Composite lining structure for pipeline repair

Abstract

The utility model relates to a composite lining structure for repairing a pipeline. The composite lining structure is provided with a repairing sheet body which is adhered and fixed at a damaged part of the pipeline, the repair patch body sequentially comprises a glass fiber layer, a strong core felt layer and a carbon fiber layer from the outer layer to the inner layer; the glass fiber layer is adhered and fixed with the inner wall of the pipeline through the resin bonding layer, or the glass fiber layer is adhered and fixed with the inner wall of the pipeline after being infiltrated with resin; the core-strengthening felt layer is adhered and fixed with the glass fiber layer after being infiltrated with resin; the carbon fiber layer is adhered and fixed with the strong core felt layer after being infiltrated with resin; the repairing patch body is adhered and fixed at the damaged part of the pipeline to form a cylindrical barrel. The water-proof and anti-seepage wall is light in weight, small in adhesive consumption, capable of achieving the effects of resisting negative pressure, underground water pressure and internal water pressure, and meanwhile good in anti-seepage performance, corrosion resistance and abrasion resistance.

Description

Technical Field

[0001] The utility model relates to the field of pipeline repair, in particular to a composite lining structure for pipeline repair. Background Art

[0002] Pipelines are a vital component of modern infrastructure, transporting water, oil, natural gas, and other liquids and gases. Over time, pipelines can become damaged by various factors, such as corrosion, wear, external pressure, and environmental factors. Therefore, the development of pipeline repair technologies is crucial to safeguarding energy supply, water security, and environmental sustainability.

[0003] Currently, trenchless repair is commonly used in pipeline repair. Trenchless repair involves excavating and replacing damaged pipe sections. This method is costly, time-consuming, and potentially damaging to the surrounding environment. It is only used in cases of severe pipeline damage. Pipeline damage is often limited to small areas, making trenchless repair more suitable in these cases. Trenchless repair generally includes CIPP (Concrete In-Pipe Lining Process), pipe intubation repair, and pipe repair patching.

[0004] Among them, the pipeline repair patch technology uses special repair patches to quickly repair local damage to the pipeline. These patches can be prefabricated or formed on site, and can quickly seal leaks and prevent further damage. When repairing, it is generally done by sticking glass fiber soaked or coated with adhesive to the damaged part of the pipeline, and then heating and curing to complete the repair. At the same time, to ensure that there is no leakage at the later repair site, it is often necessary to set up multiple layers of glass fiber layers, or fold the glass fiber and then attach it. However, the overall weight of glass fiber is heavier, so in order to ensure the bonding strength and the later leak-proof requirements, more adhesive is often required. At the same time, the increase in the amount of adhesive used will lead to an increase in the overall thickness of the repair patch and a reduction in the inner diameter of the pipeline.

[0005] Therefore, it is a technical problem that needs to be solved urgently to design a repair patch that is light in weight, uses little adhesive, and can also improve the anti-seepage ability, corrosion resistance and wear resistance of the repaired part. Utility Model Content

[0006] The purpose of the utility model is to provide a composite lining structure for pipeline repair, which is light in weight, uses a small amount of adhesive, and can also improve the anti-seepage ability, corrosion resistance and wear resistance of the repaired part.

[0007] The technical solution for achieving the purpose of the utility model is as follows: the utility model has a patch body for pasting and fixing to a damaged part of a pipe; the patch body includes a glass fiber layer, a strong core felt layer and a carbon fiber layer in sequence from the outer layer to the inner layer; the glass fiber layer is pasted and fixed to the inner wall of the pipe through a resin bonding layer, or the glass fiber layer is pasted and fixed to the inner wall of the pipe after being impregnated with resin; the strong core felt layer is pasted and fixed to the glass fiber layer after being impregnated with resin; the carbon fiber layer is pasted and fixed to the strong core felt layer after being impregnated with resin; after the patch body is pasted and fixed to the damaged part of the pipe, a cylindrical body is formed.

[0008] Furthermore, the patch body further comprises a resin coating layer; the resin coating layer is coated on the carbon fiber layer.

[0009] Furthermore, the resin bonding layer is a two-component epoxy resin.

[0010] Furthermore, the glass fiber layer is ECR glass fiber fabric.

[0011] Furthermore, the carbon fiber layer is a unidirectional carbon fiber fabric.

[0012] Furthermore, the carbon fiber layer extends beyond the glass fiber layer and the strong core felt layer at the edges at both ends of the cylinder, and the extending portion covers the edges of the corresponding sides of the glass fiber layer and the strong core felt layer and is then glued and fixed to the inner wall of the pipe.

[0013] Furthermore, the resin coating layer completely fills the gaps and recessed portions of the carbon fiber layer and forms a smooth solidified surface on the surface of the carbon fiber layer.

[0014] Furthermore, protective ring bodies are symmetrically provided at both ends of the cylinder; the protective ring bodies include annular pressing grooves for covering the two end edges of the cylinder formed by the patch, and annular adhesive edges bonded and fixed to the inner wall of the pipe; the annular adhesive edges naturally transition from the annular pressing grooves to the inner wall of the pipe and form a guide slope; the annular pressing grooves are bonded and fixed to the patch body.

[0015] The utility model has positive effects: (1) The utility model utilizes a strong core felt layer to effectively reduce the thickness of the glass fiber layer, thereby reducing weight, reducing costs, and improving efficiency while ensuring the rigidity of the repair piece itself; at the same time, the weight of the strong core felt is 50%-60% of that of solid glass fiber reinforced plastics of the same thickness. By using the strong core felt, the amount of resin used is greatly reduced, and the cost advantage is obvious.

[0016] (2) The utility model adds a carbon fiber layer. Carbon fiber is a high-strength and lightweight material that is fully compatible with resin and can be well bonded. It has good corrosion resistance and wear resistance.

