JPH0470463A - Dry floating floor structure - Google Patents

Abstract

PURPOSE:To provide the above dry floating floor structure by laminating a lower part reference floor of a vibro-isolating steel plate-made deck plate and a fiber property heat insulating material of glass wool or the like on the reference floor to form a cushion layer and laminating a surface material of a floating floor layer on the cushion layer. CONSTITUTION:A lower part reference floor is formed by fixing a compound vibro-isolating steel plate-made deck plate 2, interposed between two steel plates with a viscoelastic substance of rubber, plastic, etc. serving as a core, to an upper part of an H-shape steel beam 1 of the foundation of a floor structure. Next, a fire resistant board 3 is connected to upper and lower surfaces of the deck plate 2 by concurrently using an adhesive agent and a machine screw, and two sheets of plywoods 4 are similarly connected in order to integrally form a part between panels on the floor panel. Glass wool 5 is laid decreasing area ratio on the lower part reference floor to form a cushion layer, and three sheets of plywoods are integrally laid as a surface material 6 on the cushion layer. In this way, the construction period can be shortened while lightening the weight and saving the labor.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a dry floating floor structure that provides good livability in a steel frame prefabricated house or a wooden house and has an excellent effect of reducing floor impact noise.

[Prior Art] Floor structures of various buildings, such as steel-frame prefabricated houses or wooden houses, are required to have soundproofing properties that prevent noise emitted from the floor from being transmitted downstairs and reduce the level of vibration noise.

The vibration sound of the floor is called the floor IS sound, and the floor impact sound is also called the weight? #Sound and light weight? Divided into #Sound. Of these, the weight? # Reducing the impact sound is particularly difficult, and in order to reduce it, - numerically increase the bending rigidity and mass per unit area of the floor structure itself, increase the effective countermeasures against the impact force, and It is necessary to suppress the vibration of the floor as much as possible when military force is applied. For reinforced concrete floor structures, increasing the concrete thickness of the slab may be considered for this purpose, but for general steel prefabricated houses and wooden houses, other methods must be considered.

Therefore, as a floor structure that satisfies this soundproofing performance, the one shown in FIG. 2 or 3 can be mentioned. FIG. 2 is an explanatory diagram of a floor structure often used in conventional steel frame prefabricated houses. That is, the C-beam 8 for height adjustment with the small beam is attached on the H-beam 1 by welding, and the ALC
This is a floor structure in which plates are laid, plates 9 and joint reinforcing bars 10 are inserted into the joints of the ALC plates, mortar 11 is poured into the joints, and adjacent ALC plates 7 are connected.

In addition, there is also a floor structure as shown in Fig. 3. That is, in Figure 'iJ3, a trapezoidal or rectangularly corrugated bending thin steel plate 2 made of a damping steel plate is fixed onto an H-shaped steel beam 1 using self-drilling screws, and a base plate 13 such as plywood is placed on top of the bent thin steel plate 2. This is a floor structure in which the asphalt vibration damping sheet 12 is fixed to the floor with nails, screws, etc.

[Problem to be solved by the invention] However, regarding the conventional floor structure as described above,
It is not possible to obtain the sound insulation performance of floor impact sound of concrete legal benefit as in reinforced concrete floor structure. In particular, the floor structure shown in FIG. 2 has a problem in that when impact is continuously applied to the floor, cracks occur in the mortar portions of the joints, and the sound insulation performance decreases from its initial performance. In addition, since wet materials are used, it is necessary to perform wet methods such as mortaring during construction, which not only takes time and effort, but also
Inevitably, the weight of the floor structure itself had to increase.

In addition, the conventionally known dry structure floor shown in Figure 3 cannot achieve high sound insulation performance, especially in the low frequency range of heavy impact sound, which is a problem in apartment complexes. It was low.

The present invention has been made in view of these points, and an object of the present invention is to provide a dry floating floor structure that can reduce floor impact noise to a concrete level and does not require wet construction such as mortaring on site. This is what I did.

