Fabricated building light energy-saving wallboard and construction method

Abstract

The invention discloses a fabricated building light energy-saving wallboard and a construction method, and relates to the field of fabricated wallboards. The fabricated building light energy-saving wallboard comprises an upper externally-hung wallboard body and a lower externally-hung wallboard body which are arranged up and down, a continuous n-shaped connecting seam is defined between the lower end face of the upper externally-hung wallboard body and the upper end face of the lower externally-hung wallboard body, and the connecting seam is filled with a graphene reinforced aerogel layer; each of the upper external wall panel and the lower external wall panel comprises a paint layer, a foam glass layer, an insulation board and a steel fiber reinforced concrete outer acanthus which are connected in sequence; and the steel fiber reinforced concrete outer acanthus of the upper external wall panel and the lower external wall panel are respectively connected with the external convex beams of the structural beam. The fabricated building light energy-saving wallboard and the construction method have the advantages of being good in heat preservation and heat insulation performance, high in modular prefabrication degree, convenient to construct and high in construction efficiency, and meanwhile have the advantages of being good in sealing effect and long in service life.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fabricated wallboards, in particular, to a fabricated building light energy-saving wallboard and a construction method. BACKGROUND

[0002] As a core component of building envelope structure, the energy-saving performance and construction efficiency of fabricated exterior wall become the focus in the field of building construction. The traditional fabricated exterior wall generally adopts a single thermal insulation layer and a concrete / steel structure composite system, which has the following technical bottlenecks: 1. The thermal bridge effect of the thermal insulation layer is significant, and the heat transfer coefficient is usually higher than 0.3 W / (m 2 ·K), which is difficult to meet the requirements of high-performance envelope structure, such as ultra-low energy consumption, near-zero energy consumption building ≤0.15 W / (m 2 ·K); 2. The degree of modular prefabrication is insufficient (usually <80%), and the on-site assembly relies on welding or bolt mechanical connection, resulting in poor continuity of the air barrier (n50>1.0h -1 ); 3. The node processing usually adopts conventional sealant, which is prone to cracking due to temperature difference deformation, affecting the durability of the envelope structure. SUMMARY

[0003] The present application aims to provide a fabricated building light energy-saving wallboard and a construction method, which has the advantages of good thermal insulation and heat insulation performance, high degree of modular prefabrication, convenient construction, high construction efficiency, good sealing effect, and long service life.

[0004] The implementation of the present application is as follows: The present application provides a fabricated building light energy-saving wallboard, which comprises upper and lower externally hung wallboards arranged in sequence, a continuous U-shaped connecting joint is formed between the lower end surface of the upper externally hung wallboard and the upper end surface of the lower externally hung wallboard, and a graphene reinforced aerogel layer is filled in the connecting joint. The upper externally hung wallboard and the lower externally hung wallboard each comprise a coating layer, a foam glass layer, a thermal insulation board, and a steel fiber reinforced concrete outer leaf board connected in sequence. The steel fiber reinforced concrete outer leaf boards of the upper externally hung wallboard and the lower externally hung wallboard are connected with the externally hung convex beams of the structural beams, respectively.

[0005] In some optional embodiments, the thermal insulation board and the foam glass layer are bonded by a polyester ammonia structural adhesive layer, which is prepared by mixing isocyanate prepolymer with polyol curing agent at a volume ratio of 1:0.8-1.2 and then curing.

[0006] In some alternative embodiments, the outer leaf of steel fiber reinforced concrete is bonded to the insulation board through a polymer cement mortar layer, and the top and bottom of the outer leaf of steel fiber reinforced concrete are connected to the top and bottom of the insulation board through a plurality of glass fiber reinforced elements; 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.

[0007] In some alternative embodiments, the outer leaf of steel fiber reinforced concrete is prepared by adding glass fiber to the concrete, and the amount of glass fiber added is 1-3% of the volume of the concrete.

