Submarine cable manufacturing method and submarine cable

Abstract

The present application relates to the technical field of submarine cables, and provides a submarine cable manufacturing method and a submarine cable. The submarine cable manufacturing method comprises: using a frame stranding machine to perform primary stranding to strand a central line, a first conductor layer and an optical fiber transmission layer of a submarine cable; and using a frame stranding machine to perform secondary stranding to strand a second conductor layer of the submarine cable, wherein the frame stranding machines of the same specification are used for primary stranding and secondary stranding. According to the submarine cable manufacturing method provided by the present application, a submarine cable having a large sectional area can be manufactured by using the frame stranding machines of existing specifications, so that the cost of increasing the sectional area of the submarine cable is low.

Description

Submarine cable manufacturing method and submarine cable

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on April 3, 2024, with application number 202410407979.8 and application name “Submarine Cable Manufacturing Method and Submarine Cable”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of submarine cables, and in particular to a method for manufacturing a submarine cable and a submarine cable. Background Art

[0003] With the rapid development of offshore wind power technology, the requirements of offshore wind power equipment for the transmission current carrying capacity of submarine cables will gradually increase.

[0004] As the current carrying capacity of submarine cables increases, the cross-sectional area of ​​submarine cables also increases. Submarine cables are produced by stranding machines. The maximum cross-sectional area of ​​cables that a specific stranding machine can produce is a fixed value. If a submarine cable with a larger cross-sectional area needs to be produced, the stranding machine needs to be upgraded. For example, most submarine cable manufacturers use 127-reel stranding machines to produce submarine cables. The maximum cross-sectional area of ​​submarine cables that a 127-reel stranding machine can produce is 3000mm. 2 , the 127-drum frame stranding machine can be transformed into a 169-drum frame stranding machine. The maximum cross-sectional area of ​​the submarine cable that can be prepared by the 169-drum frame stranding machine is 5000mm 2 However, the cost of upgrading a 127-bobbin stranding machine to a 169-bobbin stranding machine is relatively high. Therefore, the cost of increasing the cross-sectional area of ​​a submarine cable by upgrading a stranding machine is relatively high.

[0005] In the related art, the cost of increasing the cross-section of the submarine cable is high. Summary of the Invention

[0006] The present application provides a submarine cable manufacturing method and a submarine cable, which can use a frame stranding machine of existing specifications to prepare a submarine cable with a larger cross-sectional area, so that the cost of increasing the cross-sectional area of ​​the submarine cable is relatively low.

[0007] The present application provides a method for manufacturing a submarine cable, comprising:

[0008] A frame stranding machine is used to perform primary stranding to strand the center line, the first conductor layer and the optical fiber conducting layer of the submarine cable;

[0009] A secondary stranding is performed using a frame stranding machine to strand the second conductor layer of the submarine cable, wherein the frame stranding machine used for the primary stranding and the secondary stranding is the same specification.

[0010] In one possible embodiment, the submarine cable manufacturing method provided in the present application uses a frame stranding machine for secondary stranding to strand the second conductor layer of the submarine cable, including: when the second conductor layer is one layer, the cross-sectional area of ​​the second wire in the second conductor layer is: the cross-sectional area of ​​the second conductor layer / the number of nodes in the outermost layer of the frame stranding machine.

[0011] In one possible embodiment, the submarine cable manufacturing method provided by the present application uses a frame stranding machine for secondary stranding to strand the second conductor layer of the submarine cable, including: when the second conductor layer is two layers, the cross-sectional area of ​​the second wire in the second conductor layer is: the cross-sectional area of ​​the second conductor layer / (the number of nodes in the outermost layer of the frame stranding machine + the number of nodes in the second to last layer of the frame stranding machine).

[0012] In one possible embodiment, the submarine cable manufacturing method provided by the present application uses a frame stranding machine for secondary stranding to strand the second conductor layer of the submarine cable, including: when the second conductor layer is three layers, the cross-sectional area of ​​the second wire in the second conductor layer is: the cross-sectional area of ​​the second conductor layer / (the number of nodes in the outermost layer of the frame stranding machine + the number of nodes in the second to last layer of the frame stranding machine + the number of nodes in the third to last layer of the frame stranding machine).

[0013] In one possible embodiment, the method for manufacturing a submarine cable provided in the present application includes: using a frame stranding machine to perform a single stranding to strand the center line, the first conductor layer, and the optical fiber conductive layer of the submarine cable; and then comprising:

[0014] Two layers of first water-blocking tapes are wrapped around the optical fiber conductive layer; and the central line, the first conductor layer and the optical fiber conductive layer are heated.

[0015] In a possible embodiment, the submarine cable manufacturing method provided in the present application uses a frame stranding machine for secondary stranding to strand the second conductor layer of the submarine cable, and includes: stripping the first water-blocking tape of the outer layer.

[0016] The present application also provides a submarine cable, comprising a center line, a first conductor layer, an optical fiber conductive layer, a first water-blocking tape, a second conductor layer, a second water-blocking tape and a protective layer, which are arranged in sequence from the radial inside to the outside of the coastal cable, wherein the first conductor layer is multi-layered, and each first conductor layer includes a plurality of first conductors arranged in sequence along the circumference of the coastal cable, and the second conductor layer is at least one layer, and each second conductor layer includes a plurality of second conductors arranged in sequence along the circumference of the coastal cable.

[0017] In one possible embodiment, in the submarine cable provided by the present application, the first conductor is trapezoidal, the first short side of the first conductor is toward the center line, the first long side of the first conductor is away from the center line, and the first oblique sides of adjacent first conductors are abutted; the spacing between the first long side and the first short side is less than the spacing between the two first oblique sides.

[0018] In one possible embodiment, in the submarine cable provided by the present application, the second conductor is trapezoidal, the second short side of the second conductor faces the center line, the second long side of the second conductor faces away from the center line, and the second oblique sides of adjacent second conductors abut each other; the spacing between the second long side and the second short side is smaller than the spacing between the two second oblique sides.

[0019] In one possible embodiment, the submarine cable provided by the present application has a first conductor in the form of a fan-shaped ring, the first conductor including a first inner arc and a first outer arc, the first inner arc facing the center line, and the first outer arc away from the center line; the two first sides of the first conductor have first teeth, and the first teeth on the first sides of two adjacent first conductors are meshed.

