A crack arrestor suitable for high strength gas pipelines

Abstract

The utility model discloses a kind of crack arrestors suitable for high-strength gas pipeline, it is related to pipeline crack arrest technology field. Including steel sleeve assembly and sealing medium layer, the steel sleeve assembly is spliced by several arc steel sleeve units by connecting assembly, and is sleeved in the crack area outer periphery of the pipeline to be repaired, to provide rigid support and inhibit crack propagation;The sealing medium layer is filled in steel sleeve assembly and pipeline, for sealing and buffering.This crack arrestor can form the protective layer of rigid-flexible combination, reliably protects the pipeline to be repaired. Solve the problem that existing repair technology is difficult to realize long-term reliable crack arrest and sealing performance in high-pressure, corrosion medium-containing gas pipeline crack arrest scene.

Description

Technical Field

[0001] This utility model relates to the field of pipeline crack arrest technology, and in particular to a crack arrester suitable for high-strength gas pipelines. Background Technology

[0002] During long-term service, gas pipelines are susceptible to cracking defects in welds, base material, or heat-affected zones due to the combined effects of internal pressure fluctuations, external loads, corrosive media, and temperature changes. Once these cracks propagate, they will seriously threaten the safe operation of the pipeline and may even cause catastrophic leaks.

[0003] Traditional pipeline repair methods mainly include welding patches, sleeve welding, and spiral wound repair, but these methods all have certain limitations in practical applications. Welding patches are limited by site conditions, easily introduce new residual welding stress, and have high requirements for the weldability of the pipeline material; sleeve welding repair has a long construction cycle and a large heat-affected zone, making it unsuitable for high-pressure live pipelines; while spiral wound composite material repair is convenient to construct, it relies solely on adhesive force to bond with the pipeline surface, and the interfacial bond strength is greatly affected by surface treatment quality, ambient temperature and humidity, and long-term creep. Under high pressure and high cyclic load conditions, it is prone to debonding and delamination failure, resulting in unstable crack arrest performance. In addition, existing repair structures often cannot simultaneously ensure a tight seal in the crack area and the overall fatigue and peel resistance of the repair layer. After the seal fails, media leakage will further weaken the structural load-bearing capacity, while insufficient mechanical connection strength limits the restraining effect of the repair body on crack propagation. These problems make it difficult for existing repair technologies to achieve long-term reliable crack arrest and sealing performance in high-pressure, corrosive gas pipeline crack arrest scenarios.

[0004] Based on this, the present invention proposes a crack arrestor suitable for high-strength gas pipelines to solve the problems existing in the prior art. Utility Model Content

[0005] In view of this, the main purpose of this utility model is to provide a crack arrestor suitable for local reinforcement after PE pipeline repair, so as to solve the problem that existing repair technologies are difficult to achieve long-term reliable crack arrest and sealing performance in high-pressure, corrosive gas pipeline crack arrest scenarios.

[0006] To achieve the above objectives, the technical solution of this utility model is implemented as follows: A crack arrester suitable for high-strength gas pipelines includes a steel sleeve assembly and a sealing medium layer. The steel sleeve assembly is composed of several arc-shaped steel sleeve units spliced ​​together by connecting components and is sleeved on the outer periphery of the cracked area of ​​the pipeline to be repaired. The sealing medium layer fills the steel sleeve assembly and the pipeline.

[0007] In a preferred embodiment of the present invention, a plurality of interconnected guide grooves are provided on the inner sidewall of the arc-shaped steel sleeve unit. The guide grooves are distributed in a grid pattern on the inner surface of the arc-shaped steel sleeve unit. At least one glue injection hole penetrating the pipe wall is provided on the arc-shaped steel sleeve unit. One end of the glue injection hole is connected to the outer side of the arc-shaped steel sleeve unit, and the other end is connected to the guide groove on the inner sidewall.

[0008] In a preferred embodiment of this utility model, the cross-sectional shape of the guide groove is semi-circular or trapezoidal.

[0009] In a preferred embodiment of the present invention, the flow guide channel includes a longitudinal main channel extending along the axial direction of the pipe and a transverse sub-channel extending along the circumference of the pipe. The longitudinal main channel and the transverse sub-channel are intersecting and interconnected to form a flow network.

[0010] In a preferred embodiment of this utility model, the glue injection hole is located at the intersection of the longitudinal main groove and the transverse sub-groove.

[0011] In a preferred embodiment of this utility model, a one-way check valve core is installed in the injection hole, which allows the sealant to flow from the outside of the steel sleeve assembly to the inner sidewall.

[0012] In a preferred embodiment of this utility model, the sealing medium layer is composed of a curable sealant that is injected under high pressure through the injection hole and fills the gap between the guide groove and the steel sleeve assembly and the pipeline.

