Maintenance and reinforcement structure of two-way curved arch bridge

Abstract

The utility model relates to the field of bridge reconstruction and expansion in bridge engineering, in particular to a maintenance and reinforcement structure of a two-way curved arch bridge. The reinforcing structure is installed on arch ribs and arch waves of the two-way curved arch bridge and is characterized in that embedded steel bars are embedded in the arch ribs and the arch waves, special-shaped steel boxes are installed on the arch ribs and the arch waves, welding nails are welded to the surfaces of the special-shaped steel boxes, a reinforcing mesh is arranged in the section of a cavity defined by the special-shaped steel boxes, the arch ribs and the arch waves, and C40 self-compacting concrete is injected into the cavity. The self-compacting concrete is connected with the arch ribs and the arch waves through embedded steel bars, the self-compacting concrete is connected with the special-shaped steel box through welding studs, the two-way curved arch bridge can be transformed into a box-shaped arch under the condition that an existing bridge structure is not damaged, the cross section area of the main arch ring is increased, the upper structure of the whole bridge forms a firm whole, and the whole bridge is not damaged. The problem that the integrity of the main arch ring of the two-way curved arch bridge is poor is solved, the bending resistance and torsional rigidity of the structure are remarkably improved, the relative deformation of the combined structure is remarkably reduced, and therefore the bearing capacity of the bridge is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of bridge engineering and bridge reconstruction and expansion, specifically a repair and reinforcement structure for a hyperbolic arch bridge. Background Technology

[0002] The hyperbolic arch bridge is a unique type of low-reinforced concrete arch bridge created in my country. Structurally, it inherits the excellent traditions of stone arch bridges while incorporating the advantages of modern prefabricated reinforced concrete bridges. Its appearance also possesses distinctive national characteristics, making it a unique arch bridge type in my country. However, due to the structural and construction characteristics and design flaws of hyperbolic arch bridges, especially with the continuous development of my country's transportation and the rapid increase in heavy-duty vehicles, many low-load-bearing hyperbolic arch bridges built in the 1970s have gradually developed varying degrees and types of defects and damage under long-term overload operation. This has further led to insufficient bridge load-bearing capacity, even endangering traffic safety and affecting normal traffic flow. Utility Model Content

[0003] This utility model provides a repair and reinforcement structure for hyperbolic arch bridges, which effectively solves the inherent deficiencies and structural defects of hyperbolic arch bridges, improves load-bearing capacity, and enables rapid and convenient reinforcement of bridge structures without interrupting traffic or damaging the existing structure, thereby significantly improving the bridge's load-bearing capacity.

[0004] The specific technical solution of this utility model is as follows:

[0005] A repair and reinforcement structure for a hyperbolic arch bridge includes a reinforcement structure installed on the arch ribs and arch waves of the hyperbolic arch bridge, with reinforcing bars embedded in the arch ribs and arch waves; irregularly shaped steel boxes are installed on the arch ribs and arch waves, and welding studs are welded to the surface of the irregularly shaped steel boxes; a steel mesh is set in the cavity section formed by the irregularly shaped steel boxes, the arch ribs, and the arch waves, and C40 self-compacting concrete is injected into the cavity; the self-compacting concrete is connected to the arch ribs and arch waves by reinforcing bars, and the self-compacting concrete is connected to the irregularly shaped steel boxes by welding studs.

[0006] Furthermore, the ends of the rebar extend beyond the surfaces of the arch ribs and arch waves, and the ends are shaped.

[0007] Furthermore, the end of the welding stud is a cylindrical head.

[0008] Furthermore, a steel mesh is installed within the cavity section formed by the irregular steel box, the arch rib, and the arch wave, and self-compacting concrete is symmetrically injected in segments on both sides of the steel mesh.

[0009] Furthermore, the self-compacting concrete is C40 self-compacting concrete.

[0010] The beneficial effects of this utility model are: (1) This structure can transform the hyperbolic arch bridge into a box arch without damaging the existing bridge structure, increase the cross-sectional area of ​​the main arch ring, and make the superstructure of the entire bridge form a solid whole, thus solving the problem of the poor integrity of the main arch ring of the hyperbolic arch bridge.

[0011] (2) The bending and torsional stiffness of this structure is significantly increased, and the relative deformation of the composite structure is significantly reduced, thereby greatly improving the load-bearing capacity of the bridge.

