Prestress protection structure and PCCP (prestressed concrete cylinder pipe) with same
By adopting a prestressed protective structure on the prestressed steel cylinder concrete pipe, including the prestressed steel wire anti-corrosion layer, the cement mortar protective layer and the external corrosion layer of the pipe, the problem of poor protection effect of the pipe body in areas with severe corrosion is solved, and the corrosion resistance and durability of the pipe body are significantly improved.
Patent Information
- Application Number
- CN202323526449.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-22
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2033-12-22
AI Technical Summary
In areas with severe corrosion, the poor effect of the external protection system of the prestressed steel cylinder concrete pipes leads to corrosion of the mortar protective layer, poor durability, and broken wires, causing pipe bursting.
Prestressed protective structure is adopted, including prestressed steel wire anti-corrosion layer, cement mortar protective layer and external anti-corrosion layer of the pipe. Each layer cooperates with each other to form a tight protective structure to prevent corrosion of the prestressed steel wire and mortar protective layer.
It effectively improves the corrosion resistance and durability of prestressed steel cylinder concrete pipes, avoids the phenomenon of pipe bursting, and significantly improves the protective effect of the pipe body.
Smart Images
Figure CN222963492U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of concrete pipe protection, in particular to a prestressed protection structure and a PCCP pipe with a prestressed protection structure. Background Technique
[0002] Since the prestressed concrete cylinder pipe was introduced into China in 1989, after more than 30 years of exploration, learning and development, China has basically established a complete set of systems for pipeline design, production and installation. The prestressed concrete cylinder pipe is a product with high comprehensive cost performance. Especially for large-diameter (≥DN2000mm) water transmission pipelines, its competitive advantage is very obvious.
[0003] In recent years, with the rapid development and application of prestressed concrete cylinder pipes, more and more problems have emerged in the application process, such as the corrosion of the mortar protective layer, poor durability, and the problem of pipe bursting caused by corrosion and broken wires, which have also attracted more and more attention in the industry and seriously affected its development in China. At present, anti-corrosion construction on the outside of the pipe can play a certain protective role, but in areas with severe corrosion, its protection system is still not ideal. In addition, using a concrete protective layer instead of mortar can achieve better results, but it will increase the weight of the pipe body, improve the construction difficulty, and significantly increase the cost.
[0004] In view of this, the present utility model is specifically proposed. Content of the Utility Model
[0005] One of the purposes of the present utility model is to provide a prestressed protection structure for a PCCP pipe, so as to solve the technical problems existing in the prior art that in areas with severe corrosion, the external protection system of the prestressed concrete cylinder pipe has poor effect, resulting in the corrosion of the mortar protective layer, poor durability, and pipe bursting caused by broken wires.
[0006] Another purpose of the present utility model is to provide a PCCP pipe, so as to solve the technical problem in the prior art that there is a lack of a PCCP pipe with a protection system for the prestressed steel wire of the pipe body.
[0007] In order to achieve the above purposes of the present utility model, the following technical solutions are specifically adopted:
[0008] In the first aspect, the present utility model provides a prestressed protection structure for a PCCP pipe, including: a prestressed steel wire anti-corrosion layer, a cement mortar protective layer and an external pipe anti-corrosion layer arranged in sequence, and the prestressed steel wire anti-corrosion layer is used to prevent the prestressed steel wire from corroding.
[0009] Furthermore, the thickness of the prestressed steel wire anti-corrosion layer is 60μm - 120μm.
[0010] Furthermore, the thickness of the prestressed steel wire anti-corrosion layer is 80μm - 100μm.
[0011] Furthermore, the thickness of the cement mortar protective layer ≥ 25 mm.
[0012] Furthermore, the thickness of the external anti-corrosion layer of the pipe is 0.6 mm to 2.4 mm.
[0013] Furthermore, it further includes a neat cement layer, which is arranged between the anti-corrosion layer of the prestressed steel wire and the cement mortar protective layer.