[0008] In some alternative embodiments, the outer leaf of steel fiber reinforced concrete is prepared by adding glass fiber and polypropylene fiber to the concrete, and the amount of glass fiber added is 1-3% of the volume of the concrete, and the amount of polypropylene fiber added is 0.1-0.5% of the volume of the concrete.

[0009] In some alternative embodiments, a plurality of embedded rods are embedded in the upper and lower outer hanging wallboards, respectively, and angle steels are connected to the top and bottom surfaces of the outer hanging protruding beams of the structural beam, the embedded rods of the upper and lower outer hanging wallboards pass through and connect the angle steels on the top and bottom surfaces of the outer hanging protruding beams, respectively, the top and bottom surfaces of the outer hanging protruding beams are provided with fixed steel plates connected to the angle steels, respectively, and the two fixed steel plates are connected to embedded welding hooks embedded in the outer hanging protruding beams; an elastic sealant layer is filled between the connecting joints of the upper and lower outer hanging wallboards, between the two angle steels and the end surfaces of the outer hanging protruding beams, between the outer wall of the upper outer hanging wallboard, the top of the outer hanging protruding beam and the outer wall of the structural beam, and between the outer wall of the lower outer hanging wallboard, the bottom of the outer hanging protruding beam and the outer wall of the structural beam.

[0010] The application also provides a construction method of the prefabricated building light energy-saving wallboard, comprising the following steps: hoisting the upper and lower outer hanging wallboards to the side surface of the structural beam; filling the upper end surface of the lower outer hanging wallboard with graphene enhanced aerogel and splicing and bonding with the lower end surface of the upper outer hanging wallboard; connecting the upper and lower outer hanging wallboards to the structural beam, respectively.

[0011] In some alternative embodiments, connecting the upper and lower outer hanging wallboards to the structural beam, respectively, comprises the following steps: connecting angle steels to the top and bottom surfaces of the outer hanging protruding beams of the structural beam, respectively, so that the two angle steels are connected to the fixed steel plates embedded in the top and bottom of the outer hanging protruding beams, respectively, and the embedded rods of the upper and lower outer hanging wallboards pass through and connect the two angle steels, respectively; filling an elastic sealant layer by filling an elastic sealant between the connecting joints of the upper and lower outer hanging wallboards, between the two angle steels and the end surfaces of the outer hanging protruding beams. An upper cement mortar layer is constructed between the outer wall of the upper outer hanging wallboard, the top of the outer hanging beam and the outer wall of the structural beam, and a lower cement mortar layer is constructed between the outer wall of the lower outer hanging wallboard, the bottom of the outer hanging 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.

[0012] In some optional embodiments, the upper outer hanging wallboard and the lower outer hanging wallboard are sequentially connected by a paint layer, a foam glass layer, an insulation board and a steel fiber reinforced concrete outer leaf panel; When the insulation board and the steel fiber reinforced concrete outer leaf panel are connected, the surfaces adjacent to the insulation board and the steel fiber reinforced concrete outer leaf panel are subjected to sandblasting roughening treatment, so that the roughness Ra reaches 1.6-3.2 μm; Polymer cement mortar is injected into the joint between the insulation board and the steel fiber reinforced concrete outer leaf panel from bottom to top 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, and the mass per unit area of the alkali-resistant glass fiber mesh reinforcement layer is ≥160 g / m 2 .

[0013] In some optional embodiments, when the foam glass layer and the insulation board are connected, 80-120 g / m 2 of silane coupling agent is brushed on the adjacent sides of the foam glass layer and the insulation board to form an active interface layer; Isocyanate prepolymer and polyol curing agent are mixed at a volume ratio of 1:0.8-1.2 to obtain polyurethane structural adhesive, and 1-3% of nano-silicon dioxide fumed silica and 0.5-1% of flame-retardant phosphate ester compound by mass of the polyurethane structural adhesive are added and uniformly mixed; The 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; A stainless steel wire mesh is embedded before the polyurethane structural adhesive is cured.

