Prefabricated light energy-saving wall panel for building and construction method thereof

Abstract

The application relates to the field of prefabricated wallboards, and discloses a prefabricated light energy-saving wallboard for buildings and a construction method. The prefabricated light energy-saving wallboard for buildings comprises upper and lower outer hanging wallboards arranged in sequence, a continuous several-shaped connecting joint is formed between the lower end surface of the upper outer hanging wallboard and the upper end surface of the lower outer hanging wallboard, and the connecting joint is filled with a graphene reinforced aerogel layer. The upper outer hanging wallboard and the lower outer hanging wallboard both comprise a paint layer, a foam glass layer, a thermal insulation board and a steel fiber reinforced concrete outer leaf board which are sequentially connected. The steel fiber reinforced concrete outer leaf boards of the upper outer hanging wallboard and the lower outer hanging wallboard are respectively connected with outer hanging convex beams of a structural beam. The prefabricated light energy-saving wallboard for buildings and the construction method have the advantages of good thermal insulation performance, high modular prefabrication degree, convenient construction, high construction efficiency, good sealing effect and long service life.

Description

Technical Field

[0001] This application relates to the field of prefabricated wall panels, and more specifically, to a prefabricated lightweight energy-saving wall panel for buildings and a construction method thereof. Background Technology

[0002] As a core component of building envelope, prefabricated exterior walls have become a key focus in the construction industry due to their energy-saving performance and construction efficiency. Traditional prefabricated exterior walls generally employ a single insulation layer and a concrete / steel structure composite system, which presents the following technical bottlenecks: 1. The insulation layer exhibits a significant thermal bridging effect, with heat transfer coefficients often exceeding 0.3 W / (m²). 2 ·K), which is insufficient to meet the requirements of high-performance building envelopes, such as ultra-low energy consumption and near-zero energy consumption buildings ≤0.15W / (m²). 2 • Strict requirements of K); 2. Insufficient modular prefabrication (usually <80%), with on-site assembly relying on welding or bolted mechanical connections, resulting in poor continuity of the airtight layer (n50>1.0h). -1 ); ); , Conventional sealants are often used for joint treatment, which are prone to cracking due to temperature differences and deformation, affecting the durability of the building envelope. Summary of the Invention

[0003] The purpose of this application is to provide a lightweight energy-saving wall panel for prefabricated buildings and a construction method, which has the advantages of good thermal insulation performance, high degree of modular prefabrication, convenient construction and high construction efficiency, as well as good sealing effect and long service life.

[0004] The implementation method of this application is as follows:

[0005] This application provides a prefabricated lightweight energy-saving wall panel for buildings, comprising an upper outer wall panel and a lower outer wall panel arranged vertically. A continuous Z-shaped connecting seam is formed between the lower end face of the upper outer wall panel and the upper end face of the lower outer wall panel. The connecting seam is filled with a graphene-reinforced aerogel layer. Both the upper and lower outer wall panels include a paint layer, a foam glass layer, an insulation board, and a steel fiber reinforced concrete outer leaf panel connected in sequence. The steel fiber reinforced concrete outer leaf panels of the upper and lower outer wall panels are respectively connected to the external convex beams of the structural beam.

[0006] In some alternative embodiments, the insulation board and the foam glass layer are bonded together by a polyester-amino structural adhesive layer, which is prepared by mixing isocyanate prepolymer and polyol curing agent at a volume ratio of 1:0.8-1.2 and then curing.

[0007] In some alternative embodiments, the steel fiber reinforced concrete outer leaf plate is bonded to the insulation board by a polymer cement mortar layer, and the top and bottom of the steel fiber reinforced concrete outer leaf plate are connected to the top and bottom of the insulation board by multiple glass fiber reinforcements, respectively; the polymer cement mortar layer is prepared by mixing cement, quartz sand and redispersible latex powder in a mass ratio of 1:2:0.15-0.3.

[0008] In some alternative implementations, the steel fiber reinforced concrete outer leaf plate is prepared by adding glass fiber to concrete, with the amount of glass fiber added being 1-3% of the concrete volume.

