Flexible connecting structure of prestressed reinforced concrete pipe and construction method thereof

Abstract

This invention relates to the field of concrete pipe connection construction technology, and particularly to a flexible connection structure and construction method for prestressed reinforced concrete pipes, including a pipe body, a flexible pipe, and auxiliary accessories. The flexible pipe is composed of a steel frame, steel wire rope, and a rubber sealing layer. The steel frame is generally designed in a trumpet shape, with the diameter of the wide end of the steel frame being larger than the diameter of the narrow end. The steel wire rope connects the steel frame to form a tensile structure. In this solution, through the coordinated design of the steel frame, steel wire rope, and rubber sealing layer of the flexible pipe, and the connectors, clamps, hoops, and filling rubber of the auxiliary accessories, combined with a construction process of precise measurement, standardized cutting, and step-by-step assembly, the pipe connection achieves functions such as pressure resistance and deformation resistance, tensile strength and anti-detachment, sealing and leakage prevention, and adaptability to geological activities. This effectively solves the problems of easy detachment, easy leakage, weak resistance to working conditions, and unstable construction quality of traditional connection structures, and improves the long-term reliability and construction efficiency of underground laying of prestressed reinforced concrete pipes.

Description

Technical Field

[0001] This invention relates to the field of concrete pipe connection construction technology, and in particular to a flexible connection structure and construction method for prestressed reinforced concrete pipes. Background Technology

[0002] Prestressed reinforced concrete pipes are core pipeline components used in municipal engineering, water conservancy projects, and other fields for transporting media such as water, natural gas, and industrial fluids. Due to their advantages such as high strength, high durability, and good impermeability, they are widely used in underground pipeline laying. However, existing connection structures and construction methods for prestressed reinforced concrete pipes still have many technical shortcomings, making them difficult to adapt to the needs of complex underground working conditions.

[0003] Traditional connection methods often use a rigid butt joint structure of "narrow opening insertion into wide opening", which relies on the simple fit of the pipe ends to achieve connection. It lacks an effective flexible buffer and firm fixing mechanism. When underground geological activities such as soil subsidence or minor earthquakes occur, adjacent pipes are prone to misalignment or separation due to lateral pulling or radial compression, resulting in failure of pipeline connection.

[0004] To address this, the present invention proposes a flexible connection structure and construction method for prestressed reinforced concrete pipes. Through the coordinated design of the steel frame, wire rope, rubber seal, and auxiliary accessories such as connectors, clamps, hoops, and filling rubber, along with a construction process of precise measurement, standardized cutting, and step-by-step assembly, the pipe connection achieves functions such as pressure resistance and deformation resistance, tensile resistance and detachment prevention, sealing and leakage prevention, and adaptability to geological activities. This effectively solves the problems of easy detachment, easy leakage, weak resistance to working conditions, and unstable construction quality of traditional connection structures, thereby improving the long-term reliability and construction efficiency of underground prestressed reinforced concrete pipe laying. Summary of the Invention

[0005] The technical problem to be solved: The connection is simple, but it is easy for misalignment or separation to occur due to lateral pulling or radial compression, which leads to the failure of pipeline connection.

[0006] To address the shortcomings of existing technologies, this invention provides a flexible connection structure and construction method for prestressed reinforced concrete pipes, thereby solving the technical problems mentioned in the background section.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A flexible connection structure for a prestressed reinforced concrete pipe includes a pipe body, a flexible pipe, and auxiliary accessories; the flexible pipe is composed of a steel frame, steel wire rope, and a rubber sealing layer; the steel frame is generally designed in a trumpet shape, with the diameter of the wide end of the steel frame being larger than the diameter of the narrow end; the steel wire rope connects the steel frame to form a tensile structure; and the rubber sealing layer is wrapped around the outside of the steel frame and the steel wire rope.

[0009] In one possible implementation, the accessory includes a connector and a retaining ring. Multiple retaining strips are rotatably connected to the outside of the connector, and a hoop is fitted on the outside of the retaining strips. A retaining ring is provided on the right side of the connector and connected to the connector by bolts.

