Fabricated composite heat preservation outer formwork based on BIM technology and construction method

Abstract

The invention relates to an assembly type composite heat preservation outer formwork based on a BIM technology and a construction method. The assembly type composite heat preservation outer formwork sequentially comprises a heat preservation layer, a structure reinforcing layer, a waterproof layer and a facing layer from inside to outside. Fixing mechanisms are installed between the layers, mechanical interlocking is achieved through the fixing mechanisms, a BIM model is adopted for conducting three-dimensional parameterization design, a node detailed drawing is automatically generated, the fixing mechanisms comprise installation screw holes formed in the layers, installation screws are in threaded connection with the interiors of inner cavities of the installation screw holes, and clamping blocks are installed on the back faces of the installation screws. Through the design of the fixing mechanism, a mechanical interlocking structure, a mounting screw rod, a clamping block and a fixing screw rod, all layers are tightly fixed, compared with traditional connecting pieces such as bolts and anchor bolts, disassembly is easier and more convenient, formworks and heat preservation materials are not prone to being damaged, the construction cost and the maintenance cost are remarkably reduced, and the construction efficiency is improved. Due to the design of the mechanical interlocking structure, the overall stability of the formwork is enhanced, and the repeated utilization rate of the formwork is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal insulation exterior formwork, and in particular to an assembled composite thermal insulation exterior formwork and a construction method based on BIM technology. Background Art

[0002] With the continuous development of the construction industry, green and energy-saving buildings have become an important trend of current development. As a new type of green building material, prefabricated composite insulation exterior wall panels have been widely used in prefabricated buildings due to their mature technology, light weight, high strength, energy saving and environmental protection, fireproof and sound insulation.

[0003] After searching, the Chinese patent number CN212200830U discloses that the utility model relates to an assembled composite thermal insulation outer formwork, including an insulation layer, the insulation layer is bonded to an adhesive reinforcement layer 1 on the inner side of the insulation layer, and the adhesive layer is bonded to the outer side of the insulation layer, the outer side of the adhesive layer is bonded with an insulation transition layer, the outer side of the insulation transition layer is bonded with an adhesive reinforcement layer 2, and the adhesive layer, the insulation layer and the adhesive reinforcement layer 1 are penetrated by reinforcing anchors. The beneficial effects of the utility model are: easy installation and use, saving a lot of manpower and material resources, the overall structural firmness is strong, and by providing a downward inclined anchor section, it can fit tightly and fix to the outer wall of the building and will not detach from the outer wall.

[0004] However, the existing assembled composite insulation outer formwork is often fixed with connectors such as bolts and anchors. These connectors are not only cumbersome to install, but also easy to damage the formwork and insulation materials during disassembly, resulting in low construction efficiency and increased material and maintenance costs. Based on this, the present invention designs an assembled composite insulation outer formwork and a construction method based on BIM technology to solve the above problems. Summary of the invention

[0005] 1. Technical issues to be resolved In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides an assembled composite thermal insulation exterior formwork and a construction method based on BIM technology, which solves the technical problem that it cannot be disassembled.

[0006] (II) Technical solution In order to achieve the above object, the main technical solutions adopted by the present invention include: An assembled composite thermal insulation exterior formwork based on BIM technology, comprising from inside to outside: Insulation layer: closed-cell graphite polystyrene foam board with apparent density ≥25kg / m³ and thermal conductivity ≤0.032W / (m·K), with a concave-convex tooth-groove structure with a spacing of ≤300mm on the outside.

[0007] Structural reinforcement layer: It is composed of a galvanized steel wire mesh with a diameter of 1.2-1.5mm and a fiber-reinforced cement-based composite material with a thickness of 8-12mm, with a tensile strength of ≥8MPa.

[0008] Waterproof layer: Use polymer modified cement-based waterproof coating with a coating amount of 1.5-2.0kg / m² to form a continuous film layer with a thickness of ≥1.2mm and a bonding strength with the insulation layer of ≥0.25MPa.

[0009] Finishing layer: Use stone-like fluorocarbon coating system, dry film thickness ≥80μm, resistance to artificial weathering aging ≥3000h.

