Vertical variable stiffness three-dimensional seismic isolation bearing

Abstract

The present invention relates to the field of three-dimensional seismic isolation technology, specifically a vertical variable stiffness three-dimensional seismic isolation bearing, comprising a laminated rubber seismic isolation bearing, wherein the bottom surface of the laminated rubber seismic isolation bearing is connected to an upper connecting plate, a lower connecting plate is provided below the upper connecting plate, and vertical telescopic guide rods are evenly connected between the upper connecting plate and the lower connecting plate; a plurality of tracks are radially provided on the top surface of the lower connecting plate, each track is provided with a slider, and a spring mechanism is hinged on the slider, the spring mechanism is vertically provided and the top is hinged to the bottom surface of the upper connecting plate; a connecting rod is provided between the slider and the center position of the bottom surface of the upper connecting plate, and the two ends of the connecting rod are respectively hinged to the slider and the upper connecting plate. The laminated rubber seismic isolation bearing, track, spring mechanism and connecting rod can meet the engineering requirements of isolating horizontal and vertical seismic motions, have high vertical static stiffness and bearing capacity under static load, have variable stiffness under dynamic load, are lower than the static stiffness, and have good vertical low-frequency seismic isolation effect.

Description

Technical Field

[0001] The present invention relates to the technical field of three-dimensional seismic isolation, in particular to a vertical variable-rigidity three-dimensional seismic isolation support. Background Art

[0002] Under the influence of earthquakes, some important equipment, such as medical equipment, substation cabinets, and cultural relic display cabinets, may be affected by the earthquake, resulting in reduced accuracy or damage. At the same time, a large number of earthquake records show that vertical seismic motion often exceeds horizontal seismic motion, so the impact of vertical seismic motion cannot be ignored.

[0003] At present, the rubber bearings widely used in engineering projects have no seismic isolation effect on vertical seismic motion. Therefore, the research of three-dimensional seismic isolation technology becomes necessary. However, the existing three-dimensional seismic isolation bearings have large vertical stiffness and high natural frequency, which cannot meet the needs of isolating low-frequency vibrations. Summary of the Invention

[0004] In response to the above problems, an embodiment of the present invention provides a vertical variable stiffness three-dimensional seismic isolation bearing.

[0005] One aspect of the implementation of the present invention provides a vertical variable stiffness three-dimensional seismic isolation bearing, including a laminated rubber seismic isolation bearing, the bottom surface of the laminated rubber seismic isolation bearing is connected to an upper connecting plate, a lower connecting plate is arranged below the upper connecting plate and parallel to the upper connecting plate, and vertical telescopic guide rods are evenly connected between the upper connecting plate and the lower connecting plate; a plurality of tracks are radially arranged on the top surface of the lower connecting plate, each track is provided with a slider, and a spring mechanism is hinged on the slider, the spring mechanism is vertically arranged and the top is hinged to the bottom surface of the upper connecting plate; a connecting rod is provided between the slider and the center position of the bottom surface of the upper connecting plate, and the two ends of the connecting rod are respectively hinged to the slider and the upper connecting plate.

[0006] Compared with the existing technology, the beneficial effects of the present invention are: the laminated rubber seismic isolation bearing, track, spring mechanism and connecting rod can meet the engineering requirements of isolating horizontal and vertical seismic motions, have higher vertical static stiffness and bearing capacity under static load, and the stiffness under dynamic load is variable, lower than the static stiffness, and has good vertical low-frequency seismic isolation effect.

[0007] Optionally, the radiation centers of multiple tracks coincide with the center of the lower connecting plate, and the multiple tracks are connected in a cross shape through an intermediate connecting block. An end connecting block is provided at the outer end of each track, and the slider on each track is at an equal distance from the radiation center.

[0008] Optionally, the spring mechanism includes a cylindrical sleeve, a coil spring is arranged in the cylindrical sleeve, and universal hinges are arranged at both ends of the cylindrical sleeve.

[0009] Optionally, universal joints are provided at both ends of the connecting rod, and the connecting rod is respectively connected to the slider and the upper connecting plate through the universal joints.

[0010] Optionally, the vertical telescopic guide rod is arranged between the four corners of the upper connecting plate and the lower connecting plate, and the vertical telescopic guide rod includes a vertical guide rod arranged on the upper connecting plate and a vertical sleeve arranged on the lower connecting plate, and the vertical guide rod is inserted into the vertical sleeve.

