CN113025156A - Reinforcing material for gas overhead pipeline and construction method - Google Patents

Abstract

The invention belongs to the technical field of pipeline laying, in particular to a reinforcing material of a gas overhead pipeline and a construction method, and the following scheme is proposed, wherein the reinforcing material comprises a repairing material and an impregnating material, the repairing material comprises a component A and a component B, and the component A comprises 30-50 parts of bisphenol A type liquid epoxy resin; 3-10 parts of a diluent; 5-10 parts of a nano modifier and 40-60 parts of quartz powder, wherein the component B comprises a composite modified amine curing agent, the impregnating material comprises a component C and a component D, and the component C comprises 80-90 parts of bisphenol A type liquid epoxy resin; 3-10 parts of a diluent; 1-3 parts of coupling agent and 1-7 parts of other auxiliary agents, wherein the component D comprises a composite modified amine curing agent. The invention aims to develop a glass fiber reinforced composite material system and a construction method thereof, which have the advantages of high pressure-bearing strength, no fire in the construction process, no galvanic corrosion and other problems.

Description

Reinforcing material for gas overhead pipeline and construction method

Technical Field

The invention relates to the technical field of pipeline laying, in particular to a reinforcing material for a gas overhead pipeline and a construction method.

Background

With the rapid development of pipeline industry, the pipeline laying mileage is continuously increased, the pipeline facilities are continuously perfected, the pipeline application range is also continuously expanded, and once pipeline lines and pipelines are corroded and broken down, normal production and life are seriously influenced. Therefore, the maintenance of the pipeline becomes an important item in daily work, wherein the pipeline maintenance and reinforcement technology plays a leading role.

The pipeline reinforcing method mainly comprises welding reinforcing, clamp reinforcing, composite material reinforcing and the like. The welding type reinforcing method has the advantages of complex process, high cost and higher construction risk on the operating oil and gas pipeline; the clamp type reinforcing method is mainly used for temporary first-aid repair and is mainly used for pipelines with leakage; the reinforcing method adopting the composite materials has simple process and low cost, avoids firing, and becomes a reinforcing method accepted by various pipeline companies at home and abroad. The reinforcing method of composite materials mostly focuses on carbon fiber and glass fiber composite materials. Although the carbon fiber has high strength, the carbon fiber has strong conductivity, and can cause galvanic corrosion of pipelines to cause cathode stripping, so a layer of cathode stripping resistant coating is generally used in a matching way, the process complexity is increased, the price is high, and the toughness and the impact resistance of the carbon fiber are insufficient. The glass fiber composite material has low cost, can effectively avoid galvanic corrosion, makes up for the defect of insufficient toughness of the carbon fiber, but can only be used for reinforcing pipelines with low strength requirements.

Disclosure of Invention

Based on the technical problems in the background art, the invention provides a reinforcing material for a gas overhead pipeline and a construction method.

The invention provides a reinforcing material for a gas overhead pipeline, which comprises a repairing material and an impregnating material, wherein the repairing material comprises a component A and a component B, and the component A comprises 30-50 parts of bisphenol A type liquid epoxy resin; 3-10 parts of a diluent; 5-10 parts of a nano modifier and 40-60 parts of quartz powder, wherein the component B comprises a composite modified amine curing agent, the impregnating material comprises a component C and a component D, and the component C comprises 80-90 parts of bisphenol A type liquid epoxy resin; 3-10 parts of a diluent; 1-3 parts of coupling agent and 1-7 parts of other auxiliary agents, wherein the component D comprises a composite modified amine curing agent.

The utility model provides a reinforcement material's of gas overhead pipeline construction method, including metal pipeline and construction step, construction step is including surface treatment, pipeline defect repair material, pipeline reinforcement impregnated material, winding glass fiber cloth and finished product combined material's protection, the top outer wall of metal pipeline is provided with the defect position, and the inner wall of defect position fills there is the mending material, mending material and other positions of metal pipeline are made level, the outer winding glass fiber cloth of metal pipeline, and the outside of glass fiber cloth is scribbled and is smeared the flooding glue

Preferably, the surface treatment comprises the following operative steps:

1) removing the original anticorrosive coating of the metal pipeline, wherein the length of the anticorrosive coating at least exceeds 50mm of each of two sides of the defect to be repaired, no obvious old coating residue exists on the surface after removal, and damage to the metal of the pipe body is avoided in the removing process; the removed old anticorrosive coating cannot be discarded on site and needs to be treated uniformly;