[0010] In one possible implementation, the accessory also includes a filling rubber, which is disposed on the outside of the constricted end of the tube. The filling rubber is a structure of two semi-circular bodies joined together and has a groove on the outside. The inside of the retaining ring can engage with the groove on the outside of the filling rubber.

[0011] In one possible implementation, the retaining ring is a structure in which two semi-circular rings are rotatably connected and their open ends are locked with bolts, and adjacent retaining rings are connected by bolts.

[0012] In one possible implementation, the inner and outer surfaces of the steel frames at opposite ends of two adjacent flexible tubes are abutted.

[0013] In one possible implementation, a construction method for a flexible connection structure of a prestressed reinforced concrete pipe applied to any of the connection structures described above includes the following steps:

[0014] S1: Measure the distance between the two pipes to be connected on site. Take the straight distance from the inside of the wide end of the pipe to the outside of the narrow end of the adjacent pipe as the benchmark, and determine the cutting length of the flexible pipe after leaving the expansion allowance.

[0015] S2: Use special tools to cut the flexible tube, avoiding the steel frame. First cut the rubber seal and then cut the steel wire rope. Grind the cut end of the flexible tube until it is flat.

[0016] S3: Insert the connector into the wide end of the pipe, flip the retaining strip to fit the outside of the wide end of the pipe, put on the hoop and tighten it to fix the connector to the pipe.

[0017] S4: Place the retaining ring between the steel frames at one end of the flexible tube, move the flexible tube so that the wide end of the steel frame is aligned with the connector, connect the retaining ring to the connector with bolts and lock it so that the steel frame and the connector fit tightly together.

[0018] S5: Wrap the filling rubber splice around the outside of the constricted end of the pipe body, fit a retaining ring and engage it with the filling rubber groove, and fix the retaining ring with bolts;

[0019] S6: Install a retaining ring at the other end of the flexible tube, connect the retaining ring to the retaining ring at the constricted end of the tube body with bolts and lock it, so that the constricted end of the flexible tube steel frame is tightly fitted with the filling rubber, thus completing the connection of the tube body, the flexible tube, and the tube body.

[0020] S7: Fit retaining rings onto the adjacent ends of the two flexible pipes to be connected, so that the steel frames of the two flexible pipes are nested. Connect the two retaining rings with bolts and lock them, so that the adjacent steel frames fit tightly together, thereby extending the pipe.

[0021] Beneficial effects compared to existing technologies:

[0022] 1. In this solution, the unique synergistic structure of the flexible pipe's steel frame, wire ropes, and rubber seal ensures comprehensive pipeline performance under complex underground conditions. The flared steel frame acts as a support skeleton, directly offsetting the soil's weight, ground load, and the internal pressure of the transported medium, effectively preventing the flexible pipe from being "flattened" due to compression and ensuring unobstructed flow. The evenly connected wire ropes form a tensile network, which can withstand most of the lateral tensile force when geological activity causes adjacent pipe sections to separate, preventing the flexible pipe from breaking due to localized tensile overload. The outer rubber seal not only physically isolates groundwater and corrosive ions, protecting the steel frame and wire ropes from corrosion and wear, but also, with its high elasticity and ductility, stretches and bends synchronously with the pipeline during geological displacement, returning to its original shape after deformation. This ensures the pipeline's adaptability to deformation and prevents seal failure, ultimately giving the flexible pipe comprehensive performance in terms of pressure resistance, tensile strength, corrosion resistance, sealing, and deformation adaptability, meeting the long-term needs of underground water and gas transportation.

