Subsea cable repair method

Abstract

The application provides a submarine cable repairing method. The repairing structure submarine cable is repaired by the submarine cable repairing method, and the repairing structure submarine cable comprises a submarine cable internal structure, a submarine cable repairing structure and a submarine cable external structure. The submarine cable repairing structure is arranged on the outer surface of the submarine cable internal structure. The submarine cable external structure is arranged on the outer side of the submarine cable repairing structure. The submarine cable repairing structure comprises a movable bearing and a circular metal clasp. The movable bearing is arranged on the outer surface of the submarine cable internal structure. The circular metal clasp is arranged on the outer side of the movable bearing. The circular metal clasp is rotatably connected with the submarine cable internal structure through the movable bearing. A metal clamping groove is formed on the side of the circular metal clasp, away from the submarine cable internal structure. The metal wire of the repairing structure submarine cable is arranged in the metal clamping groove. The submarine cable external structure is arranged on the side of the circular metal clasp, away from the submarine cable internal structure, and covers the metal wire.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of new energy, in particular to a submarine cable repairing method. BACKGROUND

[0002] China is rich in marine resources, and the prospect of offshore wind power is broad. The development of offshore wind power cannot be separated from submarine cables. As an intermediate link, submarine cables can transport clean energy from the sea to the onshore power grid. Due to the particularity of the laying environment of submarine cables with long length, the marine environment is complex and changeable, and submarine cables will be subjected to different degrees of mechanical external force during production and laying. The armored metal wire assembly in the submarine cable is the main component that bears external mechanical pressure. The armored metal wire assembly will inevitably have a bulging phenomenon, and severe ones will have a phenomenon of armored metal wire assembly explosion, which will seriously affect the mechanical properties of the submarine cable product.

[0003] In the prior art, for the problem of arching and lantern-shaped explosion of the armored metal wire assembly in the submarine cable product, a method of winding one or more round steel wires at the problem point to fix is mainly used to slow down the worsening of the arching phenomenon of the armored metal wire at the problem point. However, this method only controls the armored metal wire with external force not to continue to spread and become larger, but the stress of the armored metal wire assembly at the problem point is not removed, so the abnormal phenomenon of the armored steel wire at the problem point is not eliminated, and the armored steel wire cannot be tightly and neatly arranged on the surface of the submarine cable, which greatly reduces the mechanical protection effect of the armored metal wire, such as compression resistance and tensile resistance, and causes irreversible impact on the quality of the submarine cable product.

[0004] How to solve the above problems is a problem that needs to be considered by those skilled in the art. SUMMARY

[0005] The present application provides a submarine cable repairing method that can effectively repair the bulging of the metal armored layer.

[0006] The embodiment of the present application provides a repairing structure submarine cable, which comprises a submarine cable internal structure, a submarine cable repairing structure and a submarine cable external structure. The submarine cable repairing structure is arranged around the outer surface of the submarine cable internal structure. The submarine cable external structure is arranged outside the submarine cable repairing structure. The submarine cable repairing structure comprises a movable bearing and a circular metal snap ring. The movable bearing is arranged on the outer surface of the submarine cable internal structure. The circular metal snap ring is arranged outside the movable bearing. The circular metal snap ring is rotatably connected with the submarine cable internal structure through the movable bearing. A metal snap groove is formed on the side of the circular metal snap ring away from the submarine cable internal structure. The metal wire of the repairing structure submarine cable is arranged in the metal snap groove. The submarine cable external structure is arranged on the side of the circular metal snap ring away from the submarine cable internal structure and covers the metal wire.

[0007] In a possible implementation, the outer structure of the submarine cable comprises, in sequence from outside, a zinc plating layer, an asphalt layer, an outer sheath layer and a second composite high-strength tape protection layer, and the innermost layer of the inner structure of the submarine cable is a first composite high-strength tape protection layer.

[0008] The application further provides a submarine cable repairing method for repairing a submarine cable to obtain a repaired structure submarine cable as described in the foregoing embodiments, and the submarine cable repairing method comprises the following steps:

[0009] Step S1: confirming a problem point of the submarine cable;

[0010] Step S2: fixing the submarine cable;

[0011] Step S3: opening an outer sheath layer and a metal armor layer of the submarine cable;

[0012] Step S4: winding a first composite high-strength tape protection layer outside an inner pad layer exposed after the metal armor layer is opened to protect the inner structure of the submarine cable, and installing a circular movable bearing outside the first composite high-strength tape protection layer;

[0013] Step S5: providing a circular metal snap ring outside the movable bearing, the circular metal snap ring can rotate around the circumference of the submarine cable through the movable bearing, and a plurality of spaced metal snap grooves are formed on a side of the circular metal snap ring away from the movable bearing;

[0014] Step S6: processing metal wires of the metal armor layer;

[0015] Step S7: welding and fixing the processed metal wires in the metal snap grooves;

[0016] Step S8: coating the circular metal snap ring and the metal wires arranged in the metal snap grooves with an anti-corrosion metal solution and asphalt in sequence to perform anti-corrosion protection;

[0017] Step S9: fixing and winding the outer sheath layer opened in Step S3 outside the circular metal snap ring using asphalt;

[0018] Step S10: providing a second composite high-strength tape protection layer outside the outer sheath layer.

