Wind power submarine cable protection system and its installation method

Abstract

This invention discloses a wind power submarine cable protection system and its installation method, relating to the field of submarine cable protection technology. The wind power submarine cable protection system includes: a casing for being fitted onto the target submarine cable segment; a current-resistant base for being fixedly installed around the target submarine cable segment; and a suspension cable, one end of which is connected to the casing and the other end of which is connected to the current-resistant base. The wind power submarine cable protection system disclosed in this invention can solve the technical problem that submarine cables currently used for wind power platforms are prone to premature breakage and damage under ocean currents, resulting in high operation and maintenance costs for offshore wind power.

Description

Technical Field

[0001] This invention relates to the field of submarine cable protection technology, specifically to a wind power submarine cable protection system and its installation method. Background Technology

[0002] Wind power is one of the most technologically mature, scalable, and commercially viable renewable energy generation methods. In recent years, the focus of the wind power industry has been gradually shifting from onshore to offshore. Offshore wind farms generally consist of a fixed wind turbine platform foundation, wind turbine generators, submarine cables, and a substation. The wind turbine generators are supported by the fixed wind turbine platform foundation and capture wind energy at high altitude. The submarine cables transmit the electricity generated by the wind turbine generators to the onshore control center and ultimately connect to the system substation.

[0003] The presence of steel pipe piles and submarine cable protection pipes on the foundation of wind turbine platforms alters the original flow pattern of the ocean currents in the local area. This generates high-intensity water turbulence and vortex systems around them. The combined effect of these factors erodes the silt and silty soil on the seabed surface near the wind turbine platform foundation, which has poor erosion resistance. This leaves the submarine cable sections near the wind turbine platform foundation that do not enter the seabed in a suspended and swaying state. The interaction between waves, tidal currents, and ocean currents with the submarine cable sections causes external mechanical wear and cyclic bending, leading to premature breakage and damage of the submarine cables. As a result, the operation and maintenance costs of offshore wind power remain high. Summary of the Invention

[0004] The purpose of this invention is to provide a wind power submarine cable protection system, which aims to solve the technical problem that submarine cables used for wind power platforms are prone to premature breakage and damage under the action of ocean currents, resulting in high operation and maintenance costs for offshore wind power.

[0005] To achieve the above objectives, the present invention provides a wind power submarine cable protection system, the wind power submarine cable protection system comprising:

[0006] A protective sleeve is used to be fitted onto the target submarine cable section;

[0007] A flow-resistant base is used to fix the target submarine cable segment in place.

[0008] A suspension cable, one end of which is connected to the protective casing, and the other end of which is connected to the anti-flow base.

[0009] Furthermore, the protective casing includes an inner cylinder, an outer cylinder, and an elastic damping element; the inner cylinder is used to be sleeved on the target submarine cable segment; the outer cylinder is arranged around the inner cylinder, and a first pull ring is provided on the outer cylinder, the first pull ring being connected to one end of the suspension cable; the elastic damping element is disposed between the outer cylinder and the inner cylinder, and the elastic damping element is respectively attached to the inner wall of the outer cylinder and the outer wall of the inner cylinder.

[0010] Furthermore, there are multiple anti-current bases, each being a reinforced concrete structure. Each anti-current base includes a base, uprights, buttresses, and a top plate. Multiple bases are used to fix the bases around the target submarine cable segment. The uprights are vertically mounted on the bases, and a second pull ring is provided on one side of the upright facing the target submarine cable segment. At least one of the second pull rings is connected to the other end of the suspension cable. The buttresses are in the shape of a right-angled trapezoid, with their vertical sidewalls connected to the side of the upright facing away from the target submarine cable segment, and their lower sidewalls connected to the bases. The lower side of the top plate is connected to the top of the uprights and the upper sidewall of the buttresses.

[0011] Furthermore, the outer wall of the inner cylinder is provided with a first reinforcing rib.

[0012] Furthermore, the outer wall of the outer cylinder is provided with a second reinforcing rib.

[0013] Furthermore, the inner cylinder includes a first inner fan ring, a second inner fan ring, and a first threaded connector; the first inner fan ring and the second inner fan ring are spliced ​​together to form a first ring body for fitting the target submarine cable segment; the first threaded connector is locked at the connection between the first inner fan ring and the second inner fan ring.

[0014] Furthermore, the outer cylinder includes a first outer fan ring, a second outer fan ring, and a second threaded connector; the first outer fan ring and the second outer fan ring are spliced ​​together to form a second ring body surrounding the inner cylinder; the second threaded connector is locked at the connection between the first outer fan ring and the second outer fan ring.

[0015] Furthermore, a buffer pad is attached to the inner wall of the inner cylinder, and the buffer pad is used to fit the target submarine cable segment.

[0016] Furthermore, a damping cone is protruding from the outer wall of the outer cylinder.

[0017] Furthermore, the elastic damping element includes annular metal cylinder assemblies and a damping energy-absorbing layer; there are multiple annular metal cylinder assemblies, which are distributed along the axial direction of the inner cylinder; each annular metal cylinder assembly includes multiple metal cylinder bodies, and the multiple metal cylinder bodies of each annular metal cylinder assembly are distributed along the circumference of the inner cylinder; the outer wall of each metal cylinder body is respectively attached to the inner wall of the outer cylinder and the outer wall of the inner cylinder; the damping energy-absorbing layer is attached to the inner wall of the metal cylinder body.

[0018] Furthermore, the damping cone includes multiple cone groups, which are distributed along the axial direction of the outer cylinder; each cone group includes multiple cone bodies distributed circumferentially along the outer cylinder.

[0019] With the central axis of the outer cylinder as the center, each of the cone groups deflects a preset central angle relative to the adjacent cone group.

[0020] Furthermore, the outer wall of the outer cylinder is covered with a damping band, which is in the form of a cross mesh, and multiple grid points of the damping band are connected one-to-one to multiple cone bodies.

