High-rib spiral corrugated pipe

Abstract

The invention relates to a high-rib spiral corrugated pipe which comprises a pipe bottom belt and a plastic profile, the plastic profile is spirally wound on the outer side of the pipe bottom belt to form an outer corrugated shape, the plastic profile comprises a hollow body and a vertical rib, the body is defined by a bottom edge and two side edges, the vertical rib is located in the body, and the vertical rib is located in the body. A cavity in the body is divided into two parts, and the tops of the two side edges of the body are connected with the side walls of the vertical ribs. According to the corrugated pipe, materials needed during pipe manufacturing can be reduced, the weight per meter of the whole corrugated pipe is reduced, the extrusion production speed can be greatly increased, the ring stiffness of the corrugated pipe can be guaranteed, the tensile strength of the corrugated pipe is improved, and the whole corrugated pipe is not prone to breakage.

Description

Technical Field

[0001] The invention relates to a plastic reinforced spiral corrugated pipe, which is an underground pipe material and is widely used in laying various drainage pipes. Background Art

[0002] In recent years, with the huge demand for municipal pipelines, many plastic pipes have emerged, such as PVC pipes, straight-through water pipes, steel belt reinforced winding structure wall pipes, spiral corrugated pipes with hollow ribs, etc.

[0003] Chinese patent number ZL 201610584263.0, entitled "A Plastic Reinforced Wrapped Corrugated Pipe," discloses a plastic reinforced wrapped corrugated pipe comprising a pipe base band and a plastic profile. The plastic profile is spirally wound around the outside of the pipe base band to form an outer corrugated shape. The plastic profile comprises a hollow body and vertical ribs. The body is an isosceles triangle or an isosceles trapezoid. The vertical ribs are located in the body and divide the cavity inside the body into two. The top of the body is arc-shaped. A longitudinal through hole is provided in the vertical ribs.

[0004] The aforementioned reinforced plastic corrugated pipe, an early product of our company, was discovered to have the following drawbacks after development and use: the main body of the plastic profile completely encloses the vertical ribs. During use, the forces acting on the bellows primarily act on the tops of the ribs, meaning the ribs provide the primary ring stiffness. Consequently, the larger cross-section of the main body of the plastic profile inevitably increases the material required for pipe production, increasing the overall weight of the bellows per meter.

[0005] Chinese Patent No. ZL 201010218818.2, entitled "Inner Rib Reinforced External Corrugated Plastic Wrapped Structural Wall Tube and Its Manufacturing Method," discloses an inner rib reinforced external corrugated plastic wrapped structural wall tube comprising a cylindrical tubular body and reinforcing ribs spirally wrapped around the outside of the tubular body. The reinforcing ribs contain a reinforcing inner rib perpendicular to the tubular wall, which divides the rib into two parallel hollow cavities. The reinforcing inner rib is formed by fusing the two sides of the adjacent tubular protrusion hollow cavities of adjacent profiled strips with molten adhesive. A solid protrusion can be formed above the reinforcing rib, or at the top of the inner rib.

[0006] The above-mentioned inner rib reinforced outer corrugated plastic wrapped structure wall pipe has the following defects:

[0007] 1. The welding surface is the entire circumferential section, which reduces the ring stiffness of the structural wall pipe. If the process is not properly controlled, it is easy to cause the pipe to have insufficient tensile strength, break easily, and the corrugation to be spring-shaped.

[0008] 2. The reinforced inner ribs are formed by fusion of molten glue, which results in the width of the reinforced inner ribs not being uniform, that is, the ring stiffness of the entire structural wall pipe cannot be guaranteed, and the meter weight of the pipe increases.

[0009] 3. Although it discloses that the top of the reinforced inner rib can have a solid protrusion, this solid protrusion is formed by sol. The reinforced inner rib formed by the sol must be subjected to a large external extrusion pressure to form a dense structure inside and provide support. The method of using a pressure wheel to crush the inner rib disclosed in this patent is not only difficult to ensure a consistent amount of sol squeezed in, but also difficult to control the extrusion pressure. Therefore, it is difficult to ensure that the technical indicators required for the reinforced inner rib are met, and the entire pipe cannot achieve the required ring stiffness. Summary of the Invention

[0010] In order to solve the above problems, the purpose of the present invention is to provide a high-rib spiral corrugated pipe that can ensure ring stiffness, reduce the required materials, lower the meter weight, increase tensile strength, and is not easy to break.

