A low sound-absorbing barrier beside the high-speed railway track

Abstract

The invention discloses a high-speed railway trackside sound-absorbing low barrier, including an upright sound-absorbing wall and an angled sound-absorbing wall fixed on the upright sound-absorbing wall; the angled sound-absorbing wall is composed of a first wall and a back plate arranged on the outside of the first wall, the first wall is a sound-absorbing wall, the inner upper part of the first wall is inclined outward by 30-45 degrees to form an outer folding surface 5; the back plate is a rigid back plate, and its longitudinal section is composed of a first vertical section, an inclined section and a second vertical section connected in sequence from bottom to top, the inclined section is inclined outward by 30-45 degrees, and the top height of the inclined section does not exceed the bottom edge height of the outer folding surface; the upright sound-absorbing wall is composed of a second wall and a sound-absorbing layer arranged on the entire inner surface of the second wall, the height of the second wall is flush with the top surface of the high-speed railway rail, and the inner side of the sound-absorbing layer is 200cm away from the center line of the track; the bottom of the back plate is fixedly connected to the second wall, and the height of the sound-absorbing low barrier is 150-175cm. The structure has low manufacturing cost and effectively reduces the noise outside the vehicle.

Description

Technical Field

[0001] The invention patent relates to the field of outdoor noise control of high-speed railways, and in particular to a low sound-absorbing barrier beside the track of a high-speed railway. Background Art

[0002] High-speed rail has become one of the most effective ways for people to travel long distances. With the increasing number of high-speed rail construction and the increase in operating speed, the resulting outdoor noise problem has become a prominent factor affecting the quality of life of residents along the line. How to reduce the outdoor noise of high-speed rail has become an issue of universal concern internationally.

[0003] High-speed railway noise is mainly located in the wheel-rail area, pantograph area, workshop connection area, etc. Among them, the wheel-rail area noise is the largest sound source, accounting for more than 80% of the energy. High-speed railway external noise control is a systematic project. Sound barrier technology, as a noise reduction measure on the propagation path, can effectively reduce external noise. The sound barriers currently used are mainly located on both sides of the line, with a height of usually 2.15m or 3.15m, and a noise reduction effect of 3dB(A) to 8dB(A).

[0004] For sections where the noise level exceeds the standard by less than 3dB(A), the cost-effectiveness of using sound barriers is low. For sections where the noise level exceeds the standard by more than 8dB(A), the height of the sound barriers needs to be at least 3.15m, which will block the passengers' vision. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, the present invention provides a low sound-absorbing barrier beside the high-speed railway track according to the law of high-speed railway noise energy distribution, which is used in sections where the noise reduction requirement is within 3dB(A) or as a supplement to the sound barrier. A combination of a low barrier and a sound barrier is adopted to improve the noise reduction effect without changing the height of the sound barrier, thereby ensuring the visual landscape of the passengers in the car.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A low sound-absorbing barrier beside a high-speed railway track, which extends along the outer side of the high-speed railway track, and the low sound-absorbing barrier comprises an upright sound-absorbing wall and an angled sound-absorbing wall fixedly mounted on the upright sound-absorbing wall; the angled sound-absorbing wall is composed of a first wall and a back plate arranged on the outer side of the first wall, the first wall is a sound-absorbing wall, and the inner upper part of the first wall is inclined outward by 30-45 degrees to form an outer folding surface 5; the back plate is a rigid back plate, and its longitudinal section is composed of a first vertical section connected in sequence from bottom to top , an inclined section and a second vertical section, the inclined section is inclined 30-45° outward, and the top height of the inclined section does not exceed the bottom edge height of the outer folded surface; the upright sound-absorbing wall is composed of a second wall and a sound-absorbing layer arranged on the entire inner surface of the second wall, the height of the second wall is flush with the top surface of the high-speed railway rail, and the inner side of the sound-absorbing layer is 200cm away from the center line of the track; the bottom of the back plate is fixedly connected to the second wall, and the height of the low sound-absorbing barrier is 150-175cm.

