Winding corrugated pipe of reinforcing rib composite cantilever type pipe body and manufacturing method

Abstract

The invention provides a winding corrugated pipe of a reinforcing rib composite cantilever type pipe body and a manufacturing method. The winding corrugated pipe comprises a pipe body formed by winding a strip, the outer side of the pipe body is provided with a reinforcing rib formed by a protruding part of the strip, a groove is formed in the outer side of the reinforcing rib, and the pipe body is wound on the groove; with the section of the pipe body as the view angle direction, the outer side points, connected with the pipe body, of the protruding reinforcing ribs on the two sides of the pipe body form cantilever ends, the length L of the cantilever ends is larger than the horizontal distance A from the outer side points, connected with the pipe body, of the reinforcing ribs to the center of the pipe body, and the outer diameter R of the pipe body is larger than the height H of the protruding parts. The method of manufacture includes extruding and winding a strip, and then extruding and winding a tube body onto the strip. The process is simple, the ring stiffness is higher, and the overall structure is more stable.

Description

Technical Field

[0001] This invention relates to the field of corrugated pipes, specifically to a spiral corrugated pipe with a reinforced composite cantilever body and a manufacturing method thereof. Background Technology

[0002] Polyethylene (PE) spiral corrugated pipes have become widely used in municipal drainage, agricultural irrigation, and industrial pipe networks due to their advantages such as corrosion resistance, light weight, long service life, and high overall economic benefits. The mainstream manufacturing process involves spirally winding pre-formed profiles to form a tubular body, and then adding reinforcing structures to the outer wall of this tubular body to provide the required ring stiffness and resistance to external pressure. However, most existing reinforcing rib designs are relatively simple, often consisting of a single hollow cavity or solid rib with limited moment of inertia. To achieve higher ring stiffness requirements, this is often only achieved by simply increasing the height or thickness of the ribs. This not only significantly increases raw material consumption, leading to higher costs, but also significantly increases the weight of the pipe, causing inconvenience for transportation and construction.

[0003] Of course, there are now methods that use reinforcing ribs and spiral winding to improve the overall ring stiffness of the corrugated pipe. For example, patent application number 201821412073.1, with an authorization announcement date of April 30, 2019, discloses a hollow-wall spiral steel corrugated reinforced pipe. This pipe is formed by spirally winding and fusing plastic profiled strips to form the pipe body. The plastic profiled strips have supports on both sides. The outer surfaces of the two supports of adjacent spirally wound plastic profiled strips are fused together. A reinforcing pipe is wound at the fusion point. The reinforcing pipe consists of two layers: an inner metal flexible tube and an outer polyethylene tube. The polyethylene tube is fused to the surface of the support. Using a metal flexible tube as the corrugation, which is currently 2 / 3 cheaper than polyethylene raw materials, significantly reduces the raw material formulation cost of the pipe and represents a future trend for corrugated reinforced pipes. The use of hollow supports to support the metal flexible tube ensures reliable fixation, greatly improving the ring stiffness of the product. However, in this type of corrugated pipe structure, as disclosed in the accompanying drawings of the specification, the semicircle of the reinforcing pipe on the side closest to the support is supported by the support; that is, the support uses a 180° wrap-around support for the reinforcing pipe, and the outer sides of the reinforcing pipe are basically flush with the outer sides of the support. Under load, deformation will be concentrated in the free arc segment at the top of the reinforcing pipe, with the lower semicircular material contributing almost nothing to bending resistance. Although the initial deformation Δy (Δy is the change in the vertical inner diameter of the reinforcing pipe under load) may be small, this support will cause a significant concentration of interfacial shear stress, which can easily lead to the failure of the fusion interface between the reinforcing pipe and the support. Once the fusion interface fails, the overall stiffness of the structure will drop rapidly, resulting in the actual ring stiffness of the wound corrugated pipe being lower than the test value.

