Isolation bearing

Abstract

This invention provides a seismic isolation bearing, comprising an upper cover plate and a lower cover plate arranged parallel to each other. An upper connecting plate is fixedly attached to the bottom surface of the upper cover plate, and a lower connecting plate is fixedly attached to the top surface of the lower cover plate. Steel plates and rubber sheets are stacked and spaced apart between the upper and lower connecting plates. The bearing also includes a cylindrical friction damper disposed between the upper and lower cover plates. The cylindrical friction dampers are symmetrically distributed on the outer sides of the steel plates and rubber sheets, with the line connecting the centers of the upper and lower cover plates as the centerline. Both ends of the cylindrical friction damper are connected to the upper and lower cover plates via universal joints. The solution provided by this invention can improve the functionality, reliability, and safety of the seismic isolation structure, and increase vibration reduction efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of seismic isolation, and in particular to a seismic isolation support. Background Art

[0002] The existing lead-core rubber bearing has a lead core in the middle part. Under frequent earthquakes, the shear stiffness is large, and the natural vibration period of the isolation structure is difficult to further extend, and the isolation effect is poor. At the same time, under earthquakes, the equivalent damping ratio provided by the lead-core rubber bearing decreases continuously with the increase of earthquake intensity, and the equivalent stiffness also decreases continuously, resulting in a decrease in energy dissipation capacity and insufficient recovery force under rare earthquakes.

[0003] Although the existing laminated rubber bearings can provide sufficiently low isolation layer stiffness, they will greatly increase the lateral displacement under earthquakes, thereby increasing the width of the isolation trench.

[0004] In the related art, there is a situation of mixed use of lead core rubber bearings and laminated rubber bearings to provide a larger damping ratio under frequent earthquakes. However, when used in combination, the damping ratio under medium and large earthquake conditions will decrease with the increase of the lateral displacement of the isolation layer, and the restoring force is insufficient, resulting in uneven isolation effects when encountering frequent earthquakes and rare earthquakes. Summary of the invention

[0005] In view of the above problems, an embodiment of the present invention provides a seismic isolation bearing.

[0006] One aspect of the implementation of the present invention provides a seismic isolation bearing, including an upper cover plate and a lower cover plate arranged relatively parallel to each other, the bottom surface of the upper cover plate is fitted and fixed with a bearing upper connecting plate, the top surface of the lower cover plate is fitted and fixed with a bearing lower connecting plate, and steel plates and rubber sheets are stacked and spaced between the bearing upper connecting plate and the bearing lower connecting plate; it also includes a cylindrical friction damper arranged between the upper cover plate and the lower cover plate, the cylindrical friction damper is symmetrically distributed on the outside of the steel plate and the rubber sheet with the line between the center of the upper cover plate and the center of the lower cover plate as the center line, and the two ends of the cylindrical friction damper are connected to the upper cover plate and the lower cover plate through universal hinges.

[0007] Compared with the prior art, the beneficial effects of the present invention are that the stacked steel plates and rubber sheets can provide high vertical stiffness, vertical bearing capacity and low horizontal stiffness, and the cylindrical friction dampers symmetrically distributed on the outside of the steel plates and rubber sheets can appropriately extend the natural vibration period of the isolation structure, and increase the damping force and equivalent stiffness of the isolation bearing when large lateral displacement occurs, increase the energy consumption index, and ensure the restoring force. The cooperation between the two can improve the functionality, reliability and safety of the isolation structure and improve the shock absorption efficiency.

[0008] Optionally, the cylinder-type friction damper includes an inner cylinder, a middle cylinder and an outer cylinder which are sequentially arranged from the inside to the outside, a sealing plate is provided at the bottom cylinder opening of the outer cylinder, an external friction inner tightener is provided on the inner wall of the top cylinder opening of the outer cylinder, and the outer friction inner tightener and the outer wall of the middle cylinder slide and rub against each other during the process of the middle cylinder extending outward from the top cylinder opening of the outer cylinder; an internal friction outer expander is provided on the outer side of the bottom of the inner cylinder, and the internal friction outer expander and the inner wall of the middle cylinder slide and rub against each other during the process of the inner cylinder extending outward from the top cylinder opening of the middle cylinder, and universal hinges are installed on the outer side of the bottom of the sealing plate and the top of the inner cylinder.