[0021] Furthermore, the cone body includes a base frustum, a cylindrical portion, and a top frustum; wherein:

[0022] The bottom surface of the base frustum is adhered to the outer wall of the outer cylinder, one side end face of the cylindrical part is connected to the top surface of the base frustum, and the bottom surface of the top frustum is connected to the other side end face of the cylindrical part.

[0023] The grid points of the damping band adhere to the junction between the frustum portion and the cylindrical portion of the base.

[0024] Furthermore, the base is provided with a plurality of first weight-reducing through holes; the side of the base facing the target submarine cable segment has a first inclined portion, and the side of the base away from the target submarine cable segment has a second inclined portion; the first inclined portion is inclined upward from the direction away from the target submarine cable segment, and the second inclined portion is inclined upward from the direction close to the target submarine cable segment.

[0025] Furthermore, the upright plate has a lower plate body and an upper plate body, the lower plate body being located below the second pull ring and the upper plate body being located above the second pull ring; the lower plate body has a horizontally arranged first flow hole, and the permeability of the lower plate body is 25~35%; the upper plate body has an inclinedly arranged second flow hole, the end of the second flow hole near the target submarine cable segment is higher than the end of the second flow hole away from the target submarine cable segment, and the permeability of the upper plate body is 45~55%.

[0026] Furthermore, the top plate is provided with multiple second weight-reducing through holes; the edge of the top plate facing away from the target submarine cable segment is provided with a first serration.

[0027] Furthermore, the suspension cable includes a net body, a first cable body, and a second cable body; wherein:

[0028] The net body is in the form of a cross mesh, and the net body has a first side and a second side opposite to each other; one end of the first cable body is led out from the cable junction point of the first side, and the other end of the first cable body is connected to the protective cylinder; one end of the second cable body is led out from the cable junction point of the second side, and the other end of the second cable body is connected to the anti-flow base.

[0029] Correspondingly, the present invention also proposes an installation method for a wind power submarine cable protection system, used to install the aforementioned wind power submarine cable protection system, the installation method comprising the following steps:

[0030] Calculate the natural frequency of the target submarine cable segment;

[0031] The natural frequency of the casing is adjusted so that the difference between the natural frequency of the casing and the natural frequency of the target submarine cable segment is less than a preset frequency threshold.

[0032] The multiple casings are split into two parts, and the two parts of the casing are hoisted underwater to be combined and installed on the target submarine cable segment.

[0033] Arrange 3-4 anti-current bases sequentially along the extension direction of the target submarine cable segment and fix them to one side of the target submarine cable segment; arrange 3-4 anti-current bases sequentially along the extension direction of the target submarine cable segment and fix them to the other side of the target submarine cable segment; arrange 2-3 anti-current bases sequentially along a first direction and fix them to the side of the entry point away from the target submarine cable segment, wherein the first direction is perpendicular to the extension direction of the target submarine cable segment, and the entry point is the position where the target submarine cable segment enters the seabed;

[0034] The suspension cable is laid out and tensioned underwater; one end of the tensioned suspension cable is connected to one of the multiple protective sleeves, and the other end of the tensioned suspension cable is connected to the anti-current bases located on both sides of the target submarine cable segment.

[0035] Compared with the prior art, the beneficial effects of the present invention are:

[0036] The wind power submarine cable protection system proposed in this invention involves installing a protective sleeve on the target submarine cable segment and fixing a current-resistant base around it. The sleeve and the current-resistant base are then connected by suspension cables. When the sleeve experiences vortex-induced vibration due to ocean current impact, it will resonate with the target submarine cable segment, which has a similar natural frequency, suppressing the opposing vibration of the target cable segment and thus achieving resonant vibration reduction. The current-resistant base provides a shielding effect on the target cable segment, reducing the water flow velocity in the area behind the base (i.e., the side of the base facing away from the target cable segment) and increasing the static pressure in that area, preventing seabed sediment from being swept up and eroded by the current. The suspension cables tension and pull the sleeve to the current-resistant base, effectively reducing irregular vibrations of the sleeve under the influence of water flow, further enhancing the vibration reduction effect on the target cable segment. Based on the structure of the aforementioned casing, anti-current base and suspension cable, the problem of premature breakage and damage of the target submarine cable section under vortex-induced vibration is solved, the operation and maintenance cost of offshore wind power is reduced, and the safety of offshore wind power platforms is improved. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0038] Figure 1 This is a top view schematic diagram of an embodiment of the wind power submarine cable protection system of the present invention;

[0039] Figure 2 This is a schematic diagram of the overall front view of an embodiment of the wind power submarine cable protection system of the present invention;

[0040] Figure 3 This is a schematic side view of an embodiment of the wind power submarine cable protection system of the present invention;

[0041] Figure 4 This is a first-view cross-sectional structural diagram of the casing in one embodiment of the wind power submarine cable protection system of the present invention;

[0042] Figure 5 This is a partial structural diagram of the casing from a second perspective in one embodiment of the wind power submarine cable protection system of the present invention;

[0043] Figure 6 This is a schematic diagram of the overall structure of the protective sleeve in one embodiment of the wind power submarine cable protection system of the present invention;

[0044] Figure 7 This is a schematic diagram of the structure of the damping cone in one embodiment of the wind power submarine cable protection system of the present invention;

[0045] Figure 8 This is a schematic diagram of the suspension cable structure in one embodiment of the wind power submarine cable protection system of the present invention;

[0046] Figure 9 This is a side view of the anti-current base structure in one embodiment of the wind power submarine cable protection system of the present invention;

[0047] Figure 10 This is a rear view schematic diagram of the anti-current base in one embodiment of the wind power submarine cable protection system of the present invention;

[0048] Figure 11 This is a front view schematic diagram of the anti-current base in one embodiment of the wind power submarine cable protection system of the present invention;

[0049] Figure 12 This is a top view of the anti-current base in one embodiment of the wind power submarine cable protection system of the present invention.

