Direction-variable lifting-free friction pendulum support and application thereof

Abstract

The invention discloses a direction-variable lifting-free friction pendulum support and application thereof, and relates to the technical field of bridge damping and vibration isolation, the direction-variable lifting-free friction pendulum support comprises an upper support plate, a lower support plate and a ball screw device arranged between the upper support plate and the lower support plate; an upper limiting ring, a sliding block and a rubber ring are arranged on the lower surface of the upper support plate; a rubber pad and a lower limiting ring are arranged on the upper surface of the lower support plate; the ball screw device is composed of a screw nut, a ball and a screw, and a guide groove is formed in the upper surface of the screw nut. According to the novel support, direction conversion of displacement response and non-lifting in the vertical direction are achieved through the innovative design of a mechanical structure, it can still be guaranteed that the transverse acceleration peak value of a pier in an earthquake is lowered while the diameter of a pile foundation is reduced, and the upper support plate is always kept at the horizontal reference position in a strong earthquake; and the vertical lifting amount is eliminated while self-resetting is carried out, so that the vertical irregularity amplitude of the rail during and after an earthquake is remarkably reduced, the linear recovery efficiency of the rail after the earthquake is improved, and the line outage time is greatly shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge shock absorption and vibration isolation, and particularly relates to a variable-direction non-lifting friction pendulum bearing and its application. Background Art

[0002] As of the end of 2024, the high-speed railway mileage in China reached 48,000 kilometers, ranking first in the world. China's extremely long high-speed railway network, extremely high proportion of bridges in the line, combined with frequent earthquakes, make the trains running on high-speed railway bridges in China face huge potential earthquake threats. The friction pendulum bearing is one of the important means for bridge shock absorption and isolation and is widely used in highway bridges. However, in the high-speed rail system, the horizontal displacement and vertical uplift generated by the friction pendulum bearing under earthquakes will significantly worsen the track irregularity of the bridge-rail structure, seriously threatening the safety of trains running on the bridge during earthquakes and disaster relief and reconstruction after earthquakes. Therefore, it is necessary to develop a new type of shock absorption and isolation bearing suitable for the high-speed rail system.

[0003] Therefore, there is a need to provide a variable-direction non-lifting friction pendulum bearing structure, system and its application that can convert the weak-stiffness lateral displacement of the high-speed railway bridge system into a strong-stiffness longitudinal displacement under earthquake action, thereby restricting the lateral displacement of the high-speed railway and eliminating the influence of irregularity at the same time. Summary of the Invention

[0004] The purpose of the present invention is to provide a variable-direction non-lifting friction pendulum bearing and its application to solve the above problems. Through a specially designed chute, the weak-stiffness lateral displacement of the high-speed railway bridge system during earthquakes is converted into a strong-stiffness longitudinal displacement; the vertical non-lifting is achieved through a ball screw structure, thereby reducing the lateral displacement of the high-speed railway bridge and eliminating the influence of vertical irregularity at the same time.

[0005] The present invention discloses a variable-direction non-lifting friction pendulum bearing, which includes an upper bearing plate, a lower bearing plate, and a ball screw device arranged between the upper bearing plate and the lower bearing plate. A slider is arranged on the lower surface of the upper bearing plate, forming a variable-direction non-lifting system with the ball screw device.

[0006] Preferably, the upper bearing plate further includes an upper limit ring and a rubber ring arranged below the upper bearing plate. The slider is arranged at the center of the upper bearing plate. The rubber ring includes a lower pendulum fitting with the upper limit ring and a circular rubber pad fitting with the lower surface of the upper bearing. The diameter of the hollow center of the circular rubber pad is equal to the cross-sectional diameter of the slider.

[0007] Preferably, a lower limit ring and a rubber pad are arranged on the upper surface of the lower bearing plate.

[0008] Preferably, the ball screw device is composed of a screw nut, balls and a screw. The screw is arranged inside the screw nut, a thread structure is provided between the screw nut and the screw, and the balls are filled inside the thread structure. A guiding groove is provided on the upper surface of the screw nut, and a wear-resistant alloy coating is provided on the surface of the guiding groove. The screw is connected to the lower support plate by bolts.

[0009] Preferably, the diameters of the upper limit ring and the lower pendulum of the rubber ring are both larger than the diameter of the screw nut.

