A device for reducing longitudinal vibration deformation at the end of a railway suspension bridge

Abstract

This invention discloses a device for reducing longitudinal vibration deformation at the end of a railway suspension bridge. It includes a temperature deformation release spring coil and one or more live load displacement control spring coils. If there is only one live load displacement control spring coil, its diameter is smaller than that of the temperature deformation release spring coil. If there are two or more live load displacement control spring coils, their diameters decrease sequentially. All live load displacement control spring coils are tangentially connected to the outer surfaces of the temperature deformation release spring coils. The tangential connection is connected to the abutment, and the temperature deformation release spring coil is connected to the main beam along the longitudinal direction of the bridge on the side corresponding to the tangential connection; alternatively, the tangential connection is connected to the main beam, and the temperature deformation release spring coil is connected to the abutment along the longitudinal direction of the bridge on the side corresponding to the tangential connection. This invention reduces longitudinal vibration deformation at the beam end under train loads and can release temperature deformation of the bridge structure.

Description

Technical Field

[0001] This invention relates to the field of vibration response control technology for railway suspension bridges, and in particular to a device for reducing longitudinal vibration deformation at the ends of railway suspension bridges. Background Technology

[0002] With the continuous development of long-span suspension bridges and the increasing demand for railway suspension bridges in mountainous areas, the longitudinal displacement of the beam ends of suspension bridges under train loads has attracted widespread attention. Long-span suspension bridges are mostly based on floating or semi-floating systems. Their advantages include structural flexibility, which is beneficial for earthquake resistance. However, their disadvantage is low longitudinal stiffness, making the main beam prone to longitudinal movement under external loads. Excessive cumulative longitudinal movement of the main beam of a suspension bridge can lead to performance degradation and fatigue failure of connecting components. Because train loads are continuous and regularly applied, railway suspension bridge beam ends experience significant longitudinal displacement under train loads, resulting in frequent beam end movement and deteriorating the working environment of the bridge's end expansion joints, supports, and cables.

[0003] Currently, most of the long-span suspension bridges built at home and abroad use liquid viscous dampers for longitudinal vibration reduction. However, conventional viscous dampers cannot effectively control the longitudinal movement of the beam ends under the action of daily operating trains. In order to control the longitudinal movement of the suspension bridge ends under the action of train loads, viscous dampers with a small velocity index (i.e., a velocity index of 0.1) must be used. Furthermore, due to the huge train loads, the longitudinal displacement of the suspension bridge ends is large, which brings about design difficulties for devices such as beam end expansion joints and beam-rail adjusters. This will inevitably increase the project cost and put forward higher requirements for the production and manufacturing of the aforementioned beam end connecting components and dampers. Summary of the Invention

[0004] The purpose of this invention is to propose a simple, reliable device that can effectively control the longitudinal vibration deformation at the end of a suspension bridge under train load and release the temperature deformation of the bridge structure.

[0005] The technical solution for achieving the objective of this invention is as follows:

[0006] A device for reducing longitudinal vibration deformation at the end of a railway suspension bridge includes a temperature deformation release spring coil and one or more live load displacement control spring coils. If there is only one live load displacement control spring coil, its diameter is smaller than that of the temperature deformation release spring coil. If there are two or more live load displacement control spring coils, their diameters decrease sequentially, with the largest live load displacement control spring coil having a diameter smaller than that of the temperature deformation release spring coil. All live load displacement control spring coils are tangentially connected to the outer surface of the temperature deformation release spring coil. The tangential connection is connected to the abutment, and the temperature deformation release spring coil is connected to the main beam along the longitudinal direction of the bridge on the side corresponding to the tangential connection. Alternatively, the tangential connection is connected to the main beam, and the temperature deformation release spring coil is connected to the abutment along the longitudinal direction of the bridge on the side corresponding to the tangential connection.

[0007] Preferably, among all the live load displacement control spring coils, the one with the largest diameter has a diameter smaller than the longitudinal displacement value of the main beam under live load.

