Nonmetal sound barrier unit plate

Abstract

The utility model discloses a nonmetal sound barrier unit plate which comprises a plurality of cement-based sound absorption panels arranged in parallel, a pouring inner mold is arranged on the back side face of each cement-based sound absorption panel, and a back cavity is defined by the pouring inner molds and the cement-based sound absorption panels. Concrete pouring structures are arranged on the periphery of each cement-based sound absorption panel and the pouring inner mold and the back side face of the pouring inner mold, the concrete pouring structures located on the back side face of the pouring inner mold form a back plate, and the concrete pouring structures located between the adjacent cement-based sound absorption panels and the pouring inner mold form joints. The concrete pouring structures located on the outermost peripheries of all the cement-based sound absorption panels and the pouring inner mold form side plates, and reinforcing steel bars are arranged in the side plates in the length direction and the height direction of the unit plates correspondingly. The nonmetal sound barrier unit plate has the advantages of being safe and reliable in structure and excellent in sound absorption and insulation performance and mechanical performance.

Description

Technical Field

[0001] The utility model belongs to the technical field of sound barriers, and in particular relates to a non-metallic sound barrier unit plate. Background Art

[0002] The sound barrier inserts a barrier between the noise source and the receiver to attenuate the propagation of sound waves, thereby achieving the purpose of noise reduction. Sound barriers include metal sound barriers and non-metal sound barriers. Among them, non-metal sound barriers have been rapidly developed due to their low cost and corrosion resistance.

[0003] The non-metallic sound barrier unit panels that are widely used at present have an extruded concrete structure as the shell, with holes on the side facing the sound source, and are filled with fiber-type sound-absorbing materials such as rock wool or glass wool. The production process of fiber-type sound-absorbing materials inside the non-metallic sound barrier unit panels used in the line belongs to the high-energy consumption industry, and the sound barrier assembly process is not good for the health of industrial personnel. Within 5 years, the panel is prone to cracking and damage, the sound-absorbing material collapses and powders, and collapses after being soaked in rainwater. The acoustic performance of the sound barrier cannot be guaranteed during the service life. The remaining small amount of integral prestressed concrete sound barriers used in railways place granular sound-absorbing materials on the side facing the sound source, and the backboard uses a prestressed reinforced concrete structure as a skeleton support. This type of non-metallic sound barrier has a complex construction process and a large surface density. Its low-frequency sound absorption performance is weak, the sound-absorbing material is connected to the concrete backboard at the construction site, and the overall structural stability of the unit panel is poor, making construction difficult. Therefore, it is necessary to study a non-metallic sound barrier unit panel with excellent acoustic performance, safe and reliable structure, and factory-manufactured. Utility Model Content

[0004] The utility model aims at the problems in the prior art and discloses a non-metallic sound barrier unit plate, which has the advantages of safe and reliable structure, excellent sound absorption and insulation performance and mechanical properties.

[0005] The utility model discloses a non-metallic sound barrier unit plate, comprising a plurality of cement-based sound-absorbing panels arranged in parallel, a casting inner mold being arranged on the back side of each cement-based sound-absorbing panel, and the casting inner mold and the cement-based sound-absorbing panel are enclosed to form a back cavity. Each cement-based sound-absorbing panel and the outer periphery of the casting inner mold, as well as the back side of the casting inner mold, are provided with a concrete casting structure, the concrete casting structure located on the back side of the casting inner mold constitutes a back plate, the concrete casting structure located between adjacent cement-based sound-absorbing panels and casting inner molds constitutes a joint, and the concrete casting structure located at the outermost periphery of all cement-based sound-absorbing panels and casting inner molds constitutes a side plate, and steel bars are arranged in the side plate along the length and height directions of the unit plate, respectively.

[0006] The cement-based sound-absorbing panel is externally arranged on the side facing the sound source, and the panel facing the sound source is designed to be a flat surface or a concave-convex surface, wherein the concave-convex surface is a continuous corrugated surface with a peak height of 5 to 15 mm.

