A new and old bridge splicing precast flexible structure for bridge widening and a construction method thereof

Abstract

The application provides a new and old bridge splicing precast flexible structure for bridge widening and a construction method thereof, and belongs to the technical field of bridge engineering. In the structure, the new bridge cap beam shockproof block comprises a first clamping block and a second clamping block, the cross-section beam comprises a web plate and wing plates, the wing plates separate the web plate to form a first plate body and a second plate body, the first plate body is clamped between the old bridge side beam and the new bridge side beam, the two wing plates are respectively overlapped below the old bridge side beam and the new bridge side beam and are fixed with the old bridge side beam and the new bridge side beam, the two ends of the cross-section beam along the length direction are respectively borne on two H-section beams, and the two ends of the second plate body are arranged in the beam groove; and the H-section beam is clamped on the first clamping block through the clamping groove. The application can effectively solve the defects of large additional stress at the connecting position, complex construction process and the like in the prior art, and the precast structure form can also shorten the construction period.

Description

Technical Field

[0001] This application belongs to the field of bridge engineering technology, specifically relating to a precast resilient structure for widening bridges by splicing new and old bridges and its construction method. Background Technology

[0002] In bridge reconstruction and expansion projects, the connection technology between new and old bridges has always been one of the core issues. In order to better ensure the integrity and coordination between the new and old bridges, avoid the problem of uneven distribution of internal forces in the bridge structure caused by widening, and improve the load-bearing capacity and stability of the bridge.

[0003] In related technologies, for the reconstruction and expansion projects of urban roads and highway bridges with high traffic volume, the connection between the old and new bridges often adopts a "connection both above and below" model. This involves using rebar installation technology to connect the reinforcing bars of the old bridge's side beams and cap beams to the corresponding reinforcing bars in the widened section, followed by concrete pouring to connect the two, thus splicing the old and new bridges together. This splicing method requires extensive rebar installation work on both the upper and lower structures of the bridge, resulting in complex construction techniques, a long construction period, and significant additional internal forces at the connection points, making them prone to damage under long-term cyclic loading.

[0004] Therefore, it is necessary to provide a precast resilient structure for widening bridges by splicing new and old bridges and its construction method to solve the problems mentioned in the background art. Summary of the Invention

[0005] This application provides a prefabricated resilient structure for splicing new and old bridges for bridge widening and its construction method. The resilient splicing structure is set only below the side beams of the new and old bridges, which can effectively solve the defect of large additional stress at the connection position in the prior art. Moreover, the connection structure is prefabricated, and only simple splicing is required during construction. The construction process is simple and can greatly shorten the construction period.

[0006] To solve the above-mentioned technical problems, the technical solution of this application is as follows: A prefabricated resilient structure for widening bridges, used to connect old and new bridges in the width direction, wherein the old bridge includes side beams, cap beams, and seismic blocks for the cap beams; the new bridge includes side beams, cap beams, and seismic blocks for the cap beams; the upper surface of the seismic blocks for the cap beams of the new bridge has a vertically recessed groove forming a groove that divides the seismic blocks into a first locking block and a second locking block; the prefabricated resilient structure for widening bridges includes: The H-shaped cross-section beam is supported on the anti-vibration block of the new bridge cap beam and is fixed to the anti-vibration block of the old bridge cap beam and the anti-vibration block of the new bridge cap beam on its left and right sides respectively. A cross-shaped cross-section beam includes a web and two flanges disposed on both sides of the web. The flanges divide the web into a first plate and a second plate. The first plate is located above the flanges, and the second plate is located below the flanges. The first plate is sandwiched between the old bridge side beam and the new bridge side beam. The two flanges overlap the old bridge side beam and the new bridge side beam respectively and are fixed to the old bridge side beam and the new bridge side beam by fastening devices. The H-shaped cross-section beam includes a beam body, a first leg, and a second leg. The first leg and the second leg are both located at the bottom of the beam body and are spaced apart at opposite ends of the beam body. The upper surface of the beam body has a vertically recessed beam-placement groove. The first leg and the second leg form a locking groove spaced apart. The beam-placement groove is located directly above the locking groove. The two ends of the cross-shaped cross-section beam along its length are respectively supported by two H-shaped cross-section beams, and the two ends of the second plate are placed in the beam-placement groove. The H-shaped cross-section beam is locked onto the first locking block through the locking groove. The first leg is clamped between the old bridge cap beam anti-vibration block and the new bridge cap beam anti-vibration block. The second leg is confined within the groove.

