JP4637037B2 - Seismic isolation device - Google Patents

Description

  The present invention relates to a seismic isolation device installed between a supported body side and a support body side. More specifically, the present invention relates to an improved seismic isolation device that prevents a yawing phenomenon derived from an upper structure on the supported body side together with the seismic isolation function, and obtains a more stable seismic isolation function.

2. Description of the Related Art Conventionally, rolling-type seismic isolation devices using rolling elements such as a sphere, a roller, or a wheel configured to roll on a linear track along a guide rail are widely known. In the case of a seismic isolation device using rolling elements that roll on a straight track along this guide rail, there is directionality in the seismic isolation action, so the combination of these guide rails and rolling elements It has been widely known that the seismic isolation units are arranged so as to be able to cope with external forces in all directions by arranging them in a state orthogonal to each other (see Patent Document 1 and Patent Document 2).
Japanese Examined Patent Publication No. 6-74609 JP 2005-48837 A

  FIG. 13 is a schematic front view illustrating a base-isolated building, and FIG. 14 is a schematic plan view illustrating an arrangement state of the base isolation device. As shown in the figure, in the case of the base-isolated building 101 of this example, since the second-floor portion 102 is shifted from the center, the position of the center of gravity G of the base-isolated building 101 as a whole is four base-isolated in this example. It does not coincide with the support center C for the base isolation building 101 supported by the entire base isolation device formed by the units 103a to 103d. Therefore, for example, as shown in FIG. 14, when an external force F such as seismic force is applied, the external force is applied to the center of gravity G eccentric to the support center C on the support side on the seismic isolation building 101 side. As a result, a rotational moment about the support center C acts on the base-isolated building 101. As a result, the seismic isolation building 101 as the upper structure rotates around the vertical axis passing through the support center C, and a so-called yawing phenomenon occurs.

By the way, in the case of the said prior art, since the seismic isolation unit was arrange | positioned in the state orthogonal to each other, although it can respond to the external force of all directions, it was not enough about the countermeasure against the above-mentioned yawing phenomenon. Therefore, rolling elements consisting of a set of two wheels are arranged for each of the guide rails installed opposite to each other in parallel, and by providing a flange on each of these wheels, the track restraint is enhanced and the yawing phenomenon is prevented. There has also been a proposal (see Patent Document 3). However, in the case of this conventional technique, not only is the structure complicated and the cost is high, but also the form that can be applied is limited, so that the degree of freedom in application is narrowed. there were.
Japanese Patent No. 3233915

  The present invention has been developed in view of the above-described conventional technical situation, and provides a seismic isolation device that can accurately prevent yawing phenomenon with a simpler configuration, thereby reducing the cost and application. The purpose is to contribute to the expansion of the degree of freedom.

In order to solve the above problems, in the invention of claim 1, a lower guide rail and an upper guide rail each provided with guide grooves each having an inclined surface opposed to a V shape having a linear guide function at least in plan view, A seismic isolation unit comprising two or more spherical rolling elements that are engaged with the guide grooves of the upper and lower guide rails so as to be separated from each other and roll on the inclined surface is orthogonal to the cross. Arranged so that the intersection of the seismic isolation units is always positioned between two rolling elements spaced apart from each other and constituting the lower seismic isolation unit. The technical means of suppressing the yawing phenomenon of the superstructure by adopting the suppressing action against the relative rotation in the horizontal direction between the upper and lower guide rails. Incidentally, the invention of claim 1 is directed to a lower guide rail and an upper guide rail each having a guide groove composed of opposed inclined surfaces having a linear guide function in a plan view as viewed from above. The case where the guide rail and the upper guide rail include a vertical displacement for the return function is also included. In short, the rolling element consisting of two or more spheres rolling the inclined surface above with engagement in a state of being separated into the guide groove of the lower guide rail and the upper guide rail has a linear guide functions in a plan view As long as the wedge-like orbital restraining force on both guide rails suppresses the relative rotation in the horizontal direction between the upper and lower guide rails, the yawing phenomenon of the upper structure may be suppressed. Each of the upper and lower guide rails can be configured by using two or more rail members arranged on a straight line .

