Main pipe assembly and manufacturing method, construction method and system thereof

Abstract

The invention discloses a main pipe assembly and a manufacturing method, a construction method and a system thereof. The dry pipe assembly comprises an inner-layer rubber pipe formed through an extrusion process and an outer-layer belt blank woven on the outer side of the inner-layer rubber pipe through a circular weaving machine, the inner surface of the outer-layer belt blank can be separated, and a cavity used for containing resin is formed between the inner-layer rubber pipe and the outer-layer belt blank. The manufacturing method comprises the steps of inner-layer rubber tube extrusion, gradient cooling, surface modification, outer-layer strip blank weaving and rolling, surface modification comprises sand blasting, plasma-induced maleic anhydride grafting and epoxy resin prime coat treatment, and closed-loop control is adopted in the surface modification process and the prime coat process. The manufacturing system comprises a forming device, a cooling device, a weaving device and a winding device. In the pipeline repairing construction, the main pipe assembly and the inner wall of the pipeline are bonded into a whole through the operations of main pipe unwinding, glue injection, glue pressing, dragging into the to-be-repaired pipeline, pressurization and attachment and curing. By optimizing the structural design and the process, the bonding reliability of the main pipe assembly and the pipeline is improved, and the pipeline repairing quality and the construction efficiency are guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of trenchless pipeline repair technology, specifically relating to a trunk pipe assembly and its manufacturing method, construction method and system, which is mainly applied to structural repair projects of underground pipelines such as water supply and drainage, petrochemicals, and municipal pipe networks. Background Technology

[0002] Traditional trunking assemblies often employ a simple composite structure of fiber-braided tape and a sealing layer. Their interfacial bonding relies primarily on physical bonding or general-purpose adhesives, resulting in insufficient bond strength, poor resistance to media, and a tendency for interfacial delamination over long-term use. Particularly when the transported medium is corrosive or when there are frequent pressure fluctuations within the pipe, simple mechanical bonding methods are insufficient to effectively resist the synergistic effects of stress concentration and chemical erosion, leading to premature failure of the repair layer and hindering its widespread application in pipeline repair.

[0003] Traditional manufacturing processes typically employ a segmented operation: first, the sealing hoses are produced and wound independently, then transferred to another site for outer layer fabrication. This process involves multiple unwinding and winding operations, which is not only inefficient but also prone to surface contamination, mechanical damage, or dimensional deformation of the sealing hoses. For non-polar polymer materials such as PE, their surface has poor chemical compatibility with epoxy resin. Traditional processes rely on empirical parameters for roughening or priming treatments, resulting in significant batch-to-batch variations in product bonding performance and generally low pass rates, failing to guarantee the reliability of repair projects.

[0004] Existing equipment largely relies on manual sampling and offline adjustments, resulting in delayed responses and an inability to compensate in real time for deviations caused by raw material fluctuations or changes in equipment status. This open-loop control mode leads to poor production process stability and difficulty in ensuring product quality consistency, becoming a prominent technical obstacle restricting the large-scale and standardized production of high-performance trunking components. Therefore, developing a manufacturing system capable of achieving full-process online quality control and ensuring highly stable product performance is urgently needed. Summary of the Invention

[0005] The purpose of this invention is to provide a trunking assembly and its manufacturing method, construction method and system, to solve the problems of insufficient interfacial bonding strength of trunking assemblies, large quality fluctuations caused by discrete production processes, and lack of online quality control methods in the prior art.

[0006] The first objective of this invention is to provide a trunking assembly, comprising: The inner tubing is formed from rubber and plastic material through an extrusion process. The rubber and plastic material is either PE or TPU. The outer strip preform is nested on the outside of the inner tubing. The outer layer preform is woven on the outside of the inner layer tubing by a circular loom, and the inner surface of the outer layer preform and the outer surface of the inner layer tubing can be separated, forming a cavity between the outer layer preform and the inner layer tubing to accommodate resin.

[0007] The second objective of this invention is to provide a method for manufacturing a trunking assembly, comprising the following steps: S1 Inner Tube Fabrication: Molten rubber is extruded using an extruder to form the inner tube; S2 cooling: The inner rubber hose is cooled by a cooling device; S3 Braided Outer Layer Strip Blank: The inner layer rubber tube is drawn into the inlet of the circular loom, and the circular loom braids the outer layer strip blank on the outside of the inner layer rubber tube. S4 winding: The nested outer strip blank and inner hose are wound into a roll for the dry hose assembly.

[0008] A third objective of this invention is to provide a manufacturing system for a trunking assembly, for implementing the aforementioned manufacturing method for a trunking assembly, comprising: Inner tube forming device, used to extrude molten rubber to form inner tube; Cooling device for cooling the inner rubber hose; The outer layer strip braiding device is used to braid the outer layer strip blank on the outside of the inner layer tubing; A winding device is used to wind nested outer strip blanks and inner tubing into a roll assembly.

[0009] The fourth objective of this invention is to provide a pipeline repair construction method, comprising: a) Manufacturing of the trunking assembly: The trunking assembly roll is manufactured using the manufacturing method of the trunking assembly according to claim 1; b) On-site unwinding of main pipe: Unwinding the main pipe assembly roll at the construction site; c) Glue injection: Insert the injection needle of the glue injection device between the inner rubber tube and the outer strip blank of the unwound dry tube assembly to inject glue; d) Pressing: Use a pressing roller to press the glued dry tube assembly so that the glue is evenly distributed between the inner tube and the outer strip blank of the dry tube assembly. e) Pull in: Pull the dry pipe assembly that has been treated with adhesive sealant from the inlet end of the pipe to be repaired toward the outlet end; f) Pressure bonding: After dragging the main pipe assembly into the pipe to be repaired, pressurized fluid is injected into the inner cavity of the main pipe assembly to make the main pipe assembly open and bond to the inner wall of the pipe to be repaired. g) Curing: The dry pipe assembly that has been stretched and attached to the inner wall of the pipe to be repaired is cured, so that the adhesive between the inner rubber tube and the outer strip blank penetrates into the inner wall of the pipe to be repaired and cures and bonds, thereby bonding the inner rubber tube, the outer strip blank and the inner wall of the dry pipe assembly to the inner wall of the pipe to be repaired into one piece.

[0010] The fifth objective of this invention is to provide a pipeline repair construction system, comprising: The manufacturing system for the hose assembly includes an inner hose forming device, a cooling device, an outer strip braiding device, and a winding device; Unwinding device, used to unwind the drum of the main pipe assembly at the construction site; The glue injection device is used to inject glue between the inner rubber tube and the outer strip blank of the unwound dry tube assembly; The adhesive pressing device includes an adhesive pressing roller for pressing the glued dry tube assembly to distribute the glue evenly. A traction device is used to pull the dry pipe assembly that has been pressed with adhesive from the inlet end of the pipe to be repaired toward the outlet end, so that the dry pipe assembly is inserted into the pipe to be repaired. A pipe support device is used to inject pressurized fluid into the inner cavity of the main pipe assembly, causing the main pipe assembly to be stretched and fit against the inner wall of the pipe to be repaired. The curing device is used to cure the dry pipe assembly that has been stretched and adhered to the inner wall of the pipe to be repaired.

