Anti-corrosion and toughening construction method and system for high-speed rail steel structure canopy column

Abstract

The invention relates to the field of high-speed rail station construction, in particular to the field of high-speed rail steel structure canopy column construction, in particular to an anti-corrosion and toughening construction method and system for a high-speed rail steel structure canopy column, and solves the problems that in the prior art, a steel structure cannot be well bonded with an ECC material, and long-term corrosion prevention of the steel structure canopy column cannot be achieved. A CECC layer can be firmly bonded to the surface of a steel structure canopy column through a conductive structural adhesive layer, meanwhile, a current cathode protection system prevents the corrosion phenomenon caused by electron loss, long-term corrosion prevention is guaranteed, the steel structure canopy column comprises the steel structure canopy column and a direct-current power source, and a plurality of ground anchors are arranged on a column body of the steel structure canopy column; a conductive structural adhesive layer is arranged on the surface of the steel structure canopy column, the thickness of the conductive structural adhesive layer does not exceed the length, exposed on the surface of the steel structure canopy column, of the anchor nail, and a CECC layer is arranged 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, especially to the field of construction of high - speed railway steel structure canopy columns, and specifically relates to an anti - corrosion and toughening construction method and system for high - speed railway steel structure canopy columns. Background Art

[0002] As an important part of China's railway network, steel structures have become the preferred materials for the construction of high - speed railway station houses and platform canopies due to their excellent mechanical properties, seismic performance, and construction efficiency. However, steel structure columns are vulnerable to atmospheric corrosion, which reduces their wall thickness and weakens their mechanical properties, resulting in damage to the structural safety and functions of high - speed railway steel structure canopy columns and posing a threat to the safety of adjacent railway lines.

[0003] The continuous expansion of China's high - speed railway network has made improving the train operation speed on existing lines a key measure to enhance railway transportation efficiency. However, with the increase in operation time, corrosion problems have generally occurred in the steel structures of the station houses and platform canopy columns of a large number of old stations. Especially for the high - speed railway steel structure canopy columns, as key load - bearing components, the wind pressure they bear has also increased. This additional pressure easily causes fatigue damage to the canopy columns under wind load, thereby accelerating steel structure corrosion and posing a serious threat to train operation safety. In view of this, it is crucial to strengthen the anti - corrosion, corrosion - resistance treatment, and structural reinforcement of high - speed railway steel structure canopy columns.

[0004] Currently, the maintenance of high - speed railway steel structure canopy columns mainly relies on manual painting operations. However, the limited "skylight point" construction time at night, the challenges of low temperature and humidity in the early morning, and the difficulty of high - altitude operations all pose great challenges to maintenance work. At the same time, painting operations are carried out on a regular basis, and frequent maintenance operations have also led to a significant increase in costs.

[0005] To solve this problem, technicians in this field have tried many methods, such as ECC materials (engineered cementitious composites). Although various ECC materials have been developed at home and abroad and have been widely used in the field of masonry structure reinforcement due to their excellent mechanical properties, durability, and environmental characteristics. For example, the invention patent "A method for repairing corroded reinforced concrete members using ECC" with Chinese patent publication (announcement) number CN116181109A can restore the bearing capacity of concrete members, but it cannot prevent the corrosion of steel bars. At the same time, more importantly, according to existing engineering practices, the interfacial mechanical properties between ECC and steel structures are relatively poor, which limits its direct application in steel structure reinforcement. Specifically, ECC materials perform well in masonry reinforcement, significantly improving the integrity and crack - resistance of structures. However, for steel structures, ECC cannot bond well with steel structures, and ECC cannot achieve the long - term anti - corrosion goal of steel structures. Summary of the Invention

[0006] The present invention aims to provide an anti-corrosion and toughening construction method and system for the rain shelter columns of high-speed rail steel structures, which solves the problems in the prior art that ECC materials cannot adhere well to steel structures and cannot achieve long-term anti-corrosion of the rain shelter columns of steel structures. It can firmly bond the CECC layer to the surface of the rain shelter columns of steel structures through a conductive structural adhesive layer, and at the same time, the cathodic protection system of electric current prevents the corrosion phenomenon caused by electron loss, ensuring long-term anti-corrosion.

