3D printing integrated forming process for building construction

Abstract

The invention relates to the technical field of building engineering, and discloses a building construction 3D printing integrated forming process which comprises the following steps: S1, generating a building three-dimensional model according to a design drawing of a building, and converting the three-dimensional model into a 3D printing file; s2, a 3D printing material suitable for the building structure is selected; s3, three-dimensional printing equipment is used for conducting layer-by-layer printing on all the printing areas of the building; s4, in the printing process, the printing temperature is controlled to range from 50 DEG C to 70 DEG C; s5, after printing is completed, a printed component is subjected to curing treatment, so that the final strength of the material meets the design requirement, and an anti-freezing and anti-thawing performance test is conducted; and S6, the printed component is subjected to later-stage surface treatment. By adopting the cement-based composite material and combining the optimal proportion of the polymer and the mineral admixture, the compressive strength, bending strength and bonding strength of the printing material can be remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of building engineering, and in particular to a 3D printing integrated molding process for building construction. Background Art

[0002] With the continuous development of the construction industry, 3D printing technology has been gradually applied to construction, especially in the printing of large buildings and complex structures. Existing 3D printing technology mainly relies on traditional cement-based materials or other composite materials to print building components, and completes the structure construction by stacking layer by layer. These methods control the path and material accumulation through 3D printers in order to obtain high-precision building components. Existing technologies are widely used in the production of small building structures, interior decoration and personalized building components, which improves design flexibility and construction efficiency, and can effectively reduce labor construction costs.

[0003] However, the existing technology still has some shortcomings, especially in terms of material performance. Many existing cement-based materials or composite materials fail to meet the requirements of large-scale buildings or complex environments in terms of structural strength and durability, especially in terms of compressive strength, flexural strength and interlayer bonding strength. This may cause cracks or deformation of components during use, thus affecting the overall safety and long-term stability of the building. Summary of the invention

[0004] The present invention aims to solve the above problems and thus provide an integrated 3D printing molding process for building construction.

[0005] The present invention solves the above-mentioned problem by adopting the following technical solution: The integrated molding process of 3D printing for building construction includes the following steps: S1. Generate a three-dimensional model of the building according to the design drawings of the building, and convert the three-dimensional model into a 3D printing file, wherein the three-dimensional model includes all structures and functional areas of the building, and the three-dimensional model can be subdivided into multiple printing areas, and different printing parameters are set for each printing area according to its functional requirements; S2. Select 3D printing materials suitable for building structures, wherein the printing materials have compressive strength, shrinkage rate, weather resistance, water resistance and environmental protection performance; S3, using a 3D printing device to print each printing area of ​​the building layer by layer; S4. During the printing process, the printing temperature is controlled within the range of 50℃ to 70℃ to ensure the best molding state of the material, and the printing accuracy is controlled by a real-time monitoring system during the printing process, with an error of no more than 0.1mm; S5. After printing is completed, the printed components are cured so that the final strength of the material meets the design requirements, and the freeze-thaw resistance test is performed to ensure that the material does not crack or break within the temperature range of -20°C to 60°C; S6. Performing post-surface treatment on the printed component, wherein the surface treatment includes cleaning, grinding and coating, and the surface finish reaches Ra3.2 or above.

[0006] Preferably, in step S2, the printing material is a cement-based composite material, the mass ratio of cement to polymer in the composite material is 7:3, and a mineral admixture is added.

[0007] Preferably, in the step S3, the printing device is a three-axis freedom printing device, which can move freely in three dimensions of XYZ, and the printing accuracy error of each printing area does not exceed 0.05mm.

[0008] Preferably, in the step S5, the curing treatment step includes placing the printed component in a temperature-controlled environment, maintaining the temperature in the range of 40° C. to 60° C., and the curing period is not less than 72 hours.

[0009] Preferably, in the step S3, a layered printing technique is used during the printing process, the printing speed does not exceed 5 m / h, the thickness of each layer of printed material is 0.8 mm to 1.5 mm, and the number of printed layers is automatically adjusted according to the complexity and size of the component.

[0010] Preferably, in the step S6, the coating used for the later surface treatment is an epoxy resin coating with a thickness of 0.3 mm to 0.5 mm and excellent waterproof and weather-resistant properties.

[0011] Preferably, in step S2, the compressive strength of the printed material is not less than 50 MPa, the flexural strength is not less than 15 MPa, and the bonding strength between each layer of material during the printing process is not less than 5 MPa.

