JP2001249665A - Sound absorbing material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sound absorbing material and a falsework in common use as the sound absorbing material. SOLUTION: A porous sound absorbing material segment consists of a flat planar molding, such as glass wool, which may be perforated and (b) a plurality of small pieces of glass wool, etc., and includes a cut section from which the surface part of high density is removed. The small pieces (b) are evenly adhered to one flat surface of the flat planar molding or are arranged within the holes of the flat planar molding and are formed with recessed parts for resonance sound absorption. This segment may be combined with a trussed beam structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound absorbing material having a structure for enhancing a sound absorbing effect. Further, the present invention relates to a sound absorbing device and a scaffold in which a sound absorbing material having a structure that enhances a sound absorbing effect is combined with a metal muscular structure such as a truss structure, and a method of manufacturing the same.

[0002]

BACKGROUND ART Glass porous shaped articles, such as wool roll, board-like, longitudinal tubular products with Warime the pipe cover, raw materials (glass) dissolved → fiberizing → piled-up cotton → molding,
It is mass-produced at low cost by the respective manufacturing methods including processes such as drying , and is widely used as a sound absorbing material and a heat insulating material for buildings, vehicles, and outdoors.

[0003] The characteristic of these molded articles is that the surface density is high except for the cut surface due to the molding step, that is, the surface is hard.

On the other hand, a surface material having a concave portion or a through hole has been used for a long time to improve the acoustic effect on a wall surface or a ceiling of a concert hall or the like.

[0005] Further, in addition to i) the sound absorption by the porous material described above as the principle of sound absorption, and ii) the sound absorption by resonating the sound with the air in the recess or through hole provided in the wall or ceiling, and iii) the back surface It is known that sound absorption can be provided by a hole having a thin resonance plate.

Further, Japanese Patent No. 29055781 discloses a sound absorbing device and a scaffold in which a muscle structure (truss structure) and a sound absorbing material are combined.

[0007]

Conventionally, glass wool is most often used for sound absorption by a porous material. However, since the glass wool is subjected to pressure by molding together with an adhesive, the surface of the glass wool is hardened. High density areas are created, which reduces the sound absorbing effect.

Further, although other sound absorbing principles are known as described above, the conventional sound absorbing method has not been made to combine those principles, so that the sound absorbing efficiency is not optimal. .

Further, in the sound absorbing device of Japanese Patent No. 29055781, the sound absorbing material inserted along the longitudinal or horizontal streaks into the muscular structure is cut out, for example, in the case of a triangular prism, because no existing molding exists. Or there was a problem that molding was troublesome. In addition, there is a problem in that the work of inserting into the eyes between the muscles is a laborious work.

[0010]

