Prefabricated aluminum alloy tube-concrete-steel tube composite member

Abstract

The utility model provides a kind of assembled aluminum alloy pipe-concrete-steel pipe composite component, the composite component includes outer pipe body and built-in steel pipe, the built-in steel pipe is coaxially arranged in the inside of the outer pipe body, cavity is formed between the outer pipe body and built-in steel pipe, and the cavity is filled with concrete;The outer pipe body is aluminum alloy cold-rolled sheet material roll bending forming structure, and is formed closed pipe body by at least three partial limbs enclosing;Each partial limb includes partial limb body and stiffened plate located at the both ends of partial limb body, and the partial limb body and the stiffened plate at both ends are synchronously roll bending forming integrated structure;Partial limb enclosing forms circular, rectangular or regular polygonal cross section, and adjacent partial limb is fixed by the stiffened plate at both ends, and adjacent stiffened plate is connected by cementing-mechanical composite connection.The outer pipe body of the utility model is aluminum alloy cold-rolled sheet material roll bending forming structure, and the connection between outer pipe partial limb is connected by cementing-mechanical composite connection, does not need welding, and welding can be avoided to cause the problem such as strength reduction.

Description

Technical Field

[0001] This utility model relates to the field of engineering structure technology, and in particular to prefabricated aluminum alloy pipe-concrete-steel pipe composite components. Background Technology

[0002] With the continuous development of the economy and society, hollow sandwich structures have promising application prospects in the field of civil engineering due to their lightweight and efficient load-bearing characteristics. Their overall bending stiffness is significantly improved, effectively resisting deformation under bending loads, providing a superior structural solution for engineering scenarios with high requirements for bending performance, such as long-span bridges and tall structures.

[0003] Hollow-core steel-concrete composite structures are widely used in high-rise buildings, transmission towers, and arch structures due to their high load-bearing capacity, high bending stiffness, good toughness, and convenient construction. However, the poor corrosion resistance of steel leads to high maintenance costs and potential safety hazards. Aluminum alloy tube concrete components, through the synergistic effect of the aluminum alloy tube and the core concrete, leverage the excellent corrosion resistance and restraining effect of the aluminum alloy tube, while the supporting effect of the core concrete delays the local buckling of the aluminum alloy tube, achieving a dual optimization of mechanical properties and durability. However, the initial cost of aluminum alloy is higher than that of ordinary carbon steel, resulting in a higher initial cost for aluminum alloy tube concrete than that of ordinary steel tube concrete, thus limiting its widespread application in practical engineering. Therefore, reducing the amount of aluminum alloy used without compromising performance is one of the challenges in promoting the application of this type of structure.

[0004] Aluminum alloys, as lightweight and high-strength metallic materials, possess excellent corrosion resistance, good plasticity, and processing performance. Their density is lower than steel, effectively reducing structural weight under the same stress conditions. Furthermore, a dense oxide film easily forms on their surface, significantly resisting erosion from the atmosphere, water, and various corrosive media, maintaining structural stability long-term without complex post-construction anti-corrosion treatment. While aluminum alloys possess excellent properties, they also have certain drawbacks. For example, compared to traditional structural materials like carbon steel, their elastic modulus is lower, making them prone to larger deformations under the same load, affecting the overall structural stability. Additionally, welding aluminum alloys, due to their high thermal conductivity and large coefficient of linear expansion, easily generates significant welding stress and deformation, resulting in a significant decrease in the mechanical properties of the heat-affected zone, with a marked reduction in strength and plasticity. Moreover, the complex internal welding process and difficulty in quality control further reduce the structure's load-bearing capacity and ductility. In addition, most of the aluminum alloy tubes used in current projects are extruded tubes. Due to limitations in extrusion equipment, cross-sectional dimensions, and extrusion ratio, the size range of their components is greatly restricted, making it difficult to meet the diverse engineering needs of aluminum alloy materials in various application scenarios. Utility Model Content

[0005] In view of the technical problems in the prior art, such as the low elastic modulus of aluminum alloy materials, the easy occurrence of local buckling of aluminum alloy tubes, which affects the overall load-bearing capacity of the structure; the high thermal conductivity and large coefficient of linear expansion of aluminum alloy materials, which easily generate large welding stress and deformation when using welding process, and the significant attenuation of mechanical properties in the heat-affected zone, with a significant decrease in strength and plasticity; and the complexity of the internal welding process and the difficulty in controlling the quality, this utility model provides a prefabricated aluminum alloy tube-concrete-steel tube composite component.

