Notch structure for quickly replacing concrete beam expansion device
By using the design of L-shaped steel structure and embedded steel bar connectors in the bridge expansion device, the problem of cleaning the concrete boundary in the anchor area is solved, rapid replacement and universality are achieved, and maintenance costs and traffic impact are reduced.
Patent Information
- Application Number
- CN202422198698.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-09
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-09-09
AI Technical Summary
During the replacement of existing bridge expansion devices, it is difficult to clean the concrete boundary in the anchorage area, resulting in quality problems in the bonding interface between new and old materials, and the replacement time is long, which affects traffic operation, and the universality of different forms of expansion devices is insufficient.
The L-shaped steel structure is adopted, combined with embedded steel bars and embedded connectors, forming an integrated structure, clearly distinguishing the boundaries of the anchor area and the main beam concrete. Only the expansion device and the anchor area concrete need to be replaced and cleaned to simplify the replacement process.
It realizes rapid replacement of telescopic devices, reduces maintenance costs, improves universality and construction convenience, and reduces the impact on traffic.
Smart Images
Figure CN223189599U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of bridge engineering, in particular to a notch structure for quickly replacing a concrete beam expansion device. Background Art
[0002] Expansion devices are a crucial component of bridge structures, installed on the bridge deck between the ends of the bridge beams and between the beam ends and the abutment backwalls. They bear the repetitive impact of wheel loads and are exposed to the harsh atmosphere for extended periods, making them particularly vulnerable to damage and difficult to repair. Existing bridge expansion devices typically have a short service life, typically only two to three years, with some lasting only four to five years, and a breakage rate as high as 80%. Replacing expansion devices requires full or partial traffic interruption, significantly impacting traffic flow. Therefore, rapid replacement is crucial.
[0003] To address the above issues, more advanced notch materials or optimized expansion joint structures are currently being used to achieve rapid replacement. However, according to the current common expansion joint notch design for concrete beams, the concrete in the anchoring area is integrated with the box beam concrete and pavement after construction, making it difficult to distinguish the boundaries during replacement. This can make it difficult to clean the bottom of the notch, leading to quality problems at the bonding interface between the new and old materials in the expansion joint anchoring area; or the excavation is too deep, causing damage to the box beam bridge deck; even if the excavation size is basically the same as the original design notch size, the anchor bars at the anchor connection need to be repaired as a whole, involving processes such as rebar planting, and the repair time is relatively long. In addition, there are many types of expansion joints used in my country's highway bridges and urban bridges. Optimizing only one type of expansion joint cannot cover the entire range of use, and the method of optimizing expansion joints is relatively limited.
[0004] Therefore, it is urgent to construct a concrete beam expansion device slot structure that can be quickly replaced to increase universality and not be limited to the form of the expansion device. Utility Model Content
[0005] The purpose of this utility model is to overcome the above-mentioned shortcomings of the prior art and provide a notch structure for quickly replacing the expansion and contraction device of a concrete beam. By adopting an L-shaped steel structure, the boundary between the anchorage area and the main beam concrete is more clearly defined. When replacing, only the expansion and contraction device and the concrete in the anchorage area need to be replaced and cleaned, thus achieving the purpose of rapid replacement.
[0006] The purpose of the utility model can be achieved through the following technical solutions:
[0007] The utility model provides a notch structure for quickly replacing a concrete beam expansion device, comprising an L-shaped steel structure, anchoring area concrete, embedded steel bars and embedded connectors;
[0008] The L-shaped steel structure is fitted with the notch, and the L-shaped steel structure is provided with welding nails, which are used to strengthen the connection between the concrete in the anchoring area and the L-shaped steel structure in the notch;
[0009] The embedded steel bars include beam body embedded steel bars and notch embedded steel bars, the beam body embedded steel bars are fixedly connected to the embedded connectors, and the notch embedded steel bars are fixed in the concrete of the anchoring area to strengthen the connection between the expansion joint and the concrete of the anchoring area;
[0010] The embedded connector is embedded in the concrete beam, and the upper end is fixedly connected to the L-shaped steel structure in the notch.
[0011] Furthermore, the embedded connector is in the shape of a barb, and the embedded steel bars of the beam body are arranged in the barb of the embedded connector and are fixedly connected to the embedded connector.
[0012] Furthermore, the embedded connecting parts are steel bars or anchor bolts.
[0013] Furthermore, the L-shaped steel structure is formed by welding customized steel or ordinary steel plates.