[0013] In a preferred embodiment of the present invention, a plurality of mechanical anchoring structures are provided on the outer side wall of the arc-shaped steel sleeve unit. The mechanical anchoring structures include dovetail-shaped ring ribs continuously distributed along the circumference of the arc-shaped steel sleeve unit, and locking grooves are formed between adjacent dovetail-shaped ring ribs. The locking grooves are matched with the composite material layer.

[0014] In a preferred embodiment of the present invention, a stepped overlapping edge is provided at the connection between adjacent arc-shaped steel sleeve units, and adjacent overlapping edges are connected by a connecting component.

[0015] In a preferred embodiment of the present invention, a sealing strip groove is provided on the stepped overlapping edge, and the sealing strip groove matches the sealing strip.

[0016] Compared with the prior art, this utility model provides a crack arrestor suitable for high-strength gas pipelines, which has the following beneficial effects: This crack arrester employs a combined structure of a steel sleeve assembly, a sealing medium layer, and a composite material layer. The steel sleeve assembly is composed of arc-shaped steel sleeve units spliced ​​together. An inner guide groove and injection hole work together to inject a high-pressure curing sealant, forming a sealing medium layer that ensures the sealing of the cracked area. The outer mechanical anchoring structure, such as a dovetail-shaped ring rib, forms a macroscopic mechanical interlock with the composite material layer, enhancing connection strength and effectively preventing radial separation. Simultaneously, the stepped overlap edge and stress-relieving chamfer design optimize the splicing seal and stiffness transition, reducing stress concentration. Ultimately, this invention achieves efficient crack arrest and long-term stable repair of pipeline cracks, improving the sealing, strength, and durability of the repair structure, providing a reliable guarantee for the safe operation of pipelines. It solves the problem that existing repair technologies struggle to achieve long-term reliable crack arrest and sealing performance in high-pressure, corrosive gas pipeline crack arrest scenarios. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is the usage state of the crack arrestor of this utility model. Figure 1 .

[0019] Figure 2 This is the usage state of the crack arrestor of this utility model. Figure 2 .

[0020] Figure 3 This is an exploded view of the crack arrestor of this utility model.

[0021] Figure 4 This is a cross-sectional view of the arc-shaped steel sleeve unit of this utility model.

[0022] Figure 5 This utility model Figure 2 A magnified view of a portion of point A in the middle.

[0023] [Explanation of Key Component Symbols] 1. Steel sleeve assembly; 11. Arc-shaped steel sleeve unit; 12. Connecting assembly; 13. Flow guide channel; 131. Longitudinal main channel; 132. Transverse sub-channel; 14. Injection hole; 141. One-way check valve core; 15. Mechanical anchoring structure; 151. Dovetail ring rib; 152. Locking groove; 16. Overlap edge; 161. Sealing strip groove; 2. Sealing medium layer; 3. Pipe to be repaired. Detailed Implementation

[0024] The structure of this crack arrestor suitable for high-strength gas pipelines will be further described in detail below with reference to the accompanying drawings and embodiments of this utility model.

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments as described in this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0027] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0028] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 9 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0029] As per the instruction manual Figures 1-5 As shown, this utility model provides a technical solution: A crack arrestor for high-strength gas pipelines includes a steel sleeve assembly 1 and a sealing medium layer 2. The steel sleeve assembly 1 is composed of several arc-shaped steel sleeve units 11 spliced ​​together by connecting components 12, and is fitted around the cracked area of ​​the pipeline 3 to be repaired to provide rigid support and inhibit crack propagation. The sealing medium layer 2 fills the gap between the steel sleeve assembly 1 and the pipeline 3 for sealing and buffering. Furthermore, the outer side of the steel sleeve assembly 1 is covered with a... Composite material layers are used to provide flexible constraints and corrosion-resistant protection.

[0030] In one specific implementation, such as Figure 3 and Figure 4 As shown, several interconnected guide grooves 13 are formed on the inner wall of the arc-shaped steel sleeve unit 11 of the steel sleeve assembly 1. These guide grooves 13 form a grid-like distribution on the inner surface of the arc-shaped steel sleeve unit 11 to guide the sealant to flow evenly. At the same time, at least one injection hole 14 penetrating the pipe wall is provided on the arc-shaped steel sleeve unit 11. One end of the injection hole 14 is connected to the outside of the arc-shaped steel sleeve unit 11, and the other end is connected to the guide groove 13 on the inner wall, which facilitates the injection of sealant from the outside.

[0031] In one specific implementation, such as Figure 3 and Figure 4 As shown, the flow guide trough 13 includes a longitudinal main trough 131 extending along the axial direction of the pipe and a transverse branch trough 132 extending along the circumference of the pipe. The longitudinal main trough 131 and the transverse branch trough 132 are intersected and connected to each other to form an efficient flow network.

