Lightweight high-strength composite fiber curtain wall keel

Abstract

The utility model discloses a kind of lightweight high-strength composite fiber curtain wall keel, belong to building curtain wall structure technical field.The keel includes composite fiber keel, its section is rectangular hollow structure, from inside to outside in turn is lightweight core layer, interface bonding layer and fiber reinforced composite material outer layer;Composite fiber keel side is connected with aluminum alloy base by mortise and tenon structure and self-tapping screw, aluminum alloy base is assembled with connecting piece, trim strip base by mortise and tenon and hexagon bolt, end detachable installation aluminum alloy decorative strip cover plate, steel glass is equipped in the gap between base and trim strip base, keel lower part side wall is fixed galvanized angle steel.Outer layer can select carbon fiber and other fiber materials, core layer is polyurethane foam or honeycomb aluminum, interface layer is nano SiO2 modified epoxy resin bonding layer.The utility model realizes lightweight and high-strength combination by composite structure design, modular connection promotes installation efficiency by more than 50%, with excellent weather resistance, suitable for high-rise building, large-span and energy-saving curtain wall scene.

Description

Technical Field

[0001] This utility model relates to the field of building curtain wall structure technology, and in particular to a lightweight high-strength composite fiber curtain wall keel. Background Technology

[0002] In the field of building curtain wall structures, the curtain wall keel, as the core component of the support system, directly affects the safety, construction efficiency, and energy-saving effect of the curtain wall. Traditional curtain wall keels mostly use steel or aluminum alloy materials, which, although possessing a certain strength, have significant drawbacks: steel has a large self-weight, such as the density of Q235 steel, leading to an increase in building load, and is susceptible to corrosion, requiring regular maintenance; aluminum alloy, although lightweight, has a high thermal conductivity, easily forming a thermal bridge effect, reducing the building's energy-saving performance. At the same time, both materials have problems such as complex on-site processing procedures and long installation cycles.

[0003] Existing technology CN218911902U discloses a composite keel system for glass curtain walls. This system uses a composite structure combining U-shaped aluminum plates and square steel tubes, connected by an adhesive layer and fixed to embedded parts via welding. This simplifies the construction process, shortens the installation cycle, and reduces costs to some extent. However, this solution still relies primarily on metal materials; the square steel tubes and aluminum plates result in a high overall density, failing to fully address the need for lightweighting. The limitations of metal materials in terms of thermal conductivity and corrosion resistance remain, and the welding connection method may cause thermal damage to the composite material interface, affecting long-term service performance. Furthermore, existing composite fiber materials such as carbon fiber and glass fiber are primarily used for structural reinforcement in buildings, and a systematic solution for curtain wall keels has not yet been developed, particularly in areas such as optimizing the mechanical properties of fiber-core composite structures, ensuring reliable node connections, and implementing modular assembly processes.

[0004] Based on this, this utility model provides a lightweight high-strength composite fiber curtain wall keel. Through an innovative composite structure of fiber-reinforced composite material and lightweight core layer, combined with a modular tenon and mortise connection system, it solves the problems of heavy weight, thermal bridging effect and corrosion of existing metal keels, while breaking through the structural integration and efficient installation difficulties of composite fiber materials in curtain wall keels, meeting the needs of high-rise buildings, large-span curtain walls and energy-saving buildings for high-performance keels. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a lightweight, high-strength composite fiber curtain wall keel.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A lightweight, high-strength composite fiber curtain wall keel includes a composite fiber keel with a rectangular hollow cross-section. The composite fiber keel has a three-layer structure from the inside out: a lightweight core layer, an interface bonding layer, and a fiber-reinforced composite material outer layer. An aluminum alloy base is tenon-jointed to one side of the composite fiber keel. The aluminum alloy base is fixedly connected to the composite fiber keel by multiple self-tapping screws. A connector is tenon-jointed to the end of the aluminum alloy base away from the composite fiber keel. A decorative strip base is tenon-jointed to the end of the connector. An aluminum alloy decorative strip cover plate is detachably installed at the end of the decorative strip base.

[0008] Through the above technical solutions: the outer fiber material has a tensile strength ≥800MPa, providing excellent tensile and wind load resistance; the core lightweight material has a density ≤0.5g / cm³. 3 The weight is reduced by 50%-70% compared to traditional metal keels, significantly reducing building load and transportation costs; the rectangular hollow section increases the moment of inertia and bending stiffness, meeting the wind and earthquake resistance requirements of high-rise buildings and large-span curtain walls; the connection method combining mortise and tenon structure and self-tapping screws enables rapid positioning and reliable fixing of the keel to aluminum alloy base, connectors, and decorative strip bases, reducing on-site processing steps, increasing installation efficiency by more than 50%, and reducing labor costs; the removable aluminum alloy decorative strip cover plate covers the nodes, protecting the connecting parts from corrosion and improving the overall aesthetics of the curtain wall.

