JP4796996B2 - Soundproof wall for tunnel and soundproof system for tunnel using the same - Google Patents

Description

  The present invention relates to a tunnel soundproof wall installed in a tunnel mine during excavation and a tunnel soundproof system using the same.

In tunnel construction, when blasting is used for excavation, measures to prevent vibration and noise in neighboring villages are a major issue. As a noise countermeasure in such tunnel construction, a tunnel soundproof wall having a wall surface made of a heavy object (sound absorbing material) having a high sound insulation effect in a low frequency sound region has been proposed (for example, see Patent Document 1).
JP 2006-283545 A

In the conventional sound barrier for tunnel as described above, the sound is basically attenuated by the collision with the sound absorbing material. Therefore, in order to improve the sound insulation, it is necessary to increase the amount of the sound absorbing material that is a heavy object, and therefore a large amount of the sound absorbing material must be arranged in order to suppress the leakage of the sound outside the tunnel. Moreover, since the increase in the amount of the sound absorbing material also leads to the reinforcement of the structure for supporting the soundproof wall, the construction labor is excessive. As described above, the conventional type of soundproof wall for tunnels has a problem that the construction labor and cost are increased in order to improve the soundproofing effect.
Accordingly, an object of the present invention is to provide a soundproof wall that improves the soundproofing effect at low cost without relying on an increase in weight.

  The soundproof wall for a tunnel according to the present invention is a soundproof wall for a tunnel that is installed in a tunnel mine during excavation, and includes a reflecting portion that forms a reflecting surface constituted by a concave curved surface, and the reflecting surface faces the face side. And a switching member for switching the posture of the reflecting portion between the front posture and the lateral posture facing the side of the tunnel.

According to the above configuration, in the front posture, the reflecting surface constituted by the concave curved surface faces the face side. Therefore, after the sound wave caused by blasting performed on the face side collides with the reflecting surface, the face face Reflect to the side. Therefore, the sound wave toward the wellhead side is reduced, and the sound pressure can be reduced. Moreover, the reflected wave subsequently collides with the next sound wave traveling from the face side to the wellhead side, and can be attenuated. The reflected wave that has not collided with the next sound wave is also attenuated by colliding with the wall surface of the tunnel and being refracted or attenuated by distance. Thus, the noise barrier for a tunnel of the present invention effectively suppresses noise from leaking outside the tunnel. Here, since the reflection part is provided to reflect sound waves on the reflection surface, it is not necessary to increase the weight only for the purpose of absorbing sound waves.
Further, the switching member switches the posture of the reflecting portion from a front posture to a horizontal posture in which the reflecting surface faces the tunnel side surface, thereby creating a space where the reflecting portion is located. In this way, even if the reflector plate occupies a large proportion of the cross section of the tunnel when it is in the front position, it can be used as a passage for vehicles and the like for transporting shears and equipment by adopting the horizontal position. Can be secured.

In the above-described characteristic configuration, it is preferable that the switching member includes a support column that rotatably supports the reflecting portion in a horizontal direction.
If comprised in this way, the attitude | position change of the said reflection part can be easily performed only by performing the operation | movement which rotates the said reflection part. And since the said reflection part rotates in a horizontal direction, when the said reflection part exists in a horizontal attitude | position, a large space can be ensured in the tunnel mine, especially the bottom face side used as a channel | path, such as a vehicle.

Further, in the above characteristic configuration, the reflecting portion is composed of a plurality of reflecting plates having a curved surface, and the support column is composed of a plurality of support members that rotatably support the reflecting plate in the horizontal direction. Are preferably arranged so that one concave curved surface is formed when each curved surface faces the face side.
If comprised in this way, when forming a large reflective part, the load concerning the support | pillar which supports each reflective part can be made small, for example. Since the noise barrier for tunnels of the present invention is exposed to explosion noise and vibration generated by blasting performed at the face of the tunnel, reducing the load on the support column as much as possible contributes to improving the durability of the noise barrier. In addition, since the reflecting portion is divided into a plurality of reflecting plates, it is easy to carry, and it is easy to carry in and out of the tunnel mine.