[0009] In some alternative embodiments, the steel fiber reinforced concrete outer leaf plate is prepared by adding glass fiber and polypropylene fiber to concrete, wherein the amount of glass fiber added is 1-3% of the concrete volume and the amount of polypropylene fiber added is 0.1-0.5% of the concrete volume.

[0010] In some optional implementations, multiple embedded rods are pre-embedded in the upper and lower outer wall panels, and angle steel is connected to the top and bottom surfaces of the outer convex beam of the structural beam. The embedded rods connecting the upper and lower outer wall panels pass through and connect to the angle steel on the top and bottom surfaces of the outer convex beam. Fixed steel plates connected to the angle steel are provided on the top and bottom surfaces of the outer convex beam, and two fixed steel plates are respectively connected to pre-embedded welded hooks embedded in the outer convex beam. An elastic sealant layer is filled between the connection seam between the upper and lower outer wall panels and between the two angle steels and the end face of the outer convex beam. An upper cement mortar layer is filled between the outer wall of the upper outer wall panel, the top of the outer convex beam, and the outer wall of the structural beam. A lower cement mortar layer is filled between the outer wall of the lower outer wall panel, the bottom of the outer convex beam, and the outer wall of the structural beam.

[0011] This application also provides a construction method for the aforementioned prefabricated lightweight energy-saving wall panels, including the following steps:

[0012] The upper and lower external wall panels are hoisted to the side of the structural beam;

[0013] After filling the upper surface of the lower outer wall panel with graphene-reinforced aerogel, it is spliced ​​and bonded to the lower surface of the upper outer wall panel.

[0014] The upper and lower exterior wall panels are connected to the structural beams respectively.

[0015] In some alternative implementations, connecting the upper and lower exterior wall panels to the structural beams includes the following steps:

[0016] Angle steels are connected to the top and bottom of the external convex beam of the structural beam, so that the two angle steels are connected to the fixed steel plates embedded in the top and bottom of the external convex beam, and the embedded rods of the upper and lower external wall panels pass through and connect the two angle steels respectively.

[0017] An elastic sealant layer is obtained by filling the joint between the upper and lower outer wall panels and the end face of the two angle steels and the outer convex beam with elastic sealant.

[0018] A cement mortar layer is applied between the outer wall of the upper outer wall panel, the top of the outer protruding beam, and the outer wall of the structural beam; a lower cement mortar layer is applied between the outer wall of the lower outer wall panel, the bottom of the outer protruding beam, and the outer wall of the structural beam.

[0019] Connect the cover plate to the top surface of the upper cement mortar layer and the bottom surface of the lower cement mortar layer.

[0020] In some alternative implementations, the upper and lower exterior wall panels are formed by sequentially connecting a paint layer, a foam glass layer, an insulation board, and a steel fiber reinforced concrete outer leaf panel;

[0021] When connecting the insulation board and the steel fiber concrete outer leaf plate, the adjacent surfaces of the insulation board and the steel fiber concrete outer leaf plate are sandblasted to roughen them, so that the roughness Ra reaches 1.6-3.2μm;

[0022] The polymer cement mortar is injected from bottom to top into the joint between the insulation board and the steel fiber concrete outer leaf board at a pressure of 0.2-0.5MPa for curing.

[0023] An alkali-resistant glass fiber mesh reinforcement layer is inserted before the initial setting of the polymer cement mortar. The unit area mass of the alkali-resistant glass fiber mesh reinforcement layer is ≥160g / m². 2 .

[0024] In some alternative implementations, when the foam glass layer and the insulation board are joined, an 80-120 g / m² coating is applied to the adjacent sides of the foam glass layer and the insulation board. 2 The silane coupling agent is dried to form an active interface layer;

[0025] A polyurethane structural adhesive is obtained by mixing isocyanate prepolymer and polyol curing agent at a volume ratio of 1:0.8-1.2. 1-3% of nano-silica fumed silica and 0.5-1% of flame-retardant phosphate ester compound are added to the polyurethane structural adhesive and mixed evenly.

