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BACKGROUND OF THE INVENTION 
       [0001]    The present invention relates to a sound insulating device for reducing noise from vehicles, trains and the like in expressways or railroads, or other sound sources. 
         [0002]    Conventionally, a sound insulating device in which a plurality of plate shaped sound insulating members is attached to an H-shaped steel arranged in an upstanding manner in plurals along a road, a railway track, and the like, and this sound shielding member is arranged in a form of a wall surface is known. 
         [0003]    This type of sound insulating device has an advantage in that the configuration is simplified, the number of components is few, and the workability is satisfactory since the sound insulating member is stacked in plurals in an up and down direction by fitting both ends from above the H-shaped steel when being attached to the H-shape steel so that the sound insulating member is directly attached to the H-shaped steel. 
         [0004]    Such sound insulating device includes a railroad soundproof wall arranged on a ground along the track of the railroad vehicle, forming a sound absorbing surface on the surface facing the track of the upstanding wall part, and absorbing rolling noise of the wheels and noise from the motor (see for example, patent document 1). 
         [0005]    The sound absorbing panel at this soundproof wall is made by filling sound absorbing materials such as glass wool inside a flat box having a sound absorbing surface side of the front surface as porous plate and the rear surface as steel plate, and this sound absorbing panel is attached by being stacked vertically with respect to a supporting column arranged on the track. 
         [0006]    In addition, a sound insulating wall arranged on the road or the railroad is known, where the sound insulating wall is attached to the upstanding H-shaped steel by stacking a plurality of panel shaped sound absorbing plates, in which sound absorbing materials are filled in a box frame, in the up and down direction (see for example, patent document 2). 
         [0007]    The sound insulating wall aims to enhance air tightness by interposing an elastic air tight member on the contacting surface of the sound absorbing plate in addition to the sound absorbing plate stacked in the up and down direction, and to prevent sound leakage. 
         [0008]    This sound insulating member in such sound insulating wall incorporates sound absorbing materials such as glass wool and cotton in the box shaped case having a great number of sound absorbing holes perforated in the front surface, or sandwiches the same with a louver, and aims to insulate sound by absorbing noise at the sound absorbing material. 
         [0000]    [Patent document 1] Japanese Publication No. 3660335
 
