Self-elevating offshore platform and installation method thereof

Abstract

The invention relates to the technical field, in particular to a self-elevating offshore platform and an installation method thereof.The self-elevating offshore platform comprises a jacket foundation composed of a jacket body and steel pipe piles, submarine cable conduits, a berthing device composed of berthing piles, a berthing part and a crawling ladder, and an upper module composed of pile legs, a main platform and a lifting driving assembly; a via hole is formed in the position, close to the bottom end, of the periphery of the pile leg, a wire passing channel allowing a submarine cable to penetrate out of the top end is formed in the pile leg, and the via hole communicates with the wire passing channel. The submarine cable guide pipe is fixedly connected to the outer side of the steel pipe pile, and a top opening of the submarine cable guide pipe corresponds to the via hole. Autonomous installation of the offshore platform can be achieved, the submarine cable extends to the upper portion from the lower portion of the upper module, and the berthing and logging-in requirements of an offshore booster station or a converter station can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore platforms, and in particular to a self-elevating offshore platform and an installation method thereof. Background Art

[0002] Wind energy is a clean, renewable, green energy with high development efficiency and good economic performance. It has large-scale development conditions and commercial prospects. Countries around the world are vigorously building wind farms, and wind power generation technology has also developed rapidly. For converter stations or booster station platforms, their weight is getting heavier and heavier. The use of large floating cranes to hoist the upper modules is gradually becoming unfeasible due to price and lifting capacity issues. At present, the floating method is commonly used in offshore engineering to install converter stations or booster station platforms, but its installation risk is relatively high and has high requirements for sea conditions.

[0003] At present, a new installation method is to use a self-elevating converter station or booster station, and use the self-elevating installation equipment on it to adjust the lifting of the pile legs, and complete the installation process such as positioning and fixing at sea by itself, which can avoid large floating cranes and corresponding floating installation methods. However, the problem caused by this is that the boarding device and the submarine cable pipe cannot be arranged on the conductor frame and extend from the upper module to the seabed like a conventional conductor frame, that is, there is no installation space for the J-shaped pipe, and the boarding device cannot be set on the pile legs. Therefore, it is necessary to explore new boarding devices and submarine cable pipe layout methods suitable for this kind of self-elevating converter station or booster station to meet the relevant needs such as personnel boarding and laying of submarine cables. Summary of the invention

[0004] The purpose of the present application is to provide a self-elevating offshore platform and an installation method, which can provide an up and down channel for a submarine cable and meet the requirements for docking and landing of an offshore booster station or converter station.

[0005] To achieve the above-mentioned purpose, the present application adopts a self-elevating offshore platform, comprising: a conductor frame foundation, a submarine cable conductor, a mooring device and an upper assembly;

[0006] The jacket foundation comprises a jacket body and a steel pipe pile, wherein the steel pipe pile is fixedly connected to the jacket body, the bottom end of the steel pipe pile is used to be fixedly connected to the seabed foundation, and the top end is penetrated through the top surface of the jacket body;

[0007] The upper block comprises: pile legs, a main platform and a lifting drive assembly, the bottom of the pile legs is fixedly connected to the top of the steel pipe pile, the main platform is located above the jacket body, and the lifting drive assembly connects the pile legs and the main platform, the lifting drive assembly can drive the main platform to move up and down relative to the pile legs, a through hole is provided at a position near the bottom end of the outer periphery of the pile legs, and a wire passage for the submarine cable to pass through from the top is provided inside the pile legs, and the through hole is communicated with the wire passage;

[0008] The submarine cable conduit is fixedly connected to the outer side of the steel pipe pile, and the top opening of the submarine cable conduit corresponds to the through hole;

[0009] The mooring device comprises: a mooring pile, a berthing part and a ladder, wherein the mooring pile is fixedly connected to the jacket body, the berthing part is fixedly arranged on the outer periphery of the mooring pile near the bottom end, and the ladder is fixedly arranged on the outer peripheral wall of the mooring pile, and the ladder is located above the berthing part.

