Under-bridge reinforcing structure for improving overall stress performance of existing hollow slab

Abstract

The utility model relates to the technical field of bridge maintenance, in particular to an under-bridge reinforcing structure for improving the overall stress performance of existing hollow slabs, which comprises a composite fiber grid arranged at the bottoms of the hollow slabs and used for connecting the hollow slabs into a whole. The fixing assemblies are used for fixing the composite fiber grids to the bottoms of the hollow slabs, and the grid bonding layers are used for wrapping the fixing assemblies and the composite fiber grids and bonding the fixing assemblies and the composite fiber grids to the bottoms of the hollow slabs. After the composite fiber grids are fixed to the bottoms of the hollow slabs, the composite fiber grids, the fixing assemblies and the hollow slabs form an integrated structure through the grid bonding layers, the integrated structure can be mutually restrained in the longitudinal direction and the transverse direction, and therefore the effect of bidirectional joint stress is achieved; the existing hollow slab is reinforced to form an integral slab stress mode under the action of an automobile load, and the integral stress performance and durability of the hollow slab are greatly improved.

Description

[Technical Field]

[0001] This utility model relates to the field of bridge maintenance technology, specifically to a bridge under-bridge reinforcement structure for improving the overall load-bearing performance of existing hollow slabs. [Background Technology]

[0002] Hollow slab bridges have been widely used in highway bridge construction due to their advantages such as lightweight structure, ease of prefabrication and assembly, and adaptability to standardized construction processes. However, with the growth of highway traffic demand, such as increased traffic volume, higher load levels, and frequent heavy vehicle traffic, hollow slab bridges experience problems after long-term operation, including hinge joint fractures, failure of lateral connections in the hollow slabs, and poor overall load-bearing capacity. This seriously threatens traffic safety and the service life of the bridge.

[0003] For the repair and reinforcement of hollow slab bridges with poor overall load-bearing performance, current methods are mainly divided into two categories: durability remediation and load-bearing capacity reinforcement. Durability remediation measures, such as chemical grouting of hinge joints, while having minimal impact on traffic and a fast construction speed, are not suitable for bridges with severe hinge joint defects. Common methods for load-bearing capacity reinforcement include bridge deck reinforcement, steel plate bonding reinforcement, external prestressing reinforcement, adding transverse connections, and shear reinforcement. Existing reinforcement technologies each have their own characteristics and limitations, and their effects on improving defects overlap to some extent. In particular, some reinforcement technologies have long construction cycles and complex processes, and some reinforcement structures are large in size, affecting the clearance under the bridge. In addition, traffic interruption on the bridge is unavoidable during reinforcement construction, resulting in adverse effects.

[0004] In view of the above-mentioned technical problems, this utility model is proposed in this study. [Utility Model Content]

[0005] The technical problem this utility model aims to solve is to provide a bridge under-bridge reinforcement structure for improving the overall load-bearing performance of existing hollow slabs. Construction is carried out under the bridge, resolving traffic disruption issues. Simultaneously, a composite fiber mesh is fixed to the bottom of the hollow slab using fixing components, and several hollow slabs are connected into a single unit via the composite fiber mesh. A mesh bonding layer then integrates the composite fiber mesh, fixing components, and several hollow slabs into a single structure. This construction method is simple and efficient, solving the problems of long construction cycles, complex processes, and large reinforced structures affecting the clearance under the bridge associated with existing reinforcement technologies. The bridge under-bridge reinforcement structure of this application allows for longitudinal and lateral mutual constraint, achieving a bidirectional joint load-bearing effect. This enables the reinforcement of existing hollow slabs to form a unified slab load-bearing mode under vehicle loads, significantly improving the overall load-bearing performance and durability of the hollow slabs.

[0006] To address the aforementioned technical problems, this utility model proposes an under-bridge reinforcement structure for improving the overall load-bearing performance of existing hollow slabs. The existing hollow slabs consist of several pieces arranged side by side. The under-bridge reinforcement structure includes a composite fiber mesh disposed at the bottom of the hollow slabs for connecting the several hollow slabs into a single unit, and several fixing components for fixing the composite fiber mesh to the bottom of the hollow slabs. The under-bridge reinforcement structure also includes a mesh bonding layer for wrapping and bonding the fixing components and the composite fiber mesh to the bottom of the hollow slabs.

[0007] As described above, a bridge under-bridge reinforcement structure for improving the overall load-bearing performance of existing hollow slabs has a gap between the composite fiber mesh and the bottom of the hollow slab.