The applicant has noticed that a large number of cylindrical glass wool moldings are manufactured for heat insulation of pipes, and made a trial production of a combination of this with a flat plate-like porous glass wool material. However, they found that the sound absorption was excellent. In addition, various measures were taken in consideration of the principle of sound absorption. (A) a flat molded body of a porous material such as glass wool or a flat molded body in which holes are uniformly formed;
(B) a porous sound-absorbing material in which a plurality of small pieces of a porous formed body such as glass wool are combined, and the porous sound-absorbing material removes a surface portion of the porous formed body such as glass wool having a high density; The small piece (b) of the porous molded article fragment such as the glass wool is uniformly adhered to one plane of a flat molded article of the porous material such as the glass wool, or It is disposed in a hole evenly formed in a flat molded body of a porous material such as glass wool, or is evenly formed in a flat molded body of a porous material such as glass wool. A part thereof is inserted into the hole, and the porous sound-absorbing material has
An endless groove or part formed by a through hole formed in the small piece and / or a wall surface of the uniformly drilled hole and a wall surface of the small piece (b) disposed in the hole. Resonant sound absorbing cavities are formed by grooves that are not endless even if not connected, and / or cavities formed by the through holes formed in the small pieces (b) and the holes adjacent to the small pieces. One or both surfaces of the porous sound-absorbing material may be covered with a covering material; thereby, a portion of porous glass wool having a high surface density can be removed, and a plurality of the sound-absorbing principles can be used. In order to reduce the reflected sound under elevated roads, etc., it is installed under the girder of elevated roads, etc. ) Parallel interconnected A muscle structure having at least a vertical streak and / or a horizontal streak to form an imaginary plane formed by connecting grids or connecting streaks parallel to each other on the upper surface, and (b) applying from one surface or both surfaces of the muscle structure A plate-shaped porous sound-absorbing material formed from a plate-shaped porous sound-absorbing material fixed thereto, or (a) the muscular structure and (b) the plate-shaped porous sound-absorbing material; The plate-shaped porous sound-absorbing material (b), which is composed of a plate-shaped structure formed from a bottom plate having a large number of holes on the entire surface and fixed to the lower surface of the muscle structure, A combination of a) a flat molded product of a porous material such as glass wool or a plate-shaped molded product in which holes are uniformly formed, and (b) a plurality of small pieces of a porous molded product fragment such as glass wool. And the porous sound absorbing material (b) is made of a porous material such as glass wool. A small piece (b) of a piece of a porous molded body such as glass wool, which includes a cut surface from which a high-density surface portion of the form has been removed, is one piece of a flat molded body of a porous material such as glass wool. It is evenly adhered to a flat surface, or is disposed in a hole evenly formed in a flat molded body of a porous material such as the glass wool, or is a flat plate of a porous material such as the glass wool And a part thereof is inserted into a hole evenly formed in the molded article, and the porous sound-absorbing material (b) has a through-hole formed in the small piece and / or a hole uniformly formed in the small piece. Endless grooves formed by the wall surfaces of the holes and the wall surfaces of the small pieces (b) disposed in the holes, or grooves that are nearly endless even if not partially connected, and / or the small pieces (b) Open to A cavity formed by the through hole and the hole adjacent to the small piece forms a cavity for resonance sound absorption, and one or both surfaces of the porous sound absorbing material (b) may be covered with the covering material. A flat molded body of a porous material such as glass wool or a small piece of a porous molded body fragment such as glass wool or the like (b) from one plane obtained by uniformly drilling holes in the flat molded body (a) Is projected, the muscle structure is arranged such that the projection is located in the grid formed by the vertical and / or horizontal stripes on the side to which it is applied and fixed or between the parallel stripes. A sound absorbing device characterized by arranging the porous sound absorbing material (b) with respect to the body (a); thereby eliminating the work of inserting the composite of the muscle structure and the sound absorbing material into the muscle structure. They discovered that they could be easily made and completed the present invention. This will be described below with reference to the drawings.

[0011]

Embodiment 1 FIG. 1 is a perspective view showing an example of the structure of a sound absorbing material according to the present invention. This structure is made by punching a large number of holes in a plate-shaped molded body 1 of a porous sound absorbing material, and inserting a cylindrical piece 2 into the opened hole so as to protrude from the surface of the molded body 1. The cylindrical section has a central hole 3. FIG. 2 shows a cross section around one of the cylindrical pieces 2. As shown in FIG.
A cylindrical piece 2 having a central hole 3 and a cylindrical piece 2
Projecting from the surface of the molding 1 creates a void adjacent to the cylindrical piece 2 on the opposite surface of the molding 1. This void communicating with the outside through the central hole 3 produces a sound absorbing effect by resonance in a specific wavelength range.

In order to manufacture the structure shown in FIG. 1, a cylindrical piece 2 formed by punching is inserted into the opened hole, or a tubular molded body for heat insulation of a pipe is cut to an appropriate length. The resulting cylindrical piece 2 is inserted. In the former case, mass production is easy with an automated device (not shown) having a combination of a cutter having concentric blades and a protruding punch. In the latter case, it is possible to obtain a frontal cut surface different from the former. In the latter method, an automated manufacturing apparatus that alternately performs embedding and cutting can be considered. In any case, the sound absorbing material shown in FIG. 1 can be manufactured only by inserting without using an adhesive.

