KR102316412B1 - Isolataion system with damping - Google Patents

Abstract

The disclosed content relates to a seismic isolator installed in a structure such as a building, computer equipment, or other equipment, and relates to a technology for attenuating vibration by physically isolating the structure from the ground or floor surface.
More specifically, there is provided a vibration isolator for damping vibration, comprising: a lower plate including a first curved portion depressed to have a predetermined curvature inward of the upper surface; and a second curved portion depressed to have a predetermined curvature inward of the lower surface. A seismic isolator including an upper plate and a ball interposed between the first curved portion of the lower plate and the second curved portion of the lower plate is provided as an embodiment.

Description

Seismic isolation system with damping added {ISOLATAION SYSTEM WITH DAMPING}

The disclosed content relates to a seismic isolating system installed in a structure such as a building, computer equipment, or other equipment, and relates to a technology for attenuating vibration by physically isolating the ground or floor surface and the structure.

Unless otherwise indicated herein, the material described in this section is not prior art to the claims of this application, and inclusion in this section is not an admission that it is prior art.

Recently, many earthquakes have occurred at home and abroad, causing a lot of damage to structures such as buildings and other facilities. In order to prevent damage caused by such an earthquake, earthquake-resistant, seismic suppression and seismic isolation technologies are being developed. Seismic resistance is a technology that improves the rigidity and flexibility of a building or structure so that it can resist seismic forces. It is a technology to control structures by changing damping, etc.

However, although earthquake resistance and vibration suppression reduce the damage caused by earthquakes, the vibration itself is transmitted to the structure, so damage due to fatigue cannot but be considered.

The technology to solve this is seismic isolation technology. Seismic isolation refers to a technology for separating the ground from the structure (base isolation) by installing a shear deformation device between the building or structure and the ground. Through this, it is possible to artificially lengthen the natural period of a structure during an earthquake to prevent resonance between the earthquake and the structure, so that the seismic force is relatively weakly transmitted to the structure. This seismic isolation technology is applied not only to buildings and large structures, but also to indoor communication equipment and electrical and electronic control systems to prevent damage caused by earthquakes.

Korean Patent Publication No. 10-1178481 discloses a seismic isolator configured to separate movement of a lower plate and an upper plate by forming a plurality of cylindrical rollers in one layer and orthogonally stacking two roller layers. This prior art protects the structure by blocking the movement caused by the earthquake. However, there was a problem that vibration in a direction different from the roller direction could not be properly blocked by the frictional force of the roller, and vibration in the vertical direction could not be handled.

1. Korean Patent Publication No. 10-1178481

An object of the present invention is to provide a seismic isolation system to prevent damage to a structure due to an earthquake or the like.

In addition, it is not limited to the technical problems as described above, and it is obvious that another technical problem may be derived from the following description.

Disclosed is a seismic isolator for damping vibration, a lower plate including a first curved portion depressed to have a predetermined curvature inward of the upper surface, and an upper portion including a second curved portion depressed to have a predetermined curvature inward of the lower surface. A seismic isolator including a plate and a ball interposed between the first curved portion of the lower plate and the second curved portion of the lower plate is provided as an embodiment.

According to the disclosed embodiment, it is possible to provide a seismic isolator capable of canceling vibrations in various directions, preventing the ball from protruding, and recovering to an original position after the vibration stops.

Effects of the present embodiments are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a perspective view and an exploded view of a seismic isolator according to an embodiment of the present disclosure;
2 is a cross-sectional view of a seismic isolator according to an embodiment of the disclosed subject matter;
3 is a cross-sectional view and a state diagram of a ball caster according to an embodiment of the disclosed subject matter.
4 is a side view of a ball caster according to an embodiment of the present disclosure;
5 is a perspective view of a seismic isolator including a wire unit according to an embodiment of the present disclosure;
6 is an exploded view of a seismic isolator including a wire part according to an embodiment of the present disclosure;
7 is an exploded view of a seismic isolator including a magnetic material according to an embodiment of the present disclosure;
8 is a cross-sectional view of a seismic isolator including a rubber pad according to an embodiment of the present disclosure;
9 is a state diagram of a seismic isolating system including a plurality of seismic isolators according to an embodiment of the present disclosure;
10 is a perspective view of a seismic isolator according to another embodiment of the disclosed subject matter;
11 is an exploded perspective view of a seismic isolator according to another embodiment of the disclosed subject matter;
12 is a cross-sectional view of a seismic isolator according to another embodiment of the disclosed subject matter;
13 to 20 are experimental data showing a response ratio and a damping ratio in the seismic isolator according to an embodiment of the present disclosure;

