JPH10184081A - Horizontal-displacement control mechanism in vibration-isolation building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To buffer the horizontal displacement of structures effectively by fixing one end section of a main body consisting of an elastic body onto one structure in structures relatively displaced in at least the horizontal direction, movably installing the other end section to the other structure and interposing the other end section between the structures. SOLUTION: An upper structure 10 is pushed from a periphery by the resilient force of a compressed spring 22 at the time of normality, and held at a normal place to a lower structure 11. When the upper structure 10 is displaced relatively in the horizontal direction to the lower structure 11 by the vibration isolation device 12 of a plain bearing at the time of an earthquake, the spring 22 in one horizontal-displacement control mechanism 20 is compressed, and the upper structure 10 is pushed. Since tensile force works to the spring 22 in the other horizontal-displacement control mechanism 20, a pedestal section 23 is slid to the opening section 25 side by a caster 28 in a guide 24. The pedestal section 23 is retained by the collar section 29 of an opening section 25 at the time of the large quantity of horizontal displacement of the upper structure 10, and tensile force works to the upper structure 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal displacement control mechanism which is interposed between structures which are relatively displaced in a horizontal direction in a base-isolated building and buffers the horizontal displacement of each other.

[0002]

2. Description of the Related Art In recent years, as the awareness of seismic resistance has risen, seismically isolated buildings have been designed to insulate vibrations that tend to propagate from the ground to the building due to earthquakes, thereby suppressing stress and deformation generated in the building frame. As shown in FIG.
The surrounding ground 2 is dug to form a buffer zone 3 corresponding to the behavior of the building at the time of the earthquake between the underground part and the underground part.
A seismic isolation device 6 having a predetermined axial rigidity, such as a laminated rubber, is interposed between the upper structure 5 and the upper structure 5 so that the seismic isolation device 6 supports the own weight and the loaded weight of the building. A seismically isolated building 1 is known in which the force acting in the horizontal direction of the ground 2 and the foundation structure 4 at the time is prevented by the axial rigidity of the seismic isolation device 6, thereby preventing the building 1 from generating excessive stress. ing.

In such a conventional seismic isolation building 1,
As the seismic isolation device 6, the upper and lower ends are made of laminated rubber or the like having a predetermined axial rigidity fixed to the base structure 4 and the upper structure 5, and the seismic isolation device 6 reduces the vertical load and the horizontal load. The seismic isolation device 6 is inevitably deteriorated over time due to the material of the structure. For this reason, it is necessary to secure a large space S having a height of about 2 m around the seismic isolation device 6 for maintenance and inspection and replacement.
A problem that the amount of excavation for forming the space S increases and the construction period is prolonged, and the cost of the seismic isolation device 6 itself is increased, resulting in an increase in the overall cost required for seismic isolation. There was a point. In addition, since the upper structure 5 needs to be jacked up in the space S when the seismic isolation device 6 is replaced, a great deal of time and work is required for replacement work including reinforcement of the surroundings. There were also points.

[0004]

The inventors of the present invention have conducted intensive studies to effectively solve the problems of the conventional seismic isolation building, and as a result, as shown in FIG. Between the lower structure 10 and the lower structure 11, the upper structure 10 is provided with a seismic isolation device 12 capable of moving horizontally with respect to the lower structure 11, and a side wall 10 a of the upper structure 10 and a retaining wall facing the side surface or A seismic isolation building has been developed in which a horizontal displacement control mechanism 13 is arranged between the side structure 11a of the lower structure 11 and a horizontal force acting on the upper structure by an elastic force of a spring, rubber or the like.

According to such a seismic isolation building, the own weight and loaded weight of the upper structure 10 can be reduced by the horizontally movable seismic isolation device 12 interposed between the upper structure 10 and the lower structure 11 of the building. While supporting on the structure 11, the relative horizontal displacement between the lower structure 11 and the upper structure 10 generated at the time of the earthquake is controlled by the elasticity of the horizontal displacement control mechanism 13 disposed between the side surfaces 10a, 11a. By damping with force, the building can be reasonably seismically isolated. In addition, since a sliding bearing or a roller bearing using stainless steel, for example, can be used as the seismic isolation device 12, aging degradation is taken into consideration, as in the case of a conventional shaft rigidity that resists vertical and horizontal loads. it is not necessary, therefore to the labor required for maintenance and replacement can be eliminated almost can keep the space S ₁ of the seismic isolation device 12 around a minimum. As a result, since the amount of surrounding excavation associated with the installation of the seismic isolation device 12 can be significantly reduced, it is possible to shorten the construction period and reduce the cost required for seismic isolation.

