An anti-seismic and shock-absorbing device suitable for a self-anchored suspension bridge

Abstract

The application discloses a kind of anti-seismic damping devices suitable for self-anchored suspension bridge in the technical field of self-anchored suspension bridge, including several bridge towers, bridge deck is fixedly supported between two adjacent bridge towers, first suspension cable for pulling bridge deck is fixedly connected between two bridge towers, locking plate is arranged at the bottom of each bridge tower, and the top of locking plate is fixedly connected with a plurality of first gas springs;The application is automatically detected by using detection mechanism when earthquake occurs each time, then the contact between positioning rod, top block and bridge tower is disconnected by controlling disengagement mechanism, the gap between bridge tower and locking plate is first given, the space for locking plate to vibrate up and down is given, the bridge tower is secondly supported by first spring, when bottom locking plate vibrates, the stability of bridge deck is ensured as much as possible, the suspension bridge is anti-seismic and damped, and the damage to suspension bridge during earthquake is avoided.

Description

Technical Field

[0001] This invention relates to the field of self-anchored suspension bridge technology, specifically to a seismic damping device suitable for self-anchored suspension bridges. Background Technology

[0002] Self-anchored suspension bridges typically consist of a main girder (stiffening girder), towers, main cables, suspenders, main cable saddles, and auxiliary cable saddles. They do not require strong anchorages; the main cables are directly anchored to the ends of the main girder, also known as the stiffening girder, saving on expensive anchorage costs. Simultaneously, the main cables apply strong free prestress to the main girder, greatly improving the structural stress distribution of the main girder.

[0003] The main function of existing self-aiming suspension bridge towers is to support the main cable and ensure the stability of the bridge under wind and seismic loads. As the most important load-bearing structure of a suspension bridge, the stability of the towers is crucial during earthquakes. Adjacent towers support the horizontal bridge. If the towers vibrate violently during an earthquake, it will cause strong bending and shear damage to the bridge body, which can easily damage the suspension bridge. Therefore, there is an urgent need for a device that can automatically activate to resist earthquakes and reduce vibrations in the upper part of the towers during earthquakes.

[0004] Based on this, the present invention designs an anti-seismic and damping device suitable for self-anchored suspension bridges to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a seismic damping device suitable for self-anchored suspension bridges, in order to solve the problem mentioned in the background art. The main function of the bridge towers of the existing self-anchored suspension bridges is to support the main cable and ensure the stability of the bridge under wind and seismic loads. As the most important load-bearing structure of the suspension bridge, the stability of the bridge towers is very important during earthquakes. The bridge towers support the horizontal bridge between adjacent towers. If the towers vibrate violently during an earthquake, it will cause strong bending and shear damage to the bridge body, which can easily damage the suspension bridge. Therefore, there is an urgent need for a device that can automatically activate to dampen the upper part of the bridge towers during an earthquake.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a seismic damping device suitable for self-anchored suspension bridges, comprising several bridge towers, a bridge deck fixedly supported between two adjacent bridge towers, a first suspension cable for pulling the bridge deck fixedly connected between the two bridge towers, a locking plate provided at the bottom of each bridge tower, several first gas springs fixedly connected to the top of the locking plate, a first vibration plate fixedly connected to the top of the several first gas springs, the first vibration plate fixedly connected to the outer surface of the bridge tower, two top blocks provided at the top of the locking plate, the top blocks being located below the support feet of the bridge tower for supporting the bridge tower, two sets of first connecting plates fixedly connected to the top of the locking plate, each set of two first connecting plates being located on the left and right sides of the support feet of the bridge tower, a positioning rod slidably connected through the interior of each set of two first connecting plates, the positioning rod penetrating the support feet of the bridge tower, a detection mechanism for detecting earthquakes provided at the bottom of the locking plate, and a disengagement mechanism connected to the top of the locking plate for disengaging the two positioning rods and top blocks on the same side from contact with the bridge tower when the detection mechanism is activated;

[0007] The disengagement mechanism includes two first gears, which are rotatably connected to the outer side wall of the first connecting plate. The positioning rod is a threaded rod that passes through the first gear and is threadedly connected to it. A first rotating rod is rotatably connected to the top of the locking plate. A second gear is fixedly connected to the left end of the first rotating rod. The second gear is connected to the two first gears through a first toothed chain. The detection mechanism is used to drive the first rotating rod to rotate. A pulling mechanism for moving the two top blocks inward is connected to the top of the locking plate.

