JPH03166464A - Vibration removing device - Google Patents

Abstract

PURPOSE:To reduce earthquake acceleration by disposing a table on a static member through low friction members in such a manner as to be horizontally movable, providing a spring mounting jig on each corner part thereof, mutually connecting the jigs by coil springs, and connecting the table and the member by a support metal fitting and a fixing jig. CONSTITUTION:A table 2 is placed on a slab 1 through a low friction member 3, L-shaped spring connecting jigs 101-104 are disposed on the respective angle parts of the table 2, projections 101'-104' are protruded on its respective bending leg parts, drawing springs 11 are fixed along the respective side walls of the table 2 and mutually connected. Short supporting metal fittings 101''-104'' extending in the diagonal direction of the table 2 from the respective bending part of each spring connecting jig 101-104 are protruded, and their end parts and the standing leg parts 501''-504'' of L-shaped fixing metal fittings 501-504 fixed to the slab 1 at intervals are mutually connected by jigs 71-74 which resists to drawing and shows no resistance to compression.

Description

[Detailed Description of the Invention] Immunity and Plates 1 The present invention provides a method for installing equipment installed on the floor of a building, etc., when an earthquake (or vibration in the building) occurs. This invention relates to a seismic isolation device for reducing seismic acceleration input to equipment, etc.

As one of this type of seismic isolation device, the present applicant has already proposed “
He proposed the invention of a "seismic isolation floor" (Special Publication No. 58-3131).
(Published in Publication No. 44).

Now, I would like to briefly explain this "earthquake isolation floor" that has already been proposed based on the drawings as follows. That is, in one embodiment of this "seismic isolation floor",
As shown in FIGS. 7 and 8 of the accompanying drawings, a horizontal pedestal 2 having an approximately square planar profile is placed on a fixedly arranged horizontal pedestal 1. Either the lower surface or both surfaces of the pedestal 2 is made of a low-friction material 3, or a roller is placed between the two surfaces, or
By arranging a low-friction element 4 such as a ball, it is placed so that it can easily move horizontally, and the equipment to be seismically isolated or the floor is loaded on this pedestal 2. Also, square shape (or round shape is also fine)
The pedestal 2 has an L-shape (
Alternatively, the spring connection jigs 101 to 10. may be round. is placed on the stand frame L, and each spring connection jig 10, to 104 is
The opposite ends of the legs holding the pedestal 2 are interconnected by tension coil springs 111 to 114 arranged along each side of the pedestal 2. Also, stand frame 1
On the top surface, there is a
Stopping jigs 7 are provided, and the tension coil springs 11. It is characterized in that the spring connection jigs 10 and 104 connected to each other are prevented from moving toward each other by 11 and 11, respectively. Further, the platform frame 1 is provided with a vertical wall 5 of a certain height around its periphery, which surrounds the platform 2 at an appropriate interval. A collar 6 having an appropriate width is horizontally extended inward from the upper side, and the inner periphery of the collar 6 overlaps the upper periphery of the pedestal 2 with a slight gap, covering the outer periphery of the pedestal 2. It is designed to do so. In this way, a dust-proof case is formed which substantially seals the pedestal 2 by the pedestal <1, the vertical wall 5, and the flange 6, and furthermore, the lower surface of the inner circumference of the flange 6 is marked with the normal position of the pedestal 2. Another stopper jig 8 is fixedly formed at a position corresponding to . In addition, in FIG. 4, reference numeral 13
This shows a damper connecting each spring connection jig 10, to 104 and each corner of the vertical wall 5 facing them. In this manner, in the seismic isolation floor having such a structure, when the pedestal 2 moves horizontally relative to the pedestal frame 1 during an earthquake, the spring connection jig lO in the direction of movement
move together with the pedestal 2, whereas the spring connection jigs 10 in the opposite direction cannot move due to the stop jigs 7.8. Each tension coil spring 11 whose end portion is fixed is stretched, and thus, by stretching the corresponding tension coil spring 11, a restoring force is applied in that direction. So, in Figures 4 and 5,
The frame 2 is shown moved to the right with respect to the frame 1, and it can be seen that the tension coil springs 112 and 114 extend in that direction. In addition, in this seismic isolation floor, the related tension coil springs 11 are extended not only in the direction of such seismic force but also in other horizontal seismic forces, so that the pedestal It is designed to effectively provide restoring force to both the translational and rotational movements of 2. In addition, this seismic isolation floor can be used as a large-area seismic isolation floor by applying several sets of it, for example, the 7th seismic isolation floor.
As shown in the figure, each seismic isolation floor is constructed by arranging several sets of seismic isolation units 30 and supporting a large-area pedestal 32 with these and low-k friction material units 31.

