JPH0967956A - Laminated rubber for base isolation equipped with destruction preventing function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent destruction of laminated rubber for base isolation even in the case a seismic force over the assumable level is applied. SOLUTION: A wire 11 is threaded through a cavity 37 in a laminated rubber 10 for base isolation, which is equipped with end plates of steel 34, 35, and one end is coupled with one side of the end plates 34, 35 through a wire fixing mechanism 12 while the other end is coupled with the other side of the end plate 35 through a wire fasting mechanism 13. The wire 11 is to function as a stopper for hindering the body of the rubber from deformation to a degree exceeding the assumable limit, and thereby destruction of the rubber is precluded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated rubber for seismic isolation with a destruction preventing function.

[0002]

2. Description of the Related Art Conventionally, laminated rubber has been installed as a seismic isolation device between a building and the ground to lengthen the period of the building to provide seismic isolation and vibration isolation for the entire building.

As shown in FIG. 7, a laminated base rubber 30 for seismic isolation supporting the weight of the building constitutes a laminated rubber main body 31 by alternately laminating thin inner rubbers 32 and inner steel plates 33, and both ends thereof. By providing end steel plates 34, 35 having a diameter larger than that of the laminated rubber body 31 as a flange, and further covering with a covering rubber 36 for deterioration prevention, the one subjected to a vulcanization step, where heat and pressure are applied, At the same time as exhibiting elasticity peculiar to rubber, the coating rubber 36 is completely integrated with the internal rubber 32 by heat fusion (vulcanization adhesion). Then, in the center of the laminated rubber 30 for seismic isolation, an inner cavity 37 is provided by coaxially penetrating the inner rubber 32, the inner steel plate 33, and the end steel plates 34, 35. This hollow 37
In the vulcanization step, the cover rubber 36 is replaced with the inner rubber 32.
This is a hole to allow the heat to flow well during heat fusion.

The characteristic of the laminated rubber 30 for seismic isolation is that the thin inner rubber 32 and the steel plates 33, 34, 35 are alternately superposed and vulcanized and bonded, so that when the steel plates 33, 34, 35 are not present. Compared with this, the rigidity in the horizontal direction is very small, and it is perpendicular to the vertical load (horizontal direction).
Since the steel plates 33, 34, 35 restrain the steel plate from trying to spread, the rigidity is high.

FIG. 8A shows the seismic isolation laminated rubber 30 in a normal condition, and FIG. 8B shows a condition when an earthquake is applied. In the event of an earthquake, it will usually be seismically isolated laminated rubber 3
A horizontal displacement δH of 0 occurs within the expected maximum δHmax.

[0006]

However, when the seismic force exceeding the above assumption is applied, the laminated rubber main body 31 has a maximum value δHm.
There is a problem in that the laminated rubber body 31 is destroyed when it is greatly deformed beyond ax.

Therefore, an object of the present invention is to solve the above-mentioned problems and to prevent the laminated rubber body from being excessively deformed and destroyed when an unexpected earthquake force is applied. To provide laminated rubber for earthquakes.

[0008]

In order to achieve the above object, the invention as set forth in claim 1 is a seismic isolation system in which an inner cavity is provided in the center of a laminated rubber body in which internal rubbers and internal steel plates are alternately stacked. In the laminated rubber for use, a wire is passed through the inside cavity, and one end of the wire is connected to one of the end steel plates provided at the upper and lower ends of the laminated rubber for seismic isolation through the wire fixing mechanism, and the other end of the wire is also connected. Is connected to the other of the end steel plates via a wire tightening mechanism, and the wire functions as a stopper that prevents deformation of the laminated rubber body beyond the expected limit.

Since the length of the wire is constant, the seismic isolation laminated rubber begins to deform due to seismic force, and when the deformation is expected to exceed the maximum horizontal displacement δH, δHmax (see FIG. 8). Then, tension acts on the wire to suppress deformation.
Therefore, the breakage of the laminated rubber for seismic isolation is prevented. In addition,
In the present specification, the term "wire" is used in a broad sense including not only a literal wire but also a rod having the same function.

According to a second aspect of the present invention, a laminated rubber body for seismic isolation is provided in which end steel plates are provided at upper and lower ends of a laminated rubber body in which internal rubbers and internal steel plates are alternately stacked, and a central cavity is provided in the center. In, the stopper member is attached to one of the end steel plates and is inserted into the inner cavity, and the tip of the stopper member is located in the stop engagement part provided on the other end steel plate. It is configured so as to come into contact with the inner circumference to prevent the laminated rubber body from being deformed beyond an assumed limit.