[0010] As a preferred technical solution, the mooring portion includes: a cage and a pair of anti-collision columns, the cage is mounted on the outer periphery of the mooring pile, and the cage is fixedly connected to the mooring pile, a pair of the anti-collision columns are arranged in parallel and at intervals on the outer periphery of the cage, the anti-collision columns at least partially protrude from the sea surface, the pair of the anti-collision columns and the outer peripheral wall of the cage together define a mooring area, and the ladder is located above the mooring area.

[0011] As a preferred technical solution, the mooring device further comprises a sleeve, the sleeve is fixedly connected to the conductor frame body, the mooring pile is sleeved in the sleeve, and the mooring pile is fixedly connected to the sleeve.

[0012] As a preferred technical solution, a traction device is provided on the inner side of the top of the pile leg, and the traction device is used to pull the submarine cable from the through hole to the top of the pile leg.

[0013] As a preferred technical solution, the traction device is a winch.

[0014] As a preferred technical solution, a guide plate is further provided. The guide plate is arranged on the outer side of the pile leg close to the through hole, and the guide plate is used to guide the submarine cable into the through hole.

[0015] As a preferred technical solution, a truss walkway is further provided, one end of which is rotatably connected to the main platform, and the other end of which is connected to the mooring pile.

[0016] The present application also provides a method for installing a self-elevating offshore platform, comprising:

[0017] Install the conductor frame foundation and submarine cable conductor,

[0018] The jacket foundation includes a jacket body and steel pipe piles, the steel pipe piles are fixedly connected to the jacket body, the bottom ends of the steel pipe piles are fixedly connected to the seabed foundation, and the submarine cable is fixedly connected to the outer side of the steel pipe piles;

[0019] Install mooring device,

[0020] The mooring device comprises: a mooring pile, a berthing part and a ladder. The mooring pile is fixedly installed on the outer side of the jacket body, the berthing part is installed at a position near the bottom end of the outer periphery of the mooring pile, and the ladder is arranged on the outer peripheral wall of the mooring pile so that the ladder is located above the berthing part.

[0021] Assemble the upper block,

[0022] The upper block comprises: pile legs, a main platform and a lifting drive assembly, wherein the main platform is connected to the pile legs through the lifting drive assembly, a through hole is provided at a position near the bottom end of the outer periphery of the pile legs, a cable passage is provided inside the pile legs for the submarine cable to pass through from the top end, and the through hole is communicated with the cable passage;

[0023] Start the lowering drive assembly to make the main platform flush with the bottom of the pile leg, tow the upper assembly to the foundation of the conductor frame with a tugboat, align the bottom of the pile leg with the top of the steel pipe pile, start the lowering drive assembly to raise the main platform to the working height, so that the pile leg is inserted into the steel pipe pile, and the side of the main platform is connected to the mooring pile, grouting is performed through the through hole to achieve a fixed connection between the pile leg and the steel pipe pile, the submarine cable is passed through the submarine cable pipe and enters the interior of the pile leg through the through hole, the submarine cable is pulled from the line passage to the top of the pile leg by a traction device, and then the submarine cable is connected to the cable layer on the main platform.

[0024] As a preferred technical solution, it also includes providing a truss walkway, which is provided on a side of the main platform close to the mooring pile, one end of the truss walkway is rotatably connected to the main platform, and the other end is connected to the mooring pile.

[0025] Compared with the prior art, the self-elevating offshore platform in this application has the following beneficial effects:

[0026] 1. When installing the self-elevating offshore platform, the lifting drive assembly can be used to move the main platform up and down relative to the pile legs; when it moves to the working position, the lifting drive assembly is used to lock the main platform so that the relative position of the pile legs and the main platform is fixed, ensuring that the main platform is stably maintained at the set height of the pile legs. Compared with the traditional floating crane method of installing the offshore platform, this application can more accurately and conveniently insert the pile legs into the steel pipe piles, and facilitate the adjustment of the working height of the main platform;

[0027] 2. A through hole is provided on the outer periphery of the pile leg, and a wire passage is provided inside the pile leg for the submarine cable to pass through from the top thereof, and the through hole is connected with the wire passage. The submarine cable passes through the submarine cable pipe and enters the wire passage through the through hole, and passes through the top of the pile leg, thereby entering the cable layer on the main platform for power transmission and communication transmission, so that the submarine cable can be extended from the lower part to the upper part of the self-elevating offshore platform, effectively reducing the laying length of the submarine cable pipe, and the submarine cable is located inside the pile leg, which can reduce the impact of waves on the submarine cable and protect the submarine cable;

