High performance composite water delivery pipe

Abstract

The utility model provides a kind of high-performance composite water delivery pipeline, the structure includes from inside to outside: inner fiber reinforced composite material (FRP) pipe, inner concrete layer, inner steel pipe, shear nail, inner ultra high performance concrete (UHPC) layer, prestressed reinforcement, outer UHPC layer and outer FRP pipe.The utility model has the advantages of high pressure-bearing capacity, excellent durability, long service life, low maintenance cost and strong extreme load resistance by the above multilayer composite structure design, especially suitable for urban pipe network, long-distance water delivery, water power generation water diversion system, submarine water delivery, corrosive medium transportation and other fields with strict performance requirements for pipeline.

Description

Technical Field

[0001] This utility model mainly relates to the field of water pipeline technology, and in particular to a high-performance composite water pipeline. Background Technology

[0002] As a core infrastructure in urban pipe networks, long-distance water transmission, and hydropower water diversion systems, the performance of pressurized water transmission pipelines directly affects water transmission safety, project lifespan, and operation and maintenance costs. Currently, prestressed concrete cylinder pipes (PCCP) are widely used in the field of large-diameter pressurized water transmission pipelines. The core design of this pipe material lies in: prestressed steel bars applying prestress to the pipe body, which can effectively counteract the circumferential tension generated by internal water pressure; the outer layer of cement mortar not only provides structural support but also covers the prestressed steel bars to provide corrosion protection; and the inner steel cylinder enhances the circumferential strength of the structure, thereby improving the pipeline's pressure resistance.

[0003] However, with the increasing complexity of engineering environments and the ever-increasing demands on pipeline durability, PCCPs have also revealed some problems during their service: insufficient durability, PCCPs rely on mortar layers to protect prestressed steel bars, but in corrosive environments such as chloride and sulfate, the mortar is prone to carbonization and cracking, leading to exposed steel wires and corrosion, ultimately causing wire breakage or even pipe bursting accidents; high operation and maintenance costs, as corrosion protection of prestressed steel bars usually requires additional anti-corrosion coatings, which are time-consuming and expensive to apply; and weak resistance to extreme loads, when explosive loads are applied to PCCPs, the pipeline will face the risk of rupture, causing incalculable losses. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a high-performance composite water transmission pipeline structure that addresses the shortcomings of the existing technology. Through layered design and collaborative working mechanism, it can significantly improve the pipeline's pressure-bearing capacity, durability, service life, maintenance cost, and resistance to extreme loads. It can be used in urban pipe networks, long-distance water transmission, hydropower water diversion systems, and other fields.

[0005] To solve the above-mentioned technical problems, the technical solution adopted in this application is:

[0006] A high-performance composite water transmission pipeline, comprising, from the inside out, an inner FRP pipe, an inner steel pipe, and an outer FRP pipe.

[0007] The inner FRP pipe, inner steel pipe, and outer FRP pipe are coaxially arranged.

[0008] An inner concrete layer is installed between the inner FRP pipe and the inner steel pipe; a UHPC layer is installed between the inner steel pipe and the outer FRP pipe.

[0009] Several shear studs are installed on the inner steel pipe. The shear studs are evenly distributed along the axial direction of the inner steel pipe and evenly distributed along the circumferential direction of the inner steel pipe.

[0010] The UHPC layer consists of an inner UHPC layer and an outer UHPC layer; prestressed steel bars are installed between the inner UHPC layer and the outer UHPC layer.

[0011] Preferably, the prestressed steel bars are spiral-shaped and wound at equal intervals on the outer surface of the inner UHPC layer, with a spacing of 5cm to 10cm and a winding angle of 1° to 3°.

[0012] Preferably, the thickness of the inner FRP tube is 0.5cm; the thickness of the outer FRP tube is 0.5cm.

[0013] Preferably, the inner concrete layer is made of C40 grade concrete.

