CN115405791A - Corrugated pipe expansion joint and manufacturing method thereof - Google Patents

Corrugated pipe expansion joint and manufacturing method thereof Download PDF

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Publication number
CN115405791A
CN115405791A CN202211006100.6A CN202211006100A CN115405791A CN 115405791 A CN115405791 A CN 115405791A CN 202211006100 A CN202211006100 A CN 202211006100A CN 115405791 A CN115405791 A CN 115405791A
Authority
CN
China
Prior art keywords
pipe
end part
corrugated pipe
welding
expansion joint
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211006100.6A
Other languages
Chinese (zh)
Inventor
闫廷来
侯伟
张小文
杨玉强
李瑞琴
张国华
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China State Shipbuilding Corp Ltd
CSSC Shuangrui Luoyang Special Equipment Co Ltd
Original Assignee
China State Shipbuilding Corp Ltd
CSSC Shuangrui Luoyang Special Equipment Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China State Shipbuilding Corp Ltd, CSSC Shuangrui Luoyang Special Equipment Co Ltd filed Critical China State Shipbuilding Corp Ltd
Priority to CN202211006100.6A priority Critical patent/CN115405791A/en
Publication of CN115405791A publication Critical patent/CN115405791A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L51/00—Expansion-compensation arrangements for pipe-lines
    • F16L51/02—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube
    • F16L51/03—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube comprising two or more bellows
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D17/00—Forming single grooves in sheet metal or tubular or hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D41/00—Application of procedures in order to alter the diameter of tube ends
    • B21D41/02—Enlarging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
    • B23K37/053—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor
    • B23K37/0533—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor external pipe alignment clamps
    • 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
    • F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
    • F16L13/02—Welded joints
    • 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
    • F16L51/00—Expansion-compensation arrangements for pipe-lines
    • F16L51/02—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube
    • F16L51/025—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube with several corrugations
    • 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
    • F16L51/00—Expansion-compensation arrangements for pipe-lines
    • F16L51/02—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube
    • F16L51/027—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube with external reinforcement
    • 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
    • F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
    • F16L57/02—Protection of pipes or objects of similar shape against external or internal damage or wear against cracking or buckling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/04—Tubular or hollow articles
    • B23K2101/06—Tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/02—Iron or ferrous alloys
    • B23K2103/04—Steel or steel alloys
    • B23K2103/05—Stainless steel

Abstract

The invention provides a corrugated pipe expansion joint and a manufacturing method thereof. By adopting the middle pipe and the end pipe with the diameter-expanding structure or using a welding backing ring, the welding mode between the middle pipe and the end pipe and between the first corrugated pipe and the second corrugated pipe is changed into butt welding, the problems of hot cracks, deformation, burning-through and large heat affected zone of the welding of the low-carbon austenitic stainless steel with large diameter and small wall thickness are solved, and the appearance quality and the mechanical property of a key pressed circumferential welding seam of the corrugated pipe and the capability of resisting transverse deformation and tearing of the welding seam at the end part are greatly improved.