[0007] Preferably, both the H-shaped cross-section beam and the cross-shaped cross-section beam are precast reinforced concrete, wherein the concrete is ultra-high performance concrete.

[0008] Preferably, the cross-sectional area of ​​the first plate is larger than the cross-sectional area of ​​the second plate.

[0009] Preferably, the old bridge cap beam and the new bridge cap beam are located at the same horizontal height, the old bridge side beam and the new bridge side beam are located at the same horizontal height, and the old bridge cap beam anti-vibration block and the new bridge cap beam anti-vibration block are located at the same horizontal height; the upper surface of the first plate is flush with the upper surfaces of the old bridge side beam and the new bridge side beam.

[0010] Preferably, limiting devices are provided at the contact positions of the first leg and the old bridge cap beam anti-vibration block and the second leg and the second locking block; the old bridge cap beam anti-vibration block / second locking block is provided with a first locking groove, and the first leg / second leg is provided with a corresponding second locking groove. The first locking groove and the second locking groove communicate to form an installation groove. The limiting device includes a side plate, a horizontal plate and a plate clamp. The side plate and the plate clamp are located at opposite ends of the installation groove along the length direction. The cross-sectional area of ​​the side plate and the plate clamp is larger than the opening area of ​​the installation groove. A portion of the horizontal plate is located in the first locking groove and another portion is located in the second locking groove. The plate clamp and the horizontal plate are detachably connected.

[0011] Preferably, the fastening device includes a galvanized high-strength bolt, a rubber washer, and a galvanized high-strength coupling nut. A first bolt hole is provided through the flange, and the galvanized high-strength coupling nut is embedded in the first bolt hole. The old bridge side beam and the new bridge side beam are provided with second bolt holes corresponding to the positions of the first bolt holes. The second bolt holes are aligned and connected with the first bolt holes. The nut of the galvanized high-strength bolt is limited to the top of the old bridge side beam / new bridge side beam. The bolt passes through the second bolt hole and the first bolt hole and is connected and fastened to the galvanized high-strength coupling nut. The rubber washer is sandwiched between the nut of the galvanized high-strength bolt and the old bridge side beam / new bridge side beam.

[0012] Preferably, a rubber support is also provided in the beam placement groove, and the two ends of the second plate along the length direction are supported on the rubber support.

[0013] Preferably, the joint between any two of the H-shaped cross-section beams, cross-shaped cross-section beams, new bridges, and old bridges is filled with asphalt mastic to ensure a dense seal.

[0014] This application also provides a construction method for the above-mentioned bridge widening project using a precast flexible structure for splicing new and old bridges, comprising the following steps: Step S1: Precast H-section beams and cross-section beams, and transport them to the construction site; Step S2: Hoist the H-section beam and place it on the new bridge cap beam anti-vibration block. Then fix the left and right sides to the old bridge cap beam anti-vibration block and the new bridge cap beam anti-vibration block, respectively. Step S3: Hoist the cross-shaped section beam so that both ends of the second plate are placed in the beam placement groove. The first plate is sandwiched between the old bridge side beam and the new bridge side beam. The two wing plates are respectively overlapped under the old bridge side beam and the new bridge side beam, and the two wing plates are respectively fixed to the old bridge side beam and the new bridge side beam by fastening devices. Step S4 involves using asphalt mastic to tightly fill the joints between any two H-section beams, cross-section beams, new bridges, and old bridges, thus completing the construction process.

