JPH06288073A - Horizontal spring device for seismic isolation floor - Google Patents

Abstract

(57) [Abstract] [Purpose] In a horizontal spring device for a vibration-isolated floor, by linearizing the restoring force characteristics and giving a predetermined spring constant even with a small displacement, Even in combination, it is to provide a base isolation floor that suppresses residual displacement after an earthquake. [Structure] Two spring members 13 are arranged in parallel, and two pulley members 15 are provided in a base portion 20 in a pulling direction thereof.
A rail member that supports a wire member 14 in which the ends of the spring member 13 are connected by 15 and that is provided in the pulling direction of the spring member 13.
The movable member (16) movable on (17) is provided with a roller member (21) which is a means for supporting a transmission rod member (22) fixed to a pedestal from both sides and moving it smoothly. Further, two roller members 1 are provided respectively on the movable member 16 and the foundation so as to sandwich the wire member 14.
8 and 19 are provided as a set. [Effect] The spring characteristic of the horizontal spring device can be linearized, and even if a sliding member is used as the seismic isolation support device, the residual displacement after the earthquake can be suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal spring device for a seismic isolation floor, and particularly to a seismic isolation floor device that has a linear restoring force characteristic, is easy to install, is compact, and supports a computer or the like. Horizontal spring device for seismically isolated floor.

[0002]

2. Description of the Related Art As shown in FIG. 1, a conventional seismic isolation floor system has a seismic isolation support device 2 for horizontally moving a seismic isolation floor 9 equipped with a computer 10 and a restoring force in the horizontal direction. The seismic isolation floor device 2 is provided between the seismic isolation floor 9 and the foundation 1, which is composed of a horizontal spring device 5 for giving. Particularly, in the horizontal spring device 5, as in Japanese Patent Application No. 2-284283 (see FIG. 10), two spring members 13 are arranged in parallel, and two pulley members are arranged in the pulling direction of these spring members 13. 1
5 is provided in the base portion 1, the end portions of the spring member 13 are connected by the wire member 14, the wire member 14 is supported by the pulley member 15, and the rail member 17 is further provided in the pulling direction of the spring member 13. The movable member 16 that can move on the rail member 17 includes the transmission rod member 2 fixed to the pedestal 6.
There is provided a transmission roller member 21 which is a means for supporting 2 from both sides and moving it smoothly, and a hook member 26 for holding the wire member 14. This horizontal spring device 5
Does not need to be installed by pulling the spring member 13 in advance by the amount of allowable deformation, and therefore has a feature that the device is easy to install and is a compact device.

[0003]

However, the above-mentioned prior art has the following drawbacks. That is, the horizontal spring device described above has a so-called non-linear restoring force characteristic in which the spring constant is small when the displacement is small and approaches a predetermined spring constant (total spring constant of the spring member) as the displacement increases. There is.

This is not a problem when a roller member is used as the seismic isolation support device, but when a sliding member having friction is used, the spring constant of the horizontal spring device is small when the displacement is small, so that an earthquake is generated. Sometimes after the seismic isolation floor is activated, the residual displacement may increase.

It is an object of the present invention to provide a sliding type seismic isolation support device in a horizontal spring device for seismic isolation floors by linearizing the restoring force characteristic and providing a predetermined spring constant even when the displacement is small. Even in combination with, it is to provide a horizontal spring device for a base isolation floor that suppresses residual displacement after an earthquake.

[0006]

To achieve the above object, the present invention supports a pair of spring members, one end of which is fixed to a base portion and the other end of which is connected to each other by a wire member, and the wire member. A fixed roller member for supporting the wire member is provided at two places of the foundation, and the movable member is configured to transmit a restoring force in the horizontal direction to a pedestal supported so as to be movable in the horizontal direction. A movable roller member that supports a wire member between fixed roller members at some locations is provided on the movable member, and the fixed roller member and the movable roller member are
It is characterized in that they are arranged at positions where the distance between them is small.

