Pipe expander for trenchless replacement of old pipes by pipe splitting

Abstract

The utility model relates to pipe expander technical field discloses a kind of pipe expander of trenchless pipe splitting method replacement old pipeline, including pipe expander main body pipe expander, the pipe expander main body pipe expander is as the basis bearing structure of pipe expander, for integration and installation each function component;Drive system pipe expander, the drive system pipe expander is set in pipe expander main body pipe expander, the drive system pipe expander provides power support for the pipe expansion operation of pipe expander;Male joint pipe expander, the male joint pipe expander is connected in one end of pipe expander, for connecting with external traction etc. Equipment is connected;Head stop pipe expander, the head stop pipe expander is installed in close to male joint pipe expander side.In the utility model, the expansion force outward is generated by cooperation of front cone and rear cone, the operation of expansion or expansion is carried out to old pipeline, the effect of protecting well wall and pipeline is reached, the well wall is easily damaged due to relying on pipe splitting machine tension when traditional pipe splitting method replaces old pipeline, and there is large force on well wall.

Description

Technical Field

[0001] This utility model relates to the field of pipe expander technology, and in particular to a pipe expander for replacing old pipes using a trenchless pipe-breaking method. Background Technology

[0002] In urban pipeline network upgrades and renovations and old pipeline repair projects, trenchless technology has become a key means of pipeline replacement due to its minimal impact on ground traffic and surrounding buildings. As a result, a pipe expander for replacing old pipelines using the trenchless pipe bursting method has emerged. With urban development, the service life of underground pipelines is increasing, and problems such as leakage and blockage are frequent. Trenchless replacement can complete the replacement of old pipelines without damaging the road surface and reducing construction disturbance to residents.

[0003] Currently, in the field of trenchless pipeline replacement, the traditional pipe-breaking method is a commonly used technical approach. It relies on the tensile force generated by the pipe-breaking machine, which drives the pipe-breaking head through structures such as chains and tie rods. During operation, the tensile force of the pipe-breaking machine acts on the pipe-breaking head, and the old pipe is broken and the new pipe is pulled in by the cutting and squeezing of the pipe-breaking head. This technology transmits mechanical tensile force and uses the hard contact of the pipe-breaking head to destroy and remove the old pipe under tensile force, thereby achieving pipeline replacement.

[0004] However, in practical applications, the traditional pipe-breaking method suffers from significant stress on the manhole wall due to its tension-driven nature. When this tension is transmitted to the pipe-breaking head, the manhole wall must withstand additional tensile reaction forces, which can easily lead to cracks and damage to the manhole wall, affecting the structural safety of the underground manhole. Furthermore, under the tension, the replaced pipe is easily stretched, resulting in pipe deformation and misalignment. It is also difficult to accurately control the extent of old pipe breakage, making it challenging to achieve stable and precise construction for replacement of pipes with the same or expanded diameters, thus posing potential risks to subsequent pipeline operation. To address these issues, a pipe expander for replacing old pipes using the trenchless pipe-breaking method is proposed. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a pipe expander for replacing old pipes using a trenchless pipe bursting method, which aims to improve the problem that the pipe expansion operation in the prior art is prone to damage to the well wall.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A pipe expander for replacing old pipes using a trenchless pipe bursting method includes:

[0008] The tube expander body serves as the basic load-bearing structure of the tube expander, and is used to integrate and install various functional components.

[0009] A drive system tube expander is disposed inside the tube expander body and provides power support for the tube expander's tube expanding operation.

[0010] A male connector tube expander, which is connected to one end of a tube expander and is used to connect with external traction or other equipment;

[0011] A stopper expander is installed on the side near the male connector expander to limit and block the position, and to assist in position control during the replacement of new and old pipes.

[0012] The base plate expander is fixedly connected to the main body of the expander, providing a stable installation foundation for the rear expander and related components, and ensuring the stability of the expansion force transmission.

[0013] The rear seat expander is mounted on the base plate expander and cooperates with the front cone expander and the rear cone expander to serve as a support structure for the transmission of expansion force and the movement of components.

[0014] Pin-1 expander, pin-2 expander, and pin-3 expander are used to achieve hinged and rotating connections between components such as the front conical expander and the stop expander, the front conical expander and the rear conical expander, and the rear conical expander and the rear seat expander, so that the front conical expander and the rear conical expander can move relative to each other and cooperate to complete the expansion action.

[0015] The front conical expander is connected to the stop expander and the rear conical expander via a pin. Under the action of the expander in the drive system, it works with the rear conical expander to generate an outward expansion force to expand or open the old pipe.

[0016] The rear cone expander is connected to the front cone expander and the rear seat expander by pins, and works with the front cone expander to form an expansion force that acts on the old pipe.

