A prefabricated tooling for glass fiber reinforced plastic wrapped reinforced concrete composite pipe

Abstract

The utility model discloses a prefabricated tooling for a composite pipe of FRP outer-clad reinforced concrete, comprising a support ring and a connector; two support rings are provided, which are respectively used to be arranged at both ends of an FRP pipe, and the support ring comprises a support portion for inserting into the FRP pipe to support the inner wall of the FRP pipe, and a limit portion for abutting against the end face of the FRP pipe; the connector is used to connect the two support rings to limit the movement of the support ring in the axial direction of the FRP pipe. The prefabricated tooling for a composite pipe of FRP outer-clad reinforced concrete of the utility model adopts a double-end support ring design, and the inner support portion accurately fits and supports the inner wall of the FRP pipe, effectively preventing the deformation of the pipe wall during pouring concrete, and ensuring the roundness of the inner wall of the composite pipe. The outer limit portion tightly abuts against the end face of the FRP pipe to ensure the flatness of the end face. The combination of the two ensures that the geometric shapes of the two ends of the composite pipe are precisely consistent, providing ideal docking conditions for socket connection, and greatly improving the sealing and structural stability of the connection.

Description

Technical Field

[0001] The utility model relates to the field of composite material pipeline connection, in particular to a prefabricated tooling for glass fiber reinforced plastic-wrapped reinforced concrete composite pipe. Background Art

[0002] In the field of nuclear power engineering, fiberglass reinforced concrete composite pipes are widely used due to their unique performance advantages. Figure 1 As shown, this type of composite pipe combines the advantages of both FRP and reinforced concrete pipes: FRP pipes are renowned for their light weight, high strength, excellent seawater corrosion resistance, and low flow resistance, while reinforced concrete pipes are favored for their thicker walls and stiffness, economical construction, and strong resistance to deep overburden pressure. The composite pipe design cleverly combines the characteristics of both, achieving optimal performance and cost-effectiveness.

[0003] The traditional composite pipe prefabrication process typically involves prefabricating fiberglass reinforced plastic (FRP) pipes in a factory, followed by concrete pouring at the construction site. However, this method is plagued by lengthy construction cycles and high costs. It is worth noting that in actual applications, such composite pipes often need to be spliced ​​together in multiple sections to meet engineering requirements, with the connections between sections primarily made using a splice-and-socket method. Specifically, the inner end of the FRP pipe of the second composite pipe section must be precisely inserted into the outer end of the FRP pipe of the first composite pipe section, and so on, to construct a continuous piping system. During this process, it is crucial to ensure the roundness and absence of deformation at the splice-and-socket locations between adjacent composite pipes, as this is a key factor in ensuring sealing performance and preventing leakage.

[0004] However, in real-world production, cost-effectiveness often leads to reduced wall thickness for FRP pipes. This leads to deformation during concrete pouring and subsequent processing, particularly in maintaining roundness at both ends. This creates a significant challenge: when the roundness of the ends of FRP-encased reinforced concrete composite pipes is compromised and fails to meet stringent socket and splice requirements, it severely impacts the pipeline's construction and installation progress, as well as the quality of the project.

[0005] Therefore, how to effectively prevent the deformation of FRP-wrapped reinforced concrete composite pipes during prefabrication and use due to the thin wall of the FRP pipe, especially the misalignment of the roundness at both ends, while ensuring cost-effectiveness, so as to ensure its sealing performance during socket connection and smooth construction and installation. Utility Model Content

[0006] In order to solve the above problems, the utility model provides a prefabricated tooling for glass fiber reinforced plastic-wrapped reinforced concrete composite pipes.

[0007] The utility model provides a prefabricated tooling for glass fiber reinforced plastic wrapped reinforced concrete composite pipes, which adopts the following technical solutions:

[0008] A prefabricated tooling for a FRP-coated reinforced concrete composite pipe comprises a support ring and a connector; two support rings are provided, one for being arranged at each end of an FRP pipe, the other for being inserted into the FRP pipe to support the inner wall of the FRP pipe, and a limiting portion for abutting the end face of the FRP pipe; the connector is used to connect the two support rings and limit the movement of the support rings in the axial direction of the FRP pipe.

[0009] Through the above technical solution, through the double-end support ring design, the inner support part ensures the roundness of the inner wall of the FRP pipe, the outer limit part ensures the flatness of the end face, and the connecting piece prevents the axial displacement of the support ring, which together ensures that the composite pipe maintains a precise geometric shape during the concrete pouring process and improves the sealing and stability of the socket connection.

