Underground pipe network ultraviolet curing hose folding repairing method and system

Abstract

The invention discloses an underground pipe network ultraviolet curing hose folding repairing method and system, and relates to the repairing technology of plastic pipes, the method comprises the following steps: placing a measuring probe in a to-be-repaired pipeline, collecting circumferential data and axial data of the inner wall of the pipeline, and determining space coordinates of a damage position according to the circumferential data and the axial data; based on the space coordinates of the damage position, the hose is evenly coated with photosensitive resin in the axial direction, and the hose is folded into a U shape through a pressure pump; coating the outer surface of the hose with ultraviolet curing resin, and extracting air in the hose by using a vacuum pump to form a negative pressure state; the hose is conveyed to the to-be-repaired position of the pipe network, compressed air is injected into the hose through an inflation device, and the hose is attached to the inner wall of the pipe network; and the ultraviolet light curing lamp is started to move in the axial direction of the hose, curing treatment is conducted on the ultraviolet light curing resin, and pipe network repairing is completed. Through a series of technical means such as damage position identification, hose folding and resin coating, the underground pipeline repairing precision and efficiency are remarkably improved.

Description

Technical Field

[0001] The invention relates to a plastic pipe repair technology, in particular to a method and system for folding and repairing an ultraviolet light-curing hose of an underground pipe network. Background Art

[0002] With the acceleration of urbanization, the construction and maintenance of underground pipelines have become particularly important. Traditional underground pipeline repair methods mostly rely on excavation and replacement of damaged pipes. This method is not only time-consuming and labor-intensive, but also has a certain impact on the surrounding environment. Therefore, in recent years, trenchless technologies based on lining repair (such as UV curing technology, airbag lining repair technology, etc.) have gradually been used. UV curing technology has attracted widespread attention due to its simple operation, good repair effect and relatively low cost. This technology mainly coats photosensitive resin on the inner wall of the pipe and uses an ultraviolet light source to cure the resin, thereby forming a new solid layer inside the pipe, effectively repairing cracks or damage in the pipe and extending the service life of the pipe. However, the existing UV curing repair method still faces some technical challenges, especially in terms of hose folding, air pressure control, resin curing uniformity, etc., and there is still room for improvement.

[0003] At present, the common practice of UV curing repair method is to use a prefabricated curing hose, insert it into the pipeline, and inflate it to make it fit the inner wall of the pipeline for repair. However, these methods have the following problems: First, the uniformity of the hose coating resin in the existing repair method is poor, and it is difficult to ensure the uniform distribution of the resin on the inner wall of the pipeline, which may lead to insufficient local curing and unsatisfactory repair effect; second, during the folding process of the hose, the resin may be incompletely cured or deformed due to uneven pressure, affecting the quality of the repair; in addition, the precise positioning of the damage position and the refined processing of the repair area in the existing technology are relatively rough, often relying on manual experience, and cannot achieve high-precision and high-efficiency repair. In response to these problems, the present invention proposes a new repair method, which can effectively solve the deficiencies in the existing technology and improve the stability and accuracy of the repair effect through technical means such as precise positioning of the damage position, uniform resin coating, and hose inflation under negative pressure. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention proposes a method and system for folding and repairing an ultraviolet light-curing hose of an underground pipe network.

[0005] Therefore, the present invention provides a method for folding and repairing an underground pipe network UV-curing hose, which can solve the problems mentioned in the background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] In a first aspect, an embodiment of the present invention provides a method for folding and repairing an ultraviolet light-curing hose of an underground pipe network, which comprises:

[0008] A measuring probe is placed in the pipeline to be repaired to collect circumferential data and axial data of the inner wall of the pipeline, and the spatial coordinates of the damage position are determined according to the circumferential data and axial data;

[0009] Based on the spatial coordinates of the damage position, folding the hose into a U shape by a pressure pump;

[0010] Applying ultraviolet curing resin to the outer surface of the hose, and using a vacuum pump to extract the air inside the hose to form a negative pressure state;

[0011] The hose is transported to the location of the pipe network to be repaired, and compressed air is injected into the hose through an inflation device to make the hose fit the inner wall of the pipe network;

[0012] The ultraviolet curing lamp is started to move along the axial direction of the hose to cure the ultraviolet curing resin, thereby completing the pipe network repair.