[0011] Compared with the prior art, the trunking assembly, its manufacturing method, construction method, and system provided by the present invention have the following significant and beneficial technical effects: (1) Improved interfacial bonding performance and reliability of the main pipe assembly. This invention introduces a multi-step surface modification process that combines mechanical grinding, grafting modification and primer treatment to build a multi-synergistic bonding mechanism of physical anchoring, chemical bonding and interfacial bridging on the outer surface of the inner hose, thereby improving the bonding strength, reducing the delamination rate and enhancing the stability of the repaired pipe.

[0012] (2) Achieving high-quality, high-efficiency, continuous online production. This invention integrates cooling, surface modification, and outer layer weaving processes into a single production line, achieving seamless integration from raw materials to finished products. Employing a "gradient cooling + instant weaving" process, the cooling rate and weaving window temperature are controlled to actively form a micro-protrusion structure on the tube wall surface, improving its fit with the strip blank. A closed-loop control system monitors key parameters such as roughness, grafting rate, and film thickness in real time and dynamically adjusts the process to improve product qualification rate.

[0013] (3) An intelligent and highly consistent quality control system has been established. By embedding online detection sensors in each key process and linking them with the central controller, closed-loop feedback control of the entire surface modification process has been realized. The system can automatically adjust parameters such as sandblasting pressure, grafting time, and coating speed according to real-time detection data, thereby improving the consistency between product batches and providing a stable and reliable trunk pipe component product guarantee for pipeline repair projects. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a flowchart illustrating the manufacturing method of the trunking assembly in an embodiment of the present invention; Figure 2 This is a schematic diagram of weaving an outer layer strip blank on the outside of an inner layer rubber tube using a circular loom in an embodiment of the present invention; Figure 3 This is a flowchart of the manufacturing method of the dry pipe assembly in an embodiment of the present invention, which includes a surface modification treatment step; Figure 4 This is a schematic diagram of the cross-section of the main pipe assembly; Figure 5 This is a flowchart of the manufacturing method of the dry pipe assembly in an embodiment of the present invention, which includes the steps of surface modification treatment and closed-loop control; Figure 6 This is a flowchart of the pipeline repair construction method in an embodiment of the present invention.

[0016] Explanation of reference numerals in the attached diagram: 1-Inner rubber tube; 2-Opening; 3-Circular loom; 4-Outer strip blank; 5-Yarn. Detailed Implementation

[0017] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid obscuring the invention.

[0018] To fully understand this invention, detailed steps and structures will be presented in the following description to illustrate the technical solution of this invention. Preferred embodiments of the invention are described in detail below; however, in addition to these detailed descriptions, the invention may have other embodiments.

[0019] Example 1 Please refer to Figure 4 The dry tube assembly of this invention comprises an inner rubber tube 1 and an outer strip blank 4 nested together. The outer strip blank 4 is nested outside the inner rubber tube 1, and the inner surface of the outer strip blank 4 is separable from the outer surface of the inner rubber tube 1 to facilitate subsequent glue injection between the outer strip blank 4 and the inner rubber tube 1. The inner rubber tube 1 is formed from rubber and plastic material through an extrusion process, and the outer strip blank 4 can be woven on the outside of the inner rubber tube 1 by a circular loom 3. The dry tube assembly is manufactured in-house, and the appropriate rubber and plastic particles are selected according to the conveying medium. The rubber and plastic materials can include, but are not limited to, PE and TPU materials. If PE material is selected as the material for forming the inner rubber tube 1, the extrusion temperature of PE material is 190-220℃, and hot melt adhesive particles can be optionally added to increase adhesion. TPU is short for Thermoplastic Polyurethane Elastomer, a polymer material with very balanced properties, possessing dual characteristics of both plastics and rubber. Common TPU materials include polyester-based TPU, polyether-based TPU, and polycaprolactone-based TPU. If TPU is chosen as the material to form the inner tube 1, the relevant parameters can be set as follows: TPU particle extrusion temperature 180-195℃, extrusion pressure <15MPa, and extrusion speed 8-20m / h. The inner tube 1 provides resistance to media, allowing the fluid medium to flow through. The outer strip 4 is nested on the outside of the inner tube 1. The outer strip 4 is woven on the outside of the inner tube 1 using a circular loom 3, with yarn 5 woven through the openings 2 of the circular loom 3. The outer strip 4 has a high weave density, and the adhesive injected between the inner tube 1 and the outer strip 4 is relatively viscous when unheated, making it difficult to penetrate the outer strip 4 and reach its outer surface.

[0020] The inner hose 1 can be extruded from PE or TPU material within a temperature range of 190-220℃ / 180-195℃ using an extruder. The inner hose 1 provides excellent resistance to media, ensuring safe fluid transport. The outer strip 4 is precision-woven on a circular loom 3, possessing high strength and capable of withstanding significant pressure. The overall structure of the inner hose 1 is highly adaptable, allowing for flexible material selection based on the characteristics of the transported medium to meet diverse operating conditions. Using this inner hose 1 to repair pipelines can significantly extend pipeline service life, providing a reliable and economical solution for pipeline repair under long-distance, high-pressure conditions.

[0021] Example 2 Please refer to Figure 1 and Figure 2 The method for manufacturing the trunking assembly involved in this invention mainly includes the following steps: S1 Inner rubber tube fabrication: Molten rubber is extruded using an extruder to form inner rubber tube 1; S2 Cooling: The inner rubber tube 1 is cooled by a cooling device; S3 Braided outer layer strip blank: The inner layer rubber tube 1 is pulled into the inlet of the circular loom 3, and the circular loom 3 braids the outer layer strip blank 4 on the outside of the inner layer rubber tube 1. S4 winding: The nested outer strip blank 4 and inner hose assembly are wound into a roll of dry hose assembly.

[0022] The above method can be used to easily manufacture high-quality dry pipe assembly rolls for use in glue-injection type perforated hose lining repair technology.

[0023] It should be noted that this invention employs a method where, after the inner rubber tube 1 is formed and cooled, it is directly drawn into the circular loom 3 without being wound up to weave the outer strip blank 4. Compared to the traditional staged operation method, this mode has significant advantages: it improves production efficiency and reduces overall costs by eliminating intermediate steps such as winding, transportation, and unwinding. Simultaneously, it avoids surface contamination, dimensional deformation, and failure or damage to the modified active surface of the inner rubber tube 1 that may occur during intermediate storage and transportation, thereby fundamentally ensuring the high consistency and reliability of the product, especially its interfacial bonding performance.

