Construction equipment and construction method for trenchless pipe pre-treatment

Abstract

The present application relates to a kind of pipeline trenchless pretreatment construction equipment and construction method, equipment is by ground power-control module, underground support-guide module, double drill rod and replaceable drill bit module, fluid supply-discharge module composition;Among them, double drill rod can complete jacking and pull back by once stringing, realize soil loosening, obstacle cutting, high pressure water / gas combined flushing and cement slurry centrifugal spraying by replaceable drill bit in turn.The ground bidirectional hydraulic jack and turntable provide axial force and torque, underground adjustable fixed support frame and sliding support ensure that drill rod is centered;Camera real-time monitoring, personnel is not needed in pipeline in whole process.Construction method includes jacking loosening, pull back flushing, spraying reinforcement and reinspection four steps, can be continuously operated under the condition of DN300-DN1200, inspection well mouth 0.6-1 m, single section 100 m uses time ≤8 h, significantly improve efficiency, reduce cost and guarantee safety, realize once continuous completion loosening, cutting, flushing, spraying whole process, personnel is not needed downhole.

Description

Technical Field

[0001] This invention relates to the field of trenchless pipeline pretreatment, specifically to a construction equipment and method for trenchless pipeline pretreatment. Background Technology

[0002] With the acceleration of urbanization, underground pipeline networks are becoming increasingly complex, making pipeline maintenance and repair a crucial aspect of urban management. Traditional pipeline repair methods often require road excavation, which not only disrupts traffic and residents' lives but also causes significant environmental pollution and high repair costs. Therefore, trenchless pipeline repair technology has emerged and is gradually becoming the mainstream technology in the field. Trenchless repair technology mainly includes overall repair technology and partial repair technology, offering significant advantages such as minimal environmental impact and rapid construction speed.

[0003] In trenchless pipeline repair, pipeline pretreatment is a crucial step. The quality of pretreatment directly impacts the smooth progress and effectiveness of subsequent repair work. Pipeline pretreatment typically includes steps such as pipeline sealing and drainage, pipeline dredging and flushing, pipeline mortar spraying, and pipeline soil grouting. Among these, pipeline dredging and flushing is a key process for removing deposits, debris, and blockages from the pipeline's inner wall. It is essential for ensuring the pipeline's inner wall is clean and free of sharp burrs and protrusions, providing a solid foundation for subsequent trenchless repair.

[0004] Currently, pipeline dredging and flushing mainly employs a combination of high-pressure water flushing trucks and manual labor. This method is effective for general pipeline debris and minor blockages, but it falls short when dealing with complex blockages. Specifically, existing technology has the following limitations: Low flushing efficiency: Conventional high-pressure water flushing can only repeatedly flush the cross-section of the pipe. When the blockage in the pipe is relatively intact or has a complex composition, the flushing efficiency is low and it is difficult to completely remove the blockage.

[0005] Limited applicability: For localized pipe blockages and caking caused by pipe damage, misalignment, uneven settlement, etc., especially for pipes with a diameter of less than 1m and working well openings with small openings (generally 0.6~1m), high-pressure water flushing trucks are ineffective, and manual cleaning of the pipes is extremely difficult.

[0006] High cost of obstacle removal: For solid obstacles that cannot be removed by high-pressure water cleaning, milling robots are usually required for removal. However, milling robots are mainly used for obstacle removal in critical sections, and the construction costs are high, increasing the overall repair cost.

[0007] Low level of automation: Existing technologies rely heavily on manual operation, resulting in low automation levels. This not only leads to low construction efficiency but also makes it difficult to guarantee construction quality, increasing construction risks and safety hazards. Summary of the Invention

[0008] This invention aims to overcome the shortcomings of existing technologies and provide a construction equipment and method for trenchless pretreatment of pipelines. It solves the problems of low dredging efficiency, high risk of manual pipe entry, and the need for multiple entry and exit from the pipeline due to process interruptions in small-diameter and complex silted pipelines. It enables the entire process of loosening, cutting, flushing, and spraying to be completed in one continuous process without the need for personnel to go down into the well.

