JPH0546422B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an improvement in a floating floor structure in medium-to-high-rise residential buildings, etc., which reduces the transmission of floor impact noise to the lower floors.

(Prior art and its problems) Floor impact sound includes floor impact sound caused by a light impact force such as that generated when a person walks (lightweight floor impact sound)
and floor impact sound (heavy floor impact sound) caused by a large impact force, such as when a child jumps off a chair. Among these floor impact sounds, light floor impact noise can be easily absorbed and prevented from being emitted downstairs by using a flexible fibrous floor covering material such as carpet. However, the latter weight floor impact sound is
Due to the large impact force (effective impact force of a heavy floor impact sound generator specified in JIS-A1418 is 3875N) such as when a child jumps from a chair, the surface floor finishing material cannot absorb the impact force and the concrete floor The impact force acts on the slab with almost no relaxation, causing the floor slab to vibrate, and this vibration of the floor slab results in the emission of impact sound to the downstairs. It was extremely difficult.

On the other hand, as a method of reducing the transmission of floor impact force to the floor slab, it is known to create a floating floor structure in which a cushioning material such as glass wool mat is placed on the floor slab and a floor panel is constructed on top of the cushioning material. There are two types of floating floor structures: one in which a floor panel is placed directly on top of the cushioning material and the floor finishing material is applied, and the other is in which a support such as a joist is placed on top of the cushioning material and then the floor panel is placed on top of the cushioning material. Some have floor finishing materials installed. However, in the former case where the floor panel was directly placed, the impact force of the heavy floor caused the floor panel to bend and deform, compressing the cushioning material locally, so the effect of cushioning the impact force was small. . In addition, according to the latter structure, the impact force is dispersed by supports such as joists and transmitted to the buffer material, which weakens the impact force that acts directly on the concrete floor slab. Because of this, the floor panel is prone to bending deformation, and during this bending deformation, the air below the floor panel is momentarily compressed, and the air pressure of the compressed air is repeatedly applied to the bottom surface of the floor panel and the top surface of the cushioning material. As a result, the vibration of the floor panel becomes large, and as a result, the vibration of the floor surface is added to the vibration of the floor slab, and it is emitted as an impact sound downstairs. There was a problem that the sound insulation performance could not be obtained as expected.

In addition, in recent years, wooden flooring materials have been increasingly used for the floors of mid-to-high-rise residences due to their ease of maintenance and design. There is a problem that the generated sound is loud, and there is a desire to develop a floor structure that transmits less impact sound even if such a wooden floor finishing material is used.

(Object of the Invention) The present invention has been made in view of the above-mentioned problems of the conventional floating floor structure, and prevents an increase in air pressure on the lower surface of the panel material in the floating floor, reduces vibration of the panel material itself, and A floating floor that reduces the compressed air pressure acting on the cushioning material underneath and the floor subfloor, eliminating the harmful effects of compressed air, and absorbing the radiated sound generated by the vibration of the floor subfloor with the panel material to reduce transmission to the downstairs. It provides structure.

(Means for Achieving the Object) Specifically, the present invention provides a structure in which a cushioning material is provided above the floor subfloor, and a plurality of panel materials are placed above the cushioning material between the lower surface of the panel material and the subfloor surface. In a floating floor structure in which the panels are placed side by side with an air layer of an appropriate thickness, the panel material is made of a porous panel material with air permeability in which the air space on the front and back surfaces of the panel is connected internally,
A suitable floor finishing material is disposed on the upper surface of the porous panel material with air passages interposed therebetween, and when an impact force acts on the floor surface, the air in the air layer on the lower surface of the porous panel material is removed. This floating floor structure is characterized by allowing air to flow through the interior and into the passageway on the underside of the floor covering material.

(Embodiment) Fig. 1 shows an embodiment of the floating floor structure of the present invention, in which a cushioning material 2 made of glass wool mat or the like is placed over the entire surface of a floor base 1 made of a concrete slab or the like. Thickness 2 on top of this cushioning material 2
A wood wool cement board (50mm
Porous panel materials 4 having a thickness and specific gravity of 0.7) are placed side by side, and the rod-shaped supports 3 form an air layer 5 having a thickness of 2 to 50 mm on the lower surface of the porous panel materials 4.

