KR20210048799A - Isolation bearings for instrument - Google Patents

Abstract

Disclosed is an isolation bearing for a device, which is able to be placed between an upper structure and a floor of the device, support the upper structure, and prevent a decrease in the performance and collapse by a horizontal earthquake inertial force of a design criteria or above generated in the upper structure of the device. In accordance with an embodiment of the present invention, the isolation bearing comprises: a first flange whose upper side comes in contact with a lower side of the upper structure of the device; a second flange placed on a lower side of the first flange, whose lower side comes in contact with the floor; a first plate placed between the first flange and the second flange, whose upper side is engaged with a lower side of the first flange; a second plate placed between the first plate and the second flange, whose lower side is engaged with an upper side of the second plate, and the widths of an upper side and a lower side are greater than the widths of an upper side and a lower side of the first plate; a rubber piled up in a space between the first plate and the second plate, whose center unit is penetrated; a steel piled up in the gap space of the rubber, whose center unit at the same position as the position of the center unit of the rubber is penetrated, and which forms an empty space along with the rubber; a metal wire inserted into the empty space of the rubber and the steel, whose one end is engaged with an upper side of the second plate, and which has an additional length by being extended to be longer than the vertical heights of the rubber and the steel piled up to attenuate the horizontal seismic momentum force of the design criteria or greater of the upper structure; and an excessive displacement control unit which winds or unwinds the other end of the metal wire facing one end of the metal wire and controls the additional length of the metal wire.

Description

Isolation bearings for instrument}

The present invention relates to a seismic isolation bearing for a device, and more particularly, it is provided between the upper structure and the floor of the device to support the upper structure, and it prevents performance degradation and collapse due to horizontal seismic inertial force above the design standard generated in the upper structure of the device. It relates to a seismic isolation bearing for equipment that can be prevented.

Awareness about the seismic safety of existing and new nuclear power plants was heightened as earthquakes of fearful levels occurred in Gyeongju in September 2016 and in Pohang in November 2017.

Currently, the domestic standard APR 1400 (advanced power reactor 1400) is designed to be seismic-resistant to 0.3 g, and it has been reported that the seismic performance satisfies 0.5 g. Since various structures and devices are embedded in the APR 1400, if the seismic performance is increased to 0.6 g or more, the range of facilities vulnerable to seismic resistance is partially increased. As a solution to this, various measures such as seismic reinforcement, consideration of elasto-plastic analysis, and application of seismic isolation for individual devices have been proposed.

Here, the application of seismic isolation for individual devices is to minimize the transmission of high-frequency vibrations from the ground even though the response displacement is large in case of earthquake by introducing a seismic isolating device with high flexibility between the upper structure of the device and the floor. It is to reduce the seismic load generated by structures, systems and individual equipment.

On the other hand, the seismic isolation bearing device must support the load of the structure in the vertical direction, and it is structurally required to absorb and attenuate the vibration energy by having sufficient deformation capacity and energy dissipation capacity when vibration occurs in the vertical or horizontal direction.

These conventional seismic isolation bearing devices are widely used in structures such as bridges, buildings, and civil structures around the world, and in recent years, the frequency of use thereof is increasing in Korea.

However, conventional seismic isolation bearing devices are limited to large structures with a large weight such as bridges, buildings, civil structures, etc., and are not applied to small structures with a small weight such as devices (eg, 1 to 10 tons in weight). This is because it is difficult to design and manufacture a seismic-isolating bearing device having adequate rigidity for small structures with small weight, and if the design formula for applying the same design formula for large structures is applied the same, some errors occur, so it cannot be applied immediately. Because.

In addition, the conventional seismic isolation bearing device is provided with a laminated rubber body in which laminated rubber parts having the same upper and lower widths are laminated to absorb and attenuate vibration energy. Due to the effect, there is a problem that buckling occurs at both ends of the seismic isolation bearing device, a part of the rubber laminate is plastically deformed, and performance is deteriorated.

Accordingly, there is a need to develop a device that can be applied to a device that is a small structure, but prevents deterioration and collapse due to excessive horizontal inertia force and improves safety reliability when an earthquake occurs in the upper structure of the device above the design standard.

