JPH0467544B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is designed to reduce the transmission of floor impact noises generated when children, etc. jump on the floors of houses, especially apartment complexes, from being transmitted to the floors below. This invention relates to a floating floor structure with excellent sound insulation performance.

(Prior art) Floor impact noise is generated when the impact force caused by people walking, jumping, etc. causes the floor structure to vibrate, and the vibrations emit sound to the lower floor. . This floor impact sound includes the floor impact sound caused by a light impact force such as when a person walks, and the weight impact sound caused by a child jumping (effective impact force of 3875N in a heavy floor impact sound generator specified in JIS-A1418). There is a floor impact sound caused by the corresponding impact force). Among the floor impact sounds mentioned above, those caused by light impact force can be reduced by absorbing the impact force by using floor finishing materials such as carpets, but those caused by weight impact force can be reduced by absorbing the impact force into the flooring. The vibrations were easily transmitted and caused the subfloor itself to vibrate, making it difficult to reduce the vibrations.

A floating floor structure is known as a floor structure for reducing such floor impact noise. This conventional floating floor consists of a glass wool cushioning layer placed on a concrete floor slab, a floor panel material placed directly on top of it, and a floor finishing material such as carpet or wood floor placed on top of that. Alternatively, as shown in FIG. 11, a support c such as a joist material is arranged on the buffer material layer b on the concrete floor slab a, and a floor panel material d is placed thereon between it and the buffer material layer b. air layer e
There is also a floor finishing material f which is placed on the concrete floor while holding it, and in both cases, the shock force is prevented from being directly transmitted to the concrete floor slab a due to the cushioning properties of the glass wool cushioning material layer b. It is designed to prevent this.

According to the above-mentioned conventional floating floor structure, in the former one in which the floor panel material is placed directly on the cushioning material layer, when floor impact force acts, the floor panel material bends and deforms, and the impact force is applied to the cushioning material layer. It becomes concentrated,
It is transmitted to the floor slab without much absorption or relaxation in the buffer material layer, resulting in poor cushioning properties. On the other hand, in the latter case where the floor panel material d is placed on the cushioning material layer b via the support c, the impact force P is dispersed by the support c and transmitted to the cushioning material layer b. , this dispersion force P ₁
is absorbed and relaxed by the cushioning material layer b, so that the impact force applied to the subfloor a is small and dispersed,
The floor impact sound emitted downstairs is smaller, and compared to the case where no cushioning material layer is provided, the floor impact sound is lower overall, and the sound insulation grade according to the floor impact sound level of the Architectural Institute of Japan standards is L-55. Therefore, as a practical experience in daily life, even if the sound caused by impact is a little bothersome, if you live your life with care, you can reduce floor impact noise to a level where it does not become a problem.

(Problem to be solved by the invention) However, in recent years, with respect for privacy and the rise in the height of residential buildings, even better sound insulation performance has been required.
The performance limit is L-50 as a sound insulation grade.
It was difficult to reduce the floor impact noise to a level where it was hardly noticeable, such as the L-45 and the L-45.

Considering the reason for this, in the conventional floating floor structure mentioned above, when a large impact force of 3875N as specified by JIS is applied, a large bending deformation occurs instantaneously as shown in Figure 11, causing a large bend in the floor surface. Vibration occurs. The vibration frequency of this bending vibration changes depending on the size of the floor panel material d and the spacing of the supports c placed below it, but the larger the vibration is, or the longer the vibration continues, the more the It is estimated that vibrations of the above frequency are applied to the slab, and as a result, the sound emitted downstairs becomes louder, making it impossible for the floor impact sound level to satisfy the standard value.

Furthermore, in a floating floor structure in which a support is placed on a cushioning material layer, when the floor panel material d is bent and deformed due to floor impact force, the air layer e between the panel material d and the cushioning material layer b is The air is compressed as its flow is blocked by the supports, and part of this air pressure escapes laterally between the supports, but part of it acts as an air spring in the vertical direction and flows through the cushioning material layer b. A force P' is transmitted to the floor slab a, and the reaction force from the pneumatic buffer material layer b acts on the floor panel material d, causing the floor panel material d to undergo bending vibration. In other words, it is estimated that the vibrations of the floor slab a and the floor panel d are amplified due to the compression and expansion forces acting on the air layer e, and the floor impact sound is amplified.

