Bionic knotty joint structure of bamboo-wound pressure pipeline

Abstract

The utility model relates to bamboo winding composite material pipeline technical field discloses a kind of bionic bamboo joint structure of bamboo winding pressure pipeline, the bionic bamboo joint is set to the connecting part of two sections axial alignment bamboo winding pipeline, from inside to outside sequentially include: mutually welded connection's inner lining, the reinforcing layer of planting bar consisting of reinforcing material and planting bar glue, the film constraint layer consisting of fiber reinforced cloth and impregnated resin, the tight layer of bundle knot consisting of metal fastener crossing two tubes, the pouring protective layer of polymer modified cement mortar, the pouring protective layer covers entire interface.The utility model is through the composite structure of cross truss type planting bar, polymer modified mortar pouring and bundle knot fastening, so that interface obtains high connection strength, excellent pullout resistance and long-term durability.

Description

Technical Field

[0001] This utility model relates to the field of bamboo-wound composite material pipe technology, specifically a biomimetic bamboo joint interface structure for a bamboo-wound pressure pipe. Background Technology

[0002] Bamboo-wound pipes, a novel bio-based composite material pipe made from natural bamboo as the matrix and resin as the adhesive through a winding process, have shown broad application prospects in water conservancy transportation, municipal engineering, and farmland irrigation due to their advantages such as being environmentally friendly, having high specific strength, and being corrosion-resistant. However, as a linear engineering material, the connection technology of the pipe is a key link and technical bottleneck that determines whether the entire pipeline network system can operate safely, stably, and sustainably.

[0003] Currently, the industry has explored and applied various technical solutions for connecting bamboo-wound pipes. Common methods include socket-type flexible connections borrowed from traditional plastic pipes, where a groove is provided at one end of the pipe to accommodate a rubber sealing ring, and the other end serves as a plug, with the seal achieved through the elastic compression of the rubber ring. Another method uses flange connections, where metal flanges are fixed to the ends of the two pipe sections, and the connection is achieved by tightening bolts and using sealing gaskets. In some cases, hot-melt butt welding of the inner lining layer is used to enhance the watertightness of the joint, or external metal clamps are used for simple reinforcement.

[0004] While existing technologies have solved the connection problem of bamboo-wound pipes to some extent, they still have some shortcomings when dealing with complex engineering environments and long-term service requirements:

[0005] Existing connection methods often couple the two core functions of "sealing" and "bearing load" onto a single and fragile mechanism, lacking a systematic structural design. For example, socket connections mainly rely on the compression and rebound of rubber rings to achieve sealing. However, as a flexible non-structural material, the rubber ring's essential function is waterproofing rather than load-bearing. Therefore, it cannot provide effective axial pull-out resistance. When faced with axial forces generated by water hammer, temperature changes, or uneven foundation settlement in the pipeline, the joint is highly susceptible to being pulled out.

[0006] Furthermore, existing connection methods generally lack long-term, three-dimensional protection for the interface area, resulting in insufficient durability. Both rubber sealing rings and flange gaskets have inherent material aging issues; when buried underground for extended periods, they lose elasticity due to environmental erosion, leading to seal failure. More critically, these connection methods expose the end face of the pipe structure layer (i.e., the cut surface of the bamboo) directly or indirectly to the external environment. Moisture can penetrate through these weak points, causing the bamboo to swell and rot, ultimately leading to the collapse of the entire interface's structural strength from the inside out. Utility Model Content

[0007] To address the shortcomings of existing technologies, this utility model provides a biomimetic bamboo joint interface structure for bamboo-wound pressure pipes, which solves the problems of low connection strength, poor pull-out resistance, and insufficient long-term sealing reliability and durability caused by the simple structure and defects in the load-bearing and sealing mechanisms of existing bamboo-wound pipe interfaces.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A biomimetic bamboo joint interface structure for a bamboo-wound pressure pipe, wherein the interface is a connection part set at two axially aligned bamboo-wound pipe sections, and the connection part includes, from the inside to the outside: an inner lining welding layer formed by welding the inner lining layers of the two bamboo-wound pipe sections together; a rebar reinforcement layer composed of reinforcing material embedded in the structural layers of the two bamboo-wound pipe sections and cured rebar adhesive; a film restraint layer composed of fiber reinforcement cloth wrapped around the outside of the interface and impregnated and cured resin; a joint fastening layer composed of multiple metal fasteners bridging the two bamboo-wound pipe sections; and a casting protective layer formed by casting and curing polymer-modified cement mortar covering the rebar reinforcement layer, film restraint layer and joint fastening layer.