[0007] The present invention is realized through the following technical solutions: An anti-corrosion and toughening construction method for the rain shelter columns of high-speed rail steel structures includes the following steps: S10. First, treat the surface of the rain shelter columns of steel structures, and remove the corrosion products, oxide scales, and poorly adhered old paint film attachments on the metal surface of the rain shelter columns of steel structures by mechanical sandblasting; S20. Uniformly weld anchor bolts on the column bodies of the rain shelter columns of steel structures; S30. Brush an epoxy resin conductive structural adhesive mixed with carbon fiber on the surface of the rain shelter columns of steel structures to form a conductive structural adhesive layer, and the thickness of the conductive structural adhesive layer does not exceed the length of the anchor bolts exposed on the surface of the rain shelter columns of steel structures; S40. Set multiple post-inserted bars around the rain shelter columns of steel structures on the ground, and set a mesh electrode on the outer side of the post-inserted bars, and the mesh electrode surrounds the column feet of the rain shelter columns of steel structures; S50. After the conductive structural adhesive layer starts to set, spray a high-ductility cement-based material with a carbon-based admixture on the outer surface of the conductive structural adhesive layer to form a CECC layer; S60. Prepare a DC power supply, install a cathode connector at the top of the rain shelter columns of steel structures, connect the negative terminal of the DC power supply to the cathode connector through a wire, and connect the positive terminal of the DC power supply to the mesh electrode through a wire to form a cathodic protection system of electric current.

[0008] Furthermore, carbon fiber is uniformly incorporated into the epoxy resin conductive structural adhesive during its preparation, and its production includes the following steps: S301. Prepare chopped carbon fiber, whose mass accounts for 0.5% of the mass of the epoxy resin colloid, and use ultrasonic dispersion treatment to fully disperse it; S302. Mix the epoxy resin component and the curing agent component evenly according to a mass ratio of 1:1, then add the carbon fiber that has been dispersed in step S301, and continue to stir evenly to complete the preparation of the epoxy resin conductive structural adhesive.

[0009] Furthermore, the high-ductility cement-based material with a carbon-based admixture includes a gel material, natural river sand, thickening agent, water-reducing agent, water, PVA fiber, carbon fiber, and carbon nanotubes, wherein the gel material includes cement, grade I fly ash, and silica fume.

[0010] Further, the mass of cement is set to 1, the dosage of Class I fly ash is 1.7 times the mass of cement, the dosage of silica fume is 0.3 times the mass of cement, the dosage of natural river sand is 1.3 times the mass of cement, the dosage of thickener is 0.15% of the mass of cement, the water-binder ratio is 0.35, the dosage of water reducer is 0.5% of the cement dosage, and the volume fraction of PVA fiber is 2%; according to the mass ratio of the gel materials, the addition concentration of carbon nanotubes is 0.3%, and the addition concentration of carbon fibers is 0.1%.

[0011] Further, the preparation process of the high-ductility cementitious material with compound carbon-based admixtures includes the following steps: S501: Add cement, Class I fly ash, natural river sand, and the solid component of the thickener into a special mixer in sequence and stir. S502: Prepare a carbon-based dispersion by mixing carbon nanotubes, carbon fibers, silica fume, and water reducer. Add the uniformly mixed water and the carbon-based dispersion into the special mixer in S501 and stir. S503: Finally, add PVA fibers and stir.

[0012] Further, in step S502, the preparation process of the carbon-based dispersion is as follows: First, take carbon nanotubes, carbon fibers, and water reducer, mix them in water, and perform ultrasonic treatment for 30 minutes. Then add silica fume and perform ultrasonic stirring for 10 minutes.

