Municipal pipeline maintenance device

Abstract

The utility model belongs to the technical field of municipal pipeline maintenance and relates to a municipal pipeline maintenance device which comprises a first connecting pipe and a second connecting pipe, the outer side wall of the right end of the first connecting pipe is in threaded connection with an adapting pipe, and an inserting pipe is fixedly arranged on the right side wall of the adapting pipe. An annular inserting groove matched with the inserting pipe in an inserted mode is formed in the left side wall of the second connecting pipe, and a first sealing ring is arranged in the annular inserting groove. When the maintenance device is used, the left end of a first connecting pipe and the right end of a new HDPE pipe can be subjected to hot melting welding, the left end of the new HDPE pipe and a cutting opening of a left pipeline are subjected to hot melting welding, the right end of a second connecting pipe and a cutting opening of a right pipeline are subjected to hot melting welding, and an adapting pipe is connected between the right end of the first connecting pipe and the left end of the second connecting pipe; when the new HDPE pipe and the left pipeline are subjected to hot-melt welding and the second connecting pipe and the right pipeline are subjected to hot-melt welding, the new HDPE pipe and the second connecting pipe can be moved in the axial direction, hot-melt butt joint extrusion force at a left pipeline cutting opening and a right pipeline cutting opening can be ensured, and the structural strength of the hot-melt welding position can be ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of municipal pipeline maintenance, and relates to a municipal pipeline maintenance device. Background Art

[0002] HDPE pipes are commonly used in municipal pipelines. Heat-melt welding is typically used during municipal pipe network installation: After the joint ends of two HDPE pipes are simultaneously heat-melted, the next HDPE pipe is moved axially to squeeze and butt the two pipes together until the joint cools and takes shape. For severely damaged HDPE municipal pipes, the damaged section is cut and a new section is heat-melted. However, due to the fixed spacing between the two cuts in the municipal pipe, heat-melting the new HDPE pipe to the cuts is difficult, making it difficult to move the HDPE pipe axially during heat-melt welding. This results in insufficient heat-melt extrusion and a weak connection. Utility Model Content

[0003] The purpose of the utility model is to provide a municipal pipeline maintenance device to solve the problem of relatively weak connection strength at the hot-melt welding point when cutting and replacing existing HDPE municipal pipelines proposed in the above background technology.

[0004] The utility model is achieved through the following technical solutions:

[0005] The pipe is threadedly connected to the outer wall of the first connecting pipe and the second connecting pipe, and the right side wall of the connecting pipe is fixedly provided with an insert pipe, and the left side wall of the second connecting pipe is provided with an annular slot for plugging and cooperating with the insert pipe, and a first sealing ring is provided in the annular slot; when the HDPE municipal pipe is cut and replaced, the left end of the first connecting pipe is hot-melt welded to the right end of the new HDPE pipe, the left end of the new HDPE pipe is hot-melt welded to the cut end of the left pipe, and the right end of the second connecting pipe is hot-melt welded to the cut end of the right pipe, and the connecting pipe is connected between the right end of the first connecting pipe and the left end of the second connecting pipe. Based on the fact that the sum of the axial lengths of the new HDPE pipe, the first connecting pipe and the second connecting pipe is less than the fixed spacing between the cut end of the left pipe and the cut end of the right pipe, the new HDPE pipe and the second connecting pipe can be moved axially when the new HDPE pipe is hot-melt welded to the left pipe and the second connecting pipe is hot-melt welded to the right pipe, so as to ensure the hot-melt butt extrusion force at the cut end of the left pipe and the cut end of the right pipe, and to ensure the structural strength of the hot-melt welding.

[0006] Further definition, the right end of the receiving tube and the left end of the second connecting tube are both integrally formed with an annular flange, and the two annular flanges can be fixedly connected by multiple bolt and nut assemblies, which can improve the reliability of the connection structure between the second connecting tube and the receiving tube to prevent the two from moving axially and causing the sealing structure formed by the first sealing ring in the annular slot to loosen.

[0007] Further definition, the inner side wall of each annular flange is fixedly provided with a sealing gasket. When the receiving tube is rotated to insert the insert into the annular slot, the right end of the insert squeezes the first sealing ring to form a seal in the annular slot. The two annular flanges move closer to each other to squeeze the sealing gasket to form a seal. The double sealing structure can improve the sealing of the municipal pipeline after maintenance.

