A bamboo-based composite structure special-shaped combined column based on a co-extrusion technology
Bamboo-based composite irregular-shaped combined columns, manufactured using co-extrusion technology, solve the problems of insufficient shear resistance and space utilization of traditional columns, achieving uniform stress distribution and diversified connections, thereby improving the overall performance and seismic resistance of building structures.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SOUTH CHINA AGRICULTURAL UNIVERSITY
- Filing Date
- 2025-05-29
- Publication Date
- 2026-06-16
AI Technical Summary
Traditional building columns have shortcomings in shear resistance, joint force transmission, and space utilization, and the bamboo winding layer connection causes stress concentration and indirect joints.
The bamboo-based composite irregular-shaped column is made using co-extrusion technology. It combines bamboo-based composite irregular-shaped columns, steel pipes and concrete layers, and is designed with a "T"-shaped cross section. The overall performance of the structure is enhanced by the constraint of steel pipes and concrete, and the corners of the columns are rounded to distribute stress evenly.
It achieves uniform stress distribution, improved shear resistance, good structural ductility, and high space utilization. It can effectively absorb seismic energy, reduce weak points in the structure, and has diverse connection methods, saving space and facilitating pipeline layout.
Smart Images
Figure CN224363543U_ABST
Abstract
Description
Technical Field
[0001] This invention relates to structural load-bearing columns, specifically to a bamboo-based composite irregular-shaped combined column based on co-extrusion technology. Background Technology
[0002] In the field of building structures, columns, as key load-bearing components, have always been a focus of research in terms of performance and material selection. Traditional building column materials mainly include reinforced concrete and steel.
[0003] Concrete columns are widely used due to their relatively low cost and good compressive strength. However, they also have drawbacks such as high self-weight, poor tensile strength, and insufficient durability, which increases the burden on building foundations and limits their use in buildings with strict restrictions on structural self-weight.
[0004] Steel columns offer advantages such as high strength, good toughness, and fast construction speed. However, steel is susceptible to corrosion, requiring regular anti-corrosion maintenance, which incurs high maintenance costs. Furthermore, under high-temperature environments, the mechanical properties of steel decrease significantly, and its fire resistance is poor. In the event of a fire, steel columns are prone to deformation or even collapse, posing a threat to building safety.
[0005] In recent years, with the popularization of environmental protection concepts and the increasing demand for sustainable building materials, bamboo-based composite materials have begun to be used in the construction field. Bamboo has a short growth cycle, is a renewable resource, and has good mechanical properties. However, columns made solely of bamboo-based composite materials have shortcomings in terms of dimensional stability, durability, and aging resistance.
[0006] Meanwhile, with the development of the construction industry, people have increasingly higher requirements for architectural design and function. Traditional ordinary columns can no longer meet the complex and ever-changing architectural design needs, and irregularly shaped columns are gradually gaining attention due to their unique shapes and structural advantages. For example, in high-rise buildings, antique-style buildings, and some special-function buildings, irregularly shaped columns can better adapt to architectural shapes and spatial layouts. Based on the above technological background, bamboo-based composite material structural columns have emerged.
[0007] CN221878556U discloses a bamboo-based composite building column, including a column core, a bamboo winding layer, and a protective layer. The column core is composed of hollow round bamboo with alternating large and small ends. The bamboo winding layer wraps around the column core and is fixedly connected to it. The protective layer wraps around the bamboo winding layer and is fixedly connected to it. This bamboo-based composite building column relies on the natural good compressive strength along the grain of hollow round bamboo. Combined with bamboo winding technology, it can improve the overall compressive strength of the column and effectively dissipate energy. However, traditional cross-sectional shapes and connection methods have the following problems: 1. Insufficient shear resistance: The cross-sectional shape of rectangular columns has certain limitations in shear resistance. Under horizontal loads, the shear stress distribution is uneven, and stress concentration is likely to occur at the corners and other parts of the column, resulting in limited shear resistance. 2. Connections via bamboo winding layers lead to indirect force transmission at the nodes. 3. Traditional cross-sectional shapes result in wasted space utilization. Summary of the Invention
[0008] In view of the technical problems existing in the prior art, the purpose of this invention is to provide a bamboo-based composite irregular-shaped combined column based on co-extrusion technology that meets complex stress requirements.
[0009] To achieve the above objectives, the present invention adopts the following technical solution:
[0010] A bamboo-based composite irregular-shaped combined column based on co-extrusion technology, serving as a structural load-bearing column, includes a bamboo-based composite irregular-shaped column, steel pipes, and a concrete layer; the cross-section of the bamboo-based composite irregular-shaped column is "T"-shaped, with multiple steel pipes installed inside the bamboo-based composite irregular-shaped column, and a concrete layer inside the steel pipes.
