A reconstituted bamboo sound barrier and its manufacturing method

Abstract

This invention discloses a reconstituted bamboo sound barrier and its manufacturing method, relating to the field of sound barrier technology. Specifically, it is a reconstituted bamboo sound barrier comprising spaced, inclined columns, with standard modular screen bodies fixed between the columns by clamping angle steel. The screen body uses a reconstituted bamboo main screen body as the core sound-absorbing body, combined with reconstituted bamboo panels, reconstituted bamboo cavities, reinforcing frames, and other components. The reconstituted bamboo panels have 0.3mm-1.0mm micro-perforations, forming an auxiliary sound-absorbing structure with the sealed reconstituted bamboo cavities, enhancing the sound absorption effect of the reconstituted bamboo main screen body. The diffusion texture of the reconstituted bamboo main screen body disperses reflected sound waves, improving the uniformity of the sound field, allowing more sound energy to "penetrate" into the sound-absorbing material and be consumed. The manufacturing process involves bamboo bundle pretreatment, shaping, and assembly, resulting in a product with low cost, light weight, good durability, environmental friendliness, and excellent acoustic performance, suitable for noise control on highways, railways, and other road sections.

Description

Technical Field

[0001] This invention relates to the field of sound barrier technology, specifically to a reconstituted bamboo sound barrier and its manufacturing method. Background Technology

[0002] With the rapid development of transportation infrastructure, noise pollution along highways has become increasingly prominent, making sound barriers a key device for controlling noise propagation. Existing sound barriers are mostly made of metal, glass, or concrete, which have significant drawbacks: metal materials are expensive; concrete, while inexpensive, is heavy, difficult to construct, and requires stringent support foundations, increasing overall costs; glass is easily broken, lacking safety and durability. Furthermore, these traditional materials generate substantial carbon emissions during production, contradicting current energy conservation, emission reduction, and environmental protection principles. To address the contradictions between material cost, construction difficulty, environmental friendliness, and acoustic performance in existing technologies, we propose a reconstituted bamboo sound barrier and its manufacturing method. Summary of the Invention

[0003] This invention provides a reconstituted bamboo sound barrier and its manufacturing method, which solves the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A reconstituted bamboo sound barrier includes columns, the upper ends of which are inclined towards the road side. The columns are spaced apart, and standard modular screens are installed between them. Each standard modular screen includes a pad, a reconstituted bamboo cavity, a reinforcing frame, and a reconstituted bamboo main screen. A pad is installed on one side of the reinforcing frame, and a reconstituted bamboo cavity is installed in the middle of the pad. One side of the reconstituted bamboo cavity is fixedly connected to the reinforcing frame, and the interior of the reconstituted bamboo cavity is a sealed air layer. The other side of the reinforcing frame has the reconstituted bamboo main screen, and one side of the reconstituted bamboo main screen has a diffusion texture. Multiple clamping angle steels are installed on the columns from top to bottom, which can clamp and fix the standard modular screens. A column cover is installed on the top of the standard modular screens between the columns.

[0005] Preferably, a reconstituted bamboo panel is installed on the other side of the pad, and the reconstituted bamboo panel is in contact with the reconstituted bamboo cavity. The other side surface of the reconstituted bamboo panel is also provided with an array of micro-perforations.

[0006] Preferably, a waterproof and breathable membrane is installed on one side of the reconstituted bamboo main screen with a diffusion texture, and a reconstituted bamboo protective plate is installed on the other side of the waterproof and breathable membrane. One side of the reconstituted bamboo protective plate abuts against the clamping angle steel, and the reconstituted bamboo protective plate can prevent the waterproof and breathable membrane from being exposed to the outside world.

[0007] Preferably, the reinforcing frame is recessed inward at both ends near the column, and a sealing strip is installed at the recessed end. The standard modular screen body is installed with a sealing strip at the inclined corner along the column. The two sides of the sealing strip abut against the reconstituted bamboo main screen body and the pad respectively. One side of the sealing strip abuts against the reconstituted bamboo main screen body, and the other side passes through the pad and abuts against the reconstituted bamboo panel.

[0008] Preferably, the outer surfaces of the reconstituted bamboo panel and the reconstituted bamboo main screen are coated with a weather-resistant coating.

[0009] Preferably, the outer surface of the reconstituted bamboo protective board is coated with a weather-resistant coating.

[0010] Preferably, the diameter of the micro-perforations is 0.3mm-1.0mm, and the depth is the same as the thickness of the reconstituted bamboo panel.