[0007] The cement-based sound-absorbing panel is a prefabricated component, which is formed in one step by pouring or vibration pressing process, and has an isosceles trapezoidal cross section. After forming, it is naturally cured or steam cured according to the ambient temperature and humidity. After 7 to 28 days of curing, it reaches the product standard strength, that is, the compressive strength is above 2.5MPa and the flexural strength is above 1MPa. After demoulding, it forms a cement-based sound-absorbing material.

[0008] The cement-based sound-absorbing panel material is a mixture of lightweight aggregate, gel material and water, with a mixing mass ratio of 3 to 5:1:0.4 to 0.65. Each component fluctuates within the above proportion range depending on the application scenario, fixing method, design requirements and admixture addition of the unit board.

[0009] The lightweight aggregate has a particle size of 0.6 to 4.75 mm and is selected from at least one of ceramsite, volcanic rock particles and sandstone particles.

[0010] The cementitious material is a mixture of cement and admixture, wherein the cement mass accounts for 70% to 90%, the cement is selected from silicate cement or ordinary silicate cement with a strength grade of not less than 42.5, and the admixture includes at least one of silica fume, fly ash and fiber. The admixture can improve the mixing state of the slurry during the production process and enhance the flexural strength and freeze-thaw resistance of the formed board.

[0011] There are small-sized, continuous pore structures between particles inside the cement-based sound-absorbing panel sound-absorbing material, and the sound-absorbing material has a higher sound absorption coefficient within a wider frequency band.

[0012] The back cavity is an air sandwich formed by the cement-based sound-absorbing panel and the cast inner mold after being fixed. After the low-frequency noise enters the back cavity through the cement-based sound-absorbing panel, it causes the air in the back cavity to vibrate, converting the sound energy into heat energy; the back cavity and the cement-based sound-absorbing panel form a sound-absorbing structure, which is beneficial to improving the low-frequency sound absorption performance of the sound barrier unit board; the back cavity and the cement-based sound-absorbing panel and the backboard form a sound insulation structure, which is beneficial to improving the overall sound absorption and insulation performance of the sound barrier unit board.

[0013] The casting inner mold is selected from one of mass-produced fireproof PVC, polyurethane or prefabricated fiber cement board. The casting inner mold provides support. On the one hand, it can form a stable back cavity. On the other hand, it can provide sufficient support strength during concrete pouring to avoid structural collapse. At the same time, it also provides a casting surface for the backboard to ensure that the backboard is flatly formed. In addition, the casting inner mold material has a certain elasticity and can fully contact with the backboard and side panels, making the overall structure of the non-metallic sound barrier more stable.

[0014] The contact portion between the top of the inner mold and the cement-based sound-absorbing panel can be further flexibly connected with a rubber strip to ensure a flat wall surface and avoid leakage of concrete due to the uneven top surface of the inner mold and the bottom surface of the sound-absorbing panel during concrete pouring.

[0015] The inner mold pad is integrally formed with the casting inner mold and is arranged at the outer peripheral edge of the back outer side of the casting inner mold. The inner mold pad and the back outer side of the casting inner mold enclose a casting space for the back plate, ensuring that the back plate is formed in one step when pouring concrete. The back plate and the side plate are connected by point contact through the inner mold pad, which improves the elastic strain between the adjacent cement-based sound-absorbing panel + back cavity + back plate structure, improves the stability of the overall structure of the non-metallic sound barrier unit plate, and avoids the structure from breaking when it is sucked by the train.

[0016] Based on the structure of the above-mentioned non-metallic sound barrier unit panel, in order to further improve the comprehensive performance of the unit panel's high sound absorption and insulation performance, high structural strength and low surface density, this application further optimizes the thickness design of the cement-based sound-absorbing panel, back cavity, casting inner mold and back panel.

[0017] In some preferred solutions, the thickness of the cement-based sound-absorbing panel is 40 to 80 mm, more preferably 40 to 60 mm, and even more preferably 40 to 50 mm.

[0018] In some preferred solutions, the thickness of the back cavity is 40 to 80 mm, more preferably 40 to 70 mm, and even more preferably 40 to 60 mm.

