Tunnel noise reduction structure

Abstract

This utility model relates to the field of engineering construction technology, and in particular to a tunnel noise reduction structure. The utility model includes an arc-shaped sound-absorbing component arranged along the extension direction of the tunnel; the sound-absorbing component includes sound-absorbing cotton and a sound-absorbing plate with cavities. The outer wall of the sound-absorbing plate is fixedly installed on the inner wall of the tunnel. Multiple spiral cavities are provided within the cavity of the sound-absorbing plate. Multiple first through holes are opened on the inner wall of the sound-absorbing plate, and each of the multiple first through holes corresponds to and communicates with one of the multiple spiral cavities. The sound-absorbing cotton is adhered to the inner wall of the sound-absorbing plate, and multiple second through holes are opened on it, each of the multiple second through holes corresponding to and communicating with one of the multiple first through holes. Mid-to-high frequency noise can be absorbed by the sound-absorbing cotton, and low-frequency noise can be repeatedly reflected within the spiral cavities of the sound-absorbing plate, thereby converting the acoustic energy of low-frequency noise into heat energy dissipation, improving the noise reduction efficiency and effect within the tunnel.

Description

Technical Field

[0001] This utility model relates to the field of engineering construction technology, and in particular to a tunnel noise reduction structure. Background Technology

[0002] A tunnel is an underground passage structure built underground, beneath mountains, or under water, using methods such as manual excavation or tunnel boring machine excavation. It has a specific cross-sectional shape and length and is used to traverse natural obstacles (such as mountains, rivers, and urban building complexes) or to meet functional requirements such as transportation, water conservancy, and municipal services. Highway tunnels are one type of tunnel.

[0003] Highway tunnels are underground passage structures designed specifically for highway vehicles such as cars and trucks. Their core purpose is to cross natural or man-made obstacles such as mountains, rivers, and urban building complexes. They also have the functions of improving traffic efficiency, ensuring driving safety, and reducing interference with the surface environment. They are key nodes in the highway network that cross complex terrain.

[0004] When cars and trucks travel in highway tunnels, the confinement of the tunnel's narrow and enclosed space prevents noise from effectively dissipating, leading to noise amplification and pollution. For example, when car tires contact the tunnel surface, the road texture compresses the air, the tire tread deforms and recovers, and the vibration of the tire rolling together to generate friction noise, which is mainly mid-to-high frequency. The mechanical vibration of the car engine, combustion impact, and airflow pulsation of the exhaust system generate noise; engine mechanical noise is mostly low-frequency, while exhaust noise is mainly mid-to-high frequency. When a car travels at high speed in a tunnel, the relative motion between the car body and the stationary air in the tunnel causes air to separate, vortex, and impact on the car body surface (such as the front, windows, and rear), forming aerodynamic noise, which is mainly low-frequency.

[0005] In existing technologies, porous sound-absorbing structures such as sound-absorbing bricks and centrifugal glass wool are often used to reduce noise in highway tunnels. However, sound-absorbing bricks and centrifugal glass wool only have a certain absorption effect on mid-to-high frequency noise, and their sound absorption efficiency for low-frequency noise is insufficient.

[0006] Therefore, there is an urgent need for a tunnel noise reduction structure that can not only absorb mid-to-high frequency noise in highway tunnels, but also has a good sound absorption effect on low frequency noise, so as to improve the noise absorption efficiency in highway tunnels. Utility Model Content

[0007] (a) Technical problems to be solved

[0008] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a tunnel noise reduction structure that solves the technical problem of low sound absorption efficiency of existing tunnel noise reduction structures for low-frequency, mid-frequency and high-frequency noise.

[0009] (II) Technical Solution

[0010] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0011] This utility model provides a tunnel noise reduction structure, including an arc-shaped sound-absorbing component arranged along the extension direction of the tunnel; the sound-absorbing component includes sound-absorbing cotton and a sound-absorbing plate with cavities, the outer wall of the sound-absorbing plate is fixedly installed on the inner wall of the tunnel, the interior of the sound-absorbing plate is provided with multiple spiral cavities, and the inner wall of the sound-absorbing plate is provided with multiple first through holes, which are connected to the multiple spiral cavities one by one, so that noise can enter the spiral cavities through the first through holes and be repeatedly reflected to convert sound energy into heat energy for dissipation; the sound-absorbing cotton is bonded to the inner wall of the sound-absorbing plate, and multiple second through holes are provided thereon, which are connected to the multiple first through holes one by one, and the sound-absorbing cotton is used to absorb noise.