[0019] In a possible implementation, in step S1, a position where the metal armor layer of the submarine cable cannot be fitted is confirmed as the problem point, 2-3 turns of adhesive tape are wound at 0.5 m before and after the problem point as a marker, and the part of the submarine cable with the marker is moved to a prefabricated support frame for fixation; in step S2, 4-6 turns of steel wire with a diameter greater than or equal to 4.0 mm are wound at the marker to fix the submarine cable; in step S3, the outer sheath at the problem point is cut, the polypropylene rope of the outer sheath is arranged and placed separately, the metal armor layer of the submarine cable is exposed, the metal wires in the metal armor layer are disconnected, the disconnected metal wires are grouped into 3-4 wires, the metal wires are bent to 90-120°, and the metal wires are fixed in groups.

[0020] In a possible implementation, in step S4, a composite high-strength tape is wound outside the inner cushion layer exposed after the metal armor layer is opened to form a first composite high-strength tape protection layer, which protects the internal structure of the submarine cable; then, a Haver-type movable bearing is buckled outside the first composite high-strength tape protection layer at the disconnection point of the metal wire, the predicted size of the movable bearing satisfies the equation W=F+U, where W is the inner diameter of the circular movable bearing, F is the diameter of the part measured from the metal armor layer inward in the submarine cable, and U is a first margin value, U is greater than or equal to 2 and less than or equal to 4, W, F, and U are in millimeters, and the movable bearing meeting the requirements is selected according to the predicted size of the movable bearing.

[0021] In a possible implementation, in step S5, the step of selecting the circular metal snap ring includes:

[0022] The predicted inner diameter of the circular metal snap ring satisfies the equation D=d+y, where D is the predicted inner diameter of the circular metal snap ring, d is the outer diameter of the movable bearing, and y is a second margin value, y is greater than or equal to 1 and less than or equal to 3, and D, d, and y are in millimeters;

[0023] The predicted thickness of the circular metal snap ring satisfies the equation K=T×2×R, where K is the predicted thickness of the circular metal snap ring, R is the radius of the metal wire of the metal armor layer, and T is a first coefficient, T is greater than or equal to 2 and less than or equal to 3, and K, T, and R are in millimeters;

[0024] The predicted width of the circular metal clasp satisfies the equation M=Q×2×R, wherein M is the predicted width of the circular metal clasp, R is the radius of the metal wire of the metal armor layer, Q is a second coefficient, the value of Q is greater than or equal to 5 and less than or equal to 8, and the units of M, Q and R are millimeters;

[0025] The predicted number of metal grooves of the circular metal clasp satisfies the equation n≤N, wherein n is the number of strands of the metal wire of the metal armor layer, and N is the number of metal grooves on the circular metal clasp.

[0026] The predicted metal groove depth of the circular metal clasp satisfies the equation h=2×R+P, wherein h is the predicted metal groove depth of the circular metal clasp, R is the radius of the metal wire of the metal armor layer, and P is a third coefficient, the value of P is greater than or equal to 3 and less than or equal to 5, and the units of h, P and R are millimeters.

[0027] The suitable circular metal clasp is selected according to the predicted values of the above equations, and the installation of the circular metal clasp is completed.

[0028] In a possible implementation, in step S6, the following steps are included:

[0029] The end of the metal wire of the cut metal armor layer is polished with a polisher, the part within a 10 cm length range of the polished end is cleaned with acetone, and the metal wire is cleaned root by root;

[0030] The zinc layer on the outer layer of the metal wire is dissolved and removed using a dissolving solution containing 20 parts of methenamine and 80 parts of hydrochloric acid, the metal wire is cleaned at least 3 times using the dissolving solution until there is no zinc layer reaction phenomenon on the surface of the metal wire, and the length of the dissolved part of the metal wire is at least half of the length of the metal clasp groove of the circular metal clasp;

[0031] The surface of the metal wire is washed with clean water for 2 to 3 times, and then the surface of the metal wire is wiped clean with a dust-free paper.