[0020] In one possible embodiment, the submarine cable provided by the present application, the second conductor is in a fan-shaped ring shape, the second conductor includes a second inner arc and a second outer arc, the second inner arc faces the center line, and the second outer arc faces away from the center line; the second side of the second conductor has a second tooth portion, and the second teeth on the second sides of two adjacent second conductors are meshed.

[0021] In one possible embodiment, the submarine cable provided by the present application, the optical fiber transmission layer includes a plurality of filling segments and a plurality of optical fibers, and the plurality of optical fibers and the plurality of filling segments are arranged at circumferential intervals along the coastal cable; the filling segments include a first filling segment and a second filling segment, both sides of the optical fiber are the first filling segments, and the first filling segment is in contact with the outer wall of the optical fiber on the side facing the optical fiber; the plurality of second filling segments are arranged in sequence along the circumferential direction on the side of the first filling segment away from the optical fiber, the first filling segment has a third tooth portion on the side away from the optical fiber, and both sides of the second filling segment have a fourth tooth portion; the third tooth portion is meshed with the fourth tooth portion adjacent to the third tooth portion, and the adjacent fourth tooth portions are meshed.

[0022] In a possible embodiment, in the submarine cable provided in the present application, the first water-blocking tape is wrapped in a butt-seam manner; and the second water-blocking tape is wrapped in a lap-lap manner.

[0023] The present application provides a method for manufacturing a submarine cable and a submarine cable. The method for manufacturing a submarine cable comprises the following two steps: using a frame stranding machine to perform a primary stranding to strand the center line, the first conductor layer, and the optical fiber conductive layer of the submarine cable; and using a frame stranding machine to perform a secondary stranding to strand the second conductor layer of the submarine cable, wherein the frame stranding machine used for the primary stranding and the secondary stranding is the same specification. When producing the submarine cable, the submarine cable is stranded twice using a frame stranding machine of the same specification. During the secondary stranding, a larger number of sections in the frame stranding machine can be used for stranding. Thus, the cross-sectional area of ​​the submarine cable can be increased without modifying the frame stranding machine, thereby reducing the cost of increasing the cross-sectional area of ​​the submarine cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] FIG1 is a flow chart of a method for manufacturing a submarine cable according to an embodiment of the present application;

[0026] FIG2 is a schematic structural diagram of a submarine cable manufactured using the submarine cable manufacturing method provided in an embodiment of the present application;

[0027] FIG3 is a schematic diagram of a primary twisting process in a submarine cable manufacturing method provided in an embodiment of the present application;

[0028] FIG4 is a schematic diagram of a primary twisting process in a submarine cable manufacturing method provided in an embodiment of the present application;

[0029] FIG5 is a second flow chart of the submarine cable manufacturing method provided in an embodiment of the present application;

[0030] FIG6 is a third flow chart of the submarine cable manufacturing method provided in an embodiment of the present application;

[0031] FIG7 is a first structural diagram of a submarine cable provided in an embodiment of the present application;

[0032] FIG8 is a first structural diagram of a first conductor in a submarine cable provided in an embodiment of the present application;

[0033] FIG9 is a first structural diagram of a second conductor in a submarine cable provided in an embodiment of the present application;

[0034] FIG10 is a second structural diagram of a submarine cable provided in an embodiment of the present application;

[0035] FIG11 is a second structural diagram of the first conductor in the submarine cable provided in an embodiment of the present application;

[0036] FIG12 is a second structural diagram of the second conductor in the submarine cable provided in an embodiment of the present application;

[0037] FIG13 is a third structural diagram of a submarine cable provided in an embodiment of the present application;

[0038] FIG14 is a fourth structural diagram of a submarine cable provided in an embodiment of the present application;

[0039] FIG15 is a schematic diagram of the structure of the optical fiber filling layer in the submarine cable provided in an embodiment of the present application;

[0040] FIG16 is a schematic structural diagram of a first filling section in a submarine cable provided in an embodiment of the present application;

[0041] FIG17 is a schematic structural diagram of the second filling section in the submarine cable provided in an embodiment of the present application.

[0042] Explanation of reference numerals: 100 - submarine cable; 100a - semi-finished submarine cable; 110 - center line; 120 - first conductor layer; 121 - first conductor; 1211 - first short side; 1212 - first long side; 1213 - first oblique side; 1214 - first inner arc; 1215 - first outer arc; 1216 - first side; 1216a - first tooth; 130 - optical fiber conductive layer; 131 - optical fiber; 132 - filling section; 1321 - first filling section; 1321a - third tooth; 1322 - second filling section; 1322a - fourth tooth; 140 - second conductor layer; 141 - second conductor; 1411 - second short side; 1412 - second long side; 1413 - Second bevel; 1414-second inner arc; 1415-second outer arc; 1416-second side; 1416a-second tooth portion; 150-first water-blocking tape; 160-second water-blocking tape; 170-protective layer; 171-PE filling layer; 172-PP inner cushion layer; 173-armored steel wire layer; 200-frame stranding machine; 300-first pay-off device; 400-first traction device; 500-second pay-off device; 600-second traction device; 700-first binding tape wrapping device; 800-stripping machine; 900-second binding tape wrapping device; C1-first layer; C2-second layer; C3-third layer; C4-fourth layer; C5-fifth layer; C6-sixth layer; C7-seventh layer; C-circumferential; R-radial. DETAILED DESCRIPTION

[0043] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0044] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to a fixed connection, an indirect connection via an intermediate medium, internal communication between two components, or an interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0045] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0046] The terms "first," "second," and "third" (if any) in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the application described herein can, for example, be implemented in orders other than those illustrated or described herein.

[0047] In addition, the terms "comprises" and "having" and any variations thereof are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or service tool that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, product or service tool.

[0048] Offshore wind power technology is rapidly developing as a clean energy source. With this rapid development, the transmission capacity of offshore wind power equipment has also increased significantly. Submarine cables are used to transmit the electricity generated by offshore wind power equipment. As the transmission capacity of offshore wind power equipment increases, the requirements for the transmission current carrying capacity of submarine cables will gradually increase.

