Prestressed concrete cylinder pipe and connecting structure thereof

Abstract

The utility model relates to the field of pipelines, in particular to a prestressed concrete cylinder pipe and a connecting structure thereof, the prestressed concrete cylinder pipe comprises a pipe body, and a prestressed steel wire in the pipe body is configured to be coated with plastic in a straightened and prestressed state; the pipe body comprises a plastic protection layer, the material of the plastic protection layer is the same as that of the plastic wrapping the prestressed steel wire, and the plastic protection layer wraps the prestressed steel wire. The steel wire is subjected to plastic coating under the state of obtaining prestress after being straightened, namely, the steel wire is subjected to plastic coating anti-corrosion after being fully deformed, so that the steel wire is not easy to corrode; the prestressed steel wire serves as a pipe body prestress source and also serves as a rib for forming the plastic protection layer, the plastic protection layer and concrete or the steel cylinder are tightly connected into a whole, good pipe body protection is provided, steel wire corrosion prestress failure and even steel wire breakage are prevented, the occurrence probability of pipe explosion accidents is reduced, and the service life is prolonged. The prestressed steel cylinder concrete pipe is simple in structure, convenient to use and good in effect.

Description

Technical Field

[0001] This utility model relates to the field of pipeline technology, and in particular to a prestressed steel cylinder concrete pipe and its connection structure. Background Technology

[0002] Prestressed concrete cylinder pipe (PCCP) is a water pipe made by winding circumferential prestressed steel wires around a high-strength concrete core with a steel cylinder, and then spraying a dense cement mortar protective layer on top. It is a composite pipe composed of thin steel plates, high-strength steel wires, and concrete, fully and comprehensively utilizing the tensile strength and sealing properties of steel and the compressive strength and corrosion resistance of concrete, resulting in high sealing performance, high strength, and high impermeability.

[0003] PCCP is a widely used type of pipeline, known for its large diameter, high pressure resistance, and low cost. Existing buried PCCPs consist of an inner concrete layer, a thin steel cylinder, an outer concrete layer, wound prestressed steel wires, and a mortar protective layer arranged from the inside out. Existing lined PCCPs consist of a concrete layer, a thin steel cylinder, wound prestressed steel wires, and a mortar protective layer arranged from the inside out. The mortar protective layer is used to protect the prestressed steel wires from corrosion, but the anti-corrosion protection effect of the mortar protective layer is generally not very good.

[0004] In some existing steel wire anti-corrosion technologies, if the steel wire is pre-treated for corrosion protection before prestressing and drawing, the anti-corrosion layer is likely to be damaged. This is because the anti-corrosion treatment (coating or plating) is performed while the steel wire is straightened, and then it is coiled after treatment. During prestressing and drawing, it is straightened again and its diameter is reduced (to obtain prestress). In this deformation, as well as the friction of the prestressing equipment, the anti-corrosion layer will be affected, its adhesion will be reduced, and it may even be damaged (fall off), thus affecting its anti-corrosion effect.

[0005] As described above, in the existing technology, accidents such as pipe bursts caused by corrosion of prestressed steel wires occur frequently, which means that PCCP pipe products need further iteration and upgrading in order to avoid being eliminated by the industry. Utility Model Content

[0006] The purpose of this utility model is to address the problem in existing PCCPs where the prestressed steel wires are first treated with anti-corrosion before prestressing. During the prestressing process, the diameter of the steel wires shrinks, and the anti-corrosion layer is affected by friction from the prestressing equipment, which reduces adhesion and may even cause damage (falling off). This makes the prestressed steel wires susceptible to corrosion, leading to frequent pipe bursts. The present invention provides a prestressed steel cylinder concrete pipe and its connection structure.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] In a first aspect, this utility model provides a prestressed steel cylinder concrete pipe, including a pipe body, wherein the prestressed steel wire in the pipe body is configured to be covered with plastic in a straightened and prestressed state;

[0009] The tube body includes a plastic protective layer, the material of which is the same as the material of the plastic covering the prestressed steel wire, and the plastic protective layer wraps around the prestressed steel wire.