[0010] A fixing mechanism is installed between each layer and mechanical interlocking is achieved through the fixing mechanism. The BIM model is used for three-dimensional parametric design to automatically generate node details. The fixing mechanism includes mounting screw holes opened on each layer, and a mounting screw is threadedly connected in the inner cavity of the mounting screw hole, and a card block is installed on the back of the mounting screw.

[0011] Preferably, the thermal insulation layer includes a protective frame, in which a foam board body is installed and is used for the thermal insulation of the entire outer formwork; the structural reinforcement layer includes a galvanized steel wire mesh body, which is distributed and installed on the front and back sides of the thermal insulation layer and enhances the strength of the outer formwork; the waterproof layer includes a continuous membrane layer body, which covers the front and back sides of the structural reinforcement layer and plays a waterproof role.

[0012] Preferably, the finishing layer includes a stone-like paint layer, which is distributed on the front and back sides of the waterproof layer and has durability; the outer formwork also includes a sealing layer, which is located on the outer walls of the thermal insulation layer, the structural reinforcement layer, the waterproof layer and the finishing layer and is used for filling the outer formwork.

[0013] Preferably, a card slot is provided inside the mounting screw hole of the stone-like paint layer located on the back side, and the card block can rotate inside the card slot to achieve the fixing effect between the layers. A mounting plate is installed on the front side of the mounting screw, and a fixing screw hole is provided between the mounting plate and the front side of the stone-like paint layer located on the front side, and a fixing screw is threadedly connected in the inner cavity of the fixing screw hole.

[0014] Preferably, a construction method of an assembled composite thermal insulation outer formwork based on BIM technology is provided to produce the outer formwork, and the construction method comprises the following steps: Step S1, BIM model establishment and design optimization, using BIM software to establish a three-dimensional model of the external formwork, including detailed parameters of the insulation layer, structural reinforcement layer, waterproof layer, finishing layer and fixing mechanism; Step S2, factory prefabrication, the list generated by the BIM model, and the prefabrication of each layer of materials in the factory to ensure that the dimensional accuracy and material performance of each layer meet the design requirements; Step S3, virtual assembly and error analysis: after the panel is manufactured, the required assembly components are scanned one by one to obtain three-dimensional data, and virtual assembly is performed through BIM software to analyze errors and make adjustments; Step S4, on-site installation, transporting the prefabricated outer formwork to the construction site and accurately installing it according to the construction simulation of the BIM model; Step S5, fixing and sealing processing, the layers are mechanically interlocked by a fixing mechanism, the mounting screws pass through the mounting screw holes of each layer, and are fixed with a clamping block to ensure that the layers are tightly combined; Step S6, finishing construction, constructing a finishing layer on the outside of the waterproof layer, using a stone-like fluorocarbon coating system with a dry film thickness of ≥80 μm to ensure the durability and aesthetics of the finishing layer; Step S7, quality acceptance and monitoring, uses BIM technology to conduct real-time monitoring and quality acceptance of the construction process to ensure that the construction quality meets the design requirements.

[0015] Preferably, a transition interface agent layer is provided between the thermal insulation layer and the structural reinforcement layer, using an epoxy resin-based interface agent with a coating amount ≥ 0.3kg / m² and a bonding strength ≥ 1.0MPa to enhance the bonding force between the thermal insulation layer and the structural reinforcement layer.

[0016] Preferably, before the construction of the finishing layer, the color and texture simulation is carried out through BIM technology to ensure the coordination between the finishing layer and the overall style of the building; during the construction process, an intelligent construction quality and safety control method is adopted to monitor the construction quality in real time to ensure construction safety.

[0017] Preferably, the positioning method for on-site installation in step S4 is: using a total station and a BIM model for linkage positioning, with a horizontal positioning error of ≤2mm and a verticality deviation of ≤1 / 1000; a gap between the template and the main structure of ≤3mm, and the out-of-tolerance parts are filled with a polyurethane foaming agent with a foaming density of ≥35kg / m³ and a compression strength of ≥150kPa.