[0013] As a preferred solution of the underground pipe network UV-curing hose folding repair method of the present invention, the spatial coordinates of the damage position are determined based on the comprehensive damage assessment index, including:

[0014] Taking the center of the pipeline inlet end face as the coordinate origin, establish the Z axis along the axial direction of the pipeline, establish the Y axis vertically upward, and establish the X axis perpendicular to the YZ plane to form a right-handed rectangular coordinate system; on each measuring section, sort the measurement data of eight groups of laser rangefinders according to the angular position and compare them with the standard circular section; when the comprehensive damage assessment index values ​​of three or more adjacent measuring points exceed 1.5 times the average value of the section, the closed area formed by the connecting lines of these measuring points is defined as a suspected damage area; when suspected damage areas appear in three or more axially adjacent measuring sections, and the circumferential position overlap of the suspected areas exceeds 60%, these areas are regarded as preliminary damage areas;

[0015] For each preliminary damage area, calculate its circumferential boundary and axial boundary respectively. When the change rate of the comprehensive damage assessment index value of adjacent measuring points exceeds 30%, the position is marked as the circumferential boundary point; the determination of the axial boundary is based on the distribution curve of the comprehensive damage assessment index value of the continuous measurement section. When the absolute value of the slope of the curve is less than 0.1, the section position is marked as the axial boundary; determine the damage area;

[0016] In the determined damage area, the difference between the actual radius value and the nominal radius value of each measuring point is defined as the damage depth; the position coordinates of the maximum damage depth point are determined by statistical analysis of the depth values ​​of all measuring points in the damage area; at the same time, the center of gravity position of the damage area is calculated and used as the representative coordinates of the damage center point, i.e., the damage position spatial coordinates.

[0017] As a preferred solution of the underground pipe network UV-curing hose folding repair method of the present invention, the calculation of the comprehensive damage assessment index is shown in the following formula:

[0018] CDR=α1·CSI+α2·ASI+α3·SCF+α4·f(t)

[0019] Among them, α1, α2, α3, α4 are weight coefficients, and f(t) is the time-dependent material degradation function:

[0020]

[0021] Where t is the service time of the pipeline, η is the degradation rate coefficient, SCF crit is the critical stress concentration factor, CSI is the pipe section characteristic index, ASI is the axial strain index, SCF is the stress concentration factor, and CDR is the comprehensive damage assessment index.

[0022] As a preferred solution of the underground pipe network UV-curing hose folding repair method of the present invention, the pipe cross-section characteristic index CSI is calculated as shown in the following formula:

[0023]

[0024] Among them, r i is the actual radius value of the i-th measuring point, r nom is the nominal radius of the pipeline, n is the number of measuring points, k is the pressure correction coefficient, Δp i is the pressure difference at the measuring point;

[0025] The calculation of the axial strain index ASI is shown below:

[0026]

[0027] Among them, ∈ j is the actual strain value at the jth point, ∈ allow is the allowable strain value, m is the number of axial measuring points, and θ is the weight coefficient.

[0028] As a preferred solution of the underground pipe network UV-curing hose folding and repairing method of the present invention, folding the hose into a U shape comprises:

[0029] A folding reference point is established according to the spatial coordinates of the damage position. When the damage area spans multiple sections, the coordinates of the damage center point are selected as the main positioning point, and the center position of the U-shaped fold is determined based on this, and 1.5 times the damage length is extended outward at both ends of the damage area as a transition section;

[0030] When there is a single point damage and the CDR value is within the range of 0.3-0.6, a standard symmetrical U-shaped folding is adopted, the folding angle is maintained between 120°-150°, the radius of curvature is 4-5 times the diameter of the tube, and the two arms of the U-shape are of equal length; when the CDR value exceeds 0.6 or the damaged area is distributed in blocks, the folding angle is enlarged to 150°-170° at the damaged position, the radius of curvature is increased to 5-6 times the diameter of the tube, the two arms of the U-shape are appropriately unequal in length, but the length difference does not exceed 10% of the total length; when there are multiple points of damage or the damage is distributed in a band, a curvature gradient section is set along the damage distribution direction, the angle at the main damage is 160°-170°, and the angle at the secondary damage is reduced to 130°-150°.

[0031] As a preferred solution of the underground pipe network UV-curing hose folding repair method of the present invention, wherein: coating the UV-curing resin on the outer surface of the hose comprises:

[0032] The ultraviolet curing resin containing acrylate is evenly coated on the outer surface of the hose by an automatic spraying device, the viscosity of the ultraviolet curing resin is controlled between 800-1200 mPa·s, the coating thickness is 2-3 mm, the spraying speed of the automatic spraying device is 0.8-1.2 m / min, and the spraying pressure is maintained at 0.3-0.5 MPa;

[0033] The hose shrinks under negative pressure to form a folded state that is 30%-40% smaller than the inner diameter of the underground pipe network; the hose under negative pressure is connected to the conveying pipeline through a sealing connector, and the sealing connector adopts a double-layer sealing ring structure, the inner sealing ring is made of nitrile rubber, and the outer sealing ring is made of fluororubber.

