JP2006241729A - Base isolating foundation structure of structure, and construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base isolating foundation structure simple and equipped with versatility and economical efficiency while absorbing vibrational energy caused by an earthquake, as a base isolating foundation structure of a structure, and to provide a construction method. <P>SOLUTION: A rigid fitting 4 protuberant in channel shape at the center part 4c is fixed to the foundation 1, and a beam 2 is fixed by an elastic fitting 3 of recessed cross section. The elastic fitting 3 is disposed so that a bottom plate 3c of the elastic fitting 3 enters the center part 4c of the rigid fitting 4, and flat base isolating devices 5 are interposed between the beam 2 and the rigid fitting 4 and between the elastic fitting 3 and the foundation 1 to carry out sliding bearing of the foundation 1 and the beam 2 used as a sill of the structure. The base isolating device 5 has a laminated body 51 with a plurality of steel plates 53 laminated, and an elastic body 52 for regulating and connecting the steel plates 51 to apply restoring force to stress from an orthogonal direction to the steel plate laminating direction of the laminated body 51. A smooth surface layer 53a is provided between the plurality of steel plates 53. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a base isolation structure and a construction method for a structure. Examples of the structure include a wooden building constructed on a concrete cloth foundation or boulder, or a display shelf and machinery having a mount.

  As a general construction method for wooden buildings, a construction method is known in which a foundation and a roof are fixed by fixing wooden foundation materials and columns with anchor bolts on a concrete cloth foundation or boulders. ing. However, if the wooden base material or pillar is fixed directly to the concrete, there will be a problem that the contact area will be corroded by the moisture of the concrete, and it will be difficult to ventilate the floor under the building. A plastic backing was installed between the concrete foundation. However, when the building is vibrated by an earthquake, the plastic backing material is difficult to absorb the vibration energy, causing damage to the foundation and distortion of the roof.

  As a measure against the above, instead of plastic receiving material, a rubber base as a seismic isolation device that lays a laminated material composed of rubber and synthetic resin material between the foundation and the foundation and absorbs vibration energy due to earthquakes and its laying A method has been invented (see, for example, Patent Document 1).

  On the other hand, in order to prevent the display shelf and machinery structures from collapsing due to an earthquake, conventionally, the cross-sectional area of the structural frame of these structures or the structural members of the structure itself has been increased to increase the rigidity of the structural frames and the structure. It was. However, when the cross-sectional area of the structural member is increased, the volume and weight of the gantry and the structure increase, which increases the manufacturing cost of the gantry and the structure.

  Attempts have been made to absorb and attenuate vibration energy by interposing an elastic body such as rubber between the gantry and the structure without changing the structure of the gantry or the structure. However, when vibration energy is absorbed only by rubber, the amount of vibration energy that can be absorbed by rubber depends on the volume of rubber, and it is necessary to increase the volume of rubber when a large earthquake is assumed.

  In place of measures to support the gantry and structure with an elastic body such as rubber, an article-isolating quake-free base was invented that constituted the mechanical elements such as rollers, bearings, and rails and slidably supported the gantry and structure. (For example, refer to Patent Document 2).

The seismic isolation table according to Patent Document 2 reliably attenuates large horizontal vibrations even in the event of a large earthquake, and exhibits such as exhibits on the seismic isolation table, or items such as display cases and exhibits stored in the interior collapse. It is said that the restoration to the original position after the earthquake has stopped is good.
JP-A-8-232500 JP-A-10-281217

  However, as a seismic isolation device for a wooden building, when vibration energy is absorbed only by the elastic force of rubber, the absorption rate of vibration energy depends on the elasticity of rubber. However, when rubber is laid under a heavy object such as a building, it is compressed and its elasticity becomes weak. Therefore, in order to absorb vibration energy due to an earthquake, the rubber must be thickened. However, when the rubber is thickened, there is a problem that the base becomes unstable if it is installed between a wooden base or the like and a concrete foundation.

  On the other hand, when the display shelf and machinery structure and frame are slid and supported by machine elements, the mechanism consisting of elements such as rollers, rails, and bearings is stored between the structure and the frame. The mount volume is increased. In addition, this base isolation structure has a complicated structure. There is a need for a seismic isolation basic structure and construction method that is simple in construction, versatile, and inexpensive. That is, these may be the subject of the present invention.

  In order to solve such conventional problems, the present invention is a simple, versatile and economical base-isolated base structure and construction method that absorbs vibration energy due to an earthquake as a base-isolated base structure of a structure. The purpose is to provide.

  In order to achieve the above object, the inventor fixes a rigid metal fitting whose center portion is raised in a groove shape to a base, fixes the beam with an elastic fitting having a concave cross section, and the bottom plate of the elastic fitting is a rigid body. A structure and method in which a flat seismic isolation device is interposed between a beam and a rigid metal fitting, and between an elastic metal fitting and a foundation, and the beam serving as the foundation of the structure. We have invented the seismic isolation basic structure and construction method for the following new structures that support sliding.