In the above-described characteristic configuration, it is preferable that the reflecting surface is a paraboloid that is centered in the tunnel orientation in the front posture.
The sound wave generated by blasting travels in parallel to the tunnel extension direction from the tunnel face side to the tunnel entrance side. Therefore, in the front posture, the central direction is in the axial direction of the reflecting surface made of a rotating paraboloid with the tunnel extension direction. Incident in parallel. For this reason, reflected waves tend to concentrate on the focal point of the reflecting surface. Therefore, when this reflected wave converges near the focal point, if it collides with a high sound pressure region at the head of the next sound wave, the next sound wave is strongly canceled, so that the noise reduction effect is enhanced.

The soundproof system for a tunnel according to the present invention includes a first soundproof wall on a face of a tunnel being excavated, a second soundproof wall on a wellhead side of the first soundproof wall, and the first soundproof wall 5. The tunnel soundproof wall according to claim 1, wherein the second soundproof wall is a soundproof wall that closes the tunnel across a transverse section.
According to such a configuration, the first soundproof wall substantially shields the sound wave toward the tunnel entrance, and further leaks the sound leaked to the tunnel entrance from the soundproof wall to the tunnel entrance across the cross section. Since another soundproof wall (second soundproof wall) that can be closed is provided for sound insulation, it is possible to make it difficult for sound to leak outside the mine without significantly increasing the weight of the second soundproof wall.

  According to the present invention, it is possible to improve the soundproofing effect at low cost without depending on the increase in the weight of the soundproofing wall for tunnels.

Embodiments of the present invention will be described below with reference to the drawings.
[Soundproof wall for tunnel]
A tunnel sound barrier (hereinafter abbreviated as “sound barrier”) 1 of the present invention shown in FIGS. 1 to 10 is installed in a tunnel T tunnel during excavation, and in particular, noise caused by blasting is caused by tunneling. Installed to prevent leakage outside T.
1 to 4 show a first embodiment of the soundproof wall of the present invention. The soundproof wall 1 according to this embodiment includes a reflecting portion 2 having a reflecting surface 20 that is a concave rotating paraboloid (a reflector shape of a parabolic antenna). The reflection unit 2 includes two reflection plates 21 having a curved surface obtained by dividing the reflection surface 20 into two equal parts. The material constituting the reflection plate 21 is not particularly limited as long as it has a property of reflecting sound by the reflection surface 20 on the surface. For example, a metal plate or the like can be used. Alternatively, the reflecting surface 20 may be formed by forming a layer made of a material having a property of reflecting the sound on the concave surface of the main body of the reflecting plate 21.

The soundproof wall 1 includes a switching member 3 that switches the posture of the reflecting portion 2. In this embodiment, the switching unit 3 is a support column that extends in the vertical direction across the ceiling surface in the tunnel T tunnel and the bottom surface of the tunnel T. This column is composed of a pair of column members 3, one end of each column member 3 being fixed to a transverse beam T2 (for example, made of H steel) that supports the ceiling surface in the tunnel T tunnel, and the other end fixed to the bottom surface. The reflecting plate 21 is supported in the middle part so as to be rotatable in the horizontal direction.
Furthermore, a lock mechanism (not shown) that locks the rotation of the reflection plate 21 is provided across the reflection portion 2 and the column member 3.

  In FIG. 1 and FIG. 2, each of the reflection plates 21 supported by each of the column members 3 is arranged so as to form the reflection surface 20 with its curved surface facing the face of the tunnel T. ing. In this way, the posture of the reflecting portion 2 with the reflecting surface 20 facing the face of the tunnel T is referred to as a “front posture”. Then, as shown in FIGS. 3 and 4, the respective reflecting plates 21 are rotated to the side surface side of the tunnel T, and the posture in which the reflecting surface 20 faces the side wall side of the tunnel T is referred to as a “lateral posture”.

  The sound generated on the face side by blasting is generated in a wave shape at a plurality of times at intervals, and travels along the tunnel of the tunnel T in parallel with the ceiling surface and the bottom surface of the tunnel. Therefore, if the sound barrier 1 having the reflecting portion 2 in the front posture is disposed at the center of the tunnel, the rotational movement of the reflector 21 is regulated by the lock mechanism, and the center of the tunnel proceeds in the tunnel T extension direction. The sound wave collides with the reflection surface 20 of the soundproof wall 1. Most of the reflected waves are focused on a focal point located in the center of the tunnel T tunnel, and then diffuse toward the wall surface (ceiling surface, bottom surface, side surface) of the tunnel T.