[0010] As a preferred embodiment of the present invention, the limiting portion extends in the radial direction away from the FRP tube to form a baffle portion, the baffle portion abuts against the outer formwork, a concrete pipe pouring space is formed between the outer formwork, the FRP tube and the baffle portion, and a grouting hole connected to the concrete pipe pouring space is also provided on the baffle portion.

[0011] Through this technical solution, the baffle is positioned radially away from the FRP tube, providing not only additional support points but also tightly contacting the outer formwork, forming a stable support frame structure. This design helps enhance the overall structural stability of the composite tube during concrete pouring, preventing deformation caused by concrete pouring pressure. This ensures precise definition of the concrete pouring space, allowing concrete to evenly fill the desired size and shape, improving the precision of the composite tube molding and ensuring that the finished product meets design requirements.

[0012] The grouting holes set on the baffle provide a direct channel for concrete pouring, allowing the concrete to be smoothly poured into the predetermined area, simplifying the construction process, improving work efficiency, and reducing potential errors and omissions in the concrete pouring process, thereby improving construction quality.

[0013] As a preferred embodiment of the present invention, the support ring also includes a guide portion, which is arranged at an end of the support portion away from the limiting portion. The diameter of the guide portion gradually decreases from the end connected to the support portion to the end away from the limiting portion, and the connection between the guide portion and the support portion is an arc-shaped transition connection.

[0014] Through the above technical solution, by adding a guide part with a tapered design and arc-shaped transition, the support ring is easy to insert into the FRP tube, reducing installation resistance, while enhancing the contact stability with the inner wall and further improving the roundness retention performance.

[0015] As a preferred embodiment of the present invention, the connecting member includes connecting screws, and the connecting screws are respectively locked and connected to the support rings.

[0016] Through the above technical solution, a connecting screw is selected as a connecting part to achieve a quick and firm connection of the support ring. It only needs to tighten the screw to fix it axially. It is easy to operate and has high connection strength, which effectively prevents the support ring from being displaced by external force during construction.

[0017] As a preferred embodiment of the present invention, it further comprises a support assembly disposed in the FRP tube, wherein the support assembly abuts against the inner wall of the FRP tube.

[0018] Through the above technical solution, by adding an inner wall support component, a radial support force is directly applied to the inner wall of the FRP pipe, which significantly enhances its anti-deformation ability during the concrete pouring and curing process.

[0019] As a preferred embodiment of the present invention, the support assembly includes at least one support plate, a conical guide groove is provided at the center of the support plate, a conical guide block is provided on the connecting screw, and the conical guide groove is sleeved on the conical guide block.

[0020] Through the above technical solution, the support plate cooperates with the conical guide block on the connecting screw with the help of the central conical guide groove. As the screw is screwed in, the support plate can be accurately guided and pressed against the inner wall of the FRP tube in the radial direction, forming a firm abutment, ensuring that the support plate fits tightly against the inner wall, effectively transmitting the supporting force, and enhancing the FRP tube's ability to resist deformation.

[0021] As a preferred embodiment of the present invention, a clamping rod is provided on the support ring on the side with a smaller diameter of the conical guide block. After the support ring is locked with the connecting screw, the clamping rod abuts against the support plate to clamp the conical guide groove and the conical guide block.

[0022] Through the above technical solution, the clamping rod is designed to abut against the support plate after the support ring and the connecting screw are locked, preventing the support plate and the guide block from sliding during the force application process, ensuring that the support plate continuously and stably adheres to the inner wall of the FRP pipe, maintaining effective radial support, enhancing the roundness retention effect, and providing a solid inner wall morphology foundation for the socket connection of the composite pipe.

[0023] In summary, the present invention has at least one of the following beneficial technical effects:

[0024] 1. This utility model's prefabricated tooling for FRP-encased reinforced concrete composite pipes utilizes a double-end support ring design. The inner support portion precisely fits and supports the inner wall of the FRP pipe, effectively preventing pipe wall deformation during concrete pouring and ensuring the inner roundness of the composite pipe. The outer stopper tightly abuts the FRP pipe end face, ensuring a smooth end face. This combination ensures precise geometric consistency at both ends of the composite pipe, providing ideal docking conditions for socket connections and significantly improving the joint's sealing and structural stability.