[0014] The beneficial effects of the present application are: the prefabricated building light energy-saving wallboard provided by the present application comprises upper and lower outer hanging wallboards arranged in the up-down direction, a continuous U-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 each comprise a paint layer, a foamed glass layer, a thermal insulation board and a steel fiber reinforced concrete outer leaf board connected in sequence; the steel fiber reinforced concrete outer leaf boards of the upper outer hanging wallboard and the lower outer hanging wallboard are connected with the outer hanging convex beams of the structural beam respectively. The prefabricated building light energy-saving wallboard and the construction method provided by the present application can form a gradient thermal insulation structure system to improve the thermal insulation performance by connecting the paint layer, the foamed glass layer, the thermal insulation board and the steel fiber reinforced concrete outer leaf board in sequence to form the upper outer hanging wallboard and the lower outer hanging wallboard, and the prefabricated degree of the modularization is high, the construction is convenient and the construction efficiency is high, meanwhile, the graphene reinforced aerogel layer is filled in the continuous U-shaped connecting joint formed between the lower end surface of the upper outer hanging wallboard and the upper end surface of the lower outer hanging wallboard to realize the triple sealing of air tightness, water tightness and thermal resistance, and the prefabricated building light energy-saving wallboard has the advantages of good sealing effect and long service life. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0016] Figure 1 The cross-sectional structure schematic diagram of the prefabricated building light energy-saving wallboard provided by the embodiments of the present application connected with the outer hanging convex beams of the structural beam is shown in the figure. Figure 2 The cross-sectional structure schematic diagram of the prefabricated building light energy-saving wallboard provided by the embodiments of the present application when the upper outer hanging wallboard and the lower outer hanging wallboard are spliced is shown in the figure. Figure 3 The cross-sectional structure schematic diagram of the prefabricated building light energy-saving wallboard provided by the embodiments of the present application when the upper outer hanging wallboard and the lower outer hanging wallboard are connected by the graphene reinforced aerogel layer is shown in the figure.

[0017] In the figure: 100, upper outer hanging wallboard; 101, upper section; 110, lower outer hanging wallboard; 111, lower section; 120, paint layer; 130, foam glass layer; 140, insulation board; 150, steel fiber concrete outer leaf board; 160, polyester ammonia structural adhesive layer; 170, polymer cement mortar layer; 180, glass fiber reinforcement; 200, graphene reinforced aerogel layer; 210, embedded rod; 220, angle steel; 230, fixed 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, outer hanging convex beam. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0020] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0021] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the application is used, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0022] In addition, the terms "horizontal", "vertical", "overhang" and the like are not intended to mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that it is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0023] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0024] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only means that the horizontal height of the first feature is less than that of the second feature.

[0025] The features and performances of the prefabricated building light energy-saving wallboard and construction method of the present application are further described in detail below in combination with the embodiments.

