A protective device for a corrosion protection coating of a prestressed concrete pipe

Abstract

The present application relates to the field of reinforced concrete pipe, disclose a kind of anticorrosive coating protection device of prestressed reinforced concrete pipe, with sleeve pipe fittings, connecting sleeve, buffer support, pipe connection structure, sealing element, buffer support sleeve pipe fittings, reinforced concrete pipe is lifted, and forms buffer effect to the reinforced concrete pipe in motion state, the sleeve pipe fittings between the end of adjacent reinforced concrete pipe mutual approach is installed and connected by pipe connection structure, sealing element and pipe connection structure are closely docked, to seal the junction between sleeve pipe fittings and pipe connection structure.The present application, pipe connection structure is arranged between reinforced concrete pipe, adjacent reinforced concrete pipe between will not be influenced by the peeling of anticorrosive coating in certain reinforced concrete pipe, realize the independent motion isolation of adjacent reinforced concrete pipe, avoid the vibration conduction between reinforced concrete pipe, realize the protection to anticorrosive coating.

Description

Technical Field

[0001] This invention relates to the field of reinforced concrete pipe protection technology, specifically to a protective device for the anti-corrosion coating of prestressed reinforced concrete pipes. Background Technology

[0002] Reinforced concrete pipes are made of concrete and steel bars and are used to transport fluids such as water, oil, and gas. They are widely used in the field of water conservancy and hydropower. In order to improve the service life and waterproof strength of reinforced concrete pipes, an anti-corrosion coating is usually applied to the inner wall of the reinforced concrete to enhance its waterproof strength. Due to the relatively simple structure of reinforced concrete pipes, the cushioning effect of the reinforced concrete pipes is poor when they are hoisted and placed by cranes, which can easily cause damage to the reinforced concrete pipes. This can affect the integrity of the anti-corrosion coating on the inner wall of the concrete pipe and affect the normal use of the concrete pipe.

[0003] To address the issue of coating damage during transportation and installation, existing technologies typically involve placing a buffer at the bottom of the reinforced concrete pipe to prevent the coating from cracking due to impacts during transport and installation.

[0004] Besides the potential damage to the anti-corrosion coating during transportation and installation, damage can also occur during the use of reinforced concrete pipes. For example, after the reinforced concrete pipes are assembled and connected, they may vibrate during use due to factors such as fluid impact and load changes. On the one hand, if the anti-corrosion coating peels off locally due to vibration, the peeled area will form a stress concentration point, accelerating the cracking and peeling off of the anti-corrosion coating of the surrounding reinforced concrete pipes. This coating damage may spread along the socket of the pipe connection to adjacent pipe sections. On the other hand, the vibration will be transmitted along the pipe connection to adjacent pipe sections, accelerating the peeling off of the coating in adjacent pipe sections. Summary of the Invention

[0005] To address this, the present invention provides a protective device for the anti-corrosion coating of prestressed reinforced concrete pipes, which effectively solves the technical problems in the prior art where vibration of a certain area of ​​reinforced concrete pipes accelerates the cracking and peeling of the anti-corrosion coating of surrounding reinforced concrete pipes, and vibration is transmitted along the pipe connection to adjacent pipe sections, accelerating the peeling of the coating in adjacent pipe sections.

[0006] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution: a protective device for the anti-corrosion coating of prestressed reinforced concrete pipes, comprising:

[0007] Fittings are installed at the ends of reinforced concrete pipes.

[0008] A connecting sleeve is used to fix the fitting to the reinforced concrete pipe.

[0009] A buffer support is installed on the outer periphery of the sleeve fitting. The buffer support raises the sleeve fitting and the reinforced concrete pipe and provides a buffering effect for the reinforced concrete pipe in motion.

[0010] The pipe connection structure is installed between two adjacent reinforced concrete pipes. The sleeve fittings at the close ends of the adjacent reinforced concrete pipes are connected by the pipe connection structure, and the adjacent reinforced concrete pipes are connected by the sleeve fittings and the pipe connection structure.

[0011] A sealing element is disposed on the end of the sleeve fitting away from the reinforced concrete pipe and is tightly mated with the inter-pipe connection structure to seal the connection between the sleeve fitting and the inter-pipe connection structure.

[0012] The pipe connection structure is formed by the movable connection of a main pipe body and sub-pipe body components. The fittings located at both ends of the pipe connection structure are all connected to the sub-pipe body components. The main pipe body and the sub-pipe body components are movably connected, and the sub-pipe body components and the fittings are movably connected, so that the fittings can move relative to the sub-pipe body components or the main pipe body along the length direction, diameter direction, and circumferential direction of the pipe connection structure, so that the main pipe body does not move synchronously when one of the fittings moves.

[0013] Furthermore, the fitting includes an inner tube body and an outer tube body fitted over the inner tube body;

[0014] The outer wall of the inner tube is provided with a limiting protrusion, and the inner wall of the outer tube is provided with a limiting groove. The side wall of the limiting protrusion fits into the inner wall of the limiting groove, and the limiting protrusion is slidably disposed in the limiting groove.

[0015] The length of the outer tube is less than the length of the inner tube. One end of the inner tube is provided with a first limiting plate, and the outer wall of the other end is provided with a limiting protrusion. The outer tube is movably disposed between the first limiting plate and the limiting protrusion.

[0016] The first limiting plate is connected to an annular abutment platform, and the abutment platform is connected to an annular docking cone.

[0017] Furthermore, the sealing element includes a second limiting plate disposed at the end of the inner tube body near the first limiting plate, and a connecting spring disposed between the first limiting plate and the second limiting plate;

[0018] The connecting spring is wrapped around the outside of the inner tube, with one end connected to the first limiting plate and the other end connected to the second limiting plate;

[0019] A sealing sleeve is connected between the first limiting plate and the second limiting plate, and an air cavity is formed between the sealing sleeve and the outer wall of the inner tube. The connecting spring is placed in the air cavity.

[0020] Furthermore, several of the aforementioned buffer supports are mounted in a circumferential array on the outer wall of the outer tube.

[0021] The buffer support includes a first bearing and a second bearing disposed on the outer wall of the outer tube.

