Wooden soundproof floor

Abstract

To provide a wooden sound insulation floor that can improve sound insulation performance of heavy floor impact noise and can use underfloor space as an equipment piping path without increasing the overall height.SOLUTION: A wooden sound insulation floor 100 comprises a wood structural floor 10 and a double floor 20. The wood structural floor is located between upper and lower floors, and the double floor is supported on the top surface of the wood structural floor. The wood structural floor comprises small beams 12, lower floor materials 14, and upper floor joists 16. The small beams are fixed to a frame 1, 3 at both ends, extend horizontally, and are positioned parallel to each other with a first spacing W1 in the width direction. The lower floor materials are fixed to the upper surface of the small beams 12 and extend horizontally. The upper floor joists are fixed to the upper surface of the lower floor materials, extend horizontally perpendicular to the small beams, and are located parallel with a second spacing W2 separating them in the width direction. The total length of the upper floor joists is set longer than bending wavelength λb of the lower floor materials. Both ends of the upper floor joists are used as equipment piping paths separated by a third spacing W3 from the ends of the frame 1, 2 or adjacent upper floor joists.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a wooden sound-insulating floor for reducing impact sound of a heavy floor.

Background Art

[0002] In recent years, as a floor structure of buildings such as wooden houses, there has been a demand for a wooden sound-insulating floor that satisfies the impact sound insulation performance of a heavy floor and the impact sound insulation performance of a lightweight floor according to JIS A 1418. "Impact sound of a heavy floor" means a dull and low sound that is largely transmitted to the lower floor, such as "thud" or "clunk", when a child jumps or moves a chair. Also, "impact sound of a lightweight floor" means a relatively light and high-pitched sound, such as "clunk" when dropping a spoon on the floor or "pat-pat" when walking in slippers.

[0003] Among these, the impact sound of a lightweight floor can be relatively easily reduced by the material on the surface of the floor material (for example, carpet). On the other hand, it is difficult to reduce the impact sound of a heavy floor only by the material on the surface of the floor material. Therefore, in order to reduce the impact sound of a heavy floor, for example, Patent Document 1 is disclosed.

[0004] The "method for reducing the impact sound of an existing floor slab" in Patent Document 1 proposes fixing and providing a reinforcing member such as an H-shaped steel for reinforcing the existing floor slab on the upper surface of the existing floor slab surrounded by beams such as a large beam or a small beam, and providing support legs for a dry double floor on the upper surface of the reinforcing member.

[0005] Non-Patent Document 1 is a reference regarding the impact sound insulation of a dry-assembled steel floor.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Non-Patent Documents

[0007] [Non-Patent Document 1] Seimei Nakayasu, Koji Hantani, Ryoichi Sugano, Daiji Takahashi, "Evaluation of the impact sound insulation performance of dry-assembled steel floors consisting of flat plates and corrugated plates," Journal of Environmental Engineering, Architectural Institute of Japan, December 2014, Vol. 79, No. 706, pp. 999-1007. [Overview of the project] [Problems that the invention aims to solve]

[0008] Non-patent document 1 states that dry-assembled steel floors, consisting of flat plates and corrugated plates, exhibit directional bending rigidity depending on the shape of the core material. It also states that improving the bending rigidity in the weak axis direction improves the impact sound insulation properties of dry-assembled steel floors.

[0009] However, Patent Document 1 and Non-Patent Document 1 relate to concrete floors in reinforced concrete (RC) buildings, and their application to soundproof wooden floors is difficult. Furthermore, wooden structural floors, such as those constructed using the post-and-beam method, have a lower surface weight and bending rigidity compared to concrete floors, making them more susceptible to vibration and resulting in significantly inferior sound insulation performance against heavy floor impact noise.

[0010] As a means of improving the sound insulation performance of heavy floor impact noise in such wooden structural floors, methods such as using reinforcing members like H-shaped steel or laying heavy facing materials can be employed, as described in Patent Document 1. However, such reinforcing members and facing materials are heavier than wooden beams, making them difficult to handle manually, difficult to process to the dimensions of the site, and resulting in poor work efficiency.

