JP7480245B2 - Vibration isolation device and method for replacing the vibration isolation device - Google Patents

Description

The present invention relates to a vibration isolation device and a method for replacing the vibration isolation device.

In order to reduce damage caused by earthquakes, earthquake-resistant devices are sometimes placed between buildings and above-ground structures.
Patent Document 1 discloses a structure in which a laminated rubber bearing is disposed below a spherical sliding bearing.
Patent Document 2 discloses a structure that prevents a planar sliding bearing from shifting due to a typhoon by manually attaching a connecting means to the planar sliding bearing.
Patent Document 3 discloses a structure that prevents a vibration isolation device from being activated by a typhoon by providing a wind-resistant device in addition to the vibration isolation device.

Japanese Patent Application Laid-Open No. 11-324397 JP 2003-41801 A Patent No. 6228337

There is a challenge to prevent the vibration isolation device from being activated by small horizontal forces such as those caused by typhoons. There is also a challenge to reduce the space required for the vibration isolation device at the installation site.

The present invention was made in consideration of the above-mentioned circumstances, and aims to provide a vibration isolation device and a method for replacing the vibration isolation device that will not be activated by small horizontal forces such as those caused by typhoons, and that requires a small installation space.

<1> The vibration isolation device according to aspect 1 of the present invention is a vibration isolation device comprising an upper shoe, a lower shoe, and a slider that slides between the upper shoe and the lower shoe, and is characterized by comprising a connecting means that can connect the upper shoe and the lower shoe.

According to this invention, a connecting means is provided that can connect the upper shoe and the lower shoe. By connecting the upper shoe and the lower shoe with the connecting means, it is possible to prevent the vibration isolation device from being activated by small horizontal forces applied by typhoons, etc. In addition, the connecting means is one of the components of the vibration isolation device. Therefore, for example, the installation space can be reduced compared to a case where a wind-resistant device is provided separately from the vibration isolation device.

<2> The vibration isolation device according to aspect 2 of the present invention is the vibration isolation device according to aspect 1, characterized in that the connecting means is provided at a corner of the upper shoe or the lower shoe.

According to this invention, the connecting means is provided at the corners of the upper or lower shoe. This makes it easier to visually check the state of the connecting means from the outside. This improves the ease of managing the vibration isolation device. Also, for example, by providing the connecting means symmetrically at multiple locations at the corners of the upper or lower shoe, it is possible to achieve optimal load balance.

<3> The vibration isolation device according to aspect 3 of the present invention is the vibration isolation device according to aspect 1 or 2, characterized in that the lower shoe is provided on the upper part of the lower structure, and the connecting means does not overlap with the upper part when viewed in the vertical direction.

According to this invention, the lower shoe is provided on the upper part of the lower structure. In other words, the lower shoe is provided at a higher position than the rest of the upper part of the lower structure. The connecting means does not overlap with the upper part when viewed along the vertical direction. In other words, the connecting means is located on the outside of the upper part. This allows the connecting means to be visually inspected by looking down from below. This makes it easier to check the condition of the connecting means. For example, when the connecting means becomes detached from the upper shoe and the lower shoe and replacement of the connecting means becomes necessary, the worker can perform the replacement while standing. This further improves the ease of management of the seismic isolation device.

<4> The vibration isolation device according to aspect 4 of the present invention is the vibration isolation device according to aspect 3, characterized in that the connecting means can release the connection between the upper shoe and the lower shoe by moving toward the lower structure when the horizontal force on the vibration isolation device is greater than a predetermined value.

According to this invention, when the horizontal force on the vibration isolation device is greater than a predetermined value, the connecting means can move toward the lower structure to release the connection between the upper shoe and the lower shoe. By setting the predetermined value to the magnitude of the horizontal force applied by a level 1 earthquake motion, for example, the vibration isolation device can be activated only for horizontal forces equivalent to earthquakes of level 1 or higher. Since the connecting means can move toward the lower structure to release the connection between the upper shoe and the lower shoe, it is easy to visually check whether the connection by the connecting means has been released. This can further improve the ease of management of the vibration isolation device.

<5> The vibration isolation device according to aspect 5 of the present invention is the vibration isolation device according to aspect 4, further comprising a storage means provided under the lower shoe, and the storage means is capable of storing the connecting means that has moved toward the lower structure.

