Sound insulation composite fiber cement board
By using a 'sandwich' structure and gradient density porous sound-absorbing material, the sound-insulating composite fiber cement board solves the problem of insufficient low-frequency noise insulation in traditional fiber cement boards, achieving efficient broadband sound insulation and structural stability, and is easy to construct.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ANHUI LIAO NEW MATERIAL TECH CO LTD
- Filing Date
- 2025-07-01
- Publication Date
- 2026-05-19
AI Technical Summary
Traditional fiber cement boards have limitations in sound insulation performance, especially in the poor sound insulation of low and medium frequency noise. Existing methods, such as increasing thickness or adding sound insulation materials, have problems such as complicated construction, increased weight, and high cost. Composite boards have insufficient strength or poor weather resistance, and have not effectively solved the problems of bonding strength and sound bridging between different materials.
The sound-insulating composite fiber cement board with a 'sandwich' structure includes first and second fiber cement layers and an intermediate gradient density porous sound-absorbing damping layer. Combined with through-through reinforcing connectors, the gradient density design and concave-convex interlocking structure improve the interlayer bonding strength and anti-delamination properties, while the intermediate layer absorbs mid-to-low frequency sound waves.
It achieves broadband sound insulation, improves the bending resistance, impact resistance and delamination resistance of the panels, ensures structural stability, and is easy to construct with strong overall integrity.
Smart Images
Figure CN224259644U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of building materials technology, specifically to a sound-insulating composite fiber cement board. Background Technology
[0002] With the acceleration of urbanization and the increasing demands for comfort in living and working environments, building sound insulation has become a growing concern. Fiber cement boards, due to their advantages such as fire resistance, moisture resistance, and high strength, are widely used in interior and exterior walls. However, traditional single-material fiber cement boards have limitations in sound insulation performance; their sound insulation, especially for low- and mid-frequency noise, often fails to meet high-standard sound insulation requirements, such as in residential partition walls, recording studios, and hospital wards.
[0003] In existing technologies, the following methods are commonly used to improve sound insulation performance:
[0004] Increasing the thickness of the sheet material has limited effect and increases weight and cost.
[0005] Additional sound insulation material layers: such as adding sound-absorbing layers like rock wool or glass wool behind fiber cement boards, or filling the cavities of the keel with sound insulation cotton. This method is complex to construct, occupies a large space, has poor overall integrity, and may have a "sound bridge" effect due to loose connections, affecting the final sound insulation effect.
[0006] Composite panels are used: Some composite sound insulation panels already exist, such as gypsum board composite rock wool and calcium silicate board composite sound insulation layer. However, these composite panels either lack sufficient strength, have poor weather resistance and fire resistance, or fail to effectively address the bonding strength between different materials, sound bridging issues, and broadband sound insulation requirements in their composite structure design.
[0007] Therefore, there is an urgent need to develop an integrated composite fiber cement board that combines high strength, excellent sound insulation performance (especially broadband sound insulation), convenient construction, and structural stability. Utility Model Content
[0008] To address the shortcomings of existing technologies, this utility model provides a sound-insulating composite fiber cement board, which features a novel structure, excellent sound insulation performance, strong integrity, and convenient construction.
[0009] To solve the above-mentioned technical problems, this utility model provides the following technical solution:
[0010] A sound-insulating composite fiber cement board includes a first fiber cement layer, an intermediate sound-insulating damping layer tightly bonded to the inner surface of the first fiber cement layer, and a second fiber cement layer tightly bonded to the other side of the intermediate sound-insulating damping layer; the intermediate sound-insulating damping layer is composed of a gradient density porous sound-absorbing material, and the density at the center of the intermediate sound-insulating damping layer is greater than the density on both sides; a plurality of reinforcing connectors with barbs are provided through the cement board in the thickness direction.
[0011] Preferably, the gradient density porous sound-absorbing material is made of rock wool strips or glass wool strips with varying density, tightly spliced together.
[0012] In the above technical solution, when sound waves enter the sound-absorbing material (high impedance) from the air (low impedance), they are strongly reflected at the interface. Low-frequency sound waves have wavelengths of 1-20 meters and strong penetrating power, but the acoustic impedance of traditional uniform porous materials, such as rock wool with constant density, is usually much higher than that of air. This causes a large number of low-frequency sound waves to be reflected on the surface of the material and unable to penetrate into the interior for absorption.