[0012] (3) This structure can be constructed by using full-span scaffolding or suspended mobile formwork for on-site casting. The materials are readily available, the construction is simple, convenient and safe, the project cost is low, and it does not interrupt traffic. There are no uncertainties such as flood control assessment. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the reinforced and unreinforced sections of this utility model;

[0014] Figure 2 This is a schematic diagram of the installation structure of the reinforced section of this utility model;

[0015] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0016] The following are shown in the figure: 1. Arch rib; 2. Arch wave; 3. Arch plate; 4. Rebar anchor; 5. Irregular steel box; 6. Weld stud; 7. Self-compacting concrete; 8. φ10 steel mesh. Detailed Implementation

[0017] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments:

[0018] Example 1

[0019] like Figures 1-3 The aforementioned maintenance and reinforcement structure for a hyperbolic arch bridge effectively enhances the structural strength and stability of the hyperbolic arch bridge and extends its service life by forming an irregularly shaped steel box-concrete composite section.

[0020] The specific installation steps are as follows:

[0021] Before reinforcement, a comprehensive structural inspection and assessment of the hyperbolic arch bridge is required. This includes, but is not limited to, a detailed examination of cracks, deformations, corrosion, and other damage to arch rib 1 and arch wave 2.

[0022] After determining the reinforcement location, the rebar 4 is installed. High-strength steel bars are typically selected for rebar 4, with their diameter and length determined based on the specific conditions of the bridge structure. The ends of rebar 4 are designed in an L-shape to increase the contact area with the self-compacting concrete and improve anchorage force.

[0023] The irregularly shaped steel box 5 is customized according to the geometry of the bridge arch rib 1 and arch wave 2 to ensure a tight fit with the bridge structure. Before installation, the irregularly shaped steel box 5 undergoes rigorous quality inspection to ensure its dimensional accuracy and surface quality meet requirements. During installation, specialized fixing devices are used to secure the steel box in the predetermined position, ensuring its alignment with the bridge structure.

[0024] Welding studs 6 are welded onto the surface of the irregularly shaped steel box 5. The material and specifications of the welding studs 6 are selected according to the design requirements. The ends of the welding studs 6 are designed as cylindrical heads to increase the contact area with the self-compacting concrete 7 and improve the connection strength.

[0025] A reinforcing mesh 8 is installed within the cavity section formed by the irregular steel box 5, the arch rib 1, and the arch wave 2. The design of the reinforcing mesh 8 takes into account the load-bearing requirements of the reinforced structure and the ease of construction. The arrangement of the reinforcing mesh 8 should be uniform and matched with the positions of the anchor bars 4 and welding studs (6) to ensure the stability of the overall structure.

[0026] The self-compacting concrete 7 uses C40 self-compacting concrete, a high-performance concrete with good fluidity and self-compacting ability, capable of filling the gaps between the reinforcing mesh 8 and the irregularly shaped steel box 5. Before injection, the concrete undergoes strict proportioning and mixing to ensure its performance meets design requirements. During injection, a symmetrical, segmented approach is adopted to avoid structural deformation caused by concrete flow.

[0027] After reinforcement is completed, the reinforced area should be properly cured, such as by keeping it moist and avoiding high temperatures, to ensure the strength development of the concrete. After the curing period, the reinforced area should be tested again, including the concrete strength, structural stability, and load-bearing capacity, to verify the reinforcement effect.

[0028] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

[0029] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A repair and reinforcement structure of a double-arch bridge, the reinforcement structure being installed on an arch rib and an arch wave of the double-arch bridge, characterized in that: The arch rib and the arch wave are implanted with the anchorage bar; The special-shaped steel box is provided with welding nails on the surface; The steel bar net is arranged in the cavity section surrounded by the special-shaped steel box, the arch rib and the arch wave, and C40 self-compacting concrete is injected into the cavity.

2. The repair and reinforcement structure of a double-curvature arch bridge according to claim 1, characterized in that: The end of the anchorage bar extends out of the surface of the arch rib and the arch wave, and the end is shaped.

3. The repair and reinforcement structure of a double-curvature arch bridge according to claim 1, characterized in that: The end of the welding nail is a cylindrical head.

4. The repair and reinforcement structure of a double-curvature arch bridge according to any one of claims 1-3, characterized in that: The steel bar net is arranged in the cavity section surrounded by the special-shaped steel box, the arch rib and the arch wave, and the C40 self-compacting concrete is symmetrically segmented and injected into the two sides of the steel bar net.

5. The repair and reinforcement structure of a double-curved arch bridge according to any one of claims 1-3, characterized in that: The self-compacting concrete is C40 self-compacting concrete.

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