JPH0663347B2 - Soundproof floor structure and cushioning material for underfloor - Google Patents

Description

TECHNICAL FIELD The present invention relates to a soundproof floor structure and an underfloor cushioning material that reduce the propagation of floor impact sound downstairs on an upper floor.

(Prior Art) Conventionally, various types of this kind of soundproof floor structure have been known. As an example thereof, as shown in FIG. 10, a cushioning mat b is arranged on a floor base a, and this cushioning mat is formed. The floor panel d is laid on the floor b with the joist c interposed, and the floor finishing material e is applied on the floor panel d. As shown in FIG. 11, the cushioning mat b is provided on the floor base a. A floor structure of a floating floor by a dry method in which a floor panel d is laid directly on the cushioning mat b and a floor finishing material e is applied on the floor panel d is known.

(Problems to be solved by the invention) The floor impact sound includes heavy impact sound generated by heavy floor impact force such as when a child jumps on the upper floor, and slippers on the upper floor. There are two types: a light impact sound generated by a light floor impact force such as when walking.

However, the floating floor structure of FIG. 10 has a soundproof effect against light weight impact noise, but satisfies the soundproof effect against heavy impact noise as specified in JIS-A-1418 and JIS-A-1419. Can't get The reason is that the joists supporting the floor panel materials are usually provided at intervals so that the floor materials can be supported. Therefore, a heavy floor impact force, for example, a large impact force of 3900N, is exerted on the floor panel of the upper floor. When added to the timber, the impact force on the upper floor concentrates on the joists via the floor panel material, and only the part of the cushioning mat in contact with the joists contributes to the impact force absorption, so the shock absorbing function of the cushioning mat is sufficient. This is because the soundproofing effect cannot be obtained and a satisfactory soundproofing effect cannot be obtained.

On the other hand, the floor structure of Fig. 11 absorbs the impact force of the upper floor on the entire surface of the cushioning mat, so it has a soundproof effect against heavy impact noise, but it does not absorb light impact noise when walking with slippers. With such a lightweight floor impact force, since the cushioning mat hardly undergoes compressive deformation, the impact force absorption effect is small and a satisfactory soundproofing effect cannot be obtained.

(Object of the Invention) In view of the above, an object of the present invention is to provide a soundproof floor structure and an underfloor cushioning material that have a soundproof effect against both lightweight impact sound and heavy impact sound.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the inventions of claims (1) and (2) are such that, when a lightweight floor impact force is applied to the floor panel between the floor panel and the cushioning mat. The impact mat is partially compressed and deformed, and when a heavy floor impact force such as when a child jumps on the floor panel is applied, a member that sinks into the cushion mat and abuts the floor panel and the cushion mat is interposed. JIS-A is used as the standard value for the weight floor impact force.
-Based on the impact force of 3900N based on the tire drop method referred to in the floor impact sound level measurement method specified in -1418, and as a standard value for lightweight floor impact force, JIS-A
Based on the impact force of the hammer method (tapping machine) specified in -1418, the compression deformation state of the cushioning mat is made different depending on the difference between the lightweight floor impact force and the heavy floor impact force.

Specifically, the solution means taken by the invention of claim (1) is premised on a soundproof floor structure in which a floor panel is disposed on a floor base material via a cushioning mat, and the upper surface of the cushioning mat and the floor panel are When a floor panel is laid between the lower surface and the cushion mat and the floor panel is interposed with a space being maintained to prevent contact between the two and a heavy floor impact force acts on the floor panel. In addition, a large number of spacer members, which sink into the cushioning mat and contact the two, are provided in a substantially uniformly dispersed manner.

Further, the specific solution means taken by the invention of claim (2) is premised on an underfloor cushioning material arranged between a floor base and a floor panel, and on the upper surface of a cushioning mat having cushioning properties, A plurality of projections that sink into the cushioning mat when a heavy floor impact force acts on the floor panel are provided directly or integrally via a soft sheet material.

The heavy floor impact force referred to in claims (1) and (2) is the impact force of the tire drop method defined in JIS-A-1418.

