JPH09264007A - Sound insulating wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively reduce noise without increasing the height of a sound insulating wall, and also to easily and quickly carry out the construction work. SOLUTION: At least two supporting frames 2, 3 are extended across between the supports 1 extended upward from a body wall and are fixed thereto, and a plurality of L-shaped arms 4 are fixed thereto at prescribed intervals along the longitudinal direction on both sides of these supporting frames 2, 3. Inclined members 5 constituting branched walls 10 are fixed to the respective L-shaped arms 4, and noise absorbing boards 7 are fitted between a plurality of inclined members 5 so as to form the branched walls 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproof wall provided as a measure for preventing noise generated by roads, railways, factories and the like.

[0002]

2. Description of the Related Art Conventionally, as a measure for preventing noise generated by roads, railways, factories, etc., it has been widely adopted to install a soundproof wall in order to prevent the noise from being propagated directly from the noise source. ing. This is because sound barriers are relatively inexpensive in various noise prevention measures, and are effective for various noise sources. In order to increase the noise reduction effect, it is necessary to increase the height of the soundproof wall. However, raising the noise barrier increases costs (the higher the height, the higher the construction costs,
It will increase the cost). In addition, there are many problems such as sunshine, landscape, view, oppressive feeling, ventilation, radio interference, and wind resistance.

Further, when the noise reduction effect is insufficient with only the straight wall, the tip-end type soundproof wall 10 in which the tip end of the soundproof wall as shown in FIG.
0, there is a curved soundproof wall 101 in which the tip of the soundproof wall is curved toward the noise source side as shown in FIG. 17, but these are more landscape, view, oppressive, ventilation, radio disturbance, windproof than straight walls. Load etc. becomes a problem. Recently, with the increase of traffic volume and speeding up of vehicles, environmental noise problem has become more serious, and there is no other countermeasure, so at the sacrifice of the above problems, straight wall type with heights of 3m, 7m, 10m. Soundproof walls, and even bendable soundproof walls,
Curved soundproof walls are used.

However, even if these soundproof walls are used, they can only be expected to have an effect corresponding to the height of the soundproof walls. In general, at a distant position (at a distance of about 20 m from the soundproof wall), the noise reduction effect obtained by increasing the height of the soundproof wall by 1 m is about 1 dB.

Therefore, in order to increase the noise reduction effect without increasing the height of the soundproof wall, a Y-type soundproof wall has been developed in which an auxiliary wall is provided so as to form an opening above.

[0006]

This Y-shaped soundproof wall is
The noise reduction effect can be improved without increasing the height of the soundproof wall, but there was a problem in terms of construction. That is, since the inclined wall is provided on the straight wall, the construction work becomes difficult, and there is a possibility that the wall cannot be securely attached to the straight wall, which makes it difficult to shorten the construction period.

[0007] Therefore, an object of the present invention is to provide a soundproof wall which can improve the noise reduction effect without increasing the height of the soundproof wall and can be easily and quickly constructed.

[0008]

In order to achieve the above-mentioned object, according to the present invention, a main body wall is constructed by attaching wall panels between columns provided at predetermined intervals, and the upper end of the main body wall is inclined toward the sound source side. The soundproof wall is provided with a first branch wall that is provided with a second branch wall that is inclined toward the side opposite to the sound source side, and at least two support frames are provided between columns that extend upward from the main body wall. A plurality of L-shaped arms are fixed on both sides of these support frames at predetermined intervals along the longitudinal direction, and an inclined member forming a branch wall is fixed to each L-shaped arm. A sound insulation plate is attached between the inclined members to form a branch wall.

[0009]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, two supporting frames 2 and 3 are hung and fixed on the upper end side of the supporting columns 1 provided at predetermined intervals between the adjacent supporting columns 1, and the supporting frames 2 and 3 are longitudinally attached to both sides. A plurality of L-shaped arms 4 are fixed at predetermined intervals along the direction, and each L-shaped arm 4 has an inclined member 5 forming a branch wall.
Is fixed. In this embodiment, the tip end of the horizontal portion 4A of the L-shaped arm 4 extending in the horizontal direction and the inclined member 5 are connected to each other via the rising member 6 rising from the inclined member 5. The sound insulating plate 7 is attached between the plurality of inclined members 5 to attach the inclined wall 1
0 is formed. Further, a sound insulating plate 8 is attached between the rising members 6 to form a re-branching wall 20 that re-branches in a direction different from that of the branch wall 10. A bolt 9 is provided on the lower support frame 3, and the lower end of a vertical portion 4B extending in the vertical direction of the L-shaped arm 4 is fixed via the bolt 9.

