A kind of interval sound-absorbing tunnel wall for optimizing the sound field in highway tunnel

Abstract

The utility model discloses an interval sound-absorbing tunnel wall for optimizing the sound field in a highway tunnel. The inner wall surface of the tunnel includes alternately arranged reflection areas and sound-absorbing areas. Noise is reflected in the reflection areas, and the sound-absorbing areas are used to absorb the medium and low frequency noises generated by ventilators and engines. The reflection area is the inner wall surface of the tunnel, and the sound-absorbing area is a sound-absorbing board covering the inner wall surface of the tunnel. The width ratio of the reflection area and the sound-absorbing area is 1:1. The sound-absorbing areas of the relatively arranged inner wall surfaces of the tunnel are relatively arranged. The sound-absorbing board of the sound-absorbing area is an arc-shaped board, and its arc is adapted to the inner wall surface of the tunnel, so that the sound-absorbing board fits the inner wall surface of the tunnel as a whole. When a car passes through the tunnel section, when it passes through the sound-absorbing area and the reflection area in turn, due to the different absorption and reflectivity of the incident sound waves by the sound-absorbing area and the reflection area, the sound field intensity of the driver and passenger's head will change in strength.

Description

Technical Field

[0001] The utility model relates to the field of public transportation, in particular to an interval sound-absorbing tunnel wall for optimizing the sound field in a highway tunnel by changing the sound field in a long straight semi-enclosed tunnel space. Background Art

[0002] Investigations show that most of the causes of highway traffic accidents are caused by driver fatigue and lack of concentration, especially in long tunnels. Since the tunnel itself is a semi-enclosed space, the sound field in the tunnel has always been a monotonous and boring sound signal, which makes drivers and passengers easily feel sleepy, greatly increasing the probability of traffic accidents. Once a traffic accident occurs in a highway tunnel, it will not only cause property losses, but also block traffic and even threaten life safety.

[0003] At present, the optimization of the sound field in the tunnel is mainly based on noise reduction, and the noise reduction solutions include active noise reduction and passive noise reduction. The active noise reduction method is designed based on the principle of sound wave interference and cancellation. By artificially laying out a sound source signal with a phase opposite to the original sound field source in the tunnel, the sound source signal interferes with the original sound field in the tunnel, thereby achieving the purpose of noise reduction in a certain area, and has a good noise reduction effect on low-frequency sound field signals.

[0004] Passive noise reduction technology is the mainstream technology for noise reduction in tunnels. The main methods used are paving low-noise roads or arranging sound-absorbing materials on the inner wall of the tunnel. Therefore, low-noise asphalt roads are often used in tunnels to replace traditional cement concrete roads to reduce tire noise caused by car tires. Some tunnels also use expanded perlite boards, metal sound-absorbing boards and other sound-absorbing materials to reduce the sound field in the tunnel, but the effect of arranging sound-absorbing materials on high-frequency sound fields is better than that on low-frequency sound fields.

[0005] The sound field in the tunnel causes driver fatigue. In addition to the increase in the amplitude of the traffic sound field, the main reason is that the sound field is too monotonous. On open roads, there is a way to optimize the sound field through the road surface structure. This method is to set grooves or protrusions of varying depths on the road surface. When a car passes by at a certain speed, the car tires will squeeze the air in the grooves to vibrate, thereby achieving the effect of sound. Depending on the depth of the grooves or the spacing between the grooves, the frequency of the sound field that excites the tire vibration to radiate outward changes, making the sound field no longer monotonous, and even producing a harmonious sound field of music. However, directly applying the music pavement to the tunnel will increase the intensity of the sound field in the tunnel. Summary of the invention

[0006] The utility model aims to solve the problem of monotony of the sound field in the tunnel without enhancing the sound field intensity in the tunnel, and proposes an interval sound-absorbing tunnel wall for optimizing the sound field in the highway tunnel. The wall surface of the tunnel wall is composed of alternate sound-absorbing areas and reflecting areas along the driving direction. When a car passes through the tunnel section, it passes through the sound-absorbing area and the reflecting area in turn. Due to the different absorption and reflectivity of the incident sound waves by the sound-absorbing area and the reflecting area, the sound field intensity at the head of the driver and the passenger will change in strength.

[0007] A spaced sound-absorbing tunnel wall for optimizing the sound field in a highway tunnel, the tunnel wall comprising two oppositely disposed tunnel inner wall surfaces and a ceiling;

[0008] The inner wall surface of the tunnel includes reflective areas and sound absorbing areas that are alternately arranged, the reflective areas have a low sound absorption coefficient, and most of the noise in the tunnel is reflected by the reflective areas, and the sound absorbing areas are used to absorb the medium and low frequency noises generated by the ventilator and the engine; and the reflective area is the inner wall surface of the tunnel, and the sound absorbing area is a sound absorbing board covering the inner wall surface of the tunnel;

[0009] The width ratio of the reflection area to the sound absorption area is 1:1; and the sound absorption areas of the oppositely arranged inner wall surfaces of the tunnel are oppositely arranged;

[0010] The sound absorbing plate in the sound absorbing area is a curved plate, and its curvature is adapted to the inner wall surface of the tunnel, so that the sound absorbing plate fits the inner wall surface of the tunnel as a whole.

