JP4320322B2 - Noise barrier for tunnel - Google Patents

Description

  The present invention relates to a noise barrier for a tunnel for reducing noise such as blasting sound in tunnel construction.

When using blasting for excavation in tunnel construction, measures to prevent vibration and noise in neighboring villages have become a major issue. As a countermeasure against noise in such tunnel construction, it is common to install soundproof walls with a thickness of about several tens of centimeters at a plurality of locations on the way from the wellhead to the face.
However, providing soundproof walls at multiple locations inside the tunnel has the disadvantages that the construction of the soundproof wall itself is very uneconomical and that it is inconvenient to carry in and out materials and earth in the tunnel. .
Therefore, for the purpose of obtaining a sufficient soundproofing effect with only one soundproof wall, a space is provided between the wall plate facing the face and the wall plate facing the wellhead side, and sand is filled in this space. A tunnel noise barrier has been proposed (see, for example, Patent Document 1).
Utility Model Registration No. 2561582

  In the conventional tunnel soundproof wall, it is necessary to perform the work of filling sand between the wall plates arranged in the tunnel extending direction inside the tunnel. However, there are restrictions on the size of construction machines that can be used in the work inside such tunnels, and large construction machines such as large cranes cannot be used. Therefore, the conventional tunnel soundproof wall has a drawback that it takes a very long time to construct the soundproof wall.

  In addition, in the case of a soundproof wall in which sand is filled between a pair of front and rear wall plates, the low frequency sound range is attenuated only once, so that a sufficient soundproof effect cannot be obtained depending on the thickness of the sand layer. . Therefore, in order to sufficiently attenuate the low-frequency sound range, it is necessary to increase the distance between the pair of front and rear wall plates to increase the thickness of the sand layer, but this increases the sand filling work in the tunnel. End up. As described above, in the structure of the soundproof wall in which sand is filled between the pair of front and rear wall plates, there is a tradeoff between the construction effort and the soundproof effect in the tunnel. That is, if a high soundproofing effect is to be obtained, the construction work in the tunnel becomes excessive, and if the construction work in the tunnel is reduced, a sufficient soundproofing effect cannot be obtained.

  Furthermore, when the wall plate is installed inside the tunnel, it is difficult to make a close junction with the inner peripheral surface of the tunnel. For this reason, sound may leak from the gap between the inner peripheral surface of the tunnel and the wall plate, and this also causes a decrease in the soundproofing effect.

  In view of the above circumstances, the present invention is such that a soundproof wall having a plurality of wall parts made of heavy objects having a high sound insulation effect in a low frequency sound region is installed in front of the wellhead, and the construction is simple and sufficient soundproof effect. An object of the present invention is to provide a soundproof wall for a tunnel having the following characteristics.

The soundproof wall for a tunnel of the present invention comprises a wellhead wall portion made of a heavy object having a high sound insulation effect in a low frequency sound range installed in front of a wellhead so as to close the wellhead in close contact with the wellhead of a tunnel being excavated. ,
A front wall portion made of a heavy object having a high sound insulation effect in a low-frequency sound range installed away from the tunnel extension direction outside with respect to the wellhead wall portion,
A connecting wall portion for connecting peripheral edges of the well wall portion and the front wall portion to each other;
Equipped with a,
The connecting wall portion includes a ceiling wall portion that connects the ceiling edges of the wellhead wall portion and the front wall portion to each other, and a side wall portion that connects the side edge portions of the wellhead wall portion and the front wall portion to each other. It is characterized by becoming .

  Since the tunnel noise barrier is installed not in the tunnel but in front of the wellhead, it can be constructed using a large construction machine (such as a large crane truck) that could not be used in the tunnel. In addition, the well wall and the front wall are both made of heavy objects having a high sound insulation effect in the low-frequency sound region and are placed apart from each other, so that the low-frequency sound region is attenuated at least twice. The soundproofing effect is improved in terms. Furthermore, since the connecting wall portion is provided, sound leakage from the soundproof wall periphery is suppressed.

  In the tunnel soundproof wall, the well wall and the front wall are formed of a plurality of support pillars arranged 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. It is preferable that each weight panel is spanned between the support columns in a state in which the upper and lower edges are abutted with each other. In this case, since the cross beam for supporting the load of the heavy panel is not necessary, the frame components of the well wall and the front wall can be reduced. Further, since the gap between the upper and lower edges of the heavy panel is minimized, sound leakage from the gap can be suppressed, and the soundproofing effect is further enhanced.

In the soundproof wall for a tunnel, the support column is made of a steel material having slide grooves extending along the vertical direction on both sides in the wall width direction, and both edges of the weight panel can be slid freely in the slide grooves of the adjacent support columns. It is preferable that the weight panel is spanned between the supporting columns by fitting.
In this case, the wellhead wall portion and the front wall portion can be constructed by simply inserting the weight panels lifted by a crane or the like between the support columns sequentially from above.

  The said weight panel is good also as a request | requirement structure which consists of a hollow box formed in the shape of a flat rectangular parallelepiped, and an indeterminate thing with large specific gravity, such as soil, sand, or a liquid with which this hollow box was filled. In this case, for example, material costs can be reduced compared to a heavy panel made of concrete blocks.

