JP5009431B1 - Construction method of horizontal restoring spring device for seismic isolation structure - Google Patents

Abstract

A horizontal restoring spring device for a base-isolated structure having a low spring constant capable of making a base-isolated structure such as a structure or equipment having an extremely small total weight and having a large horizontal deformation performance of several tens of centimeters or more. Provide a construction method.
A rubber block unit having end steel plates at both upper and lower ends of a rubber block composed of a small rubber is manufactured. Four or more rubber block units are arranged on the same level, and a rubber column hierarchy is formed by integrating them with a connecting plate. A plurality of the rubber column layers are stacked in the vertical direction to constitute a multi-layered rubber column frame.
[Selection] Figure 4

Description

  The present invention relates to a seismic isolation device that can safely protect a structure from an earthquake, and particularly to a seismic isolation device mainly intended for light-weight items such as small-scale structures and equipment / exhibits with a small weight. The present invention relates to a construction method of a horizontal restoring spring device for a seismic structure.

  The seismic isolation structure can reduce the shaking of the structure itself against strong earthquake motion during a large earthquake, so that not only the structural structure of the building but also the earthquake resistance of the entire building, including the internal housing such as furniture and equipment Can be increased.

  The seismic isolation structure was realized from large heavy structures such as buildings and bridges with the practical use of laminated rubber. Attempts have also been made to apply it. In addition to various laminated rubber-based seismic isolation devices, various seismic isolation devices such as slip-type seismic isolation devices and rolling-type seismic isolation devices have been developed.

  The feature of the seismic isolation device for lightweight structures is that the supporting weight is easy because the supporting weight is small, while the required deformation performance is the same as that of a large structure. In order to support a small weight, a small isolator such as a laminated rubber or a sliding bearing may be used, but securing a large horizontal deformation performance with a small laminated rubber isolator is a difficult problem.

  In addition, in order to exert an excellent seismic isolation effect for lightweight structures, it is necessary to extend the seismic isolation cycle (tangential cycle with restoring material such as laminated rubber) to at least 4 seconds, ideally about 6 seconds. However, since the weight of the structure is small, the horizontal spring constant of the restoration material needs to be extremely small, and the cross-sectional area of the rubber body constituting the spring as the restoration material needs to be reduced.

  For this reason, there is one that tries to use a rubber string-shaped spring without using laminated rubber (see Patent Document 1). In addition, there is a rubber body with a hole in the rubber body (see Patent Document 2). Similarly, there is also a combination of spherical bearings that support vertical loads inside the laminated rubber body with a large hole in the laminated rubber body to reduce the cross-sectional area of the rubber body (spring) as a ring-shaped laminated rubber (patent) Reference 3).

  Moreover, there exists a thing which tries to ensure a big horizontal deformation with a small laminated rubber as a multistage laminated rubber which piled up the small laminated rubber body in the up-down direction (refer patent document 4 and 5).

Japanese Patent Laid-Open No. 2003-307045 JP 2004-028296 A JP-A-11-125310 JP 2004-28302 A JP 2001-263416 A

  However, the conventional techniques as described above have their respective problems, and the present situation is that a perfect lightweight structure restoration device has not been realized.

  Although the thing of patent document 1 can provide a restoring spring comparatively simply according to the weight of an object structure, since a spring characteristic can be exhibited only with respect to tensile force, two sets of positive and negative sides to one direction It is necessary to arrange a spring, and there are difficulties in arrangement and usability. Further, when the spring is deformed in the compression direction, the spring itself may be bent or the mounting portion may collide and interfere.

  Patent Documents 2 and 3 have a thin rubber film or ring-shaped rubber body, so that when large deformation occurs, the rubber film (ring) surface causes a digging phenomenon, the spring characteristics collapse, There is a difficulty that does not become a restoring force characteristic.

