CN111613376B - Submarine cable and preparation method thereof - Google Patents

Submarine cable and preparation method thereof Download PDF

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Publication number
CN111613376B
CN111613376B CN202010601004.0A CN202010601004A CN111613376B CN 111613376 B CN111613376 B CN 111613376B CN 202010601004 A CN202010601004 A CN 202010601004A CN 111613376 B CN111613376 B CN 111613376B
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China
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layer
armor
submarine cable
armor layer
layers
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CN111613376A (en
Inventor
张洪亮
严彦
胡明
闫志雨
于洪淼
李思宁
谢书鸿
薛建林
朱井华
张小龙
曹凯
花炜
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Zhongtian Technology Submarine Cable Co Ltd
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Zhongtian Technology Submarine Cable Co Ltd
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Priority to CN202010601004.0A priority Critical patent/CN111613376B/en
Priority to EP20919372.1A priority patent/EP3923303A4/en
Priority to PCT/CN2020/108526 priority patent/WO2021208304A1/en
Publication of CN111613376A publication Critical patent/CN111613376A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/1875—Multi-layer sheaths
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
    • H01B13/26—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/14—Submarine cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/22—Metal wires or tapes, e.g. made of steel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/22—Metal wires or tapes, e.g. made of steel
    • H01B7/226—Helicoidally wound metal wires or tapes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
    • H01B9/021—Features relating to screening tape per se
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
    • H01B9/022—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients composed of longitudinal lapped tape-conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables
    • H01B7/046—Flexible cables, conductors, or cords, e.g. trailing cables attached to objects sunk in bore holes, e.g. well drilling means, well pumps

Abstract

The submarine cable comprises a plurality of structural units and protective units, the protective units are arranged on the periphery of the structural units, each protective unit comprises an outer protective layer and an armor layer arranged on the periphery, the armor layers are located between the outer protective layers and the structural units, the armor layers are arranged in two layers, and the included angle between a monofilament of the armor layer on the inner layer and the axis of the submarine cable is larger than the included angle between a monofilament of the armor layer on the outer layer and the axis of the submarine cable or the included angle between the monofilaments of the armor layers on the two layers and the axis of the submarine cable is opposite in direction. According to the submarine cable, the gaps between the monofilaments on the two armor layers are axially different in angle or direction due to the fact that the monofilaments on the two armor layers are limited by the angle between the monofilaments and the central horizontal line, and high-strength protection is provided for the submarine cable.

Description

Submarine cable and preparation method thereof
Technical Field
The application relates to the technical field of submarine cable design, in particular to a submarine cable and a preparation method thereof.
Background
This section is intended to provide a background or context to the embodiments of the application that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.
High voltage alternating current, direct current submarine power cable is applicable to the ocean power transmission field, be different from land power cable, submarine cable delivery length can reach dozens or even hundreds of kilometers, transportation and construction after the production need be accomplished with the help of special construction ship, when the submarine cable is laid by ship to carrying out the submarine cable under water, submarine cable self gravity increases along with the deepening of depth of water, can cause the damage under the condition that exceeds submarine cable inner part mechanical bearing capacity, consequently, to axial mechanical tensile strength requirement higher during the submarine cable design, the outer armoring layer that satisfies axial atress requirement as of many metal wires windings that tensile strength is higher at present generally adopts the submarine cable sheath.
The armor layer is formed by twisting the metal wires with high tensile strength such as steel wires, copper wires or aluminum alloy, the requirement for axial tension during construction of the submarine cable can be effectively met, but the sealed external protection environment cannot be formed for the submarine cable in a multi-wire twisting mode, gaps among the metal wires form weak points in the long-term operation process of the submarine cable, and stones or sharp objects left in other ocean engineering on the seabed can damage the internal structure of the submarine cable from the gaps.
Disclosure of Invention
In view of the above, there is a need for an submarine cable that is protected from damage from sharp objects during its application.
