Method for the repair of a steel strand hdpe sheath

Abstract

The embodiment of the application provides a steel strand HDPE sheath grading repair method, relates to the field of foundation construction, and the method comprises the following steps: identifying damage generated on the HDPE sheath wrapped outside the steel strand and determining the damage grade of the damage; the damage grade is divided into three levels, including slight damage, moderate damage and serious damage; according to the identified damage grade, corresponding damage repair processes are performed on the damage on the HDPE sheath; wherein when the damage is slight damage, the damage position is repaired by using waterproof adhesive tape; when the damage is moderate damage, the damage position is repaired by using a spare PE strip based on a hot melt repair method; when the damage is serious damage, the steel strand in the HDPE sheath is first subjected to drying and rust removal treatment, and then the damage position is repaired by using a spare PE strip based on the hot melt repair method. By applying the embodiment of the application, the repair quality of the HDPE sheath can be ensured, and the repair cost and construction period can be saved.

Description

Technical Field

[0001] This application relates to the field of basic construction technology, and in particular to a graded repair method for HDPE sheaths of steel strands. Background Technology

[0002] In practical engineering applications, HDPE (High Density Polyethylene) sheaths are generally used to protect unbonded prestressed steel strands. However, HDPE sheaths may be damaged during transportation and threading. When the HDPE sheath is damaged, the anti-corrosion grease coated on the steel strands will be lost, causing the steel strands to rust and severely affecting their durability.

[0003] Currently, when HDPE sheath damage is discovered, the usual approach is either to replace the entire steel strand or simply bandage the damaged area. The former is costly and time-consuming, while the latter is unreliable in its repair effectiveness. Therefore, there is currently a lack of a standardized repair solution for HDPE sheaths that is cost-effective and reliable. Summary of the Invention

[0004] The purpose of this application is to provide a graded repair method for HDPE sheaths of steel strands, so as to save repair costs and construction time while ensuring the repair quality of HDPE sheaths. The specific technical solution is as follows: This application provides a graded repair method for HDPE sheath of steel strand, including: Identify damage to the HDPE sheath surrounding the steel strand and determine the damage level; the damage level is divided into three grades, including minor damage, moderate damage, and severe damage. Based on the identified damage level, corresponding damage repair processes are performed on the HDPE sheath. Specifically, for minor damage, waterproof tape is used to repair the damaged area; for moderate damage, a spare PE strip is used to repair the damaged area based on the hot melt repair method; and for severe damage, the steel strands inside the HDPE sheath are first dried and derusted, and then the damaged area is repaired using a spare PE strip based on the hot melt repair method.

[0005] Optionally, the aforementioned determination of the damage level includes: Determine the size of the damage at the location of the injury, and whether there is any exposed steel strand at the location of the injury; If the size of the break does not exceed the preset size and there is no exposed steel strand at the damaged location, the damage is determined to be minor. When the damaged size exceeds the preset size and there is no exposed steel strand at the damaged location, the damage is determined to be moderate damage; When the steel strand is exposed at the site of damage, the damage is determined to be severe.

[0006] Optionally, the aforementioned repair of the damaged area using waterproof tape includes: Apply at least two layers of waterproof tape to the damaged area, ensuring that the length of the tape exceeds the length of the damage by at least 30 mm, and that the overlap width between each layer of waterproof tape is not less than 1 / 2 of the width of the waterproof tape.

[0007] Optionally, the waterproof tape may be polyethylene tape or polyvinyl chloride wrapping tape.

[0008] Optionally, the aforementioned hot-melt repair method involves repairing the damaged area using a spare PE strip, including: Cover the damaged area with a PE strip and heat the PE strip with a welding torch until the PE strip and the HDPE sheath material at the damaged area melt and fuse together. Then allow the fused PE material to cool naturally.

[0009] Optionally, the above-mentioned graded repair method for the HDPE sheath of steel strands also includes: After the fused PE material cools, the repair surface formed by the cooled PE material is polished to restore the thickness of the HDPE sheath at the damaged location to its original thickness.

[0010] Optionally, during the process of heating the PE strip with a welding torch, the target heating temperature set for the welding torch is within a preset first temperature range; The first temperature range is the range of heating temperatures that enable the PE material sample to meet the target conditions, determined by the test results after heating the PE material sample. The PE material sample and the HDPE sheath are made of the same material. The target condition is that when the PE material sample is heated at the set heating temperature, the PE material sample can be completely melted without carbonization.

