Alignment method for jacket pipe

Abstract

The present invention provides a centering assembly for a jacketed pipe, further comprising an inner and outer pipe locking structure, and there are two inner and outer pipe locking structures; the outer pipe support is located between the two inner and outer pipe locking structures; the inner and outer pipe locking structure includes a mounting frame, and a positioning structure and a screw group mounted through the mounting frame; the positioning structure is arranged close to the outer pipe support and forms an outer pipe positioning space located in the installation channel; the screw group is arranged away from the outer pipe support and forms an inner pipe positioning space located in the installation channel; the screw group includes connecting screws, and the connecting screws are installed through the mounting frame and locked with the mounting frame through a first thread structure; there are at least three connecting screws and they are evenly spaced along the circumference of the mounting frame. It is beneficial to control the radial clearance between the smaller opening end of the pipe cap and the outer wall of the inner pipe, and it is also beneficial to control the relative parallelism between the inner pipe and the outer pipe, thereby ensuring the installation quality of the inner pipe and the outer pipe. A centering method for the jacketed pipe is also provided.

Description

Technical Field

[0001] The present invention belongs to the technical field of pipeline installation, and particularly relates to a centering method for jacket pipes. Background Art

[0002] A jacket pipe refers to a pipeline with a double-wall structure and is widely used in fields such as petrochemical industry. The jacket pipe includes an inner pipe and an outer pipe. The medium transported by the inner pipe is usually a process material, and a heat carrier or a cold carrier is passed through the circumferential gap between the outer pipe and the inner pipe to increase, decrease, or maintain the temperature of the process medium in the inner pipe. The heat carrier is usually steam, hot water, diphenyl, etc., and the cold carrier is usually chilled brine, etc. In order to make the medium flow evenly in the circumferential gap and the inner pipe wall be heated and cooled evenly, it should be ensured that the circumferential gap between the inner pipe and the outer pipe is uniform and eccentricity is avoided.

[0003] The jacket pipe includes a flanged jacket pipe, a cap-type jacket pipe, and an end-plate type jacket pipe. The cap-type jacket pipe, as a semi-jacket type jacket pipe, the inner pipes of two adjacent cap-type jacket pipes are welded together, and the weld is exposed. As Figure 1 shown, the cap-type jacket pipe includes an inner pipe 1 and an outer pipe 2 sleeved outside the inner pipe 1; both ends of the inner pipe 1 are located outside the outer pipe 2. The outer pipe 2 includes an outer pipe body 201 and a cap 202 connected to the outer pipe body 201. Caps 202 are provided at both ends of the outer pipe body 201, and the outer pipe body 201 is connected to the inner pipe 1 through the caps 202.

[0004] As Figure 2 shown, when connecting the inner pipe 1 and the outer pipe 2, the usual method is to pre-weld positioning blocks 4 on the outer wall of the inner pipe 1. There are three positioning blocks 4, and the three positioning blocks 4 are evenly spaced along the circumference of the inner pipe 1. The inner pipe 1 is passed through the outer pipe body 201 so that both ends of the inner pipe 1 are located outside the outer pipe body 201. The inner pipe 1 is passed through the cap 202 so that the end with a larger opening of the cap 202 is adjacent to the outer pipe body 201, and the end with a smaller opening of the cap 202 is far from the outer pipe body 201. By clamping a wedge-shaped gasket in the gap between the end with a smaller opening of the cap 202 and the outer wall of the inner pipe 1, the distance between the cap 202 and the outer wall of the inner pipe 1 is adjusted to be relatively uniform. After the adjustment is completed, the end with a larger opening of the cap 202 is welded to the end of the outer pipe body 201, and the end with a smaller opening of the cap 202 is welded to the outer wall of the inner pipe 1. Caps 202 are connected to both ends of the outer pipe body 201. The purpose of welding the positioning blocks 4 on the outer wall of the inner pipe 1 is to ensure the minimum width of the circumferential gap 3 between the inner pipe 1 and the outer pipe body 201. The purpose of clamping a wedge-shaped gasket in the gap between the end with a smaller opening of the cap 202 and the outer wall of the inner pipe 1 is to ensure that the circumferential gap between the end with a smaller opening of the cap 202 and the outer wall of the inner pipe 1 is relatively uniform. Furthermore, overall, the circumferential gap between the outer pipe 2 and the inner pipe 1 is ensured to be relatively uniform.