[0019] In some preferred solutions, the thickness of the inner casting mold is 5-22 mm, preferably 5-20 mm, and even more preferably 10-20 mm.

[0020] In some preferred solutions, the thickness of the back plate is 12-20 mm, more preferably 12-18 mm, and even more preferably 14-18 mm.

[0021] Further adjustment of the thickness relationship between the cement-based sound-absorbing panel, the back cavity, the casting inner mold and the backboard is beneficial to improving the comprehensive performance of the unit board, including high sound absorption and insulation performance, high structural strength and low surface density.

[0022] In some preferred embodiments, the sum of the thickness of the cement-based sound-absorbing panel and the back cavity is 80 to 110 mm.

[0023] More preferably, the sum of the thickness of the cement-based sound-absorbing panel, the back cavity, the casting inner mold and the backboard is 115 to 145 mm.

[0024] The main prestressed steel bars are arranged along the length direction of the unit plate in the side plate, with a steel bar diameter of 7mm to 10mm and a single steel bar prestressing force of 35kN to 70kN. Appropriate prestressed steel bar diameter and prestress can improve the structural rigidity of the unit plate, ensure that when the overall structure of the sound barrier unit plate is subjected to wind pressure, no tensile stress area is generated, and prevent concrete from being damaged by tension.

[0025] In some preferred solutions, more than two main prestressed steel bars are arranged at the upper and lower ends of the side panels.

[0026] As a further preference, 2 to 3 main prestressed steel bars are arranged at each of the upper and lower ends of the side plate.

[0027] The side panels are provided with end reinforcement steel bars along the height direction of the unit panels, with a diameter of 5 mm to 8 mm. The end reinforcement steel bars can enhance the tensile properties of the concrete at the left and right ends of the sound barrier unit panels, preventing the tension applied by the prestressed steel bars from cracking the end concrete.

[0028] In some preferred solutions, at least two end reinforcing steel bars are arranged at the left and right ends of the side plate.

[0029] As a further preference, 2 to 3 end reinforcing steel bars are arranged at each of the left and right ends of the side plate.

[0030] The back plate, the seams between the sound-absorbing panels, the seams between the inner moulds and the side plates are cast in one go by using the external mould concrete, and are tightly connected and have good structural stability.

[0031] The concrete is selected from a mixture of aggregate, cementitious material and water, and the mixing mass ratio is 1.5-3.5:1:0.3-0.35. Each component fluctuates within the above proportion range depending on the application scenario of the unit board, the fixing method, the design requirements and the addition of admixtures.

[0032] The aggregate is selected from a mixture of fine stone and sand, the ratio of which can be adjusted according to the fluidity of the slurry, and the particle size of the fine stone is less than 10 mm.

[0033] The aggregate may also be selected from pure mortar.

[0034] The cementitious material is selected from a mixture of cement and admixtures, wherein cement accounts for 60% to 70%, the cement is selected from silicate or ordinary silicate cement with a strength grade of not less than 42.5, and the admixture is selected from silica fume or fly ash. The admixture can improve the fluidity of the slurry during the production process, facilitate the molding of small-sized components such as backboards, and eliminate bubbles generated during the cement hydration reaction, ensuring that the concrete after molding is uniform and flat.

[0035] The concrete can also be selected from pure mortar, and 0.1% of fiber is added to enhance the compressive and flexural strength of the concrete.

[0036] Preferably, among the joints between the inner molds, the second joints between the two outermost inner molds have a wider joint size than the first joints between the inner molds in the middle position, so as to provide a better force-bearing fixing position for the unit board transportation and installation fixture. The joints between the inner molds are formed by concrete pouring, and the joint size can be adjusted by adjusting the relative size between the poured inner mold and the cement-based sound-absorbing panel.

[0037] The joint between the cement-based sound-absorbing panel and the side panel is inclined at an angle of 5 to 20 degrees to the horizontal direction, which can ensure that the sound barrier unit panel cannot fall out when subjected to the suction force of the train.

