Protective device and submarine cable laying method

Abstract

The present invention discloses a protection device and a method for laying a submarine cable, the protection device includes a rigid guide pipe, a flexible guide pipe and an elastic protection component, the elastic protection component includes a component base, an adjusting member, an elastic member and a connecting member, the component base has a first inner cavity and a first end and a second end opposite to each other, the adjusting member is screwed to the component base, the adjusting member has a connecting end and an adjusting end opposite to each other, the connecting end is located in the first inner cavity, the adjusting member can rotate relative to the component base to adjust the distance between the connecting end and the second end, the adjusting end is located outside the first inner cavity, the elastic member may include but is not limited to a spring, a spring sheet, the elastic member is located in the first inner cavity and is compressed between the connecting end and the second end, the connecting member is connected between an end of the elastic member away from the connecting end and an end of the flexible guide pipe away from the rigid guide pipe. The protection device can protect the submarine cable and keep the submarine cable in a laying posture with a relatively stable bending curvature.

Description

Technical Field

[0001] The present invention relates to the technical field of marine cables, and in particular to a protective device and a method for laying a submarine cable. Background Art

[0002] In order to utilize offshore wind resources to generate electricity, it is necessary to build wind farms at sea and lay cables to the seabed to transmit the wind power generated by the offshore wind farms to land.

[0003] When a submarine cable needs to be laid in a curved manner, the curved portion of the submarine cable is usually placed inside a flexible guide conduit to avoid stress concentration in the cable. However, due to the harsh ocean environment, the bending curvature of the flexible guide conduit and the submarine cable may change due to factors such as water swaying and attachment of marine organisms, causing the submarine cable to be excessively bent, thereby reducing the service life and reliability of the submarine cable. Summary of the Invention

[0004] One object of the present invention is to provide a protection device capable of protecting a submarine cable and maintaining the submarine cable in a laying posture with a relatively stable bending curvature.

[0005] Another object of the present invention is to provide a method for laying a submarine cable, which can use the aforementioned protection device to protect the submarine cable and realize the laying of the submarine cable.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] In a first aspect, a protection device is provided for protecting a submarine cable, the protection device comprising:

[0008] a rigid guide pipe, wherein the interior of the rigid guide pipe is used for passing the submarine cable;

[0009] a flexible guide pipe, the flexible guide pipe being connected to one end of the rigid guide pipe, the interior of the flexible guide pipe being used for passing the submarine cable; and

[0010] 18. The foldable member as claimed in claim 15, wherein the linking member is a pair of linking elements, wherein the linking member is a pair of linking elements. The linking member is a pair of linking elements comprising a first end, a second end, and a second end of the linking member. The linking member is a pair of linking elements comprising a first end, a second end, and a second end of the linking member. The linking member is a pair of linking elements comprising a first end, a second end, and a second end of the linking member.

[0011] As a preferred technical solution of the protective device, the component base includes a main body and a sliding member, the main body having a slide groove and the first end, the sliding member having the second end and the first inner cavity, the sliding member can be slidably matched and connected to the slide groove along the relative direction of the first end and the second end, and the end of the sliding member close to the first end is also provided with a third through hole connected to the first inner cavity, the adjusting member is connected to the main body in an upper limit position along the relative direction of the first end and the second end, the adjusting member is also passed through the third through hole, and the connecting end is threadedly connected to the wall of the first inner cavity.

[0012] As a preferred technical solution of the protective device, the flexible guide pipe includes a main body and a thickened portion, one end of the main body is connected to one end of the rigid guide pipe, and the interior of the main body is used for passing the submarine cable, the thickened portion is arranged around the outer circumference of the main body and is located between the two opposite ends of the main body.