[0012] Preferably, the sound-absorbing panel includes an arc-shaped box with the cavity and a plurality of sound-absorbing components; the outer wall of the arc-shaped box is fixedly installed on the inner wall of the tunnel, the inner wall of the arc-shaped box is bonded to the sound-absorbing cotton, a plurality of first through holes are opened on the inner wall of the arc-shaped box, and an installation cavity is opened inside the arc-shaped box; the plurality of sound-absorbing components are all fixedly installed in the installation cavity, and the plurality of sound-absorbing components are arranged at intervals along the extension direction of the tunnel and its inner wall; each sound-absorbing component has a spiral cavity inside, and each sound-absorbing component has a third through hole on its side wall facing the sound-absorbing cotton, the third through hole communicating with the first through hole and the spiral cavity respectively, so that the noise can sequentially pass through the corresponding connected second through hole, first through hole and third through hole into the corresponding spiral cavity and be repeatedly reflected.

[0013] Preferably, the sound-absorbing component includes a housing and a reflector; the housing is fixedly installed inside the arc-shaped housing, and the third through hole is opened on the side wall of the housing facing the sound-absorbing cotton; the reflector is spiral-shaped, the reflector is fixedly installed inside the housing, and the reflector is coaxially arranged with the housing, the reflector and the internal cavity of the housing forming the spiral cavity, so that the noise can be repeatedly reflected by the wall surface of the reflector.

[0014] Preferably, the inner wall of the sound-absorbing cotton is provided with multiple protrusions to increase the contact area between the sound-absorbing cotton and the noise.

[0015] Preferably, the tunnel noise reduction structure further includes a keel frame; the outer wall of the keel frame is fixedly installed on the inner wall of the tunnel, and the interior of the keel frame is provided with a snap-fit ​​space, in which the sound-absorbing panel and the sound-absorbing cotton are snapped into the snap-fit ​​space, so that the sound-absorbing components are fixedly installed on the inner wall of the tunnel through the keel frame.

[0016] Preferably, the keel frame includes two identical keel frames; both keel frames are arc-shaped and are spaced apart from each other along the extension direction of the tunnel, and are fixedly installed on the inner wall of the tunnel; slots are provided on the opposite side walls of the two keel frames, and the slots form the snap-fit ​​space, and the sound-absorbing panel and the sound-absorbing cotton are respectively inserted into the two slots along the two side walls of the tunnel.

[0017] Preferably, the keel frame includes an arc-shaped channel steel and two arc-shaped connecting plates; the outer wall of the arc-shaped channel steel fits against the inner wall of the tunnel, the grooves of the two arc-shaped channel steels are arranged opposite each other, and the grooves are the slots; the two arc-shaped connecting plates are respectively fixedly connected to the two side walls of the arc-shaped channel steel along the two sides of the tunnel, and the outer walls of the two arc-shaped connecting plates can fit against the inner wall of the tunnel, and multiple screw holes are opened on the two arc-shaped connecting plates. The arc-shaped connecting plates are fixedly installed on the inner wall of the tunnel by bolts passing through their corresponding screw holes, so as to initially fix the keel frame on the tunnel.

[0018] Preferably, the inner wall of the arc-shaped connecting plate is provided with a plurality of clearance holes, and the plurality of clearance holes are connected to the plurality of screw holes one by one; one end of the bolt passes through the inner wall of the tunnel, and the other end is placed in the clearance hole.

[0019] Preferably, the keel frame further includes two arc-shaped embedded plates; the two arc-shaped embedded plates are respectively fixedly connected to the opposite sidewalls of the two arc-shaped connecting plates, and both arc-shaped embedded plates can fit against the inner wall of the tunnel; a first concrete layer is laid between the arc-shaped box and the tunnel, and the arc-shaped box is bonded to the inner wall of the first concrete layer; the arc-shaped embedded plates near the arc-shaped box are embedded in the first concrete layer to fix the keel frame in a secondary manner.

[0020] Preferably, multiple sets of the keel frame and the sound-absorbing components are provided, with each set of the keel frame and the sound-absorbing components corresponding one-to-one, and they are all arranged along the extension direction of the tunnel and fixedly installed on the inner wall of the tunnel; two adjacent sets of the keel frame are fixedly connected by a second concrete layer, and two adjacent arc-shaped connecting plates and two adjacent arc-shaped embedded plates are all embedded in the second concrete layer to fix the two adjacent sets of the keel frame together.

[0021] (III) Beneficial Effects

[0022] The beneficial effects of this utility model are:

[0023] This utility model discloses a tunnel noise reduction structure that, by incorporating sound-absorbing cotton, can absorb mid-to-high frequency noise. Specifically, the porous nature of the sound-absorbing cotton effectively absorbs mid-to-high frequency noise such as tire friction noise and engine exhaust noise. A sound-absorbing panel is incorporated, containing multiple spiral cavities. The inner wall of the panel has multiple first through-holes corresponding to and communicating with each spiral cavity, and the sound-absorbing cotton has multiple second through-holes corresponding to and communicating with each first through-hole. This allows noise to sequentially pass through the corresponding second and first through-holes into the corresponding spiral cavities, where it is repeatedly reflected. Because low-frequency noise has a longer wavelength, reflection within the spiral cavities extends its propagation distance and increases the reflection between the low-frequency noise and the walls of the spiral cavities, thereby converting the acoustic energy of the low-frequency noise into heat energy for dissipation, ensuring effective attenuation of the low-frequency noise. This invention utilizes a combination structure of sound-absorbing cotton and sound-absorbing panels to absorb mid-to-high frequency noise, while low-frequency noise is repeatedly reflected within the spiral cavity of the sound-absorbing panels. This process converts the acoustic energy of low-frequency noise into heat energy, thereby significantly attenuating low-frequency noise. As a result, it effectively absorbs and attenuates low-frequency, mid-frequency, and high-frequency noise within tunnels, reducing noise pollution and improving noise reduction efficiency and effectiveness. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall three-dimensional structure of a tunnel noise reduction structure according to the present invention;

[0025] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at point AA;

[0026] Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point A in the middle;

[0027] Figure 4 This is a schematic diagram of the overall three-dimensional structure of the sound-absorbing cotton in a tunnel noise reduction structure according to this utility model;

[0028] Figure 5 This is a three-dimensional schematic diagram of the overall structure of the sound-absorbing panel of the tunnel noise reduction structure according to this utility model;

[0029] Figure 6 This is a schematic diagram of the overall three-dimensional disassembly structure of the sound-absorbing panel of a tunnel noise reduction structure according to this utility model;

[0030] Figure 7This is a schematic diagram of the overall three-dimensional disassembly structure of the sound-absorbing component of a tunnel noise reduction structure according to this utility model;

[0031] Figure 8 This is a schematic diagram of the overall three-dimensional structure of the keel frame of a tunnel noise reduction structure according to the present invention;

[0032] Figure 9 for Figure 8 Enlarged schematic diagram of the structure at point B;

[0033] Figure 10 This is a partial cross-sectional structural diagram of the arc-shaped connecting plate of a tunnel noise reduction structure according to the present invention.

[0034] [Explanation of Labels in the Attached Image]

[0035] 1: Tunnel; 2: Sound-absorbing component; 21: Sound-absorbing cotton; 211: Second through hole; 212: Protrusion; 22: Sound-absorbing panel; 221: Arc-shaped box; 2211: First through hole; 222: Sound-absorbing component; 2221: Box body; 22211: Third through hole; 2222: Reflector; 3: Keel frame; 31: Keel frame; 311: Arc-shaped channel steel; 3111: Slot; 312: Arc-shaped connecting plate; 3121: Screw hole; 3122: Clearance hole; 313: Arc-shaped embedded plate; 4: Bolt; 5: First concrete layer; 6: Second concrete layer; a: Spiral cavity; b: Mounting cavity; c: Clip-on space. Detailed Implementation

[0036] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0037] Example

[0038] like Figure 1 As shown, a tunnel noise reduction structure in this embodiment includes an arc-shaped sound-absorbing component 2 arranged along the extension direction of the tunnel 1.

[0039] Specifically, such as Figure 2 and Figure 7 As shown, the sound-absorbing component 2 includes sound-absorbing cotton 21 and a sound-absorbing panel 22 with cavities. The outer wall of the sound-absorbing panel 22 is fixedly installed on the inner wall of the tunnel 1. The cavity of the sound-absorbing panel 22 is provided with multiple spiral cavities a, such as... Figure 2 , Figure 3 and Figure 5As shown, the inner wall of the sound-absorbing plate 22 has multiple first through holes 2211, which are connected one-to-one with multiple spiral cavities a, so that noise can enter the spiral cavity a through the first through holes 2211 and be repeatedly reflected, so as to convert sound energy into heat energy for dissipation. Figure 2 and picture Figure 4 As shown, sound-absorbing cotton 21 is bonded to the inner wall of sound-absorbing plate 22, and has multiple second through holes 211. These second through holes 211 are connected to multiple first through holes 2211 in a one-to-one correspondence. The sound-absorbing cotton 21 is used to absorb noise. By incorporating the sound-absorbing cotton 21, it can absorb mid-to-high frequency noise, effectively absorbing mid-to-high frequency noise such as tire friction noise and engine exhaust noise through the porous material characteristics of the sound-absorbing cotton 21 itself.

[0040] By setting up a sound-absorbing plate 22, and having multiple spiral cavities a inside the sound-absorbing plate 22, and multiple first through holes 2211 on the inner wall of the sound-absorbing plate 22 corresponding to and communicating with the multiple spiral cavities a, and multiple second through holes 211 on the sound-absorbing cotton 21 corresponding to and communicating with the multiple first through holes 2211, noise can be allowed to enter the corresponding spiral cavity a through the corresponding second through holes 211 and first through holes 2211 in sequence. The noise can be repeatedly reflected within the spiral cavity a. Since the wavelength of low-frequency noise is relatively long, the reflection of noise within the spiral cavity a can prolong the propagation distance of low-frequency noise and improve the reflection effect between low-frequency noise and the wall of the spiral cavity a, thereby converting the acoustic energy of low-frequency noise into heat energy for dissipation, ensuring that low-frequency noise is effectively attenuated.