[0010] Preferably, the upper support plate, the screw, the screw nut and the lower support plate are coaxially arranged.

[0011] The present invention also provides an application of the above variable-direction non-lifting friction pendulum bearing. The variable-direction non-lifting friction pendulum bearing is applied to the field of bridges and is installed between the main beam and the pier of the bridge.

[0012] Preferably, taking the longitudinal direction of the bridge as the x direction, the transverse direction of the bridge as the y direction, and the gravity direction as the z direction, the variable-direction non-lifting system satisfies the following relationship:

[0013]

[0014] Wherein, d is the distance from the lowest point of the guiding groove; z s (d) is the vertical coordinate value of the guiding groove at the slider movement distance d, θ(d) is the steering angle of the screw nut at the slider movement distance d, and P is the thread pitch of the ball screw; z s (d) is equal to the up and down movement distance of the screw nut.

[0015] Preferably, the guiding groove is an S-shaped chute in the xoy horizontal plane. Under the action of the transverse seismic wave, the slider makes an approximate linear movement in the x direction in the xoy horizontal plane. The upper support plate moves in the guiding groove through the slider, the guiding groove drives the screw nut to rotate, and the screw nut drives the guiding groove to move up and down.

[0016] Preferably, the variable-direction non-lifting friction pendulum bearing is a one-way bearing, and when it is installed, the long axis of the guiding groove is arranged along the direction with less deformation.

[0017] Therefore, the present invention adopts the above variable-direction non-lifting friction pendulum bearing and its application, and has the following beneficial effects:

[0018] 1) Displacement direction conversion function: The bearing of the present invention realizes the direction conversion of displacement response through innovative design of mechanical structure. For example, under the action of lateral earthquake, the original lateral displacement (weak stiffness direction) of the high-speed railway bridge system is converted into longitudinal displacement (strong stiffness direction), thereby reducing the lateral deformation of the high-speed railway bridge. This device can reduce the diameter of the pile foundation while still ensuring that the peak value of the lateral acceleration of the pier during the earthquake decreases, which not only reduces the construction cost but also improves the seismic performance.

[0019] 2) No vertical uplift: The traditional friction pendulum bearing has a vertical uplift amount. Through the coordinated action of the ball screw and the sliding groove, the upper bearing plate of the present invention always maintains a horizontal reference position during a strong earthquake, eliminating the vertical uplift amount while self-resetting. This significantly reduces the amplitude of vertical irregularity of the track during and after the earthquake, improves the recovery efficiency of the track alignment after the earthquake, and greatly reduces the line outage time. Brief Description of the Drawings

[0020] Figure 1 It is a cross-sectional view of the variable-direction and non-uplift type friction pendulum bearing provided by the present invention;

[0021] Figure 2 It is a three-dimensional explosion diagram of the variable-direction and non-uplift type friction pendulum bearing provided by the present invention;

[0022] Figure 3 It is a schematic comparison diagram of the horizontal displacement direction conversion principle between the variable-direction and non-uplift type friction pendulum bearing provided by the present invention and a common bearing;

[0023] Figure 4 It is a schematic diagram of the vertical displacement control principle of the variable-direction and non-uplift type friction pendulum bearing provided by the present invention;

[0024] Figure 5 It is an installation diagram of the variable-direction and non-uplift type friction pendulum bearing provided by the present invention.

[0025] Reference Signs:

[0026] 1 - upper bearing plate; 2 - upper limit ring; 3 - slider; 4 - rubber ring; 5 - guide groove; 6 - lead screw nut; 7 - ball; 8 - bolt; 9 - lead screw; 10 - rubber pad; 11 - lower limit ring; 12 - lower bearing plate. Detailed Description of the Invention

[0027] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the protection scope of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "periphery", "lateral", "longitudinal", "length", "thickness", "angle", "upper", "lower", "left", "right", etc. indicating directions or positions are only for simplifying the description of the present invention, rather than specific positions or orientations, and the above terms do not limit the present invention.

[0029] The present invention provides a variable-direction non-lifting friction pendulum bearing, and its structure is as Figure 1 - Figure 2 shown, including an upper bearing plate 1, a lower bearing plate 12, and a ball 7 screw 9 device disposed therebetween. A slider 3 is provided on the lower surface of the upper bearing plate 1, forming a variable-direction non-lifting system with the ball 7 screw 9 device.

