Piezoelectric energy consumption-based vertical vibration reduction support for bridge engineering

Abstract

The invention discloses a vertical vibration reduction support based on piezoelectric energy consumption for bridge engineering, which comprises a base plate, a lower seat plate arranged in the base plate, a middle seat plate arranged on the lower seat plate, an upper seat plate arranged on the middle seat plate, a vibration reduction disc arranged in the base plate and used for vertical vibration reduction, the upper end of the vibration reduction disc is in contact with the lower seat plate, and the lower end of the vibration reduction disc is in contact with the upper seat plate. A piezoelectric energy dissipation assembly is arranged between the vibration reduction disc and the base plate, the vibration reduction disc is in an arch shape, the arc face of the vibration reduction disc is connected with a pressure bearing block, and the plane of the lower end of the pressure bearing block is connected with the piezoelectric energy dissipation assembly. The vibration reduction disc is made of a spring steel material and adopts an arch-shaped structure, so that stable vertical support can be provided for an upper structure under the action of static force. Vibration reduction and energy consumption of the vertical support are achieved through the piezoelectric energy consumption assembly, the piezoelectric energy consumption assembly converts high-frequency vibration mechanical energy of the support into electric energy through the two piezoelectric ceramic plates, the energy consumption efficiency is high, the working temperature range is wide, and the adaptive capacity is high.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge engineering, and in particular relates to a vertical vibration reduction bearing based on piezoelectric energy consumption for bridge engineering. Background Art

[0002] At present, with the large-scale construction of high-speed railways in my country, the impact of high operating speeds and densities on environmental vibration has gradually become a key issue of concern to the whole society. The most notable feature of the impact of high-speed railway bridge structures on environmental vibration is that it lasts for a long time and has a growing trend. Generally speaking, the interval between trains running on double-track railways is generally 2-3 minutes, and the shortest interval between rail transit in the world has dropped to 1.5 minutes. This long-term, invisible vibration has a significant negative impact on people's health, building structures, precision instruments, etc. In recent years, in the planning and construction of domestic rail transit systems, environmental assessments including vibration impacts have become an indispensable procedure in the planning and design of new rail transit systems.

[0003] The main function of traditional seismic isolation bearings is to reduce the vibration response of the lower structure under horizontal loads. However, there are relatively few studies on vertical vibration isolation bearing technology to reduce the vibration response of the lower structure (bridge piers, foundations) and the surrounding environment under the dynamic action of high-speed trains, and the main problems are as follows:

[0004] 1. Although the vibration-damping bearings made of steel can reduce the vibration response of the lower structure to a certain extent, the vibration of the bridge structure caused by the train will be difficult to dissipate due to the lack of damping and energy-absorbing components in the bearings. In addition, as the density of train operations increases, the response of the structural vibration will gradually accumulate. During the period of intensive train operation, the impact of train vibration on the environment will exist for a long time.

[0005] 2. Although some bearing products are made of all-metal materials, the long-term and continuous vibration mentioned above will cause fatigue problems in the metal vibration-absorbing components, thereby causing premature failure of the bearing.

[0006] 3. At present, some bearings use high damping rubber materials or liquid viscous damping devices to provide damping force. However, these two forms of damping vibration reduction have the following problems:

[0007] (1) Rubber materials are prone to aging. The life cycle of bridges / bearings is usually long, and it is difficult to ensure the stability of rubber materials during use in harsh environments;

[0008] (2) The effective vibration reduction frequency range of the vibration reduction bearing is: Where ω is the vibration frequency of the external load, ω n is the natural frequency of the support body. According to the basic principles of structural dynamics, when When the viscous energy dissipation is increased on the basis of the vibration reduction bearing, the force transmission rate will increase instead. Summary of the invention

[0009] The present invention is proposed to solve the problems existing in the prior art, and its purpose is to provide a vertical vibration-damping bearing based on piezoelectric energy consumption for bridge engineering.