[0023] 2. In this solution, a multi-component collaborative connection method involving connectors, clamps, ferrules, and rubber fillers achieves secure fixing and reliable sealing between pipes, completely solving the problems of easy detachment and leakage when a narrow-mouthed pipe is inserted into a wide-mouthed pipe in traditional methods. After the connector is embedded into the wide-mouthed end of the pipe, the clamps, with their folding design, form an "internal and external clamping" effect on the wide-mouthed end of the pipe. The ferrule then tightens the connection, ensuring that the diameter of the limiting body formed by the clamps is smaller than the diameter of the wide-mouthed end of the pipe. Even in the event of geological activity, the connector is unlikely to detach from the pipe. The internal components are dislodged; the retaining ring is connected to the connecting body and the flexible pipe, and the constricted end of the pipe and the flexible pipe, respectively, by bolts. Its diameter is adapted to the constricted end and wide end size of the steel frame. When the bolts are tightened, the steel frame and the connecting body are squeezed together and the filling rubber is tightly fitted. The filling rubber can fill the gap between the constricted end of the pipe and the retaining ring. With the rubber's extensibility, it fits tightly to the surface of the pipe. Combined with the sealing effect of the rubber seal, it effectively prevents the conveyed medium from leaking from the connection gap. At the same time, the multiple fixing structures can resist the displacement force caused by geological displacement and ensure the long-term stability of the pipeline connection. Attached Figure Description

[0024] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0025] Figure 1This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the flexible tube of the present invention;

[0027] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0028] Figure 4 This is a cross-sectional view of the overall structure of the present invention;

[0029] Figure 5 This is a schematic diagram of the connector of the present invention;

[0030] Figure 6 for Figure 4 Enlarged view at point B in the middle;

[0031] Figure 7 This is a schematic diagram of the filling rubber of the present invention;

[0032] Figure 8 for Figure 4 Enlarged view at point C;

[0033] Figure 9 for Figure 4 Enlarged view at point D;

[0034] Figure 10 This is a flowchart of the method steps of the present invention.

[0035] Legend: 1. Pipe body; 2. Flexible pipe; 3. Steel frame; 4. Steel wire rope; 5. Rubber seal; 6. Connector; 7. Clip; 8. Hoop; 9. Clamp; 10. Bolt; 11. Filler rubber. Detailed Implementation

[0036] Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention can also be implemented in various different forms, and therefore the present invention is not limited to the embodiments described below. In addition, for the purpose of more clearly describing the present invention, parts not connected to the invention will be omitted from the drawings.

[0037] The technical solution in this application embodiment is to solve the problems mentioned in the background art, and the overall idea is as follows:

[0038] Example:

[0039] Please refer to Figures 1 to 9As shown in the figure, this embodiment introduces a specific structure of a flexible connection structure for a prestressed reinforced concrete pipe, including a pipe body 1 and a flexible pipe 2. The pipe body 1 is a common concrete pipe with a large opening at one end and the other end being consistent with the pipe body. When two adjacent pipe bodies 1 are connected, the installation can be completed by inserting the narrow opening on one side into the large opening at one end of the concrete pipe on the other side. However, this installation method has problems such as unstable installation and easy detachment.

[0040] Therefore, the present invention uses a flexible pipe 2 and auxiliary accessories to connect two adjacent pipe bodies 1, thereby solving problems such as pipe detachment and displacement that may occur during geological activities.

[0041] Please refer to Figure 2 , 3 As shown, the flexible pipe 2 is composed of a steel frame 3, steel wire rope 4, and rubber sealing layer 5. The steel frame 3 serves as the supporting skeleton of the flexible pipe 2. The steel frame 3 has an overall trumpet-shaped design. Prestressed reinforced concrete pipes are mostly used in underground water and gas transmission scenarios, and need to withstand the weight of the soil, ground load, and the internal pressure of the transported medium. If relying solely on the rubber sealing layer 5 or the steel wire rope 4, the flexible pipe is prone to "flattening" due to pressure compression, leading to blockage of the pipe cavity and failure of the transport function. The steel frame 3 provides skeleton-like support for the flexible pipe 2 through its own rigid structure, directly offsetting the external compressive stress, ensuring that the pipe cavity always remains unobstructed, and avoiding damage to the overall connection structure due to deformation.

