Lifting system of offshore platform and offshore platform

Abstract

This invention relates to a lifting system for offshore platforms and the offshore platform itself. The lifting system includes a fixed pile frame, multiple lifting mechanisms, and a load-bearing mechanism. The fixed pile frame is used to fix the platform body to the offshore platform. Multiple lifting mechanisms are installed at intervals along the length of the fixed pile frame. Each lifting mechanism includes a frame and multiple gearboxes installed within the frame. Each gearbox is driven to connect with the platform's legs to drive the platform body to ascend and descend along the legs. The load-bearing mechanism is located between the frame and the fixed pile frame. Support beams are provided on the fixed pile frame at intervals corresponding to the intervals between two adjacent lifting mechanisms. The frame is installed between the fixed pile frame and the support beams, or between two adjacent support beams, or between the support beams and the platform body via the load-bearing mechanism. In this offshore platform lifting system, the load on the gearboxes of each lifting mechanism can be balanced, thereby greatly improving the overall utilization rate of the lifting system.

Description

Technical Field

[0001] This invention relates to the field of marine platform technology, and in particular to a lifting system for a marine platform and a marine platform. Background Technology

[0002] With the rapid development of marine engineering, jack-up platforms using truss legs and rack and pinion lifting are becoming increasingly larger and heavier, and are subject to increasingly harsher environmental conditions. Consequently, the load exerted by the hull on a single leg is also increasing, from several thousand tons to tens of thousands of tons. The load between the hull and the leg is transmitted through gearboxes. The support capacity of a single gearbox is generally 350-700 tons, and the greater the load on a single leg, the more gearboxes are required. Jack-up drilling platforms typically have 3-4 gearbox layers, while large jack-up wind turbine installation vessels now have 6-8 gearbox layers to achieve large loading and piling lifting capabilities.

[0003] In traditional technology, one end of the gearbox is fixed to the pile support, and the other end is connected to the pile legs via climbing gears, thus serving the functions of lifting, supporting, and locking. During the design of wind turbine installation vessels, it was found that as the number of gearbox layers increases, the support load borne by each gearbox becomes increasingly uneven. The lower gearboxes bear extremely high loads, even exceeding design limits, while the upper gearboxes bear relatively low loads, resulting in low overall utilization of the lifting system. For example... Figure 5 As shown, for a wind turbine installation vessel equipped with triangular truss legs and six gearboxes, the support capacity of a single gearbox is 575 tons. Using a traditional fixed rack and pinion lifting system, the bottom gearbox is easily overloaded, with a load imbalance reaching 50%. This means that when the bottom gearbox is fully loaded, the top gearbox only outputs 50% of its capacity. Furthermore, theoretically, the support capacity of a single leg chord is only about 4800 tons, far below the maximum support capacity of 6900 tons, resulting in an overall lifting system capacity utilization rate of only 70%. Summary of the Invention

[0004] One objective of this invention is to address the shortcomings of existing multi-level gearbox lifting systems, such as uneven load support among gearboxes, and to provide a lifting system for offshore platforms. To solve the above-mentioned technical problems, this invention adopts the following technical solution:

[0005] A lifting system for an offshore platform includes:

[0006] Stabilizing piles are used to secure the platform body of an offshore platform;

[0007] Multiple lifting mechanisms are installed at intervals along the length of the pile support frame. Each lifting mechanism includes a frame and multiple gearboxes installed within the frame. Each gearbox is connected to the pile leg drive of the offshore platform to drive the platform body to ascend and descend along the pile legs.

[0008] The load-bearing mechanism is located between the frame and the fixed pile frame;

[0009] Support beams are provided on the fixed pile frame at intervals between two adjacent lifting mechanisms. The frame is installed between the fixed pile frame and the support beams, or between two adjacent support beams, or between the support beams and the platform body through a load-bearing mechanism.

[0010] In one embodiment, the load-bearing mechanism includes a first load-bearing part, which is mounted on the top of the frame;

[0011] The top of the pile fixing frame is provided with a top beam, and the first load-bearing part is used to contact the lower surface of the top beam or the lower surface of the support beam.

[0012] In one embodiment, along the length of the pile frame, the stiffness of the first load-bearing portion on each frame decreases from top to bottom.

[0013] In one embodiment, the load-bearing mechanism further includes a second load-bearing part, which is installed at the bottom of the frame and is used to contact the upper surface of the support beam or the upper surface of the platform body.

[0014] In one embodiment, along the length of the pile fixing frame, the stiffness of the second load-bearing part on each frame is the same or decreases from top to bottom.

[0015] In one embodiment, the first load-bearing part is an elastically deformable element; and / or

[0016] The second load-bearing part is an elastically deformable component.

[0017] In one embodiment, the lifting system of the offshore platform further includes a guiding mechanism, which includes a first guiding component disposed on the frame, a second guiding component and a third guiding component disposed on the pile frame, and a fourth guiding component disposed on the platform body. The guiding mechanism is used to guide the vertical movement of the pile legs.

