Fabricated hot-bridge-cutting steel frame outer-hung outer wall plate

Abstract

The application relates to the field of buildings, and particularly relates to a fabricated hot-bridge-cutting steel frame externally-hung outer wall plate. The fabricated hot-bridge-cutting steel frame externally-hung outer wall plate comprises a steel frame, a surface mortar layer, a finishing layer, an insulation board layer, a first heat-insulating concrete layer, a second heat-insulating concrete layer, a first steel mesh and a second steel mesh. The steel frame comprises two left-right symmetrical main ribs and a connecting rib connected between the two main ribs. The main rib comprises a first wing plate, a second wing plate and a web, and the web is made of glass fiber reinforced plastic. The second steel mesh is arranged in the steel frame and located on the two second wing plates. The insulation board layer is arranged in the steel frame and connected to the second steel mesh through the second heat-insulating concrete layer. The second heat-insulating concrete layer is arranged in the steel frame and located on the insulation board layer. The first steel mesh is arranged on the two first wing plates, and a part of the bottom surface of the first steel mesh is connected to the second heat-insulating concrete layer. The fabricated hot-bridge-cutting steel frame externally-hung outer wall plate can weaken the heat bridge effect existing in the externally-hung wall plate.

Description

Technical Field

[0001] This application relates to the field of construction, and in particular to a prefabricated thermally broken steel frame external wall panel. Background Technology

[0002] Improving the thermal environment quality of buildings requires eliminating or mitigating thermal bridges in the building structure. Since exterior wall panels must be wind-resistant, concealed beams are often incorporated within them. The concrete used for the wall panels is lightweight concrete, and the concealed beams are typically thin-walled steel beams. The shear-bearing component of the steel beam is its web, the surface of which is parallel to the direction of heat flow that needs to be blocked. Because the thermal conductivity of building steel is as high as 58 W / K·m, the thermal bridging effect created by the steel web is very severe, resulting in a significant loss of the insulation capacity provided by the insulating core panels within the wall panels, failing to meet energy-saving standards. Summary of the Invention

[0003] In view of this, this application provides a prefabricated thermally broken steel frame external wall panel, which can weaken the thermal bridging effect present in the external wall panel.

[0004] To achieve the above objectives, this application employs the following technical solution:

[0005] A prefabricated thermally broken steel frame exterior wall panel, characterized in that it comprises a steel frame, a surface mortar layer, a decorative layer, an insulation board layer, a first insulation concrete layer, a second insulation concrete layer, a first wire mesh, and a second wire mesh; the steel frame includes two main ribs symmetrically arranged on the left and right sides and a connecting rib connecting the two main ribs; each main rib includes a first wing plate and a second wing plate arranged vertically at intervals and a web plate connecting the first wing plate and the second wing plate, the web plate being made of fiberglass; the second wire mesh is disposed in the steel frame and located on the two second wing plates, the insulation board layer is disposed in the steel frame and connected to the second wire mesh through the second insulation concrete layer, the second insulation concrete layer is filled in the steel frame and located on the insulation board layer, the first wire mesh is disposed on the two first wing plates and a portion of the bottom surface of the first wire mesh is connected to the second insulation concrete layer, the surface mortar layer is disposed on the first wire mesh, and the decorative layer is disposed on the surface mortar layer.

[0006] The aforementioned prefabricated thermally broken steel frame exterior wall panel incorporates an insulation layer, providing thermal insulation properties. Since the insulation layer is parallel to the wall panel surface and perpendicular to the heat flow direction, it also withstands various external forces perpendicular to the panel surface. These external forces act on the web of the wall panel through the first wire mesh within the panel surface. The web plays a primary role in resisting these external forces, and the use of fiberglass reinforced plastic (FRP) sheets for the web weakens thermal bridging. FRP has a thermal conductivity below 0.3 W / K·m, while its tensile and compressive strength exceeds 400 MPa, its compressive strength exceeds 150 MPa, and its shear strength is above 10 MPa. This design effectively weakens the thermal bridging effect while meeting the design requirements for the mechanical properties of the exterior wall panel.

