A connection structure for HDPE pipes and its usage method

Abstract

The present invention discloses a connection structure of HDPE pipes and its usage method. The HDPE pipe and the connecting pipe are connected and locked in a form of cooperation between a shear groove and a shear rib. The mutually remote ends of the two connecting pipes respectively abut against the interface of the HDPE pipe at the connection part. By welding the two connecting pipes together, the connection of the two HDPE pipes can be achieved. By providing a connection part at the end of the HDPE pipe and sleeving the connecting pipe, the stiffness of the original HDPE pipe is increased, which can better reduce the deformation of the HDPE profile caused by creep such as temperature and gravity. The HDPE pipe and the connecting pipe can be respectively processed and formed in the factory. The connection of the corresponding two HDPE pipes is realized by welding between the two connecting pipes. The welding process is mature, reliable, fast, the connection effect is guaranteed, and the heat dissipation is fast after welding, so that the subsequent construction can be carried out as soon as possible.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline fusion welding structures. More specifically, the present invention relates to a connection structure of HDPE pipes and its usage method. Background Art

[0002] High-density polyethylene (HDPE) has good heat resistance and cold resistance, and good chemical stability; it also has relatively high rigidity and toughness, and good mechanical strength; its dielectric properties and environmental stress cracking resistance are also relatively good. This century has witnessed a revolutionary progress in the pipeline field, namely "replacing steel with plastic". HDPE pipes or pipe fittings are highly favored and widely used in gas transmission, water supply, sewage disposal, agricultural irrigation, conveying of fine particulate solids in mines, and fields such as oil fields, chemical industry, and postal and telecommunications, especially in gas transmission, where it has been widely applied.

[0003] HDPE will be melted between 190°C and 0°C, and the melting temperatures of different raw material grades vary slightly. Utilizing this property, the melted parts of two HDPE profiles are brought into full contact and maintained under appropriate pressure, which is generated by self-thermal expansion at the correct connection position. After cooling, the two can be firmly integrated. The connection methods of HDPE usually adopt electrofusion connection and hot melt butt joint. Currently, there are still the following problems in the connection of HDPE pipes or pipe fittings:

[0004] 1. The currently adopted hot melt butt joint method is of the socket type and requires a relatively large heating plate, with a size larger than the outer diameter of the pipe. First, the heating plate is heated, and then the heating plate is inserted between the butt-jointed pipes. After melting the material by transferring heat through the heating plate, the heating plate is removed, and then the pipes are butt-jointed. This will result in the loss of most of the energy, require a higher power for the equipment; have low working efficiency and a relatively long time; at the same time, there is a lot of manual operation content, and it is difficult to guarantee the quality.

[0005] 2. When using electrofusion welding, it is necessary to lay hot melt wires (sheets) on the pipe wall and set socket joints, which affects the appearance, requires a higher power for the equipment, and the length of each heating and welding is limited. Summary of the Invention

[0006] An object of the present invention is to solve at least the above problems and provide at least the advantages described later.

[0007] Another object of the present invention is to provide a connection structure of HDPE pipes and its usage method to solve the technical problems of low connection efficiency and difficult connection quality guarantee in the prior art for HDPE pipes.

[0008] To achieve these objects and other advantages according to the present invention, a connection structure for HDPE pipes is provided. At the end of each HDPE pipe, a connection part is extended. The outer diameter of the connection part is slightly smaller than that of the HDPE pipe. A shear groove is provided on the outer surface of the connection part. A connection pipe is sleeved outside the connection part. The length of the connection pipe is the same as that of the connection part. Shear ribs are correspondingly arranged on the inner side of the connection pipe to cooperate with the shear ribs. The two HDPE pipes to be connected are connected by circumferential welding between two corresponding connection pipes.

[0009] Preferably, the shear groove is an annular groove arranged around the HDPE pipe. The shear grooves are arranged at intervals along the length direction of the HDPE pipe. The shear ribs are annular ribs corresponding to the annular grooves.

