Bridge deck connection structure at new and old bridge connection

Abstract

The utility model relates to bridge deck connection technical field discloses a bridge deck connection structure of new and old bridge link, including two small box girder and T type roof, the T type roof is left and deposites 50mm sealed seam between two small box girder, and is used to provide space under the deformation of stress, temperature change situation, avoid mutual extrusion damage, the sealed seam is used to fill up rubber board and carries out sealing, and the seam is filled with bituminous mastic, the small box girder with the top side of T type roof is provided with cast -in -place slab, the top left and right ends of cast -in -place slab all cut have the seam of width 3mm, depth 30mm, and are used for bituminous mastic irrigation. In the utility model, through rubber board and bituminous mastic filling, avoid rainwater from the interstices between the beam leakage into the bridge inside, multiple waterproof measures close cooperation, reduce the erosion of rainwater to bridge structure, and then prolong its service life.

Description

Technical Field

[0001] This utility model relates to the field of bridge deck connection technology, and in particular to a bridge deck connection structure at the junction of a new and an old bridge. Background Technology

[0002] The bridge deck at the junction of a new and old bridge refers to the area where the new bridge connects to the existing bridge in terms of deck structure. This area needs to ensure a smooth transition between the new and old bridge decks in terms of traffic function, structural stress, drainage system, and flatness. It is a key structural node in bridge reconstruction and expansion projects, as vehicle loads are transferred to the main bridge structure through the bridge deck. If the junction of the new and old bridges is not properly constructed, the load cannot be effectively transferred, resulting in localized stress concentration at the end of the old bridge or the starting point of the new bridge, leading to structural cracks, deformation, and other defects.

[0003] First, roughen the bridge surface and clean up debris. Remove rust and prevent corrosion from the steel bars. Then, drill holes, install the steel bars, and complete the pull-out test. Next, tie or weld the new steel mesh. Then, install a sturdy template that meets the design elevation and apply a release agent. If there are expansion joints in the design, reserve the slots and install the expansion joint fixing device. Use micro-expansion concrete to pour and vibrate in layers until the concrete strength reaches the standard.

[0004] In existing technologies, the bridge deck connection structure at the junction of new and old bridges is prone to deformation due to vehicle traffic during operation. This can lead to steel corrosion caused by rainwater intrusion, or cracks and damage due to the lack of buffer space during structural deformation. As a result, the service life of the bridge is reduced and the maintenance cost is increased. Therefore, in order to address the above shortcomings, a new bridge deck connection structure at the junction of new and old bridges is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides a bridge deck connection structure at the junction of new and old bridges, aiming to improve the problem that some existing bridge deck connection structures at the junction of new and old bridges suffer from rainwater infiltration and reduced service life due to vehicle rolling during operation.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a bridge deck connection structure at the junction of a new and old bridge, comprising two small box girders and a T-beam. A 50mm sealing joint is provided between the T-beam and the two small box girders to provide space for deformation under stress and temperature changes, preventing mutual compression damage. The sealing joint is filled with a rubber sheet for sealing, and the joint is filled with asphalt mastic. A cast-in-place slab is provided on the top side of the small box girders and the T-beam. The top left and right ends of the cast-in-place slab are cut with a 3mm wide and 30mm deep slit for asphalt mastic pouring. A 2mm thick isolation layer is provided on both the left and right ends of the cast-in-place slab by brushing two coats of asphalt and laying a layer of plastic film. Multiple reinforcing bars are provided on the top side of the cast-in-place slab. A cast-in-place layer is provided on the top of the multiple cast-in-place slabs. Two reinforcing components are provided on the adjacent side of the two small box girders and on the left and right sides of the T-beam.

[0007] The above technical solution involves two small box girders and a T-beam. A 50mm sealing joint between the T-beam and the small box girders provides space for deformation under stress and temperature changes, preventing mutual compression damage. The joint is filled with rubber sheets and asphalt mastic to enhance sealing and waterproofing. The top of the cast-in-place slabs of the small box girders and T-beams is cut and filled with asphalt mastic for further waterproofing. A 2mm thick isolation layer is installed at both ends to prevent excessive adhesion to the beam surface and facilitate relative displacement during structural deformation. The top reinforcement of the cast-in-place slab enhances tensile strength. The top cast-in-place layer and the cast-in-place slab work together to bear vehicle loads. The reinforcement components on the adjacent sides of the two small box girders and the left and right sides of the T-beams improve the connection strength between the new and old bridges.