Moreover, in the area | region adjacent to the wall surface in the tunnel of the tunnel T, a sound pressure falls easily by friction with a wall surface, or a speed | rate falls easily. Therefore, noise caused by blasting is strong and propagates quickly in the center of the mine shaft. Therefore, when the reflected wave is focused in the vicinity of the focal point, if the next sound wave approaches the soundproof wall 1 from the face side, the reflected wave having a high sound pressure traveling toward the face side and the soundproof wall 1 side is directed. The parts of the next sound wave that travels with each other collide with each other and strongly cancel each other. Next, when the reflected wave is diffused toward the wall surface of the tunnel T, it collides with the next sound wave and cancels it, or when the reflected wave collides with the wall surface, it is refracted and attenuated. Attenuation increases. By at least one of these, it is possible to suppress noise generated by blasting from reaching the wellhead T1 side from the soundproof wall 1.
Since sound insulation is performed in this way, the sound pressure of the sound wave that reaches the wellhead T1 side from the sound barrier 1 is considerably lower than that at the time of generation.

Note that the higher the ratio of the maximum cross-sectional area of the reflecting portion 2 to the cross-sectional area of the tunnel T tunnel, the higher the sound pressure when the reflected wave converges, so these effects are likely to increase. Therefore, it is preferable to form a large reflecting surface 20 that has a high ratio of the maximum cross-sectional area of the reflecting portion 2 to the cross-sectional area of the tunnel of the tunnel T as long as there is no hindrance to transportation, construction, and the like.
When the reflecting surface 20 is formed in this way, if the reflecting portion 2 is composed of a plurality of reflecting plates 21, it is easy to carry and carry in and out of the tunnel T tunnel. As shown in FIGS. 3 and 4, the soundproof wall 1 forms a large space in the center of the mine shaft when the respective reflecting plates 21 are rotated in the horizontal direction and the reflecting portion 2 is in the horizontal posture. If it does in this way, the passage of vehicles for carrying out shearing and conveyance of equipment can be secured easily.

  Since the reflection surface 20 of the reflection portion 2 is a curved surface, the sound barrier 1 is easy to reflect without absorbing the blast and sound pressure caused by blasting. Further, unlike the conventional soundproof wall, it is not necessary to provide the heavy object or the sound absorbing material. Therefore, the soundproof wall 1 does not need to be increased in weight as in the case of the conventional soundproof wall, and can be reduced in weight as long as it can withstand a blast caused by blasting and the arrival of stones. Furthermore, it does not take time to carry and construct the reflector 20 and the switching member 3. Therefore, an excessive load is not imposed on the transportation and construction of materials, and high soundproof performance can be obtained at low cost.

5 to 8 show a second embodiment of the soundproof wall of the present invention. The points not particularly specified are the same as in the first embodiment.
The soundproof wall 4 according to this embodiment includes a long plate-like reflecting portion 5 in the left-right direction of the tunnel T. In the front posture, the reflecting portion 5 is curved to protrude toward the wellhead T1 side in a cross-sectional view cut in the vertical direction. A reflective surface 50 is formed on the concave surface facing the face of the reflective portion 5. The reflection surface 50 protrudes and curves toward the wellhead T1 in a cross-sectional view cut in the vertical direction. In the embodiment, the long plate-like reflecting portion 5 is divided into two equal parts in the length direction to form two reflecting plates 51. On the upper and lower ends of the convex surface 52 of the reflection plate 51, bottomed cylindrical guide portions 53 having openings on the upper and lower sides are formed.