[0009] To solve the above-mentioned technical problems, the present invention is implemented as follows: A trenchless pipeline pretreatment construction device, characterized in that it comprises: The surface power-control module, located outside the working wellhead, is used to provide axial jacking / pulling force and rotational torque; Downhole support-guide module, which can be detachably fixed to the working well wall and extends into the pipe, is used to maintain the drill pipe axis; The dual drill rod and interchangeable drill bit module are connected to the ground power-control module via quick connectors, and can sequentially complete soil loosening, complex waste cutting, high-pressure water / air combined flushing and cement slurry centrifugal spraying in the same channel. And a fluid supply-slag discharge module for supplying high-pressure water and high-pressure air to the replaceable drill bit and discharging the mud-water mixture; The dual drill rod is driven by the ground power-control module during both the jacking and pulling-back processes, achieving continuous pretreatment with a "one rod to the bottom" method, and the entire operation does not require personnel to enter the pipeline.

[0010] The construction equipment for trenchless pipeline pretreatment is characterized in that: the ground power-control module includes a bidirectional hydraulic jack, a turntable, a hydraulic pump station and a control console; the bidirectional hydraulic jack is pressed against the working well wall; the turntable is positioned by an adjustable fixed support frame; and the control console can adjust the jacking / pulling force and rotation speed in real time.

[0011] The construction equipment for trenchless pipeline pretreatment is characterized in that: the downhole support-guide module consists of an adjustable fixed support frame and an adjustable sliding bracket, wherein the adjustable fixed support frame clamps the well wall through telescopic outrigger wheels, and the adjustable sliding bracket slides along the pipeline axis and supports the drill rod to prevent sagging or swaying during long-distance pullback.

[0012] The construction equipment for trenchless pipeline pretreatment is characterized in that: the double drill rod is a high-pressure jet grouting pile double drill rod, with its central channel conveying high-pressure water / air and its outer channel conveying cement slurry; the replaceable drill bit is connected to the double drill rod through threads, and can be equipped with a milling cutter, a cutting nozzle or a jet grouting nozzle to realize the switching of three functions: cutting, flushing and spraying.

[0013] The construction equipment for trenchless pipeline pretreatment is characterized in that: the replaceable drill bit is provided with at least two sets of nozzles with different spray angles, and the nozzles form a three-dimensional sweeping spray or a fixed-point spray during the rotation of the drill bit, which is used to cut tree branches, long strips of plastic waste and compacted soil; the spraying medium can be switched between high-pressure water and high-pressure air or supplied simultaneously.

[0014] The construction equipment for trenchless pipeline pretreatment is characterized in that: the fluid supply-slag discharge module includes a high-pressure water pump, an air compressor, a mud pump and ground pipelines, the high-pressure water pump and the air compressor are respectively connected to a double drill rod through a manifold, and the mud pump is located in a receiving well to continuously discharge the mud-water mixture.

[0015] The construction equipment for trenchless pipeline pretreatment is characterized in that: the double drill rod or drill bit is equipped with a waterproof camera, which is used to acquire real-time images of the inside of the pipeline during the jacking, pulling back and spraying processes, and transmit them back to the ground monitoring terminal via cable or wireless means.

[0016] The construction method of the trenchless pipeline pretreatment equipment is characterized by the following steps: Step 1: Install the adjustable fixed support frame and ground power-control module in the working well; Step 2: Drive the double drill rod from the working well to the receiving well, switching between the cutting drill bit or milling cutter as needed along the way to loosen and break up the compacted soil and obstacles; Step 3: After arriving at the receiving well, conduct a high-pressure water / air jet test to verify that the channel is unobstructed; Step 4: Pull back the double drill pipe and simultaneously flush with high-pressure water / air through the drill bit nozzle to discharge the waste and mud mixture to the receiving well and then discharge it by the mud pump; Step 5: During or after the pullback process, replace the jet nozzle and use the double drill rod external channel to perform centrifugal high-pressure jet grouting. Step 6: Restart the camera for a second inspection to complete the pipeline pretreatment.

