Round bamboo structure splicing joint adopting plastic cup sleeve and PVC (polyvinyl chloride) lining and manufacturing method of round bamboo structure splicing joint

Abstract

The invention discloses a round bamboo structure splicing joint adopting a plastic cup sleeve and a PVC lining and a manufacturing method of the round bamboo structure splicing joint. The splicing joint comprises two round bamboo stalks, two round bamboo tubes are defined by the splicing ends of the two round bamboo stalks, and internal cavities are defined in the round bamboo tubes; the inner surface and the outer surface of the plastic cup sleeve are evenly coated with resin to serve as structural adhesive, the plastic cup sleeve is arranged in the inner cavity of the two round bamboo tubes, and the inner cavity is defined in the plastic cup sleeve; an inner cavity is defined in the PVC inner lining pipe, and the PVC inner lining pipe is arranged in the plastic cup sleeve to define an inner cavity; the metal connecting pieces can be screws or bolts, and the metal connecting pieces are arranged in a crossed mode and penetrate through the PVC lining pipe, the plastic cup sleeve and the round bamboo pipe. According to the bamboo tube splicing joint with the plastic cup sleeve and the PVC lining, crack expansion of bamboo wood in the stress process can be effectively restrained, meanwhile, the bearing capacity, the bending resistance and the torsion resistance of the bamboo tube are remarkably improved, and structural stress is more stable.

Description

Technical Field

[0001] The invention relates to the field of civil engineering, and in particular to a novel round bamboo splicing node and a manufacturing method thereof. Background Art

[0002] With the introduction of green building and sustainable development concepts, round bamboo, as a renewable, low-carbon and environmentally friendly building material, is increasingly being used in the construction field. Round bamboo has excellent mechanical properties and rapid growth characteristics, making it an ideal alternative building material. However, the connection parts of round bamboo in structural applications are prone to problems such as uneven force and cracking, especially the compression, tension and torsion resistance of the splicing nodes are relatively weak. Most of the existing round bamboo structure node designs use traditional bolt connection methods, which easily lead to local stress concentration and reduce the durability and stability of the nodes.

[0003] The present invention aims to solve the deficiencies of the joint nodes of round bamboo structures in terms of compression resistance, tension resistance and torsion resistance, and proposes a new joint node design, which improves the overall mechanical properties of the node by adopting a multi-material composite method. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a bamboo tube splicing node using a plastic cup sleeve and a PVC lining, which can effectively inhibit the expansion of cracks in the bamboo material during stress, and at the same time significantly improve the bearing capacity, bending resistance and torsion resistance of the bamboo tube, making the structure more stable under stress.

[0005] According to an embodiment of the present invention, a round bamboo structure splicing node using a plastic cup sleeve and a PVC liner includes: two round bamboo stalks, the splicing ends of the two round bamboo stalks define two round bamboo tubes, and the round bamboo tubes define an internal cavity; a plastic cup sleeve, the inner and outer surfaces of the plastic cup sleeve are evenly coated with resin as a structural adhesive, specifically, the resin includes at least one of epoxy resin, polyurethane resin and bio-based resin, the plastic cup sleeve is arranged in the internal cavity of the two round bamboo tubes, and the plastic cup sleeve defines an internal cavity; a PVC liner tube, the PVC liner tube defines an internal cavity, and the PVC liner tube is arranged in the plastic cup sleeve to define an internal cavity; a metal connector, the metal connector can be a screw or a bolt, which is cross-arranged to pass through the PVC liner tube, the plastic cup sleeve and the round bamboo tube.

[0006] According to the embodiment of the present invention, by using a plastic cup sleeve to bond the PVC liner tube and the round bamboo tube, and cross-arranging the multiple designs of metal connectors, the further cracking of the bamboo tube under stress is effectively suppressed, the comprehensive mechanical properties of the bamboo tube are improved, and the bearing capacity and deformation capacity of the bamboo tube are significantly improved, making its stress performance more stable. At the same time, the plastic cup sleeve has the characteristics of being lightweight and is nested between the PVC tube and the bamboo material to reduce its own weight, provide internal support, and buffer stress transfer to avoid local stress concentration. The PVC tube lining provides basic internal support, especially at the node connection part, which helps to improve the rigidity of the node. The metal connector can transmit the shear force on the round bamboo tube, and at the same time fix the position of the plastic cup sleeve and the PVC liner tube to prevent movement. A spring gasket is provided between the bolt and the bamboo tube to provide additional buffering and tightening effects, prevent the bolt from damaging the bamboo material during the tightening process, and ensure the long-term stability of the node connection.

