JP2007298082A - Base isolation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve installation work performance and base isolation performance in a base isolation device. <P>SOLUTION: The device includes: a device supporting base 2 for supporting the whole of a device casing 1; a mounting base 6 mounted in a mounting floor 3 of the device casing 1 and keeping a supported part 4 of a device supporting base 2 supported by a dish-like receiving part 5 in which a bottom provided to each supported part 4 is formed of a curvature surface; and a biasing spring 7 for biasing the device supporting base 2 in a prescribed initial position on the mounting base 6. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a seismic isolation device.

  As a seismic isolation device for absorbing vibration during an earthquake, the one described in Patent Document 1 is known. In this conventional example, a housing for holding a sphere is fixed to the bottom wall of the structure (device casing). On the other hand, a saucer is fixed to the ground (installation floor surface) which is a base, and the apparatus housing is supported at a predetermined position with a sphere supported by the saucer.

  When the installation floor is moved horizontally due to an earthquake, the sphere on the equipment casing rolls on the saucer, allowing relative movement between the equipment casing and the installation floor, and applying an impact force to the equipment casing. To prevent.

The bottom surface of the saucer is formed with a low curvature surface in the center, and absorbs the translational energy while moving relative to the installation floor surface of the equipment housing, and returns to its original position by the restoring force of the tension spring after the earthquake. To do.
Japanese Patent Laid-Open No. 9-25737

  However, in the above-described conventional example, when installing the installation floor surface, it is necessary to separately arrange a plurality of trays on the installation floor surface in correspondence with the housing fixing location of the apparatus housing, and the installation workability is inferior. There is. Further, since the fixing area of the receiving tray to the installation floor is small, each receiving tray needs to be fixed to the installation floor using an anchor bolt or the like, which also causes deterioration in installation workability.

  Further, since the tension spring is mounted in the tray unit, the storage space for the tension spring is also reduced, and the tension spring needs to be miniaturized. On the other hand, in order to effectively absorb the lateral movement force at the time of an earthquake and not give a shock to the device housing, the tension spring needs to have a characteristic that the spring force changes gently with respect to the change of the deflection. . However, in the case of a small tension spring, taking a coil spring as an example, the spring constant becomes excessive to obtain sufficient spring force due to restrictions on the wire diameter, center diameter, number of turns, etc. The absorption effect cannot be expected. As a result, in the above-described conventional example, the tension spring can be expected only to have a function of returning to the origin, and cannot have a high impact energy absorption capability.

  The present invention has been made to eliminate the above drawbacks, and an object of the present invention is to provide a seismic isolation device having good installation workability and good seismic isolation performance.

  The seismic isolation device is formed by movably supporting a device support 2 on a mounting base 6 installed on the installation floor 3, and the device housing 1 is fixed on the device support 2 by an appropriate means. The Installation in the seismic isolation device is completed simply by installing the mounting base 6 on the installation floor surface 3 and fixing the device housing 1 on the device support 2 supported on the installation base surface 3. Will be better. In addition, the mounting base 6 that supports the apparatus support 2 having a size capable of supporting the entire apparatus housing 1 has a large installation area with respect to the installation floor surface 3 and is therefore always installed using anchor bolts or the like. It is not necessary to fix to the floor surface 3, and it is possible to prevent misalignment, overturning, and the like simply by placing on the installation floor surface 3.

  Furthermore, since the positional relationship between the tray of the mounting base 6 and the supported portion 4 on the side of the apparatus support base 2 is accurately determined in advance, the mounting position of the housing on the side of the apparatus housing 1 as in the conventional example. Therefore, the troublesome work of fixing each tray to the installation floor 3 in correspondence with the above is eliminated.

  In addition, since a wide space on the mounting base 6 can be used as an arrangement space for the urging spring 7, the degree of freedom in setting the spring constant of the urging spring 7 is increased. As a result, the biasing spring 7 can function as a moving energy absorber of the apparatus housing 1.

  According to the present invention, the installation workability can be improved and the seismic isolation performance can be improved.

  As shown in FIGS. 1 and 2, the seismic isolation device has a mounting base 6 and a device support 2 arranged on the mounting base 6. The mounting base 6 is simply placed on the installation floor surface 3 depending on the surface state of the installation floor surface 3, or is fixed to the installation floor surface 3 using a fixing means such as an adhesive or a nail.

  The mounting base 6 has a rectangular shape that is almost the same size as the apparatus housing 1, and the receiving portions 5 are formed at the four corners. The receiving part 5 has a concave shape with a spherical bottom surface, and is arranged so that the center is the lowest height.

  Sufficient strength and rigidity are given to the bottom surface of the receiving part 5 so that depression or the like does not easily occur when the supported part 4 described later is placed. In the figure, the mounting base 6 is shown in the case where the receiving part 5 is formed as a part of the main body part. However, even if the receiving part 5 that satisfies the above-mentioned conditions such as strength is connected to the main body part, Good.

  A spring connector 9 for connecting one end of a biasing spring 7 to be described later is fixed to the mounting base 6. As shown in FIG. 2C, the spring connector 9 is a piece body having a U-shaped cross section, and is connected to the mounting base 6 so as to be horizontally rotatable around the axis C.

