Anti-corrosion maintenance method and anti-corrosion maintenance structure for cable sheath damage and cable high-strength steel wire

Abstract

The invention belongs to the field of bridge cable maintenance, and discloses an anti-corrosion maintenance method and an anti-corrosion maintenance structure for cable sheath damage and cable high-strength steel wires, which are used for solving the problems of complete sealing and corrosion prevention in the cable sheath repair process and the durability of the repaired cable. A damaged part of a cable sheath is firstly coated with a waterproof insulating coating material, then the damaged part of the sheath is filled with a solid electrolyte sealing material, and the measuring ends of an auxiliary anode and a reference electrode are arranged in the solid electrolyte sealing material; the auxiliary anode is connected with an electronic variable resistor, an automatic control rectifier or a constant potential rectifier, and a conductive loop is formed between the auxiliary anode and a cathode access point on a cable high-strength steel wire; and wrapping the damaged part of the cable by using a physical anti-corrosion layer to form a closed anti-corrosion system at the damaged part of the sheath. According to the corrosion-resistant maintenance method for cable sheath damage and cable high-strength steel wires, the local damage position of the sheath can be maintained, inhibition of corrosion of the cable steel wires at the damage position of the sheath is enhanced, the influence of electrochemical corrosion on the service life of the cable is relieved, and therefore the service life of the cable is greatly prolonged.

Description

Technical Field

[0001] The invention relates to the fields of bridge cable maintenance, cable steel wire anti-corrosion and impressed current cathode protection, and in particular to an anti-corrosion maintenance method and an anti-corrosion maintenance structure for cable sheath damage and cable high-strength steel wire. Background Art

[0002] In recent years, my country's cable-structured bridges, such as suspension bridges, cable-stayed bridges and tie-arch bridges, have developed rapidly. Among the top ten bridges of various types in the world, China accounts for half of them, making it the world's largest bridge country. As these large-span cable-structured bridges gradually enter the operation and maintenance period, my country's bridge development has transitioned from "reconstruction and light maintenance" to "construction and maintenance" and is accelerating the transition to "maintenance as the main focus". Large-span cable bridges are often traffic control projects that carry extremely important economic and social functions. The structural characteristics, stress characteristics and environment of large bridges are essentially different from those of conventional bridges. The maintenance scale is large, the cycle is long and the technical requirements are high. Therefore, conventional traditional maintenance concepts, thinking and methods can no longer meet the actual maintenance needs.

[0003] Cables are important load-bearing structures for long-span cable-stayed bridges, suspension bridges, and tied arch bridges. Cables and articulated slings use a HDPE-sheathed galvanized parallel steel wire system. The steel wires are 5 mm or 7 mm galvanized high-strength steel wires with a tensile strength of more than 1670 MPa. A protective belt is wrapped around the outside of the steel wire bundle. The inner layer of the sheath is black high-density polyethylene, and the outer layer is colored high-density polyethylene. The cable steel wire is subjected to high stress and fatigue loads in service. The traffic volume increases year by year, and the temperature rise, drastic changes, internal temperature differences, and solar radiation will accelerate the aging and damage of the cable sheath. From the perspective of practical use, during the complex construction process and operation period, under the influence of human factors, machinery and equipment, loads, accidents, and temperature, the cable will inevitably be damaged to varying degrees, resulting in local damage and cracks in the cable sheath. Since long-span cable bridges are often in service on large rivers and coastal areas, the sheath loses its protective effect on the internal high-strength steel wire after being damaged, and the cable steel wire is directly exposed to the harsh atmospheric environment. Corrosive ions are deposited on the surface of the steel wire. The humid atmosphere under the temperature difference between day and night forms dew on the surface of the steel wire, especially when it rains, which dissolves in rainwater and enters the interior of the cable. This leads to severe local electrochemical corrosion of the cable steel wire. Under the coupling effect of stress corrosion and corrosion fatigue, the corrosion mechanism of the cable steel wire is more complicated, causing serious safety and durability problems.

