A wide box girder bridge main girder roof reinforcing structure

Abstract

The utility model relates to beam bridge reinforcing technical field discloses a kind of wide box girder bridge girder roof reinforcing structure, including bridge body, the reinforcing assembly is arranged in the bottom of bridge body, the reinforcing assembly includes reinforcing plate, the reinforcing plate side wall is fixedly connected in the bottom of bridge body, reinforcing frame is fixedly connected in the reinforcing plate inside, reinforcing rib is fixedly connected in the reinforcing frame inside, horizontal plate is fixedly connected in the reinforcing frame inside, reinforcing steel plate is arranged in the reinforcing frame top, multiple locating shafts are fixedly connected in the reinforcing frame inner wall.In the utility model, the up-down bidirectional reinforcing design of reinforcing plate and reinforcing steel plate, through top surface reinforcing steel plate, resist direct impact and wear of vehicle, with the help of bottom surface reinforcing component reinforcing structure stiffness, to realize the effect of efficient reinforcement, solve the problem of roof local stress concentration caused by the force transmission synergy deficiency of prior art, improve the stress stability and long-term service efficiency of wide box girder bridge girder roof reinforcing.

Description

Technical Field

[0001] This utility model relates to the field of beam bridge reinforcement technology, and in particular to a reinforcement structure for the top plate of the main beam of a wide box girder bridge. Background Technology

[0002] Wide-span box girder bridges are widely used in highways, urban expressways, and cross-river bridges due to their advantages such as strong span capacity, high bridge deck traffic efficiency, and good overall structural stability. The main girder top slab, as a key component directly bearing vehicle loads and resisting environmental erosion, directly determines the bridge's traffic safety and service life. During long-term service, the main girder top slab is prone to a series of defects due to factors such as the large transverse span of the wide-span box girder top slab, uneven load distribution, concrete aging, and construction defects. These defects range from minor issues like transverse surface cracks and localized concrete spalling to more serious problems such as steel reinforcement corrosion, reduced load-bearing capacity, and even excessive deflection of the top slab, severely threatening the bridge's structural safety.

[0003] Currently, several mature solutions have been developed for strengthening the top slab of the main girder of wide-span box girder bridges. Each solution has its own emphasis on mechanical structure and technical principle. In terms of material and structural integration, the mainstream technology includes external prestressing reinforcement technology. This technology involves arranging prestressed steel strands under the top slab or on the outside of the web, and fixing the steel strands to the ends of the main girder or piers using anchors. By tensioning the steel strands, prestress is applied to the top slab to counteract the tensile stress generated by vehicle loads, thereby inhibiting crack propagation and improving the load-bearing capacity of the top slab. Its core mechanical structure consists of prestressed steel strands, anchors, steering blocks, and anti-corrosion sleeves. The technical principle is based on the active stress characteristics of prestressed concrete, which improves the stress state of the top slab by applying prestress externally.

[0004] Existing reinforcement technologies for addressing defects in the top slab of main beams in wide-span box girder bridges generally suffer from insufficient load transfer coordination, making it difficult to effectively prevent local stress concentration. For example, while external prestressing reinforcement can apply prestress through steel strands, the prestress is mainly transferred along the longitudinal direction of the bridge, offering limited relief for local load concentration in the wheel track zone caused by the large transverse span of the top slab. The small contact area between the steel strands and the top slab means that the load is mostly transferred to the main beam through local anchor points, easily creating new stress concentration areas near the anchor points and below the wheel track zone. This can induce crushing cracks in the top slab concrete around the anchor points. Although ordinary concrete thickening reinforcement can improve the overall stiffness of the top slab, the coordinated load-bearing between the new concrete layer and the original top slab depends on shear reinforcement. However, the density and length of shear reinforcement are limited. In the middle of the top slab with a large transverse span, the new and old concrete layers are prone to incoordination due to shear deformation, leading to local stress concentration below the wheel track zone and exacerbating the expansion of existing cracks. Therefore, a reinforcement structure for the top slab of main beams in wide-span box girder bridges is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides a reinforcement structure for the top plate of the main girder of a wide box girder bridge, aiming to improve the problem of local stress concentration caused by insufficient force transmission coordination in the existing reinforcement technology for the top plate of the main girder of wide box girder bridges.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A reinforcement structure for the top slab of the main girder of a wide box girder bridge includes a bridge body, and a reinforcement component is provided at the bottom of the bridge body. The reinforcement assembly includes a reinforcement plate, the sidewall of which is fixedly connected to the bottom of the bridge body. A reinforcement frame is fixedly connected inside the reinforcement plate, a reinforcing rib is fixedly connected inside the reinforcement frame, a horizontal plate is fixedly connected inside the reinforcement frame, a reinforcement steel plate is provided on the top of the reinforcement frame, multiple positioning shafts are fixedly connected to the inner wall of the reinforcement frame, a limit plate is fixedly connected to the inner wall of each positioning shaft, multiple fixing columns are fixedly connected to the bottom of the reinforcement steel plate, a fixing plate is fixedly connected to the outer wall of each fixing column, and each fixing plate engages with the limit plate. Multiple auxiliary components are provided at the bottom of the bridge body.