(Operation) With the configuration of the inventions of claims (1) and (2), when a lightweight floor impact force acts, such as when a person walks on the floor panel, a large number of spacer members (a plurality of protrusions) ) Supports the floor panel from below and prevents contact between the cushioning mat and the floor panel, so that a large number of spacer members (a plurality of protrusions) are subjected to concentrated load, and the spacer members ( The plurality of protrusions) move up and down on the cushion mat by themselves while absorbing the lightweight floor impact force applied to the floor panel, while partially compressing the cushion mat.

In addition, when a heavy floor impact force is applied to the floor panel, such as when a child jumps up and down, a large number of spacer members (a plurality of protrusions) sink into the cushioning mat and the bottom surface of the floor panel and the cushioning mat The floor panel is supported by the entire surface of the cushioning mat as it abuts the upper surface. Therefore, the total shock absorbing force of the cushioning mat functions to absorb the heavy floor impact force applied to the floor panel.

(Example) Hereinafter, the Example of this invention is described based on drawing.

FIG. 1 shows an example of a soundproof floor structure according to the present invention, and shows a sectional structure when used in a wooden two-story or three-story house. A floor panel is laid on the wooden floor set 1A which is the ground 1 with an underfloor cushioning material 2 interposed therebetween, and a finishing material 4 is laid on the upper surface of the floor panel 3.

In the wooden floor set 1A, wooden joists 12 are laid on a wooden floor beam 11 at appropriate intervals, and a base plate 13 made of particle board is arranged on the joists 12.

As shown in FIG. 2, the underfloor cushioning material 2 is a cushioning mat 21.
And a sheet 22 made of rubber or soft plastic disposed on the upper surface of the cushioning mat 21.
A plurality of hemispherical projections 23 are provided dispersedly on the upper surface of 22.

As the material of the buffer mat 21, a mat of synthetic fibers such as nylon, polyester or polypropylene, a mat of inorganic fibers such as glass wool or rock wool, a mat having a cushioning property such as a foamed plastic mat or a mat of soft synthetic resin is used alone or Can be used in combination.

As the sheet 22, a material that bends when a large impact force, that is, a heavy floor impact force acts on the floor panel 3 and the floor panel 3 pushes the protrusions 23 downward, for example, flexibility of a rubber, a soft synthetic resin, or the like. Or a soft material having bendability by providing cut grooves in the longitudinal and lateral directions on one or both sides. The sheet 22 may be integrally laminated with the cushioning mat 21, or may be separately formed and placed on the cushioning mat 21 to intervene.

The sheet 22 is not necessarily provided when the surface of the cushioning mat 21 is a smooth surface, but glass wool,
In the case of a porous low density buffer mat 21 such as synthetic fiber, it is necessary to prevent the projections 23 from being embedded in the voids of the buffer mat 21.

The material of the protrusions 23 may be the same as or different from that of the sheet 22, but it can support the load of the floor panel 3 and furniture placed on it, and the floor panel 3 is subjected to a heavy floor impact force. In this case, a sheet having a hardness enough to sink into the cushioning mat 21 by bending and deforming the sheet 22 is used.

For the size and distribution of the protrusions 23, see the floor panel 3
A heavy floor impact force, for example, an impact force of 3900N, which is capable of sinking into the cushioning mat 21, specifically, a cylindrical or spherical one having a diameter of about 3 to 10 mm. It is preferable that the protrusions are provided at a height of 2 to 5 mm at intervals of 10 cm. That is, with a projection having a diameter of less than 3 mm, the floor panel 3 is sunk into the cushioning mat 21 even with a light weight floor impact force.
It becomes impossible to maintain the space between the cushion mat and
This is because when the diameter is larger than 10 mm, the amount of sinking into the mat is small even if a heavy floor impact force of 3900 N is applied, and the contact between the floor panel and the cushioning mat becomes incomplete. Moreover, the area ratio of the protrusions 23 to the sheet 22 is 0.1 to 10%.
Is preferable, and specifically, the diameter of the protrusion 23 is 3 mm.
Something about 3 to 5 cm pitch is provided and the protrusions 23
It is desirable to keep the area ratio of 1 to 2% so that the light weight floor impact force is evenly dispersed and the cushioning material can be compressed and restored smoothly.

