Pressure pipeline three-way branch pipe lining repairing structure

Abstract

The utility model relates to the technical field of pressure pipeline three-way branch pipe repairing, and provides a pressure pipeline three-way branch pipe lining repairing structure which comprises a repairing pipe attached to the inner wall of a three-way branch pipe, one end of the repairing pipe is in flush butt joint with a lining of the three-way branch pipe, and the other end of the repairing pipe is connected with a seat piece. The seat piece is attached to the lining of the three-way main pipe in a lap joint mode, one end of the supplementary pipe is fastened to the inner wall of the three-way branch pipe through a first bolt, the other end of the supplementary pipe sequentially penetrates through the seat piece and the lining of the three-way main pipe through a second bolt and then is fastened to the three-way main pipe, and sealant is injected between the supplementary pipe and the three-way branch pipe and between the seat piece and the lining of the three-way main pipe. The repairing pipe attached to the inner wall of the branch pipe of the tee joint is arranged, the two ends of the repairing pipe are fastened to the tee joint through the first bolt and the second bolt respectively, axial and radial double mechanical constraints are formed, the axial load of the branch pipe is offset, stress concentration of a main pipe lining is dispersed, a sealant is injected between the repairing structure and the tee joint, a micro gap is filled, and the sealing performance and durability are improved.

Description

Technical Field

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

[0002] In buried pressure pipeline networks, the connection between the branch pipe and the main pipe in a tee is a critical transition area for media diversion. Its inner wall directly bears the high-speed scouring during fluid diversion, the axial load of the branch pipe, and the complex stress coupling effect. Compared with the main tee pipe and straight pipe sections, the lining in this area is more prone to failure problems such as damage and peeling due to abrupt changes in geometric curvature and stress concentration effects. Since the branch pipe and the main pipe are orthogonal or of different diameters, and the inner wall space is narrow and the surface shape is complex, the lining repair at the branch pipe location places higher demands on fitting accuracy, sealing reliability, and structural stability, urgently requiring targeted and efficient repair solutions.

[0003] Currently, the repair of branch pipes in tightly lined tees of large-diameter pressure pipelines still commonly uses the traditional adhesive bonding process. This involves removing the damaged liner and manually pasting a new liner onto the inner wall of the branch pipe, relying on adhesives for fixation. However, this bonding process is limited by the narrow space and complex curves inside the pipeline, making it difficult to ensure a tight fit between the liner and the inner wall of the branch pipe. This easily leads to air bubbles and gaps at corners and diameter changes, causing media leakage. Furthermore, traditional repair methods rely solely on adhesives for bonding force, lacking constraints on the axial and radial displacement of the branch pipe liner. This makes it difficult to withstand the dynamic loads caused by pipeline pressure fluctuations and fluid impacts, resulting in insufficient repair durability. Frequent downtime for maintenance is often required, severely impacting pipeline transport efficiency and increasing operation and maintenance costs. Utility Model Content

[0004] The purpose of this utility model is to provide a repair structure for the inner lining of a pressure pipeline tee branch, which solves the problems of poor sealing and poor durability in the existing repair of the inner lining of large-diameter pressure pipeline tee branch.

[0005] This utility model is achieved through the following technical solution: a pressure pipeline tee branch pipe lining repair structure, including a patch pipe that fits against the inner wall of the tee branch pipe, one end of the patch pipe being flush with the inner lining of the tee branch pipe, and the other end of the patch pipe being connected to a seat plate, the seat plate being fitted and overlapping the inner lining of the tee main pipe, one end of the patch pipe being fastened to the inner wall of the tee branch pipe by a first bolt, and the other end of the patch pipe being fastened to the tee main pipe by a second bolt passing through the seat plate and the inner lining of the tee main pipe in sequence, and a sealant being injected between the patch pipe and the tee branch pipe and between the seat plate and the inner lining of the tee main pipe.

[0006] Furthermore, the seat plate is provided with several second positioning holes for positioning and connecting the second bolts, and the tee branch pipe is coaxially connected with an end flange. The second positioning holes are evenly spaced along the outer circumference of the tee branch pipe.

[0007] Furthermore, the end of the tube is provided with a number of first positioning holes evenly spaced along the circumference for positioning and connecting the first bolt.

