Submarine cable protection device and protection method thereof

Abstract

The invention relates to the technical field of submarine cable protection equipment, in particular to a submarine cable protection device which comprises submarine cable protection units, a plurality of submarine cable protection units are sequentially spliced to form the submarine cable protection device, and each submarine cable protection unit comprises an inner submarine cable fixing device, an elastic connecting piece and an outer protection device. The inner-layer submarine cable fixing device comprises an arc-shaped fixing part and a stabilizing part; the arc-shaped fixing part is arranged in the center of the interior of the stabilizing part, the arc-shaped fixing part is used for fixedly installing a submarine cable, the arc-shaped fixing part and the stabilizing part are connected into an integrated structure, the stabilizing part of the inner submarine cable fixing device is connected with the outer protection device through an elastic connecting piece, and the outer protection device is provided with the fixing part. And the adjacent outer-layer protection devices are connected through the fixing parts. The submarine cable protection units are sequentially spliced to realize modular splicing, so that the stability of the submarine cable protection device can be improved; and by arranging the elastic connecting piece, a buffering effect is achieved, and the preset laying position of the submarine cable is protected against displacement caused by water flow and other environments.

Description

Technical Field

[0001] The present invention relates to the technical field of submarine cable protection equipment, and in particular to a submarine cable protection device and a protection method thereof. Background Art

[0002] With the rapid development of new energy projects such as offshore wind power, the installed capacity of offshore wind power is growing, and the demand for submarine cables is also increasing year by year. The operation and maintenance of offshore wind farms and power generation require a large number of submarine cables to connect with the land power grid. Submarine cables have become a key infrastructure for offshore energy development and transmission. In addition, according to the spatial distribution characteristics of submarine cables, most submarine cables are laid on the seabed, where the water flow environment is complex. Under the influence of hydrodynamics, the submarine cable laying area is eroded, causing damage to the submarine cables.

[0003] The protection of cables laid on the seabed mainly involves suppressing or reducing the scouring of seabed currents. The existing protection technology scheme mainly involves burying the submarine cable, which is also the most widely used protection technology scheme in the world. This technology conducts preliminary seabed environmental surveys to determine the burial route, and then buries the submarine cable to a certain depth so that the submarine cable is located below the seabed, completely isolating the seabed current from the buried submarine cable, and avoiding the impact of the scouring of the seabed currents on the upper side and the left and right sides of the submarine cable. However, in actual construction and application, this technology also has many technical shortcomings, and the construction is difficult. With the increase of water depth, it is affected by factors such as strong ocean currents and geological changes, and the difficulty of laying trenches increases dramatically, making it difficult to locate the submarine cable. In addition, with the increase of service life, the submarine cable suffers from fatigue aging or failure damage. When the submarine cable needs to be repaired, it needs to be re-excavated, which is also difficult to maintain. The patent document with application number 202410004126.X discloses a submarine cable protection device, which discloses a first counterweight block, a second counterweight block is arranged above the first counterweight block, and a plurality of first engaging grooves are opened on the top surface of the first counterweight block; a plurality of first fastening bolts are inserted through the top surface of the second counterweight block; when the first counterweight block and the second counterweight block are docked and installed, the first fastening bolts pass through the second counterweight block and are inserted into the first engaging groove. The device is heavy and cumbersome to operate. Summary of the invention

[0004] In order to solve the above technical problems existing in the prior art, the present invention provides a submarine cable protection device and a protection method thereof.

[0005] In order to achieve the above-mentioned purpose, the present invention proposes a submarine cable protection device, comprising: a submarine cable protection unit, a plurality of the submarine cable protection units are spliced ​​in sequence to form the submarine cable protection device, the submarine cable protection unit, an inner submarine cable fixing device, an elastic connecting piece and an outer protective device, the inner submarine cable fixing device comprises an arc-shaped fixing portion and a stabilizing portion; the arc-shaped fixing portion is arranged at the inner center of the stabilizing portion, the arc-shaped fixing portion is used to fix and install the submarine cable, and the arc-shaped fixing portion is connected to the stabilizing portion to form an integral structure, and the stabilizing portion of the inner submarine cable fixing device is connected to the outer protective device through the elastic connecting piece. The submarine cable protection units are spliced ​​in sequence to achieve modular splicing, which can fix the submarine cable and protect it from scouring, and can also increase the stability of the submarine cable protection device. By setting an arc-shaped fixing part, the structure is simple, and the submarine cable can be effectively positioned and fixed; by setting an outer protective device, the oblique guard plates on both sides of the outer layer of the outer protective device are matched through hinges and elastic connectors placed in the inner and outer guard plates to achieve buffering and reduction of water flow impact, which can reduce the impact force of the water flow while playing a buffering role, and prevent the scouring damage to the submarine cable caused by the water flow from the horizontal sides of the submarine cable; an elastic connector is set between the inner submarine cable fixing device and the outer protective device to play a buffering role and protect the predetermined laying position of the submarine cable from displacement caused by water flow and other environmental factors.

