Erosion protection of submarine cable structures and method of construction thereof

Abstract

The application belongs to the technical field of offshore wind power, and discloses a scour-resistant submarine cable structure and a construction method thereof, wherein the scour-resistant submarine cable structure comprises a submarine cable body and a protection assembly; the protection assembly comprises a connecting seat, the connecting seat is fixedly connected with the submarine cable body, protection sleeves are arranged on the two sides of the connecting seat, bionic grass is laid on the protection sleeves, water-absorbing expansion components are arranged at the ends of the protection sleeves away from the connecting seat, the protection sleeves on the two sides wrap the submarine cable body from the two sides of the submarine cable body respectively, and the two water-absorbing expansion components are fixedly connected through water-soluble hydrolysis glue. The submarine cable body is connected with the scour-resistant component to form an integrated body, the laying of the submarine cable can be easily realized, the scour-resistant problem of the submarine cable is solved, the construction cost is low, the operation is simple, and the installation operation of the scour-resistant component does not need divers to dive into the seabed, so that the operation safety is high.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power, and in particular to an anti-scour submarine cable structure and a construction method thereof. Background Art

[0002] Submarine cables (hereinafter referred to as "submarine cables") are mainly used to transmit electricity generated by offshore wind turbines. After the submarine cables are laid, they are laid and operated in the marine environment, facing many complex challenges. For example, after the submarine cables are laid, they will hinder the progress of waves and currents, causing the surrounding flow field to change. The shear stress on the seabed surface around the submarine cables increases sharply, driving the sediment on the seabed surface to leave the seabed and move downstream with the water flow. Under long-term action, scour pits will form around the submarine cables, causing the submarine cables to be partially suspended, making the submarine cables vulnerable to damage or damage, affecting the stability of the submarine cable performance.

[0003] To address the issue of submarine cables being easily scoured during installation, bionic grass scour prevention technology is currently commonly used. However, the traditional bionic grass scour prevention method is cumbersome to install and requires the use of an offshore crane for offshore operations. Divers are also required to dive to the seabed to anchor the bionic grass to the seabed, resulting in high installation costs and high risks for operators. Summary of the Invention

[0004] The purpose of the present invention is to provide an anti-scouring submarine cable structure and a construction method thereof, which connects the submarine cable body and the anti-scouring components to form an integral whole, can easily realize the laying of the submarine cable, and solve the anti-scouring problem of the submarine cable at the same time. The construction cost is low and the operation is simple. There is no need for divers to dive to the seabed to install the anti-scouring components, and the operation is highly safe.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] On the one hand, an anti-scour submarine cable structure is provided, comprising a submarine cable body and a protective component, wherein the protective component comprises a connecting seat, which is fixedly connected to the submarine cable body, protective sleeves are provided on both sides of the connecting seat, and the protective sleeves are covered with bionic grass. A water-absorbing and expanding component is provided at one end of the protective sleeve away from the connecting seat, and the protective sleeves on both sides respectively wrap the submarine cable body from both sides of the submarine cable body, and the two water-absorbing and expanding components are fixed by bonding with water-soluble hydrolytic glue.

[0007] In one embodiment, the submarine cable body includes a core, the outside of which is wrapped with an insulation layer, a shielding layer and a protective layer in sequence, and the protective layer is fixedly connected to the connecting seat.

[0008] In one embodiment, a card slot is provided on the protective layer, and a card protrusion that engages with the card slot is provided on the connecting seat.

[0009] In one of the embodiments, the length direction of the connecting seat, the protective sleeve and the water-absorbing expansion component extends along the axial direction of the submarine cable body.

[0010] In one of the embodiments, the protective sleeve and the water-absorbing expansion component on both sides are symmetrically arranged along the radial mid-axis of the submarine cable body.

[0011] In one of the embodiments, the bionic grass is arranged in a matrix on the protective sleeve, the length direction of the matrix is parallel to the axial direction of the submarine cable body, and the width direction of the matrix is parallel to the radial direction of the submarine cable body.

[0012] In one of the embodiments, the water-absorbing expansion component comprises an elastic hydrophilic non-woven fabric sleeve, and a containing cavity is arranged in the hydrophilic non-woven fabric sleeve, and the containing cavity is filled with a water-absorbing expansion agent.