[0008] The pulling mechanism includes a first rack, which is slidably connected to the top of the locking plate and fixedly connected to the inner side wall of the top block. A third gear is fixedly connected to the outer surface of the first rotating rod, and the first rack meshes with the bottom of the third gear. A second rack is fixedly connected to the inner side wall of the other top block through an L-shaped connecting bracket, and the second rack meshes with the top of the third gear.

[0009] The detection mechanism includes a second gas spring, which is fixedly connected to the bottom of the locking plate. A detection plate is fixedly connected to the bottom end of the second gas spring. The detection plate is used to fit against the ground to detect earthquakes. A third rack is fixedly connected to the top of the detection plate. The top end of the third rack passes through the locking plate and is slidably connected to it. A fourth gear is fixedly connected to the outer surface of the first rotating rod. The fourth gear meshes with the third rack.

[0010] Two first sliding rods are fixedly connected to the left and right side walls of each locking plate. A first slider is sleeved on the outer surface of each first sliding rod. The inner side wall of the first slider contacts the outer side wall of the locking plate. A second suspension cable is fixedly connected between the two first sliders on the same side. The second suspension cable is fixedly connected to the bottom of the bridge deck. A tensioning mechanism for pulling down the second suspension cable when vibrating is connected to the bottom of each first slider.

[0011] The tensioning mechanism includes a first pull rope, one end of which is fixedly connected to the bottom of the first slider, and the other end of which passes through the locking plate and is fixedly connected to the bottom of the second and third racks. A first spring for supporting the first slider is sleeved on the outer surface of each first slider.

[0012] Each of the locking plates has a first groove at its bottom. The third rack is located inside the first groove. Each of the third racks has a ratchet fixedly connected to its outer side wall. A third gas spring is fixedly connected to the inner side wall of the first groove. A positioning plate is fixedly connected to the protruding end of the third gas spring. The inner end of the positioning plate contacts the ratchet to prevent the third rack from falling.

[0013] A second pull rope is fixedly connected to the inner side wall of each positioning plate. The top of the second pull rope is located at the top of the bridge deck. The second pull rope is slidably connected to the side wall of the bridge tower. The second pull rope is used to pull the positioning plate outward to move it outward.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. This invention first automatically detects an earthquake using a detection mechanism, and then controls a disengagement mechanism to detach the positioning rod and top block from the bridge tower. First, it creates a gap between the bridge tower and the locking plate, providing space for the locking plate to vibrate up and down. Second, it transforms into a first spring to assist in supporting the bridge tower. When the bottom locking plate vibrates, it ensures the stability of the bridge deck as much as possible, thereby providing seismic resistance and vibration reduction for the suspension bridge and preventing damage to the suspension bridge during earthquakes.

[0016] 2. This invention, when an earthquake is detected by the detection mechanism, drives the first rotating rod to rotate, which in turn drives the second gear to rotate. The second gear, through the first gear chain, drives the two first gears to rotate synchronously, thereby simultaneously driving the two positioning rods to move outward and pull the positioning rods out of the bridge tower. At the same time, the first rotating rod drives the third gear to rotate, driving the first rack and the second rack to move inward synchronously, thereby simultaneously pulling the two top blocks arranged in front and behind inward, causing the two top blocks to detach from the bottom of the bridge tower, preventing the bridge tower from contacting the locking plate. This achieves the separation of the bridge tower from the locking plate during an earthquake. The locking plate is only connected to the bridge tower through the first gas spring, providing earthquake resistance and vibration reduction for the bridge tower and protecting the stability of the suspension bridge. Attached Figure Description

[0017] Figure 1 This is a first perspective view of the overall structure of the present invention;

[0018] Figure 2 This is a second perspective view of the overall structure of the present invention;

[0019] Figure 3 for Figure 2 Enlarged view of the structure at point A in the middle;

[0020] Figure 4 This is a schematic diagram of the bridge tower, locking plate, and its top structure of the present invention;

[0021] Figure 5 This is a schematic diagram showing the positions and structure of the first rack, second rack, first rotating rod, and third gear of the present invention.