[0009] Optionally, an inner guide rail is arranged on the inner wall of the outer tube, a seat plate is arranged at the bottom opening of the middle tube, and an opening matching the inner guide rail is opened on the seat plate.

[0010] Optionally, an outer guide rail is provided on the outer wall of the inner tube, a sealing ring is provided at the top opening of the middle tube, and an opening matching the outer guide rail is provided on the sealing ring.

[0011] Optionally, the external friction inner tightener comprises a split fixing ring, an external friction plate is fitted on the inner side of the split fixing ring, and a baffle ring is arranged on the side of the split fixing ring away from the top tube opening of the outer tube.

[0012] Optionally, the internal friction external expander includes a conical wedge block fixed to the outer side of the bottom of the inner cylinder by fastening bolts, an inner wedge sleeve is sleeved on the outer side of the conical wedge block, and an inner friction plate is sleeved on the outer side of the inner wedge sleeve.

[0013] Optionally, the steel plate and the rubber sheet are circular plate structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of the present application, and do not constitute a limitation of the present invention. In the drawings:

[0015] Figure 1 A cross-sectional view of an initial state of compression of a seismic isolation support provided by an embodiment of the present invention;

[0016] Figure 2 A schematic diagram of the initial state structure of a cylindrical friction damper provided by an embodiment of the present invention;

[0017] Figure 3 A schematic diagram of the structure of a cylindrical friction damper in an extended state provided by an embodiment of the present invention;

[0018] Figure 4 for Figure 3 Sectional view at AA;

[0019] Figure 5 for Figure 3 Sectional view at the middle BB;

[0020] Figure 6A schematic diagram of the three-dimensional structure of a seismic isolation bearing provided in an embodiment of the present invention.

[0021] Among them, the upper cover plate 1, the lower cover plate 2, the upper connecting plate of the support 3, the lower connecting plate of the support 4, the steel plate 5, the rubber sheet 6, the cylindrical friction damper 7, the universal hinge 8, the inner cylinder 9, the middle cylinder 10, the outer cylinder 11, the sealing plate 12, the external friction inner tightener 13, the internal friction outer expander 14, the inner guide rail 15, the seat plate 16, the outer guide rail 17, the sealing ring 18, the separate fixing ring 19, the outer friction plate 20, the baffle ring 21, the fastening bolts 22, the conical wedge block 23, the inner wedge sleeve 24, and the inner friction plate 25. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution 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 illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0023] See also Figure 1 An embodiment of the present invention provides a seismic isolation bearing, comprising an upper cover plate 1 and a lower cover plate 2 which are arranged relatively parallel to each other, a bearing upper connecting plate 3 is bonded and fixed to the bottom surface of the upper cover plate 1, a bearing lower connecting plate 4 is bonded and fixed to the top surface of the lower cover plate 2, and steel plates 5 and rubber sheets 6 are stacked and spaced between the bearing upper connecting plate 3 and the bearing lower connecting plate 4, so as to constitute a stacked rubber bearing structure; in addition, it also comprises a cylindrical friction damper 7 arranged between the upper cover plate 1 and the lower cover plate 2, the cylindrical friction damper 7 is symmetrically distributed on the outside of the steel plate 5 and the rubber sheet 6 with the connecting line between the center of the upper cover plate 1 and the center of the lower cover plate 2 as the center line, and the two ends of the cylindrical friction damper 7 are connected to the upper cover plate 1 and the lower cover plate 2 through universal hinges 8.