The cushioning mat 21 is provided with a plurality of short cylindrical notches 24 at several places, and rubber legs 25 are attached to the lower surface of the seat 22 inside the notches 24. By doing so, even if a piano, heavy furniture, or the like is placed on the upper surface of the floor finishing material 4, the compressive deformation of the cushioning mat 21 is restricted and the sinking of the floor surface is prevented. The leg 25 is preferably made of rubber having vibration insulation and a hardness of about 45 so that solid propagating sound is not transmitted between the leg 25 and the floor base, and the height of the leg 25 reduces the shock absorbing power of the cushioning mat 21. It is preferable to make it slightly lower than the height of the buffer mat 21 so as not to cause it.

The shape of the projection 23 is not limited to the above-mentioned shape, as long as it is a shape capable of sinking into the cushioning mat 21.
It may be a semi-circular or ridge-shaped protrusion having a mountain-shaped cross section.

Further, although the projections 23 are provided only on the upper surface of the sheet 22 in the above-described embodiment, they may be provided separately on both sides of the sheet 22 as shown in FIG. In this case, the upper and lower protrusions 23
It is preferable to shift the position of because the seat 22 bends smoothly when a heavy floor impact force is applied.

Further, in the above-described embodiment, the projection 23 is provided on the sheet 22, but when the cushioning mat 21 is a foamed plastic mat or the like, the projection 23 is not provided on the cushioning mat 21 without disposing the sheet 22. You may provide directly. Alternatively, the protrusions 23 may be attached to the lower surface side of the floor panel 3 instead of being provided on the cushioning mat 21, and may be interposed between the panel lower surface and the cushioning material.

In the above examples, the floor base 1 was the wooden floor set 1A, but instead of this, a concrete floor slab 1B as shown in FIG. 4 may be used, and as shown in FIG. A steel frame floor structure 1C in which a joist 12 made of C-shaped steel is laid over a floor beam 11 made of H-shaped steel and a base plate 13 is laid thereon may be used.

FIG. 6 shows a case where a lightweight floor impact force acts on the floor panel 3 such as when walking on the floor surface. In this case, since the projection 23 is interposed between the floor panel 3 and the cushioning mat 21 with a space held between them, the projection 23 is in a state of being prevented from completely contacting each other. The lightweight floor impact force is concentrated on the floor cushioning force, and even if the floor impact force is light, the cushioning mat 21 is locally compressed and deformed to absorb the energy of the impact force. It is difficult to get downstairs.

FIG. 7 shows a case where a heavy floor impact force of 3900N acts on the floor panel 3. In this case, since the protrusion 23 sinks into the inside of the cushioning mat 21 while largely deforming the seat 22, the entire upper surface of the cushioning mat 21 receives the weight impact force of the floor panel 3. Therefore, the shock absorbing force of the entire cushioning mat 21 functions, so that the heavy floor impact force is effectively absorbed, and the heavy impact sound is less likely to be transmitted downstairs.

Hereinafter, specific examples and comparative examples, and respective test results will be described.

As a specific example, the following two-story wooden floor structure was prepared.

Underfloor: 45mm x 40mm joist on the floor beam on the upper floor, thickness 12
Laminated mm plywood (the lower floor ceiling is gypsum board finish) Underfloor cushioning material: A 17 mm thick polypropylene fiber mat with a 2 mm high protrusion at an area ratio of 1.5%.

Floor panel: A particle board with a thickness of 15 mm and a plywood with a thickness of 9 mm are stacked and arranged with their joints offset.

Floor finish: 12mm thick plywood floor.

As Comparative Example 1, a 17 mm-thick polypropylene fiber mat with no protrusions is laid as a cushioning material for underfloor on the same floor substrate as in the specific example, and the floor similar to the specific example is laid on it. Panels and floor finishes were applied.