The reflection part 5 is fixed in the tunnel of the tunnel T by a pair of support members 6 which are switching members. These strut members 6 have a pair of upper strut members 61 whose one end is fixed to the cross beam T2 on the ceiling surface of the tunnel T tunnel and the other end extends downward, and one end is fixed to the bottom surface of the tunnel T tunnel and the other end is upward. It consists of a pair of lower strut members 62 that extend. The other end of the upper column member 61 and the other end of the lower column member 62 are fitted on the guide portion 53 of the reflection plate 51. In this way, the reflecting plate 51 is rotatably supported by the column member 6. Further, a lock mechanism (not shown) for locking the rotation of the reflection plate 51 is formed between the reflection portion 5 and the column member 6, and the reflection plate 51 is rotated with the lock mechanism released. Can be made.
5 and 6, the reflection surface 50 of the soundproof wall 4 is in a front posture, and the reflection plates 51 have their curved surfaces facing the face of the tunnel T. The reflection portion 5 made of these reflection plates 51 is located in the center portion in a cross-sectional view in the tunnel T tunnel. 7 and 8 show the soundproof wall 4 in a lateral posture in which the reflecting plate 51 is rotated toward the side of the tunnel T and the reflecting plates 51 are separated from each other.

As shown in FIGS. 5 and 6, when the soundproof wall 4 in the front posture is disposed in the center of the mine shaft in a state where the rotational movement of the reflection plate 51 is restricted by a lock mechanism, The sound wave that has traveled through the center of the tunnel toward the T1 side collides with the reflection surface 50 of the soundproof wall 4 and is reflected. The reflected wave is focused on the tunnel center side of the tunnel T, and then diffuses toward the wall surface (ceiling surface, bottom surface, side surface) of the tunnel T.
When the reflected wave is focused, if the next sound wave approaches the soundproof wall 4 from the face side, the reflected wave with high sound pressure traveling toward the face side and the sound wave proceeding toward the soundproof wall 4 side. The next sound wave collides with the high sound pressure part and cancels each other. In addition, when the reflected wave diffuses toward the wall surface of the tunnel T, it collides with the next sound wave and cancels it, or when the reflected wave collides with the wall surface, it is refracted and attenuated. Attenuation increases. By at least one of these, it is possible to suppress noise generated by blasting from reaching the wellhead T1 side from the soundproof wall 4.
In this way, the sound pressure of the sound wave that reaches the wellhead T1 side from the soundproof wall 4 can be considerably reduced compared to when it occurs.

  As shown in FIGS. 7 and 8, the soundproof wall 4 also forms a large space in the center of the mine shaft when in the horizontal posture. If it does in this way, the passage of vehicles for carrying out shearing and conveyance of equipment can be secured easily.

[Soundproof system for tunnels]
The tunnel soundproofing system of the present invention will be described below.
As shown in FIGS. 1-8, the soundproof system for tunnels of this invention is provided with the two soundproof walls of the 1st soundproof walls 1 and 4 and the 2nd soundproof wall 9. As shown in FIG. The above-described tunnel soundproof walls 1 and 4 of the present invention are installed on the face side of the tunnel T as a first soundproof wall. As described above, the first sound barriers 1 and 4 reflect sound waves generated by blasting or the like traveling from the face side to the wellhead T1 side to the faceside, thereby preventing noise from leaking to the wellhead T1 side. Suppress.

However, since the first soundproof walls 1 and 4 in this embodiment do not block the tunnel across the cross section, the sound wave traveling in the region extending near the inner wall of the tunnel T in the tunnel T extension direction is 1 It leaks from the sound barriers 1 and 4 to the wellhead T1 side. Therefore, the second soundproof wall 9 is further installed on the wellhead T1 side of the first soundproof wall.
The distance between the first soundproof walls 1 and 4 and the second soundproof wall 9 is not particularly limited as long as there is no problem in changing the positions of the movable parts (opening / closing, rotation, vertical movement, etc.). However, the first soundproof walls 1 and 4 are close to the second soundproof wall 9 (for example, but not limited to, both) because the first soundproof walls 1 and 4 are easily affected by the blast and the scattering of stones near the face. It is preferable that the distance is about 20 to 30 m.

The second soundproof wall 9 closes the tunnel T across the cross section, and is of the type conventionally used alone, as described in, for example, JP-A-2006-283545. Can be used.
Hereinafter, the second soundproof wall 9 will be described in detail.