[0009] Preferably, the trim base and the connector are fixedly connected by hexagonal bolts.

[0010] Through the above technical solutions: bolted connections provide reliable shear and tensile bearing capacity, ensuring the stability of nodes under long-term load and vibration environments, and avoiding the risk of slippage when mortise and tenon structures are used alone; the bolt spacing can be adjusted according to load requirements to adapt to different curtain wall design conditions, while facilitating later maintenance and component replacement.

[0011] Preferably, galvanized angle steel is also fixed to the lower side wall of the composite fiber keel.

[0012] Through the above technical solutions, galvanized angle steel is used as an auxiliary support component. Through mechanical anchoring and adhesive bonding, the load of the curtain wall is effectively transferred to the main building, improving the overall wind and earthquake resistance of the system. It is especially suitable for high-rise buildings with strong loads. The galvanizing treatment enhances the corrosion resistance of the angle steel and works synergistically with the weather resistance of the composite fiber keel to extend the service life of the curtain wall system.

[0013] Furthermore, tempered glass is installed in the gap between the aluminum alloy base and the trim base.

[0014] Through the above technical solutions: tempered glass is embedded in the gaps to form a complete enclosure structure, which has both load-bearing and transparent decorative functions, meeting the building's lighting and aesthetic needs; the glass edge sealing design prevents rainwater and dust from seeping in, and combined with the low thermal conductivity of aluminum alloy components, it reduces the thermal bridging effect and improves energy-saving performance.

[0015] Furthermore, the outer layer of the fiber-reinforced composite material is made of at least one of carbon fiber, basalt fiber, glass fiber, or aramid fiber.

[0016] Through the above technical solutions: carbon fiber is high-strength and low-expansion, making it suitable for high-precision curtain walls; glass fiber is low-cost and has good weather resistance, making it suitable for conventional buildings; basalt fiber is high-temperature resistant and corrosion-resistant, making it suitable for harsh environments and meeting different engineering needs; the recyclability of fiber materials is >90%, and the energy consumption of the production process is lower than that of metal materials, which meets green building standards.

[0017] Preferably, the lightweight core layer is made of either polyurethane foam or honeycomb aluminum.

[0018] The above technical solutions achieve the following: polyurethane foam has low density and good thermal insulation, reducing overall weight and improving thermal insulation performance; honeycomb aluminum has strong moisture resistance and high rigidity, making it suitable for high humidity or large-span scenarios. Both meet the requirement of density ≤0.5g / cm³. 3 The design meets the requirements for lightweight construction while increasing the moment of inertia of the cross section through a hollow structure. The core material can be flexibly selected according to the usage environment, such as coastal areas or cold regions, to balance lightweight, durability and functionality.

[0019] Preferably, the interfacial adhesive layer is a nano-SiO2 modified epoxy resin adhesive layer.

[0020] Through the above technical solutions: nanoparticles enhance interfacial adhesion, prevent the outer fiber from peeling off from the core layer, improve the integrity and fatigue resistance of the composite structure, and ensure long-term service stability; modified epoxy resin has better UV resistance and temperature change resistance than ordinary adhesives, and combined with the corrosion resistance of the outer fiber, the expected service life of the keel is ≥50 years, achieving the goal of maintenance-free operation.

[0021] The beneficial effects of this utility model are as follows:

[0022] 1. This utility model, through a composite structure design of a fiber-reinforced composite outer layer and a lightweight core layer, reduces the weight of traditional keel by 50%-70%, significantly reducing transportation and installation costs and building load. Simultaneously, its thermal expansion coefficient matches that of glass curtain walls, reducing temperature stress. The use of a nano-modified adhesive layer and a modular tenon-and-mortise connection system achieves a maintenance-free service life of ≥50 years and rapid assembly, with reliable node connections and an installation efficiency increase of over 50%. The material has a recyclability rate of >90%, meeting green building standards. It combines the advantages of lightweight, high strength, corrosion resistance, low energy consumption, and easy installation, making it suitable for high-rise buildings, large-span curtain walls, and energy-saving buildings.

[0023] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of a lightweight, high-strength composite fiber curtain wall keel proposed in this utility model.