According to this invention, the storage means can store the connecting means that has moved toward the lower structure. This allows the worker to visually check the storage means to see whether the connection by the connecting means has been released. This further improves the ease of managing the seismic isolation device.

<6> The vibration isolation device according to aspect 6 of the present invention is the vibration isolation device according to aspect 5, characterized in that the connecting means includes abutment means, and the abutment means abuts against the upper shoe when the horizontal force is not greater than the predetermined value, and does not abut against the upper shoe when the horizontal force is greater than the predetermined value.

According to this invention, the abutment means included in the connecting means abuts against the upper shoe when the horizontal force is not greater than a predetermined value, and does not abut against the upper shoe when the horizontal force is greater than the predetermined value. In this way, by making the connecting means a simple structure, the connecting means can be made low cost. The connecting means can be easily replaced. By relying on a physical action to release the connection when the horizontal force exceeds the predetermined value, variation in the predetermined value can be reduced.

<7> The vibration isolation device according to aspect 7 of the present invention is the vibration isolation device according to aspect 6, characterized in that the contact surface of the contact means that contacts the upper shoe is a spherical surface.

According to this invention, the contact surface of the contact means that contacts the upper shoe is a spherical surface. This makes it possible to prevent horizontal forces from causing the connecting means to bite into the upper shoe, compared to when the contact surface is made up of the sides of a rectangular column, for example. This makes it easier to release the connection by the connecting means.

<8> The vibration isolation device according to aspect 8 of the present invention is the vibration isolation device according to aspect 6 or 7, characterized in that the connecting means is a plastic deformation means that plastically deforms when the horizontal force is greater than the predetermined value, and includes a plastic deformation means provided below the abutment means, and when the horizontal force is greater than the predetermined value, the abutment means plastically deforms the plastic deformation means so that it no longer abuts against the upper shoe and moves toward the lower structure.

According to this invention, when the horizontal force is greater than a predetermined value, the abutment means plastically deforms the plastic deformation means, so that the abutment means no longer abuts the upper shoe and moves toward the lower structure. In other words, the predetermined value is the elastic limit of the plastic deformation means. In this way, by determining the predetermined value based on the physical properties of the plastic deformation means, it is possible to reduce variation in the predetermined value.

<9> The method for replacing a vibration isolation device according to aspect 9 of the present invention is a method for replacing a vibration isolation device according to any one of aspects 5 to 8, characterized in that it comprises a removal step of removing the connecting means stored in the storage means together with the storage means, and an attachment step of attaching new connecting means from the underside of the lower shoe after the removal step.

According to this invention, the method includes a removal step in which the connecting means stored in the storage means is removed together with the storage means, and an installation step in which new connecting means is installed from the underside of the lower shoe after the removal step. This makes it easy to replace the connecting means, thereby improving the maintainability of the vibration isolation device.

The present invention provides a vibration isolation device and a method for replacing the vibration isolation device that does not operate due to small horizontal forces such as those caused by typhoons and requires a small installation space.

FIG. 2 is a front view of the vibration isolation device according to the present invention. FIG. 2 is a diagram showing a state in which the vibration isolation device shown in FIG. 1 is activated. FIG. 2 is a plan view of a vibration isolation device equipped with a first connecting means. FIG. 2 is a plan view of a vibration isolation device equipped with a second connecting means. FIG. 6 is a diagram showing a state in which a fuse metal member is plastically deformed in the first connecting means shown in FIG. 5 . 1 is a plan view of a vibration isolation device having a first connecting means in an activated state. FIG. 1 is a front view of a vibration isolation device equipped with a second connecting means. FIG. FIG. FIG. FIG. 2 is a three-view diagram of a fuse plate. 11 is a diagram showing a state in which the fuse plate is plastically deformed in the second connecting means shown in FIG. 10 . 13 is a front view of a vibration isolation device equipped with a second connecting means in an activated state. FIG. FIG. 15 is a diagram showing a state in which the fuse spring is deformed in the third connecting means shown in FIG. 14 .