[0008] Furthermore, the sealant is food-grade epoxy resin.

[0009] Furthermore, the outer wall of the branch pipe at the end away from the main tee pipe is provided with a first anti-slip groove that contacts the inner wall of the branch pipe.

[0010] Furthermore, the seat plate is provided with a second anti-slip texture along the circumference of the tee branch pipe, which contacts the inner lining of the tee main pipe.

[0011] Furthermore, the tube and seat plate are integrally molded from EPDM rubber material.

[0012] Furthermore, the seat plate is saddle-shaped.

[0013] This utility model has at least the following advantages and beneficial effects: by setting a patch pipe that fits against the inner wall of the tee branch pipe, the two ends of the patch pipe are fastened to the tee by the first bolt and the second bolt respectively, the seat plate overlaps the inner lining of the main pipe, and sealant is injected between the patch pipe and the tee branch pipe and the seat plate and the inner lining of the tee main pipe, forming a double mechanical constraint in the axial and radial directions, offsetting the axial load of the branch pipe, dispersing the stress concentration of the inner lining of the main pipe, and filling the micro gaps with sealant to limit the displacement of the patch pipe, thus improving the sealing performance and durability. Attached Figure Description

[0014] Figure 1 This utility model provides a longitudinal sectional view of the installation of a pressure pipeline tee branch pipe lining repair structure.

[0015] Figure 2 This utility model provides a cross-sectional view of the installation of a pressure pipeline tee branch pipe lining repair structure.

[0016] Figure 3 A schematic diagram of a pressure pipeline tee branch pipe lining repair structure provided by this utility model.

[0017] Reference numerals: 11-Tee branch pipe, 12-Tee main pipe, 21-Supplement pipe, 210-First positioning hole, 22-Seat plate, 220-Second positioning hole, 31-First bolt, 32-Second bolt. Detailed Implementation

[0018] The specific implementation method is described below with reference to the accompanying drawings.

[0019] Example

[0020] like Figures 1 to 3As shown in this embodiment, a pressure pipeline tee branch pipe lining repair structure is disclosed, including a repair pipe 21 that fits against the inner wall of the tee branch pipe 11. One end of the repair pipe 21 is flush with the inner lining of the tee branch pipe 11, and the other end of the repair pipe 21 is connected to a seat plate 22. The seat plate 22 fits and overlaps the inner lining of the tee main pipe 12. One end of the repair pipe 21 is fastened to the inner wall of the tee branch pipe 11 by a first bolt 31, and the other end of the repair pipe 21 is fastened to the tee main pipe 12 by a second bolt 32 after passing through the seat plate 22 and the inner lining of the tee main pipe 12 in sequence. Sealant is injected between the repair pipe 21 and the tee branch pipe 11 and between the seat plate 22 and the inner lining of the tee main pipe 12. Specifically, the patch tube 21 fits the curved inner wall of the tee branch pipe 11, with one end flush with the inner lining of the tee branch pipe 11, and the other end overlapping the inner lining of the tee main pipe 12 via the seat plate 22. Injected sealant fills the microscopic gaps between the patch tube 21 and the tee branch pipe 11, and between the seat plate 22 and the inner lining of the tee main pipe 12. The patch tube 21 is fastened to the inner wall of the branch pipe by the first bolt 31, and the seat plate 22 is connected to the main pipe by the second bolt 32, forming a dual mechanical constraint in both axial and radial directions. The preload provided by the first bolt 31 and the second bolt 32 can offset the axial load of the branch pipe, and the overlapping surface of the seat plate 22 disperses the stress concentration of the main pipe lining. For example, when the pipeline pressure changes abruptly, the tensile force of the first bolt 31 and the second bolt 32, combined with the adhesive force of the sealant, works synergistically to limit the displacement of the patch tube 21 and prevent peeling failure. Through mechanical fastening and sealing filling, the problems of poor sealing and durability in the repair of the inner lining of the tee branch pipe 11 in existing large-diameter pressure pipelines are solved. It should be noted that in pressure pipelines, since the diameter of the tee branch pipe 11 is usually smaller than that of the tee main pipe 12, the repair structure can be accessed from the tee main pipe 12, and the operation can be carried out using the more spacious space of the tee main pipe 12.