  The multi-stage type laminated rubber described in Patent Documents 4 and 5 can ensure a large horizontal deformation performance by increasing the number of the laminated stages. However, even though it is small, a large number of laminated rubbers are required and a complicated device is obtained. The overall shape of the device is quite large, which is disproportionate to small lightweight structures, often resulting in difficulties in actual placement. In addition, the cost is high, and there is a serious defect that it is not economically realistic.

  Moreover, the object structure of patent documents 2-5 is a detached house etc., and even if it is a lightweight structure, it is a premise that the total weight is about several tens tons to a hundred tons, and the total weight is 20 If the total weight is less than 1 ton in extreme cases, the appropriate spring constant cannot be designed. Become.

That is, the problems to be solved by the present invention are as follows.
(1) It is possible to provide a horizontal restoring spring having a very small spring constant that is about several seconds (5 to 6 seconds) of seismic isolation even when the total weight of the object is 20 tons or less, and in some cases 1 tons or less. .
(2) Since the amount of deformation required for the seismic isolation device does not depend on the size and weight of the structure, large horizontal deformation of several tens (50 to 60) cm or more in one amplitude should be allowed.
(3) The system shape should not be excessive with a simple system.
(4) It can be provided at low cost.

  The first object of the present invention is to “construct a horizontal restoring spring device for a seismic isolation structure that can realize a restoring device having the above-mentioned conditions that is indispensable when a lightweight structure is realized as a high-performance seismic isolation structure”. Is to provide a "method".

  The second object of the present invention is to provide a construction method of a horizontal restoring spring device for seismic isolation structure that can exhibit restoring performance even under special circumstances. That is, in a very special environment, particularly in a place where extremely strong magnetism exists, a magnetic force is generated in the ordinary steel material having magnetism. For this reason, there is a possibility that an unnecessary horizontal force or vertical force is always applied to the superstructure due to the magnetic force, an intermediate rubber column layer of the device is deformed, or the entire device is deformed. is there. As a result, the restoring force characteristic is affected, and there is a possibility that the normal restoring force characteristic cannot be exhibited. An object of the present invention is to provide a “method for constructing a horizontal restoring spring device for a seismic isolation structure” that can normally exhibit a predetermined restoring force characteristic even under such a special environment.

The present invention adopts the following configuration in order to solve the above points.
<Configuration 1>
A rubber-like elastic body block (hereinafter referred to as “rubber block”) having a height / width elevational surface shape (hereinafter referred to as “aspect ratio”) of 1 or more and 2 or less is created, and is formed on both upper and lower end surfaces of the rubber block. A rubber block unit is produced by integrating end steel plates having the same planar dimensions as the rubber block by adhesive bonding or vulcanization bonding, and at least four of the rubber block units are arranged in a plane at a distance from each other. A connecting plate for connecting the separately arranged rubber block units on the same plane (same height) is arranged above and below the rubber block unit, and the rubber block unit is fitted on both the upper and lower surfaces of the connecting plate. A concave recess is provided, and the upper and lower end portions of the rubber block unit are inserted into the concave recess of the connecting plate, and the contact surfaces of both are bonded and integrated. The rubber block unit integrated with the rubber block unit on the upper side is constructed of a multi-layered rubber column frame in which two or more layers are stacked in the vertical direction, and the rubber block unit is disposed at both upper and lower ends of the multi-layered rubber column frame. A method for constructing a horizontal restoring spring device for a seismic isolation structure, wherein a fixing base plate having a concave recess that fits with the base plate is disposed and integrated by adhesion.

<Configuration 2>
Create a rubber block with a vertical aspect ratio of 1 or more and 2 or less, and glue or vulcanize the end steel plates with the same plane dimensions as the rubber block on the upper and lower end faces of the rubber block. A rubber block unit integrated with each other is created, and at least four of the rubber block units are arranged in a plane at a distance from each other, and the rubber block units separated and arranged above and below the rubber block unit are on the same plane (the same A connecting plate to be connected at a height), the upper and lower surfaces of the connecting plate are flat surfaces, and the contact surfaces of the rubber block unit and the upper and lower connecting plates are bonded and integrated to form four or more rubber blocks. A multi-story rubber column structure is constructed by stacking two or more layers of rubber column layers integrated with the unit and connecting plate in the vertical direction. A Mino upper and lower ends, method for constructing a base isolation structure for a horizontal restoring spring device, characterized in that the integrated by bonding with the rubber block units by arranging the fixing base plate.