  FIG. 11 is a front view of the second soundproof wall 9 as seen from the outside of the tunnel T. FIG. As shown in FIG. 11, the second sound barrier 9 is installed in front of the tunnel T1 in close contact with the tunnel T1 of the tunnel T, and closes the tunnel T1 of the tunnel T from the outside of the tunnel T. The second soundproof wall 9 is a wall body having a substantially rectangular shape as a whole, and its wall area is set larger than the opening area of the tunnel mouth T1 of the tunnel T. Since the second soundproof wall 9 is installed not on the inside of the tunnel T but on the outside, it is not necessary to match the shape of the wall body with the cross-sectional shape of the inner peripheral surface of the tunnel T. Therefore, any shape may be used as long as the wellhead T1 of the tunnel T can be closed, and the shape is not limited to a substantially rectangular shape as shown in FIG.

  As shown in FIG. 1 and the like, the second soundproof wall 9 includes a wellhead wall portion 93 installed in front of the wellhead T1 in close contact with the wellhead T1 of the tunnel T being excavated, and the wellhead wall portion 93. And a connecting wall portion 100 that connects the periphery of the well wall portion 93 and the front wall portion 94 to each other. Each of the wall portions 93, 94, 100 is configured by attaching a plurality of small wall members (a weight panel 96 and a sound insulation panel described later) to the framework. The frame is composed of vertical beam members 98 extending in the vertical direction, horizontal beam members 97 extending in the horizontal direction and connecting the vertical beam members 98, and legs for stably standing the second soundproof wall 9 on the ground. It has the part 99 and the brace (not shown) with a turnbuckle.

The well wall portion 93 and the front wall portion 94 are made of heavy objects having a high sound insulation effect in the low frequency sound region. Specifically, the well wall portion 93 and the front wall portion 94 include a plurality of support pillars 95 disposed at predetermined intervals in the wall width direction, and a plurality of sheets having a high sound insulation effect in a low frequency sound range. The weight panels 96 are spanned between the support pillars 95 with their upper and lower edges butting each other.
The weight panel 96 is composed of a hollow box (not shown) formed in a flat rectangular parallelepiped shape and an indefinite shape having a large specific gravity filled in the hollow box. Examples of the “heavy object having a high sound insulation effect in the low-frequency sound range” that are filled in the hollow box include soil, sand, gravel, stone, concrete, porous concrete, liquid such as water, and the like. . Among these, sand and earth are particularly preferable because they are indefinite, contribute to the manufacturing cost reduction of the weight panel 96, and have a high sound insulation effect in a low frequency sound range.

The connecting wall portion 100 is a sound absorbing material made of a sound absorbing material (for example, glass wool) having a high sound insulating effect in a high frequency sound range supported by a support frame and a packed layer in which at least one of a granular material and a liquid is filled in a storage tank. The sound insulation panel (not shown) provided with the material layer is comprised. The plurality of sound insulation panels are incorporated in a predetermined unit frame to constitute a sound insulation panel unit. Since the sound insulation panel unit can be brought into the site, the trouble of attaching the sound insulation panels one by one is omitted on the site.
Further, the second soundproof wall 9 is provided with a double door type soundproof door 90 which can be locked with a hinge 101 and a single door type humanitarian door 91, and equipment and personnel in the tunnel T are provided. Etc. can enter and exit. In addition, a duct hole 92 for allowing a wind pipe (duct) to pass through the second soundproof wall 9 is provided above the soundproof door 90. Similarly to the weight panel 96 described later, the interior of the soundproof door 90 and the humanitarian door 91 may be filled with an indeterminate material having a large specific gravity such as soil, sand, or liquid. Further, the duct panel 92 may be opened and closed by the weight panel 96.

  Since the second soundproof wall 9 configured as described above is installed not in the tunnel T but in front of the wellhead, it should be constructed using a large construction machine (for example, a large crane truck) that cannot be used in the tunnel T. Can do. Moreover, since the well wall portion 93 and the front wall portion 94 are both made of heavy objects having a high sound insulation effect in the low frequency sound region and are installed apart from each other, the low frequency sound region is attenuated twice. In this respect, the soundproofing effect is improved, and in particular, the second soundproof wall 9 having excellent attenuation capability in a low frequency sound range of 2 to 63 Hz can be obtained. Furthermore, the sound leakage from the ceiling side or the side of the second soundproof wall 9 is suppressed by the ceiling wall 100 and the side wall.