Embodiment 2 FIG. 3 is a perspective view showing another example of the sound absorbing material structure of the present invention. This structure is made by punching a large number of holes 12 in a plate-shaped molded body 11 of a porous sound absorbing material, and inserting a cylindrical piece 13 having a diameter smaller than the diameter of the hole into the hole 12 thus formed. A coating material such as a polyester nonwoven fabric or a glass cloth or a coating material such as a non-porous thin plate is applied to both sides of the plate-shaped molded body 11 made of a porous sound absorbing material, so that the cylindrical pieces 13 are held in the holes 12. You. The void created between the perimeter of the hole 12 and the fragment 13 and the void in the central hole 14 of the fragment 13 provide a sound absorbing effect by resonance.

As in the first embodiment, the fragment 13 may be a fragment generated when the hole 12 is punched, or may be a cut glass tubular wool for heat insulation of a pipe. In either case, insertion into the hole can be performed more easily. FIG. 4 is a sectional view showing the vicinity of one of the holes 12.

Embodiment 3 FIG. 5 is a perspective view showing still another example of the structure of the sound absorbing material of the present invention. In the case of this specific example, the sound-absorbing material is manufactured by arranging and adhering, in a concentric manner, cut pieces 21, 22, and 23 of tubular molded bodies having different thicknesses on the surface of the flat molded body 24. This sound absorbing material has grooves 25 and 26 of different radii,
Since the protruding portion is large, the sound absorbing effect is high.

Embodiment 4 FIG. 6 shows a sound-absorbing material having the same structure as that of Embodiment 1 of the second patent.
It is a top view which shows the example combined with the truss-like muscular structure used for a scaffold and a sound-absorbing material described in No. 905781. The sound absorbing material with the protruding portion directed downward so that, for example, one or two pieces of the glass wool molded body fit in each of the squares on the upper surface formed by the vertical stripes 32 and the horizontal stripes 33 of the truss-like muscle structure 31. 34 (FIGS. 7, 8,
10), the sound absorbing material 34 can be easily arranged inside the truss-like muscle structure. As a result, Patent No. 29
The work of inserting a glass wool molded body along the vertical or horizontal streaks of the truss structure, which was required in No. 05781, can be eliminated, and a sound absorbing material is arranged inside the truss structure to reduce waste of space. I can do it. The same sound absorbing material 34 is applied to and fixed to both the upper and lower surfaces of the truss-like muscular structure 31, so that the truss-like muscular structure 31 is formed.
It is also possible to produce a scaffolding / sound absorbing material that occupies a larger portion of the space formed by the porous material (not shown).

Embodiment 5 On the surface opposite to the protrusion of the sound absorbing material shown in FIGS.
A thin film such as an aluminum plate was stuck. The back surface of the hole was closed by this thin film, and an effect of absorbing sound wave energy by resonance of sound wave with air in the hole was obtained. At the same time, the sound wave energy was absorbed by the vibration of the attached aluminum plate, and a sound absorbing effect was obtained.

FIG. 9 shows a comparison of the sound absorbing efficiencies of the sound absorbing materials of Examples 1 to 3 with respect to the same mass of the sound absorbing materials of Examples 1 to 3 and the sound absorbing material having a structure in which only a hole is formed. It is a line graph showing an experimental result. In the case of the sound-absorbing material of Example 2, although there are portions where the result is worse than that of the flat plate depending on the frequency band, the sound-absorbing material shows a good sound absorption coefficient as a whole.

[0019]

【The invention's effect】

B) The glass wool molded body from which the high-density hard portions are removed gives a higher sound absorption coefficient of the porous type. B) In addition to porous type sound absorption, resonance type sound absorption by holes, and / or
Alternatively, sound absorption by the diaphragm is combined. C) The surface shape becomes complicated, and a diffused sound reflection effect can be obtained. D) Since the existing glass wool tube for heat insulation of a pipe can be cut into pieces, the manufacturing cost is low. E) More efficient sound absorption can be achieved by using a thin glass wool molded body. F) When combined with a truss-like muscular structure, the protrusions can be easily arranged in the squares, so that it can be used for sound absorption under a highway or the like as in Japanese Patent No. 2990581.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a sound absorbing material structure of the present invention.