[0026] Polyurethane structural adhesive is injected into the joint between the foam glass layer and the insulation board for curing. The injection rate is 200-400 mL / min, and the joint width is 15-25 mm.

[0027] A stainless steel wire mesh is embedded before the polyurethane structural adhesive cures.

[0028] The beneficial effects of this application are as follows: The prefabricated lightweight energy-saving wall panel provided by this application includes an upper outer wall panel and a lower outer wall panel arranged vertically. The lower end face of the upper outer wall panel and the upper end face of the lower outer wall panel form a continuous Z-shaped connecting seam. The connecting seam is filled with a graphene-reinforced aerogel layer. Both the upper and lower outer wall panels include a paint layer, a foam glass layer, an insulation board, and a steel fiber concrete outer leaf panel connected in sequence. The steel fiber concrete outer leaf panels of the upper and lower outer wall panels are respectively connected to the outer convex beams of the structural beam. The prefabricated lightweight energy-saving wall panel and construction method provided in this application form an upper and lower outer wall panel by sequentially connecting a paint layer, a foam glass layer, an insulation board, and a steel fiber concrete outer leaf panel. This creates a gradient insulation structure system to improve thermal insulation performance. The panel is highly modular and prefabricated, making construction convenient and efficient. Furthermore, a graphene-reinforced aerogel layer is filled into the continuous zigzag joint between the lower end face of the upper outer wall panel and the upper end face of the lower outer wall panel, achieving a triple seal of air tightness, water tightness, and thermal resistance. This provides advantages such as good sealing effect and long service life. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 A cross-sectional structural schematic diagram showing the connection between the prefabricated lightweight energy-saving wall panel and the external convex beam of the structural beam, as provided in the embodiments of this application.

[0031] Figure 2 A cross-sectional structural diagram showing the splicing of the upper and lower external wall panels in the prefabricated lightweight energy-saving wall panel provided in the embodiments of this application;

[0032] Figure 3 This is a cross-sectional structural diagram showing the connection between the upper and lower external wall panels of the prefabricated lightweight energy-saving wall panel provided in the embodiments of this application, using a graphene-reinforced aerogel layer.

[0033] In the diagram: 100, upper external wall panel; 101, upper section; 110, lower external wall panel; 111, lower section; 120, paint layer; 130, foam glass layer; 140, insulation board; 150, steel fiber reinforced concrete outer leaf panel; 160, polyester-methylene structural adhesive layer; 170, polymer cement mortar layer; 180, glass fiber reinforcement; 200, graphene-reinforced aerogel layer; 210, embedded rod; 220, angle steel; 230, fixing steel plate; 240, embedded welded hook; 250, elastic sealant layer; 260, upper cement mortar layer; 270, lower cement mortar layer; 280, cover plate; 300, structural beam; 310, external cantilever beam. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0036] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0037] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application 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, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0038] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0039] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0040] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] The features and performance of the prefabricated lightweight energy-saving wall panel and construction method of this application are further described in detail below with reference to embodiments.