[0010] Preferably, the shear groove is a shear hole uniformly arranged on the outer surface of the HDPE pipe. The shear rib is a shear post corresponding to the shear hole.

[0011] Preferably, the shear groove and the shear rib are a mutually matching thread structure.

[0012] Preferably, the outer diameter of the connection pipe is the same as that of the HDPE pipe.

[0013] Preferably, the HDPE pipe is a two-half split connection structure. The connection pipe is correspondingly arranged as two identical pipe segments. The two pipe segments are welded along the axial direction of the connection pipe.

[0014] Preferably, a lifting lug is further connected to the outside of the connection pipe.

[0015] The present invention also provides a method for using the connection structure of HDPE pipes, including the following steps:

[0016] S1. Process and connect the connection part of the HDPE pipe to be connected and the matching connection pipe in the factory to form a combined structure.

[0017] S2. Inspect the connection strength between the connection part and the connection pipe.

[0018] S3. Align the two combined structures relative to each other, and weld the two connection pipes by metal to connect the two HDPE pipes.

[0019] Preferably, in step S1, when processing and connecting the HDPE pipe and the connection pipe, heat the connection pipe to enhance the connection effect between the HDPE pipe and the connection pipe.

[0020] Preferably, in step S3, align the two combined structures by setting an alignment device. The alignment device includes:

[0021] A first limiting ring, whose inner diameter is consistent with the outer diameter of the HDPE pipe, is provided with a first limiting hole which penetrates in the axial direction, and a plurality of first limiting holes are symmetrically arranged along the circumference of the first limiting ring, the first limiting hole is a circular first hole portion on the side close to the center of the circle, and extends to a second hole portion on the side away from the center of the circle, the size of the second hole portion in the circumferential direction of the first limiting ring is smaller than the diameter of the first hole portion, and the length of the second hole portion in the radial direction is consistent with the length of the first hole portion from the inner side wall of the first limiting ring;

[0022] The second limiting ring has an inner diameter consistent with the outer diameter of the HDPE pipe and is assembled from two identical semicircular rings, the semicircular ring includes a limiting portion and a fastening portion, and a second limiting hole is respectively opened at the position corresponding to all the first limiting holes on the limiting portion, and the second limiting hole is a circular structure and consistent with the size of the first hole portion;

[0023] A latch, comprising a round rod, the diameter of which is consistent with the diameter of the first hole portion, a first clamping portion being arranged radially outward at one end of the round rod, the shape and size of the first clamping portion being consistent with the second hole portion, a second clamping portion being arranged axially at intervals at the middle portion of the outer side of the round rod, the second clamping portion and the first clamping portion being located at opposite ends in the radial direction of the round rod, the distance between the first clamping portion and the nearest second clamping portion being greater than the thickness of the first limiting ring, the distance between the farthest end of the second clamping portion and the axis in the radial direction of the round rod being equal to the outer diameter of the connecting tube, a latch being passed through each of the opposite first limiting holes and the second limiting holes, and the farthest end of the second clamping portion being used to abut against the outer side wall of the connecting tube;

[0024] When using the alignment device, one of the combined structures to be connected is inserted into the first limiting ring, and the other combined structure is embedded in a semicircular ring of the second limiting ring. The end faces of the two combined structures to be connected are in conflict with each other. Then, a pin is inserted into the second limiting hole on the corresponding installed semicircular ring and the first limiting hole on the opposite first limiting ring to adjust the coaxiality of the two combined structures. When inserting the pin, the second clamping part is inserted in the direction of entering the first limiting hole in sequence until the round rod enters the second limiting hole of the second limiting ring. Then, the pin is rotated and continued to be moved forward axially so that the first clamping part enters the second hole portion of the first limiting ring. Then, another semicircular ring is installed, and a pin is inserted into the second limiting hole on the other half of the semicircular ring. It is installed in the same way, and the pin is pushed into the first limiting hole on the corresponding first limiting ring. Then, the pin is continued to be moved forward axially and rotated until it enters a second limiting hole and the first clamping part enters the corresponding second hole portion. Finally, it is tightly connected through the fastening part between the two semicircular rings.

