A method for preventing rust and breakage at the connection between bridge iron railings and concrete using magnetic grout.

Abstract

This invention provides a method for preventing rust breakage at the connection between bridge iron railings and concrete using a magnetic grout. The method includes repairing rusted iron railings with the magnetic grout and pre-treating newly manufactured iron railings with magnetization to prevent corrosion. After the magnetic grout is applied to the iron railing, it is covered with a specially designed non-magnetic material tube, which is sealed with water-swellable rubber. The magnetic grout achieves its coating effect by magnetizing the iron railing or using an electromagnet. This invention can repair and prevent rust on easily corroded structures, including but not limited to bridge iron railings, both above and below water, and has broad engineering practical significance and application prospects.

Description

Technical Field

[0001] This invention belongs to the field of anti-corrosion technology for engineering metal components, and in particular relates to a method for preventing the rust and breakage of the connection between the iron railing and the concrete of a bridge using a magnetic grout. Background Technology

[0002] With the rapid development of society and economy, a large number of iron railings are used in bridge construction. How to prevent the iron railings from rusting and breaking at the connection between the iron railings and concrete has been one of the important topics that researchers have long been concerned with.

[0003] The main reason for the rusting and breakage of iron railings is that during the connection process between the iron railing and the concrete, water in the concrete, as well as rainwater and corrosive liquids, damage the surface of the iron railing. Therefore, how to prevent the iron railing from rusting and breaking at the connection point between the iron railing and the concrete is one of the topics that researchers have been paying close attention to for a long time. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a method for preventing rust and breakage at the connection between bridge iron railings and concrete using magnetic grout. By encapsulating the connection between the iron railing and concrete with magnetic grout, the method isolates the iron railing from air, preventing the penetration of rainwater and corrosive liquids. This fundamentally solves the problem of rust and breakage at the connection between iron railings and concrete, which is unsolvable by traditional construction methods. It significantly reduces the probability of rust and breakage at the connection between bridge iron railings and concrete, increases the service life of bridges, reduces the frequency of maintenance and repairs, saves building material consumption, and greatly prevents safety accidents. It has broad engineering practical significance and application prospects.

[0005] To achieve the above-mentioned technical features, the present invention aims to provide a method for preventing rust and breakage at the connection between bridge iron railings and concrete using magnetic grout. This method involves mixing nano-magnetic powder and ultrafine cement mortar to create a magnetic grout, which is then adsorbed onto the connection between the magnetized iron railing and the concrete portion, forming an insulating layer. Finally, a non-magnetic cylindrical tube is used to cover the connection, and the gaps are sealed with cement, thereby protecting the iron railing and preventing corrosion.

[0006] The non-magnetic cylindrical flower tube has anti-oxidation and corrosion-resistant properties, forming a good insulating layer to protect the magnetic slurry from falling off or being damaged.

[0007] The joints of the non-magnetic cylindrical flower tube are filled with water-swellable rubber. The water-swellable rubber expands and deforms 2-3 times when it comes into contact with water, filling all irregular surfaces, cavities and gaps in the joint, while generating huge contact pressure to completely prevent leakage.

[0008] The iron railings are magnetized at the factory using a magnetizer, which makes them magnetic and facilitates the adsorption of magnetic slurry onto them.

[0009] When repairing rusted iron railings, multiple turns of coil are wound around the rusted iron railings, and an adjustable current power supply is connected. The current intensity is adjusted to form an electromagnet, which facilitates the attraction of magnetic slurry for repair. The current is adjusted by using an adjustable power supply, which changes the magnetic field of the electromagnet, thus vibrating the magnetic slurry and making it adhere more tightly to the iron railing. The electric current generated by the electromagnet is used to expel air bubbles from the magnetic slurry, thereby increasing the sealing performance.

[0010] An electromagnet consisting of an iron core, a multi-turn coil, and an adjustable current power supply is placed inside an iron railing to attract magnetic slurry. When an iron core cannot be inserted into an iron railing, a multi-turn coil is wound around the iron railing and energized to form an electromagnet to attract magnetic slurry.

