Unit panel and vibration-isolating floor structure

Abstract

To provide a vibration isolation floor structure that can be made into a simple structure by applying a unit panel suitable for low flooring and improving floor impact noise isolation.SOLUTION: A vibration isolation floor structure 10 to solve the above problem employs a unit panel 18 and has a joist 16 and vibration isolating material 14 under the joist 16, the unit panel 18 having a thin-walled portion 18c with a concave back surface, the thin-walled portion 18c being wide enough to allow the insertion and contact of the upper part of the joist 16 on a floor slab 12 and disposed in accordance with the spacing between the joists 16 arranged at predetermined intervals.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to the structure of a vibration-isolation floor, and particularly relates to a unit panel suitable for achieving a lower floor while ensuring sound insulation performance, and a vibration-isolation floor structure using this unit panel.

Background Art

[0002] Among so-called double floors, the vibration-isolation floating floor is generally a wet type with high vibration-isolation performance, and it is not suitable for renovation and conversion because water is used during concrete placement. On the other hand, a dry floating floor having a configuration in which joists are supported via support legs and panel members are arranged on the upper part of the joists, as disclosed in Patent Document 1 and Patent Document 2, has a drawback that the floor height becomes high because boards constituting the panel members are laminated in addition to the support legs.

[0003] Furthermore, a double floor structure aiming to improve constructability, vibration isolation, and sound insulation performance has also been proposed, such as that disclosed in Patent Document 3. The double floor structure disclosed in Patent Document 3 arranges a vibration isolator at the lower part of a column as a support leg, and screws the column to a bracket fixed to a connecting member arranged at the lower part of the floor base material to facilitate height adjustment of the panel member, and suppresses the transmission of vibration and impact sound to the floor slab. In addition, the panel member increases the rigidity of the entire panel member by arranging an intermediate laying material having higher rigidity and a larger specific gravity than the floor base material on the upper part of the floor base material, and attempts to make the entire panel member thinner.

[0004] However, in the double floor structure having a configuration as disclosed in Patent Document 3, since a connecting member for fixing a bracket to which the column is screwed is arranged at the lower part of the floor base material and a vibration isolator is arranged at the lower part of the column, it is difficult to achieve a lower floor compared to the conventional double floor structure, and there is a problem that the number of constituent members increases.

Prior Art Documents

Patent Documents

[0005] [Patent Document 1] Japanese Patent Publication No. 2001-279912 [Patent Document 2] Japanese Patent Publication No. 2005-290708 [Patent Document 3] Patent No. 6571343 [Overview of the project] [Problems that the invention aims to solve]

[0006] Therefore, the present invention aims to solve the above problems and provide a unit panel suitable for low-floor construction, and a vibration-damping floor structure that can be easily constructed by applying this unit panel to improve floor impact sound insulation. [Means for solving the problem]

[0007] The unit panel according to the present invention for achieving the above objective is a unit panel used in a joist floor, wherein the unit panel has a thin-walled portion formed in a concave shape on its back surface, the thin-walled portion has a width that allows the upper part of the joist arranged on the floor slab to intercept and abut against it, and is arranged in accordance with the spacing of the joists which are arranged at predetermined intervals.

[0008] Furthermore, a unit panel having the above-described characteristics is constructed by joining a front plate to one or more back plates, and the thin-walled portion is preferably constructed by cutting a notch in the back plate. With these characteristics, the thin-walled portion can be formed more easily than by shaving the thickness of a single plate.

[0009] Furthermore, in a unit panel having the above-described characteristics, it is desirable that the front panel and / or back panel be made of particleboard. Having these characteristics allows for greater flexibility in the thickness and size of the unit panel, as well as improved workability.

[0010] Furthermore, the vibration-damping floor structure according to the present invention for achieving the above objective is characterized by comprising a unit panel having any of the above features, a joist placed on the lower surface of the unit panel, and a vibration-damping material placed below the joist.

[0011] Furthermore, in a vibration-damping floor structure having the above-described features, it is desirable that a recess capable of accommodating at least a portion of the vibration-damping material is formed on the underside of the joist. Having such features makes it possible to lower the height from the surface of the floor slab to the surface of the unit panel compared to when vibration-damping material is placed under a typical joist. [Effects of the Invention]

[0012] The unit panel having the above-described characteristics, and the vibration-damping floor structure to which this unit panel is applied, make it possible to improve the sound insulation performance of the floor impact while also lowering the height of the double floor and simplifying the structure. [Brief explanation of the drawing]

[0013] [Figure 1] This is a cross-sectional view showing the configuration of a vibration-isolating floor structure according to an embodiment. [Figure 2] This is an exploded cross-sectional view illustrating the details of the vibration-isolating floor structure according to the embodiment. [Figure 3] This diagram compares a conventional vibration-isolating floor structure using unit panels and joists with the vibration-isolating floor structure according to the embodiment. [Figure 4] This diagram shows the configuration of a vibration-isolating floor structure when vibration-isolating material is placed on the joists of a conventional structure, and the unit panel according to the embodiment is placed on top of the joists. [Figure 5] This figure shows an example of a test device for investigating the transmission of floor impact sound to the area below. [Figure 6] This graph illustrates the effect of reducing floor impact noise. [Figure 7] This figure shows an example of a test apparatus for investigating the transmission of impact sound, equipped with irregularly shaped test chambers 1 and 2. [Figure 8]This is a graph for comparing and explaining the floor impact sound reduction effect of the anti-vibration floor structure according to the embodiment and the dry double floor structure according to Citation 3.