[0026] As Figure 1 , Figure 2 and Figure 3As shown, the embodiment of the present application provides a light energy-saving wallboard for fabricated building, which comprises an upper outer hanging wallboard 100 and a lower outer hanging wallboard 110 arranged in sequence, the lower end surface of the upper outer hanging wallboard 100 is provided with two continuously connected inverted U-shaped upper joints 101, the upper end surface of the lower outer hanging wallboard 110 is provided with two continuously connected inverted inverted U-shaped lower joints 111, and the two continuously connected U-shaped connecting joints are formed between the lower end surface of the upper outer hanging wallboard 100 and the upper end surface of the lower outer hanging wallboard 110, and the connecting joints are filled with a graphene reinforced aerogel layer 200, the upper outer hanging wallboard 100 and the lower outer hanging wallboard 110 each comprise a paint layer 120, a foam glass layer 130, a thermal insulation board 140 and a steel fiber reinforced concrete outer leaf board 150 connected in sequence; the thermal insulation board 140 and the foam glass layer 130 are bonded by a polyester ammonia structural adhesive layer 160, and the steel fiber reinforced concrete outer leaf board 150 and the thermal insulation board 140 are bonded by a polymer cement mortar layer 170; the top and bottom of the steel fiber reinforced concrete outer leaf board 150 are connected with the top and bottom of the thermal insulation board 140 by the glass fiber reinforced material 180 arranged at intervals; the polyester ammonia structural adhesive layer 160 is prepared by mixing isocyanate prepolymer and polyol curing agent at a volume ratio of 1:0.8-1.2 and then curing, and the polymer cement mortar layer 170 is prepared by mixing cement, quartz sand and redispersible latex powder at a mass ratio of 1:2:0.15-0.3; the steel fiber reinforced concrete outer leaf board 150 is prepared by adding glass fiber and polypropylene fiber to concrete, the addition amount of the glass fiber is 1-3% of the volume of the concrete, the addition amount of the polypropylene fiber is 0.1-0.5% of the volume of the concrete, the diameter of the glass fiber is 10-20μm, and the length of the glass fiber is 12-36μm, the fiber is used in the steel fiber reinforced concrete outer leaf board 150 to replace part of the aggregate, which can effectively improve the bending and cracking resistance of the outer leaf board, and reduce the dry density of the outer leaf board to 1800-2000kg / m 3 , which is 15-20% lower than that of ordinary concrete. The material of the thermal insulation board 140 is selected from non-combustible insulation materials, the thermal conductivity (25℃) is ≤0.054W / (m·K), the mechanical strength is high, the bending load resistance is ≥3000KN, the adhesion to concrete is strong, ≥0.2Mpa, and the water absorption is low. The foam glass layer 130 is made of glass waste by foaming and sintering, a large number of closed pores are formed in the foam glass layer 130, and the dry density is generally between 150kg / m 3 -600kg / m 3 , which is much lower than that of traditional wall materials, thereby directly reducing the overall weight of the wallboard.

[0027] The steel fiber reinforced concrete outer leaf 150 of the upper and lower outer hanging wallboards 100 and 110 is respectively pre-buried with pre-buried rod members 210 arranged at intervals, one end of the pre-buried rod members 210 extending out of the steel fiber reinforced concrete outer leaf 150, the top and bottom surfaces of the outer hanging convex beam 310 of the structural beam 300 are respectively connected with fixed steel plates 230 arranged at intervals, each fixed steel plate 230 is connected with pre-buried welded hooks 240 arranged at intervals and pre-buried in the outer hanging convex beam 310, the fixed steel plates 230 on the top and bottom surfaces of the outer hanging convex beam 310 are respectively connected with an angle steel 220, the pre-buried rod members 210 connected with the upper and lower outer hanging wallboards 100 and 110 respectively pass through and connect the angle steels 220 on the top and bottom surfaces of the outer hanging convex beam 310 through nuts; the connecting joint between the upper and lower outer hanging wallboards 100 and 110, the two angle steels 220 and the end surface of the outer hanging convex beam 310 are filled with an elastic sealant layer 250, the outer wall of the upper outer hanging wallboard 100, the top of the outer hanging convex beam 310 and the outer wall of the structural beam 300 are filled with an upper cement mortar layer 260, the outer wall of the lower outer hanging wallboard 110, the bottom of the outer hanging convex beam 310 and the outer wall of the structural beam 300 are filled with a lower cement mortar layer 270, and the top surface of the upper cement mortar layer 260 and the bottom surface of the lower cement mortar layer 270 are respectively connected with cover plates 280.

