CN1276024C - Strengthening carbon fiber composite material and method for repairing defective pipeline - Google Patents

Abstract

The present invention relates to a repair and strengthening material for defective pipelines, particularly to metallic pipelines, and a method for repairing and strengthening the defective pipelines with the materials. The repair and strengthening material comprises a repair rubber layer, a carbon fibre sheet material layer and an anticorrosive material layer, wherein the repair rubber layer is used for repairing and leveling the defects outside of the pipelines, the carbon fibre sheet material layer is used for restoring and increasing the bearing strength of a pipe body at the defective position by coating or impregnating with sticky impregnating glue, and the anticorrosive material layer is coated on the outer surface. The specific strength and the specific modulus of the repair and strengthening material is similar to those of metallic pipe body materials, so the repair and strengthening material can integrate into the pipelines and jointly bear pressure in the pipelines, and the bearing capability of a composite repair layer finally formed can reach and exceed the bearing capability of an original pipeline. The method of the present invention has the advantage of convenient and simple construction, the repair and strengthening material is favorable to be tightly attached to pipe bodies and repair and strengthening layers, and the repair and strengthening materials can be used for repairing and strengthening the pipelines under the condition of without stopping transporting.

Description

Carbon fiber composite material and method for repairing and strengthening pipelines with defects

field of invention

The present invention relates to a technique for repairing and reinforcing defective pipelines, especially metal pipelines, with resin-based carbon fiber composite materials. More specifically, the present invention relates to reinforcement for repairing and reinforcing defective pipelines, especially metal pipelines containing defects A material, the material is a resin-based carbon fiber composite material, a method for repairing and reinforcing pipeline defects by using the material, and an application of the material and method in repairing and strengthening oil and gas transmission pipeline defects.

Background technique

Oil and gas pipeline transportation is one of the five major transportation industries. At present, my country's long-distance oil and gas pipelines alone have reached more than 30,000 kilometers. During the long-term service of these pipelines, due to the effects of formation pressure, soil corrosion, galvanic corrosion, and external force damage, accidents such as pipeline bursts and leakages occur, affecting the normal transportation of pipelines. Explosion and leakage accidents of oil and gas pipelines often occur at home and abroad. For example, in 1989, 1,024 people were injured or injured in a blast of the Ural gas pipeline in the former Soviet Union; A large number of on-site investigations show that more than 60% of the oil and gas pipelines in service in my country have entered the accident-prone period. Usually, when the defective oil and gas transmission pipelines are in operation, they often adopt the method of depressurization transportation, which not only affects the normal production operation, but also greatly increases the operation cost. Therefore, it is a goal pursued in this field to develop a reinforcing material and method with good effect and easy implementation. Among the existing repair and reinforcement technologies for external defects of oil and gas pipelines, there are mainly methods such as traditional welding scar repair and composite material reinforcement. Due to the risk of weld penetration and hydrogen embrittlement in the process of welding scar repair, it is generally not recommended to use this method, especially for non-stop gas pipelines. Resin-based composite materials have been used by foreign oil companies for pipeline reinforcement due to their excellent properties such as light weight, high strength, corrosion resistance, good durability, simple construction, and no impact on the appearance of the structure. For example, the composite material reinforcement technology of Clockspring Company in the United States uses isophthalic acid-type unsaturated polyester and E-glass fiber to form a sheet, which is wrapped on the surface of the metal pipe by dry laying method, and is used between layers. Epoxy adhesive bonding. There are two disadvantages of this technology: one is that during the construction process, it is impossible to ensure the close fit between the composite sheet and the pipe body, and between the layers of the composite sheet; the other is that the elastic modulus and strength of the glass fiber are relatively low. Low, so the thickness of the reinforcing layer will be thicker, which will cause certain difficulties for subsequent anti-corrosion, and the degree of improvement in the bearing capacity of the matrix is also very limited.

In recent years, there have been some reports on the use of carbon fibers to reinforce metal pipes for external damage defects, but no specific implementation has been disclosed.