[0022] A rotating rod is rotatably connected to the first bearing via a first rotating shaft, and a roller is rotatably connected to the end of the rotating rod via a second rotating shaft;

[0023] An outer sleeve is rotatably connected to the middle position of the rotating rod via a third rotating shaft. An inner sleeve is movably disposed inside the outer sleeve. A buffer spring is connected between the outer sleeve and the inner sleeve. The buffer spring is disposed inside the outer sleeve. The end of the inner sleeve extends out of the outer sleeve. A fourth rotating shaft is installed at the end of the inner sleeve and is rotatably mounted on the second shaft seat via the fourth rotating shaft.

[0024] Furthermore, the sub-tube component includes a first sub-tube symmetrically disposed within both ends of the main tube and a second sub-tube sleeved outside the ends of the first sub-tube;

[0025] The inner tube body is connected to the second sub-tube body at its end. The inner wall of the main tube body is provided with a first movable groove along its own length direction. The outer wall of the first sub-tube body is provided with a first movable bolt. The first movable bolt is slidably disposed in the first movable groove. The first sub-tube body is slidably disposed in the main tube body through the first movable bolt.

[0026] A buffer sleeve is provided at the end of the first sub-tube that is away from the second sub-tube.

[0027] Furthermore, a second movable bolt is provided at the outer end of the first sub-tube body, and a second movable groove is provided on the inner side wall of the second sub-tube body along its own circumferential direction. The second movable bolt is slidably disposed inside the second movable groove, and the second sub-tube body is slidably disposed outside the first sub-tube body through the second movable bolt.

[0028] Furthermore, the inner wall of the end of the second sub-tube is provided with a first ring seat and a second ring seat in sequence;

[0029] The first ring seat is for the docking cone to pass through and for the abutting platform to abut against. The inner diameter of the first ring seat is larger than the outer diameter of the docking cone and smaller than the outer diameter of the abutting platform. The outer diameter of the abutting platform is smaller than the inner diameter of the second sub-tube body, so as to form a first movable gap between the abutting platform and the inner wall of the second sub-tube body.

[0030] The outer diameter of the abutting platform is larger than the outer diameter of the first limiting plate, the inner diameter of the second ring seat is larger than the outer diameter of the abutting platform, and a sealing groove is provided on the side of the second ring seat away from the first ring seat for the sealing sleeve to fit tightly against the outer wall.

[0031] A second movable gap is formed between the sealing sleeve and the inner wall of the second sub-tube.

[0032] Furthermore, two limiting blocks are symmetrically arranged on the inner wall of the end of the second sub-tube, and a limiting ring seat is provided on the outer wall of the outer tube. A support ring plate is connected to the outer periphery of the limiting ring seat, and the support ring plate is provided with a through groove for the limiting blocks to pass through.

[0033] The outer diameter of the support ring plate is greater than the distance between the two limiting blocks and less than the inner diameter of the second sub-tube body, so as to form a third movable gap between the support ring plate and the second sub-tube body;

[0034] When the fitting is connected to the second sub-pipe, the abutting platform abuts against the first ring seat, the supporting ring plate abuts against the limiting block, and at least part of the outer wall of the sealing sleeve is tightly fitted into the sealing groove.

[0035] Furthermore, a third sub-tube is connected to the outer end of the first sub-tube, and the second sub-tube is disposed inside the third sub-tube, wherein the inner diameter of the third sub-tube is larger than the outer diameter of the second sub-tube;

[0036] The roller is supported on the inner wall of the third sub-tube.

[0037] Furthermore, both the reinforced concrete pipe and the fitting are provided with protruding pipe heads at their ends, and the outer diameter of the protruding pipe heads is larger than the outer diameter of the reinforced concrete pipe and the fitting.

[0038] The outer wall of the connecting sleeve forms a protruding receiving wall, and the receiving wall is provided with a socket for the protruding tube head to be installed and embedded.

[0039] The end of the connecting sleeve is installed on the inner wall of the reinforced concrete pipe and the fitting.

[0040] Compared with the prior art, the present invention has the following advantages:

[0041] In this invention, a sleeve fitting is placed at the end of a reinforced concrete pipe, and a buffer support is provided outside the sleeve fitting. The buffer support can raise the reinforced concrete pipe to a certain height and provide a buffer when the reinforced concrete pipe shakes during transportation and installation, thus protecting the reinforced concrete pipe and avoiding damage to the anti-corrosion coating due to impact caused by improper protection.

[0042] By setting up inter-pipe connection structures between reinforced concrete pipes, and using these structures as connectors between the pipes, stress concentration points are avoided. Adjacent reinforced concrete pipes are not affected by the peeling of the anti-corrosion coating in one pipe, thus achieving independent movement and isolation of adjacent pipes and protecting the anti-corrosion coating.

[0043] When one or more reinforced concrete pipes vibrate, they will move relative to the sub-pipe components or the main pipe, while the main pipe will not move accordingly. This avoids the transmission of vibration between the reinforced concrete pipes, thereby preventing the anti-corrosion coating inside the reinforced concrete pipe from being accelerated to peel off due to the vibration of adjacent reinforced concrete pipes, and further achieving the protection of the anti-corrosion coating. Attached Figure Description

[0044] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0045] Figure 1 A three-dimensional structural schematic diagram of a protective device for anti-corrosion coating of prestressed reinforced concrete pipe provided in an embodiment of the present invention;

[0046] Figure 2 A top view of a protective device for a prestressed reinforced concrete pipe anti-corrosion coating, provided in an embodiment of the present invention;

[0047] Figure 3 for Figure 2 A planar sectional view along the AA direction;

[0048] Figure 4 for Figure 2 A three-dimensional sectional view along the AA direction;

[0049] Figure 5 This is a schematic diagram of the structure in which the reinforced concrete pipe and the sleeve fitting are connected as one unit in an embodiment of the present invention;

[0050] Figure 6 for Figure 5A top-view structural diagram;

[0051] Figure 7 for Figure 6 A three-dimensional sectional view along the BB direction;

[0052] Figure 8 for Figure 3 Enlarged structural diagram of the first sub-tube body, the second sub-tube body, the third sub-tube body, and the fittings;

[0053] Figure 9 for Figure 8 Enlarged structural diagram of the second sub-tube body and fittings;

[0054] Figure 10 for Figure 5 Enlarged structural diagram of the intermediate sleeve fitting and buffer support;

[0055] Figure 11 This is a three-dimensional structural diagram of the pipe connection structure in an embodiment of the present invention;

[0056] Figure 12 This is a top view of the pipe connection structure in an embodiment of the present invention;

[0057] Figure 13 for Figure 12 A three-dimensional sectional view along the CC direction;

[0058] Figure 14 This is a schematic diagram of the structure of the first sub-tube and the third sub-tube in an embodiment of the present invention;

[0059] Figure 15 for Figure 8 A magnified structural diagram of point A in the middle.

