A concrete box girder flange plate welded reinforcing structure

Abstract

The utility model discloses a kind of concrete box girder flange plate welding reinforcing steel bar reinforcing structures, belong to reinforcing technical field, including old bridge concrete box girder flange plate, the old bridge concrete box girder flange plate top is equipped with construction surface;Multiple notches are equipped on the construction surface, old bridge box girder transverse reinforcement and old bridge box girder longitudinal reinforcement are equipped in the notch;Newly-added reinforcement net is equipped on the construction surface, and the newly-added reinforcement net is located between expansion joint concrete and old bridge asphalt pavement layer, and the newly-added reinforcement net includes newly-added transverse reinforcement and newly-added longitudinal reinforcement, and the newly-added transverse reinforcement is connected with old bridge box girder transverse reinforcement by newly-added slot-shaped reinforcement, C50 waterproof concrete layer and BPA-10 thin layer asphalt pavement layer are sequentially equipped above the newly-added reinforcement net and construction surface, the utility model discloses a kind of reinforcing structure capable of realizing reliable connection of new and old structures, effectively improve bending bearing capacity.

Description

Technical Field

[0001] This utility model relates to the field of reinforcement technology, and in particular to a reinforced structure for welded steel bars on the flange plate of a concrete box girder. Background Technology

[0002] During the widening and reconstruction of the old bridge, the lateral stress state of the bridge changed, resulting in insufficient lateral bending capacity of the flange plate of the old bridge's concrete box girder, which could not meet the safety requirements. Traditional reinforcement methods often suffer from problems such as weak connection between the old and new structures and poor overall load-bearing performance. Therefore, a reinforcement structure that can reliably connect the old and new structures and effectively improve the bending capacity is needed. Utility Model Content

[0003] In order to overcome the shortcomings of the existing technology, the technical problem to be solved by this utility model is to propose a reinforcement structure that can achieve a reliable connection between the old and new structures and effectively improve the bending load-bearing capacity.

[0004] To achieve this objective, the present invention adopts the following technical solution: This utility model provides a reinforced structure for welded steel reinforcement of a concrete box girder flange, including a flange of an old bridge concrete box girder. The flange of the old bridge concrete box girder flange has a construction surface on its top. The construction surface has multiple slots, and the slots contain transverse steel bars and longitudinal steel bars of the old bridge box girder. The construction surface has an additional steel mesh, which is located between the expansion joint concrete and the old bridge asphalt pavement layer. The newly added steel mesh includes newly added transverse steel bars and newly added longitudinal steel bars. The newly added transverse steel bars are connected to the transverse steel bars of the old bridge box girder through newly added channel steel bars. A C50 waterproof concrete layer and a BPA-10 thin asphalt pavement layer are sequentially provided above the newly added steel mesh and the construction surface.

[0005] The preferred technical solution of this utility model is that the longitudinal bridge length of the slot is 15cm, the transverse bridge length is 3cm, and the depth is 3cm.

[0006] The preferred technical solution of this utility model is that the newly added transverse steel bars are HRB400 steel bars with a diameter of 16mm, and are arranged at 10cm intervals in the transverse direction; the newly added longitudinal steel bars are HRB400 steel bars with a diameter of 10mm, and are arranged at 10cm intervals in the longitudinal direction.

[0007] The preferred technical solution of this utility model is that the two sides of the newly added channel steel bar are connected to the newly added transverse steel bar and the transverse steel bar of the old bridge box girder by double-sided welding.

[0008] The preferred technical solution of this utility model is that the C50 waterproof concrete layer has a thickness of 6cm and a seepage prevention grade of P6.

[0009] The preferred technical solution of this utility model is that the thickness of the BPA-10 thin-layer asphalt pavement is 2cm, and a high-viscosity modified emulsified asphalt tack coat is provided underneath.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model strengthens the bridge by welding the newly added transverse steel bars to the transverse steel bars of the old bridge box girder with the newly added channel steel bars. This creates an integrated load-bearing system between the new steel mesh and the original steel bars of the old bridge. The new steel mesh can share the vertical load borne by the flange of the old bridge concrete box girder, achieving efficient reinforcement of the flange of the old bridge box girder, significantly improving the load-bearing capacity of the flange of the old bridge concrete box girder, and reducing the risk of cracking caused by load concentration. At the same time, the combined design of the C50 waterproof concrete layer and the BPA-10 thin-layer asphalt pavement layer can effectively block water penetration, reduce the risk of steel corrosion, and extend the service life of the structure. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the old bridge box girder flange reinforcement structure provided in a specific embodiment of this utility model; Figure 2 This is provided in a specific embodiment of the present utility model. Figure 1 Enlarged schematic diagram of the structure at point A in the middle; Figure 3 This is a schematic diagram of the grooved structure of the flange plate of an old bridge box girder provided in a specific embodiment of this utility model.

