CN113437704A - Submarine cable underwater repairing method and submarine cable - Google Patents
Submarine cable underwater repairing method and submarine cable Download PDFInfo
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- CN113437704A CN113437704A CN202110660742.7A CN202110660742A CN113437704A CN 113437704 A CN113437704 A CN 113437704A CN 202110660742 A CN202110660742 A CN 202110660742A CN 113437704 A CN113437704 A CN 113437704A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/16—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for repairing insulation or armouring of cables
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G9/00—Installations of electric cables or lines in or on the ground or water
- H02G9/02—Installations of electric cables or lines in or on the ground or water laid directly in or on the ground, river-bed or sea-bottom; Coverings therefor, e.g. tile
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- Electric Cable Installation (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
Abstract
An underwater submarine cable restoration method comprises the following steps: cutting a metal wire to be repaired in the submarine cable protective layer to reserve a repairing space; connecting the connecting pieces with the metal wires to be repaired in a one-to-one corresponding manner; the connecting piece is partially overlapped with the metal wire, and the connecting piece is connected with the metal wire in a bolt connection mode; or the end part of the connecting piece is opposite to the end part of the metal wire, the connecting piece is connected with the metal wire in a cold pressure welding mode, and the compression joint direction is the axial direction of the connecting piece. According to the submarine cable underwater repairing method, the connecting pieces are connected with the metal wires in a one-to-one correspondence mode through a cold-pressing welding mode or a bolt connecting mode, the repairing process can be directly carried out underwater, the original mechanical performance of the repaired metal wires can be guaranteed, and the cost and the maintenance period in the repairing process can be reduced. The application also provides a submarine cable applying the repairing method.
Description
Technical Field
The application relates to the technical field of submarine cables, in particular to an underwater submarine cable repairing method and a submarine cable repaired by the method.
Background
With the rapid development of offshore activities such as offshore wind power generation, offshore oil and gas and the like, the application of submarine cables becomes more and more extensive, but the submarine cables also have more problems, such as failure and social negative influence, which can affect the use of submarine cables and even stop running, and thus great economic loss can be caused. Data statistics shows that 95% of submarine cable damage is caused by activities such as fishery and shipping, mainly caused by external force damage caused by fishing gear, ship anchors and the like.
In the special environment of the sea bottom, the submarine cable is mainly damaged by external force in the mechanical aspect, so the armor metal wires in the submarine cable protective layer are firstly damaged, thereby the protective performance of the submarine cable is reduced, and the service life of the submarine cable is prolonged. The existing submarine cable damage repairing method mainly comprises the steps of salvaging a damaged submarine cable, and then placing the submarine cable on a ship for repairing, wherein the ship needs to be used for salvaging and maintaining no matter the electrical performance or the mechanical performance of the submarine cable is in a problem; if only the armoured wire takes place to damage and insulating sinle silk does not take place to damage, the maintenance cost greatly increased can be made to the use of a large amount of boats and ships, salvages the excision with normal insulating sinle silk simultaneously, then reconnects the risk that has also increased insulating maintenance.
Disclosure of Invention
In view of the above situation, the present application provides an underwater submarine cable repairing method and a submarine cable repaired by using the method, wherein the connecting members and the metal wires are connected in a one-to-one correspondence manner through a cold-press welding manner or a bolt connection manner, and the repairing process can be directly performed underwater, so that the original mechanical properties of the repaired metal wires can be ensured, and the cost and the maintenance period in the repairing process can be reduced.
The embodiment of the application provides an underwater submarine cable repairing method, which comprises the following steps: cutting a metal wire to be repaired in the submarine cable protective layer to reserve a repairing space; connecting the connecting pieces with the metal wires to be repaired in a one-to-one corresponding manner; the connecting piece is partially overlapped with the metal wire, and the connecting piece is connected with the metal wire in a bolt connection mode; or the end part of the connecting piece is opposite to the end part of the metal wire, the connecting piece is connected with the metal wire in a cold pressure welding mode, and the compression joint direction is the axial direction of the connecting piece.