2) the reinforcing construction is generally carried out within 4 hours after the surface base layer of the pipe is treated, so as to avoid the reoxidation of the surface; if the specified time is exceeded, surface rust removal needs to be carried out again; the pretreatment quality of the base layer reaches St3 grade specified in GB/T8923-1988: the steel surface should not have visible grease and dirt, and have no attachments such as scale, rust, paint coating and the like which are not firmly attached; the rust removal grade is more thorough than that of St2, and the surface of the exposed part of the substrate has obvious metal luster;

3) paying off and positioning the part needing to be reinforced before construction, and marking;

4) after the surface treatment is carried out on the defect points, the defect points are firstly confirmed, the depth and the axial length of the defect points are tested by utilizing a ruler and an ultrasonic thickness gauge, and the defect points are recorded, photographed and filed. The internal corrosion defect is indirectly measured by an ultrasonic thickness gauge, and the thickness can be measured by drawing grid lines on the surface of the pipeline one by one; when the axial length of the defect is measured, if the distance between two corrosion defects is less than 25mm, the two corrosion defects are regarded as the same corrosion defect; when the defect corrosion width is measured, if the distance between two corrosion defects is less than 6 times of the wall thickness, the two corrosion defects are also regarded as the same corrosion defect;

after the original anticorrosive coating and oxides on the surface of the steel pipe are removed and before the composite material is installed, the surface of the steel pipe is cleaned by using an antioxidant special cleaning agent and is fully dried.

7. Preferably, the pipeline defect repairing material comprises the following operation steps:

s1: according to the pipe surface temperature and the proportion specification of a product specification (repair material A: B is 10: 1), mixing a high-strength repair material group, fully stirring, uniformly mixing, and visually observing without color difference;

s2: filling the mixed high-strength repair material into all external defects (honeycombs, pitted surfaces, small holes and the like) on the surface of the pipeline and two sides of a spiral welding line or a circumferential welding line until the filler is completely filled, leveling and repairing, wherein the positions of corrosion defects are repaired by adopting a special repair agent to form hard substances similar to steel and iron, and the hard substances have a good bonding effect with the surface of the steel;

s3: after the defect repairing material is completely filled, curing time is generally 8-12 hours at normal temperature, and the repaired part needs to be ensured to be clean and dry during curing; when the temperature is lower in winter, the curing speed can be accelerated by using heating measures, and the heating temperature should not exceed 80 ℃.

8. The method for constructing a reinforcing material for a gas overhead pipe according to claim 4, wherein the winding of the glass fiber cloth comprises the steps of:

s4: the defect part of the tube body is arranged in the middle of the fiber cloth, and the distance between the edge of the defect and the edge of the fiber cloth is not less than 50m when the tube body is installed for the defect with longer longitudinal direction;

s5: the initial position of the fiber cloth is positioned at the position of 2 points (clockwise winding) or 10 points (anticlockwise winding) of the pipeline, the high-strength viscose is coated on the annular direction of the pipeline before the first layer is wound, after the first layer is wound for a circle, the fiber cloth is fully soaked by resin until no dry point exists, then the second layer is wound, the uniformly mixed viscose is uniformly coated on the fiber cloth by using a brush, then the glass fiber cloth is wound, and the process is repeated;

s6: the fiber cloth is wound on the outer surface of the pipeline at the repaired part with proper force, and in-situ winding is adopted until the number of layers required by construction design is reached;

s7: and each layer of wet-process repair composite material is wound, and a special tool is required to drive and press the wet-process repair composite material.

9. Preferably, the protection of the finished composite material comprises the following steps:

s8: in the weather with sand and dust, sand prevention measures must be taken during the construction process and on the composite material which is constructed but not solidified until the composite material suite is solidified;

s9: in rainy days, waterproof measures must be taken during the construction process and on the composite material which is constructed but not cured until the composite material suite is cured;

s10: when the construction is carried out at the temperature of less than 10 ℃ on the surface of the pipe or the environment, heating measures are adopted to promote the curing of the composite material, and the heating temperature is not more than 60 ℃;

s11: in the process of curing the composite material, if the repair part is easily influenced by the underground water of the pipe ditch, water pumping and drainage measures and the conditions of soil wall stability and support firmness are checked according to relevant regulations in Q/SY1247-2009 safety management Specification for excavation work until the composite material is cured.

The beneficial effects of the invention are as follows:

1. the reinforcing material for gas overhead pipeline and its construction method features its excellent compression strength and metal adhesion strength, elastic modulus over 3GPa and performance over 20% higher than that of common pipeline. The repair back is outstanding with the metal pipeline wholeness, with the effective transmission of pressure, with the cooperation of the fine reinforcing system of glass, can effectively prevent that the weak department of metal pipeline from warping.

