CN110005905B - Method for repairing pipeline by using steel epoxy sleeve - Google Patents
Method for repairing pipeline by using steel epoxy sleeve Download PDFInfo
- Publication number
- CN110005905B CN110005905B CN201910315110.XA CN201910315110A CN110005905B CN 110005905 B CN110005905 B CN 110005905B CN 201910315110 A CN201910315110 A CN 201910315110A CN 110005905 B CN110005905 B CN 110005905B
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- China
- Prior art keywords
- steel
- sleeve
- epoxy resin
- epoxy
- annular cavity
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 118
- 239000010959 steel Substances 0.000 title claims abstract description 118
- 239000004593 Epoxy Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000003822 epoxy resin Substances 0.000 claims abstract description 50
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 50
- 230000007547 defect Effects 0.000 claims abstract description 13
- 239000003566 sealing material Substances 0.000 claims abstract description 4
- 238000011010 flushing procedure Methods 0.000 claims abstract description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000005452 bending Methods 0.000 abstract description 7
- 238000003466 welding Methods 0.000 description 8
- 238000009991 scouring Methods 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 238000001802 infusion Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000010412 perfusion Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pipe Accessories (AREA)
Abstract
The invention discloses a method for repairing a pipeline by using a steel epoxy sleeve, which comprises the following steps: the steel sleeve is sleeved at a to-be-repaired defect of the pipe body, the rectangular steel wire mesh is placed in the annular cavity, the steel wire mesh is rolled into a cylinder shape, two ends of the annular cavity are sealed through sealing materials, the annular cavity is vacuumized through a vacuum pump, then epoxy resin is poured, a valve opening in the bottom of the steel sleeve is opened, the epoxy resin flows out, the process that the epoxy resin flows out erodes the inner wall of the steel sleeve and the outer wall of the pipe body, and after the steel sleeve and the pipe body are repeatedly eroded for a plurality of times, the steel sleeve is poured and molded. The invention has the advantages that: (1) the repeated flushing ensures that no air bubbles exist at the interface of the epoxy resin and the steel sleeve and the interface of the epoxy resin and the pipe body, so that the integral bearing capacity of the steel epoxy sleeve after pouring and forming is improved; (2) the steel wire mesh is combined with the epoxy resin layer, so that the bending resistance of the steel epoxy sleeve after pouring and forming is improved.
Description
Technical Field
The invention relates to a method for repairing a pipeline, in particular to a method for repairing a pipeline by using a steel epoxy sleeve, and belongs to the technical field of pipeline repair.
Background
The existing high-steel-grade large-pipe-diameter conveying pipeline has a trend of continuously improving the defect repairing requirements, and the defects of the traditional pipeline defect repairing technology are obvious.
Tube body defects mainly fall into four categories: metal loss, cracks, distortion, weld defects.
At present, the common domestic defect repair methods comprise: repair welding, plate repair, repair of an A-type sleeve, repair of a B-type sleeve, repair of a steel epoxy sleeve, repair of a composite material, addition of a mechanical clamp, addition of a lining, pipe replacement and the like.
For more serious pipe body or welding seam defects, the most adopted repairing method is as follows: repairing an A-type sleeve, repairing a B-type sleeve, repairing a composite material and repairing a steel epoxy sleeve. However, these repair methods have their respective limitations, in particular:
(1) repairing the A-type sleeve: the defects of axial pressure bearing and corrosion leakage can not be repaired;
(2) b-type sleeve repair: the welding device can bear axial and circumferential pressure, but needs to be welded with a pipe body, the welding operation has strict requirements on an oil-gas pipeline, the welding heat can directly influence the construction safety, explosion accidents are easy to occur, and hydrogen embrittlement can occur in the welding operation;
(3) repairing the composite material: welding operation is not needed, the repairing effect is good, but the cost and the safety of the repairing material need to be considered;
(4) repairing the steel epoxy sleeve: the welding operation is not needed, other operations are safe, but some performances (such as bending resistance and integral pressure-bearing capacity) after pouring and forming are difficult to guarantee.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a method for repairing a pipeline by using a steel epoxy sleeve, which can ensure that the bending resistance and the integral pressure-bearing capacity of the steel epoxy sleeve are improved after pouring and forming.