  The connecting wall portion is constituted by a sound insulation panel including a filling layer in which at least one of a granular material and a liquid is filled in a storage tank, and a sound absorbing material layer made of a sound absorbing material supported by a support frame, The sound insulation panel may have a structure in which the storage tank and the support frame are integrated. In this case, the sound insulation panel used for the connecting wall portion can be made low cost and excellent in durability.

  Since the soundproof wall having a plurality of walls made of heavy objects having a high sound insulation effect in the low frequency sound range is installed in front of the wellhead, it is easy to construct and provides a soundproof wall for a tunnel that exhibits a sufficient soundproof effect be able to.

Embodiments of the present invention will be described below with reference to the drawings.
In the following drawings, the cross section of the thin portion is indicated by a simple line as appropriate.
FIG. 1 is a front view of a tunnel soundproof wall 1 according to an embodiment of the present invention, and FIG. 2 is a side view thereof. As shown in FIG. 2, the tunnel soundproof wall 1 is not installed inside the tunnel t (indicated by a virtual line in FIG. 2), but is installed so as to close the tunnel t1 of the tunnel t from the outside of the tunnel t. ing. That is, the tunnel soundproof wall 1 is installed in front of the tunnel entrance t1 in close contact with the tunnel entrance t1. FIG. 1 is a front view of the tunnel soundproof wall 1 as viewed from the outside of the tunnel, and the tunnel well t1 located on the back side of the tunnel soundproof wall 1 is indicated by a virtual line.

  As shown in FIG. 1, the tunnel soundproof wall 1 is a wall body having a substantially rectangular shape as a whole, and its wall area is larger than the opening area of the tunnel well t1. The tunnel soundproof wall 1 is installed not on the inside of the tunnel t but on the outside, so that the shape of the wall body does not need to coincide with the sectional shape of the inner peripheral surface of the tunnel. The tunnel soundproof wall 1 may have any shape as long as it can block the tunnel entrance t1, and is not limited to a substantially rectangular shape as shown in FIG.

  Further, the tunnel soundproof wall 1 is provided with a double door type soundproof door 20 and a humane door 21 so that equipment, personnel, etc. can enter and leave the tunnel t. Similarly to the weight panel 7 to be described later, the interior of the soundproof door 20 and the humanitarian door 21 may be filled with an indeterminate shape having a large specific gravity such as soil, sand, or liquid. A duct hole 22 is provided on the upper side of the soundproof door 20 to allow a wind pipe (duct) (not shown) to penetrate the tunnel soundproof wall 1.

  3 is a cross-sectional view taken along line ZZ in FIG. 1, and FIG. 4 is a cross-sectional view taken along line YY in FIG. As shown in FIGS. 3 and 4, the tunnel soundproof wall 1 has a substantially rectangular wellhead wall portion 2 and a front wall portion 3 that face each other with a space k therebetween, and each of the wall portions 2 and 3. The peripheral portions of the two are connected to each other to constitute a substantially rectangular wall body having a hollow structure as a whole.

  The connecting wall portion that connects the peripheral edges of the wellhead wall portion 2 and the front wall portion 3 includes a ceiling wall portion 4 and a side wall portion 5. The ceiling wall 4 connects the ceiling edges of the wellhead wall 2 and the front wall 3 to each other, and the side wall 5 connects the side edges of the wellwall 2 and the front wall 3 to each other. Yes.

  The tunnel soundproof wall 1 is configured by attaching a plurality of plate-like members to a framework h mainly made of a steel frame. FIG. 5 is a front view showing the framework h of the tunnel soundproof wall 1, and FIG. 6 is a side view of the framework h. Each of the wall portions 2, 3, 4, and 5 is configured by attaching a plurality of small wall members (a weight panel 7 and a sound insulation panel p described later) to the frame h. The frame h includes a vertical beam member (including a support column 6 described later) 10 extending in the vertical direction, a horizontal beam member 11 extending in the horizontal direction and connecting the vertical beam members 10 to each other, and the tunnel noise barrier 1 on the ground. It has a leg 12 for standing up stably and a brace 13 with a turnbuckle.

  The well wall portion 2 and the front wall portion 3 include a plurality of support pillars 6 arranged at predetermined intervals in the wall width direction, and a plurality of weight panels 7 having a high sound insulation effect in a low-frequency sound range. ing. As shown in FIG. 4, the support column 6 is made of H steel (H-shaped steel) and is oriented so that both grooves m1 and m2 of the H steel are located on both sides of the tunnel soundproof wall 1 in the wall width direction. Therefore, both the steel steel grooves m1 and m2 constituting the support column 6 constitute slide grooves 61 and 62 which extend along the vertical direction and into which the weight panel 7 can be slid. That is, a pair of slide grooves facing each other is formed by two support columns 6 adjacent to each other. The weight panel 7 is bridged between the support columns 6 by fitting both edges of the weight panel 7 to the slide grooves 61 and 62 of the adjacent support columns 6 so as to be slidable. As shown in FIG. 3, a plurality of weight panels 7 are slidably fitted into the same slide grooves 61 and 62 while being stacked in the vertical direction. As a result, the weight panels 7 inserted in the same slide grooves 61 and 62 are bridged between the support columns 6 with their upper and lower edges 7e butting each other.