[0013] As a preferred technical solution of the protective device, the thickened portion is provided with a second inner cavity surrounding the outer circumference of the main body portion, and the thickened portion is also provided with a plurality of communicating holes, which are connected to the second inner cavity and pass through the end surface of the thickened portion along the extension direction of the main body portion. Along the extension direction of the main body portion, the second inner cavity is also alternately provided with first baffles and second baffles, the first baffle surrounds and is connected to the outer circumference of the main body portion, and a gap is formed between the first baffle and the thickened portion, the second baffle surrounds the main body portion and is connected to the thickened portion, and a gap is formed between the second baffle and the main body portion.

[0014] As a preferred technical solution of the protective device, the first baffle is an elastic baffle, and / or the second baffle is an elastic baffle.

[0015] As a preferred technical solution of the protective device, a first magnet and a second magnet are also provided in the second inner cavity, the first magnet surrounds and is connected to the outer periphery of the main body, the second magnet surrounds the first magnet at intervals and is connected to the thickened portion, and the magnetic poles of the parts where the first magnet and the second magnet are close to each other are the same.

[0016] As a preferred technical solution of the protective device, the protective device also includes a fixing ring, which is movably sleeved on the end of the flexible guide pipe away from the rigid guide pipe, and the end of the connecting member away from the elastic member is detachably connected to the fixing ring.

[0017] In a second aspect, a method for laying a submarine cable is provided, using the protective device described in the first aspect, the method comprising the following steps:

[0018] Step S1: rotating the adjustment end to adjust the compression amount of the elastic member according to the weight of the submarine cable to be laid;

[0019] Step S2, placing the protection device in the ocean;

[0020] Step S3: inserting the submarine cable into the rigid guide pipe and the flexible guide pipe.

[0021] As a preferred technical solution of the submarine cable laying method, the connector is detachably connected to the flexible guide pipe, and step S2 includes:

[0022] Step S20: placing the rigid guide pipe and the flexible guide pipe in the ocean;

[0023] Step S21: sinking the elastic protection component into the ocean;

[0024] Step S22: Connect the connecting piece to the flexible guide pipe.

[0025] As a preferred technical solution of the submarine cable laying method, before step S2, the submarine cable laying method further includes:

[0026] Step S1a: applying viscous grease to the inner wall surfaces of the rigid guide pipe and the flexible guide pipe.

[0027] The beneficial effects of the present invention are:

[0028] By providing an elastic protection component, the elastic member is compressed between the connecting end and the second end, and the elastic member is connected to the flexible guide pipe through the connecting member, so that when the flexible guide pipe is acted upon by an external force and moves toward the side where the connecting member is located, one end of the flexible guide pipe can compress the elastic member through the connecting member, so that the elastic member applies an elastic restoring force to one end of the flexible guide pipe through the connecting member, thereby helping to maintain the position of the one end of the flexible guide pipe in a relatively stable state.

[0029] In actual use, the end of the flexible guide pipe away from the rigid guide pipe is set on the seabed, and the elastic protection component is suspended on the side of the flexible guide pipe facing the sea surface through a chain. When the end of the flexible guide pipe away from the rigid guide pipe is lifted toward the sea surface, the elastic member applies an elastic force to the end of the flexible guide pipe through the connecting member, so that the end of the flexible guide pipe can be kept more stably in a state of being set on the seabed, thereby keeping the bending curvature of the flexible guide pipe in a relatively stable state, so as to protect the submarine cable passed through the flexible guide pipe and keep the submarine cable in a laying posture with a relatively stable bending curvature, thereby making the service life of the submarine cable longer and the reliability of use better.

[0030] In addition, due to the different overall weights of the submarine cable and the flexible guide pipe, the forces applied to the connecting member when the submarine cable and the flexible guide pipe move under the action of seawater are also different. Therefore, by rotating the adjusting end of the adjusting member, the distance between the connecting end and the second end can be adjusted, and then the amount of compression compressed between the connecting end and the second end can be adjusted, so that the magnitude of the elastic force applied by the elastic member to one end of the flexible guide pipe when one end of the flexible guide pipe is slightly lifted can be adjusted, so that the elastic protection component is suitable for protecting submarine cables and flexible guide pipes with different weights. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0032] Figure 1 It is a schematic structural diagram of the protection device described in the embodiment (the flexible guide pipe is in a bent state).

