JP2001074097A - Earthquake force absorbing device in base isolation structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an earthquake force absorbing device most suitable for an article to be base-isolated which is light in weight. SOLUTION: This earthquake force absorbing device is furnished with a base plate 2 fixed on the foundation, a support plate 5 supporting an article to be base-isolated, a first guide plate 3 to move in the X axial direction, a second guide plate 4 to move in the Y axial direction orthogonal with an X axis and fixed on the first guide plate 3, a first guide track 11 provided on the first guide plate 3 in the diagonal direction against the Y axis, a first pressing means 13 to be supported by the base plate 2 and to be pressed by the first guide track 11 and a second pressing means 14 supported by the support plate and to be pressed by the second guide track 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for absorbing seismic force of a base-isolated structure which prevents vibration during an earthquake from being transmitted to a base-isolated object such as equipment.

[0002]

2. Description of the Related Art Many seismic force absorbing devices for seismic isolation structures have been developed for heavy seismic isolated objects such as buildings, and for lightly seismic isolated objects such as arts and crafts. The equipment is currently in a small state.

By the way, when a seismic absorption device for a heavy seismic isolated object is used as it is for a light seismic isolated object, (1) the conventional seismic absorption device is large and lightweight. It is unsuitable for installing a seismic isolated object alone. (2) No measures are taken to prevent falling or locking of the seismic isolated object. (3) Since a rotational motion occurs during an earthquake, long There were problems such as being unsuitable for seismic isolation.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to solve such a problem and to provide a seismic force absorbing device for a base-isolated structure suitable for a light-weight seismic-isolated object. is there.

[0005]

According to a first aspect of the present invention, there is provided a substrate fixed to a foundation, a support plate for supporting an object to be seismically isolated,
A first guide plate moving in the axial direction, a second guide plate moving in the Y-axis direction perpendicular to the X-axis and fixed to the first guide plate, and the second guide plate moving obliquely to the X-axis. A first guide track provided on the first guide plate, a second guide track provided on the second guide plate obliquely with respect to the Y axis, and the first guide track supported by the substrate. Characterized by comprising: a first pressing means pressed against the support member; and a second pressing means supported by the support plate and pressed against the second guide track. The vibration displacement is restored by a first pressing means pressed against a first guide track and a second pressing means pressed against the second guide track in a direction orthogonal to the first guide track. , Vibration is absorbed.

According to a second aspect of the present invention, the angle of the first guide track and / or the second guide track in the oblique direction with respect to the X axis and / or the Y axis is sequentially changed. The present invention relates to the seismic force absorbing device for a base-isolated structure described in 1, wherein the restoring force changes according to the magnitude of the vibration.

According to a third aspect of the present invention, the first pressing means and / or
Alternatively, the second pressing means includes a guide track and / or a rolling element that rolls with respect to the second guide track, The seismic force absorbing device for a base-isolated structure according to claim 1, wherein With this, the restoration of the vibration displacement becomes smooth.

According to a fourth aspect of the present invention, the first pressing means and / or
Alternatively, the second pressing means includes a guide track and / or a sliding member that slides on the second guide track. In such a case, the restoring force can be changed by selecting a sliding material.

According to a fifth aspect of the present invention, the first pressing means and / or
Alternatively, the second pressing means is provided with a pressing force adjusting means, wherein the seismic force absorbing device for a seismic isolation structure according to claim 1, wherein the restoring force can be arbitrarily adjusted. Will be possible.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 is a front view of an example of the embodiment of the present invention. A flat substrate 2 is horizontally fixed on a base 1, and a first substrate 2 is provided above the substrate 2 at intervals.
The guide plate 3, the second guide plate 4, and the support plate 5 are sequentially arranged horizontally. On the upper surface of the support plate 5, an unillustrated device or a seismically isolated object such as art and craft is placed.

FIG. 2 is a cross-sectional plan view taken along the line II-II of FIG. 3, and an X-axis direction guide rail 6 extending linearly in the left-right direction of FIGS. And
A guide block 7 such as a bearing guided by an X-axis direction guide rail 6 is fixed to the lower surface of the first guide plate 3. Can be moved linearly only in the horizontal direction.