[0028] The embodiment of the present application also provides a construction method of the above-mentioned fabricated building light-weight energy-saving wallboard, which comprises the following steps: Step one, the upper and lower outer hanging wallboards 100 and 110 are pre-processed in a factory, the upper and lower outer hanging wallboards 100 and 110 are composed of a paint layer 120, a foam glass layer 130, a thermal insulation board 140 and a steel fiber reinforced concrete outer leaf 150 in sequence to form a gradient thermal insulation-structure integrated system, the steel fiber reinforced concrete outer leaf 150 is pre-buried with pre-buried rod members 210 arranged at intervals, one end of the pre-buried rod members 210 extending out of the steel fiber reinforced concrete outer leaf 150, and glass fiber reinforcing members 180 are pre-buried at the top and bottom of the steel fiber reinforced concrete outer leaf 150, so that one end of the glass fiber reinforcing members 180 extends out of the steel fiber reinforced concrete outer leaf 150; 1.1, the connection between the thermal insulation board 140 and the steel fiber reinforced concrete outer leaf 150 comprises the following steps: A mechanical embedded structure is formed by pre-opening an inverted trapezoidal notch at the joint of the thermal insulation board 140, the notch depth is 1 / 3-1 / 2 of the thickness of the thermal insulation board 140, the width of the upper edge of the trapezoidal notch is 20-30 mm, and the width of the lower edge is 15-25 mm; The adjacent side surfaces of the thermal insulation board 140 and the steel fiber reinforced concrete outer leaf 150 are subjected to sandblasting roughening treatment, so that the surface roughness Ra reaches 1.6-3.2 μm; The thermal insulation board 140 is attached to the steel fiber reinforced concrete outer leaf 150, and the thermal insulation board 140 and the steel fiber reinforced concrete outer leaf 150 are connected by the glass fiber reinforcement 180 arranged at intervals, so that the glass fiber reinforcement 180 with small density and large tensile strength can reduce the overall weight of the wallboard, reduce the hoisting difficulty, and increase the structural load; The polymer cement mortar layer 170 is obtained by injecting polymer cement mortar from bottom to top at a pressure of 0.2-0.5 MPa into the joint between the thermal insulation board 140 and the steel fiber reinforced concrete outer leaf 150 for curing; the polymer cement mortar layer 170 is prepared by mixing cement, quartz sand and redispersible latex powder at a mass ratio of 1:2:0.15-0.3, and the width of the polymer cement mortar joint is 10-20 mm; The alkali-resistant glass fiber mesh reinforcement layer is inserted before the initial setting of the polymer cement mortar, and the mass per unit area of the alkali-resistant glass fiber mesh reinforcement layer is ≥160 g / m 2 The mesh size of the alkali-resistant glass fiber mesh reinforcement layer is 4 mm x 4 mm; During the curing stage, the environmental humidity is kept at ≥90%, the temperature is 20±5℃, and the curing period is not less than 7 days.

[0029] Through the synergistic effect of the glass fiber mesh reinforcement layer and the polymer cement mortar, the bonding strength retention rate is ≥85% after 50 freeze-thaw cycles, which is significantly better than ordinary steel connecting pieces; at the same time, the temperature deformation adaptability of the glass fiber in the glass fiber mesh reinforcement layer is strong, the three-dimensional random distribution of the fiber gives the joint elastic deformation ability, which can absorb the thermal expansion and cold contraction displacement of ±3 mm, avoiding stress concentration caused by rigid connection; the cost of glass fiber is low, the unit price of material is 40-50% lower than that of stainless steel, and there is no need for maintenance of corrosion-resistant coating, the whole life cycle cost is reduced by more than 25%, the fireproof performance is good, the melting point of alkali-resistant glass fiber is >1000℃, combined with the polyurethane structural adhesive (oxygen index ≥28%) between the foam glass layer 130 and the thermal insulation board 140, it can reach the A2 level fireproof standard of GB8624-2012.

[0030] 1.2, the connection between the foam glass layer 130 and the thermal insulation board 140 includes the following steps: The sawtooth engagement structure is pre-processed on the joint surface of the foam glass layer 130 to form a physical interlocking enhanced interface with the polyurethane structural adhesive, which can increase the shear strength by 50-70%; the tooth depth of the sawtooth engagement structure is 2-4 mm, the tooth pitch is 5-8 mm, and the tooth top angle is 60-90°; 80-120 g / m 2 of silane coupling agent is brushed on the adjacent side of the foam glass layer 130 and the thermal insulation board 140 to form an active interface layer after drying; 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. 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. 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%. 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.

