Sound-absorbing composite panel and building wall structure

Abstract

The utility model relates to sound absorption structure technical field, concretely provides a kind of sound absorption composite board and building wall structure, the sound absorption composite board, including keel frame, the perforated magnesium oxysulfate board of being arranged in the one side of the keel frame, and the sound absorption material layer filled in the space between the keel frame and the magnesium oxysulfate board.It is the support body of composite board with keel frame, and incident sound wave enters sound absorption material layer by the perforation of the magnesium oxysulfate board and is absorbed.By limiting specific perforation rate and aperture, sound absorption effect can be significantly improved, and the sound absorption coefficient in 500~2000Hz can be greater than 0.7, effectively reduce noise, suitable for the place with requirement to acoustic performance.Meanwhile, using magnesium oxysulfate board as perforated panel, compared with traditional perforated panel, it has comprehensive advantages in fire prevention, moisture resistance, strength and economy, and is more convenient for popularization and application.

Description

Technical Field

[0001] This utility model relates to the field of sound-absorbing structure technology, specifically to a sound-absorbing composite panel and building wall structure. Background Technology

[0002] Public speaking spaces, such as classrooms, lecture halls, and multi-purpose halls, generally face the challenge of poor acoustic performance, with excessively long reverberation times leading to insufficient speech intelligibility being the most prominent issue. Especially in spaces equipped with electroacoustic systems, sound is easily distorted after being amplified by the audio equipment, further exacerbating the difficulty of speech information identification. Therefore, effective indoor acoustic renovation of such spaces is particularly urgent.

[0003] To improve the aforementioned acoustic environment, existing technologies typically employ the addition of sound-absorbing structures to the interior side and rear walls. The aim is to attenuate early reflections from the rear of the space and optimize the uniformity of sound energy distribution. These sound-absorbing structures often use wood panels, gypsum boards, or perforated metal panels as both the finishing and sound-absorbing layers, and frequently utilize the Helmholtz resonance principle to achieve resonant sound absorption.

[0004] However, the application of the aforementioned commonly used materials in lecture spaces has significant limitations: Wood-based panels often fail to meet the Class A fire resistance requirements of interior decoration standards, resulting in many projects falling short; their susceptibility to moisture absorption leads to cracking, deformation, or reduced porosity, consequently decreasing sound absorption performance (NRC coefficient); furthermore, plywood poses a safety hazard due to formaldehyde release. Gypsum board and perforated gypsum board have poor moisture and weather resistance, easily causing the internal sound-absorbing materials to become damp and ineffective; additionally, gypsum board has low nail-holding power, making it unsuitable for hanging equipment or signage, limiting its application in various indoor scenarios. While perforated metal panels are well-processed and have good toughness, they are expensive and have a cold surface; metal panels are prone to deformation and denting under stress, and damaged coatings easily rust, increasing maintenance costs. Therefore, it is evident that existing commonly used wall sound-absorbing structures have many shortcomings in terms of material performance, safety, durability, cost, and ease of construction. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a sound-absorbing composite panel and building wall structure. This composite panel uses a keel frame as a support, and incident sound waves are absorbed by entering the sound-absorbing material layer through the perforations in the magnesium oxysulfate board. By limiting specific perforation rates and pore sizes, the sound absorption effect can be significantly improved, effectively reducing noise, making it suitable for locations with acoustic performance requirements. Furthermore, using magnesium oxysulfate board as the perforated panel offers comprehensive advantages over traditional perforated panels in terms of fire resistance, moisture resistance, strength, and economy, making it easier to promote and apply.

[0006] The first aspect of this utility model provides a sound-absorbing composite panel, comprising: a keel frame; a magnesium oxysulfate board fixed to one side of the keel frame, the magnesium oxysulfate board having perforations with a perforation rate of 12% to 18% and a perforation diameter of 2 mm to 8 mm; and the space between the side of the keel frame away from the magnesium oxysulfate board and the magnesium oxysulfate board being filled with sound-absorbing material to form a sound-absorbing material layer.

[0007] This invention provides a sound-absorbing composite panel, comprising a keel frame, a perforated magnesium oxysulfate board disposed on one side of the keel frame, and a sound-absorbing material layer filling the space between the keel frame and the magnesium oxysulfate board. The composite panel uses the keel frame as a support, and incident sound waves are absorbed by entering the sound-absorbing material layer through the perforations in the magnesium oxysulfate board. By limiting specific perforation rates and pore sizes, the sound absorption effect can be significantly improved, effectively reducing noise, making it suitable for locations with acoustic performance requirements. Furthermore, using magnesium oxysulfate board as the perforated panel offers comprehensive advantages over traditional perforated panels in terms of fire resistance, moisture resistance, strength, and economy, making it easier to promote and apply.

