PE drainage pipe front pulling and rear jacking broken pipe replacement system

Abstract

The application relates to the technical field of pipe replacement by the pipe cracking method, in particular to a PE drainage pipe replacement system with front pulling, rear top pushing and pipe cracking. The replacement system comprises a traction mechanism, a pipe expander and a pushing mechanism. The traction mechanism comprises a directional drilling machine, which is configured to drive the drill rod of the directional drilling machine to rotate and axially move. The head of the pipe expander is connected with the drill rod of the directional drilling machine, and the outer periphery of the pipe expander is provided with a cutting knife, and the tail of the pipe expander is used for connecting a new pipe. The pushing mechanism is connected with one end of the new pipe away from the pipe expander, and is used for pushing the new pipe to advance along the original pipe. The PE drainage pipe replacement system with front pulling, rear top pushing and pipe cracking actively cuts, which greatly reduces the pipe breaking resistance. In the deep soil covering and long distance repair scene, the construction stagnation caused by the too large resistance of the earth surface is avoided, the drill head does not need to be taken out by trenching, the construction efficiency is improved, and the damage to the ground environment is reduced.

Description

Technical Field

[0001] This application relates to the field of pipe replacement technology using the pipe cracking method, and more specifically, to a system for replacing cracked PE drainage pipes by pulling in front and pushing back. Background Technology

[0002] In the field of municipal pipeline renovation projects, short pipe replacement is a commonly used trenchless repair technique. The traditional short pipe replacement process mainly relies on jacks installed at the rear to continuously apply axial jacking force to the new pipe. This jacking force is transmitted through the pipe to the pipe-breaking drill bit at the front end. The drill bit's squeezing force breaks the original pipe, and the new pipe is simultaneously pushed into the position of the original pipe, thereby realizing the pipeline renovation.

[0003] However, this traditional process has shortcomings in practical applications, such as insufficient ability to handle complex working conditions and low construction efficiency. When encountering areas with large overburden depths or long-distance pipeline repair projects, the soil pressure around the original pipeline increases significantly, causing a sharp rise in the resistance on the face of the pipe-breaking drill bit. At this time, the jacks behind the drill bit need to provide greater jacking force to push the drill bit forward, but excessive jacking force can easily cause the following problems: when the jacking force exceeds the compressive strength of the new pipeline, it can cause irreversible damage such as bending and cracking of the pipeline, resulting in pipeline damage; when the resistance is too great and the drill bit cannot continue to advance, construction is often interrupted, and it is necessary to excavate the ground to remove the drill bit for inspection or replacement, which contradicts the original intention of trenchless technology and greatly increases construction costs and time. Utility Model Content

[0004] In view of this, this application provides a PE drainage pipe front-pull and rear-pull broken pipe replacement system, which aims to improve the problems of high pipe breakage resistance, slow construction process and great damage to the ground environment of the existing broken pipe replacement system.

[0005] This application provides a PE drainage pipe front-pull and rear-pull crack replacement system, including:

[0006] A traction mechanism, including a directional drilling rig, the directional drilling rig being configured to drive the drill rod of the directional drilling rig to rotate and move axially;

[0007] A pipe expander head, the head of which is connected to the drill rod of the directional drilling rig, and the outer periphery of the pipe expander head is equipped with a cutting blade, the tail of which is used to connect a new pipe; and

[0008] The pushing mechanism is connected to the end of the new pipe away from the tube expander head, and is used to push the new pipe forward along the original pipe.

[0009] Preferably, a connector is provided between the tail end of the tube expander head and the new pipe, one end of the connector is rotatably connected to the tail end of the tube expander head, and the other end of the connector is connected to the new pipe through a detachable fastener.

[0010] Preferably, the pushing mechanism includes a pushing device and a hydraulic power device, wherein the hydraulic power device pushes the new pipeline through the pushing device.

[0011] Preferably, the pushing device is a jack, and the hydraulic power device is a hydraulic pump.

[0012] Preferably, a pad is provided between the end face of the new pipe away from the tube expander head and the piston rod end of the jack.

