A method and system for anti-corrosion and toughening construction of high-speed railway steel structure canopy columns

Abstract

The present invention relates to the field of high-speed railway station construction, in particular to the field of high-speed railway steel structure canopy column construction, and specifically to a high-speed railway steel structure canopy column anti-corrosion and toughening construction method and system, which solves the problem in the prior art that ECC materials cannot be well bonded to steel structures and cannot achieve long-term corrosion protection of steel structure canopy columns. The CECC layer can be firmly bonded to the surface of the steel structure canopy column through a conductive structural adhesive layer. At the same time, a current cathodic protection system prevents corrosion caused by electron loss, ensuring long-term corrosion protection. The method includes a steel structure canopy column and a direct current power supply, wherein a plurality of anchor nails are arranged on the column body of the steel structure canopy column; a conductive structural adhesive layer is provided on the surface of the steel structure canopy column, and the thickness of the conductive structural adhesive layer does not exceed the length of the anchor nail exposed on the surface of the steel structure canopy column, and a CECC layer is provided on the outer side of the conductive structural adhesive layer.

Description

Technical Field

[0001] The present invention relates to the field of high-speed railway station construction, in particular to the field of high-speed railway steel structure canopy column construction, and specifically to a high-speed railway steel structure canopy column anti-corrosion and toughening construction method and system. Background Art

[0002] High-speed rail stations are a vital component of my country's railway network. Steel structures, due to their excellent mechanical properties, seismic resistance, and construction efficiency, are the preferred material for station buildings and platform canopies. However, steel columns are susceptible to atmospheric corrosion, which reduces their wall thickness and weakens their mechanical properties. This can compromise the structural safety and functionality of steel canopy columns, posing a threat to the safety of adjacent railway lines.

[0003] The continuous expansion of my country's high-speed rail network has made increasing train speeds on existing lines a key measure for improving rail transportation efficiency. However, with increasing operating time, corrosion has become a common problem in the steel structures of station buildings and platform canopy columns at many older stations. In particular, high-speed rail steel canopy columns, as critical load-bearing components, are subject to increased wind pressure. This additional pressure can easily lead to fatigue damage on the canopy columns under wind loads, accelerating corrosion of the steel structure and posing a serious threat to train safety. Therefore, strengthening the anti-corrosion and corrosion prevention treatment of high-speed rail steel canopy columns and their structural reinforcement is crucial.

[0004] Currently, the maintenance of high-speed rail steel canopy columns relies primarily on manual painting. However, the limited nighttime "windows" for construction, the low temperatures and humidity in the early morning, and the difficulty of working at height all pose significant challenges. Furthermore, painting operations are carried out on schedule, and frequent maintenance operations lead to significant cost increases.

[0005] To address this issue, those skilled in the art have attempted numerous approaches, such as ECC materials (high-ductility cement-based materials). While various ECC materials have been developed domestically and internationally, their excellent mechanical properties, durability, and environmental friendliness have led to their widespread application in masonry reinforcement. For example, the invention patent for "A Method for Repairing Corroded Reinforced Concrete Components Using ECC," published in Chinese Patent Publication (Announcement) No. CN116181109A, while capable of restoring the bearing capacity of concrete components, fails to prevent steel corrosion. Furthermore, and more importantly, according to existing engineering practices, the interface mechanical properties between ECC and steel structures are relatively poor, limiting its direct application in steel reinforcement. Specifically, while ECC materials excel in masonry reinforcement, significantly improving the integrity and crack resistance of structures, they lack the ability to bond effectively to steel structures and are unable to achieve the long-term corrosion protection goals of steel structures. Summary of the Invention

[0006] The present invention aims to provide a method and system for anti-corrosion and toughening construction of high-speed railway steel structure canopy columns, which solves the problem in the existing technology that ECC materials cannot adhere well to steel structures and cannot achieve long-term corrosion protection of steel structure canopy columns. The CECC layer can be firmly bonded to the surface of the steel structure canopy column through the conductive structural adhesive layer. At the same time, the current cathodic protection system prevents corrosion caused by electron loss, ensuring long-term corrosion protection.

