JP2008163681A - Tunnel sound insulating wall - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tunnel sound insulating wall being easy to construct and good in working efficiency and having sufficient sound insulating effects for supporting an inner formwork when constructing a face wall in a well-head. <P>SOLUTION: The tunnel sound insulating wall comprises a wall body 2 having a working face side wall portion 4 to be installed facing the working face side of a tunnel being excavated and a well-head side wall portion 5 to be opposed to the working face side wall portion 4 via a space k, and a wheel 3 to be arranged on the lower part of the wall body 2 for rolling on a rail r. Both side wall portions 4, 5 contain heavy materials 15b having high sound insulating effects in a low frequency sound range. A supporting portion 16 is provided between both side wall portions 4, 5 for supporting the inner formwork uk which forms an inner peripheral face W2 of the face wall to be constructed in the well-head. <P>COPYRIGHT: (C)2008,JPO&INPIT

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 noise countermeasure in such tunnel construction, it is common to install a soundproof wall between the wellhead and the face, and as an example, a wallboard facing the face and a wallboard facing the wellhead There has been proposed a soundproof wall for tunnels in which a gap is provided between the two and a sand is filled in the gap (see, for example, Patent Document 1).

Utility Model Registration No. 2561582

  In the conventional tunnel soundproof wall, it is necessary to fill the sand between the wall plates arranged in the tunnel extension 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 noise barrier for tunnels has a drawback that it takes a very long time to construct the noise barrier. In addition, in the case of a soundproof wall in which sand is filled between a pair of front and rear wall plates, it is attenuated only once in the low frequency sound range, so that a sufficient soundproof effect cannot be obtained depending on the thickness of the sand layer. There is a case.

  Further, since the conventional tunnel noise barrier is fixed, in order to place the lining concrete behind the tunnel noise barrier, the tunnel noise barrier is disassembled and removed and then slid. It is necessary to insert a movable formwork device such as a centle and then assemble the soundproof wall for the tunnel again. For this reason, the work is not only complicated, but also has the disadvantage that work efficiency is extremely poor.

  Also, because the surface walls on the tunnel well side and the opposite well side are usually constructed with one slide centle, the lining concrete construction work on the slide centle is finished and the face wall construction on the opposite mine side is not finished. The face wall construction cannot be started. And when it is difficult to return the slide centle to the wellhead, such as when the tunnel extension is long, or when the tunnel curve radius is small, the surface wall construction on the wellhead side is done by ballacentle. Has the disadvantage of being expensive.

  In view of the above circumstances, the present invention provides a soundproof wall for a tunnel that is easy to construct, has good work efficiency, has a sufficient soundproofing effect, and can support an inner frame when constructing a face wall at a wellhead. For the purpose.

  The soundproof wall for a tunnel of the present invention includes a wall body having a face side wall portion facing the face side of the tunnel being excavated, and a well wall side portion facing the face side wall portion through a space, A soundproof wall for a tunnel provided at a lower part of a wall body and capable of rolling on a rail, wherein the both side walls include a heavy object having a high sound insulation effect in a low frequency sound range. A support portion for supporting an inner mold for molding the inner peripheral surface of the face wall constructed at the wellhead is provided between the both side wall portions.

  Since the tunnel noise barrier is a mobile noise barrier equipped with wheels, it can be assembled not in the tunnel but in front of the wellhead. Thereby, it can construct using a big construction machine (for example, large crane vehicle etc.) which could not be used in a tunnel. Moreover, since it is mobile, it is only necessary to move the slide centle even when it is inserted into the tunnel, so that it is not necessary to dismantle the soundproof wall and work efficiency is improved. The face side wall portion and the well side wall portion both include heavy objects having a high sound insulation effect in the low frequency sound range and are disposed apart from each other, so that the low frequency sound range is attenuated at least twice. The soundproofing effect is improved in terms. Furthermore, since the support part that supports the inner frame for molding the inner peripheral surface of the face wall is provided between the both side wall parts, when the soundproof wall becomes unnecessary, it is moved from the inside of the well to the vicinity of the wellhead. If the inner mold is attached to the support and the wall mold is installed on the inner mold, the face wall can be constructed. Thereby, it is possible to construct a face wall at the wellhead without waiting for the completion of the lining concrete placement work of the slide center.

In the soundproof wall for a tunnel, it is preferable that an air supply duct and an exhaust duct pass through both side walls.
In this case, exhaust air with high concentration containing blasting gas, concrete dust, etc. in the space between the face and the soundproof wall for tunnel from the exhaust duct, and send fresh air to the space from the air duct As a result, ventilation efficiency can be improved.