[0004] Patent document 202011521513.9 discloses a plastic spiral wound high-rib structural wall pipe and its manufacturing method. The spiral wound pipe is formed by spirally winding a base strip and reinforcing rib strips after extrusion, cooling, and shaping, and then bonding them with melt adhesive. The base strip forms the pipe body with bottom ribs; the reinforcing rib strips are spirally wound and bonded to the bottom ribs, forming reinforcing ribs wound around the pipe body. Because the thickness of the cooled strip limits its minimum bending radius, the structural wall height of traditional plastic spiral wound structural wall pipes manufactured by lateral fusion bonding of a single strip is limited. This invention overcomes these limitations, significantly increasing the ratio of reinforcing rib height to pipe diameter. Compared to traditional plastic spiral wound structural wall pipes, the weight per meter of pipe with the same stiffness is significantly reduced. Furthermore, the ingenious manufacturing method in pipe forming... The structural design allows for the formation of multiple supporting ribs within the reinforcing ribs, significantly enhancing their structural strength. The plastic spiral wound wall tube manufactured using this invention has a scientifically sound structure, is easy to produce, offers excellent cost-effectiveness, and possesses enormous market potential. However, as can be seen from the accompanying drawings, the reinforcing rib strip is located within the range of the bottom rib, thus it also suffers from low ring stiffness. Summary of the Invention

[0005] This invention provides a spiral corrugated pipe with a reinforced composite cantilever tube body and a manufacturing method thereof. The preparation method of this invention is simple, and its ring stiffness is higher and the overall structure is more stable.

[0006] To achieve the above objectives, the technical solution of the present invention is: a spiral corrugated pipe with a reinforced composite cantilever tube body, comprising a tube body formed by winding strip material, the outer side of the tube body having a reinforcing rib formed by a protrusion of the strip material, a groove provided on the outer side of the reinforcing rib, and the tube body wound on the groove; with the cross-section of the tube body as the viewing direction, the outer points where the reinforcing ribs connect with the tube body on both sides of the tube body form cantilever ends; wherein the length L of the cantilever end is greater than the horizontal distance A from the outer point where the reinforcing ribs connect with the tube body to the center of the tube body, and the outer diameter R of the tube body is greater than the height H of the protrusion.

[0007] The manufacturing method for the spiral corrugated pipe with the above-mentioned reinforced composite cantilever pipe body is as follows: S1. The strip is extruded through the first extruder and wound onto the roller of the corrugated tube forming machine. At the same time, adhesive is extruded to connect adjacent strips to form an adhesive layer.

[0008] S2. The tube body is extruded through an extruder and wound onto the groove. The tube body is then connected to the reinforcing ribs using adhesive.

[0009] S3. A spiral corrugated pipe with a reinforced composite cantilever tube body formed by cooling.

[0010] In the aforementioned structure, the cantilever ends formed by the outer points where the protruding reinforcing ribs on both sides of the tube connect to the tube body create a minor arc support. This cantilever end on both sides of the tube cross-section allows the entire tube to gradually transform from a circle to an ellipse under load. The tube material, including the cantilever ends, can generate continuous deformation and strain, thus effectively maximizing the bending stiffness per unit length. Furthermore, this structure has a small support area and high contact pressure, but the relative deformation tendency between the tube body and the reinforcing ribs is small. The flexibility of the cantilever ends absorbs some deformation, alleviating interfacial shear stress and reducing the likelihood of delamination at the connection between the tube body and the reinforcing ribs. Simultaneously, this structure results in uniform tube deformation and smooth stress distribution, reducing the likelihood of local buckling. Therefore, when using this structure, the minor arc support and the hollow cross-section of the tube allow for continuous deformation and strain within the tube itself, reducing radial deformation forces on the tube body and improving the overall ring stiffness of the wound corrugated pipe.

[0011] Furthermore, since the length L of the cantilever end is greater than the horizontal distance A from the outer point where the reinforcing rib connects to the tube body to the center of the tube body, the cantilever end provides space for the deformation of the entire tube body. Moreover, in this invention, the tube body is made of plastic material, which has good elastic deformation performance. Therefore, the cantilever end provides a larger elastic deformation space, which better buffers the impact force from the load on the wound corrugated pipe, resulting in higher ring stiffness and a more stable overall structure. Because the outer diameter R of the tube body is greater than the height H of the protrusion, the tube body can provide a larger deformation space, reducing the force on the reinforcing rib and thus improving the strength of the tube body.