[0011] Furthermore, the sound absorbing panel is a sandstone sound absorbing panel, and the connection between the sound absorbing panel and the inner wall of the tunnel is a double fastening method of screw connection and bonding.

[0012] Furthermore, at least half of the back side of the sound absorbing board is a bonding area, and the back side of the sound absorbing board is bonded to the inner wall of the tunnel by using adhesive; and the sound absorbing board is provided with a plurality of through holes for threaded connection between the sound absorbing board and the inner wall of the tunnel.

[0013] Furthermore, the thickness of the sound absorbing plate is 50 mm, and the bending angle is 120 degrees.

[0014] Optionally, the sound absorbing area is formed by a single sound absorbing panel, or is formed by combining multiple sound absorbing panels 2 .

[0015] The beneficial effects of the utility model are:

[0016] The wall surface of the interval sound-absorbing tunnel wall for optimizing the sound field in the highway tunnel described in the utility model is composed of alternating sound-absorbing areas and reflecting areas along the driving direction. When a car passes through the tunnel section, it passes through the sound-absorbing area and the reflecting area in turn. Since the sound-absorbing area and the reflecting area have different absorption and reflection rates for incident sound waves, the sound field energy reflected by the sound-absorbing area is much smaller than the energy reflected by the reflecting area, and the sound field intensity at the head of the driver and passengers will change in strength. The driver's drowsiness can be effectively relieved and driving safety is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram showing the structure of the interval sound-absorbing tunnel wall for optimizing the sound field in a highway tunnel according to the utility model;

[0018] Figure 2 A cross-sectional view showing the sound absorbing area of ​​a tunnel wall;

[0019] Figure 3 A schematic diagram showing a partial tunnel inner wall on one side.

[0020] In the figure:

[0021] 1: Tunnel enclosure structure; 2: Sound-absorbing panels; 3: Vehicles in the tunnel; 4: Geotechnical structure; 5: Glue; 6: Tunnel inner wall; 7: Through hole; 8: Reflection area; 9: Sound-absorbing area. DETAILED DESCRIPTION

[0022] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The described specific embodiments are only used to explain the present invention and are not intended to limit the present invention.

[0023] like Figure 1-2 As shown, a sound-absorbing tunnel wall for optimizing the sound field in a highway tunnel is provided. The tunnel wall is the inner surface of the tunnel body, including the inner wall surface 6 of the tunnel and the ceiling. The inner wall surface 6 of the tunnel is two oppositely arranged wall surfaces. The tunnel wall includes a tunnel enclosure structure 1 and a geotechnical structure 4 from the wall surface inward. The tunnel enclosure structure 1 is cast in concrete, and the surface of the tunnel enclosure structure 1 facing the tunnel is the tunnel wall.

[0024] The inner wall surface 6 of the tunnel includes reflective areas 8 and sound absorption areas 9 that are alternately arranged along the driving direction. The noise in the tunnel includes the noise generated by the tires and the road surface when the vehicle is driving, the noise of the vehicle engine, and the noise of the ventilator and other equipment in the tunnel. The frequency of each noise source is different. For example, the ventilator, engine, etc. generate medium and low frequency noise, and the tires and road surface generate high frequency noise. The reflective area 8 of the utility model is the inner wall surface 6 of the tunnel. Due to the low sound absorption coefficient, most of the noise is reflected in the reflective area 8. The sound absorption area 9 can absorb the medium and low frequency noise generated by the ventilator, engine, etc. Moreover, the interval arrangement of the sound absorption area 9 can enable the driver and passengers to fully adapt to the changes in the sound signal.

[0025] The width ratio of the reflection area 8 to the sound absorption area 9 is 1:1; and in order to ensure the same sound absorption effect on both sides when the vehicle passes through the tunnel, the sound absorption areas 9 of the oppositely arranged tunnel inner wall surfaces 6 are also symmetrically arranged in pairs.

[0026] The reflection area 8 is the inner wall surface 6 of the tunnel, and has a width of 6 m. Such a setting enables the drivers and passengers to fully adapt to the changes in the sound signals.