Further, in normal times, since the load of the building does not act on the horizontal displacement control mechanism 13 disposed between the side surfaces, it can be replaced very easily. Moreover, since the horizontal displacement control mechanism 13 buffers the horizontal displacement at the time of an earthquake by its elastic force without depending on the shaft rigidity, the above-mentioned inexpensive general-purpose cushioning material such as the above-mentioned spring or rubber can be used. Further, the cost can be further reduced. Therefore, according to the seismic isolation building, the entire building can be reasonably seismically isolated, maintenance and replacement are easy, and the amount of excavation for seismic isolation is reduced to shorten the construction period. Therefore, the cost of seismic isolation can be reduced as a whole.

Incidentally, in such a seismic isolation building, since a seismic isolation device 12 which is relatively movable in the horizontal direction is used, when an earthquake occurs, the upper structure 10 is used.
Moves in the XY direction relative to the lower structure 11 in the horizontal plane. For this reason, the horizontal displacement control mechanism 13 also
It is preferable to use one that buffers the horizontal displacement of the elastic body in the direction of expansion and contraction and follows the displacement of the upper structure 10 in a direction perpendicular to the horizontal displacement.

SUMMARY OF THE INVENTION The present invention has been made in response to the above-mentioned demands associated with the development of a new seismic isolation building. In a seismic isolation building, it is possible to smoothly follow horizontal displacement between structures that occur during an earthquake. It is an object of the present invention to provide a horizontal displacement control mechanism capable of effectively buffering the horizontal displacement.

[0009]

According to the first aspect of the present invention, there is provided a horizontal displacement control mechanism for a base-isolated building according to the present invention, wherein one end of a body made of an elastic body is relatively displaced at least in a horizontal direction. The structure is characterized in that it is fixed to one of the structures and the other end is movably provided with respect to the other structure and is interposed between the structures, thereby buffering horizontal displacement of the structures. Is what you do.

According to a second aspect of the present invention, a guide extending in a horizontal direction is provided on the other structure, and a pedestal portion is movably provided on the guide by a slide bearing. The other end of the main body is fixed, and the invention according to claim 3 is further characterized in that the guide has an opening in a horizontal direction on a surface facing one of the structures. And a stopper that locks the pedestal portion when the structure is displaced in a direction in which the structure is relatively separated is formed at the opening. Is what you do.

The invention described in claim 4 is the same as the claim 2.
Alternatively, the pedestal portion according to claim 3 is provided so as to be movable with respect to the upper and lower surfaces of the guide by a slide bearing, and the invention according to claim 5, wherein the main body includes: Each of the other ends is constituted by a plurality of elastic bodies fixed to the common base.

In the horizontal displacement control mechanism according to any one of the first to fifth aspects, the other end of the main body made of an elastic body having one end fixed to one structure is moved with respect to the other structure. Since it is provided freely, horizontal displacement in the direction in which the seismic isolation device is interposed between the structures can be buffered by the elastic force of the main body, and furthermore, the structure The other end can follow the horizontal displacement along the lateral direction between the other structures by moving along the other structure. In this case, according to the second aspect of the present invention, the pedestal portion at the other end of the main body moves along a guide provided on the other structure by a sliding bearing, so that the relative structure between the structures is displaced. It is possible to more reliably and smoothly follow the displacement.

Further, in the invention according to claim 3,
Since the stopper that locks the pedestal portion is formed in the opening that opens to the one structure side of the guide, when the structure is largely displaced in the direction of relatively separating, the pedestal portion is Since the stopper is locked by the stopper, further movement is prevented, so that the horizontal displacement between the structures is buffered by the restoring force of the main body which receives the pulling force. Therefore, the horizontal displacement control action particularly when a large earthquake occurs is improved.

Further, according to the invention described in claim 4,
Since the pedestal portion is provided movably with respect to the upper and lower surfaces of the guide by a sliding bearing, even when a relative displacement in the vertical direction occurs between the structures, the pedestal portion is provided on the upper and lower surfaces of the guide. There is no fear that the movement will be hindered by a collision, and the guide can smoothly move along the upper and lower surfaces. Further, when the main body is constituted by a plurality of elastic bodies fixed to a common pedestal portion, the bending rigidity of the entire main body can be increased, and thus the pedestal portion is provided. This is preferable because stable movement of the object can be ensured.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) FIGS. 3 to 5 show a first embodiment in which the horizontal displacement control mechanism for a base-isolated building according to the present invention is applied to the horizontal displacement control mechanism 13 for a base-isolated building shown in FIGS. 1 shows an embodiment. 1 and 2 are denoted by the same reference numerals and description thereof will be simplified. 3 and 4, the horizontal displacement control mechanism 20 includes a spring (main body) 22 having a plate 21 attached to one end, a pedestal 23 provided at the other end of the spring 22, and a lower structure ( The plate 21 is fixed to the side surface 10a of the upper structure (structure) 10 by bolts 21a. The guide 21 is roughly constituted by a side surface 11a of the structure 11 and a guide 24 installed in the horizontal direction.

