CN108561660B - Connection joint and method for fiber reinforced thermoplastic composite continuous pipe - Google Patents
Connection joint and method for fiber reinforced thermoplastic composite continuous pipe Download PDFInfo
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- CN108561660B CN108561660B CN201810387832.1A CN201810387832A CN108561660B CN 108561660 B CN108561660 B CN 108561660B CN 201810387832 A CN201810387832 A CN 201810387832A CN 108561660 B CN108561660 B CN 108561660B
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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
- F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
- F16L47/14—Flanged joints
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- Rigid Pipes And Flexible Pipes (AREA)
Abstract
A connection joint and method for fiber reinforced thermoplastic composite continuous pipe are realized by adopting the connection of convex joint and concave joint, the convex joint, the concave joint and the composite continuous pipe body are connected into a whole. The manufacturing process of the convex surface joint and the concave surface joint is synchronously and continuously carried out with the production process of the composite continuous pipe body, the concave surface joint at one end of one composite continuous pipe is connected with the convex surface joint at one end of the other composite continuous pipe through bolts, two sealing rings are arranged between the convex surface joint and the concave surface joint, after the two composite continuous pipes are connected, the parts contacted with internal conveying media are all inner liners, the inner liners are all anti-corrosion thermoplastic plastics, therefore, the connecting joint cannot reduce the anti-corrosion performance of the pipeline, the pipeline pipe diameters are consistent, the problem that the pipe diameters of mechanical buckling type metal joint parts are reduced is solved, the conveying efficiency is not influenced, the inside of the pipeline connected by adopting the method is all anti-corrosion thermoplastic plastics, the on-site connection is easy to realize, and the installation speed is high.
Description
Technical Field
The invention belongs to the field of nonmetallic composite pipes, and particularly relates to a connecting joint and a connecting method of a fiber reinforced thermoplastic composite continuous pipe.
Background
Nonmetallic pipelines have excellent corrosion resistance and become an important development direction of corrosion prevention of oil and gas field gathering and transportation pipelines. Nonmetallic pipelines for oil and gas fields have been developed from original glass fiber reinforced plastic pipes to nonmetallic composite pipes of various types, including coiled fiber reinforced thermoplastic composite continuous pipes, steel skeleton composite pipes, flexible composite pipes, plastic alloy composite pipes and the like. Nonmetallic composite coiled tubing generally employs a three-layer structure of an inner liner, a reinforcing layer, and an outer protective layer. The existing nonmetallic composite continuous pipe is mainly connected by adopting a mechanical buckling type metal joint, namely, firstly, the metal joint is inserted into an inner lining layer of the composite pipe body, and then, the metal joint is compounded with the nonmetallic pipe body by adopting an external buckling or internal expansion mode. For example, the utility model patent with CN 201925632U discloses a buckling type composite pressure pipe joint and a pipe connecting structure, which belong to the buckling type metal joint connecting mode. The whole nonmetal conveying pipeline connected by the buckling metal joint has a local metal channel, and the appearance of the local metal channel can bring four adverse factors. Firstly, the metal material is directly contacted with a conveyed medium, if the metal material is improperly selected, the metal material is corroded by the conveyed medium, so that the service time of the whole pipeline is affected, and the running risk is increased; secondly, because the metal joint is inserted into the nonmetal composite continuous pipe, the pipe diameter of a channel formed by the metal joint is smaller than that of the whole pipeline, and the conveying efficiency of the pipeline is affected; thirdly, the binding force between the buckled metal joint and the nonmetal pipe body is only provided by the friction force between the buckled metal joint and the nonmetal pipe body, the binding strength is limited and is greatly smaller than the tensile strength of the nonmetal pipe body, and the joint slip risk exists in the construction engineering; and fourthly, a nonmetallic composite pipeline for conveying high-pressure natural gas, wherein a gas medium slowly permeates into a structural layer of the composite pipe from an interface of the metal joint and the buckling of the inner liner of the composite pipe, so that the structural layer of the composite pipe is invalid.
