JP2005030197A - Sound insulation wall and method of increasing sound insulation performance of the wall - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sound insulation wall capable of providing excellent sound insulation properties without increasing height and weight and a method of increasing the sound insulation performance of the sound insulation wall. <P>SOLUTION: This sound insulation wall 1 comprises a plurality of sound insulation panels 4 fixed to a panel support material 3 fixedly installed across columns 2. A vibration damping material 5 is stuck on the generally entire surfaces of the sound insulation panels 4 so as to close clearances G between the sound insulation panels 4 adjacent to each other. The vibration damping material 5 comprises a vibration damping sheet formed of an organic high polymer material with a loss tangent (Tanδ) peak value of 1.5 or higher and a constraining member installed on the outer surface of the sheet and having a Young's modulus of 1 GPa or higher. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a soundproof wall and a method for improving the soundproof performance thereof, and more particularly, to a soundproof wall suitable for a railway and a method for improving the soundproof performance thereof.

Conventionally, when installing a noise barrier for railways, as described in “Calculation of sound attenuation due to dredging” (Pollution prevention technology and regulations, P.94 issued by the Association of Industrial Environment Management), dredging transmission loss (30 dB to 50 dB) ) Is 10 dB larger than the wraparound attenuation (limit value 25 dB), it is said that there is no effect of improving the performance of the soundproof wall. For a soundproof wall having a sound insulation performance that satisfies this condition, the performance is further improved. Was not considered. For example, the soundproofing performance has been improved by increasing the height of the soundproofing wall or by installing a sound absorbing mechanism at the top as described in Patent Document 1.
JP-A-9-264010

  In the conventional soundproof wall, when the height of the soundproof wall is increased, there is a problem that visibility of the driver and passengers is deteriorated and the scenery is also deteriorated. In addition to the above problems, the burden on the structural materials such as support columns increases and the life of the structural materials decreases, and reinforcement work is required for countermeasures to this, and the weight increases accordingly. There was a problem. In particular, the problem of weight increase is a major problem with soundproof walls in elevated sections.

  An object of the present invention is to provide a soundproof wall and a soundproof performance improving method for the soundproof wall that can provide good soundproofing characteristics without increasing the height and weight in view of the above-described problems of the prior art.

  The soundproof wall according to claim 1 is a soundproof wall in which a plurality of soundproof panels are provided so as to be adjacent to each other via a slight gap, and the vibration damping material is attached to the soundproof panel so as to close the gap between the adjacent soundproof panels. It is characterized by being pasted together.

  The soundproof wall according to claim 2 is a soundproof wall comprising a plurality of soundproof panels fixed to a panel support member secured between columns, and the vibration damping material is soundproof so as to sandwich the panel support member from above and below. It is characterized by being bonded to a panel.

  A soundproof wall according to a third aspect is the soundproof wall according to the second aspect, wherein a damping material is bonded to the soundproof panel so as to close a gap between adjacent soundproof panels.

  The soundproof wall according to claim 4 is the soundproof wall according to any one of claims 1 to 3, wherein the damping material has a peak value of a loss tangent (Tanδ: hereinafter simply referred to as “Tanδ”) of 1. It is characterized by comprising a vibration damping sheet made of an organic polymer material of .5 or more and a restraining member provided on the outer surface of the sheet and having a longitudinal elastic modulus of 1 GPa or more. Here, Tan δ is a value measured at 100 Hz.

  The soundproof performance improving method for a soundproof wall according to claim 5 is a method for improving the soundproof performance of a soundproof wall provided such that a plurality of soundproof panels are adjacent to each other with a slight gap between the soundproof panels. A vibration damping material is bonded to the soundproof panel so as to close the gap.

  A soundproof performance improving method for a soundproof wall according to claim 6 is a method for improving the soundproof performance of a soundproof wall including a plurality of soundproof panels fixed to a panel support member secured between columns. The vibration damping material is bonded to the soundproof panel so as to sandwich the material from above and below.

  The soundproof performance improving method of the soundproof wall according to claim 7 is the soundproof performance improving method of the soundproof wall according to claim 6, wherein the vibration damping material is further bonded to the soundproof panel so as to close a gap between adjacent soundproof panels. It is a feature.