In some embodiments, the step of connecting the connector to the wire by bolting comprises: the two ends of the metal wire at the fracture are provided with first holes, the two ends of the connecting piece are provided with second holes corresponding to the first holes, and the first holes and the second holes are coaxially arranged; a bolt assembly extends through the first and second holes and locks the overlapping portions of the connector and the wire.
In some embodiments, the bolt assembly includes a bolt body and a fastener, the bolt body extends through the first hole and the second hole, the fastener is disposed at an end of the bolt body and abuts against a surface of the connecting member, and the bolt body is subjected to a pre-tightening force when installed.
In some embodiments, the diameter of the first hole is 4-6mm, the distance between two adjacent first holes is at least 8mm, and the distance between the first holes and the end edge of the wire is at least 10 mm.
In some embodiments, the length of the overlapping area of one end of the connecting member 40 and the wire is greater than or equal to 28mm along the extension direction of the wire.
In some embodiments, the pressure range for the cold pressure weld is 500-.
In some embodiments, the subsea cable repair method further comprises the steps of: and winding a plurality of insulating ropes on the surface of the submarine cable, and coating the connecting piece and the metal wire to form an outer protective layer.
The embodiment of the application still provides a submarine cable, the submarine cable repair method under water of above-mentioned embodiment use in this submarine cable, the submarine cable includes core, insulating sheath, inoxidizing coating and outer jacket, insulating sheath locates the surface of core, the inoxidizing coating cladding insulating sheath, the inoxidizing coating includes a plurality of wires and connecting piece, the connecting piece is connected the wire that treats the restoration.
In some embodiments, the wire connector further comprises a bolt assembly, the cross-sectional shape of the wire is rectangular, the cross-sectional width of the wire is 6-8mm, the cross-sectional thickness of the wire is 2-3mm, the connector is partially overlapped with the wire, and the bolt assembly penetrates through and locks the overlapped part of the connector and the wire.
In some embodiments, the cross-sectional shape of the metal wire is circular, the diameter of the metal wire is 3-6mm, the material and the cross-sectional shape of the connecting member are the same as those of the metal wire, the metal wire and the connecting member are connected by cold pressure welding, and the pressure range of the cold pressure welding is 500-1000 Mpa.
The submarine cable underwater repairing method provided by the application enables the connecting pieces to be connected with the metal wires in a one-to-one correspondence mode through a cold-pressing welding mode or a bolt connecting mode, the repairing process can be directly performed underwater, the original mechanical performance of the repaired metal wires can be guaranteed, and the cost and the maintenance period in the repairing process can be reduced.
Drawings
Fig. 1 is a schematic structural diagram of a submarine cable in one embodiment.
Fig. 2 is an enlarged view of a portion of the submarine cable shown in fig. 1.
Fig. 3 is a schematic cross-sectional view of the structure of fig. 2 after the connecting member is connected to the wire.
Fig. 4 is a schematic structural diagram of a submarine cable in one embodiment.
Fig. 5 is an enlarged view of a portion of the submarine cable shown in fig. 4.
Fig. 6 is a schematic view showing a connection structure of the connecting member and the wire in the structure shown in fig. 5.
FIG. 7 is a flow diagram of a subsea cable repair method in one embodiment.
Description of the main element symbols:
| |
100 |
| |
10 |
| Insulating |
20 |
| |
30 |
| |
31 |
| |
311 |
| Connecting |
40 |
| |
41 |
| Bolt assembly | 42 |
| |
421 |
| Fastening |
422 |
| |
423 |
| Outer |
50 |
The specific implementation mode is as follows:
the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
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 this application belongs. 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 application. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.
The application provides an underwater submarine cable repairing method, which comprises the following steps: cutting a metal wire to be repaired in the submarine cable protective layer to reserve a repairing space; connecting the connecting pieces with the metal wires to be repaired in a one-to-one corresponding manner; the connecting piece is partially overlapped with the metal wire, and the connecting piece is connected with the metal wire in a bolt connection mode; or the end part of the connecting piece is opposite to the end part of the metal wire, the connecting piece is connected with the metal wire in a cold pressure welding mode, and the compression joint direction is the axial direction of the connecting piece.
