Fabricated building panel made from industrial gypsum

Abstract

The utility model discloses an assembly type building board made of industrial gypsum relates to assembly type building material technical field. Including reinforcing layer and the industrial gypsum base material layer and cement base impermeable layer that set gradually in reinforcing layer both sides along the self thickness direction, reinforcing layer is located in the middle part of assembly type building board, and with the length direction of board is identical, and industrial gypsum base material layer sets up in the upper and lower both sides of reinforcing layer respectively, and cement base impermeable layer coats in the upper and lower outer surface of industrial gypsum base material layer, and one end of assembly type building board is provided with tenon, and the other end is provided with the groove that is compatible with tenon, and assembly type building board can be connected gradually along the self length direction through tenon and groove. The utility model will multiple industrial solid waste as main raw material, and the solid waste landfill amount is greatly reduced, and the environmental pollution is reduced, and through tenon, groove is spliced, and the installation efficiency is promoted.

Description

Technical Field

[0001] This utility model relates to the field of prefabricated building materials technology, specifically a prefabricated building panel made of industrial gypsum. Background Technology

[0002] With the advancement of industrialized construction, prefabricated buildings have been widely used due to their advantages such as efficient installation and low construction pollution. The performance and environmental friendliness of their core materials (such as building panels) have become a key research focus. Currently, most prefabricated building panels on the market are made from natural gypsum, cement, or lightweight aggregates, which presents two major problems: first, natural gypsum resources are highly dependent, with high mining costs and a tendency to cause ecological damage; second, some panels lack sufficient fire resistance and thermal insulation properties, making it difficult to meet green building standards.

[0003] Meanwhile, the industrial sector (such as steel and hydrogen fluoride production) generates a large amount of industrial gypsum solid waste annually. According to research, one group alone generates approximately 1 million tons of desulfurization gypsum, 1.3 million tons of fluorogypsum, and 200,000 tons of neutralization slag (a mixture of calcium sulfate and magnesium hydroxide) annually. Currently, this solid waste is mainly disposed of through landfill, which not only occupies land resources but may also cause soil or groundwater pollution due to residual fluorine and sulfur in the gypsum.

[0004] While existing technologies have attempted to use single industrial gypsum (such as desulfurized gypsum) to produce building panels, significant drawbacks exist: First, desulfurized gypsum has a high moisture content (10-15%), making the resulting panels prone to cracking and lacking strength. Second, fluorogypsum has a slow hydration rate, requiring long-term curing when used alone, resulting in low production efficiency. Third, the panels are mostly monolithic structures, requiring on-site cutting and splicing during installation, a complex process that is difficult to adapt to the rapid construction requirements of prefabricated buildings. Furthermore, due to the complex composition of neutralization slag, current technologies have not effectively combined it with desulfurized gypsum and fluorogypsum for panel preparation, limiting the utilization rate of solid waste.

[0005] Therefore, there is an urgent need to develop a building board that can synergistically utilize various industrial gypsums, has excellent performance, and is suitable for prefabricated construction, in order to solve the problems of solid waste pollution, resource waste, and the technical bottlenecks of existing building boards. Utility Model Content

[0006] The purpose of this invention is to provide a prefabricated building panel made of industrial gypsum to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a prefabricated building panel made of industrial gypsum. The prefabricated building panel includes a reinforcing layer along its thickness direction, and an industrial gypsum substrate layer and a cement-based anti-seepage layer sequentially arranged on both sides of the reinforcing layer. The reinforcing layer is located in the middle of the prefabricated building panel and is aligned with the length direction of the panel. The industrial gypsum substrate layer is respectively arranged on the upper and lower sides of the reinforcing layer. The industrial gypsum substrate layer is made of various industrial gypsum materials. The cement-based anti-seepage layer is coated on the upper and lower outer surfaces of the industrial gypsum substrate layer and is made of corresponding cement-based materials. One end of the prefabricated building panel is provided with a tenon, and the other end is provided with a groove adapted to the tenon. The prefabricated building panel can be connected sequentially along its length direction through the tenon and the groove. Preferably, the industrial gypsum substrate layer is made using desulfurized gypsum, fluorogypsum, and neutralization slag as the main raw materials.