[0011] Optionally, when the damage is severe, the aforementioned drying and rust removal treatment of the steel strands inside the HDPE sheath includes: The HDPE sheath at the damaged location was partially peeled off to expose the steel strands inside the damaged area. The exposed steel strands are dried using high-pressure hot air, and then the oil and rust covering the steel strands are removed.

[0012] Optionally, the aforementioned identification of damage to the HDPE sheath surrounding the steel strand and determination of the damage level includes: Acquire real-time images of the HDPE sheath captured by the pre-installed monitoring camera; Real-time images are input into a pre-trained damage monitoring model, enabling the model to identify damage on the HDPE sheath based on the real-time images, determine the damage level, and then output the corresponding model processing results. The model processing results include: bounding boxes indicating the location of the identified damage on the HDPE sheath, the damage level, and repair prompts for the damage. The repair prompts suggest performing a damage repair process appropriate to the damage level.

[0013] Optionally, the damage monitoring model identifies damage present on the HDPE sheath and determines the damage level based on the following: Semantic segmentation is performed on real-time images to distinguish between intact and damaged areas on the surface of the HDPE sheath. Edge detection and contour extraction are performed on real-time images within the damaged area to obtain the damage contour at the damage location, and the damage size is determined based on the damage contour. Texture recognition is performed on real-time images within the damaged area to determine whether there is any exposed steel strand within the damaged area; Based on the determined damage dimensions and the assessment of the exposed steel strands, the damage level of the damaged area is determined.

[0014] The beneficial effects of this application are: The graded repair method for HDPE sheaths of steel strands provided in this application classifies damage into three different levels: minor damage, moderate damage, and severe damage, based on the varying severity of the damage to the HDPE sheath. A corresponding repair process is defined for each damage level. Specifically, the repair process for minor damage involves repairing the damaged area with waterproof tape; the repair process for moderate damage involves repairing the damaged area using a spare PE strip based on the hot-melt repair method; and the repair process for severe damage involves first drying and derusting the steel strands inside the HDPE sheath, and then repairing the damaged area using a spare PE strip based on the hot-melt repair method.

[0015] Based on the graded repair method for HDPE sheaths of steel strands provided in this application, when damage actually occurs to the HDPE sheath, the specific damage level is identified, and the damage is repaired according to the corresponding damage repair process. This allows for precise repair of HDPE sheaths with varying degrees of damage, tailored to their respective damage levels. By pre-differentiating different damage levels and applying corresponding graded repair processes, it avoids increased costs and extended construction periods due to over-repairing minor damage, and also avoids quality problems caused by inadequate repair of severe damage. This helps to ensure the quality of HDPE sheath repair while saving on repair costs and construction time.

[0016] Of course, implementing any product or method of this application does not necessarily require achieving all of the advantages described above at the same time. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, 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 this application. For those skilled in the art, other embodiments can be obtained based on these drawings.

[0018] Figure 1 This is a flowchart illustrating the graded repair method for HDPE sheath of steel strand provided in this application embodiment. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art based on this application are within the scope of protection of this application.

[0020] In practical engineering applications, HDPE sheaths are generally used to protect unbonded prestressed steel strands. However, HDPE sheaths may be damaged during transportation and threading. When the HDPE sheath is damaged, the anti-corrosion grease coated on the steel strands will be lost, causing the steel strands to rust and severely affecting their durability.

[0021] Currently, when HDPE sheath damage is discovered, the usual approach is either to replace the entire steel strand or simply bandage the damaged area. The former is costly and time-consuming, while the latter is unreliable in its repair effectiveness. Therefore, there is currently a lack of a standardized repair solution for HDPE sheaths that is cost-effective and reliable.

[0022] In view of this, this application provides a graded repair method for HDPE sheaths of steel strands. Based on this graded repair method, differentiated repairs can be performed according to the degree of damage on the HDPE sheath, thereby saving repair costs and time while ensuring repair quality. The graded repair method is described in detail below; see [link to relevant documentation]. Figure 1 The method specifically includes the following steps: Step S101: Identify the damage to the HDPE sheath surrounding the steel strand and determine the damage level; the damage level is divided into three levels, including minor damage, moderate damage, and severe damage.