Carbon fiber is known for its high strength and large modulus of elasticity, and is most suitable for use as a reinforcing material. Table 1 shows the performance comparison of carbon fiber cloth, carbon fiber resin composite material and X60 pipeline steel.

Table 1 Performance comparison of carbon fiber, carbon fiber composite material and X60 pipeline steel Tensile strength σ _b (MPa) Yield strength σ _s (MPa) Elastic modulus E(GPa) Elongation δ(%) Carbon fiber cloth (200g/m ² ) 3500 235 1.5 Carbon fiber cloth (300g/m ² ) 3500 235 1.5 Resin-based carbon fiber composites ≥2500 ≥210 ≥1.4 X60 steel 443 207 8-layer unidirectional glass cloth composite (Clock Spring) 414 34 1.5-2 4-layer glass cloth composite (Furmanite) 203.1-228 12-13

It can be seen from Table 1 that using carbon fiber as a reinforcing material has the following advantages:

1. The elastic modulus of resin-based carbon fiber composite material is equal to or greater than 210GPa, which is very close to the elastic modulus of steel 207GPa, which is very conducive to the coordinated deformation of carbon fiber composite material and steel, and is conducive to the load between steel and carbon fiber composite material. Uniform distribution, which is conducive to achieve the reinforcement effect.

2. The resin-based carbon fiber composite material has sufficient deformation, greater than 1.4%. Under normal circumstances, the deformation of the pipe body is much smaller than that of carbon fiber composite materials, and the use of carbon fiber composite materials for reinforcement is also safe enough from the perspective of pipe body deformation.

3. The strength of carbon fiber reinforced materials is an order of magnitude greater than that of glass fibers, which enables thinner carbon fiber composite materials to achieve the reinforcing effect that only thick glass fiber reinforced materials can have.

The purpose of the present invention is to develop a new technology of using carbon fiber for the reinforcement of pipelines with defects, especially metal pipelines. It is conducive to the tight fit between the reinforcing material and the pipe body, and between the reinforcing layer and the layer. It can be integrated with the pipe to jointly bear the pressure inside the pipe, and make the pressure bearing capacity of the final composite repair layer reach or exceed the original The pressure bearing capacity of the pipeline. The technology of the present invention can carry out reinforcement work without stopping the pipeline. During the construction process, no large-scale mechanical hoisting equipment is required, no welding or cutting of pipelines is required, the construction space requirement is very low, and it has corrosion resistance, aging resistance, etc. advantage.

Contents of the invention

The purpose of the present invention is to provide a resin-based carbon fiber composite material for repairing and reinforcing metal pipelines with defects, and the resin-based carbon fiber composite material includes carbon fiber sheets and the special resin of the present invention. Specifically, the resin-based carbon fiber composite material includes a carbon fiber sheet painted or impregnated with a sticky dipping glue.

Another object of the present invention is to provide a reinforcing material for repairing and reinforcing defective pipelines, which includes multiple layers of the resin-based carbon fiber composite material, and one or more layers outside the resin-based carbon fiber composite material. Anti-corrosion material outside the layer.

The term "pipe" as used herein refers to pipes made of various materials, especially metal pipes such as steel pipes.

The term "carbon fiber sheet" used herein includes carbon fiber sheets made of various raw materials, such as carbon fiber cloth. Preferably, the carbon fiber sheet used in the present invention has an elastic modulus in the range of (1.0-3.0)×10 ⁵ MPa, a tensile strength in the range of 2500-3500 MPa, an elongation δ in the range of 0.2-3.0%, and a weight per unit area in the range of 200-300g/m ² .

The term "resin-based carbon fiber composite material" as used herein refers to a composite and cured material of carbon fiber and resin.

The materials used in the invention for repairing and reinforcing defective pipelines include resin-based carbon fiber composite materials and external anticorrosion materials. The resin-based carbon fiber composite material includes carbon fiber sheets and special supporting resins.