Advantages and features of the present invention, and a method for achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains. It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

In describing the embodiments of the present invention, if it is determined that a detailed description of a well-known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, the terms to be described later are terms defined in consideration of functions in an embodiment of the present invention, which may vary according to intentions or customs of users and operators. Therefore, the definition should be made based on the content throughout this specification.

Hereinafter, a preferred embodiment of the improved seismic isolator will be described with reference to the accompanying drawings.

The seismic isolator disclosed herein includes a lower plate 10 including a first curved portion 11 recessed to have a predetermined curvature inward of the upper surface, and a second curved portion recessed to have a predetermined curvature inward of the lower surface. The ball 30 interposed between the first curved portion 11 of the upper plate 20 and the lower plate 10 and the second curved portion 21 of the lower plate 10 include

Referring to FIGS. 1 to 3 , the lower plate 10 is formed in a plate shape and includes a first curved portion 11 recessed to have a predetermined curvature inside the upper surface. The lower plate 10 may be formed in the shape of a square plate having a certain thickness, and may include a first curved portion 11 recessed into a concave shape inside the upper surface, but the lower plate 10 may not be penetrated. have.

The upper plate 20 has a plate shape and includes a second curved portion 21 recessed to have a predetermined curvature inside the lower surface. The upper plate 20 may also be formed in the shape of a square plate having a predetermined thickness, similarly to the lower plate 10, and includes a second curved portion 21 recessed into a concave shape inside the lower surface, but the upper plate 20 It can be formed so as not to be perforated.

The first curved portion 11 and the second curved portion 21 prevent the vibration transmitted to the lower plate 10 located on the ground and the bottom from being transmitted to the upper plate 20 through the ball 30 . is the composition When the first curved portion 11 and the second curved portion 21 are formed as a general plane rather than a curved surface, the position of the ball 30 interposed therebetween is not fixed, so the position of the ball 30 depends on the position of the ball 30 . The upper plate 20 and the lower plate 10 may be out of balance. On the other hand, in the case of forming a curved surface, the ball 30 returns to the center of the curved portion by the radius of curvature and gravity of the curved portion, and after the vibration stops, the position of the upper plate 20 and the lower plate 10 is fixed. can

However, even in the case of including the curved portion, in the case of strong vibration outside a certain range, the ball 30 may leave the curved portion and lose the seismic isolation function. Therefore, a configuration that prevents the ball 30 from leaving the curved portion is required. Accordingly, the periphery of the first curved portion 11 and the second curved portion 21 is formed in a circular shape, and the first curved portion 11 and the second curved portion 21 itself is depressed inside each plate. Thus, a step 40 may be formed on the outer periphery of the curved portion. As shown in FIG. 2 , each curved part itself is recessed into the plate so that a step 40 is formed on the outer periphery of the first curved part 11 and the second curved part 21 , so that strong vibration Even when this occurs, it is possible to prevent the ball 30 from being caught on the step 40 and separated.

In addition, as shown in FIG. 8 , at least one of the first curved part 11 and the second curved part 21 is curved so as to slightly attenuate the vertical vibration and the appropriate frictional force with the ball 30 . A rubber pad 41 may be laminated on the surface.

The ball 30 is interposed between the first curved portion 11 of the lower plate 10 and the second curved portion 21 of the upper plate 20 . The ball 30 is formed of a rigid material to withstand the load of the upper plate 20, and is preferably formed in a spherical shape. In addition, the surface may be smoothly formed to roll well between the first curved portion 11 and the second curved portion 21 or may be formed of a low friction material.