[0023] Specifically, when the HDPE sheath shows slight wear and micro-cracks on the surface, but no exposed steel strands, the damage to the HDPE sheath can be considered minor. When the wear, cracking, or breakage of the HDPE sheath is severe enough to weaken its ability to protect the steel strands, posing a risk of exposed steel strands during use, the damage to the HDPE sheath can be considered moderate. When the wear, cracking, or breakage of the HDPE sheath is very severe, causing it to lose its ability to protect the steel strands and resulting in exposed steel strands, the damage to the HDPE sheath can be considered severe.

[0024] In some embodiments of this application, a quantifiable evaluation standard can be set for damage on the HDPE sheath, and the damage level on the HDPE sheath can be determined based on the evaluation standard.

[0025] In one example, the damage level on the HDPE sheath can be determined based on the size of the damage at the location of the injury and whether there is any exposed steel strand. If the damage size does not exceed a preset size and there is no exposed steel strand, the damage is classified as minor; if the damage size exceeds the preset size and there is no exposed steel strand, the damage is classified as moderate; and if exposed steel strand is present, the damage is classified as severe.

[0026] The preset size used to define minor and moderate damage can be set according to actual needs, and this application embodiment does not impose explicit limitations on it. For example, the preset size may include at least one of preset damage width, preset damage length, and preset damage area; when there is no exposed steel strand, if the damage location satisfies at least one of the following conditions: damage width exceeds preset damage width, damage length exceeds preset damage length, and damage area exceeds preset damage area, the corresponding damage can be determined as moderate damage.

[0027] Step S102: Based on the identified damage level, perform the corresponding damage repair process on the HDPE sheath; where, when the damage is minor, use waterproof tape to repair the damaged area; when the damage is moderate, use spare PE (Polyethylene) strips to repair the damaged area based on the hot melt repair method; when the damage is severe, first dry and remove rust from the steel strands inside the HDPE sheath, and then use spare PE strips to repair the damaged area based on the hot melt repair method.

[0028] As can be seen, this application defines corresponding on-site repair processes for three damage levels (minor damage, moderate damage, and severe damage) on the HDPE sheath. For minor damage, the corresponding on-site repair process is defined as waterproof tape wrapping. For moderate damage, considering that moderate damage may lead to the exposure of the steel strands during use, thereby affecting the safe use of the steel strands and increasing structural safety hazards, the corresponding on-site repair process is defined as using PE strips for hot-melt repair. For severe damage, considering that when the HDPE sheath is severely damaged, rainwater may have seeped into the exposed steel strands, the corresponding on-site repair process is defined as first drying and derusting the steel strands, and then using PE strips for hot-melt repair.

[0029] In some embodiments of this application, for minor damage, when repairing with waterproof tape wrapping, at least two layers of waterproof tape can be wrapped around the damaged area, ensuring that the wrapping length of the waterproof tape exceeds the damaged length on the HDPE sheath by at least 30 mm, and the overlap width between each layer of waterproof tape is not less than 1 / 2 of the width of the waterproof tape.

[0030] In practical engineering applications, it is important to ensure that the waterproof tape applied to the damaged area meets the requirements for sealing and corrosion protection. For example, the HDPE sheath surface at the damaged location can be cleaned before applying the waterproof tape. Cleaning the HDPE sheath surface ensures that the subsequently applied waterproof tape adheres tightly to the HDPE sheath surface, thereby improving the sealing and corrosion protection performance after repair.

[0031] In one example, the waterproof tape could be waterproof polyethylene tape or polyvinyl chloride (PVC) wrapping tape.

[0032] In some embodiments of this application, for moderate / severe damage, when using PE strips for hot melt repair, the PE strip can be covered on the damaged area, and a welding torch can be used to weld the covered PE strip to the HDPE sheath material at the damaged area. The welding torch is used to heat the PE strip until it melts and fuses with the HDPE sheath material at the damaged area, and then the fused PE material is allowed to cool naturally.

[0033] For example, after covering the damaged area with a PE strip, a special clamp can be used to fix the PE strip and HDPE sheath to prevent the PE strip from shaking during welding and affecting the damage repair result. Then, the welding gun is powered on and heated to the preset heating temperature to melt the PE material. The heating is continued until the PE strip and the HDPE sheath material at the damaged area are completely melted and fused together. Then, the welding gun is powered off and the special clamp is removed after power is turned off, allowing the fused PE material to cool down naturally.

[0034] In one example, when preparing PE strips for repairing damage to HDPE sheaths, it's advisable to choose PE strips of the same color and material as the HDPE sheath to improve the repair effect. The size of the PE strip can be determined based on the size of the damaged area to be repaired.