[0005] It should be noted that the material of the positioning block must be the same as that of the inner pipe. The installation position of the positioning block must be such that it does not affect the expansion and contraction of the inner pipe and can effectively support the outer pipe. It should also be avoided that the inner pipe wall is penetrated during the welding of the positioning block. If the size of the positioning block is not suitable, it will directly affect the flow rate and velocity of the heat carrier or cold carrier in the circumferential gap, and further affect the heat tracing efficiency. The welding quality of the positioning block will also directly affect the service life of the inner pipe. Therefore, there are relatively high construction requirements for the positioning block. Connecting the inner pipe and the outer pipe by the above construction method has the disadvantages of inconvenient operation, low work efficiency, low adjustment accuracy, and high construction requirements. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a centering method for a jacketed pipe, which can quickly realize the centering of the inner pipe and the outer pipe.

[0007] The technical solution adopted by the present invention to solve its technical problems is: a centering assembly for a jacketed pipe, including a support platform frame and an outer pipe support installed on the support platform frame;

[0008] It further includes an inner and outer pipe locking structure, and there are two of the inner and outer pipe locking structures;

[0009] Taking the plane rectangular coordinate system as the reference system, one of the inner and outer pipe locking structures, the outer pipe support, and the other inner and outer pipe locking structure are arranged in sequence along the x-axis direction;

[0010] The inner and outer pipe locking structure includes an installation frame, and a positioning structure and a screw rod group installed through the installation frame;

[0011] The installation frame has an installation channel for the outer pipe body to pass through;

[0012] The positioning structure is arranged close to the outer pipe support and forms an outer pipe positioning space in the installation channel;

[0013] The screw rod group is arranged away from the outer pipe support and forms an inner pipe positioning space in the installation channel; the screw rod group includes connecting screw rods, the connecting screw rods are installed through the installation frame and locked with the installation frame through a first thread structure; at least three connecting screw rods are provided and are evenly spaced along the circumference of the installation frame.

[0014] Further, the installation frame includes installation plates, multiple installation plates are connected end to end in sequence and enclose a frame structure; adjacent two installation plates are connected by a detachable connection structure;

[0015] The connecting screw rod is installed through the installation plate and locked with the installation plate through the first thread structure.

[0016] Further, the detachable connection structure includes connection studs disposed on the mounting plate, the connection studs passing through connection holes on an adjacent other mounting plate and being fastened by fastening nuts.

[0017] Further, the positioning structure includes positioning screws, the positioning screws being installed through the mounting frame and being locked with the mounting frame through second thread structures;

[0018] At least three positioning screws are provided and are evenly spaced along the circumferential direction of the mounting frame.

[0019] Further, the mounting frame is provided with mounting holes having a long hole structure, and the length direction of the mounting holes is parallel to the axial direction of the mounting frame;

[0020] The connection screw and the positioning screw are both installed through the mounting holes, the connection screw is locked with the mounting frame through a first locking nut, and the positioning screw is locked with the mounting frame through a second locking nut.

[0021] Further, the outer pipe support includes a V-shaped bracket with an upward opening, and the V-shaped bracket is connected to the support bench through a vertical adjustment structure;

[0022] A plurality of the outer pipe supports are arranged at intervals in the x-axis direction.

[0023] Further, the support bench is provided with through holes;

[0024] The vertical adjustment structure includes vertically arranged support screws, the support screws being installed through the through holes; the upper ends of the support screws are connected to the V-shaped bracket; the support screws are connected to the support bench through adjustment nuts;

[0025] A plurality of the support screws are provided, and the plurality of support screws are evenly spaced.

