UWB Signal Pipe Survey for Soil Void Detection
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Solution Overview
Problem
Current subsurface pipeline inspection methods, such as manual access and remote-controlled CCTV, fail to detect defects in the surrounding soil, posing safety risks and lacking productivity due to their limitations in detecting voids and foreign objects, which can lead to catastrophic subsidence like sinkholes.
Innovation Solution
A method utilizing ultra-wideband (UWB) signals transmitted by a transmitter/receiver unit positioned within the pipeline to identify the interface between soil and conduit, allowing for the detection of voids and defects in the surrounding soil by processing reflections from the conduit inner wall and soil/conduit interfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual access inspection is used, then surface defects in pipe walls can be detected, but information on defects in surrounding soils cannot be obtained and safety risks increase
Solution Approach 1:
The patent replaces manual mechanical inspection with an automated electromagnetic detection system. A transmitter/receiver unit equipped with antennas transmits electromagnetic signals through the pipe wall to detect both internal pipe defects and external soil voids, eliminating the need for manual entry while expanding detection capabilities to include subsurface conditions.
Solution Approach 2:
The inspection system performs multiple functions simultaneously: it detects surface defects on pipe walls, identifies voids in surrounding soil, and locates foreign objects. This multi-functional approach is achieved by using electromagnetic signal transmission and reception to probe both the pipe structure and the surrounding medium, resolving the contradiction between limited detection scope and safety requirements.
2Reliability
If remote controlled CCTV is used, then inspection safety improves, but detection of soil defects and productivity remain limited
Solution Approach 1:
The patent replaces optical-based CCTV inspection with electromagnetic signal-based detection. The transmitter/receiver unit uses electromagnetic waves to penetrate the pipe wall and surrounding soil, enabling detection of subsurface voids and foreign objects that CCTV cannot detect, thereby improving both safety and inspection efficiency.
Solution Approach 2:
The system simultaneously inspects multiple targets (pipe wall defects, soil voids, foreign objects) in a single operation, significantly improving productivity compared to CCTV which is limited to visual inspection of the pipe interior. The electromagnetic detection method provides comprehensive subsurface evaluation without requiring manual entry or complex multiple-pass inspection procedures.
3Measurement precision
If GPR or seismic methods are used to detect soil defects, then detection capability improves, but equipment complexity and costs increase
Solution Approach 1:
The patent employs electromagnetic signal transmission and reception instead of complex GPR or seismic equipment. The transmitter/receiver unit with antennas sends electromagnetic signals through the pipe wall and surrounding soil, and the receiver processes the reflected signals to detect voids and foreign objects, providing simplified equipment with effective soil defect detection capability.
Solution Approach 2:
The pipe wall itself serves as an intermediary medium that allows electromagnetic signals to pass through and interact with the surrounding soil. This eliminates the need for direct contact with the soil or complex external scanning equipment, simplifying the overall system while maintaining effective detection capability for subsurface defects.
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 safe and efficient detection of subsurface defects, reducing the risk of sinkholes by providing detailed information about the soil and conduit conditions, improving productivity and reducing costs compared to existing methods.
Implementation Method 1
The GPR systems normally consist of a transmitting antenna emitting electromagnetic radiation, a receiving antenna and an energy detecting device, or receiver. A portion of the transmitted signal is intercepted by a reflecting object, such as the wall of the pipeline, and is reradiated in all directions.
Implementation Method 2
A portion of the transmitted signal is intercepted by a reflecting object, such as the wall of the pipeline, and is reradiated in all directions. The energy reradiated in the back direction is collected by the receiving antenna
Data Source
AI summary
A method of surveying the condition of an underground enclosure including the steps of: (a) positioning at least one transmitter/receiver unit (including an antenna) within an underground, substantially nonconductive enclosure, such that a substantial air gap exists between the antenna and the inner wall of the enclosure; (b) transmitting an ultra wideband (UWB) signal toward at least a portion of the inner wall; and (c) processing the return signal in order to identify the interface between the soil and a region of conductivity different from the soil.