[Means for Solving the Problems] The floor structure of the present invention includes a lower reference floor made of a deck plate, and a buffer layer made of a fibrous heat insulating material such as glass wool or rock wool laminated on the lower reference floor. And the M! [Function] The dry floating bed structure of the present invention has a dry floating bed structure consisting of a floating bed layer made of face material laminated on a shock layer. Since it is composed of , there is no need for a wet process such as mortaring on site, and a lightweight floor structure can be realized, resulting in labor-saving construction. Furthermore, as will be described later, the dry floating floor structure of the present invention has the effect of reducing the floor impact sound level over a wide range of sound, from high frequencies to low frequencies, which has been considered difficult in the past. .

Here, the sound insulation performance of the floating floor structure will be explained.

A floating floor structure consisting of a buffer layer and a floating floor layer will not cause an impact if the force is transmitted from the floating floor layer to the lower reference floor only in the vertical direction and the force transmitted in the lateral direction of the floating floor layer is ignored. ! The corresponding forced displacement parts vibrate in the same phase during the source impact time, and the floating floor structure can be replaced with a simple harmonic spring. Theoretically, the spring constant of a floating floor structure is determined by the spring of the buffer material and the air spring in the buffer material acting in parallel, the bending spring of the floating floor layer, and the lower base! 1! Although the bending springs of the droplets are connected in series, only the spring constant of the N-face material and the spring constant of the air in the cushioning material are considered numerically due to the magnitude relationship of each spring constant. Therefore, when the spring constant of the model is set by paralleling the spring constant of the cushioning material and the spring constant of the air, the natural frequency f of the model is expressed by the following equation. maff.

Further, the vibration transmissibility of a model indicating sound insulation performance is determined by the natural frequency f of the model and the loss coefficient η of the buffer material.

In the dry floating floor structure according to the present invention, the natural frequency f of this vibration model is set to 1/1/2 of the lower limit frequency of 45 Hz in the lower frequency range of the octave band with the center frequency of 63 Hz, which is dominant in determining the weight impact sound level. (Ding (i.e. 31.5H
z) By adjusting the following, it becomes possible to reduce the vibration transmission rate in the low frequency range from the floating bed layer to the lower reference bed to 10 or less. Therefore, the impact force in the low frequency range, such as that caused by a child jumping, applied to the floating floor layer is reflected by the Mi impact layer, making it difficult for it to be transmitted to the lower reference floor, and is effective in reducing floor impact noise.

In addition, with the floor structure of the present invention, the vibration transmissibility in the high frequency range is lower than that in the low frequency range, so floor impact noise can be reduced in all frequency ranges, and both heavy impact noise and lightweight impact noise can be reduced. The reduction effect is also large.

In addition, when a damping steel plate is used in the deck plate of the present invention, the vibration energy is absorbed by the damping steel plate, resulting in
Vibration is damped. In particular, when a composite plate with a core made of a viscoelastic substance and the viscoelastic substance interposed between two steel plates is used as a damping steel plate, the core of the viscoelastic substance efficiently absorbs vibration energy, so vibrations are suppressed. can be effectively attenuated.

Furthermore, if a lower reference floor is formed by combining wooden or cement-based surface materials with adhesive, nails, screws, etc. on the top or upper and lower surfaces of the corrugated deck plate made of damping steel plate or ordinary steel plate, , the bending rigidity is improved and floor impact noise is further reduced compared to the case where the deck plate is made up of a single unit.

Furthermore, if a fireproof board is used as a composite surface material for the upper and lower surfaces, it is possible to form a floor structure that achieves both fire resistance and floor impact sound insulation performance.

[Example] FIG. 1 is a partial cross-sectional view showing an example of the present invention. The dry floating floor structure of this embodiment is commonly used in general residences, etc., where floor impact noises such as children's jumping and other noises are a problem.

In the figure, 1 is an H-shaped steel beam, 2 is a deck plate made of damping steel plate, 3 is a fireproof board that aims to improve the bending rigidity of the lower standard floor and achieve fire resistance, 4 is plywood for integration, and 5 is 1
1? # Glass wool as a layer, 6 a surface material as a floating bed layer.

