A low-shrinkage joint structure suitable for bridge widening and reconstruction projects

Abstract

This utility model discloses a low-shrinkage joint structure suitable for bridge widening and reconstruction projects, belonging to the field of bridge reconstruction technology. Its key technical features include an old bridge main body, a new bridge main body, a buffer component, and a support component. A joint is pre-installed between the old and new bridge main bodies. The buffer component is located within the joint and includes a top plate, a bottom plate, and a buffer plate. The buffer plate abuts against the inner wall of the joint. A connecting column is fixedly connected between the top and bottom plates. Two symmetrically distributed sliding sleeves are fitted onto the connecting column, and a spring abuts between the two sliding sleeves. A connecting rod is hinged between the sliding sleeves and the buffer plate. The technical effect is that by setting up the buffer component and support component, cracks caused by rigid tension are avoided when the new bridge main body settles or shifts laterally. This flexible buffer mechanism can control the relative displacement at the joint within a safe range, effectively eliminating stepped misalignments on the bridge deck and ensuring driving safety and smoothness.

Description

Technical Field

[0001] This utility model relates to the field of bridge reconstruction technology, specifically a low-shrinkage joint structure suitable for bridge widening and reconstruction projects. Background Technology

[0002] With the continuous growth of urban traffic flow, the capacity of existing bridges can no longer meet current demands, making bridge widening and reconstruction an important means to improve road transport efficiency. In bridge widening projects, the quality of the splicing between the old and new bridges (i.e., the main body of the old bridge and the main body of the new bridge) directly affects the structural safety and durability, and the splicing structure is the core link in the splicing construction.

[0003] In existing technologies, the splicing of new and old bridges often employs simple methods such as leaving gaps and filling joints with asphalt, or achieving connection through rigid concrete pouring. However, the main body of a new bridge is prone to longitudinal or vertical displacement due to foundation settlement and material shrinkage, while the main body of an old bridge is already relatively stable. This uneven deformation between the two can lead to rigid tension at the joint. Traditional rigid joints cannot buffer this displacement difference, easily resulting in cracks or even stepped misalignments. This not only affects the ride comfort but may also trigger load impacts from vehicle bumps, exacerbating structural damage.

[0004] Therefore, we propose a low-shrinkage joint structure suitable for bridge widening and reconstruction projects. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this utility model provides a low-shrinkage joint structure suitable for bridge widening and reconstruction projects. It solves the problem that traditional rigid joints cannot buffer this displacement difference, are prone to cracks or even stepped misalignments, which not only affect the ride comfort but may also cause load impacts from vehicle bumps, exacerbating structural damage.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a low-shrinkage joint structure suitable for bridge widening and reconstruction projects, comprising an old bridge main body, a new bridge main body, a buffer component, and a support component. A joint is reserved between the old bridge main body and the new bridge main body. The buffer component is installed inside the joint and includes a top plate, a bottom plate, and a buffer plate. The buffer plate abuts against the inner wall of the joint. A connecting column is fixedly connected between the top plate and the bottom plate. Two symmetrically distributed sliding sleeves are sleeved on the connecting column. A spring abuts between the two sliding sleeves. A connecting rod is hinged between the sliding sleeves and the buffer plate.

[0009] The support assembly includes a first support plate fixedly installed at the top of the joint and a second support plate fixedly installed at the bottom of the joint. A waterstop is pressed against the bottom of the first support plate. Asphalt concrete layers are fixedly connected to the top of both the old bridge body and the new bridge body. A support shell is fixedly installed between the asphalt concrete layers. An elastic concrete layer is provided inside the support shell.

[0010] Preferably, a first stud is fixedly connected to the top of the top plate, and a first positioning hole adapted to the first stud is provided on the first support plate. The first stud passes through the first positioning hole and is threadedly connected to a first nut.

[0011] Preferably, a second stud is fixedly connected to the bottom of the base plate, and a second positioning hole adapted to the second stud is provided on the second support plate. The second stud passes through the second positioning hole and is threadedly connected to a second nut.

[0012] Preferably, the outer surfaces of both the top plate and the bottom plate are provided with water-swellable adhesive strips.

[0013] Preferably, the second support plate is fixedly installed to the old bridge body and the new bridge body by means of the first bolt.

[0014] Preferably, the bottom of the support housing is fixedly installed to the old bridge body and the new bridge body by a second bolt.

[0015] Preferably, the two sides of the support shell are fixedly installed to the asphalt concrete layer by a third bolt.

[0016] (III) Beneficial Effects

[0017] Compared with the prior art, the present invention provides a method with the following beneficial effects:

[0018] 1. This utility model, by setting up a buffer component, when the main body of the new bridge settles or shifts laterally, the buffer plate is squeezed and pushes the connecting rod, which drives the sliding sleeve to slide along the connecting column and compress the spring. The elastic potential energy of the spring absorbs the displacement difference, avoiding cracks caused by rigid tension. This flexible buffer mechanism can control the relative displacement at the joint within a safe range, effectively eliminate the stepped misalignment of the bridge deck, and ensure driving safety and smoothness.

