Dry pipe assembly and method of manufacturing, installing and servicing same

Abstract

The application discloses a dry pipe assembly and a manufacturing method, construction method and system thereof. The dry pipe assembly comprises an inner rubber tube formed by an extrusion process, and an outer layer tape blank woven on the outer side of the inner rubber tube by a circular weaving machine and detachably arranged on the inner surface, and a cavity for accommodating resin is formed between the inner rubber tube and the outer layer tape blank. The manufacturing method comprises the steps of extruding the inner rubber tube, gradient cooling, surface modification, weaving the outer layer tape blank and winding, the surface modification covers sand blasting, plasma-induced maleic anhydride grafting and epoxy primer treatment, and closed-loop control is adopted in the surface modification and primer treatment processes. The manufacturing system comprises forming, cooling, weaving and winding devices. The pipeline repair construction is performed through the following operations: dry pipe unwinding, glue injection, glue pressing, dragging into the pipeline to be repaired, pressure fitting and curing, so that the dry pipe assembly is integrated with the inner wall of the pipeline. Through the optimized structure design and process, the adhesion reliability of the dry pipe assembly and the pipeline is improved, and the quality and construction efficiency of the pipeline repair are ensured.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of pipeline trenchless repair, and particularly relates to a dry pipe assembly and a manufacturing method, construction method and system thereof, which are mainly applied to structural repair engineering of underground pipelines such as water supply and drainage, petrochemical industry and municipal pipe network. BACKGROUND

[0002] Traditional dry pipe assemblies mostly adopt a structure of simply combining a fiber woven belt blank with a sealing layer, and the interface bonding thereof mainly depends on physical fitting or a general adhesive, which has problems of insufficient bonding strength, poor medium resistance and easy interface delamination during long-term use. Especially when the transported medium is corrosive or the pressure in the pipe fluctuates frequently, the simple mechanical combination mode is difficult to effectively resist the synergistic effect of stress concentration and chemical corrosion, resulting in premature failure of the repair layer and restricting the popularization and application in the field of pipeline repair.

[0003] Traditional manufacturing processes usually adopt a segmented operation, that is, the sealing rubber pipe is first independently produced and wound, and then transferred to another site for outer layer belt blank weaving. This process involves multiple winding and unwinding operations, which not only has low efficiency, but also easily causes surface contamination, mechanical damage or size deformation of the sealing rubber pipe. For non-polar polymer materials such as PE, the chemical compatibility of their surface with epoxy resin is poor, and the traditional process relies on empirical parameters for roughening or priming treatment, which leads to significant batch differences in the bonding performance of the product, and the qualified rate is generally low, which cannot guarantee the reliability of the repair engineering.

[0004] Existing equipment mostly relies on manual sampling detection and offline adjustment, which has a lagging response and cannot compensate for the deviation caused by fluctuations in raw materials or changes in equipment state in real time. This open-loop control mode leads to poor stability of the production process and difficulty in ensuring the consistency of product quality, which has become a prominent technical obstacle restricting the large-scale and standardized production of high-performance dry pipe assemblies. Therefore, it is urgent to develop a manufacturing system that can realize online quality control throughout the process and ensure high stability of product performance. SUMMARY

[0005] The purpose of the present application is to provide a dry pipe assembly and a manufacturing method, construction method and system thereof, which are used to solve the problems of insufficient interface bonding strength of the dry pipe assembly in the prior art, large quality fluctuations caused by discrete production process, and lack of online quality control means.

[0006] The first purpose of the present application is to provide a dry pipe assembly, which comprises:

[0007] An inner rubber pipe formed by an extrusion process from an elastoplastic material, the elastoplastic material being a PE material or a TPU material, and an outer belt blank nested on the outside of the inner rubber pipe;

[0008] The outer layer strip blank is woven by a circular weaving machine outside the inner layer rubber tube, and the inner surface of the outer layer strip blank and the outer surface of the inner layer rubber tube are arranged separately, so that resin can be injected between the outer layer strip blank and the inner layer rubber tube in the subsequent process, and a cavity for accommodating resin is formed between the outer layer strip blank and the inner layer rubber tube.

[0009] The preparation process of the dry pipe assembly is completed in the factory, and the pipe repair construction process includes the following operation steps:

[0010] Dry pipe on-site unwinding: unwinding the winding drum of the dry pipe assembly at the construction site;

[0011] Glue injection: inserting the injection needle of the glue injection device between the inner layer rubber tube and the outer layer strip blank of the unwound dry pipe assembly to inject glue;

[0012] Glue pressing: using a glue pressing roller to press the glued dry pipe assembly, so that the glue is uniformly distributed between the inner layer rubber tube and the outer layer strip blank of the dry pipe assembly;

[0013] Dragging: dragging the glue-pressed dry pipe assembly into the repaired pipe from the inlet end to the outlet end;

[0014] Pressurized fitting: after the dry pipe assembly is dragged into the repaired pipe, a pressure fluid is injected into the inner cavity of the dry pipe assembly to make the dry pipe assembly be expanded and fitted to the inner wall of the repaired pipe;

[0015] Curing: curing the dry pipe assembly that has been expanded and fitted to the inner wall of the repaired pipe, so that the glue between the inner layer rubber tube and the outer layer strip blank penetrates into the inner wall of the repaired pipe and solidifies and bonds, thereby bonding the inner layer rubber tube, the outer layer strip blank and the inner wall of the repaired pipe into one body.

[0016] The second invention of the present application aims to provide a dry pipe assembly manufacturing method for manufacturing the above-mentioned dry pipe assembly, comprising the following steps:

[0017] S1: manufacturing an inner layer rubber tube: extruding molten glue through an extruder to form an inner layer rubber tube;

[0018] S2: cooling: cooling the inner layer rubber tube through a cooling device;

[0019] S3: weaving an outer layer strip blank: drawing the inner layer rubber tube into the inlet of a circular weaving machine, and weaving an outer layer strip blank outside the inner layer rubber tube by the circular weaving machine;

[0020] S4: winding: winding the nested outer layer strip blank and inner layer rubber tube into a winding drum of a dry pipe assembly.