[0011] Preferably, the lower end of the column is equipped with fixed foot plates on both sides, and the bottom of the column is fixedly connected to a fixed base. The bottom of the fixed foot plates is fixedly connected to the fixed base, and bolts pass through the corners of the fixed base and are fixedly connected to the roadbed on both sides of the road.

[0012] A method for manufacturing a reconstituted bamboo sound barrier includes the following steps: Step 1: The raw bamboo is broken into bundles, and then pretreated by drying and soaking in a composite agent for preservation, insect prevention, and flame retardancy.

[0013] Step 2: The pre-treated bamboo bundles are oriented and laid out into blanks, and then glued together in a hot press under high temperature and high pressure to form large-format reconstituted bamboo substrate boards.

[0014] Step 3: Sand the substrate board to a fixed thickness, then dip or spray an outdoor weather-resistant resin coating and cure it; then, according to the acoustic design, perform CNC micro-perforation on the board as a reconstituted bamboo panel.

[0015] Step 4: Cut the processed boards according to the design dimensions to create an internal reinforcing frame.

[0016] Step 5: In a special mold, place the reconstituted bamboo protective board, waterproof and breathable membrane, reconstituted bamboo main screen, reinforcing frame, padding block to ensure the thickness and protection of the cavity layer, reconstituted bamboo cavity, and reconstituted bamboo panel in sequence. Use environmentally friendly structural adhesive to bond them together and supplement them with mechanical connection to form a standard modular screen.

[0017] Step 6: The finished modules are cured in a constant temperature and humidity environment, and then their appearance, dimensions, connection strength, and sampled acoustic performance are tested.

[0018] Step 7: On the roadbed with the pre-embedded columns, first install sealing strip one and sealing strip two at both ends of the qualified standard modular screen body, then fix the standard modular screen body between the columns by clamping angle steel, and then install the column cover plate.

[0019] Preferably, the drying process in step 1 requires drying to a moisture content of 8%-12%, and the high temperature in the hot press in step 2 is 140-160 degrees Celsius, and the high pressure is 5-8 MPa.

[0020] The present invention has the following beneficial effects: 1. This reconstituted bamboo sound barrier has a significant sound absorption effect. The reconstituted bamboo main screen, as the core sound absorption body, has excellent sound absorption performance. The micro-perforations of the reconstituted bamboo panel and the hollow body of the reconstituted bamboo form an auxiliary sound absorption system, which further enhances the sound absorption efficiency of the main screen, especially optimizing the sound absorption effect of traffic noise. At the same time, the diffusion texture of the main screen disperses reflected sound waves, avoids sound focusing, makes the sound field more uniform, and allows more sound to "penetrate" into the interior of the sound absorption material and be consumed, thus comprehensively improving the noise reduction quality.

[0021] 2. The reconstituted bamboo sound barrier has cost and construction advantages: the reconstituted bamboo material is low in cost and light in weight, which reduces the requirements for the support foundation, significantly reducing construction difficulty and overall cost; the standard modular design facilitates assembly, disassembly and maintenance, effectively improving construction efficiency and shortening the construction period.

[0022] 3. This reconstituted bamboo sound barrier is outstanding in terms of durability and environmental protection. The reconstituted bamboo is treated with anti-corrosion, insect-proof and flame-retardant treatment, and the outer surface of key components is coated with a weather-resistant coating to ensure long-term stable use of the barrier in outdoor environments. Bamboo can absorb a large amount of carbon dioxide during its growth process, and the carbon emissions during the production process are low, which meets the requirements of energy conservation, emission reduction and environmental protection, and has ecological benefits.

