Tee joint lining repairing structure

Abstract

The utility model relates to the technical field of pressure pipe network tee joint repairing, and provides a tee joint lining repairing structure which comprises a flexible inner repairing piece tightly matched with the inner wall of a tee joint, and expansion rings used for expanding and pressing the flexible inner repairing piece in the tee joint are arranged at the positions, at the two ends of a tee joint main pipe and the end of a tee joint branch pipe, of the inner side of the flexible inner repairing piece respectively. Each expansion ring comprises an opening ring and a plug block clamped to an opening of the opening ring, the expansion rings are arranged at the two ends of the three-way main pipe and the ends of the branch pipes respectively through the flexible inner repairing piece and the combined structure of the opening rings and the plug blocks, multi-point distributed pressing is formed, creep relaxation of the flexible inner repairing piece is restrained, and the three-way main pipe is more flexible. The problems of fitting degree and sealing reliability of three-way repair in a pressure pipe network are solved in a targeted mode.

Description

Technical Field

[0001] This utility model relates to the field of pressure pipeline tee repair technology, and more specifically, to a tee lining repair structure. Background Technology

[0002] In the complex topology of buried pressure pipeline networks, tees, as critical nodes for media diversion or convergence, are subjected to long-term fluid impact, stress concentration, and multi-directional loads. Their internal wall corrosion, erosion, and structural damage rates are significantly higher than those of straight pipe sections. Especially for large-diameter pipelines, the complex geometry and dramatic curvature changes in the tee area mean that damage to the lining will severely impact the safety and efficiency of media transport. Therefore, the reliability and effectiveness of repair techniques are crucial.

[0003] Currently, the repair of tees with tightly fitted inner linings on large-diameter pipelines mostly adopts traditional methods of partial replacement or repair. This involves cutting off the damaged inner lining and manually applying and bonding new inner lining material. However, due to the limited internal space of the pipeline, manual bonding is difficult, and it is hard to guarantee the fit between the new inner lining and the main pipe and branch pipes, easily leading to gaps and poor sealing. Furthermore, the bonding is greatly affected by the environment and the operator's skill level, resulting in inconsistent quality. The durability of the repaired inner lining is insufficient and cannot meet the needs of long-term use. Frequent repairs not only increase maintenance costs but may also affect the normal operation of the pipeline. Utility Model Content

[0004] The purpose of this invention is to provide a tee lining repair structure that solves the problems of poor sealing and insufficient durability in existing large-diameter pressure pipeline tee lining repairs.

[0005] This utility model is achieved through the following technical solution: a tee liner repair structure, including a flexible inner patch that fits tightly against the inner wall of the tee, and expansion rings for opening and pressing the flexible inner patch inside the tee are respectively provided at both ends of the main pipe and the end of the branch pipe of the tee on the inner side of the flexible inner patch. The expansion ring includes an open ring and a plug that is engaged with the opening of the open ring.

[0006] Furthermore, the flexible inner patch has a limiting component arranged along the axial direction of the tee main pipe, which is bolted to the inner side of the expansion ring for axially limiting the expansion ring.

[0007] Furthermore, the limiting component includes a locking block and a screw threadedly connected to the locking block. The locking block engages with the inner side of the expansion ring, and the screw is connected in series with the locking block along the axial direction of the tee main pipe.

[0008] Furthermore, the flexible inner patch is provided with inner anti-slip texture in the inner circumference that contacts the outer wall of the expansion ring.

[0009] Furthermore, the flexible inner patch has external anti-slip textures on its outer periphery toward the expansion ring position that contact the inner wall of the tee.

[0010] Furthermore, the flexible inner patch is made of EPDM rubber material.

[0011] Furthermore, several expansion rings are evenly spaced at both ends of the tee main pipe and the end of the tee branch pipe.

[0012] This utility model has at least the following advantages and beneficial effects:

[0013] (1) By combining flexible inner patch, open ring and plug, expansion rings are set at both ends of the main pipe and the end of the branch pipe of the tee to form multi-point distributed compression, which constrains and inhibits the creep relaxation of the flexible inner patch, and specifically solves the problems of fit and sealing reliability of tee repair in pressure pipeline network.

[0014] (2) By setting the limiting component of the axial limiting expansion ring in the flexible inner part, the axial movement of the single expansion ring is reduced, the expansion ring is prevented from being misaligned during hydraulic expansion, and rapid assembly is allowed, reducing on-site welding or bonding processes. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a three-way lining repair structure provided by this utility model.