[0011] Optionally, the laminated rubber seismic isolation bearing is connected to the upper connecting plate by bolts, and the rubber layer and the steel plate in the laminated rubber seismic isolation bearing are circular or square in shape. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of this application, and do not constitute a limitation of the present invention. In the drawings:

[0013] Figure 1 A schematic diagram of the three-dimensional structure of a vertical variable stiffness three-dimensional seismic isolation bearing provided by an embodiment of the present invention;

[0014] Figure 2 A schematic diagram of the main cross-sectional structure of a vertical variable stiffness three-dimensional seismic isolation bearing provided by an embodiment of the present invention;

[0015] Figure 3 A schematic structural diagram of a track portion provided by an embodiment of the present invention;

[0016] Figure 4 A schematic diagram of the three-dimensional structure of a spring mechanism provided in an embodiment of the present invention;

[0017] Figure 5 A schematic cross-sectional view of a spring mechanism provided in an embodiment of the present invention;

[0018] Figure 6 A schematic structural diagram of a connecting rod portion provided in an embodiment of the present invention.

[0019] Among them, there are laminated rubber seismic isolation bearing 1, upper connecting plate 2, lower connecting plate 3, vertical telescopic guide rod 4, track 5, slider 6, spring mechanism 7, connecting rod 8, middle connecting block 9, end connecting block 10, cylindrical sleeve 11, coil spring 12, and universal hinge 13. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0021] See also Figure 1 and Figure 2, an embodiment of the present invention provides a vertical variable stiffness three-dimensional seismic isolation bearing, including a laminated rubber seismic isolation bearing 1, the bottom surface of the laminated rubber seismic isolation bearing 1 is connected to an upper connecting plate 2, and a lower connecting plate 3 is arranged below the upper connecting plate 2 and in parallel with the upper connecting plate 2, and vertical telescopic guide rods 4 are evenly connected between the upper connecting plate 2 and the lower connecting plate 3; a plurality of tracks 5 are radially arranged on the top surface of the lower connecting plate 3, each track 5 is provided with a slider 6, and a spring mechanism 7 is hinged on the slider 6, which is vertically arranged and the top is hinged to the bottom surface of the upper connecting plate 2; a connecting rod 8 is provided between the slider 6 and the center position of the bottom surface of the upper connecting plate 2, and the two ends of the connecting rod 8 are respectively hinged to the slider 6 and the upper connecting plate 2.

[0022] In implementation, see Figure 3 The radiation centers of the multiple tracks 5 coincide with the center of the lower connecting plate 3. The multiple tracks 5 are connected in a cross shape through the intermediate connecting block 9. The outer end of each track 5 is provided with an end connecting block 10. The slider 6 on each track 5 is at an equal distance from the radiation center. The intermediate connecting block 9 and the end connecting block 10 can prevent the slider 6 from derailing.

[0023] See also Figure 4 and Figure 5 The spring mechanism 7 includes a cylindrical sleeve 11, a coil spring 12 is arranged in the cylindrical sleeve 11, and universal hinges 13 are provided at both ends of the cylindrical sleeve 11; during manufacturing, the two ends of the coil spring 12 can be ground flat, pre-compressed and placed in the cylindrical sleeve 11, and the two ends of the cylindrical sleeve 11 are connected to the universal hinge 13 with bolts, and the other side of the universal hinge 13 is connected to the upper connecting plate 2 and the slider 6 with bolts; under static load, the spring mechanism 7 remains in a vertical state, which is equivalent to an ordinary coil spring. When vibration occurs, the connecting rod 8 drives the spring mechanism 7 to tilt, and a force with negative stiffness characteristics is generated by the connecting rod 8, which is jointly borne by the vertical force generated by the coil spring 12.

[0024] See also Figure 6 Universal hinges 13 are provided at both ends of the connecting rod 8, and the connecting rod 8 is connected to the slider 6 and the upper connecting plate 2 respectively through the universal hinges 13.

[0025] In implementation, the vertical telescopic guide rod 4 is arranged between the four corners of the upper connecting plate 2 and the lower connecting plate 3. The vertical telescopic guide rod 4 includes a vertical guide rod arranged on the upper connecting plate 2 and a vertical sleeve arranged on the lower connecting plate 3. The vertical guide rod is inserted into the vertical sleeve and the two are clearance-matched to ensure that the vertical seismic isolation bearing at the bottom of the laminated rubber seismic isolation bearing 1 remains vertical during movement without lateral displacement.

