JPH06137378A - Periphery constrained type laminated rubber bearing - Google Patents

Abstract

PURPOSE:To secure the parallelism of hard plates forming a base body inserted and filled into the cylindrical hollow parts of a constraint body. CONSTITUTION:A periphery constrained type laminated rubber bearing is formed of a constraint body 4 with hard plates 1 and rubber elastic plates 2 laminated alternately so as to form a cylindrical hollow part 3 opened to both ends in the laminated direction, and a column like base body 7 inserted and filled into the cylindrical hollow part 3 and provided with hard plates 5 and viscoelastic plastic bodies 6 laminated alternately. The outer peripheral part of the base body 7 is covered with a vulcanized rubber elastic body 13, and the rubber elastic body 13 and the outer peripheral parts 5a of the hard plates 5 projecting from the outer periphery of the viscoelastic plastic bodies 6 are laminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a perimeter restraint type laminated rubber bearing, and more specifically, due to earthquakes, mechanical vibrations, traffic vibrations, etc., structures (buildings, bridges, tanks, etc.) and equipment (electronic computers, Medical equipment, safety equipment, precision manufacturing equipment, analysis and analysis equipment, etc.], and a peripherally constrained laminated rubber bearing used for seismic isolation and vibration isolation bearings that reduce the acceleration input to arts and crafts.

[0002]

2. Description of the Related Art As a seismic isolation / vibration support for reducing acceleration input to structures, various devices, arts and crafts, there is, for example, a perimeter restrained laminated rubber support. This peripherally constrained laminated rubber bearing is a constrained body in which a hard plate such as a steel plate and a soft rubber-like elastic plate having a small compression set are alternately laminated, and a cylindrical hollow portion having openings at both ends in the laminating direction is formed. And a columnar mother body that is inserted and filled in the cylindrical hollow part, and is interposed between the lower structure and the upper structure so that the upper structure can swing horizontally. In order to protect the upper structure from the destructive force of the earthquake by reducing the input acceleration such as the earthquake.

The applicant of the present invention has previously proposed this type of peripherally constrained laminated rubber bearing [JP-A-64-58730 and JP-A-3-163231].

In the invention disclosed in Japanese Unexamined Patent Publication No. 64-58730, a mother body having a structure in which a hard plate and a viscoelastic body are alternately laminated is used as a mother body to be inserted / filled in the cylindrical hollow portion of the restraint body. On the other hand, in the invention disclosed in Japanese Unexamined Patent Publication No. 3-163231, a structure in which a hard plate and a viscoelastic body are alternately laminated as the base body and has a structure having an excessive volume larger than that of the cylindrical hollow portion is provided. It is disclosed.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention By the way, the above-mentioned JP-A-64-58730 and JP-A-3-163231.
In the peripherally constrained laminated rubber bearing disclosed in Japanese Patent Publication, the material to be placed between the hard plates of the mother body that is inserted / filled into the cylindrical hollow portion of the restraint body is based on the experimental results of the applicant thereafter. Based on the above, a material having high dynamic rigidity and a large tan δ showing damping performance, and moreover, it is hard to return to its original shape or does not return to its original shape, that is, viscous body, viscoelastic body, elastoplastic body or plastic body [hereinafter, It has been found that the term "viscoelastic-plastic body" is preferable.

However, as described above, the rigidity is high,
In addition, the viscoelastic-plastic material, which is a material that has a large tan δ and is difficult to return to its original shape or does not return to its original shape, is extremely inferior in its ability to restore the shape, and generally exhibits fluidity over a long time axis. Therefore, when the laminated rubber bearing is used for a long period of time and horizontal deformation is repeatedly applied to the mother body inserted and filled in the tubular hollow portion of the restraint body, the viscoelastic-plastic body in the mother body causes a fluid phenomenon, Due to the fluid phenomenon, it becomes difficult to secure parallelism between the hard plates. In some cases, the moving viscoelastic-plastic body moves to the layer of the adjacent viscoelastic-plastic body, and then the recovery is significantly delayed. There was a problem that the positional relationship with the plate was distorted, and as a result, the horizontal shear characteristics of the laminated rubber bearing fluctuate rapidly.

