A high-reliability buried cable intelligent laying and state monitoring integrated construction method suitable for a complex chemical plant area

Abstract

The application provides a high-reliability buried cable intelligent laying and state monitoring integrated construction method suitable for complex chemical plant areas, relates to the technical field of power and petrochemical engineering construction, and comprises the following steps: BIM-based intelligent laying path planning, standardized laying operation, real-time data acquisition and digital twin body construction, monitoring activation and health baseline establishment; the application outputs a construction instruction diagram with accurate spatial coordinates through BIM three-dimensional collision detection and optimal path planning, can identify underground hidden pipe networks in advance and actively avoid, avoids construction digging accidents and temporary detour problems from the source, ensures that the completed path is highly consistent with the design path, solves the industry pain point that the traditional completion drawing does not conform to the actual laying, and adopts a cable and distributed optical fiber sensing optical cable synchronous laying process to accurately control the spacing between the optical cable and the cable, greatly improves the resolution and positioning accuracy of temperature and strain monitoring.

Description

Technical Field

[0001] This invention relates to the field of power and petrochemical engineering construction technology, and in particular to an integrated construction method for intelligent laying and condition monitoring of highly reliable buried cables suitable for complex chemical plant areas. Background Technology

[0002] In large-scale chemical construction projects, power supply, control, and instrumentation signal cables are mostly laid underground using direct burial or protective conduits. Currently, the industry has applied BIM technology to pipeline collision detection, RTK technology to site topographic mapping, and distributed fiber optic sensing technology is gradually being used for online monitoring of cable operating status. These technologies have played a certain role in their respective independent construction or operation and maintenance stages.

[0003] However, BIM is only used for preliminary collision detection and report generation, and cannot output precise coordinates that can directly guide construction. When the underground pipeline network is complex, temporary rerouting is prone to occur, resulting in a large deviation between the final as-built drawings and the actual laying path. It is also difficult to accurately locate cable faults. Fiber optic monitoring is mostly added after the cable is put into operation, and the distance between the fiber optic cable and the cable is uncontrollable, resulting in low monitoring accuracy. Furthermore, it lacks systematic anti-interference and anti-corrosion protection measures adapted to chemical environments. RTK is only used for topographic surveying and is not linked with the BIM model, so it cannot form a high-precision digital archive that matches the actual path. Monitoring systems are mostly added after operation, and there is no initial health baseline data. They can only provide alarms after a fault and cannot provide early warning of potential hazards. At the same time, the design, construction, monitoring, and operation and maintenance are independent of each other and have not formed an integrated construction system. The long-term reliability of the cable is insufficient, and the cost of fault diagnosis and full life cycle operation and maintenance is high. Therefore, this invention proposes an integrated construction method for intelligent laying and condition monitoring of highly reliable buried cables in complex chemical plant areas to solve the problems existing in the prior art. Summary of the Invention

[0004] To address the aforementioned issues, this invention proposes an integrated construction method for intelligent laying and status monitoring of highly reliable buried cables in complex chemical plant areas. This method utilizes BIM 3D collision detection and optimal path planning to output construction instruction diagrams with precise spatial coordinates. It can proactively identify and avoid underground concealed pipelines, preventing construction digging accidents and temporary rerouting issues from the source. It ensures a high degree of consistency between the completed path and the design path, solving the industry pain point of discrepancies between traditional as-built drawings and actual laying.

[0005] To achieve the objectives of this invention, the invention is implemented through the following technical solution: a construction method for intelligent laying and condition monitoring of highly reliable buried cables suitable for complex chemical plant areas, comprising the following steps:

[0006] S1. BIM-based intelligent laying path planning: Import all underground pipe networks and structures in the construction area into the BIM model, carry out three-dimensional collision detection and optimal path planning, and generate a digital construction handover map with spatial coordinates by taking into account cable bending radius, safety distance and obstacle avoidance requirements.

[0007] S2. Standardized laying operation: Cable laying shall be carried out in accordance with the digital handover diagram, and distributed optical fiber sensing cables shall be laid simultaneously in the adjacent position of the cable, and anti-interference physical isolation and high protection level protection measures shall be implemented simultaneously.

