RTP composite pipeline butt joint method
By cutting off the outer cladding and reinforcement layer at the end of the composite pipe, welding with flange connecting barrels and electrofusion sleeves, and using fixed plugs and elastic footrests to achieve removable docking, the problem of RTP composite pipes being unable to be split and re-docked, and reliable docking and disassembly re-connection are achieved.
Patent Information
- Application Number
- CN202510450334.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-11
- Publication Date
- 2025-07-08
AI Technical Summary
The problem that existing RTP composite pipelines cannot be split and cannot be connected again after welding.
The outer cover and reinforcement layer of the end of the composite pipe are cut off, and the flange connecting cylinder and the electrofusion sleeve are used for welding, and the removable butt is achieved through fixed plugs and elastic footrests, and the electrofusion welding is used for the nickel-chromium alloy electric fuse.
It realizes an RTP composite pipeline connection method that is convenient and reliable to connect and can be re-docked after splitting, avoiding the inconvenience of welding method.
Smart Images
Figure CN120274138A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of composite pipelines, and particularly to a method for butt - jointing RTP composite pipelines. Background Art
[0002] RTP composite pipeline is the abbreviation of fiber - reinforced thermoplastic composite pipeline. The RTP composite pipeline from the inside to the outside is successively an inner lining layer, a reinforcing layer, and an outer covering layer. The inner lining layer and the outer covering layer use high - density polyethylene, and the reinforcing layer adopts glass fiber - reinforced prepreg tape. Two composite pipelines are usually butt - jointed by fusion welding. The two composite pipelines butt - jointed by fusion welding cannot be disassembled and separated without damaging the pipeline, and cannot be butt - jointed again after separation. Summary of the Invention
[0003] The technical problem to be solved by the present invention is to provide a method for butt - jointing RTP composite pipelines that is convenient and reliable for butt - jointing, convenient for disassembly after butt - jointing, and can be easily re - butt - jointed after disassembly.
[0004] To solve the above problems, the technical solution adopted by the present invention is: A method for butt - jointing RTP composite pipelines, characterized in that the method is as follows: (1) Cut off the outer covering layer and the reinforcing layer with a length of 5 - 10 cm at the ends of the two composite pipelines to be butt - jointed, and only leave the inner lining layer. The cutting lengths of the outer covering layer and the reinforcing layer are equal; (2) Prepare a first flange connection tube, a second flange connection tube, and two electric fusion sleeves. The structures of the first flange connection tube and the second flange connection tube include: a coaxial flange plate and a plug-in tube. The inner end of the plug-in tube is fixedly connected to the inner circle of the flange plate. A circle of steps is provided on the outer wall of the plug-in tube. A guide slope is provided on the outer end of the plug-in tube to facilitate the insertion of the plug-in tube into the port of the composite pipe. A sealing groove is provided on the outer end surface of the flange plate; a plurality of bolt holes arranged along the circumference of the flange plate are provided on the flange plate of the first flange connection tube, and a fixed plug corresponding to each bolt hole is provided on the flange plate of the second flange connection tube; the structure of the fixed plug includes: a cylindrical shell, the rear end of the cylindrical shell is fixed to the flange plate, a movable rod capable of moving forward and backward is provided in the cylindrical shell, an articulated frame is provided on the movable rod, and rearwardly inclined foot supports are respectively hinged around the articulated frame, the inner end of each foot support is hinged to the articulated frame, and the outer end of each foot support is respectively passed through a through groove provided on the cylindrical shell. A cylindrical shell is extended out, and elastic rubber blocks are respectively arranged between each foot support and the moving rod, and limit blocks for limiting the outward swinging angle of each foot support are also respectively arranged on the articulated frame. Under the limit of each limit block, the maximum outward swinging angle of each foot support does not exceed 60 degrees, and the elastic rubber block padded the foot support until the foot support swings outward to abut against the limit block. After the foot support is pressed to overcome the elastic force of the elastic rubber block, it can swing inward and be retracted in the cylindrical shell. The two ends of the moving rod extend out of the front and rear ends of the cylindrical