[0017] The alloy steel toothed tube expander is located at the contact point between the rear cone tube expander and the inner wall of the old pipe, which enhances the force between the tube expander and the inner wall of the old pipe, assists the tube expansion process, and at the same time utilizes the properties of alloy copper to break the inner wall of the old pipe to a certain extent.

[0018] As a further description of the above technical solution:

[0019] The drive system expander is fixedly connected to the inner wall of the expander body, providing power for the expander's expansion operation. It drives the front and rear conical expanders to move relative to each other through a pin connection, generating an expansion force.

[0020] As a further description of the above technical solution:

[0021] The male connector tube expander is used to connect to external traction equipment to transmit power, and cooperates with the stop tube expander to assist in controlling the position of the new tube during pipe replacement;

[0022] As a further description of the above technical solution:

[0023] The front conical tube expander and the rear conical tube expander are connected by pins to achieve relative movement. The resulting expansion force is used to expand the old pipe, which can be adapted to the replacement needs of the same diameter and the expansion diameter.

[0024] As a further description of the above technical solution:

[0025] The alloy steel toothed tube expander is set on the surface of the rear cone tube expander that contacts the inner wall of the old pipe, which enhances the friction and force during the tube expansion process, while reducing damage to the inner wall of the old pipe.

[0026] As a further description of the above technical solution:

[0027] The base plate expander and the rear seat expander together form a stable support structure, ensuring that the force on each component is stable during the expansion process, so that the expansion force can be effectively transmitted to the old pipe.

[0028] As a further description of the above technical solution:

[0029] The pin-1 expander, pin-2 expander, and pin-3 expander possess high strength and wear resistance, ensuring reliable connection and smooth rotation of components such as the front conical expander and rear conical expander under frequent relative movement and stress, thus guaranteeing stable expansion operation.

[0030] This utility model has the following beneficial effects:

[0031] In this invention, the outward expansion force generated by the cooperation of the front and rear cones is used to expand or open the old pipe, achieving the effect of opening the old pipe and thus avoiding damage to the manhole wall. The power to open the old pipe comes from the outward expansion force of the expansion head, rather than the pulling force of the pipe-breaking machine. Therefore, firstly, only a small force is applied to the manhole wall, which will not cause damage to the manhole wall; secondly, it will not pull the replaced pipe together; and thirdly, it can achieve replacement of the same diameter and expanded diameter. This solves the problem that when replacing old pipes using the traditional pipe-breaking method, the large force exerted on the manhole wall due to reliance on the pulling force of the pipe-breaking machine can easily damage the manhole wall and cause deformation of the replaced pipe due to pulling. This invention achieves the effect of protecting the manhole wall and the pipe. Attached Figure Description

[0032] Figure 1 This is a three-dimensional schematic diagram of a pipe expander for replacing old pipes using a trenchless pipe-breaking method proposed in this utility model.

[0033] Legend:

[0034] 1. Body of the tube expander; 2. Drive system; 3. Male connector; 4. Stop; 5. Base plate; 6. Rear seat; 7. Pin 1; 8. Front cone; 9. Pin 2; 10. Rear cone; 11. Alloy steel tooth; 12. Pin 3. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] Reference Figure 1 One embodiment of this utility model provides: a pipe expander for replacing old pipes using a trenchless pipe bursting method, comprising:

[0037] The tube expander body 1 serves as the basic load-bearing structure of the tube expander, used to integrate and install various functional components. It can perform equal-diameter or expanded-diameter replacement. The tube expander body 1 achieves the effect of dispersing the force and enhancing the overall rigidity. It can withstand the high pressure stress during the tube expansion process and ensure that each component maintains a stable relative position during operation.

[0038] Drive system 2 is installed inside the tube expander body 1. Drive system 2 provides power support for the tube expander's expansion operation. It drives the piston to make linear motion through hydraulic oil, thereby driving the front cone 8 and the rear cone 10 to achieve relative motion through the pin connection, so as to achieve the effect of precisely controlling the magnitude and direction of the expansion force.

[0039] Male connector 3 is connected to one end of the tube expander and is used to connect with external traction equipment. Male connector 3 achieves the effect of transmitting traction force and preventing loosening of the connection, ensuring the reliability of power transmission during the pipe replacement process.

[0040] Stop 4 is installed on the side near the male connector 3. It serves to limit and block, and assists in position control during the replacement of the new tube with the old tube. It achieves the effect of accurately controlling the insertion position of the new tube and preventing the front cone 8 from moving too far forward during the tube expansion process.

[0041] The base plate 5 is fixedly connected to the body 1 of the tube expander, providing a stable installation foundation for the rear seat 6 and related components, ensuring the stability of the tube expansion force transmission, and achieving the effect of ensuring the stability of the tube expansion force transmission and facilitating component disassembly and maintenance.