[0034] As a preferred solution of the underground pipe network UV-curing hose folding repair method of the present invention, wherein: the hose is transported to the position of the pipe network to be repaired by an electric winch;

[0035] The electric winch is connected to the hose in a negative pressure state through a traction rope, and a guide wheel assembly is installed at the front end of the hose. The guide wheel assembly includes three groups of elastic guide wheels distributed at an angle of 120 degrees to each other. The outer diameter of each group of guide wheels is 5-8mm smaller than the inner diameter of the underground pipeline.

[0036] As a preferred solution of the underground pipeline UV-curing hose folding repair method described in the present invention, the curing process includes a pre-curing stage and a deep curing stage; the light source power is maintained at 50-60% and the moving speed is 0.4-0.5m / min in the pre-curing stage; the light source power is increased to 80-100% and the moving speed is reduced to 0.2-0.3m / min in the deep curing stage.

[0037] In a second aspect, an embodiment of the present invention provides a folding and repairing system for an underground pipe network UV-curing hose, which comprises:

[0038] A data acquisition module is used to place a measuring probe in the pipeline to be repaired, collect circumferential data and axial data of the inner wall of the pipeline, and determine the spatial coordinates of the damage position according to the circumferential data and axial data;

[0039] A hose folding module, used for folding the hose into a U shape through a pressure pump based on the spatial coordinates of the damage position;

[0040] The repair module is used to apply ultraviolet light-curing resin to the outer surface of the hose, use a vacuum pump to extract the air inside the hose to form a negative pressure state; transport the hose to the location to be repaired in the pipeline network, inject compressed air into the hose through an inflation device, so that the hose fits the inner wall of the pipeline network; start the ultraviolet light-curing lamp to move along the axial direction of the hose, cure the ultraviolet light-curing resin, and complete the pipeline network repair.

[0041] The beneficial effect of the present invention is that the scheme significantly improves the accuracy and efficiency of underground pipeline repair through a series of technical means such as damage location identification, hose folding and resin coating. First, the circumferential and axial data of the inner wall of the pipeline are collected by precise measuring probes, and the location and degree of pipeline damage are accurately evaluated in combination with indicators such as pressure correction coefficient, axial strain, and stress concentration factor, providing a scientific basis for the formulation of repair plans. Then, the hose folding scheme is optimized based on the coordinates of the damage location, and the resin is uniformly coated through a negative pressure state, which improves the coverage and quality of the repair area. During the repair process, ultraviolet light curing technology is used to ensure uniform curing of the resin, and the consistency and stability of the repair effect are guaranteed by real-time monitoring of the curing temperature and progress. In the end, this scheme not only improves the accuracy and stability of pipeline repair, but also reduces human errors and repair costs, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0043] Figure 1 The present invention is a flow chart of a method for repairing the folding of UV-curing hoses in underground pipe networks. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0045] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0046] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0047] The present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0048] At the same time, in the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper, lower, inner and outer" are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first, second or third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0049] In the present invention, unless otherwise clearly specified and limited, the terms "install, connect, connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a mechanical connection, an electrical connection or a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] Example 1

[0051] Reference Figure 1 , which is the first embodiment of the present invention, provides a method for folding and repairing an underground pipe network UV-curing hose, comprising:

[0052] S1: placing a measuring probe into the pipeline to be repaired, collecting circumferential data and axial data of the inner wall of the pipeline, and determining the spatial coordinates of the damage position according to the circumferential data and axial data;

[0053] The measuring probe is placed in the pipeline to be repaired. The measuring probe includes eight X-axis laser rangefinders, eight Y-axis laser rangefinders and eight Z-axis laser rangefinders uniformly distributed along the circumference of the pipeline. Each group of laser rangefinders is arranged every 10 cm along the axial direction of the pipeline. The measuring probe is connected to an external driving device through a telescopic rod; the X-axis laser rangefinder, the Y-axis laser rangefinder and the Z-axis laser rangefinder respectively collect circumferential data and axial data of the inner wall of the pipeline to be repaired, the circumferential data include the roundness deviation value and the surface roughness value of the inner wall of the pipeline, and the axial data include the depth change value and the profile curve value of the inner wall of the pipeline.

[0054] In order to accurately assess the damage status of the pipeline, it is first necessary to analyze the pipeline cross-section characteristics of the collected data. Considering that the pipeline is affected by internal and external pressures during service, the pressure correction coefficient is introduced to establish the pipeline cross-section characteristic index. The basic characteristics of the collected data are first extracted to calculate the pipeline cross-section characteristic index CSI (Cross Section Index):

[0055]

[0056] Among them, r i is the actual radius value of the i-th measuring point, r nom is the nominal radius of the pipeline, n is the number of measuring points, k is the pressure correction coefficient (value range is 0.2-0.4), Δp i is the pressure difference at the measuring point.