[0050] Explanation of icon numbers:

[0051] 1. Casing;

[0052] 11. Inner cylinder; 12. Outer cylinder; 13. Elastic damping component; 14. First pull ring; 15. Damping cone; 16. Damping band;

[0053] 111. Buffer pad; 112. First reinforcing rib; 113. First threaded connector; 121. Second reinforcing rib; 122. Second threaded connector; 131. Damping energy absorption layer; 151. Base frustum; 152. Cylindrical portion; 153. Top frustum;

[0054] 1521, First through hole; 1522, Second through hole;

[0055] 2. Flow-proof base;

[0056] 21. Base; 22. Vertical plate; 23. Buttress; 24. Top plate; 25. Second pull ring;

[0057] 211. First weight-reducing through hole; 212. First inclined portion; 213. Second inclined portion; 221. First through hole; 222. Second through hole; 241. Second weight-reducing through hole; 242. First serration;

[0058] 3. Suspension cable;

[0059] 31. Net body section; 32. First cable body section; 33. Second cable body section;

[0060] 4. Target submarine cable section;

[0061] 5. Wind power platform.

[0062] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0063] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0064] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0065] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0066] Research has revealed that vortex-induced vibration (VIV) is the primary cause of repeated vibrations and wear damage in submarine cables. When water flows towards a cylinder, high pressure at the cylinder's leading edge forces the water to pass through both sides, creating a boundary layer flow. At the widest part of the cylinder, the boundary layer flow separates from the cylinder's two side surfaces, generating two shear layers. The shear layer in contact with the cylinder's surface moves slower than the outermost shear layer in the free flow, thus rotating into the wake and stacking together to form a symmetrical discrete vortex. As the Reynolds number of the water flow increases, this vortex detaches, forming a periodic staggered wake vortex street. The vortex detachment generates lift and drag on the cylinder. The lift causes the cylinder to vibrate perpendicular to the water flow direction at a frequency equal to the vortex detachment frequency, while the drag causes the cylinder to vibrate in the water flow direction at twice the vortex detachment frequency. These vibrations of the cylinder caused by the vortex detachment process are called vortex-induced vibration (VIV). Cylindrical vibrations can alter the vortex shedding process, causing the vortex shedding frequency to align with the cylinder's vibration frequency—a phenomenon known as lock-in. This lock-in increases vortex intensity, alters the phase, sequence, and mode of vortices in the wake, and increases the cylinder's average drag. When the vortex shedding frequency approaches the cylinder's structural frequency, the structure oscillates at extremely high amplitudes and bears high fatigue loads, leading to structural fatigue failure. Therefore, it is necessary to reduce the amplitude and drag of vortex-induced vibrations by improving the structural design or altering the surrounding flow field.

[0067] Based on the above findings, this application proposes a wind power submarine cable protection system, as detailed in the following embodiments.

[0068] Example 1

[0069] Please see Figures 1 to 3 A wind power submarine cable protection system, comprising:

[0070] The protective sleeve 1 is used to be fitted onto the target submarine cable segment 4; the target submarine cable segment 4 is the suspended part of the submarine cable led out from the wind power platform 5 that is underwater and has not entered the seabed.

[0071] Anti-current base 2 is used to fix the target submarine cable segment 4 around it;

[0072] Suspension cable 3, one end of which is connected to the casing 1, and the other end of which is connected to the anti-flow base 2.

[0073] The natural frequency of the casing 1 can be set according to the measured natural frequency of the target submarine cable segment 4, so that the natural frequency of the casing 1 is equal to or approximately similar to the natural frequency of the target submarine cable segment 4. When the casing 1 is subjected to vortex-induced vibration due to the impact of ocean currents, the casing 1 drives the target submarine cable segment 4 to vibrate together. The inertial force generated by the relative motion of the target submarine cable segment 4 acts on the casing 1. At this time, the target submarine cable segment 4 and the casing 1 resonate, which greatly reduces the vibration amplitude and frequency of the casing 1. At the same time, the opposing vibration motion of the target submarine cable segment 4 is also strongly suppressed by the casing 1, thereby realizing the resonant vibration reduction of the target submarine cable segment 4.

[0074] The anti-current base 2 can be multiple reinforced concrete structures with a certain height and fixed to the seabed. Multiple anti-current bases 2 set around the target submarine cable segment 4 can form a shielding effect on the target submarine cable segment 4, which can reduce the water flow velocity in the area behind the anti-current base 2 (i.e. the side of the anti-current base 2 facing away from the target submarine cable segment 4), increase the static pressure in the area behind the anti-current base 2, and prevent seabed sediment from being swept up by the water flow and eroding the target submarine cable segment 4.

[0075] The suspension cable 3 can be a tensionable rope braided structure made of elastic material. By tensioning and pulling the casing 1 to the anti-current base 2 through the suspension cable 3, the irregular vibration of the casing 1 under the action of water flow can be effectively reduced, thereby further enhancing the vibration reduction effect on the target submarine cable section 4.

[0076] Therefore, the wind power submarine cable protection system provided in this embodiment involves installing a protective sleeve 1 on the target submarine cable segment 4 and fixing a current-blocking base 2 around the target submarine cable segment 4. The protective sleeve 1 and the current-blocking base 2 are then connected by a suspension cable 3. In this way, when the protective sleeve 1 is impacted by the ocean current and undergoes vortex-induced vibration, it will resonate with the target submarine cable segment 4, which has a similar natural frequency, thus suppressing the opposing vibration of the target submarine cable segment 4 and achieving resonant vibration reduction for the target submarine cable segment 4. The current-blocking base 2 can form a shielding effect on the target submarine cable segment 4, reducing the water flow velocity in the area behind the current-blocking base 2 (i.e., the side of the current-blocking base 2 facing away from the target submarine cable segment 4), increasing the static pressure in the area behind the current-blocking base 2, and preventing seabed sediment from being swept up by the water flow and eroding the target submarine cable segment 4. By tensioning and pulling the protective sleeve 1 onto the current-blocking base 2 with the suspension cable 3, the irregular vibration of the protective sleeve 1 under the action of the water flow can be effectively reduced, thereby further enhancing the vibration reduction effect on the target submarine cable segment 4. Based on the structure of the above-mentioned casing 1, anti-current base 2 and suspension cable 3, the problem of premature breakage and damage of the target submarine cable section 4 under vortex-induced vibration is solved, the operation and maintenance cost of offshore wind power is reduced, and the safety of offshore wind power platform 5 is improved.