However, in the seismic isolation floor that has already been proposed, the pedestal 2 is installed in such a way that the collar 6 and the stop jig 7 do not come into spatial contact during movement during an earthquake. There is a need. As a result, the following construction problems were found to be difficult. That is, 1. 2. It is difficult to install the pedestal 2 and adjust its height position.26 This may reduce the reliability of its operation.3. It is not possible to reduce the gap between the top surface of the pedestal 2 and the bottom surface of the collar 6, and between the bottom surface of the pedestal 2 and the top surface of the stopper jig 7, so the height of the unit 1 is reduced. 4. Not being able to do things. The stand frame 1 is large in size, heavy, and expensive.

Therefore, the object of the present invention is to obtain an improved seismic isolation device that can solve the above-mentioned problems in seismic isolation floors that have already been proposed. In the present invention, in order to solve this problem, a planar contour such as a square shape or a round shape is placed on a horizontal stationary member such as a slab through a low-friction material. The pedestal is arranged so as to be relatively horizontally movable, and the pedestal has a substantially L-shaped pedestal having short legs at each corner thereof, which intersect at each corner and run along each side. A spring mounting jig having a cross section of Furthermore, each spring mounting jig and the slab are connected to each other by a stopper jig that resists tension but does not resist compression. It is something to do. Kichiho-1 Hereinafter, the present invention will be explained in detail based on FIG. 1 of the accompanying drawings showing an embodiment thereof. In addition, in the following explanation and drawings, the same reference numerals are used for elements that are the same or substantially the same as the elements in the "seismic isolation floor" that has already been proposed and illustrated and explained above. is used.

First, as shown in FIGS. 1 and 2, in the present invention,
As a counterpart to the platform 1 in the previously proposed structure, the horizontal slab 1 forming the floor of the building where the seismic isolation device according to the present invention is to be installed can be used as is, and compared to the conventional structure. is the needed stand frame 1
By omitting the , it is intended to reduce the overall height of the device.

Next, on this slab etc. 1, a board-shaped pedestal 2 having a certain thickness and having an approximately square planar outline is placed.
is mounted via several sets of low-friction materials or low-friction elements 3 so that it can easily move horizontally with respect to the slab or the like 1. In addition, each corner of this pedestal 2 has a cross section formed by bending a band-shaped metal plate having a certain width and length at right angles to the surface of the band-shaped plate at the central part of the longitudinal direction. Spring connection jig 1 with an almost L-shaped surface
0. 104 are arranged so that the width direction thereof coincides with the thickness direction of the pedestal 2. In addition, each spring connection jig 10+~
Each folded leg portion of 10< has a pair of protrusions 10 near the folded corner and perpendicular to the mask.
,゜~10,' are projected, and these protrusions 10l'~
The tension coil springs 11 arranged along each side wall of the 104° pedestal 2 are connected to each other by being fixed at each end thereof to opposing sides of the pedestal 2. shall be.

Further, from each bending portion of each stiffener connecting jig 10, to lO, one short length support fitting 10. ``~1.04'' is provided protrudingly, and on top of the slab etc., on the diagonal extension of the pedestal 2, spaced apart from the ends of the support fittings 101''~10,''. , a fixing metal fitting 50 whose cross section is approximately L-shaped, which is formed by bending a band-shaped metal plate having a certain width and length at right angles. ~50. and shall be appropriately fixed to the slab or the like 1 at the respective horizontal leg portions 501' to 50,'. stop? , the ends of each of the support fittings 10I' to 104', and the fixing fittings 50, to
50. The upright leg portions 501''-504'' of the are secured, respectively, by stoppers 71-7, made of a suitable material that exhibits resistance to tension but not compression. , shall be interconnected.