[0008] As a further description of the above technical solution: each of the two reinforcement components includes two reinforcement plates. The external surfaces of the multiple reinforcement plates are respectively fixedly connected to the adjacent side of the two small box girders and the left and right sides of the T-beam. The internal surfaces of the two reinforcement plates are slidably connected to a connecting plate. The internal surfaces of the connecting plates are threaded with two lead rods. The left and right ends of the connecting plate are slidably connected to triangular blocks. The left and right ends of the connecting plate are slidably connected to trapezoidal plates.

[0009] The above technical solution involves two reinforcing components, each containing two reinforcing plates. These plates are externally fixedly connected and installed on the adjacent side of the two small box girders and on the left and right sides of the T-beam, respectively, to enhance the stability of the connection between the new and old bridges. The internal sliding connecting plates of the two reinforcing plates cooperate with two threaded screws. The rotation of the screws allows the connecting plates to move, adjusting the tightness of the reinforcing components. The triangular blocks and trapezoidal plates that are slidably connected at the left and right ends of the connecting plates interact with each other during movement, allowing the trapezoidal plates to slide into the interior of the reinforcing plates and engage, further improving the connection strength between the new and old bridges and ensuring the overall stability of the bridge structure.

[0010] As a further description of the above technical solution: a handle is fixedly connected to the front side of the lead screw.

[0011] The above technical solution involves a handle fixedly connected to the front of the lead screw. By gripping the handle, a rotational force can be applied, causing the lead screw to rotate and thus enabling the lead screw to move back and forth.

[0012] As a further description of the above technical solution: the inner wall of the connecting plate has two limiting openings on both the upper and lower sides.

[0013] The above technical solution involves opening two limiting openings on the upper and lower sides of the inner wall of the connecting plate. These limiting openings are used to guide the sliding of the guide block.

[0014] As a further description of the above technical solution: guide blocks are fixedly connected to both the upper and lower sides of the triangular block.

[0015] The above technical solution involves fixedly connecting guide blocks to both the upper and lower sides of the triangular block, with the guide blocks slidingly engaging with the limiting openings on the inner wall of the connecting plate.

[0016] As a further description of the above technical solution: the guide block is externally slidably connected inside the limiting opening.

[0017] The above technical solution involves the guide block being externally slidably connected to the inside of the limiting opening. Through the sliding cooperation between the two, the sliding of the triangular block is guided and limited.

[0018] As a further description of the above technical solution: the trapezoidal plate is slidably connected to the inside of the reinforcing plate.

[0019] Through the above technical solution: the trapezoidal plate is externally slidably connected to the inside of the reinforcing plate. When the triangular block slides against the trapezoidal plate, the trapezoidal plate can smoothly slide into the reinforcing plate to achieve engagement.

[0020] As a further description of the above technical solution: the adjacent sides of the two trapezoidal plates are respectively slidably connected to the distant sides of the two triangular blocks.

[0021] The above technical solution involves sliding the two trapezoidal plates to their respective opposite sides, allowing the triangular blocks to push the trapezoidal plates toward their opposite sides when they slide.

[0022] This utility model has the following beneficial effects:

[0023] 1. In this utility model, by cutting 3mm wide and 30mm deep slits at both ends of the top of the cast-in-place slab and pouring asphalt mastic, rainwater is effectively prevented from seeping through the top of the slab. At the same time, two coats of asphalt are applied to both ends of the cast-in-place slab, and a 2mm isolation layer of plastic film is laid to further isolate moisture and prevent rainwater from intruding into the gap between the beam and the cast-in-place slab. The 50mm sealing joint between the T-beam and the small box girder is filled with rubber sheet and asphalt mastic to prevent rainwater from seeping into the bridge interior from the gap between the beams. Multiple waterproof measures work together to reduce the erosion of the bridge structure by rainwater, thereby extending its service life.