[0011] Small, disc-shaped permanent magnets are used to enhance the attraction to the magnetic slurry and prevent the magnetic slurry from falling off.

[0012] During the repair process, permanent magnets are used to accumulate magnetic slurry through electromagnetic oscillation to form a solid column, thereby achieving a better repair effect on rust.

[0013] Magnetic grout was injected both inside and outside the iron railings to prevent them from rusting and breaking from the inside.

[0014] A method for preventing rust and breakage at the connection between iron railings and concrete of bridges using magnetic grout includes the following specific steps: Newly manufactured iron railings undergo processing to prevent rust: Step 1: Use a magnetizer to magnetize the newly manufactured iron railings to make them magnetic, which facilitates the adhesion of magnetic slurry. Step 2: During construction, slowly pour the magnetic grout into the connection between the iron railing and the concrete part, and use a vibrator to vibrate it so that the magnetic grout is fully coated on the iron railing. Step 3.1: Divide the non-magnetic cylindrical flower tube into two semicircles and cut them to the length that matches the iron railing at the connection point with the concrete part; Step 3.2: While the magnetic slurry is still wet, join the two semi-circular non-magnetic cylindrical flower tubes together on the iron railing; Step 3.3: Apply water-swellable rubber to the gap between the two semi-circular non-magnetic cylindrical flower tubes, and wait for it to fully contact the moisture in the air to expand and fill the gap, thereby strengthening the sealing effect and preventing corrosive liquids from seeping in. Step 4.1: Place the appropriately sized non-magnetic cylindrical flower tube inside the iron railing; Step 4.2: Slowly inject the magnetic grout into the interlayer between the iron railing and the non-magnetic cylindrical flower tube, and use a vibrator to apply it to the connection with the concrete part; Step 4.3: Apply water-swellable rubber to the inside of the iron railing and the junction with the non-magnetic cylindrical flower tube to seal it and prevent corrosive liquids from seeping in; Step 5: Place the small disc-shaped permanent magnet inside the iron railing and seal it with water-swellable rubber to enhance the attraction to the magnetic slurry. Using an electromagnet to repair rusted iron railings: Step 1: Wind a multi-turn coil around an iron core and connect an adjustable power supply to form an electromagnet; Step 2: Place the electromagnet inside the hollow iron railing that has already rusted. If the electromagnet cannot be placed inside the iron railing, simply wind multiple turns of coil around the iron railing and energize it to form an electromagnet. Step 3.1: Slowly pour the magnetic grout into the connection between the iron railing and the concrete part, and adjust the current to attract the magnetic grout to more completely coat the connection between the iron railing and the concrete part. Step 3.2: Place the permanent magnet on both sides of the iron railing, and vibrate the permanent magnet and the iron core up and down to make the magnetic slurry accumulate and form a solid column, which can better repair the rust. Step 4.1: Divide the non-magnetic cylindrical flower tube into two semicircles and cut them to the length that matches the iron railing at the connection point with the concrete part. Step 4.2: While the magnetic slurry is still wet, join the two semi-circular non-magnetic cylindrical flower tubes together on the iron railing; Step 4.3: Apply water-swellable rubber to the gap between the two semi-circular non-magnetic cylindrical flower tubes, and wait for it to fully contact the moisture in the air to expand and fill the gap, thereby strengthening the sealing effect and preventing corrosive liquids from seeping in. Step 5.1: Remove the electromagnet. If the multi-turn coil is directly wound on the iron railing, remove it. Step 5.2: Place the appropriately sized non-magnetic cylindrical flower tube inside the iron railing; Step 5.3: Slowly inject the magnetic grout into the interlayer between the iron railing and the non-magnetic cylindrical flower tube. Use an electromagnet to attract the magnetic grout from the outside, so that it is evenly adhered to the connection between the iron railing and the concrete part. Step 5.4: Apply water-swellable rubber to the inside of the iron railing and the junction with the non-magnetic cylindrical flower tube to seal it and prevent corrosive liquids from seeping in. Step 6: Place a small disc-shaped permanent magnet inside the iron railing and seal it with water-swellable rubber to enhance the attraction to the magnetic slurry.