[0057] The axial deformation of the pipeline is also an important basis for assessing damage. In order to associate the cross-sectional deformation with the axial strain, the axial strain index ASI (Axial Strain Index) is established. This index not only takes into account the deviation between the actual strain and the allowable strain, but also introduces the influence of cross-sectional characteristics:

[0058]

[0059] Among them, ∈ j is the actual strain value at the jth point, ∈ allow is the allowable strain value, m is the number of axial measuring points, and θ is the weight coefficient (ranging from 0.5 to 0.7).

[0060] In actual engineering, pipeline damage is often closely related to stress concentration. In order to accurately describe the stress distribution state, the coupling effect of cross-sectional characteristics and axial strain is taken into consideration, and the stress concentration factor SCF (Stress Concentration Factor) is proposed:

[0061]

[0062] Among them, σ max is the maximum stress value, σ nom is the nominal stress value, and δ is the comprehensive stress coefficient (ranging from 0.3 to 0.5).

[0063] The collected circumferential data and axial data are transmitted to a control system, and the control system calculates the pipeline comprehensive damage rating (CDR):

[0064] CDR=α1·CSI+α2·ASI+α3·SCF+α4·f(t)

[0065] Among them, α1, α2, α3, α4 are weight coefficients, and f(t) is the time-dependent material degradation function:

[0066]

[0067] Where t is the service time of the pipeline, η is the degradation rate coefficient (value range is 0.08-0.12), SCF crit is the critical stress concentration factor.

[0068] The control system classifies the damage degree of the pipeline based on the CDR value: when CDR<0.3, it is slight damage; when 0.3≤CDR<0.6, it is moderate damage; when 0.6≤CDR<0.8, it is severe damage; when CDR≥0.8, it is dangerous damage; corresponding to different damage levels, a three-dimensional pipeline state model including damage location, damage degree and stress distribution is generated to guide the formulation of subsequent repair plans.

[0069] It should be noted that the determination of the spatial coordinates of the damage position includes:

[0070] The overall coordinate system of the pipeline is established, with the center of the pipeline inlet end face as the coordinate origin, the Z axis is established along the axial direction of the pipeline, the Y axis is established vertically upward, and the X axis is established perpendicular to the YZ plane to form a right-handed rectangular coordinate system; on this basis, the displacement sensor of the measuring probe is calibrated with the coordinate system to establish the corresponding relationship between the probe position and the overall coordinate system.

[0071] On each measuring section, the measurement data of eight groups of laser rangefinders are sorted according to the angular position and compared with the standard circular section; when the CDR values ​​of three or more adjacent measuring points exceed 1.5 times the average value of the section, the closed area formed by the connecting lines of these measuring points is defined as a suspected damage area; when suspected damage areas appear in three or more axially adjacent measuring sections, and the circumferential position overlap of the suspected areas exceeds 60%, these areas are regarded as preliminary damage areas.

[0072] For each preliminary damage area, its circumferential boundary and axial boundary are calculated respectively. The circumferential boundary is determined by analyzing the gradient change of the CDR value. When the CDR value change rate of adjacent measuring points exceeds 30%, the position is marked as the circumferential boundary point; the axial boundary is determined based on the CDR distribution curve of the continuous measurement section. When the absolute value of the slope of the curve is less than 0.1, the section position is marked as the axial boundary.

[0073] In the determined damage area, the difference between the actual radius value and the nominal radius value of each measuring point is defined as the damage depth; the position coordinates of the maximum damage depth point are determined through statistical analysis of the depth values ​​of all measuring points in the damage area; at the same time, the center of gravity of the damage area is calculated and used as the representative coordinates of the damage center point.

[0074] S2: Based on the spatial coordinates of the damage position, the hose is uniformly coated with photosensitive resin along the axial direction, and the hose is folded into a U shape at a pressure of 0.2-0.3 MPa by a pressure pump;

[0075] First, the folding reference point is established according to the spatial coordinates of the damage location. When the damage area spans multiple sections, the coordinates of the damage center point are selected as the main positioning point, and the center position of the U-shaped fold is determined accordingly. The transition section is extended outward by 1.5 times the damage length at both ends of the damage area. This arrangement ensures that the repair area fully covers the damage range and provides a buffer space for stress transition.

