Bridge hollow slab beam reinforcing structure

Abstract

The utility model provides a kind of bridge hollow slab beam reinforcing structure, including hollow slab beam, cable, baffle, fastener and reinforcing frame, the both ends of the hollow slab beam are attached with baffle, wherein hollow slab beam and baffle inside sliding pass through several cables, the extension direction of this cable is same with the extension direction of the central axis of hollow slab beam;The both ends of the cable are fixed with corresponding baffle by fastener;The lower side of the hollow slab beam is fixed with reinforcing frame.The utility model is set, by cable, can exert a prestress opposite to the bending moment caused by external load (such as vehicle, dead weight) to hollow slab beam, to further offset the deflection deformation of hollow slab beam, improve stiffness and crack resistance, second, by the setting of reinforcing frame, the anti-seismic and impact resistance of hollow slab beam can be improved.

Description

Technical Field

[0001] This utility model belongs to the field of hollow slab beam reinforcement technology, and particularly relates to a bridge hollow slab beam reinforcement structure. Background Technology

[0002] Hollow slab beams are core load-bearing components widely used in highway and municipal bridges, and are a typical type of precast concrete beam. Their structural feature is that the beam body is designed to be hollow. Compared to solid beams, this significantly reduces the amount of concrete used (typically by 30%-50%) while maintaining basic load-bearing capacity, thus reducing the self-weight of the bridge superstructure and consequently reducing the load pressure on the lower piers and abutments.

[0003] Currently, the structural design of traditional hollow slab beams for bridges is relatively simple. Their load-bearing capacity mainly relies on the internal steel cage (i.e., steel skeleton), without additional active reinforcement or energy dissipation components. The steel cage uses hot-rolled ribbed steel bars or threaded steel bars, which are woven into longitudinal reinforcing bars, transverse distribution bars and stirrups according to the design spacing to form a three-dimensional steel cage frame. The longitudinal reinforcing bars mainly bear the tensile force in the mid-span area of ​​the beam, while the stirrups are used to resist shear force and prevent the beam from developing diagonal cracks.

[0004] However, traditional hollow slab girders for bridges have the following drawbacks in practical use: First, the existing structure relies solely on the steel cage to passively bear the tensile force, failing to actively counteract the tensile stress generated by external loads. When the bridge is subjected to vehicle impacts or long-term loads, transverse cracks are prone to appear in the tension zone at the mid-span, and these cracks gradually expand over time, leading to a decrease in beam stiffness and subsequent significant downward deflection, affecting the smoothness of bridge traffic. Second, the existing structure is a rigid load-bearing system lacking dedicated energy-dissipating components. When encountering sudden loads (such as emergency braking of heavy vehicles or earthquakes), the load energy is directly borne by the steel cage and concrete, unable to be dissipated through effective means, easily leading to localized stress concentration and causing damage such as steel cage yielding and concrete crushing.

[0005] Therefore, the existing hollow slab beam structure of bridges that relies solely on steel cages can no longer adapt to the increasingly complex usage environment and safety requirements. There is an urgent need for a reinforcement scheme that combines active reinforcement and energy dissipation functions to solve the above-mentioned technical pain points. Utility Model Content

[0006] To address the above problems, this utility model proposes a reinforcement structure for hollow slab beams of bridges, and the technical solution used is as follows: A bridge hollow slab beam reinforcement structure includes a hollow slab beam, steel cables, baffles, fasteners, and a reinforcement frame. Baffles are fitted to both ends of the hollow slab beam. Several steel cables slide through the hollow slab beam and baffles, with the extension direction of the steel cables being the same as the extension direction of the central axis of the hollow slab beam. Both ends of the steel cables are fixed to the corresponding baffles by fasteners. A reinforcement frame is fixed to the lower side of the hollow slab beam.

[0007] Furthermore, the hollow slab beam is equipped with a steel cage made of woven steel bars inside, which can improve the structural strength of the hollow slab beam itself.

[0008] Furthermore, the baffle includes a plate, a frame, and reinforcing ribs. The plate is fitted to the end of the hollow slab beam, and the frame is welded to the side of the plate. The frame is slidably installed within the internal cavity of the hollow slab beam. Several reinforcing ribs are welded to the inner wall of the frame and the plate. Several fasteners are fixed to the plate. This arrangement allows the frame to support the end of the hollow slab beam, thereby preventing deformation at the end of the hollow slab beam. Furthermore, the fastener includes a sleeve and a stud. The sleeve is fixed to the baffle by welding, and a portion of the stud is threaded into the inside of the sleeve. The end of the steel cable is fixed inside the stud, and a multi-faceted prism is integrally formed on the stud outside the sleeve. This arrangement allows for adjustment of the tension of the steel cable inside the hollow slab beam to adapt to different working conditions.