Hereinafter, a vibration isolation device 100 according to an embodiment of the present invention will be described with reference to the drawings. As shown in Fig. 1, the vibration isolation device 100 is installed between an upper structure U and a lower structure L.
The upper structure U is, for example, a structure such as a building or a bridge. The lower structure L is, for example, a foundation structure for the upper structure U. The lower structure L is, for example, a foundation structure installed between the ground and the upper structure U. In this way, the upper structure U is supported on the ground.
When a horizontal force is generated due to, for example, an earthquake or the like, the vibration isolation device 100 relatively displaces the upper structure U and the lower structure L in the horizontal direction as shown in Fig. 2. In this way, the vibration isolation device 100 makes it difficult for the vibration of the lower structure L to be transmitted to the upper structure U.

(Regarding the vibration isolation device 100)
As shown in FIG. 1 , the vibration isolation device 100 includes an upper shoe 10 , a lower shoe 20 , a slider 30 , a connecting means 40 , and a storing means 50 .
The upper shoe 10 is disposed on the lower part of the upper structure U. In this embodiment, a recess 10d is provided on the lower surface of the upper shoe 10 at a portion where the connecting means 40 is disposed (details will be described later).

The lower shoe 20 is disposed on the lower structure L. In this embodiment, the lower shoe 20 is provided on an upper portion Lt of the lower structure L. The upper portion Lt is, for example, cylindrical. The upper portion Lt may be, for example, rectangular prism-shaped. A through hole 20h is provided in the lower shoe 20 at a portion where the connecting means 40 is disposed (details will be described later).
The upper shoe 10 and the upper structure U, and the lower shoe 20 and the lower structure L are fixed to each other by, for example, bolts (not shown). The upper shoe 10 and the upper structure U, and the lower shoe 20 and the lower structure L may be fixed to each other by welding.

Both the upper shoe 10 and the lower shoe 20 are rectangular (rectangular or square) plate materials in plan view, and are made of rolled steel for welding steel (SM490A, B, C, or SN490B, C, or S45C). The lower surface of the upper shoe 10 and the upper surface of the lower shoe 20 are provided with sliding surfaces 10a, 20a having a curvature, respectively, to which stainless steel sliding plates (not shown) are fixed. In addition, the upper shoe 10 and the lower shoe 20 have stopper rings S, which are annular in plan view, fixed to the outer periphery of the sliding plates to prevent the slider 30 from falling off.

The slider 30 slides between the upper shoe 10 and the lower shoe 20. This allows the upper shoe 10 and the lower shoe 20 to move relative to each other in the horizontal direction. The slider 30 has upper and lower sliding surfaces 30a with curvature, and is generally cylindrical. The slider 30 is made of rolled steel for welding steel (SM490A, B, C, or SN490B, C, or S45C) or the like, and has a load-bearing strength of approximately 60 N/mm2 (60 MPa) of surface pressure.

Friction materials (not shown) made of at least PTFE are attached to the upper and lower sliding surfaces 30a of the slider 30. The friction materials are formed of a double weave, and the double weave is formed of PTFE fibers and fibers (high strength fibers) having a higher tensile strength than PTFE fibers. Here, examples of "fibers having a higher tensile strength than PTFE fibers" include polyamides such as nylon 6-6, nylon 6, and nylon 4-6, polyesters such as polyethylene terephthalate (PET), polytrimethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate, and fibers such as para-aramid. Other examples include fibers such as meta-aramid, polyethylene, polypropylene, glass, carbon, polyphenylene sulfide (PPS), LCP, polyimide, and PEEK. Furthermore, fibers such as heat-sealed fibers, cotton, and wool may also be applied. Among them, PPS fibers, which have excellent chemical resistance and hydrolysis resistance and extremely high tensile strength, are preferable. In addition, the friction material made of at least PTFE may be a fabric containing PTFE fibers other than a double weave, or may be a friction material made only of PTFE, a friction material made of a composite material of PTFE and other resins, or a friction material with a laminated structure of a friction material made of PTFE and a friction material made of other resins.

The connecting means 40 can connect the upper shoe 10 and the lower shoe 20. The connecting means 40 prevents the upper shoe 10 and the lower shoe 20 from moving relative to each other due to a small horizontal force applied by, for example, a typhoon. The connecting means 40 is located between the upper shoe 10 and the lower shoe 20. When the horizontal force applied to the vibration isolation device 100 is greater than a predetermined value, the connecting means 40 can move toward the lower structure L to release the connection between the upper shoe 10 and the lower shoe 20. Details of the connecting means 40 will be described later.