[0035] In one example, after the PE strip and the HDPE sheath material at the damaged location are melted and fused together by heating with a welding torch, and after the fused PE material has cooled, a grinder can be used to polish the repair surface formed at the damaged location, so that the thickness of the HDPE sheath at the damaged location is restored to its original thickness. The original thickness of the HDPE sheath, that is, the thickness of the HDPE sheath in its undamaged, intact state, can be restored to its original smooth state by polishing the repair surface of the HDPE sheath.

[0036] In addition, when welding the PE strip to the HDPE sheath material at the damaged location using a welding torch, attention should be paid to the heating temperature used when operating the welding torch. It should be ensured that there is no under-melting phenomenon caused by insufficient heating temperature (that is, the PE strip and the HDPE sheath material at the damaged location cannot be completely melted), nor should the PE material be carbonized due to excessive heating temperature, and bubbles are not allowed to appear on the repair surface.

[0037] In one example, to ensure that the heating temperature during welding is set within a reasonable range and that the welding effect meets the requirements listed in the previous paragraph, during the welding process of the PE strip and the HDPE sheath material at the damaged location using a welding torch, the target heating temperature set for the welding torch can be set within a preset first temperature range.

[0038] The first temperature range is the range of heating temperatures that enable the PE material sample to meet the target conditions, determined based on the test results after heating the PE material sample. Specifically, the PE material sample and the HDPE sheath are made of the same material, and the target condition is that when the PE material sample is heated to the corresponding heating temperature, the PE material sample can completely melt without carbonization.

[0039] By conducting heating tests on PE material samples made of the same material as the HDPE sheath, and setting the target heating temperature range of the welding torch during welding operations based on the test results, it can be ensured that when welding the PE strip to the HDPE sheath material at the damaged location based on the set target heating temperature, there will be no undercooking caused by insufficient heating temperature, nor material carbonization caused by excessive heating temperature, thus helping to ensure the damage repair effect.

[0040] In some embodiments of this application, for severe damage, when drying and removing rust from the steel strand, the HDPE sheath at the damaged location can be partially peeled off first to expose the steel strand inside the damaged location; after exposing the steel strand inside the damaged location, high-pressure hot air is used to dry the exposed steel strand, and then the oil and rust covering the steel strand are removed.

[0041] As mentioned earlier, when the HDPE sheath is severely damaged, it means that the steel strands are exposed at the damaged location. This exposes the steel strands to the external environment, making them susceptible to corrosion from sources such as rainwater, leading to rust. In such cases, a small section of the HDPE sheath around the damaged area can be partially peeled off to expose the corroded steel strands. The exposed steel strands can then be dried and derusted to ensure their safety in subsequent use.

[0042] As can be seen from the above description, the graded repair method for HDPE sheath of steel strand provided in this application defines three damage levels (minor damage, moderate damage, and severe damage) based on three typical damage states of HDPE sheath (micro-cracks, severe damage but not exposed, and exposed). For each of these three damage levels, three different repair processes are defined and matched (waterproof tape wrapping method, hot melt repair method, and drying and rust removal + hot melt repair method). Therefore, when damage occurs to the HDPE sheath, the specific damage level can be identified and the corresponding repair process can be executed, achieving precise graded repair based on the degree of damage. This avoids "over-treatment of minor problems" or "operation with defects," saving repair costs and time while ensuring repair quality.

[0043] Furthermore, the graded repair method for HDPE sheath of steel strand provided in the embodiments of this application gives specific repair materials and process parameters for each damage level, which constitutes a systematic on-site maintenance method and provides a standardized on-site repair process, making it easy to apply in actual construction scenarios.

[0044] Furthermore, in some embodiments of this application, the specific damage state of the HDPE sheath can be detected in an automated and intelligent manner, thereby triggering the corresponding damage repair process. This can save the labor cost of implementing the above-mentioned graded repair method and improve the repair efficiency for HDPE sheaths.

[0045] In one possible implementation, the aforementioned step S101 can be achieved through the following steps a1-a2: Step a1: Acquire real-time images of the HDPE sheath captured by the pre-installed monitoring camera.

