A trenchless synchronous pulling device and laying method for municipal pipelines and cables

Abstract

The present application relates to a kind of municipal pipeline and cable non-excavation synchronous traction device and laying method, belong to municipal pipeline and cable technical field, the present application is by in non-excavation drilling process to newborn borehole wall is compacted in time, prevent borehole instability after drilling, to avoid collapse, shrinkage and back drag resistance increase and other problems, by the design of rotary compaction component, while drilling with drill bit assembly, borehole wall is compacted in rotation using drill bit power drive compaction part, the immediate reinforcement of borehole wall is realized, by the rotation of drill bit assembly driving gear part, gear part drives guiding portion annular motion around annular support part, guiding portion is matched with the helical groove in sleeve by protrusion, driving sleeve circumferential rotation, to borehole wall is evenly, continuously compacted in rotation, ensure the compactness and stability of borehole wall, eliminate borehole exposure time, fundamentally solve the problem of insufficient maintenance caused by step construction.

Description

Technical Field

[0001] This invention belongs to the field of municipal pipeline and cable technology, specifically relating to a trenchless synchronous traction device and laying method for municipal pipelines and cables. Background Technology

[0002] In the field of municipal engineering construction, trenchless technology has been applied to minimize excavation damage to existing roads, green spaces, and traffic facilities. Among them, horizontal directional drilling (HDD) is one of the commonly used methods for laying pipelines and cables. The basic process of this technology usually includes two core stages: First, the pilot hole drilling stage, in which a horizontal directional drilling rig drives the drill rod and drill bit to drill a pilot hole according to a preset trajectory; second, the pullback laying stage, in which after the pilot hole is completed, the pipeline or cable to be laid is connected through the drill rod and pulled into the hole together during the pullback process to complete the laying. Existing devices are mainly designed around how to improve drilling accuracy, enhance drill bit guidance, and optimize pullback force. The core technology is to ensure the accurate formation of the drilling trajectory and that the pipeline has sufficient traction force during the pullback process to avoid jamming or damage.

[0003] However, the traditional step-by-step construction method has gradually revealed its inherent limitations in practice. Firstly, because drilling and pipe pullback are carried out in separate steps, in soft, water-bearing, or unevenly shaped soil layers, the already formed pilot hole wall lacks effective support and maintenance during the period from when the drill bit passes through until the pipe is pulled back. This makes it highly susceptible to problems such as local collapse, diameter reduction, or failure of mud wall protection. This not only significantly increases the resistance of subsequent pipe pullback, causing a sharp increase in the load on the traction equipment or even shutdown, but may also lead to surface subsidence due to borehole instability, and in severe cases, render the entire pilot hole unusable. Secondly, even if the borehole wall can remain stable temporarily, the loose gap between the insufficiently compacted borehole wall and the pullback pipe prevents the soil layer above the pipe from forming a tight wrap and support. This may lead to voids in the upper part of the pipe due to soil consolidation and settlement during long-term operation, posing a potential threat to the bearing capacity of the upper road structure and the stability of the pipe itself. Therefore, the inventors proposed a trenchless synchronous traction device and laying method for municipal pipelines and cables, which can strengthen the newly formed borehole wall in real time and actively while drilling, thus improving the quality, efficiency and safety of trenchless laying. Summary of the Invention

[0004] To address the aforementioned problems in the existing technology, this invention provides a trenchless synchronous traction device and laying method for municipal pipelines and cables. This solves the problem that in the existing technology, the pilot hole lacks immediate support and maintenance after drilling and before the pipeline is pulled back, which leads to easy collapse of the hole wall, narrowing of the diameter, or failure of mud wall protection, thereby increasing the pullback resistance, causing high load on the equipment, ground subsidence, or even the failure of the hole.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A trenchless synchronous traction device for municipal pipelines and cables includes a support assembly, a drill bit assembly, a traction assembly, and a rotary compaction assembly. The drill bit assembly and the traction assembly are respectively disposed on both sides of the support assembly. The rotary compaction assembly is disposed on the support assembly between the support assembly and the drill bit assembly and is pulverically connected to the drill bit assembly. The rotary compaction assembly includes an annular support portion, a guide portion rotatably disposed on the annular support portion, a plurality of compaction portions rotatably sleeved on the annular support portion, and a gear portion disposed on one side of the annular support portion. The drill bit assembly is pulverically connected to the gear portion. The drill bit assembly drives the gear portion to rotate. The gear portion drives the guide portion to rotate around the annular support portion. The guide portion drives the compaction portions to rotate circumferentially on the annular support portion. The compaction portions rotary compact the hole wall formed by the drill bit assembly.