3 or 4, the connecting means 40 is provided at a corner of the upper shoe 10 or the lower shoe 20. Therefore, the recess 10d of the upper shoe 10 and the through hole 20h of the lower shoe 20 are provided at the corners of the upper shoe 10 and the lower shoe 20, respectively.
As shown in Fig. 3 or 4, the connecting means 40 does not overlap with the upper part Lt of the lower structure L when viewed in the vertical direction. In other words, the corners of the upper shoe 10 or the lower shoe 20 are positioned so as to protrude from the upper part Lt of the lower structure L when viewed in the vertical direction. The connecting means 40 is provided in a portion protruding from the upper part Lt of the lower structure L. This makes it possible to check the state of the connecting means 40 by looking into it from below the lower shoe 20.

The storage means 50 can store the connecting means 40 that has moved toward the lower structure L. The storage means 50 is, for example, a basket-shaped member. It is provided below the through-hole 20h of the lower shoe 20. As a result, as shown in FIG. 2, the connecting means 40 that has moved toward the lower structure L is received and stored. As a result, the storage means 50 has the function of making it easier to replace the connecting means 40, and the function of preventing the connecting means 40 that has moved toward the lower structure L from moving irregularly and becoming lost.

(Details of the connecting means 40)
As described above, the connecting means 40 connects the upper shoe 10 and the lower shoe 20. This prevents the upper shoe 10 and the lower shoe 20 from moving relative to each other when a small horizontal force is applied to the vibration isolation device 100. A small horizontal force is, for example, a horizontal force applied to the upper structure U and the vibration isolation device 100 due to a typhoon or the like. When a large horizontal force is applied to the vibration isolation device 100, the connecting means 40 can release the connection between the upper shoe 10 and the lower shoe 20. This allows the upper shoe 10 and the lower shoe 20 to move relative to each other. This makes it possible to attenuate a large horizontal force applied to the vibration isolation device 100.

In this embodiment, a large horizontal force is, for example, a horizontal force applied to the seismic isolation device 100 by an earthquake. Here, the earthquake levels are defined as follows based on the description in the "2020 Building Structure-Related Technical Standards Manual" (edited by the Building Administration Information Center and the Japan Building Disaster Prevention Association; page 71). That is, a seismic intensity that rarely occurs (about once every 50 years) is Level 1. A Level 1 earthquake is likely to occur at least once during the useful life of a building, for example. A seismic intensity that extremely rarely occurs (about once every 500 years) is Level 2. Furthermore, extremely large seismic motion that is larger in scale than Level 2 seismic motion is Level 3.

The connecting means 40 can release the connection between the upper shoe 10 and the lower shoe 20 when the horizontal force on the seismic isolation device 100 is greater than a predetermined value. The predetermined value can be appropriately determined according to a horizontal force equivalent to any one of a level 1 earthquake to a level 3 earthquake, in accordance with the seismic isolation function required for the upper structure U.
A number of examples of the connecting means 40 in this embodiment will be described below.

(First Example of Connecting Means 40)
As shown in Figs. 1 and 5, the first connecting means 41 (connecting means 40) includes a contact means 41a and a fuse metal member 41b (plastic deformation means).
The abutment means 41a abuts against the recess 10d of the upper shoe 10. In this embodiment, at least the abutment surface 41as of the abutment means 41a is a spherical surface. The abutment surface 41as is a portion of the abutment means 41a that abuts against the upper shoe 10. In this embodiment, the abutment means 41a is a sphere. The portion of the recess 10d that abuts against the abutment surface 41as is also a spherical surface having the same curvature as the abutment surface 41as.

The fuse hardware 41b is provided below the abutment means 41a. As shown in FIG. 1, the fuse hardware 41b is placed in the through hole 20h of the lower shoe 20. As shown in FIG. 5, the fuse hardware 41b has a recess 41bd. The fuse hardware 41b accommodates the abutment means 41a inside the recess 41bd. At this time, as shown in FIG. 5, the abutment surface 41as of the abutment means 41a protrudes from the fuse hardware 41b. As a result, the abutment surface 41as of the abutment means 41a abuts against the recess 10d of the upper shoe 10.

When a horizontal force is applied to the vibration isolation device 100, the horizontal force acts to move the upper shoe 10 and the lower shoe 20 relative to each other in the horizontal direction. Then, a force is applied from the recess 10d of the upper shoe 10 toward the abutment surface 41as, tending to move the abutment means 41a toward the lower structure L. Therefore, a force is applied from the abutment means 41a toward the fuse hardware 41b, tending to deform the fuse hardware 41b.

