Perforated pipe type noise suppressor for ventilation shaft of high-speed rail tunnel

Abstract

The perforated pipe type noise suppressor comprises a ventilation air pipe, the ventilation air pipe is arranged in the ventilation air shaft, a pipe cavity in the ventilation air pipe is a ventilation channel, an elastic cavity wall is arranged outside the ventilation air pipe, an air pipe open hole is formed in the outer wall of the ventilation air pipe, and the air pipe open hole is communicated with the ventilation air pipe. And the air pipe opening is positioned in the elastic cavity wall. According to the invention, detonation sound at the outlet of the ventilation shaft of the high-speed rail tunnel is effectively inhibited, noise pollution to the surrounding environment is reduced, and the living quality of residents is improved. By means of gas expansion speed reduction and reflection loss, dual suppression of noise is achieved, and the noise elimination effect is improved. Due to the design of the elastic cavity wall, the low-frequency noise elimination performance is improved, the noise elimination bandwidth is increased, and the better broadband noise elimination capacity is achieved. According to the cavity wall, the strength and durability of the whole structure are guaranteed, the vibration absorption performance is improved, and the silencing effect is further enhanced.

Description

Technical Field

[0001] The invention belongs to the technical field of high-speed railway tunnels, and in particular relates to a perforated tube type noise suppressor for a ventilation shaft of a high-speed railway tunnel. Background Art

[0002] With the rapid development of high-speed rail, the number of high-speed rail tunnels is increasing. When high-speed rail passes through a tunnel, the rapid squeezing and exhaust of air in the tunnel by the train often causes explosions at the ventilation holes of the high-speed rail tunnel, seriously affecting the normal lives of residents in towns and villages near the high-speed rail tunnel.

[0003] At present, although there are some sound absorption and noise reduction measures in railway tunnels, the effect is poor. The corridor-type sound-absorbing sheet structure used in the current mainstream design leads to a decrease in flow area and an increase in flow resistance, resulting in a larger fan selection in actual projects and high operating power, which is not conducive to energy saving and carbon reduction requirements. Due to the lack of effective treatment methods for blasting noise in tunnel ventilation shafts, it is necessary to develop a special form of noise suppressor with low flow resistance and high noise reduction. Summary of the invention

[0004] The present invention is proposed to solve the problems existing in the prior art, and its purpose is to provide a perforated tube noise suppressor for a high-speed railway tunnel ventilation shaft.

[0005] The technical solution of the present invention is: a perforated tube noise suppressor for a high-speed railway tunnel ventilation shaft, comprising a ventilation duct, wherein the ventilation duct is arranged in the ventilation shaft, the tube cavity in the ventilation duct is a ventilation channel, an elastic cavity wall is arranged outside the ventilation duct, a duct opening is arranged on the outer wall of the ventilation duct, and the duct opening is located in the elastic cavity wall.

[0006] Furthermore, the inner wall of the elastic cavity wall and the outer wall of the ventilation duct are combined to form an expansion cavity.

[0007] Furthermore, the air duct opening connects the ventilation channel of the ventilation air duct with the expansion cavity.

[0008] Furthermore, the air duct openings are multi-layer openings along the axis of the ventilation duct, and are evenly distributed between layers.

[0009] Furthermore, the air duct openings are evenly distributed in the circumferential direction in a single layer.

[0010] Furthermore, a soft vibration absorbing layer is arranged outside the elastic cavity wall, and the soft vibration absorbing layer covers the elastic cavity wall.

[0011] Furthermore, a concrete outer structure is arranged outside the soft vibration absorbing layer.

[0012] Furthermore, the elastic cavity wall is made of a four-layer fiber-wound rubber composite material.

[0013] The beneficial effects of the present invention are as follows: The present invention effectively suppresses the explosion sound at the outlet of the ventilation shaft of a high-speed railway tunnel, reduces the noise pollution to the surrounding environment, and improves the quality of life of residents.