FIG. 1 is a cross-sectional plan view taken along the line II of FIG. 3, and FIG. 4 is a perspective view of an example of an embodiment of the first guide plate 3 and the second guide plate 4. A guide block 8 such as a bearing is fixed on the upper surface of the second guide plate 4 disposed above the lower surface of the support plate 5 as shown in FIGS. , And is guided by a Y-axis guide rail 9 extending linearly in a direction orthogonal to the X-axis guide rail 6. For this reason, the support plate 5 is vertically moved with respect to the second guide plate 4 in FIG.
It can move linearly only in the direction perpendicular to the plane of FIG.

The above-mentioned first guide plate 3 and second guide plate 4
Are integrally connected by a fixed rod 10 as shown in FIGS. On the side surface of the first guide plate 3 in the X-axis direction, there is provided a first guide track 11 in which the central portion is the most depressed and both sides thereof are oblique to the X-axis and shallow, and On the side surface of the guide plate 4 in the Y-axis direction, there is provided a second guide track 12 whose central portion is the most depressed and whose both sides are oblique to the Y-axis and become shallow, as will be described next. The first pressing means 13 presses the first guide track 11 and the second pressing means 14 presses the second guide path 12.

The first pressing means 13 is, as shown in FIG.
A bearing 15 fixed to the upper surface of the substrate 2, and a shaft 16 supported by the bearing 15 and moving back and forth toward the first guide track 11
A rolling element 17 such as a roller rotatably attached to the tip of a shaft 16, and a rolling element 17 connected to the first guide track 11.
And a pressing spring 18 that presses the pressing spring 18.

The second pressing means 14 is, as shown in FIGS. 1 and 3, a bearing 19 fixed to the lower surface of the support plate 5, and is supported by the bearing 19 toward the second guide track 12 in FIG. It comprises a shaft 20 that moves forward and backward, a rolling element 21 such as a roller that is rotatably attached to the tip of the shaft 20, and a pressing spring 22 that presses the rolling element 21 against the second guide track 12.

Next, the operation of the apparatus shown in FIGS. 2 to 4 will be described. The load of a not-shown seismic object placed on the upper surface of the support plate 5 in FIG. 3 is applied to the support plate 5, the Y-axis direction guide rail 9, the guide block 8, the second guide plate 4, the fixed rod 10, A load is applied to the foundation 1 via the first guide plate 3, the guide block 7, the X-axis direction guide rail 6, and the board 2.

When the substrate 2 vibrates in the X-axis direction together with the foundation 1, the guide block 7, the first guide plate 3, the fixed rod 10, the second guide plate 4, the guide block 8, the Y-axis guide rail 9, and the support The plate 5 moves along the X-axis direction guide rail 6. Therefore, X of the first guide plate 3 shown in FIG.
The first guide track 11 is displaced in the X-axis direction with respect to the rolling element 17 pressing the first guide track 11 on the axial side surface, and the pressing spring 18 is compressed so that the first rolling element 17 of the rolling element 17 is compressed. The pressing force on the guide track 11 increases in proportion to the amount of displacement of the guide track 11 in the X-axis direction. As a result, a restoring force is applied to the first guide plate 3 so as to return to the original position in the X-axis direction. Guide plate 3, fixed rod 10, second
Guide plate 4, guide block 8, Y-axis direction guide rail 9,
The vibration of the support plate 5 in the X-axis direction is reduced.

When the substrate 2 vibrates in the Y-axis direction together with the foundation 1, the support plate 5 is moved to the Y-axis direction guide rail 9 and the guide block 8
, And moves along the Y-axis direction guide rail 9. For this reason, the second guide track 12 is displaced in the Y-axis direction with respect to the rolling element 21 pressing the second guide track 12 on the side surface in the Y-axis direction of the second guide plate 4 shown in FIG.
The pressing spring 22 is compressed, and the pressing force of the rolling element 21 against the second guide track 12 increases in proportion to the amount of displacement of the second guide track 12 in the Y-axis direction. Thereby, the second guide plate 4
, A restoring force acting to return to the original position in the Y-axis direction is applied.
By moving in the axial direction, the vibration of the support plate 5 and the Y-axis direction guide rail 9 in the Y-axis direction is reduced.