  The soundproof performance improving method for a soundproof wall according to claim 8 is the soundproof performance improving method for a soundproof wall according to any one of claims 5 to 7, wherein the damping material has a peak value of loss tangent (Tanδ) of 1. It is characterized by comprising a vibration damping sheet made of an organic polymer material of 5 or more and a restraining member provided on the outer surface of the sheet and having a longitudinal elastic modulus of 1 GPa or more.

  In the soundproofing wall according to claim 1 and the soundproofing performance improving method of the soundproofing wall according to claim 5, the vibration damping material may be bonded to the outer wall surface of the soundproof panel, or may be bonded to the inner wall surface of the soundproof panel. You may affix on both surfaces of a panel. The vibration damping material may be bonded to the entire surface of the soundproof panel or may be partially bonded. In the case of being partially bonded, it is preferable that the panels are bonded to the abutting portion between the panels and the portion adjacent to the panel support material between the panels. Although it does not specifically limit as a damping material, As shown below, it is preferable to set it as the laminated body which consists of a damping sheet and a restraint member.

  In the soundproof wall according to claim 2 and the soundproof performance improving method of the soundproof wall according to claim 6, the damping material may be bonded to the outer wall surface of the soundproof panel, or may be bonded to the inner wall surface of the soundproof panel. You may affix on both surfaces of a panel.

  In the soundproofing wall according to claim 3 and the soundproofing performance improving method of the soundproofing wall according to claim 7, when there is a gap in the butt portion of the panel, the gap is preferably filled with a damping material, silicon, lead tape or the like. . A vibration damping material comprising a laminate of the vibration damping sheet and the restraining member shown below is superior in workability compared to silicon, superior in durability compared to lead tape, and is also excellent as a material for filling gaps.

  In the soundproof wall according to claim 4 and the soundproof performance improving method of the soundproof wall according to claim 8, the organic polymer material for the vibration damping sheet has a loss tangent (Tanδ) peak value of 1.5 or more. Although not particularly limited, a polymer material having a polar group is preferred. Examples of such polymer materials include chloroprene rubber, acrylonitrile-butadiene rubber, fluorine rubber, ethylene-vinyl acetate copolymer, polyvinyl butyral, chlorosulfonated polyethylene, chlorinated polyethylene, vinyl chloride resin, chlorinated chloride. Examples include vinyl resins, vinylidene chloride resins, vinyl chloride-vinylidene chloride copolymers, halogenated polymers, fluorine polymers, bromine polymers, polyurethane thermoplastic elastomers, polyester thermoplastic elastomers, and polyamide thermoplastic elastomers. It is done.

  A plasticizer may be added to the organic polymer material as necessary. In particular, when the organic polymer material is too hard, it is preferable to add a plasticizer. As the plasticizer, those usually used for vinyl chloride resins can be used. For example, phthalic acid plasticizers such as dioctyl phthalate, diethyl phthalate, diisononyl phthalate, and di-2-ethylhexyl tetrabromophthalate A phosphate ester plasticizer such as tricresin phosphate and tris (1,3-dicyclo-2-propyl) phosphate; a trimellitic ester plasticizer such as tri-2-ethylhexyl trimellitate; an epoxy plasticizer; Examples include polyester plasticizers. Vegetable oil-based plasticizers are also preferred. In order to suppress bleed-out of chlorinated paraffin, a phthalic acid plasticizer is preferable. These may be used alone or in combination of two or more. When a plasticizer other than the phthalic acid plasticizer is used, it is preferably used in combination with the phthalic acid plasticizer.

  The compounding amount of the plasticizer is 50 to 200 parts by weight, preferably 60 to 180 parts by weight, and more preferably 100 parts by weight or less with respect to 100 parts by weight of the organic polymer material. Bleed-out can be suppressed within this range, and a vibration control effect can be exhibited.

