Prestressed high-strength threaded steel bar

Abstract

The utility model relates to threaded steel bar technical field discloses a prestressed high strength threaded steel bar, including steel bar main part, the inside of steel bar main part is provided with base body, the outer wall of base body is provided with performance reinforcing component, the end of steel bar main part is provided with protection component, the outer wall of steel bar main part is wrapped and is provided with thread strip, performance reinforcing component includes bottom layer, bottom layer sets up the outer wall of base body, the outer wall of bottom layer is provided with intermediate layer, the outer wall of intermediate layer is provided with outer layer, protection component includes protection cover, the inner wall of the upper end of protection cover is fixed and is provided with sealing washer, the end of steel bar main part is engaged and is arranged in sealing washer, in the utility model, through the performance reinforcing component that is equipped, through multilayer structure forms the cooperative protection, significantly improves the corrosion resistance and durability of steel bar, and simultaneously through the protection component that is equipped, effectively prevents moisture, oxygen and corrosive medium from the steel bar end face invasion.

Description

Technical Field

[0001] This utility model relates to the field of threaded steel bar technology, and in particular to a prestressed high-strength threaded steel bar. Background Technology

[0002] Prestressed high-strength threaded steel bars are characterized by high strength and high toughness, and are widely used in major infrastructure projects such as bridges, high-rise buildings, and nuclear power plants. Their durability is directly related to the safe service life of the structure.

[0003] Currently, existing protective technologies for prestressed high-strength threaded steel bars have significant drawbacks: First, the protective layer design is simple and cannot cope with complex corrosive environments, making it easy for corrosive media to penetrate. Second, the protection of the steel bar end face is weak. As a cross-section without oxide layer protection and with micro-cracks, the end face is extremely susceptible to intrusion by corrosive media. Existing technologies often neglect end face protection, leading to rapid longitudinal expansion of rust from the end face to the steel bar, accelerating overall failure.

[0004] Therefore, those skilled in the art have provided a prestressed high-strength threaded steel bar to solve the problems mentioned in the background art. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a prestressed high-strength threaded steel bar. Through the performance enhancement components, a multi-layer structure forms synergistic protection. The bottom layer provides sacrificial anode protection, the middle layer enhances adhesion, and the outer layer resists mechanical damage and ultraviolet aging, significantly improving the corrosion resistance and durability of the steel bar. At the same time, through the protective components, in which the protective cap cooperates with the sealing ring, moisture, oxygen and corrosive media are prevented from entering from the end face of the steel bar, avoiding longitudinal corrosion caused by end face rust.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A prestressed high-strength threaded steel bar includes a steel bar body, a matrix is ​​provided inside the steel bar body, a performance reinforcing component is provided on the outer wall of the matrix, a protective component is provided at the end of the steel bar body, and a threaded strip is wrapped around the outer wall of the steel bar body;

[0008] The performance enhancement component includes a bottom layer, which is disposed on the outer wall of the substrate. An intermediate layer is disposed on the outer wall of the bottom layer, and an outer layer is disposed on the outer wall of the intermediate layer. The protection component includes a protective cover, on the upper inner wall of the protective cover, a sealing ring is fixedly disposed, and the end of the steel bar body is engaged in the sealing ring.

[0009] The above technical solution forms a synergistic protection through a multi-layer structure (zinc-aluminum-magnesium alloy coating + epoxy resin coating + nano-silica modified polyurethane coating). The bottom layer provides sacrificial anode protection, the middle layer enhances adhesion, and the outer layer resists mechanical damage and ultraviolet aging, significantly improving the corrosion resistance and durability of the steel bars. At the same time, the protective cover and sealing ring work together to prevent moisture, oxygen and corrosive media from penetrating from the end face of the steel bars, avoiding longitudinal corrosion caused by end face rust.