[0026] Further, an inner pipe hoop and an outer pipe hoop are further included, the inner pipe hoop and the outer pipe hoop are both located in the installation channel and are coaxially arranged with the mounting frame;

[0027] A first connection block is slidably installed on the inner pipe hoop, and the end of the connection screw located within the installation channel is connected to the first connection block;

[0028] A second connection block is slidably installed on the outer pipe hoop, and the end of the positioning screw located within the installation channel is connected to the second connection block.

[0029] Further, notches are provided at both axial ends of the mounting frame.

[0030] Method for centering of jacketed pipe, using a centering assembly for jacketed pipe, including the steps:

[0031] S1. Place the outer pipe body on the outer pipe support, pass the inner pipe through the outer pipe body so that both ends of the inner pipe are outside the outer pipe body; pass the inner pipe through the pipe cap, and arrange the end with the larger opening of the pipe cap adjacent to the outer pipe body; pipe caps are provided at both ends of the outer pipe body.

[0032] S2. Lift the inner pipe and weld the end with the larger opening of the pipe cap to the outer pipe body.

[0033] S3. Install the installation frame on the outer pipe body through the positioning structure.

[0034] S4. Adjust the connecting screw to make the gap between the end with the smaller opening of the pipe cap and the outer wall of the inner pipe uniform.

[0035] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention provides a centering assembly and method for jacketed pipe, which can quickly achieve the centering of the inner pipe and the outer pipe. It is beneficial to control the radial gap between the end with the smaller opening of the pipe cap and the outer wall of the inner pipe, and is also beneficial to control the relative parallelism between the inner pipe and the outer pipe, thereby ensuring the installation quality of the inner pipe and the outer pipe. It has the advantages of convenient operation, easy implementation, high efficiency, etc. Description of the Drawings

[0036] Figure 1 is a perspective view of a pipe-cap type jacketed pipe;

[0037] Figure 2 is a schematic diagram of the position of the positioning block in the background art;

[0038] Figure 3 is a perspective view of the present invention;

[0039] Figure 4 is the front view of the present invention;

[0040] Figure 5 is the side view of the present invention;

[0041] Figure 6 is the enlarged view of part A of the present invention;

[0042] Figure 7 is the enlarged view of part B of the present invention;

[0043] Reference numerals: 1 - inner tube; 2 - outer tube; 201 - outer tube body; 202 - tube cap; 3 - circumferential gap; 4 - positioning block; 5 - support stand; 501 - support platform; 502 - leg; 6 - outer tube support; 601 - V-shaped bracket; 602 - support screw; 7 - inner and outer tube locking structure; 8 - mounting plate; 801 - mounting hole; 802 - mounting channel; 9 - connecting screw; 10 - positioning screw; 11 - first locking nut; 12 - second locking nut; 13 - connecting stud; 14 - fastening nut; 15 - inner tube hose clamp; 16 - outer tube hose clamp; 17 - notch. Detailed implementation manners

[0044] The following will further describe the present invention in conjunction with Figure 3 , 4 , 5, 6, 7, and embodiments.

[0045] The centering assembly of the jacket pipe includes a support stand 5 and an outer tube support 6 mounted on the support stand 5; it further includes an inner and outer tube locking structure 7, and there are two inner and outer tube locking structures 7; taking the plane rectangular coordinate system as a reference system, one of the inner and outer tube locking structures 7, the outer tube support 6, and the other inner and outer tube locking structure 7 are arranged in sequence along the x-axis direction; the inner and outer tube locking structure 7 includes a mounting frame, and a positioning structure and a screw group mounted through the mounting frame; the mounting frame has a mounting channel 802 for the outer tube body 201 to pass through; the positioning structure is arranged close to the outer tube support 6 and forms an outer tube positioning space located in the mounting channel 802; the screw group is arranged away from the outer tube support 6 and forms an inner tube positioning space located in the mounting channel 802; the screw group includes a connecting screw 9, and the connecting screw 9 is mounted through the mounting frame and locked with the mounting frame through a first thread structure; the connecting screw 9 has at least three and is evenly spaced along the circumference of the mounting frame.