[0014] Furthermore, the coating amount of the neat cement layer is 0.4 L / m 2 ~0.5 L / m 2 .
[0015] Furthermore, the anti-corrosion layer of the prestressed steel wire wraps around the outer periphery of the prestressed steel wire.
[0016] Furthermore, the anti-corrosion layer of the prestressed steel wire covers the surface of the prestressed steel wire that is not in contact with the PCCP pipe, and covers the PCCP pipe between adjacent prestressed steel wires.
[0017] In a second aspect, the present utility model provides a PCCP pipe, which includes a core concrete layer, a steel cylinder arranged inside the core concrete layer, prestressed steel wires wound around the outer periphery of the core concrete layer, and the above-mentioned prestressed protection structure arranged on the prestressed steel wires;
[0018] It further includes a pipe socket and a pipe socket arranged at both ends of the PCCP pipe, and the pipe socket and the pipe socket are connected in a matching manner.
[0019] For the PCCP pipe with a prestressed protection structure provided by the present utility model, the anti-corrosion layer of the prestressed steel wire protects the prestressed steel wire, the cement mortar protective layer covers the outside of the anti-corrosion layer of the prestressed steel wire to protect the anti-corrosion layer of the prestressed steel wire. The external anti-corrosion layer of the pipe is arranged on the outermost layer to protect the cement mortar protective layer. The anti-corrosion layer of the prestressed steel wire, the cement mortar protective layer and the external anti-corrosion layer of the pipe cooperate with each other to form a prestressed protection structure, which can be closely attached to the PCCP pipe, so that there is no gap between the prestressed protection structure and the PCCP pipe. It solves the technical problems existing in the prior art that in areas with serious corrosion, the external protection system of the prestressed steel cylinder concrete pipe has poor effect, resulting in the corrosion of the mortar protective layer, poor durability, and burst pipes caused by broken wires. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0021] Figure 1 Cross-sectional structure schematic diagram of a PCCP pipe with a prestressed protection structure provided in Embodiment 1 of the present utility model;
[0022] Figure 2 is Figure 1 the enlarged structure schematic diagram at A in
[0023] Figure 3 Connection state structure schematic diagram of a PCCP pipe with a prestressed protection structure provided in Embodiment 1 of the present utility model;
[0024] Figure 4 is Figure 3 the enlarged structure schematic diagram at B in
[0025] Figure 5 Connection state structure schematic diagram of a PCCP pipe with a prestressed protection structure provided in Embodiment 2 of the present utility model;
[0026] Figure 6 is Figure 5 the enlarged structure schematic diagram at C in
[0027] Icon: 10 - Steel wire anticorrosion layer; 11 - Cement mortar protection layer; 12 - Outer anticorrosion layer of the pipe body;
[0028] 20 - Core concrete layer; 21 - Steel cylinder; 22 - Prestressed steel wire;
[0029] 30 - Pipe socket;
[0030] 40 - Pipe spigot. Detailed implementation manners
[0031] Unless otherwise defined herein, scientific and technical terms used in conjunction with the present utility model shall have the meanings commonly understood by those of ordinary skill in the art. The meanings and scopes of the terms should be clear. However, in any case of potential ambiguity, the definitions provided herein shall prevail over any dictionary or extrinsic definition. In this application, unless otherwise specified, the use of "or" means "and / or". In addition, the use of the term "comprising" and other forms is non-restrictive.
[0032] In general, the nomenclature and techniques used in connection with cell and tissue culture, molecular biology, immunology, microbiology, genetics, and protein and nucleic acid chemistry and hybridization described herein are those well known and commonly used in the art. Unless otherwise indicated, the methods and techniques of the present utility model are generally carried out according to conventional methods well known in the art and as described in various general and more specific references, which are cited and discussed throughout this specification. Enzymatic reactions and purification techniques are carried out according to the manufacturer's instructions, as commonly practiced in the art or as described herein. The nomenclature, as well as the laboratory procedures and techniques used in connection with analytical chemistry, synthetic organic chemistry, and medical and pharmaceutical chemistry described herein are those well known and commonly used in the art.
