A maintainable embedded sacrificial anode for protection of steel reinforcement from corrosion in concrete

Abstract

The utility model discloses a kind of maintainable embedded sacrificial anode for concrete steel bar corrosion protection, belong to steel bar repair protection technical field.The utility model's maintainable embedded sacrificial anode for concrete steel bar corrosion protection includes: sacrificial metal;And protective shell, it is wrapped in the outside of sacrificial metal, and its outside sealing, inside is porous intercommunication structure.The utility model carries out optimization design to the structure of protective shell, its outside sealing, inside is porous intercommunication structure, to be able to store on the basis of guaranteeing the protection effect of sacrificial metal to protective gel, and can meet the requirement of long-term working humidity, acid-base degree and ion distribution etc. working environment of sacrificial metal, so as to improve the working life of sacrificial anode.

Description

Technical Field

[0001] This utility model belongs to the field of steel bar repair and protection technology, and more specifically, relates to a maintainable embedded sacrificial anode for protecting concrete steel bar from corrosion. Background Technology

[0002] Currently, my country's construction industry has gradually shifted from a phase of large-scale new building construction to a phase where maintenance, with a focus on urban operation and maintenance, outweighs new construction. In the field of reinforced concrete construction, steel corrosion is considered the primary cause affecting the durability of concrete structures and one of the major defects in concrete engineering durability. Steel corrosion in concrete is a major global concern. Steel corrosion has already caused, or is causing, significant economic losses to the national economy; therefore, preventing steel corrosion is crucial for improving concrete durability.

[0003] The sacrificial anode method for reinforced concrete utilizes a metal or alloy with a potential more negative than that of the reinforcing steel within the concrete, connected to the steel being protected. The method relies on the current generated by the continuous corrosion and dissolution of the steel by the more negatively charged metal to protect the reinforcing steel. Traditional embedded discrete sacrificial anode protective shells typically use ordinary mortar or porous mortar with strength lower than the solid concrete, completely encapsulating the anode within the concrete during construction. While this method ensures the sacrificial anode is not damaged during construction, it cannot meet the requirements for long-term operation in acidic / alkaline environments, humidity levels, and ion distribution conditions, resulting in a relatively short lifespan for the sacrificial anode and thus affecting the safety of the building. Utility Model Content

[0004] The purpose of this invention is to provide a maintainable embedded sacrificial anode for the protection of concrete steel reinforcement corrosion, thereby effectively solving the problem that existing embedded sacrificial anodes cannot meet the requirements of sacrificial metals for long-term working environment such as acidity, alkalinity, and humidity.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows: This utility model provides a maintainable embedded sacrificial anode for protecting concrete reinforcing steel from corrosion, comprising: Sacrificial metal; A protective outer shell, enclosing the sacrificial metal, includes a first dense outer layer and a first water-permeable inner layer located inside the first dense outer layer, the first water-permeable inner layer having interconnected channels; and A maintenance passage is located in the first dense outer layer and is used to connect the first permeable inner layer with the outside of the poured concrete.

[0006] To address the problem that existing sacrificial anodes for concrete reinforcement corrosion protection are typically directly enclosed within the concrete, failing to effectively meet the long-term environmental requirements for humidity, pH, and ion distribution, this invention provides a maintainable embedded sacrificial anode. By designing the protective shell as a structure consisting of a dense outer layer (impermeable) and a permeable inner layer, with maintenance channels connecting the permeable inner layer to the outside of the poured concrete, the protective shell effectively protects the sacrificial metal while simultaneously allowing the perforated structure of the first permeable inner layer to store maintenance gel. This ensures the internal moisture, ion concentration, and conditions necessary for metal corrosion, significantly extending the service life of the sacrificial anode. Furthermore, the maintenance channels facilitate the injection of maintenance gel into the protective shell and enable non-destructive testing of the sacrificial anode.

[0007] Furthermore, the maintenance channel includes a second solid outer layer and a second water-permeable inner layer located inside the second solid outer layer. The second water-permeable inner layer is also provided with interconnected channels. The maintenance channel penetrates the first solid outer layer and is connected to the first water-permeable inner layer through the channels of the second water-permeable inner layer. The maintenance channel can be directly integrally formed with the protective shell or can be formed in stages.