[0006] To achieve the above objectives, this utility model provides a prefabricated aluminum alloy pipe-concrete-steel pipe composite component, including an outer pipe body and an inner steel pipe. The inner steel pipe is coaxially disposed inside the outer pipe body, and a cavity is formed between the outer pipe body and the inner steel pipe. The cavity is filled with concrete. The outer tube is a roll-formed structure of cold-rolled aluminum alloy sheet, and is formed by at least three segments enclosing a closed tube. Each segment includes a segment body and stiffening plates at both ends of the segment body. The segment body and the stiffening plates at both ends are an integral structure formed by synchronous roll bending. After the segments are enclosed, they form a circular, rectangular or regular polygonal cross section, and adjacent segments are fixed by the stiffening plates at both ends. The adjacent stiffening plates are connected by an adhesive-mechanical composite connection.

[0007] Furthermore, the openings of the limbs face the center of the tube body.

[0008] Furthermore, the cross-sectional shape of the built-in steel pipe is circular, rectangular, or regular polygonal; the shapes of the outer tube and the built-in steel pipe can be freely combined.

[0009] Furthermore, when the limbs are enclosed to form a circular cross-section, the cross-sectional shape of the limb body is arc-shaped; when the limbs are enclosed to form a rectangular cross-section, the cross-sectional shape of the limb body is L-shaped.

[0010] Furthermore, the mechanical connection is a riveting or bolting connection; the adhesive used for bonding is structural adhesive, and the riveting uses rivets.

[0011] Furthermore, the rivets are solid or hollow and are spaced apart along the length of the limb connection seam; the structural adhesive fills the gaps in the limb connection seam and wraps the shank portion of the rivet or the threaded portion of the bolt.

[0012] Furthermore, the rivets and bolts are arranged in a staggered or parallel manner along the length of the limb connection seam.

[0013] Furthermore, the outer tube is made of 5-series, 6-series, or 7-series aluminum alloy.

[0014] Furthermore, the built-in steel pipe is a structural steel pipe or a stainless steel pipe.

[0015] Furthermore, the concrete is ordinary concrete or lightweight concrete, and the strength of the concrete matches the strength of the aluminum alloy material of the outer tube.

[0016] This utility model has the following beneficial effects: 1. This utility model provides an assembled aluminum alloy tube-concrete-steel tube composite component, including an outer tube body and an inner steel tube. The inner steel tube is coaxially disposed inside the outer tube body, forming a cavity between the outer tube body and the inner steel tube, which is filled with concrete. The outer tube body is a roll-formed structure of cold-rolled aluminum alloy sheet, and is formed by at least three segments enclosing a closed tube body. Each segment includes a segment body and stiffening plates at both ends of the segment body. The segment body and the stiffening plates at both ends are synchronously roll-formed into an integral structure. After multiple segments are enclosed, a circular, rectangular, or regular polygonal cross section is formed, and adjacent segments are fixed by the stiffening plates at both ends. Adjacent stiffening plates are connected by an adhesive-mechanical composite connection. The aluminum alloy outer tube body in this utility model adopts a cold-rolled sheet roll-formed and assembled process. The connection between the various segments of the outer tube body is a composite connection by adhesive-mechanical bonding, eliminating the need for welding and avoiding the problem of strength reduction caused by welding of aluminum alloy. Meanwhile, the aluminum alloy outer tube is composed of multiple segments, which can meet the needs of non-standard or large-size cross-section components. Furthermore, in this invention, the aluminum alloy outer tube and concrete work together and complement each other. Under external loads, the aluminum alloy outer tube gradually constrains the core concrete, placing it in a complex stress state, thereby improving its compressive strength and ductility. This invention features a sandwich structure composed of an inner steel tube and an outer hollow aluminum alloy tube concrete. The inner steel tube provides support for the sandwich concrete, and the interface between the aluminum alloy outer tube, concrete, and inner steel tube exhibits good performance. Moreover, the inner and outer tubes can provide formwork for the sandwich concrete, making concrete pouring more convenient.