[0012] The above manufacturing method is simple and ensures the ring stiffness of the wound corrugated pipe.

[0013] Furthermore, the protrusion is a hollow protrusion. This structure provides space for radial deformation, thus buffering the deformation and reducing the impact and force of the load on the inner wall of the wound bellows.

[0014] Furthermore, the strip cross-section includes a sheet and strip with protrusions at both ends, and an adhesive layer connects adjacent protrusions, with grooves formed on the outer sides of adjacent protrusions. This structure, with the adhesive layer formed between adjacent protrusions, provides a larger bonding surface for the adhesive layer due to the outward protrusion of the protrusions, thus improving the strength of the pipe body.

[0015] Furthermore, the cross-section of the strip has one or more first hollow cavities. This structure allows for an increase in the thickness of the strip, while reducing material usage through the first hollow cavities. This controls costs on the one hand, and increases the ring stiffness of the pipe body on the other.

[0016] Furthermore, the strip cross-section includes reinforcing ribs formed by mutually symmetrical protrusions and connecting strips disposed on both sides of the reinforcing ribs, with overlapping portions provided at the free ends of the connecting strips. This structure, which makes the reinforcing ribs form a whole, can improve the strength of the wound corrugated pipe.

[0017] Furthermore, the cross-section of the connecting strip has one or more second hollow cavities. This structure allows for an increase in the thickness of the connecting strip, while reducing material usage through the second hollow cavities. This controls costs on the one hand, and increases the ring stiffness of the pipe body on the other.

[0018] Furthermore, after the adjacent overlapping parts overlap, a third hollow cavity is formed between the adjacent overlapping parts.

[0019] Furthermore, the pipe body is a single-walled corrugated pipe. The high ring stiffness of the single-walled corrugated pipe can improve the overall ring stiffness of the wound corrugated pipe.

[0020] Furthermore, the single-walled corrugated pipe is covered with a covering pipe on the outside. By adding the covering pipe, the ring stiffness of the wound corrugated pipe can be further improved. Attached Figure Description

[0021] Figure 1 This is a perspective view of Example 1 of the present invention.

[0022] Figure 2 This is a cross-sectional view of the strip in Example 1 of the present invention.

[0023] Figure 3 This is a schematic diagram of the axial portion of the spiral corrugated pipe of the reinforced composite cantilever pipe body in Embodiment 1 of the present invention.

[0024] Figure 4 This is a cross-sectional view of the single-arm corrugated pipe and the covered pipe of the present invention.

[0025] Figure 5 This is a cross-sectional view of the strip in Embodiment 2 of the present invention.

[0026] Figure 6 This is a schematic diagram of the strip connection in Embodiment 2 of the present invention.

[0027] Figure 7 This is a flowchart illustrating the manufacturing method of the present invention. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0029] Example 1.

[0030] like Figures 1 to 3As shown, the reinforced composite cantilever corrugated pipe includes a pipe body 1 formed by winding strip 2, and the outer side of the pipe body 1 has reinforcing ribs 20 formed by protrusions 21 of the strip. In this embodiment, as shown... Figure 2 As shown, the cross-section of the strip 2 includes a sheet 22 and protrusions 21 disposed at both ends of the sheet 22; the cross-section of the sheet 22 has one or more first hollow cavities 221, which can increase the thickness h of the sheet 22, save material costs, and ultimately improve the strength of the wound corrugated pipe; the cross-section of the protrusion 21 includes a bottom surface 211, a first side surface 212, a second side surface 213, and a top surface 214. The bottom surface 211 extends horizontally and is connected to the sheet 22, the lower end of the first side surface 212 is connected to the bottom surface 211, and the first side surface 212 extends vertically upward. The lower end of the second side surface 213 is connected to the bottom surface 211. The second side surface 213 extends upward and obliquely away from the strip. The top surface 214 extends upward and obliquely from the upper end of the first side surface to the upper end of the second side surface. This facilitates the formation of a groove 200 between adjacent protrusions. The oblique extension of the second side surface will form horizontal and vertical components of force on the second side surface. The formation of these components reduces the vertical component of force, thereby reducing the radial force on the pipe body. An adhesive layer 3 connects the adjacent protrusions to connect the wound strip to form the pipe body. The bottom surface 211, the first side surface 212, the second side surface 213, and the top surface 214 form a hollow cavity 215, making the protrusion 21 a hollow protrusion. This structure provides space for radial deformation and can buffer deformation, thereby reducing the impact and force of the load on the inner wall of the wound corrugated pipe.