[0012] Preferably, in the step S2, the materials in the printing area are distributed according to functional areas, and according to the load requirements of each area, the material ratio in the area includes 40% to 60% of cement-based composite materials, 20% to 30% of polymer additives and 10% to 20% of mineral admixtures.

[0013] Preferably, after the step S5, X-ray imaging technology is used to detect microcracks inside the component, and local heating repair is performed in the area where the microcracks are detected, so as to ensure the overall strength and defect-free state of the printed component.

[0014] Preferably, in the step S2, when selecting the printing material, the particle size distribution of the material is 0.1 mm to 0.3 mm, and the specific surface area of ​​the cement-based composite material is 400 m2 / kg to 600 m2 / kg.

[0015] Compared with the prior art, the present invention adopting the above technical solution has the following outstanding features: 1. The present invention adopts cement-based composite materials and combines the optimized ratio of polymer and mineral admixtures to significantly improve the compressive strength, flexural strength and bonding strength of printed materials.

[0016] 2. In the curing process of the present invention, the application of a temperature-controlled environment ensures uniform curing of the material. The temperature range is controlled between 40°C and 60°C, and the curing cycle can be optimized and adjusted according to the requirements of different components. The prior art usually lacks fine control over the curing temperature and cycle, which easily leads to uneven hardening or cracking of the components during the curing process. This innovation solves the problem of uneven curing and ensures the strength and durability of the printed components, especially under extreme climatic conditions, and performs better.

[0017] 3. After printing, the present invention uses epoxy resin coating for surface treatment. The thickness of the coating is controlled at 0.3mm to 0.5mm, and it has excellent waterproofness and weather resistance. Compared with the common surface treatment methods in the prior art, this process uses fine coating technology to not only improve the appearance quality of the components, but also improve the corrosion resistance and service life of the components. The epoxy resin coating is particularly suitable for buildings in complex environments, such as high humidity and high temperature areas, which further improves the durability of the buildings.

[0018] 4. The present invention uses X-ray imaging technology to detect microcracks inside components and performs local heating repair in the areas where microcracks are found. This technology solves the problem of difficulty in detecting internal defects of components in the prior art and can repair microcracks that may affect the strength of the structure during the construction process, thereby effectively extending the service life of the components and ensuring the integrity and safety of the building structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a flow chart of an embodiment of the present invention. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with embodiments, the purpose of which is only to provide a better understanding of the content of the present invention. Therefore, the examples given do not limit the protection scope of the present invention.

[0021] See also Figure 1 , the integrated molding process of 3D printing for building construction includes the following steps: S1. Generate a three-dimensional model of the building according to the design drawings of the building, and convert the three-dimensional model into a 3D printing file. The three-dimensional model includes all structures and functional areas of the building, and the three-dimensional model can be subdivided into multiple printing areas, and different printing parameters are set for each printing area according to its functional requirements; S2. Select 3D printing materials suitable for building structures. The printing materials have compressive strength, shrinkage rate, weather resistance, water resistance and environmental protection performance; S3, using a 3D printing device to print each printing area of ​​the building layer by layer; S4. During the printing process, the printing temperature is controlled within the range of 50℃ to 70℃ to ensure the best molding state of the material, and the printing accuracy is controlled by a real-time monitoring system during the printing process, with an error of no more than 0.1mm; S5. After printing is completed, the printed components are cured so that the final strength of the material meets the design requirements, and the freeze-thaw resistance test is performed to ensure that the material does not crack or break within the temperature range of -20°C to 60°C; S6. Perform post-surface treatment on the printed components, including cleaning, grinding and coating, and the surface finish reaches Ra3.2 or above.

[0022] Specifically, the present invention can significantly improve the compressive strength, flexural strength and bonding strength of printed materials by adopting cement-based composite materials and combining them with an optimized ratio of polymers and mineral admixtures. This innovative material ratio not only improves the strength and durability of the components, but also effectively reduces the risk of shrinkage and cracking of the materials, and solves the problem in the prior art that materials are susceptible to environmental changes. Therefore, this process can provide more reliable support in complex and large-scale building structures and improve the long-term stability of the buildings.

[0023] In step S2, the printing material is a cement-based composite material, the mass ratio of cement to polymer in the composite material is 7:3, and mineral admixtures are added.

[0024] In step S2, the compressive strength of the printed material is not less than 50 MPa, the flexural strength is not less than 15 MPa, and the bonding strength between each layer of material during the printing process is not less than 5 MPa.