[0025] When welding the two connecting pipes, the pins at corresponding positions are pulled out crosswise to form a welding space.

[0026] The present invention has at least the following beneficial effects: In the connection structure of the HDPE pipe of the present invention, the HDPE pipe and the connecting pipe are connected and locked in a form of cooperation between a shear groove and a shear rib. The mutually remote ends of the two connecting pipes respectively abut against the interface of the HDPE pipe at the connection part. By welding the two connecting pipes together, the connection of the two HDPE pipes can be achieved. By providing a connection part at the end of the HDPE pipe and sleeving the connecting pipe, the stiffness of the original HDPE pipe is increased, and it can better reduce the deformation of the HDPE profile caused by creep such as temperature and gravity. The HDPE pipe and the connecting pipe can be processed and formed in the factory respectively. The connection of the corresponding two HDPE pipes is achieved through the welding between the two connecting pipes. The welding process is mature, reliable, fast, the connection effect is guaranteed, and the heat dissipation is fast after welding, so that the subsequent construction can be carried out as soon as possible.

[0027] Other advantages, objectives and features of the present invention will be partially reflected by the following description and partially understood by those skilled in the art through the research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The front view structure diagram of an embodiment of the connection structure of the HDPE pipe of the present invention;

[0029] Figure 2 The front view structure diagram of the connecting pipe of an embodiment of the connection structure of the HDPE pipe of the present invention;

[0030] Figure 3 The exploded structure diagram of the connection part and the connecting pipe of another embodiment of the connection structure of the HDPE pipe of the present invention;

[0031] Figure 4 The front view structure diagram of the alignment device of an embodiment of the present invention;

[0032] Figure 5 The side view structure diagram of the first limiting ring of an embodiment of the present invention;

[0033] Figure 6 The side view structure diagram of the second limiting ring of an embodiment of the present invention;

[0034] Figure 7 The side view structure diagram of the bolt of an embodiment of the present invention.

[0035] Description of the reference numerals in the drawings: 1. HDPE pipe; 2. Inner side of the HDPE pipe; 3. Connection part; 4. Connecting pipe; 5. Annular groove; 6. Annular rib; 7. Shear hole; 8. Shear column; 9. Lifting lug; 10. Composite structure; 11. First limiting ring; 12. First limiting hole; 13. First hole part; 14. Second hole part; 15. Second limiting ring; 16. Limiting part; 17. Fastening part; 18. Second limiting hole; 19. Plug; 20. Round bar; 21. First clamping part; 22. Second clamping part. Detailed implementation mode

[0036] The following further describes the present invention in detail with reference to the drawings, so that those skilled in the art can implement it according to the description in the specification.

[0037] It should be noted that, unless otherwise specified, the experimental methods described in the following implementation schemes are all conventional methods, and the reagents and materials, unless otherwise specified, can all be obtained from commercial channels; in the description of the present invention, the terms "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0038] As Figures 1-4 shown, the present invention provides a connection structure for HDPE pipes. The end of each HDPE pipe 1 extends to form a connection part 3. The outer diameter of the connection part 3 is slightly smaller than the outer diameter of the HDPE pipe 1. A shear groove is provided on the outer surface of the connection part 3. A connecting pipe 4 is sleeved outside the connection part 3. The length of the connecting pipe 4 is the same as the length of the connection part 3. Shear ribs are provided on the inner side of the connecting pipe 4 corresponding to the shear ribs for cooperation. The two HDPE pipes 1 to be connected are connected by circumferential welding between two corresponding connecting pipes 4.