[0009] Furthermore, the reinforcing frame includes steel plates and limiting frames. Several steel plates are provided and stacked one on top of the other. Several limiting frames are fixed to the steel plates by bolts. The length of the steel plates is successively shortened from bottom to top. The corresponding limiting frames are all fixed to the lower side of the hollow slab beam by expansion bolts. This arrangement can reduce the deformation of the hollow slab beam.

[0010] Furthermore, both ends of the bottom steel plate are rotatably mounted with ring frames, the other end of which is rotatably connected to a corresponding positioning frame. The positioning frame is fixed to the hollow slab beam by expansion bolts. This arrangement can support the bottom steel plate.

[0011] Furthermore, friction pads (such as copper-based or composite material pads) are provided between the steel plates, and lubricant (molybdenum disulfide) is applied to the friction pads. This arrangement can increase the friction coefficient between the steel plates, thereby improving the energy consumption efficiency of the steel plates.

[0012] Compared with the prior art, the present invention has the following beneficial effects: This invention uses a through-type steel cable to apply a prestress to the hollow slab beam that is opposite to the bending moment caused by external loads (such as vehicles or self-weight). This prestress counteracts the downward deflection of the hollow slab beam, improving its stiffness and crack resistance. Furthermore, the tension of the steel cable inside the hollow slab beam can be adjusted by the cooperation of fasteners and baffles to adapt to different working conditions. The reinforcement frame of this utility model, with its gradually changing length steel plate design, allows stress to be smoothly transferred from the short steel plate to the long steel plate when the hollow slab beam is about to deform. This dissipates energy by utilizing the interlayer slippage and deformation of the steel plates, forming an effective earthquake and impact buffer mechanism, thereby protecting the hollow slab beam. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] Figure 2 This is a schematic diagram of the structure of the baffle of this utility model.

[0016] Figure 3 This is a utility model Figure 1 A magnified schematic diagram of the structure at position "A" in the middle.

[0017] Figure 4 This is a structural schematic diagram of the reinforcement frame of this utility model.

[0018] Figure 5 This is a utility model Figure 4 A magnified structural diagram of the area at position "B".

[0019] In the picture: 1-Hollow slab beam, 2-Steel cable, 3-Baffle, 31-Slab body, 32-Frame body, 33-Reinforcing rib, 4-Fastener, 41-Sleeve, 42-Stud, 5-Reinforcing frame, 51-Steel plate, 52-Limiting frame, 53-Ring frame, 54-Positioning frame. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0021] In the description of this utility model, it should be understood that the terms "upper", "middle", "outer", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0022] Please see Figure 1 As shown, this utility model is a reinforcement structure for a hollow slab beam of a bridge, including a hollow slab beam 1, steel cables 2, baffles 3, fasteners 4, and a reinforcement frame 5. Baffles 3 are attached to both ends of the hollow slab beam 1. Several steel cables 2 slide through the hollow slab beam 1 and the baffles 3. The extension direction of the steel cables 2 is the same as the extension direction of the central axis of the hollow slab beam 1. Both ends of the steel cables 2 are fixed to the corresponding baffles 3 by fasteners 4. The reinforcement frame 5 is fixed to the lower side of the hollow slab beam 1.

[0023] Specifically, the hollow slab beam 1 has a steel cage made of woven steel bars inside, which can improve the structural strength of the hollow slab beam 1 itself.

[0024] like Figure 2 As shown, the baffle 3 includes a plate 31, a frame 32, and reinforcing ribs 33. The plate 31 is fitted to the end of the hollow slab beam 1, and the frame 32 is fixed to the side of the plate 31 by welding. The frame 32 is slidably installed in the internal cavity of the hollow slab beam 1. Several reinforcing ribs 33 are fixed to the inner wall of the frame 32 and the plate 31 by welding. Several fasteners 4 are fixed on the plate 31. With this arrangement, the frame 31 can support the end of the hollow slab beam 1, thereby preventing deformation of the end of the hollow slab beam 1.

[0025] like Figure 3 As shown, the fastener 4 includes a sleeve 41 and a stud 42. The sleeve 41 is fixed to the baffle 3 by welding. The inside of the sleeve 41 is partially engaged with the stud 42 by threads. The end of the steel cable 2 is fixed inside the stud 42. The stud 42 located outside the sleeve 41 is integrally formed with a polygonal prism. With this arrangement, during use, the stud 42 can be rotated inside the sleeve 41 by using a tool in conjunction with the polygonal prism, thereby adjusting the tension of the steel cable 2 inside the hollow beam 1 to adapt to different working conditions.

