Spherical support capable of preventing radial cumulative creep of curved bridge

Abstract

The utility model relates to bridge support technical field especially relates to a spherical support of curve bridge radial cumulative creeping prevention, including first bottom plate, second bottom plate and rubber pad, first bottom plate and second bottom plate are square structure of equal width, the top of first bottom plate forms the spherical groove of cross section arc, the bottom of second bottom plate places in the top of first bottom plate, the bottom of second bottom plate forms the spherical surface matched with spherical groove shape, rubber pad is square structure, its bottom is connected with the top of second bottom plate, the width of rubber pad is less than the width of second bottom plate. The utility model discloses through the spherical support of big radius prevents cumulative creeping, can also prevent the phenomenon of the great temperature deformation bending stress of forcedly not allowing radial creeping to take place, improves the security of curve bridge.

Description

Technical Field

[0001] This utility model relates to the field of bridge bearing technology, and in particular to a spherical bearing that can prevent radial cumulative creep of curved bridges. Background Technology

[0002] In modern bridge engineering, especially in the design of curved bridges, bearings, as crucial connecting components between the bridge and its foundation, bear the functions of transferring loads, allowing structural deformation, and adjusting the bridge's position. With changes in ambient temperature, the bridge structure undergoes thermal expansion and contraction, causing radial displacement of the bearings and the bridge itself, which gradually accumulates and forms radial creep. This creep not only affects the structural safety of the bridge but can also cause unevenness on the bridge deck, impacting traffic safety.

[0003] Traditional bearings are mostly rigid or elastic bearings. Although they can alleviate deformation to some extent, they are difficult to achieve effective self-recovery, which leads to the gradual accumulation of radial creep and affects the normal use of the bridge.

[0004] Based on the above reasons, this utility model designs a spherical support that can prevent radial cumulative creep of curved bridges. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a spherical bearing that can prevent radial cumulative creep of curved bridges. When the bridge is subjected to temperature changes or loads, the bearing will deform radially. Since the bottom of the second base plate forms a smooth spherical surface and can slide along the spherical groove on the top of the first base plate, it can buffer and disperse the load. When the external force is removed, it can restore its original shape through the elastic rebound of the rubber pad, thus slowing down the cumulative speed of radial creep.

[0006] To achieve the purpose of this utility model, the technical solution adopted by this utility model is as follows: This utility model discloses a spherical support that can prevent radial cumulative creep of curved bridges, including a first base plate, a second base plate, and a rubber pad. The first base plate and the second base plate are square structures with equal widths. The top of the first base plate forms a spherical groove with an arc-shaped cross-section. The bottom of the second base plate is placed on top of the first base plate. The bottom of the second base plate forms a spherical surface that matches the shape of the spherical groove. The rubber pad has a square structure, and its bottom is connected to the top of the second base plate. The width of the rubber pad is smaller than the width of the second base plate.

[0007] The radius r of the sphere is in the range of , where R is the radius of the curved bridge deck.

[0008] The bottom of the first base plate is connected to the top of the bridge cap beam, and the top of the rubber pad is connected to the bottom of the bridge superstructure. The top of the bridge cap beam and the bottom of the bridge superstructure are respectively provided with insertion grooves for insertion into the bottom of the first base plate and the top of the rubber pad.

[0009] The outer walls of the rubber pad and the first base plate are respectively connected to an upper fixing plate and a lower fixing plate. The upper fixing plate and the lower fixing plate are square in structure. The middle of the two plates is provided with an upper connecting hole and a lower connecting hole with the same width as the rubber pad and the first base plate. The inner walls of the upper connecting hole and the lower connecting hole are respectively connected to the outer walls of the rubber pad and the first base plate. Mounting holes are provided at the four corners of the upper fixing plate and the lower fixing plate.

[0010] The distance from the upper surface of the upper fixing plate to the upper surface of the rubber pad is equal to the depth of the insertion groove at the bottom of the bridge superstructure; the distance between the lower surface of the lower fixing plate and the lower surface of the first base plate is equal to the depth of the insertion groove at the top of the bridge cap beam.

[0011] The upper fixing plate has square connecting blocks on the left and right sides of its bottom. The bottom of the connecting blocks is connected to a pull plate by bolts. The outer wall of the pull plate is flush with the outer wall of the connecting block. The width of the pull plate is greater than the width of the connecting block. The upper left and right sides of the outer wall of the first base plate have pull plate limiting blocks. In the vertical direction, the inner end of the pull plate is located between the bottom of the pull plate limiting block and the top of the left and right ends of the lower fixing plate. There are gaps between the pull plate, the pull plate limiting block and the lower fixing plate.

