Prestressed anchoring device for single-tower steel-concrete joint segment

Abstract

This utility model provides a prestressed anchoring device for a single-tower steel-concrete composite section. The anchoring device is installed on a steel box girder and includes an anchor plate, a trumpet tube, a corrugated pipe, an anchor plate, an anchor cover, and several steel strands. The anchor plate, trumpet tube, and corrugated pipe are connected in sequence, and each of the anchor plate, trumpet tube, and corrugated pipe has an axially penetrating cavity. A grouting pipe extending to the outside of the steel box girder is provided on the anchor plate. One end of each steel strand is fixed to the anchor plate, and the other end extends along the length of the cavity. The anchor cover is fitted over the anchor plate and fixed to the anchor plate. In this prestressed anchoring device for a single-tower steel-concrete composite section, the anchor plate and steel strands are externally anchored, which is convenient for construction. After anchoring, the external opening is sealed with concrete, and then sealed with an anchor cover, which serves the purposes of moisture and rust prevention. In addition, the shape of the anchor plate can be specifically designed according to the specific location, and the length of the steel strands can be set according to the stress strength.

Description

Technical Field

[0001] This utility model relates to the field of bridge structure technology, specifically to a prestressed anchoring device for a single-tower steel-concrete composite section. Background Technology

[0002] The connection structure between the stay cables and the main steel girder of a steel box girder cable-stayed bridge (i.e., the cable-beam anchorage structure) is one of the most critical and stress-complex areas of the steel box girder, as the structure that directly bears and transmits the cable force.

[0003] In single-cable-stayed bridges with a single tower, the steel anchor box structure and the concrete main tower represent a unique structural combination. The steel anchor box is a commonly used structural form in cable-stayed bridges, primarily located on the upper or side parts of the main tower to anchor the stay cables. The steel anchor box structure boasts high strength and stiffness, effectively bearing the load transmitted by the stay cables and distributing it evenly throughout the main tower. This structural form ensures that the main tower maintains good load-bearing capacity and stability even under large cable forces. Combining the steel anchor box with the concrete main tower not only increases the load-bearing capacity of the main tower but also enhances its overall integrity.

[0004] Currently, anchorages are often pre-embedded in steel box girders. However, the dimensions cannot be adjusted after pre-embedding, making it impossible to design dimensions according to the actual stress location, which has certain drawbacks. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this utility model provides a prestressed anchoring device for a single-tower steel-concrete composite section, which solves the problems mentioned in the background art.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a prestressed anchoring device for a single-tower steel-concrete composite section. The anchoring device is installed on a steel box girder and includes an anchor plate, a trumpet tube, a corrugated tube, an anchor plate, an anchor cover, and several steel strands. The anchor plate, trumpet tube, and corrugated tube are connected in sequence. The anchor plate, trumpet tube, and corrugated tube contain axially penetrating cavities. A grouting pipe extending to the outside of the steel box girder is provided on the anchor plate. One end of several steel strands is fixed to the anchor plate, and the other end extends along the length of the cavity. The anchor cover is fitted over the anchor plate and fixed to the anchor plate.

[0009] Preferably, the anchor cover and the anchor plate are connected by bolts, and the anchor cover is provided with a grouting port.

[0010] Preferably, the grouting port is a threaded port, and a nut is threaded onto the grouting port.

[0011] Preferably, the anchor plate has several through holes through which steel strands can pass, and clamps for fixing the steel strands are provided in the through holes.

[0012] Preferably, the number of perforations is 9 to 15, and the perforations are evenly arranged in multiple rings on the anchor plate.

[0013] Preferably, a constraint ring is fitted at the connection between the horn tube and the corrugated tube.

[0014] (III) Beneficial Effects

[0015] This utility model provides a prestressed anchoring device for a single-tower steel-concrete composite section. It has the following beneficial effects:

[0016] 1. The prestressed anchoring device for this single-tower steel-concrete composite section features external anchoring of the anchor plate and steel strands, facilitating construction. After anchoring, the external portion is sealed with concrete, and then further sealed with an anchor cover, achieving moisture and rust prevention. Furthermore, the shape of the anchor plate can be specifically designed according to the location, and the length of the steel strands can be set according to the stress intensity, offering high adjustability. Attached Figure Description

[0017] Figure 1 This is a side sectional view of the anchoring device of this utility model;

[0018] Figure 2 This is a schematic diagram of the installation of the anchoring device of this utility model;

[0019] Figure 3 This is a cross-sectional view of the anchor plate of this utility model.

[0020] In the figure: 1 Anchoring device, 2 Steel box girder, 11 Anchor plate, 12 Trumpet pipe, 13 Corrugated pipe, 14 Anchor plate, 15 Anchor cover, 16 Steel strand, 17 Grouting pipe, 18 Grouting port, 19 Chamber, 20 Perforation, 21 Bottom plate, 22 Top plate, 23 Web plate, 3 Wedge, 4 Constraint ring. Detailed Implementation

[0021] This utility model embodiment provides a prestressed anchoring device for a single-tower steel-concrete composite section, such as... Figure 1-3 As shown, anchoring device 1 is installed on steel box girder 2.

[0022] The anchoring device 1 includes an anchor plate 11, a bell-shaped tube 12, a corrugated tube 13, an anchor plate 14, an anchor cover 15, and several steel strands 16.