[0012] The attached diagram lists the components represented by each number as follows: 1. Flange plate of old bridge concrete box girder; 11. Groove; 12. Transverse reinforcement of old bridge box girder; 13. Longitudinal reinforcement of old bridge box girder; 2. New steel mesh; 21. New transverse reinforcement; 22. New longitudinal reinforcement; 3. New grooved reinforcement; 4. C50 waterproof concrete layer; 5. BPA-10 thin asphalt pavement layer; 6. Expansion joint concrete; 7. Asphalt pavement layer of old bridge; 8. Double-sided welding. Detailed Implementation

[0013] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0014] A reinforced concrete box girder flange plate welded steel reinforcement structure includes an old bridge concrete box girder flange plate 1, the top of which has a construction surface; the construction surface has multiple slots 11, and the slots 11 contain transverse steel bars 12 and longitudinal steel bars 13 of the old bridge box girder; a new steel mesh 2 is provided on the construction surface, the new steel mesh 2 being located between the expansion joint concrete 6 and the old bridge asphalt pavement layer 7. The newly added steel mesh 2 includes newly added transverse steel bars 21 and newly added longitudinal steel bars 22. The newly added transverse steel bars 21 are connected to the transverse steel bars 12 of the old bridge box girder through newly added channel steel bars 3. The two sides of the newly added channel steel bars 3 are connected to the newly added transverse steel bars 21 and the transverse steel bars 12 of the old bridge box girder by double-sided welding 8. A C50 waterproof concrete layer 4 and a BPA-10 thin asphalt pavement layer 5 are sequentially provided on the newly added steel mesh 2 and the construction surface.

[0015] First, a slot 11 is made on the construction surface of the flange plate 1 of the old bridge concrete box girder to expose the transverse reinforcement 12 and longitudinal reinforcement 13 of the old bridge box girder, providing a load-bearing foundation for the connection between the old and new reinforcements. Then, new transverse reinforcement 21 is welded to the transverse reinforcement 12 of the old bridge box girder using newly added channel-shaped reinforcement 3, forming an integrated load-bearing system with the original reinforcement of the old bridge. The new reinforcement mesh 2 can share the vertical load and horizontal shear force borne by the flange plate 1 of the old bridge concrete box girder. The new reinforcement mesh 2 is placed between the expansion joint concrete 6 and the old bridge asphalt pavement layer 7, and can directly... To bear the load transferred by the pavement layer and reduce the impact of the load on the original structure of the old bridge, C50 waterproof concrete layer 4 and BPA-10 thin asphalt pavement layer 5 are laid sequentially on the newly added steel mesh 2 and the construction surface. C50 waterproof concrete layer 4 provides a protective layer for the steel mesh and enhances the structural stiffness of the old bridge concrete box girder flange 1. BPA-10 thin asphalt pavement layer 5 serves as the surface load-bearing layer and protective layer, working together with the underlying structure to resist the impact of vehicle loads. At the same time, through the complementary properties of the layered materials, the structural bearing capacity and durability are both improved.

[0016] As a possible implementation of this solution, preferably, the slot 11 is 15cm long in the longitudinal direction, 3cm long in the transverse direction, and 3cm deep. The 15cm length in the longitudinal direction ensures that the transverse steel bars 12 of the old bridge box girder are fully exposed in the slot 11, avoiding the inability to connect due to the spacing error of the steel bars. The 3cm length and 3cm depth in the transverse direction only peel off the surface concrete, without damaging the core stress area of ​​the flange plate 1 of the old bridge concrete box girder, reducing damage to the original structure. The 3cm depth allows the exposed length of the transverse steel bars 12 of the old bridge box girder to meet the welding requirements, while reducing the construction difficulty and improving the excavation efficiency of the slot 11.

[0017] As a possible implementation of this solution, preferably, the newly added transverse reinforcement 21 is made of HRB400 steel with a diameter of 16mm, and is arranged at 10cm intervals in the transverse direction; the newly added longitudinal reinforcement 22 is made of HRB400 steel with a diameter of 10mm, and is arranged at 10cm intervals in the longitudinal direction.

