JP2024029435A - Wooden sound insulation floor - Google Patents

Abstract

PROBLEM TO BE SOLVED: 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

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a wooden sound insulating floor for reducing heavy floor impact noise.

BACKGROUND ART In recent years, there has been a demand for wooden sound insulating floors that satisfy heavy floor impact sound insulation performance and light floor impact sound insulation performance according to JIS A 1418 as floor structures for buildings such as wooden residential buildings.
"Heavy floor impact noise" refers to the dull, low-pitched sounds that are heard when a child jumps or moves a chair, making a loud "thump" or "clunk" that is transmitted to the floor below. In addition, "light floor impact sound" refers to relatively light, high-pitched sounds, such as the "knock" caused by dropping a spoon or the like on the floor, or the "flop" caused by walking in slippers.

Of these, light floor impact noise can be relatively easily reduced by using the material of the flooring surface (for example, carpet). On the other hand, it is difficult to reduce heavy floor impact noise using only the surface material of the flooring material.
Therefore, in order to reduce the heavy floor impact noise, for example, Patent Document 1 is disclosed.

``Method for reducing heavy floor impact noise of existing floor slabs'' in Patent Document 1 is a method of reinforcing H-shaped steel or the like to stiffen the existing floor slab on the top surface of the existing floor slab surrounded by beams such as large beams or small beams. It is proposed that the members be fixed and that support legs for a dry double floor be provided on the top surface of the reinforcing members.

Furthermore, Non-Patent Document 1 is a reference document regarding the impact sound insulation properties of dry-assembled steel floors for heavy flooring.

Japanese Patent Application Publication No. 2006-265875

Masaaki Nakayasu, Koji Hanya, Ryoichi Kanno, and Daiji Takahashi, "Evaluation of heavy floor impact sound insulation properties of dry-assembled steel floors made of flat plates and corrugated plates," Proceedings of the Architectural Institute of Japan, Environmental Studies, December 2014, No. 79 Volume, No. 706, p. 999-1007

Non-Patent Document 1 states that a dry-assembled steel floor made of flat plates and corrugated plates has directional properties in terms of bending rigidity depending on the shape of the core material. It is also said that by improving the bending rigidity in the weak axis direction, the heavy floor impact sound insulation properties of dry-assembled steel floors will be improved.

However, Patent Document 1 and Non-Patent Document 1 relate to concrete floors of RC (reinforced concrete) buildings, and are difficult to apply to wooden sound-insulating floors.
In addition, compared to concrete floors, wood-based structural floors such as those constructed using frame construction have a lower surface weight and bending rigidity, so they tend to sway more easily when subjected to vibrations, and their performance in blocking heavy floor impact noise is significantly inferior. was there.

As a means of improving the heavy floor impact sound insulation performance of such a wooden structure floor, there are methods such as using reinforcing members such as H-beam steel as in Patent Document 1, and laying heavy surface materials. However, such reinforcing members and face materials are heavier than wooden beams, so they are difficult to handle manually and difficult to process to fit the dimensions of the site, resulting in poor work efficiency.

On the other hand, in the conventional frame construction method, the beam structure is only oriented in one direction, and the rigidity in the direction orthogonal to the beam is weak. Therefore, in order to improve the heavy floor impact sound isolation performance, it is necessary to significantly increase the rigidity in the direction perpendicular to the beam.
However, when a double floor is provided above a wooden structural floor, the space between the structural floor and the double floor (hereinafter referred to as the "floor space") has conventionally been used as an equipment piping route. Therefore, even if the rigidity in the direction perpendicular to the beam is increased, it has been desired to be able to use it as an equipment piping route without increasing the height of the floor space.

The present invention was devised to solve the above-mentioned problems. That is, the object of the present invention is to provide a wood-based material with good workability suitable for wooden buildings, which can improve heavy floor impact sound insulation performance, and which can use floor pockets as equipment piping routes without increasing the overall height. Our goal is to provide a wooden soundproof floor that can.