shell respectively, and the rear end of the moving rod also passes through the flange where it is located, and a spring seat located in the cylindrical shell is arranged at the front part of the moving rod, and a spring sleeved on the moving rod is arranged between the spring seat and the front end of the cylindrical shell, and the two ends of the spring are respectively abutted against the spring seat and the front end of the cylindrical shell, and a limit hole is arranged on the moving rod, and a limit rod that can be inserted into the limit hole is pluggable and arranged on the cylindrical shell. After the limit rod is inserted into the limit hole, the moving rod can be limited; (3) Insert the plug-in tube of the first flange connection tube into the port to be connected to a composite pipe until the step on the plug-in tube abuts against the port of the composite pipe, and the plug-in tube and the composite pipe are interference fit. At this time, the top surface of the step is flush with the outer side surface of the lining layer of the composite pipe, and the bottom surface of the step is in close contact with the inner side surface of the lining layer of the composite pipe. Heat and weld the abutting joint between the step and the port of the composite pipe, and then spirally wrap the electric fuse around the outer side of the lining layer at the plug-in tube and the port of the composite pipe. Then, an electric fusion sleeve is wrapped around the outer hoop of the lining layer at the plug-in tube and the port of the composite pipe, and then a voltage is applied to both ends of the electric fuse to heat the electric fuse, so that the electric fusion sleeve, the plug-in tube of the first flange connection tube, and the lining layer at the port of the composite pipe can be melted and bonded together, so that the first flange connection tube can be electric fusion welded to the port to be connected to a composite pipe; (4)Insert the insertion pipe of the second flange connecting cylinder into the port to be docked of another composite pipe until the step on the insertion pipe abuts against the port of the composite pipe. The insertion pipe and the composite pipe are in interference fit. At this time, the top surface of the step is flush with the outer side of the inner lining layer of the composite pipe, and the bottom surface of the step is closely attached to the inner side of the inner lining layer of the composite pipe. Heat-weld the abutting joint of the step and the port of the composite pipe, then helically wind the electrofusion wire around the outer side of the inner lining layer at the port of the insertion pipe and the composite pipe. Then, slip an electrofusion sleeve over the outer side of the inner lining layer at the port of the insertion pipe and the composite pipe. Then, apply voltage to both ends of the electrofusion wire to make the electrofusion wire heat up, so that the electrofusion sleeve, the insertion pipe of the second flange connecting cylinder, and the inner lining layer at the port of the composite pipe can be melted and bonded together, so that the second flange connecting cylinder can be electrofusion welded to the port to be docked of another composite pipe; (5)Two composite pipes are docked through two flange connecting cylinders. When docking, the flange plates on the two flange connecting cylinders approach each other front and back. A sealing ring is placed between the sealing grooves of the two flange plates for sealing. Each fixed bolt and the corresponding bolt hole face each other front and back. Then, the worker presses the rear end of the moving rod against the spring force, so that the moving rod drives each footrest to move forward through the bolt hole. When each footrest passes through the bolt hole, the bolt hole will press each footrest inward. After passing through the bolt hole, each footrest resets and expands under the action of its respective elastic rubber block. Then, each footrest can abut against the flange plate where the bolt hole is located under the action of the spring, so that the two flange plates can be closely abutted. Then, insert the limiting rod on each fixed bolt into the limiting hole. At this time, the two flange plates can be locked by the cooperation of each fixed bolt and its corresponding bolt hole. When the two composite pipes need to be separated, pull out each limiting rod, and then the worker continues to press the rear end of each moving rod, so that the moving rod drives the footrests to continue to move forward. At this time, the side wall of the cylindrical shell can press the footrests, so that the footrests can be retracted into the cylindrical shell as the moving rod moves forward. At this time, each fixed bolt can withdraw from its corresponding bolt hole, and the two flange plates can be separated. After the worker presses the front end of the moving rod to move the moving rod backward, each footrest can leave the cylindrical shell and expand again, so that the fixed bolt can be used continuously.