[0013] The core function of the intermediate sound-damping layer is to efficiently absorb and attenuate sound wave energy, especially mid-to-low frequency sound waves. The surface layer has a low density and high porosity, and its acoustic impedance is close to that of air, significantly reducing interface reflection and allowing more low-frequency sound waves, especially long waves, to penetrate smoothly into the material. The middle layer has a high density, and as the depth increases, the material density gradually increases, the porosity decreases, and the acoustic impedance increases gradually, avoiding internal reflections caused by abrupt impedance changes.
[0014] Preferably, the reinforcing connector includes a connecting rib, with a first cavity and a second cavity at both ends. The end face of the first cavity communicates with the outside. A screw is threaded into the first cavity, with a nut connected to the outer end of the screw and a conical extrusion block connected to the inner end of the screw. The nut is located in the first cavity, and the extrusion block is located in the second cavity. The side wall of the connecting rib has multiple through holes communicating with the second cavity. A limit block is slidably disposed in the second cavity. The outer wall of the limit block is conical, and the inner wall has a bevel. The extrusion block is located at the center of the circumference formed by all the limit blocks. The inclination angle of the conical surface of the extrusion block is smaller than the inclination angle of the bevel of the inner wall of the limit block. A central rod is connected to the center of the top wall of the second cavity. Multiple springs matching the limit blocks are connected to the central rod, and the springs are connected to the corresponding limit blocks.
[0015] In the above technical solution, after the wet blanks of the first fiber cement layer and the second fiber cement layer are prepared, the wet blanks of the first fiber cement layer, the prefabricated part of the middle sound insulation damping layer, and the wet blank of the second fiber cement layer are stacked in sequence. Then, the connecting ribs are inserted into the three according to the design position. Then, the nuts are tightened with the help of tools. The nuts drive the screw to rotate. Since the screw is threadedly connected to the first cavity, the screw will push the extrusion block to move inward. The extrusion block will push the limiting block to move outward through its conical surface, thereby forming a chamfered structure to fix the first fiber cement layer, the middle sound insulation damping layer, and the second fiber cement layer.
[0016] Preferably, the upper and lower walls of the through hole are provided with sliding grooves, and the upper and lower ends of the limiting block are connected to sliders, which are slidably connected in the corresponding sliding grooves.
[0017] In the above technical solution, when the extrusion block pushes the limiting block to move, the limiting block is slidably connected to the slide groove through the slider, which can improve the stability of the limiting block's movement.
[0018] Preferably, the height of the limiting block is less than the height of the through hole.
[0019] In the above technical solution, when the limiting block expands and presses tightly into the through hole, it becomes difficult to push the limiting block. However, if the height of the limiting block is less than the height of the through hole, that is, when the slider at the lower end of the limiting block is completely located in the groove of the bottom wall of the through hole, there is a gap between the top of the limiting block and the top wall of the through hole, and between the slider at the upper end of the limiting block and the groove of the top wall of the through hole. This prevents the limiting block from being pressed tightly into the through hole due to expansion, thereby facilitating the pushing of the limiting block.
[0020] Preferably, a matching concave-convex interlocking structure is provided between the inner surfaces of the first fiber cement layer and the second fiber cement layer and the corresponding contact surfaces of the intermediate sound insulation damping layer; the concave-convex interlocking structure is wavy.
[0021] The above technical solution designs an interlocking concave-convex interlocking structure between the two fiber cement layers and the intermediate sound insulation damping layer, which improves the interlayer bonding strength, shear resistance and anti-delamination, while optimizing the acoustic interface and reducing sound bridges.
[0022] Compared with the prior art, the present invention has the following beneficial effects:
[0023] (1) The “sandwich” structure, combined with a gradient density and a specific pore structure, forms an intermediate sound-damping layer that effectively blocks and absorbs noise over a wide frequency range, especially the difficult-to-handle mid-to-low frequency noise.