[0007] The present invention is achieved through the following technical solutions:

[0008] A method for anti-corrosion and toughening construction of high-speed railway steel structure canopy columns comprises the following steps:

[0009] S10. First, treat the surface of the steel structure canopy column by mechanically sandblasting to remove corrosion products, oxide scale and old paint film attachments that are not firmly attached on the metal surface of the steel structure canopy column;

[0010] S20. Evenly weld anchor nails on the column of the steel structure canopy column;

[0011] S30. Apply epoxy resin conductive structural adhesive mixed with carbon fiber to the surface of the steel structure canopy column to form a conductive structural adhesive layer. The thickness of the conductive structural adhesive layer shall not exceed the length of the anchor nail exposed on the surface of the steel structure canopy column.

[0012] S40, setting a plurality of planted reinforcement bars distributed around the steel structure canopy columns on the ground, setting a mesh electrode on the outer side of the planted reinforcement bars, and the mesh electrode surrounding the column base of the steel structure canopy columns;

[0013] S50, after the conductive structural adhesive layer is initially solidified, spraying a carbon-doped high-ductility cement-based material on the surface of the conductive structural adhesive layer to form a CECC layer;

[0014] S60. Prepare a DC power supply, install a cathode connector on the top of the steel structure canopy column, connect the cathode end of the DC power supply to the cathode connector through a wire, and connect the anode end of the DC power supply to the mesh electrode through a wire to form a current cathodic protection system.

[0015] Furthermore, the epoxy resin conductive structural adhesive is uniformly mixed with carbon fibers during the preparation process, and the preparation process includes the following steps:

[0016] S301, preparing short-cut carbon fibers, the mass of which accounts for 0.5% of the mass of the epoxy resin colloid, and fully dispersing them by ultrasonic dispersion treatment;

[0017] S302, the epoxy resin component and the curing agent component are mixed evenly in a mass ratio of 1:1, and then the carbon fibers dispersed in step S301 are added and stirred evenly to complete the preparation of the epoxy resin conductive structural adhesive.

[0018] Furthermore, the carbon-doped high-ductility cement-based material includes gel material, natural river sand, thickener, water reducer, water, PVA fiber, carbon fiber and carbon nanotubes, wherein the gel material includes cement, primary fly ash and silica fume.

[0019] Furthermore, the mass of cement is set to 1, the amount of first-grade fly ash is 1.7 times the mass of cement, the amount of silica fume is 0.3 times the mass of cement, the amount of natural river sand is 1.3 times the mass of cement, the amount of thickener is 0.15% of the mass of cement, the water-cement ratio is 0.35, the amount of water reducer is 0.5% of the amount of cement, and the volume content of PVA fiber is 2%; according to the mass ratio of gel material, the addition concentration of carbon nanotubes is 0.3%, and the addition concentration of carbon fiber is 0.1%.

[0020] Furthermore, the preparation process of the carbon-doped high-ductility cement-based material includes the following steps:

[0021] S501. Add cement, first-grade fly ash, natural river sand, and thickener solid components into a dedicated mixer in sequence and stir;

[0022] S502, preparing a carbon-based dispersion from carbon nanotubes, carbon fibers, silica fume, and a water reducer;

[0023] Add evenly mixed water and carbon-based dispersion into the dedicated mixer of S501 and stir;

[0024] S503. Finally, add PVA fiber and stir.

[0025] Furthermore, in step S502, the carbon-based dispersion is prepared by first mixing carbon nanotubes, carbon fibers, and a water reducer in water and ultrasonically treating the mixture for 30 minutes;

[0026] Silica fume was then added and stirred by ultrasound for 10 min.

[0027] Furthermore, in step S10, the corrosion products, oxide scale and weakly attached old paint film on the metal surface of the steel structure canopy column are removed by mechanical sandblasting; the surface is polished to Sa2.5 level and the surface roughness Rz50μm-100μm;

[0028] In step S20 , the spacing between the anchors is 100 mm to 300 mm.

[0029] Furthermore, in step S30, the thickness of the conductive structural adhesive layer is 2-5 mm;

[0030] In step S50 , the thickness of the CECC layer is 20-40 mm.