[0013] In one of the embodiments, the connecting seat is provided with a locking member, the locking member comprises a locking belt, the locking belt comprises a first locking belt and a second locking belt which are respectively fixed at both ends of the connecting seat, the first locking belt and the second locking belt are respectively arranged on both sides of the submarine cable body in the radial direction, the first locking belt and the second locking belt respectively wrap the submarine cable body from both sides of the submarine cable body, one end of the first locking belt away from the connecting seat is provided with a lock buckle, one end of the second locking belt away from the connecting seat is provided with a locking part, and the locking part is in locking connection with the lock buckle.

[0014] In one of the embodiments, the protective sleeve is provided with an elastic member on the side facing the submarine cable body, and the elastic member is in a compressed state when the protective sleeve wraps the outside of the submarine cable body.

[0015] In another aspect, a construction method of the scour-resistant submarine cable structure is also provided, and the scour-resistant submarine cable structure is provided, and the method comprises the following steps:

[0016] The submarine cable body is fixedly connected with the connecting seat, the bionic grass is laid on the protective sleeve on both sides of the connecting seat, and the water-absorbing expansion component is installed at one end of the protective sleeve away from the connecting seat;

[0017] The protective sleeve on both sides of the submarine cable body is wrapped around the submarine cable body from both sides of the submarine cable body, and the water-absorbing expansion components at both ends are fixedly connected by using a hydrolysis glue which can be dissolved in water, so as to form a scour-resistant submarine cable wrapping structure.

[0018] The power device is used to lay the anti-scouring submarine cable wrapping structure at the preset position on the seabed, the hydrolytic glue is dissolved under the action of seawater, the protective cover on both sides of the submarine cable body is opened and laid flat on the seabed towards both sides of the submarine cable body, the bionic grass is exposed, the anti-scouring submarine cable unfolding structure is formed, and the water-absorbing expansion parts at both ends absorb water to expand, so as to press and fix the protective cover and the submarine cable body on the seabed.

[0019] The present application has the following beneficial effects:

[0020] The anti-scouring submarine cable structure of the present application is characterized in that the submarine cable body is fixedly connected to the connecting seat of the protective assembly, and the submarine cable body is wrapped by the protective cover at both ends of the connecting seat, the water-absorbing expansion parts at both ends of the protective cover are fixed by the hydrolytic glue, and the anti-scouring submarine cable wrapping structure is formed, so that the whole anti-scouring submarine cable wrapping structure can be laid on the seabed by the power device. When the anti-scouring submarine cable wrapping structure is laid on the seabed, the hydrolytic glue is dissolved under the action of seawater, the water-absorbing expansion parts are opened and stretched towards both sides of the submarine cable body along with the protective cover, and the water-absorbing expansion parts absorb water to expand, so as to press and fix the protective cover on the seabed. Then, the protective cover is laid on both sides of the submarine cable body, the bionic grass on the protective cover is opened and stretched, and when the water flow slows down and flows through the bionic grass, the water flow is subjected to the flexible viscous damping effect of the bionic grass, the flow rate is reduced, and the scouring ability of the water flow on the seabed is reduced.

[0021] Further, due to the reduction of the flow rate and the hindering effect of the bionic grass, the silt carried in the water flow is deposited under the action of gravity, and the seabed shoal is formed in the bionic grass arrangement area, so as to reduce the seabed scouring and avoid the generation of secondary scouring problems. In addition, when the seabed water flow flows through the water-absorbing expansion parts at the edges, the water-absorbing expansion parts can also slow down the water flow, so as to avoid that the high-speed water flow directly scours the root part of the bionic grass, thereby effectively avoiding the bionic grass from being laid flat and improving the anti-scouring effect of the bionic grass. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic diagram of the anti-scouring submarine cable structure (wrapped state) in one of the embodiments;

[0023] Figure 2 is a structural schematic diagram of the anti-scouring submarine cable structure (unfolding state) in one of the embodiments;

[0024] Figure 3 is a structural schematic diagram of one side of the anti-scouring submarine cable structure (wrapped state) in one of the embodiments;

[0025] Figure 4 is a structural schematic diagram of one side of the anti-scouring submarine cable structure (unfolding state) in one of the embodiments;

[0026] Figure 5is a schematic view of a connecting structure of the submarine cable body and the protection assembly in one embodiment;

[0027] Figure 6 is a schematic view of a partial sectional structure of the water-absorbing and swelling component in one embodiment.