Description

Corrugated pipe expansion joint and manufacturing method thereof
Technical Field
The invention relates to the field of product structure design, in particular to a corrugated pipe expansion joint and a manufacturing method thereof.
Background
The operating conditions in the field of LNG transportation are essentially carried out at a low temperature of-163 ℃. The metal pipeline material for directly conveying LNG is required to meet the requirement of low-temperature plasticity, and the problem of cold shrinkage of the material when the material is cooled from normal temperature to ultralow temperature can be solved. The low-carbon austenitic stainless steel is nonmagnetic and has higher toughness and plasticity, and particularly the excellent low-temperature toughness of the low-carbon austenitic stainless steel enables the low-carbon austenitic stainless steel to be widely applied to ultralow-temperature engineering as a low-temperature structural material, so that the low-carbon austenitic stainless steel is an ideal material for LNG conveying pipelines. The low-carbon austenitic stainless steel can be well suitable for fusion welding in general, has good plasticity and toughness in a welding state, but has higher welding hot crack sensitivity. In particular, in welded structures having large diameters and small wall thicknesses, problems of weld cracking, distortion, burn-through, and large heat affected zones are prevalent.
The low-temperature expansion joint at the upper air dome part of the LNG transport ship has the external dimension of DN1400-DN1500, and belongs to a large size, the wall thickness of the corrugated pipe is 0.8mm-1.2mm, the wall thickness of the end part of the middle pipe is 2.0mm-3.0mm, the wall thicknesses of the corrugated pipe and the end part of the middle pipe are small, and the thickness difference exists between the corrugated pipe and the end part of the middle pipe. At present, an inlet gas dome expansion joint mainly comprises a hoisting assembly, a corrugated pipe I, a middle pipe, a corrugated pipe II and an end pipe, wherein the components are welded in an overlapping mode. Because the air dome expansion joint is in actual service, the transverse displacement of +/-10 mm exists. The fillet weld in the lap joint form has high tensile strength but poor bending strength, is easy to cause fatigue failure, and is easy to cause quality defects such as large welding heat affected zone, weld burn-through, weld crack, repair welding and the like.
On the other hand, under the influence of the construction and monitoring of the LNG ship and various working modes, the LNG expansion joint has certain negative pressure working condition running conditions. The middle pipe of the air dome expansion joint is easy to deform and fail due to material yield under a negative pressure state because of large external dimension and thin wall thickness. Particularly, under the condition that the transverse displacement of +/-10 mm and the negative pressure working condition are superposed, the possibility of failure and damage is extremely high.
Disclosure of Invention
In order to solve the technical problems, the invention provides a bellows expansion joint and a manufacturing method thereof, which solve the problems of large-diameter and small-wall-thickness low-carbon austenitic stainless steel welding hot cracks, deformation, burnthrough and large heat affected zone.
The purpose of the invention is realized by the following scheme: a corrugated pipe expansion joint comprises a hoisting assembly, a first corrugated pipe, a middle pipe, a second corrugated pipe and an end pipe.
The straight edge of the lower end part of the first corrugated pipe is connected with the upper end part of the middle pipe in a welding mode, and the lower end part of the middle pipe is connected with the straight edge of the upper end part of the second corrugated pipe in a welding mode.
A plurality of convex reinforcing structures are arranged on the middle pipe.
The upper end part of the first corrugated pipe is welded with the hoisting assembly, and the lower end part of the second corrugated pipe is welded with the end pipe.
Preferably, both end portions of the intermediate pipe welded to the first bellows and the second bellows have an enlarged diameter structure.
Preferably, the upper end portion of the end pipe has an enlarged diameter structure.
Preferably, the number of the convex reinforcing structures arranged on the middle pipe is not less than 1.
Preferably, the first corrugated tube and the second corrugated tube are welded to both ends of the intermediate tube having the diameter-expanding structure by butt welding, and the end tube having the diameter-expanding structure is welded to the lower end of the second corrugated tube by butt welding.