Korean Patent Registration No. 10-1725312

Journal of the Korean Society of Pressure Equipment Engineers Vol. 14, No. 2, December 2018 "Review of the feasibility of improving the seismic performance of nuclear power plants based on equipment seismic isolation"

The present invention has been proposed to solve the above problems, and by forming the lower width wider than the upper width of the bearing unit in which rubber and steel are laminated, the horizontal seismic inertia generated in the upper structure of the small structure is greater than the design standard. The purpose is to provide a seismic isolation bearing for equipment that can prevent performance degradation and collapse due to this.

In particular, an object of the present invention is to provide a seismic isolation bearing for a device that can prevent performance degradation and collapse due to horizontal seismic inertia that is greater than the design standard, which is generated in the upper structure of a nuclear power plant, among devices that are small structures.

In addition, the present invention is a device capable of controlling the occurrence of a horizontal displacement above the design standard of the upper structure of the device through the tensile force of a metal wire whose length is adjusted to have an extra length when a horizontal displacement greater than the design standard occurs in the upper structure of the device. The purpose is to provide seismic isolation bearings for use.

On the other hand, the technical problem to be achieved in the present invention is not limited to the technical problems mentioned above, and other technical problems that are not mentioned are clearly to those of ordinary skill in the technical field to which the present invention belongs from the following description. It will be understandable.

As a technical means for achieving the above object, a seismic isolation bearing for a device according to an embodiment of the present invention includes: a first flange having an upper portion in contact with a lower portion of an upper structure of the device; A second flange provided in a downward direction of the first flange and having a lower portion in contact with the floor; A first plate provided between the first flange and the second flange, the upper part being coupled to the lower part of the first flange; A second plate provided between the first plate and the second flange, the lower portion being coupled to the upper portion of the second plate, and having upper and lower widths wider than that of the upper and lower portions of the first plate; A rubber laminated in the space between the first plate and the second plate and passing through the center portion; Steel laminated in the space between the rubbers, and the center of the rubber penetrates through the center at the same position as the center of the rubber to form an empty space with the rubber; It is inserted into the empty space of rubber and steel, and one end is combined with the upper part of the second plate, and is formed to extend longer than the vertical height of the laminated rubber and steel in order to attenuate the horizontal seismic inertial force above the design standard of the upper structure. A metal wire having a; And a transient displacement adjusting unit for adjusting the margin length of the metal wire by winding or unwinding the other end of the metal wire opposite one end of the metal wire.

In addition, the second plate is formed to have a width of 1.2 to 2 times as wide as the width of the upper part of the first plate.

In addition, the transient displacement control unit adjusts the extra length of the metal wire through winding or unwinding so that tensile force is generated in the metal wire when the horizontal displacement of the upper structure is 200 to 250% or more.

In addition, the transient displacement control unit adjusts the extra length of the metal wire according to the reference horizontal displacement according to the installation position of the seismic isolation bearing for the device before installing the seismic isolation bearing for the device on the device, and then fixes the metal wire so that it is not wound or unwound.

In addition, the weight of the device is 1-10 tons.

According to an embodiment of the present invention, the seismic isolation bearing for a device can be applied to a device that is a small structure having a small weight, so that the seismic performance of the device can be improved through the base isolation of the device.

In addition, according to an embodiment of the present invention, since the seismic performance of the device can be improved, it can be applied to a device in which the seismic performance improvement is essential, such as a nuclear power plant.

In addition, according to an embodiment of the present invention, by forming the width of the lower portion of the bearing unit to be wider than the width of the upper portion, it is possible to prevent performance degradation and collapse due to a horizontal displacement above the design standard that occurs in the upper structure of the device.

In addition, according to an embodiment of the present invention, the length of the metal wire is adjusted to have an extra length by the transient displacement control unit, so that the occurrence of horizontal displacement beyond the design standard of the upper structure of the device can be prevented through the tensile force of the metal wire. .

On the other hand, the effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those of ordinary skill in the art from the following description. I will be able to.