According to the submarine cable repairing method, the connecting pieces and the metal wires are connected in a one-to-one correspondence mode through a cold-pressing welding mode or a bolt connecting mode, the repairing process can be directly carried out underwater, the original mechanical performance of the repaired metal wires can be guaranteed, and the cost and the maintenance period in the repairing process can be reduced.
Some embodiments of the present application are described in detail. In the following embodiments, features of the embodiments may be combined with each other without conflict.
Referring to fig. 1 to 7, in one embodiment, a submarine cable 100 includes a core 10, an insulating sheath 20, a protective layer 30, and an outer sheath 50. An insulating sheath 20 is provided on the outer surface of the core 10. The protective layer 30 covers the insulating sheath 20, and the protective layer 30 includes a plurality of metal wires 31, so as to implement armor protection of the submarine cable 100 and improve mechanical properties of the submarine cable 100. The outer sheath is disposed on the outer surface of the protective layer 30 and is the outermost structure of the submarine cable 100. The submarine cable repair method according to the embodiment of the present invention is applied to the submarine cable 100 described above to repair the protective layer 30 and the outer jacket 50 of the submarine cable 100. The submarine cable repairing method comprises the following steps:
s1: and cutting the metal wire to be repaired in the submarine cable protective layer to reserve a repairing space.
Specifically, when the submarine cable 100 is mechanically damaged, the protective layer 30 and the outer sheath 50 are damaged. And (3) directly cutting the damaged parts of the outer protective layer 50 and the protective layer 30 underwater, and carding the metal wires to be repaired in the protective layer 30.
S2: and connecting the connecting pieces with the metal wires to be repaired in a one-to-one correspondence manner, and repairing the protective layer of the submarine cable.
Specifically, the material of the connecting member 40 is the same as that of the wires 31, and a connecting member 40 is connected to a fracture of each of the wires 31 to be repaired. The connection of the connecting member 40 to the wire 31 is performed directly under water without fishing out the submarine cable 100. In one embodiment of the present application, the end of the connecting member 40 is partially overlapped with the end of the wire 31 in the thickness direction, the connecting member 40 and the wire 31 are drilled in the overlapped region, and then a bolt assembly 42 is disposed in the hole to connect the connecting member 40 and the wire 31 by means of a bolt connection, thereby repairing the wire 31 to be repaired. Or, in one embodiment of the present application, the end of the connecting member 40 is opposite to the end of the metal wire 31, and pressure is applied to the joint of the connecting member 40 and the metal wire 31 along the axial direction of the connecting member 40, so that the joint of the connecting member 40 and the metal wire 31 generates radial plastic deformation, a metal welding seam in tight contact is formed, and the connecting member 40 and the metal wire 31 are connected in a cold pressure welding manner, thereby achieving the purpose of repairing the broken metal wire 31.
S3: and repairing the outer protective layer to cover the connecting piece and the metal wire.
Specifically, outer jacket 50 comprises a plurality of insulating strands including, but not limited to, polypropylene strands and the like. The insulating cord is wound around the outer surface of the protective layer 30 and completely covers the protective layer 30 to form the outer sheath 50. After the connecting piece 40 and the metal wire 31 to be repaired are connected, one end of each insulating rope stretches into the outer protective layer 50 at the damaged position, then the insulating ropes are uniformly wound on the surface of the submarine cable 100 until the damaged position of the outer protective layer 50 is covered, so that the connecting piece 40 and the metal wire 31 are all wrapped in the outer protective layer formed by the insulating ropes, and then the waterproof adhesive tapes are used for bonding and fixing the insulating ropes to complete the repairing process of the outer protective layer 50.
The connection of the connecting member 40 to the wire 31 will be described in detail with reference to the following embodiments.
Referring to fig. 1, 2 and 3, in one embodiment, the metal wires 31 in the protective layer 30 are flat metal wires with a substantially rectangular cross-section. The width of the wire 31 is in the range of 6-8mm and the thickness is in the range of 2-3 mm. The tensile strength and elongation test of the flat metal wire should meet the regulations of GB/T4909.3-2009, the original gauge length of the flat metal wire is 250mm, the length of a test sample is 300mm, and the drawing speed is 200 mm/min. The specification for the flat wire is shown in table 1.
