JP3092097B2 - Damping double floor structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for reducing vertical vibration generated on a floor in a double floor (generally referred to as a free access floor) used for constructing an installation room for electronic computers, semiconductor manufacturing equipment and the like. It relates to a double floor structure.

[0002]

2. Description of the Related Art In FIG. 4, a vertical vibration is generated on the floor of a building 1 by a road traffic or a machine having a rotating mechanism at all times, and by an earthquake motion during an earthquake. Particularly, in the floor slab 2 having the long span structure, the vertical vibration shown by the broken line in FIG. 4 tends to be large.

Computers, semiconductor manufacturing equipment, and the like are usually installed on a double floor from the viewpoint of air-conditioning and the convenience of wiring and piping. Double floors called seismic isolation floors (or vibration-isolated floors) that reduce vibration on double floors have been considered.

Generally, as shown in FIG. 5, a double floor is provided with a plurality of double floor supports 4 erected on a building floor slab 3, and the double floor supports 4 are bridged between upper ends thereof. This is a structure in which the panel 5 is placed and laid, and is called a free access floor. The seismic isolation floor is a double floor as shown in FIG.
Elastic body 6 for reducing vertical vibration transmitted from floor slab 3 to double floor strut 4 between the first and second floor struts 4
A group, for example, intervening damping means such as a spring and a shock absorber.

In this case, a structure 7 such as a lattice beam is usually laid on the elastic body 6 in order to structurally stabilize the upper part of the double floor support 4 group. Further, instead of between the double floor support 4 group and the floor slab 3, an elastic body or the like for reducing transmission of vibration from the floor slab 3 is inserted between the top of the double floor support 4 group and the floor panel 5. There are also things.

[0006]

In any case, a material for reducing the transmission of vibration is inserted between the floor slab 3 and the floor panel 5 in the base-isolated floor, and the vibration generated in the floor slab 3 is reduced by the floor panel. However, the insertion of the elastic body 6 increases the double floor height, and the structure is generally complicated and expensive, such as providing a structure 7 such as a lattice beam. ing.

On the other hand, as means for reducing the vibration generated in the structure, an additional mass 10 is attached to the structure 8 via an elastic body 9 as shown in FIG. There is a method of reducing the vibration of the structure 8 itself by setting the additional mass 10 so as to substantially cancel the vibration of the structure 8 by setting the vibration so as to be substantially the same as that of the object 8, and is generally called a dynamic vibration absorber. ing.

The present invention is an application of this method to vertical vibration on a double floor. In this case, it is conceivable to install a dynamic vibration absorber on the floor slab 3 to reduce the vertical vibration of the floor slab 3 and to add a normal free access floor. However, if the dynamic vibration absorber and the free access floor are separately installed in this way, the dynamic vibration absorber may hinder the convenience of the double floor for air conditioning and wiring / piping, Use a dynamic vibration absorber to avoid floor slab 3
Although it is conceivable to hang it underneath, there is a problem that scaffolding is generally poor and maintainability is poor.

[0009] In the present invention, in order to reduce the vertical vibration generated on the double floor as easily and inexpensively as possible without reducing the convenience of the double floor, the double floor constituting the double floor is provided. It is an object of the present invention to provide a vibration damping double floor structure in which a vertical vibration damper is incorporated into a column.

[0010]

The above object can be attained by adopting the following novel characteristic constitution means of the present invention. That is, a first feature of the present invention is that a plurality of double-floor struts are erected by directly fixing the base of the double-floor struts directly on a building floor slab, and extending between the upper ends of the double-floor strut groups. In a double floor of a vertically integrated moving structure in which floor panels are placed and laid so as to be bridged, an elastic body having a vertical spring property with an additional mass attached directly to the double floor support is directly attached to the double floor support. It has a floor structure.

A second feature of the present invention is the vibration-damping double floor structure according to the first feature, wherein damping means is incorporated in parallel with the elastic body.

A third feature of the present invention is that the first or the second
A damping double floor structure using an elastic body having a damping function as the elastic body according to the above feature.

