Pressure pipe with induction coil and construction and installation method and repairing method thereof

Abstract

The invention provides a pressure pipe with an induction coil, and belongs to the technical field of pipeline connection, the pressure pipe comprises a pipe body, and a socket and a socket which are respectively arranged at two ends of the pipe body, and two adjacent pressure pipes are connected through the socket and the socket which are in butt joint with each other. The pipe is characterized in that the socket head comprises a first fusion part arranged at the end of the pipe body, an induction metal net arranged on the outer side of the circumference of the first fusion part, and a connector connected to the end of the first fusion part, and the birdmouth comprises a second fusion part arranged at the end of the pipe body. The first fusion part and the second fusion part are matched so that the induction metal net can be located between the first fusion part and the second fusion part. The induction metal nets are arranged on the first fusion part and the second fusion part, the induction metal nets are heated through high-frequency alternating current, the first fusion part and the second fusion part are fully fused with the induction metal nets after being fused, the welding time is short, and the sealing performance is good.

Description

Technical Field

[0001] This invention belongs to the technical field of pressure pipelines, trenchless pipe jacking, and underground pipeline connection, and specifically refers to a pressure pipe with an induction coil and its construction, installation, and repair methods. Background Technology

[0002] With the further development of urbanization and the gradual improvement of rural living conditions, the demand for public infrastructure and household water supply and drainage has increased, which is inseparable from construction work such as pipeline installation and maintenance.

[0003] The compound pipe jacking process, situated between horizontal directional drilling and slurry balance pipe jacking, is a comprehensive construction technique integrating "technology + pipe material + working shaft," forming a complete system. It combines the advantages of directional drilling (wide geological adaptability, strong obstacle handling capability, and minimal secondary disasters) with the precise elevation control of pipe jacking, while requiring less space, offering good pipe sealing and strong overall integrity. Its working principle is as follows: A solid-walled short pipe is wound using a self-sealing, self-locking socket joint, replacing the traditional pipe pullback method with a jacking method. A pipe section is installed at the end of the shaft, and the drill rod passes through the center of the pipe, jacking the pipe at its tail end. The tunneling head is responsible for the tunneling torque and face resistance; the remaining power is transmitted to the pipe tail through the rear drive device and force transmission rod, achieving the jacking objective. The tunneling head and pipe are not locked together, serving as a slurry balance relay; the pipe material only bears the jacking friction resistance.

[0004] The current pipe materials used for pipe jacking installation have the following defects: 1. Ordinary PE pipe rings have insufficient stiffness, are prone to deformation during jacking, have poor long-term pressure resistance reliability, and cannot simultaneously bear jacking loads and operating loads.

[0005] 2. PE butt welding is commonly used for on-site connections: 1) The underground space is small, making centering, rounding, heating, and pressure holding difficult; 2) Welding time is long (30-60 minutes / joint), resulting in low efficiency; 3) The joint is a weak area, prone to incomplete welding, slag inclusion, embrittlement of the heat-affected zone, and leakage; 4) Quality is uncontrollable in humid and muddy environments.

[0006] 3. Traditional mechanical joints, flanges, and socket joints: 1) Sealing relies on rubber rings, which are prone to aging, creep, and failure; 1) It cannot restrain the internal pressure expansion of PE pipes, and they are prone to loosening after long-term operation; 2) Once leakage occurs, it is necessary to excavate, enter the well, dismantle and replace the pipe, as the original pipe cannot repair itself. Summary of the Invention

[0007] To address the above problems, the present invention provides a pressure tube with an induction coil to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A pressure tube with an induction coil includes a tube body and a connector and a socket respectively disposed at both ends of the tube body. Two adjacent pressure tubes are connected by interlocking connectors and sockets. The connector includes a first fusion portion disposed at the end of the tube body, an induction metal mesh disposed on the outer circumference of the first fusion portion, and a connector connected to the end of the first fusion portion. The socket includes a second fusion portion disposed at the end of the tube body. The first fusion portion and the second fusion portion cooperate to place the induction metal mesh between them.

[0009] Preferably, an induction metal ring is also provided on the outer circumference of the first fusion part. The induction metal ring is in contact with the induction metal mesh. Since the induction metal mesh heats up slowly, adding an induction metal ring next to it can speed up the heating process.