[0033] Figure 2 Schematic cross-sectional view of the elastic protection component described in the embodiment.

[0034] Figure 3 It is a front view structural schematic diagram of the flexible guide pipe (in a straight state) described in the embodiment.

[0035] Figure 4 It is a schematic cross-sectional structural diagram of the flexible guide pipe (in a straightened state) described in the embodiment.

[0036] Figure 5It is a schematic diagram of the top view of the flexible guide pipe (in a straightened state) described in the embodiment.

[0037] In the picture:

[0038] 1. Protective device;

[0039] 10. Rigid guide pipe;

[0040] 11. Flexible guide tube; 111. Main body; 112. Thickened portion; 1120. Second inner cavity; 1121. Communication hole; 113. First baffle; 114. Second baffle; 115. First magnet; 116. Second magnet;

[0041] 12. Elastic protection assembly; 120. Assembly base; 1201. First end; 1201a. First through hole; 1202. Second end; 1202a. Second through hole; 1203. First inner cavity; 1204. Main body; 1204a. Slide groove; 1204b. Protrusion; 1205. Sliding member; 1205a. Third through hole; 121. Adjusting member; 1210. Connecting end; 1211. Adjusting end; 1212. Limiting member; 122. Elastic member; 123. Connecting member;

[0042] 13. Fixed ring. DETAILED DESCRIPTION

[0043] To make the technical problems solved, the technical solutions adopted, and the technical effects achieved by the present invention more clearly understood, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It is apparent that the described embodiments are only some of the embodiments of the present invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0044] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0045] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0046] like Figure 1 and Figure 2 As shown, the present invention provides a protection device 1 for protecting a submarine cable. The protection device 1 includes a rigid guide pipe 10, a flexible guide pipe 11 and an elastic protection component 12. The interior of the rigid guide pipe 10 is used for threading the submarine cable. The flexible guide pipe 11 is connected to one end of the rigid guide pipe 10. The interior of the flexible guide pipe 11 is used for threading the submarine cable. The elastic protection component 12 includes a component seat 120, an adjusting member 121, an elastic member 122 and a connecting member 123. The component seat 120 has a first end 1201 and a second end 1202 opposite to each other. The component seat 120 also has a first inner cavity 1203 located between the first end 1201 and the second end 1202. The first end 1201 is provided with a first through hole 1201a connected to the first inner cavity 1203, and the second end 1202 is provided with a second through hole 1201a connected to the first inner cavity 1203. Hole 1202a, the adjusting member 121 is screwed on the component base 120 and passes through the first through hole 1201a, the adjusting member 121 has a relative connecting end 1210 and an adjusting end 1211, the connecting end 1210 is located in the first inner cavity 1203, the adjusting member 121 can rotate relative to the component base 120 to adjust the distance between the connecting end 1210 and the second end 1202, the adjusting end 1211 is located outside the first inner cavity 1203, the elastic member 122 may include but is not limited to a spring, a spring sheet, the elastic member 122 is located in the first inner cavity 1203 and is compressed between the connecting end 1210 and the second end 1202, the connecting member 123 can be slidably passed through the second through hole 1202a, and the connecting member 123 is connected between the end of the elastic member 122 away from the connecting end 1210 and the end of the flexible guide pipe 11 away from the rigid guide pipe 10.

[0047] By setting up the elastic protection component 12, the elastic member 122 is compressed between the connecting end 1210 and the second end 1202, and the elastic member 122 is connected to the flexible guide pipe 11 through the connecting member 123, so that when the flexible guide pipe 11 is acted upon by an external force and moves toward the side where the connecting member 123 is located, one end of the flexible guide pipe 11 can compress the elastic member 122 through the connecting member 123, so that the elastic member 122 applies an elastic restoring force to one end of the flexible guide pipe 11 through the connecting member 123, thereby helping to maintain the position of this end of the flexible guide pipe 11 in a relatively stable state.

