Lifting system of ocean platform and ocean platform

Abstract

The invention relates to a lifting system of an ocean platform and the ocean platform. The lifting system of the ocean platform comprises a pile fixing frame, a plurality of lifting mechanisms and a force bearing mechanism. The pile fixing frame is used for being fixed to a platform body of the ocean platform. The multiple lifting mechanisms are installed on the pile fixing frame at intervals in the length direction of the pile fixing frame, each lifting mechanism comprises a frame and multiple gear boxes installed in the frame, and the gear boxes are used for being in driving connection with pile legs of the ocean platform so as to drive the platform body to climb and descend along the pile legs. The force bearing mechanism is arranged between the frame and the pile fixing frame. Supporting beams are arranged at the positions, corresponding to the interval between every two adjacent lifting mechanisms, of the pile fixing frame, and the frame is installed between the pile fixing frame and the supporting beams through a force bearing mechanism or installed between every two adjacent supporting beams or installed between the supporting beams and the platform body. According to the lifting system of the ocean platform, the load of the gear box of each lifting mechanism can be balanced, so that the overall utilization rate of the lifting system is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of marine platforms, and in particular to a marine platform lifting system and a marine platform. Background Art

[0002] With the rapid development of marine engineering, the size and weight of self-elevating platforms using truss pile legs and gear racks are getting larger and larger, and the environmental conditions they can withstand are becoming more and more severe. Therefore, the load of the hull on a single pile leg is also increasing, from several thousand tons to tens of thousands of tons. The load between the hull and the pile leg is transmitted through the gearbox. The support capacity of a single gearbox is generally 350-700 tons. The greater the load on a single pile leg, the more gearboxes are required. The number of gearbox layers of a self-elevating drilling platform is generally 3-4 layers, while the number of gearbox layers of large self-elevating wind power installation vessels has increased to 6-8 layers in order to achieve large loading and pile-circling crane large lifting capabilities.

[0003] In traditional technology, one end of the gearbox is fixed on the pile frame, and the other end is connected to the pile leg through a climbing gear, thereby playing the role of lifting and supporting locking. During the design of the wind power installation ship, it was found that as the number of gearbox layers increases, the support loads borne by each layer of gearboxes become more unbalanced. The support load of the lower gearbox is extremely large, even exceeding the design allowable value, while the support load of the upper gearbox is relatively small, so the overall utilization rate of the lifting system is not high. For example Figure 5 As shown in the figure, for a wind turbine installation vessel with triangular truss pile legs and 6 layers of gearboxes, the support capacity of a single gearbox is 575t. With the traditional fixed gear rack lifting system, the bottom gearbox is easily overloaded, and the load imbalance value can reach 50%, that is, when the bottom gearbox is fully loaded, the top gearbox only outputs 50% of its capacity. In theory, the support capacity of a single chord of the pile leg is only about 4,800 tons, which is far from the maximum support capacity of a single chord of 6,900 tons. The overall support capacity utilization rate of the lifting system is only 70%. Summary of the invention

[0004] One purpose of the present invention is to solve the problems existing in the prior art such as uneven load support of each gearbox in the multi-layer gearbox lifting system, and to provide a lifting system for an offshore platform. To solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A lifting system for an offshore platform, comprising:

[0006] A pile fixing frame, which is used to be fixed on the platform body of the offshore platform;

[0007] A plurality of lifting mechanisms, wherein the plurality of lifting mechanisms are installed on the pile frame at intervals along the length direction of the pile frame, the lifting mechanisms comprising a frame and a plurality of gear boxes installed in the frame, each gear box being used for driving connection with a pile leg of the offshore platform to drive the platform body to climb and descend along the pile leg; and

[0008] A load-bearing mechanism, which is arranged between the frame and the pile fixing frame;

[0009] A supporting beam is provided on the pile frame corresponding to the interval between two adjacent lifting mechanisms, and the frame is installed between the pile frame and the supporting beam through a load-bearing mechanism, or between two adjacent supporting beams, or between the supporting beam and the platform body.