[0012] The left and right side walls of the lower fixing plate are connected to connecting plates by bolts. Connecting columns are provided on both sides of the outer wall of the connecting plate. The outer ends of the connecting columns are flush with the left and right side walls of the upper fixing plate. Threaded holes for connecting vertical connecting rods are provided on the ends of the connecting columns and on the left and right side walls of the upper fixing plate. The upper and lower ends of the vertical connecting rods are provided with through holes for connecting bolts to pass through. The connecting bolts pass through the through holes and are threadedly connected to the threaded holes.

[0013] The beneficial effects of this utility model are as follows: (1) When the bridge is subjected to temperature changes or loads, the bearing will undergo radial deformation. Since the bottom of the second base plate forms a smooth spherical surface and can slide along the spherical groove on the top of the first base plate, it can buffer and disperse the load. When the external force is removed, it can restore its original shape through the elastic rebound of the rubber pad, thus slowing down the cumulative speed of radial creep. (2) The large-radius spherical support prevents cumulative creep and also prevents the phenomenon of huge temperature deformation bending stress caused by forcibly disallowing radial creep, thus improving the safety of the curved bridge. Attached Figure Description

[0014] Figure 1 This is an exploded view of Example 1; Figure 2 This is a cross-sectional schematic diagram of Example 1; Figure 3 This is a schematic diagram of the structure of Example 2; Figure 4 This is the left view of Embodiment 2; Figure 5 for Figure 4 Sectional view along AA; Figure 6 A schematic diagram of the overall stable equilibrium state of a spherical support; Figure 7 This is a diagram showing the distribution of beam supports in Example 3; Figure 8 Comparison of radial creep before and after optimization of the No. 3 support at mid-span in Example 3; Figure 9 This is a comparison of radial creep before and after optimization of the No. 4 support at the mid-span in Example 3.

[0015] In the attached diagram, 1 is the first base plate, 2 is the second base plate, 3 is the rubber pad, 6 is the bridge cap beam, 7 is the bridge superstructure, 8 is the insertion slot, 9 is the upper fixing plate, 10 is the lower fixing plate, 11 is the upper connecting hole, 12 is the lower connecting hole, 13 is the mounting hole, 14 is the connecting block, 15 is the pull plate, 16 is the pull plate limiting block, 17 is the connecting plate, 18 is the connecting column, 19 is the vertical connecting rod, 20 is the connecting bolt, and 21 is the spherical surface. Detailed Implementation

[0016] The present invention will be further described below: Please see Figure 1-9 , Example 1: As Figure 1-2 As shown, this embodiment discloses a spherical bearing for preventing radial cumulative creep of curved bridges, including a first base plate 1, a second base plate 2, and a rubber pad 3. The first base plate 1 and the second base plate 2 are square structures with equal widths. The top of the first base plate 1 forms a spherical groove with an arc-shaped cross-section. The bottom of the second base plate 2 is placed on top of the first base plate 1, and the bottom of the second base plate 2 forms a spherical surface 21 that matches the shape of the spherical groove. The rubber pad 3 is square in structure, and its bottom is connected to the top of the second base plate 2. The width of the rubber pad 3 is smaller than the width of the second base plate 2. The contact surface between the spherical surface 21 at the bottom of the second base plate 2 and the spherical groove at the top of the first base plate 1 is smooth, allowing the bridge to slide relative to each other under load and temperature conditions. The rubber pad 3 is made of high-strength elastic material and has good elastic deformation and self-recovery capabilities. The rubber pad of the spherical bearing has good elastic buffering performance and can effectively reduce vibration transmission.

[0017] When the bridge is subjected to temperature changes or loads, the bearings will undergo radial deformation. Because the bottom of the second base plate 2 forms a smooth spherical surface 21 and can slide freely along the spherical groove at the top of the first base plate 1, it can buffer and distribute the load. When the external force is removed, it can recover its original shape through the elastic rebound of the rubber pad 3, slowing down the cumulative rate of radial creep. Furthermore, the overall stable equilibrium state of the spherical bearing, such as... Figure 6 This allows the bridge to automatically return to a balanced state after being disturbed, avoiding irreversible deformation caused by imbalance. In this way, radial creep of the bridge is effectively controlled, the accumulation of structural deformation is greatly reduced, and the service life of the bridge is extended.

[0018] Furthermore, the radius r of the sphere 21 ranges from... , where R is the radius of the curved bridge deck.

[0019] Furthermore, the bottom of the first base plate 1 is connected to the top of the bridge cap beam 6, and the top of the rubber pad 3 is connected to the bottom of the bridge superstructure 7. The top of the bridge cap beam 6 and the bottom of the bridge superstructure 7 are respectively provided with insertion grooves 8 for the bottom of the first base plate 1 and the top of the rubber pad 3 to be inserted, so that the connection between the first base plate 1 and the bridge cap beam 6 is more stable, and the connection between the rubber pad 3 and the bridge superstructure 7 is more stable.