[0060] The labels in the diagram represent the following:

[0061] 1. Reinforced concrete pipe; 2. Connecting sleeve; 3. Fitting fitting; 4. Buffer support; 5. Pipe connection structure; 6. Sealing element; 7. Protruding pipe head; 8. Socket wall; 9. Socket joint;

[0062] 31. Inner tube body; 32. Outer tube body; 33. Limiting protrusion; 34. Limiting groove; 35. First limiting plate; 36. Limiting protrusion wall; 37. Abutting platform; 38. Connecting cone; 39. Limiting ring seat; 310. Supporting ring plate; 311. Through groove;

[0063] 41. First bearing seat; 42. Second bearing seat; 43. First rotating shaft; 44. Outer sleeve; 45. Inner sleeve; 46. Buffer spring; 47. Fourth rotating shaft; 48. Rotating rod; 49. Roller;

[0064] 51. Main tube; 52. Sub-tube components;

[0065] 61. Second limiting plate; 62. Connecting spring; 63. Sealing sleeve; 64. Air chamber;

[0066] 521. First sub-tube body; 522. Second sub-tube body; 523. Third sub-tube body; 524. First movable groove; 525. First movable bolt; 526. Buffer sleeve; 527. Second movable bolt; 528. Second movable groove; 529. First ring seat; 5210. Second ring seat; 5211. First movable gap; 5212. Sealing groove; 5213. Second movable gap; 5214. Limiting block; 5215. Third movable gap. Detailed Implementation

[0067] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0068] like Figures 1-15 As shown, the present invention provides a protective device for the anti-corrosion coating of prestressed reinforced concrete pipes, comprising a fitting 3, a connecting sleeve 2, a buffer support 4, an inter-pipe connection structure 5, and a sealing element 6. The fitting 3 is used to be installed at the end of the reinforced concrete pipe 1 before transportation and installation to protect the reinforced concrete pipe 1 during transportation and installation. The inter-pipe connection structure 5 is assembled between adjacent reinforced concrete pipes 1 during installation to protect the reinforced concrete pipe 1 during use.

[0069] The fitting 3 is installed at the end of the reinforced concrete pipe 1. Generally, it is installed at the end of the reinforced concrete pipe 1 after the reinforced concrete pipe 1 is manufactured and before transportation. The fitting 3 is fixedly connected to the reinforced concrete pipe 1 through the connecting sleeve 2.

[0070] The buffer support 4 is installed on the outer periphery of the sleeve fitting 3. The buffer support 4 raises the sleeve fitting 3 and the reinforced concrete pipe 1 and provides a buffering effect for the reinforced concrete pipe 1 in motion.

[0071] In this invention, the sleeve fitting 3 is set at the end of the reinforced concrete pipe 1, and a buffer support 4 is set outside the sleeve fitting. The buffer support 4 can raise the reinforced concrete pipe 1 to a certain height and provide a buffer when the reinforced concrete pipe 1 shakes during transportation and installation, thus protecting the reinforced concrete pipe 1 and avoiding damage to the anti-corrosion coating due to impact caused by improper protection. This achieves the protection of the anti-corrosion coating.

[0072] The pipe connection structure 5 is installed between two adjacent reinforced concrete pipes 1. The fittings 3 at the close ends of the adjacent reinforced concrete pipes 1 are connected by the pipe connection structure 5. The adjacent reinforced concrete pipes 1 are connected by the fittings 3 and the pipe connection structure 5. The connection between the adjacent reinforced concrete pipes 1 not only achieves the connection, but also ensures the connection effect.

[0073] A pipe connection structure 5 is set between the reinforced concrete pipes 1. The pipe connection structure 5 serves as the connector between the reinforced concrete pipes 1 to avoid stress concentration points. The adjacent reinforced concrete pipes 1 will not be affected by the peeling of the anti-corrosion coating in one of the reinforced concrete pipes 1, so as to realize the independent movement and isolation of the adjacent reinforced concrete pipes, thereby protecting the anti-corrosion coating.

[0074] The sealing element 6 is located on the end of the sleeve fitting 3 away from the reinforced concrete pipe 1 and is tightly connected to the inter-pipe connection structure 5 to seal the connection between the sleeve fitting 3 and the inter-pipe connection structure 5.

[0075] The sleeve fitting 3 is fixedly connected to the reinforced concrete pipe 1. Therefore, the sleeve fitting 3 will move together with the reinforced concrete pipe 1. That is, the movement state of the sleeve fitting 3 and the reinforced concrete pipe 1 is consistent. If the reinforced concrete pipe 1 vibrates, the sleeve fitting 3 will also vibrate accordingly. When the sleeve fitting 3 moves, the sealing element 6 can also ensure the sealing state between the sleeve fitting 3 and the pipe connection structure 5.

[0076] Among them, such as Figure 3 As shown, the inter-pipe connection structure 5 is formed by the movable connection of the main pipe body 51 and the sub-pipe body component 52. The sleeve pipe fittings 3 located at both ends of the inter-pipe connection structure 5 are all connected to the sub-pipe body component 52. The main pipe body 51 and the sub-pipe body component 52 are movably connected, and the sub-pipe body component 52 and the sleeve pipe fitting 3 are movably connected, so that the sleeve pipe fitting 3 can move relative to the sub-pipe body component 52 or the main pipe body 51 along the length direction, diameter direction and circumference direction of the inter-pipe connection structure 5, so that the main pipe body 51 does not move synchronously when one of the sleeve pipe fittings 3 moves.

[0077] When one or more reinforced concrete pipes 1 vibrate, the reinforced concrete pipe 1 will move relative to the sub-pipe component 52 or the main pipe 51. That is, when a certain reinforced concrete pipe 1 vibrates and moves, the main pipe 51 between adjacent reinforced concrete pipes 1 will not move accordingly, thus avoiding the transmission of vibration between the reinforced concrete pipes 1. This prevents the anti-corrosion coating inside the reinforced concrete pipe 1 from being accelerated to peel off due to the vibration of adjacent reinforced concrete pipes 1, and further achieves the protection of the anti-corrosion coating.