Therefore, some novel connection modes are also provided in the prior art, for example, the invention patent with the Chinese patent publication number of CN 103267192A discloses a flexible composite pipe joint and a connection method thereof. The patent proposes to use thermoplastic plastic materials for manufacturing the joint, the joint is connected with the composite pipe body through ultrasonic welding, and the joint is connected with the joint through a flange. Experiments show that the joint and the connecting method thereof provided by the invention are only suitable for lower working pressure, because the joint has no structure similar to the reinforcing layer of the composite pipe body, and is only made of uniform plastic material, and the pressure bearing performance of the joint is greatly lower than that of the composite pipe body.
Disclosure of Invention
The invention aims at overcoming the defects in the prior art, and aims to provide a connecting joint and a connecting method for a fiber reinforced thermoplastic composite continuous pipe, which solve the adverse factors caused by the fact that a non-metal composite continuous pipe is connected by adopting a mechanical buckling type metal joint.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
The connecting joint of the fiber reinforced thermoplastic composite continuous pipe comprises a convex joint arranged at the end part of a first composite continuous pipe body and a concave joint arranged at the end part of a second composite continuous pipe body, wherein the convex joint is matched with the concave joint, and the convex joint comprises a convex metal inlay; the first composite continuous pipe body and the second composite continuous pipe body have the same structure, the first composite continuous pipe body comprises an inner liner, the outer side of the inner liner is wrapped with a reinforcing layer, and the outer side of the reinforcing layer is wrapped with an outer protective layer; the convex metal inner inlay is sleeved at the end part of the inner liner layer of the first composite continuous pipe body, and a composite material of fiber and thermosetting resin is arranged outside the convex metal inner inlay and the outer protective layer of the first composite continuous pipe body; the concave surface joint comprises a concave surface metal inner inlay matched with the convex surface metal inner inlay, the concave surface metal inner inlay is arranged at the end part of the inner liner layer of the second composite continuous pipe body, and the outer sides of the concave surface metal inner inlay and the outer protective layer of the second composite continuous pipe body are provided with composite materials of fibers and thermosetting resin.
The invention is further improved in that the convex metal inlay comprises a convex body, a convex shoulder is arranged at the end part of the convex body, and a plurality of annular protrusions are arranged on the outer wall of the convex body; the concave metal inlay comprises a concave body, a concave shoulder is arranged at the end part of the concave body, and the concave shoulder is matched with the convex shoulder.
The invention is further improved in that the number of the annular protrusions on the convex body and the number of the annular protrusions on the concave body are 3-5; annular protrusions on the convex body and the concave body are arranged at equal intervals, and the distance between two adjacent annular protrusions is 40-60 mm.
The invention is further improved in that a plurality of grooves for changing the winding direction and angle of the composite material are formed on the annular bulge which is farthest from the convex shoulder on the convex body; the annular convex edge furthest from the concave shoulder on the concave body is provided with a plurality of grooves for changing the winding direction and angle of the composite material.
The invention is further improved in that a plurality of screw holes are uniformly formed in the circumferential direction of the convex shoulder, a plurality of screw holes are uniformly formed in the circumferential direction of the concave shoulder, and the convex joint is connected with the concave joint through bolts penetrating through the screw holes on the concave shoulder and the convex body.
The invention is further improved in that a sealing ring is arranged between the convex shoulder and the concave shoulder.
The invention is further improved in that the winding angle of the composite material of the fiber and the thermosetting resin is 65-85 degrees, and the winding thickness is 8-50 mm.
The manufacturing process of the convex joint is synchronous and continuous with the production process of the composite continuous pipe body, after the convex metal inner inlay is installed on the end part of the inner liner of the first composite continuous pipe, the end part of the inner liner connected with the convex metal inner inlay is thickened and flanging, then the fiber continuous with the reinforcing layer and the thermosetting resin are compounded and then wound on the composite continuous pipe body and the convex metal inner inlay, so that the convex metal inner inlay is completely placed in the composite material of the fiber and the thermosetting resin, the manufacturing of the convex joint is completed after curing, and the reinforcing layer and the outer protection layer are sequentially wrapped on the inner liner;
The manufacturing process of the concave surface joint is synchronously and continuously carried out with the production process of the composite continuous pipe body, after the concave surface metal inner inlay is installed on the end part of the inner liner of the second composite continuous pipe, the end part of the inner liner connected with the concave surface metal inner inlay is thickened and flanging, then the fiber continuous with the reinforcing layer and thermosetting resin are compounded and then wound on the composite continuous pipe body and the concave surface metal inner inlay, so that the concave surface metal inner inlay is completely placed in the composite material of the fiber and the thermosetting resin, the manufacturing of the concave surface joint is completed after curing, and meanwhile, the reinforcing layer and the outer protective layer are sequentially wrapped on the inner liner; the male adapter is connected to the female adapter by bolts.
