A seismic mitigation and isolation structure applied to a fabricated beam bridge and a method thereof

Abstract

This invention relates to the field of bridges and discloses a seismic isolation structure for prefabricated beam bridges. This invention addresses the problem that dampers generate significant impact force due to direct impact, and that the damping coefficient of the damper is fixed, making adjustments during installation impossible and requiring multiple dampers as backups. By incorporating a rotating mechanism, the support rod rotates to the outside of the first push rod during an earthquake, thus extending the extension and retraction time of the first push rod and reducing the impact force. Compared to existing technologies, the longer rotation time of the support rod compared to direct insertion results in a smaller impact force, thereby achieving the goal of reducing impact force.

Description

Technical Field

[0001] This invention relates to the field of bridges, specifically to a seismic isolation and damping structure and method for prefabricated beam bridges. Background Technology

[0002] The seismic isolation structure of a beam bridge is a structure that reduces the vibration of the bridge during an earthquake. Its main purpose is to reduce the impact of the earthquake on the bridge itself. For example, in the patent with publication number CN206157558U, the seismic energy input from the beam to the pier and foundation through the supports during an earthquake is huge. The relative motion speed and displacement of the beam and the pier are relatively large. The liquid viscous damper and the hyperboloid spherical seismic isolation bearing play a significant role in vibration reduction and energy dissipation. After the earthquake, the hyperboloid spherical seismic isolation bearing provides a certain degree of beam reset function.

[0003] Patent CN206157558U discloses a combined structure of dampers and seismic isolation bearings for long-span continuous beam bridges. The seismic resistance problem of long-span continuous beam bridges in high-intensity earthquake zones urgently needs to be solved. Existing seismic isolation structures for beam bridges generally install dampers at the bottom of the bridge to dissipate kinetic energy. However, the impact of these dampers is a direct impact, generating a large impact force. Furthermore, the damping coefficient of the dampers is fixed and cannot be adjusted according to on-site needs during installation; therefore, multiple dampers need to be prepared as backups. Summary of the Invention

[0004] The purpose of this invention is to provide a seismic isolation structure and method for prefabricated beam bridges. By using this device, the problems of dampers causing direct impacts with large impact forces, and the fixed damping coefficient of dampers which cannot be adjusted according to on-site needs during installation, necessitating the preparation of multiple dampers as backups, are solved.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a vibration reduction and isolation structure for prefabricated beam bridges, comprising a bridge deck, a connecting rod disposed below the bridge deck, a first push rod disposed below the connecting rod, a support rod disposed below the first push rod, a first groove disposed inside the support rod, a first damping medium disposed below the inner side of the first groove, a rotating mechanism disposed above the inner side of the first groove, and a threaded mechanism disposed outside the rotating mechanism.

[0006] The rotating mechanism includes a guide rod disposed on the outside of the first push rod, a first limiting groove connected to the outside of the first groove, a first support plate disposed below the first push rod, a limiting plate disposed below the first support plate, a second support plate disposed below the limiting plate, a second limiting groove disposed inside the second support plate, and a first hole connected to the top of the first groove.

[0007] Preferably, the connection between the connecting rod and the first push rod is a ring-shaped sliding connection, and the connection between the first push rod and the first support plate is a fixed connection.

[0008] Preferably, the width of the guide rod is the same as the width of the first limiting groove, the first limiting groove has a wavy shape, and the guide rod and the first push rod are connected in a fixed manner.

[0009] Preferably, the width of the first hole is the same as the width of the first push rod, and the width of the first groove is greater than the width of the first hole.

[0010] Preferably, the connection between the limiting plate and the first support plate is a fixed connection, and the width of the limiting plate is the same as the width of the second limiting groove.

[0011] Preferably, the outer side of the first groove is connected to a second hole, and the threaded mechanism includes a second push rod disposed inside the second hole, a second damping medium disposed inside the second push rod, a connecting plate disposed above the second push rod, and a threaded rod disposed inside the connecting plate.

[0012] Preferably, the width of the second hole is the same as the width of the second push rod, and the external structural shape of the second push rod is rectangular.

[0013] Preferably, the connection between the connecting plate and the threaded rod is a threaded connection, and the threads at both ends of the threaded rod have opposite directions of rotation.

[0014] Preferably, the vibration reduction method for the vibration isolation structure is characterized by comprising the following steps:

[0015] S1. When an earthquake occurs, the support rod is pushed to move outward from the first push rod;

[0016] S2. The support rod moves along the trajectory of the first limiting groove, thereby increasing the time it takes for the support rod to move to the outside of the first push rod, thus reducing the impact force.

[0017] S3. Rotate the threaded rod. Rotating the threaded rod will drive the connecting plate and the second push rod to move towards the center, which in turn will drive the second damping medium to move towards the center.