[0007] As a further embodiment of the present invention, the number of compaction parts is eight, and the eight compaction parts are evenly distributed on the guide part.

[0008] As a further embodiment of the present invention, the compaction part is a sleeve, the sleeve is provided with a spiral groove, the guide part includes a toothed ring and a plurality of protrusions vertically arranged on the toothed ring, the plurality of protrusions are evenly distributed on the toothed ring, and the protrusions drive the sleeve to rotate circumferentially on the annular support part through the spiral groove.

[0009] As a further embodiment of the present invention, the gear part includes a gear and a rotating shaft disposed at the center of the gear shaft, the rotating shaft being connected to the drill bit assembly for transmission, and the radius of the sleeve being larger than the diameter of the gear.

[0010] As a further embodiment of the present invention, the annular support portion is provided with a limiting block for supporting the sleeve, and the sleeve is rotatably fitted onto the limiting block.

[0011] As a further embodiment of the present invention, the sleeve includes two arc-shaped rings, which are connected as a whole by bolts.

[0012] As a further embodiment of the present invention, an elastic sleeve is fitted onto the sleeve.

[0013] As a further embodiment of the present invention, the annular support portion is provided with a groove, and the toothed ring is disposed within the groove.

[0014] As a further embodiment of the present invention, a rotating wheel for reducing friction is provided between the toothed ring and the groove, the toothed ring and the rotating wheel move synchronously, and the rotating wheel moves along the groove.

[0015] A trenchless method for laying municipal pipelines and cables includes the following steps:

[0016] S1: Connect the pipes or cables to the traction assembly in advance;

[0017] S2: Start the drill bit assembly and drill the pilot hole along the preset trajectory. At the same time, drive the rotary compaction assembly to rotate and compact the newly formed hole wall through the drill bit assembly.

[0018] S3: During the drilling process, the traction component synchronously pulls the pipe or cable into the pilot hole, realizing the simultaneous execution of drilling, compaction and traction;

[0019] S4: Adjust the drilling speed of the drill bit assembly and the rotation speed of the rotary compaction assembly in real time according to geological conditions to optimize the hole wall compaction effect;

[0020] S5: During the traction process, the elastic sleeve on the sleeve adapts to the unevenness of the hole wall to ensure uniform compaction;

[0021] S6: After completing the pilot hole drilling and pipeline or cable laying, retrieve the device and check the integrity of the hole wall.

[0022] The beneficial effects of this invention are as follows:

[0023] This invention prevents post-drilling instability of the borehole wall by simultaneously compacting the newly formed borehole wall during trenchless drilling, thus avoiding problems such as collapse, diameter reduction, and increased pullback resistance. Through the design of the rotary compaction component, the borehole wall is rotated and compacted by the drill bit power while the drill assembly is drilling, achieving immediate reinforcement of the borehole wall. The drill assembly drives the gear unit to rotate, which in turn drives the guide unit to move in a circular motion around the annular support unit. The guide unit, through a protrusion engaging with the spiral groove inside the sleeve, drives the sleeve to rotate circumferentially, thereby uniformly and continuously compacting the borehole wall, ensuring its density and stability, eliminating borehole wall exposure time, and fundamentally solving the problem of insufficient immediate support and maintenance after pilot hole drilling and before pipeline pullback, leading to easy borehole wall collapse, diameter reduction, or failure of mud wall protection, which in turn increases pullback resistance, causes high equipment load, surface subsidence, and even borehole failure. Attached Figure Description

[0024] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the rotary compaction assembly structure of the present invention;

[0027] Figure 3 This is a schematic diagram of the gear section structure of the present invention;

[0028] Figure 4 This is a schematic diagram of the guide section structure of the present invention;

[0029] Figure 5 This is a schematic diagram of the arc-shaped ring structure of the present invention;

[0030] Figure 6 This is a schematic diagram of the limiting block structure of the present invention;

[0031] Figure 7 This is a schematic diagram of the spiral groove structure of the present invention.