[0032] In a possible implementation, in step S7, the processed metal wire is placed in the metal clasp groove of the circular metal clasp, the metal wire in the same metal clasp groove is welded and fixed in the metal clasp groove in a welding manner, then the welding point is polished flat using a polisher, and the installation and fixation of all the metal wires are completed in the same way; in step S8, an anticorrosive metal solution is uniformly applied to the metal clasp groove of the circular metal clasp and the surface of the metal wire, the anticorrosive metal solution is solidified to complete the first anticorrosive protection, the surface is polished flat using sandpaper, and then molten asphalt is uniformly applied to the surface of the circular metal clasp to complete the second anticorrosive protection.

[0033] In a possible implementation, in step S9, a layer of pitch is coated on the surface of the metal wire, the polypropylene rope in the outer sheath layer opened in step S3 is then separated into strands and arranged and fixed along the surface of the armored metal layer, and the polypropylene rope is vertically wound along the vertical direction of the submarine cable by using a single or three polypropylene ropes simultaneously vertically wound, the winding of the first layer of polypropylene rope of the outer sheath layer is completed, and the second layer of polypropylene rope is wound outside the first layer of polypropylene rope in the same way; in step S10, 5 to 6 layers of composite high-strength tape are wound outside the outer sheath layer to obtain a second composite high-strength tape protection layer.

[0034] In a possible implementation, step S11 of marking the position of the circular metal snap ring on the outer surface of the second composite high-strength tape protection layer is further included.

[0035] Compared with the prior art, the submarine cable repair method provided by the embodiment of the application can release the stress accumulated in the armored metal layer at the problem point by cutting the metal wire at the problem point of the armored metal layer of the submarine cable. The cut armored metal wire is then welded on the circular metal ring with a metal slot and the rotatable movable bearing one by one to ensure the strength of the metal armored layer. After completion, the molten liquid zinc is coated on the welding point of the metal wire, and a layer of anticorrosive pitch is coated outside, and then the outer structure of the submarine cable is completed layer by layer to form the high-strength repaired structure submarine cable. By using the submarine cable repair method, the stress in the armored metal layer can be effectively eliminated, the fault point can be effectively eliminated, and the compression and tensile resistance of the steel wire can be further enhanced, the mechanical properties of the submarine cable are improved, and the high strength, reliability and stability of the product performance of the repaired structure submarine cable are effectively ensured. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 FIG. 1 is a structural schematic diagram of a repaired structure submarine cable according to an embodiment of the application.

[0037] Figure 2 FIG. 2 is a flowchart of a submarine cable repair method according to an embodiment of the application.

[0038] Main element symbol explanation: 1, repair structure submarine cable; 10, submarine cable internal structure; 101, water-blocking conductor; 102, conductor shielding layer; 103, cross-linked polyethylene insulation layer; 104, insulation shielding layer; 105, first layer water-blocking layer; 106, metal sheath; 107, second layer water-blocking layer; 108, foaming layer; 109, plastic sheath; 110, filling layer; 111, optical unit; 112, filling strip; 120, inner pad layer; 130, first composite type high-strength tape wrapping protective layer; 140, metal armor layer; 150, metal wire; 20, submarine cable repair structure; 201, movable bearing; 202, round metal snap ring; 203, metal clamping groove; 30, submarine cable external structure; 301, galvanized coating; 302, asphalt layer; 303, outer sheath; 304, second composite type high-strength tape wrapping protective layer.

[0039] The following detailed description will further describe the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0040] The following description will refer to the accompanying drawings to more fully describe the present application. The drawings show exemplary embodiments of the present application. However, the present application can be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided so that this application will be thorough and complete, and will fully convey the scope of the application to those skilled in the art. Like reference numerals refer to like components throughout the specification.

[0041] The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, to the extent that the terms "including", "includes", "having", "has", "a", "an", "one" or "said one" are used in this specification and / or claims, they are intended to be inclusive (meaning therein including one or more entities) and not exclusive (meaning therein without including any other entities).

[0042] Unless defined otherwise, all terms (including 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. Also, unless otherwise defined, terms such as those defined in a generally used dictionary are to be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and are not to be interpreted in an idealized or overly formal sense.

[0043] The specific embodiments of the present application will be further described below with reference to the accompanying drawings.