[0018] Preferably, after the construction of the finishing layer in step S6, the following needs to be carried out: UV accelerated aging test, gloss retention rate ≥ 80% after 3000h; stain resistance test, reflectivity reduction rate ≤ 15%.

[0019] Preferably, the quality acceptance criteria in step S7 include: the on-site inspection value of the thermal conductivity of the insulation layer is ≤0.035W / (m·K), and the hollowing rate detected by infrared thermal imaging is ≤3%; the waterproof layer is detected by negative pressure method, and the negative pressure value of -500Pa is maintained for 10 minutes without leakage; the color difference of the finishing layer ΔE is ≤1.5, and the adhesion test cross-cutting method level is ≥1.

[0020] (III) Beneficial effects 1. The present invention adopts a mechanical interlocking structure through the design of a fixing mechanism, and realizes tight fixation between layers by installing screws, blocks and fixing screws. Compared with traditional connectors such as bolts and anchors, the disassembly is easier and the formwork and insulation materials are not easily damaged, which significantly reduces the construction cost and maintenance cost. The design of the mechanical interlocking structure also enhances the overall stability of the formwork and improves the reuse rate of the formwork.

[0021] 2. The present invention adopts closed-cell graphite polystyrene foam board in the thermal insulation layer, which has excellent thermal insulation performance. At the same time, combined with the concave-convex tooth-groove structure design, the contact area and bonding force with the structural reinforcement layer are increased, further improving the thermal insulation effect.

[0022] 3. The present invention adopts polymer-modified cement-based waterproof coating in the waterproof layer, which has high bonding strength with the thermal insulation layer to form a continuous waterproof film layer, effectively preventing moisture from penetrating into the thermal insulation layer and extending the service life of the template. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the assembled composite thermal insulation outer formwork and the construction method based on BIM technology of the present invention; Figure 2 for Figure 1 A magnified image of point A; Figure 3 A side view of the assembled composite thermal insulation outer formwork and the construction method based on BIM technology of the present invention; Figure 4 for Figure 3 A magnified view of point B; Figure 5 It is a schematic structural diagram of the thermal insulation layer of the present invention; Figure 6 It is a structural schematic diagram of the finishing layer and the fixing mechanism of the present invention; Figure 7 for Figure 6 Enlarged view of point C; Figure 8 This is a structural example diagram of the assembled composite thermal insulation exterior formwork and construction method based on BIM technology of the present invention.

[0024] [Description of Reference Numerals] 1. Insulation layer; 101. Protection frame; 102. Foam board body; 2. Structural reinforcement layer; 201. Galvanized steel mesh body; 3. Waterproof layer; 301. Continuous membrane layer body; 4. Finishing layer; 401. Imitation stone paint layer; 5. Fixing mechanism; 501. Mounting screw hole; 502. Mounting screw; 503. Block; 504. Slot; 505. Mounting sheet; 506. Fixing screw hole; 507. Fixing screw; 6. Sealing layer. DETAILED DESCRIPTION

[0025] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below in conjunction with the accompanying drawings through specific embodiments. Figure 1 The orientation is used as a reference.

[0026] The technical problem of being unable to disassemble is solved by the embodiment of the present invention. The fixing mechanism 5 is designed and a mechanical interlocking structure is adopted. The tight fixation between the layers is achieved by installing the screw 502, the block and the fixing screw 507. Compared with traditional bolts, anchor bolts and other connecting parts, the disassembly is easier and less likely to damage the formwork and insulation materials, which significantly reduces the construction cost and maintenance cost. The design of the mechanical interlocking structure also enhances the overall stability of the formwork and improves the reuse rate of the formwork.