[0017] The construction equipment for trenchless pipeline pretreatment is characterized in that: in step four, when long strips of debris such as branches and plastics become entangled, the debris is loosened and discharged by a combination of back-and-forth drilling and pulling and high-pressure water / air sweeping.

[0018] The construction equipment for trenchless pipeline pretreatment is characterized in that: the drilling and pullback rotation direction of the double drill rod is always consistent with the tightening direction of the interface to prevent the threads from loosening; the extension or disassembly of the drill rod is completed at the wellhead without the need for personnel to enter the pipeline.

[0019] The beneficial effects of this invention are as follows: As can be seen from the above technical solution, this application provides a construction equipment and method for trenchless pipeline pretreatment. Through modular design, it employs advanced equipment such as bidirectional hydraulic jacks, turntables, adjustable fixed support frames, adjustable sliding supports, double drill rods, and replaceable drill bits, combined with auxiliary means such as high-pressure water, high-pressure air, and mud pumps, to achieve efficient cleaning and spraying treatment of complex blocked pipelines. This invention not only improves construction efficiency and reduces construction costs but also ensures construction quality, which is of great significance for promoting the development of trenchless pipeline repair technology.

[0020] Specifically, this invention, through its modular design, enables fixed and oscillating spraying using a dragging and jacking three-dimensional high-pressure jet spraying system without damaging the working well. It can also spray high-pressure water or air onto the internal and external working surfaces to cut, flush, and loosen blockages within the pipes. Combined with a sliding adjustable support, it allows for centrifugal high-pressure jet spraying of cement slurry to treat uneven, corroded pipe walls. A camera positioned above the working well allows for observation and guidance of the pipe cleaning process. The system utilizes a small-diameter drill rod for dragging and jacking, three-dimensional high-pressure jet spraying to dredge, flush, and remove debris from the pipes. The ability to change drill bits for different purposes within the working well enables the cleaning of smaller diameter pipes, reducing the cost of specialized milling robots for obstacle removal. The interchangeable drill bits allow for multi-purpose operation. The use of mechanized construction and mature industrial products achieves high-efficiency, low-cost construction.

[0021] The application of this invention not only achieved the expected design goals, but also improved construction efficiency and ensured construction quality by increasing the automation of pipeline cleaning construction. Furthermore, it has been highly recognized by all parties involved in the construction. The promotion and application of the technical concept of this invention and the resulting comprehensive benefits are a reflection of the company's value in enhancing its core competitiveness in the market. Attached Figure Description

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the pipeline cleaning and construction work.

[0023] Figure 2 This is a schematic diagram of the construction of the working well.

[0024] Figure 3 This is a schematic diagram of a sliding adjustable bracket. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection claimed in this application. like Figure 1-3 As shown: A construction device for trenchless pipeline pretreatment, characterized in that it comprises: The surface power-control module, located outside the working wellhead, is used to provide axial jacking / pulling force and rotational torque; Downhole support-guide module, which can be detachably fixed to the working well wall and extends into the pipe, is used to maintain the drill pipe axis; The dual drill rod and interchangeable drill bit module are connected to the ground power-control module via quick connectors, and can sequentially complete soil loosening, complex waste cutting, high-pressure water / air combined flushing and cement slurry centrifugal spraying in the same channel. And a fluid supply-slag discharge module for supplying high-pressure water and high-pressure air to the replaceable drill bit and discharging the mud-water mixture; The dual drill rod is driven by the ground power-control module during both the jacking and pulling-back processes, achieving continuous pretreatment with a "one rod to the bottom" method, and the entire operation does not require personnel to enter the pipeline.

[0026] The construction equipment for trenchless pipeline pretreatment is characterized in that: the ground power-control module includes a bidirectional hydraulic jack, a turntable, a hydraulic pump station and a control console; the bidirectional hydraulic jack is pressed against the working well wall; the turntable is positioned by an adjustable fixed support frame; and the control console can adjust the jacking / pulling force and rotation speed in real time.

