Nodular cast iron pipe for trenchless pipeline repair

Abstract

The utility model provides a nodular cast iron pipe for non-excavation pipeline repair, which belongs to the technical field of nodular cast iron pipes and comprises a socket pipe, a double-insertion pipe, a connecting piece and a sealing ring. The two ends of the double-insertion pipe are insertion openings. Bellmouths are arranged at the two ends of the connecting piece; sealing bins are formed in the inner sides of the bell mouths; the sealing ring is arranged in the sealing bin and attached to the outer side wall of the inserting opening. According to the nodular cast iron pipe for non-excavation pipeline repair, the inserting opening and the bellmouths are matched in an inserting mode, and the inserting opening and the bellmouths can be connected through the connecting pieces with the bellmouths at the two ends; through the cooperative use of the double insertion pipes and the connecting pieces, the nodular cast iron pipe can be suitable for the working conditions of different pipeline lengths, and the problems that an existing nodular cast iron pipe is single in pipeline length, high in production difficulty, low in efficiency and high in cost are solved; and in addition, the construction convenience and applicability are improved, and high practical value is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of ductile iron pipes, and more specifically relates to a ductile iron pipe for trenchless pipeline repair. Background Art

[0002] With the intensive development of cities, the importance and safety of underground pipelines are receiving increasing attention. The effectiveness and method of repair for pipelines with long service life or high leakage rates, in particular, have a significant impact on residents' travel, safety, and satisfaction. Underground pipeline repair methods are generally divided into two types: trenchless and excavation. Trenchless repair is preferred due to heavy urban traffic and the difficulty of road maintenance.

[0003] Traditional trenchless repairs are generally classified into non-structural, semi-structural, and structural repairs. Non-structural and semi-structural repairs are only suitable for pipelines that still have load-bearing capacity. Structural repairs are required for pipelines with severe damage.

[0004] To improve the strength of repairs and prevent secondary water pollution, the method of threading ductile iron pipes through old pipelines is becoming increasingly popular. However, in practice, due to the varying operating conditions of pipelines and the varying required pipe lengths, this presents ductile iron manufacturers with a series of challenges, including increased production difficulty, low efficiency, and high costs. Utility Model Content

[0005] The purpose of the utility model is to provide a ductile iron pipe for trenchless pipeline repair, aiming to solve the problems of existing ductile iron pipes such as great production difficulty, low efficiency and high cost due to different required pipeline lengths.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a ductile iron pipe for trenchless pipeline repair, including a socket and spigot pipe, a double spigot, a connecting piece and a sealing ring, the two ends of the socket and spigot pipe are respectively a socket and a spigot; the two ends of the double spigot are both spigots; the two ends of the connecting piece are both sockets; a sealing chamber is opened on the inner side of the socket; the sealing ring is arranged in the sealing chamber and fits into the outer wall of the spigot.

[0007] As another embodiment of the present application, the connecting member includes a main body and sockets provided at both ends of the main body, the inner diameter of the main body is consistent with the inner diameter of the socket, and the outer diameter of the main body is consistent with the outer diameter of the socket.

[0008] As another embodiment of the present application, the connecting member has at least one transition end, and the thickness of the transition end gradually increases from the end surface of the connecting member to the middle portion of the connecting member.

[0009] As another embodiment of the present application, the ends of the sockets are provided with chamfers or rounded corners.

[0010] As another embodiment of the present application, an annular protrusion extending into the chamber is provided on the inner side wall of the sealed chamber.

[0011] As another embodiment of the present application, a self-anchoring compartment is further provided in the socket, and a self-anchoring assembly is movably provided in the self-anchoring compartment; a welding ring protruding outward is provided on the outer wall of the socket, and the welding ring is located on the side of the open end of the self-anchoring assembly away from the socket, and is connected and cooperated with the self-anchoring assembly.

[0012] As another embodiment of the present application, an end surface of the self-anchoring component close to the port is provided with an inclined surface.

[0013] As another embodiment of the present application, the depth of the self-anchoring compartment gradually increases from the end close to the port to the side close to the sealing compartment.