[0017] (3) The resin coating layer in the present invention mainly serves to improve the surface roughness of the composite lining structure, reduce the surface friction coefficient, and improve the anti-seepage ability of the lining structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings, wherein

[0019] Figure 1 This is a schematic structural diagram of the repair piece body in the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the carbon fiber layer coating in the present invention;

[0021] Figure 3 This is a schematic diagram of the installation of the protective ring body in Example 2 of the present utility model. DETAILED DESCRIPTION

[0022] (Example 1)

[0023] See Figure 1 The utility model is mainly aimed at the water supply and drainage pipes of DN800 and above, and installs the composite lining structure from the inside. The composite lining structure has a patch body for pasting and fixing it to the damaged part of the pipe; the patch body includes a glass fiber layer 1, a strong core felt layer 2 and a carbon fiber layer 3 from the outer layer to the inner layer; the glass fiber layer 1 is pasted and fixed to the inner wall of the pipe through a resin bonding layer 4; the resin bonding layer 4 adopts a two-component epoxy resin, and generally a two-component epoxy resin with high strength structure can be selected; the resin bonding layer 4 is smoothed by hand and has high viscosity.

[0024] The core felt layer 2 is fixed to the glass fiber layer 1 after being impregnated with resin; the carbon fiber layer 3 is fixed to the core felt layer 2 after being impregnated with resin; the patch body is fixed to the damaged part of the pipe to form a cylindrical body.

[0025] The core felt layer 2 is a felt-like material mainly composed of polyester fiber or glass fiber and microspheres, and bonded into an integral body by a styrene-soluble adhesive. The use of the core felt layer 2 can significantly improve the rigidity of the patch body after late curing.

[0026] The patch body also includes a resin coating layer 5, which is applied to the carbon fiber layer 3. This layer fills the gaps and recesses within the carbon fiber layer 3 and forms a smooth, solidified surface. This improves the surface roughness of the composite lining structure, reduces surface friction, and enhances the lining's impermeability.

[0027] The glass fiber layer 1 is ECR glass fiber fabric.

[0028] The carbon fiber layer 3 is a unidirectional carbon fiber fabric.

[0029] See Figure 2 The carbon fiber layer 3 extends beyond the glass fiber 1 and the strong core felt layer 2 at the edges at both ends of the cylinder, and the extending portion covers the edges of the corresponding sides of the glass fiber layer 1 and the strong core felt layer 2 and is then glued and fixed to the inner wall of the pipe.

[0030] (Example 2)

[0031] See Figure 3 The utility model is symmetrically provided with protective ring bodies 7 at both ends of the cylinder; the protective ring bodies 7 include annular pressing grooves 71 for covering the two end edges of the cylinder formed by the patch body, and annular adhesive edges 72 bonded and fixed to the inner wall of the pipe; the annular adhesive edges 72 naturally transition from the annular pressing grooves 71 to the inner wall of the pipe and form a guide slope 73; the annular pressing grooves 71 are bonded and fixed to the patch body.

[0032] Other technical features are the same as those in Example 1.

[0033] (Example 3)

[0034] In the present invention, the glass fiber layer 1 is directly adhered and fixed to the inner wall of the pipe after being impregnated with resin, and the laying method adopts manual laying.

[0035] Other technical features are the same as those in Example 1.

[0036] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A composite lining structure for pipeline repair, comprising a patch body for being adhered and fixed to a damaged portion of the pipeline; characterized in that: The patch body includes, from the outer layer to the inner layer, a glass fiber layer, a strong core felt layer and a carbon fiber layer in sequence; the glass fiber layer is adhered and fixed to the inner wall of the pipe through a resin bonding layer, or the glass fiber layer is adhered and fixed to the inner wall of the pipe after being impregnated with resin; the strong core felt layer is adhered and fixed to the glass fiber layer after being impregnated with resin; the carbon fiber layer is adhered and fixed to the strong core felt layer after being impregnated with resin; the patch body is adhered and fixed to the damaged part of the pipe to form a cylindrical body.

2. The composite lining structure for pipeline repair according to claim 1, characterized in that: The patch body further comprises a resin coating layer; the resin coating layer is coated on the carbon fiber layer.

3. The composite lining structure for pipeline repair according to claim 1, characterized in that: The resin bonding layer is a two-component epoxy resin.

4. The composite lining structure for pipeline repair according to claim 1, characterized in that: The glass fiber layer is ECR glass fiber fabric.

5. The composite lining structure for pipeline repair according to claim 1, characterized in that: The carbon fiber layer is a unidirectional carbon fiber fabric.

6. The composite lining structure for pipeline repair according to claim 1, characterized in that: The carbon fiber layer extends beyond the glass fiber layer and the strong core felt layer at the edges of both ends of the cylinder, and the extending portion covers the edges of the corresponding sides of the glass fiber layer and the strong core felt layer and is then adhered and fixed to the inner wall of the pipe.

7. The composite lining structure for pipeline repair according to claim 2, characterized in that: The resin coating layer fills up the gaps and recessed parts of the carbon fiber layer and forms a smooth solidified surface on the surface of the carbon fiber layer.

8. A composite lining structure for pipeline repair according to claim 1 or 2 or 3 or 4 or 5 or 6 or 7, characterized in that: Protective ring bodies are symmetrically provided at both ends of the cylinder; the protective ring bodies include annular pressing grooves for covering the two end edges of the cylinder formed by the patch, and annular adhesive edges bonded and fixed to the inner wall of the pipe; the annular adhesive edges naturally transition from the annular pressing grooves to the inner wall of the pipe and form a guide slope; the annular pressing grooves are bonded and fixed to the patch body.

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