[0017] 2. This utility model provides a prefabricated aluminum alloy pipe-concrete-steel pipe composite component. The various parts of the outer pipe are connected by a composite adhesive-mechanical connection, solving the defects of a single connection method. It avoids the problems of slow curing and easy failure under high loads of simple adhesive bonding, and also makes up for the shortcomings of simple mechanical connection, such as stress concentration, poor sealing, and susceptibility to corrosion. The strength and stiffness of the component are improved, stress concentration is significantly alleviated, durability is enhanced, and installation efficiency is higher. This utility model first uses structural adhesive to fix and position the pipes initially, accurately aligning the aluminum alloy pipe parts (such as bolt holes), avoiding component displacement during subsequent mechanical connection, and reducing installation difficulty. After curing, it provides basic fastening force, providing a stable benchmark for mechanical connection operations. Adhesive bonding makes the stress distribution continuous and uniform, significantly reducing stress concentration and improving fatigue performance; at the same time, it provides good sealing, facilitating concrete pouring and corrosion protection at the connection; and it maintains a smooth and aesthetically pleasing surface. Compared with a fully mechanical connection, adhesive bonding does not require additional metal connectors, which can reduce the overall weight of the connection system (such as the number of bolts), meeting the application requirements of lightweight aluminum alloy pipe components. Through reasonable design and construction, this utility model can ensure the load-bearing capacity of assembled aluminum alloy tubes, that is, the failure of the joint of the limbs will not occur before the overall failure of the combined components; at the same time, it can also make up for the problem of no support during the curing period of adhesive joints.

[0018] 3. This utility model provides a prefabricated aluminum alloy tube-concrete-steel tube composite component, wherein each segment includes a segment body and stiffening plates located at both ends of the segment body. The segment body and the stiffening plates at both ends are integrally formed by synchronous roll bending. The stiffening plates located at both ends of the segment body can play the following roles: first, they can delay the local buckling of the aluminum alloy tube, thereby improving the load-bearing capacity of the component; second, they also serve as connecting plates for a composite connection method of adhesive-mechanical connection; and third, they increase the contact surface with concrete, thereby further improving the bonding performance between the two.

[0019] 4. This utility model provides a prefabricated aluminum alloy tube-concrete-steel tube composite component. Filling the cavity of the aluminum alloy tube with concrete improves the component's load-bearing capacity, ductility, and fire resistance. Simultaneously, using steel for the inner tube significantly enhances the overall stiffness and load-bearing capacity of the composite structure, delaying or suppressing local instability and strengthening its deformation resistance. Furthermore, it reduces the amount of aluminum alloy material used under the same conditions, lowering economic costs. The cavity of the tube can be filled with ordinary concrete or lightweight concrete, greatly reducing the self-weight of the aluminum alloy concrete column. The concrete in the interlayer also provides insulation, fireproofing, and corrosion protection for the inner tube, leveraging the lightweight and corrosion-resistant advantages of the aluminum alloy tube. In addition, the outer tube's components are all made of 5-series, 6-series, or 7-series aluminum alloy, avoiding electrochemical corrosion caused by mixing different metal materials. Aluminum alloy also has good corrosion resistance, reducing the cost of later maintenance. Moreover, aluminum alloy has a special metallic luster, achieving an aesthetically pleasing appearance without additional decoration.

[0020] 5. This utility model provides a prefabricated aluminum alloy tube-concrete-steel tube composite component. The advantage of the hollow sandwich structure lies in the balance between load-bearing performance and lightweight design. The hollow section significantly reduces the structural self-weight while ensuring the overall load-bearing capacity of the component. Compared to solid steel tube concrete components, its self-weight can be reduced by 20% to 40% under the same load-bearing capacity. This characteristic makes it particularly suitable for high-rise buildings, long-span bridges, and tall structures where weight reduction requirements are stringent. It reduces the vertical load on the foundation, lowering the design difficulty and cost of foundation engineering, and also reduces the structural inertial forces under horizontal actions such as earthquakes and wind loads, improving overall disaster resistance. Secondly, the annular or box-shaped structure of the hollow section has a larger moment of inertia, possessing excellent lateral and torsional stiffness. Finally, the hollow internal channels can be directly used for laying water and electricity pipelines, ventilation ducts, or communication cables without the need for additional drilling after the component is formed, avoiding damage to the component cross-section and simplifying the construction process.