[0027] The construction equipment for trenchless pipeline pretreatment is characterized in that: the downhole support-guide module consists of an adjustable fixed support frame and an adjustable sliding bracket, wherein the adjustable fixed support frame clamps the well wall through telescopic outrigger wheels, and the adjustable sliding bracket slides along the pipeline axis and supports the drill rod to prevent sagging or swaying during long-distance pullback.

[0028] The construction equipment for trenchless pipeline pretreatment is characterized in that: the double drill rod is a high-pressure jet grouting pile double drill rod, with its central channel conveying high-pressure water / air and its outer channel conveying cement slurry; the replaceable drill bit is connected to the double drill rod through threads, and can be equipped with a milling cutter, a cutting nozzle or a jet grouting nozzle to realize the switching of three functions: cutting, flushing and spraying.

[0029] The construction equipment for trenchless pipeline pretreatment is characterized in that: the replaceable drill bit is provided with at least two sets of nozzles with different spray angles, and the nozzles form a three-dimensional sweeping spray or a fixed-point spray during the rotation of the drill bit, which is used to cut tree branches, long strips of plastic waste and compacted soil; the spraying medium can be switched between high-pressure water and high-pressure air or supplied simultaneously.

[0030] The construction equipment for trenchless pipeline pretreatment is characterized in that: the fluid supply-slag discharge module includes a high-pressure water pump, an air compressor, a mud pump and ground pipelines, the high-pressure water pump and the air compressor are respectively connected to a double drill rod through a manifold, and the mud pump is located in a receiving well to continuously discharge the mud-water mixture.

[0031] The construction equipment for trenchless pipeline pretreatment is characterized in that: the double drill rod or drill bit is equipped with a waterproof camera, which is used to acquire real-time images of the inside of the pipeline during the jacking, pulling back and spraying processes, and transmit them back to the ground monitoring terminal via cable or wireless means.

[0032] This equipment mainly adopts a modular design and consists of a two-way hydraulic jack, a turntable, an adjustable fixed support frame, an adjustable sliding support, double drill rods, replaceable drill bits, a synchronous hydraulic jack backstage, a high-pressure water backstage, a high-pressure air backstage, a mud pump, and a camera.

[0033] Dual drill pipes and interchangeable drill bits can utilize commercially available dual drill pipes and drill bits for high-pressure jet grouting piles (custom lengths are required to meet the limitations of the working well and wellhead). A construction method for trenchless pipeline pretreatment equipment. First, install an adjustable fixed support frame at the opening of the working well pipe; then, lower four bidirectional hydraulic jacks and a turntable into the working well; after the hydraulic jacks and turntable are assembled into a whole, lift them to the predetermined position and tighten them against the working well wall (usually a reinforced concrete structure) using the bidirectional hydraulic jacks; then, lower the customized length of double drill rod and drill bit through the well opening.

[0034] During the drilling process from the working well to the receiving well, the drill rod is driven by a two-way hydraulic jack, and the rotary table provides the rotation torque. If drilling becomes difficult during the double drill rod rotation process, high-pressure gas can be used to cut and loosen the soil, and water can be sprayed to reduce friction. During the pullback process from the receiving well to the working well, the drill pipe pullback is powered by a two-way hydraulic jack, while the rotary table provides torque. During the double drill pipe rotation pullback process, high-pressure gas and high-pressure water can be used to cut and scour the soil to form a mud-water mixture that flows into the receiving well and is then removed by a mud pump. Debris that is inconvenient to remove is manually removed from the receiving well.

[0035] The drilling process is generally fast, mainly to loosen the soil and drill to the receiving well. After the drill bit reaches the receiving well, it needs to be cleaned and tested with high-pressure water and high-pressure air before being pulled back.

[0036] During drill rod pullback, the speed generally needs to be slowed down. The main purpose is to use high-pressure gas and water to cut and scour the soil, forming a mud-water mixture that flows into the receiving well and is then discharged by a mud pump. When encountering long, thin debris such as tree branches or plastic, the drill can be pulled back and forth in a localized area for sweeping or fixed-point spraying. The high-pressure gas and water jet direction can be set to the same or different angles on the same replaceable drill bit, and three-dimensional angle spraying is achieved by rotation.