TABLE 1 Flat wire technical requirements
In the embodiment of the present application, the material of the wire 31 is copper or a copper alloy, and the width dimension is preferably 7.5mm and the thickness dimension is preferably 2.5 mm. The flat wire test results are shown in table 2 below. In other embodiments, the metal wire 31 may also be made of other materials with good mechanical properties and corrosion resistance, so as to meet the use requirement, which is not limited in the present application.
TABLE 2 Flat wire test results
In the present embodiment, the material and the cross-sectional structure of the connecting member 40 are the same as those of the wire 31, and the length of the connecting member 40 is greater than the fracture length of the wire 31 to be repaired. To meet the installation requirements, the length of the connecting member 40 is at least 100 mm. Before the wire 31 is connected to the connecting member 40, the first holes 311 are formed at both ends of the cut of the wire 31. The diameter of the first hole 311 is 4-6 mm. In this embodiment, the number of the first holes 311 is four, and the first holes 311 are symmetrically disposed at two ends of the broken portion of the wire 31, that is, two first holes 311 are disposed at each end of the wire 31. The distance between two adjacent first holes 311 is at least 8mm, so that the problem of stress concentration caused by too small distance between the holes is reduced. The first hole 311 is at least 10mm away from the end edge of the wire 31 in the direction of extension of the wire 31 to reduce stress concentration problems between the hole and the end boundary due to too small a distance. Gold edgeThe length of the overlapping area of one end of the connecting piece 40 and the metal wire 31 is L, wherein L is more than or equal to 28mm, so that the area of the overlapping area of one end of the connecting piece 40 and the metal wire 31 is at least 210mm2So as to improve the mechanical strength of the joint of the connecting piece 40 and the metal wire 31 and reduce the problem of fracture of the joint. In other embodiments, the number of the first holes 311 may be more or less than four, which is sufficient for the design requirement, and the present application is not limited thereto.
When the connecting member 40 is connected to the wire 31, the opposite ends of the connecting member 40 are provided with second holes 41 corresponding to the first holes 311. The number of the second holes 41 corresponds to the number of the first holes 311 one by one. The diameter of the second hole 41 is the same as the diameter of the first hole 311. When the end of the connecting member 40 is disposed to overlap the end of the wire 31 in the thickness direction of the wire 31, the second hole 41 is disposed coaxially with the first hole 311. The bolt assembly 42 includes a bolt body 421 and a fastener 422. The bolt body 421 penetrates both the first hole 311 and the second hole 41 to connect the wire 31 and the connection member 40. The fastening member 422 is coupled to the end of the bolt body 421 and pressed against the surface of the connecting member 40 to closely attach the wire 31 to the connecting member 40, thereby locking the overlapped portions of the wire 31 and the connecting member 40. Further, the bolt assembly 42 may further include a washer 423, and the washer 423 is disposed between the surface of the connecting member 40 and the fastening member 422 for preventing the fastening member 422 from being loosened. When the bolt assembly 42 is installed at the joint of the connecting member 40 and the metal wire 31, the bolt main body 421 is under tension, and the gap between the bolt main body 421 and the first hole 311 and the second hole 41 is kept unchanged under tension, so that the shaking of the bolt main body 421 is reduced, the stability of the joint of the connecting member 40 and the metal wire 31 is improved, the repairing quality is improved, and the service life of the submarine cable 100 is prolonged.
When the bolt assembly 42 is installed, the bolt main body 421 is pre-tensioned F/Acting to avoid the bolt body 421 being subjected to shear forces while being subjected to tension forces. In the embodiment of the present application, the bolt body 421 is a copper bolt, model M5, yield strength 375MPa, and cross-sectional area 14.2mm2. In other embodiments, the bolt body 421 can be made of other materialsAnd the size, the yield limit can be more than 375MPa, and the design requirement can be met, and the application is not limited to the method. Pretightening force F/The calculation method of (a) is as follows:
F/＝(0.6～0.7)σ·S
in the formula: sigma-the yield limit of copper bolts, in megapascals (MPa);
s-is the cross-sectional area of the copper bolt in square millimeter (mm)2)。
Pretightening force F/The maximum value of (d) is 0.8 σ · S.