[0013]

According to the present invention, a plurality of double-floor struts 4 are erected on a building floor slab 3 as shown in FIG. Since it is a double floor with a structure in which the floor panel 5 is placed and laid so as to span over it,
By attaching an additional mass 10 to the double-floor support 4 via an elastic body 9 having a spring characteristic in the vertical direction, a dynamic vibration absorber for the floor slab 3 is formed at this portion, and the vibration is generated on the double-floor. The vertical vibration of the building floor slab 3 is reduced.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 2 is an enlarged central longitudinal section of this embodiment, and FIG.
FIG. 3 is a plan view of a portion corresponding to a line I. In the figure, 11 is a double floor support, 12 is a base portion of the double floor support 11, 13 is a cap-type floor panel receiving portion screwed to the upper end of the double floor support 11, 1
4 is a stud-bolt-type elastic body screwed into the double-floor support 11, 1
5 is a cylindrical nut type additional mass (weight).

In the vibration damping double floor, the base portion 12 of the double floor support 11 is fixed to the building floor slab 3 with bolts, adhesives, or the like, and a plurality of these are arranged at appropriate intervals, and the floor panel at the upper end of each floor panel is provided. It is constructed by bridging and laying the floor panel 5 between the receiving portions 13. Here, the elastic body 14 to which the additional mass 15 is attached is fixed to the double floor support 11. The elastic body 14 may be made of any material having a spring characteristic in the vertical direction, such as rubber or metal spring.

Further, damping means (not shown) may be incorporated in parallel with the elastic body 14 at the same time as the spring characteristics, or by adding an appropriate damping performance by using an elastic body having a damping function, the vibration damping capacity can be improved. May be increased. In this case, it is necessary to make it possible to change the attachment position of the additional mass 15 to the elastic body 14 and to adjust the range in which the elastic properties of the elastic body 14 can be exhibited (the magnitude of the spring property). is there.

In addition, it is more preferable that the mass of the additional mass 15 can be changed. Then, after the double floor is formed, the magnitude of the spring characteristic of the elastic body 14 is adjusted, and in some cases, the magnitude of the additional mass 15 is adjusted, and the vertical natural frequency of the additional mass 15 is adjusted. Is substantially equal to the vertical natural frequency of the building floor slab 3.

By forming a double floor having such a structure, the elastic body 14 and the additional mass 15 serve as a dynamic vibration absorber against vertical vibrations generated in the building floor slab 3 by the portion. Thus, the effect of reducing the vertical vibration of the floor slab 3 is obtained, and the vibration of the double floor thereon is also reduced.
Of course, it is not necessary to attach the additional mass 15 to all the columns 11 constituting the double floor, and it is sufficient to add the additional mass 15 to the column at an appropriate position on the portion to be damped.

[0019]

As described above, according to the present invention, since the double floor structure itself constitutes a dynamic vibration absorber, the vertical vibration generated on the double floor can be reduced simply and inexpensively without deteriorating the convenience of the double floor. Furthermore, there is an advantage that the vibration of the building floor slab can be reduced.

For this reason, it is useful to protect the computer and the semiconductor manufacturing equipment on the double floor from the functional obstacles caused by the vibrations caused by the surrounding road traffic, the machinery having the rotating mechanism, etc. and the vibration at the time of the earthquake, In particular, it exhibits excellent utility and usefulness, such as being extremely effective for floor slabs having a long span structure, which tends to have large vertical vibrations.

[Brief description of the drawings]

FIG. 1 is a principle diagram of the present invention.

FIG. 2 is an enlarged central longitudinal sectional view showing an embodiment of the present invention.

FIG. 3 is a plan view of a part corresponding to the line III-III in FIG. 2;

FIG. 4 is a schematic sectional view of a building.

FIG. 5 is a longitudinal sectional view of a double floor (free access floor).

FIG. 6 is a vertical sectional view of a base-isolated floor.

FIG. 7 is a schematic view of a dynamic vibration absorber.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Building 2 ... Long span structural floor slab 3 ... Floor slab 4, 11 ... Double floor support 5 ... Floor panel 6, 9, 14 ... Elastic body 7 ... Structure 8 ... Structure 10, 15 ... Additional mass 12 ... Base part 13: Floor panel receiving part

Continuation of front page (56) References JP-A-4-140362 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04F 15/024 602 E04F 15/18 601 E04H 9/02 341

Claims (3)

(57) [Claims] A plurality of double-floor struts are erected by directly fixing a base of a double-floor strut directly on a building floor slab, and a floor panel is spanned over the upper end of the double-floor strut group. Characterized in that an elastic body having a spring characteristic in a vertical direction to which an additional mass is attached is directly attached to the double-floor strut, 2. The vibration damping double floor structure according to claim 1, wherein damping means is incorporated in parallel with said elastic body. 3. The vibration damping double floor structure according to claim 1, wherein an elastic body having a damping function is used as said elastic body.