[0018] In one embodiment, the frame is provided with a first mounting channel for the rack of the pile leg to pass through, and the first guide assembly includes two first guide portions disposed opposite each other, which are located on both sides of the first mounting channel to correspond to the two sides of the rack of the pile leg respectively.

[0019] In one embodiment, the first guide portion includes a first guide plate, a second guide plate, and a third guide plate. The first guide plate and the second guide plate are respectively disposed on the two surfaces of the rack of the pile leg within the first mounting channel, and the third guide plate is disposed on the tooth tip of the rack of the pile leg within the first mounting channel.

[0020] In one embodiment, the first guide plate, the second guide plate, and the third guide plate are all detachably fixedly connected within the first mounting channel.

[0021] In one embodiment, the support beam is provided with a second mounting channel for the rack of the pile leg to pass through, and the second guide assembly includes two second guide portions disposed opposite to each other, which are located on both sides of the second mounting channel to correspond to the tooth tops on both sides of the rack of the pile leg.

[0022] In one embodiment, the top of the pile fixing frame is provided with a third mounting channel for the rack of the pile leg to pass through. The third guide assembly includes two third guide parts arranged opposite to each other. The two third guide parts are located on both sides of the third mounting channel to correspond to the tooth tops on both sides of the rack of the pile leg.

[0023] In one embodiment, the platform body is provided with a fourth mounting channel for the rack of the pile leg to pass through. The fourth guide component includes two fourth guide parts arranged opposite to each other. The two fourth guide parts are located on both sides of the fourth mounting channel to correspond to the tooth tops on both sides of the rack of the pile leg.

[0024] In one embodiment, the gap between the first guide assembly and the tooth tip of the piling leg rack is greater than the gap between the second guide assembly, the third guide assembly, the fourth guide assembly and the tooth tip of the piling leg rack.

[0025] Another object of the present invention is to provide an offshore platform, including a platform body and a plurality of legs, and a plurality of lifting systems as described in any of the preceding claims, wherein the plurality of lifting systems correspond one-to-one with the plurality of legs, and the lifting systems are used to drive the platform body to move up and down along the legs.

[0026] As can be seen from the above technical solution, the present invention has at least the following advantages and positive effects:

[0027] In this invention, the lifting system of the offshore platform includes a fixed pile frame, multiple lifting mechanisms, and a load-bearing mechanism. The multiple lifting mechanisms are installed on the fixed pile frame at intervals via the load-bearing mechanism, and the load of the gearbox in each lifting mechanism can be transmitted on the fixed pile frame through the load-bearing mechanism. Therefore, through the rational design of the load-bearing mechanism, the load on the gearboxes of each lifting mechanism can be balanced, allowing each gearbox to exert its maximum load-bearing capacity and improving the overall utilization rate of the lifting system.

[0028] Furthermore, by balancing the load on each gearbox, the problem of overloading a single gearbox can be avoided, thus preventing damage to the gearbox or pile leg structure and extending the service life of the lifting system and pile legs. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the lifting system of a marine platform according to an embodiment of the present invention.

[0030] Figure 2 for Figure 1 A schematic diagram of one of the lifting mechanisms in the structure shown.

[0031] Figure 3 for Figure 1 A schematic diagram of the structure as seen along the AA direction.

[0032] Figure 4 for Figure 1 A schematic diagram of the structure as seen along the BB direction.

[0033] Figure 5 This is a schematic diagram of the load distribution of a traditional lifting system.

[0034] Figure 6 This is a schematic diagram of the load distribution of the lifting system of an offshore platform according to an embodiment of the present invention.

[0035] The annotations in the attached figures are explained as follows:

[0036] 10 - Platform main body; 101 - Fourth installation channel;

[0037] 20-Pile leg; 201-Rack; 202-Main chord;

[0038] 30 - Lifting system;

[0039] 100 - Pile fixing frame; 110 - Support beam; 111 - Second installation channel; 120 - Top beam; 121 - Third installation channel;

[0040] 200 - Lifting mechanism; 210 - Frame; 211 - First mounting channel; 220 - Gearbox;

[0041] 300 - Load-bearing mechanism; 310 - First load-bearing section; 320 - Second load-bearing section;

[0042] 400 - Guiding mechanism;

[0043] 410 - First guide assembly; 411 - First guide section; 412 - First guide plate; 413 - Second guide plate; 414 - Third guide plate;

[0044] 420 - Second guide assembly; 421 - Second guide section; 430 - Third guide assembly; 431 - Third guide section; 440 - Fourth guide assembly; 441 - Fourth guide section. Detailed Implementation

[0045] Typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various variations in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations herein are for illustrative purposes only and not intended to limit the present invention.

[0046] In the description of this application, it should be understood that, in the embodiments shown in the accompanying drawings, the indications of direction or positional relationships (such as up, down, left, right, front, and back) are merely for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. These descriptions are appropriate when these elements are in the positions shown in the accompanying drawings. If the description of the positions of these elements changes, these directional indications also change accordingly.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0048] The lifting system for offshore platforms of the present invention aims to solve the problem of uneven load distribution among gearboxes in traditional lifting systems with multiple gearboxes. The lifting system of the present invention can achieve relatively balanced load distribution among the multiple gearboxes, improve the overall utilization rate of the lifting system, reduce the risk of overload in the bottom gearbox, and enhance system safety.

