JP5302863B2 - 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 sound absorbing material having a high sound insulation effect has been proposed (for example, see Patent Document 1).
In this noise barrier for tunnels, 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 that supports 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.
In view of this, it has been proposed to install a tunnel soundproof wall formed with a concave curved reflector on the face side of the soundproof wall (see, for example, Patent Document 2). This sound barrier reflects sound waves originating from the blasting etc. performed on the face side to the face side by the reflection surface, thereby reducing the sound wave directed to the face side and reflected waves reflected on the face side and the well side. The reflected wave is attenuated by colliding with the next traveling sound wave.

JP 2006-283545 A JP 2008-308877 A

Since the outer periphery of the tunnel soundproof wall having the reflection plate described above is installed away from the wall surface of the tunnel, a gap exists between the reflection plate and the tunnel wall surface. For this reason, there has been a problem that the soundproof effect cannot be sufficiently exhibited by the sound traveling toward the wellhead passing through the gap and leaking to the wellhead.
This invention is made | formed in view of such a situation, and it aims at providing the soundproof wall for tunnels which can improve a soundproof effect, and the soundproof system for tunnels using the same.

  The soundproof wall for tunnels of the present invention for achieving the above object is a soundproof wall for tunnels installed in a tunnel mine during excavation, and has a main reflection surface in which a concave curved surface is formed on the face side, The main reflection portion disposed away from the ceiling wall surface and the left and right wall surfaces of the tunnel, and the auxiliary reflection surface formed on the substantially same curved surface as the main reflection surface, and the upper end portion of the main reflection portion and the ceiling An upper auxiliary reflecting portion disposed in a gap between the main wall and the auxiliary reflecting surface formed on the substantially same curved surface as the main reflecting surface; and between the left and right side portions of the main reflecting portion and the side wall surfaces. And a lateral auxiliary reflecting portion arranged in a gap between them.

  According to the soundproof wall for tunnels configured as described above, most of the sound wave caused by blasting or the like performed on the face side can be reflected on the face side by the main reflection surface of the main reflection portion. In addition, the sound wave that attempts to pass through the gap between the ceiling wall of the tunnel and the upper end of the main reflecting portion and the gap between the left and right side walls of the tunnel and the left and right sides of the first reflecting portion is supported upward. It can be reflected to the face side by the reflecting portion and the lateral auxiliary reflecting portion. Therefore, it is possible to reduce sound waves that pass through the tunnel soundproof wall and travel toward the wellhead side, and effectively suppress noise from leaking to the outside of the tunnel.

Further, the main reflection portion has a pair of left and right main reflection plates configured by dividing the main reflection surface, and the soundproof wall for the tunnel has the main reflection surface of each main reflection plate facing the face side. It is preferable to further include a switching member capable of switching the posture of the main reflecting portion between a front posture and a horizontal posture facing the side wall surface side of the tunnel in which the main reflecting surface is close.
If comprised in this way, the main reflective surface divided and formed by each main reflector from the front posture in which each main reflector will face the face side from the pair of right and left main reflectors of the main reflector by the switching member. A space can be formed between the left and right main reflectors by switching to a lateral posture toward the side wall surface of each adjacent tunnel. In this way, even if the main reflection portion occupies a large proportion of the cross section of the tunnel when the main reflection portion is in the front posture, the vehicle for carrying the shears and equipment by placing the main reflection portion in the horizontal posture. It is possible to secure a space that becomes a passage such as. In addition, in the horizontal posture, each main reflecting surface faces the side wall surface side of the adjacent tunnel, so that a large space in the left-right direction can be secured as compared with the case where the main reflecting surfaces face each other.

Moreover, it is preferable that a sound absorbing material is attached to a reflection surface of at least one of the main reflection part, the upper auxiliary reflection part, and the lateral auxiliary reflection part.
With this configuration, the sound wave traveling toward the wellhead can be absorbed by the sound absorbing material attached to the reflecting surface of the main reflecting portion, the upper auxiliary reflecting portion, or the lateral auxiliary reflecting portion. The reflected wave is reduced and the sound pressure can be reduced. Therefore, sound leakage to the outside of the mine can be more effectively suppressed.