[0039] The connecting pipe 4 is made of metal products, generally aluminum alloy, ordinary aluminum, stainless steel, carbon steel, etc. The HDPE pipe 1 and the connecting pipe 4 are connected and locked in the form of the cooperation between the shear groove and the shear rib. Then, by welding the two connecting pipes 4 together, the connection of the two HDPE pipes 1 can be completed. After welding, the mutually remote ends of the two connecting pipes 4 respectively abut against the interface of the HDPE pipe 1 at the connecting part 3 under the limiting effect that the outer diameter of the connecting part 3 is smaller than the pipe body of the HDPE pipe 1. By providing the connecting part 3 at the end of the HDPE pipe 1 and sleeving and connecting the connecting pipe 4, the stiffness of the original HDPE pipe 1 is increased, and the deformation of the HDPE profile caused by creep such as temperature and gravity can be better reduced. The HDPE pipe 1 and the connecting pipe 4 can be processed and formed in the factory respectively and leave the factory after passing the inspection, so the connection effect is guaranteed. The connection of the corresponding two HDPE pipes 1 is realized by welding between the two connecting pipes 4. The connecting pipe 4 is a metal product, the welding process is mature and reliable, the speed is fast, and the heat dissipation is fast after welding, so the subsequent construction can be carried out as soon as possible.

[0040] In another technical solution, as Figure 1 , 2 shown, the shear groove is an annular groove 5 arranged around the HDPE pipe 1, the shear grooves are arranged at intervals along the length direction of the HDPE pipe 1, and the shear ribs are annular ribs 6 arranged corresponding to the annular groove 5.

[0041] The HDPE pipe 1 itself has a certain toughness and can be melted between 190°C and 0°C according to different material compositions. When the metal connecting pipe 4 is sleeved into the connecting part 3 of the HDPE pipe 1, it is pushed axially into the connecting part 3 to the bottom, and each annular rib 6 respectively enters one annular groove 5, so as to lock the connection between the connecting pipe 4 and the HDPE pipe 1. By appropriately heating the connecting pipe 4, an appropriate amount of melting can be generated at the connecting part 3 of the HDPE pipe 1, which is convenient for and strengthens the connection effect with the connecting pipe 4.

[0042] In another technical solution, as Figure 3 shown, the shear groove is shear holes 7 uniformly arranged on the outer surface of the HDPE pipe 1, and the shear ribs are shear columns 8 arranged corresponding to the shear holes 7.

[0043] When the connecting pipe 4 is pushed into the connecting part 3 of the HDPE pipe 1, each shear column 8 enters one of the shear holes 7 to limit and lock the connection between the connecting pipe 4 and the HDPE pipe 1.

[0044] In another technical solution, the shear groove and the shear rib are mutually matching thread structures.

[0045] By providing the matching thread structure, the connecting pipe 4 can be screwed into the connecting part 3 to the top through the thread, and the connection is convenient.

[0046] In another technical solution, as Figures 1-4 shown, the outer diameter of the connecting pipe 4 is the same as that of the HDPE pipe 1. The outer diameters of the entire HDPE pipe 1 are the same, and the appearance between the connected HDPE pipes 1 is continuously beautiful, which is also convenient for the installation and fixation of the connection of the HDPE pipes 1 during construction.

[0047] In another technical solution, the HDPE pipe 1 is a split half-connection structure, and the connecting pipe 4 is correspondingly arranged as two identical pipe segments, and the two pipe segments are welded along the axial direction of the connecting pipe 4.

[0048] For HDPE pipes 1 with different structural forms, the corresponding connecting pipe 4 structure is adopted, and the two halves of the connecting pipe 4 are also connected into one body by metal welding.

[0049] In another technical solution, as Figure 2 shown, a lifting lug 9 is further connected to the outside of the connecting pipe 4. By providing the lifting lug 9, it is convenient to move or lift the HDPE pipe 1 as a whole.