[0022] Figure 6 This is a schematic diagram of the bottom detection plate of the locking plate of the present invention;

[0023] Figure 7 for Figure 6 Enlarged view of the structure at point B in the middle;

[0024] Figure 8 This is a schematic diagram showing the connection relationship between the second pull rope and the positioning plate of the present invention, and a schematic diagram showing the connection relationship between the first slider, the first pull rope, the first rack, and the second rack.

[0025] The attached diagram lists the components represented by each number as follows:

[0026] Bridge tower 1, bridge deck 2, first suspension cable 3, locking plate 4, first gas spring 5, first vibration plate 6, top block 7, first connecting plate 8, positioning rod 9, first gear 10, first rotating rod 11, second gear 12, first gear chain 13, first rack 14, third gear 15, second rack 16, second gas spring 17, detection plate 18, third rack 19, fourth gear 20, first sliding rod 21, first slider 22, second suspension cable 23, first pull rope 24, first spring 25, first groove 26, ratchet 27, third gas spring 28, positioning plate 29, second pull rope 30. Detailed Implementation

[0027] Please see Figure 1-8This invention provides a technical solution: a seismic damping device suitable for self-anchored suspension bridges, comprising several bridge towers 1, a bridge deck 2 fixedly supported between two adjacent bridge towers 1, a first suspension cable 3 for pulling the bridge deck 2 fixedly connected between two bridge towers 1, a locking plate 4 provided at the bottom of each bridge tower 1, several first gas springs 5 ​​fixedly connected to the top of the locking plate 4, a first vibration plate 6 fixedly connected to the top of the several first gas springs 5, the first vibration plate 6 fixedly connected to the outer surface of the bridge tower 1, and two top blocks 7 provided at the top of the locking plate 4. The top block 7 is located below the support foot of the bridge tower 1 to support the bridge tower 1. The top of the locking plate 4 is fixedly connected to two sets of first connecting plates 8. Each set of two first connecting plates 8 is located on the left and right sides of the support foot of the bridge tower 1 respectively. Each set of two first connecting plates 8 has a positioning rod 9 that is slidably connected to it. The positioning rod 9 passes through the support foot of the bridge tower 1. The bottom of the locking plate 4 is provided with a detection mechanism for detecting earthquakes. The top of the locking plate 4 is connected to a disengagement mechanism for disengaging the two positioning rods 9 and the top block 7 on the same side from contact with the bridge tower 1 when the detection mechanism is activated.

[0028] During normal operation, the locking plate 4 is fixed to the bottom surface, and the top block 7 is located below the support leg of the bridge tower 1 to support the bridge tower 1. The top block 7, together with the positioning rod 9, tightly connects the bridge tower 1 and the locking plate 4, thereby ensuring the stability of the suspension bridge during normal operation. When an earthquake occurs, the detection mechanism first detects the vertical vibration of the ground. Then, the release mechanism drives the two positioning rods 9 to move outward, pulling the positioning rods 9 out of the bridge tower 1. At the same time, the release mechanism drives the two top blocks 7 to move inward, causing the top blocks 7 to detach from the bottom of the bridge tower 1, creating a distance between the bottom of the bridge tower 1 and the locking plate, providing space for subsequent vertical vibrations on the locking plate. After the top blocks 7 and positioning rods 9 detach from the bridge tower 1, the bridge tower 1 falls onto the first gas spring 5 via the first vibration plate 6. When the ground continues to vibrate, the locking plate fixed to the ground is driven to vibrate up and down. The first gas spring 5 dampens the bridge tower 1 at the top, preventing the bridge tower 1 from vibrating violently and avoiding violent vibration of the bridge deck 2, thus protecting the bridge deck 2. This is convenient and quick, so that in each earthquake, the detection mechanism automatically detects the earthquake, and then controls the release mechanism to separate the positioning rod 9 and the top block 7 from the bridge tower 1. First, a gap is provided between the bridge tower 1 and the locking plate to give the locking plate room to vibrate up and down. Second, the first spring 25 assists in supporting the bridge tower 1. When the bottom locking plate vibrates, it tries to ensure the stability of the bridge deck 2, and performs seismic damping on the suspension bridge to avoid damage to the suspension bridge in the event of an earthquake.

