A fabricated bamboo-based composite frame beam-column joint based on a co-extrusion technology

Abstract

This utility model relates to the field of building structure engineering technology, specifically to a prefabricated bamboo-based composite frame beam-column joint based on co-extrusion technology. The joint connects bamboo-based composite columns and beams, comprising a hollow cylindrical steel section and two horizontal steel plates. The hollow cylindrical steel section is inserted into the bamboo-based composite column. The horizontal steel plates include a connecting section and an extension section. The connecting section is welded to the outside of the hollow cylindrical steel section, and the extension section, serving as a beam connection, is connected to the bamboo-based composite beam using high-strength bolts. The extension section covers the outside of the bamboo-based composite beam. The two horizontal steel plates are spaced apart, dividing the hollow cylindrical steel section into a middle column segment and two end column segments. The middle column segment of the hollow cylindrical steel section is bonded to the bamboo-based composite column using adhesive, and the end column segments are connected to the bamboo-based composite column using high-strength bolts. This utility model saves building space while reducing steel consumption and material costs.

Description

Technical Field

[0001] This utility model relates to the field of building structure engineering, specifically to a prefabricated bamboo-based composite frame beam-column joint based on co-extrusion technology. Background Technology

[0002] The construction industry plays an indispensable role in my country's steady economic growth and the improvement of urbanization. However, the traditional construction industry faces enormous resource and environmental challenges, which limit its sustainable development capabilities. Prefabricated construction, as an innovative model, has become a key force driving the transformation and upgrading of the construction industry and achieving green building goals. In recent years, prefabricated construction and its industrialization process have received high attention from governments at all levels. The intensive release of relevant policies and the gradual improvement of standards have a profound and positive impact on promoting the standardized development of my country's construction industry and facilitating the transformation of the construction industry from traditional construction models to modern industrialized construction models.

[0003] CN219690766U discloses a prefabricated bamboo-plastic composite frame structure beam-column node, specifically disclosing the connection of bamboo-plastic columns and bamboo-plastic beams through a connection node. The connection node includes a hollow rectangular steel, two inner partitions, and a beam connection part. Two inner partitions are set inside the hollow rectangular steel, and concrete is poured between the two inner partitions. The bamboo-plastic columns are inserted into the hollow rectangular steel, and the bamboo-plastic columns are connected to the hollow rectangular steel by high-strength bolts. The beam connection part includes a T-shaped plate at the top and an I-shaped plate at the bottom, and both the T-shaped plate and the I-shaped plate are welded to the outside of the hollow rectangular steel. The ends of the bamboo-plastic beams are provided with T-shaped grooves and I-shaped grooves. The T-shaped plates are inserted into the T-shaped grooves, and the I-shaped plates are inserted into the I-shaped grooves. Both the T-shaped plates and the I-shaped plates are connected to the bamboo-plastic beams by high-strength bolts. The beam-column joint uses hollow rectangular steel with concrete inside, and the beam is connected by T-shaped plates / I-shaped plates through slots. This has the following problems: 1. Large space occupation: the external joint (T-shaped plates / I-shaped plates protruding outwards) encroaches on the building's usable space and affects pipeline layout; 2. Insufficient stiffness: stress concentration in the rectangular steel section and low shear bearing capacity of the joint; 3. High material cost: additional steel plate connectors are required, resulting in a large amount of steel consumption. Summary of the Invention