1 is a perspective view of a seismic isolation bearing for a device according to an embodiment of the present invention.
2 is a side view of a seismic isolation bearing for a device according to an embodiment of the present invention.
3 is an inner cross-sectional view of a seismic isolation bearing for a device according to an embodiment of the present invention from A to A'of FIG. 1.
4 is a block diagram showing a transient displacement adjusting unit configured in a seismic isolation bearing for a device according to an embodiment of the present invention.
5 is a diagram showing a state of use in a state in which a horizontal displacement occurs in an upper structure.
6 is a side view showing seismic isolation bearings modeled for comparison of vertical and horizontal stiffness.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the present invention. However, since the description of the present invention is merely an embodiment for structural or functional description, the scope of the present invention should not be construed as being limited by the embodiments described in the text. That is, since the embodiments can be variously changed and have various forms, the scope of the present invention should be understood to include equivalents capable of realizing the technical idea. In addition, since the object or effect presented in the present invention does not mean that a specific embodiment should include all or only such effects, the scope of the present invention should not be understood as being limited thereto.

The meaning of the terms described in the present invention should be understood as follows.

Terms such as "first" and "second" are used to distinguish one component from other components, and the scope of rights is not limited by these terms. For example, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component. When a component is referred to as being "connected" to another component, it should be understood that although it may be directly connected to the other component, another component may exist in the middle. On the other hand, when a component is referred to as being "directly connected" to another component, it should be understood that there is no other component in the middle. On the other hand, other expressions describing the relationship between components, that is, "between" and "just between" or "neighboring to" and "directly neighboring to" should be interpreted as well.

Singular expressions are to be understood as including plural expressions unless the context clearly indicates otherwise, and terms such as "comprises" or "have" refer to the specified features, numbers, steps, actions, components, parts, or these. It is to be understood that it is intended to designate that a combination exists and does not preclude the presence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the field to which the present invention belongs, unless otherwise defined. Terms defined in commonly used dictionaries should be interpreted as having meanings in the context of related technologies, and cannot be interpreted as having an ideal or excessively formal meaning unless explicitly defined in the present invention.

<Configuration>

Hereinafter, a configuration of a seismic isolation bearing 1 for a device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view of a seismic isolation bearing for a device according to an embodiment of the present invention, FIG. 2 is a side view of a seismic isolation bearing for a device according to an embodiment of the present invention, and FIG. It is an inner cross-sectional view of a seismic isolation bearing for a device according to an embodiment of the present invention, and FIG. 4 is a block diagram showing a transient displacement control unit configured in the seismic isolation bearing for a device according to an embodiment of the present invention, and FIG. This is a diagram of the usage condition in the state in which the horizontal displacement occurred.

As shown in these accompanying drawings, the seismic isolation bearing 1 for a device according to an embodiment of the present invention includes a first flange 10, a second flange 20, a bearing unit 30, and a transient displacement control unit. 40 is provided.

The first flange 10 is not shown in the drawing, but based on the attenuation performance of the bearing unit 30, in order to suppress the upper structure of the device from flowing in the middle and horizontal directions as much as possible, the upper part is the lower part of the upper structure. It is in contact and supports the load of the upper structure through contact with the upper structure.

The second flange 20 is not shown in the drawing, but based on the attenuation performance of the bearing unit 30, in order to suppress the upper structure from flowing in the vertical and horizontal directions as much as possible, the lower part is in contact with the floor, and the lower part is in contact with the floor. The seismic isolation bearing (1) for the device is positioned between the upper structure and the floor through the contact.

The bearing unit 30 is provided between the first flange 10 and the second flange 20, as shown in FIGS. 2 to 3, and is provided with a first plate 31, a second plate 32, and a rubber ( 33), steel 34, empty space 35 and metal wire 36 are provided.

The first plate 31 is located between the first flange 10 and the second flange 20, so that the bearing unit 30 is provided between the first flange 10 and the second flange 20. In order to be combined with the lower portion of the first flange (10).

The first plate 31 has an upper width and a lower width differently, and preferably, the lower width is wider than the upper width. Accordingly, the cross-sectional shape of the side of the first plate 31 may be formed in a trapezoidal shape.

