Understanding the preceding subsidence ahead of the cutting edge, enhancing collapse prevention and the advancement of A measurement.
**Overview** When excavating unstable ground such as loose soil or poor-quality rock (like fractured zones), there is a risk of the face becoming unstable and collapsing. This is believed to be caused by insufficient strength of the ground, posing dangers not only to workers but also potentially causing significant impacts to third parties, such as surface subsidence. The advanced ground subsidence gauge installs measuring instruments within long steel pipe supports to measure subsidence in front of the face at 50 cm intervals, continuously monitoring shear strain and pre-displacement of the ground, which are precursors to collapse. It detects face collapse through real-time, high-precision measurements and is equipped with an alarm system. **Features** The SAA is very slim and has flexible joints, making it easy to insert into long steel pipe supports for displacement measurement. By using a dedicated measurement guide pipe installed within the steel pipe during insertion, it allows for repeated use, thereby reducing measurement costs. Measurement does not require a multi-channel data logger; it can be conducted directly via a dedicated interface to a PC, resulting in a simple system configuration that easily accommodates multiple connections. *For more details, please refer to the PDF document or feel free to contact us.*
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**Benefits of Introduction** - By measuring the preceding subsidence at 50 cm intervals, we can monitor the shear strain of the ground in real time, allowing for the early detection of signs of face collapse. - Measurement values are continuously recorded on a computer, and if they exceed management standards, alarms and warning lights alert workers near the face, while automatic notifications are sent to the construction office and responsible personnel. - By understanding the preceding displacement in front of the face, we can determine the presence of plastic deformation from the shear strain within the ground. - Since we can grasp the preceding displacement rate (displacement before reaching the face / total displacement), we can set management standards that are suitable for the ground conditions. *For more details, please refer to the PDF materials or feel free to contact us.*
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**Measurement Principle** The measurement is conducted using a "3D underground displacement meter (SAA)." The SAA is a very small measuring device with a diameter of φ25mm that incorporates a MEMS gravity acceleration sensor. It is composed of segments (joints) connected at intervals of 50cm, and each segment can be bent up to 60 degrees by flexible joints. The displacement measurement calculates the segment's inclination angle to derive the interval displacement, which is then integrated from a fixed point (either the deepest or shallowest point) to obtain the overall shape of the sensor as coordinate values. *For more details, please refer to the PDF document or feel free to contact us.*
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Ensan Koubou Co., Ltd. has been providing "IT Construction" primarily in the fields of construction and agriculture. "IT Construction" refers to the technology that enables the integration, accumulation, and processing of various data through the introduction of IT (information technology) and communication technology, aiming to rationalize and enhance precision in various business scenarios. Ensan Koubou has significant achievements and high-level technology, particularly in tunnel construction, utilizing various communication technologies for automated measurement and construction management systems. Additionally, their long-standing expertise and experience are applied in building databases for plant factories, analyzing and interpreting actual measurement data, and conducting predictive simulations.
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