[0031] Furthermore, the DC power supply is electrically connected to a solar power supply device or a wind power supply device.

[0032] A high-speed railway steel structure canopy column anti-corrosion and toughening system is manufactured using the above-mentioned high-speed railway steel structure canopy column anti-corrosion and toughening construction method, comprising a steel structure canopy column and a DC power supply, wherein a plurality of anchor nails are provided on the column body of the steel structure canopy column;

[0033] The surface of the steel structure canopy column is provided with a conductive structural adhesive layer, the thickness of the conductive structural adhesive layer does not exceed the length of the anchor nail exposed on the surface of the steel structure canopy column, and the outer side of the conductive structural adhesive layer is provided with a CECC layer;

[0034] The CECC layer is pre-embedded with a mesh electrode, which surrounds the column foot of the steel structure canopy column. The top of the steel structure canopy column is provided with a cathode connector. The cathode end of the DC power supply is connected to the cathode connector through a wire, and the anode end is connected to the mesh electrode through a wire.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] 1. The present invention provides a method for anti-corrosion and toughening construction of high-speed railway steel structure canopy columns. The method uses epoxy resin conductive structural adhesive to effectively improve the interfacial bonding strength between the CECC layer and the steel structure canopy column. At the same time, the method cooperates with anchor nails to improve the firmness of the CECC layer and the steel structure canopy column. The CECC layer further improves the strength of the steel structure canopy column, compensating for the bending bearing capacity and toughness of the corroded high-speed railway steel structure canopy column.

[0037] Carbon fiber is incorporated into the conductive structural adhesive layer, and the CECC layer is carbon-based. Combined with metal anchors, the conductive structural adhesive layer, CECC layer, and steel structure canopy columns are able to conduct electricity and act as cathodes. Implementing current cathodic protection technology through the current cathodic protection system effectively suppresses the chemical corrosion galvanic reaction of the high-speed rail steel structure canopy columns, ensuring that the potential of the high-speed rail steel structure canopy columns is always lower than the surrounding environment, thereby preventing corrosion caused by electron loss. This method effectively improves the durability of the high-speed rail steel structure canopy columns and significantly reduces maintenance costs.

[0038] The anti-corrosion and toughening system for high-speed railway steel structure canopy columns provided by the present invention firmly bonds the CECC layer to the surface of the steel structure canopy column through a conductive structural adhesive layer. The high ductility of the carbon-doped CECC layer helps to compensate for the strength loss of the column due to corrosion, thereby achieving toughening and strengthening of the column. At the same time, the current cathodic protection system effectively suppresses the chemical corrosion galvanic reaction of the high-speed railway steel structure canopy column, ensuring that the potential of the high-speed railway steel structure canopy column is always lower than that of the surrounding environment, thereby preventing corrosion caused by electron loss, effectively improving the durability of the high-speed railway steel structure canopy column, and significantly reducing maintenance costs.

[0039] 2. Carbon fiber is added to the conductive structural adhesive layer, and the CECC layer is doped with carbon base to improve conductivity, avoiding the problem that the steel structure canopy column cannot pass current due to rust and corrosion. At the same time, with the help of metal anchor nails, the conductive structural adhesive layer, CECC layer and steel structure canopy column can conduct electricity and act as cathode, thereby improving corrosion resistance;

[0040] 3. The carbon-doped high-ductility cement-based material includes gel material, natural river sand, thickener, water reducer, water, PVA fiber, carbon fiber and carbon nanotubes, which ensures that the CECC layer has good high ductility, thereby achieving toughening and strengthening of the column while ensuring good electrical conductivity;

[0041] 4. Traditional paints and coatings require regular re-application to maintain their anti-corrosion effectiveness, while the technical solution provided by the present invention only requires regular monitoring and maintenance, eliminating the need for frequent re-application. The present invention utilizes impressed current cathodic protection technology to protect the entire metal structure, including the interior of the column, whereas paint and coatings cannot provide such comprehensive protection. Although the cathodic protection system of the present invention requires energy to provide current, it reduces the use of chemicals (such as volatile organic compounds in paint) and has a smaller impact on the environment.