For example, two spring members 13 are arranged in parallel, two pulley members 15 are provided on the base portion 1 in the pulling direction of these spring members 13, and the end portions of the spring members 13 are connected to each other by the wire member 14. , The wire member 14 is supported by the pulley member 15, and the rail member 17 is provided in the pulling direction of the spring member 13. The movable member 16 movable on the rail member 17 is fixed to the pedestal 6. A transmission roller member 21 or a sliding member, which is a means for supporting the transmission rod member 22 from both sides and smoothly moving it, is provided. Further, the movable member 1 is arranged so as to sandwich the wire member 13.
6 is a movable roller member 19, and the base 1 is a fixed roller member 1.
Two roller members 8 are provided as a set, and the movable roller member 19 and the fixed roller member 18 are arranged with a narrow interval.

[0008]

According to the above construction, when a horizontal seismic force is applied to the foundation 1, the seismic isolation floor 6 is smoothly moved horizontally by the seismic isolation support device 2 and is fixed to the base 6 of the seismic isolation floor 9. Transmission pulley member 22 supporting the transmission rod member 22
However, the movable member 16 of the horizontal spring device 5 is moved toward the rail member 17, the movable roller member 19 provided on the movable member 16 pulls the wire member 14, and the restoring force of the spring member 13 is isolated. It will be transmitted to the floor 9.
At this time, the restoring force in the moving direction of the movable member 16 of the horizontal spring device 5 becomes closer to the original restoring force of the spring member 13 as the gap between the fixed roller member 18 and the movable roller member 19 becomes narrower, and in advance. By giving the spring member 13 a tensile displacement, a predetermined spring constant can be provided even when the displacement is small. When the seismic isolation floor 9 is displaced in the direction perpendicular to the moving direction of the horizontal spring device 5,
The transmission rod member 22 fixed to the frame 6 is the transmission roller member 2
As 1 rotates, it moves smoothly together with the seismic isolation floor 9. Therefore, since the horizontal spring device 5 acts in two horizontal directions, it is arranged in two directions.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a longitudinal sectional view and a lateral sectional view of a base-isolated floor using an embodiment of the present invention, respectively.
3 and 4 are a vertical cross-sectional view and a horizontal cross-sectional view of the horizontal spring device for base isolation floor of this embodiment.

In FIGS. 1 and 2, the pedestal 6 is supported by a plurality of seismic isolation supporting devices 2, and the seismic isolation supporting device 2 has a plate member 4 arranged on the foundation portion 1 via a horizontal moving member 3. It is installed on top. The seismic isolation floor device is composed of a seismic isolation support device 2 and a horizontal spring device 5, and a seismic isolation floor 9 is a pedestal member 7 that supports a panel member 8 on which a person rides, a pedestal 6 that supports the pedestal member 7, and a seismic isolation floor device. Consists of. In addition, the computer 10 is directly mounted on the panel member 8,
Alternatively, it is mounted on the pedestal 6 via a support block. or,
As shown in FIG. 2, a plurality of horizontal spring devices 5 are provided around the pedestal 6, and in the case of FIG.
Four b are installed for each of the short side direction and the long side direction of the seismic isolation floor 9.

The horizontal spring device 5 in FIGS.
The spring members 13 of a book are arranged in parallel, and these spring members 1
The two pulley members 15 are provided in the base member 20 arranged in the base portion 1 in the pulling direction of 3, and the ends of the spring members 13 are connected by the wire member 14, and the wire member 14
Is supported by the pulley member 15. The other end of each spring member 13 is attached to the support member 11 by the support bolt 12.
Mounted on. Further, the rail member 17 is provided in parallel to the spring member 13 on the base member 20 on the side of the foundation portion 1, and the wire member 14 is sandwiched by the movable member 16 mounted on the block member 23 and moving on the rail member 17. Two sets of two movable roller members 19 arranged are provided, and two sets of fixed roller members 18 are sandwiched between the movable roller members 19 so that the wire member 14 is sandwiched therebetween. It is provided on the member 20. Furthermore, the movable member 16 is provided with a transmission roller member 21 that supports the transmission rod member 22 fixed to the gantry 6 from both sides and that can smoothly move the transmission rod member 22 in the vertical direction within the plane of the drawing. .