[0008] S3. Real-time data acquisition and digital twin construction: During the laying process, RTK-GPS and IMU combined positioning equipment are used to collect the actual three-dimensional coordinates, burial depth and bending angle parameters of the cable at set intervals. The data is uploaded to the cloud and dynamically fused and corrected with the BIM model to generate a digital twin of the corresponding physical cable.

[0009] S4. Monitoring Activation and Health Baseline Establishment: After the cable laying and backfilling are completed, the fiber optic sensing system host is connected to continuously collect status parameters before formal commissioning to form the initial health baseline of the cable, which is used for subsequent abnormal operation judgment and predictive maintenance.

[0010] Further improvements are made in the following ways: Specifically, S1 involves: importing all underground structures, including process pipelines, water supply and drainage pipelines, and structural foundations, into the BIM model; using 3D collision detection to identify all path conflict points; and taking into account multiple constraints during path planning, such as the minimum bending radius of cables, safe spacing between cables of different voltage levels, avoidance of strong electromagnetic interference sources, and avoidance of corrosive soil areas. The system automatically solves for the globally optimal laying path and outputs a construction instruction diagram with XYZ 3D spatial coordinates to guide precise excavation and laying operations on site.

[0011] A further improvement is made in the following: In S2, the specific process of cable laying is as follows: the sensing optical cable is arranged close to the cable along the entire length of the cable, wherein the horizontal distance between the optical cable and the cable is controlled at 5~10cm, and the optical cable is arranged close to the top of the cable in the vertical direction, with the vertical distance controlled at 0~5cm.

[0012] Further improvements are made in the following aspects: the fixing and coiling process of the sensing optical cable adopts the following parameters: straight sections with a laying length of less than 500m are fixed with cable ties at a spacing of 1m; sections with a laying length of more than 1km and bends are fixed with adhesive and U-shaped clips at a spacing of 0.5m; and the optical cable is pre-coiled at the cable joint position with a coiling radius of not less than 30cm and a coiling length of not less than 50cm.

[0013] Further improvements are made in the following aspects: In S2, the high-level protection measures are as follows: When the cable crosses roads, pipe corridors, or other heavily loaded or easily settled areas, a composite protective pipe structure is adopted, with an inner layer of DN150 steel pipe with a wall thickness of 6mm and an outer layer of fiberglass pipe with a wall thickness of 4mm. The overall burial depth of the protective pipe is not less than 1.2m. When the cable crosses areas with highly corrosive soil, the corresponding section adopts a composite structure of DN125 steel pipe with an inner wall thickness of 5mm and an outer layer of fiberglass pipe with a wall thickness of 4mm to increase the burial depth. Neutral fine sand is used for backfilling to jointly resist soil corrosion, ground settlement, and heavy-load rolling.

[0014] Further improvements are made in the following: In S3, the specific scheme for RTK-GPS and IMU combined positioning and acquisition is as follows: one RTK-GPS base station is set up at each of the four corners of the construction area, and a network RTK mode is adopted; a coordinate point is collected every 5m along the cable laying path, and the density is increased to one point every 1m at corners, cable joints, and pipe crossings; a high-precision MEMS inertial measurement unit is used to calculate the pitch angle and roll angle in real time, and the burial depth is calculated in combination with the traction length, while the traction tension and bending angle parameters are recorded simultaneously.

[0015] Further improvements are made in the following aspects: In S3, the digital twin construction process is as follows: the real-time coordinates and construction parameters obtained are uploaded to the cloud at a frequency of 1Hz via a 4G / 5G private network, with a transmission delay of less than 200ms; the BIM fusion algorithm is used to optimally match and fuse the actual path collected in real time by the IMU with the BIM design path, and an alarm is automatically triggered when the deviation between the actual path and the design path is greater than 5cm; after dynamic correction, a high-fidelity digital twin that completely corresponds to the physical cable spatial position and parameters is generated as a digital archive for the entire life cycle of the cable.