[0046] The support stand 5 has various structural forms. For example, the support stand 5 includes a support platform 501 and legs 502 evenly distributed below the support platform 501. The outer tube support 6 is installed on the support platform 501 and is located between two inner and outer tube locking structures 7. Place the outer tube body 201 on the outer tube support 6, and pass the inner tube 1 through the outer tube body 201 so that both ends of the inner tube 1 are outside the outer tube body 201. The installation frame provides connection support for the positioning structure and the connecting screw 9, and there is a spacing between the positioning structure and the screw group. Preferably, multiple groups of positioning structures are provided, and the multiple groups of positioning structures are arranged at intervals along the axial direction of the installation frame. Installation frames are respectively installed at both ends of the outer tube body 201, so that the end of the outer tube body 201 is located in the installation channel 802, and at the same time, the outer tube body 201 is located in the outer tube positioning space formed by the positioning structure. The positioning structure abuts against the outer tube body 201 to provide installation support for the installation frame. Pass the inner tube 1 through the pipe cap 202. The pipe cap 202 is located in the installation channel 802 and is between the positioning structure and the screw group. The end of the pipe cap 202 with a larger opening is arranged adjacent to the outer tube body 201, and the end of the pipe cap 202 with a smaller opening is away from the outer tube body 201. Pipe caps 202 are provided at both ends of the outer tube body 201. Lift the inner tube 1 manually, by a jacking device or a lifting mechanism. After the inner tube 1 is roughly aligned with the outer tube body 201, weld the end of the outer tube body 201 to the end of the pipe cap 202 with the larger opening. Preferably, four connecting screws 9 are provided. The connecting screw 9 is installed through the installation frame, and the end of the connecting screw 9 located inside the installation channel 802 abuts against the outer wall of the inner tube 1. The inner tube 1 is located in the inner tube positioning space formed by the screw group. Adjust the connecting screw 9 so that the end of the connecting screw 9 located inside the installation channel 802 abuts against the inner tube 1, making the gap between the end of the pipe cap 202 with the smaller opening and the outer wall of the inner tube 1 uniform, and then lock the connecting screw 9 to the installation frame through the first thread structure. The first thread structure can be a first threaded hole opened on the installation frame or a first locking nut 11. Thus, the alignment of the inner tube 1 and the outer tube 2 is achieved, and the circumferential gap between the inner tube 1 and the outer tube 2 is made uniform. Then weld the end of the pipe cap 202 with the smaller opening to the inner tube 1.

[0047] The installation frame can be an integrally formed integral structure, or the installation frame can be a hoop. Preferably, the installation frame includes installation plates 8. The multiple installation plates 8 are connected end to end in sequence and enclose a frame structure; adjacent two installation plates 8 are connected by a detachable connection structure; the connecting screw 9 is installed through the installation plate 8 and is locked to the installation plate 8 through the first thread structure. By setting the detachable connection structure, the disassembly and installation of the installation plates 8 are realized. The number of installation plates 8 can be adjusted according to the diameter of the outer tube body 201, and thus the size of the installation channel 802 can be adjusted. At least three installation plates 8 are provided, and preferably four installation plates 8 are provided.

[0048] The detachable connection structure can be a snap-fit structure. Preferably, the detachable connection structure includes a connecting stud 13 provided on the mounting plate 8. The connecting stud 13 passes through a connecting hole on an adjacent another mounting plate 8 and is fastened by a fastening nut 14. It has the advantages of stable connection, convenient disassembly and assembly, etc.

[0049] The positioning structure can be a positioning plate connected to the inner wall of the mounting frame, but it can only be applicable to the outer pipe body 201 with equal pipe diameters. In order to be applicable to the outer pipe body 201 with unequal pipe diameters. Preferably, the positioning structure includes a positioning screw 10. The positioning screw 10 is installed through the mounting frame and is locked with the mounting frame through a second thread structure; at least three positioning screws 10 are provided and are evenly spaced along the circumference of the mounting frame. The mounting frame provides installation support for the positioning screw 10. The mounting frame is sleeved outside the outer pipe body 201, the positioning screw 10 is adjusted so that the end of the positioning screw 10 in the installation channel 802 abuts against the outer wall of the outer pipe body 201, and then the positioning screw 10 is locked with the mounting frame through the second thread structure. The second thread structure can be a second threaded hole opened on the mounting frame or a second locking nut 12. Four positioning screws 10 are preferably provided.