[0008] Based on the above technical features, this utility model uses three types of industrial solid waste—desulfurized gypsum, fluorogypsum, and neutralization slag—as main raw materials, achieving a utilization rate of over 85%, significantly reducing solid waste landfill volume and environmental pollution. Simultaneously, leveraging the high moisture content (approximately 30%) and low thermal conductivity of fluorogypsum, the board achieves a Class A fire resistance rating and superior thermal insulation performance compared to traditional cement boards. The industrial gypsum substrate layer, modified with neutralization slag and reinforced with a strengthening layer, achieves a 28-day compressive strength ≥40MPa and a flexural strength ≥5MPa, meeting building structural requirements. The cement-based impermeable layer ensures a water absorption rate of ≤8%, exceeding industry standards. Prefabricated building panels eliminate the need for on-site cutting; they are joined using tenons and grooves, increasing installation efficiency by over 30% and facilitating rapid construction.

[0009] Preferably, in this technical solution, the reinforcing layer is selected from one layer of glass fiber mesh or one layer of basalt fiber cloth, embedded between two industrial gypsum substrate layers; or, the reinforcing layer is selected from two layers of glass fiber mesh or two layers of basalt fiber cloth, and uniformly laid between two industrial gypsum substrate layers along the thickness direction of the prefabricated building panel. More preferably, when the reinforcing layer uses glass fiber mesh embedded between two industrial gypsum substrate layers, the mesh count of the selected glass fiber mesh is 80-120.

[0010] Based on the above technical characteristics, using glass fiber mesh or basalt fiber cloth as a reinforcing layer can significantly improve the flexural strength and durability of the board.

[0011] Preferably, in this technical solution, the dimensions of the prefabricated building panel along its thickness direction are 60mm to 120mm, wherein the thickness of the cement-based anti-seepage layer is 0.5mm to 1mm, and the thickness ratio of the industrial gypsum substrate layer to the reinforcing layer is 1.5 to 2.5.

[0012] Preferably, in this technical solution, the cross-sectional shape of the tenon is trapezoidal, and the tenon is narrower than its bottom end away from the top of the prefabricated building panel; the shape of the groove matches the tenon, and the tenon on one of the prefabricated building panels is embedded in the groove of the adjacent prefabricated building panel.

[0013] Based on the above technical features, the trapezoidal cross-section design of the tenon increases friction through inclined contact, thereby enhancing the connection stability of two adjacent prefabricated building panels; at the same time, the trapezoidal groove and the trapezoidal inclined surface design of the tenon also facilitate quick alignment and positioning, improving construction efficiency.

[0014] Preferably, in this technical solution, a sealing groove is provided on the side wall of one end of the groove in the prefabricated building panel. When two adjacent prefabricated building panels are spliced ​​together, the sealing groove can cooperate with the side wall of one end of the tenon to form a sealed cavity. A sealing strip is installed in the formed sealed cavity, and the outer contour of the selected sealing strip matches the sealing groove. More preferably, two sealing grooves are provided, and the two sealing grooves are symmetrically arranged on the left and right sides of the groove.

[0015] Based on the above technical features, prefabricated building panels are spliced ​​together using tenon and groove structures, and with the help of sealing strips, the waterproof sealing effect at the splicing points is improved, preventing leakage from the gaps between the panels.

[0016] In this technical solution, the sealing strip is preferably made of EPDM rubber.

[0017] In this technical solution, preferably, screw holes are provided on the tenons and grooves of the prefabricated building panels along the width direction, so that the tenons can pass through the tenons; two adjacent prefabricated building panels can be fastened together by self-tapping screws passing through the screw holes.

[0018] Based on the above technical features, the boards are fixed together with self-tapping screws (passing through the reserved screw holes), eliminating the need for additional plastering and allowing them to proceed directly to the subsequent decoration process, thus greatly improving installation efficiency. Attached Figure Description

[0019] Figure 1 This is a cross-sectional schematic diagram of the prefabricated building panel in this utility model;

[0020] Figure 2 This is a structural schematic diagram of the prefabricated building panel in this utility model;

[0021] Figure 3 This is a schematic diagram of the structure after two adjacent prefabricated building panels are spliced ​​together in this utility model.