[0076] Secondly, the folding parameters are optimized and designed. According to the characteristics of the damage depth distribution, when there is a single point of damage and the CDR value is in the range of 0.3-0.6, a standard symmetrical U-shaped folding is adopted, and the folding angle is maintained between 120°-150°, the radius of curvature is 4-5 times the diameter of the tube, and the two arms of the U-shaped are equal in length; when the CDR value exceeds 0.6 or the damage area is distributed in blocks, the folding angle is enlarged to 150°-170° at the damage location, the radius of curvature is increased to 5-6 times the diameter of the tube, and the two arms of the U-shaped are appropriately unequal in length, but the length difference does not exceed 10% of the total length; when there are multiple points of damage or the damage is distributed in a band, a curvature gradient section is set along the damage distribution direction, the angle at the main damage is 160°-170°, and the angle at the secondary damage is reduced to 130°-150°.

[0077] S3: coating the outer surface of the hose with ultraviolet curing resin, and using a vacuum pump to extract the air inside the hose to form a negative pressure state;

[0078] The ultraviolet curing resin containing acrylate is uniformly coated on the outer surface of the hose through an automatic spraying device, the viscosity of the ultraviolet curing resin is controlled between 800-1200mPa·s, the coating thickness is 2-3mm, the spraying speed of the automatic spraying device is 0.8-1.2m / min, and the spraying pressure is maintained at 0.3-0.5MPa; after the coating is completed, the vacuum pump located at the front end of the hose is connected, the exhaust pressure of the vacuum pump is -0.05MPa to -0.08MPa, and the air inside the hose is extracted for 8-12 minutes, and a sealing end cover is set at the rear end of the hose, and the sealing end cover is made of fluororubber material The sealing ring diameter of the sealing end cap is 2-3mm larger than the diameter of the hose; under the action of the vacuum pump, a stable negative pressure state is formed inside the hose, wherein the hose shrinks under the negative pressure to form a folded state that is 30%-40% smaller than the inner diameter of the underground pipe network; the hose under the negative pressure state is connected to the conveying pipeline through a sealing connector, and the sealing connector adopts a double-layer sealing ring structure, the inner sealing ring is made of nitrile rubber, and the outer sealing ring is made of fluororubber, to ensure that the negative pressure state is continuously stable during the conveying process; during the entire coating and vacuuming process, the ambient temperature is maintained at 20-25°C, and the relative humidity is controlled between 45% and 60%.

[0079] S4: transporting the hose to the location of the pipe network to be repaired, and injecting compressed air into the hose through an inflation device to make the hose fit the inner wall of the pipe network;

[0080] The hose in the negative pressure state is connected to the electric winch through a traction rope, the traction speed of the electric winch is controlled at 3-5m / min, and a guide wheel assembly is installed at the front end of the hose. The guide wheel assembly includes three groups of elastic guide wheels distributed at an angle of 120 degrees to each other, and the outer diameter of each group of guide wheels is 5-8mm smaller than the inner diameter of the underground pipe network; when the hose is transported to the position of the pipe network to be repaired, the internal pressure of the hose is monitored in real time by a pressure sensor located at one end of the hose, and the inflation device is started to inject compressed air with a temperature of 30-35°C into the hose. The injection pressure of the compressed air is gradually increased from 0.2MPa to 0.4-0.6MPa, and the pressure increase rate is controlled at 0.05MPa / min; during the compressed air injection process, the unfolding state of the hose is monitored by an endoscopic camera arranged in the pipe network. Under the action of compressed air, the hose is gradually unfolded from a folded state until it completely fits the inner wall of the pipe network, wherein the gap between the hose and the inner wall of the pipe network is controlled within the range of 0.5-1.0mm; during the unfolding process, the centering of the hose is ensured by the guide wheel assembly and a plurality of groups of spaced positioning rings, the positioning rings are made of nylon, the spacing is 1.5-2 meters, and the outer diameter of the positioning rings is 2-3mm smaller than the inner diameter of the pipe network; the inflation pressure is kept stable for 15-20 minutes to ensure that the hose is fully fitted to the inner wall of the pipe network, and the presence of wrinkles and bubbles is confirmed by observing with the endoscopic camera.

[0081] S5: starting the UV curing lamp to move along the axial direction of the hose to cure the UV curing resin, thereby completing the pipe network repair.