Next, the operation of this embodiment will be described.
In FIG. 2, when a horizontal earthquake motion in the plane of the drawing is applied from the foundation part 1, the pedestal 6 is moved horizontally by the horizontal movement member 3 of the seismic isolation support device 2.
(See FIG. 1) moves the plate member 4 in the left-right direction. At this time, in FIG. 3, the horizontal spring device 5a
The movable member 1 via the transmission roller member 21 (see FIG. 2).
6 is moved on the rail member 17 in the left-right direction on the paper surface by the transmission rod member 22 fixed to the pedestal 6. Along with this movement, the movable roller member 19 provided on the movable member 16 pulls the wire member 14, and the wire member 14 pulls the spring member 13 whose other end is fixed to the support member 11 by the support bolt 12. .

In FIG. 5, the wire member 14 is a movable roller member 1.
9 shows a conceptual diagram of the situation of being pulled. The spring constant Kx of the present horizontal spring device is calculated based on the conceptual diagram of the operation of the present horizontal spring device shown in FIG. 5. Kx = 2Fx / X = 2K {Lo (1 / sin θ−1) + Yo} cos θ / X (1) where θ = tan- ¹ (Lo / X): angle between wire member and x-axis X: displacement of movable roller member in moving direction Yo: initial displacement of spring member in tensile direction Lo: fixed roller member And the distance between the movable roller member and K: The spring constant of the spring member.

FIG. 6 shows the influence of Lo and Yo in the equation (1) on the spring constant Kx of the horizontal spring device of the present invention. From this figure, when Lo and Yo are equal (Lo
= Yo = A), the spring constant K does not depend on the displacement and becomes constant, and it can be seen that the spring characteristics of the horizontal spring device are linearized. Next, when Lo is increased (Lo = B, Yo =
A, B> A) and the spring constant K tend to increase as the displacement increases, and become smaller as a whole as compared with the case of Lo = Yo = A. From this, on the contrary, it can be seen that reducing Lo contributes to improving the displacement dependence of the spring constant K. Also, Yo =
In the case of 0, when the displacement is small, the spring constant K becomes extremely small, and as the displacement increases, Lo = B, Y
It approaches the spring characteristic when o = A. From this, when the displacement is small, it is possible to give the initial tensile displacement Yo.
It can be seen that it greatly contributes to the linearization of the spring characteristics.

The pulley member 15 has an initial tensile displacement Yo.
It supports static loads due to. When the static load is not so large, the pulley member 15 may be omitted and the fixed roller member 18 may be used for supporting. In addition, the wire member 14
It is possible to completely prevent the wire member 14 from coming off the roller member by providing the groove on the side surface of the roller member with which the wire member contacts.

FIG. 7 shows a cross-sectional view of another embodiment of the present invention. In this embodiment, a plurality of sets of spring element members including a spring member 13, a wire member 14, a pulley member 15, a fixed roller member 18 and a movable roller member 19 are provided in FIG. 3, and according to the present embodiment. In this way, the number of horizontal spring devices required to secure the natural period of the base isolation floor can be saved.

FIG. 8 is a cross sectional view showing still another embodiment of the present invention. In this embodiment, the two spring members 13 and the wire members 14 are provided linearly and orthogonally to the rail member 17, and the end portions of the spring member 13 are provided with the support bolt 12 and the support member 11, respectively. It is fixed to the base part 1 with. In this embodiment, the spring member 1
3, it is easy to provide a plurality of sets of spring element members including the wire member 14, the fixed roller member 18, and the movable roller member 19. Moreover, since the static load due to the initial tensile displacement is supported by the two support members 11, it is not necessary to provide the pulley member 15.

FIG. 9 shows a cross-sectional view of still another embodiment of the present invention. In this embodiment, two spring members 13 are used.
a and 13b are linearly provided in parallel with the rail member 17, and the ends of the spring members 13a and 13b on the far side are supported by the support bolt 12 and the support member 11, respectively, and the end on the near side has one end. The wire member 14 is connected by the wire member 14.
Is two fixed pulley members 2 provided on the base member 20.
It is supported by a movable pulley member 25 provided on the movable member 16 and 4a, 24b. In this embodiment, the spring member 13a,
13b, a wire member 14, two sets of a fixed pulley member 24, a movable pulley member 25, and the like are further provided separately in symmetry with the rail member 17. When the pulley members are arranged in this manner, when the movable member 16 moves, the movable pulley member 25 functions as a moving pulley, so that the spring member 13 is displaced twice as much as the movable member 11, so that the horizontal spring device is provided. Has a spring constant twice as large as the total spring constant of the four used here, and the number of horizontal spring devices to be arranged on the base isolation floor can be reduced.

