JP4634754B2 - Dry double floor structure - Google Patents

Description

  The present invention relates to a dry double floor structure, and more specifically, the amplification of vibration generated when vibration propagates from the frame slab to the surface of the flooring material, and also suppresses amplification of heavy floor impact sound, thereby improving the living performance. The present invention relates to an improved dry double floor structure.

  A dry double floor is known as one of floor finishing structures for concrete houses. This dry double floor can be piped in the space between the frame slab and the flooring material, and is easy to cope with so-called barrier-free, so that it has been rapidly spread in recent years.

  However, it is widely known that this dry double floor amplifies the heavy floor impact sound generated in the lower floor due to the jumping and running around of the child on the upper floor, as compared with the case of the concrete slab surface. In order to suppress the amplification of the heavy floor impact sound, various countermeasures such as installing a sound absorbing material in a space between the frame slab and the floor material have been taken (for example, see Patent Document 1).

  By the way, the inventors of the present invention have confirmed by experiments that the dry double floor has a frequency range that amplifies the vibration even when the vibration is propagated from the housing slab surface to the floor surface (see FIG. 3). ). In FIG. 3, the vibration acceleration level difference (dB) indicated by the vertical axis is a value obtained by subtracting the vibration acceleration level of the generated vibration on the floor material surface from the vibration acceleration level of the generated vibration in the frame slab. Therefore, when the vibration acceleration level difference is positive, the vibration is reduced, and conversely, when the vibration acceleration level difference is negative, the vibration is amplified. According to FIG. 3, an amplification phenomenon occurs in a low frequency range. I understand that.

Amplification of vibration means amplification of solid sound, which leads to deterioration of living performance. However, attention has been paid to such a phenomenon, and a technique for reducing the phenomenon has not been proposed yet.
JP 2000-179134 A

The present invention has been made based on the technical background as described above, and achieves the following object.
The object of the present invention is to reduce the solid sound by suppressing the amplification of vibration generated when the vibration propagates from the frame slab to the surface of the flooring material. An object of the present invention is to provide a dry-type double floor structure that can reduce the amplification by suppressing the amplification.

  The vibration amplification phenomenon that occurs in the low frequency range when vibration propagates from the frame slab to the floor surface, and the heavy floor impact sound amplification phenomenon is formed between the frame slab and the floor material in the dry double floor. This is largely due to the resonance phenomenon using the air layer as a spring. The inventors of the present invention have made extensive studies to suppress such a resonance phenomenon, and as a result, installed a shock absorber on the upper surface of the frame slab or the lower surface of the flooring so that the surface shape is an uneven surface. Was found to be effective.

This invention is made on the basis of the above knowledge, and in a dry double floor structure comprising a frame slab and a floor material installed on the frame slab via support legs,
The dry double floor structure is characterized in that a buffer body having a rough surface is provided on the upper surface of the frame slab or the lower surface of the flooring.

  For example, the concavo-convex surface can be formed by configuring the buffer body with a large number of buffer blocks having different sizes and arranging the buffer blocks. Here, the difference in size means that at least the height of the buffer block is different, and the cross-sectional areas may be different. When the buffer is installed on the lower surface of the floor material, it is preferable that the mass per unit area of the buffer and the floor material is set to be sufficiently larger than that of the floor material.

  According to this invention, the buffer body installed on the upper surface of the frame slab or the lower surface of the flooring has an uneven surface. As a result, the air layer formed between the housing slab and the flooring has a non-uniform thickness, and the occurrence of a resonance phenomenon using the air layer as a spring can be suppressed. Thereby, amplification of vibration generated when vibration propagates from the frame slab to the surface of the flooring and amplification of heavy floor impact sound can be suppressed, and the living performance can be improved.

  FIG. 1 is a cross-sectional view showing an embodiment of the present invention. The dry double floor includes a concrete frame slab 1 and a floor material 2 installed on the support frame 5 via a plurality of support legs 5. As a result, air is provided between the frame slab 1 and the floor material. Layer 6 is formed. The flooring 2 is generally composed of a floor finishing material 3 such as wood flooring disposed on the front surface and a wood surface material 4 such as particle board disposed on the back surface.

  According to this invention, the buffer body 7 is installed on the upper surface of the housing slab 1. In this embodiment, the buffer body 7 is composed of a large number of buffer blocks 8 having different sizes (height and cross-sectional area in this embodiment). These buffer blocks 8 are randomly installed on the housing slab 1. As a result, when the buffer body 7 is viewed as a whole, a non-uniform uneven surface is formed on the surface thereof.

  By forming such an uneven surface, the thickness of the air layer 6 becomes non-uniform, and the occurrence of a resonance phenomenon using the air layer 6 as a spring is suppressed. Thereby, the amplification of the vibration and the amplification of the heavy floor impact sound that occur when the vibration propagates from the housing slab 1 to the surface of the floor finishing material 3 can be suppressed.

  The buffer block 8 can use, for example, polystyrene foam, and is placed on the housing slab 1 by appropriate means such as adhesion. The shape of the buffer block 8 may be various shapes such as a cone, a cylinder, a pyramid, a prism, etc., and may be a single shape or a mixture of a plurality of types. Good. The buffer block 8 may be simply placed on the housing slab 1 without being fixed by adhesion or the like.

  The buffer body 7, that is, a large number of buffer blocks 8, are not limited to being installed on the frame slab 1, but are installed on the lower surface of the flooring 2, more specifically on the lower surface of the wood surface material 4, as shown in FIG. 2. It may be. In this case, if the mass per unit area of the buffer body 7 and the flooring material 2 is set to be sufficiently larger for the buffer body 7 than the flooring material 2, the mass of the buffer body 7 is added to the mass of the flooring material 2, It acts as a so-called mass effect and is more effective in suppressing the vibration of the flooring 2. Such a mass relationship can be obtained, for example, by filling the buffer body 7 with sand, metal, or the like.

  In the above-described two embodiments, the buffer block 8 is in contact with only one of the upper surface of the housing slab 1 and the lower surface of the flooring 2, but the buffer block 8 is connected to the upper surface and floor of the housing slab 1. You may install so that both the lower surfaces of the material 2 may be contact | connected. Further, the buffer body 7 composed of the buffer block 8 may be installed over the entire surface of the frame slab 1 (or the flooring 2) or may be installed partially. It is a concept that includes

It is sectional drawing which shows embodiment of this invention. It is sectional drawing which shows another embodiment. It is a figure which shows the characteristic when a vibration propagates from the frame slab to the surface of a flooring.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Frame slab 2 Floor material 3 Floor finishing material 4 Wood surface material 5 Support leg 6 Air layer 7 Buffer body 8 Buffer block

Claims (2)

In a dry double floor structure comprising a frame slab and a flooring installed on the frame slab via support legs,
On the upper surface of the frame slab or the lower surface of the flooring, the surface shape is uneven to suppress the resonance phenomenon using the air layer as a spring by making the thickness of the air layer formed between the frame slab and the flooring uneven. Install the shock absorber on the surface,
The said buffer body consists of many buffer blocks from which a height dimension differs at least, and the said uneven surface is formed by arrange | positioning these buffer blocks, The dry-type double floor structure characterized by the above-mentioned .   When installing the buffer on the lower surface of the floor material, the mass per unit area of the buffer and the floor material is set to be sufficiently larger in the buffer than the floor material. The dry double floor structure according to claim 1.

Images