The soundproof system for a tunnel of the present invention includes a first soundproof wall installed on the face side of a tunnel being excavated, and a second soundproof wall installed on a wellhead side of the first soundproof wall, and the first soundproofing system. The wall is made of a soundproof wall for tunnels according to any one of claims 1 to 3, and the second soundproof wall is made of a soundproof wall capable of closing the tunnel over a transverse section.
According to such a configuration, the first soundproof wall substantially shields the sound wave toward the tunnel entrance and further blocks the sound leaking to the tunnel entrance from the soundproof wall to the tunnel entrance across the cross section. Since another soundproof wall (second soundproof wall) is provided and sound insulation is performed, sound leakage to the outside of the mine can be effectively suppressed.

Moreover, it is preferable that the soundproof system for a tunnel further includes a sound absorbing material installed on at least one wall surface among the ceiling wall surface and the left and right side wall surfaces of the tunnel closer to the face than the second soundproof wall.
According to such a configuration, the reflected wave reflected on the wall surface side of the tunnel by the first soundproof wall or the second soundproof wall can be absorbed by the sound absorbing material installed on the wall surface side. The reflected wave that is reflected is reduced, and the sound pressure can be reduced. Therefore, sound leakage to the outside of the mine can be more effectively suppressed.

  According to the present invention, it is possible to reduce sound waves that pass through the gap between the soundproof wall and the wall surface of the tunnel and go to the wellhead side, and thus effectively suppress noise from leaking outside the tunnel. Can do.

It is a sectional side view 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 top view of the sound insulation system for tunnels of FIG. 1 in which the reflection part of a 1st sound insulation wall exists in a front posture. It is a sectional side view of the sound insulation system for tunnels of FIG. 1 in which the reflection part of a 1st sound insulation wall is a horizontal attitude | position. 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 a top 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 the front view which looked at the 2nd soundproof wall of the soundproofing system for tunnels of this invention from the tunnel exterior.

Embodiments of the present invention will be described below with reference to the drawings.
[Soundproof wall for tunnel]
A tunnel soundproof wall (hereinafter abbreviated as “soundproof wall”) 1 of the present invention shown in FIGS. 1 to 7 is installed in a tunnel T tunnel during excavation, and in particular, noise caused by blasting is generated. Installed to prevent leakage outside the tunnel T.
1 to 6 show a soundproof wall according to an embodiment of the present invention. The soundproof wall 1 is separated from the wall surface of the tunnel T, the main reflection part 2 arranged in the center of the pit, the upper auxiliary reflection part 3 arranged adjacent to the upper part of the main reflection part 2, and the main reflection part 2 And a pair of lateral auxiliary reflectors 4 arranged adjacent to each other on both the left and right sides.

  2 and 3, the main reflecting portion 2 is formed in a long plate shape in the left-right direction of the tunnel T, and is curved so as to protrude toward the wellhead T1 in a sectional view cut in the horizontal direction. A main reflecting surface 20 is formed on the surface of the main reflecting portion 2 facing the face. The main reflecting surface 20 is curved so as to protrude toward the wellhead T1 so that the face side becomes concave in a cross-sectional view cut in the horizontal direction. In the present embodiment, the long plate-shaped main reflecting portion 2 has a pair of left and right main reflecting plates 21 that are equally divided into two in the length direction. The material constituting each main reflector 21 is not particularly limited as long as it has a property of reflecting sound by the main reflection surface 20 on the surface thereof. For example, a metal plate or the like can be used. Further, a layer made of a material having a property of reflecting the sound may be formed on the concave surface of the main reflection plate 21 to form the main reflection surface 20.

  A plurality of sound absorbing materials 24 are attached to each main reflection surface 20 over the entire surface. The sound absorbing material 24 is made of a material (for example, glass wool) having a high sound insulation effect in a high frequency sound region, and has a thickness about three times the thickness of the main reflector 21 (see FIG. 2). In addition, a cylindrical guide portion 23 extending in the vertical direction is formed on the convex surface 22 side of each main reflection plate 21.