[0014] As another embodiment of the present application, the self-anchoring assembly includes a sliding ring and a flexible strip, and the flexible strip is connected to the outside of the sliding ring and fits against the side wall of the self-anchoring bin.

[0015] As another embodiment of the present application, a limiting groove is provided on the sliding ring, and the inner side of the flexible strip is located in the limiting groove.

[0016] The beneficial effects of the ductile iron pipe for trenchless pipeline repair provided by the utility model are: compared with the existing technology, the ductile iron pipe for trenchless pipeline repair provided by the utility model has a spigot and a socket connection, and the connection between the spigot and the spigot can be made with the help of a connector with a socket at both ends; by arranging the coordinated use of double spigots and connectors, it can be applicable to working conditions with different pipeline lengths, solving the problems of the existing ductile iron pipe having a single pipeline length, and the difficulty, low efficiency and high cost of production; in addition, it also improves the convenience and applicability of construction, and has strong practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A schematic structural diagram of a ductile iron pipe for trenchless pipeline repair provided by an embodiment of the utility model;

[0019] Figure 2A schematic structural diagram of a connector provided in an embodiment of the present utility model;

[0020] Figure 3 This is a schematic structural diagram of a ductile iron pipe for trenchless pipeline repair provided by another embodiment of the utility model.

[0021] In the figure: 1. Socket pipe; 2. Double cannula; 3. Connector; 4. Main body; 5. Sealing chamber; 6. Sealing ring; 7. Self-anchoring chamber; 8. Sliding ring; 9. Flexible strip; 10. Welding ring. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] See also Figures 1 to 3 The ductile iron pipe for trenchless pipeline repair provided by the present invention is now described. The ductile iron pipe for trenchless pipeline repair comprises a spigot / socket pipe 1, a double spigot pipe 2, a connector 3, and a sealing ring 6. The spigot / socket pipe 1 has a socket and a spigot at both ends; the double spigot pipe 2 has spigots at both ends; the connector 3 has a socket at both ends; a sealing chamber 5 is defined on the inner side of each spigot; and the sealing ring 6 is disposed within the sealing chamber 5 and adheres to the outer wall of the spigot.

[0024] The ductile iron pipe for trenchless pipeline repair provided by the utility model has a spigot and a socket for plugging together compared with the prior art, and the spigots can be connected with each other by means of a connector 3 with a socket at both ends; by setting up a double spigot 2 and a connector 3 for use in conjunction with each other, it can be applicable to working conditions with different pipeline lengths, solving the problems of the existing ductile iron pipes with a single pipeline length, great production difficulty, low efficiency and high cost; in addition, it also improves the convenience and applicability of construction, and has strong practical value.

[0025] Optionally, the double cannula 2 can be cut from the spigot 1. Therefore, the length of the double cannula 2 is not limited and can be cut and combined according to actual working conditions. The cut double cannula 2 can also be cut further, and the spigot ends at both ends need to be chamfered or rounded after cutting. The effective length of the spigot 1 can also be cut according to actual working conditions. The spigot ends of the cut spigot 1 are chamfered or rounded.

[0026] Connector 3 is located between two double-barreled pipes 2 or between a double-barreled pipe 2 and a bell-and-spigot pipe 1, connecting them into a single pipeline. Specifically, connector 3 comprises a main body 4 and sockets at either end of the main body 4. The inner diameter of the main body 4 matches the inner diameter of the sockets, and the outer diameter of the main body 4 matches the outer diameter of the sockets. Positioned between adjacent pipe sections, main body 4 can withstand thrust and position the sockets to prevent over-insertion.

[0027] The main body 4 of the connector 3 is located between two adjacent pipes, and the inner diameter of the main body 4 is consistent with the inner diameter of the socket. The inner diameters of the spigot 1, the double cannula 2 and the main body 4 of the connector 3 in the same pipeline are all consistent.

[0028] In addition, the connector 3 has at least one transition end, the thickness of which gradually increases from the end surface of the connector 3 to the middle of the connector 3. The transition surface of the transition end is consistent with the transition surface of the socket of the socket pipe 1.