[0008] Furthermore, the pores in both the first and second permeable inner layers are distributed in a honeycomb structure. However, it should be noted that there are no strict limitations on the shape of the pores in the first and second permeable inner layers in this application, as long as the pores can be interconnected to ensure the storage and flow of the maintenance gel and the like within the pores.

[0009] Furthermore, the maintenance channel is located on one side of the back steel reinforcement of the protective shell.

[0010] Furthermore, the number of maintenance channels is at least one, and its length is 3-6 cm.

[0011] Furthermore, the strength of the first dense outer layer of the protective shell is not less than 10 MPa to ensure its protective effect on the sacrificial metal.

[0012] Furthermore, the first dense outer layer and the first permeable inner layer are formed by layered mortar pouring, wherein the inner layer is poured to form interconnected channels (i.e., porous mortar), and the outer layer is poured to form a sealed structure. Specifically, the structure of the pouring layers can be controlled by the design of the pouring mold.

[0013] Furthermore, the first dense outer layer and the first permeable inner layer are made of ceramic. The first dense outer layer is sintered to form a dense structure, and the first permeable inner layer is sintered to form interconnected channels (for example, by adding a pore-forming agent), that is, porous ceramic is used.

[0014] Furthermore, the sacrificial metal is connected with a connecting contact angle, which protrudes from the inner side of the protective shell near the reinforcing bar, for electrically connecting the sacrificial metal and the reinforcing bar.

[0015] In existing technologies, sacrificial metals are typically electrically connected to reinforcing bars using wires. This application, however, directly integrally molds connecting contact angles onto the sacrificial metal, exposing these contact angles outside the protective casing. This allows for a conductive connection between the sacrificial metal and the reinforcing bar through the connecting contact angles. Therefore, on the one hand, the connection between the connecting contact angles and the sacrificial metal is firm, preventing the wire connection points from loosening; on the other hand, the conductive connection between the connecting contact angles and the reinforcing bar is convenient, helping to prevent poor conductivity and solving the problem of inconvenient wire-reinforcing bar binding operations.

[0016] Furthermore, the inner side of the protective shell near the reinforcing bar is processed into an arc-shaped structure that matches the outer diameter of the reinforcing bar, which helps to increase the protective shell's coverage of the reinforcing bar and the firmness of the connection with the reinforcing bar.

[0017] In summary, the technical solution provided by this utility model, compared with the prior art, can achieve the following beneficial effects: (1) The present invention optimizes the structure of the protective shell, which is sealed on the outside and has a connected channel inside, so as to store the protective gel while ensuring the protection of the sacrificial metal, and can meet the requirements of the sacrificial metal for long-term working environment such as humidity, acidity and alkalinity and ion distribution, thus improving the working life of the sacrificial anode.

[0018] (2) The present invention also provides a maintenance channel, which is used to connect the inside of the protective shell with the outside of the poured concrete. The setting of the maintenance channel facilitates the injection of maintenance gel into the inside of the protective shell through the maintenance channel, and also facilitates non-destructive testing of the sacrificial anode.

[0019] (3) The present invention processes the inner side of the protective shell close to the reinforcing bar into an arc-shaped structure that matches the outer diameter of the reinforcing bar, thereby increasing the relative area between the sacrificial anode and the reinforcing bar as well as the contact area with the concrete, thereby improving the protection effect on the reinforcing bar and more effectively ensuring the migration of ions in the concrete. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the maintainable embedded sacrificial anode for protecting concrete steel reinforcement from corrosion in this embodiment of the present invention. Figure 2 This is a cross-sectional schematic diagram of the maintainable embedded sacrificial anode in an embodiment of the present utility model; Figure 3This is a cross-sectional schematic diagram of the first permeable inner layer in an embodiment of this utility model; Figure 4 This is a schematic diagram of the pore distribution of the first permeable inner layer in an embodiment of this utility model.

[0021] Label Explanation: 1. Protective outer shell; 101. First dense outer layer; 102. First permeable inner layer; 103. Channel; 2. Maintenance channel; 201. Second dense outer layer; 202. Second permeable inner layer; 3. Connecting contact angle; 4. Sacrificial anode. Detailed Implementation

[0022] To further understand the content of this utility model, it will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] like Figure 1 , Figure 2 As shown, this utility model embodiment provides a maintainable embedded sacrificial anode for concrete reinforcement corrosion protection, including a sacrificial metal 4 and a protective shell 1. The protective shell 1 is wrapped around the sacrificial metal 4 and includes a first dense outer layer 101 and a first permeable inner layer 102 located inside the first dense outer layer 101. The first permeable inner layer 102 is provided with at least partially interconnected channels 103. The first dense outer layer 101 is provided with a maintenance channel 2, which penetrates the first dense outer layer 101 and connects the outside of the poured concrete to the first permeable inner layer 102.