[0020] Example 2: Figure 3-5 As shown, the similarities between this embodiment and Embodiment 1 will not be repeated here. The difference lies in that the outer walls of the rubber pad 3 and the first base plate 1 are respectively connected to an upper fixing plate 9 and a lower fixing plate 10. The upper fixing plate 9 and the lower fixing plate 10 are square in structure, and the middle of them are provided with an upper connecting hole 11 and a lower connecting hole 12 with the same width as the rubber pad 3 and the first base plate 1. The inner walls of the upper connecting hole 11 and the lower connecting hole 12 are respectively connected to the outer walls of the rubber pad 3 and the first base plate 1. The four corners of the upper fixing plate 9 and the lower fixing plate 10 are provided with mounting holes 13. By setting the upper fixing plate 9 and the lower fixing plate 10, the upper fixing plate 9 is connected to the bridge superstructure 7 through the mounting holes 13 and bolts, and the lower fixing plate 10 is connected to the bridge cap beam 6 through the mounting holes 13 and bolts, which further improves the connection strength between the base plate 1 and the bridge cap beam 6, and the connection strength between the rubber pad 3 and the bridge superstructure 7.

[0021] Furthermore, the distance from the upper surface of the upper fixing plate 9 to the upper surface of the rubber pad 3 is equal to the depth of the bottom insertion groove 8 of the bridge superstructure 7; the distance between the lower surface of the lower fixing plate 10 and the lower surface of the first base plate 1 is equal to the depth of the top insertion groove 8 of the bridge cap beam 6.

[0022] Furthermore, square connecting blocks 14 are provided on the left and right sides of the bottom of the upper fixing plate 9. A pull plate 15 is bolted to the bottom of each connecting block 14. The outer wall of the pull plate 15 is flush with the outer wall of the connecting block 14, and the width of the pull plate 15 is greater than the width of the connecting block 14. Pull plate limiting blocks 16 are provided on the upper left and right sides of the outer wall of the first base plate 1. In the vertical direction, the inner end of the pull plate 15 is located between the bottom of the pull plate limiting block 16 and the top of the left and right ends of the lower fixing plate 10. A gap is provided between the pull plate 15 and the pull plate limiting block 16 and the lower fixing plate 10. By setting the pull plate 15 between the pull plate limiting block 16 and the lower fixing plate 9, and with gaps between the three, when the spherical surface 21 on the lower surface of the second base plate 2 slides in the spherical groove at the top of the first base plate 1, it will drive the pull plate 15 to move. When the displacement of the spherical surface 21 exceeds the displacement range limited by the pull plate 15, the pull plate 15 will be restricted by the pull plate limiting block 16 or the lower fixing plate 9, thereby ensuring the stability of the spherical support. When the spherical surface 21 of the spherical support is within the normal sliding range, the pull plate 15 does not interfere with the pull plate limiting block 16 or the lower fixing plate 9. When the rubber pad 3 is subjected to a large tensile force, the upper surface of the pull plate 15 will contact the lower surface of the pull plate limiting plate 16 and interfere, forming a tensile restriction, thereby preventing the rubber pad 3 from detaching from the spherical support.

[0023] Furthermore, connecting plates 17 are bolted to the left and right side walls of the lower fixing plate 10. Connecting posts 18 are provided on both sides of the outer wall of the connecting plate 17. The outer ends of the connecting posts 18 are flush with the left and right side walls of the upper fixing plate 9. Threaded holes for connecting vertical connecting rods 19 are provided on the ends of the connecting posts 18 and on the left and right side walls of the upper fixing plate 9. Through holes for connecting bolts 20 to pass through are provided at the upper and lower ends of the vertical connecting rods 19. The connecting bolts 20 pass through the through holes and are threaded into the threaded holes. The upper fixing plate 9 is then connected via the vertical connecting rods 19. The fixed plate 9 is connected to the lower fixed plate 10 to keep the entire spherical support stable during installation and the initial stage before the application of the structure's self-weight, preventing the components from separating or sliding relative to each other before being in place. The specific installation process is as follows: after the pull plate 15 is fixed to the bottom of the connecting block 14 with bolts, the connecting plate 17 is fixed to the two side walls of the lower fixed plate 10 with bolts. Then, the connecting bolts 20 are passed through the through holes above and below the vertical connecting rod 19, and connected to the threaded holes on the left and right side walls of the upper fixed plate 19 and the connecting holes at the ends of the connecting column 18, respectively.

[0024] Example 3: A curved bridge has three spans and four piers. The angle between any two adjacent piers is 20°. The central angle of the curved bridge is 40°, and the radius of curvature is... R =130m, bridge deck cross-sectional height h =0.4m, width b=6m, the arrangement and numbering of the curved bridge supports are as follows: Figure 7 As shown.