In Comparative Example 2, the floor structure was constructed by applying the plywood floor material on the joists without applying the under-floor cushioning material.

FIG. 8 shows a lightweight impact sound, and FIG. 9 shows a measurement result of a floor impact sound level with respect to a heavy impact sound, which is measured based on JIS-A-1418 and JIS-A-1419. The sound insulation grade for light impact sound is L-59 for the concrete example and L for the comparative example 1.
-62, Comparative Example 2 is L-70, and the sound insulation grade against heavy impact sound is L-65 for the specific example, L-66 for Comparative Example 1, and L- for Comparative Example 2. 70. In both cases of light impact sound and heavy impact sound, the floor impact sound level of the concrete example is lower than that of the comparative example, but the effect is remarkable in the light impact sound. It is considered that this is because even when the light weight floor impact force acts on the floor panel, the projection body locally compresses and deforms the cushioning mat to move largely up and down to absorb the energy of the impact force.

(Effect of the invention) As described above, according to the soundproof floor structure of the invention of claim (1) or the underfloor cushioning material of the invention of claim (2), a floor panel is provided between the cushioning mat and the floor panel. When laying, the space between the cushion mat and the floor panel is interposed to prevent the two from contacting each other, and the heavy floor impact force sinks into the cushion mat when used on the floor panel and both Since a large number of spacer members (a plurality of protrusions) that abut against each other are provided, when a lightweight floor impact force acts on the floor panel, a large number of spacer members (a plurality of protrusions) absorb the shock. The mat is locally compressed and deformed to absorb the lightweight floor impact force applied to the floor panel, and when a heavy floor impact force is applied to the floor panel, the entire cushion mat is compressed and deformed to have the mat. Weight added to floor panel due to full impact absorption Since the floor impact force is absorbed, it is possible to effectively reduce the propagation of both the lightweight impact sound and the heavy impact sound.

[Brief description of drawings]

FIG. 1 is a sectional view of a soundproof floor structure and an underfloor cushioning material according to the present invention, and FIG. 2 is a partially cutaway perspective view of the underfloor cushioning material,
FIG. 3 is a sectional view of a modified example of the underfloor cushioning material, FIGS. 4 and 5 are modified examples of the soundproof floor structure, and FIGS. 6 and 7 are of the soundproof floor structure and underfloor cushioning material. Sectional view showing an example of the operation when a concrete floorboard is used as a base,
FIGS. 9 and 10 are graphs showing the results of floor impact sound level measurement. FIG. 8 shows the case of a lightweight floor impact sound, FIG. 9 shows the case of a heavy floor impact sound, and FIGS. FIG. 11 is a sectional view of a conventional floor structure. 1 ... Floor base, 1A ... Wooden floor set, 1B ... Concrete floor slab, 1C ... Steel floor set, 2 ... Underfloor cushioning material, 3 ... Floor panel, 4 ... Floor finishing material, 11 …… Floor beams, 12 …… Joists,
13 ... Base material, 21 ... Buffer mat, 22 ... Sheet, 23 ...
… Protrusions.

Claims (2)

[Claims] 1. A soundproof floor structure in which a floor panel is disposed on a floor base through a cushioning mat, the floor panel being laid between the upper surface of the cushioning mat and the lower surface of the floor panel. The cushioning mat and the floor panel are interposed in a state where a space is maintained to prevent contact between the cushioning mat and the floor panel. When a heavy floor impact force acts on the floor panel, the sinking mat sinks into the cushioning mat and strikes them. A soundproof floor structure, in which a large number of spacer members to be in contact with each other are provided substantially uniformly dispersed. 2. An underfloor cushioning material disposed between a floor base and a floor panel, wherein when a heavy floor impact force acts on the floor panel on an upper surface of a cushioning cushioning mat. An underfloor cushioning material, characterized in that a plurality of projections that sink into the cushioning mat are integrally provided directly or via a soft sheet material.