The weight panel 7 includes a hollow box 71 formed in a flat rectangular parallelepiped shape, and sand 72 filled in the hollow box 71. Both surfaces of the hollow box 71 in the wall thickness direction are made of thin metal plates having substantially corrugated irregularities. The filling material in the hollow box 71 is not limited to the sand 72 but may be soil, water, or the like. As a result of using this weight panel 7, the well wall 2 and the front wall 3 are made of heavy objects having a high sound insulation effect in the low frequency sound range.
Examples of the “heavy object having a high sound insulation effect in the low frequency sound region” 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 7 and have a high sound insulation effect in a low frequency sound range.

The state of the slide fitting between the support column 6 and the weight panel 7 will be described in more detail.
7 is an enlarged cross-sectional view of the portion (A) in FIG. 4, FIG. 8 is an enlarged cross-sectional view of the portion (B), and FIG. 9 is an enlarged cross-sectional view of the portion (C).
As shown in FIG. 8 (part (b) in FIG. 4), both edges (both edges in the left-right direction) of the weight panel 7 are made of H steel grooves m1 and m2 (slide grooves 61) constituting the support pillar 6. , 62) is slidably fitted. In order to ensure this slidability, the width W6 of the slide grooves 61 and 62 is larger than the maximum thickness W7 at both edges of the weight panel 7. Further, by making the width W6 larger than the width W7 as described above, the weight panel 7 after the slide fitting is vibrated in the slide grooves 61 and 62, or both ends of the weight panel 7 and the slide grooves 61 and 62 are In order to suppress these noises, the support column 6 is provided with a fixing screw 64 for pressing the weight panel 7 against the slide groove and fixing it. The fixing screw 64 presses the panel frame portion 73 constituting the peripheral portion of the weight panel 7 from one side in the panel thickness direction of the weight panel 7 toward the other side. The fixing screw 64 suppresses vibration of the weight panel 7 and suppresses sound leakage from the gap between the support column 6 and the weight panel 7, further enhancing the soundproofing effect of the tunnel soundproof wall 1.
A cushioning material 25 made of a flexible material such as glass wool or rubber is provided at a portion of the both edges of the weight panel 7 that is pressed against the slide grooves 61 and 62 by the fixing screw 64, whereby a tunnel material is used. Sound leakage from the inside of the soundproof wall 1 is further suppressed.

  Further, as shown in FIG. 9 (enlarged view of (c) portion of FIG. 4), the support pillar 6 is a support pillar 6 to which a material having a groove 63 such as a C-type channel member 65 is attached. Further, both end portions of the weight panel 7 may be slidably fitted.

  The ceiling wall part 4 and the side wall part 5 are constituted by a sound insulation panel p having a sound absorbing material layer and a filling layer. As shown in FIG. 2, the side wall portion 5 is configured by continuously abutting a plurality of sound insulation panels p. This also applies to the ceiling wall portion 4 (not shown).

Next, an engagement structure between the sound insulation panel p constituting the ceiling wall portion 4 and the side wall portion 5 and the framework h of the tunnel soundproof wall 1 will be described.
First, the engagement structure between the sound insulation panel p and the frame h constituting the side wall portion 5 is shown in FIG. 7 (enlarged view of the portion (a) in FIG. 4). As shown in the figure, L-shaped angle members 26 are attached to support pillars 6 located at both ends in the wall width direction of the wellhead wall portion 2 and the front wall portion 3, and project from the outer peripheral edge portion of the sound insulation panel p. The protrusion p1 and the L-shaped angle member 26 are fixed by screws with bolts b. The L-shaped angle member 26 is attached to the support column 6 with one side 26a contacting the outer surface of the support column 6 out of the two sides constituting the L-shaped cross section, and the other side (projecting side) of the two sides. ) 26b is attached so as to protrude outward of the soundproof wall 1 for tunnel. Further, the protruding portion p1 to be bolted to the protruding side also protrudes outward of the tunnel soundproof wall 1 in a state where the sound insulating panel p is attached to the tunnel soundproof wall 1 as the side wall portion 5. It is attached. Thus, the sound insulation panel p (projection part p1) is attached from the outer side of the sound insulation wall 1 for tunnel, and the attachment work of the sound insulation panel p is made easy.

  As shown in FIG. 2, the sound insulation panel p comprises a sound insulation panel unit p2 formed by incorporating a plurality of sound insulation panels p (five in the embodiment of FIG. 2) into a predetermined unit frame 27. The sound insulation panel unit p2 is brought into the field. Therefore, the trouble of attaching the sound insulation panels p one by one at the site is omitted. In addition, this unit frame is reinforced by the brace 27a provided in the diagonal form, and the intensity | strength of the noise barrier 1 for tunnels is raised by this.