[0005] Further, in the above-mentioned RTP composite pipe docking method, wherein: the electrofusion wire is a nickel-chromium alloy electrofusion wire, the material is Cr20Ni80, and the diameter of the electrofusion wire is 0.8 - 1.5 mm.
[0006] Further, in the above-mentioned RTP composite pipe docking method, wherein: in step (1), cut off 8 cm of the outer layer and the reinforcing layer at the ends of the two composite pipes to be docked.
[0007] Further, in the above-mentioned RTP composite pipe docking method, wherein: apply voltage to both ends of the electrofusion wire through an electrofusion welding machine.
[0008] Further, in the aforementioned RTP composite pipe docking method, each fixing bolt is provided with four footrests, and the four footrests are evenly arranged around the hinge frame.
[0009] The advantages of the present invention are as follows: compared with the fusion welding method, the RTP composite pipe docking method is convenient and reliable for docking, can be easily disassembled without damaging the pipe after docking, and can be easily re-docked after disassembly. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is a schematic structural diagram after docking of two RTP composite pipes.
[0011] Figure 2 It is a schematic structural diagram of the cooperation between the fixing bolt and the bolt hole. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0012] The present invention will be further described in detail below in conjunction with specific embodiments and the accompanying drawings.
[0013] As Figure 1 shown, the RTP composite pipe docking method is as follows: (1) Cut off the outer covering layer 1 and the reinforcing layer 2 with a length of 8 cm at the ends of the two composite pipes 24 to be docked, and only leave the inner lining layer 3. The cutting lengths of the outer covering layer 1 and the reinforcing layer 2 are equal; (2) Prepare a first flange connecting cylinder 4, a second flange connecting cylinder 5, and two electrofusion sleeves 6. The structures of the first flange connecting cylinder 4 and the second flange connecting cylinder 5 both include: coaxial flange plates 7 and inserting pipes 8. The inner end of the inserting pipe 8 is fixedly connected to the inner ring of the flange plate 7. A ring of steps 9 is provided on the outer side wall of the inserting pipe 8, and a guiding slope surface 10 is provided at the outer end of the inserting pipe 8 to facilitate the insertion of the inserting pipe 8 into the port of the composite pipe 24. A sealing groove 11 is provided on the outer end surface of the flange plate 7. A plurality of bolt holes 12 arranged along the circumferential direction of the flange plate are provided on the flange plate 7 of the first flange connecting cylinder 4, and fixing bolts 13 corresponding to each bolt hole 12 one by one are provided on the flange plate 7 of the second flange connecting cylinder 5; As Figure 2As shown in the figure, the structure of the fixed bolt 13 includes: a cylindrical housing 14, the rear end of the cylindrical housing 14 is fixed to the flange 7. A movable rod 15 that can move back and forth is arranged in the cylindrical housing 14. An articulated frame 16 is arranged on the movable rod 15. A rearwardly inclined footrest 17 is respectively articulated around the articulated frame 16. Four footrests 17 are evenly arranged. The inner ends of the respective footrests 17 are articulated to the articulated frame 16. The outer ends of the respective footrests 17 respectively extend out of the cylindrical housing 14 through through grooves 18 provided on the cylindrical housing 14. Elastic rubber blocks 19 are respectively arranged between the respective footrests 17 and the movable rod 15. Limit stop blocks for restricting the outward swing angle of the respective footrests 17 are respectively arranged on the articulated frame 16. Under the limitation of the respective limit stop blocks, the maximum outward swing angle of each footrest 17 does not exceed 60 degrees. The elastic rubber block 19 pads up the footrest 17 until the footrest 17 swings outward to abut against the limit stop block. After the footrest 17 is pressed to overcome the elastic force of the elastic rubber block 19, it can swing inward and retract into the cylindrical housing 14. Both ends of the movable rod 15 respectively extend out of the front and rear ends of the cylindrical housing 14, and the rear end of the movable rod 15 also passes through the flange 7 where it is located. A spring seat 20 located in the cylindrical housing 14 is arranged at the front part of the movable rod 15. A spring 21 sleeved on the movable rod 15 is arranged between the spring seat 20 and the front end of the cylindrical housing 14. Both ends of the spring 21 respectively abut against the spring seat 20 and the front end of the cylindrical housing 14. A limit hole 22 is arranged on the movable rod 15. A limit rod 23 that can be inserted into the limit hole 22 is detachably