  (1) A base isolation structure for a structure that slides and supports a foundation and a beam serving as a foundation of the structure, and has a pair of opposed refraction pieces fixed to both side surfaces of the beam. An elastic metal fitting with a concave cross section for providing a bottom plate to which a refractive piece is coupled, a pair of attachment pieces fixed to the foundation on both wings, a rigid metal fitting with a central portion raised in a groove shape, and a plurality of The elastic metal fitting is fixed to the beam with a predetermined interval between the bottom surface of the beam and the bottom plate, and the bottom surface of the beam and the raised surface of the rigid metal fitting are opposed to each other. The bottom plate is disposed in the central portion, the seismic isolation device is interposed between the bottom surface of the beam and the raised surface of the rigid metal fitting, and the bottom plate and the base surface are interposed between the base plate and the base surface. A seismic isolation device is interposed, and the seismic isolation device is configured by laminating a plurality of steel plates. A laminated body, and an elastic body that regulates and connects the steel sheets so as to give a restoring force to a stress from a direction orthogonal to the steel sheet laminating direction of the laminated body. Is a base-isolated base structure with at least one smooth surface layer.

  The invention of (1) is a base-isolated base structure for a structure that slides and supports a foundation and a beam serving as a foundation of the structure, and includes an elastic metal fitting having a concave cross section, a rigid metal fitting, and a plurality of flat shapes. And a seismic isolation device. The elastic metal fitting has a pair of opposed refraction pieces fixed to both side surfaces of the beam, and is provided with a bottom plate that couples the pair of refraction pieces. The rigid metal fitting has a pair of attachment pieces fixed to the foundation on both wings, and the central portion is raised in a groove shape.

  For example, the foundation may be a fabric foundation made of concrete for construction. In the present invention, a foundation for supporting a display shelf and a structure of machinery is also included in the concept of the foundation. For example, the base beam may be a building square or a steel beam made of channel steel or a square pipe. A sliding bearing is a base-isolated base structure of a structure subject to vibration disturbance, and is to support the base of the structure with an insulating device (base-isolated bearing) having low horizontal rigidity. And this invention slide-supports the beam used as the foundation of a foundation and a structure by the mechanical insulation method.

  For example, the elastic metal fitting can be obtained by bending a steel plate to obtain a concave cross-sectional shape. The facing distance between the inner walls of the pair of refracting pieces is slightly larger than the distance between both side surfaces of the beam, and the pair of refracting pieces preferably sandwich the both side surfaces of the beam. Fastened to both sides of the beam with fasteners.

  For example, a rigid metal fitting can obtain a desired shape by cutting a grooved steel into a central portion and welding a pair of attachment pieces to be thick steel plates on both sides of the grooved steel. The rigid metal fitting can also be obtained by cutting a ferrous cast material to obtain a desired shape. For example, the pair of attachment pieces are fixed to a pair of anchor bolts provided on the foundation with nuts.

  In the invention of (1), the elastic metal fitting is fixed to the beam with a predetermined distance between the bottom surface and the bottom plate of the beam. A bottom plate is disposed in the central portion of the rigid metal fitting so that the bottom surface of the beam and the raised surface of the rigid metal fitting face each other. A seismic isolation device is interposed between the bottom surface of the beam and the raised surface of the rigid metal fitting, and a seismic isolation device is interposed between the bottom surface and the base surface of the bottom plate.

  Here, since at least one seismic isolation device and the central part of the rigid metal fitting are interposed between the bottom surface and the bottom plate of the beam, the predetermined interval provided on the bottom surface and the bottom plate of the beam is (one seismic isolation device). Or more (thickness of two seismic isolation devices + thickness of the central portion) or less. In addition, since at least one seismic isolation device and a bottom plate are interposed in the central portion of the rigid metal fitting, the depth of the groove in the central portion is (thickness of one seismic isolation device + thickness of the bottom plate). The above may be sufficient, and (the thickness of the two seismic isolation devices + the thickness of the bottom plate) or less is preferable.

  The first seismic isolation device disposed on the upper surface of the foundation and the second seismic isolation device disposed on the upper surface of the central part are preferably coaxial, and the first seismic isolation device and the second seismic isolation device. May be arranged in pairs. A vertical load acts on the first seismic isolation device from the elastic metal fitting, and a vertical load acts on the second seismic isolation device from the beam.

  In the invention of (1), the seismic isolation device includes a laminated body and an elastic body. The laminate is configured by laminating a plurality of steel plates. The elastic body regulates and connects the steel plates so as to give a restoring force to the stress from the direction orthogonal to the steel plate lamination direction of the laminate. And at least one smooth surface layer is provided between the plurality of steel plates.

  In this seismic isolation device, the elastic body may cover the circumference of the laminated body to integrate a plurality of steel plates, and the elastic body may be a foreskin-like elastic body that wraps the entire laminated body. Further, the smooth surface layer may be composed of an opposing surface of a pair of steel plates and an intervening body sandwiched between the opposing surfaces, and the smooth surface layer may be composed of an opposing surface that has been lubricated.