[Patent document 2] Japanese Laid-Open Patent Publication No. 2004-132018
 
       SUMMARY OF THE INVENTION 
       [0009]    The soundproof wall described in patent document 1 and patent document 2 attempts to absorb noise by means of sound absorbing material, but since both front surface and rear surface of the aluminum plate materials sandwiching the sound absorbing material contact with the sound absorbing material because of its structure when the sound absorbing material is used, the sound wave easily reflects and lowers the sound absorbing efficiency. 
         [0010]    Furthermore, when sound absorbing materials such as glass wool and cotton are used, moisture such as rainwater and snow is absorbed since such sound absorbing material has water retention characteristics, and thus the sound absorbing performance temporary lowers. Furthermore, the sound absorbing material degrades by absorption of such moisture, whereby the sound absorbing performance becomes difficult to maintain over a long period and maintenance such as repair and replacement must be carried out frequently to maintain the sound absorbing performance. 
         [0011]    In addition, such soundproof wall requires a gap to be filled with a different sound absorbing member sandwiched between a flange of the H-shaped steel and the sound insulating member, or the sound insulating member to be fixed to the H-shaped steel by bolt and the like to fix the sound insulating member to the H-shaped steel when attaching the sound insulating member to the H-shaped steel, and thus assembly workability gradually degrades. Furthermore, since the sound absorbing material is used, the problems that the weight increases, and the number of components increases occurs. 
         [0012]    The problems that the sound shielding member has a complicating configuration, the manufacturing becomes difficult, and cost increases occur since it is configured by a plurality of members as described above. When the sound insulating member breaks, the sound absorbing material must be disposed as industrial waste, and thus a problem that the processing cost increases occurs. 
         [0013]    The present invention is developed to overcome the problems of the prior art, and aims to provide a sound insulating device that exhibits excellent sound insulating property, which sound insulating device is capable of maintaining this sound insulating property over a long period, excels in assembly workability, and is easily manufactured and readily disposed. 
       Means for Solving the Problems 
       [0014]    To attain the above object, the invention set forth in claim  1  is directed to a sound insulating device, wherein a long sound insulating member including a polyhedron body bent at a predetermined angle to open a sound source side is sequentially stacked between supporting columns arranged in an upstanding manner at a predetermined spacing to configure a sound insulating wall having an appropriate height; and a sound wave from the sound source is interfered with each other by the polyhedron body to reduce noise. 
         [0015]    The invention set forth in claim  2  is directed to a sound insulating device, wherein the supporting column uses a H-shaped steel, and the sound insulating members are stacked and fixedly attached by sandwiching a sandwiching portion formed at both ends of the sound insulating member between flanges of the H-shaped steel. 
         [0016]    The invention set forth in claim  3  is directed to a sound insulating device, wherein the sandwiching portion is formed by arranging a cutout portion at both ends of the sound insulating member, a width allowing the sandwiching portion to be inserted between the flanges of the H-shaped steel is provided by the cutout portion, and the sandwiching portion is inserted and held between the flanges. 
         [0017]    The invention set forth in claim  4  is directed to a sound insulating device, wherein each bent portion of the sound insulating member is bent to 142° to configure the polyhedron body. 
         [0018]    The invention set forth in claim  5  is directed to a sound insulating device, wherein one end side of the sound insulating member is bent to an opening side on a side opposite to a bending direction of the bent portion to form a bending portion, and an elastic member such as elastomer is fitted between the sound insulating member that overlaps the bending portion. 
         [0019]    The invention set forth in claim  6  is directed to a sound insulating device, wherein a blocking plate is fixedly attached to both ends of the sound insulating member by means such as spot welding. 
         [0020]    The invention set forth in claim  7  is directed to a sound insulating device, wherein a through hole is formed near upper and lower ends of the sound insulating member, and a connecting rope-like material is inserted through the through hole to integrally hold the stacked sound insulating members. 
         [0021]    The invention set forth in claim  8  is directed to a sound insulating device, wherein the insertion of the connecting rope-like material is easily ensured by interposing a pipe member between the upper and lower pass-trough holes. 
       EFFECTS OF THE INVENTION 
       [0022]    According to the invention of claim  1 , a sound insulating device that exerts excellent sound insulating property is provided, the sound insulating device capable of maintaining this sound insulating property over a long period by excellent durability. Furthermore, the sound insulating device also excels in assembly workability, can be easily manufactured and readily disposed, and thus can suppress the cost. 