[0008] As a preferred embodiment of this utility model, the keel frame is a light steel keel or a wooden keel.

[0009] As a preferred embodiment of this utility model, the perforation rate of the magnesium oxysulfate plate is 15% to 18%, and the pore diameter is 5mm to 6mm.

[0010] As a preferred embodiment of this utility model, the thickness of the magnesium oxysulfate plate is 3mm to 12mm.

[0011] As a preferred embodiment of this utility model, the surface of the magnesium oxysulfate board is provided with a topcoat layer.

[0012] As a preferred embodiment of this utility model, the sound-absorbing material layer is a glass wool layer or a rock wool layer.

[0013] As a preferred embodiment of this utility model, the thickness of the sound-absorbing material layer is 40mm to 60mm.

[0014] As a preferred embodiment of this utility model, a non-woven fabric insulating layer is bonded to the side of the keel frame near the magnesium oxysulfate board.

[0015] The second aspect of this utility model provides a building wall structure, including a wall body and the aforementioned sound-absorbing composite board, wherein the wall body is fixedly connected to the side of the keel frame away from the magnesium oxysulfate board.

[0016] This utility model provides a building wall structure that can reduce noise and enhance fire safety by directly fixing the keel frame of the sound-absorbing composite panel to the wall body.

[0017] As a preferred embodiment of this utility model, a cavity structure is formed between the wall body and the keel frame.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] 1. This utility model provides a sound-absorbing composite panel, comprising a keel frame, a perforated magnesium oxysulfate board disposed on one side of the keel frame, and a sound-absorbing material layer filling the space between the keel frame and the magnesium oxysulfate board. The composite panel uses the keel frame as a support, and incident sound waves enter the sound-absorbing material layer through the perforations in the magnesium oxysulfate board and are absorbed. By limiting specific perforation rates and pore sizes, the sound absorption effect can be significantly improved, with a sound absorption coefficient greater than 0.7 in the 500–2000 Hz range, effectively reducing noise and making it suitable for locations with acoustic performance requirements. Furthermore, using magnesium oxysulfate board as the perforated panel offers comprehensive advantages over traditional perforated panels in terms of fire resistance, moisture resistance, strength, and economy, making it easier to promote and apply.

[0020] 2. This utility model provides a building wall structure that can achieve noise reduction and enhanced fire safety by directly fixing the keel frame of the sound-absorbing composite board to the wall body. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the building wall structure of this utility model.

[0022] Figure 2 The figures show test data for embodiments and comparative examples of this utility model.

[0023] Figure 3 This is a graph showing the test data of the sound absorption coefficient of the building wall structure under different perforation rates in this embodiment.

[0024] Figure 4 This is a graph showing the test data of the sound absorption coefficient of the building wall structure under different thicknesses of magnesium oxysulfate board in this embodiment.

[0025] The diagram is labeled as follows: 1 - keel frame; 2 - magnesium oxysulfate board; 3 - sound-absorbing material layer; 4 - wall body; 41 - cavity structure. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0027] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0028] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0029] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0030] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0031] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0032] like Figure 1 As shown, this embodiment provides a sound-absorbing composite panel, comprising: a keel frame 1; a magnesium oxysulfate board 2 fixed to one side of the keel frame 1, the magnesium oxysulfate board 2 having perforations with a perforation rate of 12% to 18% and a perforation diameter of 2 mm to 8 mm; the space between the side of the keel frame 1 away from the magnesium oxysulfate board 2 and the magnesium oxysulfate board 2 is filled with sound-absorbing material to form a sound-absorbing material layer 3. In some embodiments, the perforations are circular or square in shape.

[0033] This composite panel uses a keel frame 1 as its support. Incident sound waves enter the sound-absorbing material layer 3 through the perforations of the magnesium oxysulfate board 2 and are absorbed. By limiting the specific perforation rate and pore size, the sound absorption effect can be significantly improved, effectively reducing noise, making it suitable for places with acoustic performance requirements. At the same time, using magnesium oxysulfate board 2 as the perforated panel has comprehensive advantages over traditional perforated panels in terms of fire resistance, moisture resistance, strength, and economy, making it easier to promote and apply.