[0021] The third invention of the present application aims to provide a dry pipe assembly manufacturing system for implementing the above-mentioned dry pipe assembly manufacturing method, comprising:

[0022] An inner tube forming device for extruding molten rubber to form an inner tube;

[0023] A cooling device for cooling the inner tube;

[0024] An outer tape weaving device for weaving an outer tape on the outside of the inner tube;

[0025] A winding device for winding the nested outer tape and inner tube into a winding assembly.

[0026] The fourth object of the present application is to provide a pipeline repair construction method, comprising:

[0027] a) Dry pipe assembly manufacturing: manufacturing a winding assembly of a dry pipe assembly by using the manufacturing method of the dry pipe assembly of claim 1;

[0028] b) Dry pipe on-site unwinding: unwinding the winding assembly of the dry pipe assembly at the construction site;

[0029] c) Glue injection: inserting the injection needle of the glue injection device between the inner tube and the outer tape of the unwound dry pipe assembly for glue injection;

[0030] d) Glue pressing: pressing the glued dry pipe assembly with a glue pressing roller to make the glue evenly distributed between the inner tube and the outer tape of the dry pipe assembly;

[0031] e) Dragging in: dragging the glue-pressed dry pipe assembly into the pipeline to be repaired from the inlet end to the outlet end;

[0032] f) Pressurized fitting: after the dry pipe assembly is dragged into the pipeline to be repaired, injecting a pressure fluid into the inner cavity of the dry pipe assembly to make the dry pipe assembly expand and fit the inner wall of the pipeline to be repaired;

[0033] g) Curing: curing the dry pipe assembly that has been expanded and fitted to the inner wall of the pipeline to be repaired, so that the glue between the inner tube and the outer tape penetrates into the inner wall of the pipeline to be repaired and solidifies and bonds, thereby bonding the inner tube, the outer tape and the inner wall of the pipeline to be repaired into one body.

[0034] The fifth object of the present application is to provide a pipeline repair construction system, comprising:

[0035] A dry pipe assembly manufacturing system comprising an inner tube forming device, a cooling device, an outer tape weaving device, and a winding device;

[0036] An unwinding device for unwinding the winding assembly of the dry pipe assembly at the construction site;

[0037] A glue injection device for injecting glue between the inner tube and the outer tape of the unwound dry pipe assembly;

[0038] The adhesive pressing device includes an adhesive pressing roller for pressing the glued dry tube assembly to distribute the glue evenly.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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:

[0043] (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.

[0044] (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.

[0045] (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

[0046] 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.

[0047] Figure 1 Flow chart of the manufacturing method of the dry pipe assembly in the embodiment of the present application;

[0048] Figure 2 Schematic diagram of the outer layer tape blank woven on the inner tube by the circular weaving machine in the embodiment of the present application;

[0049] Figure 3 Flow chart of the manufacturing method of the dry pipe assembly in the embodiment of the present application, with the step of surface modification treatment;

[0050] Figure 4 Schematic diagram of the cross section of the dry pipe assembly;

[0051] Figure 5 Flow chart of the manufacturing method of the dry pipe assembly in the embodiment of the present application, with the steps of surface modification treatment and closed loop control;

[0052] Figure 6 Flow chart of the pipe repair construction method in the embodiment of the present application.

[0053] Explanation of the reference numerals: 1 - inner tube; 2 - hole; 3 - circular weaving machine; 4 - outer layer tape blank; 5 - yarn. DETAILED DESCRIPTION

[0054] In the following description, a large number of specific details are given to provide a more thorough understanding of the present application. However, it is apparent to those skilled in the art that the present application can be implemented without one or more of these details. In other cases, some technical features known to the art are not described in order to avoid obscuring the present application.

[0055] In order to thoroughly understand the present application, detailed steps and detailed structures will be presented in the following description in order to explain the technical solutions of the present application. The preferred embodiment of the present application is described in detail as follows, however, in addition to these detailed descriptions, the present application can also have other embodiments.

[0056] Embodiment 1

[0057] Please refer to Figure 4The dry pipe assembly of the present application is composed of an inner rubber tube 1 and an outer layer strip blank 4, the outer layer strip blank 4 is nested outside the inner rubber tube 1, the inner surface of the outer layer strip blank 4 is separably arranged with the outer surface of the inner rubber tube 1, so that the subsequent injection of glue between the outer layer strip blank 4 and the inner rubber tube 1 can be realized; the rubber and plastic material is formed into the inner rubber tube 1 through the extrusion process, and the outer layer strip blank 4 can be woven on the outside of the inner rubber tube 1 by a circular weaving machine 3. The preparation process of the dry pipe assembly is completed in the factory, the corresponding rubber and plastic particles are selected according to the conveying medium, and the rubber and plastic material can be selected from materials including but not limited to PE material, TPU material and the like. If PE material is selected as the material for forming the inner rubber tube 1, the PE material extrusion temperature is 190-220℃, and hot melt glue particles can be optionally added to increase the adhesion. TPU material is the abbreviation of Thermoplastic Polyurethane Elastomer, which belongs to a kind of high polymer material with very balanced performance, and has double characteristics between plastic and rubber. Common TPU materials include polyester TPU, polyether TPU, polycaprolactone TPU, etc. If TPU material is selected as the material for forming the inner rubber tube 1, the related parameters can be set as follows: TPU particle extrusion temperature 180-195℃, extrusion pressure <15MPa, extrusion speed 8-20m / h. The inner rubber tube 1 provides medium resistance, and the fluid medium flows through it. The outer layer strip blank 4 is nested outside the inner rubber tube 1. The outer layer strip blank 4 is woven on the outside of the inner rubber tube 1 by the circular weaving machine 3, and the yarn 5 is woven through the hole 2 of the circular weaving machine 3. The outer layer strip blank 4 has high weaving tightness, and the glue injected between the inner rubber tube 1 and the outer layer strip blank 4 is relatively viscous when not heated, and is not easy to penetrate the outer layer strip blank 4 and penetrate to the outer surface of the outer layer strip blank 4.