The technical scheme provided by the application is as follows:
a submarine cable comprises a plurality of structural units and protective units, wherein the protective units are arranged on the peripheries of the structural units, each protective unit comprises an outer protective layer and an armor layer, the armor layers are located between the outer protective layers and the structural units, the armor layers are arranged in two layers, the included angle between the monofilament of the armor layer and the axis of the submarine cable on the inner layer is larger than the included angle between the monofilament of the armor layer and the axis of the submarine cable on the outer layer, or the twisting directions of the monofilaments of the armor layers are opposite.
In some embodiments of the present application, the monofilaments constituting the armor layer of the outer layer are metal wires having a circular or trapezoidal cross section, the monofilaments constituting the armor layer of the inner layer are metal wires having a circular or trapezoidal cross section or metal strips having a trapezoidal cross section, and when the monofilaments of the armor layer have a trapezoidal cross section, the ratio of the maximum width to the thickness of the monofilaments is 2: 1.
In some embodiments of the present application, both of the armor layers are formed by twisting metal wires having a trapezoidal or circular cross section, and an included angle between a monofilament of the armor layer at an outer layer and an axis of the submarine cable is 5.5-6.5 °
In some embodiments of the present application, the filaments of the armor layer at the inner layer are twisted in the same direction as the filaments of the armor layer at the outer layer, and the filaments of the armor layer at the inner layer form an angle of 8.8-10.3 ° with the axis of the submarine cable.
In some embodiments of the present application, the thickness of the filaments of the armor of the inner layer is h1The maximum width of the monofilament of the armor layer of the inner layer is d1The inner diameter of the structural unit is D, and the thickness of the monofilament of the armor layer on the outer layer is h2The maximum width of the monofilament of the armor layer at the outer layer is d2In, innerThe number of the single wires of the armor layer is as follows:
Figure GDA0002972039250000021
the number of the monofilaments of the armor layer on the outer layer is as follows:
Figure GDA0002972039250000022
in some embodiments of the present application, the monofilament constituting the armor layer of the inner layer is a metal tape, and the width of the overlapping portion of two adjacent metal tapes on the armor layer of the inner layer is 15% -20% of the width of the metal tape.
In some embodiments of the present application, the structural units are arranged in three, and three circumferential arrays of the structural units are arranged in the protection unit.
It is a further object of the present application to provide a method for preparing an ocean bottom cable, for preparing an ocean bottom cable as described above, comprising the steps of,
preparing a structural unit;
the armor layers are twisted, and the armor layers on the inner layer and the armor layers on the outer layer are arranged along the advancing direction of the structural unit respectively and are twisted;
and after the twisting is finished, coating the outer protective layer.
In some embodiments of the present application, two synchronous twisting devices are used to twist the outer side of the structural unit during twisting, and the twisting device of the inner armor layer has a rotation speed twice or the same as the rotation speed of the twisting device of the outer armor layer.
In some embodiments of the application, in the twisting process, the armor layer is wrapped around the outer periphery of the structural unit, and then the protection unit wrapped with the armor layer is placed into the outer layer twisting device of the armor layer.
Above-mentioned submarine cable, through the setting of double-deck armor to through the angle restriction between monofilament and the central water flat line on the two-layer armor, make on the two-layer armor gap between the monofilament present different angle or direction along the axial, can avoid having the condition in the gap between the monofilament that the gap enters into first armor easily when the sharp object enters into between the monofilament of second armor, provide the protection of higher intensity for the submarine cable.
Drawings
The present application will be described in further detail with reference to the following drawings and detailed description.
Fig. 1 is a schematic cross-sectional view of a submarine cable according to an embodiment of the present application.
FIG. 2 is a schematic cross-sectional view of a submarine cable according to another embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a submarine cable according to an embodiment of the present application.
Fig. 4 is a schematic structural diagram of a submarine cable according to another embodiment of the present application.
Fig. 5 is a schematic cross-sectional view of an armor layer monofilament in accordance with an embodiment of the present disclosure.
Fig. 6 is a schematic structural diagram of a submarine cable according to yet another embodiment of the present application.
Fig. 7 is a schematic structural diagram of a submarine cable preparation according to an embodiment of the present application.
Fig. 8 is a schematic structural view of a submarine cable according to another embodiment of the present application.