[0032] Explanation of key component symbols:

[0033] In the figure: 1. Support assembly; 2. Drill bit assembly; 3. Traction assembly; 4. Rotary compaction assembly; 41. Annular support part; 42. Guide part; 421. Gear ring; 422. Protrusion; 43. Compaction part; 431. Spiral groove; 44. Gear part; 45. Arc ring; 46. Bolt; 47. Limiting block. Detailed Implementation

[0034] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0035] Please see Figure 1 - Figure 7 As shown, this embodiment provides a trenchless synchronous traction device for municipal pipelines and cables, including a support assembly 1, a drill bit assembly 2, a traction assembly 3, and a rotary compaction assembly 4. The drill bit assembly 2 and the traction assembly 3 are respectively disposed on both sides of the support assembly 1. The rotary compaction assembly 4 is disposed on the support assembly 1 between the support assembly 1 and the drill bit assembly 2, and is drivenly connected to the drill bit assembly 2. The rotary compaction assembly 4 includes an annular support part 41, a guide part 42 rotatably disposed on the annular support part 41, a plurality of compaction parts 43 rotatably sleeved on the annular support part 41, and a gear part 44 disposed on one side of the annular support part 41. The drill bit assembly 2 is drivenly connected to the gear part 44. The drill bit assembly 2 drives the gear part 44 to rotate, the gear part 44 drives the guide part 42 to rotate around the annular support part 41, and the guide part 42 drives the compaction parts 43 to rotate circumferentially on the annular support part 41. The compaction parts 43 rotary compact the hole wall formed by the drill bit assembly 2.

[0036] One point that needs further explanation is that drill bit assembly 2 includes the drill bit and components that can control the start and stop of the drill bit and adjust its rotation speed. In the field of horizontal directional drilling, drill bit types, such as roller cone bits and scraper bits, are extremely mature and standardized technologies. Those skilled in the art can easily select and adapt the most suitable drill bit according to geological conditions (rock, clay, sand). Similarly, for traction assembly 3, the method of traction pipe is also a conventional technology in trenchless drilling, and will not be elaborated on here. Support assembly 1 is the structural foundation and force transmission skeleton of the entire device. As shown in the figure, it can be a support block, but it must be strong enough to withstand the huge torque and thrust from the drill bit, as well as the force from traction assembly 3. The tension component connects the drill bit assembly 2, the rotary compaction assembly 4, and the traction assembly 3 into a rigid whole, ensuring that all components work together on a preset axis. The annular support 41 provides a stable base that does not rotate or rotates slowly. The gear 44 serves as the power input end, distributing the rotational power of the drill bit to the compaction system, achieving power source sharing without the need for an additional motor. The guide 42 is a motion conversion mechanism that transmits and distributes the rotational motion of the gear 44 to the circumferentially distributed compaction parts 43. The compaction parts 43 are actuators that convert the motion transmitted from the guide 42 into the rotation of the sleeve, thereby achieving a combined rolling and sliding compaction of the borehole wall. This design ensures uniform distribution of compaction force and continuous operation.