Thus, even if the foundation 1 vibrates in any horizontal direction, the horizontal vibration with respect to the support plate 5 is reduced and attenuated. As shown in FIG. 1, the first guide track 11 and the second guide track 12 provided on the first guide plate 3 and the second guide plate 4 have a constant inclination toward both sides from the center which is most depressed as shown in FIG. In addition to the shallow shape, as shown in FIG. 5, the shape should be shallower toward both sides in an arc shape from the center of the most depressed portion, so that the X axis and the oblique angle to the X axis gradually increase from 0 degrees. Alternatively, as shown in FIG. 6, it is also possible to adopt a shape in which the oblique angle increases stepwise toward both sides in a polygonal line shape from the center of the most depressed portion and becomes shallower.

In the case of FIG. 5, the restoring force increases at a higher rate than the case of FIG. 1 as the displacement amount of the first guide plate 3 and the second guide plate 4 increases, and in the case of FIG. First, the restoring force gradually increases as the displacement increases.

FIG. 7 is a plan view of another example of the embodiment of the first pressing means 13 and the second pressing means 14, which are directed toward the first guide track 11 and the second guide track 12. The sliding member 23 is attached to the tip of the shafts 16 and 20 which move forward and backward,
3 is pressed against a first guide track 11 and a second guide track 12.

When the first pressing means 13 and the second pressing means 14 shown in FIG. 7 are used, the distance between the first guide track 11 and the second guide track 12 depends on the material of the sliding member 23. Since the frictional force changes, the restoring force in the X-axis direction and the Y-axis direction can be changed by selecting the type of the sliding member 23.

FIG. 8 is a plan view of still another example of the embodiment of the first pressing means 13 and the second pressing means 14, which are directed toward the first guide track 11 and the second guide track 12. The pressing spring support plate 24 is slidably fitted to the shafts 16 and 20 which move forward and backward to support the proximal ends of the pressing springs 18 and 22, and the bearing 1
An adjusting screw 25 is screwed into each of 5, 5 and 19, and its tip is brought into contact with the surface of the pressing spring support plate 24 on the side opposite to the pressing springs 18 and 22.

In the embodiment shown in FIG. 8, the pressing spring support plate 2
4. The adjusting screw 25 constitutes the pressing force adjusting means. The adjusting screw 25 is turned to move the pressing spring support plate 24 forward and backward, and the compression state of the pressing springs 18, 22 is changed to change the rolling elements 17,
By adjusting the pressing force of the first 21 against the first guide track 11 and the second guide track 12, the restoring force of the first guide plate 3 and the second guide plate 4 can be changed. In addition, also in the embodiment of FIG.
A sliding member 23 as shown in FIG.

FIG. 9 is a plan view of still another example of the embodiment of the first pressing means 13 and the second pressing means 14, which are directed toward the first guide track 11 and the second guide track 12. The block 26 is fitted to the rear ends of the shafts 16 and 20 which advance and retreat.
Alternatively, a tension spring 28 is stretched between the tension spring support pin 27 attached to the support plate 5 (see FIGS. 1 and 3) and the block 26, and an adjusting screw 29 is screwed into the block 26, and the tip thereof is connected. The shafts 16 and 20 are in contact with the rear ends.

In the embodiment shown in FIG. 9, the pressing force is generated by using a tension spring 28 instead of the pressing spring, and the block 26 and the adjusting screw 29 constitute the pressing force adjusting means. By turning the block 26 forward and backward, the tension of the tension spring 28 is changed to adjust the pressing force of the rolling elements 17 and 21 against the first guide track 11 and the second guide track 12, and the first guide plate 3 The restoring force of the second guide plate 4 can be changed. In the embodiment shown in FIG. 9, the rolling elements 1
A sliding member 23 as shown in FIG.

FIG. 10 is a plan view of another example of the embodiment of the guide plate, in which the first guide track 11 is provided only on one side surface of the first guide plate 3 in the X-axis direction, and The first guide track 11 is pressed by the first pressing means 13 provided on the upper surface of the second guide plate 2, and an X-axis guide rail 30 is fixed to the other side surface of the first guide plate 3 in the X-axis direction. A guide block 31 fixed to the upper surface of the second base 2 is fitted to the X-axis direction guide rail 30 so that the first guide plate 3 can be moved linearly only in the X-axis direction with respect to the substrate 2.