[0029] As a further embodiment of the present invention, the disengagement mechanism includes two first gears 10, which are rotatably connected to the outer side wall of the first connecting plate 8 respectively. The positioning rod 9 is a threaded rod that passes through the first gear 10 and is threadedly connected to it. The top of the locking plate 4 is rotatably connected to a first rotating rod 11. The left end of the first rotating rod 11 is fixedly connected to a second gear 12. The second gear 12 is connected to the two first gears 10 through a first toothed chain 13. The detection mechanism is used to drive the first rotating rod 11 to rotate. The top of the locking plate 4 is connected to a pulling mechanism for moving the two top blocks 7 inward.

[0030] The pulling mechanism includes a first rack 14, which is slidably connected to the top of the locking plate 4 and fixedly connected to the inner wall of the top block 7. A third gear 15 is fixedly connected to the outer surface of the first rotating rod 11. The first rack 14 meshes with the bottom of the third gear 15. A second rack 16 is fixedly connected to the inner wall of another top block 7 through an L-shaped connecting bracket. The second rack 16 meshes with the top of the third gear 15.

[0031] During operation, to detach the two positioning rods 9 and the top block 7 from the bridge tower 1 during an earthquake, the detection mechanism drives the first rotating rod 11 to rotate when an earthquake is detected. This drives the second gear 12 to rotate, and the second gear 12 drives the two first gears 10 to rotate synchronously through the first gear chain 13. This simultaneously drives the two positioning rods 9 to move outward, pulling the positioning rods 9 out of the bridge tower 1. At the same time, the first rotating rod 11 drives the third gear 15 to rotate, driving the first rack 14 and the second rack 16 to move inward synchronously. This simultaneously pulls the two top blocks 7 arranged in front and behind inward, causing the two top blocks 7 to detach from the bottom of the bridge tower 1, preventing the bridge tower 1 from contacting the locking plate. This achieves the detachment of the bridge tower 1 from the locking plate during an earthquake. The locking plate is only connected to the bridge tower 1 through the first gas spring 5, providing earthquake resistance and vibration reduction for the bridge tower 1 and protecting the stability of the suspension bridge.

[0032] As a further embodiment of the present invention, the detection mechanism includes a second gas spring 17, which is fixedly connected to the bottom of the locking plate 4. A detection plate 18 is fixedly connected to the bottom end of the second gas spring 17. The detection plate 18 is used to fit against the bottom surface to detect earthquakes. A third rack 19 is fixedly connected to the top of the detection plate 18. The top end of the third rack 19 passes through the locking plate 4 and is slidably connected to it. A fourth gear 20 is fixedly connected to the outer surface of the first rotating rod 11. The fourth gear 20 meshes with the third rack 19. During operation, since it is necessary to detect vibrations in time and drive the first rotating rod 11 to rotate, when an earthquake occurs, the detection plate 18 in contact with the ground will be triggered first, causing the detection plate 18 to vibrate up and down significantly. When the detection plate 18 vibrates upward, it drives the third rack 19 to move upward synchronously, driving the fourth gear 20 and the first rotating rod 11 to rotate rapidly, thereby detecting the earthquake in time and driving the first rotating rod 11 to rotate in time. This is convenient and fast, and does not require electric drive. It is suitable for use on long-distance suspension bridges, greatly saving costs.

[0033] As a further embodiment of the present invention, two first sliding rods 21 are fixedly connected to the left and right side walls of each locking plate 4. A first slider 22 is sleeved on the outer surface of each first sliding rod 21. The inner side wall of the first slider 22 contacts the outer side wall of the locking plate 4. A second suspension cable 23 is fixedly connected between the two first sliders 22 on the same side. The second suspension cable 23 is fixedly connected to the bottom of the bridge deck 2. A tensioning mechanism for pulling down the second suspension cable 23 when vibrating is connected to the bottom of each first slider 22.