[0028] 3. Mooring piles are arranged on the outside of the jacket body, and mooring parts are arranged on the periphery of the mooring piles. A ladder is arranged on the periphery of the mooring piles. The ladder is located above the mooring part. The main platform is raised and lowered by the lifting drive assembly to realize the connection between the mooring piles and the main platform. When the ship is docked at the mooring part, personnel can climb up the ladder to the mooring piles and then board the main platform, meeting the requirements for docking and boarding of offshore booster stations or converter stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present application is further described in detail below in conjunction with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be used as a limitation on the scope of the present application. In addition, unless otherwise specified, the drawings are intended only to conceptually represent the composition or structure of the described objects and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0030] Figure 1 It is a structural schematic diagram of the self-installation platform of the present invention;

[0031] Figure 2 is a schematic diagram of an upper assembly of the present invention;

[0032] Figure 3 is a cross-sectional view of a pile leg of the present invention;

[0033] Figure 4 It is a schematic diagram of the mooring device of the present invention;

[0034] Among them: 1. Pipe frame foundation; 11. Pipe frame body; 12. Steel pipe piles; 2. Submarine cable pipe; 3. Mooring device; 31. Mooring piles; 32. Berthing part; 321. Cage; 322. Anti-collision column; 33. Ladder; 34. Sleeve; 4. Upper assembly; 41. Pile leg; 411. Through hole; 412. Guide plate; 413. Cable passage; 42. Main platform; 43. Lifting drive assembly; 5. Truss walkway. DETAILED DESCRIPTION

[0035] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0036] In the description of the present application, it should be understood that the terms "front", "rear", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, in the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0037] See also Figure 1-4 , a self-elevating offshore platform provided in an embodiment of the present application, comprising: a conductor frame foundation 1, a submarine cable conductor 2, a mooring device 3 and an upper assembly 4;

[0038] The jacket foundation 1 includes a jacket body 11 and a steel pipe pile 12, wherein the steel pipe pile 12 is fixedly connected to the jacket body 11, the bottom end of the steel pipe pile 12 is used to be fixedly connected to the seabed foundation, and the top end is penetrated through the top surface of the jacket body 11;

[0039] The upper assembly block 4 includes: a pile leg 41, a main platform 42 and a lifting drive assembly 43. The bottom of the pile leg 41 is fixedly connected to the top of the steel pipe pile 12. The main platform 42 is located above the jacket body 11. The lifting drive assembly 43 connects the pile leg 41 and the main platform 42. The lifting drive assembly 43 can drive the main platform 42 to move up and down relative to the pile leg 41. A through hole 411 is provided at a position near the bottom end of the outer periphery of the pile leg 41, and a wire passage 413 for the submarine cable to pass through from the top is provided inside the pile leg 41. The through hole 411 is communicated with the wire passage 413.

[0040] The submarine cable conduit 2 is fixedly connected to the outer side of the steel pipe pile 12, and the top opening of the submarine cable conduit 2 is arranged corresponding to the through hole 411;

[0041] The mooring device 3 includes: a mooring pile 31, a mooring portion 32 and a ladder 33. The mooring pile 31 is fixedly connected to the jacket body 11, the mooring portion 32 is fixedly arranged on the outer periphery of the mooring pile 31 near the bottom end, and the ladder 33 is fixedly arranged on the outer peripheral wall of the mooring pile 31, and the ladder 33 is located above the mooring portion 32.