The first and second inventions of the present application are based on such a conjecture, and if the compression and expansion forces acting on the air layer between the cushioning material layer and the floor panel material are reduced when floor impact force is applied as described above, the floor The bending vibration of the panel material quickly subsides, reducing the force transmitted to the flooring substrate through the cushioning material layer and the force transmitted to the floor panel material, and as a result, the vibration of the floor panel material and the flooring material can be significantly reduced. By focusing on what we can do, we can reduce not only the bending vibrations on the surface of the flooring material, but also the vibrations of the subfloor itself, resulting in sound insulation performance that is higher than the floor impact sound level L-55, which was the limit of conventional floating floor structures. For example, L-50, L
The purpose is to demonstrate sound insulation performance such as -45.

(Means for Solving the Problems) For the above-mentioned purpose, the first and second inventions of the present application provide for the action of air that acts in the vertical direction in the air layer when a floor impact force acts, that is, to To reduce the compression and expansion force of the air layer that promotes bending vibration of the panel material by letting the air not only escape laterally between the supports but also vertically or horizontally through the inside of the panel. It is in.

Specifically, the solution taken by the first invention of the present application is that a cushioning material layer is provided on the subfloor made of a concrete slab or the like, and a plurality of panel materials are supported at an appropriate height on the cushioning material layer. It is placed side by side with an air layer maintained between the cushioning material layer and the cushioning material layer through the body,
A floating floor structure is assumed in which a suitable floor finishing layer is placed on the panel material. The air layer is connected to the side surface or top surface of the panel material so that when a floor impact force is applied to the panel material, the compressed air in the air layer passes through the inside of the panel material and flows out from the side surface or top surface of the panel material. It has a structure in which a communicating ventilation hole is provided.

In addition, the solution taken by the second invention of the present application is that a cushioning material layer is provided on the subfloor made of a concrete slab or the like, and a plurality of panel materials are placed on the cushioning material layer with supports of appropriate heights. The object is a floating floor structure in which the floating floor structure is placed side by side with an air layer maintained between the cushioning material layer and the buffer material layer. The panel material is provided with ventilation holes that penetrate vertically so as to allow the compressed air in the air layer to flow out through the interior of the panel material to the upper surface of the panel material when a floor impact force is applied. A floor finishing material is placed on the top surface of the panel material, and the compressed air that has flowed out onto the top surface of the panel material is further transferred from the top surface of the panel material to the bottom surface of the floor finishing material or to the fellow floor finishing materials. A ventilation layer is formed between the two to allow water to flow out.

(Function) With the above configuration, in the first and second inventions of the present application, when an impact force is applied to the floor surface, this impact force is dispersed by the support and transmitted to the cushioning material layer. It is effectively absorbed and relaxed by compressive deformation. At the same time, the panel material bends and deforms due to the floor impact force, compressing the air in the air layer below, but this compressed air not only escapes laterally, but also
Since the air flows out from the side or top surface of the panel material through the ventilation holes, the air acting perpendicularly to the bottom surface of the panel material in this air layer acts as a compressor.
The expansion force is rapidly reduced, which reduces the force transmitted to the subfloor via air pressure and the force transmitted to the panel material as a reaction force of this air pressure, reducing bending vibration of the subfloor and panel material. Further, in the second invention, since the ventilation layer is provided on the back or side surface of the floor finishing material placed on the upper surface of the panel material, the floor finishing material does not hinder the reduction of the compression/expansion force of the air layer. Therefore, the propagation of the floor impact sound generated by the vibration of the subfloor to the lower floors is effectively reduced, and high sound insulation performance such as L-50 and L-45, which was difficult to achieve with conventional dry floors, is achieved. It is possible to demonstrate this.