[0006] As an optional embodiment, in the submarine cable protection device provided by the present invention, the stabilizing portion includes a top plate, a first side plate and a second side plate, the first side plate and the second side plate are respectively disposed on both sides of the top plate, the first side plate and the second side plate are inclined, and the top plate, the first side plate and the second side plate form a trapezoidal structure. The stability of the device can be enhanced by providing the stabilizing portion, and the arc-shaped fixing portion can be stably installed to fix the submarine cable.

[0007] As an optional embodiment, in the submarine cable protection device provided by the present invention, the arc-shaped fixing portion includes a first arc-shaped portion, a second arc-shaped portion and a third arc-shaped portion, the first arc-shaped portion is connected to the top plate, the second arc-shaped portion is connected to the end of the first side plate, and the third arc-shaped portion is connected to the end of the second side plate. By setting the arc-shaped fixing portion to actually contact the submarine cable, the position of the submarine cable is fixed, and at the same time, the stabilizing portion and the outer protective device are used to increase the counterweight of the entire protective device, ensuring fixation with the seabed, and protecting the laying position of the submarine cable from environmental influences such as water flow.

[0008] As an optional embodiment, in the submarine cable protection device provided by the present invention, a central through hole is provided at the connection between the top plate and the first arc-shaped portion. Providing a central through hole at the connection between the top plate and the first arc-shaped portion can save costs, allow the incoming flow to flow through the hollow hole, achieve a diversion effect, reduce the impact of the water flow on the device, and is also conducive to the stability of the device.

[0009] As an optional embodiment, in the submarine cable protection device provided by the present invention, one end of the stabilizing part is provided with an inner connector, and the other end of the stabilizing part is provided with an outer connector, and the inner connector of the stabilizing part can be inserted into the outer connector of the adjacent stabilizing part and the two are fixedly connected by bolts. By providing the inner and outer connectors, it is convenient to splice and connect multiple submarine cable protection units, which is convenient for subsequent construction, and the submarine cable protection units are spliced ​​in sections according to regions, which reduces the construction cost of laying the entire device, is easy to operate, and can speed up the construction efficiency of laying submarine cables.

[0010] As an optional embodiment, in the submarine cable protection device provided by the present invention, the outer layer protection device includes a transverse top plate and an oblique guard plate, the oblique guard plates are provided on both sides of the transverse top plate, the oblique guard plates are hinged to the transverse top plate, the two oblique guard plates are tilted, and the two oblique guard plates are connected to the stabilizing portion through the elastic connector. The oblique guard plates on both sides of the outside are connected to the transverse top plate through hinges, and the inner and outer protection devices are matched through a central elastic connector to achieve buffering and reduction of water flow impact, which can reduce the impact force of the water flow while playing a buffering role.

[0011] As an optional embodiment, in the submarine cable protection device provided by the present invention, one end of the oblique guard plate is provided with an inner connection part, and the other end of the oblique guard plate is provided with an outer connection part, and the inner connection part of the oblique guard plate can be inserted into the outer connection part of the adjacent oblique guard plate and the two are fixedly connected by bolts. By providing the inner and outer connection parts, it is convenient to splice and connect multiple submarine cable protection units, enhance the fixing effect, and splice the submarine cable protection units in sections according to regions, thereby reducing the construction cost of laying the entire device, facilitating operation, and accelerating the efficiency of submarine cable laying.