[0010] The technical solution of the present invention is: a vertical vibration-damping bearing based on piezoelectric energy dissipation for bridge engineering, comprising a base plate, a lower seat plate located therein, a middle seat plate arranged on the lower seat plate, an upper seat plate arranged on the middle seat plate, a vibration-damping disk for vertical vibration reduction arranged in the base plate, the upper end of the vibration-damping disk is in contact with the lower seat plate, and a piezoelectric energy dissipation component is arranged between the vibration-damping disk and the base plate.

[0011] Furthermore, the vibration damping disk is arched, the arc surface of the vibration damping disk is connected to the pressure block, and the lower end plane of the pressure block is connected to the piezoelectric energy dissipation component.

[0012] Furthermore, the piezoelectric energy dissipation component includes an upper high-resistance conductive tube and a lower high-resistance conductive tube, and the upper high-resistance conductive tube and the lower high-resistance conductive tube are cylindrical with axial holes, and a hollow cavity is formed inside the upper high-resistance conductive tube and the lower high-resistance conductive tube.

[0013] Furthermore, piezoelectric ceramic plates are arranged on the upper and lower surfaces of the piezoelectric energy dissipation component, and electrode plates are arranged on the surfaces of the piezoelectric ceramic plates, and conductive plates are arranged between the piezoelectric ceramic plates, so as to ensure effective transfer of charge.

[0014] Furthermore, the electrode plates are connected to the upper high-resistance conductive cylinder and the lower high-resistance conductive cylinder respectively.

[0015] Furthermore, the upper high-resistance conductive cylinder and the lower high-resistance conductive cylinder are aligned at their side walls to form long holes, and bolts connecting the two are arranged in the long holes.

[0016] Furthermore, a supporting slide plate is arranged between the vibration-damping plate and the base plate, and the supporting slide plate ensures that the vibration-damping plate can slide horizontally on the base plate.

[0017] Furthermore, a lower guide bar is arranged between the vibration damping disc and the side wall of the base plate, and a certain gap is reserved between the lower guide bar and the side wall of the base plate to release the radial deformation of the vibration damping disc.

[0018] Furthermore, a guide friction pair is provided between the side wall of the base plate and the outer side wall of the lower seat plate.

[0019] The beneficial effects of the present invention are as follows:

[0020] The vertical vibration reduction support of the present invention is designed with all-metal materials, and can realize the functions of vertical vibration reduction and horizontal vibration reduction at the same time, overcoming the problems of aging and fatigue of the existing vertical vibration reduction support. The piezoelectric energy dissipation form is adopted to avoid the phenomenon of force transmission rate amplification caused by the use of viscous damping energy dissipation.

[0021] The vibration damping disc of the present invention is made of spring steel material and adopts an arched structure, which can provide stable vertical support for the superstructure under static force. Under the action of the additional vertical dynamic load of the train, the vibration damping disc with smaller vertical stiffness undergoes downward vertical deformation, and the support vibration reduction requirements under different frequency inputs can be achieved by changing the thickness and diameter of the vibration damping disc.

[0022] A supporting slide plate is arranged between the vibration damping disk and the base plate of the present invention, a guide strip is arranged between the vibration damping disk and the side wall of the base plate, and a certain gap is reserved between the guide strip and the side wall of the base plate to release the radial deformation of the vibration damping disk and effectively improve the vertical vibration damping performance of the support.

[0023] The present invention adopts a piezoelectric energy dissipation component to achieve vibration reduction and energy dissipation of the vertical support. The piezoelectric energy dissipation component uses two piezoelectric ceramic plates to convert the high-frequency vibration mechanical energy of the support into electrical energy. It has high energy dissipation efficiency, a wide operating temperature range, and strong adaptability. It can effectively reduce the vibration amplitude and duration of the support under the vertical dynamic load of the train. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the vertical vibration reduction support structure in the present invention;

[0025] Figure 2 It is a schematic diagram of the structure of the piezoelectric energy-consuming component in the present invention;

[0026] Figure 3 It is a schematic diagram of the structure of the high resistance conductive tube of the present invention;

[0027] Figure 4 It is a schematic diagram of the polarization direction of the piezoelectric ceramic plate in the piezoelectric energy dissipation component of the present invention;

