Friction pressure-bearing block for decoupling seismic isolation support and decoupling seismic isolation support

Abstract

The friction pressure-bearing block comprises an outer cylinder part and a nesting part, the outer cylinder part is a hollow cylinder body, and the nesting part extends from one end of an inner cavity of the hollow cylinder body to the other end of the inner cavity of the hollow cylinder body and is connected with the inner wall of the hollow cylinder body to form a multi-cavity body; and the height of the outer cylinder part is the same as that of the nesting part. According to the utility model, the pressure-bearing block adopts a multi-cavity form, so that the use of materials is reduced, and the pressure-bearing block is lighter and convenient to construct; meanwhile, the cost is reduced; according to different design requirements, a reasonable section form is adopted, and personalized design can be met; the pressure bearing body and the friction reset body are decoupled in two directions, the pressure bearing body provides supporting force for the upper structure, the friction reset body only provides friction force and reset force, and the later maintenance difficulty can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to a friction pressure-bearing block for a decoupling seismic isolation support and a decoupling seismic isolation support, belonging to the field of seismic isolation supports. Background Art

[0002] In traditional earthquake-resistant design, earthquake force is regarded as an additional load, which is combined with other loads acting on the structure for design calculation and to check whether the structure meets the design and use requirements, that is, to consume or resist earthquake energy through the ductile deformation of structural components and structures after yielding. Traditional design methods cannot take into account the self-regulation ability of the structure, making it impossible for the structure to provide safety protection when an earthquake strikes. When designing a structure for earthquake resistance under high intensity, if the plastic deformation of the structure and damage to the structural components are used as the cost, it will cause huge casualties and economic losses when an actual earthquake strikes.

[0003] In the modern society with rapid development of science and technology, the application of high-precision instruments has made people's lives more convenient, but at the same time, it has also made many buildings equipped with high-precision instruments such as hospitals, computer centers, industrial plants, etc. perform better in earthquakes, and the requirements for earthquake-resistant design have also increased accordingly. Continuing to use the traditional earthquake-resistant design method that relies on the building structure itself to resist earthquake energy cannot meet the requirements. At this time, seismic isolation design, a design method that can make the structure safer and more earthquake-resistant, has attracted the attention of scholars from all over the world. The seismic isolation structure adds special deformation and energy dissipation devices such as seismic isolation bearings and dampers. Seismic isolation bearings refer to the supporting devices set up by the structure to meet the seismic isolation requirements. It is to add a seismic isolation layer between the superstructure and the foundation, install rubber seismic isolation bearings, and achieve a soft connection with the ground.

[0004] Usually, the design pressure of rubber isolation bearings is only 10-15MPa due to the influence of materials. If isolation bearings are to be used in high-rise buildings, it is necessary to improve the processing methods of large-size isolation bearings. Then, problems such as the fully mature vulcanization of rubber and the testing of the horizontal performance of finished products before leaving the factory need to be solved. Problems such as production and inspection difficulties and difficulty in ensuring product quality also need to be solved. In addition, the bearings will also face the tensile stress caused by the huge overturning force of high-rise buildings during earthquakes. After exceeding the limit, a tensioning device needs to be installed separately. What follows is more difficult construction and expensive costs. Once the use time is too long, the rubber material will age to varying degrees. At this time, the performance of the rubber bearing will differ greatly from the expected design performance, making the structure no longer safe when an earthquake occurs. Similarly, once the rubber isolation bearing is installed, it will always be under high pressure and is prone to damage and other quality problems. Once a quality problem occurs and the bearing needs to be replaced, the entire building needs to be jacked up simultaneously. Its operation is unimaginable, so it can be said that the bearing is almost impossible to replace.

[0005] In view of this, the present utility model is proposed. Summary of the invention

[0006] The utility model provides a friction pressure block for a decoupling seismic isolation bearing. The friction pressure block for the decoupling seismic isolation bearing is constructed with a reasonable cross-sectional form, which can reduce the construction cost and save costs. It further provides a decoupling seismic isolation bearing, which, relying on the characteristics of the bearing itself and a reasonable cross-sectional form, can resist overturning moments without the need to install a separate tensile device. The rubber can be replaced without reinforcing or lifting the upper structure, thereby avoiding interruption of the structure's use function.