  The plurality of steel plates may be disk-shaped steel plates, and the elastic body may be a cylindrical shape made of rubber. The elastic body may be a chemically synthesized elastomer that is a soft elastic body, and a plurality of disk-shaped steel plates are placed in holes formed in the elastomer, and the periphery of the plurality of steel plates is surrounded by an elastomer. It may be surrounded by. The side edges of the plurality of steel plates are preferably chamfered.

  Since this seismic isolation device has a smooth surface layer between a plurality of steel plates, the plurality of steel plates move laterally to absorb vibration energy. And the horizontal movement of a some steel plate can be converged by the restoring force of the elastic body which comprises the said laminated body by connecting and integrating these some steel plates. In addition, since most of the seismic isolation devices are made of steel plates, they are stronger against compressive force than most of the seismic isolation devices made of rubber, and heavy objects such as buildings and their Even when installed between the foundation and the base, it is possible to absorb vibration energy and attenuate vibration without increasing the thickness of the seismic isolation device.

  Therefore, in place of the plastic receiving material sandwiched between the concrete foundation of the wooden building and the wooden base, even when the seismic isolation device is installed, the thickness is high enough to ensure the stability of the base. Seismic isolation performance can be demonstrated.

  In this seismic isolation device, the elastic body covers the circumference of the laminate and integrates the plurality of steel plates, thereby providing a restoring force to the plurality of steel plates that are laterally moved by vibration energy with the minimum elastic body. be able to. This seismic isolation device can be a compact and inexpensive seismic isolation device.

  Further, in this seismic isolation device, the elastic body does not easily separate from the laminated body by forming the elastic body into a foreskin shape that wraps the entire laminated body. By sealing the laminated body, moisture, dust, etc. enter between the steel plates constituting the laminated body, and the friction coefficient does not increase. Therefore, seismic isolation performance can be stabilized.

  In this seismic isolation device, the friction coefficient of the smooth surface layer can be further reduced by sandwiching the smooth surface layer between the opposing surfaces of the pair of steel plates and the interposed body between the opposing surfaces. The steel plate itself can exhibit high seismic isolation performance even if a commonly used steel plate is used as it is. In addition, the lateral movement of the steel plate becomes smoother by making the smooth surface layer a facing surface that has been subjected to a lubrication treatment.

  And this seismic isolation apparatus makes it difficult for the predetermined structure mounted in the seismic isolation apparatus to slip sideways by an earthquake by using rubber as an elastic body. By making the plurality of steel plates into a disc shape and the elastic body into a cylindrical shape, the same seismic isolation performance can be exhibited even with respect to vibrations from all directions in the horizontal direction.

  In the invention of (1), the seismic isolation device having the seismic isolation characteristics as described above is interposed between the bottom surface of the beam and the raised surface of the rigid bracket, and between the bottom surface and the base surface of the bottom plate. And the 1st seismic isolation apparatus arrange | positioned on the upper surface of a foundation slide-supports a foundation and an elastic metal fitting. Moreover, the 2nd seismic isolation apparatus arrange | positioned on the upper surface of the center part of a rigid metal fitting supports a rigid metal fitting and a beam.

  Thus, in the invention of (1), the vibration energy in the horizontal direction due to the earthquake acting on the foundation is absorbed by the seismic isolation device, and the vibration is absorbed without transmitting much of the vibration energy to the structure. And the beam which becomes the foundation of the foundation and the structure is slidingly supported by the seismic isolation device. Compared to the case where the foundation and the foundation beam are simply supported by the seismic isolation device, a combined effect can be expected. In addition, it is thought that it can contribute to absorption of the vibration energy of the horizontal direction by an earthquake by supporting a beam with an elastic metal fitting.

  In the invention of (1), the vibration energy is absorbed by using the slip coupling between the rigid plates and the restoring force of the elastic body without absorbing the vibration energy only by the elastic force of the rubber as in the prior art. According to the invention of (1), the distance between the foundation and the foundation can be made thinner than the conventional one, and the foundation can be stabilized.

  The invention (1) realizes a seismic isolation foundation structure with one set of an elastic metal fitting, a rigid metal fitting and two seismic isolation devices. These elastic metal fittings, rigid metal fittings, and seismic isolation devices are easy to manufacture, and can be said to have a simple configuration as compared with conventional seismic isolation basic structures composed of rollers, rails, and bearings. And it can be said that it is excellent in versatility and economy.

  (2) The base isolation structure for a structure according to (1), wherein the base isolation device is further interposed between an opposing surface of the raised surface of the central portion and an upper surface of the bottom plate.

  A rigid body is defined as, for example, an object whose deformation is considered negligible when an external force is applied. According to the present invention, it is preferable that the rigid metal fitting is designed so that the deflection of the central portion can be ignored with respect to the vertical load acting on the central portion of the rigid metal fitting. However, depending on the combination of the elastic metal fitting and the rigid metal fitting, it is not always possible to design the rigid metal fitting to such an extent that the bending of the central portion can be ignored.In this case, between the opposed surface of the raised surface and the upper surface of the bottom plate, A seismic isolation device may be further interposed to reinforce the deflection at the center.

