JP4305240B2 - Sound barrier for railway and method for improving soundproof performance thereof - Google Patents

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 noise barrier for railroads, when the height of the noise barrier is increased, the visibility of the driver and passengers is lowered, and the scenery is also deteriorated. For installations, in addition to the above problems, the burden on the structural materials such as struts will increase, and the lifetime of the structural materials will decrease. There was a problem of increasing. In particular, the problem of weight increase is a major problem with soundproof walls in elevated sections.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object thereof is to provide a railway soundproof wall and a method for improving the soundproof performance of the railway soundproof wall, which can obtain good soundproofing characteristics without increasing the height and weight. To do.

Railroad soundproof walls by claim 1, soundproofing train formed by soundproof panels plurality is secured passes the unstoppable panel support between posts so as to be adjacent via some gap In the wall, the same as the damping sheet made of an organic polymer material having a peak value of loss tangent (Tan δ: a value measured at 100 Hz, hereinafter simply referred to as “Tan δ”) of 1.5 or more. A portion in which a vibration damping material, which is provided on the outer surface of the sheet and is composed of a restraining member having a longitudinal elastic modulus of 1 GPa or more, is fixed to the panel support so as to close a gap between adjacent soundproof panels and it is characterized in that it is combined Ri bonded over substantially the entire acoustic panel except.

Railroad soundproof walls due to the second aspect, a plurality of acoustic panel is slightly through the gap is fixed to the unstoppable panel support passes between posts to be adjacent sound barrier for a railway which is formed by Rukoto The vibration 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 damping material being found together are bonded to the acoustic panel so as to sandwich the panel support member from above and below, the gap between the soundproofing adjacent panel is characterized in that has escaped busy with a sealing material.

Railroad soundproof walls due to Claim 3 resides in that in Claim 1 or 2 railroad noise barriers according, waterproofing the attachment surface damping material soundproof panel is characterized in that it is facilities.

Railroad soundproof walls by claim 4 is the railway noise barriers according to claim 1 or 2, damping material, characterized in that in the gap portion between the adjacent acoustic panel are divided is there.

The soundproof performance improvement method for a railway soundproof wall according to claim 5 is formed by fixing a plurality of soundproof panels to a panel support member that is secured between columns so as to be adjacent to each other through some gaps. A damping sheet made of an organic polymer material having a peak loss loss tangent (Tanδ) of 1.5 or more, which is a method for improving the soundproofing performance without increasing the height of the existing railway soundproofing wall. , Using a damping material provided on the outer surface of the sheet and composed of a restraining member having a longitudinal elastic modulus of 1 GPa or more, and fixed to the panel support so as to close the gap between adjacent soundproof panels it is characterized in that the aligning Ri adhered to substantially the entire surface to the damping material soundproof panels are excluding the portions that are.

Soundproofing performance improvement methods of the railroad soundproof walls by claim 6 is fixed to the unstoppable panel support passes between posts as soundproofing panels plurality are adjacent via some gap is formed by Rukoto A damping sheet made of an organic polymer material having a peak loss loss tangent (Tanδ) of 1.5 or more, which is a method for improving the soundproofing performance without increasing the height of the existing railway soundproofing wall. The vibration damping material provided on the outer surface of the sheet and composed of a restraining member having a longitudinal elastic modulus of 1 GPa or more is used, and the vibration damping material is attached to the soundproof panel so as to sandwich the panel support material from above and below . It is characterized in that it is bonded to the surface on the panel support material side and the gap between adjacent soundproof panels is closed with a sealing material .

In soundproofing performance improvement methods of the railroad soundproof walls by railroad noise barriers and claim 5 by 請 Motomeko 1, damping material may be bonded to the outer wall surface of the acoustic panel, bonding to the inner wall surface of the acoustic panel It may be attached to both sides of the soundproof 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 .
In the soundproof performance improvement method for the railway soundproof wall according to claim 2 and the railway 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. It may also be bonded to both sides of the soundproof panel.

