JPH09302983A - Seismic isolator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To promote resistance to tension without making any sacrifice of seismic isolation efficiency to expand application. SOLUTION: This seismic isolator is so constituted that a tensile device 16 controlling tension acting on a laminator 15 is provided around the laminator 15 laminated alternately by rubber plates and thin steel plates and that the tensile device 16 is equipped with guide members 20 and 21 bearing both ends of tension members 22 extended between a footing beam 11 on the ground 12 and a lower beam 13 of a building 14 in the direction at right angles to each other in a movable manner. By the constitution, the tension members 22 are followed on the action of the laminator 15 oscillated in the horizontal direction by earthquake motion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation device for protecting a building from shaking caused by an earthquake.

[0002]

2. Description of the Related Art This type of seismic isolation device is usually arranged between a ground 2 and a building 3, as shown by reference numeral 1 in FIG.
It receives the entire load of the building 3. As shown in FIG. 6 as an example, the seismic isolation device 1 includes a laminated body 6 in which circular rubber plates 4 and thin iron plates 5 are alternately laminated, and a core material press-fitted into a center hole of the laminated body 6. 7 and a covering material 8 for covering the outer periphery of the laminated body 6, and the ground 2 and the building 3 by a fastening member (not shown) through which flange plates 9 and 9 joined to the upper and lower surfaces of the laminated body 6 are passed. It is supposed to be fixed for both. In addition, as the core material 7,
Lead or hard rubber is selected.

In the seismic isolation device 1 as described above, the laminated body 6 plays a role of extending the earthquake period and transmitting it to the building 3, and the core material 7 functions as a damper for absorbing horizontal moving energy. The shaking of the building 3 can be significantly suppressed. The seismic isolation device is one in which press-fitting of the core material 7 into the center hole of the laminated body 6 is omitted and the center hole is simply opened as a hollow portion. There are those having a real cross section, those having a damper independent of the laminated body 6, and the like.

[0004]

By the way, the laminate 6 constituting the seismic isolation device 1 has characteristics similar to concrete that it is strong against compression but weak against tension. . However, since the conventional seismic isolation device 1 does not take any special measures against tension, the structure has a large height-width ratio (exceeds 3: 1) and a short span portion exists, so that the rigidity is low. There is a problem that it is difficult to apply to buildings such as concentrated buildings that are prone to tilt due to earthquake motion, and the application range is greatly limited.

As a countermeasure against the above-mentioned tension, there is a concept of connecting the ground and the building with tension members, but it is designed to be displaced by up to 40 cm in any horizontal direction (360 degrees) in the event of a large earthquake. The above-mentioned tensile member acts on the laminated body 6 present to suppress the displacement in the horizontal direction, and the seismic isolation performance of the laminated body 6 is deteriorated.

The present invention has been made in order to solve the above-mentioned conventional problems, and its object is to increase the resistance force against tension without sacrificing the seismic isolation performance, thereby expanding the range of application. Is to try.

[0007]

In order to solve the above-mentioned problems, the present invention provides a laminate comprising a rubber plate and a thin iron plate alternately laminated between a ground and a building. In a seismic isolation device in which a tensile strength device that generates a force against the tensile force acting on the laminated body is arranged around, the tensile strength device is a tensile member extended between the ground and a building, and a tensile member of the tensile member. It is characterized in that it comprises a joining means for joining both ends to both the ground and a building, and the joining means is configured to cause the tension member to follow the horizontal movement of the laminate. .

In the seismic isolation device described above, when the laminated body is displaced in the horizontal direction due to an earthquake, the tensile member follows the movement of the laminated body, and when a tensile force acts on the laminated body, the tensile member exerts the tensile force. Acts to suppress.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 and 2 show a first embodiment of the present invention. In these figures, 10 is a seismic isolation device according to the present invention, 11 is a foundation beam placed on the ground 12, 13 is a lower beam of the building 14, and the seismic isolation device 10
Is interposed between the foundation beam 11 and the lower beam 13. The seismic isolation device 10 is roughly configured by a laminated body 15 in which rubber plates and thin iron plates are alternately laminated, and a tensile strength device 16 that suppresses a tensile force acting on the laminated body 15. The laminated body 15 is arranged at a position below the pillar 14a of the building 14, and is fixed to the foundation beam 11 and the lower beam 13 via the flange plates 17 joined to the upper and lower surfaces thereof. On the other hand, two tensile strength devices 16 are arranged in the lateral direction of the laminated body 15, and each of them is operatively connected to the foundation beam 11 and the lower beam 13.