[0015] The present invention has the following beneficial effects: 1. This invention innovatively uses a mixture of nano-magnetic powder and ultrafine cement to tightly bond with iron railings. Because the mixture uses ultrafine cement and nano-magnetic powder, it can penetrate into the tiny pores at the joint, making the bond between the slurry and the iron railings tighter. This also more easily and effectively prevents the iron railings from contacting the air and blocks the penetration of corrosive liquids such as rainwater.

[0016] 2. The non-magnetic cylindrical perforated pipe used in this invention is non-magnetic, corrosion-resistant, and oxidation-resistant, which blocks the penetration of corrosive liquids such as rainwater and prevents the magnetic grout from falling off accidentally, reducing the amount of magnetic grout required, saving costs, and reducing construction time.

[0017] 3. This invention uses a mixture of ultrafine concrete mortar and nano magnetic powder. The magnetic slurry has the characteristics of self-aggregation, not easy dispersion in water and attraction by magnetic force, so it can maximize the discharge of gas during construction.

[0018] 4. By analyzing the on-site working conditions, this invention can adjust the ratio of ultrafine cement to nano magnetic powder, which greatly saves costs. Furthermore, by changing the ratio of the two materials, it can better adapt to external factors such as weather changes during construction.

[0019] 5. This invention controls the timing of the magnetic grout mixture injection. By adsorbing the magnetic grout well and installing the non-magnetic cylindrical pipe promptly before it solidifies, the mixture of ultrafine cement and nano-magnetic powder is prevented from detaching, thus ensuring a tighter bond between the iron railing and the magnetic grout.

[0020] 6. This invention affects the magnetic field by changing the magnitude of the current, causing magnetic field vibration within the magnetic field range. This makes the iron railing bond with the mixed slurry more tightly, thereby avoiding the use of mechanical vibration and making it safer and more reliable.

[0021] 7. This invention uses the electric current heating effect of an electromagnet to heat the magnetic mixing slurry, which can better expel gas from the mixing slurry and further increase the sealing performance. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 Iron railings awaiting repair.

[0024] Figure 2 Newly manufactured iron railings.

[0025] Figure 3 Iron railings after electromagnetism is formed.

[0026] Figure 4 Partially magnetized iron railings.

[0027] Figure 5 Schematic diagram of magnetic slurry mixing.

[0028] Figure 6 Schematic diagram of vibrating magnetic mixing slurry.

[0029] Figure 7 A schematic diagram of the cross-section of the iron railing after it is wrapped with a floral tube.

[0030] Figure 8 Diagram of a flower tube seal.

[0031] Figure 9 A schematic diagram of magnetizing an electromagnet in an iron railing.

[0032] Figure 10 A schematic diagram of magnetic slurry being injected into the inside of an iron railing.

[0033] Figure 11 A schematic diagram showing a small disc-shaped permanent magnet placed inside an iron railing.

[0034] Figure 12 Diagram of underwater operations.

[0035] In the diagram: 1. Magnetic slurry, 2. Water-swellable rubber, 3. Magnetizer, 4. Iron railing, 5. Non-magnetic cylindrical flower tube, 6. Vibrator, 7. Iron core, 8. Multi-turn coil, 9. Adjustable current power supply, 10. Small disc-shaped permanent magnet, 11. Permanent magnet, 12. Concrete part, 13. Magnetized part. Detailed Implementation

[0036] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0037] Example 1: See Figure 1-12A method for preventing rust and breakage at the connection between bridge iron railings and concrete using magnetic grout is disclosed. This method involves mixing nano-magnetic powder and ultrafine cement mortar to create a magnetic grout 1, which is then adsorbed onto the connection between the magnetized iron railing 4 and the concrete portion 12, forming an insulating layer. Finally, a non-magnetic cylindrical tube 5 is used to cover the connection, and the gaps are sealed with cement, thus protecting the iron railing 4 and preventing corrosion. By wrapping the connection between the iron railing and concrete with magnetic grout, the contact between the iron railing and air is isolated, preventing the penetration of rainwater and corrosive liquids. This fundamentally solves the problem of rust and breakage at the connection between iron railings and concrete, which is unsolvable by traditional construction methods. It significantly reduces the probability of rust and breakage at the connection between bridge iron railings and concrete, increases the service life of bridges, reduces the frequency of inspections and renovations, saves building material consumption, and greatly prevents safety accidents. This method has broad engineering practical significance and application prospects.