[0024] (2) The first and second fiber cement layers provide the main load-bearing structure. The three layers are tightly bonded into a whole by the through reinforcing connectors and their barbs, which greatly improves the bending resistance, impact resistance and delamination resistance of the board and ensures the structural stability for long-term use. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of the present invention;
[0026] Figure 2 A schematic diagram to reinforce the connector;
[0027] Figure 3 for Figure 1 Enlarged view of point A;
[0028] Figure 4 for Figure 3 A schematic diagram of the middle limit block after it has slid out;
[0029] In the figure: 1-First fiber cement layer, 2-Intermediate sound insulation damping layer, 3-Second fiber cement layer, 4-Reinforcing connector, 401-Connecting rib, 402-First cavity, 403-Second cavity, 404-Screw, 405-Nut, 406-Extrusion block, 407-Through hole, 408-Limiting block, 409-Center rod, 410-Spring, 411-Slide groove, 412-Slider, 5-Concave-convex interlocking structure. Detailed Implementation
[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0031] Please see Figures 1-4 A sound-insulating composite fiber cement board includes a first fiber cement layer 1, an intermediate sound-insulating damping layer 2 tightly bonded to the inner surface of the first fiber cement layer 1, and a second fiber cement layer 3 tightly bonded to the other side of the intermediate sound-insulating damping layer 2. The first fiber cement layer 1 and the second fiber cement layer 3 have identical structures, made of cement, reinforcing fibers (such as cellulose fibers, PVA fibers, glass fibers, carbon fibers, or combinations thereof), fillers, and additives, providing the main structural strength and surface hardness.
[0032] The intermediate sound-damping layer 2 is composed of a gradient-density porous sound-absorbing material, which is made of tightly spliced rock wool or glass wool strips with varying density gradients. The density at the center of the intermediate sound-damping layer 2 is greater than that on its sides. The core function of the intermediate sound-damping layer 2 is to efficiently absorb and attenuate sound wave energy, especially mid-to-low frequency sound waves. The surface layers on both sides of the intermediate sound-damping layer 2 have low density and high porosity, and their acoustic impedance is close to that of air, significantly reducing interface reflection and allowing more low-frequency sound waves, especially long waves, to penetrate smoothly into the material. The middle layer has a high density, and as the depth increases, the material density gradually increases, the porosity decreases, and the acoustic impedance increases gradually, avoiding internal reflection caused by abrupt impedance changes.
[0033] Several barbed reinforcing connectors 4 are provided through the cement slab in the thickness direction. The reinforcing connectors 4 can be made of steel bars or carbon fiber, etc. Each reinforcing connector 4 includes a connecting rib 401, with a first cavity 402 and a second cavity 403 at both ends. The end face of the first cavity 402 communicates with the outside. A screw 404 is threaded into the first cavity 402, a nut 405 is connected to the outer end of the screw 404, and a conical extrusion block 406 is connected to the inner end of the screw 404. The nut 405 is located inside the first cavity 402, and the extrusion block 406 is located inside the second cavity 403. The sidewall of the connecting rib 401 has multiple connections to the second cavity. The through hole 407 is provided. A limiting block 408 is slidably disposed in the second cavity 403. The outer wall of the limiting block 408 is cone-shaped and the inner wall is provided with a bevel. The extrusion block 406 is located at the center of the circumference formed by all the limiting blocks 408. The inclination angle of the cone surface of the extrusion block 406 is less than the inclination angle of the bevel of the inner wall of the limiting block 408. A central rod 409 is connected to the center of the top wall of the second cavity 403. Multiple springs 410 matching the limiting blocks are connected to the central rod 409. The springs 410 are connected to the corresponding limiting blocks 408. After the wet blanks of the first fiber cement layer 1 and the second fiber cement layer 3 are prepared, the wet blanks of the first fiber cement layer 1, the prefabricated part of the intermediate sound insulation damping layer 2, and the wet blank of the second fiber cement layer 3 are stacked in sequence. Then, the connecting ribs 401 are inserted into the three according to the design position. Then, the nut 405 is tightened with the help of a tool. The nut 405 drives the screw 404 to rotate. Since the screw 404 is threadedly connected to the first cavity 402, the screw 404 will push the extrusion block 406 to move inward. The extrusion block 406 pushes the limiting block 408 to move outward through its conical surface, thereby forming a chamfered structure to fix the first fiber cement layer 1, the intermediate sound insulation damping layer 2, and the second fiber cement layer 3.
[0034] The upper and lower walls of the through hole 407 are provided with grooves 411, and the upper and lower ends of the limiting block 408 are connected to sliders 412, which are slidably connected within the corresponding grooves 411. When the pressing block 406 pushes the limiting block 408 to move, the limiting block 408 is slidably connected within the grooves 411 via the sliders 412, which can improve the stability of the movement of the limiting block 408.
[0035] The height of the limiting block 408 is less than the height of the through hole 407. When the limiting block expands and presses tightly into the through hole, it becomes difficult to push the limiting block. However, since the height of the limiting block 408 is less than the height of the through hole 407, when the slider 412 at the lower end of the limiting block 408 is completely located in the groove 411 on the bottom wall of the through hole 407, there is a gap between the top of the limiting block 408 and the top wall of the through hole 407, and between the slider at the upper end of the limiting block 408 and the groove on the top wall of the through hole 407. This prevents the limiting block 408 from being pressed tightly into the through hole 407 due to expansion, thereby facilitating the pushing of the limiting block 408.