[0044] As Figure 1As shown, the embodiment of the present application provides a repairing structure submarine cable 1. The repairing structure submarine cable 1 comprises a submarine cable internal structure 10, a submarine cable repairing structure 20 and a submarine cable external structure 30. The submarine cable repairing structure 20 is arranged around the outer surface of the submarine cable internal structure 10. The submarine cable external structure 30 is arranged outside the submarine cable repairing structure 20. The submarine cable repairing structure 20 comprises a movable bearing 201 and a circular metal snap ring 202. The movable bearing 201 is arranged on the outer surface of the submarine cable internal structure 10. The circular metal snap ring 202 is arranged outside the movable bearing 201. The circular metal snap ring 202 is rotatably connected with the submarine cable internal structure 10 through the movable bearing 201. The circular metal snap ring 202 is provided with a metal snap groove 203 on the side away from the submarine cable internal structure 10. The metal wire 150 of the repairing structure submarine cable 1 is arranged in the metal snap groove 203. The submarine cable external structure 30 is arranged on the side of the circular metal snap ring 202 away from the submarine cable internal structure 10 and covers the metal wire 150.

[0045] In the embodiment, the submarine cable internal structure 10 comprises a water-blocking conductor 101, a conductor shielding layer 102, a cross-linked polyethylene insulation layer 103, an insulation shielding layer 104, a first layer of water-blocking layer 105, a metal sheath 106, a second layer of water-blocking layer 107, a foaming layer 108, a plastic sheath 109, a filling layer 110, an inner cushion layer 120 and a first composite high-strength tape protection layer 130 arranged in sequence from inside to outside.

[0046] Further, the water-blocking conductor 101 adopts a layered longitudinal wrapping water-blocking tape and a winding water-blocking yarn, or a longitudinal wrapping water-blocking tape. The water-blocking tape overlap rate can be 20% to 30%, so that the water-blocking conductor 101 has excellent water-blocking performance. The conductor shielding layer 102 can be composed of an extrusion-coated single-sided semi-conductive water-blocking tape and an extrusion-coated semi-conductive material. The cross-linked polyethylene insulation layer 103 can be uniformly extrusion-coated on the outer side of the conductor shielding layer 102. The insulation shielding layer 104 can be formed by directly extrusion-coating a smooth semi-conductive shielding material on the outer side of the cross-linked polyethylene insulation layer 103. The first layer of water-blocking layer 105 can be formed by winding a semi-conductive water-blocking tape on the outer side of the insulation shielding layer 104. The metal sheath layer 106 can be formed by wrapping a copper tape on the outer side of the first layer of water-blocking layer 105 after longitudinal wrapping and welding, and the metal sheath layer 106 can serve as a radial waterproof layer. The second layer of water-blocking layer 107 can be formed by winding a semi-conductive water-blocking tape on the outer side of the metal sheath layer 106. The foaming layer 108 can adopt an extrusion-coated foaming structure, and a high-performance foaming polyethylene plastic is directly extrusion-coated on the outer side of the second layer of water-blocking layer 107 to form the foaming layer 108. The plastic sheath layer 109 is directly extrusion-coated on the outer side of the foaming layer 108 using a non-hydrophilic polyethylene material; wherein the foaming layer 108 and the plastic sheath layer 109 can be simultaneously extruded. The filling layer 110 is composed of spaced apart light units 111 and filling strips 112, which serve as the first layer of armor structure, and the filling layer 110 is a mixed structure of the light units 111 and the filling strips 112; wherein the filling strips 112 can be replaced by metal wires, and the light units 111 are composed of optical fibers, stainless steel tubes, and polyethylene sheaths. The inner pad layer 120 is directly wrapped on the outer side of the filling layer 110 using a polypropylene high-strength polypropylene rope. The first composite high-strength tape protection layer 130 is mainly composed of fiber filaments, polyethylene, and glue, and specifically, the mass fraction of polyethylene plastic is 20%, the mass fraction of glue is 15%, and the mass fraction of fiber filaments is 65%; wherein the unit area coverage rate of the fiber filaments is greater than 80%, and the fiber filaments are directly wound on the inner pad layer 120 to tighten and fix, and the viscosity of the glue can be determined and selected according to actual needs.

[0047] Further, the metal armor layer 140 is arranged on the outer side of the first composite high-strength tape protection layer 130, and the metal armor layer 140 is formed by a plurality of metal wires 150. The metal armor layer 140 is cut off at the corresponding problem points and leaks out a plurality of disconnected metal wires 150. The metal armor layer 140 can be composed of steel wires, copper wires, or a mixture of steel wires and copper wires.

[0048] In the embodiment, the movable bearing 201 is a transmission device, which can be a Haversine shape. The movable bearing 201 is arranged on the outer side of the first composite high-strength tape protection layer 130, and is used to enable the circular metal snap ring 202 to have the ability of free movement compared to the internal structure 10 of the submarine cable, which can be rotation, so that each metal snap groove 203 of the circular metal snap ring 202 is in a suitable position.

