CN211973907U

CN211973907U - Low-frequency sound insulation light wood structure wall and outer wall veneer thereof

Info

Publication number: CN211973907U
Application number: CN202020377759.2U
Authority: CN
Inventors: 吴晓莉; 付海燕; 王正
Original assignee: Nanjing Forestry University
Current assignee: Nanjing Forestry University
Priority date: 2020-03-23
Filing date: 2020-03-23
Publication date: 2020-11-20
Anticipated expiration: 2030-03-23

Abstract

The utility model discloses a light-duty timber structure wall body of low frequency sound insulation and outer wall decorative board thereof, outer wall decorative board including phonon crystal structure, the through-hole has been bored along sound wave vertical incidence direction periodicity on the outer wall decorative board, the through-hole intussuseption is filled with the resonance body to form the decorative board body that has local resonance phonon crystal, the resonance body comprises oscillator and the coating of parcel on the oscillator. The utility model discloses be applied to traditional wooden wall body outer wall decorative board with local resonance phononic crystal, utilize local resonance phononic crystal's low frequency sound insulation characteristics, effectively improve the sound insulation performance of whole light-duty wooden structure wall body.

Description

Low-frequency sound insulation light wood structure wall and outer wall veneer thereof

Technical Field

The utility model relates to a building acoustics field specifically is a light-duty timber structure wall body of low frequency sound insulation and outer wall decorative board thereof.

Background

The wall body is used as a main component of the building envelope, and good sound insulation and sound absorption performance is the key point for ensuring high comfort of the building. The light wood structure building has superiority in the aspects of physical and mechanical properties, but the design of the wall structure emphasizes the consideration of inner wall decoration and outer wall water resistance and heat preservation, and can not give consideration to various factors such as sound insulation, and the like, and the light wood structure building has poor performance in the aspects of sound insulation and sound absorption, particularly low-frequency sound insulation. Currently, isolation of low-frequency noise generally adopts: (1) increasing the areal density and thickness of the solid material; (2) adopts a double-layer sound insulation structure or even a multi-layer light structure. For a wood structure building, the sound insulation performance of a wall is usually improved by changing the materials in the wall, such as reasonably filling porous sound absorption materials, using composite materials with high sound insulation and sound absorption performance, or changing the space between wood keels, specification and size and other methods. However, by these methods and measures, the effect of improving the low-frequency sound insulation performance of the wall is not significant.

A phononic crystal is a periodic artificial acoustic structure with an elastic wave bandgap, and if the frequency of the elastic wave is within the phononic crystal bandgap frequency range, propagation is suppressed. The most direct application of the forbidden band property of elastic waves in the acoustic field is sound insulation. Based on the band gap formation mechanism, phononic crystals are divided into two categories: bragg scattering type and local resonance type. The acoustic wave wavelength corresponding to the central frequency in the band gap of the Bragg scattering type phononic crystal is usually twice of the period size, and for low-frequency acoustic waves, the size of the sound insulation component is equivalent to the acoustic wave wavelength, which inevitably causes the thick and heavy structure; the local resonance type phononic crystal inhibits the propagation of sound waves through resonance absorption of the vibrator, the wavelength corresponding to the central frequency in the band gap of the local resonance type phononic crystal is far larger than the period size, and small-size control over large wavelength can be realized. Therefore, the sound insulation idea of the phononic crystal can be applied to light wood structure buildings and combined with the veneer structure of the outer wall of the traditional wood wall body, so that the sound insulation performance of the building wall body, especially low-frequency noise, is improved.

Disclosure of Invention

The utility model aims to solve the technical problem that the not enough light-duty wood structure wall body and the outer wall decorative board that provide a low frequency sound insulation to above-mentioned prior art, this light-duty wood structure wall body and the outer wall decorative board of low frequency sound insulation are applied to traditional wood wall body outer wall decorative board with local resonance phonon crystal, utilize local resonance phonon crystal's low frequency sound insulation characteristics, effectively improve the sound insulation performance of whole light-duty wood structure wall body.

In order to realize the technical purpose, the utility model discloses the technical scheme who takes does:

the utility model provides an outer wall decorative board of light-duty timber structure wall body of low frequency sound insulation, includes the decorative board body, the through-hole has been bored along the sound wave vertical incidence direction periodicity on the decorative board body, the through-hole intussuseption is filled with the resonance body to form the decorative board body that has local resonance phononic crystal, the resonance body comprises oscillator and the coating of parcel on the oscillator.

As a further improved technical scheme of the utility model, the oscillator adopts metal material.

As a further improved technical proposal of the utility model, the metal material is lead, steel or copper.

As a further improved technical proposal of the utility model, the coating layer is made of viscoelastic material.

