CN114440051A - Electrothermal repair method for glass steel tube - Google Patents
Electrothermal repair method for glass steel tube Download PDFInfo
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- CN114440051A CN114440051A CN202011217265.9A CN202011217265A CN114440051A CN 114440051 A CN114440051 A CN 114440051A CN 202011217265 A CN202011217265 A CN 202011217265A CN 114440051 A CN114440051 A CN 114440051A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
- F16L55/168—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe
- F16L55/175—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe by using materials which fill a space around the pipe before hardening
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/18—Appliances for use in repairing pipes
Abstract
The invention discloses an electrothermal repair method of a glass steel tube, and relates to the technical field of pipeline repair. The method is realized by coating a repair layer comprising an anti-seepage layer, an enhancement layer and a heating layer on the glass steel pipe; the impermeable layer comprises a glass fiber surface felt and epoxy resin or glass fiber winding yarns and epoxy resin; the reinforced layer comprises glass cloth and epoxy resin; the heating layer comprises carbon fiber heating wires and epoxy resin. The method can solve the technical problems of long repair time and insufficient strength in the prior art, and prolong the service life of the glass reinforced plastic pipe.
Description
Technical Field
The invention relates to the technical field of pipeline repair, in particular to an electrothermal repair method of a glass steel pipe.
Background
The glass fiber reinforced plastic pipeline is a light, high-strength and corrosion-resistant nonmetal pipeline, and is made by winding glass fiber with resin matrix weight on a rotating core mould layer by layer according to the technological requirements, and uniformly laying quartz sand between the fibers at a long distance to form a sand inclusion layer. On the premise of meeting the use strength, the rigidity is improved, and the stability and the reliability of the pipeline are ensured. The glass fiber reinforced plastic sand inclusion pipe has excellent chemical corrosion resistance, light weight, high strength, no scaling, strong shock resistance and long service life compared with common steel pipes, and is laid by glass fiber reinforced plastic pipelines in many projects at present. However, once the glass fiber reinforced plastic pipeline is damaged, the repair is a big problem.
The existing repair method of the glass fiber reinforced plastic pipeline mainly comprises three methods: (1) replacing and repairing the short section of the steel pipe: firstly, cutting off a damaged section of glass reinforced plastic pipe, and manufacturing two glass reinforced plastic ports into conical surfaces on site; then replacing the damaged section position of the original glass fiber reinforced plastic pipe with two new steel pipes, wherein the outer ends of the two replacement pipes are conical surfaces and are adhered to the glass fiber reinforced plastic pipe by using an adhesive; then, the inner ends of the two steel pipes are flat openings, and the final opening collision is carried out by adopting a welding mode; the main disadvantage of this method is that the repaired metal part still has corrosion problems. In particular, the glass fiber reinforced plastic pipe adopted in engineering design is generally a pipeline with serious medium corrosivity; (2) and (3) repairing the glass fiber reinforced plastic hand paste: preparing resin glue solution on site, soaking glass fiber and glass fiber fabrics in the resin, coating the resin glue solution on a leakage part according to a certain layering sequence, and waiting for a period of time for natural curing and forming; the method has two main disadvantages: firstly, because of adopting a glass fiber and unsaturated polyester resin system, the strength is low, and only glass fiber reinforced plastic pipelines with the low pressure within 1.6MPa can be maintained; secondly, the curing is slow, the curing time is usually 4 hours for summer environment construction, and the curing time is 24 hours for winter environment construction, and the repair application of the glass fiber reinforced plastic pipeline has great limitation due to the two defects of the hand lay-up process; (3) and (5) punching a card and repairing: opening the rubber ring sealing element by using a clamp, aligning the rubber ring sealing element with a leakage position, and then fastening a clamp to enable the rubber ring to play a sealing role; this method has two problems: firstly, the rubber ring has short service life and is usually used as a temporary repair means, and secondly, the low-pressure glass steel pipeline within 1.6MPa can only be maintained.