         [0023]    According to the invention of claims  2  and  3 , the sound insulating device is such in which a wall surface is formed by simply attaching the sound insulating members with respect to the supporting column, and furthermore, the width of the sandwiching portion can be changed on site, whereby the dimension between the sandwiching portion can be adjusted with respect to the dimension between the different flanges of the H-shaped steel, thereby reliably attaching the sound insulating member. 
         [0024]    According to the invention of claim  4 , the sound insulating device can reduce the noise most effectively, and can exert high sound insulating property. Furthermore, the sound insulating device can be easily formed, and cost such as material cost and processing cost can be reduced. 
         [0025]    According to the invention of claim  5 , the sound insulating device that can further enhance the noise reducing effect by effectively preventing sound leakage, and that excels in decoration, and can enhance safety is obtained. 
         [0026]    According to the invention of claim  6 , the sound insulating device that further enhances sound insulating property and can reliably prevent sound leakage to the outside, and furthermore, easily can attach the sound insulating member between the flanges of the H-shaped steel since the shape thereof can be held, and can enhance the durability by enhancing the strength of the sound insulating member is obtained. 
         [0027]    According to the invention of claim  7 , the sound insulating device that can strongly holds the sound insulating members in a stacked state, and that absorbs impact with the entire sound insulating member that is fixed when impacted by car, train or the like to alleviate the shock is obtained. 
         [0028]    According to the invention of claim  8 , the sound insulating device that easily can allow insertion of the connecting rope-like material through the stacked sound insulating members, and that can enhance workability and safety is obtained. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0029]    The invention, together with objects and advantages thereof, may best be understood by reference to the following description of the presently preferred embodiment together with the accompanying drawings in which: 
           [0030]      FIG. 1  is a partially enlarged longitudinal cross sectional view showing a sound insulating device according to the present invention; 
           [0031]      FIG. 2  is a front view showing the sound insulating device according to the present invention; 
           [0032]      FIG. 3  is a cross sectional view taken along line A-A of  FIG. 2 ; 
           [0033]      FIG. 4  is an enlarged plan view of  FIG. 2 ; 
           [0034]      FIG. 5  is an enlarged view of the main parts of  FIG. 4 ; 
           [0035]      FIG. 6  is a partially enlarged perspective view of a sound insulating wall; 
           [0036]      FIG. 7  is an explanatory view showing arrangement in a noise measuring test; 
           [0037]      FIG. 8  is a side view showing a unit body of a sound insulating member in a noise measuring test; and 
           [0038]      FIG. 9  is an explanatory view of the principle showing mirror image principle in a reflective ground in a boundary element method. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0039]    One embodiment of a sound insulating device according to the present invention will now be described in detail based on the drawings. 
         [0040]    A supporting column  30  is arranged in an upstanding manner at a predetermined spacing on both sides or on one side of a expressway (include general road), and railroad track as shown in  FIG. 2 , where a lower part of this supporting column  30  is embedded in the ground E by a predetermined length. Furthermore, the lower part of this supporting column  30  is fixed by an anchor bolt  32 , as shown in  FIGS. 3 and 4 . In the present embodiment, the supporting column  30  uses an H-shaped steel which is general product, and is arranged in an upstanding manner at spacing of 2000 mm. 
         [0041]    In  FIGS. 1 to 3 , a sound insulating member  11  is bent at a predetermined angle and has the sound source side opened. 
         [0042]    The sound insulating member  11  is formed by forming a long thin plate with aluminum for the material, and press working the same to molding process the plate to a long polyhedron shape. The bent angle of each bent portion  15  is 142°, whereby the polyhedron body  12  having plane portions  12   a ,  12   b ,  12   c ,  12   d ,  12   e , and  12   f  shown in  FIG. 1  is formed. In molding processing the sound insulating member  11 , the member is formed to have a thickness of about 1.8 mm and a length of about 2000 mm, which is the spacing of the H-shaped steel  30 . In addition, the height is about 250 mm. 
         [0043]    As shown in  FIGS. 5 and 6 , a sandwiching portion  13  is formed at both ends of the sound insulating member  11 . This sandwiching portion  13  is formed by arranging a cutout portion  14  at both ends of the sound insulating member  11 , in which cutout portion  14  is cutout by length L 1  so that the width W 1  of the sandwiching portion  13  is slightly smaller than the width W 2  between the flanges  31 ,  31  of the H-shaped steel  30 , and to a width enabling the sandwiching portion  13  to be inserted between the flanges  31 ,  31  of the H-shaped steel  30  by this cutout portion  14 . 