[0078] The connecting sleeve 2 is used to connect the reinforced concrete pipe 1 and the fitting 3 to ensure a secure connection between them. Specifically, for example... Figure 15 As shown, both the reinforced concrete pipe 1 and the fitting 3 have a protruding pipe head 7 at their ends. The outer diameter of the protruding pipe head 7 is larger than the outer diameter of the reinforced concrete pipe 1 and the fitting 3, and the inner diameter of the protruding pipe head 7 is also larger than the inner diameter of the reinforced concrete pipe 1 and the fitting 3. The outer wall of the connecting sleeve 2 forms a receiving wall 8 corresponding to the protrusion of the protruding pipe head 7. The receiving wall 8 has a socket 9 for the protruding pipe head 7 to be installed and embedded. The end of the connecting sleeve 2 is installed on the inner wall of the reinforced concrete pipe 1 and the fitting 3, and the outer wall of the end of the connecting sleeve 2 is tightly attached to the inner wall of the reinforced concrete pipe 1 and the fitting 3.

[0079] When transporting goods between the reinforced concrete pipe 1 and the fitting 3, the goods will hardly leak out between the reinforced concrete pipe 1 and the connecting sleeve 2. If there is a small amount of leakage, the tight design at the convex pipe head 7 and the socket 9 will further prevent the liquid from overflowing.

[0080] The fitting 3 is fixedly connected to both ends of the reinforced concrete pipe 1 via the connecting sleeve 2. The fitting 3 is used to connect with the reinforced concrete pipe 1, providing an intermediate structure for the buffer support 4 to apply a buffering effect. In addition, it provides an intermediate structure for the inter-pipe connection structure 5, avoiding the inconvenience of sealing when the inter-pipe connection structure 5 is directly connected to the reinforced concrete pipe 1. Specifically, for example... Figure 6 , Figure 7 , Figure 8 , Figure 9 As shown, the fitting 3 includes an inner tube body 31 and an outer tube body 32 that is movably fitted outside the inner tube body 31.

[0081] After installation, the inner pipe body 31 and the outer pipe body 32 move synchronously with the reinforced concrete pipe 1. Although the inner pipe body 31 and the outer pipe body 32 are movably connected, the movable connection is for the convenience of installing the sealing element 6 and the installation between the fitting 3 and the pipe connection structure 5.

[0082] The outer tube 32 can move relative to the inner tube 31 along the length direction of the inner tube 31 (but cannot move relative to it in other directions). To achieve this, the following design is made: a limiting protrusion 33 is provided on the outer wall of the inner tube 31, and a limiting groove 34 is provided on the inner wall of the outer tube 32. The side wall of the limiting protrusion 33 fits into the inner wall of the limiting groove 34. The limiting protrusion 33 is slidably disposed in the limiting groove 34, and the outer tube 32 moves relative to the inner tube 31 along the length direction of the inner tube 31 through the limiting protrusion 33.

[0083] The length of the outer tube 32 is less than the length of the inner tube 31. One end of the inner tube 31 is provided with a first limiting plate 35, and the outer wall of the other end is provided with a limiting protrusion 36. The outer tube 32 is movably disposed between the first limiting plate 35 and the limiting protrusion 36. The first limiting plate 35 and the limiting protrusion 36 restrict the range of motion of the outer tube 32.

[0084] A ring-shaped abutment platform 37 is connected to the first limiting plate 35, and a ring-shaped docking cone 38 is connected to the abutment platform 37. Both the abutment platform 37 and the docking cone 38 are structures used to connect the pipe connection structure 5.

[0085] The sealing element 6 is installed at the end of the sleeve fitting 3. The sealing element 6 is tightly mated with the inter-pipe connection structure 5 to seal the connection between the sleeve fitting 3 and the inter-pipe connection structure 5. Specifically, as shown... Figure 8 , Figure 9 As shown, the sealing element 6 includes a second limiting plate 61 disposed at the end of the inner tube 31 near the first limiting plate 35, and a connecting spring 62 disposed between the first limiting plate 35 and the second limiting plate 61.

[0086] The connecting spring 62 surrounds the outside of the inner tube 31, with one end connected to the first limiting plate 35 and the other end connected to the second limiting plate 61. The connecting spring 62 can apply elastic force when the distance between the first limiting plate 35 and the second limiting plate 61 is less than a certain value.

[0087] A sealing sleeve 63 is connected between the first limiting plate 35 and the second limiting plate 61. An air cavity 64 is formed between the sealing sleeve 63 and the outer wall of the inner tube 31. A connecting spring 62 is placed in the air cavity 64.

[0088] The sealing sleeve 63 is made of rubber material (such as nitrile rubber NBR, natural rubber, etc.). The sealing sleeve 63 can deform when the first limiting plate 35 and the second limiting plate 61 move relative to each other. The volume of the air cavity 64 is fixed. The air cavity 64 is filled with gas to keep the sealing sleeve 63 in an outward expansion state. The sealing sleeve 63 is the main component for achieving the seal between the fitting 3 and the inter-pipe connection structure 5.

[0089] The buffer support 4 is installed on the outer periphery of the sleeve fitting 3. The buffer support 4 raises the sleeve fitting 3 and the reinforced concrete pipe 1, and provides a buffering effect for the reinforced concrete pipe 1 in motion. Specifically, as shown in the figure... Figure 5 , Figure 9 and Figure 10 As shown, several buffer support members 4 are installed in a circumferential array on the outer wall of the outer tube 32;

[0090] The buffer support 4 includes a first bearing 41 and a second bearing 42 disposed on the outer wall of the outer tube 32;

[0091] A rotating rod 48 is rotatably connected to the first bearing 41 via a first rotating shaft 43, and a roller 49 is rotatably connected to the end of the rotating rod 48 via a second rotating shaft.

[0092] An outer sleeve 44 is rotatably connected to the middle position of the rotating rod 48 via a third rotating shaft. An inner sleeve 45 is movably disposed within the outer sleeve 44. A buffer spring 46 connects the outer sleeve 44 and the inner sleeve 45, and the buffer spring 46 is located inside the outer sleeve 44. The end of the inner sleeve 45 extends out of the outer sleeve 44, and a fourth rotating shaft 47 is mounted on the end of the inner sleeve 45, rotatably mounted on the second bearing seat 42 via the fourth rotating shaft 47.

