JPH0532505U - Seismic isolation support for light loads - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] It is interposed between the upper structure such as buildings and the lower structure such as the base, always supports the upper structure, and its interposer against earthquake motion. In the seismic isolation support device that reduces the swing of the upper structure by the swinging action of, the load bearing capacity is large,
Reduce installation costs without installing a separate damper. [Structure] The slider 3 interposed between the spherical seats 11 and 8 of the upper shoe 2 and the lower shoe 1 is a pillar body, and the upper and lower surfaces are in surface contact with the same curvature.

Description

[Detailed description of the device]

B. Purpose of the invention (1) Industrial field of application This invention is installed between an upper structure such as a building and a lower structure such as a base, always supports the upper structure, and supports it against earthquake motion. The present invention relates to a seismic isolation support device that reduces the shaking of the upper structure by the swinging action of the body, and is particularly suitable for light load seismic isolation suitable for light load structures such as wooden houses and low-rise concrete structures. Regarding support device.

(2) Conventional Technique In this type of seismic isolation support device for light load, there is known one disclosed in Japanese Patent No. 61135 which uses a sphere as an interposer. According to the known technique, a dish-shaped board having its concave spherical surface portion placed on the foundation of a building and a dish-shaped board having its concave spherical surface portion placed on the base of a building are placed downward. A structure with a sphere in between is adopted. With this configuration, when the foundation moves back and forth and left and right due to the occurrence of an earthquake, the sphere rolls between the upper and lower concave spherical parts, the sway is not transmitted to the base material, and the building remains stationary. However, it has the effect of preventing damage to the building. However, according to the known technique, the spherical body has a problem that the load supporting ability is small because the spherical body supports the building by point contact, and the performance deteriorates remarkably due to aging of the spherical surface due to aging. Furthermore, the structure of this known technology alone does not have a function of attenuating seismic energy and requires a separate damper to be installed, which causes a problem of increased installation cost.

(3) Problems to be Solved by the Invention The present invention has been made in view of the above circumstances, and in this type of light load seismic isolation support device, attention is paid to the interposer, and the load support ability is It is intended to provide a seismic isolation support device for light loads that is large and does not require a separate damper.

B. Structure of the Invention (1) Means for Solving Problems The light load seismic isolation support device of the invention adopts the following technical means (structure) to achieve the above object. That is, a lower shoe having a spherical seat that is fixed to the lower structure and is formed as a concave spherical surface upward, and an upper shoe that is fixed to the upper structure and has a spherical seat formed as a concave spherical surface downward. , And is interposed between the upper shoe and the lower shoe, the upper surface of the slip surface matches the curvature of the upper shoe spherical seat, and the lower surface of the slip surface matches the lower shoe spherical seat, It is characterized in that it comprises a slider having a substantially cylindrical shape.

(2) Action The slider makes surface contact with the upper and lower surfaces, supports the load of the superstructure in a plane, and exerts a large load supporting ability. When the substructure vibrates horizontally due to an earthquake, the slider slides between the spherical seats of the upper and lower shoes and does not follow the displacement of the substructure. This prevents the displacement of the lower shoe from being transmitted to the upper shoe. The upper and lower surfaces of the slider come into surface contact with the spherical seats of the upper and lower shoes, and the frictional resistance force exerts a damping action.

(3) Embodiment An embodiment of the seismic isolation support device for a light load of the present invention will be described with reference to the drawings. 1 to 3 show an embodiment thereof. That is, Fig. 1 shows the entire structural system to which the seismic isolation support device for light loads is applied, and Figs. 2 and 3 show the structure of the main part thereof.

In the drawing, B is a lower structure such as a base, G is an upper structure such as a building, and the present seismic isolation support device S for light load is provided between the lower structure B and the upper structure G. The upper structure G transfers the load of the upper structure G to the lower structure B and allows relative displacement in the horizontal direction between the two.

Therefore, the seismic isolation support device S for light loads has a lower shoe 1 mounted and fixed on the lower structure B, an upper shoe 2 fixed on the lower surface of the upper structure G, and the lower shoe 1 And a slider 3 interposed between the upper shoe 2.

The configuration of each unit will be described in detail below. The lower shoe 1 has a cylindrical body 5 as a base body, and is anchored by anchoring nuts 7 to anchor bolts 6 embedded in the lower structure B through anchor bolt insertion holes 1a formed at the four corners of the lower side thereof. It D is the delivery diameter of the cylindrical body 5. A lower spherical seat 8 is formed on the upper surface of the lower shoe 1. The lower spherical seat 8 has a predetermined curvature R and is upwardly formed into a concave spherical surface.

Similar to the lower shoe 1, the upper shoe 2 has a columnar body 10 as a base body, and is fixed to the upper structure G by bolt and nut fastening means through a bolt insertion hole formed on the upper side thereof. .. In the illustrated example, the diameter of the cylindrical body 10 is made equal to the diameter D of the cylindrical body 5 of the lower shoe 1, but the diameter is not limited to that. The lower surface of the upper shoe 2 is provided with an upper spherical seat 11 which has a predetermined curvature r and is formed in a downward spherical concave surface.

The slider 3 is a columnar body having a predetermined diameter and a predetermined height, a spherical surface portion 13 having the same curvature R as the spherical seat 8 of the lower shoe 1 is formed on the lower surface portion, and the upper surface portion is formed on the upper surface portion. A spherical portion 14 having the same curvature r as the spherical surface 11 of the upper shoe 2 is formed. The diameter d of the slider 3 is ensured to be large enough to support the load, but is sufficiently smaller than the delivery diameter D of the cylindrical bodies 5 and 10 of the lower shoe 1 and the upper shoe 2, A sufficient range of movement is maintained in the sliding movement of the slider 3 described later. In addition, the height of the slider 3 is such that the slider 3 is interposed at a position that forms the maximum distance between the spherical seats 8 and 11 of the lower shoe 1 and the upper shoe 2, that is, the lower shoe 1 and the upper shoe 2 are At the same phase, the distance between the centers of the spherical seats 8 and 11 is such that the lower shoe 1 and the upper shoe 2 do not contact each other.

