JP3326224B2 - Double floor vibration suppressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dual-purpose system for preventing a data processing device installed on a double floor of a building from being damaged when the building is vibrated by an earthquake or the like. The present invention relates to a floor vibration suppressing device.

[0002]

2. Description of the Related Art As disclosed in Japanese Patent Application Laid-Open Nos. Sho 62-170658, Hei 1-266335, and Hei 2-190580, various vibration suppressing devices for buildings have been developed. The vibration suppression devices disclosed in these publications use a so-called dynamic damper configured by supporting a weight with motion resistance by a spring, and effectively suppress resonance of a floor slab of a building. It is.

[0003]

However, in recent years, as various information processing devices and semiconductor manufacturing equipment have been widely used, double floors (generally, free access) have been used for the purpose of facilitating wiring and air conditioning.・ It is called a floor.) Double floors are constructed by laying a number of floor panels above the building floor slabs at regular intervals from the floor slabs, so that the top of the floor panels has a normal office floor and a floor floor. Below the panel, a space for use in cable wiring, air conditioning and the like is secured.

[0004] When a vibration suppressing device is installed on a floor slab having a double floor, the simplest and most effective method for installation is to install it in the space between the double floor and the floor slab. However, if the vibration suppression device occupies this space, the vibration suppression device may hinder the wiring of the cable and the air conditioning in some cases. In addition, when a double floor receives vibration such as an earthquake, due to its structure, a sufficient vibration suppression effect may not be obtained only with the vibration suppression device attached to the building body.

Accordingly, an object of the present invention is to provide a double-floor vibration suppressing device which is excellent in vibration suppressing effect of a floor slab and a double floor, has a simple structure, does not require a large installation space, and is easy to construct. To provide.

[0006]

Means for Achieving the Object In order to achieve the above object, the double floor vibration suppressing device of the present invention has the following configuration. That is, a column for a double floor standing upright on the floor slab, and a spring member arranged so as to surround the column and extendable and contractible in the axial direction of the column, and mounted on the column, and An upper holder to which an upper end of a spring member is locked, a lower holder slidably mounted on the column and connected to a lower end of the spring member, and an additional weight mounted on the lower holder And a double floor vibration suppression device.

[0007]

The vibration suppressing device having such a structure mainly exhibits a vibration suppressing function when a vertical vibration is generated in a building. The vertical vibration of the building is transmitted from the floor slab to the support for the double floor, and transmitted from this support to the double floor such as the floor panel. When the vertical vibration is transmitted to the column, the spring member expands and contracts due to the inertial force of the additional weight, and a vibration is generated that acts in a direction to suppress the vertical vibration of the floor slab. The vibration generated by the vibration suppressing device is transmitted to the floor slab and the double floor, and suppresses the vertical vibration of the floor slab and the double floor. In order for the vibration suppressor to effectively attenuate the vertical vibration of the floor slab and the double floor, the frequency of the inertial force generated by the vibration suppressor must be equal to the natural frequency of the floor slab and the double floor within a certain range. Must be equal to The frequency generated by the vibration suppressing device can be adjusted by changing one or both of the spring force of the spring member and the weight of the additional weight.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a vibration suppression device 1 of the present invention
It is a longitudinal cross-sectional view of the state installed in the support | pillar 3 of FIG. Post 3
It has a pillar main body 4 formed of a hollow cylindrical body, a support substrate 6 fixed to a floor slab 5 to support a lower end of the pillar main body 4, and a floor panel support member 7 fixed to an upper end of the pillar main body 4. As shown in FIG. 1, an upper holder 8 is fitted on the outer peripheral surface of the column 3, and is fixed to the upper portion of the column 3 by a bolt 9 and a nut 10 so as not to rotate. The upper holder 8 is integrally formed of a material such as a synthetic resin. A single spiral groove 8a is formed on the outer peripheral surface of the upper holder 8, and the upper end of the spring member 11 is slidably engaged with the groove 8a.

A pair of guide rail holders 12 and 13 are fixed to the outer peripheral surface of the column 3 with their phases shifted from each other by 180 degrees, and extend in the axial direction of the column 3 respectively. In the figure, k is a tightening belt for fixing the guide rail holders 12 and 13 to the column 3. These guide rail holders 12 and 13 are also provided with guide rails 14.
a, 14b, 15a, and 15b are fixed. The guide rails 14a, 14b, 15a, 15b are made of an aluminum alloy material, and the guide rail holders 12, 13
It is installed at an angle so that it becomes a valley at the center. These guide rails are friction type vibration damping devices 1
6 and 17 (to be described later).