[0022] In the diagram: 1. Prefabricated building panel; 11. Reinforcing layer; 12. Industrial gypsum substrate layer; 13. Cement-based impermeable layer; 2. Tenon; 3. Groove; 4. Sealing groove; 5. Sealing strip; 6. Self-tapping screw. Detailed Implementation

[0023] 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.

[0024] It should be noted that in the description of this utility model, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] Furthermore, it should be understood that, for ease of description, the dimensions of the various components shown in the accompanying drawings are not drawn to actual scale.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined or described in one figure, it will not need to be discussed or described in detail in the description of the subsequent figures.

[0027] Before understanding this utility model, it is important to know that industrial gypsum solid waste has a wide range of sources and its cost is much lower than that of natural gypsum. Moreover, in the process of producing boards, only room temperature curing or low temperature drying is required, without the need for high temperature calcination, which reduces energy consumption by 20%-30% and makes it economically competitive.

[0028] like Figures 1 to 3 As shown, this utility model provides the following technical solution: a prefabricated building panel 1 made of industrial gypsum. The prefabricated building panel 1 includes a reinforcing layer 11 along its thickness direction, and an industrial gypsum substrate layer 12 and a cement-based anti-seepage layer 13 sequentially arranged on both sides of the reinforcing layer 11. The reinforcing layer 11 is located in the middle of the prefabricated building panel 1 and is aligned with the length direction of the panel. The industrial gypsum substrate layer 12 is respectively disposed on the upper and lower sides of the reinforcing layer 11. The industrial gypsum substrate layer 12 is made of various industrial gypsum materials. The cement-based anti-seepage layer 13 is coated on the upper and lower outer surfaces of the industrial gypsum substrate layer 12 and is made of corresponding cement-based materials.

[0029] like Figure 1 As shown, the longitudinal cross-sectional structure of the board is displayed. From top to bottom, it consists of a cement-based anti-seepage layer 13, an industrial gypsum substrate layer 12, a reinforcing layer 11, an industrial gypsum substrate layer 12, and a cement-based anti-seepage layer 13. The reinforcing layer 11 is horizontally embedded in the middle of the industrial gypsum substrate layer 12, consistent with the length direction of the board.

[0030] Furthermore, the industrial gypsum substrate layer 12, serving as the core functional layer of the board, is made primarily from three types of industrial gypsum: desulfurized gypsum, fluorogypsum, and neutralization slag. The raw materials, by mass percentage, are: desulfurized gypsum 40%-60%, fluorogypsum 20%-30%, neutralization slag modified powder 5%-15%, activator 2%-5%, and the remainder being water. Specifically, the desulfurized gypsum provides basic cementitious properties (calcium sulfate dihydrate content ≥90%), the fluorogypsum enhances fire resistance and thermal insulation (anhydrous calcium sulfate content ≥90%), the neutralization slag modified powder (neutralization slag powder modified with sodium phosphate) improves the board's strength and crack resistance, and the activator (aluminum sulfate / sodium sulfate) accelerates the hydration of the fluorogypsum, shortening the curing cycle. A cement-based impermeable layer 13 covers the upper and lower outer surfaces of the industrial gypsum substrate layer 12, using a polymer cement-based coating (solid content ≥60%) with a thickness of 0.5mm-1mm, addressing the issue of water absorption in industrial gypsum boards.

[0031] Furthermore, the reinforcing layer 11 is selected from one layer of fiberglass mesh or one layer of basalt fiber cloth, and embedded between the two industrial gypsum substrate layers 12; alternatively, the reinforcing layer 11 is selected from two layers of fiberglass mesh or two layers of basalt fiber cloth, and is evenly laid between the two industrial gypsum substrate layers 12 along the thickness direction of the prefabricated building panel 1 to improve the flexural strength of the panel. Preferably, when the reinforcing layer 11 uses fiberglass mesh embedded between the two industrial gypsum substrate layers 12, the mesh count of the selected fiberglass mesh is 80 to 120, and the specific values ​​can be selected as 80 mesh, 85 mesh, 90 mesh, 95 mesh, 100 mesh, 105 mesh, 110 mesh, 115 mesh, 120 mesh, and any value between two adjacent specific values ​​mentioned above.