[0049] As the current carrying capacity of submarine cables increases, the cross-sectional area of ​​submarine cables also increases. Submarine cables are produced by stranding machines. The maximum cross-sectional area of ​​cables that a specific stranding machine can produce is a fixed value. If a submarine cable with a larger cross-sectional area needs to be produced, the stranding machine needs to be upgraded. For example, most submarine cable manufacturers use 127-reel stranding machines to produce submarine cables. The maximum cross-sectional area of ​​submarine cables that a 127-reel stranding machine can produce is 3000mm. 2 , the 127-drum frame stranding machine can be transformed into a 169-drum frame stranding machine. The maximum cross-sectional area of ​​the submarine cable that can be prepared by the 169-drum frame stranding machine is 5000mm 2 .

[0050] However, upgrading a 127-reel frame stranding machine to a 169-reel frame stranding machine requires large-scale equipment modification, and the equipment also needs to be shut down for coordination, which affects production capacity and increases production costs. Therefore, the cost of increasing the cross-sectional area of ​​the submarine cable by upgrading and transforming the frame stranding machine is relatively high.

[0051] In the related art, the cost of increasing the cross-section of the submarine cable is high.

[0052] Based on this, the present application provides a submarine cable manufacturing method and a submarine cable, which can use a frame stranding machine of existing specifications to prepare a submarine cable with a larger cross-sectional area, so that the cost of increasing the cross-sectional area of ​​the submarine cable is relatively low.

[0053] Figure 1 is a flow chart of the first method for manufacturing a submarine cable provided in an embodiment of the present application; Figure 2 is a schematic diagram of the structure of a submarine cable manufactured using the method for manufacturing a submarine cable provided in an embodiment of the present application; Figure 3 is a schematic diagram of the process of one-time twisting in the method for manufacturing a submarine cable provided in an embodiment of the present application; Figure 4 is a schematic diagram of the process of one-time twisting in the method for manufacturing a submarine cable provided in an embodiment of the present application.

[0054] 1 to 4 , the submarine cable manufacturing method provided in the present application includes: using a frame stranding machine 200 to perform a primary stranding to strand the center line 110, the first conductor layer 120 and the optical fiber conductive layer 130 of the submarine cable 100; and using the frame stranding machine 200 to perform a secondary stranding to strand the second conductor layer 140 of the submarine cable 100, wherein the frame stranding machine 200 used for the primary stranding and the secondary stranding is the same specification.

[0055] First, the structure of submarine cable 100 will be briefly described. Continuing with Figure 2, submarine cable 100 comprises, arranged from inside to outside, a centerline 110, a first conductor layer 120, an optical fiber conductive layer 130, and a second conductor layer 140. The first conductor layer 120 can be multi-layered, each comprising a plurality of first conductors 121. The second conductor layer 140 can also be multi-layered, each comprising a plurality of second conductors 141. Figure 1 shows four first conductor layers 120 and one second conductor layer 140. The optical fiber conductive layer 130 comprises a plurality of optical fibers 131, a plurality of first filler segments 1321, and a plurality of second filler segments 1322. A first water-blocking tape 150 is disposed between the optical fiber conductive layer 130 and the second conductor layer 140, and a second water-blocking tape 160 is disposed outside the second conductor layer 140.

[0056] The structure of the frame stranding machine 200 will now be described using a 127-bobbin frame stranding machine as an example. The number "127" in the 127-bobbin frame stranding machine refers to the number of conductors that can be twisted in the frame stranding machine 200. The number of sections in the frame stranding machine 200 indicates the number of conductors that can be twisted in each layer. The sum of the number of sections in the frame stranding machine 200 is the total number of conductors that can be twisted in the frame stranding machine 200.

[0057] Table 1 lists the number of sections of the stranding machine 200 and the number of conductors in each layer of the submarine cable 100 corresponding to the number of sections of the stranding machine 200 . As shown in Table 1 and Figure 2, the center line 110 forms the first layer C1, the four first conductor layers 120 form the second layer C2, the third layer C3, the fourth layer C4 and the fifth layer C5 respectively, the optical fiber conductive layer 130 forms the sixth layer C6, and the second conductor layer 140 forms the seventh layer C7. The first layer C1 includes one center line 110, the second layer C2 includes six first conductors 121, the third layer C3 includes 12 first conductors 121, the fourth layer C4 includes 18 first conductors 121, and the fifth layer C5 includes 24 first conductors 121. The total number of optical fibers 131, first filling segments 1321 and second filling segments 1322 in the sixth layer C6 is 30. The seventh layer C7 includes 36 second conductors 141. The total number of all conductors in each layer is 127. The number of conductors that can be stranded by a 127-bobbin frame stranding machine is 127.

[0058] Table 1 Number of stranding machine sections and the number of conductors in each layer of the submarine cable corresponding to the number of stranding machine sections

[0059] Continuing to refer to Figures 1 and 3, the submarine cable manufacturing method includes:

[0060] S101 , using a frame stranding machine 200 to perform a primary stranding to strand the center line 110 , the first conductor layer 120 and the optical fiber conductive layer 130 of the submarine cable 100 .

[0061] During a single stranding operation, the centerline 110, multiple first conductor layers 120, and optical fiber conductive layers 130 of the submarine cable 100 are stranded using a stranding machine 200. The centerline 110 is stranded using the first stranding section of the stranding machine 200, the first conductor layers 120 are stranded using stranding sections 6 to 24, and the optical fiber conductive layers 130 are stranded using stranding section 30. After the single stranding operation is completed, the centerline 110, multiple first conductor layers 120, and optical fiber conductive layers 130 form the semi-finished submarine cable 100a. It should be noted that during the single stranding operation, the stranding directions of two adjacent first conductor layers 120 are opposite.

[0062] Please continue to refer to Figure 3. During the first twisting, a first pay-off device 300 and a first traction device 400 are also set at the front end of the frame twisting machine 200 to ensure that the center line 110, the multi-layer first conductor layer 120 and the optical fiber conductive layer 130 maintain appropriate tension during the twisting process, wherein the first traction device 400 can be a belt traction device.

[0063] S102 , using a frame stranding machine 200 to perform secondary stranding to strand the second conductor layer 140 of the submarine cable 100 , wherein the frame stranding machine 200 of the same specification is used for the primary stranding and the secondary stranding.