At this time, if the horizontal force is not greater than a predetermined value, the fuse hardware 41b will not be deformed by the force applied from the abutting means 41a. In other words, if the horizontal force is not greater than a predetermined value, the abutting means 41a will be maintained in abutment with the upper shoe 10.
When the horizontal force is greater than a predetermined value, the fuse hardware 41b is plastically deformed by the force applied by the abutment means 41a, as shown in Fig. 6. In other words, when the horizontal force is greater than a predetermined value, the abutment means 41a plastically deforms the fuse hardware 41b. As a result, the abutment means 41a no longer abuts against the upper shoe 10 and moves toward the lower structure L. This releases the connection between the upper shoe 10 and the lower shoe 20. As a result, as shown in Figs. 2 and 7, the upper shoe 10 and the lower shoe 20 become capable of relative movement in the horizontal direction. It is preferable that the shape and material of the fuse hardware 41b be appropriately determined in accordance with the above-mentioned predetermined value conditions.

The fuse hardware 41b will eventually break if the horizontal force is greater than a predetermined value. As a result, when the fuse hardware 41b breaks, the abutment means 41a will fall downward from the through hole 20h. The fallen abutment means 41a will be stored in the storage means 50 described above. This allows the worker to visually check the storage means 50 to confirm that the connection between the upper shoe 10 and the lower shoe 20 has been released.

(Second Example of Connecting Means 40)
As shown in FIGS. 8, 9 and 10, the second connecting means 42 (connecting means 40) includes a contact means 41a, a fuse plate 42b (plastic deformation means), and a plate support portion 42c.
The contact means 41a is the same as the contact means 41a provided in the first connecting means 41, and therefore a description thereof will be omitted.

The fuse plate 42b is provided below the abutment means 41a. As shown in FIG. 8, the fuse plate 42b is supported by the plate support portion 42c and placed in the through hole 20h of the lower shoe 20. As shown in FIG. 11, the fuse plate 42b has a bent portion 42bb. The bent portion 42bb functions as a reinforcing bead in the fuse plate 42b. For example, as shown in FIG. 4, four fuse plates 42b are provided at intervals in the circumferential direction of the abutment means 41a when viewed along the vertical direction.

The plate support portion 42c supports the fuse plate 42b as described above. The plate support portion 42c is, for example, a cylindrical member. The plate support portion 42c is disposed in the through hole 20h of the lower shoe 20 together with the fuse plate 42b. The plate support portion 42c may be made of, for example, metal or resin.

The plate support portion 42c houses the abutment means 41a. The lower portion of the abutment means 41a is supported by the fuse plate 42b. At this time, the abutment surface 41as of the abutment means 41a protrudes from the plate support portion 42c. As a result, the abutment surface 41as of the abutment means 41a abuts against the recess 10d of the upper shoe 10.

As shown in FIG. 9, the inner diameter of the plate support portion 42c is preferably large at the bottom and narrows toward the top. This allows the fuse plate 42b to support the bottom of the abutment means 41a below the plate support portion 42c. It is preferable that the abutment means 41a be supported above the plate support portion 42c so that it does not move in the horizontal direction.

When a horizontal force is applied to the vibration isolation device 100, the horizontal force acts to move the upper shoe 10 and the lower shoe 20 relative to each other in the horizontal direction. Then, a force is applied from the recess 10d of the upper shoe 10 toward the abutment surface 41as, tending to move the abutment means 41a toward the lower structure L. Therefore, a force is applied from the abutment means 41a toward the fuse plate 42b, tending to deform the fuse plate 42b.

At this time, if the horizontal force is not greater than a predetermined value, the fuse plate 42b will not be deformed by the force applied by the contact means 41a. In other words, if the horizontal force is not greater than a predetermined value, the contact means 41a will be maintained in contact with the upper shoe 10.
When the horizontal force is greater than a predetermined value, the fuse plate 42b is plastically deformed by the force applied by the abutment means 41a, as shown in Fig. 12. In other words, when the horizontal force is greater than a predetermined value, the abutment means 41a plastically deforms the fuse plate 42b. As a result, the abutment means 41a is no longer in contact with the upper shoe 10 and moves toward the lower structure L. This releases the connection between the upper shoe 10 and the lower shoe 20. As a result, as shown in Fig. 13, the upper shoe 10 and the lower shoe 20 become relatively movable in the horizontal direction. It is preferable that the shape and material of the fuse plate 42b be appropriately determined in accordance with the above-mentioned predetermined value conditions.