[0038] The characteristics and beneficial effects of the utility model are:

[0039] (1) The light aggregate cement-based sound-absorbing board is used as the sound-absorbing material to ensure the mid- and high-frequency sound absorption performance of the entire unit panel. The back cavity reduces the overall weight of the unit panel while improving the low-frequency sound absorption performance of the entire unit panel. The structure of acoustic impedance change formed by the cement-based sound-absorbing panel + back cavity + back panel ensures the sound absorption and insulation performance of the entire unit panel. The overall structure of the unit panel is cast in one go with simple process and high production efficiency. All components are connected by wet concrete, and the structure has good integrity. The concrete frame firmly bites the sound-absorbing panel to prevent the sound-absorbing panel from falling out when the structure is sucked by the train. The inner mold plays a supporting role and provides a casting surface for the back panel to ensure Ensure that the back panel is smoothly formed. In addition, the casting inner mold material has a certain elasticity and can fully contact with the back panel and side panels, making the overall structure of the non-metallic sound barrier more stable; the point contact between the back panel and the side panels can increase the elastic strain between the adjacent cement-based sound-absorbing panel + back cavity + back panel structure, and improve the stability of the overall structure of the non-metallic sound barrier; steel bars are arranged in the length and height directions of the unit panel to avoid local tensile stress areas when the unit panel is subjected to vehicle-induced wind pressure or natural wind pressure, avoid the generation of local cracks, and improve the overall mechanical properties of the unit panel; after the unit panel is formed, the appearance is flat and uniform, which is conducive to improving the landscape effects along railways, urban rail transit, highways, etc.

[0040] (2) Based on the unit panel structure, the present application further optimizes the thickness of the cement-based sound-absorbing panel, the thickness of the back cavity, the thickness of the casting inner mold and the thickness of the back panel, and further optimizes the sum of the thicknesses of the four, thereby further improving the comprehensive performance of the unit panel in terms of high sound absorption and insulation performance, high structural stiffness and low surface density.

[0041] (3) Based on the unit plate structure, the present application further optimizes the diameter of the main prestressed steel bars and the prestressing force, thereby further improving the structural stiffness and stability of the unit plate.

[0042] The utility model uses a structure of acoustic impedance variation formed by cement-based sound-absorbing panels + back cavities + back panels to ensure that the unit panels have excellent sound absorption performance, and uses the casting inner mold and the point contact structure between the back panel and the side panels to jointly improve the mechanical properties and elastic strain of the material. On this basis, the stability of the unit panels is improved by one-time casting of concrete and side panel reinforcement. At the same time, the size of the unit panels and the diameter and prestressed tension of the main prestressed reinforcement are further optimized on the basis of the unit panel structure. Therefore, the utility model uses the overall structural design to make the non-metallic sound barrier unit panels meet the requirements of sound absorption and insulation performance while having stable structure, excellent mechanical properties, and wind pressure resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the drawings required for use in the embodiments are briefly introduced below.

[0044] Figure 1 This is a vertical view of the non-metallic sound barrier unit panel of the utility model.

[0045] Figure 2 yes Figure 1 AA section view.

[0046] Figure 3 yes Figure 1 BB cross-sectional view.

[0047] Figure 4 yes Figure 1 CC cross-sectional view.

[0048] Figure 5 yes Figure 1 DD cross-sectional view.

[0049] Figure 6 a and b are actual pictures of the non-metallic sound barrier unit panels of Example 2 and Example 9 respectively.

[0050] The reference numerals in the specific implementation manner are as follows:

[0051] 1. Cement-based sound-absorbing panel; 2. Back cavity; 3. Casting inner mold; 3-1. Inner mold pad; 4. Back panel; 5. Joints between sound-absorbing panels; 6. Joints between inner molds; 6-1. First joint between inner molds; 6-2. Second joint between inner molds; 7. End reinforcement steel bars; 8. Main prestressed steel bars; 9. Fitting joints; 10. Side panels. DETAILED DESCRIPTION

[0052] The embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. The same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limiting the present application.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0054] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this patent and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0055] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "setting" should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0056] In the description of this application, the terms "first" and "second" are only used to distinguish different objects and should not be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary and secondary relationship of the indicated technical features.