[0014] The present invention realizes double suppression of noise and improves the silencing effect by means of gas expansion deceleration and reflection loss.

[0015] The design of the elastic cavity wall of the present invention not only improves the low-frequency silencing performance, but also increases the silencing bandwidth, thus having better broadband silencing capability.

[0016] The cavity wall of the present invention not only ensures the strength and durability of the overall structure, but also improves the vibration absorption performance and further enhances the sound-absorbing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a three-dimensional structural cross-sectional view of the present invention; Figure 2 It is a half-section schematic diagram of the present invention; Figure 3 It is a quarter axonometric view of the present invention; in: 1 Ventilation duct 2 Duct opening 3 Expansion cavity 4 Elastic cavity wall 5 Soft vibration absorbing layer 6 Concrete outer structure. DETAILED DESCRIPTION

[0018] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and embodiments: like Figures 1 to 3 As shown, a perforated tube noise suppressor for a high-speed railway tunnel ventilation shaft comprises a ventilation duct 1, wherein the ventilation duct 1 is arranged in the ventilation shaft, wherein the tube cavity in the ventilation duct 1 is a ventilation channel, wherein an elastic cavity wall 4 is arranged outside the ventilation duct 1, and an air duct opening 2 is arranged at the outer wall of the ventilation duct 1, wherein the air duct opening 2 is located in the elastic cavity wall 4.

[0019] The inner wall of the elastic cavity wall 4 and the outer wall of the ventilation duct 1 enclose an expansion cavity 3 .

[0020] The air duct opening 2 connects the ventilation channel of the ventilation air duct 1 with the expansion cavity 3 .

[0021] The air duct openings 2 are multi-layer openings along the axis of the ventilation air duct 1, and are evenly distributed between layers.

[0022] The air duct openings 2 are evenly distributed in the circumferential direction in the single layer.

[0023] A soft vibration absorbing layer 5 is disposed outside the elastic cavity wall 4 , and the soft vibration absorbing layer 5 covers the elastic cavity wall 4 .

[0024] A concrete outer structure 6 is arranged outside the soft vibration absorbing layer 5 .

[0025] The elastic cavity wall 4 is made of a four-layer fiber-wound rubber composite material.

[0026] Specifically, the ventilation duct 1 is the air flow area of ​​the ventilation shaft. The ventilation duct 1 is provided with evenly distributed duct openings 2 to facilitate the entry and expansion of high-pressure airflow, so that the compressed air in the tunnel enters the small holes when discharged outward through the wind shaft, and expands and decelerates in the expansion cavity 3.

[0027] Specifically, the opening area of ​​the ventilation duct 1 is surrounded by an expansion cavity 3, and the cavity wall is a composite structure, which is axially outwardly composed of an elastic cavity wall 4, a soft vibration absorbing layer 5, and a concrete outer structure 6. The noise generated by the air pressure fluctuation reaches the elastic cavity wall 4 and is reflected, and is reciprocated in the cavity of the elastic cavity wall 4 and gradually attenuated.

[0028] Specifically, the soft vibration absorbing layer 5 has two main functions: First, the soft vibration absorbing layer 5 can absorb part of the high-frequency vibration; Secondly, the soft vibration absorbing layer 5 can buffer the deformation of the elastic cavity wall 4 when reflecting noise and resisting gas expansion, thereby preventing the elastic cavity wall 4 from making hard contact with concrete or the mountain structure around the wind shaft, which would affect the service life.

[0029] Specifically, the concrete outer structure 6 is connected to the upper and lower tunnel air shaft structures, ensuring the structural strength and durability of the entire air shaft and the noise suppressor.

[0030] Specifically, the upper and lower ends of the concrete outer structure 6 form a sleeve structure that is sleeved outside the ventilation duct 1.

[0031] Specifically, the diameter and length of the ventilation duct 1 are designed according to the specific size of the high-speed railway tunnel ventilation shaft to ensure smooth air flow, and are usually 3-10 m in diameter.

