JPH0384231A - Vibration exempting supporter - Google Patents

Abstract

PURPOSE:To obtain a vibration exempting supporter excellent in vibration exempting function and facilitate its manufacture by setting the thickness of a rubber layer interposed between vertically adjacent cord fabric to be less than 2.0mm as well as the occupied area of fiber cords in a layer including the cord fabric and the occupied volume of the fiber cords in an elastic column body to have specific percentage in relation to the whole layer and the whole elastic column body respectively. CONSTITUTION:Polyester cords 1 are disposed in row, and cotton yarn is woven thereinto so as to manufacture cord fabric 3. This cord fabric 3 is topped with natural rubber so as to form topping cords 4. These topping cords 4 and rubber sheets 5 of varied thickness are alternately laminated to form an elastic column body, and hard flanges 6, 6 made of iron plates are rigidly fixed at both upper and lower ends of the elastic column body, thus manufacturing a vibration exempting supporting body. The thickness of a rubber layer 5 is set to be less than 2.0mm, the occupied area of the polyester cords 1 in the topping cord 4 is to be more than 30% in relation to the whole area of that layer, and the occupied volume of the polyester cords 1 in the elastic column body is to be 10-70% in relation to the whole volume of the elastic column body.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention is a seismic isolation device for supporting structures such as buildings and machinery from below to prevent vibrations caused by earthquakes from being transmitted to the structures. It is related to the support.

(Prior Art) As a seismic isolation support for supporting structures such as buildings and mechanical devices from below, steel plates and rubber plates are alternately stacked (see Japanese Patent Laid-Open No. 62-211471); Also known are mesh-like fabrics and rubber plates alternately laminated.

(Problem to be solved by the invention) However, a structure in which iron plates and rubber plates are stacked alternately,
By reducing the thickness of the individual plates and increasing the number of stacked plates, it is possible to reduce the lateral rigidity and improve the M resistance function, but on the other hand, the number of lamination steps increases and it is difficult to bond the steel plate and the rubber plate. Therefore, the adhesion process is difficult, and air tends to remain between the steel plate and the rubber plate, resulting in poor adhesion.
There was a problem of uneven performance. On the other hand, in the case where mesh-like fabrics and rubber plates are alternately laminated, the thickness of the rubber plates is set to 5 to 20 cm, which is larger than the thickness of the fabric, and when the lateral deformation is large under high load. Because buckling of the rubber plate occurs, it cannot be used for seismic isolation where large lateral deformations occur.Therefore, buildings without lateral deformation! It was used only for vibration isolation of beams, etc.

The present invention provides a seismic isolation support that has an excellent seismic isolation function and is easy to manufacture by using a blind weave made of fiber cords.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides the above-mentioned seismic isolation support in which hard flanges such as metal plates are fixed to the upper and lower surfaces of an elastic columnar body mainly made of rubber. A blind weave having fiber cords as warp threads is arranged on the elastic columnar body in parallel with the upper and lower hard flanges in multiple layers, and the thickness of the rubber layer interposed between the upper and lower adjacent blind weaves is 2.0 mm or less, and The area occupied by the fiber cords in the layer containing the blind weave is 30% or more of the total area of the layer, and the occupied accumulation of the fiber cords in the elastic columnar body is 10 to 70% of the total area of the elastic columnar body. % respectively.

The rubbers constituting the above-mentioned elastic columns include natural rubber, styrene-butadiene rubber, butadiene rubber, nitrile rubber, butyl rubber, halogenated butyl rubber, chloroprene rubber,
These rubbers include polyurethane, ethylene propylene diene rubber, isoprene rubber, plasticized vinyl chloride rubber, Nosolefx, ethylene vinyl acetate rubber, silicone rubber, and chlorinated polyethylene rubber.The hardness of these rubbers after vulcanization is determined by JIS.
-A rubber hardness of 30 to 70 degrees is preferred.

The blind weave arranged in the above rubber is a dense fiber cord made of synthetic fibers such as nylon, polyester, polypropylene, polyethylene, and polyvinyl chloride, recycled fibers such as rayon, and inorganic fibers such as glass fiber and carbon fiber. It is a fabric obtained by coarsely inserting weft threads, which are much thinner than the warp threads, into the warp threads (see Figure 2), and is a sheet consisting essentially of only the above-mentioned warp thread cords. In this bamboo weave, the thickness of the cord is 300
~6000 denier is preferred, and the gap between adjacent cords is set so that the area occupied by the cords is 30% or more of the total area of the blind weave including this gap.