Then, the engagement structure of the sound insulation panel p which comprises the ceiling wall part 4 and the framework h of the soundproof wall 1 for tunnels is demonstrated.
As shown in FIG. 10 (enlarged view of the (d) portion in FIG. 3), the support column 6 is moved to the left and right by bolts b at the upper end portion of the support column 6 constituting the well wall 2 and the front wall 3. A C-shaped channel material 28 is attached so as to cross. The C-type channel material 28 is attached so that a groove 28m constituted by the C-shaped cross section is opened to the outside of the tunnel soundproof wall 1, and as a result, one wall surface of the C-type channel material 28 protruding. 28a and the projection part p1 of the sound insulation panel p mentioned above are bolted. Moreover, the sound insulation panel unit p2 is used also for the ceiling wall part 4 like the side wall part 5 mentioned above, and the installation work of the sound insulation panel p is simplified.

  As described above, in the ceiling wall portion 4 and the side wall portion 5, the engaging portion between the frame h of the tunnel soundproof wall 1 and the sound insulation panel p is provided outside the tunnel soundproof wall 1. It can be attached from the outside of the tunnel soundproof wall 1, and the attachment workability is good. Moreover, the sound insulation panel p which comprises the ceiling wall part 4 and the side wall part 5 does not need to be attached so that it may carry out slide lamination | stacking. That is, the sound insulation panel p constituting the side wall portion 5 can be attached to the tunnel sound insulation wall 1 from the side surface side of the tunnel sound insulation wall 1, and the sound insulation panel p constituting the ceiling wall portion 4 is attached to the tunnel sound insulation wall 1. Can be attached from the top side. Therefore, the installation work of the sound insulation panel p is simplified.

Next, the sound insulation panel p which comprises the ceiling wall part 4 and the side wall part 5 is demonstrated in detail.
FIG. 11 is a perspective view of the sound insulation panel p viewed from the front side, and FIG. 12 is a partial cross-sectional perspective view of the sound insulation panel p viewed from the back side. The sound insulation panel p is formed by connecting two divided panels, a first divided panel pR and a second divided panel pL, and FIG. 13 is a perspective view showing a connection state between these divided panels. . Note that FIG. 13 does not show a granular material or liquid filled in a sound absorbing material p7 or a packed bed p5 described later.

  In the following description, with respect to the thickness direction of the sound insulation panel p, the side on which the sound absorbing material p7 is provided is the front side F, and the side on which the filling layer p5 is provided is the back side B. In addition, a direction parallel to the short side of the sound insulation panel p having a substantially rectangular shape is referred to as a short side direction, and a direction parallel to the long side is referred to as a long side direction.

  The sound insulation panel p includes a filling layer p5 in which at least one of a granular material and a liquid is filled in the storage tank p3, and a sound absorbing material layer p8 made of the sound absorbing material p7 supported by the support frame p6. As shown in FIGS. 11 to 13, the support frame p <b> 6 has a rectangular frame shape, and is provided integrally with the storage tank p <b> 3 on the front side F of the storage tank p <b> 3. Further, the support frame p6 is arranged slightly shifted to one side in the short side direction with respect to the storage tank p3. Due to this deviation, the one side stepped portion pX and the other side stepped portion pY, which are alternately uneven, are formed on both edges of the long side of the sound insulation panel p. And in the ceiling wall part 4 and the side wall part 5 of the soundproof wall 1 for tunnels, the sound insulation panels p are arranged side by side in the short side direction, and one side step part pX of the one sound insulation panel p and the other. The other side step portion pY of the sound insulation panel p is engaged with each other. Thereby, while the assembly state of the sound insulation panel p is stabilized, the clearance gap between adjacent sound insulation panels p is suppressed, and the sound leakage from the said clearance gap is suppressed.

  For example, glass wool is filled in the frame of the support frame p6 as the sound absorbing material p7. This glass wool is exposed from the opening part p30 formed in the front side F of the support frame p6. The exposed glass wool is pressed against the inner side of the sound insulation panel p by the frame p34 constituting the peripheral edge of the support frame p6 and a plurality of auxiliary frames p38 provided to connect the frames p34 located on opposite sides of each other. It has been. In the present embodiment, four auxiliary frames p38 are arranged at a predetermined interval in the longitudinal direction of the sound insulation panel p, and the strength of the support frame 6 is ensured and glass wool as the sound absorbing material p7 is supported. Jumping out from the opening p30 of the frame p6 to the front side F is prevented.

In the ceiling wall part 4 and the side wall part 5 of the soundproof wall 1 for tunnel, the front side F of the sound insulation panel p (that is, the side where the sound absorbing material p7 is exposed) is set to the inner side of the soundproof wall 1 for tunnel. The rear side B is the outside of the tunnel soundproof wall 1. In this way, by installing the sound insulation panel p with the sound absorbing material p7 facing the inside of the tunnel soundproof wall 1, and exposing the sound absorbing material p7 to the inside, the soundproof wall for tunnel passing through the wellhead wall 2 is provided. Since the sound that has entered the interior of 1 directly collides with the sound absorbing material p7 and is attenuated, the soundproofing effect is enhanced.
The sound absorbing material here refers to a material that can attenuate sound. For example, even a material called a sound insulating material, a sound insulating material, or a heat insulating material is included in the sound absorbing material as long as it attenuates sound.