As shown in FIG. 1, the tensile strength device 16 has a lower guide 20 fixed to the upper surface of the foundation beam 11 on the ground 12 and an upper guide fixed to the lower surface of the lower beam 13 of the building 14. 21 and lower and upper guides 20 and 21
And a tension member 22 extending between the two. The lower and upper guides 20 and 21 constitute a connecting means for connecting both ends of the tension member 22 to the ground 12 and the building 14, and each has a rectangular tube shape, and a flange 21a provided on each base side thereof. With the connecting member (bolt, H steel, etc.) 23 through which the lower guide 20 side is omitted, the foundation beam 1
1. The lower beam 13 is fixed in a mutually orthogonal arrangement. Further, slits 2 are formed on the front side walls of the lower and upper guides 20 and 21 so as to extend in the respective longitudinal directions.
4 and 25 are formed, and both ends of the tension member 22 are introduced into the lower and upper guides 20 and 21 through the slits 24 and 25.

The tension member 22 is made up of a long bolt here, and its head portion 22a is located inside the lower guide 20 and the tip portion of its screw portion 22b is located inside the upper guide 21. In the lower and upper guides 20 and 21, the pulling member 22 has a rectangular stopper plate 2
6, 27 are fitted. A stopper plate (lower stopper plate) 26 in the lower guide 20 is held by the tension member 22 while being seated on the head portion 22a of the tension member 22 via a washer 28. On the other hand, the stopper plate (upper stopper plate) 27 in the upper guide 21 has its lower surface abutted against the inner wall surface of the upper guide 21 and its upper surface in a lock nut 29 screwed into the threaded portion 22b of the tension member 22. The washer 30 is abutted through and fixed in position.

That is, the upper stopper plate 27 is
The upper guide 21 while being pressed by the lock nut 29
Fixed in place, and therefore the lock nut 2
By adjusting the screwing position of 9, the gap between the lower stopper plate 26 and the upper stopper plate 27 can be arbitrarily changed. The distance between the lower stopper plate 26 and the upper stopper plate 27 is set with reference to the height of the laminated body 15 when the entire load of the building 14 is applied to the laminated body 15, and the lower side is normally set. A predetermined gap δ is formed between the upper surface of the stopper plate 26 and the inner wall surface of the lower guide 20. The size of this gap δ is set so that it becomes 0 when the axial force acting on the laminate 15 changes from compression to tension. Therefore, during the normal seismic isolation operation in which the laminated body 15 is displaced in the horizontal direction, this gap δ is maintained, so that the stopper plates 26 and 27 are provided with the corresponding lower and upper guides 20.
And 21 to be freely movable, and accordingly, the tension member 22 causes the slits 24 of the guides 20 and 21 to move.
Move along 25.

Here, the lower and upper guides 20 and 21
On the inner wall surface of the container, a fluorocarbon resin (Teflon) coating layer 3 is formed to facilitate sliding of the stopper plates 26 and 27.
1, 32 are provided. Further, a washer 33 for maintaining the vertical posture of the tension member 22 with respect to the lower and upper guides 20 and 21 is provided on the threaded portion 22b of the tension member 22,
Nuts 35 and 36 with 34 are screwed together.

In the above-described first embodiment, the seismic isolation action is provided so that the laminated body 15 swings in the horizontal direction and suppresses the shaking of the building 14 against normal earthquake motion. At this time, since a predetermined gap δ is formed between the upper surface of the lower stopper plate 26 and the inner wall surface of the lower guide 20 (actually the surface of the coating layer 31), the slits 24, 25 of the guides 20, 21 are formed. The pulling member 22 smoothly moves along, and as a result, the seismic isolation action of the laminated body 15 is not hindered. On the other hand, when the building 14 tilts due to a large earthquake, or when the building 14 moves up and down largely due to a direct earthquake, a tensile force is applied to the laminated body 15 to cause the above-mentioned gap δ. Then, the lower stopper plate 26 is strongly pressed against the inner wall surface of the lower guide 20.
As a result, the upper stopper plate 27 is also strongly pressed against the inner wall surface of the upper guide 21, a tensile stress is generated in the tension member 22, and tilting or upward movement of the building 14 is suppressed.

FIG. 3 shows a second embodiment of the present invention. The feature of the second embodiment is that an I-shaped beam 40 (lower side is omitted) is used as the lower and upper guides, and a shaft-shaped member 42 having a pair of rollers 41 at the upper and lower ends as a tensile member. The shaft-like member 42 is bridged between the upper and lower I-shaped beams 40 while the roller 41 is rotatably mounted on the flange portion 40a of the beam 40 by using. The operation of the second embodiment is the same as that of the first embodiment described above.
In the case where the shaft-shaped member 42 follows the movement of 5 and the building 14 largely tilts or vertically moves, tensile stress is generated in the shaft-shaped member 42 and the tilting or upward motion of the building 14 is suppressed. . In the second embodiment, however, the shaft-shaped member 42 is engaged with the I-shaped beam 40 serving as the upper and lower guides via the roller 41, so that the movement thereof is extremely smooth and the laminated body 15 The seismic isolation effect of is more reliably guaranteed.