[0010] In one of the embodiments, the load-bearing mechanism includes a first load-bearing portion, and the first load-bearing portion is installed on the top of the frame;

[0011] A top beam is arranged on the top of the pile fixing frame, and the first load-bearing part is used to contact with the lower surface of the top beam or the lower surface of the supporting beam.

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

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

[0014] In one embodiment, along the length direction 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 portion is an elastic deformation member; and / or

[0016] The second load-bearing part is an elastic deformation part.

[0017] In one embodiment, the lifting system of the offshore platform also includes a guide mechanism, which includes a first guide assembly arranged on the frame, a second guide assembly and a third guide assembly arranged on the pile 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 legs.

[0018] In one embodiment, 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 first guide parts arranged opposite to each other, and the two first guide parts are arranged on both sides of the first installation 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 arranged in the first installation channel corresponding to the two surfaces of the rack of the pile leg, and the third guide plate is arranged in the first installation channel corresponding to the tooth top of the rack of the pile leg.

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

[0021] In one of the embodiments, 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 second guide portions arranged opposite to each other, and the two second guide portions are arranged on both sides of the second installation channel to respectively correspond to the tooth top arrangements on both sides of the rack of the pile leg.

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

[0023] In one embodiment, 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 includes two fourth guide parts arranged opposite to each other, and the two fourth guide parts are arranged on both sides of the fourth installation channel to respectively correspond to the tooth top arrangements on both sides of the rack of the pile leg.

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

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

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

[0027] In the present invention, the lifting system of the offshore platform includes a pile frame and a plurality of lifting mechanisms, and a load-bearing mechanism. The plurality of lifting mechanisms are installed on the pile frame at intervals through the load-bearing mechanism, and the load of the gearbox in each lifting mechanism can be transmitted on the pile frame through the load-bearing mechanism. Therefore, through the reasonable design of the load-bearing mechanism, the load of the gearbox of each lifting mechanism can be balanced, so that each layer of gearbox can exert its maximum load-bearing capacity, thereby improving the overall utilization rate of the lifting system.

[0028] Moreover, after the loads of the gear boxes at each layer are balanced, the problem of overloading of a single gear box can be avoided, and damage to the gear box or pile leg structure can be avoided, which is beneficial to extending the service life of the lifting system and the pile legs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic structural diagram of a lifting system of an offshore platform according to one embodiment of the present invention.

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

[0031] Figure 3 for Figure 1 Schematic diagram of the structure viewed along direction AA in the shown structure.

[0032] Figure 4 for Figure 1 Schematic diagram of the structure viewed along direction BB in the shown structure.

[0033] Figure 5 Schematic diagram of load distribution of traditional lifting system.

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

[0035] The following are the descriptions of the reference numerals:

[0036] 10- platform body; 101- fourth installation channel;

[0037] 20- pile leg; 201- rack; 202- main chord;

[0038] 30-lifting system;

[0039] 100-pile fixing frame; 110-supporting beam; 111-second installation channel; 120-top beam; 121-third installation channel;

[0040] 200-lifting mechanism; 210-frame; 211-first installation channel; 220-gear box;

[0041] 300- load-bearing mechanism; 310- first load-bearing part; 320- second load-bearing part;

[0042] 400-Guide mechanism;

[0043] 410-first guide assembly; 411-first guide portion; 412-first guide plate; 413-second guide plate; 414-third guide plate;

[0044] 420 - second guide assembly; 421 - second guide portion; 430 - third guide assembly; 431 - third guide portion; 440 - fourth guide assembly; 441 - fourth guide portion. DETAILED DESCRIPTION

[0045] Typical embodiments that embody 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 changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustration purposes rather than for limiting the present invention.

[0046] In the description of the present application, it should be understood that in the embodiments shown in the drawings, the indications of directions or positional relationships (such as up, down, left, right, front and back, etc.) are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, the indications of these directions also change accordingly.

[0047] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0048] The offshore platform lifting system of the present invention aims to solve the problem of uneven loads on gear boxes at each layer in a conventional lifting system equipped with multiple layers of gear boxes. The offshore platform lifting system of the present invention can achieve relative balance of loads on multiple layers of gear boxes, improve the overall utilization of the lifting system, reduce the risk of overload of the bottom gear box, and improve system safety.