The special supporting resin of the present invention includes two kinds of repairing glue and sticky dipping glue. The repair glue is used for filling and repairing the damaged defects outside the pipeline; the sticky dipping glue is used for impregnating carbon fiber sheets, and bonding between carbon fibers and pipe bodies, and between carbon fiber sheets. Repair glue and sticky dipping glue can be divided into winter and summer respectively. The formulations for winter and summer use are slightly different, which can usually be achieved by adjusting the amount of curing accelerator. When the ambient temperature is lowered, the amount of curing accelerator can be increased appropriately. A person skilled in the art can know how to adjust the amount of the curing accelerator at a certain service temperature according to common knowledge in the field or through simple experiments.

Repair glue

The repair glue is composed of two components, A and B, and the ratio of the two components is 2:1.

Component A includes:

(A): 30%～50% (weight) liquid bisphenol A type epoxy resin,

(B): 10%～20% (weight) of liquid novolac epoxy resin

(C): 5% to 10% by weight of fumed silica, and

(D: 35% to 40% (weight) of wollastonite or alumina filler;

Part B includes:

(E): 60%～80% (weight) of modified amine epoxy curing agent, and

(F): 20%～40% (weight) accelerator 2,4,6-tris(dimethylamino)-methylphenol;

The curing agent of (E) in the B component can be, for example, a modified aliphatic amine, such as diethylene triamine glycerol n-butyl ether (such as commercial product 593) or phenolic modified polyamine (such as commercial product T31).

Table 1 shows the properties of components A and B that constitute the defect filling and repairing adhesive after mixing and curing.

Table 2 Specifications and properties of repair glue project Repair glue LX200W (winter use) LX200S (summer use) Group A and B distribution ratio 2:1 2:1 Applicable temperature ℃ 5～15 15～35 Available time (min) 30～160 50～210 Drying time to touch (hr) 3.5～10.0 3.0～10.0 shape putty Performance Steel-steel bond shear strength (Mpa) Steel-steel bond tensile strength (Mpa) Colloid compressive strength (Mpa) ≥10 / ≥50 The main purpose Repair pipe surface defects

The repair glue can be prepared according to the following method: mix and store the A and B components of the supporting resin separately, weigh them accurately according to the specified proportion before use, put them into the container, and mix them evenly with a stirrer. It is advisable to use up the amount of glue at one time and use it up within the usable time.

sticky dipping

The sticky dipping glue is composed of two components, A and B, and the ratio of the two components is (3-4):1.

Component A includes:

(A'): 68%～84% (weight) of liquid epoxy resin,

(B'): 10% to 15% (weight) of acrylate liquid rubber,

(C'): 5% to 15% by weight of fumed silica, and

(D'): 1% to 2% (weight) of pigments;

Part B includes:

(E'): 70%～90% (weight) of modified amine epoxy curing agent, and

(F'): 10%～30% (weight) of epoxy curing accelerator 2,4,6-tris(dimethylamino)-methylphenol;

The epoxy resin of described A component (A') can be bisphenol A type epoxy resin or vinyl modified epoxy resin; The curing agent of B component (E') can be modified aliphatic amine, for example Diethylene triamine glycerin n-butyl ether (such as commercial product 593) or phenolic modified polyamine (such as commercial product T31).

Table 2 shows the properties of the mixed and cured components A and B that constitute the dipping glue.

Table 3 Specifications and properties of sticky dipping glue project sticky dipping LZ300W (winter use) LZ300S(Summer use) The ratio of A and B components (3~4): 1 (3~4): 1 Applicable temperature ℃ 5～15 15～35 Available time (min) 40～170 60～180 Drying time to touch (hr) 4.0～12.0 3.0～10.0 shape creamy Performance Tensile strength (Mpa) Bending strength (Mpa) Compressive strength (Mpa) Steel shear strength (Mpa) Elastic modulus (Mpa) ≥30 ≥40 ≥50 ≥10 ≥2×10 ³ The main purpose Brush the surface of the steel pipe, penetrate and paste the carbon fiber sheet

The sticky dipping glue can be prepared according to the following method: Mix and store the A and B components of the supporting resin separately, weigh them accurately according to the specified proportion before use, put them into the container, and mix them evenly with a stirrer. It is advisable to use up the amount of glue at one time and use it up within the usable time.