According to the present invention, a wooden structural floor located between the upper and lower floors of a building;
a double floor supported on the upper surface of the wooden structural floor and extending horizontally;
The wooden structural floor includes a plurality of small beams having both ends fixed to the building frame, extending in the horizontal direction, and located in parallel at a first interval from each other in the width direction;
a lower floor material fixed to the upper surface of the plurality of small beams and extending horizontally;
a plurality of floor joists fixed to the upper surface of the lower flooring material, extending in a horizontal direction orthogonal to the small beams, and located parallel to each other at a second interval in the width direction;
The first spacing and the second spacing are set to be less than half of a predetermined bending wavelength of the lower flooring material,
The total length of the above-mentioned above-mentioned floor joist is set to be longer than the above-mentioned bending wavelength, and both ends of the above-mentioned above-mentioned above-mentioned floor joist are located at a third distance from the frame of the building or the end of the adjacent above-mentioned above-mentioned floor joist. provided.

According to the configuration of the present invention, the floor joists are fixed to the upper surface of the lower flooring material and extend in the horizontal direction perpendicular to the beams (hereinafter referred to as "the beam orthogonal direction"). Further, the total length of the floor joists 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 the plurality of small beams is set to be less than half the bending wavelength.
With this configuration, at least two points along the entire length of the floor joists are fixed to multiple beams, which corresponds to the bending wavelength of the lower floor material in the direction orthogonal to the beams in the part of the structural floor sandwiched between the floor joists and the beams. vibration (for example, 63 Hz) can be suppressed.

In addition, since the second interval between the plurality of floor joists is also set to less than half the bending wavelength, vibrations corresponding to the bending wavelength (for example, 63 Hz) in the direction of the beam in the part of the structural floor sandwiched between the floor joists and the beam ) can also be suppressed.
Therefore, the integrity of the floor joists, small beams, and lower flooring materials is enhanced, and resonance at frequencies important for evaluating heavy floor impact sound isolation performance (for example, 63 Hz) can be prevented, making it easy to process and suitable for wooden buildings. It is wood-based and can improve heavy floor impact sound isolation performance.

Further, according to the above configuration of the present invention, since both ends of the floor joist are located at the third interval from the building frame or the end of the adjacent floor joist, the height of the floor joist can be increased without increasing the total height of the floor joist. The second interval and the third interval can be used as equipment piping routes.

FIG. 1 is a plan view of a wooden sound insulating floor according to the present invention. 2 is a view taken along the line AA in FIG. 1. FIG. 2 is a view taken along the line BB in FIG. 1. FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating the principle of the wooden structural floor of the present invention. FIG. 4 is another embodiment of FIG. 3; It is an explanatory view of the outer edge part of the upper floor material.

Hereinafter, preferred embodiments of the present invention will be described in detail based on the accompanying drawings. Note that common parts in each figure are given the same reference numerals, and redundant explanation will be omitted.

FIG. 1 is a plan view of a wooden sound insulating floor 100 according to the present invention, FIG. 2 is a view taken along the line AA in FIG. 1, and FIG. 3 is a view taken along the line BB in FIG.

In FIG. 1, reference numerals 1, 2, and 3 indicate the framework of a building, and 5 and 6 indicate partition walls within the building. Note that, in this figure, illustration of a lower flooring material 14 and an upper flooring material 24, which will be described later, is omitted.
The building frames 1, 2, and 3 are wooden beams, but may also be RC (reinforced concrete) beams. Partition walls 5 and 6 in the building are located in living rooms surrounded by frames 1, 2 and 3. Further, in this example, a space surrounded by the frames 1 and 2 and partition walls 5 and 6 is set as a living room in the living room.

In FIGS. 1 to 3, the wooden sound insulating floor 100 includes a wooden structural floor 10 and a double floor 20.
The wooden structural floor 10 is located between the upper and lower floors of a building. The double floor 20 is supported on the upper surface of the wooden structural floor 10 and extends horizontally.