<Configuration 3>
A rubber block having an elevational aspect ratio of 1 or more and 2 or less is prepared, and an end steel plate having a plane size slightly larger than that of the rubber block and having a circular plane is bonded or added to the upper and lower end faces of the rubber block. A rubber block unit integrated by sulfur bonding is created, and at least four of the rubber block units are arranged in a plane at a distance from each other, and the rubber block units separately disposed above and below the rubber block unit are on the same plane. A connecting plate to be connected at the same height is arranged, and male screws in the reverse rotation direction are cut on the side surfaces of the steel plates at the upper and lower ends of the rubber block, and the connecting plate is adapted to the male screw of the rubber block. Cutting the female screw, rotating the rubber block around the vertical axis, and screwing it to the connecting plate, A multi-layered rubber column framework is constructed by stacking two or more layers of rubber column layers integrated with the mblock unit and connecting plate in the vertical direction, and the fixing base plate has female screws at the upper and lower ends of the multi-layered rubber column framework. And constructing a horizontal restoring spring device for a seismic isolation structure, wherein the rubber block unit is integrated with the rubber block unit by screw joining.

<Configuration 4>
A rubber block having an elevational aspect ratio of 1 or more and 2 or less is prepared, and an end steel plate that is larger than the rubber block and protrudes on the plane is bonded or bonded to the upper and lower end faces of the rubber block. A rubber block unit integrated by sulfur bonding is created, and at least four of the rubber block units are arranged in a plane at a distance from each other, and the rubber block units separately disposed above and below the rubber block unit are on the same plane. A rubber column in which a connecting plate to be connected at the same height is arranged, the connecting plate and the end steel plate are integrated by bolt joining or welding joining, and four or more rubber block units and a connecting plate are integrated. Build a multi-story rubber column structure with two or more layers stacked in the vertical direction. Fixing bases on the top and bottom ends of the multi-story rubber column structure Rate place, method for constructing a base isolation structure for a horizontal restoring spring device, characterized in that the integrated by bolting or welding.

<Configuration 5>
In the construction method of the horizontal restoring spring device for a seismic isolation structure according to Configuration 4, the shape of the end steel plates to be bonded to the upper and lower ends of the rubber block is increased, the thickness of the portion contacting the rubber block is increased, and the outer peripheral portion is A method for constructing a horizontal restoring spring device for a seismic isolation structure, characterized in that a plate thickness of a protruding portion is reduced and a surface in contact with a connecting plate is flattened.

<Configuration 6>
For all steel plate / steel materials used in any of the horizontal restoring spring devices for seismic isolation structures described in Structure 1 to Structure 5, austenitic stainless steel such as SUS304 and SUS305, duplex stainless steel, and other stainless steels A method for constructing a horizontal restoring spring device for a base-isolated structure, using super stainless steel, aluminum alloy, or other non-magnetic metal.

<Effect of Configuration 1>
First, by adopting a rubber block, which is a lump of rubber alone, instead of laminated rubber as a basic element that develops a restoring force, the apparatus components can be greatly simplified and the cost can be reduced.
In addition, the rubber block can be manufactured not only easily and at a low cost, for example, with a very small diameter and small rubber block with a diameter of 3 cmφ, and can realize an extremely small horizontal spring constant, so that it is super lightweight with a total weight of 1 ton or less. This makes it possible to manufacture a restoration material that can be applied to any object.