When the horizontal force is greater than a predetermined value, the fuse plate 42b will eventually remain permanently bent downward. Here, as described above, the fuse plate 42b has a bent portion 42bb. Therefore, when a certain amount of force or more is applied to the fuse plate 42b from above, it will bend downward in an instant, similar to the buckling phenomenon. When the fuse plate 42b is bent downward in this way, the abutment means 41a falls downward from the through hole 20h. The fallen abutment means 41a is stored in the storage means 50 described above. This allows the worker to visually check the storage means 50 to confirm that the connection between the upper shoe 10 and the lower shoe 20 has been released.

(Third Example of Connecting Means 40)
As shown in FIG. 14, the third connecting means 43 (connecting means 40) includes an abutting means 41a, a fuse spring 43b, a fuse block 43bb, a spring support portion 43c, and a lever 43L.
The contact means 41a is the same as the contact means 41a provided in the first connecting means 41, and therefore a description thereof will be omitted.

The fuse spring 43b is provided on the side of the abutment means 41a. As shown in FIG. 14, the fuse spring 43b supports the abutment means 41a via a fuse block 43bb. The fuse block 43bb is a block-shaped member. The fuse block 43bb may be made of, for example, metal or resin. The surface of the fuse block 43bb that contacts the abutment means 41a has a shape that conforms to the outer surface of the abutment means 41a. As shown in FIG. 14, the fuse spring 43b is supported by the spring support portion 43c and is placed in the through hole 20h of the lower shoe 20. The fuse spring 43b is a coil spring. For example, four fuse springs 43b are provided at intervals around the abutment means 41a when viewed along the vertical direction.

The spring support portion 43c supports the fuse spring 43b as described above. The spring support portion 43c is, for example, a cylindrical member. The spring support portion 43c is disposed in the through hole 20h of the lower shoe 20 together with the fuse spring 43b. The spring support portion 43c may be made of, for example, metal or resin.

The spring support portion 43c houses the abutment means 41a. The side of the abutment means 41a is supported by the fuse spring 43b via the fuse block 43bb as described above. At this time, the abutment surface 41as of the abutment means 41a protrudes from the spring support portion 43c. As a result, the abutment surface 41as of the abutment means 41a abuts against the recess 10d of the upper shoe 10.

As shown in FIG. 14, the inner diameter of the spring support portion 43c is preferably large at the bottom and narrows toward the top. It is preferable that the spring support portion 43c is configured to support the contact means 41a above the spring support portion 43c so that it does not move in the horizontal direction.

The lever 43L is used to manipulate the position of the fuse block 43bb. The lever 43L extends upward from the fuse block 43bb, for example. When placing the abutment means 41a on the third connecting means 43, the lever 43L is used to move the fuse block 43bb with the lever 43L to form an area in which the abutment means 41a can be placed.

When a horizontal force is applied to the vibration isolation device 100, the horizontal force acts to move the upper shoe 10 and the lower shoe 20 relative to each other in the horizontal direction. Then, a force is applied from the recess 10d of the upper shoe 10 toward the abutment surface 41as, tending to move the abutment means 41a toward the lower structure L. Therefore, a force is applied from the abutment means 41a toward the fuse spring 43b, tending to deform the fuse spring 43b.

At this time, if the horizontal force is not greater than a predetermined value, the fuse spring 43b is not deformed by the force applied from the abutting means 41a. In other words, if the horizontal force is not greater than a predetermined value, the abutting means 41a is maintained in abutment with the upper shoe 10.
When the horizontal force is greater than a predetermined value, the fuse spring 43b is deformed by the force applied from the abutment means 41a, as shown in Fig. 15. In other words, when the horizontal force is greater than a predetermined value, the abutment means 41a deforms the fuse spring 43b. As a result, the abutment means 41a no longer abuts against the upper shoe 10 and moves toward the lower structure L. This releases the connection between the upper shoe 10 and the lower shoe 20. As a result, the upper shoe 10 and the lower shoe 20 become capable of relative movement in the horizontal direction. It is preferable that the shape and material of the fuse spring 43b be appropriately determined in accordance with the above-mentioned predetermined value conditions.