[0042] like Figure 1 , Figure 2 and Figure 3As shown in the figure, an embodiment of the present application provides a lightweight energy-saving wall panel for prefabricated buildings, which includes an upper external wall panel 100 and a lower external wall panel 110 arranged up and down. The lower end surface of the upper external wall panel 100 is provided with two continuously connected U-shaped upper sections 101, and the upper end surface of the lower external wall panel 110 is provided with two continuously connected inverted U-shaped lower sections 111. A connection seam in the shape of two continuously connected U-shaped is formed between the lower end surface of the upper external wall panel 100 and the upper end surface of the lower external wall panel 110, and a graphene aerogel enhanced layer 200 is filled in the connection seam. Both the upper external wall panel 100 and the lower external wall panel 110 include a paint layer 120, a foam glass layer 130, a thermal insulation board 140, and a steel fiber concrete outer leaf panel 150 connected in sequence. The thermal insulation board 140 and the foam glass layer 130 are bonded through a polyester ammonia structural adhesive layer 160, and the steel fiber concrete outer leaf panel 150 and the thermal insulation board 140 are bonded through a polymer cement mortar layer 170. The top and bottom of the steel fiber concrete outer leaf panel 150 are respectively connected to the top and bottom of the thermal insulation board 140 through glass fiber reinforcements 180 arranged at intervals. The polyester ammonia structural adhesive layer 160 is prepared by curing a mixture of an isocyanate prepolymer and a polyol curing agent in a volume ratio of 1:0.8 - 1.2. The polymer cement mortar layer 170 is prepared by mixing cement, quartz sand, and redispersible latex powder in a mass ratio of 1:2:0.15 - 0.3. The steel fiber concrete outer leaf panel 150 is prepared by adding glass fibers and polypropylene fibers to concrete. The addition amount of glass fibers is 1 - 3% of the volume of concrete, and the addition amount of polypropylene fibers is 0.1 - 0.5% of the volume of concrete. The diameter of the glass fibers is 10 - 20μm, and the length is 12 - 36μm. Fibers are used to replace part of the aggregate in the steel fiber concrete outer leaf panel 150, which can effectively improve the flexural strength and crack resistance while reducing the dry density of the outer leaf panel to 1800 - 2000 kg / m 3 , which is 15 - 20% lower than ordinary concrete. Among them, the material of the thermal insulation board 140 is a non-combustible thermal insulation material with a thermal conductivity (25°C) ≤ 0.054 W / (m·K), high mechanical strength, a flexural load ≥ 3000 KN, a strong adhesion force to concrete, ≥ 0.2 Mpa, and low water absorption. The foam glass layer 130 is made from waste glass through foaming and sintering, with a large number of closed-cell bubbles formed inside. The dry density is generally between 150 kg / m 3 -600 kg / m 3 , much lower than traditional wall materials, directly reducing the overall weight of the wall panel.

[0043] Pre-embedded members 210 are spaced apart within the steel fiber reinforced concrete outer leaf plates 150 of the upper and lower outer wall panels 100 and 110, respectively. One end of each pre-embedded member 210 extends out of the steel fiber reinforced concrete outer leaf plate 150. The top and bottom surfaces of the outer convex beam 310 of the structural beam 300 are connected to spaced fixed steel plates 230. Each fixed steel plate 230 is connected to spaced pre-embedded welded hooks 240 embedded within the outer convex beam 310. The fixed steel plates 230 on the top and bottom surfaces of the outer convex beam 310 are each connected to an angle steel 220. The pre-embedded members 210 connecting the upper and lower outer wall panels 100 and 110 are... Angle steel 220 passes through and is connected to the top and bottom surfaces of the external convex beam 310 via nuts; an elastic sealant layer 250 is filled between the connection seam between the upper external wall panel 100 and the lower external wall panel 110, and between the two angle steels 220 and the end face of the external convex beam 310; an upper cement mortar layer 260 is filled between the outer wall of the upper external wall panel 100, the top of the external convex beam 310, and the outer wall of the structural beam 300; a lower cement mortar layer 270 is filled between the outer wall of the lower external wall panel 110, the bottom of the external convex beam 310, and the outer wall of the structural beam 300; and cover plates 280 are respectively connected to the top surface of the upper cement mortar layer 260 and the bottom surface of the lower cement mortar layer 270.

[0044] This application also provides a construction method for the above-mentioned prefabricated lightweight energy-saving wall panels, including the following steps:

[0045] Step 1: The upper outer wall panel 100 and the lower outer wall panel 110 are pre-processed in the factory. The upper outer wall panel 100 and the lower outer wall panel 110 are composed of a paint layer 120, a foam glass layer 130, an insulation board 140 and a steel fiber concrete outer leaf panel 150 connected in sequence to form a gradient insulation-structure integrated system. The steel fiber concrete outer leaf panel 150 is pre-embedded with spaced pre-embedded rods 210, one end of which extends out of the steel fiber concrete outer leaf panel 150. Glass fiber reinforcement members 180 are pre-embedded at the top and bottom of the steel fiber concrete outer leaf panel 150, so that one end of the glass fiber reinforcement member 180 extends out of the steel fiber concrete outer leaf panel 150.

