Detachable recycled aluminum alloy pipe and full-recycled self-compacting expanded concrete composite column

Abstract

The detachable recycled aluminum alloy pipe and full recycled self-compacting and expanding concrete combined column of the present application comprises a recycled aluminum alloy square pipe, arc-shaped partition plates arranged inside four right angles of the square pipe, a box-shaped arch frame arranged inside the square pipe, stiffening connecting pieces, and full recycled self-compacting and expanding concrete. Both ends of each arc-shaped partition plate are mounted on the inner walls of the two sides constituting the right angle, and together with the two side walls, enclose a detachable pipeline hiding area extending along the length direction of the pipe. The detachable pipeline hiding area is not filled with full recycled self-compacting and expanding concrete. Both ends of each stiffening connecting piece are connected with the inner wall of the square pipe and the outer wall of the box-shaped arch frame, respectively. The full recycled self-compacting and expanding concrete is filled in all the gaps enclosed between the outside of the box-shaped arch frame, the side of the arc-shaped partition plate facing the box-shaped arch frame, and the plurality of stiffening connecting pieces. The present application solves the problem of cooperative stress of the recycled aluminum alloy pipe and the full recycled self-compacting and expanding concrete combined column, increases the rigidity and bearing capacity of the combined structure, and optimizes the cross-section utilization.

Description

Technical Field

[0001] This invention belongs to the field of building structure and construction technology, specifically relating to a detachable recycled aluminum alloy pipe and a fully recycled self-compacting expansive concrete composite column. Background Technology

[0002] With increasing emphasis on sustainable development in the construction industry, recycled aluminum alloys and fully recycled concrete, as green building materials, have shown great potential in reducing carbon emissions and recycling resources. However, compared to virgin aluminum, recycled aluminum alloys have slightly lower ductility and are more prone to brittle fracture. This leads to significant stress concentration in right-angle areas of traditional square aluminum alloy tube-concrete composite columns under compression. This uneven stress distribution often causes premature bulging or even tearing of the tube wall. Furthermore, the constraint effect of the square cross-section on the internal concrete rapidly diminishes at the corners, preventing the material's synergistic load-bearing capacity from being fully utilized, thus limiting its application in high-rise and large-span structures. On the other hand, modern architecture places higher demands on the functional integration of structural components, but existing composite column designs often focus on increasing load-bearing capacity while neglecting the coordination between construction convenience and subsequent maintenance. Traditional column cross-sections lack dedicated conduit channels, requiring additional mounting plates or grooves for indoor power and communication wiring, increasing construction costs and detracting from the aesthetics of the space. Simultaneously, the connection between structural columns and infill walls often relies on post-installed tie bars, resulting in limited connection stiffness and a long construction period. Therefore, how to design a complex cross-section composite column that can optimize the mechanical constraint mechanism, suppress the bulging of recycled aluminum tubes, and integrate pipeline concealment and modular wall connection functions has become a technical problem that urgently needs to be solved in the field of composite structures. Summary of the Invention

[0003] To address the technical bottlenecks of existing technologies, such as the tendency of recycled aluminum alloy tubes to bulge and tear, uneven core stress, and low degree of integration between structure and function, this invention proposes a detachable recycled aluminum alloy tube and fully recycled self-compacting expansive concrete composite column. The aim is to improve the synergistic stress performance between materials through geometric optimization and to achieve a high degree of integration of building functions through modular construction.

[0004] To achieve the above objectives, the specific solution of the present invention is as follows:

[0005] A detachable recycled aluminum alloy pipe and fully recycled self-compacting expansive concrete composite column includes a square pipe made of recycled aluminum alloy material, arc-shaped partitions at the four corners of the square pipe, a box-shaped arch frame inside the square pipe, multiple stiffening connectors spaced between the square pipe and the box-shaped arch frame, and fully recycled self-compacting expansive concrete. The two ends of each arc-shaped partition are respectively installed on the inner walls of the two sides forming the corner, and together with the inner walls of the two sides of the corner, they enclose a detachable pipeline hiding area extending along the length of the pipe. The detachable pipeline hiding area is not filled with fully recycled self-compacting expansive concrete. The two ends of each stiffening connector are respectively connected to the inner wall of the square pipe and the outer wall of the box-shaped arch frame. The fully recycled self-compacting expansive concrete fills all the gaps formed by the outer side of the box-shaped arch frame, the side of the arc-shaped partition facing the box-shaped arch frame, and the multiple stiffening connectors.