[0004] In order to ensure the normal use of the bridge and eliminate potential safety hazards, it is necessary to repair the cracked and damaged parts of the cable sheath. Patent CN111172896A discloses a cable repair method, which also adopts a commonly used repair method. It uses materials such as high-density polyethylene or polyvinyl chloride wrapping tape, and uses angle grinders, hot air plastic welding guns and other machines to cut, trim and clean the local damaged parts, and then paint or wrap a layer of anti-corrosion layer on the outside of the cable or repair it by hot melting. It mainly uses the means of isolating the external corrosive environment, which has achieved certain results in extending the life of the cable. However, in actual engineering, the existence of blind spots in protection, difficulty in complete sealing, and easy cracking and damage of the sheath and coating often occur. Up to now, the complete sealing and corrosion protection of bridge cables is still a difficult problem in actual engineering, and it is difficult to avoid air, corrosive pollutants and rainwater from entering the cable body. Summary of the invention

[0005] In order to solve the above technical problems, the present invention proposes a method and structure for anti-corrosion repair of cable sheath damage and cable high-strength steel wire. Based on the original cable steel wire anti-corrosion structure, it is optimized and improved to achieve repair of cable sheath cracks and damages and electrochemical anti-corrosion of cable high-strength steel wire, thereby further achieving efficient and long-lasting protection of high-strength steel wire.

[0006] To achieve the above object, the technical solution of the present invention is implemented as follows: A method for anti-corrosion maintenance of cable sheath damage and cable high-strength steel wire, the steps are as follows: (1) Apply the waterproof insulating coating material to the gaps around the damaged part of the cable sheath and the high-strength steel wire, and leave the high-strength steel wire exposed; (2) After the waterproof insulation coating material solidifies, fill the solid electrolyte sealing material into the damaged part of the sheath; (3) The measuring ends of the auxiliary anode and the reference electrode are placed inside the solid electrolyte sealing material and insulated from the high-strength steel wire at the damaged part of the sheath inside the cable; (4) After the solid electrolyte sealing material solidifies, the damaged part of the cable is wrapped with a physical anti-corrosion layer to form a closed anti-corrosion system at the damaged part of the sheath; (5) The auxiliary anode is connected to the electronic variable resistor and the rectifier or the constant potential instrument in sequence; the other end of the reference electrode, the cathode access point on the high-strength steel wire of the cable is connected to the rectifier or the constant potential instrument, and the rectifier or the constant potential instrument is connected to the power supply, so as to form an electrochemical corrosion protection system for the high-strength steel wire of the cable at the damaged sheath. A conductive loop is formed between the solid electrolyte sealing material, the auxiliary anode located in the solid electrolyte sealing material, and the cathode access point set on the high-strength steel wire, so that the high-strength steel wire is cathodically polarized, thereby preventing further electrochemical corrosion of the cable.

[0007] Furthermore, a voltmeter is also connected to the high-strength steel wire.

[0008] Furthermore, the electrochemical corrosion protection system also includes an ammeter connected in series to the entire circuit. The voltmeter and the ammeter together constitute a potential and current measuring device.

[0009] Specifically, the potential data of the cable steel wire can be obtained in real time through the set reference electrodes and potential and current measuring devices to ensure that it is within the protected range; if the monitoring data deviates from the protected range due to deviations or changes in environmental factors, the output parameters of the rectifier or constant potentiostat and the resistance value of the electronic variable resistor are adjusted using an automatic control program to ensure that the actual potential value data of the high-strength steel wire of the cable is within the target potential value range.

[0010] Before applying the waterproof insulating coating material in the above step (1), it is also necessary to clean the surface stains and rust layer of the damaged part of the cable sheath.

[0011] In the above step (3), the auxiliary anode is any one or more combinations of carbon fiber cloth, lead-silver anode, platinum anode, mixed metal oxide anode, strip auxiliary anode and conductive coating anode material.

