JPH05156793A - Base seat for double floor support legs - Google Patents

Abstract

PURPOSE:To secure sound-shielding and absorbing effects of double floors as well as make the construction of simple structure floors easier by a method in which many projections of a specific elastic material are provided in a given areal ratio to the bottom. CONSTITUTION:Support legs 4 are attached to five places of a double floor panel, where the legs 4 are fixed by screws through a adjuster metal to screw metals buried in a particle board. Many projections 2 composed of an elastic rubber of a hardness of 50-80, having a height of 1.0mm or more and an areal ratio of 5-50% (on the basis of the bottom side of the projection 2) are provided to the bottom. In this case, the insert hole of the leg 4 is of a two-stage structure having a larger diameter upper stage and a smaller diameter lower stage, making the coming-out of the leg impossible. Also, even the top portion is provided with recessions 3 to raise sound-shielding and absorbing effects of the double floor.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a pedestal for double floor support legs.

[0002]

2. Description of the Related Art Conventionally, there are two types of double-floor support legs that are integrated with a floor member, or one type in which one to four floor members are placed on one support leg. A rubber pedestal is used in the lower part of the support leg for the purpose of vibration and sound insulation. All of this rubber pedestal has a flat bottom, and its vibration and soundproofing performance is not yet satisfactory.

[0003]

[Purpose] An object of the present invention is to raise the effect of sound insulation and sound deadening of a double floor by using a pedestal of a specific structure and a specific material between a support leg and a slab.

[0004]

According to the present invention, in a pedestal for double-floor support legs, a large number of convex portions are provided on the bottom, and the ratio of the area of the convex portions to the area of the bottom is 5 to 50%, preferably 5 to 30%. Particularly preferably 5 to 20%, the height of the convex portion is 1.0 mm or more, preferably 1.5 mm or more, and the rubber hardness is 50 to 80, preferably 5 having a supporting leg insertion hole in the center of the pedestal.
The present invention relates to a pedestal for double floor support legs, which is made of an elastic body of 5 to 70.

The support leg insertion hole preferably has a two-step structure in which the diameter of the upper step is large and the diameter of the lower step is small. If the structure is such that the support legs with a large diameter reach the lower part of the pedestal in one step, the cushioning effect, sound insulation, and sound deadening effect will be reduced, and if the insertion part is shallow, the support legs will easily come off. With the two-stage structure, the cushioning effect, sound insulation, and sound deadening effect are not lost, and the structure is hard to come off. Moreover, it is preferable to form not only the bottom portion but also the top portion. As a result, it is possible to exert further sound insulation and sound deadening effects.

When the area of the convex portion at the bottom is out of the range of 5 to 50%, the effect of sound insulation and silencing due to the provision of the unevenness is considerably reduced. The optimum ratio is determined in consideration of the rubber hardness. The rubber hardness is measured by a spring type hardness test A type of JIS K-6386. If the rubber hardness is 50 or less, it is too soft, and if it is 80 or more, it is too hard, and neither of them can sufficiently exert the effect of unevenness. However, the preferable range is 55 to 70.

The shape of the pedestal may be a cylinder, a prism, or any other shape. Further, the shape of the bottom convex portion may be a cylinder, a prism, or any other shape, for example, the shape of the top portion as in the first embodiment. The uneven shape of the top is essentially the same as the bottom.

[0008]

【Example】

Example 1 A pedestal of this example is shown in FIG. A is a top plan view, B is a bottom plan view, and C is a side view. The pedestal 1 is made of a carbon black compound rubber material having a rubber hardness Hs = 60,
The height of the bottom convex portion 2 is 2 mm, the depth of the top concave portion 3 is 2 mm, the height of the entire pedestal is 32 mm, the bottom diameter is 40 mm, and the top diameter is 30 m.
m, the diameter of the upper step of the support leg insertion hole 4 is 13 mm, the depth is 10 mm, the diameter of the lower step is 6 mm, and the depth is 10 mm.
And The relationship between the double floor plate 11, the support leg 5 and the pedestal 1 is as shown in FIG. 2, and the distance between the bottom surface of the double floor plate 11 and the floor slab was adjusted to 150 mm. Double floorboard used 1
1, the lower layer 8 is a particle board having a thickness of 20 mm, the intermediate layer 9 is a waste plywood having a thickness of 12 mm, and the upper layer 10 is a thickness of 12 m.
As shown in FIG. 3, the support leg 5 and the pedestal 1 were attached to each double floor board using a wood floor of m. The support leg 5 was fixed by screwing it into a screw fitting embedded in the particle board via an adjuster fitting 6. The tip of the base 1 is inserted into the base 1 via a metal fitting 7. FIG. 3 is a diagram showing a state in which the support legs are attached to the back surface of the double floor plate, and the dimensions thereof are shown in units of mm.
As shown in FIGS. 2 and 3, a support leg and a pedestal are attached to the pedestal of the present embodiment, and in accordance with JISA-1418 “Measuring method of floor impact sound level at site of building”, the Japan Building Research Institute I did a test. Temperature and humidity during test Sound source side 30.0 ° C, 53% Sound receiving side 24.5 ° C, 51% Test location 5-8-1 Fujishirodai, Suita City, Osaka Prefecture
No. Japan Building Research Institute Floor impact sound level improvement amount in laboratory △ L = L. -Ln (dB) L. : RC floor slab floor impact sound level (dB) Ln: RC slab floor impact sound level (dB) test results