Embodiment for Implementing the Invention

[0014] Hereinafter, embodiments of the unit panel and the anti-vibration floor structure according to the present invention will be described in detail with reference to the drawings. The following embodiments are a part of preferred forms for implementing the present invention, and as long as the same effects can be obtained even if a part of the configuration is changed, it can be regarded as a part of the present invention.

[0015] [Configuration] First, referring to FIGS. 1 and 2, after explaining the basic structure of the anti-vibration floor structure 10 according to the present embodiment, the details of the characteristic structure will be described. The anti-vibration floor structure 10 according to the present embodiment is basically composed of joists 16 arranged at predetermined intervals on a floor slab 12 that constitutes a floor of an apartment building, hotel, office, etc., and a unit panel 18 arranged on the upper part of the joists 16.

[0016] The joist 16 according to the present embodiment has a recess 16a formed on the lower surface, that is, the surface facing the floor slab 12. Further, an anti-vibration material 14 is arranged between the floor slab 12 and the joist 16. Examples of the anti-vibration material 14 include leaf springs, special foamed urethane, rubber, etc., but it is not limited to these as long as anti-vibration characteristics can be obtained. Also, by accommodating a part of the anti-vibration material 14 in the recess 16a formed on the lower surface of the joist 16, it becomes possible to suppress the height of the joist 16 having an anti-vibration effect (the height from the floor slab 12 to the upper surface of the joist 16). Here, the depth of the recess 16a may be determined according to the structure and height of the anti-vibration material 14, and it is sufficient that a gap for exerting an anti-vibration effect is formed between the floor slab 12 and the lower surface of the joist 16 after accommodating a part of the anti-vibration material 14. The recess 16a may be provided continuously along the longitudinal direction of the joist 16 (the joist 16 shown in FIGS. 1 and 2 shows a cross-section in a direction intersecting the longitudinal direction), but it may also be provided in spots according to the interval at which the anti-vibration material 14 is arranged.

[0017] The unit panel 18 is configured to have a predetermined thickness (for example, about 40 mm) in order to ensure strength, sound insulation, etc. In the present embodiment, a thin portion 18c that recesses the back surface of the unit panel 18 is provided. The thin portion 18c is provided in accordance with the arrangement interval of the joists 16 arranged on the floor slab 12, and has a width that allows at least the upper portion of the joist 16 to intervene and the upper portion to abut against the ceiling portion of the thin portion 18c. In such a configuration, the strength of the thin portion 18c (the strength in the bending direction with respect to the surface) is borne by the joist 16. Therefore, it is possible to secure a predetermined strength for the entire unit panel 18 while suppressing the height from the floor slab 12 to the surface of the unit panel 18.

[0018] Further, in the present embodiment, the unit panel 18 is configured by laminating (joining) a plurality of plate materials. Specifically, it is configured by joining a front plate 18a and one or more back plates 18b (in the examples shown in FIGS. 1 and 2, the back plate 18b is one), and the thin portion 18c is configured by cutting out the back plate 18b. In the present embodiment, at least a part of the plate materials constituting the front plate 18a and the back plate 18b is made of a particle board. By using a particle board as the plate material, the degree of freedom in selecting the thickness and size increases, and the workability can be improved. In addition, since it can be configured simply by joining a plurality of (two in the examples shown in FIGS. 1 and 2) particle boards, the configuration of the unit panel 18 can be made simple.

[0019] Note that, generally, a surface layer material 20 such as flooring is arranged on the surface of the unit panel 18, that is, the surface of the front plate 18a. However, when the front plate 18a is made of OSB (Oriented Strand Boad) or a decorative particle board, there is no need to arrange the surface layer material 20, and the floor height of the anti-vibration floor structure 10 constituting the double floor can be further suppressed.

[0020] [Function and Effect] The vibration-damping floor structure 10 with the above configuration (structure (C) in Figure 3) can achieve a floor height reduction of h1 compared to a conventional vibration-damping floor structure in which a unit panel 28 (in the example shown in Figure 3, a configuration of two layers of particle board) and a conventional joist 26 are stacked and a vibration-damping material 14 is placed below them (structure (A) in Figure 3). Furthermore, it can achieve a floor height reduction of h2 compared to a conventional structure combining a unit panel 28, a joist 16 with a recess 16a, and a vibration-damping material 14 (structure (B) in Figure 3). As shown in Figure 4, even with a vibration-damping floor structure in which a unit panel 18 according to the embodiment is placed on top of a stacked arrangement of conventional joists 26 and vibration-damping material 14, a floor height reduction can be achieved compared to the conventional structure (structure shown in Figure 3(A)).