[0042] In this embodiment, firstly, the driving lifting drive assembly 43 can lift the main platform 42 to the working position, and the height of the main platform 42 can be adjusted according to the actual situation; secondly, a wire passage 413 is provided inside the pile leg 41, and a through hole 411 is provided at a position near the bottom of the outer side of the pile leg 41, so that the top opening of the submarine cable duct 2 corresponds to the through hole 411, thereby realizing the lifting of the submarine cable from the bottom to the top of the self-elevating offshore platform. Compared with the traditional method of setting a J-shaped tube, the present application can effectively save the laying time of the submarine cable duct 2. The length of the pile leg 41 is set, and the surrounding wall of the pile leg 41 can protect the submarine cable to prevent the submarine cable from being hit and corroded by waves; in addition, a mooring pile 31 is set on one side of the conductor frame body 11, and the height of the main platform 42 is adjusted so that the main platform 42 is connected to the mooring pile 31. A mooring portion 32 is provided at the bottom of the mooring pile 31 near the sea surface for mooring operation and maintenance vessels. A ladder 33 is provided above the mooring portion 32. Personnel can climb up to the top of the mooring pile 31 via the ladder 33, and go up to the main platform 42 to work, thereby meeting the requirements for docking and boarding of offshore booster stations or converter stations.

[0043] It is worth noting that in the present application, the ladder 33 is a segmented ladder 33, and platforms are provided between the multiple segments of the ladder 33, which can be used as a resting place or as a working platform for installing and repairing the ladder 33 itself and surrounding equipment, and as a transfer climbing work surface.

[0044] Furthermore, the mooring portion 32 includes: a cage 321 and a pair of anti-collision columns 322, wherein the cage 321 is sleeved on the outer periphery of the mooring pile 31, and the cage 321 is fixedly connected to the mooring pile 31, a pair of the anti-collision columns 322 are arranged in parallel and spaced apart on the outer periphery of the cage 321, and the anti-collision columns 322 at least partially protrude from the sea surface, and a pair of the anti-collision columns 322 and the outer peripheral wall of the cage 321 jointly define a mooring area, and the ladder 33 is located above the mooring area. The tires on the side of the maintenance vessel can be stuck in the mooring area to fix the maintenance vessel and facilitate the docking of personnel. The cage 321 also provides further protection for the safety of personnel.

[0045] Furthermore, the mooring device 3 further includes a sleeve 34, the sleeve 34 is fixedly connected to the jacket body 11, the mooring pile 31 is sleeved in the sleeve 34, and the mooring pile 31 is fixedly connected to the sleeve 34. The sleeve 34 and the jacket body 11, the sleeve 34 and the mooring pile 31 are connected by welding, so that the connection between the two is more reliable, further increasing the safety of the self-elevating offshore platform.

[0046] Furthermore, a traction device is provided on the inner side of the top of the pile leg 41, and the traction device is used to pull the submarine cable from the first through hole to the top of the pile leg 41. In this embodiment, the traction device preferably adopts a winch, and the steel wire cable of the winch is passed through the wire passage 413, and then the diver ties the submarine cable traction head to the steel wire cable, turns on the winch, and drags the submarine cable through the wire passage 413 to the top of the pile leg 41, and then pulls the submarine cable to the cable layer inside the main platform 42.

[0047] Furthermore, a guide plate 412 is provided, and the guide plate 412 is arranged at a position outside the pile leg 41 close to the through hole 411, and the guide plate 412 is used to guide the submarine cable into the through hole 411. The guide plate 412 can assist in traction when the winch is traction of the submarine cable, thereby improving traction efficiency.

[0048] Furthermore, a truss walkway 5 is provided, one end of which is rotatably connected to the main platform 42, and the other end is connected to the mooring pile 31. When the main platform 42 is separated from the mooring pile 31 by a distance, the other end of the truss walkway 5 can be rotated to the mooring pile 31 and welded to the mooring pile 31 to achieve the connection between the main platform 42 and the mooring pile 31, so that personnel can board the main platform 42 to work conveniently.

[0049] The present application also provides a method for installing a self-elevating offshore platform, comprising:

[0050] Install the conductor frame foundation 1 and the submarine cable conductor 2,

[0051] The jacket foundation 1 includes a jacket body 11 and a steel pipe pile 12, wherein the steel pipe pile 12 is fixedly connected to the jacket body 11, and the bottom end of the steel pipe pile 12 is fixedly connected to the seabed foundation, and the submarine cable is fixedly connected to the outer side of the steel pipe pile 12;

[0052] Install mooring device 3,

[0053] The mooring device 3 includes: a mooring pile 31, a mooring portion 32 and a ladder 33. The mooring pile 31 is fixedly installed on the outer side of the jacket body 11, the mooring portion 32 is installed at a position near the bottom of the outer periphery of the mooring pile 31, and the ladder 33 is arranged on the outer peripheral wall of the mooring pile 31, so that the ladder 33 is located above the mooring portion 32;

