JP2003056170A - Floor structure of building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide floor structure suitable as a floor of the second floor or higher of a house with excellent intercepting performance of floor impact sound. SOLUTION: In this floor structure of a building, a sound insulating structural member is supported to a horizontal framework or a frame built up in rectangular shape by floor beams of the building, without coming in contact with a floor constituent member, and an underfloor storage space is formed between the floor constituent member and the sound insulating structural member.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floor structure of a building, and more particularly to a floor structure suitable for a residential floor of two or more floors. 2. Description of the Related Art In recent years, the number of wooden floors and the number of multi-family homes have increased, and the "House Performance Indication System" has been introduced by the "Housing Quality Assurance Promotion Act". There is a growing need to prevent floor noise downstairs. 2. Description of the Related Art In a wooden house structure, a floor structure is known which reduces a weight impact sound by using lightweight cellular concrete (hereinafter, referred to as ALC) as a floor base material. Further, as disclosed in Japanese Patent Application Laid-Open No. 9-88324, a surface mass of 5 to 20 kg / m ² is provided under a wooden floor.
A composite sound-insulating floor in which the plate-like member is disposed without being fixed to a wooden floor is also known as a conventional technique. However, the aforementioned AL
The floor structure alone using C as the floor base material cannot provide a significant effect on the lightweight impact sound, and often uses a sound-absorbing floor provided with a resin foam or the like at the lower part and having a high cushioning property. This soundproof floor is expensive, and the cushion is effective, so that the user may feel discomfort when walking. [0004] In addition, a composite soundproof floor in which the above-mentioned plate-like body is provided without being fixed to a wooden floor, positions the plate-like body only by being placed on the floor naturally. The shape may deviate from its original position. Also, if you try to increase the distance between the plate and the wooden floor to further improve the sound insulation performance, the installed plate will interfere with the installation of the fire beam that bears the horizontal shear force applied to the horizontal shaft or frame. Become. SUMMARY OF THE INVENTION It is an object of the present invention to provide a floor structure suitable for use as a floor of two or more floors in a residential system, which is excellent in blocking floor impact noise. [0006] The floor structure of the present invention solves many of the above-mentioned problems in the prior art, and is a horizontal shaft or frame assembled by a floor beam of a building in a rectangular shape. To
In a floor structure of a building in which a sound insulating structural material is supported without being in contact with a floor structural material, an underfloor storage is formed between the floor structural material and the sound insulating structural material. It has a floor structure. [0007] The sound-insulating structural material described herein is intended to bear the horizontal shearing force applied to the horizontal frame or the frame and to reduce the floor impact noise. Refers to the face material or panel provided in Examples of the floor component described here include a large panel, a joist, a floor base material, a floor finishing material, or a floor panel combining these. The present invention has a structure in which the sound insulating structural member is supported by the horizontal frame or the frame without contacting the floor constituting material, and the solid-borne sound due to the floor impact sound is reduced, and the sound-absorbing space for the air-borne sound is reduced. And the sound insulation against heavy and light impact sounds is improved. Further, by utilizing the sound absorbing space as a storage space under the floor, plate vibration of the sound insulation structure material is suppressed by the weight of the storage object, and it is possible to attenuate the generation of the air propagation sound that transmits the floor impact sound downstairs. [0009] Further, the floor impact sound is irregularly reflected by the storage object entering the sound absorbing space, so that the sound absorbing power of the sound absorbing space is increased and the floor impact sound is suppressed. Furthermore, a highly demanded storage space in a house can be newly constructed without cutting down the living space. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the floor structure of the present invention will be described below with reference to the drawings. FIG. 1 is a partially cutaway perspective view of one embodiment of the present invention in which a sound insulation structural member 1 is arranged on a floor beam of a wooden frame construction method. If necessary for the structure, a pulling support for the joist 6 is provided on the floor beam 2. FIG. 2 is a partially cutaway perspective view of one embodiment of the present invention in which the sound insulating structural member 1 is arranged in a wooden frame construction method. The sound-insulating structural material 1 used in the present invention comprises a nail
Wood-based panels (plywood,
A laminate having a particle board, a structural panel, a fiber board, and a vegetation as main components is preferable in construction. In order to improve the fire resistance of the floor structure, ceramic panels (ALC, extruded board, wood chip cement board)
It is preferable to use a calcium silicate plate or a volcanic glassy multilayer plate. It is preferable that the sound insulating structural material 1 has a high rigidity so as to bear a horizontal shear force applied to a horizontal frame or a frame of a building. As an example, it is preferable to use a bearing surface material described in No. 1100 of 1981. Since the sound insulating structural member 1 bears the horizontal shear force, the fire struts can be omitted, and the workability can be improved.