According to the present invention, the following effects can be obtained.
(1) The upper part of the upper and lower guide rails having a linear guide function are engaged with a guide groove formed of opposed inclined surfaces by engaging two or more rolling elements separated from each other in a separated state. It is possible to provide a seismic isolation device with a simple structure and good seismic isolation performance that can accurately suppress the yawing phenomenon of a structure.
(2) Since the configuration is extremely simple, it is possible to reduce costs and to increase the degree of freedom in application.
(3) Since the intersection of the upper and lower seismic isolation unit is always configured so as to be positioned between the two rolling elements spaced constituting the seismic isolation unit of the lower two of the load of the upper structure is always spaced Acting between the rolling elements, the apparatus can be prevented from overturning, and the excessive pulling force with respect to the fixing member of the guide rail is eliminated, so that more stable seismic isolation performance can be obtained.

The seismic isolation device according to the present invention is installed between the lower structure side such as the ground which is the support side and the upper structure side such as the case which is the supported body side as a seismic isolation device for various buildings. It can be widely applied. Depending on the case, it can be installed in the middle of the housing. In addition, for example, when installed under the floor of a room in an existing or new building such as a computer room to protect hardware equipment in the room, or installed in an existing or new building The present invention can be widely applied to the case where it is installed between a superstructure for supporting an exhibit to be displayed and a floor portion to protect the exhibit such as a work of art. A spherical body is used as the rolling element. In addition, as for the guide rail, a configuration is used in which the rolling element is linearly guided along grooves formed by inclined surfaces facing each other such as a V-shaped cross section. In short, at least a guide rail provided with guide grooves made of opposed inclined surfaces having a linear guide function in a plan view as viewed from above, and linearly guided by the guide rails and rolled on the inclined surfaces if a combination of rolling elements consisting to that sphere, it is possible to employ the appropriate form. Each of the upper and lower guide rails may be constituted by one continuous rail member on the upper and lower sides, or may be constituted by using two or more rail members arranged on a straight line.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a first embodiment of the present invention. FIG. 1 is a front view showing the installation state, and FIG. 2 is a plan view showing a part of the seismic isolation device. In the figure, reference numeral 1 denotes a seismic isolation device 1 according to this embodiment, which is installed between a lower structure 2 and an upper structure 3 and insulates between the lower structure 2 and the upper structure 3 and is exempted. It will play a seismic function. As shown in the drawing, the seismic isolation device 1 according to the present embodiment was arranged in a straight line by two each along the cross-shaped lower surface and the upper surface with the intermediate member 4 made of a cross-shaped flat plate in between. The seismic isolation units 5 and 6 and the seismic isolation units 7 and 8 are arranged in an orthogonal state. 3 to 5 are enlarged views showing the structure of the main parts of the seismic isolation units 5 to 8, FIG. 3 is a front view thereof, FIG. 4 is a side view thereof, and FIG. . As shown in the figure, the seismic isolation units 5 to 8 are arranged between the lower rail member 9 and the upper rail member 10 each having a V-shaped groove portion and the upper and lower rail members 9 and 10 in this embodiment. And a combination with a sphere 11 as a rolling element that is linearly guided along a V-shaped groove. Thus, in the case of the present embodiment, a set of two lower rail members 9 which are respective constituent elements of the seismic isolation unit 5 and the seismic isolation unit 6 arranged linearly below the intermediate member 4. A lower guide rail having a linear guide function is constituted by the combination, and a straight line is similarly obtained by combining the two upper rail members 10 which are the respective components of the seismic isolation unit 5 and the seismic isolation unit 6. An upper guide rail having a typical guide function is configured. Further, two rolling elements separated from each other are constituted by the two spheres 11 which are the respective constituent elements of the seismic isolation unit 5 and the seismic isolation unit 6. Similarly, it is arranged in an orthogonal state by a combination of two lower rail members 9 which are constituent elements of the seismic isolation unit 7 and the seismic isolation unit 8 arranged linearly on the upper part of the intermediate member 4. The other lower guide rail is constituted, and the other upper guide rail is constituted by a combination of the two upper rail members 10 which are the respective constituent elements of the seismic isolation unit 7 and the seismic isolation unit 8. At the same time, two rolling elements separated from each other are constituted by the two spheres 11 which are the respective constituent elements of the seismic isolation unit 7 and the seismic isolation unit 8.