The invention is further improved in that the winding angle of the composite material of the fiber and the thermosetting resin is 65-85 DEG, and the winding thickness is 8-50 mm; the convex metal inlay is made of steel.
The invention is further improved in that the composite material of the fiber and the thermosetting resin is prepared by the following steps: impregnating fibers in a thermosetting resin; wherein the fiber is glass fiber, carbon fiber, basalt fiber, polyester fiber or aramid fiber; the thermosetting resin is epoxy resin, unsaturated polyester resin or vinyl ester resin.
Compared with the prior art, the invention has the following beneficial effects:
The invention realizes the connection of the fiber reinforced thermoplastic composite continuous pipe by arranging the convex surface joint and the concave surface joint matched with the convex surface joint, and the convex surface metal inlay is sleeved at the end part of the inner liner of the first composite continuous pipe body, the concave surface metal inlay is arranged at the end part of the inner liner of the second composite continuous pipe body, and the concave surface metal inlay is matched with the convex surface metal inlay.
Further, the male adapter is connected to the female adapter by bolts passing through the female shoulder and the male body, which is easy to install.
The invention provides a connection method of a coiled fiber reinforced thermoplastic composite continuous pipe, which is realized by adopting the connection of a convex surface joint and a concave surface joint, wherein the convex surface joint, the concave surface joint and the composite continuous pipe body are connected into a whole, so that the tensile strength of the joint after connection is not lower than that of the composite continuous pipe body, an annular bulge for increasing the interface area between the metal inlay and fiber and thermosetting resin is arranged on the metal inlay in the concave surface joint, the bonding strength of the metal inlay and the composite continuous pipe can be greatly increased, the problem that the similar mechanical buckling type joint is easy to deviate from is avoided, the concave surface joint at one end of the coiled fiber reinforced thermoplastic composite continuous pipe is connected with the convex surface joint at one end of the other coiled fiber reinforced thermoplastic composite continuous pipe through bolts, two sealing rings are arranged between the convex surface joint and the concave surface joint, after the connection of the two composite continuous pipes, the joint is contacted with an internal conveying medium is made of inner liner, the inner liner is made of thermoplastic plastics, the connecting joint can not reduce the performance of a pipeline, the pipeline is consistent, the problem that the mechanical buckling type metal joint part is reduced in diameter, the pipeline is not influenced, the pipeline connection efficiency is avoided, the internal pipeline is easy to deviate from the external corrosion resistance is easy, the pipeline is not only is exposed, the internal corrosion resistance is easy to the pipeline is exposed, the corrosion resistance is long, and the corrosion resistance is easy to the external corrosion resistance is prevented, and the corrosion is easy to the service life is protected, and the corrosion is resistant to the external environment.
Furthermore, the end part of the inner liner connected with the convex metal inner inlay is thickened and flanging, so that the tightness of the inner liner and the end surface of the convex joint can be improved. The end part of the inner liner connected with the concave metal inner inlay is thickened and flanging, so that the tightness of the end surfaces of the inner liner and the concave joint can be improved.
Drawings
FIG. 1 is a schematic longitudinal cross-sectional view of a composite coiled tubing with a convex joint;
FIG. 2 is a schematic longitudinal cross-sectional view of a composite coiled tubing with a female adapter;
FIG. 3 is a schematic illustration of a composite coiled tubing connection.
Wherein: 1. an inner liner layer; 2. a reinforcing layer; 3. a protective layer; 4. a convex metal inlay; 5. an annular protrusion; 6. a screw hole; 7. a concave metal inlay; 8. a first seal ring; 9. a bolt; 10. a second seal ring; 11. a convex body; 12. a convex shoulder; 13. a concave body; 14. a concave shoulder.
