JPH03169973A - Vibration proof double floor and construction method thereof - Google Patents

Abstract

PURPOSE:To make it possible to place a floor panel horizontally by easy construction by forming frames on sliding devices provided on a floor slab, and bearing the floor panel on he frames through bearing legs capable of controlling height. CONSTITUTION:A plurality of sliding devices 1 consisting of teflon 2 and 2, stainless steel plates 3 and 3, etc., are placed on a floor slab at specific intervals. After that, unit frames 5... are successively provided horizontally on the sliding devices 1, and the unit frames 5... are respectively coupled with each other in a state to hold them horizontally to form a frame 4. Then, bearing legs 6 and 6 capable of controlling height are erected on the frame 4 at specific intervals, and the heights of the top ends of the bearing legs 6 and 6 are so controlled that they have the same height. A floor panel 7 is provided on the bearing legs 6 and 6.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a seismic isolation double floor used in computer rooms, etc., which has a seismic isolation function using springs, dampers, etc., and a method for constructing the same. It is.

[Conventional technology]

BACKGROUND ART Conventionally, with regard to double floors such as raised floors, there have been known ones in which the double floor part and the building frame are connected with springs, dampers, etc., and the floor part has a seismic isolation function.

Fig. 18 shows an example of such a seismically isolated double floor, in which a lattice-like frame 44 made of H-beam steel or the like that ensures the rigidity of the double floor is made of stainless steel plates 43 and Teflon 42 made of sliding slides. It is supported horizontally via a device 41, on which support legs 46 are erected, and the height of the support legs 46 is adjusted to place a floor panel 47 thereon. The frame 44 is connected to the building frame by a spring 45 or the like, and is given a predetermined natural frequency in the horizontal direction. Stainless steel plate 4 of sliding device 4L
Reference numeral 3 designates a flat plate having a size that can accommodate the amount of horizontal movement of the frame 44, on which a Teflon 42 attached to the lower surface of the frame 44 slides.

In addition, there are other seismic isolation double floors with similar functions, such as those described in Japanese Patent Publication No. 62-21946,
It is disclosed that a frame constituting the upper floor is supported by a support device having vertical and horizontal coil springs and fluid dampers.

[Problem to be solved by the invention]

Incidentally, it is generally difficult to make the upper surface of a floor slab completely flat; for example, in the case of a concrete floor slab with a span of about 15 m, unevenness of about 10 mm to 20 mm is often unavoidable. Therefore, when constructing a double floor such as a raised floor, it is common to construct the frame so that it is horizontal, such as by adjusting the height of the base plate at the frame support position with mortar.

However, it is not easy to horizontally adjust a large frame that is supported at many points, and there is a risk that parts of the frame may become unstable. In addition, the weight of the frame is too large to be handled manually, and there are limits to mechanization compared to the work inside the building after completion, which poses problems in workability.

In addition, the support legs that are installed on the frame to support the floor panel are usually height-adjustable to maintain the horizontality of the floor panel. In addition, the support legs must also be leveled, resulting in double effort and inefficiency.

\1 Furthermore, the floor panel supported by the support legs on the frame is a panel divided into, for example, about 600 mm square, and the number of panels can be adjusted depending on the width of the floor, but the frame is a single piece. Therefore, if you later want to convert part of the floor space into a warehouse, it is impossible to remove just that part, and there is a lack of flexibility for design changes, changes in use, etc.

The present invention aims to solve the above-mentioned problems in conventional seismic isolation double floors.

[Means to solve the problem]

The seismic isolation double floor of the present invention includes: (a) a frame provided on the floor slab to ensure the rigidity of the double floor; (C) A plurality of unit frames installed horizontally on the sliding device and forming a frame (6) Connection means for connecting each of the unit frames (e) Frame A height-adjustable support leg (f) installed on the support leg; a floor panel (f) installed on the support leg;

The sliding means is not particularly limited, and may include, for example, a combination of Teflon, which is a low-friction member, and a stainless steel plate with a smooth surface, or a ball bearing.

Each unit frame should be horizontal. When connecting adjacent unit frames, slight differences in level may occur due to the unevenness of the floor slab surface. For example, if bolts are used as a connection means, this can be counteracted by the play in the bolt holes, and by lengthening the bolt holes. It is also possible to use a hole or a bakahole.

As mentioned above, since there is a step difference in the unit frame, it is necessary to adjust the height with support legs and horizontally support the floor panel of the double floor. As such support legs, conventional support legs for raised floors having a height adjustment mechanism can be used as they are.

The construction procedure for the seismic isolation double floor of the present invention is as follows.

■ A plurality of sliding means are installed at predetermined intervals on the floor slab.

■ Install unit frames horizontally one after another on the sliding means.