[0032] Specifically, the prefabricated building panel 1 along its own thickness direction ( Figure 1 The dimensions (in the top and bottom directions) are 60mm to 120mm, along its own length direction ( Figure 1 The dimensions (front and back direction) are 2400mm to 3000mm, along its own width direction ( Figure 1 The dimensions (in the left-right direction) are 600mm to 1200mm. The thickness of the cement-based impermeable layer 13 is 0.5mm to 1mm, and the thickness ratio of the industrial gypsum substrate layer 12 to the reinforcing layer 11 is 1.5 to 2.5.

[0033] This invention utilizes three types of industrial solid waste—desulfurized gypsum, fluorogypsum, and neutralization slag—as main raw materials, achieving a utilization rate of over 85%, significantly reducing solid waste landfill volume and environmental pollution. Simultaneously, leveraging the high moisture content (approximately 30%) and low thermal conductivity (1.5-1.9 W / (m·K)) of fluorogypsum, the board achieves a Class A fire rating and superior thermal insulation performance compared to traditional cement boards. The industrial gypsum substrate layer 12, modified with neutralization slag and reinforced by the reinforcing layer 11, exhibits a 28-day compressive strength ≥40 MPa and a flexural strength ≥5 MPa, meeting building structural requirements. The cement-based impermeable layer 13 ensures the board's water absorption rate is ≤8%, exceeding industry standards.

[0034] like Figure 2 and Figure 3 As shown, one end of the prefabricated building panel 1 is provided with a tenon 2, and the other end is provided with a groove 3 that matches the tenon 2. The prefabricated building panel 1 can be connected sequentially along its length through the tenon 2 and the groove 3. In this utility model, the prefabricated building panel 1 does not require on-site cutting. By splicing through the tenon 2 and the groove 3, the installation efficiency is improved by more than 30%, making it suitable for rapid construction.

[0035] Furthermore, the tenon 2 has a trapezoidal cross-sectional shape, and the top of the tenon 2 is narrower than its bottom end away from the prefabricated building panel 1. The shape of the groove 3 matches the tenon 2, and the tenon 2 on one of the prefabricated building panels 1 is embedded in the groove 3 of the adjacent prefabricated building panel 1. The trapezoidal cross-sectional design of the tenon 2 increases friction through inclined contact, thereby enhancing the connection stability of the two adjacent prefabricated building panels 1. At the same time, the trapezoidal groove 3 and the trapezoidal inclined surface design of the tenon 2 also facilitate quick alignment and positioning, improving construction efficiency.

[0036] Furthermore, a sealing groove 4 is provided on one side wall of the groove 3 of the prefabricated building panel 1. When two adjacent prefabricated building panels 1 are spliced ​​together, the sealing groove 4 can cooperate with the side wall of one end of the tenon 2 to form a sealed cavity. A sealing strip 5 is installed in the formed sealed cavity, and the outer contour of the selected sealing strip 5 matches the sealing groove 4. Preferably, the sealing strip 5 is made of EPDM rubber, such as... Figure 2 and Figure 3 As shown, there are two sealing grooves 4, which are symmetrically arranged on the left and right sides of the groove 3. The prefabricated building panels 1 are spliced ​​together by the tenon 2 and groove 3 structure, and with the sealing strip 5, the waterproof sealing effect at the splice is improved, and leakage between the panels is prevented. Of course, in other embodiments, an annular sealing groove is opened at one end of the tenon 2 or groove 3 of the panel, and the annular sealing groove is used to accommodate the annular sealing strip.

[0037] Specifically, the top width of the tenon 2 away from the board is 20mm, the bottom width is 30mm, and the height can be 10mm to 15mm. The inner wall of the groove 3 has a sealing groove 4 with a width of 5mm to 8mm and a depth of 3mm to 5mm.

[0038] like Figure 2 As shown, along the width direction of the prefabricated building panel 1, screw holes for passing through the tenon 2 are provided on the tenon 2 and the groove 3 of the prefabricated building panel 1. Figure 3 As shown, two adjacent assembled prefabricated building panels 1 can be fastened together by self-tapping screws 6 passing through screw holes.