[0077] Example 2

[0078] Please see Figures 4 to 6 The casing 1 includes an inner cylinder 11, an outer cylinder 12, an elastic damping element 13, a damping cone 15, and a damping band 16. Both the inner cylinder 11 and the outer cylinder 12 are made of corrosion-resistant metal material. Both the inner cylinder 11 and the outer cylinder 12 are composed of two halves (i.e., the inner cylinder 11 is divided into a first inner fan ring and a second inner fan ring, and the outer cylinder 12 is divided into a first outer fan ring and a second outer fan ring) for easy installation. The first inner fan ring and the second inner fan ring are connected by a first threaded connector 113 to form a complete annular inner cylinder 11. The first outer fan ring and the second outer fan ring are connected by a second threaded connector 113. Threaded connectors 122 are used to form a complete annular outer cylinder 12. The axial length of both the inner cylinder 11 and the outer cylinder 12 is 1-1.5m, and the thickness of both is 5-7mm. Eight first reinforcing ribs 112 are evenly distributed circumferentially on the outer wall of the inner cylinder 11, and eight second reinforcing ribs 121 are also evenly distributed circumferentially on the outer wall of the outer cylinder 12. The height of the first reinforcing ribs 112 is 22-25mm, and the thickness is 2-3mm. The height of the second reinforcing ribs 121 is 12-15mm, and the thickness is 2-3mm. Four semi-circular first pull rings 14 are evenly distributed circumferentially on the outer wall of the outer cylinder 12 near the first end, and four semi-circular first pull rings 14 are evenly distributed circumferentially on the outer wall of the outer cylinder 12 near the second end. The cross-sectional diameter of the first pull rings 14 is 10-12mm, and the first pull rings 14 are used to connect one end of the suspension cable 3.

[0079] The inner wall of the inner cylinder 11 is uniformly covered with a buffer pad 111, which is made of elastic materials such as epoxy resin and has a thickness of approximately 10 mm. The inner cylinder 11 and the outer cylinder 12 are connected by multiple elastic damping elements 13, while the inner cylinder 11 and the outer cylinder 12 are rigidly connected to the elastic damping elements 13 respectively. Approximately seven cone groups (each cone group is a group of damping cones 15 obtained by grouping damping cones 15, and each cone group includes several cone bodies) are adhered to the outer wall of the outer cylinder 12. The multiple cone groups are arranged at equal intervals with an axial distance of approximately 134 mm. Each cone group includes four cone bodies evenly distributed along the circumference, and the central angles of two adjacent cone groups differ by 45°, so that the cone bodies are staggered on the outer wall of the outer cylinder 12. Figure 6 As shown, each cone body is connected by a damping band 16, which forms a diamond-shaped mesh structure covering the outer wall of the outer cylinder 12.

[0080] Example 3

[0081] Please see Figure 3 and Figure 4 The elastic damping element 13 includes metal cylinder assemblies and a damping energy-absorbing layer 131. Eight to ten metal cylinder assemblies are arranged along the axis between the outer wall of the inner cylinder 11 and the inner wall of the outer cylinder 12, with an axial spacing of 45 to 55 mm between each assembly. Each metal cylinder assembly includes eight metal cylinder bodies evenly distributed circumferentially. The metal cylinder bodies are elliptical in shape, with a height of 48 to 52 mm, and the major axis of the elliptical cross-section is 100 to 110 mm, and the minor axis is 85 to 90 mm. The damping energy-absorbing layer 131 is adhered to the inner wall of each metal cylinder body. The damping energy-absorbing layer 131 is made of a high-damping-ratio elastic energy-absorbing material such as polyurethane, and its thickness is 10 to 15 mm.

[0082] Example 4

[0083] Please see Figure 7The cone body is made of elastic damping materials such as polyurethane. The bottom diameter of the base frustum 151 is about 134 mm, the top diameter of the base frustum 151 is about 76 mm, the diameter of the cylindrical part 152 is the same as the top diameter of the base frustum 151 and the bottom diameter of the top frustum 153, and the top diameter of the top frustum 153 is about 19 mm. Each cylindrical part 152 has a first through hole 1521 and a second through hole 1522 in a cross shape at its center. The central axis of the first through hole 1521 is parallel to the axial direction of the outer cylinder 12, and the central axis of the second through hole 1522 is perpendicular to the radial direction of the outer cylinder 12. The diameter of the first through hole 1521 and the second through hole 1522 is 30 mm. By setting the first through hole 1521 and the second through hole 1522, on the one hand, the resistance of water flow through the cylindrical part 152 can be reduced, allowing it to pass through the damping cone 15 more smoothly; on the other hand, it is equivalent to forming a jet that is ejected from the back flow surface of the cylindrical part 152, which disrupts the formation of coherent vortices in the wake of the damping cone 15 itself, thus avoiding the occurrence of vortex-induced vibration of the damping cone 15 itself.

[0084] Example 5

[0085] Please see Figures 4 to 6 The damping band 16 is made of elastic damping material such as polyurethane. The width of the damping band 16 is 70~75mm and the thickness is about 5mm. The damping band 16 is adhered and connected to the junction of the base frustum 151 and the cylindrical part 152 of each cone body, and is arranged in a cross mesh pattern to surround the outer cylinder 12.