[0019]

According to the present invention, the spring characteristic of the horizontal spring device can be linearized, and the residual displacement after the earthquake can be suppressed even if the sliding member is used as the seismic isolation support device.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a base isolation floor to which a horizontal spring device of the present invention is applied.

FIG. 2 is a cross-sectional view of a base isolation floor to which the horizontal spring device of the present invention is applied.

FIG. 3 is a cross-sectional view showing an embodiment of the present invention.

FIG. 4 is a vertical sectional view showing an embodiment of the present invention.

FIG. 5 is a conceptual diagram of the operating principle of the horizontal spring device.

FIG. 6 is a diagram showing an example of spring characteristics of the present invention.

FIG. 7 is a cross-sectional view of another embodiment of the present invention.

FIG. 8 is a cross-sectional view of yet another embodiment of the present invention.

FIG. 9 is a cross-sectional view of yet another embodiment of the present invention.

FIG. 10 is a cross-sectional view of a conventional horizontal spring device.

[Explanation of symbols]

 1 foundation part 2 seismic isolation support device 3 horizontal movement member 4 plate member 5 horizontal spring device 6 frame 7 pedestal member 8 panel member 9 seismic isolation floor 10 computer 11 support member 12 support bolt 13 spring member 14 wire member 15 pulley member 16 movable Member 17 Rail member 18 Fixed roller member 19 Movable roller member 20 Base member 21 Transmission roller member 22 Transmission rod member 23 Block member 24 Fixed pulley member 25 Movable pulley member 26 Hook member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ikushi Otake 502 Jinritsucho, Tsuchiura-shi, Ibaraki Machinery Research Institute, Hiritsu Manufacturing Co., Ltd. (72) Inventor Akihiko Shiozawa 3-1-1, Saiwaicho, Hitachi, Ibaraki Stock company Hitachi Ltd.Hitachi factory

Claims (9)

