Modularized splicing type non-welding pipeline repairing sleeve

Abstract

The utility model relates to the technical field of design and construction of steel sleeves for non-welding repair in pipeline defect repair, in particular to a modular splicing type non-welding pipeline repair sleeve. The modular splicing type non-welding pipeline repairing sleeve comprises a net-shaped base and reinforcing blocks, the net-shaped base surrounds a pipeline to be repaired, the two ends of the net-shaped base are overlapped and fixedly connected with each other, and the reinforcing blocks are embedded in meshes of the net-shaped base. The inner surface and the outer surface of the net-shaped base are coated with structural adhesives respectively, the inner surface is bonded with a to-be-repaired pipeline through the structural adhesives, and gaps between the reinforcing blocks and the meshes are filled with the structural adhesives. The device has the advantages of being simple and reasonable in structural design, capable of achieving the characteristics of convenient installation and high safety performance during on-site repair operation, low in manpower resource consumption and low in construction cost.

Description

Technical Field

[0001] The utility model relates to the technical field of the design and construction of steel sleeves for non-welding repair in pipeline defect repair, and particularly relates to a modular spliced non-welding pipeline repair sleeve. Background Technique

[0002] There are many methods for pipeline repair, including composite material repair, epoxy steel sleeve repair, pipe replacement repair, welding and patch repair, lining and mechanical fixture repair, etc. Before planning the repair, it is necessary to evaluate the effectiveness, long-term performance, reliability, safety and cost of different pipeline repair schemes according to the pipeline conditions of its own, so as to determine the most suitable repair scheme.

[0003] At present, in the actual production site, most pipeline companies unanimously believe that using composite material steel sleeves for pipeline defects is a relatively economical and effective repair scheme. However, there are more risk factors in the composite steel sleeve repair operation on in-service pipelines, especially for the composite steel sleeve repair of high-grade large-diameter pipelines. Further research and breakthroughs are still needed by scientific research workers in related fields. As a typical non-welding repair technology, the composite material steel sleeve pipe body defect repair technology winds fiber composite materials manually on the outside of the pipeline. After the resin is cured, the composite material is tightly combined with the defective pipeline and deforms synergistically. At the same time, a steel sleeve is used for fastening and strengthening to distribute the stress of the defective pipeline reasonably, so as to achieve the purpose of reinforcement. The composite material steel sleeve repair technology has been widely used in the pipeline defect repair in actual production because it does not require hot work, and the construction operation is convenient and flexible. However, there are still certain problems in the related technology, such as difficult construction under the trench, sleeve corrosion and composite material aging problems, difficult sleeve construction and installation operation, hoisting construction operation problems and construction safety, etc.

[0004] Based on this, there is an urgent need for a modular spliced non-welding pipeline repair sleeve to enable on-site repair operations to achieve the purposes of convenient installation, high safety performance and less consumption of human resources. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a modular spliced non-welding pipeline repair sleeve, which effectively overcomes the defects of the prior art.

[0006] The technical solution of the utility model to solve the above technical problems is as follows:

[0007] A modular spliced non-welded pipe repair sleeve, comprising a mesh base and reinforcing blocks. The mesh base surrounds the pipe to be repaired, and the two end portions overlap and are fixedly connected to each other. The reinforcing blocks are embedded in each mesh of the mesh base. Structural adhesives are respectively coated on the inner surface and the outer surface of the mesh base, and the inner surface is adhered to the pipe to be repaired through the structural adhesive. The structural adhesive fills the gaps between each reinforcing block and the mesh.

[0008] Based on the above technical solution, the present utility model can be further improved as follows.

[0009] Further, the mesh base is a rectangular strip-shaped base.

[0010] Further, the mesh base is a flexible steel base or a base made of composite materials.

[0011] Further, the reinforcing blocks are components prepared from alloy steel, ultra-low carbon steel or high-strength organic materials.

[0012] Further, the meshes are arranged in a matrix on the mesh base.

[0013] Further, the reinforcing blocks are in interference fit with the meshes, or are riveted or bolted.

[0014] Further, convex blocks are provided on the outer surface of the reinforcing blocks, and the convex blocks between adjacent reinforcing blocks in the circumferential direction are connected by connecting pieces.