[0049] Please see Figure 1 and Figure 2 As shown, the lifting system 30 of the marine platform in this embodiment of the invention includes a fixed pile frame 100 and a plurality of lifting mechanisms 200, as well as a load-bearing mechanism 300 and a guiding mechanism 400.

[0050] The offshore platform may include a platform body 10. Taking a wind turbine installation vessel as an example, the platform body 10 may adopt a fully welded steel hull structure, and the hull structure may adopt a streamlined vertical bow and square stern form, depending on the specific circumstances.

[0051] For example, the platform body 10 may have four legs 20. Typically, the legs 20 are truss-type legs. Combined with... Figure 3As shown, a single pile leg 20 can have three or four main chord members 202. Each main chord member 202 is equipped with a rack 201.

[0052] like Figure 1 As shown, the pile fixing frame 100 is used to fix it to the platform body 10. For example, the platform body 10 may be provided with four pile fixing frames 100, and the four pile fixing frames 100 are arranged corresponding to the four pile legs 20. Among them, a single pile fixing frame 100 may include three or four main frame bodies. Each main frame body is used to correspond one-to-one with each main chord 202.

[0053] Therefore, the pile fixing frame 100 mentioned in this application should be understood as the main frame, and the pile legs 20 should be understood as the main chord members 202. For example, in this application, the multiple lifting mechanisms 200 installed on the pile fixing frame 100 refers to the multiple lifting mechanisms 200 installed on the main frame of the pile fixing frame 100. The multiple lifting mechanisms 200 are used to drive the racks 201 on the corresponding main chord members 202, thereby realizing the climbing and lowering of the platform body 10 along each pile leg 20.

[0054] like Figure 1 As shown, the pile fixing frame 100 is vertically fixed to the platform body 10. The bottom of the pile fixing frame 100 can be directly fixedly connected to the upper surface of the platform body 10. The top of the pile fixing frame 100 may be provided with a top beam 120. The top beam 120 and the platform body 10 may be provided with corresponding installation channels for the racks 201 of the pile legs 20 to pass through, which will be described in detail below.

[0055] See Figure 1 In this application, multiple lifting mechanisms 200 are installed at intervals along the length of the pile fixing frame 100. Support beams 110 may be provided on the pile fixing frame 100 corresponding to the intervals between two adjacent lifting mechanisms 200. That is, each support beam 110 can be inserted into the interval between two adjacent lifting mechanisms 200, thereby providing support and limiting the installation of each lifting mechanism 200.

[0056] Specifically, the lifting mechanism 200 includes a frame 210 and multiple gearboxes 220 installed within the frame 210. The frame 210 may be a steel frame structure, primarily used to support the gearboxes 220. Each gearbox 220 is driven to connect with the legs 20 to drive the platform body 10 to climb and descend along the legs 20.

[0057] In the embodiments of this application, two gearboxes 220 may be provided within the frame 210 of a single lifting mechanism 200. Each gearbox 220 may include two gearboxes 220, with the two gearboxes 220 of each layer located on both sides of the rack 201 to synchronously drive the rack 201 to move up and down.

[0058] For example, such as Figure 2 As shown, a single lifting mechanism 200 has four gearboxes 220 within its frame 210. The four gearboxes 220 are arranged in pairs, forming two layers. Thus, a single lifting mechanism 200 can be used to install multiple independent gearboxes, or to install a one-to-two gearbox system that is horizontally or vertically distributed.

[0059] In the embodiments of this application, a single lifting mechanism 200 includes two layers of gearboxes 220. However, this application is not limited to this. In other embodiments, a single lifting mechanism 200 may also be provided with three or four layers of gearboxes 220 as needed to improve the support capacity of the single lifting mechanism 200.

[0060] like Figure 1 and Figure 2 As shown, the load-bearing mechanism 300 is disposed between the frame 210 and the fixed pile frame 100. The frame 210 is installed between the fixed pile frame 100 and the support beam 110, or between two adjacent support beams 110, or between the support beam 110 and the platform body 10, through the load-bearing mechanism 300.

[0061] For example, the load-bearing mechanism 300 includes a first load-bearing portion 310, which is mounted on top of the frame 210. The first load-bearing portion 310 is intended to contact the lower surface of the top beam 120 or the lower surface of the support beam 110. Figure 1 As shown, for the lifting mechanism 200 located near the top of the fixed pile frame 100, the first load-bearing part 310 at the top of its frame 210 will contact the lower surface of the top beam 120.

[0062] For the lifting mechanism 200 located in the middle or at the bottom of the fixed pile frame 100, the first load-bearing part 310 at the top of its frame 210 will contact the lower surface of the corresponding support beam 110.

[0063] For example, such as Figure 2 As shown, each frame 210 may have two first load-bearing portions 310 at its top. The two first load-bearing portions 310 may be arranged symmetrically to ensure smooth contact between the frame 210 and the top beam 120 or support beam 110. It is understood that in other embodiments, the number of first load-bearing portions 310 may also be two or more.