         [0044]    On the other hand, the length L 2  in the long direction of the cutout portion  14  is set to a length that the sandwiching portion  13  can be attached to the flange  31 , but a slight margin is desirably provided. Thus, even if dimension error is produced in the spacing of the upstanding H-shaped steels  30 ,  30 , the error can be absorbed thereby reliably attaching the sound insulating member  11 . The sound insulating member  11  is positioned in the length direction after attachment by the cutout portion  14 , and is prevented from oscillating with respect to the H-shaped steel  30 . 
         [0045]    The sound insulating member  11  configures a sound insulating wall  10  having an appropriate height by inserting and sandwiching the sandwiching portions  13 ,  13  at both ends between the flanges  31 ,  31 , and sequentially stacking and fixedly attaching this sound insulating member  11  between the H-shaped steels  30 ,  30 . In the present embodiment, a plurality of sound insulating members  11  is appropriately stacked to have the height of the sound insulating wall  10  of about 3000 mm. The sound insulating member  11  is positioned in the front and back direction with respect to the H-shaped steel  30  by being held between the flanges  31 ,  31 . 
         [0046]    When the sound insulating members  11  are stacked, the bent portions  15 ,  15  of the upper and lower sound insulating members  11  contact each other, and thus are positioned in the height direction as shown in  FIG. 1 . 
         [0047]    A buffer material made of elastic body (not shown) may be interposed between the bent portions  15 ,  15 , in which case, the upper and lower sound insulating members  11 ,  11  are reliably positioned and fixed while absorbing dimension error via the buffer material. 
         [0048]    The sound insulating member  11  is also continuously arranged in the left and right directions by being attached between the continuously arranged H-shaped steels  30 ,  30  . . . . 
         [0049]    The sound insulating member  11  interferes the sound wave from the sound source with each other by the plane portions  12   a ,  12   b ,  12   c ,  12   d ,  12   e ,  12   f  of the polyhedron body  12  by being arranged such that the opening side of the polyhedron body  12  faces the sound source side, whereby noise can be reduced. 
         [0050]    As shown in  FIG. 6 , a blocking plate  18  is fixedly attached by means of spot welding and the like at both ends of the sound insulating member  11 , and the ends of the sandwiching portion  13  are covered by this blocking plate  18 . Thus, the ends of the sound insulating member  11  are blocked, and the sound is prevented from leaking from this end side. Both ends of the sound insulating member  11  are reinforced by fixedly attaching this blocking plate  18 , thereby preventing the sound insulating member  11  from distorting. 
         [0051]    A bending portion  16  is formed by bent to the opening side on opposite to the bending direction of the bent portion  15  at the lower end side which is one end of the sound insulating member  11 . An end side of the other sound insulating member  11  contacts to this bending portion  16  when the sound insulating members  11  are stacked in the up and down direction as in  FIG. 1 , thereby blocking an opening portion formed by the upper and lower sound insulating members  11 ,  11 . 
         [0052]    An elastic member  17  such as elastomer is fitted between the sound insulating members  11  overlapping the bending portion  16 . The elastic member  17  is formed to a cross sectional shape that can be fitted between the bent portion  15  and the bending portion  16 , is formed long to adapt to the length of the sound insulating member  11 , or is formed short to be fitted at an appropriate spacing. 
         [0053]    The bending portion  16  may be omitted, in which case, a cap (not shown) is arranged in place of the bending portion  16 , and the opening portion created by the upper and lower sound shielding members  11 ,  11  is covered by this cap. 
         [0054]    In  FIG. 6 , through holes  19 ,  19  are formed at an appropriate position near the upper and lower ends of the sound insulating member  11 , and are provided so as to allow a connecting rope-like material  20  to be inserted in the through holes  19 ,  19 . The connecting rope-like material  20  is formed by forming an elongated carbon, and twisting this carbon material to a wire form. 
         [0055]    In inserting the connecting rope-like material  20 , each through hole  19  is continuously passed through up to the sound insulating member  11  on the lower side from the sound insulating member  11  on the upper side of the H-shaped steel  30 , where this connecting rope-like material  20  can be formed with an enlarged diameter part  20   a , for example, as shown in the figure in advance so as to be in a tensioned state while preventing slip-out from above or below, and the stacked sound insulating members  11  can be integrally held by the connecting rope-like material  20 . When the connecting rope-like material  20  is provided, even when a force is applied on the opening side through, for example, impact of vehicle or train, such force can be dispersed and alleviated at the sound insulating members  11  stacked in the up and down direction via the connecting rope-like material  20 . 