[0018] S4. This causes the second damping medium to have different degrees of contact with the first push rod, resulting in different damping coefficients. Therefore, the damping coefficient can be adjusted according to the site conditions.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. The present invention proposes a seismic isolation structure for prefabricated beam bridges. By setting a rotating mechanism, the support rod will rotate to the outside of the first push rod during an earthquake, thereby prolonging the extension and retraction time of the first push rod and reducing the impact force. Compared with the prior art, the support rod takes longer to rotate into the ground than to directly enter the ground, resulting in a smaller impact force, thus achieving the purpose of reducing the impact force.

[0021] 2. The present invention proposes a vibration reduction and isolation structure for prefabricated beam bridges. By setting a threaded mechanism, rotating the threaded mechanism changes the damping coefficient of the first push rod, allowing the damping coefficient to be adjusted according to the site conditions. Compared with the prior art, it eliminates the need to carry multiple dampers with different damping coefficients, thus achieving the purpose of convenient use. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0023] Figure 2 This is a three-dimensional structural diagram of the support rod of the present invention;

[0024] Figure 3 This is a three-dimensional cross-sectional view of the support rod of the present invention;

[0025] Figure 4 This is a three-dimensional structural diagram of the first limiting groove of the present invention;

[0026] Figure 5 This is a three-dimensional cross-sectional view of the first support plate of the present invention.

[0027] In the diagram: 1. Bridge deck; 2. First push rod; 3. Support rod; 4. First groove; 5. First damping medium; 6. Rotating mechanism; 7. Threaded mechanism; 8. Connecting rod; 601. Guide rod; 602. First limiting groove; 603. First support plate; 604. Limiting plate; 605. Second support plate; 606. Second limiting groove; 607. First hole; 701. Second hole; 702. Second push rod; 703. Second damping medium; 704. Connecting plate; 705. Threaded rod. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figures 1-5The present invention provides a technical solution: a vibration reduction and isolation structure for prefabricated beam bridges, comprising a bridge deck 1, a connecting rod 8 disposed below the bridge deck 1, a first push rod 2 disposed below the connecting rod 8, a support rod 3 disposed below the first push rod 2, a first groove 4 disposed inside the support rod 3, a first damping medium 5 disposed on the inner side below the first groove 4, a rotating mechanism 6 disposed on the inner side above the first groove 4, and a threaded mechanism 7 disposed on the outer side of the rotating mechanism 6.

[0030] The rotating mechanism 6 includes a guide rod 601 disposed on the outside of the first push rod 2, a first limiting groove 602 connected to the outside of the first groove 4, a first support plate 603 disposed below the first push rod 2, a limiting plate 604 disposed below the first support plate 603, a second support plate 605 disposed below the limiting plate 604, a second limiting groove 606 disposed inside the second support plate 605, and a first hole 607 connected to the top of the first groove 4.

[0031] The connecting rod 8 and the first push rod 2 are connected by a ring sliding connection, and the first push rod 2 and the first support plate 603 are connected by a fixed connection.

[0032] The width of the guide rod 601 is the same as the width of the first limiting groove 602, and the appearance structure of the first limiting groove 602 is wavy. The guide rod 601 and the first push rod 2 are connected in a fixed manner.

[0033] The width of the first hole 607 is the same as the width of the first push rod 2, and the width of the first groove 4 is greater than the width of the first hole 607.

[0034] The limiting plate 604 is fixedly connected to the first support plate 603, and the width of the limiting plate 604 is the same as the width of the second limiting groove 606.

[0035] The outer side of the first groove 4 is connected to the second hole 701. The threaded mechanism 7 includes a second push rod 702 disposed inside the second hole 701, a second damping medium 703 disposed inside the second push rod 702, a connecting plate 704 disposed above the second push rod 702, and a threaded rod 705 disposed inside the connecting plate 704.

[0036] The width of the second hole 701 is the same as the width of the second push rod 702, and the external structural shape of the second push rod 702 is rectangular.

[0037] The connection between the connecting plate 704 and the threaded rod 705 is a threaded connection, and the threads at both ends of the threaded rod 705 have opposite directions of rotation.

[0038] A vibration reduction method for a seismic isolation structure applied to prefabricated beam bridges includes the following steps:

[0039] S1. When an earthquake occurs, the support rod 3 is pushed to move outward from the first push rod 2;

[0040] S2, the support rod 3 moves along the trajectory of the first limiting groove 602, thereby increasing the time for the support rod 3 to move to the outside of the first push rod 2, thus achieving the purpose of reducing the impact force;

[0041] S3. Rotate the threaded rod 705. Rotating the threaded rod 705 drives the connecting plate 704 and the second push rod 702 to move towards the center, thereby driving the second damping medium 703 to move towards the center.

[0042] S4. This causes the second damping medium 703 to have different degrees of contact with the first push rod 2, resulting in different damping coefficients. The damping coefficient can then be adjusted according to the site conditions.