[0007] In some embodiments, the first and second insulating concrete layers are cement porous polymer concrete, wherein the aggregate of the cement porous polymer concrete is one or a combination of foamed EPS particles, foamed XPS, PU, ​​EVA, foamed phenolic resin and molded foamed polystyrene powder.

[0008] In some embodiments, the insulation layer is one or a combination of PU, EPS, XPS, EVA, EPP, EPE foam board, rock wool board, glass wool board, phenolic foam board and nano-silica foam board.

[0009] In some embodiments, the finishing layer is one or a combination of a tile veneer layer and a paint layer.

[0010] In some embodiments, the connecting rib includes two sets of end ribs disposed at the front and rear ends of the main rib and a middle rib disposed in the middle of the main rib.

[0011] In some embodiments, the first wing plate, second wing plate, end ribs, and middle ribs of the steel frame are made of one or a combination of structural steel, C-shaped steel, flat steel, steel pipe, wire mesh, reinforcing bars, fiberglass sheets, and fiberglass profiles.

[0012] In some embodiments, the reinforcing material of the fiberglass is one or a combination of glass fiber, carbon fiber, boron fiber, aramid fiber, alumina fiber, and silicon carbide fiber, and the binder is one of polyester resin, epoxy resin, and phenolic resin. To improve fire resistance, the fiberglass used can be a heat-resistant fiberglass with a heat resistance of 300ºC using a phenolic resin binder.

[0013] In some embodiments, the first and second wing plates are connected to the web plate by one or a combination of resin chemical bonding, riveting, and bolting.

[0014] As can be seen from the above technical solution, this application has at least the following advantages and positive effects:

[0015] 1. This application presents a scientific, reasonable, effective, and easy-to-implement method for simultaneously meeting technical requirements regarding the bending and compressive strength and heat transfer coefficient of exterior wall cladding panels. It significantly and reliably improves building energy efficiency over time. In severe winters, it prevents condensation on steel structures, and in southern summers with natural ventilation, it ensures that indoor temperatures are lower than outdoor temperatures, meeting thermal engineering standards.

[0016] 2. The mechanical properties of the fiberglass web will not decrease after meeting the fire resistance limit time of 1 hour, and post-disaster repair is simple.

[0017] 3. The production process is simple and easy to manufacture, meeting the needs of steel structure engineering. It easily meets the requirements for wind resistance, earthquake resistance, and pressure resistance.

[0018] 4. Meets the requirements of prefabricated construction, is convenient to transport and easy to install. This is beneficial for reducing project costs.

[0019] 5. The wall panel insulation concrete makes extensive use of waste foamed plastics, resulting in significant environmental benefits.

[0020] 6. Provide a high-quality living environment that is warm in winter and cool in summer, achieve building energy conservation, and promote the modernization of the construction industry. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of Embodiment 1 of this application;

[0022] Figure 2 This is a schematic diagram of the steel frame structure in Embodiment 1 of this application;

[0023] Figure 3 This is a cross-sectional view of the main rib 1 and the C-shaped steel main rib in the embodiment of this application.

[0024] Labeling Explanation: 1. Steel frame; 11. Main rib; 111. First wing plate; 112. Second wing plate; 113. Web plate; 12. End rib; 13. Middle rib; 2. Surface mortar layer; 3. Finishing layer; 4. Insulation board layer; 5. First insulating concrete layer; 6. Second insulating concrete layer; 7. First wire mesh; 8. Second wire mesh; Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this application clearer, the application will be described in further detail below with reference to the accompanying drawings. The terminology used in the embodiments section of this application is only for explaining specific embodiments and is not intended to limit the application.