[0013] Further, in step S10, remove the corrosion products, mill scale, and poorly adherent old paint film attachments on the metal surface of the steel structure awning column by mechanical sandblasting; grind to Sa2.5 level, and the surface roughness is Rz 50μm - 100μm. In step S20, the spacing of the anchor bolts is 100mm to 300mm.

[0014] Further, in step S30, the thickness of the conductive structural adhesive layer is 2 - 5mm. In step S50, the thickness of the CECC layer is 20 - 40mm.

[0015] Further, the DC power supply is electrically connected to a solar power supply device or a wind power supply device.

[0016] A corrosion prevention and toughening system for high-speed rail steel structure awning columns, which is made by using the above-mentioned corrosion prevention and toughening construction method for high-speed rail steel structure awning columns, includes a steel structure awning column and a DC power supply. A number of anchor bolts are provided on the column body of the steel structure awning column; A conductive structural adhesive layer is provided on the surface of the steel structure awning column. The thickness of the conductive structural adhesive layer does not exceed the length of the anchor bolts exposed on the surface of the steel structure awning column, and a CECC layer is provided outside the conductive structural adhesive layer; A mesh electrode is embedded in the CECC layer. The mesh electrode surrounds the column foot of the steel structure awning column for one week. A cathode connector is provided at the top of the steel structure awning column. The negative terminal of the DC power supply is connected to the cathode connector through a wire, and the positive terminal is connected to the mesh electrode through a wire.

[0017] The beneficial effects obtained by the present invention compared with the prior art are as follows: 1. The present invention provides a construction method for anti-corrosion and toughening of high-speed rail steel structure awning columns. The epoxy resin conductive structural adhesive can effectively improve the interfacial adhesion strength between the CECC layer and the high-speed rail steel structure awning column. At the same time, the cooperation of anchor bolts improves the firmness between the CECC layer and the high-speed rail steel structure awning column. The CECC layer further improves the strength of the high-speed rail steel structure awning column, making up for the toughness of the flexural bearing capacity of the corroded high-speed rail steel structure awning column; Carbon fiber is incorporated into the conductive structural adhesive layer, and the CECC layer is compounded with carbon-based materials. At the same time, in cooperation with metal anchor bolts, the conductive structural adhesive layer, the CECC layer and the high-speed rail steel structure awning column can conduct electricity and act as the cathode role. The current cathodic protection technology is implemented through the current cathodic protection system, effectively inhibiting the chemical corrosion primary battery reaction of the high-speed rail steel structure awning column, ensuring that the potential of the high-speed rail steel structure awning column is always lower than the surrounding environment, thereby preventing the corrosion phenomenon caused by electron loss. This method effectively improves the durability of the high-speed rail steel structure awning column and significantly reduces the maintenance cost; The anti-corrosion and toughening system for high-speed rail steel structure awning columns provided by the present invention firmly bonds the CECC layer to the surface of the high-speed rail steel structure awning column through the conductive structural adhesive layer. The high ductility characteristics of the CECC layer compounded with carbon-based materials help to compensate for the strength lost by the column due to corrosion, realizing the toughening and strengthening of the column. At the same time, the chemical corrosion primary battery reaction of the high-speed rail steel structure awning column is effectively inhibited through the current cathodic protection system, ensuring that the potential of the high-speed rail steel structure awning column is always lower than the surrounding environment, thereby preventing the corrosion phenomenon caused by electron loss, effectively improving the durability of the high-speed rail steel structure awning column and significantly reducing the maintenance cost; 2. Carbon fiber is incorporated into the conductive structural adhesive layer, and the CECC layer is compounded with carbon-based materials to improve conductivity, avoiding the problem that current cannot be passed through due to rust and corrosion of the high-speed rail steel structure awning column. At the same time, in cooperation with metal anchor bolts, the conductive structural adhesive layer, the CECC layer and the high-speed rail steel structure awning column can conduct electricity and act as the cathode role, improving the anti-corrosion ability; 3. The high-ductility cement-based material compounded with carbon-based materials includes gel materials, natural river sand, thickeners, water reducers, water, PVA fibers, carbon fibers and carbon nanotubes, ensuring that the CECC layer has good high ductility, thereby realizing the toughening and strengthening of the column, and at the same time ensuring good conductivity; 4. Traditional paint coatings need to be reapplied regularly to maintain their anti-corrosion effect, while the technical solution provided by the present invention only requires regular monitoring and maintenance, without the need for frequent reapplying. The impressed current cathodic protection technology adopted by the present invention can protect the entire metal structure, including the inside 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. 5. The present invention provides a corrosion protection solution with lower cost. Although the initial cost of the present invention is relatively high, in the long run, due to the reduced need for maintenance and reapplying, the overall cost is lower. The CECC layer can adapt to different environmental conditions, such as high temperature, low temperature, high humidity and other environments, while the performance of paint coatings may change significantly due to environmental conditions. The impressed current cathodic protection technology can evaluate the anti-corrosion status of the column of the high-speed rail steel structure canopy through potential measurement and other monitoring technologies, ensuring that the structure is always protected. In contrast, the condition monitoring of paint coatings is usually more difficult. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the application of the anti-corrosion and toughening system for the high-speed rail steel structure canopy column described in the present invention in the entire high-speed rail canopy platform; Figure 2 It is a schematic diagram of the inside of the anti-corrosion and toughening system for the high-speed rail steel structure canopy column described in the present invention; Figure 3 For Figure 2 the top view schematic diagram; Figure 4 It is a schematic diagram of the mesh electrode surrounding the post-inserted bars; In the figure: 1. Steel structure canopy column, 2. Anchor bolt, 3. CECC layer, 4. Mesh electrode, 5. Conductive structural adhesive layer, 6. Post-inserted bar, 7. Cathode connector, 8. Solar power supply device, 9. Wind power supply device, 10. DC power supply. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present application.