         [0056]    As shown in chain double-dashed line in  FIGS. 1 and 6 , a pipe member  21  may be fixedly attached between the upper and lower through holes  19 ,  19  while being interposed in the sound insulating member  11 , thereby easily ensuring insertion of the connecting rope-like material  20 . In this case, when the connecting rope-like material  20  is inserted from one through hole  19 , the material  20  is easily taken out from the other through hole  19 , and thus the connecting rope-like material  20  can be easily passed through the stacked sound insulating member  11 . 
         [0057]    Although not shown, the pipe member is arranged long to the height of the sound insulating wall  100 , and the pipe member is attached with respect to the stacked sound insulating members  11 ,  11 . In this case, the connecting rope-like material  20  can be passed through the through hole  19  of the upper most sound insulating member  11  to the through hole  19  of the lower most sound insulating member  11  at once, whereby the connecting rope-like material  20  can be easily inserted. 
         [0058]    Furthermore, although not shown, after the connecting rope-like material  20  is passed through the through holes  19  of the sound insulating members  11  stacked in the vertical direction, the connecting rope-like material  20  is passed through the through hole  19  of the sound insulating member  11  adjacently stacked in the vertical direction to cross the H-shaped steel  30  so that the connecting rope-like material  20  is tensioned in a substantially U-shaped state thus preventing slip-out of the end of the connecting rope-like material  20 , whereby two stacked sound insulating members  11  can be held with one connecting rope-like material  20 , and the attachment task is simplified. 
         [0059]    In the present example, a noise eliminator  24  of polyhedron type such as soundproof head board (registered trademark) patent filed by the applicant of the present invention is attached to the upper part of the sound insulating wall  10 , as shown in  FIGS. 2 and 3 . 
         [0060]    The sound eliminator  24  is made up of a first polyhedron member  25  and a second polyhedron member  26 , which are formed into a polyhedron by bending an aluminum material to a predetermined angle (142°) by processing means such as press molding and forming bent portions  25   a ,  26   a . The thickness, height, and depth thereof can be changed according to the required sound insulating property and the state of the road and railroad to which it is to be attached. The length is the same length as the sound insulating member. 
         [0061]    The first polyhedron member  25  is attached with a lower part side of an attachment part  25   b  opened to the upper end of the back side of the sound insulating wall  10 . The second polyhedron member  26  has the lower part side attached so as to open in a substantially horizontal direction near the vertex of the first polyhedron member  25 . 
         [0062]    When noise is produced, the sound wave is sound insulated by the sound insulating wall  10 , but some of the sound wave advances upward along the sound insulating wall  10  and attempts to circumvent to the outer side of the sound insulating wall  10 . 
         [0063]    When the sound eliminator  24  is arranged, the sound wave attempting to circumvent is sound insulated by interfering and canceling the sound wave similar to sound insulation of the sound insulating member  11 , to be hereinafter described, by the first polyhedron member  25 . 
         [0064]    The sound wave also advances upward and attempts to circumvent the first polyhedron member  25 , but the sound wave that has advanced to the outer side of the first polyhedron member  25  advances to the inner side of the second polyhedron member  26  and thus is sound insulated, similar to the above, whereby leakage of sound wave is prevented. 
         [0065]    Therefore, when the noise (sound wave) that cannot be sound insulated by the sound insulating wall  10  advances upward, the leakage to the outer side is suppressed to a minimum by the double sound insulating members arranged at a high position. 
         [0066]    In the present example, the sound eliminator  24  of the above configuration is provided, but may be a sound eliminator of other configurations, where high sound insulating effect is exerted and high frequency region (high note) is also reliably sound insulated when such sound eliminator is provided compared to when only the sound insulating wall  10  is provided. 
         [0067]    The sound insulating member  11  may be arranged in shapes other than the above as long as it is a polyhedron shape, and the length may be changed so as to correspond to the spacing of the H-shaped steel  30 , the thickness may be changed to enhance strength, or the height may be changed. The processing means may be different molding means such as extrusion and pultrusion in addition to press molding. 
         [0068]    The sound insulating member  11  forms the sandwiching portion  13  by forming the cutout portion  14 , and thus the dimension of the sandwiching portion  13  can be changed by changing the cutout dimension of the cutout portion  14 . The sandwiching portion  13  may be attached to the H-shaped steel  30  including flange  31  of different lengths by changing the dimension of the sandwiching portion  13 . 