[0064] In one embodiment, the first load-bearing part 310 can be an elastically deformable member. For example, the first load-bearing part 310 can be made of a metal disc spring or an elastic rubber. The first load-bearing part 310 can be formed into a cylindrical block structure. By setting the first load-bearing part 310 as an elastically deformable member, when the first load-bearing part 310 is stressed, it can deform to absorb the impact force, playing a buffering role, thereby effectively reducing the impact of the impact force on the lifting mechanism 200 and the pile fixing frame 100, and improving the impact resistance of the lifting system 30.

[0065] See Figure 1 , in one embodiment, along the length direction of the pile fixing frame 100, the stiffness of the first load-bearing parts 310 on each frame 210 decreases from top to bottom. Specifically, as <000015​​​​​​​​​​​​​As shown, for the lifting mechanism 200 located near the bottom of the fixed pile frame 100, the second load-bearing portion 320 at the bottom of its frame 210 may be in contact with the upper surface of the platform body 10. For the lifting mechanism 200 located in the middle or at the top of the fixed pile frame 100, the second load-bearing portion 320 at the bottom of its frame 210 will be in contact with the upper surface of the corresponding support beam 110.

[0069] In the embodiments of this application, the bottom of the pile fixing frame 100 is directly fixedly connected to the platform body 10. However, this application is not limited to this. In other embodiments, the bottom of the pile fixing frame 100 may be provided with a base, and the pile fixing frame 100 is fixedly connected to the platform body 10 through the base. Then, the second load-bearing part 320 at the bottom of the frame 210 of the lifting mechanism 200 provided near the bottom of the pile fixing frame 100 may be in contact with the upper surface of the base.

[0070] For example, such as Figure 2 As shown, each frame 210 can have two second load-bearing portions 320 at its bottom. The two second load-bearing portions 320 can be arranged symmetrically to ensure smooth contact between the frame 210 and the support beam 110 or the platform body 10. It is understood that in other embodiments, the number of second load-bearing portions 320 can also be two or more.

[0071] In one embodiment, the second load-bearing portion 320 can be an elastically deformable element. For example, the second load-bearing portion 320 can be made of a metal disc spring or elastic rubber. The second load-bearing portion 320 can be formed into a cylindrical block structure. By setting the second load-bearing portion 320 as an elastically deformable element, it can deform to absorb the impact force when subjected to force, thus playing a buffering role, thereby effectively reducing the impact force on the lifting mechanism 200 and the fixed pile frame 100, and improving the impact resistance of the lifting system 30.

[0072] In one embodiment, the stiffness of the second load-bearing portion 320 on each frame 210 is the same along the length of the pile fixing frame 100. Specifically, as shown in the figure... Figure 1 As shown, among the multiple lifting mechanisms 200 installed on the fixed pile frame 100, the stiffness of the second load-bearing part 320 on the lower lifting mechanism 200 can be equal to the stiffness of the second load-bearing part 320 on the upper lifting mechanism 200, i.e., K4 = K5 = K6. This is mainly because the second load-bearing parts 320 primarily bear the load of the pile legs 20 pressing on the platform body 10 in the floating state of the platform, while the load on the pile legs 20 is relatively small. Therefore, designing the second load-bearing parts 320 on each lifting mechanism 200 to have the same stiffness value does not affect the configuration of the gearbox 220.

[0073] In other embodiments, the stiffness of the second load-bearing portion 320 on each frame 210 can decrease from top to bottom, i.e., K4. <K5<K6。

[0074] In this embodiment, by designing the second load-bearing part 320 of each lifting mechanism 200, that is, by selecting the second load-bearing part 310 on each lifting mechanism 200, it is beneficial to ensure the load balance on the gearbox 220 of each lifting mechanism 200.

[0075] For example, the design and selection process for the second load-bearing part 320 of each lifting mechanism 200 can be as follows: While the offshore platform is floating, the load distribution of each leg 20 is analyzed using simulation software based on the weight of the legs 20 and the environmental loads on the hull. During the simulation analysis, the stiffness of the second load-bearing part 320 on each lifting mechanism 200 can be adjusted to achieve force balance among the lifting mechanisms 200, thereby determining the stiffness requirements of the second load-bearing part 320 on each lifting mechanism 200. The material of the second load-bearing part 320 is then selected, and the dimensions of the second load-bearing part 320 on each lifting mechanism 200 are designed according to the stiffness requirements. This completes the design of the second load-bearing part 320 on each lifting mechanism 200.

[0076] To facilitate the production and manufacturing of the lifting system 30, the second load-bearing part 320 on each lifting mechanism 200 can adopt the same design, thereby simplifying the design process and streamlining the manufacturing process.

[0077] It is understandable that different ship types have different requirements for the stiffness of the second load-bearing section 320. The second load-bearing section 320 can be made of materials such as metal disc springs and elastic rubber to meet different requirements, depending on the specific situation.