The soundproof wall 1 includes a switching member 5 that switches the posture of the main reflecting portion 2. In this embodiment, the switching member 5 is a columnar column member that extends in the vertical direction from the bottom surface in the tunnel T tunnel. The upper end of each column member 5 is fixed to a horizontal beam T2 (for example, made of H steel) extending in the horizontal direction, the other end is fixed to the bottom surface, and an intermediate portion thereof serves as a guide portion 23 of the main reflector 21. It is inserted. Thereby, the main reflecting plate 21 is supported so as to be rotatable in the horizontal direction around the column member 5. The cross beam T2 is curved along the concave curved surface of the main reflecting surface 20 in a cross-sectional view cut in the horizontal direction, and both left and right end portions are formed in an arch shape along the wall surface of the tunnel T. It is fixed to an arch beam T3 (for example, made of H steel) that supports the wall surface.
Furthermore, a lock mechanism (not shown) that locks the rotation of the main reflector 21 is provided across the main reflector 21 and the column member 5.

  1 to 3, the main reflectors 21 supported by the support members 5 are arranged so as to form the main reflection surface 20 with the concave curved surface facing the face of the tunnel T. Yes. Thus, the posture of the main reflecting portion 2 with the main reflecting surface 20 facing the face of the tunnel T is referred to as a “front posture”. Then, as shown in FIGS. 4 to 6, each main reflection plate 21 is rotated about 90 degrees, and the posture in which each main reflection surface 20 faces the side wall surface of the tunnel T is referred to as a “lateral posture”.

  2 and 3, the upper auxiliary reflecting portion 3 is disposed in a gap S <b> 1 formed between the upper end portion of the main reflecting portion 2 and the ceiling wall surface of the tunnel T. Further, the upper auxiliary reflection portion 3 has an auxiliary reflection that is curved so as to protrude toward the wellhead T1 in a sectional view cut in the horizontal direction so as to have a concave curved surface that is substantially the same as the main reflection surface 20 of the main reflection portion 2. A surface 30 is formed. In the present embodiment, the upper auxiliary reflecting portion 3 has an auxiliary reflecting plate 31 formed in a substantially crescent plate shape so as to close the gap S1. The auxiliary reflecting plate 31 is fixed to a frame composed of a plurality of auxiliary vertical beams T4 extending in the vertical direction and the horizontal beams T2 extending in the horizontal direction and connecting the auxiliary vertical beams T4 to each other. In addition, a duct hole 32 for allowing the wind pipe (duct) to pass through the soundproof wall 1 is formed in the auxiliary reflection plate 31. In addition, if the material which comprises the auxiliary | assistant reflecting plate 31 has a property which reflects a sound with the auxiliary | assistant reflective surface 30 of the surface, there will be no restriction | limiting in particular. For example, a metal plate or the like can be used. In addition, the auxiliary reflecting surface 30 can be formed by forming a layer made of a material having a property of reflecting the sound on the concave surface of the auxiliary reflecting plate 31 main body.

  Each of the lateral auxiliary reflecting portions 4 is disposed in a gap S2 formed between the left and right end portions of the main reflecting portion 2 and the left and right side wall surfaces of the tunnel T. The lateral auxiliary reflecting portion 4 is formed with an auxiliary reflecting surface 40 that is curved so as to protrude toward the wellhead T1 so as to have a concave curved surface that is substantially the same as the main reflecting surface 20 of the main reflecting portion 2 (see FIG. 3). . In the present embodiment, the lateral auxiliary reflecting portion 4 has a rectangular auxiliary reflecting plate 41 arranged adjacent to the main reflecting portion 2 and a substantially D-shaped plate shape arranged adjacent to the side wall surface of the tunnel T. It is divided by the fixed plate 42. The auxiliary reflecting plate 41 and the fixed plate 42 close the gap S2.

The auxiliary reflecting surface 41 is formed on the face side of the auxiliary reflecting plate 41. Further, the end of the auxiliary reflecting plate 41 on the fixed plate 42 side is supported by a supporting vertical beam T5 extending in the vertical direction so as to be rotatable in the horizontal direction via a plurality of hinges 43. The rotation of the auxiliary reflector 41 is locked by a lock mechanism (not shown). Thereby, as shown in FIG.5 and FIG.6, if the auxiliary reflector 41 is rotated, a person etc. can go in and out between the wellhead T1 side of the soundproof wall 1 and the face side. In addition, the material which comprises the auxiliary | assistant reflecting plate 41 will not have a restriction | limiting in particular, if it has the property to reflect a sound with the auxiliary | assistant reflective surface 40 of the surface. For example, a metal plate or the like can be used. Alternatively, the auxiliary reflecting surface 40 may be formed by forming a layer made of a material having a property of reflecting the sound on the concave surface of the auxiliary reflecting plate 41 main body.
The fixing plate 42 is fixed to a frame composed of a plurality of auxiliary horizontal beams T6 extending in the horizontal direction and the supporting vertical beams T5 extending in the horizontal direction and connecting the auxiliary horizontal beams T6 to each other.