[0006] Furthermore, the square tube is provided with an integrally formed connecting groove for fitting and connecting with the building wall.

[0007] Furthermore, the box-shaped arch frame is a double-chamber or multi-chamber rectangular structure, and its cross-sectional central axis coincides with the central axis of the square tube.

[0008] Furthermore, the stiffening connector is a thin aluminum plate, which is arranged at equal or unequal intervals along the length of the square tube.

[0009] Furthermore, the square tube includes a tube body and L-shaped right-angle members that can be detachably installed at the four corners of the tube body. One side of each L-shaped right-angle member is hinged to the tube body via a hinge, and the other side is provided with a magnetic strip A. A magnetic strip B that attracts the magnetic strip A is provided on the side of the tube body corresponding to the L-shaped right-angle member.

[0010] Furthermore, the L-shaped right-angle member has at least one opening hole, which is a round hole with a diameter of 15~30mm.

[0011] Furthermore, the fully recycled self-compacting expansive concrete is composed of water, cement, fly ash, recycled fine aggregate, recycled coarse aggregate, and water-reducing agent. The dosage of each component is as follows: water 196 kg / m³, cement 400 kg / m³, fly ash 116 kg / m³, recycled fine aggregate 827 kg / m³, recycled coarse aggregate 810 kg / m³, and the water-reducing agent is 0.5% of the total mass of cement and fly ash.

[0012] Advantages of the present invention

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) The present invention effectively solves the problem of “bending and tearing” at the corner of the square tube by means of the arc-shaped partition design. Combined with the internal box-shaped arch frame, the composite column has extremely high load-bearing capacity and bending stiffness while reducing its own weight.

[0015] (2) The present invention logically separates the structural stress area and the functional wiring area, and uses the non-core stress area (right-angle cavity) as a detachable pipeline hiding area, realizing the spatial reuse of structural stress and pipeline layout, and significantly improving the overall utilization efficiency of the cross section.

[0016] (3) The present invention uses fully recycled self-compacting expansive concrete, which utilizes its high fluidity to achieve vibration-free pouring; the integrally formed groove of the square tube can form a tongue-and-groove nested connection with the wall, which simplifies the connection process between the column and the wall and shortens the construction cycle.

[0017] (4) The present invention uses recycled aluminum alloy and fully recycled self-compacting expansive concrete throughout the process, which greatly reduces the carbon emissions of building components and has significant energy-saving and emission-reduction effects and environmental benefits.

[0018] (5) The design of the detachable L-shaped right-angle component of the present invention allows for pipeline maintenance without damaging the structure, and the detachable pipeline hidden area can be opened directly for operation, reducing the cost of later maintenance.

[0019] (6) The cross-sectional design of the present invention not only solves the problem of synergistic stress between recycled aluminum alloy pipe and fully recycled self-compacting expansive concrete, increases the stiffness and bearing capacity of the composite structure, and optimizes the cross-sectional utilization rate, but also comprehensively considers the structural design of the combination with the wall, thereby enhancing the overall stiffness and stability of the structure. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the first cross-sectional form of the composite column of the present invention.

[0021] Figure 2 This is a schematic diagram of the second cross-sectional form of the composite column of the present invention.

[0022] Figure 3 This is a schematic diagram of the overall three-dimensional structure of the composite column of the present invention.

[0023] Figure 4 for Figure 3 A schematic diagram of the L-shaped right-angle component.