[0049] See also Figure 1 and Figure 2 As shown, the lifting system 30 of the offshore platform according to the embodiment of the present invention comprises a pile fixing 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 the offshore platform as a wind power installation ship 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, which may be determined according to the specific situation.

[0051] For example, the platform body 10 may be provided with four pile legs 20. Usually, the pile legs 20 are truss-type pile legs 20. Figure 3As shown, a single pile leg 20 may have three or four main chords 202. A rack 201 is provided on each main chord 202.

[0052] like Figure 1 As shown, the pile fixing frame 100 is used to be fixed on the platform body 10. For example, four pile fixing frames 100 may be provided on the platform body 10, 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 frames. Each main frame is used to be arranged in a one-to-one correspondence with each main chord 202.

[0053] Based on this, the pile 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 202. For example, in this application, multiple lifting mechanisms 200 installed on the pile frame 100 refer to multiple lifting mechanisms 200 installed on the main frame of the pile frame 100. The multiple lifting mechanisms 200 are used to drive and connect with the racks 201 on the corresponding main chord 202, so as to achieve the climbing and descending of the platform body 10 along each pile leg 20.

[0054] like Figure 1 As shown, the pile fixing frame 100 is vertically fixed on 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. A top beam 120 can be provided on the top of the pile fixing frame 100. Among them, the top beam 120 and the platform body 10 can be correspondingly provided with installation channels for the rack 201 of the pile leg 20 to pass through, which will be described in detail below.

[0055] See also Figure 1 In the present application, a plurality of lifting mechanisms 200 are installed on the pile fixing frame 100 at intervals along the length direction of the pile fixing frame 100. Among them, a support beam 110 may be provided on the pile fixing frame 100 corresponding to the interval between two adjacent lifting mechanisms 200. That is, each support beam 110 may be inserted into the interval between two adjacent lifting mechanisms 200, thereby playing the role of supporting and limiting the installation of each lifting mechanism 200.

[0056] Specifically, the lifting mechanism 200 includes a frame 210 and a plurality of gear boxes 220 installed in the frame 210. The frame 210 may be a steel frame structure, which is mainly used to support and set the gear boxes 220. Each gear box 220 is used to drive and connect with the pile legs 20 to drive the platform body 10 to climb and descend along the pile legs 20.

[0057] In the embodiment of the present application, two layers of gear boxes 220 may be provided in the frame 210 of a single lifting mechanism 200. Each layer of gear boxes 220 may include two gear boxes 220, and the two gear boxes 220 of each layer are respectively located on both sides of the rack 201 to synchronously drive the rack 201 to move up and down.

[0058] For example, Figure 2 As shown, a total of four gear boxes 220 are arranged in the frame 210 of a single lifting mechanism 200. The four gear boxes 220 are grouped in pairs to form a layer, and are distributed up and down to form two layers in total. In this way, a single lifting mechanism 200 can be used to install multiple independent gear boxes, and can also be used to install horizontally or vertically distributed one-to-two gear boxes.

[0059] In the embodiment of the present application, a single lifting mechanism 200 includes two layers of gear boxes 220. However, the present application is not limited thereto, and in other embodiments, a single lifting mechanism 200 may also be provided with three or four layers of gear boxes 220 according to requirements 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 pile fixing frame 100. The frame 210 is installed between the pile fixing frame 100 and the supporting beam 110, or between two adjacent supporting beams 110, or between the supporting 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 installed on the top of the frame 210. The first load-bearing portion 310 is used to contact the lower surface of the top beam 120 or the lower surface of the supporting beam 110. Figure 1 As shown, for the lifting mechanism 200 disposed near the top of the pile fixing frame 100 , the first load-bearing portion 310 at the top of the frame 210 will contact the lower surface of the top beam 120 .

[0062] For the lifting mechanism 200 disposed in the middle section or at the bottom of the pile fixing frame 100 , the first load-bearing portion 310 at the top of the frame 210 will contact the lower surface of the corresponding supporting beam 110 .