[0008] Preferably, the inner upper portion of the first wall is inclined 30° outward, and the first wall 1 is made of a sound-absorbing material, which can be ultra-high-strength concrete. The inclined surface of the first wall can increase the sound absorption area, and the inclined surface and the bogie 3 form a horn opening, which is conducive to the outward propagation of airflow.

[0009] Preferably, the inclined section of the back panel is inclined outward at 45°, and the back panel and the first wall form a sound absorbing structure. The inclined section of the back panel thickens the sound absorbing structure, increases the sound absorbing area and ensures the sound insulation of the structure.

[0010] In one embodiment of the present invention, the sound absorbing layer on the inner side of the second wall is an ultra-high strength concrete layer, and the thickness of the sound absorbing layer is preferably 2-5 cm.

[0011] In addition, preferably, the longitudinal section of the second wall is L-shaped, which is formed by the outer lower part of the second wall extending outward. The second wall is fixed on the bridge deck, and the L-shaped structure ensures the strength of the load.

[0012] In one embodiment of the present invention, the upper thickness of the second wall is 20 cm, the lower thickness is 25 cm, the height of the second wall is 75 cm, and the height of the first wall is 100 cm.

[0013] Preferably, the top edge of the inclined section is at the same height as the bottom edge of the outer folded surface 5, which is 95-120 cm. Preferably, the lower portion of the angled sound absorbing wall is the same thickness as the upper portion of the upright sound absorbing wall.

[0014] The high-speed railway trackside sound-absorbing low barrier of the present invention is easy to install and has low manufacturing cost; it is close to the noise in the wheel-rail area and has a large sound absorption area, which can effectively reduce the noise outside the vehicle. The low barrier and the bogie form a bell mouth, which is conducive to the outward propagation of airflow, prolongs the service life, and reduces maintenance costs. The structure can be used in sections where the noise exceeds the standard by 3dB(A), saving costs. In addition, the structure can be used as a supplement to the sound barrier and is used in sections where the noise exceeds the standard by more than 8dB(A). The combination of the low barrier and the sound barrier solves the problem of increasing the height of the sound barrier due to the requirement of noise reduction effect. The structure also has a good landscape effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the use status of the high-speed railway trackside sound-absorbing low barrier of the present invention.

[0016] In the figure:

[0017] 1. First wall; 2. Second wall; 3. Bogie; 4. Rail;

[0018] 5. Outer folding surface; 6. Sound absorbing layer; 7. Back plate; 8. Bridge deck. DETAILED DESCRIPTION

[0019] The structure of the high-speed railway trackside sound-absorbing low barrier of the present invention is described in detail below with reference to the accompanying drawings.

[0020] The high-speed railway trackside sound-absorbing low barrier of the present invention extends along the outer side of the high-speed railway track and is used to reduce the noise outside the train. Figure 1 As shown, the low sound-absorbing barrier comprises a vertical sound-absorbing wall and an angled sound-absorbing wall fixed on the vertical sound-absorbing wall.

[0021] In detail, the angled sound-absorbing wall is composed of a first wall 1 and a back plate 7 arranged outside the first wall 1. The first wall 1 is a sound-absorbing wall. The inner upper part of the first wall 1 is inclined outward by 30-45 degrees to form an outer folding surface 5 to reduce the aerodynamic load on the low barrier beside the track. The back plate 7 is a rigid back plate, and its longitudinal section is composed of a first vertical section, an inclined section and a second vertical section connected in sequence from bottom to top. The inclined section is inclined outward by 30-45 degrees, and the top height of the inclined section does not exceed the bottom edge height of the outer folding surface 5. The first wall 1 and the angled back plate 7 form a sound-absorbing body, which greatly ensures the noise reduction effect of the low barrier beside the track on the wheel-rail area. The upright sound-absorbing wall is composed of a second wall 2 and a sound-absorbing layer 6 arranged on the entire inner surface of the second wall 2. The height of the second wall 2 is flush with the top surface of the steel rail 4 of the high-speed railway. The inner side of the sound absorbing layer 6 is 200 cm away from the center line of the track, because the low barrier needs to have the function of a crash wall. The bottom of the back plate 7 is fixedly connected to the second wall 2, and the overall height of the low sound absorbing barrier is 150-175 cm.