[0007] As a further description of the above technical solution: Each of the auxiliary components includes an auxiliary rod and a fixing plate. One end of each auxiliary rod is fixedly connected to the outer wall of the reinforcement frame, and each fixing plate is disposed at the bottom of the bridge body.

[0008] As a further description of the above technical solution: Each of the aforementioned fixing plates has multiple high-strength bolts threaded inside, and each of the high-strength bolts penetrates the fixing plate and is fixedly connected to the bridge body.

[0009] As a further description of the above technical solution: Each of the fixed plates has an arc-shaped block fixedly connected to its lower surface, and each arc-shaped block has an anti-slip groove inside.

[0010] As a further description of the above technical solution: Each of the bow-shaped blocks is fixedly connected to a limiting block, and each limiting block is matched with the auxiliary rod.

[0011] As a further description of the above technical solution: Each of the bow-shaped blocks has a screw threaded inside, and each screw has a transmission rod slidably connected inside.

[0012] As a further description of the above technical solution: Each of the transmission rods has anti-slip balls fixedly connected to both ends, and one end of each screw is in contact with the anti-slip groove.

[0013] This utility model has the following beneficial effects: 1. In this utility model, the bidirectional reinforcement design of the reinforcing plate and the reinforcing steel plate not only resists the direct impact and wear of vehicles by the top reinforcing steel plate, but also strengthens the structural rigidity by the bottom reinforcing components, thereby achieving a highly efficient reinforcement effect. This solves the problem of local stress concentration in the top plate caused by insufficient force transmission coordination in the existing technology, and improves the stress stability and long-term service efficiency of the reinforcement of the top plate of the main beam of the wide box girder bridge.

[0014] 2. In this utility model, the screw and the bow-shaped block are closed by rotating the transmission rod, thereby limiting the auxiliary rod and achieving the effect of initially positioning the reinforcement component. This provides convenience for the user's subsequent installation, solves the problem of low positioning accuracy and repeated adjustments required during the installation of traditional reinforcement components, and improves the positioning efficiency and installation accuracy of on-site construction. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of a reinforcement structure for the top plate of the main beam of a wide box girder bridge proposed in this utility model; Figure 2 This is a schematic diagram of the reinforcing plate of the main beam top plate reinforcement structure of a wide box girder bridge proposed in this utility model; Figure 3 This is a schematic diagram of the reinforcing steel plate of the main beam top plate reinforcement structure of a wide box girder bridge proposed in this utility model; Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 for Figure 3 Enlarged view of point B in the middle; Figure 6 This is a schematic diagram of the auxiliary rod of the main beam top plate reinforcement structure of a wide box girder bridge proposed in this utility model; Figure 7 for Figure 6 Enlarged view of point C in the middle.

[0016] Legend: 1. Bridge body; 2. Reinforcing plate; 3. Reinforcing frame; 4. Reinforcing rib; 5. Horizontal plate; 6. Reinforcing steel plate; 7. Positioning shaft; 8. Limiting plate; 9. Fixing column; 10. Fixing plate; 11. Auxiliary rod; 12. Fixing plate; 13. High-strength bolt; 14. Bow-shaped block; 15. Anti-slip groove; 16. Screw; 17. Transmission rod; 18. Limiting block; 19. Anti-slip ball. Detailed Implementation