[0049] In the embodiment, the circular metal clasp 202 can be a hollow concentric circular ring, and the circular metal clasp 202 is sleeved outside the movable bearing 201. A plurality of metal clamping grooves 203 are formed on the circular metal clasp 202, and the opening side of the metal clamping groove 203 faces away from the internal structure 10 of the submarine cable, so that the metal wire 150 can be placed therein. The plurality of metal clamping grooves 203 can be uniformly arranged, or can be arranged in a non-uniform manner according to the needs. Further, the material of the circular metal clasp 202 is 304 stainless steel, the circular metal clasp 202 is a half structure, and the connection of the circular metal clasp 202 adopts a reverse hooking manner, so that the circular metal clasp 202 can form a closed loop.

[0050] In an embodiment, the external structure 30 of the submarine cable includes a galvanized coating 301, an asphalt layer 302, an outer sheath 303 and a second composite high-strength tape protection layer 304 arranged outside the metal wire 150 in sequence, and the outermost layer of the internal structure 10 of the submarine cable is a first composite high-strength tape protection layer 130.

[0051] In the embodiment, the galvanized coating 301 mainly includes zinc (for example, the mass fraction of zinc is about 98%, and the mass fraction of other materials is about 2%), and the galvanized coating 301 is uniformly arranged in the metal clamping groove 203 of the circular metal clasp 202 and on the surface of the metal armor layer 140 after being melted.

[0052] In the embodiment, the asphalt layer 302 is directly coated on the circular metal clasp 202, and the asphalt layer 302 and the galvanized coating 301 jointly constitute the corrosion protection in the external structure 30 of the submarine cable.

[0053] It can be understood that, Figure 1 The galvanized coating 301 and the asphalt layer 302 are arranged outside the circular metal clasp 202, and in the actual process, the galvanized coating 301 and the asphalt layer 302 can be immersed in the metal clamping groove 203 to cover the metal wire 150, so as to realize the corrosion protection of the metal armor layer 140.

[0054] In the embodiment, the outer sheath 303 mainly includes a polypropylene rope, and the outer sheath 303 is directly wound outside the metal armor layer 140 and the circular metal clasp 202.

[0055] In the embodiment, the second composite high-strength tape protection layer 304 is mainly composed of fiber filaments, polyethylene and glue, and specifically, the mass fraction of polyethylene plastic is 20%, the mass fraction of glue is 15%, and the mass fraction of fiber filaments is 65%; wherein, the unit area coverage rate of the fiber filaments is greater than 80%, and the fiber filaments are directly wound on the outer sheath 303 to be tightened and fixed, and the viscosity of the glue can be determined and selected according to actual needs.

[0056] As Figure 2As shown, the embodiments of the present application also provide a submarine cable repairing method for repairing a submarine cable to obtain a repaired structure submarine cable as described in the foregoing embodiments, comprising the following steps:

[0057] Step S1: confirming a problem point of the submarine cable.

[0058] In an embodiment, the position where the metal armor layer of the submarine cable cannot be fitted is confirmed as the problem point. 2-3 turns of adhesive tape are wound around 0.5 meters before and after the problem point as a marker, and the part of the submarine cable with the marker is moved to the pre-prepared support frame for fixation.

[0059] Step S2: fixing the submarine cable.

[0060] In an embodiment, 4-6 turns of steel wire with a diameter greater than or equal to 4.0 mm are wound around the marker to fix the submarine cable.

[0061] Step S3: opening the outer sheath and metal armor layer of the submarine cable.

[0062] In an embodiment, an art knife or other suitable knife is used to cut the outer sheath near the problem point, and the polypropylene rope of the outer sheath is sorted and placed separately to expose the metal armor layer of the submarine cable. The metal wires in the metal armor layer are cut one by one using a wire cutter, and the cut metal wires are sorted in groups of 3-4, bent to 90-120°, and fixed in groups.

[0063] Step S4: wrapping a first composite high-strength wrapping protective layer outside the inner pad layer exposed after the opening of the metal armor layer to protect the internal structure of the submarine cable, and installing a circular movable bearing outside the first composite high-strength wrapping protective layer.

[0064] In an embodiment, a composite high-strength wrapping tape is wrapped outside the inner pad layer exposed after the opening of the metal armor layer at a lap rate of 50-60% to form a first composite high-strength wrapping protective layer to protect the internal structure of the submarine cable. Then, a knuckle joint type movable bearing is buckled outside the first composite high-strength wrapping protective layer at the cut point of the metal wire. The predicted size of the movable bearing satisfies the equation W=F+U, where W is the inner diameter of the circular movable bearing, F is the measured diameter of the submarine cable inward from the metal armor layer, and U is a first margin value, U is greater than or equal to 2 and less than or equal to 4, W, F, and U are in millimeters, and the movable bearing that meets the requirements is selected according to the predicted size of the movable bearing.