[0041] Preferably, such as Figure 4 As shown, the inner wall of the sound-absorbing cotton 21 has multiple protrusions 212 to increase the contact area between the sound-absorbing cotton 21 and the noise, thereby further improving the absorption efficiency of mid-to-high frequency noise.

[0042] Furthermore, such as Figure 5 and Figure 6As shown, the sound-absorbing panel 22 includes an arc-shaped box 221 with cavities and multiple sound-absorbing components 222. The outer wall of the arc-shaped box 221 is fixedly installed on the inner wall of the tunnel 1, and the inner wall of the arc-shaped box 221 is bonded to the sound-absorbing cotton 21. Multiple first through holes 2211 are opened on the inner wall of the arc-shaped box 221, and an installation cavity b is opened inside the arc-shaped box 221. The multiple sound-absorbing components 222 are all fixedly installed in the installation cavity b, and the multiple sound-absorbing components 222 are arranged at intervals along the extension direction of the tunnel 1 and its inner wall, which can realize the change of the interval between two adjacent sound-absorbing components 222 according to different tunnels 1. That is, in the early stage of design, the arrangement of each sound-absorbing component 222 in the installation cavity b is arranged to ensure that it meets the noise reduction requirements and noise reduction effect of the current tunnel 1 and improves the noise reduction efficiency. Each sound-absorbing component 222 has a spiral cavity a inside, and each sound-absorbing component 222 has a third through hole 22211 on its side wall facing the sound-absorbing cotton 21, such as Figure 3 As shown, the third through hole 22211 is connected to the first through hole 2211 and the spiral cavity a respectively, so that the noise can pass through the corresponding connected second through hole 211, first through hole 2211 and third through hole 22211 in sequence and enter the corresponding spiral cavity a for repeated reflection, ensuring that the noise in the tunnel 1 can pass through the outer wall of the sound-absorbing cotton 21, the arc-shaped box 221 and the sound-absorbing component 222 and enter the spiral cavity a, so that the sound energy of the noise is converted into heat energy and dissipated.

[0043] It should be noted that the multiple sound-absorbing components 222 in this embodiment can be arranged according to the engineering design. That is, the multiple sound-absorbing components 222 can be fixedly installed in the arc-shaped box 221 at uniform intervals. When they are set at uniform intervals, the interval between two adjacent sound-absorbing components 222 is between 500mm and 1500mm. Of course, depending on the different noise reduction standards of tunnel 1, they can also be fixedly installed in the arc-shaped box 221 at different intervals. In actual construction design, the interval can be adjusted according to the curve of tunnel 1, traffic flow, and noise source distribution. For example, in noise-sensitive areas, such as at the tunnel entrance, a smaller interval of 500mm can be used to allow more noise to enter the spiral cavity a. In general areas, a larger interval of 1500mm can be used to allow noise that has not been absorbed by the sound-absorbing cotton 21 to enter the spiral cavity a, so that the noise at various locations in tunnel 1 can be absorbed more by the sound-absorbing cotton 21 and dissipated by the multiple sound-absorbing components 222, thereby achieving the best noise reduction effect. The arc-shaped enclosure 221 is fixedly connected by welding. One part of the arc-shaped enclosure 221 is a concave box, and the other part is a sealing plate. The third through hole 22211 is opened on the sealing plate. When installing multiple sound-absorbing components 222, the multiple sound-absorbing components 222 can be welded sequentially into the concave box according to the target positions. Then, the sealing plate is welded onto the concave box to seal it, thus completing the installation of the arc-shaped enclosure 221 and the sound-absorbing components 222.

[0044] Furthermore, such as Figure 7 As shown, the sound-absorbing component 222 includes a housing 2221 and a reflector 2222. The housing 2221 is fixedly installed inside the arc-shaped housing 221, and a third through hole 22211 is formed on the side wall of the housing 2221 facing the sound-absorbing cotton 21. The reflector 2222 is spiral-shaped and is fixedly installed inside the housing 2221. The reflector 2222 and the housing 2221 are coaxially arranged, and the reflector 2222 and the internal cavity of the housing 2221 form a spiral cavity a, so that noise can be repeatedly reflected from the wall surface of the reflector 2222. Noise not absorbed by the sound-absorbing cotton 21 can enter the housing 2221 through the second through hole 211, the first through hole 2211, and the third through hole 22211 in sequence. It then repeatedly reflects off the reflector 2222, extending the noise's propagation distance and allowing the noise to dissipate as heat energy. The number of spiral turns in the reflector 2222 can be adjusted according to specific construction goals. More turns result in more sound energy being converted into heat energy, leading to greater heat dissipation and a higher frequency of dissipated noise. Conversely, fewer turns result in less sound energy being converted into heat energy, leading to less heat dissipation and a lower frequency of dissipated noise.