[0013] Compared with existing technologies, the PE drainage pipe front-pull and rear-push broken pipe replacement system provided in this application achieves at least the following beneficial effects:

[0014] The PE drainage pipe front-pull and rear-push broken pipe replacement system provided in this application has a cutting blade on the outer periphery of the pipe expander head. During the traction process, the cutting blade can pre-cut the inner wall of the original pipe to reduce the pushing resistance. The directional drilling rig drives its drill rod to rotate and move axially, causing the pipe expander head to rotate synchronously during movement. The cutting blade actively cuts the inner wall of the original pipe, transforming "passive compression" into "active cutting," significantly reducing pipe breaking resistance. Furthermore, the drill rod powerfully pulls the pipe expander head forward, forming a two-way combined force with the jacking force of the rear pushing mechanism. This "front pull and rear push" pipe breaking process can significantly reduce the original pipe breaking resistance. Even when facing high-strength materials or complex geological conditions, construction can be carried out without interruption, improving pipeline replacement efficiency and construction reliability. It is especially suitable for the overall replacement and repair of PE drainage pipelines. Compared with the traditional process of relying solely on jacking force to break the pipe, this PE drainage pipeline front pull and rear push pipe breaking replacement system actively cuts, significantly reducing pipe breaking resistance. In repair scenarios with deep overburden and long distances, it avoids construction stagnation caused by excessive resistance on the soil surface, eliminates the need for trenching to retrieve the drill bit, improves construction efficiency, and reduces damage to the ground environment.

[0015] Of course, any product implementing this application need not specifically need to achieve all of the technical effects described above at the same time.

[0016] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present application and, together with their description, serve to explain the principles of the present application.

[0018] Figure 1 The figure shown is a reference diagram of the usage status of the PE drainage pipe front-pull and rear-pull broken pipe replacement system provided in the embodiment of this application;

[0019] Figure 2The diagram shown is a schematic representation of the connection structure between the tube expander head, the pusher head, and the new pipe in an embodiment of this application.

[0020] Figure 3 The diagram shown is a structural schematic of the traction mechanism in an embodiment of this application;

[0021] Figure 4 The diagram shown is a construction flowchart of the PE drainage pipe front-pull and rear-pull cracked pipe replacement system provided in this application embodiment.

[0022] Explanation of reference numerals in the attached figures:

[0023] 10-Original pipeline, 20-New pipeline, 30-Receiving well, 40-Working well, 100-Traction mechanism, 101-Guide rod, 110-Directional drilling rig, 111-Drill rod, 200-Expanding head, 210-Cutting blade, 310-Pushing device, 311-Jack, 312-Plate, 320-Hydraulic power unit, 321-Hydraulic pump, 400-Connecting parts. Detailed Implementation

[0024] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0025] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0026] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0027] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0028] Various modifications and variations can be made to this application without departing from its spirit or scope, which will be apparent to those skilled in the art. Therefore, this application is intended to cover modifications and variations falling within the scope of the corresponding claims (the claimed technical solutions) and their equivalents. It should be noted that the implementation methods provided in the embodiments of this application can be combined with each other without contradiction.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0030] Figure 1 The diagram shown is a reference image of the PE drainage pipe front-pull and rear-pull crack replacement system provided in this application embodiment, indicating its usage status. Figure 2 The diagram shown is a schematic representation of the connection structure between the tube expander head, the pusher head, and the new pipe in an embodiment of this application. Figure 3 The diagram shown is a structural schematic of the traction mechanism in an embodiment of this application.

[0031] Please refer to Figures 1 to 3 This application provides a PE drainage pipe front-pull and rear-push broken pipe replacement system, including a traction mechanism 100, a pipe expander head 200 and a pushing mechanism 300.

[0032] The traction mechanism 100 includes a directional drilling rig 110, which is configured to drive the drill rod 111 to rotate and move axially.

[0033] The head of the tube expander head 200 is connected to the drill rod 111, and the outer periphery of the tube expander head 200 is provided with a cutting blade 210. The tail of the tube expander head 200 is used to connect the new pipe 20.

[0034] The pushing mechanism 300 is connected to the end of the new pipe 20 away from the tube expander head 200, and is used to push the new pipe 20 forward along the original pipe 10.

[0035] It should be understood that the directional drilling rig 110 is configured to drive the drill rod 111 to rotate and move axially. The head of the tube expander head 200 is connected to the drill rod 111. The directional drilling rig can indirectly drive the tube expander head 200 to rotate and move by driving the drill rod 111 to rotate and move. In specific implementation, the directional drilling rig 110 is set in front of the target location of the pipeline and is located on the ground. Its drill rod 111 is drilled obliquely from the ground into the ground until the end reaches the underground depth where the original pipeline 10 is located. The end of the drill rod 111 can be connected to the tube expander head 200 through the guide rod 101. The guide rod 101 passes through the original pipeline 10, and the end section of the drill rod 111 is located in the receiving well 30, which facilitates the connection and installation of the drill rod 111 and the guide rod 101.