[0042] 5. The present invention provides a lower-cost anti-corrosion solution. Although the initial cost of the present invention is higher, in the long run, the overall cost is lower due to the reduced need for maintenance and re-coating. The CECC layer can adapt to different environmental conditions, such as high temperature, low temperature, high humidity, etc., while the performance of paint coatings may vary significantly due to environmental conditions;

[0043] Impressed current cathodic protection technology can evaluate the corrosion status of high-speed railway steel structure canopy columns through potential measurement and other monitoring technologies to ensure that the structure is always protected. In comparison, monitoring the condition of paint coatings is usually more difficult. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a schematic diagram of the application of the high-speed railway steel structure canopy column anti-corrosion and toughening system of the present invention in a high-speed railway canopy platform;

[0045] Figure 2 This is a schematic diagram of the interior of the high-speed railway steel structure canopy column anti-corrosion and toughening system according to the present invention;

[0046] Figure 3 for Figure 2 Schematic top view of

[0047] Figure 4 Schematic diagram of mesh electrodes surrounding rebar;

[0048] In the figure: 1. Steel structure canopy column, 2. Anchor nail, 3. CECC layer, 4. Mesh electrode, 5. Conductive structural adhesive layer, 6. Anchor bar, 7. Cathode connector, 8. Solar power supply equipment, 9. Wind power supply equipment, 10. DC power supply. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0050] In the description of the invention, it should be understood that the terms "front", "rear", "up", "down", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the invention.

[0051] In order to solve the problems in the background technology, such as Figure 1-Figure 3 As shown, this embodiment provides a corrosion-resistant and toughening system for high-speed railway steel canopy columns. The system primarily comprises a steel canopy column 1, a DC power supply 10, and a mesh electrode 4. Several iron anchors 2 are welded to the steel canopy column 1. A 2-5 mm thick conductive structural adhesive layer 5 is applied to the surface of the steel canopy column 1. The thickness of the conductive structural adhesive layer 5 does not exceed the length of the anchors 2 exposed on the surface of the steel canopy column 1, ensuring that the anchors 2 are exposed from the conductive structural adhesive layer 5. A 20-40 mm thick CECC layer 3 is applied to the outside of the conductive structural adhesive layer 5. In this embodiment, the CECC layer is made of a high-ductility cement-based material (CECC) with a carbon-doped base. A mesh electrode 4 is embedded in the CECC layer 3 and surrounds the base of the steel canopy column 1. A cathode connector 7 is connected to the top of the steel canopy column 1. The cathode end of the DC power supply 10 is connected to the cathode connector 7 via a wire, and the anode end is connected to the mesh electrode 4 via a wire.

[0052] In this embodiment, for environmental protection, direct current generated by wind energy or solar energy can be used, and the direct current power source is electrically connected to the solar power supply device 8 and the wind power supply device 9.

[0053] The above-mentioned high-speed railway steel structure canopy column anti-corrosion and toughening system firmly bonds the CECC layer 3 to the surface of the steel structure canopy column 1 through the conductive structural adhesive layer 5. The high ductility characteristics of the carbon-doped CECC layer 3 help to compensate for the strength loss of the column due to corrosion, thereby achieving toughening and strengthening of the column; the CECC layer 3 and the conductive structural adhesive layer 5 are both conductive and form an integral cathode with the steel structure canopy column 1. The chemical corrosion galvanic cell reaction of the high-speed railway steel structure canopy column is effectively suppressed through the current cathodic protection system, ensuring that the potential of the high-speed railway steel structure canopy column is always lower than the surrounding environment, thereby preventing corrosion caused by electron loss, effectively improving the durability of the high-speed railway steel structure canopy column, and significantly reducing maintenance costs.

[0054] In order to construct the above-mentioned high-speed railway steel structure canopy column anti-corrosion and toughening system, this embodiment discloses a high-speed railway steel structure canopy column anti-corrosion and toughening construction method, including the following steps:

[0055] S10. First, treat the surface of the steel structure canopy column 1 by mechanically sandblasting to remove corrosion products, oxide scale, and loosely attached old paint film on the metal surface of the steel structure canopy column 1, and polish it to Sa2.5 level. The surface roughness is controlled within the range of Rz50μm to 100μm.