As shown in FIG. 11, a water injection part p21 for injecting a filling material p4 (at least one of liquid and granular material) into the storage tank p3 is provided in the upper part of the side surface of the storage tank p3. A drainage part p22 for discharging the filling p4 inside the storage tank p3 is provided. Moreover, although illustration is abbreviate | omitted, the inside of the storage tank p3 is partitioned off by the reinforcement rib as an internal wall provided in the predetermined space | interval, thereby improving the rigidity of the storage tank p3 and the sound insulation panel p. . The reinforcing rib is provided with a flow hole (not shown), and the filler (for example, water or sand) injected from the water injection part p21 described above reaches the entire storage tank p3. Yes. Further, on the outer surface of the storage tank p3, small ribs p17 for securing the rigidity and strength of the storage tank p3 are provided in a lattice shape.
The interior of the storage tank p3 may be filled only with a granular material such as sand, or may be filled only with a liquid such as water, and both the granular material and the liquid (for example, both sand and water). ) May be filled.

  As described above, the sound insulating panel p is formed by connecting two divided panels, the first divided panel pR and the second divided panel pL. With such a divided structure, a large sound insulation panel p can be easily manufactured.

  FIG. 13 is a perspective view showing a connection state between these divided panels pR and pL. The sound insulation panel p includes a connection member p9 that connects adjacent divided panels pR and pL to each other. This connection member p9 includes a cylindrical tank connection member p9A fitted in the central portion in the longitudinal direction of the storage tank p3 and a connection for a frame having a C-shaped steel section provided in the central portion in the longitudinal direction of the support frame p6. It is comprised from the member p9B (refer FIG. 13). Although the storage tank p3 has a hollow rectangular shape made of resin, the tank connection member p9A described above includes the storage tank p3 component of the first split panel pR and the storage tank p3 component of the second split panel pL. Are connected in a watertight manner. Further, the frame connection member p9B is fitted into both the groove portions p43 of the frame p34 component of the first divided panel pR and the frame p34 component of the second divided panel pL, thereby connecting the frame p34 components. Yes.

  The tunnel soundproof wall 1 configured as described above is installed in front of the wellhead, not in the tunnel t. Therefore, the construction is performed using a large construction machine (for example, a large crane vehicle) that cannot be used in the tunnel t. can do. In addition, the well wall portion 2 and the front wall portion 3 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, so that the low frequency sound region is attenuated twice. In this respect, the soundproofing effect is improved. That is, as can be seen from the cross-sectional view of FIG. 3, sound such as a blast generated in the tunnel t first passes through the well wall 2 and then the space between the well wall 2 and the front wall 3. k and then pass through the front wall 3. Therefore, the first low-frequency sound range is attenuated by the well wall 2 and the second low-frequency sound range is attenuated by the front wall 3, so that the low-frequency sound range is attenuated twice. . As described above, the low-frequency sound range can be attenuated a plurality of times even though it is the single sound-proof wall 1 for tunnels. Therefore, the sound-proofing effect in the low-frequency sound range is excellent, and particularly in the low-frequency sound range attenuation ability of 2 to 63 Hz. It can be set as the excellent soundproof wall 1 for tunnels. Further, the ceiling wall portion 4 and the side wall portion 5 suppress sound leakage from the ceiling side or side surface side of the tunnel soundproof wall 1.

  In the above-described embodiment, it is preferable to further provide a wind pipe soundproofing opening / closing body made of a heavy object that can close the duct hole (wind pipe hole) 22 and has a high sound insulation effect in a low frequency sound region. In this case, by closing the wind pipe soundproofing opening / closing member and closing the duct hole 22, the sound passing through the duct hole 22 can be attenuated, and the soundproofing effect of the tunnel soundproof wall is further enhanced. Further, the wind pipe soundproof opening / closing body is preferably provided on both the well wall 2 and the front wall 3. That is, the wind pipe soundproofing opening / closing body is preferably provided in both the duct hole 22 on the well wall side and the duct hole 22 on the front wall 3 side. In this way, the wind pipe soundproofing opening / closing bodies installed apart from each other attenuate the low frequency sound range in the sound passing through the duct hole at least twice, and the soundproofing effect is further improved in this respect.

  FIG. 14 is a front view of the duct hole opening / closing soundproof door unit 8 which is an example of the wind pipe soundproofing opening / closing body described above. The duct hole slide door unit 8 includes a slide door frame 81 and a soundproof slide door 82 having a caster 83 attached to the slide door frame 81 so as to be slidable. FIG. 15 is a front view of the slide door frame 81, and FIG. 16 is a front view of the soundproof slide door 82.

  FIG. 17 is a front view of a frame h2 for a tunnel soundproof wall provided with the duct hole slide door unit 8, and FIG. 18 is a side view of the frame h2. The structure of the frame h2 is the same as that of the frame h shown in FIGS. 5 and 6 described above except that the position of the duct hole mounting portion h22 is positioned at the center in the wall width direction of the tunnel soundproof wall. Therefore, portions similar to the framework h are denoted by the same reference numerals as the framework h and description thereof is omitted. A weight panel and a sound insulation panel are attached to the frame h2 in the same manner as the frame h described above, and a tunnel soundproof wall having a wellhead wall portion, a front wall portion, a ceiling wall portion, and a side wall portion is configured (illustration shown). (Omitted). In FIG. 18, the duct hole slide door unit 8, the duct (wind pipe) d, and the like are also illustrated for easy understanding.