[0057] See also Figure 1-5 The non-metallic sound barrier unit plate of the utility model comprises a plurality of cement-based sound-absorbing panels 1 arranged in parallel, and a casting inner mold 3 is arranged on the back side of each cement-based sound-absorbing panel 1, and the casting inner mold 3 and the cement-based sound-absorbing panel 1 are enclosed to form a back cavity (such as Figure 2 , 4). Each cement-based sound-absorbing panel 1 and the outer periphery of the casting inner mold 3, as well as the back side of the casting inner mold 3, have a concrete casting structure. The concrete casting structure located on the back side of the casting inner mold 3 constitutes a back plate 4, the concrete casting structure located between adjacent cement-based sound-absorbing panels 1 constitutes a joint 5 between the sound-absorbing panels, the concrete casting structure located between adjacent casting inner molds 3 constitutes a joint 6 between the inner molds, and the concrete casting structure located at the outermost periphery of all cement-based sound-absorbing panels 1 and the casting inner mold 3 constitutes a side plate 10, and the side plate 10 is provided with main prestressed steel bars 8 along the length direction of the unit plate, and end reinforcement steel bars 7 along the height direction (such as Figure 3 , 4 , 5).

[0058] Example 1

[0059] S1: The cement-based sound-absorbing panel 1, the inner casting mold 3, the end reinforcing steel bars 7, and the main prestressed steel bars 8 are fixed according to the designed position by auxiliary tools such as an external mold positioning device, a locking device, and a tensioning pedestal.

[0060] S2: The main prestressed steel bars 8 are arranged along the length direction of the sound barrier unit plate, with 2 bars arranged at each end. Before pouring concrete, the main prestressed steel bars 8 are anchored on the pedestal or external steel mold, and the four main prestressed steel bars 8 are simultaneously applied with tension, and the tension is increased synchronously during the process; the end reinforcement steel bars 7 are arranged along the height direction of the sound barrier unit plate, with 2 bars arranged at each end. After the main prestressed steel bars 8 are applied with tension, they are overlapped with the main prestressed steel bars 8.

[0061] S3: After the concrete is mixed, it is cast into shape through an external mold at one time. After vibrating, it is left to stand for a period of time, cured at a constant temperature of 40°C, and cooled naturally. When the main concrete is poured, the remaining material is used to prepare the compressive strength standard test piece, and it is cured under the same conditions as the sound barrier unit board. When the strength of the standard test piece reaches 75% of the concrete design strength, the main prestressed steel bar 8 is relaxed, and the material is demoulded and naturally cured to the concrete age to obtain the non-metallic sound barrier unit board.

[0062] The cement-based sound-absorbing panel 1 is made of ceramsite, cement, fly ash and water in a mass ratio of 3.7:0.8:0.2:0.45, with a thickness of 40 mm, wherein the particle size of the ceramsite is 2.25 mm, the thickness of the back cavity 2 is 40 mm, the casting inner mold 3 is a fireproof PVC material with a thickness of 20 mm, the inner mold pad 3-1 is integrally formed with the casting inner mold 3, and is arranged at the outer peripheral edge of the back outer side of the casting inner mold 3, the back plate 4, the joint 5 between the sound-absorbing panel and the inner mold The first joint 6-1 between the tools, the second joint 6-2 between the inner molds, and the fitting joint 9 between the cement-based sound-absorbing panel 1 and the side panel 10 are made of concrete with a mass ratio of 0.3:2:1:0.33, with a thickness of 14 mm. The fitting joint 9 between the cement-based sound-absorbing panel 1 and the side panel 10 is inclined at an angle of 12° to the horizontal direction. The prestressed steel bar 8 has a diameter of 10 mm, a single steel bar prestressing tension of 45 kN, and an end reinforcement steel bar 7 has a diameter of 8 mm.

[0063] Example 2

[0064] The difference from Example 1 is that the cement-based sound-absorbing panel is 50 mm thick and the back cavity is 56 mm thick.

[0065] Example 3

[0066] The difference from Example 1 is that the thickness of the cement-based sound-absorbing panel is 70 mm, and the thickness of the back cavity is 70 mm.