[0024] In the picture:

[0025] 1. Square tube; 2. Arc-shaped partition; 3. Reinforcing connectors; 4. Box-type arch frame; 5. Fully recycled self-compacting expansive concrete;

[0026] 6. L-shaped right-angle component; 7. Connecting groove; 8. Hinge; 9. Opening hole; 10. Magnetic strip A; 11. Magnetic strip B. Detailed Implementation

[0027] The present invention will be further explained and described below with reference to the accompanying drawings and specific embodiments. It should be noted that the specific embodiments are not intended to limit the scope of the present invention.

[0028] like Figure 1 , Figure 3 and Figure 4 As shown, the detachable recycled aluminum alloy pipe and fully recycled self-compacting expansive concrete 5 combined column provided in this embodiment includes a square pipe made of recycled aluminum alloy material, arc-shaped partitions 2 set at the four corners of the square pipe, a box-shaped arch frame 4 set inside the square pipe, a plurality of stiffening connectors 3 set at intervals between the square pipe and the box-shaped arch frame 4, and fully recycled self-compacting expansive concrete 5.

[0029] In terms of cross-sectional geometry, this invention utilizes a cold-drawing process for recycled aluminum alloy to prefabricate integrated arc-shaped partitions 2 on the inner walls of both sides at the four corners of a square tube. These arc-shaped partitions 2 alleviate stress concentration at right angles and prevent bulging and tearing under stress. The arc-shaped partitions 2 are made of recycled aluminum alloy. The tangent points of the arc-shaped partitions 2 are tangent to two adjacent inner walls of the square tube, and their thickness is set according to the load-bearing requirements. Together with the square tube, they form a tight constraint on the internal concrete. This design of the arc-shaped partitions 2 transforms the traditional square cross-section logic into a "circle inside, square outside" stress pattern, changing the stress concentration at the corners of the square tube from a single point to a uniform distribution along the arc surface. This effectively suppresses the local bulging and tearing tendency of the recycled aluminum alloy tube wall under pressure, solving the performance defect of easy tearing at the corners of the square tube.

[0030] In terms of functional integration and maintenance design, the square tube includes a tube body and L-shaped right-angle components 6 detachably installed at the four corners of the tube body. One side of each L-shaped right-angle component 6 is hinged to the tube body via a hinge 8, and the other side is bonded with a magnetic strip A10 using epoxy resin. On the tube body side corresponding to the L-shaped right-angle component 6, a magnetic strip B11, which attracts the magnetic strip A10, is also bonded with epoxy resin. Utilizing the principle of magnetic attraction, the L-shaped right-angle components 6 are attracted and connected to the tube body to form a square tube. If the circuit needs maintenance, to facilitate opening and closing the L-shaped right-angle components 6 during maintenance, a circular opening hole 9 with a diameter of 15-30 mm is provided on the L-shaped right-angle component 6. The opening hole 9 allows external tools or fingers to be inserted to overcome the attraction between the magnetic strip A10 and the magnetic strip B11, thereby opening the L-shaped right-angle component 6.

[0031] Each arc-shaped partition 2 and each detachable L-shaped right-angle member 6 enclose a detachable pipeline concealment area extending along the pipe length. The detachable pipeline concealment area is not filled with fully recycled self-compacting expansive concrete 5. Utilizing the openable and closable characteristics of the L-shaped right-angle member 6, a concealed and easily accessible channel is provided for building pipelines such as power and communication lines, achieving a logical separation between structural stress and functional space.

[0032] Regarding the core reinforcement system, a box-shaped arch frame 4 is set at the center of the column in this embodiment. The central axis of the box-shaped arch frame 4 coincides with the central axis of the square tube, forming a multi-stress core. The box-shaped arch frame 4 is a double- or multi-cell rectangular structure, and is tightly connected to the square tube with thin aluminum plates. This "tube-in-tube" composite structure, together with the fully recycled self-compacting expansive concrete 5, forms a multi-constraint mechanism: the box-shaped arch frame 4, as the core stiffness skeleton, together with the arc-shaped partition 2 and the square tube, generates a strong clamping effect on the concrete between them, greatly improving the axial bearing capacity and bending stiffness of the composite column.