In terms of manufacturing, the first and second curved portions are formed by drilling directly on the surface of the upper and lower plates 10, or the curved portion and the plate portion are separately formed as shown in FIG. , it may be formed so that it can be combined.

In addition, as shown in FIG. 3A , the ball 30 is located at the center of the first curved portion 11 of the lower plate 10 or the second curved portion 21 of the upper plate 20 . It may be replaced with a ball caster 31 fixed to the . The ball caster 31 is a component that can be fixed at an arbitrary position while maintaining the rotational force of the ball 30, and is fixed to the center of the first curved portion 11 or the second curved portion 21 as described above. The role of the ball 30 may be performed as it is.

In the case of using the ball 30, the movable range of the upper plate 20 and the lower plate 10 is widened as shown in Fig. 3(b), and in the case of using the ball caster 31, the upper plate The movable range of (20) and the lower plate (10) is narrowed. Therefore, in a place where a lot of vibration occurs, it is possible to make it a top priority to use the ball 30 to attenuate the vibration, and in a place where there is little vibration, the vibration is attenuated, but the ball 30 so that the structure S does not shake too much. You can also use cast. The above-mentioned bar is only an example, and even in a place where a lot of vibration occurs, the ball 30 cast may be applied according to the characteristics of the structure S.

In addition, in the case of fixing the ball caster 31, the surface to which the ball caster 31 is fixed does not necessarily have to be a curved surface, so the surface to which the ball caster 31 is fixed is flat as shown in FIG. can also be formed as Since the ball 30 does not directly touch, it can be formed in a flat surface rather than a curved surface to facilitate coupling with the ball 30 cast.

In addition, as shown in FIG. 4 , the ball caster 31 may use a spring-type ball caster 31 as well as a general ball caster 31 . In the case of the spring-type ball (30) cast, it has a certain elasticity in the vertical direction, and it is possible to prevent the vibration in the vertical direction from being transmitted to the structure (S). The coupling part to be coupled is configured to be coupled with an elastic material such as a spring.

As described above, the rubber pad 41 may be laminated on the surface of at least one of the first curved portion 11 and the second curved portion 21 , and the ball caster 31 may be mounted on the first curved surface. When fixedly coupled to the portion 11 or the second curved portion 21 , the ball 30 does not directly contact the surface to which the ball caster 31 is fixed, so that the rubber pad 41 does not need to be coupled. Accordingly, the rubber pad 41 may be laminated on the surface of the first curved portion 11 or the second curved portion 21 to which the ball caster 31 is not fixed.

5 and 6 , a configuration for connecting the upper plate 20 and the lower plate 10 with a metal wire 53 may be further included. Looking in more detail, doedoe coupled to the lower surface of the lower plate 10, the first fixed plate 51 fixedly coupled to the metal wire 53, and coupled to the upper surface of the upper plate 20, the metal wire (53) and a second fixing plate 52 and one end is fixedly coupled to the first fixing plate 51, the other end is a metal wire 53 fixedly coupled to the second fixing plate 52 may include

When the upper plate 20 and the lower plate 10 are connected with the metal wire 53, after the seismic isolator operates, the restoration time can be shortened, and the vibration reduction effect can be increased. (This includes connecting the upper plate 20 and the lower plate 10 through the first fixing plate 51 and the second fixing plate 52.) In addition, the metal wire 53 operates as a seismic isolator. While the vibration energy is converted into thermal energy by friction while dissipating the vibration energy, the effect of reducing vibration can be increased.

The metal wire 53 may be formed in a twist shape in which a plurality of metal threads are twisted, and may be formed of a single metal wire 53 . However, as shown in FIGS. 5 and 6 , it is preferable to be formed in a twist shape having both flexibility and rigidity, since it must be bent and coupled to the upper and lower plates 10 .