[0025] Specifically, the printing material is a cement-based composite material, which is a mixture of cement, polymer and mineral admixture in a mass ratio of 7:3:(5 to 20). Specifically, the cement-based composite material contains cement (such as ordinary Portland cement), polymer (such as acrylic acid or polyvinyl alcohol) and mineral admixture (such as fly ash or slag). The main function of cement is to provide strength and rigidity, polymer improves the adhesion and flexibility of the material, and mineral admixture helps to reduce the shrinkage of the material and optimize the workability and durability of the material. After adding polymer and mineral admixture, the compressive strength of the composite material is not less than 50MPa, the flexural strength is not less than 15MPa, and the bonding strength between each layer of material is not less than 5MPa, ensuring the strength, stability and durability of the component. The selected particle size distribution is 0.1mm to 0.3mm. Materials with finer particle sizes can improve mixing uniformity and bonding between printing layers, thereby enhancing printing quality. The specific surface area of ​​cement-based composite materials is 400㎡ / kg to 600㎡ / kg. This parameter makes the material highly reactive, can better react with water, enhance the structural strength after molding, and improve the fluidity of the material, so as to adapt to the complex paths and detail processing in the 3D printing process. This composite material has good resistance to freeze-thaw, acid and alkali corrosion, adapts to various environmental conditions, and ensures long-term use and durability during construction.

[0026] In step S3, the printing device is a three-axis freedom printing device that can move freely in three dimensions of XYZ, and the printing accuracy error of each printing area does not exceed 0.05mm.

[0027] Specifically, the printing device is a three-dimensional printer with three-axis freedom, which can move freely in three dimensions of XYZ. The device adopts a high-precision control system to ensure that the printing accuracy error of each printing area does not exceed 0.05mm. This accuracy ensures that when performing 3D printing for construction, the details and complexity of each component can be effectively presented, and the shape and size of the entire building or component meet the design requirements. The printing device with three-axis freedom has high flexibility and accuracy and is suitable for printing large and complex structures. Through computer-controlled precision adjustment, detailed printing work can be completed efficiently, errors can be reduced, production efficiency can be improved, and scrap rates can be reduced.

[0028] In step S5, the curing treatment step includes placing the printed component in a temperature-controlled environment, maintaining the temperature in the range of 40° C. to 60° C., and the curing cycle is not less than 72 hours.

[0029] Specifically, in the curing process, the printed components will be placed in a temperature-controlled environment, the temperature will be maintained in the range of 40°C to 60°C, and the curing cycle will be 72 hours. This temperature-controlled environment promotes the hydration reaction in cement-based composite materials by precisely controlling the temperature, so that the material forms a stronger structure during the curing process, improving the compressive strength and durability. The choice of curing time ensures the gradual strength increase of the material and avoids cracks or deformation caused by rapid curing. In addition, a stable curing process can effectively improve the thermal expansion and freeze-thaw resistance of the components, ensuring that they can be used stably under different climatic conditions. The use of such a curing treatment can ensure the high performance of the components in actual use and prevent physical damage in the later stage.

[0030] In step S3, a layered printing technique is used during the printing process. The printing speed does not exceed 5m / h. The thickness of each layer of printing material is 0.8mm to 1.5mm. The number of printing layers is automatically adjusted according to the complexity and size of the component.

[0031] Specifically, during the printing process, layered printing technology is used, and the thickness of each layer of printed material is 0.8mm to 1.5mm. Layered printing can carefully control the molding of each layer and improve the stability of the structure and the interlayer adhesion. The printing speed is controlled within 5m / h to ensure the stability and accuracy of each layer, and avoid poor interlayer adhesion or rough surface caused by rapid printing. According to the complexity and size of the component, the number of printed layers will be dynamically adjusted to meet the design requirements of different components. The use of layered technology can not only improve the molding accuracy, but also effectively control the amount of material used and the printing quality, and optimize the construction efficiency.

[0032] In step S6, the coating used for the later surface treatment is an epoxy resin coating with a thickness of 0.3 mm to 0.5 mm and excellent waterproof and weather-resistant properties.

[0033] Specifically, after printing is completed, post-surface treatment is performed. The coating used is an epoxy resin coating with a coating thickness of 0.3mm to 0.5mm. The epoxy resin coating has excellent waterproof properties and can effectively prevent moisture from entering the component, avoiding the reduction of material strength or corrosion due to a humid environment. At the same time, the epoxy resin coating has good weather resistance and can resist ultraviolet radiation, temperature changes and chemical erosion, thereby extending the service life of the component. By performing surface coating treatment on the printed component, not only the aesthetics of the component is improved, but also the environmental adaptability of the component is enhanced, ensuring that it can be used stably for a long time.