[0008] Further definition, a spring and a retaining ring are provided in the annular slot, and the retaining ring is located between the first sealing ring and the spring; when the rotating receiving tube causes the cannula to be inserted into the annular slot, the right end of the cannula squeezes the first sealing ring, the spring is compressed, and the spring generates a reaction force on the retaining ring, so that the right end of the cannula and the retaining ring bidirectionally squeeze the first sealing ring to form a seal in the annular slot, and at the same time, the two annular flanges move closer to each other to squeeze the sealing gasket to form a seal. Based on the variability of the spring axis length, it can be ensured that when the rotating receiving tube causes the two annular flanges to squeeze the sealing gasket to form a seal, the first sealing ring in the annular slot is also squeezed to form a seal in the annular slot, so as to prevent the sealing gasket between the two annular flanges from being squeezed into place after the cannula is inserted into the annular slot, resulting in an inadequate seal between the two annular flanges.

[0009] It is further defined that the first connecting pipe and the second connecting pipe are both HDPE pipes, which are made of the same material as the left pipe, the right pipe and the new HDPE pipe, and can ensure the structural strength of the hot-melt welding points between them.

[0010] Further definition, the outer wall of the middle section of the first connecting pipe and the outer wall of the middle section of the second connecting pipe are both welded with discs, and the outside of one of the discs is covered with an axially movable sleeve, and the side wall of the sleeve is provided with a grouting port and a return port. When the two ends of the sleeve are respectively covered on the two discs, a casting cavity can be formed between the two discs; cement slurry, PVC glue, epoxy resin glue or polyurethane glue, etc. are injected into the casting cavity through the grouting port to form a sealing layer in the casting cavity, so as to improve the structural strength and sealing of the connection between the first connecting pipe, the receiving pipe and the second connecting pipe. The grouting port and the return port are respectively located at the left and right ends of the sleeve. Grouting is performed from the grouting port, and the injection is stopped when the grouting returns from the return port, which can facilitate observation and ensure the fullness of the slurry in the casting cavity.

[0011] According to a further definition, a third sealing ring is fixedly mounted on the outer wall of each disc, and the third sealing ring can seal the gap between the sleeve and the disc to prevent the slurry from leaking from the gap between the sleeve and the disc when grouting into the casting cavity.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The repair device can be used for cutting, replacing and repairing HDPE municipal pipes. The damaged pipe is cut off to form a left pipe cutting opening and a right pipe cutting opening. A new pipe needs to be flushed and installed between the two to form a continuous pipe. The left end of the first connecting pipe can be hot-melt welded to the right end of the cut new HDPE pipe, the left end of the new HDPE pipe can be hot-melt welded to the cutting opening of the left pipe, and the right end of the second connecting pipe can be hot-melt welded to the cutting opening of the right pipe. The connecting pipe is connected between the right end of the first connecting pipe and the left end of the second connecting pipe. Specifically, the connecting pipe is rotated so that the insert at the right end of the connecting pipe is inserted into the annular slot and the first sealing ring is squeezed to form a seal in the annular slot. Based on the fact that the sum of the axial lengths of the new HDPE pipe, the first connecting pipe and the second connecting pipe is less than the fixed distance between the left pipe cutting opening and the right pipe cutting opening, the new HDPE pipe and the second connecting pipe can be moved axially when the new HDPE pipe is hot-melt welded to the left pipe and the second connecting pipe is hot-melt welded to the right pipe, so as to ensure the hot-melt butt extrusion force at the left pipe cutting opening and the right pipe cutting opening, ensure the structural strength of the hot-melt weld, and ensure the quality of the hot-melt weld. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0015] Figure 1 This is a schematic cross-sectional view of the utility model;

[0016] Figure 2 This is a schematic diagram of the three-dimensional explosion structure of the utility model;

[0017] Figure 3 This is a schematic diagram of the installation structure of the utility model.