On the other hand, the guide 24 is a gutter-like member formed of stainless steel or the like and having a U-shaped cross section, and the opening 25 formed in the horizontal direction faces the upper structure 10 side.
It is buried in 1. And in this guide 24,
The base 23 is movably disposed. This pedestal part 2
3 is a mounting plate 23a to which the other end of the spring 22 is fixed,
The top plate 23b and the bottom plate 23c extend from the upper and lower ends of the mounting plate 23a.
b and the bottom plate 23c, a roller 27
Are provided rotatably in the horizontal direction. Also, bottom plate 2
A caster 28 that is slidable in the horizontal XY direction by rotating the base end is provided on the lower surface side of 3c.

The spring 22 is inserted into the opening 25 in a somewhat compressed state between the upper structure 10 and the lower structure 11, so that the roller 27 moves the guide 24 by the spring force of the spring 22. Side 24a
It is provided so as to be movable in the horizontal direction while being pressed. Further, the casters 28 are provided movably along the lower surface of the guide 24 in the extending direction of the guide 24 and the expanding and contracting direction of the spring 22. Further, a flange portion (stopper) 29 is formed in the upper and lower portions of the opening 25 of the guide 24 so that the opening 25 is smaller than the vertical dimension of the mounting plate 23 a of the pedestal 23.

Next, the operation of the horizontal displacement control mechanism 20 having the above configuration will be described with reference to FIGS. 3 to 5 and FIG. First, as shown by a solid line in FIGS. 3, 4 and 13, in the normal state, the upper structure 10 is pressed from the surroundings by the spring force of the compressed spring 22, and the normal position with respect to the lower structure 11. Is held. Then, at the time of the earthquake, as shown in FIG.
When 0 moves horizontally relative to the lower structure 11 in the horizontal direction with respect to the lower structure 11 by the seismic isolation device 12 of the sliding bearing, as shown in FIG. 3, one (rightward in the figure) horizontal displacement control mechanism is provided. 20
The spring 22 is compressed and presses the upper structure 10 to the left in the drawing by the spring force. Further, with the horizontal displacement caused by the movement of the upper structure 10, a tensile force acts on the spring 22 of the other (left side in the figure) horizontal displacement control mechanism 20. Slides toward the opening 25 side. In particular, when the amount of horizontal displacement of the upper structure 10 is large as in the case of a large earthquake, the pedestal portion 23 is locked by the flange portion 29 of the opening 25, and the spring 22 is stretched by this. Due to the restoring force of the upper structure 10,
A pulling force acts to the left in the figure.

As described above, the horizontal displacement in the upper structure 10 is buffered by the pressing force and the tensile force from the horizontal displacement control mechanism 20 acting on the upper structure 10. At this time, as shown by a dotted line in FIG. 13, the upper structure 10 is displaced in the X-Y direction in the horizontal plane, so that in addition to the directions of contacting and separating from each other, the side surfaces 10a, 11a
5 (the direction of the front and back of FIG. 5).
For the relative displacement in the direction along the side surfaces 10a, 11a, the horizontal displacement control mechanism 20, to which the spring 22 receives the compressive force, causes the pedestal portion 23 to slide along the side surface 24a of the guide 24 by the roller 27. Follow by doing. On the other hand, the horizontal displacement control mechanism 20 in which a tensile force acts on the spring 22 has its pedestal 23
The caster 28 follows the horizontal displacement by sliding freely on the lower surface of the guide 24.

Therefore, according to the horizontal displacement control mechanism 20, the relative horizontal displacement of the upper and lower structures 10, 11 in the direction of contact and separation can be buffered by the expansion and contraction of the spring 22, which is an elastic body. Pedestal part 2 at the other end of spring 22 in which plate 21 is fixed to upper structure 10
3 is movably provided along the guide 24 provided on the lower structure 11 via the roller 27, so that the lower structure 11
In contrast, it is possible to smoothly follow the relative displacement of the upper structure 10 in a direction orthogonal to the direction in which the spring 22 expands and contracts.