Detailed Description
The technical scheme of the invention is further described in detail through examples.
Referring to fig. 1,2 and 3, the connection joint of the coiled fiber reinforced thermoplastic composite continuous pipe provided by the invention comprises a convex joint arranged at the end of a first composite continuous pipe body and a concave joint arranged at the end of a second composite continuous pipe body, wherein the convex joint is matched with the concave joint, and the convex joint comprises a convex metal inner inlay 4; the first composite continuous pipe body and the second composite continuous pipe body have the same structure, the first composite continuous pipe body comprises an inner liner 1, the outer side of the inner liner 1 is wrapped with a reinforcing layer 2, and the outer side of the reinforcing layer 2 is wrapped with an outer protective layer 3; the convex metal inlay 4 is sleeved at the end part of the inner liner 1 of the first composite continuous pipe body, and composite materials of fibers and thermosetting resin are arranged outside the convex metal inlay 4 and the outer protective layer 3 of the first composite continuous pipe body; the convex metal inlay 4 comprises a convex body 11, a convex shoulder 12 is arranged at the end part of the convex body 11, and 3-5 annular bulges 5 are arranged on the outer wall of the convex body 11;
The concave surface joint comprises a concave surface metal inner inlay 7 matched with the convex surface metal inner inlay 4, the concave surface metal inner inlay 7 is arranged at the end part of the inner liner 1 of the second composite continuous pipe body, and the outer sides of the concave surface metal inner inlay 7 and the outer protective layer 3 of the second composite continuous pipe body are provided with composite materials of fibers and thermosetting resin. The concave metal inlay 7 comprises a concave body 13, the end of the concave body 13 is provided with a concave shoulder 14, and the concave shoulder 14 is matched with the convex shoulder 12.
The number of the annular protrusions 5 on the convex body 11 and the number of the annular protrusions 5 on the concave body 13 are 3-5; the annular protrusions 5 on the convex body 11 and the concave body 13 are arranged at equal intervals, and the distance between two adjacent annular protrusions 5 is 40-60 mm. The annular bulge 5 on the outer wall of the convex body 11 has the function of enhancing the bonding strength of the convex metal inlay 4 and the composite continuous pipe body. The annular bulge 5 on the outer wall of the concave body has the function of enhancing the bonding strength of the concave metal inlay 7 and the composite continuous pipe body.
The annular bulge furthest from the convex shoulder 12 on the convex body 11 is provided with 4 grooves for changing the winding direction and angle of the composite material; the annular convex edge of the concave body 13 farthest from the concave shoulder 14 is provided with 4 grooves for changing the winding direction and angle of the composite material.
A plurality of screw holes 6 are uniformly formed in the circumferential direction of the convex shoulder 12, 8 screw holes 6 are uniformly formed in the circumferential direction of the concave shoulder 14, and the convex joint is connected with the concave joint through bolts penetrating through the screw holes 6 on the concave shoulder 14 and the convex body 11.
A sealing ring is provided between the convex shoulder 12 and the concave shoulder 14.
The winding angle of the fiber and the thermosetting resin composite material is 65-85 degrees, and the winding thickness is 8-50 mm.
The connection method of the connection joint specifically comprises the following steps:
the manufacturing process of the convex joint is synchronously and continuously carried out with the production process of the composite continuous pipe body, after the convex metal inner inlay 4 is installed on the end part of the inner liner 1 of the first composite continuous pipe body, the end part of the inner liner 1 connected with the convex metal inner inlay 4 is thickened and flanging, then a certain thickness is wound on the first composite continuous pipe and the convex metal inner inlay 4 by a certain angle after being compounded by fibers continuous with the reinforcing layer 2 and thermosetting resin, the convex metal inner inlay 4 is completely placed in a composite material of the fibers and the thermosetting resin, the manufacturing of the convex joint is completed after curing, and meanwhile, the reinforcing layer 2 and the outer protective layer 3 are sequentially wrapped on the inner liner 1;
The manufacturing process of the concave adapter is the same as that of the convex adapter, and the convex metal inlay 4 is replaced by the concave metal inlay 7. The method comprises the following steps: the manufacturing process of the concave joint is synchronously and continuously carried out with the production process of the composite continuous pipe body, after the concave metal inner inlay 7 is installed on the end part of the inner liner 1 of the second composite continuous pipe, thickening and flanging are carried out on the end part of the inner liner 1 connected with the concave metal inner inlay 7, then the fiber continuous with the reinforcing layer 2 and thermosetting resin are adopted for compounding (the fiber and thermosetting resin are compounded to be a composite material of the fiber and the thermosetting resin after the fiber is impregnated with the thermosetting resin), and then a certain thickness is wound on the second composite continuous pipe body and the concave metal inner inlay 7 by a certain angle, so that the concave metal inner inlay 7 is completely placed in the composite material of the fiber and the thermosetting resin, the manufacturing of the concave joint is completed after curing, and meanwhile, the reinforcing layer 2 and the outer protection layer 3 are sequentially wrapped on the inner liner 1; the male adapter is connected to the female adapter by bolts.