[0033] On the one hand, the present utility model provides a prestressed protection structure for a PCCP pipe, comprising: a prestressed steel wire anti-corrosion layer 10, a cement mortar protection layer 11, and an outer pipe anti-corrosion layer 12 arranged in sequence, wherein the prestressed steel wire anti-corrosion layer 10 is used to prevent the prestressed steel wire 22 from being corroded.
[0034] The prestressed steel wire anti-corrosion layer 10 protects the prestressed steel wire 22. The prestressed steel wire anti-corrosion layer 10 comprises epoxy resin, polyurethane, high-density polyethylene, and a metal anti-corrosion nano-permeation material. In specific use, the prestressed steel wire anti-corrosion layer 10 is a coating layer, so that the prestressed steel wire anti-corrosion layer 10 fits closely with the prestressed steel wire 22 to avoid falling off. The cement mortar protection layer 11 covers the outside of the prestressed steel wire anti-corrosion layer 10 to protect the prestressed steel wire anti-corrosion layer 10. The outer pipe anti-corrosion layer 12 is arranged on the outermost layer to protect the cement mortar protection layer 11.
[0035] The prestressed steel wire anti-corrosion layer 10, the cement mortar protection layer 11, and the outer pipe anti-corrosion layer 12 cooperate with each other to form a prestressed protection structure, which can closely fit on the PCCP pipe, so that there is no gap between the prestressed protection structure and the PCCP pipe. It solves the technical problems existing in the prior art that in areas with serious corrosion, the effect of the outer pipe protection system of the prestressed concrete cylinder pipe is poor, resulting in the corrosion of the mortar protection layer, poor durability, and burst pipes caused by broken wires.
[0036] During the implementation process, in order to make the prestressed protection structure in a state with a protective effect, it is necessary to limit the specific thickness of the prestressed steel wire anti-corrosion layer 10, the cement mortar protection layer 11, and the outer pipe anti-corrosion layer 12.
[0037] In some specific embodiments, the thickness of the prestressed steel wire anti-corrosion layer 10 is 60 μm to 120 μm.
[0038] Among them, the thickness of the anti-corrosion layer 10 of the prestressed steel wire can be, but is not limited to, 60μm, 70μm, 80μm, 90μm, 100μm, 110μm or 120μm, and can also be any value between 60μm and 120μm.
[0039] In some specific embodiments, the thickness of the anti-corrosion layer 10 of the prestressed steel wire is 80μm to 100μm.
[0040] In some specific embodiments, the thickness of the cement mortar protective layer 11 ≥ 25mm.
[0041] In some specific embodiments, the thickness of the external anti-corrosion layer 12 of the pipe is 0.6mm to 2.4mm.
[0042] Among them, the thickness of the external anti-corrosion layer 12 of the pipe can be, but is not limited to, 0.6mm, 1.0mm, 1.5mm, 2.0mm or 2.4mm, and can also be any value between 0.6mm and 2.4mm.
[0043] In order to achieve the anti-corrosion effect of the prestressed protection structure on the PCCP pipe, it is necessary to have durability and anti-corrosion properties. By limiting the thicknesses of the anti-corrosion layer 10 of the prestressed steel wire, the cement mortar protective layer 11 and the external anti-corrosion layer 12 of the pipe, the anti-corrosion layer 10 of the prestressed steel wire can be closely attached to the prestressed steel wire 22, and the overall protection effect of the prestressed protection structure can change according to actual needs, avoiding the lack of mutual protection between the anti-corrosion layer 10 of the prestressed steel wire, the cement mortar protective layer 11 and the external anti-corrosion layer 12 of the pipe due to unreasonable thicknesses of each layer structure, which affects the overall protection effect of the prestressed protection structure.