arranged on the cylindrical housing 14. After the limit rod 23 is inserted into the limit hole 22, it can limit the movable rod 15; (3) Insert the insertion pipe 8 of the first flange connecting cylinder 4 into the to-be-docked port of a composite pipe 24 until the step 9 on the insertion pipe 8 abuts against the port of the composite pipe 24. The insertion pipe 8 and the composite pipe 24 are in interference fit. At this time, the top surface of the step 9 is flush with the outer side surface of the inner liner 3 of the composite pipe 24, and the bottom surface of the step 9 is in close contact with the inner side surface of the inner liner 3 of the composite pipe 24. Heat weld the abutting joint seam between the step 9 and the port of the composite pipe 24. Then, helically wind the electrofusion wire 25 around the outer side of the inner liner 3 at the port of the insertion pipe 8 and the composite pipe 24. Then, a electrofusion sleeve 6 is sleeved and covered on the outer side of the inner liner 3 at the port of the insertion pipe 8 and the composite pipe 24. A notch is provided on the electrofusion sleeve 6 so that the electrofusion sleeve 6 can be unfolded for covering. Then, voltage is applied to both ends of the electrofusion wire 25 to make the electrofusion wire 25 generate heat, so that the electrofusion sleeve 6, the insertion pipe 8 of the first flange connecting cylinder 4, and the inner liner 3 at the port of the composite pipe 24 can be melted and bonded together, so that the first flange connecting cylinder 4 can be electrofusion welded to the to-be-docked port of a composite pipe 24; (4)Insert the insertion pipe 8 of the second flange connecting tube 5 into the port to be butt-jointed of another composite pipe 24 until the step 9 on the insertion pipe 8 abuts against the port of the composite pipe 24. The insertion pipe 8 and the composite pipe 24 are in interference fit. At this time, the top surface of the step 9 is flush with the outer side of the inner lining layer 3 of the composite pipe 24, and the bottom surface of the step 9 is in close contact with the inner side of the inner lining layer 3 of the composite pipe 24. Heat-weld the abutting joint seam between the step 9 and the port of the composite pipe 24. Then, helically wind the electrofusion wire 25 around the outer side of the inner lining layer 3 at the port of the insertion pipe 8 and the composite pipe 24. Next, slip an electrofusion sleeve 6 over the outer side of the inner lining layer 3 at the port of the insertion pipe 8 and the composite pipe 24. Then, apply voltage to both ends of the electrofusion wire 25 to make the electrofusion wire 25 generate heat, so that the electrofusion sleeve 6, the insertion pipe 8 of the second flange connecting tube 5, and the inner lining layer 3 at the port of the composite pipe 24 can be melted and bonded together, so that the second flange connecting tube 5 can be electrofusion-welded to the port to be butt-jointed of another composite pipe 24; (5)The two composite pipes 24 are butt-jointed through two flange connecting tubes. When butt-jointing, the flange plates 7 on the two flange connecting tubes approach each other front and back. A sealing ring is placed between the sealing grooves 11 of the two flange plates 7 for sealing. Each fixing bolt 13 and the corresponding bolt hole 12 are opposite to each other front and back. Then, the worker presses the rear end of the moving rod 15 against the elastic force of the spring 21, so that the moving rod 15 drives each footrest 17 to move forward through the bolt hole 12. When each footrest 17 passes through the bolt hole 12, the bolt hole 12 will press each footrest 17 inward. After passing through the bolt hole 12, each footrest 17 resets and expands under the action of its respective elastic rubber block 19. Then, each footrest 17 can abut against the flange plate 7 where the bolt hole 12 is located under the action of the spring 21, so that the two flange plates 7 can be close to each other. Then, insert the limiting rod 23 on each fixing bolt 13 into the limiting hole 22. At this time, the two flange plates 7 can be locked by the cooperation of each fixing bolt 13 and the corresponding bolt hole 12. When the two composite pipes 24 need to be separated, pull out each limiting rod 23, and then the worker continues to press the rear end of each moving rod 15, so that the moving rod 15 drives the footrests 17 to continue to move forward. At this time, the side wall of the cylindrical shell 14 can press the footrests 17, so that the footrests 17 can be retracted into the cylindrical shell 14 as the moving rod 15 moves forward. At this time, each fixing bolt 13 can withdraw from the corresponding bolt hole 12 and the two flange plates 7 can be separated. When the worker presses the front end of the moving rod 15 to make the moving rod 15 move backward, each footrest 17 can leave the cylindrical shell 14 and reopen, so that the fixing bolt 13 can be used continuously.