The second plate 32 is located between the first flange 10 and the second flange 20, so that the bearing unit 30 is provided between the first flange 10 and the second flange 20. In order to be combined with the upper portion of the second flange (10).

The second plate 32 is formed to have different upper and lower widths, and preferably, the upper and lower widths are wider than the upper and lower widths of the first plate 31, and more preferably The width of the lower part is formed wider than the width of the upper part.

For example, the second plate 32 may have a lower width 1.2 to 2 times wider than the upper width of the first plate 31. Accordingly, the side cross-sectional shape of the second plate 32 may be formed in a trapezoidal shape larger than the side cross-sectional shape of the first plate 31.

The rubber 33 is provided in plural between the first plate 31 and the second plate 32, and is laminated in each space between the laminated steel 34, and one of the plurality of rubbers 33 33 is coupled with the lower portion of the first plate 31 and the other rubber 33 is coupled with the upper portion of the second plate 32.

In addition, the rubber 33 is formed in a wider width from the top to the bottom. Accordingly, the side cross-sectional shape of the laminated rubber 33 may be formed in a trapezoidal shape with a wide lower width.

The rubber 33 is provided to attenuate vertical and horizontal displacements above the design standard of the upper structure based on frictional resistance.

Furthermore, the rubber 33 penetrates the central portion, and is stacked as the central portion penetrates to form an empty space 35.

The steel 34 is provided between the first plate 31 and the second plate 32 in plural, and is laminated in each space between the laminated rubbers 33.

And the steel 34 is formed in a wider width from the top to the bottom. Accordingly, the side cross-sectional shape of the stacked steel 34 may be formed in a trapezoidal shape with a wide lower width.

The steel 34 is provided to minimize the shape deformation of the rubber 33 due to vertical displacement and horizontal displacement above the design standard of the upper structure while maintaining the outer shape of the bearing unit 30.

Further, the steel 34 penetrates through the center and is stacked to form an empty space 35 as the center penetrates through the steel 34.

On the other hand, the bearing unit 30 is wider from the top to the bottom through the first plate 31, the second plate 32, the rubber 33, and the steel 34, so that the side cross-sectional shape is lowered. The width of is formed in a trapezoidal shape that is wider than the width of the upper part.

Such a bearing unit 30 is a conventional seismic isolation having the same width at the top and bottom where performance degradation occurs due to plastic deformation of a part due to buckling at both ends when a horizontal seismic inertia force greater than the design standard generated in the upper structure is generated due to the trapezoidal shape. Unlike the bearing device, it has the advantage of preventing performance degradation and collapse due to horizontal seismic inertia over design standards generated in the upper structure.

The empty space 35 is formed in the center of the rubber 33 and the steel 34, and the upper and lower portions are opened respectively. Through this, one end of the metal wire 36 may be coupled to the upper portion of the second plate 32 and the other end may be wound around the transient displacement control unit 40.

The metal wire 36 is inserted into the empty space 35, one end is coupled to the upper portion of the second plate 32, and the other end is wound around the transient displacement control unit 40. The metal wire 36 is formed to extend longer than the height of the empty space 35 in the vertical direction, and is wound or unwound by the transient displacement control unit 40 to have an extra length.

Here, the reason why the metal wire 36 has an extra length is to attenuate the horizontal displacement above the design standard of the upper structure through tensile force when a horizontal displacement greater than the design standard of the upper structure occurs.

Specifically, the metal wire 36, as shown in Fig. 5, when the horizontal displacement of the upper structure is generated by 200 to 250% or more so that the width W of the first flange 10 flows, a tensile force is generated. It can attenuate the horizontal displacement of the upper structure.

Meanwhile, in FIG. 5, it is shown that the metal wire 36 is not completely taut, but when the horizontal displacement of the upper structure is 200 to 250% or more, a tensile force may be generated and thus the metal wire 36 may be completely taut.

The transient displacement adjusting unit 40 is not shown in the drawing, but is provided on the top of the first plate 10 or on the bearing unit 30 to wind up or unwind the other end of the metal wire 36.