Therefore, the present invention has been proposed in view of the above problems, and an object of the present invention is to determine the parallelism of a hard plate constituting a mother body inserted / filled in a cylindrical hollow portion of a restraining body. It is to provide a perimeter restraint type laminated rubber bearing which can be secured.

[0008]

As a technical means for achieving the above object, the present invention is a cylindrical hollow structure in which hard plates and rubber-like elastic plates are alternately laminated and open at both ends in the laminating direction. In a peripherally constrained laminated rubber bearing comprising a constraining body having a portion formed therein and a columnar base body which is inserted / filled in the cylindrical hollow portion and in which second hard plates and viscoelastic-plastic bodies are alternately laminated, The outer peripheral portion of the matrix was covered with the vulcanized second rubber-like elastic body, and the outer peripheral portion of the second hard plate protruding from the outer periphery of the viscoelastic-plastic body and the rubber-like elastic body were laminated. It is characterized by

[0009]

In the peripherally constrained laminated rubber bearing according to the present invention, the outer peripheral portion of the base body is composed of the vulcanized second rubber-like elastic body, and the rubber-like elastic body and the viscoelastic-plastic body are eroded from the outer periphery. Since the outer peripheral portion of the ejected second hard plate is laminated, even if the mother body is repeatedly subjected to horizontal deformation due to long-term use,
It is possible to suppress undesired flow of the viscoelastic-plastic body, reliably position-control the second hard plate by the second rubber-like elastic body, and ensure the parallelism thereof.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a peripherally constrained laminated rubber bearing according to the present invention will be described with reference to FIGS.

FIG. 1 shows an actual use state of the peripherally constrained laminated rubber bearing according to the present invention, in which a plurality of hard plates (1) and rubber-like elastic plates (2) are alternately laminated and at both ends in the laminating direction. A restraint body (4) having an open tubular hollow portion (3), and a second hard plate (5) and a viscoelastic-plastic body (6) inserted and filled in the tubular hollow portion (3). And a columnar matrix (7) in which the above are alternately laminated. The hard plates (1) and (5) are made of a highly rigid member such as a steel plate, and the rubber-like elastic plate (2) is made of a high damping rubber. The viscoelastic-plastic body (6) includes, for example, natural rubber and its dielectric, various synthetic rubbers and rubber-like viscoelastic bodies such as rubber-like plastics, and other viscous bodies, elastic-plastic bodies and plastic bodies as described above. Collectively.

On the upper and lower surfaces of the restraint body (4), annular upper and lower connecting steel plates (8) and (9) made of a hard material are attached, and the hard plate (1) and the rubber-like elastic plate (2) are attached. The upper and lower connecting steel plates (8) and (9) are integrated by, for example, applying an adhesive to each joint surface during vulcanization or molding. On the other hand, hard upper and lower connecting steel plates (10) (11) are also attached to the upper and lower surfaces of the base body (7). In the figure,
Reference numeral (12) is a coated rubber attached to the outer periphery of the restraining body (4).

The feature of the present invention resides in the mother body (7) inserted and filled in the cylindrical hollow portion (3) of the restraining body (4). Specifically, as shown in FIG. 2, the base body (7) has its outer peripheral portion covered with a second rubber-like elastic body (13) such as vulcanized high-damping rubber, and has the above-mentioned viscoelastic-plastic property. It has a structure in which an outer peripheral portion (5a) of a hard plate (5) protruding from the outer periphery of a body (6) and the rubber-like elastic body (13) are laminated. It is preferable that the rubber-like elastic body (13) and the outer peripheral portion (5a) of the hard plate (5) are bonded to each other, but if they are not bonded, there is no problem in terms of their functions. As the physical properties of the rubber-like elastic body (13), the rubber hardness is 40 to 70 [JIS A] and the elongation at break is 400 to 900%, preferably 600 to 900%, and the rubbery elastic plate (2) is not always required. It does not have to be the same rubber material as.

