Measurement of existing operational stress using slit stress relief method with optical full-field measurement.
This technology is a method for measuring the existing stress (strain) in concrete with high precision. It has received significant attention as a survey technique for the current condition investigation of PC bridges, and it was awarded the 18th National Land Technology Development Award. By using an optical full-field measurement method, it enables high-precision strain distribution measurements even in the micro-regions near the slit. 【Features】 ■ Measurement of the area around the slit before and after cutting using a line sensor scanner type full-field strain measurement device. ■ Inverse analysis using FEM analysis allows for the estimation of the existing stress in concrete members based on the measured released strain distribution. ■ In PC structures, it is possible to estimate the amount of prestress from the existing action stress. ■ It can also be used as documentation for the restoration design of PC bridges. *For more details, please download the PDF or contact us.
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【Procedure】 ■1. Identify measurement location using rebar detection ■2. Flatten the strain measurement location, clean with a cleaning solution (such as acetone), and apply markings for image acquisition ■3. Mark the position for slit cutting ■4. Measure the concrete surface before stress release using an optical full-field measurement device (initial image) ■5. Cut a slit with a concrete cutter in a direction perpendicular to the stress application direction ■6. Again, measure the concrete surface after stress release using the optical full-field measurement device (post-deformation image) *For more details, please download the PDF or contact us.
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Our company is a unique measurement technology service provider that possesses numerous industry-leading technologies. With information-based construction as our core technology, we are a trusted consultant in the industry, holding essential technologies for the construction and maintenance management of structures and infrastructure. We confidently engage in attractive work that contributes to the development of society. ■ Installation: Installation of various measuring instruments and construction of optimal systems. ■ Measurement: Real-time and full-time measurement management, remote monitoring, and alarm output. ■ Analysis: Comprehensive consulting from data analysis and predictive analysis to technical judgment. ■ Processes: Ground support excavation work, construction involving close proximity work, cut slope management, JR track monitoring, embankment filling, shield construction, deformation management of various structures, various load tests, etc.