[0065] Step S5: A circular metal clasp is arranged outside the movable bearing, the circular metal clasp can rotate around the circumference of the submarine cable through the movable bearing, and a plurality of spaced metal clasp grooves are arranged on the side of the circular metal clasp away from the movable bearing.

[0066] In an embodiment, the step of determining the circular metal clasp comprises:

[0067] The predicted inner diameter of the circular metal clasp satisfies the equation D=d+y, wherein D is the predicted inner diameter of the circular metal clasp, d is the outer diameter of the movable bearing, and y is a second margin value, y is greater than or equal to 1 and less than or equal to 3, and the units of D, d, and y are millimeters;

[0068] The predicted thickness of the circular metal clasp satisfies the equation K=T×2×R, wherein K is the predicted thickness of the circular metal clasp, R is the radius of the metal wire of the metal armor layer, and T is a first coefficient, T is greater than or equal to 2 and less than or equal to 3, and the units of K, T, and R are millimeters;

[0069] The predicted width of the circular metal clasp satisfies the equation M=Q×2×R, wherein M is the predicted width of the circular metal clasp, R is the radius of the metal wire of the metal armor layer, and Q is a second coefficient, Q is greater than or equal to 5 and less than or equal to 8, and the units of M, Q, and R are millimeters;

[0070] The predicted number of metal grooves of the circular metal clasp satisfies the equation n≤N, wherein n is the number of strands of the metal wire of the metal armor layer, and N is the number of metal grooves on the circular metal clasp;

[0071] The predicted metal groove depth of the circular metal clasp satisfies the equation h=2×R+P, wherein h is the predicted metal groove depth of the circular metal clasp, R is the radius of the metal wire of the metal armor layer, and P is a third coefficient, P is greater than or equal to 3 and less than or equal to 5, and the units of h, P, and R are millimeters;

[0072] The circular metal clasp with appropriate dimensions is selected according to the predicted values of the above equations, and the installation of the circular metal clasp is completed.

[0073] Step S6: The metal wire of the metal armor layer is treated.

[0074] In an embodiment, the treatment of the metal wire comprises the following steps:

[0075] The cut end of the metal wire of the metal armor layer is polished flat with a sander, the 10 cm length range of the polished end is cleaned with acetone, and the metal wire is washed one by one.

[0076] The zinc layer of the outer layer of the metal wire is dissolved and removed using a dissolving solution containing 20 parts of methenamine and 80 parts of hydrochloric acid. The metal wire is cleaned with the dissolving solution for at least 3 times until there is no zinc layer reaction on the surface of the metal wire. The length of the dissolved part of the metal wire is at least half of the length of the metal card groove of the circular metal card ring.

[0077] The surface of the metal wire is washed with clean water for 2 to 3 times, and then the surface of the metal wire is wiped clean with a dust-free paper.

[0078] Step S7: The processed metal wire is welded and fixed in the metal card groove.

[0079] In an embodiment, the processed metal wire is placed in the metal card groove of the circular metal card ring, and the metal wire in the same metal card groove is welded and fixed in the metal card groove by welding. Then, the polishing machine is used to polish the welding point flat, and the same method is used to complete the installation and fixation of all the metal wires.

[0080] Step S8: The circular metal card ring and the metal wire arranged in the metal card groove are coated with an anti-corrosion metal solution and asphalt in sequence for corrosion protection.

[0081] In an embodiment, the anti-corrosion metal solution (such as molten zinc liquid) is uniformly coated on the surface of the metal wire and in the metal card groove of the circular metal card ring. After the anti-corrosion metal solution solidifies and completes the first corrosion protection, the sandpaper (such as 1000 grit sandpaper) is used to polish flat, and then the molten asphalt is uniformly coated on the surface of the circular metal card ring to complete the second corrosion protection.

[0082] Step S9: The outer coating layer opened in step S3 is fixed and wound on the outside of the circular metal card ring using asphalt.

[0083] In an embodiment, a layer of asphalt is lightly brushed on the surface of the steel wire with a brush, the polypropylene ropes in the outer coating layer opened in step S3 are divided into strands and arranged along the surface of the armored metal layer in a snug manner and fixed, and then a single or three polypropylene ropes are vertically wound along the vertical direction of the submarine cable by vertically winding the polypropylene ropes in a close arrangement and tightly tightening manner to complete the winding of the first layer of polypropylene ropes of the outer coating layer. Then, the second layer of polypropylene ropes is wound outside the first layer of polypropylene ropes in the same manner, and after the vertical winding of the second layer of polypropylene ropes is completed, the tail end is fixed and knotted. The surface of the polypropylene ropes is coated with asphalt using a brush, and the asphalt coating should be comprehensive and cannot be missed.