[0048] In actual use, the end of the flexible guide pipe 11 away from the rigid guide pipe 10 is set on the seabed, and the elastic protection component 12 is suspended on the side of the flexible guide pipe 11 facing the sea surface by a chain. When the end of the flexible guide pipe 11 away from the rigid guide pipe 10 is lifted toward the sea surface, the elastic member 122 applies an elastic force to the end of the flexible guide pipe 11 through the connecting member 123, so that the end of the flexible guide pipe 11 can be kept more stably in a state of being set on the seabed, thereby keeping the bending curvature of the flexible guide pipe 11 in a relatively stable state, so as to protect the submarine cable passed through the flexible guide pipe 11 and keep the submarine cable in a laying posture with a relatively stable bending curvature, thereby making the service life of the submarine cable longer and the reliability of use better.

[0049] In addition, due to the different overall weights of the submarine cable and the flexible guide pipe 11, when the submarine cable and the flexible guide pipe 11 move under the action of seawater, the forces applied to the connecting member 123 are also different. Therefore, by rotating the adjusting end 1211 of the adjusting member 121, the distance between the connecting end 1210 and the second end 1202 can be adjusted, and then the amount of compression compressed between the connecting end 1210 and the second end 1202 can be adjusted, so that the magnitude of the elastic force applied by the elastic member 122 to one end of the flexible guide pipe 11 when one end of the flexible guide pipe 11 is slightly lifted can be adjusted, so that the elastic protection component 12 is suitable for protecting submarine cables and flexible guide pipes 11 with different weights.

[0050] Among them, optionally, the flexible guide pipe 11 can be tied and fixed to the outer periphery of one end of the rigid guide pipe 10 by a fixing sleeve (not shown in the figure). In addition, the flexible guide pipe 11 can also be connected to the rigid guide pipe 10 by any existing pipe connection method.

[0051] Optionally, the assembly base 120 includes a main body 1204 and a sliding member 1205, the main body 1204 has a slide groove 1204a and a first end 1201, the sliding member 1205 has a second end 1202 and a first inner cavity 1203, the sliding member 1205 can be slidably connected to the slide groove 1204a along the relative direction between the first end 1201 and the second end 1202, and the end of the sliding member 1205 close to the first end 1201 is further provided with a third through hole 1205a connected to the first inner cavity 1203, so that the first through hole 1201a passes through the slide groove 1204a and the third through hole 1205a is connected to the first inner cavity 1203, and the adjusting member 121 and the main body 1204 are connected at the upper limit position along the relative direction between the first end 1201 and the second end 1202. The adjusting member 121 is also passed through the third through hole 1205a, and the connecting end 1210 is threadedly connected to the wall of the first inner cavity 1203, so that the sliding member 1205 can slide relative to the sliding groove 1204a by rotating the adjusting end 1211. At the same time, since the relative position of the adjusting member 121 and the main body 1204 remains unchanged, the distance between the connecting end 1210 and the second end 1202 can be adjusted.

[0052] At this time, optionally, two limiting portions 1212 may be protruded from the outer periphery of the adjusting member 121, and the limiting portions 1212 may be connected to the adjusting member 121 by methods including but not limited to welding, screwing, gluing, and clamping. The two limiting portions 1212 are spaced apart along the relative direction between the first end 1201 and the second end 1202, and one of the limiting portions 1212 abuts against the end face of the first end 1201, and the other limiting portion 1212 abuts against the bottom surface of the slide groove 1204a away from the sliding member 1205, so as to limit the relative position of the adjusting member 121 and the main body 1204 along the relative direction between the first end 1201 and the second end 1202.

[0053] In other embodiments, a limiting structure (not shown in the figure) may be provided on the main body 1204 to limit the relative position of the adjustment member 121 and the main body 1204 along the relative directions of the first end 1201 and the second end 1202 .

[0054] Optionally, a protrusion 1204b may be further provided on the periphery of the first end 1201 of the main body 1204, and the protrusion 1204b is used for connection of a chain, so that when the elastic protection component 12 is hoisted and used, a connection position can be provided for the chain through the protrusion 1204b.