[0064] The semi-finished submarine cable 100a is again placed in a stranding machine 200 of the same specifications to strand the second conductor layer 140 with the semi-finished submarine cable 100a. The second conductor layer 140 is stranded using the 36th section of the stranding machine 200. It should be noted that during the second stranding, the stranding direction of the second conductor layer 140 is opposite to that of the optical fiber conductive layer 130.

[0065] Please continue to refer to Figure 4. During the secondary twisting, a second pay-off device 500 and a second traction device 600 are also set at the front end of the frame twisting machine 200 to ensure that the second conductor layer 140 maintains appropriate tension during the twisting process, wherein the second traction device 600 can be a belt traction device.

[0066] The 127-bobbin frame stranding machine is used for both the primary stranding and the secondary stranding. That is, when producing the submarine cable 100, the cable 100 is stranded twice using a frame stranding machine 200 of the same specification. During the secondary stranding, a larger number of sections in the frame stranding machine 200 can be used for stranding. Thus, the cross-sectional area of ​​the submarine cable 100 can be increased without modifying the frame stranding machine 200, making the cost of increasing the cross-sectional area of ​​the submarine cable 100 relatively low. For example, a cable with a cross-sectional area greater than 3000mm can be produced using a 127-bobbin frame stranding machine. 2 The submarine cable with a cross-sectional area greater than 5000mm can be produced using the 169 bobbin frame stranding machine. 2 submarine cable.

[0067] The submarine cable manufacturing method provided in the embodiment of the present application is provided with the following two steps: S101, using a frame stranding machine 200 to perform a primary stranding to strand the center line 110, the first conductor layer 120 and the optical fiber conductive layer 130 of the submarine cable 100; S102, using the frame stranding machine 200 to perform a secondary stranding to strand the second conductor layer 140 of the submarine cable 100, wherein the primary stranding and the secondary stranding use the frame stranding machine 200 of the same specification. When producing the submarine cable 100, the submarine cable 100 is stranded twice using a frame stranding machine 200 of the same specification. During the secondary stranding, a larger number of sections in the frame stranding machine 200 can be used for stranding. As a result, the cross-sectional area of ​​the submarine cable 100 can be increased without modifying the frame stranding machine 200, making the cost of increasing the cross-sectional area of ​​the submarine cable 100 relatively low.

[0068] During the secondary stranding process, the cross-sectional area of ​​the stranded conductors required for the secondary stranding process must be calculated in advance. Since the maximum number of stranding sections of the frame stranding machine 200 may have already been used during the primary stranding process, the cross-sectional area of ​​the second conductors 141 must be greater than that of the first conductors 121 to ensure close contact between the second conductors 141 in the second conductor layer 140 during the secondary stranding process. Therefore, the cross-sectional area of ​​the second conductors 141 must be calculated. The cross-sectional area of ​​the second conductors 141 can be calculated based on the cross-section of the semi-finished submarine cable 100a and the number of stranding sections of the frame stranding machine.

[0069] In the first embodiment, when the second conductor layer 140 is one layer, the cross-sectional area of ​​the second wire 141 in the second conductor layer 140 is: the cross-sectional area of ​​the second conductor layer 140 / the number of nodes in the outermost layer of the frame stranding machine 200 .

[0070] Specifically, in the submarine cable 100 shown in FIG2 , the second conductor layer 140 is a single layer, and the second conductor layer 140 can be stranded using the outermost number of nodes of the frame stranding machine 200 . For example, in a 127-reel frame stranding machine, the outermost number of nodes is 36.

[0071] First, calculate the cross-sectional area of ​​the second conductor layer 140. After the first stranding, the cross-sectional area of ​​the submarine cable 100 is represented by S1. After the second stranding, the preset cross-sectional area of ​​the submarine cable 100 is represented by S2. The cross-sectional area of ​​the second conductor layer 140 to be stranded is represented by S3. Therefore, the cross-sectional area S3 of the second conductor layer 140 is the difference between S2 and S1. After calculating the cross-sectional area S3 of the second conductor layer 140, divide the cross-sectional area S3 of the second conductor layer 140 by the number of sections of the frame stranding machine 200 to calculate the cross-sectional area of ​​the second conductor 141 in the second conductor layer 140. The cross-sectional area of ​​the second conductor 141 is represented by S4. Therefore, when using a 127-reel frame stranding machine, the cross-sectional area of ​​the second conductor 141 is: S4 = (S2 - S1) / 36.

[0072] In the second embodiment, when the second conductor layer 140 is two layers, the cross-sectional area of ​​the second wire 141 in the second conductor layer 140 is: the cross-sectional area of ​​the second conductor layer 140 / (the number of nodes in the outermost layer of the frame stranding machine 200 + the number of nodes in the second to last layer of the frame stranding machine 200).

[0073] The second conductor layer 140 is two layers, and the second conductor layer 140 can be twisted using the outermost layer and the second-to-last layer of the frame twister 200. For example, in a 127-frame twister, the outermost layer has 36 nodes and the second-to-last layer has 30 nodes.

[0074] First, the cross-sectional area S3 of the second conductor layer 140 is calculated. The calculation method of the cross-sectional area of ​​the second conductor layer 140 is the same as that in the first embodiment, and will not be repeated here.

[0075] After calculating the cross-sectional area S3 of the second conductor layer 140, the cross-sectional area S3 of the second conductor layer 140 is divided by the number of sections of the frame stranding machine 200 to calculate the cross-sectional area of ​​the second conductor 141 in the second conductor layer 140. Since the second conductor layer 140 consists of two layers, the 30th and 36th sections of the frame stranding machine need to be used for stranding. Therefore, the number of second conductors 141 twisted twice is the sum of the number of sections in the outermost layer of the frame stranding machine 200 and the number of sections in the second-to-last layer of the frame stranding machine 200.

[0076] Therefore, when using a 127-bobbin frame stranding machine, the cross-sectional area of ​​the second conductor 141 is: S4 = (S2-S1) / (36+30).

[0077] It should be noted that the twisting directions of two adjacent second conductor layers 140 are opposite. The twisting direction of the second conductor layer 140 closest to the optical fiber conductive layer 130 is opposite to that of the optical fiber conductive layer 130 .