[0014] In this embodiment, the electrofusion wire 25 is a nickel-chromium alloy electrofusion wire with a material of Cr20Ni80 and a diameter of 0.8 - 1.5 mm. A voltage is applied to both ends of the electrofusion wire 25 through an electrofusion welding machine, which is convenient for adjusting the applied voltage.
Claims
1. The butt joint method of the RTP composite pipeline, characterized in that: The method is as follows: (1) Cut off the outer covering layer and the reinforcing layer with a length of 5 - 10 cm at the ends of the two composite pipes to be butt - jointed, and only leave the inner lining layer. The cutting lengths of the outer covering layer and the reinforcing layer are equal; (2) Prepare the first flange connecting cylinder, the second flange connecting cylinder, and two electro - fusion sleeves. The structures of the first flange connecting cylinder and the second flange connecting cylinder both include: coaxially arranged flange plates and inserting pipes. The inner end of the inserting pipe is fixedly butt - jointed with the inner ring of the flange plate. A circle of steps is arranged on the outer side wall of the inserting pipe, and a guiding slope is arranged at the outer end of the inserting pipe to facilitate the insertion of the inserting pipe into the port of the composite pipe. A sealing groove is arranged on the outer end face of the flange plate; several bolt holes arranged along the circumferential direction of the flange plate are arranged on the flange plate of the first flange connecting cylinder, and fixed bolts corresponding to each bolt hole one by one are arranged on the flange plate of the second flange connecting cylinder; the structure of the fixed bolt includes: a cylindrical shell, the rear end of the cylindrical shell is fixed to the flange plate. A movable rod that can move back and forth is arranged in the cylindrical shell. A hinge frame is arranged on the movable rod. Rear - inclined foot supports are respectively hinged around the hinge frame. The inner ends of the foot supports are hinged to the hinge frame, and the outer ends of the foot supports respectively extend out of the cylindrical shell through through - grooves arranged on the cylindrical shell. Elastic rubber blocks are respectively arranged between each foot support and the movable rod. Limiting blocks for restricting the outward swing angle of each foot support are also respectively arranged on the hinge frame. Under the limitation of each limiting block, the maximum outward swing angle of each foot support does not exceed 60 degrees. The elastic rubber blocks pad up the foot supports until the foot supports swing outward to abut against the limiting blocks. After the foot supports are pressed to overcome the elastic force of the elastic rubber blocks, they can swing inward and be retracted into the cylindrical shell. Both ends of the movable rod respectively extend out of the front and rear ends of the cylindrical shell, and the rear end of the movable rod also passes through the flange plate where it is located. A spring seat located in the cylindrical shell is arranged at the front part of the movable rod. A spring sleeved on the movable rod is arranged between the spring seat and the front end of the cylindrical shell. Both ends of the spring respectively abut against the spring seat and the front end of the cylindrical shell. A limiting hole is arranged on the movable rod, and a limiting rod that can be inserted into the limiting hole is detachably arranged on the cylindrical shell. After the limiting rod is inserted into the limiting hole, it can limit the movable rod; (3) Insert the inserting pipe of the first flange connecting cylinder into the port to be butt - jointed of a composite pipe until the step on the inserting pipe abuts against the port of the composite pipe. The inserting pipe and the composite pipe are in interference fit. At this time, the top surface of the step is flush with the outer side surface of the inner lining layer of the composite pipe, and the bottom surface of the step is closely attached to the inner side surface of the inner lining layer of the composite pipe. Heat - weld the abutting joint seam between the step and the port of the composite pipe. Then, wind the electro - fusion wire spirally around the outer side of the inserting pipe and the inner lining layer at the port of the composite pipe. Then, a electro - fusion sleeve is sleeved and wrapped around the outer side of the inserting pipe and the inner