[0058] The inner rubber tube 1 can be extruded by an extruder in the temperature range of 190-220℃ / 180-195℃ using PE or TPU material, the inner rubber tube 1 provides excellent medium resistance to ensure safe delivery of fluid medium. The outer layer strip blank 4 is precisely woven by the circular weaving machine 3 and has high strength, which can withstand high pressure. The overall structure of the inner rubber tube 1 is highly adaptable, and the material can be flexibly selected according to the characteristics of the conveying medium to meet different working condition requirements. The use of this inner rubber tube 1 to repair the pipeline can significantly prolong the service life of the pipeline, and provides a reliable and economical solution for pipeline repair under long-distance and high-pressure working conditions.

[0059] Example 2

[0060] Please refer to Figure 1 and Figure 2 The manufacturing method of the dry pipe assembly of the present application mainly includes the following steps:

[0061] S1: Making an inner rubber tube: extruding molten glue through an extruder to form an inner rubber tube 1;

[0062] S2 cooling: cooling the inner tube 1 through a cooling device;

[0063] S3 braiding outer layer band blank: drawing the inner tube 1 into the guide inlet of the circular braiding machine 3, and the circular braiding machine 3 braids to form an outer layer band blank 4 on the outer side of the inner tube 1;

[0064] S4 winding: winding the nested outer layer band blank 4 and inner tube assembly into a dry tube assembly roll.

[0065] Through the above method, a high-quality dry tube assembly roll can be conveniently manufactured, which is used for the injection type insertion hose lining repair technology.

[0066] It should be noted that the present application adopts the mode of directly drawing the inner tube 1 into the circular braiding machine 3 for braiding the outer layer band blank 4 after the inner tube 1 is completed and cooled. Compared with the traditional staged operation mode, this mode has significant advantages: it eliminates intermediate links such as winding, transportation, unwinding, etc., improves production efficiency and reduces comprehensive cost. At the same time, it avoids the surface pollution, size deformation of the inner tube 1, and the inactivation or damage of the active surface after modification treatment caused by intermediate storage and transportation, thereby guaranteeing the product, especially the high consistency and reliability of its interfacial adhesion performance at the root.

[0067] The dry tube assembly formed by the outer layer band blank 4 and the inner tube 1 is wound into a roll assembly by a winding device. In the winding process, the winding device forms a composite dry tube assembly by winding the inner tube 1 nested with the braided outer layer band blank 4 through the winding roll, and at the same time, an automatic wire arrangement system is provided to make the dry tube assembly evenly distributed on the reel, forming a standardized roll assembly with compact structure, no cross deformation and convenient transportation and storage.

[0068] When the material of the inner tube 1 is thermoplastic polyurethane (TPU), the cooling process in step S2 adopts a gradient cooling process. This process aims to optimize the micro-morphology of the outer surface of the inner tube 1 to enhance the mechanical embedding effect between the outer surface of the inner tube 1 and the subsequent braided outer tape blank 4. Specifically, the gradient cooling process is divided into two stages: first, the inner tube 1 just extruded from the extruder in a molten state is immersed in a first hot water bath with a temperature of 60-80°C for 5-10 seconds. This high-temperature short-time cooling stage can preliminarily set the inner tube 1 and effectively prevent the tube body from deforming due to rapid cooling or uneven stress. Subsequently, the preliminarily set inner tube 1 is immediately introduced into a second cold water bath with a temperature of 20-30°C for further cooling for 10-15 seconds. By coordinating the temperature difference and time of the two-stage cooling, the overall average cooling rate of the inner tube 1 is controlled at 5-8°C / s. The above-mentioned gradient cooling can induce controllable phase separation and crystallization on the surface of the TPU material, thereby actively forming a uniform distribution of micro-bump structures on the outer surface of the inner tube 1. Through microscopic observation, the height of these micro-bumps is about 0.1-0.3μm, and the pitch is about 0.5-1.0μm. This specific surface topography avoids the formation of a smooth surface and provides effective physical engagement points for the subsequent yarns 5 of the outer tape blank 4. After completing the gradient cooling, the surface temperature of the inner tube 1 is precisely controlled in the optimal window of 35-45°C. At this temperature, the TPU material not only maintains sufficient flexibility to avoid brittleness, but also has sufficient dimensional stability. Subsequently, within 30 seconds after the cooling process is completed, the inner tube 1 with a temperature in this optimal interval is quickly pulled into the inlet of the circular knitting machine 3, and the outer tape blank 4 braiding process in step S4 is immediately started. This immediate braiding strategy minimizes the opportunity for dust to be adsorbed on the surface of the inner tube 1 exposed to the air and ensures that the micro-bump structure is in the best state to contact the yarns 5. During braiding, the braiding tension of the circular knitting machine 3 is controlled at 5-8N, and the braiding density is 20-30 yarns / cm. Under this parameter, the yarns 5 can tightly embed the micro-bumps on the surface of the inner tube 1, increasing the final adhesion of the two. Through the coordinated scheme of this gradient cooling and immediate braiding, the interfacial bonding force between the inner tube 1 and the outer tape blank 4 is improved, compared with the conventional method of direct cooling and subsequent placement and braiding, the bonding force is improved, and the delamination rate during subsequent epoxy resin impregnation is reduced.

[0069] After the inner tube 1 is extruded from the extruder and cooled, in order to improve the adhesion between the outer surface of the inner tube 1 and the future injected glue solution, the outer surface of the inner tube 1 is subjected to surface treatment, therefore, between step S3 and step S4, a step of surface modification treatment of the outer surface of the inner tube 1 can also be provided, please refer to Figure 3 , the surface modification includes:

[0070] S2a mechanical roughening: the outer surface of the inner tube 1 is subjected to mechanical roughening treatment;

[0071] S2b graft modification: the outer surface subjected to roughening treatment is subjected to graft treatment, and through chemical reaction or high-energy irradiation, a compound containing polar functional groups is grafted to the polymer surface of the inner tube 1;

[0072] S2c primer treatment: a layer of primer is coated on the outer surface subjected to graft modification, and the primer contains an epoxy resin adhesion promoter.