The composite material of the fiber and the thermosetting resin is wound on the convex metal inner inlay 4 and the outer protective layer 3, the winding angle of the composite material of the fiber and the thermosetting resin is 65-85 degrees, and the winding thickness is 8-50 mm.
The convex metal inlay 4 is made of steel, preferably martensitic stainless steel.
The fiber material of the composite material of the fiber and the thermosetting resin and the fiber material of the reinforcing layer of the composite continuous pipe body are the same fiber which is continuous and uninterrupted.
The composite material of the fiber and the thermosetting resin is prepared by the following steps: the fiber is impregnated in thermosetting resin. Wherein, the fiber is inorganic or organic fiber, and glass fiber, carbon fiber, basalt fiber, polyester fiber or aramid fiber are preferably selected; the thermosetting resin is preferably epoxy resin, unsaturated polyester resin or vinyl ester resin.
According to the invention, the end part of the inner liner 1 connected with the convex metal inlay 4 is subjected to thickening flanging treatment, so that the tightness between the inner liner and the end surface of the convex joint can be improved.
The end part of the inner liner 1 connected with the concave metal inner inlay 7 is subjected to thickening flanging treatment, so that the tightness of the end surfaces of the inner liner and the concave joint can be improved.
The male adapter is connected with the female adapter by bolts passing through the female shoulder 14 and the screw holes 6 in the male body 11, and when the male adapter is connected, a first sealing ring 8 is arranged between the convex surface of the male shoulder 12 and the concave surface of the female shoulder 14, and a second sealing ring 10 is arranged between the male shoulder 12 and the female shoulder 14.
The concave metal inlay 7 is made of the same material as the convex metal inlay 4. After the convex surface joint of one coiled fiber reinforced thermoplastic plastic composite continuous pipe is connected with the concave surface joint of the other coiled fiber reinforced thermoplastic plastic composite continuous pipe, the connection between the coiled fiber reinforced thermoplastic plastic composite continuous pipes can be realized. The convex surface connector size can be matched with the concave surface connector size, so that the sealing effect is achieved.
Example 1: connecting method of DN80mm PN26MPa coiled glass fiber reinforced high-density polyethylene composite continuous pipe
The composite continuous pipe lining layer 1 is made of high-density polyethylene, the reinforcing layer 2 is made of glass fiber wound on the lining layer 1, and the outer protective layer 3 is made of polyethylene coated on the reinforcing layer 2. The convex joint is composed of an inner liner 1 of the composite continuous pipe, a convex metal inner inlay 4 and a composite material of glass fiber and thermosetting resin. The inner liner 1 is made of high-density polyethylene, the material of the convex metal inner inlay 4 is 1Cr13 martensitic stainless steel, three annular protrusions which are uniformly distributed are processed on the 1Cr13 martensitic stainless steel convex metal inner inlay, the manufacturing process of the convex joint is synchronous and continuous with the production (winding) process of the composite continuous pipe body, after the 1Cr13 martensitic stainless steel convex metal inner inlay is installed at the end part of the high-density polyethylene inner liner 1 of the composite continuous pipe body, thickening flanging treatment is carried out on the end part of the high-density polyethylene inner liner 1 connected with the convex metal inner inlay, and a glass fiber and epoxy resin composite material is wound on the installed 1Cr13 martensitic stainless steel convex metal inner inlay and the pipe body reinforcing layer 2, wherein the epoxy resin comprises 6207 epoxy 100 parts, 647 anhydride 138 parts, 1.5 parts of dimethylaniline, 8 parts of liquid butyronitrile and 8 parts of acetone according to parts by mass, the winding angle is 75 degrees, and the manufacturing is completed after the winding is completed, the high-density polyethylene inner liner 1 is solidified for 12 hours at 85 ℃; the manufacturing process of the concave surface joint is the same as that of the convex surface joint.