When the horizontal force is greater than a predetermined value, the abutment means 41a deforms the fuse spring 43b and moves downward from the fuse spring 43b. As a result, when the horizontal force is greater than a predetermined value, the abutment means 41a falls downward from the through hole 20h. The fallen abutment means 41a is stored in the storage means 50 described above. This allows the worker to visually check the storage means 50 to confirm that the connection between the upper shoe 10 and the lower shoe 20 has been released.

(Method of replacing the vibration isolation device 100)
Next, a method for replacing the vibration isolation device 100 according to this embodiment will be described. Replacing the vibration isolation device 100 means replacing the connection means 40 of the vibration isolation device 100 in particular. The method for replacing the vibration isolation device 100 includes a removal step and an installation step.
The removal step is a step of removing the connecting means 40 stored in the storage means together with the storage means. The attachment step is a step of attaching a new connecting means 40 from the lower side of the lower shoe 20 after the removal step.

In the first and second examples above, once the plastic deformation means (fuse hardware 41b and fuse plate 42b) has undergone plastic deformation, it cannot be reused. In contrast, the contact means 41a is not designed to undergo plastic deformation. For this reason, when replacing the connecting means 40, the contact means 41a may be reused. If the contact means 41a is reusable, then it is sufficient to replace only the plastic deformation means by following the steps described above.

As described above, the vibration isolation device 100 according to this embodiment is provided with a connecting means 40 that can connect the upper shoe 10 and the lower shoe 20. By connecting the upper shoe 10 and the lower shoe 20 with the connecting means 40, it is possible to prevent the vibration isolation device 100 from being activated by small horizontal forces applied by typhoons, etc. In addition, the connecting means 40 is one of the components of the vibration isolation device 100. Therefore, for example, the installation space can be reduced compared to a case where a wind-resistant device is provided separately from the vibration isolation device 100.

The connecting means 40 is provided at the corners of the upper shoe 10 or the lower shoe 20. This makes it easier to visually check the state of the connecting means 40 from the outside. This improves the ease of managing the vibration isolation device 100. Also, for example, by providing the connecting means 40 symmetrically at multiple locations at the corners of the upper shoe 10 or the lower shoe 20, it is possible to achieve optimal load balance.

The lower shoe 20 is provided on the upper part Lt of the lower structure L. In other words, the lower shoe 20 is provided at a higher position than the other parts of the lower structure L than the upper part Lt. The connecting means 40 does not overlap with the upper part Lt when viewed along the vertical direction. In other words, the connecting means 40 is located outside the upper part Lt. This allows the connecting means 40 to be visually inspected by looking down on it. This makes it easier to check the condition of the connecting means 40. For example, when the connecting means 40 comes off the upper shoe 10 and the lower shoe 20 and replacement of the connecting means 40 becomes necessary, the worker can perform the replacement while standing. This further improves the ease of management of the seismic isolation device 100.

In addition, when the horizontal force on the vibration isolation device 100 is greater than a predetermined value, the connecting means 40 can move toward the lower structure L to release the connection between the upper shoe 10 and the lower shoe 20. By setting the predetermined value to the magnitude of the horizontal force applied by a level 1 earthquake motion, for example, the vibration isolation device 100 can be activated only for horizontal forces equivalent to earthquakes of level 1 or higher. Since the connecting means 40 can move toward the lower structure L to release the connection between the upper shoe 10 and the lower shoe 20, it is possible to easily visually check whether the connection by the connecting means 40 has been released. This can further improve the ease of management of the vibration isolation device 100.

The storage means 50 can also store the connecting means 40 that has moved toward the lower structure L. This allows the worker to visually check the storage means 50 to see whether the connection by the connecting means 40 has been released. This further improves the ease of management of the seismic isolation device 100.

The abutment means 41a included in the connecting means 40 abuts against the upper shoe 10 when the horizontal force is not greater than a predetermined value, and does not abut against the upper shoe 10 when the horizontal force is greater than the predetermined value. In this way, by making the connecting means 40 a simple structure, the connecting means 40 can be made at low cost. The connecting means 40 can be easily replaced. By relying on a physical action to release the connection when the horizontal force exceeds the predetermined value, variation in the predetermined value can be reduced.