[0007] The technical solution of the utility model is:

[0008] According to the first aspect of the utility model, there is provided a friction pressure block for a decoupling seismic isolation bearing, comprising: an outer cylinder portion 11 and a nesting portion 12, wherein the outer cylinder portion 11 is a hollow cylinder, and the nesting portion 12 extends from one end of the inner cavity of the hollow cylinder to the other end and is connected to the inner wall of the hollow cylinder to form a multi-cavity; wherein the height of the outer cylinder portion 11 is the same as the height of the nesting portion 12.

[0009] The cross-sectional forms of the nested portion include, but are not limited to, a patch plate type, a field type, a cross frame type, an H type, a nested triangle type, a nested square type, a criss-cross type, and a nested circular ring type.

[0010] The nesting parts with cross-section forms of the patch plate type, field type, cross frame type, H type, nested triangle type, nested square type, and criss-cross type are designed with equal thickness as the outer cylinder part.

[0011] The patch plate types include a cross type, a large letter type, and a cross type.

[0012] The nested annular type comprises an inner cylinder portion and a rib portion. The inner cylinder portion is coaxially arranged with the outer cylinder portion, and the inner cylinder portion and the outer cylinder portion are connected via the rib portion arranged in the radial direction.

[0013] The nesting portion in the form of a nested circular ring cross-section and the outer cylinder portion are designed to be of equal thickness; or the thickness of the rib portion is smaller than that of the inner cylinder portion, and the inner cylinder portion and the outer cylinder portion are of equal thickness.

[0014] According to the second aspect of the utility model, a decoupling seismic isolation bearing is provided, comprising a friction reset body and a pressure-bearing body, wherein the pressure-bearing body comprises a polytetrafluoroethylene pad 8, a cover plate 9, and a friction pressure-bearing block 10 for the decoupling seismic isolation bearing; wherein the sliding friction surface 4 of the friction reset body is symmetrically fixed to the inner sides of the upper connecting plate 1 and the lower connecting plate 3 to form double-sided friction, the rubber 6 vulcanized on the rubber connecting plate 7 is symmetrically distributed at the four corners of the bearing, the rubber connecting plate 7 connects the upper connecting plate 1 and the middle connecting plate 2 arranged in parallel and the middle connecting plate 2 and the lower connecting plate 3 arranged in parallel; the middle connecting plate 2 has a central opening to allow the friction pressure-bearing block 10 for the decoupling seismic isolation bearing to pass through just right; the friction pressure-bearing block 10 for the decoupling seismic isolation bearing is buckled with a cover plate 9 with a slot on the upper and lower sides, and the polytetrafluoroethylene pad 8 is embedded in the groove of the cover plate.

[0015] The beneficial effects of the utility model are as follows: since the pressure-bearing block of the utility model adopts the form of multiple cavities, the use of materials is reduced, and it is lighter and easier to construct; at the same time, the cost is reduced; according to different design requirements, a reasonable cross-sectional form is adopted to meet personalized design; the pressure-bearing body and the friction reset body are bidirectionally decoupled, the pressure-bearing body provides support force for the upper structure, and the friction reset body only provides friction force and reset force, which can effectively reduce the difficulty of later maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure of a friction bearing block for a decoupling seismic isolation bearing in the form of a plate-type cross-section;

[0017] Figure 2 A schematic diagram of the structure of a friction bearing block for a decoupling seismic isolation bearing in the form of a field-shaped cross section;

[0018] Figure 3 A schematic diagram of the structure of a friction bearing block for a decoupling seismic isolation bearing in the form of a cross-frame cross section;

[0019] Figure 4 A schematic diagram of the friction bearing block structure for a decoupling seismic isolation bearing in the form of an H-shaped cross section;

[0020] Figure 5 A schematic diagram of the structure of a friction bearing block for a decoupling seismic isolation bearing in the form of a nested triangular cross section;

[0021] Figure 6 A schematic diagram of the structure of a friction bearing block for a decoupling seismic isolation bearing in a nested U-shaped cross-section form;

[0022] Figure 7 A schematic diagram of the structure of a friction bearing block for a decoupling seismic isolation bearing in the form of a nested circular ring cross section;