[0050] In order to facilitate the adjustment of the distance between the connecting screw 9 and the positioning screw 10, preferably, a mounting hole 801 with a long hole structure is opened on the mounting frame. The length direction of the mounting hole 801 is parallel to the axial direction of the mounting frame; both the connecting screw 9 and the positioning screw 10 are installed through the mounting hole 801. The connecting screw 9 is locked with the mounting frame through a first locking nut 11, and the positioning screw 10 is locked with the mounting frame through a second locking nut 12. The connecting screw 9 and the positioning screw 10 can move positions in the mounting hole 801 with a long hole structure, thereby adjusting the distance between the connecting screw 9 and the positioning screw 10. Preferably, two first locking nuts 11 and two second locking nuts 12 are provided in pairs.

[0051] The outer pipe support 6 has various structural forms, such as it can be an upward-opening mounting groove which is fixedly installed on the support platform 501. Preferably, the outer pipe support 6 includes a V-shaped bracket 601 with an upward opening. The V-shaped bracket 601 is connected to the support frame 5 through a vertical adjustment structure; a plurality of outer pipe supports 6 are arranged at intervals along the x-axis direction. The outer pipe body 201 is placed on the upward-opening V-shaped bracket 601, and the outer pipe body 201 is adjusted to be horizontal by adjusting the vertical adjustment structure.

[0052] The vertical adjustment structure has various structural forms:

[0053] Embodiment 1. The vertical adjustment structure includes a first sleeve arranged vertically. A second sleeve is sleeved and installed outside the first sleeve. The first sleeve and the second sleeve are connected by bolts. The upper end of the first sleeve is connected to the V-shaped bracket 601, and the lower end of the second sleeve is connected to the support platform frame 5. A plurality of adjustment holes are provided on the second sleeve and are evenly spaced along the vertical direction. However, there is a technical problem of poor adjustment accuracy.

[0054] Embodiment 2. As a preferred embodiment, a through hole is provided on the support platform frame 5; the vertical adjustment structure includes a support screw rod 602 arranged vertically, and the support screw rod 602 is installed through the through hole; the upper end of the support screw rod 602 is connected to the V-shaped bracket 601; the support screw rod 602 is connected to the support platform frame 5 through an adjustment nut; a plurality of support screw rods 602 are provided, and the plurality of support screw rods 602 are evenly spaced. Specifically, the through hole is provided on the support platform 501, and the upper end of the support screw rod 602 is welded to the V-shaped bracket 601. The adjustment nut is in contact with the support platform 501. By rotating the adjustment nut, the support screw rod 602 can perform a linear upward or downward movement, thereby leveling the outer tube body 201 placed on the V-shaped bracket 601. By providing a plurality of support screw rods 602, and the plurality of support screw rods 602 are evenly spaced along the radial direction of the outer tube body 201, stable support for the outer tube body 201 can also be achieved.

[0055] Preferably, it further includes an inner tube hose clamp 15 and an outer tube hose clamp 16. Both the inner tube hose clamp 15 and the outer tube hose clamp 16 are located in the installation channel 802 and are arranged coaxially with the installation frame; a first connection block is slidably installed on the inner tube hose clamp 15, and the end of the connection screw rod 9 located within the installation channel 802 is connected to the first connection block; a second connection block is slidably installed on the outer tube hose clamp 16, and the end of the positioning screw rod 10 located within the installation channel 802 is connected to the second connection block. The outer tube hose clamp 16 is sleeved on the outer tube body 201. By sliding the second connection block along the circumferential direction of the outer tube hose clamp 16, the positioning screw rod 10 is placed in a suitable position, and then the positioning screw rod 10 is locked to the installation frame through the second locking nut 12. The outer tube hose clamp 16 also plays a role in protecting the outer tube body 201. The inner tube hose clamp 15 is sleeved on the inner tube 1. By sliding the first connection block along the circumferential direction of the inner tube hose clamp 15, the connection screw rod 9 is placed in a suitable position, and then the connection screw rod 9 is locked to the installation frame through the first locking nut 11. The inner tube hose clamp 15 not only plays a role in protecting the inner tube 1, but also plays a role in lifting the inner tube 1. Compared with lifting the inner tube 1 by manpower or a jacking mechanism, it is more convenient to adjust the gap between the smaller end of the adjusting pipe cap 202 and the outer wall of the inner tube 1.