In order to achieve the above object, the present invention adopts the following technical solutions:
a method for repairing a pipeline by using a steel epoxy sleeve is characterized by comprising the following steps:
step 1: sleeving a steel sleeve at the position of the pipe body where the defect is to be repaired, and forming an annular cavity between the steel sleeve and the pipe body;
step 2: placing a rectangular steel wire mesh into the annular cavity, rolling the steel wire mesh into a cylinder shape, and then fixedly connecting the butted edges of the steel wire mesh together;
step 3: sealing the two ends of the annular cavity by a sealing material;
step 4: vacuumizing the annular cavity, then pouring epoxy resin into the annular cavity from the top, and closing the feed valve when all exhaust holes of the steel sleeve are filled with epoxy resin;
step 5: opening a valve opening at the bottom of the steel sleeve to enable epoxy resin in the steel sleeve to flow out from the valve opening, and closing the valve opening when the epoxy resin cannot flow out continuously;
step 6: repeating Step4 and Step5 for multiple times, and repeatedly flushing the inner wall of the steel sleeve and the outer wall of the pipe body by using epoxy resin;
step 7: and (3) filling epoxy resin into the annular cavity, closing the feed valve when epoxy resin overflows from all exhaust holes of the steel sleeve, and finally standing to form the epoxy resin.
The method for repairing the pipeline by using the steel epoxy sleeve is characterized in that in Step1, the steel sleeve is provided with three filling ports, two exhaust ports and a valve port, the three filling ports and the two exhaust ports are arranged at the top of the steel sleeve, wherein the two filling ports are respectively close to the left end and the right end of the steel sleeve, the other filling port is positioned in the middle of the steel sleeve, and the two exhaust ports are respectively positioned in the middle of the two adjacent filling ports; the valve opening is arranged at the bottom of the steel sleeve and is positioned in the middle of the steel sleeve.
The method for repairing the pipeline by using the steel epoxy sleeve is characterized in that in Step2, the diameter of the steel wire mesh is 4-8mm larger than the outer diameter of the pipe body after the steel wire mesh is rolled into a cylindrical shape.
The method for repairing the pipeline by using the steel epoxy sleeve is characterized in that in Step3, after two ends of the annular cavity are sealed, the annular cavity is kept still for 24 hours.
The method for repairing a pipeline using a steel epoxy sleeve is characterized in that the annular cavity is evacuated to-0.8 MPa in Step 4.
The method for repairing a pipeline using a steel epoxy sleeve is characterized in that Step4 and Step5 are repeated 3 to 5 times in Step 6.
The method for repairing the pipeline by using the steel epoxy sleeve is characterized in that the standing time in Step7 is 24 hours.
The method for repairing the pipeline by using the steel epoxy sleeve is characterized in that the operating environment temperature is room temperature, and the temperature of the epoxy resin is 30-35 ℃.
The invention has the advantages that:
(1) the inner wall of the steel sleeve and the outer wall of the pipe body are repeatedly flushed by the epoxy resin, so that the interface between the epoxy resin and the steel sleeve and the interface between the epoxy resin and the pipe body are free of air bubbles, the epoxy resin can be tightly combined with the steel sleeve after the pouring and forming, and the integral pressure-bearing capacity of the steel epoxy sleeve after the pouring and forming is improved;
(2) the steel wire mesh is placed in the annular cavity, so that the bending resistance of the epoxy resin layer after pouring and forming is improved, and the bending resistance of the steel epoxy sleeve after pouring and forming is also improved;
(3) the operating process has low requirements on operators;
(4) the site operation is simple and flexible, and the cost is low.
Drawings
FIG. 1 is a schematic representation of a method of repairing a pipe using a steel epoxy sleeve in accordance with the present invention;
fig. 2 is a cross-sectional view of a steel epoxy sleeve after infusion forming.
The meaning of the reference symbols in the figures:
1-a pipe body, 2-a steel sleeve, 3-an epoxy resin layer and 4-a steel wire mesh;
21-filling port, 22-exhaust hole, 23-filling port, 24-exhaust hole, 25-filling port, 26-fastening bolt, 27-bottom valve port and 28-positioning bolt.
Detailed Description
The invention is described in detail below with reference to the figures and the embodiments.
One, steel sleeve
Referring to fig. 1, a steel sleeve 2 used in the present invention has:
(1) three perfusion ports: the pouring device comprises a pouring port 21, a pouring port 23 and a pouring port 25, wherein the pouring port 21 and the pouring port 25 are respectively close to the left end and the right end of the steel sleeve 2, the pouring port 23 is positioned in the middle of the steel sleeve 2, and the three pouring ports are all arranged at the top of the steel sleeve 2;
(2) two exhaust holes: the exhaust holes 22 and the exhaust holes 24 are also arranged at the top of the steel sleeve 2 and are respectively positioned between two adjacent filling openings;
(3) a valve port: the valve opening 27 is arranged at the bottom of the steel sleeve 2, and the valve opening 27 is positioned in the middle of the steel sleeve 2.
