JP2022077669A - Seismic isolator and seismic isolation stand - Google Patents

Abstract

To provide a seismic isolator which secures a seismic isolation property, and can secure vertical stiffness, and a seismic isolation stand.SOLUTION: A seismic isolator comprises a lower plate 3, a moving board 5 arranged on the lower plate 3, and an upper plate 7 arranged on the moving board 5. Lower plate rails 9, 9 extending in a pair of Y-directions are arranged at an upper face of the lower plate 3, a pair of upper plate rails 11, 11 extending in an X-direction while intersecting with the lower plate rails 9, 9 are arranged at a lower face of the upper plate 7, and a pair of lower plate rollers 13, 13 rolling on a pair of the lower plate rails 9, 9 with axial lines set at one opposing corner of a virtual square when setting the virtual square having a substantially-square shape in a plane view on the moving board 5, and a pair of upper plate rollers 15, 15 moving on a pair of the upper plate rails 11, 11 with axial lines set at the other opposing corner of the virtual square are arranged at the moving board 5.SELECTED DRAWING: Figure 1

Description

The present invention relates to a seismic isolation device and a seismic isolation table.

Conventionally, for the purpose of reducing the damage of the existing equipment in the factory building in the event of an earthquake, the equipment is jacked up, and a seismic isolation table including a seismic isolation device is placed under the equipment to make it seismic isolated. Is being done.

The seismic isolation device shown in Patent Document 1 is a seismic isolation device composed of an upper board, a moving board, a lower board, and rails and rollers arranged between the upper and lower boards, and a plurality of seismic isolation devices are provided for one device. By connecting the divided seismic isolation devices into one seismic isolation device, it is easy to apply to existing equipment, and the degree of freedom to change the shape of the seismic isolation device according to the shape of the equipment is high. It is mentioned as an advantage.

Japanese Patent No. 54164946

However, in the seismic isolation device described in Patent Document 1, the range in which rails can be arranged is narrow due to restrictions such as the shape of the device and the piping space, and the stability of the seismic isolation table and the vertical to walking on the upper board are vertical. It may be difficult to secure rigidity. The stability and vertical rigidity of the seismic isolation table depend on the position of the fulcrum (the position of the rollers) and the rigidity of the upper and moving plates. It is conceivable to increase the number of fulcrums to ensure the stability of the seismic isolation table, but there are many places where the rollers and rails do not normally contact due to manufacturing errors and deformation of the upper and moving boards when installing equipment. Therefore, even if the redundancy at the time of an earthquake is improved, it is difficult to improve the vertical rigidity when walking on the upper board. In order to secure the vertical rigidity during walking, it is necessary to specify the transmission path of the vertical force (from the upper board to the lower board) when walking on the upper board, and to secure the member rigidity on the path. It is conceivable to simply increase the thickness of the upper plate and the moving plate to increase the rigidity, but rationality is required because it causes an increase in cost and device height.

The present invention has been made in view of the above-mentioned circumstances, and the problem to be solved by the present invention is to provide a seismic isolation device and a seismic isolation table capable of ensuring seismic isolation characteristics and ensuring vertical rigidity. be.

The present invention employs the following means in order to solve the above problems.
That is, the seismic isolation device for reducing earthquake damage of the present invention includes a lower plate, a moving plate arranged on the lower plate, and an upper plate arranged on the moving plate, and the lower plate is provided. A pair of lower plate rails extending in the Y direction are provided on the upper surface of the upper plate, and a pair of upper plate rails extending in the X direction orthogonal to the lower plate rail are provided on the lower surface of the upper plate. A pair of lower plate rollers that roll on the pair of lower plate rails that place axes at one of the opposite corners of the virtual quadrangle when a virtual quadrangle that is substantially square in plan view on the moving board is set on the board. And a pair of upper plate rollers that roll on the pair of upper plate rails whose axes are placed at the other opposite corners of the virtual quadrangle.
According to such an invention, a pair of lower plate rollers for placing axes in one opposite corner of the virtual quadrangle and a pair of upper plate rollers for placing axes in the other opposite corners are provided. It is possible to realize a seismic isolation device that can secure seismic isolation characteristics and ensure vertical rigidity.

In one aspect of the present invention, the pair of lower plate rollers and the pair of upper plate rollers are pivotally supported by providing openings in the moving plate, and the intervals between the openings are even. ..
According to such a configuration, the intervals between the openings are evenly provided, so that vertical rigidity can be reliably ensured.