Although the present invention has the above-mentioned structure, its operation and effect are substantially the same as the seismic isolation floor already proposed as described above. That is, when the frame 2 moves relative to the slab or the like 1 in the vertical direction, as seen in FIG. and 10, is the pedestal 2
The spring connecting jigs 10 and 104, which move in the opposite direction to the moving direction, are attached to the fixing jigs 7 and 74 fixed to the slab etc. 1.
Since they are connected 3!8 times through the mount 2, they cannot move in the direction of movement of the pedestal 2. Therefore, each horizontal tension coil spring 11 whose respective ends are connected to these spring connection jigs 10I and 10I and 102 and 103 is connected to the opposing spring connection jigs 101 and 10A. 02 and 10■ and 1
0, respectively. Therefore, the pedestal 2 is given a restoring force by these stretched tension coil springs 11. In addition,
In this case, the spring constant of the tension coil spring 11 must be set in advance to be smaller than the natural frequency of the horizontal spring system.

In addition, although the case where the pedestal 2 moves relative to the slab 1 in the direction of its side wall is explained above, the movement of the pedestal 2 is limited to movement in this direction. Rather, it is clear that it effectively damps all translational and rotational movements on a plane. Furthermore, by applying a pretension force to the tension coil spring 11 in advance, the pedestal 2 can be configured to start moving only when a preload corresponding to the set pretension force is applied. ．． FIG. 3 shows the relationship between the preload, static friction coefficient, and displacement of the tension coil spring 11 using linear factors.
Displacement ), and the total mass of the upper part of the low-friction element 3 is (N), the pedestal 2 will not move unless the input acceleration Acx becomes ^cx> (Fo + Ffr)/Il+.

Note that the measurement results of the restoring force characteristics according to one embodiment of the device of the present invention are as follows: pretension force F0 = 49.0 kgf, static friction force Ff
The case of r=9.0 kgf is shown in FIG.

In addition, FIGS. 5 and 6 show that the fastening jigs 7, to 74 shown in FIGS. 1 and 2 are made of a material such as a chain or rope that is resistant to tension but not resistant to compression. This shows another example of the present invention used. It is easy to see that this embodiment also exhibits the same functions and effects as those of the previous embodiment. Furthermore, the present invention uses the seismic isolation device according to this embodiment as a seismic isolation unit, and several sets of these seismic isolation units are installed in a slab or the like.
A common pedestal 32 having a large area is placed on each of these pedestals 2 via appropriate means, and large equipment etc. to be seismically isolated are mounted on this pedestal 32. You can also set it up. This is shown schematically in FIGS. 2 and 6. Since the present invention has the above-described configuration and operation, compared to the previously proposed seismic isolation floor, (1) there is no inset part between each member constituting the device; (2) This also improves the reliability of the device. (3) The height of the device is lower, so space can be used more effectively. (4) It has many advantages such as lower material costs, manufacturing costs, installation costs, etc.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing one embodiment of the present invention, and FIG. 2 is a plan view showing one embodiment of the present invention.
A side view thereof, FIG. 3 is a diagram showing the relationship between the preload, static friction force, and displacement of the tension coil spring, and FIG. 4 is an experimental result of one example of the embodiment shown in FIGS. 1 and 2. FIG. 5 is a plan view showing another embodiment of the present invention, FIG. 6 is a side view thereof, and FIG. 7 is a diagram corresponding to FIG.
FIG. 8 is a plan view showing one embodiment of the seismic isolation floor already proposed by the present applicant, and FIG. 9 is a side view of the seismic isolation floor, and FIG. This is a side view of a large-area seismic isolation floor constructed as a seismic unit. DESCRIPTION OF SYMBOLS 1... Slab etc., 2... Frame, 7... Stopping jig, 101-104... Spring mounting jig, 11...
Tension coil spring, 50...Fixing metal fittings.

Claims (1)

[Scope of Claims] 1. A pedestal having an appropriate planar profile is disposed on a horizontal stationary member such as a slab through a low-friction material so as to be relatively horizontally movable, and this pedestal includes: A spring mounting jig having a substantially L-shaped cross section with short legs that intersect at each corner and run along each side is disposed at each corner, and Each spring installation jig is
The legs facing each other along each side wall of the frame are interconnected by tension coil springs, and each spring mounting jig and a slab etc. are connected to each other with resistance to tension, but A seismic isolation device characterized by being connected to each other by stop jigs that exhibit no resistance to compression. 2. The seismic isolation device according to claim 1, wherein each stop jig is arranged substantially in the direction of each diagonal line of the mount. 3. The seismic isolation device according to claim 1 or 2, wherein a large number of seismic isolation devices are arranged on a slab, and the pedestals of these seismic isolation devices support a common pedestal having a large area.