Portable In-Situ Gas Pressure Measuring Device for Shallow Strata
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Solution Overview
Problem
Current geotechnical engineering investigations in areas with shallow gas-bearing strata lack a portable device for measuring in-situ gas pressure, posing challenges for accurately evaluating the risk of shallow gas geological disasters during construction projects.
Innovation Solution
A portable in-situ gas pressure measuring device and method, comprising a gas collection part with a conical head, porous metal tube, cylindrical permeable stone, and sealing rubber gasket, connected to a gas pressure measuring part with a film sensor and mineral oil, integrated with a static cone penetrometer and pressure-sensor control system, allowing for on-site measurement of gas pressure in shallow gas-bearing strata.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional in-situ static cone penetration or drilling methods are used to measure gas pressure, then measurement reliability is improved, but device portability and ease of operation deteriorate
Solution Approach 1:
The measuring device is divided into separate modular components: a cone penetration rod with gas collection chambers, a porous stone filter, a rubber membrane separator, and a pressure sensor. This segmentation allows each component to perform its specific function while maintaining overall portability and ease of assembly/disassembly for field operations
Solution Approach 2:
The cone penetration rod serves multiple functions: it penetrates the soil layer, collects gas samples in its chambers, filters them through the porous stone, separates them using the rubber membrane, and transmits pressure to the sensor. This multi-functionality consolidates what would traditionally require separate specialized equipment into a single portable unit
2Measurement precision
If professional petroleum and natural gas department equipment is used, then measurement precision is improved, but device complexity and ease of manufacture deteriorate
Solution Approach 1:
A rubber membrane is introduced as an intermediary element between the gas collection chamber and the pressure sensor. This membrane selectively transmits pressure while blocking gas molecules, enabling precise pressure measurement without requiring complex gas-tight seals or sophisticated gas handling systems
Solution Approach 2:
A porous stone is used as a filter medium to separate gas from soil particles and water. The porous structure allows gas molecules to pass through while blocking larger particles, simplifying the filtration function compared to using complex membrane filters or centrifugal separation systems
3Ease of operation
If portable equipment is designed for field use, then ease of operation is improved, but measurement reliability may deteriorate
Solution Approach 1:
The device is pre-assembled with all necessary components (cone rod, porous stone, rubber membrane, sensor) in a compact configuration that maintains measurement reliability. The preliminary assembly ensures proper connections and sealing are pre-established, so that field operations only require simple insertion and activation without complex assembly procedures
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
The device provides a simple, portable, and easy-to-assemble solution for measuring gas pressure in shallow gas-bearing strata, enabling accurate assessment of gas pressure in situ, thereby mitigating the risk of shallow gas geological disasters during construction.
Implementation Method 1
a porous metal tube, a cylindrical permeable stone... the circular apertures are communicated with an inner cavity of the gas pressure measuring part through the hollow porous metal tube
Implementation Method 2
a porous metal tube... side wall of the porous metal tube is provided with circular apertures penetrating through the side wall
Implementation Method 3
a sealing rubber gasket... arranged between a top of the cylindrical permeable stone and the gas pressure measuring part
Implementation Method 4
a film sensor... arranged in the inner cavity of the sealed rubber bag and is immersed in the mineral oil
Implementation Method 5
the inner cavity of the sealed rubber bag is filled with mineral oil... the pressure is uniformly transmitted to the film pressure sensor via the mineral oil
Data Source
AI summary
The disclosure relates to the field of geotechnical engineering investigation in the civil engineering field. A portable in-situ gas pressure measuring device for a shallow gas-bearing stratum and a measuring method thereof are provided, the device includes a static cone penetrometer, a pressure-sensor control system, a static cone penetration rod and a probe. The static cone penetrometer is connected with the static cone penetration rod, the static cone penetration rod is connected with the probe; the probe is connected with the pressure-sensor control system. The portable in-situ pressure measuring device for a shallow gas-bearing stratum has simple structure and clear principle and is conveniently assembled and disassembled and easy to popularize and provides a measuring method.