[0011] As a preferred option, the cross-section of the bamboo-based composite irregular column includes a "T" shape consisting of a long side and a short side that are perpendicular to each other, with the short side located on one side of the middle of the long side; the steel pipes are round steel pipes, and there are four of them, with one steel pipe in the short side and three steel pipes in the long side, and the four steel pipes are arranged in a "T" shape.
[0012] As a preferred option, the bamboo-based composite irregular-shaped column has a lattice structure. The outer side of the bamboo-based composite irregular-shaped column is wrapped with an outer steel pipe, and steel pipe holes are set inside, with the steel pipes placed in the steel pipe holes. The corners of the bamboo-based composite irregular-shaped column are rounded.
[0013] As a preferred option, the bamboo-based composite irregular-shaped column is a solid structure. Within the solid structure, there is a ring of reinforcing bar holes parallel to the outer edge of the column, with reinforcing bars placed inside these holes. Steel pipe holes are also located inside the column, with steel pipes positioned within them. The corners of the column are rounded. The inner walls of the reinforcing bar holes protrude to form raised sections, which press the reinforcing bars firmly into the holes. Similarly, the inner walls of the steel pipe holes protrude to form corner protrusions, which press the steel pipe firmly into the holes. The corner protrusions have a semi-circular cross-section; multiple corner protrusions are provided corresponding to each steel pipe hole, evenly distributed along the inner wall of the hole, extending throughout the entire length of the hole.
[0014] As a preferred option, bamboo-based composite irregular-shaped columns are manufactured through co-extrusion molding.
[0015] The present invention has the following advantages:
[0016] 1. Uniform Stress Distribution: The cross-sectional shape of a bamboo-based composite irregular-shaped column based on co-extrusion technology is optimized according to its stress characteristics. Under load, its cross-sectional stress distribution is more uniform than that of a rectangular column. The special cross-sectional shape and the treatment of the curved column corners can avoid local failure caused by stress concentration. When subjected to horizontal wind loads or seismic loads, the irregular-shaped column can more evenly transfer the force to the foundation, reduce the weak points of the structure, and better utilize the mechanical properties of the material.
[0017] 2. The irregular column structure has good ductility. Combined with the gaps between fibers in the bamboo-based composite material, it can absorb and dissipate seismic energy through its own deformation during an earthquake, thereby reducing the structure's seismic response.
[0018] 3. Using irregular column structures allows for design based on the building's floor plan, enabling better integration with room corners and walls. For example, the cross-sectional width of the irregular column can match the wall thickness (e.g., a 200mm wall with a 200mm wide column), avoiding the column protruding from the wall and forming "edges," thus reducing wasted space. Secondly, the location and shape of the irregular column can be used to divide functional areas (e.g., a T-shaped column separates the living room and dining room), or the column's bends can guide the flow of movement.
[0019] 4. For lattice structures, using external steel pipes to constrain bamboo-based composite irregular columns can effectively reduce the possibility of local crushing failure due to excessively thin interlayers in the lattice section, while also constraining the internal structure and improving its ultimate bearing capacity.
[0020] 5. For solid structures, steel bars are arranged at the edges of the bamboo-based composite irregular columns, which can greatly enhance the bending and lateral resistance of the components and improve the ductility of the columns.
[0021] 6. For solid structures, corner protrusions are used to fix the internal steel pipes, reduce the possibility of slippage, and improve the synergistic effect between the steel pipes and bamboo-based composite materials.
[0022] 7. Both types of irregular columns adopted the treatment of embedded steel pipes. The branch steel pipes of the T-shaped section are used to resist the bending moment transmitted from the beam end and nodes, while the central steel pipe is used to resist the axial pressure, compressive stress caused by bending moment, and shear stress generated by torque transmitted from the superstructure. The steel pipe adopts a circular cross section, which can evenly distribute the force on the entire circumference when under pressure, making it less likely to cause stress concentration, and also has better torsional resistance.
[0023] 8. Both types of irregular columns are filled with concrete inside steel tubes, which can enhance axial compressive strength and provide structural stiffness. The concrete is constrained by the steel tubes, which further improves its load-bearing capacity.
[0024] 9. The two types of irregular columns can adopt a variety of connection node forms, and the steel plates can be directly welded to the nodes through the internal steel pipes to form embedded nodes, eliminating the protruding structure of the traditional external nodes, saving building space, and facilitating pipeline passage and decorative layout; at the same time, the force transmission is simpler and more direct. Attached Figure Description
[0025] Figure 1 This is a cross-sectional view of the lattice-structured irregular column in Example 1.