[0015] The beneficial effects of this application are as follows: (1) By using H-shaped cross-section beams and cross-shaped cross-section beams to connect the upper and lower structures of the new and old bridges into a whole, the upper and lower structures of the new and old bridges can share the load, effectively limit the settlement difference between the new and old bridges, and better ensure the smoothness of the bridge deck; (2) H-section beams and cross-section beams are prefabricated components, which only require simple assembly and connection on site, reducing the difficulty and risk of on-site construction. Moreover, the construction method is simple and flexible, which can effectively improve construction efficiency, shorten the construction period, and save project costs. (3) H-section beams and cross-section beams are prefabricated structures made of steel bars and ultra-high performance concrete, which have the advantages of being lightweight, high-strength, high-toughness and high-durability. Attached Figure Description

[0016] Figure 1 This application provides a reference diagram showing the service status of a prefabricated resilient structure for widening bridges by splicing new and old bridges. Figure 2 This application provides a schematic diagram illustrating the connection between a prefabricated flexible structure for widening bridges and the new and old bridges. Figure 3 A schematic diagram showing the structure of a cross-shaped cross-section beam; Figure 4 A schematic diagram showing the structure of an H-section beam; Figure 5 A schematic diagram showing the connection structure between a cross-shaped cross-section beam and an H-shaped cross-section beam; Figure 6 A schematic diagram showing the structure of the limiting device. Detailed Implementation

[0017] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] Please refer to the following: Figures 1-6 This application provides a prefabricated resilient structure for widening bridges by splicing old and new bridges, which is used to connect old bridge 200 and new bridge 300 in the width direction to widen old bridge 200.

[0019] The old bridge 200 includes an old bridge cap beam 210, an old bridge side beam 220, and an old bridge cap beam anti-vibration block 230; the new bridge 300 includes a new bridge cap beam 310, a new bridge side beam 320, and a new bridge cap beam anti-vibration block 330. The upper surface of the new bridge cap beam anti-vibration block 330 is vertically recessed to form a groove, which divides the new bridge cap beam anti-vibration block 330 into a first locking block 3301 and a second locking block 3302.

[0020] The old bridge cap beam 210 and the new bridge cap beam 310 are located at the same horizontal level, the old bridge side beam 220 and the new bridge side beam 320 are located at the same horizontal level, and the old bridge cap beam anti-vibration block 230 and the new bridge cap beam anti-vibration block 330 are located at the same horizontal level. In this embodiment, the new bridge 300 is located to the right of the old bridge 200, thereby widening the right side of the old bridge 200; in other embodiments, the new bridge 300 may also be located to the left of the old bridge 200, thereby widening the left side of the old bridge 200; or the new bridge 300 may be located on both the left and right sides of the old bridge 200 simultaneously, thereby widening both sides of the old bridge 200.

[0021] The bridge widening project uses a precast tough structure 100 made by splicing new and old bridges, which includes an H-shaped cross-section beam 10 and a cross-shaped cross-section beam 20.

[0022] Both the H-shaped cross-section beam 10 and the cross-shaped cross-section beam 20 are precast reinforced concrete, specifically ultra-high performance concrete, giving them advantages such as lightweight, high strength, high toughness, and high durability. The precast H-shaped cross-section beams 10 and 20 can be directly transported to the construction site for assembly, eliminating the need for on-site concrete pouring and waiting for the concrete to harden, thus significantly shortening the construction period.

[0023] The H-shaped cross-section beam 10 includes a beam body 11, a first leg 12, and a second leg 13. The first leg 12 and the second leg 13 are both disposed at the bottom of the beam body 11 and are spaced apart at opposite ends of the beam body 11. A beam placement groove 110 is formed by a vertical recess on the upper surface of the beam body 11. The first leg 12 and the second leg 13 are spaced apart to form a snap-fit ​​groove 120, and the beam placement groove 110 is located directly above the snap-fit ​​groove 120.

