JP2829631B2 - Vertical seismic isolation device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical seismic isolation used mainly in a building or the like for the purpose of protecting office automation equipment and the like that are susceptible to vibrations, particularly from vertical vibrations caused by an earthquake or the like. Related to the device.

2. Description of the Related Art With the remarkable spread of office automation equipment in recent years, OA equipment that is vulnerable to vibration is used in buildings to protect from damage caused by earthquakes, especially vertical vibrations, on an individual scale. Research and development of vertical seismic isolation devices have been promoted, and the results have been described in, for example, Japanese Patent Application No. 63-821 and drawings.

The configuration will be briefly described with reference to FIGS. 6 and 7.

B) The hollow guide posts a standing upright at the four corners are respectively joined to both ends of two hollow horizontal guide frames b arranged so as to face each other in parallel in the horizontal direction.

B) Two movable spring frames c, c are respectively erected between the two lateral guide frames b, b so as to be able to freely move in parallel, and tension is applied between the two movable spring frames c, c. The spring d is connected. A damper e that works in conjunction with the movable spring frame c at a position where the movable spring frame c has moved by a fixed amount is also provided.

(C) The seismic isolation floor frame slab f is arranged in a horizontal posture so as to be able to move vertically in parallel within a plane surrounded by the guide posts a at the four corners. The four corners of this seismic isolation floor frame plate f are supported by roller units g that move up and down along the guide posts a, and one end of a connecting body m wound around a guide wheel h at the upper end of each guide post a is The other end of the connecting member m is fixed to a corresponding movable spring frame c.

Problems to be Solved by the Present Invention The vertical seismic isolation device according to the above-mentioned prior application has a small clearance of the roller unit g that moves vertically along the guide support a, and also tends to cause deviation. If the accuracy of the perpendicularity and the parallelism in the posture of the a and the seismic isolation floor frame plate f are not sufficiently secured, the clearance will immediately deviate, causing a local increase in the coefficient of friction and a lack of smooth movement. Or stuck.

Also, since the number of rollers in the roller unit g is large,
When the seismic isolation floor frame f is locked, it may not move.

However, if the roller inside the roller unit g (the side near the base-isolated floor frame slab f) is removed and the number is reduced, then the leveling support and restraining force of the base-isolated floor frame slab f are insufficient. And rocking becomes easier. Further, if the center of gravity of a loaded article such as an OA device placed on the seismic isolation floor frame plate f shifts even a little, there is a problem that the seismic isolation floor frame plate f is inclined.

Further, since the two spring frames c and c, each of which connects a large number of springs d, move freely, the movement of each spring frame tends to be unbalanced. There is a drawback that it is easy to promote, and these are issues to be solved.

Means for Solving the Problems As means for solving the problems of the prior art,
The vertical seismic isolation device according to the present invention is, as shown in the preferred embodiment in FIGS. 1 to 5 of the drawings, a) hollow guide posts 3 erected at the four corners, respectively, in the horizontal direction. 2 arranged in parallel with each other
It is joined to both ends of the hollow horizontal guide frames 2,2 of the book.

B) One spring frame 6 is fixed between the two lateral guide frames 2, 2, and the other spring frame 7 is installed so as to be able to move freely in parallel, and between these two spring frames 6, 7. Was connected to a tension spring 8.

(C) The seismic isolation floor frame 5 is horizontally arranged in a plane surrounded by the guide pillars 3 at the four corners so as to be vertically movable in parallel.

D) A rotary shaft 9a is erected at the upper end between the two guide posts 3, 3 located on the destination side of the movement in which the movable spring frame 7 extends the spring 8, and at least four rotary shafts 9 are mounted on the rotary shaft 9a. The four guides 10a of the rotary shaft 9a are at least once wound around the respective guide wheels 10a of the rotary shaft 9a. Was.

E) Two connecting members 13b of the four connecting members 13a, 13a
Is U-turned right below and fastened to the seismic isolated floor frame 5 and the remaining two connecting bodies 13a are the guides installed at the upper end between the two guide posts 3,3 located on the opposite side Wrap around car 12,
Furthermore, they are guided directly below and fastened to the seismic isolation floor frame 5.

Action The guide wheels 10a having the common rotation shaft 9a all rotate in the same direction at the same speed. So these guide cars
The connecting bodies 13a and 13b wound around 10a also move at the same speed in the same direction. Therefore, the seismic isolation floor frame 5 supported by fixing one end of these connecting bodies 13a and 13b always translates vertically (moves up and down) while maintaining the initially adjusted horizontal posture.
And there is no risk of locking (No. 1,5
Figure).