[0038] Furthermore, the non-magnetic cylindrical flower tube 5 has anti-oxidation and corrosion-resistant properties, forming a good insulating layer to protect the magnetic slurry 1 from falling off or being damaged.

[0039] Furthermore, the joints of the non-magnetic cylindrical flower tube 5 are filled with water-swellable rubber 2. The water-swellable rubber 2 expands and deforms 2-3 times after contact with water, filling all irregular surfaces, cavities and gaps of the joint, while generating huge contact pressure to completely prevent leakage.

[0040] Furthermore, the iron railing 4 is magnetized by a magnetizer when it leaves the factory, so that the newly manufactured iron railing 4 has magnetism, which makes it easier for magnetic slurry to be adsorbed onto it.

[0041] Furthermore, when repairing the rusted iron railing 4, a multi-turn coil 8 is wound around the rusted iron railing 4, and an adjustable current power supply 9 is connected. The current intensity is adjusted to form an electromagnet, which facilitates the adsorption of magnetic slurry 1 for repair.

[0042] Furthermore, the current is adjusted by using an adjustable power supply 9 to change the magnetic field of the electromagnet, which vibrates the magnetic slurry 1, making the magnetic slurry 1 adhere more tightly to the iron railing 4.

[0043] Furthermore, the electric current generated by the electromagnet is used to expel air bubbles from the magnetic slurry 1, thereby increasing the sealing performance.

[0044] Furthermore, an electromagnet consisting of an iron core 7, a multi-turn coil 8, and an adjustable current power supply 9 is placed inside the iron railing 4 to attract magnetic slurry 1.

[0045] Furthermore, when the iron core 7 cannot be inserted into the iron railing 4, a multi-turn coil 8 is simply wound around the iron railing 4 and energized to form an electromagnet to attract the magnetic slurry 1.

[0046] Furthermore, a small disc-shaped permanent magnet 10 is used to enhance the attraction to the magnetic slurry 1 and prevent the magnetic slurry 1 from falling off.

[0047] Furthermore, during the repair process, permanent magnets 11 are used to accumulate magnetic slurry 1 through electromagnetic oscillation to form a solid column, thereby achieving a better rust repair effect.

[0048] Furthermore, magnetic grout 1 is injected both inside and outside the iron railing 4 to prevent it from rusting and breaking from the inside.