Second, repair
Temperature of the operating environment: and (4) room temperature.
Temperature of epoxy resin: 30-35 ℃.
Referring to fig. 1, the method for repairing a pipeline by using a steel epoxy sleeve provided by the invention specifically comprises the following steps:
step 1: sleeve made of steel
The steel sleeve 2 is sleeved at the position of the pipe body 1 where the defect is to be repaired, and an annular cavity is formed between the steel sleeve 2 and the pipe body 1.
Step 2: with steel wire mesh
And placing the rectangular steel wire mesh into the annular cavity, rolling the steel wire mesh into a cylindrical shape, and then fixedly connecting the butted edges of the steel wire mesh together.
After the steel wire mesh is rolled into a cylinder shape, the diameter of the steel wire mesh is more than 5mm of the outer diameter of the pipe body 1, and the steel wire mesh is most suitable.
Step 3: seal for a motor vehicle
The two ends of the annular cavity are sealed by a sealing material and then left standing for 24 h.
Step 4: impregnated epoxy resin
And (3) carrying out vacuum pumping treatment on the annular cavity by using a vacuum pump, reducing the pressure to-0.8 MPa, then pouring epoxy resin into the annular cavity through a pouring port 21, a pouring port 23 and a pouring port 25 which are positioned at the top of the steel sleeve 2, and closing the feeding valve when epoxy resin overflows from an exhaust hole 22 and an exhaust hole 24 which are positioned at the top of the steel sleeve 2.
The bubbles mixed in the epoxy resin can be discharged, some bubbles can still be reserved on the interface of the epoxy resin and the steel sleeve 2 and the interface of the epoxy resin and the pipe body 1, and the bubbles reserved on the interface can influence the combination performance of the epoxy resin and the steel sleeve 2 after pouring and forming, so that the integral pressure-bearing capacity of the steel epoxy sleeve can be influenced.
Step 5: scouring the walls of tubes and tubes
And opening a valve port 27 at the bottom of the steel sleeve 2 to enable epoxy resin in the steel sleeve 2 to flow out of the valve port 27, and closing the valve port 27 when the epoxy resin in the steel sleeve 2 cannot continuously flow out.
Epoxy in the steel sleeve 2 is at the in-process that flows out from valve gate 27, and epoxy can form certain scouring action to the inner wall of steel sleeve 2 and the outer wall of body 1, and this scouring action can wash away the bubble on the interface of epoxy and steel sleeve 2 and the bubble on the interface of epoxy and body 1 to make epoxy can closely combine together with steel sleeve 2 after the infusion takes shape, and then make the holistic bearing capacity of steel epoxy sleeve promote.
Step 6: repeatedly scouring
Repeating Step4 and Step53-5 times, and repeatedly washing the inner wall of the steel sleeve 2 and the outer wall of the pipe body 1 with the epoxy resin to ensure that no air bubbles exist at the interface between the epoxy resin and the steel sleeve 2 and the interface between the epoxy resin and the pipe body 1.
Step 7: pouring and forming
And (3) pouring epoxy resin into the annular cavity, closing the feeding valve when epoxy resin overflows from the vent holes 22 and 24 on the top of the steel sleeve 2, and standing for 24 hours to mold the epoxy resin.
Referring to fig. 2, after the epoxy resin is molded, the steel wire mesh 4 is fixed in the epoxy resin layer 3 and is fused with the epoxy resin into a whole, and the presence of the steel wire mesh 4 greatly improves the bending resistance of the epoxy resin layer 3, so that the bending resistance of the whole steel epoxy sleeve is improved.
It should be noted that the above-mentioned embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the protection scope of the present invention.