As shown in Figure 1, the width of the flange of the base of the floor structure is 12
A damping steel deck plate (thickness: 1.8 mm) 2 with a peak height of 75 mm and a peak width of 112 mm was fixed to the top of a 5 mm H-shaped steel beam 1 to serve as a lower reference floor. .

A vibration-damping steel plate is a composite plate with a core made of a viscoelastic material such as rubber, asphalt, or plastic interposed between two steel plates.The core of the viscoelastic material absorbs the vibration energy applied to this composite plate. This has the effect of causing shear deformation, absorbing energy, and effectively damping vibrations. In this example, a corrugated deck plate was made using such a damping steel plate, but a normal steel plate may also be used.

Further, the shape of the waveform may be quite numerical, for example, a repeated trapezoid, and the height thereof may be approximately 2.
The length shall be 5 to 75 mm.

Next, a 35 mm thick fireproof board is bonded to the lower surface of the deck plate, and a 60 m thick fireproof board is bonded to the upper surface using a combination of adhesive and screws. In this embodiment, the fireproof board is made of calcium silicate, but is not limited thereto.

Next, in order to integrate the panels on top of this floor panel,
Two 15 mm thick plywood sheets 4 were joined together using an adhesive and screws.

Furthermore, a layer with a thickness of 2
Glass wool 5 having a thickness of 5 mm and a density of 48 kg/m' was laid at an area ratio of 22% to serve as a buffer layer. (100 mm wide glass wool was laid down at a pitch of 455 mm.) Finally, on the M surface layer made of glass wool 5, a surface material 6 consisting of three 15 mm thick plywood sheets was laid down.

As a result of measuring the sound insulation performance of the floor structure configured as described above, it was found that very good sound insulation performance was obtained.

In particular, the following results were obtained regarding sound insulation characteristics in the low frequency range. That is, assuming that the spring caused by the air inside the glass wool of the M surface layer is released from around the floor, the spring constant of the glass wool is Q, 33X 10' N
It became 10'. In addition, the surface density of the facing material is 25 kg/m
', the natural frequency of the floating bed was 1B, 3Hz. Here, when using glass wool with a loss coefficient η = 0.1,
The vibration transmissibility at 63t4Z was 0.1, and the amount of reduction in sound pressure level was approximately 20 dB, giving extremely good results.

[Effects of the Invention] As described above, the dry floating floor structure of the present invention is composed of dry materials such as the glass wall and the facing material, so there is no need for wet processes such as mortaring on site. , it is possible to realize a lightweight floor structure, saving labor and shortening the construction period.

In addition, by adopting a dry floating floor structure consisting of a buffer layer such as glass wool and a floating floor layer of face material, it is possible to reduce floor impact noise in the low frequency range, which is dominant in determining the sound insulation performance of floor impact noise.

Furthermore, with the deck plate using damping steel plate,
It improves the attenuation performance of the lower standard floor, which is the final source of sound radiation into the royal family, so it is a perfect countermeasure against floor impact noise.
It is also effective in preventing secondary noises such as squeaks.

[Brief explanation of drawings]

Figure 1 is a cross-sectional explanatory view showing one embodiment of a floor structure based on the present invention, and Figures 2 and 3 are explanatory views of conventional floors. In the figure, 1: H-shaped steel beam, 2: damping steel deck plate, 3: fireproof boat, 4 plywood for integration, 5 nigella wool, 6: plywood for floating floor, 7: ALC plate, 8: C-shaped steel ,
9 Nibrate, 10 Joint reinforcement, 11: Mortar, 12
Niasfald damping seam (・, 13: Base plate. Figure 1

Claims (3)

[Claims] (1) A lower reference floor consisting of a single deck plate or a composite of wood-based or cement-based surface materials on the upper surface of the deck plate or the upper and lower surfaces of the deck plate, and glass wool or glass wool laminated on the lower reference floor. A dry floating floor structure comprising a buffer layer made of a fibrous heat insulating material such as rock wool, and a floating floor layer made of a face material laminated on the buffer layer. (2) The dry floating floor structure according to claim 1, wherein the deck plate is made of a damping steel plate. (3) Composite surface materials on the upper and lower surfaces of the deck plate,
The dry floating floor structure according to claim 1, characterized in that it is a fireproof board.