[0026] Figure 2 This is a three-dimensional view of the lattice-structured irregular column of Example 1.
[0027] Figure 3 This is a three-dimensional structural schematic diagram of the lattice-type irregular column in Example 1.
[0028] Figure 4 This is a cross-sectional view of the lattice-structured irregular column of Embodiment 1.
[0029] Figure 5 This is a cross-sectional view of the solid irregular column in Example 2.
[0030] Figure 6 This is a three-dimensional view of the solid irregular column in Embodiment 2.
[0031] Figure 7 This is a three-dimensional structural schematic diagram of the solid irregular column in Embodiment 2.
[0032] Figure 8 This is a cross-sectional view of the solid irregular column in Embodiment 2.
[0033] In the diagram, 1-lattice-type bamboo-based composite irregular column, 2-solid bamboo-based composite irregular column, 3-steel pipe, 4-reinforcing bar, 5-concrete layer, 6-arc-shaped column corner, 7-corner protrusion, 8-outer steel pipe. Detailed Implementation
[0034] The present invention will now be described in further detail with reference to specific embodiments.
[0035] Bamboo-based composites are high-performance composite materials made primarily of bamboo, combined with high-performance reinforcing materials such as resin and fibers (e.g., glass fiber, carbon fiber). They are manufactured using processes like prepreg technology, vacuum infusion, and compression molding. This material can be produced into products of various shapes and sizes using multiple processes, offering simple processing, low cost, and surface treatment options. It inherently provides heat and sound insulation, and the composite effect is even more significant, exhibiting higher strength, stiffness, and durability. The addition of other materials enhances its mechanical properties, making it suitable for applications requiring high resistance to compression and bending.
[0036] The bamboo-based composite material in this embodiment is a biodegradable composite material with a bamboo powder mass ratio of more than 65% and a plastic mass ratio of less than 30%, belonging to a bamboo powder high-filler composite material.
[0037] Example 1
[0038] Figure 1-4 As shown, a bamboo-based composite irregular-shaped combined column based on co-extrusion technology serves as a structural load-bearing column, comprising a bamboo-based composite irregular-shaped column, steel pipes, and a concrete layer; the cross-section of the bamboo-based composite irregular-shaped column is "T"-shaped, with multiple steel pipes installed inside the bamboo-based composite irregular-shaped column, and a concrete layer inside the steel pipes.
[0039] In the cross-section of the bamboo-based composite irregular-shaped column, the "T" shape includes mutually perpendicular long and short sides, with the short side located to one side of the middle of the long side. The steel pipes are round, and there are four pipes in total: one pipe in the short side and three pipes in the long side, arranged in a "T" shape. In this embodiment, the short side is a square with the steel pipe at its center, and the long side consists of three squares, with each of the three steel pipes located at the center of one of the three squares.
[0040] The bamboo-based composite irregular-shaped column has a lattice structure. The outer side of the column is wrapped with an outer steel pipe, and the steel pipe is installed in the holes inside the steel pipe. The corners of the bamboo-based composite irregular-shaped column are rounded, that is, both the outer steel pipe and the bamboo-based composite irregular-shaped column are rounded.
[0041] Bamboo-based composite irregular-shaped columns are manufactured through co-extrusion molding.
[0042] In this embodiment, the outer steel pipe is made by bending steel plates and then welding them; the steel pipe is made by bending steel plates and then welding them. Concrete is poured inside the steel pipe to form a concrete layer, and the concrete is constrained by the steel pipe to the core area of a bamboo-based composite irregular-shaped combined column based on co-extrusion technology.
[0043] Example 2
[0044] Figure 5-8 As shown, a bamboo-based composite irregular-shaped combined column based on co-extrusion technology serves as a structural load-bearing column, comprising a bamboo-based composite irregular-shaped column, steel pipes, and a concrete layer; the cross-section of the bamboo-based composite irregular-shaped column is "T"-shaped, with multiple steel pipes installed inside the bamboo-based composite irregular-shaped column, and a concrete layer inside the steel pipes.
[0045] In the cross-section of the bamboo-based composite irregular column, the "T" shape includes a long side and a short side that are perpendicular to each other. The short side is located on one side of the middle of the long side. The steel pipes are round steel pipes, and there are four of them. One steel pipe is installed in the short side and three steel pipes are installed in the long side. The four steel pipes are arranged in a "T" shape.