[Claims] 1. A pair of spring members, one end of which is fixed to a base portion and the other end of which is connected to each other by a wire member, and a pedestal that supports the wire member and is horizontally movably supported by the base portion. A movable roller member for transmitting a restoring force in the horizontal direction, a fixed roller member for supporting the wire member provided at two points of the base, and a movable roller member for supporting the wire member between the two fixed roller members. Is provided on the movable member, and the fixed roller member and the movable roller member are arranged at positions where a distance between them is small. 2. A horizontal spring device for a base isolation floor, which applies a restoring force by a spring member to a frame supported by a base isolation support device having a plurality of horizontal moving members movable in a horizontal plane on a foundation, One end is fixed to a support member provided on the base part, and the other end is provided so as to be movable on two spring members connected to each other by a wire member and a rail member installed on the base part. A movable member that supports the member and transmits a restoring force in the horizontal direction to the gantry.
The two spring members are arranged in parallel with the rail member, the base portion is provided with two pulley members for supporting the wire members in the pulling direction of the spring members, and the wire members are sandwiched therebetween. Two pairs of fixed roller members to be supported are provided one on each side of the movable member with the rail member interposed therebetween, and the movable member has the wire at a position close to the fixed roller member. One set or two sets of two movable roller members that support the members so as to be sandwiched are provided, and two sets of the transmission roller members are provided so as to support the transmission rod members fixed to the mount from both sides. A horizontal spring device for seismic isolation floors characterized by being provided. 3. The horizontal spring device for a base isolation floor according to claim 2, wherein the spring element member includes the two spring members, a wire member, two pulley members, a movable roller member and a fixed roller member. A horizontal spring device for seismic isolation floors, which is characterized by having a plurality of sets. 4. A horizontal spring device for a base isolation floor, which applies a restoring force by a spring member to a stand supported by a base isolation support device having a plurality of horizontal moving members movable in a horizontal plane on a foundation, One end is fixed to a support member provided on the base part, and the other end is provided so as to be movable on two spring members connected to each other by a wire member and a rail member installed on the base part. A movable member that supports the member and transmits a restoring force in the horizontal direction to the gantry.
The two spring members are arranged in parallel to the rail member, and the base member is provided with a pair of fixed roller members for supporting the wire member so as to sandwich the wire member in the pulling direction of the spring member. One pair of movable roller members is provided on both sides of the movable member so as to sandwich the movable member, and a pair of movable roller members for supporting the wire member so as to sandwich the wire member is provided in the movable member at a position close to the fixed roller member. A horizontal spring device for a seismic isolated floor, wherein one set or two sets are provided, and two sets of transmission roller members are provided so as to support the transmission rod members fixed to the mount from both sides. 5. A horizontal spring device for a base isolation floor, which applies a restoring force by a spring member to a pedestal supported by a base isolation supporting device having a plurality of horizontal moving members movable in a horizontal plane on a foundation, One end is fixed to a support member provided on the base part, and the other end is provided so as to be movable on two spring members connected to each other by a wire member and a rail member installed on the base part. A movable member that supports the member and transmits a restoring force in the horizontal direction to the gantry.
A set of two spring members and the wire member are provided linearly and orthogonal to the rail member, and are supported by the base portion so as to sandwich the wire member in the pulling direction of the spring member. One set of fixed roller members is provided on both sides of the movable member with the rail member sandwiched therebetween, and the movable member is supported so as to sandwich the wire member at a position close to the fixed roller member. One or two sets of two movable roller members are provided, and two sets of movable roller members are supported so that the transmission rod members fixed to the pedestal are supported from both sides.
A horizontal spring device for seismic isolation floors, characterized in that a set of transmission roller members is provided. 6. The horizontal spring device for a base isolation floor according to claim 4 or 5, wherein a plurality of sets of spring element members including the two spring members, a wire member, a movable roller member, and a fixed roller member are provided. A horizontal spring device for seismically isolated floors. 7. A horizontal spring device for a base isolation floor, which applies a restoring force by a spring member to a pedestal supported by a base isolation supporting device having a plurality of horizontal moving members movable in a horizontal plane on a foundation, One end is fixed to a support member provided on the base part, and the other end is provided so as to be movable on two spring members connected to each other by a wire member and a rail member installed on the base part. A movable member that supports the member and transmits a restoring force in the horizontal direction to the gantry.
A plurality of spring members that are linear and are provided in parallel with the rail member, two fixed pulley members that support the wire member are provided on the base portion, and the two fixed pulley members are provided on the movable member. 2. A horizontal spring device for a seismic isolated floor, characterized in that a movable pulley member for supporting a wire member between these two fixed pulleys is provided at a position where the space between the two is small. 8. A horizontal spring device for a base isolation floor, which applies a restoring force by a spring member to a pedestal supported by a base isolation supporting device having a plurality of horizontal moving members movable in a horizontal plane on a foundation, One end is fixed to a support member provided on the base part, and the other end is provided so as to be movable on two spring members connected to each other by a wire member and a rail member installed on the base part. A movable member that supports the member and transmits a restoring force in the horizontal direction to the gantry.
A plurality of spring members that are linear and are provided in parallel with the rail member, two fixed pulley members that support the wire member are provided on the base portion, and the two fixed pulley members are provided on the movable member. A movable pulley member that supports a wire member between these two fixed pulleys is provided at a position where the space between the two fixed pulleys is small, and is composed of these two spring members, a wire member, two fixed pulley members and a movable pulley member, and the like. A horizontal spring device for a base isolation floor, wherein spring element members are provided symmetrically on both sides of the rail member. 9. The horizontal spring device for seismic isolation floor according to claim 1, wherein a fixed roller or a fixed pulley member provided on the base portion and a movable roller or a movable member provided on the movable member. A horizontal spring device for a seismic isolated floor, characterized in that the distance from the pulley member is equal to the initial displacement in the pulling direction given to the spring member.