[0027] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0028] Embodiment 1; See also Figure 1-Figure 8In the embodiment of the present invention, an assembled composite insulation outer formwork based on BIM technology comprises, from inside to outside, the following: insulation layer 1: a closed-cell graphite polystyrene foam board with an apparent density of ≥25kg / m³ and a thermal conductivity of ≤0.032W / (m·K), with a concave-convex tooth-groove structure with a spacing of ≤300mm arranged on its outer side; structural reinforcement layer 2: a composite of a galvanized steel wire mesh with a diameter of 1.2-1.5mm and a fiber-reinforced cement-based composite material with a thickness of 8-12mm, with a tensile strength of ≥8MPa; waterproof layer 3: a polymer-modified cement-based waterproof coating with a coating amount of 1.5-2.0kg / m², shaped A continuous film layer with a thickness of ≥1.2mm is formed, and the bonding strength with the insulation layer 1 is ≥0.25MPa; the finishing layer 4: a fluorocarbon coating system with a stone-like texture is selected, the dry film thickness is ≥80μm, and the resistance to artificial weathering aging is ≥3000h; a fixing mechanism 5 is installed between each layer and mechanical interlocking is achieved through the fixing mechanism 5, and a BIM model is used for three-dimensional parametric design, and node details are automatically generated. The fixing mechanism 5 includes a mounting screw hole 501 opened in each layer, and a mounting screw 502 is threadedly connected in the inner cavity of the mounting screw hole 501, and a block 503 is installed on the back of the mounting screw 502.

[0029] The insulation layer 1 includes a protective frame 101, and a foam board body 102 is installed inside the protective frame 101 and is used for the insulation of the outer template as a whole; the structural reinforcement layer 2 includes a galvanized steel mesh body 201, which is distributed and installed on the front and back of the insulation layer 1 and enhances the strength of the outer template; the waterproof layer 3 includes a continuous film layer body 301, which covers the front and back of the structural reinforcement layer 2 and plays a waterproof role. The finishing layer 4 includes a stone-like paint layer 401, which is distributed on the front and back of the waterproof layer 3 and plays a role in durability; the outer template also includes a sealing layer 6, which is located on the outer wall of the insulation layer 1, the structural reinforcement layer 2, the waterproof layer 3 and the finishing layer 4 and is used for filling the outer template. A card slot 504 is provided inside the mounting screw hole 501 of the stone-like paint layer 401 located on the back side, and the card block 503 can rotate inside the card slot 504 to achieve the fixing effect between the layers. A mounting plate 505 is installed on the front side of the mounting screw 502. The mounting plate 505 and the front side of the stone-like paint layer 401 located on the front side are provided with a fixing screw hole 506, and a fixing screw 507 is threadedly connected in the inner cavity of the fixing screw hole 506.

[0030] The working principle of the embodiment of the present invention is: the insulation layer 1 adopts a closed-cell graphite polystyrene foam board, whose apparent density is ≥25kg / m³ and thermal conductivity is ≤0.032W / (m·K), which can effectively block heat conduction and reduce indoor and outdoor heat exchange, thereby achieving energy-saving and heat preservation effects. The insulation layer 1 includes a protective frame 101, and a foam board body 102 is installed inside the protective frame 101 for the insulation of the entire outer template. A concave-convex tooth groove structure with a spacing of ≤300mm is arranged on its outer side, which increases the contact area and bonding force with the structural reinforcement layer 2. The structural reinforcement layer 2 is composed of a galvanized steel wire mesh body 201 with a diameter of 1.2-1.5mm and a fiber-reinforced cement-based composite material with a thickness of 8-12mm, and the tensile strength is ≥8MPa. The galvanized steel wire mesh body 201 is distributed and installed on the front and back of the insulation layer 1 to form a solid grid structure, which can effectively disperse and withstand external forces and enhance the structural strength of the entire outer template.

[0031] The waterproof layer 3 adopts a polymer-modified cement-based waterproof coating with a coating amount of 1.5-2.0kg / m² to form a continuous film body 301 with a thickness of ≥1.2mm. This waterproof coating has excellent bonding properties, and the bonding strength with the thermal insulation layer 1 is ≥0.25MPa, which can ensure that the waterproof layer 3 is closely combined with the thermal insulation layer 1 to form a whole, play a waterproof role, effectively prevent moisture from penetrating into the thermal insulation layer 1, and prevent the thermal insulation layer 1 from reducing the thermal insulation performance due to water absorption. The finishing layer 4 uses a stone-like texture fluorocarbon coating system with a dry film thickness of ≥80μm and resistance to artificial weathering aging of ≥3000h. This coating system not only has good durability and anti-aging properties, but also can provide rich colors and textures to meet the requirements of building appearance design. The finishing layer 4 includes a stone-like coating layer 401, which is distributed on the front and back of the waterproof layer 3, playing a role of durability and aesthetics.

