, geometric dimensions of the pile shoe 230, and downward pressure, through insertion depth calculation, so as to ensure that after the preloading operation is completed, the top of the skirt pile sleeve 210 still maintains a certain safe distance from the mud surface.

[0079] S30 specifically includes: using a floating crane vessel 620 to drive the positioning pipe pile 400 into the skirt pile sleeve 210 to the designed penetration depth; underwater grouting is performed to connect the annular gap between the positioning pipe pile 400 and the skirt pile sleeve 210 to form an integral force-bearing system, thereby achieving reliable fixation of the offshore converter station.

[0080] Following S30 are:

[0081] S40. Acceptance;

[0082] The position of the pile leg device 200, the grouting status of the skirt pile sleeve 210, and the overall structural posture of the offshore converter station are inspected and accepted to ensure that the installation accuracy and structural safety meet the design requirements.

[0083] The terms "first" and "second," etc., used in the specification and claims of this application are used to distinguish different objects, not to describe a specific order, and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units may include steps or units not listed, but rather steps or units not listed. Additionally, in the description of embodiments in this application, "a plurality of" means two or more.

[0084] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Specific technical means in some embodiments may be incorporated, in whole or in part, into another embodiment unless explicitly excluded by another embodiment. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A marine converter station, characterized in that, include: The converter station hull (100) integrates converter station functional modules and is constructed to float on the sea surface. The pile leg device (200) is connected to the converter station hull (100). The pile leg device (200) is raised and lowered relative to the converter station hull (100) by a lifting device (300). The lifting device (300) is detachably connected to both the converter station hull (100) and the pile leg device (200). The pile leg device (200) is provided with a skirt pile sleeve (210). Positioning pipe pile (400), the positioning pipe pile (400) passes through the skirt pile sleeve (210) and is grouted and fixed to the skirt pile sleeve (210).

2. The offshore converter station as described in claim 1, characterized in that, The lifting device (300) includes: Fixed ring beam (310), the pile leg device (200) passes through the fixed ring beam (310), and the fixed ring beam (310) is detachably connected to the converter station hull (100); The moving ring beam (320) is through which the pile leg device (200) passes; A pin system, comprising a first pin (330) and a second pin (331), wherein the first pin (330) is disposed on the fixed ring beam (310) and the second pin (331) is disposed on the moving ring beam (320), wherein the pile leg device (200) is provided with a plurality of first pin holes (221) for inserting the first pin (330) and a plurality of second pin holes (222) for inserting the second pin (331), wherein the first pin holes (221) are spaced apart along the extension direction of the pile leg device (200) and the second pin holes (222) are spaced apart along the extension direction of the pile leg device (200); The main lifting cylinder (340) is connected at one end to the fixed ring beam (310) and at the other end to the moving ring beam (320).

3. The offshore converter station as described in claim 1, characterized in that, The lifting device (300) includes: A steel strand (350), one end of which is detachably connected to the top of the pile leg device (200), and the other end of which is detachably connected to the bottom of the pile leg device (200); A hydraulic drive unit (360) includes a first hydraulic cylinder, a second hydraulic cylinder, a clamping mechanism, a locking mechanism, and a main cylinder. The first hydraulic cylinder is operatively connected to the clamping mechanism to drive the clamping mechanism to clamp or release the steel strand (350). The second hydraulic cylinder is operatively connected to the locking mechanism to drive the locking mechanism to clamp or release the steel strand (350). The locking mechanism is configured to clamp the steel strand (350) to prevent it from falling back when the clamping mechanism releases the steel strand (350). The main cylinder is connected between the first hydraulic cylinder and the second hydraulic cylinder, and one of the first hydraulic cylinder and the second hydraulic cylinder is detachably connected to the converter station hull (100).

4. The offshore converter station as described in claim 3, characterized in that, One of the pile leg devices (200) corresponds to a plurality of the lifting devices (300), and each of the lifting devices (300) is arranged at equal intervals around the pile leg device (200) in the circumference.

5. The offshore converter station as described in claim 1, characterized in that, The pile leg assembly (200) includes: The pile leg body (220) is detachably connected to the lifting device (300), and the converter station hull (100) is connected to the pile leg body (220). A pile boot (230) is disposed at the bottom of the pile leg body (220) and is used to support the seabed. At least one of the pile leg body (220) and the pile boot (230) is provided with the skirt pile sleeve (210).

6. The offshore converter station as described in claim 5, characterized in that, Both the pile leg body (220) and the pile shoe (230) are provided with the skirt pile sleeve (210). The skirt pile sleeve (210) on the pile leg body (220) and the skirt pile sleeve (210) on the pile shoe (230) are connected in a one-to-one correspondence. The positioning pipe pile (400) is sequentially inserted through the skirt pile sleeve (210) on the pile leg body (220) and the skirt pile sleeve (210) on the pile shoe (230).

7. The offshore converter station as described in claim 1, characterized in that, One of the pile leg devices (200) corresponds to one or more of the positioning pipe piles (400), and the plurality of positioning pipe piles (400) are arranged circumferentially around the pile leg device (200).

8. The offshore converter station as described in claim 1, characterized in that, Each of the aforementioned leg devices (200) is arranged circumferentially around the converter station hull (100).

9. The offshore converter station as described in claim 1, characterized in that, The bottom of the converter station hull (100) is constructed as a ship-shaped structure with a streamlined profile.

10. The offshore converter station as described in claim 1, characterized in that, A shock-absorbing device is provided between the converter station functional module and the converter station hull (100).

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