Horizontal displacement δH expected for seismic isolation laminated rubber
If a large amount of deformation is exceeded beyond the maximum value δHmax (see FIG. 8), the stopper member comes into contact with the inner circumference of the braking engagement portion to prevent further deformation of the seismic isolation laminated rubber,
Therefore, the damage of the laminated rubber for seismic isolation is prevented.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments.

A seismic isolation laminated rubber 10 shown in FIGS. 1 and 2.
Has basically the same configuration as described in FIG.
That is, end steel plates 34 and 35 having a diameter larger than that of the laminated rubber body 31 are provided as flanges at the upper and lower ends of the laminated rubber body 31 in which the thin internal rubber 32 and the internal steel plate 33 are alternately stacked, and the covering rubber 35 is further provided. It has a structure in which the applied product is completely integrated (vulcanized and bonded) with the internal rubber 32 through a vulcanization process. And, in the center of the laminated rubber 30 for seismic isolation, the inner rubber 32, the inner steel plate 33 and the end steel plates 34, 3 are provided.
An inner cavity 37 is provided through the hole 5. This hollow 3
In the vulcanization step 7, the coating rubber 36 is the inner rubber 3
It is a hole for allowing the heat to be well mixed when heat-sealing with 2.

A wire 11 as a stopper is passed through the inside cavity 37 of the laminated rubber 10 for seismic isolation so as to have a destruction preventing function, and the upper end portion of the laminated rubber 10 for seismic isolation is attached by the wire 11. The steel plate 34 and the lower end steel plate 35 are connected. At that time, the wire fixing mechanism 12 is provided on the lower end steel plate 35 of the seismic isolation laminated rubber 10, and the tightening mechanism 13 is provided on the upper end steel plate 34.

In detail, in order to construct the wire fixing mechanism 12, an auxiliary plate 14 having a small hole 14a in the center is stacked and attached to the lower end steel plate 35 of the laminated rubber 10 for seismic isolation. The wire 11 is inserted from below into the small hole 14a provided at the bottom, and the root ball portion 11a provided at the lower end of the wire 11 is blocked by the small hole 14a. The portion of the wire fixing mechanism 12 is attached to the housing 15 from below.
Covered with.

On the other hand, in order to form the tightening mechanism 13 for the wire 11, the center plate 34a of the upper end steel plate 34 forming a part of the inner cavity 37 of the laminated rubber 10 for seismic isolation has a basin-shaped auxiliary plate. 16 are attached so that their bottoms are fitted in the central holes 34a, and the wires 11 are passed through the small holes 16a provided at the bottom of this auxiliary plate 16 from below, and their protruding ends (upper ends) are It is fixed with screws 17. This screw 17 causes the wire 11 to move to the bottom small hole 16 of the auxiliary plate 16.
It is prevented from coming out of a.

As described above, the wire 11 has the lower end portion thereof fixed by the wire fixing mechanism 12 and the upper end portion thereof fixed by the tightening mechanism 13, and the upper end steel sheet 3 of the laminated rubber 10 for seismic isolation is used.
4 and the lower end steel plate 35. It should be noted that the wire 11 may be applied with some tension in advance, or no tension may be applied at all.

Now, in the above structure, the laminated rubber for seismic isolation 1
When the laminated rubber body 31 of No. 0 tries to be largely deformed beyond the maximum value δHmax (see FIG. 8) of the expected horizontal displacement δH, as shown in FIG. The space between the steel plates 35 is pulled, and the laminated rubber 10 for seismic isolation cannot be further deformed. Therefore, the laminated rubber main body 31 of the seismic isolation laminated rubber 10 is not destroyed.

Here, when the laminated rubber body 31 of the seismic isolation laminated rubber 10 begins to deform due to seismic force and the deformation progresses,
Since the seismic isolation laminated rubber 10 has a vertical displacement (falling amount δv shown in FIG. 2), the upper end of the wire 11 must be in a tension-free state inside the basin plate 16 of the tightening mechanism 13. Under this condition, the deformation operation of the seismic isolation laminated rubber 10 is not hindered. However, when the seismic isolation laminated rubber 10 tries to deform greatly beyond the maximum value δHmax (see FIG. 8) of the expected horizontal displacement δH, as shown in FIG. Edge steel plates 34, 3
The state shifts to a state in which the seismic isolation laminated rubber 10 is deformed in a state in which the seismic isolation laminated rubber 10 is solidified.

In other words, the length M of the wire 11 is determined as follows. That is, when the laminated rubber body 31 of the laminated rubber 10 for seismic isolation begins to deform due to seismic force, and when the deformation progresses, the vertical displacement of the laminated rubber 10 for seismic isolation that eliminates the tension applied to the wire 11 (see FIG. 2). Amount of fall δv)
In consideration of this, the length obtained by subtracting only the length (non-tension length) A corresponding to the depth of the dish bottom of the deep dish auxiliary plate 16 from the interval between the upper and lower end steel plates 34, 35. You can set it to M. Here, the tension-free length A is increased to increase the wire 11
If the length M is reduced, a larger deformation can be allowed.