Preferably, welding backing rings are arranged at the positions of welding seams of the straight sides of the first corrugated pipe and the second corrugated pipe and two end parts of the middle pipe, and the welding backing rings are arranged at the positions of welding seams of the lower end part of the second corrugated pipe and the upper end part of the end pipe.
Preferably, the welding mode of the first corrugated pipe, the second corrugated pipe and the end part of the middle pipe is butt welding with a welding pad ring, and the welding mode of the lower end part of the second corrugated pipe and the upper end part of the end pipe is butt welding with a welding pad ring.
The invention further provides a method for manufacturing the corrugated pipe expansion joint, in addition to the corrugated pipe expansion joint, which comprises the following specific steps:
step 1: the two end parts of the middle pipe and the upper end part of the end pipe are processed into diameter expanding structures.
Step 2: and manufacturing a plurality of convex reinforcing structures at proper positions of the middle pipe.
And step 3: and welding the hoisting assembly with the upper end part of the first corrugated pipe, the upper end part of the middle pipe with the lower end part of the first corrugated pipe, the lower end part of the middle pipe with the upper end part of the second corrugated pipe, and the lower end part of the second corrugated pipe with the upper end part of the end pipe to complete the manufacture of the corrugated pipe expansion joint.
Preferably, in step 1, the method for expanding the diameter of the intermediate pipe and the end pipe comprises a mechanical expansion method.
Preferably, in step 2, the method for manufacturing the male-type reinforcing structure on the intermediate pipe includes a mechanical expansion method and a hydraulic forming method.
Compared with the prior art, the invention has the following advantages:
according to the corrugated pipe expansion joint and the manufacturing method thereof, the outer convex type reinforcing structure is additionally arranged on the middle pipe, so that the external pressure instability resistance and transverse collapse deformation resistance of the corrugated pipe expansion joint are enhanced. By expanding the end parts of the middle pipe and the end pipe or increasing the welding backing ring, the problems of large-diameter and small-wall-thickness low-carbon austenitic stainless steel welding hot cracks, deformation, burnthrough and large heat affected zone are solved, and the welding quality of a key pressed circumferential welding seam of the corrugated pipe is greatly improved. The bellows expansion joint and the manufacturing method thereof provided by the invention can be widely applied to the fields of low-temperature LNG, air-cooled power plants and the like.
Drawings
FIG. 1 is a schematic view of the expansion joint of the present invention;
FIG. 2 is a partial schematic view of the convex reinforcing structure of the present invention;
FIG. 3 is a schematic view illustrating a straight edge of a lower end portion of a first bellows and an upper end portion of a middle tube having an expanded diameter structure according to an embodiment of the present invention;
FIG. 4 is a schematic view illustrating a straight edge of a lower end portion of a second bellows and an upper end portion of an end tube having an expanded diameter structure according to an embodiment of the present invention;
FIG. 5 is a schematic view of a straight edge of a lower end of a first bellows being welded to an upper end of a middle tube having a welding gasket ring according to an embodiment of the present invention;
FIG. 6 is a schematic view illustrating a welding between a straight edge of a lower end of a second bellows and an upper end of a middle tube having a welding gasket ring according to an embodiment of the present invention.
In the figure, 1 is a hoisting assembly; 2 is a first corrugated pipe; 3 is a middle tube; 4 is a second corrugated pipe; 5 is an end pipe; 6 is a convex reinforcing structure; 7 has an expanding structure; and 8, a welding backing ring.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
As shown in fig. 1 to fig. 2, in the technical solution of the present invention, a bellows expansion joint is provided, which includes a hoisting assembly 1, a first bellows 2, a middle pipe 3, a second bellows 4, and an end pipe 5.
Wherein, the straight edge of the lower end part of the first corrugated pipe 2 is connected with the upper end part of the middle pipe 3 by welding, and the straight edge of the lower end part of the middle pipe 3 is connected with the straight edge of the upper end part of the second corrugated pipe 4 by welding.