Description of the main element symbols:
submarine cable 100
Structural unit 10
Conductor 11
Inner semi-conductive shielding layer 12
Insulating layer 13
Outer semi-conductive shielding layer 14
Semi-conductive water-resistant layer 15
Metal shielding layer 16
Plastic protective layer 17
Protection unit 30
Binding belt 31
Light unit 311
Filling strip 313
Armor layer 32
First armor layer 321
Second armor layer 323
Monofilament yarn 3211
Outer protective layer 33
Stranding device 200
Detailed Description
In order that the above objects, features and advantages of the embodiments of the present application can be more clearly understood, a detailed description of the present application will be given below with reference to the accompanying drawings and detailed description. In addition, the features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth to provide a thorough understanding of embodiments of the application, and the described embodiments are merely a subset of embodiments of the application, rather than all embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiments of this application belong. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the present application.
The application provides a submarine cable, including a plurality of constitutional unit and protective unit, the protective unit sets up the constitutional unit periphery, the protective unit is including setting up outer jacket and the armor in the periphery, the armor is located the outer jacket reaches between the constitutional unit, the armor sets up to two-layer, inlayer the monofilament of armor with contained angle between submarine cable's the axis is greater than outer the monofilament of armor with contained angle or two-layer between submarine cable's the axis the monofilament of armor with contained angle opposite direction between submarine cable's the axis.
The application also provides a preparation method of the submarine cable, which is used for preparing the submarine cable and comprises the following steps:
preparing a structural unit;
stranding an armor layer: selecting two armor layers, arranging a stranding device of the armor layer on the outer layer and a stranding device of the armor layer on the inner layer along the advancing direction of the structural unit, and stranding;
and after the twisting is finished, coating the outer protective layer.
The submarine cable is characterized in that the submarine cable is provided with the double armor layers, and the angle between the monofilaments and the central horizontal line is limited on the two armor layers, so that gaps between the monofilaments on the two armor layers are different in angle or direction along the axial direction, the situation that sharp objects enter the gaps between the monofilaments of the first armor layer easily when the sharp objects have the gaps can be avoided, and the submarine cable is protected with higher strength.
The following detailed description will further describe embodiments of the present application in conjunction with the above-described figures.
Referring to fig. 1 and 2, a submarine cable 100 includes a plurality of structural units 10 and a protection unit 30, wherein the protection unit 30 is located at the periphery of the structural units 10 and is used for protecting the structural units 10.
Referring to fig. 1, in an embodiment, the structural unit 10 is provided as one, and the structural unit 10 includes a conductor 11, an inner semi-conductive shielding layer 12, an insulating layer 13, an outer semi-conductive shielding layer 14, a semi-conductive water blocking layer 15, a metal shielding layer 16, and a plastic protecting layer 17, which are sequentially disposed from inside to outside. The conductor 11 is used for carrying current, in an embodiment, the conductor 11 is a solid conductor 11, and in other embodiments, the conductor 11 may also be one of a round single-wire stranded conductor 11, a molded line conductor 11 and a split conductor 11. In one embodiment, the inner semi-conductive shielding layer 12 and the outer semi-conductive shielding layer are formed by extruded semi-conductive materials, the inner semi-conductive shielding layer 12 is used for eliminating electric field concentration on the surface of the conductor 11, preventing partial discharge caused by a gap generated between the insulating layer 13 and the conductor 11, the outer semi-conductive shielding layer 14 is used for uniform electric field, and preventing partial discharge caused by a gap generated between the insulating layer 13 and the metal shielding layer 16. The insulating layer 13 is made of light polyethylene to function as insulation. In one embodiment, the semi-conductive water-blocking layer 15 includes an annular corrugated metal sheath and a water-blocking material coated on an outer wall of the annular corrugated metal sheath. The metal shielding layer 16 is used to improve the electromagnetic interference resistance of the submarine cable 100, and in an embodiment, the metal shielding layer 16 is formed by winding a copper tape. The plastic sheath 17 is used for compression resistance, water resistance, moisture resistance and connection and disconnection protection, and in one embodiment, the plastic sheath 17 is a polyethylene sheath formed by extrusion. In another embodiment, referring to fig. 2, the number of the structural units 10 may also be three, and three of the structural units 10 are circumferentially arranged in the protection unit 30. In other embodiments, the structural unit 10 may be provided with other core numbers than three cores, and the light unit 311 may be added in the gap of the protection unit 30 according to functional requirements.