[0078] In a third embodiment, when the second conductor layer 140 has three layers, the cross-sectional area of ​​the second wire 141 in the second conductor layer 140 is: the cross-sectional area of ​​the second conductor layer 140 / (the number of nodes in the outermost layer of the frame stranding machine 200 + the number of nodes in the second to last layer of the frame stranding machine 200 + the number of nodes in the third to last layer of the frame stranding machine 200).

[0079] The second conductor layer 140 has three layers, and the second conductor layer 140 can be twisted using the number of nodes in the outermost layer, the number of nodes in the second-to-last layer, and the number of nodes in the third-to-last layer of the frame twisting machine 200. For example, in a 127-frame twisting machine, the number of nodes in the outermost layer is 36, the number of nodes in the second-to-last layer is 30, and the number of nodes in the third-to-last layer is 24.

[0080] First, the cross-sectional area S3 of the second conductor layer 140 is calculated. The calculation method of the cross-sectional area of ​​the second conductor layer 140 is the same as that in the first embodiment, and will not be repeated here.

[0081] After calculating the cross-sectional area S3 of the second conductor layer 140, the cross-sectional area S3 of the second conductor layer 140 is divided by the number of sections of the frame stranding machine 200 to calculate the cross-sectional area of ​​the second conductor 141 in the second conductor layer 140. Since the second conductor layer 140 has three layers, the 24th, 30th, and 36th sections of the frame stranding machine are required for stranding. Therefore, the number of second conductors 141 twisted twice is the sum of the number of sections in the outermost layer of the frame stranding machine 200, the number of sections in the second-to-last layer of the frame stranding machine 200, and the number of sections in the third-to-last layer of the frame stranding machine 200.

[0082] Therefore, when using a 127-bobbin frame stranding machine, the cross-sectional area of ​​the second conductive wire 141 is: S4 = (S2-S1) / (36+30+24).

[0083] It should be noted that the twisting directions of two adjacent second conductor layers 140 are opposite to each other. The twisting direction of the second conductor layer 140 closest to the optical fiber conductive layer 130 is opposite to that of the optical fiber conductive layer 130.

[0084] Therefore, the number of layers of the frame stranding machine 200 to be stranded can be selected according to the specific number of layers of the second conductor layer 140 , making the use of the frame stranding machine 200 more flexible.

[0085] It should be noted that the frame stranding machine 200 also includes a glue injection device, which is used to inject water-blocking glue between the center line 110 and the first conductor 121, between the first conductors 121, and between the first conductor 121 and the optical fiber conductive layer 130 during a single stranding process to improve the water-blocking properties of the submarine cable semi-finished product 100a.

[0086] FIG5 is a second flowchart of the submarine cable manufacturing method provided in an embodiment of the present application.

[0087] 5 , a stranding process is performed using a frame stranding machine 200 to strand the center line 110 , the first conductor layer 120 and the optical fiber conductive layer 130 of the submarine cable 100 . The process includes:

[0088] S103 , wrapping the optical fiber conductive layer 130 with two layers of first water-blocking tape 150 .

[0089] Specifically, after the first twisting, two layers of first water-blocking tape 150 can be applied to the outer surface of the optical fiber conductive layer 130 using the first binding tape wrapping device 700 (shown in FIG3 ) to further enhance the water-blocking properties of the semi-finished submarine cable 100a. Furthermore, the outer first water-blocking tape 150 can also provide protection for the inner first water-blocking tape 150.

[0090] S104 , heating the central line 110 , the first conductor layer 120 and the optical fiber conductive layer 130 .

[0091] Specifically, the center cable 110, first conductor layer 120, and optical fiber conductive layer 130 coated with the first water-blocking tape 150 are placed in a baking device for heating. This accelerates the solidification of the water-blocking adhesive within the semi-finished submarine cable 10a and prevents abnormalities such as bulging during the secondary twisting process. It should be noted that the outer surface of the optical fiber 131 can be wrapped with a layer of thermal insulation material to prevent heating from affecting the optical fiber 131.

[0092] FIG6 is a third flowchart of the submarine cable manufacturing method provided in an embodiment of the present application.

[0093] 6 , the process of using a frame stranding machine 200 to perform secondary stranding to strand the second conductor layer 140 of the submarine cable 100 includes: S105 , stripping the outer layer of the first water-blocking tape 150 .

[0094] Before the secondary twisting is performed, the first water-blocking tape 150 on the outer layer can be stripped off by a stripping machine 800 to avoid the water-blocking layer being too thick and thus reducing the effective conduction area in the submarine cable 100 .

[0095] In addition, after the secondary twisting, two layers of second water-blocking binding tape 160 may be wrapped around the second conductor layer 140 by a second binding tape wrapping device 900 (shown in FIG. 4 ).

[0096] FIG7 is a first structural diagram of a submarine cable provided in an embodiment of the present application.

[0097] As shown in Figure 7, an embodiment of the present application also provides a submarine cable 100, including a center line 110, a first conductor layer 120, an optical fiber conductive layer 130, a first water-blocking tape 150, a second conductor layer 140, a second water-blocking tape 160 and a protective layer 170, which are arranged in sequence from the inside to the outside of the radial direction R of the coastal cable 100, wherein the first conductor layer 120 is multi-layered, and each first conductor layer 120 includes a plurality of first conductors 121 arranged in sequence along the circumference C of the coastal cable, and the second conductor layer 140 is at least one layer, and each second conductor layer 140 includes a plurality of second conductors 141 arranged in sequence along the circumference C of the coastal cable 100.

[0098] The cross section of the submarine cable 100 is circular, and the submarine cable 100 includes a radial direction R and a circumferential direction C. The center line 110 is the axis of the submarine cable 100 , and the cross section of the center line 110 is also circular.

[0099] The first conductor layer 120 surrounds the center line 110. Multiple layers of first conductor layers 120 may be provided. In the embodiment shown in FIG7 , four layers of first conductor layers 120 are provided. Each first conductor layer 120 includes multiple first conductors 121, which are arranged sequentially along the circumference of each first conductor layer 120. The center line 110 and the first conductors 121 may be copper or aluminum wires and are used to transmit electrical signals.