[0036] In practice, the pushing mechanism 300 is located on one side of the working well 20, and the pushing mechanism 300 (or the pushing device 310 of the pushing mechanism 300) can be installed in the working well.

[0037] The PE drainage pipe front-pull and rear-push broken pipe replacement system provided in this embodiment has a cutting blade 210 on the outer periphery of the pipe expander head 200. During the traction process, the cutting blade 210 can pre-cut the inner wall of the original pipe 10 to reduce the pushing resistance. The directional drilling rig 110 drives its drill rod 111 to rotate and move axially, causing the tube expander head 200 to rotate synchronously during movement. The cutting blade 210 actively cuts the inner wall of the original pipe 10, transforming "passive compression" into "active cutting," significantly reducing pipe breaking resistance. Furthermore, the drill rod 111 forcefully pulls the tube expander head 200 forward, forming a two-way combined force with the jacking force of the rear pushing mechanism 300. This "front pull and rear push" pipe breaking process can significantly reduce the breaking resistance of the original pipe 10. Even when facing high-strength materials or complex geological conditions, construction can be carried out without interruption, improving pipeline replacement efficiency and construction reliability. It is especially suitable for the overall replacement and repair of PE drainage pipelines. Compared with the traditional process that relies solely on jacking force to break the pipe, this embodiment actively cuts, significantly reducing pipe breaking resistance. In deep overburden and long-distance repair scenarios, it avoids construction stagnation caused by excessive resistance on the soil surface, eliminates the need for trenching to retrieve the drill bit, improves construction efficiency, and reduces damage to the ground environment.

[0038] See also Figures 1 to 3 In some embodiments, a connector 400 is provided between the tail of the tube expander head 200 and the new pipe 20. One end of the connector 400 is rotatably connected to the tail of the tube expander head 200, and the other end of the connector 400 is connected to the new pipe 20 through a detachable fastener.

[0039] In practice, the connector 400 and the tail of the tube expander head 200 can be rotatably connected by a rotating bearing, and the connector 400 and the new pipe 20 can be detachably fixedly connected by a flange, bolt or clip.

[0040] In this embodiment, the connector 400 is rotatably connected to the tail of the tube expander head 200, allowing the tube expander head 200 to rotate freely under the traction of the directional drilling rig 110, while the new pipe 20 does not need to rotate with it. The connector 400 and the new pipe 20 are connected by detachable fasteners (such as flanges, clips, etc.), which can ensure sufficient connection strength to transmit thrust, and can be quickly disassembled when construction is completed or equipment fails, which is convenient for maintenance and replacement of parts.

[0041] In some embodiments, the actuating mechanism 300 includes an actuating device 310 and a hydraulic power device 320, the hydraulic power device 320 actuating the new pipe 20 via the actuating device 310.

[0042] Because the hydraulic power unit 320 is characterized by rapid response and precise control, it can adjust the thrust and speed of the pushing device 310 in real time according to the actual resistance changes during construction. For example, when encountering increased local resistance, the hydraulic system can automatically increase the thrust; when approaching weak points such as pipe joints, the thrust can be reduced to prevent damage to the new pipe 20. Therefore, in this embodiment, by using the hydraulic power unit 320 to push the new pipe 20 through the pushing device 310, the flexibility and controllability of the construction process can be improved, and the risk of construction accidents caused by improper operation can be reduced.

[0043] In some embodiments, the pushing device 310 is a jack 311, and the hydraulic power device 320 is a hydraulic pump 321; a pad 312 is provided between the end face of the new pipe 20 away from the tube expander head and the piston rod end of the jack 311.

[0044] In this embodiment, a jack 311 is used as a pushing device 310, and a hydraulic pump 321 is used as a hydraulic power device 320. Utilizing the high power density characteristics of hydraulic transmission, the hydraulic pump 321 can precisely adjust the output pressure to drive the jack 311 to provide a stable, continuous and adjustable thrust.

[0045] In some embodiments, a pad 312 is provided between the end face of the new pipe 20 away from the tube expander head 200 and the piston rod end of the jack 311.

[0046] In this embodiment, a pad 312 is installed on the end face of the new pipe 20 and the piston rod end of the jack 311. This allows the concentrated pushing force of the jack 311 to be evenly distributed to the end face of the pipe, preventing localized stress concentration from causing damage such as indentations or cracks to the new pipe 20. This is especially suitable for drainage pipes made of relatively soft materials such as PE, effectively protecting the pipe structure, extending its service life, and reducing the cost and time wasted on rework due to pipe damage. This ensures the smooth implementation of the "front pull, rear push" pipe breaking process.