[0073] In some preferred embodiments, the mechanical roughening treatment of the outer surface of the inner tube 1 in step S2a is achieved by a sandblasting process. This process is particularly suitable when the material of the inner tube 1 is a non-polar polymer such as polyethylene PE, which has poor adhesion properties with epoxy resin. Specifically, the inner tube 1 after cooling and shaping in step S3 is continuously pulled through an online sandblasting device. The online sandblasting device is provided with a closed treatment chamber, which can uniformly treat the outer surface of the continuously moving inner tube 1 and effectively remove burrs or residual glue that may exist. The abrasive used in the sandblasting process is brown corundum sand with a mesh size of 80 to 120. The sandblasting pressure is 0.3 to 0.5 MPa, the distance between the sandblasting gun and the outer surface of the inner tube 1 is controlled between 15 to 25 cm, and the treatment time of the inner tube 1 through the sandblasting area is 10 to 20 s. By precisely controlling the sandblasting process parameters, a uniform and moderate concave-convex structure can be formed on the outer surface of the inner tube 1. After treatment, the arithmetic average roughness Ra of the outer surface of the inner tube 1 can reach an optimized range of 1.5 to 2.5 μm, and the micro-morphology shows pits with a depth of about 0.8 to 1.2 μm and a pitch of about 2 to 3 μm. 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 the subsequent graft modification step; on the other hand, it avoids excessive polishing that may cause a decrease in the strength of the inner tube 1 or surface defects.

[0074] In a specific embodiment, the graft modification treatment of step S2b is particularly suitable for the inner tube 1 made of non-polar polymers such as polyethylene PE after mechanical roughening treatment in step S2a. This step aims to introduce polar functional groups on the surface of the tube by chemical means, thereby fundamentally improving its chemical adhesion ability with epoxy resin. The graft modification is achieved by high-energy irradiation induction. Specifically, a low-temperature plasma-induced grafting method is used, which includes two consecutive stages:

[0075] The first stage is plasma pretreatment: the inner tube 1 with specific concave-convex structure on the surface after mechanical roughening treatment is continuously passed through an online low-temperature plasma treatment device. The treatment is carried out in an inert argon atmosphere, and the output power of the plasma is controlled between 300 W and 500 W, and the treatment time of the outer surface of the inner tube 1 is 5 s to 8 s. The pretreatment can effectively activate the PE molecular chain and produce active groups such as hydroxyl and carboxyl on the surface, thereby improving the chemical activity of the surface. What is particularly important is that the concave pits generated by the previous mechanical roughening have higher surface energy, and the active species generated by the plasma will preferentially act on these concave pit areas, so that the active site density in the concave pits is significantly higher than that in the convex areas.

[0076] The second stage is grafting reaction: immediately after the plasma pretreatment, the inner tube 1 is guided through a grafting reaction zone. In this area, a 5wt% to 10wt% maleic anhydride ethanol solution is sprayed or coated onto the active outer surface of the inner tube 1 as a grafting liquid. Subsequently, a plasma-induced grafting reaction is carried out at a temperature of 60°C to 80°C for 15 min to 30 min. In this process, the anhydride groups in the maleic anhydride monomer will chemically react with the activated active sites on the PE surface to covalently graft onto the polymer molecular chain.

[0077] By precisely controlling the above-mentioned power, concentration, temperature and time parameters, the final grafting rate can be stably controlled in the ideal range of 1.2wt% to 2.0wt%. Due to the selective activation effect of plasma pretreatment, maleic anhydride monomers will preferentially enrich and graft in the pits generated by mechanical roughening, so that the grafting concentration in the pits can be 2 to 3 times higher than that in the convex points on the surface. This anchoring enrichment effect, combined with the physical anchoring points provided by mechanical roughening, realizes the synergistic reinforcement of physical embedding and chemical bonding, and lays a foundation for the firm combination with epoxy resin in the subsequent process.

[0078] In a preferred embodiment, the primer treatment of step S2c is a further step to enhance the interfacial adhesion performance on the basis of the graft modification of step S2b. This step is particularly suitable for applications where the reliability of the adhesion is of utmost importance. The primer treatment specifically comprises uniformly coating the outer surface of the inner tube 1 that has been mechanically roughened and graft-modified with a special primer. The primer is an epoxy adhesion promoter, and its specific composition is a polyolefin solution containing 5wt% to 8wt% of maleic anhydride. The primer is prepared using a solvent that is a mixture of xylene and ethanol in a volume ratio of 3:1 to achieve a suitable spraying viscosity and leveling property. The coating operation is completed by an integrated online micro-quantitative spraying system to ensure the uniformity and consistency of the coating. After coating, the thickness of the wet film needs to be precisely controlled to be between 0.5pm and 1.0pm. This film thickness range is optimized, and if the film thickness is too thin, it cannot fill the surface micro-pits and form a continuous interfacial layer; if the film thickness is too thick, it may generate internal stress due to solvent evaporation or curing shrinkage, which in turn affects the adhesion strength. After coating, the primer needs to be cured. The inner tube 1 coated with the primer is guided through a low-temperature curing zone, and the temperature is maintained at 60°C to 70°C for 10min to 15min to allow the primer to fully cure and form a firm primer layer.

[0079] The primer treatment plays a key role through a filling-reaction synergistic mechanism. Firstly, physical filling. The liquid primer can effectively infiltrate and fill the micro-pits and gaps on the outer surface of the inner tube 1 after roughening and graft modification, and expel the interfacial air, thereby avoiding the formation of interfacial bubbles during subsequent impregnation of the epoxy resin. Secondly, chemical bonding. The polyolefin segment in the primer has good compatibility with the PE substrate, and the maleic anhydride group contained therein has dual reactivity: on the one hand, it can react with the grafted maleic anhydride functional groups in the graft-modified layer through the interaction between anhydride groups or with a small amount of carboxyl groups that may exist in the graft layer to form a firm bond; on the other hand, during the subsequent pipeline repair process, these maleic anhydride groups can undergo ring-opening reaction with the epoxy groups of the impregnated epoxy resin to form strong chemical bonds (covalent bonds). Therefore, this primer layer plays a bridging role between the graft-modified layer and the epoxy resin, and by forming dual chemical bonds, it enhances the chemical adhesion of the interface and improves the reliability of the dry pipe assembly during long-term use.

