JPH0214506B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a vibration-isolating floor structure in which a floor slab is structurally supported around the periphery by walls and beams, such as a floor slab in an apartment complex, and a floor plate is supported on top of the floor slab through a vibration-isolating material. The purpose is to greatly improve the effect of improving floor impact noise through simple improvements. In the past, as shown in FIGS. 3 and 4, for example, a large number of vibration isolators 7' arranged in a grid pattern with equal spacing all had the same spring constant. 2 is a concrete wall, 3 is a beam, 4 is a closet, and 8 is a floorboard. In this case, it is difficult to say that floor impact noise has been sufficiently improved. The reason for this is that the impact force tends to be applied evenly to the center and the periphery of the floor slab, whereas the unit floor slab is weaker in the center and stronger in the periphery supported by walls and beams ( This is because there is an imbalance in that the impact sound is lower in the peripheral areas. Therefore, it is necessary to install vibration isolating material throughout the area between the floorboards and the floor slab, and to form the vibration isolating material around the floor from a cushioning material with a higher density than that in the center (for example, (Japanese Utility Model Application Publication No. 54-84828), or scattering vibration-proofing material that is harder than the vibration-proofing material spread over the entire floor slab only around the floor (Japanese Utility Model Publication No. 55-84828)
126437) is being considered to improve the suppression effect against floor impact noise. However, both methods require the preparation of vibration isolating materials made of different materials, which is not only uneconomical but also requires time and effort to manage the materials. In view of the above points, an object of the present invention is to enable inexpensive construction while maintaining a high floor impact noise suppression effect. Therefore, the characteristic configuration of the present invention is that a large number of vibration isolators each having the same spring constant are placed in the center of the floor slab, but the apparent spring constant per unit area is smaller than that of the one located in the periphery. The reason for this is that they are arranged at different intervals to achieve the following conditions. In other words, when arranging a large number of vibration-proofing materials, you can simply change the apparent spring constant per unit area by making the spacing between them smaller toward the periphery. When the impact force is transmitted to the floor slab, more force is transmitted to the periphery of the floor slab supported by walls and beams than to the center of the floor slab, which is structurally weak, and the force is It is caught by a large number of vibration isolating materials around the area where the constant is large. As a result, it has become possible to greatly enhance the effect of suppressing floor impact noise. Furthermore, since the many vibration isolators placed on the floor slab all have the same spring constant, it is only necessary to prepare one type of vibration isolator, which makes material management easy and inexpensive construction, making it economical. I am now able to improve my Examples will be described below with reference to FIGS. 1 and 2. 1 is a floor slab with a structural concrete wall 2 around it, and is a unit whose periphery is supported by a similar concrete wall 2 and beams 3 one floor below. 4 is a closet, 5 is a window opening, and 6 is a door opening. 7 is a vibration isolating material, and the spacing of the vibration isolating materials 7 having substantially the same spring constant is changed. 8 is a floor plate, and as shown in the graph, the reaction force against the impact force P applied to the floor plate is larger toward the periphery. In other words, the apparent spring constant gradually increases as it approaches the periphery. 9 is liner. Next, the amount of improvement in transmitted sound ΔL (difference from a bare slab; unit: dB) was measured using a vibration isolating material 7 made of glass wool and covered with a thin rubber film in the pattern shown in FIG. In addition, when the vibration isolators 7 of 3.1×10 ⁴ N/m are arranged evenly at equal intervals (conventional example), the vibration isolators located along the partition wall in the closet have a spring constant higher than others. Measurements were also made using a larger one (comparative example) with a diameter of 13.1×10 ⁴ N/m. The results are shown in the table below.

[Table] In other words, it is recognized that if the present invention is applied, the amount of improvement will be greatly increased, and that increasing the spring constant at the partition portion will actually produce worse results. The vibration isolating material 7 in the case of FIG. 1 may be one in which high-density inorganic fibers (glass wool, rock wool, etc.) are covered with a thin rubber film, or one made entirely of hard rubber.

[Brief explanation of drawings]

The drawings show an embodiment of the vibration-isolating floor structure according to the present invention, in which Fig. 1 is a schematic plan view, Fig. 2 is a schematic cross-sectional view also showing a reaction force distribution graph, and Figs. 3 and 4 are examples of the conventional structure. They are a schematic plan view and a schematic cross-sectional view. 1...floor slab, 7...vibration isolating material, 8...floorboard.

Claims (1)

[Claims] 1 A vibration-proof floor structure in which a floor plate 8 is supported via vibration-proofing materials 7 on a unit floor slab 1 whose periphery is structurally supported by walls and beams, with a large number of vibration-proofing materials each having the same spring constant. The vibration materials 7 are arranged at different intervals so that the apparent spring constant per unit area of the vibration materials 7 located at the center of the floor slab 1 is smaller than that of the materials located at the periphery. Shaking bed structure.