[0025] The initial temperature was set at 15℃, and the highest temperature on the bridge deck was 55℃. During finite element analysis, the daily temperature of the bridge deck was simulated as it rose from 15℃ to 55℃ and then gradually decreased back to 15℃, completing one cycle. Simulation calculations were performed with one step corresponding to one temperature; 10 steps represented one day's temperature change. The temperature loads calculated at each node were then imported into the static structure for finite element analysis. Supports #3 and #4 at mid-span were taken as the research objects. Before optimization, they were traditional rubber supports; after optimization, they adopted the spherical support structure proposed in this patent. Simulation analysis yielded a comparison of the radial creep of the mid-span supports before and after optimization. Figure 8 and 9 As shown. The new spherical bearing not only reduces radial creep, but more importantly, its spherical surface prevents cumulative creep.

[0026] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A spherical bearing for preventing radial cumulative creep of curved bridges, characterized in that: The system includes a first base plate (1), a second base plate (2), and a rubber pad (3). The first base plate (1) and the second base plate (2) are square structures with equal widths. The top of the first base plate (1) forms a spherical groove with an arc-shaped cross section. The bottom of the second base plate (2) is placed on top of the first base plate (1). The bottom of the second base plate (2) forms a spherical surface (21) that matches the shape of the spherical groove. The rubber pad (3) has a square structure, and its bottom is connected to the top of the second base plate (2). The width of the rubber pad (3) is smaller than the width of the second base plate (2).

2. A spherical support for preventing radial cumulative creep of curved bridges according to claim 1, characterized in that: The radius r of the sphere (21) ranges from , where R is the radius of the curved bridge deck.

3. A spherical support for preventing radial cumulative creep of curved bridges according to claim 2, characterized in that: The bottom of the first base plate (1) is connected to the top of the bridge cap beam (6), and the top of the rubber pad (3) is connected to the bottom of the bridge superstructure (7). The top of the bridge cap beam (6) and the bottom of the bridge superstructure (7) are respectively provided with insertion slots (8) for the bottom of the first base plate (1) and the top of the rubber pad (3).

4. A spherical support for preventing radial cumulative creep of curved bridges according to claim 3, characterized in that: The outer walls of the rubber pad (3) and the first base plate (1) are respectively connected to an upper fixing plate (9) and a lower fixing plate (10). The upper fixing plate (9) and the lower fixing plate (10) are square in shape. The middle of the two is provided with an upper connecting hole (11) and a lower connecting hole (12) with the same width as the rubber pad (3) and the first base plate (1). The inner walls of the upper connecting hole (11) and the lower connecting hole (12) are respectively connected to the outer walls of the rubber pad (3) and the first base plate (1). The four corners of the upper fixing plate (9) and the lower fixing plate (10) are provided with mounting holes (13).

5. A spherical support for preventing radial cumulative creep of a curved bridge according to claim 4, characterized in that: The distance from the upper surface of the upper fixing plate (9) to the upper surface of the rubber pad (3) is equal to the depth of the bottom insertion groove (8) of the bridge superstructure (7); the distance between the lower surface of the lower fixing plate (10) and the lower surface of the first bottom plate (1) is equal to the depth of the top insertion groove (8) of the bridge cap beam (6).

6. A spherical support for preventing radial cumulative creep of a curved bridge according to claim 5, characterized in that: The bottom left and right sides of the upper fixing plate (9) are provided with square connecting blocks (14). The bottom of the connecting blocks (14) is connected to a pull plate (15) by bolts. The outer wall of the pull plate (15) is flush with the outer wall of the connecting block (14). The width of the pull plate (15) is greater than the width of the connecting block (14). The upper left and right sides of the outer wall of the first base plate (1) are provided with pull plate limiting blocks (16). In the vertical direction, the inner end of the pull plate (15) is located between the bottom of the pull plate limiting block (16) and the top of the left and right ends of the lower fixing plate (10). There are gaps between the pull plate (15), the pull plate limiting block (16), and the lower fixing plate (10).

7. A spherical support for preventing radial cumulative creep of a curved bridge according to claim 6, characterized in that: The left and right side walls of the lower fixing plate (10) are connected to the connecting plate (17) by bolts. The outer walls of the connecting plate (17) are provided with connecting columns (18). The outer ends of the connecting columns (18) are flush with the left and right side walls of the upper fixing plate (9). The ends of the connecting columns (18) and the left and right side walls of the upper fixing plate (9) are provided with threaded holes for connecting vertical connecting rods (19). The upper and lower ends of the vertical connecting rods (19) are provided with through holes for connecting bolts (20) to pass through. The connecting bolts (20) pass through the through holes and are threadedly connected to the threaded holes.

Images