[0021] Furthermore, when the vibration-isolating floor structure 10 according to the embodiment was subjected to a test to detect impact sound resonating to the floor below using a test device 30 as shown in Figure 5, the results shown in Figure 6 were obtained. The vertical axis of the graph in Figure 6 represents the reduction in floor impact sound level after vibration-isolating floor construction compared to the structural test results before vibration-isolating floor construction (dB), and the horizontal axis represents the center frequency of the octave band of the impact sound (Hz). Referring to Figure 6, the reduction in the 63Hz band, which is the frequency used to determine the heavy floor impact sound level grade, is +4dB. Considering that a typical dry double floor shows a negative value in the 63Hz band, a high vibration isolation effect is obtained despite it being a low-floor type. In this test apparatus 30, structural columns 36 are positioned on the foundation 32 via vibration-damping materials 34, and floor slabs 38 and 40 constituting the floor are positioned vertically between these structural columns 36. In the area corresponding to the floor below, structures such as walls 42 are placed, and microphones 44 for detecting impact sounds and vibration pickup means 46 are installed. Furthermore, various vibration-damping floor structures are placed on the floor slab 40, which corresponds to the upper floor, and lightweight impact sources 48 and heavy impact sources 50 are placed therein.

[0022] Next, the vibration-isolating floor structure 10 according to the embodiment was subjected to a test using the test apparatus 31 shown in Figure 7 to detect impact noise resonating to the floor below the vibration-isolating floor (test room 2 in Figure 7) relative to a CLT (Cross Laminated Timber) floor structure, and the results shown in Figure 8 were obtained. Here, the dry double floor structure disclosed in Patent Document 3 was also tested under the same conditions.

[0023] In the graph shown in Figure 8, the vertical axis scale represents the reduction in floor impact sound level after vibration-isolating floor installation compared to the CLT test results before vibration-isolating floor installation (dB), and the horizontal axis scale represents the center frequency of the octave band of the impact sound (Hz).

[0024] Referring to Figure 8, it can be seen that the vibration-damping floor structure 10 according to this embodiment can achieve a significant reduction in noise compared to a CLT structural floor across the entire frequency band from 63 Hz to 4000 Hz. Furthermore, it can be seen that it can achieve a noise reduction of equal or greater magnitude compared to a dry double floor structure such as the one disclosed in Patent Document 3, and when the center frequency band is 125 Hz or higher, it can achieve a greater reduction in noise compared to the dry double floor structure disclosed in Patent Document 3. Here, the test apparatus 31 consists of irregularly shaped test chambers 1 and 2 made of concrete walls, floors, and ceilings, with an opening provided between the two test chambers for installing the test specimen. After constructing the CLT floor structure in the opening to separate test chambers 1 and 2, and installing a vibration-damping floor on the CLT floor structure, the performance of various floor structures can be measured by placing a lightweight impact source 48, a heavy impact source 50, and a microphone 44 in test chamber 2.

[0025] Therefore, according to the vibration-damping floor structure 10 of this embodiment, the unit panel 18 can be made into a simple structure, and the height of the double floor can be reduced. Furthermore, compared to conventional methods, the transmission of impact sound to the floor below can be significantly suppressed, resulting in quieter operation (improved floor impact sound insulation). [Explanation of symbols]

[0027] 10... Vibration-isolating floor structure, 12... Floor slab, 14... Vibration-isolating material, 16... Joist, 16a... Recess, 18... Unit panel, 18a... Front plate, 18b... Back plate, 18c... Thin-walled section, 20... Surface material, 26... Joist, 28... Unit panel, 30, 31... Test apparatus, 32... Foundation, 34... Vibration-isolating material, 36... Structural column, 38, 40... Floor slab, 42... Wall, 44... Microphone, 46... Vibration pickup means, 48... Lightweight impact source, 50... Heavy impact source.

Claims

1. A unit panel used in a joist floor, The aforementioned unit panel consists of a front panel that abuts against the upper part of the joists placed on the floor slab, and one or more back panels that are joined to the back side of the front panel. The front panel and the back panel are made of particleboard. The portion of the front panel that contacts the upper part of the joist is a thin-walled portion of the unit panel, formed by cutting out a part of the back panel. The thin-walled portion is provided in accordance with the spacing of joists arranged at predetermined intervals, and is a unit panel characterized by this configuration.

2. The unit panel according to Claim 1, A joist positioned on the lower surface of the unit panel, A vibration-damping floor structure characterized by comprising a vibration-damping material placed at the lower part of the joist.

3. The vibration-damping floor structure according to claim 2, characterized in that a recess capable of accommodating at least a portion of the vibration-damping material is formed on the lower surface of the joist.

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