[0023] 4. This reconstituted bamboo sound barrier has a stable and reliable structure; the reinforced frame significantly improves the structural rigidity and deformation resistance of the barrier body, and the pads can effectively guarantee the installation space of the reconstituted bamboo cavity, avoiding the reduction of auxiliary sound absorption effect due to compression deformation, thereby ensuring the overall sound absorption performance is stable and extending the product's service life. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is an enlarged structural diagram of point A in the present invention; Figure 3 This is a schematic diagram of the panel structure of the present invention; Figure 4 This is an enlarged structural diagram of section B in the present invention; Figure 5 This is a schematic cross-sectional view of the present invention; Figure 6 This is a schematic diagram of the back structure of the present invention; In the diagram: 1. Column; 2. Column cover; 3. Angle steel clamping; 4. Fixed base; 5. Bolt; 6. Fixed foot plate; 7. Reconstituted bamboo panel; 8. Pad; 9. Sealing strip one; 10. Sealing strip two; 11. Waterproof and breathable membrane; 12. Reconstituted bamboo protective board; 13. Reconstituted bamboo main screen; 15. Micro-perforation; 16. Reconstituted bamboo hollow body; 17. Reinforcing frame; 18. Diffusion texture. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Please see Figures 1 to 6 This invention provides a reconstituted bamboo sound barrier, comprising columns 1, the upper ends of which are inclined towards the road side. The columns 1 are spaced apart, and standard modular screen bodies are installed between the columns 1. Each standard modular screen body includes pads 8, reconstituted bamboo hollow bodies 16, reinforcing frames 17, and reconstituted bamboo main screen bodies 13. A pad 8 is installed on one side of the reinforcing frame 17, and a reconstituted bamboo hollow body 16 is installed in the middle of the pad 8. One side of the reconstituted bamboo hollow body 16 is fixedly connected to the reinforcing frame 17, and the interior of the reconstituted bamboo hollow body 16 is a sealed air layer. The reconstituted bamboo main screen body 13 is installed on the other side of the reinforcing frame 17, and one side of the reconstituted bamboo main screen body 13 is processed with a diffusion texture 18. Multiple clamping angle steels 3 are installed on the columns 1 from top to bottom, and the clamping angle steels 3 can clamp and fix the standard modular screen bodies. A column cover plate 2 is installed on the top of the standard modular screen bodies between the columns 1.

[0027] Based on the above, the upper end of column 1 is tilted towards the road side to maximize the reception of noise waves propagating from the road and reduce sound wave diffraction loss; the spaced columns 1 form a stable support structure, and the standard modular screen is fixed by clamping angle steel 3 to ensure that the screen and column 1 are tightly connected and to prevent noise from leaking from the gaps; the sealed air layer of the reconstituted bamboo cavity 16 consumes low-frequency sound energy through vibration damping, making up for the sound absorption shortcomings of the core sound-absorbing body in the low-frequency range; the diffusion texture 18 of the reconstituted bamboo main screen 13 disperses the concentrated directional reflected sound waves into multi-directional, out-of-phase weak scattered waves through the uneven surface, eliminating sound focusing and making the sound field more uniform and more "penetrating" into the sound-absorbing material for consumption; the column cover 2 covers the top of the screen and the gaps between columns 1, which not only prevents rainwater from eroding the connection, but also blocks the noise diffraction channel and improves the overall noise reduction sealing performance; Furthermore, the inclined column 1 design improves noise reception efficiency and enhances the targeting of noise reduction; the standard modular screen is easy to install and facilitates later maintenance and replacement; the reconstituted bamboo cavity 16 achieves efficient absorption of low-frequency noise and broadens the noise reduction spectrum range; the diffusion texture 18 avoids secondary reflection noise interference and optimizes the sound field environment; the column cover 2 takes into account both protection and sealing functions, extends the service life of the equipment and ensures the stability of the noise reduction effect.

[0028] Please see Figures 1 to 4 On the other side of the pad 8, a reconstituted bamboo panel 7 is installed, and the reconstituted bamboo panel 7 is in contact with the reconstituted bamboo cavity 16. The other side surface of the reconstituted bamboo panel 7 is also provided with an array of micro-perforations 15.

[0029] Based on the above, the micro-perforations 15 on the surface of the reconstituted bamboo panel 7 and the reconstituted bamboo cavity 16 constitute a resonant sound absorption system. When sound waves are incident, the air molecules at the neck of the perforation rub violently against the hole wall and are accompanied by thermal motion, converting sound energy into heat energy and dissipating it. The resonant frequency can be specifically matched to the main spectrum range of traffic noise (500Hz-2000Hz), enhancing the absorption of mid-to-high frequency noise. The decorative texture 14 does not affect the acoustic performance while improving the appearance, making the sound barrier more suitable for the surrounding environment. Furthermore, the micro-perforations 15 and the reconstituted bamboo cavity 16 work together to significantly improve the sound absorption efficiency of mid-to-high frequency noise, specifically addressing the problem of traffic noise pollution; the decorative texture 14 increases the practicality and aesthetics of the product, reducing the visual interference of the sound barrier on the surrounding environment; the reconstituted bamboo panel 7 and the reconstituted bamboo cavity 16 are in direct contact, ensuring the structural stability of the resonant sound absorption system and guaranteeing the consistency of the sound absorption effect.

[0030] Please see Figures 1 to 6 The main body 13 of the reconstituted bamboo is equipped with a waterproof and breathable membrane 11 on one side with a diffusion texture 18. The other side of the waterproof and breathable membrane 11 is equipped with a reconstituted bamboo protective board 12. One side of the reconstituted bamboo protective board 12 abuts against the clamping angle steel 3, and the reconstituted bamboo protective board 12 can prevent the waterproof and breathable membrane 11 from being exposed to the outside world. The model of the above waterproof and breathable membrane is: GORE-GAW337 or GORE-GAW338.