[0024] The outer strip blank 4 and the inner rubber tube 1 are wound into a roll assembly by a winding device. In the winding process, the winding device winds the composite dry tube assembly formed by the inner rubber tube 1 with the outer strip blank 4 already woven and nested, into shape by a winding roller. At the same time, an automatic winding system is equipped to ensure that the dry tube assembly is evenly distributed on the roll, forming a standardized roll assembly with a compact structure, no cross deformation, and easy transportation and storage.

[0025] When the inner tubing 1 is made of thermoplastic polyurethane (TPU), the cooling process in step S2 employs a gradient cooling process. This process aims to optimize the microstructure of the outer surface of the inner tubing 1 to enhance its mechanical interlocking with the subsequently braided outer strip 4. Specifically, the gradient cooling process consists of two stages: First, the inner tubing 1, freshly extruded from the extruder and still in a molten state, is immersed in a first hot water bath at a temperature of 60°C to 80°C for 5 to 10 seconds. This high-temperature, short-time cooling stage allows the inner tubing 1 to initially take shape, effectively preventing deformation of the tubing due to excessively rapid cooling or uneven stress. Subsequently, the initially shaped inner tubing 1 is immediately introduced into a second cold water bath at a temperature of 20°C to 30°C for further cooling for 10 to 15 seconds. By coordinating and controlling the temperature difference and time between the two cooling stages, the overall average cooling rate of the inner tubing 1 is controlled at 5°C / s to 8°C / s. The aforementioned gradient cooling induces controllable phase separation and crystallization on the surface of the TPU material, thereby actively forming a uniformly distributed micro-bump structure on the outer surface of the inner tube 1. Microscopic observation shows that the height of these micro-bumps is approximately 0.1 μm to 0.3 μm, and the spacing is approximately 0.5 μm to 1.0 μm. This specific surface morphology avoids the formation of a smooth surface, providing effective physical engagement points for the yarns 5 of the subsequent outer tape preform 4. After gradient cooling, the surface temperature of the inner tube 1 is precisely controlled within the optimal window of 35°C to 45°C. At this temperature, the TPU material maintains sufficient flexibility to avoid brittleness while also possessing sufficient dimensional stability. Subsequently, within 30 seconds after the cooling process ends, the inner tube 1, with its temperature within this optimal range, is rapidly drawn into the inlet of the circular loom 3, immediately initiating the outer tape preform 4 weaving process in step S4. This immediate weaving strategy minimizes the chance of dust adsorbing onto the surface of the inner tube 1 exposed to air and ensures that the micro-bump structure contacts the yarns 5 in optimal condition. During weaving, the weaving tension of the circular loom 3 is controlled at 5N to 8N, and the weaving density is 20 to 30 threads / cm. Under these parameters, the yarn 5 can tightly interlock with the micro-protrusions on the surface of the inner tubing 1, improving the final bonding strength between the two. Through this synergistic solution of gradient cooling and instant weaving, the interfacial bonding force between the inner tubing 1 and the outer strip blank 4 is improved. Compared with the conventional method of directly cooling and then weaving, the bonding force is improved, and the delamination rate during subsequent epoxy resin impregnation is reduced.

[0026] After the inner tubing 1 is drawn out of the extruder and cooled, a surface treatment is performed on the outer surface of the inner tubing 1 to improve the adhesion between the outer surface of the inner tubing 1 and the adhesive to be injected. Therefore, a surface modification treatment step for the outer surface of the inner tubing 1 can be added between steps S3 and S4. Please refer to [reference needed]. Figure 3 Surface modification includes: S2a Mechanical polishing: Mechanical roughening treatment is applied to the outer surface of the inner tubing 1; S2b grafting modification: Grafting treatment is performed on the roughened outer surface, and compounds containing polar functional groups are grafted onto the polymer surface of the inner tubing 1 through chemical reaction or high-energy irradiation. S2c Primer Treatment: A primer containing an epoxy resin adhesion promoter is applied to the grafted modified outer surface.

[0027] In some preferred embodiments, the mechanical roughening treatment of the outer surface of the inner tubing 1 in step S2a is achieved using a sandblasting process. This process is particularly suitable when the material of the inner tubing 1 is a non-polar polymer with poor adhesion to epoxy resin, such as polyethylene (PE). Specifically, the inner tubing 1, after cooling and shaping in step S3, is continuously pulled through an online sandblasting device. The online sandblasting device has a sealed processing chamber, which can uniformly treat the outer surface of the continuously moving inner tubing 1, effectively removing any burrs or residual adhesive. The abrasive used in the sandblasting process is 80-120 mesh brown corundum abrasive grains. The sandblasting air pressure is 0.3 MPa to 0.5 MPa, the distance between the sandblasting nozzle and the outer surface of the inner tubing 1 is controlled between 15 cm and 25 cm, and the processing time of the inner tubing 1 through the sandblasting area is 10 s to 20 s. By precisely controlling the sandblasting process parameters, a uniform and moderately textured surface can be formed on the outer surface of the inner tubing 1. Measurements showed that the arithmetic mean roughness Ra of the outer surface of the treated inner tubing 1 could reach an optimized range of 1.5 μm to 2.5 μm, with its microstructure consisting of pits approximately 0.8 μm to 1.2 μm deep and spaced approximately 2 μm to 3 μm apart. This roughness range is reasonably designed: on the one hand, it provides sufficient specific surface area and mechanical anchoring points, creating a large number of active sites for subsequent grafting modification steps; on the other hand, it avoids the decrease in strength of the inner tubing 1 or the generation of surface defects due to excessive polishing.

[0028] In one specific embodiment, the grafting modification treatment in step S2b is particularly suitable for the inner tubing 1 made of non-polar polymers such as polyethylene (PE) after the mechanical roughening treatment in step S2a. This step aims to introduce polar functional groups onto the tubing surface through chemical means, thereby fundamentally improving its chemical adhesion to epoxy resin. Grafting modification is achieved through high-energy irradiation induction. Specifically, a low-temperature plasma-induced grafting method is used, which comprises two consecutive stages: The first stage is plasma pretreatment: the inner tubing 1, which has undergone mechanical roughening and has a specific uneven surface structure, is continuously passed through an online low-temperature plasma treatment device. The treatment is carried out in an inert argon atmosphere, with the plasma output power controlled between 300W and 500W, and the treatment time on the outer surface of the inner tubing 1 is 5s to 8s. This pretreatment effectively activates the PE molecular chains, generating active groups such as hydroxyl and carboxyl groups on its surface, thus improving the surface's chemical activity. Crucially, because the pits created by the previous mechanical roughening have higher surface energy, the active species generated by the plasma preferentially act on these pit areas, resulting in a significantly higher density of active sites within the pits compared to the raised areas.