FIG. 2 is a cross-sectional view around one hole in FIG. 1;

FIG. 3 is a perspective view showing another example of the sound absorbing material structure of the present invention.

FIG. 4 is a sectional view around one hole in FIG. 3;

FIG. 5 is a perspective view showing still another example of the structure of the sound absorbing material of the present invention.

FIG. 6 is a plan view showing an example of a scaffolding / sound absorbing device in which a sound absorbing material having a structure similar to that of the first embodiment is combined with a truss-like muscle structure used in the scaffolding / sound absorbing device described in Japanese Patent No. 2990581; FIG.

FIG. 7 is a sectional view of the scaffolding / sound absorbing device of FIG. 6;

FIG. 8 is an enlarged sectional view of FIG. 7;

FIG. 9 is a line graph showing an experimental result in which the sound absorbing materials of Examples 1 to 3 and the sound absorbing material having a flat plate structure are compared in terms of a reverberation room sound absorption coefficient per unit mass.

FIG. 10 is an enlarged plan view of a scaffold / sound absorbing device similar to that of FIG. 6, but an example in which a sound absorbing material portion includes two protrusions per cell.

FIG. 11 is a sectional view of FIG. 10;

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2D001 AA05 BA01 CA01 CB02 CD03 2E001 DF04 FA30 FA71 GA12 GA17 GA22 GA26 GA51 HA31 HB04 HF15 LA09 MA01 MA04 5D061 AA12 AA22 BB02

Claims (7)