In FIG. 2, the wooden structural floor 10 has a plurality of small beams 12, a lower floor material 14, and a plurality of floor joists 16.

Both ends of the plurality of small beams 12 are fixed to the building frames 1 and 3, and extend in the horizontal direction. Hereinafter, the length direction of the small beam 12 will be referred to as the "small beam direction" or the "X direction."
Moreover, the plurality of small beams 12 are located in parallel with each other at a first interval W1 in the width direction. Hereinafter, the width direction of the small beam 12 will be referred to as the "beam orthogonal direction" or the "Y direction."
In this example, the first interval W1 is the distance between the centers of adjacent beams 12. The first interval W1 is preferably constant, but may vary.
The small beam 12 is supported at both ends by the frames 1 and 3 and is set so as to indicate the entire living room. The small beam 12 is, for example, a piece of wood with a width of 15 cm and a height of 33 cm.

The lower floor material 14 is fixed to the upper surface of the plurality of small beams 12 and extends horizontally. The lower floor material 14 is a flat plate that covers the inside of the building frames 1, 2, and 3 without any gaps.
The lower floor material 14 is, for example, a plurality of plywood boards, and the ends of each plywood board in the Y direction are located close to each other on the upper surface of the small beam 12, and are firmly fixed to the small beam 12 with nails or the like 18. The thickness of the lower flooring material 14 (plywood) is, for example, 28 mm.

In FIG. 3, the plurality of floor joists 16 are fixed to the upper surface of the lower flooring material 14, extend in the horizontal direction (Y direction) orthogonal to the beam 12, and are spaced apart from each other by a second interval W2 in the width direction (X direction). located parallel to each other.
In this example, the second interval W2 is the distance between the cores of adjacent floor joists 16. The second interval W2 is preferably constant, but may vary.

The floor joist 16 is made of, for example, a rectangular piece of wood, and its height is set lower than the spatial height H of the floor space sandwiched between the wooden structural floor 10 and the double floor 20. For example, when the spatial height H of the floor pocket is 100 to 130 mm, the height of the floor joists 16 is preferably 70 to 100 mm, which is 30 mm or more lower than that.

FIG. 4 is an explanatory diagram of the principle of the wooden structural floor 10 of the present invention. In this figure, (A) shows a case where the above-floor joist 16 is not present, (B) shows a case where the above-floor joist 16 is shorter than the predetermined bending wavelength λb of the lower flooring material 14, and (C) shows a case where the above-floor joist 16 is less than the lower flooring material 14. A case longer than the bending wavelength λb is shown.

In FIG. 4(A), both ends of the small beam 12 are fixed, but the center portion has little resistance to twisting. Therefore, even if the lower flooring material 14 is fixed to the small beam 12, the effect of suppressing the vibration of the bending wavelength λb of the lower flooring material 14 is small.
In FIG. 4B, since the length of the floor joist 16 is shorter than the bending wavelength λb, even if a part of the floor joist 16 is fixed to one of the beams 12, the bending wavelength λb of the lower flooring material 14 is shorter than the bending wavelength λb. The effect of suppressing vibration is still small.
In FIG. 4C, the length of the floor joist 16 is longer than the bending wavelength λb, and the floor joist 16 is fixed to the plurality of small beams 12. In this case, at least two points (preferably three points) of the entire length L of the floor joist 16 are fixed to the plurality of beams 12, so the bending wavelength λb of the lower floor material 14 sandwiched between the floor joist 16 and the beams 12 is It is possible to suppress vibrations corresponding to (for example, 63 Hz).

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 wooden structural floor 10, but here, the bending wavelength λb of the lower flooring material at a frequency of 63 Hz, which is an important frequency for evaluating heavy floor impact sound isolation performance, is used. Consider 14 bending waves.
The propagation speed Cb of the bending wave is called a sine bending wave when the wavelength is sufficiently long compared to the thickness of the plate, and is expressed by equation (1) when the calculation formula for the bending wave of a beam is applied. Further, the bending wavelength λb of the lower floor material 14 is expressed by equation (2).
Here, f is the frequency, ω is the angular frequency (=2πf), B is the bending rigidity, and M is the surface weight of unit length.