[0046] 1.1 The connection between the insulation board 140 and the steel fiber reinforced concrete outer leaf plate 150 includes the following steps:

[0047] An inverted trapezoidal groove is pre-cut at the joint of the insulation board 140 to form a mechanical embedding structure. The groove depth is 1 / 3 to 1 / 2 of the thickness of the insulation board 140. The upper edge of the trapezoidal groove is 20-30mm and the lower edge is 15-25mm.

[0048] The surfaces of the insulation board 140 and the steel fiber concrete outer leaf plate 150 adjacent to each other are sandblasted to roughen the surface roughness Ra to 1.6-3.2μm.

[0049] The insulation board 140 is attached to the steel fiber concrete outer leaf plate 150, and the insulation board 140 and the steel fiber concrete outer leaf plate 150 are connected by the spaced glass fiber reinforcement 180. The glass fiber reinforcement 180 with low density and high tensile strength can reduce the overall weight of the wall panel, reduce the difficulty of hoisting and increase the structural load.

[0050] A polymer cement mortar layer 170 is obtained by injecting polymer cement mortar into the joint between the insulation board 140 and the steel fiber reinforced concrete outer leaf plate 150 from bottom to top using a pressure grouting machine. The polymer cement mortar layer 170 is prepared by mixing cement, quartz sand and redispersible latex powder in a mass ratio of 1:2:0.15-0.3. The grouting width of the polymer cement mortar is 10-20mm.

[0051] An alkali-resistant glass fiber mesh reinforcement layer is inserted before the initial setting of the polymer cement mortar. The unit area mass of the alkali-resistant glass fiber mesh reinforcement layer is ≥160g / m². 2 The mesh size of the alkali-resistant glass fiber mesh reinforcement layer is 4mm×4mm;

[0052] During the maintenance phase, maintain an ambient humidity of ≥90% and a temperature of 20±5℃, with a maintenance cycle of no less than 7 days.

[0053] By combining the fiberglass mesh reinforcement layer with polymer cement mortar, the bond strength retention rate after 50 freeze-thaw cycles is ≥85%, significantly better than that of ordinary steel reinforcement connectors. Simultaneously, the fiberglass in the mesh reinforcement layer exhibits strong temperature deformation adaptability, and the three-dimensional random distribution of the fibers endows the joint with elastic deformation capacity, absorbing ±3mm of thermal expansion and contraction displacement, thus avoiding stress concentration caused by rigid connections. Fiberglass has low cost, with a unit price 40-50% lower than stainless steel and requiring no anti-corrosion coating maintenance, reducing the total life-cycle cost by more than 25%. It also boasts good fire resistance; the alkali-resistant fiberglass has a melting point >1000℃, and when combined with the polyurethane structural adhesive (oxygen index ≥28%) between the foam glass layer 130 and the insulation board 140, it can meet the GB8624-2012 A2 fire resistance standard.

[0054] 1.2 The connection between the foam glass layer 130 and the insulation board 140 includes the following steps:

[0055] A serrated interlocking structure is pre-processed on the joint surface of the foam glass layer 130 to form a physical interlocking and reinforcing interface with the polyurethane structural adhesive, which can increase the shear strength by 50-70%. The tooth depth of the serrated interlocking structure is 2-4mm, the tooth pitch is 5-8mm, and the tooth tip angle is 60-90°.

[0056] Apply 80-120 g / m² of coating to the adjacent side of the foam glass layer 130 and the insulation board 140. 2The silane coupling agent is dried to form an active interface layer;

[0057] A polyurethane structural adhesive is obtained by mixing isocyanate prepolymer and polyol curing agent at a volume ratio of 1:0.8-1.2. 1-3% of nano-silica fumed silica and 0.5-1% of flame-retardant phosphate ester compound are added to the polyurethane structural adhesive and mixed evenly.

[0058] The prepared polyurethane structural adhesive was injected into the joint between the foam glass layer 130 and the insulation board 140 using a two-component injection gun for curing. The injection rate was controlled at 200-400 mL / min and the joint width was 15-25 mm.