3 and 4 show another embodiment.
This is configured by using the rod 21 as the above-mentioned breakage prevention stopper. However, the rod here has the same function as the wire 11. That is, when the term "wire" is used in the present specification, the form of a rod is also included.

In this embodiment, the rod fixing mechanism 22 at the lower end of the rod 21 has a universal joint bearing 25 provided on an auxiliary plate 24 mounted on the lower end steel plate 35 and a bearing provided at the lower end of the rod 21. 25 and a root ball portion 21a rotatably supported on the shaft 25. The rod 21 is inserted from below into the small hole 25a provided in the bearing 25 of the auxiliary plate 24, and the root ball portion 21a provided at the lower end of the rod 21 is blocked by the small hole 25a. The portion of the rod fixing mechanism 22 is covered with the housing 15 from below.

On the other hand, the rod tightening mechanism 23 at the upper end with respect to the rod 21 is mounted on the upper end steel plate 34 by superimposing a deep plate-shaped auxiliary plate 26 in which the plate bottom is fitted in the central hole 34a. The rod 21 is passed through the small hole 27a of the bearing 27 of the universal joint provided on the plate bottom of the plate 26 from below, and further passed through the hemisphere 28, and then the protruding end (upper end) thereof is fixed with the screw 29. . This hemisphere 28
Is rotatably seated in the bearing 27, which prevents the rod 21 from coming off its auxiliary plate 26.

As described above, the rod 21 has its lower end portion and upper end portion, respectively, through the rod fixing mechanism 22 and the tightening mechanism 23 having the universal joint structure.
Upper end steel plate 34 and lower end steel plate 35 of the laminated rubber 10 for seismic isolation
Is stretched between

Therefore, the function of the rod 21 is exactly the same as that of the wire 11. That is, the lower end and the upper end of the rod 21 are bearings 2 of the universal joint.
Since it is only rotatively displaced about 5, 27, it does not function as a spring element and is exclusively used for the laminated rubber body 31.
Maximum horizontal displacement δH expected to be δHmax (see Fig. 8)
When a large amount of deformation is exceeded, as shown in FIG. 4, the steel plates 34 and 35 at the upper and lower ends are pulled to prevent further deformation of the seismic isolation laminated rubber 10. Prevent the destruction of 10.

5 and 6 show still another embodiment of the present invention.

In the embodiment shown in FIG. 5, instead of using the wire 11 or the rod 21 as a stopper for the destruction preventing function as described above, a conical stopper member 18 made of laminated rubber is attached to the upper end steel plate 34. It hangs down in the cavity 37, and the tip, that is, the lower end, is positioned in the center of the recess 19 formed by the central hole 35a corresponding to the middle cavity 37 of the lower end steel plate 35 and the circular recess provided in the ground. is there. When the seismic isolation laminated rubber 10 is going to be largely deformed beyond the maximum value δHmax (see FIG. 8) of the expected horizontal displacement δH during an earthquake, as shown in FIG.
The stopper member 18 comes into contact with the inner edge of the recess 19, here the inner periphery of the central hole 35a of the lower end steel plate 35, to prevent further deformation of the seismic isolation laminated rubber 10, and thus Prevent destruction. The reason why the stopper member 18 has a conical shape is to make the stopper member 18 itself as strong as possible, but unlike the case of the configurations of FIGS. 1 to 4, there is no problem even if it functions as a spring element to some extent. The stopper member 18 is not limited to the conical shape, and any shape or material such as a columnar shape or a prismatic shape can be used as the stopper member 18. In the case of the embodiment here, the conical stopper member 18 is made of laminated rubber and acts somewhat as a spring element.

In FIG. 6, the standing edge 20 is formed in the central hole 35a corresponding to the inner cavity 37 of the lower end steel plate 35, and the standing edge 2 is formed.
The tip of the stopper member 18 made of laminated rubber is located in the concave portion 19 formed by the inner periphery of 0, and the stopper member 18 made of laminated rubber is formed on the inner peripheral edge of the concave portion 19 at the time of an earthquake.
Are contacted with each other to prevent the seismic isolation laminated rubber 10 from being deformed beyond its expected limit, thereby preventing the seismic isolation laminated rubber 10 from being broken. In this embodiment, since the standing edge 20 is provided in the central hole 35a of the lower end steel plate 35,
The stopper member 18 is different from the case of FIG.
It is not necessary to extend over the entire length of the axial direction of 7, and it is not necessary to form the recess 19 in the ground. Therefore, the stopper member 18 that constitutes the destruction preventing function has the advantages that the rigidity in the horizontal direction increases as much as the stopper member 18 in FIG. 5 becomes shorter and the assembling process is greatly simplified.