[0100] The optical fiber conductive layer 130 is located outside the first conductor layer 120 . The optical fiber conductive layer 130 includes a plurality of optical fibers 131 . The plurality of optical fibers 131 are evenly spaced along the circumferential direction C. The optical fibers 131 are used to transmit optical signals.

[0101] The second conductor layer 140 is located outside the optical fiber conductive layer 130. A single second conductor layer 140 may be provided, or two or more second conductor layers 140 may be provided. In the embodiment shown in FIG7 , a single second conductor layer 140 is provided. The second conductor layer 140 includes a plurality of second conductors 141, which are arranged sequentially along the circumference. The second conductors 141 may be copper or aluminum wires and are used to transmit electrical signals. Compared to the related art, which only provides a first conductor layer, the embodiment of the present application, by providing both the first conductor layer 120 and the second conductor layer 140, can increase the cross-sectional area of ​​the conductors used to transmit electrical signals in the submarine cable 100, thereby improving the current carrying capacity of the submarine cable 100.

[0102] 7 , a first water-blocking tape 150 is provided between the second conductor layer 140 and the optical fiber conductive layer 130, and a second water-blocking tape 160 is further provided on the outside of the second conductor layer 140. That is, the submarine cable 100 has two layers of waterproofing measures. When the water-blocking property of the second water-blocking tape 160 decreases, only the transmission performance of the second conductor layer 140 is affected, while the first conductor layer 120 and the optical fiber conductive layer 130 can still operate normally. Thus, the reliability of the submarine cable 100 can be improved.

[0103] Continuing with Figure 7 , the outermost layer of submarine cable 100 is provided with a protective layer 170. Protective layer 170 may be multi-layered. For example, Figure 7 schematically illustrates protective layer 170 including a PE filling layer 171, a PP inner cushion layer 172, and an armored steel wire layer 173. The PE filling layer is made of polyethylene, and the PP inner cushion layer is made of polypropylene. Protective layer 170 is used to protect each layer of submarine cable 100.

[0104] Among them, the optical fiber 131 in the submarine cable 100 is relatively fragile. The protective layer 170 protects the optical fiber 131 and can provide better protection for the optical fiber 131 during the transportation and laying of the submarine cable 100. However, when the submarine cable 100 encounters anchor damage, the optical fiber 131 will still be damaged. In the embodiment of the present application, by arranging the second conductor layer 140 on the outside of the optical fiber conductive layer 130, the second conductor layer 140 can not only transmit electrical signals but also protect the optical fiber conductive layer 130, thereby further improving the reliability of the submarine cable 100. Among them, anchor damage refers to: due to the dragging or collision of the towline of a ship or other structure, the submarine cable will be excessively bent, causing the submarine cable to break or be otherwise damaged.

[0105] The submarine cable 100 provided in an embodiment of the present application comprises a centerline 110, a first conductor layer 120, an optical fiber conductive layer 130, a first water-blocking tape 150, a second conductor layer 140, a second water-blocking tape 160, and a protective layer 170. The first conductor layer 120 comprises multiple layers, each of which includes a plurality of first conductors 121 arranged sequentially along the circumference C of the cable. The second conductor layer 140 comprises at least one layer, each of which includes a plurality of second conductors 141 arranged sequentially along the circumference C of the cable 100. Compared to related art techniques that employ only a first conductor layer, the embodiment of the present application, by providing the first and second conductor layers 120 and 140, increases the cross-sectional area of ​​the conductors used to transmit electrical signals in the submarine cable 100, thereby improving the current carrying capacity of the submarine cable 100. The dual waterproofing measures of the first and second water-blocking tapes 150 and 160 in the submarine cable 100 enhance the reliability of the submarine cable 100. The second conductor layer 140 is disposed outside the optical fiber conductive layer 130 . The second conductor layer 140 not only transmits electrical signals but also protects the optical fiber conductive layer 130 , thereby further improving the reliability of the submarine cable 100 .

[0106] FIG8 is a first structural diagram of the first conductor in the submarine cable provided in an embodiment of the present application.

[0107] As shown in Figure 8, the first wire 121 is a trapezoid, the first short side 1211 of the first wire 121 faces the center line 110, the first long side 1212 of the first wire 121 faces away from the center line 110, and the first oblique sides 1213 of adjacent first wires 121 are in contact with each other; the distance between the first long side 1212 and the first short side 1211 is smaller than the distance between the two first oblique sides 1213.

[0108] The diameter of each layer of the submarine cable 100 gradually increases from the inside to the outside. The first conductor 121 is set to a trapezoidal shape, and the first short side 1211 of the first conductor 121 is directed toward the center line, and the first long side 1212 is directed away from the center line 110. This allows the structure of the first conductor 121 to better adapt to the gradually increasing diameter of the submarine cable 100 from the inside to the outside. In addition, the first oblique sides 1213 of adjacent first conductors 121 abut against each other. Compared with the first conductors 121 being circular in the related art, the area of ​​the vacant area in the submarine cable 100 can be reduced, thereby increasing the area of ​​the first conductive layer 120 in the submarine cable 100.

[0109] Continuing with FIG8 , the dimension of the first long side 1212 is L1, the length of the first short side 1211 is L2, the spacing between the first long side 1212 and the first short side 1211 is h1, and the spacing between the midpoints of the two first oblique sides 1213 is h2. Setting h1 to be smaller than h2 means that the first conductor 121 is a flat trapezoid. Setting the first conductor 121 to a flat trapezoid can avoid problems such as loose strands or poor water resistance caused by flipping the first conductor 121. In some embodiments, the first conductor 121 can be controlled to be a flat trapezoid using the formula L1-L2≥h1 / 2.

[0110] FIG9 is a first structural diagram of the second conductor in the submarine cable provided in an embodiment of the present application.

[0111] 7 and 9 , the second conductor 141 is trapezoidal, with the second short side 1411 of the second conductor 141 facing the center line 110, the second long side 1412 of the second conductor 141 facing away from the center line 110, and the second oblique sides 1413 of adjacent second conductors 141 abutting each other; the spacing between the second long side 1412 and the second short side 1411 is smaller than the spacing between the two second oblique sides 1413.