In addition, since the metal wire 53 is to be coupled to the upper plate 20 and the lower plate 10 in a balanced manner, it is preferable that two or more are coupled radially from the center. For example, as shown in FIG. 5 , two pieces may be installed for each corner of the plate, and three pieces may be installed for each corner in the case of modular installation.

As another embodiment, as shown in FIGS. 5 and 6 , the first fixing plate 51 and the second fixing plate 52 are formed in a sector shape having an interior angle of 90 degrees, and each fixing plate has two A metal wire 53 is connected and fixed, and the first fixing plate 51 and the second fixing plate 52 form a set of four each, the upper surface of the upper plate 20 and the lower plate 10 It may be coupled to the lower surface.

The first fixing plate 51 and the second fixing plate 52 may be formed not only in a sector shape, but also in a rectangular shape, and may include any shape that can be coupled to each of the upper and lower plates 10 . Since the structure S is connected to the upper part of the upper plate 20 and the ground is connected to the lower part of the lower plate 10, the lower surface of the first fixed plate 51 and the upper surface of the second fixed plate 52 are should be formed flat. Therefore, when the metal wire 53 is connected and fixed to the first fixing plate 51 and the second fixing plate 52 , the metal wire 53 is exposed to the surfaces of the first and second fixing plates 52 . In order not to do so, a depression may be formed as much as the width of the metal wire 53 so that the metal wire 53 is buried in the depression and not exposed to the surface. Alternatively, a through hole capable of accommodating the metal wire 53 may be formed in the side portion of the first fixing plate 51 and the second fixing plate 52 to fix the metal wire 53 .

When the first and second fixing plates 52 are coupled to the upper and lower plates 10, they may be fixedly coupled using a metal adhesive, or may be fixedly coupled through screw coupling. In the case of screwing, the female screw parts are embedded in the surfaces of the upper and lower plates 10, and a through hole is formed at a position corresponding to the female screw part among the surfaces of the first and second fixing plates 52 to be coupled with screws. can

As another embodiment, as shown in FIG. 7 , the first magnetic material 61 and the upper plate are embedded and fixed in a surface not occupied by the first curved portion 11 among the upper surfaces of the lower plate 10 . It may further include a second magnetic body 62 buried and fixed so that the first magnetic body 61 and attractive force act on a surface that is not occupied by the second curved part 21 among the lower surfaces of 20 .

The ball 30 or the ball caster 31 should be freely moved on the curved portion, and it is most preferable that the magnetic materials contact each other in a plane. If the magnetic material is embedded and fixed so that the mutual attraction force acts, the vibration isolator does not operate in case of weak vibration, but can only operate in vibrations of a certain intensity or higher. In addition, after the seismic isolator operates, the restoration time can be shortened, the vibration reduction effect can be improved, and the initial position can be accurately restored.

The first and second magnetic bodies 62 may be embedded and fixed to each of the lower and upper plates 20 one by one, but it is preferable to install two or more in order to sufficiently secure magnetic force. The first and second magnetic bodies 62 may be embedded in each corner of the upper plate 20 to install four each.

As another embodiment, the above-described wire connection configuration and the first and second magnetic bodies 62 may be used together. In this case, if the external force by the metal wire 53 and the attractive force of the first and second magnetic bodies 62 act together, the seismic isolator may not operate properly. Therefore, the rigidity of the metal wire 53 and the first and second magnetic bodies By appropriately adjusting the magnetic force of (62), it can be operated at a desired vibration.

When the embodiment is described with reference to FIG. 9, as shown in FIGS. 9(a) and 9(b), one or more seismic isolators 100 are placed between a plate to be attached to the ground and a plate to be positioned under the structure S. ) may be implemented as a seismic isolating system.

10 to 12 show views of a seismic isolator according to still another embodiment of the present disclosure.

The seismic isolator disclosed herein includes a third magnetic body 63 installed between the lower plate 10 and the first curved portion 11, and a predetermined distance from the third magnetic body 63 to surround the periphery. It characterized in that it further comprises a curing agent 70 formed in the space between the support portion 80 and the third magnetic body 63 and the support portion 80 to be installed.