  In order to construct a restoring force device by combining the rubber blocks, end steel plates are attached to the upper and lower ends of the rubber block, and the upper and lower end steel plates and the connecting plate are bonded using a metal adhesive. A rubber column hierarchy having four or more levels of rubber block units is configured, and a multi-level rubber column framework is formed by stacking a plurality of levels in the vertical direction.

In order to ensure a large horizontal deformation performance, it is necessary to secure a rubber column height of 33% to 40% or more of the target horizontal displacement of the entire apparatus.
That is, if 40% of the target horizontal displacement is secured as the height of the rubber column, the target horizontal displacement can be cleared at a shear deformation angle of 250% of the rubber column, and the target horizontal displacement can be achieved at a shear deformation angle of about 300% when the rubber column height is 33%. To reach. The critical shear deformation angle at which the rubber column breaks is generally considered to be around 400%, but considering the deterioration of the rubber material and the hardening characteristics of the restoring force (conspicuous when γ ≧ 300%), etc., the horizontal shear deformation angle It should be avoided to apply a deformation of 300% or more in terms of shear strain to the restoring spring device.

In order to efficiently secure and realize the required rubber height, in the present invention, an aspect ratio (height / width) of 1 to 2 is used as the vertical shape of the rubber block which is a basic element of the apparatus. adopt.
By making the height of the rubber block more than the width, securing the height of the rubber layer is significantly more efficient than the laminated rubber, and the cost reduction effect is dramatically improved, but the drilling phenomenon under large horizontal deformation In order to avoid this, a restriction of an aspect ratio of 2 or less is provided.
The planar shape of the rubber block may be circular or square, and may be other shapes such as a rectangle in special cases. In this case, the aspect ratio is evaluated by the length of the short side.

  At this time, the shape factor S1 (Shape Factor: constraint area / free surface area) is S1 = 0.25 (aspect ratio = 1) to 0.125 (aspect ratio = 2), and the shape factor S1 of a normal laminated rubber The value becomes as small as 1/100 to 1/300 of approximately 20 to 40, which means that the apparatus can simplify and simplify the rubber body accordingly.

However, as the aspect ratio is further increased beyond 2, the shape approaches the characteristics close to the string shape of Patent Document 1, so that the digging phenomenon and restoring force characteristics during horizontal deformation show nonlinearity. Therefore, it is impossible to increase the aspect ratio indiscriminately.
The rubber block having such a shape can be used in the present invention only for the provision of a horizontal restoring spring for the purpose of the present apparatus, which is support of vertical load aimed at by conventional laminated rubber and multi-stage laminated rubber. It can be regarded as an effect that can be obtained as a reward for abandoning the function.

<Effect of Configuration 2>
With the recent development of bonding technology, metal-to-metal bonding and bonding have become possible, and its reliability has also been improved. The combined concave depression can be omitted, which makes the assembly and construction of the horizontal spring device more efficient.

<Effect of Configuration 3>
The rubber block unit and the connecting plate can be integrated by screw joining by thickening the end steel plates attached to the upper and lower ends of the rubber block, cutting off the external thread on the side and cutting the internal thread on the connecting plate side. .

  The main points of assembly are that the male screws at both ends of the rubber block unit are rotated in the reverse direction at the upper and lower ends, and four or more rubber block units existing on the same level are screwed in while rotating simultaneously. By this joining method, it is possible to secure high strength of the joint itself, and at the same time, it is possible to incorporate the thickness portion of the steel plate of the rubber block necessary for threading into the plate thickness of the connecting plate, and the overall height of the device Can be stored more compactly.

<Effect of Configuration 4>
By making the planar dimensions of the end steel plates attached to the upper and lower ends of the rubber block larger than the planar dimension of the rubber block, the rubber block unit and the connecting plate can be bolted or welded.

In the case of performing bolt joining, it is possible to make a through hole in the connecting plate, penetrate two rubber block units that are located above and below the connecting plate with one bolt, and fix them with a nut.
Further, the fixing base plate at the upper and lower ends of the horizontal restoring spring device can be fixed with a nut by cutting a female screw or penetrating the base plate.