2. The reinforcing material and the construction method of the gas overhead pipeline have the advantages that the impregnating compound is arranged, the material is good in wettability with glass fibers, strong in bonding force with metal, excellent in mechanical property and glass fiber matching property, and obvious in reinforcing effect and high in safety, the elastic modulus and the tensile strength of the fiber composite material formed by the material and the matched glass fibers exceed the product performance requirement by more than 10%.

3. The reinforcing material of the gas overhead pipeline and the construction method thereof are characterized in that the composite material is arranged, a Q235 steel pipe is selected and provided with a notch after a hydraulic explosion experiment test is carried out on a composite material system, the pipe body is pressurized after the composite material system is reinforced by using the material system and the construction method, and when the pressure is continuously increased to 28.23MPa, the pipe body is broken at a non-reinforcing position without changing the reinforcing position.

4. The reinforcing material of the gas overhead pipeline and the construction method thereof do not need other coatings except the composite material, thereby greatly reducing the cost, facilitating the construction and having simple operation.

The parts of the device not involved are the same as or can be implemented using prior art.

Drawings

Fig. 1 is a schematic structural view of a reinforcing material for a gas overhead pipeline and a construction method thereof according to the present invention.

In the figure: 1 metal pipeline, 2 defect parts, 3 repair materials, 4 glass fiber cloth and 5 impregnating adhesive.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

A reinforcement material for a gas overhead pipeline comprises a repairing material and an impregnating material, wherein the repairing material comprises a component A and a component B, and the component A comprises 30-50 parts of bisphenol A type liquid epoxy resin; 3-10 parts of a diluent; 5-10 parts of nano modifier, 40-60 parts of quartz powder, and the component B comprises a composite modified amine curing agent; the measured performance indexes of the material are as follows: tensile strength is 30 MPa; the compressive strength is 110 MPa; the bonding strength with metal is 10 MPa; ③ 99 percent of solid content.

The impregnating material comprises a component C and a component D, wherein the component C comprises 80-90 parts of bisphenol A type liquid epoxy resin; 3-10 parts of a diluent; 1-3 parts of coupling agent, 1-7 parts of other auxiliary agents, and the component D comprises a composite modified amine curing agent, wherein the measured performance indexes of the material are as follows: tensile strength is 55 MPa; elongation at break 3%; bonding strength between the metal and the metal is 10 MPa; fourthly, the solid content is 99 percent; viscosity 1000 cps.

Referring to fig. 1: the utility model provides a construction method of reinforcement material of gas overhead pipeline, including metal pipeline (1) and construction step, construction step is including surface treatment, pipeline defect repair material, pipeline reinforcement impregnating material, winding glass fiber cloth and finished product combined material's protection, the top outer wall of metal pipeline (1) sets up defective part (2), and the inner wall of defective part (2) is filled with repair material (3), repair material (3) are leveled with other positions of metal pipeline (1), the outer winding glass fiber cloth (4) of metal pipeline (1), and impregnating compound (5) have been paintd in the outside of glass fiber cloth (4).

In the invention, the surface treatment comprises the following operation steps:

1) removing the original anticorrosive coating of the metal pipeline (1), wherein the length of the anticorrosive coating at least exceeds 50mm of each of two sides of the defect to be repaired, no obvious old coating residue exists on the surface after removal, and damage to the metal of the pipeline body is avoided in the removing process; the removed old anticorrosive coating cannot be discarded on site and needs to be treated uniformly;

2) the reinforcing construction is generally carried out within 4 hours after the surface base layer of the pipe is treated, so as to avoid the reoxidation of the surface; if the specified time is exceeded, surface rust removal needs to be carried out again; the pretreatment quality of the base layer reaches St3 grade specified in GB/T8923-1988: the steel surface should not have visible grease and dirt, and have no attachments such as scale, rust, paint coating and the like which are not firmly attached; the rust removal grade is more thorough than that of St2, and the surface of the exposed part of the substrate has obvious metal luster;

3) paying off and positioning the part needing to be reinforced before construction, and marking;

4) after the surface treatment is carried out on the defect points, the defect points are firstly confirmed, the depth and the axial length of the defect points are tested by utilizing a ruler and an ultrasonic thickness gauge, and the defect points are recorded, photographed and filed. The internal corrosion defect is indirectly measured by an ultrasonic thickness gauge, and the thickness can be measured by drawing grid lines on the surface of the pipeline one by one; when the axial length of the defect is measured, if the distance between two corrosion defects is less than 25mm, the two corrosion defects are regarded as the same corrosion defect; when the defect corrosion width is measured, if the distance between two corrosion defects is less than 6 times of the wall thickness, the two corrosion defects are also regarded as the same corrosion defect;

after the original anticorrosive coating and oxides on the surface of the steel pipe are removed and before the composite material is installed, the surface of the steel pipe is cleaned by using an antioxidant special cleaning agent and is fully dried.