[0093] When the fitting 3 is fixedly connected to both ends of the reinforced concrete pipe 1, and the reinforced concrete pipe 1 needs to be transported, the reinforced concrete pipe 1 is placed on the transport vehicle. The roller 49 will be placed on the surface of the transport vehicle first. Under the gravity of the reinforced concrete pipe 1, the rotating rod 48 will rotate inward at a certain angle. At this time, the buffer spring 46 is in a compressed state. If there is a bump during the transportation process, the buffer spring 46 applies a buffering force to the outer sleeve 44, so that the rotating rod 48 rotates slowly. The reinforced concrete pipe 1 may have a small up-and-down sway, but it will not bump synchronously with the transport vehicle, thereby avoiding collision with the transport vehicle.

[0094] When the reinforced concrete pipe 1 needs to be installed, the roller 49 will be placed on a certain surface first. Under the gravity of the reinforced concrete pipe 1, the rotating rod 48 will rotate inward at a certain angle. The buffer spring 46 applies a buffering force to the outer sleeve 44, so that the rotating rod 48 rotates slowly in this process, and the reinforced concrete pipe 1 is gradually placed on the pipe seat.

[0095] Pipe supports are generally at a certain height, and buffer support 4 may not be able to contact the ground to be installed. In order to make buffer support 4 contact a certain surface to produce a buffering effect when the reinforced concrete pipe 1 is installed, a support can be set in the area to be installed. The support reaches a certain height, so that during the installation process, the roller 49 first contacts the surface of the support, and then the reinforced concrete pipe 1 slowly descends under the buffering effect, gradually contacting and being placed into the pipe support.

[0096] In this invention, the sleeve fittings 3 located at both ends of the pipe connection structure 5 are all connected to the sub-pipe body component 52. The main body 51 and the sub-pipe body component 52 are movably connected, and the sub-pipe body component 52 and the sleeve fittings 3 are movably connected, so that the sleeve fittings 3 can move relative to the sub-pipe body component 52 or the main body 51 along the length direction, diameter direction and circumferential direction of the pipe connection structure 5. That is to say, when one of the sleeve fittings 3 moves with the reinforced concrete pipe 1, it may drive the sub-pipe body component 52 to move, but it will never drive the main body 51 to move. Therefore, the design of the main body 51 and the sub-pipe body component 52 realizes vibration transmission isolation.

[0097] Specifically, such as Figure 4 , Figures 11-14 As shown, the sub-tube component 52 includes a first sub-tube 521 symmetrically arranged at both ends of the main tube 51, and a second sub-tube 522 sleeved outside the ends of the first sub-tube 521. The end of the inner tube 31 is connected to the second sub-tube 522. The inner wall of the main tube 51 is provided with a first movable groove 524 along its own length direction. The outer wall of the first sub-tube 521 is provided with a first movable bolt 525. The first movable bolt 525 is slidably arranged in the first movable groove 524. The first sub-tube 521 is slidably arranged in the main tube 51 through the first movable bolt 525.

[0098] The above design is to avoid the motion-related impact on adjacent reinforced concrete pipes 1 when horizontal vibration or other movements occur in reinforced concrete pipe 1.

[0099] Assuming there are adjacent nth reinforced concrete pipe 1 and n+1th reinforced concrete pipe 1, when the n+1th reinforced concrete pipe 1 moves laterally, it will cause the sleeve fitting 3 to move laterally, thereby causing the second sub-pipe body 522 and the first sub-pipe body 521 to move laterally. When the first sub-pipe body 521 moves laterally, it will slide within the main pipe body 51 through the first movable bolt 525. The main pipe body 51 will not move laterally with the first sub-pipe body 521, thus achieving vibration transmission isolation in the horizontal direction.

[0100] In practical applications, horizontal vibration may be caused by low-frequency excitation of the vibrating equipment, and the inertial force of the equipment movement may be transmitted to the reinforced concrete pipe 1, causing the reinforced concrete pipe 1 to resonate in the horizontal direction. Therefore, the design of the first movable bolt 525 between the first sub-pipe body 521 and the main body 51 in this invention effectively prevents the above-mentioned horizontal resonance of the reinforced concrete pipe 1.

[0101] Within the main tube 51, the adjacent ends of the first sub-tube 521 may collide. Regarding this, as follows: Figure 14As shown, a buffer sleeve 526 is provided at the end of the first sub-pipe 521 that is away from the second sub-pipe 522 to prevent the adjacent first sub-pipe 521 from moving and causing the corresponding reinforced concrete pipe 1 to vibrate or move horizontally when a collision occurs.

[0102] In practical applications, the circumferential vibration of the reinforced concrete pipe 1 may be caused by the internal fluid flow (when the fluid flows at high speed inside the reinforced concrete pipe 1, it may cause vortex-induced vibration) or external mechanical disturbance (external rotating equipment such as turbines transmit torque through pipe seats, causing torsional vibration of the reinforced concrete pipe 1). Therefore, the present invention also needs to design an isolation mechanism for the torsional vibration of adjacent reinforced concrete pipes 1.

[0103] Specifically, such as Figure 8 As shown, a second movable bolt 527 is provided on the outer side of the end of the first sub-tube body 521, and a second movable groove 528 is provided on the inner side wall of the second sub-tube body 522 along its own circumferential direction. The second movable bolt 527 is slidably disposed inside the second movable groove 528, and the second sub-tube body 522 is slidably disposed outside the first sub-tube body 521 through the second movable bolt 527.

[0104] Assuming there are adjacent nth reinforced concrete pipe 1 and n+1th reinforced concrete pipe 1, when the n+1th reinforced concrete pipe 1 undergoes torsional motion, it will drive the sleeve fitting 3 to undergo torsional motion, thereby driving the second sub-pipe body 522 to undergo torsional motion. When the second sub-pipe body 522 undergoes torsional motion, it will rotate outside the first sub-pipe body 521 through the second movable bolt 527. The first sub-pipe body 521 will not follow the second sub-pipe body 522 to undergo torsional motion, thus achieving vibration transmission isolation in the circumferential direction.

[0105] In practical applications, reinforced concrete pipe 1 may experience vibrations not only in the horizontal and circumferential directions, but also in other directions. For example, factors such as wind loads and seismic waves may cause vertical vibrations. To further prevent vibrations of reinforced concrete pipe 1 in other directions, the present invention further incorporates the following design:

[0106] like Figure 9 As shown, the inner wall of the end of the second sub-tube 522 is provided with a first ring seat 529 and a second ring seat 5210 in sequence;

[0107] The first ring seat 529 allows the docking cone 38 to pass through and the abutting platform 37 to abut against it. The inner diameter of the first ring seat 529 is larger than the outer diameter of the docking cone 38 and smaller than the outer diameter of the abutting platform 37. The outer diameter of the abutting platform 37 is smaller than the inner diameter of the second sub-tube body 522, so as to form a first movable gap 5211 between the inner wall of the abutting platform 37 and the second sub-tube body 522.