In the porous panel material 4, as shown in FIG. 4 Sufficient air space for the air on the bottom surface to flow out to the surface side through the inside of the panel material 4
It is preferable to use a material with a vacancy rate of 30% or more and ventilation. If this void ratio is less than 30%, the ventilation inside the panel will be low, compressed air on the bottom surface of the panel material 4 will not be sufficiently dissipated, and the transmission of floor impact sound will increase, so it is set to 30% or more. . As the porous panel material 4, for example, a wood wool cement board with a porosity of 30% or more or a low-density wafer board (wood pieces bonded together with a binder) or the like is used. In the case of wooden wool cement boards, the length of the wooden wool is mainly 4 cm or more, and the weight ratio of wood wool to cement is 4:
Knead at a ratio of 6 to 6, with a specific gravity of 0.4 to 0.9 and a thickness of 30 mm to 50
If the board is made of a plate material of 1.5 mm in diameter, a void ratio of 40 to 60% can be secured, and sufficient ventilation can be maintained without the void being crushed inside the board. Additionally, open-cell hard plastic foam reinforced with glass fibers may be used as long as it has sufficient strength to support the floor surface, but it has enough strength to not be deformed or damaged by floor impact. In this case, it is desirable to combine it with a reinforcing material as appropriate. Further, in order to further improve the air permeability of the porous panel material 4, semi-through holes 4a may be provided on the lower surface of the porous panel material 4, as shown in FIG. Furthermore, the porous panel material 4 may be used by disposing a reinforcing plate 4b having ventilation holes, such as perforated plywood, on one or both sides of the panel material 4, as shown in FIG. 4, in order to supplement bending rigidity. . The porous panel material 4 is provided with a joining step 4c cut out around the top surface thereof, and a strip-like connecting material 9 is provided at the joining step 4c between the adjacent porous panel materials 4, 4. The panel members 4, 4 are joined together by fitting and fixing them from above.

In addition, the air layer 5 can be created by partially disposing the buffer material 2 on the lower surface of the porous panel material 4 to create an air layer 5 between the lower surface of the porous panel material 4 and the upper surface of the flooring 1 such as a concrete slab. It may also be provided by directly intervening.

Further, on the upper surface of the porous panel material 4, a thickness of
A 10 mm joist 6 is fixed by nailing at a pitch of 450 mm, and a wooden floor finishing material 7 is placed on the top surface of the joist 6, and a wooden floor finishing material 7 is placed between the bottom surface of the porous panel material 4 and the bottom surface of the floor finishing material 7. An air passage 8 with a thickness of 10 mm is formed. Therefore, the air layer 5 on the lower surface side of the porous panel material 4 and the air passage 8 on the upper surface side of the porous panel material 4
and the hollow portions 6a, 6 of the porous panel material 4.
b, 6a, and when the air in the air layer 5 below the porous panel material 4 is subjected to compressive force, it flows out through the inside of the panel material 4 to the air passage 8 on the lower surface of the floor finishing material 7. It is configured as follows.

Note that here, joists 6 are arranged at appropriate intervals on the upper surface of the porous panel material 4, and an air passage 8 is formed by the space between the joists 4. The material 8 may be made of a breathable sheet such as felt, or may be made of a material with ventilation grooves formed on the lower surface of the floor covering material 7. In addition, if the floor finishing material 7 is a wooden floor material,
As shown in FIG. 2, ventilation holes 10 penetrating the top and bottom of the wooden flooring material may be provided to allow the air in the air passages 8 to flow out to the floor surface.

(Function) As described above, a cushioning material 2 such as glass wool mat is arranged on a floor substratum 1 made of a concrete slab or the like, and on top of the cushioning material 2, a plurality of panel materials are arranged between the lower surface of the panel material and the upper surface of the subfloor. In a floating floor structure in which the panels are placed in parallel with an air layer 5 of an appropriate thickness provided between them, the panel material is made of a porous panel material 4 such as a wood wool cement board having air permeability, and the porous A floor finishing material 7 is appropriately arranged on the upper surface of the panel material 4 with an air passage 8 formed by a spacer or the like interposed therebetween, and when the air in the air layer on the lower surface of the porous panel material 4 acts on the floor surface, the panel Since it is configured to flow through the inside of the material 4 to the air passage 8 on the lower surface of the floor covering material 7, when a weight end impact force acts on the surface of the floor covering material 7, the cushioning effect of the cushioning material 2 causes the porous The porous panel material 4 sinks or bends and deforms, compressing the air below, but this compressed air flows through the inside of the porous panel material 4 to the top surface of the panel, and this air flows to the bottom surface of the floor finishing material 7. It is diffused into the air passage 8.