[0032] Specifically, the cross-sectional shape of the guide channel 13 is semi-circular or trapezoidal, for example, semi-circular to reduce flow resistance.

[0033] Specifically, the injection hole 14 is located at the intersection of the longitudinal main groove 131 and the transverse sub-groove 132 to ensure rapid diffusion of the sealant.

[0034] Specifically, a one-way check valve core 141 is installed inside the injection hole 14. The one-way check valve core 141 is configured to allow the sealant to flow from the outside of the steel sleeve assembly 1 to the inner wall and prevent the sealant from flowing back out, thereby achieving a pressure holding effect and preventing media backflow during the injection process. This structure works by mechanical limiting. When the injection pressure is greater than the spring preload of the valve core 141, the valve core 141 opens and automatically closes after the injection is completed.

[0035] In one specific implementation, such as Figure 1 , Figure 2 and Figure 3As shown, the sealing medium layer 2 is composed of a curable sealant that is injected under high pressure through the injection hole 14 and fills the gap between the guide groove 13 and the steel sleeve assembly 1 and the pipe 3. For example, an epoxy resin-based sealant is used. After injection, the sealant cures to form a continuous sealing layer, providing waterproof and anti-corrosion functions, and enhances the fit between the steel sleeve assembly 1 and the pipe 3 by filling the gap, thus avoiding local stress concentration.

[0036] In one specific implementation, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, several mechanical anchoring structures 15 protrude from the outer wall of the arc-shaped steel sleeve unit 11. These mechanical anchoring structures 15 are used to enhance the bond with the composite material layer. The composite material layer is tightly fitted and covers the outer wall of the arc-shaped steel sleeve unit 11 and the mechanical anchoring structures 15, and the matrix material of the composite material layer fills and wraps the gaps in the mechanical anchoring structures 15, forming a macroscopic mechanical interlocking connection between the steel sleeve assembly 1 and the composite material layer, thereby improving the peel resistance.

[0037] Specifically, the mechanical anchoring structure 15 includes dovetail-shaped ring ribs 151 continuously distributed circumferentially along the arc-shaped steel sleeve unit 11. The top width of the dovetail-shaped ring ribs 151 is greater than the root width, thereby forming an inverted trapezoidal locking groove 152 between adjacent dovetail-shaped ring ribs 151. After the composite material layer is cured, it is embedded in the locking groove 152 to limit radial separation. This design enhances the interface strength through the geometric locking principle and prevents the composite material layer from falling off under load.

[0038] Specifically, the surface of the dovetail-shaped ring rib 151 is also provided with knurled texture or microporous structure, such as knurled texture to increase the contact area and micro-friction with the composite material layer; this surface treatment can improve the bonding force and promote resin penetration during the curing process of the composite material layer, forming a stronger micro-interlock.

[0039] In one specific implementation, such as Figure 1 , Figure 2 and Figure 5 As shown, a stepped overlapping edge 16 is provided at the connection of adjacent arc-shaped steel sleeve units 11, and adjacent overlapping edges 16 are connected by connecting components 12. A sealing strip groove 161 is provided on the stepped overlapping edge 16 for placing a sealing strip during splicing, forming a labyrinthine sealing fit. This structure prevents media penetration through multiple steps, ensuring the sealing performance at the splice and facilitating alignment during assembly.

[0040] Specifically, stress relief chamfers are provided at both ends of the steel sleeve assembly 1. The wall thickness of the stress relief chamfers gradually decreases outward along the axial direction, so that the radial stiffness of the end of the steel sleeve assembly 1 decreases in a gradient, so as to smoothly transition the stiffness difference between the steel sleeve assembly 1 and the pipe 3, reduce stress concentration at the end, and avoid the generation of secondary cracks.

[0041] In terms of working principle, the crack arrester provides rigid constraint through the steel sleeve assembly 1, the sealing medium layer 2 fills and seals the gap, and the composite material layer enhances the overall toughness through mechanical interlocking. When the pipeline 3 is subjected to internal pressure, crack propagation is inhibited by the steel sleeve assembly 1, while the sealing medium layer 2 prevents leakage and the composite material layer absorbs deformation energy to ensure long-term stability.

[0042] This synergistic effect solves the problem of easy separation at the interface of traditional crack arresters, achieves uniform sealing through the glue injection structure, and improves durability through mechanical locking.

[0043] As an alternative, the cross-section of the guide channel 13 can be trapezoidal to enhance structural strength, and the number of the injection holes 14 can be adjusted to 2-4 according to the pipe diameter to accommodate pipes of different sizes.

[0044] As an alternative, the mechanical anchoring structure 15 may use helical ribs instead of dovetail ring ribs 151 to provide bidirectional locking in both axial and circumferential directions, suitable for applications with large vibration loads.

