JP2001355676A - Laminated rubber supporting device containing lead plug - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated rubber supporting device containing a lead plug capable of preventing lowering of vibration energy absorbing performance of the lead plug by allowing plastic deformation of the stable lead plug and maintaining initially required performance over a long period. SOLUTION: This laminated rubber supporting device 1 containing the lead plug is provided with laminated rubber 6 made by alternately laminating reinforcing layers 4 and rubber layers 5, the lead plug 7 arranged through the laminated rubber 6 and intermediate plates 8 arranged within the rubber layers 5 between the reinforcing layers 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention supports a structure such as a building such as a building, a bridge or a bridge girder such as a highway, etc., and does not transmit vibrations such as earthquakes to the structures. The present invention relates to a laminated rubber bearing device containing a lead plug which is disposed between a structure and a pier or the ground for early damping, and which can be used in, for example, a seismic isolation device.

[0002]

SUMMARY OF THE INVENTION A laminated rubber bearing device made of laminated rubber in which reinforcing layers and rubber layers are alternately laminated is disposed between a structure and the ground or the like to reduce the load of the structure. Support and prevent vibrations such as earthquakes from being transmitted to the structure. However, the bearing device made of such a laminated rubber cannot expect a damping function for vibration so much.
For this reason, high damping rubber or the like is used as a material for forming the rubber layer, but this does not provide a satisfactory damping effect.

Therefore, there has been proposed a bearing device in which lead (lead plug) is disposed so as to penetrate through the reinforcing layer and the rubber layer, and is made of laminated rubber containing lead plug utilizing energy absorption by shear plastic deformation of lead. In this laminated rubber bearing device containing a lead plug, a good damping characteristic is obtained by the lead plug, and it tends to be frequently used in the future. It has been found that as the thickness of the layer increases, some problems may occur in the vibration energy absorption capacity of the lead plug.

For example, if the thickness of each rubber layer is large, it may be difficult to generate stable shear plastic deformation as designed for the lead plug upon vibration, and the vibration energy absorbing ability of the lead plug may be reduced. .

[0005] In particular, due to the recent increase in size of bridge girders on highways and the like, laminated rubber bearings (rubber shoes) containing lead plugs arranged between the bridge girders and the piers to support the bridge girders.
Also tends to increase in size and the thickness of each rubber layer increases.
If the laminated rubber bearing device containing a lead plug having such a thick rubber layer is sheared in the horizontal direction by the horizontal vibration applied to the bridge girder during an earthquake, the initial required performance may not be able to be exhibited.

The present invention allows free deformation for pure shear plastic deformation to maximize the high free deformability of the lead plug, while restraining the lead plug to maintain its original diameter. It was made based on the finding that the above problem can be solved by
To provide a laminated rubber bearing device containing a lead plug that allows stable plastic deformation of the lead plug, prevents a decrease in the vibration energy absorption capacity of the lead plug, and maintains the initial required performance for a long period of time. is there.

[0007]

According to the first aspect of the present invention, there is provided lead.
The laminated rubber bearing device with a plug includes a reinforcing layer and a rubber layer,
Adjacent reinforcing layers have their facing distance d.
And a laminated rubber that is alternately laminated,
A small diameter φ disposed through the reinforcing layer and the rubber layer
At least one lead plug and this lead plug will be restrained
Enclose the lead plug and
An intermediate press having an outer diameter Φ and a thickness t disposed in a rubber layer
The outer diameter Φ of the intermediate plate is
Value = [φ ²+ 12φ (dt)]^1/2From 0.5 times
It has a value of 1.5 times.