[0063] For example, Figure 2 As shown, the number of the first load-bearing parts 310 disposed on the top of each frame 210 can be two. The two first load-bearing parts 310 can be symmetrically arranged so that the frame 210 can be in stable contact with the top beam 120 or the support beam 110. It can be understood that in other embodiments, the number of the first load-bearing parts 310 can also be two or more.

[0064] In one embodiment, the first load-bearing portion 310 may be an elastically deformable member. For example, the first load-bearing portion 310 may be made of a metal disc spring or an elastic rubber. The first load-bearing portion 310 may be formed into a cylindrical block structure. By setting the first load-bearing portion 310 as an elastically deformable member, when the first load-bearing portion 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 portions 310 on each frame 210 decreases from top to bottom. Specifically, as Figure 1 shown, among the multiple lifting mechanisms 200 installed on the pile fixing frame 100, the stiffness of the first load-bearing portion 310 on the lower lifting mechanism 200 is less than the stiffness of the first load-bearing portion 310 on the upper lifting mechanism 200, that is, K1 < K2 < K3. Since the main load borne by each first load-bearing portion 310 is the load of the platform main body 10 pressing on the pile leg 20 in the platform standing state, by designing the stiffness of the first load-bearing portions 310 of each lifting mechanism 200, that is, selecting the type of the first load-bearing portions 310 on each lifting mechanism 200, it is beneficial to ensure the load balance on the gearbox 220 of each lifting mechanism 200.

[0066] Exemplarily, the design and selection process of the first load-bearing portions 310 of each lifting mechanism 200 may be as follows: In the standing state of the offshore platform, according to the hull weight and the environmental loads received by the hull, etc., use simulation software to analyze the load distribution of each pile leg 20. During the analysis using the simulation software, the stiffness of the first load-bearing portions 310 on each lifting mechanism 200 can be adjusted to achieve the force balance of each lifting mechanism 200, so as to obtain the stiffness requirements of the first load-bearing portions 310 on each lifting mechanism 200. Select the material of the first load-bearing portion 310 and design the size of the first load-bearing portion 310 on each lifting mechanism 200 according to the stiffness requirements. That is, the design of the first load-bearing portions 310 on each lifting mechanism 200 is completed.

[0067] It can be understood that different ship types have different stiffness requirements for the first load-bearing portion 310. The first load-bearing portion 310 can select materials such as metal disc springs and elastic rubbers to meet different requirements, which can be determined according to the specific situation.

[0068] See Figure 2 , in one embodiment, the load-bearing mechanism 300 further includes a second load-bearing portion 320. The second load-bearing portion 320 is installed at the bottom of the frame 210, and the second load-bearing portion 320 is used to contact the upper surface of the support beam 110 or the upper surface of the platform main body 10. As Figure 1As shown, for the lifting mechanism 200 disposed near the bottom of the pile fixing frame 100, the second load-bearing portion 320 at the bottom of the frame 210 may be in contact with the upper surface of the platform body 10. For the lifting mechanism 200 disposed in the middle or top of the pile fixing frame 100, the second load-bearing portion 320 at the bottom of the frame 210 will be in contact with the upper surface of the corresponding supporting beam 110.

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

[0070] For example, Figure 2 As shown, the number of the second load-bearing parts 320 provided at the bottom of each frame 210 may be two. The two second load-bearing parts 320 may be symmetrically arranged so that the frame 210 can be in stable contact with the support beam 110 or the platform body 10. It is understood that in other embodiments, the number of the second load-bearing parts 320 may also be two or more.

[0071] In one embodiment, the second load-bearing part 320 can be an elastic deformation part. For example, the second load-bearing part 320 can be made of a metal disc spring or elastic rubber. The second load-bearing part 320 can be formed into a cylindrical block structure. By setting the second load-bearing part 320 as an elastic deformation part, when the second load-bearing part 320 is subjected to force, it can deform to absorb the impact force and play 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.