  A filler may be added to the organic polymer material as necessary. In particular, when it is desired to impart a certain degree of hardness to the resin composition, it is preferable to add a filler. As filler, metal powder such as iron powder, aluminum powder, copper powder; mica, kaolin, montmorillonite, silica, calcium carbonate, aluminum hydroxide, magnesium hydroxide, magnesium phosphate, crystalline carbon (graphite, etc.), vermiculite Examples thereof include inorganic fillers. These may be used alone or in combination of two or more. When the amount of the filler is too large, the vibration damping property of the resin composition is lowered. Therefore, the amount is preferably 300 parts by weight or less with respect to 100 parts by weight of the organic polymer material.

  The method for producing a vibration damping sheet made of an organic polymer material is not particularly limited, and may be a general sheet molding method such as an extrusion molding method, a calendar molding method, a solvent casting method, or the like. The obtained sheet is cut into a required size and used for the construction of a soundproof wall.

  The restraining member, which is another component of the vibration damping material in the soundproof wall according to claim 4 and the soundproof performance improving method of the soundproof wall according to claim 8, is not particularly limited as long as the longitudinal elastic modulus is 1 GPa or more. A material having a larger longitudinal elastic modulus than the organic polymer material for the vibration damping sheet is preferable.

  Examples of such restraining members include lead, iron, steel (including stainless steel), aluminum and other metal materials; concrete, gypsum board, marble, slate plate, sand plate, glass and other inorganic materials; polycarbonate, polysulfone, etc. Bisphenol A-modified resins; acrylic resins such as poly (meth) acrylate; chlorinated resins such as vinyl chloride resins and chlorinated vinyl chloride resins; rubber materials such as acrylonitrile-butadiene-styrene rubber; polyethylene terephthalate; Saturated polyesters such as polyethylene naphthalate; Styrene resins; Olefin resins such as polyethylene and polypropylene; Polyamide resins such as nylon 6, nylon 66, and aramid (aromatic polyamide); Melamine resins; Polyimide resins; Urethane resins Dicyclopenta Wood, cellulosic materials such as paper; ene, thermosetting resin Bakelite like chitin, include sheet or sheets made of chitosan.

  These may be used alone or in combination of two or more. The restraining member may be reinforced with glass fiber, carbon fiber, liquid crystal or the like, may be a composite plate made of different materials, or may be a foam made of these materials.

  In the case of a metal restraining member, it is preferable to apply plating or painting because it is used outdoors. More preferable examples of the restraining member include stainless steel, painted steel plate, and galvanized steel plate.

  The shape of the restraining member is not particularly limited, and may be a sheet shape, a plate shape, a rod shape, a block shape, or the like. A sheet-like restraining member is preferably used. Since the constraining member made of a smooth metal plate has a tendency to increase the reflectivity, it is preferable to reduce the reflectivity by providing irregularities on the surface, opening holes, or using the constraining member as an inorganic material. The hole diameter is preferably about 3 to 20 mm so that the hole is not blocked by dirt or the like. Even if the restraining member vibrates, if the longitudinal elastic modulus of the restraining member does not decrease so much, the soundproofing effect tends to increase due to surface irregularities or perforations.

  The thickness of the vibration damping sheet and the restraining member may be arbitrary, but if it is too thin, the vibration damping performance is inferior. If it is too thick, the weight increases and the workability deteriorates, so the thickness of the vibration damping sheet is preferably 100 μm to 10 mm. The thickness of the restraining member is preferably 50 μm to 10 mm. In the case of a hard restraining member having a longitudinal elastic modulus of 100 GPa or more, the thickness is preferably 50 μm to 2 mm.

  The organic polymer material includes, for example, a chlorine-based polymer material having a chlorine content of 20 to 70% by weight and at least one chlorinated paraffin having 10 to 50 carbon atoms and a chlorine content of 30 to 70% by weight. A chlorinated polymer material having a chlorine content of 20 to 70% by weight, a first chlorinated paraffin having 12 to 16 carbon atoms and a chlorine content of 30 to 70% by weight; A resin composition comprising a mixture of second chlorinated paraffins having 20 to 50 carbon atoms and a chlorine content of 30 to 70% by weight (provided that the proportion of the first chlorinated paraffins is 40% by weight or more in the total chlorinated paraffins); May be.

  Examples of the chlorine-based polymer material include vinyl chloride resins, vinylidene chloride resins, vinyl chloride-vinylidene chloride copolymers, chlorinated polyethylene resins, chlorinated vinyl chloride resins, and the like.