[0029] The second stage is the grafting reaction: After plasma pretreatment, the inner tubing 1 is immediately guided through a grafting reaction zone. In this zone, a 5wt% to 10wt% maleic anhydride ethanol solution is applied uniformly to the active outer surface of the inner tubing 1 by spraying or coating. Subsequently, a plasma-induced grafting reaction is carried out at a temperature of 60°C to 80°C for 15 to 30 minutes. During this process, the anhydride groups in the maleic anhydride monomer react chemically with the activated active sites on the PE surface, firmly grafting onto the polymer molecular chain in the form of covalent bonds.

[0030] By precisely controlling the aforementioned power, concentration, temperature, and time parameters, the final grafting rate can be stably controlled within the ideal range of 1.2 wt% to 2.0 wt%. Due to the selective activation effect of plasma pretreatment, maleic anhydride monomers preferentially accumulate and graft within the pits created by mechanical roughening, resulting in a grafting concentration within the pits that is 2 to 3 times higher than that at surface protrusions. This anchoring enrichment effect, combined with the physical anchoring points provided by mechanical roughening, achieves synergistic reinforcement of physical intercalation and chemical bonding, laying the foundation for a strong subsequent bond with epoxy resin.

[0031] In a preferred embodiment, the primer treatment in step S2c is a further step to enhance interfacial adhesion performance based on the grafting modification in step S2b. This step is particularly suitable for applications requiring extremely high adhesion reliability. Specifically, the primer treatment involves uniformly coating a dedicated primer onto the outer surface of the inner tubing 1, which has already undergone mechanical roughening and grafting modification. This primer is an epoxy resin adhesion promoter, specifically composed of a polyolefin solution containing 5 wt% to 8 wt% maleic anhydride. The primer is formulated using a solvent of xylene and ethanol mixed in a 3:1 volume ratio to obtain suitable spray viscosity and leveling properties. The coating operation is completed using an integrated online micro-quantity spraying system to ensure the uniformity and consistency of the coating. After coating, the thickness of the wet film must be precisely controlled between 0.5 μm and 1.0 μm. This film thickness range is optimized; if the film thickness is too thin, it cannot fully fill the surface micro-pits and form a continuous interfacial layer; if the film thickness is too thick, internal stress may be generated due to solvent evaporation or curing shrinkage, which may negatively affect the adhesion strength. After coating, a curing process is required. Guide the inner tube 1 coated with primer through a low-temperature curing zone and maintain it at a temperature of 60°C to 70°C for 10 to 15 minutes to allow the primer to fully cure and form a firm base coating.

[0032] This primer treatment plays a crucial role through a fill-reaction synergistic mechanism. Firstly, it involves physical filling. The liquid primer effectively wets and fills the microscopic pits and gaps on the outer surface of the roughened and grafted inner tubing 1, displacing interfacial air and thus preventing interfacial bubbles during subsequent epoxy resin impregnation. Secondly, it involves chemical bonding. The polyolefin segments in the primer are highly compatible with the PE substrate, while its maleic anhydride groups possess dual reactivity: on the one hand, they can form a strong bond with the grafted maleic anhydride functional groups in the grafted modified layer through interactions between anhydride groups or by reacting with any small amount of carboxyl groups present in the grafted layer; on the other hand, during subsequent pipe repair, these maleic anhydride groups can undergo ring-opening reactions with the epoxy groups of the impregnated epoxy resin, forming strong chemical bonds (covalent bonds). Therefore, this base coating layer acts as a bridge between the grafted modified layer and the epoxy resin, enhancing the chemical adhesion of the interface by forming double chemical bonds, and improving the reliability of the trunking assembly in long-term use.

[0033] It should be noted that steps S2a (mechanical roughening), S2b (grafting modification), and S2c (primer treatment) are performed sequentially. These three steps, through functional synergy and complementarity, constitute a complete, efficient, and stable technical solution, producing a synergistic effect. First, step S2a creates a microscopic uneven structure, providing mechanical anchoring points for bonding and increasing the specific surface area. Step S2b, building on this, utilizes the high activity of the rough surface, especially the pitted areas, to anchor and enrich polar functional groups (such as maleic anhydride), elevating the bonding mechanism from physical action to chemical bonding. Step S2c fills the microscopic pits with a primer to eliminate interface defects, and its molecules act as bridging agents, bonding one end to the grafted layer and reacting with the epoxy resin at the other end, achieving a perfect interface transition. This combination produces beneficial effects unmatched by single or two-step treatments. Through the triple action of mechanical interlocking, chemical bonding, and interface bridging, it achieves high initial bond strength and excellent bond durability, effectively resisting environmental stress and reducing the risk of delamination.

[0034] In one specific implementation, to address the problem of unstable surface treatment and low product qualification rate of the PE inner layer hose 1 caused by factors such as raw material batches and equipment fluctuations, this invention employs a closed-loop automatic control system for step S2a mechanical roughening treatment, step S2b grafting modification, and step S2c primer treatment. This system enables real-time detection and dynamic adjustment of process parameters, ensuring a high degree of consistency in the bonding performance of the final product. The closed-loop control specifically includes the following three stages: 1. S2a-1 Online Roughness Control. After the inner tubing 1 undergoes mechanical roughening treatment, the arithmetic mean roughness Ra value of its outer surface is immediately detected online using a laser roughness meter. The detection data is transmitted to the central control system in real time. The control system compares the detected Ra value with a preset target range (a first preset threshold and a second preset threshold). As a specific optimization embodiment, this target range is set to Ra 1.5μm to 2.5μm. If the detected Ra value is lower than 1.5μm, the control system automatically sends a command to the sandblasting device to increase the sandblasting pressure by 0.05MPa; if the detected Ra value is higher than 2.5μm, the sandblasting pressure is automatically decreased by 0.05MPa. Through this real-time feedback adjustment, the roughness is stably controlled within the optimal range.

[0035] 2. Online Control of S2b-1 Grafting Rate. After the inner tube 1 has undergone grafting modification, its outer surface is immediately scanned using an online Fourier transform infrared spectroscopy (FTIR) instrument to monitor the intensity of the characteristic peaks of maleic anhydride and calculate the grafting rate accordingly. The calculated grafting rate is fed back to the control system in real time. The control system compares this measured value with a preset target range (a third preset threshold and a fourth preset threshold). In one specific embodiment, the target grafting rate range is set to 1.2 wt% to 2.0 wt%. If the grafting rate is lower than 1.2 wt%, the control system automatically extends the plasma grafting reaction time by 5 minutes; if the grafting rate is higher than 2.0 wt%, the control system automatically shortens the grafting reaction time by 5 minutes. This ensures the stability of the grafting modification effect.