When the horizontal displacement of the upper structure is 200-250% or more, the transient displacement control unit 40 adjusts the extra length of the metal wire 36 through winding or unwinding so that a tensile force is generated in the metal wire 36. .

And the transient displacement control unit 40 adjusts the clearance length of the metal wire 36 according to the reference horizontal displacement of the upper structure according to the installation location before installing the seismic isolation bearing 1 for the device on the device, and then the metal wire ( 36) is fixed so that it is not wound or unwound.

In addition, the transient displacement control unit 40 is not shown in the drawing, but receives the reference horizontal displacement of the upper structure according to the installation location from an external terminal or computer so that the metal wire 36 has a margin according to the reference horizontal displacement. A control unit (not shown) for winding or unwinding the metal wire 36 by remote operation may be provided. However, the transient displacement control unit 40 may be capable of winding or unwinding the metal wire 36 not only by remote operation but also by direct operation by a user.

As described above, the seismic isolation bearing 1 for a device of the present invention is applied to a device that is a small structure to improve the seismic performance of the device, and in particular, has an advantage applicable to a device such as a nuclear power plant in which the seismic performance improvement is essential.

<Vertical stiffness and horizontal stiffness comparative experiment>

Hereinafter, the process of comparing vertical stiffness and horizontal stiffness and results of the comparative experiment using the seismic isolation bearings modeled with reference to FIG. 6 will be described in detail.

First, the seismic isolation bearing shown in FIG. 6A is a basic seismic isolation bearing provided with a cylindrical bearing unit having the same upper width (W) and lower width (W') of the bearing unit. Unlike the seismic isolation bearing (1) for equipment of the present invention, this basic type of seismic isolating bearing for equipment is partially plastically deformed by buckling at both ends when a horizontal seismic inertia force exceeding the design standard generated in the upper structure is generated, and performance may be degraded. have.

And the seismic isolation bearing shown in FIG. 6(b) has an upper width (W) of 10 mm reduced compared to the basic seismic isolation bearing shown in FIG. 6(a), and a lower width (W') of FIG. It is a seismic isolation bearing (1) for equipment whose lower width is larger than the upper width, which is adjusted to have the same volume as the basic seismic isolation bearing shown in (a). Unlike the basic seismic isolation bearings, the seismic isolation bearings 1 for devices can prevent performance degradation and collapse due to horizontal seismic inertia forces greater than the design standard generated in the upper structure.

In addition, the seismic isolation bearing shown in FIG. 6(c) has an upper width (W) of 10 mm reduced compared to the seismic isolation bearing 1 for a device shown in FIG. 6(b) and a lower width (W' ) Is the width of the lower part compared to the seismic isolation bearing 1 for equipment shown in FIG. 6(b), which is adjusted to have the same volume as the seismic isolation bearing 1 for a small structure shown in FIG. 6(b). It is a deformed seismic isolation bearing (1) for equipment that is wider than the width.

The vertical and horizontal stiffness (shear stiffness values were derived from the basic seismic isolation bearings, equipment seismic isolation bearings (1), and modified equipment seismic isolation bearings (1) using the ANSYS program in [Table 1] Is the same as

Model \ value Vertical stiffness
(N/mm) Horizontal stiffness
(N/mm) Basic type 5,784 43.1 Variant 1 5,240 43.2 Variant 2 4,958 41.6

In the above [Table 1], the basic model refers to a base seismic isolation bearing, the variant 1 model refers to a seismic isolation bearing (1) for a device, and the variant 2 model refers to a modified seismic isolation bearing (1). [Table 1] above. In the vertical stiffness and the horizontal stiffness slightly decrease as the width of the lower part of the bearing unit 30 is wider than the width of the upper part, it was confirmed that there is no significant difference in vertical stiffness and horizontal stiffness.