[0025] 2. Using connecting screws as the connecting parts between the support rings is simple and quick to operate. You only need to tighten the screws to achieve axial fixation. The connection strength is high, which effectively prevents the support rings from being displaced due to external forces during the construction process.

[0026] 3. The support components installed within the fixture, particularly the support plate with tapered guide grooves, work in conjunction with the tapered guide blocks on the connecting screws, allowing the support plate to fit tightly and evenly against the inner wall of the FRP pipe, providing strong radial support. This design is particularly beneficial for enhancing the deformation resistance of thin areas of the FRP pipe wall, significantly improving the connection seal and the overall load-bearing performance of the pipe.

[0027] 4. The design of the clamping rod further improves the stability of the tooling. When the support ring and the connecting screw are locked, the clamping rod abuts against the support plate to prevent sliding between the support plate and the guide block, ensuring that the support plate always abuts tightly against the inner wall of the FRP pipe, providing continuous and stable radial support, ensuring that the inner wall shape of the composite pipe remains constant during construction and use, greatly improving the construction quality of the socket connection and the safety of the pipeline during service. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural diagram of the prior art.

[0029] Figure 2 It is a structural diagram of embodiment 1 of the present utility model.

[0030] Figure 3 It is a structural schematic diagram of the support ring of the utility model.

[0031] Figure 4 It is a structural diagram of embodiment 2 of the present utility model.

[0032] Explanation of the accompanying reference numerals: 1. Support ring; 2. Connector; 3. FRP pipe; 4. Support assembly; 5. Clamping rod; 6. Concrete pipe; 7. Fixing plate; 8. Grouting hole; 9. Outer formwork; 11. Support portion; 12. Limiting portion; 13. Guide portion; 21. Connecting screw; 22. Bolt; 41. Support plate; 42. Conical guide groove; 43. Conical guide block. DETAILED DESCRIPTION

[0033] The following is combined with Figure 2-4 The utility model is described in further detail.

[0034] Example 1

[0035] like Figures 2 to 3 As shown, this embodiment discloses a prefabricated tooling for a FRP-coated reinforced concrete composite pipe, comprising a support ring 1 and a connector 2. Two support rings 1 are provided, one for placement at each end of an FRP pipe 3. Each support ring 1 comprises a support portion 11 for inserting into the FRP pipe 3 to support the inner wall of the pipe 3, a stopper 12 for abutting the end face of the FRP pipe 3, and a baffle portion 14 extending radially away from the stopper 12, forming a direction away from the FRP pipe 3.

[0036] The support ring 1 also includes a guide portion 13, which is located at the end of the support portion 11 away from the stop portion 12. The diameter of the guide portion 13 gradually decreases from the end connected to the support portion 11 to the end away from the stop portion 12, and the connection between the guide portion 13 and the support portion 11 is an arc-shaped transition. The guide portion 13 allows the support ring 1 to be easily inserted into the FRP tube 3, so that the support portion 11 of the support ring 1 abuts the inner wall of the FRP tube 3. In this embodiment, the support ring 1 is made of steel, which has high strength and stable support, and can effectively support both sides of the FRP tube 3.

[0037] In this embodiment, the support portion 11, the stopper 12, the guide portion 13, and the baffle portion 14 are integrally formed. The baffle portion 14 abuts against the outer formwork 9, forming a concrete pipe casting space between the outer formwork 9, the FRP tube 3, and the baffle portion 14. Grouting holes 8 are also provided on the baffle portion 14, connecting to the concrete pipe casting space. Concrete is poured into the concrete pipe casting space through the grouting holes 8, thereby forming a layer of concrete pipe 6 on the outer circumference of the FRP tube 3.

[0038] The connecting piece 2 is used to connect the two support rings 1 and limit the support rings 1 from moving in the axial direction of the FRP tube 3 .

[0039] In this embodiment, to facilitate the connection between the connector 2 and the support ring 1, a fixing plate 7 is further connected to the support ring 1. The fixing plate 7 and the support ring 1 are integrally formed, or connected by welding, riveting, bolting, or other means. The connector 2 includes connecting screws 21, which pass through the fixing plates 7 connected to the support ring 1 and are locked to the fixing plates 7 via locking nuts 22, thereby achieving a locked connection with the support ring 1. This prevents the two support rings 1 from moving axially in the FRP tube 3 or from separating from the FRP tube 3.