[0020] In the description of the invention, it is necessary to understand that the directions or positional relationships indicated by the terms "front", "rear", "up", "down", "left", "right", etc. 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.

[0021] In order to solve the problems in the background technology, such as Figures 1 - 3 As shown, this embodiment provides a high-speed railway steel structure canopy column anti-corrosion toughening system, which mainly includes a steel structure canopy column 1, a DC power supply 10, a mesh electrode 4 and other structures. A number of iron anchors 2 are welded on the column body of the steel structure canopy column 1. A 2-5 mm thick conductive structure adhesive layer 5 is coated on the surface of the steel structure canopy column 1, and the thickness of the conductive structure adhesive layer 5 does not exceed the length of the anchor 2 exposed on the surface of the steel structure canopy column 1, ensuring that the anchor 2 is exposed to the conductive structure adhesive layer 5, and a 20-40 mm thick CECC layer 3 is coated on the outside of the conductive structure adhesive layer 5. In this embodiment, the CECC layer is made of a high-ductility cement-based material (referred to as CECC) with a carbon-doped base, and a mesh electrode 4 is pre-embedded in the CECC layer 3, which surrounds the column foot of the steel structure canopy column 1 for a week, and a cathode connector 7 is connected to the top of the steel structure canopy column 1, and the cathode end of the DC power supply 10 is connected to the cathode connector 7 through a wire, and the anode end is connected to the mesh electrode 4 through a wire.

[0022] In this embodiment, for environmental protection, direct current generated by wind energy or solar energy can be used to electrically connect the direct current power supply to the solar power supply device 8 and the wind power supply device 9 .

[0023] 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, and 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, and 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.