[0050] The present invention also provides a use method of the connection structure of the HDPE pipe 1, as Figures 1-4 shown, including the following steps:

[0051] S1. Process and connect the connection part 3 of the HDPE pipe 1 to be connected and the corresponding connecting pipe 4 in the factory to form a combined structure 10;

[0052] S2. Inspect the connection strength between the connection part 3 and the connecting pipe 4;

[0053] S3. Align the two combined structures 10 relative to each other, and weld the two connecting pipes 4 by metal to connect the two HDPE pipes 1.

[0054] The connection between the HDPE profile and the special connection structure can be processed and formed in the factory, and inspected and accepted through drawing and other means. The welding between the connecting pipes 4 can adopt methods such as laser welding and ultrasonic welding. The HDPE pipes 1 are connected by welding the connecting pipes 4, with simple operation, firm connection, clear force, and continuous and beautiful appearance.

[0055] In another technical solution, in step S1, when processing and connecting the HDPE pipe 1 and the connecting pipe 4, the connecting pipe 4 is heated to enhance the connection effect between the HDPE pipe 1 and the connecting pipe 4.

[0056] In another technical solution, as Figures 4-7 shown, in step S3, the two combined structures 10 are aligned by setting an alignment device, and the alignment device includes:

[0057] The first limiting ring 11 has an inner diameter consistent with the outer diameter of the HDPE pipe 1. A first limiting hole 12 penetrating axially is formed in the first limiting ring 11. A plurality of first limiting holes 12 are symmetrically arranged along the circumference on the first limiting ring 11. The first limiting hole 12 has a circular first hole portion 13 on the side close to the center of the circle and extends to a second hole portion 14 on the side far from the center of the circle. The dimension of the second hole portion 14 in the circumferential direction of the first limiting ring 11 is smaller than the diameter of the first hole portion 13, and the length of the second hole portion 14 in the radial direction is consistent with the length of the first hole portion 13 from the inner side wall of the first limiting ring 11;

[0058] The second limiting ring 15 has an inner diameter consistent with the outer diameter of the HDPE pipe 1 and is assembled by two identical semi-circular rings. The semi-circular ring includes a limiting portion 16 and a fastening portion 17. A second limiting hole 18 is respectively formed at a position corresponding to all the first limiting holes 12 on the limiting portion 16. The second limiting hole 18 is a circular structure and has the same size as the first hole portion 13;

[0059] The bolt 19 includes a round rod 20. The diameter of the round rod 20 is consistent with the diameter of the first hole portion 13. One end of the round rod 20 is provided with a first clamping portion 21 radially outward. The shape and size of the first clamping portion 21 are both consistent with the second hole portion 14. Second clamping portions 22 are arranged at intervals along the axial direction in the middle of the outer side of the round rod 20. In the radial direction of the round rod 20, the second clamping portion 22 and the first clamping portion 21 are located at opposite ends. The distance between the first clamping portion 21 and the nearest second clamping portion 22 is greater than the thickness of the first limiting ring 11. In the radial direction of the round rod 20, the distance from the outermost end of the second clamping portion 22 to the axis is equal to the outer diameter of the connecting pipe 4. A bolt 19 is inserted through each pair of corresponding first limiting hole 12 and second limiting hole 18, and the outermost end of the second clamping portion 22 is used to abut against the outer side wall of the connecting pipe 4;