  Here, since the first soundproof walls 1 and 4 are provided on the face side from the second soundproof wall 9, the sound pressure of the noise generated on the face side is lowered. The sound insulation is low compared to the case where it is provided alone. Therefore, priority can be given to economic efficiency compared to the case where the second soundproof wall 9 is provided alone. That is, it is possible to reduce the amount of “heavy object having a high sound insulation effect in the low frequency sound range” which is a filling material of the second soundproof wall 9 into the hollow box, and the front wall portion 94 is omitted. Thus, it can be a single sound insulation wall. Therefore, it is possible to reduce the cost by omitting the labor and trouble of transporting and constructing the material constituting the second sound barrier 9 and suppressing the material cost.

9 and 10 show a third embodiment of the soundproof wall of the present invention and another embodiment of the tunnel soundproof system of the present invention. Note that the points not particularly specified are the same as those of the above-described soundproof wall and tunnel soundproof system (in FIG. 10, in order to emphasize the first soundproof wall, the supporting column and the weight panel of the second soundproof wall). The details are omitted).
The first soundproof wall 7 according to this embodiment uses the well wall surface 93 of the second soundproof wall 9 described above as a support. The reflection part 8 of the first soundproof wall 7 is fixed to the well wall surface 93 on the convex surface 82 side. The reflector 81 is bowl-shaped and has a concave parabolic curved reflecting surface 80. The soundproof door 90 also functions as a switching member for the first soundproof wall 7, and the yoke 101 provided outside the tunnel T of the soundproof door 90 also functions as a locking mechanism for the first soundproof wall 7. . As shown in FIG. 10, in the state where the soundproof door 90 is closed, all the reflection portions 8a to 8e are in the front posture. And in the state which opened the said soundproof door 90, the reflection part 8d and the reflection part 8e will be in a horizontal position, and the channel | path which carries out a shear and conveyance of equipment is made.

When the soundproof door 90 is closed and all the reflection portions 8a to 8e of the soundproof wall 7 are in the front posture, the sound waves traveling in the center of the mine collide with the reflection surface 80 of the soundproof wall 7 and are reflected, respectively. Then, the light is diffused toward the wall surface (ceiling surface, bottom surface, side surface) of the tunnel T. In this way, the sound pressure of the sound wave that reaches the second soundproof wall 9 can be significantly reduced compared to when noise is generated on the face side.
Then, the sound wave that reaches the face side from the soundproof wall 7 is absorbed by the heavy object of the weight panel of the second soundproof wall 9 and the sound absorbing material of the sound insulation panel, and the leakage of noise to the outside of the tunnel T tunnel is greatly suppressed. Is done.
This tunnel soundproofing system can be installed in a narrow width, so it is particularly useful when the distance from the face to the wellhead is short, or when you want to install a soundproof wall as far as possible from the face because the blast and blast from the blast are intense. is there.

The reflection surfaces 20.50, 80 are not limited to the above-described shapes as long as they are concave curved surfaces that are recessed from the face side of the tunnel T toward the wellhead T1 side in the front posture. Therefore, for example, the reflecting surface may be formed in a long plate shape that protrudes toward the wellhead T1 and curves in a cross-sectional view cut in the horizontal direction. Moreover, it is good also considering the reflective surface 20 shown in FIGS. 1-4 as a curved surface extended in the up-down direction or the left-right direction of the tunnel T. As shown in FIG.
Further, in the third embodiment, when the reflection portion 8 is provided on the soundproof door 90 of the second soundproof wall 9, each of the soundproof doors 90 is a reflective surface that is a concave rotating paraboloid as in the first embodiment. A reflecting plate obtained by dividing the bowl-shaped reflecting portion having two portions is attached, so that the reflecting portion 8 can be enlarged.