[0011] On the other hand, in conventional post-and-beam construction, the beam structure is unidirectional, resulting in weak rigidity in the direction perpendicular to the beams. Therefore, to improve the sound insulation performance of heavy floor impacts, it is necessary to significantly increase the rigidity in the direction perpendicular to the beams. However, when a double floor is installed on top of a wooden structural floor, the space between the structural floor and the double floor (hereinafter referred to as "floor cavity") has traditionally been used as a route for equipment piping. Therefore, it was desirable that the floor cavity could be used as a route for equipment piping without increasing its height, even when the rigidity in the direction perpendicular to the beams was increased.

[0012] This invention was devised to solve the problems described above. Specifically, the object of this invention is to provide a wooden sound-insulating floor that is suitable for wooden buildings, has good workability, can improve the sound insulation performance of heavy floor impact noise, and allows the floor cavity to be used as a route for equipment piping without increasing the overall height. [Means for solving the problem]

[0013] According to the present invention, a wooden structural floor located between the upper and lower floors of a building, The structure comprises a double floor that is supported on the upper surface of the aforementioned wooden structural floor and extends horizontally, The aforementioned wooden structural floor is fixed at both ends to the building's frame, extends horizontally, and has a plurality of small beams positioned parallel to each other at a first interval in its width direction, A lower floor material fixed to the upper surface of multiple joists and extending horizontally, It has a plurality of floor joists fixed to the upper surface of the lower floor material, extending horizontally perpendicular to the beam, and positioned parallel to each other at a second interval in its width direction, The first and second intervals are set to less than half of the predetermined bending wavelength of the lower floor material. A soundproof wooden floor is provided, wherein the total length of the floor joists is set to be longer than the bending wavelength, and both ends of the floor joists are located at a third interval from the building's structure or the ends of adjacent floor joists. [Effects of the Invention]

[0014] According to the structure of the present invention, the floor joist is fixed to the upper surface of the lower floor material and extends in the horizontal direction (hereinafter referred to as the "joist orthogonal direction") orthogonal to the joists. Further, the total length of the floor joist is set to be longer than a predetermined bending wavelength (for example, about 1.6 m) of the lower floor material, and the first interval between a plurality of joists is set to be less than half of the bending wavelength. With this structure, at least two locations along the entire length of the floor joist are fixed to a plurality of joists, so vibrations corresponding to the bending wavelength of the lower floor material in the joist orthogonal direction in the portion of the structural floor sandwiched between the floor joist and the joists (for example, 63 Hz) can be suppressed.

[0015] In addition, since the second interval between a plurality of floor joists is also set to be less than half of the bending wavelength, vibrations corresponding to the above-mentioned bending wavelength in the joist direction in the portion of the structural floor sandwiched between the floor joist and the joists (for example, 63 Hz) can also be suppressed. Therefore, the integrality of the floor joist, the joists, and the lower floor material is enhanced, and resonance at frequencies important for evaluating the performance of blocking impact sound of a heavy floor (for example, 63 Hz) can be prevented. Thus, it is a wood-based material with good workability suitable for wooden buildings and can improve the performance of blocking impact sound of a heavy floor.

[0016] Also, according to the structure of the present invention, both ends of the floor joist are positioned at a third interval from the building frame or the ends of adjacent floor joists, so the second interval and the third interval of the floor joist can be used as equipment piping routes without increasing the total height of the floor cavity.

Brief Description of the Drawings

[0017] [Figure 1] It is a plan view of a wooden sound-insulating floor according to the present invention. [Figure 2] It is a view taken along the line A-A of FIG. 1. [Figure 3] It is a view taken along the line B-B of FIG. 1. [Figure 4] It is an explanatory diagram of the principle of the wooden structural floor of the present invention. [Figure 5] It is another embodiment view of FIG. 3. [Figure 6] It is an explanatory diagram of the outer edge portion of the upper floor material. [Modes for carrying out the invention]

[0018] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Common parts in each figure are denoted by the same reference numerals, and redundant descriptions are omitted.

[0019] Figure 1 is a plan view of the wooden sound-insulating floor 100 according to the present invention, Figure 2 is a view taken along arrow AA in Figure 1, and Figure 3 is a view taken along arrow BB in Figure 1.