[0022] The sound absorbing layer 6 can be made of ultra-high-strength concrete. The strength of ultra-high-strength concrete is generally not less than C60. The thickness of the sound absorbing layer 6 is generally 2-5 cm.

[0023] To improve the strength, the thickness of the lower part of the second wall 2 can be thickened so that its longitudinal section is L-shaped, which is formed by extending outward from the lower outer part of the second wall 2. The lower part of the angled sound absorbing wall is generally the same thickness as the upper part of the upright sound absorbing wall.

[0024] Preferably, the top edge of the inclined section of the back plate 7 is at the same height as the bottom edge of the outer folded surface 5 of the second wall 2, which is 95-120 cm.

[0025] In one embodiment of the present invention, the upper thickness of the second wall 2 is 20 cm, the lower thickness is 25 cm, and the height is 75 cm; the inner upper part of the first wall 1 is inclined 30° to the outside, the inclined section of the back plate 7 is inclined 45° to the outside, and the height of the first wall 1 is 100 cm; the length of the low sound-absorbing barrier is determined according to actual needs. The first wall 1 is also made of ultra-high-strength concrete, and the strength of ultra-high-strength concrete is generally not less than C60.

Claims

1. A low sound-absorbing barrier beside a high-speed railway track, which extends along the outer side of the high-speed railway track, characterized in that: The low sound-absorbing barrier comprises a vertical sound-absorbing wall and an angled sound-absorbing wall fixedly mounted on the vertical sound-absorbing wall; The angled sound-absorbing wall is composed of a first wall (1) and a back plate (7) arranged outside the first wall (1); the first wall (1) is a sound-absorbing wall, and the inner upper part of the first wall (1) is inclined outward by 30 degrees to form an outer folding surface (5); the back plate (7) is a rigid back plate, and its longitudinal section is composed of a first vertical section, an inclined section, and a second vertical section connected in sequence from bottom to top; the inclined section is inclined outward by 45 degrees, and the top height of the inclined section does not exceed the bottom edge height of the outer folding surface (5); The upright sound-absorbing wall is composed of a second wall (2) and a sound-absorbing layer (6) arranged on the entire inner surface of the second wall (2); the height of the second wall (2) is flush with the top surface of the steel rail (4) of the high-speed railway, and the inner side of the sound-absorbing layer (6) is 200 cm away from the center line of the track; The bottom of the back plate (7) is fixedly connected to the second wall (2), and the height of the low sound-absorbing barrier is 150-175 cm; The longitudinal cross-section of the second wall (2) is L-shaped, formed by the outer lower part of the second wall (2) extending outwards, the upper thickness of the second wall (2) is 20 cm, and the lower thickness is 25 cm.

2. The low sound-absorbing barrier according to claim 1, characterized in that: The sound absorbing layer (6) is an ultra-high-strength concrete layer, and the thickness of the sound absorbing layer (6) is 2-5 cm.

3. The low sound-absorbing barrier according to claim 2, characterized in that: The height of the second wall (2) is 75 cm; the height of the first wall (1) is 100 cm.

4. The low sound-absorbing barrier according to claim 3, characterized in that: The top edge of the inclined section of the back plate (7) is at the same height as the bottom edge of the outer folding surface (5), which is 95-120 cm.

5. The low sound-absorbing barrier according to claim 4, characterized in that: The first wall (1) is made of ultra-high-strength concrete.

6. The low sound-absorbing barrier according to claim 5, characterized in that: The lower portion of the angled sound absorbing wall has the same thickness as the upper portion of the upright sound absorbing wall.

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