In one aspect of the present invention, a pair of second lower plate rails is provided on the outer side of the pair of lower plate rails, and a pair of second upper plate rails are provided on the outer side of the pair of upper plate rails. A pair of second lower plate rollers that roll on the pair of second lower plate rails is provided outward with each of the pair of lower plate rollers and the pair of upper plate rollers sandwiched between them. A pair of second upper plate rollers that are provided and roll outward on the pair of second upper plate rails so as to sandwich each of the pair of upper plate rollers and the pair of lower plate rollers. Is provided.
According to such a configuration, since the second lower plate roller and the second upper plate roller are provided on the outer sides of the lower plate roller and the upper plate roller, the seismic isolation characteristics and the vertical rigidity can be improved. ..

In one aspect of the present invention, at least one pair of upper plates is inside a triangle set at the midpoint of the axis of the pair of lower plate rollers and one of the pair of second lower plate rollers. An end point that pivotally supports the rollers is included, and at least one of the above is inside a triangle set at the midpoint of the axis of the pair of upper plate rollers and one of the pair of second upper plate rollers. It is characterized by including an end point that pivotally supports a pair of lower plate rollers.
According to such a configuration, the end point that pivotally supports the upper plate roller is included in the triangle set at the midpoint of the axes of the lower plate roller and the second lower plate roller, and the upper plate roller and the second lower plate roller are included. Since the end points that pivotally support the lower plate rollers are included in the triangle set at the midpoint of the axis of the upper plate rollers 2, each roller can be arranged at an appropriate position.

The seismic isolation table of the present invention comprises the plurality of seismic isolation devices described above, a structure made of H-shaped steel arranged on the seismic isolation device, and a top plate arranged on the structure. At least one seismic isolation device has the pair of upper plate rails and the H-shaped steel extending in the same direction, and the position of the web of the H-shaped steel is the center between the pair of upper plate rails. It is characterized by being arranged in such a manner.
According to such an invention, the seismic isolation device is arranged so that the position of the web of the H-section steel is at the center between the pair of upper plate rails, so that the vertical load from the H-section steel is effectively reduced. Since it can be transmitted to the plate, it is possible to realize a seismic isolation table that ensures seismic isolation characteristics and secures vertical rigidity.

According to the present invention, it is possible to provide a seismic isolation device and a seismic isolation table capable of ensuring seismic isolation characteristics and ensuring vertical rigidity.

It is a side view of the seismic isolation device which concerns on embodiment of this invention. It is the AA arrow view of FIG. It is a BB arrow view of FIG. 1. It is a CC arrow view of FIG. It is the BB arrow view of FIG. 1 and is the figure for demonstrating the structure of this embodiment. It is the BB arrow view of FIG. 1 and is the figure for demonstrating the structure of this embodiment. It is a top view of the seismic isolation table which concerns on embodiment of this invention. FIG. 7 is a cross-sectional view taken along the line DD of FIG. It is a top view of the seismic isolation table in the conventional example. It is a side view of the seismic isolation table in the conventional example. 9 is a cross-sectional view taken along the line DD of FIG.

Hereinafter, a mode for implementing the seismic isolation device and the seismic isolation table according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows a side view of the seismic isolation device according to the embodiment of the present invention. FIG. 2 is an arrow view taken along the line AA of FIG. FIG. 3 is a view taken along the line BB of FIG. FIG. 4 is a view taken along the line CC of FIG.

The seismic isolation device 1 shown in FIGS. 1 to 4 includes a lower plate 3, a moving plate 5 arranged on the lower plate 3, and an upper plate 7 arranged on the moving plate 5. .. As shown in FIG. 4, the upper surface of the lower plate 3 is provided with a pair of lower plate rails 9 and 9 extending in the Y direction. As shown in FIG. 2, a pair of upper plate rails 11 and 11 extending in the X direction orthogonal to the lower plate rails 9 and 9 are provided on the lower surface of the upper plate 7.

As shown in FIG. 3, when a virtual quadrangle S having a substantially square view on a plane on the moving board 5 is set on the moving board 5, a pair of lower plates having an axis g placed at one opposite corner of the virtual quadrangle S. A pair of lower plate rollers 13 and 13 that roll on the rails 9 and 9 are provided. Further, in the other facing corner of the virtual quadrangle S, a pair of upper plate rollers 11 rolling on the pair of upper plate rails 11 and 11 having an axis g placed in the other facing corner of the virtual quadrangle S. 15 is provided.