Further, in consideration of the load resistance of the underfloor storage, the thickness of the sound insulating structural material 1 preferably has a “thickness / span” ratio of 1/100 or more. Or, at the time of a load required for the living room (for example, at a loading load of 1765 N / m ² ), the sound insulating structural material 1
Has a flexural rigidity such that the maximum deflection is 1/100 or less of the span. In the wooden frame construction method, the installation of the sound insulating structural member 1 on the floor beam is typically performed by using the square member 3a as a base for the sound insulating structural member, as shown in FIG. In FIG. 4, the sound insulation structural material 1
Fig. 5: Sound insulation structural material 1 on joist for sound insulation structural material
There is also a method shown in FIG. 6 in which the sound insulating structure 1 is screwed below the square bar 3a. The square members 3a, the plate members 3b, and the joists 3d for the sound insulating structural material, which are the foundations of the sound insulating structural material 1, are nailed or screwed to the floor beam 2. At this time, an adhesive may be used to enhance the integrity. For the same reason, the sound insulating structural material 1 and its base are also nailed or screwed, but if necessary, an adhesive may be used together. The construction position of the sound insulating structural material 1 is such that the floor beam 2 can be regarded as an inverted T-shaped beam structurally, and the driving point impedance which greatly affects the floor impact sound is increased to promote the improvement of sound insulation. It is desirable that the lower part of the floor beam in the vertical direction is lower than a half position, and in the sense of securing the storage volume,
The lower part is desirable as much as possible. In addition, by increasing the distance between the sound-insulating structure 1 and the floor component such as the floor base material and the floor finishing material, the sound-absorbing space for the air-borne sound is increased and the sound insulation is improved. Since the installation of the sound insulating structural member 1 above the position of the floor beam in the vertical direction is accompanied by a decrease in the driving point impedance and the sound absorbing space, it is difficult to expect a great improvement in the sound insulating property. Further, the volume of the storage space is reduced, which is not practical. In order to simultaneously apply the horizontal shearing force applied to the horizontal frame or the frame to the floor component and the sound insulation structural member 1, it is preferable to install the floor beams above and below the floor beams in terms of structural balance. The sound insulating structural member 1 generates bending vibration due to the floor impact sound of the upper floor material, and the bending vibration generates an air propagation sound and transmits the floor impact sound downstairs. Sound insulation structural material 1
In order to suppress the bending vibration, it is effective to make the structure of the sound insulation structural member 1 a multilayer structure of a heavy layer and a lightweight layer.
Specifically, it is preferable to provide a sheet-like material having a specific gravity of 1.0 or more and 10.0 or less on at least one of the upper surface and the lower surface of the sound insulating structure 1. Placing mortar or concrete on the upper surface of the sound insulating structural member 1 is also effective for suppressing bending vibration. 5 to 5 between sound insulation structural material 1 and floor beam
By providing a mortar or the like in the gap of 0 mm, the horizontal shear force applied to the horizontal frame or frame of the building can be transmitted to the sound insulation structural member 1 more reliably, and the horizontal rigidity of the building itself is raised. It is effective for Next, the results of actual measurements of floor impact noise in the wooden frame construction method according to the present embodiment and other floor structures will be described. <Evaluation method> As an impact sound measurement system, a wooden frame assembly method was used to assemble a wooden frame on a concrete pit 14 having a length of 3.6 m, a width of 2 m and a depth of 1.4 m as shown in FIG. A measurement system for the measurement was adopted. A sound absorbing material 10 is provided on the inner periphery of the concrete pit, and a ceiling 9 is provided below the floor set. A microphone 12 connected to a sound level meter 13 outside the pit is provided in the pit.
Is arranged. The floor structures of Examples and Comparative Examples described later were measured according to “JIS A1418 Method for measuring floor impact sound level at building site”. The weight impact sound was evaluated by the dB value of 63 Hz, which is considered to be the most disadvantageous side, and the lightweight impact sound was evaluated by the A characteristic. [Example 1] The floor beam 2 is 120 mm wide and 240 m high.
m is fixed to the upper part of the concrete pit 14 at intervals of 910 mm, and the lower part of the floor beam is 45 m according to FIG.
An m-square bar 3a is fixed with a screw, and a sound insulating structural material 1 (in this embodiment, a sheet-like material (thickness 10 mm, specific gravity 0.15) in which Kollang stems are formed in parallel in the present embodiment) is mounted on an upper portion of the bar. An adhesive consisting of 50 to 250 g / m ^{2 is} applied, and 7 to 11 sheets of the sheet-like material are laminated on each other to form a surface material on the surface of the plant-stalk laminate.
Are stacked and sent to a hot plate press.