Moreover, in the said embodiment, from the reflection parts 2 and 5 comprised from a pair of reflecting plates 21 and 51 rotatably supported by a pair of support | pillar members 3 and 6 as a switching member, and one reflecting plate 81 Although the reflecting portion 8 is illustrated as an example, the reflecting portion may be constituted by three or more reflecting plates as long as it can withstand the blast at the time of blasting and the arrival of stones. The plate may be supported rotatably.
Further, in order to restrict the rotational movement of the reflecting plates 21 and 41, in addition to or instead of the locking mechanism, two reflecting plates 21 are provided on the convex surfaces 22 and 42 side of the reflecting plates 21 and 41. , 41 may be provided with another lock mechanism for restricting these movements (for example, two reflection plates 21 and 41 are looped so as to be fixed).
Moreover, a stationary type in which the reflecting portion is fixed to the support portion and integrated may be used, or a wheel may be attached to the lower portion of the support portion so as to be movable in and out of the tunnel T tunnel.
Moreover, in the said embodiment, although the 2nd soundproof wall 9 was installed so that the wellhead T1 might be obstruct | occluded, as long as it is located in the wellhead T1 side from the said 1st soundproof walls 1,4,7, it is a face from the wellhead T1. You may provide in the side, ie, a tunnel T tunnel.
Further, the soundproof wall of the present invention can be provided alone in the tunnel T. In this case, for example, the reflection part in which the soundproof wall of the present invention forms a reflection surface constituted by a concave curved surface is configured to block the inside of the tunnel T well across the cross section and switch between the front posture and the horizontal posture. To do.

It is sectional drawing of the soundproofing system for tunnels which is one embodiment of this invention. It is a front view of the sound insulation system for tunnels of FIG. 1 in which the reflection part of the 1st soundproof wall is in a front posture. It is a side view of the soundproof system for tunnels of FIG. 1 in which the reflection part of a 1st soundproof wall is in a horizontal posture. It is a front view of the sound insulation system for tunnels of FIG. 1 in which the reflection part of a 1st soundproof wall is in a horizontal posture. It is sectional drawing which shows the sound insulation system for tunnels of this invention which concerns on another embodiment. It is a front view of the sound insulation system for tunnels of FIG. 5 with the reflection part of a 1st soundproof wall in a front posture. It is a side view of the soundproof system for tunnels of FIG. 5 in which the reflection part of the 1st soundproof wall is in a horizontal posture. It is a front view of the soundproof system for tunnels of FIG. 5 in which the reflection part of the 1st soundproof wall is in a horizontal posture. It is sectional drawing which shows another embodiment of the soundproofing system for tunnels of this invention. It is the front view which looked at the soundproofing system for tunnels of FIG. 9 from the tunnel mine. It is the figure which looked at the 2nd soundproof wall of the soundproofing system for tunnels of this invention from the tunnel exterior.

Explanation of symbols

1,4,7 First sound barrier 2,5,8 Reflector 3,6,90 Post (post member)
9 Second sound barrier 20, 50, 80 Reflecting surface 21, 51, 81 Reflector T Tunnel T1 Wellhead

Claims (5)

A soundproof wall for tunnels installed in the tunnel mine being excavated,
A reflection part formed with a reflection surface constituted by a concave curved surface;
A soundproof wall for a tunnel, comprising: a switching member that switches the posture of the reflecting portion between a front posture in which the reflecting surface faces the face side and a horizontal posture in which the reflecting surface faces the tunnel side surface.   The sound barrier for a tunnel according to claim 1, wherein the switching member includes a support column that rotatably supports the reflecting portion in a horizontal direction. The reflecting portion is composed of a plurality of reflecting plates having a curved surface,
The support column is composed of a plurality of support members that rotatably support the reflecting plate in the horizontal direction.
The soundproof wall for a tunnel according to claim 2, wherein each of the reflectors is arranged so that one concave curved surface is formed when each curved surface faces the face side.   The soundproof wall for a tunnel according to any one of claims 1 to 3, wherein the reflection surface is a paraboloid of revolution whose center direction is the tunnel extension direction in the front posture. A first soundproof wall installed on the face side of the tunnel being excavated, and a second soundproof wall installed on the wellhead side of the first soundproof wall,
The first soundproof wall comprises the soundproof wall for tunnels according to any one of claims 1 to 4, and the second soundproof wall comprises a soundproof wall capable of closing the tunnel across a cross section. Soundproof system.

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