Method for repairing and reinforcing pipeline by means of composite materials

Abstract

The invention relates to a method for repairing and reinforcing a pipeline by means of composite materials. The method for repairing and reinforcing the pipeline by means of the composite materials comprises the following steps that S1, defect positioning and working surface creating are conducted on the pipeline to be repaired and reinforced; S2, the surface of the pipeline is treated; S3, defects on the surface of the steel pipeline are filled and leveled up; S4, an anti-stripping coating is painted; S5, adhesion of carbon fiber sheets is conducted; S6, curing and maintenance are conducted, wherein vacuum auxiliary curing is adopted; S7, the hardness of the composite materials is tested and checked, wherein a hardness tester is used for measuring whether a reinforcing layer is qualified or not during checking; S8, a repaired mouth and the reinforcing layer are protected, and the reinforced portion of the steel pipeline is painted with protective paint or is wrapped in a protective layer; S9, an outer protective layer of the steel pipeline is checked and accepted. The method for repairing and reinforcing the pipeline by means of the composite materials has the advantages that the technical processes are simple, operation is convenient, cost is low, and the construction cycle is short; meanwhile, the strength, the crack resistance, the seepage resistance and the corrosion resistance of the wall of the repaired and reinforced pipeline are improved, and the service life of the repaired and reinforced pipeline is prolonged.

Description

technical field [0001] The invention relates to a method for reinforcing and repairing pipelines with composite materials. Background technique [0002] Pipeline is a communication device, which is used in the transportation of gas, liquid or fluid with solid particles, and can be seen everywhere in industrial and agricultural production and social life. Pipelines are needed in water supply, drainage, heat supply, gas supply, long-distance transportation of oil and gas, agricultural irrigation, hydraulic engineering and various industrial installations. Steel pipes are widely used in industrial production and transportation of oil and gas. During long-term use, such metal pipes will gradually undergo chemical and electrochemical corrosion, corrosion, cracks and other pipe defects under the influence of the external environment and the transport medium. ; Or damaged by external force will appear tube defects. These damages will lead to a decrease in the safety of pipeline o...

AI Technical Summary

Problems solved by technology

These damages will lead to a decrease in the safety of pipeline operation, and eventually leakage, explosion and other accidents may occur, seriously threatening the safety of personnel and property

[0003] The traditional means of pipeline damage repair are methods such as welding to repair scars, sleeves or cutting off old pipes and welding new pipe sections. These methods have defects: 1. Welding will reduce the strength of the pipeline. Problems such as hydrogen embrittlement and residual stress are easy to occur during the process; 2. The cost of welding is high, the transportation needs to be stopped and the pipeline should be emptied and cleaned before welding, welding requires high technical level of operators, and necessary on-site flaw detection is required after welding, especially for natural gas Draining oil pipelines is extremely expensive

The disadvantages of glass fiber composite materials for pipeline reinforcement are: 1. Glass fiber composite materials have poor moisture and heat aging resistance, and are not suitable for use in environments with high humidity and high temperature; 2. Glass fiber modulus and strength are higher than steel pipes Low, not suitable for pipelines with high pressure and frequent pressure fluctuations; 3. Prefabricated composite materials have high rigidity and are not suitable for reinforcement of complex structures. It is not easy to ensure the tight fit between the material and the pipe body during construction

The disadvantages of the wet winding method are: 1. The strength of the finished composite material is not easy to grasp, and the glue solution needs to be prepared on site during construction. The ratio of different components in the glue solution, the ratio of resin to fiber, and the infiltration of resin to fiber are all affected by the instrument. 1. The responsibility, proficiency of the construction workers and the influence of the ambient temperature at that time; 2. The reinforcement construction of large-scale pipes, high-temperature pipes and complex-shaped pipes is difficult. During wet construction, the composite material is easy to fall under the influence of gravity, and the viscosity is not enough to fall off easily. , can not fit tightly in the reinforcement part

The disadvantages of reinforcement of preformed materials are: 1. The storage and transportation costs are high, the shelf life of prepregs is short, and storage and transportation require a low temperature environment; 2. The bonding between the reinforcement layers is not tight enough, which affects the strength of the reinforcement layer; 3. .The prepreg curing process is costly, time-consuming and labor-intensive. Prepreg curing requires special heating equipment. Custom-made eddy current heaters are often used for heating. The construction is cumbersome. The heating equipment placed during heating will affect the smoothness of the reinforcing layer and reduce the reinforcement strong layer strength

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