C., press at 8 to 10 × 10 ⁵ Pa for 10 to 20 minutes, and the thickness of the plant stem laminated body and surface material integrated with each other is 30 to 40 m.
m of the laminate was screwed and arranged. In the case of the present embodiment, the “thickness / span” ratio of the sound insulating structural material 1 is １ ／.
It was set to 0-1 / 26. Also, the loading load 1765N /
The maximum deflection of the sound insulating structural material 1 at m ² is about 1 of the span.
/ 400. Further, a sand bag (10 kg) imitating a storage object arranged in a storage room under the floor is placed on the sound insulating structure material by 1 m ^2.
One piece was placed per unit. Above the floor beam, a joist 6 having a width of 45 m
m, the height of 105mm toga materials are arranged at 300mm intervals,
"Composite flooring" specified in Japanese Agricultural Standards "Flooring" as a floor base material 4 by fastening a 12 mm thick ordinary plywood to the joist as a floor base material 4 and setting the floor finish material 5 on the base material
Was placed. In addition, a gypsum board having a thickness of 9.5 mm was placed below the floor beam as the ceiling 9 so as not to contact the floor beam, and a floor structure in a wooden frame construction method was produced. Comparative Example 1 A floor structure was produced in the same manner as in Example 1 except that no sand bag was provided. This example assumes a structure in which no underfloor storage is provided on a wooden floor using a sound-insulating structural material. Comparative Example 2 A floor structure was manufactured in the same manner as in Comparative Example 1 except that no high-shielding panel was provided. This example assumes the most common structure in a conventional wooden floor structure. Table 1 shows the evaluation results of the examples and comparative examples. [Table 1] According to the evaluation results, it is understood that both the heavy impact sound and the light impact sound are effectively reduced by the construction method of forming the underfloor storage on the sound insulating structure according to the present embodiment. Therefore, the floor structure of the present invention provides a floor impact sound (weight / weight).
It is evident that it is very effective in reducing both light weight). As described above, since the floor structure of the present invention has the above-mentioned structure and operation, it has the following great effects. It is a structure in which the sound insulation structural material is supported by the horizontal frame or the frame without contacting the floor component, the solid-borne sound due to the floor impact sound is reduced, the sound-absorbing space for the air-borne sound is increased, and the weight impact sound and Sound insulation against light impact noise is improved. Further, by utilizing the sound absorbing space as a storage space under the floor, plate vibration of the sound insulation structure material is suppressed by the weight of the storage object, and it is possible to attenuate the generation of the air propagation sound that transmits the floor impact sound downstairs. Further, when a storage object enters the sound absorbing space, the floor impact sound is irregularly reflected, so that the sound absorbing power of the sound absorbing space is increased and the floor impact sound is suppressed. Furthermore, a highly demanded storage space in a house can be newly constructed without cutting down the living space.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway perspective view of a floor structure according to an embodiment of the present invention in a wooden frame construction method. FIG. 2 is a partially cutaway perspective view of a floor structure according to an embodiment of the present invention in a wooden frame construction method. FIG. 3 is an enlarged longitudinal sectional view of a main part of the floor structure of FIG. 1,
It is a figure which shows the example which screwed the sound insulation structural member 1 to the square bar 3a. FIG. 4 is an enlarged longitudinal sectional view of a main part of the floor structure of FIG. 1,
It is a figure which shows the example which screwed the sound insulation structure material 1 to the board 3b. 5 is an enlarged longitudinal sectional view of a main part of the floor structure of FIG. 1,
It is a figure which shows the example which fixed the sound insulation structure material 1 to the notch 3c. FIG. 6 is an enlarged longitudinal sectional view of a main part of the floor structure of FIG. 1,
It is a figure which shows the example which fixed the sound insulation structure material 1 to the 3d of the sound insulation structure material joists. 7 is an enlarged longitudinal sectional view of a main part of the floor structure of FIG. 1,
It is a figure which shows the example which screw-fixed the sound insulation structural member 1 under the square bar 3a. FIG. 8 is a schematic diagram of a measurement system used for measuring an impact sound of a floor structure of a building. [Description of Signs] 1 Sound insulation structural material (the upper part is a storage room under the floor) 2 Floor beam 3 Ground 3a for sound insulation structure material Square material 3b Board material 3c Cut 3d Joist for sound insulation structure material 4 Floor base surface material 5 Floor finish material 6 Jolt 7 Screw 8 Nail 9 Ceiling 10 Sound absorbing material 11 Impact sound generator 12 Microphone 13 Sound level meter 14 Concrete pit

Claims (1)

Claims: 1. A floor structure of a building in which a sound insulating structural member is supported without being in contact with a floor component, on a horizontal shaft or frame assembled in a rectangular shape by floor beams of the building. At
A floor structure of a building, wherein an underfloor storage is formed between the floor component and the sound insulating structure.