If there is a gap in the abutting portion of the panel, damping material, silicon, or the like lead tape, it is preferable that the gap is filled. 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.

Organic polymeric materials for the damping sheet is not particularly limited as long as the peak value of the loss tangent (Tan?) Of 1.5 or more, but are not limited to, polymeric materials having polar groups are 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 for railways and the soundproofing performance improving method for soundproof walls for each claim, 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 damping materials may be unconstrained damping material restraint member not superimposed.

  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 of manufacturing the noise barrier for railways 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. It is better to stick the soundproof 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 soundproof performance improvement methods of the railroad noise barriers by the inventors of the railroad noise barriers and claim 5 according to the invention of claim 1, since the gap between adjacent acoustic panel is closed by the damping material, transmitted by the clearance leakage Sound can be reduced. 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 for a railway according to the invention of claim 2 and the soundproof performance improving method for the soundproof wall for a railway according to the invention of claim 6, the vehicle is passed by providing a vibration damping material in a portion adjacent to the panel support material. The amount of radiation caused by the collision sound generated when the soundproof panel and the panel support member collide with each other due to the wind pressure is reduced.

The請 railroad noise barriers of the aspect of the invention Motomeko 2 and Oite soundproofing performance improvement methods of the railroad noise barriers according the sixth aspect, the gap between acoustic panel adjacent into how blocked by the damping material Thus, it is possible to reduce the sound transmitted due to the gap leakage and reduce the radiation of the collision sound generated by the collision between the soundproof panel and the panel support member due to the wind pressure when passing through the vehicle.

According to soundproof performance improvement methods of the railroad noise barriers and railroad noise barriers by the inventors of the claims, damping material, an organic polymer material peak value of loss tangent (Tan?) 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 railway 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 soundproof performance improvement methods of the railroad noise barriers by the inventors of the present invention railroad noise barriers and claim 5 according to claim 1, it is possible to reduce the sound transmitted by the gap leakage, railway noise barriers height The soundproofing performance can be improved while keeping the same as the conventional one . Moreover, since the radiation of the collision sound generated by the collision between the soundproof panel and the panel support member can be reduced, the soundproof performance can be further improved .

According to soundproof performance improvement methods of the railroad noise barriers by the inventors of the railroad noise barriers and claim 6 according to the invention of claim 2, it is possible to reduce the amount by radiation has not been conventionally considered collision noise, railroad The soundproofing performance can be improved by keeping the height of the soundproofing wall the same as before.

According to soundproof performance improvement methods of the railroad noise barriers and railroad noise barriers by the inventors of the claims, the damping sheets peak value of loss tangent (Tan?) Is made of an organic polymer material is 1.5 or more By using a vibration damping material provided on the outer surface of the sheet and a restraining member having a longitudinal elastic modulus of 1 GPa or more, workability is easy, and excellent vibration damping performance is achieved. The vibration-damping sheet that has the component absorbs vibrations and collision noise, and can ensure high soundproofing performance. Therefore, it is possible to improve the soundproof performance without increasing the height of the existing soundproof wall for railway .

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

1 and 2 show a first embodiment of a railway noise barrier and a method for improving the noise insulation performance thereof according to the present invention. The railway noise barrier (1) includes a plurality of railway noise barriers (1) fixed to the ground at predetermined intervals. Adjacent to the vertical support (2) made of H-shaped steel and the horizontal panel support (3) made of the upper, middle, and lower three-stage square pipes secured between the support (2) via a slight gap Vibration control bonded to the sound insulation panel (4) so as to close the gap (G) between the multiple flexible board vertical sound insulation panels (4) and adjacent sound insulation panels (4) Material (5).

