Round bamboo lengthening connecting structure
By using tenon joints and a core rod to fix the adhesive layer and fasteners, the problem of the length limitation of round bamboo is solved, and a high-strength connection structure is achieved, which is suitable for large structural components.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LISHUI KEMENG IND DESIGN CO LTD
- Filing Date
- 2025-07-02
- Publication Date
- 2026-05-15
AI Technical Summary
The limited length of natural round bamboo restricts its application in structures requiring long spans, large scales, or continuous components, and the strength of existing connection methods needs to be improved.
The mechanical interlocking connection of the first and second tenons, combined with the fixing of the core rod and adhesive layer, and the binding of fasteners, improves the stability and strength of the connection.
The compressive and tensile strength of the bamboo joints is significantly improved, and the connection stability and bending resistance are enhanced, meeting the requirements for use in large structures.
Smart Images
Figure CN224245194U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of bamboo processing, and in particular to a round bamboo elongation connection structure. Background Technology
[0002] Bamboo, as a fast-growing, renewable, high-strength, and aesthetically pleasing biomass material, is increasingly favored in the fields of architecture, structure, and design worldwide, especially in regions rich in bamboo resources. Its excellent mechanical properties, good toughness, and sustainability make it an ideal alternative to wood and even some metal materials, particularly aligning with current trends in green building and low-carbon development.
[0003] However, when natural round bamboo (such as moso bamboo) is used as a structural component, there is a significant natural limitation: the length of a single bamboo stalk is limited, and the usable length of mature bamboo is usually around 6 to 12 meters. This severely limits its application potential in structures requiring long spans, large scales, or continuous components, such as beams and columns of large stadiums, long-span bridges, the skeleton of high-rise buildings, or long decorative components.
[0004] To improve the adaptability of round bamboo, bolts and other methods are commonly used to lengthen and connect the bamboo, thereby increasing the overall length of the bamboo. However, the connection strength when using bolts and other methods still needs to be improved. Utility Model Content
[0005] To improve the strength and stability of the round bamboo joints, this application provides a round bamboo extension joint structure.
[0006] The technical solution adopted in this application is as follows:
[0007] An extended bamboo connecting structure includes a first bamboo body, a second bamboo body, and a core rod. One end of the first bamboo body is provided with a first tenon, which is spaced apart circumferentially along the first bamboo body, with adjacent tenons forming a first insertion cavity. One end of the second bamboo body is provided with a second tenon, which is spaced apart circumferentially along the second bamboo body, with adjacent second tenons forming a second insertion cavity for the first tenons to be inserted into, and the second tenons are inserted into the first insertion cavity. The core rod, the first tenons, and the second tenons are all coated with an adhesive layer. The core rod is inserted into the inner cavities of the first and second bamboo bodies. Fasteners are also provided at the connection between the first and second bamboo bodies.
[0008] By adopting the above technical solution, the two ends of the round bamboo are connected together by the cooperation of the first tenon and the second tenon, and the first tenon and the second tenon are connected together by the action of the adhesive layer; furthermore, the core rod is located in the inner cavity of the first tenon and the second tenon, and the compressive and tensile strength of the round bamboo connection is further improved by the action of the core rod, thereby further strengthening the connection stability of the round bamboo; finally, under the action of the fastener, the connection of the first tenon and the second tenon is reinforced, further improving the tensile and compressive strength of the round bamboo connection.
[0009] Optionally, the first insertion cavity has an flared structure from the surface of the first bamboo body towards the inner cavity of the first bamboo body, and the second tenon body is adapted to the first insertion cavity.
[0010] By adopting the above technical solution, the first insertion cavity and the second tenon cooperate with each other, so that after the first tenon is inserted into the first insertion cavity, the first tenon is not easy to shift in the first insertion cavity, thereby improving the stability of the connection between the two ends of the round bamboo.
[0011] Optionally, the ends of both the first tenon and the second tenon are connected to the bamboo joint.
[0012] By adopting the above technical solution, the ends of the first tenon and the second tenon are connected to the bamboo joint, thereby further improving the stability of the first tenon and the second tenon, making the first tenon and the second tenon less prone to twisting and bending, and also making the first tenon and the second tenon less likely to cause cracks on the surface of the round bamboo.
[0013] Optionally, the sidewall of the core rod is provided with two annular protrusions, the outer diameter of the annular protrusions being larger than that of the core rod, and there is a gap between the surface of the core rod and the inner wall of the first bamboo body and the second bamboo body.
[0014] By adopting the above technical solution, the outer walls on both sides of the core rod have annular protrusions. Under the action of the annular protrusions, the tensile strength of the two round bamboos connected together is further improved. Furthermore, under the action of the annular protrusions, there is a certain gap between the surface of the core rod and the inner wall of the round bamboo, which improves the bending resistance of the connection of the round bamboos.
[0015] Optionally, when the first bamboo body and the second bamboo body are connected, the end of the core rod abuts against the bamboo node.
[0016] By adopting the above technical solution, the first tenon and the second tenon abut against the bamboo joint, thereby improving the support strength of the round bamboo joint.