[0029] In some possible embodiments, see Figure 1 Since the socket pipe 1 and the connector 3 are both cast, the dimensions of their sealing chambers 5 are consistent. The sealing chamber 5 cooperates with the outer wall of the spigot end of the other pipe section, and an annular sealing cavity is provided in the sealing chamber 5. A sealing ring 6 is provided in the sealing cavity. Under the action of extrusion, the inner wall of the sealing ring 6 adheres to the outer wall of the spigot end, and the outer wall adheres to the inner wall of the sealing chamber 5. In addition, an annular protrusion extending into the chamber is provided on the inner wall of the sealing chamber 5; the annular protrusion cooperates with the sealing ring 6. Optionally, the material of the sealing ring 6 is EPDM rubber.

[0030] In some possible embodiments, see Figure 3 A self-anchoring compartment 7 is also provided in the socket, and a self-anchoring assembly is movably provided in the self-anchoring compartment 7; a welding ring 10 protruding outward is provided on the outer wall of the socket, and the welding ring 10 is located on the side of the open end of the self-anchoring assembly away from the socket, and abuts against the self-anchoring assembly.

[0031] The pipes without self-anchoring bins 7 at the sockets are only used in projects with jacking construction; while the pipes with self-anchoring bins 7 at the sockets can be used in projects with jacking construction, as well as in projects with traction or projects with both jacking and traction construction.

[0032] A self-anchor assembly is installed within the self-anchoring compartment 7, which is movable along the length of the pipe. The outer side of the self-anchor assembly fits against the inner sidewall of the self-anchoring compartment 7, while the inner side of the self-anchor assembly fits against the outer sidewall of the socket end. A welding ring 10 on the outer sidewall of the socket enters the socket from the open end and moves rearward with the socket until it passes through the self-anchoring assembly. There, the welding ring 10 abuts the rear side of the self-anchoring assembly and is restrained within the self-anchoring compartment 7 by the self-anchoring assembly.

[0033] In order to facilitate the welding ring 10 to pass through the inner side of the self-anchor assembly, the end surface of the self-anchor assembly close to the port is provided with an inclined surface. A gap is formed between the inclined surface and the socket, and the gap gradually decreases from the port to the rear.

[0034] The depth of the self-anchoring chamber 7 gradually increases from the end close to the port to the side close to the sealing chamber 5. There is an inclined surface on the side close to the port of the self-anchoring chamber 7; when the self-anchoring assembly is limited by the welding ring 10, the front end of the self-anchoring assembly is pressed against the inclined surface.

[0035] The self-anchoring assembly includes a sliding ring 8 and a flexible strip 9. The flexible strip 9 is attached to the outside of the sliding ring 8 and engages with the sidewalls of the self-anchoring compartment 7. Both the sliding ring 8 and the flexible strip 9 are confined within the self-anchoring compartment 7, with the flexible strip 9 resting against the sidewalls of the compartment 7. Specifically, a T-shaped retaining groove is defined in the middle of the sliding ring 8. The flexible strip 9 is annular, with its inner side fixed within the retaining groove and moving with the sliding ring 8.

[0036] Example 1 is a project for jacking construction, and the construction process includes:

[0037] a. Inspect the pipeline to be repaired to confirm its diameter, length, deflection, damage and other information;

[0038] b. Treat the inner wall of the pipeline to be repaired, and remove obstacles such as bosses, sediments, tree roots, and misaligned interfaces that may affect the insertion of the pipeline;

[0039] c. Determine the new pipeline diameter, interface type, length, etc. based on the diameter, length, deflection and other working conditions of the pipeline to be repaired;

[0040] d. The ductile iron pipe manufacturer centrifugally casts the socket and spigot pipe in accordance with GBT 13295 and completes routine operations such as annealing and anti-corrosion on the production line. At the same time, the manufacturer completes the production of the connector in accordance with the requirements;

[0041] e. According to the working conditions of the pipeline to be repaired, cut and grind the socket pipe to the required length;

[0042] f. Install the sealing rubber ring in the socket of the bell-and-spigot pipe 1 and the connector 3, then connect the connector 3, the bell-and-spigot pipe 1, and the double cannula 2 to form a new pipeline, and finally push the new pipeline into the pipeline to be repaired by means of jacking;

[0043] g. Inject grout between the pipeline to be repaired and the new pipeline, and inspect and accept the new pipeline.