[0078] In the embodiments of this application, the multiple lifting mechanisms 200 are independent modules. Each lifting mechanism 200 is mounted on the fixed pile frame 100 via a first load-bearing part 310 and a second load-bearing part 320. By designing the rigidity of the first load-bearing part 310 and the second load-bearing part 320, the load of each gearbox 220 can be balanced, allowing each gearbox 220 to exert its maximum load-bearing capacity, thereby improving the overall utilization rate of the lifting system 30. Furthermore, after the load of each gearbox 220 is balanced, the problem of overload of a single gearbox 220 can be avoided, preventing damage to the gearbox 220 or the pile leg structure, thus helping to extend the service life of the lifting system 30 and the pile legs 20.

[0079] In the embodiments of this application, the guide mechanism 400 is used to guide the vertical movement of the pile leg 20. See also Figure 2As shown, in one embodiment, the guiding mechanism 400 includes a first guiding assembly 410 disposed on the frame 210. Specifically, the frame 210 is provided with a first mounting channel 211 for the rack 201 of the pile leg 20 to pass through. The first guiding assembly 410 includes two first guiding portions 411 disposed opposite each other, located on both sides of the first mounting channel 211, respectively corresponding to the two sides of the rack 201 of the pile leg 20. The number of first guiding assemblies 410 can be two sets. The two sets of first guiding assemblies 410 are respectively disposed at the top and bottom of the frame 210. Each first guiding assembly 410 includes two first guiding portions 411.

[0080] By setting two sets of first guide components 410 on the frame 210, and each first guide component 410 includes two first guide parts 411 respectively disposed on both sides of the first installation channel 211, the frame 210 can guide the up and down movement of the rack 201 of the pile leg 20, effectively limiting the movement path of the rack 201 of the pile leg 20 and ensuring the operational stability of the lifting system 30.

[0081] For example, such as Figure 3 As shown, the first guide section 411 includes a first guide plate 412, a second guide plate 413, and a third guide plate 414. The first guide plate 412 and the second guide plate 413 are respectively disposed within the first mounting channel 211 corresponding to the two surfaces of the rack 201 of the pile leg 20, and the third guide plate 414 is disposed within the first mounting channel 211 corresponding to the tooth tip of the rack 201 of the pile leg 20. In this embodiment, the horizontal movement between the lifting mechanism 200 and the rack 201 of the pile leg 20 is restricted by the first guide plate 412, the second guide plate 413, and the third guide plate 414, allowing only vertical movement between the lifting mechanism 200 and the rack 201 of the pile leg 20, thereby improving the smoothness and reliability of the lifting mechanism 200 driving the rack 201 to move up and down.

[0082] In one embodiment, the first guide plate 412, the second guide plate 413, and the third guide plate 414 are all detachably fixedly connected within the first mounting channel 211. By making the first guide plate 412, the second guide plate 413, and the third guide plate 414 detachable, it is convenient to replace each guide plate, facilitate the repair and maintenance of the guide structure within the lifting mechanism 200, and ensure the stable operation of the lifting system 30.

[0083] See Figure 1 In one embodiment of this application, the guiding mechanism 400 includes a second guiding component 420 and a third guiding component 430 disposed on the pile holder 100. For example... Figure 4As shown, the support beam 110 is provided with a second mounting channel 111 for the rack 201 of the pile leg 20 to pass through. The second guide assembly 420 includes two opposing second guide portions 421, which are respectively located on both sides of the second mounting channel 111 to correspond to the tooth tips on both sides of the rack 201 of the pile leg 20. The second guide portions 421 can be steel plates. Preferably, the steel plates are made of steel plates with good wear resistance and high rigidity.

[0084] In one embodiment, the gap between the first guide assembly 410 and the tooth tip of the rack 201 of the leg 20 is greater than the gap between the second guide assembly 420 and the tooth tip of the rack 201 of the leg 20. Specifically, the gap between the third guide plate 414 and the tooth tip of the rack 201 of the leg 20 can be 5mm-10mm. The gap between the second guide portion 421 and the tooth tip of the rack 201 of the leg 20 can be 3mm-5mm. This design ensures that the second guide assembly 420 can withstand the lateral load between the hull and the leg 20, preventing the first guide assembly 410 on the lifting mechanism 200 from bearing lateral loads, thereby effectively extending the service life of the lifting mechanism 200.

[0085] See Figure 1 In one embodiment, the top of the pile fixing frame 100 is provided with a third mounting channel 121 for the rack 201 of the pile leg 20 to pass through. Specifically, the third mounting channel 121 is disposed through the top beam 120. The third guide assembly 430 may include two opposing third guide portions 431, which are respectively disposed on both sides of the third mounting channel 121 to correspond to the tooth tops on both sides of the rack 201 of the pile leg 20. The third guide portion 431 may be a steel plate. Preferably, the steel plate is a steel plate with good wear resistance and high rigidity.