[0080] It should be noted that the mechanical roughening treatment of step S2a, the graft modification of step S2b and the primer treatment of step S2c are sequentially and continuously performed. These three steps, through functional synergy and complementation, jointly constitute a complete, efficient and stable technical solution, producing a synergistic effect. First, step S2a creates a micro concave-convex structure, providing mechanical anchoring points for adhesion and increasing the specific surface area; step S2b, on this basis, uses the high activity of the rough surface, especially the concave area, to achieve the anchoring and enrichment of polar functional groups (such as maleic anhydride), improving the adhesion mechanism from physical action to chemical bonding level; step S2c fills the micro concave pits with primer to eliminate interface defects, and uses its molecules as a bridging agent, one end bonded to the graft layer and the other end reacted with epoxy resin, achieving perfect interface transition. This combination produces beneficial effects that cannot be matched by single or two-step processes. Through the triple action of mechanical interlocking, chemical bonding and interface bridging, it achieves high initial adhesion strength and excellent adhesion durability, effectively resisting environmental stress and reducing the risk of delamination.

[0081] In a specific embodiment, to solve the problem of unstable surface treatment effect of PE inner tube 1 and low product qualification rate caused by factors such as raw material batch and equipment fluctuation, the present application adopts a closed-loop automatic control system for steps S2a mechanical roughening treatment, step S2b graft modification and step S2c primer treatment, to realize real-time detection and dynamic adjustment of process parameters, and ensure the high consistency of the adhesion performance of the final product. The closed-loop control specifically includes the following three links:

[0082] 1. S2a-1 online roughness control. After the inner tube 1 is mechanically roughened, a laser roughness meter is immediately used to detect the arithmetic average roughness Ra value of its outer surface online. The detection data is transmitted to the central control system in real time. The control system compares the detected Ra measured value with the preset target range (first and second preset thresholds). As a specific optimization example, the target range is set to Ra 1.5 μm to 2.5 μm. If the detected Ra value is less than 1.5 μm, the control system automatically sends a command to the sandblasting device to increase the sandblasting pressure by 0.05 MPa; if the detected Ra value is greater than 2.5 μm, the sandblasting pressure is automatically reduced by 0.05 MPa. Through this real-time feedback adjustment, the roughness is stably controlled in the best range.

[0083] 2. S2b-1 grafting rate online regulation. After the inner tube 1 is completed with grafting modification treatment, the outer surface is immediately scanned by an online Fourier infrared spectrometer to monitor the intensity of the maleic anhydride characteristic peak, and the grafting rate is calculated accordingly. The measured value of the calculated grafting rate is fed back to the control system in real time. The control system compares the measured value with the preset target range (third and fourth preset thresholds). In a specific embodiment, the target grafting rate range is set to 1.2wt% to 2.0wt%. If the grafting rate is less than 1.2wt%, the control system automatically extends the plasma grafting reaction time by 5 minutes; if the grafting rate is higher than 2.0wt%, the grafting reaction time is automatically shortened by 5 minutes. In this way, the stability of the grafting modification effect is ensured.

[0084] 3. S2c-1 film thickness online regulation. After the inner tube 1 is completed with primer coating, the wet film thickness is immediately measured using an online film thickness meter. The film thickness measured value is transmitted to the control system in real time. The control system compares the measured value with the preset target range (fifth and sixth preset thresholds). For example, the target film thickness can be set to 0.5μm to 1.0μm. If the film thickness is detected to be less than 0.5μm, the control system will instruct the coating equipment to increase the coating operation once; if the film thickness is higher than 1.0μm, the inner tube 1 will be automatically reduced by 0.5m / min in the traction speed through the coating area, thereby reducing the coating amount.

[0085] The present application can effectively overcome the fluctuations in the production process by the above-mentioned real-time detection, dynamic feedback and automatic adjustment closed-loop control method, improve the surface treatment effect qualification rate of the PE inner tube 1, and strictly control the final bonding strength fluctuation of the inner tube 1 and the epoxy resin within a certain range, thereby improving the consistency and reliability of the product quality.

[0086] Example 3

[0087] Based on the above-mentioned embodiment 2, the present embodiment 3 further provides a dry pipe assembly manufacturing system, mainly including an inner tube forming device, a cooling device, an outer layer strip weaving device and a winding device.

[0088] The inner tube forming device is used to extrude the molten rubber to form the inner tube 1. The inner tube forming device includes an extruder which extrudes the molten rubber to form the inner tube 1. The extruder for making the inner tube 1 can use a co-extrusion process extruder which can only inject rubber into the rubber injection port on one side and not inject rubber into the rubber injection port on the other side. Of course, an extruder which only extrudes rubber on one side to form the inner tube 1 can also be used.

[0089] The cooling device is used for cooling the inner tube 1 extruded by the inner tube forming device. Specifically, the cooling device comprises a first cooling unit and a second cooling unit arranged in sequence along the running direction of the inner tube 1. The first cooling unit is a first hot water bath containing hot water with a temperature maintained at 60-80°C. The inner tube 1 is first immersed in the first hot water bath for preliminary cooling by the hot water, with a residence time controlled at 5-10s to achieve preliminary setting and prevent deformation of the tube body. The second cooling unit is arranged immediately after the first cooling unit. The second cooling unit is a second cold water bath containing cold water with a temperature maintained at 20-30°C. The preliminarily set inner tube 1 is then immersed in the second cold water bath for second-stage cooling, with a residence time controlled at 10-15s. Through the action of the first cooling unit and the second cooling unit, the cooling device can control the overall average cooling rate of the inner tube 1 to be within the range of 5-8°C / s. The system also integrates a temperature sensor and a control system for real-time monitoring of the surface temperature of the inner tube 1 after it leaves the second cooling unit, and through adjustment of the water temperature or the pulling speed, etc., ensures that the surface temperature is stabilized in the optimal interval of 35-45°C, preparing for the subsequent immediate braiding process.

[0090] The outer tape blank braiding device is used for braiding the outer tape blank 4 outside the cooled inner tube 1. The outer tape blank braiding device comprises a circular loom 3, and the cooled inner tube 1 is directly pulled into the circular loom 3 for braiding the outer tape blank 4 without being wound.

[0091] The winding device is used for manufacturing a dry tube assembly roll in the factory. The winding device winds the nested outer tape blank 4 and inner tube 1 assembly into a roll assembly. The winding is formed by a winding roller, and an automatic wire arrangement system is provided to make the dry tube assembly evenly distributed on the reel, forming a standardized roll assembly with compact structure, no cross deformation and convenient transportation and storage.