[0028] Among them: 1. Upper seat plate, 2. Base plate, 3. Middle seat plate, 4. Plane friction pair, 5. Spherical friction pair, 6. Lower seat plate, 7. Curved friction pair, 8. Vibration damping plate, 9. Pressure block, 10. Piezoelectric energy dissipation component, 11. Support slide plate, 12. Lower guide bar, 13. Guide friction pair, 10-1. Piezoelectric ceramic plate, 10-2. Conductive plate, 10-3. Electrode plate, 10-4. Upper high-resistance conductive cylinder, 10-5. Lower high-resistance conductive cylinder, 10-6. Bolt. DETAILED DESCRIPTION

[0029] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and embodiments:

[0030] like Figures 1 to 4 As shown, a vertical vibration-damping bearing based on piezoelectric energy dissipation for bridge engineering includes a base plate 2, a lower base plate 6 is arranged in the base plate 2, a middle base plate 3 is arranged on the lower base plate 6, an upper base plate 1 is arranged on the middle base plate 3, a vibration-damping disk 8 for vertical vibration reduction is arranged in the base plate 2, the upper end of the vibration-damping disk 8 is in contact with the lower base plate 6, and a piezoelectric energy dissipation component 10 is arranged between the vibration-damping disk 8 and the base plate 2.

[0031] The vibration damping disk 8 is arched, and the arc surface of the vibration damping disk 8 is connected to the pressure block 9 , and the lower end plane of the pressure block 9 is connected to the piezoelectric energy dissipation component 10 .

[0032] The piezoelectric energy dissipation component 10 includes an upper high-resistance conductive tube 10-4 and a lower high-resistance conductive tube 10-5. The upper high-resistance conductive tube 10-4 and the lower high-resistance conductive tube 10-5 are cylindrical in shape with axial holes joined together, and hollow cavities are formed inside the upper high-resistance conductive tube 10-4 and the lower high-resistance conductive tube 10-5.

[0033] The upper and lower surfaces of the piezoelectric energy dissipation component 10 are both provided with piezoelectric ceramic plates 10-1, and the surfaces of the piezoelectric ceramic plates 10-1 are provided with electrode plates 10-3, and conductive plates 10-2 are provided between the piezoelectric ceramic plates 10-1, so as to ensure effective transfer of charge.

[0034] The electrode plate 10 - 3 is connected to the upper high-resistance conductive cylinder 10 - 4 and the lower high-resistance conductive cylinder 10 - 5 respectively.

[0035] The upper high-resistance conductive cylinder 10-4 and the lower high-resistance conductive cylinder 10-5 are aligned at their side walls to form a long hole, and a bolt 10-6 connecting the two is provided in the long hole.

[0036] A supporting slide plate 11 is arranged between the vibration damping plate 8 and the base plate 2 , and the supporting slide plate 11 ensures that the vibration damping plate 8 can slide horizontally on the base plate 2 .

[0037] A lower guide bar 12 is provided between the damping disc 8 and the side wall of the base plate 2 , and a certain gap is reserved between the lower guide bar 12 and the side wall of the base plate 2 to release the radial deformation of the damping disc 8 .

[0038] A guide friction pair 13 is provided between the side wall of the base plate 2 and the outer side wall of the lower seat plate 6 .

[0039] Specifically, a plane friction pair 4 is provided between the upper seat plate 1 and the middle seat plate 3, and a spherical friction pair 5 is provided between the middle seat plate 3 and the lower seat plate 6. The plane friction pair 4 and the spherical friction pair 5 jointly bear the vertical bearing, horizontal sliding and vertical rotation functions of the support. The horizontal force of the support is realized by the guide friction pair 13 provided between the lower seat plate 6 and the base plate 2.

[0040] Specifically, the vibration damping plate 8 is made of spring steel and has an arched structure, which can provide stable vertical support for the upper structure under static force. Under the vertical dynamic load of the train, the vibration damping plate 8 undergoes downward vertical deformation.