[0012] In the above step (3), the reference electrode is made of mercurous sulfate electrode or calomel electrode.

[0013] In the above step (4), the physical anti-corrosion layer includes a wrapping tape and a high-density polyethylene sheath.

[0014] In the above step (4), the wrapping tape is wrapped around the damaged part of the cable to form an airtight protection.

[0015] In the above step (4), the high-density polyethylene sheath is heat-melted and welded to the outer side of the wrapping tape along the longitudinal direction of the cable by a hot-melt welding gun.

[0016] An anti-corrosion maintenance structure prepared using the above-mentioned anti-corrosion maintenance method.

[0017] The above-mentioned anti-corrosion maintenance structure includes a waterproof insulating coating material layer at the gaps around the damaged part of the cable sheath and the high-strength steel wire, and a physical anti-corrosion layer sleeved on the outside of the cable sheath; there is a solid electrolyte sealing material between the waterproof insulating coating material layer and the physical anti-corrosion layer, and the solid electrolyte sealing material contains the measuring ends of the auxiliary anode and the reference electrode. The other ends of the auxiliary anode, the reference electrode and the cathode access point on the high-strength steel wire in the cable are all connected to the power supply through a rectifier or a constant potentiostat, the auxiliary anode is connected to the rectifier or the constant potentiostat through an electronic variable resistor, and a voltmeter is connected to the high-strength steel wire.

[0018] Furthermore, the above-mentioned physical anti-corrosion layer includes a wrapping tape and a high-density polyethylene sheath from inside to outside.

[0019] The beneficial effects produced by the present invention are: (1) The present invention proposes a method for anti-corrosion maintenance of cable sheath damage and cable high-strength steel wire. The method comprises applying a waterproof insulating coating material to the damaged position of the cable sheath and leaving the high-strength steel wire in a bare state; after the waterproof insulating coating material solidifies, filling the damaged position of the sheath with a solid electrolyte sealing material; placing the measuring ends of the auxiliary anode and the reference electrode inside the solid electrolyte sealing material and insulating the high-strength steel wire at the damaged position of the sheath in the cable; after the solid electrolyte sealing material solidifies, wrapping the damaged position of the cable with a physical anti-corrosion layer to form a closed anti-corrosion system at the damaged position of the sheath; the auxiliary anode is sequentially connected to an electronic variable resistor, a rectifier or a constant potentiostat through an insulated shielded wire, and the other end of the reference electrode and the cathode access point on the high-strength steel wire of the cable are respectively connected to the rectifier or the constant potentiostat through an insulated shielded wire, and the rectifier or the constant potentiostat is connected to a power supply. The present invention provides an innovative and simple anti-corrosion maintenance method, which overcomes the technical problems in the prior art of short service life of high-strength steel wire of cables due to the existence of protection blind spots, difficulty in complete sealing, and easy cracking and damage of sheaths and coatings.

[0020] (2) The present invention proposes a new type of anti-corrosion maintenance structure that can be used for the maintenance and anti-corrosion of in-service bridge cables. By providing a waterproof insulating coating material layer at the damaged part of the cable sheath, a high-strength steel wire electrochemical anti-corrosion system filled with solid electrolyte sealing material and a physical anti-corrosion layer (wrapping tape and thermoplastic high-density polyethylene sheath), a closed anti-corrosion system is formed at the damaged part of the cable sheath, providing multiple protections for the high-strength steel wire of the cable at the damaged part of the sheath, thereby achieving efficient and long-lasting protection for the high-strength steel wire. First, the waterproof insulating coating material layer can prevent rainwater from entering the cable after the physical anti-corrosion layer is damaged, and corroding the cable steel wires in other parts. Secondly, the solid electrolyte sealing material conductive cable wire electrochemical anti-corrosion system provides more stable cathodic protection for high-strength steel wire, which can not only prevent the accumulated humid air and corrosive ions from continuing to corrode the cable high-strength steel wire, but also when the closed anti-corrosion layer of the bridge cable is damaged and rainwater invades the cable, the output parameters of the constant potential instrument or rectifier can be adjusted in time according to the reference electrode and potential monitoring data to complete the electrochemical anti-corrosion of the cable wire in a humid electrolyte environment, providing multiple protections for the cable high-strength steel wire. Finally, the physical anti-corrosion layer can achieve further sealing and anti-corrosion of the bridge cable, thereby further extending the durability of the cable structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is an overall schematic diagram of the anti-corrosion maintenance structure of the cable steel wire of the present invention and a schematic diagram of the cross-section of the cable structure after maintenance.