Unlike the first and second magnetic bodies 61 and 62 described above, the third magnetic body 63 having a cylindrical shape may be inserted into the space between the lower plate 10 and the first curved part 11, preferably in the central part. have. Here, the third magnetic body 63 can be stably supported without being separated while being fitted between the first curved portion 11 and the lower plate 10, which are recessed to have a predetermined curvature inside the upper surface, It may further include a support part 80 that is spaced apart from the three magnetic body 63 by a predetermined distance and is installed along the circumference. The support part 80 serves to support the curing agent 70 formed around the third magnetic body 63 so that it does not flow out. Next, the curing agent 70 is configured to fill the empty space between the third magnetic body 63 and the support part 80, and the space between the lower plate 10 and the first curved part 11 is rigidly reinforced, , is formed for the purpose of preventing the phenomenon of sagging by the upper load. The curing agent 70 may be, for example, an epoxy curing agent. The epoxy curing agent is a typical thermosetting resin, and may be prepared by polymerizing bisphenol A and epichlorohydrin. When the epoxy curing agent is used, volatiles are not generated during the curing process, and there is an advantage that it is easily adhered regardless of the bonding object such as wood or plastic as well as metal, and the volume change is not large. By using the epoxy curing agent, pouring into the space between the lower plate 10 and the first curved portion 11 to harden the empty space, it is possible to prevent sagging from the upper pressure.

In addition, the curing agent 70 may be formed between the upper plate 20 and the second curved portion 21 . For example, by installing the support portion 80 between the upper plate 20 and the second curved portion 21, and pouring a curing agent 70 into the inner space of the support portion 80 to harden the rigidity reinforcement effect. may be

According to a preferred feature of the present disclosure, a plurality of metal wires 53 are radially connected and fixed to the side portions of the lower plate 10 and the upper plate 20 .

The metal wire 53 is fixedly installed while interconnecting the upper plate 20 and the lower plate 10, and forms a through hole capable of accommodating the metal wire 53 to fix the metal wire 53. may be Since the metal wire 53 is installed, there is an effect of shortening the restoration time after the vibration isolator operates, and the vibration reduction effect can be increased. In addition, two metal wires 53 may be installed at each corner of the seismic isolator 100 , or three metal wires 53 may be installed at each corner when the vibration isolator 100 is installed in a modular form.

With respect to the seismic isolator according to the various embodiments described above, by adding a damping function, it is possible to reduce the recovery time after the operation of the seismic isolating system and to increase the vibration reduction effect. Various experimental data for this are shown below.

According to an embodiment of the seismic isolator to which the damping function is added, first, the first curved portion 11 and the second curved portion 21 of the lower plate 10 and the upper plate 20 are processed by a press. This is because, in the case of conventional seismic isolator products, the weight of the curved part increases while the surface is processed, and the basic design parameters of the seismic isolator are the radius of curvature and the friction coefficient of the material. The coefficient of friction can be reduced by coating. Next, the interior of the upper and lower plates 20 and 10 may be finished by filling epoxy to withstand a large load.

According to another embodiment of the seismic isolator to which the damping function is added, the response ratio and the damping ratio for the seismic isolator in which the metal wire 53 is added between the lower plate 10 and the upper plate 20 are shown in FIGS. It is shown in FIG. 16 .

13 to 15 , it can be seen that the metal wire 53 has a diameter of 6φ and shows the most effective response ratio when two metal wires 53 are installed and the vibration reduction effect is excellent. can When the number of the metal wires 53 is increased to three or more, the damping ratio increases, but the transmission rate tends to decrease by increasing the rigidity, and the metal wire 53 has a disadvantage that it is difficult to return to the center after operation due to the imbalance of rigidity. have.

16 shows comparative experimental data of response rate versus frequency according to the quantity of the metal wire 53 . Through this, it can be seen that the overall transmission rate is lower and the seismic isolation effect is generated without the influence of the excitation frequency, compared to the case where only the ball 30 is used.