[0042] The rear seat 6 is mounted on the base plate 5 and cooperates with the front cone 8 and the rear cone 10 to serve as a support structure for the transmission of expansion force and the movement of components, thereby dispersing the expansion force and improving structural stability.

[0043] Pin 1 (7), pin 2 (9), and pin 3 (12) are used to achieve hinged and rotating connections between components such as front cone 8 and stop 4, front cone 8 and rear cone 10, and rear cone 10 and rear seat 6, respectively, so that front cone 8 and rear cone 10 can move relative to each other to complete the tube expansion action, ensuring the reliability of the connection and the flexibility of rotation.

[0044] The front cone 8 is connected to the stop head 4 and the rear cone 10 by a pin. Under the action of the drive system 2, it works with the rear cone 10 to generate an outward expansion force to expand or open the old pipe.

[0045] The rear cone 10 is connected to the front cone 8 and the rear seat 6 by a pin. Together with the front cone 8, it forms an expansion force that acts on the old pipe. The front cone 8 and the rear cone 10 work together to generate an outward expansion force, which expands or opens the old pipe. The rear cone has a protruding part that enters the front cone. The front end of this protruding part is inlaid with a wear-resistant cutter head. When the drive system drives the front cone and the rear cone to expand, the protruding part and the wear-resistant cutter head inlaid at the front end extend from the front cone surface, so that the protruding part contacts the inner wall of the old pipe first, until it pierces the inner wall of the old pipe.

[0046] Alloy steel teeth 11 are located at the contact point between the rear cone 10 and the inner wall of the old pipe, enhancing the force between them and assisting the expansion process. Simultaneously, utilizing the properties of alloy copper, they partially burst the inner wall of the old pipe. The alloy steel teeth 11 achieve the effects of assisting the expansion process and reducing damage to the inner wall of the old pipe using the properties of alloy copper. They also facilitate maintenance and reduce operating costs. The drive system 2 is fixedly connected to the inner wall of the expander body 1, providing power for the expansion operation. During operation, the power output from the drive system 2 drives the front cone 8 and the rear cone 10 along a preset transmission trajectory, aided by pins 7, 9, and 3. The articulated connection system consisting of 12 components enables orderly relative movement. The front cone 8 and rear cone 10 are connected by pins to achieve relative movement, generating expansion force. The male connector 3 connects to external traction equipment to transmit power and cooperates with the stop 4 to assist in controlling the position of the new pipe during pipe replacement. The male connector 3 controls the overall direction of travel through traction force. After the old pipe is broken, the male connector 3 is pulled by the external traction equipment. When the male connector 3 is pulled, it moves the tube expander body 1 to the inner wall of the next section of the old pipe to be broken, realizing the movement of the tube expander body 1 within the pipe. The front cone 8 and rear cone 10 are connected by pins to achieve relative movement. The generated expansion force is used to expand the old pipe, adaptable to both same-diameter and expanded-diameter replacement needs. The expansion force generated by the front cone 8 and the rear cone 10 acts evenly on the inner wall of the old pipe, enabling uniform expansion or gradual enlargement of the old pipe diameter to suit different replacement scenarios. Six alloy steel teeth 11 are arranged in a ring array on the surface of the rear cone 10, which contacts the inner wall of the old pipe. This enhances the friction and force during the expansion process while reducing damage to the inner wall of the old pipe. The alloy steel teeth 11 increase the friction with the inner wall of the old pipe, allowing the expansion force to be transferred more efficiently from the expander to the old pipe, while also reducing damage to the inner wall. The scraping and gnawing of the inner wall of the old pipe prevents excessive peeling of old pipe fragments, ensuring the structural integrity of the old pipe after expansion and facilitating the smooth insertion of the new pipe. The base plate 5 and the rear seat 6 together form a stable support structure, ensuring that the force on each component is stable during the expansion process, so that the expansion force can be effectively transmitted to the old pipe. At the same time, it ensures that each component does not tilt or shift when under force, avoiding the dispersion of expansion force and poor expansion effect due to unstable support. Pin 1 7, pin 2 9, and pin 3 12 have high strength and wear resistance, ensuring that the front cone 8, rear cone 10 and other components are reliably connected and rotate smoothly under frequent relative movement and force, ensuring the stable operation of the expansion.