[0028] In the drawings:

[0029] 100, submarine cable body; 110, core; 120, insulation layer; 130, shielding layer; 140, protection layer; 141, clamping groove; 142, retreat-preventing groove; 200, protection assembly; 210, connecting seat; 211, clamping convex; 212, extension; 220, protection sleeve; 300, bionic grass; 400, water-absorbing and swelling component; 410, hydrophilic non-woven fabric cover; 420, accommodating cavity; 430, water-absorbing and swelling agent; 500, hydrolytic glue; 600, locking member; 610, first locking belt; 611, lock; 620, second locking belt; 621, locking part; 700, elastic member. DETAILED DESCRIPTION

[0030] The application will be further described below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are merely intended for explaining the application, but not limiting the application. In addition, it should be noted that, for the convenience of description, only the parts related to the application are shown in the drawings, but not all the structures.

[0031] In the description of the application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood in a broad sense, for example, it can be fixedly connected, or detachably connected, or integrated; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0032] In the application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "under" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0033] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0034] like Figures 1 to 6 As shown, an anti-scour submarine cable structure of this embodiment includes a submarine cable body 100 and a protective assembly 200. The protective assembly 200 includes a connecting seat 210, which is fixedly connected to the submarine cable body 100. Protective sleeves 220 are provided on both sides of the connecting seat 210. The protective sleeves 220 are covered with bionic grass 300. The end of the protective sleeve 220 away from the connecting seat 210 is provided with a water-absorbing and expanding component 400. The protective sleeves 220 on both sides respectively wrap the submarine cable body 100 from both sides. The two water-absorbing and expanding components 400 are bonded and fixed by a water-soluble hydrolytic glue 500. The roots of the bionic grass 300 are embedded and sewn into the interior of the protective sleeve 220. The upper part of the bionic grass 300 is made of a flexible material. The upper part of the bionic grass 300 naturally expands when exposed to seawater, so that the passing seawater flow is buffered and the intensity of the water flow on the submarine cable body 100 is reduced.

[0035] In this embodiment, the cable body 100 is fixedly connected to the connection base 210 of the protective assembly 200, and the cable body 100 is wrapped by the protective sleeves 220 at both ends of the connection base 210. The water-swellable components 400 at both ends of the protective sleeve 220 are bonded and fixed by hydrolyzed glue 500 to form an anti-scour cable wrap structure, thereby facilitating the laying of the entire anti-scour cable wrap structure on the seabed via a power device (not shown). After the anti-scour cable wrap structure is laid on the seabed, the hydrolyzed glue 500 dissolves under the action of seawater, and the water-swellable components 400 expand and unfold toward both sides of the cable body 100 along with the protective sleeve 220. At the same time, the water-swellable components 400 absorb water and expand, pressing the protective sleeve 220 tightly and fixing it to the seabed. Then the protective cover 220 is laid on both sides of the submarine cable body 100, so that the bionic grass 300 on the protective cover 220 stretches and opens. When the water flow slows down and flows through the bionic grass 300, it is affected by the flexible viscous damping of the bionic grass 300, the flow rate is reduced, and the scouring ability of the water flow on the seabed is slowed down.

[0036] Further, due to the reduction of flow velocity and the hindering effect of the bionic grass 300, the sediment carried in the water flow is deposited under the action of gravity, forming a seabed shoal in the area where the bionic grass 300 is arranged, thereby slowing down the scouring of the seabed and avoiding the occurrence of secondary scouring problems. In addition, when the seabed water flow flows through the edge water-absorbing expansion component 400, the water-absorbing expansion component 400 can also slow down the water flow, avoiding the direct scouring of the root of the bionic grass 300 by the high-speed water flow, thereby effectively avoiding the lodging of the bionic grass 300 and improving the anti-scouring effect of the bionic grass 300.