[0082] The UV curing lamp is connected to the transmission motor through a curing lamp traction device. The UV curing lamp adopts an LED light source with a wavelength of 365-405nm and a light source power density of 80-120mW / cm 2, the outer wall of the UV curing lamp is provided with 8 groups of LED lamp bead arrays evenly distributed along the circumference, and each group of LED lamp bead arrays contains 12 independently controllable lamp bead units; the transmission motor drives the UV curing lamp to move uniformly along the axial direction of the hose at a speed of 0.3-0.5m / min, and the UV curing lamp rotates at a speed of 15-20r / min to ensure the uniformity of light; during the curing process, the temperature of the curing area is monitored in real time by temperature sensors arranged at both ends of the UV curing lamp, and the curing temperature is controlled within the range of 45-55°C. When the temperature exceeds 55°C, the control system automatically adjusts the output power of the LED lamp beads; the curing process is divided into two stages: pre-curing and deep curing. The light source power in the pre-curing stage is maintained at 50- 60%, the moving speed is 0.4-0.5m / min, in the deep curing stage, the light source power is increased to 80-100%, and the moving speed is reduced to 0.2-0.3m / min; during the movement of the curing lamp, the temperature of a point along the outer wall of the pipe network is measured every 2 meters by an infrared thermometer to ensure that the outer wall temperature does not exceed 60°C; when the UV curing lamp completes the first curing, the second curing process is carried out in the reverse direction. The light source power of the second curing is maintained at 60-70%, and the moving speed is 0.3-0.4m / min; after the two curing is completed, the curing effect is tested by the pipeline endoscope camera. The UV curing resin reaches a Shore hardness of 80-85D, there is no adhesion on the resin surface, and the bonding strength with the pipe wall is not less than 2.5MPa.

[0083] Furthermore, this embodiment also provides a folding and repairing system for an underground pipe network UV-curing hose, comprising:

[0084] A data acquisition module is used to place a measuring probe in the pipeline to be repaired, collect circumferential data and axial data of the inner wall of the pipeline, and determine the spatial coordinates of the damage position according to the circumferential data and axial data;

[0085] A hose folding module, used for folding the hose into a U shape through a pressure pump based on the spatial coordinates of the damage position;

[0086] The repair module is used to apply ultraviolet light-curing resin to the outer surface of the hose, use a vacuum pump to extract the air inside the hose to form a negative pressure state; transport the hose to the location to be repaired in the pipeline network, inject compressed air into the hose through an inflation device, so that the hose fits the inner wall of the pipeline network; start the ultraviolet light-curing lamp to move along the axial direction of the hose, cure the ultraviolet light-curing resin, and complete the pipeline network repair.

[0087] This embodiment also provides a computer device, which is suitable for the case of a method for repairing the folding of an ultraviolet light-curing hose of an underground pipeline network, and includes a memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute computer-executable instructions to implement the method for repairing the folding of an ultraviolet light-curing hose of an underground pipeline network as proposed in the above embodiment.

[0088] The computer device may be a terminal, and the computer device includes a processor, a memory, a communication interface, a display screen and an input device connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, an operator network, NFC (near field communication) or other technologies. The display screen of the computer device may be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device may be a touch layer covering the display screen, or a key, trackball or touchpad provided on the housing of the computer device, or an external keyboard, touchpad or mouse, etc.

[0089] This embodiment also provides a storage medium on which a computer program is stored. When the program is executed by a processor, the method for folding and repairing an ultraviolet light-curing hose of an underground pipe network as proposed in the above embodiment is implemented.

[0090] The storage medium proposed in this embodiment and the data storage method proposed in the above embodiment belong to the same inventive concept. The technical details not fully described in this embodiment can be found in the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0091] Example 2

[0092] This is the second embodiment of the present invention, which provides a method for folding and repairing an underground pipe network UV-curing hose. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through economic benefit calculation and simulation experiments.

[0093] A DN600 underground sewage pipe network of a chemical plant was selected as the test object. The pipe network has been in service for 15 years and has multiple corrosion damages. First, a comprehensive inspection of the pipeline was carried out using an intelligent measurement probe equipped with 24 high-precision laser rangefinders (8 groups × 3 axes). The probe was connected to the external drive device through a carbon fiber composite telescopic rod. The measurement probe moved at a constant speed of 0.2m / s, recording a set of data every 10cm, and a total of 150m of pipe section data was collected.

[0094] After data collection is completed, data processing is performed through the control system. Application of pipeline section characteristic index (CSI) analysis shows that the most serious deformation occurs at 87.5 meters from the starting point, and the pressure correction coefficient at this location is 0.35. Further analysis of the axial strain index (ASI) confirmed that the actual strain value in this area exceeds the allowable strain value by 46%, and the weight coefficient is 0.62. Combined with the calculation results of the stress concentration factor (SCF), the maximum stress value at this location reaches 2.8 times the nominal stress value, and the comprehensive stress coefficient is 0.42.

[0095] Based on the collected data, the pipeline comprehensive damage rating index (CDR) was calculated. Considering the long service life of the pipeline, the degradation rate coefficient was taken as 0.1. The calculation showed that the CDR value of the main damage area was 0.72, which was a serious damage level. The spatial coordinates of the damage location were determined by three-dimensional modeling, and it was found that the damage area was distributed in a band, spanning 3 measurement sections and covering about 85° circumferentially.