[0046] Specifically, in actual construction scenarios, monitoring cameras can be specifically installed to monitor HDPE sheaths. These cameras capture images of the HDPE sheaths in real time, allowing for the identification of any damage and timely repair of any resulting damage. For example, in scenarios where steel strands are transported by truck, a dedicated monitoring camera for HDPE sheaths can be mounted on the truck to monitor the damage to the HDPE during transportation.

[0047] Step a2: Input the real-time image into the pre-trained damage monitoring model so that the damage monitoring model can identify the damage existing on the HDPE sheath based on the real-time image, determine the damage level of the damage, and then output the corresponding model processing results.

[0048] Specifically, the damage monitoring model's processing results for the implemented image output may include: a bounding box indicating the location of the identified damage on the HDPE sheath, the damage level of the damage, and repair prompts for the damage, which are used to suggest performing a damage repair process appropriate to the damage level.

[0049] For example, after identifying damage on the HDPE sheath in a real-time image, the damage monitoring model can mark the identified damage with a bounding box on the real-time image, output the real-time image containing the bounding box, and output repair prompts indicating the damage level via voice and / or image. Thus, relevant personnel can promptly repair the corresponding damage marked with the bounding box based on the repair prompts provided by the damage monitoring model.

[0050] In this embodiment of the application, the specific model category and specific identification mechanism of the damage monitoring model used to identify damage and its level on HDPE sheath are not described. They can be selected according to actual needs.

[0051] In one possible implementation, YOLO (You Only Look Once, a neural network model) can be selected as the damage monitoring model in the embodiments of this application.

[0052] In one example, the damage monitoring model can specifically identify damage on the HDPE sheath in real-time images and determine the damage level of the corresponding damage based on the following steps b1-b2: Step b1: Perform semantic segmentation on the real-time image to distinguish between intact and damaged areas on the HDPE sheath surface within the real-time image.

[0053] For example, multiple sample images of HDPE sheaths with surface damage can be pre-acquired, and the damaged and intact areas on the HDPE sheaths can be marked on the sample images. Then, the semantic segmentation capability of the damage monitoring model can be trained using the marked sample images, so that the trained model can segment the damaged and intact areas of the HDPE sheaths in real-time images.

[0054] Step b2: Perform edge detection and contour extraction on the real-time image within the damaged area to obtain the damage contour at the damage location, and determine the damage size based on the damage contour.

[0055] Specifically, edge detection can be performed on real-time images within the damaged area to identify the edge points of the damage on the HDPE sheath within the damaged area, and further contour extraction can be performed based on the edge detection results to determine the specific damage contour.

[0056] Based on the obtained damage contour, the damage size of the corresponding damage can be determined. This application does not specifically limit the implementation method of determining the damage size based on the damage contour; it can be selected according to actual needs. In one example, the monitoring camera can be configured as a depth camera, and the damage size of the damage contour can be determined by combining the depth information and pixel size information of the damage contour on the real-time image. In another example, multiple size reference marks arranged sequentially at intervals along their extension direction can be pre-drawn on the HDPE sheath; after determining the damage contour, the proportional conversion relationship between the pixel size and the actual size is determined based on the pixel size of the size reference mark closest to the damage contour and the actual size of a pre-calibrated single size parameter mark; then, the damage size of the corresponding damage on the HDPE sheath is determined based on the pixel size of the damage contour and this proportional conversion relationship.

[0057] Step b3: Perform texture recognition on the real-time image within the damaged area to determine whether there is any exposed steel strand within the damaged area.

[0058] Specifically, texture recognition can be performed on the image within the damaged area to determine whether pixels with a "steel strand" type texture exist within the damaged area. If they do, it is considered that there is exposed steel strand within the damaged area; if they do not, it is considered that there is no exposed steel strand within the damaged area. In one example, the damage monitoring model can be set to identify texture areas with features such as spiral patterns or metallic reflections as "steel strand" type textures.

[0059] Step b4: Based on the determined damage size and the judgment results regarding the exposed steel strand, determine the damage level of the damaged area.

[0060] As mentioned above, the damage can be classified as minor if the damaged size does not exceed the preset size and there is no exposed steel strand in the damaged area; moderate if the damaged size exceeds the preset size and there is no exposed steel strand in the damaged area; and severe if exposed steel strand is found at the damaged location.

[0061] In this embodiment, a monitoring camera is used to acquire images of the HDPE sheath in real time. Machine learning methods are then used to identify damage to the HDPE sheath based on these real-time images and determine the damage level of each type of damage. This allows for timely detection and identification of damage to the HDPE sheath in actual construction scenarios, facilitating prompt repair of damaged HDPE sheaths. This helps ensure the safety of the steel strand and reduces the labor costs associated with regular manual inspections of HDPE sheath damage.