[0010] Furthermore, the inner wall of the protective cover is provided with multiple spring grooves at the lower part, and each of the multiple spring grooves is movably provided with a locking block. Each of the multiple locking blocks is engaged with the recess of the threaded strip, and a return spring is fixedly connected between each of the multiple locking blocks and the inner wall of the opposite end of the corresponding spring groove.

[0011] The above technical solution, with its included return spring and locking block, facilitates the quick installation and removal of the protective cover. The return spring also ensures that the locking block maintains an outward pushing force, guaranteeing a tight engagement between the locking block and the threaded strip, thereby improving the stability of the protective cover.

[0012] Furthermore, the bottom layer is made of zinc-aluminum-magnesium alloy coating material, the middle layer is made of epoxy resin coating material, and the outer layer is made of nano-silica modified polyurethane coating material;

[0013] Through the above technical solutions, a zinc-aluminum-magnesium alloy coating is hot-dip plated onto the substrate surface, thereby achieving all-round protection of the substrate through the "micro-battery effect". An epoxy resin coating is electrostatically sprayed onto the bottom layer surface, thereby filling the micropores on the coating surface and blocking the penetration path of corrosive media through its excellent adhesion and chemical resistance. By coating the intermediate layer surface with nano-silica modified polyurethane, the surface hardness and wear resistance can be improved, and ultraviolet rays can be scattered to delay coating aging and extend the protection life.

[0014] Furthermore, the protective cover is made of polycarbonate material, and the sealing ring is made of silicone rubber material;

[0015] The above technical solution uses polycarbonate material to make a protective cover, which has good weather resistance and stable performance in an environment of -40℃ to 120℃, making it suitable for long-term outdoor use. The sealing ring made of silicone rubber material can ensure a tight fit with the end face of the steel bar and has excellent aging resistance, and is not easy to crack in ozone and ultraviolet light environments.

[0016] Furthermore, the upper and lower ends of each of the multiple card blocks are chamfered;

[0017] With the above technical solution, by providing a chamfer, during installation, the chamfer guides the locking block to slide into the recess along the inclined surface of the threaded strip, avoiding direct collision between the locking block and the thread peak, which would cause damage. During disassembly, force is applied to move the protective cover, and the chamfer allows the locking block to smoothly disengage from the threaded recess, reducing friction and lowering the difficulty of operation.

[0018] This utility model has the following beneficial effects:

[0019] 1. The present invention proposes a prestressed high-strength threaded steel bar, which, through the provision of performance-enhancing components, forms a synergistic protection through a multi-layer structure (zinc-aluminum-magnesium alloy coating + epoxy resin coating + nano-silica modified polyurethane coating). The bottom layer provides sacrificial anode protection, the middle layer enhances adhesion, and the outer layer resists mechanical damage and ultraviolet aging, significantly improving the corrosion resistance and durability of the steel bar. At the same time, through the provision of protective components, in which the protective cap cooperates with the sealing ring, moisture, oxygen and corrosive media are prevented from penetrating from the end face of the steel bar, avoiding longitudinal expansion corrosion caused by end face rust. Furthermore, installation and disassembly are simple and quick. Attached Figure Description

[0020] Figure 1 This is an isometric schematic diagram of a prestressed high-strength threaded steel bar proposed in this utility model;

[0021] Figure 2 This is a schematic diagram of the internal structure of a prestressed high-strength threaded steel bar according to the present invention.

[0022] Figure 3 This is a partial orthogonal sectional view of a prestressed high-strength threaded steel bar proposed in this utility model;

[0023] Figure 4 for Figure 3 Enlarged structural diagram at point A;