[0042] The steel wire rope 4 is mainly used as a chain to connect the steel frame 3. Its core function is to resist excessive tension and prevent the flexible pipe 2 from breaking as a whole. Prestressed reinforced concrete pipes are mostly used in underground water conveyance projects and need to withstand the lateral tensile force brought about by geological activities for a long time. That is, adjacent pipes 1 may separate to both sides due to stratum movement, which will then exert continuous tension on the flexible pipe 2 connecting the two. If only the rigid support of the steel frame 3 or the flexible wrapping of the rubber sealing layer 5 are relied upon, the flexible pipe 2 is easy to be pulled apart from the middle due to the tensile force exceeding its own bearing limit, resulting in pipeline failure. With its high strength and high toughness material properties, the steel wire rope 4 forms a tensile skeleton by connecting the steel frame 3. When the flexible pipe is under tension, the steel wire rope 4 directly bears most of the tensile force and transmits the force to the entire steel frame 3 network, avoiding the flexible pipe from breaking due to local tensile overload.

[0043] The rubber seal 5 wraps around the outside of the steel frame 3 and the steel wire rope 4, sealing the steel frame 3 and the steel wire rope 4. The steel frame 3 and the steel wire rope 4 are the core of the flexible pipe's stress, but both are made of metal and are susceptible to corrosion and friction damage in the underground environment. The rubber seal 5 provides long-term protection for both through physical isolation. In addition, when the stratum undergoes slight displacement, the pipe body 1 will cause the flexible pipe 2 to undergo stretching, bending and other deformations. If the rubber seal 5 is made of rigid material, it is easy to crack during the deformation process, which will lead to sealing failure. Because this invention uses rubber material for encapsulation, the high elasticity and high ductility of the rubber can stretch and bend synchronously with the deformation of the flexible pipe 2, and can return to its original shape after deformation. It will not crack due to geological displacement, thus ensuring the deformation capability of the flexible pipe.

[0044] In addition, since the steel frame 3 is designed in a trumpet shape, when the flexible tube 2 is squeezed on both sides, the constricted end retracts into the adjacent wide end, which reduces the radial space occupied and achieves structural volume shrinkage. During construction and use, the flexible tube 2 can be extended by pulling on both sides. Through the telescopic design, when the flexible tube 2 encounters radial external forces such as soil settlement causing the trench to squeeze the pipe, the nested steel frame 3 can move radially within the gap, instead of directly bearing rigid compression. At the same time, the outer rubber sealing layer 5 will undergo elastic deformation due to compression, further absorbing radial force and preventing the steel frame 3 from bending and breaking due to stress concentration.

[0045] Please refer to Figures 4 to 9 As shown, the tube body 1 and the flexible tube 2, as well as the two flexible tubes 2, are connected by auxiliary accessories. The auxiliary accessories include a connector 6 and a retaining ring 9. Multiple retaining strips 7 are rotatably connected to the outside of the connector 6. The diameter of the connector 6 is the same as the diameter of the tube body 1 and can be placed inside the wide end of the tube body 1. The retaining strips 7 are bent, and their bending angle is just in line with the outside of the wide end of the tube body 1. The outer sides of the multiple retaining strips 7 are provided with clamping rings 8. When the connector 6 is placed inside the wide end of the tube body 1, the retaining strips 7 are flipped to form a clamp with the connector 6, and then the retaining rings 8 are used to fix the retaining strips 7 to the outside of the wide end of the tube body 1.

[0046] When the clamping strip 7 is fixed to the outside of the wide end of the pipe body 1 by the clamping ring 8, the diameter of the limiting body composed of multiple clamping strips 7 at the end near the pipe body 1 is smaller than the diameter of the wide end of the pipe body 1. Therefore, when geological activity occurs, the connecting body 6 cannot be easily removed from the inside of the wide end of the pipe body 1.