[0037] In one embodiment, the submarine cable body 100 comprises a core 110, the outside of which is sequentially wrapped with an insulation layer 120, a shielding layer 130 and a protective layer 140, and the protective layer 140 is fixedly connected with the connecting seat 210. Specifically, the core 110 is made of conductive material, and the main material commonly used in actual operation is copper, which is used for transmitting electric energy; the insulation layer 120 is made of insulating material to ensure the insulation protection of the core 110; the shielding layer 130 ensures effective transmission of electric energy in an electromagnetic interference environment; the protective layer 140 is arranged at the outermost side as a sealing sheath, and is made of high-strength and seawater corrosion-resistant composite material to prolong the service life of the submarine cable body 100 and ensure the normal operation of the submarine cable body 100 in various harsh environments.

[0038] In one embodiment, the protective layer 140 is provided with a clamping groove 141, and the connecting seat 210 is provided with a clamping protrusion 211 matched with the clamping groove 141, and the clamping protrusion 211 and the clamping groove 141 are matched to realize the fixed connection between the connecting seat 210 and the protective layer 140, thereby realizing the fixed connection between the connecting seat 210 and the submarine cable body 100. Further, as shown in the figure, the two ends of the clamping groove 141 are provided with a retreat prevention groove 142, and the two ends of the clamping protrusion 211 are provided with an extension part 212, and the two ends of the extension part 212 are respectively inserted into the retreat prevention grooves 142 at the two ends of the clamping groove 141, thereby increasing the stability of the fixed connection between the connecting seat 210 and the submarine cable body 100.

[0039] In one embodiment, the length direction of the connecting seat 210, the protective sleeve 220 and the water-absorbing expansion component 400 extends along the axis direction of the submarine cable body 100, so that the connecting seat 210 can realize the support of the entire submarine cable body 100, the protective sleeve 220 can ensure the protection of the entire submarine cable body 100, and the water-absorbing expansion component 400 can press and fix the protective sleeve 220 after water absorption and expansion, and slow down the water flow speed of the bionic grass 300 on the protective sleeve 220.

[0040] In one of the embodiments, the two side protective sleeves 220 and the water-absorbing expansion components 400 are arranged symmetrically with respect to the radial central axis of the submarine cable body 100, so as to keep the two side protective sleeves 220 and the water-absorbing expansion components 400 in force balance, and keep the submarine cable body 100 in force balance on both sides, thereby ensuring the stability of the overall structure.

[0041] In one of the embodiments, the bionic grass 300 is arranged in a matrix on the protective sleeve 220, the length direction of the matrix is parallel to the axial direction of the submarine cable body 100, and the width direction of the matrix is parallel to the radial direction of the submarine cable body 100, so as to improve the effect of the bionic grass 300 on effectively blocking and reducing the water flow in the axial direction and the radial direction of the submarine cable body 100, reduce the influence of the water flow on the submarine cable body 100, and be conducive to maintaining the stability of the submarine cable body 100.

[0042] In one of the embodiments, the water-absorbing expansion component 400 comprises an elastic hydrophilic non-woven fabric sleeve 410, the hydrophilic non-woven fabric sleeve 410 is provided with a containing cavity 420, and the containing cavity 420 is filled with a water-absorbing expansion agent 430. After entering the seawater, the seawater easily enters the containing cavity 420 through the hydrophilic non-woven fabric sleeve 410, the water-absorbing expansion agent 430 in the containing cavity 420 absorbs the seawater to expand, and the elastic hydrophilic non-woven fabric sleeve 410 is expanded outward, so that the overall volume and weight of the water-absorbing expansion component 400 are increased, the protective sleeve 220 is compressed and fixed, and the effect of slowing down the water flow is achieved, thereby avoiding the direct impact of the water flow on the roots of the bionic grass 300. In actual operation, the water-absorbing expansion agent 430 is a high-molecular water-absorbing expansion agent 430 particle, which has the advantages of high water absorption, strong water retention, high expansion, high stability, good safety, reusability, environmental protection, etc. The long-term use in the seabed will not cause environmental pollution, and it can also be recycled and reused.