[0015] Further, the connecting piece is a bolt.

[0016] Further, the connecting piece is a cable, the cable penetrates through a plurality of the convex blocks in a circle in the circumferential direction, and the two end portions of the cable are fixedly connected to each other.

[0017] Further, a carbon fiber cloth or a glass fiber cloth pre-impregnated with epoxy resin is wound and bound on the outer surface of the mesh base.

[0018] The beneficial effects of the present utility model are: the structural design is simple and reasonable, the on-site repair operation can achieve the characteristics of convenient installation and high safety performance, the consumption of human resources is small, and the construction cost is reduced. Description of the Drawings

[0019] Figure 1 It is a structural schematic diagram of the modular spliced non-welded pipe repair sleeve of the present utility model;

[0020] Figure 2 It is a structural schematic diagram of the modular spliced non-welded pipe repair sleeve of the present utility model when used for repairing on a pipe.

[0021] In the drawings, the list of components represented by each reference numeral is as follows:

[0022] 1. Mesh base; 2. Reinforcing block. Specific embodiments

[0023] The principles and features of the present utility model will be described below in conjunction with the accompanying drawings. The examples given are only used to explain the present utility model and are not intended to limit the scope of the present utility model.

[0024] Example: As Figure 1 and 2 shown, the modular spliced non-welded pipe repair sleeve of this embodiment includes a mesh base 1 and a reinforcing block 2. The above-mentioned mesh base 1 surrounds the outside of the pipe to be repaired, and the two ends are overlapped and fixedly connected to each other. The above-mentioned reinforcing block 2 is embedded in each mesh (designated by A in the figure) of the above-mentioned mesh base 1. Structural adhesives are respectively coated on the inner surface and the outer surface of the above-mentioned mesh base 1, and the inner surface is adhered to the pipe to be repaired through the structural adhesive. The above-mentioned structural adhesive fills the gaps between each of the above-mentioned reinforcing blocks and the meshes.

[0025] The installation process of the modular spliced non-welded pipe repair sleeve of this embodiment is specifically as follows:

[0026] First step: Use lifting facilities to install the mesh base 1 on the pipe wall to be repaired. The connecting ends at both ends of the mesh base 1 are fastened by a connecting structure hinge, and the excess base part is cut off.

[0027] Second step: Adjust the position of the mesh base 1 so that the direction of the reinforcing block 2 embedded in the mesh (hollow area) on the surface of the mesh base 1 is tangent to the radial normal of the pipe.

[0028] Third step: Adopt a manual operation method to install the reinforcing blocks 2 into the meshes in sequence from the 12 o'clock direction of the pipe. The two sides of the mesh base 1 are installed simultaneously until they converge at the 6 o'clock direction of the pipe.

[0029] Fourth step: Connect the reinforcing blocks 2 to each other.

[0030] Fifth step: Apply structural adhesive by brushing so that the structural adhesive fills the positions between the mesh base 1, the reinforcing block 2, and the pipe wall.

[0031] In the above steps, the excess base part is cut off by one of the methods of cutting with scissors, burning with a flame, cutting with a rotary cutter, gradually cutting with a circular cutter, and assisting with a pipe cutting machine.

[0032] In the overall design, the reticular base 1 adopts a reticular base 1 with evenly distributed meshes, and the overall mass is greatly reduced. Compared with the traditional two semi-circular repair cylinders, it can significantly reduce the difficulty of hoisting and subsequent construction, reduce the error of the end splicing of the traditional repair cylinder, the overall structural design is simple and reasonable, and the on-site repair operation can achieve the characteristics of convenient installation and high safety performance, with less consumption of human resources and reduced construction costs.

[0033] In this embodiment, the above-mentioned reticular base 1 is a rectangular strip-shaped base.

[0034] More specifically, the above-mentioned reticular base 1 is a flexible steel base or a base made of composite materials. Among them, the flexible steel is composed of one or several of steel wire ropes, spiral steel wire bundles, diamond-shaped wire rope nets, annular nets, and high-strength steel wire grids, and the maximum elastic bending angle is 60° - 90°. The composite materials include at least two of synthetic resins, rubbers, graphite sheets, carbon fiber sheets, glass fibers, carbon fibers, boron fibers, aramid fibers, silicon carbide fibers, asbestos fibers, etc.