[0034] In some embodiments, the keel frame 1 is a light steel keel or a wood keel. Light steel keels possess high strength, excellent fire and moisture resistance, and standardized installation interfaces, significantly improving the overall structural stability and service life of the composite panel, making them particularly suitable for public buildings with high fire resistance and durability requirements. Wood keels, on the other hand, have natural elasticity and are easy to cut and adjust on-site, allowing for flexible adaptation to complex installation surfaces. Their porous fiber structure also helps enhance low-frequency sound absorption, and the material cost is more economical. Both types of keels effectively support the magnesium oxysulfate board 2 and the sound-absorbing material layer 3, simplifying the construction process and reducing overall costs, providing adaptability options for different application scenarios.

[0035] Preferably, the perforation rate of the magnesium oxysulfate board 2 is 15%–18%, and the pore size is 5mm–6mm. More preferably, the perforation rate of the magnesium oxysulfate board 2 is 15.5%–17.6%. Studies have found that controlling the perforation rate and pore size of the magnesium oxysulfate board 2 within a reasonable range enables the building wall structure to achieve an NRC ≥ 0.85 and broadband sound absorption characteristics, thus achieving better sound absorption performance.

[0036] In some embodiments, the thickness of the magnesium oxysulfate board 2 is 3mm to 12mm. Preferably, the thickness of the magnesium oxysulfate board 2 is 5mm to 8mm. Reasonably controlling the thickness of the magnesium oxysulfate board 2 not only ensures the strength requirements of the sound-absorbing composite structure and achieves a better sound absorption effect, but also effectively controls costs.

[0037] In some embodiments, the surface of the magnesium oxysulfate board 2 is provided with a topcoat layer. The magnesium oxysulfate board 2 is a board material made primarily of magnesium oxide and magnesium sulfate, possessing fire-resistant and waterproof properties. The topcoat layer is the final coating applied to the surface of the object. It protects the magnesium oxysulfate board 2, enhances its appearance, increases durability, and improves stain resistance. It can also impart specific colors, glosses, and other decorative effects to the magnesium oxysulfate board 2 according to different needs. In some specific operations, the magnesium oxysulfate board undergoes surface treatment by spraying a primer (with a film thickness of not less than 40 μm). After the primer surface dries completely, the board surface is sanded to achieve the required smoothness, and then a topcoat (with a film thickness of not less than 40 μm) is sprayed.

[0038] In some embodiments, the sound-absorbing material layer 3 is a glass wool layer or a rock wool layer. Glass wool is a man-made inorganic fiber with good sound absorption, heat insulation, and thermal insulation properties. Rock wool is an inorganic fiber material made from natural rocks such as basalt and dolomite as the main raw materials, which are melted and fiberized at high temperatures. It also has excellent sound absorption and noise reduction capabilities and good fire resistance.

[0039] In some embodiments, the thickness of the sound-absorbing material layer 3 is 40mm to 60mm. Sound-absorbing material is a material that can absorb sound energy. Selecting a sound-absorbing material layer 3 within this thickness range can, to a certain extent, ensure that its sound absorption effect and other performance characteristics reach a good state.

[0040] In some embodiments, a non-woven fabric insulating layer is adhered to the side of the keel frame 1 adjacent to the magnesium oxysulfate board 2. The non-woven fabric insulating layer is an insulating layer made of high-density non-woven fabric. Non-woven fabric is a fabric formed without spinning and weaving, possessing properties such as moisture resistance, breathability, and flexibility. In this embodiment, the non-woven fabric surface density should be 62 g / m³. 2 The thickness should not be less than 1mm. On the surface of the keel frame 1 facing the magnesium oxysulfate board 2, a non-woven insulation layer is attached by adhesive. This insulation layer can prevent the sound-absorbing material layer 3 from escaping, and at the same time can play a role in moisture protection, sound insulation, buffering, and preventing the keel frame 1 from directly contacting the magnesium oxysulfate board 2 to prevent wear or other adverse effects.

[0041] The second aspect of this embodiment provides a building wall structure, including a wall body 4 and the aforementioned sound-absorbing composite board, wherein the wall body 4 is fixedly connected to the side of the keel frame 1 away from the magnesium oxysulfate board 2.

[0042] This utility model provides a building wall structure that can achieve noise reduction and enhanced fire safety by directly fixing the keel frame 1 of the sound-absorbing composite board to the wall body 4.

[0043] In some embodiments, a cavity structure 41 is formed between the wall body 4 and the keel frame 1. By combining the Helmholtz resonance sound absorption principle and the characteristics of porous sound-absorbing materials, and based on the sound absorption principle of composite perforated sound-absorbing panels, the overall acoustic performance is improved.

[0044] In some embodiments, countersunk screws are used to fix the magnesium oxysulfate board 2 to the keel frame 1; the junction between the sound-absorbing composite board and the ground and ceiling is sealed with metal skirting boards / metal strips, and the gaps are filled with polyurethane foam sealant.