[0024] In implementation, see Figure 2 , Figure 3 , Figure 4 and Figure 5 The cylindrical friction damper 7 comprises an inner cylinder 9, a middle cylinder 10 and an outer cylinder 11 which are sequentially sleeved from the inside to the outside. A sealing plate 12 is provided at the bottom of the outer cylinder 11. An outer friction inner tightener 13 is provided on the inner wall of the top cylinder opening of the outer cylinder 11. When the middle cylinder 10 extends outward from the top cylinder opening of the outer cylinder 11, the outer friction inner tightener 13 slides and rubs against the outer wall of the middle cylinder 10; an inner friction outer expander 14 is provided at the outer side of the bottom of the inner cylinder 9. When the inner cylinder 9 extends outward from the top cylinder opening of the middle cylinder 10, the inner friction outer expander 14 slides and rubs against the inner wall of the middle cylinder 10. A universal hinge 8 is installed at the outer side of the bottom of the sealing plate 12 and the top of the inner cylinder 9;

[0025] The three sleeves are connected in three stages to achieve a horizontal displacement corresponding to the 350%-450% shear side displacement angle of the laminated rubber bearing, so as to generate increasing friction resistance within the maximum side displacement range of the laminated rubber bearing and obtain increasing equivalent stiffness; the universal hinge 8 can ensure that the cylindrical friction damper 7 can use the large-scale horizontal displacement between the upper and lower cover plates of the laminated rubber bearing in any direction along the plane;

[0026] In addition, during the mutual sliding process of the three-section cylinder structure, the axis of the damper is continuously lengthened and tilted due to the connection method of the universal hinge, so that the friction force generated in the damper is continuously converted into horizontal shear resistance. The shear resistance and equivalent stiffness increase with the increase of the horizontal lateral displacement of the upper and lower cover plates, becoming a shock-absorbing device with variable damping and variable stiffness.

[0027] An inner guide rail 15 is arranged on the inner wall of the outer cylinder 11 , and a seat plate 16 is arranged at the bottom opening of the middle cylinder 10 . An opening matching the inner guide rail 15 is opened on the seat plate 16 .

[0028] An outer guide rail 17 is arranged on the outer wall of the inner cylinder 9, and a sealing ring 18 is arranged at the top of the middle cylinder 10. The sealing ring 18 is provided with an opening adapted to the outer guide rail 17. By setting the guide rail structure, it is ensured that each cylinder rod can move smoothly in the axial direction, thereby enhancing the stability of the expansion and contraction process of the cylinder friction damper 7.

[0029] The external friction inner tightener 13 includes a separate fixing ring 19, an external friction plate 20 is fitted on the inner side of the separate fixing ring 19, and a baffle ring 21 is arranged on the side of the separate fixing ring 19 away from the top tube mouth of the outer tube; the baffle ring 21 can be fixed to the inner wall of the outer tube, and the fixing ring fastening bolts are screwed into the separate fixing ring 19 from the outside of the baffle ring 21 to fix the separate fixing ring 19.

[0030] The internal friction external expander 14 includes a conical wedge block 23 fixed to the outer side of the bottom of the inner tube by a fastening bolt 22, an inner wedge sleeve 24 is sleeved on the outer side of the conical wedge block 23, and an inner friction plate 25 is sleeved on the outer side of the inner wedge sleeve 24; the inner wedge sleeve 24 can adopt a three-petal structure.

[0031] In practice, the steel plate 5 and the rubber sheet 6 may adopt a circular plate structure, such as Figure 6 It is a schematic diagram of the three-dimensional structure of the seismic isolation support when the steel plate 5 and the rubber sheet 6 adopt a circular plate structure.

[0032] The coordinated force bearing and force transmission path of the seismic isolation bearing provided in the embodiment of the present invention are as follows: the laminated rubber bearing mainly bears the vertical pressure and tension and provides a relatively low horizontal stiffness; the symmetrically distributed cylindrical friction damper 7 mainly bears the shear friction resistance under the condition of horizontal shear displacement, and its value increases with the increase of horizontal shear displacement, while providing a gradually increasing equivalent stiffness; wherein the friction force transmission path of the cylindrical friction damper 7 during the gradually increasing displacement is as follows: the upper cover plate 1 moves → the upper universal hinge 8 moves → the inner cylinder 9 slides → the inner friction plate 25 generates friction resistance along the cylinder axis → the inner cylinder 9 drives the middle cylinder 10 to move → friction resistance is generated between the outer friction plate 20 and the middle cylinder 10 → at the same time, the axis of the friction damper 7 is continuously tilted → the friction damping force is converted into continuously increasing horizontal resistance and vertical resistance.