[0023] Figure 8 A schematic diagram of the friction bearing block structure for a decoupling seismic isolation bearing in a crisscross cross-section form;

[0024] Fig. 9 Axonometric view of the friction bearing block used for the equal-thickness nested circular ring type decoupling isolation bearing;

[0025] Fig.10 It is a schematic diagram of the decoupling isolation bearing structure;

[0026] Fig.11 This is the axonometric drawing of the pressure-bearing body of the utility model;

[0027] Fig.12 This is a cross-sectional schematic diagram of the cover plate of the utility model;

[0028] Fig.13 The stress cloud diagram of the friction bearing block used for decoupling isolation bearings with equal wall thickness and different cross-section forms;

[0029] Fig.14 It is the stress cloud diagram of the nested circular ring-shaped cavity-type pressure-bearing block with unequal wall thickness;

[0030] The numbers in the figure are: 1. upper connecting plate; 2. middle connecting plate; 3. lower connecting plate; 4. sliding friction surface; 5. pressure-bearing body; 6. rubber; 7. rubber connecting plate; 8. polytetrafluoroethylene pad; 9. cover plate; 10. friction pressure block for decoupling seismic isolation bearing; 11. outer cylinder; 12. nesting part. DETAILED DESCRIPTION

[0031] The utility model is further described below in conjunction with the accompanying drawings and embodiments, but the content of the utility model is not limited to the described scope.

[0032] Example 1: Figure 1-14 As shown, according to the first aspect of an embodiment of the utility model, there is provided a friction pressure block for a decoupling seismic isolation bearing, comprising: an outer cylinder portion 11 and a nesting portion 12, wherein the outer cylinder portion 11 is a hollow cylinder, and the nesting portion 12 extends from one end of the inner cavity of the hollow cylinder to the other end and is connected to the inner wall of the hollow cylinder to form a multi-cavity; wherein the height of the outer cylinder portion 11 is the same as the height of the nesting portion 12, and the height of the outer cylinder portion 11 is the height in the axial direction.

[0033] Furthermore, the nested portion adopts one of a variety of cross-sectional forms, including but not limited to: a patch plate type, a field type, a cross frame type, an H type, a nested triangle type, a nested square type, a crisscross type, and a nested ring type. Figure 1-8 Various cross-sectional forms are shown but not limited to those shown.

[0034] Furthermore, the nesting parts of the cross-section forms of the patch plate type, field type, cross frame type, H type, nested triangle type, nested square type, and criss-cross type are designed with equal thickness as the outer cylinder part.

[0035] Further, the batten type includes a cross shape, a large character shape, and a rice character shape. For example, Figure 1 The cross shape formed by the four rib plates shown in it, or the large character shape formed by five rib plates, the rice character shape formed by eight rib plates, etc. When the outer diameter dimension of the friction bearing block for the decoupled seismic isolation bearing changes: the number of triangles in the nested triangle type can be appropriately adjusted, such as nesting one, three, six, etc. (the inner embedded vertices are connected to the outer edges); the number of squares in the nested square type can be appropriately adjusted, such as nesting one, three, six, etc. (the inner embedded vertices are connected to the outer edges); the number of inner cylinder parts in the nested ring type can be appropriately adjusted, such as nesting one, three, six, etc., and the number of rib parts can also be appropriately adjusted, such as six, eight, etc.; the number of longitudinal plates and transverse plates in the crisscross type can be appropriately adjusted, such as three, six in both longitudinal and transverse directions, etc.

[0036] Further, the nested ring type includes an inner cylinder part and rib parts. The inner cylinder part is coaxially arranged with the outer cylinder part, and the inner cylinder part and the outer cylinder part are connected by rib parts arranged along the radial direction.

[0037] Further, the nested part of the nested ring type cross-section form and the outer cylinder part adopt an equal-thickness design; or the thickness of the rib part is less than that of the inner cylinder part, and the inner cylinder part and the outer cylinder part have the same thickness.