[0044] In order to increase the bonding strength between the cement mortar protective layer 11 and the anti-corrosion layer 10 of the prestressed steel wire, by spraying a neat cement layer, the mortar protection interlayer is closely bonded to the pipe core.
[0045] In some specific embodiments, it further includes a neat cement layer, and the neat cement layer is arranged between the anti-corrosion layer 10 of the prestressed steel wire and the cement mortar protective layer 11.
[0046] The neat cement layer is on the surface of the steel wire anti-corrosion layer, making its surface rough and improving the bonding tightness between the cement mortar protective layer 11 and the anti-corrosion layer 10 of the prestressed steel wire.
[0047] In order to improve the bonding ability of the neat cement layer to the anti-corrosion layer 10 of the prestressed steel wire and the cement mortar protective layer 11, it is necessary to set the thickness of the neat cement layer.
[0048] In some specific embodiments, the coating amount of the neat cement layer is 0.4L / m 2 ~0.5L / m 2 .
[0049] Among them, the coating amount of the neat cement layer can be, but is not limited to, 0.4 L / m 2 , 0.43 L / m 2 , 0.46 L / m 2 , 0.48 L / m 2 or 0.5 L / m 2 , and can also be 0.4 L / m 2 ~0.5 L / m 2 any value between them.
[0050] The bonding tightness between the cement mortar protective layer 11 and the prestressed steel wire anticorrosive layer 10 is improved through the neat cement layer, avoiding peeling off and affecting the protection effect; the prestressed steel wire anticorrosive layer 10 is closely attached to the PCCP pipe without anticorrosive vacancy; the external anticorrosive layer 12 of the pipe protects the cement mortar protective layer 11.
[0051] Among them, the cement used in the neat cement is the same as the cement used in the cement mortar protective layer 11, and the water-cement ratio of the neat cement is preferably 0.6 - 0.7.
[0052] In order to improve the protection effect on the prestressed steel wire 22, when setting the prestressed steel wire anticorrosive layer 10, the prestressed steel wire anticorrosive layer 10 can be arranged in a fully wrapped structure around the outer circumference of the prestressed steel wire 22. Through this structure, the prestressed steel wire 22 can be fully wrapped by the prestressed steel wire anticorrosive layer 10, avoiding the vacancy of the unprotected structure and improving the protection effect.
[0053] In some specific embodiments, the prestressed steel wire anticorrosive layer 10 is a fully wrapped structure, and the fully wrapped structure includes the prestressed steel wire anticorrosive layer 10 wrapped around the outer circumference of the prestressed steel wire 22.
[0054] Since the fully wrapped structure requires pre-treatment of the prestressed steel wire 22 to fully wrap the prestressed steel wire protective layer on the prestressed steel wire 22, in specific implementation, in order to reduce the pre-treatment, the prestressed steel wire anticorrosive layer 10 can also be set as a semi-wrapped structure.
[0055] In some specific embodiments, the prestressed steel wire anticorrosive layer 10 is a semi-wrapped structure, and the semi-wrapped structure includes the prestressed steel wire anticorrosive layer 10 covering the surface of the prestressed steel wire 22 that is not in contact with the PCCP pipe and covering the PCCP pipe between adjacent prestressed steel wires 22.
[0056] Through the semi-wrapped structure, the prestressed steel wire anticorrosive layer 10 wraps the PCCP pipe and the exposed part of the outer circumference of the prestressed steel wire 22, realizing close adhesion with the PCCP pipe, avoiding the vacancy of the unprotected structure, and improving the protection effect.
[0057] Therefore, the anti-corrosion layer 10 of the prestressed steel wire is not limited to semi-wrapping the prestressed steel wire 22 by wrapping the prestressed steel wire 22 before wire winding or overall spraying after wire winding. Different anti-corrosion layer thicknesses can be set according to the influence of the wire winding tensile force on the wear resistance of the prestressed steel wire 22, or the semi-wrapping wire method or the full-wrapping wire method of overall spraying can be selected, and the prestressed protection structure can be flexibly applied.