lining layer at the port of the composite pipe. Then, apply voltage to both ends of the electro - fusion wire to make the electro - fusion wire heat up, so that the electro - fusion sleeve, the inserting pipe of the first flange connecting cylinder, and the inner lining layer at the port of the composite pipe can be melted and bonded together, so that the first flange connecting cylinder can be electro - fusion welded to the port to be butt - jointed of a composite pipe; (4) Insert the insertion pipe of the second flange connecting cylinder into the port to be butt-jointed of another composite pipe until the step on the insertion pipe abuts against the port of the composite pipe. The insertion pipe and the composite pipe are in interference fit. At this time, the top surface of the step is flush with the outer side of the inner lining layer of the composite pipe, and the bottom surface of the step is closely attached to the inner side of the inner lining layer of the composite pipe. Heat-weld the abutting joint seam between the step and the port of the composite pipe. Then, helically wind the electrofusion wire around the outer side of the inner lining layer at the port of the insertion pipe and the composite pipe. Next, sleeve and wrap an electrofusion sleeve on the outer side of the inner lining layer at the port of the insertion pipe and the composite pipe. Then, apply voltage to both ends of the electrofusion wire to make the electrofusion wire heat up, so that the electrofusion sleeve, the insertion pipe of the second flange connecting cylinder, and the inner lining layer at the port of the composite pipe can be melted and bonded together, so that the second flange connecting cylinder can be electrofusion-welded to the port to be butt-jointed of another composite pipe; (5) Two composite pipes are butt-jointed through two flange connecting cylinders. During butt-joint, the flange plates on the two flange connecting cylinders approach each other front and back. A sealing ring is placed between the sealing grooves of the two flange plates for sealing. Each fixing bolt is opposite to the corresponding bolt hole front and back. Then, the worker presses the rear end of the moving rod against the spring force, so that the moving rod drives each footrest to move forward through the bolt hole. When each footrest passes through the bolt hole, the bolt hole will press each footrest inward. After passing through the bolt hole, each footrest resets and expands under the action of its respective elastic rubber block. Then, each footrest can abut against the flange plate where the bolt hole is located under the action of the spring, so that the two flange plates can be closely attached. Then, insert the limiting rod on each fixing bolt into the limiting hole. At this time, the two flange plates can be locked by the cooperation of each fixing bolt and its corresponding bolt hole. When the two composite pipes need to be separated, pull out each limiting rod, and then the worker continues to press the rear end of each moving rod, so that the moving rod drives the footrests to continue to move forward. At this time, the side wall of the cylindrical shell can press the footrests, so that the footrests can be retracted into the cylindrical shell as the moving rod moves forward. At this time, each fixing bolt can withdraw from its corresponding bolt hole, so that the two flange plates can be separated. After the worker presses the front end of the moving rod to make the moving rod move backward, each footrest can leave the cylindrical shell and expand again, so that the fixing bolt can be used continuously.
2. The RTP composite pipe butt joint method according to claim 1, characterized in that: The electrofusion wire is a nickel-chromium alloy electrofusion wire, with the material of Cr20Ni80 and the diameter of the electrofusion wire being 0.8 - 1.5 mm.
3. The RTP composite pipe butt joint method according to claim 1 or 2, characterized in that: In step (1), cut off the outer layer and the reinforcing layer with a length of 8 cm at the ends of the two composite pipes to be butt-jointed.
4. The RTP composite pipe butt joint method according to claim 1 or 2, characterized in that: Apply voltage to both ends of the electrofusion wire through an electrofusion welding machine.
5. The RTP composite pipe butt joint method according to claim 1 or 2, characterized in that: Each fixing bolt is provided with four footrests, and the four footrests are evenly arranged around the hinge frame.