[0055] Please combine Figures 3 to 5Optionally, the flexible guide pipe 11 includes a main body 111 and a thickened portion 112, one end of the main body 111 is connected to one end of the rigid guide pipe 10, and the interior of the main body 111 is used for passing the submarine cable, the thickened portion 112 is arranged around the outer periphery of the main body 111 and the thickened portion 112 is located between the two opposite ends of the main body 111, so that the thickness of the part of the structure between the two ends of the flexible guide pipe 11 can be thickened by the thickened portion 112 to increase the external force required when the flexible guide pipe 11 is bent. In other words, the bending difficulty of the flexible guide pipe 11 is increased to reduce the possibility of excessive bending of the flexible guide pipe 11 during use.

[0056] Optionally, the thickened portion 112 is provided with a second inner cavity 1120 surrounding the outer circumference of the main body 111, and the thickened portion 112 is further provided with a plurality of communicating holes 1121, which are connected to the second inner cavity 1120 and pass through the end surface of the thickened portion 112 along the extension direction of the main body 111. Along the extension direction of the main body 111, the second inner cavity 1120 is also alternately provided with a first baffle 113 and a second baffle 114. The first baffle 113 surrounds and is connected to the outer circumference of the main body 111, and a gap is formed between the first baffle 113 and the thickened portion 112. The second baffle 114 surrounds the main body 111 and is connected to the thickened portion 112, and a gap is formed between the second baffle 114 and the main body 111. Therefore, when the submarine cable is subjected to the force exerted by the flow of seawater and moves, the main body 111 and the thickened portion 114 are spaced apart in the radial direction of the main body 111. The local distance of the part 112 may change, resulting in a change in the volume of the second inner cavity 1120, which in turn causes the seawater in the second inner cavity 1120 to be squeezed out from the communicating hole 1121, or the seawater outside the thickened part 112 is sucked into the second inner cavity 1120 from the communicating hole 1121. In this process, due to the blocking effect of the first baffle 113 and the second baffle 114 on the seawater, the flow trajectory of the seawater in the second inner cavity 1120 will become wavy, so that the seawater can consume a certain amount of energy in the process of turning flow, and the small hole, the gap between the first baffle 113 and the thickened part 112, and the gap between the second baffle 114 and the main body 111 will have a damping effect on the seawater flowing through, consume the flow energy of the seawater, and thus achieve the effect of reducing the vibration amplitude generated by the main body 111, thereby improving the posture stability of the flexible guide pipe 11.

[0057] The thickened portion 112 and the main body 111 can be formed separately and then assembled after the second baffle 114 and the first baffle 113 are respectively provided.

[0058] Furthermore, the first baffle 113 and the second baffle 114 can both be one, or at least one of the first baffle 113 and the second baffle 114 can be multiple, so that the blocking and damping effects of the baffles on seawater can be enhanced by increasing the number of baffles, so that the seawater can consume more energy in the second inner cavity 1120, so as to further reduce the vibration amplitude generated by the main body 111.

[0059] Optionally, the first baffle 113 is an elastic baffle, or the second baffle 114 is an elastic baffle, or both the first baffle 113 and the second baffle 114 are elastic baffles, so that after the main body 111 provided with the first baffle 113 and the thickened portion 112 provided with the second baffle 114 are respectively formed, the first baffle 113 and / or the second baffle 114 can be elastically deformed so that the thickened portion 112 can be sleeved on the main body 111 to achieve assembly of the thickened portion 112 and the main body 111.

[0060] In addition, after the thickened portion 112 and the main body 111 are assembled, the thickened portion 112 and the main body 111 may be fixed by methods including but not limited to gluing, welding, etc.

[0061] In other embodiments, the thickened portion 112 may include multiple separately formed sub-portions (not shown in the figure), and the multiple sub-portions are arranged and assembled around the main body 111 to obtain the thickened portion 112 assembled on the outer periphery of the main body 111.