[0011] To achieve the above-mentioned object, the present invention adopts the following technical solution: a high-rib spiral corrugated pipe, comprising a pipe base strip and a plastic profile, wherein the plastic profile is spirally wound around the outside of the pipe base strip to form an outer corrugated shape, characterized in that: the plastic profile consists of a body formed by a bottom edge and two side edges and vertical ribs, wherein the vertical ribs are located in the body for no less than 75% of the total height of the vertical ribs, wherein the vertical ribs are formed first, and the width of the vertical ribs is determined according to the required ring stiffness of the corrugated pipe, wherein the tops of the two side edges of the body are connected to the side walls of the vertical ribs of different widths formed first, and the height from the connection point between the tops of the two side edges of the body and the side walls of the vertical ribs to the bottom of the vertical ribs is no less than 75% of the total height of the vertical ribs, wherein the tops of the two side edges of the body and the side walls of the vertical ribs are connected by co-extrusion composite molding, and the co-extrusion composite point is provided with a groove structure; the bottom edge of the body and the bottom of the vertical ribs are co-extruded composite, and the co-extrusion composite point is located between one-half of the bottom edge of the body and the bottom of the vertical ribs.

[0012] Preferably, longitudinal through holes are provided in the vertical ribs.

[0013] Preferably, the longitudinal through hole is located in the vertical rib inside the body.

[0014] Preferably, after the plastic profile is manufactured, a long strip of base tape is wound and welded to form the bottom tape of the tube, and at the same time, the middle part of the bottom of the plastic profile and the connection point of the base tape are thermally fused, wound and composited.

[0015] Preferably, a socket and a spigot are welded at both ends of the bottom band of the pipe respectively.

[0016] Preferably, the cross section of the vertical rib is a long strip, trapezoidal or special-shaped structure that is wide at the bottom and narrow at the top.

[0017] Preferably, both side edges of the body are arc-shaped edges, straight edges or bent structures.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The vertical ribs are formed first, so that the height and width of the vertical ribs can be determined according to the required ring stiffness of the corrugated pipe. The reinforced inner ribs formed by the sol intersect, and the technical indicators such as the size and internal structure of the vertical ribs are better controlled, thereby ensuring the ring stiffness of the corrugated pipe. The vertical ribs and the body are co-extruded and compositely formed, which is not only conducive to heat dissipation, but also greatly improves the extrusion production speed.

[0020] 2. The main body of the plastic profile no longer follows the height of the vertical reinforcement but completely covers the vertical reinforcement inside. The two sides of the main body play a role in oblique support for the vertical reinforcement and are used to withstand the smaller lateral pressure from the soil layer. Therefore, the overall cross-section of the main body of the plastic profile is smaller, and the material required for pipe making is relatively reduced, which reduces the weight per meter of the entire corrugated pipe.

[0021] 3. The vertical ribs are provided with longitudinal through holes, and the longitudinal through holes are located in the vertical ribs inside the body, which not only ensures the ring stiffness, but also reduces the meter weight of the corrugated pipe and can increase the line speed during production.

[0022] 4. There is no circumferential welding surface, which improves the tensile strength of the bellows and makes the entire bellows less likely to break. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 It is a structural schematic diagram of the present invention.

[0025] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure of part A in the middle.

[0026] Figure 3 yes Figure 2 Schematic diagram of the structure when both sides of the middle body are arc-shaped edges.

[0027] Figure 4 yes Figure 2 Structural diagram when the neutral reinforcement is a trapezoid that is wide at the bottom and narrow at the top.

[0028] In the figure: 1. bottom band of the tube, 2. body, 21. bottom edge, 22. side edge, 3. vertical rib, 4. co-extrusion compounding point, 5. through hole, a. height from the connection point between the top of the two sides of the body and the side wall of the vertical rib to the bottom of the vertical rib. DETAILED DESCRIPTION

[0029] The serial numbers of the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationship 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 limiting the present invention.

[0030] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] like Figure 1 、 Figure 2 As shown, a high-rib spiral corrugated pipe includes a pipe bottom band 1 and a plastic profile. The plastic profile is spirally wound on the outside of the pipe bottom band 1 to form an outer corrugated shape. The plastic profile includes a hollow body 2 and vertical ribs 3. The cross section of the vertical rib 3 is a long strip. Figure 4As shown, the cross section of the vertical rib 3 can also be a trapezoid with a wide bottom and a narrow top. The vertical rib 3 with a trapezoidal structure with a wide bottom and a narrow top has a higher supporting force. The shape of the vertical rib 3 can also be other special-shaped structures, all of which fall within the scope of protection of the present invention. The body 2 is surrounded by a bottom edge 21 and two side edges 22. The two side edges 22 of the body 2 are arc-shaped edges, such as Figure 3 As shown, the two side edges 22 of the body 2 can also be straight edges, or can be bent, etc., all of which fall within the scope of protection of the present invention. The vertical rib 3 is located in the body 2 and divides the cavity inside the body 2 into two. The tops of the two side edges 22 of the body 2 are connected to the side walls of the vertical rib 3.