[0016] Figure 2 This is an installation sectional view of a tee lining repair structure provided by this utility model.

[0017] Figure 3 This is a schematic diagram of the expansion ring in a tee lining repair structure provided by this utility model.

[0018] Figure 4 The front view of the expansion ring in a tee lining repair structure provided by this utility model.

[0019] Reference numerals: 1-Tee, 2-Flexible inner lining, 3-Expansion ring, 31-Opening ring, 32-Plug, 4-Limiting assembly, 41-Clamping block, 42-Screw. Detailed Implementation

[0020] The specific implementation method is described below with reference to the accompanying drawings.

[0021] Example

[0022] like Figures 1 to 4As shown, this embodiment mainly discloses a tee liner repair structure, including a flexible inner patch 2 that fits snugly against the inner wall of the tee 1. Expansion rings 3 are respectively provided on the inner side of the flexible inner patch 2 at both ends of the main pipe and the end of the branch pipe of the tee 1 to expand and compress the flexible inner patch 2 within the tee 1. Each expansion ring 3 includes an open ring 31 and a plug 32 that engages with the opening of the open ring 31. Through the combined structure of the flexible inner patch 2, the open ring 31, and the plug 32, expansion rings 3 are respectively provided at both ends of the main pipe and the end of the branch pipe of the tee 1, forming a multi-point distributed compression, constraining and suppressing the creep relaxation of the flexible inner patch 2, and specifically solving the problems of fit and sealing reliability in the repair of the tee 1 in pressure pipeline networks. Specifically, the flexible inner patch 2 adapts to the complex geometry of the inner wall of the tee 1 through its own elastic deformation, while the design of the open ring 31 and the plug 32 allows the diameter of the expansion ring 3 to be dynamically adjusted during installation. In practice, the inner lining of the tee 1 at the location to be repaired is first cut off. Then, the flexible inner patch 2 is rolled up, placed in the corresponding position, unfolded, and the open ring 31 is inserted. A hydraulic device is used to apply hydraulic pressure (e.g., 300 kg) to the open ring 31, causing it to expand and press tightly against the inner wall of the flexible inner patch 2. Subsequently, the opening gap of the expanded open ring 31 is measured on-site. A plug block 32 (stainless steel arc-shaped piece) of the corresponding arc length is cut according to the actual size and hammered into the opening to achieve the sealing function. This process eliminates the gap between the expansion ring 3 and the inner patch caused by pipe size deviation or deformation, ensuring that the uniform clamping force of the expansion ring 3 on the flexible inner patch 2 is transmitted to the inner wall of the tee 1. In addition, the open ring 31 is made of stainless steel, and its open end is provided with a groove for positioning and engaging the plug block 32. After the hydraulic pressure is removed, the open ring 31 can maintain the expanded state after plastic deformation, avoiding the attenuation of compressive stress caused by elastic recoil, thereby maintaining the sealing interface pressure for a long time.

[0023] Furthermore, in a specific implementation, the flexible inner patch 2 provided in this embodiment of the present invention has a limiting component 4 arranged along the axial direction of the main pipe of the tee 1, which is bolted to the inner side of the expansion ring 3 for axial limiting of the expansion ring 3. The limiting component 4 includes a locking block 41 and a screw 42 threadedly connected to the locking block 41. The locking block 41 engages with the inner side of the expansion ring 3, and the screw 42 connects the locking blocks 41 in series along the axial direction of the main pipe of the tee 1. Specifically, the locking block 41 is made of stainless steel and has a slot for engaging with the expansion ring 3. The locking block 41 is fastened to the expansion ring 3 with bolts, and the locking blocks 41 that fix the expansion ring 3 in the same axial direction of the main pipe of the tee 1 are connected one by one by the screw 42 to form a whole, reducing the axial movement of a single expansion ring 3. After a single expansion ring 3 is positioned and installed, it can effectively prevent the expansion ring 3 from being misaligned during hydraulic expansion in subsequent installation, allowing for rapid assembly and reducing on-site welding or bonding processes. It should be noted that the thread pitch of the screw 42 can be determined according to the pipe diameter (for tee 1 with a larger pipe diameter, a larger thread pitch (coarse thread) should be selected to improve adjustment efficiency and enhance load-bearing capacity; for tee 1 with a smaller pipe diameter or when high-precision adjustment is required, a smaller thread pitch (fine thread) should be selected to ensure the positioning accuracy of the expansion ring 3). This ensures that the axial spacing of the expansion ring 3 is uniform while maintaining the consistency of the circumferential position of each locking block 41 relative to the expansion ring 3, thereby improving the stability of the limiting component 4. In addition, multiple limiting components 4 can be symmetrically arranged along the circumference of the expansion ring 3.