[0045] In this embodiment, the box 2221 and the reflector 2222 of the sound-absorbing component 222 form an acoustic metamaterial, which is a special composite material or structure that achieves extraordinary acoustic properties not possessed by conventional materials or the substrates constituting the metamaterial through a certain ordered structural design at key physical scales. When noise waves are incident inside the structure, the energy of the sound waves is reduced due to the effects of different functional units such as local resonance, thus achieving a noise reduction effect. In other words, after the noise enters the helical cavity a in this embodiment, the noise waves are repeatedly reflected by the reflector 2222, thereby converting sound energy into heat energy and dissipating it, thus achieving a noise reduction effect. Meanwhile, to ensure that noise not absorbed by the sound-absorbing cotton 21 can enter the spiral cavity a for reflection, the inner diameter of the box 2221 ranges from 300mm to 800mm, the number of turns of the reflector 2222 ranges from 3 to 8, and the width of the spiral cavity a ranges from 20mm to 100mm. This ensures that the noise waves can be fully reflected within the spiral cavity a, thereby allowing the noise waves to better convert sound energy into heat energy for dissipation. Furthermore, the reflector 2222 can be fixedly installed inside the box 2221 by welding, and the box 2221 can be fixedly installed inside the mounting cavity b of the arc-shaped box 221 by welding for stable installation.

[0046] Furthermore, such as Figure 1 and Figure 8As shown, the tunnel noise reduction structure also includes a keel frame 3. The outer wall of the keel frame 3 is fixedly installed on the inner wall of the tunnel 1. The keel frame 3 has a snap-fit ​​space c inside, where the sound-absorbing panel 22 and the sound-absorbing cotton 21 are snapped in, so that the sound-absorbing component 2 is fixedly installed on the inner wall of the tunnel 1 through the keel frame 3. This ensures that the sound-absorbing component 2 is stably installed on the inner wall of the tunnel 1 through the keel frame 3, preventing the sound-absorbing component 2 from falling off the tunnel 1. Moreover, by snapping the sound-absorbing cotton 21 and the sound-absorbing panel 22 in the snap-fit ​​space c, the installation of the sound-absorbing component 2 on the keel frame 3 is more convenient, improving the ease of installation of the tunnel noise reduction structure.

[0047] Furthermore, such as Figure 8 As shown, the keel frame 3 includes two identical keel skeletons 31. Both keel skeletons 31 are arc-shaped and are spaced apart from each other along the extension direction of the tunnel 1, and are fixedly installed on the inner wall of the tunnel 1. Each of the two keel skeletons 31 has a slot 3111 on its opposite sidewall, forming a locking space c between the two slots 3111. The sound-absorbing panel 22 and the sound-absorbing cotton 21 are respectively inserted into the two slots 3111 along the two sidewalls of the tunnel 1, making it easier and faster to install the sound-absorbing cotton 21 and the sound-absorbing panel 22 onto the keel frame 3, thus improving the installation efficiency of the sound-absorbing component 2.

[0048] Furthermore, such as Figure 8 and Figure 9 As shown, the keel frame 31 includes an arc-shaped channel steel 311 and two arc-shaped connecting plates 312. The outer wall of the arc-shaped channel steel 311 fits against the inner wall of the tunnel 1, and the grooves of the two arc-shaped channel steels 311 are arranged opposite each other, and the grooves are slots 3111. The two arc-shaped connecting plates 312 are respectively fixedly connected to the two side walls of the arc-shaped channel steel 311 along the tunnel 1, and the outer walls of the two arc-shaped connecting plates 312 can fit against the inner wall of the tunnel 1. Multiple screw holes 3121 are opened on the two arc-shaped connecting plates 312. The arc-shaped connecting plates 312 are fixedly installed on the inner wall of the tunnel 1 by bolts 4 passing through their corresponding screw holes 3121, so as to initially fix the keel frame 31 onto the tunnel 1. By setting up an arc-shaped channel steel 311 and two arc-shaped connecting plates 312, and ensuring that the outer walls of both the arc-shaped channel steel 311 and the two arc-shaped connecting plates 312 can fit against the inner wall of tunnel 1, the keel frame 31 is made more stable when installed on the inner wall of tunnel 1. Furthermore, by connecting the two arc-shaped connecting plates 312 to both sides of the arc-shaped channel steel 311 along the extension direction of tunnel 1, and by providing multiple bolt holes 3121 for each arc-shaped connecting plate 312, the two arc-shaped connecting plates 312 can be fixedly installed on the inner wall of tunnel 1 using multiple bolts 4. This allows for the initial fixing of the keel frame 31 onto the inner wall of tunnel 1, facilitating the subsequent installation of the sound-absorbing components 2.

[0049] Preferably, the sound-absorbing cotton 21 and the sound-absorbing component 2 are inserted into the side wall and the inner wall of the snap-fit ​​space c to improve the structural integrity of the noise reduction structure and prevent the accumulation of dust and other pollutants.