[0024] The H-shaped cross-section beam 10 is snapped onto the first locking block 3301 via the snap-fit ​​groove 120. The first leg 12 is clamped between the old bridge cap beam anti-vibration block 230 and the new bridge cap beam anti-vibration block 330. The second leg 13 is confined within the groove. This arrangement can position the H-shaped cross-section beam 10 during installation and limit its movement after installation, restricting the left and right movement of the H-shaped cross-section beam 10 in the width direction and improving the stability of the structure.

[0025] Furthermore, limiting devices 30 are provided at the contact positions of the first support leg 12 and the old bridge cap beam anti-vibration block 230, and at the contact positions of the second support leg 13 and the second locking block 3302. Specifically, the old bridge cap beam anti-vibration block 230 / second locking block 3302 is provided with a first locking groove, and the first support leg 12 / second support leg 13 is provided with a second locking groove. The first locking groove and the second locking groove communicate to form an installation groove. The limiting position 30 includes a side plate 31, a horizontal plate 32, and a plate clamp 33. The side plate 31 and the plate clamp 33 are located at opposite ends of the installation groove. The cross-sectional area of ​​the side plate 31 and the plate clamp 33 is larger than the opening area of ​​the installation groove. Part of the horizontal plate 32 is located in the first locking groove, and another part is located in the second locking groove. The side plate 31 and the plate clamp 33 can limit the forward and backward movement of the H-shaped cross-section beam 10 in the length direction, and the horizontal plate 32 can limit the vertical displacement difference between the new and old bridge cap beams. The plate clamp 33 and the horizontal plate 32 are detachably connected, for example by bolts, or by setting a T-shaped groove on the plate clamp 33 along the width direction and setting a matching T-shaped slider on the horizontal plate 32, with the slider correspondingly engaging in the groove to achieve a fixed fixation in the length direction.

[0026] The cross-shaped cross-section beam 20 includes a web 21 and two flanges 22 disposed on both sides of the web 21. The flanges 22 divide the web 21 into a first plate 211 and a second plate 212. The first plate 211 is located above the flanges 22, and the second plate 212 is located below the flanges 22. The first plate 211 is sandwiched between the old bridge side beam 220 and the new bridge side beam 320, and the upper surface of the first plate 211 is flush with the upper surfaces of the old bridge side beam 220 and the new bridge side beam 320. The two flanges 22 are respectively overlapped below the old bridge side beam 220 and the new bridge side beam 320, and are fixed to the old bridge side beam 220 and the new bridge side beam 320 by fastening devices 40.

[0027] The cross-sectional area of ​​the first plate 211 is larger than that of the second plate 212, which can better achieve the widening effect.

[0028] The first plate 211 is located only between the old bridge side beam 220 and the new bridge side beam 320, and does not cover the entire old bridge side beam 220 and the new bridge side beam 320. This ensures that there is no height difference between the old bridge side beam 220 and the new bridge side beam 320 and the secondary side beam, middle beam and other structures, and no additional leveling is required, effectively solving the defects in the prior art.

[0029] The upper surface of the beam body 11 has a vertically recessed beam placement groove 110, and both ends of the second plate 212 along its length are placed in the beam placement groove 110. The beam placement groove 110 can serve as a positioning function during the installation of the cross-shaped cross section beam 20 and as a limiting function after installation.

[0030] The beam placement groove 110 is located directly above the snap-fit ​​groove 120. After installation, the load on the cross-shaped cross section beam 20 can be directly transferred to the new bridge 300 through the H-shaped cross section beam 10, and the second leg 13 is supported on the new bridge cap beam 310, thereby relieving the load borne by the old bridge 200 and effectively protecting the old bridge 200.

[0031] A rubber support 14 is also provided inside the beam placement groove 110, and both ends of the second plate 212 are supported on the rubber support 14. The rubber support 14 can play a buffering role to avoid relative vibration between the H-shaped cross-section beam 10 and the cross-shaped cross-section beam 20, which would affect the stability of the structure.