[0024] 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: S10. First, perform surface treatment on the steel structure awning column 1. Remove the corrosion products, mill scale, and poorly adhered old paint film attachments on the metal surface of the steel structure awning column 1 through mechanical sandblasting, and grind it to Sa2.5 level. The surface roughness control range is Rz 50μm to 100μm; S20. Uniformly weld several anchor bolts 2 on the column body of the steel structure awning column 1. The spacing of the anchor bolts 2 is 100mm to 300mm, which is beneficial to enhancing the conductivity of the cathodic protection system of the current; S30. Brush the epoxy resin conductive structural adhesive incorporated with carbon fiber on the surface of the steel structure awning 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 bolt 2 exposed on the surface of the steel structure awning column 1. In this embodiment, the thickness of the conductive structural adhesive layer 5 is 2 - 5mm; In this embodiment, carbon fiber is uniformly incorporated into the epoxy resin conductive structural adhesive during the preparation process. Its production includes the following steps: S301. Prepare chopped carbon fiber, whose mass accounts for 0.5% of the mass of the epoxy resin colloid, and use ultrasonic dispersion treatment to fully disperse it; S302. Mix the epoxy resin component and the curing agent component evenly according to the mass ratio of 1:1, then add the carbon fiber that has been dispersed in step S301, and continue to stir evenly to complete the preparation of the epoxy resin conductive structural adhesive; S40. As Figure 4 shown, set multiple planted bars 6 on the ground distributed around the steel structure awning column 1. There is a spacing of 15mm to 20mm between the layout of the planted bars 6 and the column body of the steel structure awning column 1. When the planted bars 6 are fixed to the ground, set a mesh electrode 4 on the outer side of the planted bars 6. The mesh electrode 4 is made of copper material and has good conductivity, so that the mesh electrode 4 surrounds the column foot of the steel structure awning column 1; S50. After the conductive structural adhesive layer 5 starts to set, spray a high-ductility cement-based material with a carbon-based admixture on the outer surface of the conductive structural adhesive layer 5 to form a CECC layer 3. The coating thickness is 20mm to 40mm, so that the mesh electrode 4 and the planted bars 6 are both located in the CECC layer 3; In this embodiment, in order to endow the CECC layer 3 with high toughness while achieving good electrical conductivity, the high-ductility cementitious composite material with double carbon-based admixtures includes a gel material, natural river sand, thickener, water reducer, water, PVA fiber, carbon fiber and carbon nanotubes. Among them, the gel material includes cement, Class I fly ash and silica fume. The mass of cement is set as 1, the dosage of Class I fly ash is 1.7 times that of cement, the dosage of silica fume is 0.3 times that of cement, the dosage of natural river sand is 1.3 times that of cement, the dosage of thickener is 0.15% of the mass of cement, the water-binder ratio is 0.35, the dosage of water reducer is 0.5% of the dosage of cement, and the volume fraction of PVA fiber is 2%; according to the mass ratio of the gel material, the doping concentration of carbon nanotubes is 0.3%, and the doping concentration of carbon fiber is 0.1%; In this embodiment, the preparation process of the high-ductility cementitious composite material with double carbon-based admixtures includes the following steps: S501. Sequentially add cement, Class I fly ash, natural river sand, and the solid component of the thickener into a special mixer, and perform slow stirring for 2 min; S502. Prepare a carbon-based dispersion liquid from carbon nanotubes, carbon fibers, silica fume and water reducer; the preparation process of the carbon-based dispersion liquid is as follows: First, mix carbon nanotubes, carbon fibers and water reducer in water and perform ultrasonic treatment for 30 min; then add silica fume and perform ultrasonic stirring for 10 min.

[0025] In the special mixer of S501, add the uniformly mixed water and carbon-based dispersion liquid and perform slow stirring for 1 min, and then perform fast stirring for 2 min; by adding the pre-prepared carbon-based dispersion liquid, the distribution of carbon nanotubes and carbon fibers in the CECC can be fully dispersed, avoiding the agglomeration of carbon-based materials from affecting the electrical conductivity of the CECC and ensuring the uniformity of the electrical conductivity; S503. Finally, add PVA fiber and perform fast stirring for 6 min; manually turn over the mixture and then perform fast stirring for 1 min; S60. Prepare a DC power supply, install a cathode connector 7 at the top of the steel structure awning column 1, connect the negative terminal of the DC power supply to the cathode connector 7 through a wire, and connect the positive terminal of the DC power supply to the mesh electrode 4 through a wire to form a current cathodic protection system.