[0024] Furthermore, in a specific implementation, the flexible inner patch 2 provided in this embodiment of the invention is provided with an inner anti-slip texture in the circumferential direction that contacts the outer wall of the expansion ring 3. This texture is etched on the contact surface between the inner wall of the flexible inner patch 2 and the expansion ring 3, thereby increasing the coefficient of friction and preventing relative sliding between the expansion ring 3 and the inner patch due to vibration. The width of the inner anti-slip texture is adapted to the width of the expansion ring 3, and the depth does not exceed 1 / 3 of the thickness of the flexible inner patch 2.

[0025] Furthermore, in specific implementation, the flexible inner patch 2 provided in this embodiment of the present invention has an outer anti-slip texture on its outer periphery at the position of the expansion ring 3, which contacts the inner wall of the tee 1. The texture protrudes from the contact surface between the outer wall of the flexible inner patch 2 and the inner wall of the tee 1, utilizing the interlocking effect of the texture to disperse the fluid shear force, preventing the flexible inner patch 2 from rotating or displacing as a whole, and ensuring sealing. The width of the outer anti-slip texture can correspond to the interval arrangement of the expansion rings 3, or it can continuously cover the entire area where the end expansion rings 3 are arranged; the height of the outer anti-slip texture does not exceed 1 / 2 of the thickness of the flexible inner patch 2.

[0026] Furthermore, in specific implementation, the flexible inner patch 2 provided in this utility model embodiment is made of EPDM rubber material, which has excellent acid and alkali resistance and aging resistance, and its compression set is ≤15% (ASTM D395 test). It can still maintain the fit and seal to the inner wall of the tee 1 after long-term pressure.

[0027] Furthermore, in specific implementations, several expansion rings 3 are evenly spaced at both ends of the main pipe of the tee 1 and at the ends of the branch pipes of the tee 1, as provided in this embodiment of the utility model. Specifically, the number of expansion rings 3 can be determined according to the clamping force requirements of local areas (for example, 3 expansion rings 3 (500mm apart) are arranged at each end of the main pipe of the tee 1, and 2 expansion rings 3 (300mm apart) are arranged at the ends of the branch pipes). By clamping at multiple points, the circumferential stress concentration at the intersection of the tee 1 is balanced, avoiding tearing of the inner patch caused by local overload.

Claims

1. A tee-liner repair structure, characterized by, The flexible inner supplement part (2) is tightly fitted with the inner wall of the tee (1), and the inner side of the flexible inner supplement part (2) is provided with a plurality of expansion rings (3) for supporting and pressing the flexible inner supplement part (2) in the tee (1) at the two ends of the main pipe of the tee (1) and the end part of the branch pipe of the tee (1) respectively.

2. A tee liner repair structure according to claim 1, wherein, The flexible inner supplement part (2) is provided with a limiting assembly (4) for axially limiting the expansion ring (3) at the inner side of the expansion ring (3) along the axis of the main pipe of the tee (1).

3. A tee liner repair structure according to claim 2, wherein, The limiting assembly (4) comprises a clamping block (41) and a screw rod (42) threadedly connected with the clamping block (41), the clamping block (41) is in clamping fit with the inner side of the expansion ring (3), and the screw rod (42) is in series connection with the clamping block (41) along the axis of the main pipe of the tee (1).

4. The tee-lined repair structure of claim 1, wherein, The flexible inner supplement part (2) is provided with an inner anti-skid pattern in contact with the outer wall of the expansion ring (3) in the circumferential direction.

5. The tee-lined repair structure according to claim 1, wherein The flexible inner supplement part (2) is provided with an outer anti-skid pattern in contact with the inner wall of the tee (1) in the circumferential direction at the position of the expansion ring (3).

6. The tee-lined repair structure according to claim 1, wherein The flexible inner supplement part (2) is made of EPDM rubber material.

7. The tee-lined repair structure according to claim 1, wherein The expansion ring (3) is uniformly and spacedly provided with a plurality of expansion rings (3) at the two ends of the main pipe of the tee (1) and the end part of the branch pipe of the tee (1).

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