[0034] In step S2, the materials in the printing area are distributed according to functional areas, and according to the load requirements of each area, the material ratio in the area includes 40% to 60% cement-based composite materials, 20% to 30% polymer additives and 10% to 20% mineral admixtures.

[0035] Specifically, in step S2, the materials in the printing area are distributed according to the functional areas, and the material ratio is adjusted according to the load requirements of each area. The material ratio is 40% to 60% cement-based composite materials, 20% to 30% polymer additives, and 10% to 20% mineral admixtures. According to the design requirements and load requirements of different areas, the material ratio of different functional areas is adjusted to ensure the structural strength and stability of each area. By scientifically allocating material ratios to ensure the printing quality and performance of each area, while meeting the requirements of building structural mechanics, it can also reduce material waste and improve cost-effectiveness.

[0036] After step S5, X-ray imaging technology is used to detect microcracks inside the component, and local heating repair is performed in the area where the microcracks are detected, so that the overall strength and defect-free state of the printed component are maintained.

[0037] Specifically, after the curing treatment, X-ray imaging technology is used to detect microcracks in the components. X-ray imaging technology can non-destructively detect microcracks and voids inside the components, avoiding structural damage caused by microcracks in subsequent construction. If microcracks are found during the inspection process, local heating repair will be carried out in the area, and heat treatment methods will be used to fully bond the materials at the cracks, eliminate internal stress, and restore the overall strength of the materials. This method can effectively prevent the strength loss caused by microcracks and ensure the overall performance and defect-free state of the components.

[0038] In step S2, when selecting the printing material, the particle size distribution of the material is 0.1 mm to 0.3 mm, and the specific surface area of ​​the cement-based composite material is 400 m2 / kg to 600 m2 / kg.

[0039] Specifically, when selecting printing materials, the particle size distribution of cement-based composite materials is controlled at 0.1mm to 0.3mm, and the specific surface area of ​​cement-based composite materials is 400㎡ / kg to 600㎡ / kg. Materials with smaller particle sizes can improve their mixing effect with cement, polymers and mineral admixtures, and improve the uniformity and operability of the materials. In addition, a larger specific surface area can increase the reactivity of the material, help the hydration reaction of cement, and improve its early strength. The fluidity and adhesion of the material are also enhanced, thereby ensuring good printing effects and component strength during 3D printing.

[0040] The following is an introduction in conjunction with specific embodiments: Example

[0041] In this embodiment, the following technical parameters and materials are used: Printing materials: Cement-based composite materials, the mass ratio of cement to polymer is 7:3, and 15% of mineral admixtures are added. The particle size distribution of the material is 0.1mm to 0.2mm, and the specific surface area is 600㎡ / kg.

[0042] Compressive strength: not less than 80MPa.

[0043] Flexural strength: not less than 30MPa.

[0044] Printing equipment: 3-axis freedom printing equipment, printing accuracy error does not exceed 0.02mm.

[0045] Curing treatment: The curing temperature is maintained in the range of 50℃ to 60℃, and the curing cycle is 96 hours.

[0046] Post-surface treatment: The coating is epoxy resin coating with a coating thickness of 0.5mm, which is extremely waterproof and weather-resistant.

[0047] The application of this embodiment is suitable for large-scale construction projects with high requirements for structural strength, such as high-rise buildings or bridges, to ensure long-term stability in harsh environments. Example

[0048] In this embodiment, the following technical parameters and materials are used: Printing materials: Cement-based composite materials, the mass ratio of cement to polymer is 7:3, and 10% of mineral admixtures are added. The particle size distribution of the material is 0.1mm to 0.3mm, and the specific surface area is 500㎡ / kg.

[0049] Compressive strength: not less than 65MPa.

[0050] Flexural strength: not less than 20MPa.

[0051] Printing equipment: 3-axis freedom printing equipment, printing accuracy error does not exceed 0.05mm.

[0052] Curing treatment: The curing temperature is maintained in the range of 40℃ to 50℃, and the curing cycle is 72 hours.

[0053] Post-surface treatment: The coating is epoxy resin coating with a coating thickness of 0.4mm, which has good waterproof and weather resistance.