[0026] The anti-corrosion and toughening construction method for the high-speed rail steel structure canopy column provided in this embodiment can effectively improve the interfacial adhesion strength between the CECC layer 3 and the steel structure canopy column 1 through the epoxy resin conductive structural adhesive. At the same time, it cooperates with the anchor bolts 2 to improve the firmness between the CECC layer 3 and the steel structure canopy column 1 through coordinated operation. The CECC layer 3 further improves the strength of the steel structure canopy column 1 and makes up for the toughness of the flexural bearing capacity of the corroded high-speed rail steel structure canopy column. Carbon fiber is incorporated into the conductive structural adhesive layer 5, and the CECC layer 3 is compounded with carbon-based materials. At the same time, it cooperates with the metal anchor bolts 2 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 role. Through the impressed current cathodic protection system, the impressed current cathodic protection technology is implemented, effectively inhibiting the chemical corrosion galvanic cell reaction of the high-speed rail steel structure canopy column, ensuring that the potential of the high-speed rail steel structure canopy column is always lower than the surrounding environment, thereby preventing the corrosion phenomenon caused by electron loss. This method effectively improves the durability of the high-speed rail steel structure canopy column and significantly reduces the maintenance cost.

[0027] Traditional paint coatings need to be repainted regularly to maintain their anti-corrosion effect. In contrast, the technical solution provided in this embodiment only requires regular monitoring and maintenance and does not require frequent repainting. The impressed current cathodic protection technology adopted in this embodiment can protect the entire metal structure, including the inside 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 relatively high, in the long run, due to the reduced need for maintenance and repainting, the overall cost is lower. The CECC layer 3 can adapt to different environmental conditions, such as high temperature, low temperature, high humidity and other environments, while the performance of paint coatings may change significantly due to environmental conditions.

Claims

1. A construction method for anti-corrosion and toughness enhancement of high-speed rail steel structure canopy columns, characterized in that, It includes the following steps: S10. First, surface-treat the steel structure awning column (1). Remove the corrosion products, mill scale, and poorly adhered old paint film attachments on the metal surface of the steel structure awning column (1) by mechanical sandblasting. S20. Uniformly weld anchor studs (2) on the column body of the steel structure awning column (1). S30. Brush an epoxy resin conductive structural adhesive incorporated with carbon fiber on the surface of the steel structure awning 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 stud (2) exposed on the surface of the steel structure awning column (1). S40. Set multiple planted bars (6) distributed around the steel structure awning column (1) on the ground. Set a mesh electrode (4) on the outer side of the planted bar (6). The mesh electrode (4) surrounds the column foot of the steel structure awning column (1). S50. After the conductive structural adhesive layer (5) starts to set, spray a high-ductility cementitious material incorporated with carbon-based materials on the outer surface of the conductive structural adhesive layer (5) to form a CECC layer (3). S60. Prepare a DC power supply (10). Install a cathode connector (7) at the top of the steel structure awning column (1). Connect the negative terminal of the DC power supply to the cathode connector (7) through a wire, and connect the positive terminal of the DC power supply (10) to the mesh electrode (4) through a wire to form a current cathodic protection system.

2. The anti-corrosion and toughening construction method for the high-speed rail steel structure canopy column according to claim 1, characterized in that, Carbon fiber is uniformly incorporated into the epoxy resin conductive structural adhesive during its preparation process. Its production includes the following steps: S301. Prepare chopped carbon fiber, whose mass accounts for 0.5% of the mass of the epoxy resin colloid, and fully disperse it by ultrasonic dispersion treatment. S302. Mix the epoxy resin component and the curing agent component evenly according to a mass ratio of 1:1, then add the carbon fiber that has been dispersed in step S301, and continue to stir evenly to complete the preparation of the epoxy resin conductive structural adhesive.