In addition, since only one movable spring frame 7 moves and expands and contracts a large number of springs 8 connected thereto, the movement of the movable spring frame 7 and the expansion and contraction operation of each spring 8 are always uniformed, and the springs 8 are not moved. Locking does not occur on the floor frame 5.

When vertical acceleration (vertical vibration) acts on the seismic isolation floor frame 5 and OA equipment placed on it, and the seismic isolation floor frame 5 moves in the vertical direction, this movement is caused by the joints 13a and 13b. The movable spring frame 7 is immediately transmitted to the movable spring frame 7 through the horizontal guide frame 2 and is moved in the horizontal direction along the horizontal guide frame 2.
Are connected to each other and are extended in the horizontal direction. Due to the resistance of the spring action, the vibration cycle is lengthened and the seismic isolation effect is achieved.

Embodiment Next, the illustrated embodiment of the present invention will be described.

The frame (frame) 1 of the vertical seismic isolation device shown in FIGS. 1 to 3 is similar to a form in which a desk without sleeves is inverted.
That is, guide pillars 3 made of a channel-shaped steel hollow structural material stand upright at the four corners of the rectangular plane (second shape).
Figure). Each guide column 3 is arranged so that the groove faces inward, and is bolted or welded to both ends of two angle steel-shaped horizontal guide frames 2, 2 which are arranged to face each other in parallel in the horizontal direction. They are rigidly joined by means. Side guide frame 2
Is arranged such that the angle steel members face inward, and the hollow portions of the guide column 3 and the lateral guide frame 2 are arranged in series (FIG. 5). The upper and lower two portions of two guide columns 3, 3 adjacent to the horizontal guide frame 2 in a direction perpendicular to the horizontal guide frame 2 are rigidly joined by flat steel (tie material or reinforcing material) 4, so that the machine base 1 having a rigid structure is formed. (Figs. 1 and 4).

The seismic isolation floor frame 5 is horizontally arranged in a plane surrounded by the above-described four corner guide pillars 3 and is erected so as to move vertically.

As shown in FIG. 3, between the two horizontal steel guide rails 2, 2 facing inward facing the angle steel, the guide pillars 3, 3 on both sides are located at a position near the left end. A fixed spring frame 6 whose both ends are fixed by means of welding or the like is provided, and a movable spring 7 that moves freely is mounted on the right side so as to be freely movable in parallel. Between these fixed spring frame 6 and movable spring frame 7,
Both ends of several tension coil springs 8 are connected.
The spring constant and the number of the coil springs 8 are adjusted according to the magnitude of the response acceleration.

On the other hand, rotating shafts 9a and 9b are respectively provided between upper end portions and lower portions of the two guide posts 3, 3 which are located on the destination side of the movement in which the movable spring frame 7 extends the coil spring 8, and each of the rotating shafts Four guide sprockets 10a and 10b, each serving as a guide wheel, are mounted on each of 9a and 9b so as to rotate integrally. One end of each of the chains 13a, 13b, which are four connected bodies wound around the guide sprockets 10a, 10b in order, is fixed to the movable spring frame 7, respectively.

Two of the four chains (13b, 13b) are U-turned immediately downward from the guide sprocket 10a at the upper end of the guide column 3, and are directly turned to the two right-hand sides of the seismic isolation floor frame 5 in the figure. It is fixed in the corner. The remaining two chains (13a, 13a) are arranged at the upper end of the guide column 3 located on the opposite side (left side in the figure) from the guide sprocket 10a at the upper end of the same guide column 3.
(FIG. 1), and after that, it is further guided directly downward, and is fixed to the two left corners of the base-isolated floor frame 5 in the figure. Thus, the seismically isolated floor frame 5 has four chains 13
It is suspended and supported by a and 13b so that it can move up and down in a horizontal posture. 2 located at the upper end of the guide support 3 on the left side in the figure
Each of the guide sprockets 12, 12 is attached to a rotating shaft 11 rotatably mounted between the guide posts 3, 3, so as to rotate integrally therewith. Also, four guide sprockets 10a and 12 installed at the upper ends of the guide posts 3 at the four corners.
Are arranged corresponding to the suspension support at the four corners of the base-isolated floor frame 5 (FIG. 2).

Therefore, the guide sprockets 10a, 10b, 12 attached to the respective rotating shafts 9a, 9b, 11 rotate in the same direction at the same speed, respectively, and the respective guide sprockets 10a, 10b, 1
Since all four chains 13a and 13b wound around 2 also move in the same direction at the same speed, the seismic isolation floor frame slab 5 always moves up and down in parallel with the initially adjusted horizontal posture. Therefore, even if the position of the center of gravity of the loaded article is slightly deviated, the seismic isolation floor frame 5 does not tilt or cause locking.