[0018] The newly added transverse steel bars 21 with a diameter of 16mm are made of HRB400 high-strength material and can withstand the main shear force in the transverse direction of the bridge. With a spacing of 10cm, they can evenly distribute the load and avoid the yielding of steel bars caused by local stress concentration. The newly added longitudinal steel bars 22 with a diameter of 10mm and a spacing of 10cm can enhance the integrity of the new steel mesh 2 and form a grid structure with the transverse steel bars 12 of the old bridge box girder. This enhances the restraint effect on the C50 waterproof concrete layer 4 and reduces the risk of concrete cracking. The specifications and spacing of the two types of steel bars are matched with the load characteristics of the old bridge flange plate. While ensuring the reinforcement strength, it avoids the increase in structural self-weight caused by excessive steel bar usage.

[0019] As a possible implementation of this solution, preferably, the C50 waterproof concrete layer 4 is 6cm thick and has a seepage prevention grade of P6. The C50 concrete strength grade can meet the load-bearing requirements of the structural layer. The 6cm thickness can completely cover the newly added steel mesh 2 and enhance the overall rigidity of the old bridge concrete box girder flange 1. The P6 seepage prevention grade can effectively prevent rainwater and bridge deck seepage from penetrating into the steel mesh area and avoid steel corrosion. The 6cm thickness is compatible with the construction surface of the old bridge flange slab, and there is no need to carry out large-scale demolition of the original structure. The increase in structural height after construction is reasonable and does not affect the bridge deck clearance.

[0020] As a possible implementation of this solution, preferably, the BPA-10 thin-layer asphalt pavement layer 5 is 2cm thick, and a high-viscosity modified emulsified asphalt tack coat is provided underneath. The 2cm thin layer design can reduce the self-weight of the pavement layer and reduce the additional load on the flange plate 1 of the old bridge concrete box girder. At the same time, the BPA-10 asphalt material has good anti-rutting performance and can adapt to repeated vehicle rolling. The high-viscosity modified emulsified asphalt tack coat can enhance the adhesion between the asphalt pavement layer and the underlying C50 waterproof concrete layer 4, avoid interlayer slippage, and ensure the uniform transfer of load from the pavement layer to the concrete layer.

[0021] This utility model has been described through preferred embodiments. Those skilled in the art will understand that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. This utility model is not limited to the specific embodiments disclosed herein; other embodiments falling within the scope of the claims of this application are all within the protection scope of this utility model.

Claims

1. A reinforced structure for welded steel bars on the flange plate of a concrete box girder, characterized in that: The structure includes a flange plate (1) of a concrete box girder from an old bridge, with a construction surface at the top of the flange plate (1); multiple slots (11) are provided on the construction surface, and transverse reinforcing bars (12) and longitudinal reinforcing bars (13) of the old bridge box girder are provided in the slots (11); a new steel mesh (2) is provided on the construction surface, and the new steel mesh (2) is located between the expansion joint concrete (6) and the asphalt pavement layer (7) of the old bridge. The newly added steel mesh (2) includes newly added transverse steel bars (21) and newly added longitudinal steel bars (22). The newly added transverse steel bars (21) are connected to the transverse steel bars (12) of the old bridge box girder through newly added channel steel bars (3). The newly added steel mesh (2) and the construction surface are provided with a C50 waterproof concrete layer (4) and a BPA-10 thin asphalt pavement layer (5) in sequence.

2. The reinforced concrete box girder flange plate welded steel reinforcement structure according to claim 1, characterized in that: The slot (11) is 15cm long in the longitudinal direction, 3cm long in the transverse direction, and 3cm deep.

3. The reinforced concrete box girder flange plate welded steel reinforcement structure according to claim 1, characterized in that: The newly added transverse reinforcement (21) is made of HRB400 steel with a diameter of 16mm, and is arranged at 10cm intervals in the transverse direction; the newly added longitudinal reinforcement (22) is made of HRB400 steel with a diameter of 10mm, and is arranged at 10cm intervals in the longitudinal direction.

4. The reinforced structure for welded steel bars on the flange plate of a concrete box girder according to claim 1, characterized in that: The newly added channel steel bar (3) is connected to the newly added transverse steel bar (21) and the transverse steel bar (12) of the old bridge box girder by double-sided welding (8).

5. The reinforced structure for welded steel reinforcement of the flange plate of a concrete box girder according to claim 1, characterized in that: The C50 waterproof concrete layer (4) is 6cm thick and has a seepage prevention grade of P6.

6. The reinforced concrete box girder flange plate welded steel reinforcement structure according to claim 1, characterized in that: The BPA-10 thin asphalt pavement layer (5) is 2cm thick and has a high-viscosity modified emulsified asphalt tack coat underneath.

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