[0014] Preferably, the UHPC layer comprises cement, silica fume, quartz powder, fine sand, and steel fibers.

[0015] As a preferred option, the inner steel pipe is made of Q345 carbon structural steel; the prestressed steel bar is made of SWRH77B high carbon steel.

[0016] Preferably, the thickness of the inner concrete layer is 1 / 40 of the outer diameter of the inner FRP pipe; the thickness of the inner UHPC layer is 1 / 20 to 1 / 10 of the outer diameter of the inner FRP pipe; and the thickness of the outer UHPC layer is 1 / 40 of the outer diameter of the inner FRP pipe.

[0017] Preferably, the thickness of the inner steel pipe is 1 / 200 of the outer diameter of the inner FRP pipe, and the diameter of the prestressed steel bar is 1 / 50 of the outer diameter of the inner FRP pipe.

[0018] Preferably, the axial spacing of the shear studs is 5cm to 20cm.

[0019] Preferably, the height of the shear stud is 1 / 3 to 2 / 3 of the thickness of the inner UHPC layer.

[0020] This application has the following beneficial effects:

[0021] 1. Excellent compressive strength: The inner FRP pipe has excellent circumferential tensile properties. Under internal pressure, FRP can fully exert its tensile properties, greatly improving the structure's internal pressure bearing capacity; UHPC has a compressive strength much higher than ordinary concrete, which can significantly enhance the structure's external pressure resistance.

[0022] 2. Excellent durability: The outer FRP pipe can resist the erosion of harsh environments. At the same time, UHPC can inhibit the generation of its own micro-cracks. The outer FRP pipe and the outer UHPC layer work together to significantly reduce the risk of prestressed steel reinforcement exposure, thereby avoiding wire breakage and pipe bursting accidents. The inner FRP pipe and the inner concrete layer work together to protect the inner steel pipe from corrosion threats.

[0023] 3. Excellent flow capacity: The inner wall of FRP pipe is smoother than that of traditional PCCP concrete inner wall, which can significantly reduce hydraulic friction and provide a smooth flow surface.

[0024] 4. Resistance to extreme loads: The inner steel pipe, inner UHPC layer and shear studs, outer UHPC layer and outer FRP pipe work together to significantly improve the pipeline's resistance to extreme loads.

[0025] 5. Lightweight structure: Compared with ordinary concrete layers, UHPC layers can achieve the same structural load-bearing capacity with a smaller thickness, thereby reducing the overall thickness of pressure pipelines; at the same time, the inner FRP pipe, with its excellent corrosion resistance, can also reduce the thickness of the inner concrete layer. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the cross-sectional structure of a high-performance composite water conveyance pipeline proposed in this utility model.

[0027] Figure 2 This is a schematic diagram of the longitudinal section structure of this utility model.

[0028] Figure 3 This is a schematic diagram of the arrangement of the inner steel pipe and shear studs of this utility model.

[0029] Figure 4 This is the overall structural design drawing of this utility model.

[0030] The components are: 1. Inner FRP pipe; 2. Inner concrete layer; 3. Inner steel pipe; 4. Shear studs; 5. Inner UHPC layer; 6. Prestressed steel reinforcement; 7. Outer UHPC layer; 8. Outer FRP pipe. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and specific preferred embodiments.

[0032] In the description of this utility model, it should be understood that the terms "left side," "right side," "upper part," "lower part," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. "First," "second," etc., do not indicate the importance of the components, and therefore should not be construed as a limitation of this utility model. The specific dimensions used in this embodiment are only for illustrating the technical solution and do not limit the protection scope of this utility model.

[0033] like Figures 1-4As shown, a high-performance composite water transmission pipeline comprises, from the inside out, an inner FRP pipe 1, an inner steel pipe 3, and an outer FRP pipe 8, all coaxially arranged. Both the inner FRP pipe 1 and the outer FRP pipe 8 are made of FRP material, i.e., fiber-reinforced composite material, composed of glass fiber reinforcement and polymer resin. The wall thickness of both the inner FRP pipe 1 and the outer FRP pipe 8 is 0.5 cm. The inner steel pipe 3 is preferably made of Q345 carbon structural steel, and its thickness is 1 / 200th of the outer diameter of the inner FRP pipe 1.