The elastic columnar body of the present invention is manufactured by topping the above-mentioned blind weave with the above-mentioned rubber, laminating only a large number of the obtained topping cords, and then integrating them by vulcanization adhesion. When stacking this topping cord, in order to improve uniformity, the direction of the cord is changed at a desired angle, for example, 9
The layers can be stacked by being sequentially shifted by 0 degrees or by 45 degrees.

It is also possible to alternately laminate the above-mentioned topping cord and the above-mentioned rubber plates or sheets and integrate them by vulcanization adhesion. However, the thickness of the above-mentioned rubber plate or rubber sheet, that is, the thickness of the rubber layer formed between the above-mentioned blind weaves, is 2.0 mm or less, preferably 1.0 mm or less.
It is set to 0 mm or less. In addition, the volume occupied by the cord in the above elastic columnar body is 10% of the total volume of the elastic columnar body.
Above, it is preferably set to 20 to 70%.

The hard flanges stacked on both the upper and lower ends of the elastic columnar body are made of metal such as iron, aluminum, copper, stainless steel, polystyrene, polyethylene, polypropylene, ABS, etc.
Thermoplastic resins such as polyvinyl chloride, polymethyl methacrylate, polycarbonate, polyacetal, and nylon,
It is a board made of thermosetting resin such as phenol resin, urea resin, unsaturated polyester resin, and epoxy resin, other ceramics, FRP, wood, etc. Its preferable thickness is 1 to 5 mm, and its hardness is JIS- Preferably, the A rubber hardness is 95 degrees or more. This hard 7 lunge can be stacked on both the upper and lower surfaces of the elastic columnar body and fixed with an adhesive, and can also be bonded to both the upper and lower surfaces when the topping cord, etc. is vulcanized. They can be stacked and vulcanized and bonded at the same time.

(Function) When the above seismic isolation support is interposed between any structure and its foundation to support the structure, the elastic columns of the seismic isolation support will absorb both longitudinal and lateral vibrations. Absorb. By arranging the blind weave on the elastic columnar body parallel to the hard flanges at both ends and in multiple layers, the vertical rigidity is improved to the same level as a laminate of steel plates and rubber plates, making it possible to withstand high loads. At the same time, the lateral rigidity is reduced, making it possible to absorb large lateral vibrations.Moreover, the thickness of the blind weave is thinner than that of conventional mesh-like fabrics. When the thickness of the wefts is equal, the thickness of the blind weave is about 1/3 of the thickness of the mesh-like fabric, so the distance between the vertically adjacent blind weaves is narrowed to reduce the thickness of the rubber layer between the blind weaves. It can be made thinner, and therefore the longitudinal stiffness can be further increased while the lateral stiffness is kept small, and buckling under high loads can be prevented.

In addition, in order to support the structure, the seismic isolation support body is said to preferably have high vertical rigidity and low horizontal rigidity, and the ratio of the horizontal rigidity to the vertical rigidity is as small as possible. The seismic isolation support has a thickness of 2.0 mm or less for the rubber layer between the vertically adjacent blind weaves, and an area occupied by the fiber cords in the layer containing the blind weave of 30 mm relative to the total area of the above layers.
% or more, and since the volume occupied by the fiber cord in the elastic columnar body is set to 10 to 70% of the total volume, particularly excellent seismic isolation performance can be obtained. On the other hand, if the thickness of the rubber layer is greater than 2.0 mm, the rubber layer is too thick and the longitudinal stiffness decreases, resulting in an excessive ratio of lateral stiffness to longitudinal stiffness, and the blind weave becomes too thick. When the occupied area ratio of the fiber cords in the containing layer is less than 30% and when the occupied volume ratio of the fiber cords in the elastic columnar body is less than 10%,
In either case, the longitudinal stiffness decreases and the ratio of lateral stiffness to longitudinal stiffness becomes excessive, and if the above-mentioned occupied volume ratio exceeds 70%, it becomes necessary to make the fiber shape non-circular, making manufacturing difficult. Become.