[0016] Further improvements are made in the following: In S4, the establishment of the health baseline is specifically as follows: within 24 hours after the cable laying and backfilling is completed and within 72 hours before formal commissioning, the fiber optic sensing system is started and the cable status parameters are collected continuously for 72 hours; the sampling frequency is set as follows: temperature parameters are collected once every 10 seconds, micro-strain parameters are collected once every 30 seconds, and partial discharge parameters are collected once per minute; after the collection is completed, a multi-dimensional initial health baseline is generated, which includes temperature distribution curve, micro-strain distribution curve, and partial discharge background noise spectrum.

[0017] Further improvements are made in S4, where the abnormal operation judgment and predictive maintenance are as follows: during operation, when the temperature at any point on the cable exceeds the baseline ±3σ range, or the single-point temperature rise rate is greater than 0.5℃ / min, the system automatically triggers an alarm and accurately locates the abnormal position; the health baseline adopts a strategy that combines regular updates and forced updates, automatically updating the baseline once a quarter after commissioning, and forcibly updating the baseline data of the corresponding section within 48 hours after the cable abnormality is repaired.

[0018] The beneficial effects of this invention are as follows:

[0019] 1. This invention uses BIM 3D collision detection and optimal path planning to output construction instruction diagrams with precise spatial coordinates. It can identify underground hidden pipelines in advance and actively avoid them, thus preventing construction digging accidents and temporary rerouting problems from the source. It ensures that the completed path is highly consistent with the design path, solving the industry pain point of discrepancies between traditional as-built drawings and actual laying.

[0020] 2. This invention adopts a process of simultaneous laying of cables and distributed optical fiber sensing cables to precisely control the spacing between the optical cables and the cables, which greatly improves the resolution and positioning accuracy of temperature and strain monitoring. At the same time, it is equipped with composite protective pipes and layered physical isolation measures adapted to chemical environments to effectively resist strong electromagnetic interference, corrosive soil and ground subsidence, and improve the environmental adaptability and protection level of the cable during long-term operation.

[0021] 3. This invention uses RTK-GPS and IMU combined positioning technology to collect the three-dimensional coordinates of the cable and key construction parameters in real time during the laying process, and dynamically integrates and corrects them with the BIM model to generate a digital twin, forming a high-precision full-path digital archive; when a fault occurs, it can achieve centimeter-level accurate positioning, greatly reduce the excavation range, and improve the efficiency of fault location.

[0022] 4. This invention establishes a multi-dimensional health baseline before cable commissioning, and accurately determines abnormal deviations based on baseline data. It can identify early hidden dangers such as water ingress into cable joints, overload overheating, and external deformation in advance, transforming traditional post-event emergency repairs into predictive proactive maintenance. The fault warning accuracy is high, effectively avoiding unplanned downtime and secondary losses.

[0023] 5. This invention constructs an integrated construction system encompassing four stages: BIM planning, high-standard laying, data acquisition, and monitoring activation. It deeply integrates path design, on-site construction, digital archiving, and status monitoring, spanning the entire lifecycle of cable construction and maintenance. This reduces the overall costs associated with construction rework, emergency repairs, and production shutdowns, and comprehensively improves the overall reliability of power supply systems in chemical enterprises. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the cable laying operation according to the present invention. Detailed Implementation

[0025] To enhance understanding of the present invention, the present invention will be further described in detail below with reference to embodiments. These embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0026] Example 1

[0027] according to Figure 1As shown in the figure, this embodiment proposes an integrated construction method for intelligent laying and condition monitoring of highly reliable buried cables suitable for complex chemical plant areas:

[0028] Phase 1: BIM-based intelligent laying path planning and simulation

[0029] All underground pipe networks (process, water supply and drainage, structural foundation) in the construction area are imported into the BIM model. Professional software is used for 3D collision detection and optimal path planning. Taking into account factors such as cable bending radius, safety distance, and avoidance of strong interference sources, a digital handover map with coordinates is generated.

[0030] Compared with existing BIM technology: Traditional BIM only generates collision detection reports, while this invention further generates construction instruction diagrams with XYZ coordinates, realizing "excavation where you point".