[0108] The outer diameter of the abutting platform 37 is larger than the outer diameter of the first limiting plate 35, and the inner diameter of the second ring seat 5210 is larger than the outer diameter of the abutting platform 37. A sealing groove 5212 for the sealing sleeve 63 to be tightly fitted is provided on the side of the second ring seat 5210 away from the first ring seat 529.

[0109] A second movable gap 5213 is formed between the sealing sleeve 63 and the inner wall of the second sub-tube 522.

[0110] like Figure 10 , Figure 13 As shown, two limiting blocks 5214 are symmetrically arranged on the inner wall of the end of the second sub-tube body 522, and a limiting ring seat 39 is provided on the outer wall of the outer tube body 32. A support ring plate 310 is connected to the outer periphery of the limiting ring seat 39, and a through groove 311 is provided on the support ring plate 310 for the limiting blocks 5214 to pass through.

[0111] The outer diameter of the support ring plate 310 is greater than the distance between the two limiting blocks 5214 and less than the inner diameter of the second sub-tube body 522, so as to form a third movable gap 5215 between the support ring plate 310 and the second sub-tube body 522.

[0112] When the fitting 3 is connected to the second sub-pipe 522, the abutting platform 37 abuts against the first ring seat 529, the supporting ring plate 310 abuts against the limiting block 5214, and at least part of the outer wall of the sealing sleeve 63 is tightly fitted into the sealing groove 5212.

[0113] The first sub-tube 521 is externally connected to the third sub-tube 523. The second sub-tube 522 is disposed inside the third sub-tube 523. The inner diameter of the third sub-tube 523 is larger than the outer diameter of the second sub-tube 522. The roller 49 is supported on the inner wall of the third sub-tube 523.

[0114] In the above embodiment, it is assumed that there are adjacent nth reinforced concrete pipe 1 and n+1th reinforced concrete pipe 1. When the n+1th reinforced concrete pipe 1 vibrates vertically, it will drive the sleeve fitting 3 to move vertically, thereby driving the abutment platform 37, sealing sleeve 63, and support ring plate 310 to move vertically. Due to the existence of the first movable gap 5211, the abutment platform 37 will not interfere with the second sub-pipe body 522 during vertical movement. Due to the existence of the second movable gap 5213, and the fact that the sealing sleeve 63 itself is deformable, when the sealing sleeve 63 moves vertically, There will be no interference with the second sub-tube body 522. Due to the existence of the third movable gap 5215, there will also be no interference with the second sub-tube body 522 during the vertical movement of the support ring plate 310. In addition, during the vertical movement of the sleeve fitting 3, under the action of the buffer spring 46, some of the buffer support members 4 will retract inward and some of the buffer support members 4 will expand outward, always maintaining a state of mutual support with the third sub-tube body 523. Thus, there is a buffering effect between the buffer support members 4 and the third sub-tube body 523, so the third sub-tube body 523 will not be driven to move, and therefore the first sub-tube body 521 will not be driven in the vertical direction.

[0115] Based on the above process, when the fitting 3 vibrates in the vertical direction, it will not drive the first sub-pipe 521 and the second sub-pipe 522 to produce the same driving effect, so that the first sub-pipe 521 and the second sub-pipe 522 will not move when the fitting 3 moves vertically.

[0116] The above example illustrates vibration in the vertical direction. If vibration occurs along other diameter directions of the pipe, the process is the same as described above. It will not have a corresponding driving effect on the first sub-pipe 521 and the second sub-pipe 522, so that the first sub-pipe 521 and the second sub-pipe 522 will not move when the fitting 3 moves, thus achieving vibration transmission isolation in the diameter direction of the reinforced concrete pipe 1.

[0117] In this invention, the design of the first ring seat 529 and the second ring seat 5210 serves two purposes: vibration isolation and cooperating with the sealing element 6 to achieve a seal, as detailed below:

[0118] During installation, the docking cone 38 is aligned with the first ring seat 529, the through groove 311 is aligned with the limiting block 5214, the sealing element 6 is placed into the second sub-tube body 522, the abutting platform 37 abuts against the first ring seat 529, a thrust is applied to the outer tube body 32 along its own length direction, so that the supporting ring plate 310 also enters the second sub-tube body 522, a torsional force is applied to the outer tube body 32, so that the inner tube body 31 and the outer tube body 32 rotate synchronously. During the rotation, the limiting block 5214 is no longer directly aligned with the through groove 311. At this time, the thrust is released, and the sealing element 6 and the tube head position of the fitting 3 have been fixed in the second sub-tube body 522.

[0119] At the same time, the abutting platform 37 abuts against the first ring seat 529, the supporting ring plate 310 is supported on the limiting block 5214, the connecting spring 62 is in a compressed state, and the sealing sleeve 63 is tightly fitted with the sealing groove 5212, thus achieving multiple seals between the abutting platform 37 and the first ring seat 529, and between the sealing sleeve 63 and the sealing groove 5212.

[0120] Based on the above process, the fitting 3 and the pipe connection structure 5 have been connected. If a certain reinforced concrete pipe 1 experiences torsional vibration, due to the abutment design between the abutment platform 37 and the first ring seat 529, and between the support ring plate 310 and the limiting plate, corresponding frictional resistance is generated. Compared with this frictional resistance, the resistance generated between the second movable bolt 527 and the second movable groove 528 is smaller. Therefore, when the fitting 3 experiences torsional vibration, it will be easier to drive the second sub-pipe body 522 to rotate, and will not drive the first sub-pipe body 521 to rotate. This avoids the sealing element 6 from moving in the circumferential direction relative to the second sub-pipe body 522 during torsional vibration, which would cause wear over time.

[0121] In addition, the inner diameter of the third sub-tube 523 is larger than the outer diameter of the second sub-tube 522, and there is a certain gap between the third sub-tube 523 and the second sub-tube 522. When the second sub-tube 522 rotates relative to the first sub-tube 521, it will not be subject to the frictional resistance of the third sub-tube 523.