The upper end of the spring member 11 is placed on the upper holder 8.
And a lower holder 18 is engaged with the lower end thereof. The lower holder 18 has a cylindrical portion 18a with which the spring member 11 is engaged, and a flange portion 18b formed at the lower end of the cylindrical portion 18a. The cylindrical portion 18a and the flange portion 18b are made of a synthetic resin material. And so on. A spiral groove 18c is formed on the outer peripheral surface of the cylindrical portion 18a, similarly to the upper holder 8, and the lower end of the spring member 11 is slidably engaged with the groove 18c. As a result, the lower holder 18 includes the support 3, the guide rail holders 12, 13, and the guide rails 14a, 14
b, 15a, and 15b are supported by the spring member 11 and movably up and down.

An additional weight 19 is placed and fixed on the upper surface of the flange portion 18b of the lower holder 18. The additional weight 19, as shown in FIG.
a, 19b, each semi-cylindrical portion 19a, 19b is formed by stacking a plurality of semicircular plate-shaped weights w and fastening them with bolts 20 and nuts 21. The semi-cylindrical portions 19a, 19b are respectively connected to the flange portions 18b of the lower holder 18 by bolts 22 and nuts 23.
Fixed to The bolt 22 is engaged with a notch 18 d formed in the flange portion 18 b of the lower holder 18 (see FIG. 2), inserted into a hole h formed in each plate-shaped weight w, and fastened by a nut 23. Then, it is fixed to the flange portion 18b.

A friction type vibration damping device 16, 17 is mounted on the lower surface of the flange portion 18b of the lower holder 18, and these vibration damping devices 16, 17 are arranged on both sides of the column 3 with the column 3 interposed therebetween. . Each vibration damping device 16, 17
A cylinder 24 formed on the flange portion 18b, a friction shoe 25 slidably mounted on the cylinder 24,
The friction shoe 25 is always moved to the corresponding guide rail 14.
It has a compression coil spring 26 for urging in the directions a, 14b, 15a, 15b, and an adjustment bolt 27 for adjusting the spring force of the compression coil spring 26.

The friction shoes 25, 25 are pressed against the sliding surfaces of the corresponding guide rails 14a, 14b, 15a, 15b by the compression coil springs 26, respectively, so that the friction shoes 25, 25 are in contact with the corresponding guide rails for vibration damping. Generates frictional force.

A support substrate 6 for supporting the lower end of the column body 4
A board plate 6a adhered to the floor slab 5 of the building with an adhesive or the like, a height adjusting bolt 6b erected on the board plate 6a, a height adjusting nut 6c screwed to the bolt 6b; And a detent screw 6d attached to the adjustment nut 6c. The height adjusting nut 6c is provided with a support surface 6e for supporting the lower end of the column main body 4, and the lower end of the column main body 4 is engaged with the support surface 6e and stands upright on the nut 6c.

As shown in FIG. 4, the column 3 is a floor slab 5
A plurality of columns 3 are arranged at predetermined intervals on the upper side and are adjacent to each other.
A stringer 29 for supporting the floor panel 28 is bridged therebetween. The stringer 29 is the support body 4
The end is supported by the floor panel support member 7 fixed to the upper end of the floor panel 28, and the lower surface of the edge of the floor panel 28 is supported by the upper surface of each stringer 29. And
Four corners of the floor panel 28 are fixed to the floor panel support member 7 from the upper surface side of the floor panel 28 by floor panel retainers 30. In FIG. 4, the vibration suppressing device 1 is covered with a protective cover 31. Protective cover 31
Is constructed by combining a pair of semi-cylindrical members 32 into a cylindrical shape as shown in the figure. By covering the outer periphery of the vibration suppressing device 1 with the protective cover 31, cables (not shown) laid between the double floor 2 and the floor slab 5 can move the movable parts such as the additional weight 19 of the vibration suppressing device 1. To prevent the operation of the vibration suppression device 1 from being damaged.

Now, as shown in FIG. 4, the vibration suppressing device 1 of the present invention does not need to be installed on all the columns 3 supporting the double floor 2, but needs to be installed on the double floor 2. What is necessary is just to install in the support | pillar 3 of a location. When the vibration suppressing device 1 vibrates in the vertical direction together with the floor slab 5 and the double floor 2, the lower holder 18 vibrates in the vertical direction due to the spring force of the spring member 11 and the inertia force of the additional weight 19. When the lower holder 18 vibrates in the vertical direction, the friction shoes 2 of the vibration dampers 16 and 17
5, 25 are guide rails 14a, 14b, 15a, 15
b moves up and down while being pressed against the sliding surface of b, and is limited by the frictional force generated between the friction shoe 25 and the guide rails 14a, 14b, 15a, 15b. In this way, the vibration suppressing device 1 having the spring force, the additional weight, and the friction force limits the generated frequency to a certain range. Vibration suppression device 1
Is the frequency at which the lower weight is
And the frequency generated by moving up and down. The constant frequency range generated by the vibration suppression device 1 is
The range of the frequency generated by all the vibration suppression devices 1 on the floor slab 5 is the natural frequency of the double floor 2, the natural frequency of the floor slab 5, and the frequency corresponding to the peak of the floor vibration spectrum at the time of the earthquake assumption. And a certain range extending before and after. By setting the vibration frequency generated by the vibration suppressing device 1 in this way, it is possible to effectively suppress the vertical vibration of the floor slab that the building has received due to an earthquake or the like.