As described above, the gravitational acceleration of vertical vibration due to an earthquake or the like acts on the seismic isolation floor frame 5 and a load such as office automation equipment placed thereon, and the seismic isolation floor frame 5 When the descent starts, the descent is immediately transmitted via the chains 13a and 13b as a movement for moving the movable spring frame 7 rightward in the drawing. Four chains 13a, 13 fixed to the four corners of the base-isolated floor frame 5 to suspend and support the same.
b move only in the same direction at the same speed. Therefore, the movable spring frame 7 suspended and supported by each of the chains 13a and 13b always moves in parallel, and the tension coil springs 8 connected between the two are evenly pulled. The vibration period of the floor frame slab 7 is effectively lengthened and the seismic isolation effect is achieved.

Thus, after the gravitational acceleration of the seismic isolation floor frame 5 and the equipment placed thereon and the acting force of the coil spring 8 have reached a balance, the seismic isolation floor frame 6 performs a restoring operation by the tensile force of the coil spring 8. Start.

This vertical seismic isolation device is usually used on the floor of a building, but it is also suitable for use on a floor with floor isolation devices installed. Can be very well protected from damage.

Advantageous Effects of the Present Invention As described in detail in connection with the embodiments above, the vertical seismic isolation device according to the present invention is such that the vertical movement of the seismic isolation floor frame slab 5 is always smooth while maintaining the horizontal posture. OA equipment and the like on the seismic isolation floor frame 5 are effectively protected from vertical vibrations caused by the earthquake input because there is no risk of tilting or rocking.

[Brief description of the drawings]

1 to 3 are a plan view, a front view and a side view of the vertical seismic isolation device according to the present invention, and FIG.
FIG. 4 is a plan view taken along line IV. FIG. 5 is an enlarged detailed view of a guide column and a lateral guide frame, and FIGS. 6 and 7 are a front view and a plan view showing a conventional vertical seismic isolation device. 3 ... guide column, 2 ... horizontal guide frame 7 ... movable spring frame, 8 ... spring 6 ... fixed spring frame, 5 ... seismic isolation floor frame version 10a, 12 ... guide wheels 13a, 13b ... Connecting body 9a, 9b, 11 ... Rotary shaft

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Nobuo Yamaguchi 8-21-1, Ginza, Chuo-ku, Tokyo Inside Takenaka Corporation Tokyo Main Store (72) Inventor Hiroshi Hayami 2-5-1 Minamisuna, Koto-ku, Tokyo No. Takenaka Corporation Technical Research Institute Co., Ltd. (72) Satoru Aizawa 2-5-14 Minamisuna, Koto-ku, Tokyo 2-7-14 Inside Takenaka Corporation Technical Research Center (72) Inventor Ikuo Shimoda 1-3-3 Shiba-Daimon, Minato-ku, Tokyo No. 2 Oiles Industry Co., Ltd. (72) Inventor Shuichi Nagata 1-3-2 Shiba-Daimon, Minato-ku, Tokyo Oiles Industry Co., Ltd. (56) References Real Opening Sho 62-1888641 (JP, U) ( 58) Field surveyed (Int.Cl. ⁶ , DB name) E04F 15/18 601 F16F 15/02

Claims (1)

(57) [Claims] 1. A) hollow guide posts upright at four corner positions are respectively joined to both ends of two hollow horizontal guide frames arranged to face each other in parallel in the horizontal direction. B) One spring frame is fixed between the two lateral guide frames, and the other spring frame is erected so as to be able to move in parallel. A tension spring is provided between the two spring frames. C) a seismic isolation floor frame is horizontally arranged in a plane surrounded by the guide pillars at the four corners so as to be able to move up and down in parallel, and d) the movable spring frame includes a spring. A rotation shaft is provided at an upper end portion between two guide posts located on the destination side of the movement to be extended, and at least four guide wheels are mounted on this rotation shaft so as to rotate integrally, and one end is formed as described above. The four connected bodies fixed to the movable spring frame are temporarily moved to each guide wheel of the rotary shaft. E) Two of the four connected bodies are U-turned immediately below and fastened to the seismic isolation floor frame, and the other two connected bodies are opposite. Characterized in that it is wound around a guide wheel installed at the upper end between two guide posts located on the side, and is further guided downward and fixed to a seismic isolation floor frame. Quake device.