[0020] In Figure 1, 1, 2, and 3 represent the building's structure, while 5 and 6 represent the interior partition walls. Note that the lower flooring material 14 and upper flooring material 24, which will be described later, are not shown in this figure. The building's structural elements 1, 2, and 3 are wooden beams, but they may also be reinforced concrete (RC) beams. The interior partition walls 5 and 6 are located within the living space enclosed by structural elements 1, 2, and 3. In this example, the space enclosed by structural elements 1 and 2 and partition walls 5 and 6 is designated as the living room within the living space.

[0021] In Figures 1 to 3, the wooden soundproof floor 100 comprises a wooden structural floor 10 and a double floor 20. The wooden structural floor 10 is located between the upper and lower floors of the building. The double floor 20 is supported on the upper surface of the wooden structural floor 10 and extends horizontally.

[0022] In Figure 2, the wooden structural floor 10 has multiple joists 12, lower flooring 14, and multiple floor joists 16.

[0023] Multiple joists 12 are fixed at both ends to the building's structural frame 1,3 and extend horizontally. Hereinafter, the longitudinal direction of the joists 12 will be referred to as the "joist direction" or "X direction". Furthermore, the multiple joists 12 are positioned parallel to each other in the width direction, separated by a first interval W1. Hereafter, the width direction of the joists 12 will be referred to as the "joist orthogonal direction" or "Y direction". In this example, the first interval W1 is the distance between the centers of adjacent joists 12. While the first interval W1 is preferably constant, it may vary. The secondary beam 12 is supported at both ends by the structural frame 1,3 and is set to support the entire living space. The secondary beam 12 is, for example, a piece of wood with a width of 15 cm and a height of 33 cm.

[0024] The lower flooring material 14 is fixed to the upper surfaces of multiple joists 12 and extends horizontally. The lower flooring material 14 is a flat plate that completely covers the inside of the building's structural frames 1, 2, and 3 without any gaps. The lower flooring material 14 consists of, for example, multiple plywood sheets, with the Y-direction ends of each plywood sheet positioned close together on the upper surface of the joist 12 and firmly fixed to the joist 12 with nails or the like 18. The thickness of the lower flooring material 14 (plywood) is, for example, 28 mm.

[0025] In Figure 3, multiple floor joists 16 are fixed to the upper surface of the lower flooring material 14, extend in a horizontal direction (Y direction) perpendicular to the beam 12, and are positioned parallel to each other in the width direction (X direction) with a second spacing W2 between them. In this example, the second interval W2 is the distance between the centers of adjacent floor joists 16. While the second interval W2 is preferably constant, it may vary.

[0026] The floor joists 16 are, for example, rectangular pieces of wood, and their height is set lower than the height H of the space between the wooden structural floor 10 and the double floor 20. For example, if the height H of the space between the floor and the floor is 100 to 130 mm, the height of the floor joists 16 should be 70 to 100 mm, which is at least 30 mm lower than that.

[0027] Figure 4 is a diagram illustrating the principle of the wood-based structural floor 10 of the present invention. In this figure, (A) shows the case without floor joists 16, (B) shows the case where the floor joists 16 are shorter than a predetermined bending wavelength λb of the lower floor material 14, and (C) shows the case where the floor joists 16 are longer than the bending wavelength λb of the lower floor material 14.

[0028] In Figure 4(A), both ends of the joist 12 are fixed, but the central part has little resistance to twisting. Therefore, even though the lower floor material 14 is fixed to the joist 12, it has little effect in suppressing vibrations of the lower floor material 14 at the bending wavelength λb. In Figure 4(B), since the length of the floor joist 16 is shorter than the bending wavelength λb, even if a portion of the floor joist 16 is fixed to one of the beams 12, the effect of suppressing vibrations of the lower floor material 14 at the bending wavelength λb remains small. In Figure 4(C), the length of the floor joist 16 is longer than the bending wavelength λb, and the floor joist 16 is fixed to multiple beams 12. In this case, at least two (preferably three) points along the total length L of the floor joist 16 are fixed to multiple beams 12, so that vibrations corresponding to the bending wavelength λb (e.g., 63 Hz) of the lower floor material 14 sandwiched between the floor joist 16 and the beams 12 can be suppressed.