[0086] Optionally, when both the inner cylinder 11 and the outer cylinder 12 are composed of two parts that are split in half (i.e., the inner cylinder 11 is divided into a first inner fan ring and a second inner fan ring, and the outer cylinder 12 is divided into a first outer fan ring and a second outer fan ring), the damping band 16 covering the cone body located at the split point can be divided into upper and lower layers. The lower damping band 16 is adhered to the cone body, while the upper damping band 16 needs to be adhered after the target submarine cable segment 4 is fully installed in both parts of the inner cylinder 11 and the outer cylinder 12. This ensures a stable adhesion between the damping band 16 and the outer cylinder 12 while preventing the loss of the two parts of the inner cylinder 11 and the outer cylinder 12.

[0087] In the above embodiment, the inner cylinder 11 encloses the target submarine cable segment 4 to form a whole, and the target submarine cable segment 4, the outer cylinder 12, and the elastic damping element 13 together constitute a tuned mass damper. When the outer cylinder 12 is impacted by the ocean current and undergoes vortex-induced vibration, the outer cylinder 12 drives the target submarine cable segment 4 to vibrate together through the elastic damping element 13. The inertial force generated by the relative motion of the target submarine cable segment 4 reacts on the outer cylinder 12. At this time, the target submarine cable segment 4 and the outer cylinder 12 resonate, causing the vibration amplitude and frequency of the outer cylinder 12 to be greatly reduced. At the same time, the opposing vibration motion of the target submarine cable segment 4 is also strongly suppressed by the outer cylinder 12. Furthermore, the damping energy absorption layer 131 in the elastic damping element 13 converts the kinetic energy of the relative motion between the target submarine cable segment 4 and the outer cylinder 12 into the internal energy of the damping material. Finally, the internal energy is dissipated into the water by increasing the temperature, thereby achieving a large amount of energy absorption and further reducing the vibration of the target submarine cable segment 4.

[0088] Before installation, the stiffness and damping ratio of the elastic damping element 13 can be calculated and adjusted. This allows the tuned mass damper to achieve effective resonance and damping vibration reduction even when the water flow excitation load is close to or even significantly deviates from the natural frequency of the target submarine cable segment 4.

[0089] The inner cylinder 11 is tightly wrapped with the target submarine cable segment 4 through the buffer pad 111, so that while the protective sleeve 1 is firmly connected to the target submarine cable segment 4, it can prevent relative rotation between the inner cylinder 11 and the target submarine cable segment 4 and friction damage to the surface of the target submarine cable segment 4, thereby improving the durability of the target submarine cable segment 4 after the protective sleeve 1 is installed.

[0090] The numerous staggered damping cones 15 (specifically, individual cone bodies) on the surface of the outer cylinder 12 can exert a three-dimensional destructive effect on the vortex wake of the outer cylinder 12, hindering the formation of coherent vortices and generating a large number of dispersed vortices. This prevents the wake vortices of the outer cylinder 12 from being released in a regular manner, thus avoiding vortex-induced vibrations of specific frequencies and amplitudes caused by the regular release of wake vortices from the outer cylinder 12. In addition, the multi-stage stepped variable cross-section frustum structure of the cone body can also destroy the generation of coherent vortices caused by its own structure at the cone scale. The elastic damping material of the cone body itself will also convert vibration energy into internal energy during its own vibration, suppressing small vortex-induced vibrations in the radial direction of the cone, thereby further reducing the adverse additional effects of vortex-induced vibration on the vibration of the target submarine cable segment 4.

[0091] The damping band 16 forms a perforated shield, which will produce a wrapping and covering effect, disrupting the formation of the regular vortex wake caused by the outer cylinder 12. At the same time, a gap is formed between the perforated shield and the outer cylinder 12. Water flows into the perforated shield and through the gap, eventually flowing out through the perforated shield. This creates a sandwich flow between the perforated shield and the outer cylinder 12, forming a buffer zone between the high-velocity region outside the perforated shield and the low-velocity region inside the perforated shield. This is equivalent to a jet being ejected from the cylindrical structure. This enhances the mixing of the sandwich flow and the free shear layer, increases the flow velocity in the low-velocity region on the back surface of the cylindrical structure, increases the pressure on the back surface of the cylindrical structure, thereby increasing the vortex size, effectively delaying the vortex shearing position, disrupting the formation of the regular vortex wake, and thus significantly reducing the pulsating lift that causes vortex-induced vibration. In addition, the damping bands 16 arranged in a cross-shaped mesh enhance the integrity of the dispersed cone bodies. By utilizing the entire cone body and the damping bands 16 as a whole to absorb the vibration energy of the local damping structure, the irregular vibrations of each cone body cancel each other out. The mesh structure of the damping bands 16 itself also increases hydrodynamic damping, thereby further improving the vibration suppression efficiency.

[0092] Example 6

[0093] Please see Figures 1 to 3 as well as Figures 9 to 12 Multiple anti-flow bases 2 are included. Each anti-flow base 2 is a reinforced concrete structure, comprising a base 21, uprights 22, buttresses 23, and a top plate 24. The base 21 is a frame structure, divided into multiple first weight-reducing through holes 211 by multiple main longitudinal beams, multiple secondary longitudinal beams, and multiple transverse beams. The width of the base 21 is 5500-6500mm, and the length is 7000-8000mm. The width of the main longitudinal beams is 280-300mm, and the width of the secondary longitudinal beams and transverse beams is 100-120mm. The first weight-reducing through holes 211... 1. Used to reduce the weight of the anti-flow base 2 itself, so as to reduce material costs and facilitate hoisting and transportation; the base 21 has a first inclined part 212 on the side facing the target submarine cable segment 4, and a second inclined part 213 on the side facing away from the target submarine cable segment 4. The first inclined part 212 is inclined upward from the direction away from the target submarine cable segment 4, and the second inclined part 213 is inclined upward from the direction close to the target submarine cable segment 4. The slope of the first inclined part 212 and the second inclined part 213 is 1:1, and the width of the first inclined part 212 and the second inclined part 213 is 500mm.

