JP2002250395A - Spherical bearing unit and spherical base isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spherical bearing unit and a spherical base isolation device capable of naturally transmitting a support load thanks to the reduction of a frictional force by constituting a spherical rolling body in a state of a line contact, and also capable of responding to pull-out resistance. SOLUTION: This spherical bearing unit 1 comprises: a lower side member 2 formed such that a plurality of circular grooves arranged vertically are arranged side by side on an upper surface, and side parts formed into Ushapes and forming a plurality of circular grooves on upper and lower surfaces of an end is made to face to each other; an upper side member 3 constituted such that a plurality of circular grooves disposed between the U-shaped side parts facing each other and arranged vertically are disposed side by side on a lower surface, and a plurality of circular grooves are formed on upper and lower surfaces of an end; a spherical body 4 fitted between the circular groove arranged on the upper surface of the lower side member and the circular groove arranged on the lower surface of the upper side member; and the spherical body 4 fitted between the plural circular grooves formed on the upper and lower surfaces of the upper side member and the plural circular grooves formed on the end at the U-shaped side part of the lower side member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spherical bearing unit and a spherical seismic isolator, and more particularly to a spherical bearing unit and a spherical seismic isolator suitable for structures having a low aspect ratio and a long natural period.

[0002]

2. Description of the Related Art A conventional seismic isolation device has a load supporting function and a restoring force function in which a steel plate having a concave curved surface is vertically opposed to each other, and one relatively large bearing ball is interposed therebetween. What to show at the same time (Tokuhei 5-14062)
In order to improve the limit value of the small supporting load caused by the point contact between the concave curved surface and one bearing ball, which is a problem of this, the rolling surface and the rolling of the bearing ball are improved. A seismic isolation device (Japanese Unexamined Patent Publication No. Hei 8-53953) that expects a large load by forming a line contact that increases the contact area with a moving object solves the problem of positioning after an earthquake and the building moving with strong wind pressure. It is disclosed in combination with a laminated rubber.

Further, by making the contact area between the rolling surface and the rolling element a linear contact, the frictional force is reduced and the supporting load is transmitted without difficulty, and at the same time, the rolling surface is formed into a concave curved surface and the restoring force is also added to the laminated rubber. Seismic isolation bearing without using
No. 351319) is also introduced.

However, in these seismic isolation bearings, almost no consideration is given to the pull-out strength, so if the necessity of high-rise buildings has recently increased, high-rise buildings with a poor aspect ratio will be required. It is expected to provide seismic isolation devices that can withstand pulling out while sliding as required.

[0005]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned situation, and a rolling element of a spherical body is formed in line contact so that a supporting load can be easily reduced by reducing a local stress of a contact portion. We provide a spherical bearing unit and a spherical seismic isolation device that can also handle pull-out strength while transmitting.

[0006]

A spherical bearing unit according to the present invention has a plurality of circular grooves arranged in parallel on the upper surface, formed in a U-shape, and formed with a plurality of circular grooves on upper and lower end surfaces. A plurality of circular grooves arranged in parallel in a row are arranged between the lower member formed with the side portions forming the base member facing each other and the U-shaped side portion facing the lower member, and are arranged in parallel with the lower member. And an upper member that forms a plurality of circular grooves on the upper and lower surfaces of the end portion, and is fitted between a circular groove arranged on the upper surface of the lower member and a circular groove disposed on the lower surface of the upper member. It is composed of a sphere fitted between a plurality of circular grooves formed on the upper and lower surfaces of the end of the sphere and the upper member and a plurality of circular grooves formed on the ends of the U-shaped side of the lower member. , By fitting a plurality of spheres into a circular groove to form a line contact state for vertical load, A circular groove and which in mated spherical end engaged with each other a lower member and the upper member by the angular contact with is the possible responses to pullout force.

[0007] The sphere seismic isolation device according to the present invention is constructed by vertically arranging the sphere bearing units vertically.
A load supporting function and a pull-out strength function are established to be movable in all directions to prevent the support object from rotating in a plane.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A sphere support unit according to the present invention comprises a lower member, an upper member, and a plurality of spheres fitted between the lower member and the lower member. A plurality of circular grooves are arranged in parallel, and a plurality of circular grooves are formed on upper and lower surfaces of end portions of the side portions, with side portions formed in a U-shape facing each other. A plurality of circular grooves arranged in tandem in opposition to the member are arranged in parallel on the lower surface, and a plurality of circular grooves are formed on the upper and lower end surfaces, so that the lower member has a U-shaped side facing It is located between the parts.

The sphere supporting the vertical load is fitted in a line contact state between a circular groove arranged on the upper surface of the lower member and a circular groove arranged on the lower surface of the upper member, and has an angular contact. The sphere to be formed is configured to be fitted between a plurality of circular grooves formed on the upper and lower surfaces of the end of the upper member and a plurality of circular grooves formed on the ends of the U-shaped side of the lower member. I have.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view of a spherical bearing unit according to the present invention. In the figure, the sphere support unit 1 is composed of a lower member 2 and an upper member 3, and a plurality of spheres 4 are fitted between the lower member 2 and the upper member 3.