[0031] Based on the above, the waterproof and breathable membrane 11 achieves the function of "breathable but not leaking water", expelling the moisture inside the reconstituted bamboo main screen 13 and blocking the intrusion of external rainwater, thus preventing the reconstituted bamboo main screen 13 from deteriorating in sound absorption performance or becoming moldy and damaged due to moisture, and ensuring the long-term stable operation of the core sound absorption body; the reconstituted bamboo protective board 12 forms physical protection for the waterproof and breathable membrane 11, preventing it from being scratched or damaged by external forces, and at the same time, by abutting against the clamping angle steel 3, it further fixes the screen structure and ensures the stability of the relative positions of each component; Furthermore, the waterproof and breathable membrane 11 extends the service life of the reconstituted bamboo main screen 13 and maintains the long-term stability of the core sound absorption performance; the reconstituted bamboo protective board 12 improves the overall structure and damage resistance of the screen and avoids the failure of the protective membrane from affecting the operation of the equipment; the two work together to achieve multiple functions of "protection-moisture-stabilization structure" and enhance the outdoor adaptability of the sound barrier.

[0032] Please see Figures 1 to 2 The reinforcing frame 17 is recessed inward at both ends near the column 1, and a sealing strip 9 is installed at the recessed end. The standard modular screen body is equipped with a sealing strip 10 at the inclined corner along the column 1. The two sides of the sealing strip 19 abut against the reconstituted bamboo main screen body 13 and the pad 8, respectively. One side of the sealing strip 10 abuts against the reconstituted bamboo main screen body 13, and the other side passes through the pad 8 and abuts against the reconstituted bamboo panel 7.

[0033] Based on the above, sealing strip 9 and sealing strip 10 form a full-circumferential sealing structure, filling the gaps between internal components of the screen and the connection gap between the screen and the column 1, preventing noise from penetrating through the gaps and forming a "sound bridge", ensuring that noise is mainly treated through the sound absorption structure rather than leaking and propagating; the recessed design at both ends of the reinforced frame 17 provides space for the installation of the sealing strip, while enhancing the tightness of the connection between the frame and each component. Furthermore, the dual sealing strip design enhances overall sealing performance, reduces noise leakage, and ensures noise reduction effect; the sealing strips fit tightly against each component, achieving both sealing function and assisting in fixing the component position, thus enhancing the stability of the screen structure; the installation method is simple and reliable, achieving efficient sealing without complex processes.

[0034] Please see Figures 1 to 6 Both the outer surfaces of the reconstituted bamboo panel 7 and the reconstituted bamboo main screen 13 are coated with a weather-resistant coating.

[0035] Based on the above, the weather-resistant coating can resist the effects of outdoor ultraviolet radiation, wind and rain erosion, temperature changes and other environmental factors, prevent the reconstituted bamboo panel 7 and the reconstituted bamboo main screen 13 from cracking, deformation and aging, and extend the service life of the components. The above weather-resistant coating models are: DuPont-Fluorocarbon Coating-FEVE-PVDF-5000 or AkzoNobel-Fluorocarbon Coating-Interpon-200. Furthermore, the weather-resistant coating enhances the outdoor durability of the sound barrier and reduces subsequent maintenance costs; the coating is highly compatible with reconstituted bamboo materials, is not easily peeled off with long-term use, and ensures stable protective effects.

[0036] Please see Figures 1 to 6 The outer surface of the reconstituted bamboo protective board 12 is coated with a weather-resistant coating.

[0037] Based on the above, the weather-resistant coating provides outdoor protection for the reconstituted bamboo protective board 12, resists environmental erosion, prevents deformation and damage to the protective board, and ensures its long-term effectiveness in protecting the waterproof and breathable membrane 11; at the same time, it improves the wear resistance of the protective board surface, reduces damage to the board body from external forces, and maintains the overall structural integrity of the screen. The above weather-resistant coating models are: DuPont-Fluorocarbon Coating-FEVE-PVDF-5000 or AkzoNobel-Fluorocarbon Coating-Interpon-200. Furthermore, it extends the service life of the reconstituted bamboo protective panel 12, ensuring that the protective film remains in a safe and protective state for a long time; it improves the overall weather resistance of the screen, making the sound barrier suitable for different climatic environments; the coating has both protective and aesthetic functions, maintaining the clean appearance of the product.