[0040] Example 2:

[0041] The rest of this embodiment is the same as that of embodiment 1, except that, in some cases where the FRP tube 3 in the FRP reinforced concrete composite pipe is relatively long and has a relatively thin wall thickness, or the concrete tube 6 in the FRP reinforced concrete composite pipe is relatively thick, in order to prevent the FRP tube 3 from being deformed too much or even causing damage to the FRP tube 3, Figure 4 As shown, the prefabricated tooling of the FRP outer-wrapped reinforced concrete composite pipe of this embodiment further includes a support assembly 4 arranged in the FRP pipe 3, which is used to abut against the inner wall of the FRP pipe 3 to support the FRP pipe 3 and prevent deformation.

[0042] The support assembly 4 includes at least one support plate 41. The outer surface of the support plate 41 abuts the inner wall of the FRP tube 3. A tapered guide groove 42 is provided in the center of the support plate 41. A tapered guide block 43 is provided on the connecting screw 21. In this embodiment, the tapered guide block 43 can be connected to the connecting screw 21 via threads or fixed to the connecting screw 21 by gluing, screw locking, or other means. The support plate 41 is mounted on the tapered guide block 43 via the tapered guide groove 42.

[0043] A clamping rod 5 is provided on the support ring 1 on the side with the smaller diameter of the tapered guide block 43. In this embodiment, the clamping rod 5 is threadedly connected to the fixing plate 7. After the support ring 1 is tightened with the connecting screw 21, the clamping rod 5 abuts against the support plate 41, clamping the tapered guide groove 42 and the tapered guide block 43. At this time, the support plate 41 is fixed in the axial position, thereby ensuring that the support plate 41 supports the FRP tube 3 in a specific position.

[0044] The above are all preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A prefabricated tooling for glass fiber reinforced plastic wrapped reinforced concrete composite pipe, characterized by: The invention comprises a support ring (1) and a connecting piece (2); two support rings (1) are provided, which are respectively arranged at two ends of an FRP tube (3); the support ring (1) comprises a support portion (11) for inserting into the inside of the FRP tube (3) to support the inner wall of the FRP tube (3), and a limiting portion (12) for abutting against the end surface of the FRP tube (3); the connecting piece (2) is used to connect the two support rings (1) to limit the movement of the support ring (1) in the axial direction of the FRP tube (3).

2. The prefabricated tooling of a glass fiber reinforced plastic wrapped reinforced concrete composite pipe according to claim 1, characterized in that: The limiting portion (12) extends in a radial direction away from the FRP tube (3) to form a baffle portion (14), the baffle portion (14) abuts against the outer template (9), a concrete pipe casting space is formed between the outer template (9), the FRP tube (3) and the baffle portion (14), and a grouting hole (8) communicating with the concrete pipe casting space is also provided on the baffle portion (14).

3. A prefabricated tooling for a glass fiber reinforced plastic-wrapped reinforced concrete composite pipe according to claim 1 or 2, characterized in that: The support ring (1) further comprises a guide portion (13), wherein the guide portion (13) is arranged at an end of the support portion (11) away from the limiting portion (12), the diameter of the guide portion (13) gradually decreases from the end connected to the support portion (11) to the end away from the limiting portion (12), and the connection between the guide portion (13) and the support portion (11) is an arc-shaped transition connection.

4. A prefabricated tooling for a glass fiber reinforced plastic-wrapped reinforced concrete composite pipe according to claim 1 or 2, characterized in that: The connecting member (2) comprises connecting screws (21), and the connecting screws (21) are respectively locked and connected to the supporting rings (1).

5. The prefabricated tooling of the glass fiber reinforced plastic wrapped reinforced concrete composite pipe according to claim 4 is characterized by: It also comprises a support assembly (4) arranged in the FRP tube (3), wherein the support assembly (4) abuts against the inner wall of the FRP tube (3).

6. The prefabricated tooling of the glass fiber reinforced plastic wrapped reinforced concrete composite pipe according to claim 5 is characterized by: The support assembly (4) comprises at least one support plate (41), a conical guide groove (42) is arranged at the center of the support plate (41), a conical guide block (43) is arranged on the connecting screw (21), and the conical guide groove (42) is sleeved on the conical guide block (43).

7. The prefabricated tooling of the glass fiber reinforced plastic wrapped reinforced concrete composite pipe according to claim 6 is characterized by: A clamping rod (5) is provided on the support ring (1) on the side with a smaller diameter of the conical guide block (43); after the support ring (1) and the connecting screw (21) are locked, the clamping rod (5) abuts against the support plate (41) to clamp the conical guide groove (42) and the conical guide block (43).

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