[0067] Example 4

[0068] The difference from Example 1 is that the cement-based sound-absorbing panel is 30 mm thick and the back cavity is 36 mm thick.

[0069] Example 5

[0070] The difference from Example 1 is that the cement-based sound-absorbing panel is 30 mm thick and the back cavity is 56 mm thick.

[0071] Example 6

[0072] The difference from Example 1 is that the cement-based sound-absorbing panel is 90 mm thick and the back cavity is 56 mm thick.

[0073] Example 7

[0074] The difference from Example 1 is that the cement-based sound-absorbing panel is 90 mm thick and the back cavity is 86 mm thick.

[0075] Example 8

[0076] The difference from Example 1 is that the cement-based sound-absorbing panel is 50 mm thick, the back cavity is 56 mm thick, the diameter of the prestressed steel bar is 8 mm, and the prestressed tension of a single steel bar is 30 kN.

[0077] Example 9

[0078] The difference from Example 1 is that the cement-based sound-absorbing panel is 50 mm thick, the back cavity is 56 mm thick, the diameter of the prestressed steel bar is 13 mm, and the prestressed tension of a single steel bar is 80 kN.

[0079] The non-metallic sound barrier unit panels of each embodiment are subjected to performance tests, including:

[0080] (1) Comprehensive acoustic performance test

[0081] ① Sound absorption performance: The test method, test equipment and sample preparation of the low-frequency sound absorption coefficient and noise reduction coefficient of the sound barrier unit panel shall comply with the relevant provisions of "Sound Absorption Measurement in Acoustic Reverberation Chamber" (GB / T 20247).

[0082] ② Sound insulation performance: The weighted sound insulation test method, test equipment and sample preparation of the sound barrier unit panel are in compliance with the relevant provisions of "Sound Insulation Measurement of Acoustic Buildings and Building Components Part 3: Laboratory Measurement of Airborne Sound Insulation of Building Components" (GB / T19889.3).

[0083] (2) Maximum elastic deflection and maximum residual deformation: The test method and test equipment for the maximum elastic deflection and maximum residual deformation of the sound barrier unit panel comply with the relevant provisions of "Test Methods for Airtightness, Watertightness and Wind Pressure Resistance of Building Curtain Walls" (GB / T 15227). The installation and stress conditions of the unit panel are consistent with those when installed on both sides of the line, and the load is 5KPa.

[0084] (3) Surface density test: Use a measuring tool with an accuracy of not less than 1mm to measure the length l and height h of the unit board. Measure at least three locations on each sample and take the average value as the test result. Use a platform scale with an accuracy of not less than 0.1kg or a measuring tool with the same accuracy to measure the weight m of the unit board. Surface density = m / (l×h).

[0085] The performance test results of each embodiment are shown in Table 1.

[0086] Table 1

[0087]

[0088] It can be seen from Examples 1-9 that the structure of the unit panel of the present application can achieve the comprehensive performance of high sound absorption and insulation performance, high structural strength and low surface density. At the same time, Examples 1-9 show certain differences in performance indicators under the designs of different cement-based sound-absorbing panel thicknesses, back cavity thicknesses, main prestressed steel bar diameters and prestressed tension. Therefore, the present application further discusses some correlations in the unit panel parameter optimization design through the designs of Examples 1-9.

[0089] While the differences in sound absorption and insulation performance of Examples 1-7 are not large, there are some obvious differences in structural stiffness and surface density. We can find that there is a certain optimization correlation between the thickness of the cement-based sound-absorbing panel, the thickness of the back cavity, the thickness of the casting inner mold and the thickness of the backboard, and the selection of the optimization range leads to differences in performance indicators. Therefore, we preliminarily optimized the ranges of the above thicknesses, and selected the thickness of the cement-based sound-absorbing panel to be 40-80 mm, the thickness of the back cavity to be 40-80 mm, the thickness of the casting inner mold to be 5-22 mm, and the thickness of the backboard to be 12-20 mm.