[0054] This embodiment is suitable for medium-sized construction projects, especially more complex interior components or small commercial buildings, and can optimize costs and construction time while ensuring structural strength. Example

[0055] In this embodiment, the following technical parameters and materials are used: Printing materials: Cement-based composite materials, the mass ratio of cement to polymer is 7:3, and 5% of mineral admixtures are added. The particle size distribution of the material is 0.2mm to 0.3mm, and the specific surface area is 400㎡ / kg.

[0056] Compressive strength: not less than 50MPa.

[0057] Flexural strength: not less than 15MPa.

[0058] Printing equipment: 3-axis freedom printing equipment, printing accuracy error does not exceed 0.1mm.

[0059] Curing treatment: The curing temperature is maintained in the range of 40℃ to 50℃, and the curing cycle is 48 hours.

[0060] Post-surface treatment: The coating is epoxy resin coating with a coating thickness of 0.3mm, which has basic waterproof and weather resistance.

[0061] This embodiment is suitable for smaller-scale construction projects or fast-building projects, such as the outer walls of residential areas, etc., and the focus is on improving construction efficiency and controlling costs.

[0062] Table 1: Comparison of properties between the embodiment and the prior art The following is an explanation of each character in the table: Waterproofness: Indicates the ability of a material to resist water penetration under different environmental conditions, and is divided into several levels: "average", "good", "excellent" and "basic".

[0063] Normal: The material has poor water barrier properties and is easily eroded by moisture.

[0064] Good: The material has some water resistance, but may have problems in prolonged water immersion or high humidity environments.

[0065] Excellent: The material has strong waterproof ability and can maintain its performance in an environment with long-term contact with water.

[0066] Basic: The material has weak water resistance and is suitable for dry environments.

[0067] Weatherability: Indicates the stability of a material under long-term exposure to weather changes, UV radiation and temperature changes.

[0068] General: The material has poor adaptability to the external environment and is easily affected by weather changes, and may experience problems such as fading and cracking.

[0069] Good: The material has a certain degree of weather resistance, can adapt to normal environmental changes, and is relatively stable.

[0070] Excellent: The material has strong resistance to changes in the external environment and can maintain stable performance for a long time.

[0071] Compressive Strength (MPa): Indicates the maximum bearing capacity of a material under compressive load, measured in megapascals (MPa). The higher the value, the stronger the compressive strength of the material.

[0072] 50-60MPa: compressive strength of ordinary materials.

[0073] 80MPa: Compressive strength with the highest data, indicating an extremely strong material.

[0074] 65MPa: Medium strength material.

[0075] 50MPa: Material with the lowest strength.

[0076] Bending strength (MPa): Indicates the ability of a material to resist bending deformation, measured in megapascals (MPa). The higher the bending strength, the greater the bending moment the material can withstand.

[0077] 15-20MPa: flexural strength of common materials.

[0078] 30MPa: The highest bending strength, indicating strong bending resistance.

[0079] 20MPa: Medium strength bending resistance.

[0080] 15MPa: minimum strength of bending resistance.

[0081] Thermal conductivity (W / m·K): Indicates the ability of a material to conduct heat, measured in watts per meter per Kelvin (W / m·K). Materials with lower thermal conductivity have better thermal insulation properties.

[0082] 0.7W / m·K: Thermal conductivity of common materials.

[0083] 0.8W / m·K: The highest thermal conductivity, indicating higher thermal insulation performance.

[0084] 0.75W / m·K: Medium thermal conductivity material.

[0085] 0.72W / m·K: Material with the lowest thermal conductivity.

[0086] Shrinkage (%): Indicates the volume shrinkage percentage of the material during the curing process. Materials with lower shrinkage have better stability.

[0087] 0.5%: Shrinkage rate of common materials.

[0088] 0.3%: The highest shrinkage rate, the material stability is higher.

[0089] 0.4%: Medium shrinkage material.

[0090] 0.6%: Minimum stable shrinkage rate.

[0091] The present invention adopts cement-based composite materials and combines the optimized ratio of polymer and mineral admixtures to significantly improve the compressive strength, flexural strength and bonding strength of the printed material.

[0092] During the curing process, the application of a temperature-controlled environment ensures uniform curing of the material. The temperature range is controlled between 40°C and 60°C, and the curing cycle can be optimized and adjusted according to the requirements of different components. Existing technologies usually lack fine control over curing temperature and cycle, which can easily lead to uneven hardening or cracking of components during the curing process. This innovation solves the problem of uneven curing and ensures the strength and durability of printed components, especially under extreme climatic conditions.