[0092] In a preferred embodiment, the manufacturing system further comprises a surface modification device arranged between the cooling device and the outer tape blank weaving device, for online and continuous modification treatment of the outer surface of the cooled and set inner tube 1 to improve the bonding performance with the subsequent impregnated epoxy resin. The surface modification device specifically comprises a mechanical roughening device, a grafting modification device and a primer treatment device connected in sequence.

[0093] The mechanical roughening device is an online sandblasting equipment with a closed processing chamber. The device is provided with an abrasive supply unit, which can uniformly spray 80-120 mesh brown corundum particles on the outer surface of the inner tube 1 for 10-20 s at a sandblasting pressure of 0.3-0.5 MPa, a distance of 15-25 cm between the sandblasting gun mouth and the outer surface of the inner tube 1, and an arithmetic average roughness Ra of 1.5-2.5 μm on the surface.

[0094] The graft modification device is arranged downstream of the mechanical roughening device and includes a plasma treatment unit and a graft reaction unit arranged in sequence. The plasma treatment unit can generate a low-temperature plasma with a power of 300-500 W in an argon environment and pre-treat the outer surface of the moving inner tube 1 for 5-8 s. The graft reaction unit is provided with a graft liquid spraying mechanism and a temperature-controlled reaction channel, which can uniformly apply a 5wt%-10wt% maleic anhydride ethanol solution to the pre-treated pipe surface and maintain it at 60-80°C for 15-30 min to complete the graft reaction, with a grafting rate of 1.2wt%-2.0wt%.

[0095] The primer treatment device is arranged downstream of the graft modification device and includes a precision coating unit and a curing unit. The precision coating unit can be a micro-quantitative spraying system for uniformly coating a 5wt%-8wt% maleic anhydride-containing polyolefin primer (solvent: xylene: ethanol = 3:1) on the surface of the inner tube 1 with a wet film thickness of 0.5-1.0 μm. The curing unit that follows is a low-temperature oven, which can cure the coating for 10-15 min at 60-70°C to form a stable primer layer.

[0096] In a preferred embodiment, please refer to Figure 5 The surface modification device is also provided with an online surface quality closed-loop control system. The online surface quality closed-loop control system realizes real-time monitoring and dynamic adjustment of the surface modification process parameters by setting online detection sensors at key process points and linking them with the central controller and the actuator. The closed-loop control system includes the following units:

[0097] 1. Roughness online regulation unit: arranged after the mechanical roughening device, including a laser roughness meter, which is aligned with the outer surface of the inner tube 1 after sandblasting treatment, and detects the arithmetic average roughness Ra value in real time. The detection data is transmitted to the central controller in real time. The target range of Ra preset in the central controller is 1.5 μm to 2.5 μm. If the measured Ra value is lower than 1.5 μm, the controller will send 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 command will decrease the sandblasting pressure by 0.05 MPa, so as to realize stable control of roughness.

[0098] 2. Grafting rate online regulation unit: arranged after the grafting modification device, including an online Fourier infrared spectrometer, which scans the outer surface of the treated inner tube 1 and monitors the intensity of the maleic anhydride characteristic peak in real time to calculate the grafting rate. The measured grafting rate is fed back to the central controller in real time. The target range of grafting rate preset in the controller is 1.2 wt% to 2.0 wt%. If the grafting rate is lower than 1.2 wt%, the controller will automatically extend the process time of the plasma grafting reaction unit by 5 minutes; if it is higher than 2.0 wt%, the process time will be automatically shortened by 5 minutes.

[0099] 3. Film thickness online regulation unit: arranged after the coating unit of the primer treatment device, including an online film thickness meter, which measures the thickness of the primer wet film in real time. The measured film thickness is transmitted to the central controller. The target range of film thickness preset in the controller is 0.5 μm to 1.0 μm. If the film thickness is lower than 0.5 μm, the controller will instruct the precision coating unit of the primer device to increase the coating operation; if the film thickness is higher than 1.0 μm, the pulling speed of the inner tube 1 through the coating area will be automatically reduced by 0.5 m / min to reduce the coating amount.

[0100] The surface modification device realizes closed-loop logic operation by integrating online detection and execution units and through the central controller, and constitutes an intelligent production process. It can actively respond to fluctuations in raw materials and equipment, ensure that the effect of each step of surface treatment is stable within the optimal parameter window, and thus ensure the high consistency and reliability of the bonding performance of the final dry pipe assembly product.

[0101] Example 4

[0102] Please refer to Figure 6 The pipe repair construction method disclosed by the present application comprises the following steps:

[0103] a) Dry pipe assembly manufacturing: using the dry pipe assembly manufacturing method of the above-mentioned examples to manufacture a reel of dry pipe assembly;

[0104] b) Dry pipe on-site unwinding: unwinding the reel of dry pipe assembly on the construction site;

[0105] c) Glue injection: Insert the injection needle of the glue injection device between the inner rubber tube 1 and the outer belt blank 4 of the unwound dry pipe assembly to inject glue;

[0106] d) Glue pressing: Roll the dry pipe assembly with glue injected using a glue pressing roller to make the glue evenly distributed between the inner rubber tube 1 and the outer belt blank 4 of the dry pipe assembly;

[0107] e) Dragging in: Drag the dry pipe assembly treated by glue pressing from the inlet end of the pipeline to be repaired towards the outlet end;

[0108] f) Pressurized fitting: After the dry pipe assembly is pulled into the pipeline to be repaired, inject a pressure fluid into the dry pipe to make the pipeline expanded to fit the inner wall of the pipeline to be repaired;

[0109] g) Curing: Curing treatment is performed on the dry pipe assembly that has been expanded to fit the inner wall of the pipeline to be repaired, so that the glue between the inner rubber tube 1 and the outer belt blank 4 penetrates into the inner wall of the pipeline to be repaired and solidifies and bonds, thereby bonding the inner rubber tube 1, the outer belt blank 4 of the dry pipe assembly and the inner wall of the pipeline to be repaired into one body.

[0110] In step f), the pressure fluid injected into the inner cavity of the dry pipe assembly is compressed air or water. During the pipe expanding process, the pressure is maintained at 0.1-0.2 MPa for half an hour to make the dry pipe assembly expand and completely fit the original pipe wall.