[0047] Figure 4 The diagram shown is a construction flowchart of the PE drainage pipe front-pull and rear-pull cracked pipe replacement system provided in this application embodiment.

[0048] Combination Figure 4 The construction process for this PE drainage pipe front-pull and rear-pull crack replacement system is as follows:

[0049] Blocking and diversion: Blocking and diverting the original pipeline system 10 to prevent the medium (such as water) in the pipeline from affecting the construction, and to ensure construction safety and environmental cleanliness.

[0050] Equipment Installation: 1) Installation of Directional Drilling Rig 110: Install the directional drilling rig 110 at a suitable location on the construction site. As the core equipment of the traction mechanism 100, it provides power and a guiding foundation for subsequent directional drilling and traction of the pipe expander head 200. 2) Installation of Jack 311: Install the pushing device 310 (jack 311) of the pushing mechanism 300 in the working well 20. Together with the hydraulic power unit 320, it will be used to apply thrust to the new pipe 20 and push the pipe expander head 200 forward.

[0051] Directional drilling: Directional drilling is carried out using directional drilling rig 110. The drilling direction is guided by drill rod 111 (guide rod 101) to open up a path for the pipe expander head 200 and ensure that subsequent construction is carried out along the original pipeline 10.

[0052] Head connection: Connect the drill rod 111 (guide rod 101) of the directional drilling rig 110 to the head of the tube expander head 200, so that the directional drilling rig 110 can pull the tube expander head 200 through the drill rod 111; at the same time, connect the new pipe 20 (pipe material) to the tail of the tube expander head 200 to build a construction connection system of "directional drilling rig 110-drill rod 111-tube expander head 200-new pipe 20".

[0053] Equipment commissioning: Commission the directional drilling rig 110, hydraulic power unit 320 (and push device 310), pipe expander head 200 and new pipeline 20, etc., check the operating status of each piece of equipment and the firmness of the connection, test whether the thrust and traction output is normal, and ensure the smooth progress of construction.

[0054] Pipe breaking and jacking: The directional drilling rig 110 is started to provide traction and torque. The directional drilling rig 110 starts the "rotation + pullback" mode. The cutting blade 210 spirally cuts the inner wall of the original pipe 10. At the same time, the pushing device 310 (jack 311) uses the hydraulic power device 320 to apply a thrust to the new pipe 20, forming a "front pull and rear push" combined force. The outer peripheral cutting blade 210 of the pipe expander head 200 works to cut and break the original pipe 10, and carries the new pipe 20 along the path of the original pipe 10 to realize the replacement of the original pipe 10.

[0055] End treatment: After the new pipe 20 is jacked into place, both ends of the new pipe 20 are treated, such as connecting and sealing with the original pipeline system, to ensure that the pipeline system is restored to normal use function and the construction is completed.

[0056] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. A system for replacing broken PE drainage pipes by pulling forward and pushing backward, characterized in that, include: A traction mechanism, including a directional drilling rig, the directional drilling rig being configured to drive the drill rod of the directional drilling rig to rotate and move axially; The tube expander head has its head connected to the drill rod of the directional drilling rig, and a cutting blade is provided on the outer periphery of the tube expander head. Its tail is used to connect to a new pipe. The tube expander head also includes a pushing mechanism connected to the end of the new pipe away from the tube expander head, which is used to push the new pipe forward along the original pipe.

2. The PE drainage pipe front-pull and rear-push broken pipe replacement system as described in claim 1, characterized in that, A connector is provided between the tail end of the tube expander head and the new pipe. One end of the connector is rotatably connected to the tail end of the tube expander head, and the other end of the connector is connected to the new pipe through a detachable fastener.

3. The PE drainage pipe front-pull and rear-push broken pipe replacement system as described in claim 1, characterized in that, The pushing mechanism includes a pushing device and a hydraulic power device, which pushes the new pipeline through the pushing device.

4. The PE drainage pipe front-pull and rear-push broken pipe replacement system as described in claim 3, characterized in that, The pushing device is a jack, and the hydraulic power device is a hydraulic pump.

5. The PE drainage pipe front-pull and rear-push broken pipe replacement system as described in claim 1, characterized in that, A pad is provided between the end face of the new pipe away from the tube expander head and the piston rod end of the jack.

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