[0036] 3. S2c-1 Online Film Thickness Control. Immediately after the primer coating is applied to the inner tubing 1, the wet film thickness is measured using an online film thickness gauge. The measured film thickness is transmitted to the control system in real time. The control system compares this measured value with a preset target range (the fifth and sixth preset thresholds). For example, the target film thickness can be set to 0.5 μm to 1.0 μm. If the detected film thickness is below 0.5 μm, the control system instructs the coating equipment to perform an additional coating operation; if the film thickness is above 1.0 μm, it automatically reduces the traction speed of the inner tubing 1 through the coating area by 0.5 m / min, thereby reducing the coating amount.

[0037] The present invention, through the above-mentioned closed-loop control method of real-time detection, dynamic feedback and automatic adjustment, can effectively overcome the fluctuations in the production process, improve the pass rate of the surface treatment effect of the PE inner layer hose 1, and strictly control the fluctuation of its final bonding strength with epoxy resin within a certain range, thereby improving the consistency and reliability of product quality.

[0038] Example 3 Based on the above embodiment 2, this embodiment 3 further provides a manufacturing system for the dry tube assembly, which mainly includes an inner layer hose forming device, a cooling device, an outer layer strip braiding device, and a winding device.

[0039] An inner tube forming apparatus is used to extrude molten rubber material to form an inner tube 1. The apparatus includes an extruder that extrudes molten rubber-plastic material to form the inner tube 1. The extruder for producing the inner tube 1 can be a co-extrusion extruder, which can inject rubber material into the feed port on only one side of the extrusion port, while leaving the feed port on the other side empty. Alternatively, an extruder that only extrudes rubber material on one side to form the inner tube 1 can also be used.

[0040] A cooling device is used to cool the inner tubing 1 extruded by the inner tubing forming device. Specifically, the cooling device includes a first cooling unit and a second cooling unit arranged sequentially along the travel direction of the inner tubing 1. The first cooling unit is a first hot water bath containing hot water maintained at a temperature of 60°C to 80°C. The inner tubing 1 is first immersed in the first hot water bath for initial cooling by the hot water, with a residence time controlled between 5 and 10 seconds, to achieve initial shaping and prevent tubing deformation. A second cooling unit is arranged immediately following the first cooling unit. The second cooling unit is a second cold water bath containing cold water maintained at a temperature of 20°C to 30°C. The initially shaped inner tubing 1 is then immersed in the second cold water bath for a second stage of cooling, with a residence time controlled between 10 and 15 seconds. Through the combined action of the first and second cooling units, the cooling device can control the overall average cooling rate of the inner tubing 1 within the range of 5°C / s to 8°C / s. The system also integrates a temperature sensor and control system to monitor the surface temperature of the inner tubing 1 in real time after it leaves the second cooling unit, and to ensure that its surface temperature is stable in the optimal range of 35°C to 45°C by adjusting the water temperature or traction speed, so as to prepare for the subsequent instant weaving process.

[0041] The outer layer strip braiding device is used to braid the outer layer strip 4 on the outside of the cooled inner layer rubber tube 1. The outer layer strip braiding device includes a circular loom 3. After the inner layer rubber tube 1 is cooled, it is directly drawn into the circular loom 3 to braid the outer layer strip 4 without being wound up.

[0042] The winding device is used to manufacture the tube assembly rolls in the factory. The winding device winds the nested outer strip blank 4 and inner hose 1 assembly into a roll assembly. The winding is formed by winding rollers, and an automatic line laying system is equipped to ensure that the tube assembly is evenly distributed on the roll, forming a standardized roll assembly with a compact structure, no cross deformation, and easy transportation and storage.

[0043] In a preferred embodiment, the manufacturing system further includes a surface modification device disposed between the cooling device and the outer layer fabric weaving device. This surface modification device is used to continuously modify the outer surface of the cooled and shaped inner layer tubing 1 online to improve its adhesion to the subsequently impregnated epoxy resin. Specifically, the surface modification device includes a mechanical roughening device, a grafting modification device, and a primer treatment device connected in sequence.

[0044] The mechanical roughening device is an online sandblasting equipment with a sealed processing chamber. This device is equipped with an abrasive supply unit capable of uniformly sandblasting the outer surface of the inner tubing 1 for 10 to 20 seconds with 80-120 mesh brown corundum abrasive particles at a sandblasting air pressure of 0.3 MPa to 0.5 MPa, with the distance between the sandblasting gun nozzle and the outer surface of the inner tubing 1 being 15 cm to 25 cm. This results in an arithmetic mean surface roughness Ra of 1.5 μm to 2.5 μm.

[0045] The grafting modification device is located downstream of the mechanical roughening device and includes a plasma treatment unit and a grafting reaction unit arranged sequentially. The plasma treatment unit can generate a low-temperature plasma with a power of 300W to 500W in an argon atmosphere to pretreat the outer surface of the moving inner tubing 1 for 5 to 8 seconds. The grafting reaction unit is equipped with a grafting liquid spraying mechanism and a temperature-controlled reaction channel, which can uniformly apply a maleic anhydride ethanol solution with a concentration of 5wt% to 10wt% to the pretreated tubing surface and maintain it at 60℃ to 80℃ for 15 to 30 minutes to complete the grafting reaction, stabilizing the grafting rate at 1.2wt% to 2.0wt%.

[0046] The primer treatment device is located downstream of the grafting modification device and includes a precision coating unit and a curing unit. The precision coating unit can be a micro-quantity spraying system used to uniformly coat the surface of the inner tubing 1 with a polyolefin primer containing 5 wt% to 8 wt% maleic anhydride (solvent: xylene:ethanol = 3:1) at a wet film thickness of 0.5 μm to 1.0 μm. The subsequent curing unit is a low-temperature drying tunnel capable of curing the coating at 60°C to 70°C for 10 to 15 minutes, forming a stable primer coating.

[0047] In a preferred embodiment, please refer to Figure 5 The surface modification unit is also equipped with an online surface quality closed-loop control system. This system, by installing online detection sensors at key process points and linking them with the central controller and actuators, enables real-time monitoring and dynamic adjustment of surface modification process parameters. The closed-loop control system includes the following units: 1. Online Roughness Control Unit: Located after the mechanical roughening device, this unit includes a laser roughness meter. The laser roughness meter is aimed at the outer surface of the inner rubber tube 1 after sandblasting and measures its arithmetic mean roughness Ra value in real time. The measured data is transmitted to the central controller in real time. The central controller has a preset target range for Ra of 1.5 μm to 2.5 μm. If the measured Ra value is lower than 1.5 μm, the controller sends a command to the air pressure regulating valve of the sandblasting device to increase the sandblasting pressure by 0.05 MPa; if the measured Ra value is higher than 2.5 μm, the controller commands to decrease the sandblasting pressure by 0.05 MPa, thereby achieving stable roughness control.