[0112] The second conductor 141 can also be set to a trapezoidal shape, with the second short side 1411 of the second conductor 141 facing the center line and the second long side 1412 away from the center line 110, so that the structure of the second conductor 141 can better adapt to the diameter of the submarine cable 100 that gradually increases from the inside to the outside. In addition, the second oblique sides 1413 of adjacent second conductors 141 abut against each other. Such an arrangement can reduce the area of ​​the vacant area in the submarine cable 100, thereby increasing the area of ​​the second conductor layer 140 in the submarine cable 100.

[0113] Continuing with FIG9 , the second long side 1412 has a size of L3, the second short side 1411 has a length of L4, the spacing between the second long side 1412 and the second short side 1411 is h3, and the spacing between the midpoints of the two second oblique sides 1413 is h4. Setting h3 to be smaller than h4 means that the second conductor 141 is a flat trapezoid. Setting the second conductor 141 to a flat trapezoid can avoid problems such as loose strands or poor water resistance caused by flipping the second conductor 141. In some embodiments, the second conductor 141 can be controlled to be a flat trapezoid using the formula L3-L4≥h3 / 2.

[0114] It should be noted that, referring to FIG. 8 and FIG. 9 , the four corners of the first conductive wire 121 and the second conductive wire 141 are chamfered, and the size of the chamfer can be 80° to 100°.

[0115] FIG10 is a second schematic structural diagram of a submarine cable provided in an embodiment of the present application; FIG11 is a second schematic structural diagram of a first conductor in a submarine cable provided in an embodiment of the present application.

[0116] 10 and 11 , the first conductor 121 is fan-shaped and includes a first inner arc 1214 and a first outer arc 1215 . The first inner arc 1214 faces the center line, and the first outer arc 1215 faces away from the center line. The two first sides 1216 of the first conductor 121 have first teeth 1216 a , and the first teeth 1216 a on the first sides 1216 of two adjacent first conductors 121 are meshed.

[0117] Compared with the trapezoidal shape, the fan-shaped ring is better adapted to the gradually increasing diameter of the submarine cable 100 from the inside to the outside, thereby reducing the area of ​​the vacant region in the submarine cable 100 and increasing the area of ​​the first conductive layer 120 in the submarine cable 100.

[0118] The first side 1216 has a first tooth portion 1216 a. In the embodiment shown in FIG. 10 and FIG. 11 , only one first tooth portion 1216 a is shown. The first tooth portions 1216 a on the first sides 1216 of two adjacent first conductive wires 121 engage with each other to prevent the first conductive wires 121 from flipping over.

[0119] FIG12 is a second structural schematic diagram of the second conductor in the submarine cable provided in an embodiment of the present application.

[0120] 10 and 12 , the second conductor 141 is fan-shaped and includes a second inner arc 1414 and a second outer arc 1415 . The second inner arc 1414 faces the center line, and the second outer arc 1415 faces away from the center line. The second side 1416 of the second conductor 141 has a second tooth portion 1416 a , and the second tooth portions 1416 a on the second side 1416 of two adjacent second conductors 141 are meshed.

[0121] Compared with the trapezoidal shape, the fan-shaped ring is better adapted to the gradually increasing diameter of the submarine cable 100 from the inside to the outside, thereby reducing the area of ​​the vacant region in the submarine cable 100 and increasing the area of ​​the first conductive layer 120 in the submarine cable 100.

[0122] The second side 1416 has a second tooth portion 1416 a. In the embodiments shown in FIG. 10 and FIG. 12 , only one second tooth portion 1416 a is shown. The second tooth portions 1416 a on the second sides 1416 of two adjacent second conductive wires 141 engage with each other to prevent the second conductive wires 141 from flipping over.

[0123] FIG13 is a third structural diagram of the submarine cable provided in an embodiment of the present application.

[0124] As shown in FIG. 13 , the first conductive wire 121 is in the shape of a fan ring having a first tooth portion 1216 a , and the second conductive wire 141 is in the shape of a trapezoid.

[0125] FIG14 is a fourth structural diagram of the submarine cable provided in an embodiment of the present application.

[0126] As shown in Figure 14 , the second conductor 141 is a sector ring with a second tooth portion 1416a, while the first conductor 121 is a trapezoid. In other words, the shapes of the first conductor 121 and the second conductor 141 can be the same or different. This is because the first conductor layer 120 and the second conductor layer 140 are twisted twice, and the shapes of the wires twisted twice can be different. Therefore, different wire shapes can be selected based on actual needs.

[0127] Next, the specific structure of the optical fiber conductive layer 130 will be described.

[0128] Figure 15 is a schematic diagram of the structure of an optical fiber filling layer in a submarine cable according to an embodiment of the present application; Figure 16 is a schematic diagram of the structure of a first filling section in a submarine cable according to an embodiment of the present application; and Figure 17 is a schematic diagram of the structure of a second filling section in a submarine cable according to an embodiment of the present application. Figure 16 also shows optical fiber 131 to clearly illustrate the coordination between optical fiber 131 and first filling section 1321.

[0129] Please continue to refer to Figures 15 to 17. The optical fiber conductive layer 130 also includes a plurality of filling segments 132. The plurality of optical fibers 131 and the plurality of filling segments 132 are spaced apart along the circumferential direction C of the coastal cable 100. The filling segments 132 include a first filling segment 1321 and a second filling segment 1322. Both sides of the optical fiber 131 are the first filling segments 1321. The first filling segment 1321 is in contact with the outer wall of the optical fiber 131 on the side facing the optical fiber 131. The plurality of second filling segments 1322 are arranged in sequence along the circumferential direction C on the side of the first filling segment 1321 away from the optical fiber 131. The first filling segment 1321 has a third tooth portion 1321a on the side away from the optical fiber 131, and both sides of the second filling segment 1322 have a fourth tooth portion 1322a. The third tooth portion 1321a is engaged with the fourth tooth portion 1322a adjacent to the third tooth portion 1321a, and the adjacent fourth tooth portions 1322a are engaged with each other.

[0130] The first filling segment 1321 and the second filling segment 1322 are both pre-formed filling segments. The first filling segment 1321 , the second filling segment 1322 and the optical fiber 131 are twisted together to form the optical fiber conductive layer 130 .

[0131] The filling segments 132 on both sides of the optical fiber 131 are first filling segments 1321 . The side of the first filling segment 1321 facing the optical fiber 131 fits with the outer wall of the optical fiber 131 to better protect the optical fiber 131 .