[0027] The sound absorption area 9 includes a sound absorption plate 2 fixed on the inner wall surface 6 of the tunnel. The arrangement width of the sound absorption plate 2 is 6m and the thickness is 50mm. The bottom surface of the sound absorption plate 2 fits the tunnel pavement and is arranged upward along the inner wall surface. The arrangement height is 2.5m from the top edge to the tunnel ground. The sound absorption plate 2 is an arc-shaped plate with a bending angle of 120 degrees. Its arc is adapted to the inner wall surface 6 of the tunnel so that the sound absorption plate 2 fits the inner wall surface 6 of the tunnel as a whole without generating gaps, and the sound absorption effect is better. Optionally, the sound absorption area can use a single sound absorption plate, or a plurality of sound absorption plates 2 can be combined to form the sound absorption area 9.

[0028] The sound-absorbing panel is made of sandstone sound-absorbing panel, which has a good sound-absorbing effect on the high-frequency sound field in the tunnel, can reduce the echo and reverberation time in the tunnel, and has good fire resistance. It is an ideal material for sound absorption and noise reduction in the tunnel, and is fixed on the inner wall 6 of the tunnel by screws and sound-absorbing panel adhesive 5.

[0029] The sound absorbing panel 2 is fastened by a double method of bolts and adhesive bonding to ensure the fixation of the sound absorbing panel to the inner wall surface 6 of the tunnel.

[0030] like Figure 3As shown, four through holes 7 are preset on the sound absorbing board 2 as open screw holes, which are used to fix the sound absorbing board 2 to the geotechnical structure 4 of the tunnel wall by screws. At the same time, in order to enhance the fixation, the entire back side of the sound absorbing board 2 is used as a pasting area, and the entire back side of the sound absorbing board 2 is pasted to the inner wall surface 6 of the tunnel by using adhesive 5 to enhance the fixation effect. The size of the adhesive 5 is adapted to the size of the sound absorbing board 2. The through holes 7 are symmetrically located near the four corners of the sound absorbing board 2.

[0031] The adhesive 5 is a structural adhesive commonly used for pasting building walls.

[0032] When the car 3 is traveling inside the tunnel, due to the alternating arrangement of the reflection area 8 and the sound absorption area 9, the sound field in the tunnel is continuously consumed on the sound absorption plate 2 in the sound absorption area 9, resulting in the sound field energy reflected by the sound absorption plate 2 being much smaller than the energy reflected by the tunnel inner wall surface 6 in the reflection area 8 itself, thereby achieving the effect of changing the sound field intensity received by the driver and passengers, changing the sound field in the tunnel wall, reducing the accumulation of the sound field in the tunnel, and warning the driver and passengers to drive safely.

[0033] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, all of which belong to the scope of protection of the present invention.

Claims

1. A sound-absorbing tunnel wall for optimizing the sound field in a highway tunnel, characterized in that: The tunnel wall comprises two oppositely arranged tunnel inner wall surfaces (6) and a ceiling; The tunnel inner wall surface (6) comprises reflective areas (8) and sound absorbing areas (9) arranged alternately, the reflective area (8) being the tunnel inner wall surface (6), and the sound absorbing area (9) being a sound absorbing plate (2) covering the tunnel inner wall surface (6); The width ratio of the reflection area (8) to the sound absorption area (9) is 1:1; and the sound absorption areas (9) of the oppositely arranged inner wall surfaces (6) of the tunnel are oppositely arranged; The sound absorbing plate (2) of the sound absorbing area (9) is a curved plate, the curvature of which matches the inner wall surface (6) of the tunnel, so that the sound absorbing plate (2) fits the inner wall surface (6) of the tunnel as a whole.

2. The interval sound-absorbing tunnel wall for optimizing the sound field in a highway tunnel according to claim 1, characterized in that: The sound absorbing plate (2) is a sandstone sound absorbing plate, and the connection between the sound absorbing plate (2) and the inner wall surface (6) of the tunnel is achieved by a double fastening method of screw connection and bonding.

3. The interval sound-absorbing tunnel wall for optimizing the sound field in a highway tunnel according to claim 2, characterized in that: At least half of the back side of the sound absorbing plate (2) is a bonding area, and the back side of the sound absorbing plate (2) is bonded to the inner wall surface (6) of the tunnel by using adhesive (5); and the sound absorbing plate (2) is provided with a plurality of through holes (7) for threaded connection between the sound absorbing plate (2) and the inner wall surface (6) of the tunnel.

4. The interval sound-absorbing tunnel wall for optimizing the sound field in a highway tunnel according to claim 2, characterized in that: The thickness of the sound absorbing plate (2) is 50 mm, and the bending angle is 120 degrees.

5. The interval sound-absorbing tunnel wall for optimizing the sound field in a highway tunnel according to claim 1, characterized in that: The sound absorbing area (9) is formed by a single sound absorbing panel (2), or by combining a plurality of sound absorbing panels (2).

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