[0043] When an earthquake occurs, the support rod 3 is pushed to move outwards towards the first push rod 2. Because the connection between the connecting rod 8 and the first push rod 2 is a ring-shaped sliding connection, and the connection between the first push rod 2 and the first support plate 603 is a fixed connection, the width of the guide rod 601 is the same as the width of the first limiting groove 602, and the appearance structure of the first limiting groove 602 is wavy, and the connection between the guide rod 601 and the first push rod 2 is a fixed connection, the support rod 3 moves along the trajectory of the first limiting groove 602, thereby increasing the time for the support rod 3 to move to the outside of the first push rod 2. According to momentum quantification, the longer the impact time, the smaller the impact force. Compared with the prior art, the time for the support rod 3 to rotate into the ground is longer than the time for direct entry, resulting in a smaller impact force, thereby achieving the purpose of reducing the impact force.

[0044] By rotating the threaded rod 705, since the connection between the connecting plate 704 and the threaded rod 705 is a threaded connection, and the threads at both ends of the threaded rod 705 rotate in opposite directions, the width of the second hole 701 is the same as the width of the second push rod 702, and the external structural shape of the second push rod 702 is rectangular, rotating the threaded rod 705 causes the connecting plate 704 and the second push rod 702 to move towards the center, thereby causing the second damping medium 703 to move towards the center. This results in different degrees of contact between the second damping medium 703 and the first push rod 2, producing different damping coefficients. This allows for the adjustment of the damping coefficient according to the site conditions. Compared with existing technologies, it eliminates the need to carry multiple dampers with different damping coefficients, thus achieving the purpose of convenient use.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0046] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A seismic isolation structure for prefabricated beam bridges, comprising a bridge deck (1), a connecting rod (8) disposed below the bridge deck (1), a first push rod (2) disposed below the connecting rod (8), a support rod (3) disposed below the first push rod (2), a first groove (4) disposed inside the support rod (3), and a first damping medium (5) disposed on the inner side below the first groove (4), characterized in that: A rotating mechanism (6) is provided on the inner side above the first groove (4), and a threaded mechanism (7) is provided on the outer side of the rotating mechanism (6). The rotating mechanism (6) includes a guide rod (601) disposed on the outside of the first push rod (2), a first limiting groove (602) connected to the outside of the first groove (4), a first support plate (603) disposed below the first push rod (2), a limiting plate (604) disposed below the first support plate (603), a second support plate (605) disposed below the limiting plate (604), a second limiting groove (606) disposed inside the second support plate (605), and a first hole (607) connected to the top of the first groove (4). The width of the guide rod (601) is the same as the width of the first limiting groove (602), and the appearance structure of the first limiting groove (602) is wavy. The guide rod (601) and the first push rod (2) are connected in a fixed way. The outer side of the first groove (4) is connected to a second hole (701). The threaded mechanism (7) includes a second push rod (702) disposed inside the second hole (701), a second damping medium (703) disposed inside the second push rod (702), a connecting plate (704) disposed above the second push rod (702), and a threaded rod (705) disposed inside the connecting plate (704).

2. The seismic isolation and damping structure for prefabricated beam bridges according to claim 1, characterized in that: The connection between the connecting rod (8) and the first push rod (2) is a ring sliding connection, and the connection between the first push rod (2) and the first support plate (603) is a fixed connection.

3. The seismic isolation and damping structure for prefabricated beam bridges according to claim 1, characterized in that: The width of the first hole (607) is the same as the width of the first push rod (2), and the width of the first groove (4) is greater than the width of the first hole (607).

4. The seismic isolation and damping structure for prefabricated beam bridges according to claim 1, characterized in that: The limiting plate (604) and the first support plate (603) are connected by a fixed connection, and the width of the limiting plate (604) is the same as the width of the second limiting groove (606).

5. A seismic isolation and damping structure for prefabricated beam bridges according to claim 1, characterized in that: The width of the second hole (701) is the same as the width of the second push rod (702), and the appearance structure of the second push rod (702) is rectangular.

6. The seismic isolation and damping structure for prefabricated beam bridges according to claim 1, characterized in that: The connection between the connecting plate (704) and the threaded rod (705) is a threaded connection, and the threads at both ends of the threaded rod (705) have opposite directions of rotation.

7. A vibration reduction method for a vibration isolation structure applied to a prefabricated beam bridge according to claim 6, characterized in that: Includes the following steps: S1. When an earthquake occurs, push the support rod (3) to move outward of the first push rod (2); S2. The support rod (3) moves along the trajectory of the first limiting groove (602), thereby increasing the time for the support rod (3) to move to the outside of the first push rod (2), thus achieving the purpose of reducing the impact force. S3. Rotate the threaded rod (705). Rotating the threaded rod (705) will drive the connecting plate (704) and the second push rod (702) to move towards the center, thereby driving the second damping medium (703) to move towards the center. S4. This causes the second damping medium (703) to have different degrees of contact with the first push rod (2), resulting in different damping coefficients. Therefore, the damping coefficient can be adjusted according to the site conditions.

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