[0039] The present invention will be further described in detail below with reference to two specific embodiments:

[0040] Example 1:

[0041] (1) Raw material preparation:

[0042] ① Desulfurized gypsum: Taken from the wet desulfurization process of a steel plant, with a calcium sulfate dihydrate content of 92% and a moisture content of 12%. It is dried (temperature 105℃, time 2h) until the moisture content is ≤5% and then pulverized to a fineness of 180 mesh.

[0043] ② Fluorogypsum: Taken from the hydrogen fluoride production line, with anhydrous calcium sulfate content of 91%, it is neutralized with lime (pH=7) and then pulverized to a fineness of 200 mesh;

[0044] ③ Neutralization residue modified powder: Neutralization residue (a mixture of calcium sulfate and magnesium hydroxide) is ground to 325 mesh using a ball mill, 4% sodium phosphate (by mass) is added, and after stirring evenly, it is dried at 80℃ for 1 hour to obtain modified powder;

[0045] ④Activator: Industrial-grade aluminum sulfate (purity ≥ 98%) is used;

[0046] ⑤ Reinforcing layer: 80-mesh fiberglass mesh;

[0047] ⑥ Cement-based anti-seepage layer: Polymer cement-based coating (65% solids content);

[0048] ⑦ Sealing strip: EPDM rubber strip (cross-section matches the sealing groove).

[0049] (2) Preparation of industrial gypsum substrate layer:

[0050] Weigh the raw materials by mass percentage: 50% desulfurized gypsum, 25% fluorogypsum, 10% neutralization residue modified powder, 3% aluminum sulfate activator, and the remainder is water (water-to-material ratio 0.25); add the above raw materials to the mixer and stir for 15 minutes until a uniform slurry is formed.

[0051] (3) Sheet forming:

[0052] ① Lay a layer of cement-based anti-seepage coating (0.5mm thick) inside the prefabricated panel mold (with pre-set tenon, groove and sealing groove structure) and wait for it to dry to the surface (about 10 minutes);

[0053] ② Pour in 1 / 2 volume of composite substrate slurry, lay a layer of glass fiber mesh (consistent with the mold size, without wrinkles), then pour in the remaining 1 / 2 slurry, and vibrate to compact (frequency 50Hz, time 2min).

[0054] ③ After curing at room temperature (25℃, 60% humidity) for 24 hours, demold and continue curing for 7 days;

[0055] (4) Post-processing:

[0056] A cement-based impermeable coating with a thickness of 0.5 mm is applied to the exposed surface of the board (excluding the contact surface of the tenon and groove), and dried at room temperature for 24 hours to obtain the finished board (dimensions: length 2400 mm, width 1200 mm, thickness 80 mm).

[0057] (5) Performance testing:

[0058] ① Compressive strength: 45MPa (GB / T17671-2021);

[0059] ② Flexural strength: 5.8 MPa (GB / T17671-2021);

[0060] ③ Fire resistance rating: Class A (GB8624-2012);

[0061] ④ Thermal conductivity: 1.6 W / (m·K) (GB / T10294-2008);

[0062] ⑤ Water absorption rate: 7.2% (GB / T15229-2011);

[0063] ⑥ Joint sealing performance: After splicing, a water injection test was conducted, and there was no leakage after 24 hours (GB / T23451-2017).

[0064] (6) Installation instructions:

[0065] During construction, the tenons 2 of adjacent boards are inserted into the grooves 3 to ensure that the tenons 2 and the grooves 3 fit together; a rubber sealing strip is pre-placed in the sealing groove 4, and the sealing strip 5 is deformed under pressure after splicing to achieve waterproof sealing; the boards are fixed together by self-tapping screws 6 (passing through the screw holes reserved in the tenons), without the need for additional plastering, and can directly proceed to the subsequent decoration process. The installation efficiency can reach 15㎡ / person·day, which is much higher than that of traditional brick walls (5㎡ / person·day).