[0035] In this embodiment, the above-mentioned reinforcing block 2 is a component prepared from alloy steel, ultra-low carbon steel or high-strength organic materials. Among them, alloy steel and ultra-low carbon steel are collectively referred to as high-strength steel, which refers to alloy steel or ultra-low carbon steel with a yield strength above 580 MPa and a tensile strength above 600 MPa. High-strength organic materials refer to one or several of polyvinyl chloride, glass fiber reinforced composite plastics, carbon fiber reinforced composite plastics, boron fiber reinforced composite plastics, ABS resin, polyoxymethylene thermoplastic crystalline polymer, PA46 (polyhexamethylene adipamide), and LCP engineering plastics. Their corresponding tensile yield strength ≥ 100 MPa, tensile modulus ≥ 2000 MPa, elongation at break ≤ 2%, flexural modulus ≥ 3000 MPa, and flexural strength ≥ 150 MPa.

[0036] In this embodiment, the above-mentioned meshes are distributed in a matrix on the above-mentioned reticular base 1.

[0037] In this embodiment, the above-mentioned reinforcing block 2 is in interference fit with the mesh, or is riveted or bolted, and can also be connected by hinge connection, serrated bite connection, brush surface paste connection, wave key connection, sealed screw connection, thermal interference fit connection, universal joint connection, or flat key connection.

[0038] In this embodiment, the outer surface of the above-mentioned reinforcing block 2 is provided with convex blocks, and the convex blocks between the adjacent above-mentioned reinforcing blocks 2 in the circumferential direction are connected by connecting pieces. Ensure the mutual connection between the reinforcing blocks 2 and improve the structural strength.

[0039] In this embodiment, the above-mentioned connecting piece is a bolt, that is, the reinforcing blocks 2 are bolted together. Of course, it can also be connected by riveting, pin hinge connection, or bolt connection.

[0040] Of course, the connecting member may also be a cable, which runs through a circle of the plurality of protrusions in the circumferential direction, and both ends of the cable are connected and fixed to each other.

[0041] In this embodiment, the structural adhesive adopts a two-component epoxy resin material with a shear strength of ≥20MPa, a compressive strength of ≥50MPa, and an adhesion to steel of ≥25MPa after solid drying. The curing time is ≥40 minutes, the density is between 1.2 and 1.7, the hardness is 80 or above Shore D, and the freeze-thaw cycle is -30℃-0℃-30℃, 200h without change.

[0042] In this embodiment, after being coated with structural adhesive, the outer surface of the mesh base 1 is wrapped and bound with carbon fiber cloth or glass fiber cloth pre-impregnated with epoxy resin, ensuring that the entire repair tube is well sealed and repaired outside the pipeline, and the overall structural strength is high, with good insulation, heat resistance, and corrosion resistance.

[0043] Among them, the performance of pre-impregnated epoxy resin is a two-component epoxy resin material with shear strength ≥18MPa, compressive strength ≥45MPa, and adhesion to steel ≥20MPa. Its curing time is ≥60 minutes, density is between 1.3-1.8, curing hardness is 70 and above Shore D, and freeze-thaw cycle is -30℃-0℃-30℃, 200h without change.

[0044] The following is a specific experimental example to illustrate the operation of the modular splicing non-welded pipeline repair sleeve of this embodiment:

[0045] A natural gas pipeline of a pipeline company has an outer diameter of 1016mm and is made of X70 pipe steel. A 43% unfused weld defect was found at a certain location. After approval and filing, the pipeline was shut down and emptied to replace natural gas. Then the trench was excavated, and the surface PE anti-corrosion layer and epoxy resin were removed by medium frequency heating equipment. The residual epoxy resin and part of the rust on the pipe wall were removed by sandblasting to generate a silver-white steel surface with a surface roughness of Ra2.5. After rust removal, the surface was purged with air, and solvents such as anhydrous ethanol were used to remove surface oil stains. At this time, the surface treatment requirements for repair were met, and the surface repair was completed within 4-8 hours to prevent rust.