[0004] The purpose of this invention is to overcome the defects and shortcomings of existing technologies and provide a prefabricated bamboo-based composite frame beam-column joint based on co-extrusion technology. This joint saves building space while improving the shear capacity and ductility coefficient of the joint, and also reduces steel consumption and material costs. Co-extrusion technology is an advanced material processing method that involves simultaneously extruding two or more materials with different properties, typically polymers or composite materials, in a molten state and forming them through a single mold to create a multi-layered composite product.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A prefabricated bamboo-based composite frame beam-column joint based on co-extrusion technology connects bamboo-based composite columns and beams via a connection node. The bamboo-based composite columns and beams are manufactured through co-extrusion molding. The connection node includes a hollow cylindrical steel and two horizontal steel plates. The hollow cylindrical steel is inserted into the bamboo-based composite column. The horizontal steel plates include a connecting section and an extension section. The connecting section of the horizontal steel plate is welded to the outside of the hollow cylindrical steel, and the extension section of the horizontal steel plate serves as a beam connection part, connected to the bamboo-based composite beam by high-strength bolts. The extension section of the horizontal steel plate covers the outside of the bamboo-based composite beam. The two horizontal steel plates are spaced apart, dividing the hollow cylindrical steel into a middle column section and two end column sections. The middle column section of the hollow cylindrical steel is bonded to the bamboo-based composite column by adhesive, and the end column sections of the hollow cylindrical steel are connected to the bamboo-based composite column by high-strength bolts.

[0007] As a preferred option, the connecting section and the extension section of the horizontal steel plate are integrally formed.

[0008] As a preferred option, the bamboo-based composite beam is an I-beam, with the flanges at both ends of the I-beam fixedly connected to the extensions of the horizontal steel plate.

[0009] As a preferred option, the number of bamboo-based composite columns is three, including an upper column and a lower column set on the outer side of the end column section of the hollow cylindrical steel, and an intermediate column set on the outer side of the middle column section of the hollow cylindrical steel.

[0010] As a preferred option, the horizontal steel plate connection section is connected to the hollow cylindrical steel using a full penetration weld.

[0011] As a preferred option, hollow cylindrical steel is welded from steel plates bent into a cylindrical shape.

[0012] As a preferred option, bamboo-based composite columns are used as structural load-bearing columns, with a lattice structure in cross-section.

[0013] As a preferred option, the inner edge of the bamboo-based composite column is reinforced with steel bars.

[0014] As a preferred option, bamboo-based composite beams serve as structural load-bearing beams with a lattice structure in their cross-section.

[0015] As a preferred option, steel bars are provided inside the flanges at both ends of the I-beam.

[0016] In summary, this utility model has the following advantages:

[0017] 1. This utility model eliminates the protruding structure of traditional external nodes through an embedded node design (the extension section covers the outside of the crossbeam), saving building space and facilitating pipeline passage and decorative layout. By using a circular cross-section for the hollow cylindrical steel, stress distribution is optimized. Combined with a dual fixing method of adhesive bonding in the middle section and bolt connection at the ends, the shear bearing capacity of the node is improved compared to traditional rectangular steel nodes. Hollow cylindrical steel and horizontal steel plates can be prefabricated in the factory, requiring only bolt connection on site. Compared to external nodes, this reduces welding, increases construction speed, and lowers material costs. The embedded node dissipates energy through plastic deformation, which can improve the ductility coefficient, meet the building requirements in high-intensity earthquake zones, and reduce the exposed steel area, thereby reducing the risk of environmental corrosion and extending the node's lifespan.

[0018] 2. The horizontal steel plate of this utility model is an integrally formed structure, which avoids stress concentration at the welded joints. Compared with the separate welded structure, which is prone to failure due to the weakening of the heat-affected zone, it can improve the overall strength of the horizontal steel plate and reduce the risk of fatigue cracking.

[0019] 3. The bamboo-based composite beam of this utility model is an I-beam, and the flange of the I-beam is connected to the extension of the horizontal steel plate by bolts, which makes the force transmission path direct and improves the bending moment bearing capacity at the beam end.

[0020] 4. This utility model divides the bamboo-based composite column into an upper column, a lower column, and a middle column to achieve segmented stress distribution, disperse the peak stress at the nodes, and reduce the stress concentration coefficient in the node area.

[0021] 5. The bamboo-based composite columns and beams of this utility model have a lattice cross section, which achieves a balance between lightweight and high rigidity. The hollow lattice can be filled with concrete or steel pipes to adapt to different load-bearing requirements and improve design flexibility.