[0026] Example 1:

[0027] This embodiment provides a prefabricated thermally broken steel frame external wall panel, including a steel frame 1, a surface mortar layer 2, a decorative layer 3, an insulation board layer 4, a first thermally insulated concrete layer 5, a second thermally insulated concrete layer 6, a first wire mesh 7, and a second wire mesh 8; the steel frame 1 includes two main ribs 11 arranged symmetrically on the left and right sides and a connecting rib connecting the two main ribs 11; each main rib 11 includes a first wing plate 111 and a second wing plate 112 arranged vertically at intervals, and a web plate 113 connecting the first wing plate 111 and the second wing plate 112, and a web plate 113 connecting the first wing plate 111 and the second wing plate 112. The board 113 is made of fiberglass; the second wire mesh 8 is set in the steel frame 1 and located on the two second wing plates 112; the insulation board layer 4 is set in the steel frame 1 and connected to the second wire mesh 8 through the second insulation concrete layer 6; the second insulation concrete layer 6 is filled in the steel frame 1 and located on the insulation board layer 4; the first wire mesh 7 is set on the two first wing plates 111 and a portion of the bottom surface of the first wire mesh 7 is connected to the second insulation concrete layer 6; the surface mortar layer 2 is set on the first wire mesh 7; and the finishing layer 3 is set on the surface mortar layer 2. The connecting ribs include two sets of end ribs 12 set at the front and rear ends of the main rib 11 and a middle rib 13 set in the middle of the main rib 11.

[0028] A project requires prefabricated thermally broken exterior wall panels. Each panel is 6m long, 60cm wide, and 13cm thick. The allowable wind suction standard value is 3.8KN / m², and the design value of the wall panel's thermal resistance R ≥ 3.0K·m² / W. The fire resistance limit time is ≥ 1.0h. The compressive strength of the wall panel is ≥ 2.1MPa.

[0029] The thermal bridge is mitigated by replacing the composite beam of two C120×50×3 composite beams with a 5mm thick fiberglass plate as the web 113 and 75mm×6mm galvanized steel plates as the first flange 111 and the second flange 112. See the wall panel section for details. Figure 1 See the main rib cross-sectional diagram. Figure 3 .

[0030] 1. Thermal bridge analysis and thermal calculations

[0031] Depend on Figure 1 It can be seen that the heat flow passes through two paths when it passes in a direction perpendicular to the plate surface:

[0032] The first path passes sequentially along a 0.01m thick mortar layer (δ1=), a 0.05m thick insulating concrete layer (δ2=), and a 0.07m thick insulating board layer (δ3=), through the external wall panel. The thermal resistance is R1.

[0033] The second path passes sequentially through the external wall panel along a 0.01m thick decorative mortar layer (δ1=) and a fiberglass web with a heat transfer calculation length (δ4=) of 0.07m. The thermal resistance is R2.

[0034] Given the following thermal conductivity parameters: mortar layer with wire mesh facing λ1 = 1.74 W / K·m; insulating concrete λ2 = 0.1 W / K·m; insulating board layer λ3 = 0.02 W / K·m; 5mm thick fiberglass web λ4 = 0.3 W / K·m; and building steel 58.2 W / K·m. The parallel thermal resistance coefficients for the two parallel circuits are: k1 = 600 / 590 = 1.017; k2 = 600 / 2 x 5 = 60.

[0035] The thermal resistance of the first path, R1 = K1(δ1 / λ1 + δ2 / λ2 + δ3 / λ3) = 1.017 × (0.01 / 1.74 + 0.05 / 0.1 + 0.07 / 0.02) = 4.01 kJ·m ² / w.

[0036] The thermal resistance of the second path, R2 = k2(δ1 / λ1 + δ4 / λ4) = 60 × (0.01 / 1.74 + 0.12 / 0.3) = 24.34 k·m ² / w.