According to the bearing device of the first aspect, the intermediate plate is disposed in the rubber layer between the reinforcing layers, and has an outer diameter Φ of 0.5 to 1.5 times the reference value. Because it has, the lead plug can be securely held in the laminated rubber,
Moreover, since such a reference value is based on the facing distance d, the diameter φ of the lead plug, and the thickness t of the intermediate plate, an optimum outer diameter Φ can be obtained for these effects, so that By allowing the plastic deformation of the lead plug to be stable, it is possible to prevent a decrease in the vibration energy absorbing ability of the lead plug, and to maintain the initial required performance for a long time. That is, when the thickness of the rubber layer is increased, the lead plug is bent and deformed, and cannot exhibit the vibration energy absorbing ability due to the shear deformation of the lead plug. However, as in the first embodiment of the present invention, the intermediate plate is provided. As a result, the lead plug is desirably sheared and deformed, and the lead plug can exhibit the desired vibration energy absorbing ability.

If the outer diameter Φ of the intermediate plate is smaller than 0.5 times the reference value, the binding force on the lead plug is reduced, and the function of the intermediate plate cannot be sufficiently performed.
If it is larger than 1.5 times the reference value, it may not be possible to obtain the desired shear deformation based on the thick rubber layer. From this viewpoint, the outer diameter Φ of the intermediate plate is preferably Has a value of 0.9 to 1.1 times the reference value, more preferably the lead plug-containing laminated rubber bearing device of the third aspect of the present invention. Like a laminated rubber bearing, it has a substantially reference value.

[0010] A fourth aspect of the present invention is a laminated rubber with a lead plug.
The rubber bearing supports the reinforcing layer and the rubber layer in the same manner as the adjacent reinforcing layer.
Have the facing distance d and alternately
And a reinforcing layer and a rubber layer of the laminated rubber.
At least one lead having a diameter φ disposed therethrough
The plug and the lead plug to restrain the lead plug
And is arranged in the rubber layer between the reinforcing layers.
And an intermediate plate having an outer diameter Φ and a thickness t.
And the outer diameter Φ of the intermediate plate is the reference value = [φ ²+12
φ (dt)]^1/2It is determined based on

According to the bearing device of the fourth aspect, since the outer diameter Φ of the intermediate plate disposed in the rubber layer between the reinforcing layers is determined based on the reference value, the lead plug is laminated. It can be securely held in rubber, and since such a reference value is based on the facing distance d, the diameter φ of the lead plug, and the thickness t of the intermediate plate, the optimum outer diameter for obtaining the above-mentioned effects is obtained. Φ, thus allowing stable plastic deformation of lead, preventing deterioration of lead's vibration energy absorption capacity, and maintaining the initial required performance for a long period of time. Equipment can be provided.

The determination of the outer diameter Φ of the intermediate plate based on the reference value of the bearing device according to the fourth aspect is also based on the reduction of the binding force to the lead plug, the full function of the intermediate plate, and the thick rubber layer. It is preferable that the shear deformation is performed in consideration of a desired shear deformation.

The reinforcing layer and the intermediate plate may be firmly joined to the rubber layer by using an appropriate adhesive. However, preferably, the reinforcing layer and the intermediate plate are the same as those of the laminated rubber bearing device with lead plug according to the fifth aspect of the present invention. The rubber layer is vulcanized and bonded, and the reinforcing layer and the intermediate plate are made of a metal such as a steel plate or a hard resin plate, preferably a laminated rubber containing lead plugs according to the sixth aspect of the present invention. Like a bearing device, a steel plate is used, and a through hole through which a lead plug passes is formed in advance in such a plate. The plate constituting the reinforcing layer may have any shape such as a circle, an ellipse, or a square.

As a material for forming the rubber layer, synthetic rubber, preferably natural rubber can be used. When each reinforcing layer is made of metal such as steel plate, oxidation due to exposure of the outer peripheral edge to the outside is performed. To protect against various kinds of corrosion such as rust due to
On the outer periphery of the rubber layer, a cylindrical coating outer layer may be provided integrally with the rubber layer so as to cover the outer peripheral edge of each reinforcing layer,
The same material as the material for forming the rubber layer or a rubber material having excellent weather resistance is used for the outer coating layer, and it is preferable that the outer layer be integrally formed with the rubber layer simultaneously with the formation of the rubber layer, for example, vulcanized.
It is preferable to use a high-damping rubber for the rubber layer and, if necessary, for the outer coating layer, because vibration energy can be further effectively attenuated.