  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 a railway soundproof wall and a method for improving the soundproof performance thereof according to the present invention. The bonding area of the damping material (5) is different from that of the first embodiment. Yes. 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 considerations on how to improve sound transmission in the railway noise barrier (1). There are five types of sound observed outside the noise barrier for railways (1): A: direct sound, B: wraparound sound, C: transmitted sound, D: gap leak sound, E: radiation of collision sound. For A and B, it is necessary to increase the height of the railway noise barrier (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 for railway (1) itself shakes greatly when passing through the vehicle, which causes the panel support (3) and soundproof panel (4) to collide, and this vibration is applied to the soundproof wall for railway. Propagated to (1) 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 embodiments described above, the vibration damping material (5) is attached to the existing railway noise barrier (1) afterwards. 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 railway noise barrier.

  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 railway 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) and (5b) are separated from each other 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 The fluctuation when the fluctuation of the gap (G) is large can be absorbed by the overlapping portion (J), and the damping materials (5a) and (5b) are prevented from peeling off.

FIG. 1 is a front view showing an embodiment of a railway noise barrier 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 railway noise barrier according to the present invention. FIG. 4 is a vertical sectional view showing a preferred embodiment of a method for improving the soundproof performance of a railway soundproof wall according to the present invention. Figure 5 is a diagram for explaining the operation of the soundproofing performance improvement methods of the railroad noise barriers and railroad noise barriers according to the invention. FIG. 6 is a perspective view showing one specific example of construction of a railway noise barrier according to the present invention.

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

Claims (6)

In the soundproof wall for railways, which is formed by fixing a plurality of soundproof panels to a panel support member that is secured between struts so as to be adjacent to each other through a slight gap,
A damping sheet made of an organic polymer material having a peak value of loss tangent (Tan δ) 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. have damping material, soundproof railway, characterized in that it is combined Ri bonded over substantially the entire acoustic panel except a portion that is fixed to and panel support member so as to close the gap between the acoustic panel adjacent walls. In railway soundproof wall is a plurality of acoustic panel is secured passes the unstoppable panel support between posts so as to be adjacent via some gap formed Rukoto,
A damping sheet made of an organic polymer material having a peak value of loss tangent (Tan δ) 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. have damping material, together are adhered to the acoustic panel so as to sandwich the panel support member from above and below, soundproofing railway clearance between soundproofing panels adjacent and wherein the have escaped busy by a sealant wall. Claim 1 or 2 railroad soundproof walls waterproof the attachment surface damping material soundproof panel is characterized in that it into effect. The railway soundproof wall according to claim 1 or 2 , wherein the damping material is divided at a gap portion between adjacent soundproof panels . Without increasing the height of the existing soundproof wall for railways, which is formed by fixing multiple soundproof panels to panel supports secured between the columns so that they are adjacent to each other through a slight gap A method for improving soundproofing performance , comprising a vibration damping sheet made of an organic polymer material having a peak loss tangent (Tanδ) peak value of 1.5 or more, a longitudinal elastic modulus of 1 GPa provided on the outer surface of the sheet. almost entirely to the damping of the acoustic panel, except for portions that are fixed and the panel support member as above in which using the damping material is composed of a restraining member, close the gaps between adjacent acoustic panel Soundproofing performance improvement methods of the railroad soundproof walls, wherein the combining Ri pasting the wood. Without increasing the plurality of acoustic panel height of existing railroad soundproof walls, which is fixed passes the unstoppable panel support between posts so as to be adjacent via some gap formed Rukoto A method for improving soundproofing performance , comprising a vibration damping sheet made of an organic polymer material having a peak loss tangent (Tanδ) peak value of 1.5 or more, a longitudinal elastic modulus of 1 GPa provided on the outer surface of the sheet. Using the vibration damping material composed of the restraining member as described above, the vibration damping material is bonded to the surface of the sound insulation panel on the panel support material side so as to sandwich the panel support material from above and below , and adjacent sound insulation panels A method for improving the soundproofing performance of a railway soundproofing wall, characterized in that a gap between the two is sealed with a sealing material .

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