[0037] Double drill pipe and interchangeable drill bits can be used with commercially available double drill pipe and drill bits for high-pressure jet grouting (custom length required to meet the limitations of the working well and wellhead). Rotation must be in one direction during drilling and pullback, according to the tightening direction of the interface.

[0038] The pipeline cleaning process and results can be observed and guided on-site construction using a pre-installed camera on the drill bit or drill rod; when the pipeline is corroded and the inner wall is uneven, centrifugal high-pressure jet spraying of cement slurry can be used for treatment.

[0039] Replaceable drill bits can be end mills for cutting solids or other specialized tools for specific purposes. End mills can be used during drill rod drilling and retraction.

[0040] Drill rods are installed and removed on or behind the rotary table. When the pipeline is large enough for personnel to enter, a certain length of drill rod can be pre-assembled on the pipeline behind the working well to speed up construction. If the upstream and downstream pipeline axes are on the same plane, an adjustable sliding bracket can be used to assemble the drill rod as a whole inside the pipeline.

[0041] When the project involves a large amount of work, the wellhead can be broken up and a longer single drill pipe can be used. Pre-made drill pipes available on the market should be used as much as possible.

[0042] Both the adjustable fixed support frame and the adjustable sliding support frame use screw rods to adjust the support length and rollers to ensure that the rotation of the drill pipe is not affected; the difference is that the adjustable fixed support frame is pressed against the working well, while the adjustable sliding support frame can slide in the direction of the pipeline axis.

[0043] By adopting the above technical solution, With centralized ground drive via a "two-way hydraulic jack + rotary table", the entire process of "jacking and loosening - pulling back and flushing - spraying and reinforcement" can be completed in one go with double drill pipes. The pretreatment of a single 100 m section of pipeline is reduced from the traditional 3-4 shifts to less than 8 hours. The drill pipe section is ≤1.5 m, and it can be quickly unloaded at the wellhead, reducing downtime and significantly improving work efficiency.

[0044] All power and control equipment is located on the ground or at the wellhead, and only adjustable supports and sliding brackets are needed underground. Personnel can complete the work without entering the pipeline, completely eliminating the risks of confined space operations such as toxic gases, collapses, and electric shocks, and greatly reducing safety risks.

[0045] The modular design directly adopts mature finished components such as high-pressure rotary jet double drill rods and milling cutter heads, making the equipment purchase and maintenance costs far lower than those of dedicated milling cutter robots. At the same time, it avoids repeated blocking, water pumping, ventilation, and night shifts, reducing traffic diversion and labor costs simultaneously, resulting in a significant reduction in overall costs.

[0046] The interchangeable drill bit enables one-click switching between three functions: cutting, flushing, and spraying; high-pressure water / air three-dimensional sweeping and spraying, combined with real-time camera visualization, ensures thorough removal of complex waste and compacted soil; subsequent centrifugal high-pressure jet grouting can be completed within the same drill rod path, significantly improving pipe wall smoothness and bonding strength, and ensuring stable and controllable treatment quality.

[0047] The adjustable fixed support frame and sliding bracket can be installed in a conventional inspection well of only 0.6–1 m without damaging the wellhead structure; it can be quickly adapted to different pipe diameters of DN300–DN1200 and different degrees of clogging by changing the drill bit and adjusting the injection parameters, achieving "zero excavation, zero road occupation, and zero greening relocation", with strong site adaptability.

[0048] The above are merely embodiments provided in this application and are not intended to limit this application. Although this application has been described in detail with reference to the 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. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A construction device for trenchless pipeline pretreatment, characterized in that... It includes: The surface power-control module, located outside the working wellhead, is used to provide axial jacking / pulling force and rotational torque; Downhole support-guide module, which can be detachably fixed to the working well wall and extends into the pipe, is used to maintain the drill pipe axis; The dual drill rod and interchangeable drill bit module are connected to the ground power-control module via quick connectors, and can sequentially complete soil loosening, complex waste cutting, high-pressure water / air combined flushing and cement slurry centrifugal spraying in the same channel. And a fluid supply-slag discharge module for supplying high-pressure water and high-pressure air to the replaceable drill bit and discharging the mud-water mixture; The dual drill rod is driven by the ground power-control module during both the jacking and pulling-back processes, achieving continuous pretreatment with "one rod to the bottom" and eliminating the need for personnel to enter the pipeline during the entire operation.