[0026] The laminated rubber seismic isolation bearing 1 is connected to the upper connecting plate 2 by bolts. The rubber layer and steel plate in the laminated rubber seismic isolation bearing 1 are circular or square in shape. The bearing is symmetrical in all directions as a whole, and the connections between the various components can be made by bolt connection, thereby improving the installation efficiency through the bolt assembly connection method.

[0027] The embodiment of the present invention provides a vertical variable stiffness three-dimensional seismic isolation bearing, in which the laminated rubber seismic isolation bearing 1 is connected in series with the vertical seismic isolation bearing part below it as a horizontal vibration component, and the two are decoupled from each other, and the horizontal and vertical movements do not interfere with each other; the vertical seismic isolation bearing part includes a spring mechanism 7, a connecting rod 8, and a track 5. In the initial state, the connecting rod 8 is not subjected to force, and the spring mechanism 7 is equivalent to an ordinary coil spring, which is only supported by the spring mechanism 7. When the ground vibrates and drives the lower connecting plate 3 up or down, the corresponding connecting rod 8 drives the slider 6 to slide, and the spring mechanism 7 tilts. The spring mechanism 7 and the connecting rod 8 are connected in parallel to realize the positive and negative stiffness parallel principle, that is, the stiffness of the vertical seismic isolation bearing part changes during vibration, which effectively reduces the vertical equivalent stiffness and is beneficial to low-frequency seismic isolation.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are included in the scope of protection of the present invention.

Claims

1. A vertical variable stiffness three-dimensional seismic isolation bearing, comprising a laminated rubber seismic isolation bearing, characterized in that: The bottom surface of the laminated rubber seismic isolation bearing is connected to an upper connecting plate, and a lower connecting plate is arranged below the upper connecting plate and in parallel with the upper connecting plate. Vertical telescopic guide rods are evenly connected between the upper connecting plate and the lower connecting plate; a plurality of tracks are radially arranged on the top surface of the lower connecting plate, and a slider is provided on each track. The slider is hinged with a spring mechanism, which is vertically arranged and hinged at the top to the bottom surface of the upper connecting plate; a connecting rod is provided between the slider and the center position of the bottom surface of the upper connecting plate, and the two ends of the connecting rod are respectively hinged to the slider and the upper connecting plate; The radiation centers of the multiple tracks coincide with the center of the lower connecting plate. The multiple tracks are connected in a cross shape through the middle connecting block. The outer end of each track is provided with an end connecting block. The distance between the slider on each track and the radiation center is equal. The spring mechanism comprises a cylindrical sleeve, a coil spring is arranged in the cylindrical sleeve, and universal hinges are arranged at both ends of the cylindrical sleeve; The vertical seismic isolation bearing part includes a spring mechanism, a connecting rod, and a track. The laminated rubber seismic isolation bearing is connected in series with the vertical seismic isolation bearing part below it as a horizontal vibration component. The two are decoupled from each other, and the horizontal and vertical movements do not interfere with each other. Under static load, the spring mechanism remains in a vertical state, which is equivalent to an ordinary coil spring and is only supported by the spring mechanism. When the ground vibrates and drives the lower connecting plate up or down, the corresponding connecting rod drives the slider to slide, and the spring mechanism tilts. The spring mechanism and the connecting rod are connected in parallel to realize the positive and negative stiffness parallel principle, that is, the stiffness of the vertical seismic isolation bearing part changes during vibration, which effectively reduces the vertical equivalent stiffness and is beneficial to low-frequency seismic isolation.

2. The vertical variable stiffness three-dimensional seismic isolation bearing according to claim 1, characterized in that: Universal joints are provided at both ends of the connecting rod, and the connecting rod is respectively connected to the slider and the upper connecting plate through the universal joints.

3. The vertical variable stiffness three-dimensional seismic isolation bearing according to claim 1, characterized in that: The vertical telescopic guide rod is arranged between the four corners of the upper connecting plate and the lower connecting plate. The vertical telescopic guide rod comprises a vertical guide rod arranged on the upper connecting plate and a vertical sleeve arranged on the lower connecting plate. The vertical guide rod penetrates into the vertical sleeve.

4. The vertical variable stiffness three-dimensional seismic isolation bearing according to claim 1, characterized in that: The laminated rubber seismic isolation bearing is connected to the upper connecting plate through bolts. The rubber layer and the steel plate in the laminated rubber seismic isolation bearing are circular or square in shape.

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