[0060] When using the alignment device, one of the combined structures 10 to be connected is inserted into the first limiting ring 11, and the other combined structure 10 is embedded in a semicircular ring of the second limiting ring 15. The end faces of the two combined structures 10 to be connected are in contact with each other, and then a pin 19 is inserted into the second limiting hole 18 on the installed semicircular ring and the first limiting hole 12 on the corresponding first limiting ring 11 to adjust the coaxiality of the two combined structures 10. When inserting the pin 19, the second clamping portion 22 is inserted in the direction of entering the first limiting hole 12 in sequence until the round rod 20 enters the second limiting ring 15. The first locking portion 21 enters the second hole 14 of the first limiting ring 11, and then another semicircular ring is installed. A locking pin 19 is inserted into the second limiting hole 18 on the other half of the semicircular ring. The locking pin 19 is installed in the same way, and the locking pin 19 is pushed into the first limiting hole 12 on the corresponding first limiting ring 11. The locking pin 19 is then moved forward along the axial direction and rotated until it enters a second limiting hole 18 and the first locking portion 21 enters the corresponding second hole 14. Finally, the two semicircular rings are tightly connected through the fastening portion 17 between them.

[0061] When welding the two connecting pipes 4, the latches 19 at corresponding positions are pulled out crosswise to form a welding space.

[0062] According to the needs, a latch 19 can be inserted into each group of the first limiting hole 12 and the second limiting hole 18 relative to each other, and the latch 19 is used to adjust the coaxial collinearity of the two HDPE pipes 1 to facilitate the connection firmness of the HDPE pipe 1 and improve the service life. The first clamping portion 21 and the second clamping portion 22 have the same length relative to the radial extension of the round rod 20, so that the second clamping portion 22 can first pass through the second hole portion 14, and then the second clamping portion 22 comes between the first limiting ring 11 and the second limiting ring 15, and then the round rod 20 is rotated to make the first clamping portion 21 located at the position of the second hole portion 14 and then enter the second hole portion 14, so that the second clamping portion 22 is also rotated to the position of the HDPE pipe 1. The radial direction is consistent, supporting and limiting the connecting pipe 4, and the round rod 20 as a whole is prevented from rotating by the limiting effect of the second hole portion 14 on the first clamping portion 21. Then, according to the welding requirements, the pins 19 at the welding location are pulled out to avoid interfering with the operation of the welding tool. After the welding is completed, all the pins 19 are pulled out and the second limiting ring 15 is removed. The first limiting ring 11 can also be made into a detachable two-half structure or be scratched from the corresponding HDPE pipe 1. The corresponding inner wall of the first limiting ring 11 can be made smoother to facilitate sliding on the HDPE pipe 1. The position of the fastening portion 17 on the second limiting ring 15 is symmetrically arranged relative to the position of the second limiting hole 18 to avoid affecting the position setting of the second limiting hole 18.

[0063] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrated examples described herein.