Chinese patent application 200410084164.3 discloses a method for repairing and reinforcing the outer wall corrosion defect of oil and gas transmission pipeline by using composite material and the composite material thereof, which is characterized in that the method comprises using reinforced composite material sheet, defect filling material and interlayer adhesive to repair and reinforce the defect part, wherein the reinforced composite material sheet is made of high-strength glass fiber unidirectional cloth or carbon fiber unidirectional cloth and epoxy resin glue containing 593 curing agent or triethanolamine curing agent and acrylate liquid rubber, the interlayer adhesive is used for the reinforcement, the defect part is only needed to be treated on the surface properly, then the defect part is filled with the reinforcing filling material, then the reinforcing coiled sheet is wrapped on the pipeline, the interlayer adhesive and the curing agent are used between the sheets without welding, the pipeline can reach the pressure bearing capacity under the defect-free state after the repair, and the defect with the depth reaching more than half of the pipe wall thickness, when the full-size hydraulic pressure blasting is carried out on the pipeline, the defect part does not leak or crack, and the blasting port appears at the defect-free part of the pipeline. The curing agent has long curing time, and the carbon fiber composite sheet has the highest tensile strength of 1480MPa and still has a high lifting space.
The emergency treatment method for the breakage of the glass reinforced plastic pipe in the Chinese patent application 201910239971.4 comprises the following steps: s1: drying the water leakage pipeline, blowing for 15-30 minutes, and aligning an air outlet to a pipeline crack; s2: cleaning and polishing the broken part of the pipeline by using a grinding machine in a dry state until the broken part is polished to be smooth; s3: coating a curing agent and epoxy resin at the fracture part, wherein the ratio of the curing agent to the epoxy resin is 1: 4 to 1: 2; s4: wrapping the broken part of the glass fiber reinforced plastic pipe body with glass fiber cloth, continuously and uniformly coating epoxy resin in a layering manner in the wrapping process, and determining the number of winding layers according to pressure requirements; s5: and finally, drying at normal temperature, and recovering water supply after drying for 72 hours. The invention has the effect of conveniently making up the tiny breakage of the glass steel tube body part, but has the defect of long treatment time.
In view of the above, the invention provides an electrothermal repair method for a glass steel tube, which can solve the technical problems of long time and insufficient strength in the prior art and prolong the service life of the glass steel tube.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the electrothermal repair method for the glass steel tube, which can repair high-pressure engineering and has high strength, high repair speed and wide application range.
In order to achieve the purpose, the invention provides an electric heating repair method of a glass steel pipe, which is realized by coating a repair layer comprising an impermeable layer, a reinforcing layer and a heating layer on the glass steel pipe.
The impermeable layer comprises a glass fiber surface felt and epoxy resin or glass fiber winding yarns and epoxy resin;
the reinforced layer comprises glass cloth and epoxy resin;
the heating layer comprises carbon fiber heating wires and epoxy resin.
Preferably, the epoxy resin is selected from anhydride, alicyclic amine or aromatic amine cured bisphenol A type epoxy resin; a polyfunctional epoxy resin; one or more heterocyclic epoxy resins, and more preferably an alicyclic amine-cured bisphenol a epoxy resin.
Preferably, the total thickness of the repair layer is 12-16 mm.
Preferably, the above method comprises the steps of:
(1) coating an impermeable layer at the leakage position;
(2) coating 3-5 layers of composite layers on the anti-seepage layer to obtain a repairing layer;
(3) and electrifying and heating to solidify the repairing layer.
The composite layer comprises 3-5 impermeable reinforcing layers and 1 heating layer; the anti-seepage enhancement layer comprises 1 enhancement layer and 1 anti-seepage layer.
Further preferably, the method comprises the steps of:
(1) after impregnating the glass fiber surface felt with epoxy resin, coating a leakage part, and executing 1 layer;
(2) soaking glass fiber glass cloth in epoxy resin, coating the glass fiber glass cloth at a leakage position, and executing 1 layer;
(3) soaking the glass fiber winding yarn with epoxy resin, coating the yarn at a leakage position, and executing 1 layer;
(4) circulating the steps (2) to (3) for 3-5 times;
(5) soaking the carbon fiber heating wire with epoxy resin, coating the carbon fiber heating wire at a leakage position, and executing 1 layer;
(6) circulating the steps (2) to (5) for 3-5 times, measuring the outer diameter, and calculating the total thickness of the repairing layer to 12-16 mm;
(7) and electrifying on site to uniformly heat each layer, and curing the repair layer at high temperature.
Preferably, in the above steps, the impregnation is carried out by immersing the glass fiber or the carbon fiber in an epoxy resin liquid, the glass fiber needs to reach a degree that the visual color is changed from white to transparent, and the carbon fiber needs to be immersed for more than 10 seconds.
Preferably, the energization in step (7) is energization of the heating layer.