[0046] The bamboo-based composite irregular-shaped column is a solid structure. Inside the solid structure is a ring of reinforcing bar holes parallel to the outer edge of the column, with reinforcing bars placed within these holes. Steel pipe holes are also located inside the column, with steel pipes inserted within them. The corners of the column are rounded. The inner walls of the reinforcing bar holes bulge, forming raised sections that hold the reinforcing bars firmly within the holes. Similarly, the inner walls of the steel pipe holes bulge, forming corner protrusions that hold the steel pipe firmly within the holes. These corner protrusions have a semi-circular cross-section; multiple corner protrusions are provided for each steel pipe hole, evenly distributed along the inner wall of the hole and extending along its entire length.
[0047] Bamboo-based composite irregular-shaped columns are manufactured through co-extrusion molding.
[0048] In this embodiment, the steel pipe is made by bending steel plates and then welding them. The bamboo-based composite irregular-shaped column is manufactured through co-extrusion molding, and then assembled with reinforcing bars and steel pipes. Concrete is poured inside the steel pipe to form a concrete layer, and the concrete is constrained by the steel pipe to the core area of a bamboo-based composite irregular-shaped combined column based on co-extrusion technology.
[0049] In addition to the methods mentioned in the above embodiments, for solid bamboo-based composite irregular-shaped combined columns, the reinforcing bars can be co-extruded together with the bamboo-based composite irregular-shaped column. In this case, the inner wall of the reinforcing bar hole does not need to have a protruding part, but can directly fit with the reinforcing bar. These variations are all within the protection scope of this invention.
[0050] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.
Claims
1. A bamboo-based composite irregular-shaped combined column based on co-extrusion technology, used as a structural load-bearing column, characterized in that: It includes bamboo-based composite irregular-shaped columns, steel pipes, and a concrete layer; the cross-section of the bamboo-based composite irregular-shaped column is "T" shaped, and multiple steel pipes are set inside the bamboo-based composite irregular-shaped column, with a concrete layer inside the steel pipes.
2. A bamboo-based composite irregular-shaped combined column based on co-extrusion technology according to claim 1, characterized in that: In the cross-section of the bamboo-based composite irregular column, the "T" shape includes a long side and a short side that are perpendicular to each other. The short side is located on one side of the middle of the long side. The steel pipes are round steel pipes, and there are four of them. One steel pipe is installed in the short side and three steel pipes are installed in the long side. The four steel pipes are arranged in a "T" shape.
3. A bamboo-based composite irregular-shaped combined column based on co-extrusion technology according to claim 2, characterized in that: The bamboo-based composite irregular column has a lattice structure. The outer side of the bamboo-based composite irregular column is wrapped with an outer steel pipe, and the inside is set with steel pipe holes. The steel pipe is placed in the steel pipe holes.
4. A bamboo-based composite irregular-shaped combined column based on co-extrusion technology according to claim 3, characterized in that: The corners of the bamboo-based composite irregular-shaped columns are rounded.
5. A bamboo-based composite irregular-shaped combined column based on co-extrusion technology according to claim 2, characterized in that: The bamboo-based composite irregular-shaped column is a solid structure. Inside the solid structure is a ring of steel bar holes parallel to the outer edge of the bamboo-based composite irregular-shaped column, and steel bars are installed in the steel bar holes. The interior of the bamboo-based composite irregular-shaped column is provided with steel pipe holes, and steel pipes are installed in the steel pipe holes.
6. A bamboo-based composite irregular-shaped combined column based on co-extrusion technology according to claim 5, characterized in that: The corners of the bamboo-based composite irregular-shaped columns are rounded.
7. A bamboo-based composite irregular-shaped combined column based on co-extrusion technology according to claim 5, characterized in that: The inner wall of the rebar hole protrudes to form a raised part, which presses the rebar tightly inside the rebar hole.
8. A bamboo-based composite irregular-shaped combined column based on co-extrusion technology according to claim 5, characterized in that: The inner wall of the steel pipe hole protrudes to form a convex angle, which presses the steel pipe tightly inside the steel pipe hole.
9. A bamboo-based composite irregular-shaped combined column based on co-extrusion technology according to claim 8, characterized in that: The cross-section of the convex corner is semi-circular; multiple convex corners are provided for each steel pipe hole, and the circumference of the multiple convex corners is evenly distributed on the inner wall of the steel pipe hole, and the convex corners are set through the entire length of the steel pipe hole.
10. A bamboo-based composite irregular-shaped combined column based on co-extrusion technology according to claim 1, characterized in that: Bamboo-based composite irregular-shaped columns are manufactured through co-extrusion molding.