[0024] In existing technologies, the sacrificial metal of a sacrificial anode is typically directly enclosed within the protective shell and then integrally cast and embedded in concrete. Therefore, after a certain period of operation, the sacrificial anode cannot meet the long-term requirements of the sacrificial metal regarding pH, humidity, and ion distribution, resulting in a relatively short service life and impacting the building's lifespan and operational safety. This invention addresses this by designing the protective shell 1 as an externally sealed structure with internally connected channels. This allows the protective shell's sealed outer layer to prevent the internal maintenance gel from leaking out while meeting the shell's strength requirements. Simultaneously, the interconnected channel structure of the first permeable inner layer 102 stores the maintenance gel and maintains the necessary moisture, ion concentration, and metal corrosion conditions, effectively extending the sacrificial anode's service life.

[0025] Furthermore, the first dense outer layer 101 is also provided with a maintenance channel 2, which runs through the first dense outer layer 101 and connects the outside of the poured concrete with the first permeable inner layer 102. This allows maintenance gel (preferably a fluid substance such as petroleum jelly, and other substances that maintain the reaction conditions of the sacrificial metal can also be added) to be delivered into the protective shell 1 to maintain the sacrificial anode. At the same time, it also facilitates non-destructive testing of the sacrificial anode to ensure its normal operation.

[0026] In some embodiments, the maintenance channel 2 includes a second dense outer layer 201 and a second permeable inner layer 202 located inside the second dense outer layer 201. The second permeable inner layer 202 also has interconnected channels through which maintenance gel and the like can be transported to the first permeable inner layer 102. When maintenance of the sacrificial anode is required, a vacuum extraction and vacuum injection method can be used. That is, the waste gel is first vacuum extracted through the maintenance channel 2, and then new maintenance gel is vacuum injected, thereby replacing the maintenance gel inside the sacrificial anode, which helps to ensure the normal operation of the sacrificial anode. Specifically, the maintenance equipment in the patent application number 2024214139733 can be used for the maintenance of the sacrificial anode.

[0027] The maintenance channel 2 can be integrally formed with the protective shell 1, or it can be formed in stages. Because the maintenance channel is relatively narrow, in addition to the damage caused by concrete falling and vibration during concrete pouring, the force of vacuum replacement of the maintenance gel is also relatively large. Therefore, it is further designed as a structure composed of a dense outer layer and a permeable inner layer, which can ensure both the strength of the channel and the replacement of the maintenance gel.

[0028] In some embodiments, the maintenance channel 2 is located on one side of the back steel reinforcement surface of the protective shell 1, and its length is 3-6 cm, which can be adjusted according to the thickness of the concrete protective layer. Specifically, there can be one or more maintenance channels 2. In this embodiment of the present invention, there are two channels, which are symmetrically distributed vertically on one side of the back steel reinforcement surface of the protective shell 1.

[0029] It should be noted that this application does not have special requirements for the pore structure and shape of the first permeable inner layer 102 and the second permeable inner layer 202, as long as they can meet the water permeability requirements and enable the flow, transport, and storage of the maintenance gel. For example, combined with Figure 3 , Figure 4 As shown, in some embodiments, the channels of the first permeable inner layer 102 and the second permeable inner layer 202 are generally distributed in a honeycomb structure, wherein at least some adjacent channels 103 are connected by through holes in the sidewalls of the channels.

[0030] As a preferred embodiment of the present invention, the strength of the first dense outer layer 101 of the protective shell 1 is not less than 10 MPa, so as to ensure its protective effect on the sacrificial metal.

[0031] It should be noted that this application does not limit the material and molding process of the dense outer layer and the water-permeable inner layer of the protective shell 1 and the maintenance channel 2, as long as the structure (externally sealed and internally distributed with water-permeable pores) can be formed and its working requirements, such as strength requirements, can be met. The dense outer layer and the water-permeable inner layer can be integrally formed or separately formed.

[0032] In some embodiments, the protective shell 1 is formed by layered mortar casting, with the inner layer forming a connected porous structure (porous mortar) and the outer layer forming a closed structure. Specifically, different casting mold designs can be used to meet the structural casting requirements of the inner and outer layers.