[0017] Optionally, the fastener includes a flexible strip that is wrapped around the outer wall of the connection between the first bamboo body and the second bamboo body.
[0018] By adopting the above technical solution, the connection of the round bamboo is reinforced by flexible strips, which further improves the connection stability and enhances the performance in terms of bending strength and node slippage.
[0019] Optionally, the flexible strip is selected from bamboo strips.
[0020] By adopting the above technical solutions, the materials are more environmentally friendly and have good flexibility and strength.
[0021] Optionally, both the inner walls of the first tenon and the second tenon are provided with slots, and an abutment rod is provided between the two annular protrusions, the abutment rod being glued to the slot.
[0022] By adopting the above technical solution, the abutment rod can abut against the annular protrusion under the action of the abutment rod, thus further improving the overall tensile strength of the connection.
[0023] In summary, this application includes at least one of the following beneficial effects:
[0024] 1. In this application, round bamboo is connected by using a first tenon and a second tenon. The first and second tenons resist axial pressure or tension, and a core rod is installed in the inner cavity of the connection to bear the bending moment, further improving the bending strength of the connection. After each connection surface is glued together with an adhesive layer, a flexible strip is finally tied at the connection, and the flexible strip is also coated with sufficient adhesive to further reinforce the connection and suppress radial cracking. Through the solution of this application, the stability and bending strength of the connection are improved after the round bamboo is lengthened, expanding its application scenarios. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this application;
[0026] Figure 2 This is an exploded view of Embodiment 1 of this application;
[0027] Figure 3 This is a schematic diagram of Embodiment 2 of this application.
[0028] Explanation of reference numerals in the attached drawings: 1. First bamboo body; 2. Second bamboo body; 3. First tenon; 4. Second tenon; 5. First insertion cavity; 6. Second insertion cavity; 7. Core rod; 8. Fastener; 81. Flexible strip; 9. Ring protrusion; 10. Groove; 11. Abutment rod. Detailed Implementation
[0029] The present application will be further described in detail below with reference to the accompanying drawings.
[0030] Example 1
[0031] This application discloses an extended connecting structure for round bamboo. (Refer to...) Figure 1 and Figure 2 The extended bamboo connecting structure includes a first bamboo body 1 and a second bamboo body 2. A first tenon 3 is provided at one end of the first bamboo body 1, and multiple tenons 3 are evenly arranged along the circumference of the first bamboo body 1. A distance is left between adjacent first tenons 3, thus forming a first insertion cavity 5. A second tenon 4 is provided at one end of the second bamboo body 2, and multiple second tenons 4 are evenly arranged along the circumference of the second bamboo body 2. A distance is left between adjacent second tenons 4, thus forming a second insertion cavity 6.
[0032] When the first bamboo body 1 and the second bamboo body 2 are connected, the first tenon 3 is inserted into the second insertion cavity 6, and the second tenon 4 is inserted into the first insertion cavity 5, thereby forming a mechanically interlocked pre-fixed structure at the connection. The surfaces of the first tenon 3 and the second tenon 4, as well as the inner walls of the first insertion cavity 5 and the second insertion cavity 6, are coated with a sufficient amount of adhesive, such as epoxy resin adhesive. After the adhesive cures, it provides a stable connection at the joint.
[0033] Furthermore, the connecting structure also includes a core rod 7, which is located in the inner cavity at the connection between the first tenon 3 and the second tenon 4. The core rod 7 is a cylindrical structure, and its diameter is smaller than the inner diameter of the round bamboo, for example, between 2-3 mm. Sufficient glue is also applied between the surface of the core rod 7 and the inner wall of the round bamboo, thereby connecting the core rod 7 to the first tenon 3 and the second tenon 4, further improving the connection strength between the first bamboo body 1 and the second bamboo body 2. The surface of the core rod 7 can also have a rough structure, such as a textured pattern, to improve the connection strength. The two ends of the core rod 7 abut against the bamboo nodes, and sufficient glue is also applied to the end faces of the core rod 7.
[0034] Furthermore, to improve the stability of the connection between the first bamboo body 1 and the second bamboo body 2, two annular protrusions 9 are fixed to the outer wall of the core rod 7. These two annular protrusions 9 can abut against the inner wall of the round bamboo. Adhesive is also applied to the annular protrusions 9 to enhance the connection strength with the first tenon 3 and the second tenon 4. Furthermore, the two annular protrusions 9 further improve the bending resistance of the first bamboo body 1 and the second bamboo body 2 after connection. The core rod 7 can be made of wood or engineering plastic and possesses a certain degree of bending capability. Under the action of the annular protrusions 9, when the extended round bamboo is bent, the core rod provides bending moment, making the connection less prone to breakage.