[0062] Optionally, a first magnet 115 and a second magnet 116 are further provided in the second inner cavity 1120. The first magnet 115 surrounds and is connected to the outer periphery of the main body 111, and the second magnet 116 surrounds the first magnet 115 at intervals and is connected to the thickened portion 112. The magnetic poles of the parts where the first magnet 115 and the second magnet 116 are close to each other are the same, so that the mutual repulsion generated by the first magnet 115 and the second magnet 116 can produce a negative stiffness effect, thereby further absorbing the vibration energy between the thickened portion 112 and the main body 111, so as to further reduce the vibration amplitude generated by the main body 111.

[0063] Preferably, both the first magnet 115 and the second magnet 116 may be strong magnets, so that the negative stiffness effect generated between the first magnet 115 and the second magnet 116 is stronger.

[0064] Optionally, the first magnet 115 and the second magnet 116 may be located between any adjacent first baffle 113 and second baffle 114 , so that the first magnet 115 , the second magnet 116 , the first baffle 113 and the second baffle 114 are arranged in a compact and reasonable manner.

[0065] Optionally, the protective device 1 also includes a fixing ring 13, which can be movably sleeved on the end of the flexible guide pipe 11 away from the rigid guide pipe 10, and the end of the connecting member 123 away from the elastic member 122 can be detachably connected to the fixing ring 13, so that the elastic protective component 12 can be easily disconnected from the flexible guide pipe 11 through the fixing ring 13.

[0066] Furthermore, the end of the connector 123 away from the elastic member 122 can be detachably connected to the fixing ring 13, and when the connector 123 is connected to the fixing ring 13, the connector 123 can rotate relative to the fixing ring 13 around the extension direction of the connector 123, so that the relative posture of the protective device 1 and the flexible guide pipe 11 is more flexible, and it can avoid that when the flexible guide pipe 11 rotates relative to the connector 123 around the extension direction of the connector 123, the torque on the connector 123 is too large, resulting in the breakage of the connector 123 or the breakage of the connection between the connector 123 and the flexible guide pipe 11, thereby reducing the possibility of failure of the connection between the connector 123 and the flexible guide pipe 11.

[0067] The present invention provides a method for laying a submarine cable. Figure 1 and Figure 2 The laying method of the submarine cable uses the protective device 1 as described in the above technical solution, and the laying method of the submarine cable includes the following steps:

[0068] Step S1: According to the weight of the submarine cable to be laid, the adjusting end 1211 is rotated to adjust the compression amount of the elastic member 122.

[0069] For example, since the overall weight of the submarine cable and the flexible guide pipe 11 is greater, when the submarine cable and the flexible guide pipe 11 move under the action of seawater, the overall inertia of the submarine cable and the flexible guide pipe 11 is greater, and therefore the force applied to the connecting piece 123 is also greater. Therefore, the adjustment end 1211 can be rotated to make the distance between the connecting end 1210 and the second end 1202 smaller, so that the compression amount of the elastic member 122 is greater, and then when one end of the flexible guide pipe 11 is slightly lifted, the elastic member 122 can apply a greater elastic force to the flexible guide pipe 11 through the connecting piece 123.

[0070] In addition, considering that marine organisms may attach to the surface of the flexible guide pipe 11 during the long-term use of the submarine cable, resulting in a greater inertia when one end of the flexible guide pipe 11 is slightly lifted, therefore, in the process of step S1, the compression amount of the elastic member 122 can be adjusted according to the force that may be applied to the connecting member 123 when the submarine cable and the flexible guide pipe 11 are lifted as a whole, plus a certain redundant force, so that when one end of the flexible guide pipe 11 is slightly lifted, the elastic member 122 can apply a force to the flexible guide pipe 11 that is slightly greater than the force that may be applied to the connecting member 123 when the submarine cable and the flexible guide pipe 11 are lifted as a whole.

[0071] Step S2: placing the protection device 1 in the ocean.