[0037] The thermal resistance of the two parallel circuits is R = 1 / (1 / R1 + 1 / R2) = 1 / (1 / 4.01 + 1 / 24.34) = 3.44 K·m ² / w.

[0038] Two C-shaped steel sections are combined to form one main rib, and there are a total of four C120×50×3 main ribs within the wall panel. With this steel web configuration: k2' = 600 / (4×3) = 50; k1' = 600 / 588 = 1.02

[0039] The thermal resistance of the first path, R'1, is calculated as follows: R'1 = 1.02 × (0.01 / 1.74 + 0.05 / 0.1 + 0.07 / 0.2) = 4.02 m ² ·k / w .

[0040] The thermal resistance of the second path, R2' = k2'(δ1 / λ1 + δ4 / λ4), is 50 × (0.01 / 1.74 + 0.12 / 58.2) = 0.39m. ² ·k / w.

[0041] The thermal resistance of the two parallel circuits is R' = 1 / (1 / R1 + 1 / R2') = 1 / (1 / 4·02 + 1 / 0.39) = 0.36 m ² ·k / w.

[0042] It can be seen that when using fiberglass webs, the thermal resistance of this type of external wall panel can be achieved at 3.44m. ² ·k / w >3.0m ² ·K / w ， It meets the design requirements.

[0043] When C-shaped steel is used with a steel web, the thermal resistance is less than 0.36 kJ / m. ² / w, resulting in a 90% loss of thermal resistance. This demonstrates that using composite steel profiles with fiberglass webs can significantly reduce thermal bridging in the wall panel. This bridging measure can increase the thermal resistance of this type of external wall panel by nearly 10 times.

[0044] 2. Web stress analysis and wall panel compressive strength calculation

[0045] 2.1 Wind load

[0046] Permissible suction power standard value: w=3.8KN / m ²

[0047] Line load: q = 0.6m × 3.8kN / m² = 2.28kN / m 。 Under wind pressure, the main ribs of the external wall panel are calculated as simply supported beams at both ends, with a calculated span of 5.9m. 。 The deflection at the point of maximum bending moment in the middle should not exceed 1 / 200 of the span = 590 ÷ 200 = 2.95 (cm).

[0048] The main ribs are constructed using four galvanized flat steel bars, each with a cross-sectional dimension of 70mm × 6mm, and two fiberglass plates, each with a cross-sectional dimension of 130mm × 5mm, forming the web. The cross-section is shown in the figure. Figure 3 Fiberglass has a low modulus of elasticity and is not included in the calculation of the moment of inertia of the beam section. The moment of inertia of the composite beam section is | =S·r ² =4×7.0×0.6×6 ² =604.8 (cm) 4 ).

[0049] Maximum deflection of the wall panel ε1= =5×228×5.9 4 / 384×2.06×604.8=2.88(cm)<2.95(cm).

[0050] It can be seen that the bending deformation meets the design requirements.

[0051] When the external wall panel uses 4 C120×50×3 main ribs, see the cross-section. Figure 3 .

[0052] Given that the moment of inertia of section C120×50×3 is | =150.05cm 4 The maximum bending deformation ε of the wall panel under wind pressure. 。 =5×228×5.9 4 / 384×2.06×4×150.0=2.91 (cm), 2.91 (cm) < 2.95 (cm). Therefore, ε1 < ε。 The bending deformation did not increase after replacement.

[0053] Shear resistance calculation is performed based on the fiberglass web being subjected to shear alone:

[0054] The maximum shear force at the end is V = 2.28 kN / m × 3 m = 6.84 kN

[0055] Web cross-sectional area S = 2 x 120 mm x 5 mm = 1200 mm ²

[0056] Maximum shear stress σ = V / S = 6840N ÷ 1200mm ² = 5.7N / mm ²

[0057] The design value of the shear strength of FRP sheet is based on 10MPa: [σ]=10MPa=10N / mm ² 5.7N / mm ² <10N / mm².