[0043] In one of the embodiments, the connecting seat 210 is provided with a locking member 600, the locking member 600 comprises a locking belt, the locking belt comprises a first locking belt 610 and a second locking belt 620 fixed on both ends of the connecting seat 210 respectively, the first locking belt 610 and the second locking belt 620 are arranged on both sides of the submarine cable body 100 in the radial direction respectively, the first locking belt 610 and the second locking belt 620 are wrapped around the submarine cable body 100 from both sides of the submarine cable body 100 respectively, one end of the first locking belt 610 away from the connecting seat 210 is provided with a lock buckle 611, one end of the second locking belt 620 away from the connecting seat 210 is provided with a locking portion 621, and the locking portion 621 is in locking connection with the lock buckle 611.

[0044] In actual operation, as shown in FIG. 6, the first locking belt 610 and the second locking belt 620 are wrapped around the submarine cable body 100 from both sides of the submarine cable body 100 respectively, and the first locking belt 610 and the second locking belt 620 are in locking connection with each other. Figure 2 and Figure 4As shown, the locking member 600 is configured as a cable tie structure. Of course, the locking member 600 can also adopt a ring buckle, chain or other structures. As long as the connection seat 210 and the submarine cable body 100 can be fixedly connected and locked, such designs all fall within the scope of protection of the present invention.

[0045] In one embodiment, an elastic member 700 is provided on the side of the protective cover 220 facing the cable body 100. When the protective cover 220 is wrapped around the outside of the cable body 100, the elastic member 700 is in a compressed state. Specifically, when the entire structure is laid on the seabed, the hydrolyzed gel 500 dissolves under the action of seawater. When the protective cover 220 stretches and opens toward the sides of the cable body 100, the elastic member 700 can provide a force to separate the protective cover 220 from the cable body 100, allowing the protective cover 220 to stretch and open toward the sides of the cable body 100 more easily and ensuring that the protective cover 220 stretches to the maximum extent, thereby preventing the protective cover 220 from wrinkling and folding when it is opened, which would affect the anti-scouring effect of the protective cover 220 and the bionic grass 300 installed on the protective cover 220.

[0046] In actual operation, the elastic member 700 is a spring, which is simple to obtain and easy to install. Of course, other elastic materials such as elastic telescopic rods, elastic rubber, etc. can also be used. As long as it can provide a separation force when the protective cover 220 is separated from the submarine cable body 100, such designs all fall within the scope of protection of the present invention.

[0047] On the other hand, Figures 1 to 6 As shown, a construction method of an anti-scour submarine cable structure is also provided, comprising the following steps:

[0048] The submarine cable body 100 is fixedly connected to the connection seat 210, and bionic grass 300 is laid on the protective sleeves 220 on both sides of the connection seat 210. A water-absorbing expansion component 400 is installed on the end of the protective sleeve 220 away from the connection seat 210;

[0049] The protective sleeves 220 on both sides of the submarine cable body 100 are wrapped around the submarine cable body 100 from both sides, and the water-swellable components 400 at both ends are bonded and fixed using a water-soluble hydrolyzed glue 500 to form an anti-scour submarine cable wrapping structure;

[0050] A power device (not shown) is used to lay the anti-scouring cable wrapping structure at a preset position on the seabed. The hydrolyzed gel 500 dissolves under the action of seawater, and the protective sleeves 220 on both sides of the cable body 100 are opened toward both sides of the cable body 100 and laid flat on the seabed, exposing the bionic grass 300 to form an anti-scouring cable deployment structure. The water-absorbing and expanding components 400 at both ends absorb water and expand to press and fix the protective sleeves 220 and the cable body 100 on the seabed.

[0051] The method is simple and convenient in operation, can easily realize the laying of the submarine cable, solves the problem of the submarine cable scouring, only needs to lay the whole scouring prevention submarine cable wrapping structure to the preset position, the scouring prevention submarine cable wrapping structure can naturally expand to form a scouring prevention submarine cable expansion structure, can effectively realize the scouring prevention effect, and does not need manual diving laying, reduces the construction cost, and is high in operation safety.

[0052] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present application. Here, all the embodiments need not and cannot be exhausted. Any modification, equivalent substitution and improvement within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. An anti-scour submarine cable structure, characterized in that: The subsea cable body (100) and the protection assembly (200) are provided, the protection assembly (200) comprises a connecting seat (210) fixedly connected with the subsea cable body (100), both sides of the connecting seat (210) are provided with a protective sleeve (220), the protective sleeve (220) is laid with bionic grass (300), one end of the protective sleeve (220) away from the connecting seat (210) is provided with a water-absorbing expansion component (400), both sides of the protective sleeve (220) are respectively wrapped around the subsea cable body (100) from both sides of the subsea cable body (100), and the two water-absorbing expansion components (400) are fixedly connected through water-soluble hydrolysis glue (500).