3. The anti-corrosion and toughening construction method for the high-speed rail steel structure canopy column according to claim 1, characterized in that The high-ductility cementitious material incorporated with carbon-based materials includes a gel material, natural river sand, a thickening agent, a water-reducing agent, water, PVA fiber, carbon fiber, and carbon nanotubes. Among them, the gel material includes cement, grade I fly ash, and silica fume.

4. The anti-corrosion and toughening construction method for the high-speed rail steel structure canopy column according to claim 3, characterized in that, Set the mass of the cement as 1. The dosage of grade I fly ash is 1.7 times the mass of the cement, the dosage of silica fume is 0.3 times the mass of the cement, the dosage of natural river sand is 1.3 times the mass of the cement, the dosage of the thickening agent is 0.15% of the mass of the cement, the water-binder ratio is 0.35, the dosage of the water-reducing agent is 0.5% of the cement dosage, and the volume fraction of PVA fiber is 2%. According to the mass ratio of the gel material, the addition concentration of carbon nanotubes is 0.3%, and the addition concentration of carbon fiber is 0.1%.

5. The anti-corrosion and toughening construction method for the high-speed railway steel structure canopy column according to claim 4, characterized in that, The preparation process of the high-ductility cementitious material incorporated with carbon-based materials includes the following steps: S501. Add cement, grade I fly ash, natural river sand, and the solid components of the thickening agent into a special mixer in sequence and stir. S502. Prepare a carbon-based dispersion liquid from carbon nanotubes, carbon fiber, silica fume, and the water-reducing agent. Add the uniformly mixed water and the carbon-based dispersion liquid into the special mixer in step S501 and stir. S503. Finally, add PVA fiber and stir.

6. The anti-corrosion and toughening construction method for the high-speed rail steel structure canopy column according to claim 5, characterized in that, In step S502, the preparation process of the carbon-based dispersion liquid is as follows: First, take carbon nanotubes, carbon fiber, and the water-reducing agent, mix them in water, and perform ultrasonic treatment for 30 minutes. Add silica fume and stir ultrasonically for 10 min.

7. The anti-corrosion and toughening construction method for the high-speed rail steel structure canopy column according to claim 1, characterized in that In step S10, remove the corrosion products, mill scale and poorly adhered old paint film attachments on the metal surface of the steel structure awning column (1) by mechanical sandblasting; grind to Sa2.5 level, with a surface roughness of Rz 50 μm - 100 μm; In step S20, the spacing of the anchor bolts (2) is 100 mm to 300 mm.

8. The anti-corrosion and toughening construction method for the high-speed railway steel structure canopy column according to claim 1, 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.

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

10. A corrosion-resistant and toughness-increasing system for high-speed railway steel structure canopy columns, characterized in that, Manufactured by using the anti-corrosion and toughening construction method for the high-speed rail steel structure awning column described in claim 1, including a steel structure awning column (1) and a DC power supply, and a plurality of anchor bolts (2) are provided on the column body of the steel structure awning column (1); A conductive structural adhesive layer (5) is provided on the surface of the steel structure awning column (1), the thickness of the conductive structural adhesive layer (5) does not exceed the length of the anchor bolt (2) exposed on the surface of the steel structure awning column (1), and a CECC layer (3) is provided outside the conductive structural adhesive layer (5); A mesh electrode (4) is embedded in the CECC layer (3), the mesh electrode (4) surrounds the column foot of the steel structure awning column (1) for one week, a cathode connector (7) is provided at the top of the steel structure awning column (1), the negative terminal of the DC power supply is connected to the cathode connector (7) through a wire, and the positive terminal is connected to the mesh electrode (4) through a wire.

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