[0072] Specifically, the rigid guide pipe 10 , the flexible guide pipe 11 and the elastic protection component 12 can be assembled into a complete protection device 1 , and then the protection device 1 can be hoisted to the seabed through chains.

[0073] When the connecting member 123 is detachably connected to the flexible guide pipe 11, optionally, step S2 includes:

[0074] Step S20: placing the rigid guide pipe 10 and the flexible guide pipe 11 in the ocean.

[0075] Specifically, the rigid guide pipe 10 and the flexible guide pipe 11 can be hoisted into the water separately, and then the rigid guide pipe 10 and the flexible guide pipe 11 can be connected manually on the seabed. Alternatively, the rigid guide pipe 10 and the flexible guide pipe 11 can be connected first, and then the rigid guide pipe 10 and the flexible guide pipe 11 can be hoisted into the water as a whole.

[0076] Among them, since the rigid guide pipe 10 usually extends from the offshore wind farm to the seabed, the length of the rigid guide pipe 10 is very long. In the process of first connecting the rigid guide pipe 10 with the flexible guide pipe 11 and then hoisting the rigid guide pipe 10 and the flexible guide pipe 11 into the water as a whole, on the one hand, it can reduce manual labor on the seabed. On the other hand, since it is only necessary to hoist the rigid guide pipe 10 and the flexible guide pipe 11 as a whole downward until the flexible guide pipe 11 is placed on the seabed, the rigid guide pipe 10 and the flexible guide pipe 11 can be hoisted into place as a whole, that is, the difficulty of hoisting the rigid guide pipe 10 and the flexible guide pipe 11 can be reduced.

[0077] Step S21: sink the elastic protection component 12 into the ocean.

[0078] Step S22 : Connect the connector 123 to the flexible guide pipe 11 .

[0079] Since the elastic protection component 12 needs to be connected to the end of the flexible guide pipe 11 away from the rigid guide pipe 10, and when the flexible guide pipe 11 and the rigid guide pipe 10 are hoisted, it is necessary to hoist the rigid guide pipe 10 by a chain to hoist the flexible guide pipe 11 and the rigid guide pipe 10 as a whole. Therefore, the hoisting position of the elastic protection component 12 is far away from the hoisting position of the rigid guide pipe 10. By hoisting the flexible guide pipe 11 and the rigid guide pipe 10 as a whole separately from the elastic protection component 12, the overall hoisting difficulty can be reduced.

[0080] In addition, since the subsequent submarine cable laying steps require manual underwater cable laying operations, having manual underwater connection operations of the connector 123 and the flexible guide pipe 11 in step S22 will not result in an additional increase in the number of underwater personnel required in the submarine cable laying method provided in this embodiment.

[0081] Step S3: insert the submarine cable into the rigid guide pipe 10 and the flexible guide pipe 11 .

[0082] Therefore, the submarine cable laying method provided in this embodiment can use the aforementioned protection device 1 to protect the submarine cable and realize the laying of the submarine cable.

[0083] In order to reduce the friction between the submarine cable and the inner wall surfaces of the rigid guide pipe 10 and the flexible guide pipe 11 when the submarine cable is passed through the rigid guide pipe 10 and the flexible guide pipe 11 in step S3, thereby reducing the possibility of damage to the submarine cable during step S3 and reducing the sliding amplitude of the submarine cable relative to the rigid guide pipe 10 and the flexible guide pipe 11 during use, optionally, before step S2, the submarine cable laying method further includes:

[0084] Step S1a: applying viscous grease to the inner wall surfaces of the rigid guide pipe 10 and the flexible guide pipe 11 .

[0085] It is understandable that since step S1a and step S1 do not interfere with each other and are not related to each other, step S1a and step S1 can be performed simultaneously, or step S1a can be performed first and then step S1, or step S1 can be performed first and then step S1a.

[0086] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0087] In this specification, reference to terms such as "one embodiment" or "example" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0088] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0089] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are intended solely to illustrate the principles of the present invention and are not to be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, those skilled in the art will readily conceive of other specific embodiments of the present invention without inventive effort, and such embodiments will fall within the scope of protection of the present invention.