[0054] Assemble the upper block 4,

[0055] The upper assembly 4 comprises: a pile leg 41, a main platform 42 and a lifting drive assembly 43, wherein the main platform 42 is connected to the pile leg 41 through the lifting drive assembly 43, a through hole 411 is provided at a position near the bottom end of the outer periphery of the pile leg 41, a wire passage 413 for the submarine cable to pass through from the top end is provided inside the pile leg 41, and the through hole 411 is communicated with the wire passage 413;

[0056] The lowering drive assembly is started to make the main platform 42 flush with the bottom of the pile leg 41, the upper assembly block 4 is towed to the jacket foundation 1 by a tugboat, the bottom of the pile leg 41 is aligned with the top of the steel pipe pile 12, the lowering drive assembly is started to raise the main platform 42 to the working height, so that the pile leg 41 is inserted into the steel pipe pile 12, and the side of the main platform 42 is connected to the berthing pile 31, grouting is performed through the through hole 411 to achieve a fixed connection between the pile leg 41 and the steel pipe pile 12, the submarine cable is passed through the submarine cable pipe, and enters the inside of the pile leg 41 through the through hole 411, the submarine cable is pulled from the line channel 413 to the top of the pile leg 41 by a traction device, and then the submarine cable is connected to the cable layer on the main platform 42.

[0057] In this embodiment, the self-elevating offshore platform installed by this installation method can facilitate the lifting and lowering of the main platform 42, the submarine cable can be lifted from the bottom of the pile leg 41 to the top, the operation and maintenance vessel can be stably docked, and personnel can board the main platform 42 to perform operations, that is, it can realize the extension of the submarine cable from the lower part to the upper part of the self-elevating offshore platform and meet the requirements for docking and boarding of the offshore booster station or converter station.

[0058] Furthermore, a truss walkway 5 is provided, and the truss walkway 5 is provided on a side of the main platform 42 close to the mooring pile 31, and one end of the truss walkway 5 is rotatably connected to the main platform 42, and the other end is connected to the mooring pile 31. The provision of the truss walkway 5 can further facilitate the connection between the main platform 42 and the mooring pile 31, and the truss walkway 5 can rotate around one end connected to the main platform 42, and when it is no longer necessary to be connected to the mooring pile 31, the other end can be rotated to the main platform 42 to prevent it from being damaged by long-term wind and waves.

[0059] In summary, the self-elevating offshore platform provided in this embodiment adopts a lifting drive assembly 43 to realize the up and down movement of the main platform 42 relative to the pile legs 41, and by opening holes in the pile legs 41 and setting the wire passage 413, it is possible to provide an up and down channel for the submarine cable, so that the submarine cable can be extended from the lower part to the upper part of the self-elevating offshore platform; at the same time, a berthing device 3 is provided to realize the berthing of ships and the boarding of personnel on the main platform 42, thereby meeting the berthing and boarding requirements of the offshore booster station or converter station.

[0060] This specification discloses the present application with reference to the accompanying drawings, and also enables those skilled in the art to implement the present application, including making and using any device or system, using suitable materials, and using any combined method. The scope of the present application is defined by the technical solution for protection, and includes other examples that occur to those skilled in the art. As long as such other examples include structural elements that are not different from the literal language of the technical solution for protection, or such other examples contain equivalent structural elements that are not substantially different from the literal language of the technical solution for protection, such other examples should be considered to be within the scope of protection determined by the technical solution for protection of the present application.

