Protection device and submarine cable laying method

Abstract

The invention discloses a protection device and a submarine cable laying method.The protection device comprises a rigid guide pipeline, a flexible guide pipeline and an elastic protection assembly, the elastic protection assembly comprises an assembly base, an adjusting piece, an elastic piece and a connecting piece, the assembly base is provided with a first inner cavity, a first end and a second end, and the first end and the second end are opposite; the adjusting part is in threaded connection with the assembly seat body, the adjusting part is provided with a connecting end and an adjusting end which are opposite, the connecting end is located in the first inner cavity, the adjusting part can rotate relative to the assembly seat body to adjust the distance between the connecting end and the second end, the adjusting end is located outside the first inner cavity, and the elastic part can comprise but not limited to a spring and an elastic piece. The elastic piece is located in the first inner cavity and compressed between the connecting end and the second end, and the connecting piece is connected between the end, away from the connecting end, of the elastic piece and the end, away from the rigid guiding pipeline, of the flexible guiding pipeline. The protection device can protect the submarine cable, so that the submarine cable is kept in the laying posture with the 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 marine cable. Background Art

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

[0003] When part of the submarine cable needs to be laid in a curved shape, in order to avoid stress concentration in the submarine cable, the curved part of the submarine cable is usually placed inside a flexible guide pipe. However, due to the harsh environment in the ocean, the bending curvature of the flexible guide pipe and the submarine cable may change easily 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 so as to maintain 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, the interior of which is used for the submarine cable to pass through;

[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 the submarine cable to pass through; and

[0010] 14. The invention relates to a novel elastic protection component, wherein the elastic protection component comprises a component base, an adjusting member, an elastic member and a connecting member, the component base having a first end and a second end opposite to each other, the component base also having a first inner cavity between the first end and the second end, the first end being provided with a first through hole connected to the first inner cavity, the second end being provided with a second through hole connected to the first inner cavity, the adjusting member being screwed to the component base and passing through the first through hole, the adjusting member having a connecting end and an adjusting end opposite to each other, the connecting end being located in the first inner cavity, the adjusting member being able to rotate relative to the component base to adjust the distance between the connecting end and the second end, the adjusting end being located outside the first inner cavity, the elastic member being located in the first inner cavity and being compressed between the connecting end and the second end, the connecting member being slidably passed through the second through hole, and the connecting member being 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.

[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 connected to the slide groove along the relative direction of the first end and the second end, 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 upper limit connected to the main body along the relative direction of the first end and the second end, the adjusting member is also penetrated 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 the thickened portion 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 connecting holes, the connecting holes are connected to the second inner cavity and penetrate the end surface of the thickened portion along the extension direction of the main body portion, and 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 protection 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 an end of the flexible guide pipe away from the rigid guide pipe, and an end of the connecting piece away from the elastic piece is detachably connected to the fixing ring.

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

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

[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 method for laying the submarine cable, the connector is detachably connected to the flexible guide pipe, and the step S2 comprises:

[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 moved toward the side where the connecting member is located by an external force, 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, one 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 more stably maintained 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, when the submarine cable and the flexible guide pipe move under the action of seawater, the forces applied to the connecting piece are also different. Therefore, by rotating the adjusting end of the adjusting piece, 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 when one end of the flexible guide pipe is slightly lifted, the size of the elastic force applied by the elastic piece to one end of the flexible guide pipe 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 is further described in detail below based on the accompanying drawings and embodiments.

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

[0033] Figure 2 It is a schematic cross-sectional view of the elastic protection component described in the embodiment.

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

[0037] In the figure:

[0038] 1. Protective device;

[0039] 10. Rigid guide pipe;

[0040] 11. flexible guide pipe; 111. main body; 112. thickened portion; 1120. second inner cavity; 1121. connecting hole; 113. first baffle; 114. second baffle; 115. first magnet; 116. second magnet;

[0041] 12. Elastic protection component; 120. Component seat; 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] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0044] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates 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 penetrates 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 penetrated in 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, so as to help maintain the position of the one end of the flexible guide pipe 11 in a relatively stable state.