[0056] S20, evenly welding a plurality of anchor nails 2 on the column body of the steel structure canopy column 1, with the spacing of the anchor nails 2 being 100 mm to 300 mm, which is conducive to enhancing the conductive performance of the current cathodic protection system;

[0057] S30. Applying a conductive structural adhesive made of epoxy resin mixed with carbon fiber to the surface of the steel structure canopy column 1 to form a conductive structural adhesive layer 5. The thickness of the conductive structural adhesive layer 5 does not exceed the length of the anchor 2 exposed on the surface of the steel structure canopy column 1. In this embodiment, the thickness of the conductive structural adhesive layer 5 is 2-5 mm.

[0058] In this embodiment, the epoxy resin conductive structural adhesive is uniformly mixed with carbon fibers during the preparation process, and the preparation process includes the following steps:

[0059] S301, preparing short-cut carbon fibers, the mass of which accounts for 0.5% of the mass of the epoxy resin colloid, and fully dispersing them by ultrasonic dispersion treatment;

[0060] S302, mixing the epoxy resin component and the curing agent component in a mass ratio of 1:1, then adding the carbon fibers dispersed in step S301, and continuing to stir evenly to complete the preparation of the epoxy resin conductive structural adhesive;

[0061] S40, such as Figure 4As shown, a plurality of planting bars 6 distributed around the steel structure canopy column 1 are arranged on the ground. The planting bars 6 are arranged with a spacing of 15mm to 20mm from the column body of the steel structure canopy column 1. After the planting bars 6 are fixed to the ground, a mesh electrode 4 is arranged on the outer side of the planting bars 6. The mesh electrode 4 is made of copper and has good electrical conductivity, so that the mesh electrode 4 surrounds the column foot of the steel structure canopy column 1.

[0062] S50, after the conductive structural adhesive layer 5 is initially solidified, a carbon-doped high-ductility cement-based material is sprayed on the surface of the conductive structural adhesive layer 5 to form a CECC layer 3, with a coating thickness of 20 mm to 40 mm, so that the mesh electrode 4 and the embedded steel bar 6 are both located within the CECC layer 3;

[0063] In this embodiment, in order to ensure that the CECC layer 3 has high toughness while also achieving good electrical conductivity, a carbon-doped high-ductility cement-based material includes a gel material, natural river sand, a thickener, a water reducer, water, PVA fibers, carbon fibers, and carbon nanotubes. The gel material includes cement, primary fly ash, and silica fume. The mass of cement is set to 1, the amount of primary fly ash is 1.7 times the mass of cement, the amount of silica fume is 0.3 times the mass of cement, the amount of natural river sand is 1.3 times the mass of cement, the amount of thickener is 0.15% of the mass of cement, the water-binder ratio is 0.35, the amount of water reducer is 0.5% of the mass of cement, and the volume content of PVA fibers is 2%. Based on the mass ratio of the gel material, the concentration of carbon nanotubes is 0.3%, and the concentration of carbon fibers is 0.1%.

[0064] In this embodiment, the preparation process of the carbon-doped high-ductility cement-based material includes the following steps:

[0065] S501. Add cement, first-grade fly ash, natural river sand, and thickener solid components in a dedicated mixer in sequence and stir slowly for 2 minutes.

[0066] S502, preparing carbon nanotubes, carbon fibers, silica fume and a water reducer into a carbon-based dispersion; the preparation process of the carbon-based dispersion is as follows: first, mixing the carbon nanotubes, carbon fibers and a water reducer in water and ultrasonically treating them for 30 minutes; then adding silica fume and stirring them by ultrasonication for 10 minutes.

[0067] Add evenly mixed water and carbon-based dispersion to the dedicated mixer S501 and stir slowly for 1 minute, then stir rapidly for 2 minutes. By adding the pre-prepared carbon-based dispersion, the carbon nanotubes and carbon fibers can be fully dispersed in the CECC, preventing the carbon-based materials from agglomerating and affecting the conductive properties of the CECC, thereby ensuring the uniformity of the conductive properties.