(Example) First, an example of the first invention of the present application will be described based on the drawings.

1 and 2 show a floating floor structure according to an embodiment of the first invention, in which 1 is a floor base made of a concrete slab or the like, and on the floor base 1 is a porous material such as glass wool or rock wool. A cushioning material layer 2 made of the following is provided. On the cushioning material layer 2, there are a plurality of panel materials 3 made of hollow panels,
3... are placed in parallel with each other with an air layer 5 held between them and the cushioning material layer 2 via a plurality of supports 4, 4.... Inside the panel material 3, there are a plurality of hollow holes 3 that penetrate in the long side direction and open on the short side side surface.
a, 3a, . . . are formed in a horizontal row, and a plurality of the supports 4 are arranged at suitable intervals along the short side direction of the lower surface of the panel material 3, for example. still,
The supports 4 may be spaced apart to allow the air in the air layer 5 on the lower surface of the panel material 3 to flow smoothly in the lateral direction, or holes may be provided in the supports. Further, a floor finishing material 6 is provided on the upper surface of the panel material 3.

In addition to the above-mentioned hollow panel, the panel material 3 may include plywood, as shown in FIGS. 5 and 6.
There are solid panels such as LVL (Laminated Veneer Lumber), particle boards, wooden panels such as wood cement boards, reinforced mortar panels, concrete panels, GRC panels, inorganic panels such as cement extruded panels, etc. Furthermore, in order to increase bending rigidity, there are composite panels in which materials with strong tensile strength such as steel plates and FRP plates are bonded together. As this composite panel, for example, as shown in FIGS. 3 and 4, a wooden hollow panel 3A with slate plates 3b and 3b bonded to the upper and lower surfaces thereof is used.

As a feature of the first invention of the present application, the panel material 3 is provided with a plurality of ventilation holes 7, 7... that communicate the air layer 5 below and the hollow hole 3a, so that floor impact force acts At this time, the air in the air layer 5 below the panel material 3 is compressed due to the bending deformation of the panel material 3 and the sinking of the panel material 3 due to the compressive strain of the cushioning material layer 2, but this compressed air is It is configured to flow out from the side surface of the panel material 3 through the ventilation hole 7 and the hollow hole 3a.

In addition, as shown in FIGS. 3 and 4, the ventilation holes correspond to the ventilation holes 7 that vertically penetrate the panel material 3 through the hollow holes 3a of the panel material 3, and the ventilation holes 7, as shown in FIGS. A ventilation hole 8 is formed to vertically penetrate through the floor finishing material 6, and as shown in FIG. In addition to letting the water flow out from the sides, it may also be made to flow upward from the floor covering material 6 on the top surface of the panel material 3 through the ventilation holes 7 and 8. Alternatively, as shown in FIG. 7a may be provided to allow air to flow between each hollow part, and by combining these, air can flow out even more smoothly. In this case, a breathable carpet or the like is arranged on the floor finishing material 6.

Further, as an embodiment of the second invention of the present application, as shown in FIG. By opening the upper end of the ventilation hole 7 that penetrates the upper and lower surfaces of the panel material 3 to form the ventilation layer 9a, air can be prevented from flowing out from the upper surface of the panel material 3 at the joint between the floor finishing materials 6, 6. It can be done smoothly.

As another embodiment of the second invention of the present application, as shown in FIG. 6 and FIG. A ventilation layer 10a made of lattice grooves 10 and a net-like body (not shown) is formed on the (back side), and a ventilation layer 10a is formed using the lattice grooves 10 and a net-like body (not shown). The air may be allowed to flow out into the room. Also,
In this case, air may be allowed to flow out from the rear surface of the wall, that is, between the finished wall surface and the concrete wall.