[0122] In this invention, when the sleeve fitting 3 follows the reinforced concrete pipe 1 and generates torsional vibration, in order to reduce the resistance of the second sub-pipe body 522 relative to the first sub-pipe body 521, the roller 49 can be set as a universal roller 49. Based on this, the roller 49 can roll on the inner wall of the third sub-pipe body 523 during this process, and the rolling friction generated is extremely small, which will not affect the movement of the second sub-pipe body 522 relative to the first sub-pipe body 521.

[0123] In summary, the main implementation process of this invention is as follows:

[0124] Before transportation, the reinforced concrete pipe 1 is placed on the transport vehicle, and the roller 49 is placed on the surface of the transport vehicle. Under the gravity of the reinforced concrete pipe 1, the rotating rod 48 will rotate inward at a certain angle. If there is a bump during transportation, the buffer spring 46 applies a buffering force to the outer sleeve 44, so that the rotating rod 48 rotates slowly. The reinforced concrete pipe 1 may have a small amplitude of up and down swaying, and will not bump synchronously with the transport vehicle.

[0125] During installation, the reinforced concrete pipe 1 is hoisted above the pipe seat using a lifting device and then lowered. The roller 49 first contacts the surface of the support, and then the reinforced concrete pipe 1 slowly descends under the buffering effect, gradually contacting and being placed into the pipe seat, ensuring the stability of the installation process.

[0126] The inter-pipe connection structure 5 is raised by supports and placed between adjacent reinforced concrete pipes 1. The butt cone 38 is aligned with the first ring seat 529 and the through groove 311 is aligned with the limiting block 5214. The position of the inter-pipe connection structure 5 is adjusted along the length direction so that the sealing element 6 is placed into the second sub-pipe body 522 and the abutting platform 37 abuts against the first ring seat 529. A thrust along its own length direction is applied to the outer pipe body 32 so that the supporting ring plate 310 also enters the second sub-pipe body 522. A torsional force is applied to the outer pipe body 32, and the inner pipe body 31 and the outer pipe body 32 rotate synchronously. During the rotation, the limiting block 5214 is no longer directly aligned with the through groove 311. The thrust is released, and the installation between the fitting 3 and the inter-pipe connection structure 5 is completed.

[0127] During use, when the (n+1)th reinforced concrete pipe 1 moves laterally, it will cause the sleeve fitting 3 to move laterally, which in turn causes the second sub-pipe body 522 and the first sub-pipe body 521 to move laterally. When the first sub-pipe body 521 moves laterally, it will slide within the main pipe body 51 through the first movable bolt 525. The main pipe body 51 will not move laterally with the first sub-pipe body 521, thus preventing the nth reinforced concrete pipe 1 from vibrating horizontally.

[0128] When the (n+1)th reinforced concrete pipe 1 undergoes torsional motion, it will cause the sleeve fitting 3 to undergo torsional motion, which in turn causes the second sub-pipe 522 to undergo torsional motion. When the second sub-pipe 522 undergoes torsional motion, it will rotate outside the first sub-pipe 521 through the second movable bolt 527. The first sub-pipe 521 will not follow the second sub-pipe 522 to undergo torsional motion, thus avoiding torsional vibration of the nth reinforced concrete pipe 1.

[0129] When the (n+1)th reinforced concrete pipe 1 vibrates along its own diameter, it will cause the fitting 3 to move along its own diameter, thereby causing the abutment platform 37, sealing sleeve 63, and support ring plate 310 to move in the corresponding directions. The abutment platform 37 will not interfere with the second sub-pipe 522 during its vertical movement, the sealing sleeve 63 will not interfere with the second sub-pipe 522 during its vertical movement, and the support ring plate 310 will not interfere with the second sub-pipe 522 during its vertical movement. This ensures that the fitting 3 will not cause the second sub-pipe 522 to move when it moves along its own diameter, thus preventing the nth reinforced concrete pipe 1 from vibrating in the corresponding direction.

[0130] Therefore, if the reinforced concrete pipe 1 itself is not affected by external factors and vibrates, it will not be affected by the vibration of the adjacent reinforced concrete pipe 1.

[0131] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. A protective device for the anti-corrosion coating of prestressed reinforced concrete pipes, characterized in that, have: Fitting (3) is installed at the end of the reinforced concrete pipe (1); Connecting sleeve (2), the fitting (3) is fixedly connected to the reinforced concrete pipe (1) through the connecting sleeve (2); A buffer support (4) is installed on the outer periphery of the sleeve fitting (3). The buffer support (4) raises the sleeve fitting (3) and the reinforced concrete pipe (1) and provides a buffering effect for the reinforced concrete pipe (1) in motion. The pipe connection structure (5) is installed between two adjacent reinforced concrete pipes (1). The fittings (3) at the close ends of the adjacent reinforced concrete pipes (1) are connected by the pipe connection structure (5). The adjacent reinforced concrete pipes (1) are connected by the fittings (3) and the pipe connection structure (5). A sealing element (6) is provided on the end of the sleeve fitting (3) away from the reinforced concrete pipe (1) and is tightly connected to the inter-pipe connection structure (5) to seal the connection between the sleeve fitting (3) and the inter-pipe connection structure (5). The pipe connection structure (5) is formed by the movable connection of the main pipe body (51) and the sub-pipe body component (52). The fittings (3) located at both ends of the pipe connection structure (5) are all connected to the sub-pipe body component (52). The main pipe body (51) and the sub-pipe body component (52) are movably connected, and the sub-pipe body component (52) and the fittings (3) are movably connected, so that the fittings (3) can move relative to the sub-pipe body component (52) or the main pipe body (51) along the length direction, diameter direction and circumferential direction of the pipe connection structure (5), so that the main pipe body (51) does not move synchronously when one of the fittings (3) moves.

2. The protective device for the anti-corrosion coating of prestressed reinforced concrete pipes according to claim 1, characterized in that, The fitting (3) includes an inner tube (31) and an outer tube (32) fitted outside the inner tube (31). The outer wall of the inner tube (31) is provided with a limiting protrusion (33), and the inner wall of the outer tube (32) is provided with a limiting groove (34). The side wall of the limiting protrusion (33) fits into the inner wall of the limiting groove (34), and the limiting protrusion (33) is slidably disposed in the limiting groove (34). The length of the outer tube (32) is less than the length of the inner tube (31). One end of the inner tube (31) is provided with a first limiting plate (35), and the outer wall of the other end is provided with a limiting protrusion (36). The outer tube (32) is movably disposed between the first limiting plate (35) and the limiting protrusion (36). The first limiting plate (35) is connected to an annular abutment platform (37), and the abutment platform (37) is connected to an annular docking cone (38).