[0023] Figure 2 2 is a schematic diagram of the structure of the cable structure after maintenance according to an embodiment of the present invention.

[0024] Figure 3 It is a schematic plan view of the cable structure after maintenance according to an embodiment of the present invention.

[0025] Figure 4 It is a flow chart of the electrochemical anti-corrosion method in the cable structure of the present invention.

[0026] In the figure: 1. high-strength steel wire, 2. damaged part of the sheath, 3. waterproof insulating coating material layer, 4. solid electrolyte sealing material, 5. auxiliary anode, 6. reference electrode, 7. cathode access point, 8. physical anti-corrosion layer, 81. wrapping tape, 82. high-density polyethylene sheath, 9. rectifier or constant potentiostat, 10. electronic variable resistor, 11. power supply, 12. voltmeter, 13. ammeter. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Example 1 The cable sheath damage and the anti-corrosion repair method of the cable high-strength steel wire of this embodiment have the following steps: (1): After cleaning the surface stains and rust layer of the damaged part of the cable sheath, apply the liquid waterproof insulation coating material to the gap around the damaged part of the cable sheath and the high-strength steel wire, and leave the high-strength steel wire in a bare state; (2): After the waterproof insulation coating material solidifies, fill the solid electrolyte sealing material into the damaged part of the sheath; (3): According to the size and shape of the sheath damage, the position, shape and size of the auxiliary anode (carbon fiber cloth) and the type and position of the reference electrode are designed, and the measuring ends of the auxiliary anode and the reference electrode (mercurous sulfate electrode) set at the point are built inside the solid electrolyte sealing material and insulated from the high-strength steel wire at the sheath damage in the cable; (4): After the solid electrolyte sealing material solidifies, wrap the damaged part of the cable with a physical anti-corrosion layer (wrapping tape and heat-shrinkable high-density polyethylene sheath); wrap the damaged part of the cable with the wrapping tape to form an airtight protection; (5): Wrap a heat-shrinkable high-density polyethylene sheath on the outside of the wrapping tape, and use a hot-melt welding gun to hot-melt weld the heat-shrinkable high-density polyethylene sheath along the longitudinal direction of the cable to form a closed anti-corrosion system at the damaged part of the sheath; (6): The auxiliary anode is connected to the auxiliary electrode (positive electrode) of the electronic variable resistor, rectifier or constant potential instrument in sequence through an insulated shielded wire. The cathode access point on the high-strength steel wire in the cable is connected to the working electrode (negative electrode) of the rectifier or constant potential instrument through an insulated shielded wire. The other end of the reference electrode is connected to the reference electrode of the rectifier or constant potential instrument through an insulated shielded wire. The automatic control rectifier or constant potential instrument is connected to the power supply (battery), thereby forming an electrochemical corrosion protection system for the high-strength steel wire of the cable at the damaged sheath.