[0072] In one embodiment, along the length direction of the pile fixing frame 100, the second load bearing parts 320 on each frame 210 have the same rigidity. Figure 1 As shown, among the multiple lifting mechanisms 200 installed on the pile fixing frame 100, the stiffness of the second load-bearing part 320 on the lifting mechanism 200 located at the bottom can be equal to the stiffness of the second load-bearing part 320 on the lifting mechanism 200 located at the top, that is, K4=K5=K6. This is mainly because each second load-bearing part 320 mainly carries the load of the pile legs 20 pressing on the platform body 10 when the platform is floating, and the load of the pile legs 20 is relatively small. Therefore, the second load-bearing part 320 on each lifting mechanism 200 is designed to have the same stiffness value and does not affect the configuration of the gear box 220.

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

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

[0075] For example, the design and selection process of the second load-bearing part 320 of each lifting mechanism 200 can be: in the floating state of the marine platform, according to the weight of the pile leg 20 and the environmental load on the hull, etc., the load distribution of each pile leg 20 is analyzed using simulation software. In the process of using the simulation software for analysis, the stiffness of the second load-bearing part 320 on each lifting mechanism 200 can be adjusted to achieve balanced force on each lifting mechanism 200, so that the stiffness requirement of the second load-bearing part 320 on each lifting mechanism 200 can be obtained. The material of the second load-bearing part 320 is selected, and the size of the second load-bearing part 320 on each lifting mechanism 200 is designed according to the stiffness requirement. That is, the design of the second load-bearing part 320 on each lifting mechanism 200 is completed.

[0076] In order to facilitate the production of the lifting system 30, the second load-bearing part 320 on each lifting mechanism 200 can adopt the same design, so as to simplify the design process and streamline the manufacturing process.

[0077] It can be understood that different ship types have different stiffness requirements for the second load-bearing part 320. The second load-bearing part 320 can use metal disc springs, elastic rubber and other materials to meet different requirements, depending on the specific situation.

[0078] In the embodiment of the present application, the multiple lifting mechanisms 200 are independent modules, and each lifting mechanism 200 is installed on the pile fixing frame 100 through the first load-bearing part 310 and the 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 balance of each layer of gear boxes 220 can be achieved, so that each layer of gear boxes 220 can exert its maximum load-bearing capacity, thereby improving the overall utilization rate of the lifting system 30. In addition, after the load balance of each layer of gear boxes 220, the problem of overloading of a single gear box 220 can be avoided, and the damage of the gear box 220 or the pile leg structure can be avoided, which is conducive to extending the service life of the lifting system 30 and the pile leg 20.

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

[0080] By arranging two groups of first guide assemblies 410 on the frame 210, and each first guide assembly 410 includes two first guide parts 411 respectively arranged 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 operation stability of the lifting system 30.

[0081] For example, Figure 3 As shown, the first guide portion 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 arranged in the first installation channel 211 corresponding to the two surfaces of the rack 201 of the pile leg 20, and the third guide plate 414 is arranged in the first installation channel 211 corresponding to the tooth top 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 limited by the first guide plate 412, the second guide plate 413 and the third guide plate 414, and only the vertical movement between the lifting mechanism 200 and the rack 201 of the pile leg 20 is allowed, thereby improving the stability 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 in the first installation channel 211. By setting the first guide plate 412, the second guide plate 413 and the third guide plate 414 as a detachable structure, it is convenient to replace each guide plate, facilitate the repair and maintenance of the guide structure in the lifting mechanism 200, and ensure the stable operation of the lifting system 30.

[0083] See also Figure 1 In one embodiment of the present application, the guide mechanism 400 includes a second guide assembly 420 and a third guide assembly 430 disposed on the pile fixing frame 100. Figure 4As shown, the support beam 110 is provided with a second installation channel 111 for the rack 201 of the pile leg 20 to pass through, and the second guide assembly 420 includes two second guide parts 421 arranged opposite to each other, and the two second guide parts 421 are arranged on both sides of the second installation channel 111 to correspond to the tooth tops on both sides of the rack 201 of the pile leg 20. Among them, the second guide part 421 can be a steel plate. The steel plate is preferably a steel plate with good wear resistance and high rigidity.