[0010] The prestressed steel cylinder concrete pipe of this invention uses a prestressed steel wire that is plastic-coated after being straightened to obtain prestress. This plastic coating, applied after the steel wire has fully deformed, provides corrosion protection and transforms the prestressed steel wire into a corrosion-resistant material. The plastic coating layer on the surface of the steel wire provides sufficient strength to prevent cracking after deformation, simplifying the process and making the steel wire less susceptible to corrosion. Furthermore, a plastic protective layer of the same material as the plastic coating layer is used to wrap the prestressed steel wire, forming an outer protective layer. This plastic protective layer and the plastic coating layer are easily heat-fused together, facilitating the pipe's forming process. The prestressed steel wire serves both as the source of prestress for the pipe and as the reinforcing material for the plastic protective layer, tightly connecting the plastic protective layer to the concrete or steel cylinder. This provides excellent pipe protection, preventing corrosion, prestress failure, and even wire breakage, reducing the probability of pipe bursts and extending service life. This prestressed steel cylinder concrete pipe has a simple structure, is easy to use, and delivers excellent results.

[0011] As a preferred technical solution of this utility model, the plastic protective layer is a PVC (polyvinyl chloride) layer, a PE (polyethylene) layer, a PP (polypropylene) layer, a PS (polystyrene) layer, a PET (polyethylene terephthalate) layer, a PU (polyurethane) layer, a PC (polycarbonate) layer, a PA (nylon) layer, or an ABS (acrylonitrile-butadiene-styrene copolymer) layer.

[0012] As a preferred technical solution of this utility model, the pipe body includes a concrete layer, a steel cylinder and a plastic protective layer arranged sequentially from the inside to the outside. The prestressed steel wire is wound around the outer wall of the steel cylinder and embedded in the plastic protective layer, that is, the pipe body is an inner-lined PCCP pipe body.

[0013] As a preferred technical solution of this utility model, the pipe body includes an inner concrete layer, a steel cylinder, an outer concrete layer and a plastic protective layer arranged sequentially from the inside to the outside. The prestressed steel wire is wound around the outer wall of the outer concrete layer and embedded in the plastic protective layer, that is, the pipe body is an embedded PCCP pipe body.

[0014] Secondly, this utility model also provides a connection structure for a prestressed steel cylinder concrete pipe, including a joint, which is sleeved on the end of the prestressed steel cylinder concrete pipe as described in any of the above claims.

[0015] As a preferred technical solution of this utility model, the connector is provided with an opening groove, and a sealing ring is provided in the opening groove. The inner ring wall of the sealing ring abuts against the outer wall of the pipe body, the outer ring wall and one side wall of the sealing ring abut against the connector, and the other side wall of the sealing ring abuts against a pressure ring. The pressure ring and the connector can move relative to each other along the axial direction of the pipe body.

[0016] With this structural design, by adjusting the relative position between the pressure ring and the connector, the pressure ring can apply pressure to the sealing ring, forcing the sealing ring to deform and further tighten against the outer wall of the pipe, thus forming a sealed connection.

[0017] As a further preferred technical solution of this utility model, a retaining ring is detachably connected to one side of the connector where the pressure ring is located. A first bolt is threaded onto the retaining ring, and the end of the first bolt passes through the retaining ring and abuts against the pressure ring.

[0018] As a further preferred technical solution of this utility model, the retaining ring and the connector are connected by a second bolt.

[0019] As a preferred technical solution of this utility model, the connector is a flat connector, which connects two pipes of equal diameter, and the cross-section of the flat connector is T-shaped.

[0020] As a preferred technical solution of this utility model, the connector is a reducing connector, which connects two pipes of different diameters, and the cross-section of the reducing connector is Z-shaped.

[0021] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0022] 1. The prestressed steel cylinder concrete pipe of this utility model involves plastic coating on the steel wire after it has been straightened and prestressed. This coating, applied after the wire has fully deformed, provides corrosion protection and transforms the prestressed steel wire into a corrosion-resistant material. The plastic coating layer on the wire surface provides sufficient strength to prevent cracking after deformation, simplifying the process and reducing corrosion. Furthermore, a plastic protective layer of the same material as the plastic coating layer is used to wrap the prestressed steel wire, forming an outer protective layer. This layer is easily heat-fused to the plastic coating layer, facilitating the pipe's forming process. The prestressed steel wire serves as both the source of prestress and the reinforcement for the plastic protective layer, tightly connecting it to the concrete or steel cylinder. This provides excellent pipe protection, preventing corrosion, prestress failure, and even wire breakage, reducing the probability of pipe bursts and extending service life. This prestressed steel cylinder concrete pipe has a simple structure, is easy to use, and performs well.