[0021] Furthermore, in a specific implementation, the aforementioned seat 22 provided in this embodiment of the present invention has a plurality of second positioning holes 220 for positioning and connecting the second bolts 32. The second positioning holes 220 are evenly spaced along the outer circumference of the tee branch pipe 11. Specifically, the tee branch pipe 11 is usually coaxially connected to an end flange for connecting external equipment. The end flange has a connection hole, and a flange plate identical to the end flange can be used as the opening positioning reference for the second positioning holes 220.

[0022] Furthermore, in a specific implementation, the end of the above-mentioned supplementary pipe 21 provided in this utility model embodiment is provided with a plurality of first positioning holes 210 for positioning and connecting the first bolt 31 at even intervals along the circumference, so that the preload of the first bolt 31 is evenly distributed along the circumference of the inner wall of the branch pipe, thereby reducing the risk of local stress concentration.

[0023] Furthermore, in specific implementations, the sealant provided in this embodiment of the invention is a food-grade epoxy resin (e.g., phenolic epoxy), which balances safety, sealing performance, and durability. Food-grade certification ensures the medium is uncontaminated and is suitable for drinking water and food fluid transport pipelines. Secondly, after curing, the epoxy resin possesses high-strength adhesion, capable of filling the micron-level gaps between the patch pipe 21 and the branch pipe, and between the seat plate 22 and the main pipe, forming a zero-permeability sealing layer. Its temperature range matches the operating conditions of pressure pipelines, and it is resistant to chemical corrosion, avoiding the adhesion degradation caused by long-term immersion of traditional adhesives.

[0024] Furthermore, in a specific implementation, the outer wall of the patch pipe 21 provided in this embodiment of the present invention, at the end away from the main tee pipe 12, is provided with a first anti-slip texture that contacts the inner wall of the tee branch pipe 11. Specifically, the first anti-slip texture can be a serrated or grid-like protrusion, increasing the contact friction coefficient between the patch pipe 21 and the inner wall of the branch pipe. Combined with the adhesive force of the sealant and the bolt tension, a triple anti-displacement mechanism is formed. The anti-slip texture is evenly distributed around the circumference of the patch pipe 21 and is offset from the first positioning hole 210 to avoid weakening the strength of the patch pipe 21. In addition, the area where the inner diameter changes abruptly at the connection between the tee branch pipe 11 and the main tee pipe 12 (such as the diameter change point) is a displacement-sensitive point. Anti-slip textures can also be densely arranged in this area to effectively counteract fluid dynamic loads.

[0025] Furthermore, in a specific implementation, the aforementioned seat plate 22 provided in this embodiment of the present invention is provided with a second anti-slip texture along the circumference of the tee branch pipe 11, which contacts the inner lining of the tee main pipe 12. Specifically, the first anti-slip texture can be a serrated or grid-like groove engraved on the seat plate 22. When the seat plate 22 overlaps with the inner lining of the main pipe, the flow of fluid in the main pipe will generate circumferential shear force. The anti-slip texture design changes the contact interface between the seat plate 22 and the inner lining of the main pipe from planar friction to toothed engagement, thereby increasing the circumferential friction. The anti-slip texture extends circumferentially along the edge of the seat plate 22, conforming to the curved shape of the inner lining of the main pipe, and dispersing the stress at the overlap.

[0026] Furthermore, in specific implementations, the aforementioned patch 21 and seat 22 provided in this embodiment of the present invention are integrally molded from EPDM rubber material. EPDM rubber has excellent aging resistance, weather resistance, and temperature resistance, making it suitable for the humid and acidic / alkaline environments of buried pipelines. The integral molding process eliminates splicing seams, ensuring that there are no weak points in the transition area between the patch 21 and the seat 22. The elastic deformation capacity of the rubber material can compensate for the thermal expansion and contraction of the pipeline, reducing stress concentration caused by temperature changes.