3. The protective device for the anti-corrosion coating of prestressed reinforced concrete pipe according to claim 2, characterized in that, The sealing element (6) includes a second limiting plate (61) disposed at the end of the inner tube (31) near the first limiting plate (35) and a connecting spring (62) disposed between the first limiting plate (35) and the second limiting plate (61). The connecting spring (62) surrounds the outside of the inner tube (31), and one end of it is connected to the first limiting plate (35) and the other end is connected to the second limiting plate (61). A sealing sleeve (63) is connected between the first limiting plate (35) and the second limiting plate (61). An air cavity (64) is formed between the sealing sleeve (63) and the outer wall of the inner tube (31). The connecting spring (62) is placed in the air cavity (64).

4. The protective device for the anti-corrosion coating of prestressed reinforced concrete pipe according to claim 3, characterized in that, Several of the aforementioned buffer supports (4) are installed in a circumferential array on the outer wall of the outer tube (32); The buffer support (4) includes a first bearing (41) and a second bearing (42) disposed on the outer wall of the outer tube (32); A rotating rod (48) is rotatably connected to the first bearing seat (41) via a first rotating shaft (43), and a roller (49) is rotatably connected to the end of the rotating rod (48) via a second rotating shaft. The middle position of the rotating rod (48) is rotatably connected to an outer sleeve (44) via a third rotating shaft. An inner sleeve (45) is movably disposed inside the outer sleeve (44). A buffer spring (46) is connected between the outer sleeve (44) and the inner sleeve (45). The buffer spring (46) is disposed inside the outer sleeve (44). The end of the inner sleeve (45) extends out of the outer sleeve (44). A fourth rotating shaft (47) is installed at the end of the inner sleeve (45) and is rotatably mounted on the second bearing seat (42) via the fourth rotating shaft (47).

5. The protective device for the anti-corrosion coating of prestressed reinforced concrete pipe according to claim 4, characterized in that, The sub-tube component (52) includes a first sub-tube (521) symmetrically arranged at both ends of the main tube (51) and a second sub-tube (522) sleeved outside the ends of the first sub-tube (521). The end of the inner tube (31) is connected to the second sub-tube (522). The inner wall of the main tube (51) is provided with a first movable groove (524) along its own length direction. The outer wall of the first sub-tube (521) is provided with a first movable bolt (525). The first movable bolt (525) is slidably disposed in the first movable groove (524). The first sub-tube (521) is slidably disposed in the main tube (51) through the first movable bolt (525). A buffer sleeve (526) is provided at the end of the first sub-tube (521) that is away from the second sub-tube (522).

6. The protective device for the anti-corrosion coating of prestressed reinforced concrete pipe according to claim 5, characterized in that, A second movable bolt (527) is provided on the outer end of the first sub-tube body (521), and a second movable groove (528) is provided on the inner side wall of the second sub-tube body (522) along its own circumferential direction. The second movable bolt (527) is slidably disposed inside the second movable groove (528), and the second sub-tube body (522) is slidably disposed outside the first sub-tube body (521) through the second movable bolt (527).

7. The protective device for the anti-corrosion coating of prestressed reinforced concrete pipe according to claim 6, characterized in that, The inner wall of the end of the second sub-tube (522) is provided with a first ring seat (529) and a second ring seat (5210) in sequence. The first ring seat (529) is for the docking cone (38) to pass through and for the abutting platform (37) to abut against. The inner diameter of the first ring seat (529) is larger than the outer diameter of the docking cone (38) and smaller than the outer diameter of the abutting platform (37). The outer diameter of the abutting platform (37) is smaller than the inner diameter of the second sub-tube body (522) to form a first movable gap (5211) between the abutting platform (37) and the inner wall of the second sub-tube body (522). The outer diameter of the abutting platform (37) is larger than the outer diameter of the first limiting plate (35), the inner diameter of the second ring seat (5210) is larger than the outer diameter of the abutting platform (37), and a sealing groove (5212) for the sealing sleeve (63) to be tightly fitted on the side of the second ring seat (5210) away from the first ring seat (529). A second movable gap (5213) is formed between the sealing sleeve (63) and the inner wall of the second sub-tube (522).

8. The protective device for the anti-corrosion coating of prestressed reinforced concrete pipe according to claim 7, characterized in that, The inner wall of the second sub-tube (522) is symmetrically provided with two limiting blocks (5214), and the outer wall of the outer tube (32) is provided with a limiting ring seat (39). The outer periphery of the limiting ring seat (39) is connected with a support ring plate (310), and the support ring plate (310) is provided with a through groove (311) for the limiting block (5214) to pass through. The outer diameter of the support ring plate (310) is greater than the distance between the two limiting blocks (5214) and less than the inner diameter of the second sub-tube body (522) to form a third movable gap (5215) between the support ring plate (310) and the second sub-tube body (522). When the fitting (3) is connected to the second sub-pipe (522), the abutting platform (37) abuts against the first ring seat (529), the supporting ring plate (310) abuts against the limiting block (5214), and at least part of the outer wall of the sealing sleeve (63) is tightly fitted into the sealing groove (5212).

9. The protective device for the anti-corrosion coating of prestressed reinforced concrete pipe according to claim 7, characterized in that, The first sub-tube body (521) is externally connected to a third sub-tube body (523), and the second sub-tube body (522) is disposed inside the third sub-tube body (523). The inner diameter of the third sub-tube body (523) is larger than the outer diameter of the second sub-tube body (522). The roller (49) is supported on the inner wall of the third sub-tube (523).

10. The protective device for the anti-corrosion coating of prestressed reinforced concrete pipe according to claim 1, characterized in that, Both the reinforced concrete pipe (1) and the fitting (3) are provided with a protruding pipe head (7) at their ends. The outer diameter of the protruding pipe head (7) is larger than the outer diameter of the reinforced concrete pipe (1) and the fitting (3). The outer wall of the connecting sleeve (2) forms a protruding receiving wall (8), and the receiving wall (8) is provided with a socket (9) for the protruding tube head (7) to be installed and embedded. The end of the connecting sleeve (2) is installed on the inner wall of the reinforced concrete pipe (1) and the fitting (3).

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