Claims

1. A self-elevating offshore platform, characterized in that: include: The jacket foundation, cable duct, mooring device and topside module; The jacket foundation comprises a jacket body and a steel pipe pile, wherein the steel pipe pile is fixedly connected to the jacket body, the bottom end of the steel pipe pile is used to be fixedly connected to the seabed foundation, and the top end is penetrated through the top surface of the jacket body; The upper block comprises: pile legs, a main platform and a lifting drive assembly, the bottom of the pile legs is fixedly connected to the top of the steel pipe pile, the main platform is located above the jacket body, and the lifting drive assembly connects the pile legs and the main platform, the lifting drive assembly can drive the main platform to move up and down relative to the pile legs, a through hole is provided at a position near the bottom end of the outer periphery of the pile legs, and a wire passage for the submarine cable to pass through from the top is provided inside the pile legs, and the through hole is communicated with the wire passage; The submarine cable conduit is fixedly connected to the outer side of the steel pipe pile, and the top opening of the submarine cable conduit corresponds to the through hole; The mooring device comprises: a mooring pile, a berthing part and a ladder, wherein the mooring pile is fixedly connected to the jacket body, the berthing part is fixedly arranged on the outer periphery of the mooring pile near the bottom end, and the ladder is fixedly arranged on the outer peripheral wall of the mooring pile, and the ladder is located above the berthing part.

2. The self-elevating offshore platform according to claim 1, characterized in that: The mooring portion includes: a cage and a pair of anti-collision columns, the cage is mounted on the outer periphery of the mooring pile, and the cage is fixedly connected to the mooring pile, the pair of anti-collision columns are arranged in parallel and at intervals on the outer periphery of the cage, the anti-collision columns at least partially protrude from the sea surface, the pair of anti-collision columns and the outer peripheral wall of the cage together define a mooring area, and the ladder is located above the mooring area.

3. The self-elevating offshore platform according to claim 2, characterized in that: The mooring device further comprises a sleeve, the sleeve is fixedly connected to the conductor frame body, the mooring pile is sleeved in the sleeve, and the mooring pile is fixedly connected to the sleeve.

4. The self-elevating offshore platform according to claim 1, characterized in that: A traction device is provided on the inner side of the top of the pile leg, and the traction device is used to pull the submarine cable from the through hole to the top of the pile leg.

5. The self-elevating offshore platform according to claim 4, characterized in that: The traction device is a winch.

6. The self-elevating offshore platform according to claim 5, characterized in that: A guide plate is also provided, which is arranged on the outside of the pile leg near the through hole, and is used to guide the submarine cable into the through hole.

7. The self-elevating offshore platform according to claim 1, characterized in that: A truss walkway is also provided, one end of which is rotatably connected to the main platform, and the other end of which is connected to the mooring pile.

8. A method for installing a self-elevating offshore platform, characterized in that: include: Install the conductor frame foundation and submarine cable conductor, The jacket foundation includes a jacket body and steel pipe piles, the steel pipe piles are fixedly connected to the jacket body, the bottom ends of the steel pipe piles are fixedly connected to the seabed foundation, and the submarine cable is fixedly connected to the outer side of the steel pipe piles; Install mooring device, The mooring device comprises: a mooring pile, a berthing part and a ladder. The mooring pile is fixedly installed on the outer side of the jacket body, the berthing part is installed at a position near the bottom end of the outer periphery of the mooring pile, and the ladder is arranged on the outer peripheral wall of the mooring pile so that the ladder is located above the berthing part. Assemble the upper block, The upper block comprises: pile legs, a main platform and a lifting drive assembly, wherein the main platform is connected to the pile legs through the lifting drive assembly, a through hole is provided at a position near the bottom end of the outer periphery of the pile legs, a cable passage is provided inside the pile legs for the submarine cable to pass through from the top end, and the through hole is communicated with the cable passage; Start the lowering drive assembly to make the main platform flush with the bottom of the pile leg, tow the upper assembly to the foundation of the conductor frame with a tugboat, align the bottom of the pile leg with the top of the steel pipe pile, start the lowering drive assembly to raise the main platform to the working height, so that the pile leg is inserted into the steel pipe pile, and the side of the main platform is connected to the mooring pile, grouting is performed through the through hole to achieve a fixed connection between the pile leg and the steel pipe pile, the submarine cable is passed through the submarine cable pipe and enters the interior of the pile leg through the through hole, the submarine cable is pulled from the line passage to the top of the pile leg by a traction device, and then the submarine cable is connected to the cable layer on the main platform.

9. The method for installing a self-elevating offshore platform according to claim 8, characterized in that: It also includes a truss walkway, which is arranged on a side of the main platform close to the mooring pile, one end of the truss walkway is rotatably connected to the main platform, and the other end is connected to the mooring pile.

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