[0068] S503. Finally, add PVA fiber and stir rapidly for 6 minutes; turn the mixture over manually and stir rapidly again for 1 minute;

[0069] S60, prepare a DC power supply, install a cathode connector 7 on the top of the steel structure canopy column 1, connect the cathode end of the DC power supply to the cathode connector 7 through a wire, and connect the anode end of the DC power supply to the mesh electrode 4 through a wire to form a current cathodic protection system.

[0070] The anti-corrosion and toughening construction method for the high-speed railway steel structure canopy column provided in this embodiment can effectively improve the interface bonding strength between the CECC layer 3 and the steel structure canopy column 1 through the epoxy resin conductive structural adhesive, and at the same time cooperate with the anchor 2 to improve the firmness of the CECC layer 3 and the steel structure canopy column 1. The CECC layer 3 further improves the strength of the steel structure canopy column 1, compensating for the bending bearing capacity toughness of the corroded high-speed railway steel structure canopy column; carbon fiber is added to the conductive structural adhesive layer 5, and the CECC layer 3 is compounded with a carbon base. At the same time, the metal anchor 2 is used to enable the conductive structural adhesive layer 5, the CECC layer 3 and the steel structure canopy column 1 to conduct electricity and act as a cathode. The current cathodic protection technology is implemented through the current cathodic protection system, effectively suppressing the chemical corrosion galvanic cell reaction of the high-speed railway steel structure canopy column, ensuring that the potential of the high-speed railway steel structure canopy column is always lower than the surrounding environment, thereby preventing corrosion caused by electron loss. This method effectively improves the durability of the high-speed railway steel structure canopy column and significantly reduces maintenance costs.

[0071] Traditional paint coatings require regular re-coating to maintain their anti-corrosion effect. In comparison, the technical solution provided in this embodiment only requires regular monitoring and maintenance, and does not require frequent re-coating. This embodiment uses impressed current cathodic protection technology to protect the entire metal structure, including the interior of the column, while paint coatings cannot provide such comprehensive protection. Although the cathodic protection system of the present invention requires energy to provide current, it reduces the use of chemicals (such as volatile organic compounds in paint) and has less impact on the environment. Although the initial cost of this embodiment is higher, in the long run, the overall cost is lower due to the reduced need for maintenance and re-coating. The CECC layer 3 can adapt to different environmental conditions, such as high temperature, low temperature, high humidity, etc., while the performance of paint coatings may vary significantly due to environmental conditions.

Claims

1. A method for anti-corrosion and toughening construction of high-speed railway steel structure canopy columns, characterized in that: The following steps are involved: S10, firstly treat the surface of the steel structure canopy column (1), and remove the corrosion products, oxide scale and old paint film attachments with weak adhesion on the metal surface of the steel structure canopy column (1) by mechanical sandblasting; S20, uniformly welding anchor nails (2) on the column body of the steel structure canopy column (1); S30, brushing the surface of the steel structure canopy column (1) with epoxy resin conductive structural adhesive mixed with carbon fiber to form a conductive structural adhesive layer (5), wherein the thickness of the conductive structural adhesive layer (5) does not exceed the length of the anchor nail (2) exposed on the surface of the steel structure canopy column (1); S40, setting a plurality of planted bars (6) distributed around the steel structure canopy column (1) on the ground, setting a mesh electrode (4) on the outer side of the planted bars (6), and the mesh electrode (4) surrounding the column foot of the steel structure canopy column (1); S50, after the conductive structural adhesive layer (5) is initially solidified, spraying a carbon-doped high-ductility cement-based material on the surface of the conductive structural adhesive layer (5) to form a CECC layer (3); the carbon-doped high-ductility cement-based material includes a gel material, natural river sand, a thickener, a water reducer, water, PVA fiber, carbon fiber and carbon nanotubes, wherein the gel material includes cement, primary fly ash and silica fume; S60, prepare a DC power supply (10), install a cathode connector (7) on the top of the steel structure canopy column (1), connect the cathode end of the DC power supply to the cathode connector (7) through a wire, and connect the anode end of the DC power supply (10) to the mesh electrode (4) through a wire to form a current cathode protection system.