[0084] Step S10: A second composite high-strength tape protection layer is arranged outside the outer coating layer.

[0085] In an embodiment, 5-6 layers of composite high-strength wrapping tape are wound outside the outer coating layer after the recovery is completed to obtain a second composite high-strength wrapping tape protective layer (the winding should cover the entire outer coating layer winding working surface to achieve protection of the outermost layer of the product).

[0086] Step S11: Mark the position of the circular metal snap ring on the outer surface of the second composite high-strength wrapping tape protective layer.

[0087] Compared with the prior art, the submarine cable repair method provided by the embodiment of the application can release the stress accumulated in the problem point of the armored metal layer of the submarine cable by cutting the metal wires of the problem point of the armored metal layer. Then, the cut armored metal wires are welded on the circular metal ring one by one by setting the circular metal ring with a metal clamping groove and the rotatable movable bearing, so as to ensure the strength of the metal armored layer. After completion, the welded points of the metal wires are coated with molten liquid zinc, and then an outer layer of anti-corrosion asphalt is coated, and then the outer structure of the submarine cable is completed layer by layer to form a high-strength repaired structure submarine cable. Through the submarine cable repair method of the application, the stress in the armored metal layer can be effectively eliminated, the fault point can be effectively eliminated, and the compression and tensile resistance of the steel wires can be further enhanced, so as to improve the mechanical properties of the submarine cable and effectively ensure the high strength, reliability and stability of the product performance of the repaired structure submarine cable.

[0088] Further, the submarine cable repair method provided by the embodiment of the application can effectively eliminate the stress of the metal wires generated in the production and circulation process of the submarine cable, can improve the mechanical ability of the armored metal wires, and can further meet the requirements of the metal armored layer and the circulation performance of the submarine cable with large length, large cross section and ultra-high pressure.

[0089] Further, the submarine cable repair method provided by the embodiment of the application uniformly fixes the armored metal layer on the circular metal ring by cutting and welding, increases the actual connection area of the metal wires, can effectively ensure the electrical connection of the metal structure, can solidify the armored metal layer, can effectively reduce the overall loss of the submarine cable, can reduce the risk of short circuit failure of the submarine cable, and can improve the safety and operation reliability of the submarine cable.

[0090] Further, the submarine cable repair method provided by the embodiment of the application adopts the measures of multi-point uniform contact and multi-layer protection of different materials, which can more effectively guarantee the use quality and service life of the submarine cable product, improve the power transmission performance of the submarine cable, and guarantee the safety of power use.

[0091] In the foregoing, the specific embodiments of the application are described with reference to the accompanying drawings. However, those skilled in the art can understand that various changes and replacements can be made to the specific embodiments of the application without departing from the scope of the application. These changes and replacements are within the scope defined by the application.