         [0069]    The sandwiching portion may be formed by means other than arranging the cutout portion  14  as long as it has a shape of being sandwiched between the flanges  31 ,  31  of the H-shaped steel  30 , and the forming means is not limited to the above described mean. In the present example, the H-shaped steel is used as the supporting column  30  due to the reason of being universal, but the supporting column  30  is not particularly limited to the H-shaped steel, and a universal product corresponding to the shape of the sandwiching portion may be used. In addition, the sound insulating member  11  may have the portion other than the sandwiching portion  13  projecting out to the sound source side, where the upper and lower portions of the sound insulating member  11  may be projected out to form a large sound insulating site in  FIG. 1 . 
         [0070]    The sound insulating member  11  uses aluminum as the material, but metal materials other than aluminum or resin may be used. In particular, when forming the sound insulating member  11  by resin, the visibility can be improved by using transparent or semi-transparent resin, whereby surrounding view is enhanced and light can be let in through the sound insulating member. 
         [0071]    The height of the sound insulating wall  10  and a sound eliminator  22  may be appropriately changed depending on the magnitude of the noise produced from the vehicle or train serving as a sound source, height (height of vehicle and train) of the noise producing origin, and in an aim of enhancing the view from the vehicle and the train, reducing cost, and enhancing work efficiency in assembling, may be set to an arbitrary height according to the installing state. 
         [0072]    A simulation of noise measuring test was performed for the sound insulating device of the present embodiment, and the result thereof will be shown. 
         [0073]    A simulation method is a two-dimensional boundary element method (hereinafter referred to as 2D-BEM), where insertion loss of the sound insulating wall in a semi-free space having reflective ground is obtained. This is because the insertion loss obtained by the 2D-BEM substantially matches the insertion loss value of when a point sound source and a sound receiving point are arranged in a cross section perpendicular to the target sound insulating wall. 
         [0074]    The arrangement of the sound source, the sound insulating wall, and the sound receiving point in the noise measuring test is shown in  FIG. 7 . The sound source is arranged on the ground as point sound source at a position away from the sound insulating wall by 7.5 m. The sound receiving point is arranged at fourteen locations of R1 to R14 at different distance and length from the sound insulating wall. The position of each sound receiving point (distance, height from sound insulating wall) is as shown in the figure. 
         [0075]    The sample article used in the simulation was only the sound insulating wall formed to have a height of 3 m and a width of 150 mm, and a sound eliminator was not attached. Three types of sound insulating walls were tested as the sample. 
         [0076]    Sample 1 was a reflective linear wall. Sample 2 was a sound absorbing linear wall, where the sound absorbing property was 0.8 and had a configuration similar to the sound insulating wall that is generally used. Sample 3 was a sound installing device of the present invention, where the sound insulating member  23  shown in  FIG. 8  was stacked in the vertical direction to form the wall surface. The thickness of samples 1 to 3 was the same, and the conditions by the thickness were conformed. 
         [0077]    The sound pressure level of each sound receiving point of R1 to R12 was obtained for when the sound insulating wall by each sample was arranged and for when the sound insulating wall was not arranged by the 2D-BEM under the above described conditions, and the insertion loss of the sound insulating wall by each sample was obtained by the following equation. 
         [0000]      IL= L   0   −L   B    
         [0000]    Where IL is the insertion loss (dB), L 0  is the sound pressure level (dB) of when the sound insulating wall was not arranged, and L B  is the sound pressure level (dB) of when the sound insulating wall was arranged. 
         [0078]    In numerical analysis, calculation with respect to sound field was performed as in  FIG. 9  using a principle of reflection by the reflective ground. The target frequency range is 50 Hz band to 4000 Hz band, and the response with respect to the 1/81 octave band frequency was calculated. In obtaining the insertion loss with respect to the ⅓ octave band, the values of 27 frequencies contained in the respective band were energy produced to obtain the insertion loss. After performing a correction taking into consideration spectrum (A property weighing) of the road traffic noise with respect to the analytic value of the ⅓ octave band in the respective patterns of with/without barrier wall (sound insulating wall), energy was produced to obtain the overall value, and the insertion loss (O.A.) with respect to the road traffic noise was obtained by taking the difference of the two. 
         [0079]    The result of analysis of the insertion loss at each sound receiving point R1 to R14 is shown in table 1, and each relative level (effect amount) with respect to the sample 2 (sound absorbing linear wall) is shown in table 2 for comparison. 
         [0000]    
       