[0029] The bending wavelength λb of the lower flooring material 14 differs depending on the assumed frequency and the strong axis / weak axis direction of the wood-based structural floor 10, but here we consider the bending wave of the lower flooring material 14 at 63 Hz, which is an important frequency for evaluating the impact sound insulation performance of heavy floors. The propagation speed Cb of a bending wave is called a sinusoidal bending wave when the wavelength is sufficiently long compared to the thickness of the plate, and when the calculation formula for bending waves in a beam is applied, it is given by equation (1). The bending wavelength λb of the lower floor material 14 is given by equation (2). Here, f is the frequency, ω is the angular frequency (=2πf), B is the bending stiffness, and M is the surface weight per unit length.

[0030]

number

[0031] Table 1 shows that the lower flooring material 14 is plywood with a thickness of 28 mm, and the bending stiffness B per unit width is 1.1 × 10 4 N·m 2 This is an example calculation assuming a surface weight M of 16.8 kg / m per unit width and unit length.

[0032] [Table 1]

[0033] Table 1 shows that the bending wavelength λb of the lower flooring material 14 is approximately 1.5 to 1.8 m at f = 50 to 60 Hz, and the bending wavelength λb of the lower flooring material 14 is approximately 1.6 m at f = 63 Hz.

[0034] In this invention, the total length L of the floor joist 16 is set to be longer than the bending wavelength λb of the lower floor material 14, as shown in Figure 4 and Table 1. For example, the total length L of the floor joist 16 is at least about 1.5 m, preferably about 1.6 m, and more preferably about 1.8 m. Although the above calculation does not take into account the secondary beam 12, even if the mass of the secondary beam 12 is added to the surface weight M, the bending wavelength λb will still become shorter according to equation (2), so the length of the floor joist 16 described above will be within an appropriate range. Furthermore, if the thickness of the lower flooring material 14 is other than 28 mm, the bending wavelength λb, which can be determined from equation 1, will naturally change.

[0035] The first spacing W1 between the multiple joists 12 is set to less than half of the bending wavelength λb. As is clear from Figure 4(C), this configuration allows at least two (preferably three) points along the entire length L of the floor joist 16 to be fixed to the multiple joists 12. This makes it possible to suppress vibrations (e.g., 63 Hz) in the portion of the structural floor sandwiched between the floor joist 16 and the joists 12 that correspond to the bending wavelength λb in the direction perpendicular to the joists.

[0036] Furthermore, the second spacing W2 between the multiple floor joists 16 is also set to less than half of the bending wavelength λb. This configuration makes it possible to suppress vibrations (e.g., 63 Hz) corresponding to the bending wavelength λb in the direction of the beams in the structural floor portion sandwiched between the floor joists 16 and the beams 12. Therefore, by directly fixing the floor joists 16 and the joists 12 with nails or the like 18, the unity is increased, and resonance at frequencies important for evaluating the heavy floor impact sound insulation performance (e.g., 63 Hz) can be prevented. This makes it possible to improve the heavy floor impact sound insulation performance while using a wood-based material that is easy to process and suitable for wooden buildings.

[0037] In Figure 1, 1a and 3a are partition walls between units, and 2a is an exterior wall. Also, 7 is a utility pipe. In this example, the arrangement of the multiple floor joists 16 in the plan view is staggered, but they may also be aligned in the X and Y directions. Furthermore, both ends of the floor joists 16 are located at a third interval W3 from the ends of the building's partition walls 1a, 3a, exterior wall 2a, interior partition walls 5, 6, or adjacent floor joists 16 in a straight line. The third spacing W3 is set to secure the route for the equipment piping 7. Similarly, the second spacing W2 of the floor joists 16 is also set to secure the route for the equipment piping 7. Therefore, the minimum values ​​of the second spacing W2 and the third spacing W3 should be greater than or equal to the required length (e.g., 200 mm) for securing the equipment piping route. With the above configuration, the second and third intervals W2 and W3 of the floor joists 16 can be used as equipment piping routes without increasing the overall height of the floor cavity.

[0038] In Figure 3, the raised floor 20 has multiple support legs 22 and an upper floor material 24. In this example, the lower ends of the multiple support legs 22 are fixed to the lower floor material 14 and extend upward. The support legs 22 consist of, for example, a combination of vibration-damping rubber, metal bolts, and panel supports. As shown in Figure 1, the support legs 22 are fixed to the upper surface of the lower flooring material 14, avoiding the floor joists 16, and supporting the lower surface of the upper flooring material 24. This configuration allows for a lower height H of the space between the wooden structural floor 10 and the double floor 20, without being affected by the floor joists 16.