In the above member, the lower shoe 1, the upper shoe 2, and the slider 3 withstand the load of the superstructure G, and are made of rigid bodies. Further, in the illustrated example, the curvature R of the spherical seat 8 of the lower shoe 1 and the curvature r of the spherical seat 11 of the upper shoe 2 are the same, but some difference is allowed unless there is a particular difference. Is.

The seismic isolation support device S for light loads of the embodiment thus configured operates as follows.

[0014]Always  In the normal state, the upper and lower surfaces of the slider 3 are in contact with the spherical seats 8 and 11 of the upper shoe 2 and the lower shoe 1, respectively. Located in the center. Since the load of the superstructure G is supported in a plane through the slider 3, it exerts a large load bearing ability. In this state, even if some force (for example, wind load) is applied to the upper structure G, the stable state is maintained, and the frictional resistance force due to the surface contact is also added. The superstructure G does not shake.

[0015]During an earthquake  When an excessive external force such as a horizontal seismic motion is applied to the structural system, a relative displacement is caused between the lower structure B and the upper structure G due to the horizontal vibration of the lower structure B, which in turn lowers 1 and 2 It appears as a relative displacement between and. The slider 3 is located between the lower shoe 1 and the upper shoe 2, slides along the spherical seats 8 and 11, and does not follow the relative displacement, and the displacement of the lower shoe 1 is almost fixed at a fixed position. Do not reach 2.

4 to 6 show the movements of the lower shoe 1, the upper shoe 2, and the slider 3. That is, FIG. 4 shows an initial state of horizontal vibration of the lower structure B. With the displacement of the lower shoe 1 to the left in the figure, the slider 3 is formed on the lower surface of the slider 3 on the curved surface of the spherical seat 8 of the lower shoe 1. Crawl along. Although the slider 3 is inclined due to its movement, the upper surface of the slider 3 is in contact with the spherical seat 11 of the upper shoe 2 with the same curvature, so that the upper shoe 2 does not tilt. FIG. 5 shows a state in which the lower structure B is maximally swayed, and the slider 3 is located near the right end of the spherical seat 8 of the lower shoe 1 and the left end of the spherical seat 11 of the upper shoe 2. In this state, the inclination of the slider 3 becomes large, but the upper shoe 2 never tilts due to the curvature effect of the upper shoe 2 with the spherical seat 11. When the lower structure B vibrates in the returning direction, the state shown in FIG. 6 is passed from the state shown in FIG. It should be noted that FIG. 5 shows the state of maximum amplitude, and usually the vibration is repeated before reaching this state.

In such an oscillating state, the slider 3 has the characteristic of always returning to a stable state, and the upper and lower surfaces of the slider 3 are in surface contact with the spherical seats 8 and 11. Therefore, a frictional resistance force is generated on the abutting surface, absorbs seismic motion energy, and damps vibrations. Horizontal vibration due to seismic motion occurs in any direction, and the oscillator 3 crawls along the curved surface of the spherical seat 8 in any direction, which corresponds to non-directional horizontal vibration.

As described above, according to the light load seismic isolation device S of the present embodiment, the displacement of the lower structure B is not transmitted to the upper structure G in response to the earthquake motion, and the upper structure G is always kept horizontal. At the same time, the load-carrying capacity does not change at all when stationary, and it has a restoring function and a damping function.

The present invention is not limited to the above embodiment, and various design changes can be made within the scope of the basic technical idea of the present invention. That is, the following aspects are included within the technical scope of the present invention.

C. Effect of the Invention Since the seismic isolation support device for a light load of the present invention has the above-mentioned configuration and functions, it has the following effects. Since the slider supports the upper and lower surfaces of the slider surface-wise while it is stationary or shaking, it exhibits a large load bearing capacity. In the shaking state, the upper shoe is not displaced from the lower shoe and maintains a horizontal state, so it does not damage the superstructure. The lower shoe, the slider, and the upper shoe have a restoring function that always returns to a stable state due to the curved surface effect in contact with each other, and contributes to the absorption of vibration. The surface contact action of the slider causes frictional resistance, which not only has a stopping action in a stationary state, but also has a damping effect in a vibration state, which does not require any other damper device.

[Brief description of drawings]

FIG. 1 shows the entire structural system to which the seismic isolation support device for light loads of the present invention is applied.

FIG. 2 is a vertical cross-sectional view of the main part thereof.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a diagram showing the behavior of the present apparatus.

FIG. 5 is a diagram showing the behavior of the present apparatus.

FIG. 6 is a diagram showing the behavior of the present apparatus.

[Explanation of symbols]

B ... lower structure, G ... upper structure, 1 ... lower shoe, 2 ... upper shoe, 3
... slider, 8 ... lower spherical seat, 11 ... upper spherical seat, 13,
14 ... Slip surface

Claims (1)

[Scope of utility model registration request] 1. A lower shoe having a spherical seat fixed to a lower structure and formed as a concave spherical surface upward, and a spherical seat fixed to an upper structure and formed as a concave spherical surface facing downward. Having an upper shoe, which is interposed between the upper shoe and the lower shoe, the slip surface of the upper surface thereof matches the curvature of the spherical seat of the upper shoe, and the slip surface of the lower surface thereof matches the curvature of the spherical seat of the lower shoe. A seismic isolation support device for light loads, comprising: a slider that is matched and has a substantially cylindrical shape.