Here, when the hardness is less than 40,
The force for restraining the viscoelastic-plastic body (6) becomes weak and the intended purpose cannot be achieved. Conversely, if the hardness is larger than 70, the hard plate (5) will be deformed during large deformation, and as a result, However, there is a problem that the rubber layer spacing cannot be maintained and the rigidity of the bearing increases.

Further, if the breaking elongation is less than 400%, it becomes impossible to follow the shear deformation of the entire bearing, and conversely, if the breaking elongation is more than 900%, no problem occurs, but in terms of material. As for the characteristics, the upper limit is usually about 900%. When used as a seismic isolation / anti-vibration bearing, a material with a large breaking elongation is particularly preferable.

When the mother body (7) is actually manufactured, as shown in FIG. 3, in order to position each constituent member at the time of manufacturing, a through hole (14) is formed in the central portion and the through hole (14) is formed. Vulcanize with the core rod inserted in 14). After the vulcanization and molding, the core rod is pulled out, and the through hole (14) is filled with an injecting material (15) such as a viscoelastic-plastic material or a rubber-like elastic material.

The base (7) may be cylindrical or prismatic in shape. In addition, throughout the drawings, the outer peripheral surface is formed in a tapered shape so as to expand from the upper side to the lower side, but it does not necessarily have to be tapered, and the upper end and the lower end have the same diameter. May be However, due to the tapered shape as described above, it is possible to obtain a good fitting state between the base body (7) and the restraining body (4), and also in manufacturing the same, the work of fitting them together The property is also improved.

As described above, the outer peripheral portion of the base body (7) is composed of the vulcanized rubber-like elastic body (13), and the outer periphery of the rubber-like elastic body (13) and the viscoelastic-plastic body (6) is eroded. Since the outer peripheral portion (5a) of the protruding hard plate (5) is laminated, even if the base body (7) is repeatedly subjected to horizontal deformation due to long-term use, tan δ is large and it is difficult to restore the original shape. Unwanted flow of visco-elastic plastic body (6) can be suppressed, and rubber-like elastic body (13)
As a result, the position of the hard plate (5) can be reliably regulated and its parallelism can be secured.

With respect to the restraint body (4) having the above structure,
As shown in Fig. 4, the mother body (7) having a volume larger than that of the tubular hollow portion (3) is inserted and arranged in the tubular hollow portion (3), and in actual use, the parent body (7) is placed in the tubular hollow portion (3). An excessively large volume of the mother body (7) is press-fitted by an appropriate means. In that state, the upper and lower connecting steel plates (8) (9) of the restraining body (4) are bolted to the upper and lower mounting steel plates (16) (17) to attach the base body (7) to the tubular hollow part (3). Hold the press-fitted state and interpose the laminated rubber bearing between the upper and lower structures (18, 19) to bolt the upper and lower mounting steel plates (16) (17) to the upper and lower structures (18) (19). Tighten [see Figure 1].

In this actual use condition, the relative position of the hard plate (1) of the restraint body (4) and the hard plate (5) of the base body (7) in the stacking direction is determined by the horizontal characteristic of good bearing. Must be matched with each other to ensure However, the number of laminated hard plates (5) of the mother body (7) does not necessarily have to be the same, and may be smaller than that. In addition, the thickness of the hard plate (5) of the matrix (7) is set to be almost the same as that of the hard plate (1) of the restraint body (4), especially when the damping performance of the viscoelastic-plastic body (6) is improved. Can be larger than the hard plate (1) of the restraint body (4).

As described above, the mother body (7) inserted into the tubular hollow portion (3) of the restraining body (4) has the tubular hollow portion (3).
It has an excessively large volume (see FIG. 4), and the mother body (7) is press-fitted into the hollow cylindrical portion (3) during actual use (see FIG. 1). Here, the over-volume integral of the mother body (7) is set as follows.

That is, in the mother body (7), the inner surface area of the portion corresponding to the rubber-like elastic plate (2) in the inner surface area of the cylindrical hollow portion (3) has a layer thickness of 5 of the rubber-like elastic plate (2). It has a volume which is larger than the volume of the cylindrical hollow portion (3) by the volume integral multiplied by the length of -60%.