[0036] A matching concave-convex interlocking structure 5 is provided between the inner surface of the first fiber cement layer 1, the inner surface of the second fiber cement layer 3, and the corresponding contact surface of the intermediate sound insulation damping layer 2; the concave-convex interlocking structure is wavy. The interlocking concave-convex interlocking structure designed between the two fiber cement layers and the intermediate sound insulation damping layer improves the interlayer bonding strength, shear resistance, and anti-delamination, while optimizing the acoustic interface and reducing sound bridges.
[0037] The manufacturing method of this utility model is as follows:
[0038] 1. Prepare wet blanks of first and second fiber cement boards with concave and convex structures on the inner surface, respectively.
[0039] 2. Prepare a prefabricated intermediate sound insulation damping layer with corresponding complementary concave-convex surface structure.
[0040] 3. Stack the wet blank of the first fiber cement layer, the prefabricated middle sound insulation layer, and the wet blank of the second fiber cement layer in sequence to ensure that the concave and convex structures fit together.
[0041] 4. During or after the layering process, insert the reinforcing connectors at the designed positions and move the limiting blocks inside the connecting bars out and lock them into the cement layer.
[0042] 5. The material is fed into a laminator and cured under certain pressure, temperature and humidity conditions to ensure that the three layers of material are tightly bonded together, while the fiber bundles are cured and anchored.
[0043] 6. Curing, demolding, cutting, and processing of the mortise and tenon structure at the edges.
[0044] 7. Drying, post-treatment (such as surface coating), inspection, and packaging.
[0045] It should be noted that 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 a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0046] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A sound-insulating composite fiber cement board, characterized in that: It includes a first fiber cement layer (1), an intermediate sound insulation damping layer (2) tightly attached to the inner surface of the first fiber cement layer (1), and a second fiber cement layer (3) tightly attached to the other side of the intermediate sound insulation damping layer (2); the intermediate sound insulation damping layer (2) is made of a gradient density porous sound-absorbing material, and the density at the center of the intermediate sound insulation damping layer (2) is greater than the density on both sides; a number of barbed reinforcing connectors (4) are provided through the cement board in the thickness direction.
2. The sound-insulating composite fiber cement board according to claim 1, characterized in that: The gradient density porous sound-absorbing material is made of rock wool strips or glass wool strips with varying density gradients, tightly spliced together.
3. The sound-insulating composite fiber cement board according to claim 2, characterized in that: The reinforcing connector (4) includes a connecting rib (401). Both ends of the connecting rib (401) are provided with a first cavity (402) and a second cavity (403). The end face of the first cavity (402) communicates with the outside. A screw (404) is threaded into the first cavity (402). A nut (405) is connected to the outer end of the screw (404). A conical extrusion block (406) is connected to the inner end of the screw (404). The nut (405) is located inside the first cavity (402), and the extrusion block (406) is located inside the second cavity (403). The sidewall of the connecting rib (401) is provided with multiple... The cavity is connected by a through hole (407). A limiting block (408) is slidably arranged inside the second cavity (403). The outer wall of the limiting block (408) is cone-shaped, and the inner wall is provided with a bevel. The extrusion block (406) is located at the center of the circumference formed by all the limiting blocks (408). The inclination angle of the cone surface of the extrusion block (406) is smaller than the inclination angle of the bevel of the inner wall of the limiting block (408). A central rod (409) is connected to the center of the top wall of the second cavity (403). Multiple springs (410) matching the limiting blocks are connected to the central rod (409). The springs (410) are connected to the corresponding limiting blocks (408).
4. The sound-insulating composite fiber cement board according to claim 3, characterized in that: The upper and lower walls of the through hole (407) are provided with sliding grooves (411), and the upper and lower ends of the limiting block (408) are connected to sliders (412), which are slidably connected in the corresponding sliding grooves (411).
5. The sound-insulating composite fiber cement board according to claim 4, characterized in that: The height of the limiting block (408) is less than the height of the through hole (407).
6. The sound-insulating composite fiber cement board according to claim 5, characterized in that: The inner surface of the first fiber cement layer (1), the inner surface of the second fiber cement layer (3), and the corresponding contact surface of the intermediate sound insulation damping layer (2) are all provided with matching concave-convex interlocking structures (5); the concave-convex interlocking structures are wavy.