10. The pipeline defect repairing material comprises the following operation steps:

s1: according to the pipe surface temperature and the proportion specification of a product specification (repair material A: B is 10: 1), mixing a high-strength repair material group, fully stirring, uniformly mixing, and visually observing without color difference;

s2: filling the mixed high-strength repair material into all external defects (honeycombs, pitted surfaces, small holes and the like) on the surface of the pipeline and two sides of a spiral welding line or a circumferential welding line until the filler is completely filled, leveling and repairing, wherein the positions of corrosion defects are repaired by adopting a special repair agent to form hard substances similar to steel and iron, and the hard substances have a good bonding effect with the surface of the steel;

s3: after the defect repairing material is completely filled, curing time is generally 8-12 hours at normal temperature, and the repaired part needs to be ensured to be clean and dry during curing; when the temperature is lower in winter, the curing speed can be accelerated by using heating measures, and the heating temperature should not exceed 80 ℃.

11. In the invention, the glass fiber cloth winding method comprises the following steps:

s4: the defect part of the tube body is arranged in the middle of the fiber cloth, and the distance between the edge of the defect and the edge of the fiber cloth is not less than 50m when the tube body is installed for the defect with longer longitudinal direction;

s5: the initial position of the fiber cloth is positioned at the position of 2 points (clockwise winding) or 10 points (anticlockwise winding) of the pipeline, the high-strength viscose is coated on the annular direction of the pipeline before the first layer is wound, after the first layer is wound for a circle, the fiber cloth is fully soaked by resin until no dry point exists, then the second layer is wound, the uniformly mixed viscose is uniformly coated on the fiber cloth by using a brush, then the glass fiber cloth is wound, and the process is repeated;

s6: the fiber cloth is wound on the outer surface of the pipeline at the repaired part with proper force, and in-situ winding is adopted until the number of layers required by construction design is reached;

s7: and each layer of wet-process repair composite material is wound, and a special tool is required to drive and press the wet-process repair composite material.

12. In the present invention, the protection of the finished composite material comprises the following steps:

s8: in the weather with sand and dust, sand prevention measures must be taken during the construction process and on the composite material which is constructed but not solidified until the composite material suite is solidified;

s9: in rainy days, waterproof measures must be taken during the construction process and on the composite material which is constructed but not cured until the composite material suite is cured;

s10: when the construction is carried out at the temperature of less than 10 ℃ on the surface of the pipe or the environment, heating measures are adopted to promote the curing of the composite material, and the heating temperature is not more than 60 ℃;

s11: in the process of curing the composite material, if the repair part is easily influenced by the underground water of the pipe ditch, water pumping and drainage measures and the conditions of soil wall stability and support firmness are checked according to relevant regulations in Q/SY1247-2009 safety management Specification for excavation work until the composite material is cured.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (6)

1. The reinforcing material for the gas overhead pipeline comprises a repairing material and an impregnating material, and is characterized in that the repairing material comprises a component A and a component B, wherein the component A comprises 30-50 parts of bisphenol A type liquid epoxy resin; 3-10 parts of a diluent; 5-10 parts of a nano modifier and 40-60 parts of quartz powder, wherein the component B comprises a composite modified amine curing agent, the impregnating material comprises a component C and a component D, and the component C comprises 80-90 parts of bisphenol A type liquid epoxy resin; 3-10 parts of a diluent; 1-3 parts of coupling agent and 1-7 parts of other auxiliary agents, wherein the component D comprises a composite modified amine curing agent.

2. The utility model provides a construction method of reinforcement material of gas overhead pipeline, its characterized in that, including metal pipeline (1) and construction step, construction step is including surface treatment, pipeline defect repair material, pipeline reinforcement impregnating material, winding glass fiber cloth and finished product combined material's protection, the top outer wall of metal pipeline (1) sets up defective part (2), and the inner wall of defective part (2) is filled with repair material (3), other positions of repair material (3) and metal pipeline (1) are leveled, the outer winding glass fiber cloth (4) of metal pipeline (1), and the impregnating compound (5) has been paintd in the outside of glass fiber cloth (4).