[0007] In some embodiments of the present invention, the larger dimension of the outer diameter of the two round bamboo tubes at the joint of the round bamboo stalks is D, the smaller dimension of the inner diameter is D1, and the smaller dimension of the length of the internal cavity is L. The plastic cup sleeve is similar to the structure of a drinking cup, with one end closed (closed end) and the other end open (open end). The outer diameter of the open end is D1, and the inner diameter is 4mm smaller than D1 (i.e., D1-4mm); the outer diameter of the closed end is D1-1mm, and the bottom of the closed end inside the cup sleeve forms a circular cross-section with a diameter of D1-5mm. The plastic cup sleeve is arranged in the internal cavity of the two round bamboo tubes, and the length of the plastic cup sleeve is l, not exceeding L. The open end is flush with the end surface of the bamboo tube and is not exposed, and the closed end is inserted into the internal cavity of the bamboo tube. The outer diameter of the PVC inner tube is not greater than D1-5mm, and is arranged inside the two plastic cup sleeves. The length of the PVC inner tube is 2l, which is just evenly separated by the two plastic cup sleeves.

[0008] In some embodiments of the present invention, the outer diameter of the two round bamboo tubes at the joint of the round bamboo stalks is the larger one D, the diameter of the metal connecting piece is d and the length is greater than D, and it is symmetrically arranged crosswise between the two round bamboo tubes.

[0009] In some embodiments of the present invention, the metal connectors are bolts, which are at least 6d away from the ends of the bamboo tubes, arranged in a cross-shaped symmetrical pattern, and the distance between adjacent metal connectors is not less than 5d.

[0010] In some embodiments of the present invention, the metal connectors are screws, which are no less than 8d away from the ends of the bamboo tubes. The number of screws is 2n, and they are staggered along the circumferential direction of the two circular bamboo walls, and are evenly and symmetrically arranged around the circumference every 360 / n° in the circular direction of the bamboo wall. The distance between adjacent metal connectors is no less than 4d.

[0011] According to some embodiments of the present invention, a method for manufacturing a round bamboo structure splicing node using a plastic cup sleeve and a PVC liner comprises the following steps:

[0012] S10, the two round bamboo stalks are placed in a relative manner in a transverse manner, so that the internal cavities defined by the two round bamboo tubes at the joint of the round bamboo stalks are relative and aligned, so as to facilitate the splicing;

[0013] S20, evenly apply resin glue on the outer surface of the plastic cup sleeve, insert the closed end of the plastic cup sleeve into the inner cavity of the bamboo tube first, and push it along the insertion direction. When the open end of the plastic cup sleeve is flush with the end surface of the bamboo tube, stop inserting, and the open end is not exposed. Let it stand and wait for the colloid to solidify to form a whole-coated reinforcement area;

[0014] S30, apply glue evenly inside the two plastic cup sleeves, insert the PVC inner lining tube into the inner cavity of the first plastic cup sleeve until the PVC inner lining tube touches the bottom surface of the cup sleeve. Thereafter, continue to insert the PVC inner lining tube into the second plastic cup sleeve, and when the two round bamboo tubes are almost seamlessly attached, the installation is completed;

[0015] S40, marking the punching positions on the two round bamboo tubes, and first punching holes in one of the round bamboo tubes in sequence according to the marked punching positions, and passing through the round bamboo tube, the plastic cup sleeve, and the internal PVC liner tube during the punching process, and then fixing the holes according to the type of the metal connector after passing through the round bamboo tube;

[0016] S41, the metal connector is a bolt, after drilling, the bolt is placed in the hole, spring washers are placed in turn and fixed with nuts, and after each metal connector is installed, the next hole is drilled and installed, until all the metal connectors of the bamboo tube are installed;

[0017] S42, the metal connector is a screw, and after drilling, the screw is directly screwed in and fixed. After each metal connector is installed, the next hole is drilled and installed until all the metal connectors of the bamboo tube are installed.