[0094] The height of the upright plate 22 is 2400~2600mm, the thickness is 240~260mm, and the length is the same as the width of the base 21. The upright plate 22 has a first flow hole 221 and a second flow hole 222 with a length of 750~800mm and a width of 90~110mm, which are regularly distributed on it. The permeability of the lower plate of the upright plate 22 is 25%~35% (that is, the ratio of the area of ​​the first flow hole 221 to the area of ​​the lower plate is 25~35%), and the first flow hole 221 is horizontally set. The permeability of the upper plate of the upright plate 22 is 45~55% (that is, the ratio of the area of ​​the second flow hole 222 to the area of ​​the upper plate is 45~55%). The second flow hole 222 is inclined, and the end closer to the target submarine cable segment 4 is higher than the end farther away from the target submarine cable segment 4, with an inclination angle of 15°. On one side of the upright plate 22 facing the target submarine cable segment 4, 14 to 16 semi-circular second pull rings 25 are horizontally and equally spaced. The second pull rings 25 are located in the middle of the upright plate 22 and are used to separate the lower plate body and the upper plate body. The second pull rings 25 are made of corrosion-resistant metal material and are used to connect the other end of the suspension cable 3.

[0095] The buttress 23 is a right-angled trapezoidal thick plate structure. The buttress 23 is located above the main longitudinal beam of the base 21. The thickness of the buttress 23 is equal to the width of the main longitudinal beam, and the height of the buttress 23 is equal to the height of the upright plate 22. The upper bottom side length of the buttress 23 is 900~1100mm, and the lower bottom side length of the buttress 23 is 1500~1700mm. The buttress 23 is perpendicularly connected to the upright plate 22. Three to four buttresses 23 are equidistantly arranged along the length of the base 21, and the distance between adjacent buttresses 23 is 1900~2100mm.

[0096] The top plate 24 is perpendicular to the vertical plate 22 and the buttress 23. The width of the top plate 24 is 900~1100mm, and the length of the top plate 24 is equal to the width of the base 21. Two types of second weight-reducing through holes 241 are regularly distributed on the top plate 24. One type of second weight-reducing through hole 241 is 400mm long and 100mm wide, and the other type is 100mm long and 100mm wide. The permeability of the top plate 24 is 45~55% (i.e., the second weight-reducing through holes). The area of ​​241 is 45-55% of the area of ​​the top plate 24. The second weight-reducing through hole 241 is used to reduce the weight of the anti-flow base 2 itself, so as to reduce material costs and facilitate hoisting and transportation. The top plate 24 is provided with a first serration 242 on the side edge near the buttress 23. The groove width of the first serration 242 is 150mm, the tooth height of the first serration 242 is 400mm, and the center distance between the grooves of adjacent first serrations 242 is 700-800mm.

[0097] The low permeability of the overall anti-current base 2 will create turbulence and obstruction of the water flow, resulting in a shielding effect. This can significantly reduce the water flow velocity in the area behind the anti-current base 2 (i.e., the side of the anti-current base 2 facing away from the target submarine cable section 4), increase the static pressure in the area behind the anti-current base 2, and prevent seabed sediment from being swept up by the water flow and eroding the target submarine cable section 4. Furthermore, the second flow passage 222 inclinedly set in the upper plate of the vertical plate 22 will induce the flowing water to be thrown obliquely upward, thereby expanding the low flow velocity area behind the anti-current base 2, greatly reducing the water flow force on the target submarine cable section 4, and also avoiding excessive increase in the pressure on the front surface of the anti-current base 2, reducing the overturning moment on the bottom of the anti-current base 2. The first serration 242 on the top plate 24 can effectively weaken the negative pressure peak behind the anti-current base 2, so that the high pressure area in front of the anti-current base 2 (i.e. the side of the anti-current base 2 facing the target submarine cable section 4) and the low pressure area behind it can be smoothly transitioned, reducing the piping pressure on the seabed surface behind and preventing piping scouring, so as to further protect the target submarine cable section 4.

[0098] Example 7

[0099] Please see Figures 1 to 3 as well as Figure 8 The suspension cable 3 is made of elastic and corrosion-resistant materials such as nylon. The suspension cable 3 includes a net body 31, a first cable body 32, and a second cable body 33. The net body 31 is in the form of a cross mesh and has a first side and a second side. One end of the first cable body 32 is led out from the cable junction point of the first side, and the other end of the first cable body 32 is connected to the protective cylinder 1. One end of the second cable body 33 is led out from the cable junction point of the second side, and the other end of the second cable body 33 is connected to the anti-flow base 2.

[0100] The net section 31 has a total length of 9800~10000mm and a width of 2650~2850mm. It is made of interlaced cables. The mesh of the net section 31 is a square with a side length of 380mm. The first cable section 32 and the second cable section 33 extend from the intersection of the cables on the long side of the net section 31. Each long side of the net section 31 extends 16~20 first cable sections 32 or second cable sections 33. The suspension cable 3 formed by the net section 31, the first cable section 32, and the second cable section 33 is pre-tensioned and connected to the second pull ring 25 of the anti-flow base 2 and the first pull ring 14 of the protective cylinder 1.