[0047] Working principle: The tube expander body 1 serves as the basic frame, with its tail section used to place new pipes. It can perform equal-diameter or expanded-diameter replacement. It connects to external traction equipment via male connector 3. After the drive system 2 is started, it generates axial thrust through a hydraulic cylinder or electric push rod, pushing the rear cone 10 to move. The front cone 8 and the rear cone 10 are hinged by pin 2 9. The alloy steel teeth 11 on the outer surface of the rear cone 10 cut into the inner wall of the old pipe. There are six alloy steel teeth 11, which are distributed in a ring array on the surface of the rear cone 10. As the expansion force increases, the old pipe is radially expanded and broken. The rear seat 6 is connected to the rear cone 10 by pin 3 12. The base plate 5 A rigid support structure is formed to ensure uniform distribution of expansion force. After the crushing of a section of the pipeline is completed, the drive system 2 reverses its action, and the front cone 8 and the rear cone 10 retract to their initial positions. Then, the male connector 3 is pulled by the external traction equipment. By pulling the male connector 3, the tube expander body 1 moves to the inner wall of the next section of the old pipeline to repeat the crushing action. After the old pipe is completely crushed, the tube expander body 1 drives the new pipeline for installation. This solves the problem that when replacing old pipelines using the traditional pipe cracking method, the large force on the manhole wall caused by the reliance on the pulling force of the pipe cracking machine can easily damage the manhole wall and cause deformation of the replaced pipeline due to pulling. This achieves the effect of protecting the manhole wall and the pipeline.

[0048] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pipe expander for replacing old pipes using a trenchless pipe bursting method, characterized in that, include: The tube expander body (1) serves as the basic load-bearing structure of the tube expander and is used to integrate and install various functional components; The drive system (2) is located inside the tube expander body (1) and provides power support for the tube expander's tube expansion operation. Male connector (3), which is connected to one end of the tube expander and is used to connect with external traction equipment; Stop (4), the stop (4) is installed on the side near the male connector (3) to limit and block, and to assist in position control during the replacement of the new pipe with the old pipe; The base plate (5) is fixedly connected to the body (1) of the tube expander, providing a stable installation base for the rear seat (6) and related components, and ensuring the stability of the tube expansion force transmission; The rear seat (6) is mounted on the base plate (5) and cooperates with the front cone (8) and the rear cone (10) to serve as a support structure for the transmission of expansion force and the movement of components; Pin 1 (7), pin 2 (9), and pin 3 (12) are used to realize the hinge and rotation connection between the front cone (8) and the stop (4), the front cone (8) and the rear cone (10), and the rear cone (10) and the rear seat (6), respectively, so that the front cone (8) and the rear cone (10) can move relative to each other and cooperate to complete the tube expansion action; The front cone (8) is connected to the stop (4) and the rear cone (10) by a pin. Under the action of the drive system (2), it works with the rear cone (10) to generate an outward expansion force to expand or open the old pipe. The rear cone (10) is connected to the front cone (8) and the rear seat (6) by a pin, and works with the front cone (8) to form an expansion force that acts on the old pipe; Alloy steel teeth (11) are set at the part where the rear cone (10) contacts the inner wall of the old pipe, which enhances the force with the inner wall of the old pipe, assists the expansion process, and at the same time utilizes the properties of alloy copper to break the inner wall of the old pipe to a certain extent.

2. The pipe expander for replacing old pipes using the trenchless pipe bursting method according to claim 1, characterized in that: The drive system (2) is fixedly connected to the inner wall of the tube expander body (1) to provide power for the tube expander operation, drive the front cone (8) and the rear cone (10) to move relative to each other through the pin connection, and generate expansion force.

3. The pipe expander for replacing old pipes using the trenchless pipe bursting method according to claim 1, characterized in that: The male connector (3) is used to connect external traction equipment, transmit power, and cooperate with the stop (4) to assist in controlling the position of the new pipe during pipe replacement.

4. The pipe expander for replacing old pipes using the trenchless pipe bursting method according to claim 1, characterized in that: The front cone (8) and the rear cone (10) are connected by pins to achieve relative movement. The resulting expansion force is used to expand the old pipe, which can be adapted to the replacement needs of the same diameter and the expansion diameter.

5. The pipe expander for replacing old pipes using the trenchless pipe bursting method according to claim 1, characterized in that: The alloy steel teeth (11) are set on the surface of the rear cone (10) that contacts the inner wall of the old pipe, which enhances the friction and force during the expansion process and reduces damage to the inner wall of the old pipe.

6. The pipe expander for replacing old pipes using the trenchless pipe bursting method according to claim 1, characterized in that: The base plate (5) and the rear seat (6) together form a stable support structure, ensuring that each component is under stable stress during the expansion process, so that the expansion force can be effectively transmitted to the old pipeline.

7. The pipe expander for replacing old pipes using the trenchless pipe bursting method according to claim 1, characterized in that: The pins 1 (7), 2 (9), and 3 (12) have high strength and wear resistance, ensuring that the front cone (8) and rear cone (10) components are reliably connected and rotate smoothly under frequent relative movement and stress, thus ensuring the stable operation of the tube expansion.

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