  When welding the end steel plate and connecting plate of the rubber block unit by welding, ensure the distance between the welded portion and the rubber block so that the rubber body of the rubber block unit does not exceed 150 ° C due to welding heat. It is necessary to perform work and heat / temperature management appropriately.

<Effect of Configuration 5>
By making the thickness of the peripheral portion of the end steel plate thinner than the thickness of the rubber contact portion, there is an effect of making it difficult for the rubber body to come into contact with the tip of the bolt or nut during horizontal deformation of the rubber body. This is an improvement measure when the rubber block unit and the connecting plate are integrated by bolt joining. That is, when bolted, the nuts on the head and back of the bolt will protrude from the connecting plate and the end steel plate, and if the horizontal deformation of the rubber block increases, the rubber body of the rubber block will protrude to the protruding portion of the bolt and nut. May come into contact, and in some cases, the rubber body may be cut or damaged. With configuration 5, this fear can be avoided.

<Effect of Configuration 6>
By using non-magnetic metals such as SUS304 and SUS305, such as austenitic stainless steel and aluminum alloy, generation of magnetic force and action on this device can be avoided even in a strong magnetic field, and normal restoring force characteristics are exhibited. be able to.

  This configuration has the following two effects. The first is to increase the corrosion resistance of the steel material constituting the apparatus and to increase the durability and the service life, and the second is to reduce the maintenance and maintenance during the service life of the apparatus.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the structure and shape of the rubber block unit which is a basic component of this invention, (1) Cross-sectional view of a cylindrical-shaped rubber block unit, (2) Vertical cross-sectional view of a cylindrical-shaped rubber block unit (3) A cross-sectional view of a rubber block unit having a prismatic shape, and (4) a vertical cross-sectional view of a rubber block unit having a prismatic shape. It is a figure which shows the joining method of the rubber block unit and connecting plate in Example 1, (1) The longitudinal cross-sectional view of the part of a rubber block unit and a connecting plate, (2) The cross section. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the whole structure of the horizontal restoring spring apparatus for seismic isolation structures by Example 1, (1) Longitudinal sectional view, (2) Transverse sectional view seen from the center part vicinity. It is a figure which shows the joining method by the screw system of the rubber block unit and connection board in Example 3 (configuration 3). (1) In the block diagram of the rubber block unit, the left side is a cross-sectional view, and the right side is a vertical cross-sectional view. 2) It is a longitudinal cross-sectional view which shows the joining procedure by screwing a rubber block unit and a connecting plate. It is a figure which shows the joining state by the volt | bolt of the rubber block unit and a connection board in Example 4 (1 of the structure 4), (1) It is a block diagram of a rubber block unit, a left side is a cross-sectional view, a right side is a longitudinal cross-sectional view, (2) It is a longitudinal cross-sectional view which shows the integration point by the bolt joint of a rubber block unit and a connection board. It is a figure which shows the joining state by welding of the rubber block unit and connecting plate in Example 5 (2 of the structure 4), (1) In the block diagram of a rubber block unit, the left side is a cross-sectional view, the right side is a longitudinal cross-sectional view, (2) It is a longitudinal cross-sectional view which shows the integration point by the welding joining of a rubber block unit and a connection plate. It is a figure which shows the joining state by the volt | bolt of the rubber block unit and a connection board in Example 6, (1) It is a block diagram of a rubber block unit, a left side is a cross-sectional view, a right side is a longitudinal cross-sectional view, (2) Rubber block unit It is a longitudinal cross-sectional view which shows the integration point by the bolt joining of a connection plate.

  Hereinafter, the present invention will be described with reference to the drawings illustrating embodiments. In addition, the same code | symbol is attached | subjected to the common part.