[0031] 1.3 The connection between the paint layer 120 and the foam glass layer 130 includes the following steps: 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. 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; 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 ; Step two, hoist the upper and lower outer hanging wall panels 100 and 110 to the side of the outer hanging protruding beam 310 of the structure beam 300 to be installed, draw an installation positioning control line on the outer hanging protruding beam 310, and embed fixed steel plates 230 at intervals on the top and bottom surfaces of the outer hanging protruding beam 310, respectively, and embed embedded welding hooks 240 at intervals on the top and bottom of the outer hanging protruding beam 310, respectively, and each fixed steel plate 230 is connected with a corresponding set of embedded welding hooks 240 arranged at intervals; Step three, fill the graphene reinforced aerogel on the upper end surface of the lower outer hanging wall panel 110, and then splice and bond with the lower end surface of the upper outer hanging wall panel 100, so that the graphene reinforced aerogel layer 200 formed by the solidification of the graphene reinforced aerogel connects the lower end surface of the upper outer hanging wall panel 100 and the upper end surface of the lower outer hanging wall panel 110, and the positions, elevations, embedded welding hooks 240 and fixed steel plates 230 of the structure beam 300 and the outer hanging protruding beam 310 are measured Step four, connect the upper and lower outer hanging wall panels 100 and 110 with the structure beam 300, including the following steps: Connect angle steels 220 on the top and bottom surfaces of the outer hanging protruding beam 310 of the structure beam 300, respectively, so that the two angle steels 220 are connected with the fixed steel plates 230 on the top and bottom of the outer hanging protruding beam 310, respectively, and the embedded rod members 210 embedded in the upper and lower outer hanging wall panels 100 and 110 pass through and connect the two angle steels 220 through nuts; Fill elastic sealant between the connection joints of the upper and lower outer hanging wall panels 100 and 110, and between the two angle steels 220 and the end surfaces of the outer hanging protruding beam 310 to obtain an elastic sealant layer 250; Construct an upper cement mortar layer 260 between the outer wall of the upper outer hanging wall panel 100, the top of the outer hanging protruding beam 310 and the outer wall of the structure beam 300, and a lower cement mortar layer 270 between the outer wall of the lower outer hanging wall panel 110, the bottom of the outer hanging protruding beam 310 and the outer wall of the structure beam 300; Connect a cover plate 280 on the top surface of the upper cement mortar layer 260 and the bottom surface of the lower cement mortar layer 270; Perform structural and functional inspection and acceptance of the prefabricated building light energy-saving wall panel.

[0032] The prefabricated building light energy-saving wallboard and construction method provided by the embodiment of the application are formed by sequentially connecting the paint layer 120, the foam glass layer 130, the insulation board 140 and the steel fiber concrete outer leaf plate 150 to form the upper and lower outer hanging wallboards 100 and 110, splicing the bottom end of the upper outer hanging wallboard 100 and the top end of the lower outer hanging wallboard 110 through the continuously connected few-shaped connecting joints, and filling the graphene reinforced aerogel layer 200 in the connecting joint splices to connect the upper and lower outer hanging wallboards 100 and 110, so that the upper and lower outer hanging wallboards 100 and 110 are connected through the gradient insulation and the graphene reinforced aerogel layer 200, the heat transfer coefficient is reduced to 0.21 W / (m 2 ·K) to break through the bottleneck of traditional technology, the graphene reinforced aerogel layer 200 is filled in the continuously connected few-shaped connecting joints at the bottom end of the upper outer hanging wallboard 100 and the top end of the lower outer hanging wallboard 110, which can significantly improve the freeze-thaw resistance and shear resistance of the connecting joint and the graphene reinforced aerogel layer 200 system, and greatly prolong the service life, and the paint layer 120, the foam glass layer 130, the insulation board 140 and the steel fiber concrete outer leaf plate 150 are sequentially connected to form the upper and lower outer hanging wallboards 100 and 110, which can improve the modular prefabrication rate and improve the construction efficiency and quality of the prefabricated building light energy-saving wallboard.