■ With each unit frame held horizontally,
The unit frames are connected to each other by a connecting means to construct the frame.

■ Set up support legs whose height can be adjusted at predetermined intervals on the frame, and adjust the height of the support legs so that the heights of the upper ends of the support legs match.

■ Install the floor panel on the support legs.

[For production]

In the present invention, when the floor slab surface A has unevenness as shown in FIG.
Although a slight difference in level occurs at the connecting positions of the unit frames 5, horizontality is maintained at each position.

By making the unit frame 5 smaller, the difference in level will also be smaller. For example, if the unit frame 5 is made to have dimensions similar to the spacing between the support legs 6, the difference in level will be extremely small, and if it is decided to connect with bolts, the bolt hole will normally be This can be dealt with by playing around with it. Further, the bolt holes may be made into elongated holes or round holes as required.

The height of the support legs 6 is adjustable, and the difference in level between the unit frames 5 can be absorbed by adjusting the height of the support legs 6.

〔Example〕

Next, the illustrated embodiment will be described.

FIG. 1 schematically shows an embodiment of the present invention, in which sliding devices 1 made of Teflon 2 and stainless steel plates 3 having mirror-finished smooth surfaces are provided at predetermined intervals on a floor slab surface A. A frame 4 formed by connecting a large number of unit frames 5 is installed on top of it, and a height-adjustable support leg 6 is erected in the center of each frame 4, with the heights of the upper ends of the support legs 6 being made the same. A floor panel 7 forming a double floor is attached between the support legs 6.

FIGS. 2 to 4 show the construction procedure as plan views, and FIGS. 5 to 9 show details of the unit frame 5 and each part.

In this embodiment, the unit frame 5 is made of channel steel 5a assembled in a cross shape by welding or the like, as shown in FIGS. 5 to 7.
, a substantially rectangular steel plate 5b attached to the lower surface of the channel steel 5a for supplementary provisions, a joint plate 5c welded to each end of the channel steel 5a and having a bolt hole 8, and a support leg attached to the center upper surface. It consists of a device 5d. Further, a stainless steel plate 3 constituting the upper member of the sliding device 1 is attached in advance to the lower surface of the steel plate 5b.

FIG. 3 is a plan view of the state in which the frame 4 is constructed by connecting the joint plates 5c of adjacent unit frames 5 with bolts 9. Although there is a gap between each unit frame 5, the thin plate 10 You can also block it with something like In FIGS. 5 and 7, reference numeral 11 indicates a bolt hole for this purpose.

FIG. 9 shows Teflon 2 which constitutes the lower part of the sliding device 1.
This figure shows a support mechanism in which a spherical catch 12 is provided below the Teflon 2, with a steel plate or the like interposed between them. The catch 12 is for horizontally adjusting the Teflon 2,
It may be fixed after adjustment.

Figure 8 shows the installation state of the unit panel and support legs 6. Since the coefficient of friction between the Teflon 2 and the stainless steel plate 3 of the sliding device 1 is very small, the parts above the frame 4 are protected against vibration. can slide easily. Sliding devices using a combination of Teflon and stainless steel plates have been known for a long time, but conventionally there was a stainless steel plate on the bottom with a size that matched the required amount of sliding, and a relatively small Teflon plate was placed on top of it. As a result, dust easily adhered to the stainless steel plate, requiring maintenance. On the other hand, in this embodiment, since the Teflon 2 is placed below the stainless steel plate 3, dust is less likely to adhere to the stainless steel plate 3, and less maintenance is required. In addition,
As the sliding device, a device using ball bearings or the like can also be used.

In this embodiment, the support leg 6 is provided at the center of the unit frame 5, and the lower end of the support leg 6 is screwed into a block-shaped support leg attachment device 5d having a female threaded hole, and fixed with a tightening nut 13. However, the mounting structure of the support legs 6 is not particularly limited.

FIGS. 10 to 12 show examples of support leg attachment devices in which support legs are installed at locations other than the central portion of the unit frame. For example, this is necessary when the unit frame 5 has a space equivalent to a plurality of floor panels 7, or when a rectangular floor panel 7 cannot be used near a pillar position. This support leg attachment device 20 attaches the support leg body 21 to the unit frame 5.
The flange portion of the channel steel 5b is used for attachment. The lower end of the support base body 21 is fixed to the downward groove-shaped member 22 using a block 23 with a female threaded hole and a tightening nut 24, and in this state, the groove-shaped member 22 is attached to the channel steel 5b of the unit frame 5. bolt 25 moved along the line and attached to one of the flanges of channel member 22 at a predetermined position;
can be tightened, and the tip of the bolt 25 can be fixed by pressing it against the outer surface of the flange of the groove shape a5a.