Claims

1. A method for repairing submarine cables, characterized in that, The aforementioned submarine cable repair method is used to repair submarine cables to obtain repairable submarine cables. The repairable submarine cable includes an internal submarine cable structure, a repairable submarine cable structure, and an external submarine cable structure. The repairable submarine cable structure is disposed around the outer surface of the internal submarine cable structure, and the external submarine cable structure is disposed outside the repairable submarine cable structure. The repairable submarine cable structure includes a movable bearing and a circular metal retainer. The movable bearing is disposed on the outer surface of the internal submarine cable structure, and the circular metal retainer is disposed outside the movable bearing. The circular metal retainer is rotatably connected to the internal submarine cable structure through the movable bearing. A metal slot is formed on the side of the circular metal retainer away from the internal submarine cable structure, and the metal wires of the repairable submarine cable are disposed in the metal slot. The external submarine cable structure is disposed on the side of the circular metal retainer away from the internal submarine cable structure and covers the metal wires. The submarine cable repair method includes the following steps: Step S1: Identify the problem point of the submarine cable. Identify the location in the metal armor layer of the submarine cable that cannot be properly attached. This location is the problem point. Use tape to wrap around the problem point 2 to 3 times 0.5 meters before and after it as a marker point. Move the part of the submarine cable with the marker point to the prefabricated support frame for fixation. Step S2: Secure the submarine cable by wrapping it 4 to 6 times with a steel wire of diameter greater than or equal to 4.0 mm around the marked point. Step S3: Open the outer sheath and metal armor layer of the submarine cable, cut the outer sheath at the problem point, and separate and arrange the polypropylene rope of the outer sheath into strands to expose the metal armor layer of the submarine cable. Break the metal wires in the metal armor layer, and divide the broken metal wires into strands of 3 to 4 strands each. Bend the metal wires to 90° to 120° and fix the strands. Step S4: Wrap a first composite high-strength wrapping tape protective layer around the outer side of the inner padding layer exposed after the metal armor layer is opened to protect the internal structure of the submarine cable. Install a circular movable bearing on the outer side of the first composite high-strength wrapping tape protective layer. Step S5: A circular metal retaining ring is provided on the outside of the movable bearing. The circular metal retaining ring rotates around the circumference of the submarine cable through the movable bearing. The circular metal retaining ring has multiple spaced metal slots on the side away from the movable bearing. Step S6: Process the metal wires of the metal armor layer; Step S7: Weld the processed metal wire into the metal slot. Place the processed metal wire into the metal slot of the circular metal ring. Weld the metal wires in the same metal slot into the metal slot. Then grind the welding points smooth with a grinder. Complete the installation and fixation of all the metal wires in the same way. Step S8: Apply anti-corrosion metal solution and asphalt sequentially to the circular metal retaining ring and the metal wire in the metal slot for corrosion protection. Apply the anti-corrosion metal solution evenly to the metal slot of the circular metal retaining ring and the surface of the metal wire. After the anti-corrosion metal solution has cured and the first corrosion protection is completed, use sandpaper to smooth it. Then apply molten asphalt evenly to the surface of the circular metal retaining ring to complete the second corrosion protection. Step S9: Use asphalt to fix and wrap the outer sheath layer opened in step S3 around the outside of the circular metal clasp. Coat the surface of the metal wire with a layer of asphalt. Then, strand the polypropylene rope in the outer sheath layer opened in step S3 and fix it along the surface of the metal armor layer. Then, use one or three polypropylene ropes to wrap the polypropylene rope vertically in the direction of the coastal cable to complete the first layer of polypropylene rope wrapping of the outer sheath layer. Wrap the second layer of polypropylene rope around the outside of the first layer of polypropylene rope in the same way. Step S10: A second composite high-strength wrapping tape protective layer is provided on the outside of the outer sheath layer. Five to six layers of composite high-strength wrapping tape are wrapped around the outside of the outer sheath layer to obtain the second composite high-strength wrapping tape protective layer.

2. The submarine cable repair method as described in claim 1, characterized in that: In step S4, a composite high-strength wrapping tape is wrapped around the outer side of the exposed inner padding layer after the metal armor layer is opened, with an overlap rate of 50% to 60%, to form a first composite high-strength wrapping tape protective layer, which protects the internal structure of the submarine cable. Subsequently, the Haver-type movable bearing is snapped onto the outer side of the first composite high-strength wrapping tape protective layer at the break point of the metal wire. The predicted size of the movable bearing satisfies the equation W=F+U, where W is the inner diameter of the circular movable bearing, F is the measured diameter of the portion of the submarine cable from the metal armor layer inward, and U is the first redundancy value, which is greater than or equal to 2 and less than or equal to 4. The units of W, F, and U are millimeters. The movable bearing that meets the requirements is selected according to the predicted size of the movable bearing.

3. The submarine cable repair method as described in claim 1, characterized in that, Step S6 includes: The ends of the cut metal wires of the metal armor layer are ground flat with a grinder. The portion of the ground ends within a 10-centimeter length is cleaned with acetone, and each metal wire is cleaned individually. The zinc layer on the outer layer of the metal wire is dissolved and removed using a solution containing 20 parts hexamethylenetetramine and 80 parts hydrochloric acid. The metal wire is then washed with the solution at least three times until there is no zinc layer reaction on the surface of the metal wire. The length of the dissolved portion of the metal wire is at least half the length of the metal groove of the circular metal retainer. Rinse the surface of the metal wire with clean water 2 to 3 times to remove the solution, and then wipe the surface of the metal wire clean with lint-free paper.

4. The submarine cable repair method as described in claim 1, characterized in that, It also includes step S11: marking the location of the circular metal clasp on the outer surface of the second composite high-strength wrapping protective layer.

5. The submarine cable repair method as described in claim 1, characterized in that, The external structure of the submarine cable includes a galvanized coating, an asphalt layer, an outer sheath, and a second composite high-strength wrapping protective layer sequentially disposed on the outside of the metal wire, and the outermost layer of the internal structure of the submarine cable is a first composite high-strength wrapping protective layer.

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