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

[0085] See also Figure 1 In one embodiment, the top of the pile fixing frame 100 is provided with a third installation channel 121 for the rack 201 of the pile leg 20 to pass through. Specifically, the third installation channel 121 is set through the top beam 120. The third guide assembly 430 may include two third guide parts 431 arranged opposite to each other, and the two third guide parts 431 are arranged on both sides of the third installation channel 121 to correspond to the tooth tops on both sides of the rack 201 of the pile leg 20. Among them, the third guide part 431 can be a steel plate. The steel plate is preferably 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 top of the rack 201 of the leg 20 is greater than the gap between the third guide assembly 430 and the tooth top of the rack 201 of the leg 20. Specifically, the gap between the third guide plate 414 and the tooth top of the rack 201 of the leg 20 can be 5mm-10mm. The gap between the third guide portion 431 and the tooth top of the rack 201 of the leg 20 can be 3mm-5mm. Through such a design, it can be ensured that the third guide assembly 430 can withstand the lateral load between the hull and the leg 20, and the first guide assembly 410 on the lifting mechanism 200 is prevented from bearing the lateral load, thereby effectively extending the service life of the lifting mechanism 200.

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

[0088] See also Figure 1 In one embodiment, the guide mechanism 400 includes a fourth guide assembly 440 disposed on the platform body 10. Specifically, the platform body 10 is provided with a fourth installation channel 101 for the rack 201 of the pile leg 20 to pass through. The fourth guide assembly 440 includes two fourth guide portions 441 disposed opposite to each other, and the two fourth guide portions 441 are disposed on both sides of the fourth installation channel 101 to correspond to the tooth tops on both sides of the rack 201 of the pile leg 20. For example, the fourth guide portion 441 can be a steel plate. The steel plate is preferably 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 top of the rack 201 of the leg 20 is greater than the gap between the fourth guide assembly 440 and the tooth top of the rack 201 of the leg 20. Specifically, the gap between the third guide plate 414 and the tooth top of the rack 201 of the leg 20 can be 5mm-10mm. The gap between the fourth guide portion 441 and the tooth top of the rack 201 of the leg 20 can be 3mm-5mm. Through such a design, it can be ensured that the fourth guide assembly 440 can withstand the lateral load between the hull and the leg 20, and the first guide assembly 410 on the lifting mechanism 200 is prevented from bearing the lateral load, thereby effectively extending the service life of the lifting mechanism 200.

[0090] In the embodiment of the present application, by providing the guide mechanism 400 , the up and down movement path of the rack 201 can be effectively guaranteed, and the climbing and descending stability and accuracy of the platform body 10 can be improved.

[0091] See also Figure 1 One embodiment of the present invention further provides an offshore platform, comprising a platform body 10 and a plurality of pile legs 20, and a plurality of lifting systems 30 as described above. The plurality of lifting systems 30 correspond to the plurality of pile legs 20 one by one, and the lifting systems 30 are used to drive the platform body 10 to move up and down along the pile legs 20. For example, an offshore platform is usually provided with four pile legs 20, and a lifting system 30 can be correspondingly installed on each pile leg 20. Therefore, the four lifting systems 30 can jointly drive the platform body 10 to move up and down along the pile legs 20.

[0092] See also Figures 1 to 4As shown, the following will take a wind power installation vessel equipped with a triangular truss pile leg and a six-layer gearbox as an example to illustrate the implementation of the present invention, as follows:

[0093] For the lifting system 30 with six layers of gear boxes, every two layers of gear boxes 220 can be set as one lifting mechanism 200. Therefore, the lifting system 30 of the present application has three lifting mechanisms 200, each of which includes a frame 210 and four gear boxes 220. The climbing gears of each gear box 220 of each lifting mechanism 200 are in contact and mesh with the rack 201 of the pile leg 20.

[0094] The top of the frame 210 of each lifting mechanism 200 is provided with two first load-bearing parts 310 and two first guide parts 411. The bottom of the frame 210 of each lifting mechanism 200 is provided with two second load-bearing parts 320 and two first guide parts 411. Figure 2 shown.