[0012] As an optional embodiment, in the submarine cable protection device provided by the present invention, the submarine cable protection unit includes a plurality of the elastic connectors, and the inner submarine cable fixing device is connected to the outer protection device through the plurality of the elastic connectors. A plurality of elastic connectors are installed between the inner submarine cable fixing device and the outer protection device. The specific number and strength of the elastic connectors can be determined according to the intensity of scouring in the laying area. The elastic connectors are fixed to the inner submarine cable fixing device and the outer protection device through the protective rings at the plate connection at both ends. Under the influence of water flow, part of the water flows out in two directions parallel to the oblique guard plate, and part of the water flows directly impact the oblique guard plate. The elastic connector is compressed, and the influence of the force is suppressed. This dynamic change process can reduce part of the impact force of the water flow to protect the inner inner submarine cable fixing device from being impacted by the water flow, thereby protecting the submarine cable.

[0013] Furthermore, the present invention also provides a protection method based on the above-mentioned submarine cable protection device, comprising the following steps:

[0014] S1: Determine the installation position of the submarine cable, splice and connect a plurality of the submarine cable protection units, and fix and lay the submarine cable in the arc-shaped fixing part after the splicing is completed;

[0015] S2: Throwing stones into the stabilizing part of the spliced ​​submarine cable protection device;

[0016] S3: Repeat the above steps to perform multi-stage splicing and riprap to secure the entire submarine cable.

[0017] In the protection method of the above-mentioned submarine cable protection device, a plurality of the submarine cable protection units are spliced ​​in sequence to form the submarine cable protection device, which not only fixes the submarine cable but also plays an anti-scouring protection role and can increase the stability of the submarine cable protection device. Stones or other fillers are thrown into the stabilizing part of the spliced ​​submarine cable protection device to increase the weight of the submarine cable protection device itself so as to fix the entire submarine cable protection device to the seabed. The submarine cable is doubly protected from scouring and can exert a protective effect for a long time without being knocked down by the water flow. The self-weight and structure of the device can ensure that it is fixed in the ocean current for a long time.

[0018] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0019] First, the submarine cable protection device provided by the present invention is provided with a submarine cable protection unit, and a plurality of the submarine cable protection units are spliced ​​in sequence to form the submarine cable protection device. The submarine cable protection units are spliced ​​in sequence to achieve modular splicing, which can fix the submarine cable and play an anti-scouring protection role at the same time, and can also increase the stability of the submarine cable protection device. By providing an inner submarine cable fixing device, an elastic connector and an outer protection device, the inner submarine cable fixing device includes an arc-shaped fixing part and a stabilizing part; the arc-shaped fixing part is arranged at the inner center of the stabilizing part, the arc-shaped fixing part is used to fix and install the submarine cable, and the arc-shaped fixing part is connected with the stabilizing part to form an integrated structure, and the stability of the inner submarine cable fixing device The inner part is connected to the outer protective device through an elastic connector; by setting the arc-shaped fixing part, the structure is simple and the operation is convenient, and the submarine cable can be effectively positioned and fixed; by setting the outer protective device, the oblique guard plates on both sides of the outer layer of the outer protective device cooperate with the hinges and the elastic connectors in the inner and outer guard plates to achieve the buffering and reduction of the impact of the water flow, which can reduce the impact of the water flow while playing a buffering role, and prevent the scouring and damage of the submarine cable caused by the water flow from the horizontal sides of the submarine cable; an elastic connector is set between the inner submarine cable fixing device and the outer protective device to play a buffering role, so as to protect the predetermined laying position of the submarine cable from the displacement caused by the water flow and other environmental factors.

[0020] 2. The submarine cable protection device provided by the present invention is provided with a transverse top plate and an oblique guard plate. Oblique guard plates are provided on both sides of the transverse top plate. The oblique guard plates are hinged to the transverse top plate. The two oblique guard plates are tilted. The two oblique guard plates are connected to the stabilizing portion through elastic connectors. The oblique guard plates on both sides of the outside are connected to the transverse top plate through hinges, and the inner and outer protection devices are matched through a central elastic connector, so as to buffer and reduce the impact of water flow, which can reduce the impact force of the water flow while playing a buffering role.