[0008] Preferably, the diameter of the temperature deformation release spring coil is greater than the longitudinal deformation of the main beam under temperature action.

[0009] Preferably, both the live load displacement control spring coil and the temperature deformation release spring coil are made of high-strength steel wire.

[0010] Furthermore, it also includes a damper; one side of the damper is connected to the tangential connection, and the other side is connected to the side of the live load displacement control spring coil with the smallest diameter corresponding to the tangential connection along the longitudinal direction of the bridge.

[0011] Furthermore, among all the live load displacement control spring coils, the one with the smallest diameter is filled with damping material.

[0012] Furthermore, among all the live load displacement control spring coils, damping material is also filled between the two live load displacement control spring coils with successively increasing diameters; damping material is also filled between the live load displacement control spring coil with the largest diameter and the temperature deformation release spring coil. Preferably, the damping material filled in all parts is the same; or, the damping material filled in all parts is different.

[0013] The beneficial effects of this invention are that it reduces the longitudinal vibration deformation of the beam end under train load and can release the temperature deformation of the bridge structure. Attached Figure Description

[0014] Figure 1 This is a side view of an embodiment of the present invention.

[0015] Figure 2 This is a top view of an embodiment of the present invention.

[0016] Figure 3 This is a top view of another embodiment of the present invention.

[0017] Figure 4 This is a top view of an embodiment of the present invention with an added damper.

[0018] Figure 5 This is a top view of the damping material filling in an embodiment of the present invention.

[0019] The diagram is labeled as follows: 1. Abutment; 2. Live load displacement control spring coil; 2'. Another live load displacement control spring coil; 3. Temperature deformation release spring coil; 4. Main beam (stiffening beam); 5. Pier; 6. Damper; 7. Damping material 1; 8. Damping material 2. Detailed Implementation

[0020] like Figure 1 , Figure 2 As shown, a device for reducing longitudinal vibration deformation at the end of a railway suspension bridge is provided. The device mainly includes a nonlinear variable stiffness spring coil: a live load displacement control spring coil 2 and a temperature deformation release spring coil 3. The spring coil can be formed by winding high-strength steel wire.

[0021] Taking a 1000m main span railway suspension bridge as an example, the temperature deformation release spring coil 3 has a diameter of 50cm, and its diameter is designed according to the temperature deformation of different bridge structures. Generally speaking, the diameter of the temperature deformation release spring coil should be greater than the longitudinal deformation of the main beam under temperature action. The live load displacement control spring coil 2 has a diameter of 25cm, and its diameter can be designed in conjunction with the design requirements of the beam end expansion joint, and can be changed according to different longitudinal displacement limits. Generally speaking, the diameter of the live load displacement control spring coil should be smaller than the longitudinal displacement value of the main beam under live load. The live load displacement control spring coil 2 is placed inside the temperature deformation release spring coil 3, and the two are tangentially set on the outside of the spring coil, near the abutment (e.g., Figure 1 , Figure 2 (As shown) or on the main beam side. On the other side, the temperature deformation release spring coil 3 is set at the corresponding position along the longitudinal direction of the bridge.

[0022] The nonlinear variable stiffness spring coils (i.e., live load displacement control spring coils 2 and temperature deformation release spring coils 3) are connected to the abutment or main beam through commonly used prefabricated anchors. The release of temperature deformation and control of live load displacement are achieved through the radial deformation of the spring coils.

[0023] Two or more live load displacement control spring coils 2 can also be used, such as Figure 3As shown, a live load displacement control spring coil 2' is added inside the live load displacement control spring coil 2. The diameter of the added live load displacement control spring coil 2' is smaller than that of the live load displacement control spring coil 2. Similarly, live load displacement control spring coils with progressively smaller diameters can be added inside the live load displacement control spring coil 2'. The multiple live load displacement control spring coils arranged in layers can further constrain the longitudinal deformation of the main beam by relying on the longitudinal variable stiffness characteristics, and resist large impacts and achieve vibration reduction and energy dissipation effects.