[0021] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings: Figure 1 This is an overall structural diagram of the prefabricated circular aluminum alloy tube-concrete-steel tube composite component according to Embodiment 1 of this utility model; Figure 2This is a cross-sectional schematic diagram of the assembled circular aluminum alloy tube-concrete-steel tube composite component according to Embodiment 1 of this utility model; Figure 3 This is a cross-sectional schematic diagram of a single limb of the assembled circular aluminum alloy tube-concrete-steel tube composite component according to Embodiment 1 of this utility model; Figure 4 This is a partial view of the segmented connection of the assembled circular aluminum alloy tube-concrete-steel tube composite component according to Embodiment 1 of this utility model; Figure 5 This is a cross-sectional schematic diagram of the prefabricated square aluminum alloy tube-concrete-steel tube composite component according to Embodiment 2 of this utility model; Figure 6 This is a cross-sectional schematic diagram of a single limb of the prefabricated square aluminum alloy tube-concrete-steel tube composite component according to Embodiment 2 of this utility model; The components are: 1. outer tube body, 2. inner steel tube, 3. concrete, 4. limbs, 5. limb body, 6. stiffening plate, and 7. rivets. Detailed Implementation

[0023] The embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0024] like Figure 1-6 As shown, this utility model provides a prefabricated aluminum alloy pipe-concrete-steel pipe composite component, including an outer pipe body 1 and an inner steel pipe 2. The inner steel pipe 2 is coaxially arranged inside the outer pipe body 1, and a cavity is formed between the outer pipe body 1 and the inner steel pipe 2. The cavity is filled with concrete 3.

[0025] The outer tube 1 is a roll-formed structure of cold-rolled aluminum alloy sheet, and is enclosed by at least three segments 4 to form a closed tube. Each segment 4 includes a segment body 5 and stiffening plates 6 at both ends of the segment body 5. The segment body 5 and the stiffening plates 6 at both ends are integrally formed by synchronous roll bending. The segments 4, when enclosed, form a circular, rectangular, or regular polygonal cross-section (such as a regular pentagon or regular hexagon). Adjacent segments 4 are fixed by the stiffening plates 6 at both ends, and adjacent stiffening plates 6 are connected by an adhesive-mechanical composite connection. The composite connection of each segment 4 encloses the outer tube 1 with the inner stiffening plates 6, delaying the local buckling of the aluminum alloy tube and improving the load-bearing capacity and ductility of the component. The stiffening plates 6 at both ends of the segment body 5 can play the following roles: firstly, they can delay the local buckling of the aluminum alloy tube, thereby improving the load-bearing capacity of the component; secondly, they also serve as connecting plates for the adhesive-mechanical composite connection; and thirdly, they increase the contact surface with concrete, thereby further improving the bonding performance between the two.

[0026] The cross-sectional shape of the built-in steel pipe 2 is circular, rectangular, or a regular polygon. The shapes of the outer pipe body 1 and the built-in steel pipe 2 can be freely combined. When the segments 4 are enclosed to form a circular cross-section, the cross-sectional shape of the segment body 5 is arc-shaped; when the segments 4 are enclosed to form a rectangular cross-section, the cross-sectional shape of the segment body 5 is L-shaped; and the opening of the segment 4 faces the center of the pipe body.

[0027] The mechanical connection is a riveting or bolting connection; the adhesive used for bonding is structural adhesive, and the riveting uses rivets 7. Preferably, the rivets 7 are solid or hollow rivets, and are spaced apart along the length of the joint. The structural adhesive fills the gaps in the joint and covers the shank portion of the rivet or the threaded portion of the bolt. The rivets and bolts are arranged in a staggered or parallel pattern along the length of the joint.

[0028] This invention employs a composite connection process of first gluing and then mechanically connecting. The connection using structural adhesives ensures continuous and uniform stress distribution in the pipe, significantly reduces stress concentration, improves fatigue performance, provides good sealing and sound insulation and vibration reduction effects, and maintains a smooth and aesthetically pleasing surface.

[0029] The outer tube is made of 5-series, 6-series, or 7-series aluminum alloy. 6-series aluminum alloy is preferred, with a density of 2.7 g / cm³. 3 The stiffening plates on the outer tube are all made of 5-series, 6-series, or 7-series aluminum alloy, which avoids electrochemical corrosion caused by mixing different metal materials. At the same time, aluminum alloy has good corrosion resistance, which can reduce the cost of later maintenance of components. In addition, aluminum alloy has a special metallic luster, which can achieve an aesthetically pleasing effect without additional decoration.