The lower member 2 is disposed in such a manner that sides 5, 5 formed in a U-shape on both sides are opposed to each other, and a plurality of lower members 2 are provided on the upper surface thereof as seen in a plan sectional view of FIG. The circular grooves 6 are arranged in tandem. The spheres 4 such as bearing balls are fitted in the circular grooves 6, and a plurality of different columns 7 and 8 arranged in a staggered state are alternately arranged to increase the arrangement density of the spheres 4. .

The outermost columns 7 ', 7' arranged at the ends of the side portions 5, 5 support the load and, at the same time, form an angular contact corresponding to the column 9 described later. Is also working.

FIG. 3 is an elevational sectional view of the sphere bearing unit 1, in which the U-shaped side portions 5 arranged on both sides of the lower member 2,
5 shows an arrangement state of vertical columns 7 'and 9 of spherical bodies which are fitted into a circular groove 6 formed at the upper and lower ends thereof to form an angular contact.

The upper member 3 is disposed between the U-shaped side portions 5 and 5 provided on both sides of the lower member 2 so as to face the lower member 2. On the lower surface of the upper member 3,
Similarly to the lower member 2, a plurality of circular grooves 6 having different numbers of circular grooves 6 are arranged in tandem and a plurality of columns 7 arranged in a staggered state.
8 are alternately arranged.

On the upper and lower surfaces at both ends of the upper member 3,
The plurality of circular grooves 6 are arranged in a cascade, and the spheres 4 such as bearing balls are fitted therein. The cascades 7 'and 9 of the spheres are arranged to form an angular contact state.

The mounting plates 10 and 10 are provided on the lower member 2 and the upper member 3, and are configured as mounting members when the spherical bearing unit 1 is configured as a seismic isolation device.

Since the sphere support unit according to the present invention is configured as described above, a plurality of spheres are fitted into the circular groove to form a line contact state with respect to a vertical load, thereby forming a local contact portion. In addition to reducing the stress and frictional resistance, the load is smoothly transmitted, and the lower member and the upper member are mutually connected by making the circular grooves at each end and the sphere fitted therein into an angular contact. Engagement makes it possible to cope with a pulling force.

FIG. 4 shows a spherical seismic isolator according to the present invention constituted by using the above-mentioned spherical bearing unit. FIG. 4 shows a side view (a) and a partially cut-away plan view (b). The form is shown.

In the present embodiment, as shown in the side view (a), two spherical bearing units 1 and 1 are juxtaposed between an upper mounting plate 11 and an intermediate plate 12 so as to be used when an earthquake occurs. The spherical support unit 1 arranged on the upper side between the intermediate plate 12 and the lower mounting plate 13,
The lower spherical support units 1 and 1 are similarly juxtaposed in a direction orthogonal to 1.

Thus, the spherical bearing units 1, 1
Can move in response to vibration in a direction intersecting with the upper side because it is arranged and arranged in an orthogonal state as shown in the plan view (b). Spherical bearing units arranged above and below can sufficiently cope with vibrations in any direction that deviate by sharing component forces in the respective directions with each other.

FIG. 5 shows another embodiment of the spherical seismic isolation device according to the present invention, which does not constitute a spherical bearing unit but forms an integrated spherical seismic isolation device.

FIG. 5A is a perspective view of the present embodiment in which the upper mounting member is removed, and the sphere seismic isolator 20 of the present embodiment constitutes a spherical support 21 on the upper side. The lower member 23 and the upper member 24 constituting the lower spherical support 22 are machined as a cross-shaped integral member.

The lower member 23 constituting the upper spherical bearing 21 has an upper member 25 disposed between both side parts 26, 26, and the upper member 25 constituting the lower spherical bearing 22. Numeral 24 is arranged between both side portions 28 of the lower member 27 which is arranged crossing.

FIG. 5 which is a view (b)-(b) of FIG.
As shown in the vertical sectional view of (b), each lower member 2
Between the upper surfaces of the upper and lower members 24 and 25
The circular grooves 6 of different numbers into which the spheres 4 are fitted are arranged in tandem, and a plurality of columns 7, 8 arranged in a staggered manner are alternately arranged.

Similarly, a plurality of circular grooves 6 are arranged in tandem on the upper and lower surfaces of both ends of the upper members 24 and 25, and a sphere 4 such as a bearing ball is fitted therein. As in the embodiment described above, the spherical columns 7 'and 9 are arranged to form an angular contact state.

The mounting plates 29, 29 are
5 and the lower member 27, and is configured as a mounting member when the spherical bearing unit 1 is configured as a seismic isolation device.