[0032] Specifically, the air duct opening 2 is optimized in design to achieve the best gas expansion deceleration effect.

[0033] More specifically, the arrangement of the air duct openings 2 may be, but is not limited to, a diameter of 5-10 cm and a spacing of 80-150 cm.

[0034] Specifically, the elastic cavity wall 4 is made of a rubber composite material with good elasticity and durability, and may be but is not limited to a four-layer fiber-wound rubber composite material. The thickness of the elastic cavity wall 4 is generally 2-3 cm.

[0035] Specifically, the soft vibration-absorbing layer 5 is made of a material with high vibration-absorbing performance, such as polyurethane foam, and its thickness can generally be designed to be 10-15 cm.

[0036] Specifically, the thickness of the concrete outer structure 6 should be sufficient to ensure the strength and stability of the overall structure. Its design is based on the thickness of the concrete layer of the tunnel ventilation shaft in actual engineering, and the thickness is 10-20 cm.

[0037] Specifically, the suppressor is installed at the exit end of the ventilation shaft of the high-speed railway tunnel and is fixed by connection with the ventilation shaft to ensure its stable operation.

[0038] The present invention effectively suppresses the explosion sound at the outlet of the ventilation shaft of a high-speed railway tunnel, reduces the noise pollution to the surrounding environment, and improves the quality of life of residents.

[0039] The present invention realizes double suppression of noise and improves the silencing effect by means of gas expansion deceleration and reflection loss.

[0040] The design of the elastic cavity wall of the present invention not only improves the low-frequency silencing performance, but also increases the silencing bandwidth, thus having better broadband silencing capability.

[0041] The cavity wall of the present invention not only ensures the strength and durability of the overall structure, but also improves the vibration absorption performance and further enhances the sound-absorbing effect.

Claims

1. A perforated tube noise suppressor for high-speed railway tunnel ventilation shaft, characterized in that: The invention comprises a ventilation duct (1), wherein the ventilation duct (1) is arranged in a ventilation shaft, the tube cavity in the ventilation duct (1) is a ventilation channel, an elastic cavity wall (4) is arranged outside the ventilation duct (1), and a duct opening (2) is arranged on the outer wall of the ventilation duct (1), and the duct opening (2) is located in the elastic cavity wall (4).

2. The perforated tube noise suppressor for high-speed railway tunnel ventilation shaft according to claim 1, characterized in that: The inner wall of the elastic cavity wall (4) and the outer wall of the ventilation duct (1) are enclosed to form an expansion cavity (3).

3. The perforated tube noise suppressor for high-speed railway tunnel ventilation shaft according to claim 2, characterized in that: The air duct opening (2) connects the ventilation channel of the ventilation air duct (1) with the expansion cavity (3).

4. The perforated tube noise suppressor for high-speed railway tunnel ventilation shaft according to claim 1, characterized in that: The air duct openings (2) are multi-layer openings along the axis of the ventilation air duct (1), and are evenly distributed between layers.

5. A perforated tube noise suppressor for high-speed railway tunnel ventilation shaft according to claim 4, characterized in that: The air duct openings (2) are evenly distributed in the circumferential direction in the single layer.

6. The perforated tube noise suppressor for high-speed railway tunnel ventilation shaft according to claim 1, characterized in that: A soft vibration absorbing layer (5) is arranged outside the elastic cavity wall (4), and the soft vibration absorbing layer (5) covers the elastic cavity wall (4).

7. A perforated tube noise suppressor for high-speed railway tunnel ventilation shaft according to claim 6, characterized in that: A concrete outer structure (6) is arranged outside the soft vibration absorbing layer (5).

8. The perforated tube noise suppressor for high-speed railway tunnel ventilation shaft according to claim 6, characterized in that: The elastic cavity wall (4) is made of a four-layer fiber-wound rubber composite material.

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