[0030] The built-in steel pipe is a structural steel pipe or a stainless steel pipe. The concrete is ordinary concrete or lightweight concrete, and the strength of the concrete matches the strength of the aluminum alloy material of the outer pipe. The core advantage of ordinary concrete lies in the wide availability and accessibility of its materials. Major raw materials such as cement and sand are readily available in various regions, requiring no complex special processing. This not only reduces material transportation costs but also ensures the stability of raw material supply for large-scale construction. The advantage of lightweight concrete is a significant reduction in structural self-weight. Its apparent density is typically only 1 / 3 to 2 / 3 of that of ordinary concrete. Using it in high-rise buildings, large-span structures, or prefabricated buildings can significantly reduce the overall weight of the building, thereby reducing the bearing load on the foundation and lowering the design difficulty and cost of foundation engineering. Simultaneously, it can reduce the cross-sectional dimensions of load-bearing components such as beams and columns, saving structural materials and increasing usable interior space.

[0031] This utility model provides a prefabricated aluminum alloy tube-concrete-steel tube composite component. Filling the cavity of the aluminum alloy tube with concrete enhances the component's load-bearing capacity, ductility, and fire resistance. Simultaneously, using steel for the inner tube significantly improves the overall stiffness and load-bearing capacity of the composite structure, delaying or suppressing local instability and strengthening its deformation resistance. Furthermore, it reduces the amount of aluminum alloy material used under the same conditions, lowering economic costs. The cavity of the tube can be filled with ordinary concrete or lightweight concrete, greatly reducing the self-weight of the aluminum alloy concrete column. The concrete in the interlayer also provides insulation, fireproofing, and corrosion protection for the inner tube, leveraging the lightweight and corrosion-resistant advantages of the aluminum alloy tube.

[0032] The aluminum alloy outer tube of this invention is formed by cold-rolled sheet metal roll bending and assembly. The connections between the various parts of the outer tube are achieved through a composite adhesive-mechanical connection, eliminating the need for welding and avoiding the strength reduction issues caused by welding in aluminum alloys. Furthermore, the aluminum alloy outer tube is composed of four parts, which can meet the needs of non-standard or large-size cross-section components. In addition, the aluminum alloy outer tube and concrete work together and complement each other in this invention. Under external loads, the aluminum alloy outer tube gradually constrains the core concrete, placing it in a complex stress state, thereby improving its compressive strength and ductility. This invention features a sandwich structure composed of an inner steel tube and an outer hollow aluminum alloy tube concrete. The inner steel tube provides support for the sandwich concrete, and the interface between the aluminum alloy outer tube, concrete, and inner steel tube exhibits good working performance. Moreover, the inner and outer tubes can provide formwork for the sandwich concrete, making concrete pouring more convenient.

[0033] The manufacturing process of the above-mentioned prefabricated aluminum alloy tube-concrete-steel tube composite component is as follows: Step 1: Select 5-series, 6-series, or 7-series cold-rolled aluminum alloy sheets that meet the strength requirements, and cut them into sheets according to the design dimensions.

[0034] Step 2: Feed the sheet metal into the three-roll bending mill. For the segment with longitudinal stiffening plate, a multi-pass progressive rolling die is customized. Through 3 to 4 passes of progressive rolling forming process, while ensuring that the bending radius is ≥2 times the wall thickness to avoid cracking, a one-piece segment with stiffening plate is finally obtained.

[0035] Step 3: Place the aluminum alloy tube segments in an environment of 120~150℃ for 2~4 hours to accelerate the release of elastic stress through artificial aging, and then let them stand at room temperature for 24~48 hours to further stabilize the dimensions. Use a straightening machine to finish and straighten the aluminum alloy tube segments, controlling the straightening deformation to ≤ 0.5% of the cross-sectional dimensions, with the final cross-sectional angle deviation ≤ ±0.5° and side length tolerance ±0.5mm.

[0036] Step 4: Perform low-temperature aging treatment on the aluminum alloy tube segments, heating to 150~180℃ and holding for 6~8 hours to improve the yield strength of the segments.