[Table 1] As a result, it can be seen that the double floor of this example cleared the L-50 grade for light impact and the L-55 grade for heavy impact.

Example 2 A pedestal of the present invention having the same structure as that of Example 1 and having unevenness on the upper and lower sides was compared with a control pedestal having the same size but the upper and lower sides being flat. The comparative test method was in accordance with JIS A-1418. The results are shown in FIGS. 5 and 6. According to FIG. 5 showing the case of the pedestal of the present invention, in the case of lightweight impact (solid line), L-5
It goes below the line of 0 (fine dotted line), L-50
It indicates that you will pass. In the case of heavy impact (dashed line), the line is below the line L-55 (dotted line), indicating that the product passes L-55. On the other hand, in the case of the control pedestal of FIG. 6, as shown in FIG. 6, even in the case of a light impact (solid line), the line of L-50 (rough dotted line)
It shows that only L-55 can pass, and in the case of weight impact (dotted line), it exceeds the line (long dotted line) of L-55 and passes L-55. No, it shows that the level is L-60. The results are shown in Table 2.

[Table 2]

[0010]

[Effect] The pedestal of the present invention has a simple structure, and the construction using the pedestal is simple, and as a result, it is possible to achieve a considerably effective sound insulation and sound deadening effect.

[Brief description of drawings]

1A and 1B show a pedestal of an embodiment of the present invention, in which A is a top plan view thereof, B is a bottom plan view thereof, and C is a side view thereof.

FIG. 2 is a cross-sectional view of a part of a double floor structure using the pedestal of the embodiment of the present invention.

FIG. 3 shows a mounting location of a support leg on a double floor plate and a dimension (mm) of the double floor plate used in an example of the present invention.

FIG. 4 is a graph showing the floor impact sound level of the embodiment of the present invention, in which the horizontal axis represents the octave band center frequency (Hz) and the vertical axis represents the floor impact sound level (dB).

FIG. 5 is a graph showing a floor impact sound level test result of the pedestal of the embodiment of the present invention. The horizontal axis represents the octave band center frequency (Hz), and the vertical axis represents the floor impact sound level (dB). This point is the same in FIG. 6.

FIG. 6 is a graph showing a floor impact sound level test result of a control pedestal.

[Explanation of symbols]

 1 pedestal 2 convex portion at the bottom of the pedestal 3 concave portion at the top of the pedestal 4 support leg insertion hole 5 support leg 6 adjuster metal fitting 7 receiving metal fitting 8 lower layer of double floor plate 9 middle layer of double floor plate 10 upper layer of double floor plate 11 double floor plate

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Masaaki Morita 1-25-1 Miyagi, Adachi-ku, Tokyo Tajima Corporation

Claims (3)

[Claims] 1. The pedestal for a double floor supporting leg according to claim 1, wherein the pedestal for the double floor supporting leg is made of an elastic body having a large number of convex portions on the bottom. 2. A pedestal for double-floor support legs is provided with a large number of convex portions on the bottom, and the ratio of the area of the convex portions to the area of the bottom is 5 to 50%, and the height of the convex portions is 1. Rubber hardness of 0 mm or more and having a support leg insertion hole in the center of the pedestal 5
The pedestal for a double floor supporting leg according to claim 1, wherein the pedestal for a double floor supporting leg is made of an elastic body of 0 to 80. 3. The support leg insertion hole has a two-step structure in which a diameter of an upper step portion is large and a diameter of a lower step portion is small.
Alternatively, the pedestal for a double floor supporting leg described in 2.