[0048] In actual use, one 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 through 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 more stably maintained 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, so that the submarine cable can be maintained 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 when one end of the flexible guide pipe 11 is slightly lifted, the elastic force applied by the elastic member 122 to one end of the flexible guide pipe 11 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] Optionally, the flexible guide pipe 11 can be fastened and fixed to the outer periphery of one end of the rigid guide pipe 10 by a fixing sleeve (not shown). In addition, the flexible guide pipe 11 can 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 matched and 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 also 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, 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 penetrated by 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 surface 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 adjusting member 121 and the main body 1204 along the relative directions between 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 the passage of the submarine cable, the thickened portion 112 is arranged around the outer circumference 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 partial 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 also provided with a plurality of connecting holes 1121, and the connecting holes 1121 are connected to the second inner cavity 1120 and penetrate the end surface of the thickened portion 112 along the extension direction of the main body 111, and 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 at intervals, 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, and 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, so that when the submarine cable is subjected to the force exerted by the flow of seawater and moves, along the radial direction of the main body 111, the main body 111 and the thickened portion 114 are connected. The local distance of the thickened portion 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 connecting hole 1121, or the seawater outside the thickened portion 112 is sucked into the second inner cavity 1120 from the connecting 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 portion 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 then 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 can be formed separately from the main body 111 and the second baffle 114 and the first baffle 113 can be respectively provided and then assembled.

[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 thickened portion 112 and the main body 111 can be assembled by elastically deforming the first baffle 113 and / or the second baffle 114 so that the thickened portion 112 can be sleeved on 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 a plurality of separately formed sub-portions (not shown in the figure), and the plurality of sub-portions are arranged and assembled around the main body 111 to obtain the thickened portion 112 assembled on the 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 adjacent portions of the first magnet 115 and the second magnet 116 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, the first magnet 115 and the second magnet 116 may both 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 disposed in a compact and reasonable manner.

[0065] Optionally, the protection 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 piece 123 away from the elastic piece 122 can be detachably connected to the fixing ring 13, so that the elastic protection component 12 can be easily detached from the flexible guide pipe 11 through the fixing ring 13.

[0066] Furthermore, one end of the connecting piece 123 away from the elastic piece 122 can be detachably connected to the fixing ring 13, and when the connecting piece 123 is connected to the fixing ring 13, the connecting piece 123 can be rotated relative to the fixing ring 13 around the extension direction of the connecting piece 123, so that the relative posture of the protective device 1 and the flexible guide pipe 11 is more flexible, and it can be avoided that when the flexible guide pipe 11 rotates relative to the connecting piece 123 around the extension direction of the connecting piece 123, the torque on the connecting piece 123 is too large, resulting in the breakage of the connecting piece 123 or the breakage of the connection between the connecting piece 123 and the flexible guide pipe 11, thereby reducing the possibility of failure of the connection between the connecting piece 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 protection device 1 as described in the above technical solution, and the laying method of the submarine cable comprises the following steps:

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

[0069] For example, as 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 force applied by the elastic member 122 to the flexible guide pipe 11 through the connecting piece 123 is greater.

[0070] In addition, considering that during the long-term use of the submarine cable, marine organisms may attach to the surface of the flexible guide pipe 11, resulting in a greater inertia when one end of the flexible guide pipe 11 is slightly lifted, therefore, in 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 is usually extended 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 the manual work 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, sinking the elastic protection component 12 into the ocean.

[0078] Step S22 , connecting the connecting piece 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 method for laying a submarine cable 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, so as to reduce the possibility of damage to the submarine cable during step S3, and reduce 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 can be understood 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", etc., and the like, are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0087] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0088] In addition, it should be understood that although this specification is described according to 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 may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0089] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods 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, the interior of which is used for the submarine cable to pass through; 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 the submarine cable to pass through; and 14. The invention relates to a novel elastic protection component, wherein the elastic protection component comprises a component base, an adjusting member, an elastic member and a connecting member, the component base having a first end and a second end opposite to each other, the component base also having a first inner cavity between the first end and the second end, the first end being provided with a first through hole connected to the first inner cavity, the second end being provided with a second through hole connected to the first inner cavity, the adjusting member being screwed to the component base and passing through the first through hole, the adjusting member having a connecting end and an adjusting end opposite to each other, the connecting end being located in the first inner cavity, the adjusting member being able to rotate relative to the component base to adjust the distance between the connecting end and the second end, the adjusting end being located outside the first inner cavity, the elastic member being located in the first inner cavity and being compressed between the connecting end and the second end, the connecting member being slidably passed through the second through hole, and the connecting member being 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.

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 connected to the slide groove along the relative direction between the first end and the second end, 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 upper limit connected to the main body along the relative direction between the first end and the second end, the adjusting member is also penetrated 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 connecting holes, the connecting holes are connected to the second inner cavity and penetrate the end surface of the thickened portion along the extension direction of the main body portion, and 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, and 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. The magnetic poles of the first magnet and the second magnet that 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 also includes 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 piece away from the elastic piece 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, according to the weight of the submarine cable to be laid, rotating the adjustment end to adjust the compression amount of the elastic member; 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 comprises: 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 method for laying the submarine cable 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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