[0047] A retaining ring 9 is provided on the right side of the connector 6. The retaining ring 9 is used to connect the connector 6 and the flexible tube 2. It is a design of two semi-circular rings rotating together. The open end is fixed by bolts 10, and it is also fixed to the connector 6 by bolts 10. The diameter of the retaining ring 9 is smaller than the diameter of the wide end of the steel frame 3 and larger than the diameter of its narrow end. Therefore, when connecting the connector 6 and the flexible tube 2, the retaining ring 9 is first fixed to the end of the flexible tube 2 near the connector 6, between the first steel frame 3 and the second steel frame 3, and then connected by bolts 10. The connecting body 6 and the retaining ring 9 are connected. By continuously tightening the bolt 10, the retaining ring 9 and the connecting body 6 are brought closer and closer. This causes the wide end of the first steel frame 3 near the connecting body 6 of the flexible tube 2 to be tightly fitted with the side of the connecting body 6 near the retaining ring 9. On the one hand, this connects the flexible tube 2 and the connecting body 6. On the other hand, since the outer side of the flexible tube 2 is wrapped with a rubber sealing layer 5, the continuous pressure of the retaining ring 9 on the end of the flexible tube 2 to be tightly fitted with the connecting body 6 can achieve a sealing effect and prevent leakage of the transported medium.

[0048] Please refer to Figure 7 , 8 As shown, the accessory also includes a filling rubber 11, which is made of solid rubber and is composed of two semicircles. A groove is provided on its outer side, and the inside of the retaining ring 9 engages with the groove on the outer side of the filling rubber 11. In use, the filling rubber 11 is first fixed to the outside of the constricted end of the tube body 1, and then the retaining ring 9 is used to lock it into the groove on the outer side of the filling rubber 11. By locking the retaining ring 9, both the filling rubber 11 and the retaining ring 9 are fixed to the outside of the tube body 1. The filling rubber 11 is used because this connection structure has multiple sets of retaining rings 9, and they are all the same size. However, since the diameter of the constricted end of the tube body 1 is small, the filling rubber 11 is filled between the retaining ring 9 and the tube body 1. On the one hand, it is used to fix the retaining ring 9 to the outside of the tube body 1. On the other hand, the unique extensibility of the filling rubber 11 allows it to fit tightly against the surface of the tube body 1, preventing the conveying medium from leaking between the retaining ring 9 and the tube body 1.

[0049] In addition, when connecting the other end of the flexible tube 2 to the constricted end of the tube body 1, first fix the retaining ring 9 to the end of the flexible tube 2 near the constricted end of the tube body 1, and between the first steel frame 3 and the second steel frame 3 of the flexible tube 2. Then, connect the retaining ring 9 on the outside of the filling rubber 11 and the retaining ring 9 on the outside of the end of the flexible tube 2 with bolts 10. Then, connect the two retaining rings 9 with bolts 10. By continuously tightening the bolts 10, the position between the two retaining rings 9 becomes closer and closer, which in turn squeezes the constricted end of the right steel frame 3 of the flexible tube 2 closer and closer to the filling rubber 11, so that the two are tightly fitted together. On the one hand, it serves to connect the flexible tube 2 and the tube body 1. On the other hand, since the outside of the flexible tube 2 is wrapped with the rubber sealing layer 5, the two retaining rings 9 continuously squeeze the right end of the flexible tube 2 and the filling rubber 11 tightly, which can play a sealing role and prevent the leakage of the transported medium.

[0050] Please refer to Figure 9 As shown, two sets of retaining rings 9 and multiple bolts 10 can also be used to connect two flexible tubes 2. First, the two retaining rings 9 are installed between the first steel frame 3 and the second steel frame 3 at the adjacent ends of the two flexible tubes 2, respectively. Then, the two retaining rings 9 are connected by bolts 10. By continuously tightening the bolts 10, the position between the two retaining rings 9 becomes closer and closer, and then the outer side of the right end steel frame 3 of the left flexible tube 2 is continuously squeezed to fit against the inner side of the left end steel frame 3 of the right flexible tube 2. On the one hand, it serves to connect the two tubes. On the other hand, since the outer side of the flexible tube 2 is wrapped with a rubber sealing layer 5, the continuous squeezing of the outer and inner sides of the two steel frames 3 at the adjacent ends of the two flexible tubes 2 by the two retaining rings 9 can achieve a sealing effect and prevent leakage of the transported medium.