[0017] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Reference Figure 1 - Figure 6 The present invention provides an embodiment of a reinforcement structure for the top slab of a wide box girder bridge, comprising a bridge body 1, a reinforcement component at the bottom of the bridge body 1, the reinforcement component being arranged in segments along the bridge direction of the bridge body 1, each segment covering a length adapted to the standard span of the bridge, to ensure comprehensive support for the key stress areas of the top slab. The reinforcement component includes a reinforcement plate 2. The two transverse side walls of the reinforcement plate 2 are fixedly connected to the bottom concrete surface of the bridge body 1 by welding. The transverse width of the reinforcement plate 2 is consistent with the transverse effective load-bearing width of the top plate of the bridge body 1, and the longitudinal length matches the coverage length of each reinforcement component. The side walls of the reinforcement plate 2 are fixedly connected to the bottom of the bridge body 1. A reinforcement frame 3 is fixedly connected inside the reinforcement plate 2. The reinforcement plate 2 has a reserved installation groove that matches the reinforcement frame 3. The reinforcement frame 3 is a frame structure and is fixedly connected in the installation groove. The transverse span of the reinforcement frame 3 is the same as the transverse width of the reinforcement plate 2. Multiple vertical support beams are set at intervals in the longitudinal direction to form a stable load-bearing frame. Reinforcing ribs 4 are fixedly connected inside the reinforcement frame 3. The reinforcing ribs 4 are distributed in a straight line to form a stable structure and enhance the overall deformation resistance of the reinforcement frame 3. The reinforcing frame 3 has horizontal plates 5 fixedly connected inside. The horizontal plates 5 are horizontal and evenly spaced along the bridge direction. The two ends of each horizontal plate 5 are fixed to the vertical support beams on both sides of the reinforcing frame 3, and the upper surface of the horizontal plate 5 is flush with the top of the reinforcing frame 3, providing a support surface for the reinforcing steel plate 6. The reinforcing steel plate 6 is set on the top of the reinforcing frame 3. The lateral coverage of the reinforcing steel plate 6 extends to the outer edges of both sides of the reinforcing frame 3, and the longitudinal length is consistent with the longitudinal length of the reinforcing frame 3, ensuring that it can fully bear the tensile stress transmitted by the top plate. Multiple positioning shafts 7 are fixedly connected to the inner wall of the reinforcing frame 3. Each positioning shaft 7 has a limit piece 8 fixedly connected to its inner wall. The positioning shafts 7 are evenly distributed along the length of the transverse connecting rod. Each positioning shaft 7 is a hollow cylinder. A limiting piece 8 is fixedly connected to the end of the wall away from the reinforcing frame 3. The limiting piece 8 has a ring structure and the inner diameter of the ring is smaller than the inner diameter of the positioning shaft 7. Multiple fixing posts 9 are fixedly connected to the bottom of the reinforcing steel plate 6. Each fixing post 9 has a fixing piece 10 fixedly connected to its outer wall. Each fixing piece 10 is engaged with the limiting piece 8. When the fixing post 9 is inserted into the positioning shaft 7, the fixing piece 10 can enter along with the fixing post 9 until it is engaged with the limiting piece 8. The ring edge of the limiting piece 8 can block the fixing piece 10. At the same time, the elastic deformation of the fixing piece 10 can tightly abut against the limiting piece 8, so as to realize the rapid positioning and initial fixation of the reinforcing steel plate 6 and the reinforcing frame 3. Multiple auxiliary components are set at the bottom of the bridge body 1 to assist users in installing the reinforcing components. Reference Figure 6 and Figure 7 Each auxiliary component includes an auxiliary rod 11 and a fixing plate 12. The structures of the auxiliary components are completely identical. Each component includes an auxiliary rod 11 for transmitting support force and a fixing plate 12 for fixing to the bridge body 1. One end of each auxiliary rod 11 is fixedly connected to the outer wall of the vertical support beam outside the reinforcement frame 3 by welding, and the other end extends towards the web of the bridge body 1. Each fixing plate 12 is located at the bottom of the bridge body 1 near the web. The fixing plate 12 is rectangular and its area can cover a local concrete area at the bottom of the bridge body 1. One end of each auxiliary rod 11 is fixedly connected to the outer wall of the reinforcement frame 3. Each fixing plate 12 is located at the bottom of the bridge body 1. Each fixing plate 12 has multiple high-strength bolts 13 threaded inside. The high-strength bolts 13 are evenly distributed along the perimeter of the fixing plate 12. Each high-strength bolt 13 penetrates the fixing plate 12 and extends into the concrete of the bridge body 1 and is fixedly connected to the pre-embedded steel bars in the top plate or the web steel bars to ensure that the fixing plate 12 and the bridge body 1 form a rigid connection. Each high-strength bolt 13 penetrates the fixing plate 12 and is fixedly connected to the bridge body 1. Each fixing plate 12 has an arched block 14 fixedly connected to its lower surface. The arched block 14 has an upwardly convex arc-shaped structure, and its inner arc conforms to the outer wall of the auxiliary rod 11. Multiple anti-slip grooves 15 are formed along the arc direction inside the arched block 14. The anti-slip grooves 15 are strip-shaped, and each arched block 14 has an anti-slip groove 15 inside. A limiting block 18 is fixedly connected inside each arched block 14. The limiting block 18 has a block-shaped structure, and its shape matches the outer contour of the auxiliary rod 11. When the other end of the auxiliary rod 11 is placed inside the arched block 14, the limiting block 18 can... The auxiliary rod 11 is laterally limited to prevent it from sliding left and right within the arc-shaped block 14. Each limiting block 18 is engaged with the auxiliary rod 11. Each arc-shaped block 14 is threaded with a screw 16. The axis of the screw 16 is perpendicular to the axis of the auxiliary rod 11. One end of the screw 16 can pass through the side wall of the arc-shaped block 14 and extend into the interior, while the other end remains outside for operation. Each screw 16 is slidably connected with a transmission rod 17. The length of the transmission rod 17 is greater than the length of the screw 16, and both ends of the transmission rod 17 can extend from both ends of the screw 16. Each transmission rod 17 is fixedly connected with anti-slip balls 19 at both ends. One end of each screw 16 is in contact with the anti-slip groove 15.