[0096] According to the damage, a high-strength modified epoxy resin-based composite hose was selected for repair. The hose has an outer diameter of 595mm, a wall thickness of 4.5mm, and a length of 12 meters. Before curing the resin coating, the folding reference point is first located according to the spatial coordinates of the damage position, and an asymmetric U-shaped folding scheme with a gradual curvature is adopted. The folding angle at the main damage is set to 165°, and the angle of the transition section at both ends is 140°. The repaired pipeline was measured and the following data was obtained:

[0097] Table 1 Pipeline repair process parameters and performance test data

[0098]

[0099] It can be seen that when the folding angle is within the range of 160-165°, the bonding strength of the repaired pipe reaches 2.8-2.9MPa, which is about 55% higher than the traditional 140° folding scheme. This is mainly due to the improved asymmetric folding design, which makes the resin distribution more uniform and the stress transfer more reasonable.

[0100] The experimental group maintained a resin viscosity in the range of 920-1050mPa·s, which provided better permeability and adhesion than the standard value of 800mPa·s in the control group. In particular, in the T-02 test, the viscosity of 1000mPa·s combined with a negative pressure of -0.07MPa achieved the best wetting effect.

[0101] The use of a negative pressure range of -0.055MPa to -0.075MPa, combined with an inflation pressure of 0.45-0.52MPa, significantly improved the repair effect. Data showed that this pressure combination generally increased the leakage pressure to 1.1-1.3MPa, far exceeding the 0.8MPa of the control group.

[0102] Comprehensive analysis shows that the optimized process parameter combination significantly improves the repair effect, with the average bonding strength increased by about 50% and the leakage pressure increased by about 55%. This improvement is attributed to the precise damage assessment system and parameter optimization design based on the assessment results.

[0103] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for repairing the folding of an underground pipe network UV-curing hose, characterized in that: include: A measuring probe is placed in the pipeline to be repaired to collect circumferential data and axial data of the inner wall of the pipeline, and the spatial coordinates of the damage position are determined according to the circumferential data and axial data; Based on the spatial coordinates of the damage position, folding the hose into a U shape by a pressure pump; Applying ultraviolet curing resin to the outer surface of the hose, and using a vacuum pump to extract the air inside the hose to form a negative pressure state; The hose is transported to the location of the pipe network to be repaired, and compressed air is injected into the hose through an inflation device to make the hose fit the inner wall of the pipe network; The ultraviolet curing lamp is started to move along the axial direction of the hose to cure the ultraviolet curing resin, thereby completing the pipe network repair.

2. The method for repairing the folding of the UV-curing hose of the underground pipe network according to claim 1, characterized in that: Determining the spatial coordinates of the damage location based on a comprehensive damage assessment index includes: Taking the center of the pipeline inlet end face as the coordinate origin, establish the Z axis along the axial direction of the pipeline, establish the Y axis vertically upward, and establish the X axis perpendicular to the YZ plane to form a right-handed rectangular coordinate system; on each measuring section, sort the measurement data of eight groups of laser rangefinders according to the angular position and compare them with the standard circular section; when the comprehensive damage assessment index values ​​of three or more adjacent measuring points exceed 1.5 times the average value of the section, the closed area formed by the connecting lines of these measuring points is defined as a suspected damage area; when suspected damage areas appear in three or more axially adjacent measuring sections, and the circumferential position overlap of the suspected areas exceeds 60%, these areas are regarded as preliminary damage areas; For each preliminary damage area, calculate its circumferential boundary and axial boundary respectively. When the change rate of the comprehensive damage assessment index value of adjacent measuring points exceeds 30%, the position is marked as the circumferential boundary point; the determination of the axial boundary is based on the distribution curve of the comprehensive damage assessment index value of the continuous measurement section. When the absolute value of the slope of the curve is less than 0.1, the section position is marked as the axial boundary; determine the damage area; In the determined damage area, the difference between the actual radius value and the nominal radius value of each measuring point is defined as the damage depth; the position coordinates of the maximum damage depth point are determined by statistical analysis of the depth values ​​of all measuring points in the damage area; at the same time, the center of gravity position of the damage area is calculated and used as the representative coordinates of the damage center point, i.e., the damage position spatial coordinates.

3. The method for repairing the folding of the UV-curing hose of the underground pipe network according to claim 2, characterized in that: The calculation of the comprehensive damage assessment index is shown in the following formula: CDR=α1·CSI+α2·ASI+α3·SCF+α4·f(t) Among them, α1, α2, α3, α4 are weight coefficients, and f(t) is the time-dependent material degradation function: Where t is the service time of the pipeline, η is the degradation rate coefficient, SCF crit is the critical stress concentration factor, CSI is the pipe section characteristic index, ASI is the axial strain index, SCF is the stress concentration factor, and CDR is the comprehensive damage assessment index.