Specifically, the resin-based carbon fiber composite material used for repairing and reinforcing defective pipelines of the present invention includes the following materials:

1. The repair adhesive layer used to fill and repair the surface defects of the pipeline;

2. Multi-layer carbon fiber sheet, wherein the carbon fiber sheet is coated with sticky dipping glue, and each carbon fiber sheet layer is laid alternately at a certain angle as required.

The present invention also provides a reinforcing material for repairing and reinforcing defective pipelines, which includes multiple layers of the resin-based carbon fiber composite material, wherein each layer of resin-based carbon fiber composite material is placed along the radial or circumferential direction of the pipeline, Adjacent two layers of composite materials can be laid parallel, vertical or staggered at a certain angle.

The reinforcing material also includes a multi-layer external anti-corrosion material outside the resin-based carbon fiber composite material. In principle, the external anti-corrosion material is the same as the original external anti-corrosion material that needs to be reinforced. The commonly used external anti-corrosion material is polyethylene cold-wound adhesive tape, and the thickness of the polyethylene adhesive tape is preferably 0.7mm-2.0mm; the tensile strength is preferably greater than 18Mpa.

In actual application, according to the specific situation of pipeline defects, the professional technicians can determine the thickness, width and amount of reinforcing material of the reinforcing layer according to the usual design method of defect reinforcing parameters.

Another object of the present invention is to provide a method for repairing and reinforcing defective pipelines, especially defective metal pipelines, with the material of the present invention, which has good construction safety and superior performance.

Another object of the present invention is to provide a repairing and reinforcing material and method for external damage and defects of oil and gas pipelines, that is, a technology for repairing and strengthening external damage and defects of oil and gas pipelines by using the above-mentioned materials and methods.

Using the material of the present invention to pipelines, for example, the method for repairing and reinforcing the external damage defects of oil and gas metal pipelines comprises the following steps:

1. Clean the surface of the pipeline;

2. Repair the defects on the surface of the pipeline

Fill the recessed parts of the pipeline surface, such as honeycomb, pockmarked surface, small hole, near the weld, etc., with repair glue, and repair until the surface is smooth;

3. Wet paste carbon fiber cloth

Paste carbon fiber cloth according to a certain size and number of layers, and place each resin-based carbon fiber composite material layer along the radial or circumferential direction of the pipe as required, so that the adjacent two layers of composite materials are parallel, perpendicular or at a certain angle Staggered laying. Wherein said carbon fiber cloth is brushed or impregnated with sticky dipping glue of the present invention;

4. Carry out anti-corrosion repair on the work area

The surface of the pasted carbon fiber composite material is wound and protected with polyethylene cold-winding adhesive tape.

Before implementing this method, the surface of the pipeline must first be cleaned, and the defects on the surface of the pipeline, such as honeycombs, pockmarks, small holes, near the weld, etc., are repaired with repair glue, that is, the repair putty is applied to the surface until the surface is smooth and the surface is smooth. If there are still uneven and rough lines, it should be smoothed with sandpaper.

The pasting of carbon fiber cloth adopts the method of wet pasting, that is, the carbon fiber cloth is first brushed or impregnated with the epoxy resin sticky dipping glue of the present invention, and then used for winding reinforcement. In order to ensure the construction quality, the vertical and horizontal laps of carbon fiber sheets should be kept at a certain length.

The anti-corrosion repair of the work area should be carried out after the adhesive on each pasted surface in the reinforcement work area is dry. The overlapping width of the winding layer and the original anti-corrosion layer should be kept at a certain length. When winding, the side seams of the adhesive tape should be parallel and must not be twisted or wrinkled.