[0021] 3. In the protection method of the submarine cable protection device provided by the present invention, a plurality of the submarine cable protection units are spliced ​​in sequence to form the submarine cable protection device, which not only fixes the submarine cable but also plays an anti-scouring protection role and can increase the stability of the submarine cable protection device. Stones or other fillers are thrown into the stabilizing part of the spliced ​​submarine cable protection device to increase the weight of the submarine cable protection device itself so as to fix the entire submarine cable protection device to the seabed. The submarine cable is doubly protected from scouring and can exert a protective effect for a long time without being knocked down by the water flow. The deadweight and structure of the device can ensure that it is fixed for a long time in the ocean current. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0023] Figure 1 A schematic structural diagram of a submarine cable protection unit of a submarine cable protection device provided by the present invention;

[0024] Figure 2 A schematic top view of a submarine cable protection unit of the submarine cable protection device provided by the present invention;

[0025] Figure 3 A schematic side view of a submarine cable protection unit of the submarine cable protection device provided by the present invention;

[0026] Figure 4 This is a schematic structural diagram of the inner submarine cable fixing device provided by the present invention.

[0027] [Description of Reference Numerals]

[0028] 1. Inner submarine cable fixing device; 11. Arc-shaped fixing part; 111. First arc-shaped part; 112. Second arc-shaped part; 113. Third arc-shaped part; 12. Stabilizing part; 121. Top plate; 122. First side plate; 123. Second side plate; 13. Middle through hole; 14. Inner connecting piece; 15. Outer connecting piece;

[0029] 2. Elastic connector;

[0030] 3. Outer protective device; 31. Horizontal top plate; 32. Oblique guard plate; 321. Inner connecting part; 322. Outer connecting part;

[0031] 4. Fixed part. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that all directional indications in the embodiments of the present invention, such as first, second, up, down, left, right, front, back, etc., are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0034] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0035] The present invention provides a submarine cable protection device, such as Figure 1-Figure 4As shown, it comprises: a submarine cable protection unit, a plurality of the submarine cable protection units are sequentially spliced ​​to form the submarine cable protection device, the submarine cable protection unit, an inner submarine cable fixing device 1, an elastic connector 2 and an outer protection device 3, the inner submarine cable fixing device 1 comprises an arc-shaped fixing portion 11 and a stabilizing portion 12; the arc-shaped fixing portion 11 is arranged at the inner center of the stabilizing portion 12, the arc-shaped fixing portion 11 is used to fix and install the submarine cable, and the arc-shaped fixing portion 11 and the stabilizing portion 12 are connected to form an integral structure, the stabilizing portion 12 of the inner submarine cable fixing device 1 is connected to the outer protection device 3 through the elastic connector 2, the outer protection device 3 is provided with a fixing portion, and adjacent outer protection devices 3 are connected through the fixing portion. The submarine cable protection units are spliced ​​in sequence to achieve modular splicing, which can fix the submarine cable and protect it from scouring, and can also increase the stability of the submarine cable protection device. By setting the arc-shaped fixing part 11, the structure is simple, and the submarine cable can be effectively positioned and fixed; by setting the outer layer protection device 3, the oblique guard plates 32 on both sides of the outer layer protection device 3 are matched through hinges and elastic connectors 2 placed in the inner and outer guard plates to achieve buffering and reduction of water flow impact, which can reduce the impact force of the water flow while playing a buffering role, and prevent the scouring damage to the submarine cable caused by the water flow from the horizontal sides of the submarine cable; an elastic connector 2 is set between the inner layer submarine cable fixing device 1 and the outer layer protection device 3 to play a buffering role and protect the predetermined laying position of the submarine cable from being affected by the displacement of the environment such as water flow, wherein the elastic connector is a spring.

[0036] like Figure 2 As shown, in the submarine cable protection device provided by the present invention, the stabilizing portion 12 includes a top plate 121, a first side plate 122 and a second side plate 123. The first side plate 122 and the second side plate 123 are respectively disposed on both sides of the top plate 121. The first side plate 122 and the second side plate 123 are arranged obliquely, and the top plate 121 forms a trapezoidal structure with the first side plate 122 and the second side plate 123. The stabilizing portion 12 can enhance the stability of the device, and the arc-shaped fixing portion 11 can be stably installed to fix the submarine cable.

[0037] In the submarine cable protection device provided by the present invention, if Figure 2 As shown, the arc-shaped fixing portion 11 includes a first arc-shaped portion 111, a second arc-shaped portion 112 and a third arc-shaped portion 113, wherein the first arc-shaped portion 111 is connected to the top plate 121, the second arc-shaped portion 112 is connected to the end of the first side plate 122, and the third arc-shaped portion 113 is connected to the end of the second side plate 123. The arc-shaped fixing portion 11 is arranged to be in actual contact with the submarine cable to fix the position of the submarine cable, and at the same time cooperates with the stabilizing portion 12 and the outer protective device 3 to increase the counterweight of the entire protective device, thereby ensuring fixation with the seabed and protecting the laying position of the submarine cable from environmental influences such as water flow.