2. A scour protection marine cable structure according to claim 1, characterised in that, The subsea cable body (100) comprises a core (110), and the core (110) is sequentially wrapped with an insulation layer (120), a shielding layer (130) and a protection layer (140).

3. A scour protection marine cable structure according to claim 2, characterised in that, The protection layer (140) is provided with a clamping groove (141), and the connecting seat (210) is provided with a clamping convex (211) matched with the clamping groove (141).

4. A scour protection marine cable structure according to any one of claims 1 to 3, characterised in that, The length direction of the connecting seat (210), the protective sleeve (220) and the water-absorbing expansion component (400) extends along the axial direction of the subsea cable body (100).

5. A scour protection marine cable structure according to any one of claims 1 to 3, characterised in that, Both sides of the protective sleeve (220) and the water-absorbing expansion component (400) are symmetrically arranged along the radial middle axis of the subsea cable body (100).

6. A scour protection marine cable structure according to any one of claims 1 to 3, characterised in that, The bionic grass (300) is arranged in a matrix on the protective sleeve (220), the length direction of the matrix is parallel to the axial direction of the subsea cable body (100), and the width direction of the matrix is parallel to the radial direction of the subsea cable body (100).

7. A scour protection marine cable structure according to any one of claims 1 to 3, characterised in that, The water-absorbing expansion component (400) comprises an elastic hydrophilic non-woven fabric sleeve (410), the hydrophilic non-woven fabric sleeve (410) is provided with a containing cavity (420), and the containing cavity (420) is filled with a water-absorbing expansion agent (430).

8. A scour protection marine cable structure according to any one of claims 1 to 3, characterised in that, The connecting seat (210) is provided with a locking piece (600), the locking piece (600) comprises a locking belt, the locking belt comprises a first locking belt (610) and a second locking belt (620) fixedly arranged at both ends of the connecting seat (210), the first locking belt (610) and the second locking belt (620) are arranged on both sides of the subsea cable body (100) along the radial direction, the first locking belt (610) and the second locking belt (620) are respectively wrapped around the subsea cable body (100) from both sides of the subsea cable body (100), one end of the first locking belt (610) away from the connecting seat (210) is provided with a lock buckle (611), one end of the second locking belt (620) away from the connecting seat (210) is provided with a locking part (621), and the locking part (621) is in locking connection with the lock buckle (611).

9. A scour protection marine cable structure according to any one of claims 1 to 3, characterised in that, The protective sleeve (220) is provided with an elastic member (700) on the side facing the submarine cable body (100), and the elastic member (700) is in a compressed state when the protective sleeve (220) is wrapped outside the submarine cable body (100).

10. A method of construction of a scour protected submarine cable structure, characterised in that, The scour-resistant submarine cable structure of any one of claims 1 to 9 is provided, comprising the following steps: The submarine cable body (100) is fixedly connected with the connecting seat (210), and the bionic grass (300) is laid on the protective sleeve (220) on both sides of the connecting seat (210), and the water-absorbing expansion component (400) is installed at the end of the protective sleeve (220) away from the connecting seat (210); The protective sleeve (220) on both sides of the submarine cable body (100) is wrapped around the submarine cable body (100) from both sides of the submarine cable body (100), and the water-absorbing expansion component (400) at both ends is fixedly bonded by using the water-soluble hydrolysis glue (500), forming a scour-resistant submarine cable wrapping structure; The scour-resistant submarine cable wrapping structure is laid on the preset position of the seabed by using a power device, the hydrolysis glue (500) is dissolved under the action of seawater, the protective sleeve (220) on both sides of the submarine cable body (100) opens towards both sides of the submarine cable body (100) and lays flat on the seabed, exposing the bionic grass (300), forming a scour-resistant submarine cable unfolding structure, and the water-absorbing expansion component (400) at both ends absorbs water and expands, so as to press and fix the protective sleeve (220) and the submarine cable body (100) on the seabed.

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