  1-3 is a figure which shows the construction method of the horizontal restoring spring apparatus for seismic isolation structures of Example 1, and is the method shown below. That is, first, a rubber-like elastic body block (hereinafter referred to as “rubber block 11”) having a height / width elevational shape (hereinafter referred to as “aspect ratio”) of 1 or more and 2 or less is created. The rubber block unit 1 is produced by integrating the end steel plates 12 having the same plane dimensions as the rubber block 11 on both the upper and lower end faces of the rubber block 11 by adhesive bonding or vulcanization bonding. At least four rubber block units 1 are arranged in a plane at a distance from each other, and a connecting plate 2 is arranged above and below the rubber block unit 1 to connect the separated rubber block units on the same plane (same height). To do. On both the upper and lower surfaces of the connecting plate 2, there are provided concave recesses 21 that fit with the end steel plates 12 of the rubber block unit, and the upper and lower ends of the rubber block unit 1 are inserted into the concave recesses 21 of the connecting plate 2, and both Glue and integrate the contact surfaces. A multi-layered rubber column framework 5 is constructed by stacking two or more rubber column layers 4 integrated with four or more rubber block units 1 and connecting plates 2 in the vertical direction. The base plate 3 for fixing which has the concave hollow 21 fitted to the uppermost and the lowermost rubber block unit 1 is arrange | positioned at the upper and lower ends of this multilayer rubber column frame 5, and it integrates by adhesion | attachment.

  FIG. 1 shows a shape and a configuration example of a rubber block unit 1 which is a basic element in configuring a horizontal restoring spring device for a seismic isolation structure according to the present invention. The rubber block unit 1 is composed of a rubber block 11 and an end steel plate 12 provided on the lower end surface thereof. The rubber block 11 is a lump of rubber material and is not a laminated rubber. The rubber block 11 and the end steel plate 12 are basically integrally formed by vulcanization adhesion, but both may be joined with an adhesive.

  FIGS. 1A and 1B show an example in which the rubber block 11 has a cylindrical shape. End steel plates 12 are arranged on the upper end and the lower end of the cylindrical rubber block 11, respectively. In this case, the end steel plate 12 has a circular plane in accordance with the rubber block 11.

  (3) and (4) of FIG. 1 show an example in which the rubber block 11 has a prismatic shape. The end steel plate 12 has a square shape in accordance with the rubber block 11.

  FIG. 2 shows a procedure for joining the rubber block unit 1 and the connecting plate 2 in the configuration 1 of the present invention. A concave recess 21 having a planar shape slightly larger than the planar shape of the end steel plate 12 of the rubber block unit 1 is provided at four planes of the connecting plate 2. The end steel plate 12 of the rubber block unit 1 is fitted into the concave depression 21, and the contact surface between the end steel plate 12 and the concave depression 21 of the connecting plate 2 is bonded with a metal adhesive. It is important that the metal surface to be the bonding surface is blasted in advance and the adhesive is applied after the surface is cleaned.

  FIG. 3 shows the overall shape of the horizontal restoring spring device for a seismic isolation structure according to Configuration 1. As shown in FIG. 3, fixing base plates 3 are arranged at the upper and lower ends of the apparatus. By inserting anchor bolts (not shown) into anchor bolt holes 31 provided in the vicinity of the four corners of the fixing base plate 3, the entire apparatus is attached to a predetermined foundation (lower side) and upper structure (upper side). Can be fixed. Reference numeral 4 denotes a rubber pillar hierarchy, and reference numeral 5 denotes a multi-layered rubber pillar framework.

As shown in FIGS. 2 and 3, in the first embodiment, the connecting plate 2 and the fixing base plate 3 are provided with a concave recess 21 for fitting with the end steel plate 12 of the rubber block unit 1. However, when the reliability of the metal adhesive is high, the concave depression 21 can be omitted. The other configuration is the same as that of the first embodiment.
That is, in the configuration 2, the upper and lower end portions of the rubber block unit 1 are omitted from the provision of the concave depression 21 and are directly arranged on the connecting plate 2 and the fixing base plate 3 which are made flat, The contact surfaces are bonded and integrated.