  If the chlorine content of the chlorinated polymer material is too small, the vibration damping property is lowered, and if it is too large, the vibration damping sheet becomes too hard and molding becomes difficult, so 20 to 70% by weight is preferable.

  The chlorinated paraffin is not limited as long as it has 10 to 50 carbon atoms and a chlorine content of 30 to 70% by weight, and it may be liquid or solid. The chlorinated paraffin may consist of a single substance or a mixture of two or more substances. One type of chlorinated paraffin may be used alone, or two or more types may be used in combination.

  If the carbon number of the chlorinated paraffin is too small, the chlorinated paraffin will bleed out, and if it is too large, sufficient vibration damping properties will not be exhibited, so it is preferably 12-50, and one type of chlorinated paraffin is used. When it is done, it is preferably 12-20, more preferably 12-16.

  If the chlorine content of the chlorinated paraffin is too small, sufficient vibration damping properties will not be exhibited, and the chlorinated paraffin may not be compatible with the chlorinated polymer material and may bleed out. Again, chlorinated paraffin is not compatible with the chlorinated polymer material and may bleed out, so the content is preferably 30 to 70% by weight. The closer the chlorine content of the chlorinated paraffin is to the chlorine content of the chlorinated polymer material, the better the vibration damping, so if you decide the chlorine content of the chlorinated paraffin according to the chlorine content of the chlorinated polymer material Good.

  If the amount of the chlorinated paraffin relative to the chlorinated polymer material is too small, sufficient vibration damping properties cannot be obtained, and if it is too large, the strength becomes small and the resin composition is difficult to maintain the form. 100 to 400 parts by weight is preferable with respect to 100 parts by weight of the material.

  The mixture of chlorinated paraffins is a first chlorinated paraffin having 12 to 16 carbon atoms and a chlorine content of 30 to 70% by weight and a second chlorinated paraffin having 20 to 50 carbon atoms and a chlorine content of 30 to 70% by weight. Consists of Thus, by using two kinds of chlorinated paraffins having different carbon numbers, the peak value of loss tangent (Tan δ) can be further increased, and excellent vibration damping can be obtained.

  In this case, if the ratio of the first chlorinated paraffin is 40% by weight or more in the total chlorinated paraffin, the peak value of loss tangent (Tan δ) can be further increased and maintained over a long period of time, and chlorination can be achieved. This is preferable because bleeding out of the vibration damping sheet of paraffin can be suppressed.

  If the amount of the chlorinated paraffin mixture relative to the chlorinated polymer material is too small, sufficient vibration damping properties cannot be obtained, and if it is too large, the strength decreases and the resin composition becomes difficult to maintain its form. The amount is preferably 50 to 300 parts by weight with respect to 100 parts by weight of the molecular material.

  The vibration damping sheet has a thickness of 0 with a resin blend of 200 parts by weight of chlorinated paraffin having a chlorine content of 50% by weight and 150 parts by weight of chlorinated paraffin having a chlorine content of 70% with respect to 100 parts by weight of chlorinated polyethylene. The restraining member is, for example, a stainless steel plate having a thickness of 0.2 mm.

  Note that the vibration damping material according to claims 1 to 3 and the vibration damping material according to claims 5 to 7 may be non-restraining type vibration damping materials in which the restraining members are not overlapped.

  Non-restrained vibration damping materials include butyl rubber, isoprene rubber, chloroprene rubber, styrene-butadiene rubber, natural rubber, ethylene-propylene rubber, nitrile rubber, acrylic rubber, urethane rubber, silicon rubber, fluorine rubber, acrylonitrile-butadiene Rubber, ethylene-acrylic rubber, polybutadiene rubber, polyacrylate, polycarbonate, polyester, polyetherimide, polysulfone, polyethylene, polypropylene, polyurethane, polyvinyl chloride, chlorinated polyethylene, polyvinyl acetate, ethylene-vinyl acetate copolymer, polystyrene , Urethane thermoplastic elastomers, styrene thermoplastic elastomers, polyester thermoplastic elastomers, vinyl chloride elastomers and mixtures thereof, asphalt viscoelasticity Body and the like.