[0045] To better understand the technical solutions of the above embodiments, the following preferred implementation methods are provided for further explanation.

[0046] Example 1

[0047] A sound-absorbing composite panel includes a keel frame 1, which is a light steel keel; a magnesium oxysulfate board 2 fixed to one side of the keel frame 1; and a non-woven fabric insulating layer bonded to the side of the keel frame 1 closest to the magnesium oxysulfate board 2, the non-woven fabric having a surface density of 62 g / m². 2 The magnesium oxysulfate board 2 has perforations with a 5mm hole diameter, 11mm hole spacing, and a perforation rate of 16.2%. The board thickness is 8mm, and its standard density ρ is 220 kg / m³. Its combustion performance is A1 grade. The space between the side of the keel frame 1 away from the magnesium oxysulfate board 2 and the board 2 is filled with sound-absorbing material: glass wool, forming a sound-absorbing material layer 3 with a layer density of 60 kg / m³. 2 .

[0048] The sound-absorbing composite board is connected to the wall body 4, and the wall body 4 is fixedly connected to the side of the keel frame 1 away from the magnesium oxysulfate board 2. A cavity structure 41 is formed between the wall body 4 and the keel frame 1, the space between the magnesium oxysulfate board 2 and the wall body 4 is 100mm, and the sound-absorbing material layer 3 is 50mm.

[0049] Example 2

[0050] Example 2 uses the same structure as Example 1, except that in the sound-absorbing composite board of Example 2, the magnesium oxysulfate board 2 has a 4.5mm hole diameter, a 9.5mm hole spacing, an 8mm board thickness, and a 17.6% perforation rate.

[0051] Example 3

[0052] Example 3 uses the same structure as Example 1, except that in the sound-absorbing composite board of Example 3, the magnesium oxysulfate board 2 has a pore diameter of 2mm, a pore spacing of 4.5mm, a board thickness of 8mm, and a perforation rate of 15.5%.

[0053] Example 4

[0054] Example 4 uses the same structure as Example 1, except that in the sound-absorbing composite board of Example 4, the magnesium oxysulfate board has a 2: 3mm hole diameter, 6.5mm hole spacing, 3mm board thickness, and 16.7% perforation rate.

[0055] Example 5

[0056] Example 5 uses the same structure as Example 1, except that in the sound-absorbing composite board of Example 5, the magnesium oxysulfate board has a 2:3mm hole diameter, 6.5mm hole spacing, 5mm board thickness, and 16.7% perforation rate.

[0057] Example 6

[0058] Example 6 uses the same structure as Example 1, except that in the sound-absorbing composite board of Example 6, the magnesium oxysulfate board has a 2:3mm hole diameter, 6.5mm hole spacing, 8mm board thickness, and 16.7% perforation rate.

[0059] Comparative Example 1

[0060] Comparative Example 1 uses the same structure as Example 1, except that in the sound-absorbing composite board of Comparative Example 1, the magnesium oxysulfate board 2 has a 5mm hole diameter, a 13.5mm hole spacing, an 8mm board thickness, and a 10.8% perforation rate.

[0061] Comparative Example 2

[0062] Comparative Example 2 uses the same structure as Example 1, except that in the sound-absorbing composite board of Comparative Example 2, the magnesium oxysulfate board 2 has a 5mm hole diameter, an 18mm hole spacing, an 8mm board thickness, and a 6.1% perforation rate.

[0063] Comparative Example 3

[0064] Comparative Example 3 has the same structure as Example 1, except that in the sound-absorbing composite board of Comparative Example 3, the magnesium oxysulfate board is 2:8mm thick and has no perforation treatment.

[0065] Comparative Example 4

[0066] Comparative Example 4 uses the same structure as Example 1, except that in the sound-absorbing composite board of Comparative Example 4, the magnesium oxysulfate board 2 has a pore diameter of 3 mm, a pore spacing of 6.5 mm, a board thickness of 12 mm, and a perforation rate of 16.7%.

[0067] Comparative Example 5

[0068] Comparative Example 5 uses the same structure as Example 1, except that in the sound-absorbing composite panel of Comparative Example 5, the magnesium oxysulfate board 2 has a 5mm pore diameter, an 11mm pore spacing, an 8mm board thickness, and a 16.2% perforation rate. A cavity structure 41 is formed between the wall body 4 and the keel frame 1, the space between the magnesium oxysulfate board 2 and the wall body 4 is 70mm, and the sound-absorbing material layer 3 is 25mm thick.