[0031] In this invention, the length L of the cantilever end is greater than the horizontal distance A from the outer point where the reinforcing rib connects to the pipe body to the center of the pipe body, and the outer diameter R of the pipe body is greater than the height H of the protrusion. Because the length L of the cantilever end is greater than the horizontal distance A from the outer point where the reinforcing rib connects to the pipe body to the center of the pipe body, the cantilever end provides space for the deformation of the entire pipe body. Furthermore, since the pipe body in this invention is made of plastic material, which has good elastic deformation performance, the cantilever end provides a larger elastic deformation space. This better buffers the impact force from the load on the wound corrugated pipe, resulting in higher ring stiffness and a more stable overall structure. Because the outer diameter R of the pipe body is greater than the height H of the protrusion, the pipe body provides a larger deformation space, reducing the force on the reinforcing rib and thus improving the strength of the pipe body.

[0032] like Figure 1 and Figure 3 As shown, a tube 4 is wound around the groove 200. The tube 4 is connected to the reinforcing ribs through an adhesive layer. Taking the cross-section of the tube as the viewing direction, i.e. Figure 3 From the perspective shown, the outer points 6 where the protruding reinforcing ribs on both sides of the tube connect with the tube body form cantilever ends 41.

[0033] In this embodiment, the pipe body 4 can be a single-wall corrugated pipe or, for example, a... Figure 4 The pipe body 4 shown is composed of a single-walled corrugated pipe 42 and a covering pipe 43 disposed outside the single-walled corrugated pipe, or the cross-section of the pipe body is formed by connecting two or more pipes sequentially from the inside and outside. Its overall purpose is to provide the pipe body with resistance to deformation. The cross-section of the pipe body can be circular, polygonal, or irregular. In this example, the cross-section of the pipe body is described as circular.

[0034] The manufacturing method for the spiral corrugated pipe with the above-mentioned reinforced composite cantilever pipe body is as follows: S1. The strip is extruded through the first extruder and wound onto the roller of the corrugated tube forming machine. At the same time, adhesive is extruded to connect adjacent strips to form an adhesive layer.

[0035] S2. The tube body is extruded through an extruder and wound onto the groove. The tube body is then connected to the reinforcing ribs using adhesive.

[0036] S3. A spiral corrugated pipe with a reinforced composite cantilever tube body formed by cooling.

[0037] In this embodiment, because the outer points where the protruding reinforcing ribs on both sides of the pipe connect to the pipe body form cantilever ends, the support of the reinforcing ribs on the pipe body is a minor arc support. Thus, the cantilever ends formed on both sides of the pipe body cross-section allow the entire pipe body to gradually change from a circle to an ellipse under load. The pipe material, including the cantilever ends, can generate continuous deformation strain, thereby effectively maximizing the bending stiffness per unit length. Furthermore, this structure has a small support area and high contact pressure, but the relative deformation trend between the pipe body and the reinforcing ribs is small. Because the flexibility of the cantilever ends can absorb some deformation, the interface shear stress is alleviated, making it less likely to cause delamination at the connection between the pipe body and the reinforcing ribs. Simultaneously, this structure results in uniform pipe deformation and smooth stress distribution, making it less prone to local buckling. Therefore, when the above structure is adopted, due to the use of minor arc support and the hollow cross-section of the pipe body, continuous deformation strain can be generated within the pipe body itself, thereby reducing the radial deformation force on the pipe body and improving the overall ring stiffness of the wound corrugated pipe.