And the result of calculating and comparing the overturning moment when shear deformation occurs under a design load of 1000 kgf applied to the top of the basic seismic isolation bearing, the seismic isolation bearing for equipment (1), and the deformed seismic isolation bearing for equipment (1). It is as shown in [Table 2].

division Overturning moment (N·m) Reduction rate of overturning moment (%) Basic type 103 - Variant 1 54 48 Variant 2 13 87

Here, 100% of the shear deformation was set as the total height (24 mm) of the bearing unit 30, and [Table 2] shows the overturning moment in the state where the shear deformation of 200%, that is, 48 mm of shear deformation occurs. In the above [Table 2], the value of the overturning moment decreases toward the basic seismic isolating bearing, the seismic isolating bearing for equipment (1), and the seismic isolating bearing for deformed equipment (1). Confirmed to increase.

Through this, it was confirmed that as the side cross-sectional shape of the bearing unit 30 was changed, the value of the overturning moment was decreased for the same shear deformation.

Therefore, according to the above [Table 1] and [Table 2], the seismic isolation bearing 1 for equipment of the present invention has no significant difference in vertical and horizontal stiffness compared to the basic seismic isolation bearing, but the overturning moment for the same shear deformation. By reducing the value, it was confirmed that when the horizontal seismic inertia force generated in the upper structure exceeds the design standard, a part of it is plastically deformed by buckling at both ends, resulting in deterioration of performance and prevention of collapse.

Detailed description of the preferred embodiments of the present invention disclosed as described above has been provided to enable those skilled in the art to implement and practice the present invention. Although the above has been described with reference to preferred embodiments of the present invention, those skilled in the art will understand that various modifications and changes can be made to the present invention without departing from the scope of the present invention. For example, those skilled in the art may use the configurations described in the above-described embodiments in a manner that combines them with each other. Accordingly, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

The present invention may be embodied in other specific forms without departing from the spirit and essential features of the present invention. Therefore, the detailed description above should not be construed as restrictive in all respects and should be considered as illustrative. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included in the scope of the present invention. The invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. In addition, the embodiments may be configured by combining claims that do not have an explicit citation relationship in the claims, or may be included as new claims by amendment after filing.

1: seismic isolation bearings for equipment,
10: first flange,
20: second flange,
30: bearing unit,
31: first plate,
32: second plate,
33: rubber,
34: steel,
35: empty space,
36: metal wire,
40: transient displacement control unit.

Claims (5)

In the seismic isolation bearing for equipment to improve the seismic resistance of the equipment,
A first flange whose upper part is in contact with the lower part of the upper structure of the device;
A second flange provided in a downward direction of the first flange and having a lower portion in contact with the floor;
A first plate provided between the first flange and the second flange, and having an upper portion coupled to the lower portion of the first flange;
A second plate provided between the first plate and the second flange, the lower portion being coupled to the upper portion of the second plate, and having upper and lower widths wider than the upper and lower widths of the first plate ;
A rubber laminated in the space between the first plate and the second plate and passing through a center portion;
A steel stacked in the space between the rubbers and passing through a center at the same position as the center of the rubber to form an empty space with the rubber;
Inserted into the empty space of the rubber and the steel, one end is coupled to the upper portion of the second plate, and is longer than the vertical height of the laminated rubber and steel in order to attenuate the horizontal seismic inertia force above the design standard of the upper structure A metal wire extending and having an extra length; And
A seismic isolation bearing for a device, comprising: a transient displacement adjusting unit for adjusting the clearance length of the metal wire by winding or unwinding the other end of the metal wire opposite one end of the metal wire. The method of claim 1,
The second plate,
A seismic isolation bearing for a device, characterized in that the width of the lower part is formed to be 1.2 to 2 times wider than the width of the upper part of the first plate. The method of claim 1,
The transient displacement control unit,
A seismic isolation bearing for a device, characterized in that when the horizontal displacement of the upper structure is 200 to 250% or more, the free length of the metal wire is adjusted through winding or unwinding so that a tensile force is generated in the metal wire. The method of claim 3,
The transient displacement control unit,
Before installing the seismic isolation bearing for the device to the device, adjusting the clearance length of the metal wire according to the reference horizontal displacement according to the installation position of the seismic isolation bearing for the device, and then fixing the metal wire so that it is not wound or unwound. A seismic isolation bearing for equipment characterized by. The method of claim 1,
A seismic isolation bearing for a device, characterized in that the weight of the device is 1 to 10 tons.

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