In the noise barrier for tunnels, it is preferable that a diffusion piece as a sound deadening member is installed between both side wall portions.
In this case, the noise can be dispersed by reflecting the noise generated from one direction (face side) in various directions by the diffusion piece. As a result, noise is dispersed in the space between the side wall portions, so that the sound absorption effect is enhanced and noise can be prevented from being amplified.

  According to the soundproof wall for a tunnel of the present invention, the construction is simple, the work efficiency is good, and a sufficient soundproofing effect can be obtained and used as a formwork for a mine.

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 as seen from the face side, and FIG. 2 is a side view thereof.

As shown in FIG. 1, the soundproof wall 1 for a tunnel includes a wall body 2 having a substantially semicircular shape, and a wheel 3 disposed under the wall body 2.
As shown in FIG. 2, the wall body 2 has a face side wall portion 4 that faces the face side, and a well wall side portion 5 that faces the face side wall portion 4 via a space k. . The wall shapes of the face side wall 4 and the well side wall 5 substantially match the cross-sectional shape of the inner wall surface W1 of the tunnel, and as shown in FIG. 1, the wall area is slightly smaller than the inner wall surface W1 of the tunnel. Has been. And the outer peripheral edge of the face side wall part 4 and the well side wall part 5 is each provided with the seal part 6 in order to cover the whole inner wall surface W1 of a tunnel, and to improve a sealing performance.
The wheel 3 is installed in the lower part of the wall body 2 and can roll on a rail r laid in the tunnel. This wheel 3 enables the tunnel soundproof wall 1 to move in the mine.

  Further, the tunnel soundproof wall 1 is provided with a double-sound opening type soundproof door 20 and a humane door 21 so that equipment and personnel can enter and leave the tunnel. Similarly to the weight panel 15 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. Further, on the upper side of the soundproof door 20, a duct (wind pipe) 7 passes through both side wall portions 4 and 5.

  The soundproof wall 1 for a tunnel is configured by attaching a plurality of plate-like members to a framework mainly composed of a steel frame, and each of the wall portions 4 and 5 has a plurality of small wall members (a weight panel 15 described later). ) Is attached. The framework has a carriage 8 on which the wheels 3 are installed at the lower part thereof, and a gate-type mount 9 installed on the carriage 8. The gantry 9 includes two pairs of legs 91 extending in the vertical direction and a gantry 92 provided between the upper portions of the two pairs of legs 91. The skeleton further includes a vertical beam member 10 extending in the vertical direction other than the legs 91, a horizontal beam member 11 extending in the horizontal direction and connecting the legs 91 and the vertical beam members 10, and the soundproof wall 1 for the tunnel on the ground. The outer frame member 14 extends in a substantially semicircular shape at the outer peripheral edge portions of the face side wall portion 4 and the wellhead side wall portion 5.

3 is a cross-sectional view taken along line YY of FIG.
Each of the face side wall 4 and the well side wall 5 is provided with leg bodies 91 arranged at predetermined intervals in the wall width direction, the longitudinal beam member 10, the outer frame member 14, and a sound insulation effect in a low frequency sound range. A plurality of heavy weight panels 15. As shown in FIG. 3, the leg body 91, the longitudinal beam member 10 and the outer frame member 14 are made of H steel (H-shaped steel), and both grooves m1, m2, m3, m4, m5 and m6 of the H steel are used for tunneling. The soundproof wall 1 is oriented so as to be located on both sides in the wall width direction. Both weight panels 15 are placed in the grooves m2 and m3 of the adjacent leg 91 and the longitudinal beam member 10 facing each other, and in the grooves m4 and m5 of the adjacent longitudinal beam member 10 and the outer frame member 14 facing each other. The weight panel 15 is bridged between the leg 91 and the longitudinal beam member 10 and between the longitudinal beam member 10 and the outer frame member 14 by fitting the edges. A plurality of weight panels 15 are stacked in the vertical direction.

The weight panel 15 includes a hollow box 15a formed in an appropriate shape such as a flat rectangular parallelepiped shape, and sand 15b filled in the hollow box 15a. Both surfaces of the hollow box 15a in the wall thickness direction are constituted by thin metal plates having substantially corrugated irregularities. The filler in the hollow box 15a is not limited to the sand 15b, and may be soil, water, or the like. As a result of using this weight panel 15, the face side wall 4 and the well side wall 5 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 15, and have a high sound insulation effect in a low frequency sound range.

The tunnel soundproof wall 1 is provided with a seal 6 on the outer peripheral edge of the face side wall 4 and the well side wall 5 in order to cover the entire cross section of the tunnel and improve the sealing performance. As shown in FIG. 2, the seal portion 6 has a wooden sheet pile 61 attached to the face side and the wellhead side at the peripheral edge of the face sidewall portion 4 and the wellhead sidewall portion 5, and a gap between the sheet piles 61. It is composed of filled sand 62. The sand 62 may be directly filled, but sand sand bags or the like may be used. Moreover, what is attached to the face side and the wellhead side is not limited to the wooden sheet pile 61 but may be a sliding ring, a rubber plate, or the like.
The tunnel noise barrier 1 is moved in a state where the seal portion 6 is not attached.