[0022] 6. This utility model enhances the bending resistance of the I-beam flange by reinforcing steel bars, and reduces the beam end deflection of the bamboo-based composite beam by configuring steel bars, thereby improving the ultimate bearing capacity of the beam end of the bamboo-based composite beam, which is suitable for large-span structures.

[0023] 7. This utility model improves the compressive strength of the edge of the bamboo-based composite column by reinforcing steel bars, preventing local crushing of the bamboo-based composite column and improving the axial bearing capacity of the bamboo-based composite column.

[0024] 8. This utility model adopts a full penetration weld, which is an equal strength weld. The joint and the base material are of equal strength, so that the weld strength is consistent with the base material, avoiding incomplete fusion defects and extending the fatigue life of the joint.

[0025] 9. The cylindrical structure of this utility model has better torsional resistance than rectangular steel and higher torsional stiffness, making it suitable for wind-resistant design of high-rise buildings. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the connection node in Embodiment 1.

[0027] Figure 2 This is a schematic diagram of the internal structure of the beam-column joint of the prefabricated bamboo-based composite frame structure in Example 1.

[0028] Figure 3 This is a structural schematic diagram of the prefabricated bamboo-based composite frame beam-column joint based on co-extrusion technology in Example 1.

[0029] Figure 4 This is a cross-sectional view of the bamboo-based composite column of Example 1.

[0030] Figure 5 This is a cross-sectional view of the bamboo-based composite beam in Example 1.

[0031] Figure 6 This is a schematic diagram of the connection node in Embodiment 2.

[0032] Figure 7 This is a schematic diagram of the internal structure of the prefabricated bamboo-based composite frame beam-column joint based on co-extrusion technology in Example 2.

[0033] Figure 8 This is a structural schematic diagram of the prefabricated bamboo-based composite frame beam-column joint based on co-extrusion technology in Example 2.

[0034] Figure 9 This is a cross-sectional view of the bamboo-based composite column in Example 2.

[0035] Figure 10 This is a cross-sectional view of the bamboo-based composite beam in Example 2.

[0036] Among them, 1 is a hollow cylindrical steel, 2 is a horizontal steel plate, 3 is a bolt hole, and 4 is a reinforcing bar. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0038] Bamboo-based composites are high-performance composite materials made from bamboo as a base, combined with high-performance reinforcing materials (such as glass fiber, carbon fiber, and resin), and manufactured through processes such as prepreg technology, vacuum infusion, and compression molding. This material offers higher strength, stiffness, durability, and design flexibility. It not only retains the advantages of bamboo but also enhances its mechanical properties by adding other materials, making it suitable for applications requiring high resistance to compression and bending.

[0039] Example 1

[0040] like Figures 1 to 5 As shown, a prefabricated bamboo-based composite frame beam-column joint based on co-extrusion technology is disclosed. The bamboo-based composite columns and beams are fabricated through co-extrusion molding. The bamboo-based composite columns and beams are connected by a connection node, which includes a hollow cylindrical steel and two horizontal steel plates. The hollow cylindrical steel is inserted into the bamboo-based composite column. The horizontal steel plates include a connecting section and an extension section. The connecting section of the horizontal steel plate is welded to the outside of the hollow cylindrical steel, and the extension section of the horizontal steel plate serves as a beam connection part, connected to the bamboo-based composite beam by high-strength bolts. The extension section of the horizontal steel plate covers the outside of the bamboo-based composite beam. The two horizontal steel plates are spaced apart, dividing the hollow cylindrical steel into a middle column section and two end column sections. The middle column section of the hollow cylindrical steel is bonded to the bamboo-based composite column by adhesive, and the end column sections of the hollow cylindrical steel are connected to the bamboo-based composite column by high-strength bolts.

[0041] The connecting section and extension section of the horizontal steel plate are integrally formed.

[0042] The connecting section of the horizontal steel plate has the same dimensions as the cross-section of the bamboo-based composite column, and the extension section of the horizontal steel plate has the same dimensions as the upper and lower ends of the bamboo-based composite beam.