As a material for forming the lead plug, pure lead is preferable. Usually, the pure lead is pressed into a through hole defined by the rubber layer, the reinforcing layer and the inner peripheral surface of the intermediate plate, and the lead plug is inserted through the through hole. Although formed in the hole, a rubber layer, a reinforcing layer, and an intermediate plate may be alternately laminated around the lead plug. A single lead plug may be used, but a plurality of lead plugs may be juxtaposed by penetrating the reinforcing layer and the rubber layer of the laminated rubber. Things. The reinforcing layer and the intermediate plate surrounding such a lead plug have an inner peripheral surface in close contact with the peripheral surface of the lead plug, as in the laminated rubber bearing device containing a lead plug according to the seventh aspect of the present invention. Even if the peripheral surface of the lead plug is constrained, like the laminated rubber bearing device with the lead plug according to the eighth aspect of the present invention, the lead plug is interposed through a thin rubber layer that is in close contact with the peripheral surface of the lead plug. The outer surface may be restricted by the inner peripheral surface. If there is a gap between the peripheral surface of the lead plug and the inner peripheral surfaces of the rubber layer, the reinforcing layer, and the intermediate plate, it is not possible to obtain the effective vibration energy absorption capability and the so-called trigger function of the lead plug. It is desirable to eliminate such gaps.

According to the design method of the present invention for the laminated rubber bearing device containing a lead plug as described above, the outer diameter Φ of the intermediate plate is determined by calculating from the reference value = [φ ² + 12φ (dt)] ^1/2. It consists of doing.

By designing a laminated rubber bearing device containing lead plugs by such a method, the lead plugs can be securely held in the laminated rubber, and the distance d between the facing surfaces, the diameter φ of the lead plugs, and the thickness t of the intermediate plate can be ensured. In order to obtain the above-mentioned effect, an optimal outer diameter Φ can be obtained.
Thus, a laminated rubber bearing device containing a lead plug that can allow stable plastic deformation of the lead plug, prevent a decrease in the vibration energy absorption capacity of the lead plug, and maintain the initial required performance for a long period of time. Can be provided.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described in more detail with reference to the preferred embodiments shown in the drawings. The present invention is not limited to these embodiments.

[0019]

1 to 4, a laminated rubber bearing device 1 including a lead plug according to the present embodiment includes an upper and lower thick reinforcing plate 2 made of a steel plate.
And a layer in which a reinforcing layer 4 having a plurality of thin reinforcing plates 3 and a rubber layer 5 made of natural rubber are alternately layered between adjacent reinforcing layers 4 with a facing distance d therebetween. The rubber 6, four lead plugs 7 each having a diameter φ that are arranged side by side through the reinforcing layer 4 and the rubber layer 5 of the laminated rubber 6, and each lead plug 7 is restrained. An intermediate plate 8 surrounding the lead plug 7 and having an outer diameter Φ and a thickness t disposed in the rubber layer 5 between the reinforcing layers 4 is provided.

Each reinforcing layer 4 surrounding the lead plug 7 is formed of a plate made of a large steel plate or the like having a square planar shape and having four through holes 11, and the reinforcing layer 4 The inner peripheral surface that defines the through hole 11 is the peripheral surface 12 of the lead plug 7.
And closely restrains the peripheral surface 12 of the lead plug 7,
The outer peripheral surface 13 of each reinforcing layer 4 is formed integrally with the rubber layer 5 and is covered with a rectangular cylindrical covering outer layer 14 made of the same material as the rubber layer 5.