[0038] Further, in the submarine cable protection device provided by the present invention, a central through hole 13 is provided at the connection between the top plate 121 and the first arc-shaped portion 111. Providing the central through hole 13 at the connection between the top plate 121 and the first arc-shaped portion 111 can save costs, allow the incoming flow to flow through the hollow hole, achieve a diversion effect, reduce the impact of the water flow on the device, and is also conducive to the stability of the device.

[0039] In addition, an inner connector 14 is provided at one end of the stabilizing portion 12, and an outer connector 15 is provided at the other end of the stabilizing portion 12. The inner connector 14 of the stabilizing portion 12 can be inserted into the outer connector 15 of the adjacent stabilizing portion 12 and the two are fixedly connected by bolts. By providing the inner and outer connectors 15, it is convenient to splice and connect multiple submarine cable protection units, which is convenient for subsequent construction. The submarine cable protection units are spliced ​​in sections according to regions, which reduces the construction cost of laying the entire device, is easy to operate, and can speed up the construction efficiency of laying submarine cables.

[0040] like Figure 1 As shown, in the submarine cable protection device provided by the present invention, the outer layer protection device 3 includes a horizontal top plate 31 and an oblique guard plate 32. The oblique guard plates 32 are provided on both sides of the horizontal top plate 31. The oblique guard plates 32 are hinged to the horizontal top plate 31. The two oblique guard plates 32 are tilted, and the two oblique guard plates 32 are connected to the stabilizing portion 12 through the elastic connector 2. The oblique guard plates 32 on both sides of the outside are connected to the horizontal top plate 31 through hinges, and the inner and outer protection devices cooperate through the central elastic connector 2 to achieve buffering and reduction of water flow impact, which can reduce the impact force of the water flow while playing a buffering role.

[0041] In order to enhance the fixing effect, in the submarine cable protection device provided by the present invention, one end of the oblique guard plate 32 is provided with an inner connection part 321, and the other end of the oblique guard plate 32 is provided with an outer connection part 322, and the inner connection part 321 of the oblique guard plate 32 can be inserted into the outer connection part 322 of the adjacent oblique guard plate 32 and the two are fixedly connected by bolts. By providing the inner and outer connection parts 322, it is convenient to splice and connect multiple submarine cable protection units, enhance the fixing effect, and splice the submarine cable protection units in sections according to regions, reduce the construction cost of laying the overall device, facilitate operation, and speed up the construction efficiency of submarine cable laying.

[0042] Furthermore, the submarine cable protection unit includes a plurality of the elastic connectors 2, and the inner submarine cable fixing device 1 is connected to the outer protection device 3 through the plurality of the elastic connectors 2. A plurality of elastic connectors 2 are installed between the inner submarine cable fixing device 1 and the outer protection device 3, and the specific number and strength of the elastic connectors 2 can be determined according to the scouring strength of the laying area. The elastic connectors 2 are fixed to the inner submarine cable fixing device 1 and the outer protection device 3 through the plate connection rings at both ends. Under the influence of the water flow, part of the water flows out in two directions parallel to the oblique guard plate 32, and part of the water flows directly impact the oblique guard plate 32, the elastic connector 2 is compressed, and the force influence is suppressed. This dynamic change process can reduce part of the water flow impact force to protect the inner submarine cable fixing device 1 from being impacted by the water flow, thereby protecting the submarine cable.

[0043] Furthermore, the present invention also provides a protection method based on the above-mentioned submarine cable protection device, comprising the following steps:

[0044] S1: Determine the installation position of the submarine cable, splice and connect a plurality of the submarine cable protection units, and fix and lay the submarine cable in the arc-shaped fixing portion 11 after the splicing is completed;

[0045] S2: Throwing stones into the stabilizing part 12 of the spliced ​​submarine cable protection device;

[0046] S3: Repeat the above steps to perform multi-stage splicing and riprap to secure the entire submarine cable.