[0024] Figure 5 This is a bottom view schematic diagram of a protective cover for a prestressed high-strength threaded steel bar proposed in this utility model.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Reinforcing steel body; 2. Performance-enhancing components; 3. Protective components; 4. Base; 5. Bottom layer; 6. Intermediate layer; 7. Outer layer; 8. Protective cover; 9. Sealing ring; 10. Spring groove; 11. Locking block; 12. Return spring; 13. Threaded strip; 14. Chamfer. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of specific embodiments. Obviously, the described specific embodiments are only a part of the specific embodiments of the present invention, and not all of them. Based on the specific embodiments of the present invention, all other specific embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Reference Figure 1-5 The present invention provides a specific embodiment: a prestressed high-strength threaded steel bar, including a steel bar body 1, a base 4 is provided inside the steel bar body 1, a performance strengthening component 2 is provided on the outer wall of the base 4, a protective component 3 is provided at the end of the steel bar body 1, and a threaded strip 13 is provided on the outer wall of the steel bar body 1.

[0029] The performance enhancement component 2 includes a bottom layer 5, which is disposed on the outer wall of the substrate 4. An intermediate layer 6 is disposed on the outer wall of the bottom layer 5, and an outer layer 7 is disposed on the outer wall of the intermediate layer 6. The bottom layer 5 is made of a zinc-aluminum-magnesium alloy coating material, the intermediate layer 6 is made of an epoxy resin coating material, and the outer layer 7 is made of a nano-silica modified polyurethane coating material. By hot-dip galvanizing the zinc-aluminum-magnesium alloy coating onto the surface of the substrate 4, all-round protection of the substrate 4 is achieved through the "micro-battery effect." By electrostatically spraying the epoxy resin coating onto the surface of the bottom layer 5, its excellent adhesion and chemical resistance fill the micropores on the coating surface, blocking the penetration path of corrosive media. By coating the intermediate layer 6 with nano-silica modified polyurethane, surface hardness and wear resistance are improved, and ultraviolet rays are scattered, delaying coating aging and extending the protective life. The protection component 3 includes a protective cover 8, with a sealing ring 9 fixedly disposed on the upper inner wall of the protective cover 8. The end of the reinforcing bar body 1 is engaged within the sealing ring 9. The protective cover 8 is made of polycarbonate material, and the sealing ring 9 is made of silicone rubber material. By using polycarbonate material for the protective cover 8, it has good weather resistance and stable performance in environments ranging from -40℃ to 120℃, making it suitable for long-term outdoor use. By using silicone rubber material for the sealing ring 9, it can ensure a tight fit with the end face of the reinforcing bar and has excellent aging resistance, making it less prone to cracking in ozone and ultraviolet environments. A multi-layer coating structure (zinc-aluminum-magnesium alloy coating + epoxy resin coating + nano-silica modified polyurethane coating) forms a synergistic protection. The bottom layer 5 provides sacrificial anode protection, the middle layer 6 enhances adhesion, and the outer layer 7 resists mechanical damage and ultraviolet aging, significantly improving the corrosion resistance and durability of the reinforcing bar. At the same time, the protective cover 8 and the sealing ring 9 work together to prevent moisture, oxygen, and corrosive media from penetrating from the end face of the reinforcing bar, avoiding longitudinal corrosion caused by end face rust.

[0030] Multiple spring-loaded grooves 10 are provided on the lower part of the inner wall of the protective cover 8. Each spring-loaded groove 10 has a movable locking block 11 inside. Each locking block 11 is engaged with the recess of the threaded strip 13. A return spring 12 is fixedly connected between each locking block 11 and the inner wall of the opposite end of the corresponding spring-loaded groove 10. Each locking block 11 has a chamfer 14 at both the upper and lower ends. During installation, the chamfer 14 guides the locking block 11 to slide into the recess along the inclined surface of the threaded strip 13, avoiding direct collision between the locking block 11 and the thread peak, which would cause damage. During disassembly, the protective cover 8 is pulled with force, and the chamfer 14 allows the locking block 11 to smoothly disengage from the threaded recess, reducing friction and simplifying the operation. The provided return spring 12 and locking block 11 facilitate the quick installation and disassembly of the protective cover 8. The return spring 12 also ensures that the locking block 11 always maintains an outward pushing force, ensuring that the locking block 11 and the threaded strip 13 are tightly engaged, thereby improving the stability of the protective cover 8.