Therefore, in each of the above embodiments, when an impact force P is applied to the floor surface, this impact force P is dispersed by the support 4 that supports the panel material 3 and transmitted to the cushioning material layer 2, Since this dispersion force P ₁ is absorbed and relaxed by compressive deformation of the cushioning material layer 2, transmission to the subfloor 1 is effectively suppressed and vibration of the subfloor 1 is reduced. At the same time, the rigid panel material 3 is bent and deformed by the floor impact force P, and sinks by the compressive strain of the cushioning material layer 2, compressing the air in the air layer 5 below. Not only does it escape laterally between the supports 4, but it also escapes from the panel material 3 through the ventilation holes 7 that are opened on the bottom surface of the panel material 3 so as to communicate with the air layer 5, as shown in FIG. 8 or 9. Since the air pressure in the air layer that is diffused inside and flows out from both the sides or the top surface and is sandwiched between the supports 4 and 4 quickly decreases, the air acting in the vertical direction in this air layer 5 as in the conventional case movement (compression/expansion force) is reduced, and the transmission of impact force to the cushioning material layer 2 and floor subfloor 1 below the panel material 3 via this air pressure is reduced, and the reaction force of this air pressure is reduced upward. The transmission to the panel material 3 is reduced. As a result, the vibration of the floor subfloor 1 is suppressed, and the bending vibration and vertical vibration of the panel material 3 are reduced, and this synergistic effect can effectively reduce the propagation of floor impact sound downstairs. .

(Experiment Example) Next, specifically, a slate-covered wooden hollow panel with a width of 909 mm, a length of 1818 mm, and a thickness of 60 mm is prepared as a panel material. This hollow panel is made of a composite panel made of 5mm thick slate glued to the surface of 15mm thick plywood as a face material, and 20 x 20mm wooden crosspieces are arranged at 40mm intervals between the two sides of the panel. The side panels are provided with 15mmφ ventilation holes at a pitch of 200mm, at a rate of 40 holes per sheet. And concrete slab (density 2300Kg/m ³ , thickness 150mm)
Glass wool with a density of 64 Kg/m ³ and a thickness of 50 mm is placed on top, and on top of that, multiple plywood supports with a thickness of 12 mm and a width of 60 mm are arranged at a pitch of 450 mm, and then multiple hollow panels are placed on top of the glass wool. Place the book on top and add a thickness of 12
A floating floor is made by fixing plywood floor finishing material of mm in size by nailing (Example 1 of the present invention). JIS− for this floor
When impact force was applied using a weight impact sound generator specified in A1418, and floor impact noise was measured from downstairs, the sound insulation performance as shown by line A in Figure 10 was obtained.

In addition, as Example 2 of the present invention, a hollow panel in which ventilation holes were also provided in the upper side material of the hollow panel of Example 1 of the present invention in correspondence with the ventilation holes of the lower side material was used, and the arrangement was made under the same conditions as above. and created a floating floor.
In addition, align the position of the ventilation hole of the upper side material with the joint part of the floor finishing material, and nail the floor finishing material with a gap between the joint part so as not to block the exhaust air from the ventilation hole as much as possible. Established. The measurement results of this sound insulation performance are shown by line B in FIG.

On the other hand, for comparison with the above-mentioned example of the present invention, a hollow panel without ventilation holes was used as Comparative Example 1, and the measurement results of the sound insulation performance in that case are shown by line C in Fig. 10. . Further, as Comparative Example 2, the sound insulation performance of the concrete slab itself was measured, and the results shown by line D in FIG. 10 were obtained.

As is clear from FIG. 10, invention examples 1 and 2
In this case, although a hollow panel having the same shape and size as Comparative Example 1 was placed on the cushioning material layer,
When the air layer below the hollow panel is compressed by impact, it is structured so that it can be exhausted from the side surface or both the side surface and the top surface through the hollow part of the panel, so that when the impact force is applied, the compressed air pressure is almost Since the air is discharged and lowered at the same time, the transmission of impact force directly below the hollow panel via air pressure is reduced, and the bending vibration of the hollow panel due to the reaction force of air pressure is also reduced, compared to Comparative Example 1. It can be seen that the passing sound can be reduced by 5 to 15 dB without changing the thickness of the buffer material or the thickness of the buffer material layer. Therefore, the sound insulation grade of Comparative Example 1 is about L-57,
The performance is such that the floor impact sound can be heard as "slightly bothersome", whereas in Inventive Example 1, the sound insulation grade is reduced to L-48, so that the floor impact sound is "almost unnoticeable". Furthermore, if air pressure is used to smoothly discharge the air as in Example 2 of the present invention, the sound insulation grade is further reduced to L-44, and the floor impact sound becomes ``not noticeable'' or ``can be heard from a distance.'' ``This can be significantly reduced.