[0033] As a preferred embodiment, the body 2 and the ribs 3 are co-extruded. During the co-extrusion process, the bottom edge 21 of the body 2 and the bottom of the ribs 3 form a co-extrusion point 4, and the tops of the two side edges 22 of the body 2 and the side walls of the ribs 3 form a co-extrusion point 4. To increase the firmness during the co-extrusion process, a commonly used groove structure can be provided.

[0034] As a preferred embodiment, longitudinal through-holes 5 are provided in the vertical ribs 3. As a preferred embodiment, these longitudinal through-holes 5 are located within the vertical ribs 3 within the body 2. This not only ensures the supporting force of the vertical ribs 3, but also reduces the weight per meter of the corrugated pipe and increases the production line speed. The hole shape, number, and arrangement of the through-holes 5 are not specifically limited in this embodiment and are all within the scope of protection of the present invention.

[0035] As a preferred solution, the height a between the connection point between the top of the two side edges 22 of the main body 2 and the side wall of the vertical rib 3 and the bottom of the vertical rib 3 is not less than 75% of the height of the entire vertical rib 3. This ensures that the two side edges 22 of the main body 2 can provide sufficient support for the vertical rib 3 and prevents the vertical rib 3 located outside the main body 2 from collapsing under strong force.

[0036] The preparation method of the high-rib spiral corrugated pipe is as follows: during production, the vertical ribs 3 are first formed, so that the width of the vertical ribs 3 can be determined according to the required ring stiffness of the corrugated pipe, thereby ensuring the ring stiffness of the corrugated pipe. The vertical ribs 3 and the main body 2 are co-extruded and composited to form a plastic profile. When the main body 2 and the vertical ribs 3 are co-extruded and composited, the co-extrusion composite point 4 is formed between the bottom edge 21 of the main body 2 and the bottom of the vertical ribs 3, and the co-extrusion composite point 4 is formed between the top of the two side edges 22 of the main body 2 and the side wall of the vertical ribs 3. This is not only conducive to heat dissipation, but also can greatly improve the extrusion production speed. After the plastic profile is manufactured, a long strip of base strip is wound and welded to form a pipe bottom strip 1, and at the same time, the middle part of the bottom of the plastic profile is thermally fused and wrapped with the connection point of the base strip. The plastic profile forms an outer corrugated shape on the outside of the pipe bottom strip 1, and a socket and a spigot are welded at both ends of the pipe bottom strip 1 to form a corrugated pipe.

[0037] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0038] It should be noted that the components mentioned in the above embodiments are all universal standard parts or components known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.

[0039] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A high-rib spiral corrugated pipe, comprising a pipe base band and a plastic profile, wherein the plastic profile is spirally wound around the outer side of the pipe base band to form an outer corrugated shape, characterized in that: The plastic profile consists of a main body and vertical ribs formed by a bottom edge and two side edges, and the vertical ribs are located in the main body for no less than 75% of the entire vertical rib height, wherein the vertical ribs are formed first, and the width of the vertical ribs is determined according to the ring stiffness required by the corrugated tube, the tops of the two side edges of the main body are connected to the side walls of the vertical ribs of different widths formed first, and the height between the connection point between the tops of the two side edges of the main body and the side walls of the vertical ribs and the bottom of the vertical ribs is no less than 75% of the entire vertical rib height, the tops of the two side edges of the main body and the side walls of the vertical ribs are connected to each other by co-extrusion composite molding, and a groove structure is provided at the co-extrusion composite point; the bottom edge of the main body and the bottom of the vertical rib are co-extruded composite, and the co-extrusion composite point is between half of the bottom edge of the main body and the bottom of the vertical rib.

2. The high-rib spiral corrugated pipe according to claim 1, characterized in that: A longitudinal through hole is provided in the vertical rib.

3. The high-rib spiral corrugated pipe according to claim 2, characterized in that: The longitudinal through hole is located in the vertical rib inside the body.

4. The high-rib spiral corrugated pipe according to claim 1, characterized in that: After the plastic profile is manufactured, the long strip base tape is wound and welded to form the tube bottom tape, and at the same time, the middle part of the bottom of the plastic profile and the connection point of the base tape are thermally fused, wound and composited.

5. The high-rib spiral corrugated pipe according to claim 1, characterized in that: The two ends of the bottom band of the pipe are respectively welded with a socket and a spigot.

6. The high-rib spiral corrugated pipe according to claim 1, characterized in that: The cross section of the vertical rib is a long strip, trapezoidal or special-shaped structure that is wide at the bottom and narrow at the top.

7. The high-rib spiral corrugated pipe according to claim 1, characterized in that: The two side edges of the body are arc-shaped edges, straight edges or bent structures.

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