[0041] Specifically, a support slide plate 11 is provided between the vibration damping plate 8 and the base plate 2 to ensure that the vibration damping plate 8 can slide horizontally on the base plate 2. A lower guide bar 12 is provided between the vibration damping plate 8 and the side wall of the base plate 2, and a certain gap is reserved between the lower guide bar 12 and the side wall of the base plate 2 to release the radial deformation of the vibration damping plate 8.

[0042] Specifically, a pressure block 9 is provided between the vibration damping disc 8 and the piezoelectric energy dissipation component 10. The pressure block 9 is made of spring steel. Under the vertical dynamic load of the train, the vibration damping disc 8 undergoes a downward vertical deformation, transferring the vertical dynamic load to the pressure block 9, and then transferring the load to the piezoelectric energy dissipation component 10.

[0043] Specifically, a curved friction pair 7 is provided between the pressure block 9 and the bottom surface of the damping plate 8 to ensure that the radial deformation of the damping plate 8 and the pressure block 9 do not interfere with each other, and the curved friction pair 7 can be used to achieve a certain friction energy consumption.

[0044] Specifically, when there is no train running, a small gap is ensured between the pressure block 9 and the vibration damping plate 8 to ensure that the vibration damping plate 8 can provide an effective vertical starting stiffness.

[0045] Specifically, the piezoelectric energy dissipation component 10 is composed of an electrode plate 10-3, a piezoelectric ceramic plate 10-1, a conductive plate 10-2, an upper high-resistance conductive cylinder 10-4, a lower high-resistance conductive cylinder 10-5, and a bolt 10-6. Under the action of vertical dynamic pressure, the outer surfaces of the two piezoelectric ceramic plates 10-1 on the upper surface and the lower surface generate positive and negative charges respectively, and the upper high-resistance conductive cylinder 10-4 and the lower high-resistance conductive cylinder 10-5 connect the piezoelectric ceramic plates 10-1 on the upper surface and the lower surface. The voltage difference between the electrode plates 10-3 generates current in the electrical circuit of the piezoelectric energy dissipation component 10, and the upper high-resistance conductive cylinder 10-4 and the lower high-resistance conductive cylinder 10-5 convert electrical energy into heat energy.

[0046] Specifically, oblong holes are provided on the upper high resistance conductive cylinder 10-4 and the lower high resistance conductive cylinder 10-5, and the diameter of the lower high resistance conductive cylinder 10-5 is smaller than the diameter of the upper high resistance conductive cylinder 10-4. The upper high resistance conductive cylinder 10-4 and the lower high resistance conductive cylinder 10-5 are connected by bolts 10-6. It is ensured that the upper high resistance conductive cylinder 10-4 and the lower high resistance conductive cylinder 10-5 can be vertically deformed relative to each other, and that the two are effectively connected to form a complete current loop.

[0047] Specifically, the polarization directions of the two piezoelectric ceramic plates 10-1 on the upper and lower surfaces are opposite, ensuring that under pressure, a positive charge is generated on the outer surface of one piezoelectric ceramic plate 10-1 and a negative charge is generated on the outer surface of the other piezoelectric ceramic plate 10-1, thereby forming a voltage difference between the upper and lower electrode plates 10-3.

[0048] The vertical vibration-damping support of the present invention realizes the vertical vibration-damping performance of the support by the vibration-damping disc 8, and realizes the vertical vibration-damping effect of the support by the piezoelectric energy-absorbing component 10. The vibration-damping disc 8 is made of spring steel material, and the arched structure adopted can ensure that the support provides stable vertical support for the upper structure under the action of static force. Under the action of the additional vertical dynamic load of the train, the vibration-damping disc 8 with a smaller vertical stiffness undergoes downward vertical deformation. The designer can achieve the vibration-damping requirements of the support under different frequency inputs by changing the thickness and diameter of the vibration-damping disc 8.