[0050] Furthermore, such as Figure 1 , Figure 9 and Figure 10 As shown, the inner wall of the arc-shaped connecting plate 312 is also provided with multiple clearance holes 3122, which are connected one-to-one with multiple screw holes 3121. One end of the bolt 4 passes through the inner wall of the tunnel 1, and the other end is placed in the clearance hole 3122. The clearance hole 3122 can prevent the bolt 4 from being exposed and interfering with the installation of the sound-absorbing component 2, thereby improving the installation effect of the sound-absorbing component 2.

[0051] Furthermore, such as Figure 8 and Figure 9 As shown, the keel frame 31 also includes two arc-shaped embedded plates 313. The two arc-shaped embedded plates 313 are respectively fixedly connected to the opposite sidewalls of the two arc-shaped connecting plates 312, and both arc-shaped embedded plates 313 can fit against the inner wall of the tunnel 1. A first concrete layer 5 is laid between the arc-shaped box 221 and the tunnel 1, and the arc-shaped box 221 is bonded to the inner wall of the first concrete layer 5. The arc-shaped embedded plates 313 near the arc-shaped box 221 are embedded in the first concrete layer 5 to further fix the keel frame 31, thereby further improving the stability of the keel frame 3 after installation with the tunnel 1. Furthermore, by bonding the arc-shaped box 221 to the inner wall of the first concrete layer 5, installation of the arc-shaped box 221 on the inner wall of the first concrete layer 5 becomes more convenient and quick. This allows the sound-absorbing component 2 to be not only fixed by snapping it onto the keel frame 3, but also stably fixed by bonding it to the first concrete layer 5, further improving the installation stability of the sound-absorbing component 2 and preventing it from detaching from the tunnel 1 and the keel frame 3. The arc-shaped box 221 and the first concrete layer 5 can be bonded with epoxy resin adhesive. Epoxy resin adhesive is a type of adhesive based on epoxy resin, which usually needs to be used in conjunction with a curing agent for curing after mixing. It has excellent mechanical strength, chemical corrosion resistance, and heat resistance, and is widely used for bonding materials such as metals, ceramics, and plastics. In addition, the sound-absorbing cotton 21 and the arc-shaped enclosure 221 can also be bonded with epoxy resin adhesive so that the sound-absorbing cotton 21 can be better fixedly connected to the arc-shaped enclosure 221, preventing the sound-absorbing cotton 21 from falling off due to long time and improving the connection stability between the sound-absorbing cotton 21 and the arc-shaped enclosure 221.

[0052] Furthermore, such as Figure 1As shown, multiple sets of keel frames 3 and sound-absorbing components 2 are provided, with each set of keel frames 3 and sound-absorbing components 2 corresponding one-to-one, and they are all arranged along the extension direction of tunnel 1 and fixedly installed on the inner wall of tunnel 1. By setting multiple sets of sound-absorbing components 2 and multiple sets of keel frames 3, the sound-absorbing components 2 can be arranged along the extension direction of tunnel 1, so that the noise in tunnel 1 can be absorbed and dissipated by the sound-absorbing components 2, thereby reducing the noise inside the entire tunnel 1 and improving the noise reduction efficiency and effect. Two adjacent sets of keel frames 3 are fixedly connected by a second concrete layer 6, and two adjacent arc-shaped connecting plates 312 and two adjacent arc-shaped embedded plates 313 are embedded in the second concrete layer 6 to fix the two adjacent sets of keel frames 3. This forms a continuous and stable connection structure, which greatly improves the overall structural strength and stability between multiple sets of sound-absorbing components 2 and multiple sets of keel frames 3, avoids structural loosening due to the long tunnel length, and further improves the overall structural strength and stability of the tunnel noise reduction structure.

[0053] Preferably, the sound-absorbing cotton 21 and the arc-shaped box 221 in each group of sound-absorbing components 2 are pre-bonded, and the number of multiple sound-absorbing parts 222 in the arc-shaped box 221, as well as the number of rings of the reflector 2222 in each sound-absorbing part 222, are also pre-designed and processed by the factory according to the project construction. Moreover, each group of sound-absorbing components 2 can be divided into multiple sound-absorbing components 2 (not shown in the figure). That is to say, a group of sound-absorbing components 2 is composed of multiple small sound-absorbing components 2 spliced ​​together. That is, there are multiple sound-absorbing components 2 along the extension direction of the tunnel 1. In addition, a single sound-absorbing component 2 along the extension direction of the tunnel 1 can also be vertically divided into multiple small sound-absorbing components 2. This makes transportation and installation more convenient and prevents stress concentration damage to a whole sound-absorbing component 2 due to bumps and other factors during transportation. This reduces the damage rate of the sound-absorbing components 2. The smaller the sound-absorbing component 2, the less likely it is to be damaged.