[0058] It can be seen that the shear strength of the fiberglass web meets the requirements.

[0059] 2.2 Compressive strength perpendicular to the wall panel surface

[0060] According to the design value of compressive strength σ 。 =2.1MPa 。

[0061] The board is 0.6 meters wide, and the pressure P that the board surface bears per meter of length is... 。 =126×10 4 N

[0062] The bearing area of ​​the fiberglass web is S = 2 × 1000 mm × 5 mm = 1 × 10 4 mm ²

[0063] The compressive stress f borne by the fiberglass web 。 = =126N / mm²=126MPa.

[0064] The compressive strength of fiberglass sheets is generally between 150 and 500 MPa; a fiberglass sheet with a compressive strength of 150 MPa is selected. 126 MPa < [σ] = 150 MPa

[0065] It can be seen that the compressive strength perpendicular to the plate surface can meet the design requirements.

[0066] Replacing the main steel ribs with composite steel sections featuring fiberglass webs significantly improves the thermal insulation performance of prefabricated steel-framed exterior wall panels without compromising mechanical properties or fire resistance. This approach plays a positive role in promoting prefabricated construction, improving building thermal environment quality, and achieving further energy conservation. The thermal resistance of the exterior walls of prefabricated residential buildings includes the exterior wall panels, inner wall panels, and surface heat exchange resistance, which can achieve the desired thermal resistance R. 。 = 3.44 + 0.5 + 0.2 = 4.14 m ² •k / w, meaning the heat transfer coefficient of the exterior wall is K≤0.25W / m ² ·K 。 Prefabricated houses can easily achieve warmth in winter and coolness in summer.

[0067] Example 2:

[0068] A project requires prefabricated thermally broken exterior wall panels. The panels are 4.8m long, 60cm wide, and 11cm thick. The permissible wind suction standard value is 3.8kN / m. ² The design thermal resistance of the wall panel is R > 2.50m. ² • k / w. Fire resistance limit > 1.0 hour and the fire performance rating of the insulation board should be Class A. Surface compressive strength of the wall panel ≥ 2.1 MPa 。 Unlike Example 1, a composite beam with a 4mm thick fiberglass plate as the web and 60mm×6mm galvanized flat steel as the flange was used instead of two C100×50×2.5 composite beams to reduce thermal bridging.

[0069] Thermal bridge analysis and heat transfer calculation:

[0070] The heat flow passes through two paths perpendicular to the plate surface:

[0071] The first path passes sequentially along a 0.01m thick finishing mortar layer (δ1=), a 0.05m thick insulating concrete layer (δ2=), and a 0.05m thick insulating board layer (nano-silica foam board) through the exterior wall panel. The thermal resistance is R. 1。

[0072] The second path passes sequentially along the 0.01m thick finishing mortar layer (δ1=) and the 0.1m thick fiberglass web (δ4=) through the external wall panel. The thermal resistance is R2.

[0073] Given: The thermal conductivity of the wire mesh facing mortar layer is λ1 = 1.74 W / K·m 。 The thermal conductivity of insulating concrete is λ2 = 0.1 W / K·m. The thermal conductivity of insulating concrete is λ3 = 0.02 W / m·K. 。The thermal conductivity of a 4mm thick fiberglass web is λ4 = 0.3 W / m·K. The thermal conductivity of structural steel is 58.2 W / m·K. The parallel thermal resistance coefficients for the two paths are k1 = 600 ÷ 592 = 1.013 and k2 = 600 ÷ 8 = 75. 。 The thermal resistance of the first path is R1 = k1 ( + + )=1.013×(0.01 / 1.74+0.05 / 0.1+0.05 / 0.02)=3.025m ² ·k / w .

[0074] The thermal resistance of the second path is R2=k2 ( + )=75×(0.01 / 1.74+0.1 / 0.3)=25.43m ² ·k / w .