[0024] 2. In this utility model, by pushing the triangular block to slide and then pressing against the trapezoidal plate, the two opposite trapezoidal plates slide to the opposite side and engage inside the reinforcing plate, thereby completing the reinforcement between the small box girder and the T-beam and improving the stability of the connection. Attached Figure Description

[0025] Figure 1 This is a perspective view of a bridge deck connection structure at the junction of a new and an old bridge, as proposed in this utility model.

[0026] Figure 2 This is a schematic diagram of the cast-in-place layer of the bridge deck connection structure at the junction of a new and an old bridge, as proposed in this utility model.

[0027] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0028] Figure 4 This is a schematic diagram of the guide block for a bridge deck connection structure at the junction of a new and old bridge, as proposed in this utility model.

[0029] Legend:

[0030] 1. Small box girder; 2. T-beam; 3. Sealing joint; 4. Cast-in-place slab; 5. Isolation layer; 6. Reinforcing steel; 7. Cast-in-place layer; 8. Reinforcing plate; 9. Connecting plate; 10. Screw rod; 11. Handle; 12. Limiting opening; 13. Triangular block; 14. Guide block; 15. Trapezoidal plate. Detailed Implementation

[0031] 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.

[0032] Reference Figures 1 to 2This utility model provides an embodiment of a bridge deck connection structure at the junction of an old and a new bridge, comprising two small box girders 1 and a T-beam 2. The small box girders 1 are the old bridge, and the T-beam 2 is the new bridge. A 50mm sealing joint 3 is provided between the T-beam 2 and the two small box girders 1 to provide space for deformation under stress, temperature changes, etc., to avoid mutual compression damage and to prevent cracks and damage to the old and new bridge structures due to mutual compression. The sealing joint 3 is filled with a rubber sheet for sealing, and the joint is filled with asphalt mastic. The rubber sheet has good elasticity and can absorb some deformation energy. A cast-in-place slab 4 is provided on the top side of the small box girders 1 and the T-beam 2 to directly bear the vehicle load.

[0033] Specifically, a 50mm sealing joint 3 is provided between the two small box girders 1 and the T-beam 2, which serves as the new bridge. This sealing joint provides space for deformation under stress and temperature changes, preventing mutual compression damage and preventing cracks and damage to the old and new bridge structures. The sealing joint 3 is filled with a rubber sheet and asphalt mastic. The good elasticity of the rubber sheet can absorb some of the deformation energy. The top sides of the small box girders 1 and the T-beam 2 are provided with cast-in-place slabs 4 that directly bear the vehicle load.

[0034] Both ends of the top of the cast-in-place slab 4 are cut with a width of 3mm and a depth of 30mm for asphalt mastic pouring to enhance waterproofing. This also acts as a buffer when the cast-in-place slab 4 undergoes minor deformation due to temperature changes, vehicle loads, etc., preventing further expansion of cracks. Both ends of the cast-in-place slab 4 are provided with a 2mm thick isolation layer 5 made by brushing two coats of asphalt and laying a layer of plastic film to prevent excessive adhesion between the cast-in-place slab 4 and the beam surface. When the bridge structure deforms, a certain relative displacement between the two is allowed to avoid structural damage due to excessive adhesion and to coordinate the deformation of the old and new structures. Multiple steel bars 6 are provided on the top side of the cast-in-place slab 4 to enhance its tensile strength and withstand the tensile force generated by vehicle traffic, preventing cracks from appearing in the cast-in-place slab 4. A cast-in-place layer 7 is provided on top of the multiple cast-in-place slabs 4. The cast-in-place layer 7 is one of the load-bearing layers of the bridge superstructure and works together with the cast-in-place slab 4 to jointly bear the vehicle load.

[0035] Specifically, the top left and right ends of the cast-in-place slab 4 have 3mm wide and 30mm deep slits for pouring asphalt mastic, which enhances waterproofing and acts as a buffer when the cast-in-place slab 4 undergoes minor deformation due to temperature changes and vehicle loads, preventing crack expansion. The left and right ends are provided with a 2mm thick isolation layer 5 made by brushing two coats of asphalt and laying a layer of plastic film to prevent excessive adhesion to the beam surface, allowing relative displacement between the two when the bridge structure deforms, avoiding excessive adhesion that could lead to structural damage, and coordinating the deformation of the old and new structures. Multiple steel bars 6 are set on the top side of the cast-in-place slab 4 to enhance its tensile strength, withstand the tension generated by vehicle traffic, and prevent cracks. A cast-in-place layer 7 is set on top of multiple cast-in-place slabs 4 as one of the load-bearing layers of the bridge superstructure, working together with the cast-in-place slabs 4 to jointly bear the vehicle load.