The convex surface joint of one composite continuous pipe is fastened and connected with the concave surface joint of the continuous pipe of the convex surface joint of the other composite continuous pipe through bolts 9, and a sealing ring is added during connection to realize the connection of the whole pipeline. Verification tests were performed after connection, and the test contents include a long-term hydrostatic test and a gas seal test. The pressure value of the long-term hydrostatic pressure is 39MPa, and the pressure is maintained for 24 hours, so that the pipe body and the joint are not leaked. The gas pressure value of the gas seal test is 33MPa, the pressure is maintained for 8 hours, and the joint of the pipe body and the joint is not leaked.
Claims (6)
1. The connecting joint of the fiber reinforced thermoplastic composite continuous pipe is characterized by comprising a convex joint arranged at the end part of a first composite continuous pipe body and a concave joint arranged at the end part of a second composite continuous pipe body, wherein the convex joint is matched with the concave joint, and the convex joint comprises a convex metal inlay (4); the first composite continuous pipe body and the second composite continuous pipe body have the same structure, the first composite continuous pipe body comprises an inner liner (1), the outer side of the inner liner (1) is wrapped with a reinforcing layer (2), and the outer side of the reinforcing layer (2) is wrapped with an outer protective layer (3); the convex metal inlay (4) is sleeved at the end part of the inner liner (1) of the first composite continuous pipe body, and a composite material of fiber and thermosetting resin is arranged outside the convex metal inlay (4) and the outer protective layer (3) of the first composite continuous pipe body; the concave surface joint comprises a concave surface metal inlay (7) matched with the convex surface metal inlay (4), the concave surface metal inlay (7) is arranged at the end part of the inner liner (1) of the second composite continuous pipe body, and the outer sides of the concave surface metal inlay (7) and the outer protective layer (3) of the second composite continuous pipe body are provided with composite materials of fiber and thermosetting resin;
the convex metal inlay (4) comprises a convex body (11), a convex shoulder (12) is arranged at the end part of the convex body (11), and a plurality of annular bulges (5) are arranged on the outer wall of the convex body (11); the concave metal inlay (7) comprises a concave body (13), a concave shoulder (14) is arranged at the end part of the concave body (13), and the concave shoulder (14) is matched with the convex shoulder (12);
The number of the annular protrusions (5) on the convex body (11) and the number of the annular protrusions (5) on the concave body (13) are 3-5; annular protrusions (5) on the convex body (11) and the concave body (13) are arranged at equal intervals, and the distance between two adjacent annular protrusions (5) is 40-60 mm;
The annular bulge furthest from the convex shoulder (12) on the convex body (11) is provided with a plurality of grooves for changing the winding direction and angle of the composite material; the annular convex edge of the concave body (13) farthest from the concave shoulder (14) is provided with a plurality of grooves for changing the winding direction and angle of the composite material;
A plurality of screw holes (6) are uniformly formed in the circumferential direction of the convex shoulder (12), a plurality of screw holes (6) are uniformly formed in the circumferential direction of the concave shoulder (14), and the convex connector is connected with the concave connector through bolts penetrating through the screw holes (6) in the concave shoulder (14) and the convex body (11).
2.A connector for a fibre reinforced thermoplastic composite continuous tube according to claim 1, characterised in that a sealing ring is arranged between the convex shoulder (12) and the concave shoulder (14).
3. The connector of a fiber reinforced thermoplastic composite continuous pipe according to claim 1, wherein the composite material of the fiber and the thermosetting resin is wound at an angle of 65-85 degrees and a thickness of 8-50 mm.