[0034] The tensioning mechanism includes a first pull rope 24, one end of which is fixedly connected to the bottom of the first slider 22, and the other end passes through the locking plate 4 and is fixedly connected to the bottom of the second rack 16 and the third rack 19. A first spring 25 for supporting the first slider 22 is sleeved on the outer surface of each first slide bar 21.

[0035] During operation, even after the bridge tower 1 is damped by the first gas spring 5, small vibrations may still occur, potentially affecting the bridge deck 2. In the event of an earthquake, the second rack 16 and the third rack 19 move inwards, causing the first slider 22 to move downwards along the first slide bar 21 via the first pull rope 24. The two first sliders 22 on the same side move downwards, simultaneously pulling down the second suspension cable 23. The second suspension cable 23 tightens the bridge deck 2 downwards from the bottom, working in conjunction with the first suspension cable 3 tightening the bridge deck 2 upwards from the top, thereby enhancing the stability of the bridge deck 2 and preventing damage. When no earthquake occurs, the first spring 25 supports the first slider 22 at a high position, preventing the second suspension cable 23 from pulling on the bottom of the bridge deck 2 and thus avoiding affecting the tension of the first suspension cable 3, which helps improve the strength of the suspension bridge.

[0036] As a further embodiment of the present invention, each locking plate 4 has a first groove 26 at its bottom, a third rack 19 is located inside the first groove 26, and a ratchet 27 is fixedly connected to the outer wall of each third rack 19. A third gas spring 28 is fixedly connected to the inner wall of the first groove 26, and a positioning plate 29 is fixedly connected to the protruding end of the third gas spring 28. The inner end of the positioning plate 29 contacts the ratchet 27 to prevent the third rack 19 from falling. During operation, since the detection plate 18 may detect an earthquake during operation, the detection plate 18 may... The up-and-down vibration may cause the positioning rod 9 and the top block 7 to move back and forth, which is not conducive to the seismic resistance of the bridge deck 2. By using the ratchet 27 set on the outside of each fourth rack, the third gas spring 28 presses the inner end of the positioning plate 29 tightly against the ratchet 27. When the detection plate 18 detects ground vibration and vibrates up and down, when the detection plate 18 moves upward, the ratchet 27 pushes the positioning plate 29 to move upward. The positioning plate 29 prevents the fourth rack from moving downward, avoiding the up-and-down vibration of the detection plate 18 during an earthquake, which is beneficial to the seismic resistance of the suspension bridge.

[0037] As a further embodiment of the present invention, a second pull rope 30 is fixedly connected to the inner wall of each positioning plate 29. The top of the second pull rope 30 is located at the top of the bridge deck 2, and the second pull rope 30 is slidably connected to the side wall of the bridge tower 1. The second pull rope 30 is used to pull the positioning plate 29 outward. During operation, since the positioning rod 9 and the top block 7 need to be reset to the bottom of the bridge tower 1 to provide stable support after the earthquake, it is necessary to reset the fourth rack after each earthquake. By having personnel pull the second pull rope 30 inward on the bridge deck 2, the positioning plate 29 at the bottom moves outward, causing the positioning plate 29 to disengage from the ratchet 27. The fourth rack is reset under the action of the second gas spring 17, thereby resetting the positioning rod 9 and the top block 7, which is convenient and quick.

Claims

1. A seismic damping device suitable for self-anchored suspension bridges, comprising a plurality of bridge towers (1), a bridge deck (2) fixedly supported between two adjacent bridge towers (1), and a first suspension cable (3) for pulling the bridge deck (2) fixedly connected between the two bridge towers (1), characterized in that: Each bridge tower (1) is provided with a locking plate (4) at its bottom. Several first gas springs (5) are fixedly connected to the top of the locking plate (4). The tops of the several first gas springs (5) are fixedly connected to a first vibration plate (6). The first vibration plate (6) is fixedly connected to the outer surface of the bridge tower (1). Two top blocks (7) are provided on the top of the locking plate (4). The top blocks (7) are located below the support legs of the bridge tower (1) to support the bridge tower (1). Two sets of first... The connecting plate (8) has two first connecting plates (8) in each group located on the left and right sides of the support foot of the bridge tower (1). Each pair of first connecting plates (8) has a positioning rod (9) that is slidably connected to it. The positioning rod (9) passes through the support foot of the bridge tower (1). The bottom of the locking plate (4) is provided with a detection mechanism for detecting earthquakes. The top of the locking plate (4) is connected with a disengagement mechanism for disengaging the two positioning rods (9) and the top block (7) on the same side from contact with the bridge tower (1) when the detection mechanism is activated.