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

From Table 1, the bending wavelength λb of the lower floor material 14 at f=50 to 60 Hz is about 1.5 to 1.8 m, and the bending wavelength λb of the lower floor material 14 at f=63 Hz is about 1.6 m.

In the present invention, the total length L of the floor joists 16 is set to be longer than the bending wavelength λb of the lower flooring material 14 from the results shown in FIG. 4 and Table 1. For example, the total length L of the floor joist 16 is preferably at least about 1.5 m or more, preferably about 1.6 m or more, and more preferably about 1.8 m or more.
Although the beam 12 is not considered in the above calculation, even when the mass of the beam 12 is taken into account in the surface weight M, the bending wavelength λb tends to be shorter based on equation (2). It can be said that the length of the above-mentioned floor joists 16 falls within an appropriate range.
Moreover, when the thickness of the lower flooring material 14 is other than 28 mm, the bending wavelength λb determined from Equation 1 naturally changes.

The first interval W1 between the plurality of small beams 12 is set to be less than half the bending wavelength λb. As is clear from FIG. 4(C), with this configuration, at least two locations (preferably three locations) of the entire length L of the floor joist 16 are fixed to the plurality of small beams 12. Thereby, it is possible to suppress vibrations (for example, 63 Hz) corresponding to the bending wavelength λb in the direction orthogonal to the beams in the portion of the structural floor sandwiched between the floor joists 16 and the beams 12.

Further, the second interval W2 between the plurality of floor joists 16 is also set to less than half of the bending wavelength λb. With this configuration, vibrations corresponding to the bending wavelength λb (for example, 63 Hz) in the beam direction of the portion of the structural floor sandwiched between the floor joists 16 and the beams 12 can also be suppressed.
Therefore, by directly fixing the floor joists 16 and the beams 12 with nails or the like 18, the integrity is enhanced and resonance at a frequency (for example, 63 Hz), which is important for evaluating heavy floor impact sound isolation performance, can be prevented. As a result, it is a wood-based material with good workability that is suitable for wooden buildings, and it is possible to improve heavy floor impact sound insulation performance.

In FIG. 1, 1a and 3a are partition walls, and 2a is an outer wall. Further, 7 is equipment piping.
In this example, the plurality of floor joists 16 are arranged in a staggered manner in the plan view, but they may be arranged in the X direction and the Y direction.
Further, both ends of the floor joist 16 are located at a third interval W3 from the boundary walls 1a, 3a of the building, the outer wall 2a, the partition walls 5, 6, or the ends of the linearly adjacent floor joists 16.
The third interval W3 is set to ensure a route for the equipment piping 7. Similarly, the second interval W2 between the floor joists 16 is also set to ensure a route for the equipment piping 7. Therefore, the minimum value of the second interval W2 and the third interval W3 is preferably equal to or longer than the required length (for example, 200 mm) to secure the equipment piping route.
With the above-described configuration, the second interval W2 and the third interval W3 between the floor joists 16 can be used as the equipment piping route without increasing the total height of the floor space.

In FIG. 3, the double floor 20 has a plurality of support legs 22 and an upper flooring 24.
In this example, the plurality of support legs 22 have lower ends fixed to the lower flooring 14 and extend upward. The support legs 22 are made of, for example, a combination of anti-vibration rubber, metal bolts, and panel supports.
As shown in FIG. 1, the support legs 22 are fixed to the upper surface of the lower flooring material 14, avoiding the floor joists 16, and support the lower surface of the upper flooring material 24. With this configuration, the spatial height H of the floor space sandwiched between the wooden structural floor 10 and the double floor 20 can be set low without being affected by the floor joists 16.