In order to ensure the construction quality, when excavation and backfilling are required, it should be carried out in accordance with the specified construction requirements. For example, for the defect positions determined by on-site inspection, manual excavation must be carried out under the supervision of on-site supervisors. Pay attention to measure the buried depth during excavation to prevent ironware from damaging the anti-corrosion coating and steel pipes. After the reinforcement construction is completed and it is confirmed that there are no leaks in the excavated pipe section, fine sand or plain soil shall be used for layered compaction and backfilling, and the site shall be cleaned and the original topography restored to ensure that the buried depth of the pipeline meets the design requirements.

In the following, the materials and methods of the present invention will be described in detail through the description of specific embodiments of the present invention in conjunction with the accompanying drawings.

Description of drawings

Figure 1 is a schematic diagram of the pipeline and defects used in the blasting test, wherein the first defect is the part to be repaired and reinforced, and the second defect is the part used for comparison without repair and reinforcement.

Fig. 2 The pressure-time relationship diagram of the hydraulic burst test.

Figure 3 is a photograph of the appearance of the reinforced part in the blasting test. It can be seen from the photos that the pipes on both sides of the reinforced part bulge under pressure, but the reinforced part remains unchanged.

Fig. 4 is a photo of the mechanical scratch defect morphology of the pipeline in Example 2.

Fig. 5 is a photo of the defect morphology of the pipeline in Example 2 caused by external force.

Figure 6 is a photo of the appearance of the pipeline after repair and reinforcement in Example 2.

Detailed ways

In order to further illustrate the materials and construction techniques involved in this technology, the following examples are given. However, these examples do not limit the scope of the present invention in any way.

Embodiment 1: The technical solution of the present invention is evaluated by the hydraulic blasting test method

In order to test the implementation effect of this technology, taking φ660 gas transmission steel pipe as an example, the size of the defect that may exist in the gas transmission pipeline is simulated, and the technology is evaluated by hydraulic blasting test method. See Figure 1 for the test tube and its defects. The test process is as follows:

Cut a 5.45m pipe of the same size and material as the main line of a gas pipeline (the pipe is an X60 spiral welded pipe with a diameter of 660mm, a wall thickness of 8.7mm, and a design working pressure of 6.4Mpa), and leave The heads of the exhaust holes and water inlet holes are blocked (see Figure 2).

Clean the parts of the pipe body that need to be reinforced to remove the anti-corrosion layer, epoxy coating and dirt on the outer surface of the pipe, and make the surface treatment quality reach the St3 level specified in GB/T8923-1988.

Make a defect (defect 1) of 50mm×30mm×4mm at the position where the anticorrosion layer is peeled off, and use the technology of the present invention (see embodiment 2) to repair and reinforce the defect. In order to facilitate test comparison, a defect (defect 2) of 50mm×30mm×2.0mm was made in another part of the test tube, and this defect was not reinforced.

Inject water into the test tube and exhaust it. After checking that the sample is filled with water and there is no air leakage, pressurize step by step until the sample is destroyed. See Figure 2 for the pressurization process. The results of the blasting test show that: the damage occurred at the small defect (defect 2) that has not been repaired and reinforced, and the damage is a typical tear-type damage; the test tube has obvious swelling phenomenon, while the repaired and reinforced defect There is no obvious change in the test tube on both sides of the reinforced part under pressure, resulting in obvious expansion (see Figure 3); the burst pressure of the reinforced tube body is 16.4Mpa, which is much higher than the design work of the sample Pressure (6.4Mpa), indicating that the technology has achieved the purpose of reinforcement.

Example 2: Repair and reinforcement of natural gas pipeline defects

The field embodiment of the technology of the present invention is an example of defect reinforcement applied to the Shaanxi-Beijing gas pipeline. The defect at this place is reinforced by using the reinforcing material and repairing and reinforcing method described in the present invention. The specific implementation process is as follows:

1. Excavation and surface cleaning of pipelines

The defect point of reinforcement construction is located somewhere in a certain section of Shaanxi-Beijing pipeline. The site is located on the edge of the desert, with a sandy soil structure, the surface water layer is relatively shallow, the buried depth of the pipeline is about 1300mm, and the external surface temperature of the pipeline is about 40°C. The tube body has three mechanical damages. One is an obvious mechanical scratch, 150mm long, 3.5mm deep, and the deepest width is 20mm (see Figure 4); the other two are bruises, 1.5mm deep, 20mm long (see Figure 5).

