Buried Cable Integrity Assessment for Hydraulic Core Extraction
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Solution Overview
Problem
Hydraulic extraction of coaxial cable cores for fiber replacement is hindered by the inability to assess the suitability of buried cables for reuse due to hidden damage such as kinks, cracks, and corrosion, which complicates troubleshooting and increases costs.
Innovation Solution
Implementing proactive network maintenance techniques and metrically based analysis using leakage detection, equalization coefficients, time domain reflection, and wireless sensors to assess the physical and signaling characteristics of buried cables, identifying integrity issues before extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hydraulic extraction is performed on buried cables without prior inspection, then the process can proceed without uncovering the cable, but hidden damage such as kinks, cracks, and corrosion cannot be detected, leading to extraction failures and costly repairs
Solution Approach 1:
The patent applies preliminary action by performing non-intrusive cable assessments using acoustic sensing and time-domain reflection techniques before initiating hydraulic extraction. This allows detection of hidden damage (kinks, cracks, corrosion) and identification of suitable extraction zones in advance, ensuring extraction success without requiring prior cable uncovering or physical inspection.
Solution Approach 2:
The patent replaces mechanical inspection methods (which would require uncovering the cable) with acoustic and electromagnetic sensing techniques. Acoustic sensors detect vibrations from hydraulic fluid movement to identify cable integrity issues, while time-domain reflection uses electrical signals to map cable characteristics, both allowing assessment without physical access to the buried cable.
2Reliability
If the cable is uncovered for visual and physical inspection, then hidden damage can be detected, but the process becomes time-consuming and expensive
Solution Approach 1:
The patent replaces mechanical inspection (uncovering and physical examination) with remote sensing techniques. Acoustic sensors mounted on the cable surface detect internal structural issues through vibration analysis, while time-domain reflection instruments send electrical pulses to identify impedance changes indicating damage, both providing accurate assessment without exposing the cable.
Solution Approach 2:
The patent introduces acoustic waves and electrical signals as intermediaries to probe cable integrity. These waves propagate through or along the cable, interacting with internal structures to reveal hidden damage, serving as a non-intrusive mediator between the inspection system and the buried cable.
3Productivity
If hydraulic extraction is attempted on damaged cables, then the extraction process can begin, but troubleshooting and fixing issues becomes costly and challenging once extraction has started
Solution Approach 1:
The patent performs preliminary diagnostic assessment using acoustic and time-domain reflection methods to identify and locate cable damage before extraction begins. This allows operators to select appropriate extraction zones, prepare remediation strategies in advance, and avoid costly troubleshooting during the extraction process itself.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate pre-extraction assessment of cable suitability, reducing costly repairs and ensuring successful hydraulic core extraction by identifying and addressing issues like corrosion, bends, and fluid leakage, thus optimizing the reuse of existing infrastructure.
Implementation Method 1
The core extraction process may rely on the hydraulic injection at high pressure of a lubricating liquid or soap between the outer shield and the core.
Implementation Method 2
acoustic sensors that detect vibrations or acoustic signals from the cable
Implementation Method 3
time domain reflection, and wireless sensors to assess the physical and signaling characteristics
Data Source
AI summary
Generating an assessment of the suitability of cables, ducts, tubes, pipes and/or other hollow-type of conduits to extraction of cores, conductors, insulation, etc. included therein while still buried in the ground or otherwise positioned out-of-sight so as to be unavailable for visual and/or physical inspection is contemplated. The assessment may be used to indicate a suitability of a cable buried in the ground of a hybrid fiber coaxial (HFC) cable plant to extraction of the type whereby a core of the cable may be extracted using hydraulics while still buried.