The pretightening force F borne by the bolt main body 421 can be calculated by the above formula/Is 3195 and 3727N, and the maximum value is 4260N.
During the operation of the submarine cable, the bolt body 421 is loaded by an external load FR. Because the bolt main body 421 is pre-tensioned during installation, the joint surface between the connecting piece 40 and the metal wire 31 generates friction force under the clamping force of the bolt assembly 42, and the friction force generated by the clamping force and the external load FRBalance, when the bolt main body is not subjected to external force under the action of pretightening force, pretightening force F/With external load FRThe relationship between them is as follows:
in the formula: f/-pretension in newtons (N);
Kfthe reliability coefficient is generally 1.1-1.4;
FR-external load in cattle (N);
z is the number of bolts;
μs-the joint surface friction coefficient, 0.2;
m is the number of bonding surfaces.
Combining the calculation result of the pretightening force, the external load F when the bolt main body 421 is not subjected to the external force can be calculated by the above formulaR1549N.
Bolt main part 421 is in the effect that has both received the pretightning force and have the work pulling force again in the actual application, so when bolt main part 421 receives work load F, the following formula is drawn to the stress amplitude of bolt:
in the formula: f is external force, and the unit is Newton (N);
d-bolt diameter in millimeters (mm);
σathe stress amplitude is given in Mega pascals (MPa).
[σa]Allowable stress amplitude in megapascals (MPa).
Allowable stress amplitude [ sigma ]a]The calculation formula is as follows:
in the formula: sigma-yield limit of copper bolt.
The allowable stress amplitude of the bolt main body 421 can also be calculated to be 107.14MPa to 125MPa through the formula, and the external load F which can be borne by the bolt main body 421 can be further calculated to be less than or equal to (14017N to 245931N), and the mechanical strength of the bolt main body 421 is obviously larger than that of the flat wire according to the technical requirements and the test conditions of the flat wire.
In this embodiment, after the metal wire 31 to be repaired is connected to the connecting member 40 for repair, the repair test results are shown in table 3 below. The overall length of the repair assembly to be tested was 300mm and the test pull rate was 200 mm/min.
TABLE 3 Flat copper wire repair test results
After the test is finished, the tensile strength of the repairing assembly is basically stabilized at about 5800N, which is about 85% of the required value, and the technical requirements of the repaired metal wire and the normal operation conditions of the submarine cable can be basically met.
Referring to fig. 4, 5 and 6, in one embodiment, the metal wires 31 in the protective layer 30 are round metal wires with a substantially circular cross-sectional shape. The diameter of the round metal wire is 3-6 mm. The connecting member 40 has the same sectional shape and material as the round wire. When the metal wire 31 to be repaired and the connecting piece 40 are directly connected by cold-pressure welding under water, two ends of the connecting piece 40 are respectively arranged opposite to two ends of a fracture of the round metal wire to be repaired, and then one end of the round metal wire to be repaired and one end of the connecting piece 40 are respectively fastened in a clamping component of cold welding equipment and extend out by proper length. The length of the wire 31 extending out of the clamping assembly is at least 15 mm. After the position of the connecting piece 40 or the metal wire 31 is adjusted to align the connecting piece 40 with the end of the metal wire 31, the cold welding equipment applies pressure along the axial direction of the connecting piece 40, so that the connecting part of the connecting piece 40 and the metal wire 31 generates radial plastic deformation, a metal welding seam in close contact is formed, and cold-pressing connection between the connecting piece 40 and the metal wire 31 is realized. The two ends of the connecting member 40 may be sequentially connected to the metal wire 31 to be repaired using one cold welding apparatus, or two cold welding apparatuses may be simultaneously pressed against the two ends of the connecting member 40. In the present embodiment, the pressure range for cold pressure welding is 500-1000 MPa. Cold welding equipment includes, but is not limited to, hand held cold welders. After the cold pressure welding is completed, the weld between the connecting piece 40 and the metal wire 31 can be polished to improve the surface quality of the repaired metal wire 31.