[0049] Example 2: A method for preventing rust and breakage at the connection between iron railings and concrete of bridges using magnetic grout includes the following specific steps: Newly manufactured iron railings undergo processing to prevent rust: Step 1: Use a magnetizer to magnetize the newly manufactured iron railing 4 to make it magnetic, which facilitates the adhesion of magnetic slurry 1. Step 2: During construction, slowly pour the magnetic grout 1 into the connection between the iron railing 4 and the concrete part 12, and use the vibrator 6 to vibrate it so that the magnetic grout 1 is fully wrapped on the iron railing 4. Step 3.1: Divide the non-magnetic cylindrical flower tube 5 into two semicircles and cut them to the length that matches the iron railing 4 at the connection point with the concrete part 12. Step 3.2: While the magnetic slurry 1 is still wet, join the two semi-circular non-magnetic cylindrical flower tubes 5 together on the iron railing 4; Step 3.3: Apply water-swellable rubber 2 to the gap between the two semi-circular non-magnetic cylindrical flower tubes 5, and wait for it to fully contact the moisture in the air to expand and fill the gap, thereby strengthening the sealing effect and preventing corrosive liquids from seeping in. Step 4.1: Place the non-magnetic cylindrical flower tube 5 of appropriate size inside the iron railing 4; Step 4.2: Slowly inject the magnetic grout 1 into the interlayer between the iron railing 4 and the non-magnetic cylindrical flower tube 5, and use a vibrator 6 to apply it to the connection with the concrete part 12. Step 4.3: Apply water-swellable rubber 2 to the inside of the iron railing 4 and the junction with the non-magnetic cylindrical flower tube 5 to seal it and prevent corrosive liquid from seeping in. Step 5: Place the small disc-shaped permanent magnet 10 inside the iron railing 4 and seal it with water-swellable rubber 2 to enhance the attraction to the magnetic slurry 1. Example 3: Using an electromagnet to repair rusted iron railings: Step 1: Wind the multi-turn coil 8 around the iron core 7 and connect the current adjustable power supply 9 to form an electromagnet; Step 2: Place the electromagnet inside the hollow iron railing 4 that has already rusted. If the electromagnet cannot be placed inside the iron railing, directly wind the multi-turn coil 8 around the iron railing 4 and energize it to form an electromagnet. Step 3.1: Slowly pour magnetic grout 1 into the connection between the iron railing 4 and the concrete part, and adjust the current to attract the magnetic grout 1 to more completely wrap the connection between the iron railing 4 and the concrete part. Step 3.2: Place the permanent magnet 11 on both sides of the iron railing 4. Vibrate the permanent magnet 11 and the iron core 7 up and down to make the magnetic slurry 1 accumulate and form a solid column, which can better repair the rust. Step 4.1: Divide the non-magnetic cylindrical flower tube 5 into two semicircles and cut them to the length that matches the iron railing at the connection point with the concrete part. Step 4.2: While the magnetic slurry 1 is still wet, join the two semi-circular non-magnetic cylindrical flower tubes 5 together on the iron railing 4; Step 4.3: Apply water-swellable rubber 2 to the gap between the two semi-circular non-magnetic cylindrical flower tubes 5, and wait for it to fully contact the moisture in the air to expand and fill the gap, thereby strengthening the sealing effect and preventing corrosive liquids from seeping in. Step 5.1: Remove the electromagnet. If the multi-turn coil 8 is directly wound around the iron railing 4, remove it. Step 5.2: Place the non-magnetic cylindrical flower tube 5 of appropriate size inside the iron railing 4; Step 5.3: Slowly inject the magnetic grout 1 into the interlayer between the iron railing 4 and the non-magnetic cylindrical flower tube 5. Use an electromagnet to attract the magnetic grout 1 from the outside, so that it is evenly attached to the connection between the iron railing 4 and the concrete part. Step 5.4: Apply water-swellable rubber 2 to the inside of the iron railing 4 and the junction with the non-magnetic cylindrical flower tube 5 to seal it and prevent corrosive liquid from seeping in. Step 6: Place the small disc-shaped permanent magnet 10 inside the iron railing 4 and seal it with water-swellable rubber 2 to enhance the attraction to the magnetic slurry 1.

Claims

1. A method for preventing rust and breakage at the connection between hollow iron railings and concrete in bridges using magnetic grout, characterized in that, This includes the following steps for preventing rust on newly manufactured hollow iron railings: S1. A magnetizer is used to magnetize the newly manufactured hollow iron railing (4) so ​​that the hollow iron railing (4) becomes magnetic. S2. Mix nano magnetic powder and ultrafine cement mortar to make magnetic slurry (1). During construction, slowly pour the magnetic slurry (1) into the connection between the hollow iron railing (4) and the concrete part (12), and use a vibrator (6) to vibrate it so that the magnetic slurry (1) wraps around the hollow iron railing (4). S3. Divide the non-magnetic cylindrical flower tube (5) into two semi-circular parts and cut them to the length that matches the hollow iron railing (4) at the connection point of the concrete part (12). While the magnetic grout (1) is still wet, join the two semi-circular non-magnetic cylindrical flower tubes (5) together on the hollow iron railing (4) to form a protective layer on the outside of the connection point. S4. Apply water-swellable rubber (2) to the gap between the two semi-circular non-magnetic cylindrical flower tubes (5). After it comes into contact with the moisture in the air, it expands and fills the gap. Then, use cement to close the gap to prevent corrosive liquid from seeping in. S5. Place a non-magnetic cylindrical flower tube (5) of appropriate size into the hollow iron railing (4), slowly inject the magnetic grout (1) into the interlayer between the hollow iron railing (4) and the non-magnetic cylindrical flower tube (5) located inside it, and use a vibrating rod (6) to apply the magnetic grout (1) to the connection between the hollow iron railing (4) and the concrete part (12). S6. Apply water-swellable rubber (2) to the junction of the hollow iron railing (4) and the non-magnetic cylindrical flower tube (5) located inside it to seal it and prevent corrosive liquid from seeping in. S7. Place the small disc-shaped permanent magnet (10) inside the hollow iron railing (4) and seal it with water-swellable rubber (2) to enhance the attraction of the magnetic slurry (1).