  The method for producing the soundproof wall according to the present invention may be arbitrary, but in order to improve the workability, a vibration damping sheet and a restraining member are bonded in advance to produce a vibration damping material, which is then soundproofed. It is better to stick the panel with the damping sheet inside. You may install the damping material which consists of a damping sheet and a restraint member in a multilayer form.

  The resin composition containing chlorinated paraffin has appropriate adhesiveness, and has good workability when a vibration damping sheet is bonded to a soundproof panel. Of course, the damping material may be fixed using bolts or rivets.

  About the joint position of damping material, it may not be located in the joint part of soundproof panels, and may be located in the joint part of soundproof panels. In the former case, the ends of the two damping materials may be butted or overlapped. In the latter case, the ends of the two damping members are positioned so that the end of one damping member is aligned with the end of the soundproofing panel or is located in the gap between the soundproofing panels, and the end of the other damping member Is superimposed on the end of one damping material. In this way, when the variation in the gap between the soundproof panels due to the influence of the outside air temperature is large, the variation can be absorbed by the overlapping portion, so that the damping material is not peeled off.

  In addition, when installing the damping material, it is preferable to perform waterproofing on the damping material attaching surface of the soundproof panel before the damping material is attached. If it does in this way, the vaporization of the water | moisture content contained in the inside of a sound-insulation panel will be prevented, and it will be prevented that the generated gas from the inside of a sound-insulation panel raises a damping material.

  Waterproof coatings used for waterproofing include water-based coating waterproofing materials (hydrated solidified coating waterproofing materials, inorganic / organic composite coating waterproofing materials) made of water-soluble polymer compounds and cementitious coagulants, silicone -Penetration type waterproofing materials mainly composed of silicon compounds or resins, acrylic paints, epoxy paints, urethane paints, combinations of these paints and undercoat sealers, and the like.

  In addition, as a method for applying the waterproof paint, there are spray painting, roller painting, ultra spray painting, brush painting, and the like.

(Function)
According to the soundproof wall according to the first aspect of the invention and the soundproof performance improving method of the soundproof wall according to the fifth aspect of the present invention, the gap between adjacent soundproof panels is closed by the damping material, so that the sound transmitted by gap leakage is reduced. be able to. In this case, if the vibration damping sheet is bonded to almost the entire surface of the soundproof panel including the gap, the transmitted sound and the collision sound can be reduced, and the soundproof performance can be further improved.

  According to the soundproof wall according to the invention of claim 2 and the soundproof performance improving method of the soundproof wall according to the invention of claim 6, the vibration control material is provided in the part adjacent to the panel support material, so that the wind pressure when passing through the vehicle The amount of collision sound emission caused by the collision between the soundproof panel and the panel support member is reduced.

  According to the soundproof wall according to the invention of claim 3 and the soundproof performance improving method of the soundproof wall according to the invention of claim 7, the soundproof wall according to the invention of claim 2 and the soundproof performance improving method of the soundproof wall according to the invention of claim 6 are claimed. The soundproof wall according to the invention of claim 1 and the soundproof performance improving method of the soundproof wall according to the invention of claim 5 are added, and the sound transmitted by the gap leakage is reduced, and the soundproof panel and the soundproof panel by the wind pressure when passing through the vehicle. It is possible to reduce radiation of a collision sound generated when the panel support material collides.

  According to the soundproof wall according to the invention of claim 4 and the soundproof performance improving method of the soundproof wall according to the invention of claim 8, the damping material is made of an organic polymer material having a peak value of loss tangent (Tanδ) of 1.5 or more. And a restraining member provided on the outer surface of the sheet and having a longitudinal elastic modulus of 1 GPa or more. Therefore, the workability is easy and the damping performance is excellent. The vibration sheet absorbs vibration and collision sound, and high soundproof performance can be obtained with certainty.

  Further, the organic polymer material includes a chlorine-based polymer material having a chlorine content of 20 to 70% by weight and at least one chlorinated paraffin having 10 to 50 carbon atoms and a chlorine content of 30 to 70% by weight. By using the resin composition, a soundproof wall having even better soundproofing performance can be obtained.