[0048] 2. Online Grafting Rate Control Unit: Located after the grafting modification device, this unit includes an online Fourier transform infrared spectrometer (FTIR) that scans the outer surface of the treated inner tubing 1, monitors the intensity of the maleic anhydride characteristic peak in real time, and calculates the grafting rate. The calculated and measured grafting rate is fed back to the central controller in real time. The controller has a preset target grafting rate range of 1.2 wt% to 2.0 wt%. If the grafting rate is below 1.2 wt%, the controller automatically extends the process time of the plasma grafting reaction unit by 5 minutes; if it is above 2.0 wt%, it automatically shortens the process time by 5 minutes.

[0049] 3. Online Film Thickness Control Unit: Located after the coating unit of the primer treatment device, this unit includes an online film thickness gauge that measures the thickness of the wet primer film in real time. The measured film thickness value is transmitted to the central controller. The controller has a preset target film thickness range of 0.5μm to 1.0μm. If the film thickness is below 0.5μm, the controller will instruct the precision coating unit of the primer treatment device to perform an additional coating operation; if the film thickness is above 1.0μm, it will automatically reduce the traction speed of the inner tube 1 through the coating area by 0.5m / min to reduce the coating amount.

[0050] The surface modification unit integrates online detection and execution units, and uses a central controller to perform closed-loop logic operations, forming an intelligent production process. It proactively responds to fluctuations in raw materials and equipment, ensuring that the surface treatment effect at each step remains stable within the optimal parameter window, thereby guaranteeing a high degree of consistency and reliability in the bonding performance of the final dry pipe assembly product.

[0051] Example 4 Please refer to Figure 6 The pipeline repair construction method involved in this invention includes the following steps: a) Dry pipe assembly manufacturing: A dry pipe assembly roll is manufactured using the dry pipe assembly manufacturing method of the above embodiment; b) On-site unwinding of main pipe: Unwinding the main pipe assembly roll at the construction site; c) Glue injection: Insert the injection needle of the glue injection device between the inner rubber tube 1 and the outer strip blank 4 of the unwound dry tube assembly to inject glue; d) Pressing: Use a pressing roller to press the glued dry tube assembly so that the glue is evenly distributed between the inner tube 1 and the outer strip blank 4 of the dry tube assembly. e) Pulling in: Pull the dry pipe assembly that has been treated with adhesive sealant from the inlet end of the pipe to be repaired toward the outlet end; f) Pressure bonding: After pulling the main pipe assembly into the pipe to be repaired, pressurized fluid is injected into the main pipe to make the pipe open and bond to the inner wall of the pipe to be repaired. g) Curing: The dry pipe assembly that has been stretched and attached to the inner wall of the pipe to be repaired is cured, so that the adhesive between the inner rubber tube 1 and the outer strip blank 4 penetrates into the inner wall of the pipe to be repaired and cures and bonds, thereby bonding the inner rubber tube 1, the outer strip blank 4 and the inner wall of the pipe to be repaired into one piece.

[0052] In step f), the pressurized fluid injected into the inner cavity of the main pipe assembly is either compressed air or water. During the pipe expansion process, the pressure is maintained at 0.1-0.2 MPa for half an hour to allow the main pipe assembly to expand and completely adhere to the original pipe wall.

[0053] In step g), curing is performed using thermosetting, light curing, microwave curing, or room temperature curing. Thermosetting, light curing, and microwave curing require curing equipment, specifically a hot fluid curing device, a light curing device, or a microwave curing device, respectively. Room temperature curing does not require any curing equipment. Thermosetting involves injecting hot water or steam into the inner cavity of the expanded dry pipe assembly for heating and curing. Light curing can be ultraviolet (UV) curing, where a curing device equipped with a UV lamp travels through the inner cavity of the expanded dry pipe assembly and irradiates the inner wall of the pipe. The UV light penetrates the inner tubing 1 (which is thin enough for UV light to penetrate) to cure the resin. Alternatively, a microwave curing device can be used to cure the injected resin. Room temperature curing involves allowing the expanded dry pipe to cure naturally. The curing process allows the adhesive between the inner tubing 1 and the outer strip 4 to penetrate into the inner wall of the pipe to be repaired and solidify, thus bonding the inner tubing 1, the outer strip 4, and the inner wall of the pipe to be repaired into a single unit. For light curing, use a power of 400W-24KW and an irradiation time of 0.05-1.5 hours. For heat curing, use a pressure of 0.1-0.2MPa and a temperature of 80℃ for 2-4 hours. After curing, maintain pressure and let stand for 8-12 hours to ensure complete curing.

[0054] Multiple curing methods (thermal curing, light curing, microwave curing, and room temperature curing) provide ample process options to adapt to different construction environments and pipe material requirements. Thermal curing uses 80℃ temperature and a curing time of 2-4 hours, while light curing uses 400W-24KW power and an irradiation time of 0.05-1.5 hours, ensuring complete resin curing. A double pressure-holding measure of 8-12 hours after curing guarantees a strong and lasting bond between the repair layer and the pipe to be repaired.

[0055] Example 5 This invention also relates to a pipeline repair construction system for implementing the construction method described in the above embodiments, comprising: The manufacturing system for the dry hose assembly, as described in the above embodiments, mainly includes an inner hose forming device, a cooling device, an outer strip braiding device, and a winding device. Unwinding device, used to unwind the drum of the main pipe assembly at the construction site; The glue injection device is used to inject glue between the inner rubber tube 1 and the outer strip blank 4 of the unwound dry tube assembly. The adhesive pressing device includes an adhesive pressing roller assembly for pressing the glued dry tube assembly to distribute the glue evenly. A traction device is used to pull the dry pipe assembly that has been pressed with adhesive from the inlet end of the pipe to be repaired toward the outlet end, so that the dry pipe assembly is inserted into the pipe to be repaired. A pipe support device is used to inject pressurized fluid into the inner cavity of the main pipe assembly, causing the main pipe assembly to be stretched and fit against the inner wall of the pipe to be repaired.

[0056] The main pipe assembly manufacturing system is located in the factory, where the relevant operations are completed to manufacture the main pipe assembly rolls, preparing for subsequent on-site construction work.

[0057] At the pipeline repair construction site, after the pipeline to be repaired is cleaned by high-pressure water jet, a hydraulically driven or electrically controlled unwinding device is used to unwind the dry pipe assembly roll prepared in the factory. The guide and correction device ensures that the dry pipe assembly is unfolded smoothly, avoiding twisting, wrinkling or surface damage, and providing a continuous and stable material supply for subsequent glue injection and pull-in processes.

[0058] The glue injection device is used to inject glue between the inner tubing 1 and the outer strip blank 4 of the unwound dry tube assembly. The glue injection device includes injection needles. After the dry tube assembly is unwound at the construction site, glue injection is performed using the glue injection device equipped with several injection needles. The number of injection needles is determined according to the diameter of the dry tube assembly and is evenly distributed on the upper and lower surfaces of the dry tube assembly. During glue injection, the injection needles are inserted through the braided gaps of the outer strip blank 4 between the outer strip blank 4 and the inner tubing 1. Generally, resin is used as the glue liquid. The flowability of the selected resin is matched with the tightness of the outer strip blank 4 to ensure that the resin does not leak out of the outer strip blank 4 during injection. Specifically, the resin used for glue injection can be CC2013 resin.