  (3) A building construction method for slidingly supporting a foundation on which anchor bolts are embedded and a beam serving as a foundation of the building, the first step of forming the foundation, and the seismic isolation device according to (1) A second step of installing a pair of the anchor bolts, a third step of installing the elastic fitting according to (1) on the seismic isolation device, and a rigid fitting according to (1) as a bottom plate according to (1) A method for constructing a building, comprising: a fourth step to be installed on top, and a fifth step to install the seismic isolation device according to (1) on the central portion according to (1).

  (4) A sixth step in which the seismic isolation device according to (1) is further interposed between the opposing surface of the raised surface of the central portion according to (1) and the upper surface of the bottom plate according to (1). The building construction method described in (3).

  The seismic isolation base structure of the present invention includes an elastic metal fitting fixed to a beam, a rigid metal fitting fixed to the foundation, and a plurality of seismic isolation devices. And the 1st seismic isolation apparatus arrange | positioned on the upper surface of a foundation slide-supports a foundation and an elastic metal fitting. Moreover, the 2nd seismic isolation apparatus arrange | positioned on the upper surface of the center part of a rigid metal fitting supports a rigid metal fitting and a beam. According to the seismic isolation foundation structure of the present invention, the distance between the foundation and the base can be reduced as compared with the conventional one while maintaining a high absorption rate of vibration energy due to the earthquake. And it is possible to provide a seismically isolated foundation that is compact, highly versatile, and inexpensive.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is an exploded perspective view showing a first embodiment of a base isolation structure for a structure according to the present invention. FIG. 2 is a front view of the base isolation structure of the structure according to the first embodiment. FIG. 2 has a cross section of an elastic metal fitting and a rigid metal fitting. FIG. 3 is a longitudinal sectional view of the base isolation structure for a structure according to the first embodiment.

  FIG. 4 is a cross-sectional view of the seismic isolation device according to the first embodiment. FIG. 5 is a perspective external view of the seismic isolation device according to the first embodiment. In the seismic isolation device shown in FIG. 5, only the side periphery of the two plates is covered with a rubber cover. FIG. 6 is a perspective external view of the seismic isolation device according to the first embodiment. The seismic isolation device shown in FIG. 6 has a rubber cover covering the entire two plates in a foreskin shape. FIG. 7 is a perspective external view of the seismic isolation device according to the first embodiment. The seismic isolation device shown in FIG. 7 has two plates formed in a rectangular shape.

  FIG. 8 is a diagram illustrating a method of measuring the relationship between the horizontal load and displacement when a vertical load is applied to the seismic isolation device according to the first embodiment. FIG. 9 is a load displacement curve diagram of the seismic isolation device by the measurement method of FIG. FIG. 10 is a load displacement curve diagram of the seismic isolation device by the measurement method of FIG.

  FIG. 11: is a front view which shows 2nd Embodiment of the base isolation structure of the structure by this invention. 12 is a cross-sectional view taken along arrow AA in FIG.

  Initially, the structure of the base isolation structure of the structure by 1st Embodiment of this invention is demonstrated. 1 to 3, the base isolation structure according to the present invention includes a foundation 1 and a beam 2 that serves as a foundation of the structure. This base isolation structure includes an elastic metal fitting 3 having a concave cross section, a rigid metal fitting 4, and a plurality of flat base isolation devices 5. The elastic metal fitting 3 has a pair of opposing refraction pieces 3a and 3b fixed to both side surfaces of the beam 2, and a bottom plate 3c that couples the pair of refraction pieces 3a and 3b. The rigid metal fitting 4 has a pair of attachment pieces 4a and 4b fixed to the foundation 1 on both wings, and a central portion 4c is raised in a groove shape.

  1 to 3, the structure is, for example, a wooden building, and the foundation 1 is a concrete cloth foundation for construction. In the present invention, as will be described later, a platform for supporting a display shelf and a mechanical structure is also included in the concept of the foundation 1. In FIG. 1 to FIG. 3, the beam 2 serving as a base is a square member for wooden construction, but the beam 2 may be a steel beam made of channel steel or a square pipe.

  For example, the elastic metal fitting 3 can be obtained by bending a steel plate to obtain a concave cross-sectional shape. In FIG. 3, the facing distance between the inner walls of the pair of refracting pieces 3 a and 3 b is slightly larger than the distance between both side surfaces of the beam 2, and the pair of refracting pieces 3 a and 3 b sandwich both side surfaces of the beam 2. . The pair of refracting pieces 3 a and 3 b are fixed to both side surfaces of the beam 2 with fasteners such as bolts 31 and screws 32.

  For example, the rigid metal fitting 4 is obtained by cutting a grooved steel into a central portion 4c, and welding a pair of attachment pieces 4a and 4b, which are thick steel plates, on both sides of the grooved steel to obtain a desired shape. Obtainable. Moreover, the rigid metal fitting 4 can also obtain a desired shape by cutting an iron-based cast material. The pair of attachment pieces 4a and 4b are fixed to a pair of anchor bolts 1a and 1b provided on the foundation 1 with nuts 11 (see FIG. 2).