[0059] Before the polyurethane structural adhesive cures, a stainless steel wire mesh is embedded. The mesh size of the stainless steel wire mesh is 10mm×10mm, the diameter of the stainless steel wire is 0.8-1.2mm, and the coverage of the stainless steel wire mesh is ≥60%.

[0060] During the curing stage, maintain an ambient temperature of 15-30℃ and a relative humidity of 40-70%, with a curing time of 24-48 hours.

[0061] 1.3 The connection between the paint layer 120 and the foam glass layer 130 includes the following steps:

[0062] The surface of the foam glass layer 130 is activated using a plasma cleaner with an output power of 300-500W and a processing speed of 0.5-1.5m / min, thereby increasing the surface energy of the foam glass layer 130 to 50-60mN / m.

[0063] An epoxy-based interface reinforcing agent is applied to the surface of the foam glass layer 130, with a coating amount of 50-80 g / m². 2 After drying, a transition layer is formed, which makes the bond strength between the transition layer and the foam glass layer 130 ≥1.0MPa;

[0064] A coating layer is prepared on the outer surface of the foam glass layer 130 using a high-pressure airless spraying method. The coating layer includes, from the inside out, an anti-corrosion primer layer, a heat-insulating intermediate layer, and a self-cleaning topcoat layer. The anti-corrosion primer layer is a zinc chromate yellow anti-rust pigment layer with a dry film thickness of 20-30 μm. The heat-insulating intermediate layer is a layer containing aerogel particles with a particle size of 1-5 μm and a dry film thickness of 50-70 μm. The self-cleaning topcoat layer is a layer containing an organosilicone hydrophobic agent with a static water contact angle ≥120° and a dry film thickness of 10-20 μm. The wet film thickness of the coating layer is 200-500 μm, and the dry film thickness is 80-150 μm. The adhesion between the coating layer and the substrate of the foam glass layer 130 is controlled to be ≥1.5 MPa, and the coating coverage is 0.8-1.2 kg / m². 2;

[0065] Step 2: Hoist the upper outer wall panel 100 and the lower outer wall panel 110 to the side of the outer convex beam 310 of the structural beam 300 to be installed. Mark the installation positioning control line on the outer convex beam 310 of the structural beam 300. The top and bottom surfaces of the outer convex beam 310 are respectively embedded with spaced fixed steel plates 230. The top and bottom of the outer convex beam 310 are respectively embedded with spaced pre-embedded welded hooks 240. Each fixed steel plate 230 is connected to a corresponding set of spaced pre-embedded welded hooks 240.

[0066] Step 3: After filling the upper surface of the lower outer wall panel 110 with graphene-reinforced aerogel, it is spliced ​​and bonded to the lower surface of the upper outer wall panel 100, so that the graphene-reinforced aerogel layer 200 formed by the curing of the graphene-reinforced aerogel connects the lower surface of the upper outer wall panel 100 and the upper surface of the lower outer wall panel 110. The positions, elevations, pre-embedded welded hooks 240, and positions of the fixing steel plates 230 of the structural beams 300 and the external convex beams 310 are checked.

[0067] Step 4: Connect the upper outer wall panel 100 and the lower outer wall panel 110 to the structural beam 300 respectively, including the following steps:

[0068] Angle steel 220 is connected to the top and bottom of the external convex beam 310 of the structural beam 300, so that the two angle steels 220 are connected to the fixed steel plates 230 at the top and bottom of the external convex beam 310, and the embedded rods 210 of the upper external wall panel 100 and the lower external wall panel 110 pass through and are connected to the two angle steels 220 by nuts.

[0069] Elastic sealant layer 250 is obtained by filling the connection seam between the upper outer wall panel 100 and the lower outer wall panel 110, and between the two angle steels 220 and the end face of the outer protruding beam 310 with elastic sealant.

[0070] An upper cement mortar layer 260 is constructed between the outer wall of the upper outer wall panel 100, the top of the outer protruding beam 310, and the outer wall of the structural beam 300; a lower cement mortar layer 270 is constructed between the outer wall of the lower outer wall panel 110, the bottom of the outer protruding beam 310, and the outer wall of the structural beam 300.