[0037] Step 5: Spray a chromium conversion coating (or a chromium-free passivator) onto the surface of the aluminum alloy tube segments to form a protective film with a thickness of 0.5~1μm, which improves corrosion resistance and provides interface protection for subsequent assembly, bonding, and riveting.

[0038] Step 6: Perform dimensional and performance testing on the aluminum alloy tube segments, and connect the qualified segments using an adhesive bonding process. The first two steps of the adhesive bonding process are pre-assembly and surface preparation. The numerous segments involved in the bonding are assembled according to the product drawings and technical specifications, and the bonding quality is checked. The surfaces of the aluminum alloy tube segments undergo phosphoric acid anodizing treatment (phosphoric acid concentration 120-140g / L, voltage 10±1V, temperature 25±5℃, time 20±1min), combined with an anti-corrosion primer, to form a porous oxide film. A two-component epoxy adhesive (such as J-36 adhesive) is used as the bonding material, with the adhesive layer thickness controlled at 0.1-0.3mm. The edge extends 5-8mm beyond the riveting area to form an overflow seal. The segments are aligned and pre-fixed using clamps. Rivets are made of aluminum alloys with good plasticity, such as 5056 aluminum alloy countersunk rivets. The outer tube is then formed into a circular (or square) closed tube using a riveting process. Symmetrical staggered riveting can be used, with rivet spacing ≥ 2.5 times the rivet hole diameter and ≤ 14 times the plate thickness and ≤ 200mm. Double-row riveting can also be used, with rivet spacing ≥ 2.5 times the rivet hole diameter and edge distance twice the diameter. Alternatively, bolts can be used instead of rivets.

[0039] Step 7: Use a positioning device to hoist the inner steel pipe into the outer aluminum alloy pipe, ensuring that the coaxiality deviation does not exceed 5mm.

[0040] Step 8: Pump concrete into the annular cavity of the outer pipe and the inner steel pipe, and perform subsequent curing treatment.

[0041] Example 1 This embodiment provides a prefabricated circular aluminum alloy tube-concrete-steel tube composite component, including an outer tube body 1 and an inner steel tube 2. The inner steel tube 2 is coaxially disposed inside the outer tube body 1, and a cavity is formed between the outer tube body 1 and the inner steel tube 2. The cavity is filled with concrete 3 (such as...). Figure 1-2 (As shown).

[0042] The outer tube 1 is a roll-formed structure of cold-rolled aluminum alloy sheet, and is enclosed by four segments 4 to form a closed tube; each segment 4 includes a segment body 5 and stiffening plates 6 located at both ends of the segment body 5 (e.g., Figure 3As shown, the limb body 5 and the stiffening plates 6 at both ends are synchronously roll-formed into an integral structure; the four limbs 4 form a circular cross-section after being enclosed, and the cross-sectional shape of the limb body 5 is arc-shaped; and the opening of the limbs faces the center of the tube body. Adjacent limbs 4 are fixed by the stiffening plates 6 at both ends, and adjacent stiffening plates 6 are connected by an adhesive-mechanical composite connection. The mechanical connection is riveting; the adhesive uses structural adhesive, and the riveting uses rivets 7. Preferably, the rivets 7 are solid rivets or hollow rivets, and are spaced apart along the length of the limb connection seam. The structural adhesive fills the gaps in the limb connection seam and wraps the rivet shank. The rivets are staggered along the length of the limb connection seam. The outer tube body is made of 5-series, 6-series, or 7-series aluminum alloy. Among them, 6-series aluminum alloy is preferred, and the density of the aluminum alloy is 2.7 g / cm³. 3 .

[0043] The built-in steel pipe is a circular steel pipe. The concrete is ordinary concrete, and the strength of the concrete matches the strength of the aluminum alloy material of the outer pipe.

[0044] Example 2 This embodiment provides a prefabricated square aluminum alloy tube-concrete-steel tube composite component, including an outer tube body 1 and an inner steel tube 2. The inner steel tube 2 is coaxially disposed inside the outer tube body 1, and a cavity is formed between the outer tube body 1 and the inner steel tube 2. The cavity is filled with concrete 3 (such as...). Figure 5 (As shown).