As a further improved technical proposal of the utility model, the viscoelastic material is rubber or silica gel.

As a further improved technical scheme of the utility model, the decorative board body adopts ya keli or polypropylene.

In order to achieve the technical purpose, the utility model discloses another technical scheme who takes does:

the utility model provides a light-duty timber structure wall body of low frequency sound insulation, includes outer wall decorative board, gypsum board, heat preservation cotton, shingle nail, waterproof ventilated membrane, SPF wall bone post and shui strip, and a plurality of SPF wall bone post inboards are fixed with the gypsum board, and the outside is fixed with shingle nail, and the wall body cavity intussuseption between gypsum board and shingle nail is equipped with the heat preservation cotton, shingle nail surface has laid waterproof ventilated membrane, and vertical shui strip sets firmly on shingle nail, and the shui strip outside is fixed with the outer wall decorative board.

As the utility model discloses further modified technical scheme still includes flashing board and fly net, in the lower extreme of following the water strip stretched into the recess of the fly net of u type, u type fly net opening up, the flashing board was the form of buckling, including front end, centre and rear end, the front end of flashing board is buckled downwards, and middle level, rear end are upwards buckled, and the rear end of upwards buckling links to each other with the side fascia, the middle part that the bottom all is a little higher than the flashing board of side fascia and fly net.

The utility model has the advantages that: the use of the external wall veneer of the phononic crystal enhances the isolation of the structure to low-frequency sound waves, thereby effectively improving the overall sound insulation performance of the wall; the material of the rest structures of the light wood wall is ensured to be unchanged, and the mechanical property and other physical properties of the wall are not influenced, such as compression resistance bearing capacity, heat preservation and insulation, sound absorption performance and the like; the combination of the external wall veneer with a phononic crystal structure and the external wall veneer structure of the traditional light wood wall provides a new method and idea for improving the acoustic performance of the wall.

Drawings

Fig. 1 is a cross-sectional view of a low frequency sound insulating lightweight wood structural wall.

Fig. 2 is an overall effect diagram of a low-frequency sound insulation light wood structure wall.

Fig. 3 is a disassembly effect diagram of the low-frequency sound insulation light wood structure wall.

Fig. 4 is a diagram of the structure and dimensions of a phononic crystal unit cell.

Fig. 5 is a comparison graph of the sound insulation performance of the common light wood structure wall and the light wood structure wall of the utility model.

In the figure: 1. gypsum board, 2, heat preservation cotton, 3, a wall panel, 4, a waterproof breathable film, 5, a flashing board, 6, a fly net, 7, an SPF wall stud, 8, a water-binding strip, 9, an outer wall veneer, 10 and a phonon crystal unit cell.

Detailed Description

The following further description of embodiments of the present invention is made with reference to the accompanying drawings 1-5:

referring to fig. 1, the most important difference between the optimized wood wall and the traditional light wood wall is the structural optimization of the exterior wall veneer, and the local resonance phononic crystal is combined with the structure of the exterior wall veneer of the wall.

As can be seen in detail by referring to fig. 2, the ordinary exterior wall veneer in the conventional light wood wall body is replaced by the phononic crystal veneer structure, and the rest of the wall body is: gypsum board 1, heat preservation cotton 2, shingle nail 3, waterproof ventilated membrane 4, flashing board 5, fly net 6, SPF wall bone post 7, water flowing strip 8 isotructure and material all do not change, according to conventional material and arrangement order.

A plurality of wall bone posts 7 inboard are fixed with gypsum board 1, and the wallboard 3 is fixed to the outside, and the wall body cavity intussuseption between gypsum board 1 and wallboard 3 is established the heat preservation cotton 2. The outer surface of the wall panel 3 is pasted with a waterproof ventilated membrane 4, and a vertical water guiding strip 8 is fixedly arranged on the wall panel 3. The lower end of the water guiding strip 8 extends into the groove of the u-shaped insect-proof net 6, and the opening of the u-shaped insect-proof net 6 is upward. The flashing board 5 is bent, the front end is bent downwards, the middle is basically horizontal, and the rear end is bent upwards and connected with the wall panel 3. An outer wall veneer 9 is fixed on the outer side of the water guiding strip 8. The lowest ends of the exterior wall veneer 9 and the insect-proof net 6 are slightly higher than the middle part of the flashing 5. Of course, the insect net 6 and the flashing 5 may not be required.

The exterior wall veneer 9 of this embodiment is a local resonance phonon crystal veneer formed by periodically drilling holes in the original veneer along the direction of the sound wave vertical incidence and filling the holes with a resonator made of two materials. The resonator body is composed of a vibrator with high density and a coating layer which is coated on the vibrator and has low elastic modulus. The vibrator is made of metal materials with high density such as lead, steel, copper and the like; the coating layer is made of viscoelastic materials with lower elastic modulus such as rubber and silica gel; the exterior wall veneer is made of acrylic, polypropylene and other materials with certain strength.