[0036] Reference Figures 2 to 4 Two reinforcing components are provided on the adjacent side of the two small box beams 1 and the left and right sides of the T-beam 2 to improve the connection strength between the small box beams 1 and the T-beam 2. Each reinforcing component includes two reinforcing plates 8. The external parts of the multiple reinforcing plates 8 are fixedly connected to the adjacent side of the two small box beams 1 and the left and right sides of the T-beam 2, and are fixed by welding or casting. The internal parts of the two reinforcing plates 8 are slidably connected to a connecting plate 9. The two reinforcing plates 8 restrict one connecting plate 9, so that the connecting plate 9 can be installed stably. The internal parts of the connecting plate 9 are threadedly connected to two screw rods 10. The front side of the screw rod 10 is fixedly connected to a handle 11. By holding the handle 11, a rotational force is applied to drive the screw rod 10 to rotate, and then it can move back and forth. The inner walls of the connecting plate 9 have two limiting openings 12 on the upper and lower sides. The limiting openings 12 are rectangular.

[0037] Specifically, two reinforcing components are provided on the adjacent side of the two small box girders 1 and on the left and right sides of the T-beam 2 to improve the connection strength between the small box girders 1 and the T-beam 2. Each reinforcing component includes two reinforcing plates 8. Multiple reinforcing plates 8 are fixed to the adjacent side of the two small box girders 1 and on the left and right sides of the T-beam 2 by welding or casting. Connecting plates 9 are slidably connected inside the two reinforcing plates 8. The reinforcing plates 8 limit the connecting plates 9 to ensure their installation stability. Two screw rods 10 are threaded inside the connecting plates 9. A handle 11 is fixedly connected to the front side of the screw rods 10. The screw rods 10 can be rotated by rotating the handle 11 to achieve forward and backward movement. Two rectangular limiting openings 12 are opened on the upper and lower sides of the inner wall of the connecting plates 9.

[0038] Triangular blocks 13 are slidably connected to both ends of the connecting plate 9. The triangular blocks 13 slide back and forth inside the connecting plate 9, and due to their length, the triangular blocks 13 will not shift. Guide blocks 14 are fixedly connected to both the upper and lower sides of the triangular blocks 13 by welding. The outer side of the guide blocks 14 is slidably connected to the inside of the limiting opening 12. The limiting opening 12 guides the guide blocks 14 to slide, and then guides the triangular blocks 13 to slide. Trapezoidal plates 15 are slidably connected to both ends of the connecting plate 9. The connecting plate 9 restricts the trapezoidal plates 15 to slide stably. The outer side of the trapezoidal plates 15 is slidably connected to the inside of the reinforcing plate 8. The trapezoidal plates 15 are engaged by sliding into the inside of the reinforcing plate 8. The adjacent sides of the two trapezoidal plates 15 are slidably connected to the opposite sides of the two triangular blocks 13. The triangular blocks 13 slide against the trapezoidal plates 15, allowing the two trapezoidal plates 15 to slide to the opposite side.

[0039] Specifically, the left and right ends of the connecting plate 9 are slidably connected to triangular blocks 13. The triangular blocks 13 can slide back and forth inside the connecting plate 9 and will not shift due to their own length. The upper and lower sides are fixed by welded guide blocks 14. The guide blocks 14 slide within the limiting opening 12 to guide the sliding of the triangular blocks 13. The left and right ends of the connecting plate 9 are also slidably connected to trapezoidal plates 15, which slide stably under the restriction of the connecting plate 9. The trapezoidal plates 15 slide into the reinforcing plate 8 to achieve engagement. The adjacent sides of the two trapezoidal plates 15 are slidably connected to the distant sides of the two triangular blocks 13 respectively. When the triangular blocks 13 slide, they will abut against the trapezoidal plates 15, causing the two trapezoidal plates 15 to slide to the distant side.