Preferably, the heating temperature in step (7) is 100-140 ℃.
Preferably, when the local leakage is repaired by the method, the method further comprises the following steps before the step (1): and (5) polishing the surface of the repair part with local leakage and the repair surface of the glass fiber reinforced plastic pipeline.
Preferably, when the method is used for repairing large-area leakage, the method further comprises the following steps before the step (1): and cutting a lower leakage section, polishing the end part of the glass fiber reinforced plastic short section of the replacement pipe to form a butt joint groove at the replacement pipe replacement position of the glass fiber reinforced plastic replacement pipe with the same specification, and filling the winding yarns to the groove part until the winding yarns are flush with the outer diameter of the pipe after being soaked in epoxy resin.
Compared with the prior art, the invention has the following beneficial effects:
(1) the carbon fiber heating wire is used as a heating layer, one layer is arranged about every 3-5mm, the uniform heating effect can be realized, the strength is high, and the tensile strength of the repairing layer can reach 2500 MPa;
(2) after the unsaturated polyester resin of the traditional hand lay-up process is replaced by the epoxy resin, the tensile/shear strength performance and the bonding performance are greatly improved, so that high-pressure engineering can be repaired, and meanwhile, the epoxy resin and the carbon fiber have good interfacial compoundability, so that the strength of the carbon fiber can be exerted, and the repair pressure is further improved;
(3) the repairing speed is high, the curing time is not more than 1h, and the whole repairing time (the paving and reinforcing process) is not more than 1.5 h;
(4) the application range is wide, the conditions of local leakage and large-area leakage can be repaired, and the device is suitable for any caliber.
Drawings
FIG. 1 is a schematic illustration of a partial leak repair;
FIG. 2 is a schematic illustration of large area leak repair.
Detailed Description
The present invention will be further explained with reference to specific examples in order to make the technical means, the technical features, the technical objectives and the effects of the present invention easier to understand, but the following examples are only preferred embodiments of the present invention, and not all embodiments of the present invention. In the interest of clarity, not all features of an actual implementation are described. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. It will of course be appreciated that in the development of any such actual embodiment, numerous implementation-specific details must be set forth in order to achieve the developer's specific goals. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative efforts belong to the protection scope of the present invention.
In order to make the objects and features of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. It is to be noted that the drawings are in a very simplified form and are all used in a non-precise ratio for the purpose of facilitating and clearly aiding in the description of the embodiments of the invention.
The experimental procedures in the following examples were carried out in a conventional manner unless otherwise specified, and materials, reagents and the like used in the following examples were commercially available unless otherwise specified.
In the embodiment described below, it is preferred that,
the glass fiber surface felt is purchased from Kaifengpengyuan company, and has the product number of ECR-30-200;
the glass fiber glass cloth is purchased from glass fiber company of Taishan mountain, and the product number is EWR 400-100;
the glass fiber winding yarn is purchased from China megalite corporation, and has the product number of EDR 24-2400-;
the alicyclic amine cured epoxy resin system is purchased from the Dow chemical company, and the resin cargo number is DER-672A; the matched curing agent is alicyclic amine DER-672B;
the multifunctional epoxy resin system is purchased from a novel material of Whiteflower, the resin is AF-4080A, and the matched curing agent is AF-4080B;
carbon fibers were purchased from Toho, Japan under the designation T-300/24K.
Example 1
Local leak repair DN65-16MPa pipeline:
polishing the surface of the repair part with local leakage and the repair surface of the glass fiber reinforced plastic pipeline by using a polishing machine until fibers are exposed, and then repairing according to the following steps:
(1) impregnating the glass fiber surface felt with epoxy resin, coating a leakage part, and executing 1 layer;
(2) soaking glass fiber glass cloth in epoxy resin, coating the glass fiber glass cloth at a leakage position, and executing 1 layer;
(3) soaking the glass fiber winding yarn with epoxy resin, coating the yarn at a leakage position, and executing 1 layer;
(4) circulating the steps (2) to (3) for 5 times;
(5) soaking the carbon fiber heating wire with epoxy resin, coating the carbon fiber heating wire at a leakage position, and executing 1 layer;
(6) circulating the steps (2) to (5) for 3 times, measuring the outer diameter, and calculating the total thickness of the repairing layer to 12 mm;
(7) electrifying the heating layer by a heating connecting wire to uniformly heat each layer, curing the repairing layer at a high temperature of 120 ℃, and putting into production and running.