[0010] Moreover, the reinforcing material in the rebar reinforcement layer is placed between the structural layers of the two sections of the bamboo-wound pipe, forming a cross-truss locking structure.

[0011] Furthermore, the metal fasteners in the fastening layer have surfaces that are threaded, grooved, or knurled.

[0012] Furthermore, the reinforcing material in the rebar reinforcement layer is carbon fiber rebar or glass fiber rebar; and the rebar adhesive is modified epoxy resin rebar adhesive.

[0013] Moreover, the fiber-reinforcing fabric in the coating constraint layer (4) is glass fiber cloth or carbon fiber cloth; the resin is epoxy resin.

[0014] This utility model has the following beneficial effects:

[0015] 1. The composite structure of this utility model enhances the structural strength and pull-out resistance of bamboo-wound pipe joints. By setting a reinforcing layer that penetrates deep into the pipe wall and ingeniously forming a cross-truss-like locking structure, the axial tensile force borne by the joint is efficiently converted into compressive and shear stresses on the pipe wall, achieving a "deep-rooted" firm anchorage. Combined with the physical locking of the external fastening layer, a three-dimensional load-bearing system combining chemical bonding and mechanical interlocking is constructed, fundamentally solving the technical problem of insufficient connection strength and easy failure under tensile force in traditional joints.

[0016] 2. The internal lining welding layer of this utility model ensures absolute sealing of the medium transportation, thereby ensuring the integrity and protection function of the entire interface structure during long-term service.

[0017] 3. This utility model has a film-coated constraint layer on the surface to maximize the circumferential clamping effect; at the same time, the selected modified epoxy resin anchoring adhesive has both high strength and high toughness and anti-sagging performance that meets the requirements of on-site construction; ensuring that each joint can meet the expected performance standards. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the interface cross-section of this utility model;

[0019] Figure 2 This is a schematic diagram of the structural assembly of this utility model.

[0020] The components include: 1. Bamboo-wound pipe; 2. Inner lining welded layer; 3. Reinforcing bar layer; 4. Film-coated restraint layer; 5. Joint fastening layer; and 6. Cast-in-place protective layer. Detailed Implementation

[0021] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] Please see the appendix Figure 1 -Appendix Figure 2 :

[0023] A biomimetic bamboo joint interface structure for a bamboo-wound pressure pipe is disclosed. The interface is located at the connection point of two axially aligned bamboo-wound pipe sections 1. The structure, from the inside out, consists of: an inner lining welding layer 2 formed by hot-melt welding of high-density polyethylene inner linings of the two pipe sections; a rebar reinforcement layer 3 composed of carbon fiber reinforcing bars embedded in the structural layers of the two pipe sections and cured modified epoxy resin anchoring adhesive, wherein the carbon fiber reinforcing bars form a cross-truss-type locking structure between the two pipe sections; a film restraint layer 4 composed of 12 layers of carbon fiber cloth wrapped around the outside of the interface and impregnated and cured epoxy resin; a joint fastening layer 5 composed of multiple threaded U-shaped steel fasteners bridging the two pipe sections; and a casting protective layer 6 formed by casting and curing polymer-modified cement mortar that covers and encapsulates other reinforcing structures. The weight parts of the mortar are: 100 parts silicate cement, 200 parts quartz sand, 1.0 part chopped polypropylene fiber, and 20 parts styrene-acrylic emulsion.