As shown in FIG. 5, the pair of lower plate rollers 13 and 13 and the pair of upper plate rollers 15 and 15 are pivotally supported by providing an opening K in the moving plate 5, and the intervals between the respective openings K are uniform with a width h. It is provided in.

As shown in FIG. 4, a pair of second lower plate rails 17 and 17 are provided on the outer side of the pair of lower plate rails 13 and 13. As shown in FIG. 2, a pair of second upper plate rails 19 and 19 are provided on the outer side of the pair of upper plate rails 11 and 11. As shown in FIG. 3, the pair of lower plate rollers 13 and 13 and the pair of upper plate rollers 15 and 15 are sandwiched and rolled outward on the pair of second lower plate rails 17 and 17. A pair of moving second lower plate rollers 21, 21 are provided. Further, a pair of first rollers rolling on the pair of second upper plate rails 19 and 19 outward with the pair of upper plate rollers 15 and 15 and each of the pair of lower plate rollers 13 and 13 sandwiched outward. The upper plate rollers 23, 23 of 2 are provided.

As shown in FIG. 6, at least one pair inside the triangle T1 set at the midpoint of the axis g between the pair of lower plate rollers 13 and 13 and one of the pair of second lower plate rollers 21 and 21. The end points j1 that pivotally support the upper plate rollers 15 and 15 are included. Further, at least one pair of lower plate rollers 13 is inside the triangle T2 set at the midpoint of the axis g of the pair of upper plate rollers 15 and 15 and one of the pair of second upper plate rollers 23 and 23. , 13 is included as an end point j2.

As described above, the original configuration of the rails 9, 17 provided on the lower plate 3, the plurality of rollers 13, 15, 21, 23 provided on the moving board 5, and the rails 11 and 19 provided on the upper plate 5. Then, first, on the lower plate 3, the rollers 13 and 21 of the moving plate 5 can be rolled with respect to the rails 9 and 13 of the lower plate 3, that is, so as to be able to swing in the Y direction in FIG. The moving board 5 is arranged. On the moving board 5, the rollers 15 and 23 of the moving board 5 can roll on the rails 11 and 19 of the upper plate 7, that is, the upper plate can swing in the X direction in FIG. 7 is arranged.

The seismic isolation device 1 configured as described above will be described later, but a plurality of seismic isolation devices 1 are arranged, and a top plate is provided on the seismic isolation device 1 to form a seismic isolation table. Equipment that requires seismic isolation is placed on the top plate. In the event of an earthquake, the Y-direction component swings from the lower plate over the lower plate rails 9 and 9 and the second lower plate rails 17 and 17, with the lower plate rollers 13, 13 and the second. The lower plate rollers 21 and 21 are absorbed by rolling. The swing of the component in the X direction means that the upper plate rollers 15 and 15 and the second upper plate rollers 23 and 23 roll along the upper plate rails 11 and 11 and the second upper plate rails 19 and 19. Absorbed by.

As described above, in the present embodiment, the lower plate rollers 13 and 13 for placing the axis g at one opposite corner of the virtual quadrangle S are provided, and the upper plate roller 15 for placing the axis g at the other opposite corner. Since the 15 is provided, the load in the vertical direction can be evenly transmitted. The lower plate rollers 13 and 13 and the upper plate rollers 15 and 15 are pivotally supported by opening openings K in the moving plate 5, and the intervals between the respective openings K are evenly provided, so that the rollers are provided without impairing the vertical rigidity. be able to.

Second lower plate rollers 21 and 21 capable of rolling in the same direction are provided on the outer sides of the lower plate rollers 13 and 13 with the upper plate rollers 15 and 15 interposed therebetween. Since the second upper plate rollers 23, 23 that can roll in the same direction are provided so as to sandwich the lower plate rollers 13, 13, the vertical rigidity can be further ensured.