  In the tunnel soundproof wall 1 described above, the duct hole 22 is provided in the frame h, but in the present embodiment, the duct hole 22 is provided in the sliding door frame 81 (see FIG. 15). The duct hole slide door unit 8 is attached to the frame h2 while the center position of the duct hole 22 is matched with the center position in the wall width direction of the duct hole attachment portion h22 of the frame h2. The duct hole slide door unit 8 is attached to the frame h2 from the outside of the frame h2 with bolts or the like, and is attached to both the well wall side and the front wall side (see FIG. 18). The duct hole 22 on the well wall side and the duct hole 22 on the front wall side are communicated with each other by a duct hole communicating portion 90.

  The sliding door frame 81 includes a frame portion 81a that forms a substantially rectangular frame, and a plurality of beam bodies 86 that are provided so as to connect opposite sides of the frame portion 81a. The beam body 86 reinforces the slide door frame body 81 and is bolted to the frame h2 at the protruding portion 86t that protrudes outside the slide door frame body 81, whereby the slide door frame body 81 and the frame h2 It plays the role of linking.

  As shown in FIG. 16, the soundproof slide door 82 includes a door through hole 84 and a sound insulation portion 85 made of a heavy object having a high sound insulation effect in a low frequency sound range. The door through hole 84 is a hole having substantially the same shape as the duct hole 22. On the other hand, the sound insulating portion 85 has an area capable of closing the duct hole 22. The soundproof slide door 82 and the slide door frame 81 are appropriately provided with a reinforcing beam hk to reinforce the opening through the door through hole 84 and the duct hole 22.

  FIG. 19 is a cross-sectional view of the sound insulation portion 85 of the soundproof slide door 82. In FIG. 19, the rail r provided on the slide door frame 81 side is also illustrated for easy understanding. The sound insulation portion 85 constitutes a flat hollow box, and is filled with sand 72. The thickness of the hollow portion of the hollow box (that is, the thickness of the sand 72) is about 150 mm. In addition, the filler with which the sound insulation part 85 is filled is not restricted to sand, and this point is exactly the same as the filler for the weight panel 7 described above.

  As shown in FIG. 19, the sound insulation portion 85 includes a first flat plate 85a and a second flat plate 85b facing each other with a predetermined interval, and a grooved steel 85c interposed between the first flat plate 85a and the second flat plate 85b. have. The first flat plate 85a and the grooved steel 85c are welded to each other, and the second flat plate 85b and the grooved steel 85c are bolted to each other. And the hollow part of the sound insulation part 85 is divided | segmented into plurality (9 in this Embodiment) by the groove type steel 85c (refer FIG. 14, FIG. 16). The grooved steel 85c serves to connect the first flat plate 85a and the second flat plate 85b and to increase the rigidity of the sound insulating portion 85. By providing a reinforcing body such as the grooved steel 85c inside the sound insulating portion 85, the strength and rigidity of the large sound insulating portion 85 can be ensured.

  A method of filling the inside of the sound insulating portion 85 with a filler such as sand is as follows. First, the first flat plate 85a is placed in a horizontal state so that the first flat plate 85a to which the grooved steel 85c is attached becomes the bottom surface, and then a filler such as sand is placed on the first flat plate 85a. Two flat plates 85b and groove steel 85c are bolted.

  The soundproof slide door 82 can be slid in the left-right direction (the wall width direction of the tunnel soundproof wall) in the slide door frame 81. A rail r is laid on the lower side of the frame portion 81 a of the slide door frame 81 (see FIGS. 18 and 19), and the soundproof slide door 82 can move on the rail r via the caster 83. . Rope 87 for moving the soundproof slide door 82 is attached to both ends of the soundproof slide door 82 in the left-right direction (wall width direction). The soundproof slide door 82 can be moved to the one end portion side by pulling the first rope 87a attached to the one end portion 821 of the soundproof slide door 82 in the left-right direction. By pulling the second rope 87b attached to the other end portion 822, the soundproof slide door 82 can be moved to the other end portion side. These ropes 87a and 87b hang down to the ground while being wound around a plurality of rollers 88, so that the worker can open and close the soundproof slide door 82 while staying on the ground surface.

  When air is passed through the duct d, the door through hole 84 of the soundproof slide door 82 is made to coincide with the position of the duct hole 22 (ie, the state shown in FIG. 14). Further, when it is desired to reduce noise, for example, when performing a blasting operation, the positional relationship is set such that the sound insulating portion 85 of the soundproof sliding door 82 blocks the duct hole 22. At this time, the sound insulation portion 85 blocks the duct hole 22 in both the soundproof slide door 82 on the well wall side and the soundproof slide door 82 on the front wall portion side. In this way, the soundproofing effect can be further enhanced.

  Further, as the wind pipe soundproof opening / closing body, a rotary soundproof door can be adopted instead of the sliding soundproof door. FIG. 20 is a side view of a framework in a soundproof wall for a tunnel including such a rotating soundproof door, and corresponds to FIG. 18 described above. Therefore, common elements are denoted by the same reference numerals, and description thereof is omitted for simplicity.