[0033] When manufacturing a cylindrical friction damper, the inner cylinder 9, the fastening bolts 22, the conical wedge block 23 and the inner wedge sleeve 24 can be manufactured according to the design size, and the inner friction plate is pasted on the outer side of the inner wedge sleeve 24. Then, the inner friction outer expander 14 is assembled by using the fastening bolts 22, the conical wedge block 23 and the inner wedge sleeve 24 and installed on the bottom of the inner cylinder 9, and the outer guide rail 17 is welded on the outer wall of the inner cylinder 9.

[0034] The middle cylinder 10 is manufactured according to the design size, a plate 16 is welded to the bottom opening of the middle cylinder 10, and an opening for the inner guide rail 15 to pass through is arranged at its edge, a sealing ring 18 is arranged at the top opening of the middle cylinder 10, and an opening for the outer guide rail 17 to pass through is arranged at the inner edge of the sealing ring 18;

[0035] Insert the inner tube 9 into the middle tube 10, tighten the fastening bolts 22 to the design requirements, and install the universal hinge at the top of the inner tube 9;

[0036] The outer cylinder 11 is manufactured according to the designed dimensions, a separate fixing ring 19 is arranged inside the top of the outer cylinder 11, and a baffle ring 21 is fixed on one side of the separate fixing ring 19, the fixing ring fastening bolts are screwed in to clamp the separate fixing ring 19, and an outer friction plate 20 is glued to the inner side of the separate fixing ring 19; the assembled inner cylinder 9 and middle cylinder 10 are inserted into the outer cylinder, and the bottom of the outer cylinder is sealed with a sealing plate to complete the manufacturing.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A seismic isolation support, comprising an upper cover plate and a lower cover plate arranged relatively parallel to each other, the bottom surface of the upper cover plate is fitted and fixed with a support upper connecting plate, the top surface of the lower cover plate is fitted and fixed with a support lower connecting plate, and steel plates and rubber sheets are stacked and spaced between the support upper connecting plate and the support lower connecting plate; characterized in that: It also includes a cylindrical friction damper arranged between the upper cover plate and the lower cover plate, the cylindrical friction damper is symmetrically distributed on the outer side of the steel plate and the rubber sheet with the connection line between the center of the upper cover plate and the center of the lower cover plate as the center line, and the two ends of the cylindrical friction damper are connected to the upper cover plate and the lower cover plate through a universal hinge; The cylindrical friction damper comprises an inner cylinder, a middle cylinder and an outer cylinder which are sequentially sleeved from the inside to the outside. A sealing plate is provided at the bottom opening of the outer cylinder, and an external friction inner tightener is provided on the inner wall of the top opening of the outer cylinder. When the middle cylinder extends outward from the top opening of the outer cylinder, the external friction inner tightener slides and rubs against the outer wall of the middle cylinder. An inner friction outer expander is arranged on the outer side of the bottom of the inner tube. When the inner tube extends outward from the top tube opening of the middle tube, the inner friction outer expander slides and rubs against the inner wall of the middle tube. Universal hinges are installed on the outer side of the bottom of the sealing plate and the top of the inner tube. The steel plate and the rubber sheet are circular plate structures.

2. The seismic isolation support according to claim 1, characterized in that: An inner guide rail is arranged on the inner wall of the outer tube, a seat plate is arranged at the bottom opening of the middle tube, and an opening matched with the inner guide rail is opened on the seat plate.

3. The seismic isolation support according to claim 1, characterized in that: An outer guide rail is arranged on the outer wall of the inner cylinder, a sealing ring is arranged at the top of the middle cylinder, and an opening matched with the outer guide rail is opened on the sealing ring.

4. The seismic isolation support according to claim 1, characterized in that: The external friction inner tightener comprises a separate fixing ring, an external friction plate is fitted on the inner side of the separate fixing ring, and a baffle ring is arranged on the side of the separate fixing ring away from the top tube opening of the outer tube.

5. The seismic isolation support according to claim 1, characterized in that: The internal friction external expander comprises a conical wedge fixed to the outer side of the bottom of the inner cylinder by fastening bolts, an inner wedge sleeve is sleeved on the outer side of the conical wedge, and an inner friction plate is sleeved on the outer side of the inner wedge sleeve.

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