         
               
               
               
               
               
               
             
               
               
               
               
               
               
             
           
               
                 TABLE 1 
               
               
                   
               
               
                   
                 Horizontal 
                   
                   
                 Sample 2 
                   
               
               
                   
                 distance 
                   
                   
                 (sound 
               
               
                 Sound 
                 from 
                   
                 Sample 1 
                 absorbing 
                 Sample 3 
               
               
                 receiving 
                 barrier 
                 Height 
                 (linear 
                 linear 
                 (present 
               
               
                 point 
                 wall (m) 
                 (m) 
                 wall) 
                 wall) 
                 invention) 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 R1 
                 5.0 
                 0.0 
                 17.0 
                 17.7 
                 19.9 
               
               
                 R5 
                 10.0 
                 0.0 
                 15.7 
                 16.3 
                 18.2 
               
               
                 R2 
                 5.0 
                 1.2 
                 19.4 
                 20.1 
                 22.2 
               
               
                 R6 
                 10.0 
                 1.2 
                 18.7 
                 19.3 
                 21.3 
               
               
                 R9 
                 15.0 
                 1.2 
                 18.4 
                 19.0 
                 21.0 
               
               
                 R12 
                 20.0 
                 1.2 
                 18.3 
                 18.8 
                 20.3 
               
               
                 R3 
                 5.0 
                 3.5 
                 13.7 
                 14.1 
                 15.5 
               
               
                 R7 
                 10.0 
                 3.5 
                 15.7 
                 16.2 
                 17.6 
               
               
                 R10 
                 15.0 
                 3.5 
                 16.4 
                 16.9 
                 18.3 
               
               
                 R13 
                 20.0 
                 3.5 
                 16.7 
                 17.2 
                 18.8 
               
               
                 R4 
                 5.0 
                 5.0 
                 5.3 
                 5.4 
                 5.8 
               
               
                 R8 
                 10.0 
                 5.0 
                 12.4 
                 12.7 
                 13.8 
               
               
                 R11 
                 15.0 
                 5.0 
                 14.5 
                 14.9 
                 16.1 
               
               
                 R14 
                 20.0 
                 5.0 
                 15.4 
                 15.9 
                 17.1 
               
               
                   
               
             
          
         
       
     
         [0000]    
       
         
               
               
               
               
               
               
             
               
               
               
               
               
               
             
           
               
                 TABLE 2 
               
               
                   
               
               
                   
                 Horizontal 
                   
                   
                 Sample 2 
                   
               
               
                   
                 distance 
                   
                   
                 (sound 
               
               
                 Sound 
                 from 
                   
                 Sample 1 
                 absorbing 
                 Sample 3 
               
               
                 receiving 
                 barrier 
                 Height 
                 (linear 
                 linear 
                 (present 
               
               
                 point 
                 wall (m) 
                 (m) 
                 wall) 
                 wall) 
                 invention) 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 R1 
                 5.0 
                 0.0 
                 −0.7 
                 — 
                 2.2 
               
               
                 R5 
                 10.0 
                 0.0 
                 −0.6 
                 — 
                 1.9 
               
               
                 R2 
                 5.0 
                 1.2 
                 −0.7 
                 — 
                 2.2 
               
               
                 R6 
                 10.0 
                 1.2 
                 −0.6 
                 — 
                 2.0 
               
               
                 R9 
                 15.0 
                 1.2 
                 −0.6 
                 — 
                 2.0 
               
               
                 R12 
                 20.0 
                 1.2 
                 −0.6 
                 — 
                 1.5 
               
               
                 R3 
                 5.0 
                 3.5 
                 −0.4 
                 — 
                 1.4 
               
               
                 R7 
                 10.0 
                 3.5 
                 −0.5 
                 — 
                 1.4 
               
               
                 R10 
                 15.0 
                 3.5 
                 −0.5 
                 — 
                 1.5 
               
               
                 R13 
                 20.0 
                 3.5 
                 −0.5 
                 — 
                 1.5 
               
               
                 R4 
                 5.0 
                 5.0 
                 −0.2 
                 — 
                 0.4 
               
               
                 R8 
                 10.0 
                 5.0 
                 −0.3 
                 — 
                 1.1 
               
               
                 R11 
                 15.0 
                 5.0 
                 −0.4 
                 — 
                 1.2 
               
               
                 R14 
                 20.0 
                 5.0 
                 −0.4 
                 — 
                 1.3 
               
               
                   
               
             
          
         
       
     