[0010] Preferably, the pipe body comprises an inner and outer two-layer structure, produced by twin-screw extrusion. The inner layer is a soft PE pipe, and the outer layer is a rigid PE pipe. The inner PE pipe is of drinking water grade and is made of a softer material, while the outer rigid PE pipe bears the top pressure during construction, as well as radial forces and impacts.

[0011] Preferably, the elastic modulus of the outer layer material of the pipe body is greater than 1300 MPa, which is sufficient to ensure that it can withstand the top pressure during construction.

[0012] Preferably, the outer surface of the connector is provided with multiple protrusions, and the connector and the inner wall of the pipe are interference fit. The protrusions can improve the connection strength.

[0013] Preferably, the sensing metal mesh is a ring-shaped mesh structure or a ring-shaped structure with multiple through holes. With this structure, after the first fusion part and the second fusion part melt, they will pass through the sensing metal mesh, which greatly improves their bonding strength and sealing degree.

[0014] Preferably, the induction metal mesh / the induction metal mesh and the induction metal ring are made of a negative thermal expansion material. During the heating stage, the induction metal mesh / the induction metal mesh and the induction metal ring shrink. When the first fusion part and the second fusion part return to the solid state from the molten state, the tube body further tightens the joint.

[0015] Preferably, the outer surface of the first fusion portion has a recess for mounting the sensing metal mesh / the sensing metal mesh and the sensing metal ring, and the outer surface of the sensing metal mesh / the sensing metal mesh and the sensing metal ring does not protrude above the outer surface of the first fusion portion, so as to avoid interference when docking the pressure tube.

[0016] This invention also provides a construction method for connecting two sections of the above-mentioned pressure pipes. The two sections of pressure pipes are connected to the socket through the plug and the socket interface. The connection process is carried out in the working well. The newly connected pressure pipe is still in the working well. At this time, the annular coil that is pre-fitted on the outside of the pressure pipe moves to the induction metal mesh. A high-frequency alternating current is passed through the annular coil. The high-frequency alternating current fitted on the outside of the induction metal mesh heats the induction metal mesh, so that the first fusion part and the second fusion part fuse to achieve a sealed connection. The welding time is short and the sealing performance is good.

[0017] The present invention also provides a repair method using the above-mentioned pressure pipe, which involves locating the two sections of the pressure pipe corresponding to the leak location, and using a high-frequency alternating current to heat the induction metal mesh between the two pressure pipes, so that the first fusion part and the second fusion part fuse together to achieve a sealed connection, without the need to excavate the pipeline.

[0018] Beneficial effects of this invention: This invention incorporates an inductive metal mesh in the first and second fusion sections. The inductive metal mesh is heated by a high-frequency alternating current, causing the first and second fusion sections to melt and fully fuse with the inductive metal mesh. This results in a short welding time and excellent sealing. The pipe body uses a double-layer material and a twin-screw extrusion process. The outer layer is a modified PE pipe with high elastic modulus, capable of withstanding top pressure and radial force, exhibiting strong ring rigidity and resistance to deformation. The inner layer is a PE pipe that meets drinking water standards. The inner and outer layers are fully cross-fused during extrusion to ensure strong adhesion. The inductive metal mesh is positioned in the middle of the pipe body. In case of leakage, it can be repaired using a sheet-like high-frequency alternating current without excavation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the two pressure tubes in Example 1 when they are separated; Figure 2 This is a schematic diagram of the two pressure tubes combined in Example 1; Figure 3 This is a partial enlarged view of the first fusion section 4 in Embodiment 1; Figure 4 This is a partial enlarged view of the first fusion part 4 in Embodiment 2. Detailed Implementation

[0020] The technical solution of the present invention will be described below with reference to the accompanying drawings and embodiments.