As a result, in actual use, the mother body (7) press-fitted into the cylindrical hollow portion (3) of the restraining body (4) has a rubber-like elastic body (which constitutes the outer peripheral portion thereof as shown in FIG. 5). 13) bulges out to the rubber-like elastic plate (2) of the constraining body (4) by the above excessive volume, and the bulging (20) between the hard plates (1) of the constraining body (4) causes the mother body (7) ) And the restraining body (4) can be mechanically fitted in good condition, and the damping performance can be improved.

Specifically, the rubber-like elastic body (1
The total volume of the bulge of 3) is the over-integral of the matrix (7), and when the length of the bulge (20) is d as shown in the enlarged view of FIG. 5, the shaded parts Va and Vb in the figure are shown. Are averaged so as to cancel each other out, and the average length dav of the bulge (20) thus obtained is set. Therefore, the total volume of the bulge (20) is the average length dav of the bulge (20) to the inner surface area of the inner surface area of the cylindrical hollow portion (3) corresponding to the rubber-like elastic plate (2). It will be multiplied. This bulge (2
The total volume of (0) is an excessive volume of the matrix (7), and the average length dav of the bulge (20) is 5 to 60% of the further thickness of the rubber elastic plate (2) described above. And a length of 10 to 50% is particularly preferable.

The average length dav of the bulge (20) is
If it is smaller than 5% of the thickness of the rubber elastic plate (2),
The bulge (20) becomes small, it becomes difficult to obtain a good mechanical fitting state with the restraining body (4), and the damping performance cannot be improved. Also, the average length d of the bulge (20)
If av is greater than 60% of the thickness of the rubber elastic plate (2), the bulge (20) becomes too large and the internal strain of the restraint body (4) increases, causing fracture during horizontal shear deformation. The strain decreases and the rubber-like elastic plate (2) easily breaks.

[0026]

EFFECTS OF THE INVENTION According to the peripherally constrained laminated rubber bearing according to the present invention, even if the base body is repeatedly subjected to horizontal deformation due to long-term use, undesired flow of the viscoelastic-plastic body can be suppressed and the rubber can be prevented. -Like elastic body can reliably position the hard plate and ensure its parallelism, so the damping ratio is high and a stable horizontal reaction force is exhibited even if repeated large horizontal deformation is applied. It is possible to realize seismic isolation / anti-vibration bearings with various characteristics.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a peripherally constrained laminated rubber bearing according to the present invention, showing the laminated rubber bearing in an actual use state.

FIG. 2 is a cross-sectional view showing a mother body inserted into the cylindrical hollow portion of the restraint body of FIG.

FIG. 3 is a cross-sectional view showing a mother body that is actually used in manufacturing the laminated rubber bearing of FIG.

FIG. 4 is a sectional view of the laminated rubber bearing showing a state before the mother body is press-fitted into the hollow cylindrical portion of the restraining body.

[Fig. 5] In the laminated rubber bearing in the actual use state of Fig. 1,
Enlarged cross-sectional view of essential parts showing a mechanically fitted state of the restraint body and the mother body

[Explanation of symbols]

 1 Hard plate 2 Rubber-like elastic plate 3 Cylindrical hollow part 4 Restraint body 5 Hard plate 5a Outer part of hard plate 6 Viscoelastic-plastic body 7 Base material 13 Rubber-like elastic body

Claims (1)

[Claims] 1. A restraint body in which hard plates and rubber-like elastic plates are alternately laminated, and a tubular hollow portion having openings at both ends in the laminating direction is formed, and the tubular hollow portion is inserted and filled. 2. A peripherally constrained laminated rubber bearing comprising a columnar base body in which a hard plate and a viscoelastic-plastic body are alternately laminated, in which the outer peripheral portion of the base body is covered with a vulcanized second rubber-like elastic body. , The second leached from the outer periphery of the viscoelastic-plastic body
2. A peripherally constrained laminated rubber bearing characterized in that the outer peripheral portion of the hard plate and the rubber-like elastic body are laminated.