Referring to fig. 1, when the structural unit 10 is provided as one, the protection unit 30 includes an armor layer 32 and an outer sheath 33, the armor layer 32 is provided with two layers, the two layers of the armor layer 32 are attached to each other, the two layers of the armor layer 32 are respectively a first armor layer 321 disposed on an inner layer and a second armor layer 323 disposed on an outer layer, and the outer sheath 33 is sleeved on the periphery of the second armor layer 323. In one embodiment, two armor layers 32 are sleeved on the outer periphery of the plastic sheath 17 of the structural unit 10, and the inner wall of the first armor layer 321 is attached to the plastic sheath 17. Referring to fig. 2, when the number of the structural units 10 is three, the protection unit 30 further includes tie-up bands 31, the tie-up bands 31 are wrapped around the peripheries of the three structural units 10, and a plurality of filling strips 313 are filled in the tie-up bands 31, and the filling strips 313 are used for filling gaps between the structural units 10.
Referring to fig. 3 and 4, in an embodiment, the second armor layer 323 is formed by twisting monofilaments 3211, an included angle between the monofilaments 3211 of the second armor layer 323 and an axis is 5.5 ° to 6.5 °, and specifically, an included angle between the monofilaments 3211 of the second armor layer 323 and the axis may be one of 5.5 °, 5.6 °, 5.7 °, 5.8 °, 5.9 °, 6.0 °, 6.1 °, 6.2 °, 6.3 °, 6.4 °, and 6.5 °. Referring to fig. 5, in an embodiment, a monofilament 3211 constituting the armor layer 32 is a metal wire with a circular cross-section, and the metal wire has a diameter of 5.5 ± 0.5mm, specifically, the metal wire has a diameter of one of 5.0mm, 5.1mm, 5.2mm, 5.3mm, 5.4mm, 5.5mm, 5.6mm, 5.7mm, 5.8mm, 5.9mm, and 6.0 mm. In other embodiments, the monofilament 3211 constituting the armor layer 32 may also be a metal wire with a cross section, and the maximum width of the cross section of the metal wire is 7.0 ± 0.5mm, specifically, the maximum width of the monofilament 3211 with a cross section of the monofilament 3211 is one of 6.5mm, 6.6mm, 6.7mm, 6.8mm, 6.9mm, 7.0mm, 7.1mm, 7.2mm, 7.3mm, 7.4mm, and 7.5mm, and when the monofilament 3211 constituting the armor layer 32 is a metal wire with a trapezoidal cross section, the ratio of the maximum width of the cross section to the thickness of the monofilament 3211 is 2: 1.
In an embodiment, referring to fig. 3, an angle between the first armor layer 321 and an axis is greater than an angle between the second armor layer 323 and the axis, preferably, the angle between the first armor layer 321 and the axis is 8.8 ° to 10.3 °, and specifically, the angle between the first armor layer 321 and the axis may be one of 8.8 °, 8.9 °, 9.0 °, 9.1 °, 9.2 °, 9.3 °, 9.4 °, 9.5 °, 9.6 °, 9.7 °, 9.8 °, 9.9 °, 10.0 °, 10.1 °, 10.2 °, and 10.3 °.
And when the included angle between the first armor layer 321 and the axis is larger than the included angle between the second armor layer 323 and the axis, the number of the monofilaments 3211 of the armor layer 32 in the inner layer is as follows:
Figure GDA0002972039250000071
the number of the monofilaments 3211 of the armor layer 32 on the outer layer is as follows:
Figure GDA0002972039250000072
wherein D is the inner diameter of the structural unit 10 and D1Is the maximum width of the monofilament 3211 of the armor 32 in the inner layer, h1Is the thickness of the monofilament 3211 of the armor 32 in the inner layer, d2Is the maximum width of the monofilament 3211 of the armor 32 at the outer layer, h2Is the thickness of the monofilament 3211 of the armor 32 at the outer layer.