[0058] Through the layer-by-layer cooperation of the anti-corrosion layer 10 of the prestressed steel wire, the cement mortar protection layer 11, the external anti-corrosion layer 12 of the pipe body, and the neat cement slurry layer, the technical problems existing in the prior art that in areas with serious corrosion, the external protection system of the prestressed concrete cylinder pipe has poor effect, resulting in the corrosion of the mortar protection layer, poor durability, and burst pipes caused by broken wires are further solved.
[0059] The prestressed protection structure is mainly applied to PCCP pipes. To solve the problem that there is a lack of PCCP pipes with prestressed protection structures in the prior art, on the other hand, the present invention provides a PCCP pipe, which includes a pipe core concrete layer 20, a steel cylinder 21 arranged in the pipe core concrete layer 20, prestressed steel wires 22 wound around the outer periphery of the pipe core concrete layer 20, and the above-mentioned prestressed protection structure arranged on the prestressed steel wires 22.
[0060] Compared with the prior art, in the structure of the prestressed concrete cylinder pipe, the anti-corrosion layer 10 of the prestressed steel wire, the cement mortar protection layer 11, and the external anti-corrosion layer 12 of the pipe body are added. Each layer jointly undertakes the protection of the pipeline prestress, improves the operation safety performance of the pipeline, and extends the service life.
[0061] In some specific embodiments, it further includes a pipe socket 30 and a pipe socket 40 distributed at both ends of the PCCP pipe, and the pipe socket 30 and the pipe socket 40 are cooperatively connected.
[0062] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments. Obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0063] Embodiment 1
[0064] Combined with Figures 1 to 4A PCCP pipe with a prestressed protection structure will be described. It includes a core concrete layer 20, a steel cylinder 21 disposed within the core concrete layer 20, prestressed steel wires 22 wound around the outer periphery of the core concrete layer 20, and the above-mentioned prestressed protection structure disposed on the prestressed steel wires 22. The prestressed protection structure includes a prestressed steel wire anti-corrosion layer 10 with a full-wrap structure, a cement mortar protection layer 11, and an outer pipe anti-corrosion layer 12. The prestressed steel wire anti-corrosion layer 10 wraps around the outer periphery of the prestressed steel wires 22 to form a full-wrap structure. A cement paste layer is provided between the prestressed steel wire anti-corrosion layer 10 and the cement mortar protection layer 11. The cement paste layer is sprayed and has a thin thickness, so it is not shown in the figure.
[0065] Among them, the thickness of the prestressed steel wire anti-corrosion layer 10 is 80 μm, the thickness of the cement mortar protection layer 11 is 1.2 mm, and the thickness of the outer pipe anti-corrosion layer 12 is 80 μm.
[0066] The material of the prestressed steel wire anti-corrosion layer 10 includes epoxy resin, polyurethane, high-density polyethylene, and a metal anti-corrosion nano-penetrating material. The cement mortar protection layer 11 is a protection layer for the prestressed steel wire anti-corrosion layer 10. The freshly mixed cement mortar should meet the performance requirements of GB / T 19685. When manufacturing the cement mortar protection layer 11, a layer of cement paste should be first sprayed on the surface of the wire-wound core to make its surface rough. The cement used for the cement paste is the same as that for the cement mortar protection layer 11. The water-cement ratio of the cement paste is 0.6, and the coating amount is 0.45 L / m 2 , ensuring that the cement mortar protection layer 11 is tightly connected to the prestressed steel wire anti-corrosion layer 10.
[0067] The outer pipe anti-corrosion layer 12 designs the anti-corrosion of the cement mortar protection layer 11 according to the provisions of GB50046. When applying the anti-corrosion material, the provisions of GB50212 should be followed. The quality of the anti-corrosion construction should be evaluated according to the provisions of GB50224.