The embodiment of the application repairs the round metal wire in a crimping mode, can ensure that the joint of the connecting piece and the metal wire has the shock resistance, the corrosion resistance and the like of the original round metal wire, and is simple and convenient in operation process. After the compression joint is finished, the metal wire at the joint is polished, the surface state of the original round metal wire is basically ensured, and the submarine cable repairing part is more round and beautiful. Aiming at the flat metal wire, the embodiment of the application is repaired in a bolt connection mode, the connection strength of the connection mode is stable and reliable, in addition, the bolt connection structure is simple, the assembly and disassembly are convenient, the limitation of materials of connected pieces is avoided during the use, and the assembly and disassembly can be carried out for many times.
The submarine cable underwater repairing method makes different countermeasures for different metal wires to repair, original mechanical performance of the repaired metal wires can be guaranteed through mechanical compression joint and bolt connection, and cost and maintenance period in the repairing process can be reduced.
Although the present application has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the present application.
Claims (10)
1. An underwater submarine cable restoration method is characterized by comprising the following steps:
cutting a metal wire to be repaired in the submarine cable protective layer to reserve a repairing space;
connecting the connecting pieces with the metal wires to be repaired in a one-to-one corresponding manner;
the connecting piece is partially overlapped with the metal wire, and the connecting piece is connected with the metal wire in a bolt connection mode; or the end part of the connecting piece is opposite to the end part of the metal wire, the connecting piece is connected with the metal wire in a cold pressure welding mode, and the compression joint direction is the axial direction of the connecting piece.
2. The underwater submarine cable restoration method according to claim 1, wherein the step of connecting the connector to the wire by means of a bolt connection comprises:
the two ends of the metal wire at the fracture are provided with first holes, the two ends of the connecting piece are provided with second holes corresponding to the first holes, and the first holes and the second holes are coaxially arranged;
a bolt assembly extends through the first and second holes and locks the overlapping portions of the connector and the wire.
3. An underwater submarine cable restoration method according to claim 2, wherein the bolt assembly comprises a bolt body and a fastener, the bolt body extends through the first and second holes, the fastener is disposed at an end of the bolt body and abuts against a surface of the connector, and the bolt body is subjected to a pre-load force during installation.
4. A method of underwater subsea cable repair according to claim 3, wherein said first holes have a diameter of 4-6mm, the distance between two adjacent first holes being at least 8mm, and the distance between said first holes and the end edge of said wire being at least 10 mm.
5. An underwater submarine cable restoration method according to claim 2, wherein the length of the region where one end of the connector overlaps the wire is 28mm or more in the direction in which the wire extends.
6. The submarine cable restoration method according to claim 1, wherein the pressure range of the cold-pressure welding is 500-1000 Mpa.
7. An underwater submarine cable restoration method according to claim 1, further comprising the steps of:
and winding a plurality of insulating ropes on the surface of the submarine cable, and coating the connecting piece and the metal wire to form an outer protective layer.
8. A submarine cable according to any one of claims 1 to 7, wherein the submarine cable comprises a core, an insulating sheath disposed on an outer surface of the core, a protective layer covering the insulating sheath, and an outer sheath, wherein the protective layer comprises a plurality of wires and a connector connected to the wires to be repaired.
9. The sea cable of claim 8 further comprising a bolt assembly, wherein said wire has a rectangular cross-sectional shape, said wire has a cross-sectional width of 6-8mm and a cross-sectional thickness of 2-3mm, said connector is disposed to partially overlap said wire, and said bolt assembly penetrates and locks the overlapping portion of said connector and said wire.
10. Submarine cable according to claim 8, wherein the cross-sectional shape of the wires is circular, the diameter of the wires is 3-6mm, the material and cross-sectional shape of the connector are the same as the wires, the wires and the connector are connected by means of cold-pressure welding at a pressure in the range 500-1000 Mpa.
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