FIG. 2 is a plan view of the sound insulation plates 7 and 8 as viewed from above with the sound insulation plates 7 and 8 attached, and both ends of the support frame 2 are fixed between the support columns 1. First branch walls 10 that are inclined toward the sound source are formed on both sides in the longitudinal direction,
The second branch wall 11 that is inclined to the side opposite to the sound source side is formed, and the re-branch wall 20 is formed on each side.

FIG. 3 is a front view seen from the sound source side before the L-shaped arm 4, the tilting member 5 and the like are fixed to the support frames 2 and 3, and the support frames 2 and 3 are hooked between the columns 1 and fixed. Prior to this, the wall panel 12 is attached between the columns 1 to form the main body wall 13. H steel is used as the pillar 1, and a wall panel 12 is dropped between the H steels to form a main body wall 13. Note that FIG. 3 shows an example in which H steel in which the upper end of the column 1 is not gently bent toward the sound source side, that is, straight H steel is used.

In FIG. 4, the sound absorbing material 14 is attached to the first branch wall 10 on the sound source side, and the sound absorbing material 14 is also formed on the V-shaped inner surface formed by the upper end side of the branch wall 10 and the re-branching wall 20.
Attached, and the upper end side of the branch wall 11 on the side opposite to the sound source and the re-branch wall 2
The sound absorbing material 14 is attached to the V-shaped inner surface formed by 0 and 0. The unit of the numbers in the figure is mm, and the branch walls 10, 1
The height of 1 is 1000 mm, and the upper side opening width of the branch walls 10 and 11 on both sides is 2180 mm. As the sound absorbing material 14, rock wool, glass wool, ceramics, foam concrete or the like can be used. The sound absorbing material 14 is attached to the sound insulating plates 7 and 8 by bolts, pins, an adhesive, a perforated plate, a wire mesh or the like depending on the material or the like.

FIG. 5 illustrates the propagation of sound on the upper end side when the branch walls 10 and 11 and the re-branch wall 20 shown in FIG. 4 are mounted, and the re-branch wall 20 is compared with a conventional soundproof wall. Diffraction noise is reduced by the presence of. The sound pressure distribution when noise is generated in the 250 Hz octave band is shown in FIG. 6, and the sound intensity distribution is shown in FIG. The unit of the numerical value in FIG. 6 is dB. The arrow direction in FIG. 7 indicates the direction in which sound energy flows, and the longer the arrow, the greater the sound energy.

FIG. 8 shows a method for measuring the volume reduction (dB) in a state where the soundproof wall is attached. Each soundproof wall has a length of 100 at the end of the embankment road 21 with a 3.5 m step.
It installed over m and measured the soundproofing effect. Install the speaker 22 on the road 21 4.5m away from the soundproof wall,
250Hz, 500Hz, 1KHz, 2KHz, 4KH
A sound of z octave band was generated, and the noise level was measured by installing the microphone 23 at a height of 1.2 m from the ground and 20 m from the end of the road 21. As the soundproof wall, a straight wall type consisting of only a main body wall 2.5 m in height from the ground is used as Comparative Example D, and the volume reduction at each frequency of the following Examples A to C is measured based on this Comparative Example D. did. Example A is a Y-type soundproof wall having a total height of 2.5 m without the re-branching wall 20 and Example B is one in which the re-branching wall 20 is provided on both sides.
Example C was the one in which the re-branching wall 20 was provided and the sound absorbing material 14 was attached to the V-shaped inner surface. The measurement results are as shown in Table 1 below.

[0016]

[Table 1]

As is apparent from Table 1, the straight wall having only the main body wall 13, that is, Example A in which the branch walls 10 and 11 are provided as compared with Comparative Example D has a higher soundproofing effect, and is better than Example A. It can be seen that the soundproof wall provided with the re-branching wall 20, that is, Example B has a higher soundproof effect. It was also found that the soundproof wall provided with the sound absorbing material 14, that is, Example C had a higher soundproofing effect.

Generally, the lower the sound pressure level at the sound diffraction point, the weaker the diffracted sound. In Example B, as shown in FIG. 9, at the tip of the re-branching wall 20 re-branched from the second branch wall 11 on the side opposite to the sound source, the sound wave a sneaking from the sound source is reflected by the second branch wall 11. The sound pressure level becomes extremely small at a certain frequency by interfering with the generated sound wave b, and the final diffracted sound is drastically reduced. Further, as shown in FIG. 10, it is considered that the energy flow becomes a vortex from the sound receiving point side toward the sound source side at a certain frequency, and a noise reduction effect is produced.