[0051] In summary, as Figure 10 As shown in the figure, this embodiment also introduces a construction method for a flexible connection structure of prestressed reinforced concrete pipes, and the specific steps of the method are as follows:

[0052] S1. On-site measurement and measurement of flexible tube 2:

[0053] The actual distance between the two pipe bodies 1 to be connected is measured on-site using a tape measure. The straight-line distance from the inside of the wide end of pipe body 1 to the outside of the narrow end of the adjacent pipe body 1 is used as the standard, and the measured value is recorded. Considering the expansion and contraction characteristics of the flexible pipe 2, which needs to adapt to the micro-deformation requirements of geological activities, an additional expansion and contraction margin is reserved on the basis of the measured value to avoid insufficient length of the flexible pipe due to spacing errors during subsequent installation, or excessive stretching of the flexible pipe due to geological settlement. Finally, the final cutting length of the flexible pipe 2 is determined.

[0054] S2, Flexible Tube 2 Cutting and End Face Treatment:

[0055] Using specialized cutting tools such as metal cutting pliers and a rubber cutter, cut the flexible tube 2 vertically along the determined cutting line. Note that the cutting line must be selected in the middle of two adjacent steel frames 3 on the flexible tube 2 to avoid exposing the steel frames 3. When cutting, first use the rubber cutter to cut the rubber along the center line to expose the steel wire rope 4, and then use the metal cutting pliers to cut the steel wire rope 4. After cutting, grind the end face of the rubber sealing layer 5 flat to ensure that there are no gaps when it is subsequently bonded to the connector 6 and the filling rubber 11.

[0056] S3. Assembly and fixation of the wide end of pipe body 1 to connector 6:

[0057] Slowly insert the connector 6 into the wide end of the tube 1 until the left end of the connector 6 is tightly fitted with the inner step of the wide end of the tube 1. At this point, the connector 6 does not wobble, completing the initial positioning. Then, flip the multiple retaining strips 7 on the outside of the connector 6. Because the retaining strips 7 are bent, their bending angle is perfectly matched with the outer arc of the wide end of the tube 1. After flipping, the inner side of the bent strips 7 can tightly fit against the outer wall of the wide end of the tube 1, forming a clamping state for the wide end of the tube 1 together with the connector 6, preventing the connector 6 from coming out. Finally, by placing the hoop 8 on the outside of the multiple retaining strips 7 and tightening the hoop 8, its inner side generates uniform radial pressure on the retaining strips 7, forcing the retaining strips 7 to further squeeze the outer wall of the wide end of the tube 1. At the same time, the dispersed retaining strips 7 are integrated into a limiting body. The diameter of the limiting body near the tube body is smaller than the diameter of the wide end of the tube 1, completely preventing the connector 6 from coming out of the wide end of the tube 1, thus completing the fixation of the two.

[0058] S4. Connection and fixing of connector 6 and flexible tube 2:

[0059] Take a retaining ring 9, open its open end, and place it between the first steel frame 3 and the second steel frame 3 near the end of the flexible tube 2 closest to the connector 6. Because the diameter of the retaining ring 9 is smaller than the diameter of the wide end of the steel frame 3 but larger than the diameter of the narrow end, it can be tightly locked between the two steel frames 3 without axial sliding. Move the flexible tube 2 with the retaining ring 9 to the right side of the connector 6, so that the wide end of the steel frame 3 on the left side of the flexible tube 2 is aligned with the right end of the connector 6. Tighten the open end of the retaining ring 9 with bolt 10, and at the same time, pass bolt 10 through the connector 6. The pre-drilled hole on the right side corresponds to the hole of the retaining ring 9, achieving initial connection between the two. The bolts 10 between the connecting body 6 and the retaining ring 9 are continuously tightened with a wrench or other equipment. As the bolts 10 are tightened, the distance between the retaining ring 9 and the connecting body 6 gradually decreases. The retaining ring 9 will squeeze the wide end of the steel frame 3 on the left side of the flexible tube 2, making it fit tightly against the right end of the connecting body 6. At the same time, the rubber sealing layer 5 on the outside of the flexible tube 2 undergoes slight deformation due to compression, filling the gap between the connecting body 6 and the steel frame 3, achieving a seal and preventing leakage of the conveyed medium.