[0038] For example, Figure 10-12 As shown, according to the second aspect of the embodiments of the present invention, a decoupled seismic isolation bearing is provided, which includes a friction restoring body and a bearing body 5. The friction restoring body includes an upper connecting plate 1, a middle connecting plate 2, a lower connecting plate 3, a sliding friction surface 4, rubber 6, and a rubber connecting plate 7. The bearing body includes a polytetrafluoroethylene pad 8, a cover plate 9, and a friction bearing block 10 for the decoupled seismic isolation bearing. Among them, the octahedral sliding friction surface 4 of the friction restoring body is symmetrically welded to the inner sides of the upper connecting plate 1 and the lower connecting plate 3 to form double-sided friction. The rubber 6 vulcanized on the rubber connecting plate 7 is symmetrically distributed at the four corners of the bearing. The rubber connecting plate 7 is connected to the upper connecting plate 1 and the middle connecting plate 2 arranged in parallel and the middle connecting plate 2 and the lower connecting plate 3 arranged in parallel by high-strength bolts. A central hole is opened in the middle connecting plate 2 so that the friction bearing block 10 for the decoupled seismic isolation bearing just passes through. The friction bearing block 10 for the decoupled seismic isolation bearing is buckled with cover plates 9 with card slots on both the upper and lower sides, and polytetrafluoroethylene pads 8 are embedded in the cover plate grooves. The bearing body and the friction restoring body are decoupled bidirectionally. The bearing body provides a supporting force for the upper structure, and the friction restoring body only provides frictional force and restoring force.

[0039] Further, as Fig.11 、 12 shown, both the upper and lower sides of the cover plate 9 are grooved. The upper groove embeds the polytetrafluoroethylene pad 8, and the lower groove buckles on both the upper and lower sides of the friction bearing block 10 for the decoupled seismic isolation bearing (it should be noted that when the cover plate 9 cooperates with the lower end of the friction bearing block 10 for the decoupled seismic isolation bearing, then Fig.12 Designed to be installed upside down).

[0040] Furthermore, the friction bearing block 10 for the decoupling seismic isolation bearing is processed by welding or casting.

[0041] In order to better illustrate the performance of the utility model, the thickness of the pressure block is designed according to the "Steel Structure Design Standard" so that all cross-sectional forms meet the design requirements, and the friction pressure block used for the decoupling seismic isolation bearing is numerically simulated using ABAQUS software. The model parameters are as follows: the diameter of the friction pressure block used for the decoupling seismic isolation bearing is 400mm, the thickness of the outer cylinder and the nesting part are both 30mm, the height of the friction pressure block used for the decoupling seismic isolation bearing is 170mm, the Young's modulus is 200000MPa, the Poisson's ratio is 0.3, the yield strength is 235MPa, the plastic strain is 0, the vertical surface pressure is 25MPa, and the bottom is completely fixed. The simulation results of different cross-sectional forms are shown as follows: Fig.13 As shown, through Fig.13 It can be explained as follows ( Fig.13 Among them, (a) is a solid section type, (b) is a plate-type section type with equal wall thickness, (c) is a field-shaped section type with equal wall thickness, (d) is a cross-frame-shaped section type with equal wall thickness, (e) is an H-shaped section type with equal wall thickness, (f) is a nested triangle-shaped section type with equal wall thickness, (g) is a nested square-shaped section type with equal wall thickness, (h) is a criss-cross section type with equal wall thickness, and (i) is a nested circular section type with equal wall thickness):

[0042] From the above results, we can know that:

[0043] 1) When meeting the requirements of relevant specifications, only the cross-sectional form is different, the stress distribution of the solid section and the plate-type, nested triangle type, criss-cross type, field type, cross frame type, and nested square type pressure blocks are similar, all of which have smaller central stress, larger outer stress, and more uneven force. However, the rigid pressure-bearing body of the solid section uses more steel than the friction pressure-bearing block used for the decoupling isolation bearing.

[0044] 2) The stress distribution of the friction bearing blocks used in the decoupling isolation bearings with H-shaped and nested circular ring cross-sections is relatively uniform, which meets the design requirement of uniform stress on the friction bearing blocks 10 used in the decoupling isolation bearings, and the material consumption is relatively small and the processing is relatively convenient.