[0025] Figure 2 A schematic diagram of the cross-sectional structure of a lightweight high-strength composite fiber curtain wall keel system proposed in this utility model;

[0026] Figure 3 A schematic diagram of the cross-sectional structure of a lightweight high-strength composite fiber curtain wall keel system proposed in this utility model;

[0027] Figure 4 This is a cross-sectional layered structure diagram of a lightweight, high-strength composite fiber curtain wall keel proposed in this utility model.

[0028] In the diagram: 1. Composite fiber keel; 101. Fiber-reinforced composite material outer layer; 102. Interface bonding layer; 103. Lightweight core layer; 2. Aluminum alloy base; 3. Self-tapping screw; 4. Connector; 5. Decorative strip base; 6. Hex bolt; 7. Aluminum alloy decorative strip cover plate; 8. Tempered glass; 9. Galvanized angle steel. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0030] Example 1

[0031] Reference Figures 1 to 4A lightweight, high-strength composite fiber curtain wall keel includes components such as composite fiber keel 1, aluminum alloy base 2, connector 4, decorative strip base 5, and aluminum alloy decorative strip cover plate 7. Each component is modularly assembled by mortise and tenon structure and bolt connection.

[0032] I. Structural Design of Composite Fiber Keel 1

[0033] Layered structure

[0034] Fiber-reinforced composite outer layer 101: It adopts a mixed woven layer of carbon fiber and glass fiber with a tensile strength ≥800MPa. The outer layer structure with a rectangular hollow cross section is formed by molding process, providing excellent tensile strength and wind load resistance.

[0035] Interface bonding layer 102: A nano-SiO2 modified epoxy resin bonding layer with a thickness of 0.3-0.5mm is uniformly coated on the inner side of the outer layer to ensure high-strength bonding with the core layer and avoid interlayer delamination.

[0036] Lightweight core layer 103: internally filled with polyurethane foam, density ≤0.5g / cm³ 3 The hollow cavity structure is formed by casting using a mold, which reduces its weight while increasing the moment of inertia of the cross section I ≥ 250cm. 4 Meeting the bending stiffness requirement of ≥3×10 4 N・m 2 .

[0037] Cross section and auxiliary structure

[0038] The cross-section is a rectangular hollow structure with a height of 150mm, a width of 80mm, and a wall thickness of 5mm. The hollow cavity accounts for 60% of the total volume, achieving a balance between lightweight and mechanical performance.

[0039] The lower sidewall of the composite fiber keel 1 is fixed with galvanized angle steel 9 by a combination of epoxy resin adhesive and mechanical anchoring, which is used to enhance the connection strength between the keel and the main structure and adapt to the wind load requirements of high-rise buildings.

[0040] II. Assembly of Modular Connection System

[0041] Connection between keel and aluminum alloy base 2

[0042] The composite fiber keel 1 has a pre-set tenon and mortise groove on one side, and the aluminum alloy base 2 has a corresponding tenon and mortise groove. The initial positioning is achieved through the cooperation of the groove and the groove.

[0043] Three 4mm diameter self-tapping screws 3 are used to penetrate the outer layer 101 of the keel from the outside of the aluminum alloy base 2, with a screw spacing of 100mm, to ensure connection reliability and avoid the risk of slippage of pure mortise and tenon structure.

[0044] Connection between connector 4 and trim base 5

[0045] The aluminum alloy base 2 has a tenon and mortise protrusion at the end away from the keel, and the connector 4 has a tenon and mortise groove in the middle, which forms a T-shaped connection node after being snapped together.

[0046] The decorative base 5 and the connector 4 are fixed by M6 hex bolts 6 with a bolt spacing of 150mm. The bolt holes are pre-embedded in the metal prefabricated part of the connector 4 to ensure the shear strength at the joint.

[0047] Installation of tempered glass 8

[0048] An 8mm gap is formed between the aluminum alloy base 2 and the decorative strip base 5 for installing 8mm thick tempered glass 8. The glass edge is embedded in a pre-set rubber sealing groove, which not only realizes the transparent decorative function of the curtain wall, but also forms a rigid support through the mortise and tenon structure and bolt connection, thereby improving the overall impact resistance.

[0049] Decorative strips and seals

[0050] The base of the decorative strip 5 has a slot at its end, and the aluminum alloy decorative strip cover plate 7 can be detached and installed through a snap-on structure to cover the bolt connection parts, which has both aesthetic and protective functions and prevents rainwater from seeping into the joint gaps.