[0023] 2. A preferred connection structure for a prestressed steel cylinder concrete pipe of this utility model involves adjusting the relative position between the pressure ring and the joint so that the pressure ring can apply pressure to the sealing ring, forcing the sealing ring to deform and further tighten against the outer wall of the pipe body, thus forming a sealed connection. Attached Figure Description

[0024] Figure 1 This is a half-section schematic diagram of a prestressed steel cylinder concrete pipe.

[0025] Figure 2 for Figure 1 Enlarged view of section A;

[0026] Figure 3 A half-sectional schematic diagram of a connection of equal-diameter pipes;

[0027] Figure 4 for Figure 3 Enlarged view of section B;

[0028] Figure 5 A half-sectional view of the reducer connection;

[0029] Figure 6 for Figure 5 Enlarged view of section C.

[0030] The markings in the diagram are: 1-pipe body, 11-concrete layer, 12-steel cylinder, 13-prestressed steel wire, 14-plastic protective layer, 2-flat joint, 3-sealing ring, 4-retaining ring, 5-second bolt, 6-first bolt, 7-pressure ring, 8-foam gasket, 9-reducing joint. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to experimental examples and specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments. All technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0032] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0033] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0034] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0035] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0036] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0037] In related technologies, the anti-corrosion protection effect of mortar protective layers is generally poor. Furthermore, in some existing steel wire anti-corrosion technologies, if the steel wire is pre-treated with anti-corrosion before prestressing, damage to the anti-corrosion layer is highly likely. This is because the anti-corrosion treatment (coating or plating) is performed while the steel wire is straightened, and then it is coiled after treatment. During prestressing, it is straightened again, and its diameter is reduced (to obtain prestress). In this deformation process, as well as the friction from the prestressing equipment, the anti-corrosion layer is affected, its adhesion is reduced, and it may even be damaged (fall off), thus affecting its anti-corrosion effect. This makes the prestressed steel wire susceptible to corrosion, leading to frequent pipe bursts. Therefore, the technical solution of this application was developed. The following is a detailed explanation... Figures 1 to 6 To elaborate.

[0038] Example 1

[0039] like Figure 1 and Figure 2 As shown, the prestressed steel cylinder concrete pipe of this utility model includes a pipe body 1, which includes a concrete layer 11, a steel cylinder 12, and a plastic protective layer 14 arranged sequentially from the inside to the outside, i.e., the pipe body 1 is an internally lined PCCP pipe body; the outer wall of the steel cylinder 12 is wound with prestressed steel wires 13, and the prestressed steel wires 13 are embedded in the plastic protective layer 14; the prestressed steel wires 13 are configured to be covered with plastic when straightened and prestressed; the material of the plastic covering the prestressed steel wires 13 is the same as the material of the plastic protective layer 14.

[0040] In an optional embodiment, the plastic protective layer 14 is a PVC (polyvinyl chloride) layer, a PE (polyethylene) layer, a PP (polypropylene) layer, a PS (polystyrene) layer, a PET (polyethylene terephthalate) layer, a PU (polyurethane) layer, a PC (polycarbonate) layer, a PA (nylon) layer, or an ABS (acrylonitrile-butadiene-styrene copolymer) layer.

[0041] In an optional embodiment, after the prestressed steel wire 13 is wound around the outer wall of the steel cylinder 12, the tube blank of the tube body 1 is placed into a forming mold, and molten plastic is injected. The molten plastic penetrates into the gaps between the prestressed steel wires 13 and adheres to the outer wall of the steel cylinder 12, flattening the molten plastic to form the plastic protective layer 14. When the molten plastic penetrates into the gaps between the prestressed steel wires 13, the molten plastic and the plastic coating layer of the outer wall of the prestressed steel wire 13 are thermally fused together, thus combining the prestressed steel wire 13 and the plastic protective layer 14 into one unit. The prestressed steel wire 13 serves as the skeleton of the plastic protective layer 14, such as... Figure 2 As shown.