[0045] In order to further highlight the characteristics of the different designs of the nested annular type, the simulation results of the nested annular type are further given when the thickness of the rib is less than that of the inner cylinder and the inner cylinder and the outer cylinder are of equal thickness. Fig.14As shown (the model parameters are as follows: the diameter of the friction bearing block used for the decoupling isolation bearing is 400mm, the thickness of the inner and outer cylinders is 30mm, the thickness of the ribs is 20mm, the height of the friction bearing block used for the decoupling isolation bearing is 170mm, the Young's modulus is 200000MPa, the Poisson's ratio is 0.3, the yield strength is 235MPa, the plastic strain is 0, the vertical surface pressure is 25MPa, and the bottom is completely fixed.). Fig.13 , 14 From the comparison, it can be seen that although the unequal wall thickness nested circular ring type uses less material than the equal wall thickness nested circular ring type, the stress difference of the equal wall thickness nested circular ring type is smaller and the stress distribution is more uniform. Therefore, the equal wall thickness nested circular ring type design is more reasonable. However, it should be noted that in cases where the bearing capacity requirements are lower, the unequal wall thickness nested circular ring type can also be used, which saves more material and is easier to weld.

[0046] The specific implementation modes of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above implementation modes, and various changes can be made within the knowledge scope of ordinary technicians in the field without departing from the purpose of the present invention.

Claims

1. A friction bearing block for a decoupling seismic isolation support, characterized in that: include: An outer cylinder portion (11) and a nesting portion (12), wherein the outer cylinder portion (11) is a hollow cylinder, and the nesting portion (12) is arranged to extend from one end of the inner cavity of the hollow cylinder to the other end and is connected to the inner wall of the hollow cylinder to form a multi-cavity body; wherein the height of the outer cylinder portion (11) is the same as the height of the nesting portion (12).

2. The friction bearing block for the decoupling seismic isolation support according to claim 1 is characterized in that: The cross-sectional forms of the nested portion include: a patch plate type, a field type, a cross frame type, an H type, a nested triangle type, a nested square type, a criss-cross type, and a nested circular ring type.

3. The friction bearing block for the decoupling seismic isolation support according to claim 2 is characterized in that: The nesting parts with cross-section forms of the patch plate type, field type, cross frame type, H type, nested triangle type, nested square type, and criss-cross type are designed with equal thickness as the outer cylinder part.

4. The friction bearing block for the decoupling seismic isolation support according to claim 2 is characterized in that: The patch plate types include a cross type, a large letter type, and a cross type.

5. The friction bearing block for the decoupling seismic isolation support according to claim 2 is characterized in that: The nested annular type comprises an inner cylinder portion and a rib portion. The inner cylinder portion is coaxially arranged with the outer cylinder portion, and the inner cylinder portion and the outer cylinder portion are connected via the rib portion arranged in the radial direction.

6. The friction bearing block for the decoupling seismic isolation support according to claim 5 is characterized in that: The nesting portion in the form of a nested circular ring cross-section and the outer cylinder portion are designed to be of equal thickness; or the thickness of the rib portion is smaller than that of the inner cylinder portion, and the inner cylinder portion and the outer cylinder portion are of equal thickness.

7. A decoupling seismic isolation support, comprising a friction reset body and a pressure bearing body, characterized in that: The pressure-bearing body comprises a polytetrafluoroethylene pad (8), a cover plate (9), and a friction pressure-bearing block (10) for a decoupling and seismic isolation support; wherein the sliding friction surface (4) of the friction reset body is symmetrically fixed to the inner sides of the upper connecting plate (1) and the lower connecting plate (3) to form double-sided friction; the rubber (6) vulcanized on the rubber connecting plate (7) is symmetrically distributed at the four corners of the support; the rubber connecting plate (7) connects the upper connecting plate (1) and the middle connecting plate (2) arranged in parallel, and the middle connecting plate (2) and the lower connecting plate (3) arranged in parallel; the middle connecting plate (2) has a central opening to allow the friction pressure-bearing block (10) for the decoupling and seismic isolation support to pass through; the friction pressure-bearing block (10) for the decoupling and seismic isolation support is buckled with a cover plate (9) with a slot on the upper and lower sides, and the polytetrafluoroethylene pad (8) is embedded in the groove of the cover plate.

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