[0026] like Figure 4 and Figure 5 As shown, the reinforcing frame 5 includes steel plates 51 and limiting frames 52. Several steel plates 51 are provided and are stacked one on top of the other. Several limiting frames 52 are fixed to the steel plates 51 by bolts. The length of the steel plates 51 is gradually shortened from bottom to top. The corresponding limiting frames 52 are all fixed to the lower side of the hollow slab beam 1 by expansion bolts. When the hollow slab beam 1 is about to deform, the design of the gradually changing length of the steel plates 51 can make the stress smoothly transferred from the short steel plates 51 to the long steel plates 51, and then use the interlayer slippage and deformation of the steel plates 51 to dissipate energy, thereby reducing the degree of deformation of the hollow slab beam 1.

[0027] Specifically, both ends of the bottom steel plate 51 are rotatably mounted with ring frames 53, and the other end of each ring frame 53 is rotatably connected to a corresponding positioning frame 54. The positioning frame 54 is fixed to the hollow plate beam 1 by expansion bolts. This arrangement can support the bottom steel plate 51, thereby preventing the bottom steel plate 51 from deforming under its own weight. When the steel plate 51 deforms, the ring frame 53 can move accordingly.

[0028] Specifically, friction pads (such as copper-based or composite material pads) are provided between the steel plates 51, and lubricant (molybdenum disulfide) is applied to the friction pads. This arrangement can increase the friction coefficient between the steel plates 51, thereby improving the energy consumption effect of the steel plates 51.

[0029] Please see Figure 1-5 As shown, this utility model is a reinforcement structure for hollow slab beams of bridges. Its working principle is as follows: When in use, through the cooperation of steel cable 2, baffle 3 and fastener 4, a prestress opposite to the bending moment caused by external load (such as vehicle or self-weight) can be applied to the hollow slab beam 1. In addition, the reinforcement frame 5 can consume the deformation energy of the hollow slab beam 1, thereby reducing the degree of deformation of the hollow bridge 1.

[0030] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0031] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A bridge hollow slab beam reinforcement structure, characterized in that: The assembly includes a hollow slab beam (1), steel cables (2), baffles (3), fasteners (4), and a reinforcing frame (5). Both ends of the hollow slab beam (1) are fitted with baffles (3). Several steel cables (2) slide through the hollow slab beam (1) and the baffles (3). The extension direction of the steel cables (2) is the same as the extension direction of the central axis of the hollow slab beam (1). Both ends of the steel cables (2) are fixed to the corresponding baffles (3) by fasteners (4). A reinforcing frame (5) is fixed to the lower side of the hollow slab beam (1).

2. The bridge hollow slab beam reinforcement structure as described in claim 1, characterized in that: The hollow slab beam (1) is a steel cage made of internal fixed steel bars.

3. The bridge hollow slab beam reinforcement structure as described in claim 1, characterized in that: The baffle (3) includes a plate (31), a frame (32) and reinforcing ribs (33). The plate (31) is fitted to the end of the hollow slab beam (1), and the frame (32) is fixed to the side of the plate (31). The frame (32) is slidably installed in the internal cavity of the hollow slab beam (1). Several reinforcing ribs (33) are fixed between the inner wall of the frame (32) and the plate (31). Several fasteners (4) are fixed on the plate (31).

4. The bridge hollow slab beam reinforcement structure as described in claim 1, characterized in that: The fastener (4) includes a sleeve (41) and a stud (42). The sleeve (41) is fixed on the baffle (3), and a portion of the stud (42) is threaded into the inside of the sleeve (41). The end of the steel cable (2) is fixed inside the stud (42), and a polygonal prism is integrally formed on the stud (42) outside the sleeve (41).

5. The bridge hollow slab beam reinforcement structure as described in claim 1, characterized in that: The reinforcing frame (5) includes a steel plate (51) and a limiting frame (52). There are several steel plates (51) and the steel plates (51) are stacked on top of each other. Several limiting frames (52) are fixed on the steel plates (51). The length of the steel plates (51) is shortened from bottom to top. The corresponding limiting frames (52) are all fixed to the lower side of the hollow slab beam (1) by expansion bolts.

6. The bridge hollow slab beam reinforcement structure as described in claim 5, characterized in that: Both ends of the bottom steel plate (51) are rotatably mounted with ring frames (53), and the other end of the ring frames (53) is rotatably connected to the corresponding positioning frames (54), which are fixed to the hollow slab beam (1).

7. A bridge hollow slab beam reinforcement structure as described in claim 5, characterized in that: Friction pads are fixed between the steel plates (51), and lubricant is applied to the friction pads.

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