[0034] An inner concrete layer 2 is provided between the inner FRP pipe 1 and the inner steel pipe 3. The inner concrete layer 2 is made of C40 grade concrete, and its thickness is 1 / 40 of the outer diameter of the inner FRP pipe 1. The inner FRP pipe 1 and the inner concrete layer 2 provide excellent corrosion resistance and a smooth water delivery interface. A UHPC layer is provided between the inner steel pipe 3 and the outer FRP pipe 8. The UHPC layer, or ultra-high performance concrete layer, is a special concrete material with ultra-high strength, high toughness, and high durability. The UHPC layer includes cement, silica fume, quartz powder, fine sand, and steel fibers.

[0035] The UHPC layer consists of an inner UHPC layer 5 and an outer UHPC layer 7. The thickness of the inner UHPC layer 5 is 1 / 20 to 1 / 10 of the outer diameter of the inner FRP pipe 1, and the thickness of the outer UHPC layer 7 is 1 / 40 of the outer diameter of the inner FRP pipe 1. Prestressed steel bars 6 are installed between the inner UHPC layer 5 and the outer UHPC layer 7. The prestressed steel bars 6 are spirally wound at equal intervals on the outer surface of the inner UHPC layer 5, with adjacent spacing of 5cm to 10cm or a winding angle of 1° to 3°. The prestressed steel bars 6 are made of SWRH77B high-carbon steel. The diameter of the prestressed steel bars 6 is 1 / 50 of the outer diameter of the inner FRP pipe 1. The prestressed steel bars 6 effectively improve the overall crack resistance and load-bearing capacity of the pipeline.

[0036] The inner steel pipe 3 is equipped with a number of shear studs 4 (the number of shear studs 4 n≥1). The top rod of the shear stud 4 is welded to the outer surface of the inner steel pipe 3. The shear studs 4 are evenly distributed along the axial direction of the inner steel pipe 3, with an axial spacing of 5cm to 20cm. The shear studs 4 are also evenly arranged circumferentially according to the pipe size. The height of the shear studs 4 is 1 / 3 to 2 / 3 of the thickness of the inner UHPC layer 5. The inner steel pipe 3 and the inner UHPC layer 5 are tightly connected by the shear studs 4 to form a whole, which can enhance the rigidity of the water transmission pipeline structure.

[0037] The pipeline structure of this application, from the inside out, includes an inner FRP pipe 1, an inner concrete layer 2, an inner steel pipe 3, shear studs 4, an inner UHPC layer 5, prestressed steel bars 6, an outer UHPC layer 7, and an outer FRP pipe 8. The inner FRP pipe 1 possesses excellent circumferential tensile strength. Under internal pressure, the PCCP pipe experiences stress later than the inner FRP pipe 1, fully utilizing the tensile strength of FRP and significantly improving the structural internal pressure bearing capacity. The compressive strength of UHPC is far higher than that of ordinary concrete, significantly enhancing the structure's resistance to external pressure. The outer FRP pipe 8 can resist corrosion from harsh environments. Simultaneously, UHPC can inhibit the formation of microcracks. The outer FRP pipe 8 and the outer UHPC layer 7 work synergistically to prevent the exposure risk of the prestressed steel bars 6, thus avoiding wire breakage and pipe burst accidents. The inner FRP pipe 1 and the inner concrete layer 2 work synergistically to protect the inner steel pipe 3 from corrosion. The smoothness of the inner wall of the FRP pipe is significantly better than that of the traditional PCCP concrete inner wall, significantly reducing hydraulic friction and providing a smooth flow surface. The inner steel pipe 3, the inner UHPC layer 5, and the shear studs 4 work together to significantly improve the pipeline's ability to resist extreme loads. In addition, this application provides a lightweight structure. Compared with ordinary concrete, UHPC can achieve the same structural load-bearing capacity with a thinner cross section, thereby reducing the thickness of the concrete. At the same time, the inner FRP pipe 1, with its excellent corrosion resistance, can reduce the thickness of the internal concrete layer.