[0021] Example 1: Refer to Figure 1-3A pressure tube with an induction coil is disclosed. The pressure tube includes a tube body 1 and a connector 2 and a socket 3 respectively located at both ends of the tube body 1. Two adjacent pressure tubes are connected by interlocking connectors 2 and sockets 3. The connector 2 includes a first fusion portion 4 located at the end of the tube body 1, an induction metal mesh 5 located on the outer circumference of the first fusion portion 4, and a connector 6 connected to the end of the first fusion portion 4. The first fusion portion 4 is part of the tube body 1, and its outer diameter is smaller than that of the tube body 1, forming a machined step. The socket 3 includes a second fusion portion 7 located at the end of the tube body 1. The first fusion portion 4 and the second fusion portion 7 cooperate to position the induction metal mesh 5 between them. The induction metal mesh 5 can be made of ordinary metal material, as long as it can be heated by high-frequency alternating current. The connector 6 is made of ductile iron.

[0022] Preferably, the pipe body 1 includes an inner and outer two-layer structure, produced by twin-screw extrusion. The inner layer is a soft PE pipe, and the outer layer is a rigid PE pipe. The inner PE pipe is of drinking water grade and is made of a softer material, while the outer rigid PE pipe bears the top pressure during construction, as well as the radial force and impact.

[0023] Preferably, the outer layer material of the pipe body 1 is a modified PE material with an elastic modulus greater than 1300 MPa. Sufficient elastic modulus is necessary to ensure that it can withstand the top pressure during construction and to ensure its rigidity.

[0024] Preferably, the outer surface of the connector 6 is provided with multiple protrusions 9, which may be spherical. The connector 6 and the inner wall of the pipe body 1 are interference-fitted, and the protrusions 9 can improve the connection strength. The receiving interface 3 is provided with an installation guide 10 corresponding to the position of the protrusions 9 to facilitate the installation and docking of the pressure pipe.

[0025] Preferably, the sensing metal mesh 5 is an annular mesh structure or an annular structure with multiple through holes. With this structure, after the first fusion part 4 and the second fusion part 7 are melted, they will pass through the sensing metal mesh 5, which greatly improves their bonding strength and sealing degree.

[0026] Preferably, the inductive metal mesh 5 is a negative thermal expansion material. During the heating stage, the inductive metal mesh 5 shrinks. When the first fusion part 4 and the second fusion part 7 return to the solid state from the molten state, the tube body 1 further tightens the joint 6 to improve the connection strength.

[0027] Preferably, the outer surface of the first fusion part 4 is provided with a recess for installing the sensing metal mesh 5, and the outer surface of the sensing metal mesh 5 does not protrude above the outer surface of the first fusion part 4, so as to avoid interference when docking the pressure tube.

[0028] This invention also provides a construction method for connecting two sections of the aforementioned pressure pipe. This construction method employs pipe jacking installation. A jacking device is installed in the working well. The pressure pipe is jacked in the target direction by the jacking device in the working well. After jacking a certain distance, a ring coil is fitted onto the new pressure pipe. The new pressure pipe is then connected to the rear end of the jacked pressure pipe. The two pressure pipe sections are connected to the socket 3 through the socket plug 2. The connection process is carried out in the working well, and the newly connected pressure pipe is still in the working well. At this time, the ring coil, which is pre-fitted on the outside of the pressure pipe, moves to the induction metal mesh 5. A high-frequency alternating current is passed through the ring coil. The high-frequency alternating current fitted on the outside of the induction metal mesh 5 heats the induction metal mesh 5, causing the first fusion part 4 and the second fusion part 7 to fuse, achieving a sealed connection. The welding time is short and the sealing performance is good.

[0029] The present invention also provides a repair method using the above-mentioned pressure pipes. The two pressure pipes corresponding to the leak location are located, and a sheet-like high-frequency alternating ring current is used to heat the induction metal mesh 5 between the two pressure pipes, so that the first fusion part 4 and the second fusion part 7 fuse to achieve a sealed connection. There is no need to dig up the pipeline. This method can locally heat the induction metal mesh 5 and repair the leak location, which greatly reduces the workload of repair.