[0090] In order to verify the effectiveness of the above-mentioned preferred range, we changed the thickness of the cement-based sound-absorbing panel and the back cavity on the basis of fixing the thickness of the casting inner mold and the thickness of the back plate. We found that in Examples 1-7, within the above-mentioned optimized thickness range, the unit board has better comprehensive performance in terms of sound absorption and insulation performance, structural stiffness and surface density. By comparing Examples 1-3 with Examples 4-5, it can be found that when the thickness of the cement-based sound-absorbing panel is low, the maximum elastic deflection and the maximum residual deformation are basically doubled, which greatly reduces the structural stiffness of the unit board. By comparing Examples 1-3 with Examples 6-7, it can be found that when the thickness of the cement-based sound-absorbing panel is high, the surface density of the unit board is too large, which does not meet the requirements of lightweight design, and the wind pressure resistance will also be reduced, which is not conducive to the transportation and construction and installation of subsequent products. Therefore, by comparing Examples 1-3 with Examples 4-7, the preferred nature of the cement-based sound-absorbing panel, back cavity, casting inner mold and back plate thickness range of this application can be verified.

[0091] At the same time, through Examples 1-3, it can be found that the thickness of the cement-based sound-absorbing panel and the thickness of the back cavity are more closely related, so the sum of the thicknesses of the two is optimized to 80-110 mm. Through Examples 1-3, it is found that when the sum of the thickness of the cement-based sound-absorbing panel and the back cavity is lower, the comprehensive performance of the unit board in terms of high noise reduction performance, high structural strength and low surface density is better. Therefore, by comparing Examples 1-2 with Example 3, the preferred range of the sum of the thickness of the cement-based sound-absorbing panel and the back cavity of the present application can be verified.

[0092] While the sound absorption and insulation performance and surface density of Examples 1-3 and 8-9 are not much different, the structural stiffness shows a relatively obvious difference. We can find that the optimization correlation between the diameter of the main prestressed steel bars and the prestressed tension will lead to differences in the performance of the unit plate. Therefore, we optimize the diameter of the main prestressed steel bars to 7mm~10mm, and the prestressed tension of a single steel bar to 35kN~70kN. By comparing Examples 1-3 and Example 8, it can be found that when the diameter of the main prestressed steel bars and the prestressed tension are too small, the maximum elastic deflection and maximum residual deformation of the unit plate are significantly increased, which is not conducive to the stability of the unit plate. By comparing Examples 1-3 and Example 9, it can be found that when increasing the tension of the main prestressed steel bars, the diameter of the steel bars needs to be increased at the same time, which results in a decrease in the thickness of the protective layer of the reinforcing steel bars at the end of the unit plate. At the same time, the increase in the load of the main prestressed steel bars increases the bending moment of the side plate concrete, which will reduce the stability of the unit plate to a certain extent. Under normal loads, the unit plates of Examples 1-9 can maintain good stability, but under extreme loads of 5KPa, the unit plates of Example 9 show a certain degree of cracking ( Figure 6 b), while the unit board of Example 2 still has good stability ( Figure 6 a). Therefore, the preferred nature of the prestressed steel bar diameter and prestressing tension range of the present application can be verified through Examples 2 and 8-9.

[0093] The above embodiments are only used to illustrate the technical solutions of the present application and are not used to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A non-metallic sound barrier unit plate, characterized in that: It comprises a plurality of cement-based sound-absorbing panels (1) arranged in parallel, wherein a casting inner mold (3) is arranged on the back side of each cement-based sound-absorbing panel (1), and the casting inner mold (3) and the cement-based sound-absorbing panel (1) are combined to form a back cavity (2); Each of the cement-based sound-absorbing panels (1) and the casting inner mold (3) has a concrete casting structure on its outer periphery and on the back side of the casting inner mold (3); the concrete casting structure on the back side of the casting inner mold (3) constitutes a back plate (4); the concrete casting structure between adjacent cement-based sound-absorbing panels (1) and casting inner molds (3) constitutes a joint; the concrete casting structure on the outermost periphery of all the cement-based sound-absorbing panels (1) and casting inner molds (3) constitutes a side plate (10); and steel bars are arranged in the side plate (10) along the length and height directions of the unit plate.