  In the embodiment shown in FIG. 20 (third embodiment), the duct hole including the soundproof slide door 82 respectively disposed on the well wall side and the front wall side in the embodiment shown in FIG. Instead of the sliding door unit 8, the rotary soundproof door 100 is disposed in a duct communication portion 190 that connects the well wall portion side duct d and the front wall portion side duct d. The duct communication portion 190 is made of a steel plate and an appropriate reinforcing material, and has a rectangular (square) cross section, unlike the duct hole communication portion 90 of FIG. 18 having a circular cross section. For this reason, in order to connect to the duct d having a circular cross section, the opening at both ends to which the duct d is connected is a rectangular (square) steel plate having the same size as the cross section of the duct communication portion 190 and has a duct in the center. A connection plate (not shown) in which a hole having the same size as the circular cross section of d is formed is disposed. The duct d is welded to the connection plate so as to be concentric with the hole of the connection plate.

  As shown in FIG. 24, the soundproof door 100 includes two rectangular steel plates 101a and 101b facing each other at a predetermined interval, and a grooved steel 102 interposed therebetween. Moreover, the edge part 103 which consists of a elongate material with a semicircular cross section is arrange | positioned at the both-sides edge of the said steel plates 101a and 101b arrange | positioned facing. The edge 103 can be obtained by dividing a steel pipe having a predetermined length into two along the longitudinal direction.

  In the present embodiment, the groove steels 102 are arranged along the vertical direction (vertical direction in FIG. 24A) and four along the horizontal direction. A total of 12 hollow portions are formed by the two steel plates 101a and 101b. And this hollow part is filled with sand like the sound insulation part 85 of the soundproof slide door 82. The sand is made by placing the steel plate 101a in a horizontal state so that the steel plate 101a to which the groove steel 102 and the edge 103 are attached becomes the bottom surface, and then the groove steel 102 arranged on the steel plate 101a, that is, in a lattice shape. By supplying sand into the divided 12 spaces and finally welding the steel plate 101b to the groove steel 102 and the edge portion 103, the hollow portion can be filled.

  In addition, a rotation shaft 104 for rotating the soundproof door 100 is fixed at a substantially center of the soundproof door 100 so as to penetrate vertically. The rotating shaft 104 is made of a steel bar or the like, and as shown in FIG. 21, the upper and lower walls of the wall composing the duct communication portion 190 are freely rotatable via bearings (not shown). It is supported. The lower end portion of the rotary shaft 104 extends further downward through the wall below the duct communication portion 190, and the lower end of the extended portion has the rotary shaft 104, that is, the soundproofing. A handle 106 for rotating the door 100 is fixed.

  As shown in FIG. 22, the handle 106 includes a base portion 106a fixed to the rotary shaft 104 of the soundproof door 100 and an arm portion 106b having one end fixed to the base portion 106a. A rope 107 is attached in the vicinity of the other end of the arm portion 106b. The rope 107 hangs down to the vicinity of the ground while being guided by the eyebolt 108 and the guide roller 109. The worker can open or close the soundproof door 100 by pulling the left and right ropes 107 (left and right in FIGS. 21 to 22) to rotate the arm portion 106b. This rope operation can be operated automatically rather than manually by collecting the end portions that give a tensile force to the rope in one place. Moreover, it can replace with a rope and can also use other stress transmission means, such as a wire.

  FIG. 23 is a cross-sectional view taken along line BB in FIG. 21. In FIG. 23, the vertical direction is the axial direction of the duct communication portion 190, in other words, the air flow direction into the tunnel. The soundproof door 100 is in an “open” state as shown by a solid line, and can be supplied into the tunnel through air through the duct d. On the other hand, when it is desired to reduce the noise outside the tunnel, such as when performing a blasting operation, the soundproof door 100 can be brought into a “closed” state indicated by a one-dot chain line by the rope operation described above.

  As shown in FIG. 23, four stoppers 110 made of angle steel are provided at equal intervals along the rotation direction of the soundproof door 100 inside the duct communication portion 190. The stoppers 110 have the same length as the distance between the inner surfaces of the upper and lower wall bodies of the duct communication portion 190. Of the four stoppers, the upper and lower two in FIG. Is a stopper for closing. The stopper 110 positions the soundproof door 100 in the open state or the closed state, but in addition, the stopper for closing is in contact with the vicinity of both side edges of the soundproof door 100 so that the soundproof door 100 is positioned. It also has a sealing function. That is, in order to ensure smooth rotation, it is necessary to provide a slight clearance between the tip of the edge portion 103 of the soundproof door 100 and the inner surfaces 190a of the left and right wall bodies of the duct communication portion 190 (FIG. 23). Then, in order to make it easy to understand, the clearance is drawn slightly exaggerated). If this clearance exists, sound leaks from there, and the noise prevention effect is reduced. Therefore, a stopper is provided along the edge of the soundproof door 100 to seal the edge of the soundproof door 100.