[0075] The thermal resistance of the wall panel is the parallel thermal resistance of two circuits, R = 1 / (1 / R1 + 1 / R2) = 1 / (1 / 3.025 + 1 / 25.43) = 2.7m ² ·k / w.

[0076] When using C-shaped steel main ribs, with a web thickness of 4 × 2.3 = 9.2 mm:

[0077] The thermal resistance coefficients of the two paths are k'1 = 600 ÷ 590.8 = 1.015, k'2 = 600 ÷ 9.2 = 65.2. The thermal resistance of the first path is R'1 = k'1 ( + + )=1.015×(0.01 / 1.74+0.05 / 0.1+0.05 / 0.02)=3.037m ² ·k / w.

[0078] The thermal resistance of the second path is R'2 = k'2 ( + )=65.2×(0.01 / 1.74+0.1 / 58.2)=0.486㎡·k / w

[0079] The thermal resistance of the wall panel is the parallel thermal resistance of two circuits, R' = 1 / (1 / R'1 + 1 / R'2) = 0.42 m²·k / w.

[0080] When using fiberglass web panels, the thermal resistance of this model of external wall panel can reach 2.7m²·k / w > 2.5m. ² ·k / w.

[0081] It can be concluded that the heat transfer performance meets the design requirements.

[0082] When using C-shaped steel, the web is made of steel plate, and the thermal resistance of the wall panel is less than 0.42 m ² ·k / W. Using a steel web results in a loss of 84% of the thermal resistance value. After using a fiberglass web, the thermal resistance value of this type of external wall panel can be increased to 6.4 times.

[0083] 2. Force analysis of the main ribs and calculation of the compressive strength of the wall panel

[0084] 2.1 Force analysis of the main ribs

[0085] Allowable standard value of wind suction: w = 3.8 kN / ㎡

[0086] Line load: q = 3.8 kN / ㎡ × 0.6 m = 2.28 kN / m.

[0087] Under the action of wind suction, the main ribs of the external wall panel are calculated as simply supported beams at both ends, and the calculated span is 4.8 m.

[0088] The deflection at the maximum bending moment in the middle should not be greater than 1 / 200 of the span = 480 cm / 200 = 2.4 cm.

[0089] Use a combined beam with four galvanized flat steels with a cross-sectional size of 60 mm × 6 mm as the main rib flanges and two fiberglass plates with a cross-sectional size of 100 mm × 8 mm as the webs for the two main ribs on both sides. The elastic modulus of the fiberglass is relatively low and is not included in the calculation of the moment of inertia of the beam section. The moment of inertia of the combined beam I = 4·S·r ² = 4 × 6 × 0.6 × 5 ² = 360 (cm 4 )

[0090] The maximum deflection of the wall panel ε = = = 2.13 (cm) < 2.4 (cm).

[0091] It can be seen that the bending deformation meets the design requirements.

[0092] This type of external wall panel uses 4 C100x50×2.5 as the main ribs, and the moment of inertia I = 4 × 83.92 = 335.68 (cm).

[0093] The maximum bending deformation value ε in the middle of the wall panel = = 2.28 (㎝) < 2.4 (cm) = 480 / 200.

[0094] The bending deformation meets the requirements. After using a fiberglass web, the bending deformation will not increase.

[0095] 2.2 Shear strength of the fiberglass web

[0096] The maximum shear force V at the end = = 5.47 KN

[0097] The cross-sectional area of ​​the web is S = 2 × 100 mm × 4 mm = 800 mm² ²

[0098] Maximum shear stress σ = 5470 N ÷ 800 mm² = 6.8 N / mm ²

[0099] The design value of the shear strength of the fiberglass sheet is calculated based on 10MPa: 6.8N / mm² ² < [σ]=10N / mm ² .

[0100] It can be seen that the shear strength of the fiberglass web meets the design requirements.

[0101] 2.3 Compressive strength of the wall panel: The design compressive strength in the direction perpendicular to the panel surface is σ1 = 2.1 MPa.