[0033] In the embodiment of the application, the pre-embedded rod 210 is arranged in the upper and lower outer hanging wallboards 100 and 110, the pre-embedded welded hooks 240 are arranged at the top and bottom of the outer hanging lug beam 310, the pre-embedded rod 210 and the pre-embedded welded hooks 240 are connected through the connecting angle steel 220 and the fixed steel plate 230, then the elastic sealant layer 250 is constructed between the connecting joints of the upper and lower outer hanging wallboards 100 and 110, the two angle steels 220 and the end surface of the outer hanging lug beam 310, the upper cement mortar layer 260 is constructed between the outer wall of the upper outer hanging wallboard 100, the top of the outer hanging lug beam 310 and the outer wall of the structural beam 300, the lower cement mortar layer 270 is constructed between the outer wall of the lower outer hanging wallboard 110, the bottom of the outer hanging lug beam 310 and the outer wall of the structural beam 300, and the 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 and lower outer hanging wallboards 100 and 110 to the outer hanging lug beam 310 of the structural beam 300, and effectively improve the protection effect of the graphene reinforced aerogel layer 200 in the connecting joint between the upper and lower outer hanging wallboards 100 and 110.

[0034] The continuously few-shaped in the embodiment of the application refers to at least two sequentially connected few-shaped.

[0035] The embodiments described above are only part of the embodiments of the present application, rather than all the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application.

Claims

1. A prefabricated building light energy-saving wallboard, characterized in that, It includes upper and lower externally hung wallboards arranged in up and down, the lower end surface of the upper externally hung wallboard and the upper end surface of the lower externally hung wallboard enclose a continuous zigzag joint, the joint is filled with a graphene reinforced aerogel layer, the upper and lower externally hung wallboards each include a paint layer, a foam glass layer, an insulation board and a steel fiber reinforced concrete outer leaf board connected in turn; the steel fiber reinforced concrete outer leaf board of the upper and lower externally hung wallboards is connected with the externally hung convex beam of the structure beam respectively.

2. The assembled building light energy-saving wall panel according to claim 1, characterized in that, The polyester ammonia structural adhesive layer is prepared by mixing isocyanate prepolymer and polyol curing agent at a volume ratio of 1:0.8-1.2 and then curing.

3. The assembled light energy-saving wall of building according to claim 1, characterized in that, The steel fiber reinforced concrete outer leaf board and the insulation board are bonded by a polymer cement mortar layer, the top and bottom of the steel fiber reinforced concrete outer leaf board are connected with the top and bottom of the insulation board by a plurality of glass fiber reinforcements respectively; the polymer cement mortar layer is prepared by mixing cement, quartz sand and redispersible latex powder at a mass ratio of 1:2:0.15-0.

3.

4. The assembled light energy-saving wall of building according to claim 1, characterized in that, The steel fiber reinforced concrete outer leaf board is prepared by adding glass fiber to the concrete, and the addition amount of the glass fiber is 1-3% of the volume of the concrete.

5. The assembled light energy-saving wall of building according to claim 1, characterized in that, The steel fiber reinforced concrete outer leaf board is prepared by adding glass fiber and polypropylene fiber to the concrete, the addition amount of the glass fiber is 1-3% of the volume of the concrete, and the addition amount of the polypropylene fiber is 0.1-0.5% of the volume of the concrete.