[0045] Example 1: For the repair of cracks in a 300mm diameter high-pressure natural gas pipeline, three arc-shaped steel sleeve units 11 are spliced ​​together to form a steel sleeve assembly 1, made of Q345 steel with a thickness of 10mm; the guide channel 13 has a semi-circular cross section, with longitudinal main channels 131 spaced 50mm apart and transverse sub-channels 132 spaced 30mm apart; two injection holes 14 are provided, for installing one-way check valve cores 141; the mechanical anchoring structure 15 is a dovetail-shaped ring rib 151, 5mm high, spaced 20mm apart, with a knurled surface; the stepped overlapping edge 16 has two steps, and the sealing strip groove 161 is 2mm wide; the stress relief chamfer is 50mm long, and the wall thickness gradually decreases from 10mm to 5mm.

[0046] During installation, first, the arc-shaped steel sleeve unit 11 is spliced ​​and fixed to the cracked area of ​​the pipe 3 through the connecting component 12; then, epoxy sealant is injected through the injection hole 14 to form the sealing medium layer 2; finally, carbon fiber reinforced epoxy composite material is wrapped around to form a composite material layer with a thickness of 8mm to ensure that the mechanical anchoring structure 15 is covered.

[0047] In this embodiment, the crack arrester is lightweight and requires no hot work for installation. Tests show that its axial strength is ≥400MPa, its pressure resistance is ≥10MPa, and its sealing performance is leak-free after a 500-hour salt spray test, fully demonstrating the synergistic advantages of the glue injection structure and mechanical locking.

[0048] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model.

Claims

1. A crack arrestor suitable for high-strength gas pipelines, characterized in that, The system includes a steel sleeve assembly (1) and a sealing medium layer (2). The steel sleeve assembly (1) is formed by splicing several arc-shaped steel sleeve units (11) through connecting components (12) and is fitted around the cracked area of ​​the pipe (3) to be repaired. The sealing medium layer (2) fills the steel sleeve assembly (1) and the pipe (3). Several interconnected guide grooves (13) are provided on the inner wall of the arc-shaped steel sleeve unit (11). The guide grooves (13) form a grid distribution on the inner surface of the arc-shaped steel sleeve unit (11). At least one glue injection hole (14) penetrating the pipe wall is provided on the arc-shaped steel sleeve unit (11). One end of the glue injection hole (14) is connected to the outside of the arc-shaped steel sleeve unit (11), and the other end is connected to the guide groove (13) on the inner wall.

2. A crack arrestor for high-strength gas pipelines as described in claim 1, characterized in that, The cross-sectional shape of the guide channel (13) is semi-circular or trapezoidal.

3. A crack arrestor suitable for high-strength gas pipelines as described in claim 1 or 2, characterized in that, The flow channel (13) includes a longitudinal main channel (131) extending along the axial direction of the pipe and a transverse branch channel (132) extending along the circumference of the pipe. The longitudinal main channel (131) and the transverse branch channel (132) are intersecting and connected to each other to form a flow network.

4. A crack arrestor suitable for high-strength gas pipelines as described in claim 3, characterized in that, The glue injection hole (14) is located at the intersection of the longitudinal main groove (131) and the transverse sub-groove (132).

5. A crack arrestor suitable for high-strength gas pipelines as described in claim 1, characterized in that, A one-way check valve core (141) is installed inside the injection hole (14), which allows sealant to flow from the outside of the steel sleeve assembly (1) to the inside wall.

6. A crack arrestor suitable for high-strength gas pipelines as described in claim 1, characterized in that, The sealing medium layer (2) is composed of a curable sealant that is injected under high pressure through the injection hole (14) and fills the gap between the guide groove (13) and the steel sleeve assembly (1) and the pipe (3).

7. A crack arrestor for high-strength gas pipelines as described in claim 1, characterized in that, The outer wall of the arc-shaped steel sleeve unit (11) is provided with a number of mechanical anchoring structures (15). The mechanical anchoring structure (15) includes dovetail-shaped ring ribs (151) continuously distributed along the circumference of the arc-shaped steel sleeve unit (11). Locking grooves (152) are formed between adjacent dovetail-shaped ring ribs (151). The locking grooves (152) match the composite material layer.

8. A crack arrestor for high-strength gas pipelines as described in claim 1, characterized in that, A stepped overlapping edge (16) is provided at the connection of adjacent arc-shaped steel sleeve units (11), and adjacent stepped overlapping edges (16) are connected by a connecting component (12).

9. A crack arrestor for high-strength gas pipelines as described in claim 8, characterized in that, A sealing strip groove (161) is provided on the stepped overlapping edge (16), and the sealing strip groove (161) matches the sealing strip.

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