[0071] A cover plate 280 is connected to the top surface of the upper cement mortar layer 260 and the bottom surface of the lower cement mortar layer 270.

[0072] Conduct structural and functional inspections and acceptance of prefabricated building lightweight energy-saving wall panels.

[0073] The prefabricated building lightweight energy-saving wall panel and construction method provided by the embodiments of the present application form the upper external wall panel 100 and the lower external wall panel 110 by connecting the paint coating layer 120, the foam glass layer 130, the insulation board 140 and the steel fiber concrete outer leaf panel 150 in sequence. The bottom end of the upper external wall panel 100 and the top end of the lower external wall panel 110 are spliced through a continuous zigzag-shaped joint, and the graphene enhanced aerogel layer 200 is filled in the joint to connect the upper external wall panel 100 and the lower external wall panel 110. Thus, the upper external wall panel 100 and the lower external wall panel 110 achieve heat preservation through gradient heat preservation and the filling of the graphene enhanced aerogel layer 200, and the heat transfer coefficient breaks through the traditional technical bottleneck and is reduced to 0.21W / (m 2 ·K). At the same time, the graphene enhanced aerogel layer 200 is filled in the continuous zigzag-shaped joint at the bottom end of the upper external wall panel 100 and the top end of the lower external wall panel 110, which can significantly improve the frost resistance and shear resistance of the joint and the graphene enhanced aerogel layer 200 system, and greatly extend the service life; the paint coating layer 120, the foam glass layer 130, the insulation board 140 and the steel fiber concrete outer leaf panel 150 are connected in sequence to form the upper external wall panel 100 and the lower external wall panel 110, which can improve the modular prefabrication rate and the construction efficiency and quality of the prefabricated building lightweight energy-saving wall panel.

[0074] Among them, embedded members 210 are respectively arranged in the upper external wall panel 100 and the lower external wall panel 110, embedded welding hooks 240 are arranged in the top and bottom of the external hanging beam 310, and the embedded members 210 are connected to the embedded welding hooks 240 through connecting angle steels 220 and fixing steel plates 230. Subsequently, an elastic sealant layer 250 is constructed between the joints between the upper external wall panel 100 and the lower external wall panel 110 and the end faces of the two angle steels 220 and the external hanging beam 310; an upper cement mortar layer 260 is constructed between the outer wall of the upper external wall panel 100, the top of the external hanging beam 310 and the outer wall of the structural beam 300, a lower cement mortar layer 270 is constructed between the outer wall of the lower external wall panel 110, the bottom of the external hanging beam 310 and the outer wall of the structural beam 300, and a cover plate 280 is connected to the top surface of the upper cement mortar layer 260 and the bottom surface of the lower cement mortar layer 270, which can stably and firmly connect the upper external wall panel 100 and the lower external wall panel 110 to the external hanging beam 310 of the structural beam 300. At the same time, it effectively improves the protection effect on the graphene enhanced aerogel layer 200 in the joint between the upper external wall panel 100 and the lower external wall panel 110.

[0075] The continuous zigzag shape described in this application refers to at least two sequentially connected zigzag shapes.

[0076] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. A construction method for lightweight energy-saving wall panels for prefabricated buildings, characterized in that, The prefabricated lightweight energy-saving wall panel includes an upper outer wall panel and a lower outer wall panel arranged vertically. A continuous V-shaped connecting seam is formed between the lower end face of the upper outer wall panel and the upper end face of the lower outer wall panel. The connecting seam is filled with a graphene-reinforced aerogel layer. Both the upper and lower outer wall panels include a paint layer, a foam glass layer, an insulation board, and a steel fiber reinforced concrete outer leaf panel connected sequentially. The steel fiber reinforced concrete outer leaf panels of the upper and lower outer wall panels are respectively connected to the external convex beams of the structural beams. The steel fiber reinforced concrete outer leaf panels are bonded to the insulation board through a polymer cement mortar layer. The top and bottom of the steel fiber reinforced concrete outer leaf panels are connected to the top and bottom of the insulation board through multiple glass fiber reinforcements. The polymer cement mortar layer consists of cement, quartz sand, and redispersible latex powder in a mass ratio of 1:2:0.15-0.