[0059] This invention employs an injection needle design with needles evenly distributed on both the upper and lower surfaces, ensuring uniform resin distribution within the cavity between the outer layer preform 4 and the inner layer tubing 1, thus avoiding incomplete filling issues that may occur with unilateral injection. The intelligent configuration of the needle quantity based on the nozzle diameter ensures injection efficiency while avoiding resource waste, achieving precise injection. The combination of resin flowability and the tightness of the outer layer preform 4 prevents resin leakage, ensuring a clean and efficient injection process. This injection method not only improves construction quality and ensures uniform and complete resin filling but also significantly reduces resin consumption, lowering material costs compared to the traditional flipping method.

[0060] The pressure-pressing device is used to compact the glued dry tube assembly to ensure uniform glue distribution. The device includes multiple pairs of pressure rollers, each pair forming a group. The glued dry tube assembly passes between each pair of rollers and is flattened, resulting in uniform glue distribution between the outer strip 4 and the inner tube 1. After glue injection is initiated, the pressure rollers are used to roll and press the resin-filled dry tube assembly, ensuring uniform resin distribution within the cavity between the outer strip 4 and the inner tube 1. Due to the high density of the outer strip 4, an effective sealing barrier is formed during the pressure-pressing process. Since the resin is relatively viscous at room temperature, this ensures no resin leakage after pressure-pressing. This invention uses pressure rollers for rolling, ensuring uniform resin distribution within the cavity between the outer strip 4 and the inner tube 1 while avoiding damage to the dry tube assembly due to excessive pressure. This pressure bonding method allows the resin to be continuously and evenly distributed within the cavity, providing ideal conditions for subsequent curing processes and significantly improving the integrity and durability of the repair layer.

[0061] A traction device is used to pull the glued dry pipe assembly from the inlet end to the outlet end of the pipe to be repaired, thus allowing the dry pipe assembly to be inserted into the pipe. The pipe to be repaired has an inlet end and an outlet end at its two ends. The traction device is located at the outlet end, and its traction end is connected to the end of the dry pipe assembly. It is used to pull the glued dry pipe assembly from the inlet end and through the pipe to be repaired, finally reaching the outlet end. Before pulling it in, the end of the dry pipe assembly should be tightened or sealed to prevent glue leakage between the inner rubber tube 1 and the outer strip blank 4. Alternatively, the dry pipe assembly can be folded U-shaped to facilitate pulling it in.

[0062] The pipe-stretching device is used to inject pressurized fluid into the main pipe assembly, causing the pipe to expand and conform to the inner wall of the pipe to be repaired. An outlet plug with a drain port is installed at the outlet end of the main pipe assembly of the pipe to be repaired; an inlet plug with an inlet port is installed at the inlet end of the main pipe assembly of the pipe to be repaired. Pressurized fluid can be injected through the inlet port to expand the pipe. The pressurized fluid can be compressed air or water. If water is injected, it is drained through the drain port before subsequent curing. Specifically, during the pipe-stretching process, pressure is maintained at 0.1-0.2 MPa for half an hour to allow the U-shaped main pipe assembly to expand and completely conform to the original pipe wall. This invention uses pressurized fluid for pipe-stretching, ensuring that the main pipe assembly fully expands and conforms to the inner wall of the pipe to be repaired.

[0063] It should be noted that the pipe support device is also equipped with an intelligent pressure maintenance system, including an intelligent pressure maintenance device, a control module, and a regulating valve, to achieve precise pressure control. The multi-functional integrated design of the intelligent pressure maintenance system of this invention meets the needs of different working conditions, significantly improving the applicability of the equipment; precise pressure control ensures uniform adhesion of the repair layer, significantly improving the consistency of curing quality and peel strength. It effectively eliminates air between the repair lining and the interlayer of the pipe to be repaired, ensuring complete adhesion and significantly improving the integrity and durability of the repair layer.

[0064] To cure the adhesive injected into the main pipe assembly, the main pipe assembly, which has been stretched and bonded to the inner wall of the pipe to be repaired, can be cured using heat curing, light curing, microwave curing, or room temperature curing methods. Heat curing, light curing, and microwave curing require curing equipment, specifically a hot fluid curing device, a light curing device, or a microwave curing device, respectively. Room temperature curing does not require any curing equipment. Heat curing involves injecting hot water or steam into the inner cavity of the stretched main pipe assembly for heating and curing. Light curing can be ultraviolet (UV) curing, where a curing device equipped with a UV lamp travels through the inner cavity of the stretched main pipe assembly and irradiates the inner wall of the pipe. The UV light penetrates the inner adhesive tube 1 (which is thin enough for UV light to penetrate) to cure the resin. Microwave curing can also be used to cure the injected resin. Room temperature curing involves allowing the main pipe to stand and cure naturally after it has been stretched. The curing process allows the adhesive between the inner tubing 1 and the outer strip 4 to penetrate into the inner wall of the pipe to be repaired and solidify, thus bonding the inner tubing 1 and outer strip 4 of the dry pipe assembly to the inner wall of the pipe to be repaired as a single unit. For light curing, the power is 400W-24KW, and the irradiation time is 0.05-1.5 hours. For heat curing, a pressure of 0.1-0.2MPa and a temperature of 80℃ are used, with a curing time of 2-4 hours. After curing, the pipe is held under pressure for 8-12 hours to ensure complete curing.

[0065] Multiple curing methods (thermal curing, light curing, microwave curing, and room temperature curing) provide ample process options to adapt to different construction environments and pipe material requirements. Thermal curing uses 80℃ temperature and a curing time of 2-4 hours, while light curing uses 400W-24KW power and an irradiation time of 0.05-1.5 hours, ensuring complete resin curing. A double pressure-holding measure of 8-12 hours after curing guarantees a strong and lasting bond between the repair layer and the pipe to be repaired.

[0066] The preferred embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, nor is it limited to main pipe assemblies and their manufacturing methods, construction methods, and systems. Equipment and structures not described in detail herein should be understood as being implemented in a manner common to the art. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention, using the disclosed technical content. This does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, still fall within the protection scope of the present invention.

Claims

1. A trunking assembly, characterized in that, include: The inner tubing is formed from rubber and plastic material through an extrusion process. The rubber and plastic material is either PE or TPU. The outer strip preform is nested on the outside of the inner tubing. The outer layer preform is woven on the outside of the inner layer tubing by a circular loom, and the inner surface of the outer layer preform and the outer surface of the inner layer tubing can be separated, forming a cavity between the outer layer preform and the inner layer tubing to accommodate resin.