[0024] Adding a common damper or filling it with ordinary damping material inside the nonlinear variable stiffness spring coil can further enhance the vibration reduction effect.

[0025] like Figure 4 As shown, the damper 6 is located inside the live load displacement control spring coil 2 and is connected to the spring using a conventional damper connection method. Since the nonlinear variable stiffness spring coil itself has certain damping and vibration reduction characteristics, it can effectively reduce the beam end motion speed. If there are two or more live load displacement control spring coils 2, then the damper 6 should be located inside the live load displacement control spring coil 2 with the smallest diameter.

[0026] Damping material can be filled separately inside the live load displacement control spring coil 2. After filling the live load displacement control spring coil 2 with damping material, the space between the live load displacement control spring coil 2 and the temperature deformation release spring coil 3 may or may not need to be filled with damping material again, such as... Figure 5 As shown. Figure 5 In this system, the damping materials used to fill the two parts are different, or the same damping material can be used and filled separately. Filling the inside of the spring coil with damping material can improve the vibration reduction and energy dissipation effect of the device, effectively reduce the longitudinal movement speed of the main beam end, and ensure the safety of trains traveling on the bridge.

[0027] Under normal operating conditions, the temperature deformation release spring coil 3, due to its relatively small radial stiffness and diameter comparable to the longitudinal temperature deformation of the bridge, can release structural temperature deformation. When a train load is applied and the main girder of the suspension bridge undergoes significant longitudinal motion deformation, the temperature deformation release spring coil 3 at both ends of the girder and the live load displacement control spring coil 2 simultaneously undergo radial tensile or compressive deformation, thereby controlling the longitudinal vibration deformation at the ends of the suspension bridge. If dampers or damping materials are installed inside the spring coils, even better vibration reduction can be achieved.

[0028] This invention has a simple structure, stable performance, and good durability. It can simultaneously realize the combined functions of releasing temperature deformation and controlling the longitudinal displacement of the beam end under train load. It can also reduce the manufacturing difficulty of viscous dampers, facilitate the design and manufacturing of beam end expansion joints, and reduce engineering costs.

Claims

1. A device for reducing longitudinal vibration deformation of railway suspension bridge end, characterized in that, The temperature deformation release spring coil is further provided with more than one live load displacement control spring coil; If the live load displacement control spring coil is one, the diameter of the live load displacement control spring coil is smaller than the diameter of the temperature deformation release spring coil; If the live load displacement control spring coil is more than one, the diameters of all the live load displacement control spring coils are successively reduced, and the diameter of the largest one is smaller than the diameter of the temperature deformation release spring coil; All the live load displacement control spring coils are tangentially connected to the outside of the temperature deformation release spring coil; the tangential connection part is connected to the abutment, and the temperature deformation release spring coil is connected to the main beam on the side corresponding to the tangential connection part along the longitudinal direction of the bridge; or, the tangential connection part is connected to the main beam, and the temperature deformation release spring coil is connected to the abutment on the side corresponding to the tangential connection part along the longitudinal direction of the bridge.

2. A device for reducing longitudinal vibration deformation of railway suspension bridge ends as claimed in claim 1, characterized in that, The diameter of the largest one of all the live load displacement control spring coils is smaller than the longitudinal displacement value of the main beam under the action of the live load.

3. A device for reducing longitudinal vibration deformation of railway suspension bridge ends as claimed in claim 1, characterized in that, The diameter of the temperature deformation release spring coil is larger than the longitudinal deformation value of the main beam under the action of the temperature.

4. A device for reducing longitudinal vibration deformation of railway suspension bridge ends as claimed in claim 1, characterized in that, Both the live load displacement control spring coil and the temperature deformation release spring coil are composed of high-strength steel wire.

5. A device for reducing longitudinal vibration deformation of railway suspension bridge ends as claimed in claim 1, characterized in that, A damper is further provided; one side of the damper is connected to the tangential connection part, and the other side is connected to the side of the smallest one of the live load displacement control spring coils corresponding to the tangential connection part along the longitudinal direction of the bridge.

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