[0038] Please see Figures 1 to 4 The diameter of the micro-perforations 15 is 0.3mm-1.0mm, and the depth is the same as the thickness of the reconstituted bamboo panel 7.

[0039] Based on the above, the micro-perforations 15 within this size range, together with parameters such as the thickness of the reconstituted bamboo panel 7 and the depth of the reconstituted bamboo cavity 16, form a resonant sound absorption system that can accurately match the main spectrum of traffic noise (500Hz-2000Hz) and achieve the best sound absorption effect in this frequency band; the perforation depth is the same as the panel thickness, ensuring that sound waves can smoothly enter the cavity and avoiding the impact of sound energy conversion efficiency due to shallow perforations. Furthermore, the precise size design makes the sound absorption system more targeted, significantly improving the effect of traffic noise control; the standardized perforation parameters facilitate mass production and processing, improving production efficiency; and it ensures a smooth sound wave propagation path, guarantees the efficiency of sound energy conversion and consumption, and improves the overall noise reduction quality.

[0040] Please see Figure 1 Fixed foot plates 6 are installed on both sides of the lower end of the column 1, and a fixed base 4 is fixedly connected to the bottom of the column 1. The bottom of the fixed foot plate 6 is fixedly connected to the fixed base 4. A bolt 5 passes through the corner of the fixed base 4 and is fixedly connected to the roadbed on both sides of the road.

[0041] Based on the above, the fixed base 4, the fixed foot plate 6, and the bolts 5 work together to firmly fix the column 1 to the roadbed, forming a stable support carrier to resist the action of external forces such as wind and prevent the column 1 from shifting or tilting; the fixed foot plate 6 increases the contact area between the column 1 and the base, disperses pressure, and improves the connection stability; the detachable connection of the bolts 5 facilitates installation and subsequent maintenance and adjustment. Furthermore, the multi-point fixing structure ensures that the column 1 is firmly installed, providing stable support for the screen body and ensuring the safety and reliability of the overall structure; the distributed pressure design reduces the local load requirements on the roadbed and expands the scope of application; the detachable connection method improves construction flexibility, reduces installation and maintenance difficulty, and shortens the construction period.

[0042] The present invention also provides a method for manufacturing a reconstituted bamboo sound barrier, comprising the following steps: Step 1: The raw bamboo is broken into bundles, and then pretreated by drying and soaking in a composite agent for preservation, insect prevention, and flame retardancy.

[0043] Step 2: The pre-treated bamboo bundles are oriented and laid out into blanks, and then glued together in a hot press under high temperature and high pressure to form large-format reconstituted bamboo substrate boards.

[0044] Step 3: Sand the substrate board to a fixed thickness, then dip or spray an outdoor weather-resistant resin coating and cure it; then, according to the acoustic design, perform CNC micro-perforation on the board as a reconstituted bamboo panel.

[0045] Step 4: Cut the processed boards according to the design dimensions to create an internal reinforcing frame.

[0046] Step 5: In a special mold, place the reconstituted bamboo protective board, waterproof and breathable membrane, reconstituted bamboo main screen, reinforcing frame, padding block to ensure the thickness and protection of the cavity layer, reconstituted bamboo cavity, and reconstituted bamboo panel in sequence. Use environmentally friendly structural adhesive to bond them together and supplement them with mechanical connection to form a standard modular screen.

[0047] Step 6: The finished modules are cured in a constant temperature and humidity environment, and then their appearance, dimensions, connection strength, and sampled acoustic performance are tested.

[0048] Step 7: On the roadbed with the pre-embedded columns, first install sealing strip one and sealing strip two at both ends of the qualified standard modular screen body, then fix the standard modular screen body between the columns by clamping angle steel, and then install the column cover plate.

[0049] In a preferred embodiment, the drying in step 1 requires drying to a moisture content of 8%-12%, and the high temperature in the hot press in step 2 is 140-160 degrees Celsius, and the high pressure is 5-8 MPa.

[0050] Implementation Column 1 This embodiment provides a reconstituted bamboo sound barrier and its manufacturing method, including the following steps: Step 1: The raw bamboo is mechanically combed into continuous bamboo bundles and dried to a moisture content of 8%-12% using a hot air circulation drying process. Then, it is placed in a high-pressure impregnation tank and injected with a composite agent for corrosion prevention, insect prevention, and flame retardancy. The mixture is impregnated for 30-40 minutes under a pressure of 0.3-0.5MPa to ensure that the agent fully penetrates the interior of the bamboo bundles and completes the bamboo pretreatment.