[0033] In other embodiments, the protective shell 1 is made of sintered ceramic, wherein the outer layer forms a dense ceramic structure and the inner layer forms interconnected pores, i.e., porous ceramic.

[0034] There are no restrictions on the specific forming processes of the aforementioned porous mortar and porous ceramics; existing technologies can be directly adopted, such as adding pore-forming agents to the sintering raw materials for porous ceramics.

[0035] In a preferred embodiment, the sacrificial metal 4 is connected with a connecting contact angle 3, which protrudes from the inner side of the protective shell 1 near the reinforcing bar, for electrically connecting the sacrificial metal 4 and the reinforcing bar. This embodiment directly integrally forms the connecting contact angle on the sacrificial metal for electrical connection with the reinforcing bar, thus preventing the problem of loosening of the connection points that can easily occur when using welding or other connection methods due to different materials. This effectively improves the service life of the sacrificial anode and helps ensure the normal operation and safety of the sacrificial anode.

[0036] In some embodiments, the inner surface of the protective shell 1 near the reinforcing bar is machined into an arc-shaped structure that matches the outer diameter of the reinforcing bar 1. The arc-shaped design increases the relative area between the sacrificial anode and the reinforcing bar, thereby improving the protective effect on the reinforcing bar. Furthermore, the back surface of the protective shell 1 away from the reinforcing bar is also machined into an arc-shaped structure, thereby increasing the contact area between the sacrificial anode and the concrete, and thus more effectively protecting ion migration within the concrete.

[0037] However, it should be noted that the shape of the protective shell is not limited to the aforementioned arc-shaped structure; it can also be square or other three-dimensional structures.

[0038] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A maintainable embedded sacrificial anode for protecting concrete reinforcing steel from corrosion, characterized in that, include: Sacrificial metal (4); A protective outer shell (1), enclosing the sacrificial metal (4), includes a first dense outer layer (101) and a first water-permeable inner layer (102) located inside the first dense outer layer (101), the first water-permeable inner layer (102) having at least partially interconnected channels (103); and Maintenance channel (2), which is located in the first dense outer layer (101), is used to connect the first permeable inner layer (102) with the outside of the poured concrete.

2. The maintainable embedded sacrificial anode for protecting concrete reinforcement from corrosion according to claim 1, characterized in that, The maintenance channel (2) includes a second dense outer layer (201) and a second permeable inner layer (202) located inside the second dense outer layer (201), the second permeable inner layer (202) having interconnected channels.

3. The maintainable embedded sacrificial anode for protecting concrete reinforcement from corrosion according to claim 2, characterized in that, The pores of the first permeable inner layer (102) and the second permeable inner layer (202) are distributed in a honeycomb structure.

4. The maintainable embedded sacrificial anode for protecting concrete reinforcement from corrosion according to any one of claims 1-3, characterized in that, The strength of the first dense outer layer (101) is not less than 10 MPa.

5. The maintainable embedded sacrificial anode for protecting concrete reinforcement from corrosion according to any one of claims 1-3, characterized in that, The first dense outer layer (101) and the first permeable inner layer (102) are formed by layering mortar.

6. The maintainable embedded sacrificial anode for protecting concrete reinforcement from corrosion according to any one of claims 1-3, characterized in that, The first permeable inner layer (102) is made of porous ceramic.

7. The maintainable embedded sacrificial anode for protecting concrete reinforcement from corrosion according to any one of claims 1-3, characterized in that, The maintenance channel (2) is located on one side of the back steel reinforcement surface of the protective shell (1).

8. The maintainable embedded sacrificial anode for protecting concrete reinforcement from corrosion according to claim 7, characterized in that, The number of maintenance channels (2) is at least one, and its length is 3-6cm.

9. The maintainable embedded sacrificial anode for protecting concrete reinforcement from corrosion according to any one of claims 1-3, characterized in that, The sacrificial metal (4) is connected to a connecting contact angle (3), which protrudes from the inner side of the protective shell (1) near the reinforcing bar, and is used to electrically connect the sacrificial metal (4) and the reinforcing bar.

10. The maintainable embedded sacrificial anode for protecting concrete reinforcement from corrosion according to claim 8, characterized in that, The inner side of the protective shell (1) near the reinforcing bar is processed into an arc-shaped structure that matches the outer diameter of the reinforcing bar.

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