[0054] It should be noted that the arc-shaped box 221, the housing 2221, the reflector 2222, and the keel frame 3 can be made of hard and dense metal materials such as aluminum alloy and stainless steel. This ensures that while maintaining the structural strength and integrity of the tunnel, sound waves can still be emitted. Noise not absorbed by the sound-absorbing cotton 21 can then pass through the second through-hole 211, the first through-hole 2211, and the third through-hole 22211 into the spiral cavity a, where it is repeatedly reflected by the reflector 2222, thus converting sound energy into heat energy for dissipation. Furthermore, the thicker the metal material, the better the reflection effect. Therefore, when designing the noise reduction structure, to ensure the passage of cars and trucks within the tunnel, the noise reduction structure should be maximized in thickness to better absorb and dissipate sound. Since the construction of each tunnel is different, this embodiment does not limit the dimensions of each component in the noise reduction structure; the specific dimensions depend on the construction design.

[0055] Based on the above structure, the installation principle of the tunnel noise reduction structure in this embodiment is as follows:

[0056] like Figures 1-10 As shown, firstly, according to the pre-designed sound-absorbing component 2 along the length of tunnel 1, two keel frames 31 are fixedly installed on the inner wall of tunnel 1 by bolts 4 through the clearance holes 3122 and screw holes 3121. Then, a template is erected on the inner wall of tunnel 1, and a first concrete layer 5 is laid inside the template. The arc-shaped embedded plates 313 of the two keel frames 31 facing the first concrete layer 5 are pre-embedded in the first concrete layer 5. The thickness of the first concrete layer 5 is the same as the thickness of the arc-shaped connecting plates 312 of the keel frames 31 facing the first concrete layer 5, and the side of the arc-shaped connecting plate 312 away from the arc-shaped channel steel 311 is adhesively connected to the first concrete layer 5 through the first concrete layer 5. After the first concrete layer 5 solidifies, each sound-absorbing component 2 is then bonded to the first concrete layer 5 with epoxy resin and inserted into the snap-fit ​​space c. Each time a sound-absorbing component 2 is bonded, epoxy resin is applied once until the entire inner wall of the first concrete layer 5 is bonded with sound-absorbing components 2. During bonding, the two small sound-absorbing components 2 inserted in the snap-fit ​​space c can be bonded to the inner wall of the first concrete layer 5.

[0057] After the sound-absorbing component 2 is stably bonded to the first concrete layer 5, the other keel frame 3 is fixedly installed on the inner wall of tunnel 1 according to the pre-designed position. The specific installation steps are as described above and will not be repeated here. After the keel frame 3 is fixed, the two keel frames 3 are connected by the second concrete layer 6. Then, the sound-absorbing component 2 is installed, which will not be repeated here. Figure 1 As shown.

[0058] Finally, following the above installation steps, the keel frame 3 and sound-absorbing components 2 were installed on the inner wall of tunnel 1.

[0059] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0060] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0061] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0062] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0063] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A tunnel noise reduction structure, characterized by, Includes an arc-shaped sound-absorbing component (2) arranged along the extension direction of the tunnel (1); The sound-absorbing component (2) includes sound-absorbing cotton (21) and a sound-absorbing plate (22) with a cavity. The outer wall of the sound-absorbing plate (22) is fixedly installed on the inner wall of the tunnel (1). The cavity of the sound-absorbing plate (22) is provided with a plurality of spiral cavities (a). The inner wall of the sound-absorbing plate (22) is provided with a plurality of first through holes (2211). The plurality of first through holes (2211) are connected to the plurality of spiral cavities (a) one by one, so that noise can enter the spiral cavity (a) through the first through holes (2211) and be repeatedly reflected, so as to convert sound energy into heat energy for dissipation. The sound-absorbing cotton (21) is bonded to the inner wall of the sound-absorbing plate (22), and a plurality of second through holes (211) are provided thereon. The plurality of second through holes (211) are connected to the plurality of first through holes (2211) one by one. The sound-absorbing cotton (21) is used to absorb noise.

2. The tunnel noise reduction structure as described in claim 1, characterized in that: The sound-absorbing panel (22) includes an arc-shaped box (221) with the cavity and a plurality of sound-absorbing components (222). The outer wall of the arc-shaped box (221) is fixedly installed on the inner wall of the tunnel (1). The inner wall of the arc-shaped box (221) is bonded to the sound-absorbing cotton (21). A plurality of first through holes (2211) are opened on the inner wall of the arc-shaped box (221). An installation cavity (b) is opened inside the arc-shaped box (221). Multiple sound-absorbing elements (222) are fixedly installed in the mounting cavity (b), and the multiple sound-absorbing elements (222) are arranged at intervals along the extension direction of the tunnel (1) and its inner wall; Each of the sound-absorbing components (222) has a spiral cavity (a) inside, and each of the sound-absorbing components (222) has a third through hole (22211) on its sidewall facing the sound-absorbing cotton (21). The third through hole (22211) is connected to the first through hole (2211) and the spiral cavity (a) respectively, so that the noise can pass through the corresponding connected second through hole (211), first through hole (2211) and third through hole (22211) in sequence and enter the corresponding spiral cavity (a) for repeated reflection.