[0032] Mechanical interlocking is achieved between each layer through a fixing mechanism 5 to ensure that each layer is tightly combined to form a whole. The fixing mechanism 5 includes a mounting screw hole 501 provided in each layer, a mounting screw rod 502 is threadedly connected in the inner cavity of the mounting screw hole 501, and a clamping block 503 is installed on the back of the mounting screw rod 502. A clamping groove 504 is provided inside the mounting screw hole 501 of the imitation stone coating layer 401 located at the back, and the clamping block 503 can rotate inside the clamping groove 504 to achieve the fixing effect between each layer. A mounting sheet 505 is installed on the front side of the mounting screw rod 502, and a fixing screw hole 506 is provided on the mounting sheet 505 and the front side of the imitation stone coating layer 401 located at the front, and a fixing screw rod 507 is threadedly connected in the inner cavity of the fixing screw hole 506. This mechanical interlocking structure not only ensures the tight combination between each layer, but also can effectively disperse and withstand external forces, thereby improving the structural stability of the entire outer template.

[0033] The outer formwork also includes a sealing layer 6, which is located on the outer wall of the thermal insulation layer 1, the structural reinforcement layer 2, the waterproof layer 3 and the finishing layer 4, and is used to fill the outer formwork. The sealing layer 6 adopts a high-performance sealing material, which has good adhesion, elasticity and durability, and can effectively fill the gap between the formwork and the building structure to prevent air and moisture from penetrating and ensure the thermal insulation effect. Through the synergistic effect of the above-mentioned layers of structure, the assembled composite thermal insulation outer formwork of the present invention not only realizes efficient thermal insulation, waterproofing, structural reinforcement and aesthetic functions, but also realizes intelligent management of design, construction and quality control through BIM technology, ensuring the efficiency of construction and the reliability of quality.

[0034] Embodiment 2; See also Figure 1-Figure 8 In an embodiment of the present invention, a construction method of an assembled composite thermal insulation outer formwork based on BIM technology is provided to manufacture the above-mentioned outer formwork. The construction method comprises the following steps: Step S1, BIM model establishment and design optimization, using BIM software to establish a three-dimensional model of the outer formwork, including detailed parameters of the thermal insulation layer 1, the structural reinforcement layer 2, the waterproof layer 3, the finishing layer 4 and the fixing mechanism 5; Step S2, factory prefabrication, the list generated by the BIM model, the prefabrication of each layer of materials in the factory to ensure that the dimensional accuracy and material properties of each layer meet the design requirements; Step S3, virtual assembly and error analysis, after the panel is manufactured, the required assembly components are scanned one by one and the three-dimensional data are obtained, and virtual assembly is performed through the BIM software to analyze the errors and Make adjustments; Step S4, on-site installation, transport the prefabricated outer formwork to the construction site, and perform precise installation according to the construction simulation of the BIM model; Step S5, fixing and sealing treatment, the layers are mechanically interlocked by the fixing mechanism 5, the installation screws 502 pass through the installation screw holes 501 of each layer, and are fixed with the clamping blocks 503 to ensure that the layers are tightly combined; Step S6, finishing construction, constructing the finishing layer 4 on the outside of the waterproof layer 3, using a stone-like fluorocarbon coating system with a dry film thickness of ≥80μm to ensure the durability and aesthetics of the finishing layer 4; Step S7, quality acceptance and monitoring, using BIM technology to monitor the construction process in real time and perform quality acceptance to ensure that the construction quality meets the design requirements.