[0029] Example 2 The cable sheath damage and the anti-corrosion repair method of the cable high-strength steel wire of this embodiment have the following steps: (1): After cleaning the surface stains and rust layer of the damaged part of the cable sheath, apply the liquid waterproof insulation coating material to the gap around the damaged part of the cable sheath and the high-strength steel wire, and leave the high-strength steel wire in a bare state; (2): After the waterproof insulation coating material solidifies, fill the solid electrolyte sealing material into the damaged part of the sheath; (3): According to the size and shape of the sheath damage, the position, shape and size of the auxiliary anode (lead-silver anode) and the type and position of the reference electrode are designed, and the measuring end of the auxiliary anode and the reference electrode (calomel electrode) set at the point are built into the solid electrolyte sealing material and insulated from the high-strength steel wire at the sheath damage in the cable; (4): After the solid electrolyte sealing material solidifies, wrap the damaged part of the cable with a physical anti-corrosion layer (wrapping tape and heat-shrinkable high-density polyethylene sheath); wrap the damaged part of the cable with the wrapping tape to form an airtight protection; (5): Wrap a heat-shrinkable high-density polyethylene sheath on the outside of the wrapping tape, and use a hot-melt welding gun to hot-melt weld the heat-shrinkable high-density polyethylene sheath along the longitudinal direction of the cable to form a closed anti-corrosion system at the damaged part of the sheath; (6): The auxiliary anode is connected to the auxiliary electrode (positive electrode) of the electronic variable resistor, rectifier or constant potential instrument in sequence through an insulated shielded wire, the cathode access point on the high-strength steel wire in the cable is connected to the working electrode (negative electrode) of the rectifier or constant potential instrument through an insulated shielded wire, the other end of the reference electrode is connected to the reference electrode of the rectifier or constant potential instrument through an insulated shielded wire, and the rectifier or constant potential instrument is connected to the power supply (battery), thereby forming an electrochemical corrosion protection system for the high-strength steel wire of the cable at the damaged sheath. Among them, a voltmeter is also connected to the high-strength steel wire, and an ammeter is connected in series in the entire circuit.

[0030] Example 3 The present invention discloses an anti-corrosion maintenance structure. The overall schematic diagram of the anti-corrosion maintenance structure is as follows: Figure 1 As shown, it includes a waterproof insulating coating material layer 3 at the gap around the damaged part 2 of the cable sheath and the high-strength steel wire, and a physical anti-corrosion layer 8 sleeved on the outside of the cable sheath, wherein the waterproof insulating coating material layer 3 is to prevent rainwater from entering the cable after the physical anti-corrosion layer 8 is damaged and corroding the cable steel wires in other parts. The physical anti-corrosion layer 8 includes a wrapping tape 81 from the inside to the outside and a high-density polyethylene sheath 82, which is conducive to airtight protection and forming a closed anti-corrosion system at the damaged part of the sheath. There is a solid electrolyte sealing material 4 between the waterproof insulating coating material layer 3 and the physical anti-corrosion layer 8, and the solid electrolyte sealing material 4 contains the measuring end of the auxiliary anode 5 and the reference electrode 6. The other end of the auxiliary anode 5, the reference electrode 6 and the cathode access point 7 on the high-strength steel wire 1 in the cable are all connected to the power supply 11 through a rectifier or a constant potential instrument 9, and the auxiliary anode 5 and the rectifier or constant potential instrument 9 are connected through an electronic variable resistor 10.

[0031] Specifically, the cathode access point 7 is arranged on the high-strength steel wire 1 in the cable, and is connected to the working electrode (negative electrode) of the rectifier or the constant potential instrument 9, the auxiliary anode 5 is sequentially connected to the electronic variable resistor 10, the auxiliary electrode (positive electrode) of the rectifier or the constant potential instrument 9, and the other end of the reference electrode 6 is connected to the reference electrode of the rectifier or the constant potential instrument 9. A voltmeter 12 is also connected between the high-strength steel wires 1.