Then, an intermediate plate 32 is arranged above the substrate 2, and the first guide plate 3 is fixed to the lower surface of the intermediate plate 32 by the fixing rod 10. On the upper surface of the intermediate plate 32, the second guide track 12 is provided only on one side surface in the Y-axis direction so as to correspond to the shape of the first guide plate 3 in FIG.
(See FIG. 1), and a second guide plate to which a Y-axis direction guide rail is fixed is fixed to the other side surface in the Y-axis direction. The second guide plate can be moved linearly only in the Y-axis direction by a guide block fixed to the lower surface of the support plate 5 (see FIG. 3). The same operation as that of 1 can be performed.

In the embodiment shown in FIG.
As shown in FIG. 6, the first guide track 11 and the second guide track 12
Can be made into an arc shape or a broken line shape, or a sliding member 23 can be used for the first pressing means 13 and the second pressing means 14 as shown in FIG.

[0030]

According to the first aspect of the present invention, the vibration of the earthquake can be absorbed and attenuated by a compact device which depends on the pressing force of the pressing means without depending on the weight of the seismic isolated object.

According to the second aspect of the present invention, since the magnitude of the restoring force changes according to the magnitude of the vibration, there is an effect that the restoration and the damping can be performed adaptively to the vibration. The invention according to claim 3 has an effect that the vibration displacement can be smoothly restored by the rolling elements.

The invention of claim 4 has an effect that the restoring force can be changed by selecting a sliding material. The invention of claim 5 has an effect that the restoring force can be arbitrarily adjusted.

[Brief description of the drawings]

FIG. 1 is a cross-sectional plan view taken along a line II of FIG. 3;

FIG. 2 is a cross-sectional plan view taken along the line II-II of FIG.

FIG. 3 is a front view of an example of the embodiment of the present invention.

FIG. 4 is a perspective view of an example of an embodiment of a guide plate.

FIG. 5 is a plan view of another example of the embodiment of the guide track.

FIG. 6 is a plan view of still another example of the embodiment of the guide track.

FIG. 7 is a plan view of another example of the embodiment of the pressing means.

FIG. 8 is a plan view of still another example of the embodiment of the pressing means.

FIG. 9 is a plan view of still another example of the embodiment of the pressing means.

FIG. 10 is a plan view of another example of the embodiment of the guide plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Foundation 2 Substrate 3 1st guide plate 4 2nd guide plate 5 Support plate 11 1st guide track 12 2nd guide track 13 1st pressing means 14 2nd pressing means 17 Rolling body 23 Sliding material 24 Pressing spring support plate (pressing force adjusting means) 25, 29 Adjusting screw (pressing force adjusting means) 26 Block (pressing force adjusting means)

 ────────────────────────────────────────────────── ─── Continued from the front page (72) Inventor Tomoya Ishida 3-5-3 Tatsumi, Koto-ku, Tokyo Mitsubishi Steel Corporation Environmental Engineering Division F-term (reference) 3J048 AA03 BC02 BG02 DA04 EA13

Claims (5)

[Claims] 1. A substrate fixed to a foundation, a support plate supporting an object to be seismically isolated, a first guide plate moving in the X-axis direction,
A second guide plate moving in the Y-axis direction orthogonal to the X-axis and fixed to the first guide plate; and a first guide provided on the first guide plate in a direction oblique to the X-axis. A track, a second guide track provided on the second guide plate in a direction oblique to the Y axis, first pressing means supported by the substrate and pressed by the first guide track, A second pressing means supported by a support plate and pressed against the second guide track, the seismic force absorbing device for a base-isolated structure. 2. The exemption device according to claim 1, wherein the angle of the first guide track and / or the second guide track in the oblique direction with respect to the X axis and / or the Y axis changes sequentially. Seismic force absorber for seismic structures. 3. The method according to claim 1, wherein the first pressing means and / or the second pressing means includes a rolling element which rolls with respect to the guide track and / or the second guide track. The seismic absorption device for the seismic isolation structure described. 4. The method according to claim 1, wherein the first pressing means and / or the second pressing means comprises a sliding member which slides on the guide track and / or the second guide track. The seismic absorption device for the seismic isolation structure described. 5. The seismic force absorbing device for a base-isolated structure according to claim 1, wherein the first pressing means and / or the second pressing means includes a pressing force adjusting means.