[0008] The bridge under-bridge reinforcement structure described above, used to improve the overall load-bearing performance of existing hollow slabs, has a mesh bonding layer thickness of 3-5 cm.

[0009] As described above, a bridge under-bridge reinforcement structure for improving the overall load-bearing performance of existing hollow slabs includes a composite fiber mesh, which is a rigid mesh structure formed by several longitudinal and several transverse composite fiber strips.

[0010] As described above, a bridge under-bridge reinforcement structure for improving the overall load-bearing performance of existing hollow slabs includes a fixing component that engages with a composite fiber mesh and a fixing component for fixing the fixing component to the bottom of the hollow slab.

[0011] As described above, a bridge under-bridge reinforcement structure for improving the overall load-bearing performance of existing hollow slabs includes a fastener located at the node of the composite fiber mesh.

[0012] As described above, a bridge under-bridge reinforcement structure for improving the overall load-bearing performance of existing hollow slabs has a buckle in the shape of a cuboid, with a first groove formed on one side to engage with a longitudinal composite fiber strip, and a second groove formed on the other side adjacent to the first groove to engage with a transverse composite fiber strip.

[0013] As described above, a bridge under-bridge reinforcement structure for improving the overall load-bearing performance of existing hollow slabs includes a hinge joint between adjacent hollow slabs. The bridge under-bridge reinforcement structure also includes a hinge joint bonding layer disposed at the hinge joint for bonding adjacent hollow slabs.

[0014] Compared with existing technologies, the bridge under-bridge reinforcement structure of this utility model for improving the overall load-bearing performance of existing hollow slabs has the following advantages:

[0015] 1. In this application, after the composite fiber mesh is fixed to the bottom of the hollow board, the composite fiber mesh, the fixing components and several hollow boards are integrated into a structure through the mesh bonding layer. The structure can be constrained in the longitudinal and transverse directions, thereby achieving the effect of bidirectional joint force. This realizes the reinforcement of the existing hollow board to form an overall board force mode under the action of automobile load, which greatly improves the overall force performance and durability of the hollow board.

[0016] 2. By setting a hinge joint bonding layer at the hinge joint, this application can further improve the connection strength between adjacent hollow slabs, effectively improve the shear force transmission between each hollow slab, enhance the lateral connection capacity between hollow slabs, and realize the coordinated force bearing of each hollow slab.

[0017] 3. The construction work for this application is carried out under the bridge, which will not interfere with traffic on the bridge surface and can minimize the management pressure on bridge maintenance units and transportation departments. In addition, the thickness of the reinforcement structure under the bridge in this application is 3-5cm, which generally does not affect the clearance under the bridge. [Attached Image Description]

[0018] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein:

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] Figure 2 This is another structural schematic diagram of the present invention.

[0021] Figure 3 This is a schematic diagram of the composite fiber mesh structure in this utility model.

[0022] Figure 4 yes Figure 3 A schematic diagram of the structure at point A in the middle.

[0023] Figure 5 This is a structural schematic diagram of the fixing component in this utility model.

[0024] Figure 6 This is another structural schematic diagram of the composite fiber mesh in this utility model.

[0025] In the figure: 1. Hollow core plate; 2. Composite fiber mesh; 20. Composite fiber strip; 3. Fixing component; 30. Fastener; 31. Fixing component; 32. First slot; 33. Second slot; 4. Mesh bonding layer; 5. Hinge joint; 6. Hinge joint bonding layer.

Detailed Implementation Methods

[0026] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0027] like Figure 1-6As shown, this utility model includes a bridge under-bridge reinforcement structure for improving the overall load-bearing performance of existing hollow slabs. The existing hollow slab 1 comprises several slabs arranged side-by-side. The under-bridge reinforcement structure includes a composite fiber mesh 2 located at the bottom of the hollow slab 1 to connect the several hollow slabs 1 into a single unit, and several fixing components 3 for fixing the composite fiber mesh 2 to the bottom of the hollow slab 1. The under-bridge reinforcement structure also includes a mesh bonding layer 4 for wrapping and bonding the fixing components 3 and the composite fiber mesh 2 to the bottom of the hollow slab 1. In this embodiment, the mesh bonding layer 4 is formed by the solidification of high-performance polymer mortar. The composite fiber mesh 2 is a rigid mesh structure formed by several longitudinal and several transverse composite fiber strips 20, which are impregnated with and cured with polymer resin. The mesh size is a square structure of 10cm × 10cm, and its size can be adjusted as needed. When reinforcing the hollow slab 1, the composite fiber mesh 2 is fixed to the bottom of the hollow slab 1 by the fixing component 3, and several hollow slabs 1 are connected into one piece by the composite fiber mesh 2. Then, the composite fiber mesh 2 and the fixing component 3 are wrapped around the bottom of the bridge by spraying high-performance polymer mortar. After the high-performance polymer mortar solidifies, it forms a whole with the composite fiber mesh 2 and the fixing component 3, thereby reinforcing the bottom of the hollow slab 1.