[0035] A transition interface agent layer is set between the insulation layer 1 and the structural reinforcement layer 2, using an epoxy resin-based interface agent with a coating amount of ≥0.3kg / m² and a bonding strength of ≥1.0MPa to enhance the bonding between the insulation layer 1 and the structural reinforcement layer 2. Before the construction of the finishing layer 4, the color and texture simulation is carried out through BIM technology to ensure the coordination between the finishing layer 4 and the overall style of the building; during the construction process, an intelligent construction quality and safety control method is used to monitor the construction quality in real time to ensure construction safety.

[0036] The working principle of the embodiment of the present invention is: BIM model establishment and design optimization, using BIM software to establish a three-dimensional model of the external formwork, including detailed parameters of the insulation layer 1, the structural reinforcement layer 2, the waterproof layer 3, the finishing layer 4 and the fixing mechanism 5. The BIM model can not only accurately present the size and material properties of each layer, but also discover potential design problems in advance by simulating the construction process. Through the three-dimensional visualization function of BIM technology, designers can intuitively adjust and optimize the design scheme to ensure the rationality of each layer structure and the feasibility of construction. Factory prefabrication, according to the list generated by the BIM model, prefabrication of each layer of materials is carried out in the factory. Factory prefabrication can strictly control the dimensional accuracy and performance of the materials to ensure that the apparent density and thermal conductivity of the insulation layer 1 meet the design requirements.

[0037] Virtual assembly and error analysis: After the panels are manufactured, the required assembly components are scanned one by one and three-dimensional data is obtained. Virtual assembly is performed through BIM software, errors are analyzed and adjustments are made. This process can detect possible problems that may arise during the assembly process in advance.

[0038] On-site installation: transport the prefabricated external formwork to the construction site and install it accurately according to the construction simulation of the BIM model. The construction simulation function of BIM technology can provide detailed installation guidance for construction personnel to ensure the installation accuracy of the formwork. Fixing and sealing treatment: the layers are mechanically interlocked through the fixing mechanism 5, and the installation screw 502 passes through the installation screw hole 501 of each layer and is fixed with the clamp block 503 to ensure that each layer is tightly combined.

[0039] For finishing construction, the finishing layer 4 is constructed on the outside of the waterproof layer 3, and a fluorocarbon coating system with a stone-like texture is used, with a dry film thickness of ≥80μm to ensure the durability and aesthetics of the finishing layer 4. Before construction, the color and texture are simulated through BIM technology to ensure the coordination between the finishing layer 4 and the overall style of the building. Quality acceptance and monitoring, using BIM technology to monitor and inspect the construction process in real time to ensure that the construction quality meets the design requirements. BIM technology can collect and analyze the quality data of the construction site in real time, and timely discover and deal with quality problems through intelligent construction quality and safety control methods.

[0040] A transition interface agent layer is provided between the thermal insulation layer 1 and the structural reinforcement layer 2, using an epoxy resin-based interface agent with a coating amount of ≥0.3kg / m² and a bonding strength of ≥1.0MPa to enhance the bonding force between the thermal insulation layer 1 and the structural reinforcement layer 2. The application of this layer can effectively prevent the peeling between the thermal insulation layer 1 and the structural reinforcement layer 2 and improve the stability of the overall structure.

[0041] Embodiment 3; See also Figure 1-Figure 8In the embodiment of the present invention, the positioning method for on-site installation in step S4 is: using a total station and a BIM model for linkage positioning, with a horizontal positioning error of ≤2mm and a verticality deviation of ≤1 / 1000; the gap between the template and the main structure is ≤3mm, and the out-of-tolerance part is filled with a polyurethane foaming agent, with a foaming density of ≥35kg / m³ and a compression strength of ≥150kPa. After the construction of the finishing layer 4 in step S6, the following shall be carried out: an ultraviolet accelerated aging test, with a gloss retention rate of ≥80% after 3000h; and a stain resistance test, with a reflectivity reduction rate of ≤15%.

[0042] The quality acceptance criteria in step S7 include: the thermal conductivity of the insulation layer 1 is ≤0.035W / (m·K) by on-site sampling, and the hollow rate is ≤3% by infrared thermal imaging; the waterproof layer 3 is tested by negative pressure, and the negative pressure value is -500Pa and maintained for 10 minutes without leakage; the color difference ΔE of the finishing layer 4 is ≤1.5, and the adhesion test cross-cutting grade is ≥1.