  The sound generated on the face side by blasting is generated in a wave shape at a plurality of times at intervals, and mainly travels along the tunnel of the tunnel T in parallel with the ceiling wall surface and the left and right side wall surfaces of the tunnel. Therefore, when the rotational movement of the main reflecting plate 21 is restricted by the lock mechanism and the main reflecting portion 2 in the front posture is arranged in the center portion of the mine, the sound wave traveling in the center portion of the mine in the tunnel T extending direction is generated. Then, it collides with the main reflecting surface 20 of the main reflecting portion 2 and is reflected to the face side. At this time, since the sound wave is absorbed by the sound absorbing material 24, the reflected wave reflected by the main reflecting surface 20 is reduced, and the sound pressure can be reduced. For this reason, sound leakage to the outside of the mine can be effectively suppressed.

  Most of the reflected waves reflected by the main reflecting surface 20 are focused on the focal point located in the center of the tunnel T and then diffused toward the wall surface (ceiling wall surface, side wall surface) on the face side of the tunnel T. Also, in the region adjacent to the wall surface in the tunnel of the tunnel T, the sound pressure is likely to decrease or the speed is decreased due to friction with the wall surface. Propagate. Therefore, when the reflected wave is focused near the focal point, when the next sound wave approaches the soundproof wall 1 from the face side, the reflected wave with 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.

In addition, the sound waves that have traveled to the side of the wellhead T1 other than the central portion of the mine, that is, above the main reflection portion 2 and on both the left and right sides due to the blasting, It collides with the auxiliary reflecting surface 30 and the auxiliary reflecting surface 40 of the lateral auxiliary reflecting portion 4 and is reflected to the face side. At this time, since both auxiliary reflecting surfaces 30 and 40 are formed on the substantially same curved surface as the main reflecting surface 20 of the main reflecting portion 2, the reflected waves reflected by the auxiliary reflecting surfaces 30 and 40 are near the focal point. Then, similarly to the reflected wave reflected by the main reflecting surface 20, it is diffused toward the wall surface on the face side of the tunnel T.
Accordingly, since the sound wave traveling outside the region reflected by the main reflecting portion 2 can be reflected to the face side by the upper auxiliary reflecting portion 3 and the lateral auxiliary reflecting portion 4, noise leaks outside the tunnel T. Can be effectively suppressed.

Next, when the reflected waves reflected by the reflecting portions 2 to 4 are diffused toward the wall surface of the tunnel T, they collide with the next sound wave to cancel them, or are absorbed by the sound absorbing material 8 described later, When it collides with a wall surface, it is refracted and attenuated, or the distance attenuation increases because the tunnel T tunnel is inclined. 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 main reflection portion 2 to the cross-sectional area of the tunnel of the tunnel T, 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 main reflection surface 20 having a high ratio of the maximum cross-sectional area of the main reflection portion 2 to the cross-sectional area of the tunnel T tunnel as long as there is no hindrance to transportation, construction, and the like.
Thus, when forming the main reflective surface 20, if the main reflection part 2 is comprised by the some main reflector 21, it will be easy to carry and carry in to the tunnel T tunnel, and to carry out from the tunnel. As shown in FIGS. 4 to 6, the soundproof wall 1 rotates the respective reflecting plates 21 of the main reflecting portion 2 in the horizontal direction so that the main reflecting surface 20 faces the side wall surface of the tunnel T. When it is in the posture, a large space can be formed in the center of the mine between the left and right support members 5. If it does in this way, the passage of vehicles for carrying out shearing and conveyance of equipment can be secured easily. Furthermore, since the reflection surfaces 20, 30, and 40 of the reflection portions 2 to 4 are substantially the same curved surface, the soundproof wall 1 can easily focus the blast and sound pressure due to blasting near the focal point in the central portion of the mine shaft.