In the present embodiment, a rectangular (square) rotary soundproof door is adopted, but a rotary soundproof door having another shape such as a circle can also be used.
Further, in the above-described embodiment, the anti-mouth wall portion and the front wall portion are constituted by weight panels filled with sand inside, and the connecting wall portion that connects the anti-mouth wall portion and the front wall portion is filled. However, the present invention is not limited to this. For example, the anti-oral wall portion and the front wall portion are provided with a filling layer (in this filling layer). Can be made into a two-layer structure of a sound absorbing material layer filled with a heavy object having a high sound insulation effect in a low frequency sound region. Furthermore, the connection wall portion can be formed of a weight panel similar to the anti-progression wall portion and the front wall portion. And the sound absorbing material layer has a high sound absorbing effect in the high frequency sound range, while the weight panel has a high sound insulating effect in the low frequency sound range, and if the thickness is comparable, the sound absorbing effect as a whole is better than the sound absorbing material layer. In consideration of the high quality, the panel structure can be appropriately selected according to the installation conditions, the required degree of sound insulation, and the like.

  In addition, the heavy panel in the above-described embodiment has a single layer structure. However, in the case where it is desired to increase the thickness and to provide a sound insulation effect, a multilayer structure is provided by providing a partition parallel to the panel surface inside. You can also. In this case, a reinforcing rib is appropriately disposed between the partition wall and the wall surface of the panel. In addition, the sound insulation effect can also be heightened by arranging two or more weight panels having the same structure.

It is a front view of the soundproof wall for tunnels which is one embodiment of this invention. It is a side view of the noise barrier for tunnels of FIG. It is sectional drawing in the ZZ line | wire of FIG. It is sectional drawing in the YY line | wire of FIG. It is a front view which shows the framework of the noise barrier for tunnels of FIG. It is a side view which shows the framework of the noise barrier for tunnels of FIG. It is an enlarged view of the (a) part of FIG. It is an enlarged view of the (b) part of FIG. It is an enlarged view of the (c) part of FIG. It is an enlarged view of the (d) part of FIG. It is a partial cross section perspective view of a sound insulation panel (figure seen from the front side). It is a partial cross section perspective view (figure seen from the back side) of a sound insulation panel. It is a figure for demonstrating the connection state which connects between division panels. It is a top view of the sliding door unit for duct holes. It is a top view of the frame for sliding doors. It is a top view of a soundproof slide door. It is a top view of the framework in the soundproof wall for tunnels of a 2nd embodiment. It is a side view of the framework of FIG. It is sectional drawing of the sound insulation part in a soundproof slide door. It is a side view of the framework in the soundproof wall for tunnels of 3rd Embodiment. It is sectional drawing in the AA of FIG. It is the figure which looked at the handle from the lower part. It is sectional drawing in the BB line of FIG. It is explanatory drawing of a soundproof door, Comprising: (a) is front explanatory drawing, (b) is horizontal sectional explanatory drawing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tunnel soundproof wall 2 Wellhead wall part 3 Front wall part 4 Ceiling wall part 5 Side wall part 6 Support pillar 61,62 Slide groove 7 Heavy panel 72 Sand (heavy thing with high sound-insulation effect in a low frequency area)
100 Soundproof door t Tunnel t1 Tunnel entrance p Sound insulation panel p3 Storage tank p5 Packing layer p6 Support frame p7 Sound absorbing material p8 Sound absorbing material layer

Claims (5)

A wellhead wall made of a heavy object having a high sound insulation effect in a low-frequency sound range installed in front of the wellhead so as to close the wellhead in close contact with the wellhead of the tunnel being excavated,
A front wall portion made of a heavy object having a high sound insulation effect in a low-frequency sound range installed away from the tunnel extension direction outside with respect to the wellhead wall portion,
A connecting wall portion for connecting peripheral edges of the well wall portion and the front wall portion to each other;
Equipped with a,
The connecting wall portion includes a ceiling wall portion that connects the ceiling edges of the wellhead wall portion and the front wall portion to each other, and a side wall portion that connects the side edge portions of the wellhead wall portion and the front wall portion to each other. A soundproof wall for tunnels.   The well wall portion and the front wall portion include a plurality of support columns arranged at predetermined intervals in the wall width direction, and a plurality of weight panels having a high sound insulation effect in a low frequency sound range. The soundproof wall for a tunnel according to claim 1, wherein each of the weight panels is bridged between the support columns in a state where the upper and lower edges thereof are butted against each other.   The support column is made of a steel material having slide grooves extending in the vertical direction on both sides in the wall width direction, and the weight of the support column is slidably fitted to each slide groove of the adjacent support column. The soundproof wall for a tunnel according to claim 2, wherein the panel is spanned between the supporting columns.   The said weight panel consists of a hollow box formed in the shape of a flat rectangular parallelepiped, and an indeterminate thing with large specific gravity, such as soil, sand, or a liquid filled in the inside of this hollow box. Sound barrier for tunnel as described.   The connecting wall portion is constituted by a sound insulation panel including a filling layer in which at least one of a granular material and a liquid is filled in a storage tank, and a sound absorbing material layer made of a sound absorbing material supported by a support frame, The sound insulation panel for a tunnel according to any one of claims 1 to 4, wherein the sound insulation panel has an integral structure of the storage tank and the support frame.

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