Since the spherical seismic isolation device of the present embodiment is configured as described above, each of the upper member and the lower member is integrally processed, and a compact structure is obtained by combining these members. Can be.

As described above, the sphere seismic isolation device according to the present invention is constructed by vertically arranging the sphere bearing units so as to establish a load supporting function and a pull-out resistance function and to move in all directions. It can be formed freely.

FIG. 6 is a schematic view showing an embodiment in which a spherical seismic isolation device according to the present invention is mounted on a structure.

In the figure, reference numeral 30 denotes a high-rise building;
Reference numeral 1 denotes a support such as the ground. Numeral 32 is an elastic member made of laminated rubber and arranged at both ends thereof between the high-rise building 30 and the support 31.
When it is displaced with respect to, it acts to give a horizontal restoring force. The spherical seismic isolation device 33 supports the high-rise building 30 and transmits the load to the support body 31. Even when an earthquake occurs, the high-rise building 30 can slide smoothly in the horizontal direction, and the vibration is reduced. Upon completion, the elastic member 32 promptly restores the original position.

Further, since the spherical isolator according to the present invention forms the angular contact as described above, it can function effectively even when applied to a structure having a low aspect ratio and a long natural period. it can.

Although the present invention has been described in detail with reference to the embodiment, the sphere bearing unit and the sphere seismic isolation device according to the present invention are not limited to the above embodiment, and the size of the sphere It is a matter of course that various changes can be made to the number of sheaths and the materials thereof without departing from the spirit of the present invention.

[0034]

In the spherical bearing unit according to the present invention, a plurality of ball receiving depressions arranged in tandem on the upper surface are arranged in parallel, are formed in a U shape, and a plurality of circular grooves are formed on upper and lower end surfaces. A plurality of circular grooves arranged between the lower member formed with the side portions facing each other and the U-shaped side portions facing each other and arranged in tandem with the lower member are arranged in parallel on the lower surface. An upper member forming a plurality of circular grooves on the upper and lower surfaces of the end portion, a sphere and an upper member fitted between the circular grooves arranged on the upper surface of the lower member and the circular grooves arranged on the lower surface of the upper member Since it is composed of a sphere fitted between a plurality of circular grooves formed on the upper and lower surfaces of the end of the member and a plurality of circular grooves formed on the end of the U-shaped side of the lower member, By fitting the spheres into circular grooves, a line contact state is formed for vertical load, and each end It is effective to also cope with pullout force the mated sphere and to the circular groove engage with each other a lower member and the upper member by the angular contact of.

The sphere seismic isolation device according to the present invention is constructed by vertically arranging the above-mentioned sphere bearing units at right angles to each other, so that a load supporting function and a pull-out resistance function are established and the sphere supporting unit is formed so as to be movable in all directions. Has the effect of doing.

[Brief description of the drawings]

FIG. 1 is a perspective view of a spherical bearing unit according to the present invention.

FIG. 2 is a plan cross-sectional view of the spherical bearing unit according to the present invention, taken along the line (2)-(2) in FIG. 1;

FIG. 3 is an elevational sectional view of the spherical bearing unit according to the present invention, taken along the line (3)-(3) in FIG. 1;

FIG. 4 is a schematic diagram of a spherical seismic isolation device according to the present invention.

FIG. 5 is a diagram of another embodiment of a spherical seismic isolation device according to the present invention.

FIG. 6 is a schematic view of an embodiment in which a spherical seismic isolation device according to the present invention is mounted on a structure.

[Explanation of symbols]

1 spherical support unit, 2 lower member, 3 upper member, 4 sphere, 5 side, 6 circular groove, 7, 8,
9 columns, 7 'outermost column, 10 mounting plate, 1
1 upper mounting plate, 12 intermediate plate, 13 upper mounting plate, 20 spherical seismic isolation device, 21, 22 spherical bearing,
23, 27 Lower member, 24, 25 Upper member, 2
6, 28 both sides, 29 mounting plate, 30 high-rise building, 31 support, 32 elastic member, 33 spherical seismic isolation device,

Claims (2)

[Claims] 1. A plurality of circular grooves arranged in tandem on an upper surface are arranged in parallel, are formed in a U-shape, and are formed by facing side portions forming a plurality of circular grooves on upper and lower end surfaces. Side members,
A plurality of circular grooves arranged between the opposed U-shaped side portions and arranged in tandem with the lower member are arranged in parallel on the lower surface, and a plurality of circular grooves are formed on the upper and lower surfaces of the end. An upper member, a sphere fitted between circular grooves arranged on the upper surface of the lower member and a circular groove arranged on the lower surface of the upper member, and a plurality of circular grooves formed on the upper and lower surfaces of the end of the upper member A sphere support unit comprising a sphere fitted between the lower member and a plurality of circular grooves formed at an end of the U-shaped side portion of the lower member. 2. A sphere seismic isolation device comprising the sphere bearing units according to claim 1 arranged vertically and vertically.