[0030] The ball 7 screw 9 device is composed of a screw nut 6, balls 7, and a screw 9. The screw 9 is disposed inside the screw nut 6. There is a 25 mm thread structure between the screw 9 and the screw nut 6. There are 23 mm balls 7 inside and filled with silicone oil or other lubricating fluids, which can significantly reduce the friction of the structural rotation.

[0031] A guide groove 5 is provided on the upper surface of the screw nut 6, and the surface of the guide groove 5 is provided with a wear-resistant alloy coating, which cooperates with the low-friction characteristics of the ball 7 screw 9, thereby improving the service life of key components and showing outstanding economy in long-term operation. The screw 9 is connected to the lower bearing plate 12 through a bolt 8.

[0032] An upper limit ring 2 and a rubber ring 4 are also provided on the lower surface of the upper bearing plate 1; the slider 3 is disposed at the center of the upper bearing plate 1. The rubber ring 4 includes a lower pendulum that fits with the upper limit ring 2 and a circular rubber pad that fits with the lower surface of the upper bearing. The diameter of the hollow center of the circular rubber pad is equal to the cross-sectional diameter of the slider 3.

[0033] A rubber pad 10 and a lower limit ring 11 are provided on the upper surface of the lower bearing plate 12.

[0034] The rubber pads 10 of the upper bearing plate 1 and the lower bearing plate 12 can buffer the hard collisions between the screw nut 6 moving up and down and the upper bearing plate 1 and the lower bearing plate 12; the lower pendulum of the rubber ring 4 can buffer the side collisions between the upper bearing plate 1 and the screw nut 6. The diameters of the upper limit ring 2 and the lower pendulum of the rubber ring 4 are both larger than the diameter of the screw nut 6, leaving a space interval, which is set according to actual needs. The upper bearing plate 1, the screw 9, the screw nut 6, and the lower bearing plate 12 are coaxially arranged; the slider 3, the guide groove 5, the screw nut 6, and the screw 9 make reciprocating rotational and lifting motions with the change of pressure.

[0035] The principle of the horizontal displacement variable direction of the bearing provided in this embodiment is as Figure 3As shown in the figure, let the longitudinal direction of the bridge be the x - direction, the transverse direction of the bridge be the y - direction, and the direction perpendicular to the paper plane and outward be the z - direction. Under the action of the same transverse seismic wave, the ordinary bearing will have a transverse horizontal displacement of distance d; while for the variable - direction non - lifting bearing, through the linkage of the slider 3 and the guide groove 5, it drives the guide groove 5 and the lead - screw nut 6 to rotate simultaneously. The transverse horizontal displacement ΔY of the bearing is reduced from the original d to dsinθ, and the longitudinal displacement ΔX becomes dcosθ, where θ is the steering angle of the lead - screw nut 6 when the slider moves a distance d. The guiding curve of the guide groove 5 in the xoy horizontal plane is carefully designed, with a gradually changing curvature transition, which corrects the movement trajectory of the slider 3 from a curve to an approximate straight line, converting the original transverse movement perpendicular to the track into a longitudinal movement parallel to the track direction. This direction - conversion mechanism converts the weak - stiffness transverse displacement of the high - speed rail bridge system into a strong - stiffness longitudinal displacement, thereby restricting and reducing the transverse displacement of the high - speed railway.

[0036] The principle of controlling the vertical displacement of the bearing provided in this embodiment is as Figure 4 shown. The lead - screw nut 6 is initially placed at the top of the thread structure of the lead - screw 9. The lead - screw nut 6 can only move downward relative to the lead - screw 9. The rotational descent distance h is consistent with the vertical coordinate value z of the guide groove 5 when the slider 3 moves a distance d (also the distance from the lowest point of the guide groove), s thus ensuring that the upper bearing plate 1 does not lift. The vertical movement of the ball - screw device effectively eliminates the displacement - lifting problem of the traditional friction - pendulum bearing, enabling the bearing to always maintain a horizontal reference position during strong earthquakes.

[0037] The installation of the bearing provided in this embodiment is as Figure 5 shown. The variable - direction non - lifting friction - pendulum bearing structure is applied to the high - speed railway track - bridge system. The new bearing is a one - way bearing, installed between the main beam and the bridge pier. The long axis of the guide groove is placed along the longitudinal direction of the bridge x, as shown in the A - A section in the figure.