2. The construction equipment for trenchless pipeline pretreatment according to claim 1, characterized in that: The ground power-control module includes a two-way hydraulic jack, a turntable, a hydraulic pump station, and a control console. The two-way hydraulic jack is pressed tightly against the working well wall, the turntable is positioned by an adjustable fixed support frame, and the control console can adjust the jacking / pulling force and rotation speed in real time.

3. The construction equipment for trenchless pipeline pretreatment according to claim 1, characterized in that: The downhole support-guide module consists of an adjustable fixed support frame and an adjustable sliding bracket. The adjustable fixed support frame clamps the well wall through telescopic outrigger wheels, while the adjustable sliding bracket slides along the pipeline axis and supports the drill pipe to prevent sagging or swaying during long-distance pullback.

4. The construction equipment for trenchless pipeline pretreatment according to claim 1, characterized in that: The double drill rod is a high-pressure jet grouting pile double drill rod, with its central channel conveying high-pressure water / air and its outer channel conveying cement slurry; the replaceable drill bit is connected to the double drill rod through threads, and can be equipped with a milling cutter, cutting nozzle or jet grouting nozzle to realize the switching of three functions: cutting, flushing and spraying.

5. The construction equipment for trenchless pipeline pretreatment according to claim 1, characterized in that: The replaceable drill bit is equipped with at least two sets of nozzles with different spray angles. The nozzles form a three-dimensional sweeping spray or a fixed-point spray during the rotation of the drill bit, which is used to cut tree branches, long strips of plastic waste and compacted soil. The spraying medium can be switched between high-pressure water and high-pressure air or supplied simultaneously.

6. The construction equipment for trenchless pipeline pretreatment according to claim 1, characterized in that: The fluid supply-slag discharge module includes a high-pressure water pump, an air compressor, a mud pump, and surface pipelines. The high-pressure water pump and the air compressor are respectively connected to the double drill pipe through a manifold. The mud pump is located in the receiving well to continuously discharge the mud-water mixture.

7. The construction equipment for trenchless pipeline pretreatment according to claim 1, characterized in that: The dual drill rod or drill bit is equipped with a waterproof camera to acquire real-time images of the inside of the pipeline during jacking, pulling back, and spraying processes, and transmit the images back to the ground monitoring terminal via cable or wireless means.

8. A construction method for a trenchless pipeline pretreatment construction equipment according to any one of claims 1-7, characterized in that... Includes the following steps: Step 1: Install the adjustable fixed support frame and ground power-control module in the working well; Step 2: Drive the double drill rod from the working well to the receiving well, switching between the cutting drill bit or milling cutter as needed along the way to loosen and break up the compacted soil and obstacles; Step 3: After arriving at the receiving well, conduct a high-pressure water / air jet test to verify that the channel is unobstructed; Step 4: Pull back the double drill pipe and simultaneously flush with high-pressure water / air through the drill bit nozzle to discharge the waste and mud mixture to the receiving well and then discharge it by the mud pump; Step 5: During or after the pullback process, replace the jet nozzle and use the double drill rod external channel to perform centrifugal high-pressure jet grouting. Step 6: Restart the camera for a second inspection to complete the pipeline pretreatment.

9. The construction equipment for trenchless pipeline pretreatment according to claim 8, characterized in that: In step four, when long strips of debris such as branches and plastic become entangled, the debris is loosened and discharged by a combination of back-and-forth drilling and pulling and high-pressure water / air sweeping.

10. A construction equipment for trenchless pipeline pretreatment according to claim 8 or 9, characterized in that: The drilling and pullback rotation direction of the dual drill rod is always consistent with the tightening direction of the interface to prevent the threads from loosening; the extension or disassembly of the drill rod is completed at the wellhead without the need for personnel to enter the pipeline.

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