Moreover, since the flange portion 29 for locking the pedestal portion 23 is formed in the opening portion 25 of the guide 24, the upper structure 10 is displaced in a direction extremely separated from the lower structure 11 during a large earthquake. , The pedestal portion 23 can be locked at the flange portion 29. As a result, the further movement of the pedestal portion 23 is prevented, so that the spring 22 is stretched and the restoring force of the spring 22 acts on the upper structure 10. Structure 1
Horizontal displacement between 0 and 11 can be effectively buffered. Therefore, it is possible to improve the horizontal displacement control action particularly when a large earthquake occurs.

(Embodiment 2) FIGS. 6 and 7 show a second embodiment of the present invention, in which the same components as those shown in FIGS. The description is omitted here. As shown in FIGS. 6 and 7,
In the horizontal displacement control mechanism 30, the main body is constituted by two springs 22 arranged in parallel in the horizontal direction. The guide 24 is directly mounted on the side surface 11a of the lower structure 11 via a bracket 24b. A common plate 21 to which one end of the spring 22 is fixed is fixed to the side surface 10a of the upper structure 10, and a common base 31 is fixed to the other end. In the pedestal portion 31, a mounting plate 31a is formed in a rectangular shape corresponding to the distance between the two springs 22, and two mounting shafts 32, 32 are provided between the top plate 31b and the bottom plate 31c. Rollers 33, 33 are provided rotatably in the horizontal direction, respectively. In addition, casters 34, 3
4 is provided rotatably in the horizontal XY directions along the upper and lower surfaces of the guide 24.

According to the horizontal displacement control mechanism 30 having the above-described structure, the same effect as that shown in the first embodiment can be obtained, and further, the pedestal portion 31 is mounted on the upper and lower surfaces of the guide 24 by the casters 34, 34. Even if the upper structure 10 and the lower structure 11 are vertically displaced relative to each other, the pedestal portion 31 collides with the upper and lower surfaces of the guide 24 to hinder the movement. The guide 24 can be smoothly moved along the upper and lower surfaces. In addition, the main body is connected to a common pedestal 3
Since it is constituted by the two springs 22 fixed to 1, the bending rigidity of the whole main body can be increased, and thus the stable movement of the pedestal portion 31 can be ensured.

The number and arrangement of the springs 22 constituting the main body are not limited to those shown in FIGS. 6 and 7, and for example, as shown in a modification shown in FIG.
The three springs 22 may be arranged at the vertices of an equilateral triangle, whereby the rigidity can be further increased with respect to bending moments acting in the vertical and horizontal directions. .

(Embodiment 3) FIGS. 9 to 11 show a third embodiment of the present invention. 9, in the horizontal displacement control mechanism 40, a circular tube 41 is erected on the plate 21 while the mounting plate 31a of the pedestal portion 31 has a shaft whose tip is inserted into the circular tube 41. The base end of the member 42 is fixed. The spring 22 is disposed between the plate 21 and the mounting plate 31a so as to surround the circular tube 41 and the shaft member 42. Here, as shown in FIG. 10, the length of the circular pipe 41 and the shaft 42 is such that the tip of the shaft 42 is Stay in
On the other hand, as shown in FIG. 11, at the time of the assumed maximum approach, the substantially entire length of the shaft member 42 is inserted into the circular tube 42, so that the distal ends of the circular tube 41 and the shaft member 42 are attached to the mounting plates 31a and 31a, respectively. The dimension is set to reach the vicinity of the plate 21.

Therefore, according to the horizontal displacement control mechanism 40, in addition to obtaining the same operation and effects as those shown in the first and second embodiments, the circular pipe 41 is erected on the plate 21. Since the shaft 42 fixed to the mounting plate 31a of the pedestal portion 31 is displaceably engaged with the inside of the circular tube 41, the shaft rigidity of the horizontal displacement control mechanism 40 can be greatly increased. As a result, when the upper and lower structures 10 and 11 are displaced in a direction perpendicular to the contact / separation direction (the direction of the front and back of the paper in FIGS. 9 to 11), the bending force acting on the horizontal displacement control mechanism 40 is changed to the circular tube 41 and Pedestal part 3 received by shaft member 42
1 so that the pedestal portion 31 can be smoothly guided to the guide 24.
Can be followed. Also, the spring 22
Since only the compressive force and the tensile force need to be borne, the dimensions and the like can be determined only by the spring force, so that the diameter of the spring 22 can be reduced.

Further, as in a modification shown in FIG. 12, a circular tube 45 having an inner diameter surrounding the spring 22 is erected on the plate 21, and the spring 22 is similarly surrounded on the mounting plate 31 a of the other pedestal 31. If a circular tube 46 whose tip is inserted into the circular tube 45 is fixed, the springs 2 are formed by the circular tubes 45 and 46.
2 to protect the spring 22.