[0037] Currently, in the field of municipal engineering construction, trenchless technologies have been applied to minimize excavation damage to existing roads, green spaces, and traffic facilities. Among these, horizontal directional drilling (WDD) is a commonly used method for laying pipelines and cables. The basic process of this technology typically includes two core stages: first, the pilot hole drilling stage, where a horizontal directional drilling rig drives the drill rod and drill bit to drill a pilot hole according to a preset trajectory; second, the pullback laying stage, where, after the pilot hole is completed, the pipeline or cable to be laid is connected to the drill rod and pulled into the hole during the pullback process, completing the laying. Existing equipment mainly... The design should focus on improving drilling accuracy, enhancing drill bit guidance, and optimizing pullback force. The core technology lies in ensuring the accurate formation of the drilling trajectory and that the pipeline has sufficient traction during pullback to avoid jamming or damage. In existing trenchless laying technology, a step-by-step construction method of "drilling first and then pulling back" is usually adopted. This method has a time interval between the completion of the pilot hole by the drill bit and the pipeline pullback, resulting in a lack of immediate support for the borehole wall. This is especially prone to problems such as collapse and diameter reduction in soft or water-bearing strata, which in turn increases pullback resistance, causes equipment overload, and may even lead to borehole failure or surface subsidence.

[0038] To address the aforementioned issues, this embodiment simultaneously compacts the newly formed borehole wall during trenchless drilling to prevent post-drilling instability and thus avoid problems such as collapse, diameter reduction, and increased pullback resistance. Specifically, through the design of the rotary compaction component 4, the compaction part 43 is driven by the drill bit assembly 2 to rotary compact the borehole wall while drilling, achieving immediate reinforcement of the borehole wall. The drill bit assembly 2 drives the gear part 44 to rotate, which in turn drives the guide part 42 to move in a ring around the annular support part 41. The guide part 42 engages with the spiral groove 431 inside the sleeve through the protrusion 422, driving the sleeve to rotate circumferentially, thereby uniformly and continuously compacting the borehole wall, ensuring the density and stability of the borehole wall, eliminating the exposure time of the borehole wall, and fundamentally solving the problem of insufficient maintenance caused by step-by-step construction.

[0039] It is worth mentioning that, for soft or water-bearing strata, compaction is carried out simultaneously during drilling. However, since compaction is a rotating process, it moves along the excavated hole as the borehole advances. At this time, the compaction section 43 acts like a "trowel" working at high speed on the borehole wall. Under the action of pressure and frictional heat, it forcibly and evenly "smears" and "squeezes" the drilling debris, fine particles in the strata, and solid particles in the mud into the pores on the borehole wall surface. In addition, this design can quickly form a low-permeability, dense and smooth "mud skin" on the borehole wall surface. This mud skin effectively blocks groundwater from seeping into the borehole, preventing the mud wall protection from failing and the borehole wall from being softened by water immersion. This mud skin, which is actively generated by friction, is tightly combined with the compacted soil below, forming a "composite lining" with high structural strength, which is far more stable than simply compacted soil.

[0040] In trenchless construction, the geometry and geological conditions of the borehole wall are complex. If the number of compaction sections 43 is insufficient, continuous compaction without dead zones cannot be achieved. Especially in soft or water-bearing strata, although the borehole wall exposure time is short, insufficient local compaction can still lead to increased pullback resistance or surface subsidence. To address this, in one embodiment, the number of compaction sections 43 is eight, and the eight compaction sections 43 are evenly distributed on the guide section 42. The eight compaction sections 43 cover the entire circumference of the borehole wall in a circular array, avoiding compaction blind spots and achieving continuous and comprehensive rotary compaction. Each compaction section 43 rotates synchronously under the drive of the guide section 42. Through the cooperation of the protrusion 422 and the spiral groove 431, uniform compaction is applied to the borehole wall. The pressure increases the density and stability of the borehole wall. During drilling, multiple compaction sections 43 work simultaneously, shortening the exposure time of the borehole wall and fundamentally eliminating the problem of insufficient maintenance caused by step-by-step construction. In addition, the eight compaction sections 43 are evenly distributed on the circumference, one every 45 degrees, which can provide sufficient coverage density to ensure that every point of the borehole wall can be compacted multiple times, while avoiding excessive density that would lead to structural complexity or increased frictional resistance. Furthermore, too many sections would increase the weight of the component and power consumption, while too few would result in insufficient compaction. The design of the eight compaction sections 43 here is based on a comprehensive consideration of the structure of the rotary compaction component 4, achieving an optimized balance between structural compactness and compaction effect.