The inside of the triangle set at the midpoint of the axis g of the lower plate rollers 13 and 13 and one of the second lower plate rollers 21 and 21 includes an end point that pivotally supports at least one upper plate roller 15. Inside the triangle set at the midpoint of the axis g of the upper plate rollers 15, 15 and one of the second upper plate rollers 23, 23, an end point that pivotally supports at least one lower plate roller 13. Is included, the load of at least one lower plate roller 13 is transmitted to the three rollers of the upper plate rollers 15, 15 and the second upper plate roller 23, and the load of at least one upper plate roller 15 is transmitted. , The lower plate rollers 13, 13 and the second lower plate roller 21 are transmitted to the three rollers. As a result, the vertical force transmitted from the inner lower plate roller 13 and the upper plate roller 15 is reliably transmitted up and down via the moving plate 5, and the vertical rigidity of the seismic isolation device alone can be ensured.

Therefore, under the above configuration, in the seismic isolation device 1 of the present embodiment, the arrangement positions of the rails and rollers in the divided seismic isolation device 1 are centrally arranged in the center of the seismic isolation device 1 and below the moving board 5. By minimizing the transmission path of the vertical force transmitted to the plate 3, the vertical rigidity of the seismic isolation device 1 can be increased to the maximum without increasing the height of the moving board 5. Thus, according to the present embodiment, it is possible to realize the seismic isolation device 1 that can secure the seismic isolation characteristics and secure the vertical rigidity.

Next, a seismic isolation table including a plurality of seismic isolation devices 1 will be described. FIG. 7 is a plan view of the seismic isolation table according to the embodiment of the present invention. FIG. 8 is a cross-sectional view taken along the line DD of FIG. The seismic isolation table 10 according to the present embodiment shown in FIGS. 7 and 8 includes a plurality of seismic isolation devices 1, a structure 27 made of H-shaped steel 25 arranged on the plurality of seismic isolation devices 1, and this structure. The top plate 29 arranged on the 27 and at least one seismic isolation device 1b have the pair of upper plate rails 11 and 11 and the H-shaped steel 25 extending in the same direction, and the H-shaped steel 25 is extended. The position of the web 25b of the steel 25 is arranged so as to be the center between the pair of upper plate rails 11 and 11. In FIG. 8, the H-shaped steel 25 and the upper plate rails 11 and 11 both extend in a direction perpendicular to the paper surface. Further, each seismic isolation device 1 is arranged on the pedestal 31 as shown in FIG.

FIG. 9 is a plan view showing the seismic isolation table 100 in the conventional example. FIG. 10 is a side view of the seismic isolation table 100 in the conventional example. FIG. 11 is a cross-sectional view taken along the line DD of FIG. In the conventional example, the plurality of seismic isolation devices 1 are directly arranged under the top plate 29a without going through the structure 27 made of the H-shaped steel 25 shown in FIGS. 7 and 8.

Unless otherwise restricted, the seismic isolation device 1 is arranged at an even interval under the top plate 29a so as to support the end of the top plate as a pair in the vertical direction of the paper surface as in the seismic isolation device 1a of FIG. Will be done. However, depending on the position inside the factory building where the seismic isolation table 100 is installed, an opening H for equipment may be provided. This opening H is provided to supply the device with a power source, a chemical substance such as a gas or a liquid, or the like, which is necessary for the operation of the device. In this case, it cannot be arranged in pairs like the seismic isolation device 1a, and it may have to be arranged like the seismic isolation device 1b in consideration of the clearance R related to the swing of the seismic isolation device 1. be.

In the case of the above conventional example, as shown in FIG. 11, when the heavy objects M1 and M2 are loaded on both sides with the seismic isolation device 1b as a fulcrum, and the weights of the heavy objects M1 and M2 are not equal on the left and right. If these vertical forces are simply transmitted to the seismic isolation device 1b, the upper plate 7 and the moving board 5 will rise, the supporting state will become unstable, and the vibration properties during walking will be adversely affected. It ends up.

As shown in FIGS. 7 and 8, even when the seismic isolation table 10 according to the present embodiment is arranged like the seismic isolation device 1b, which is unstable in the conventional example, the seismic isolation device 1b and the top plate are here. 29 abuts only on the lower flange portion 25a of the H-shaped steel 25 arranged in the center of the seismic isolation device 1b extending in the left-right direction in FIG. 8, and the vertical force transmitted to the seismic isolation device 1b at this time is Since it is transmitted from the H-shaped steel web 25b via the frame of the H-shaped steel 25, it is transmitted intensively near the center of the seismic isolation device 1b, and the moving board 5 and the upper plate 7 are ensured to be stable without floating. be able to. At this time, by making the direction of the H-shaped steel axis (the direction in which the H-shaped steel extends) parallel to the directions of the upper plate rails 11 and 11 arranged on the upper plate 7 of the seismic isolation device 1b, the seismic isolation device 1b Since the load point F is always located inside the upper plate rollers 15 and 15 even when the load point F is displaced by the earthquake, the stability at the time of the earthquake can be ensured.