2. The non-metallic sound barrier unit plate according to claim 1, characterized in that: The cement-based sound-absorbing panel (1) is externally arranged on the side facing the sound source, and the panel on the side facing the sound source is designed to be a flat surface or a concave-convex surface, wherein the concave-convex surface is a continuous corrugated surface with a peak height of 5 to 15 mm.

3. The non-metallic sound barrier unit plate according to claim 1, characterized in that: The contact portion between the top of the inner casting mold (3) and the cement-based sound-absorbing panel (1) can be further flexibly connected by a rubber strip; An inner mold pad (3-1) is arranged at the outer peripheral edge of the back outer side surface of the casting inner mold (3) and is integrally formed with the casting inner mold (3). The inner mold pad (3-1) and the back outer side surface of the casting inner mold (3) enclose a casting space for the back plate (4).

4. The non-metallic sound barrier unit plate according to claim 1, characterized in that: The thickness of the cement-based sound-absorbing panel (1) is 40 to 80 mm.

5. The non-metallic sound barrier unit plate according to claim 1, characterized in that: The back cavity (2) has a thickness of 40 to 80 mm.

6. The non-metallic sound barrier unit plate according to claim 1, characterized in that: The back cavity (2) has a thickness of 40 to 70 mm.

7. The non-metallic sound barrier unit plate according to claim 1, characterized in that: The back cavity (2) has a thickness of 40 to 60 mm.

8. The non-metallic sound barrier unit plate according to claim 1, characterized in that: The thickness of the casting inner mold (3) is 5-22 mm.

9. The non-metallic sound barrier unit plate according to claim 1, characterized in that: The thickness of the inner casting mold (3) is 5 to 20 mm.

10. The non-metallic sound barrier unit plate according to claim 1, characterized in that: The thickness of the inner casting mold (3) is 10 to 20 mm.

11. The non-metallic sound barrier unit plate according to claim 1, characterized in that: The back plate (4) has a thickness of 12-20 mm.

12. The non-metallic sound barrier unit plate according to claim 1, characterized in that: The back plate (4) has a thickness of 12 to 18 mm.

13. The non-metallic sound barrier unit plate according to claim 1, characterized in that: The back plate (4) has a thickness of 14 to 18 mm.

14. The non-metallic sound barrier unit plate according to claim 1, characterized in that: The sum of the thicknesses of the cement-based sound-absorbing panel (1) and the back cavity (2) is 80 to 110 mm.

15. The non-metallic sound barrier unit plate according to claim 1, characterized in that: The total thickness of the cement-based sound-absorbing panel (1), the back cavity (2), the casting inner mold (3) and the backboard (4) is 115 to 145 mm.

16. The non-metallic sound barrier unit plate according to claim 1, characterized in that: Main prestressed steel bars (8) are arranged inside the side plate (10) along the length direction of the unit plate, and more than two of the main prestressed steel bars (8) are arranged at each of the upper and lower ends of the side plate (10).

17. The non-metallic sound barrier unit plate according to claim 16, characterized in that: The main body prestressed steel bars (8) are arranged 2 to 3 at each of the upper and lower ends of the side plate (10); End reinforcement steel bars (7) are arranged inside the side plate (10) along the height direction of the unit plate, and more than two end reinforcement steel bars (7) are arranged at each of the left and right ends of the side plate (10).

18. The non-metallic sound barrier unit plate according to claim 17, characterized in that: The end reinforcement steel bars (7) are arranged in 2 to 3 pieces at the left and right ends of the side plate (10).

19. The non-metallic sound barrier unit panel according to claim 1, characterized in that: The joint comprises a concrete casting structure located between adjacent cement-based sound-absorbing panels (1) constituting a joint between sound-absorbing panels (5), and a concrete casting structure located between adjacent casting inner molds (3) constituting a joint between inner molds (6); The back plate (4), the seam between the sound-absorbing panels (5), the seam between the inner molds (6), and the side plates (10) are cast in one go by using the external mold concrete; The joint seam (9) between the cement-based sound-absorbing panel (1) and the side panel (10) has an inclination angle of 5 to 20 degrees with respect to the horizontal direction.

Images