FIG. 5 is a diagram of another embodiment of FIG. 3.
As shown in FIG. 5(A), the support legs 22 may be installed between the floor joists 16 and the upper floor material 24. With this configuration, the entire upper surface of the lower floor material 14 without the floor joists 16 can be used as an equipment piping route.
Further, as shown in FIG. 5(B), the support legs 22 may be replaced with vibration-proof rubber and installed between the floor joists 16 and the upper floor material 24. With this configuration, the entire gap between the floor joists 16 can be used as an equipment piping route, and the spatial height H of the floor pocket can be set low.

FIG. 6 is an explanatory diagram of the outer edge portion of the upper floor material 24. As shown in FIG.
The upper floor material 24 is supported by the upper ends of the plurality of support legs 22 and extends horizontally. Further, as shown in this figure, the outer edge of the upper floor material 24 has an air vent 25.

In order to effectively exhibit the performance improvement provided by the double floor 20, it is necessary to alleviate the influence of the air springs in the floor pocket. Specifically, as illustrated in FIG. 6, an air vent 25 is provided at the outer edge of the upper floor material 24, and air circulation within the floor pocket is ensured to prevent the double floor 20 from being vibrated. It is necessary to alleviate the increase in sound pressure within the floor pocket.

There are two types of construction methods for double floors: the floor-first method and the wall-first method. The floor-advance method is a method in which a double floor is constructed in advance for the entire dwelling unit, and a partition wall is installed on top of it.The wall-advance method is a method in which a partition wall is constructed in advance and a double floor is installed in each living room. This is a construction method.
Although the embodiment of the present invention shown in FIG. 1 is a floor-first method, the present invention is not limited thereto, and can be similarly applied to a wall-first method.

The scope of the present invention is not limited to the embodiments described above, but is indicated by the claims, and includes all changes within the meaning and range equivalent to the claims.

H spatial height, L total length, W1 first interval, W2 second interval, W3 third interval,
λb bending wavelength, 1, 2, 3 frame, 1a, 3a door boundary wall, 2a external wall,
5, 6 Partition wall, 7 Equipment piping, 10 Wooden structural floor, 12 Small beam,
14 Lower flooring, 16 Floor joists, 18 Nails, etc., 20 Double floor, 22 Support legs,
24 Upper floor material, 25 Air vent, 100 Wooden sound insulation floor

Claims (5)

A wooden structural floor located between the upper and lower floors of a building,
a double floor supported on the upper surface of the wooden structural floor and extending horizontally;
The wooden structural floor includes a plurality of small beams having both ends fixed to the building frame, extending in the horizontal direction, and located in parallel with each other at a first interval in the width direction;
a lower floor material fixed to the upper surface of the plurality of small beams and extending horizontally;
a plurality of floor joists fixed to the upper surface of the lower flooring material, extending in a horizontal direction perpendicular to the small beams, and located parallel to each other at a second interval in the width direction;
The first spacing and the second spacing are set to be less than half of a predetermined bending wavelength of the lower flooring material,
The total length of the above-mentioned floor joist is set to be longer than the bending wavelength, and both ends of the above-mentioned floor joist are located at a third interval from the end of the frame of the building or the adjacent above-mentioned floor joist. The wooden sound insulating floor according to claim 1, wherein the bending wavelength is 63 Hz, which is used for evaluating heavy floor impact sound isolation performance, and a calculation formula for the bending wavelength of a beam is applied to the lower flooring material. The wooden sound insulating floor according to claim 1, wherein the floor joist is fixed to the plurality of small beams at at least two points along its entire length. The double floor has a plurality of support legs whose lower ends are fixed to the lower floor material or the floor joist and extend upward;
an upper flooring member supported by the upper ends of the plurality of support legs and extending horizontally;
The wooden sound insulating floor according to claim 1, wherein the outer edge of the upper flooring has an air vent that alleviates the influence of air springs in the floor pocket of the double floor. The wooden sound insulating floor according to claim 1, wherein the lower flooring is a flat plate that covers the inside of the building frame without any gaps.

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