  Furthermore, as an organic polymer material, a chlorine-based polymer material having a chlorine content of 20 to 70% by weight, a first chlorinated paraffin having a carbon number of 12 to 16 and a chlorine content of 30 to 70% by weight, and a carbon number of 20 to By using a resin composition comprising a mixture of second chlorinated paraffins having a chlorine content of 30 to 70% by weight (provided that the proportion of the first chlorinated paraffins is 40% by weight or more in the total chlorinated paraffins), The peak value of loss tangent (Tanδ) can be further increased and maintained for a long period of time, and bleeding out of the chlorinated paraffin from the vibration damping sheet can be suppressed.

  When the resin composition contains chlorinated paraffin, it has moderate tackiness, and when the vibration damping sheet is bonded to the soundproof panel at the target location, no adhesive or double-sided tape is required and workability is good.

According to the soundproofing wall according to the invention of claim 1 and the soundproofing performance improving method of the soundproofing wall according to the invention of claim 5, it is possible to reduce the sound transmitted by the gap leakage, so that the height of the soundproofing wall is kept the same as before. Soundproof performance can be improved.
According to the soundproof wall according to the invention of claim 2 and the soundproof performance improving method of the soundproof wall according to the invention of claim 6, it is possible to reduce the amount of collision sound radiation that has not been considered in the past. The soundproof performance can be improved by keeping the same as the conventional one.

  According to the soundproof wall according to the invention of claim 3 and the soundproof performance improving method of the soundproof wall according to the invention of claim 7, the sound transmitted by the gap leakage and the emission of the impact sound caused by the collision between the soundproof panel and the panel support material are reduced. Therefore, the soundproofing performance can be further improved.

  According to the soundproof wall according to the invention of claim 4 and the soundproof performance improving method of the soundproof wall according to the invention of claim 8, the workability is easy and the vibration damping sheet having excellent vibration damping performance produces vibration and collision noise. Absorbing and high soundproof performance can be obtained with certainty. Therefore, the soundproofing performance can be improved without increasing the height of the existing soundproofing wall.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 and 2 show a first embodiment of a soundproof wall and a soundproof performance improving method according to the present invention. The soundproof wall (1) is made of a plurality of H-shaped steels fixed to the ground at predetermined intervals. The vertical column (2) and the horizontal panel support (3) made of the upper, middle, and lower three-stage square pipes secured between the columns (2) are arranged adjacent to each other with a slight gap. Damping material (5) bonded to the soundproof panel (4) so as to block the gap (G) between the multiple vertical soundproof panels made of flexible board (4) and the adjacent soundproof panel (4) And.

  The size of one soundproof panel (4) is 1 m in width and 2 m in height, and the interval between the columns (2) is 2 m. The soundproof panel (4) is arranged so that the butted part is located at a distance of about 0.5m from the support column, and the upper, middle, and lower panels are supported by bolts and nuts (6) provided in the horizontal direction at predetermined intervals. It is fixed to the material (3). The gap (G) between adjacent soundproof panels (4) is preferably zero from the viewpoint of sound insulation performance, but is about 2 to 3 mm.

  The damping material (5) is a laminated body composed of a damping sheet (7) and a restraining member (8). As shown in FIG. 2, the restraining member (8) is on the outer surface side, and the soundproof panel (4) It is pasted on almost the entire surface. Here, the vibration damping material (5) is not bonded to the portion of the soundproof panel (4) that is fixed to the panel support material (3).

  FIG. 3 shows a second embodiment of the soundproof wall and the soundproof performance improving method according to the present invention, and the bonding area of the damping material (5) is different from that of the first embodiment. That is, in this embodiment, the damping material (5) is bonded to the soundproof panel (4) so as to sandwich the panel support material (3) from above and below. The gap (G) between adjacent soundproof panels (4) to which the vibration damping material (5) is not attached is closed with an appropriate sealing material.