And between the said both-side wall parts 4 and 5, the support part 16 which supports the internal form frame uk for shape | molding the internal peripheral surface W2 of the surface wall M constructed | assembled at a wellhead is provided. FIG. 4 is a front view for explaining the support portion 16, and FIG. 5 is a side view for explaining the support portion 16.
The support portion 16 is provided between the side wall portions 4 and 5. That is, it is installed on the upper part of the gantry 9 and on both side surfaces of the vertical beam member 10 so as to be positioned on the space k side with respect to the weight panel 15. Here, the support portion 16 includes a hydraulic jack 17, and an inner mold uk can be attached to the tip thereof.

  The inner formwork uk is, for example, five steel formwork plates 18a to 18 having curved surfaces obtained by dividing a predetermined length of W2 corresponding to the secondary lining surface (inner peripheral surface of the face wall) W2 of the tunnel into five parts. 18e and hinges 19 that join the respective mold plate plates 18a to 18e in a foldable manner. Then, when the support portion 16 is moved to a certain position on the lateral side of the tunnel cross section by the hydraulic jack 17, the mold plate 18a to 18e is unfolded and set so that the outer peripheral surface (form frame surface) uk1 of the inner mold frame uk is secondarily covered. It coincides with the work surface (inner peripheral surface of the face wall) W2 (see FIG. 4). Then, as shown in FIG. 5, a wall surface form mk is installed around the inner form uk to construct the face wall M. Thereafter, when each mold plate 18a to 18e is moved to a certain position in the center direction of the tunnel cross section by the hydraulic jack 17 from the unfolded state, the inner mold frame uk is folded and the mold surface uk1 becomes the inner peripheral surface W2 of the surface wall. Get away from.

  The tunnel noise barrier 1 may be attached to the inner frame uk on the support 16 when the surface wall M is constructed at the wellhead. Moreover, it is also possible to move and fix in the pit with the inner form uk attached, and in this case, the inner form uk is folded. Then, after the excavation work by blasting is completed, the tunnel soundproof wall 1 is moved to the vicinity of the wellhead, the inner mold uk is expanded, and the face wall M is constructed. The inner mold uk is not limited to the five steel mold plates 18a to 18e as described above, and wooden ones can also be used. Moreover, the support part 16 does not necessarily need to be provided with the hydraulic jack 17, and it does not matter as long as the inner mold frame uk supported by the support part 16 can mold the inner peripheral surface W2 of the face wall.

  The tunnel soundproof wall 1 configured as described above is a mobile soundproof wall provided with wheels 3, and therefore can be assembled not in the tunnel but in front of the wellhead. Therefore, construction can be performed in front of the wellhead using a large construction machine (for example, a large crane truck or the like) that could not be used in the tunnel. Moreover, since it is mobile, it is only necessary to move the slide centle even when it is inserted into the tunnel, so that it is not necessary to dismantle the soundproof wall and work efficiency is improved. And both the face side wall 4 and the well side wall 5 are made of heavy objects having a high sound insulation effect in the low frequency sound range, and are set apart from each other, so the low frequency sound range is attenuated twice. In this respect, the soundproofing effect is improved. That is, as can be seen from the cross-sectional view of FIG. 2, sound such as blast generated in the tunnel first passes through the face side wall 4, and then the space k between the face side wall 4 and the well side wall 5. And pass through the wellhead side wall 5. Therefore, the first low-frequency sound range is attenuated by the face side wall portion 4 and the second low-frequency sound range is attenuated by the well-wall side wall portion 5, 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. Furthermore, since the support portion 16 that supports the inner frame uk for molding the inner peripheral surface W2 of the face wall M is provided between the both side wall portions 4 and 5, when the soundproof wall is no longer necessary, If the inner mold uk is attached to the support 16 and the wall form mk is installed on the inner mold uk, the face wall M can be constructed. Thereby, the face wall M can be constructed at the wellhead without waiting for the end of the lining concrete placement work of the slide center.

  In the above embodiment, one duct 7 is provided on the upper side of the soundproof door 20, but an air supply duct 71 and an exhaust duct 72 can also be provided as shown in FIG. In the second embodiment, as shown in FIG. 7, a high-concentration pollution containing blasting gas, concrete dust, etc. in the space K between the face kh and the tunnel soundproof wall 1 from the exhaust duct 72 by the dust collector sj. The air can be exhausted and fresh air can be sent from the air supply duct 71 to the space K (see the arrow in FIG. 7). Thereby, ventilation efficiency can be improved.