The material, shape and size of the oscillator and the material and thickness of the cladding layer can be optimally designed according to the noise reduction target frequency.

Referring to fig. 3 and 4, the exterior wall veneer 9 of the present invention is a local resonance type photonic crystal veneer, and is made of three materials, a is the original veneer material, b is the resonance body cladding material, and b is the resonator material of the resonance body. Each phononic crystal cell 10 (including the transducer, cladding and substrate, the substrate being the veneer) can be viewed as a resonant system consisting of a transducer and a spring, and the natural resonant frequency of the resonant system can be expressed as

，kThe coefficient of stiffness of the clad layer is shown,Mit is the mass of the center vibrator, and it can be seen from this formula that lowering the young's modulus of the cladding layer (i.e., decreasing the spring rate) or increasing the mass of the center vibrator can suppress the propagation of the acoustic wave in the low frequency range.

Fig. 5 is a comparison graph of sound insulation of a common wood wall and an optimized wall, wherein the veneer of the optimized wall adopts a local resonance phononic crystal structure, the size I =0.02m, h =0.015m, R1=0.009m, R2=0.008m of a phononic crystal unit cell 10, and the materials of the base body, the vibrator and the cladding layer respectively adopt polypropylene, metal lead and rubber. As can be seen from figure 5, the utility model discloses wood structure wall body is in 100~275Hz frequency range, and the sound insulation volume is higher 3~10dB than ordinary wood structure wall body, shows the utility model discloses wood structure wall body has good sound insulation effect in the low frequency range.

This embodiment can change and suppress the propagation of acoustic waves in a low frequency range by changing the mass of the vibrator and the elastic modulus of the cladding layer. Tests show that the sound insulation and noise reduction performance of the wall body, particularly the low-frequency sound insulation and noise reduction performance, is effectively improved by utilizing the inhibition effect of the phononic crystal on sound waves.

The protection scope of the present invention includes but is not limited to the above embodiments, the protection scope of the present invention is subject to the claims, and any replacement, deformation, and improvement that can be easily conceived by those skilled in the art made by the present technology all fall into the protection scope of the present invention.

Claims

1. The utility model provides an outer wall decorative board of light-duty timber structure wall body of low frequency sound insulation, includes the decorative board body, its characterized in that: through holes are periodically drilled in the veneer body along the vertical incidence direction of sound waves, and a resonance body is filled in the through holes, so that the veneer body with the local resonance phononic crystal is formed, and the resonance body consists of a vibrator and a coating layer wrapped on the vibrator.

2. The exterior wall veneer of a low-frequency sound-insulation light wood structure wall body according to claim 1, characterized in that: the vibrator is made of metal materials.

3. The exterior wall veneer of a low-frequency sound insulation light wood structure wall body according to claim 2, characterized in that: the metal material is lead, steel or copper.

4. The exterior wall veneer of a low-frequency sound-insulation light wood structure wall body according to claim 1, characterized in that: the coating layer is made of a viscoelastic material.

5. The exterior wall veneer of a low-frequency sound insulation light wood structure wall body according to claim 4, characterized in that: the viscoelastic material is rubber or silica gel.

6. The exterior wall veneer of a low-frequency sound-insulation light wood structure wall body according to claim 1, characterized in that: the veneer body is made of acrylic or polypropylene.

7. The utility model provides a light-duty timber structure wall body of low frequency sound insulation which characterized in that: the heat-insulating wall panel comprises the exterior wall veneer, a gypsum board, heat-insulating cotton, a wall panel, a waterproof breathable film, SPF wall studs and a water-permeable strip according to any one of claims 1 to 6, wherein the gypsum board is fixed on the inner side of the SPF wall studs, the wall panel is fixed on the outer side of the SPF wall studs, the heat-insulating cotton is filled in a wall cavity between the gypsum board and the wall panel, the waterproof breathable film is pasted on the outer surface of the wall panel, the vertical water-permeable strip is fixedly arranged on the wall panel, and the exterior wall veneer is fixed on the outer side of the water-permeable strip.

8. The low frequency sound insulating lightweight wood structural wall of claim 7, wherein: still include flashing board and fly net, in the lower extreme of water bar stretched into the recess of the fly net of u type, the opening of u type fly net up, the flashing board is the form of buckling, including front end, centre and rear end, the front end of flashing board is buckled downwards, middle level, and the rear end is upwards buckled, and the rear end of upwards buckling links to each other with the side fascia, the middle part that the bottommost of side fascia and fly net all is a little higher than the flashing board.