On the intermediate pipe 3, a plurality of outwardly convex reinforcing structures 6 are arranged.
The upper end part of the first corrugated pipe 2 is connected with the hoisting component 1 in a welding way, and the lower end part of the second corrugated pipe 4 is connected with the end pipe 5 in a welding way.
In some embodiments of the present invention, both end portions of the intermediate pipe 3 welded to the first bellows 2 and the second bellows 4 have the diameter-expanding structures 7, and the upper end portions of the end pipes have the diameter-expanding structures 7. In the embodiments, the end part of the middle pipe 3 and the upper end part of the end pipe 5 are arranged into the expanding structure 7, so that the integral assembling form of the expansion joint of the corrugated pipe is changed, the welding seams of all parts of the expansion joint of the corrugated pipe are changed from the traditional fillet welding seams into butt welding seams, and the welding quality in the assembling process of the expansion joint of the corrugated pipe is improved.
In some embodiments of the invention, there are 3 male reinforcing structures 6 arranged on the intermediate pipe 3. In these embodiments, the external pressure instability resistance and the lateral collapse deformation resistance of the bellows expansion joint can be enhanced by adding the convex reinforcing structure 6 to the intermediate tube 3.
As shown in fig. 3 to 4, in some embodiments of the present invention, the first corrugated tube 2 and the second corrugated tube 4 are welded to both end portions of the intermediate tube 3 having the diameter expanding structure 7 in a butt welding manner. The upper end of the end pipe 5 having the diameter-expanding structure 7 is welded to the lower end of the second bellows 4 by butt welding.
As shown in fig. 5 to 6, in some embodiments of the present invention, a welding backing ring 8 is provided at the position of the welding seam between the straight sides of the first bellows 2 and the second bellows 4 and the end of the middle pipe 3, and a welding backing ring 8 is provided at the position of the welding seam between the lower end of the second bellows 4 and the upper end of the end pipe 5. In these embodiments, the welding of the first bellows 2 and the second bellows 4 to the end of the middle tube 3 is performed by butt welding with a welding pad ring 8, and the welding of the lower end of the second bellows 4 to the upper end of the end tube 5 is performed by butt welding with a welding pad ring 8.
The technical scheme of the invention provides a corrugated pipe expansion joint, and further provides a method for manufacturing the corrugated pipe expansion joint, which comprises the following specific steps:
step 1: both end portions of the intermediate pipe 3 and the upper end portions of the end pipes 5 are processed into diameter-expanding structures 7.
And 2, step: a plurality of convex reinforcing structures 6 are formed at appropriate positions of the intermediate pipe 3.
And step 3: and welding the hoisting assembly 1 with the upper end part of the first corrugated pipe 2, the upper end part of the middle pipe 3 with the lower end part of the first corrugated pipe 2, the lower end part of the middle pipe 3 with the upper end part of the second corrugated pipe 4, and the lower end part of the second corrugated pipe 4 with the upper end part of the end pipe 5 to finish the manufacture of the corrugated pipe expansion joint.
In some embodiments of the invention, the bellows expansion joint is made by the following method:
step 1: the two end parts of the middle pipe 3 and the upper end part of the end pipe 5 are processed into an expanding structure 7 by adopting a mechanical expansion method.
And 2, step: 3 convex reinforcing structures 6 are manufactured at proper positions of the middle pipe 3 by adopting a mechanical bulging method.
And 3, step 3: and welding the hoisting assembly 1 and the upper end part of the first corrugated pipe 2, the upper end part of the middle pipe 3 and the lower end part of the first corrugated pipe 2, the lower end part of the middle pipe 3 and the upper end part of the second corrugated pipe 4, and the lower end part of the second corrugated pipe 4 and the upper end part of the end pipe 5 in a butt welding mode, and finishing the manufacture of the corrugated pipe expansion joint.
In some embodiments of the invention, the method of making the male reinforcing structure 6 on the middle tube 3 in step 2 further comprises hydroforming.
The foregoing is a preferred embodiment of the present invention, and it should be noted that it would be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the principles of the invention, and such modifications and enhancements are also considered to be within the scope of the invention.