Claims

1. A method for using a connection structure of an HDPE pipe, characterized in that, At the end of each HDPE pipe, a connecting part is extendedly provided. The outer diameter of the connecting part is slightly smaller than that of the HDPE pipe. Shearing grooves are arranged on the outer surface of the connecting part. A connecting pipe is sleeved outside the connecting part. The length of the connecting pipe is the same as that of the connecting part. Shearing ribs are correspondingly arranged on the inner side of the connecting pipe to cooperate with the shearing grooves. The two HDPE pipes to be connected are connected by circumferential welding between two corresponding connecting pipes. The usage method includes the following steps: S1. Process and connect the connecting part to be connected and the matching connecting pipe in the factory to form a combined structure. S2. Inspect the connection strength between the connecting part and the connecting pipe. S3. Align the two combined structures by setting an aligning device, and the aligning device includes: A first limiting ring, the inner diameter of which is the same as the outer diameter of the HDPE pipe. A first limiting hole penetrating axially is opened on the first limiting ring. A plurality of first limiting holes are symmetrically arranged along the circumference on the first limiting ring. The first hole part of the first limiting hole on the side close to the center of the circle is circular, and extends to the second hole part on the side far from the center of the circle. The length of the second hole part in the radial direction of the first limiting ring is the same as the length of the first hole part from the inner side wall of the first limiting ring. A second limiting ring, the inner diameter of which is the same as the outer diameter of the HDPE pipe and is assembled by two identical semi-circular rings. The semi-circular ring includes a limiting part and a fastening part. A second limiting hole is respectively opened at the position corresponding to all the first limiting holes on the limiting part. The second limiting hole is a circular structure and has the same size as the first hole part. A plug pin, which includes a round rod. The diameter of the round rod is the same as the diameter of the first hole part. One end of the round rod is provided with a first clamping part extending radially outwards. The shape and size of the first clamping part are both the same as those of the second hole part. Second clamping parts are axially arranged at intervals in the middle of the outer side of the round rod. In the radial direction of the round rod, the second clamping part and the first clamping part are located at opposite ends. The distance between the first clamping part and the nearest second clamping part is greater than the thickness of the first limiting ring. In the radial direction of the round rod, the distance from the outermost end of the second clamping part to the axis of the first limiting ring is equal to the outer diameter of the connecting pipe. A plug pin is inserted through each pair of corresponding first limiting holes and the second limiting holes, and the outermost end of the second clamping part is used to abut against the outer side wall of the connecting pipe. When using the alignment device, insert one of the combined structures to be connected into the first limiting ring, embed the other combined structure into one semi-circular ring of the second limiting ring, make the end faces to be connected of the two combined structures contact each other, and then insert a pin through the second limiting hole on the installed semi-circular ring and the corresponding first limiting hole on the first limiting ring together to adjust the coaxiality of the two combined structures. When inserting the pin, insert it in the direction that the second clamping part enters the first limiting hole first in sequence until the round rod enters the second limiting hole of the second limiting ring, then rotate and continue to move the pin forward along the axis to make the first clamping part enter the second hole part of the first limiting ring. After that, install the other semi-circular ring, insert a pin into the second limiting hole on the other half of the semi-circular ring, install it in the same way, push the pin into the first limiting hole on the corresponding first limiting ring, then continue to move the pin forward along the axis and rotate until it enters a second limiting hole and the first clamping part enters the corresponding second hole part, and finally tightly connect through the fastening part between the two semi-circular rings; When welding the two connecting pipes, pull out the pins at the corresponding positions crosswise to form a welding space, and weld the two connecting pipes through metal to connect the two HDPE pipes.

2. The usage method of a connection structure of an HDPE pipe as described in claim 1, characterized in that, The shear groove is an annular groove arranged around the HDPE pipe, the shear grooves are arranged at intervals along the length direction of the HDPE pipe, and the shear ribs are annular ribs arranged corresponding to the annular grooves.

3. The usage method of a connection structure of an HDPE pipe as described in claim 1, characterized in that, The shear groove is a shear hole uniformly arranged on the outer surface of the HDPE pipe, and the shear rib is a shear column arranged corresponding to the shear hole.

4. The usage method of a connection structure of an HDPE pipe according to claim 1, characterized in that, The shear groove and the shear rib are a threaded structure that cooperate with each other.

5. The usage method of a connection structure of an HDPE pipe as described in claim 1, characterized in that, The outer diameter of the connecting pipe is the same as the outer diameter of the HDPE pipe.

6. The usage method of a connection structure of an HDPE pipe as described in claim 1, characterized in that, The HDPE pipe is a two-half half-coupling connection structure, the connecting pipe is correspondingly arranged as two identical pipe segments, and the two pipe segments are welded axially along the connecting pipe.

7. The usage method of a connection structure of an HDPE pipe according to any one of claims 1-6, characterized in that, A lifting lug is also connected to the outside of the connecting pipe.

8. The usage method of a connection structure of an HDPE pipe according to claim 1, characterized in that, In step S1, when processing and connecting the HDPE pipe and the connecting pipe, heat the connecting pipe to increase the connection effect between the HDPE pipe and the connecting pipe.

9. The usage method of a connection structure of an HDPE pipe as described in claim 1, characterized in that, The dimension of the second hole part in the circumferential direction of the first limiting ring is smaller than the diameter of the first hole part.

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