[0041] Because the entire device operates within a narrow borehole, its radial dimensions are strictly limited, making it impossible to install multiple independent, complex motors or transmission systems inside the annular support 41 to drive each compaction unit 43. That is, there is only one power input shaft from the drill bit assembly 2. Therefore, how to effectively and synchronously distribute this central power to the circumferentially distributed multiple compaction units 43 requires a specific, efficient, and reliable implementation method to achieve this transmission; otherwise, the entire synchronous rotary compaction process cannot be practically implemented. In one embodiment, the compaction unit... The solid part 43 is a sleeve with a spiral groove 431 inside. The guide part 42 includes a toothed ring 421 and several protrusions 422 vertically arranged on the toothed ring 421. The protrusions 422 are evenly distributed on the toothed ring 421. The protrusions 422 drive the sleeve to rotate circumferentially on the annular support part 41 through the spiral groove 431. First, the guide part 42 is specifically defined here as a toothed ring 421 with vertically arranged protrusions 422. The toothed ring 421 is responsible for receiving power from the gear part 44 and rotating in the same direction as the drill bit. The compaction part 43 is specifically defined as... The sleeve is formed with a spiral groove 431 on its inner wall. The drill bit drives the gear part 44, which drives the gear ring 421 to make a circular motion on the annular support part 41. The protrusion 422 on the gear ring 421 is inserted into the spiral groove 431 of the sleeve. When the gear ring 421 rotates, the protrusion 422 is equivalent to a slider moving in the spiral groove 431. The protrusion 422 generates a continuous thrust on the inclined surface of the spiral groove 431. Since the sleeve is supported by the limiting block 47, it can only rotate and cannot move axially. This thrust will force the sleeve to rotate around its own axis. Furthermore, all sleeves are driven by the protrusion 422 on the same toothed ring 421, ensuring the synchronization of their rotational speeds and thus guaranteeing the uniformity of compaction of the bore wall. The engagement between the protrusion 422 and the spiral groove 431 is continuous, providing a smooth and shock-free rotational torque, making the compaction process continuous and uniform. In extreme cases, if a sleeve encounters great resistance and temporarily gets stuck, the protrusion 422 can generate a small relative displacement within the spiral groove 431 without immediately damaging the entire transmission system, thus providing a certain degree of fault tolerance.

[0042] Since the central axis area of ​​the device must be reserved for the main power transmission path, namely the rotating shaft connecting the drill bit assembly 2 and the gear part 44, and the gear part 44 itself also requires a certain installation space, in order to avoid interference in the mechanical design and ultimately affect the compaction effect, in one embodiment, the gear part 44 includes a gear and a rotating shaft set at the center of the gear shaft. The rotating shaft is connected to the drill bit assembly 2 in a transmission manner. The radius of the sleeve is larger than the diameter of the gear. Firstly, in terms of geometric space, it is ensured that the effective working radius of the sleeve is sufficient to cover and compact the hole wall. The rotation center of the sleeve is on the limiting block 47, and its outer edge is the working surface. The radius of the sleeve is essentially the lever arm of the compaction action. According to the lever principle, under the same torque provided by the transmission system, the outer edge of the sleeve can generate a greater compressive force or a more stable linear velocity against the hole wall, thereby improving the compaction effect and uniformity. In addition, the fact that the radius of the sleeve is larger than the diameter of the gear can avoid interference between the gear part 44 and the hole wall.