[0033] The stiffening connectors 3 are thin aluminum plates, arranged at equal or unequal intervals along the length of the square tube. They support the box-shaped arch frame 4 and transmit shear force, ensuring that the square tube and the box-shaped arch frame 4 deform together and preventing relative slippage or separation. Each stiffening connector 3 connects to the inner wall of the square tube and the outer wall of the box-shaped arch frame 4 at both ends. Fully recycled self-compacting expansive concrete 5 fills all the gaps formed by the outer side of the box-shaped arch frame 4, the side of the arc-shaped partition 2 facing the box-shaped arch frame 4, and the spaces between the multiple stiffening connectors 3. The fully recycled self-compacting expansive concrete 5 consists of water, cement, fly ash, recycled fine aggregate, recycled coarse aggregate, and a water-reducing agent. The amounts of each component are: water 196 kg / m³, cement 400 kg / m³, fly ash 116 kg / m³, recycled fine aggregate 827 kg / m³, recycled coarse aggregate 810 kg / m³, and the water-reducing agent is 0.5% of the total mass of cement and fly ash. Its high fluidity is used to fill (without vibration) the cross-sectional gap formed by the box-shaped arch frame 4 and the arc-shaped partition 2.

[0034] Working principle:

[0035] The detachable recycled aluminum alloy tube and fully recycled self-compacting expansive concrete 5-combination column provided in this embodiment is mainly used in structural columns and decorative columns in prefabricated and repairable building structures (such as civil buildings and public buildings).

[0036] During factory production, a square tube body with an arc-shaped partition 2, a box-shaped arch frame 4, multiple stiffening connectors 3 (thin aluminum plates), and four detachable L-shaped right-angle components 6 are prefabricated using a recycled aluminum alloy cold-drawing forming process. Hinges 8 are prefabricated on one side of the L-shaped right-angle component 6, and magnetic strips A10 and B11 are pre-attached to the corresponding positions on the other side and the square tube body using epoxy resin adhesive. Circular opening holes 9 with a diameter of 15-30mm are pre-drilled on the L-shaped right-angle component 6.

[0037] During on-site assembly, the box-shaped arch frame 4 is first placed inside the square tube, ensuring its central axis coincides with that of the square tube. Thin aluminum plates are used as stiffening connectors 3 to weld or bolt the box-shaped arch frame 4 to the inner wall of the square tube, ensuring a stable overall framework. Then, L-shaped right-angle members 6 are installed at the four corners of the tube using hinges 8, and the magnetic strips A10 and B11 are used to close them, forming a complete square tube cross-section. Next, fully recycled self-compacting expansive concrete 5 is poured through pre-reserved pouring ports on the top or side of the square tube. Utilizing the concrete's high fluidity, it automatically fills all gaps formed outside the box-shaped arch frame 4, on the side of the arc-shaped partition 2 facing the box-shaped arch frame 4, and between the multiple stiffening connectors 3, without the need for vibration. Because the fully recycled self-compacting expansive concrete 5 is multiplely constrained by the square tube, the arc-shaped partition 2, and the box-shaped arch frame 4, its compressive strength is significantly improved. Pressure is transferred to the box-shaped arch frame 4 and the square tube through the fully recycled self-compacting expansive concrete 5, thus forming a collaborative working mechanism of "concrete core under pressure - box-shaped arch frame 4 providing auxiliary load-bearing - square tube providing external constraint". It should be noted that the removable pipeline concealment area located between the arc-shaped partition 2 and the L-shaped right-angle member 6 is a reserved space for subsequent pipeline laying and does not require filling with concrete. On-site assembly is completed after pouring.