[0101] Optionally, when connected to the first pull ring 14 and the second pull ring 25, adjacent first cable portion 32 and second cable portion 33 can both be Figure 1 and Figure 8 The connections are staggered in pairs as shown. For any one sleeve 1, four first pull rings 14 are arranged circumferentially near the first end, and four first pull rings 14 are also arranged circumferentially near the second end; Figure 3 As shown in the example, two first pull rings 14 are respectively provided on the left and right sides of the first end. The two pull rings on the left are connected to a net body 31 through a first cable body 32 (the end of the first cable body 32 used to connect the first pull ring 14 can branch into two cables to connect to the upper and lower first pull rings 14 respectively). The two pull rings on the right are connected to another net body 31 through another first cable body 32 (the end of the first cable body 32 used to connect the first pull ring 14 can branch into two cables to connect to the upper and lower first pull rings 14 respectively). Similarly, two first pull rings 14 are respectively provided on the left and right sides at the second end. The two pull rings on the left are connected to a net body 31 through a first cable body 32 (the end of the first cable body 32 used to connect the first pull ring 14 can branch into two cables to connect to the upper and lower first pull rings 14 respectively). The two pull rings on the right are connected to another net body 31 through another first cable body 32 (the end of the first cable body 32 used to connect the first pull ring 14 can branch into two cables to connect to the upper and lower first pull rings 14 respectively). Refer to Figure 1 The top-down view and Figure 3 The side view shown shows that the first cable portion 32 for connecting the first pull ring 14 on the left side of the first end of the casing 1 and the first cable portion 32 for connecting the first pull ring 14 on the left side of the second end of the casing 1 are tensioned in a V-shape on the horizontal plane. The first cable portion 32 for connecting the first pull ring 14 on the right side of the first end of the casing 1 and the first cable portion 32 for connecting the first pull ring 14 on the right side of the second end of the casing 1 are also tensioned in a V-shape on the horizontal plane, which can improve the traction stability of the suspension cable 3.

[0102] By tensioning and pulling the casing 1 onto the anti-flow base 2 with the suspension cable 3, the irregular vibration of the casing 1 under the action of water flow can be effectively reduced; while the interwoven net body 31 in the suspension cable 3 can increase the integrity of each cable body and avoid strong flutter caused by the excessive length of the suspension cable 3 under the action of water flow.

[0103] Correspondingly, this embodiment of the invention also provides a method for installing a wind power submarine cable protection system, used to install the wind power submarine cable protection system in any of the above embodiments. The method for installing the wind power submarine cable protection system includes the following steps:

[0104] S1, calculate the natural frequency of the target submarine cable segment 4; where the natural frequency of the target submarine cable segment 4 is related to the suspension length of the target submarine cable segment 4.

[0105] S2, adjust the natural frequency of the casing 1 so that the difference between the natural frequency of the casing 1 and the natural frequency of the target submarine cable segment 4 is less than a preset frequency threshold; specifically, adjust the stiffness of the elastic damping element 13 to adjust the natural frequency of the outer cylinder 12 so that the natural frequencies of the target submarine cable segment 4 and the outer cylinder 12 are equal or similar, so as to play a resonant vibration reduction role; wherein, the stiffness of the elastic damping element 13 can be adjusted by adjusting the axial height of its metal cylinder body; and the damping ratio of the elastic damping element 13 can be set to 0.1~0.2 by adjusting the thickness of the damping energy absorption layer 131;

[0106] S3, the multiple protective casings 1 are split into two parts, and the two parts of the split protective casings 1 are hoisted to the water to merge the multiple protective casings 1 and install them on the target submarine cable segment 4; this step can correspond to the above-mentioned scheme of dividing the inner cylinder 11 into the first inner fan ring and the second inner fan ring, and dividing the outer cylinder 12 into the first outer fan ring and the second outer fan ring. For details, please refer to the above embodiment, which will not be repeated here.

[0107] S4, arrange 3-4 anti-current bases 2 sequentially along the extension direction of the target submarine cable segment 4 and fix them to one side of the target submarine cable segment 4; arrange 3-4 anti-current bases 2 sequentially along the extension direction of the target submarine cable segment 4 and fix them to the other side of the target submarine cable segment 4; arrange 2-3 anti-current bases 2 sequentially along a first direction and fix them to the side away from the entry point of the target submarine cable segment 4, wherein the first direction is perpendicular to the extension direction of the target submarine cable segment 4, and the entry point is the position where the target submarine cable segment 4 enters the seabed; the anti-current bases 2 after arrangement are as follows: Figure 1 and Figure 2 As shown, at this time, there are 3 anti-current bases 2 arranged horizontally on one side of the target submarine cable segment 4, 3 anti-current bases 2 arranged horizontally on the other side of the target submarine cable segment 4, and 3 anti-current bases 2 arranged vertically on the side away from the suspended part of the target submarine cable segment 4 at the point where the target submarine cable segment 4 enters the seabed.

[0108] S5, underwater, lay out and tension the suspension cable 3; connect one end of the tensioned suspension cable 3 to multiple protective sleeves 1, and connect the other end of the tensioned suspension cable 3 to the current-resistant bases 2 located on both sides of the target submarine cable section 4; after the suspension cable 3 is connected, as shown... Figure 1 As shown.

[0109] Since the installation method of the wind power submarine cable protection system adopts all the technical solutions of all the above-mentioned embodiments of the wind power submarine cable protection system, it has at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0110] It should be noted that other aspects of the wind power submarine cable protection system and its installation method disclosed in this invention can be found in the prior art, and will not be repeated here.