3. The structure is prepared by mixing components, with multiple embedded rods pre-embedded in the upper and lower outer wall panels. Angle steel is connected to the top and bottom surfaces of the outer convex beam of the structural beam. The embedded rods connecting the upper and lower outer wall panels pass through and connect to the angle steel on the top and bottom surfaces of the outer convex beam. Fixed steel plates connected to the angle steel are provided on the top and bottom surfaces of the outer convex beam. Two fixed steel plates are connected to embedded welded hooks pre-embedded in the outer convex beam. An elastic sealant layer is filled between the connecting seam between the upper and lower outer wall panels and between the two angle steels and the end face of the outer convex beam. An upper cement mortar layer is filled between the outer wall of the upper outer wall panel, the top of the outer convex beam, and the outer wall of the structural beam. A lower cement mortar layer is filled between the outer wall of the lower outer wall panel, the bottom of the outer convex beam, and the outer wall of the structural beam. The construction method includes the following steps: The upper and lower external wall panels are hoisted to the side of the structural beam; After the upper surface of the lower outer wall panel is filled with graphene-reinforced aerogel, it is spliced ​​and bonded to the lower surface of the upper outer wall panel. The upper and lower outer wall panels are respectively connected to the structural beam.

2. The construction method of the prefabricated lightweight energy-saving wall panel according to claim 1, characterized in that, Connecting the upper and lower outer wall panels to the structural beam includes the following steps: Angle steels are connected to the top and bottom of the external convex beam of the structural beam, so that the two angle steels are respectively connected to the fixed steel plates pre-embedded at the top and bottom of the external convex beam, and the pre-embedded rods pre-embedded in the upper and lower external wall panels pass through and connect the two angle steels respectively. An elastic sealant layer is obtained by filling the connection seam between the upper and lower outer wall panels and the end face of the two angle steels and the outer convex beam with elastic sealant. An upper cement mortar layer is constructed between the outer wall of the upper outer wall panel, the top of the outer protruding beam, and the outer wall of the structural beam; a lower cement mortar layer is constructed between the outer wall of the lower outer wall panel, the bottom of the outer protruding beam, and the outer wall of the structural beam. A cover plate is connected to the top surface of the upper cement mortar layer and the bottom surface of the lower cement mortar layer.

3. The construction method of the prefabricated lightweight energy-saving wall panel for buildings according to claim 1, characterized in that, When the insulation board and the steel fiber concrete outer leaf plate are connected, the adjacent surfaces of the insulation board and the steel fiber concrete outer leaf plate are sandblasted to roughen them, so that the roughness Ra reaches 1.6-3.2μm; The polymer cement mortar is injected from bottom to top into the joint between the insulation board and the steel fiber concrete outer leaf board at a pressure of 0.2-0.5 MPa for curing. An alkali-resistant glass fiber mesh reinforcement layer is inserted before the initial setting of the polymer cement mortar, wherein the unit area mass of the alkali-resistant glass fiber mesh reinforcement layer is ≥160g / m². 2 .

4. The construction method of the prefabricated lightweight energy-saving wall panel for buildings according to claim 1, characterized in that, When the foam glass layer and the insulation board are connected, an 80-120 g / m² coating is applied to the adjacent side of the foam glass layer and the insulation board. 2 The silane coupling agent is dried to form an active interface layer; A polyurethane structural adhesive is obtained by mixing isocyanate prepolymer and polyol curing agent at a volume ratio of 1:0.8-1.

2. 1-3% by mass of nano-silica and fumed silica and 0.5-1% by mass of flame-retardant phosphate ester compound are added to the polyurethane structural adhesive and mixed evenly. The polyurethane structural adhesive is injected into the joint between the foam glass layer and the insulation board and cured. The injection rate is 200-400 mL / min and the joint width is 15-25 mm. A stainless steel wire mesh is embedded before the polyurethane structural adhesive cures.

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