In other embodiments, referring to fig. 4, the sum of the angle between the filament 3211 of the first armor layer 321 and the axis and the angle between the filament 3211 of the second armor layer 323 and the axis is equal to 180 °, and the cross-section of the metal filament 3211 constituting the first armor layer 321 is one of circular and trapezoidal. The number of the monofilaments 3211 of the armor layer 32 in the inner layer is as follows:
Figure GDA0002972039250000081
the number of the monofilaments 3211 of the armor layer 32 on the outer layer is as follows:
Figure GDA0002972039250000082
referring to fig. 6, in other embodiments, the single wires forming the second armor layer 323 are metal wires, the single wires forming the first armor layer 321 are metal tapes, the metal tapes are wrapped to form the first armor layer 321, and an overlapping portion of two adjacent layers of the metal tapes forming the first armor layer 321 is 15% -20% of a width of the metal tapes. In one embodiment, the width of the metal tape comprising the first armor 321 is 10 times the maximum width of the filaments 3211 of the second armor 323, and the thickness of the metal tape is 1/2 times the maximum width of the filaments 3211 of the second armor 323.
The outer sheath 33 is used for protecting the submarine cable 100 during transportation and deep burying, and in one embodiment, the outer sheath 33 is made of polypropylene, polyethylene, polyvinyl chloride, or the like, and is wound or directly extruded.
Another object of the present invention is to provide a method for preparing a submarine cable 100, referring to fig. 7 and 8, comprising the following steps:
s1: preparation of the structural unit 10:
specifically, the conductor 11 is stranded, and the inner semiconductive shielding layer 12, the insulating layer 13 and the outer semiconductive shielding layer 14 are stranded layer by layer outside the conductor 11, in an embodiment, the inner semiconductive shielding layer 12, the insulating layer 13 and the outer semiconductive shielding layer 14 are formed by three layers of co-extrusion; semiconductive water barrier 15 is then extruded over outer semiconductive shield 14 and wrapped around to form metallic shield 16, and finally protective element 30 is extruded.
In other embodiments, after the protection unit 30 is molded, the structural units 10 are twisted, and the gaps between the structural units 10 are filled with the filling bars 313, and then the binding tapes 31 are wrapped around the outer circumference of the structural units 10.
S2: stranding an armor layer: selecting two armor layers 32, arranging and twisting the twisting device of the second armor layer 323 and the twisting device 200 of the first armor layer 321 along the advancing direction of the structural unit 10, and twisting;
in an embodiment, the two armor layers 32 are formed by twisting single wires 3211, the twisting device 200 for twisting the armor layers 32 is a strand, two synchronous strands are twisted outside the structural unit 10 during twisting, and the rotation speed of the strand of the first armor layer 321 is twice the rotation speed of the strand of the second armor layer 323.
In another embodiment, the armor 32 strands rotate at the same speed.
Specifically, in the production process, the number of the first armor layer 321 and the second armor layer 323 is calculated according to a calculation formula, and during twisting, the monofilaments 3211 advance along a positioning channel in a twisting body from a plurality of monofilament coils placed on the twisting body and are gathered at a twisting port, and meanwhile, the twisting body rotates anticlockwise along an axis in the advancing direction of the cable, and the monofilaments 3211 are wound on the cable passing through the twisting port. In production, the structural unit 10 firstly enters a strand of a first armor layer 321, monofilaments 3211 of the first armor layer 321 are uniformly twisted and coated on the structural unit 10, then the monofilaments enter a strand of a second armor layer 323, and the monofilaments 3211 of the second armor layer 323 are uniformly twisted and coated on the first armor layer 321. The structural unit 10 passes through the two strands to complete the production of the double-layer armor layer. In another embodiment, referring to fig. 8, the first armor layer 321 is formed by wrapping a metal tape around the outer circumference of the structural unit 10.
Specifically, in the production process, the structural unit 10 firstly enters the first armor layer 321 wrapping machine during production, and enters the strand body of the second armor layer 323 after the metal tape is wrapped. Firstly, the first armor layer 321 is wrapped on the periphery of the structural unit 10, and in the wrapping process, the lapping proportion of the wrapping is controlled to be 15% -20% of the width. The protection unit 30 covered with the armor layer 32 at the inner layer is put into the stranding device 200 of the armor layer 32 at the outer layer.