Each rubber layer 5 surrounding the lead plug 7 has a rectangular planar shape and has four through holes 21, and each rubber layer 5 has an inner peripheral surface that defines the through hole 21. Plug 7
The outer peripheral surface of each rubber layer 5 is covered with a coating outer layer 14 integrated with each rubber layer 5.

The intermediate plate 8 surrounding the lead plug 7
The intermediate plate 8 has an inner peripheral surface that defines a through hole 22 and a lead plug 7.
And the outer surface Φ of the intermediate plate 8 is substantially equal to the reference value = [φ ² + 12φ (dt)] ^{1 / Two} . The intermediate plate 8 and the reinforcing layer 4 are firmly vulcanized and bonded to the rubber layer 5.

Each lead plug 7 has a through hole 11 in each reinforcing layer 4, a through hole 2 in each intermediate plate 8 and a through hole 2 in each rubber layer 5.
2 and 21 are press-fitted.

The above-described laminated rubber bearing device 1 containing a lead plug.
The upper thick reinforcing plate 2 is attached to a structure, for example, a bridge girder via bolts and mounting plates, and the lower thick reinforcing plate 2 is attached to a ground side, for example, a pier, via bolts and mounting plates including anchor bolts. For example, it is used as a bearing having a vibration damping function and a seismic isolation function for a bridge girder.

Then, the laminated rubber bearing device 1 containing lead plugs
In this case, since the intermediate plate 8 surrounds the lead plug 7 so as to restrain the lead plug 7 and is disposed in the rubber layer 5 between the reinforcing layers 4, the restraint of the lead plug 7 during the vibration in the horizontal direction A is performed. The force is improved, and the initial shape of the lead plug 7 can be maintained even after the shear plastic deformation due to the vibration in the horizontal direction A, so that the lead plug 7 can sufficiently exhibit the vibration energy damping effect. In addition, when the thickness of the rubber layer 5 is increased, the lead plug 7 is bent and deformed, so that the lead plug 7 cannot exhibit the vibration energy absorbing ability due to the shearing deformation. Since the lead plugs 8 are provided, the lead plugs 7 are desirably sheared and deformed, so that the lead plugs 7 can exhibit the vibration energy absorbing ability as desired.

Moreover, the laminated rubber bearing device 1 containing a lead plug
Then, the outer diameter Φ of the intermediate plate 8 is substantially equal to the reference value = [φ
^{2 + 12φ} to have a (d-t)] ^1/2, the lead plug 7 securely held in the laminated rubber 6, moreover, reference value such that the facing gap distance d, the lead plug 7 diameter Based on φ and the thickness t of the intermediate plate 8, the outer diameter Φ is optimal for obtaining the above-mentioned effects, and therefore, the plastic deformation of the lead plug 7 is allowed, A reduction in the vibration energy absorbing capacity of the lead plug 7 can be prevented, and the initial required performance can be maintained for a long period of time.

In designing the laminated rubber bearing device 1 containing lead plugs, the outer diameter Φ of the intermediate plate 8 may be determined by calculating from the above reference value.

In the above description, the laminated rubber bearing device 1 with lead plugs provided with four lead plugs 7 has been described as an example. However, the present invention relates to a laminated rubber bearing with lead plugs provided with one lead plug 7. It may be a device or a laminated rubber bearing device containing lead plugs having two or more lead plugs 7.

[0029]

According to the present invention, a stable plastic deformation of a lead plug is allowed, a decrease in the vibration energy absorbing ability of the lead plug can be prevented, and the initial required performance can be maintained for a long period of time. A rubber bearing device can be provided.

[Brief description of the drawings]

FIG. 1 shows a preferred embodiment of the present invention as shown in FIG.
It is a line sectional view.

FIG. 2 is a plan view of the example shown in FIG.

FIG. 3 is a sectional view taken along line III-III of the example shown in FIG.