[0019] Working principle: When using the main girder top plate reinforcement structure of this wide box girder bridge, the reinforcement plate 2 is first installed at the bottom of the bridge body 1 by personnel, so that the reinforcement steel plate 6 is completely attached to the bottom of the bridge body 1. The reinforcement steel plate 6 is fully bonded to the tension zone of the bottom surface of the bridge body 1 with epoxy structural adhesive. When its bottom is connected to the reinforcement frame 3, the fixing column 9 is inserted into the positioning shaft 7 by personnel. The installation is achieved by the interlocking of the limiting piece 8 and the fixing piece 10, which provides guidance and operation convenience for the user. At the same time, the strength of the reinforcement frame 3 is ensured by multiple reinforcing ribs 4. The reinforcing ribs 4 are welded to the reinforcement frame 3 along the transverse direction of the bridge. Internally, a three-dimensional load-bearing skeleton is formed, thereby achieving the effect of efficiently reinforcing the bridge body 1. When installing the reinforcing plate 2, the user can first insert the auxiliary rod 11 into the limiting block 18 so that it fits into the limiting block 18. Then, by rotating the transmission rod 17, the screw 16 is driven to move inside the bow-shaped block 14, and then contacts the anti-slip groove 15 opened inside the bow-shaped block 14 to achieve closure, thus achieving the effect of initially positioning the reinforcing plate 2. This provides convenience for the user during subsequent installation, making it easier for the user to install and debug. At the same time, it also provides additional protection for the installation of the reinforcing plate 2.

Claims

1. A reinforcing structure for the top slab of a wide box girder bridge main girder, comprising a bridge body (1), characterized in that: The bridge body (1) is equipped with a reinforcement component at its bottom; The reinforcement components include a reinforcement plate (2), the side wall of which is fixedly connected to the bottom of the bridge body (1), a reinforcement frame (3) is fixedly connected inside the reinforcement plate (2), a reinforcing rib (4) is fixedly connected inside the reinforcement frame (3), a horizontal plate (5) is fixedly connected inside the reinforcement frame (3), a reinforcement steel plate (6) is provided on the top of the reinforcement frame (3), a plurality of positioning shafts (7) are fixedly connected to the inner wall of the reinforcement frame (3), a limiting piece (8) is fixedly connected to the inner wall of each positioning shaft (7), a plurality of fixing columns (9) are fixedly connected to the bottom of the reinforcement steel plate (6), a fixing piece (10) is fixedly connected to the outer wall of each fixing column (9), and each fixing piece (10) engages with the limiting piece (8). A plurality of auxiliary components are provided at the bottom of the bridge body (1).

2. The reinforcing structure for the top slab of the main girder of a wide box girder bridge according to claim 1, characterized in that: Each of the auxiliary components includes an auxiliary rod (11) and a fixing plate (12). One end of each auxiliary rod (11) is fixedly connected to the outer wall of the reinforcement frame (3), and each fixing plate (12) is disposed at the bottom of the bridge body (1).

3. The reinforcing structure for the top slab of the main beam of a wide box girder bridge according to claim 2, characterized in that: Each of the fixing plates (12) is internally threaded with multiple high-strength bolts (13), and each of the high-strength bolts (13) passes through the fixing plate (12) and is fixedly connected to the bridge body (1).

4. The reinforcing structure for the top slab of the main beam of a wide box girder bridge according to claim 3, characterized in that: Each of the fixed plates (12) has an arc-shaped block (14) fixedly connected to its lower surface, and each arc-shaped block (14) has an anti-slip groove (15) inside.

5. The reinforcing structure for the top slab of the main beam of a wide box girder bridge according to claim 4, characterized in that: Each of the bow-shaped blocks (14) is fixedly connected to a limiting block (18), and each of the limiting blocks (18) is engaged with the auxiliary rod (11).

6. The reinforcing structure for the top slab of the main beam of a wide box girder bridge according to claim 5, characterized in that: Each of the bow-shaped blocks (14) is threaded with a screw (16), and each of the screws (16) is slidably connected with a transmission rod (17).

7. The reinforcing structure for the top slab of the main beam of a wide box girder bridge according to claim 6, characterized in that: Each of the transmission rods (17) has anti-slip balls (19) fixedly connected to both ends, and one end of each screw (16) is in contact with the anti-slip groove (15).

Images