  As shown in FIGS. 1 to 3, the elastic metal fitting 3 is fixed to the beam 2 with a predetermined distance between the bottom surface of the beam 2 and the bottom plate 3 c. In addition, a bottom plate 3 c is disposed in the central portion 4 c of the rigid metal member 4 so that the bottom surface of the beam 2 and the raised surface of the rigid metal member 4 face each other. The seismic isolation device 5 is interposed between the bottom surface of the beam 2 and the raised surface of the rigid metal fitting 4, and the seismic isolation device 5 is interposed between the bottom surface of the bottom plate 3 c and the base 1 surface. In FIG. 1 to FIG. 3, a seismic isolation device 5 may be further interposed between the opposed surface of the raised surface of the central portion 4 c and the upper surface of the bottom plate 3 c.

  1 to 3, since at least one seismic isolation device 5 and the central portion 4c of the rigid metal fitting 4 are interposed between the bottom surface of the beam 2 and the bottom plate 3c, they are provided on the bottom surface and the bottom plate 3c of the beam 2. The predetermined interval may be equal to or greater than (the thickness of one seismic isolation device 5 + the thickness of the central portion 4c), and is preferably equal to or less than (the thickness of two seismic isolation devices 5 + the thickness of the central portion 4c). . Further, since at least one seismic isolation device 5 and the bottom plate 3c are interposed in the central portion 4c of the rigid metal fitting 4, the depth of the groove of the central portion 4c is determined by (the thickness of one seismic isolation device 5). + Thickness of bottom plate 3c) or more, preferably (thickness of two seismic isolation devices 5 + thickness of bottom plate 3c) or less.

  1 to 3, the first seismic isolation device 5 disposed on the upper surface of the foundation 1 and the second seismic isolation device 5 disposed on the upper surface of the central portion 4c are preferably coaxial, The seismic isolation device 5 and the second seismic isolation device 5 may be arranged in pairs. In FIG. 1 to FIG. 3, a vertical load acts on the first seismic isolation device 5 from the elastic metal fitting 3, and a vertical load acts on the second seismic isolation device 5 from the beam 2.

  4 or 5, the seismic isolation device 5 includes a laminated body 51 and an elastic body 52. The laminated body 51 is configured by laminating a plurality of steel plates 53. The elastic body 52 regulates and connects the steel plates 53 so as to give a restoring force to the stress from the direction orthogonal to the steel plate lamination direction of the laminated body 51. Between the two steel plates 53, at least one smooth surface layer 53a is provided.

  As shown in FIG. 4 or 5, in the seismic isolation device 5, the elastic body 52 covers the circumference of the laminated body 51 and integrates the two steel plates 53. In FIG. 6, the elastic body 52 is a foreskin-like elastic body that wraps the entire laminate 51. Further, the smooth surface layer 53a may be composed of an opposing surface of a pair of steel plates 53 and an intervening body sandwiched between the opposing surfaces, and the smooth surface layer 53a is composed of an opposing surface that is lubricated. Also good.

  As shown in FIGS. 4 to 6, the steel plate 53 may be a disk-shaped steel plate, and as shown in FIG. 7, the steel plate 53 may be a rectangular steel plate. The elastic body 52 may have a cylindrical shape made of rubber. Further, the elastic body 52 may be a chemically synthesized elastomer that is a soft elastic body, and a plurality of disk-shaped steel plates 53 are placed in holes formed in the elastomer, and the plurality of steel plates 53 are placed. You may make it surround the circumference | surroundings of the side with an elastomer. The side edges of the plurality of steel plates 53 are preferably chamfered.

  In the embodiment shown in FIGS. 4 to 7, the material of the steel plate 53 is carbon steel (SS-400). The material of the steel plate 53 is not limited to SS-400, and other carbon steel, stainless steel, or the like can be used. 4 to 6, the steel plate 53 has a disk shape with a thickness of 6 mm and a diameter of 103 mm, and the side edge is chamfered with R0.5. On the surfaces of the two steel plates 53 facing each other, a smooth surface layer 53a is formed by PTFE (Polytetrafluorethylene) coating. The smooth surface layer 53a by PTFE coating has a sliding friction coefficient of 0.1 to 0.015.

  In the embodiment shown in FIGS. 4 to 7, the elastic body 52 is made of natural rubber and has a thickness of 2 mm. And the elastic body 52 has coat | covered the circumference | surroundings of the laminated body 51 as FIG. 5 shows. Further, as shown in FIG. 6, the entire laminated body 51 as an aggregate of a plurality of steel plates 53 may be wrapped with a cylindrical elastic body 52. Further, as shown in FIG. 7, when the outer shape of the steel plate 53 is rectangular, the elastic body 52 is a belt-like ring, and the elastic body is a belt-like ring at two locations on each side of the laminated body 51 of the steel plate 53. 52 can also be multiplied.