[0102] The wall panel is 0.6m wide, and each meter of the panel surface bears a pressure P. 。 =S 。 σ1 = 600mm × 1000mm × 2.1N / mm ² =126×10 4 N.

[0103] The bearing cross-sectional area of ​​the fiberglass web is S = 2 × 1000 + 600 mm × 4 mm = 1.04 × 10 4 mm ² .

[0104] The fiberglass web is subjected to compressive stress f 。 = = 126 ÷ 1.04 = 121.2 N / mm ² <150N / mm ² .

[0105] The design value for the compressive strength of fiberglass is 150 N / mm. ² .

[0106] It can be seen that the compressive strength of the rear wall panel with fiberglass web meets the design requirements in the vertical direction.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of this application, and are not intended to limit them; although the embodiments of this application have been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A prefabricated thermally broken steel frame external wall panel, characterized in that: The structure includes a steel frame (1), a surface mortar layer (2), a finishing layer (3), an insulation board layer (4), a first insulation concrete layer (5), a second insulation concrete layer (6), a first wire mesh (7), and a second wire mesh (8); the steel frame (1) includes two main ribs (11) arranged symmetrically on the left and right sides and a connecting rib connecting the two main ribs (11); each main rib (11) includes a first wing plate (111) and a second wing plate (112) arranged at intervals on the top and bottom, and a web plate (113) connecting the first wing plate (111) and the second wing plate (112), the web plate (113) being made of fiberglass; the second The wire mesh (8) is set in the steel frame (1) and located on the two second wing plates (112). The heat insulation board layer (4) is set in the steel frame (1) and connected to the second wire mesh (8) through the second heat insulation concrete layer (6). The second heat insulation concrete layer (6) is filled in the steel frame (1) and located on the heat insulation board layer (4). The first wire mesh (7) is set on the two first wing plates (111) and a portion of the bottom surface of the first wire mesh (7) is connected to the second heat insulation concrete layer (6). The surface mortar layer (2) is set on the first wire mesh (7). The finishing layer (3) is set on the surface mortar layer (2).

2. The prefabricated thermally broken steel frame external wall panel according to claim 1, characterized in that: The first heat-insulating concrete layer (5) and the second heat-insulating concrete layer (6) are cement porous polymer concrete, and the aggregate of the cement porous polymer concrete is one or a combination of foamed EPS particles, foamed XPS, PU, ​​EVA, foamed phenolic and molded foamed polystyrene powder.

3. The prefabricated thermally broken steel frame external wall panel according to claim 1, characterized in that: The insulation board layer (4) is one or a combination of PU, EPS, XPS, EVA, EPP, EPE foam board, rock wool board, glass wool board, phenolic foam board and nano-silica foam board.

4. The prefabricated thermally broken steel frame external wall panel according to claim 1, characterized in that: The finishing layer (3) is one of the block veneer layer and the paint layer or a combination thereof.

5. The prefabricated thermally broken steel frame external wall panel according to claim 1, characterized in that: The connecting ribs include two sets of end ribs (12) located at the front and rear ends of the main rib (11) and a middle rib (13) located in the middle of the main rib (11).

6. The prefabricated thermally broken steel frame external wall panel according to claim 5, characterized in that: The first wing plate (111), second wing plate (112), end rib (12) and middle rib (13) of the steel frame (1) are made of one or a combination of structural steel, C-shaped steel, flat steel, steel pipe, wire mesh, reinforcing bar, fiberglass plate and fiberglass profile.

7. The prefabricated thermally broken steel frame external wall panel according to claim 1, characterized in that: The first wing plate (111) and the second wing plate (112) are connected to the web plate (113) by one or a combination of resin chemical bonding, riveting and bolting.

8. The prefabricated thermally broken steel frame external wall panel according to claim 1, characterized in that: The thickness of the web (113) is greater than 4 mm.

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