[0047] In the submarine cable protection method of the above-mentioned submarine cable protection device, a plurality of the submarine cable protection units are spliced ​​in sequence to form the submarine cable protection device, which not only fixes the submarine cable but also plays an anti-scouring protection role and can increase the stability of the submarine cable protection device. Stones or other fillers are thrown into the stabilizing portion 12 of the spliced ​​submarine cable protection device to increase the weight of the submarine cable protection device itself so as to fix the entire submarine cable protection device to the seabed. The submarine cable is doubly protected from scouring and can exert a protective effect for a long time without being knocked down by the water flow. The self-weight and structure of the device can ensure that it is fixed in the ocean current for a long time.

[0048] It should be understood that the above description of the specific embodiments of the present invention is only for illustrating the technical route and features of the present invention, and its purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, but the present invention is not limited to the above specific implementation methods. Any changes or modifications made within the scope of the claims of the present invention should be included in the protection scope of the present invention.

Claims

1. A submarine cable protection device, characterized in that: A submarine cable protection unit, wherein a plurality of the submarine cable protection units are sequentially spliced ​​to form the submarine cable protection device, wherein the submarine cable protection unit comprises an inner submarine cable fixing device (1), an elastic connecting piece (2) and an outer protective device (3), wherein the inner submarine cable fixing device (1) comprises an arc-shaped fixing portion (11) and a stabilizing portion (12); the arc-shaped fixing portion (11) is arranged at the inner center of the stabilizing portion (12), the arc-shaped fixing portion (11) is used to fix and install the submarine cable, and the arc-shaped fixing portion (11) and the stabilizing portion (12) are connected to form an integral structure, and the stabilizing portion (12) of the inner submarine cable fixing device (1) is connected to the outer protective device (3) via the elastic connecting piece (2).

2. The submarine cable protection device according to claim 1, characterized in that: The stabilizing portion (12) comprises a top plate (121), a first side plate (122) and a second side plate (123); the first side plate (122) and the second side plate (123) are respectively arranged on two sides of the top plate (121); the first side plate (122) and the second side plate (123) are arranged obliquely; the top plate (121) and the first side plate (122) and the second side plate (123) form a trapezoidal structure.

3. The submarine cable protection device according to claim 2, characterized in that: The arc-shaped fixing portion (11) comprises a first arc-shaped portion (111), a second arc-shaped portion (112) and a third arc-shaped portion (113); the first arc-shaped portion (111) is connected to the top plate (121); the second arc-shaped portion (112) is connected to an end portion of the first side plate (122); and the third arc-shaped portion (113) is connected to an end portion of the second side plate (123).

4. The submarine cable protection device according to claim 3, characterized in that: A central through hole (13) is provided at the connection between the top plate (121) and the first arc-shaped portion (111).

5. The submarine cable protection device according to claim 1, characterized in that: One end of the stabilizing portion (12) is provided with an inner connecting piece (14), and the other end of the stabilizing portion (12) is provided with an outer connecting piece (15); the inner connecting piece (14) of the stabilizing portion (12) can be inserted into the outer connecting piece (15) of an adjacent stabilizing portion (12), and the two are fixedly connected by bolts.

6. The submarine cable protection device according to claim 1, characterized in that: The outer layer protection device (3) comprises a transverse top plate (31) and an oblique guard plate (32), wherein the oblique guard plates (32) are provided on both sides of the transverse top plate (31), the oblique guard plates (32) are hinged to the transverse top plate (31), the two oblique guard plates (32) are arranged at an angle, and the two oblique guard plates (32) are connected to the stabilizing portion (12) via the elastic connecting member (2).

7. The submarine cable protection device according to claim 6, characterized in that: One end of the oblique guard plate (32) is provided with an inner connecting portion (321), and the other end of the oblique guard plate (32) is provided with an outer connecting portion (322). The inner connecting portion (321) of the oblique guard plate (32) can be inserted into the outer connecting portion (322) of the adjacent oblique guard plate (32), and the two are fixedly connected by bolts.

8. The submarine cable protection device according to claim 1, characterized in that: The submarine cable protection unit comprises a plurality of elastic connectors (2), and the inner submarine cable fixing device (1) is connected to the outer protection device (3) via the plurality of elastic connectors (2).

9. A protection method for a submarine cable protection device according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: Determine the installation position of the submarine cable, splice and connect a plurality of the submarine cable protection units, and fix and lay the submarine cable in the arc-shaped fixing part (11) after the splicing is completed; S2: Throwing stones into the stabilizing part (12) of the spliced ​​submarine cable protection device; S3: Repeat the above steps to perform multi-stage splicing and riprap to secure the entire submarine cable.

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