[0014] Furthermore, there are a plurality of welding nails, and the plurality of welding nails are welded to the horizontal plate of the L-shaped steel structure.
[0015] Furthermore, the L-shaped steel structure is made of stainless steel or ordinary steel with an anti-corrosion coating.
[0016] Furthermore, the embedded steel bars of the beam body are fixed in the concrete beam below the notch.
[0017] Furthermore, a casting hole is provided on the horizontal surface of the L-shaped steel structure to facilitate the vibration and compaction of the concrete in the concrete beam below the notch.
[0018] Furthermore, the beam body's embedded steel bars, embedded connectors, L-shaped steel structure and concrete beam form an integrated structure.
[0019] Furthermore, the groove is filled with concrete to form anchoring area concrete, and the concrete is steel fiber concrete.
[0020] Compared with the prior art, the present invention has the following advantages and beneficial effects:
[0021] 1. The L-shaped steel structure notch in the present invention is a semi-permanent structure with low replacement frequency, good durability and low maintenance cost.
[0022] 2. The utility model adopts an L-shaped steel structure, which makes the boundary between the anchoring area and the main beam concrete clearer. When replacing, only the telescopic device and the concrete in the anchoring area need to be replaced and cleaned, which can achieve the purpose of rapid replacement.
[0023] 3. The notch structure in the present invention is not limited to the form of the telescopic device. The notch structure is simple, the connection structure is mature, and the construction is convenient. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 The figure is a structural schematic diagram of a notch structure for quickly replacing a concrete beam expansion device.
[0025] Figure 1 Description of the labels in:
[0026] 1-L-shaped steel structure, 2-weld nails, 3-anchorage area concrete, 4-embedded steel bars in beam body, 5-embedded connectors, 6-embedded steel bars in slots, 7-casting holes, 8-expansion device, 9-concrete beam, H0-total pavement thickness, C-expansion joint width, H1-slot depth, B1-fixed side slot width, B2-movable side slot width. DETAILED DESCRIPTION
[0027] The specific implementation methods of the present invention are described in detail below through examples. These examples are implemented on the premise of the scheme described in the present invention, and provide detailed implementation methods and specific operating processes, but the protection scope of the present invention is not limited to the following examples.
[0028] The present invention is further described below with reference to the accompanying drawings and specific embodiments. Any features, such as component models, material names, connection structures, preparation methods, materials, structures, or composition ratios, that are not explicitly described in this technical solution are considered to be common technical features disclosed in the prior art.
[0029] Example 1
[0030] This embodiment provides a notch structure for quickly replacing a concrete beam expansion device, such as Figure 1 As shown, it includes an L-shaped steel structure 1, anchoring area concrete, embedded steel bars, and embedded connectors 5. The L-shaped steel structure 1 fits in the notch, and the telescopic device 8 is welded to the notch with its own connecting steel bars or mounting bolts. The form of the telescopic device 8 is not limited.
[0031] The embedded steel bars include beam body embedded steel bars 4 and notch embedded steel bars 6. The beam body embedded steel bars 4 are fixedly connected to the embedded connectors 5 and fixed in the concrete beam 9 below the notch of the expansion device. The notch embedded steel bars 6 are fixed in the notch to strengthen the connection between the expansion device 8 and the concrete 3 in the anchoring area; the embedded connectors 5 are embedded in the concrete beam 9, and the upper ends are welded to the L-shaped steel structure 1 in the notch. The embedded connectors 5 are in the shape of barbed hooks, and the beam body embedded steel bars 4 are arranged in the barbs of the embedded connectors 5. According to the height and width of the notch, and by utilizing the steel bars in the appropriate position in the concrete beam 9, there is no need to set up additional transverse embedded steel bars. The embedded connectors 5 are steel bars or anchor bolts. The expansion devices of large and complex bridges require anchor bolt connections, while conventional bridges use steel bars.
[0032] An L-shaped steel structure 1 is installed at the edge of the expansion joint slot. Several weld studs 2 are welded to the horizontal plate of the L-shaped steel structure 1 to strengthen the connection between the anchorage concrete 3 and the L-shaped steel structure 1. The weld studs 2 have a size of D13 x 80 mm. The L-shaped steel structure 1 is made of stainless steel or ordinary steel with an anti-corrosion coating. This coating can be a combination of epoxy zinc-rich primer, epoxy (high-build) intermediate paint, and acrylic aliphatic polyurethane topcoat. Alternatively, an anti-corrosion coating solution can be used depending on the environmental category and relevant regulatory requirements. Casting holes 7 are also provided on the horizontal plate of the L-shaped steel structure 1 to facilitate vibrating and compacting the concrete within the concrete beam 9 below the slot. The size and number of the casting holes 7 are determined by the size of the expansion joint slot. The L-shaped steel structure 1 is formed by welding custom steel sections or ordinary steel plates. The beam body includes embedded rebar 4, embedded connectors 5, the L-shaped steel structure 1, and the concrete beam 9, forming an integrated structure.