[0043] The working principle of the embodiment of the present invention is as follows: In step S4, the on-site installation uses the total station and BIM model linkage positioning technology to ensure the accurate installation of the template. The total station achieves horizontal positioning error ≤ 2mm and verticality deviation ≤ 1 / 1000 through real-time data interaction with the BIM model. This high-precision positioning method can effectively reduce errors in the installation process and ensure the close integration of the external template and the main structure.

[0044] In step S6, after the finishing layer 4 is constructed, it is necessary to conduct an ultraviolet accelerated aging test and a stain resistance test. The ultraviolet accelerated aging test requires that the gloss retention rate of the finishing layer 4 is ≥ 80% after 3000 hours. This test standard ensures that the finishing layer 4 can maintain a good appearance and performance during long-term use.

[0045] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the present invention, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0048] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0049] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An assembled composite thermal insulation exterior formwork based on BIM technology, characterized in that: From inside to outside, it includes: Insulation layer (1): using closed-cell graphite polystyrene foam board, with apparent density ≥ 25 kg / m³, thermal conductivity ≤ 0.032 W / (m·K), and a concave-convex tooth-groove structure with a spacing of ≤ 300 mm on the outer side; Structural reinforcement layer (2): composed of a galvanized steel wire mesh with a diameter of 1.2-1.5 mm and a fiber-reinforced cement-based composite material with a thickness of 8-12 mm, with a tensile strength of ≥8 MPa; Waterproof layer (3): using polymer modified cement-based waterproof coating, with a coating amount of 1.5-2.0 kg / m², forming a continuous film layer with a thickness of ≥1.2 mm, and a bonding strength with the insulation layer (1) of ≥0.25 MPa; Finishing layer (4): Use a stone-like fluorocarbon coating system with a dry film thickness of ≥80μm and an artificial weathering resistance of ≥3000h; A fixing mechanism (5) is installed between each layer and mechanical interlocking is achieved through the fixing mechanism (5). A three-dimensional parametric design is performed using a BIM model to automatically generate a node detail drawing. The fixing mechanism (5) includes a mounting screw hole (501) opened on each layer, a mounting screw rod (502) is threadedly connected in an inner cavity of the mounting screw hole (501), and a clamping block (503) is installed on the back of the mounting screw rod (502).

2. According to the BIM technology-based assembled composite thermal insulation outer formwork of claim 1, it is characterized by: The thermal insulation layer (1) comprises a protective frame (101), a foam board body (102) is installed inside the protective frame (101) and is used for thermal insulation of the entire outer formwork; the structural reinforcement layer (2) comprises a galvanized steel mesh body (201), the galvanized steel mesh body (201) is installed on the front and back sides of the thermal insulation layer (1) and enhances the strength of the outer formwork; the waterproof layer (3) comprises a continuous membrane layer body (301), the continuous membrane layer body (301) covers the front and back sides of the structural reinforcement layer (2) and plays a waterproof role.

3. The assembled composite thermal insulation outer formwork based on BIM technology according to claim 2 is characterized by: The finishing layer (4) comprises a stone-like paint layer (401), the stone-like paint layer (401) being distributed on the front and back sides of the waterproof layer (3) and having durability; the outer formwork further comprises a sealing layer (6), the sealing layer (6) being located on the outer walls of the thermal insulation layer (1), the structural reinforcement layer (2), the waterproof layer (3) and the finishing layer (4) and being used for filling the outer formwork.

4. The assembled composite thermal insulation outer formwork based on BIM technology according to claim 3 is characterized by: A clamping groove (504) is provided inside the mounting screw hole (501) of the stone-like paint layer (401) located at the back, and the clamping block (503) can rotate inside the clamping groove (504) to achieve the fixing effect between the layers. A mounting sheet (505) is installed on the front side of the mounting screw rod (502), and a fixing screw hole (506) is provided between the mounting sheet (505) and the front side of the stone-like paint layer (401) located at the front side, and a fixing screw rod (507) is threadedly connected in the inner cavity of the fixing screw hole (506).