[0086] In one embodiment, the gap between the first guide assembly 410 and the tooth tip of the rack 201 of the leg 20 is greater than the gap between the third guide assembly 430 and the tooth tip of the rack 201 of the leg 20. Specifically, the gap between the third guide plate 414 and the tooth tip of the rack 201 of the leg 20 can be 5mm-10mm. The gap between the third guide portion 431 and the tooth tip of the rack 201 of the leg 20 can be 3mm-5mm. With this design, the third guide assembly 430 can withstand the lateral load between the hull and the leg 20, avoiding the first guide assembly 410 on the lifting mechanism 200 from bearing the lateral load, thereby effectively extending the service life of the lifting mechanism 200.

[0087] In other embodiments, when the bottom of the pile fixing frame 100 is provided with a base, the base may have a channel for the rack 201 of the pile leg 20 to pass through, and guide portions are provided on both sides of the channel corresponding to the tooth tips of the rack 201 of the pile leg 20. For example, the guide portion may be a wear-resistant steel plate. The gap between the guide portion and the tooth tip of the rack 201 of the pile leg 20 may be smaller than the gap between the third guide plate 414 and the tooth tip of the rack 201 of the pile leg 20.

[0088] See Figure 1 In one embodiment, the guiding mechanism 400 includes a fourth guiding component 440 disposed on the platform body 10. Specifically, the platform body 10 has a fourth mounting channel 101 for the passage of the rack 201 of the pile leg 20. The fourth guiding component 440 includes two opposing fourth guiding portions 441, which are respectively disposed on both sides of the fourth mounting channel 101 to correspond to the tooth tips on both sides of the rack 201 of the pile leg 20. For example, the fourth guiding portion 441 can be a steel plate. Preferably, the steel plate is a steel plate with good wear resistance and high rigidity.

[0089] In one embodiment, the gap between the first guide assembly 410 and the tooth tip of the rack 201 of the leg 20 is greater than the gap between the fourth guide assembly 440 and the tooth tip of the rack 201 of the leg 20. Specifically, the gap between the third guide plate 414 and the tooth tip of the rack 201 of the leg 20 can be 5mm-10mm. The gap between the fourth guide part 441 and the tooth tip of the rack 201 of the leg 20 can be 3mm-5mm. With this design, it can be ensured that the fourth guide assembly 440 can withstand the lateral load between the hull and the leg 20, avoiding the first guide assembly 410 on the lifting mechanism 200 from bearing the lateral load, thereby effectively extending the service life of the lifting mechanism 200.

[0090] In the embodiments of this application, by setting a guide mechanism 400, the vertical movement path of the rack 201 can be effectively guaranteed, thereby improving the stability and accuracy of the climbing and descending of the platform body 10.

[0091] See Figure 1 An embodiment of the present invention also provides an offshore platform, including a platform body 10 and a plurality of legs 20, as well as a plurality of lifting systems 30 as described in any of the preceding claims. Each of the plurality of lifting systems 30 corresponds one-to-one with a leg 20, and the lifting system 30 is used to drive the platform body 10 to move up and down along the legs 20. For example, an offshore platform typically has four legs 20, and one lifting system 30 can be installed on each leg 20. Therefore, the four lifting systems 30 can jointly drive the platform body 10 to move up and down along the legs 20.

[0092] See Figures 1 to 4As shown, the following will use a wind turbine installation vessel equipped with triangular truss legs and a six-layer gearbox as an example to illustrate the implementation of the present invention, as detailed below:

[0093] For the lifting system 30 with six gearboxes, each pair of gearboxes 220 can be configured as a lifting mechanism 200. Therefore, the lifting system 30 of this application has three lifting mechanisms 200, each lifting mechanism 200 including a frame 210 and four gearboxes 220. The climbing gears of each gearbox 220 of each lifting mechanism 200 are in contact with and mesh with the rack 201 of the pile leg 20.

[0094] Each lifting mechanism 200 has two first load-bearing parts 310 and two first guide parts 411 at the top of its frame 210. Each lifting mechanism 200 has two second load-bearing parts 320 and two first guide parts 411 at the bottom of its frame 210, as detailed below. Figure 2 As shown.

[0095] Three lifting mechanisms 200 are installed inside the pile fixing frame 100 in an upper, middle, and lower arrangement. The pile fixing frame 100 has a top beam 120 and two support beams 110, and its bottom is fixedly installed on the platform body 10. Specifically, the first load-bearing part 310 of the upper lifting mechanism 200 contacts the lower surface of the top beam 120 of the pile fixing frame 100, and its second load-bearing part 320 contacts the upper surface of the support beams 110 of the pile fixing frame 100. The first load-bearing part 310 of the middle lifting mechanism 200 contacts the lower surface of the support beams 110 of the pile fixing frame 100, and its second load-bearing part 320 contacts the upper surface of the support beams 110 of the pile fixing frame 100. The first load-bearing part 310 of the lower lifting mechanism 200 contacts the lower surface of the support beams 110 of the pile fixing frame 100, and its second load-bearing part 320 contacts the upper surface of the platform body 10.

[0096] A second guide assembly 420 is provided on the support beam 110 of the pile fixing frame 100. A third guide assembly 430 is provided on the top beam 120 of the pile fixing frame 100. A fourth guide assembly 440 is also provided on the platform body 10.