  Next, the seismic isolation operation of the seismic isolation device 1 according to the first embodiment will be described. FIG. 6 is an operation explanatory diagram showing an operation state of the seismic isolation device 1. As shown in the figure, when a horizontal external force F acts on the upper structure 3, the spheres 11 of the seismic isolation unit 5 and the seismic isolation unit 6 are V-shaped on the upper and lower rail members 9, 10, respectively. The upper structure 3 moves relative to the lower structure 2 in the horizontal direction by rolling linearly while engaging with the grooves. By the way, at the time of this relative movement, as described above, it is positioned between the center of gravity G of the upper structure 3 and the support center C on the support side constituted by each seismic isolation device 1 that supports the upper structure 3. When there is a deviation, a rotational moment that causes the yawing phenomenon of the upper structure 3 acts, but in this embodiment, the upper and lower rail members 9 are in a state where the spheres 11 are separated from each other. , 10 is engaged with the V-shaped groove, and the occurrence of the yawing phenomenon is suppressed against the rotational moment. That is, based on the trajectory restraining force by the spheres 11 that are spaced apart from each other, the lower guide rail that is a combination of the two lower rail members 9 arranged on a straight line, and the two upper parts arranged on the straight line Since the positional relationship with the upper guide rail composed of the combination of the rail members 10 is reliably maintained, and the horizontal rotation between the lower guide rail and the upper guide rail is accurately suppressed, it is extremely simple. Regardless of the configuration, the yawing phenomenon of the upper structure 3 can be accurately eliminated. Incidentally, in the above case, the seismic isolation units 5 to 8 have the same suppression function against the yawing phenomenon. Furthermore, as shown in the drawing, the intersection between the lower seismic isolation units 5 and 6 and the upper seismic isolation units 7 and 8 is always between two spaced spheres 11 constituting the lower seismic isolation units 5 and 6. Therefore, the load of the upper structure 3 always acts between the two spheres 11 as the rolling elements that are separated from each other, so that the seismic isolation device 1 can be prevented from overturning and the lower part constituting the guide rail. The excessive pulling force with respect to the fixing member of the rail member 9 is eliminated, and more stable seismic isolation performance can be obtained.

  7 and 8 show a second embodiment of the present invention. FIG. 7 is a front view showing the installation state, and FIG. 8 is a plan view showing a part of the seismic isolation device. The seismic isolation device 12 according to the present embodiment uses a seismic isolation unit similar to the seismic isolation units 5 to 8, and between the ends of the lower rail members 9 constituting the seismic isolation units 5 and 6. And the end portions of the upper rail member 10 are connected by connecting members 13 and 14 to form a lower guide rail and an upper guide rail, and the seismic isolation units 7 and 8 are also connected in the same manner, The upper guide rail is configured, and further, they are arranged in an orthogonal state as shown in the figure and are combined in a cross shape so as to achieve the same function as the first embodiment. . In the present embodiment, when the upper and lower guide rails are arranged in an orthogonal state, the intermediate member is not used, but the case is directly coupled. Incidentally, it goes without saying that the lengths of the lower rail member 9 and the upper rail member 10 can be adjusted according to circumstances.

  9 and 10 show a third embodiment of the present invention. FIG. 9 is a front view showing the installation state, and FIG. 10 is a plan view showing a part of the seismic isolation device. The seismic isolation device 15 according to the present embodiment employs a combination of a lower guide rail 16 and an upper guide rail 17 made of a single long rail member, and the lower guide rail 16 and the upper guide rail 17. By arranging two or more spherical bodies 18 as rolling elements in a state of being separated from each other, a lower seismic isolation unit 19 and an upper seismic isolation unit 20 are configured, and as shown in the drawing, these lower seismic isolation units 19 And the upper seismic isolation unit 20 are arranged in an orthogonal state and coupled in a cross shape so as to achieve the same function as in the first embodiment. That is, in the first and second embodiments, the guide rails for supporting and guiding the two spheres 11 are constituent elements of the two sets of seismic isolation units arranged on a straight line. Although the case where it comprised by combining and using the upper and lower rail member of a book was shown, a present Example uses the 1 set of seismic isolation unit which consists of an elongate upper and lower rail member, and guides which consist of one rail member The case where it comprises so that the two spherical bodies 18 can be supported and guided simultaneously with a rail is shown.