  In the present invention, the number of the steel plates 53 is not limited to two, and can be increased to two or more according to the space of the installation place and the weight of the structure to be protected from the earthquake. Moreover, the shape and thickness of the steel plate 53 are not limited to the above numerical values, and can be matched to the shape of the structure to be protected from the earthquake. For example, when used as a seismic isolation device for a wooden building, as shown in FIG. 7, it can be formed into a square shape in accordance with the shape of the foundation of the wooden building.

  In the smooth surface layer 53a, a fluororesin sheet can be inserted as an intervening body between the two steel plates 53 instead of PTFE coating on the surfaces where the plurality of steel plates 53 face each other. Moreover, you may use together PTFE coating and the insertion of a fluororesin sheet | seat.

  The material of the elastic body 52 is not limited to natural rubber, and can be deformed such as expansion and contraction, chloroprene rubber having characteristics such as high internal viscosity, wear resistance, crack resistance, and weather resistance. The synthetic rubber can also be used. The thickness of the elastic body 52 is not limited to 2 mm, and the thickness can be changed according to the weight of the structure to be protected from the earthquake and the application.

  Next, the structure of the base isolation structure of the structure by 2nd Embodiment of this invention is demonstrated. 11 or 12, the structure is, for example, a display shelf 62, and the foundation 1 is a beam provided on a gantry 61 that supports the display shelf 62. As described above, the present invention also includes the platform for supporting the display shelf and the structure of the machinery in the concept of the foundation 1. In the description of the second embodiment, the components having the same reference numerals used in the description of the first embodiment have the same operation, and therefore the description thereof may be omitted.

  11 or 12, a pair of mounting pieces 4a and 4b (see FIG. 1) of the rigid metal fitting 4 are fixed to the foundation 1 with bolts 12. And 4 sets of seismic isolation base structures which made the elastic metal fitting 3, the rigid metal fitting 4, and the two seismic isolation devices 5 into one set are arrange | positioned at the substantially four corners of the mount frame 61. FIG. The gantry 61 has a plurality of level feet 61 a and is installed on the floor G.

  Next, the operation of the present invention will be described.

  Since the seismic isolation device 5 has the smooth surface layer 53a between the plurality of steel plates 53 (see FIG. 4), the plurality of steel plates 53 move laterally to absorb vibration energy. Then, by connecting and integrating the plurality of steel plates 53, the lateral movement of the plurality of steel plates 53 can be converged by the restoring force of the elastic body 52 constituting the laminated body 51. In addition, since most of the seismic isolation device 5 of the present invention is composed of the steel plate 53, compared to the case where the majority of the seismic isolation device is composed of rubber, it is strong against compressive force and is like a building. Even if it is installed between a heavy object and its foundation, it can absorb vibration energy and damp vibration without increasing the thickness of the seismic isolation device.

  Therefore, in place of the plastic receiving material sandwiched between the concrete foundation of the wooden building and the wooden base, even when the seismic isolation device is installed, the thickness is high enough to ensure the stability of the base. Seismic isolation performance can be demonstrated.

  In the seismic isolation device 5, the elastic body 52 covers the circumference of the laminated body 51 and integrates the plurality of steel plates 53, so that the plurality of steel plates 53 moved laterally by vibration energy with a minimum elastic body. Can give resilience. The seismic isolation device 5 can be a compact and inexpensive seismic isolation device.

  Further, the seismic isolation device 5 does not easily separate the elastic body 52 from the laminated body 51 by making the elastic body 52 into a foreskin shape that wraps the entire laminated body 51. When the laminated body 51 is sealed, moisture, dust, or the like enters between the steel sheets constituting the laminated body, and the friction coefficient does not increase. Therefore, seismic isolation performance can be stabilized.

  The seismic isolation device 5 can further reduce the friction coefficient of the smooth surface layer 53a by sandwiching the smooth surface layer 53a between the opposing surfaces of the pair of steel plates 53 and an interposed body between the opposing surfaces. The steel plate 53 itself can exhibit high seismic isolation performance even if a commonly used steel plate is used as it is. In addition, the smooth movement of the steel plate 53 becomes smoother by making the smooth surface layer 53a a facing surface that has been subjected to a lubrication treatment.

  And this seismic isolation apparatus makes it difficult for the predetermined structure mounted in the seismic isolation apparatus to slip sideways by an earthquake by using rubber as an elastic body. By making the plurality of steel plates into a disc shape and the elastic body into a cylindrical shape, the same seismic isolation performance can be exhibited even with respect to vibrations from all directions in the horizontal direction.

  As shown in FIG. 1 to FIG. 3, the base isolation structure of the structure according to the present invention has the base isolation device 5 having the base isolation characteristics as described above, the bottom surface of the beam 2 and the raised surface of the rigid bracket 4. And between the bottom surface of the bottom plate 3c and one surface of the foundation. And the 1st seismic isolation apparatus 5 arrange | positioned on the upper surface of the foundation 1 slide-supports the foundation 1 and the elastic metal fitting 3. As shown in FIG. Further, the second seismic isolation device 5 disposed on the upper surface of the central portion 4 c of the rigid bracket 4 slides and supports the rigid bracket 4 and the beam 2.