Claims

1. A protection device for protecting a submarine cable, characterized in that: The protection device comprises: a rigid guide pipe, wherein the interior of the rigid guide pipe is used for passing the submarine cable; a flexible guide pipe, the flexible guide pipe being connected to one end of the rigid guide pipe, the interior of the flexible guide pipe being used for passing the submarine cable; and 18. The foldable member as claimed in claim 15, wherein the linking member is a pair of linking elements, wherein the linking member is a pair of linking elements. The linking member is a pair of linking elements comprising a first end, a second end, and a second end of the linking member. The linking member is a pair of linking elements comprising a first end, a second end, and a second end of the linking member. The linking member is a pair of linking elements comprising a first end, a second end, and a second end of the linking member.

2. The protection device according to claim 1, characterized in that The component seat includes a main body and a sliding member, the main body having a slide groove and the first end, the sliding member having the second end and the first inner cavity, the sliding member can be slidably fitted in the slide groove along the relative direction between the first end and the second end, and the end of the sliding member close to the first end is also provided with a third through hole connected to the first inner cavity, the adjusting member and the main body are upper limit connected along the relative direction between the first end and the second end, the adjusting member is also passed through the third through hole, and the connecting end is threadedly connected to the wall of the first inner cavity.

3. The protection device according to claim 1, characterized in that: The flexible guide pipe includes a main body and a thickened portion. One end of the main body is connected to one end of the rigid guide pipe, and the interior of the main body is used for passing the submarine cable. The thickened portion is arranged around the outer circumference of the main body and is located between the two opposite ends of the main body.

4. The protection device according to claim 3, characterized in that: The thickened portion is provided with a second inner cavity surrounding the outer circumference of the main body portion, and the thickened portion is also provided with a plurality of communicating holes, which are connected to the second inner cavity and pass through the end surface of the thickened portion along the extension direction of the main body portion. Along the extension direction of the main body portion, the second inner cavity is also alternately provided with first baffles and second baffles, the first baffle surrounds and is connected to the outer circumference of the main body portion, and a gap is formed between the first baffle and the thickened portion, the second baffle surrounds the main body portion and is connected to the thickened portion, and a gap is formed between the second baffle and the main body portion.

5. The protection device according to claim 4, characterized in that: The first baffle is an elastic baffle, and / or the second baffle is an elastic baffle.

6. The protection device according to claim 4 or 5, characterized in that: A first magnet and a second magnet are also provided in the second inner cavity. The first magnet surrounds and is connected to the outer periphery of the main body, and the second magnet surrounds the first magnet at intervals and is connected to the thickened portion, and the magnetic poles of the parts where the first magnet and the second magnet are close to each other are the same.

7. The protection device according to any one of claims 1 to 5, characterized in that: The protection device further comprises a fixing ring, which is movably sleeved on an end of the flexible guide pipe away from the rigid guide pipe, and an end of the connecting member away from the elastic member is detachably connected to the fixing ring.

8. A method for laying a submarine cable, characterized in that: Using the protection device according to any one of claims 1 to 7, the method for laying the submarine cable comprises the following steps: Step S1: rotating the adjustment end to adjust the compression amount of the elastic member according to the weight of the submarine cable to be laid; Step S2, placing the protection device in the ocean; Step S3: inserting the submarine cable into the rigid guide pipe and the flexible guide pipe.

9. The method for laying a submarine cable according to claim 8, characterized in that: The connecting piece is detachably connected to the flexible guide pipe, and the step S2 includes: Step S20: placing the rigid guide pipe and the flexible guide pipe in the ocean; Step S21: sinking the elastic protection component into the ocean; Step S22: Connect the connecting piece to the flexible guide pipe.

10. The method for laying a submarine cable according to claim 8 or 9, characterized in that: Before step S2, the submarine cable laying method further includes: Step S1a: applying viscous grease to the inner wall surfaces of the rigid guide pipe and the flexible guide pipe.

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