[0043] The bamboo-based composite beam is an I-beam, with the flanges at both ends of the I-beam fixedly connected to the extensions of a horizontal steel plate. The extensions of the horizontal steel plate have six small-diameter circular holes, and these holes are connected to the flanges at both ends of the I-beam using high-strength bolts.

[0044] The bamboo-based composite material support column consists of three columns: an upper column and a lower column located on the outer side of the end column section of the hollow cylindrical steel, and a middle column located on the outer side of the middle column section of the hollow cylindrical steel. The end column sections of the hollow cylindrical steel are bolted to the upper and lower columns of the bamboo-based composite material support column using high-strength bolts, while the middle column section of the hollow cylindrical steel is bonded to the middle column of the bamboo-based composite material support column using adhesive.

[0045] The horizontal steel plate has a large-diameter circular hole at the center of the connecting section. The hollow cylindrical steel is inserted into the circular hole, and the connecting section of the horizontal steel plate and the hollow cylindrical steel are connected by a full penetration weld.

[0046] Hollow cylindrical steel is made by welding steel plates bent into a cylindrical shape.

[0047] The bamboo-based composite column serves as a structural load-bearing column. Its cross-section is a lattice structure, comprising an inner bamboo-based composite material ring, an outer bamboo-based composite material ring, and multiple layers of bamboo-based composite material. The tubular inner bamboo-based composite material ring is located on the inside, and the tubular outer bamboo-based composite material ring is located on the outside. Multiple layers of bamboo-based composite material spacers are situated between the outer and inner rings. The outer end of each spacer connects to the inner side of the outer ring, and the inner end connects to the outer side of the inner ring, thus forming a lattice structure between the inner and outer rings. The inner bamboo-based composite material ring has a circular cross-section, while the outer bamboo-based composite material ring has a square cross-section. The bamboo-based composite material spacers are flat and run the entire length of the structural column. The lattice structure can remain hollow, or composite layers, such as concrete or steel pipe layers, can be incorporated within the inner bamboo-based composite material ring. In this embodiment, a steel reinforcement layer is provided within the lattice structure. The cross-section has a length of 200mm and a width of 200mm.

[0048] The bamboo-based composite beam serves as a structural load-bearing beam, with a lattice structure in its cross-section, meaning it's a hollow structure formed by the interlacing of bamboo-based composite materials. The lattice structure can remain hollow, or composite layers, such as concrete or steel pipe layers, can be incorporated within some of the lattices. These composite layers are placed at the top or bottom of the beam, where the load-bearing beam structure is subjected to tension or compression, thus improving the structural mechanical properties. In this embodiment, a steel reinforcement layer is incorporated within the lattice structure. The cross-section has a height of 300mm and a width of 200mm.

[0049] A connection method for beam-column joints in prefabricated bamboo-based composite frame based on co-extrusion technology is as follows:

[0050] A 6mm thick steel plate is bent into a cylindrical shape and welded along the longitudinal joint using a full-penetration weld to form a hollow cylindrical steel. The surface of the hollow cylindrical steel is sandblasted to increase the roughness of the bonding interface with the bamboo-based composite material. The connecting sections of horizontal steel plates are welded to the outside of the hollow cylindrical steel with full-penetration welds at 300mm intervals, dividing the hollow cylindrical steel into intermediate column sections. Epoxy resin structural adhesive is uniformly coated onto the inner wall of the intermediate column sections of the hollow cylindrical steel. The intermediate column of the bamboo-based composite material column is then fitted onto the outside of the intermediate column section of the hollow cylindrical steel, and pressure is applied for fixation and curing. Drill holes at the contact surface between the end section of the hollow cylindrical steel and the bamboo-based composite column. Fit the upper bamboo-based composite column onto the outside of the upper end section of the hollow cylindrical steel, and fit the lower bamboo-based composite column onto the outside of the lower end section of the hollow cylindrical steel. Install high-strength bolts and tighten them symmetrically to ensure uniform pressure distribution at the interface. Make bolt holes on the outside of the I-beam flange, aligning them with the bolt holes on the extension of the horizontal steel plate. Cover the outside of the I-beam flange with the extension of the horizontal steel plate, insert high-strength bolts, and tighten them to form a through-hole connection between the horizontal steel plate and the flange. Complete the beam-column connection.