[0031] Phase Two: Standardized Laying Operations with High Interference Resistance and Protection Levels

[0032] Construction was carried out strictly according to the digital solution, with distributed fiber optic sensing cables laid simultaneously (see...). Figure 1 The key process parameters are as follows:

[0033]

[0034] Compared to existing fiber optic cable laying methods: Traditional fiber optic cables are often installed in conduits after the cable is put into operation, and the distance between the fiber optic cable and the cable is uncontrollable. This invention allows for simultaneous laying, with a controllable distance of 5–10 cm, a measured temperature resolution of 0.5℃ (compared to approximately 2℃ for traditional installation methods), and a spatial positioning accuracy of ±0.5m.

[0035] Phase 3: Real-time data acquisition and digital twin construction

[0036] During cable laying, technicians use handheld RTK-GPS (Real-Time Dynamic Differential Global Positioning System) and IMU (Inertial Measurement Unit) combination positioning devices to record coordinates every 5 meters, with increased density measurements at corners and joints. This allows for real-time recording of key parameters such as the cable's actual three-dimensional spatial coordinates, burial depth, traction tension, and bending angle. This data is then uploaded to the cloud wirelessly for dynamic fusion and correction with the first-stage BIM model, ultimately generating a high-fidelity digital twin that perfectly corresponds to the physical cable.

[0037]

[0038] Compared to existing RTK applications: Traditional RTK is only used for topographic mapping and does not integrate with BIM. This invention enables real-time correction between construction data and design models, achieving a digital twin fidelity of 98.6% (average of 3 projects).

[0039] Phase 4: Monitoring Activation and Establishment of Health Baselines

[0040] After cable laying and backfilling are completed, the fiber optic host is immediately connected to activate the pre-buried distributed fiber optic sensing system. Before the cable is officially put into operation (e.g., within 72 hours before commissioning), the system continuously collects various status parameters (temperature distribution, micro-strain, etc.) to form the cable's initial "health baseline." During future operation, if any data deviates from this baseline, the system will automatically alarm and accurately locate the source, enabling predictive maintenance.

[0041]

[0042] Compared with existing monitoring systems: Traditional online monitoring systems are mostly added after commissioning, lacking baseline data, and can only issue alarms but not predict future events. This invention has a baseline before commissioning. Verified in three projects, it successfully provided early warnings for six faults, with an average advance warning time of 14 days, an accuracy rate of 90%, and a false alarm rate of <3%.

[0043] Example 2

[0044] according to Figure 1 As shown in the figure, this embodiment proposes an integrated construction method for intelligent laying and condition monitoring of highly reliable buried cables suitable for complex chemical plant areas, taking the laying of a 10kV cross-linked polyethylene insulated armored buried power supply cable with a length of 860 meters in a chemical project as an example.

[0045] Project challenges: The project is 860 meters long, passes through the old plant area, lacks information on underground pipelines, and has highly corrosive soil.

[0046] Implementation process:

[0047] Preparation: By comparing the BIM model, three old buried pipes that were not on the drawings were found. They were rerouted in advance, avoiding the accident of being dug up (saving the time to stop work and claim compensation).

[0048] Laying: according to Figure 1 Construction. Special note: At the cable joint, the optical fiber is also pre-bent (coiled for 50cm) to prevent breakage.

[0049] Data collection: While the cable was being laid, the surveyor followed along with the cable using an RTK scanner, recording the coordinates of the entire 860-meter section and generating an Excel spreadsheet for archiving.

[0050] Results verified: Six months after commissioning, the system alarmed that the temperature at 595 meters was abnormal. Upon inspection using coordinates, it was discovered that the waterproofing joint had leaked. The problem was easily repaired with just one small hole, and production was not affected.

[0051] Example 3

[0052] according to Figure 1As shown in the figure, this embodiment proposes an integrated construction method for intelligent laying and condition monitoring of highly reliable buried cables suitable for complex chemical plant areas. Taking a 1,200-meter-long 6kV variable frequency motor power supply cable (crossing the pipe gallery area between the plant area and the tank area) in a certain refining and chemical project as an example.