5. The assembled composite thermal insulation outer formwork based on BIM technology according to any one of claims 1 to 4, characterized in that: A construction method of an assembled composite thermal insulation outer formwork based on BIM technology is provided to produce the outer formwork. The construction method comprises the following steps: Step S1, BIM model establishment and design optimization, using BIM software to establish a three-dimensional model of the external formwork, including detailed parameters of the insulation layer (1), the structural reinforcement layer (2), the waterproof layer (3), the finishing layer (4) and the fixing mechanism (5); Step S2, factory prefabrication, the list generated by the BIM model, and the prefabrication of each layer of materials in the factory to ensure that the dimensional accuracy and material performance of each layer meet the design requirements; Step S3, virtual assembly and error analysis: after the panel is manufactured, the required assembly components are scanned one by one to obtain three-dimensional data, and virtual assembly is performed through BIM software to analyze errors and make adjustments; Step S4, on-site installation, transporting the prefabricated external formwork to the construction site and accurately installing it according to the construction simulation of the BIM model; Step S5, fixing and sealing treatment, the layers are mechanically interlocked by the fixing mechanism (5), the mounting screws (502) pass through the mounting screw holes (501) of each layer, and are fixed with the clamping blocks (503) to ensure that the layers are tightly combined; Step S6, finishing construction, constructing a finishing layer (4) on the outside of the waterproof layer (3), using a stone-like fluorocarbon coating system with a dry film thickness of ≥80 μm, to ensure the durability and aesthetics of the finishing layer (4); Step S7, quality acceptance and monitoring, uses BIM technology to conduct real-time monitoring and quality acceptance of the construction process to ensure that the construction quality meets the design requirements.

6. The construction method of the assembled composite thermal insulation outer formwork based on BIM technology according to claim 5 is characterized by: A transition interface agent layer is provided between the thermal insulation layer (1) and the structural reinforcement layer (2), using an epoxy resin-based interface agent with a coating amount of ≥0.3kg / m² and a bonding strength of ≥1.0MPa, so as to enhance the bonding force between the thermal insulation layer (1) and the structural reinforcement layer (2).

7. The construction method of the assembled composite thermal insulation outer formwork based on BIM technology according to claim 5 is characterized by: Before the construction of the finishing layer (4), the color and texture simulation is carried out through BIM technology to ensure the coordination between the finishing layer (4) and the overall style of the building; during the construction process, intelligent construction quality and safety control methods are adopted to monitor the construction quality in real time to ensure construction safety.

8. The construction method of the assembled composite thermal insulation outer formwork based on BIM technology according to claim 5 is characterized by: The positioning method for on-site installation described in step S4 is: use the total station and BIM model to link positioning, the horizontal positioning error is ≤2mm, the verticality deviation is ≤1 / 1000; the gap between the template and the main structure is ≤3mm, and the out-of-tolerance parts are filled with polyurethane foaming agent, the foaming density is ≥35kg / m³, and the compression strength is ≥150kPa.

9. The construction method of the assembled composite thermal insulation outer formwork based on BIM technology according to claim 5 is characterized by: After the finishing layer (4) in step S6 is constructed, the following procedures need to be carried out: an ultraviolet accelerated aging test, where the gloss retention rate is ≥ 80% after 3000 hours; and a stain resistance test, where the reflectivity reduction rate is ≤ 15%.

10. The construction method of the assembled composite thermal insulation outer formwork based on BIM technology according to claim 5 is characterized by: The quality acceptance criteria in step S7 include: the thermal conductivity of the insulation layer (1) is ≤0.035 W / (m·K) when tested on-site, and the hollow rate is ≤3% when tested by infrared thermal imaging; the waterproof layer (3) is tested by negative pressure, and the negative pressure is -500 Pa and maintained for 10 minutes without leakage; the color difference ΔE of the finishing layer (4) is ≤1.5, and the adhesion test cross-cutting grade is ≥1.

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