[0040] Working principle: Before construction, the existing bridge deck reinforcement 6 layout is checked. If there is a conflict, the reinforcement 6 is adjusted. The top surface of the precast beam is roughened and cleaned. At the same time, materials and tools such as rubber sheets, asphalt mastic, and reinforcement 6 are prepared. During construction, a 50mm sealing joint 3 is left between the T-beam 2 and the small box girder 1. The joint is filled with rubber sheets and then filled with asphalt mastic. A 3mm wide and 30mm deep groove is cut at both ends of the top of the cast-in-place slab 4 and asphalt mastic is poured in. Two coats of asphalt are brushed on both ends of the cast-in-place slab 4, and a 2mm isolation layer 5 is laid with plastic film. Then, the top side reinforcement 6 of the cast-in-place slab 4 is arranged. After removing part of the original cast-in-place layer 7 to allow the reinforcement 6 to extend in, it is poured together with the new bridge to form the cast-in-place layer 7, and the expansion joint pre-embedded parts are embedded.

[0041] Subsequently, the reinforcing plate 8 is fixed at the corresponding positions of the small box girder 1 and the T-beam 2. The handle 11 is held to apply a rotational force to drive the lead screw 10 to rotate and move backward, while pushing the triangular block 13 to slide. Then, it abuts against the trapezoidal plate 15, so that the two opposite trapezoidal plates 15 slide to the opposite side and engage inside the reinforcing plate 8, thereby completing the reinforcement between the small box girder 1 and the T-beam 2 and improving the stability of the connection.

[0042] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A bridge deck connection structure at the junction of an old and a new bridge, comprising two small box girders (1) and a T-beam (2), characterized in that: A 50mm sealing gap (3) is provided between the T-beam (2) and the two small box beams (1) to provide space for deformation under stress and temperature changes, and to avoid mutual squeezing damage. The sealing gap (3) is used to fill the rubber plate for sealing, and the gap is filled with asphalt mastic. A cast-in-place slab (4) is provided on the top side of the small box beam (1) and the T-beam (2). The top left and right ends of the cast-in-place slab (4) are cut with a 3mm wide and 30mm deep gap for asphalt mastic pouring. A 2mm thick isolation layer (5) is provided on the left and right ends of the cast-in-place slab (4) by brushing two layers of asphalt and laying a layer of plastic film. Multiple steel bars (6) are provided on the top side of the cast-in-place slab (4). A cast-in-place layer (7) is provided on the top of the multiple cast-in-place slabs (4). Two reinforcing components are provided on the adjacent side of the two small box beams (1) and the left and right sides of the T-beam (2).

2. The bridge deck connection structure at the junction of old and new bridges according to claim 1, characterized in that: Both of the reinforcement components include two reinforcement plates (8). The external parts of the multiple reinforcement plates (8) are respectively fixedly connected to the adjacent side of the two small box girders (1) and the left and right sides of the T-beam (2). The internal parts of the two reinforcement plates (8) are slidably connected to a connecting plate (9). The internal parts of the connecting plate (9) are threadedly connected to two screw rods (10). The left and right ends of the connecting plate (9) are slidably connected to triangular blocks (13). The left and right ends of the connecting plate (9) are slidably connected to trapezoidal plates (15).

3. The bridge deck connection structure at the junction of old and new bridges according to claim 2, characterized in that: A handle (11) is fixedly connected to the front side of the lead screw (10).

4. The bridge deck connection structure at the junction of old and new bridges according to claim 3, characterized in that: The connecting plate (9) has two limiting openings (12) on both the upper and lower sides of its inner wall.

5. The bridge deck connection structure at the junction of old and new bridges according to claim 4, characterized in that: Guide blocks (14) are fixedly connected to both the upper and lower sides of the triangular block (13).

6. The bridge deck connection structure at the junction of an old and a new bridge according to claim 5, characterized in that: The guide block (14) is externally slidably connected to the inside of the limiting opening (12).

7. The bridge deck connection structure at the junction of old and new bridges according to claim 2, characterized in that: The trapezoidal plate (15) is externally slidably connected to the interior of the reinforcing plate (8).

8. The bridge deck connection structure at the junction of an old and a new bridge according to claim 2, characterized in that: The two trapezoidal plates (15) are slidably connected on the adjacent sides to the two triangular blocks (13) on the distant sides respectively.

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