  FIGS. 5 (a) and 5 (b) show a study on how to improve sound transmission in the sound barrier (1). There are five types of sound observed outside the noise barrier (1): A: direct sound, B: wraparound sound, C: transmitted sound, D: gap leak sound, E: emission of collision sound. For A and B, it is necessary to increase the height of the soundproof wall (1), and this measure is not implemented in the present invention. The transmitted sound of C can be improved by 3 dB or more by bonding the damping material to the soundproof panel (4). In addition, with regard to the gap leak sound of D, if the soundproof panel is 1 m x 2 m, the sound insulation performance will be insufficient unless the gap is 1/3 mm or less, but it is impossible to obtain such a gap in actual construction. is there. Therefore, the sound insulation performance is improved by bonding the damping material to the sound insulation panel (4) so as to close the gap. In addition, since the abutting part between the soundproof panels (4) is an open end, it is prone to vibration, and by attaching a damping material to this end, that is, the gap, vibration at the end can be suppressed, A reduction effect of 4 dB or more can be obtained at the acceleration level. In addition, with respect to the impact sound of E, the soundproof wall (1) itself shakes greatly when passing through the vehicle, so that the panel support material (3) and the soundproof panel (4) collide, and this vibration hits the soundproof wall (1). Propagated and emitted. Therefore, by adhering the damping material to the soundproof panel (4) so as to sandwich the panel support member (3) from above and below, it is possible to reduce propagation and obtain an effect of reducing the vibration acceleration level by 6 dB or more. .

  In each of the above embodiments, the vibration damping material (5) is pasted on the existing soundproof wall (1) later. In this case, as shown in FIG. 4, the lower damping material (5A), the middle damping material (5B), the upper damping material (5C It is preferable that the soundproof panel (4) is bonded to the soundproofing panel (4) in a slightly overlapping order. Further, it is preferable to seal the upper end portion of the damping material (5C) to be bonded to the uppermost layer with silicon (S) so that rainwater does not enter the inner surface of the bonding portion.

  The present invention will be described in more detail based on examples.

Example 1
100 parts by weight of chlorinated polyethylene (made by Showa Denko KK, trade name “Elaslene 402NA”, chlorine content 40% by weight) and chlorinated paraffin (made by Asahi Denka Co., product number “E500”, chlorine content 50% by weight, average carbon Number 14, carbon number 12-16 = 99% by weight) 200 parts by weight and chlorinated paraffin (manufactured by Ajinomoto Fine Techno Co., Ltd., trade name “Empara 70”, chlorine content 70% by weight, average carbon number 26, carbon number 20- 50 = 99 wt%) and 100 parts by weight were kneaded with a roll kneader, and the resulting resin kneaded product was pressed at 120 ° C. to obtain a vibration damping sheet (7) having a thickness of 1.0 mm. The Tan δ of the resin kneaded product was 3.5. Then, a damping plate (5) was produced by sticking a 0.2 mm iron plate (8) (elastic modulus was 250 GPa) as a restraining member to the damping sheet (7). However, pasting was performed without an adhesive. This damping material (5) was bonded to the entire surface of the sound insulation panel (4) (excluding the panel support member (3) portion and the column (2) portion) over a section of the actual Shinkansen soundproof wall (1) 100 m. At the time of bonding, the soundproof panel (4) was wiped with a waste cloth, and after applying an epoxy-based surface treatment agent (sealer), the vibration damping material (5) was bonded. The soundproof panel (4) was a tough board t = 15 mm made by Nozawa and 3 × 8 size.

Comparative Example 1
The Shinkansen soundproof wall in which the damping material is not bonded to the soundproof panel is referred to as Comparative Example 1.

Performance Evaluation Test For Example 1 and Comparative Example 1 above, the noise level was measured at the same place and at the same time (different dates) according to the method of Environment Agency Notification No. 78. The value obtained by subtracting the noise level of 1, that is, the effect of the present invention is shown in Table 1.

  From this result, it can be seen that the noise level can be reduced by about 1 dB without increasing the height of the soundproof wall.

  In addition, when the damping material (5) is constructed, the damping material attaching surface of the soundproof panel (4) may be waterproofed before the damping material (5) is attached. When the soundproof panel (4) is made of, for example, an inorganic material, the water absorption is high, and therefore water is contained inside the soundproof panel (4). There is a concern that the damping material (5) may be lifted by the generated gas. Therefore, by applying waterproofing, the moisture contained in the soundproof panel (4) is prevented from evaporating and the generated gas from the soundproof panel (4) is prevented from floating up the damping material (5). The

  Also, regarding the joint position between the vibration damping materials (5), the joint position may not be located at the joint portion between the soundproof panels (4), but is located at the joint portion between the soundproof panels (4). It may be. An installation example in the latter case is shown in FIG.