[0097] When the leg 20 stands and the hull is supported by the leg 20, the first load-bearing part 310 on the lifting mechanism 200 is in close contact with the top beam 120 and the support beam 110 of the pile fixing frame 100, and transmits the load of the hull pressing on the leg 20. By designing and selecting the first load-bearing part 310 on each lifting mechanism 200, for example, making the stiffness of the first load-bearing part 310 on the lower lifting mechanism 200 less than that of the first load-bearing part 310 on the upper lifting mechanism 200, that is, K1 < K2 < K3. In this way, by adjusting the stiffness of each first load-bearing part 310, the load supported by the leg 20 is balanced on each lifting mechanism 200, and further the load supported by each gearbox 220 is balanced.

[0098] When the hull floats and the leg 20 is supported by the hull, the second load-bearing part 320 on the lifting mechanism 200 is in close contact with the support beam 110 of the pile fixing frame 100 and the platform main body 10, and transmits the load of the leg 20 pressing on the hull. Design and select the second load-bearing part 320 on each lifting mechanism 200. Since the load of the leg 20 is small, designing the second load-bearing part 320 on each lifting mechanism 200 with the same stiffness value does not affect the configuration of the gearbox 220. Therefore, the second load-bearing part 320 on each lifting mechanism 200 can adopt the same design, that is, the same material and the same size, so that K4 = K5 = K6. This can not only be beneficial to balancing the load of each lifting mechanism 200, but also facilitate the production and manufacture of the lifting system 30.

[0099] As Figure 5 shown, when the support capacity of a single gearbox 220 is 575t, if the traditional fixed gear rack lifting system 30' is adopted, the bottom gearbox 220 is very easy to be overloaded, and the load imbalance value can reach 50%, that is, when the bottom gearbox 220 is fully loaded, the top gearbox 220 only outputs 50% of its capacity. Adopting the traditional lifting system 30', theoretically the support capacity of a single chord of the leg 20 is only about 4800 tons, which is far from the maximum support capacity of 6900 tons of a single chord. Therefore, the overall support capacity utilization rate of the traditional lifting system 30' is only 70%.

[0100] For the lifting system 30 of the present application, as can be seen from Figure 6 shown, the load difference between each layer of gearboxes 220 can be controlled within 10%. Theoretically, the support capacity of a single chord of the leg 20 can reach about 6500 tons, and the overall support capacity utilization rate of the lifting system 30 is close to 95%.

[0101] The lifting system 30 for an offshore platform of the present invention includes a fixed pile frame 100, multiple lifting mechanisms 200, and a load-bearing mechanism 300. The multiple lifting mechanisms 200 are installed on the fixed pile frame 100 at intervals via the load-bearing mechanism 300, and the load of the gearbox 220 in each lifting mechanism 200 can be transmitted on the fixed pile frame 100 through the load-bearing mechanism 300. Therefore, through the rational design of the load-bearing mechanism 300, the load on the gearbox 220 of each lifting mechanism 200 can be balanced, allowing each layer of gearbox 220 to exert its maximum load-bearing capacity and improving the overall utilization rate of the lifting system 30. Furthermore, after the load on each layer of gearbox 220 is balanced, the problem of overloading of a single gearbox 220 can be avoided, preventing damage to the gearbox 220 or the pile leg structure, thereby helping to extend the service life of the lifting system 30 and the pile legs 20.

[0102] The lifting system 30 of the marine platform of the present invention includes a load-bearing mechanism 300 comprising a first load-bearing part 310 and a second load-bearing part 320, both of which may be elastically deformable components. Due to the use of elastically deformable components, the first load-bearing part 310 and the second load-bearing part 320 can deform and absorb impact force when subjected to force, thereby effectively reducing the impact of impact force on the lifting mechanism 200 and the pile fixing frame 100, and improving the impact resistance of the lifting system 30.

[0103] The lifting system 30 of the marine platform of the present invention, by designing the rigidity of the first load-bearing part 310 and the second load-bearing part 320 on each lifting mechanism 200, can ensure the load balance of each gearbox 220, so that each gearbox 220 can exert its maximum load-bearing capacity and improve the overall utilization rate of the lifting system 30. At the same time, after the load of each gearbox 220 is balanced, the problem of overload of a single gearbox 220 can be avoided, and damage to the gearbox 220 or the pile leg structure can be avoided, thereby helping to extend the service life of the lifting system 30 and the service life of the pile leg 20.

[0104] The lifting system 30 of the marine platform of the present invention further includes a first guide assembly 410 disposed on the frame 210, a second guide assembly 420 and a third guide assembly 430 disposed on the fixed pile frame 100, and a fourth guide assembly 440 disposed on the platform body 10. Each guide assembly is used to guide the rack 201 of the pile leg 20, ensuring that the rack 201 of the pile leg 20 can only move vertically, thereby improving the stability and accuracy of the platform body 10 during climbing and descending.