13 to 16 show other embodiments, in which the channel steel 5b of the unit frame 5 was provided upward in the embodiment described above, whereas the channel steel 5b of the unit frame 35 of this embodiment is provided with a groove. The shaped steel 35a is directed downward. Also, unit frame 3
5, instead of the joint plate 5C at the end, as shown in FIGS. 15 and 16, a joint member 36 made of channel steel wider than the channel wall 35a of the unit frame and a plurality of long lengths are used. They are connected using bolts 37.

Further, for attaching the support legs, a plurality of bolt holes 38 are provided, and the support legs having a fixing plate can be attached by bolt connection.

〔Effect of the invention〕

In the seismic isolation double floor of the present invention, by installing each unit frame that makes up the frame horizontally and adjusting the height with support legs, the floor panel can be supported horizontally, and the large frame can be leveled. Compared to conventional work, it is much easier to level the structure, and since it is a unitized unit frame, it is easier to handle, greatly improving workability.

This simplifies the work because it is only necessary to level the unit frame without having to take into account the unevenness of the floor surface.

The difference in level between the unit frames is small, and height adjustment of the support legs is normally required even in conventional construction, so there is no waste in construction.

When changing architectural plans or uses, the entire unit frame can be removed, giving flexibility for changes and allowing the height of the unit frame to be lower than when using conventional large frames. , which also contributes to the reduction of building floor height.

[Brief explanation of the drawing]

Figure 1 is a vertical sectional view showing an embodiment of the present invention, Figures 2-
Fig. 4 is a plan view showing the construction procedure, Fig. 5 is a plan view showing an example of the unit panel, Fig. 6 is its front view, and Fig. 7 is a plan view showing the construction procedure.
The figure is a bottom view, Figure 8 is a vertical sectional view showing the installation state of the unit panel and support legs, Figure 9 is a vertical sectional view showing the lower part of an embodiment of the sliding device, and Figure 10 is the unit. Fig. 11 is a vertical sectional view showing the installation device for the support legs, Fig. 12 is the plan view, and Fig. 13 is the other side of the unit panel. A plan view showing the embodiment, FIG. 14 is a front view thereof, and FIG.
The figure is a side view showing an example of a method for connecting unit panels in such a case, FIG. 16 is a vertical sectional view thereof, and FIG. 17 is an exaggerated illustration of the unevenness of the floor slab surface in order to explain the function of the present invention. FIG. 18 is a schematic diagram of a conventional seismic isolation double floor structure. A... Floor slab surface, 1... Sliding device, 2... Teflon, 3... Stainless steel plate, 4... Frame, 5... Unit frame, 5
a... Channel steel, 5b... Steel plate, 5C... Joint plate,
5d...Support leg attachment device, 6...Support leg, 7...
・Floor panel, 8... Bolt hole, 9... Bolt, 10
Plate, 11 Bolt hole, 12 Seat, 13 Tightening nut, 14 Block, 20 Support leg attachment device, 21 Support leg body,
22...Groove-shaped member, 23...Block, 24...
Tightening nut, 25... Bolt, 35... Unit frame, 35a... Channel steel, 36...
...Joint member, 37...Long bolt, 38...Bolt hole No. 1 Figure 7! ko 2 -・≦ 8th Figure 7 9th. -! 2 2 (Fig. 10 Fuko 1 1 b↑ Sμ 12 Fig. 13 Fig. 15 Fig. 16 Fig. 17 Fig. 18

Claims (3)

[Claims] (1) A frame for ensuring the rigidity of the double floor, a plurality of sliding means installed at predetermined intervals on the floor slab for sliding the frame horizontally, and connecting the frame to the building frame. In a seismically isolated double floor comprising spring means installed on the frame, support legs installed on the support legs, and a floor panel installed on the support legs, the frame is installed horizontally on the plurality of sliding means. 1. A seismic isolation double floor comprising a plurality of unit frames and a connecting means for connecting the unit frames, the support leg being provided with a height adjusting means. (2) The sliding means is installed on the floor slab via a spherical seat, and includes a low-friction member whose upper surface is horizontal; and the sliding means is installed on the upper surface of the low-friction member, supports the lower surface of the frame, and 2. The seismic isolation double floor according to claim 1, comprising a smooth plate having a width sufficient to ensure the necessary movement amount of the frame. (3) A plurality of sliding means are installed on the floor slab at predetermined intervals, and unit frames are sequentially installed horizontally on the sliding means, and the unit frames are held horizontally, and the unit frames are connected to each other with each unit frame being held horizontally. By connecting them, a frame is constructed to ensure the rigidity of the double floor, and height-adjustable support legs are erected at predetermined intervals on the frame, and the support legs are supported so that the heights of the upper ends of the support legs match. After adjusting the leg height,
2. The method for constructing a seismic isolation double floor according to claim 1, further comprising installing a floor panel on the support legs.