[0051] Step 2: Arrange the pre-treated bamboo bundles in a bidirectional cross pattern, with 60% of the bamboo bundles running longitudinally and 40% running transversely. Place the bundles in a multi-layer hot press and glue them together under constant temperature and pressure at 150-160 degrees Celsius and 6-8 MPa. The heat and pressure holding time is controlled at 25-30 minutes to produce a large-format reconstituted bamboo substrate board with uniform density and superior mechanical strength. After molding, allow it to cool naturally to room temperature.

[0052] Step 3: Perform thickness sanding on the substrate to ensure a thickness tolerance of ≤ ±0.2mm; then uniformly spray an outdoor weather-resistant fluorocarbon coating (model: DuPont) using an electrostatic spraying process. FEVEPVDF5000 is cured in a constant temperature oven at 80-100 degrees Celsius for 2 hours; for boards made of reconstituted bamboo panels, laser micro-perforation technology is used to create an array of micro-perforations 15, with a perforation diameter of 0.3mm-1.0mm and a hole spacing of 3-5mm, ensuring that the perforation rate is precisely controlled at 3%-5%.

[0053] Step 4: According to the design dimensions of the screen, use a CNC cutting machine to precisely cut the coated and cured board to produce the reconstituted bamboo panel 7, the reconstituted bamboo main screen 13, the reconstituted bamboo protective panel 12 and the reinforcing frame 17; the reinforcing frame 17 adopts a mortise and tenon structure splicing, and environmentally friendly structural adhesive is applied to the splicing points and reinforced with stainless steel screws to improve the overall rigidity of the frame.

[0054] Step 5: On the automated assembly line, place the components in the following order: "reconstituted bamboo panel 7 → reconstituted bamboo cavity 16 → pad 8 → reinforcing frame 17 → reconstituted bamboo main screen 13 → waterproof and breathable membrane 11 → reconstituted bamboo protective board 12". Maintain a preset pressure of 0.5-1MPa through a mechanical pressurization device, and automatically inject environmentally friendly structural adhesive. After the adhesive is bonded, use ultrasonic testing to check the bonding quality to ensure that there is no loose bonding or delamination, and then composite into a standard modular screen.

[0055] Step 6: Place the composite standard modular screen into the intelligent curing room and cure it for 72 hours at a temperature of 20±2 degrees Celsius and a humidity of 50%±5%. After curing, conduct a full range of tests in sequence, including no cracks in appearance, no peeling of coating, dimensional tolerance ≤±1mm, connection strength pull-out force ≥2.5MPa, and acoustic performance sound absorption coefficient ≥0.6 in the 500Hz-2000Hz frequency band. Unqualified products are returned for rework.

[0056] Step 7: At the construction site, first, fix the column 1 firmly to the roadbed using the fixed base 4, fixed foot plate 6 and bolts 5, and adjust the verticality and tilt angle of the column 1 to meet the design requirements; then, hoist the qualified standard modular screen body between the columns 1, embed sealing strip 1 9 and sealing strip 2 10 into the slots at both ends of the screen body, and use an electric wrench to operate the clamping angle steel 3 to evenly press the screen body from top to bottom. Finally, install the column cover plate 2 and perform edge sealing treatment to complete the overall assembly.