[0053] Engineering challenges: The cable needs to traverse a 400-meter stretch of corrosive backfill soil (soil pH value approximately 4.2), and must cross existing process pipelines multiple times along the way, with a minimum crossing clearance of only 0.3 meters. Traditional solutions require laying the entire cable in steel conduit, which is costly and time-consuming.

[0054] Implementation process: The route planning used a BIM model to conduct a specific collision analysis on the 400-meter corrosive section, and adjusted the cable route to pass through the nearest process pipeline at a distance of 0.45m, which not only met the safety distance requirements, but also avoided the core area of ​​the highly corrosive zone.

[0055] Protective measures: The corroded section adopts a composite protective pipe structure of "inner layer DN125 steel pipe (5mm wall thickness) + outer layer fiberglass pipe (4mm wall thickness)", with a burial depth of 1.2m as usual, and backfill with neutral fine sand. The sensor optical cable is laid simultaneously, with a spacing controlled at 8cm, and is fixed with adhesive and U-shaped clips at bends.

[0056] Data acquisition: RTK-GPS full-process tracking, with data collection every 1m at corners and crossings, and IMU recording the burial depth in real time to generate a digital twin.

[0057] Three months after commissioning, the system temperature at the mid-section of the cable (612m from the starting point) rose by 2.8℃ compared to the baseline, with a temperature rise rate of 0.42℃ / min. Excavation confirmed that the backfill soil at this location had experienced localized subsidence due to heavy rain erosion, causing deformation of the protective conduit and damage to the cable insulation. Thanks to timely early warning, no cable breakdown or tripping occurred. The fault location error was 0.5m, and excavation was completed in just 0.5 hours from the alarm. This project saved approximately 230,000 yuan in materials and construction costs compared to the traditional all-conduit installation method, without any loss of cable current carrying capacity.

[0058] Example 4

[0059] according to Figure 1 As shown in the figure, this embodiment proposes an integrated construction method for intelligent laying and status monitoring of highly reliable buried cables suitable for complex chemical plant areas. In a new material chemical project, six cables need to be laid simultaneously in a cable channel with a width of only 3.5 meters: two 10kV power supply cables, two 6kV frequency conversion motor cables, and two instrument signal cables (4-20mA), with a total length of about 320 meters.

[0060] Engineering challenges: The passageway is narrow, multiple circuits are laid adjacent to each other, and the frequency converter cables generate strong harmonic interference (the measured interference electric field strength on site is >120V / m). Under traditional laying methods, instrument signals frequently experience jumps and bit errors, seriously affecting the reliability of DCS control. In addition, the passageway is above a heavy truck road, resulting in periodic rolling vibrations.

[0061] Implementation Process and Results: The layered physical isolation process of this invention is adopted: from top to bottom, it consists of "instrument signal cable layer" (dedicated stainless steel partition) → "10kV power supply layer" → "6kV frequency converter layer". Galvanized steel plates (2mm thick) are used as partitions between layers, and the horizontal spacing between adjacent circuits is maintained at 10cm. Three independent sensing optical cables are laid simultaneously (one for each type of cable), with the optical cables closely attached to the cable and spaced 6cm apart.

[0062] After commissioning, a 72-hour baseline data acquisition was performed, during which the system recorded the initial temperature and strain fields. In the subsequent six months of operation, the system successfully issued warnings for two anomalies.

[0063] On the 43rd day, the strain at the B-phase joint of the frequency converter cable suddenly increased. The warning indicated that the grounding flat iron welding was loose. After handling, the joint was prevented from overheating and breaking.

[0064] On the 112th day, the temperature of the instrument signal fiber optic cable section was abnormal (increased by 3.5℃). After investigation, a leak in the nearby steam pipe was found and repaired in time.

[0065] Fault location verification: Mechanical fixed-point excavation, the system alarmed and displayed a position error of <0.3 meters within 18 seconds, and the positioning time was only 0.4 hours.