Therefore, the porous panel material 4 is not subjected to the reaction force due to the compression and expansion of the air layer 5 below the panel material 4, and the vibration of the panel material 4 itself is reduced.
Furthermore, the air pressure acting on the floor substrate 1 such as a concrete slab and the cushioning material 2 is also reduced, and the floor impact noise emitted from the floor substrate 1 is reduced.

Further, the porous panel material 4 absorbs the sound emitted from the floor finishing material 7 and the drainage noise of the underfloor piping, thereby reducing the transmission of noise to the downstairs.

(Specific example) Specifically, 50 mm of 64 kg/m ³ glass wool mat is placed on a 150 mm thick concrete floor slab, 10 mm thick rod-shaped supports are placed on top of this at 45 mm pitch, and Thickness 50mm, through support
A wood wool cement board (909 mm x 1818 mm) with a specific gravity of 0.72 and an air permeability of 45% was placed on top, and the upper surface of the side edge was joined with a strip board made of 12 mm thick plywood using bolts. 4mm thick on wood wool cement board.
A floating floor (example) was constructed by arranging thin plate-shaped joists with a width of 30 mm at a pitch of 45 mm, and constructing a wooden floor material on the joists.

As a result of applying a heavy floor impact force according to JIS-A1418 to this floating floor structure and measuring the impact sound level of the floor impact sound below the floor, we obtained a sound insulation performance of L _H -47 according to the Japanese Architectural Academy standard, as shown in Figure 5. Ta.

On the other hand, as a comparative example, a floating floor was constructed under the same conditions as in the previous example except that two sheets of non-air permeable plywood with a thickness of 12 mm were used in place of the wood wool cement board. When we measured the floor impact sound by applying a heavy floor impact force to this floating floor structure, the measurement result of the impact sound level of the floor impact sound in the lower floor was the performance of L _H -58 of the Japanese Architectural Academy standard. The sound was at a worrisome level, and the performance was not much different from the impact sound level L _H -63 of the weight floor impact force of a bare slab without any floor finishing material or cushioning material.

(Effects of the Invention) As explained above, according to the floating floor structure of the present invention, when a heavy floor impact force acts, the air below the panel material is compressed by compressive deformation of the cushioning material and bending deformation of the panel material. When this happens, the compressed air passes through the inside of the porous panel material and flows out to the top surface of the panel board, and this air is released into the air passage between the top surface of the porous panel material of the flooring material and flows below the panel material. This prevents the air pressure from increasing, reduces the vibration of the panel material itself, reduces the vibration of the finishing material above it, and overall reduces the transmission of vibration to the subfloor, such as the concrete floor slab, located below the cushioning material. This reduces floor impact noise to the downstairs.

In addition, since the above panel material is made of a porous material that has air permeability, the panel material itself has sound absorbing properties, and absorbs the sound emitted from the floor finishing material and prevents the sound emitted from air propagating downstairs. It also has excellent sound absorption properties for reducing the impact sound of lightweight floors such as those caused by walking.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the present invention; FIG. 1 is a sectional view showing a floating bed structure of one embodiment, FIG. 2 is an enlarged view of the main part of FIG. 1, and FIGS. FIG. 5 is a partial sectional view showing a modification of the quality panel material, and is a diagram showing the measurement results of heavy floor impact sound. 1... Floor base, 2... Cushioning material, 3... Support,
4... Porous panel material, 5... Air layer, 6... Joist material, 7... Floor finishing material, 8... Air passage.

Claims (1)

[Scope of Claims] 1. A cushioning material is provided on the floor subfloor, and a plurality of panel materials are lined up on top of the cushioning material with an air layer of an appropriate thickness provided between the lower surface of the panel material and the surface of the subfloor. In the floating floor structure installed, the panel material is made of a porous panel material with air permeability in which air spaces on the front and back surfaces of the panel are internally connected, and an air passage is interposed on the upper surface of the porous panel material. A floor finishing material is appropriately arranged to allow the air in the air layer on the bottom surface of the porous panel material to flow out through the inside of the porous panel material into the air passageway on the bottom surface of the floor finishing material when a buffering force acts on the floor surface. A floating floor structure characterized by the following. 2. The floating floor structure according to claim 1, wherein the porous panel material is a wood wool cement board with a specific gravity of 0.4 to 0.9.