The abutment surface 41as of the abutment means 41a that abuts against the upper shoe 10 is a spherical surface. This makes it possible to prevent horizontal forces from causing the connecting means 40 to bite into the upper shoe 10, compared to when the abutment surface 41as is made up of the sides of a rectangular column. This makes it easier to release the connection by the connecting means 40.

When the horizontal force is greater than a predetermined value, the abutment means 41a plastically deforms the plastic deformation means, so that it no longer abuts against the upper shoe 10 and moves toward the lower structure L. In other words, the predetermined value is the elastic limit of the plastic deformation means. In this way, by determining the predetermined value based on the physical properties of the plastic deformation means, it is possible to reduce variation in the predetermined value.

The method also includes a removal step in which the connecting means 40 stored in the storage means 50 is removed together with the storage means 50, and an installation step in which a new connecting means 40 is installed from the underside of the lower shoe 20 after the removal step. This makes it easy to replace the connecting means 40. This improves the maintainability of the vibration isolation device 100.

The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, the contacting means 41a is not limited to a sphere. For example, the contacting means 41a may have a spherical surface only on the contact surface 41as, and the lower portion may not be a spherical surface.
The contact surface 41as of the contact means 41a is not limited to a spherical surface. For example, instead of the contact surface 41as, a side located between the side surfaces of a prismatic member may contact the upper shoe 10.

In addition, the components in the above embodiment may be replaced with well-known components as appropriate without departing from the spirit of the present invention, and the above-mentioned modifications may be combined as appropriate.

10 Upper shoe 10a Slide surface 20 Lower shoe 20a Slide surface 30 Slider 30a Slide surface 40 Connecting means 41a Contact means 41as Contact surface 50 Storage means 100 Vibration isolator L Lower structure Lt Upper part

Claims (7)

A vibration isolation device comprising an upper shoe, a lower shoe, and a slider that slides between the upper shoe and the lower shoe,
A connecting means is provided for connecting the upper shoe and the lower shoe,
The lower shoe is provided on the upper part of the lower structure,
The connecting means is disposed in plurality on the outer side of the contour of the upper part and on the inner side of the contour of the lower shoe when viewed in the vertical direction,
The plurality of connecting means are disposed in a distributed manner along a contour of the lower shoe when viewed in a vertical direction,
The connecting means does not overlap the upper portion when viewed along the vertical direction.
A vibration isolation device characterized by: A vibration isolation device comprising an upper shoe, a lower shoe, and a slider that slides between the upper shoe and the lower shoe,
A connecting means is provided for connecting the upper shoe and the lower shoe,
The lower shoe is provided on the lower structure,
When the horizontal force acting on the vibration isolation device is greater than a predetermined value, the connecting means can move toward the lower structure to release the connection between the upper shoe and the lower shoe.
A vibration isolation device characterized by: A storage means provided under the lower shoe;
Further comprising:
The storage means can store the connecting means that has moved toward the lower structure.
The vibration isolation device according to claim 2 . A vibration isolation device comprising an upper shoe, a lower shoe, and a slider that slides between the upper shoe and the lower shoe,
A connecting means is provided for connecting the upper shoe and the lower shoe,
The connecting means includes an abutting means,
the abutment means abuts against the upper shoe when a horizontal force acting on the vibration isolation device is not greater than a predetermined value, and does not abut against the upper shoe when the horizontal force is greater than the predetermined value.
A vibration isolation device characterized by: The contact surface of the contact means that contacts the upper shoe is a spherical surface.
5. The vibration isolation device according to claim 4 . The lower shoe is provided on the lower structure,
the connecting means includes a plastic deformation means that plastically deforms when the horizontal force is greater than the predetermined value, the plastic deformation means being provided below the abutment means;
When the horizontal force is greater than a predetermined value, the abutment means plastically deforms the plastic deformation means, so that the abutment means no longer abuts against the upper shoe and moves toward the lower structure.
6. The vibration isolation device according to claim 4 or 5 . A method for replacing a vibration isolator according to claim 3 , comprising the steps of:
a removing step of removing the connecting means stored in the storing means together with the storing means;
After the removing step, a mounting step of mounting a new connecting means from the lower side of the lower shoe;
A method for replacing a vibration isolation device, comprising:

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