[0095] The three lifting mechanisms 200 are installed inside the pile frame 100 in the upper, middle and lower arrangement. The pile frame 100 is provided with a top beam 120 and two supporting beams 110, and the bottom of the pile frame 100 is fixedly installed on the platform body 10. Among them, the first load-bearing part 310 of the upper lifting mechanism 200 contacts the lower surface of the top beam 120 of the pile frame 100, and the second load-bearing part 320 contacts the upper surface of the supporting beam 110 of the pile frame 100. The first load-bearing part 310 of the middle lifting mechanism 200 contacts the lower surface of the supporting beam 110 of the pile frame 100, and the second load-bearing part 320 contacts the upper surface of the supporting beam 110 of the pile frame 100. The first load-bearing part 310 of the lower lifting mechanism 200 contacts the lower surface of the supporting beam 110 of the pile frame 100, and the second load-bearing part 320 contacts the upper surface of the platform body 10.

[0096] The second guide assembly 420 is disposed on the supporting beam 110 of the pile fixing frame 100. The third guide assembly 430 is disposed on the top beam 120 of the pile fixing frame 100. The fourth guide assembly 440 is also disposed 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. By designing and selecting 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. Thus, it is not only beneficial to balance the load of each lifting mechanism 200, but also convenient for the production and manufacturing 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 topmost 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 of each layer of gearbox 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 of the offshore platform of the present invention comprises a pile frame 100, a plurality of lifting mechanisms 200, and a load-bearing mechanism 300. The plurality of lifting mechanisms 200 are installed on the pile frame 100 at intervals through the load-bearing mechanism 300, and the load of the gearbox 220 in each lifting mechanism 200 can be transmitted on the pile frame 100 through the load-bearing mechanism 300. Therefore, through the reasonable design of the load-bearing mechanism 300, the load of the gearbox 220 of each lifting mechanism 200 can be balanced, so that each layer of gearbox 220 can exert its maximum load-bearing capacity, thereby improving the overall utilization rate of the lifting system 30. In addition, after the load of each layer of gearbox 220 is balanced, the problem of overloading of a single gearbox 220 can be avoided, and the damage of the gearbox 220 or the pile leg structure can be avoided, which is conducive to extending the service life of the lifting system 30 and the pile leg 20.

[0102] In the lifting system 30 of the offshore platform of the present invention, the load-bearing mechanism 300 includes a first load-bearing part 310 and a second load-bearing part 320, and both the first load-bearing part 310 and the second load-bearing part 320 can adopt elastic deformation parts. Due to the use of elastic deformation parts, the first load-bearing part 310 and the second load-bearing part 320 can deform to absorb the impact force when subjected to force, 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.

[0103] The lifting system 30 of the offshore platform of the present invention can ensure the load balance of each layer of gear boxes 220 by designing the stiffness of the first load-bearing part 310 and the second load-bearing part 320 on each lifting mechanism 200, so that each layer of gear boxes 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 layer of gear boxes 220 is balanced, the problem of overloading of a single gear box 220 can be avoided, and the damage of the gear box 220 or the pile leg structure can be avoided, which is conducive to extending the service life of the lifting system 30 and extending the service life of the pile leg 20.

[0104] The lifting system 30 of the offshore 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 pile fixing 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, respectively, to ensure that the rack 201 of the pile leg 20 can only move up and down in the vertical direction, thereby improving the stability and accuracy of the climbing and descending of the platform body 10.

[0105] Furthermore, by making the gap between the first guide assembly 410 and the tooth top of the rack 201 of the pile leg 20 larger than the gap between the second guide assembly 420, the third guide assembly 430, the fourth guide assembly 440 and the tooth top of the rack 201 of the pile leg 20, it is ensured that the lateral load between the platform and the pile leg 20 is borne by the guide structure on the pile fixing frame 100 and the platform body 10, and the first guide assembly 410 on the lifting mechanism 200 is prevented from bearing the lateral load, thereby effectively extending the service life of each lifting mechanism 200.

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

[0107] The above embodiments are merely exemplary descriptions of the structures. The structures in the embodiments are not fixed combination structures. In the absence of structural conflicts, the structures in multiple embodiments can be used in any combination.