[0032] The fastening device 40 includes a galvanized high-strength bolt, a rubber washer, and a galvanized high-strength coupling nut. A first bolt hole is provided through the wing plate 22. The galvanized high-strength coupling nut is embedded in the first bolt hole. The old bridge side beam 220 and the new bridge side beam 320 are provided with second bolt holes corresponding to the positions of the first bolt holes. The second bolt holes are aligned and connected with the first bolt holes. The nut of the galvanized high-strength bolt is limited to the top of the old bridge side beam 220 / new bridge side beam 320. The bolt passes through the second bolt hole and the first bolt hole and is connected and fastened to the galvanized high-strength coupling nut. The rubber washer is sandwiched between the nut of the galvanized high-strength bolt and the old bridge side beam 220 / new bridge side beam 320.

[0033] It should be noted that the first bolt hole is pre-embedded in the flange 22, while the second bolt hole needs to be drilled on the old bridge side beam 220 and the new bridge side beam 320 on site.

[0034] The joints between any two of the H-section beam 10, cross-section beam 20, new bridge 300, and old bridge 200 are filled with asphalt mastic to improve waterproofing.

[0035] This application also provides a construction method for the precast flexible structure 100 for splicing new and old bridges for the widening of the above-mentioned bridge, including the following steps: Step S1: Precast H-section beams and cross-section beams, and transport them to the construction site; Step S2: Hoist the H-section beam and place it on the new bridge cap beam anti-vibration block. Then fix the left and right sides to the old bridge cap beam anti-vibration block and the new bridge cap beam anti-vibration block, respectively. Step S3: Hoist the cross-shaped section beam so that both ends of the second plate are placed in the beam placement groove. The first plate is sandwiched between the old bridge side beam and the new bridge side beam. The two wing plates are respectively overlapped under the old bridge side beam and the new bridge side beam, and the two wing plates are respectively fixed to the old bridge side beam and the new bridge side beam by fastening devices. Step S4 involves using asphalt mastic to tightly fill the joints between any two H-section beams, cross-section beams, new bridges, and old bridges, thus completing the construction process.

[0036] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A precast flexible structure for widening bridges, used to connect an old bridge and a new bridge in the width direction, wherein the old bridge includes side beams, cap beams, and anti-seismic blocks for the cap beams, and the new bridge includes side beams, cap beams, and anti-seismic blocks for the cap beams, characterized in that... The upper surface of the new bridge cap beam seismic blocking block is vertically recessed to form a groove, which divides the new bridge cap beam seismic blocking block into a first locking block and a second locking block; the bridge widening prefabricated flexible structure splicing new and old bridges includes: The H-shaped cross-section beam is supported on the anti-vibration block of the new bridge cap beam and is fixed to the anti-vibration block of the old bridge cap beam and the anti-vibration block of the new bridge cap beam on its left and right sides respectively. A cross-shaped cross-section beam includes a web and two flanges disposed on both sides of the web. The flanges divide the web into a first plate and a second plate. The first plate is located above the flanges, and the second plate is located below the flanges. The first plate is sandwiched between the old bridge side beam and the new bridge side beam. The two flanges overlap the old bridge side beam and the new bridge side beam respectively and are fixed to the old bridge side beam and the new bridge side beam by fastening devices. The H-shaped cross-section beam includes a beam body, a first leg, and a second leg. The first leg and the second leg are both located at the bottom of the beam body and are spaced apart at opposite ends of the beam body. The upper surface of the beam body has a vertically recessed beam-placement groove. The first leg and the second leg form a locking groove spaced apart. The beam-placement groove is located directly above the locking groove. The two ends of the cross-shaped cross-section beam along its length are respectively supported by two H-shaped cross-section beams, and the two ends of the second plate are placed in the beam-placement groove. The H-shaped cross-section beam is locked onto the first locking block through the locking groove. The first leg is clamped between the old bridge cap beam anti-vibration block and the new bridge cap beam anti-vibration block. The second leg is confined within the groove.