  Thus, the base isolation structure of the structure according to the present invention absorbs the vibration energy in the horizontal direction due to the earthquake acting on the foundation 1 with the base isolation device 5 and transmits most of the vibration energy to the structure. Absorbs vibration. And the foundation 1 and the beam 2 which becomes the foundation of the structure are slidingly supported by the seismic isolation device 5 in a double manner. Compared to the case where the foundation 1 and the beam 2 as the foundation of the structure are simply supported by the seismic isolation device, a combined effect can be expected. In addition, it is thought that supporting the beam 2 with the elastic metal fitting 3 can contribute to absorption of vibration energy in the horizontal direction due to the earthquake.

  The base isolation structure of the structure according to the present invention does not absorb vibration energy only by the elastic force of rubber as in the prior art, but uses the slip coupling between the rigid plates 53 and the restoring force of the elastic body to generate vibration energy. Absorbs. According to the present invention, the distance between the foundation and the foundation can be reduced as compared with the prior art, and the foundation can be stabilized.

  Further, the present invention realizes a seismic isolation base structure with the elastic metal fitting 3, the rigid metal fitting 4, and the two seismic isolation devices 5 as one set. These elastic metal fittings 3, rigid metal fittings 4 and seismic isolation devices 5 are easy to manufacture, and can be said to have a simple structure as compared with conventional seismic isolation basic structures composed of rollers, rails and bearings. And it can be said that it is excellent in versatility and economy.

  In the base isolation structure for a structure according to the present invention, a base isolation device 5 may be further interposed between the opposed surface of the raised surface of the central portion 4c and the upper surface of the bottom plate 3c (see FIG. 1). .

  A rigid body is defined as, for example, an object whose deformation is considered negligible when an external force is applied. According to the present invention, it is preferable that the rigid metal fitting 4 is designed to such an extent that the deflection of the central portion 4c can be ignored with respect to the vertical load acting on the central portion 4c of the rigid metal fitting 4. However, depending on the combination of the elastic metal fitting 3 and the rigid metal fitting 4, it is not always possible to design the rigid metal fitting 4 to such an extent that the deflection of the central portion 4c can be ignored. In this case, the opposing surface of the raised surface and the upper surface of the bottom plate 3c Between them, the seismic isolation device 5 may be further interposed to reinforce the deflection of the central portion 4c.

  The base isolation structure of a structure according to the present invention is constructed by the following construction method in a building that slides and supports a foundation on which anchor bolts are embedded and a beam that is a foundation of the building.

  In Fig. 1, the foundation 1 of the wooden building is cut by rooting, crushed stones, and cast-in concrete, and then the ink is formed to form the foundation, the reinforcing bars are assembled, After the frame is assembled and the anchor bolts 1a and 1b are installed, the concrete of the foundation is placed, the top edge of the foundation 1 is leveled to a predetermined height from the ground surface, and the concrete is solidified. By dismantling, the foundation 1 of the wooden building is formed (first step).

  Next, the seismic isolation device 5 is installed between the pair of anchor bolts 1a and 1b (see FIG. 1) (second step). Next, the elastic metal fitting 3 is installed on the seismic isolation device 5 (third step). Next, the rigid metal fitting 4 is installed on the bottom plate 3c (see FIG. 2) (fourth step). In the fourth step, the rigid bracket 4 may be fixed to the pair of anchor bolts 1a and 1b. Next, the seismic isolation device 5 is installed on the central part 4c of the rigid metal fitting 4 (fifth step). Then, the beam 2 is installed on the seismic isolation device 5, and the pair of refracting pieces 3 a and 3 b are fixed to both side surfaces of the beam 2 with fasteners such as bolts 31 and screws 32, so that the seismic isolation foundation structure is constructed. finish.

  The construction method of the present invention may include a sixth step in which the seismic isolation device 5 is further interposed between the opposed surface of the raised surface of the central portion 4c and the upper surface of the bottom plate 3c after the fifth step. .

[Example of verification experiment]
Next, a verification experiment example in which the relationship between the horizontal load and the displacement is measured when a vertical load is applied to the seismic isolation device according to the present invention will be described. FIG. 9 and FIG. 10 are load displacement curve measurement diagrams of the seismic isolation device 5. FIG. 9 is a load displacement curve when the vertical load is 1000 kgf, and FIG. 10 is a load displacement curve when the vertical load is 2000 kgf.

  As shown in FIG. 8, the method of measuring the load displacement curve of the seismic isolation device 5 is as follows. Two seismic isolation devices 5 are stacked in the vertical direction, and an intermediate plate 5p is sandwiched between surfaces facing each other. A vertical load is applied from the upper surface of the seismic isolation device 5 and the lower surface of the lower seismic isolation device 5. The upper and lower seismic isolation devices 5 were fixed, a horizontal load was applied to the intermediate plate 5p, and the amount of horizontal displacement of the intermediate plate 5p was measured.