[0043] First, the protrusion 422 and spiral groove 431 of the drive sleeve primarily function to transmit torque and rotate the sleeve. It is a transmission mechanism, not a load-bearing mechanism. If it were to simultaneously bear the enormous radial force generated when compacting the borehole wall, it would far exceed its design load. Second, the device advances through underground boreholes in complex environments, encountering hard rocks or uneven strata, causing instantaneous changes in force and impacts on the sleeve. An isolated transmission point cannot handle such complex dynamic loads. To avoid these problems, in one embodiment, a limiting block 47 is provided on the annular support 41 to support the sleeve. The sleeve rotates and is fitted onto the limiting block 47. The limiting block 47 on the annular support 41 provides support for each sleeve. An independent, robust mounting base is provided. The sleeve rotates and is fitted onto the limiting block 47. When the sleeve is working, the radial reaction force from the bore wall is directly transmitted through the sleeve wall to the limiting block 47, and then from the limiting block 47 to the robust annular support 41 and the entire support assembly 1. The structure composed of the protrusion 422 and the spiral groove 431 is only responsible for bearing the tangential force required to drive the sleeve to rotate, and no longer needs to bear the main radial load. With the precise support of the limiting block 47, the rotation center of the sleeve is fixed, avoiding eccentricity and wobbling, thereby ensuring the uniformity and stability of the compaction effect. At the same time, this also greatly reduces the wear of the protrusion 422 and the spiral groove 431, and improves the service life and reliability of the entire transmission system.

[0044] Due to the complexity of geological conditions, the underground soil layers are not uniform, smooth, and ideal cylinders. The borehole walls may be uneven and contain hard objects such as gravel. A purely rigid sleeve cannot adapt to such microscopic unevenness, resulting in a reduced compaction effect and the inability to form a uniform and dense mud cake and composite lining. Furthermore, if the sleeve is a complete and indivisible unit, and the entire rotary compaction assembly 4 is an assembled unit, then the sleeve will be difficult to install onto the limiting block 47. To address this, in one embodiment, the sleeve includes two arc-shaped rings 45, which are connected as a whole by bolts 46. An elastic sleeve is fitted onto the sleeve. By designing the sleeve as two semi-circular arc-shaped rings 45, it can be easily installed onto the limiting block 4. The outer periphery of 7 is then secured with bolts 46 to form a complete rotating body. After wear or damage, bolts 46 can be easily loosened to replace a single arc ring 45 without disassembling the entire complex rotating compaction assembly 4, greatly reducing maintenance costs and time. The elastic sleeve can be made of wear-resistant elastic materials such as rubber and polyurethane, which will deform under pressure. When it encounters a protrusion 422 or a depression on the hole wall, it can produce adaptive deformation to ensure that the compaction surface always keeps in contact with the hole wall, thereby achieving a more uniform and comprehensive compaction effect. When encountering hard obstacles, the elastic sleeve can act as a buffer to absorb impact energy and protect the sleeve, limit block 47, and internal protrusions 422 and spiral grooves 431 from damage.

[0045] Since the gear ring 421 needs to bear all the torque input from the gear section 44 and simultaneously drive multiple circumferentially distributed sleeves, it is itself a heavy-duty, continuously operating component. The sleeves generate a reaction force on the gear ring 421 through the protrusion 422. This force tends to press the gear ring 421 against one side of the groove. The protrusion 422 is subjected to the tangential force of the sleeve spiral groove 431, which generates a force that causes the gear ring 421 to tilt. These forces cause the contact surface between the gear ring 421 and the groove to bear huge pressure. The mud and rock cuttings generated during drilling can easily penetrate into the gap between the gear ring 421 and the groove, forming an abrasive and drastically aggravating wear. To avoid this problem, in one embodiment, a groove is provided on the annular support section 41, and the gear ring 421 is placed in the groove. A rotating wheel for reducing friction is provided between the gear ring 421 and the groove. The gear ring 421 moves synchronously with the rotating wheel, and the rotating wheel moves along the groove. One or more rows of rotating wheels are arranged between the toothed ring 421 and the groove, so that the movement of the toothed ring 421 changes from sliding on the inner wall of the groove to rolling on the rotating wheels. The resistance of rolling friction is much less than that of sliding friction. The drill bit assembly 2 only needs a small force to drive the toothed ring 421 to rotate smoothly, which greatly reduces power consumption and system load. More power is effectively used for hole wall compaction, improving the energy utilization rate of the entire device. The rotating wheels greatly reduce the direct wear of the contact surface between the toothed ring 421 and the groove, extending the service life of key components. Even in the case of mud and sand intrusion, the rotating wheels are more resistant to jamming than planar sliding, ensuring the reliability of the system under harsh working conditions. In addition, the rolling friction of the rotating wheels provides smooth and continuous motion, making the rotation of the toothed ring 421 more uniform, thereby ensuring the uniformity and continuity of the compaction of the hole wall by all compaction parts 43, which is conducive to the formation of a smooth and dense mud cake.