[0023] like Figure 1-2As shown, anchor plate 11, flared pipe 12, and corrugated pipe 13 are connected in sequence. These components are embedded in the steel box girder 2, with the outer surface of anchor plate 11 protruding from the steel box girder 2. The end of flared pipe 12 connected to anchor plate 11 has a larger diameter, while the end connected to corrugated pipe 13 has a smaller diameter. A constraint ring 4 is fitted at the connection between flared pipe 12 and corrugated pipe 13. The flared pipe 12 and corrugated pipe 13 are secured at both ends of the constraint ring 4, connecting them through the constraint ring 4.

[0024] The anchor plate 11, the horn tube 12, and the corrugated pipe 13 form an axially continuous chamber 19, which is used for grouting. A grouting pipe 17 extending to the outside of the steel box girder 2 is provided on the anchor plate 11, and the grouting pipe 17 is bent at a right angle. One end of several steel strands 16 is fixed to the anchor plate 14, and the other end extends along the length of the chamber 19.

[0025] The anchor plate 14 has several through holes 20 for the steel strand 16 to pass through. The size of the through holes 20 is determined according to the diameter of the steel strand 16. Clamping pieces 3 are installed in the through holes to fix the steel strand 16. The clamping pieces 3 are used to position the steel strand 16 and prevent its axial displacement.

[0026] like Figure 3 As shown, there are 9 to 15 perforations 20, which are evenly arranged in multiple rings on the anchor plate 14.

[0027] In this implementation, three different numbers of perforated anchor plates 14 are used, with 9, 12, and 15 perforations respectively. For example... Figure 1 As shown, the steel box girder 2 includes a bottom plate 21, a top plate 22, and a web plate 23 disposed between the two. Twelve-hole anchor plates 14 are arranged in the bottom plate 21. Since the bottom plate 21 contains U-ribs and vertical plates, the shape of the anchor plates 14 can be configured to fit these components. Fifteen-hole anchor plates 14 are arranged in the top plate 22 and web plate 23. Since the top plate 22 contains U-ribs and vertical plates, the shape of the anchor plates 14 can be configured to fit these components. All nine-hole anchor plates 14 are arranged in the top plate 22.

[0028] Anchor cover 15 is fitted over anchor plate 14 and fixed to anchor pad 11. The anchor cover 15 is used to position the anchor plate 14.

[0029] The anchor cover 15 is connected to the anchor plate 14 by bolts, and the anchor cover 15 is provided with a grouting port 18. The anchor cover 15 is filled with the same cement grout as the chamber 19. Before sealing the anchor, the joint between the anchor plate 14 and the anchor pad 11 should be waterproofed. The grouting port 18 is a threaded port, and a nut is threaded onto the grouting port 18.

[0030] Working principle: First, the anchor plate 11, trumpet pipe 12, and corrugated pipe 13 are pre-embedded in the steel box girder 2, with the outer side of the anchor plate 11 protruding from the steel box girder 2. Next, one end of the steel strand 16 is fixed in the through hole 20 of the anchor plate 14 through the clamp 3. Then, anchor plates 14 with different numbers of through holes 20 are installed on the anchor plates 11 on the corresponding bottom plate 21, top plate 22, and web plate 23. Next, the anchor cover 15 is fitted over the anchor plate 14 and fixed to the anchor plate 11. Then, cement grout is injected into the grouting pipe 17 and grouting port 18 in sequence. Finally, after construction is completed, the user must apply the same anti-corrosion treatment, such as anti-corrosion coating, to all exposed steel components of the anchor and its accessories as to other steel components in the matching structure.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A prestressed anchoring device for a single-tower steel-concrete composite section, wherein the anchoring device (1) is installed on a steel box girder (2), characterized in that: The anchoring device (1) includes an anchor plate (11), a trumpet tube (12), a corrugated tube (13), an anchor plate (14), an anchor cover (15), and several steel strands (16). The anchor plate (11), the trumpet tube (12), and the corrugated tube (13) are connected in sequence. The anchor plate (11), the trumpet tube (12), and the corrugated tube (13) are axially connected chambers (19). The anchor plate (11) is provided with a grouting pipe (17) extending to the outside of the steel box girder (2). One end of several steel strands (16) is fixed on the anchor plate (14), and the other end extends along the length of the chamber (19). The anchor cover (15) is sleeved on the outside of the anchor plate (14) and fixed on the anchor plate (11).

2. The prestressed anchoring device for a single-tower steel-concrete composite section according to claim 1, characterized in that: The anchor cover (15) is connected to the anchor plate (14) by bolts, and the anchor cover (15) is provided with a grouting port (18).

3. The prestressed anchoring device for a single-tower steel-concrete composite section according to claim 2, characterized in that: The grouting port (18) is a threaded port, and a nut is threaded onto the grouting port (18).

4. The prestressed anchoring device for a single-tower steel-concrete composite section according to claim 1, characterized in that: The anchor plate (14) has several through holes (20) through which the steel strand (16) can pass. The through holes are provided with clips (3) for fixing the steel strand (16).

5. The prestressed anchoring device for a single-tower steel-concrete composite section according to claim 4, characterized in that: The number of perforations (20) is 9 to 15, and the perforations (20) are arranged in multiple rings evenly on the anchor plate (14).

6. The prestressed anchoring device for a single-tower steel-concrete composite section according to claim 1, characterized in that: A constraint ring (4) is fitted at the connection between the horn tube (12) and the bellows (13).

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