FIG. 4 is a partially enlarged view of the example shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laminated rubber bearing device containing a lead plug 4 Reinforcement layer 5 Rubber layer 6 Laminated rubber 7 Lead plug 8 Intermediate plate d Face-to-face distance φ Diameter φ Outer diameter t Thickness

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F16F 7/12 F16F 7/12 15/02 15/02 L (72) Inventor Osamu Hasegawa Hajime, Ashikaga-shi, Tochigi Karimachi 1000 Oiles Industrial Co., Ltd. Ashikaga Plant F-term (reference) 2D059 AA37 GG01 3J048 AA02 BA08 BB03 BC09 BE10 DA01 EA38 EA39 3J066 AA01 AA26 BA01 BA03 BB04 BD07 BF01 BF06

Claims (10)

[Claims] 1. A laminated rubber layer obtained by alternately laminating a reinforcing layer and a rubber layer with a spacing distance d between adjacent reinforcing layers, and a reinforcing layer of the laminated rubber and a rubber layer. At least one lead plug having a diameter φ disposed therethrough, and surrounding the lead plug so as to restrain the lead plug, and having an outer diameter Φ and a thickness t disposed in the rubber layer between the reinforcing layers. And an outer diameter Φ of the intermediate plate is a reference value = [φ ² +12
φ (dt)] A laminated rubber bearing device with a lead plug having a value of 0.5 to 1.5 times ^1/2 . 2. The outer diameter Φ of the intermediate plate is equal to a reference value of 0.
2. The laminated rubber bearing device according to claim 1, wherein the laminated rubber bearing device has a value of 9 to 1.1 times. 3. The laminated rubber bearing device according to claim 1, wherein the outer diameter Φ of the intermediate plate substantially has a reference value. 4. A laminated rubber obtained by alternately laminating a reinforcing layer and a rubber layer with an adjacent reinforcing layer having a facing distance d, and a reinforcing layer of the laminated rubber and a rubber layer. At least one lead plug having a diameter φ disposed therethrough, and surrounding the lead plug so as to restrain the lead plug, and having an outer diameter Φ and a thickness t disposed in the rubber layer between the reinforcing layers. And an outer diameter Φ of the intermediate plate is a reference value = [φ ² +12
φ (dt)] A laminated rubber bearing device with a lead plug determined based on ^1/2 . 5. The laminated rubber bearing device with a lead plug according to claim 1, wherein the reinforcing layer and the intermediate plate are vulcanized and bonded to the rubber layer. 6. The laminated rubber bearing device with lead plugs according to claim 1, wherein the reinforcing layer and the intermediate plate are made of a steel plate. 7. The lead layer according to claim 1, wherein the reinforcing layer and the intermediate plate surrounding the lead plug restrain the peripheral surface of the lead plug by an inner peripheral surface closely contacting the peripheral surface of the lead plug. A laminated rubber bearing device containing a lead plug according to claim 1. 8. The reinforcing layer and the intermediate plate surrounding the lead plug are adapted to restrain the outer surface of the lead plug on the inner peripheral surface via a thin rubber layer closely contacting the peripheral surface of the lead plug. 7. The laminated rubber bearing device containing a lead plug according to any one of 1 to 6. 9. A laminated rubber obtained by alternately laminating a reinforcing layer and a rubber layer with a distance d between facing reinforcing layers between adjacent reinforcing layers, and a reinforcing layer and a rubber layer of the laminated rubber. At least one lead plug having a diameter φ disposed therethrough, and surrounding the lead plug so as to restrain the lead plug, and having an outer diameter Φ and a thickness t disposed in the rubber layer between the reinforcing layers. A method of designing a laminated rubber bearing device containing lead plugs, comprising: an intermediate plate having an outer diameter Φ of a reference value = [φ ² + 12φ (d−
t)] A method of designing a laminated rubber bearing device containing lead plugs, which is determined by calculation from ^1/2 . 10. A bridge girder for an expressway or the like supported by the laminated rubber bearing device with a lead plug according to any one of claims 1 to 8.