[0018] Additional advantages and features of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1Schematic diagram of a method for manufacturing a circular bamboo structure joint node using a plastic cup sleeve and a PVC liner according to Example 1 of the present invention, showing a joint node connected by 6 bolts, wherein the bolts are cross-shaped and symmetrically arranged outside the circular bamboo tube, with a bolt end distance of 6d and a spacing of 5d;

[0021] Figure 2 1 is a schematic diagram of a splicing node of a round bamboo structure using a plastic cup sleeve and a PVC liner according to Example 1 of the present invention, showing a splicing node connected by 8 screws, the screws are staggered along the circumference of the two round bamboo walls, and are evenly and symmetrically arranged around the circumference of the bamboo wall every 360 / 4° in the direction of the bamboo wall ring, with a screw end distance of 8d and a spacing of 4d;

[0022] Figure 3 It is a flow chart of a method for manufacturing a round bamboo structure joint node using a plastic cup sleeve and a PVC liner.

[0023] Reference numerals

[0024] FRP reinforced and PVC lined round bamboo structure joints 100;

[0025] Round bamboo tube 1;

[0026] Plastic cup sleeve 2;

[0027] PVC lined pipe 3;

[0028] Metal connecting piece (bolt / screw) 4; spring washer 41; nut 42. DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Reference below Figure 1 The embodiment of a round bamboo structure joint node 100 using FRP reinforcement and PVC lining according to the present invention is described. The embodiment comprises: two round bamboo tubes 1, two plastic cup sleeves 2; PVC lining tube 3; metal connector (bolt / screw) 4; spring washer 41; nut 42.

[0033] like Figure 1 As shown, the round bamboo tube 1 defines an internal cavity, and two plastic cup sleeves 2 are arranged in the internal cavities of the two round bamboo tubes 1. The two plastic cup sleeves 2 define two internal cavities, and the PVC liner tube 3 is arranged in the cavity defined inside the plastic cup sleeve 2. The plastic cup sleeve 2 has the characteristics of being lightweight and is nested between the PVC liner tube 3 and the bamboo material to reduce its own weight, provide internal support, and buffer stress transfer to avoid local stress concentration. The PVC liner tube 3 provides basic internal support, especially at the node connection part, which helps to improve the rigidity of the node.

[0034] like Figure 1As shown, the metal connector 4 includes screws or bolts, which are arranged crosswise and penetrate the PVC inner liner tube 3, the plastic cup sleeve 2 and the round bamboo tube 1. The metal connector is installed in a crosswise arrangement, so that the metal connector 4 can be fixed on the round bamboo tube 1, transmitting the force on the round bamboo tube 1, playing a role similar to a bamboo node, and fixing the position of the plastic cup sleeve 2 and the PVC inner liner tube 3 to prevent movement. A spring washer 41 is provided between the bolt and the bamboo tube 1 to provide additional buffering and tightening effects, prevent the bolt from damaging the bamboo material during the tightening process, and ensure the long-term stability of the node connection.

[0035] like Figure 1 As shown, the larger dimension of the outer diameter of the two round bamboo tubes 1 at the joint of the round bamboo stalks is D, the smaller dimension of the inner diameter is D1, and the smaller dimension of the length of the internal cavity is L. The plastic cup sleeve 2 is similar to the structure of a drinking cup, one end of which is closed (closed end) and the other end is open (open end). The outer diameter of the open end is D1, and the inner diameter is 4mm smaller than D1 (i.e., D1-4mm); the outer diameter of the closed end is D1-1mm, and the bottom of the closed end inside the cup sleeve 2 forms a circular cross-section with a diameter of D1-5mm. The plastic cup sleeve 2 is arranged in the internal cavity of the two round bamboo tubes 1, and the length of the plastic cup sleeve 2 is l, not exceeding L. The open end is flush with the end surface of the bamboo tube 1 and is not exposed, and the closed end is inserted into the internal cavity of the bamboo tube 1. The outer diameter of the PVC inner liner 3 is not greater than D1-5mm, and is arranged inside the two plastic cup sleeves 2. The length of the PVC inner liner 3 is 2l, which is just evenly separated by the two plastic cup sleeves 2.

[0036] like Figure 1 As shown, the inner and outer surfaces of the plastic cup sleeve 2 are uniformly coated with resin as a structural adhesive. Specifically, the resin includes at least one of epoxy resin, polyurethane resin and bio-based resin.