[0042] This embodiment describes a prestressed steel cylinder concrete pipe. The steel wire is plastic-coated after being straightened to obtain prestress, meaning the steel wire is fully deformed before being coated for corrosion protection. This design transforms the prestressed steel wire into a corrosion-resistant wire. The plastic coating on the wire surface provides sufficient strength to prevent cracking after deformation, simplifying the process and reducing corrosion. A plastic protective layer 14, made of the same material as the plastic coating, wraps around the prestressed steel wire 13, further forming an outer protective layer. This layer is easily heat-fused to the plastic coating, facilitating the pipe body 1's molding process. The prestressed steel wire 13 serves both as the source of prestress for the pipe body 1 and as the reinforcing element for the plastic protective layer 14, tightly connecting it to the concrete or steel cylinder. This provides excellent pipe protection, preventing corrosion, prestress failure, and even wire breakage, reducing the probability of pipe bursts and extending service life. This prestressed steel cylinder concrete pipe has a simple structure, is easy to use, and performs well.

[0043] Example 2

[0044] Unless otherwise illustrated, the prestressed steel cylinder concrete pipe of this utility model differs from that of Embodiment 1 in that, in this embodiment, the pipe body 1 is an embedded PCCP pipe body, and the pipe body 1 includes an inner concrete layer, a steel cylinder 12, an outer concrete layer and a plastic protective layer 14 arranged sequentially from the inside to the outside. The prestressed steel wire 13 is wound around the outer wall of the outer concrete layer and embedded in the plastic protective layer 14.

[0045] Example 3

[0046] like Figure 3 and Figure 4 As shown, the connection structure of the prestressed steel cylinder concrete pipe of this utility model includes a joint, which is sleeved on the end of the prestressed steel cylinder concrete pipe as described in Embodiment 1 or Embodiment 2.

[0047] In an optional embodiment, the connector is provided with an opening groove, and a sealing ring 3 is provided in the opening groove. The inner ring wall of the sealing ring 3 abuts against the outer wall of the pipe body 1, and the outer ring wall and one side wall of the sealing ring 3 abut against the connector. The other side wall of the sealing ring 3 abuts against a pressure ring 7. The pressure ring 7 and the connector can move relative to each other along the axial direction of the pipe body 1.

[0048] like Figure 4 As shown, the connector has a retaining ring 4 detachably connected to one side of the pressure ring 7, specifically by a second bolt 5. A first bolt 6 is threaded onto the retaining ring 4, and the end of the first bolt 6 passes through the retaining ring 4 and abuts against the pressure ring 7.

[0049] In one alternative implementation, such as Figure 4 As shown, the connector is a flat connector 2, which connects two pipe bodies 1 of equal diameter. The cross-section of the flat connector 2 is T-shaped, that is, each side of the flat connector 2 has an opening groove, and the opening groove is located close to the side of the pipe body 1. One opening groove corresponds to one pipe body 1, that is, two sealing rings 3 are respectively pressed onto one pipe body 1 to achieve a sealed connection, forming a sealed connection between two pipe bodies 1 of equal diameter.

[0050] In one alternative implementation, such as Figure 4 As shown, a foam gasket 8 is abutting between the two tubes 1 of equal diameter.

[0051] The connection structure of the prestressed steel cylinder concrete pipe described in this embodiment involves adjusting the relative position between the pressure ring 7 and the joint so that the pressure ring 7 can apply pressure to the sealing ring 3, forcing the sealing ring 3 to deform and further tighten against the outer wall of the pipe body 1 to form a sealed connection.

[0052] Example 4

[0053] like Figure 5 and Figure 6 As shown, the connection structure of the prestressed steel cylinder concrete pipe of this utility model differs from that of Embodiment 3 in that, in this embodiment, the joint is a reducing joint 9.

[0054] The reducing connector 9 connects two pipe bodies 1 with different diameters, and the cross-section of the reducing connector 9 is Z-shaped.