[0062] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0063] The various embodiments in this specification are described in a related manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0064] The above description is merely a preferred embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.

Claims

1. A graded repair method for HDPE sheath of steel strand, characterized in that, include: Identify damage to the HDPE sheath surrounding the steel strand and determine the damage level of the damage. Injury is classified into three levels: minor injury, moderate injury, and severe injury. Based on the identified damage level, corresponding damage repair processes are performed on the HDPE sheath. Specifically, when the damage is minor, waterproof tape is used to repair the damaged area; when the damage is moderate, a spare PE strip is used to repair the damaged area based on the hot melt repair method; when the damage is severe, the steel strands inside the HDPE sheath are first dried and derusted, and then the damaged area is repaired using a spare PE strip based on the hot melt repair method.

2. The method according to claim 1, characterized in that, Determining the damage level of the damage includes: Determine the size of the damage at the location of the injury, and whether there is any exposed steel strand at the location of the injury; If the size of the break does not exceed the preset size and there is no exposed steel strand at the damaged location, the damage is determined to be minor damage. When the damaged size exceeds the preset size and there is no exposed steel strand at the damaged location, the damage is determined to be moderate damage. When the steel strand is exposed at the site of damage, the damage is determined to be severe.

3. The method according to claim 1, characterized in that, The repair of the damaged area using waterproof tape includes: Apply at least two layers of waterproof tape to the damaged area, ensuring that the length of the tape exceeds the length of the damage by at least 30 mm, and that the overlap width between each layer of waterproof tape is not less than 1 / 2 of the width of the waterproof tape.

4. The method according to claim 3, characterized in that, The waterproof tape is polyethylene tape or polyvinyl chloride wrapping tape.

5. The method according to claim 1, characterized in that, The aforementioned hot-melt repair method, which uses a spare PE strip to repair the damaged area, includes: Cover the damaged area with the PE strip and heat the PE strip with a welding torch until the PE strip and the HDPE sheath material at the damaged area melt and fuse together. Then allow the fused PE material to cool naturally.

6. The method according to claim 5, characterized in that, The method further includes: After the fused PE material cools, the repair surface formed by the cooled PE material is polished to restore the thickness of the HDPE sheath at the damaged location to its original thickness.

7. The method according to claim 5, characterized in that, During the process of heating the PE strip with a welding torch, the target heating temperature set for the welding torch is within a preset first temperature range; The first temperature range is the range of heating temperatures that enable the PE material sample to meet the target conditions, determined by the test results after heating the PE material sample. The PE material sample and the HDPE sheath are made of the same material. The target condition is that when the PE material sample is heated at the set heating temperature, the PE material sample can be completely melted without carbonization.

8. The method according to claim 1, characterized in that, When the damage is severe, the drying and rust removal treatment of the steel strands inside the HDPE sheath includes: The HDPE sheath at the damaged location is partially peeled off to expose the steel strands inside the damaged location; The exposed steel strands are dried using high-pressure hot air, and then the oil and rust covering the steel strands are removed.

9. The method according to claim 2, characterized in that, The identification of damage occurring on the HDPE sheath surrounding the steel strand, and the determination of the damage level, includes: Acquire real-time images of the HDPE sheath captured by the pre-installed monitoring camera; The real-time image is input into a pre-trained damage monitoring model, which identifies damage on the HDPE sheath based on the real-time image, determines the damage level of the damage, and then outputs the corresponding model processing results. The model processing results include: a bounding box indicating the location of the identified damage on the HDPE sheath, the damage level of the damage, and repair prompts for the damage. The repair prompts suggest performing a damage repair process appropriate to the damage level.

10. The method according to claim 9, characterized in that, The damage monitoring model identifies damage present on the HDPE sheath and determines the damage level based on the following method: Semantic segmentation is performed on the real-time image to distinguish between intact and damaged areas on the surface of the HDPE sheath. Edge detection and contour extraction are performed on the real-time image within the damaged area to obtain the damage contour at the damage location, and the damage size is determined based on the damage contour. Texture recognition is performed on real-time images within the damaged area to determine whether there is any exposed steel strand within the damaged area; Based on the determined damage size and the assessment of the exposed steel strand, the damage level of the damaged area is determined.

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