3. The tunnel noise reduction structure as described in claim 2, characterized in that: The sound-absorbing component (222) includes a housing (2221) and a reflector (2222); The box body (2221) is fixedly installed inside the arc-shaped box body (221), and the third through hole (22211) is opened on the side wall of the box body (2221) facing the sound-absorbing cotton (21); The reflector (2222) is spiral-shaped and is fixedly installed inside the box (2221). The reflector (2222) and the box (2221) are coaxially arranged. The reflector (2222) and the internal cavity of the box (2221) form the spiral cavity (a) so that the noise can be repeatedly reflected by the wall of the reflector (2222).

4. The tunnel noise reduction structure as described in claim 1, characterized in that: The inner wall of the sound-absorbing cotton (21) is provided with a plurality of protrusions (212) to increase the contact area between the sound-absorbing cotton (21) and the noise.

5. The tunnel noise reduction structure as described in claim 2, characterized in that: The tunnel noise reduction structure also includes a keel frame (3). The outer wall of the keel frame (3) is fixedly installed on the inner wall of the tunnel (1). The keel frame (3) has a snap-fit ​​space (c) inside. The sound-absorbing plate (22) and the sound-absorbing cotton (21) are snapped in the snap-fit ​​space (c) so that the sound-absorbing component (2) is fixedly installed on the inner wall of the tunnel (1) through the keel frame (3).

6. The tunnel noise reduction structure as described in claim 5, characterized in that: The keel frame (3) includes two keel skeletons (31) with identical structures. Both of the keel frames (31) are arc-shaped, and the two keel frames (31) are arranged at intervals opposite each other along the extension direction of the tunnel (1) and are fixedly installed on the inner wall of the tunnel (1); The two keel frames (31) are provided with slots (3111) on opposite side walls, and the two slots (3111) form the snap-fit ​​space (c). The sound-absorbing plate (22) and the sound-absorbing cotton (21) are respectively inserted into the two slots (3111) along the two side walls of the tunnel (1).

7. The tunnel noise reduction structure as described in claim 6, characterized in that: The keel frame (31) includes an arc-shaped channel steel (311) and two arc-shaped connecting plates (312). The outer wall of the arc-shaped channel steel (311) is attached to the inner wall of the tunnel (1), and the grooves of the two arc-shaped channel steels (311) are arranged opposite to each other, and the grooves are the slots (3111). The two arc-shaped connecting plates (312) are respectively fixedly connected to the arc-shaped channel steel (311) on both sides of the tunnel (1), and the outer walls of the two arc-shaped connecting plates (312) can fit against the inner wall of the tunnel (1). Multiple screw holes (3121) are provided on the two arc-shaped connecting plates (312). The arc-shaped connecting plates (312) are fixedly installed on the inner wall of the tunnel (1) by bolts (4) passing through their corresponding screw holes (3121) so as to initially fix the keel frame (31) on the tunnel (1).

8. The tunnel noise reduction structure as described in claim 7, characterized in that: The inner wall of the arc-shaped connecting plate (312) is also provided with a plurality of clearance holes (3122), and the plurality of clearance holes (3122) are connected to the plurality of screw holes (3121) one by one; One end of the bolt (4) is inserted through the inner wall of the tunnel (1), and the other end is placed in the clearance hole (3122).

9. The tunnel noise reduction structure as described in claim 8, characterized in that: The keel frame (31) also includes two arc-shaped embedded plates (313). The two arc-shaped embedded plates (313) are respectively fixedly connected to the opposite sidewalls of the two arc-shaped connecting plates (312), and the two arc-shaped embedded plates (313) can fit against the inner wall of the tunnel (1); A first concrete layer (5) is laid between the arc-shaped box (221) and the tunnel (1), and the arc-shaped box (221) is bonded to the inner wall of the first concrete layer (5); The arc-shaped embedded plate (313) near the arc-shaped box (221) is embedded in the first concrete layer (5) to fix the keel frame (31) for a second time.

10. The tunnel noise reduction structure as described in claim 9, characterized in that: The keel frame (3) and the sound absorption component (2) are provided in multiple sets. The multiple sets of the keel frame (3) and the multiple sets of the sound absorption component (2) correspond one-to-one, and they are arranged along the extension direction of the tunnel (1) and fixedly installed on the inner wall of the tunnel (1). The two adjacent sets of the keel frames (3) are fixedly connected by the second concrete layer (6), and the two adjacent arc-shaped connecting plates (312) and the two adjacent arc-shaped embedded plates (313) are all embedded in the second concrete layer (6) to fix the two adjacent sets of the keel frames (3).

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