2. The precast resilient structure for widening bridges by splicing new and old bridges according to claim 1, characterized in that, Both the H-shaped cross-section beam and the cross-shaped cross-section beam are precast reinforced concrete, wherein the concrete is ultra-high performance concrete.

3. The prefabricated flexible structure for splicing new and old bridges for bridge widening according to claim 1, characterized in that, The cross-sectional area of ​​the first plate is larger than that of the second plate.

4. The precast flexible structure for splicing new and old bridges for bridge widening according to claim 1, characterized in that, The old bridge cap beam and the new bridge cap beam are at the same horizontal level, the old bridge side beam and the new bridge side beam are at the same horizontal level, and the old bridge cap beam anti-vibration block and the new bridge cap beam anti-vibration block are at the same horizontal level; the upper surface of the first plate is flush with the upper surfaces of the old bridge side beam and the new bridge side beam.

5. The precast resilient structure for widening bridges by splicing new and old bridges according to claim 1, characterized in that, Limiting devices are provided at the contact positions of the first leg and the old bridge cap beam anti-vibration block and the second leg and the second locking block; the old bridge cap beam anti-vibration block / second locking block is provided with a first locking groove, and the first leg / second leg is provided with a corresponding second locking groove. The first locking groove and the second locking groove are connected to form an installation groove. The limiting device includes a side plate, a horizontal plate and a plate clamp. The side plate and the plate clamp are located at opposite ends of the installation groove along the length direction. The cross-sectional area of ​​the side plate and the plate clamp is larger than the opening area of ​​the installation groove. A part of the horizontal plate is located in the first locking groove and another part is located in the second locking groove. The plate clamp and the horizontal plate are detachably connected.

6. The precast flexible structure for splicing new and old bridges for bridge widening according to claim 1, characterized in that, The fastening device includes a galvanized high-strength bolt, a rubber washer, and a galvanized high-strength coupling nut. A first bolt hole is provided through the flange, and the galvanized high-strength coupling nut is embedded in the first bolt hole. The old bridge side beam and the new bridge side beam are provided with second bolt holes corresponding to the positions of the first bolt holes. The second bolt holes are aligned and connected with the first bolt holes. The nut of the galvanized high-strength bolt is located above the old bridge side beam / new bridge side beam. The bolt passes through the second bolt hole and the first bolt hole and is connected and fastened to the galvanized high-strength coupling nut. The rubber washer is sandwiched between the nut of the galvanized high-strength bolt and the old bridge side beam / new bridge side beam.

7. The precast resilient structure for widening bridges by splicing new and old bridges according to claim 1, characterized in that, A rubber support is also provided in the beam placement groove, and the two ends of the second plate along the length direction are supported on the rubber support.

8. The precast resilient structure for widening bridges by splicing new and old bridges according to claim 1, characterized in that, The joints between any two H-section beams, cross-section beams, new bridges, and old bridges are filled with asphalt mastic to ensure density.

9. A construction method for a precast flexible structure for bridge widening using splicing of old and new bridges as described in any one of claims 1-8, characterized in that, Includes the following steps: Step S1: Precast H-section beams and cross-section beams, and transport them to the construction site; Step S2: Hoist the H-section beam and place it on the new bridge cap beam anti-vibration block. Then fix the left and right sides to the old bridge cap beam anti-vibration block and the new bridge cap beam anti-vibration block, respectively. Step S3: Hoist the cross-shaped section beam so that both ends of the second plate are placed in the beam placement groove. The first plate is sandwiched between the old bridge side beam and the new bridge side beam. The two wing plates are respectively overlapped under the old bridge side beam and the new bridge side beam, and the two wing plates are respectively fixed to the old bridge side beam and the new bridge side beam by fastening devices. Step S4 involves using asphalt mastic to tightly fill the joints between any two H-section beams, cross-section beams, new bridges, and old bridges, thus completing the construction process.

Images