2. The seismic damping device for self-anchored suspension bridges according to claim 1, characterized in that: The disengagement mechanism includes two first gears (10), which are rotatably connected to the outer side wall of the first connecting plate (8). The positioning rod (9) is a threaded rod that passes through the first gear (10) and is threadedly connected to it. The top of the locking plate (4) is rotatably connected to a first rotating rod (11). The left end of the first rotating rod (11) is fixedly connected to a second gear (12). The second gear (12) is connected to the two first gears (10) through a first toothed chain (13). The detection mechanism is used to drive the first rotating rod (11) to rotate. The top of the locking plate (4) is connected to a pulling mechanism for moving the two top blocks (7) inward.

3. The seismic damping device for self-anchored suspension bridges according to claim 2, characterized in that: The pulling mechanism includes a first rack (14), which is slidably connected to the top of the locking plate (4) and fixedly connected to the inner wall of the top block (7). A third gear (15) is fixedly connected to the outer surface of the first rotating rod (11). The first rack (14) meshes with the bottom of the third gear (15). A second rack (16) is fixedly connected to the inner wall of the other top block (7) through an L-shaped connecting bracket. The second rack (16) meshes with the top of the third gear (15).

4. The seismic damping device for self-anchored suspension bridges according to claim 2, characterized in that: The detection mechanism includes a second gas spring (17), which is fixedly connected to the bottom of the locking plate (4). A detection plate (18) is fixedly connected to the bottom end of the second gas spring (17). The detection plate (18) is used to fit against the ground to detect earthquakes. A third rack (19) is fixedly connected to the top of the detection plate (18). The top end of the third rack (19) passes through the locking plate (4) and is slidably connected to it. A fourth gear (20) is fixedly connected to the outer surface of the first rotating rod (11). The fourth gear (20) meshes with the third rack (19).

5. A seismic damping device suitable for self-anchored suspension bridges according to claim 1, characterized in that: Two first sliding rods (21) are fixedly connected to the left and right side walls of each locking plate (4). A first slider (22) is sleeved on the outer surface of each first sliding rod (21). The inner side wall of the first slider (22) is in contact with the outer side wall of the locking plate (4). A second suspension cable (23) is fixedly connected between the two first sliders (22) on the same side. The second suspension cable (23) is fixedly connected to the bottom of the bridge deck (2). A tensioning mechanism for pulling down the second suspension cable (23) when vibrating is connected to the bottom of each first slider (22).

6. A seismic damping device suitable for self-anchored suspension bridges according to claim 5, characterized in that: The tensioning mechanism includes a first pull rope (24), one end of which is fixedly connected to the bottom of the first slider (22), and the other end passes through the locking plate (4) and is fixedly connected to the bottom of the second rack (16) and the third rack (19). A first spring (25) for supporting the first slider (22) is sleeved on the outer surface of each first slide bar (21).

7. A seismic damping device suitable for self-anchored suspension bridges according to claim 4, characterized in that: Each locking plate (4) has a first groove (26) at its bottom. The third rack (19) is located inside the first groove (26). Each third rack (19) has a ratchet (27) fixedly connected to its outer side wall. A third gas spring (28) is fixedly connected to the inner side wall of the first groove (26). A positioning plate (29) is fixedly connected to the protruding end of the third gas spring (28). The inner end of the positioning plate (29) contacts the ratchet (27) to prevent the third rack (19) from falling.

8. A seismic damping device suitable for self-anchored suspension bridges according to claim 7, characterized in that: A second pull rope (30) is fixedly connected to the inner wall of each positioning plate (29). The top of the second pull rope (30) is located at the top of the bridge deck (2). The second pull rope (30) is slidably connected to the side wall of the bridge tower (1). The second pull rope (30) is used to pull the positioning plate (29) outward.

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