[0019] 2. This utility model, by setting up support components, can strengthen the support and waterproof the joint. After the elastic concrete layer fills the support shell, it works together with the asphalt concrete layer to bear the vehicle load. The shear force is transferred through the lateral restraint of the support shell, avoiding load concentration at the joint, thus improving the load transfer efficiency of the new and old bridges and reducing the probability of bridge deck pavement damage. At the same time, the support shell wraps the elastic concrete layer to prevent rainwater from directly eroding the core area of ​​the joint. The multiple waterproofing designs can reduce the seepage rate and significantly reduce the risk of steel corrosion and concrete deterioration. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of the buffer assembly of this utility model;

[0023] Figure 4 This is a schematic diagram of the structure of the first support plate of this utility model;

[0024] Figure 5 This is a schematic diagram of the structure of the second support plate of this utility model.

[0025] In the picture:

[0026] 1. The main body of the old bridge;

[0027] 2. Main body of the new bridge;

[0028] 3. Buffer assembly; 31. Top plate; 32. Bottom plate; 33. Buffer plate; 34. Connecting post; 35. Sliding sleeve; 36. Spring; 37. Connecting rod; 38. First stud; 39. First nut; 310. Second stud; 311. Second nut; 312. Water-swellable rubber strip;

[0029] 4. Support assembly; 41. First support plate; 42. Second support plate; 43. Waterstop; 44. Support shell; 45. Elastic concrete layer; 46. First positioning hole; 47. Second positioning hole; 48. First bolt; 49. Second bolt; 410. Third bolt;

[0030] 5. Asphalt concrete layer. Detailed Implementation

[0031] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0032] This utility model provides a technical solution:

[0033] Please see Figures 1-5A low-shrinkage joint structure suitable for bridge widening and reconstruction projects includes an old bridge main body 1, a new bridge main body 2, a buffer component 3, and a support component 4. A joint is reserved between the old bridge main body 1 and the new bridge main body 2. The buffer component 3 is installed in the joint and includes a top plate 31, a bottom plate 32, and a buffer plate 33. The buffer plate 33 abuts against the inner wall of the joint. A connecting column 34 is fixedly connected between the top plate 31 and the bottom plate 32. Two symmetrically distributed sliding sleeves 35 are fitted on the connecting column 34, and the two sliding sleeves 35 abut against each other. There is a spring 36, and a connecting rod 37 is hinged between the sliding sleeve 35 and the buffer plate 33. By setting up the buffer assembly 3, when the main body 2 of the new bridge settles or moves laterally, the buffer plate 33 is squeezed and pushes the connecting rod 37, which drives the sliding sleeve 35 to slide along the connecting column 34 and compress the spring 36. The elastic potential energy of the spring 36 absorbs the displacement difference and avoids cracks caused by rigid tension. This flexible buffer mechanism can control the relative displacement at the joint within a safe range, effectively eliminate the stepped misalignment of the bridge deck, and ensure driving safety and smoothness.

[0034] Specifically, the support assembly 4 includes a first support plate 41 fixedly installed at the top of the joint and a second support plate 42 fixedly installed at the bottom of the joint. The second support plate 42 is fixedly installed to the old bridge body 1 and the new bridge body 2 by first bolts 48. A waterstop 43 is pressed against the bottom of the first support plate 41. An asphalt concrete layer 5 is fixedly connected to the top of both the old bridge body 1 and the new bridge body 2. A support shell 44 is fixedly installed between the asphalt concrete layers 5. The bottom of the support shell 44 is fixedly installed to the old bridge body 1 and the new bridge body 2 by second bolts 49. The two sides of the support shell 44 are fixedly installed to the asphalt concrete layer 5 by third bolts 410. An elastic concrete layer 45 is provided inside the support shell 44. A first stud 38 is fixedly connected to the top of the top plate 31. The first support plate 41 has a corresponding stud 38. The first positioning hole 46 is fitted with a first stud 38 that passes through the first positioning hole 46 and is threadedly connected to a first nut 39. A second stud 310 is fixedly connected to the bottom of the base plate 32. A second positioning hole 47 adapted to the second stud 310 is opened on the second support plate 42. The second stud 310 passes through the second positioning hole 47 and is threadedly connected to a second nut 311. By setting the support component 4, the joint can be strengthened and waterproofed. After the elastic concrete layer 45 fills the support shell 44, it works together with the asphalt concrete layer 5 to bear the vehicle load. The shear force is transferred through the lateral constraint of the support shell 44, avoiding the load concentration at the joint, thus improving the load transfer efficiency of the new and old bridges and reducing the probability of bridge deck pavement damage. At the same time, the support shell 44 wraps the elastic concrete layer 45 to prevent rainwater from directly eroding the core area of ​​the joint. The multiple waterproofing designs can reduce the seepage rate and significantly reduce the risk of steel corrosion and concrete deterioration.