[0105] Furthermore, by making the gap between the first guide component 410 and the tooth tip of the rack 201 of the pile leg 20 greater than the gap between the second guide component 420, the third guide component 430, the fourth guide component 440 and the tooth tip of the rack 201 of the pile leg 20, it can be ensured that the guide structure on the fixed pile frame 100 and the platform body 10 bears the lateral load between the platform and the pile leg 20, avoiding the first guide component 410 on the lifting mechanism 200 from bearing the lateral load, thereby effectively extending the service life of each lifting mechanism 200.

[0106] The marine platform of the present invention has all the above-mentioned beneficial effects because it includes the lifting system 30 described in any of the above embodiments, which will not be repeated here.

[0107] The above embodiments are merely illustrative examples of structures. The structures in each embodiment are not fixed combinations. In the absence of structural conflicts, the structures in multiple embodiments can be arbitrarily combined and used.

[0108] Although the invention has been described with reference to several typical embodiments, it should be understood that the terminology used is illustrative and exemplary, and not restrictive. Since the invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A riser system for an offshore platform, characterized by, The utility model relates to a pile fixing frame for fixing on a platform body of a sea platform, a plurality of lifting mechanisms, a plurality of lifting mechanisms are installed on the pile fixing frame along the length direction of the pile fixing frame, the lifting mechanism includes a frame and a plurality of gearboxes installed in the frame, each gearbox is used to drive connection with the pile leg of a sea platform to drive the platform body to climb and descend along the pile leg, and a bearing mechanism is arranged between the frame and the pile fixing frame. The frame is installed between the pile fixing frame and the supporting beam through the bearing mechanism, or installed between two adjacent supporting beams, or installed between the supporting beam and the platform body. The bearing mechanism includes a first bearing part installed on the top of the frame, and the rigidity of the first bearing part on each frame decreases from top to bottom along the length direction of the pile fixing frame. The bearing mechanism further includes a second bearing part installed on the bottom of the frame, and the rigidity of the second bearing part on each frame is the same or decreases from top to bottom along the length direction of the pile fixing frame. The top of the pile fixing frame is provided with a top end beam, and the first bearing part is used to contact the lower surface of the top end beam or the lower surface of the supporting beam. The second bearing part is used to contact the upper surface of the supporting beam or the upper surface of the platform body. The first bearing part is an elastic deformation part; and / or The second bearing part is an elastic deformation part.

2. The riser system of a platform as defined in claim 1, wherein Further comprising a guide mechanism, the guide mechanism includes a first guide assembly arranged on the frame, a second guide assembly and a third guide assembly arranged on the pile fixing frame, and a fourth guide assembly arranged on the platform body, and the guide mechanism is used to guide the up and down movement of the pile leg.

3. The riser system of a platform as defined in claim 2, wherein, The frame is provided with a first installation channel for the rack of the pile leg to pass through, and the first guide assembly includes two oppositely arranged first guide parts, and the two first guide parts are arranged on both sides of the first installation channel to correspond to both sides of the rack of the pile leg respectively.

4. The riser system of a platform as defined in claim 3, wherein, The first guide part includes a first guide plate, a second guide plate and a third guide plate, the first guide plate and the second guide plate are arranged in the first installation channel corresponding to both surfaces of the rack of the pile leg respectively, and the third guide plate is arranged in the first installation channel corresponding to the tooth top of the rack of the pile leg. The first guide plate, the second guide plate and the third guide plate are detachably fixedly connected in the first installation channel.

5. The riser system of a platform according to any one of claims 1 to 4, characterized in that, The supporting beam is provided with a second installation channel for the rack of the pile leg to pass through, and the second guide assembly includes two oppositely arranged second guide parts, and the two second guide parts are arranged on both sides of the second installation channel to correspond to both tooth tops of the rack of the pile leg respectively.

6. The riser system of a platform as defined in claim 5, wherein, ​ 7. The riser system of a platform as defined in claim 6, wherein, ​ 8. The riser system of a platform as defined in claim 7, wherein, ​ 9. The riser system of a platform as defined in claim 5, wherein, ​ 10. The riser system of a platform as defined in claim 5, wherein, The top of the pile frame is provided with a third installation channel for the rack of the pile leg to pass through, and the third guide assembly comprises two oppositely arranged third guide portions arranged on both sides of the third installation channel to correspond to both side teeth of the rack of the pile leg.

11. The riser system of a platform as defined in claim 5, wherein, The platform body is provided with a fourth installation channel for the rack of the pile leg to pass through, and the fourth guide assembly comprises two oppositely arranged fourth guide portions arranged on both sides of the fourth installation channel to correspond to both side teeth of the rack of the pile leg.

12. The riser system of a platform as defined in claim 5, wherein, The gap between the first guide assembly and the tooth top of the rack of the pile leg is greater than the gap between the second guide assembly, the third guide assembly, the fourth guide assembly and the tooth top of the rack of the pile leg.

13. An offshore platform, characterized by The platform body and the plurality of pile legs, and a plurality of lifting systems according to any one of claims 1-12, wherein the plurality of lifting systems correspond to the plurality of pile legs one by one, and the lifting systems are used to drive the platform body to move up and down along the pile legs.

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