[0039] Figure 5 is a diagram of another embodiment of Figure 3. As shown in Figure 5(A), the support legs 22 may be installed between the floor joists 16 and the upper flooring material 24. With this configuration, the entire upper surface of the lower flooring material 14, which does not have floor joists 16, can be used as a route for equipment piping. Alternatively, as shown in Figure 5(B), the support legs 22 may be replaced with vibration-damping rubber and installed between the floor joists 16 and the upper flooring material 24. This configuration allows the entire gap between the floor joists 16 to be used as a route for equipment piping, and also allows the floor cavity height H to be set lower.

[0040] Figure 6 is an explanatory diagram of the outer edge of the upper flooring material 24. The upper flooring material 24 is supported by the upper ends of multiple support legs 22 and extends horizontally. Furthermore, as shown in this figure, the outer edge of the upper flooring material 24 has an air vent 25.

[0041] In order to effectively realize the performance improvements provided by the double floor 20, it is necessary to mitigate the effects of the air springs in the floor cavity. Specifically, as illustrated in Figure 6, it is necessary to provide air vents 25 on the outer edge of the upper floor material 24 and ensure air circulation within the floor cavity to mitigate the rise in sound pressure within the floor cavity when the double floor 20 is vibrated.

[0042] There are two methods for constructing double floors: the floor-first method and the wall-first method. In the floor-first method, the double floor is installed first throughout the entire dwelling unit, and then the partition walls are installed on top of it. In the wall-first method, the partition walls are installed first, and then the double floor is installed in each individual room. The embodiment of the present invention shown in Figure 1 is a floor-first method, but the present invention is not limited thereto and can be similarly applied to a wall-first method.

[0043] The scope of the present invention is not limited to the embodiments described above, but is indicated by the claims, and includes all modifications within the meaning and scope of equivalence to the claims. [Explanation of Symbols]

[0044] H: spatial height, L: total length, W1: first interval, W2: second interval, W3: third interval. λb is the bending wavelength, 1,2,3 are the building structure, 1a,3a are the partition walls between units, and 2a is the exterior wall. 5,6 Partition walls, 7 Equipment piping, 10 Wooden structural floor, 12 Small beams, 14 Lower flooring material, 16 Upper floor joists, 18 Nails, etc., 20 Double floor, 22 Support legs, 24 Upper flooring material, 25 Air vent, 100 Wooden soundproof floor

Claims

1. A wooden structural floor located between the upper and lower floors of a building, The structure comprises a double floor that is supported on the upper surface of the aforementioned wooden structural floor and extends horizontally, The aforementioned wooden structural floor is fixed at both ends to the building's frame, extends horizontally, and has a plurality of small beams positioned parallel to each other at a first interval in its width direction, A lower floor material fixed to the upper surface of multiple joists and extending horizontally, It has a plurality of floor joists fixed to the upper surface of the lower floor material, extending in a horizontal direction perpendicular to the beam, and positioned parallel to each other with a second interval between them in the width direction, The first and second intervals are set to less than half of the predetermined bending wavelength of the lower floor material. A soundproof wooden floor, wherein the total length of the floor joists is set to be longer than the bending wavelength, and both ends of the floor joists are located at a third interval from the building's structure or the ends of adjacent floor joists.

2. The wooden sound-insulating floor according to claim 1, wherein the bending wavelength is 63 Hz, which is used to evaluate the impact sound insulation performance of heavy floors, and the formula for calculating the bending wavelength of the beam is applied to the lower floor material.

3. The soundproof wooden floor according to claim 1, wherein the floor joist is fixed to a plurality of beams at at least two locations along its entire length.

4. The aforementioned double floor comprises a plurality of support legs whose lower ends are fixed to the lower floor material or the upper floor joists and which extend upward, It comprises an upper floor material that is supported by the upper ends of a plurality of support legs and extends horizontally, The wooden soundproof floor according to claim 1, wherein the outer edge of the upper flooring material has an air vent that mitigates the effect of the air spring in the floor cavity of the double floor.

5. The lower flooring material is a flat plate that completely covers the inside of the building's frame, as described in claim 1, for a wooden soundproof floor.

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