Claims (7)
1. A method for repairing a pipeline by using a steel epoxy sleeve is characterized by comprising the following steps:
step 1: sleeving a steel sleeve at a to-be-repaired defect of a pipe body, wherein the steel sleeve is provided with three filling ports, two exhaust holes and a valve port, the three filling ports and the two exhaust holes are all arranged at the top of the steel sleeve, the two filling ports are respectively close to the left end and the right end of the steel sleeve, the other filling port is positioned in the middle of the steel sleeve, and the two exhaust holes are respectively positioned in the middle of the two adjacent filling ports; the valve opening is arranged at the bottom of the steel sleeve and is positioned in the middle of the steel sleeve, and an annular cavity is formed between the steel sleeve and the pipe body;
step 2: placing a rectangular steel wire mesh into the annular cavity, rolling the steel wire mesh into a cylinder shape, and then fixedly connecting the butted edges of the steel wire mesh together;
step 3: sealing the two ends of the annular cavity by a sealing material;
step 4: vacuumizing the annular cavity, then pouring epoxy resin into the annular cavity from the top, and closing the feed valve when all exhaust holes of the steel sleeve are filled with epoxy resin;
step 5: opening a valve opening at the bottom of the steel sleeve to enable epoxy resin in the steel sleeve to flow out from the valve opening, and closing the valve opening when the epoxy resin cannot flow out continuously;
step 6: repeating Step4 and Step5 for multiple times, and repeatedly flushing the inner wall of the steel sleeve and the outer wall of the pipe body by using epoxy resin;
step 7: and (3) filling epoxy resin into the annular cavity, closing the feed valve when epoxy resin overflows from all exhaust holes of the steel sleeve, and finally standing to form the epoxy resin.
2. The method of repairing a pipe using a steel epoxy sleeve as claimed in claim 1, wherein the diameter of the steel wire mesh after being rolled into a cylindrical shape at Step2 is 4-8mm larger than the outer diameter of the pipe body.
3. The method of repairing a pipe with a steel epoxy sleeve as claimed in claim 1 wherein the annular cavity is left to stand for 24 hours after sealing at both ends in Step 3.
4. The method of repairing a pipe using a steel epoxy sleeve as claimed in claim 1 wherein the annular cavity is evacuated to-0.8 MPa in Step 4.
5. The method of repairing a pipe using a steel epoxy sleeve as claimed in claim 1, wherein the number of times of repeating steps 4 and Step5 in Step6 is 3-5 times.
6. The method of rehabilitating a pipe with a steel epoxy sleeve as in claim 1, wherein the standing time at Step7 is 24 hours.
7. The method of repairing a pipe with a steel epoxy sleeve as claimed in claim 1, wherein the operating environment is at room temperature and the epoxy resin is at a temperature of 30-35 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910315110.XA CN110005905B (en) | 2019-04-18 | 2019-04-18 | Method for repairing pipeline by using steel epoxy sleeve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910315110.XA CN110005905B (en) | 2019-04-18 | 2019-04-18 | Method for repairing pipeline by using steel epoxy sleeve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110005905A CN110005905A (en) | 2019-07-12 |
| CN110005905B true CN110005905B (en) | 2020-08-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910315110.XA Expired - Fee Related CN110005905B (en) | 2019-04-18 | 2019-04-18 | Method for repairing pipeline by using steel epoxy sleeve |
Country Status (1)
| Country | Link |
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| CN (1) | CN110005905B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110701425B (en) * | 2019-09-12 | 2022-06-10 | 上海井园市政工程有限公司 | Non-excavation type pipeline repairing method |
| CN110672151B (en) * | 2019-09-23 | 2022-07-05 | 中国石油天然气集团有限公司 | Evaluation method for pipeline repairing effect by using epoxy steel sleeve |
| CN112178363A (en) * | 2020-09-18 | 2021-01-05 | 中国海洋石油集团有限公司 | Online repair device and repair method for cold insulation material of LNG pipeline |
| CN112976001A (en) * | 2021-02-25 | 2021-06-18 | 中国计量大学 | Piping lane inspection robot |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1254723B (en) * | 1992-03-18 | 1995-10-09 | Snam Spa | PROCEDURE FINALIZED FOR THE INTERVENTIONS OF REPAIR OF DAMAGES LOCATED TO THE CONDUCT THROUGH THE APPLICATION OF ARMOR WITH AN INTERPOSED PROTECTIVE SHEATH |
| WO2005114036A1 (en) * | 2004-04-29 | 2005-12-01 | Jorge Jose Schuhwerk | Assembly for repairing a subsea pipeline and method |
| US7165579B2 (en) * | 2004-09-29 | 2007-01-23 | Dresser, Inc. | Pipeline repair system and method of installation |
| US8141592B2 (en) * | 2004-12-03 | 2012-03-27 | Illinois Tool Works Inc. | System and method for pipe repair |
| CN109000083A (en) * | 2017-06-07 | 2018-12-14 | 中国石油天然气股份有限公司 | A kind of method of epoxy sleeve pipe-repairing |
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- 2019-04-18 CN CN201910315110.XA patent/CN110005905B/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN110005905A (en) | 2019-07-12 |
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Granted publication date: 20200818 |
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