(Example) Two polyester filament yarns of 1,500 denier were brought together and heated to obtain a polyester cord with a diameter of 0.65 mm.As shown in FIG.
Arranged at a density of 2 threads/inch, 20 count cotton threads 2 are inserted to weave a blind weave 3, and natural rubber (
Topped with JIS-A rubber hardness 40 degrees) to a thickness of 0.
The topping cord 4 (see Fig. 1) and the sheets 5 of various thicknesses made of the above-mentioned rubber are alternately laminated and vulcanized to obtain a topping cord of 90 mm in outer diameter and 2 mm in inner diameter.
A tubular elastic columnar body of 0 mm 1 height 90 am is formed, and a hard flange 6 made of an iron plate with a thickness of 10 mm is attached to the upper and lower ends of the columnar body.
．． 6 was fixed to produce seismic isolation supports of Examples 1 to 4 and Comparative Examples 1 and 2. In addition, the iron plate 19 with a thickness of 1.2 mm
rubber plate with a thickness of 3.0 mm (JIS-A rubber hardness 4
A seismic isolation support of Comparative Example 3 having the same size as above was manufactured by alternately stacking 20 pieces (0 degrees). The longitudinal and lateral rigidities of these seismic isolation supports were measured, and the ratios of the lateral and longitudinal rigidities were compared. The results are shown in Table 1 below. In the table, 1 indicates lateral stiffness, and K indicates longitudinal stiffness.

(Hereinafter, blank) Table 1 As is clear from the table above, the thickness of the rubber layer should be 2 mm or less.
Preferably, by setting the thickness to less than l■, performance comparable to that of the seismic isolation support of Comparative Example 3 in which iron plates and rubber plates are alternately laminated can be obtained.

Next, as shown in FIG.
Mesh fabric 1 with a thickness of 1.5 inches arranged at a density of inches
2 was woven and topped with the same rubber as in the previous example to obtain a topping cord 13 (fourth cord) with a thickness of 1.5 wa.
(see figure) and laminated alternately with rubber plates 14 in the same manner as in the above-mentioned Examples to produce seismic isolation supports of Comparative Examples 4 to 6, and the ratio of the lateral stiffness to the longitudinal stiffness was measured. The results are shown in Table 2.

Table 2 As is clear from the above table, when mesh fabrics are used, the ratio of lateral stiffness to longitudinal stiffness is large even if the upper and lower adjacent mesh fabrics are placed close together and the thickness of the rubber layer between them is zero. Therefore, it is not preferable as a support for seismic isolation.

Furthermore, in the seismic isolation supports of Examples 1 to 4, the arrangement density of the cords 1 of the blind weave 3 was variously changed, that is, the area occupied by the cords 2 in the layer containing the blind weave 3 was variously changed. Seismic isolation supports of Comparative Example 7 and Examples 5 to 7 were manufactured, and the ratios of lateral stiffness and longitudinal stiffness were compared. However, the thickness of the rubber layer was all set to zero.

The results are shown in Table 3.

As is clear from the table above, it was confirmed that by setting the cord occupancy rate to 30% or more, performance comparable to or higher than that of the seismic isolation support of Comparative Example 3 using iron plates could be obtained.

(Effects of the Invention) This invention provides a seismic isolation support in which hard flanges such as metal plates are fixed to the upper and lower surfaces of an elastic columnar body mainly made of rubber. Since the fabric is arranged parallel to the upper and lower rigid flanges in multiple layers, it is possible to reduce the thickness of the rubber layer compared to the conventional laminated mesh fabric and rubber plate, which allows it to withstand high loads. By eliminating the occurrence of buckling at the bottom, the same level of seismic isolation performance as a conventional seismic isolation support made of alternately laminated steel plates and rubber plates can be obtained, and the vulcanization process after lamination makes the blind weave into an elastic columnar shape. Since it is integrated into the body, it is easier to manufacture than the above-mentioned iron plate.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of an embodiment of the present invention, Fig. 2 is a perspective view of a blind weave, Fig. 3 is a sectional view of a conventional mesh fabric, and Fig. 4 is a seismic isolation support using the above mesh fabric. It is a cross-sectional view of the body. l: Cord, 2: Weft, 3: Blind weave, 4: Topping cord, 5: Rubber layer, 6: Hard flange.

Claims (1)

[Scope of Claims] [1] In a seismic isolation support in which hard flanges such as metal plates are fixed to the upper and lower surfaces of an elastic columnar body mainly made of rubber, a blind having a fiber cord as a warp on the elastic columnar body is provided. The weave is arranged parallel to the upper and lower hard flanges in multiple layers, the thickness of the rubber layer interposed between the upper and lower adjacent blind weaves is 2.0 mm or less, and the area occupied by the fiber cord in the layer containing the blind weave is 30% or more of the total area of the above layer,
A support for seismic isolation, characterized in that the volume occupied by the fiber cords in the elastic columnar body is 10 to 70% of the total volume of the elastic columnar body.