[0024] Example 2:

[0025] A biomimetic bamboo joint interface structure for a bamboo-wound pressure pipe is disclosed. The interface is located at the connection point of two axially aligned bamboo-wound pipe sections 1. The structure, from the inside out, consists of: an inner lining welding layer 2 formed by connecting the 304 stainless steel inner linings of the two pipe sections using tungsten inert gas welding; a reinforcement layer 3 composed of glass fiber reinforcements embedded in the structural layers of the two pipe sections and cured modified epoxy resin anchoring adhesive, wherein the glass fiber reinforcements form a cross-truss-like locking structure between the two pipe sections; a film restraint layer 4 composed of five layers of glass fiber cloth wrapped around the outside of the interface and impregnated and cured epoxy resin; a joint fastening layer 5 composed of multiple irregularly shaped steel fasteners with grooved surfaces that span the two pipe sections; and a casting protective layer 6 formed by casting and covering other reinforcing structures with polymer-modified cement mortar that has been cured. The weight parts of the mortar are: 90 parts silicate cement, 150 parts quartz sand, 0.5 parts chopped polypropylene fibers, and 15 parts styrene-acrylic emulsion.

[0026] Example 3:

[0027] A biomimetic bamboo joint interface structure for a bamboo-wound pressure pipe is disclosed. The interface is located at the connection point of two axially aligned bamboo-wound pipe sections 1. The structure, from the inside out, consists of: an inner lining welding layer 2 formed by hot-melt welding of high-density polyethylene (HDPE) inner linings of the two pipe sections; a rebar reinforcement layer 3 composed of carbon fiber reinforcing bars embedded in the structural layers of the two pipe sections and cured modified epoxy resin anchoring adhesive, wherein the carbon fiber reinforcing bars form a cross-truss-like locking structure between the two pipe sections; a film restraint layer 4 composed of 20 layers of carbon fiber cloth wrapped around the outside of the interface and impregnated and cured epoxy resin; a joint fastening layer 5 composed of multiple U-shaped steel fasteners with knurled surfaces that span the two pipe sections; and a casting protective layer 6 formed by casting and curing polymer-modified cement mortar that covers other reinforcing structures. The weight parts of the mortar are: 110 parts silicate cement, 250 parts quartz sand, 1.5 parts chopped polypropylene fibers, and 25 parts styrene-acrylic emulsion.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A biomimetic bamboo joint interface structure for a bamboo-wound pressure pipe, characterized in that, The interface is a connection part set at two axially aligned bamboo winding pipes (1). The connection part includes, from the inside to the outside: an inner lining welding layer (2) formed by welding the inner lining layers of the two bamboo winding pipes (1); a rebar reinforcement layer (3) composed of reinforcing material and cured rebar adhesive embedded in the structural layers of the two bamboo winding pipes (1); a film restraint layer (4) composed of fiber reinforcement cloth wrapped around the outside of the interface and resin impregnated and cured; a joint fastening layer (5) composed of multiple metal fasteners bridging the two bamboo winding pipes (1); and a cast protective layer (6) formed by casting and covering the rebar reinforcement layer (3), the film restraint layer (4) and the joint fastening layer (5) and curing the polymer modified cement mortar.

2. The biomimetic bamboo joint interface structure of the bamboo-wound pressure pipe according to claim 1, characterized in that, The reinforcing material in the rebar reinforcement layer (3) is placed between the structural layers of the two sections of the bamboo-wound pipe (1) to form a cross-truss locking structure.

3. The biomimetic bamboo joint interface structure of the bamboo-wound pressure pipe according to claim 1, characterized in that, The metal fasteners in the fastening layer (5) have surfaces that are threaded, grooved, or knurled.

4. The biomimetic bamboo joint interface structure of the bamboo-wound pressure pipe according to claim 1, characterized in that, The reinforcing material in the rebar reinforcement layer (3) is carbon fiber rebar or glass fiber rebar; the rebar adhesive is modified epoxy resin rebar adhesive.

5. The biomimetic bamboo joint interface structure of the bamboo-wound pressure pipe according to claim 1, characterized in that, The fiber-reinforcing fabric in the coating constraint layer (4) is glass fiber cloth or carbon fiber cloth; the resin is epoxy resin.

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