[0032] The power supply 11 provides electric energy to the rectifier or the constant potential instrument 9. The power supply 11 and the rectifier or the constant potential instrument 9 act as constant voltage power supplies to apply an anode current to the auxiliary anode arranged inside the cable sheath repair layer, and form a conductive loop between the auxiliary anode 5 in the solid electrolyte sealing material and the cathode access point 7 set on the high-strength steel wire through the solid electrolyte sealing material 4, so that the high-strength steel wire produces cathode polarization, thereby preventing further electrochemical corrosion of the cable. The voltmeter 12 and the ammeter 13 measure the potential of the protected high-strength steel wire at the reference electrode, and measure the cathodic protection current. The potential data of the cable steel wire can be obtained in real time through the reference electrode, potential and current measuring device (voltmeter 12 and ammeter 13) to ensure that it is within the protected range; if the monitoring data deviates from the protected range due to deviations or changes in environmental factors, the output parameters of the rectifier or constant potential instrument and the resistance value of the electronic variable resistor are adjusted by the automatic control program to ensure that the actual potential value data of the cable high-strength steel wire is within the target potential value range.

[0033] Detecting and controlling the potential value data of the cable includes the following steps: a reference electrode is used to detect the potential measurement value data of the high-strength steel wire of the cable, and an electronic variable resistor is used to adjust and control the potential value of the high-strength steel wire; comparing the target potential value data of the high-strength steel wire of the cable with the collected actual potential value data of the cable, and adjusting the resistance value of the electronic variable resistor and the output parameters of the rectifier or constant potentiostat according to the comparison result information.

[0034] The cross-sectional diagram of the cable structure after repair is as follows: Figure 1 As shown in the partial enlarged image on the right (red frame on the right), from this image and Figure 2 and Figure 3 It can be seen that the high-strength steel wire 1 is located at the innermost side, the solid electrolyte sealing material 4 is filled on the outside of the waterproof insulating coating material layer 3 at the damaged part of the sheath, and an auxiliary anode 5 insulated and separated from the high-strength steel wire 1 is provided inside the solid electrolyte sealing material 4; the wrapping tape 81 is located on the outside of the damaged part 2 of the cable sheath, and the high-density polyethylene sheath 82 is located on the outside of the wrapping tape 81, forming an anti-corrosion layer structure of the cable structure after maintenance.

[0035] Since the reference electrode is set at a point, Figure 1 The reference electrode is not shown in the figure. However, in general, the measuring end of the reference electrode is built into the solid electrolyte sealing material, insulated from the high-strength steel wire at the damaged sheath in the cable, and the other end is connected to the reference electrode of the rectifier or constant potential instrument through an insulated shielded wire.

[0036] Figure 4The present invention is a flow chart of the electrochemical corrosion protection method in the cable structure. The auxiliary anode in the solid electrolyte sealing material is connected to the positive electrode of the rectifier or the constant potential instrument through an electronic variable resistor, the cathode access point on the high-strength steel wire in the cable is connected to the negative electrode of the rectifier or the constant potential instrument through an insulated shielded wire, the reference electrode is connected to the reference electrode of the rectifier or the constant potential instrument through an insulated shielded wire, and the rectifier or the constant potential instrument is connected to a power source (battery), so as to form an electrochemical corrosion protection system for the high-strength steel wire of the cable at the damaged sheath. The solid electrolyte sealing material forms a conductive loop between the auxiliary anode in the solid electrolyte sealing material and the cathode access point set on the high-strength steel wire, so that the high-strength steel wire produces cathode polarization, thereby preventing the high-strength steel wire from further electrochemical corrosion. The electrochemical corrosion protection system of the bridge cable anti-corrosion repair layer and the high-strength steel wire of the cable at the damaged sheath can automatically adjust the output of the protection current according to the changes in working conditions, so that the high-strength steel wire of the cable is always within a good protection potential range.