[0038] This utility model provides a high-performance composite water transmission pipeline structure. Through the above-mentioned multi-layer composite structure design, it makes full use of the advantages of each layer of materials and achieves synergistic work, providing an innovative solution for the design of large-diameter pressure water transmission pipelines. It solves the shortcomings of traditional PCCP in corrosive environments, high water pressure and extreme load conditions, effectively integrates the advantages of different materials, and improves the pressure bearing capacity, durability, service life, maintenance cost and resistance to extreme loads. It can be used in urban pipe networks, long-distance water transmission, hydropower water diversion systems, submarine water transmission, and corrosive media transportation.

[0039] The preferred embodiments of this application have been described in detail above. However, this application is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this application, various equivalent transformations can be made to the technical solution of this application, and all such equivalent transformations fall within the protection scope of this application.

Claims

1. A high-performance composite water transmission pipeline, characterized in that: The pipeline consists of an inner FRP pipe, an inner steel pipe, and an outer FRP pipe, from the inside out. The inner FRP pipe, inner steel pipe, and outer FRP pipe are coaxially arranged. An inner concrete layer is installed between the inner FRP pipe and the inner steel pipe; a UHPC layer is installed between the inner steel pipe and the outer FRP pipe. Several shear studs are installed on the inner steel pipe. The shear studs are evenly distributed along the axial direction of the inner steel pipe and evenly distributed along the circumferential direction of the inner steel pipe. The UHPC layer consists of an inner UHPC layer and an outer UHPC layer; prestressed steel bars are installed between the inner UHPC layer and the outer UHPC layer.

2. The high-performance composite water transmission pipeline according to claim 1, characterized in that: The prestressed steel bars are spiral in shape and are wound at equal intervals on the outer surface of the inner UHPC layer, with a spacing of 5cm to 10cm and a winding angle of 1° to 3°.

3. The high-performance composite water transmission pipeline according to claim 1, characterized in that: The thickness of the inner FRP tube is 0.5cm; the thickness of the outer FRP tube is 0.5cm.

4. The high-performance composite water transmission pipeline according to claim 1, characterized in that: The inner concrete layer is made of C40 grade concrete.

5. A high-performance composite water transmission pipeline according to claim 1, characterized in that: The UHPC layer consists of cement, silica fume, quartz powder, fine sand, and steel fibers.

6. A high-performance composite water transmission pipeline according to claim 1, characterized in that: The inner steel pipe is made of Q345 carbon structural steel; the prestressed steel bars are made of SWRH77B high carbon steel.

7. A high-performance composite water transmission pipeline according to claim 1, characterized in that: The thickness of the inner concrete layer is 1 / 40 of the outer diameter of the inner FRP pipe; the thickness of the inner UHPC layer is 1 / 20 to 1 / 10 of the outer diameter of the inner FRP pipe; and the thickness of the outer UHPC layer is 1 / 40 of the outer diameter of the inner FRP pipe.

8. A high-performance composite water transmission pipeline according to claim 1, characterized in that: The thickness of the inner steel pipe is 1 / 200 of the outer diameter of the inner FRP pipe, and the diameter of the prestressed steel bar is 1 / 50 of the outer diameter of the inner FRP pipe.

9. A high-performance composite water transmission pipeline according to claim 1, characterized in that: The axial spacing of shear studs is 5cm to 20cm.

10. A high-performance composite water transmission pipeline according to claim 1, characterized in that: The height of the shear stud is 1 / 3 to 2 / 3 of the thickness of the inner UHPC layer.

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