[0046] A trenchless method for laying municipal pipelines and cables includes the following steps:

[0047] S1: Connect the pipe or cable to the traction component 3 in advance. Before construction begins, securely connect the pipe or cable to be laid to the traction component 3 using a special connection mechanism, such as a clamp or lock, to ensure that the pipe or cable will not fall off or loosen during the subsequent traction process, thus laying the foundation for synchronous traction. The traction component 3 is usually designed as an adjustable structure to accommodate pipes or cables of different diameters and to ensure the strength and sealing of the connection points, preventing damage due to excessive resistance during traction.

[0048] S2: Start the drill bit assembly 2 and drill a pilot hole along a preset trajectory. Simultaneously, the drill bit assembly 2 drives the rotary compaction assembly 4 to rotary compact the newly formed hole wall. The drill bit assembly 2 is powered by a horizontal directional drilling rig, driving the drill bit to drill the pilot hole along a preset trajectory, such as a horizontal or curved path. The drill bit assembly 2 selects a suitable drill bit type based on geological conditions. Simultaneously, the power of the drill bit assembly 2 is transmitted to the gear section 44 of the rotary compaction assembly 4 via a rotating shaft. The gear section 44 drives the guide section 42 to move around the annular support section 41. The guide section 42, through a protrusion 422, engages with the spiral groove 431 inside the sleeve, driving the sleeve to rotate circumferentially, thereby uniformly and continuously rotary compacting the hole wall just formed by the drill bit.

[0049] S3: During the drilling process, the traction component 3 synchronously pulls the pipe or cable into the pilot hole, realizing the simultaneous progress of drilling, compaction and traction; while the drill bit component 2 is drilling the pilot hole, the traction component 3 starts to work, synchronously pulling the pipe or cable into the pilot hole at a speed matching the drilling speed. Since the rotating compaction component 4 has strengthened the hole wall in time, the hole wall stability is high and the traction resistance is significantly reduced, avoiding pipe jamming, tearing or equipment overload. This step realizes the synchronization of drilling, compaction and pipe laying, shortens the construction time and reduces the risk of hole wall collapse in traditional step construction.

[0050] S4: The drilling speed of drill bit assembly 2 and the rotation speed of rotary compaction assembly 4 are adjusted in real time according to geological conditions to optimize the borehole wall compaction effect. By monitoring real-time geological conditions, such as soil hardness, water content, or lithological changes, through sensors or manual monitoring, the drilling speed of drill bit assembly 2 and the rotation speed of rotary compaction assembly 4 are dynamically adjusted. For example, in soft or water-bearing strata, the drilling speed is reduced and the compaction speed is increased to enhance the borehole wall compaction effect; in hard strata, the drilling speed is appropriately increased and the compaction speed is maintained to ensure a balance between efficiency and quality. This adaptive adjustment optimizes the compaction process and ensures borehole wall stability under different geological conditions.

[0051] S5: During the traction process, the elastic sleeve on the sleeve adapts to the unevenness of the hole wall to ensure uniform compaction; during the traction process, the elastic sleeve on the outer wall of the sleeve deforms under pressure to maintain close contact with the hole wall, ensuring uniform distribution of pressure and avoiding local insufficient compaction or over-compression.

[0052] S6: After completing the pilot hole drilling and pipeline or cable laying, retrieve the device and check the integrity of the borehole wall. When the pilot hole is drilled to the target position and the pipeline or cable is fully laid, retrieve the device step by step, including the drill bit assembly 2, the rotary compaction assembly 4 and the traction assembly 3. After retrieval, check the integrity of the borehole wall with an endoscope or ground-penetrating radar to confirm that there are no problems such as collapse, narrowing or failure of mud wall protection.