[0069] test

[0070] Performance tests were conducted on the building wall structures of Examples 1-6 and Comparative Examples 1-5. After testing within the acoustic impedance tube system according to the requirements of the relevant standard GB / T 18696.2 "Measurement of sound absorption coefficient and acoustic impedance in impedance tubes - Part 2: Transfer function method", the structures were installed in a standard reverberation laboratory and tested and verified according to the relevant requirements of GB / T20247 "Acoustic reverberation chamber sound absorption measurement".

[0071] Test results are as follows Figure 2-4 As shown.

[0072] The test results show that, comparing the sound absorption data of Examples 1-3 with those of Comparative Examples 1-3, it can be found that the perforation rate of the magnesium oxysulfate perforated plate is... The sound absorption effect is optimal within the design range of 15% to 18%. Increasing the thickness of the panel reduces sound insulation and significantly increases product cost. Analysis of the test results of Examples 4-6 and Comparative Example 4 shows that the overall NRC coefficient of the structure reaches 0.9 when the thickness is 3mm / 5mm. Increasing the thickness reduces the NRC by 0.05, while the position of the sound absorption peak remains unchanged. Considering both panel processing costs and strength requirements, a suitable design range of 5-8mm is proposed.

[0073] Example 7

[0074] This embodiment verifies the construction reliability and acoustic superiority of the invented structure through two indoor acoustic renovation projects. The acoustic renovation projects include Project Example 1 and Example 2. After applying the structural renovation of the above-mentioned Example 1, the reverberation time of each frequency band in the room was significantly reduced, and all met the standard values ​​required by the "Code for Sound Insulation Design of Civil Buildings" GB50118.

[0075] Project Example 1: A shoebox-shaped classroom space with an internal volume of 420m³. The present invention is applied to the side walls and rear wall, with a total renovation area of ​​70m³. 2 ;

[0076] Project Example 2: A shoebox-shaped classroom space with an internal volume of 1435m³. The invention is applied to the side walls and rear wall, with a total renovation area of ​​100m². 2 .

[0077] The results are shown in Table 1.

[0078] Table 1

[0079]

[0080] Therefore, it can be seen that this utility model innovatively uses magnesium oxysulfate board 2 as a perforated board material, which has comprehensive advantages in fire resistance, moisture resistance, economy and strength compared with traditional perforated boards. It has also developed a wall composite sound-absorbing structure with NRC≥0.85 and component fire resistance limit≥2 hours, which can meet the interior decoration requirements of most spaces, fill the technical gap of magnesium oxysulfate board 2 in acoustic applications, and broaden the application scenarios of the material.

[0081] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A sound-absorbing composite panel, characterized in that, include: Keel frame (1); A magnesium oxysulfate plate (2) is fixed to one side of the keel frame (1). The magnesium oxysulfate plate (2) is provided with perforations, with a perforation rate of 12% to 18% and a hole diameter of 2 mm to 8 mm. The space between the side of the keel frame (1) away from the magnesium oxysulfate board (2) and the magnesium oxysulfate board (2) is filled with sound-absorbing material to form a sound-absorbing material layer (3).

2. The sound-absorbing composite panel according to claim 1, characterized in that, The keel frame (1) is a light steel keel or a wooden keel.

3. The sound-absorbing composite panel according to claim 1, characterized in that, The perforation rate of the magnesium oxysulfate plate (2) is 15% to 18%, and the pore size is 5 mm to 6 mm.

4. The sound-absorbing composite panel according to claim 1, characterized in that, The thickness of the magnesium oxysulfate plate (2) is 3mm to 12mm.

5. The sound-absorbing composite panel according to claim 1, characterized in that, The surface of the magnesium oxysulfide board (2) is provided with a topcoat layer.

6. The sound-absorbing composite panel according to claim 1, characterized in that, The sound-absorbing material layer (3) is a glass wool layer or a rock wool layer.

7. The sound-absorbing composite panel according to claim 6, characterized in that, The thickness of the sound-absorbing material layer (3) is 40mm to 60mm.

8. The sound-absorbing composite panel according to any one of claims 1-7, characterized in that, The keel frame (1) has a non-woven fabric insulating layer bonded to the side near the magnesium oxysulfate board (2).

9. A building wall structure, characterized in that, Includes a wall body (4) and a sound-absorbing composite board as described in any one of claims 1-8, wherein the wall body (4) is fixedly connected to the side of the keel frame (1) away from the magnesium oxysulfate board (2).

10. The building wall structure according to claim 9, characterized in that, A cavity structure (41) is formed between the wall body (4) and the keel frame (1).

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