  The apparatus support base 2 is a rectangular frame member having a size substantially equal to that of the mounting base 6 and includes leg insertion holes 2a at four corners. After the installation leg 1a is inserted into the leg insertion hole 2a, the apparatus housing 1 is fixed so as not to move unreasonably by means.

  Further, a bowl-shaped supported portion 4 is erected on the back surface of the apparatus support base 2. As shown in FIG. 2, the supported portion 4 has an axis passing through the center of the spherical surface of the receiving portion 5 in a state where the center of the apparatus support base 2 overlaps at a position (initial position) that coincides with the center of the mounting base 6. It is arranged at the position to do. The free ends of these supported portions 4 are formed in a spherical shape, and can be moved on the bottom surface of the receiving portion 5 with appropriate sliding resistance.

  Reference numeral 7 denotes an urging spring, which is attached to each supported portion 4 from four spring couplers 9 arranged in the center portion, and urges the device support 2 in the center direction. As the urging spring 7, a tension coil spring or the like can be used. In this embodiment, a constant load spring (conston spring) having a substantially constant restoring force with respect to the amount of bending is used. As shown in FIG. 2C, the biasing spring 7 is fixed by connecting a connecting piece 10 fixed to the end of the supported portion 4 to the supported portion 4 so as to be horizontally rotatable. In FIG. 2C, reference numeral 11 denotes a retaining ring for preventing the connecting piece 10 from falling off from the supported portion 4.

  Therefore, in this embodiment, when the installation floor 3 vibrates due to an earthquake, the supported portion 4 absorbs the roll while moving on the bottom surface of the receiving portion 5 as shown in FIGS. . At the same time, the urging spring 7 absorbs the movement energy while expanding and contracting in the direction of displacement between the apparatus support base 2 and the mounting base 6, and reduces the movement speed to prevent the shock to the apparatus housing 1.

  FIG. 4 shows another embodiment of the present invention. In the following description, components that are substantially the same as those of the above-described embodiment are denoted by the same reference numerals in the drawings, and description thereof is omitted. In this embodiment, the apparatus support base 2 is provided with a slit 2b in a horizontal posture, and the connecting piece 10 of the biasing spring 7 is inserted therein. The connecting piece 10 is prevented from coming off by a bolt 12 screwed into the apparatus support base 2 and can be rotated horizontally (see FIG. 5B).

  Moreover, as shown in FIG.5 (c), the to-be-supported part 4 is formed in the dish shape which the ceiling surface which reversed the receiving part 5 by the side of the attachment base 6 becomes a spherical surface. The supported portion 4 is arranged such that the spherical center of the ceiling surface and the spherical center of the receiving portion 5 are located on the same vertical line at the initial position. The supported portion 4 is placed on a sphere 8 that is slidably placed on the receiving portion 5.

Therefore, in this embodiment, when the installation floor surface 3 rolls due to an earthquake, as shown in FIG. 5D, the apparatus floor 1 and the installation floor surface 3 that are intended to remain in the original position follow the side. The displacement between the mounting bases 6 moving in the direction is absorbed by the sphere 8 rolling and the relative movement of the two, so that the impact force on the device housing 1 can be avoided. Due to the shape, a force in the direction of returning to the center position is applied to the sphere 8 shifted from the center from both the receiving portion 5 and the supported portion 4. As a result, the ability to absorb seismic energy at the time of rolling the sphere 8 is high, and the return force to the initial position at the end of the earthquake can be increased.

It is a figure which shows this invention, (a) is a perspective view, (b) is a side view. It is a figure which shows a seismic isolation apparatus, (a) is a top view, (b) is the 2B-2B sectional view taken on the line of (a), (c) is an enlarged view of a to-be-supported part. It is a top view which shows seismic isolation operation | movement. It is a figure which shows other embodiment of this invention, (a) is a perspective view, (b) is a top view. 5A is a cross-sectional view taken along line 5A-5A in FIG. 4B, FIG. 5B is an enlarged view showing a connecting portion of the connecting piece to the device support base, and FIG. The enlarged view which shows a to-be-supported part, (d) is a figure corresponding to (c) which shows seismic isolation operation | movement.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Apparatus housing 2 Apparatus support 3 Installation floor 4 Supported part 5 Receiving part 6 Mounting base 7 Biasing spring 8 Sphere

Claims (3)

A device support for supporting the entire device housing;
An installation base that is installed on the installation floor of the apparatus housing and that is supported by a dish-shaped receiving part whose bottom surface is a curved surface provided for each supported part of the supported part of the apparatus support base;
A seismic isolation device having a biasing spring for biasing the device support to a predetermined initial position on the mounting base.   The seismic isolation device according to claim 1, wherein the biasing spring is formed by a constant load spring. The supported part is formed in a shape in which a dish whose ceiling surface is a curved surface is turned down,
The seismic isolation device according to claim 1 or 2, wherein a sphere is interposed between the receiving portion and the supported portion so as to freely roll.

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