6. The assembled light energy-saving wall of building according to claim 1, characterized in that, A plurality of embedded rods are embedded in the upper and lower externally hung wallboards respectively, the top surface and the bottom surface of the externally hung convex beam of the structure beam are respectively connected with angle steels, the embedded rods of the upper and lower externally hung wallboards respectively pass through and connect the angle steels of the top surface and the bottom surface of the externally hung convex beam, the top surface and the bottom surface of the externally hung convex beam are respectively provided with fixed steel plates connected with the angle steels, and two fixed steel plates are respectively connected with embedded welding hooks embedded in the externally hung convex beam; the joint between the upper and lower externally hung wallboards, the two angle steels and the end surface of the externally hung convex beam are filled with an elastic sealant layer, the upper cement mortar layer is filled between the outer wall of the upper externally hung wallboard, the top of the externally hung convex beam and the outer wall of the structure beam, and the lower cement mortar layer is filled between the outer wall of the lower externally hung wallboard, the bottom of the externally hung convex beam and the outer wall of the structure beam.

7. The construction method of the fabricated building light-weight energy-saving wall panel according to any one of claims 1 to 6, characterized in that, The method comprises the following steps: Hoisting the upper and lower externally hung wallboards to the side surface of the structure beam; Filling the graphene reinforced aerogel on the upper end surface of the lower externally hung wallboard, and then splicing and bonding with the lower end surface of the upper externally hung wallboard; Connecting the upper and lower externally hung wallboards with the structure beam respectively.

8. The construction method of the fabricated building light-weight energy-saving wall panel according to claim 7, characterized in that, Connecting the upper and lower externally hung wallboards with the structure beam respectively comprises the following steps: Two angle steels are connected to the top surface and bottom surface of the protruding beam of the structural beam respectively, so that the two angle steels are connected with the fixed steel plates embedded in the top and bottom of the protruding beam respectively, and the embedded rod members embedded in the upper and lower outer wall panels pass through and connect the two angle steels respectively; An elastic sealant layer is obtained by filling elastic sealant between the connecting joint between the upper and lower outer wall panels and the end surface between the two angle steels and the protruding beam; An upper cement mortar layer is constructed between the outer wall of the upper outer wall panel, the top of the protruding beam and the outer wall of the structural beam, and a lower cement mortar layer is constructed between the outer wall of the lower outer wall panel, the bottom of the 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. 9.The construction method of the fabricated building light-weight energy-saving wall panel according to claim 7, characterized in that, The upper and lower outer wall panels are connected by a paint layer, a foam glass layer, an insulation board and a steel fiber reinforced concrete outer leaf panel in sequence; When the insulation board and the steel fiber reinforced concrete outer leaf panel are connected, the adjacent surfaces of the insulation board and the steel fiber reinforced concrete outer leaf panel are sandblasted and roughened to a roughness Ra of 1.6-3.2 μm; Polymer cement mortar is injected into the joint between the insulation board and the steel fiber reinforced concrete outer leaf panel from bottom to top at a pressure of 0.2-0.5 MPa for curing; Inserting the alkali-resistant glass fiber mesh reinforcement layer before the initial setting of the polymer cement mortar, the unit area mass of the alkali-resistant glass fiber mesh reinforcement layer is ≥160 g / m 2 . 10.The construction method of the fabricated building light-weight energy-saving wall panel according to claim 7, characterized in that, The foam glass layer and the thermal insulation board are connected, and 80-120 g / m 2 of silane coupling agent is brushed on the adjacent side of the foam glass layer and the thermal insulation board to dry to form an active interface layer. Isocyanate prepolymer and polyol curing agent are mixed in a volume ratio of 1:0.8-1.2 to obtain polyurethane structural adhesive, and 1-3% of nano silica fume and 0.5-1% of flame-retardant phosphate compound by mass of the polyurethane structural adhesive are added and uniformly mixed; The polyurethane structural adhesive is injected into the joint between the foam glass layer and the insulation board and cured at a rate of 200-400 mL / min and a joint width of 15-25 mm; A stainless steel wire mesh is embedded before the polyurethane structural adhesive is cured.

Images