[0045] The outer tube 1 is a roll-formed structure of cold-rolled aluminum alloy sheet, and is enclosed by four segments 4 to form a closed tube; each segment 4 includes a segment body 5 and stiffening plates 6 located at both ends of the segment body 5 (e.g., Figure 6 As shown, the limb body 5 and the stiffening plates 6 at both ends are synchronously roll-formed into an integral structure; the four limbs 4 form a rectangular cross-section after being enclosed, and the cross-sectional shape of the limb body 5 is L-shaped; and the opening of the limbs faces the center of the tube body. Adjacent limbs 4 are fixed by the stiffening plates 6 at both ends, and adjacent stiffening plates 6 are connected by an adhesive-mechanical composite connection. The mechanical connection is a bolt connection; the adhesive uses structural adhesive. The structural adhesive fills the gap in the limb connection seam and wraps the shank of the rivet or the threaded part of the bolt. The rivets and bolts are arranged side by side along the length of the limb connection seam. The outer tube body is made of 5-series, 6-series, or 7-series aluminum alloy. Among them, 6-series aluminum alloy is preferred, and the density of aluminum alloy is 2.7 g / cm³. 3 The built-in steel pipe is a square stainless steel pipe. The concrete is lightweight concrete, and the strength of the concrete matches the strength of the aluminum alloy material of the outer pipe body.

[0046] This utility model provides a prefabricated aluminum alloy tube-concrete-steel tube composite component. The aluminum alloy outer tube body is formed by cold-rolled sheet metal roll bending and assembly process. The connection between the outer tube segments is through a composite adhesive-mechanical connection, eliminating the need for welding and avoiding the strength reduction problems caused by welding of aluminum alloy. At the same time, the aluminum alloy outer tube body is formed by segment enclosure, which can meet the needs of non-standard cross-section or large-size cross-section components.

[0047] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A prefabricated aluminum alloy pipe-concrete-steel pipe composite component, characterized in that, It includes an outer tube and an inner steel pipe, wherein the inner steel pipe is coaxially disposed inside the outer tube, and a cavity is formed between the outer tube and the inner steel pipe, and the cavity is filled with concrete; The outer tube is a roll-formed structure of cold-rolled aluminum alloy sheet, and is formed by at least three segments enclosing a closed tube. Each segment includes a segment body and stiffening plates at both ends of the segment body. The segment body and the stiffening plates at both ends are an integral structure formed by synchronous roll bending. After the segments are enclosed, they form a circular, rectangular or regular polygonal cross section, and adjacent segments are fixed by the stiffening plates at both ends. The adjacent stiffening plates are connected by an adhesive-mechanical composite connection.

2. The prefabricated aluminum alloy pipe-concrete-steel pipe composite component according to claim 1, characterized in that, The openings of the limbs face the center of the tube.

3. The prefabricated aluminum alloy pipe-concrete-steel pipe composite component according to claim 1, characterized in that, The cross-sectional shape of the built-in steel pipe is circular, rectangular, or a regular polygon.

4. The prefabricated aluminum alloy pipe-concrete-steel pipe composite component according to claim 1, characterized in that, When the limbs are enclosed to form a circular cross-section, the cross-sectional shape of the limb body is arc-shaped; when the limbs are enclosed to form a rectangular cross-section, the cross-sectional shape of the limb body is L-shaped.

5. The prefabricated aluminum alloy pipe-concrete-steel pipe composite component according to claim 1, characterized in that, The mechanical connection is a riveting or bolting connection; the adhesive used for bonding is structural adhesive, and the riveting uses rivets.

6. The prefabricated aluminum alloy pipe-concrete-steel pipe composite component according to claim 5, characterized in that, The rivets are solid or hollow and are spaced apart along the length of the limb connection seam; the structural adhesive fills the gaps in the limb connection seam and wraps the shank portion of the rivet or the threaded portion of the bolt.

7. The prefabricated aluminum alloy pipe-concrete-steel pipe composite component according to claim 6, characterized in that, The rivets and bolts are arranged in a staggered or parallel pattern along the length of the joint.

8. The prefabricated aluminum alloy pipe-concrete-steel pipe composite component according to claim 1, characterized in that, The outer tube is made of 5-series, 6-series, or 7-series aluminum alloy.

9. The prefabricated aluminum alloy pipe-concrete-steel pipe composite component according to claim 1, characterized in that, The built-in steel pipe is a structural steel pipe or a stainless steel pipe.

10. The prefabricated aluminum alloy pipe-concrete-steel pipe composite component according to claim 1, characterized in that, The concrete is either ordinary concrete or lightweight concrete.

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