[Soundproof system for tunnels]
The tunnel soundproofing system of the present invention will be described below.
As shown in FIG. 1, the soundproof system for a tunnel of the present invention includes a first soundproof wall 1, a sound absorbing material 8 installed on the wall surface of the tunnel T, and a second soundproof wall 9. The above-described tunnel soundproof wall 1 of the present invention is installed on the face side of the tunnel T as a first soundproof wall. As described above, the first soundproof wall 1 suppresses noise from leaking to the wellhead T1 side by reflecting sound waves generated by blasting or the like traveling from the faceside to the wellhead T1 side. .

  A plurality of the sound absorbing materials 8 are attached in the tunnel T extending direction from the first soundproof wall 1 along the ceiling wall surface and the left and right wall surfaces of the tunnel T closer to the face than the first soundproof wall 1. Each sound absorbing material 8 is made of a material (for example, glass wool) having a high sound insulation effect in a high frequency sound region, like the sound absorbing material 24 attached to the main reflecting portion 2. In addition, each sound absorbing material 8 is fixed to the arch beam T3 that is arranged in plural in the extension direction of the tunnel T with a predetermined interval. As a result, the reflected wave that is reflected by the reflecting portions 2 to 4 and diffuses toward the wall surface of the tunnel T as described above can be absorbed by the sound absorbing material 8. Therefore, since the reflected waves reflected by each wall surface of the tunnel T are reduced and the sound pressure can be reduced, sound leakage to the outside of the mine can be further effectively suppressed.

Since the first soundproof wall 1 in the present embodiment does not completely close the tunnel T across the cross section, the sound wave traveling in the direction extending in the tunnel T in the region close to the wall surface of the tunnel T It leaks from the soundproof wall 1 to the wellhead T1 side. Therefore, a second soundproof wall 9 is further installed on the side of the wellhead T1 of the first soundproof wall 1.
The distance between the first soundproof wall 1 and the second soundproof wall 9 is not particularly limited as long as there is no problem in changing the position (opening / closing, rotating) of the movable parts of the two. However, the first sound barrier 1 is located near the second sound barrier 9 (for example, without limitation, the distance between the two is close to the face) because the first sound barrier 1 is easily affected by the blast and stone scattering caused by blasting. It is preferable to install in about 20-30m.

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

  FIG. 7 is a front view of the second soundproof wall 9 as seen from the outside of the tunnel T. FIG. As shown in FIG. 7, 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 can be used as long as the tunnel opening 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 that 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 the wind pipe (duct) to penetrate the second soundproof wall 9 is provided above the soundproof door 90. Similarly to the weight panel 96 to be described later, the interior of the soundproof door 90 and the humanitarian door 91 may be filled with an indeterminate shape 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 T1, it is constructed using a large construction machine (for example, a large crane vehicle) that cannot be used in the tunnel T. be able to. Moreover, since both 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 and are disposed 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, sound leakage from the ceiling wall surface side or the side wall surface side of the second soundproof wall 9 is suppressed by the connecting wall portion 100 and the side wall surface portion.

  Here, since the sound pressure of the noise generated on the face side is reduced by installing the first soundproof wall 1 on the face side of the second soundproof wall 9, the second soundproof wall 9 is required. The sound insulation is lower than that provided by itself. 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 the “heavy object having a high sound insulation effect in the low frequency sound range” which is the filling 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 of carrying and constructing the material constituting the second soundproof wall 9 and suppressing the material cost.

  The main reflection surface 20 and the auxiliary reflection surfaces 30 and 40 are not limited to the shapes described above as long as they are concave curved surfaces that are recessed from the face side of the tunnel T to the wellhead T1 side in the front posture. Therefore, for example, each of the reflecting surfaces 20, 30, and 40 may have a long plate shape that protrudes and curves toward the wellhead T1 side in a sectional view cut in the vertical direction. Further, the main reflection surface 20 may be a curved surface that extends in the vertical direction or the horizontal direction of the tunnel T.

Moreover, in the said embodiment, although the main reflection part 2 comprised from a pair of main reflecting plate 21 rotatably supported by a pair of support | pillar member 5 as a switching member was illustrated, the blast at the time of a blast and the arrival of a stone As long as it can withstand, the main reflecting portion may be constituted by three or more main reflecting plates, and a plurality of main reflecting plates may be rotatably supported by one support member.
In addition, the posture in which each main reflector 21 faces the side wall surface side of the tunnel T is a horizontal posture. However, when the cross-sectional area of the tunnel T is large, the posture in which the respective reflectors 21 face each other may be a horizontal posture. Good.
Further, in order to restrict the rotational movement of the main reflector 21, in addition to or instead of the lock mechanism, the main reflector 21 on the convex surface 22 side extends over the two main reflectors 21. Another locking mechanism that restricts the movement of the main reflection plate 21 may be provided (for example, the two main reflection plates 21 are fixed so as to be fixed).
Moreover, the main reflection part 2 may be a stationary type in which the support part is fixed and integrated, or a wheel may be attached to the lower part of the support part so as to be movable inside and outside the tunnel T tunnel.