[0056] Preferably, both ends of the mounting frame are provided with notches 17. The notches 17 are provided to facilitate construction workers to extend the welding gun into the mounting channel 802 for welding operations.

[0057] A jacketed pipe centering method, using a jacketed pipe centering assembly, includes the steps of:

[0058] S1, place the outer tube body 201 on the outer tube support 6, pass the inner tube 1 through the outer tube body 201, so that both ends of the inner tube 1 are located outside the outer tube body 201; pass the inner tube 1 through the tube cap 202, and arrange the end with the larger opening of the tube cap 202 adjacent to the outer tube body 201; both ends of the outer tube body 201 are provided with tube caps 202.

[0059] S2, lift the inner tube 1, and weld the end of the tube cap 202 with a larger opening to the outer tube body 201.

[0060] S3, installing the installation frame on the outer tube body 201 through the positioning structure.

[0061] The order of steps S2 and S3 can be interchanged.

[0062] As a preferred embodiment, an outer tube throat clamp 16 is provided on the outer tube body 201, and the end of the positioning screw 10 located in the installation channel 802 is connected to the second connection block on the outer tube throat clamp 16. The positioning screw 10 passes through the installation hole 801 and is then locked with the installation frame by the second locking nut 12. Thus, the installation frame is installed on the outer tube body 201. An inner tube throat clamp 15 is provided on the inner tube 1, and the end of the connecting screw 9 located in the installation channel 802 is connected to the first connection block on the inner tube throat clamp 15, and the connecting screw 9 passes through the installation hole 801 and is then locked with the installation frame by the first locking nut 11. The lifting of the inner tube 1 is achieved by the cooperation of the inner tube throat clamp 15, the connecting screw 9, the first locking nut 11 and the installation frame. After the outer tube body 201 and the inner tube 1 are roughly aligned, the end of the pipe cap 202 with the larger opening is welded to the outer tube body 201.

[0063] S4, adjusting the connecting screw 9 to make the gap between the end with the smaller opening of the pipe cap 202 and the outer wall of the inner pipe 1 uniform.

[0064] Adjust the connecting screw 9 to make the gap between the end with the smaller opening of the pipe cap 202 and the outer wall of the inner tube 1 uniform, so that the inner tube 1 and the outer tube 2 are aligned, and then weld the end with the smaller opening of the pipe cap 202 to the outer wall of the inner tube 1.

[0065] The above are the specific implementation manners of the present invention. It can be seen from the implementation process that the present invention provides a centering assembly and method for a jacketed pipe, which can quickly achieve the centering of the inner pipe and the outer pipe. It is beneficial to control the radial clearance between the smaller opening end of the pipe cap and the outer wall of the inner pipe, and is also beneficial to control the relative parallelism between the inner pipe and the outer pipe, thereby ensuring the installation quality of the inner pipe and the outer pipe. It has the advantages of convenient operation, easy implementation, high efficiency, etc.