[0037] The present invention provides an anti-corrosion repair method for a damaged cable sheath, which can overcome the shortcomings of the repair method in the prior art and propose a completely sealed anti-corrosion method. In addition, the high-strength steel wire electrochemical anti-corrosion system and the physical anti-corrosion layer (wrapping tape and heat-shrinkable high-density polyethylene sheath) are combined to provide multiple protections for the cable high-strength steel wire, thereby further improving the durability of the cable structure.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for anti-corrosion maintenance of cable sheath damage and cable high-strength steel wire, characterized in that: Here are the steps: (1) Apply the waterproof insulating coating material to the gaps around the damaged part of the cable sheath and the high-strength steel wire, and leave the high-strength steel wire exposed; (2) After the waterproof insulation coating material solidifies, fill the solid electrolyte sealing material into the damaged part of the sheath; (3) The measuring ends of the auxiliary anode and the reference electrode are placed inside the solid electrolyte sealing material and insulated from the high-strength steel wire at the damaged part of the sheath inside the cable; (4) After the solid electrolyte sealing material solidifies, the damaged part of the cable is wrapped with a physical anti-corrosion layer to form a closed anti-corrosion system at the damaged part of the sheath; (5) The auxiliary anode is connected to an electronic variable resistor, a rectifier or a constant potentiostat in sequence; the other end of the reference electrode and the cathode access point on the high-strength steel wire of the cable are connected to the rectifier or the constant potentiostat, and the rectifier or the constant potentiostat is connected to a power supply.

2. The anti-corrosion maintenance method for cable sheath damage and cable high-strength steel wire according to claim 1 is characterized in that: Before applying the waterproof insulating coating material in step (1), it is also necessary to clean the surface stains and rust layer of the damaged part of the cable sheath.

3. The anti-corrosion maintenance method for cable sheath damage and cable high-strength steel wire according to claim 2 is characterized in that: In step (3), the auxiliary anode is any one or more combinations of carbon fiber cloth, lead-silver anode, platinum anode, mixed metal oxide anode, strip auxiliary anode and conductive coating anode material.

4. The anti-corrosion maintenance method for cable sheath damage and cable high-strength steel wire according to claim 3 is characterized in that: In the step (3), the reference electrode is made of mercurous sulfate electrode or calomel electrode.

5. The anti-corrosion maintenance method for cable sheath damage and cable high-strength steel wire according to claim 4 is characterized in that: The physical anti-corrosion layer in step (4) includes a wrapping tape and a high-density polyethylene sheath.

6. The method for anti-corrosion maintenance of cable sheath damage and cable high-strength steel wire according to claim 5, characterized in that: In step (4), the wrapping tape is wrapped around the damaged part of the cable to form airtight protection.

7. The anti-corrosion maintenance method for cable sheath damage and cable high-strength steel wire according to claim 6 is characterized in that: In the step (4), the high-density polyethylene sheath is heat-melted and welded to the outer side of the wrapping tape along the longitudinal direction of the cable by a hot-melt welding gun.

8. The method for anti-corrosion maintenance of cable sheath damage and cable high-strength steel wire according to claim 7, characterized in that: The high-strength steel wire is also connected with a voltmeter.

9. An anti-corrosion repair structure prepared by the anti-corrosion repair method according to any one of claims 1 to 8, characterized in that: The anti-corrosion maintenance structure comprises a waterproof insulating coating material layer (3) at the gaps around the damaged part (2) of the cable sheath and the high-strength steel wire, and a physical anti-corrosion layer (8) sleeved on the outside of the cable sheath; a solid electrolyte sealing material (4) is provided between the waterproof insulating coating material layer (3) and the physical anti-corrosion layer (8); the solid electrolyte sealing material (4) contains an auxiliary anode (5) and a measuring end of a reference electrode (6); the auxiliary anode (5), the other end of the reference electrode (6) and a cathode access point (7) on the high-strength steel wire (1) in the cable are all connected to a power source (11) via a rectifier or a constant potential instrument (9); the auxiliary anode (5) and the rectifier or the constant potential instrument (9) are connected via an electronic variable resistor (10); and a voltmeter (12) is connected to the high-strength steel wire (1).

10. The anti-corrosion repair structure according to claim 9, characterized in that: The physical anti-corrosion layer (8) comprises a wrapping tape (81) and a high-density polyethylene sheath (82) from inside to outside.

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