[0038] Example 2.

[0039] The difference between Example 2 and Example 1 is the shape of the strip; everything else is the same. Figure 5 and Figure 6As shown, the cross-section of the strip 2 includes reinforcing ribs 20 formed by mutually symmetrical protrusions 21 and connecting strips 23 disposed on both sides of the reinforcing ribs. A groove 200 that can match the shape of the tube is formed on the outer side of the reinforcing ribs 20. The tube and the reinforcing ribs are connected by an adhesive layer. An overlap portion 24 is provided at the free end of the connecting strip 23. The cross-section of the connecting strip 23 has one or more second hollow cavities 231. After the adjacent overlap portions 24 overlap, a third hollow cavity 241 is formed between the adjacent overlap portions. In order to improve the connection strength of the strip, adhesive can be filled in the third hollow cavity.

Claims

1. A winding bellows of a reinforced composite cantilever pipe body, comprising a pipe body wound by a strip, the outer side of the pipe body having a reinforcing rib formed by a protruding part of the strip, the outer side of the reinforcing rib being provided with a groove, a pipe body being wound on the groove, the cross section of the pipe body being circular; characterized in that: The two protruding reinforcing ribs of the pipe body are connected to the outer side points of the pipe body, and the outer side points form cantilever ends in the cross-sectional view of the pipe body, wherein the length L of the cantilever end is greater than the horizontal distance A from the outer side points to the center of the pipe body, the outer diameter R of the pipe body is greater than the height H of the protruding part.

2. A reinforced composite cantilevered pipe body wound bellows according to claim 1, characterized in that: The protruding part is a hollow protruding part.

3. A reinforced composite cantilevered pipe body wound bellows according to claim 1 or 2, characterised in that: The cross section of the strip includes a plate strip and protruding parts arranged at both ends of the plate strip, and an adhesive layer is arranged between adjacent protruding parts, and grooves are formed on the outer sides of adjacent protruding parts.

4. A reinforced composite cantilevered pipe body wound bellows according to claim 3, characterized in that: The cross section of the plate strip has more than one first hollow cavity.

5. A reinforced composite cantilevered pipe body wound bellows according to claim 1 or 2, characterized in that: The cross section of the strip includes reinforcing ribs formed by mutually symmetrical protruding parts and connecting plate strips arranged on both sides of the reinforcing ribs, and overlapping parts are arranged at the free ends of the connecting plate strips.

6. A reinforced composite cantilevered pipe body wound bellows according to claim 5, characterized in that: The cross section of the connecting plate strip has more than one second hollow cavity.

7. A reinforced composite cantilevered pipe body wound bellows according to claim 5, characterized in that: After the adjacent overlapping parts are overlapped, a third hollow cavity is formed between the adjacent overlapping parts.

8. A reinforced composite cantilevered pipe body wound bellows according to claim 1, characterized in that: The pipe body is a single-wall corrugated pipe.

9. A reinforced composite cantilevered pipe body wound bellows according to claim 8, characterized in that: The single-wall corrugated pipe is wrapped with a wrapping pipe.

10. A method of manufacturing a reinforced composite cantilevered pipe body's wound bellows pipe for manufacturing the reinforced composite cantilevered pipe body's wound bellows pipe according to claim 1, characterized in that The method comprises the following steps: S1, extruding the strip through a first extruder and winding it on a drum of a corrugated pipe forming machine, and extruding adhesive through an adhesive layer to connect adjacent strips to form an adhesive layer; S2, extruding the pipe body through an extruder and winding it on the groove, and connecting the pipe body and the reinforcing rib through the adhesive; S3, cooling the wound corrugated pipe to form a reinforcing rib composite cantilever pipe body.

Images