The epoxy resin is alicyclic amine cured bisphenol A epoxy resin.
The formed repairing layer is as shown in figure 1, after the surface of a leakage channel 6 on the pipe wall 4 is polished, an impermeable layer 3, a reinforcing layer 2 and a heating layer 1 are coated, the heating layer 1 is electrified and heated through a heating connecting wire 5, solidification is completed, and the leakage of a medium 7 in the pipe can be effectively prevented.
Example 2
And (3) large-area leakage repair of DN150-7MPa pipeline:
cutting a lower leakage section, replacing a pipe with a glass fiber reinforced plastic replacement pipe in the same specification, polishing the end part of a glass fiber reinforced plastic short section of the replacement pipe by using a polishing machine until fibers are exposed, forming a butt joint groove with the taper of 5-15 degrees, soaking the winding yarns in epoxy resin, filling the epoxy resin into the groove until the epoxy resin is flush with the outer diameter of the pipe, and then repairing according to the following steps:
(1) impregnating the glass fiber surface felt with epoxy resin, coating a leakage part, and executing 1 layer;
(2) soaking glass fiber glass cloth in epoxy resin, coating the glass fiber glass cloth at a leakage position, and executing 1 layer;
(3) soaking the glass fiber winding yarn with epoxy resin, coating the yarn at a leakage position, and executing 1 layer;
(4) circulating the steps (2) to (3) for 3 times;
(5) soaking the carbon fiber heating wire with epoxy resin, coating the carbon fiber heating wire at a leakage position, and executing 1 layer;
(6) circulating the steps (2) to (5) for 5 times, measuring the outer diameter, and calculating the total thickness of the repairing layer to 13 mm;
(7) electrifying the heating layer by a heating connecting wire to uniformly heat each layer, curing the repairing layer at a high temperature of 120 ℃, and putting into production and running.
The epoxy resin is alicyclic amine cured bisphenol A epoxy resin.
The formed repairing layer is as shown in figure 2, the end part of the replacing pipe glass fiber reinforced plastic short section is polished to form a groove 6, the impermeable layer 3, the enhancement layer 2 and the heating layer 1 are coated, the heating layer 1 is electrified and heated through the heating connecting wire 5, solidification is completed, and the leakage of a medium 7 in the pipe 4 can be effectively prevented.
Example 3
Unlike example 1, the epoxy resin was replaced with a multifunctional epoxy resin, and the rest were the same.
Comparative example 1
The difference from the embodiment 1 is that the repairing layer has no heating layer, is not electrified and heated, and the rest is the same, and the concrete steps are as follows:
polishing the surface of the repair part with local leakage and the repair surface of the glass fiber reinforced plastic pipeline by using a polishing machine until the fiber surface is exposed, and then repairing according to the following steps:
(1) after impregnating the glass fiber surface felt with epoxy resin, coating a leakage part, and executing 1 layer;
(2) soaking glass fiber glass cloth in epoxy resin, coating the glass fiber glass cloth on a leakage position, and executing 1 layer;
(3) soaking the glass fiber winding yarn with epoxy resin, coating the yarn at a leakage position, and executing 1 layer;
(4) circulating the steps (2) to (3) for 15 times, measuring the outer diameter, and calculating the total thickness of the repairing layer to reach 10 mm;
(5) and (5) after the repairing layer is solidified, putting into production and running.
Result detection
The composite layers prepared in examples 1 to 3 and comparative example 1 were subjected to property tests, and the test items and the corresponding test methods are shown in table 1:
table 1.
The test results of examples 1 to 3 and comparative example 1 are shown in table 2:
table 2.
The detection result of the embodiment shows that the composite layer prepared by repairing local leakage and large-area leakage has the tensile strength of 409MPa, the bending strength of 135MPa, the glass transition temperature of 122 ℃, the repairing speed is high, the curing time is not more than 1h, and the high-pressure glass fiber reinforced plastic pipeline can be repaired.
From the data of example 3, it is seen that after the bisphenol A epoxy resin is replaced by the multifunctional epoxy resin, the glass transition temperature reaches 189 ℃, the glass reinforced plastic pipe with the engineering temperature of 130 ℃ can be repaired, the curing time does not exceed 1h, and the high-pressure glass reinforced plastic pipe can be repaired.