S3: coating the outer sheath 33:
specifically, the high-strength fiber rope is twisted outside the armor layer to form the outer protective layer 33, or a plastic extruded protective layer can be used.
The application provides a submarine cable 100, setting through double-deck armor 32, and through the angle restriction between monofilament 3211 and the central horizontal line on the two-layer armor 32, make on the two-layer armor 32 the gap between monofilament 3211 present different angle or direction along the axial, can avoid having the condition in the gap between the monofilament 3211 that the gap enters into second armor 323 at sharp thing easily enters into the gap between the monofilament 3211 of first armor 321, the protection of higher strength is provided for the submarine cable, and simultaneously, can satisfy the use needs when the submarine cable does not have special or extra protection under the complicated sea area environment, need carry out work such as secondary landfill when reducing conventional engineering to complicated sea area operating mode, heavy object protection and robot protection, obviously save the cost input of submarine cable engineering.
Although the embodiments of the present application have been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the embodiments of the present application.

Claims (9)

1. A submarine cable comprising a structural unit and a protective unit, the protective unit being disposed around the structural unit, characterized in that: the protection unit comprises an outer protective layer and an armor layer, the armor layer is located between the outer protective layer and the structural unit, the armor layer is arranged into two layers, the included angle between the monofilament of the armor layer at the inner layer and the axis of the submarine cable is larger than the included angle between the monofilament of the armor layer at the outer layer and the axis of the submarine cable, the included angle between the monofilament of the armor layer at the outer layer and the axis of the submarine cable is 5.5-6.5 degrees, the included angle between the monofilament of the armor layer at the inner layer and the axis of the submarine cable is 8.8-10.3 degrees, and the thickness of the monofilament of the armor layer at the inner layer is h1The maximum width of the single wire of the armor layer of the inner layer is d1The outer diameter of the structural unit is D, and the number of the armor layers of the inner layer is D
Figure FDA0002972039240000011
；
The thickness of the single wire of the armor layer at the outer layer is h2The maximum width of the single wire of the armor layer at the outer layer is d2The number of the armor layers on the outer layer is as follows:
Figure FDA0002972039240000012
。
2. submarine cable according to claim 1, wherein: the single wires forming the armor layer on the outer layer are metal wires with round or trapezoidal sections, the single wires forming the armor layer on the inner layer are metal wires with round or trapezoidal sections or metal strips, and when the single wires of the armor layer are trapezoidal sections, the ratio of the maximum width to the thickness of the single wires is 2: 1.
3. Submarine cable according to claim 2, wherein: the two armor layers are formed by twisting metal wires with trapezoidal or circular sections.
4. Submarine cable according to claim 3, wherein: the single wires of the armor layer on the inner layer and the single wires of the armor layer on the outer layer have the same twisting direction.
5. Submarine cable according to claim 2, wherein: the monofilament forming the armor layer of the inner layer is a metal belt, and the width of the overlapping part of two adjacent layers of metal belts on the armor layer of the inner layer is 15% -20% of the width of the metal belt.
6. Submarine cable according to claim 1, wherein: the number of the structural units is three, and the three structural units are arranged in the protection unit in a circumferential array.
7. A method of preparing an ocean cable for use in preparing the ocean cable according to claim 1, wherein: comprises the following steps of (a) carrying out,
preparing a structural unit;
the armor layers are twisted, and the armor layers on the inner layer and the armor layers on the outer layer are arranged along the advancing direction of the structural unit respectively and are twisted;
and after the twisting is finished, coating the outer protective layer.
8. A method of manufacturing a submarine cable according to claim 7, wherein: in the twisting process, two synchronous twisting devices are twisted outside the structural unit, and the rotating speed of the twisting device of the armor layer on the inner layer is twice of that of the twisting device of the armor layer on the outer layer or the rotating speeds of the twisting devices of the inner armor layer and the outer armor layer are the same.
9. A method of manufacturing a submarine cable according to claim 7, wherein: in the twisting process, the armor layer on the inner layer is wrapped on the periphery of the structural unit, and then the protection unit coated with the armor layer on the inner layer is placed into the twisting device of the armor layer on the outer layer.
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