         [0080]    From the results of tables 1 and 2, the sample 3 (sound insulating device of present invention) had higher insertion loss and higher relative level than sample 1 and sample 2 at all sound receiving points. Thus, the sound from the sound source was reduced the most in sample 3 among the samples used in the simulation, and thus proved to exert high sound insulating effect. 
         [0081]    The operation in the soundproof device will now be specifically described. 
         [0082]    The sound insulating wall  10  sound insulates by means of the sound insulating member  11 ( 23 ) having a polyhedron shape with the sound source side opened, and thus effective sound insulation can be performed by applying principles such as multiple regression, interference of sound wave, enclosure of reflected sound, and the like. The sound wave that has advanced in the direction of the sound insulating member  11 ( 23 ) advances to the plane portion  12   a ,  12   b ,  12   c ,  12   d ,  12   e ,  12   f  side configuring the polyhedron body  12 . The sound wave that has reached each plane portion  12   a ,  12   b ,  12   c ,  12   d ,  12   e ,  12   f  is reflected by the plane portion  12   a ,  12   b ,  12   c ,  12   d ,  12   e ,  12   f , but is collected so as to converge near substantially the center in cross section of the sound insulating member  23  since an angle is formed by the bent portion  15  in each plane portion  12   a ,  12   b ,  12   c ,  12   d ,  12   e ,  12   f.    
         [0083]    The collected sound wave interferes and cancels with each other, thereby obtaining a high sound insulating effect. From tables 1 and 2, the sound insulating efficiency is higher than the soundproof wall using a sound absorbing material. 
         [0084]    Furthermore, since moisture is not absorbed as with the sound absorbing material, the sound insulating function will not deteriorate even in rain or snow, and thus the sound insulating wall  10  will not drastically deteriorate, whereby the sound insulting performance can be maintained over a long period. Thus, high sound insulating effect will always be obtained without performing maintenance frequently. 
         [0085]    In particular, the sound insulating member  11 ( 23 ) of the present embodiment reflects the noise so as to be effectively collected when the noise is advanced in the direction of the sound insulating member  11  by bending the bending angle of each bent portion  15  to 142°, and thus maximum interference can be obtained. 
         [0086]    The sound insulating member  11  is formed with the sandwiching portion  13  by forming the cutout portion  14  at both ends, the sandwiching portion  13  is sandwiched between the flanges  31 ,  31  of the H-shaped steel  30 , and the sound insulating members  11  are continuously held so as to be stacked to form the sound insulating wall  10 , and thus satisfactory assembly workability and since the sound absorbing material is not used and result in reduction in weight, further enhancement in workability are obtained, new components for fixing the sound insulating member  11  to the H-shaped steel  30  are not necessary, and high convenience is obtained in terms of conveyance and component management. 
         [0087]    Moreover, the sound insulating member  11  can be configured by one member, and the sound insulating member  11  can be easily molding processed by press molding, extrusion, or pultrusion when forming the sound insulating member  11 , and thus can be inexpensively mass produced. Furthermore, since the dimension in the length direction can be changed in molding, the sound insulating member  11  having a length that corresponds to the spacing of the H-shaped steel  30  can be formed. 
         [0088]    The sound insulating member  11  is arranged to a substantially semicircular shape in cross section by forming the bent portion  15 , is miniaturized while enhancing the sound insulating property, and can be installed without barely projecting to the road or the rail track side which is the noise producing side, whereby space is saved. 
         [0089]    When the sound insulating member  11  is damaged, the sound insulating member  11  can be inexpensively disposed since it does not use the sound absorbing material and thus does not need to be disposed as industrial waste, and furthermore, is recyclable. 
         [0090]    The sound insulating device of the present invention obtains sound insulating effect by being widely used in locations where noise is produced in addition to noise of expressways and railroads. Furthermore, the polyhedron shape of the sound insulating device of the present invention can be applied in various locations.

Summary:
The present invention aims to provide a sound insulating device that exerts excellent sound insulating property, the sound insulating device capable of maintaining the sound insulating property over a long period, excelling in assembly workability, and being simply manufactured and readily disposed. 
     In the sound insulating device, a long sound insulating member including a polyhedron body bent at a predetermined angle to open a sound source side is sequentially stacked between supporting columns arranged in an upstanding manner at a predetermined spacing to configure a sound insulating wall  10  having an appropriate height; and sound wave from the sound source is interfered with each other by the polyhedron body to reduce noise.