  In order to reduce the noise passing through the tunnel noise barrier 1, a diffusion piece 22 may be disposed as a silencing member in a space k between the face side wall 4 and the well side wall 5 as shown in FIG. 8. Tunnel blasting is a staged blasting that occurs approximately every 0.25 seconds. If the noise generated in the first stage is not quickly muffled, it will resonate with the second stage noise that occurs next, resulting in a louder noise. Therefore, the diffusion piece 22 is installed and quickly muffled. In the third embodiment, for example, a curved aluminum plate shown in FIG. 9 can be used as the diffusion piece 22. The diffusion piece 22 can disperse noise by reflecting noise generated from one direction (face side) in various directions (see arrows in FIG. 8). As a result, the noise absorption effect is enhanced by the noise being dispersed in the space k, and noise amplification due to step-by-step can be prevented.

  If the noise passing through the tunnel soundproof wall 1 is reduced, the muffling member is not necessarily provided in the space k between the face wall portion 4 and the well side wall portion 5. For example, a blower (contra fan) can be installed in the space K between the face kh and the soundproof wall 1 for tunnel. By generating air vibration by sending wind toward the face at the time of blasting with this contra fan, the air vibration caused by blasting and the air vibration of the contra fan collide with each other to obtain a silencing effect.

  It is also possible to provide a soundproof curtain in the space K between the face kh and the tunnel soundproof wall 1. By providing the curtain, the air vibration due to blasting is transmitted to the curtain and vibrates, and the air vibration is converted into the object vibration, whereby noise can be reduced. Examples of the material of the curtain include glass wool, plywood, and rubber.

  In the above-described embodiment, the face side wall portion 4 and the wellhead side wall portion 5 are configured by the weight panel 15 filled with sand inside, but the present invention is not limited to this, For example, the face side wall portion 4 and the well side wall portion 5 have a two-layer structure of a filling layer (the filling layer is filled with a heavy object having a high sound insulation effect in a low frequency sound region) and a sound absorbing material layer. You can also. And the sound absorbing material layer has a high sound absorbing effect in the high frequency sound range, while the weight panel 15 has a high sound insulating effect in the low frequency sound range, and if the thickness is comparable, the sound insulating effect as a whole than the sound absorbing material layer. The panel structure can be selected as appropriate according to the installation conditions, the required degree of sound insulation, and the like in consideration of the high quality.

  In addition, the weight panel 15 in the above-described embodiment has a single-layer structure. However, when the thickness is increased and a sound insulation effect is desired, a partition wall parallel to the panel surface is provided in the multilayer panel structure. You can also In this case, a reinforcing rib is appropriately disposed between the partition wall and the wall surface of the weight panel 15. In addition, the sound insulation effect can also be improved by arranging two or more layers of the weight panels 15 having the same structure.

It is a front view of the soundproof wall for tunnels concerning one embodiment of the present invention. It is a side view of the noise barrier for tunnels of FIG. It is sectional drawing in the YY line | wire of FIG. It is front explanatory drawing explaining the support part of the noise barrier for tunnels. It is side surface explanatory drawing explaining the support part of the noise barrier for tunnels. It is a front view of the soundproof wall for tunnels concerning the 2nd Embodiment of this invention. It is a top view of the noise barrier for tunnels of FIG. It is side surface explanatory drawing explaining the noise barrier for tunnels concerning the 3rd Embodiment of this invention. It is a figure explaining the shape of the diffusion piece which is a sound deadening member, (a) is front explanatory drawing, (b) is a plane explanatory drawing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tunnel soundproof wall 2 Wall body 3 Wheel 4 Face face side wall part 5 Wellhead side wall part 6 Seal part 7 Duct 9 Mounting frame 15 Heavy panel 15b Sand (heavy object with high sound insulation effect in low frequency region)
16 Supporting part 22 Diffusion piece (silencer member)
W1 Tunnel inner wall surface W2 Secondary lining surface (inner surface of face wall)
uk inner formwork

Claims (3)

A wall body having a face side wall portion facing the face side of the tunnel being excavated and a well side wall portion facing the face side wall portion through a space, and disposed at a lower portion of the wall body; A tunnel soundproof wall having wheels that can roll on rails,
The both side walls include a heavy object having a high sound insulation effect in a low-frequency sound region, and a support part that supports an inner frame for molding the inner peripheral surface of the face wall constructed in the wellhead is between the both side walls. A soundproof wall for tunnels, characterized in that it is provided in.   The soundproof wall for a tunnel according to claim 1, wherein an air supply duct and an exhaust duct pass through the both side walls.   The soundproof wall for a tunnel according to claim 1 or 2, wherein a diffusion piece as a sound deadening member is installed between the side wall portions.

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