[0066] Example 2 (different from Example 1):

[0067] Preparation of industrial gypsum substrate layer:

[0068] ①Raw material ratio of industrial gypsum substrate layer: 60% desulfurized gypsum, 20% fluorogypsum, 15% neutralization residue modified powder, 2% sodium sulfate activator, water-to-material ratio 0.23;

[0069] ② Reinforcing layer: 120 mesh basalt fiber cloth (2 layers, 40mm spacing);

[0070] ③ Finished board dimensions: Length 3000mm, Width 600mm, Thickness 120mm.

[0071] Performance test results:

[0072] ① Compressive strength: 48MPa;

[0073] ② Flexural strength: 6.2 MPa;

[0074] ③ Thermal conductivity: 1.5 W / (m·K);

[0075] ④ Water absorption rate: 6.8%, all other properties meet the requirements.

[0076] 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 prefabricated building panel made using industrial gypsum, characterized in that, The prefabricated building panel (1) includes a reinforcing layer (11) along its thickness direction, and an industrial gypsum substrate layer (12) and a cement-based impermeable layer (13) arranged sequentially on both sides of the reinforcing layer (11), wherein: The reinforcing layer (11) is located in the middle of the prefabricated building panel (1) and is consistent with the length direction of the panel; The industrial gypsum substrate layer (12) is respectively disposed on the upper and lower sides of the reinforcing layer (11); The cement-based impermeable layer (13) is coated on the upper and lower outer surfaces of the industrial gypsum substrate layer (12); One end of the prefabricated building panel (1) is provided with a tenon (2), and the other end is provided with a groove (3) that matches the tenon (2). The prefabricated building panel (1) can be connected sequentially along its own length direction through the tenon (2) and the groove (3).

2. The prefabricated building panel according to claim 1, characterized in that, The reinforcing layer (11) is selected as a layer of glass fiber mesh or a layer of basalt fiber cloth, and is embedded between two industrial gypsum substrate layers (12); or, The reinforcing layer (11) is made of two layers of glass fiber mesh or two layers of basalt fiber cloth, and is laid evenly between two industrial gypsum substrate layers (12) along the thickness direction of the prefabricated building panel (1).

3. The prefabricated building panel according to claim 2, characterized in that, When the reinforcing layer (11) is made of glass fiber mesh embedded between two industrial gypsum substrate layers (12), the mesh count of the selected glass fiber mesh is 80 to 120.

4. The prefabricated building panel according to claim 1, characterized in that, The prefabricated building panel (1) has a thickness of 60mm to 120mm along its own thickness direction, wherein, The thickness of the cement-based impermeable layer (13) is 0.5 mm to 1 mm, and the thickness ratio of the industrial gypsum substrate layer (12) to the reinforcing layer (11) is 1.5 to 2.

5.

5. The prefabricated building panel according to claim 1, characterized in that, The cross-sectional shape of the tenon (2) is trapezoidal, and the top of the tenon (2) is narrower than its bottom end away from the prefabricated building panel (1). The shape of the groove (3) matches the tenon (2), and the tenon (2) on one of the prefabricated building panels (1) is embedded in the groove (3) of the adjacent prefabricated building panel (1).

6. The prefabricated building panel according to claim 5, characterized in that, A sealing groove (4) is provided on one side wall of the groove (3) of the prefabricated building panel (1). When two adjacent prefabricated building panels (1) are spliced ​​together, the sealing groove (4) can cooperate with the side wall of one end of the tenon (2) to form a sealed cavity. A sealing strip (5) is installed in the formed sealed cavity, and the outer contour of the selected sealing strip (5) matches the sealing groove (4).

7. The prefabricated building panel according to claim 6, characterized in that, The sealing groove (4) is provided in two parts, and the two sealing grooves (4) are symmetrically arranged on the left and right sides of the groove (3).

8. The prefabricated building panel according to claim 6, characterized in that, The sealing strip (5) is made of EPDM rubber.

9. The prefabricated building panel according to claim 6, characterized in that, Along the width direction of the prefabricated building panel (1), screw holes are provided on the tenon (2) and groove (3) of the prefabricated building panel (1) for passing through the tenon (2); Two adjacent assembled prefabricated building panels (1) can be fastened together by self-tapping screws (6) passing through screw holes.

Images