FIG. 11 shows a case where the noise from the sound source 24 is measured at the evaluation point 25 on the Y-type soundproof wall without the re-branching wall 20. When this measurement result is compared with the measurement result in the case where a straight wall of the same height is used instead of the Y-type soundproof wall shown in FIG. 11, the noise reduction amount of the Y-type soundproof wall relative to the straight wall is shown in FIG. It looks like the graph. In this Y-shaped soundproof wall, as shown in FIG. 13, sound propagates along the wall. FIG. 14 shows the sound pressure level when noise is generated in the 250 Hz octave band in the upper V-shaped portion of the Y-type soundproof wall, and FIG. 15 shows the sound intensity distribution. The unit of the numerical value in FIG. 14 is dB.
It is. The direction of the arrow in FIG. 15 indicates the direction of sound energy flow, and the longer the arrow, the greater the sound energy.

[0020]

As described above, according to the present invention, the wall panel is attached between the columns provided at a predetermined interval to form the main body wall, and the first end inclined to the sound source side at the upper end of the main body wall.
Is a soundproof wall provided with a second branch wall that is inclined toward the side opposite to the sound source side, and at least two support frames are hung between columns extending upward from the main body wall. A plurality of L-shaped arms are fixed to both sides of these support frames at predetermined intervals along the longitudinal direction, and a tilting member forming a branch wall is fixed to each L-shaped arm. Since the sound insulation plate is attached between them to form the branch wall, the noise reduction effect is enhanced, and the construction can be performed easily and quickly. Further, the Y-type soundproof wall can improve the noise reduction effect without increasing the height of the soundproof wall. Further, in the case where the re-branching wall is provided, the noise reduction effect is further improved. Further, a plurality of L-shaped arms and tilting members are fixed in advance to the upper support frame, the support frames are hung between the columns to be fixed, and the lower end of the vertical portion of the L-shaped arm extending in the vertical direction is set to the lower support frame. If it adheres to, the construction can be performed more easily and quickly.

[Brief description of drawings]

FIG. 1 is a perspective view during construction showing a preferred embodiment of the present invention.

FIG. 2 is a plan view of the first and second branch walls and the re-branch wall as seen from above.

FIG. 3 is a front view seen from the sound source side before attaching the branch wall and the re-branch wall.

FIG. 4 is a side view with a sound absorbing material attached.

FIG. 5 is a diagram for explaining sound propagation on the upper end side when a re-branching wall is provided.

FIG. 6 is a sound pressure distribution map when noise is generated.

FIG. 7 is a sound intensity distribution map.

FIG. 8 is a diagram illustrating a noise measurement test method.

FIG. 9 is a diagram illustrating interference of sound waves.

FIG. 10 is a diagram illustrating a vortex of a sound wave.

FIG. 11 is an explanatory diagram for measuring the noise reduction effect of the Y-type soundproof wall.

FIG. 12 is a graph showing a noise reduction amount of a Y-type soundproof wall compared to a straight wall.

FIG. 13 is a diagram for explaining sound propagation in the Y-type sound barrier.

FIG. 14 is a diagram showing a sound pressure distribution of a Y-type soundproof wall.

FIG. 15 is a diagram showing a sound intensity distribution of a Y-type soundproof wall.

FIG. 16 is a cross-sectional view showing a conventional road soundproof wall.

FIG. 17 is a cross-sectional view showing another conventional road soundproof wall.

[Explanation of symbols]

 1 Support 2,3 Support Frame 4 L-Shaped Arm 5 Inclination Member 6 Standing Member 7,8 Sound Insulation Plate 10,11 Branch Wall 12 Wall Panel 13 Body Wall 14 Sound Absorbing Material 20 Re-Branching Wall

Claims (3)

[Claims] 1. A main body wall is constructed by attaching wall panels between columns provided at a predetermined interval, and a first branch wall inclined toward the sound source side is provided at the upper end of the main body wall, and the main wall is opposite to the sound source side. A soundproof wall provided with a second sloping wall that inclines to the side, and is secured by hanging at least two support frames between columns that extend upward from the main body wall, and on both sides of these support frames along the longitudinal direction. A plurality of L-shaped arms are fixed at predetermined intervals, and a tilting member forming a branch wall is fixed to each L-shaped arm, and a sound insulating plate is attached between the plurality of tilting members to form a branch wall. Soundproofing wall. 2. The tip of a horizontal portion of the L-shaped arm extending in the horizontal direction and the inclined member are connected via a rising member rising from the inclined member, and a sound insulating plate is attached between these rising members to form a branch wall. The soundproof wall according to claim 1, wherein a re-branching wall that re-branches in a different direction is formed. 3. A plurality of L-shaped arms and a tilt member are previously fixed to an upper support frame, the support frames are hung between the columns to be fixed, and the lower end of a vertical portion extending in the vertical direction of the L-shaped arm is lowered. The soundproof wall according to claim 1 or 2, wherein the soundproof wall is fixed to the support frame.