[0051] III. Working Principle and Technical Effects

[0052] Mechanical performance realization

[0053] The outer layer 101 of the fiber-reinforced composite material bears the main tensile and compressive loads, while the lightweight core layer 103 increases the moment of inertia of the cross section through the hollow structure, reducing the amount of material used while meeting the requirements for bending stiffness. Compared with the traditional aluminum alloy keel, the weight is reduced by 60%, and the transportation and installation costs are reduced by 40%.

[0054] Galvanized angle steel 9 serves as an auxiliary support, transferring the curtain wall load to the main structure and enhancing the overall stability of the system. It is suitable for large-span curtain wall scenarios.

[0055] Connection and assembly advantages

[0056] The mortise and tenon structure enables rapid positioning and reduces on-site measurement errors. The connection method combining self-tapping screws and hex bolts balances assembly efficiency and connection strength, and the installation time of a single node is reduced by 50% compared to traditional bolt connections.

[0057] Modular design allows components to be prefabricated in the factory and only requires simple assembly on site, avoiding welding or complex processing, and meeting the requirements of green building industrialized production.

[0058] Durability and Functionality

[0059] The nano-SiO2 modified epoxy resin adhesive layer 102 enhances interlayer adhesion and weather resistance, and combined with the corrosion resistance of the outer fiber material, it has an expected service life of ≥50 years and requires no additional maintenance.

[0060] The tempered glass 8 and the aluminum alloy decorative strip cover plate 7 form a sealing system, effectively blocking rainwater and dust. At the same time, the aluminum alloy base 2 has a low thermal conductivity, which is 30% lower than that of pure aluminum, reducing the thermal bridge effect and meeting the energy-saving building standards.

[0061] Example 2, optional cross-section and core material

[0062] Cross-section optimization: When applied to large-span curtain walls, the cross-section of the composite fiber keel can be designed as an I-shaped or multi-cavity structure, such as a grid shape. By increasing the flange width or the number of cavities, the moment of inertia of the cross-section can be further increased to I≥350cm. 4 To meet higher bending resistance requirements.

[0063] Core material replacement: Honeycomb aluminum is used to replace polyurethane foam, which is suitable for coastal high humidity areas, improves the moisture resistance of the core layer, and maintains its lightweight characteristics.

[0064] Example 3. Node Connection Enhancement

[0065] For areas with seismic fortification intensity ≥ 8 degrees, a stainless steel sleeve is added at the connection between the aluminum alloy base 2 and the composite fiber keel 1 on the basis of the mortise and tenon connection. The sleeve is pre-embedded in the core layer of the keel, and a 6mm diameter stainless steel bolt is inserted into the sleeve to form a double mechanical connection with the self-tapping screw, thereby improving the seismic performance of the node.

[0066] The above embodiments, through composite material structure, modular connection design and detailed optimization, realize a lightweight, high-strength and easy-to-install curtain wall keel system, which is suitable for high-rise buildings, large-span curtain walls and energy-saving building scenarios, and has the advantages of mechanical performance, durability and green environmental protection.

[0067] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A lightweight, high-strength composite fiber curtain wall keel, comprising a composite fiber keel (1), characterized in that, The composite fiber keel (1) has a rectangular hollow cross section and is divided into three layers from the inside out: a lightweight core layer (103), an interface bonding layer (102), and a fiber-reinforced composite material outer layer (101). An aluminum alloy base (2) is tenon-jointed on one side of the composite fiber keel (1). The aluminum alloy base (2) is fixedly connected to the composite fiber keel (1) by multiple self-tapping screws (3). A connector (4) is tenon-jointed at the end of the aluminum alloy base (2) away from the composite fiber keel (1). A decorative strip base (5) is tenon-jointed at the end of the connector (4). An aluminum alloy decorative strip cover plate (7) is detachably installed at the end of the decorative strip base (5).

2. The lightweight high-strength composite fiber curtain wall keel according to claim 1, characterized in that, The decorative strip base (5) and the connector (4) are fixedly connected by hexagonal bolts (6).

3. The lightweight high-strength composite fiber curtain wall keel according to claim 1, characterized in that, The lower side wall of the composite fiber keel (1) is also fixed with galvanized angle steel (9).

4. The lightweight high-strength composite fiber curtain wall keel according to claim 1, characterized in that, Tempered glass (8) is provided in the gap between the aluminum alloy base (2) and the decorative strip base (5).

5. The lightweight high-strength composite fiber curtain wall keel according to claim 1, characterized in that, The lightweight core layer (103) is made of either polyurethane foam or honeycomb aluminum.

6. The lightweight high-strength composite fiber curtain wall keel according to claim 1, characterized in that, The interface bonding layer (102) is a nano-SiO2 modified epoxy resin bonding layer.

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