Adjustment of the frequency generated by each vibration suppression device 1 is performed by changing the spring constant of the spring member 11 and changing the weight of the additional weight 19. The spring constant of the spring member 11 is changed by rotating the spring member 11 along the spiral grooves 8a and 18c of the upper holder 8 and the lower holder 18 to change the effective length of the spring member 11. Done by The weight of the additional weight 19 is changed by changing the number of plate-shaped weights w. The frequency of vibration generated by each vibration suppression device 1 may be changed by changing one or both of them, or may be changed by changing both of them.

[0018]

As described above, since the vibration suppressing device of the present invention is installed on a column for supporting a double floor,
It becomes possible to arrange this vibration suppressing device concentrated on the local part of the double floor. Therefore, the vibration of the double floor tuned to the floor slab can be effectively suppressed in accordance with the vibration characteristics of the floor slab.

Further, the vibration suppressing device of the present invention is installed around a column for supporting a double floor,
In addition, since the components of the apparatus are dispersedly arranged in the longitudinal direction of the column along the axis of the column, it is possible to reduce the size of the entire apparatus and not occupy a large space when installing the apparatus. Therefore, when laying a cable or the like in the space between the double floor and the floor slab, the vibration suppressing device does not interfere. In addition, since the device is small, each component is also small, and there is an effect that its manufacture and assembly are easy.

Further, since the vibration suppressing devices are distributed and installed on a plurality of columns, so to speak, each vibration suppressing device is relatively light in weight and easy to handle. Moreover, when the double floor is constructed, the vibration suppressing device is also constructed at the same time, so that there is no influence on the construction process.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a state in which a vibration suppressing device of the present invention is installed on a column having a double floor.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a perspective view showing a main part of the vibration suppressing device of the present invention.

FIG. 4 is a perspective view of a state in which a double floor is supported using the vibration suppression device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Vibration suppression device 2 ... Double floor 3 ... Strut 4 ... Strut main body 5 ... Floor slab 6 ... Support substrate 7 ... Floor panel support member 8 ... Upper holder 8a ... Spiral groove 9 ... Bolt 11 ... Spring member 14a, 14b, 15a, 15b Guide rails 16, 17 Vibration damper 18 Lower holder 18c Spiral groove 19 Additional weight 25 Friction shoe

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hitoshi Okita 1-6-1, Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Toshifumi Ninomiya 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Japan Inside Telegraph and Telephone Corporation (72) Inventor Yukio Sawabe 5-8 Akihabara, Taito-ku, Tokyo Inside NTT Building Research Institute (72) Inventor Takao Okumura 1-1-1 Uchisaiwaicho, Chiyoda-ku, Tokyo No. 1 Inside Naka Technical Research Institute Co., Ltd. (72) Tatsuo Shoji 1-1-1, Uchisaiwai-cho, Chiyoda-ku, Tokyo Inside (72) Inventor Seiji Shimura 1-1-1, Uchisaiwai-cho, Chiyoda-ku, Tokyo (56) References JP-A-62-170658 (JP, A) JP-A-2-190580 (JP, A) JP JP-A-1-266335 (JP, A) JP-A-3-153940 (JP, A) JP-B 7-6300 (JP, B2) JP-B 8-3262 (JP, B2) Patent 3092097 (JP, B2) Patent 2736532 (JP, B2) Patent 3022681 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04F 15/18 601 E04F 15/024 605 F16F 15/04

Claims (3)

(57) [Claims] 1. A strut for a double floor standing upright on a floor slab, a spring member arranged to surround the strut and expandable and contractable in the axial direction of the strut, and mounted on the strut. And an upper holder to which an upper end of the spring member is locked, a lower holder slidably mounted on the column and connected to a lower end of the spring member, and mounted on the lower holder. A double floor vibration suppression device, characterized by having an additional weight. 2. The double floor vibration suppressing device according to claim 1, wherein a protective cover is provided around the support post so as to surround the spring member and the additional weight. 3. The double floor vibration suppression device according to claim 1, wherein the double floor is constituted by a plurality of floor panels supported on the upper portions of the columns.