[0044] Example 2 is for a project using traction construction or a project using traction plus jacking construction. The construction process includes:

[0045] a. Inspect the pipeline to be repaired to confirm its diameter, length, deflection, damage and other information;

[0046] b. Treat the inner wall of the pipeline to be repaired, and remove obstacles such as bosses, sediments, tree roots, and misaligned interfaces that may affect the insertion of the pipeline;

[0047] c. Determine the new pipeline diameter, interface type, length, etc. based on the diameter, length, deflection and other working conditions of the pipeline to be repaired;

[0048] d. The ductile iron pipe manufacturer centrifugally casts the socket and spigot pipe in accordance with GBT 13295 and completes routine operations such as annealing and anti-corrosion on the production line. At the same time, the manufacturer completes the production of the connector in accordance with the requirements;

[0049] e. According to the working conditions of the pipeline to be repaired, the socket pipe 1 is cut and polished to the required length, and a welding ring 10 is performed at the socket end;

[0050] f. Install the sealing rubber ring and self-anchor assembly into the socket of the spigot 1 and the connector 3. Then connect the connector 3, spigot 1, and double cannula 2 to form a new pipeline. Finally, insert the new pipeline into the pipeline to be repaired by pulling or pushing and pulling.

[0051] g. Inject grout between the pipeline to be repaired and the new pipeline, and inspect and accept the new pipeline.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. Ductile iron pipe for trenchless pipeline repair, characterized in that: The invention comprises a socket-and-spigot pipe (1), a double-tube (2), a connector (3) and a sealing ring (6), wherein the two ends of the socket-and-spigot pipe (1) are respectively a socket and a spigot; the two ends of the double-tube (2) are both spigots; the two ends of the connector (3) are both sockets; a sealing chamber (5) is provided on the inner side of each of the sockets; and the sealing ring (6) is arranged in the sealing chamber (5) and is attached to the outer wall of the spigot.

2. The ductile iron pipe for trenchless pipeline repair according to claim 1, characterized in that: The connecting member (3) comprises a main body (4) and sockets provided at both ends of the main body (4); the inner diameter of the main body (4) is consistent with the inner diameter of the socket, and the outer diameter of the main body (4) is consistent with the outer diameter of the socket.

3. The ductile iron pipe for trenchless pipeline repair according to claim 2, characterized in that: The connecting member (3) has at least one transition end, and the thickness of the transition end gradually increases from the end surface of the connecting member (3) to the middle of the connecting member (3).

4. The ductile iron pipe for trenchless pipeline repair according to claim 1, characterized in that: The ends of the sockets are all provided with chamfers or rounded corners.

5. The ductile iron pipe for trenchless pipeline repair according to claim 1, characterized in that: An annular protrusion extending into the chamber is provided on the inner side wall of the sealing chamber (5).

6. The ductile iron pipe for trenchless pipeline repair according to claim 1, characterized in that: A self-anchoring compartment (7) is also provided in the socket, and a self-anchoring assembly is provided in the self-anchoring compartment (7); a welding ring (10) protruding outward is provided on the outer side wall of the socket, and the welding ring (10) is located on the side of the self-anchoring assembly away from the open end of the socket, and is connected and matched with the self-anchoring assembly.

7. The ductile iron pipe for trenchless pipeline repair according to claim 6, characterized in that: An end surface of the self-anchoring component close to the port is provided with an inclined surface.

8. The ductile iron pipe for trenchless pipeline repair according to claim 7, characterized in that: The depth of the self-anchoring chamber (7) gradually increases from the end close to the port to the side close to the sealing chamber (5).

9. The ductile iron pipe for trenchless pipeline repair according to claim 8, characterized in that: The self-anchoring assembly comprises a sliding ring (8) and a flexible strip (9), wherein the flexible strip (9) is connected to the outside of the sliding ring (8) and fits with the side wall of the self-anchoring bin (7).

10. The ductile iron pipe for trenchless pipeline repair according to claim 9, characterized in that: A limiting groove is provided on the sliding ring (8), and the inner side of the flexible strip (9) is located in the limiting groove.

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