[0060] S5. Assembly of the constricted end of tube body 1 with filler rubber 11 and retaining ring 9:

[0061] Take two sets of semi-circular filling rubber 11 and splice them to wrap around the outer wall of the constricted end of the pipe body 1, ensuring that the filling rubber 11 fits tightly with the constricted end of the pipe body 1 without any obvious gaps. Take another retaining ring 9, open the open end and put it on the outside of the filling rubber 11, so that the inside of the retaining ring 9 precisely engages with the retaining groove on the outside of the filling rubber 11. Close the open end of the retaining ring 9 and lock the open end with the bolt 10. At this time, the retaining ring 9 is fixed to the outside of the constricted end of the pipe body 1 by the support of the filling rubber 11. The extensibility of the filling rubber 11 can further fit the surface of the pipe body 1, preventing subsequent media from leaking from between the retaining ring 9 and the pipe body 1.

[0062] S6. The other end of the flexible tube 2 is fixed to the constricted end of the tube body 1:

[0063] Take another retaining ring 9 and place it between the first steel frame 3 and the second steel frame 3 on the right end of the flexible tube 2, and lock the open end of the retaining ring 9 with bolt 10; move the right end of the flexible tube 2 to the side of the retaining ring 9 on the outside of the constricted end of the tube body 1, so that the retaining ring 9 on the right end of the flexible tube 2 is aligned with the retaining ring 9 on the constricted end of the tube body 1; pass a long bolt 10 through the corresponding reserved holes of the two retaining rings 9, and gradually tighten the bolt 10 between the two retaining rings 9. As the bolt 10 is tightened, the distance between the two retaining rings 9 decreases, which will squeeze the constricted end of the steel frame 3 on the right end of the flexible tube 2, so that it fits tightly against the left side of the filling rubber 11; at the same time, the rubber sealing layer 5 on the right end of the flexible tube 2 deforms due to compression, filling the gap between the steel frame 3 and the filling rubber 11, achieving a seal, and thus achieving a complete connection of the tube body 1, the flexible tube 2, and the tube body 1;

[0064] S7. Connection and fixing between the two flexible pipes 2. This step mainly addresses how to extend the pipeline by connecting two flexible pipes 2 when the pipeline length is insufficient.

[0065] At each of the adjacent ends of the two flexible tubes 2 to be connected, a retaining ring 9 is fitted, and both are placed between the first steel frame 3 and the second steel frame 3 at the end. Then, the open ends of the two retaining rings 9 are locked with bolts 10. Next, the adjacent ends of the two flexible tubes 2 are aligned, so that the constricted end of the steel frame 3 at the right end of the left flexible tube is aligned with the wide end of the steel frame 3 at the left end of the right flexible tube. Bolts 10 are inserted through the retaining rings 9 at the ends of the two flexible tubes, and the bolts 10 between the two retaining rings 9 are gradually tightened. As the bolts 10 are tightened, the distance between the two retaining rings 9 decreases, which will squeeze the outer side of the right end steel frame 3 of the left flexible tube and the inner side of the left end steel frame 3 of the right flexible tube, so that they fit tightly. At the same time, the rubber sealing layer 5 of the two flexible tubes fills the gap due to the compression deformation, so as to achieve connection and sealing.