[Claims] (A) a flat molded body of a porous material such as glass wool or a flat molded body in which holes are uniformly formed; and (b) a small piece of a porous molded body fragment such as glass wool. A porous sound-absorbing material comprising a combination of a plurality of porous sound-absorbing materials, wherein the porous sound-absorbing material includes a cut surface from which a high-density surface portion of a porous molded body such as glass wool is removed; The small piece (b) of the molded article fragment is
Either the glass wool or the like is uniformly bonded to one plane of a flat molded body of a porous material, or is disposed in a hole evenly formed in the flat molded body of a porous material such as the glass wool. Or a part thereof is inserted into a hole evenly formed in a flat molded body of a porous material such as glass wool or the like, and the porous sound absorbing material is cut into the small pieces. Through holes,
And / or an endless groove formed by the wall surfaces of the uniformly drilled holes and the wall surfaces of the small pieces disposed in the holes, or a groove that is almost endless even if not partially connected, and / or With the through hole formed in the small piece and the void formed by the hole adjacent to the small piece,
A sound absorbing material having a cavity for resonance sound absorption, wherein one or both surfaces of the porous sound absorbing material may be covered with a coating material. 2. To reduce reflected sound under an elevated road or the like, mounted under a girder of an elevated road or the like, the sound absorbing device comprises: (a) parallel vertical streaks and / or A muscle structure having at least a horizontal streak and having a virtual plane formed by connecting grids or parallel streaks on the upper surface, and (b) applied to and fixed to one or both surfaces of the muscle structure Or a muscular structure of (a) above, a porous sound absorbing material of (b) above, and (c) a lower surface of the muscular structure A plate-shaped structure formed from a bottom plate having a large number of holes on the entire surface thereof fixed to the substrate, and a plate-shaped porous sound absorbing material (b) applied from the top surface is composed of: (a) glass wool, etc. Holes were evenly formed in a flat molded body or a flat molded body of porous material And (b) a plurality of small pieces of a porous molded article such as glass wool, wherein the porous sound-absorbing material (b) has a high density surface of the porous molded article such as glass wool. And a small piece (b) of a porous molded article fragment such as glass wool,
Either the glass wool or the like is uniformly bonded to one plane of a flat molded body of a porous material, or is disposed in a hole evenly formed in the flat molded body of a porous material such as the glass wool. Or a part thereof is inserted into a hole evenly formed in a flat molded body of a porous material such as glass wool, and the small piece is inserted into the porous sound absorbing material (b). And / or an endless groove or part of the wall surface of the uniformly drilled hole and the wall surface of the small piece (b) disposed in the hole. At least a groove close to endless and / or a through hole formed in the small piece (b) and a cavity formed by the hole adjacent to the small piece form a resonance sound absorbing cavity. Porous sound absorbing material ( ) May be covered with a coating material on one side or both sides, and a flat molded body of a porous material such as the glass wool or a flat molded body in which holes are uniformly formed from one plane (a). When the small piece (b) of the porous molded article piece such as the glass wool protrudes, the protruding portion is formed by the vertical streak and / or the horizontal streak formed on the side to which the piece is applied and fixed. A sound-absorbing device, wherein the porous sound-absorbing material (b) is arranged with respect to the muscle structure (a) so as to be located inside or between parallel muscles. 3. A sound absorbing device mounted below a girder on an elevated road or the like in order to reduce reflected sound below an elevated road or the like. A plurality of rows of web bars connecting zigzag in a zigzag manner, at the upper and lower vertical streaks or at the intersection of the vertical streaks and the web streaks, a muscle structure formed by joining with horizontal streaks, (B) a plate-shaped porous sound-absorbing material applied to and fixed to one or both surfaces of the muscle structure, or the muscle structure of (a) and the plate of (b) And a plate-like structure formed from a porous sound-absorbing material, and (c) a bottom plate having a large number of holes on the entire surface fixed to the lower surface of the muscular structure, and applied from one or both surfaces. The plate-shaped porous sound-absorbing material (b) comprises: (a) a flat molded product or a flat plate of a porous material such as glass wool; The porous sound absorbing material (b) is composed of a combination of a body in which holes are uniformly formed, and (b) a plurality of small pieces of a porous molded body such as glass wool. A cut surface from which a high-density surface portion of the molded body has been removed; and a small piece (b) of a porous molded body fragment such as glass wool,
Either the glass wool or the like is uniformly bonded to one plane of a flat molded body of a porous material, or is disposed in a hole evenly formed in the flat molded body of a porous material such as the glass wool. Or a part thereof is inserted into a hole evenly formed in a flat molded body of a porous material such as glass wool, and the porous sound absorbing material (b) includes An endless groove or part of the wall formed by the drilled through hole and / or the uniformly drilled hole and the wall of the small piece (b) disposed in the hole. A groove formed near the endless and / or a through hole formed in the small piece (b) and a space formed by the hole adjacent to the small piece form a cavity for resonance sound absorption; Quality sound absorbing material (b One or both surfaces may be covered with a coating material, and a flat molded body made of a porous material such as glass wool or a flat molded body in which holes are evenly formed (a). When a small piece (b) of a porous molded article piece such as glass wool projects, the projecting portion is located in the square formed by the vertical streak and the horizontal streak on the side to which the piece is applied and fixed. A sound absorbing device, wherein the porous sound absorbing material (b) is disposed with respect to the muscle structure (a). 4. After using a plurality of the sound absorbing devices according to claim 2 as a temporary scaffold under an elevated road or the like, fixing the sound absorbing device so as to form a plane below a girder of an elevated road or the like having a different height from the temporary scaffold. A method of preventing noise under elevated roads. 5. A fixed or suspended installation at a position suitable for repair work under a girder such as an elevated road.
Or a sound absorbing device and a scaffold using the sound absorbing device according to 3. 6. A sound-absorbing device and a temporary scaffold, wherein a plurality of the sound-absorbing devices according to claim 2 or 3 are suspended under an elevated road or the like. 7. The sound-absorbing material according to claim 1, wherein the plate-shaped formed body having evenly perforated holes, and a covering material or resonance provided on a flat surface of the formed body in which small pieces of the formed body fragments do not protrude. A sound-absorbing material comprising a plate.