[0093] After printing is completed, epoxy resin coating is used for surface treatment. The thickness of the coating is controlled at 0.3mm to 0.5mm, and it has excellent waterproofness and weather resistance. Compared with the common surface treatment methods in the prior art, this process uses fine coating technology to not only improve the appearance quality of the components, but also improve the corrosion resistance and service life of the components. Epoxy resin coating is particularly suitable for buildings in complex environments, such as high humidity and high temperature areas, which further improves the durability of the buildings.

[0094] X-ray imaging technology is used to detect microcracks inside components, and local heating repairs are performed in the areas where microcracks are found. This technology solves the problem of difficulty in detecting internal defects of components in existing technologies. Microcracks that may affect the strength of the structure can be repaired during the construction process, thereby effectively extending the service life of the components and ensuring the integrity and safety of the building structure.

[0095] The above description is only a preferred feasible embodiment of the present invention, and does not limit the scope of rights of the present invention. All equivalent changes made using the contents of the present specification and its drawings are included in the scope of rights of the present invention.

Claims

1. A 3D printing integrated molding process for building construction, characterized in that: The following steps are involved: S1. Generate a three-dimensional model of the building according to the design drawings of the building, and convert the three-dimensional model into a 3D printing file, wherein the three-dimensional model includes all structures and functional areas of the building, and the three-dimensional model can be subdivided into multiple printing areas, and different printing parameters are set for each printing area according to its functional requirements; S2. Select 3D printing materials suitable for building structures, wherein the printing materials have compressive strength, shrinkage rate, weather resistance, water resistance and environmental protection performance; S3, using a 3D printing device to print each printing area of ​​the building layer by layer; S4. During the printing process, the printing temperature is controlled within the range of 50℃ to 70℃ to ensure the best molding state of the material, and the printing accuracy is controlled by a real-time monitoring system during the printing process, with an error of no more than 0.1mm; S5. After printing is completed, the printed components are cured so that the final strength of the material meets the design requirements, and the freeze-thaw resistance test is performed to ensure that the material does not crack or break within the temperature range of -20°C to 60°C; S6. Performing post-surface treatment on the printed component, wherein the surface treatment includes cleaning, grinding and coating, and the surface finish reaches Ra3.2 or above.

2. The integrated 3D printing process for building construction according to claim 1 is characterized in that: In the step S2, the printing material is a cement-based composite material, the mass ratio of cement to polymer in the composite material is 7:3, and a mineral admixture is added.

3. The integrated 3D printing process for building construction according to claim 1 is characterized in that: In the step S3, the printing device is a three-axis freedom printing device that can move freely in three dimensions of XYZ, and the printing accuracy error of each printing area does not exceed 0.05mm.

4. The building construction 3D printing integrated molding process according to claim 1 is characterized in that: In the step S5, the curing treatment step includes placing the printed component in a temperature-controlled environment, maintaining the temperature in the range of 40° C. to 60° C., and the curing period is not less than 72 hours.

5. The building construction 3D printing integrated molding process according to claim 1 is characterized in that: In the step S3, a layered printing technique is used in the printing process, the printing speed does not exceed 5 m / h, the thickness of each layer of printing material is 0.8 mm to 1.5 mm, and the number of printing layers is automatically adjusted according to the complexity and size of the component.

6. The building construction 3D printing integrated molding process according to claim 1 is characterized in that: In the step S6, the coating used for the later surface treatment is an epoxy resin coating with a thickness of 0.3 mm to 0.5 mm and excellent waterproof and weather-resistant properties.

7. The building construction 3D printing integrated molding process according to claim 1 is characterized in that: In the step S2, the compressive strength of the printed material is not less than 50 MPa, the flexural strength is not less than 15 MPa, and the bonding strength between each layer of material during the printing process is not less than 5 MPa.

8. The building construction 3D printing integrated molding process according to claim 1 is characterized in that: In the step S2, the materials in the printing area are distributed according to the functional areas, and according to the load requirements of each area, the material ratio in the area includes 40% to 60% of cement-based composite materials, 20% to 30% of polymer additives and 10% to 20% of mineral admixtures.

9. The building construction 3D printing integrated molding process according to claim 1, characterized in that: After the step S5, X-ray imaging technology is used to detect microcracks inside the component, and local heating repair is performed in the area where the microcracks are detected, so that the overall strength of the printed component is maintained and there is no defect.

10. The building construction 3D printing integrated molding process according to claim 2, characterized in that: In the step S2, when selecting the printing material, the particle size distribution of the material is 0.1 mm to 0.3 mm, and the specific surface area of ​​the cement-based composite material is 400 m2 / kg to 600 m2 / kg.

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