Claims

1. Method for centering of jacketed pipe, characterized in that: Adopt a jacket pipe centering assembly, which includes a support stand (5) and an outer pipe support (6) installed on the support stand (5); It further includes an inner and outer pipe locking structure (7), and two of the inner and outer pipe locking structures (7) are provided; Taking the plane rectangular coordinate system as the reference system, one of the inner and outer pipe locking structures (7), the outer pipe support (6) and the other inner and outer pipe locking structure (7) are arranged in sequence along the x-axis direction; The inner and outer pipe locking structure (7) includes an installation frame, and a positioning structure and a screw group installed through the installation frame; The installation frame has an installation channel (802) for the outer pipe body (201) to pass through; The positioning structure is arranged close to the outer pipe support (6) and forms an outer pipe positioning space located in the installation channel (802); The screw group is arranged away from the outer pipe support (6) and forms an inner pipe positioning space located in the installation channel (802); the screw group includes a connecting screw (9), and the connecting screw (9) is installed through the installation frame and locked with the installation frame through a first thread structure; at least three connecting screws (9) are provided and are evenly spaced along the circumferential direction of the installation frame; Include the steps: S1. Place the outer pipe body (201) on the outer pipe support (6), pass the inner pipe (1) through the outer pipe body (201) so that both ends of the inner pipe (1) are outside the outer pipe body (201); pass the inner pipe (1) through the pipe cap (202), and the end with the larger opening of the pipe cap (202) is arranged adjacent to the outer pipe body (201); pipe caps (202) are provided at both ends of the outer pipe body (201); S2. Lift the inner pipe (1) and weld the end with the larger opening of the pipe cap (202) to the outer pipe body (201); S3. Install the installation frame on the outer pipe body (201) through the positioning structure; S4. Adjust the connecting screw (9) to make the gap between the end with the smaller opening of the pipe cap (202) and the outer wall of the inner pipe (1) uniform, and then weld the end with the smaller opening of the pipe cap (202) to the outer wall of the inner pipe (1).

2. The centering method for the jacketed pipe according to claim 1, wherein: The installation frame includes an installation plate (8), and multiple installation plates (8) are connected end to end in sequence and enclose a frame structure; adjacent two installation plates (8) are connected through a detachable connection structure; The connecting screw (9) is installed through the installation plate (8) and locked with the installation plate (8) through the first thread structure.

3. The centering method of the jacketed pipe according to claim 2, characterized in that: The detachable connection structure includes a connecting stud (13) provided on the installation plate (8), the connecting stud (13) passes through the connecting hole on the adjacent other installation plate (8) and is fastened by a fastening nut (14).

4. The centering method for the jacketed pipe according to claim 2, wherein: The positioning structure includes a positioning screw (10), and the positioning screw (10) is installed through the installation frame and locked with the installation frame through a second thread structure; At least three positioning screws (10) are provided and are evenly spaced along the circumferential direction of the installation frame.

5. The centering method of the jacketed pipe according to claim 4, characterized in that: The mounting frame is provided with mounting holes (801) having a long hole structure, and the length direction of the mounting holes (801) is parallel to the axial direction of the mounting frame; The connecting screw (9) and the positioning screw (10) are both installed through the mounting holes (801). The connecting screw (9) is locked with the mounting frame by a first locking nut (11), and the positioning screw (10) is locked with the mounting frame by a second locking nut (12).

6. The centering method for the jacketed pipe according to claim 1, characterized in that: The outer pipe support (6) includes a V-shaped bracket (601) with an upward opening, and the V-shaped bracket (601) is connected to the support bench (5) through a vertical adjustment structure; A plurality of the outer pipe supports (6) are arranged at intervals along the x-axis direction.

7. The centering method for the jacketed pipe according to claim 6, wherein: The support bench (5) is provided with through holes; The vertical adjustment structure includes a vertically arranged support screw (602), and the support screw (602) is installed through the through hole; the upper end of the support screw (602) is connected to the V-shaped bracket (601); the support screw (602) is connected to the support bench (5) through an adjusting nut; A plurality of the support screws (602) are provided, and the plurality of support screws (602) are arranged at uniform intervals.

8. The centering method for the jacketed pipe according to claim 4, characterized in that: It further includes an inner pipe hose clamp (15) and an outer pipe hose clamp (16). The inner pipe hose clamp (15) and the outer pipe hose clamp (16) are both located in the installation channel (802) and are coaxially arranged with the mounting frame; A first connecting block is slidably installed on the inner pipe hose clamp (15), and the end of the connecting screw (9) located within the installation channel (802) is connected to the first connecting block; A second connecting block is slidably installed on the outer pipe hose clamp (16), and the end of the positioning screw (10) located within the installation channel (802) is connected to the second connecting block.

9. The centering method of the jacketed pipe according to claim 1, wherein: Notches (17) are provided at both axial ends of the mounting frame.

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