FIG. 4 shows Configuration 3 of the present invention.
The construction method of the horizontal restoring spring device for a seismic isolation structure according to the third embodiment is as follows. That is, first, a rubber block 11 having an elevational aspect ratio of 1 to 2 is created. A rubber block unit 1 in which a planar dimension is slightly larger than the rubber block on both upper and lower end surfaces of the rubber block 11 and a circular flat end steel plate 13 is integrated by adhesive bonding or vulcanization bonding is created. At least four rubber block units 1 are arranged in a plane with a distance from each other. On the upper and lower sides of the rubber block unit 1, there are arranged connecting plates 2 for connecting the separately arranged rubber block units on the same plane (same height). Male screws in the reverse rotation direction are cut on the side surfaces of the end steel plates 13 at the upper and lower ends of the rubber block, and female screws that match the male screws of the rubber block end steel plates 13 are cut on the connecting plate 2. The rubber block unit 1 is rotated around the vertical axis and integrated with the connecting plate 2 by screwing. A multi-layered rubber column framework 5 is constructed by stacking two or more rubber column layers 4 integrated with four or more rubber block units 1 and connecting plates 2 in the vertical direction. The base plate 3 for fixing which has a female screw is arrange | positioned at the upper and lower ends of the multilayered rubber pillar frame 5, and the whole horizontal restoration spring apparatus for seismic isolation structures is constructed by integrating with a rubber block unit by screw joining. The

  In the configuration 3, the rubber block unit 1, the connecting plate 2, and the fixing base plate 3 are joined by screwing. That is, as shown in FIG. 4, the end steel plates 13 attached to both ends of the rubber block 11 are made slightly thicker than the end steel plates 12 shown in FIGS. 2 and 3, and are threaded on the outer peripheral surfaces thereof. A male screw is provided. On the other hand, the connecting plate 2 and the fixing base plate 3 are provided with female screw holes 23 into which the end steel plates 13 are screwed. At this time, the direction of threading of the end steel plate 13 is set to be the reverse rotation direction on the upper end side and the lower end side of the rubber block 11, and the rubber block unit 1, the connecting plate 2, and the fixing base plate 3 are assembled. It is important in going.

  FIG. 4B shows a joining procedure by screwing the rubber block unit 1 and the connecting plate 2 in the configuration 3. All the rubber block units 1 in the same column layer 4 are rotated almost at the same time, and are screwed in at the same depth up to half of the thickness of the connecting plate 2, and the upper and lower rubber block units 1 of the connecting plate 2 are screwed in at almost the same depth. It is important to ensure that

  FIG. 5 shows a method of bolting the rubber block unit 1 and the connecting plate 2 in the configuration 4 of the present invention. FIG. 5 (1) shows a configuration method of the rubber block unit 1 according to configuration 4. In the configuration 4, the planar dimensions of the end steel plates 12 attached to both ends of the rubber block 11 are made larger than the plane of the rubber block 11, and holes 14 for bolt connection are provided in this.

  (2) of FIG. 5 is a partial cross-sectional view showing a procedure for joining the rubber block unit 1 and the connecting plate 2 in the configuration 4 with bolts. The connecting plate 2 is also drilled with bolt joint holes 22 having the same diameter and pitch, the bolts 15 are inserted, and the connecting plate 2 and the three members of the rubber block unit 1 disposed on both sides thereof are joined together. . It should be noted that the positional relationship between the bolt 15 and the nut to be screwed to it is basically that the bolt 15 is arranged on the upper side and the nut is arranged on the lower side so that the bolt 15 does not fall off even if the nut is loosened. The configuration.

  FIG. 6 shows a procedure for welding and joining the rubber block unit 1 and the connecting plate 2 in the configuration 4 of the present invention. FIG. 6 (1) shows a configuration method of the rubber block unit 1 according to configuration 4. In this case as well, the planar dimensions of the end steel plates 12 attached to both ends of the rubber block 11 are made larger than the plane of the rubber block 11, but the bolt joining holes 22 shown in FIG. 5 are not necessary.