  As shown in FIG. 9, when the vertical load is 1000 kgf, the horizontal load is approximately 50 kgf and the horizontal displacement is 5 mm, the horizontal load is approximately 70 kgf and the horizontal load is 10 mm, the horizontal load is approximately 75 kgf and the horizontal load is 15 mm and the horizontal load is horizontal. The load was horizontally displaced by 20 mm at a load of approximately 80 kgf.

  As shown in FIG. 10, when the vertical load was 2000 kgf, the horizontal load was approximately 120 mm, and the horizontal displacement was approximately 3 mm. Thereafter, the horizontal load was approximately 90 mm to approximately 120 kgf, and the horizontal load was approximately 3 mm to approximately 31 mm.

  When the vertical load is 1000 kgf, as shown in FIG. 9, after the horizontal displacement reaches approximately 21 mm, the horizontal load is reversed to the decreasing side by the restoring force of the elastic body 52 (see FIG. 4). . When the vertical load was 2000 kgf, as shown in FIG. 10, the horizontal load was reversed to the decreasing side by the restoring force of the elastic body 52 after the horizontal displacement reached approximately 31 mm.

  9 and 10, even when a structure having a weight of 1000 Kg or 2000 Kg is placed on the seismic isolation device 5, the seismic isolation device 5 does not receive a horizontal load due to the earthquake. It was shown that it can be absorbed by horizontal displacement and restored to a state where no horizontal load is applied. Therefore, the seismic isolation device 5 can absorb vibration energy stably even if it is compressed to a heavy object such as a building while being very compact.

It is a perspective exploded view showing a 1st embodiment of a base isolation structure of a structure by the present invention. It is a front view of the base isolation structure of the structure by the said 1st Embodiment. It is a longitudinal cross-sectional view of the base isolation structure of the structure by the said 1st Embodiment. It is sectional drawing of the seismic isolation apparatus by the said 1st Embodiment. It is a perspective external view of the seismic isolation apparatus by the said 1st Embodiment. It is a perspective external view of the seismic isolation apparatus by the said 1st Embodiment. It is a perspective external view of the seismic isolation apparatus by the said 1st Embodiment. It is the figure which showed the method of measuring the relationship of a horizontal load and a displacement, when a vertical load is given to the seismic isolation apparatus by said 1st Embodiment. It is a load displacement curve figure of the seismic isolation apparatus by the measuring method of FIG. It is a load displacement curve figure of the seismic isolation apparatus by the measuring method of FIG. It is a front view which shows 2nd Embodiment of the base isolation structure of the structure by this invention. It is AA arrow sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Foundation 2 Beam 3 Elastic metal fittings 3a and 3b A pair of refractive pieces 3c Bottom plate 4 Rigid metal fittings 4a and 4b A pair of attachment pieces 4c Center part 5 Seismic isolation device 51 Laminated body 52 Elastic body 53 Steel plate 53a Smooth surface layer

Claims (4)

A base isolation structure for a structure that slides and supports a foundation and a beam as a foundation of the structure,
An elastic metal fitting having a concave cross section that has a pair of opposing refracting pieces fixed to both side surfaces of the beam and that provides a bottom plate that couples the pair of refracting pieces;
Rigid metal fittings having a pair of attachment pieces fixed to the foundation on both wings, with the central portion raised in a groove shape,
A plurality of flat-shaped seismic isolation devices,
The elastic metal fitting is fixed to the beam with a predetermined interval between the bottom surface of the beam and the bottom plate,
The bottom plate is disposed in the center so that the bottom surface of the beam and the raised surface of the rigid metal fitting face each other,
The seismic isolation device is interposed between the bottom surface of the beam and the raised surface of the rigid metal fitting, and the seismic isolation device is interposed between the bottom surface of the bottom plate and the base surface,
The seismic isolation device regulates the steel plates so as to give a restoring force to a laminate formed by laminating a plurality of steel plates and stress from a direction orthogonal to the steel plate lamination direction of the laminates. And an elastic body to be connected,
A base isolation structure for a structure in which at least one smooth surface layer is provided between the plurality of steel plates.   The base isolation structure for a structure according to claim 1, wherein the base isolation device is further interposed between an opposing surface of the raised surface of the central portion and an upper surface of the bottom plate. A building construction method for slidingly supporting a foundation on which anchor bolts are buried and a beam as a foundation of the building,
A first step of forming the foundation;
A second step of installing the seismic isolation device according to claim 1 between a pair of the anchor bolts;
A third step of installing the elastic metal fitting according to claim 1 on the seismic isolation device;
A fourth step of installing the rigid fitting according to claim 1 on the bottom plate according to claim 1;
And a fifth step of installing the seismic isolation device according to claim 1 on the central portion according to claim 1.   A sixth step in which the seismic isolation device according to claim 1 is further interposed between an opposing surface of the raised surface of the central portion according to claim 1 and an upper surface of the bottom plate according to claim 1; The building construction method according to claim 3, comprising:

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