[0111] In step g), curing treatment is performed in the ways of thermal curing, light curing, microwave curing or normal temperature curing. Thermal curing, light curing and microwave curing need to use curing equipment, which are thermal fluid curing device, light curing device or microwave curing device respectively, and normal temperature curing does not need curing equipment. Thermal curing includes injecting hot water, hot steam and the like into the inner cavity of the expanded dry pipe assembly for heating curing, light curing can be ultraviolet light curing, using a curing device with ultraviolet light lamp to walk in the inner cavity of the expanded dry pipe assembly and irradiate the inner wall of the pipeline, the ultraviolet light penetrates the inner rubber tube 1 (the inner rubber tube 1 is thin, and the ultraviolet light can penetrate) to cure the resin, or a microwave curing device can be used to cure the injected resin, and normal temperature curing is to naturally cure after the dry pipe is expanded. Curing treatment makes the glue between the inner rubber tube 1 and the outer belt blank 4 penetrate into the inner wall of the pipeline to be repaired and solidify and bond, thereby bonding the inner rubber tube 1, the outer belt blank 4 of the dry pipe assembly and the inner wall of the pipeline to be repaired into one body. In the light curing way, the power is 400 W-24 KW, and the irradiation time is 0.05-1.5 hours. In thermal curing, the pressure is 0.1-0.2 MPa, the temperature is 80°C, and the curing time is 2-4 hours. After curing is completed, the pressure is maintained and the dry pipe is left to stand for 8-12 hours to ensure complete curing.

[0112] Various curing methods (thermal curing, light curing, microwave curing and room temperature curing) provide sufficient process selectivity to adapt to different construction environments and pipe material requirements. Among them, thermal curing adopts 80℃ temperature and 2-4 hours curing time, light curing adopts 400W-24KW power and 0.05-1.5 hours irradiation time, which ensures the full curing of the resin. After curing, the double pressure maintaining measures of standing for 8-12 hours ensure the formation of firm and durable bonding between the repair layer and the pipeline to be repaired.

[0113] Example 5

[0114] The present application also relates to a pipeline repair construction system for realizing the construction method of the above-mentioned embodiments, comprising:

[0115] The manufacturing system of the dry pipe assembly adopts the manufacturing system of the dry pipe assembly described in the above-mentioned embodiments, mainly including an inner rubber tube forming device, a cooling device, an outer layer strip weaving device and a winding device;

[0116] The unwinding device is used to unwind the winding drum of the dry pipe assembly at the construction site;

[0117] The glue injection device is used to inject glue between the inner rubber tube 1 and the outer layer strip 4 of the unwound dry pipe assembly;

[0118] The glue pressing device includes a glue pressing roller assembly for pressing the glued dry pipe assembly to evenly distribute the glue;

[0119] The traction device is used to pull the dry pipe assembly that has completed the glue pressing from the inlet end to the outlet end of the pipeline to be repaired, so that the dry pipe assembly is inserted into the pipeline to be repaired;

[0120] The pipe supporting device is used to inject pressure fluid into the inner cavity of the dry pipe assembly to make the dry pipe assembly be supported and fit the inner wall of the pipeline to be repaired.

[0121] The manufacturing system of the dry pipe assembly is arranged in the factory, and the related work is completed in the factory to manufacture the winding drum of the dry pipe assembly, which prepares for the subsequent construction site work.

[0122] At the pipeline repair construction site, after the pipeline to be repaired is cleaned by high-pressure water jet, the winding drum of the dry pipe assembly prepared in the factory is unwound by the hydraulic drive or electric control unwinding device. The guiding and correcting device ensures the smooth expansion of the dry pipe assembly, avoids twisting, wrinkling or surface damage, and provides continuous and stable material supply for the subsequent glue injection and pulling-in process.

[0123] The glue injection device is used for injecting glue between the inner layer rubber tube 1 and the outer layer tape blank 4 of the dry pipe assembly after being unwound, and the glue injection device comprises injection needles. After the winding drum of the dry pipe assembly is unwound at the construction site, the glue injection operation is performed through the glue injection device provided with a plurality of injection needles. The number of injection needles is determined according to the caliber of the dry pipe assembly and is uniformly distributed on the upper and lower surfaces of the dry pipe assembly. During glue injection, the injection needles are inserted between the outer layer tape blank 4 and the inner layer rubber tube 1 through the weaving gap of the outer layer tape blank 4 to inject glue. Generally, resin is used as glue liquid for glue injection, and the flowability of the resin selected for glue injection is matched with the tightness of the outer layer tape blank 4 to ensure that the resin does not leak out of the outer layer tape blank 4 during glue injection. Specifically, the resin used for glue injection can be CC2013 resin.

[0124] The injection needle design uniformly distributed on the upper and lower surfaces ensures that the resin is uniformly distributed in the cavity between the outer layer tape blank 4 and the inner layer rubber tube 1, avoiding the incomplete filling problem that may be caused by one-sided glue injection. The intelligent configuration of the number of needles according to the caliber not only ensures the glue injection efficiency but also avoids resource waste, realizing precise glue injection. The matching of the resin flowability and the tightness of the outer layer tape blank 4 prevents the resin from leaking from the outer layer tape blank 4, ensuring clean and efficient glue injection process. The glue injection method not only improves the construction quality and makes the resin filling uniform and complete, but also significantly reduces the resin consumption, compared with the traditional turnover method, thereby reducing the material cost.

[0125] The glue pressing device is used for pressing the glued dry pipe assembly to make the glue liquid uniformly distributed, and the glue pressing device comprises a plurality of pairs of glue pressing rollers arranged in pairs, each pair of glue pressing rollers being a group. The glued dry pipe assembly passes between each pair of glue pressing rollers to be flattened so that the glue liquid is uniformly distributed between the outer layer tape blank 4 and the inner layer rubber tube 1 of the dry pipe assembly. After the glue injection is started, the glue pressing device using the glue pressing rollers is used to roll press the dry pipe assembly injected with resin, so that the injected resin is uniformly distributed in the cavity between the outer layer tape blank 4 and the inner layer rubber tube 1. Since the outer layer tape blank 4 has a high tightness characteristic, an effective sealing barrier is formed during the glue pressing process, and the resin is relatively viscous at room temperature, which ensures that there is no resin leakage after the dry pipe assembly is pressed. The glue pressing method using the glue pressing rollers not only ensures the uniform distribution of the resin in the cavity between the outer layer tape blank 4 and the inner layer rubber tube 1, but also avoids damage to the dry pipe assembly caused by excessive pressure. The glue pressing method makes the resin continuously and uniformly distributed in the cavity, providing ideal basic conditions for the subsequent curing process, and significantly improves the integrity and durability of the repair layer.