[0028] Adjacent hollow slabs 1 are connected by hinge joints 5. The bridge under-bridge reinforcement structure also includes a hinge joint bonding layer 6 disposed at the hinge joints 5 to bond adjacent hollow slabs 1 together. By providing the hinge joint bonding layer 6 at the hinge joints 5, the connection strength between adjacent hollow slabs 1 can be further improved, effectively enhancing the shear force transmission between each hollow slab 1, strengthening the lateral connection capacity between hollow slabs 1, and realizing the coordinated stress distribution of each hollow slab 1. In this embodiment, the hinge joint bonding layer 6 is formed by the curing of adhesive.

[0029] In addition, in this embodiment, the high-performance polymer mortar is prepared by using polymer, cement, fine aggregate and additives as the main raw materials in appropriate proportions. It has the characteristics of easy pumping, easy atomization and easy thixotropy, with a 28-day shrinkage rate ≤0.1%; 28-day compressive strength ≥50 MPa; 28-day flexural strength ≥10 MPa; 28-day tensile bond strength ≥2 MPa; and 28-day shear bond strength ≥3.5 MPa. A composite fiber mesh 2 is wrapped around the bottom of several horizontally arranged hollow slabs 1 by spraying to form a mesh bonding layer 4.

[0030] In this embodiment, the construction work is carried out under the bridge, which will not interfere with traffic on the bridge surface and can reduce the management pressure on the bridge maintenance unit and the transportation department to the greatest extent.

[0031] In this embodiment, after the composite fiber mesh 2 is fixed to the bottom of the hollow plate 1, the composite fiber mesh, the fixing component 3 and several hollow plates 1 are integrated into a structure through the mesh bonding layer 4. They can constrain each other in the longitudinal and transverse directions, thereby achieving the effect of bidirectional joint force. This realizes the reinforcement of the existing hollow plate 1 to form an overall plate force mode under the action of automobile load, which greatly improves the overall force performance and durability of the hollow plate 1.

[0032] As a further embodiment, the composite fiber mesh 2 has a gap with the bottom of the hollow slab 1. In this embodiment, the gap is 0.5 cm to 1.5 cm, preferably 1 cm. By setting the gap, the high-performance polymer mortar can completely wrap the composite fiber mesh 2, and the high-performance polymer mortar can fully contact the bottom of the hollow slab 1, thereby making the connection between the entire bridge under-bridge reinforcement structure and the bottom of the hollow slab 1 more stable.

[0033] As a further embodiment, the thickness of the mesh bonding layer 4 is 3-5 cm. Through actual construction verification, the inventors found that the thickness of the mesh bonding layer 4 is 3-5 cm, preferably 4 cm. This narrow thickness can wrap the fixing component 3 and the composite fiber mesh 2, forming a whole load-bearing structure with the existing hollow slab 1. The thickness of 3-5 cm will not affect the clearance under the bridge.

[0034] like Figures 4 to 6 As shown, as a further embodiment, the fixing component 3 includes a snap-fit ​​member 30 that engages with the composite fiber mesh 2 and a fixing member 31 for fixing the snap-fit ​​member 30 to the bottom of the hollow slab 1. The snap-fit ​​member 30 is located at the node of the composite fiber mesh 2. The snap-fit ​​member 30 is cuboid in shape, with a first groove 32 formed on one side to engage with the longitudinal composite fiber strip 20, and a second groove 33 formed on the other side adjacent to the first groove 32 to engage with the transverse composite fiber strip 20. The snap-fit ​​member 30 is connected to the composite fiber mesh 2 by snap-fit, which can achieve quick installation. The fixing member 31 can be an expansion bolt, rivet, or metal nail, eliminating the need for large-area drilling and preventing damage to the original structure of the hollow slab 1. By placing the snap-fit ​​member 30 at the node of the composite fiber mesh 2, mutual constraint in the longitudinal and transverse directions can be achieved, thereby achieving bidirectional joint force and simultaneous bidirectional reinforcement. Furthermore, after the first slot 32 and the second slot 33 of the fastener 30 cooperate, it can be inserted into a corner of the mesh of the composite fiber mesh 2, and simultaneously onto the horizontal and vertical composite fiber strips 20. It should also be noted that when using the fastener 30 to fasten the composite fiber mesh 2, the installation directions of adjacent fasteners 30 must be staggered to prevent the composite fiber mesh 2 from slipping and causing the entire composite fiber mesh 2 to detach.