[0038] When electrical, communication, and other pipelines inside the building need to be laid or repaired, maintenance personnel insert their fingers or simple tools into the opening hole 9 on the L-shaped right-angle component 6 and apply outward pulling force to overcome the attraction between the magnetic strip A10 and the magnetic strip B11, thereby opening the L-shaped right-angle component 6. After the maintenance personnel have completed the pipeline laying or repair in the removable pipeline concealment area, they close the L-shaped right-angle component 6, and the magnetic strip A10 and its corresponding magnetic strip B automatically attract and reset, restoring the complete cross-sectional shape of the square tube.

[0039] As a second cross-sectional form in this embodiment, such as Figure 2 As shown, the only difference from the above structure is that the side of the square tube can be provided with an integrally formed connecting groove 7 for fitting into the building wall, according to the requirements of the building wall layout. This groove forms a tongue-and-groove nested connection with the wall, eliminating the need for post-installed tie bars and further enhancing the cooperative shear resistance between the column and the wall. This avoids the cumbersome rebar installation required in traditional connection methods and significantly enhances the cooperative shear resistance between the column and the wall, thereby ensuring the overall stiffness and stability of the building structure. The rest of the structure is exactly the same and will not be described again here.

Claims

1. A composite column of detachable recycled aluminum alloy pipe and fully recycled self-compacting expansive concrete, characterized in that, The device includes a square tube made of recycled aluminum alloy, arc-shaped partitions at the four corners of the square tube, a box-shaped arch frame inside the square tube, multiple stiffening connectors spaced between the square tube and the box-shaped arch frame, and fully recycled self-compacting expansive concrete. The two ends of each arc-shaped partition are respectively installed on the inner walls of the two sides forming the corner, and together with the inner walls of the two sides of the corner, they enclose a detachable pipeline hiding area extending along the length of the tube. The detachable pipeline hiding area is not filled with fully recycled self-compacting expansive concrete. The two ends of each stiffening connector are respectively connected to the inner wall of the square tube and the outer wall of the box-shaped arch frame. The fully recycled self-compacting expansive concrete fills all the gaps formed by the outer side of the box-shaped arch frame, the side of the arc-shaped partition facing the box-shaped arch frame, and the multiple stiffening connectors.

2. The detachable recycled aluminum alloy pipe and fully recycled self-compacting expansive concrete composite column according to claim 1, characterized in that, The square tube is provided with an integrally formed connecting groove for fitting and connecting with the building wall.

3. The detachable recycled aluminum alloy pipe and fully recycled self-compacting expansive concrete composite column according to claim 1, characterized in that, The box-shaped arch frame is a double- or multi-chamber rectangular structure, and its cross-sectional central axis coincides with the central axis of the square tube.

4. The detachable recycled aluminum alloy pipe and fully recycled self-compacting expansive concrete composite column according to claim 1, characterized in that, The stiffening connector is a thin aluminum plate, which is arranged at equal or unequal intervals along the length of the square tube.

5. The detachable recycled aluminum alloy pipe and fully recycled self-compacting expansive concrete composite column according to claim 1, characterized in that, The square tube includes a tube body and L-shaped right-angle members that can be detachably installed at the four corners of the tube body. One side of each L-shaped right-angle member is hinged to the tube body by a hinge, and the other side is provided with a magnetic strip A. A magnetic strip B that attracts the magnetic strip A is provided on the side of the tube body corresponding to the L-shaped right-angle member.

6. The composite column of detachable recycled aluminum alloy pipe and fully recycled self-compacting expansive concrete according to claim 5, characterized in that, The L-shaped right-angle component has at least one opening hole, which is a round hole with a diameter of 15~30mm.

7. The detachable recycled aluminum alloy pipe and fully recycled self-compacting expansive concrete composite column according to claim 1, characterized in that, The fully recycled self-compacting expansive concrete is composed of water, cement, fly ash, recycled fine aggregate, recycled coarse aggregate, and water-reducing agent. The dosage of each component is as follows: water 196 kg / m³, cement 400 kg / m³, fly ash 116 kg / m³, recycled fine aggregate 827 kg / m³, recycled coarse aggregate 810 kg / m³, and water-reducing agent is 0.5% of the total mass of cement and fly ash.

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