In the above, the inverted conical stopper member 18 is used.
Although the stopper member 18 is attached to the upper end steel plate 34 side, the inverted conical stopper member 18 may be attached to the lower end steel plate 35 to prevent the movement on the upper end steel plate 34 side.

[0030]

In summary, according to the invention described in claim 1, the wire is passed through the middle cavity of the laminated rubber for seismic isolation,
By connecting the upper and lower end steel plates of the laminated rubber for seismic isolation through the wire fixing mechanism and the wire tightening mechanism, this wire functions as a stopper that prevents deformation of the laminated rubber body beyond the assumed limit. When an unexpected earthquake force is applied, tension acts on the wire to suppress deformation, and it is possible to prevent damage to the laminated rubber for seismic isolation.

Further, according to the invention described in claim 2, a stopper member made of laminated rubber is attached to one end steel plate and is inserted into the inner cavity, and its tip is provided on the other end steel plate. Since it is located inside the engagement part, if the seismic isolation laminated rubber tries to deform more than the expected limit, the stopper member comes into contact with the inner periphery of the stop engagement part of the end steel plate and seismic isolation laminated It is possible to prevent further deformation of the rubber and prevent breakage of the seismic isolation laminated rubber.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a laminated rubber for seismic isolation with a destruction prevention function according to the present invention.

FIG. 2 is a cross-sectional view showing deformation of the seismic isolation laminated rubber of FIG. 1 due to an earthquake.

FIG. 3 is a cross-sectional view showing another embodiment of the laminated rubber for seismic isolation with a breakage preventing function according to the present invention.

4 is a cross-sectional view showing deformation of the seismic isolation laminated rubber of FIG. 3 due to an earthquake.

FIG. 5 is a cross-sectional view showing still another embodiment of the laminated rubber for seismic isolation with a breakage preventing function according to the present invention.

6 is a cross-sectional view showing the deformation of the laminated rubber for seismic isolation of FIG. 5 due to an earthquake.

FIG. 7 is a view showing a cross section of a conventional laminated rubber for seismic isolation.

[Fig. 8] Fig. 8 is a view showing a normal state of a laminated rubber for seismic isolation and a case where seismic force is applied.

[Explanation of symbols]

10 Seismic Isolation Laminated Rubber 11 Wire 11a Root Bulb 12 Wire Fixing Mechanism 13 Wire Tightening Mechanism 14 Auxiliary Plate 14a Small Hole 15 Housing 16 Deep Dish-shaped Auxiliary Plate 16a Small Hole 17 Screw 18 Stopper Member 19 Recess 20 Erecting Edge 21 Rod 21a Root bulb 22 Rod fixing mechanism 23 Rod tightening mechanism 24 Auxiliary plate 25 Universal joint bearing 25a Small hole 26 Deep dish-shaped auxiliary plate 27 Universal joint bearing 27a Small hole 28 Hemisphere 29 Screw 30 Laminate for seismic isolation Rubber 31 Laminated rubber body 32 Internal rubber 33 Internal steel plate 34 Upper end steel plate (flange) 34a Central hole 35 Lower end steel plate (flange) 35a Central hole 36 Coated rubber 37 Medium cavity M Length of wire

Claims (2)

[Claims] 1. A seismic isolation laminated rubber having an inner cavity in the center of a laminated rubber body in which an inner rubber and an inner steel plate are alternately laminated, wherein a wire is passed through the inner cavity and one end of the wire is a wire. This wire is connected to one of the end steel plates provided at the upper and lower ends of the laminated rubber for seismic isolation via the fixing mechanism, and the other end of the wire is connected to the other end steel plate via the wire tightening mechanism. Is a seismic isolation laminated rubber with a breakage prevention function, which functions as a stopper that prevents deformation of the laminated rubber body beyond the expected limit. 2. A seismic isolation laminated rubber in which end steel plates are provided at both upper and lower ends of a laminated rubber body in which inner rubbers and inner steel plates are alternately laminated, and a central hollow is provided in the laminated rubber main body. A stopper member is attached to one side and inserted into the inner cavity, and its tip is positioned inside the braking engagement portion provided on the other end steel plate, and this stopper member abuts the inner circumference of the braking engagement portion and is laminated. A seismic isolation laminated rubber with a destruction prevention function, which is designed to prevent deformation of the rubber body beyond the expected limit.