2. The method for preventing rust breakage at the connection between hollow iron railings and concrete in bridges using magnetic grout according to claim 1, characterized in that: The non-magnetic cylindrical flower tube (5) has antioxidant and corrosion-resistant properties, and is used to protect the magnetic slurry (1) from falling off or being damaged.

3. The method for preventing rust and breakage at the connection between hollow iron railings and concrete in bridges using magnetic grout according to claim 1, characterized in that: The water-swellable rubber (2) expands and deforms 2-3 times when it comes into contact with water, filling the irregular surface, cavities and gaps of the joint, and generating contact pressure to prevent leakage.

4. The method for preventing rust breakage at the connection between hollow iron railings and concrete in bridges using magnetic grout according to claim 1, characterized in that: The magnetic slurry (1) has the characteristics of self-aggregation, not being easily dispersed in water and being attracted by magnetic force, so that the magnetic slurry (1) enters the small pores at the connection and is adsorbed onto the surface of the hollow iron railing (4).

5. The method for preventing rust and breakage at the connection between hollow iron railings and concrete in bridges using magnetic grout according to claim 1, characterized in that, It also includes the following steps for repairing hollow iron railings (4) that have already rusted: S51. Wrap a multi-turn coil (8) around an iron core (7) and connect an adjustable current power supply (9) to form an electromagnet. Place the electromagnet inside a hollow iron railing (4) that has been corroded. S52. Slowly pour the magnetic slurry (1) into the connection between the hollow iron railing (4) and the concrete part, and adjust the current of the adjustable power supply (9) to attract the magnetic slurry (1) to wrap around the connection. S53. While the magnetic slurry (1) is still wet, put the two semi-circular non-magnetic cylindrical flower tubes (5) together on the hollow iron railing (4), and apply water-swellable rubber (2) to the gap between the two semi-circular non-magnetic cylindrical flower tubes (5) to seal them. S54. Take out the electromagnet, put a non-magnetic cylindrical flower tube (5) of appropriate size into the hollow iron railing (4), slowly inject the magnetic slurry (1) into the interlayer between the hollow iron railing (4) and the non-magnetic cylindrical flower tube (5) located inside it, and use the electromagnet to attract the magnetic slurry (1) from the outside, so that it adheres to the connection between the hollow iron railing (4) and the concrete part, and then apply water-swellable rubber (2) to the junction between the hollow iron railing (4) and the non-magnetic cylindrical flower tube (5) located inside it to seal it.

6. The method for preventing rust breakage at the connection between hollow iron railings and concrete in bridges using magnetic grout according to claim 5, characterized in that: When the electromagnet cannot be inserted into the hollow iron railing (4), a multi-turn coil (8) is wound around the hollow iron railing (4) and energized to form an electromagnet to attract the magnetic slurry (1).

7. The method for preventing rust breakage at the connection between hollow iron railings and concrete in bridges using magnetic grout according to claim 5, characterized in that: The current is adjusted by the adjustable power supply (9) to change the magnetic field of the electromagnet, which vibrates the magnetic slurry (1) and makes the magnetic slurry (1) adhere to the hollow iron railing (4). The current heat effect generated by the electromagnet is used to expel the air bubbles in the magnetic slurry (1) to increase the sealing.

8. The method for preventing rust breakage at the connection between hollow iron railings and concrete in bridges using magnetic grout according to claim 5, characterized in that: During the repair, the permanent magnet (11) is placed on both sides of the hollow iron railing (4), and the permanent magnet (11) and the iron core (7) are vibrated up and down to make the magnetic slurry (1) accumulate to form a solid column.

Images