  FIG. 11 is a front view showing an installation state of a modified example of the third embodiment. Locking portions 21 to 23 are provided at the center and both ends of the lower guide rail 16 and the upper guide rail 17. The movement range of the sphere 18 is restricted, so that the intersection of the upper and lower seismic isolation units 19 and 20 is always between two spheres 18 as separated rolling elements constituting the lower seismic isolation unit 19. The seismic isolation device 15 is positioned so as to avoid falling. Incidentally, with respect to this locking portion, only the locking portion 21 installed at the center between the two spheres 18 is effective in restricting the movement range of the spheres 18. The present modification can also be effectively applied to the second embodiment.

  FIG. 12 is a perspective view showing a practical embodiment to which the present invention is applied, in which the basic configuration of the second embodiment is applied. As shown in the drawing, the seismic isolation device 24 according to the present embodiment is in a state where two seismic isolation units 26 and 27 are connected to the lower part of the intermediate member 25 with the intermediate member 25 formed of a cross-shaped frame interposed therebetween. In addition to being installed, it is configured by installing two seismic isolation units 28 and 29 in the upper part. In the figure, reference numeral 30 denotes a sphere as a rolling element.

It is the front view which showed the installation state of 1st Example of this invention. It is the top view which showed the same Example. It is a front view which expands the structure of the principal part of a seismic isolation unit. It is the side view which showed the seismic isolation unit. It is AA sectional drawing which showed the seismic isolation unit. It is operation | movement explanatory drawing which showed the operation state of the seismic isolation apparatus which concerns on the said 1st Example. It is the front view which showed the installation state of 2nd Example of this invention. It is the top view which showed the part of the seismic isolation apparatus of the Example. It is the front view which showed the installation state of 3rd Example of this invention. It is the top view which showed the part of the seismic isolation apparatus of the Example. It is the front view which showed the installation state of the modification of the Example. It is the perspective view which showed the practical Example to which this invention is applied. It is a front view of a base-isolated building for demonstrating a yawing phenomenon. It is an arrangement plan concerning a seismic isolation device for explaining a yawing phenomenon.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Seismic isolation device, 2 ... Lower structure, 3 ... Upper structure, 4 ... Intermediate member, 5-8 ... Seismic isolation unit, 9 ... Lower rail member, 10 ... Upper rail member, 11 ... Sphere, 12 ... Exemption Seismic device 13, 14 ... connecting member, 15 ... seismic isolation device, 16 ... lower guide rail, 17 ... upper guide rail, 18 ... sphere, 19 ... lower seismic isolation unit, 20 ... upper seismic isolation unit, 21-23 ... Locking part, 24 ... Seismic isolation device, 25 ... Intermediate member, 26-29 ... Seismic isolation unit, 30 ... Sphere

Claims (2)

A lower guide rail and an upper guide rail each provided with a guide groove having a V-shaped inclined surface having a linear guide function at least in a plan view, and spaced apart from each other by the guide grooves of the upper and lower guide rails. A seismic isolation unit comprising two or more spherical rolling elements that engage in a state and roll on the inclined surface is arranged in a cross-like shape, and the seismic isolation units The intersection is always located between two spaced apart rolling elements that form the lower seismic isolation unit, and acts in the horizontal direction between the upper and lower guide rails that act via the separated rolling elements. A seismic isolation device configured to suppress a yawing phenomenon of an upper structure by an effect of suppressing relative rotation.   2. The seismic isolation device according to claim 1, wherein each of the upper and lower guide rails is composed of two or more rail members arranged on a straight line.

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