  (2) of FIG. 6 has shown the longitudinal cross-sectional view in the case of carrying out the welding joining of the rubber block unit 1 and the connection board 2 in the structure 4. FIG. In the case of welding joining, it is desirable to avoid as much as possible that welding heat from the welded portion 16 is transmitted to the rubber block 11. For this reason, as a general rule, welding around the entire circumference is avoided and the weld length is kept to the minimum necessary. As shown in (1) of FIG. 6, the welding position is preferably near the corner of the end steel plate 12.

  FIG. 7 shows a method of bolting the rubber block unit 1 and the connecting plate 2 in the configuration 5 of the present invention, which is an improved type of the fourth embodiment. FIG. 7 (1) shows a configuration method of the rubber block unit 1 according to the configuration 5. In Configuration 5, the planar dimensions of the end steel plates 12 attached to both ends of the rubber block 11 are made larger than the planar dimensions of the rubber block 11, and the thickness of the rubber contact portion of the end steel plates 12 is made thicker than the thickness of the peripheral portion. ing.

  (2) of FIG. 7 is a partial cross-sectional view showing a procedure for joining the rubber block unit 1 and the connecting plate 2 in the configuration 5 with bolts. The end steel plate 12 is configured such that two plates having different thicknesses are overlapped and integrated. That is, the end steel plate 12 is configured such that the thickness of the portion in contact with the central rubber block 11 is thick and the thickness of the outer peripheral portion is thin. As shown in (2) of FIG. 7, when bolts and nuts are attached, the heads of the bolts and nuts do not protrude so much to the height of the rubber block 11. For this reason, even when the rubber block 11 is largely subjected to horizontal shear deformation, it is possible to prevent the rubber block 11 from coming into contact with and damage to the tip of the bolt or nut.

  In Example 7, all steel sheets and steel materials used in the flat restoring spring device for seismic isolation structures according to the present invention shown in FIGS. 1 to 7 are austenitic stainless steels such as SUS304 and SUS305, duplex stainless steels. Steel, other stainless steel, super stainless steel, aluminum alloy, and other non-magnetic metals are used.

DESCRIPTION OF SYMBOLS 1: Rubber block unit 11: Rubber block 12: End part steel plate 13: End part steel plate threaded on the side surface 14: Bolt joining hole 15: Joining bolt 16: Welding part 2: Connecting plate
21: Recessed recessed portion for fitting the connecting plate 22: Hole for connecting the bolt of the connecting plate 23: Screw hole for connecting the screw provided in the connecting plate 3: Fixing base plate 31: Hole for anchor bolt 4: Rubber column hierarchy
5: Multi-story rubber pillar framework

Claims (1)

Create a rubber block that has an aspect ratio of 1 to 2
Create a rubber block unit in which the planar dimensions are slightly larger than the rubber block on the upper and lower end faces of the rubber block, and the circular flat end steel plates are integrated by adhesive bonding or vulcanization bonding,
At least four rubber block units are arranged in a plane with a distance from each other,
On the upper and lower sides of the rubber block unit, a connecting plate for connecting the separated rubber block units on the same plane (same height) is arranged,
Cut the male thread in the reverse rotation direction on the side of the end steel plate at the upper and lower ends of the rubber block,
The connecting plate is cut with a female screw that matches the male screw of the rubber block,
Rotate the rubber block around a vertical axis and integrate by screwing to the connecting plate,
Constructing a multi-layered rubber pillar framework in which two or more rubber pillar layers integrated with four or more rubber block units and connecting plates are stacked in the vertical direction,
A method for constructing a horizontal restoring spring device for a seismic isolation structure, characterized in that a fixing base plate having a female screw is arranged at both upper and lower ends of the multi-layered rubber pillar frame and integrated with the rubber block unit by screw joining. .