Moreover, although each reflecting plate 21 and the auxiliary reflecting plate 41 of the lateral auxiliary reflecting portion 4 are rotated separately, it is also possible to rotate them integrally.
The auxiliary reflector 41 is rotatably supported, but may be fixed.
Moreover, although the horizontal auxiliary reflecting portion 4 is divided into the auxiliary reflecting plate 41 and the fixed plate 42, they may be integrated. In this case, it can be fixed or rotated in an integrated state.

Moreover, although the sound absorbing material 24 installed on the soundproof wall 1 is attached to the main reflecting portion 2, it may be attached to the upper auxiliary reflecting portion 3 or the lateral auxiliary reflecting portion 4.
Moreover, although the sound absorbing material 8 installed on the wall surface of the tunnel T is installed on the face side of the first soundproof wall 1, it may be installed between the first soundproof wall 1 and the second soundproof wall 9. Good. In this case, the sound-absorbing material 8 can absorb the reflected wave that is reflected by the second soundproof wall 9 and directed toward the wall surface of the tunnel T.
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 wall 1, the face side from the wellhead T1, ie, You may provide in a tunnel T tunnel.
Moreover, the 1st soundproof wall 1 of this invention can also be provided in the tunnel T alone. In this case, for example, the main reflection part 2 in which the first soundproof wall 1 forms the concave main reflection surface 20, the upper auxiliary reflection part 3 and the auxiliary auxiliary reflection part 4 in which the auxiliary reflection surfaces 30 and 40 are formed are connected to the tunnel T tunnel. Is configured to be able to be switched between the front posture and the horizontal posture.

DESCRIPTION OF SYMBOLS 1 1st sound barrier 2 Main reflection part 3 Upper auxiliary reflection part 4 Lateral auxiliary reflection part 5 Switching member (support member)
8 Sound Absorbing Material 9 Second Soundproof Wall 20 Main Reflecting Surface 21 Main Reflecting Plate 24 Sound Absorbing Material 30 Auxiliary Reflecting Surface 40 Auxiliary Reflecting Surface S1 Clearance S2 Clearance T Tunnel T1 Wellhead

Claims (5)

A soundproof wall for tunnels installed in the tunnel mine being excavated,
A main reflection portion having a concave curved surface formed on the face side, and a main reflection portion disposed away from the ceiling wall surface and the left and right side wall surfaces of the tunnel;
The upper auxiliary reflecting portion disposed in a gap between the upper end portion of the main reflecting portion and the ceiling wall surface, and having an auxiliary reflecting surface formed on the substantially same curved surface as the main reflecting surface,
A side auxiliary reflecting portion disposed in a gap between the left and right side portions of the main reflecting portion and each side wall surface, and having an auxiliary reflecting surface formed on the substantially same curved surface as the main reflecting surface. A soundproof wall for tunnels. The main reflecting portion has a pair of left and right main reflecting plates configured by dividing the main reflecting surface,
A switching member capable of switching the posture of the main reflecting portion between a front posture in which the main reflecting surface of each main reflecting plate faces the face side and a horizontal posture in which the main reflecting surface faces the side wall surface of the adjacent tunnel. The noise barrier for a tunnel according to claim 1, further comprising:   The soundproof wall for a tunnel according to claim 1 or 2, wherein a sound absorbing material is attached to a reflection surface of at least one of the main reflection portion, the upper auxiliary reflection portion, and the lateral auxiliary reflection portion. 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 said 1st soundproof wall consists of the soundproof wall for tunnels of any one of Claims 1-3, The said 2nd soundproof wall consists of a soundproof wall which can block | close the said tunnel across a cross section. A soundproofing system for tunnels.   5. The tunnel soundproofing system according to claim 4, further comprising a sound absorbing material installed on at least one of the ceiling wall surface and the left and right side wall surfaces of the tunnel closer to the face than the second soundproof wall.

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