[0031] Working Principle: Through the performance-enhancing component 2, a multi-layered structure (zinc-aluminum-magnesium alloy coating + epoxy resin coating + nano-silica-modified polyurethane coating) forms a synergistic protection, significantly improving the corrosion resistance and durability of the reinforcing steel. Specifically, a bottom layer 5 made of zinc-aluminum-magnesium alloy coating material is applied to the surface of the substrate 4, which provides all-round protection to the substrate 4 through the "micro-battery effect," i.e., sacrificial anode protection. An intermediate layer 6 made of epoxy resin coating material is applied to the surface of the bottom layer 5. Its excellent adhesion and chemical resistance fill the micropores on the coating surface, blocking the penetration path of corrosive media. Finally, an outer layer made of nano-silica-modified polyurethane coating material is applied to the surface of the intermediate layer 6. 7. It can improve surface hardness and wear resistance, resist mechanical damage, and scatter ultraviolet rays, delay coating aging, and extend the protection life. In addition, since the end face is the cross-section of the steel bar, there is no oxide layer protection, and the cutting process may produce micro cracks, making it more susceptible to penetration by corrosive media. In order to avoid longitudinal expansion corrosion caused by end face rust, the protective cover 8 is clipped onto the end face of the steel bar body 1 by the provided protective component 3. The provided return spring 12 keeps the clip 11 pushing outward at all times, ensuring that the clip 11 and the threaded strip 13 are tightly engaged, thereby improving the stability of the protective cover 8. The provided sealing ring 9 ensures a tight fit with the end face of the steel bar, thereby preventing moisture, oxygen and corrosive media from entering from the end face of the steel bar.

[0032] The following points should be noted in this article:

[0033] 1. The accompanying drawings of the embodiments disclosed herein only relate to the structures involved in the embodiments disclosed herein; other structures can be referred to in general design.

[0034] 2. Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0035] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing specific embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A prestressed high-strength threaded steel bar, comprising a steel bar body (1), characterized in that: The interior of the steel bar body (1) is provided with a base (4), the outer wall of the base (4) is provided with a performance strengthening component (2), the end of the steel bar body (1) is provided with a protective component (3), and the outer wall of the steel bar body (1) is wrapped with a threaded strip (13). The performance enhancement component (2) includes a bottom layer (5), which is disposed on the outer wall of the base (4). The outer wall of the bottom layer (5) is provided with an intermediate layer (6), and the outer wall of the intermediate layer (6) is provided with an outer layer (7). The protection component (3) includes a protective cover (8), and a sealing ring (9) is fixedly disposed on the upper inner wall of the protective cover (8). The end of the steel bar body (1) is engaged in the sealing ring (9).

2. The prestressed high-strength threaded steel bar according to claim 1, characterized in that: The inner wall of the protective cover (8) is provided with multiple spring grooves (10) at the lower part. Each of the multiple spring grooves (10) is provided with a locking block (11). Each of the multiple locking blocks (11) is engaged with the recess of the threaded strip (13). Each of the multiple locking blocks (11) and the inner wall of the opposite end of the corresponding spring groove (10) is fixedly connected with a return spring (12).

3. The prestressed high-strength threaded steel bar according to claim 1, characterized in that: The bottom layer (5) is made of zinc-aluminum-magnesium alloy coating material, the middle layer (6) is made of epoxy resin coating material, and the outer layer (7) is made of nano-silica modified polyurethane coating material.

4. The prestressed high-strength threaded steel bar according to claim 1, characterized in that: The protective cover (8) is made of polycarbonate material, and the sealing ring (9) is made of silicone rubber material.

5. A prestressed high-strength threaded steel bar according to claim 2, characterized in that: The upper and lower ends of the plurality of card blocks (11) are provided with chamfers (14).

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