[0037] like Figure 1 As shown, the outer diameter of the two round bamboo tubes 1 at the joint of the round bamboo stalks is the larger one D, and the metal connecting piece 4 has a diameter d and a length greater than D, and is cross-arranged between the two round bamboo tubes 1 in a symmetrical manner.

[0038] like Figure 1 As shown, the metal connector 4 is a bolt, which is not less than 6d away from the end of the bamboo tube 1, arranged in a cross-shaped symmetrical manner, and the distance between adjacent metal connectors 4 is not less than 5d.

[0039] According to the following Figure 1 As shown, a method for manufacturing a round bamboo structure joint 100 using a plastic cup sleeve 2 and a PVC liner tube 3 according to an embodiment of the present invention is described. The manufacturing method includes the following steps:

[0040] S10, two round bamboo stalks 1 are placed in a relative manner in a transverse manner, so that the internal cavities defined by the two round bamboo tubes 1 at the joint of the round bamboo stalks 1 are relative and aligned, so as to facilitate the splicing;

[0041] S20, evenly apply resin glue on the outer surface of the plastic cup sleeve 2, insert the closed end of the plastic cup sleeve 2 into the inner cavity of the bamboo tube 1 first, and push it along the insertion direction. When the open end of the plastic cup sleeve 2 is flush with the end surface of the bamboo tube 1, stop inserting, and the open end is not exposed. Let it stand and wait for the glue to solidify to form a whole-coated reinforcement area;

[0042] S30, apply glue evenly inside the two plastic cup sleeves 2, and insert the PVC inner lining tube 3 into the inner cavity of the first plastic cup sleeve 2 until the PVC inner lining tube 3 touches the bottom surface of the plastic cup sleeve 2. Thereafter, continue to insert the PVC inner lining tube 3 into the second plastic cup sleeve 2, and when the two round bamboo tubes 1 are almost seamlessly attached, the installation is completed;

[0043] S40, marking the punching positions on the two round bamboo tubes 1, and first punching holes in one of the round bamboo tubes 1 according to the marked punching positions, passing through the round bamboo tube 1, the plastic cup sleeve 2, and the internal PVC liner tube 3 during the punching process, and then fixing the round bamboo tube 1 according to the type of the metal connector 4 after passing through the round bamboo tube 1.

[0044] S41, the metal connector 4 is a bolt, after drilling, the bolt is put into the hole, and the spring washer 41 is put in turn and fixed with the nut 42. After each metal connector 4 is installed, the next hole is drilled and installed until all the metal connectors 4 of the round bamboo tube 1 are installed;

[0045] S42, the metal connector 4 is a screw, and the screw is directly screwed in and fixed after drilling. After each metal connector 4 is installed, the next hole is drilled and installed until all the metal connectors 4 of the round bamboo tube 1 are installed.

[0046] Figure 1 The present invention demonstrates a manufacturing method of a circular bamboo structure joint node 100 with FRP reinforcement and PVC lining. By adjusting and changing the number and position of the metal connectors 5, a variety of connection methods can be formed to meet the construction requirements in different scenarios, thereby ensuring the simplicity of construction while reducing the project cost and improving the comprehensive stability and safety of the structure.

[0047] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0048] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A round bamboo structure joint using a plastic cup sleeve and a PVC lining, characterized in that: include: Two round bamboo stalks, the joint ends of the two round bamboo stalks define two round bamboo tubes, and the insides of the round bamboo tubes define an internal cavity; A plastic cup sleeve, the plastic cup sleeve is arranged in the inner cavities of the two round bamboo tubes, and the interior of the plastic cup sleeve defines an inner cavity; A PVC liner tube, wherein an internal cavity is defined inside the PVC liner tube, and the PVC liner tube is arranged inside the plastic cup sleeve to define an internal cavity; a metal connector, wherein the metal connector may be a screw or a bolt, and is cross-arranged to pass through the PVC liner tube, the plastic cup sleeve and the round bamboo tube.