2. A method for manufacturing a trunking assembly as described in claim 1, characterized in that, Includes the following steps: S1 Inner Tube Fabrication: Molten rubber is extruded using an extruder to form the inner tube; S2 cooling: The inner rubber hose is cooled by a cooling device; S3 Braided Outer Layer Strip Blank: The inner layer rubber tube is drawn into the inlet of the circular loom, and the circular loom braids the outer layer strip blank on the outside of the inner layer rubber tube. S4 winding: The nested outer strip blank and inner hose are wound into a roll for the dry hose assembly.

3. The manufacturing method according to claim 2, characterized in that, After cooling in step S2 and before braiding the outer layer strip in step S3, the process further includes a surface modification step on the outer surface of the inner layer tubing. The surface modification includes: S2a Mechanical polishing: Mechanical roughening treatment is applied to the outer surface of the inner tubing. S2b grafting modification: Grafting treatment is performed on the roughened outer surface, and compounds containing polar functional groups are grafted onto the polymer surface of the inner tubing through chemical reaction or high-energy irradiation.

4. The manufacturing method according to claim 3, characterized in that, Following step S2b grafting modification, the following steps are also included: S2c Primer Treatment: A primer containing an epoxy resin adhesion promoter is applied to the grafted modified outer surface.

5. The manufacturing method according to claim 3, characterized in that, In step S2a, the mechanical roughening treatment is sandblasting, using 80-120 mesh brown corundum abrasive particles, with the sandblasting pressure controlled at 0.3-0.5 MPa and the sandblasting distance controlled at 15-25 cm.

6. The manufacturing method according to claim 3, characterized in that, In step S2b, the grafting modification is plasma-induced grafting, specifically including: S2b-1 plasma pretreatment: Treat for 5-8 seconds under a low-temperature plasma in an argon atmosphere with a power of 300-500W; S2b-2 grafting reaction: The pretreated pipe is immersed in a 5-10 wt% maleic anhydride ethanol solution and subjected to plasma-induced grafting reaction at 60-80℃ for 15-30 minutes, with the grafting rate controlled at 1.2-2.0 wt%.

7. The manufacturing method according to claim 4, characterized in that, In step S2c, a primer is coated on the grafted modified outer surface. The primer is a polyolefin solution containing 5-8 wt% maleic anhydride, and the solvent is a mixture of xylene and ethanol in a volume ratio of 3:

1. The thickness of the primer film is controlled to be 0.5-1.0 μm, and it is cured at 60-70℃ for 10-15 minutes.

8. The manufacturing method according to claim 2, characterized in that, The inner tubing is made of thermoplastic polyurethane (TPU); step S2 cooling specifically involves gradient cooling, including: The extruded inner tubing is first immersed in a hot water bath at 60-80℃ for 5-10 seconds, and then immersed in a cold water bath at 20-30℃ for 10-15 seconds, with the cooling rate controlled at 5-8℃ / second. After gradient cooling, the surface temperature of the inner rubber tube is controlled between 35-45℃, and within 30 seconds after the cooling is completed, it is drawn into the circular loom for the outer strip blank weaving in step S3.

9. The manufacturing method according to claim 3 or 4, characterized in that, Both the mechanical roughening treatment and grafting modification steps are controlled in a closed-loop manner, specifically including: S2a-1 Online Roughness Control: After mechanical roughening treatment, the roughness of the outer surface of the inner tubing is detected online; if the detected value is lower than the first preset threshold, the intensity parameter of the roughening treatment is automatically increased; if the detected value is higher than the second preset threshold, the intensity parameter is automatically decreased. S2b-1 Grafting Rate Online Control: After grafting modification treatment, the grafting rate on the outer surface of the inner tubing is detected online; if the detected value is lower than the third preset threshold, the grafting reaction time parameter is automatically extended; if the detected value is higher than the fourth preset threshold, the time parameter is automatically shortened.

10. The manufacturing method according to claim 4, characterized in that, The primer treatment process employs closed-loop control, specifically including: S2c-1 Online film thickness control: After the primer treatment, the film thickness of the primer is detected online; if the detected value is lower than the fifth preset threshold, the coating amount is automatically increased; if the detected value is higher than the sixth preset threshold, the coating amount is automatically reduced.

11. A manufacturing system for a trunking assembly, characterized in that, A method for manufacturing the trunking assembly according to claim 2, comprising: Inner tube forming device, used to extrude molten rubber to form inner tube; Cooling device for cooling the inner rubber hose; The outer layer strip braiding device is used to braid the outer layer strip blank on the outside of the inner layer tubing; A winding device is used to wind nested outer strip blanks and inner tubing into a roll assembly.

12. A pipeline repair construction method, characterized in that, Includes the following steps: a) Manufacturing of the trunking assembly: The trunking assembly roll is manufactured using the manufacturing method of the trunking assembly according to claim 2; b) On-site unwinding of main pipe: Unwinding the main pipe assembly roll at the construction site; c) Glue injection: Insert the injection needle of the glue injection device between the inner rubber tube and the outer strip blank of the unwound dry tube assembly to inject glue; d) Pressing: Use a pressing roller to press the glued dry tube assembly so that the glue is evenly distributed between the inner tube and the outer strip blank of the dry tube assembly. e) Pull in: Pull the dry pipe assembly that has been treated with adhesive sealant from the inlet end of the pipe to be repaired toward the outlet end; f) Pressure bonding: After dragging the main pipe assembly into the pipe to be repaired, pressurized fluid is injected into the inner cavity of the main pipe assembly to make the main pipe assembly open and bond to the inner wall of the pipe to be repaired. g) Curing: The dry pipe assembly that has been stretched and attached to the inner wall of the pipe to be repaired is cured, so that the adhesive between the inner rubber tube and the outer strip blank penetrates into the inner wall of the pipe to be repaired and cures and bonds, thereby bonding the inner rubber tube, the outer strip blank and the inner wall of the dry pipe assembly to the inner wall of the pipe to be repaired into one piece.

13. A pipeline repair construction system for implementing the construction method of claim 12, characterized in that, include: The manufacturing system for the hose assembly includes an inner hose forming device, a cooling device, an outer strip braiding device, and a winding device; Unwinding device, used to unwind the drum of the main pipe assembly at the construction site; The glue injection device is used to inject glue between the inner rubber tube and the outer strip blank of the unwound dry tube assembly; The adhesive pressing device includes an adhesive pressing roller for pressing the glued dry tube assembly to distribute the glue evenly. A traction device is used to pull the dry pipe assembly that has been pressed with adhesive from the inlet end of the pipe to be repaired toward the outlet end, so that the dry pipe assembly is inserted into the pipe to be repaired. A pipe support device is used to inject pressurized fluid into the inner cavity of the main pipe assembly, causing the main pipe assembly to be stretched and fit against the inner wall of the pipe to be repaired. The curing device is used to cure the dry pipe assembly that has been stretched and adhered to the inner wall of the pipe to be repaired.

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