[0027] Furthermore, in specific implementation, the seat plate 22 provided in this embodiment of the present invention is saddle-shaped. The intersection of the tee main pipe 12 and the branch pipe forms a saddle surface (hyperboloid), which is difficult for a traditional flat seat plate 22 to fit completely, easily forming gaps at the edges. The saddle-shaped seat plate 22 is fitted with the intersecting curved surface through mathematical modeling (the radius of curvature matches the geometric parameters of the tee), increasing the contact area between the seat plate 22 and the inner lining of the tee main pipe 12, and eliminating the sealing blind spot at the corner. Its arc-shaped edge extends along the axial direction of the main pipe, covering the entire transition area (including the diameter change section) where the tee branch pipe 11 and the tee main pipe 12 connect, ensuring that the impact force when the fluid changes direction is evenly transmitted to the inner lining of the main pipe, rather than concentrated at a local point. During installation, the curved surface of the saddle-shaped seat plate 22 naturally adapts to the tee structure, eliminating the need for secondary processing on-site (such as cutting or bending), reducing construction difficulty.

[0028] The installation operation method of the pressure pipeline tee branch pipe 11 repair structure provided by this utility model is as follows: Manually enter the pipeline from the tee main pipe 12 to locate the tee branch pipe 11. Use a handheld angle grinder to cut the lining of the tee branch pipe 11 and grind it well. Then, using a flange as a reference, align the center hole of the flange with the inner hole of the tee branch pipe 11 and abut it against the lining of the tee main pipe 12. Use a marker to draw positioning marks on the lining of the tee main pipe 12 along the connection hole of the flange. Then... A standard drill bit is used to drill a threaded hole aligned with the positioning mark. The threaded hole needs to penetrate the inner lining of the tee main pipe 12 and form a countersunk hole in the original tee main pipe 12 wall. Then, the repair structure is inserted into the tee branch pipe 11. Food-grade epoxy resin is forcibly injected between the repair structure and the tee through the first positioning hole 210 and the second positioning hole 220 respectively using a high-pressure glue gun. The first bolt 31 and the second bolt 32 are then tightened onto the tee. After the food-grade epoxy resin cures, the sealing repair of the inner lining of the tee branch pipe 11 is achieved.

Claims

1. A pressure pipe tee branch liner repair structure, characterized by, The three-way branch pipe (11) is provided with a patch pipe (21) which is in close contact with the inner wall of the three-way branch pipe (11), one end of the patch pipe (21) is in flush joint with the inner lining of the three-way branch pipe (11), the other end of the patch pipe (21) is connected with a seat piece (22), the seat piece (22) is in close contact with the inner lining of the three-way main pipe (12), one end of the patch pipe (21) is fastened with the inner wall of the three-way branch pipe (11) through a first bolt (31), the other end of the patch pipe (21) is fastened with the three-way main pipe (12) after passing through the seat piece (22) and the inner lining of the three-way main pipe (12) in sequence through a second bolt (32), and the patch pipe (21) and the three-way branch pipe (11) and the seat piece (22) and the inner lining of the three-way main pipe (12) are all injected with a sealing agent.

2. A penstock tee branch liner repair structure according to claim 1, characterized in that, A plurality of second positioning holes (220) for positioning and connecting the second bolt (32) are formed in the seat piece (22), and the second positioning holes (220) are uniformly and circumferentially spaced apart along the three-way branch pipe (11).

3. A penstock tee branch liner repair structure according to claim 1, wherein A plurality of first positioning holes (210) for positioning and connecting the first bolt (31) are uniformly and circumferentially spaced apart on the end of the patch pipe (21).

4. A penstock tee branch liner repair structure according to claim 1, characterized by, The sealing agent is a food-grade epoxy resin.

5. A penstock tee branch liner repair structure according to claim 1, wherein A first anti-skid pattern which is in contact with the inner wall of the three-way branch pipe (11) is arranged on the outer wall of the end of the patch pipe (21) which is away from the three-way main pipe (12).

6. A penstock tee branch liner repair structure according to claim 1 wherein, A second anti-skid pattern which is in contact with the inner lining of the three-way main pipe (12) is arranged on the seat piece (22) in the circumferential direction of the three-way branch pipe (11).

7. A penstock tee branch liner repair structure according to claim 1 wherein, The patch pipe (21) and the seat piece (22) are integrally formed by using EPDM rubber material.

8. A penstock tee branch liner repair structure according to claim 1 wherein, The seat piece (22) is saddle-shaped.

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