[0068] In the prestressed steel cylinder concrete pipe structure, the prestressed steel wire anti-corrosion layer 10, the cement mortar protection layer 11, and the outer pipe anti-corrosion layer 12 are added, and each layer jointly undertakes the protection of the pipe prestress; through the layer-by-layer cooperation of the prestressed steel wire anti-corrosion layer 10, the cement mortar protection layer 11, the outer pipe anti-corrosion layer 12, and the cement paste layer, the operation safety performance of the pipe is increased and the service life is extended; the technical problems existing in the prior art, such as in areas with severe corrosion, the poor effect of the outer pipe protection system leading to the corrosion of the mortar protection layer, poor durability, and broken wires resulting in pipe bursts, are solved.
[0069] Example 2
[0070] Combined with Figures 5 to 6It should be noted that, different from Embodiment 1, the anti-corrosion layer 10 of the prestressed steel wire is a semi-wrapped structure. The anti-corrosion layer 10 of the prestressed steel wire covers the surface of the prestressed steel wire 22 that is not in contact with the PCCP pipe, and covers the PCCP pipe between adjacent prestressed steel wires 22, that is, covers the surface of the prestressed steel wire 22 that is not in contact with the core concrete layer 20, and covers the core concrete layer 20 between adjacent prestressed steel wires 22, wrapping the whole PCCP pipe inside to avoid anti-corrosion vacancies.
[0071] The anti-corrosion layer 10 of the prestressed steel wire with a semi-wrapped structure wraps the PCCP pipe and the exposed part of the outer periphery of the prestressed steel wire 22 inside, realizing a close fit with the PCCP pipe, avoiding the vacancy of the non-protective structure, and improving the protective effect.
[0072] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it is still possible to modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. A prestressed protection structure, characterized in that, it includes: A prestressed steel wire anticorrosion layer (10), a cement mortar protection layer (11) and an outer pipe anticorrosion layer (12) arranged in sequence. The prestressed steel wire anticorrosion layer (10) is used to prevent the prestressed steel wire (22) from corroding; The prestressed steel wire anticorrosion layer (10) is a semi-wrapped structure. The semi-wrapped structure includes that the prestressed steel wire anticorrosion layer (10) covers the surface of the prestressed steel wire (22) that is not in contact with the PCCP pipe, and covers the PCCP pipe between adjacent prestressed steel wires (22).
2. The prestressed protection structure according to claim 1, characterized in that, the thickness of the prestressed steel wire anticorrosion layer (10) is 60μm to 120μm.
3. The prestressed protection structure according to claim 2, characterized in that, the thickness of the prestressed steel wire anticorrosion layer (10) is 80μm to 100μm.
4. The prestressed protection structure according to claim 1, characterized in that, the thickness of the cement mortar protection layer (11) is ≥25mm.
5. The prestressed protection structure according to claim 1, characterized in that, the thickness of the outer pipe anticorrosion layer (12) is 0.6mm to 2.4mm.
6. The prestressed protection structure according to any one of claims 1 to 5, characterized in that, it further includes a neat cement layer, and the neat cement layer is arranged between the prestressed steel wire anticorrosion layer (10) and the cement mortar protection layer (11).
7. The prestressed protection structure according to claim 6, characterized in that, The coating amount of the neat cement layer is 0.4 L / m 2 ~0.5 L / m 2 .
8. A PCCP pipe with a prestressed protection structure, characterized in that, it includes a core concrete layer (20), a steel cylinder (21) arranged in the core concrete layer (20), prestressed steel wires (22) wound around the outer periphery of the core concrete layer (20), and the prestressed protection structure according to any one of claims 1 to 7 arranged on the prestressed steel wires (22); it further includes a pipe socket (30) and a pipe socket (40) distributed at both ends of the PCCP pipe, and the pipe socket (30) and the pipe socket (40) are connected in a matching manner.