2. The anti-corrosion and toughening construction method for high-speed railway steel structure canopy columns according to claim 1 is characterized in that: The epoxy resin conductive structural adhesive is uniformly mixed with carbon fibers during the preparation process, and its preparation includes the following steps: S301, preparing short-cut carbon fibers, the mass of which accounts for 0.5% of the mass of the epoxy resin colloid, and fully dispersing them by ultrasonic dispersion treatment; S302, the epoxy resin component and the curing agent component are mixed evenly in a mass ratio of 1:1, and then the carbon fibers dispersed in step S301 are added and stirred evenly to complete the preparation of the epoxy resin conductive structural adhesive.

3. The anti-corrosion and toughening construction method for high-speed railway steel structure canopy columns according to claim 2 is characterized in that: The mass of cement is set to 1, the amount of first-grade fly ash is 1.7 times the mass of cement, the amount of silica fume is 0.3 times the mass of cement, the amount of natural river sand is 1.3 times the mass of cement, the amount of thickener is 0.15% of the mass of cement, the water-cement ratio is 0.35, the amount of water reducer is 0.5% of the mass of cement, and the volume content of PVA fiber is 2%; according to the mass ratio of gel material, the adding concentration of carbon nanotubes is 0.3%, and the adding concentration of carbon fiber is 0.1%.

4. The anti-corrosion and toughening construction method for high-speed railway steel structure canopy columns according to claim 3 is characterized in that: The preparation process of the carbon-doped high-ductility cement-based material includes the following steps: S501. Add cement, first-grade fly ash, natural river sand, and thickener solid components into a dedicated mixer in sequence and stir; S502, preparing a carbon-based dispersion from carbon nanotubes, carbon fibers, silica fume, and a water reducer; Add evenly mixed water and carbon-based dispersion into the dedicated mixer of S501 and stir; S503. Finally, add PVA fiber and stir.

5. The anti-corrosion and toughening construction method for high-speed railway steel structure canopy columns according to claim 4 is characterized in that: In step S502 , the carbon-based dispersion is prepared by first mixing carbon nanotubes, carbon fibers, and a water reducer in water and ultrasonically treating the mixture for 30 minutes; Silica fume was then added and stirred by ultrasound for 10 min.

6. The anti-corrosion and toughening construction method for high-speed railway steel structure canopy columns according to claim 1 is characterized in that: In step S10, the corrosion products, oxide scale and loosely attached old paint film on the metal surface of the steel structure canopy column (1) are removed by mechanical sandblasting; the surface is polished to Sa2.5 level and the surface roughness Rz50μm-100μm; In step S20, the spacing between the anchors (2) is 100 mm to 300 mm.

7. The anti-corrosion and toughening construction method for high-speed railway steel structure canopy columns according to claim 1 is characterized in that: In step S30, the thickness of the conductive structural adhesive layer (5) is 2-5 mm; In step S50, the thickness of the CECC layer (3) is 20-40 mm.

8. The anti-corrosion and toughening construction method for high-speed railway steel structure canopy columns according to any one of claims 1 to 7, characterized in that: The DC power supply is electrically connected to a solar power supply device or a wind power supply device.

9. A high-speed railway steel structure canopy column anti-corrosion and toughening system, characterized in that: The high-speed railway steel structure canopy column is manufactured by the anti-corrosion and toughening construction method of claim 1, comprising a steel structure canopy column (1) and a DC power supply, wherein a plurality of anchor nails (2) are provided on the column body of the steel structure canopy column (1); The surface of the steel structure canopy column (1) is provided with a conductive structural adhesive layer (5), the thickness of the conductive structural adhesive layer (5) does not exceed the length of the anchor nail (2) exposed on the surface of the steel structure canopy column (1), and the outer side of the conductive structural adhesive layer (5) is provided with a CECC layer (3); The CECC layer (3) is pre-buried with a mesh electrode (4), the mesh electrode (4) surrounds the column foot of the steel structure canopy column (1), a cathode connector (7) is provided at the top of the steel structure canopy column (1), the cathode end of the DC power supply is connected to the cathode connector (7) via a wire, and the anode end is connected to the mesh electrode (4) via a wire.

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