[0108] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in a variety of 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, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A lifting system for an offshore platform, characterized in that: include: A pile fixing frame, which is used to be fixed on the platform body of the offshore platform; A plurality of lifting mechanisms, wherein the plurality of lifting mechanisms are installed on the pile frame at intervals along the length direction of the pile frame, the lifting mechanism comprises a frame and a plurality of gear boxes installed in the frame, each of the gear boxes being used for driving connection with a pile leg of the offshore platform to drive the platform body to climb and descend along the pile leg; as well as A load-bearing mechanism, the load-bearing mechanism being arranged between the frame and the pile fixing frame; A supporting beam is provided on the pile fixing frame corresponding to the interval between two adjacent lifting mechanisms, and the frame is installed between the pile fixing frame and the supporting beam through the load-bearing mechanism, or between two adjacent supporting beams, or between the supporting beam and the platform body.

2. The offshore platform lifting system according to claim 1, characterized in that: The load-bearing mechanism comprises a first load-bearing portion, and the first load-bearing portion is installed on the top of the frame; A top beam is provided on the top of the pile fixing frame, and the first load-bearing portion is used to contact the lower surface of the top beam or the lower surface of the supporting beam.

3. The offshore platform lifting system according to claim 2, characterized in that: Along the length direction of the pile fixing frame, the rigidity of the first load-bearing part on each of the frames decreases from top to bottom.

4. The offshore platform lifting system according to claim 2, characterized in that: The load-bearing mechanism further includes a second load-bearing portion, 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.

5. The offshore platform lifting system according to claim 4, characterized in that: Along the length direction of the pile fixing frame, the rigidity of the second load-bearing part on each of the frames is the same or decreases from top to bottom.

6. The offshore platform lifting system according to claim 4, characterized in that: The first load-bearing part is an elastic deformation part; and / or The second load-bearing portion is an elastic deformation member.

7. The offshore platform lifting system according to any one of claims 1 to 6, characterized in that: It also includes a guide mechanism, which includes a first guide component arranged on the frame, a second guide component and a third guide component arranged on the pile fixing frame, and a fourth guide component arranged on the platform body. The guide mechanism is used to guide the up and down movement of the pile legs.

8. The offshore platform lifting system according to claim 7, characterized in that: 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 first guide parts arranged opposite to each other, and the two first guide parts are arranged on both sides of the first installation channel to correspond to the two sides of the rack of the pile leg respectively.

9. The offshore platform lifting system according to claim 8, characterized in that: 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 arranged in the first installation channel corresponding to two surfaces of the rack of the pile leg, and the third guide plate is arranged in the first installation channel corresponding to the tooth top of the rack of the pile leg.

10. The offshore platform lifting system according to claim 9, characterized in that: The first guide plate, the second guide plate and the third guide plate are all detachably fixedly connected in the first installation channel.

11. The offshore platform lifting system according to claim 7, characterized in that: The support 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 second guide parts arranged opposite to each other, and the two second guide parts are arranged on both sides of the second installation channel to correspond to the tooth tops on both sides of the rack of the pile leg respectively.

12. The offshore platform lifting system according to claim 7, characterized in that: A third installation channel for the rack of the pile leg to pass through is provided on the top of the pile fixing frame, and the third guide assembly includes two third guide parts arranged opposite to each other, and the two third guide parts are arranged on both sides of the third installation channel to correspond to the tooth tops on both sides of the rack of the pile leg respectively.

13. The offshore platform lifting system according to claim 7, characterized in that: 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 includes two fourth guide parts arranged opposite to each other, and the two fourth guide parts are arranged on both sides of the fourth installation channel to respectively correspond to the tooth tops on both sides of the rack of the pile leg.

14. The offshore platform lifting system according to claim 7, characterized in that: The gap between the first guide assembly and the tooth top of the leg rack is greater than the gap between the second guide assembly, the third guide assembly, the fourth guide assembly and the tooth top of the leg rack.

15. An offshore platform, characterized in that: It comprises a platform body and a plurality of pile legs, and a plurality of lifting systems as described in any one of claims 1 to 14, wherein the plurality of lifting systems correspond one-to-one to the plurality of pile legs, and the lifting systems are used to drive the platform body to move up and down along the pile legs.

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