3. The reinforcing material and construction method of the gas overhead pipeline according to claim 2, wherein the surface treatment comprises the following steps:

1) removing the original anticorrosive coating of the metal pipeline (1), wherein the length of the anticorrosive coating at least exceeds 50mm of each of two sides of the defect to be repaired, no obvious old coating residue exists on the surface after removal, and damage to the metal of the pipeline body is avoided in the removing process; the removed old anticorrosive coating cannot be discarded on site and needs to be treated uniformly;

2) the reinforcing construction is generally carried out within 4 hours after the surface base layer of the pipe is treated, so as to avoid the reoxidation of the surface; if the specified time is exceeded, surface rust removal needs to be carried out again; the pretreatment quality of the base layer reaches St3 grade specified in GB/T8923-1988: the steel surface should not have visible grease and dirt, and have no attachments such as scale, rust, paint coating and the like which are not firmly attached; the rust removal grade is more thorough than that of St2, and the surface of the exposed part of the substrate has obvious metal luster;

3) paying off and positioning the part needing to be reinforced before construction, and marking;

4) after the surface treatment is carried out on the defect points, the defect points are firstly confirmed, the depth and the axial length of the defect points are tested by utilizing a ruler and an ultrasonic thickness gauge, and the defect points are recorded, photographed and filed. The internal corrosion defect is indirectly measured by an ultrasonic thickness gauge, and the thickness can be measured by drawing grid lines on the surface of the pipeline one by one; when the axial length of the defect is measured, if the distance between two corrosion defects is less than 25mm, the two corrosion defects are regarded as the same corrosion defect; when the defect corrosion width is measured, if the distance between two corrosion defects is less than 6 times of the wall thickness, the two corrosion defects are also regarded as the same corrosion defect;

after the original anticorrosive coating and oxides on the surface of the steel pipe are removed and before the composite material is installed, the surface of the steel pipe is cleaned by using an antioxidant special cleaning agent and is fully dried.

4. The method for constructing a reinforcing material for a gas overhead pipe according to claim 2, wherein the material for repairing a pipe defect comprises the following steps:

s1: according to the pipe surface temperature and the proportion specification of a product specification (repair material A: B is 10: 1), mixing a high-strength repair material group, fully stirring, uniformly mixing, and visually observing without color difference;

s2: filling the mixed high-strength repair material into all external defects (honeycombs, pitted surfaces, small holes and the like) on the surface of the pipeline and two sides of a spiral welding line or a circumferential welding line until the filler is completely filled, leveling and repairing, wherein the positions of corrosion defects are repaired by adopting a special repair agent to form hard substances similar to steel and iron, and the hard substances have a good bonding effect with the surface of the steel;

s3: after the defect repairing material is completely filled, curing time is generally 8-12 hours at normal temperature, and the repaired part needs to be ensured to be clean and dry during curing; when the temperature is lower in winter, the curing speed can be accelerated by using heating measures, and the heating temperature should not exceed 80 ℃.

5. The construction method of the reinforcing material for the gas overhead pipe according to claim 4, wherein the winding of the glass fiber cloth comprises the steps of:

s4: the defect part of the tube body is arranged in the middle of the fiber cloth, and the distance between the edge of the defect and the edge of the fiber cloth is not less than 50m when the tube body is installed for the defect with longer longitudinal direction;

s5: the initial position of the fiber cloth is positioned at the position of 2 points (clockwise winding) or 10 points (anticlockwise winding) of the pipeline, the high-strength viscose is coated on the annular direction of the pipeline before the first layer is wound, after the first layer is wound for a circle, the fiber cloth is fully soaked by resin until no dry point exists, then the second layer is wound, the uniformly mixed viscose is uniformly coated on the fiber cloth by using a brush, then the glass fiber cloth is wound, and the process is repeated;

s6: the fiber cloth is wound on the outer surface of the pipeline at the repaired part with proper force, and in-situ winding is adopted until the number of layers required by construction design is reached;

s7: and each layer of wet-process repair composite material is wound, and a special tool is required to drive and press the wet-process repair composite material.

6. The construction method of the reinforcement material for the gas overhead pipeline according to claim 5, wherein the protection of the finished composite material comprises the steps of:

s8: in the weather with sand and dust, sand prevention measures must be taken during the construction process and on the composite material which is constructed but not solidified until the composite material suite is solidified;

s9: in rainy days, waterproof measures must be taken during the construction process and on the composite material which is constructed but not cured until the composite material suite is cured;

s10: when the construction is carried out at the temperature of less than 10 ℃ on the surface of the pipe or the environment, heating measures are adopted to promote the curing of the composite material, and the heating temperature is not more than 60 ℃;

s11: in the process of curing the composite material, if the repair part is easily influenced by the underground water of the pipe ditch, water pumping and drainage measures and the conditions of soil wall stability and support firmness are checked according to relevant regulations in Q/SY1247-2009 safety management Specification for excavation work until the composite material is cured.

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