The invention proves that the tensile/shear strength performance and the adhesive property of the selected epoxy resin are greatly improved, the high-pressure engineering can be repaired, the repairing speed is high, meanwhile, the epoxy resin and the carbon fiber have good interface composite property, the strength of the carbon fiber can be exerted, and the repairing pressure is further improved.
The foregoing shows and describes the general principles, essential features and advantages of the invention, which is, therefore, described only as an example of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but rather that the invention includes various equivalent changes and modifications without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed.
Claims (10)
1. An electric heating repair method of a glass steel tube is characterized in that the method is realized by coating a repair layer comprising an anti-seepage layer, a reinforcing layer and a heating layer on the glass steel tube;
the impermeable layer comprises a glass fiber surface felt and epoxy resin or glass fiber winding yarns and epoxy resin; the reinforced layer comprises glass cloth and epoxy resin; the heating layer comprises carbon fiber heating wires and epoxy resin.
2. The method of claim 1, wherein the epoxy resin is selected from anhydride, alicyclic amine, or aromatic amine cured bisphenol a type epoxy resins; a polyfunctional epoxy resin; one or more heterocyclic epoxy resins.
3. The method of claim 1, wherein the repair layer has an overall thickness of 12-16 mm.
4. The method of claim 1, comprising the steps of:
(1) coating an impermeable layer at the leakage position;
(2) coating 3-5 layers of composite layers on the anti-seepage layer to obtain a repairing layer;
(3) electrifying and heating to solidify the repairing layer;
each composite layer comprises 3-5 impermeable reinforcing layers and 1 heating layer; each barrier-enhancing layer comprises 1 enhancing layer and 1 barrier layer.
5. The method according to claim 1 or 4, characterized in that it comprises in particular the steps of:
(1) after impregnating the glass fiber surface felt with epoxy resin, coating a leakage part, and executing 1 layer;
(2) soaking glass fiber glass cloth in epoxy resin, coating the glass fiber glass cloth at a leakage position, and executing 1 layer;
(3) soaking the glass fiber winding yarn with epoxy resin, coating the yarn at a leakage position, and executing 1 layer;
(4) circulating the steps (2) to (3) for 3-5 times;
(5) soaking the carbon fiber heating wire with epoxy resin, coating the carbon fiber heating wire at a leakage position, and executing 1 layer;
(6) circulating the steps (2) to (5) for 3-5 times, measuring the outer diameter, and calculating the total thickness of the repairing layer to 12-16 mm;
(7) and electrifying on site to uniformly heat each layer, and curing the repairing layer at high temperature.
6. The method as claimed in claim 5, wherein the impregnation is carried out by immersing the glass fibers or the carbon fibers in an epoxy resin liquid, wherein the glass fibers are required to reach a degree that the color is visually changed from white to transparent, and the carbon fibers are required to be immersed for more than 10 seconds.
7. The method of claim 5, wherein said energizing of step (7) is energizing a heating layer.
8. The method as claimed in claim 5, wherein the heating temperature in step (7) is 100-140 ℃.
9. The method of claim 5, wherein in repairing the localized leak, prior to step (1), further comprising the steps of: and (5) polishing the surface of the repair part with local leakage and the repair surface of the glass fiber reinforced plastic pipeline.
10. The method according to claim 5, wherein, when repairing large area leakage, before step (1), the method further comprises the steps of: and cutting a lower leakage section, polishing the end part of the glass fiber reinforced plastic short section of the replacement pipe to form a butt joint groove at the replacement pipe replacement position of the glass fiber reinforced plastic replacement pipe with the same specification, and filling the winding yarns to the groove part until the winding yarns are flush with the outer diameter of the pipe after being soaked in epoxy resin.
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| CN202011217265.9A CN114440051A (en) | 2020-11-04 | 2020-11-04 | Electrothermal repair method for glass steel tube |
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| CN202011217265.9A CN114440051A (en) | 2020-11-04 | 2020-11-04 | Electrothermal repair method for glass steel tube |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115555797A (en) * | 2022-11-18 | 2023-01-03 | 中国科学院合肥物质科学研究院 | Insulation repair structure and repair method for high-voltage measuring line fracture |
| CN117264366A (en) * | 2023-08-31 | 2023-12-22 | 上海管康技术有限公司 | Local emergency repair material for binary pipeline and repair method thereof |
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| CN117264366A (en) * | 2023-08-31 | 2023-12-22 | 上海管康技术有限公司 | Local emergency repair material for binary pipeline and repair method thereof |
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