[0030] This invention incorporates an inductive metal mesh 5 in the first fusion section 4 and the second fusion section 7. The inductive metal mesh 5 is heated by a high-frequency alternating current, causing the first fusion section 4 and the second fusion section 7 to melt and fully fuse with the inductive metal mesh 5. This results in a short welding time and good sealing. The pipe body 1 uses a double-layer material and a twin-screw extrusion process. The outer layer is a modified PE pipe with high elastic modulus, capable of withstanding top pressure and radial force, exhibiting strong ring rigidity and resistance to deformation. The inner layer is a PE pipe conforming to drinking water standards. The inner and outer layers are fully cross-fused during extrusion to ensure bonding strength. The inductive metal mesh 5 is positioned in the middle of the pipe body 1. In case of leakage, it can be repaired using a sheet-like high-frequency alternating current without excavation.

[0031] Example 2: See Figure 4 The difference from Example 1 is as follows: The outer circumference of the first fusion part 4 is also provided with an induction metal ring 8. The induction metal ring 8 is in contact with the induction metal mesh 5. Because the induction metal mesh 5 heats up slowly, the induction metal ring 8 heats up quickly. The heat after the induction metal ring 8 is heated can be transferred to the induction metal mesh 5. Adding an induction metal ring 8 next to it can speed up the heating speed.

[0032] Preferably, the induction metal mesh 5 and the induction metal ring 8 are both negative thermal expansion materials. During the heating stage, the induction metal mesh 5 and the induction metal ring 8 contract. When the first fusion part 4 and the second fusion part 7 return to the solid state from the molten state, the tube body 1 further tightens the joint 6.

[0033] Preferably, the outer surface of the first fusion part 4 is provided with a recess for installing the sensing metal mesh 5 and the sensing metal ring 8. The outer surface of the sensing metal mesh 5 and the sensing metal ring 8 does not protrude above the outer surface of the first fusion part 4, so as to avoid interference when docking the pressure tube.

[0034] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A pressure tube with an induction coil, the pressure tube comprising a tube body and sockets and connectors respectively disposed at both ends of the tube body, wherein two adjacent pressure tubes are connected by interlocking sockets and connectors, characterized in that: The connector includes a first fusion portion disposed at the end of the tube body, a sensing metal mesh disposed on the outer circumference of the first fusion portion, and a connector connected to the end of the first fusion portion. The connector includes a second fusion portion disposed at the end of the tube body. The first fusion portion and the second fusion portion cooperate to place the sensing metal mesh between them.

2. A pressure tube with an induction coil according to claim 1, characterized in that: An induction metal ring is also provided on the outer circumference of the first fusion part, and the induction metal ring is in contact with the induction metal mesh.

3. A pressure tube with an induction coil according to claim 1, characterized in that: The pipe body comprises an inner and outer two-layer structure, with the inner layer being a soft PE pipe and the outer layer being a rigid PE pipe.

4. A pressure tube with an induction coil according to claim 3, characterized in that: The elastic modulus of the outer layer material of the tube is greater than 1300 MPa.

5. A pressure tube with an induction coil according to claim 1, characterized in that: The outer surface of the connector has multiple protrusions.

6. A pressure tube with an induction coil according to claim 1, characterized in that: The inductive metal mesh is a ring-shaped mesh structure or a ring structure with multiple through holes.

7. A pressure tube with an induction coil according to claim 1 or 2, characterized in that: The induction metal mesh / the induction metal mesh and the induction metal ring are made of a negative thermal expansion material.

8. A pressure tube with an induction coil according to claim 1 or 2, characterized in that: The outer surface of the first fusion part has a recess for mounting the sensing metal mesh / the sensing metal mesh and the sensing metal ring, and the outer surface of the sensing metal mesh / the sensing metal mesh and the sensing metal ring does not protrude above the outer surface of the first fusion part.

9. A method for constructing and installing a pressure pipe with an induction coil as described in any one of claims 1-6, comprising connecting two sections of pressure pipe to the socket via the connector, characterized in that, The inductive metal mesh is heated by a ring-shaped high-frequency alternating current wrapped around its outer side, causing the first fusion part and the second fusion part to fuse together and achieve a sealed connection.

10. A method for repairing a pressure tube with an induction coil as described in any one of claims 1-6, characterized in that: The two pressure pipes corresponding to the leak location are located, and a high-frequency alternating current is used to heat the induction metal mesh between the two pressure pipes, so that the first fusion part and the second fusion part fuse together to achieve a sealed connection.

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