[0111] The above are merely optional embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A wind power submarine cable protection system, characterized in that, The wind power submarine cable protection system includes: A protective sleeve is used to be fitted onto the target submarine cable section; A flow-resistant base is used to fix the target submarine cable segment in place. A suspension cable, one end of which is connected to the protective casing, and the other end of which is connected to the anti-flow base; The protective casing includes an inner cylinder, an outer cylinder, and an elastic damping element; the inner cylinder is used to be sleeved on the target submarine cable segment; the outer cylinder is arranged around the inner cylinder, and a first pull ring is provided on the outer cylinder, the first pull ring being connected to one end of the suspension cable; the elastic damping element is disposed between the outer cylinder and the inner cylinder, and the elastic damping element is respectively in contact with the inner wall of the outer cylinder and the outer wall of the inner cylinder; The anti-current base is a plurality of such bases, each being a reinforced concrete structure. Each anti-current base includes a base, uprights, buttresses, and a top plate. The multiple bases are used to fix the bases around the target submarine cable segment. The uprights are vertically mounted on the bases, and a second pull ring is provided on the side of the upright facing the target submarine cable segment. At least one of the second pull rings is connected to the other end of the suspension cable. The buttresses are in the shape of a right-angled trapezoid, with their vertical sidewalls connected to the side of the upright facing away from the target submarine cable segment, and their lower sidewalls connected to the bases. The lower side of the top plate is connected to the top of the uprights and the upper sidewall of the buttresses. The inner cylinder includes a first inner fan ring, a second inner fan ring, and a first threaded connector; the first inner fan ring and the second inner fan ring are spliced ​​together to form a first ring body for fitting the target submarine cable segment; the first threaded connector is locked at the connection between the first inner fan ring and the second inner fan ring. The outer cylinder includes a first outer fan ring, a second outer fan ring, and a second threaded connector; the first outer fan ring and the second outer fan ring are spliced ​​together to form a second ring body surrounding the inner cylinder; the second threaded connector is locked at the connection between the first outer fan ring and the second outer fan ring.

2. The wind power submarine cable protection system according to claim 1, characterized in that, The outer wall of the inner cylinder is provided with a first reinforcing rib; And / or, the outer wall of the outer cylinder is provided with a second reinforcing rib.

3. The wind power submarine cable protection system according to claim 1, characterized in that, The inner wall of the inner cylinder is attached with a buffer pad, which is used to fit the target submarine cable segment. And / or, the outer wall of the outer cylinder is provided with a damping cone; And / or, the elastic damping element includes an annular metal cylinder assembly and a damping energy-absorbing layer; there are multiple annular metal cylinder assemblies, and the multiple annular metal cylinder assemblies are distributed along the axial direction of the inner cylinder; the annular metal cylinder assembly includes multiple metal cylinder bodies, and the multiple metal cylinder bodies of each annular metal cylinder assembly are distributed along the circumference of the inner cylinder; the outer wall of the metal cylinder body is respectively attached to the inner wall of the outer cylinder and the outer wall of the inner cylinder; the damping energy-absorbing layer is attached to the inner wall of the metal cylinder body.

4. The wind power submarine cable protection system according to claim 3, characterized in that, The damping cone includes multiple cone groups, which are distributed along the axial direction of the outer cylinder; each cone group includes multiple cone bodies distributed circumferentially along the outer cylinder. With the central axis of the outer cylinder as the center, each of the cone groups deflects a preset central angle relative to the adjacent cone group.

5. The wind power submarine cable protection system according to claim 4, characterized in that, The outer wall of the outer cylinder is covered with a damping band, which is in the form of a cross mesh, and multiple grid points of the damping band are connected one-to-one to multiple cone bodies.

6. The wind power submarine cable protection system according to claim 5, characterized in that, The cone-shaped body includes a base frustum, a cylindrical portion, and a top frustum; wherein: The bottom surface of the base frustum is adhered to the outer wall of the outer cylinder, one side end face of the cylindrical part is connected to the top surface of the base frustum, and the bottom surface of the top frustum is connected to the other side end face of the cylindrical part. The grid points of the damping band adhere to the junction between the frustum portion and the cylindrical portion of the base.

7. The wind power submarine cable protection system according to claim 1, characterized in that, The base has multiple first weight-reducing through holes; the base has a first inclined portion on the side facing the target submarine cable segment, and a second inclined portion on the side facing away from the target submarine cable segment; the first inclined portion is inclined upward from the direction away from the target submarine cable segment, and the second inclined portion is inclined upward from the direction close to the target submarine cable segment. And / or, the upright plate has a lower plate body and an upper plate body, the lower plate body being located below the second pull ring and the upper plate body being located above the second pull ring; the lower plate body has a horizontally arranged first flow hole, and the permeability of the lower plate body is 25~35%; the upper plate body has an inclinedly arranged second flow hole, the end of the second flow hole near the target submarine cable segment being higher than the end of the second flow hole away from the target submarine cable segment, and the permeability of the upper plate body is 45~55%; And / or, the top plate is provided with a plurality of second weight-reducing through holes; the edge of the top plate facing away from the target submarine cable segment is provided with a first serration.

8. The wind power submarine cable protection system according to claim 1, characterized in that, The suspension cable includes a net section, a first cable section, and a second cable section; wherein: The net body is in the form of a cross mesh, and the net body has a first side and a second side opposite to each other; one end of the first cable body is led out from the cable junction point of the first side, and the other end of the first cable body is connected to the protective cylinder; one end of the second cable body is led out from the cable junction point of the second side, and the other end of the second cable body is connected to the anti-flow base.

9. A method for installing a wind power submarine cable protection system, used for installing the wind power submarine cable protection system as described in any one of claims 1 to 8, characterized in that, The installation method for the wind power submarine cable protection system includes the following steps: Calculate the natural frequency of the target submarine cable segment; The natural frequency of the casing is adjusted so that the difference between the natural frequency of the casing and the natural frequency of the target submarine cable segment is less than a preset frequency threshold. The multiple casings are split into two parts, and the two parts of the casing are hoisted underwater to be combined and installed on the target submarine cable segment. Arrange 3-4 anti-current bases sequentially along the extension direction of the target submarine cable segment and fix them to one side of the target submarine cable segment; arrange 3-4 anti-current bases sequentially along the extension direction of the target submarine cable segment and fix them to the other side of the target submarine cable segment; arrange 2-3 anti-current bases sequentially along a first direction and fix them to the side of the entry point away from the target submarine cable segment, wherein the first direction is perpendicular to the extension direction of the target submarine cable segment, and the entry point is the position where the target submarine cable segment enters the seabed; The suspension cable is laid out and tensioned underwater; one end of the tensioned suspension cable is connected to one of the multiple protective sleeves, and the other end of the tensioned suspension cable is connected to the anti-current bases located on both sides of the target submarine cable segment.

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