FIG. 4 shows a third embodiment of the present invention. In the third embodiment, the upper guide 21 in the first embodiment is omitted and the building 14
An anchor (bolt in this case) 50 as a fixing member is embedded in the lower beam 13 of the lower beam 13 of the anchor 50.
The shaft-shaped member 5 as a tension member on the head 50a exposed from the
The upper end of 1 is joined. On the other hand, on the ground 11, the first
In place of the lower guide 20 in the embodiment, a two-stage guide 52 is arranged, and the two-stage guide 52 has the shaft-shaped member 51.
Supports the lower end of the. The two-stage guide 52 is the ground 1
1 and a guide member 55 slidably coupled to the substrate 53 via a slide plate 54. The guide member 55 has the same basic structure as the lower guide 20 in the first embodiment, and a slit 56 is formed in the upper side wall thereof to allow the shaft-shaped member 51 to pass therethrough. A fluororesin (Teflon) coating layer 57 is provided on the wall surface. A stopper plate 58 is provided at the lower end of the shaft-shaped member 51 which is inserted into the guide member 55 through the slit 56.
Are integrally provided, and the upper surface of the stopper plate 58 always faces the inner wall surface of the guide member 55 (actually the surface of the coating layer 57) with a predetermined gap δ. There is.

The guide member 55 is provided on the upper surface of the substrate 53.
A plurality of key grooves 59 each having a trapezoidal cross section are formed to extend in a direction orthogonal to the slits 56, while the key groove 5 is formed on the lower surface of the slide plate 54 integrated with the guide member 55.
A key 60 that can be fitted to the 9 is formed. The guide member 55 is slidably and immovably coupled to the base plate 53 by sliding the key 60 of the slide plate 54 into the key groove 59 of the base plate 53 from the lateral direction. A fluororesin (Teflon) coating layer 61 for smooth sliding of the slide plate 54 is provided on the upper surface of the substrate 53 and the inner surface of the key groove 59.

In the above-described third embodiment, the seismic isolation effect is provided so that the laminated body 15 swings in the horizontal direction and suppresses the shaking of the building 14 against normal earthquake motion (FIG. 2). . At this time, since a predetermined gap δ is formed between the upper surface of the stopper plate 58 and the inner wall surface of the guide member 55, the shaft-shaped member 5 is formed along the slit 56 of the guide member 55.
1 moves smoothly, and the guide member 55 moves to the shaft-shaped member 51 through the slide plate 54 in the direction orthogonal to the moving direction, and as a result, the seismic isolation effect of the laminated body 15 is hindered. Disappear. On the other hand, if the building 14 tilts due to a large earthquake, or if the building 14 moves up and down significantly due to a direct earthquake, the laminated body 15
A tensile force is applied to the clearance δ to eliminate the gap δ, and the stopper plate 58 is strongly pressed against the inner wall surface of the guide member 55. As a result, tensile stress is generated in the shaft-shaped member 51,
Tilt or upward movement of the building 14 is suppressed. According to the third embodiment, the tensile strength device is almost completed only by subassembling the two-stage guide 52 and installing it on the ground 11, so that the assembling work is significantly simplified.

The above-mentioned two-stage guide is a so-called X
The Y-table can be replaced, and in this case, the shaft-shaped member 51 as a tension member can be fixed to the upper table.

[0021]

As described in detail above, according to the seismic isolation device of the present invention, the tensile member constituting the tensile strength device follows the movement of the laminated body, so that the seismic isolation action of the laminated body is guaranteed. Moreover, since the tensile force applied to the laminated body can be suppressed by the tensile member, the range of applicable buildings is expanded.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a tensile strength device constituting a seismic isolation device according to the present invention.

FIG. 2 is a schematic diagram showing the overall configuration and installation mode of the seismic isolation device.

FIG. 3 is a sectional view showing another embodiment of the present tensile strength device.

FIG. 4 is a sectional view showing still another embodiment of the present tensile strength device.

FIG. 5 is a schematic diagram showing a general installation mode of a seismic isolation device.

FIG. 6 is a cross-sectional view showing a structure of a laminated body used in the seismic isolation device.

[Explanation of symbols]

 10 seismic isolation device 11 foundation beam 12 ground 13 lower beam 14 building 15 laminate 16 tensile strength device 20 lower guide (coupling means) 21 upper guide (coupling means) 22 tensile member (long bolt) 24, 25, 56 slit 26, 27,58 Stopper plate 40 I-shaped beam (guide) 41 Roller 42,51 Shaft member (pulling member) 50 Anchor (fixing member) 52 Two-step guide (coupling means) 53 Substrate 54 Slide plate 55 Guide member 59 Keyway 60 Key

Claims (1)

[Claims] 1. A laminated body formed by alternately laminating a rubber plate and a thin iron plate is interposed between a ground and a building, and a force against a tensile force acting on the laminated body is provided around the laminated body. In a seismic isolation device provided with a tensile strength device to be generated, the tensile strength device is composed of a tension member extending between the ground and the building, and a coupling means for coupling both ends of the tension member to both the ground and the building. The seismic isolation device is characterized in that the coupling means causes the tension member to follow the horizontal movement of the laminated body.