2. The round bamboo structure joint of the plastic cup sleeve and the PVC liner according to claim 1 is characterized in that: The larger dimension of the outer diameter of the two round bamboo tubes at the joint of the round bamboo stalks is D, the smaller dimension of the inner diameter is D1, and the smaller dimension of the length of the internal cavity is L. The plastic cup sleeve is similar to the structure of a drinking cup, with one end closed (closed end) and the other end open (open end). The outer diameter of the open end is D1, and the inner diameter is 4mm smaller than D1 (i.e. D1-4mm); the outer diameter of the closed end is D1-1mm, and the bottom of the closed end inside the cup sleeve forms a circular cross-section with a diameter of D1-5mm. The plastic cup sleeve is arranged in the internal cavity of the two round bamboo tubes, and the length of the plastic cup sleeve is l, not exceeding L. The open end is flush with the end surface of the bamboo tube and is not exposed, and the closed end is inserted into the internal cavity of the bamboo tube. The outer diameter of the PVC inner tube is not greater than D1-5mm, and is arranged inside the two plastic cup sleeves. The length of the PVC inner tube is 2l, which is just evenly separated by the two plastic cup sleeves.

3. The round bamboo structure joint of the plastic cup sleeve and the PVC liner according to claim 1 is characterized in that: The inner and outer surfaces of the plastic cup sleeve are uniformly coated with resin as a structural adhesive. Specifically, the resin includes at least one of epoxy resin, polyurethane resin and bio-based resin.

4. The round bamboo structure joint of the plastic cup sleeve and the PVC liner according to claim 1 is characterized in that: The outer diameters of the two round bamboo tubes at the joint of the round bamboo stalks are the larger one D, the diameter of the metal connecting piece is d and the length is greater than D, and the metal connecting piece is cross-arranged between the two round bamboo tubes in a symmetrical manner.

5. The round bamboo structure joint of the plastic cup sleeve and the PVC liner according to claim 4 is characterized in that: The metal connectors are bolts, which are no less than 6d away from the ends of the bamboo tubes, are arranged in a cross-shaped symmetrical pattern, and the distance between adjacent metal connectors is no less than 5d.

6. The round bamboo structure joint of the plastic cup sleeve and the PVC liner according to claim 4, characterized in that: The metal connectors are screws, which are no less than 8d away from the ends of the bamboo tubes. The number of screws is 2n, which are staggered along the two circular bamboo walls and evenly and symmetrically arranged around the circumference every 360 / n° in the circular direction of the bamboo wall. The distance between adjacent metal connectors is no less than 4d.

7. A method for manufacturing a round bamboo structure joint using a plastic cup sleeve and a PVC liner, characterized in that: The circular bamboo structure splicing node using a plastic cup sleeve and a PVC liner is a circular bamboo structure splicing node using a plastic cup sleeve and a PVC liner according to any one of claims 1 to 6, and the manufacturing method comprises the following steps: S10, the two circular bamboo stalks are placed horizontally in a relative manner, so that the internal cavities defined by the two circular bamboo tubes at the splicing of the circular bamboo stalks are relative and aligned for splicing; S20, resin glue is evenly applied on the outer surface of the plastic cup sleeve, and its closed end is first inserted into the internal cavity of the bamboo tube, and pushed along the insertion direction. When the open end of the plastic cup sleeve is flush with the end face of the bamboo tube, the insertion is stopped, and the open end is not exposed at this time. Wait for the colloid to solidify and form an overall coated reinforcement area; S30, glue is evenly applied to the inside of the two plastic cup sleeves, and the PVC liner tube is inserted into the internal cavity of the first plastic cup sleeve until the PVC liner tube touches the bottom surface of the cup sleeve. After that, the PVC liner tube is further inserted into the second plastic cup sleeve. When the two round bamboo tubes are almost seamlessly attached, the installation is completed; S40, the punching positions are marked on the two round bamboo tubes. According to the marked punching positions, one of the round bamboo tubes is punched in sequence. When punching, the round bamboo tube, the plastic cup sleeve, and the internal PVC liner tube are passed through. After passing through the round bamboo tube, it is fixed according to the type of the metal connector; S41, the metal connector is a bolt. After punching, the bolt is placed in the hole, and the spring washers are placed in sequence and fixed with nuts. After each installation of the metal connector is completed, the next hole is punched and installed until all the metal connectors of the bamboo tube are installed; S42, the metal connector is a screw. After punching, the screw is directly screwed in and fixed. After each installation of the metal connector is completed, the next hole is punched and installed until all the metal connectors of the bamboo tube are installed.

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