[0051] Example 2

[0052] like Figures 6 to 10 As shown, in this embodiment, a concrete layer is installed within the lattice structure of the bamboo-based composite column. Reinforcing bars are installed along the inner edges of the bamboo-based composite column. The cross-section has a length of 200mm and a width of 200mm.

[0053] The bamboo-based composite beams have a lattice structure with a concrete layer inside. Reinforcing bars are embedded in the flanges at both ends of the I-beams. The cross-section has a height of 300mm and a width of 150mm.

[0054] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A prefabricated bamboo-based composite frame beam-column joint based on co-extrusion technology, which connects bamboo-based composite columns and bamboo-based composite beams through connection nodes, characterized in that: The bamboo-based composite columns and beams are manufactured through co-extrusion molding. The connecting nodes include hollow cylindrical steel and two horizontal steel plates. The hollow cylindrical steel is inserted into the bamboo-based composite column. The horizontal steel plates include a connecting section and an extension section. The connecting section of the horizontal steel plate is welded to the outside of the hollow cylindrical steel. The extension section of the horizontal steel plate serves as a beam connection and is connected to the bamboo-based composite beam via high-strength bolts. The extension section of the horizontal steel plate covers the outside of the bamboo-based composite beam. The two horizontal steel plates are spaced apart, dividing the hollow cylindrical steel into a middle column section and two end column sections. The middle column section of the hollow cylindrical steel is bonded to the bamboo-based composite column with adhesive, and the end column sections of the hollow cylindrical steel are connected to the bamboo-based composite column via high-strength bolts.

2. The prefabricated bamboo-based composite frame beam-column joint based on co-extrusion technology according to claim 1, characterized in that: The connecting section and extension section of the horizontal steel plate are integrally formed.

3. The prefabricated bamboo-based composite frame beam-column joint based on co-extrusion technology according to claim 1, characterized in that: The bamboo-based composite beams are I-beams, with the flanges at both ends of the I-beams fixedly connected to the extensions of the horizontal steel plates.

4. The prefabricated bamboo-based composite frame beam-column joint based on co-extrusion technology according to claim 1, characterized in that: The bamboo-based composite column consists of three columns: an upper column and a lower column located on the outer side of the end column section of the hollow cylindrical steel, and a middle column located on the outer side of the middle column section of the hollow cylindrical steel.

5. The prefabricated bamboo-based composite frame beam-column joint based on co-extrusion technology according to claim 1, characterized in that: Bamboo-based composite columns serve as structural load-bearing columns, with a lattice-structured cross-section.

6. The prefabricated bamboo-based composite frame beam-column joint based on co-extrusion technology according to claim 5, characterized in that: The bamboo-based composite column has steel bars installed along its inner edge.

7. The prefabricated bamboo-based composite frame beam-column joint based on co-extrusion technology according to claim 3, characterized in that: The bamboo-based composite beams serve as structural load-bearing beams, with a lattice structure in their cross-section.

8. The prefabricated bamboo-based composite frame beam-column joint based on co-extrusion technology according to claim 7, characterized in that: The flanges at both ends of the I-beam are reinforced with steel bars.

9. The prefabricated bamboo-based composite frame beam-column joint based on co-extrusion technology according to claim 1, characterized in that: The horizontal steel plate connecting section is connected to the hollow cylindrical steel using a full penetration weld.

10. A prefabricated bamboo-based composite frame beam-column joint based on co-extrusion technology according to claim 1, characterized in that: Hollow cylindrical steel is made by welding steel plates bent into a cylindrical shape.

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