[0046] When repairing with the modular spliced non-welded pipeline repair sleeve of this embodiment, first wind the flexible steel mesh base 1 around the defective part with an axial length of 1.2 m, tighten it with a tool, and cut off the excess base with wire shears. The lap joint at the connection is 100 mm, and it is fixed by spot welding. Adjust the position of the mesh base 1 so that the direction of installing the reinforcement block 2 in the mesh of the base surface is tangent to the radial normal of the pipeline. Employ multiple construction workers, distribute them on both sides of the repair cylinder, and install and fasten the reinforcement blocks 2 in sequence from the 12 o'clock direction of the pipeline. Install them on both sides of the pipeline simultaneously until they converge at the 6 o'clock direction of the pipeline. Connect and fasten the reinforcement blocks 2 to each other by means of a pin hinge. Prepare a two-component epoxy structural adhesive and apply it to the repair cylinder within the working time so that the structural adhesive fills the positions between the mesh base 1, the reinforcement block 2, and the pipe wall. Wind a carbon fiber cloth pre-impregnated with epoxy resin on the outside of the installed modular spliced non-welded pipeline repair sleeve. After the repair is completed, use a polyethylene cold wrap tape to anticorrode the remaining positions of the sandblasting on both sides, and backfill the operation trench.

[0047] The construction operation of the above experimental example is simple, the technological steps are few, and the applicability is strong. The bending resistance of its repair layer is restored by 100%, and the internal pressure resistance of the repaired pipeline exceeds the yield strength of the pipeline. Moreover, the construction is rapid, the installation process is simple and safe, and it can provide a new non-welded repair technology method and technological means for the pipeline body defect repair industry, especially for high-grade large-diameter pipelines.

[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0049] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0050] In the present utility model, unless otherwise clearly defined or limited, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0051] In the present utility model, unless otherwise clearly defined or limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0052] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0053] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present utility model.

Claims

1. A modular spliced non-welded pipeline repair sleeve, characterized in that: It includes a mesh base (1) and reinforcing blocks (2). The mesh base (1) surrounds the pipeline to be repaired, and the two ends are overlapped and fixedly connected to each other. The reinforcing blocks (2) are embedded in each mesh of the mesh base (1). Structural adhesives are respectively coated on the inner surface and the outer surface of the mesh base (1), and the inner surface is adhered to the pipeline to be repaired through the structural adhesive. The structural adhesive fills the gaps between each reinforcing block (2) and the mesh.

2. The modular spliced non-welded pipe repair sleeve according to claim 1, wherein: The mesh base (1) is a rectangular strip-shaped base.

3. The modular spliced non-welded pipe repair sleeve according to claim 2, wherein: The mesh base (1) is a flexible steel base or a base made of composite materials.

4. A modular spliced non-welded pipeline repair sleeve according to claim 2, characterized in that: The reinforcing blocks (2) are components made of alloy steel, ultra-low carbon steel or high-strength organic materials.

5. The modular spliced non-welded pipe repair sleeve according to claim 2, characterized in that: The meshes are distributed in a matrix on the mesh base (1).

6. The modular spliced non-welded pipe repair sleeve according to claim 1, wherein: The reinforcing blocks (2) are in interference fit with the meshes, or are riveted or bolted.

7. A modular spliced non-welded pipe repair sleeve according to claim 6, characterized in that: The outer surface of the reinforcing block (2) is provided with bumps, and the bumps between the adjacent reinforcing blocks (2) in the circumferential direction are connected by connecting pieces.

8. A modular spliced non-welded pipeline repair sleeve according to claim 7, characterized in that: The connecting piece is a bolt.

9. A modular spliced non-welded pipeline repair sleeve according to claim 7, characterized in that: The connecting piece is a cable. The cable passes through a plurality of the bumps in a circle in the circumferential direction, and the two ends of the cable are fixedly connected to each other.

10. A modular spliced non-welded pipe repair sleeve according to any one of claims 1 to 9, characterized in that: The outer surface of the mesh base (1) is wound and tied with a carbon fiber cloth or a glass fiber cloth pre-impregnated with epoxy resin.

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