[0035] In this embodiment, the bottom of the hollow slab 1 is reinforced by the following steps:

[0036] S1. Surface preparation: Clean and polish the debris and loose layer on the bottom of the hollow board 1 and the surface of the glue joint to make the interface fresh and rough.

[0037] S2. Repair of hinge joint 5: Use adhesive to fill and repair the damaged hinge joint 5.

[0038] S3. Installation of composite fiber mesh 2: Use fixing component 3 to fix composite fiber mesh 2 to the bottom of hollow plate 1.

[0039] S4. High-performance mortar construction: An interface agent is sprayed onto the bridge underside and composite fiber mesh 2. Then, high-performance polymer mortar is sprayed in sections and layers using a wet spraying method. After the first layer of high-performance polymer mortar has initially set, the second layer is sprayed immediately. After the second layer is completed, a finishing process is performed to ensure a smooth surface. This step utilizes a wet spraying method for section and layer construction, which is simple, fast, and has a short cycle. The construction is carried out under the bridge, minimizing disruption to traffic on the bridge surface and reducing the management burden on bridge maintenance units and transportation departments.

[0040] S5. Maintenance and management: Moisturize and maintain the polymer mortar after it has set.

Claims

1. A bridge under-bridge reinforcement structure for improving the overall load-bearing performance of existing hollow slabs, wherein the existing hollow slabs (1) are a plurality of slabs arranged side by side, characterized in that... The bridge under-bridge reinforcement structure includes a composite fiber mesh (2) located at the bottom of the hollow slab (1) for connecting several hollow slabs (1) into one piece, and several fixing components (3) for fixing the composite fiber mesh (2) to the bottom of the hollow slab (1). The bridge under-bridge reinforcement structure also includes a mesh bonding layer (4) for wrapping and bonding the fixing components (3) and the composite fiber mesh (2) to the bottom of the hollow slab (1).

2. The bridge under-bridge reinforcement structure for improving the overall load-bearing performance of existing hollow slabs according to claim 1, characterized in that... There is a gap between the composite fiber mesh (2) and the bottom of the hollow plate (1).

3. A bridge under-bridge reinforcement structure for improving the overall load-bearing performance of existing hollow slabs according to claim 1, characterized in that... The thickness of the mesh bonding layer (4) is 3-5cm.

4. A bridge under-bridge reinforcement structure for improving the overall load-bearing performance of existing hollow slabs according to claim 1, characterized in that... The composite fiber mesh (2) is a rigid mesh structure formed by several longitudinal and several transverse composite fiber strips (20).

5. A bridge under-bridge reinforcement structure for improving the overall load-bearing performance of existing hollow slabs according to claim 4, characterized in that... The fixing component (3) includes a snap fastener (30) that engages with the composite fiber mesh (2) and a fastener (31) for fixing the snap fastener (30) to the bottom of the hollow plate (1).

6. A bridge under-bridge reinforcement structure for improving the overall load-bearing performance of existing hollow slabs according to claim 5, characterized in that... The fastener (30) is located at the node of the composite fiber mesh (2).

7. A bridge under-bridge reinforcement structure for improving the overall load-bearing performance of existing hollow slabs according to claim 5, characterized in that... The fastener (30) is rectangular, and one side is formed with a first groove (32) that engages with the longitudinal composite fiber strip (20), and the other side adjacent to the first groove (32) is formed with a second groove (33) that engages with the transverse composite fiber strip (20).

8. A bridge under-bridge reinforcement structure for improving the overall load-bearing performance of existing hollow slabs according to claim 5, characterized in that... There is a hinge joint (5) between adjacent hollow slabs (1), and the bridge under-bridge reinforcement structure also includes a hinge joint bonding layer (6) located at the hinge joint (5) for bonding adjacent hollow slabs (1).

Images