4. A method for connecting a joint according to claim 1, characterized in that the manufacturing process of the convex joint is carried out synchronously and continuously with the production process of the composite continuous pipe body, after the convex metal inlay (4) is installed on the end part of the inner liner (1) of the first composite continuous pipe, thickening and flanging the end part of the inner liner (1) connected with the convex metal inlay (4), then adopting fiber and thermosetting resin continuous with the reinforcing layer (2) to be compounded and then winding on the composite continuous pipe body and the convex metal inlay (4), so that the convex metal inlay (4) is completely placed in the composite material of the fiber and the thermosetting resin, and the manufacturing of the convex joint is completed after curing, and simultaneously, the reinforcing layer (2) and the outer protective layer (3) are sequentially wrapped on the inner liner (1);
The manufacturing process of the concave surface joint is synchronously and continuously carried out with the production process of the composite continuous pipe body, after the concave surface metal inner inlay (7) is installed on the end part of the inner liner (1) of the second composite continuous pipe, the end part of the inner liner (1) connected with the concave surface metal inner inlay (7) is thickened and flanging, then the fiber continuous with the reinforcing layer (2) and the thermosetting resin are compounded and then wound on the composite continuous pipe body and the concave surface metal inner inlay (7), so that the concave surface metal inner inlay (7) is completely placed in the composite material of the fiber and the thermosetting resin, the manufacturing of the concave surface joint is completed after curing, and meanwhile, the reinforcing layer (2) and the outer protection layer (3) are sequentially wrapped on the inner liner (1); the male adapter is connected to the female adapter by bolts.
5. The connection method according to claim 4, wherein the angle of winding the composite material of the fiber and the thermosetting resin is 65-85 degrees, and the thickness of winding is 8-50 mm; the convex metal inlay (4) is made of steel.
6. The method of joining according to claim 4, wherein the composite of fibers and thermosetting resin is prepared by: impregnating fibers in a thermosetting resin; wherein the fiber is glass fiber, carbon fiber, basalt fiber, polyester fiber or aramid fiber; the thermosetting resin is epoxy resin, unsaturated polyester resin or vinyl ester resin.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810387832.1A CN108561660B (en) | 2018-04-26 | 2018-04-26 | Connection joint and method for fiber reinforced thermoplastic composite continuous pipe |
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| CN201810387832.1A CN108561660B (en) | 2018-04-26 | 2018-04-26 | Connection joint and method for fiber reinforced thermoplastic composite continuous pipe |
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| CN108561660B true CN108561660B (en) | 2024-05-28 |
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| CN109442126A (en) * | 2018-11-16 | 2019-03-08 | 中国石油天然气集团有限公司 | A kind of non-metal composite pipe jointing and manufacturing method |
| CN115992914A (en) * | 2021-10-19 | 2023-04-21 | 中国石油化工股份有限公司 | Flexible composite pipeline joint structure and preparation method thereof |
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| CN201159350Y (en) * | 2008-02-21 | 2008-12-03 | 赵树辉 | Bi-metal pipe fitting for steel skeleton plastic composite pipe |
| CN102287589A (en) * | 2010-06-17 | 2011-12-21 | 甘国工 | Steel plastic composite pipe for spirally-wound steel wire reinforcing body and pipe network |
| CN103470913A (en) * | 2013-07-05 | 2013-12-25 | 周立超 | Connecting structure and manufacturing and connecting method of metal glass steel FRP (Fiber-glass Reinforced Plastics) lining rubber and plastic subsea pipeline |
| JP2015068471A (en) * | 2013-09-30 | 2015-04-13 | 積水化学工業株式会社 | Pipe body joint structure and pipe body connection method |
| CN204164530U (en) * | 2014-10-09 | 2015-02-18 | 江苏申视新材料科技有限公司 | A kind of buckling-type pipe connector |
| CN107289221A (en) * | 2017-07-06 | 2017-10-24 | 中国石油天然气集团公司 | A kind of detachable non-metal composite pipe adapter assembly and its application method |
| CN208331536U (en) * | 2018-04-26 | 2019-01-04 | 中国石油天然气集团有限公司 | A kind of jointing of fiber reinforced thermoplastics composite coiled tubing |
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