4. The method for repairing the folding of the UV-curing hose of the underground pipe network according to claim 3, characterized in that: The calculation of the pipeline cross-sectional characteristic index CSI is shown in the following formula: Among them, r i is the actual radius value of the i-th measuring point, r nom is the nominal radius of the pipeline, n is the number of measuring points, k is the pressure correction coefficient, Δp i is the pressure difference at the measuring point; The calculation of the axial strain index ASI is shown below: Among them, ∈ j is the actual strain value at the jth point, ∈ allow is the allowable strain value, m is the number of axial measuring points, and θ is the weight coefficient.

5. The method for repairing the folding of the UV-curing hose of the underground pipe network according to claim 4, characterized in that: Folding the hose into a U-shape comprises: A folding reference point is established according to the spatial coordinates of the damage position. When the damage area spans multiple sections, the coordinates of the damage center point are selected as the main positioning point, and the center position of the U-shaped fold is determined based on this, and 1.5 times the damage length is extended outward at both ends of the damage area as a transition section; When there is a single point damage and the CDR value is within the range of 0.3-0.6, a standard symmetrical U-shaped folding is adopted, the folding angle is maintained between 120°-150°, the radius of curvature is 4-5 times the diameter of the tube, and the two arms of the U-shape are of equal length; when the CDR value exceeds 0.6 or the damaged area is distributed in blocks, the folding angle is enlarged to 150°-170° at the damaged position, the radius of curvature is increased to 5-6 times the diameter of the tube, the two arms of the U-shape are appropriately unequal in length, but the length difference does not exceed 10% of the total length; when there are multiple points of damage or the damage is distributed in a band, a curvature gradient section is set along the damage distribution direction, the angle at the main damage is 160°-170°, and the angle at the secondary damage is reduced to 130°-150°.

6. The method for repairing the folding of the UV-curing hose of the underground pipe network according to claim 5, characterized in that: Applying the ultraviolet curing resin to the outer surface of the hose comprises: The ultraviolet curing resin containing acrylate is evenly coated on the outer surface of the hose by an automatic spraying device, the viscosity of the ultraviolet curing resin is controlled between 800-1200 mPa·s, the coating thickness is 2-3 mm, the spraying speed of the automatic spraying device is 0.8-1.2 m / min, and the spraying pressure is maintained at 0.3-0.5 MPa; The hose shrinks under negative pressure to form a folded state that is 30% to 40% smaller than the inner diameter of the underground pipe network; the hose under negative pressure is connected to the conveying pipeline through a sealing connector, and the sealing connector adopts a double-layer sealing ring structure, the inner sealing ring is made of nitrile rubber, and the outer sealing ring is made of fluororubber.

7. The method for repairing the folding of the UV-curing hose of the underground pipe network according to claim 6, characterized in that: The hose is transported to the location of the pipe network to be repaired by an electric winch; The electric winch is connected to the hose in a negative pressure state through a traction rope, and a guide wheel assembly is installed at the front end of the hose. The guide wheel assembly includes three groups of elastic guide wheels distributed at an angle of 120 degrees to each other. The outer diameter of each group of guide wheels is 5-8mm smaller than the inner diameter of the underground pipeline.

8. The method for repairing the folding of the UV-curing hose of the underground pipe network according to claim 7, characterized in that: The curing process includes a pre-curing stage and a deep curing stage; In the pre-curing stage, the light source power is maintained at 50% to 60%, and the moving speed is 0.4-0.5 m / min; in the deep curing stage, the light source power is increased to 80% to 100%, and the moving speed is reduced to 0.2-0.3 m / min.

9. A folding and repairing system for UV-curing hoses of underground pipe networks, based on the folding and repairing method for UV-curing hoses of underground pipe networks according to any one of claims 1 to 8, characterized in that: include: A data acquisition module is used to place a measuring probe in the pipeline to be repaired, collect circumferential data and axial data of the inner wall of the pipeline, and determine the spatial coordinates of the damage position according to the circumferential data and axial data; A hose folding module, used for folding the hose into a U shape through a pressure pump based on the spatial coordinates of the damage position; A repair module is used to apply ultraviolet curing resin to the outer surface of the hose, use a vacuum pump to extract the air inside the hose to form a negative pressure state; transport the hose to the location of the pipe network to be repaired, and inject compressed air into the hose through an inflation device to make the hose fit the inner wall of the pipe network; The ultraviolet curing lamp is started to move along the axial direction of the hose to cure the ultraviolet curing resin, thereby completing the pipe network repair.

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