[0053] Working principle and usage process of this invention:

[0054] The drill bit assembly 2, rotary compaction assembly 4, and traction assembly 3 are integrated into one unit by the support assembly 1. During construction, while the drill bit assembly 2 drills the pilot hole, its power drives the gear part 44 of the rotary compaction assembly 4 to rotate through the transmission shaft. The gear part 44 drives the guide part 42 to move around the annular support part 41. The protrusion 422 cooperates with the spiral groove 431 in the sleeve to drive the sleeve to rotate circumferentially, thereby rotary compacting the newly formed hole wall, preventing hole wall collapse and diameter reduction, and reducing pullback resistance. The traction assembly 3 simultaneously pulls the pipeline or cable into the pilot hole, realizing the simultaneous operation of drilling, compaction, and laying.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A trenchless synchronous traction device for municipal pipelines and cables, characterized in that, It includes a support assembly, a drill bit assembly, a traction assembly, and a rotary compaction assembly. The drill bit assembly and the traction assembly are respectively disposed on both sides of the support assembly. The rotary compaction assembly is disposed on the support assembly and is located between the support assembly and the drill bit assembly. The rotary compaction assembly is connected to the drill bit assembly in a driving manner. The rotary compaction assembly includes an annular support, a guide rotatably mounted on the annular support, a plurality of compaction parts rotatably mounted on the annular support, and a gear part mounted on one side of the annular support. The drill bit assembly is connected to the gear part in a transmission manner. The drill bit assembly drives the gear part to rotate. The gear part drives the guide part to rotate around the annular support. The guide part drives the compaction parts to rotate circumferentially on the annular support. The compaction parts rotary compact the hole wall formed by the drill bit assembly. The compaction part is a sleeve, and a spiral groove is provided inside the sleeve. The guide part includes a toothed ring and several protrusions vertically arranged on the toothed ring. The several protrusions are evenly distributed on the toothed ring. The protrusions drive the sleeve to rotate circumferentially in the annular support part through the spiral groove. The gear section includes a gear and a rotating shaft disposed at the gear axis. The rotating shaft is connected to the drill bit assembly for transmission. The radius of the sleeve is larger than the diameter of the gear. The annular support portion is provided with a groove, and the toothed ring is disposed in the groove; A rotating wheel for reducing friction is provided between the toothed ring and the groove. The toothed ring and the rotating wheel move synchronously, and the rotating wheel moves along the groove.

2. The trenchless synchronous traction device for municipal pipelines and cables according to claim 1, characterized in that, The number of compaction sections is eight, and the eight compaction sections are evenly distributed on the guide section.

3. The trenchless synchronous traction device for municipal pipelines and cables according to claim 1, characterized in that, The annular support portion is provided with a limiting block for supporting the sleeve, and the sleeve is rotatably fitted onto the limiting block.

4. The trenchless synchronous traction device for municipal pipelines and cables according to claim 3, characterized in that, The sleeve includes two arc-shaped rings, which are connected as one unit by bolts.

5. A trenchless synchronous traction device for municipal pipelines and cables according to claim 4, characterized in that, An elastic sleeve is fitted onto the sleeve.

6. A method for trenchless laying of municipal pipelines and cables, based on the trenchless synchronous traction device for municipal pipelines and cables as described in any one of claims 1-5, characterized in that, Includes the following steps: S1: Connect the pipes or cables to the traction assembly in advance; S2: Start the drill bit assembly and drill the pilot hole along the preset trajectory. At the same time, drive the rotary compaction assembly to rotate and compact the newly formed hole wall through the drill bit assembly. S3: During the drilling process, the traction component synchronously pulls the pipe or cable into the pilot hole, realizing the simultaneous execution of drilling, compaction and traction; S4: Adjust the drilling speed of the drill bit assembly and the rotation speed of the rotary compaction assembly in real time according to geological conditions to optimize the hole wall compaction effect; S5: During the traction process, the elastic sleeve on the sleeve adapts to the unevenness of the hole wall to ensure uniform compaction; S6: After completing the pilot hole drilling and pipeline or cable laying, retrieve the device and check the integrity of the hole wall.

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