[0132] The third tooth portion 1321a meshes with the adjacent fourth tooth portion 1322a, thereby providing a good bonding force between the first filling segment 1321 and the second filling segment 1322. Adjacent fourth tooth portions 1322a also provide a good bonding force between adjacent second filling segments 1322.

[0133] In some embodiments, the first water-blocking tape 150 is wrapped in a butt-seam manner; and the second water-blocking tape 160 is wrapped in an overlapping manner.

[0134] A second conductor layer 140 is further provided on the outside of the first water-blocking tape 150 . The first water-blocking tape 150 is wrapped with a butt-seam method, which can avoid protrusions on the first water-blocking tape 150 , thereby causing the second wire 141 in the second conductor layer 140 to protrude along the circumferential direction C.

[0135] No conductive layer is provided on the outside of the second water-blocking tape 160, so the second water-blocking tape 160 is overlapped and wrapped, so that the submarine cable 100 can have better water-blocking performance. The overlap rate of the overlapped wrapping can be 25% to 30%.

[0136] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for manufacturing a submarine cable, characterized in that: include: A frame stranding machine is used to perform primary stranding to strand the center line, the first conductor layer and the optical fiber conducting layer of the submarine cable; The frame stranding machine is used to perform secondary stranding to strand the second conductor layer of the submarine cable, wherein the frame stranding machine used for the primary stranding and the secondary stranding is of the same specification.

2. The method for manufacturing a submarine cable according to claim 1, wherein: The method of using the frame stranding machine to perform secondary stranding to strand the second conductor layer of the submarine cable includes: when the second conductor layer is one layer, the cross-sectional area of ​​the second wire in the second conductor layer is: the cross-sectional area of ​​the second conductor layer / the number of nodes in the outermost layer of the frame stranding machine.

3. The method for manufacturing a submarine cable according to claim 1, wherein: The method of using the frame stranding machine for secondary stranding to strand the second conductor layer of the submarine cable includes: when the second conductor layer has two layers, the cross-sectional area of ​​the second wire in the second conductor layer is: the cross-sectional area of ​​the second conductor layer / (the number of nodes in the outermost layer of the frame stranding machine + the number of nodes in the second to last layer of the frame stranding machine).

4. The method for manufacturing a submarine cable according to claim 1, wherein: The use of the frame stranding machine for secondary stranding to strand the second conductor layer of the submarine cable includes: when the second conductor layer has three layers, the cross-sectional area of ​​the second wire in the second conductor layer is: the cross-sectional area of ​​the second conductor layer / (the number of nodes in the outermost layer of the frame stranding machine + the number of nodes in the second to last layer of the frame stranding machine + the number of nodes in the third to last layer of the frame stranding machine).

5. The method for manufacturing a submarine cable according to any one of claims 1 to 4, characterized in that: The method of using a frame stranding machine to perform a primary stranding to strand the center line, the first conductor layer and the optical fiber conducting layer of the submarine cable comprises: Wrapping the optical fiber conductive layer with two layers of first water-blocking tape; The center wire, the first conductor layer, and the optical fiber conductive layer are heated.

6. The method for manufacturing a submarine cable according to claim 5, characterized in that: The method of using the frame stranding machine to perform secondary stranding to strand the second conductor layer of the submarine cable includes: Peel off the first water-blocking tape from the outer layer.

7. A submarine cable, characterized in that: The submarine cable comprises a center line, a first conductor layer, an optical fiber conductive layer, a first water-blocking tape, a second conductor layer, a second water-blocking tape and a protective layer, which are arranged in sequence from the radial inside to the outside of the submarine cable, wherein the first conductor layer is multi-layered, and each layer of the first conductor layer comprises a plurality of first conductors arranged in sequence along the circumference of the submarine cable, and the second conductor layer is at least one layer, and each layer of the second conductor layer comprises a plurality of second conductors arranged in sequence along the circumference of the submarine cable.

8. The submarine cable according to claim 7, characterized in that The first conductive wire is trapezoidal, with a first short side of the first conductive wire facing the center line, a first long side of the first conductive wire facing away from the center line, and first oblique sides of adjacent first conductive wires abutting against each other; The distance between the first long side and the first short side is smaller than the distance between the two first oblique sides.

9. The submarine cable according to claim 7, characterized in that The second conductive wire is trapezoidal, the second short side of the second conductive wire faces the center line, the second long side of the second conductive wire faces away from the center line, and the second oblique sides of adjacent second conductive wires abut against each other; The distance between the second long side and the second short side is smaller than the distance between the two second oblique sides.

10. The submarine cable according to claim 7, characterized in that The first conductive wire is in a fan-shaped shape, and includes a first inner arc and a first outer arc, wherein the first inner arc faces the center line, and the first outer arc faces away from the center line; Two first sides of the first conductive wire have first teeth, and the first teeth on the first sides of two adjacent first conductive wires are meshed.

11. The submarine cable according to claim 7, characterized in that The second conductive line is in a fan-shaped shape, and includes a second inner arc and a second outer arc, wherein the second inner arc faces the center line, and the second outer arc faces away from the center line; The second side of the second conductive wire has a second tooth portion, and the second tooth portions on the second sides of two adjacent second conductive wires are meshed.

12. The submarine cable according to any one of claims 7 to 11, characterized in that: The optical fiber conductive layer includes a plurality of filling segments and a plurality of optical fibers, and the plurality of optical fibers and the plurality of filling segments are spaced apart along the circumference of the submarine cable; The filling segment includes a first filling segment and a second filling segment, both sides of the optical fiber are the first filling segment, and the first filling segment is in contact with the outer wall of the optical fiber on the side facing the optical fiber; Multiple second filling segments are arranged in sequence along the circumferential direction on the side of the first filling segment facing away from the optical fiber, the first filling segment has a third tooth portion on the side facing away from the optical fiber, and both sides of the second filling segment have a fourth tooth portion; the third tooth portion is meshed with the fourth tooth portion adjacent to the third tooth portion, and the adjacent fourth tooth portions are meshed.

13. The submarine cable according to any one of claims 7 to 11, characterized in that: The first water-blocking tape is wrapped in a butt-seam manner; the second water-blocking tape is wrapped in an overlapping manner.

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