[0018] The names of the components in the figure are: 1. First connecting pipe; 2. Socket; 3. Insert; 4. First sealing ring; 5. Second connecting pipe; 5.1. Annular slot; 6. Spring; 7. Retaining ring; 8. Annular flange; 9. Bolt and nut assembly; 10. Sealing gasket; 11. Return port; 12. Sleeve; 13. Disc; 14. Third sealing ring; 15. Grouting port; 16. Left pipe; 17. Right pipe; 18. New HDPE pipe; 19. Casting cavity. DETAILED DESCRIPTION

[0019] The following embodiments of the technical solution of the present invention are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0020] In the description of this application, it should be understood that the terms "inside", "outside", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0021] A municipal pipeline maintenance device, such as Figure 1 and Figure 2 As shown, it includes a first connecting pipe 1 and a second connecting pipe 5;

[0022] The outer wall of the right end of the first connecting tube 1 is threadedly connected to a receiving tube 2, and a cannula 3 is fixedly provided on the right side wall of the receiving tube 2. The left side wall of the second connecting tube 5 is provided with an annular slot 5.1 for plugging with the cannula 3. A first sealing ring 4, a spring 6 and a retaining ring 7 are provided in the annular slot 5.1. The retaining ring 7 is located between the first sealing ring 4 and the spring 6.

[0023] The right end of the receiving pipe 2 and the left end of the second connecting pipe 5 are both integrally formed with an annular flange 8, and the two annular flanges 8 can be fixedly connected by a plurality of bolt and nut assemblies 9; a sealing gasket 10 is fixedly provided on the inner side wall of each annular flange 8;

[0024] The outer wall of the middle section of the first connecting pipe 1 and the outer wall of the middle section of the second connecting pipe 5 are both welded with a disc 13, and an axially movable sleeve 12 is sleeved on the outside of one of the discs 13. The side wall of the sleeve 12 is provided with a grouting port 15 and a return port 11. When the two ends of the sleeve 12 are respectively sleeved on the two discs 13, a casting cavity 19 can be formed between the two discs 13. A third sealing ring 14 is fixedly installed on the outer wall of each disc 13. The third sealing ring 14 can seal the gap between the sleeve 12 and the disc 13 to prevent the slurry from leaking from the gap between the sleeve 12 and the disc 13 when grouting into the casting cavity 19.

[0025] Preferably, in this embodiment, the first connecting pipe 1 and the second connecting pipe 5 are both HDPE pipes, which are made of the same material as the left pipe 16, the right pipe 17 and the new HDPE pipe 18, and can ensure the structural strength of the hot-melt welding points between them.

[0026] The working principle and technical effects of this embodiment are as follows:

[0027] When the HDPE municipal pipeline is cut and replaced, the damaged pipeline is cut off, thereby forming a left pipeline 16 cutting opening and a right pipeline 17 cutting opening, and a new pipeline needs to be flushed and installed between the two to form a continuous pipeline;

[0028] Cut a section of new HDPE pipe 18. The sum of the axial lengths of the new HDPE pipe 18, the first connecting pipe 1, and the second connecting pipe 5 is less than the fixed distance between the cut ends of the left pipe 16 and the cut ends of the right pipe 17. Heat-melt weld the left end of the first connecting pipe 1 to the right end of the new HDPE pipe 18. Then, heat-melt weld the left end of the new HDPE pipe 18 to the cut end of the left pipe 16. During the heat-melt welding process, the new HDPE pipe 18 can be axially moved to provide heat-melt butt extrusion pressure, thereby ensuring the quality of the heat-melt welding between the new HDPE pipe 18 and the left pipe 16. Thereafter, heat-melt weld the right end of the second connecting pipe 5 to the cut end of the right pipe 17. Similarly, the second connecting pipe 5 can be axially moved to provide heat-melt butt extrusion pressure, thereby ensuring the quality of the heat-melt welding between the second connecting pipe 5 and the right pipe 17.

[0029] After the above-mentioned hot-melt welding, there is still a gap of a certain length between the first connecting pipe 1 and the second connecting pipe 5 in the municipal pipeline, and the socket pipe 2 can be rotated to insert the insert pipe 3 into the annular slot 5.1 at the left end of the second connecting pipe 5. As the insert pipe 3 is inserted, the sealing gasket 10 is squeezed between the two annular flanges 8 to form a seal. At the same time, the insert pipe 3 squeezes the spring 6 in the annular slot 5.1. The spring 6 is compressed, and the spring 6 generates a reaction force on the retaining ring 7, so that the right end of the insert pipe 3 and the retaining ring 7 bidirectionally squeeze the first sealing ring 4 in the annular slot 5.1 to form a seal. The double sealing structure can improve the sealing performance of the municipal pipeline after maintenance. Based on the variability of the axial length of the spring 6, it can ensure that when the socket pipe 2 is rotated to squeeze the two annular flanges 8 to squeeze the sealing gasket 10 to form a seal, the first sealing ring 4 in the annular slot 5.1 is also squeezed to form a seal in the annular slot 5.1. This prevents the sealing gasket 10 between the two annular flanges 8 from not being squeezed into place after the insert pipe 3 is inserted into the annular slot 5.1, resulting in an inadequate seal between the two annular flanges 8.