[0066] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A flexible joint structure for prestressed concrete pipes, comprising a pipe body (1), a flexible pipe (2) and an accessory fitting; characterized in that, The flexible tube (2) is composed of a steel frame (3), a steel wire rope (4) and a rubber seal (5). The steel frame (3) is designed in a trumpet shape. The diameter of the wide end of the steel frame (3) is larger than the diameter of the narrow end. The steel wire rope (4) connects the steel frame (3) to form a tensile structure. The rubber seal (5) is wrapped around the outside of the steel frame (3) and the steel wire rope (4).

2. A flexible joint for a pre-stressed reinforced concrete pipe as defined in claim 1, characterized in that The accessory includes a connector (6) and a retaining ring (9). Multiple retaining strips (7) are rotatably connected to the outside of the connector (6). A hoop (8) is fitted on the outside of the retaining strips (7). A retaining ring (9) is provided on the right side of the connector (6) and is connected to the connector (6) by a bolt (10).

3. A flexible joint for a pre-stressed reinforced concrete pipe as defined in claim 1, wherein The accessory also includes a filling rubber (11), which is set on the outside of the constricted end of the tube body (1). The filling rubber (11) is a structure of two semi-circular bodies spliced ​​together and has a groove on the outside. The inner side of the retaining ring (9) can engage with the groove on the outside of the filling rubber (11).

4. A flexible joint for a pre-stressed reinforced concrete pipe as defined in claim 1, wherein The retaining ring (9) is a rotating connection structure of two semi-circular rings and its open end is locked by bolts (10). The two adjacent retaining rings (9) are connected by bolts (10).

5. A flexible joint for a pre-stressed reinforced concrete pipe as defined in claim 1, wherein The inner and outer sides of the steel frame (3) at opposite ends of the two adjacent flexible tubes (2) are in contact.

6. A construction method for a flexible connection structure of a prestressed reinforced concrete pipe applied to any one of the connection structures described in claims 1 to 5, characterized in that, The method includes the following steps: S1: Measure the distance between the two pipe bodies (1) to be connected on site. Take the straight distance from the inside of the wide end of the pipe body (1) to the outside of the narrow end of the adjacent pipe body (1) as the benchmark, and determine the cutting length of the flexible pipe (2) after reserving the expansion and contraction allowance. S2: Use special tools to cut the flexible tube (2), avoiding the steel frame (3) at the cutting position. First cut the rubber sealing layer (5) and then cut the steel wire rope (4). Grind the cut end face of the flexible tube (2) until it is flat. S3: Insert the connector (6) into the inside of the wide end of the pipe (1), flip the clip (7) so that it fits the outside of the wide end of the pipe (1), put on the hoop (8) and tighten it to fix the connector (6) and the pipe (1). S4: Place the retaining ring (9) between the steel frame (3) at one end of the flexible tube (2), move the flexible tube (2) so that the wide end of the steel frame (3) is aligned with the connector (6), connect the retaining ring (9) and the connector (6) with bolts (10) and lock them so that the steel frame (3) and the connector (6) fit tightly together; S5: The filling rubber (11) is spliced ​​and wrapped around the outside of the constricted end of the tube body (1), and a retaining ring (9) is fitted and engaged with the groove of the filling rubber (11). The retaining ring (9) is fixed with bolts (10). S6: A retaining ring (9) is fitted on the other end of the flexible tube (2), and the retaining ring (9) is connected to the retaining ring (9) at the constricted end of the tube body (1) with a bolt (10) and locked, so that the constricted end of the flexible tube (2) steel frame (3) is tightly fitted with the filling rubber (11), and the connection of the tube body (1), flexible tube (2) and tube body (1) is completed; S7: Fit the retaining rings (9) onto the adjacent ends of the two flexible pipes (2) to be connected, so that the steel frames (3) of the two flexible pipes (2) are nested. Connect the two retaining rings (9) with bolts (10) and lock them, so that the adjacent steel frames (3) fit tightly together and the pipe is extended.

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