[0055] like Figure 5As shown, the Z-shaped reducing connector 9 has an upper horizontal section, a lower horizontal section, and an intermediate connecting section. The inner diameter of the upper horizontal section is adapted to the outer diameter of one of the pipe bodies 1, and the inner diameter of the lower horizontal section is adapted to the outer diameter of another pipe body 1. The intermediate connecting section can be inclined relative to the upper horizontal section or vertically relative to the upper horizontal section. The intermediate connecting section can be straight or curved.

[0056] Example 5

[0057] Not shown, the prestressed steel cylinder concrete pipe of this utility model, based on Embodiment 1 or Embodiment 2, has one end of the pipe body 1 flared to form a socket. The inner diameter of the socket is adapted to the outer diameter of the pipe body 1. The sealing design of the socket adopts the sealing design of the connection structure of the prestressed steel cylinder concrete pipe as described in Embodiment 3 or Embodiment 4 (see reference). Figure 6 ).

[0058] In this way, the prestressed steel cylinder concrete pipe products with a single diameter can be directly connected in series and sealed for installation.

[0059] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A prestressed steel cylinder concrete pipe, comprising a pipe body (1), characterized in that, The prestressed steel wire (13) in the tube (1) is configured to be covered with plastic when straightened and prestressed; The tube body (1) includes a plastic protective layer (14), the material of which is the same as that of the plastic covering the prestressed steel wire (13), and the plastic protective layer (14) wraps the prestressed steel wire (13).

2. The prestressed steel cylinder concrete pipe according to claim 1, characterized in that, The plastic protective layer (14) is a PVC layer, PE layer, PP layer, PS layer, PET layer, PU layer, PC layer, PA layer or ABS layer.

3. The prestressed steel cylinder concrete pipe according to claim 1, characterized in that, The pipe body (1) includes a concrete layer (11), a steel cylinder (12) and a plastic protective layer (14) arranged sequentially from the inside to the outside. The prestressed steel wire (13) is wound around the outer wall of the steel cylinder (12) and embedded in the plastic protective layer (14).

4. The prestressed steel cylinder concrete pipe according to claim 1, characterized in that, The pipe body (1) includes an inner concrete layer, a steel cylinder (12), an outer concrete layer and a plastic protective layer (14) arranged sequentially from the inside to the outside. The prestressed steel wire (13) is wound around the outer wall of the outer concrete layer and embedded in the plastic protective layer (14).

5. A connection structure for a prestressed steel cylinder concrete pipe, characterized in that, Includes a joint, which is sleeved on the end of the prestressed steel cylinder concrete pipe as described in any one of claims 1-4.

6. The connection structure of the prestressed steel cylinder concrete pipe according to claim 5, characterized in that, The connector is provided with an opening groove, and a sealing ring (3) is provided in the opening groove. The inner ring wall of the sealing ring (3) abuts against the outer wall of the pipe body (1), and the outer ring wall and one side wall of the sealing ring (3) abut against the connector. The other side wall of the sealing ring (3) abuts against a pressure ring (7). The pressure ring (7) and the connector can move relative to each other along the axial direction of the pipe body (1).

7. The connection structure of the prestressed steel cylinder concrete pipe according to claim 6, characterized in that, The connector has a retaining ring (4) detachably connected to one side of the pressure ring (7). A first bolt (6) is threaded onto the retaining ring (4). The end of the first bolt (6) passes through the retaining ring (4) and abuts against the pressure ring (7).

8. The connection structure of the prestressed steel cylinder concrete pipe according to claim 7, characterized in that, The retaining ring (4) and the connector are connected by a second bolt (5).

9. The connection structure of the prestressed steel cylinder concrete pipe according to any one of claims 5-8, characterized in that, The connector is a flat connector (2), which connects two pipes (1) of equal diameter. The cross-section of the flat connector (2) is T-shaped.

10. The connection structure of the prestressed steel cylinder concrete pipe according to any one of claims 5-8, characterized in that, The connector is a reducing connector (9), which connects two pipe bodies (1) of unequal diameters. The cross-section of the reducing connector (9) is Z-shaped.

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