[0057] Based on the above, the manufacturing process involves first separating the raw bamboo into bundles, drying them to a moisture content of 8%-12%, and then impregnating them with a preservative-resistant, insect-resistant, and flame-retardant composite agent. This process disrupts the natural texture of the bamboo to facilitate subsequent molding, while also preventing deformation and cracking after molding and forming a durable protective layer. Subsequently, the pretreated bamboo bundles are oriented and assembled, and then glued together under high temperature and pressure (140-160 degrees Celsius, 5-8 MPa) to create a large-format reconstituted bamboo substrate board with a dense structure and high strength, reducing seams to avoid noise leakage. The substrate board is sanded to a fixed thickness to ensure assembly accuracy and enhance the reliability and consistency of acoustic performance. An outdoor weather-resistant resin coating is then applied by impregnation or spraying to enhance weather resistance. Finally, micro-perforations of 0.3mm-1.0mm are precisely fabricated using CNC micro-perforation to ensure resonance absorption with the reconstituted bamboo cavity. The sound system is constructed by cutting boards to the design dimensions to create a reinforced frame. The boards are then assembled in a specialized mold in the following order: reconstituted bamboo protective board, waterproof and breathable membrane, reconstituted bamboo main screen, reinforced frame, pads, reconstituted bamboo hollow body, and reconstituted bamboo panel. These components are bonded together using environmentally friendly structural adhesive and mechanical connections to form a standard modular screen. The waterproof and breathable membrane ensures "breathability without leakage" to keep the main screen dry. Pads guarantee the installation space and shape of the hollow body, and the reinforced frame enhances structural rigidity. The finished modules undergo constant temperature and humidity curing to promote adhesive hardening, followed by multi-dimensional quality control. During installation, on the roadbed with pre-embedded columns, sealing strips one and two are first installed on the screen. Then, angle steel is used to fix the screen between the spaced, inclined columns. Finally, column covers are installed to form a full-circumferential seal and stable fixation. Furthermore, it boasts excellent acoustic performance. The core sound absorption function of the reconstituted bamboo main screen, combined with the auxiliary sound absorption functions of the micro-perforations and reconstituted bamboo cavities, along with diffusion textures to optimize the sound field, achieves efficient noise reduction across the entire frequency range. In particular, it can accurately match the main spectrum of traffic noise from 500Hz to 2000Hz, resulting in a comprehensive improvement in noise reduction quality. It also offers significant cost and construction advantages. The reconstituted bamboo material is low in cost and lightweight, significantly reducing the requirements for the support foundation and the overall cost. The standard modular design and detachable connection method facilitate assembly, disassembly, maintenance, and replacement, effectively improving construction efficiency and shortening the construction period. Finally, it combines durability and environmental friendliness. The reconstituted bamboo undergoes anti-corrosion, insect-proofing, and flame-retardant treatment. Key components are coated with a weather-resistant coating, combined with a waterproof and breathable membrane and reconstituted bamboo protective panels, which can resist outdoor ultraviolet rays, wind and rain, and other environmental erosion, extending their service life. In addition, bamboo absorbs a large amount of carbon dioxide during its growth, resulting in low carbon emissions during the production process. The use of environmentally friendly structural adhesives further aligns with the concept of energy conservation and emission reduction, and also has ecological benefits. The structure is stable and reliable. The reinforced frame significantly improves the rigidity and deformation resistance of the screen structure. The pads effectively protect the installation space and shape of the reconstituted bamboo cavity, preventing it from being squeezed and deformed. The double sealing strips and column fixing structure ensure the overall stability of the screen, preventing component loosening and noise leakage, and ensuring stable sound absorption performance during long-term use.

[0058] In summary, this reconstituted bamboo sound barrier, when in use, is firmly fixed to the roadbed by the column 1 via the fixed base 4, fixed foot plate 6, and bolts 5. Its design, with the upper end tilted towards the road side, maximizes the reception of noise waves. The standard modular screen body is fixed between the columns 1 by clamping angle steel 3, and the gaps are sealed by the top column cover plate 2 to prevent rainwater erosion and noise diffraction. When noise is incident, the 0.3mm-1.0mm micro-perforations 15 arranged in an array on the reconstituted bamboo panel 7 and the internally sealed reconstituted bamboo cavity 16 form a resonant sound absorption system, converting mid-to-high frequency sound energy into vibration dissipation. The sealed air layer of the reconstituted bamboo cavity 16 simultaneously enhances the absorption of low-frequency noise. As the core... The reconstituted bamboo main screen 13 absorbs sound energy through its porous structure, and the diffusion texture 18 on its surface disperses and reflects sound waves, allowing sound energy to penetrate the sound-absorbing material more fully. The reinforcing frame 17 enhances the structural rigidity of the screen, and the pad 8 ensures the installation space and shape of the reconstituted bamboo cavity 16. The sealing strip 19 and sealing strip 2 10 achieve full circumferential sealing to prevent noise leakage. The waterproof and breathable membrane 11 keeps the reconstituted bamboo main screen 13 dry, and the reconstituted bamboo protective board 12 protects it. The weather-resistant coating on the outer surface of the reconstituted bamboo panel 7, the reconstituted bamboo main screen 13, and the reconstituted bamboo protective board 12 resists outdoor erosion. All components work together to achieve a highly efficient, stable, and long-lasting noise reduction effect.

[0059] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Moreover, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0060] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A reconstituted bamboo sound barrier, comprising posts (1), the upper ends of which are inclined toward the road side, characterized in that: The columns (1) are spaced apart, and a standard modular screen is installed between the columns (1). The standard modular screen includes a pad (8), a reconstituted bamboo cavity (16), a reinforcing frame (17), and a reconstituted bamboo main screen (13). A pad (8) is installed on one side of the reinforcing frame (17), and a reconstituted bamboo cavity (16) is installed in the middle of the pad (8). One side of the reconstituted bamboo cavity (16) is fixedly connected to the reinforcing frame (17). The reconstituted bamboo cavity (16) has a sealed air layer inside. The other side of the reinforcing frame (17) is installed with a reconstituted bamboo main screen (13). One side of the reconstituted bamboo main screen (13) is processed with a diffusion texture (18). Multiple clamping angle steels (3) are installed on the columns (1) from top to bottom. The clamping angle steels (3) can clamp and fix the standard modular screen. A column cover plate (2) is installed on the top of the standard modular screen between the columns (1).