  In the figure, the two left and right damping materials (5a) and (5b) are positioned so that the right end of the left damping material (5a) is positioned within the gap (G) of the soundproof panel (4). The left end portion of the vibration member (5b) is superimposed on the right end portion of the left vibration damping material (5a). The bolt and nut (6) is provided near the end of the soundproof panel (4) so as to sandwich the overlapping portion (J) of the damping materials (5a) and (5b).

  In this type of soundproof wall (1), the amount of the gap (G) between the soundproof panels (4) varies depending on the outside air temperature due to heat shrinkage of the metal panel support (3). In this case, if one damping material (5) is in close contact with both of the two soundproofing panels (4), it cannot cope with the change in the gap (G) and the damping material (5) is soundproofing. There is a concern that the panel (4) may be lifted or the joint between the damping materials (5) may be peeled off. Therefore, as shown in FIG. 6, the damping material (5a) (5b) is divided at the joint portion of the gap (G) = the soundproofing panel (4), so that the soundproofing panel (4) due to the influence of the outside air temperature is separated. The fluctuation when the fluctuation of the gap (G) is large can be absorbed by the overlapping portion (J), and the vibration damping materials (5a) and (5b) are prevented from peeling off.

FIG. 1 is a front view showing an embodiment of a soundproof wall according to the present invention. FIG. 2 is a vertical sectional view of the same. FIG. 3 is a front view showing another embodiment of the soundproof wall according to the present invention. FIG. 4 is a vertical sectional view showing a preferred embodiment of the method for improving the soundproof performance of the soundproof wall according to the present invention. FIG. 5 is a diagram for explaining the operation of the soundproof wall and the soundproof performance improving method for the soundproof wall according to the present invention. FIG. 6 is a perspective view showing one specific example of the construction of the soundproof wall according to the present invention.

Explanation of symbols

(1): Sound barrier
(2): Prop
(3): Panel support material
(4): Soundproof panel
(5): Damping material
(7): Vibration control sheet
(8): Restraint member

Claims (8)

A soundproof wall in which a plurality of soundproof panels are provided adjacent to each other via a slight gap, wherein a damping material is bonded to the soundproof panel so as to close a gap between adjacent soundproof panels. Sound barrier. In a soundproof wall having a plurality of soundproofing panels fixed to a panel supporter secured between the columns, the damping material is attached to the soundproofing panel so that the panel supporter is sandwiched from above and below. A soundproof wall that is characteristic. The soundproof wall according to claim 2, wherein a damping material is bonded to the soundproof panel so as to close a gap between adjacent soundproof panels. The damping material includes a damping sheet made of an organic polymer material having a loss tangent (Tanδ) peak value of 1.5 or more, and a restraining member provided on the outer surface of the sheet and having a longitudinal elastic modulus of 1 GPa or more. The soundproof wall according to any one of claims 1 to 3, wherein A method for improving the soundproofing performance of a soundproofing wall in which multiple soundproofing panels are placed adjacent to each other with a slight gap, and a damping material is pasted on the soundproofing panel so as to close the gap between adjacent soundproofing panels. A method for improving the soundproofing performance of a soundproofing wall, characterized by combining them. A method for improving the soundproofing performance of a soundproofing wall comprising a plurality of soundproofing panels fixed to a panel supporter secured between columns, wherein the soundproofing panel is arranged so that the panel supporter is sandwiched from above and below. A method for improving the soundproofing performance of a soundproofing wall, characterized in that the soundproofing wall is bonded together. The method for improving the soundproof performance of a soundproof wall according to claim 6, wherein a vibration damping material is further bonded to the soundproof panel so as to close a gap between adjacent soundproof panels. The damping material includes a damping sheet made of an organic polymer material having a loss tangent (Tanδ) peak value of 1.5 or more, and a restraining member provided on the outer surface of the sheet and having a longitudinal elastic modulus of 1 GPa or more. The soundproof performance improving method for a soundproof wall according to any one of claims 5 to 7, characterized in that

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