[0033] The groove is filled with concrete to form anchoring area concrete 3, and the concrete is steel fiber concrete.
[0034] like Figure 1 As shown, in this embodiment, the total pavement thickness H0 of the asphalt and concrete leveling layers adopts the conventional thickness of 180mm, and the expansion joint width C is 160mm. In this embodiment, a comb plate expansion joint is used, and the slot depth H1 is 250mm. One side of the expansion device slot is fixed, and the other side is movable. The fixed side slot width B1 is 500mm, and the movable side slot width B2 is 660mm. The slot embedded steel bars 6 are HRB400 steel bars with a diameter of 16mm. The slot embedded steel bars 6 arranged along the bridge direction are welded to the L-shaped steel structure in the slot; the embedded parts 5 in the beam body are HRB400 steel bars with a diameter of 16mm, and the beam body embedded steel bars 4 utilize the transverse steel bars in the beam body. The L-shaped steel structure 1 is Q235 with a plate thickness of 10mm.
[0035] The above description of the embodiments is intended to facilitate understanding and use of the utility model by those skilled in the art. Those skilled in the art will readily be able to make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, the utility model is not limited to the above-described embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of this utility model without departing from the scope of this utility model should be within the scope of protection of this utility model.
Claims
1. A notch structure for quickly replacing a concrete beam expansion device, characterized in that: It includes an L-shaped steel structure (1), anchoring area concrete, embedded steel bars and embedded connectors (5); The L-shaped steel structure is fitted into the notch, and the L-shaped steel structure (1) is provided with welding nails (2), and the welding nails (2) are used to strengthen the connection between the anchoring area concrete (3) and the L-shaped steel structure (1) in the notch; The embedded steel bars include beam body embedded steel bars (4) and notch embedded steel bars (6), the beam body embedded steel bars (4) are fixedly connected to the embedded connector (5), and the notch embedded steel bars (6) are fixed in the anchoring area concrete (3) to strengthen the connection between the expansion and contraction device (8) and the anchoring area concrete (3); The embedded connector (5) is embedded in the concrete beam (9), and the upper end is fixedly connected to the L-shaped steel structure (1) in the notch.
2. A notch structure for quickly replacing a concrete beam expansion device according to claim 1, characterized in that: The embedded connecting piece (5) is in the shape of a barb, and the beam body embedded steel bars (4) are arranged in the barb of the embedded connecting piece (5) and are fixedly connected to the embedded connecting piece (5).
3. The notch structure for quickly replacing a concrete beam expansion device according to claim 1, characterized in that: The embedded connecting piece (5) is a steel bar or an anchor bolt.
4. The notch structure for quickly replacing a concrete beam expansion device according to claim 1, characterized in that: The L-shaped steel structure (1) is formed by welding customized steel or ordinary steel plates.
5. The notch structure for quickly replacing a concrete beam expansion device according to claim 1, characterized in that: A plurality of welding nails (2) are provided, and the plurality of welding nails (2) are all welded to the horizontal plate of the L-shaped steel structure (1).
6. The notch structure for quickly replacing a concrete beam expansion device according to claim 1, characterized in that: The L-shaped steel structure (1) is made of stainless steel or ordinary steel with an anti-corrosion coating.
7. The notch structure for quickly replacing a concrete beam expansion device according to claim 1, characterized in that: The beam body embedded steel bars (4) are fixed in the concrete beam (9) below the notch.
8. The notch structure for quickly replacing a concrete beam expansion device according to claim 1, characterized in that: A pouring hole (7) is provided on the horizontal surface of the L-shaped steel structure (1) to facilitate the vibration and compaction of the concrete in the concrete beam (9) below the notch.
9. The notch structure for quickly replacing a concrete beam expansion device according to claim 1, characterized in that: The beam body embedded steel bars (4), embedded connectors (5), L-shaped steel structure (1) and concrete beam (9) form an integrated structure.
10. The notch structure for quickly replacing a concrete beam expansion device according to claim 1, characterized in that: The groove is filled with concrete to form anchoring area concrete (3), and the concrete is steel fiber concrete.