[0035] Reference Figure 2The ends of both the first tenon 3 and the second tenon 4 are connected to the nodes of the round bamboo. Under the action of the bamboo nodes, the strength of the first tenon 3 and the second tenon 4 is improved. Furthermore, the first insertion cavity 5 has a flared structure in the direction of the inner cavity of the first bamboo body 1; that is, the first insertion cavity 5 has a flared structure from the surface of the first bamboo body 1 towards the inner cavity of the first bamboo body 1. The shape of the second tenon 4 is adapted to the first insertion cavity 5, making it less prone to displacement after the second tenon 4 is inserted into the first insertion cavity 5. Moreover, when the first tenon 3 is inserted into the second insertion cavity 6, its end abuts against the bamboo node; when the second tenon 4 is inserted into the first insertion cavity 5, its end also abuts against the bamboo node, thereby improving the overall support strength.
[0036] Furthermore, refer to Figure 1 and Figure 2 A fastener 8 is provided at the connection between the first bamboo body 1 and the second bamboo body 2. The fastener 8 is a flexible strip 81. In this embodiment, the flexible strip 81 can be selected from bamboo strips. After the surface of the bamboo strip is impregnated with glue, it is wrapped around the surface of the first bamboo body 1 and the second bamboo body 2 and tied, thereby further improving the connection strength and bending resistance of the connection.
[0037] The implementation principle of the extended round bamboo connection structure in this application is as follows: the first bamboo body 1 and the second bamboo body 2 are fixed by mechanical interlocking of the first tenon 3 and the second tenon 4. A core rod 7 is installed in the inner cavity of the connection to improve the stability and deformation resistance of the connection. Finally, bamboo strips are bound to the connection, and these strips are also coated with adhesive to further improve the fastening effect of the connection and reduce the risk of radial cracking. After testing, the bending strength of the extended round bamboo in this application can reach 89 MPa, while the standard is 70 MPa, thus meeting the usage requirements. Furthermore, the tensile strength of the round bamboo in this application reaches over 85 kN, while the tensile strength of traditional connection methods is generally less than 50 kN.
[0038] Example 2
[0039] The difference between this embodiment and Embodiment 1 is that at least one abutting rod 11 is provided between the two annular protrusions 9, and the inner wall of the second tenon 4 is provided with a slot 10 for the abutting rod 11 to abut in. The abutting rod 11 can abut in the slot 10. The slot 10 and the surface of the abutting rod 11 are also coated with glue, thereby connecting the abutting rod to the second tenon 4 and further improving the tensile strength.
[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A round bamboo extension connection structure, characterized in that: The bamboo body includes a first bamboo body (1), a second bamboo body (2), and a core rod (7). One end of the first bamboo body (1) is provided with a first tenon (3), which is spaced apart around the first bamboo body (1). Adjacent first tenons (3) form a first insertion cavity (5). One end of the second bamboo body (2) is provided with a second tenon (4), which is spaced apart around the second bamboo body (2). Adjacent second tenons (4) form a second insertion cavity (6) for the first tenon (3) to be inserted into, and the second tenon (4) is inserted into the first insertion cavity (5). The core rod (7), the first tenon (3), and the second tenon (4) are all coated with an adhesive layer. The core rod (7) is inserted into the inner cavity of the first bamboo body (1) and the second bamboo body (2). Fasteners (8) are also provided at the connection between the first bamboo body (1) and the second bamboo body (2).
2. The round bamboo extension connection structure according to claim 1, characterized in that: The first insertion cavity (5) has an flared structure from the surface of the first bamboo body (1) toward the inner cavity of the first bamboo body (1), and the second tenon (4) is adapted to the first insertion cavity (5).
3. The round bamboo extension connection structure according to claim 2, characterized in that: The ends of the first tenon (3) and the second tenon (4) are both connected to the bamboo joint.
4. The round bamboo extension connection structure according to claim 2, characterized in that: The core rod (7) has two annular protrusions (9) on its side wall. The outer diameter of the annular protrusions (9) is larger than that of the core rod (7). There is a gap between the surface of the core rod (7) and the inner walls of the first bamboo body (1) and the second bamboo body (2).
5. The round bamboo extension connection structure according to claim 4, characterized in that: When the first bamboo body (1) and the second bamboo body (2) are connected, the end of the core rod (7) abuts against the bamboo node.
6. The round bamboo extension connection structure according to claim 4, characterized in that: When the first tenon (3) is inserted into the second insertion cavity (6), the end of the first tenon (3) abuts against the bamboo node of the second bamboo body (2). When the second tenon (4) is inserted into the first insertion cavity (5), the end of the second tenon (4) abuts against the bamboo node of the first bamboo body (1).
7. The round bamboo extension connection structure according to claim 4, characterized in that: The fastener (8) includes a flexible strip (81) which is wrapped around the outer wall of the connection between the first bamboo body (1) and the second bamboo body (2).
8. The round bamboo extension connection structure according to claim 7, characterized in that: The flexible strip (81) is selected from bamboo strips.
9. The round bamboo extension connection structure according to claim 4, characterized in that: The inner walls of the first tenon (3) and the second tenon (4) are provided with slots (10), and an abutment rod (11) is provided between the two annular protrusions (9). The abutment rod (11) is glued to the slot (10).