[0049] In the present invention, under the vertical vibration load of the train, the vibration damping disc 8 is vertically deformed, and the piezoelectric energy dissipation component 10 below it is squeezed by the pressure block 9. Under the vertical dynamic pressure, the outer surfaces of the upper and lower piezoelectric ceramic plates 10-1 of the piezoelectric energy dissipation component 10 respectively generate positive and negative charges, and the voltage difference between the bottom and upper electrode plates 10-3 generates current in the electric circuit of the piezoelectric energy dissipation component 10, and the upper high-resistance conductive cylinder 10-4 and the lower high-resistance conductive cylinder 10-5 convert the electrical energy into thermal energy. Thus, the vibration mechanical energy of the support is converted into electrical energy, with high energy consumption efficiency, wide operating temperature range, and strong adaptability, avoiding the phenomenon of force transmission rate amplification caused by the use of viscous damping energy dissipation, and can effectively reduce the vibration time and response peak of the support under the vertical dynamic load of the train.

Claims

1. A vertical vibration-damping support based on piezoelectric energy dissipation for bridge engineering, comprising a base plate (2), a lower base plate (6) disposed in the base plate (2), a middle base plate (3) disposed on the lower base plate (6), and an upper base plate (1) disposed on the middle base plate (3), characterized in that: A vibration damping disc (8) for vertical vibration damping is arranged in the base plate (2); the upper end of the vibration damping disc (8) is in contact with the lower base plate (6); and a piezoelectric energy dissipation component (10) for support energy dissipation is arranged between the vibration damping disc (8) and the base plate (2).

2. According to claim 1, a vertical vibration reduction bearing based on piezoelectric energy dissipation for bridge engineering, characterized in that: The vibration damping disk (8) is arched, the arc surface of the vibration damping disk (8) is connected to the pressure bearing block (9), and the lower end plane of the pressure bearing block (9) is connected to the piezoelectric energy dissipation component (10).

3. The vertical vibration reduction bearing based on piezoelectric energy dissipation for bridge engineering according to claim 2 is characterized by: The piezoelectric energy dissipation component (10) comprises an upper high-resistance conductive tube (10-4) and a lower high-resistance conductive tube (10-5); the upper high-resistance conductive tube (10-4) and the lower high-resistance conductive tube (10-5) are in the shape of tubes with axial holes joined together; a hollow cavity is formed inside the upper high-resistance conductive tube (10-4) and the lower high-resistance conductive tube (10-5).

4. The vertical vibration reduction bearing based on piezoelectric energy dissipation for bridge engineering according to claim 3 is characterized by: The upper surface and the lower surface of the piezoelectric energy dissipation component (10) are both provided with piezoelectric ceramic plates (10-1), and the surfaces of the piezoelectric ceramic plates (10-1) are provided with electrode plates (10-3), and conductive plates (10-2) are provided between the piezoelectric ceramic plates (10-1), thereby ensuring effective transfer of electric charges.

5. A vertical vibration reduction bearing based on piezoelectric energy dissipation for bridge engineering according to claim 4, characterized in that: The electrode plate (10-3) is respectively connected to an upper high-resistance conductive cylinder (10-4) and a lower high-resistance conductive cylinder (10-5).

6. The vertical vibration reduction bearing based on piezoelectric energy dissipation for bridge engineering according to claim 3 is characterized by: The upper high-resistance conductive cylinder (10-4) and the lower high-resistance conductive cylinder (10-5) are aligned at their side walls to form a long hole, and a bolt (10-6) connecting the two is provided in the long hole.

7. The vertical vibration reduction bearing based on piezoelectric energy dissipation for bridge engineering according to claim 2 is characterized by: A supporting slide plate (11) is arranged between the vibration damping plate (8) and the base plate (2), and the supporting slide plate (11) ensures that the vibration damping plate (8) can slide horizontally on the base plate (2).

8. The vertical vibration reduction bearing based on piezoelectric energy dissipation for bridge engineering according to claim 2 is characterized by: A lower guide strip (12) is provided between the vibration damping disc (8) and the side wall of the base plate (2), and a certain gap is retained between the lower guide strip (12) and the side wall of the base plate (2) to release radial deformation of the vibration damping disc (8).

9. The vertical vibration reduction bearing based on piezoelectric energy dissipation for bridge engineering according to claim 2 is characterized by: A guide friction pair (13) is provided between the side wall of the base plate (2) and the outer side wall of the lower base plate (6).

Images