2. The reconstituted bamboo sound barrier according to claim 1, characterized in that: The other side of the pad (8) is fitted with a reconstituted bamboo panel (7), and the reconstituted bamboo panel (7) is in contact with the reconstituted bamboo cavity (16). The other side surface of the reconstituted bamboo panel (7) is also provided with an array of micro-perforations (15).

3. The reconstituted bamboo sound barrier according to claim 1, characterized in that: The reconstituted bamboo main screen (13) has a waterproof and breathable membrane (11) installed on one side with a diffusion texture (18), and a reconstituted bamboo protective plate (12) installed on the other side of the waterproof and breathable membrane (11). One side of the reconstituted bamboo protective plate (12) abuts against the clamping angle steel (3), and the reconstituted bamboo protective plate (12) can prevent the waterproof and breathable membrane (11) from being exposed to the outside world.

4. The reconstituted bamboo sound barrier according to claim 2, characterized in that: The reinforcing frame (17) is recessed inward at both ends near the column (1), and a sealing strip (9) is installed at the recessed end. The standard modular screen body is equipped with a sealing strip (10) at the inclined corner along the column (1). The two sides of the sealing strip (9) abut against the reconstituted bamboo main screen body (13) and the pad (8) respectively. One side of the sealing strip (10) abuts against the reconstituted bamboo main screen body (13), and the other side passes through the pad (8) and abuts against the reconstituted bamboo panel (7).

5. The reconstituted bamboo sound barrier according to claim 2, characterized in that: The outer surfaces of the reconstituted bamboo panel (7) and the reconstituted bamboo main screen (13) are coated with a weather-resistant coating.

6. The reconstituted bamboo sound barrier according to claim 3, characterized in that: The outer surface of the reconstituted bamboo protective board (12) is coated with a weather-resistant coating.

7. The reconstituted bamboo sound barrier according to claim 2, characterized in that: The diameter of the micro-perforations (15) is 0.3mm-1.0mm, and the depth is the same as the thickness of the reconstituted bamboo panel (7).

8. The reconstituted bamboo sound barrier according to claim 1, characterized in that: Fixed foot plates (6) are installed on both sides of the lower end of the column (1), and a fixed base (4) is fixedly connected to the bottom of the column (1). The bottom of the fixed foot plate (6) is fixedly connected to the fixed base (4). A bolt (5) passes through the corner of the fixed base (4). The bolt (5) passes through the fixed base (4) and is fixedly connected to the roadbed on both sides of the road.

9. A method for manufacturing a reconstituted bamboo sound barrier, characterized in that, Includes the following steps: Step 1: The raw bamboo is broken into bundles, and then pretreated by drying and soaking in a composite agent for preservation, insect prevention and flame retardancy. Step 2: The pre-treated bamboo bundles are oriented and laid out into blanks, and then glued together in a hot press under high temperature and high pressure to form large-format reconstituted bamboo substrate boards. Step 3: Sand the substrate board to a fixed thickness, then dip or spray an outdoor weather-resistant resin coating and cure it; then, according to the acoustic design, perform CNC micro-perforation on the board as a reconstituted bamboo panel. Step 4: Cut the processed boards to the design dimensions and make the internal reinforcing frame; Step 5: In a special mold, place the reconstituted bamboo protective board, waterproof and breathable membrane, reconstituted bamboo main screen, reinforcing frame, padding block to ensure the thickness and protection of the cavity layer, reconstituted bamboo cavity, and reconstituted bamboo panel in sequence. Use environmentally friendly structural adhesive to bond them together and supplement them with mechanical connection to form a standard modular screen. Step 6: The finished modules are cured in a constant temperature and humidity environment, and then their appearance, dimensions, connection strength, and sampled acoustic performance are tested. Step 7: On the roadbed with the pre-embedded columns, first install sealing strip one and sealing strip two at both ends of the qualified standard modular screen body, then fix the standard modular screen body between the columns by clamping angle steel, and then install the column cover plate.

10. The method for manufacturing the reconstituted bamboo sound barrier according to claim 9, characterized in that: The drying process described in step 1 requires drying to a moisture content of 8%-12%, and the high temperature in the hot press described in step 2 is 140-160 degrees Celsius, and the high pressure is 5-8 MPa.

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