(Effect of the invention) As explained above, according to the floating floor structures of the first and second inventions of the present application, when floor impact force is applied,
The air pressure in the air layer below the panel material is instantly discharged to the outside from the panel side surface and panel top surface, and the impact force is transmitted to the subfloor through the air pressure, and the bending vibration of the panel material due to the reaction force of the air pressure is reduced. This reduces the vibration of the subfloor itself and the bending vibration of the panel material, reducing the vibration of the subfloor, emitting less floor impact noise, and demonstrating excellent sound insulation performance. . Therefore, it is possible to provide a floor structure suitable for high-rise buildings. In addition, the flow of air under the floor reduces the accumulation of moisture and prevents condensation under the floor.

[Brief explanation of the drawing]

1 to 9 illustrate embodiments of the first and second inventions of the present application, FIG. 1 is a sectional view showing a floating floor structure of an embodiment of the first invention, and FIG. 2 is a perspective view of the same. be.
FIG. 3 and FIG. 4 are a sectional view and a perspective view, respectively, showing a modified example. 5 and 6 are perspective views showing air outflow structures as embodiments of the second invention, respectively, and FIG. 7 is a perspective view of the floor finishing material of FIG. 6 viewed from the back side. FIGS. 8 and 9 are explanatory views showing the outflow flow of air from the air layer when floor impact force is applied, respectively. FIG. 10 is a measurement result diagram showing the sound insulation performance of the example of the present invention in comparison with a comparative example. FIG. 11 is a sectional view showing a conventional floating floor. DESCRIPTION OF SYMBOLS 1... Floor base, 2... Cushioning material layer, 3... Rigid panel material, 3a... Hollow hole, 4... Support, 5...
Air layer, 6...Floor finishing material, 7...Vent hole, 9
a, 10a... ventilation layer.

Claims (1)

[Scope of Claims] 1. A cushioning material layer is provided on a subfloor made of a concrete slab or the like, and on top of the cushioning material layer, a plurality of panel materials are connected to the cushioning material layer through supports of appropriate heights. It is a floating floor structure in which the panels are placed side by side with an air layer between them, and when a floor impact force is applied to the panel material, compressed air from the air layer is passed through the inside of the panel material. A floating floor structure, characterized in that a ventilation hole is provided that communicates the air layer with the side surface or top surface of the panel material so as to allow the air to flow out from the side surface or top surface of the panel material. 2. The floating floor structure according to claim 1, wherein the panel material is a hollow panel having a hollow part opening on the side surface, and the ventilation hole communicates the air layer with the hollow part. 3. The panel material is made of a hollow panel having a hollow part opening on the side surface, and a ventilation hole is provided that communicates the lower surface and the upper surface of the hollow panel through the hollow part,
The floating floor structure according to claim 1, wherein the air in the air layer is made to flow out from both the side surface and the surface of the panel material through the hollow part of the hollow panel. 4. A buffer material layer is provided on the subfloor made of concrete slab etc., and on top of the buffer material layer, a plurality of panel materials are placed with an air layer between them and the buffer material layer via supports of appropriate heights. It is a floating floor structure in which the panels are placed side by side in a held state, and when a floor impact force is applied to the panel materials, the compressed air in the air layer flows out through the inside of the panel materials to the upper surface of the panel materials. Ventilation holes are provided that pass through the top and bottom of the panel material, and a floor finishing material is placed on the top surface of the panel material. The floating floor structure is further characterized in that a ventilation layer is formed to allow the flow to flow from the upper surface of the panel material to the lower surface of the floor finishing material or between the floor finishing materials.