[0066] This invention utilizes BIM 3D collision detection and optimal path planning to output construction instruction diagrams with precise spatial coordinates. It can proactively identify and avoid underground concealed pipelines, preventing construction damage and temporary rerouting issues from the outset. This ensures a high degree of consistency between the completed and designed paths, solving the industry pain point of discrepancies between traditional as-built drawings and actual installations. The invention employs a simultaneous laying process of cables and distributed fiber optic sensing cables, precisely controlling the spacing between the optical and electrical cables, significantly improving the resolution and positioning accuracy of temperature and strain monitoring. Simultaneously, it incorporates composite protective pipes and layered physical isolation measures adapted to chemical environments, effectively resisting strong electromagnetic interference, corrosive soils, and ground subsidence, enhancing the long-term environmental adaptability and protection level of the cables. This invention uses a combination of RTK-GPS and IMU positioning technology to collect the cable's 3D coordinates and key construction parameters in real time during laying, dynamically fusing and correcting them with the BIM model to generate a digital twin, forming a high-precision, full-path digital archive. In the event of a fault, centimeter-level precise positioning can be achieved, significantly reducing the excavation area and improving fault location efficiency. This invention establishes a multi-dimensional health baseline before cable commissioning, enabling precise determination of abnormal deviations based on baseline data. It can identify early potential problems such as water ingress into cable joints, overload overheating, and external deformation, transforming traditional reactive repairs into predictive proactive maintenance. This results in high accuracy in fault warnings, effectively preventing unplanned downtime and secondary losses. Furthermore, this invention constructs an integrated construction system encompassing four stages: BIM planning, high-standard laying, data acquisition, and monitoring activation. It deeply integrates path design, on-site construction, digital documentation, and status monitoring, spanning the entire lifecycle of cable construction and maintenance. This reduces the overall costs associated with rework, fault repair, and production downtime, comprehensively improving the overall reliability of power supply systems in chemical enterprises.

[0067] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A construction method for intelligent laying and condition monitoring of high-reliability buried cables suitable for complex chemical plant areas, characterized in that, Includes the following steps: S1. BIM-based intelligent laying path planning: Import all underground pipe networks and structures in the construction area into the BIM model, carry out three-dimensional collision detection and optimal path planning, and generate a digital construction handover map with spatial coordinates by taking into account cable bending radius, safety distance and obstacle avoidance requirements. S2. Standardized laying operation: Cable laying shall be carried out in accordance with the digital handover diagram, and distributed optical fiber sensing cables shall be laid simultaneously in the adjacent position of the cable, and anti-interference physical isolation and high protection level protection measures shall be implemented simultaneously. S3. Real-time data acquisition and digital twin construction: During the laying process, RTK-GPS and IMU combined positioning equipment are used to collect the actual three-dimensional coordinates, burial depth and bending angle parameters of the cable at set intervals. The data is uploaded to the cloud and dynamically fused and corrected with the BIM model to generate a digital twin of the corresponding physical cable. S4. Monitoring Activation and Health Baseline Establishment: After the cable laying and backfilling are completed, the fiber optic sensing system host is connected to continuously collect status parameters before formal commissioning to form the initial health baseline of the cable, which is used for subsequent abnormal operation judgment and predictive maintenance.

2. The integrated construction method for intelligent laying and condition monitoring of high-reliability buried cables suitable for complex chemical plant areas, as described in claim 1, is characterized in that: S1 specifically involves: importing all information on underground structures such as process pipelines, water supply and drainage pipelines, and structural foundations within the construction area into the BIM model, and using the 3D collision detection function to identify all path conflict points. The route planning process comprehensively considers multiple constraints, including the minimum bending radius of the cable, the safe distance between cables of different voltage levels, avoidance of strong electromagnetic interference sources, and avoidance of corrosive soil areas. It automatically solves the global optimal laying path and outputs a construction instruction diagram with XYZ three-dimensional spatial coordinates to guide precise excavation and laying operations on site.

3. The integrated construction method for intelligent laying and condition monitoring of high-reliability buried cables suitable for complex chemical plant areas, as described in claim 1, is characterized in that: In S2, the specific process for cable laying is as follows: the sensing optical cable is arranged closely adjacent to the cable along the entire length of the cable, wherein the horizontal distance between the optical cable and the cable is controlled at 5~10cm, and the optical cable is arranged close to the top of the cable in the vertical direction, with the vertical distance controlled at 0~5cm.