[0035] The outer surfaces of the top plate 31 and the bottom plate 32 are provided with water-swellable adhesive strips 312. By providing water-swellable adhesive strips 312, the water-swellable adhesive strips 312 will expand in volume after contact with water seepage, filling the tiny gaps between the top plate 31, the bottom plate 32 and the inner wall of the joint, and preventing water from seeping in along the structural gaps.

[0036] In practical use, the working principle of this utility model is as follows:

[0037] First, when the main body 2 of the new bridge settles or shifts laterally, the buffer plate 33 is squeezed and pushes the connecting rod 37, which drives the sliding sleeve 35 to slide along the connecting column 34 and compress the spring 36. The elastic potential energy of the spring 36 absorbs the displacement difference and avoids cracks caused by rigid tension. This flexible buffer mechanism can control the relative displacement at the joint within a safe range, effectively eliminate the stepped misalignment of the bridge deck, and ensure driving safety and smoothness.

[0038] The support component 4 strengthens the joint and provides waterproofing. After the elastic concrete layer 45 fills the support shell 44, it works together with the asphalt concrete layer 5 to bear the vehicle load. The lateral restraint of the support shell 44 transfers shear force, preventing load concentration at the joint and improving the load transfer efficiency between the new and old bridges, thus reducing the probability of pavement damage. At the same time, the support shell 44 encases the elastic concrete layer 45, preventing rainwater from directly eroding the core area of ​​the joint. This multi-layered waterproofing design reduces the seepage rate.

[0039] In summary, this low-shrinkage joint structure, applicable to bridge widening and reconstruction projects, utilizes a buffer component 3. When the main body 2 of the new bridge settles or shifts laterally, the buffer plate 33 is compressed and pushes the connecting rod 37, causing the sliding sleeve 35 to slide along the connecting column 34 and compress the spring 36. The elastic potential energy of the spring 36 absorbs the displacement difference, avoiding cracks caused by rigid tension. This flexible buffer mechanism can control the relative displacement at the joint within a safe range, effectively eliminating the stepped misalignment of the bridge deck and ensuring driving safety and smoothness.

[0040] The above are merely specific embodiments of this utility model, but the technical features of this utility model are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on this utility model to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of this utility model.

Claims

1. A low-shrinkage joint structure suitable for bridge widening and reconstruction projects, comprising the old bridge main body (1), the new bridge main body (2), a buffer component (3), and a support component (4), characterized in that: A joint is reserved between the old bridge body (1) and the new bridge body (2). The buffer assembly (3) is set in the joint. The buffer assembly (3) includes a top plate (31), a bottom plate (32) and a buffer plate (33). The buffer plate (33) abuts against the inner wall of the joint. A connecting column (34) is fixedly connected between the top plate (31) and the bottom plate (32). Two symmetrically distributed sliding sleeves (35) are sleeved on the connecting column (34). A spring (36) abuts between the two sliding sleeves (35). A connecting rod (37) is hinged between the sliding sleeves (35) and the buffer plate (33). The support assembly (4) includes a first support plate (41) fixedly installed at the top of the joint and a second support plate (42) fixedly installed at the bottom of the joint. A waterstop (43) is pressed against the bottom of the first support plate (41). An asphalt concrete layer (5) is fixedly connected to the top of both the old bridge body (1) and the new bridge body (2). A support shell (44) is fixedly installed between the asphalt concrete layers (5). An elastic concrete layer (45) is provided inside the support shell (44).

2. The low-shrinkage joint structure applicable to bridge widening and reconstruction projects according to claim 1, characterized in that: The top of the top plate (31) is fixedly connected to a first stud (38), and the first support plate (41) is provided with a first positioning hole (46) that is adapted to the first stud (38). The first stud (38) passes through the first positioning hole (46) and is threadedly connected to a first nut (39).

3. A low-shrinkage joint structure suitable for bridge widening and reconstruction projects according to claim 1, characterized in that: The bottom of the base plate (32) is fixedly connected to a second stud (310), and the second support plate (42) is provided with a second positioning hole (47) that is adapted to the second stud (310). The second stud (310) passes through the second positioning hole (47) and is threadedly connected to a second nut (311).

4. A low-shrinkage joint structure suitable for bridge widening and reconstruction projects according to claim 1, characterized in that: The outer surfaces of the top plate (31) and the bottom plate (32) are provided with water-swellable rubber strips (312).

5. A low-shrinkage joint structure suitable for bridge widening and reconstruction projects according to claim 1, characterized in that: The second support plate (42) is fixedly installed to the old bridge body (1) and the new bridge body (2) by the first bolt (48).

6. A low-shrinkage joint structure suitable for bridge widening and reconstruction projects according to claim 1, characterized in that: The bottom of the support shell (44) is fixedly installed to the old bridge body (1) and the new bridge body (2) by the second bolt (49).

7. A low-shrinkage joint structure suitable for bridge widening and reconstruction projects according to claim 1, characterized in that: The two sides of the support shell (44) are fixedly installed to the asphalt concrete layer (5) by the third bolt (410).

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