[0030] The two annular flanges 8 are then fixedly connected by a plurality of bolt and nut assemblies 9, thereby improving the structural reliability of the connection between the second connecting pipe 5 and the receiving pipe 2, and preventing the two from moving in the axial direction and causing the sealing structure formed by the first sealing ring 4 in the annular slot 5.1 to loosen;

[0031] It should be noted that after the new HDPE pipe 18 is heat-melted to the left pipe 16 and before the second connecting pipe 5 is heat-melted to the right pipe 17, first ensure that the receiving pipe 2 is threadedly connected to the right end of the first connecting pipe 1 and the sleeve 12 is fitted onto the disc 13 on the outside of the first connecting pipe 1.

[0032] like Figure 3As shown, after the above-mentioned installation structure, the installation of the new HDPE pipe 18 has been completed between the left pipe 16 and the right pipe 17, and the continuity of the municipal pipeline is ensured. In order to ensure the stability of the connection structure between the first connecting pipe 1, the receiving pipe 2, and the second connecting pipe 5, the sleeve 12 is moved to the right so that the right end of the sleeve 12 is sleeved on the disc 13 outside the second connecting pipe 5, and the two ends of the sleeve 12 are respectively sleeved on the two discs 13, thereby forming a casting cavity 19 between the two discs 13 and on the outside of the first connecting pipe 1, the receiving pipe 2, and the second connecting pipe 5. Epoxy resin glue (it can also be cement slurry, PVC glue or polyurethane glue, etc.) is injected into the casting cavity 19 through the grouting port 15 until slurry is returned from the return port 11. The epoxy resin glue in the casting cavity 19 is cured and formed to form a sealing layer, which can improve the strength and sealing of the connection structure between the first connecting pipe 1, the receiving pipe 2 and the second connecting pipe 5.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.

Claims

1. A municipal pipeline maintenance device, comprising a first connecting pipe (1) and a second connecting pipe (5), characterized in that: The outer wall of the right end of the first connecting tube (1) is threadedly connected to a receiving tube (2), and a plug tube (3) is fixedly provided on the right side wall of the receiving tube (2). The left side wall of the second connecting tube (5) is provided with an annular slot (5.1) that is plugged into and matched with the plug tube (3), and a first sealing ring (4) is provided in the annular slot (5.1).

2. The municipal pipeline maintenance device according to claim 1, characterized in that: The right end of the receiving pipe (2) and the left end of the second connecting pipe (5) are both integrally formed with an annular flange (8), and the two annular flanges (8) can be fixedly connected by a plurality of bolt and nut assemblies (9).

3. The municipal pipeline maintenance device according to claim 2, characterized in that: A sealing gasket (10) is fixedly provided on the inner side wall of each annular flange (8).

4. The municipal pipeline maintenance device according to claim 3, characterized in that: A spring (6) and a retaining ring (7) are provided in the annular slot (5.1), and the retaining ring (7) is located between the first sealing ring (4) and the spring (6).

5. The municipal pipeline maintenance device according to claim 1, characterized in that: The first connecting pipe (1) and the second connecting pipe (5) are both HDPE pipes.

6. The municipal pipeline maintenance device according to any one of claims 1 to 4, characterized in that: The outer wall of the middle section of the first connecting pipe (1) and the outer wall of the middle section of the second connecting pipe (5) are both welded with discs (13), an axially movable sleeve (12) is sleeved on the outside of one of the discs (13), a grouting port (15) and a return port (11) are provided on the side wall of the sleeve (12), and when the two ends of the sleeve (12) are respectively sleeved on the two discs (13), a casting cavity (19) can be formed between the two discs (13).

7. The municipal pipeline maintenance device according to claim 6, characterized in that: A third sealing ring (14) is fixedly mounted on the outer wall of each disc (13).

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