[0126] The traction device is used to pull the dry pipe assembly after the glue pressing into the inlet end of the pipe to be repaired towards the outlet end, so that the dry pipe assembly is inserted into the pipe to be repaired. The inlet end and the outlet end are respectively arranged at the head and tail of the pipe to be repaired. The traction device is arranged at the outlet end, and the traction end of the traction device is connected with the end of the dry pipe assembly, which is used to pull the dry pipe assembly after the glue pressing from the inlet end and through the pipe to be repaired, and finally reaches the outlet end. Before pulling, the end of the dry pipe assembly is tightly tied or blocked to prevent the glue from leaking out of the inner rubber tube 1 and the outer layer 4. The dry pipe assembly can also be U-shaped, and the cross section of the dry pipe assembly is folded into a U-shaped shape for pulling.

[0127] The pipe supporting device is used to inject pressure fluid into the dry pipe assembly so that the pipe is expanded to fit the inner wall of the pipe to be repaired. The end of the dry pipe assembly at the outlet end of the pipe to be repaired is provided with an outlet end plug, and the end of the dry pipe assembly at the inlet end of the pipe to be repaired is provided with an inlet end plug. The pressure fluid can be compressed air or water. If water is injected, the water is drained through the outlet after the subsequent curing process. Specifically, the U-shaped dry pipe assembly is expanded and completely fitted to the original pipe wall under the condition of 0.1-0.2MPa pressure for half an hour during the pipe supporting process. The pipe supporting device of the present application uses pressure fluid to perform the pipe supporting operation, which ensures that the dry pipe assembly is completely expanded and fitted to the inner wall of the pipe to be repaired.

[0128] It should be noted that the pipe supporting device is also provided with an intelligent pressure maintaining system, including an intelligent pressure maintaining device, a control module and an adjusting valve, etc., which realizes accurate pressure control. The multifunctional integrated design of the intelligent pressure maintaining system of the present application meets the needs of different working conditions, greatly improves the applicability of the equipment, and the accurate pressure control ensures that the repair layer is uniformly fitted, significantly improves the curing quality consistency and peel strength. The air between the repair lining and the pipe to be repaired is effectively removed, which ensures complete fitting and significantly improves the integrity and durability of the repair layer.

[0129] In order to cure the injected glue liquid in the dry pipe assembly, heat curing, light curing, microwave curing or normal temperature curing can be used to cure the dry pipe assembly which has been expanded and adhered to the inner wall of the pipeline to be repaired. Among them, heat curing, light curing and microwave curing need to use curing equipment, and the curing equipment is a heat fluid curing device, a light curing device or a microwave curing device, and normal temperature curing does not need curing equipment. Heat curing includes injecting hot water, hot steam and the like into the inner cavity of the expanded dry pipe assembly for heating and curing, light curing can be ultraviolet light curing, and a curing device with an ultraviolet light lamp is used to walk in the pipeline inner cavity of the expanded dry pipe assembly and irradiate the pipeline inner wall, the ultraviolet light penetrates the inner tube 1 (the inner tube 1 is thin, and the ultraviolet light can penetrate) to cure the resin, or a microwave curing device can be used to cure the injected resin, and normal temperature curing is to naturally cure after the dry pipe is expanded. The curing treatment makes the glue liquid between the inner tube 1 and the outer layer strip 4 penetrate into the inner wall of the pipeline to be repaired and be cured and bonded, so that the inner tube 1, the outer layer strip 4 of the dry pipe assembly and the inner wall of the pipeline to be repaired are integrated. In the light curing mode, the power is 400W-24KW, and the irradiation time is 0.05-1.5 hours. When heat curing, a pressure of 0.1-0.2MPa and a temperature of 80℃ are adopted, and the curing time is 2-4 hours. After curing, pressure holding and standing for 8-12 hours are adopted to ensure complete curing.

[0130] The various curing methods (heat curing, light curing, microwave curing and normal temperature curing) provide sufficient process selectivity, adapt to different construction environments and pipeline material requirements, among which heat curing adopts a temperature of 80℃ and a curing time of 2-4 hours, and light curing adopts a power of 400W-24KW and an irradiation time of 0.05-1.5 hours, so as to ensure sufficient curing of the resin. The double pressure holding measures of pressure holding and standing for 8-12 hours after curing ensure that the repair layer and the pipeline to be repaired form firm and durable bonding.

[0131] The above describes the preferred embodiments of the present application. It should be understood that the present application is not limited to the above specific embodiments, nor is it limited to the dry pipe assembly and the manufacturing method, construction method and system thereof. The equipment and structures not fully described should be understood as being implemented in a common way in the art; any person skilled in the art can make many possible changes and modifications to the technical solutions of the present application or modify equivalent embodiments with equivalent changes without departing from the scope of the technical solutions of the present application, which does not affect the essential content of the present application. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, which does not depart from the content of the technical solutions of the present application, still belongs to the scope of protection of the technical solutions of the present application.

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 to facilitate subsequent glue injection between the outer layer preform and the inner layer tubing, forming a cavity between the outer layer preform and the inner layer tubing to accommodate the resin. The fabrication of the main pipe assembly is completed in the factory. The pipeline repair and construction process includes the following steps: On-site unwinding of main pipe: Unwinding the main pipe assembly roll at the construction site; 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; Pressing: Pressing the glued dry tube assembly with a pressing roller to make the glue evenly distributed between the inner tube and the outer strip blank of the dry tube assembly. Pull-in: Pull the dry pipe assembly, which has been treated with adhesive bonding, from the inlet end of the pipe to be repaired towards the outlet end; Pressure bonding: After the main pipe assembly is pulled 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. 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.

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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