As described above, in the present embodiment, a plurality of seismic isolation devices 1 are arranged, and a high-rigidity top plate 29 capable of sufficiently ensuring vertical rigidity during walking is exempted via a structure 27 made of H-shaped steel 25. By installing it on the seismic device 1, the stability and vertical rigidity of the seismic isolation device 1 are reasonably ensured. Thus, it is possible to realize the seismic isolation table 10 that can secure the seismic isolation characteristics and secure the vertical rigidity.

The seismic isolation device 1 of the present invention can sufficiently secure the vertical rigidity as a single unit, and the vertical rigidity of the seismic isolation table 10 can be arbitrarily set by designing the installation floor. This makes it possible to suppress harmful walking vibrations and the like that occur when a person enters the seismic isolation table 10 by operating equipment or the like. In addition, the seismic isolation device 1 using rollers has the smallest external dimensions, and the degree of freedom in placement is high. Therefore, conditions such as the opening H for equipment depend on the type and configuration of the installed equipment. Even if they are different, the seismic isolation table 10 can be easily configured. In this embodiment, the oil damper may be attached by the same method as in Patent Document 1. Further, a connecting mechanism between the moving plates 5 may be provided to suppress the twisting deformation of the moving plates 5.

1, 1a, 1b Seismic isolation device 10, 100 Seismic isolation table 3 Lower plate 5 Moving board 7 Upper plate 9 Lower plate rail 11 Upper plate rail 13 Lower plate roller 15 Upper plate roller 17 Second lower plate rail 19 Second Upper plate rail 21 Second lower plate roller 23 Second upper plate roller 25 H-shaped steel 27 Structure made of H-shaped steel 25b H-shaped steel web 29, 29a Top plate g Axis line j1, j2 Axis-supporting end point K opening S virtual quadrangle T1, T2 triangle

Claims (5)

A seismic isolation device for reducing earthquake damage,
With the lower plate
A moving board placed on the lower plate and
With an upper plate arranged on the moving board,
A pair of lower plate rails extending in the Y direction are provided on the upper surface of the lower plate.
On the lower surface of the upper plate, a pair of upper plate rails extending in the X direction orthogonal to the lower plate rail are provided.
When a virtual quadrangle that is substantially square in plan view on the moving board is set on the moving board, a pair of lower plates that roll on the pair of lower plate rails that place axes at one of the opposite corners of the virtual quadrangle. A seismic isolation device provided with a plate roller and a pair of upper plate rollers that roll on the pair of upper plate rails whose axes are placed at the other opposite corners of the virtual quadrangle. The seismic isolation device according to claim 1, wherein the pair of lower plate rollers and the pair of upper plate rollers are pivotally supported by providing openings in the moving plate, and the intervals between the openings are even. A pair of second lower plate rails is provided on the outer side of the pair of lower plate rails.
A pair of second upper plate rails is provided on the outer side of the pair of upper plate rails.
A pair of second lower plate rollers that roll on the pair of second lower plate rails are provided on the outer side of each of the pair of lower plate rollers and each of the pair of upper plate rollers. ,
A pair of second upper plate rollers that roll on the pair of second upper plate rails are provided on the outer side of each of the pair of upper plate rollers and each of the pair of lower plate rollers. The seismic isolation device according to claim 1 or 2. An end point that pivotally supports at least one pair of upper plate rollers is included inside a triangle set at the midpoint of the axis of the pair of lower plate rollers and one of the pair of second lower plate rollers. And
An end point that pivotally supports at least one pair of lower plate rollers is included inside a triangle set at the midpoint of the axis of the pair of upper plate rollers and one of the pair of second upper plate rollers. The seismic isolation device according to claim 3. The plurality of seismic isolation devices according to any one of claims 1 to 4, and the seismic isolation device.
A structure made of H-shaped steel placed on the seismic isolation device and
With a top plate arranged on the structure,
At least one seismic isolation device has the pair of upper plate rails and the H-shaped steel extending in the same direction, so that the position of the web of the H-shaped steel is at the center between the pair of upper plate rails. Seismic isolation table to be placed.

Images