Claims (10)

1. The utility model provides a bellows expansion joint, includes lifting by crane subassembly (1), first bellows (2), intermediate tube (3), second bellows (4) and end pipe (5), its characterized in that:
the straight edge of the lower end part of the first corrugated pipe (2) is connected with the upper end part of the middle pipe (3) in a welding manner, and the straight edge of the lower end part of the middle pipe (3) is connected with the straight edge of the upper end part of the second corrugated pipe (4) in a welding manner;
a plurality of external convex reinforcing structures (6) are arranged on the middle pipe (3);
the upper end part of the first corrugated pipe (2) is connected with the hoisting assembly (1) in a welded mode, and the lower end part of the second corrugated pipe (4) is connected with the end pipe (5) in a welded mode.
2. A bellows expansion joint as claimed in claim 1, wherein: the two ends of the middle pipe (3) welded with the first corrugated pipe (2) and the second corrugated pipe (4) are provided with expanding structures (7).
3. A bellows expansion joint as claimed in claim 1, wherein: the upper end part of the end pipe (5) is provided with the diameter expanding structure (7).
4. A bellows expansion joint as claimed in claim 1, wherein: the number of the convex-type reinforcing structures (6) arranged on the middle pipe (3) is not less than 1.
5. A bellows expansion joint as claimed in claim 1, wherein: the first corrugated pipe (2) and the second corrugated pipe (4) are welded with two ends of the middle pipe (3) with the diameter expanding structure (7) in a butt welding mode; the upper end part of the end pipe (5) with the diameter expanding structure (7) and the lower end part of the second corrugated pipe (4) are welded in a butt welding mode.
6. A bellows expansion joint as claimed in claim 1, wherein: welding backing rings (8) are arranged at the positions of welding seams of the straight sides of the first corrugated pipe (2) and the second corrugated pipe (4) and two ends of the middle pipe (3); and the welding backing ring (8) is arranged at the position of a welding seam between the lower end part of the second corrugated pipe (4) and the upper end part of the end pipe (5).
7. A bellows expansion joint as claimed in claim 6, wherein: the first corrugated pipe (2) and the second corrugated pipe (4) are welded with the two ends of the middle pipe (3) in a butt welding mode with the welding backing rings (8); the lower end part of the second corrugated pipe (4) and the upper end part of the end pipe (5) are welded in a butt welding mode with the welding backing ring (8).
8. A manufacturing method of a corrugated pipe expansion joint is characterized by comprising the following steps: the method is used for manufacturing the corrugated pipe expansion joint as claimed in any one of claims 1 to 7, and comprises the following specific steps:
step 1: processing two end parts of the middle pipe (3) and the upper end part of the end pipe (5) into the diameter expanding structure (7);
step 2: manufacturing a plurality of externally convex reinforcing structures (6) at proper positions of the middle pipe (3);
and step 3: and welding the hoisting assembly (1) and the upper end part of the first corrugated pipe (2), the upper end part of the middle pipe (3) and the lower end part of the first corrugated pipe (2), the lower end part of the middle pipe (3) and the upper end part of the second corrugated pipe (4), and the lower end part of the second corrugated pipe (4) and the upper end part of the end pipe (5) to finish the manufacture of the corrugated pipe expansion joint.
9. A method of manufacturing a bellows expansion joint according to claim 8, wherein: in the step 1, the method for expanding the ports of the middle pipe (3) and the end pipe (5) comprises a mechanical expansion method.
10. A method of manufacturing a bellows expansion joint according to claim 8, wherein: in the step 2, the method for manufacturing the male-type reinforcing structure (6) on the intermediate pipe (3) comprises a mechanical bulging method and a hydroforming method.
CN202211006100.6A 2022-08-22 2022-08-22 Corrugated pipe expansion joint and manufacturing method thereof Pending CN115405791A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211006100.6A CN115405791A (en) 2022-08-22 2022-08-22 Corrugated pipe expansion joint and manufacturing method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211006100.6A CN115405791A (en) 2022-08-22 2022-08-22 Corrugated pipe expansion joint and manufacturing method thereof

Publications (1)

Publication Number Publication Date
CN115405791A true CN115405791A (en) 2022-11-29

Family

ID=84161009

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211006100.6A Pending CN115405791A (en) 2022-08-22 2022-08-22 Corrugated pipe expansion joint and manufacturing method thereof

Country Status (1)

Country Link
CN (1) CN115405791A (en)

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