17 to 20 show the comparison of the response ratio and the damping ratio for each case through the above experiment.

First, the excitation response ratio is the least transmitted when the metal wire 53 is installed, and the damping tends to be higher when the rubber pad 41 and the metal wire 53 are installed. In particular, referring to FIG. 20 , as a result of checking the stopping time of the seismic isolator for each case, it can be confirmed that when four metal wires 53 with a diameter of 6φ are used, the seismic isolator stops first after operation.

(When the diameter of the rubber pad 41 is 40φ-0.9s <

When 4 metal wires 53 with a diameter of 6φ are combined -3.7s <

When the diameters of the first and second magnetic bodies 61 and 62 are 50φ, -14s <

If the diameter of the ball (30) is 50 φ, 50 s)

From the comparison data, it can be seen that the smaller the diameter of the ball 30 is, the longer the curvature contact length is, the longer the vibration energy is converted into frictional heat energy, the smaller the excitation response ratio due to the increase in frictional energy. In addition, the damping ratio increases by installing the metal wire 53, but it can be seen that the optimal number of installations (according to the data, 4 metal wires 53 with a diameter of 6φ are required) due to the effect of the increase in rigidity, When a magnet is used, the distance between the upper plate 20 and the lower plate 10 is affected by the diameter of the ball 30 and acts as an important factor. Through this, it can be confirmed that the restoration time is shortened in the resonance frequency band by adding a damping function to the vibration isolator, and the vibration reduction effect is excellent.

The disclosed content is merely an example, and can be variously changed and implemented by those of ordinary skill in the art without departing from the gist of the claims claimed in the claims, so the protection scope of the disclosed content is limited to the specific It is not limited to an embodiment.

10: lower plate
11: first curved part
20: upper plate
21: second curved part
30: ball
31: ball caster
40: step
41: rubber pad
51: first fixed plate
52: second fixing plate
53: metal wire
61: first magnetic body
62: second magnetic material
63: third magnetic material
70: hardener
80: support
100: seismic isolator
S: structure

Claims (6)

In the vibration isolator for damping vibration,
a lower plate including a first curved portion recessed to have a predetermined curvature inside the upper surface;
an upper plate including a second curved portion recessed into the lower surface to have a predetermined curvature; and
and a ball interposed between the first curved portion of the lower plate and the second curved portion of the upper plate,
The perimeter of the first curved portion and the second curved portion is formed in a circular shape, and the first curved portion and the second curved portion itself are recessed inward of each plate, so that the first curved portion and the second curved portion are formed on the outer periphery of the first curved portion and the second curved portion. A step is formed,
a first fixing plate coupled to the lower surface of the lower plate and fixedly coupled to the metal wire;
a second fixing plate coupled to the upper surface of the upper plate and fixedly coupled to the metal wire; and
One end is fixedly coupled to the first fixing plate, the other end is a metal wire fixedly coupled to the second fixing plate; further comprising,
The first fixing plate and the second fixing plate are formed in a sectoral shape having an interior angle of 90 degrees, and the two metal wires are connected and fixed to each fixing plate,
The first fixing plate and the second fixing plate form a set of four and are coupled to the upper surface of the upper plate and the lower surface of the lower plate,
A first magnetic material embedded in and fixed to a surface not occupied by the first curved portion of the upper surface of the lower plate and the first magnetic material and attractive force acting on a surface not occupied by the second curved portion among the lower surfaces of the upper plate It further comprises a second magnetic material to be embedded and fixed,
A vibration isolator, characterized in that a rubber pad is laminated on any one of the first curved portion and the second curved portion.
delete delete delete The method according to claim 1,
a third magnetic body installed between the lower plate and the first curved part;
a support part spaced apart from the third magnetic body by a predetermined distance and installed to surround the circumference; and
and a curing agent formed in a space between the third magnetic body and the support part.
6. The method of claim 5,
A plurality of metal wires are radially connected and fixed to the side portions of the lower plate and the upper plate.

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