The surface cleaning of the pipeline, for example, the result of surface treatment should make the quality of the basic pretreatment reach the St3 level stipulated in the national standard GB/T8923-1988.

2. Repair the pipeline

For steel pipe surface defects such as honeycomb, pockmarks, small holes, welds, etc., use repair glue, that is, repair putty, scrape and fill, and repair until the surface is smooth. If there are still uneven and rough surfaces on the surface, it should be smoothed with sandpaper. The formula and dosage of the repair glue are shown in Table 4.

3. Paste carbon fiber cloth by wet method

First prepare sticky dipping glue and repairing glue according to the preparation method described above and the formula described in Table 3, then the carbon fiber cloth is coated with the epoxy resin sticking dipping glue (see Table 3 for the amount of sticky dipping glue), and use its Carry out winding reinforcement.

Table 3 Reinforcing materials and dosage material name Composition and specification Proportion Dosage Repair glue A component 45% bisphenol A type epoxy resin (CYD128, Yueyang Petrochemical General Plant Epoxy Resin Factory), 10% novolak type epoxy resin (F51), 10% fumed silica, and 35% alumina filler A and B components are mixed 2:1 150g B component 70% modified amine epoxy curing agent (593), and 30% accelerator 2,4,6-tris(dimethylamino)-methylphenol sticky dipping A component 80% bisphenol A type epoxy resin (CYD128), 10% acrylate liquid rubber, 8% fumed silica, 2% pigment A and B components are mixed 3:1 4800g B component 75% modified amine epoxy curing agent (593), and 25% accelerator 2,4,6-tris(dimethylamino)-methylphenol carbon fiber Unidirectional carbon fiber cloth with a weight per unit area of 300g/ ^m2 and a width of 330mm or 500mm A width of 330mm requires 12.9mm, and a width of 500mm requires 3.0m Polyethylene adhesive tape Thickness 1.4mm, width 200mm (produced by Chuo Plastic Co., Ltd.) 14.3m

The number and direction of the winding layers of the carbon fiber cloth are two layers in the hoop direction, one layer in the axial direction, two layers in the hoop direction, one layer in the axial direction and two layers in the hoop direction, totaling eight layers.

4. Carry out anti-corrosion repair on the work area

Anti-corrosion repair should be carried out after the adhesive on each paste surface in the reinforcement operation area is dry. The outer anti-corrosion material used is polyethylene adhesive tape, which is wrapped with one layer. The overlapping width of the winding layer and the original anti-corrosion layer should not be less than 100mm. The overlapping length between the beginning and end of the adhesive tape should not be less than 1/4 of the pipe circumference, and not less than 100mm. When winding, the side seams of the adhesive tape should be parallel and must not be twisted or wrinkled.

The appearance of the pipeline after repair and reinforcement is shown in Figure 6.

Due to the existence of this defect, the pipe section described in this embodiment has been operating under the design working pressure, which virtually increases the operating cost of the pipeline; after this repair and reinforcement, the operating working pressure can be increased to the design level.

In a word, the present invention is a brand-new supporting technology suitable for pipeline repair and reinforcement, and is suitable for reinforcement of damaged pipelines with different diameters caused by corrosion, mechanical or other reasons. The construction process does not require pipeline shutdown operations, and the reinforcing material can be tightly wound around the pipeline, which has little effect on the increase in the pipeline's own weight. It can be integrated with the pipeline to jointly bear the pressure inside the pipeline, and make the pressure bearing capacity of the repaired pipeline reach or exceed that of the original pipeline.

The embodiments of the present invention have been described in detail above, and it is obvious to those skilled in the art that many modifications and changes can be made without departing from the basic spirit of the present invention. All these changes and improvements are within the protection scope of the present invention.