[0038] A variable - direction non - lifting friction - pendulum bearing provided by the present invention realizes the direction conversion of displacement response through innovative design of the mechanical structure. For example, under the action of a transverse earthquake, it converts the original transverse displacement (the weak - stiffness direction) of the high - speed rail bridge system into a longitudinal displacement (the strong - stiffness direction), thereby reducing the transverse deformation of the high - speed railway bridge. This device can reduce the diameter of the pile foundation while still ensuring that the peak value of the transverse acceleration of the bridge pier during an earthquake decreases, which not only reduces the construction cost but also improves the seismic performance.

[0039] The traditional friction - pendulum bearing has a vertical lifting amount. The present invention, through the synergistic action of the ball - screw and the sliding groove, enables the upper bearing plate to always maintain a horizontal reference position during strong earthquakes, eliminating the vertical lifting amount while self - resetting, thereby significantly reducing the amplitude of the vertical irregularity of the track during and after an earthquake, improving the recovery efficiency of the track alignment after an earthquake, and greatly reducing the line outage time.

[0040] The specific embodiments described above further illustrate the object, technical solution and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and do not limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A variable-direction non-lifting friction pendulum support, characterized in that: It comprises an upper support plate, a lower support plate and a ball screw device arranged between the upper support plate and the lower support plate. A slider is arranged on the lower surface of the upper support plate. The slider and the ball screw device form a direction-changing non-lifting system.

2. The variable-direction non-lifting friction pendulum support according to claim 1, characterized in that: The upper support plate also includes an upper limit ring and a rubber ring arranged below the upper support plate. The slider is arranged at the center of the upper support plate. The rubber ring includes a hem that fits with the upper limit ring and a circular rubber pad that fits with the lower surface of the upper support. The hollow center diameter of the circular rubber pad is equal to the cross-sectional diameter of the slider.

3. The variable-direction non-lifting friction pendulum support according to claim 1, characterized in that: A lower limiting ring and a rubber pad are arranged on the upper surface of the lower support plate.

4. The variable-direction non-lifting friction pendulum support according to claim 2, characterized in that: The ball screw device consists of a screw nut, a ball and a screw, the screw is arranged inside the screw nut, a threaded structure is arranged between the screw nut and the screw, and the ball is filled inside the threaded structure; the screw nut is provided with a guide groove on the upper surface of the screw nut, the surface of the guide groove is provided with a wear-resistant alloy coating, and the screw is connected to the lower support plate by bolts.

5. The variable direction non-lifting friction pendulum support according to claim 4, characterized in that: The diameters of the upper limit ring and the lower hem of the rubber ring are both larger than the diameter of the lead screw nut.

6. The variable-direction non-lifting friction pendulum support according to claim 4, characterized in that: The upper support plate, the lead screw, the lead screw nut and the lower support plate are coaxially arranged.

7. An application of a variable direction non-lifting friction pendulum bearing as claimed in any one of claims 1 to 6, characterized in that: The variable non-lifting friction pendulum bearing is applied in the field of bridges and installed between the main beam and the pier of the bridge.

8. The use of a variable direction non-lifting friction pendulum support according to claim 7, characterized in that: With the longitudinal direction of the bridge as the x direction, the transverse direction of the bridge as the y direction, and the direction of gravity as the z direction, the direction-changing non-lifting system satisfies the following relationship: Where d is the distance the slider moves; z s (d) is the vertical coordinate value of the guide groove when the slider moves a distance d, θ(d) is the steering angle of the screw nut when the slider moves a distance d, and P is the pitch of the ball screw thread; s (d) is equal to the up and down movement distance of the screw nut.

9. The use of a variable direction non-lifting friction pendulum support according to claim 8, characterized in that: The guide groove is an S-shaped groove in the xoy horizontal plane. Under the action of transverse seismic waves, the slider makes an approximate linear motion in the x direction in the xoy horizontal plane. The upper support plate moves in the guide groove through the slider. The guide groove drives the screw nut to rotate, and the screw nut drives the guide groove to move up and down.

10. The use of a variable direction non-lifting friction pendulum support according to claim 8, characterized in that: The variable non-lifting friction pendulum support is a one-way support, and when it is installed, the major axis of the guide groove is arranged along the direction with smaller deformation.

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