4. The integrated construction method for intelligent laying and condition monitoring of high-reliability buried cables suitable for complex chemical plant areas, as described in claim 3, is characterized in that: The following parameters are used for fixing and coiling the sensor optical cable: Straight sections with a laying length of less than 500m are fixed with cable ties at 1m intervals; Road sections and bends with a laying length of more than 1km are fixed with adhesive U-shaped clips at 0.5m intervals; The optical cable is coiled at the cable joint with a coiling radius of not less than 30cm and a coiling length of not less than 50cm.

5. The integrated construction method for intelligent laying and condition monitoring of high-reliability buried cables suitable for complex chemical plant areas, as described in claim 4, is characterized in that: In S2, the high-level protection measures are as follows: when the cable crosses roads, pipe corridors, or other heavy-load or easily settled areas, a composite protective pipe structure is adopted, with an inner layer of DN150 steel pipe with a wall thickness of 6mm and an outer layer of fiberglass pipe with a wall thickness of 4mm. The overall burial depth of the protective pipe is not less than 1.2m. When the cable crosses areas with highly corrosive soil, the corresponding section adopts a composite structure of DN125 steel pipe with an inner wall thickness of 5mm and an outer layer of fiberglass pipe with a wall thickness of 4mm to increase the burial depth. Neutral fine sand is used for backfilling to jointly resist soil corrosion, ground settlement, and heavy-load rolling.

6. The integrated construction method for intelligent laying and condition monitoring of high-reliability buried cables suitable for complex chemical plant areas, as described in claim 1, is characterized in that: In S3, the specific scheme for RTK-GPS and IMU combined positioning and acquisition is as follows: one RTK-GPS base station is set up at each of the four corners of the construction area, and the network RTK mode is adopted; a coordinate point is collected every 5m along the cable laying path, and the density is increased to one point every 1m at corners, cable joints and pipe crossings; a high-precision MEMS inertial measurement unit is used to calculate the pitch angle and roll angle in real time, and the burial depth is calculated in combination with the traction length, while the traction tension and bending angle parameters are recorded simultaneously.

7. The integrated construction method for intelligent laying and condition monitoring of high-reliability buried cables suitable for complex chemical plant areas, as described in claim 6, is characterized in that: In S3, the digital twin construction process is as follows: the real-time coordinates and construction parameters obtained are uploaded to the cloud at a frequency of 1Hz via a 4G / 5G private network, with a transmission delay of less than 200ms; the BIM fusion algorithm is used to optimally match and fuse the actual path collected in real time by the IMU with the BIM design path, and an alarm is automatically triggered when the deviation between the actual path and the design path is greater than 5cm; after dynamic correction, a high-fidelity digital twin that completely corresponds to the physical cable spatial position and parameters is generated as a digital archive of the cable's entire life cycle.

8. The integrated construction method for intelligent laying and condition monitoring of high-reliability buried cables suitable for complex chemical plant areas, as described in claim 1, is characterized in that: In S4, the establishment of the health baseline is specifically as follows: within 24 hours after the cable laying and backfilling is completed and within 72 hours before formal commissioning, the fiber optic sensing system is started and the cable status parameters are collected continuously for 72 hours; the sampling frequency is set as follows: temperature parameters are collected once every 10 seconds, micro-strain parameters are collected once every 30 seconds, and partial discharge parameters are collected once per minute; after the collection is completed, a multi-dimensional initial health baseline including temperature distribution curve, micro-strain distribution curve, and partial discharge background noise spectrum is generated.

9. The integrated construction method for intelligent laying and condition monitoring of high-reliability buried cables suitable for complex chemical plant areas, as described in claim 8, is characterized in that: In S4, the operation anomaly judgment and predictive maintenance are as follows: During operation, when the temperature at any point of the cable exceeds the baseline ±3σ range, or the single-point temperature rise rate is greater than 0.5℃ / min, the system automatically triggers an alarm and accurately locates the abnormal position; the health baseline adopts a strategy of combining periodic updates and forced updates. After commissioning, the baseline is automatically updated once a quarter, and the baseline data of the corresponding section is forcibly updated within 48 hours after the cable anomaly is repaired.

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