In the first to third embodiments, only the case where the horizontal displacement control mechanism according to the present invention is applied to the seismic isolation building shown in FIGS. 1 and 2 has been described. However, the present invention is not limited to this, and it can be used as a horizontal displacement control mechanism that is interposed between structures that are relatively displaced in the horizontal direction and buffers each other in various types of seismic isolation buildings. .

[0029]

As described above, according to the horizontal displacement control mechanism according to any one of the first to fifth aspects, the horizontal structure in which the seismic isolation device is interposed between the structures in which the structures are separated from each other. For the displacement, this can be buffered by the elastic force of the main body, and for the horizontal displacement along the lateral direction between the structures, the other end moves along the other structure. Therefore, the relative displacement in the horizontal direction that occurs during an earthquake can be reliably buffered. In particular, according to the invention described in claim 2, since the pedestal portion at the other end of the main body is moved by the slide bearing, it is possible to more reliably and smoothly follow the relative displacement between the structures, According to the third aspect of the present invention, when the structure is largely displaced in the direction in which the structure is relatively separated from each other, the horizontal displacement between the structures is buffered by the restoring force of the main body which receives the tensile force. Therefore, it is possible to improve the horizontal displacement control action when a large earthquake occurs.

Further, according to the invention described in claim 4,
The base can be smoothly moved along the upper and lower surfaces of the guide even when a relative displacement in the vertical direction occurs between the structures. According to the invention as set forth in claim 5, the main body as a whole The bending rigidity of the pedestal can be increased, and the stable movement of the pedestal can be secured.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing an example of a base-isolated building provided with a horizontal displacement control mechanism according to the present invention.

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

FIG. 3 is a longitudinal sectional view showing the first embodiment of the present invention.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is a longitudinal sectional view showing a displacement state of the horizontal displacement control mechanism of FIG. 3;

FIG. 6 is a longitudinal sectional view showing a second embodiment of the present invention.

FIG. 7 is a sectional view taken along line VII-VII of FIG. 6;

FIG. 8 is a side view showing a modification of the horizontal displacement control mechanism of FIG.

FIG. 9 is a longitudinal sectional view showing a third embodiment of the present invention.

10 is a longitudinal sectional view showing a state where a tensile force acts on the horizontal displacement control mechanism of FIG. 9;

FIG. 11 is a longitudinal sectional view showing a state in which a compressive force acts on the horizontal displacement control mechanism of FIG. 9;

12 is a longitudinal sectional view of a main part showing a modification of the horizontal displacement control mechanism of FIG. 9;

FIG. 13 is a plan view showing a displacement state at the time of an earthquake of a base-isolated building in which the first or second embodiment is interposed.

FIG. 14 is a schematic vertical sectional view showing a conventional seismic isolation building.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Upper structure (structure) 11 Lower structure (structure) 10a, 11a Side surface 20, 30, 40 Horizontal displacement control mechanism 21 Plate 22 Spring (main body) 23, 31 Base 23a, 31a Mounting plate 24 Guide 25 Opening 27 , 33 Roller 28, 34 Caster 29 Flange (stopper)

Claims (5)

[Claims] 1. A horizontal displacement control mechanism for a base-isolated building that is interposed at least between structures that are relatively displaced in a horizontal direction and buffers each other's horizontal displacement, comprising: A horizontal displacement control mechanism for a base-isolated building, characterized in that the horizontal displacement control mechanism is fixed to one of the above structures and the other end is movably provided with respect to the other of the above structures. 2. A guide extending in a horizontal direction is provided on the other structure, and a pedestal portion is movably provided on the guide by a sliding bearing, and the other end of the main body is fixed to the pedestal portion. The horizontal displacement control mechanism for a base-isolated building according to claim 1, wherein 3. The guide is a gutter-like member having a U-shaped cross section having an opening formed in a horizontal direction on a surface facing the one structure, and the structure is provided in the opening. The horizontal displacement control mechanism for a base-isolated building according to claim 2, wherein a stopper that locks the pedestal portion when displaced in a direction of relatively separating is formed. 4. The horizontal displacement control mechanism for a base-isolated building according to claim 2, wherein the pedestal portion is provided movably with respect to the upper and lower surfaces of the guide by a slide bearing. . 5. The apparatus according to claim 2, wherein the main body is constituted by a plurality of elastic bodies each of which has the other end fixed to the common pedestal. Horizontal displacement control mechanism for a base-isolated building.