Claims (10)

1. Resin-based carbon fiber composite materials used for the repair and reinforcement of pipelines with defects, including the repair adhesive layer used to fill and repair the external defects of the pipeline, and multi-layer carbon fiber sheets painted or impregnated with adhesive dipping glue. The repair glue is composed of two components, A and B, in which: The first component of the repair glue includes: (A): 30%～50% (weight) liquid bisphenol A type epoxy resin, (B): 10%～20% (weight) of liquid novolac epoxy resin (C): 5% to 10% by weight of fumed silica, and (D): 35% to 40% (weight) of wollastonite or alumina filler; The B component of described repair adhesive comprises: (E): 60%～80% (weight) of modified amine epoxy curing agent, and (F): 20%～40% (weight) accelerator 2,4,6-tris(dimethylamino)-methylphenol; Wherein the curing agent in (E) in component B is a modified aliphatic amine; The first and second components of the repair glue are uniformly mixed with a stirrer in a ratio of 2:1 before use; Described viscous dipping glue is made up of two components of A and B, wherein The first component of the sticky dipping glue includes: (A'): 68%～84% (weight) of liquid epoxy resin, (B'): 10% to 15% (weight) of acrylate liquid rubber, (C'): 5% to 15% by weight of fumed silica, and (D'): 1% to 2% (weight) of pigments; The second component of the sticky dipping glue includes: (E'): 70%～90% (weight) of modified amine epoxy curing agent, and (F'): 10%～30% (weight) of epoxy curing accelerator 2,4,6-tris(dimethylamino)-methylphenol; Wherein the epoxy resin in the first component (A') is bisphenol A type epoxy resin or vinyl modified epoxy resin; The curing agent in the second component (E') is a modified aliphatic amine; The two components A and B of the sticky dipping glue are uniformly mixed with a stirrer in a ratio of (3-4):1 before use. 2. The resin-based carbon fiber composite material according to claim 1, wherein the elastic modulus of the carbon fiber sheet is in the range of (1.0-3.0)×10 ⁵ Mpa, and the elongation δ is in the range of 0.2-3.0%. 3. The resin-based carbon fiber composite material according to claim 1 or 2, wherein said modified aliphatic amine is diethylene triamine glycerin n-butyl ether or phenolic modified polyamine. 4. The resin-based carbon fiber composite material according to claim 1, wherein said multi-layer carbon fiber sheets are staggered at a certain angle. 5. A reinforcing material for repairing and reinforcing defective pipelines, the material comprising the resin-based carbon fiber composite material according to any one of claims 1-4, wherein the multi-layer resin-based carbon fiber composite material is along the radial direction of the pipeline Or placed in a ring direction, two adjacent layers of composite materials are laid in parallel, vertically or staggered at a certain angle. 6. The reinforcing material according to claim 5, wherein the reinforcing material further comprises one or more layers of external anti-corrosion materials outside the resin-based carbon fiber composite material. 7. The reinforcing material according to claim 6, wherein said outer anti-corrosion material is polyethylene adhesive tape. 8. A method for repairing and reinforcing a defective pipeline with the material according to any one of claims 1-7, the method comprising the following steps: (1) repair the defect on the pipeline surface with the repair glue described in claim 1, and repair it to smooth surface; (2) Wet paste carbon fiber sheet Paste the carbon fiber sheet according to a certain size and number of layers, the carbon fiber sheet is coated with the sticky dipping glue described in claim 1, or impregnated with the sticky dipping glue, and each resin-based carbon fiber composite material layer is made as required It is placed along the radial or circumferential direction of the pipeline, so that two adjacent layers of composite materials are laid in parallel, vertical or staggered at a certain angle. 9. according to the described method of claim 8, this method also comprises the step of carrying out anticorrosion treatment to work area, and this step comprises after sticking described carbon fiber sheet material outer surface presses certain size and number of layers to use polyethylene cooling Wrap adhesive tape around it to protect it from tangles. 10. A method according to claim 8 or 9, further comprising requiring surface cleaning of the damaged area prior to repairing the pipeline.

Images